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Commit | Line | Data |
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95fc7512 | 1 | #include "cache.h" |
85023577 | 2 | #include "refs.h" |
cf0adba7 JH |
3 | #include "object.h" |
4 | #include "tag.h" | |
7155b727 | 5 | #include "dir.h" |
daebaa78 | 6 | #include "string-list.h" |
95fc7512 | 7 | |
bc5fd6d3 | 8 | /* |
dde8a902 | 9 | * How to handle various characters in refnames: |
745224e0 DT |
10 | * This table is used by both the SIMD and non-SIMD code. It has |
11 | * some cases that are only useful for the SIMD; these are handled | |
12 | * equivalently to the listed disposition in the non-SIMD code. | |
dde8a902 | 13 | * 0: An acceptable character for refs |
745224e0 DT |
14 | * 1: @, look for a following { to reject @{ in refs (SIMD or = 0) |
15 | * 2: \0: End-of-component and string | |
16 | * 3: /: End-of-component (SIMD or = 2) | |
17 | * 4: ., look for a preceding . to reject .. in refs | |
18 | * 5: {, look for a preceding @ to reject @{ in refs | |
19 | * 6: *, usually a bad character except, once as a wildcard (SIMD or = 7) | |
20 | * 7: A bad character except * (see check_refname_component below) | |
dde8a902 DT |
21 | */ |
22 | static unsigned char refname_disposition[256] = { | |
745224e0 DT |
23 | 2, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, |
24 | 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, | |
25 | 7, 0, 0, 0, 0, 0, 0, 0, 0, 0, 6, 0, 0, 0, 4, 3, | |
26 | 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 7, 0, 0, 0, 0, 7, | |
27 | 1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, | |
28 | 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 7, 7, 0, 7, 0, | |
dde8a902 | 29 | 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, |
745224e0 | 30 | 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 5, 0, 0, 7, 7 |
dde8a902 DT |
31 | }; |
32 | ||
33 | /* | |
34 | * Try to read one refname component from the front of refname. | |
35 | * Return the length of the component found, or -1 if the component is | |
36 | * not legal. It is legal if it is something reasonable to have under | |
37 | * ".git/refs/"; We do not like it if: | |
bc5fd6d3 MH |
38 | * |
39 | * - any path component of it begins with ".", or | |
40 | * - it has double dots "..", or | |
41 | * - it has ASCII control character, "~", "^", ":" or SP, anywhere, or | |
745224e0 DT |
42 | * - it has pattern-matching notation "*", "?", "[", anywhere, or |
43 | * - it ends with a "/", or | |
44 | * - it ends with ".lock", or | |
bc5fd6d3 MH |
45 | * - it contains a "\" (backslash) |
46 | */ | |
bc5fd6d3 MH |
47 | static int check_refname_component(const char *refname, int flags) |
48 | { | |
49 | const char *cp; | |
50 | char last = '\0'; | |
51 | ||
52 | for (cp = refname; ; cp++) { | |
dde8a902 DT |
53 | int ch = *cp & 255; |
54 | unsigned char disp = refname_disposition[ch]; | |
55 | switch (disp) { | |
745224e0 DT |
56 | case 2: /* fall-through */ |
57 | case 3: | |
dde8a902 | 58 | goto out; |
745224e0 | 59 | case 4: |
dde8a902 DT |
60 | if (last == '.') |
61 | return -1; /* Refname contains "..". */ | |
62 | break; | |
745224e0 | 63 | case 5: |
dde8a902 DT |
64 | if (last == '@') |
65 | return -1; /* Refname contains "@{". */ | |
bc5fd6d3 | 66 | break; |
745224e0 DT |
67 | case 6: /* fall-through */ |
68 | case 7: | |
dde8a902 DT |
69 | return -1; |
70 | } | |
bc5fd6d3 MH |
71 | last = ch; |
72 | } | |
dde8a902 | 73 | out: |
bc5fd6d3 | 74 | if (cp == refname) |
dac529e4 | 75 | return 0; /* Component has zero length. */ |
bc5fd6d3 MH |
76 | if (refname[0] == '.') { |
77 | if (!(flags & REFNAME_DOT_COMPONENT)) | |
78 | return -1; /* Component starts with '.'. */ | |
79 | /* | |
80 | * Even if leading dots are allowed, don't allow "." | |
81 | * as a component (".." is prevented by a rule above). | |
82 | */ | |
83 | if (refname[1] == '\0') | |
84 | return -1; /* Component equals ".". */ | |
85 | } | |
86 | if (cp - refname >= 5 && !memcmp(cp - 5, ".lock", 5)) | |
87 | return -1; /* Refname ends with ".lock". */ | |
88 | return cp - refname; | |
89 | } | |
90 | ||
745224e0 | 91 | static int check_refname_format_bytewise(const char *refname, int flags) |
bc5fd6d3 MH |
92 | { |
93 | int component_len, component_count = 0; | |
94 | ||
9ba89f48 FC |
95 | if (!strcmp(refname, "@")) |
96 | /* Refname is a single character '@'. */ | |
97 | return -1; | |
98 | ||
bc5fd6d3 MH |
99 | while (1) { |
100 | /* We are at the start of a path component. */ | |
101 | component_len = check_refname_component(refname, flags); | |
dac529e4 | 102 | if (component_len <= 0) { |
bc5fd6d3 MH |
103 | if ((flags & REFNAME_REFSPEC_PATTERN) && |
104 | refname[0] == '*' && | |
105 | (refname[1] == '\0' || refname[1] == '/')) { | |
106 | /* Accept one wildcard as a full refname component. */ | |
107 | flags &= ~REFNAME_REFSPEC_PATTERN; | |
108 | component_len = 1; | |
109 | } else { | |
110 | return -1; | |
111 | } | |
112 | } | |
113 | component_count++; | |
114 | if (refname[component_len] == '\0') | |
115 | break; | |
116 | /* Skip to next component. */ | |
117 | refname += component_len + 1; | |
118 | } | |
119 | ||
120 | if (refname[component_len - 1] == '.') | |
121 | return -1; /* Refname ends with '.'. */ | |
122 | if (!(flags & REFNAME_ALLOW_ONELEVEL) && component_count < 2) | |
123 | return -1; /* Refname has only one component. */ | |
124 | return 0; | |
125 | } | |
126 | ||
745224e0 DT |
127 | #if defined(__GNUC__) && defined(__x86_64__) |
128 | #define SSE_VECTOR_BYTES 16 | |
129 | ||
130 | /* Vectorized version of check_refname_format. */ | |
131 | int check_refname_format(const char *refname, int flags) | |
132 | { | |
133 | const char *cp = refname; | |
134 | ||
135 | const __m128i dot = _mm_set1_epi8('.'); | |
136 | const __m128i at = _mm_set1_epi8('@'); | |
137 | const __m128i curly = _mm_set1_epi8('{'); | |
138 | const __m128i slash = _mm_set1_epi8('/'); | |
139 | const __m128i zero = _mm_set1_epi8('\000'); | |
140 | const __m128i el = _mm_set1_epi8('l'); | |
141 | ||
142 | /* below '*', all characters are forbidden or rare */ | |
143 | const __m128i star_ub = _mm_set1_epi8('*' + 1); | |
144 | ||
145 | const __m128i colon = _mm_set1_epi8(':'); | |
146 | const __m128i question = _mm_set1_epi8('?'); | |
147 | ||
148 | /* '['..'^' contains 4 characters: 3 forbidden and 1 rare */ | |
149 | const __m128i bracket_lb = _mm_set1_epi8('[' - 1); | |
150 | const __m128i caret_ub = _mm_set1_epi8('^' + 1); | |
151 | ||
152 | /* '~' and above are forbidden */ | |
153 | const __m128i tilde_lb = _mm_set1_epi8('~' - 1); | |
154 | ||
155 | int component_count = 0; | |
6d17dc1d | 156 | int orig_flags = flags; |
745224e0 DT |
157 | |
158 | if (refname[0] == 0 || refname[0] == '/') { | |
159 | /* entirely empty ref or initial ref component */ | |
160 | return -1; | |
161 | } | |
162 | ||
163 | /* | |
164 | * Initial ref component of '.'; below we look for /. so we'll | |
165 | * miss this. | |
166 | */ | |
167 | if (refname[0] == '.') { | |
168 | if (refname[1] == '/' || refname[1] == '\0') | |
169 | return -1; | |
170 | if (!(flags & REFNAME_DOT_COMPONENT)) | |
171 | return -1; | |
172 | } | |
173 | while(1) { | |
174 | __m128i tmp, tmp1, result; | |
175 | uint64_t mask; | |
176 | ||
177 | if ((uintptr_t) cp % PAGE_SIZE > PAGE_SIZE - SSE_VECTOR_BYTES - 1) | |
178 | /* | |
179 | * End-of-page; fall back to slow method for | |
180 | * this entire ref. | |
181 | */ | |
6d17dc1d | 182 | return check_refname_format_bytewise(refname, orig_flags); |
745224e0 DT |
183 | |
184 | tmp = _mm_loadu_si128((__m128i *)cp); | |
185 | tmp1 = _mm_loadu_si128((__m128i *)(cp + 1)); | |
186 | ||
187 | /* | |
188 | * This range (note the lt) contains some | |
189 | * permissible-but-rare characters (including all | |
190 | * characters >= 128), which we handle later. It also | |
191 | * includes \000. | |
192 | */ | |
193 | result = _mm_cmplt_epi8(tmp, star_ub); | |
194 | ||
195 | result = _mm_or_si128(result, _mm_cmpeq_epi8(tmp, question)); | |
196 | result = _mm_or_si128(result, _mm_cmpeq_epi8(tmp, colon)); | |
197 | ||
198 | /* This range contains the permissible ] as bycatch */ | |
199 | result = _mm_or_si128(result, _mm_and_si128( | |
200 | _mm_cmpgt_epi8(tmp, bracket_lb), | |
201 | _mm_cmplt_epi8(tmp, caret_ub))); | |
202 | ||
203 | result = _mm_or_si128(result, _mm_cmpgt_epi8(tmp, tilde_lb)); | |
204 | ||
205 | /* .. */ | |
206 | result = _mm_or_si128(result, _mm_and_si128( | |
207 | _mm_cmpeq_epi8(tmp, dot), | |
208 | _mm_cmpeq_epi8(tmp1, dot))); | |
209 | /* @{ */ | |
210 | result = _mm_or_si128(result, _mm_and_si128( | |
211 | _mm_cmpeq_epi8(tmp, at), | |
212 | _mm_cmpeq_epi8(tmp1, curly))); | |
213 | /* // */ | |
214 | result = _mm_or_si128(result, _mm_and_si128( | |
215 | _mm_cmpeq_epi8(tmp, slash), | |
216 | _mm_cmpeq_epi8(tmp1, slash))); | |
217 | /* trailing / */ | |
218 | result = _mm_or_si128(result, _mm_and_si128( | |
219 | _mm_cmpeq_epi8(tmp, slash), | |
220 | _mm_cmpeq_epi8(tmp1, zero))); | |
221 | /* .l, beginning of .lock */ | |
222 | result = _mm_or_si128(result, _mm_and_si128( | |
223 | _mm_cmpeq_epi8(tmp, dot), | |
224 | _mm_cmpeq_epi8(tmp1, el))); | |
225 | /* | |
226 | * Even though /. is not necessarily an error, we flag | |
227 | * it anyway. If we find it, we'll check if it's valid | |
228 | * and if so we'll advance just past it. | |
229 | */ | |
230 | result = _mm_or_si128(result, _mm_and_si128( | |
231 | _mm_cmpeq_epi8(tmp, slash), | |
232 | _mm_cmpeq_epi8(tmp1, dot))); | |
233 | ||
234 | mask = _mm_movemask_epi8(result); | |
235 | if (mask) { | |
236 | /* | |
237 | * We've found either end-of-string, or some | |
238 | * probably-bad character or substring. | |
239 | */ | |
240 | int i = __builtin_ctz(mask); | |
241 | switch (refname_disposition[cp[i] & 255]) { | |
242 | case 0: /* fall-through */ | |
243 | case 5: | |
244 | /* | |
245 | * bycatch: a good character that's in | |
246 | * one of the ranges of mostly-forbidden | |
247 | * characters | |
248 | */ | |
249 | cp += i + 1; | |
250 | break; | |
251 | case 1: | |
252 | if (cp[i + 1] == '{') | |
253 | return -1; | |
254 | cp += i + 1; | |
255 | break; | |
256 | case 2: | |
257 | if (!(flags & REFNAME_ALLOW_ONELEVEL) | |
258 | && !component_count && !strchr(refname, '/')) | |
259 | /* Refname has only one component. */ | |
260 | return -1; | |
261 | return 0; | |
262 | case 3: | |
263 | component_count ++; | |
264 | /* | |
265 | * Even if leading dots are allowed, don't | |
266 | * allow "." as a component (".." is | |
267 | * prevented by case 4 below). | |
268 | */ | |
269 | if (cp[i + 1] == '.') { | |
270 | if (cp[i + 2] == '\0') | |
271 | return -1; | |
272 | if (flags & REFNAME_DOT_COMPONENT) { | |
273 | /* skip to just after the /. */ | |
274 | cp += i + 2; | |
275 | break; | |
276 | } | |
277 | return -1; | |
278 | } else if (cp[i + 1] == '/' || cp[i + 1] == '\0') | |
279 | return -1; | |
280 | break; | |
281 | case 4: | |
282 | if (cp[i + 1] == '.' || cp[i + 1] == '\0') | |
283 | return -1; | |
284 | /* .lock as end-of-component or end-of-string */ | |
285 | if ((!strncmp(cp + i, ".lock", 5)) | |
286 | && (cp[i + 5] == '/' || cp[i + 5] == 0)) | |
287 | return -1; | |
288 | cp += 1; | |
289 | break; | |
290 | case 6: | |
291 | if (((cp == refname + i) || cp[i - 1] == '/') | |
292 | && (cp[i + 1] == '/' || cp[i + 1] == 0)) | |
293 | if (flags & REFNAME_REFSPEC_PATTERN) { | |
294 | flags &= ~REFNAME_REFSPEC_PATTERN; | |
295 | /* restart after the * */ | |
296 | cp += i + 1; | |
297 | continue; | |
298 | } | |
299 | /* fall-through */ | |
300 | case 7: | |
301 | return -1; | |
302 | } | |
303 | } else | |
304 | cp += SSE_VECTOR_BYTES; | |
305 | } | |
306 | } | |
307 | ||
308 | #else | |
309 | ||
310 | int check_refname_format (const char *refname, int flags) | |
311 | { | |
312 | return check_refname_format_bytewise(refname, flags); | |
313 | } | |
314 | ||
315 | #endif | |
316 | ||
bc5fd6d3 | 317 | struct ref_entry; |
e1e22e37 | 318 | |
28e6a34e MH |
319 | /* |
320 | * Information used (along with the information in ref_entry) to | |
321 | * describe a single cached reference. This data structure only | |
322 | * occurs embedded in a union in struct ref_entry, and only when | |
323 | * (ref_entry->flag & REF_DIR) is zero. | |
324 | */ | |
593f1bb8 | 325 | struct ref_value { |
6c6f58df MH |
326 | /* |
327 | * The name of the object to which this reference resolves | |
328 | * (which may be a tag object). If REF_ISBROKEN, this is | |
329 | * null. If REF_ISSYMREF, then this is the name of the object | |
330 | * referred to by the last reference in the symlink chain. | |
331 | */ | |
593f1bb8 | 332 | unsigned char sha1[20]; |
6c6f58df MH |
333 | |
334 | /* | |
335 | * If REF_KNOWS_PEELED, then this field holds the peeled value | |
336 | * of this reference, or null if the reference is known not to | |
2312a793 MH |
337 | * be peelable. See the documentation for peel_ref() for an |
338 | * exact definition of "peelable". | |
6c6f58df | 339 | */ |
593f1bb8 MH |
340 | unsigned char peeled[20]; |
341 | }; | |
342 | ||
f006c42a MH |
343 | struct ref_cache; |
344 | ||
28e6a34e MH |
345 | /* |
346 | * Information used (along with the information in ref_entry) to | |
347 | * describe a level in the hierarchy of references. This data | |
348 | * structure only occurs embedded in a union in struct ref_entry, and | |
349 | * only when (ref_entry.flag & REF_DIR) is set. In that case, | |
350 | * (ref_entry.flag & REF_INCOMPLETE) determines whether the references | |
351 | * in the directory have already been read: | |
352 | * | |
353 | * (ref_entry.flag & REF_INCOMPLETE) unset -- a directory of loose | |
354 | * or packed references, already read. | |
355 | * | |
356 | * (ref_entry.flag & REF_INCOMPLETE) set -- a directory of loose | |
357 | * references that hasn't been read yet (nor has any of its | |
358 | * subdirectories). | |
359 | * | |
360 | * Entries within a directory are stored within a growable array of | |
361 | * pointers to ref_entries (entries, nr, alloc). Entries 0 <= i < | |
362 | * sorted are sorted by their component name in strcmp() order and the | |
363 | * remaining entries are unsorted. | |
364 | * | |
365 | * Loose references are read lazily, one directory at a time. When a | |
366 | * directory of loose references is read, then all of the references | |
367 | * in that directory are stored, and REF_INCOMPLETE stubs are created | |
368 | * for any subdirectories, but the subdirectories themselves are not | |
369 | * read. The reading is triggered by get_ref_dir(). | |
370 | */ | |
d3177275 | 371 | struct ref_dir { |
e9c4c111 | 372 | int nr, alloc; |
e6ed3ca6 MH |
373 | |
374 | /* | |
375 | * Entries with index 0 <= i < sorted are sorted by name. New | |
376 | * entries are appended to the list unsorted, and are sorted | |
377 | * only when required; thus we avoid the need to sort the list | |
378 | * after the addition of every reference. | |
379 | */ | |
380 | int sorted; | |
381 | ||
f006c42a MH |
382 | /* A pointer to the ref_cache that contains this ref_dir. */ |
383 | struct ref_cache *ref_cache; | |
384 | ||
d3177275 | 385 | struct ref_entry **entries; |
e9c4c111 JP |
386 | }; |
387 | ||
89df9c84 MH |
388 | /* |
389 | * Bit values for ref_entry::flag. REF_ISSYMREF=0x01, | |
390 | * REF_ISPACKED=0x02, and REF_ISBROKEN=0x04 are public values; see | |
391 | * refs.h. | |
392 | */ | |
393 | ||
394 | /* | |
395 | * The field ref_entry->u.value.peeled of this value entry contains | |
396 | * the correct peeled value for the reference, which might be | |
397 | * null_sha1 if the reference is not a tag or if it is broken. | |
398 | */ | |
432ad41e | 399 | #define REF_KNOWS_PEELED 0x08 |
28e6a34e MH |
400 | |
401 | /* ref_entry represents a directory of references */ | |
432ad41e | 402 | #define REF_DIR 0x10 |
cf0adba7 | 403 | |
28e6a34e MH |
404 | /* |
405 | * Entry has not yet been read from disk (used only for REF_DIR | |
406 | * entries representing loose references) | |
407 | */ | |
408 | #define REF_INCOMPLETE 0x20 | |
409 | ||
432ad41e MH |
410 | /* |
411 | * A ref_entry represents either a reference or a "subdirectory" of | |
28e6a34e MH |
412 | * references. |
413 | * | |
414 | * Each directory in the reference namespace is represented by a | |
415 | * ref_entry with (flags & REF_DIR) set and containing a subdir member | |
416 | * that holds the entries in that directory that have been read so | |
417 | * far. If (flags & REF_INCOMPLETE) is set, then the directory and | |
418 | * its subdirectories haven't been read yet. REF_INCOMPLETE is only | |
419 | * used for loose reference directories. | |
420 | * | |
421 | * References are represented by a ref_entry with (flags & REF_DIR) | |
422 | * unset and a value member that describes the reference's value. The | |
423 | * flag member is at the ref_entry level, but it is also needed to | |
424 | * interpret the contents of the value field (in other words, a | |
425 | * ref_value object is not very much use without the enclosing | |
426 | * ref_entry). | |
432ad41e MH |
427 | * |
428 | * Reference names cannot end with slash and directories' names are | |
429 | * always stored with a trailing slash (except for the top-level | |
430 | * directory, which is always denoted by ""). This has two nice | |
431 | * consequences: (1) when the entries in each subdir are sorted | |
432 | * lexicographically by name (as they usually are), the references in | |
433 | * a whole tree can be generated in lexicographic order by traversing | |
434 | * the tree in left-to-right, depth-first order; (2) the names of | |
435 | * references and subdirectories cannot conflict, and therefore the | |
436 | * presence of an empty subdirectory does not block the creation of a | |
437 | * similarly-named reference. (The fact that reference names with the | |
438 | * same leading components can conflict *with each other* is a | |
439 | * separate issue that is regulated by is_refname_available().) | |
440 | * | |
441 | * Please note that the name field contains the fully-qualified | |
442 | * reference (or subdirectory) name. Space could be saved by only | |
443 | * storing the relative names. But that would require the full names | |
444 | * to be generated on the fly when iterating in do_for_each_ref(), and | |
445 | * would break callback functions, who have always been able to assume | |
446 | * that the name strings that they are passed will not be freed during | |
447 | * the iteration. | |
448 | */ | |
bc5fd6d3 MH |
449 | struct ref_entry { |
450 | unsigned char flag; /* ISSYMREF? ISPACKED? */ | |
593f1bb8 | 451 | union { |
432ad41e MH |
452 | struct ref_value value; /* if not (flags&REF_DIR) */ |
453 | struct ref_dir subdir; /* if (flags&REF_DIR) */ | |
593f1bb8 | 454 | } u; |
432ad41e MH |
455 | /* |
456 | * The full name of the reference (e.g., "refs/heads/master") | |
457 | * or the full name of the directory with a trailing slash | |
458 | * (e.g., "refs/heads/"): | |
459 | */ | |
bc5fd6d3 MH |
460 | char name[FLEX_ARRAY]; |
461 | }; | |
e1e22e37 | 462 | |
28e6a34e MH |
463 | static void read_loose_refs(const char *dirname, struct ref_dir *dir); |
464 | ||
d7826d54 MH |
465 | static struct ref_dir *get_ref_dir(struct ref_entry *entry) |
466 | { | |
28e6a34e | 467 | struct ref_dir *dir; |
d7826d54 | 468 | assert(entry->flag & REF_DIR); |
28e6a34e MH |
469 | dir = &entry->u.subdir; |
470 | if (entry->flag & REF_INCOMPLETE) { | |
471 | read_loose_refs(entry->name, dir); | |
472 | entry->flag &= ~REF_INCOMPLETE; | |
473 | } | |
474 | return dir; | |
d7826d54 MH |
475 | } |
476 | ||
cddc4258 MH |
477 | static struct ref_entry *create_ref_entry(const char *refname, |
478 | const unsigned char *sha1, int flag, | |
479 | int check_name) | |
e1e22e37 LT |
480 | { |
481 | int len; | |
cddc4258 | 482 | struct ref_entry *ref; |
e1e22e37 | 483 | |
09116a1c | 484 | if (check_name && |
dfefa935 MH |
485 | check_refname_format(refname, REFNAME_ALLOW_ONELEVEL|REFNAME_DOT_COMPONENT)) |
486 | die("Reference has invalid format: '%s'", refname); | |
cddc4258 MH |
487 | len = strlen(refname) + 1; |
488 | ref = xmalloc(sizeof(struct ref_entry) + len); | |
593f1bb8 MH |
489 | hashcpy(ref->u.value.sha1, sha1); |
490 | hashclr(ref->u.value.peeled); | |
cddc4258 MH |
491 | memcpy(ref->name, refname, len); |
492 | ref->flag = flag; | |
493 | return ref; | |
494 | } | |
495 | ||
432ad41e MH |
496 | static void clear_ref_dir(struct ref_dir *dir); |
497 | ||
732134ed MH |
498 | static void free_ref_entry(struct ref_entry *entry) |
499 | { | |
27b5587c MH |
500 | if (entry->flag & REF_DIR) { |
501 | /* | |
502 | * Do not use get_ref_dir() here, as that might | |
503 | * trigger the reading of loose refs. | |
504 | */ | |
505 | clear_ref_dir(&entry->u.subdir); | |
506 | } | |
732134ed MH |
507 | free(entry); |
508 | } | |
509 | ||
432ad41e MH |
510 | /* |
511 | * Add a ref_entry to the end of dir (unsorted). Entry is always | |
512 | * stored directly in dir; no recursion into subdirectories is | |
513 | * done. | |
514 | */ | |
515 | static void add_entry_to_dir(struct ref_dir *dir, struct ref_entry *entry) | |
cddc4258 | 516 | { |
432ad41e MH |
517 | ALLOC_GROW(dir->entries, dir->nr + 1, dir->alloc); |
518 | dir->entries[dir->nr++] = entry; | |
654ad400 MH |
519 | /* optimize for the case that entries are added in order */ |
520 | if (dir->nr == 1 || | |
521 | (dir->nr == dir->sorted + 1 && | |
522 | strcmp(dir->entries[dir->nr - 2]->name, | |
523 | dir->entries[dir->nr - 1]->name) < 0)) | |
524 | dir->sorted = dir->nr; | |
c774aab9 JP |
525 | } |
526 | ||
432ad41e MH |
527 | /* |
528 | * Clear and free all entries in dir, recursively. | |
529 | */ | |
d3177275 | 530 | static void clear_ref_dir(struct ref_dir *dir) |
bc5fd6d3 MH |
531 | { |
532 | int i; | |
d3177275 MH |
533 | for (i = 0; i < dir->nr; i++) |
534 | free_ref_entry(dir->entries[i]); | |
535 | free(dir->entries); | |
536 | dir->sorted = dir->nr = dir->alloc = 0; | |
537 | dir->entries = NULL; | |
bc5fd6d3 MH |
538 | } |
539 | ||
432ad41e MH |
540 | /* |
541 | * Create a struct ref_entry object for the specified dirname. | |
542 | * dirname is the name of the directory with a trailing slash (e.g., | |
543 | * "refs/heads/") or "" for the top-level directory. | |
544 | */ | |
f006c42a | 545 | static struct ref_entry *create_dir_entry(struct ref_cache *ref_cache, |
b9146f51 RS |
546 | const char *dirname, size_t len, |
547 | int incomplete) | |
432ad41e MH |
548 | { |
549 | struct ref_entry *direntry; | |
432ad41e | 550 | direntry = xcalloc(1, sizeof(struct ref_entry) + len + 1); |
b9146f51 RS |
551 | memcpy(direntry->name, dirname, len); |
552 | direntry->name[len] = '\0'; | |
f006c42a | 553 | direntry->u.subdir.ref_cache = ref_cache; |
28e6a34e | 554 | direntry->flag = REF_DIR | (incomplete ? REF_INCOMPLETE : 0); |
432ad41e MH |
555 | return direntry; |
556 | } | |
557 | ||
e9c4c111 | 558 | static int ref_entry_cmp(const void *a, const void *b) |
c774aab9 | 559 | { |
e9c4c111 JP |
560 | struct ref_entry *one = *(struct ref_entry **)a; |
561 | struct ref_entry *two = *(struct ref_entry **)b; | |
562 | return strcmp(one->name, two->name); | |
563 | } | |
c774aab9 | 564 | |
d3177275 | 565 | static void sort_ref_dir(struct ref_dir *dir); |
bc5fd6d3 | 566 | |
e1980c9d JH |
567 | struct string_slice { |
568 | size_t len; | |
569 | const char *str; | |
570 | }; | |
571 | ||
572 | static int ref_entry_cmp_sslice(const void *key_, const void *ent_) | |
573 | { | |
c971ddfd RS |
574 | const struct string_slice *key = key_; |
575 | const struct ref_entry *ent = *(const struct ref_entry * const *)ent_; | |
576 | int cmp = strncmp(key->str, ent->name, key->len); | |
e1980c9d JH |
577 | if (cmp) |
578 | return cmp; | |
c971ddfd | 579 | return '\0' - (unsigned char)ent->name[key->len]; |
e1980c9d JH |
580 | } |
581 | ||
432ad41e | 582 | /* |
9fc0a648 MH |
583 | * Return the index of the entry with the given refname from the |
584 | * ref_dir (non-recursively), sorting dir if necessary. Return -1 if | |
585 | * no such entry is found. dir must already be complete. | |
432ad41e | 586 | */ |
9fc0a648 | 587 | static int search_ref_dir(struct ref_dir *dir, const char *refname, size_t len) |
bc5fd6d3 | 588 | { |
e1980c9d JH |
589 | struct ref_entry **r; |
590 | struct string_slice key; | |
bc5fd6d3 | 591 | |
432ad41e | 592 | if (refname == NULL || !dir->nr) |
9fc0a648 | 593 | return -1; |
bc5fd6d3 | 594 | |
d3177275 | 595 | sort_ref_dir(dir); |
e1980c9d JH |
596 | key.len = len; |
597 | key.str = refname; | |
598 | r = bsearch(&key, dir->entries, dir->nr, sizeof(*dir->entries), | |
599 | ref_entry_cmp_sslice); | |
bc5fd6d3 MH |
600 | |
601 | if (r == NULL) | |
9fc0a648 | 602 | return -1; |
bc5fd6d3 | 603 | |
9fc0a648 | 604 | return r - dir->entries; |
bc5fd6d3 MH |
605 | } |
606 | ||
f348ac92 MH |
607 | /* |
608 | * Search for a directory entry directly within dir (without | |
609 | * recursing). Sort dir if necessary. subdirname must be a directory | |
610 | * name (i.e., end in '/'). If mkdir is set, then create the | |
611 | * directory if it is missing; otherwise, return NULL if the desired | |
28e6a34e | 612 | * directory cannot be found. dir must already be complete. |
f348ac92 | 613 | */ |
3f3aa1bc | 614 | static struct ref_dir *search_for_subdir(struct ref_dir *dir, |
dd02e728 RS |
615 | const char *subdirname, size_t len, |
616 | int mkdir) | |
f348ac92 | 617 | { |
9fc0a648 MH |
618 | int entry_index = search_ref_dir(dir, subdirname, len); |
619 | struct ref_entry *entry; | |
620 | if (entry_index == -1) { | |
f348ac92 MH |
621 | if (!mkdir) |
622 | return NULL; | |
28e6a34e MH |
623 | /* |
624 | * Since dir is complete, the absence of a subdir | |
625 | * means that the subdir really doesn't exist; | |
626 | * therefore, create an empty record for it but mark | |
627 | * the record complete. | |
628 | */ | |
b9146f51 | 629 | entry = create_dir_entry(dir->ref_cache, subdirname, len, 0); |
f348ac92 | 630 | add_entry_to_dir(dir, entry); |
9fc0a648 MH |
631 | } else { |
632 | entry = dir->entries[entry_index]; | |
f348ac92 | 633 | } |
3f3aa1bc | 634 | return get_ref_dir(entry); |
f348ac92 MH |
635 | } |
636 | ||
432ad41e MH |
637 | /* |
638 | * If refname is a reference name, find the ref_dir within the dir | |
639 | * tree that should hold refname. If refname is a directory name | |
640 | * (i.e., ends in '/'), then return that ref_dir itself. dir must | |
28e6a34e MH |
641 | * represent the top-level directory and must already be complete. |
642 | * Sort ref_dirs and recurse into subdirectories as necessary. If | |
643 | * mkdir is set, then create any missing directories; otherwise, | |
644 | * return NULL if the desired directory cannot be found. | |
432ad41e MH |
645 | */ |
646 | static struct ref_dir *find_containing_dir(struct ref_dir *dir, | |
647 | const char *refname, int mkdir) | |
648 | { | |
5fa04418 | 649 | const char *slash; |
5fa04418 | 650 | for (slash = strchr(refname, '/'); slash; slash = strchr(slash + 1, '/')) { |
dd02e728 | 651 | size_t dirnamelen = slash - refname + 1; |
3f3aa1bc | 652 | struct ref_dir *subdir; |
dd02e728 | 653 | subdir = search_for_subdir(dir, refname, dirnamelen, mkdir); |
663c1295 JH |
654 | if (!subdir) { |
655 | dir = NULL; | |
f348ac92 | 656 | break; |
432ad41e | 657 | } |
3f3aa1bc | 658 | dir = subdir; |
432ad41e MH |
659 | } |
660 | ||
432ad41e MH |
661 | return dir; |
662 | } | |
663 | ||
664 | /* | |
665 | * Find the value entry with the given name in dir, sorting ref_dirs | |
666 | * and recursing into subdirectories as necessary. If the name is not | |
667 | * found or it corresponds to a directory entry, return NULL. | |
668 | */ | |
669 | static struct ref_entry *find_ref(struct ref_dir *dir, const char *refname) | |
670 | { | |
9fc0a648 | 671 | int entry_index; |
432ad41e MH |
672 | struct ref_entry *entry; |
673 | dir = find_containing_dir(dir, refname, 0); | |
674 | if (!dir) | |
675 | return NULL; | |
9fc0a648 MH |
676 | entry_index = search_ref_dir(dir, refname, strlen(refname)); |
677 | if (entry_index == -1) | |
678 | return NULL; | |
679 | entry = dir->entries[entry_index]; | |
680 | return (entry->flag & REF_DIR) ? NULL : entry; | |
432ad41e MH |
681 | } |
682 | ||
506a760d MH |
683 | /* |
684 | * Remove the entry with the given name from dir, recursing into | |
685 | * subdirectories as necessary. If refname is the name of a directory | |
686 | * (i.e., ends with '/'), then remove the directory and its contents. | |
687 | * If the removal was successful, return the number of entries | |
688 | * remaining in the directory entry that contained the deleted entry. | |
689 | * If the name was not found, return -1. Please note that this | |
690 | * function only deletes the entry from the cache; it does not delete | |
691 | * it from the filesystem or ensure that other cache entries (which | |
692 | * might be symbolic references to the removed entry) are updated. | |
693 | * Nor does it remove any containing dir entries that might be made | |
694 | * empty by the removal. dir must represent the top-level directory | |
695 | * and must already be complete. | |
696 | */ | |
697 | static int remove_entry(struct ref_dir *dir, const char *refname) | |
698 | { | |
699 | int refname_len = strlen(refname); | |
700 | int entry_index; | |
701 | struct ref_entry *entry; | |
702 | int is_dir = refname[refname_len - 1] == '/'; | |
703 | if (is_dir) { | |
704 | /* | |
705 | * refname represents a reference directory. Remove | |
706 | * the trailing slash; otherwise we will get the | |
707 | * directory *representing* refname rather than the | |
708 | * one *containing* it. | |
709 | */ | |
710 | char *dirname = xmemdupz(refname, refname_len - 1); | |
711 | dir = find_containing_dir(dir, dirname, 0); | |
712 | free(dirname); | |
713 | } else { | |
714 | dir = find_containing_dir(dir, refname, 0); | |
715 | } | |
716 | if (!dir) | |
717 | return -1; | |
718 | entry_index = search_ref_dir(dir, refname, refname_len); | |
719 | if (entry_index == -1) | |
720 | return -1; | |
721 | entry = dir->entries[entry_index]; | |
722 | ||
723 | memmove(&dir->entries[entry_index], | |
724 | &dir->entries[entry_index + 1], | |
725 | (dir->nr - entry_index - 1) * sizeof(*dir->entries) | |
726 | ); | |
727 | dir->nr--; | |
728 | if (dir->sorted > entry_index) | |
729 | dir->sorted--; | |
730 | free_ref_entry(entry); | |
731 | return dir->nr; | |
432ad41e MH |
732 | } |
733 | ||
734 | /* | |
735 | * Add a ref_entry to the ref_dir (unsorted), recursing into | |
736 | * subdirectories as necessary. dir must represent the top-level | |
737 | * directory. Return 0 on success. | |
738 | */ | |
739 | static int add_ref(struct ref_dir *dir, struct ref_entry *ref) | |
740 | { | |
741 | dir = find_containing_dir(dir, ref->name, 1); | |
742 | if (!dir) | |
743 | return -1; | |
744 | add_entry_to_dir(dir, ref); | |
745 | return 0; | |
746 | } | |
747 | ||
202a56a9 MH |
748 | /* |
749 | * Emit a warning and return true iff ref1 and ref2 have the same name | |
750 | * and the same sha1. Die if they have the same name but different | |
751 | * sha1s. | |
752 | */ | |
753 | static int is_dup_ref(const struct ref_entry *ref1, const struct ref_entry *ref2) | |
754 | { | |
432ad41e | 755 | if (strcmp(ref1->name, ref2->name)) |
202a56a9 | 756 | return 0; |
432ad41e MH |
757 | |
758 | /* Duplicate name; make sure that they don't conflict: */ | |
759 | ||
760 | if ((ref1->flag & REF_DIR) || (ref2->flag & REF_DIR)) | |
761 | /* This is impossible by construction */ | |
762 | die("Reference directory conflict: %s", ref1->name); | |
763 | ||
764 | if (hashcmp(ref1->u.value.sha1, ref2->u.value.sha1)) | |
765 | die("Duplicated ref, and SHA1s don't match: %s", ref1->name); | |
766 | ||
767 | warning("Duplicated ref: %s", ref1->name); | |
768 | return 1; | |
202a56a9 MH |
769 | } |
770 | ||
e6ed3ca6 | 771 | /* |
432ad41e MH |
772 | * Sort the entries in dir non-recursively (if they are not already |
773 | * sorted) and remove any duplicate entries. | |
e6ed3ca6 | 774 | */ |
d3177275 | 775 | static void sort_ref_dir(struct ref_dir *dir) |
e9c4c111 | 776 | { |
202a56a9 | 777 | int i, j; |
81a79d8e | 778 | struct ref_entry *last = NULL; |
c774aab9 | 779 | |
e6ed3ca6 MH |
780 | /* |
781 | * This check also prevents passing a zero-length array to qsort(), | |
782 | * which is a problem on some platforms. | |
783 | */ | |
d3177275 | 784 | if (dir->sorted == dir->nr) |
e9c4c111 | 785 | return; |
c774aab9 | 786 | |
d3177275 | 787 | qsort(dir->entries, dir->nr, sizeof(*dir->entries), ref_entry_cmp); |
c774aab9 | 788 | |
81a79d8e MH |
789 | /* Remove any duplicates: */ |
790 | for (i = 0, j = 0; j < dir->nr; j++) { | |
791 | struct ref_entry *entry = dir->entries[j]; | |
792 | if (last && is_dup_ref(last, entry)) | |
793 | free_ref_entry(entry); | |
794 | else | |
795 | last = dir->entries[i++] = entry; | |
e9c4c111 | 796 | } |
81a79d8e | 797 | dir->sorted = dir->nr = i; |
e9c4c111 | 798 | } |
c774aab9 | 799 | |
fcce1703 MH |
800 | /* Include broken references in a do_for_each_ref*() iteration: */ |
801 | #define DO_FOR_EACH_INCLUDE_BROKEN 0x01 | |
c774aab9 | 802 | |
662428f4 MH |
803 | /* |
804 | * Return true iff the reference described by entry can be resolved to | |
805 | * an object in the database. Emit a warning if the referred-to | |
806 | * object does not exist. | |
807 | */ | |
808 | static int ref_resolves_to_object(struct ref_entry *entry) | |
809 | { | |
810 | if (entry->flag & REF_ISBROKEN) | |
811 | return 0; | |
812 | if (!has_sha1_file(entry->u.value.sha1)) { | |
813 | error("%s does not point to a valid object!", entry->name); | |
814 | return 0; | |
815 | } | |
816 | return 1; | |
817 | } | |
c774aab9 | 818 | |
7d76fdc8 MH |
819 | /* |
820 | * current_ref is a performance hack: when iterating over references | |
821 | * using the for_each_ref*() functions, current_ref is set to the | |
822 | * current reference's entry before calling the callback function. If | |
823 | * the callback function calls peel_ref(), then peel_ref() first | |
824 | * checks whether the reference to be peeled is the current reference | |
825 | * (it usually is) and if so, returns that reference's peeled version | |
826 | * if it is available. This avoids a refname lookup in a common case. | |
827 | */ | |
bc5fd6d3 | 828 | static struct ref_entry *current_ref; |
c774aab9 | 829 | |
624cac35 MH |
830 | typedef int each_ref_entry_fn(struct ref_entry *entry, void *cb_data); |
831 | ||
832 | struct ref_entry_cb { | |
833 | const char *base; | |
834 | int trim; | |
835 | int flags; | |
836 | each_ref_fn *fn; | |
837 | void *cb_data; | |
838 | }; | |
839 | ||
fcce1703 | 840 | /* |
624cac35 MH |
841 | * Handle one reference in a do_for_each_ref*()-style iteration, |
842 | * calling an each_ref_fn for each entry. | |
fcce1703 | 843 | */ |
624cac35 | 844 | static int do_one_ref(struct ref_entry *entry, void *cb_data) |
bc5fd6d3 | 845 | { |
624cac35 | 846 | struct ref_entry_cb *data = cb_data; |
d0cf51e9 | 847 | struct ref_entry *old_current_ref; |
429213e4 | 848 | int retval; |
d0cf51e9 | 849 | |
59556548 | 850 | if (!starts_with(entry->name, data->base)) |
bc5fd6d3 | 851 | return 0; |
c774aab9 | 852 | |
624cac35 | 853 | if (!(data->flags & DO_FOR_EACH_INCLUDE_BROKEN) && |
662428f4 | 854 | !ref_resolves_to_object(entry)) |
bc5fd6d3 | 855 | return 0; |
c774aab9 | 856 | |
d0cf51e9 MH |
857 | /* Store the old value, in case this is a recursive call: */ |
858 | old_current_ref = current_ref; | |
bc5fd6d3 | 859 | current_ref = entry; |
624cac35 MH |
860 | retval = data->fn(entry->name + data->trim, entry->u.value.sha1, |
861 | entry->flag, data->cb_data); | |
d0cf51e9 | 862 | current_ref = old_current_ref; |
429213e4 | 863 | return retval; |
bc5fd6d3 | 864 | } |
c774aab9 | 865 | |
c36b5bc2 | 866 | /* |
d3177275 | 867 | * Call fn for each reference in dir that has index in the range |
432ad41e MH |
868 | * offset <= index < dir->nr. Recurse into subdirectories that are in |
869 | * that index range, sorting them before iterating. This function | |
624cac35 MH |
870 | * does not sort dir itself; it should be sorted beforehand. fn is |
871 | * called for all references, including broken ones. | |
c36b5bc2 | 872 | */ |
624cac35 MH |
873 | static int do_for_each_entry_in_dir(struct ref_dir *dir, int offset, |
874 | each_ref_entry_fn fn, void *cb_data) | |
c36b5bc2 MH |
875 | { |
876 | int i; | |
d3177275 MH |
877 | assert(dir->sorted == dir->nr); |
878 | for (i = offset; i < dir->nr; i++) { | |
432ad41e MH |
879 | struct ref_entry *entry = dir->entries[i]; |
880 | int retval; | |
881 | if (entry->flag & REF_DIR) { | |
d7826d54 MH |
882 | struct ref_dir *subdir = get_ref_dir(entry); |
883 | sort_ref_dir(subdir); | |
624cac35 | 884 | retval = do_for_each_entry_in_dir(subdir, 0, fn, cb_data); |
432ad41e | 885 | } else { |
624cac35 | 886 | retval = fn(entry, cb_data); |
432ad41e | 887 | } |
c36b5bc2 MH |
888 | if (retval) |
889 | return retval; | |
890 | } | |
891 | return 0; | |
892 | } | |
893 | ||
b3fd060f | 894 | /* |
d3177275 | 895 | * Call fn for each reference in the union of dir1 and dir2, in order |
432ad41e MH |
896 | * by refname. Recurse into subdirectories. If a value entry appears |
897 | * in both dir1 and dir2, then only process the version that is in | |
898 | * dir2. The input dirs must already be sorted, but subdirs will be | |
624cac35 MH |
899 | * sorted as needed. fn is called for all references, including |
900 | * broken ones. | |
b3fd060f | 901 | */ |
624cac35 MH |
902 | static int do_for_each_entry_in_dirs(struct ref_dir *dir1, |
903 | struct ref_dir *dir2, | |
904 | each_ref_entry_fn fn, void *cb_data) | |
b3fd060f MH |
905 | { |
906 | int retval; | |
907 | int i1 = 0, i2 = 0; | |
908 | ||
d3177275 MH |
909 | assert(dir1->sorted == dir1->nr); |
910 | assert(dir2->sorted == dir2->nr); | |
432ad41e MH |
911 | while (1) { |
912 | struct ref_entry *e1, *e2; | |
913 | int cmp; | |
914 | if (i1 == dir1->nr) { | |
624cac35 | 915 | return do_for_each_entry_in_dir(dir2, i2, fn, cb_data); |
432ad41e MH |
916 | } |
917 | if (i2 == dir2->nr) { | |
624cac35 | 918 | return do_for_each_entry_in_dir(dir1, i1, fn, cb_data); |
432ad41e MH |
919 | } |
920 | e1 = dir1->entries[i1]; | |
921 | e2 = dir2->entries[i2]; | |
922 | cmp = strcmp(e1->name, e2->name); | |
923 | if (cmp == 0) { | |
924 | if ((e1->flag & REF_DIR) && (e2->flag & REF_DIR)) { | |
925 | /* Both are directories; descend them in parallel. */ | |
d7826d54 MH |
926 | struct ref_dir *subdir1 = get_ref_dir(e1); |
927 | struct ref_dir *subdir2 = get_ref_dir(e2); | |
928 | sort_ref_dir(subdir1); | |
929 | sort_ref_dir(subdir2); | |
624cac35 MH |
930 | retval = do_for_each_entry_in_dirs( |
931 | subdir1, subdir2, fn, cb_data); | |
432ad41e MH |
932 | i1++; |
933 | i2++; | |
934 | } else if (!(e1->flag & REF_DIR) && !(e2->flag & REF_DIR)) { | |
935 | /* Both are references; ignore the one from dir1. */ | |
624cac35 | 936 | retval = fn(e2, cb_data); |
432ad41e MH |
937 | i1++; |
938 | i2++; | |
939 | } else { | |
940 | die("conflict between reference and directory: %s", | |
941 | e1->name); | |
942 | } | |
b3fd060f | 943 | } else { |
432ad41e MH |
944 | struct ref_entry *e; |
945 | if (cmp < 0) { | |
946 | e = e1; | |
b3fd060f | 947 | i1++; |
432ad41e MH |
948 | } else { |
949 | e = e2; | |
950 | i2++; | |
951 | } | |
952 | if (e->flag & REF_DIR) { | |
d7826d54 MH |
953 | struct ref_dir *subdir = get_ref_dir(e); |
954 | sort_ref_dir(subdir); | |
624cac35 MH |
955 | retval = do_for_each_entry_in_dir( |
956 | subdir, 0, fn, cb_data); | |
432ad41e | 957 | } else { |
624cac35 | 958 | retval = fn(e, cb_data); |
b3fd060f MH |
959 | } |
960 | } | |
961 | if (retval) | |
962 | return retval; | |
963 | } | |
b3fd060f MH |
964 | } |
965 | ||
98eeb09e JK |
966 | /* |
967 | * Load all of the refs from the dir into our in-memory cache. The hard work | |
968 | * of loading loose refs is done by get_ref_dir(), so we just need to recurse | |
969 | * through all of the sub-directories. We do not even need to care about | |
970 | * sorting, as traversal order does not matter to us. | |
971 | */ | |
972 | static void prime_ref_dir(struct ref_dir *dir) | |
973 | { | |
974 | int i; | |
975 | for (i = 0; i < dir->nr; i++) { | |
976 | struct ref_entry *entry = dir->entries[i]; | |
977 | if (entry->flag & REF_DIR) | |
978 | prime_ref_dir(get_ref_dir(entry)); | |
979 | } | |
980 | } | |
d66da478 MH |
981 | /* |
982 | * Return true iff refname1 and refname2 conflict with each other. | |
983 | * Two reference names conflict if one of them exactly matches the | |
984 | * leading components of the other; e.g., "foo/bar" conflicts with | |
985 | * both "foo" and with "foo/bar/baz" but not with "foo/bar" or | |
986 | * "foo/barbados". | |
987 | */ | |
988 | static int names_conflict(const char *refname1, const char *refname2) | |
989 | { | |
5a4d4947 MH |
990 | for (; *refname1 && *refname1 == *refname2; refname1++, refname2++) |
991 | ; | |
992 | return (*refname1 == '\0' && *refname2 == '/') | |
993 | || (*refname1 == '/' && *refname2 == '\0'); | |
994 | } | |
995 | ||
996 | struct name_conflict_cb { | |
997 | const char *refname; | |
998 | const char *oldrefname; | |
999 | const char *conflicting_refname; | |
1000 | }; | |
1001 | ||
624cac35 | 1002 | static int name_conflict_fn(struct ref_entry *entry, void *cb_data) |
5a4d4947 MH |
1003 | { |
1004 | struct name_conflict_cb *data = (struct name_conflict_cb *)cb_data; | |
624cac35 | 1005 | if (data->oldrefname && !strcmp(data->oldrefname, entry->name)) |
5a4d4947 | 1006 | return 0; |
624cac35 MH |
1007 | if (names_conflict(data->refname, entry->name)) { |
1008 | data->conflicting_refname = entry->name; | |
5a4d4947 | 1009 | return 1; |
d66da478 | 1010 | } |
5a4d4947 | 1011 | return 0; |
d66da478 MH |
1012 | } |
1013 | ||
bc5fd6d3 MH |
1014 | /* |
1015 | * Return true iff a reference named refname could be created without | |
624cac35 | 1016 | * conflicting with the name of an existing reference in dir. If |
5a4d4947 MH |
1017 | * oldrefname is non-NULL, ignore potential conflicts with oldrefname |
1018 | * (e.g., because oldrefname is scheduled for deletion in the same | |
bc5fd6d3 MH |
1019 | * operation). |
1020 | */ | |
1021 | static int is_refname_available(const char *refname, const char *oldrefname, | |
d3177275 | 1022 | struct ref_dir *dir) |
bc5fd6d3 | 1023 | { |
5a4d4947 MH |
1024 | struct name_conflict_cb data; |
1025 | data.refname = refname; | |
1026 | data.oldrefname = oldrefname; | |
1027 | data.conflicting_refname = NULL; | |
1028 | ||
d3177275 | 1029 | sort_ref_dir(dir); |
624cac35 | 1030 | if (do_for_each_entry_in_dir(dir, 0, name_conflict_fn, &data)) { |
5a4d4947 MH |
1031 | error("'%s' exists; cannot create '%s'", |
1032 | data.conflicting_refname, refname); | |
1033 | return 0; | |
bc5fd6d3 MH |
1034 | } |
1035 | return 1; | |
e1e22e37 LT |
1036 | } |
1037 | ||
2fff7812 MH |
1038 | struct packed_ref_cache { |
1039 | struct ref_entry *root; | |
9f69d297 | 1040 | |
5f5e2a88 MH |
1041 | /* |
1042 | * Count of references to the data structure in this instance, | |
1043 | * including the pointer from ref_cache::packed if any. The | |
1044 | * data will not be freed as long as the reference count is | |
1045 | * nonzero. | |
1046 | */ | |
1047 | unsigned int referrers; | |
1048 | ||
9f69d297 MH |
1049 | /* |
1050 | * Iff the packed-refs file associated with this instance is | |
1051 | * currently locked for writing, this points at the associated | |
4f6b83e3 MH |
1052 | * lock (which is owned by somebody else). The referrer count |
1053 | * is also incremented when the file is locked and decremented | |
1054 | * when it is unlocked. | |
9f69d297 MH |
1055 | */ |
1056 | struct lock_file *lock; | |
ca919930 JK |
1057 | |
1058 | /* The metadata from when this packed-refs cache was read */ | |
1059 | struct stat_validity validity; | |
2fff7812 MH |
1060 | }; |
1061 | ||
5e290ff7 JH |
1062 | /* |
1063 | * Future: need to be in "struct repository" | |
1064 | * when doing a full libification. | |
1065 | */ | |
79c7ca54 MH |
1066 | static struct ref_cache { |
1067 | struct ref_cache *next; | |
d12229f5 | 1068 | struct ref_entry *loose; |
2fff7812 | 1069 | struct packed_ref_cache *packed; |
9da31cb0 MH |
1070 | /* |
1071 | * The submodule name, or "" for the main repo. We allocate | |
1072 | * length 1 rather than FLEX_ARRAY so that the main ref_cache | |
1073 | * is initialized correctly. | |
1074 | */ | |
1075 | char name[1]; | |
1076 | } ref_cache, *submodule_ref_caches; | |
0e88c130 | 1077 | |
9f69d297 MH |
1078 | /* Lock used for the main packed-refs file: */ |
1079 | static struct lock_file packlock; | |
1080 | ||
5f5e2a88 MH |
1081 | /* |
1082 | * Increment the reference count of *packed_refs. | |
1083 | */ | |
1084 | static void acquire_packed_ref_cache(struct packed_ref_cache *packed_refs) | |
1085 | { | |
1086 | packed_refs->referrers++; | |
1087 | } | |
1088 | ||
1089 | /* | |
1090 | * Decrease the reference count of *packed_refs. If it goes to zero, | |
1091 | * free *packed_refs and return true; otherwise return false. | |
1092 | */ | |
1093 | static int release_packed_ref_cache(struct packed_ref_cache *packed_refs) | |
1094 | { | |
1095 | if (!--packed_refs->referrers) { | |
1096 | free_ref_entry(packed_refs->root); | |
ca919930 | 1097 | stat_validity_clear(&packed_refs->validity); |
5f5e2a88 MH |
1098 | free(packed_refs); |
1099 | return 1; | |
1100 | } else { | |
1101 | return 0; | |
1102 | } | |
1103 | } | |
1104 | ||
760c4512 | 1105 | static void clear_packed_ref_cache(struct ref_cache *refs) |
e1e22e37 | 1106 | { |
d12229f5 | 1107 | if (refs->packed) { |
5f5e2a88 MH |
1108 | struct packed_ref_cache *packed_refs = refs->packed; |
1109 | ||
1110 | if (packed_refs->lock) | |
9f69d297 | 1111 | die("internal error: packed-ref cache cleared while locked"); |
d12229f5 | 1112 | refs->packed = NULL; |
5f5e2a88 | 1113 | release_packed_ref_cache(packed_refs); |
d12229f5 | 1114 | } |
5e290ff7 | 1115 | } |
e1e22e37 | 1116 | |
760c4512 MH |
1117 | static void clear_loose_ref_cache(struct ref_cache *refs) |
1118 | { | |
d12229f5 MH |
1119 | if (refs->loose) { |
1120 | free_ref_entry(refs->loose); | |
1121 | refs->loose = NULL; | |
1122 | } | |
760c4512 MH |
1123 | } |
1124 | ||
79c7ca54 | 1125 | static struct ref_cache *create_ref_cache(const char *submodule) |
e5dbf605 | 1126 | { |
ce40979c | 1127 | int len; |
79c7ca54 | 1128 | struct ref_cache *refs; |
ce40979c MH |
1129 | if (!submodule) |
1130 | submodule = ""; | |
1131 | len = strlen(submodule) + 1; | |
79c7ca54 | 1132 | refs = xcalloc(1, sizeof(struct ref_cache) + len); |
ce40979c | 1133 | memcpy(refs->name, submodule, len); |
e5dbf605 MH |
1134 | return refs; |
1135 | } | |
1136 | ||
4349a668 | 1137 | /* |
79c7ca54 | 1138 | * Return a pointer to a ref_cache for the specified submodule. For |
4349a668 MH |
1139 | * the main repository, use submodule==NULL. The returned structure |
1140 | * will be allocated and initialized but not necessarily populated; it | |
1141 | * should not be freed. | |
1142 | */ | |
79c7ca54 | 1143 | static struct ref_cache *get_ref_cache(const char *submodule) |
4349a668 | 1144 | { |
9da31cb0 MH |
1145 | struct ref_cache *refs; |
1146 | ||
1147 | if (!submodule || !*submodule) | |
1148 | return &ref_cache; | |
1149 | ||
1150 | for (refs = submodule_ref_caches; refs; refs = refs->next) | |
0e88c130 MH |
1151 | if (!strcmp(submodule, refs->name)) |
1152 | return refs; | |
0e88c130 | 1153 | |
79c7ca54 | 1154 | refs = create_ref_cache(submodule); |
9da31cb0 MH |
1155 | refs->next = submodule_ref_caches; |
1156 | submodule_ref_caches = refs; | |
0e88c130 | 1157 | return refs; |
4349a668 MH |
1158 | } |
1159 | ||
3feb4f0c MH |
1160 | /* The length of a peeled reference line in packed-refs, including EOL: */ |
1161 | #define PEELED_LINE_LENGTH 42 | |
1162 | ||
694b7a19 MH |
1163 | /* |
1164 | * The packed-refs header line that we write out. Perhaps other | |
1165 | * traits will be added later. The trailing space is required. | |
1166 | */ | |
1167 | static const char PACKED_REFS_HEADER[] = | |
1168 | "# pack-refs with: peeled fully-peeled \n"; | |
1169 | ||
bc5fd6d3 MH |
1170 | /* |
1171 | * Parse one line from a packed-refs file. Write the SHA1 to sha1. | |
1172 | * Return a pointer to the refname within the line (null-terminated), | |
1173 | * or NULL if there was a problem. | |
1174 | */ | |
1175 | static const char *parse_ref_line(char *line, unsigned char *sha1) | |
1176 | { | |
1177 | /* | |
1178 | * 42: the answer to everything. | |
1179 | * | |
1180 | * In this case, it happens to be the answer to | |
1181 | * 40 (length of sha1 hex representation) | |
1182 | * +1 (space in between hex and name) | |
1183 | * +1 (newline at the end of the line) | |
1184 | */ | |
1185 | int len = strlen(line) - 42; | |
1186 | ||
1187 | if (len <= 0) | |
1188 | return NULL; | |
1189 | if (get_sha1_hex(line, sha1) < 0) | |
1190 | return NULL; | |
1191 | if (!isspace(line[40])) | |
1192 | return NULL; | |
1193 | line += 41; | |
1194 | if (isspace(*line)) | |
1195 | return NULL; | |
1196 | if (line[len] != '\n') | |
1197 | return NULL; | |
1198 | line[len] = 0; | |
1199 | ||
1200 | return line; | |
1201 | } | |
1202 | ||
c29c46fa MH |
1203 | /* |
1204 | * Read f, which is a packed-refs file, into dir. | |
1205 | * | |
1206 | * A comment line of the form "# pack-refs with: " may contain zero or | |
1207 | * more traits. We interpret the traits as follows: | |
1208 | * | |
1209 | * No traits: | |
1210 | * | |
1211 | * Probably no references are peeled. But if the file contains a | |
1212 | * peeled value for a reference, we will use it. | |
1213 | * | |
1214 | * peeled: | |
1215 | * | |
1216 | * References under "refs/tags/", if they *can* be peeled, *are* | |
1217 | * peeled in this file. References outside of "refs/tags/" are | |
1218 | * probably not peeled even if they could have been, but if we find | |
1219 | * a peeled value for such a reference we will use it. | |
1220 | * | |
1221 | * fully-peeled: | |
1222 | * | |
1223 | * All references in the file that can be peeled are peeled. | |
1224 | * Inversely (and this is more important), any references in the | |
1225 | * file for which no peeled value is recorded is not peelable. This | |
1226 | * trait should typically be written alongside "peeled" for | |
1227 | * compatibility with older clients, but we do not require it | |
1228 | * (i.e., "peeled" is a no-op if "fully-peeled" is set). | |
1229 | */ | |
d3177275 | 1230 | static void read_packed_refs(FILE *f, struct ref_dir *dir) |
f4204ab9 | 1231 | { |
e9c4c111 | 1232 | struct ref_entry *last = NULL; |
f4204ab9 | 1233 | char refline[PATH_MAX]; |
c29c46fa | 1234 | enum { PEELED_NONE, PEELED_TAGS, PEELED_FULLY } peeled = PEELED_NONE; |
f4204ab9 JH |
1235 | |
1236 | while (fgets(refline, sizeof(refline), f)) { | |
1237 | unsigned char sha1[20]; | |
dfefa935 | 1238 | const char *refname; |
f4204ab9 JH |
1239 | static const char header[] = "# pack-refs with:"; |
1240 | ||
1241 | if (!strncmp(refline, header, sizeof(header)-1)) { | |
1242 | const char *traits = refline + sizeof(header) - 1; | |
c29c46fa MH |
1243 | if (strstr(traits, " fully-peeled ")) |
1244 | peeled = PEELED_FULLY; | |
1245 | else if (strstr(traits, " peeled ")) | |
1246 | peeled = PEELED_TAGS; | |
f4204ab9 JH |
1247 | /* perhaps other traits later as well */ |
1248 | continue; | |
1249 | } | |
1250 | ||
dfefa935 MH |
1251 | refname = parse_ref_line(refline, sha1); |
1252 | if (refname) { | |
c29c46fa MH |
1253 | last = create_ref_entry(refname, sha1, REF_ISPACKED, 1); |
1254 | if (peeled == PEELED_FULLY || | |
59556548 | 1255 | (peeled == PEELED_TAGS && starts_with(refname, "refs/tags/"))) |
c29c46fa | 1256 | last->flag |= REF_KNOWS_PEELED; |
d3177275 | 1257 | add_ref(dir, last); |
f4204ab9 JH |
1258 | continue; |
1259 | } | |
1260 | if (last && | |
1261 | refline[0] == '^' && | |
3feb4f0c MH |
1262 | strlen(refline) == PEELED_LINE_LENGTH && |
1263 | refline[PEELED_LINE_LENGTH - 1] == '\n' && | |
c29c46fa | 1264 | !get_sha1_hex(refline + 1, sha1)) { |
593f1bb8 | 1265 | hashcpy(last->u.value.peeled, sha1); |
c29c46fa MH |
1266 | /* |
1267 | * Regardless of what the file header said, | |
1268 | * we definitely know the value of *this* | |
1269 | * reference: | |
1270 | */ | |
1271 | last->flag |= REF_KNOWS_PEELED; | |
1272 | } | |
f4204ab9 | 1273 | } |
f4204ab9 JH |
1274 | } |
1275 | ||
2fff7812 MH |
1276 | /* |
1277 | * Get the packed_ref_cache for the specified ref_cache, creating it | |
1278 | * if necessary. | |
1279 | */ | |
1280 | static struct packed_ref_cache *get_packed_ref_cache(struct ref_cache *refs) | |
5e290ff7 | 1281 | { |
ca919930 JK |
1282 | const char *packed_refs_file; |
1283 | ||
1284 | if (*refs->name) | |
1285 | packed_refs_file = git_path_submodule(refs->name, "packed-refs"); | |
1286 | else | |
1287 | packed_refs_file = git_path("packed-refs"); | |
1288 | ||
1289 | if (refs->packed && | |
1290 | !stat_validity_check(&refs->packed->validity, packed_refs_file)) | |
1291 | clear_packed_ref_cache(refs); | |
1292 | ||
d12229f5 | 1293 | if (!refs->packed) { |
4349a668 | 1294 | FILE *f; |
0bad611b | 1295 | |
2fff7812 | 1296 | refs->packed = xcalloc(1, sizeof(*refs->packed)); |
5f5e2a88 | 1297 | acquire_packed_ref_cache(refs->packed); |
2fff7812 | 1298 | refs->packed->root = create_dir_entry(refs, "", 0, 0); |
4349a668 | 1299 | f = fopen(packed_refs_file, "r"); |
e1e22e37 | 1300 | if (f) { |
ca919930 | 1301 | stat_validity_update(&refs->packed->validity, fileno(f)); |
2fff7812 | 1302 | read_packed_refs(f, get_ref_dir(refs->packed->root)); |
e1e22e37 | 1303 | fclose(f); |
e1e22e37 | 1304 | } |
e1e22e37 | 1305 | } |
2fff7812 MH |
1306 | return refs->packed; |
1307 | } | |
1308 | ||
1309 | static struct ref_dir *get_packed_ref_dir(struct packed_ref_cache *packed_ref_cache) | |
1310 | { | |
1311 | return get_ref_dir(packed_ref_cache->root); | |
1312 | } | |
1313 | ||
1314 | static struct ref_dir *get_packed_refs(struct ref_cache *refs) | |
1315 | { | |
1316 | return get_packed_ref_dir(get_packed_ref_cache(refs)); | |
e1e22e37 LT |
1317 | } |
1318 | ||
30249ee6 MH |
1319 | void add_packed_ref(const char *refname, const unsigned char *sha1) |
1320 | { | |
9f69d297 MH |
1321 | struct packed_ref_cache *packed_ref_cache = |
1322 | get_packed_ref_cache(&ref_cache); | |
1323 | ||
1324 | if (!packed_ref_cache->lock) | |
1325 | die("internal error: packed refs not locked"); | |
1326 | add_ref(get_packed_ref_dir(packed_ref_cache), | |
9da31cb0 | 1327 | create_ref_entry(refname, sha1, REF_ISPACKED, 1)); |
30249ee6 MH |
1328 | } |
1329 | ||
abc39098 | 1330 | /* |
28e6a34e MH |
1331 | * Read the loose references from the namespace dirname into dir |
1332 | * (without recursing). dirname must end with '/'. dir must be the | |
1333 | * directory entry corresponding to dirname. | |
abc39098 | 1334 | */ |
423a1afc | 1335 | static void read_loose_refs(const char *dirname, struct ref_dir *dir) |
e1e22e37 | 1336 | { |
423a1afc | 1337 | struct ref_cache *refs = dir->ref_cache; |
d3177275 | 1338 | DIR *d; |
0bad611b | 1339 | const char *path; |
d5fdae67 | 1340 | struct dirent *de; |
abc39098 | 1341 | int dirnamelen = strlen(dirname); |
72b64b44 | 1342 | struct strbuf refname; |
0bad611b | 1343 | |
3b124823 | 1344 | if (*refs->name) |
66a3d20b | 1345 | path = git_path_submodule(refs->name, "%s", dirname); |
0bad611b | 1346 | else |
66a3d20b | 1347 | path = git_path("%s", dirname); |
0bad611b | 1348 | |
d3177275 | 1349 | d = opendir(path); |
d5fdae67 MH |
1350 | if (!d) |
1351 | return; | |
1352 | ||
66a3d20b MH |
1353 | strbuf_init(&refname, dirnamelen + 257); |
1354 | strbuf_add(&refname, dirname, dirnamelen); | |
d5fdae67 MH |
1355 | |
1356 | while ((de = readdir(d)) != NULL) { | |
1357 | unsigned char sha1[20]; | |
1358 | struct stat st; | |
1359 | int flag; | |
d5fdae67 MH |
1360 | const char *refdir; |
1361 | ||
1362 | if (de->d_name[0] == '.') | |
1363 | continue; | |
2975c770 | 1364 | if (ends_with(de->d_name, ".lock")) |
d5fdae67 | 1365 | continue; |
72b64b44 | 1366 | strbuf_addstr(&refname, de->d_name); |
d5fdae67 | 1367 | refdir = *refs->name |
72b64b44 MH |
1368 | ? git_path_submodule(refs->name, "%s", refname.buf) |
1369 | : git_path("%s", refname.buf); | |
1370 | if (stat(refdir, &st) < 0) { | |
1371 | ; /* silently ignore */ | |
1372 | } else if (S_ISDIR(st.st_mode)) { | |
abc39098 | 1373 | strbuf_addch(&refname, '/'); |
28e6a34e | 1374 | add_entry_to_dir(dir, |
b9146f51 RS |
1375 | create_dir_entry(refs, refname.buf, |
1376 | refname.len, 1)); | |
72b64b44 | 1377 | } else { |
3b124823 | 1378 | if (*refs->name) { |
f8948e2f | 1379 | hashclr(sha1); |
0bad611b | 1380 | flag = 0; |
72b64b44 | 1381 | if (resolve_gitlink_ref(refs->name, refname.buf, sha1) < 0) { |
0bad611b | 1382 | hashclr(sha1); |
98ac34b2 | 1383 | flag |= REF_ISBROKEN; |
0bad611b | 1384 | } |
72b64b44 | 1385 | } else if (read_ref_full(refname.buf, sha1, 1, &flag)) { |
09116a1c JH |
1386 | hashclr(sha1); |
1387 | flag |= REF_ISBROKEN; | |
1388 | } | |
9f2fb4a3 MH |
1389 | add_entry_to_dir(dir, |
1390 | create_ref_entry(refname.buf, sha1, flag, 1)); | |
e1e22e37 | 1391 | } |
66a3d20b | 1392 | strbuf_setlen(&refname, dirnamelen); |
e1e22e37 | 1393 | } |
72b64b44 | 1394 | strbuf_release(&refname); |
d5fdae67 | 1395 | closedir(d); |
e1e22e37 LT |
1396 | } |
1397 | ||
d3177275 | 1398 | static struct ref_dir *get_loose_refs(struct ref_cache *refs) |
e1e22e37 | 1399 | { |
d12229f5 | 1400 | if (!refs->loose) { |
28e6a34e MH |
1401 | /* |
1402 | * Mark the top-level directory complete because we | |
1403 | * are about to read the only subdirectory that can | |
1404 | * hold references: | |
1405 | */ | |
b9146f51 | 1406 | refs->loose = create_dir_entry(refs, "", 0, 0); |
28e6a34e MH |
1407 | /* |
1408 | * Create an incomplete entry for "refs/": | |
1409 | */ | |
1410 | add_entry_to_dir(get_ref_dir(refs->loose), | |
b9146f51 | 1411 | create_dir_entry(refs, "refs/", 5, 1)); |
e1e22e37 | 1412 | } |
d7826d54 | 1413 | return get_ref_dir(refs->loose); |
e1e22e37 LT |
1414 | } |
1415 | ||
ca8db142 LT |
1416 | /* We allow "recursive" symbolic refs. Only within reason, though */ |
1417 | #define MAXDEPTH 5 | |
0ebde32c LT |
1418 | #define MAXREFLEN (1024) |
1419 | ||
e5fa45c1 JH |
1420 | /* |
1421 | * Called by resolve_gitlink_ref_recursive() after it failed to read | |
b0626608 MH |
1422 | * from the loose refs in ref_cache refs. Find <refname> in the |
1423 | * packed-refs file for the submodule. | |
e5fa45c1 | 1424 | */ |
b0626608 | 1425 | static int resolve_gitlink_packed_ref(struct ref_cache *refs, |
85be1fe3 | 1426 | const char *refname, unsigned char *sha1) |
0ebde32c | 1427 | { |
2c5c66be | 1428 | struct ref_entry *ref; |
d3177275 | 1429 | struct ref_dir *dir = get_packed_refs(refs); |
0ebde32c | 1430 | |
432ad41e | 1431 | ref = find_ref(dir, refname); |
b0626608 MH |
1432 | if (ref == NULL) |
1433 | return -1; | |
1434 | ||
50546b15 | 1435 | hashcpy(sha1, ref->u.value.sha1); |
b0626608 | 1436 | return 0; |
0ebde32c LT |
1437 | } |
1438 | ||
b0626608 | 1439 | static int resolve_gitlink_ref_recursive(struct ref_cache *refs, |
85be1fe3 | 1440 | const char *refname, unsigned char *sha1, |
dfefa935 | 1441 | int recursion) |
0ebde32c | 1442 | { |
064d51dc | 1443 | int fd, len; |
0ebde32c | 1444 | char buffer[128], *p; |
064d51dc | 1445 | char *path; |
0ebde32c | 1446 | |
064d51dc | 1447 | if (recursion > MAXDEPTH || strlen(refname) > MAXREFLEN) |
0ebde32c | 1448 | return -1; |
064d51dc MH |
1449 | path = *refs->name |
1450 | ? git_path_submodule(refs->name, "%s", refname) | |
1451 | : git_path("%s", refname); | |
1452 | fd = open(path, O_RDONLY); | |
0ebde32c | 1453 | if (fd < 0) |
b0626608 | 1454 | return resolve_gitlink_packed_ref(refs, refname, sha1); |
0ebde32c LT |
1455 | |
1456 | len = read(fd, buffer, sizeof(buffer)-1); | |
1457 | close(fd); | |
1458 | if (len < 0) | |
1459 | return -1; | |
1460 | while (len && isspace(buffer[len-1])) | |
1461 | len--; | |
1462 | buffer[len] = 0; | |
1463 | ||
1464 | /* Was it a detached head or an old-fashioned symlink? */ | |
85be1fe3 | 1465 | if (!get_sha1_hex(buffer, sha1)) |
0ebde32c LT |
1466 | return 0; |
1467 | ||
1468 | /* Symref? */ | |
1469 | if (strncmp(buffer, "ref:", 4)) | |
1470 | return -1; | |
1471 | p = buffer + 4; | |
1472 | while (isspace(*p)) | |
1473 | p++; | |
1474 | ||
064d51dc | 1475 | return resolve_gitlink_ref_recursive(refs, p, sha1, recursion+1); |
0ebde32c LT |
1476 | } |
1477 | ||
85be1fe3 | 1478 | int resolve_gitlink_ref(const char *path, const char *refname, unsigned char *sha1) |
0ebde32c LT |
1479 | { |
1480 | int len = strlen(path), retval; | |
064d51dc | 1481 | char *submodule; |
b0626608 | 1482 | struct ref_cache *refs; |
0ebde32c LT |
1483 | |
1484 | while (len && path[len-1] == '/') | |
1485 | len--; | |
1486 | if (!len) | |
1487 | return -1; | |
b0626608 MH |
1488 | submodule = xstrndup(path, len); |
1489 | refs = get_ref_cache(submodule); | |
1490 | free(submodule); | |
1491 | ||
064d51dc | 1492 | retval = resolve_gitlink_ref_recursive(refs, refname, sha1, 0); |
0ebde32c LT |
1493 | return retval; |
1494 | } | |
ca8db142 | 1495 | |
4886b89f | 1496 | /* |
63331581 MH |
1497 | * Return the ref_entry for the given refname from the packed |
1498 | * references. If it does not exist, return NULL. | |
4886b89f | 1499 | */ |
63331581 | 1500 | static struct ref_entry *get_packed_ref(const char *refname) |
c224ca7f | 1501 | { |
9da31cb0 | 1502 | return find_ref(get_packed_refs(&ref_cache), refname); |
c224ca7f MH |
1503 | } |
1504 | ||
47f534bf MH |
1505 | /* |
1506 | * A loose ref file doesn't exist; check for a packed ref. The | |
1507 | * options are forwarded from resolve_safe_unsafe(). | |
1508 | */ | |
1509 | static const char *handle_missing_loose_ref(const char *refname, | |
1510 | unsigned char *sha1, | |
1511 | int reading, | |
1512 | int *flag) | |
1513 | { | |
1514 | struct ref_entry *entry; | |
1515 | ||
1516 | /* | |
1517 | * The loose reference file does not exist; check for a packed | |
1518 | * reference. | |
1519 | */ | |
1520 | entry = get_packed_ref(refname); | |
1521 | if (entry) { | |
1522 | hashcpy(sha1, entry->u.value.sha1); | |
1523 | if (flag) | |
1524 | *flag |= REF_ISPACKED; | |
1525 | return refname; | |
1526 | } | |
1527 | /* The reference is not a packed reference, either. */ | |
1528 | if (reading) { | |
1529 | return NULL; | |
1530 | } else { | |
1531 | hashclr(sha1); | |
1532 | return refname; | |
1533 | } | |
1534 | } | |
1535 | ||
8d68493f | 1536 | const char *resolve_ref_unsafe(const char *refname, unsigned char *sha1, int reading, int *flag) |
8a65ff76 | 1537 | { |
0104ca09 HO |
1538 | int depth = MAXDEPTH; |
1539 | ssize_t len; | |
a876ed83 | 1540 | char buffer[256]; |
dfefa935 | 1541 | static char refname_buffer[256]; |
ca8db142 | 1542 | |
8da19775 JH |
1543 | if (flag) |
1544 | *flag = 0; | |
1545 | ||
dfefa935 | 1546 | if (check_refname_format(refname, REFNAME_ALLOW_ONELEVEL)) |
8384d788 MH |
1547 | return NULL; |
1548 | ||
a876ed83 | 1549 | for (;;) { |
55956350 | 1550 | char path[PATH_MAX]; |
a876ed83 JH |
1551 | struct stat st; |
1552 | char *buf; | |
1553 | int fd; | |
8a65ff76 | 1554 | |
a876ed83 JH |
1555 | if (--depth < 0) |
1556 | return NULL; | |
ca8db142 | 1557 | |
dfefa935 | 1558 | git_snpath(path, sizeof(path), "%s", refname); |
c224ca7f | 1559 | |
fcb7c762 MH |
1560 | /* |
1561 | * We might have to loop back here to avoid a race | |
1562 | * condition: first we lstat() the file, then we try | |
1563 | * to read it as a link or as a file. But if somebody | |
1564 | * changes the type of the file (file <-> directory | |
1565 | * <-> symlink) between the lstat() and reading, then | |
1566 | * we don't want to report that as an error but rather | |
1567 | * try again starting with the lstat(). | |
1568 | */ | |
1569 | stat_ref: | |
a876ed83 | 1570 | if (lstat(path, &st) < 0) { |
47f534bf MH |
1571 | if (errno == ENOENT) |
1572 | return handle_missing_loose_ref(refname, sha1, | |
1573 | reading, flag); | |
1574 | else | |
a876ed83 | 1575 | return NULL; |
a876ed83 | 1576 | } |
ca8db142 | 1577 | |
a876ed83 JH |
1578 | /* Follow "normalized" - ie "refs/.." symlinks by hand */ |
1579 | if (S_ISLNK(st.st_mode)) { | |
1580 | len = readlink(path, buffer, sizeof(buffer)-1); | |
fcb7c762 MH |
1581 | if (len < 0) { |
1582 | if (errno == ENOENT || errno == EINVAL) | |
1583 | /* inconsistent with lstat; retry */ | |
1584 | goto stat_ref; | |
1585 | else | |
1586 | return NULL; | |
1587 | } | |
b54cb795 | 1588 | buffer[len] = 0; |
59556548 | 1589 | if (starts_with(buffer, "refs/") && |
1f58a038 | 1590 | !check_refname_format(buffer, 0)) { |
dfefa935 MH |
1591 | strcpy(refname_buffer, buffer); |
1592 | refname = refname_buffer; | |
8da19775 JH |
1593 | if (flag) |
1594 | *flag |= REF_ISSYMREF; | |
a876ed83 JH |
1595 | continue; |
1596 | } | |
ca8db142 | 1597 | } |
a876ed83 | 1598 | |
7a21632f DS |
1599 | /* Is it a directory? */ |
1600 | if (S_ISDIR(st.st_mode)) { | |
1601 | errno = EISDIR; | |
1602 | return NULL; | |
1603 | } | |
1604 | ||
a876ed83 JH |
1605 | /* |
1606 | * Anything else, just open it and try to use it as | |
1607 | * a ref | |
1608 | */ | |
1609 | fd = open(path, O_RDONLY); | |
fcb7c762 MH |
1610 | if (fd < 0) { |
1611 | if (errno == ENOENT) | |
1612 | /* inconsistent with lstat; retry */ | |
1613 | goto stat_ref; | |
1614 | else | |
1615 | return NULL; | |
1616 | } | |
93d26e4c | 1617 | len = read_in_full(fd, buffer, sizeof(buffer)-1); |
a876ed83 | 1618 | close(fd); |
28775050 MH |
1619 | if (len < 0) |
1620 | return NULL; | |
1621 | while (len && isspace(buffer[len-1])) | |
1622 | len--; | |
1623 | buffer[len] = '\0'; | |
a876ed83 JH |
1624 | |
1625 | /* | |
1626 | * Is it a symbolic ref? | |
1627 | */ | |
59556548 | 1628 | if (!starts_with(buffer, "ref:")) { |
2884c06a MH |
1629 | /* |
1630 | * Please note that FETCH_HEAD has a second | |
1631 | * line containing other data. | |
1632 | */ | |
1633 | if (get_sha1_hex(buffer, sha1) || | |
1634 | (buffer[40] != '\0' && !isspace(buffer[40]))) { | |
1635 | if (flag) | |
1636 | *flag |= REF_ISBROKEN; | |
1637 | return NULL; | |
1638 | } | |
1639 | return refname; | |
1640 | } | |
55956350 JH |
1641 | if (flag) |
1642 | *flag |= REF_ISSYMREF; | |
a876ed83 | 1643 | buf = buffer + 4; |
28775050 MH |
1644 | while (isspace(*buf)) |
1645 | buf++; | |
313fb010 | 1646 | if (check_refname_format(buf, REFNAME_ALLOW_ONELEVEL)) { |
55956350 JH |
1647 | if (flag) |
1648 | *flag |= REF_ISBROKEN; | |
313fb010 MH |
1649 | return NULL; |
1650 | } | |
dfefa935 | 1651 | refname = strcpy(refname_buffer, buf); |
8a65ff76 | 1652 | } |
a876ed83 JH |
1653 | } |
1654 | ||
96ec7b1e NTND |
1655 | char *resolve_refdup(const char *ref, unsigned char *sha1, int reading, int *flag) |
1656 | { | |
8cad4744 | 1657 | const char *ret = resolve_ref_unsafe(ref, sha1, reading, flag); |
96ec7b1e NTND |
1658 | return ret ? xstrdup(ret) : NULL; |
1659 | } | |
1660 | ||
d08bae7e IL |
1661 | /* The argument to filter_refs */ |
1662 | struct ref_filter { | |
1663 | const char *pattern; | |
1664 | each_ref_fn *fn; | |
1665 | void *cb_data; | |
1666 | }; | |
1667 | ||
dfefa935 | 1668 | int read_ref_full(const char *refname, unsigned char *sha1, int reading, int *flags) |
a876ed83 | 1669 | { |
8d68493f | 1670 | if (resolve_ref_unsafe(refname, sha1, reading, flags)) |
a876ed83 JH |
1671 | return 0; |
1672 | return -1; | |
8a65ff76 LT |
1673 | } |
1674 | ||
dfefa935 | 1675 | int read_ref(const char *refname, unsigned char *sha1) |
c6893323 | 1676 | { |
dfefa935 | 1677 | return read_ref_full(refname, sha1, 1, NULL); |
c6893323 NTND |
1678 | } |
1679 | ||
bc5fd6d3 | 1680 | int ref_exists(const char *refname) |
ef06b918 | 1681 | { |
bc5fd6d3 MH |
1682 | unsigned char sha1[20]; |
1683 | return !!resolve_ref_unsafe(refname, sha1, 1, NULL); | |
ef06b918 JH |
1684 | } |
1685 | ||
85be1fe3 | 1686 | static int filter_refs(const char *refname, const unsigned char *sha1, int flags, |
dfefa935 | 1687 | void *data) |
d08bae7e IL |
1688 | { |
1689 | struct ref_filter *filter = (struct ref_filter *)data; | |
eb07894f | 1690 | if (wildmatch(filter->pattern, refname, 0, NULL)) |
d08bae7e | 1691 | return 0; |
85be1fe3 | 1692 | return filter->fn(refname, sha1, flags, filter->cb_data); |
d08bae7e IL |
1693 | } |
1694 | ||
68cf8703 MH |
1695 | enum peel_status { |
1696 | /* object was peeled successfully: */ | |
1697 | PEEL_PEELED = 0, | |
1698 | ||
1699 | /* | |
1700 | * object cannot be peeled because the named object (or an | |
1701 | * object referred to by a tag in the peel chain), does not | |
1702 | * exist. | |
1703 | */ | |
1704 | PEEL_INVALID = -1, | |
1705 | ||
1706 | /* object cannot be peeled because it is not a tag: */ | |
9a489f3c MH |
1707 | PEEL_NON_TAG = -2, |
1708 | ||
1709 | /* ref_entry contains no peeled value because it is a symref: */ | |
1710 | PEEL_IS_SYMREF = -3, | |
1711 | ||
1712 | /* | |
1713 | * ref_entry cannot be peeled because it is broken (i.e., the | |
1714 | * symbolic reference cannot even be resolved to an object | |
1715 | * name): | |
1716 | */ | |
1717 | PEEL_BROKEN = -4 | |
68cf8703 MH |
1718 | }; |
1719 | ||
cb2ae1c4 MH |
1720 | /* |
1721 | * Peel the named object; i.e., if the object is a tag, resolve the | |
68cf8703 MH |
1722 | * tag recursively until a non-tag is found. If successful, store the |
1723 | * result to sha1 and return PEEL_PEELED. If the object is not a tag | |
1724 | * or is not valid, return PEEL_NON_TAG or PEEL_INVALID, respectively, | |
1725 | * and leave sha1 unchanged. | |
cb2ae1c4 | 1726 | */ |
68cf8703 | 1727 | static enum peel_status peel_object(const unsigned char *name, unsigned char *sha1) |
cb2ae1c4 MH |
1728 | { |
1729 | struct object *o = lookup_unknown_object(name); | |
1730 | ||
1731 | if (o->type == OBJ_NONE) { | |
1732 | int type = sha1_object_info(name, NULL); | |
1733 | if (type < 0) | |
68cf8703 | 1734 | return PEEL_INVALID; |
cb2ae1c4 MH |
1735 | o->type = type; |
1736 | } | |
1737 | ||
1738 | if (o->type != OBJ_TAG) | |
68cf8703 | 1739 | return PEEL_NON_TAG; |
cb2ae1c4 MH |
1740 | |
1741 | o = deref_tag_noverify(o); | |
1742 | if (!o) | |
68cf8703 | 1743 | return PEEL_INVALID; |
cb2ae1c4 MH |
1744 | |
1745 | hashcpy(sha1, o->sha1); | |
68cf8703 | 1746 | return PEEL_PEELED; |
cb2ae1c4 MH |
1747 | } |
1748 | ||
9a489f3c | 1749 | /* |
f85354b5 MH |
1750 | * Peel the entry (if possible) and return its new peel_status. If |
1751 | * repeel is true, re-peel the entry even if there is an old peeled | |
1752 | * value that is already stored in it. | |
694b7a19 MH |
1753 | * |
1754 | * It is OK to call this function with a packed reference entry that | |
1755 | * might be stale and might even refer to an object that has since | |
1756 | * been garbage-collected. In such a case, if the entry has | |
1757 | * REF_KNOWS_PEELED then leave the status unchanged and return | |
1758 | * PEEL_PEELED or PEEL_NON_TAG; otherwise, return PEEL_INVALID. | |
9a489f3c | 1759 | */ |
f85354b5 | 1760 | static enum peel_status peel_entry(struct ref_entry *entry, int repeel) |
9a489f3c MH |
1761 | { |
1762 | enum peel_status status; | |
1763 | ||
f85354b5 MH |
1764 | if (entry->flag & REF_KNOWS_PEELED) { |
1765 | if (repeel) { | |
1766 | entry->flag &= ~REF_KNOWS_PEELED; | |
1767 | hashclr(entry->u.value.peeled); | |
1768 | } else { | |
1769 | return is_null_sha1(entry->u.value.peeled) ? | |
1770 | PEEL_NON_TAG : PEEL_PEELED; | |
1771 | } | |
1772 | } | |
9a489f3c MH |
1773 | if (entry->flag & REF_ISBROKEN) |
1774 | return PEEL_BROKEN; | |
1775 | if (entry->flag & REF_ISSYMREF) | |
1776 | return PEEL_IS_SYMREF; | |
1777 | ||
1778 | status = peel_object(entry->u.value.sha1, entry->u.value.peeled); | |
1779 | if (status == PEEL_PEELED || status == PEEL_NON_TAG) | |
1780 | entry->flag |= REF_KNOWS_PEELED; | |
1781 | return status; | |
1782 | } | |
1783 | ||
dfefa935 | 1784 | int peel_ref(const char *refname, unsigned char *sha1) |
cf0adba7 JH |
1785 | { |
1786 | int flag; | |
1787 | unsigned char base[20]; | |
cf0adba7 | 1788 | |
dfefa935 | 1789 | if (current_ref && (current_ref->name == refname |
9a489f3c | 1790 | || !strcmp(current_ref->name, refname))) { |
f85354b5 | 1791 | if (peel_entry(current_ref, 0)) |
9a489f3c MH |
1792 | return -1; |
1793 | hashcpy(sha1, current_ref->u.value.peeled); | |
1794 | return 0; | |
0ae91be0 SP |
1795 | } |
1796 | ||
dfefa935 | 1797 | if (read_ref_full(refname, base, 1, &flag)) |
cf0adba7 JH |
1798 | return -1; |
1799 | ||
9a489f3c MH |
1800 | /* |
1801 | * If the reference is packed, read its ref_entry from the | |
1802 | * cache in the hope that we already know its peeled value. | |
1803 | * We only try this optimization on packed references because | |
1804 | * (a) forcing the filling of the loose reference cache could | |
1805 | * be expensive and (b) loose references anyway usually do not | |
1806 | * have REF_KNOWS_PEELED. | |
1807 | */ | |
1808 | if (flag & REF_ISPACKED) { | |
f361baeb | 1809 | struct ref_entry *r = get_packed_ref(refname); |
9a489f3c | 1810 | if (r) { |
f85354b5 | 1811 | if (peel_entry(r, 0)) |
9a489f3c | 1812 | return -1; |
593f1bb8 | 1813 | hashcpy(sha1, r->u.value.peeled); |
e9c4c111 | 1814 | return 0; |
cf0adba7 | 1815 | } |
cf0adba7 JH |
1816 | } |
1817 | ||
cb2ae1c4 | 1818 | return peel_object(base, sha1); |
cf0adba7 JH |
1819 | } |
1820 | ||
bc5fd6d3 MH |
1821 | struct warn_if_dangling_data { |
1822 | FILE *fp; | |
1823 | const char *refname; | |
e6bea66d | 1824 | const struct string_list *refnames; |
bc5fd6d3 MH |
1825 | const char *msg_fmt; |
1826 | }; | |
1827 | ||
1828 | static int warn_if_dangling_symref(const char *refname, const unsigned char *sha1, | |
1829 | int flags, void *cb_data) | |
1830 | { | |
1831 | struct warn_if_dangling_data *d = cb_data; | |
1832 | const char *resolves_to; | |
1833 | unsigned char junk[20]; | |
1834 | ||
1835 | if (!(flags & REF_ISSYMREF)) | |
1836 | return 0; | |
1837 | ||
1838 | resolves_to = resolve_ref_unsafe(refname, junk, 0, NULL); | |
e6bea66d JL |
1839 | if (!resolves_to |
1840 | || (d->refname | |
1841 | ? strcmp(resolves_to, d->refname) | |
1842 | : !string_list_has_string(d->refnames, resolves_to))) { | |
bc5fd6d3 | 1843 | return 0; |
e6bea66d | 1844 | } |
bc5fd6d3 MH |
1845 | |
1846 | fprintf(d->fp, d->msg_fmt, refname); | |
1be65eda | 1847 | fputc('\n', d->fp); |
bc5fd6d3 MH |
1848 | return 0; |
1849 | } | |
1850 | ||
1851 | void warn_dangling_symref(FILE *fp, const char *msg_fmt, const char *refname) | |
1852 | { | |
1853 | struct warn_if_dangling_data data; | |
1854 | ||
1855 | data.fp = fp; | |
1856 | data.refname = refname; | |
e6bea66d JL |
1857 | data.refnames = NULL; |
1858 | data.msg_fmt = msg_fmt; | |
1859 | for_each_rawref(warn_if_dangling_symref, &data); | |
1860 | } | |
1861 | ||
1862 | void warn_dangling_symrefs(FILE *fp, const char *msg_fmt, const struct string_list *refnames) | |
1863 | { | |
1864 | struct warn_if_dangling_data data; | |
1865 | ||
1866 | data.fp = fp; | |
1867 | data.refname = NULL; | |
1868 | data.refnames = refnames; | |
bc5fd6d3 MH |
1869 | data.msg_fmt = msg_fmt; |
1870 | for_each_rawref(warn_if_dangling_symref, &data); | |
1871 | } | |
1872 | ||
fcce1703 | 1873 | /* |
65cf102b | 1874 | * Call fn for each reference in the specified ref_cache, omitting |
624cac35 MH |
1875 | * references not in the containing_dir of base. fn is called for all |
1876 | * references, including broken ones. If fn ever returns a non-zero | |
fcce1703 MH |
1877 | * value, stop the iteration and return that value; otherwise, return |
1878 | * 0. | |
1879 | */ | |
65cf102b | 1880 | static int do_for_each_entry(struct ref_cache *refs, const char *base, |
624cac35 | 1881 | each_ref_entry_fn fn, void *cb_data) |
8a65ff76 | 1882 | { |
98eeb09e JK |
1883 | struct packed_ref_cache *packed_ref_cache; |
1884 | struct ref_dir *loose_dir; | |
1885 | struct ref_dir *packed_dir; | |
933ac036 MH |
1886 | int retval = 0; |
1887 | ||
98eeb09e JK |
1888 | /* |
1889 | * We must make sure that all loose refs are read before accessing the | |
1890 | * packed-refs file; this avoids a race condition in which loose refs | |
1891 | * are migrated to the packed-refs file by a simultaneous process, but | |
1892 | * our in-memory view is from before the migration. get_packed_ref_cache() | |
1893 | * takes care of making sure our view is up to date with what is on | |
1894 | * disk. | |
1895 | */ | |
1896 | loose_dir = get_loose_refs(refs); | |
933ac036 | 1897 | if (base && *base) { |
933ac036 MH |
1898 | loose_dir = find_containing_dir(loose_dir, base, 0); |
1899 | } | |
98eeb09e JK |
1900 | if (loose_dir) |
1901 | prime_ref_dir(loose_dir); | |
1902 | ||
1903 | packed_ref_cache = get_packed_ref_cache(refs); | |
8baf2bb9 | 1904 | acquire_packed_ref_cache(packed_ref_cache); |
98eeb09e | 1905 | packed_dir = get_packed_ref_dir(packed_ref_cache); |
933ac036 MH |
1906 | if (base && *base) { |
1907 | packed_dir = find_containing_dir(packed_dir, base, 0); | |
933ac036 MH |
1908 | } |
1909 | ||
1910 | if (packed_dir && loose_dir) { | |
1911 | sort_ref_dir(packed_dir); | |
1912 | sort_ref_dir(loose_dir); | |
624cac35 MH |
1913 | retval = do_for_each_entry_in_dirs( |
1914 | packed_dir, loose_dir, fn, cb_data); | |
933ac036 MH |
1915 | } else if (packed_dir) { |
1916 | sort_ref_dir(packed_dir); | |
624cac35 MH |
1917 | retval = do_for_each_entry_in_dir( |
1918 | packed_dir, 0, fn, cb_data); | |
933ac036 MH |
1919 | } else if (loose_dir) { |
1920 | sort_ref_dir(loose_dir); | |
624cac35 MH |
1921 | retval = do_for_each_entry_in_dir( |
1922 | loose_dir, 0, fn, cb_data); | |
933ac036 MH |
1923 | } |
1924 | ||
8baf2bb9 | 1925 | release_packed_ref_cache(packed_ref_cache); |
933ac036 | 1926 | return retval; |
8a65ff76 LT |
1927 | } |
1928 | ||
624cac35 | 1929 | /* |
65cf102b | 1930 | * Call fn for each reference in the specified ref_cache for which the |
624cac35 MH |
1931 | * refname begins with base. If trim is non-zero, then trim that many |
1932 | * characters off the beginning of each refname before passing the | |
1933 | * refname to fn. flags can be DO_FOR_EACH_INCLUDE_BROKEN to include | |
1934 | * broken references in the iteration. If fn ever returns a non-zero | |
1935 | * value, stop the iteration and return that value; otherwise, return | |
1936 | * 0. | |
1937 | */ | |
65cf102b MH |
1938 | static int do_for_each_ref(struct ref_cache *refs, const char *base, |
1939 | each_ref_fn fn, int trim, int flags, void *cb_data) | |
624cac35 MH |
1940 | { |
1941 | struct ref_entry_cb data; | |
1942 | data.base = base; | |
1943 | data.trim = trim; | |
1944 | data.flags = flags; | |
1945 | data.fn = fn; | |
1946 | data.cb_data = cb_data; | |
1947 | ||
65cf102b | 1948 | return do_for_each_entry(refs, base, do_one_ref, &data); |
624cac35 MH |
1949 | } |
1950 | ||
0bad611b | 1951 | static int do_head_ref(const char *submodule, each_ref_fn fn, void *cb_data) |
723c31fe LT |
1952 | { |
1953 | unsigned char sha1[20]; | |
8da19775 JH |
1954 | int flag; |
1955 | ||
0bad611b HV |
1956 | if (submodule) { |
1957 | if (resolve_gitlink_ref(submodule, "HEAD", sha1) == 0) | |
1958 | return fn("HEAD", sha1, 0, cb_data); | |
1959 | ||
1960 | return 0; | |
1961 | } | |
1962 | ||
c6893323 | 1963 | if (!read_ref_full("HEAD", sha1, 1, &flag)) |
8da19775 | 1964 | return fn("HEAD", sha1, flag, cb_data); |
0bad611b | 1965 | |
2f34ba32 | 1966 | return 0; |
723c31fe LT |
1967 | } |
1968 | ||
0bad611b HV |
1969 | int head_ref(each_ref_fn fn, void *cb_data) |
1970 | { | |
1971 | return do_head_ref(NULL, fn, cb_data); | |
1972 | } | |
1973 | ||
9ef6aeb0 HV |
1974 | int head_ref_submodule(const char *submodule, each_ref_fn fn, void *cb_data) |
1975 | { | |
1976 | return do_head_ref(submodule, fn, cb_data); | |
1977 | } | |
1978 | ||
cb5d709f | 1979 | int for_each_ref(each_ref_fn fn, void *cb_data) |
8a65ff76 | 1980 | { |
9da31cb0 | 1981 | return do_for_each_ref(&ref_cache, "", fn, 0, 0, cb_data); |
a62be77f SE |
1982 | } |
1983 | ||
9ef6aeb0 HV |
1984 | int for_each_ref_submodule(const char *submodule, each_ref_fn fn, void *cb_data) |
1985 | { | |
65cf102b | 1986 | return do_for_each_ref(get_ref_cache(submodule), "", fn, 0, 0, cb_data); |
a62be77f SE |
1987 | } |
1988 | ||
2a8177b6 CC |
1989 | int for_each_ref_in(const char *prefix, each_ref_fn fn, void *cb_data) |
1990 | { | |
9da31cb0 | 1991 | return do_for_each_ref(&ref_cache, prefix, fn, strlen(prefix), 0, cb_data); |
2a8177b6 CC |
1992 | } |
1993 | ||
9ef6aeb0 HV |
1994 | int for_each_ref_in_submodule(const char *submodule, const char *prefix, |
1995 | each_ref_fn fn, void *cb_data) | |
1996 | { | |
65cf102b | 1997 | return do_for_each_ref(get_ref_cache(submodule), prefix, fn, strlen(prefix), 0, cb_data); |
2a8177b6 CC |
1998 | } |
1999 | ||
cb5d709f | 2000 | int for_each_tag_ref(each_ref_fn fn, void *cb_data) |
a62be77f | 2001 | { |
2a8177b6 | 2002 | return for_each_ref_in("refs/tags/", fn, cb_data); |
a62be77f SE |
2003 | } |
2004 | ||
9ef6aeb0 HV |
2005 | int for_each_tag_ref_submodule(const char *submodule, each_ref_fn fn, void *cb_data) |
2006 | { | |
2007 | return for_each_ref_in_submodule(submodule, "refs/tags/", fn, cb_data); | |
2008 | } | |
2009 | ||
cb5d709f | 2010 | int for_each_branch_ref(each_ref_fn fn, void *cb_data) |
a62be77f | 2011 | { |
2a8177b6 | 2012 | return for_each_ref_in("refs/heads/", fn, cb_data); |
a62be77f SE |
2013 | } |
2014 | ||
9ef6aeb0 HV |
2015 | int for_each_branch_ref_submodule(const char *submodule, each_ref_fn fn, void *cb_data) |
2016 | { | |
2017 | return for_each_ref_in_submodule(submodule, "refs/heads/", fn, cb_data); | |
2018 | } | |
2019 | ||
cb5d709f | 2020 | int for_each_remote_ref(each_ref_fn fn, void *cb_data) |
a62be77f | 2021 | { |
2a8177b6 | 2022 | return for_each_ref_in("refs/remotes/", fn, cb_data); |
f8948e2f JH |
2023 | } |
2024 | ||
9ef6aeb0 HV |
2025 | int for_each_remote_ref_submodule(const char *submodule, each_ref_fn fn, void *cb_data) |
2026 | { | |
2027 | return for_each_ref_in_submodule(submodule, "refs/remotes/", fn, cb_data); | |
2028 | } | |
2029 | ||
29268700 CC |
2030 | int for_each_replace_ref(each_ref_fn fn, void *cb_data) |
2031 | { | |
9da31cb0 | 2032 | return do_for_each_ref(&ref_cache, "refs/replace/", fn, 13, 0, cb_data); |
29268700 CC |
2033 | } |
2034 | ||
a1bea2c1 JT |
2035 | int head_ref_namespaced(each_ref_fn fn, void *cb_data) |
2036 | { | |
2037 | struct strbuf buf = STRBUF_INIT; | |
2038 | int ret = 0; | |
2039 | unsigned char sha1[20]; | |
2040 | int flag; | |
2041 | ||
2042 | strbuf_addf(&buf, "%sHEAD", get_git_namespace()); | |
c6893323 | 2043 | if (!read_ref_full(buf.buf, sha1, 1, &flag)) |
a1bea2c1 JT |
2044 | ret = fn(buf.buf, sha1, flag, cb_data); |
2045 | strbuf_release(&buf); | |
2046 | ||
2047 | return ret; | |
2048 | } | |
2049 | ||
2050 | int for_each_namespaced_ref(each_ref_fn fn, void *cb_data) | |
2051 | { | |
2052 | struct strbuf buf = STRBUF_INIT; | |
2053 | int ret; | |
2054 | strbuf_addf(&buf, "%srefs/", get_git_namespace()); | |
9da31cb0 | 2055 | ret = do_for_each_ref(&ref_cache, buf.buf, fn, 0, 0, cb_data); |
a1bea2c1 JT |
2056 | strbuf_release(&buf); |
2057 | return ret; | |
2058 | } | |
2059 | ||
b09fe971 IL |
2060 | int for_each_glob_ref_in(each_ref_fn fn, const char *pattern, |
2061 | const char *prefix, void *cb_data) | |
d08bae7e IL |
2062 | { |
2063 | struct strbuf real_pattern = STRBUF_INIT; | |
2064 | struct ref_filter filter; | |
d08bae7e IL |
2065 | int ret; |
2066 | ||
59556548 | 2067 | if (!prefix && !starts_with(pattern, "refs/")) |
d08bae7e | 2068 | strbuf_addstr(&real_pattern, "refs/"); |
b09fe971 IL |
2069 | else if (prefix) |
2070 | strbuf_addstr(&real_pattern, prefix); | |
d08bae7e IL |
2071 | strbuf_addstr(&real_pattern, pattern); |
2072 | ||
894a9d33 | 2073 | if (!has_glob_specials(pattern)) { |
9517e6b8 | 2074 | /* Append implied '/' '*' if not present. */ |
d08bae7e IL |
2075 | if (real_pattern.buf[real_pattern.len - 1] != '/') |
2076 | strbuf_addch(&real_pattern, '/'); | |
2077 | /* No need to check for '*', there is none. */ | |
2078 | strbuf_addch(&real_pattern, '*'); | |
2079 | } | |
2080 | ||
2081 | filter.pattern = real_pattern.buf; | |
2082 | filter.fn = fn; | |
2083 | filter.cb_data = cb_data; | |
2084 | ret = for_each_ref(filter_refs, &filter); | |
2085 | ||
2086 | strbuf_release(&real_pattern); | |
2087 | return ret; | |
2088 | } | |
2089 | ||
b09fe971 IL |
2090 | int for_each_glob_ref(each_ref_fn fn, const char *pattern, void *cb_data) |
2091 | { | |
2092 | return for_each_glob_ref_in(fn, pattern, NULL, cb_data); | |
2093 | } | |
2094 | ||
f8948e2f JH |
2095 | int for_each_rawref(each_ref_fn fn, void *cb_data) |
2096 | { | |
9da31cb0 | 2097 | return do_for_each_ref(&ref_cache, "", fn, 0, |
f8948e2f | 2098 | DO_FOR_EACH_INCLUDE_BROKEN, cb_data); |
8a65ff76 LT |
2099 | } |
2100 | ||
4577e483 | 2101 | const char *prettify_refname(const char *name) |
a9c37a72 | 2102 | { |
a9c37a72 | 2103 | return name + ( |
59556548 CC |
2104 | starts_with(name, "refs/heads/") ? 11 : |
2105 | starts_with(name, "refs/tags/") ? 10 : | |
2106 | starts_with(name, "refs/remotes/") ? 13 : | |
a9c37a72 DB |
2107 | 0); |
2108 | } | |
2109 | ||
54457fe5 | 2110 | static const char *ref_rev_parse_rules[] = { |
79803322 SP |
2111 | "%.*s", |
2112 | "refs/%.*s", | |
2113 | "refs/tags/%.*s", | |
2114 | "refs/heads/%.*s", | |
2115 | "refs/remotes/%.*s", | |
2116 | "refs/remotes/%.*s/HEAD", | |
2117 | NULL | |
2118 | }; | |
2119 | ||
54457fe5 | 2120 | int refname_match(const char *abbrev_name, const char *full_name) |
79803322 SP |
2121 | { |
2122 | const char **p; | |
2123 | const int abbrev_name_len = strlen(abbrev_name); | |
2124 | ||
54457fe5 | 2125 | for (p = ref_rev_parse_rules; *p; p++) { |
79803322 SP |
2126 | if (!strcmp(full_name, mkpath(*p, abbrev_name_len, abbrev_name))) { |
2127 | return 1; | |
2128 | } | |
2129 | } | |
2130 | ||
2131 | return 0; | |
2132 | } | |
2133 | ||
e5f38ec3 | 2134 | static struct ref_lock *verify_lock(struct ref_lock *lock, |
4bd18c43 SP |
2135 | const unsigned char *old_sha1, int mustexist) |
2136 | { | |
c6893323 | 2137 | if (read_ref_full(lock->ref_name, lock->old_sha1, mustexist, NULL)) { |
434cd0cd | 2138 | error("Can't verify ref %s", lock->ref_name); |
4bd18c43 SP |
2139 | unlock_ref(lock); |
2140 | return NULL; | |
2141 | } | |
a89fccd2 | 2142 | if (hashcmp(lock->old_sha1, old_sha1)) { |
434cd0cd | 2143 | error("Ref %s is at %s but expected %s", lock->ref_name, |
4bd18c43 SP |
2144 | sha1_to_hex(lock->old_sha1), sha1_to_hex(old_sha1)); |
2145 | unlock_ref(lock); | |
2146 | return NULL; | |
2147 | } | |
2148 | return lock; | |
2149 | } | |
2150 | ||
7155b727 | 2151 | static int remove_empty_directories(const char *file) |
bc7127ef JH |
2152 | { |
2153 | /* we want to create a file but there is a directory there; | |
2154 | * if that is an empty directory (or a directory that contains | |
2155 | * only empty directories), remove them. | |
2156 | */ | |
7155b727 JS |
2157 | struct strbuf path; |
2158 | int result; | |
bc7127ef | 2159 | |
7155b727 JS |
2160 | strbuf_init(&path, 20); |
2161 | strbuf_addstr(&path, file); | |
2162 | ||
a0f4afbe | 2163 | result = remove_dir_recursively(&path, REMOVE_DIR_EMPTY_ONLY); |
7155b727 JS |
2164 | |
2165 | strbuf_release(&path); | |
2166 | ||
2167 | return result; | |
bc7127ef JH |
2168 | } |
2169 | ||
ff74f7f1 JH |
2170 | /* |
2171 | * *string and *len will only be substituted, and *string returned (for | |
2172 | * later free()ing) if the string passed in is a magic short-hand form | |
2173 | * to name a branch. | |
2174 | */ | |
2175 | static char *substitute_branch_name(const char **string, int *len) | |
2176 | { | |
2177 | struct strbuf buf = STRBUF_INIT; | |
cf99a761 | 2178 | int ret = interpret_branch_name(*string, *len, &buf); |
ff74f7f1 JH |
2179 | |
2180 | if (ret == *len) { | |
2181 | size_t size; | |
2182 | *string = strbuf_detach(&buf, &size); | |
2183 | *len = size; | |
2184 | return (char *)*string; | |
2185 | } | |
2186 | ||
2187 | return NULL; | |
2188 | } | |
2189 | ||
2190 | int dwim_ref(const char *str, int len, unsigned char *sha1, char **ref) | |
2191 | { | |
2192 | char *last_branch = substitute_branch_name(&str, &len); | |
2193 | const char **p, *r; | |
2194 | int refs_found = 0; | |
2195 | ||
2196 | *ref = NULL; | |
2197 | for (p = ref_rev_parse_rules; *p; p++) { | |
2198 | char fullref[PATH_MAX]; | |
2199 | unsigned char sha1_from_ref[20]; | |
2200 | unsigned char *this_result; | |
2201 | int flag; | |
2202 | ||
2203 | this_result = refs_found ? sha1_from_ref : sha1; | |
2204 | mksnpath(fullref, sizeof(fullref), *p, len, str); | |
8cad4744 | 2205 | r = resolve_ref_unsafe(fullref, this_result, 1, &flag); |
ff74f7f1 JH |
2206 | if (r) { |
2207 | if (!refs_found++) | |
2208 | *ref = xstrdup(r); | |
2209 | if (!warn_ambiguous_refs) | |
2210 | break; | |
55956350 | 2211 | } else if ((flag & REF_ISSYMREF) && strcmp(fullref, "HEAD")) { |
ff74f7f1 | 2212 | warning("ignoring dangling symref %s.", fullref); |
55956350 JH |
2213 | } else if ((flag & REF_ISBROKEN) && strchr(fullref, '/')) { |
2214 | warning("ignoring broken ref %s.", fullref); | |
2215 | } | |
ff74f7f1 JH |
2216 | } |
2217 | free(last_branch); | |
2218 | return refs_found; | |
2219 | } | |
2220 | ||
2221 | int dwim_log(const char *str, int len, unsigned char *sha1, char **log) | |
2222 | { | |
2223 | char *last_branch = substitute_branch_name(&str, &len); | |
2224 | const char **p; | |
2225 | int logs_found = 0; | |
2226 | ||
2227 | *log = NULL; | |
2228 | for (p = ref_rev_parse_rules; *p; p++) { | |
ff74f7f1 JH |
2229 | unsigned char hash[20]; |
2230 | char path[PATH_MAX]; | |
2231 | const char *ref, *it; | |
2232 | ||
2233 | mksnpath(path, sizeof(path), *p, len, str); | |
8cad4744 | 2234 | ref = resolve_ref_unsafe(path, hash, 1, NULL); |
ff74f7f1 JH |
2235 | if (!ref) |
2236 | continue; | |
4da58835 | 2237 | if (reflog_exists(path)) |
ff74f7f1 | 2238 | it = path; |
4da58835 | 2239 | else if (strcmp(ref, path) && reflog_exists(ref)) |
ff74f7f1 JH |
2240 | it = ref; |
2241 | else | |
2242 | continue; | |
2243 | if (!logs_found++) { | |
2244 | *log = xstrdup(it); | |
2245 | hashcpy(sha1, hash); | |
2246 | } | |
2247 | if (!warn_ambiguous_refs) | |
2248 | break; | |
2249 | } | |
2250 | free(last_branch); | |
2251 | return logs_found; | |
2252 | } | |
2253 | ||
dfefa935 MH |
2254 | static struct ref_lock *lock_ref_sha1_basic(const char *refname, |
2255 | const unsigned char *old_sha1, | |
2256 | int flags, int *type_p) | |
4bd18c43 | 2257 | { |
434cd0cd | 2258 | char *ref_file; |
dfefa935 | 2259 | const char *orig_refname = refname; |
4bd18c43 | 2260 | struct ref_lock *lock; |
5cc3cef9 | 2261 | int last_errno = 0; |
acd3b9ec | 2262 | int type, lflags; |
4431fcc4 | 2263 | int mustexist = (old_sha1 && !is_null_sha1(old_sha1)); |
5bdd8d4a | 2264 | int missing = 0; |
c4c61c76 | 2265 | int attempts_remaining = 3; |
4bd18c43 SP |
2266 | |
2267 | lock = xcalloc(1, sizeof(struct ref_lock)); | |
2268 | lock->lock_fd = -1; | |
2269 | ||
8d68493f | 2270 | refname = resolve_ref_unsafe(refname, lock->old_sha1, mustexist, &type); |
dfefa935 | 2271 | if (!refname && errno == EISDIR) { |
bc7127ef JH |
2272 | /* we are trying to lock foo but we used to |
2273 | * have foo/bar which now does not exist; | |
2274 | * it is normal for the empty directory 'foo' | |
2275 | * to remain. | |
2276 | */ | |
dfefa935 | 2277 | ref_file = git_path("%s", orig_refname); |
5cc3cef9 JH |
2278 | if (remove_empty_directories(ref_file)) { |
2279 | last_errno = errno; | |
dfefa935 | 2280 | error("there are still refs under '%s'", orig_refname); |
5cc3cef9 JH |
2281 | goto error_return; |
2282 | } | |
8d68493f | 2283 | refname = resolve_ref_unsafe(orig_refname, lock->old_sha1, mustexist, &type); |
bc7127ef | 2284 | } |
68db31cc SV |
2285 | if (type_p) |
2286 | *type_p = type; | |
dfefa935 | 2287 | if (!refname) { |
5cc3cef9 | 2288 | last_errno = errno; |
818f477c | 2289 | error("unable to resolve reference %s: %s", |
dfefa935 | 2290 | orig_refname, strerror(errno)); |
5cc3cef9 | 2291 | goto error_return; |
4bd18c43 | 2292 | } |
5bdd8d4a | 2293 | missing = is_null_sha1(lock->old_sha1); |
c976d415 LH |
2294 | /* When the ref did not exist and we are creating it, |
2295 | * make sure there is no existing ref that is packed | |
2296 | * whose name begins with our refname, nor a ref whose | |
2297 | * name is a proper prefix of our refname. | |
2298 | */ | |
5bdd8d4a | 2299 | if (missing && |
9da31cb0 | 2300 | !is_refname_available(refname, NULL, get_packed_refs(&ref_cache))) { |
f475e08e | 2301 | last_errno = ENOTDIR; |
c976d415 | 2302 | goto error_return; |
f475e08e | 2303 | } |
22a3844e | 2304 | |
c33d5174 | 2305 | lock->lk = xcalloc(1, sizeof(struct lock_file)); |
4bd18c43 | 2306 | |
e5c223e9 | 2307 | lflags = 0; |
acd3b9ec | 2308 | if (flags & REF_NODEREF) { |
dfefa935 | 2309 | refname = orig_refname; |
acd3b9ec JH |
2310 | lflags |= LOCK_NODEREF; |
2311 | } | |
dfefa935 MH |
2312 | lock->ref_name = xstrdup(refname); |
2313 | lock->orig_ref_name = xstrdup(orig_refname); | |
2314 | ref_file = git_path("%s", refname); | |
5bdd8d4a | 2315 | if (missing) |
68db31cc SV |
2316 | lock->force_write = 1; |
2317 | if ((flags & REF_NODEREF) && (type & REF_ISSYMREF)) | |
2318 | lock->force_write = 1; | |
4bd18c43 | 2319 | |
c4c61c76 MH |
2320 | retry: |
2321 | switch (safe_create_leading_directories(ref_file)) { | |
2322 | case SCLD_OK: | |
2323 | break; /* success */ | |
2324 | case SCLD_VANISHED: | |
2325 | if (--attempts_remaining > 0) | |
2326 | goto retry; | |
2327 | /* fall through */ | |
2328 | default: | |
5cc3cef9 JH |
2329 | last_errno = errno; |
2330 | error("unable to create directory for %s", ref_file); | |
2331 | goto error_return; | |
2332 | } | |
4bd18c43 | 2333 | |
acd3b9ec | 2334 | lock->lock_fd = hold_lock_file_for_update(lock->lk, ref_file, lflags); |
e5c223e9 MH |
2335 | if (lock->lock_fd < 0) { |
2336 | if (errno == ENOENT && --attempts_remaining > 0) | |
2337 | /* | |
2338 | * Maybe somebody just deleted one of the | |
2339 | * directories leading to ref_file. Try | |
2340 | * again: | |
2341 | */ | |
2342 | goto retry; | |
2343 | else | |
2344 | unable_to_lock_index_die(ref_file, errno); | |
2345 | } | |
4bd18c43 | 2346 | return old_sha1 ? verify_lock(lock, old_sha1, mustexist) : lock; |
5cc3cef9 JH |
2347 | |
2348 | error_return: | |
2349 | unlock_ref(lock); | |
2350 | errno = last_errno; | |
2351 | return NULL; | |
4bd18c43 SP |
2352 | } |
2353 | ||
dfefa935 | 2354 | struct ref_lock *lock_ref_sha1(const char *refname, const unsigned char *old_sha1) |
95fc7512 | 2355 | { |
53cce84c | 2356 | char refpath[PATH_MAX]; |
dfefa935 | 2357 | if (check_refname_format(refname, 0)) |
4bd18c43 | 2358 | return NULL; |
dfefa935 | 2359 | strcpy(refpath, mkpath("refs/%s", refname)); |
68db31cc | 2360 | return lock_ref_sha1_basic(refpath, old_sha1, 0, NULL); |
4bd18c43 SP |
2361 | } |
2362 | ||
dfefa935 | 2363 | struct ref_lock *lock_any_ref_for_update(const char *refname, |
9bbb0fa1 BK |
2364 | const unsigned char *old_sha1, |
2365 | int flags, int *type_p) | |
4bd18c43 | 2366 | { |
dfefa935 | 2367 | if (check_refname_format(refname, REFNAME_ALLOW_ONELEVEL)) |
257f3020 | 2368 | return NULL; |
9bbb0fa1 | 2369 | return lock_ref_sha1_basic(refname, old_sha1, flags, type_p); |
c0277d15 JH |
2370 | } |
2371 | ||
fec3137f MH |
2372 | /* |
2373 | * Write an entry to the packed-refs file for the specified refname. | |
2374 | * If peeled is non-NULL, write it as the entry's peeled value. | |
2375 | */ | |
2376 | static void write_packed_entry(int fd, char *refname, unsigned char *sha1, | |
2377 | unsigned char *peeled) | |
d66da478 | 2378 | { |
d66da478 MH |
2379 | char line[PATH_MAX + 100]; |
2380 | int len; | |
2381 | ||
d66da478 MH |
2382 | len = snprintf(line, sizeof(line), "%s %s\n", |
2383 | sha1_to_hex(sha1), refname); | |
2384 | /* this should not happen but just being defensive */ | |
2385 | if (len > sizeof(line)) | |
2386 | die("too long a refname '%s'", refname); | |
fec3137f MH |
2387 | write_or_die(fd, line, len); |
2388 | ||
2389 | if (peeled) { | |
2390 | if (snprintf(line, sizeof(line), "^%s\n", | |
2391 | sha1_to_hex(peeled)) != PEELED_LINE_LENGTH) | |
2392 | die("internal error"); | |
2393 | write_or_die(fd, line, PEELED_LINE_LENGTH); | |
2394 | } | |
2395 | } | |
2396 | ||
7b40d396 MH |
2397 | /* |
2398 | * An each_ref_entry_fn that writes the entry to a packed-refs file. | |
2399 | */ | |
2400 | static int write_packed_entry_fn(struct ref_entry *entry, void *cb_data) | |
2401 | { | |
2402 | int *fd = cb_data; | |
2403 | enum peel_status peel_status = peel_entry(entry, 0); | |
2404 | ||
2405 | if (peel_status != PEEL_PEELED && peel_status != PEEL_NON_TAG) | |
2406 | error("internal error: %s is not a valid packed reference!", | |
2407 | entry->name); | |
2408 | write_packed_entry(*fd, entry->name, entry->u.value.sha1, | |
2409 | peel_status == PEEL_PEELED ? | |
2410 | entry->u.value.peeled : NULL); | |
2411 | return 0; | |
2412 | } | |
2413 | ||
9f69d297 MH |
2414 | int lock_packed_refs(int flags) |
2415 | { | |
2416 | struct packed_ref_cache *packed_ref_cache; | |
2417 | ||
9f69d297 MH |
2418 | if (hold_lock_file_for_update(&packlock, git_path("packed-refs"), flags) < 0) |
2419 | return -1; | |
5d478f5c MH |
2420 | /* |
2421 | * Get the current packed-refs while holding the lock. If the | |
2422 | * packed-refs file has been modified since we last read it, | |
2423 | * this will automatically invalidate the cache and re-read | |
2424 | * the packed-refs file. | |
2425 | */ | |
9f69d297 MH |
2426 | packed_ref_cache = get_packed_ref_cache(&ref_cache); |
2427 | packed_ref_cache->lock = &packlock; | |
4f6b83e3 MH |
2428 | /* Increment the reference count to prevent it from being freed: */ |
2429 | acquire_packed_ref_cache(packed_ref_cache); | |
9f69d297 MH |
2430 | return 0; |
2431 | } | |
2432 | ||
2433 | int commit_packed_refs(void) | |
2434 | { | |
2435 | struct packed_ref_cache *packed_ref_cache = | |
2436 | get_packed_ref_cache(&ref_cache); | |
2437 | int error = 0; | |
2438 | ||
2439 | if (!packed_ref_cache->lock) | |
2440 | die("internal error: packed-refs not locked"); | |
2441 | write_or_die(packed_ref_cache->lock->fd, | |
2442 | PACKED_REFS_HEADER, strlen(PACKED_REFS_HEADER)); | |
2443 | ||
2444 | do_for_each_entry_in_dir(get_packed_ref_dir(packed_ref_cache), | |
2445 | 0, write_packed_entry_fn, | |
2446 | &packed_ref_cache->lock->fd); | |
2447 | if (commit_lock_file(packed_ref_cache->lock)) | |
2448 | error = -1; | |
2449 | packed_ref_cache->lock = NULL; | |
4f6b83e3 | 2450 | release_packed_ref_cache(packed_ref_cache); |
9f69d297 MH |
2451 | return error; |
2452 | } | |
2453 | ||
2454 | void rollback_packed_refs(void) | |
2455 | { | |
2456 | struct packed_ref_cache *packed_ref_cache = | |
2457 | get_packed_ref_cache(&ref_cache); | |
2458 | ||
2459 | if (!packed_ref_cache->lock) | |
2460 | die("internal error: packed-refs not locked"); | |
2461 | rollback_lock_file(packed_ref_cache->lock); | |
2462 | packed_ref_cache->lock = NULL; | |
4f6b83e3 | 2463 | release_packed_ref_cache(packed_ref_cache); |
9f69d297 MH |
2464 | clear_packed_ref_cache(&ref_cache); |
2465 | } | |
2466 | ||
32d462ce MH |
2467 | struct ref_to_prune { |
2468 | struct ref_to_prune *next; | |
2469 | unsigned char sha1[20]; | |
2470 | char name[FLEX_ARRAY]; | |
2471 | }; | |
2472 | ||
2473 | struct pack_refs_cb_data { | |
2474 | unsigned int flags; | |
267f9a8c | 2475 | struct ref_dir *packed_refs; |
32d462ce | 2476 | struct ref_to_prune *ref_to_prune; |
32d462ce MH |
2477 | }; |
2478 | ||
267f9a8c MH |
2479 | /* |
2480 | * An each_ref_entry_fn that is run over loose references only. If | |
2481 | * the loose reference can be packed, add an entry in the packed ref | |
2482 | * cache. If the reference should be pruned, also add it to | |
2483 | * ref_to_prune in the pack_refs_cb_data. | |
2484 | */ | |
2485 | static int pack_if_possible_fn(struct ref_entry *entry, void *cb_data) | |
32d462ce MH |
2486 | { |
2487 | struct pack_refs_cb_data *cb = cb_data; | |
f85354b5 | 2488 | enum peel_status peel_status; |
267f9a8c | 2489 | struct ref_entry *packed_entry; |
59556548 | 2490 | int is_tag_ref = starts_with(entry->name, "refs/tags/"); |
32d462ce | 2491 | |
267f9a8c MH |
2492 | /* ALWAYS pack tags */ |
2493 | if (!(cb->flags & PACK_REFS_ALL) && !is_tag_ref) | |
32d462ce MH |
2494 | return 0; |
2495 | ||
b2a8226d MH |
2496 | /* Do not pack symbolic or broken refs: */ |
2497 | if ((entry->flag & REF_ISSYMREF) || !ref_resolves_to_object(entry)) | |
2498 | return 0; | |
2499 | ||
267f9a8c | 2500 | /* Add a packed ref cache entry equivalent to the loose entry. */ |
f85354b5 | 2501 | peel_status = peel_entry(entry, 1); |
0f29920f | 2502 | if (peel_status != PEEL_PEELED && peel_status != PEEL_NON_TAG) |
f85354b5 MH |
2503 | die("internal error peeling reference %s (%s)", |
2504 | entry->name, sha1_to_hex(entry->u.value.sha1)); | |
267f9a8c MH |
2505 | packed_entry = find_ref(cb->packed_refs, entry->name); |
2506 | if (packed_entry) { | |
2507 | /* Overwrite existing packed entry with info from loose entry */ | |
2508 | packed_entry->flag = REF_ISPACKED | REF_KNOWS_PEELED; | |
2509 | hashcpy(packed_entry->u.value.sha1, entry->u.value.sha1); | |
2510 | } else { | |
2511 | packed_entry = create_ref_entry(entry->name, entry->u.value.sha1, | |
2512 | REF_ISPACKED | REF_KNOWS_PEELED, 0); | |
2513 | add_ref(cb->packed_refs, packed_entry); | |
2514 | } | |
2515 | hashcpy(packed_entry->u.value.peeled, entry->u.value.peeled); | |
32d462ce | 2516 | |
267f9a8c MH |
2517 | /* Schedule the loose reference for pruning if requested. */ |
2518 | if ((cb->flags & PACK_REFS_PRUNE)) { | |
12e77559 | 2519 | int namelen = strlen(entry->name) + 1; |
32d462ce | 2520 | struct ref_to_prune *n = xcalloc(1, sizeof(*n) + namelen); |
12e77559 MH |
2521 | hashcpy(n->sha1, entry->u.value.sha1); |
2522 | strcpy(n->name, entry->name); | |
32d462ce MH |
2523 | n->next = cb->ref_to_prune; |
2524 | cb->ref_to_prune = n; | |
2525 | } | |
d66da478 MH |
2526 | return 0; |
2527 | } | |
2528 | ||
32d462ce MH |
2529 | /* |
2530 | * Remove empty parents, but spare refs/ and immediate subdirs. | |
2531 | * Note: munges *name. | |
2532 | */ | |
2533 | static void try_remove_empty_parents(char *name) | |
2534 | { | |
2535 | char *p, *q; | |
2536 | int i; | |
2537 | p = name; | |
2538 | for (i = 0; i < 2; i++) { /* refs/{heads,tags,...}/ */ | |
2539 | while (*p && *p != '/') | |
2540 | p++; | |
2541 | /* tolerate duplicate slashes; see check_refname_format() */ | |
2542 | while (*p == '/') | |
2543 | p++; | |
2544 | } | |
2545 | for (q = p; *q; q++) | |
2546 | ; | |
2547 | while (1) { | |
2548 | while (q > p && *q != '/') | |
2549 | q--; | |
2550 | while (q > p && *(q-1) == '/') | |
2551 | q--; | |
2552 | if (q == p) | |
2553 | break; | |
2554 | *q = '\0'; | |
2555 | if (rmdir(git_path("%s", name))) | |
2556 | break; | |
2557 | } | |
2558 | } | |
2559 | ||
2560 | /* make sure nobody touched the ref, and unlink */ | |
2561 | static void prune_ref(struct ref_to_prune *r) | |
2562 | { | |
2563 | struct ref_lock *lock = lock_ref_sha1(r->name + 5, r->sha1); | |
2564 | ||
2565 | if (lock) { | |
2566 | unlink_or_warn(git_path("%s", r->name)); | |
2567 | unlock_ref(lock); | |
2568 | try_remove_empty_parents(r->name); | |
2569 | } | |
2570 | } | |
2571 | ||
2572 | static void prune_refs(struct ref_to_prune *r) | |
2573 | { | |
2574 | while (r) { | |
2575 | prune_ref(r); | |
2576 | r = r->next; | |
2577 | } | |
2578 | } | |
2579 | ||
32d462ce MH |
2580 | int pack_refs(unsigned int flags) |
2581 | { | |
32d462ce MH |
2582 | struct pack_refs_cb_data cbdata; |
2583 | ||
2584 | memset(&cbdata, 0, sizeof(cbdata)); | |
2585 | cbdata.flags = flags; | |
2586 | ||
9f69d297 | 2587 | lock_packed_refs(LOCK_DIE_ON_ERROR); |
267f9a8c | 2588 | cbdata.packed_refs = get_packed_refs(&ref_cache); |
32d462ce | 2589 | |
267f9a8c MH |
2590 | do_for_each_entry_in_dir(get_loose_refs(&ref_cache), 0, |
2591 | pack_if_possible_fn, &cbdata); | |
32d462ce | 2592 | |
9f69d297 | 2593 | if (commit_packed_refs()) |
32d462ce | 2594 | die_errno("unable to overwrite old ref-pack file"); |
9f69d297 | 2595 | |
32d462ce MH |
2596 | prune_refs(cbdata.ref_to_prune); |
2597 | return 0; | |
2598 | } | |
2599 | ||
7b40d396 MH |
2600 | /* |
2601 | * If entry is no longer needed in packed-refs, add it to the string | |
2602 | * list pointed to by cb_data. Reasons for deleting entries: | |
2603 | * | |
2604 | * - Entry is broken. | |
2605 | * - Entry is overridden by a loose ref. | |
2606 | * - Entry does not point at a valid object. | |
2607 | * | |
2608 | * In the first and third cases, also emit an error message because these | |
2609 | * are indications of repository corruption. | |
2610 | */ | |
2611 | static int curate_packed_ref_fn(struct ref_entry *entry, void *cb_data) | |
c0277d15 | 2612 | { |
7b40d396 | 2613 | struct string_list *refs_to_delete = cb_data; |
fec3137f | 2614 | |
ab292bc4 MH |
2615 | if (entry->flag & REF_ISBROKEN) { |
2616 | /* This shouldn't happen to packed refs. */ | |
2617 | error("%s is broken!", entry->name); | |
7b40d396 | 2618 | string_list_append(refs_to_delete, entry->name); |
c0277d15 | 2619 | return 0; |
ab292bc4 MH |
2620 | } |
2621 | if (!has_sha1_file(entry->u.value.sha1)) { | |
2622 | unsigned char sha1[20]; | |
2623 | int flags; | |
2624 | ||
2625 | if (read_ref_full(entry->name, sha1, 0, &flags)) | |
2626 | /* We should at least have found the packed ref. */ | |
2627 | die("Internal error"); | |
7b40d396 | 2628 | if ((flags & REF_ISSYMREF) || !(flags & REF_ISPACKED)) { |
ab292bc4 MH |
2629 | /* |
2630 | * This packed reference is overridden by a | |
2631 | * loose reference, so it is OK that its value | |
2632 | * is no longer valid; for example, it might | |
2633 | * refer to an object that has been garbage | |
2634 | * collected. For this purpose we don't even | |
2635 | * care whether the loose reference itself is | |
2636 | * invalid, broken, symbolic, etc. Silently | |
7b40d396 | 2637 | * remove the packed reference. |
ab292bc4 | 2638 | */ |
7b40d396 | 2639 | string_list_append(refs_to_delete, entry->name); |
ab292bc4 | 2640 | return 0; |
7b40d396 | 2641 | } |
ab292bc4 MH |
2642 | /* |
2643 | * There is no overriding loose reference, so the fact | |
2644 | * that this reference doesn't refer to a valid object | |
2645 | * indicates some kind of repository corruption. | |
2646 | * Report the problem, then omit the reference from | |
2647 | * the output. | |
2648 | */ | |
2649 | error("%s does not point to a valid object!", entry->name); | |
7b40d396 | 2650 | string_list_append(refs_to_delete, entry->name); |
ab292bc4 MH |
2651 | return 0; |
2652 | } | |
2653 | ||
d66da478 MH |
2654 | return 0; |
2655 | } | |
2656 | ||
c9e768bb | 2657 | int repack_without_refs(const char **refnames, int n) |
c0277d15 | 2658 | { |
7618fd80 | 2659 | struct ref_dir *packed; |
7b40d396 MH |
2660 | struct string_list refs_to_delete = STRING_LIST_INIT_DUP; |
2661 | struct string_list_item *ref_to_delete; | |
61cee0db BK |
2662 | int i, removed = 0; |
2663 | ||
2664 | /* Look for a packed ref */ | |
2665 | for (i = 0; i < n; i++) | |
2666 | if (get_packed_ref(refnames[i])) | |
2667 | break; | |
7618fd80 | 2668 | |
61cee0db BK |
2669 | /* Avoid locking if we have nothing to do */ |
2670 | if (i == n) | |
2671 | return 0; /* no refname exists in packed refs */ | |
7618fd80 | 2672 | |
9f69d297 | 2673 | if (lock_packed_refs(0)) { |
1b018fd9 | 2674 | unable_to_lock_error(git_path("packed-refs"), errno); |
61cee0db | 2675 | return error("cannot delete '%s' from packed refs", refnames[i]); |
1b018fd9 | 2676 | } |
9da31cb0 | 2677 | packed = get_packed_refs(&ref_cache); |
7b40d396 | 2678 | |
61cee0db BK |
2679 | /* Remove refnames from the cache */ |
2680 | for (i = 0; i < n; i++) | |
2681 | if (remove_entry(packed, refnames[i]) != -1) | |
2682 | removed = 1; | |
2683 | if (!removed) { | |
506a760d | 2684 | /* |
61cee0db | 2685 | * All packed entries disappeared while we were |
506a760d MH |
2686 | * acquiring the lock. |
2687 | */ | |
9f69d297 | 2688 | rollback_packed_refs(); |
506a760d MH |
2689 | return 0; |
2690 | } | |
7b40d396 | 2691 | |
61cee0db | 2692 | /* Remove any other accumulated cruft */ |
7b40d396 MH |
2693 | do_for_each_entry_in_dir(packed, 0, curate_packed_ref_fn, &refs_to_delete); |
2694 | for_each_string_list_item(ref_to_delete, &refs_to_delete) { | |
2695 | if (remove_entry(packed, ref_to_delete->string) == -1) | |
2696 | die("internal error"); | |
2697 | } | |
2698 | ||
61cee0db | 2699 | /* Write what remains */ |
9f69d297 | 2700 | return commit_packed_refs(); |
c0277d15 JH |
2701 | } |
2702 | ||
61cee0db | 2703 | static int repack_without_ref(const char *refname) |
c0277d15 | 2704 | { |
61cee0db BK |
2705 | return repack_without_refs(&refname, 1); |
2706 | } | |
c0277d15 | 2707 | |
2ddb5d17 BK |
2708 | static int delete_ref_loose(struct ref_lock *lock, int flag) |
2709 | { | |
045a476f | 2710 | if (!(flag & REF_ISPACKED) || flag & REF_ISSYMREF) { |
c0277d15 | 2711 | /* loose */ |
2ddb5d17 BK |
2712 | int err, i = strlen(lock->lk->filename) - 5; /* .lock */ |
2713 | ||
547d058f RS |
2714 | lock->lk->filename[i] = 0; |
2715 | err = unlink_or_warn(lock->lk->filename); | |
547d058f | 2716 | lock->lk->filename[i] = '.'; |
2ddb5d17 BK |
2717 | if (err && errno != ENOENT) |
2718 | return 1; | |
c0277d15 | 2719 | } |
2ddb5d17 BK |
2720 | return 0; |
2721 | } | |
2722 | ||
eca35a25 | 2723 | int delete_ref(const char *refname, const unsigned char *sha1, int delopt) |
c0277d15 JH |
2724 | { |
2725 | struct ref_lock *lock; | |
2ddb5d17 | 2726 | int ret = 0, flag = 0; |
c0277d15 | 2727 | |
547d058f | 2728 | lock = lock_ref_sha1_basic(refname, sha1, delopt, &flag); |
c0277d15 JH |
2729 | if (!lock) |
2730 | return 1; | |
2ddb5d17 | 2731 | ret |= delete_ref_loose(lock, flag); |
691f1a28 | 2732 | |
c0277d15 JH |
2733 | /* removing the loose one could have resurrected an earlier |
2734 | * packed one. Also, if it was not loose we need to repack | |
2735 | * without it. | |
2736 | */ | |
b274a714 | 2737 | ret |= repack_without_ref(lock->ref_name); |
c0277d15 | 2738 | |
691f1a28 | 2739 | unlink_or_warn(git_path("logs/%s", lock->ref_name)); |
9da31cb0 | 2740 | clear_loose_ref_cache(&ref_cache); |
c0277d15 JH |
2741 | unlock_ref(lock); |
2742 | return ret; | |
4bd18c43 SP |
2743 | } |
2744 | ||
765c2258 PH |
2745 | /* |
2746 | * People using contrib's git-new-workdir have .git/logs/refs -> | |
2747 | * /some/other/path/.git/logs/refs, and that may live on another device. | |
2748 | * | |
2749 | * IOW, to avoid cross device rename errors, the temporary renamed log must | |
2750 | * live into logs/refs. | |
2751 | */ | |
2752 | #define TMP_RENAMED_LOG "logs/refs/.tmp-renamed-log" | |
2753 | ||
fa59ae79 MH |
2754 | static int rename_tmp_log(const char *newrefname) |
2755 | { | |
f1e9e9a4 | 2756 | int attempts_remaining = 4; |
ae4a283e MH |
2757 | |
2758 | retry: | |
08f555cb MH |
2759 | switch (safe_create_leading_directories(git_path("logs/%s", newrefname))) { |
2760 | case SCLD_OK: | |
2761 | break; /* success */ | |
2762 | case SCLD_VANISHED: | |
2763 | if (--attempts_remaining > 0) | |
2764 | goto retry; | |
2765 | /* fall through */ | |
2766 | default: | |
fa59ae79 MH |
2767 | error("unable to create directory for %s", newrefname); |
2768 | return -1; | |
2769 | } | |
2770 | ||
fa59ae79 | 2771 | if (rename(git_path(TMP_RENAMED_LOG), git_path("logs/%s", newrefname))) { |
f1e9e9a4 | 2772 | if ((errno==EISDIR || errno==ENOTDIR) && --attempts_remaining > 0) { |
fa59ae79 MH |
2773 | /* |
2774 | * rename(a, b) when b is an existing | |
2775 | * directory ought to result in ISDIR, but | |
2776 | * Solaris 5.8 gives ENOTDIR. Sheesh. | |
2777 | */ | |
2778 | if (remove_empty_directories(git_path("logs/%s", newrefname))) { | |
2779 | error("Directory not empty: logs/%s", newrefname); | |
2780 | return -1; | |
2781 | } | |
2782 | goto retry; | |
ae4a283e MH |
2783 | } else if (errno == ENOENT && --attempts_remaining > 0) { |
2784 | /* | |
2785 | * Maybe another process just deleted one of | |
2786 | * the directories in the path to newrefname. | |
2787 | * Try again from the beginning. | |
2788 | */ | |
2789 | goto retry; | |
fa59ae79 MH |
2790 | } else { |
2791 | error("unable to move logfile "TMP_RENAMED_LOG" to logs/%s: %s", | |
2792 | newrefname, strerror(errno)); | |
2793 | return -1; | |
2794 | } | |
2795 | } | |
2796 | return 0; | |
2797 | } | |
2798 | ||
dfefa935 | 2799 | int rename_ref(const char *oldrefname, const char *newrefname, const char *logmsg) |
c976d415 | 2800 | { |
c976d415 LH |
2801 | unsigned char sha1[20], orig_sha1[20]; |
2802 | int flag = 0, logmoved = 0; | |
2803 | struct ref_lock *lock; | |
c976d415 | 2804 | struct stat loginfo; |
dfefa935 | 2805 | int log = !lstat(git_path("logs/%s", oldrefname), &loginfo); |
eca35a25 | 2806 | const char *symref = NULL; |
c976d415 | 2807 | |
450d4c0f | 2808 | if (log && S_ISLNK(loginfo.st_mode)) |
dfefa935 | 2809 | return error("reflog for %s is a symlink", oldrefname); |
c976d415 | 2810 | |
8d68493f | 2811 | symref = resolve_ref_unsafe(oldrefname, orig_sha1, 1, &flag); |
eca35a25 | 2812 | if (flag & REF_ISSYMREF) |
fa58186c | 2813 | return error("refname %s is a symbolic ref, renaming it is not supported", |
dfefa935 | 2814 | oldrefname); |
eca35a25 | 2815 | if (!symref) |
dfefa935 | 2816 | return error("refname %s not found", oldrefname); |
c976d415 | 2817 | |
9da31cb0 | 2818 | if (!is_refname_available(newrefname, oldrefname, get_packed_refs(&ref_cache))) |
c976d415 LH |
2819 | return 1; |
2820 | ||
9da31cb0 | 2821 | if (!is_refname_available(newrefname, oldrefname, get_loose_refs(&ref_cache))) |
c976d415 LH |
2822 | return 1; |
2823 | ||
dfefa935 | 2824 | if (log && rename(git_path("logs/%s", oldrefname), git_path(TMP_RENAMED_LOG))) |
765c2258 | 2825 | return error("unable to move logfile logs/%s to "TMP_RENAMED_LOG": %s", |
dfefa935 | 2826 | oldrefname, strerror(errno)); |
c976d415 | 2827 | |
dfefa935 MH |
2828 | if (delete_ref(oldrefname, orig_sha1, REF_NODEREF)) { |
2829 | error("unable to delete old %s", oldrefname); | |
c976d415 LH |
2830 | goto rollback; |
2831 | } | |
2832 | ||
dfefa935 MH |
2833 | if (!read_ref_full(newrefname, sha1, 1, &flag) && |
2834 | delete_ref(newrefname, sha1, REF_NODEREF)) { | |
c976d415 | 2835 | if (errno==EISDIR) { |
dfefa935 MH |
2836 | if (remove_empty_directories(git_path("%s", newrefname))) { |
2837 | error("Directory not empty: %s", newrefname); | |
c976d415 LH |
2838 | goto rollback; |
2839 | } | |
2840 | } else { | |
dfefa935 | 2841 | error("unable to delete existing %s", newrefname); |
c976d415 LH |
2842 | goto rollback; |
2843 | } | |
2844 | } | |
2845 | ||
fa59ae79 | 2846 | if (log && rename_tmp_log(newrefname)) |
c976d415 | 2847 | goto rollback; |
c976d415 | 2848 | |
c976d415 LH |
2849 | logmoved = log; |
2850 | ||
dfefa935 | 2851 | lock = lock_ref_sha1_basic(newrefname, NULL, 0, NULL); |
c976d415 | 2852 | if (!lock) { |
dfefa935 | 2853 | error("unable to lock %s for update", newrefname); |
c976d415 LH |
2854 | goto rollback; |
2855 | } | |
c976d415 LH |
2856 | lock->force_write = 1; |
2857 | hashcpy(lock->old_sha1, orig_sha1); | |
678d0f4c | 2858 | if (write_ref_sha1(lock, orig_sha1, logmsg)) { |
dfefa935 | 2859 | error("unable to write current sha1 into %s", newrefname); |
c976d415 LH |
2860 | goto rollback; |
2861 | } | |
2862 | ||
2863 | return 0; | |
2864 | ||
2865 | rollback: | |
dfefa935 | 2866 | lock = lock_ref_sha1_basic(oldrefname, NULL, 0, NULL); |
c976d415 | 2867 | if (!lock) { |
dfefa935 | 2868 | error("unable to lock %s for rollback", oldrefname); |
c976d415 LH |
2869 | goto rollbacklog; |
2870 | } | |
2871 | ||
2872 | lock->force_write = 1; | |
2873 | flag = log_all_ref_updates; | |
2874 | log_all_ref_updates = 0; | |
2875 | if (write_ref_sha1(lock, orig_sha1, NULL)) | |
dfefa935 | 2876 | error("unable to write current sha1 into %s", oldrefname); |
c976d415 LH |
2877 | log_all_ref_updates = flag; |
2878 | ||
2879 | rollbacklog: | |
dfefa935 | 2880 | if (logmoved && rename(git_path("logs/%s", newrefname), git_path("logs/%s", oldrefname))) |
c976d415 | 2881 | error("unable to restore logfile %s from %s: %s", |
dfefa935 | 2882 | oldrefname, newrefname, strerror(errno)); |
c976d415 | 2883 | if (!logmoved && log && |
dfefa935 | 2884 | rename(git_path(TMP_RENAMED_LOG), git_path("logs/%s", oldrefname))) |
765c2258 | 2885 | error("unable to restore logfile %s from "TMP_RENAMED_LOG": %s", |
dfefa935 | 2886 | oldrefname, strerror(errno)); |
c976d415 LH |
2887 | |
2888 | return 1; | |
2889 | } | |
2890 | ||
435fc852 | 2891 | int close_ref(struct ref_lock *lock) |
b531394d BC |
2892 | { |
2893 | if (close_lock_file(lock->lk)) | |
2894 | return -1; | |
2895 | lock->lock_fd = -1; | |
2896 | return 0; | |
2897 | } | |
2898 | ||
435fc852 | 2899 | int commit_ref(struct ref_lock *lock) |
b531394d BC |
2900 | { |
2901 | if (commit_lock_file(lock->lk)) | |
2902 | return -1; | |
2903 | lock->lock_fd = -1; | |
2904 | return 0; | |
2905 | } | |
2906 | ||
e5f38ec3 | 2907 | void unlock_ref(struct ref_lock *lock) |
4bd18c43 | 2908 | { |
4ed7cd3a BC |
2909 | /* Do not free lock->lk -- atexit() still looks at them */ |
2910 | if (lock->lk) | |
2911 | rollback_lock_file(lock->lk); | |
434cd0cd | 2912 | free(lock->ref_name); |
1655707c | 2913 | free(lock->orig_ref_name); |
4bd18c43 SP |
2914 | free(lock); |
2915 | } | |
2916 | ||
0ec29a47 JH |
2917 | /* |
2918 | * copy the reflog message msg to buf, which has been allocated sufficiently | |
2919 | * large, while cleaning up the whitespaces. Especially, convert LF to space, | |
2920 | * because reflog file is one line per entry. | |
2921 | */ | |
2922 | static int copy_msg(char *buf, const char *msg) | |
2923 | { | |
2924 | char *cp = buf; | |
2925 | char c; | |
2926 | int wasspace = 1; | |
2927 | ||
2928 | *cp++ = '\t'; | |
2929 | while ((c = *msg++)) { | |
2930 | if (wasspace && isspace(c)) | |
2931 | continue; | |
2932 | wasspace = isspace(c); | |
2933 | if (wasspace) | |
2934 | c = ' '; | |
2935 | *cp++ = c; | |
2936 | } | |
2937 | while (buf < cp && isspace(cp[-1])) | |
2938 | cp--; | |
2939 | *cp++ = '\n'; | |
2940 | return cp - buf; | |
2941 | } | |
2942 | ||
dfefa935 | 2943 | int log_ref_setup(const char *refname, char *logfile, int bufsize) |
6de08ae6 | 2944 | { |
859c3017 | 2945 | int logfd, oflags = O_APPEND | O_WRONLY; |
9a13f0b7 | 2946 | |
dfefa935 | 2947 | git_snpath(logfile, bufsize, "logs/%s", refname); |
4057deb5 | 2948 | if (log_all_ref_updates && |
59556548 CC |
2949 | (starts_with(refname, "refs/heads/") || |
2950 | starts_with(refname, "refs/remotes/") || | |
2951 | starts_with(refname, "refs/notes/") || | |
dfefa935 | 2952 | !strcmp(refname, "HEAD"))) { |
157aaea5 | 2953 | if (safe_create_leading_directories(logfile) < 0) |
6de08ae6 | 2954 | return error("unable to create directory for %s", |
157aaea5 | 2955 | logfile); |
6de08ae6 SP |
2956 | oflags |= O_CREAT; |
2957 | } | |
2958 | ||
157aaea5 | 2959 | logfd = open(logfile, oflags, 0666); |
6de08ae6 | 2960 | if (logfd < 0) { |
1974bf62 | 2961 | if (!(oflags & O_CREAT) && errno == ENOENT) |
6de08ae6 | 2962 | return 0; |
3b463c3f JH |
2963 | |
2964 | if ((oflags & O_CREAT) && errno == EISDIR) { | |
157aaea5 | 2965 | if (remove_empty_directories(logfile)) { |
3b463c3f | 2966 | return error("There are still logs under '%s'", |
157aaea5 | 2967 | logfile); |
3b463c3f | 2968 | } |
157aaea5 | 2969 | logfd = open(logfile, oflags, 0666); |
3b463c3f JH |
2970 | } |
2971 | ||
2972 | if (logfd < 0) | |
2973 | return error("Unable to append to %s: %s", | |
157aaea5 | 2974 | logfile, strerror(errno)); |
6de08ae6 SP |
2975 | } |
2976 | ||
157aaea5 | 2977 | adjust_shared_perm(logfile); |
859c3017 EM |
2978 | close(logfd); |
2979 | return 0; | |
2980 | } | |
443b92b6 | 2981 | |
dfefa935 | 2982 | static int log_ref_write(const char *refname, const unsigned char *old_sha1, |
859c3017 EM |
2983 | const unsigned char *new_sha1, const char *msg) |
2984 | { | |
2985 | int logfd, result, written, oflags = O_APPEND | O_WRONLY; | |
2986 | unsigned maxlen, len; | |
2987 | int msglen; | |
157aaea5 | 2988 | char log_file[PATH_MAX]; |
859c3017 EM |
2989 | char *logrec; |
2990 | const char *committer; | |
2991 | ||
2992 | if (log_all_ref_updates < 0) | |
2993 | log_all_ref_updates = !is_bare_repository(); | |
2994 | ||
dfefa935 | 2995 | result = log_ref_setup(refname, log_file, sizeof(log_file)); |
859c3017 EM |
2996 | if (result) |
2997 | return result; | |
2998 | ||
2999 | logfd = open(log_file, oflags); | |
3000 | if (logfd < 0) | |
3001 | return 0; | |
0ec29a47 | 3002 | msglen = msg ? strlen(msg) : 0; |
774751a8 | 3003 | committer = git_committer_info(0); |
8ac65937 JH |
3004 | maxlen = strlen(committer) + msglen + 100; |
3005 | logrec = xmalloc(maxlen); | |
3006 | len = sprintf(logrec, "%s %s %s\n", | |
9a13f0b7 NP |
3007 | sha1_to_hex(old_sha1), |
3008 | sha1_to_hex(new_sha1), | |
8ac65937 JH |
3009 | committer); |
3010 | if (msglen) | |
0ec29a47 | 3011 | len += copy_msg(logrec + len - 1, msg) - 1; |
93822c22 | 3012 | written = len <= maxlen ? write_in_full(logfd, logrec, len) : -1; |
6de08ae6 | 3013 | free(logrec); |
91c8d590 | 3014 | if (close(logfd) != 0 || written != len) |
9a13f0b7 | 3015 | return error("Unable to append to %s", log_file); |
6de08ae6 SP |
3016 | return 0; |
3017 | } | |
3018 | ||
c3b0dec5 LT |
3019 | static int is_branch(const char *refname) |
3020 | { | |
59556548 | 3021 | return !strcmp(refname, "HEAD") || starts_with(refname, "refs/heads/"); |
c3b0dec5 LT |
3022 | } |
3023 | ||
4bd18c43 SP |
3024 | int write_ref_sha1(struct ref_lock *lock, |
3025 | const unsigned char *sha1, const char *logmsg) | |
3026 | { | |
3027 | static char term = '\n'; | |
c3b0dec5 | 3028 | struct object *o; |
4bd18c43 SP |
3029 | |
3030 | if (!lock) | |
95fc7512 | 3031 | return -1; |
a89fccd2 | 3032 | if (!lock->force_write && !hashcmp(lock->old_sha1, sha1)) { |
4bd18c43 SP |
3033 | unlock_ref(lock); |
3034 | return 0; | |
95fc7512 | 3035 | } |
c3b0dec5 LT |
3036 | o = parse_object(sha1); |
3037 | if (!o) { | |
7be8b3ba | 3038 | error("Trying to write ref %s with nonexistent object %s", |
c3b0dec5 LT |
3039 | lock->ref_name, sha1_to_hex(sha1)); |
3040 | unlock_ref(lock); | |
3041 | return -1; | |
3042 | } | |
3043 | if (o->type != OBJ_COMMIT && is_branch(lock->ref_name)) { | |
3044 | error("Trying to write non-commit object %s to branch %s", | |
3045 | sha1_to_hex(sha1), lock->ref_name); | |
3046 | unlock_ref(lock); | |
3047 | return -1; | |
3048 | } | |
93822c22 AW |
3049 | if (write_in_full(lock->lock_fd, sha1_to_hex(sha1), 40) != 40 || |
3050 | write_in_full(lock->lock_fd, &term, 1) != 1 | |
b531394d | 3051 | || close_ref(lock) < 0) { |
c33d5174 | 3052 | error("Couldn't write %s", lock->lk->filename); |
4bd18c43 SP |
3053 | unlock_ref(lock); |
3054 | return -1; | |
3055 | } | |
9da31cb0 | 3056 | clear_loose_ref_cache(&ref_cache); |
bd104db1 NP |
3057 | if (log_ref_write(lock->ref_name, lock->old_sha1, sha1, logmsg) < 0 || |
3058 | (strcmp(lock->ref_name, lock->orig_ref_name) && | |
3059 | log_ref_write(lock->orig_ref_name, lock->old_sha1, sha1, logmsg) < 0)) { | |
6de08ae6 SP |
3060 | unlock_ref(lock); |
3061 | return -1; | |
3062 | } | |
605fac8b NP |
3063 | if (strcmp(lock->orig_ref_name, "HEAD") != 0) { |
3064 | /* | |
3065 | * Special hack: If a branch is updated directly and HEAD | |
3066 | * points to it (may happen on the remote side of a push | |
3067 | * for example) then logically the HEAD reflog should be | |
3068 | * updated too. | |
3069 | * A generic solution implies reverse symref information, | |
3070 | * but finding all symrefs pointing to the given branch | |
3071 | * would be rather costly for this rare event (the direct | |
3072 | * update of a branch) to be worth it. So let's cheat and | |
3073 | * check with HEAD only which should cover 99% of all usage | |
3074 | * scenarios (even 100% of the default ones). | |
3075 | */ | |
3076 | unsigned char head_sha1[20]; | |
3077 | int head_flag; | |
3078 | const char *head_ref; | |
8cad4744 | 3079 | head_ref = resolve_ref_unsafe("HEAD", head_sha1, 1, &head_flag); |
605fac8b NP |
3080 | if (head_ref && (head_flag & REF_ISSYMREF) && |
3081 | !strcmp(head_ref, lock->ref_name)) | |
3082 | log_ref_write("HEAD", lock->old_sha1, sha1, logmsg); | |
3083 | } | |
b531394d | 3084 | if (commit_ref(lock)) { |
434cd0cd | 3085 | error("Couldn't set %s", lock->ref_name); |
4bd18c43 SP |
3086 | unlock_ref(lock); |
3087 | return -1; | |
3088 | } | |
4bd18c43 SP |
3089 | unlock_ref(lock); |
3090 | return 0; | |
95fc7512 | 3091 | } |
d556fae2 | 3092 | |
8b5157e4 NP |
3093 | int create_symref(const char *ref_target, const char *refs_heads_master, |
3094 | const char *logmsg) | |
41b625b0 NP |
3095 | { |
3096 | const char *lockpath; | |
3097 | char ref[1000]; | |
3098 | int fd, len, written; | |
a4f34cbb | 3099 | char *git_HEAD = git_pathdup("%s", ref_target); |
8b5157e4 NP |
3100 | unsigned char old_sha1[20], new_sha1[20]; |
3101 | ||
3102 | if (logmsg && read_ref(ref_target, old_sha1)) | |
3103 | hashclr(old_sha1); | |
41b625b0 | 3104 | |
d48744d1 JH |
3105 | if (safe_create_leading_directories(git_HEAD) < 0) |
3106 | return error("unable to create directory for %s", git_HEAD); | |
3107 | ||
41b625b0 NP |
3108 | #ifndef NO_SYMLINK_HEAD |
3109 | if (prefer_symlink_refs) { | |
3110 | unlink(git_HEAD); | |
3111 | if (!symlink(refs_heads_master, git_HEAD)) | |
8b5157e4 | 3112 | goto done; |
41b625b0 NP |
3113 | fprintf(stderr, "no symlink - falling back to symbolic ref\n"); |
3114 | } | |
3115 | #endif | |
3116 | ||
3117 | len = snprintf(ref, sizeof(ref), "ref: %s\n", refs_heads_master); | |
3118 | if (sizeof(ref) <= len) { | |
3119 | error("refname too long: %s", refs_heads_master); | |
47fc52e2 | 3120 | goto error_free_return; |
41b625b0 NP |
3121 | } |
3122 | lockpath = mkpath("%s.lock", git_HEAD); | |
3123 | fd = open(lockpath, O_CREAT | O_EXCL | O_WRONLY, 0666); | |
3124 | if (fd < 0) { | |
3125 | error("Unable to open %s for writing", lockpath); | |
47fc52e2 | 3126 | goto error_free_return; |
41b625b0 NP |
3127 | } |
3128 | written = write_in_full(fd, ref, len); | |
91c8d590 | 3129 | if (close(fd) != 0 || written != len) { |
41b625b0 | 3130 | error("Unable to write to %s", lockpath); |
47fc52e2 | 3131 | goto error_unlink_return; |
41b625b0 NP |
3132 | } |
3133 | if (rename(lockpath, git_HEAD) < 0) { | |
41b625b0 | 3134 | error("Unable to create %s", git_HEAD); |
47fc52e2 | 3135 | goto error_unlink_return; |
41b625b0 NP |
3136 | } |
3137 | if (adjust_shared_perm(git_HEAD)) { | |
41b625b0 | 3138 | error("Unable to fix permissions on %s", lockpath); |
47fc52e2 | 3139 | error_unlink_return: |
691f1a28 | 3140 | unlink_or_warn(lockpath); |
47fc52e2 JH |
3141 | error_free_return: |
3142 | free(git_HEAD); | |
3143 | return -1; | |
41b625b0 | 3144 | } |
8b5157e4 | 3145 | |
ee96d11b | 3146 | #ifndef NO_SYMLINK_HEAD |
8b5157e4 | 3147 | done: |
ee96d11b | 3148 | #endif |
8b5157e4 NP |
3149 | if (logmsg && !read_ref(refs_heads_master, new_sha1)) |
3150 | log_ref_write(ref_target, old_sha1, new_sha1, logmsg); | |
3151 | ||
47fc52e2 | 3152 | free(git_HEAD); |
41b625b0 NP |
3153 | return 0; |
3154 | } | |
3155 | ||
4207ed28 RS |
3156 | struct read_ref_at_cb { |
3157 | const char *refname; | |
3158 | unsigned long at_time; | |
3159 | int cnt; | |
3160 | int reccnt; | |
3161 | unsigned char *sha1; | |
3162 | int found_it; | |
3163 | ||
3164 | unsigned char osha1[20]; | |
3165 | unsigned char nsha1[20]; | |
3166 | int tz; | |
3167 | unsigned long date; | |
3168 | char **msg; | |
3169 | unsigned long *cutoff_time; | |
3170 | int *cutoff_tz; | |
3171 | int *cutoff_cnt; | |
3172 | }; | |
3173 | ||
3174 | static int read_ref_at_ent(unsigned char *osha1, unsigned char *nsha1, | |
3175 | const char *email, unsigned long timestamp, int tz, | |
3176 | const char *message, void *cb_data) | |
3177 | { | |
3178 | struct read_ref_at_cb *cb = cb_data; | |
3179 | ||
3180 | cb->reccnt++; | |
3181 | cb->tz = tz; | |
3182 | cb->date = timestamp; | |
3183 | ||
3184 | if (timestamp <= cb->at_time || cb->cnt == 0) { | |
3185 | if (cb->msg) | |
3186 | *cb->msg = xstrdup(message); | |
3187 | if (cb->cutoff_time) | |
3188 | *cb->cutoff_time = timestamp; | |
3189 | if (cb->cutoff_tz) | |
3190 | *cb->cutoff_tz = tz; | |
3191 | if (cb->cutoff_cnt) | |
3192 | *cb->cutoff_cnt = cb->reccnt - 1; | |
3193 | /* | |
3194 | * we have not yet updated cb->[n|o]sha1 so they still | |
3195 | * hold the values for the previous record. | |
3196 | */ | |
3197 | if (!is_null_sha1(cb->osha1)) { | |
3198 | hashcpy(cb->sha1, nsha1); | |
3199 | if (hashcmp(cb->osha1, nsha1)) | |
3200 | warning("Log for ref %s has gap after %s.", | |
3201 | cb->refname, show_date(cb->date, cb->tz, DATE_RFC2822)); | |
3202 | } | |
3203 | else if (cb->date == cb->at_time) | |
3204 | hashcpy(cb->sha1, nsha1); | |
3205 | else if (hashcmp(nsha1, cb->sha1)) | |
3206 | warning("Log for ref %s unexpectedly ended on %s.", | |
3207 | cb->refname, show_date(cb->date, cb->tz, | |
3208 | DATE_RFC2822)); | |
3209 | hashcpy(cb->osha1, osha1); | |
3210 | hashcpy(cb->nsha1, nsha1); | |
3211 | cb->found_it = 1; | |
3212 | return 1; | |
3213 | } | |
3214 | hashcpy(cb->osha1, osha1); | |
3215 | hashcpy(cb->nsha1, nsha1); | |
3216 | if (cb->cnt > 0) | |
3217 | cb->cnt--; | |
3218 | return 0; | |
3219 | } | |
3220 | ||
3221 | static int read_ref_at_ent_oldest(unsigned char *osha1, unsigned char *nsha1, | |
3222 | const char *email, unsigned long timestamp, | |
3223 | int tz, const char *message, void *cb_data) | |
3224 | { | |
3225 | struct read_ref_at_cb *cb = cb_data; | |
3226 | ||
3227 | if (cb->msg) | |
3228 | *cb->msg = xstrdup(message); | |
3229 | if (cb->cutoff_time) | |
3230 | *cb->cutoff_time = timestamp; | |
3231 | if (cb->cutoff_tz) | |
3232 | *cb->cutoff_tz = tz; | |
3233 | if (cb->cutoff_cnt) | |
3234 | *cb->cutoff_cnt = cb->reccnt; | |
3235 | hashcpy(cb->sha1, osha1); | |
3236 | if (is_null_sha1(cb->sha1)) | |
3237 | hashcpy(cb->sha1, nsha1); | |
3238 | /* We just want the first entry */ | |
3239 | return 1; | |
16d7cc90 JH |
3240 | } |
3241 | ||
dfefa935 MH |
3242 | int read_ref_at(const char *refname, unsigned long at_time, int cnt, |
3243 | unsigned char *sha1, char **msg, | |
3244 | unsigned long *cutoff_time, int *cutoff_tz, int *cutoff_cnt) | |
d556fae2 | 3245 | { |
4207ed28 | 3246 | struct read_ref_at_cb cb; |
d556fae2 | 3247 | |
4207ed28 RS |
3248 | memset(&cb, 0, sizeof(cb)); |
3249 | cb.refname = refname; | |
3250 | cb.at_time = at_time; | |
3251 | cb.cnt = cnt; | |
3252 | cb.msg = msg; | |
3253 | cb.cutoff_time = cutoff_time; | |
3254 | cb.cutoff_tz = cutoff_tz; | |
3255 | cb.cutoff_cnt = cutoff_cnt; | |
3256 | cb.sha1 = sha1; | |
3257 | ||
3258 | for_each_reflog_ent_reverse(refname, read_ref_at_ent, &cb); | |
3259 | ||
3260 | if (!cb.reccnt) | |
3261 | die("Log for %s is empty.", refname); | |
3262 | if (cb.found_it) | |
3263 | return 0; | |
3264 | ||
3265 | for_each_reflog_ent(refname, read_ref_at_ent_oldest, &cb); | |
d556fae2 | 3266 | |
16d7cc90 | 3267 | return 1; |
d556fae2 | 3268 | } |
2ff81662 | 3269 | |
4da58835 RS |
3270 | int reflog_exists(const char *refname) |
3271 | { | |
3272 | struct stat st; | |
3273 | ||
3274 | return !lstat(git_path("logs/%s", refname), &st) && | |
3275 | S_ISREG(st.st_mode); | |
3276 | } | |
3277 | ||
3278 | int delete_reflog(const char *refname) | |
3279 | { | |
3280 | return remove_path(git_path("logs/%s", refname)); | |
3281 | } | |
3282 | ||
9a7a183b JH |
3283 | static int show_one_reflog_ent(struct strbuf *sb, each_reflog_ent_fn fn, void *cb_data) |
3284 | { | |
3285 | unsigned char osha1[20], nsha1[20]; | |
3286 | char *email_end, *message; | |
3287 | unsigned long timestamp; | |
3288 | int tz; | |
3289 | ||
3290 | /* old SP new SP name <email> SP time TAB msg LF */ | |
3291 | if (sb->len < 83 || sb->buf[sb->len - 1] != '\n' || | |
3292 | get_sha1_hex(sb->buf, osha1) || sb->buf[40] != ' ' || | |
3293 | get_sha1_hex(sb->buf + 41, nsha1) || sb->buf[81] != ' ' || | |
3294 | !(email_end = strchr(sb->buf + 82, '>')) || | |
3295 | email_end[1] != ' ' || | |
3296 | !(timestamp = strtoul(email_end + 2, &message, 10)) || | |
3297 | !message || message[0] != ' ' || | |
3298 | (message[1] != '+' && message[1] != '-') || | |
3299 | !isdigit(message[2]) || !isdigit(message[3]) || | |
3300 | !isdigit(message[4]) || !isdigit(message[5])) | |
3301 | return 0; /* corrupt? */ | |
3302 | email_end[1] = '\0'; | |
3303 | tz = strtol(message + 1, NULL, 10); | |
3304 | if (message[6] != '\t') | |
3305 | message += 6; | |
3306 | else | |
3307 | message += 7; | |
3308 | return fn(osha1, nsha1, sb->buf + 82, timestamp, tz, message, cb_data); | |
3309 | } | |
3310 | ||
98f85ff4 JH |
3311 | static char *find_beginning_of_line(char *bob, char *scan) |
3312 | { | |
3313 | while (bob < scan && *(--scan) != '\n') | |
3314 | ; /* keep scanning backwards */ | |
3315 | /* | |
3316 | * Return either beginning of the buffer, or LF at the end of | |
3317 | * the previous line. | |
3318 | */ | |
3319 | return scan; | |
3320 | } | |
3321 | ||
3322 | int for_each_reflog_ent_reverse(const char *refname, each_reflog_ent_fn fn, void *cb_data) | |
2ff81662 | 3323 | { |
8ca78803 | 3324 | struct strbuf sb = STRBUF_INIT; |
98f85ff4 JH |
3325 | FILE *logfp; |
3326 | long pos; | |
3327 | int ret = 0, at_tail = 1; | |
2ff81662 | 3328 | |
7ae07c1b | 3329 | logfp = fopen(git_path("logs/%s", refname), "r"); |
2ff81662 | 3330 | if (!logfp) |
883d60fa | 3331 | return -1; |
101d15e0 | 3332 | |
98f85ff4 JH |
3333 | /* Jump to the end */ |
3334 | if (fseek(logfp, 0, SEEK_END) < 0) | |
3335 | return error("cannot seek back reflog for %s: %s", | |
3336 | refname, strerror(errno)); | |
3337 | pos = ftell(logfp); | |
3338 | while (!ret && 0 < pos) { | |
3339 | int cnt; | |
3340 | size_t nread; | |
3341 | char buf[BUFSIZ]; | |
3342 | char *endp, *scanp; | |
3343 | ||
3344 | /* Fill next block from the end */ | |
3345 | cnt = (sizeof(buf) < pos) ? sizeof(buf) : pos; | |
3346 | if (fseek(logfp, pos - cnt, SEEK_SET)) | |
3347 | return error("cannot seek back reflog for %s: %s", | |
3348 | refname, strerror(errno)); | |
3349 | nread = fread(buf, cnt, 1, logfp); | |
e4ca819a | 3350 | if (nread != 1) |
98f85ff4 JH |
3351 | return error("cannot read %d bytes from reflog for %s: %s", |
3352 | cnt, refname, strerror(errno)); | |
3353 | pos -= cnt; | |
3354 | ||
3355 | scanp = endp = buf + cnt; | |
3356 | if (at_tail && scanp[-1] == '\n') | |
3357 | /* Looking at the final LF at the end of the file */ | |
3358 | scanp--; | |
3359 | at_tail = 0; | |
3360 | ||
3361 | while (buf < scanp) { | |
3362 | /* | |
3363 | * terminating LF of the previous line, or the beginning | |
3364 | * of the buffer. | |
3365 | */ | |
3366 | char *bp; | |
3367 | ||
3368 | bp = find_beginning_of_line(buf, scanp); | |
3369 | ||
3370 | if (*bp != '\n') { | |
3371 | strbuf_splice(&sb, 0, 0, buf, endp - buf); | |
3372 | if (pos) | |
3373 | break; /* need to fill another block */ | |
3374 | scanp = buf - 1; /* leave loop */ | |
3375 | } else { | |
3376 | /* | |
3377 | * (bp + 1) thru endp is the beginning of the | |
3378 | * current line we have in sb | |
3379 | */ | |
3380 | strbuf_splice(&sb, 0, 0, bp + 1, endp - (bp + 1)); | |
3381 | scanp = bp; | |
3382 | endp = bp + 1; | |
3383 | } | |
3384 | ret = show_one_reflog_ent(&sb, fn, cb_data); | |
3385 | strbuf_reset(&sb); | |
3386 | if (ret) | |
3387 | break; | |
9d33f7c2 | 3388 | } |
101d15e0 | 3389 | |
2ff81662 | 3390 | } |
98f85ff4 | 3391 | if (!ret && sb.len) |
9a7a183b | 3392 | ret = show_one_reflog_ent(&sb, fn, cb_data); |
98f85ff4 | 3393 | |
2ff81662 | 3394 | fclose(logfp); |
8ca78803 | 3395 | strbuf_release(&sb); |
2266bf27 | 3396 | return ret; |
2ff81662 | 3397 | } |
e29cb53a | 3398 | |
dfefa935 | 3399 | int for_each_reflog_ent(const char *refname, each_reflog_ent_fn fn, void *cb_data) |
101d15e0 | 3400 | { |
98f85ff4 JH |
3401 | FILE *logfp; |
3402 | struct strbuf sb = STRBUF_INIT; | |
3403 | int ret = 0; | |
3404 | ||
3405 | logfp = fopen(git_path("logs/%s", refname), "r"); | |
3406 | if (!logfp) | |
3407 | return -1; | |
101d15e0 | 3408 | |
98f85ff4 JH |
3409 | while (!ret && !strbuf_getwholeline(&sb, logfp, '\n')) |
3410 | ret = show_one_reflog_ent(&sb, fn, cb_data); | |
3411 | fclose(logfp); | |
3412 | strbuf_release(&sb); | |
3413 | return ret; | |
3414 | } | |
989c0e5d MH |
3415 | /* |
3416 | * Call fn for each reflog in the namespace indicated by name. name | |
3417 | * must be empty or end with '/'. Name will be used as a scratch | |
3418 | * space, but its contents will be restored before return. | |
3419 | */ | |
3420 | static int do_for_each_reflog(struct strbuf *name, each_ref_fn fn, void *cb_data) | |
eb8381c8 | 3421 | { |
989c0e5d | 3422 | DIR *d = opendir(git_path("logs/%s", name->buf)); |
fcee5a14 | 3423 | int retval = 0; |
93c603fc | 3424 | struct dirent *de; |
989c0e5d | 3425 | int oldlen = name->len; |
eb8381c8 | 3426 | |
93c603fc | 3427 | if (!d) |
989c0e5d | 3428 | return name->len ? errno : 0; |
eb8381c8 | 3429 | |
93c603fc MH |
3430 | while ((de = readdir(d)) != NULL) { |
3431 | struct stat st; | |
eb8381c8 | 3432 | |
93c603fc MH |
3433 | if (de->d_name[0] == '.') |
3434 | continue; | |
2975c770 | 3435 | if (ends_with(de->d_name, ".lock")) |
93c603fc | 3436 | continue; |
989c0e5d MH |
3437 | strbuf_addstr(name, de->d_name); |
3438 | if (stat(git_path("logs/%s", name->buf), &st) < 0) { | |
3439 | ; /* silently ignore */ | |
93c603fc | 3440 | } else { |
eb8381c8 | 3441 | if (S_ISDIR(st.st_mode)) { |
989c0e5d MH |
3442 | strbuf_addch(name, '/'); |
3443 | retval = do_for_each_reflog(name, fn, cb_data); | |
eb8381c8 NP |
3444 | } else { |
3445 | unsigned char sha1[20]; | |
989c0e5d MH |
3446 | if (read_ref_full(name->buf, sha1, 0, NULL)) |
3447 | retval = error("bad ref for %s", name->buf); | |
eb8381c8 | 3448 | else |
989c0e5d | 3449 | retval = fn(name->buf, sha1, 0, cb_data); |
eb8381c8 NP |
3450 | } |
3451 | if (retval) | |
3452 | break; | |
3453 | } | |
989c0e5d | 3454 | strbuf_setlen(name, oldlen); |
eb8381c8 | 3455 | } |
93c603fc | 3456 | closedir(d); |
eb8381c8 NP |
3457 | return retval; |
3458 | } | |
3459 | ||
3460 | int for_each_reflog(each_ref_fn fn, void *cb_data) | |
3461 | { | |
989c0e5d MH |
3462 | int retval; |
3463 | struct strbuf name; | |
3464 | strbuf_init(&name, PATH_MAX); | |
3465 | retval = do_for_each_reflog(&name, fn, cb_data); | |
3466 | strbuf_release(&name); | |
3467 | return retval; | |
eb8381c8 | 3468 | } |
3d9f037c | 3469 | |
4738a333 BK |
3470 | static struct ref_lock *update_ref_lock(const char *refname, |
3471 | const unsigned char *oldval, | |
3472 | int flags, int *type_p, | |
3473 | enum action_on_err onerr) | |
3d9f037c | 3474 | { |
4738a333 BK |
3475 | struct ref_lock *lock; |
3476 | lock = lock_any_ref_for_update(refname, oldval, flags, type_p); | |
3d9f037c CR |
3477 | if (!lock) { |
3478 | const char *str = "Cannot lock the ref '%s'."; | |
3479 | switch (onerr) { | |
f4124112 MH |
3480 | case UPDATE_REFS_MSG_ON_ERR: error(str, refname); break; |
3481 | case UPDATE_REFS_DIE_ON_ERR: die(str, refname); break; | |
3482 | case UPDATE_REFS_QUIET_ON_ERR: break; | |
3d9f037c | 3483 | } |
3d9f037c | 3484 | } |
4738a333 BK |
3485 | return lock; |
3486 | } | |
3487 | ||
3488 | static int update_ref_write(const char *action, const char *refname, | |
3489 | const unsigned char *sha1, struct ref_lock *lock, | |
3490 | enum action_on_err onerr) | |
3491 | { | |
3d9f037c CR |
3492 | if (write_ref_sha1(lock, sha1, action) < 0) { |
3493 | const char *str = "Cannot update the ref '%s'."; | |
3494 | switch (onerr) { | |
f4124112 MH |
3495 | case UPDATE_REFS_MSG_ON_ERR: error(str, refname); break; |
3496 | case UPDATE_REFS_DIE_ON_ERR: die(str, refname); break; | |
3497 | case UPDATE_REFS_QUIET_ON_ERR: break; | |
3d9f037c CR |
3498 | } |
3499 | return 1; | |
3500 | } | |
3501 | return 0; | |
3502 | } | |
cda69f48 | 3503 | |
b5c8ea2a MH |
3504 | /** |
3505 | * Information needed for a single ref update. Set new_sha1 to the | |
3506 | * new value or to zero to delete the ref. To check the old value | |
3507 | * while locking the ref, set have_old to 1 and set old_sha1 to the | |
3508 | * value or to zero to ensure the ref does not exist before update. | |
3509 | */ | |
3510 | struct ref_update { | |
b5c8ea2a MH |
3511 | unsigned char new_sha1[20]; |
3512 | unsigned char old_sha1[20]; | |
3513 | int flags; /* REF_NODEREF? */ | |
3514 | int have_old; /* 1 if old_sha1 is valid, 0 otherwise */ | |
81c960e4 | 3515 | struct ref_lock *lock; |
84178db7 | 3516 | int type; |
88615910 | 3517 | const char refname[FLEX_ARRAY]; |
b5c8ea2a MH |
3518 | }; |
3519 | ||
caa4046c MH |
3520 | /* |
3521 | * Data structure for holding a reference transaction, which can | |
3522 | * consist of checks and updates to multiple references, carried out | |
3523 | * as atomically as possible. This structure is opaque to callers. | |
3524 | */ | |
3525 | struct ref_transaction { | |
3526 | struct ref_update **updates; | |
3527 | size_t alloc; | |
3528 | size_t nr; | |
3529 | }; | |
3530 | ||
3531 | struct ref_transaction *ref_transaction_begin(void) | |
3532 | { | |
3533 | return xcalloc(1, sizeof(struct ref_transaction)); | |
3534 | } | |
3535 | ||
3536 | static void ref_transaction_free(struct ref_transaction *transaction) | |
3537 | { | |
3538 | int i; | |
3539 | ||
88615910 MH |
3540 | for (i = 0; i < transaction->nr; i++) |
3541 | free(transaction->updates[i]); | |
caa4046c MH |
3542 | |
3543 | free(transaction->updates); | |
3544 | free(transaction); | |
3545 | } | |
3546 | ||
3547 | void ref_transaction_rollback(struct ref_transaction *transaction) | |
3548 | { | |
3549 | ref_transaction_free(transaction); | |
3550 | } | |
3551 | ||
3552 | static struct ref_update *add_update(struct ref_transaction *transaction, | |
3553 | const char *refname) | |
3554 | { | |
88615910 MH |
3555 | size_t len = strlen(refname); |
3556 | struct ref_update *update = xcalloc(1, sizeof(*update) + len + 1); | |
caa4046c | 3557 | |
88615910 | 3558 | strcpy((char *)update->refname, refname); |
caa4046c MH |
3559 | ALLOC_GROW(transaction->updates, transaction->nr + 1, transaction->alloc); |
3560 | transaction->updates[transaction->nr++] = update; | |
3561 | return update; | |
3562 | } | |
3563 | ||
3564 | void ref_transaction_update(struct ref_transaction *transaction, | |
3565 | const char *refname, | |
3566 | unsigned char *new_sha1, unsigned char *old_sha1, | |
3567 | int flags, int have_old) | |
3568 | { | |
3569 | struct ref_update *update = add_update(transaction, refname); | |
3570 | ||
3571 | hashcpy(update->new_sha1, new_sha1); | |
3572 | update->flags = flags; | |
3573 | update->have_old = have_old; | |
3574 | if (have_old) | |
3575 | hashcpy(update->old_sha1, old_sha1); | |
3576 | } | |
3577 | ||
3578 | void ref_transaction_create(struct ref_transaction *transaction, | |
3579 | const char *refname, | |
3580 | unsigned char *new_sha1, | |
3581 | int flags) | |
3582 | { | |
3583 | struct ref_update *update = add_update(transaction, refname); | |
3584 | ||
3585 | assert(!is_null_sha1(new_sha1)); | |
3586 | hashcpy(update->new_sha1, new_sha1); | |
3587 | hashclr(update->old_sha1); | |
3588 | update->flags = flags; | |
3589 | update->have_old = 1; | |
3590 | } | |
3591 | ||
3592 | void ref_transaction_delete(struct ref_transaction *transaction, | |
3593 | const char *refname, | |
3594 | unsigned char *old_sha1, | |
3595 | int flags, int have_old) | |
3596 | { | |
3597 | struct ref_update *update = add_update(transaction, refname); | |
3598 | ||
3599 | update->flags = flags; | |
3600 | update->have_old = have_old; | |
3601 | if (have_old) { | |
3602 | assert(!is_null_sha1(old_sha1)); | |
3603 | hashcpy(update->old_sha1, old_sha1); | |
3604 | } | |
3605 | } | |
3606 | ||
4738a333 BK |
3607 | int update_ref(const char *action, const char *refname, |
3608 | const unsigned char *sha1, const unsigned char *oldval, | |
3609 | int flags, enum action_on_err onerr) | |
3610 | { | |
3611 | struct ref_lock *lock; | |
ce1e8462 | 3612 | lock = update_ref_lock(refname, oldval, flags, NULL, onerr); |
4738a333 BK |
3613 | if (!lock) |
3614 | return 1; | |
3615 | return update_ref_write(action, refname, sha1, lock, onerr); | |
3616 | } | |
3617 | ||
98aee92d BK |
3618 | static int ref_update_compare(const void *r1, const void *r2) |
3619 | { | |
3620 | const struct ref_update * const *u1 = r1; | |
3621 | const struct ref_update * const *u2 = r2; | |
5524e241 | 3622 | return strcmp((*u1)->refname, (*u2)->refname); |
98aee92d BK |
3623 | } |
3624 | ||
3625 | static int ref_update_reject_duplicates(struct ref_update **updates, int n, | |
3626 | enum action_on_err onerr) | |
3627 | { | |
3628 | int i; | |
3629 | for (i = 1; i < n; i++) | |
5524e241 | 3630 | if (!strcmp(updates[i - 1]->refname, updates[i]->refname)) { |
98aee92d BK |
3631 | const char *str = |
3632 | "Multiple updates for ref '%s' not allowed."; | |
3633 | switch (onerr) { | |
f4124112 | 3634 | case UPDATE_REFS_MSG_ON_ERR: |
5524e241 | 3635 | error(str, updates[i]->refname); break; |
f4124112 | 3636 | case UPDATE_REFS_DIE_ON_ERR: |
5524e241 | 3637 | die(str, updates[i]->refname); break; |
f4124112 | 3638 | case UPDATE_REFS_QUIET_ON_ERR: |
98aee92d BK |
3639 | break; |
3640 | } | |
3641 | return 1; | |
3642 | } | |
3643 | return 0; | |
3644 | } | |
3645 | ||
b5c8ea2a MH |
3646 | int ref_transaction_commit(struct ref_transaction *transaction, |
3647 | const char *msg, enum action_on_err onerr) | |
98aee92d BK |
3648 | { |
3649 | int ret = 0, delnum = 0, i; | |
98aee92d | 3650 | const char **delnames; |
b5c8ea2a | 3651 | int n = transaction->nr; |
6a402338 | 3652 | struct ref_update **updates = transaction->updates; |
98aee92d | 3653 | |
b5c8ea2a | 3654 | if (!n) |
98aee92d BK |
3655 | return 0; |
3656 | ||
3657 | /* Allocate work space */ | |
98aee92d BK |
3658 | delnames = xmalloc(sizeof(*delnames) * n); |
3659 | ||
3660 | /* Copy, sort, and reject duplicate refs */ | |
98aee92d BK |
3661 | qsort(updates, n, sizeof(*updates), ref_update_compare); |
3662 | ret = ref_update_reject_duplicates(updates, n, onerr); | |
3663 | if (ret) | |
3664 | goto cleanup; | |
3665 | ||
3666 | /* Acquire all locks while verifying old values */ | |
3667 | for (i = 0; i < n; i++) { | |
cb198d21 MH |
3668 | struct ref_update *update = updates[i]; |
3669 | ||
81c960e4 MH |
3670 | update->lock = update_ref_lock(update->refname, |
3671 | (update->have_old ? | |
3672 | update->old_sha1 : NULL), | |
3673 | update->flags, | |
84178db7 | 3674 | &update->type, onerr); |
81c960e4 | 3675 | if (!update->lock) { |
98aee92d BK |
3676 | ret = 1; |
3677 | goto cleanup; | |
3678 | } | |
3679 | } | |
3680 | ||
3681 | /* Perform updates first so live commits remain referenced */ | |
cb198d21 MH |
3682 | for (i = 0; i < n; i++) { |
3683 | struct ref_update *update = updates[i]; | |
3684 | ||
3685 | if (!is_null_sha1(update->new_sha1)) { | |
b5c8ea2a | 3686 | ret = update_ref_write(msg, |
cb198d21 MH |
3687 | update->refname, |
3688 | update->new_sha1, | |
81c960e4 MH |
3689 | update->lock, onerr); |
3690 | update->lock = NULL; /* freed by update_ref_write */ | |
98aee92d BK |
3691 | if (ret) |
3692 | goto cleanup; | |
3693 | } | |
cb198d21 | 3694 | } |
98aee92d BK |
3695 | |
3696 | /* Perform deletes now that updates are safely completed */ | |
81c960e4 MH |
3697 | for (i = 0; i < n; i++) { |
3698 | struct ref_update *update = updates[i]; | |
3699 | ||
3700 | if (update->lock) { | |
3701 | delnames[delnum++] = update->lock->ref_name; | |
84178db7 | 3702 | ret |= delete_ref_loose(update->lock, update->type); |
98aee92d | 3703 | } |
81c960e4 MH |
3704 | } |
3705 | ||
98aee92d BK |
3706 | ret |= repack_without_refs(delnames, delnum); |
3707 | for (i = 0; i < delnum; i++) | |
3708 | unlink_or_warn(git_path("logs/%s", delnames[i])); | |
3709 | clear_loose_ref_cache(&ref_cache); | |
3710 | ||
3711 | cleanup: | |
3712 | for (i = 0; i < n; i++) | |
81c960e4 MH |
3713 | if (updates[i]->lock) |
3714 | unlock_ref(updates[i]->lock); | |
98aee92d | 3715 | free(delnames); |
caa4046c MH |
3716 | ref_transaction_free(transaction); |
3717 | return ret; | |
3718 | } | |
3719 | ||
dfefa935 | 3720 | char *shorten_unambiguous_ref(const char *refname, int strict) |
7c2b3029 JK |
3721 | { |
3722 | int i; | |
3723 | static char **scanf_fmts; | |
3724 | static int nr_rules; | |
3725 | char *short_name; | |
3726 | ||
7c2b3029 | 3727 | if (!nr_rules) { |
4346663a MH |
3728 | /* |
3729 | * Pre-generate scanf formats from ref_rev_parse_rules[]. | |
3730 | * Generate a format suitable for scanf from a | |
3731 | * ref_rev_parse_rules rule by interpolating "%s" at the | |
3732 | * location of the "%.*s". | |
3733 | */ | |
7c2b3029 | 3734 | size_t total_len = 0; |
84d5633f | 3735 | size_t offset = 0; |
7c2b3029 JK |
3736 | |
3737 | /* the rule list is NULL terminated, count them first */ | |
a4165851 | 3738 | for (nr_rules = 0; ref_rev_parse_rules[nr_rules]; nr_rules++) |
7902fe03 MH |
3739 | /* -2 for strlen("%.*s") - strlen("%s"); +1 for NUL */ |
3740 | total_len += strlen(ref_rev_parse_rules[nr_rules]) - 2 + 1; | |
7c2b3029 JK |
3741 | |
3742 | scanf_fmts = xmalloc(nr_rules * sizeof(char *) + total_len); | |
3743 | ||
84d5633f | 3744 | offset = 0; |
7c2b3029 | 3745 | for (i = 0; i < nr_rules; i++) { |
4346663a | 3746 | assert(offset < total_len); |
84d5633f | 3747 | scanf_fmts[i] = (char *)&scanf_fmts[nr_rules] + offset; |
4346663a MH |
3748 | offset += snprintf(scanf_fmts[i], total_len - offset, |
3749 | ref_rev_parse_rules[i], 2, "%s") + 1; | |
7c2b3029 JK |
3750 | } |
3751 | } | |
3752 | ||
3753 | /* bail out if there are no rules */ | |
3754 | if (!nr_rules) | |
dfefa935 | 3755 | return xstrdup(refname); |
7c2b3029 | 3756 | |
dfefa935 MH |
3757 | /* buffer for scanf result, at most refname must fit */ |
3758 | short_name = xstrdup(refname); | |
7c2b3029 JK |
3759 | |
3760 | /* skip first rule, it will always match */ | |
3761 | for (i = nr_rules - 1; i > 0 ; --i) { | |
3762 | int j; | |
6e7b3309 | 3763 | int rules_to_fail = i; |
7c2b3029 JK |
3764 | int short_name_len; |
3765 | ||
dfefa935 | 3766 | if (1 != sscanf(refname, scanf_fmts[i], short_name)) |
7c2b3029 JK |
3767 | continue; |
3768 | ||
3769 | short_name_len = strlen(short_name); | |
3770 | ||
6e7b3309 BW |
3771 | /* |
3772 | * in strict mode, all (except the matched one) rules | |
3773 | * must fail to resolve to a valid non-ambiguous ref | |
3774 | */ | |
3775 | if (strict) | |
3776 | rules_to_fail = nr_rules; | |
3777 | ||
7c2b3029 JK |
3778 | /* |
3779 | * check if the short name resolves to a valid ref, | |
3780 | * but use only rules prior to the matched one | |
3781 | */ | |
6e7b3309 | 3782 | for (j = 0; j < rules_to_fail; j++) { |
7c2b3029 | 3783 | const char *rule = ref_rev_parse_rules[j]; |
7c2b3029 JK |
3784 | char refname[PATH_MAX]; |
3785 | ||
6e7b3309 BW |
3786 | /* skip matched rule */ |
3787 | if (i == j) | |
3788 | continue; | |
3789 | ||
7c2b3029 JK |
3790 | /* |
3791 | * the short name is ambiguous, if it resolves | |
3792 | * (with this previous rule) to a valid ref | |
3793 | * read_ref() returns 0 on success | |
3794 | */ | |
3795 | mksnpath(refname, sizeof(refname), | |
3796 | rule, short_name_len, short_name); | |
c6893323 | 3797 | if (ref_exists(refname)) |
7c2b3029 JK |
3798 | break; |
3799 | } | |
3800 | ||
3801 | /* | |
3802 | * short name is non-ambiguous if all previous rules | |
3803 | * haven't resolved to a valid ref | |
3804 | */ | |
6e7b3309 | 3805 | if (j == rules_to_fail) |
7c2b3029 JK |
3806 | return short_name; |
3807 | } | |
3808 | ||
3809 | free(short_name); | |
dfefa935 | 3810 | return xstrdup(refname); |
7c2b3029 | 3811 | } |
daebaa78 JH |
3812 | |
3813 | static struct string_list *hide_refs; | |
3814 | ||
3815 | int parse_hide_refs_config(const char *var, const char *value, const char *section) | |
3816 | { | |
3817 | if (!strcmp("transfer.hiderefs", var) || | |
3818 | /* NEEDSWORK: use parse_config_key() once both are merged */ | |
59556548 | 3819 | (starts_with(var, section) && var[strlen(section)] == '.' && |
daebaa78 JH |
3820 | !strcmp(var + strlen(section), ".hiderefs"))) { |
3821 | char *ref; | |
3822 | int len; | |
3823 | ||
3824 | if (!value) | |
3825 | return config_error_nonbool(var); | |
3826 | ref = xstrdup(value); | |
3827 | len = strlen(ref); | |
3828 | while (len && ref[len - 1] == '/') | |
3829 | ref[--len] = '\0'; | |
3830 | if (!hide_refs) { | |
3831 | hide_refs = xcalloc(1, sizeof(*hide_refs)); | |
3832 | hide_refs->strdup_strings = 1; | |
3833 | } | |
3834 | string_list_append(hide_refs, ref); | |
3835 | } | |
3836 | return 0; | |
3837 | } | |
3838 | ||
3839 | int ref_is_hidden(const char *refname) | |
3840 | { | |
3841 | struct string_list_item *item; | |
3842 | ||
3843 | if (!hide_refs) | |
3844 | return 0; | |
3845 | for_each_string_list_item(item, hide_refs) { | |
3846 | int len; | |
59556548 | 3847 | if (!starts_with(refname, item->string)) |
daebaa78 JH |
3848 | continue; |
3849 | len = strlen(item->string); | |
3850 | if (!refname[len] || refname[len] == '/') | |
3851 | return 1; | |
3852 | } | |
3853 | return 0; | |
3854 | } |