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Commit | Line | Data |
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0fcfd160 LT |
1 | /* |
2 | * GIT - The information manager from hell | |
3 | * | |
4 | * Copyright (C) Linus Torvalds, 2005 | |
5 | * | |
6 | * This handles basic git sha1 object files - packing, unpacking, | |
7 | * creation etc. | |
8 | */ | |
0fcfd160 | 9 | #include "cache.h" |
1f688557 | 10 | #include "delta.h" |
a733cb60 | 11 | #include "pack.h" |
8e440259 PE |
12 | #include "blob.h" |
13 | #include "commit.h" | |
14 | #include "tag.h" | |
15 | #include "tree.h" | |
0fcfd160 | 16 | |
144bde78 LT |
17 | #ifndef O_NOATIME |
18 | #if defined(__linux__) && (defined(__i386__) || defined(__PPC__)) | |
19 | #define O_NOATIME 01000000 | |
20 | #else | |
21 | #define O_NOATIME 0 | |
22 | #endif | |
23 | #endif | |
24 | ||
e05db0fd PR |
25 | #ifdef NO_C99_FORMAT |
26 | #define SZ_FMT "lu" | |
27 | #else | |
28 | #define SZ_FMT "zu" | |
29 | #endif | |
30 | ||
96f1e58f | 31 | const unsigned char null_sha1[20]; |
88cd621d | 32 | |
144bde78 LT |
33 | static unsigned int sha1_file_open_flag = O_NOATIME; |
34 | ||
e49521b5 JH |
35 | signed char hexval_table[256] = { |
36 | -1, -1, -1, -1, -1, -1, -1, -1, /* 00-07 */ | |
37 | -1, -1, -1, -1, -1, -1, -1, -1, /* 08-0f */ | |
38 | -1, -1, -1, -1, -1, -1, -1, -1, /* 10-17 */ | |
39 | -1, -1, -1, -1, -1, -1, -1, -1, /* 18-1f */ | |
40 | -1, -1, -1, -1, -1, -1, -1, -1, /* 20-27 */ | |
41 | -1, -1, -1, -1, -1, -1, -1, -1, /* 28-2f */ | |
42 | 0, 1, 2, 3, 4, 5, 6, 7, /* 30-37 */ | |
43 | 8, 9, -1, -1, -1, -1, -1, -1, /* 38-3f */ | |
44 | -1, 10, 11, 12, 13, 14, 15, -1, /* 40-47 */ | |
45 | -1, -1, -1, -1, -1, -1, -1, -1, /* 48-4f */ | |
46 | -1, -1, -1, -1, -1, -1, -1, -1, /* 50-57 */ | |
47 | -1, -1, -1, -1, -1, -1, -1, -1, /* 58-5f */ | |
48 | -1, 10, 11, 12, 13, 14, 15, -1, /* 60-67 */ | |
49 | -1, -1, -1, -1, -1, -1, -1, -1, /* 68-67 */ | |
50 | -1, -1, -1, -1, -1, -1, -1, -1, /* 70-77 */ | |
51 | -1, -1, -1, -1, -1, -1, -1, -1, /* 78-7f */ | |
52 | -1, -1, -1, -1, -1, -1, -1, -1, /* 80-87 */ | |
53 | -1, -1, -1, -1, -1, -1, -1, -1, /* 88-8f */ | |
54 | -1, -1, -1, -1, -1, -1, -1, -1, /* 90-97 */ | |
55 | -1, -1, -1, -1, -1, -1, -1, -1, /* 98-9f */ | |
56 | -1, -1, -1, -1, -1, -1, -1, -1, /* a0-a7 */ | |
57 | -1, -1, -1, -1, -1, -1, -1, -1, /* a8-af */ | |
58 | -1, -1, -1, -1, -1, -1, -1, -1, /* b0-b7 */ | |
59 | -1, -1, -1, -1, -1, -1, -1, -1, /* b8-bf */ | |
60 | -1, -1, -1, -1, -1, -1, -1, -1, /* c0-c7 */ | |
61 | -1, -1, -1, -1, -1, -1, -1, -1, /* c8-cf */ | |
62 | -1, -1, -1, -1, -1, -1, -1, -1, /* d0-d7 */ | |
63 | -1, -1, -1, -1, -1, -1, -1, -1, /* d8-df */ | |
64 | -1, -1, -1, -1, -1, -1, -1, -1, /* e0-e7 */ | |
65 | -1, -1, -1, -1, -1, -1, -1, -1, /* e8-ef */ | |
66 | -1, -1, -1, -1, -1, -1, -1, -1, /* f0-f7 */ | |
67 | -1, -1, -1, -1, -1, -1, -1, -1, /* f8-ff */ | |
68 | }; | |
0fcfd160 LT |
69 | |
70 | int get_sha1_hex(const char *hex, unsigned char *sha1) | |
71 | { | |
72 | int i; | |
73 | for (i = 0; i < 20; i++) { | |
74 | unsigned int val = (hexval(hex[0]) << 4) | hexval(hex[1]); | |
75 | if (val & ~0xff) | |
76 | return -1; | |
77 | *sha1++ = val; | |
78 | hex += 2; | |
79 | } | |
80 | return 0; | |
81 | } | |
82 | ||
b2cb9425 JH |
83 | int safe_create_leading_directories(char *path) |
84 | { | |
85 | char *pos = path; | |
67d42212 JR |
86 | struct stat st; |
87 | ||
67ffdf4c JS |
88 | if (*pos == '/') |
89 | pos++; | |
b2cb9425 JH |
90 | |
91 | while (pos) { | |
92 | pos = strchr(pos, '/'); | |
93 | if (!pos) | |
94 | break; | |
95 | *pos = 0; | |
67d42212 JR |
96 | if (!stat(path, &st)) { |
97 | /* path exists */ | |
98 | if (!S_ISDIR(st.st_mode)) { | |
b2cb9425 | 99 | *pos = '/'; |
67d42212 | 100 | return -3; |
b2cb9425 | 101 | } |
457f06d6 | 102 | } |
67d42212 JR |
103 | else if (mkdir(path, 0777)) { |
104 | *pos = '/'; | |
105 | return -1; | |
106 | } | |
457f06d6 JS |
107 | else if (adjust_shared_perm(path)) { |
108 | *pos = '/'; | |
109 | return -2; | |
110 | } | |
b2cb9425 JH |
111 | *pos++ = '/'; |
112 | } | |
113 | return 0; | |
114 | } | |
723c31fe | 115 | |
0fcfd160 LT |
116 | char * sha1_to_hex(const unsigned char *sha1) |
117 | { | |
dcb3450f LT |
118 | static int bufno; |
119 | static char hexbuffer[4][50]; | |
0fcfd160 | 120 | static const char hex[] = "0123456789abcdef"; |
dcb3450f | 121 | char *buffer = hexbuffer[3 & ++bufno], *buf = buffer; |
0fcfd160 LT |
122 | int i; |
123 | ||
124 | for (i = 0; i < 20; i++) { | |
125 | unsigned int val = *sha1++; | |
126 | *buf++ = hex[val >> 4]; | |
127 | *buf++ = hex[val & 0xf]; | |
128 | } | |
1e80e044 JS |
129 | *buf = '\0'; |
130 | ||
0fcfd160 LT |
131 | return buffer; |
132 | } | |
133 | ||
ace1534d JH |
134 | static void fill_sha1_path(char *pathbuf, const unsigned char *sha1) |
135 | { | |
136 | int i; | |
137 | for (i = 0; i < 20; i++) { | |
138 | static char hex[] = "0123456789abcdef"; | |
139 | unsigned int val = sha1[i]; | |
140 | char *pos = pathbuf + i*2 + (i > 0); | |
141 | *pos++ = hex[val >> 4]; | |
142 | *pos = hex[val & 0xf]; | |
143 | } | |
144 | } | |
145 | ||
0fcfd160 LT |
146 | /* |
147 | * NOTE! This returns a statically allocated buffer, so you have to be | |
9befac47 | 148 | * careful about using it. Do a "xstrdup()" if you need to save the |
0fcfd160 | 149 | * filename. |
ace1534d JH |
150 | * |
151 | * Also note that this returns the location for creating. Reading | |
152 | * SHA1 file can happen from any alternate directory listed in the | |
d19938ab | 153 | * DB_ENVIRONMENT environment variable if it is not found in |
ace1534d | 154 | * the primary object database. |
0fcfd160 LT |
155 | */ |
156 | char *sha1_file_name(const unsigned char *sha1) | |
157 | { | |
0fcfd160 LT |
158 | static char *name, *base; |
159 | ||
160 | if (!base) { | |
d19938ab | 161 | const char *sha1_file_directory = get_object_directory(); |
0fcfd160 | 162 | int len = strlen(sha1_file_directory); |
812666c8 | 163 | base = xmalloc(len + 60); |
0fcfd160 LT |
164 | memcpy(base, sha1_file_directory, len); |
165 | memset(base+len, 0, 60); | |
166 | base[len] = '/'; | |
167 | base[len+3] = '/'; | |
168 | name = base + len + 1; | |
169 | } | |
ace1534d | 170 | fill_sha1_path(name, sha1); |
0fcfd160 LT |
171 | return base; |
172 | } | |
173 | ||
bf592c50 DB |
174 | char *sha1_pack_name(const unsigned char *sha1) |
175 | { | |
176 | static const char hex[] = "0123456789abcdef"; | |
177 | static char *name, *base, *buf; | |
178 | int i; | |
179 | ||
180 | if (!base) { | |
181 | const char *sha1_file_directory = get_object_directory(); | |
182 | int len = strlen(sha1_file_directory); | |
183 | base = xmalloc(len + 60); | |
184 | sprintf(base, "%s/pack/pack-1234567890123456789012345678901234567890.pack", sha1_file_directory); | |
185 | name = base + len + 11; | |
186 | } | |
187 | ||
188 | buf = name; | |
189 | ||
190 | for (i = 0; i < 20; i++) { | |
191 | unsigned int val = *sha1++; | |
192 | *buf++ = hex[val >> 4]; | |
193 | *buf++ = hex[val & 0xf]; | |
194 | } | |
195 | ||
196 | return base; | |
197 | } | |
198 | ||
199 | char *sha1_pack_index_name(const unsigned char *sha1) | |
200 | { | |
201 | static const char hex[] = "0123456789abcdef"; | |
202 | static char *name, *base, *buf; | |
203 | int i; | |
204 | ||
205 | if (!base) { | |
206 | const char *sha1_file_directory = get_object_directory(); | |
207 | int len = strlen(sha1_file_directory); | |
208 | base = xmalloc(len + 60); | |
209 | sprintf(base, "%s/pack/pack-1234567890123456789012345678901234567890.idx", sha1_file_directory); | |
210 | name = base + len + 11; | |
211 | } | |
212 | ||
213 | buf = name; | |
214 | ||
215 | for (i = 0; i < 20; i++) { | |
216 | unsigned int val = *sha1++; | |
217 | *buf++ = hex[val >> 4]; | |
218 | *buf++ = hex[val & 0xf]; | |
219 | } | |
220 | ||
221 | return base; | |
222 | } | |
223 | ||
d5a63b99 JH |
224 | struct alternate_object_database *alt_odb_list; |
225 | static struct alternate_object_database **alt_odb_tail; | |
ace1534d | 226 | |
c2f493a4 MW |
227 | static void read_info_alternates(const char * alternates, int depth); |
228 | ||
ddd5d056 JH |
229 | /* |
230 | * Prepare alternate object database registry. | |
d5a63b99 JH |
231 | * |
232 | * The variable alt_odb_list points at the list of struct | |
233 | * alternate_object_database. The elements on this list come from | |
234 | * non-empty elements from colon separated ALTERNATE_DB_ENVIRONMENT | |
235 | * environment variable, and $GIT_OBJECT_DIRECTORY/info/alternates, | |
1494e038 JH |
236 | * whose contents is similar to that environment variable but can be |
237 | * LF separated. Its base points at a statically allocated buffer that | |
d5a63b99 JH |
238 | * contains "/the/directory/corresponding/to/.git/objects/...", while |
239 | * its name points just after the slash at the end of ".git/objects/" | |
240 | * in the example above, and has enough space to hold 40-byte hex | |
241 | * SHA1, an extra slash for the first level indirection, and the | |
242 | * terminating NUL. | |
ddd5d056 | 243 | */ |
c2f493a4 | 244 | static int link_alt_odb_entry(const char * entry, int len, const char * relative_base, int depth) |
ace1534d | 245 | { |
c2f493a4 | 246 | struct stat st; |
1494e038 | 247 | const char *objdir = get_object_directory(); |
c2f493a4 MW |
248 | struct alternate_object_database *ent; |
249 | struct alternate_object_database *alt; | |
250 | /* 43 = 40-byte + 2 '/' + terminating NUL */ | |
251 | int pfxlen = len; | |
252 | int entlen = pfxlen + 43; | |
ccfd3e99 | 253 | int base_len = -1; |
d5a63b99 | 254 | |
c2f493a4 MW |
255 | if (*entry != '/' && relative_base) { |
256 | /* Relative alt-odb */ | |
257 | if (base_len < 0) | |
258 | base_len = strlen(relative_base) + 1; | |
259 | entlen += base_len; | |
260 | pfxlen += base_len; | |
261 | } | |
262 | ent = xmalloc(sizeof(*ent) + entlen); | |
263 | ||
264 | if (*entry != '/' && relative_base) { | |
265 | memcpy(ent->base, relative_base, base_len - 1); | |
266 | ent->base[base_len - 1] = '/'; | |
267 | memcpy(ent->base + base_len, entry, len); | |
268 | } | |
269 | else | |
270 | memcpy(ent->base, entry, pfxlen); | |
271 | ||
272 | ent->name = ent->base + pfxlen + 1; | |
273 | ent->base[pfxlen + 3] = '/'; | |
274 | ent->base[pfxlen] = ent->base[entlen-1] = 0; | |
275 | ||
276 | /* Detect cases where alternate disappeared */ | |
277 | if (stat(ent->base, &st) || !S_ISDIR(st.st_mode)) { | |
278 | error("object directory %s does not exist; " | |
279 | "check .git/objects/info/alternates.", | |
280 | ent->base); | |
281 | free(ent); | |
282 | return -1; | |
283 | } | |
284 | ||
285 | /* Prevent the common mistake of listing the same | |
286 | * thing twice, or object directory itself. | |
287 | */ | |
288 | for (alt = alt_odb_list; alt; alt = alt->next) { | |
289 | if (!memcmp(ent->base, alt->base, pfxlen)) { | |
290 | free(ent); | |
291 | return -1; | |
292 | } | |
293 | } | |
294 | if (!memcmp(ent->base, objdir, pfxlen)) { | |
295 | free(ent); | |
296 | return -1; | |
297 | } | |
298 | ||
299 | /* add the alternate entry */ | |
300 | *alt_odb_tail = ent; | |
301 | alt_odb_tail = &(ent->next); | |
302 | ent->next = NULL; | |
303 | ||
304 | /* recursively add alternates */ | |
305 | read_info_alternates(ent->base, depth + 1); | |
306 | ||
307 | ent->base[pfxlen] = '/'; | |
308 | ||
309 | return 0; | |
310 | } | |
311 | ||
312 | static void link_alt_odb_entries(const char *alt, const char *ep, int sep, | |
313 | const char *relative_base, int depth) | |
314 | { | |
315 | const char *cp, *last; | |
316 | ||
317 | if (depth > 5) { | |
318 | error("%s: ignoring alternate object stores, nesting too deep.", | |
319 | relative_base); | |
320 | return; | |
321 | } | |
322 | ||
d5a63b99 | 323 | last = alt; |
9577e7e3 JH |
324 | while (last < ep) { |
325 | cp = last; | |
326 | if (cp < ep && *cp == '#') { | |
327 | while (cp < ep && *cp != sep) | |
328 | cp++; | |
329 | last = cp + 1; | |
330 | continue; | |
331 | } | |
c2f493a4 MW |
332 | while (cp < ep && *cp != sep) |
333 | cp++; | |
d5a63b99 | 334 | if (last != cp) { |
c2f493a4 MW |
335 | if ((*last != '/') && depth) { |
336 | error("%s: ignoring relative alternate object store %s", | |
337 | relative_base, last); | |
338 | } else { | |
339 | link_alt_odb_entry(last, cp - last, | |
340 | relative_base, depth); | |
1494e038 | 341 | } |
d5a63b99 | 342 | } |
9577e7e3 | 343 | while (cp < ep && *cp == sep) |
d5a63b99 JH |
344 | cp++; |
345 | last = cp; | |
9577e7e3 | 346 | } |
d5a63b99 JH |
347 | } |
348 | ||
c2f493a4 | 349 | static void read_info_alternates(const char * relative_base, int depth) |
d5a63b99 | 350 | { |
9577e7e3 | 351 | char *map; |
d5a63b99 | 352 | struct stat st; |
c2f493a4 MW |
353 | char path[PATH_MAX]; |
354 | int fd; | |
d5a63b99 | 355 | |
c2f493a4 | 356 | sprintf(path, "%s/info/alternates", relative_base); |
d5a63b99 JH |
357 | fd = open(path, O_RDONLY); |
358 | if (fd < 0) | |
359 | return; | |
360 | if (fstat(fd, &st) || (st.st_size == 0)) { | |
361 | close(fd); | |
9a217f2a | 362 | return; |
ace1534d | 363 | } |
c4712e45 | 364 | map = xmmap(NULL, st.st_size, PROT_READ, MAP_PRIVATE, fd, 0); |
d5a63b99 | 365 | close(fd); |
d5a63b99 | 366 | |
c2f493a4 MW |
367 | link_alt_odb_entries(map, map + st.st_size, '\n', relative_base, depth); |
368 | ||
d5a63b99 | 369 | munmap(map, st.st_size); |
ace1534d JH |
370 | } |
371 | ||
c2f493a4 MW |
372 | void prepare_alt_odb(void) |
373 | { | |
554fe20d | 374 | const char *alt; |
c2f493a4 MW |
375 | |
376 | alt = getenv(ALTERNATE_DB_ENVIRONMENT); | |
377 | if (!alt) alt = ""; | |
378 | ||
379 | if (alt_odb_tail) | |
380 | return; | |
381 | alt_odb_tail = &alt_odb_list; | |
382 | link_alt_odb_entries(alt, alt + strlen(alt), ':', NULL, 0); | |
383 | ||
384 | read_info_alternates(get_object_directory(), 0); | |
385 | } | |
386 | ||
ace1534d JH |
387 | static char *find_sha1_file(const unsigned char *sha1, struct stat *st) |
388 | { | |
ace1534d | 389 | char *name = sha1_file_name(sha1); |
d5a63b99 | 390 | struct alternate_object_database *alt; |
ace1534d JH |
391 | |
392 | if (!stat(name, st)) | |
393 | return name; | |
9a217f2a | 394 | prepare_alt_odb(); |
d5a63b99 JH |
395 | for (alt = alt_odb_list; alt; alt = alt->next) { |
396 | name = alt->name; | |
ace1534d | 397 | fill_sha1_path(name, sha1); |
d5a63b99 JH |
398 | if (!stat(alt->base, st)) |
399 | return alt->base; | |
ace1534d JH |
400 | } |
401 | return NULL; | |
402 | } | |
403 | ||
60bb8b14 | 404 | static unsigned int pack_used_ctr; |
a53128b6 SP |
405 | static unsigned int pack_mmap_calls; |
406 | static unsigned int peak_pack_open_windows; | |
407 | static unsigned int pack_open_windows; | |
408 | static size_t peak_pack_mapped; | |
60bb8b14 SP |
409 | static size_t pack_mapped; |
410 | static size_t page_size; | |
9a217f2a | 411 | struct packed_git *packed_git; |
1f688557 | 412 | |
a53128b6 SP |
413 | void pack_report() |
414 | { | |
415 | fprintf(stderr, | |
e05db0fd PR |
416 | "pack_report: getpagesize() = %10" SZ_FMT "\n" |
417 | "pack_report: core.packedGitWindowSize = %10" SZ_FMT "\n" | |
418 | "pack_report: core.packedGitLimit = %10" SZ_FMT "\n", | |
a53128b6 SP |
419 | page_size, |
420 | packed_git_window_size, | |
421 | packed_git_limit); | |
422 | fprintf(stderr, | |
423 | "pack_report: pack_used_ctr = %10u\n" | |
424 | "pack_report: pack_mmap_calls = %10u\n" | |
425 | "pack_report: pack_open_windows = %10u / %10u\n" | |
e05db0fd PR |
426 | "pack_report: pack_mapped = " |
427 | "%10" SZ_FMT " / %10" SZ_FMT "\n", | |
a53128b6 SP |
428 | pack_used_ctr, |
429 | pack_mmap_calls, | |
430 | pack_open_windows, peak_pack_open_windows, | |
431 | pack_mapped, peak_pack_mapped); | |
432 | } | |
433 | ||
1f688557 JH |
434 | static int check_packed_git_idx(const char *path, unsigned long *idx_size_, |
435 | void **idx_map_) | |
436 | { | |
437 | void *idx_map; | |
b18b00a6 | 438 | uint32_t *index; |
1f688557 JH |
439 | unsigned long idx_size; |
440 | int nr, i; | |
e93ec6f9 | 441 | int fd = open(path, O_RDONLY); |
1f688557 JH |
442 | struct stat st; |
443 | if (fd < 0) | |
444 | return -1; | |
445 | if (fstat(fd, &st)) { | |
446 | close(fd); | |
447 | return -1; | |
448 | } | |
449 | idx_size = st.st_size; | |
c4712e45 | 450 | idx_map = xmmap(NULL, idx_size, PROT_READ, MAP_PRIVATE, fd, 0); |
1f688557 | 451 | close(fd); |
1f688557 JH |
452 | |
453 | index = idx_map; | |
4d235c80 LT |
454 | *idx_map_ = idx_map; |
455 | *idx_size_ = idx_size; | |
1f688557 JH |
456 | |
457 | /* check index map */ | |
f9253394 | 458 | if (idx_size < 4*256 + 20 + 20) |
df1b059d SP |
459 | return error("index file %s is too small", path); |
460 | ||
461 | /* a future index format would start with this, as older git | |
462 | * binaries would fail the non-monotonic index check below. | |
463 | * give a nicer warning to the user if we can. | |
464 | */ | |
465 | if (index[0] == htonl(PACK_IDX_SIGNATURE)) | |
466 | return error("index file %s is a newer version" | |
467 | " and is not supported by this binary" | |
468 | " (try upgrading GIT to a newer version)", | |
469 | path); | |
470 | ||
1f688557 JH |
471 | nr = 0; |
472 | for (i = 0; i < 256; i++) { | |
473 | unsigned int n = ntohl(index[i]); | |
474 | if (n < nr) | |
df1b059d | 475 | return error("non-monotonic index %s", path); |
1f688557 JH |
476 | nr = n; |
477 | } | |
478 | ||
479 | /* | |
480 | * Total size: | |
481 | * - 256 index entries 4 bytes each | |
482 | * - 24-byte entries * nr (20-byte sha1 + 4-byte offset) | |
483 | * - 20-byte SHA1 of the packfile | |
484 | * - 20-byte SHA1 file checksum | |
485 | */ | |
486 | if (idx_size != 4*256 + nr * 24 + 20 + 20) | |
df1b059d | 487 | return error("wrong index file size in %s", path); |
1f688557 | 488 | |
1f688557 JH |
489 | return 0; |
490 | } | |
491 | ||
11daf39b SP |
492 | static void scan_windows(struct packed_git *p, |
493 | struct packed_git **lru_p, | |
494 | struct pack_window **lru_w, | |
495 | struct pack_window **lru_l) | |
1f688557 | 496 | { |
11daf39b SP |
497 | struct pack_window *w, *w_l; |
498 | ||
499 | for (w_l = NULL, w = p->windows; w; w = w->next) { | |
500 | if (!w->inuse_cnt) { | |
501 | if (!*lru_w || w->last_used < (*lru_w)->last_used) { | |
502 | *lru_p = p; | |
503 | *lru_w = w; | |
504 | *lru_l = w_l; | |
54044bf8 | 505 | } |
54044bf8 | 506 | } |
11daf39b | 507 | w_l = w; |
f9253394 | 508 | } |
11daf39b SP |
509 | } |
510 | ||
511 | static int unuse_one_window(struct packed_git *current) | |
512 | { | |
513 | struct packed_git *p, *lru_p = NULL; | |
514 | struct pack_window *lru_w = NULL, *lru_l = NULL; | |
515 | ||
516 | if (current) | |
517 | scan_windows(current, &lru_p, &lru_w, &lru_l); | |
518 | for (p = packed_git; p; p = p->next) | |
519 | scan_windows(p, &lru_p, &lru_w, &lru_l); | |
54044bf8 SP |
520 | if (lru_p) { |
521 | munmap(lru_w->base, lru_w->len); | |
522 | pack_mapped -= lru_w->len; | |
523 | if (lru_l) | |
524 | lru_l->next = lru_w->next; | |
525 | else { | |
526 | lru_p->windows = lru_w->next; | |
11daf39b | 527 | if (!lru_p->windows && lru_p != current) { |
54044bf8 SP |
528 | close(lru_p->pack_fd); |
529 | lru_p->pack_fd = -1; | |
530 | } | |
531 | } | |
532 | free(lru_w); | |
a53128b6 | 533 | pack_open_windows--; |
54044bf8 SP |
534 | return 1; |
535 | } | |
536 | return 0; | |
f9253394 JH |
537 | } |
538 | ||
97bfeb34 SP |
539 | void release_pack_memory(size_t need) |
540 | { | |
541 | size_t cur = pack_mapped; | |
542 | while (need >= (cur - pack_mapped) && unuse_one_window(NULL)) | |
543 | ; /* nothing */ | |
544 | } | |
545 | ||
03e79c88 | 546 | void unuse_pack(struct pack_window **w_cursor) |
f9253394 | 547 | { |
03e79c88 SP |
548 | struct pack_window *w = *w_cursor; |
549 | if (w) { | |
550 | w->inuse_cnt--; | |
551 | *w_cursor = NULL; | |
552 | } | |
1f688557 JH |
553 | } |
554 | ||
9bc879c1 | 555 | static void open_packed_git(struct packed_git *p) |
1f688557 | 556 | { |
9bc879c1 SP |
557 | struct stat st; |
558 | struct pack_header hdr; | |
559 | unsigned char sha1[20]; | |
560 | unsigned char *idx_sha1; | |
2c039da8 | 561 | long fd_flag; |
9bc879c1 SP |
562 | |
563 | p->pack_fd = open(p->pack_name, O_RDONLY); | |
564 | if (p->pack_fd < 0 || fstat(p->pack_fd, &st)) | |
565 | die("packfile %s cannot be opened", p->pack_name); | |
566 | ||
567 | /* If we created the struct before we had the pack we lack size. */ | |
bf592c50 | 568 | if (!p->pack_size) { |
bf592c50 DB |
569 | if (!S_ISREG(st.st_mode)) |
570 | die("packfile %s not a regular file", p->pack_name); | |
571 | p->pack_size = st.st_size; | |
9bc879c1 SP |
572 | } else if (p->pack_size != st.st_size) |
573 | die("packfile %s size changed", p->pack_name); | |
574 | ||
2c039da8 JH |
575 | /* We leave these file descriptors open with sliding mmap; |
576 | * there is no point keeping them open across exec(), though. | |
577 | */ | |
578 | fd_flag = fcntl(p->pack_fd, F_GETFD, 0); | |
579 | if (fd_flag < 0) | |
580 | die("cannot determine file descriptor flags"); | |
581 | fd_flag |= FD_CLOEXEC; | |
582 | if (fcntl(p->pack_fd, F_SETFD, fd_flag) == -1) | |
583 | die("cannot set FD_CLOEXEC"); | |
584 | ||
9bc879c1 | 585 | /* Verify we recognize this pack file format. */ |
e6e2bd62 SP |
586 | if (read_in_full(p->pack_fd, &hdr, sizeof(hdr)) != sizeof(hdr)) |
587 | die("file %s is far too short to be a packfile", p->pack_name); | |
9bc879c1 SP |
588 | if (hdr.hdr_signature != htonl(PACK_SIGNATURE)) |
589 | die("file %s is not a GIT packfile", p->pack_name); | |
590 | if (!pack_version_ok(hdr.hdr_version)) | |
591 | die("packfile %s is version %u and not supported" | |
592 | " (try upgrading GIT to a newer version)", | |
593 | p->pack_name, ntohl(hdr.hdr_version)); | |
594 | ||
595 | /* Verify the pack matches its index. */ | |
596 | if (num_packed_objects(p) != ntohl(hdr.hdr_entries)) | |
597 | die("packfile %s claims to have %u objects" | |
598 | " while index size indicates %u objects", | |
599 | p->pack_name, ntohl(hdr.hdr_entries), | |
600 | num_packed_objects(p)); | |
601 | if (lseek(p->pack_fd, p->pack_size - sizeof(sha1), SEEK_SET) == -1) | |
602 | die("end of packfile %s is unavailable", p->pack_name); | |
e6e2bd62 SP |
603 | if (read_in_full(p->pack_fd, sha1, sizeof(sha1)) != sizeof(sha1)) |
604 | die("packfile %s signature is unavailable", p->pack_name); | |
9bc879c1 SP |
605 | idx_sha1 = ((unsigned char *)p->index_base) + p->index_size - 40; |
606 | if (hashcmp(sha1, idx_sha1)) | |
607 | die("packfile %s does not match index", p->pack_name); | |
608 | } | |
609 | ||
60bb8b14 SP |
610 | static int in_window(struct pack_window *win, unsigned long offset) |
611 | { | |
612 | /* We must promise at least 20 bytes (one hash) after the | |
613 | * offset is available from this window, otherwise the offset | |
614 | * is not actually in this window and a different window (which | |
615 | * has that one hash excess) must be used. This is to support | |
616 | * the object header and delta base parsing routines below. | |
617 | */ | |
618 | off_t win_off = win->offset; | |
619 | return win_off <= offset | |
620 | && (offset + 20) <= (win_off + win->len); | |
621 | } | |
622 | ||
03e79c88 SP |
623 | unsigned char* use_pack(struct packed_git *p, |
624 | struct pack_window **w_cursor, | |
625 | unsigned long offset, | |
626 | unsigned int *left) | |
9bc879c1 | 627 | { |
60bb8b14 | 628 | struct pack_window *win = *w_cursor; |
03e79c88 | 629 | |
9bc879c1 SP |
630 | if (p->pack_fd == -1) |
631 | open_packed_git(p); | |
60bb8b14 SP |
632 | |
633 | /* Since packfiles end in a hash of their content and its | |
634 | * pointless to ask for an offset into the middle of that | |
635 | * hash, and the in_window function above wouldn't match | |
636 | * don't allow an offset too close to the end of the file. | |
637 | */ | |
638 | if (offset > (p->pack_size - 20)) | |
639 | die("offset beyond end of packfile (truncated pack?)"); | |
640 | ||
641 | if (!win || !in_window(win, offset)) { | |
642 | if (win) | |
643 | win->inuse_cnt--; | |
644 | for (win = p->windows; win; win = win->next) { | |
645 | if (in_window(win, offset)) | |
646 | break; | |
647 | } | |
648 | if (!win) { | |
649 | if (!page_size) | |
650 | page_size = getpagesize(); | |
651 | win = xcalloc(1, sizeof(*win)); | |
652 | win->offset = (offset / page_size) * page_size; | |
653 | win->len = p->pack_size - win->offset; | |
654 | if (win->len > packed_git_window_size) | |
655 | win->len = packed_git_window_size; | |
656 | pack_mapped += win->len; | |
11daf39b SP |
657 | while (packed_git_limit < pack_mapped |
658 | && unuse_one_window(p)) | |
60bb8b14 | 659 | ; /* nothing */ |
c4712e45 | 660 | win->base = xmmap(NULL, win->len, |
60bb8b14 SP |
661 | PROT_READ, MAP_PRIVATE, |
662 | p->pack_fd, win->offset); | |
663 | if (win->base == MAP_FAILED) | |
73b4e4be SP |
664 | die("packfile %s cannot be mapped: %s", |
665 | p->pack_name, | |
666 | strerror(errno)); | |
a53128b6 SP |
667 | pack_mmap_calls++; |
668 | pack_open_windows++; | |
669 | if (pack_mapped > peak_pack_mapped) | |
670 | peak_pack_mapped = pack_mapped; | |
671 | if (pack_open_windows > peak_pack_open_windows) | |
672 | peak_pack_open_windows = pack_open_windows; | |
60bb8b14 SP |
673 | win->next = p->windows; |
674 | p->windows = win; | |
675 | } | |
1f688557 | 676 | } |
03e79c88 SP |
677 | if (win != *w_cursor) { |
678 | win->last_used = pack_used_ctr++; | |
679 | win->inuse_cnt++; | |
680 | *w_cursor = win; | |
681 | } | |
60bb8b14 | 682 | offset -= win->offset; |
03e79c88 SP |
683 | if (left) |
684 | *left = win->len - offset; | |
685 | return win->base + offset; | |
1f688557 JH |
686 | } |
687 | ||
9d835df2 | 688 | struct packed_git *add_packed_git(char *path, int path_len, int local) |
1f688557 JH |
689 | { |
690 | struct stat st; | |
691 | struct packed_git *p; | |
692 | unsigned long idx_size; | |
693 | void *idx_map; | |
c0bbbb1b | 694 | unsigned char sha1[20]; |
1f688557 JH |
695 | |
696 | if (check_packed_git_idx(path, &idx_size, &idx_map)) | |
697 | return NULL; | |
698 | ||
699 | /* do we have a corresponding .pack file? */ | |
700 | strcpy(path + path_len - 4, ".pack"); | |
701 | if (stat(path, &st) || !S_ISREG(st.st_mode)) { | |
702 | munmap(idx_map, idx_size); | |
703 | return NULL; | |
704 | } | |
705 | /* ok, it looks sane as far as we can check without | |
706 | * actually mapping the pack file. | |
707 | */ | |
708 | p = xmalloc(sizeof(*p) + path_len + 2); | |
709 | strcpy(p->pack_name, path); | |
710 | p->index_size = idx_size; | |
711 | p->pack_size = st.st_size; | |
712 | p->index_base = idx_map; | |
713 | p->next = NULL; | |
c41ee586 | 714 | p->windows = NULL; |
9bc879c1 | 715 | p->pack_fd = -1; |
9d835df2 | 716 | p->pack_local = local; |
f4a11066 | 717 | if ((path_len > 44) && !get_sha1_hex(path + path_len - 44, sha1)) |
e702496e | 718 | hashcpy(p->sha1, sha1); |
1f688557 JH |
719 | return p; |
720 | } | |
721 | ||
bf592c50 | 722 | struct packed_git *parse_pack_index(unsigned char *sha1) |
c508df5e DB |
723 | { |
724 | char *path = sha1_pack_index_name(sha1); | |
725 | return parse_pack_index_file(sha1, path); | |
726 | } | |
727 | ||
2ab141a2 | 728 | struct packed_git *parse_pack_index_file(const unsigned char *sha1, char *idx_path) |
bf592c50 DB |
729 | { |
730 | struct packed_git *p; | |
731 | unsigned long idx_size; | |
732 | void *idx_map; | |
c508df5e | 733 | char *path; |
bf592c50 | 734 | |
c508df5e | 735 | if (check_packed_git_idx(idx_path, &idx_size, &idx_map)) |
bf592c50 DB |
736 | return NULL; |
737 | ||
738 | path = sha1_pack_name(sha1); | |
739 | ||
740 | p = xmalloc(sizeof(*p) + strlen(path) + 2); | |
741 | strcpy(p->pack_name, path); | |
742 | p->index_size = idx_size; | |
743 | p->pack_size = 0; | |
744 | p->index_base = idx_map; | |
745 | p->next = NULL; | |
c41ee586 | 746 | p->windows = NULL; |
9bc879c1 | 747 | p->pack_fd = -1; |
e702496e | 748 | hashcpy(p->sha1, sha1); |
bf592c50 DB |
749 | return p; |
750 | } | |
751 | ||
752 | void install_packed_git(struct packed_git *pack) | |
753 | { | |
754 | pack->next = packed_git; | |
755 | packed_git = pack; | |
756 | } | |
757 | ||
9d835df2 | 758 | static void prepare_packed_git_one(char *objdir, int local) |
1f688557 JH |
759 | { |
760 | char path[PATH_MAX]; | |
761 | int len; | |
762 | DIR *dir; | |
763 | struct dirent *de; | |
764 | ||
765 | sprintf(path, "%s/pack", objdir); | |
766 | len = strlen(path); | |
767 | dir = opendir(path); | |
b5b16990 | 768 | if (!dir) { |
26125f6b | 769 | if (errno != ENOENT) |
bd2afde8 | 770 | error("unable to open object pack directory: %s: %s", |
26125f6b | 771 | path, strerror(errno)); |
1f688557 | 772 | return; |
b5b16990 | 773 | } |
1f688557 JH |
774 | path[len++] = '/'; |
775 | while ((de = readdir(dir)) != NULL) { | |
776 | int namelen = strlen(de->d_name); | |
777 | struct packed_git *p; | |
778 | ||
5bb1cda5 | 779 | if (!has_extension(de->d_name, ".idx")) |
1f688557 JH |
780 | continue; |
781 | ||
54a15a8d | 782 | /* Don't reopen a pack we already have. */ |
1f688557 | 783 | strcpy(path + len, de->d_name); |
86f7780c JK |
784 | for (p = packed_git; p; p = p->next) { |
785 | if (!memcmp(path, p->pack_name, len + namelen - 4)) | |
786 | break; | |
787 | } | |
788 | if (p) | |
789 | continue; | |
54a15a8d SP |
790 | /* See if it really is a valid .idx file with corresponding |
791 | * .pack file that we can map. | |
792 | */ | |
9d835df2 | 793 | p = add_packed_git(path, len + namelen, local); |
1f688557 JH |
794 | if (!p) |
795 | continue; | |
625e9421 | 796 | install_packed_git(p); |
1f688557 | 797 | } |
5b35bcd5 | 798 | closedir(dir); |
1f688557 JH |
799 | } |
800 | ||
637cdd9d | 801 | static int prepare_packed_git_run_once = 0; |
9a217f2a | 802 | void prepare_packed_git(void) |
1f688557 | 803 | { |
d5a63b99 | 804 | struct alternate_object_database *alt; |
1f688557 | 805 | |
637cdd9d | 806 | if (prepare_packed_git_run_once) |
1f688557 | 807 | return; |
9d835df2 | 808 | prepare_packed_git_one(get_object_directory(), 1); |
9a217f2a | 809 | prepare_alt_odb(); |
d5a63b99 | 810 | for (alt = alt_odb_list; alt; alt = alt->next) { |
1494e038 | 811 | alt->name[-1] = 0; |
9d835df2 | 812 | prepare_packed_git_one(alt->base, 0); |
1494e038 | 813 | alt->name[-1] = '/'; |
1f688557 | 814 | } |
637cdd9d JK |
815 | prepare_packed_git_run_once = 1; |
816 | } | |
817 | ||
fc04c412 | 818 | void reprepare_packed_git(void) |
637cdd9d JK |
819 | { |
820 | prepare_packed_git_run_once = 0; | |
821 | prepare_packed_git(); | |
1f688557 JH |
822 | } |
823 | ||
5d6ccf5c | 824 | int check_sha1_signature(const unsigned char *sha1, void *map, unsigned long size, const char *type) |
0fcfd160 LT |
825 | { |
826 | unsigned char real_sha1[20]; | |
7cfb5f36 | 827 | hash_sha1_file(map, size, type, real_sha1); |
a89fccd2 | 828 | return hashcmp(sha1, real_sha1) ? -1 : 0; |
0fcfd160 LT |
829 | } |
830 | ||
bb6b8e4f | 831 | void *map_sha1_file(const unsigned char *sha1, unsigned long *size) |
0fcfd160 | 832 | { |
0fcfd160 LT |
833 | struct stat st; |
834 | void *map; | |
144bde78 | 835 | int fd; |
ace1534d JH |
836 | char *filename = find_sha1_file(sha1, &st); |
837 | ||
838 | if (!filename) { | |
ace1534d JH |
839 | return NULL; |
840 | } | |
0fcfd160 | 841 | |
144bde78 | 842 | fd = open(filename, O_RDONLY | sha1_file_open_flag); |
0fcfd160 | 843 | if (fd < 0) { |
144bde78 LT |
844 | /* See if it works without O_NOATIME */ |
845 | switch (sha1_file_open_flag) { | |
846 | default: | |
847 | fd = open(filename, O_RDONLY); | |
848 | if (fd >= 0) | |
849 | break; | |
850 | /* Fallthrough */ | |
851 | case 0: | |
144bde78 LT |
852 | return NULL; |
853 | } | |
854 | ||
1f688557 JH |
855 | /* If it failed once, it will probably fail again. |
856 | * Stop using O_NOATIME | |
857 | */ | |
144bde78 | 858 | sha1_file_open_flag = 0; |
0fcfd160 | 859 | } |
c4712e45 | 860 | map = xmmap(NULL, st.st_size, PROT_READ, MAP_PRIVATE, fd, 0); |
0fcfd160 | 861 | close(fd); |
0fcfd160 LT |
862 | *size = st.st_size; |
863 | return map; | |
864 | } | |
865 | ||
bb6b8e4f JH |
866 | int legacy_loose_object(unsigned char *map) |
867 | { | |
868 | unsigned int word; | |
869 | ||
870 | /* | |
871 | * Is it a zlib-compressed buffer? If so, the first byte | |
872 | * must be 0x78 (15-bit window size, deflated), and the | |
873 | * first 16-bit word is evenly divisible by 31 | |
874 | */ | |
875 | word = (map[0] << 8) + map[1]; | |
876 | if (map[0] == 0x78 && !(word % 31)) | |
877 | return 1; | |
878 | else | |
879 | return 0; | |
880 | } | |
881 | ||
72518e9c | 882 | unsigned long unpack_object_header_gently(const unsigned char *buf, unsigned long len, enum object_type *type, unsigned long *sizep) |
c4483576 | 883 | { |
ad1ed5ee | 884 | unsigned shift; |
93821bd9 | 885 | unsigned char c; |
93821bd9 | 886 | unsigned long size; |
ad1ed5ee JH |
887 | unsigned long used = 0; |
888 | ||
889 | c = buf[used++]; | |
890 | *type = (c >> 4) & 7; | |
891 | size = c & 15; | |
892 | shift = 4; | |
893 | while (c & 0x80) { | |
894 | if (len <= used) | |
895 | return 0; | |
896 | if (sizeof(long) * 8 <= shift) | |
897 | return 0; | |
898 | c = buf[used++]; | |
899 | size += (c & 0x7f) << shift; | |
900 | shift += 7; | |
901 | } | |
902 | *sizep = size; | |
903 | return used; | |
904 | } | |
905 | ||
906 | static int unpack_sha1_header(z_stream *stream, unsigned char *map, unsigned long mapsize, void *buffer, unsigned long bufsiz) | |
907 | { | |
908 | unsigned long size, used; | |
909 | static const char valid_loose_object_type[8] = { | |
910 | 0, /* OBJ_EXT */ | |
911 | 1, 1, 1, 1, /* "commit", "tree", "blob", "tag" */ | |
912 | 0, /* "delta" and others are invalid in a loose object */ | |
93821bd9 | 913 | }; |
ad1ed5ee | 914 | enum object_type type; |
93821bd9 | 915 | |
c4483576 LT |
916 | /* Get the data stream */ |
917 | memset(stream, 0, sizeof(*stream)); | |
918 | stream->next_in = map; | |
919 | stream->avail_in = mapsize; | |
920 | stream->next_out = buffer; | |
93821bd9 LT |
921 | stream->avail_out = bufsiz; |
922 | ||
bb6b8e4f | 923 | if (legacy_loose_object(map)) { |
93821bd9 LT |
924 | inflateInit(stream); |
925 | return inflate(stream, 0); | |
926 | } | |
927 | ||
ad1ed5ee JH |
928 | used = unpack_object_header_gently(map, mapsize, &type, &size); |
929 | if (!used || !valid_loose_object_type[type]) | |
93821bd9 | 930 | return -1; |
ad1ed5ee JH |
931 | map += used; |
932 | mapsize -= used; | |
93821bd9 LT |
933 | |
934 | /* Set up the stream for the rest.. */ | |
935 | stream->next_in = map; | |
936 | stream->avail_in = mapsize; | |
c4483576 | 937 | inflateInit(stream); |
93821bd9 LT |
938 | |
939 | /* And generate the fake traditional header */ | |
ad1ed5ee JH |
940 | stream->total_out = 1 + snprintf(buffer, bufsiz, "%s %lu", |
941 | type_names[type], size); | |
93821bd9 | 942 | return 0; |
c4483576 LT |
943 | } |
944 | ||
6da4016a | 945 | static void *unpack_sha1_rest(z_stream *stream, void *buffer, unsigned long size) |
5180cacc LT |
946 | { |
947 | int bytes = strlen(buffer) + 1; | |
d565b341 | 948 | unsigned char *buf = xmalloc(1+size); |
93821bd9 | 949 | unsigned long n; |
5180cacc | 950 | |
93821bd9 LT |
951 | n = stream->total_out - bytes; |
952 | if (n > size) | |
953 | n = size; | |
954 | memcpy(buf, (char *) buffer + bytes, n); | |
955 | bytes = n; | |
5180cacc LT |
956 | if (bytes < size) { |
957 | stream->next_out = buf + bytes; | |
958 | stream->avail_out = size - bytes; | |
959 | while (inflate(stream, Z_FINISH) == Z_OK) | |
960 | /* nothing */; | |
961 | } | |
962 | buf[size] = 0; | |
963 | inflateEnd(stream); | |
964 | return buf; | |
965 | } | |
966 | ||
967 | /* | |
968 | * We used to just use "sscanf()", but that's actually way | |
969 | * too permissive for what we want to check. So do an anal | |
970 | * object header parse by hand. | |
971 | */ | |
38d3874d | 972 | static int parse_sha1_header(char *hdr, char *type, unsigned long *sizep) |
5180cacc LT |
973 | { |
974 | int i; | |
975 | unsigned long size; | |
976 | ||
977 | /* | |
978 | * The type can be at most ten bytes (including the | |
979 | * terminating '\0' that we add), and is followed by | |
980 | * a space. | |
981 | */ | |
982 | i = 10; | |
983 | for (;;) { | |
984 | char c = *hdr++; | |
985 | if (c == ' ') | |
986 | break; | |
987 | if (!--i) | |
988 | return -1; | |
989 | *type++ = c; | |
990 | } | |
991 | *type = 0; | |
992 | ||
993 | /* | |
994 | * The length must follow immediately, and be in canonical | |
995 | * decimal format (ie "010" is not valid). | |
996 | */ | |
997 | size = *hdr++ - '0'; | |
998 | if (size > 9) | |
999 | return -1; | |
1000 | if (size) { | |
1001 | for (;;) { | |
1002 | unsigned long c = *hdr - '0'; | |
1003 | if (c > 9) | |
1004 | break; | |
1005 | hdr++; | |
1006 | size = size * 10 + c; | |
1007 | } | |
1008 | } | |
1009 | *sizep = size; | |
1010 | ||
1011 | /* | |
1012 | * The length must be followed by a zero byte | |
1013 | */ | |
1014 | return *hdr ? -1 : 0; | |
1015 | } | |
1016 | ||
0fcfd160 LT |
1017 | void * unpack_sha1_file(void *map, unsigned long mapsize, char *type, unsigned long *size) |
1018 | { | |
5180cacc | 1019 | int ret; |
0fcfd160 | 1020 | z_stream stream; |
5180cacc | 1021 | char hdr[8192]; |
0fcfd160 | 1022 | |
5180cacc LT |
1023 | ret = unpack_sha1_header(&stream, map, mapsize, hdr, sizeof(hdr)); |
1024 | if (ret < Z_OK || parse_sha1_header(hdr, type, size) < 0) | |
0fcfd160 LT |
1025 | return NULL; |
1026 | ||
5180cacc | 1027 | return unpack_sha1_rest(&stream, hdr, *size); |
0fcfd160 LT |
1028 | } |
1029 | ||
eb32d236 | 1030 | static unsigned long get_delta_base(struct packed_git *p, |
03e79c88 | 1031 | struct pack_window **w_curs, |
eb32d236 NP |
1032 | unsigned long offset, |
1033 | enum object_type kind, | |
1034 | unsigned long delta_obj_offset, | |
1035 | unsigned long *base_obj_offset) | |
1036 | { | |
03e79c88 | 1037 | unsigned char *base_info = use_pack(p, w_curs, offset, NULL); |
eb32d236 NP |
1038 | unsigned long base_offset; |
1039 | ||
8d8a4ea5 SP |
1040 | /* use_pack() assured us we have [base_info, base_info + 20) |
1041 | * as a range that we can look at without walking off the | |
1042 | * end of the mapped window. Its actually the hash size | |
1043 | * that is assured. An OFS_DELTA longer than the hash size | |
1044 | * is stupid, as then a REF_DELTA would be smaller to store. | |
1045 | */ | |
eb32d236 NP |
1046 | if (kind == OBJ_OFS_DELTA) { |
1047 | unsigned used = 0; | |
1048 | unsigned char c = base_info[used++]; | |
1049 | base_offset = c & 127; | |
1050 | while (c & 128) { | |
1051 | base_offset += 1; | |
1052 | if (!base_offset || base_offset & ~(~0UL >> 7)) | |
1053 | die("offset value overflow for delta base object"); | |
1054 | c = base_info[used++]; | |
1055 | base_offset = (base_offset << 7) + (c & 127); | |
1056 | } | |
1057 | base_offset = delta_obj_offset - base_offset; | |
1058 | if (base_offset >= delta_obj_offset) | |
1059 | die("delta base offset out of bound"); | |
1060 | offset += used; | |
1061 | } else if (kind == OBJ_REF_DELTA) { | |
1062 | /* The base entry _must_ be in the same pack */ | |
1063 | base_offset = find_pack_entry_one(base_info, p); | |
1064 | if (!base_offset) | |
1065 | die("failed to find delta-pack base object %s", | |
1066 | sha1_to_hex(base_info)); | |
1067 | offset += 20; | |
1068 | } else | |
1069 | die("I am totally screwed"); | |
1070 | *base_obj_offset = base_offset; | |
1071 | return offset; | |
1072 | } | |
1073 | ||
f3bf9224 | 1074 | /* forward declaration for a mutually recursive function */ |
43057304 | 1075 | static int packed_object_info(struct packed_git *p, unsigned long offset, |
f3bf9224 JH |
1076 | char *type, unsigned long *sizep); |
1077 | ||
43057304 | 1078 | static int packed_delta_info(struct packed_git *p, |
03e79c88 | 1079 | struct pack_window **w_curs, |
43057304 | 1080 | unsigned long offset, |
eb32d236 NP |
1081 | enum object_type kind, |
1082 | unsigned long obj_offset, | |
5db47c2b | 1083 | char *type, |
43057304 | 1084 | unsigned long *sizep) |
5db47c2b | 1085 | { |
43057304 | 1086 | unsigned long base_offset; |
f3bf9224 | 1087 | |
03e79c88 SP |
1088 | offset = get_delta_base(p, w_curs, offset, kind, |
1089 | obj_offset, &base_offset); | |
f3bf9224 | 1090 | |
c62266f3 JH |
1091 | /* We choose to only get the type of the base object and |
1092 | * ignore potentially corrupt pack file that expects the delta | |
1093 | * based on a base with a wrong size. This saves tons of | |
1094 | * inflate() calls. | |
1095 | */ | |
43057304 | 1096 | if (packed_object_info(p, base_offset, type, NULL)) |
c62266f3 | 1097 | die("cannot get info for delta-pack base"); |
5db47c2b | 1098 | |
c62266f3 JH |
1099 | if (sizep) { |
1100 | const unsigned char *data; | |
079afb18 | 1101 | unsigned char delta_head[20], *in; |
c62266f3 JH |
1102 | unsigned long result_size; |
1103 | z_stream stream; | |
1104 | int st; | |
1105 | ||
1106 | memset(&stream, 0, sizeof(stream)); | |
c62266f3 JH |
1107 | stream.next_out = delta_head; |
1108 | stream.avail_out = sizeof(delta_head); | |
1109 | ||
1110 | inflateInit(&stream); | |
079afb18 SP |
1111 | do { |
1112 | in = use_pack(p, w_curs, offset, &stream.avail_in); | |
1113 | stream.next_in = in; | |
1114 | st = inflate(&stream, Z_FINISH); | |
1115 | offset += stream.next_in - in; | |
1116 | } while ((st == Z_OK || st == Z_BUF_ERROR) | |
1117 | && stream.total_out < sizeof(delta_head)); | |
c62266f3 JH |
1118 | inflateEnd(&stream); |
1119 | if ((st != Z_STREAM_END) && | |
1120 | stream.total_out != sizeof(delta_head)) | |
1121 | die("delta data unpack-initial failed"); | |
1122 | ||
1123 | /* Examine the initial part of the delta to figure out | |
1124 | * the result size. | |
1125 | */ | |
1126 | data = delta_head; | |
8960844a NP |
1127 | |
1128 | /* ignore base size */ | |
1129 | get_delta_hdr_size(&data, delta_head+sizeof(delta_head)); | |
5db47c2b | 1130 | |
c62266f3 | 1131 | /* Read the result size */ |
8960844a | 1132 | result_size = get_delta_hdr_size(&data, delta_head+sizeof(delta_head)); |
c62266f3 JH |
1133 | *sizep = result_size; |
1134 | } | |
5db47c2b JH |
1135 | return 0; |
1136 | } | |
1137 | ||
03e79c88 SP |
1138 | static unsigned long unpack_object_header(struct packed_git *p, |
1139 | struct pack_window **w_curs, | |
1140 | unsigned long offset, | |
1141 | enum object_type *type, | |
1142 | unsigned long *sizep) | |
a733cb60 | 1143 | { |
03e79c88 SP |
1144 | unsigned char *base; |
1145 | unsigned int left; | |
ad1ed5ee | 1146 | unsigned long used; |
a733cb60 | 1147 | |
8d8a4ea5 SP |
1148 | /* use_pack() assures us we have [base, base + 20) available |
1149 | * as a range that we can look at at. (Its actually the hash | |
1150 | * size that is assurred.) With our object header encoding | |
1151 | * the maximum deflated object size is 2^137, which is just | |
1152 | * insane, so we know won't exceed what we have been given. | |
1153 | */ | |
03e79c88 SP |
1154 | base = use_pack(p, w_curs, offset, &left); |
1155 | used = unpack_object_header_gently(base, left, type, sizep); | |
ad1ed5ee JH |
1156 | if (!used) |
1157 | die("object offset outside of pack file"); | |
1158 | ||
1159 | return offset + used; | |
a733cb60 LT |
1160 | } |
1161 | ||
43057304 NP |
1162 | void packed_object_info_detail(struct packed_git *p, |
1163 | unsigned long offset, | |
ad8c80a5 JH |
1164 | char *type, |
1165 | unsigned long *size, | |
1166 | unsigned long *store_size, | |
f8f135c9 | 1167 | unsigned int *delta_chain_length, |
ad8c80a5 JH |
1168 | unsigned char *base_sha1) |
1169 | { | |
03e79c88 | 1170 | struct pack_window *w_curs = NULL; |
eb32d236 | 1171 | unsigned long obj_offset, val; |
43057304 | 1172 | unsigned char *next_sha1; |
ad8c80a5 JH |
1173 | enum object_type kind; |
1174 | ||
43057304 | 1175 | *delta_chain_length = 0; |
eb32d236 | 1176 | obj_offset = offset; |
03e79c88 | 1177 | offset = unpack_object_header(p, &w_curs, offset, &kind, size); |
43057304 NP |
1178 | |
1179 | for (;;) { | |
1180 | switch (kind) { | |
1181 | default: | |
08a19d87 | 1182 | die("pack %s contains unknown object type %d", |
43057304 NP |
1183 | p->pack_name, kind); |
1184 | case OBJ_COMMIT: | |
1185 | case OBJ_TREE: | |
1186 | case OBJ_BLOB: | |
1187 | case OBJ_TAG: | |
1188 | strcpy(type, type_names[kind]); | |
1189 | *store_size = 0; /* notyet */ | |
03e79c88 | 1190 | unuse_pack(&w_curs); |
43057304 | 1191 | return; |
eb32d236 | 1192 | case OBJ_OFS_DELTA: |
03e79c88 SP |
1193 | get_delta_base(p, &w_curs, offset, kind, |
1194 | obj_offset, &offset); | |
eb32d236 NP |
1195 | if (*delta_chain_length == 0) { |
1196 | /* TODO: find base_sha1 as pointed by offset */ | |
1197 | } | |
1198 | break; | |
1199 | case OBJ_REF_DELTA: | |
03e79c88 | 1200 | next_sha1 = use_pack(p, &w_curs, offset, NULL); |
43057304 NP |
1201 | if (*delta_chain_length == 0) |
1202 | hashcpy(base_sha1, next_sha1); | |
1203 | offset = find_pack_entry_one(next_sha1, p); | |
1204 | break; | |
1205 | } | |
eb32d236 | 1206 | obj_offset = offset; |
03e79c88 | 1207 | offset = unpack_object_header(p, &w_curs, offset, &kind, &val); |
43057304 | 1208 | (*delta_chain_length)++; |
ad8c80a5 | 1209 | } |
ad8c80a5 JH |
1210 | } |
1211 | ||
43057304 | 1212 | static int packed_object_info(struct packed_git *p, unsigned long offset, |
1f688557 JH |
1213 | char *type, unsigned long *sizep) |
1214 | { | |
03e79c88 | 1215 | struct pack_window *w_curs = NULL; |
eb32d236 | 1216 | unsigned long size, obj_offset = offset; |
a733cb60 | 1217 | enum object_type kind; |
03e79c88 | 1218 | int r; |
5db47c2b | 1219 | |
03e79c88 | 1220 | offset = unpack_object_header(p, &w_curs, offset, &kind, &size); |
5db47c2b | 1221 | |
a733cb60 | 1222 | switch (kind) { |
eb32d236 NP |
1223 | case OBJ_OFS_DELTA: |
1224 | case OBJ_REF_DELTA: | |
03e79c88 SP |
1225 | r = packed_delta_info(p, &w_curs, offset, kind, |
1226 | obj_offset, type, sizep); | |
1227 | unuse_pack(&w_curs); | |
1228 | return r; | |
a733cb60 | 1229 | case OBJ_COMMIT: |
a733cb60 | 1230 | case OBJ_TREE: |
a733cb60 | 1231 | case OBJ_BLOB: |
a733cb60 | 1232 | case OBJ_TAG: |
5a18f540 | 1233 | strcpy(type, type_names[kind]); |
03e79c88 | 1234 | unuse_pack(&w_curs); |
a69d0943 | 1235 | break; |
1f688557 | 1236 | default: |
08a19d87 | 1237 | die("pack %s contains unknown object type %d", |
264b16b6 | 1238 | p->pack_name, kind); |
1f688557 | 1239 | } |
c62266f3 JH |
1240 | if (sizep) |
1241 | *sizep = size; | |
1f688557 JH |
1242 | return 0; |
1243 | } | |
1244 | ||
eb950c19 | 1245 | static void *unpack_compressed_entry(struct packed_git *p, |
03e79c88 | 1246 | struct pack_window **w_curs, |
eb950c19 SP |
1247 | unsigned long offset, |
1248 | unsigned long size) | |
de530aaa SP |
1249 | { |
1250 | int st; | |
1251 | z_stream stream; | |
079afb18 | 1252 | unsigned char *buffer, *in; |
de530aaa SP |
1253 | |
1254 | buffer = xmalloc(size + 1); | |
1255 | buffer[size] = 0; | |
1256 | memset(&stream, 0, sizeof(stream)); | |
de530aaa SP |
1257 | stream.next_out = buffer; |
1258 | stream.avail_out = size; | |
1259 | ||
1260 | inflateInit(&stream); | |
079afb18 SP |
1261 | do { |
1262 | in = use_pack(p, w_curs, offset, &stream.avail_in); | |
1263 | stream.next_in = in; | |
1264 | st = inflate(&stream, Z_FINISH); | |
1265 | offset += stream.next_in - in; | |
1266 | } while (st == Z_OK || st == Z_BUF_ERROR); | |
de530aaa SP |
1267 | inflateEnd(&stream); |
1268 | if ((st != Z_STREAM_END) || stream.total_out != size) { | |
1269 | free(buffer); | |
1270 | return NULL; | |
1271 | } | |
1272 | ||
1273 | return buffer; | |
1274 | } | |
1275 | ||
eb950c19 | 1276 | static void *unpack_delta_entry(struct packed_git *p, |
03e79c88 | 1277 | struct pack_window **w_curs, |
eb950c19 | 1278 | unsigned long offset, |
1f688557 | 1279 | unsigned long delta_size, |
eb32d236 NP |
1280 | enum object_type kind, |
1281 | unsigned long obj_offset, | |
1f688557 | 1282 | char *type, |
eb950c19 | 1283 | unsigned long *sizep) |
1f688557 | 1284 | { |
7c3e8be3 | 1285 | void *delta_data, *result, *base; |
43057304 | 1286 | unsigned long result_size, base_size, base_offset; |
43057304 | 1287 | |
03e79c88 SP |
1288 | offset = get_delta_base(p, w_curs, offset, kind, |
1289 | obj_offset, &base_offset); | |
4d703a1a | 1290 | base = unpack_entry(p, base_offset, type, &base_size); |
67686d95 | 1291 | if (!base) |
43057304 NP |
1292 | die("failed to read delta base object at %lu from %s", |
1293 | base_offset, p->pack_name); | |
67686d95 | 1294 | |
03e79c88 | 1295 | delta_data = unpack_compressed_entry(p, w_curs, offset, delta_size); |
1f688557 JH |
1296 | result = patch_delta(base, base_size, |
1297 | delta_data, delta_size, | |
1298 | &result_size); | |
1299 | if (!result) | |
1300 | die("failed to apply delta"); | |
1301 | free(delta_data); | |
1302 | free(base); | |
1303 | *sizep = result_size; | |
1304 | return result; | |
1305 | } | |
1306 | ||
4d703a1a | 1307 | void *unpack_entry(struct packed_git *p, unsigned long offset, |
1f688557 JH |
1308 | char *type, unsigned long *sizep) |
1309 | { | |
03e79c88 | 1310 | struct pack_window *w_curs = NULL; |
4d703a1a SP |
1311 | unsigned long size, obj_offset = offset; |
1312 | enum object_type kind; | |
f9253394 | 1313 | void *retval; |
1f688557 | 1314 | |
03e79c88 | 1315 | offset = unpack_object_header(p, &w_curs, offset, &kind, &size); |
a733cb60 | 1316 | switch (kind) { |
eb32d236 NP |
1317 | case OBJ_OFS_DELTA: |
1318 | case OBJ_REF_DELTA: | |
03e79c88 SP |
1319 | retval = unpack_delta_entry(p, &w_curs, offset, size, |
1320 | kind, obj_offset, type, sizep); | |
4d703a1a | 1321 | break; |
a733cb60 | 1322 | case OBJ_COMMIT: |
a733cb60 | 1323 | case OBJ_TREE: |
a733cb60 | 1324 | case OBJ_BLOB: |
a733cb60 | 1325 | case OBJ_TAG: |
5a18f540 SP |
1326 | strcpy(type, type_names[kind]); |
1327 | *sizep = size; | |
03e79c88 | 1328 | retval = unpack_compressed_entry(p, &w_curs, offset, size); |
4d703a1a | 1329 | break; |
1f688557 | 1330 | default: |
4d703a1a | 1331 | die("unknown object type %i in %s", kind, p->pack_name); |
1f688557 | 1332 | } |
03e79c88 | 1333 | unuse_pack(&w_curs); |
4d703a1a | 1334 | return retval; |
1f688557 JH |
1335 | } |
1336 | ||
9a217f2a JH |
1337 | int num_packed_objects(const struct packed_git *p) |
1338 | { | |
f9253394 | 1339 | /* See check_packed_git_idx() */ |
9a217f2a JH |
1340 | return (p->index_size - 20 - 20 - 4*256) / 24; |
1341 | } | |
1342 | ||
1343 | int nth_packed_object_sha1(const struct packed_git *p, int n, | |
1344 | unsigned char* sha1) | |
1345 | { | |
1346 | void *index = p->index_base + 256; | |
1347 | if (n < 0 || num_packed_objects(p) <= n) | |
1348 | return -1; | |
e702496e | 1349 | hashcpy(sha1, (unsigned char *) index + (24 * n) + 4); |
9a217f2a JH |
1350 | return 0; |
1351 | } | |
1352 | ||
43057304 NP |
1353 | unsigned long find_pack_entry_one(const unsigned char *sha1, |
1354 | struct packed_git *p) | |
1f688557 | 1355 | { |
b18b00a6 | 1356 | uint32_t *level1_ofs = p->index_base; |
1f688557 JH |
1357 | int hi = ntohl(level1_ofs[*sha1]); |
1358 | int lo = ((*sha1 == 0x0) ? 0 : ntohl(level1_ofs[*sha1 - 1])); | |
1359 | void *index = p->index_base + 256; | |
1360 | ||
1361 | do { | |
1362 | int mi = (lo + hi) / 2; | |
a89fccd2 | 1363 | int cmp = hashcmp((unsigned char *)index + (24 * mi) + 4, sha1); |
43057304 | 1364 | if (!cmp) |
b18b00a6 | 1365 | return ntohl(*((uint32_t *)((char *)index + (24 * mi)))); |
1f688557 JH |
1366 | if (cmp > 0) |
1367 | hi = mi; | |
1368 | else | |
1369 | lo = mi+1; | |
1370 | } while (lo < hi); | |
1371 | return 0; | |
1372 | } | |
1373 | ||
d4ff6d92 SP |
1374 | static int matches_pack_name(struct packed_git *p, const char *ig) |
1375 | { | |
1376 | const char *last_c, *c; | |
1377 | ||
1378 | if (!strcmp(p->pack_name, ig)) | |
1379 | return 0; | |
1380 | ||
1381 | for (c = p->pack_name, last_c = c; *c;) | |
1382 | if (*c == '/') | |
1383 | last_c = ++c; | |
1384 | else | |
1385 | ++c; | |
1386 | if (!strcmp(last_c, ig)) | |
1387 | return 0; | |
1388 | ||
1389 | return 1; | |
1390 | } | |
1391 | ||
106d710b | 1392 | static int find_pack_entry(const unsigned char *sha1, struct pack_entry *e, const char **ignore_packed) |
1f688557 JH |
1393 | { |
1394 | struct packed_git *p; | |
43057304 NP |
1395 | unsigned long offset; |
1396 | ||
1f688557 JH |
1397 | prepare_packed_git(); |
1398 | ||
1399 | for (p = packed_git; p; p = p->next) { | |
106d710b JH |
1400 | if (ignore_packed) { |
1401 | const char **ig; | |
1402 | for (ig = ignore_packed; *ig; ig++) | |
d4ff6d92 | 1403 | if (!matches_pack_name(p, *ig)) |
106d710b JH |
1404 | break; |
1405 | if (*ig) | |
1406 | continue; | |
1407 | } | |
43057304 NP |
1408 | offset = find_pack_entry_one(sha1, p); |
1409 | if (offset) { | |
1410 | e->offset = offset; | |
1411 | e->p = p; | |
1412 | hashcpy(e->sha1, sha1); | |
1f688557 | 1413 | return 1; |
43057304 | 1414 | } |
1f688557 JH |
1415 | } |
1416 | return 0; | |
1417 | } | |
1418 | ||
bf592c50 DB |
1419 | struct packed_git *find_sha1_pack(const unsigned char *sha1, |
1420 | struct packed_git *packs) | |
1421 | { | |
1422 | struct packed_git *p; | |
bf592c50 DB |
1423 | |
1424 | for (p = packs; p; p = p->next) { | |
43057304 | 1425 | if (find_pack_entry_one(sha1, p)) |
bf592c50 DB |
1426 | return p; |
1427 | } | |
1428 | return NULL; | |
1429 | ||
1430 | } | |
1431 | ||
f0df4ed5 | 1432 | static int sha1_loose_object_info(const unsigned char *sha1, char *type, unsigned long *sizep) |
65c2e0c3 | 1433 | { |
36e4d74a | 1434 | int status; |
65c2e0c3 JH |
1435 | unsigned long mapsize, size; |
1436 | void *map; | |
1437 | z_stream stream; | |
36e4d74a | 1438 | char hdr[128]; |
65c2e0c3 | 1439 | |
bb6b8e4f | 1440 | map = map_sha1_file(sha1, &mapsize); |
f0df4ed5 JS |
1441 | if (!map) |
1442 | return error("unable to find %s", sha1_to_hex(sha1)); | |
36e4d74a JH |
1443 | if (unpack_sha1_header(&stream, map, mapsize, hdr, sizeof(hdr)) < 0) |
1444 | status = error("unable to unpack %s header", | |
1445 | sha1_to_hex(sha1)); | |
1446 | if (parse_sha1_header(hdr, type, &size) < 0) | |
1447 | status = error("unable to parse %s header", sha1_to_hex(sha1)); | |
c4584ae3 | 1448 | else { |
65c2e0c3 | 1449 | status = 0; |
c62266f3 JH |
1450 | if (sizep) |
1451 | *sizep = size; | |
65c2e0c3 | 1452 | } |
65c2e0c3 JH |
1453 | inflateEnd(&stream); |
1454 | munmap(map, mapsize); | |
1455 | return status; | |
1456 | } | |
1457 | ||
f0df4ed5 JS |
1458 | int sha1_object_info(const unsigned char *sha1, char *type, unsigned long *sizep) |
1459 | { | |
f0df4ed5 JS |
1460 | struct pack_entry e; |
1461 | ||
1462 | if (!find_pack_entry(sha1, &e, NULL)) { | |
1463 | reprepare_packed_git(); | |
1464 | if (!find_pack_entry(sha1, &e, NULL)) | |
1465 | return sha1_loose_object_info(sha1, type, sizep); | |
1466 | } | |
03e79c88 | 1467 | return packed_object_info(e.p, e.offset, type, sizep); |
f0df4ed5 JS |
1468 | } |
1469 | ||
1f688557 JH |
1470 | static void *read_packed_sha1(const unsigned char *sha1, char *type, unsigned long *size) |
1471 | { | |
1472 | struct pack_entry e; | |
1473 | ||
8276c007 | 1474 | if (!find_pack_entry(sha1, &e, NULL)) |
1f688557 | 1475 | return NULL; |
8276c007 PE |
1476 | else |
1477 | return unpack_entry(e.p, e.offset, type, size); | |
1f688557 JH |
1478 | } |
1479 | ||
0fcfd160 LT |
1480 | void * read_sha1_file(const unsigned char *sha1, char *type, unsigned long *size) |
1481 | { | |
1482 | unsigned long mapsize; | |
1483 | void *map, *buf; | |
1484 | ||
8276c007 PE |
1485 | buf = read_packed_sha1(sha1, type, size); |
1486 | if (buf) | |
1487 | return buf; | |
bb6b8e4f | 1488 | map = map_sha1_file(sha1, &mapsize); |
0fcfd160 LT |
1489 | if (map) { |
1490 | buf = unpack_sha1_file(map, mapsize, type, size); | |
1491 | munmap(map, mapsize); | |
1492 | return buf; | |
1493 | } | |
637cdd9d | 1494 | reprepare_packed_git(); |
8276c007 | 1495 | return read_packed_sha1(sha1, type, size); |
0fcfd160 LT |
1496 | } |
1497 | ||
40469ee9 | 1498 | void *read_object_with_reference(const unsigned char *sha1, |
bf0f910d | 1499 | const char *required_type, |
40469ee9 JH |
1500 | unsigned long *size, |
1501 | unsigned char *actual_sha1_return) | |
f4913f91 JH |
1502 | { |
1503 | char type[20]; | |
1504 | void *buffer; | |
1505 | unsigned long isize; | |
40469ee9 | 1506 | unsigned char actual_sha1[20]; |
f4913f91 | 1507 | |
e702496e | 1508 | hashcpy(actual_sha1, sha1); |
40469ee9 JH |
1509 | while (1) { |
1510 | int ref_length = -1; | |
1511 | const char *ref_type = NULL; | |
f4913f91 | 1512 | |
40469ee9 JH |
1513 | buffer = read_sha1_file(actual_sha1, type, &isize); |
1514 | if (!buffer) | |
1515 | return NULL; | |
1516 | if (!strcmp(type, required_type)) { | |
1517 | *size = isize; | |
1518 | if (actual_sha1_return) | |
e702496e | 1519 | hashcpy(actual_sha1_return, actual_sha1); |
40469ee9 JH |
1520 | return buffer; |
1521 | } | |
1522 | /* Handle references */ | |
8e440259 | 1523 | else if (!strcmp(type, commit_type)) |
40469ee9 | 1524 | ref_type = "tree "; |
8e440259 | 1525 | else if (!strcmp(type, tag_type)) |
40469ee9 JH |
1526 | ref_type = "object "; |
1527 | else { | |
1528 | free(buffer); | |
1529 | return NULL; | |
1530 | } | |
1531 | ref_length = strlen(ref_type); | |
f4913f91 | 1532 | |
40469ee9 | 1533 | if (memcmp(buffer, ref_type, ref_length) || |
1d7f171c | 1534 | get_sha1_hex((char *) buffer + ref_length, actual_sha1)) { |
40469ee9 JH |
1535 | free(buffer); |
1536 | return NULL; | |
1537 | } | |
1cf58e72 | 1538 | free(buffer); |
40469ee9 JH |
1539 | /* Now we have the ID of the referred-to object in |
1540 | * actual_sha1. Check again. */ | |
f4913f91 | 1541 | } |
f4913f91 JH |
1542 | } |
1543 | ||
972a9155 RS |
1544 | static void write_sha1_file_prepare(void *buf, unsigned long len, |
1545 | const char *type, unsigned char *sha1, | |
1546 | unsigned char *hdr, int *hdrlen) | |
d410c0f5 JH |
1547 | { |
1548 | SHA_CTX c; | |
1549 | ||
1550 | /* Generate the header */ | |
1551 | *hdrlen = sprintf((char *)hdr, "%s %lu", type, len)+1; | |
1552 | ||
1553 | /* Sha1.. */ | |
1554 | SHA1_Init(&c); | |
1555 | SHA1_Update(&c, hdr, *hdrlen); | |
1556 | SHA1_Update(&c, buf, len); | |
1557 | SHA1_Final(sha1, &c); | |
d410c0f5 JH |
1558 | } |
1559 | ||
230f1322 LT |
1560 | /* |
1561 | * Link the tempfile to the final place, possibly creating the | |
1562 | * last directory level as you do so. | |
1563 | * | |
1564 | * Returns the errno on failure, 0 on success. | |
1565 | */ | |
839837b9 | 1566 | static int link_temp_to_file(const char *tmpfile, const char *filename) |
230f1322 LT |
1567 | { |
1568 | int ret; | |
756aaf4a | 1569 | char *dir; |
230f1322 LT |
1570 | |
1571 | if (!link(tmpfile, filename)) | |
1572 | return 0; | |
1573 | ||
1574 | /* | |
756aaf4a | 1575 | * Try to mkdir the last path component if that failed. |
230f1322 LT |
1576 | * |
1577 | * Re-try the "link()" regardless of whether the mkdir | |
1578 | * succeeds, since a race might mean that somebody | |
1579 | * else succeeded. | |
1580 | */ | |
1581 | ret = errno; | |
756aaf4a SP |
1582 | dir = strrchr(filename, '/'); |
1583 | if (dir) { | |
1584 | *dir = 0; | |
866cae0d | 1585 | if (!mkdir(filename, 0777) && adjust_shared_perm(filename)) { |
91c23e48 | 1586 | *dir = '/'; |
756aaf4a | 1587 | return -2; |
91c23e48 | 1588 | } |
756aaf4a SP |
1589 | *dir = '/'; |
1590 | if (!link(tmpfile, filename)) | |
1591 | return 0; | |
1592 | ret = errno; | |
230f1322 LT |
1593 | } |
1594 | return ret; | |
1595 | } | |
1596 | ||
1597 | /* | |
1598 | * Move the just written object into its final resting place | |
1599 | */ | |
839837b9 | 1600 | int move_temp_to_file(const char *tmpfile, const char *filename) |
230f1322 LT |
1601 | { |
1602 | int ret = link_temp_to_file(tmpfile, filename); | |
7ebb6fca LT |
1603 | |
1604 | /* | |
1605 | * Coda hack - coda doesn't like cross-directory links, | |
1606 | * so we fall back to a rename, which will mean that it | |
1607 | * won't be able to check collisions, but that's not a | |
1608 | * big deal. | |
1609 | * | |
1610 | * The same holds for FAT formatted media. | |
1611 | * | |
1612 | * When this succeeds, we just return 0. We have nothing | |
1613 | * left to unlink. | |
1614 | */ | |
1615 | if (ret && ret != EEXIST) { | |
1616 | if (!rename(tmpfile, filename)) | |
230f1322 | 1617 | return 0; |
9e48b389 | 1618 | ret = errno; |
230f1322 LT |
1619 | } |
1620 | unlink(tmpfile); | |
1621 | if (ret) { | |
1622 | if (ret != EEXIST) { | |
916d081b | 1623 | return error("unable to write sha1 filename %s: %s\n", filename, strerror(ret)); |
230f1322 LT |
1624 | } |
1625 | /* FIXME!!! Collision check here ? */ | |
1626 | } | |
1627 | ||
1628 | return 0; | |
1629 | } | |
1630 | ||
4d548150 LT |
1631 | static int write_buffer(int fd, const void *buf, size_t len) |
1632 | { | |
d34cf19b | 1633 | if (write_in_full(fd, buf, len) < 0) |
93822c22 | 1634 | return error("file write error (%s)", strerror(errno)); |
4d548150 LT |
1635 | return 0; |
1636 | } | |
1637 | ||
93821bd9 LT |
1638 | static int write_binary_header(unsigned char *hdr, enum object_type type, unsigned long len) |
1639 | { | |
1640 | int hdr_len; | |
1641 | unsigned char c; | |
1642 | ||
1643 | c = (type << 4) | (len & 15); | |
1644 | len >>= 4; | |
1645 | hdr_len = 1; | |
1646 | while (len) { | |
1647 | *hdr++ = c | 0x80; | |
1648 | hdr_len++; | |
1649 | c = (len & 0x7f); | |
1650 | len >>= 7; | |
1651 | } | |
1652 | *hdr = c; | |
1653 | return hdr_len; | |
1654 | } | |
1655 | ||
1656 | static void setup_object_header(z_stream *stream, const char *type, unsigned long len) | |
1657 | { | |
1658 | int obj_type, hdr; | |
1659 | ||
1660 | if (use_legacy_headers) { | |
1661 | while (deflate(stream, 0) == Z_OK) | |
1662 | /* nothing */; | |
1663 | return; | |
1664 | } | |
1665 | if (!strcmp(type, blob_type)) | |
1666 | obj_type = OBJ_BLOB; | |
1667 | else if (!strcmp(type, tree_type)) | |
1668 | obj_type = OBJ_TREE; | |
1669 | else if (!strcmp(type, commit_type)) | |
1670 | obj_type = OBJ_COMMIT; | |
1671 | else if (!strcmp(type, tag_type)) | |
1672 | obj_type = OBJ_TAG; | |
1673 | else | |
1674 | die("trying to generate bogus object of type '%s'", type); | |
1675 | hdr = write_binary_header(stream->next_out, obj_type, len); | |
1676 | stream->total_out = hdr; | |
1677 | stream->next_out += hdr; | |
1678 | stream->avail_out -= hdr; | |
1679 | } | |
1680 | ||
abdc3fc8 RS |
1681 | int hash_sha1_file(void *buf, unsigned long len, const char *type, |
1682 | unsigned char *sha1) | |
1683 | { | |
1684 | unsigned char hdr[50]; | |
1685 | int hdrlen; | |
1686 | write_sha1_file_prepare(buf, len, type, sha1, hdr, &hdrlen); | |
1687 | return 0; | |
1688 | } | |
1689 | ||
bf0f910d | 1690 | int write_sha1_file(void *buf, unsigned long len, const char *type, unsigned char *returnsha1) |
0fcfd160 LT |
1691 | { |
1692 | int size; | |
bf0f910d | 1693 | unsigned char *compressed; |
0fcfd160 LT |
1694 | z_stream stream; |
1695 | unsigned char sha1[20]; | |
706bc531 | 1696 | char *filename; |
aac17941 | 1697 | static char tmpfile[PATH_MAX]; |
bf0f910d | 1698 | unsigned char hdr[50]; |
230f1322 | 1699 | int fd, hdrlen; |
a44c9a5e | 1700 | |
d410c0f5 JH |
1701 | /* Normally if we have it in the pack then we do not bother writing |
1702 | * it out into .git/objects/??/?{38} file. | |
1703 | */ | |
972a9155 RS |
1704 | write_sha1_file_prepare(buf, len, type, sha1, hdr, &hdrlen); |
1705 | filename = sha1_file_name(sha1); | |
706bc531 | 1706 | if (returnsha1) |
e702496e | 1707 | hashcpy(returnsha1, sha1); |
d410c0f5 JH |
1708 | if (has_sha1_file(sha1)) |
1709 | return 0; | |
aac17941 LT |
1710 | fd = open(filename, O_RDONLY); |
1711 | if (fd >= 0) { | |
706bc531 | 1712 | /* |
aac17941 LT |
1713 | * FIXME!!! We might do collision checking here, but we'd |
1714 | * need to uncompress the old file and check it. Later. | |
706bc531 | 1715 | */ |
aac17941 | 1716 | close(fd); |
706bc531 LT |
1717 | return 0; |
1718 | } | |
1719 | ||
aac17941 | 1720 | if (errno != ENOENT) { |
916d081b | 1721 | return error("sha1 file %s: %s\n", filename, strerror(errno)); |
aac17941 LT |
1722 | } |
1723 | ||
1724 | snprintf(tmpfile, sizeof(tmpfile), "%s/obj_XXXXXX", get_object_directory()); | |
ace1534d | 1725 | |
aac17941 LT |
1726 | fd = mkstemp(tmpfile); |
1727 | if (fd < 0) { | |
916d081b PB |
1728 | if (errno == EPERM) |
1729 | return error("insufficient permission for adding an object to repository database %s\n", get_object_directory()); | |
1730 | else | |
1731 | return error("unable to create temporary sha1 filename %s: %s\n", tmpfile, strerror(errno)); | |
aac17941 LT |
1732 | } |
1733 | ||
0fcfd160 LT |
1734 | /* Set it up */ |
1735 | memset(&stream, 0, sizeof(stream)); | |
12f6c308 | 1736 | deflateInit(&stream, zlib_compression_level); |
93821bd9 | 1737 | size = 8 + deflateBound(&stream, len+hdrlen); |
812666c8 | 1738 | compressed = xmalloc(size); |
0fcfd160 LT |
1739 | |
1740 | /* Compress it */ | |
0fcfd160 LT |
1741 | stream.next_out = compressed; |
1742 | stream.avail_out = size; | |
a44c9a5e LT |
1743 | |
1744 | /* First header.. */ | |
1745 | stream.next_in = hdr; | |
1746 | stream.avail_in = hdrlen; | |
93821bd9 | 1747 | setup_object_header(&stream, type, len); |
a44c9a5e LT |
1748 | |
1749 | /* Then the data itself.. */ | |
1750 | stream.next_in = buf; | |
1751 | stream.avail_in = len; | |
0fcfd160 LT |
1752 | while (deflate(&stream, Z_FINISH) == Z_OK) |
1753 | /* nothing */; | |
1754 | deflateEnd(&stream); | |
1755 | size = stream.total_out; | |
1756 | ||
4d548150 LT |
1757 | if (write_buffer(fd, compressed, size) < 0) |
1758 | die("unable to write sha1 file"); | |
aac17941 | 1759 | fchmod(fd, 0444); |
706bc531 | 1760 | close(fd); |
383f85b7 | 1761 | free(compressed); |
0fcfd160 | 1762 | |
230f1322 | 1763 | return move_temp_to_file(tmpfile, filename); |
0fcfd160 | 1764 | } |
8237b185 | 1765 | |
4d548150 LT |
1766 | /* |
1767 | * We need to unpack and recompress the object for writing | |
1768 | * it out to a different file. | |
1769 | */ | |
1770 | static void *repack_object(const unsigned char *sha1, unsigned long *objsize) | |
a5eda52b | 1771 | { |
4d548150 | 1772 | size_t size; |
a5eda52b | 1773 | z_stream stream; |
4d548150 LT |
1774 | unsigned char *unpacked; |
1775 | unsigned long len; | |
1776 | char type[20]; | |
1777 | char hdr[50]; | |
1778 | int hdrlen; | |
1779 | void *buf; | |
bfc66daf | 1780 | |
a9486b02 | 1781 | /* need to unpack and recompress it by itself */ |
4d548150 | 1782 | unpacked = read_packed_sha1(sha1, type, &len); |
8276c007 PE |
1783 | if (!unpacked) |
1784 | error("cannot read sha1_file for %s", sha1_to_hex(sha1)); | |
a5eda52b | 1785 | |
4d548150 | 1786 | hdrlen = sprintf(hdr, "%s %lu", type, len) + 1; |
a5eda52b | 1787 | |
4d548150 LT |
1788 | /* Set it up */ |
1789 | memset(&stream, 0, sizeof(stream)); | |
12f6c308 | 1790 | deflateInit(&stream, zlib_compression_level); |
4d548150 LT |
1791 | size = deflateBound(&stream, len + hdrlen); |
1792 | buf = xmalloc(size); | |
a5eda52b | 1793 | |
4d548150 LT |
1794 | /* Compress it */ |
1795 | stream.next_out = buf; | |
1796 | stream.avail_out = size; | |
a5eda52b | 1797 | |
4d548150 LT |
1798 | /* First header.. */ |
1799 | stream.next_in = (void *)hdr; | |
1800 | stream.avail_in = hdrlen; | |
1801 | while (deflate(&stream, 0) == Z_OK) | |
1802 | /* nothing */; | |
bfc66daf | 1803 | |
4d548150 LT |
1804 | /* Then the data itself.. */ |
1805 | stream.next_in = unpacked; | |
1806 | stream.avail_in = len; | |
1807 | while (deflate(&stream, Z_FINISH) == Z_OK) | |
1808 | /* nothing */; | |
1809 | deflateEnd(&stream); | |
1810 | free(unpacked); | |
bfc66daf | 1811 | |
4d548150 LT |
1812 | *objsize = stream.total_out; |
1813 | return buf; | |
1814 | } | |
1815 | ||
1816 | int write_sha1_to_fd(int fd, const unsigned char *sha1) | |
1817 | { | |
1818 | int retval; | |
1819 | unsigned long objsize; | |
bb6b8e4f | 1820 | void *buf = map_sha1_file(sha1, &objsize); |
4d548150 LT |
1821 | |
1822 | if (buf) { | |
1823 | retval = write_buffer(fd, buf, objsize); | |
1824 | munmap(buf, objsize); | |
1825 | return retval; | |
1826 | } | |
1827 | ||
1828 | buf = repack_object(sha1, &objsize); | |
1829 | retval = write_buffer(fd, buf, objsize); | |
1830 | free(buf); | |
1831 | return retval; | |
a5eda52b DB |
1832 | } |
1833 | ||
70b9829e DB |
1834 | int write_sha1_from_fd(const unsigned char *sha1, int fd, char *buffer, |
1835 | size_t bufsize, size_t *bufposn) | |
8237b185 | 1836 | { |
230f1322 | 1837 | char tmpfile[PATH_MAX]; |
8237b185 DB |
1838 | int local; |
1839 | z_stream stream; | |
1840 | unsigned char real_sha1[20]; | |
bf0f910d | 1841 | unsigned char discard[4096]; |
8237b185 DB |
1842 | int ret; |
1843 | SHA_CTX c; | |
1844 | ||
230f1322 | 1845 | snprintf(tmpfile, sizeof(tmpfile), "%s/obj_XXXXXX", get_object_directory()); |
8237b185 | 1846 | |
230f1322 | 1847 | local = mkstemp(tmpfile); |
916d081b PB |
1848 | if (local < 0) { |
1849 | if (errno == EPERM) | |
1850 | return error("insufficient permission for adding an object to repository database %s\n", get_object_directory()); | |
1851 | else | |
1852 | return error("unable to create temporary sha1 filename %s: %s\n", tmpfile, strerror(errno)); | |
1853 | } | |
8237b185 DB |
1854 | |
1855 | memset(&stream, 0, sizeof(stream)); | |
1856 | ||
1857 | inflateInit(&stream); | |
1858 | ||
1859 | SHA1_Init(&c); | |
1860 | ||
1861 | do { | |
1862 | ssize_t size; | |
70b9829e DB |
1863 | if (*bufposn) { |
1864 | stream.avail_in = *bufposn; | |
96ad15ae | 1865 | stream.next_in = (unsigned char *) buffer; |
70b9829e DB |
1866 | do { |
1867 | stream.next_out = discard; | |
1868 | stream.avail_out = sizeof(discard); | |
1869 | ret = inflate(&stream, Z_SYNC_FLUSH); | |
1870 | SHA1_Update(&c, discard, sizeof(discard) - | |
1871 | stream.avail_out); | |
1872 | } while (stream.avail_in && ret == Z_OK); | |
4d548150 LT |
1873 | if (write_buffer(local, buffer, *bufposn - stream.avail_in) < 0) |
1874 | die("unable to write sha1 file"); | |
70b9829e DB |
1875 | memmove(buffer, buffer + *bufposn - stream.avail_in, |
1876 | stream.avail_in); | |
1877 | *bufposn = stream.avail_in; | |
1878 | if (ret != Z_OK) | |
1879 | break; | |
1880 | } | |
93d26e4c | 1881 | size = xread(fd, buffer + *bufposn, bufsize - *bufposn); |
8237b185 DB |
1882 | if (size <= 0) { |
1883 | close(local); | |
230f1322 | 1884 | unlink(tmpfile); |
8237b185 DB |
1885 | if (!size) |
1886 | return error("Connection closed?"); | |
1887 | perror("Reading from connection"); | |
1888 | return -1; | |
1889 | } | |
70b9829e DB |
1890 | *bufposn += size; |
1891 | } while (1); | |
8237b185 DB |
1892 | inflateEnd(&stream); |
1893 | ||
1894 | close(local); | |
1895 | SHA1_Final(real_sha1, &c); | |
1896 | if (ret != Z_STREAM_END) { | |
230f1322 | 1897 | unlink(tmpfile); |
8237b185 DB |
1898 | return error("File %s corrupted", sha1_to_hex(sha1)); |
1899 | } | |
a89fccd2 | 1900 | if (hashcmp(sha1, real_sha1)) { |
230f1322 | 1901 | unlink(tmpfile); |
bd2afde8 | 1902 | return error("File %s has bad hash", sha1_to_hex(sha1)); |
8237b185 | 1903 | } |
230f1322 LT |
1904 | |
1905 | return move_temp_to_file(tmpfile, sha1_file_name(sha1)); | |
8237b185 DB |
1906 | } |
1907 | ||
bf592c50 DB |
1908 | int has_pack_index(const unsigned char *sha1) |
1909 | { | |
1910 | struct stat st; | |
1911 | if (stat(sha1_pack_index_name(sha1), &st)) | |
1912 | return 0; | |
1913 | return 1; | |
1914 | } | |
1915 | ||
1916 | int has_pack_file(const unsigned char *sha1) | |
1917 | { | |
1918 | struct stat st; | |
1919 | if (stat(sha1_pack_name(sha1), &st)) | |
1920 | return 0; | |
1921 | return 1; | |
1922 | } | |
1923 | ||
106d710b | 1924 | int has_sha1_pack(const unsigned char *sha1, const char **ignore_packed) |
dade09c2 LT |
1925 | { |
1926 | struct pack_entry e; | |
106d710b | 1927 | return find_pack_entry(sha1, &e, ignore_packed); |
dade09c2 LT |
1928 | } |
1929 | ||
8237b185 DB |
1930 | int has_sha1_file(const unsigned char *sha1) |
1931 | { | |
8237b185 | 1932 | struct stat st; |
1f688557 JH |
1933 | struct pack_entry e; |
1934 | ||
106d710b | 1935 | if (find_pack_entry(sha1, &e, NULL)) |
1f688557 | 1936 | return 1; |
ab90ea5d | 1937 | return find_sha1_file(sha1, &st) ? 1 : 0; |
8237b185 | 1938 | } |
74400e71 | 1939 | |
e7332f96 BE |
1940 | /* |
1941 | * reads from fd as long as possible into a supplied buffer of size bytes. | |
82e5a82f | 1942 | * If necessary the buffer's size is increased using realloc() |
e7332f96 BE |
1943 | * |
1944 | * returns 0 if anything went fine and -1 otherwise | |
1945 | * | |
1946 | * NOTE: both buf and size may change, but even when -1 is returned | |
1947 | * you still have to free() it yourself. | |
1948 | */ | |
1949 | int read_pipe(int fd, char** return_buf, unsigned long* return_size) | |
024510c8 | 1950 | { |
e7332f96 BE |
1951 | char* buf = *return_buf; |
1952 | unsigned long size = *return_size; | |
1953 | int iret; | |
024510c8 | 1954 | unsigned long off = 0; |
e7332f96 | 1955 | |
024510c8 | 1956 | do { |
e7332f96 | 1957 | iret = xread(fd, buf + off, size - off); |
024510c8 DB |
1958 | if (iret > 0) { |
1959 | off += iret; | |
1960 | if (off == size) { | |
1961 | size *= 2; | |
83572c1a | 1962 | buf = xrealloc(buf, size); |
024510c8 DB |
1963 | } |
1964 | } | |
1965 | } while (iret > 0); | |
e7332f96 BE |
1966 | |
1967 | *return_buf = buf; | |
1968 | *return_size = off; | |
1969 | ||
1970 | if (iret < 0) | |
1971 | return -1; | |
1972 | return 0; | |
1973 | } | |
1974 | ||
1975 | int index_pipe(unsigned char *sha1, int fd, const char *type, int write_object) | |
1976 | { | |
1977 | unsigned long size = 4096; | |
2d7320d0 | 1978 | char *buf = xmalloc(size); |
e7332f96 | 1979 | int ret; |
e7332f96 BE |
1980 | |
1981 | if (read_pipe(fd, &buf, &size)) { | |
024510c8 DB |
1982 | free(buf); |
1983 | return -1; | |
1984 | } | |
e7332f96 | 1985 | |
024510c8 | 1986 | if (!type) |
8e440259 | 1987 | type = blob_type; |
024510c8 | 1988 | if (write_object) |
e7332f96 | 1989 | ret = write_sha1_file(buf, size, type, sha1); |
abdc3fc8 RS |
1990 | else |
1991 | ret = hash_sha1_file(buf, size, type, sha1); | |
024510c8 DB |
1992 | free(buf); |
1993 | return ret; | |
1994 | } | |
1995 | ||
7672db20 | 1996 | int index_fd(unsigned char *sha1, int fd, struct stat *st, int write_object, const char *type) |
74400e71 | 1997 | { |
74400e71 | 1998 | unsigned long size = st->st_size; |
aac17941 LT |
1999 | void *buf; |
2000 | int ret; | |
74400e71 | 2001 | |
aac17941 | 2002 | buf = ""; |
74400e71 | 2003 | if (size) |
c4712e45 | 2004 | buf = xmmap(NULL, size, PROT_READ, MAP_PRIVATE, fd, 0); |
74400e71 | 2005 | close(fd); |
74400e71 | 2006 | |
7672db20 | 2007 | if (!type) |
8e440259 | 2008 | type = blob_type; |
7672db20 BL |
2009 | if (write_object) |
2010 | ret = write_sha1_file(buf, size, type, sha1); | |
abdc3fc8 RS |
2011 | else |
2012 | ret = hash_sha1_file(buf, size, type, sha1); | |
aac17941 LT |
2013 | if (size) |
2014 | munmap(buf, size); | |
2015 | return ret; | |
74400e71 | 2016 | } |
ec1fcc16 JH |
2017 | |
2018 | int index_path(unsigned char *sha1, const char *path, struct stat *st, int write_object) | |
2019 | { | |
2020 | int fd; | |
2021 | char *target; | |
2022 | ||
2023 | switch (st->st_mode & S_IFMT) { | |
2024 | case S_IFREG: | |
2025 | fd = open(path, O_RDONLY); | |
2026 | if (fd < 0) | |
2027 | return error("open(\"%s\"): %s", path, | |
2028 | strerror(errno)); | |
2029 | if (index_fd(sha1, fd, st, write_object, NULL) < 0) | |
2030 | return error("%s: failed to insert into database", | |
2031 | path); | |
2032 | break; | |
2033 | case S_IFLNK: | |
2034 | target = xmalloc(st->st_size+1); | |
2035 | if (readlink(path, target, st->st_size+1) != st->st_size) { | |
2036 | char *errstr = strerror(errno); | |
2037 | free(target); | |
2038 | return error("readlink(\"%s\"): %s", path, | |
2039 | errstr); | |
2040 | } | |
abdc3fc8 RS |
2041 | if (!write_object) |
2042 | hash_sha1_file(target, st->st_size, blob_type, sha1); | |
2043 | else if (write_sha1_file(target, st->st_size, blob_type, sha1)) | |
ec1fcc16 JH |
2044 | return error("%s: failed to insert into database", |
2045 | path); | |
2046 | free(target); | |
2047 | break; | |
2048 | default: | |
2049 | return error("%s: unsupported file type", path); | |
2050 | } | |
2051 | return 0; | |
2052 | } | |
a69e5429 JH |
2053 | |
2054 | int read_pack_header(int fd, struct pack_header *header) | |
2055 | { | |
2056 | char *c = (char*)header; | |
2057 | ssize_t remaining = sizeof(struct pack_header); | |
2058 | do { | |
2059 | ssize_t r = xread(fd, c, remaining); | |
2060 | if (r <= 0) | |
2061 | /* "eof before pack header was fully read" */ | |
2062 | return PH_ERROR_EOF; | |
2063 | remaining -= r; | |
2064 | c += r; | |
2065 | } while (remaining > 0); | |
2066 | if (header->hdr_signature != htonl(PACK_SIGNATURE)) | |
2067 | /* "protocol error (pack signature mismatch detected)" */ | |
2068 | return PH_ERROR_PACK_SIGNATURE; | |
2069 | if (!pack_version_ok(header->hdr_version)) | |
2070 | /* "protocol error (pack version unsupported)" */ | |
2071 | return PH_ERROR_PROTOCOL; | |
2072 | return 0; | |
2073 | } |