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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" | |
f35a6d3b | 16 | #include "refs.h" |
70f5d5d3 | 17 | #include "pack-revindex.h" |
628522ec | 18 | #include "sha1-lookup.h" |
0fcfd160 | 19 | |
144bde78 LT |
20 | #ifndef O_NOATIME |
21 | #if defined(__linux__) && (defined(__i386__) || defined(__PPC__)) | |
22 | #define O_NOATIME 01000000 | |
23 | #else | |
24 | #define O_NOATIME 0 | |
25 | #endif | |
26 | #endif | |
27 | ||
e05db0fd PR |
28 | #ifdef NO_C99_FORMAT |
29 | #define SZ_FMT "lu" | |
9e42d6a1 | 30 | static unsigned long sz_fmt(size_t s) { return (unsigned long)s; } |
e05db0fd PR |
31 | #else |
32 | #define SZ_FMT "zu" | |
9e42d6a1 | 33 | static size_t sz_fmt(size_t s) { return s; } |
e05db0fd PR |
34 | #endif |
35 | ||
96f1e58f | 36 | const unsigned char null_sha1[20]; |
88cd621d | 37 | |
144bde78 LT |
38 | static unsigned int sha1_file_open_flag = O_NOATIME; |
39 | ||
192a6be2 | 40 | const signed char hexval_table[256] = { |
e49521b5 JH |
41 | -1, -1, -1, -1, -1, -1, -1, -1, /* 00-07 */ |
42 | -1, -1, -1, -1, -1, -1, -1, -1, /* 08-0f */ | |
43 | -1, -1, -1, -1, -1, -1, -1, -1, /* 10-17 */ | |
44 | -1, -1, -1, -1, -1, -1, -1, -1, /* 18-1f */ | |
45 | -1, -1, -1, -1, -1, -1, -1, -1, /* 20-27 */ | |
46 | -1, -1, -1, -1, -1, -1, -1, -1, /* 28-2f */ | |
47 | 0, 1, 2, 3, 4, 5, 6, 7, /* 30-37 */ | |
48 | 8, 9, -1, -1, -1, -1, -1, -1, /* 38-3f */ | |
49 | -1, 10, 11, 12, 13, 14, 15, -1, /* 40-47 */ | |
50 | -1, -1, -1, -1, -1, -1, -1, -1, /* 48-4f */ | |
51 | -1, -1, -1, -1, -1, -1, -1, -1, /* 50-57 */ | |
52 | -1, -1, -1, -1, -1, -1, -1, -1, /* 58-5f */ | |
53 | -1, 10, 11, 12, 13, 14, 15, -1, /* 60-67 */ | |
54 | -1, -1, -1, -1, -1, -1, -1, -1, /* 68-67 */ | |
55 | -1, -1, -1, -1, -1, -1, -1, -1, /* 70-77 */ | |
56 | -1, -1, -1, -1, -1, -1, -1, -1, /* 78-7f */ | |
57 | -1, -1, -1, -1, -1, -1, -1, -1, /* 80-87 */ | |
58 | -1, -1, -1, -1, -1, -1, -1, -1, /* 88-8f */ | |
59 | -1, -1, -1, -1, -1, -1, -1, -1, /* 90-97 */ | |
60 | -1, -1, -1, -1, -1, -1, -1, -1, /* 98-9f */ | |
61 | -1, -1, -1, -1, -1, -1, -1, -1, /* a0-a7 */ | |
62 | -1, -1, -1, -1, -1, -1, -1, -1, /* a8-af */ | |
63 | -1, -1, -1, -1, -1, -1, -1, -1, /* b0-b7 */ | |
64 | -1, -1, -1, -1, -1, -1, -1, -1, /* b8-bf */ | |
65 | -1, -1, -1, -1, -1, -1, -1, -1, /* c0-c7 */ | |
66 | -1, -1, -1, -1, -1, -1, -1, -1, /* c8-cf */ | |
67 | -1, -1, -1, -1, -1, -1, -1, -1, /* d0-d7 */ | |
68 | -1, -1, -1, -1, -1, -1, -1, -1, /* d8-df */ | |
69 | -1, -1, -1, -1, -1, -1, -1, -1, /* e0-e7 */ | |
70 | -1, -1, -1, -1, -1, -1, -1, -1, /* e8-ef */ | |
71 | -1, -1, -1, -1, -1, -1, -1, -1, /* f0-f7 */ | |
72 | -1, -1, -1, -1, -1, -1, -1, -1, /* f8-ff */ | |
73 | }; | |
0fcfd160 LT |
74 | |
75 | int get_sha1_hex(const char *hex, unsigned char *sha1) | |
76 | { | |
77 | int i; | |
78 | for (i = 0; i < 20; i++) { | |
79 | unsigned int val = (hexval(hex[0]) << 4) | hexval(hex[1]); | |
80 | if (val & ~0xff) | |
81 | return -1; | |
82 | *sha1++ = val; | |
83 | hex += 2; | |
84 | } | |
85 | return 0; | |
86 | } | |
87 | ||
b2cb9425 JH |
88 | int safe_create_leading_directories(char *path) |
89 | { | |
90 | char *pos = path; | |
67d42212 JR |
91 | struct stat st; |
92 | ||
85dadc38 | 93 | if (is_absolute_path(path)) |
67ffdf4c | 94 | pos++; |
b2cb9425 JH |
95 | |
96 | while (pos) { | |
97 | pos = strchr(pos, '/'); | |
98 | if (!pos) | |
99 | break; | |
100 | *pos = 0; | |
67d42212 JR |
101 | if (!stat(path, &st)) { |
102 | /* path exists */ | |
103 | if (!S_ISDIR(st.st_mode)) { | |
b2cb9425 | 104 | *pos = '/'; |
67d42212 | 105 | return -3; |
b2cb9425 | 106 | } |
457f06d6 | 107 | } |
67d42212 JR |
108 | else if (mkdir(path, 0777)) { |
109 | *pos = '/'; | |
110 | return -1; | |
111 | } | |
457f06d6 JS |
112 | else if (adjust_shared_perm(path)) { |
113 | *pos = '/'; | |
114 | return -2; | |
115 | } | |
b2cb9425 JH |
116 | *pos++ = '/'; |
117 | } | |
118 | return 0; | |
119 | } | |
723c31fe | 120 | |
0fcfd160 LT |
121 | char * sha1_to_hex(const unsigned char *sha1) |
122 | { | |
dcb3450f LT |
123 | static int bufno; |
124 | static char hexbuffer[4][50]; | |
0fcfd160 | 125 | static const char hex[] = "0123456789abcdef"; |
dcb3450f | 126 | char *buffer = hexbuffer[3 & ++bufno], *buf = buffer; |
0fcfd160 LT |
127 | int i; |
128 | ||
129 | for (i = 0; i < 20; i++) { | |
130 | unsigned int val = *sha1++; | |
131 | *buf++ = hex[val >> 4]; | |
132 | *buf++ = hex[val & 0xf]; | |
133 | } | |
1e80e044 JS |
134 | *buf = '\0'; |
135 | ||
0fcfd160 LT |
136 | return buffer; |
137 | } | |
138 | ||
ace1534d JH |
139 | static void fill_sha1_path(char *pathbuf, const unsigned char *sha1) |
140 | { | |
141 | int i; | |
142 | for (i = 0; i < 20; i++) { | |
143 | static char hex[] = "0123456789abcdef"; | |
144 | unsigned int val = sha1[i]; | |
145 | char *pos = pathbuf + i*2 + (i > 0); | |
146 | *pos++ = hex[val >> 4]; | |
147 | *pos = hex[val & 0xf]; | |
148 | } | |
149 | } | |
150 | ||
0fcfd160 LT |
151 | /* |
152 | * NOTE! This returns a statically allocated buffer, so you have to be | |
790296fd | 153 | * careful about using it. Do an "xstrdup()" if you need to save the |
0fcfd160 | 154 | * filename. |
ace1534d JH |
155 | * |
156 | * Also note that this returns the location for creating. Reading | |
157 | * SHA1 file can happen from any alternate directory listed in the | |
d19938ab | 158 | * DB_ENVIRONMENT environment variable if it is not found in |
ace1534d | 159 | * the primary object database. |
0fcfd160 LT |
160 | */ |
161 | char *sha1_file_name(const unsigned char *sha1) | |
162 | { | |
0fcfd160 LT |
163 | static char *name, *base; |
164 | ||
165 | if (!base) { | |
d19938ab | 166 | const char *sha1_file_directory = get_object_directory(); |
0fcfd160 | 167 | int len = strlen(sha1_file_directory); |
812666c8 | 168 | base = xmalloc(len + 60); |
0fcfd160 LT |
169 | memcpy(base, sha1_file_directory, len); |
170 | memset(base+len, 0, 60); | |
171 | base[len] = '/'; | |
172 | base[len+3] = '/'; | |
173 | name = base + len + 1; | |
174 | } | |
ace1534d | 175 | fill_sha1_path(name, sha1); |
0fcfd160 LT |
176 | return base; |
177 | } | |
178 | ||
633f43e1 | 179 | static char *sha1_get_pack_name(const unsigned char *sha1, |
6eec46bd | 180 | char **name, char **base, const char *which) |
bf592c50 DB |
181 | { |
182 | static const char hex[] = "0123456789abcdef"; | |
633f43e1 | 183 | char *buf; |
bf592c50 DB |
184 | int i; |
185 | ||
633f43e1 | 186 | if (!*base) { |
bf592c50 DB |
187 | const char *sha1_file_directory = get_object_directory(); |
188 | int len = strlen(sha1_file_directory); | |
633f43e1 | 189 | *base = xmalloc(len + 60); |
6eec46bd JH |
190 | sprintf(*base, "%s/pack/pack-1234567890123456789012345678901234567890.%s", |
191 | sha1_file_directory, which); | |
633f43e1 | 192 | *name = *base + len + 11; |
bf592c50 DB |
193 | } |
194 | ||
633f43e1 | 195 | buf = *name; |
bf592c50 DB |
196 | |
197 | for (i = 0; i < 20; i++) { | |
198 | unsigned int val = *sha1++; | |
199 | *buf++ = hex[val >> 4]; | |
200 | *buf++ = hex[val & 0xf]; | |
201 | } | |
a6080a0a | 202 | |
633f43e1 | 203 | return *base; |
bf592c50 DB |
204 | } |
205 | ||
633f43e1 | 206 | char *sha1_pack_name(const unsigned char *sha1) |
bf592c50 | 207 | { |
633f43e1 | 208 | static char *name, *base; |
bf592c50 | 209 | |
6eec46bd | 210 | return sha1_get_pack_name(sha1, &name, &base, "pack"); |
633f43e1 | 211 | } |
bf592c50 | 212 | |
633f43e1 HO |
213 | char *sha1_pack_index_name(const unsigned char *sha1) |
214 | { | |
215 | static char *name, *base; | |
a6080a0a | 216 | |
6eec46bd | 217 | return sha1_get_pack_name(sha1, &name, &base, "idx"); |
bf592c50 DB |
218 | } |
219 | ||
d5a63b99 JH |
220 | struct alternate_object_database *alt_odb_list; |
221 | static struct alternate_object_database **alt_odb_tail; | |
ace1534d | 222 | |
c2f493a4 MW |
223 | static void read_info_alternates(const char * alternates, int depth); |
224 | ||
ddd5d056 JH |
225 | /* |
226 | * Prepare alternate object database registry. | |
d5a63b99 JH |
227 | * |
228 | * The variable alt_odb_list points at the list of struct | |
229 | * alternate_object_database. The elements on this list come from | |
230 | * non-empty elements from colon separated ALTERNATE_DB_ENVIRONMENT | |
231 | * environment variable, and $GIT_OBJECT_DIRECTORY/info/alternates, | |
1494e038 JH |
232 | * whose contents is similar to that environment variable but can be |
233 | * LF separated. Its base points at a statically allocated buffer that | |
d5a63b99 JH |
234 | * contains "/the/directory/corresponding/to/.git/objects/...", while |
235 | * its name points just after the slash at the end of ".git/objects/" | |
236 | * in the example above, and has enough space to hold 40-byte hex | |
237 | * SHA1, an extra slash for the first level indirection, and the | |
238 | * terminating NUL. | |
ddd5d056 | 239 | */ |
c2f493a4 | 240 | static int link_alt_odb_entry(const char * entry, int len, const char * relative_base, int depth) |
ace1534d | 241 | { |
c2f493a4 | 242 | struct stat st; |
1494e038 | 243 | const char *objdir = get_object_directory(); |
c2f493a4 MW |
244 | struct alternate_object_database *ent; |
245 | struct alternate_object_database *alt; | |
246 | /* 43 = 40-byte + 2 '/' + terminating NUL */ | |
247 | int pfxlen = len; | |
248 | int entlen = pfxlen + 43; | |
ccfd3e99 | 249 | int base_len = -1; |
d5a63b99 | 250 | |
85dadc38 | 251 | if (!is_absolute_path(entry) && relative_base) { |
c2f493a4 MW |
252 | /* Relative alt-odb */ |
253 | if (base_len < 0) | |
254 | base_len = strlen(relative_base) + 1; | |
255 | entlen += base_len; | |
256 | pfxlen += base_len; | |
257 | } | |
258 | ent = xmalloc(sizeof(*ent) + entlen); | |
259 | ||
85dadc38 | 260 | if (!is_absolute_path(entry) && relative_base) { |
c2f493a4 MW |
261 | memcpy(ent->base, relative_base, base_len - 1); |
262 | ent->base[base_len - 1] = '/'; | |
263 | memcpy(ent->base + base_len, entry, len); | |
264 | } | |
265 | else | |
266 | memcpy(ent->base, entry, pfxlen); | |
267 | ||
268 | ent->name = ent->base + pfxlen + 1; | |
269 | ent->base[pfxlen + 3] = '/'; | |
270 | ent->base[pfxlen] = ent->base[entlen-1] = 0; | |
271 | ||
272 | /* Detect cases where alternate disappeared */ | |
273 | if (stat(ent->base, &st) || !S_ISDIR(st.st_mode)) { | |
274 | error("object directory %s does not exist; " | |
275 | "check .git/objects/info/alternates.", | |
276 | ent->base); | |
277 | free(ent); | |
278 | return -1; | |
279 | } | |
280 | ||
281 | /* Prevent the common mistake of listing the same | |
282 | * thing twice, or object directory itself. | |
283 | */ | |
284 | for (alt = alt_odb_list; alt; alt = alt->next) { | |
285 | if (!memcmp(ent->base, alt->base, pfxlen)) { | |
286 | free(ent); | |
287 | return -1; | |
288 | } | |
289 | } | |
290 | if (!memcmp(ent->base, objdir, pfxlen)) { | |
291 | free(ent); | |
292 | return -1; | |
293 | } | |
294 | ||
295 | /* add the alternate entry */ | |
296 | *alt_odb_tail = ent; | |
297 | alt_odb_tail = &(ent->next); | |
298 | ent->next = NULL; | |
299 | ||
300 | /* recursively add alternates */ | |
301 | read_info_alternates(ent->base, depth + 1); | |
302 | ||
303 | ent->base[pfxlen] = '/'; | |
304 | ||
305 | return 0; | |
306 | } | |
307 | ||
308 | static void link_alt_odb_entries(const char *alt, const char *ep, int sep, | |
309 | const char *relative_base, int depth) | |
310 | { | |
311 | const char *cp, *last; | |
312 | ||
313 | if (depth > 5) { | |
314 | error("%s: ignoring alternate object stores, nesting too deep.", | |
315 | relative_base); | |
316 | return; | |
317 | } | |
318 | ||
d5a63b99 | 319 | last = alt; |
9577e7e3 JH |
320 | while (last < ep) { |
321 | cp = last; | |
322 | if (cp < ep && *cp == '#') { | |
323 | while (cp < ep && *cp != sep) | |
324 | cp++; | |
325 | last = cp + 1; | |
326 | continue; | |
327 | } | |
c2f493a4 MW |
328 | while (cp < ep && *cp != sep) |
329 | cp++; | |
d5a63b99 | 330 | if (last != cp) { |
85dadc38 | 331 | if (!is_absolute_path(last) && depth) { |
c2f493a4 MW |
332 | error("%s: ignoring relative alternate object store %s", |
333 | relative_base, last); | |
334 | } else { | |
335 | link_alt_odb_entry(last, cp - last, | |
336 | relative_base, depth); | |
1494e038 | 337 | } |
d5a63b99 | 338 | } |
9577e7e3 | 339 | while (cp < ep && *cp == sep) |
d5a63b99 JH |
340 | cp++; |
341 | last = cp; | |
9577e7e3 | 342 | } |
d5a63b99 JH |
343 | } |
344 | ||
c2f493a4 | 345 | static void read_info_alternates(const char * relative_base, int depth) |
d5a63b99 | 346 | { |
9577e7e3 | 347 | char *map; |
dc49cd76 | 348 | size_t mapsz; |
d5a63b99 | 349 | struct stat st; |
9cb18f56 JM |
350 | const char alt_file_name[] = "info/alternates"; |
351 | /* Given that relative_base is no longer than PATH_MAX, | |
352 | ensure that "path" has enough space to append "/", the | |
353 | file name, "info/alternates", and a trailing NUL. */ | |
354 | char path[PATH_MAX + 1 + sizeof alt_file_name]; | |
c2f493a4 | 355 | int fd; |
d5a63b99 | 356 | |
9cb18f56 | 357 | sprintf(path, "%s/%s", relative_base, alt_file_name); |
d5a63b99 JH |
358 | fd = open(path, O_RDONLY); |
359 | if (fd < 0) | |
360 | return; | |
361 | if (fstat(fd, &st) || (st.st_size == 0)) { | |
362 | close(fd); | |
9a217f2a | 363 | return; |
ace1534d | 364 | } |
dc49cd76 SP |
365 | mapsz = xsize_t(st.st_size); |
366 | map = xmmap(NULL, mapsz, PROT_READ, MAP_PRIVATE, fd, 0); | |
d5a63b99 | 367 | close(fd); |
d5a63b99 | 368 | |
dc49cd76 | 369 | link_alt_odb_entries(map, map + mapsz, '\n', relative_base, depth); |
c2f493a4 | 370 | |
dc49cd76 | 371 | munmap(map, mapsz); |
ace1534d JH |
372 | } |
373 | ||
bef70b22 DB |
374 | void add_to_alternates_file(const char *reference) |
375 | { | |
376 | struct lock_file *lock = xcalloc(1, sizeof(struct lock_file)); | |
377 | int fd = hold_lock_file_for_append(lock, git_path("objects/info/alternates"), 1); | |
378 | char *alt = mkpath("%s/objects\n", reference); | |
379 | write_or_die(fd, alt, strlen(alt)); | |
380 | if (commit_lock_file(lock)) | |
381 | die("could not close alternates file"); | |
382 | if (alt_odb_tail) | |
383 | link_alt_odb_entries(alt, alt + strlen(alt), '\n', NULL, 0); | |
384 | } | |
385 | ||
c2f493a4 MW |
386 | void prepare_alt_odb(void) |
387 | { | |
554fe20d | 388 | const char *alt; |
c2f493a4 | 389 | |
7dc24aa5 SP |
390 | if (alt_odb_tail) |
391 | return; | |
392 | ||
c2f493a4 MW |
393 | alt = getenv(ALTERNATE_DB_ENVIRONMENT); |
394 | if (!alt) alt = ""; | |
395 | ||
c2f493a4 MW |
396 | alt_odb_tail = &alt_odb_list; |
397 | link_alt_odb_entries(alt, alt + strlen(alt), ':', NULL, 0); | |
398 | ||
399 | read_info_alternates(get_object_directory(), 0); | |
400 | } | |
401 | ||
ace1534d JH |
402 | static char *find_sha1_file(const unsigned char *sha1, struct stat *st) |
403 | { | |
ace1534d | 404 | char *name = sha1_file_name(sha1); |
d5a63b99 | 405 | struct alternate_object_database *alt; |
ace1534d JH |
406 | |
407 | if (!stat(name, st)) | |
408 | return name; | |
9a217f2a | 409 | prepare_alt_odb(); |
d5a63b99 JH |
410 | for (alt = alt_odb_list; alt; alt = alt->next) { |
411 | name = alt->name; | |
ace1534d | 412 | fill_sha1_path(name, sha1); |
d5a63b99 JH |
413 | if (!stat(alt->base, st)) |
414 | return alt->base; | |
ace1534d JH |
415 | } |
416 | return NULL; | |
417 | } | |
418 | ||
60bb8b14 | 419 | static unsigned int pack_used_ctr; |
a53128b6 SP |
420 | static unsigned int pack_mmap_calls; |
421 | static unsigned int peak_pack_open_windows; | |
422 | static unsigned int pack_open_windows; | |
423 | static size_t peak_pack_mapped; | |
60bb8b14 | 424 | static size_t pack_mapped; |
9a217f2a | 425 | struct packed_git *packed_git; |
1f688557 | 426 | |
b79d18c9 | 427 | void pack_report(void) |
a53128b6 SP |
428 | { |
429 | fprintf(stderr, | |
e05db0fd PR |
430 | "pack_report: getpagesize() = %10" SZ_FMT "\n" |
431 | "pack_report: core.packedGitWindowSize = %10" SZ_FMT "\n" | |
432 | "pack_report: core.packedGitLimit = %10" SZ_FMT "\n", | |
9e42d6a1 SP |
433 | sz_fmt(getpagesize()), |
434 | sz_fmt(packed_git_window_size), | |
435 | sz_fmt(packed_git_limit)); | |
a53128b6 SP |
436 | fprintf(stderr, |
437 | "pack_report: pack_used_ctr = %10u\n" | |
438 | "pack_report: pack_mmap_calls = %10u\n" | |
439 | "pack_report: pack_open_windows = %10u / %10u\n" | |
e05db0fd PR |
440 | "pack_report: pack_mapped = " |
441 | "%10" SZ_FMT " / %10" SZ_FMT "\n", | |
a53128b6 SP |
442 | pack_used_ctr, |
443 | pack_mmap_calls, | |
444 | pack_open_windows, peak_pack_open_windows, | |
9e42d6a1 | 445 | sz_fmt(pack_mapped), sz_fmt(peak_pack_mapped)); |
a53128b6 SP |
446 | } |
447 | ||
42873078 | 448 | static int check_packed_git_idx(const char *path, struct packed_git *p) |
1f688557 JH |
449 | { |
450 | void *idx_map; | |
42873078 | 451 | struct pack_idx_header *hdr; |
dc49cd76 | 452 | size_t idx_size; |
74e34e1f | 453 | uint32_t version, nr, i, *index; |
e93ec6f9 | 454 | int fd = open(path, O_RDONLY); |
1f688557 | 455 | struct stat st; |
42873078 | 456 | |
1f688557 JH |
457 | if (fd < 0) |
458 | return -1; | |
459 | if (fstat(fd, &st)) { | |
460 | close(fd); | |
461 | return -1; | |
462 | } | |
dc49cd76 | 463 | idx_size = xsize_t(st.st_size); |
2d88451b SP |
464 | if (idx_size < 4 * 256 + 20 + 20) { |
465 | close(fd); | |
466 | return error("index file %s is too small", path); | |
467 | } | |
c4712e45 | 468 | idx_map = xmmap(NULL, idx_size, PROT_READ, MAP_PRIVATE, fd, 0); |
1f688557 | 469 | close(fd); |
1f688557 | 470 | |
42873078 NP |
471 | hdr = idx_map; |
472 | if (hdr->idx_signature == htonl(PACK_IDX_SIGNATURE)) { | |
74e34e1f NP |
473 | version = ntohl(hdr->idx_version); |
474 | if (version < 2 || version > 2) { | |
475 | munmap(idx_map, idx_size); | |
476 | return error("index file %s is version %d" | |
477 | " and is not supported by this binary" | |
478 | " (try upgrading GIT to a newer version)", | |
479 | path, version); | |
480 | } | |
481 | } else | |
482 | version = 1; | |
df1b059d | 483 | |
1f688557 | 484 | nr = 0; |
42873078 | 485 | index = idx_map; |
74e34e1f NP |
486 | if (version > 1) |
487 | index += 2; /* skip index header */ | |
1f688557 | 488 | for (i = 0; i < 256; i++) { |
326bf396 | 489 | uint32_t n = ntohl(index[i]); |
2d88451b SP |
490 | if (n < nr) { |
491 | munmap(idx_map, idx_size); | |
df1b059d | 492 | return error("non-monotonic index %s", path); |
2d88451b | 493 | } |
1f688557 JH |
494 | nr = n; |
495 | } | |
496 | ||
74e34e1f NP |
497 | if (version == 1) { |
498 | /* | |
499 | * Total size: | |
500 | * - 256 index entries 4 bytes each | |
501 | * - 24-byte entries * nr (20-byte sha1 + 4-byte offset) | |
502 | * - 20-byte SHA1 of the packfile | |
503 | * - 20-byte SHA1 file checksum | |
504 | */ | |
505 | if (idx_size != 4*256 + nr * 24 + 20 + 20) { | |
506 | munmap(idx_map, idx_size); | |
eef427a0 | 507 | return error("wrong index v1 file size in %s", path); |
74e34e1f NP |
508 | } |
509 | } else if (version == 2) { | |
510 | /* | |
511 | * Minimum size: | |
512 | * - 8 bytes of header | |
513 | * - 256 index entries 4 bytes each | |
514 | * - 20-byte sha1 entry * nr | |
515 | * - 4-byte crc entry * nr | |
516 | * - 4-byte offset entry * nr | |
517 | * - 20-byte SHA1 of the packfile | |
518 | * - 20-byte SHA1 file checksum | |
519 | * And after the 4-byte offset table might be a | |
520 | * variable sized table containing 8-byte entries | |
521 | * for offsets larger than 2^31. | |
522 | */ | |
523 | unsigned long min_size = 8 + 4*256 + nr*(20 + 4 + 4) + 20 + 20; | |
1164f1e4 LT |
524 | unsigned long max_size = min_size; |
525 | if (nr) | |
526 | max_size += (nr - 1)*8; | |
527 | if (idx_size < min_size || idx_size > max_size) { | |
74e34e1f | 528 | munmap(idx_map, idx_size); |
eef427a0 | 529 | return error("wrong index v2 file size in %s", path); |
74e34e1f | 530 | } |
7109c889 JH |
531 | if (idx_size != min_size && |
532 | /* | |
533 | * make sure we can deal with large pack offsets. | |
534 | * 31-bit signed offset won't be enough, neither | |
535 | * 32-bit unsigned one will be. | |
536 | */ | |
537 | (sizeof(off_t) <= 4)) { | |
538 | munmap(idx_map, idx_size); | |
539 | return error("pack too large for current definition of off_t in %s", path); | |
74e34e1f | 540 | } |
2d88451b | 541 | } |
1f688557 | 542 | |
74e34e1f | 543 | p->index_version = version; |
42873078 NP |
544 | p->index_data = idx_map; |
545 | p->index_size = idx_size; | |
57059091 | 546 | p->num_objects = nr; |
1f688557 JH |
547 | return 0; |
548 | } | |
549 | ||
bc8e478a | 550 | int open_pack_index(struct packed_git *p) |
d079837e SP |
551 | { |
552 | char *idx_name; | |
553 | int ret; | |
554 | ||
555 | if (p->index_data) | |
556 | return 0; | |
557 | ||
558 | idx_name = xstrdup(p->pack_name); | |
559 | strcpy(idx_name + strlen(idx_name) - strlen(".pack"), ".idx"); | |
560 | ret = check_packed_git_idx(idx_name, p); | |
561 | free(idx_name); | |
562 | return ret; | |
563 | } | |
564 | ||
11daf39b SP |
565 | static void scan_windows(struct packed_git *p, |
566 | struct packed_git **lru_p, | |
567 | struct pack_window **lru_w, | |
568 | struct pack_window **lru_l) | |
1f688557 | 569 | { |
11daf39b SP |
570 | struct pack_window *w, *w_l; |
571 | ||
572 | for (w_l = NULL, w = p->windows; w; w = w->next) { | |
573 | if (!w->inuse_cnt) { | |
574 | if (!*lru_w || w->last_used < (*lru_w)->last_used) { | |
575 | *lru_p = p; | |
576 | *lru_w = w; | |
577 | *lru_l = w_l; | |
54044bf8 | 578 | } |
54044bf8 | 579 | } |
11daf39b | 580 | w_l = w; |
f9253394 | 581 | } |
11daf39b SP |
582 | } |
583 | ||
d1efefa4 | 584 | static int unuse_one_window(struct packed_git *current, int keep_fd) |
11daf39b SP |
585 | { |
586 | struct packed_git *p, *lru_p = NULL; | |
587 | struct pack_window *lru_w = NULL, *lru_l = NULL; | |
588 | ||
589 | if (current) | |
590 | scan_windows(current, &lru_p, &lru_w, &lru_l); | |
591 | for (p = packed_git; p; p = p->next) | |
592 | scan_windows(p, &lru_p, &lru_w, &lru_l); | |
54044bf8 SP |
593 | if (lru_p) { |
594 | munmap(lru_w->base, lru_w->len); | |
595 | pack_mapped -= lru_w->len; | |
596 | if (lru_l) | |
597 | lru_l->next = lru_w->next; | |
598 | else { | |
599 | lru_p->windows = lru_w->next; | |
d1efefa4 | 600 | if (!lru_p->windows && lru_p->pack_fd != keep_fd) { |
54044bf8 SP |
601 | close(lru_p->pack_fd); |
602 | lru_p->pack_fd = -1; | |
603 | } | |
604 | } | |
605 | free(lru_w); | |
a53128b6 | 606 | pack_open_windows--; |
54044bf8 SP |
607 | return 1; |
608 | } | |
609 | return 0; | |
f9253394 JH |
610 | } |
611 | ||
d1efefa4 | 612 | void release_pack_memory(size_t need, int fd) |
97bfeb34 SP |
613 | { |
614 | size_t cur = pack_mapped; | |
d1efefa4 | 615 | while (need >= (cur - pack_mapped) && unuse_one_window(NULL, fd)) |
97bfeb34 SP |
616 | ; /* nothing */ |
617 | } | |
618 | ||
c9ced051 SP |
619 | void close_pack_windows(struct packed_git *p) |
620 | { | |
621 | while (p->windows) { | |
622 | struct pack_window *w = p->windows; | |
623 | ||
624 | if (w->inuse_cnt) | |
625 | die("pack '%s' still has open windows to it", | |
626 | p->pack_name); | |
627 | munmap(w->base, w->len); | |
628 | pack_mapped -= w->len; | |
629 | pack_open_windows--; | |
630 | p->windows = w->next; | |
631 | free(w); | |
632 | } | |
633 | } | |
634 | ||
03e79c88 | 635 | void unuse_pack(struct pack_window **w_cursor) |
f9253394 | 636 | { |
03e79c88 SP |
637 | struct pack_window *w = *w_cursor; |
638 | if (w) { | |
639 | w->inuse_cnt--; | |
640 | *w_cursor = NULL; | |
641 | } | |
1f688557 JH |
642 | } |
643 | ||
3cf8b462 SP |
644 | /* |
645 | * Do not call this directly as this leaks p->pack_fd on error return; | |
646 | * call open_packed_git() instead. | |
647 | */ | |
648 | static int open_packed_git_1(struct packed_git *p) | |
1f688557 | 649 | { |
9bc879c1 SP |
650 | struct stat st; |
651 | struct pack_header hdr; | |
652 | unsigned char sha1[20]; | |
653 | unsigned char *idx_sha1; | |
2c039da8 | 654 | long fd_flag; |
9bc879c1 | 655 | |
d079837e SP |
656 | if (!p->index_data && open_pack_index(p)) |
657 | return error("packfile %s index unavailable", p->pack_name); | |
658 | ||
9bc879c1 SP |
659 | p->pack_fd = open(p->pack_name, O_RDONLY); |
660 | if (p->pack_fd < 0 || fstat(p->pack_fd, &st)) | |
072db278 | 661 | return -1; |
9bc879c1 SP |
662 | |
663 | /* If we created the struct before we had the pack we lack size. */ | |
bf592c50 | 664 | if (!p->pack_size) { |
bf592c50 | 665 | if (!S_ISREG(st.st_mode)) |
072db278 | 666 | return error("packfile %s not a regular file", p->pack_name); |
bf592c50 | 667 | p->pack_size = st.st_size; |
9bc879c1 | 668 | } else if (p->pack_size != st.st_size) |
072db278 | 669 | return error("packfile %s size changed", p->pack_name); |
9bc879c1 | 670 | |
2c039da8 JH |
671 | /* We leave these file descriptors open with sliding mmap; |
672 | * there is no point keeping them open across exec(), though. | |
673 | */ | |
674 | fd_flag = fcntl(p->pack_fd, F_GETFD, 0); | |
675 | if (fd_flag < 0) | |
072db278 | 676 | return error("cannot determine file descriptor flags"); |
2c039da8 JH |
677 | fd_flag |= FD_CLOEXEC; |
678 | if (fcntl(p->pack_fd, F_SETFD, fd_flag) == -1) | |
072db278 | 679 | return error("cannot set FD_CLOEXEC"); |
2c039da8 | 680 | |
9bc879c1 | 681 | /* Verify we recognize this pack file format. */ |
e6e2bd62 | 682 | if (read_in_full(p->pack_fd, &hdr, sizeof(hdr)) != sizeof(hdr)) |
072db278 | 683 | return error("file %s is far too short to be a packfile", p->pack_name); |
9bc879c1 | 684 | if (hdr.hdr_signature != htonl(PACK_SIGNATURE)) |
072db278 | 685 | return error("file %s is not a GIT packfile", p->pack_name); |
9bc879c1 | 686 | if (!pack_version_ok(hdr.hdr_version)) |
072db278 | 687 | return error("packfile %s is version %u and not supported" |
9bc879c1 SP |
688 | " (try upgrading GIT to a newer version)", |
689 | p->pack_name, ntohl(hdr.hdr_version)); | |
690 | ||
691 | /* Verify the pack matches its index. */ | |
57059091 | 692 | if (p->num_objects != ntohl(hdr.hdr_entries)) |
072db278 | 693 | return error("packfile %s claims to have %u objects" |
57059091 NP |
694 | " while index indicates %u objects", |
695 | p->pack_name, ntohl(hdr.hdr_entries), | |
696 | p->num_objects); | |
9bc879c1 | 697 | if (lseek(p->pack_fd, p->pack_size - sizeof(sha1), SEEK_SET) == -1) |
072db278 | 698 | return error("end of packfile %s is unavailable", p->pack_name); |
e6e2bd62 | 699 | if (read_in_full(p->pack_fd, sha1, sizeof(sha1)) != sizeof(sha1)) |
072db278 | 700 | return error("packfile %s signature is unavailable", p->pack_name); |
42873078 | 701 | idx_sha1 = ((unsigned char *)p->index_data) + p->index_size - 40; |
9bc879c1 | 702 | if (hashcmp(sha1, idx_sha1)) |
072db278 SP |
703 | return error("packfile %s does not match index", p->pack_name); |
704 | return 0; | |
9bc879c1 SP |
705 | } |
706 | ||
3cf8b462 SP |
707 | static int open_packed_git(struct packed_git *p) |
708 | { | |
709 | if (!open_packed_git_1(p)) | |
710 | return 0; | |
711 | if (p->pack_fd != -1) { | |
712 | close(p->pack_fd); | |
713 | p->pack_fd = -1; | |
714 | } | |
715 | return -1; | |
716 | } | |
717 | ||
c4001d92 | 718 | static int in_window(struct pack_window *win, off_t offset) |
60bb8b14 SP |
719 | { |
720 | /* We must promise at least 20 bytes (one hash) after the | |
721 | * offset is available from this window, otherwise the offset | |
722 | * is not actually in this window and a different window (which | |
723 | * has that one hash excess) must be used. This is to support | |
724 | * the object header and delta base parsing routines below. | |
725 | */ | |
726 | off_t win_off = win->offset; | |
727 | return win_off <= offset | |
728 | && (offset + 20) <= (win_off + win->len); | |
729 | } | |
730 | ||
03e79c88 SP |
731 | unsigned char* use_pack(struct packed_git *p, |
732 | struct pack_window **w_cursor, | |
c4001d92 | 733 | off_t offset, |
03e79c88 | 734 | unsigned int *left) |
9bc879c1 | 735 | { |
60bb8b14 | 736 | struct pack_window *win = *w_cursor; |
03e79c88 | 737 | |
072db278 SP |
738 | if (p->pack_fd == -1 && open_packed_git(p)) |
739 | die("packfile %s cannot be accessed", p->pack_name); | |
60bb8b14 SP |
740 | |
741 | /* Since packfiles end in a hash of their content and its | |
742 | * pointless to ask for an offset into the middle of that | |
743 | * hash, and the in_window function above wouldn't match | |
744 | * don't allow an offset too close to the end of the file. | |
745 | */ | |
746 | if (offset > (p->pack_size - 20)) | |
747 | die("offset beyond end of packfile (truncated pack?)"); | |
748 | ||
749 | if (!win || !in_window(win, offset)) { | |
750 | if (win) | |
751 | win->inuse_cnt--; | |
752 | for (win = p->windows; win; win = win->next) { | |
753 | if (in_window(win, offset)) | |
754 | break; | |
755 | } | |
756 | if (!win) { | |
78a28df9 | 757 | size_t window_align = packed_git_window_size / 2; |
dc49cd76 | 758 | off_t len; |
60bb8b14 | 759 | win = xcalloc(1, sizeof(*win)); |
78a28df9 | 760 | win->offset = (offset / window_align) * window_align; |
dc49cd76 SP |
761 | len = p->pack_size - win->offset; |
762 | if (len > packed_git_window_size) | |
763 | len = packed_git_window_size; | |
764 | win->len = (size_t)len; | |
60bb8b14 | 765 | pack_mapped += win->len; |
11daf39b | 766 | while (packed_git_limit < pack_mapped |
d1efefa4 | 767 | && unuse_one_window(p, p->pack_fd)) |
60bb8b14 | 768 | ; /* nothing */ |
c4712e45 | 769 | win->base = xmmap(NULL, win->len, |
60bb8b14 SP |
770 | PROT_READ, MAP_PRIVATE, |
771 | p->pack_fd, win->offset); | |
772 | if (win->base == MAP_FAILED) | |
73b4e4be SP |
773 | die("packfile %s cannot be mapped: %s", |
774 | p->pack_name, | |
775 | strerror(errno)); | |
a53128b6 SP |
776 | pack_mmap_calls++; |
777 | pack_open_windows++; | |
778 | if (pack_mapped > peak_pack_mapped) | |
779 | peak_pack_mapped = pack_mapped; | |
780 | if (pack_open_windows > peak_pack_open_windows) | |
781 | peak_pack_open_windows = pack_open_windows; | |
60bb8b14 SP |
782 | win->next = p->windows; |
783 | p->windows = win; | |
784 | } | |
1f688557 | 785 | } |
03e79c88 SP |
786 | if (win != *w_cursor) { |
787 | win->last_used = pack_used_ctr++; | |
788 | win->inuse_cnt++; | |
789 | *w_cursor = win; | |
790 | } | |
60bb8b14 | 791 | offset -= win->offset; |
03e79c88 | 792 | if (left) |
dc49cd76 | 793 | *left = win->len - xsize_t(offset); |
03e79c88 | 794 | return win->base + offset; |
1f688557 JH |
795 | } |
796 | ||
42873078 | 797 | struct packed_git *add_packed_git(const char *path, int path_len, int local) |
1f688557 JH |
798 | { |
799 | struct stat st; | |
42873078 | 800 | struct packed_git *p = xmalloc(sizeof(*p) + path_len + 2); |
1f688557 | 801 | |
42873078 NP |
802 | /* |
803 | * Make sure a corresponding .pack file exists and that | |
804 | * the index looks sane. | |
805 | */ | |
806 | path_len -= strlen(".idx"); | |
807 | if (path_len < 1) | |
1f688557 | 808 | return NULL; |
42873078 NP |
809 | memcpy(p->pack_name, path, path_len); |
810 | strcpy(p->pack_name + path_len, ".pack"); | |
d079837e | 811 | if (stat(p->pack_name, &st) || !S_ISREG(st.st_mode)) { |
42873078 | 812 | free(p); |
1f688557 JH |
813 | return NULL; |
814 | } | |
42873078 | 815 | |
1f688557 JH |
816 | /* ok, it looks sane as far as we can check without |
817 | * actually mapping the pack file. | |
818 | */ | |
d079837e SP |
819 | p->index_version = 0; |
820 | p->index_data = NULL; | |
821 | p->index_size = 0; | |
822 | p->num_objects = 0; | |
1f688557 | 823 | p->pack_size = st.st_size; |
1f688557 | 824 | p->next = NULL; |
c41ee586 | 825 | p->windows = NULL; |
9bc879c1 | 826 | p->pack_fd = -1; |
9d835df2 | 827 | p->pack_local = local; |
b867092f | 828 | p->mtime = st.st_mtime; |
42873078 NP |
829 | if (path_len < 40 || get_sha1_hex(path + path_len - 40, p->sha1)) |
830 | hashclr(p->sha1); | |
1f688557 JH |
831 | return p; |
832 | } | |
833 | ||
bf592c50 | 834 | struct packed_git *parse_pack_index(unsigned char *sha1) |
c508df5e DB |
835 | { |
836 | char *path = sha1_pack_index_name(sha1); | |
837 | return parse_pack_index_file(sha1, path); | |
838 | } | |
839 | ||
42873078 NP |
840 | struct packed_git *parse_pack_index_file(const unsigned char *sha1, |
841 | const char *idx_path) | |
bf592c50 | 842 | { |
42873078 NP |
843 | const char *path = sha1_pack_name(sha1); |
844 | struct packed_git *p = xmalloc(sizeof(*p) + strlen(path) + 2); | |
bf592c50 | 845 | |
42873078 NP |
846 | if (check_packed_git_idx(idx_path, p)) { |
847 | free(p); | |
bf592c50 | 848 | return NULL; |
42873078 | 849 | } |
bf592c50 | 850 | |
bf592c50 | 851 | strcpy(p->pack_name, path); |
bf592c50 | 852 | p->pack_size = 0; |
bf592c50 | 853 | p->next = NULL; |
c41ee586 | 854 | p->windows = NULL; |
9bc879c1 | 855 | p->pack_fd = -1; |
e702496e | 856 | hashcpy(p->sha1, sha1); |
bf592c50 DB |
857 | return p; |
858 | } | |
859 | ||
860 | void install_packed_git(struct packed_git *pack) | |
861 | { | |
862 | pack->next = packed_git; | |
863 | packed_git = pack; | |
864 | } | |
865 | ||
9d835df2 | 866 | static void prepare_packed_git_one(char *objdir, int local) |
1f688557 | 867 | { |
9cb18f56 JM |
868 | /* Ensure that this buffer is large enough so that we can |
869 | append "/pack/" without clobbering the stack even if | |
870 | strlen(objdir) were PATH_MAX. */ | |
871 | char path[PATH_MAX + 1 + 4 + 1 + 1]; | |
1f688557 JH |
872 | int len; |
873 | DIR *dir; | |
874 | struct dirent *de; | |
875 | ||
876 | sprintf(path, "%s/pack", objdir); | |
877 | len = strlen(path); | |
878 | dir = opendir(path); | |
b5b16990 | 879 | if (!dir) { |
26125f6b | 880 | if (errno != ENOENT) |
bd2afde8 | 881 | error("unable to open object pack directory: %s: %s", |
26125f6b | 882 | path, strerror(errno)); |
1f688557 | 883 | return; |
b5b16990 | 884 | } |
1f688557 JH |
885 | path[len++] = '/'; |
886 | while ((de = readdir(dir)) != NULL) { | |
887 | int namelen = strlen(de->d_name); | |
888 | struct packed_git *p; | |
889 | ||
5bb1cda5 | 890 | if (!has_extension(de->d_name, ".idx")) |
1f688557 JH |
891 | continue; |
892 | ||
9cb18f56 JM |
893 | if (len + namelen + 1 > sizeof(path)) |
894 | continue; | |
895 | ||
54a15a8d | 896 | /* Don't reopen a pack we already have. */ |
1f688557 | 897 | strcpy(path + len, de->d_name); |
86f7780c JK |
898 | for (p = packed_git; p; p = p->next) { |
899 | if (!memcmp(path, p->pack_name, len + namelen - 4)) | |
900 | break; | |
901 | } | |
902 | if (p) | |
903 | continue; | |
54a15a8d SP |
904 | /* See if it really is a valid .idx file with corresponding |
905 | * .pack file that we can map. | |
906 | */ | |
9d835df2 | 907 | p = add_packed_git(path, len + namelen, local); |
1f688557 JH |
908 | if (!p) |
909 | continue; | |
625e9421 | 910 | install_packed_git(p); |
1f688557 | 911 | } |
5b35bcd5 | 912 | closedir(dir); |
1f688557 JH |
913 | } |
914 | ||
b867092f JH |
915 | static int sort_pack(const void *a_, const void *b_) |
916 | { | |
917 | struct packed_git *a = *((struct packed_git **)a_); | |
918 | struct packed_git *b = *((struct packed_git **)b_); | |
919 | int st; | |
920 | ||
921 | /* | |
922 | * Local packs tend to contain objects specific to our | |
923 | * variant of the project than remote ones. In addition, | |
924 | * remote ones could be on a network mounted filesystem. | |
925 | * Favor local ones for these reasons. | |
926 | */ | |
927 | st = a->pack_local - b->pack_local; | |
928 | if (st) | |
929 | return -st; | |
930 | ||
931 | /* | |
932 | * Younger packs tend to contain more recent objects, | |
933 | * and more recent objects tend to get accessed more | |
934 | * often. | |
935 | */ | |
936 | if (a->mtime < b->mtime) | |
937 | return 1; | |
938 | else if (a->mtime == b->mtime) | |
939 | return 0; | |
940 | return -1; | |
941 | } | |
942 | ||
943 | static void rearrange_packed_git(void) | |
944 | { | |
945 | struct packed_git **ary, *p; | |
946 | int i, n; | |
947 | ||
948 | for (n = 0, p = packed_git; p; p = p->next) | |
949 | n++; | |
950 | if (n < 2) | |
951 | return; | |
952 | ||
953 | /* prepare an array of packed_git for easier sorting */ | |
954 | ary = xcalloc(n, sizeof(struct packed_git *)); | |
955 | for (n = 0, p = packed_git; p; p = p->next) | |
956 | ary[n++] = p; | |
957 | ||
958 | qsort(ary, n, sizeof(struct packed_git *), sort_pack); | |
959 | ||
960 | /* link them back again */ | |
961 | for (i = 0; i < n - 1; i++) | |
962 | ary[i]->next = ary[i + 1]; | |
963 | ary[n - 1]->next = NULL; | |
964 | packed_git = ary[0]; | |
965 | ||
966 | free(ary); | |
967 | } | |
968 | ||
637cdd9d | 969 | static int prepare_packed_git_run_once = 0; |
9a217f2a | 970 | void prepare_packed_git(void) |
1f688557 | 971 | { |
d5a63b99 | 972 | struct alternate_object_database *alt; |
1f688557 | 973 | |
637cdd9d | 974 | if (prepare_packed_git_run_once) |
1f688557 | 975 | return; |
9d835df2 | 976 | prepare_packed_git_one(get_object_directory(), 1); |
9a217f2a | 977 | prepare_alt_odb(); |
d5a63b99 | 978 | for (alt = alt_odb_list; alt; alt = alt->next) { |
1494e038 | 979 | alt->name[-1] = 0; |
9d835df2 | 980 | prepare_packed_git_one(alt->base, 0); |
1494e038 | 981 | alt->name[-1] = '/'; |
1f688557 | 982 | } |
b867092f | 983 | rearrange_packed_git(); |
637cdd9d JK |
984 | prepare_packed_git_run_once = 1; |
985 | } | |
986 | ||
fc04c412 | 987 | void reprepare_packed_git(void) |
637cdd9d JK |
988 | { |
989 | prepare_packed_git_run_once = 0; | |
990 | prepare_packed_git(); | |
1f688557 JH |
991 | } |
992 | ||
5d6ccf5c | 993 | int check_sha1_signature(const unsigned char *sha1, void *map, unsigned long size, const char *type) |
0fcfd160 LT |
994 | { |
995 | unsigned char real_sha1[20]; | |
7cfb5f36 | 996 | hash_sha1_file(map, size, type, real_sha1); |
a89fccd2 | 997 | return hashcmp(sha1, real_sha1) ? -1 : 0; |
0fcfd160 LT |
998 | } |
999 | ||
4175e9e3 | 1000 | static void *map_sha1_file(const unsigned char *sha1, unsigned long *size) |
0fcfd160 | 1001 | { |
0fcfd160 LT |
1002 | struct stat st; |
1003 | void *map; | |
144bde78 | 1004 | int fd; |
ace1534d JH |
1005 | char *filename = find_sha1_file(sha1, &st); |
1006 | ||
1007 | if (!filename) { | |
ace1534d JH |
1008 | return NULL; |
1009 | } | |
0fcfd160 | 1010 | |
144bde78 | 1011 | fd = open(filename, O_RDONLY | sha1_file_open_flag); |
0fcfd160 | 1012 | if (fd < 0) { |
144bde78 LT |
1013 | /* See if it works without O_NOATIME */ |
1014 | switch (sha1_file_open_flag) { | |
1015 | default: | |
1016 | fd = open(filename, O_RDONLY); | |
1017 | if (fd >= 0) | |
1018 | break; | |
1019 | /* Fallthrough */ | |
1020 | case 0: | |
144bde78 LT |
1021 | return NULL; |
1022 | } | |
1023 | ||
1f688557 JH |
1024 | /* If it failed once, it will probably fail again. |
1025 | * Stop using O_NOATIME | |
1026 | */ | |
144bde78 | 1027 | sha1_file_open_flag = 0; |
0fcfd160 | 1028 | } |
dc49cd76 SP |
1029 | *size = xsize_t(st.st_size); |
1030 | map = xmmap(NULL, *size, PROT_READ, MAP_PRIVATE, fd, 0); | |
0fcfd160 | 1031 | close(fd); |
0fcfd160 LT |
1032 | return map; |
1033 | } | |
1034 | ||
726f852b | 1035 | static int legacy_loose_object(unsigned char *map) |
bb6b8e4f JH |
1036 | { |
1037 | unsigned int word; | |
1038 | ||
1039 | /* | |
1040 | * Is it a zlib-compressed buffer? If so, the first byte | |
1041 | * must be 0x78 (15-bit window size, deflated), and the | |
1042 | * first 16-bit word is evenly divisible by 31 | |
1043 | */ | |
1044 | word = (map[0] << 8) + map[1]; | |
1045 | if (map[0] == 0x78 && !(word % 31)) | |
1046 | return 1; | |
1047 | else | |
1048 | return 0; | |
1049 | } | |
1050 | ||
72518e9c | 1051 | unsigned long unpack_object_header_gently(const unsigned char *buf, unsigned long len, enum object_type *type, unsigned long *sizep) |
c4483576 | 1052 | { |
ad1ed5ee | 1053 | unsigned shift; |
93821bd9 | 1054 | unsigned char c; |
93821bd9 | 1055 | unsigned long size; |
ad1ed5ee JH |
1056 | unsigned long used = 0; |
1057 | ||
1058 | c = buf[used++]; | |
1059 | *type = (c >> 4) & 7; | |
1060 | size = c & 15; | |
1061 | shift = 4; | |
1062 | while (c & 0x80) { | |
1063 | if (len <= used) | |
1064 | return 0; | |
1065 | if (sizeof(long) * 8 <= shift) | |
1066 | return 0; | |
1067 | c = buf[used++]; | |
1068 | size += (c & 0x7f) << shift; | |
1069 | shift += 7; | |
1070 | } | |
1071 | *sizep = size; | |
1072 | return used; | |
1073 | } | |
1074 | ||
1075 | static int unpack_sha1_header(z_stream *stream, unsigned char *map, unsigned long mapsize, void *buffer, unsigned long bufsiz) | |
1076 | { | |
1077 | unsigned long size, used; | |
1078 | static const char valid_loose_object_type[8] = { | |
1079 | 0, /* OBJ_EXT */ | |
1080 | 1, 1, 1, 1, /* "commit", "tree", "blob", "tag" */ | |
1081 | 0, /* "delta" and others are invalid in a loose object */ | |
93821bd9 | 1082 | }; |
ad1ed5ee | 1083 | enum object_type type; |
93821bd9 | 1084 | |
c4483576 LT |
1085 | /* Get the data stream */ |
1086 | memset(stream, 0, sizeof(*stream)); | |
1087 | stream->next_in = map; | |
1088 | stream->avail_in = mapsize; | |
1089 | stream->next_out = buffer; | |
93821bd9 LT |
1090 | stream->avail_out = bufsiz; |
1091 | ||
bb6b8e4f | 1092 | if (legacy_loose_object(map)) { |
93821bd9 LT |
1093 | inflateInit(stream); |
1094 | return inflate(stream, 0); | |
1095 | } | |
1096 | ||
726f852b NP |
1097 | |
1098 | /* | |
1099 | * There used to be a second loose object header format which | |
1100 | * was meant to mimic the in-pack format, allowing for direct | |
1101 | * copy of the object data. This format turned up not to be | |
1102 | * really worth it and we don't write it any longer. But we | |
1103 | * can still read it. | |
1104 | */ | |
ad1ed5ee JH |
1105 | used = unpack_object_header_gently(map, mapsize, &type, &size); |
1106 | if (!used || !valid_loose_object_type[type]) | |
93821bd9 | 1107 | return -1; |
ad1ed5ee JH |
1108 | map += used; |
1109 | mapsize -= used; | |
93821bd9 LT |
1110 | |
1111 | /* Set up the stream for the rest.. */ | |
1112 | stream->next_in = map; | |
1113 | stream->avail_in = mapsize; | |
c4483576 | 1114 | inflateInit(stream); |
93821bd9 LT |
1115 | |
1116 | /* And generate the fake traditional header */ | |
ad1ed5ee | 1117 | stream->total_out = 1 + snprintf(buffer, bufsiz, "%s %lu", |
df843662 | 1118 | typename(type), size); |
93821bd9 | 1119 | return 0; |
c4483576 LT |
1120 | } |
1121 | ||
7efbff75 | 1122 | static void *unpack_sha1_rest(z_stream *stream, void *buffer, unsigned long size, const unsigned char *sha1) |
5180cacc LT |
1123 | { |
1124 | int bytes = strlen(buffer) + 1; | |
d565b341 | 1125 | unsigned char *buf = xmalloc(1+size); |
93821bd9 | 1126 | unsigned long n; |
7efbff75 | 1127 | int status = Z_OK; |
5180cacc | 1128 | |
93821bd9 LT |
1129 | n = stream->total_out - bytes; |
1130 | if (n > size) | |
1131 | n = size; | |
1132 | memcpy(buf, (char *) buffer + bytes, n); | |
1133 | bytes = n; | |
456cdf6e LT |
1134 | if (bytes <= size) { |
1135 | /* | |
1136 | * The above condition must be (bytes <= size), not | |
1137 | * (bytes < size). In other words, even though we | |
1138 | * expect no more output and set avail_out to zer0, | |
1139 | * the input zlib stream may have bytes that express | |
1140 | * "this concludes the stream", and we *do* want to | |
1141 | * eat that input. | |
1142 | * | |
1143 | * Otherwise we would not be able to test that we | |
1144 | * consumed all the input to reach the expected size; | |
1145 | * we also want to check that zlib tells us that all | |
1146 | * went well with status == Z_STREAM_END at the end. | |
1147 | */ | |
5180cacc LT |
1148 | stream->next_out = buf + bytes; |
1149 | stream->avail_out = size - bytes; | |
7efbff75 JH |
1150 | while (status == Z_OK) |
1151 | status = inflate(stream, Z_FINISH); | |
5180cacc LT |
1152 | } |
1153 | buf[size] = 0; | |
456cdf6e | 1154 | if (status == Z_STREAM_END && !stream->avail_in) { |
7efbff75 JH |
1155 | inflateEnd(stream); |
1156 | return buf; | |
1157 | } | |
1158 | ||
1159 | if (status < 0) | |
1160 | error("corrupt loose object '%s'", sha1_to_hex(sha1)); | |
1161 | else if (stream->avail_in) | |
1162 | error("garbage at end of loose object '%s'", | |
1163 | sha1_to_hex(sha1)); | |
1164 | free(buf); | |
1165 | return NULL; | |
5180cacc LT |
1166 | } |
1167 | ||
1168 | /* | |
1169 | * We used to just use "sscanf()", but that's actually way | |
1170 | * too permissive for what we want to check. So do an anal | |
1171 | * object header parse by hand. | |
1172 | */ | |
21666f1a | 1173 | static int parse_sha1_header(const char *hdr, unsigned long *sizep) |
5180cacc | 1174 | { |
21666f1a | 1175 | char type[10]; |
5180cacc LT |
1176 | int i; |
1177 | unsigned long size; | |
1178 | ||
1179 | /* | |
a6080a0a | 1180 | * The type can be at most ten bytes (including the |
5180cacc | 1181 | * terminating '\0' that we add), and is followed by |
21666f1a | 1182 | * a space. |
5180cacc | 1183 | */ |
21666f1a | 1184 | i = 0; |
5180cacc LT |
1185 | for (;;) { |
1186 | char c = *hdr++; | |
1187 | if (c == ' ') | |
1188 | break; | |
21666f1a NP |
1189 | type[i++] = c; |
1190 | if (i >= sizeof(type)) | |
5180cacc | 1191 | return -1; |
5180cacc | 1192 | } |
21666f1a | 1193 | type[i] = 0; |
5180cacc LT |
1194 | |
1195 | /* | |
1196 | * The length must follow immediately, and be in canonical | |
1197 | * decimal format (ie "010" is not valid). | |
1198 | */ | |
1199 | size = *hdr++ - '0'; | |
1200 | if (size > 9) | |
1201 | return -1; | |
1202 | if (size) { | |
1203 | for (;;) { | |
1204 | unsigned long c = *hdr - '0'; | |
1205 | if (c > 9) | |
1206 | break; | |
1207 | hdr++; | |
1208 | size = size * 10 + c; | |
1209 | } | |
1210 | } | |
1211 | *sizep = size; | |
1212 | ||
1213 | /* | |
1214 | * The length must be followed by a zero byte | |
1215 | */ | |
21666f1a | 1216 | return *hdr ? -1 : type_from_string(type); |
5180cacc LT |
1217 | } |
1218 | ||
7efbff75 | 1219 | static void *unpack_sha1_file(void *map, unsigned long mapsize, enum object_type *type, unsigned long *size, const unsigned char *sha1) |
0fcfd160 | 1220 | { |
5180cacc | 1221 | int ret; |
0fcfd160 | 1222 | z_stream stream; |
5180cacc | 1223 | char hdr[8192]; |
0fcfd160 | 1224 | |
5180cacc | 1225 | ret = unpack_sha1_header(&stream, map, mapsize, hdr, sizeof(hdr)); |
21666f1a | 1226 | if (ret < Z_OK || (*type = parse_sha1_header(hdr, size)) < 0) |
0fcfd160 LT |
1227 | return NULL; |
1228 | ||
7efbff75 | 1229 | return unpack_sha1_rest(&stream, hdr, *size, sha1); |
0fcfd160 LT |
1230 | } |
1231 | ||
54dab52a NP |
1232 | unsigned long get_size_from_delta(struct packed_git *p, |
1233 | struct pack_window **w_curs, | |
1234 | off_t curpos) | |
1235 | { | |
1236 | const unsigned char *data; | |
1237 | unsigned char delta_head[20], *in; | |
1238 | z_stream stream; | |
1239 | int st; | |
1240 | ||
1241 | memset(&stream, 0, sizeof(stream)); | |
1242 | stream.next_out = delta_head; | |
1243 | stream.avail_out = sizeof(delta_head); | |
1244 | ||
1245 | inflateInit(&stream); | |
1246 | do { | |
1247 | in = use_pack(p, w_curs, curpos, &stream.avail_in); | |
1248 | stream.next_in = in; | |
1249 | st = inflate(&stream, Z_FINISH); | |
1250 | curpos += stream.next_in - in; | |
1251 | } while ((st == Z_OK || st == Z_BUF_ERROR) && | |
1252 | stream.total_out < sizeof(delta_head)); | |
1253 | inflateEnd(&stream); | |
1254 | if ((st != Z_STREAM_END) && stream.total_out != sizeof(delta_head)) | |
1255 | die("delta data unpack-initial failed"); | |
1256 | ||
1257 | /* Examine the initial part of the delta to figure out | |
1258 | * the result size. | |
1259 | */ | |
1260 | data = delta_head; | |
1261 | ||
1262 | /* ignore base size */ | |
1263 | get_delta_hdr_size(&data, delta_head+sizeof(delta_head)); | |
1264 | ||
1265 | /* Read the result size */ | |
1266 | return get_delta_hdr_size(&data, delta_head+sizeof(delta_head)); | |
1267 | } | |
1268 | ||
c4001d92 | 1269 | static off_t get_delta_base(struct packed_git *p, |
03e79c88 | 1270 | struct pack_window **w_curs, |
c4001d92 | 1271 | off_t *curpos, |
21666f1a | 1272 | enum object_type type, |
c4001d92 | 1273 | off_t delta_obj_offset) |
eb32d236 | 1274 | { |
2b87c45b | 1275 | unsigned char *base_info = use_pack(p, w_curs, *curpos, NULL); |
c4001d92 | 1276 | off_t base_offset; |
eb32d236 | 1277 | |
8d8a4ea5 SP |
1278 | /* use_pack() assured us we have [base_info, base_info + 20) |
1279 | * as a range that we can look at without walking off the | |
1280 | * end of the mapped window. Its actually the hash size | |
1281 | * that is assured. An OFS_DELTA longer than the hash size | |
1282 | * is stupid, as then a REF_DELTA would be smaller to store. | |
1283 | */ | |
21666f1a | 1284 | if (type == OBJ_OFS_DELTA) { |
eb32d236 NP |
1285 | unsigned used = 0; |
1286 | unsigned char c = base_info[used++]; | |
1287 | base_offset = c & 127; | |
1288 | while (c & 128) { | |
1289 | base_offset += 1; | |
8723f216 | 1290 | if (!base_offset || MSB(base_offset, 7)) |
eb32d236 NP |
1291 | die("offset value overflow for delta base object"); |
1292 | c = base_info[used++]; | |
1293 | base_offset = (base_offset << 7) + (c & 127); | |
1294 | } | |
1295 | base_offset = delta_obj_offset - base_offset; | |
1296 | if (base_offset >= delta_obj_offset) | |
1297 | die("delta base offset out of bound"); | |
2b87c45b | 1298 | *curpos += used; |
21666f1a | 1299 | } else if (type == OBJ_REF_DELTA) { |
eb32d236 NP |
1300 | /* The base entry _must_ be in the same pack */ |
1301 | base_offset = find_pack_entry_one(base_info, p); | |
1302 | if (!base_offset) | |
1303 | die("failed to find delta-pack base object %s", | |
1304 | sha1_to_hex(base_info)); | |
2b87c45b | 1305 | *curpos += 20; |
eb32d236 NP |
1306 | } else |
1307 | die("I am totally screwed"); | |
2b87c45b | 1308 | return base_offset; |
eb32d236 NP |
1309 | } |
1310 | ||
f3bf9224 | 1311 | /* forward declaration for a mutually recursive function */ |
c4001d92 | 1312 | static int packed_object_info(struct packed_git *p, off_t offset, |
21666f1a | 1313 | unsigned long *sizep); |
f3bf9224 | 1314 | |
43057304 | 1315 | static int packed_delta_info(struct packed_git *p, |
03e79c88 | 1316 | struct pack_window **w_curs, |
c4001d92 | 1317 | off_t curpos, |
21666f1a | 1318 | enum object_type type, |
c4001d92 | 1319 | off_t obj_offset, |
43057304 | 1320 | unsigned long *sizep) |
5db47c2b | 1321 | { |
c4001d92 | 1322 | off_t base_offset; |
f3bf9224 | 1323 | |
21666f1a NP |
1324 | base_offset = get_delta_base(p, w_curs, &curpos, type, obj_offset); |
1325 | type = packed_object_info(p, base_offset, NULL); | |
f3bf9224 | 1326 | |
c62266f3 JH |
1327 | /* We choose to only get the type of the base object and |
1328 | * ignore potentially corrupt pack file that expects the delta | |
1329 | * based on a base with a wrong size. This saves tons of | |
1330 | * inflate() calls. | |
1331 | */ | |
54dab52a NP |
1332 | if (sizep) |
1333 | *sizep = get_size_from_delta(p, w_curs, curpos); | |
21666f1a NP |
1334 | |
1335 | return type; | |
5db47c2b JH |
1336 | } |
1337 | ||
2b87c45b NP |
1338 | static int unpack_object_header(struct packed_git *p, |
1339 | struct pack_window **w_curs, | |
c4001d92 | 1340 | off_t *curpos, |
2b87c45b | 1341 | unsigned long *sizep) |
a733cb60 | 1342 | { |
03e79c88 SP |
1343 | unsigned char *base; |
1344 | unsigned int left; | |
ad1ed5ee | 1345 | unsigned long used; |
2b87c45b | 1346 | enum object_type type; |
a733cb60 | 1347 | |
8d8a4ea5 SP |
1348 | /* use_pack() assures us we have [base, base + 20) available |
1349 | * as a range that we can look at at. (Its actually the hash | |
3dff5379 | 1350 | * size that is assured.) With our object header encoding |
8d8a4ea5 SP |
1351 | * the maximum deflated object size is 2^137, which is just |
1352 | * insane, so we know won't exceed what we have been given. | |
1353 | */ | |
2b87c45b NP |
1354 | base = use_pack(p, w_curs, *curpos, &left); |
1355 | used = unpack_object_header_gently(base, left, &type, sizep); | |
ad1ed5ee JH |
1356 | if (!used) |
1357 | die("object offset outside of pack file"); | |
2b87c45b | 1358 | *curpos += used; |
ad1ed5ee | 1359 | |
2b87c45b | 1360 | return type; |
a733cb60 LT |
1361 | } |
1362 | ||
21666f1a | 1363 | const char *packed_object_info_detail(struct packed_git *p, |
c4001d92 | 1364 | off_t obj_offset, |
21666f1a NP |
1365 | unsigned long *size, |
1366 | unsigned long *store_size, | |
1367 | unsigned int *delta_chain_length, | |
1368 | unsigned char *base_sha1) | |
ad8c80a5 | 1369 | { |
03e79c88 | 1370 | struct pack_window *w_curs = NULL; |
c4001d92 SP |
1371 | off_t curpos; |
1372 | unsigned long dummy; | |
43057304 | 1373 | unsigned char *next_sha1; |
21666f1a | 1374 | enum object_type type; |
70f5d5d3 | 1375 | struct revindex_entry *revidx; |
ad8c80a5 | 1376 | |
43057304 | 1377 | *delta_chain_length = 0; |
2b87c45b | 1378 | curpos = obj_offset; |
21666f1a | 1379 | type = unpack_object_header(p, &w_curs, &curpos, size); |
43057304 | 1380 | |
70f5d5d3 NP |
1381 | revidx = find_pack_revindex(p, obj_offset); |
1382 | *store_size = revidx[1].offset - obj_offset; | |
1383 | ||
43057304 | 1384 | for (;;) { |
21666f1a | 1385 | switch (type) { |
43057304 | 1386 | default: |
08a19d87 | 1387 | die("pack %s contains unknown object type %d", |
21666f1a | 1388 | p->pack_name, type); |
43057304 NP |
1389 | case OBJ_COMMIT: |
1390 | case OBJ_TREE: | |
1391 | case OBJ_BLOB: | |
1392 | case OBJ_TAG: | |
03e79c88 | 1393 | unuse_pack(&w_curs); |
21666f1a | 1394 | return typename(type); |
eb32d236 | 1395 | case OBJ_OFS_DELTA: |
21666f1a | 1396 | obj_offset = get_delta_base(p, &w_curs, &curpos, type, obj_offset); |
eb32d236 | 1397 | if (*delta_chain_length == 0) { |
70f5d5d3 NP |
1398 | revidx = find_pack_revindex(p, obj_offset); |
1399 | hashcpy(base_sha1, nth_packed_object_sha1(p, revidx->nr)); | |
eb32d236 NP |
1400 | } |
1401 | break; | |
1402 | case OBJ_REF_DELTA: | |
2b87c45b | 1403 | next_sha1 = use_pack(p, &w_curs, curpos, NULL); |
43057304 NP |
1404 | if (*delta_chain_length == 0) |
1405 | hashcpy(base_sha1, next_sha1); | |
2b87c45b | 1406 | obj_offset = find_pack_entry_one(next_sha1, p); |
43057304 NP |
1407 | break; |
1408 | } | |
43057304 | 1409 | (*delta_chain_length)++; |
2b87c45b | 1410 | curpos = obj_offset; |
21666f1a | 1411 | type = unpack_object_header(p, &w_curs, &curpos, &dummy); |
ad8c80a5 | 1412 | } |
ad8c80a5 JH |
1413 | } |
1414 | ||
c4001d92 | 1415 | static int packed_object_info(struct packed_git *p, off_t obj_offset, |
21666f1a | 1416 | unsigned long *sizep) |
1f688557 | 1417 | { |
03e79c88 | 1418 | struct pack_window *w_curs = NULL; |
c4001d92 SP |
1419 | unsigned long size; |
1420 | off_t curpos = obj_offset; | |
21666f1a | 1421 | enum object_type type; |
5db47c2b | 1422 | |
21666f1a | 1423 | type = unpack_object_header(p, &w_curs, &curpos, &size); |
5db47c2b | 1424 | |
21666f1a | 1425 | switch (type) { |
eb32d236 NP |
1426 | case OBJ_OFS_DELTA: |
1427 | case OBJ_REF_DELTA: | |
21666f1a NP |
1428 | type = packed_delta_info(p, &w_curs, curpos, |
1429 | type, obj_offset, sizep); | |
2b87c45b | 1430 | break; |
a733cb60 | 1431 | case OBJ_COMMIT: |
a733cb60 | 1432 | case OBJ_TREE: |
a733cb60 | 1433 | case OBJ_BLOB: |
a733cb60 | 1434 | case OBJ_TAG: |
2b87c45b NP |
1435 | if (sizep) |
1436 | *sizep = size; | |
a69d0943 | 1437 | break; |
1f688557 | 1438 | default: |
08a19d87 | 1439 | die("pack %s contains unknown object type %d", |
21666f1a | 1440 | p->pack_name, type); |
1f688557 | 1441 | } |
2b87c45b | 1442 | unuse_pack(&w_curs); |
21666f1a | 1443 | return type; |
1f688557 JH |
1444 | } |
1445 | ||
eb950c19 | 1446 | static void *unpack_compressed_entry(struct packed_git *p, |
03e79c88 | 1447 | struct pack_window **w_curs, |
c4001d92 | 1448 | off_t curpos, |
eb950c19 | 1449 | unsigned long size) |
de530aaa SP |
1450 | { |
1451 | int st; | |
1452 | z_stream stream; | |
079afb18 | 1453 | unsigned char *buffer, *in; |
de530aaa SP |
1454 | |
1455 | buffer = xmalloc(size + 1); | |
1456 | buffer[size] = 0; | |
1457 | memset(&stream, 0, sizeof(stream)); | |
de530aaa SP |
1458 | stream.next_out = buffer; |
1459 | stream.avail_out = size; | |
1460 | ||
1461 | inflateInit(&stream); | |
079afb18 | 1462 | do { |
2b87c45b | 1463 | in = use_pack(p, w_curs, curpos, &stream.avail_in); |
079afb18 SP |
1464 | stream.next_in = in; |
1465 | st = inflate(&stream, Z_FINISH); | |
2b87c45b | 1466 | curpos += stream.next_in - in; |
079afb18 | 1467 | } while (st == Z_OK || st == Z_BUF_ERROR); |
de530aaa SP |
1468 | inflateEnd(&stream); |
1469 | if ((st != Z_STREAM_END) || stream.total_out != size) { | |
1470 | free(buffer); | |
1471 | return NULL; | |
1472 | } | |
1473 | ||
1474 | return buffer; | |
1475 | } | |
1476 | ||
e5e01619 LT |
1477 | #define MAX_DELTA_CACHE (256) |
1478 | ||
18bdec11 | 1479 | static size_t delta_base_cached; |
5e08ecbf NP |
1480 | |
1481 | static struct delta_base_cache_lru_list { | |
1482 | struct delta_base_cache_lru_list *prev; | |
1483 | struct delta_base_cache_lru_list *next; | |
1484 | } delta_base_cache_lru = { &delta_base_cache_lru, &delta_base_cache_lru }; | |
1485 | ||
e5e01619 | 1486 | static struct delta_base_cache_entry { |
5e08ecbf NP |
1487 | struct delta_base_cache_lru_list lru; |
1488 | void *data; | |
e5e01619 LT |
1489 | struct packed_git *p; |
1490 | off_t base_offset; | |
1491 | unsigned long size; | |
e5e01619 LT |
1492 | enum object_type type; |
1493 | } delta_base_cache[MAX_DELTA_CACHE]; | |
1494 | ||
1495 | static unsigned long pack_entry_hash(struct packed_git *p, off_t base_offset) | |
1496 | { | |
1497 | unsigned long hash; | |
1498 | ||
1499 | hash = (unsigned long)p + (unsigned long)base_offset; | |
1500 | hash += (hash >> 8) + (hash >> 16); | |
3358004a | 1501 | return hash % MAX_DELTA_CACHE; |
e5e01619 LT |
1502 | } |
1503 | ||
62f255ad | 1504 | static void *cache_or_unpack_entry(struct packed_git *p, off_t base_offset, |
a0cba108 | 1505 | unsigned long *base_size, enum object_type *type, int keep_cache) |
62f255ad | 1506 | { |
e5e01619 LT |
1507 | void *ret; |
1508 | unsigned long hash = pack_entry_hash(p, base_offset); | |
1509 | struct delta_base_cache_entry *ent = delta_base_cache + hash; | |
1510 | ||
1511 | ret = ent->data; | |
1512 | if (ret && ent->p == p && ent->base_offset == base_offset) | |
1513 | goto found_cache_entry; | |
62f255ad | 1514 | return unpack_entry(p, base_offset, type, base_size); |
e5e01619 LT |
1515 | |
1516 | found_cache_entry: | |
18bdec11 | 1517 | if (!keep_cache) { |
a0cba108 | 1518 | ent->data = NULL; |
5e08ecbf NP |
1519 | ent->lru.next->prev = ent->lru.prev; |
1520 | ent->lru.prev->next = ent->lru.next; | |
18bdec11 | 1521 | delta_base_cached -= ent->size; |
182af834 PH |
1522 | } else { |
1523 | ret = xmemdupz(ent->data, ent->size); | |
a0cba108 | 1524 | } |
e5e01619 LT |
1525 | *type = ent->type; |
1526 | *base_size = ent->size; | |
1527 | return ret; | |
62f255ad LT |
1528 | } |
1529 | ||
18bdec11 SP |
1530 | static inline void release_delta_base_cache(struct delta_base_cache_entry *ent) |
1531 | { | |
1532 | if (ent->data) { | |
1533 | free(ent->data); | |
1534 | ent->data = NULL; | |
5e08ecbf NP |
1535 | ent->lru.next->prev = ent->lru.prev; |
1536 | ent->lru.prev->next = ent->lru.next; | |
18bdec11 SP |
1537 | delta_base_cached -= ent->size; |
1538 | } | |
1539 | } | |
1540 | ||
62f255ad LT |
1541 | static void add_delta_base_cache(struct packed_git *p, off_t base_offset, |
1542 | void *base, unsigned long base_size, enum object_type type) | |
1543 | { | |
5e08ecbf | 1544 | unsigned long hash = pack_entry_hash(p, base_offset); |
e5e01619 | 1545 | struct delta_base_cache_entry *ent = delta_base_cache + hash; |
5e08ecbf | 1546 | struct delta_base_cache_lru_list *lru; |
e5e01619 | 1547 | |
18bdec11 SP |
1548 | release_delta_base_cache(ent); |
1549 | delta_base_cached += base_size; | |
5e08ecbf NP |
1550 | |
1551 | for (lru = delta_base_cache_lru.next; | |
1552 | delta_base_cached > delta_base_cache_limit | |
1553 | && lru != &delta_base_cache_lru; | |
1554 | lru = lru->next) { | |
1555 | struct delta_base_cache_entry *f = (void *)lru; | |
18bdec11 SP |
1556 | if (f->type == OBJ_BLOB) |
1557 | release_delta_base_cache(f); | |
1558 | } | |
5e08ecbf NP |
1559 | for (lru = delta_base_cache_lru.next; |
1560 | delta_base_cached > delta_base_cache_limit | |
1561 | && lru != &delta_base_cache_lru; | |
1562 | lru = lru->next) { | |
1563 | struct delta_base_cache_entry *f = (void *)lru; | |
1564 | release_delta_base_cache(f); | |
1565 | } | |
18bdec11 | 1566 | |
e5e01619 LT |
1567 | ent->p = p; |
1568 | ent->base_offset = base_offset; | |
1569 | ent->type = type; | |
1570 | ent->data = base; | |
1571 | ent->size = base_size; | |
5e08ecbf NP |
1572 | ent->lru.next = &delta_base_cache_lru; |
1573 | ent->lru.prev = delta_base_cache_lru.prev; | |
1574 | delta_base_cache_lru.prev->next = &ent->lru; | |
1575 | delta_base_cache_lru.prev = &ent->lru; | |
62f255ad LT |
1576 | } |
1577 | ||
eb950c19 | 1578 | static void *unpack_delta_entry(struct packed_git *p, |
03e79c88 | 1579 | struct pack_window **w_curs, |
c4001d92 | 1580 | off_t curpos, |
1f688557 | 1581 | unsigned long delta_size, |
c4001d92 | 1582 | off_t obj_offset, |
21666f1a | 1583 | enum object_type *type, |
eb950c19 | 1584 | unsigned long *sizep) |
1f688557 | 1585 | { |
7c3e8be3 | 1586 | void *delta_data, *result, *base; |
c4001d92 SP |
1587 | unsigned long base_size; |
1588 | off_t base_offset; | |
43057304 | 1589 | |
21666f1a | 1590 | base_offset = get_delta_base(p, w_curs, &curpos, *type, obj_offset); |
a0cba108 | 1591 | base = cache_or_unpack_entry(p, base_offset, &base_size, type, 0); |
67686d95 | 1592 | if (!base) |
c4001d92 SP |
1593 | die("failed to read delta base object" |
1594 | " at %"PRIuMAX" from %s", | |
1595 | (uintmax_t)base_offset, p->pack_name); | |
67686d95 | 1596 | |
2b87c45b | 1597 | delta_data = unpack_compressed_entry(p, w_curs, curpos, delta_size); |
9064d87b SP |
1598 | if (!delta_data) |
1599 | die("failed to unpack compressed delta" | |
1600 | " at %"PRIuMAX" from %s", | |
1601 | (uintmax_t)curpos, p->pack_name); | |
1f688557 JH |
1602 | result = patch_delta(base, base_size, |
1603 | delta_data, delta_size, | |
21666f1a | 1604 | sizep); |
1f688557 JH |
1605 | if (!result) |
1606 | die("failed to apply delta"); | |
1607 | free(delta_data); | |
62f255ad | 1608 | add_delta_base_cache(p, base_offset, base, base_size, *type); |
1f688557 JH |
1609 | return result; |
1610 | } | |
1611 | ||
c4001d92 | 1612 | void *unpack_entry(struct packed_git *p, off_t obj_offset, |
21666f1a | 1613 | enum object_type *type, unsigned long *sizep) |
1f688557 | 1614 | { |
03e79c88 | 1615 | struct pack_window *w_curs = NULL; |
c4001d92 | 1616 | off_t curpos = obj_offset; |
21666f1a | 1617 | void *data; |
1f688557 | 1618 | |
21666f1a NP |
1619 | *type = unpack_object_header(p, &w_curs, &curpos, sizep); |
1620 | switch (*type) { | |
eb32d236 NP |
1621 | case OBJ_OFS_DELTA: |
1622 | case OBJ_REF_DELTA: | |
21666f1a NP |
1623 | data = unpack_delta_entry(p, &w_curs, curpos, *sizep, |
1624 | obj_offset, type, sizep); | |
4d703a1a | 1625 | break; |
a733cb60 | 1626 | case OBJ_COMMIT: |
a733cb60 | 1627 | case OBJ_TREE: |
a733cb60 | 1628 | case OBJ_BLOB: |
a733cb60 | 1629 | case OBJ_TAG: |
21666f1a | 1630 | data = unpack_compressed_entry(p, &w_curs, curpos, *sizep); |
4d703a1a | 1631 | break; |
1f688557 | 1632 | default: |
21666f1a | 1633 | die("unknown object type %i in %s", *type, p->pack_name); |
1f688557 | 1634 | } |
03e79c88 | 1635 | unuse_pack(&w_curs); |
21666f1a | 1636 | return data; |
1f688557 JH |
1637 | } |
1638 | ||
d079837e | 1639 | const unsigned char *nth_packed_object_sha1(struct packed_git *p, |
d72308e0 | 1640 | uint32_t n) |
9a217f2a | 1641 | { |
42873078 | 1642 | const unsigned char *index = p->index_data; |
d079837e SP |
1643 | if (!index) { |
1644 | if (open_pack_index(p)) | |
1645 | return NULL; | |
1646 | index = p->index_data; | |
1647 | } | |
57059091 | 1648 | if (n >= p->num_objects) |
d72308e0 | 1649 | return NULL; |
74e34e1f NP |
1650 | index += 4 * 256; |
1651 | if (p->index_version == 1) { | |
1652 | return index + 24 * n + 4; | |
1653 | } else { | |
1654 | index += 8; | |
1655 | return index + 20 * n; | |
1656 | } | |
1657 | } | |
1658 | ||
1659 | static off_t nth_packed_object_offset(const struct packed_git *p, uint32_t n) | |
1660 | { | |
1661 | const unsigned char *index = p->index_data; | |
1662 | index += 4 * 256; | |
1663 | if (p->index_version == 1) { | |
1664 | return ntohl(*((uint32_t *)(index + 24 * n))); | |
1665 | } else { | |
1666 | uint32_t off; | |
1667 | index += 8 + p->num_objects * (20 + 4); | |
1668 | off = ntohl(*((uint32_t *)(index + 4 * n))); | |
1669 | if (!(off & 0x80000000)) | |
1670 | return off; | |
1671 | index += p->num_objects * 4 + (off & 0x7fffffff) * 8; | |
1672 | return (((uint64_t)ntohl(*((uint32_t *)(index + 0)))) << 32) | | |
1673 | ntohl(*((uint32_t *)(index + 4))); | |
1674 | } | |
9a217f2a JH |
1675 | } |
1676 | ||
c4001d92 | 1677 | off_t find_pack_entry_one(const unsigned char *sha1, |
43057304 | 1678 | struct packed_git *p) |
1f688557 | 1679 | { |
42873078 | 1680 | const uint32_t *level1_ofs = p->index_data; |
42873078 | 1681 | const unsigned char *index = p->index_data; |
628522ec JH |
1682 | unsigned hi, lo, stride; |
1683 | static int use_lookup = -1; | |
1684 | static int debug_lookup = -1; | |
1685 | ||
1686 | if (debug_lookup < 0) | |
1687 | debug_lookup = !!getenv("GIT_DEBUG_LOOKUP"); | |
42873078 | 1688 | |
d079837e SP |
1689 | if (!index) { |
1690 | if (open_pack_index(p)) | |
1691 | return 0; | |
1692 | level1_ofs = p->index_data; | |
1693 | index = p->index_data; | |
1694 | } | |
74e34e1f NP |
1695 | if (p->index_version > 1) { |
1696 | level1_ofs += 2; | |
1697 | index += 8; | |
1698 | } | |
42873078 | 1699 | index += 4 * 256; |
74e34e1f NP |
1700 | hi = ntohl(level1_ofs[*sha1]); |
1701 | lo = ((*sha1 == 0x0) ? 0 : ntohl(level1_ofs[*sha1 - 1])); | |
628522ec JH |
1702 | if (p->index_version > 1) { |
1703 | stride = 20; | |
1704 | } else { | |
1705 | stride = 24; | |
1706 | index += 4; | |
1707 | } | |
1708 | ||
1709 | if (debug_lookup) | |
1710 | printf("%02x%02x%02x... lo %u hi %u nr %u\n", | |
1711 | sha1[0], sha1[1], sha1[2], lo, hi, p->num_objects); | |
1712 | ||
1713 | if (use_lookup < 0) | |
1714 | use_lookup = !!getenv("GIT_USE_LOOKUP"); | |
1715 | if (use_lookup) { | |
1716 | int pos = sha1_entry_pos(index, stride, 0, | |
1717 | lo, hi, p->num_objects, sha1); | |
1718 | if (pos < 0) | |
1719 | return 0; | |
1720 | return nth_packed_object_offset(p, pos); | |
1721 | } | |
1f688557 JH |
1722 | |
1723 | do { | |
74e34e1f | 1724 | unsigned mi = (lo + hi) / 2; |
628522ec JH |
1725 | int cmp = hashcmp(index + mi * stride, sha1); |
1726 | ||
1727 | if (debug_lookup) | |
1728 | printf("lo %u hi %u rg %u mi %u\n", | |
1729 | lo, hi, hi - lo, mi); | |
43057304 | 1730 | if (!cmp) |
74e34e1f | 1731 | return nth_packed_object_offset(p, mi); |
1f688557 JH |
1732 | if (cmp > 0) |
1733 | hi = mi; | |
1734 | else | |
1735 | lo = mi+1; | |
1736 | } while (lo < hi); | |
1737 | return 0; | |
1738 | } | |
1739 | ||
000dfd3f | 1740 | int matches_pack_name(struct packed_git *p, const char *name) |
d4ff6d92 SP |
1741 | { |
1742 | const char *last_c, *c; | |
1743 | ||
000dfd3f JH |
1744 | if (!strcmp(p->pack_name, name)) |
1745 | return 1; | |
d4ff6d92 SP |
1746 | |
1747 | for (c = p->pack_name, last_c = c; *c;) | |
1748 | if (*c == '/') | |
1749 | last_c = ++c; | |
1750 | else | |
1751 | ++c; | |
000dfd3f JH |
1752 | if (!strcmp(last_c, name)) |
1753 | return 1; | |
d4ff6d92 | 1754 | |
000dfd3f | 1755 | return 0; |
d4ff6d92 SP |
1756 | } |
1757 | ||
106d710b | 1758 | static int find_pack_entry(const unsigned char *sha1, struct pack_entry *e, const char **ignore_packed) |
1f688557 | 1759 | { |
f7c22cc6 | 1760 | static struct packed_git *last_found = (void *)1; |
1f688557 | 1761 | struct packed_git *p; |
c4001d92 | 1762 | off_t offset; |
43057304 | 1763 | |
1f688557 | 1764 | prepare_packed_git(); |
f7c22cc6 NP |
1765 | if (!packed_git) |
1766 | return 0; | |
1767 | p = (last_found == (void *)1) ? packed_git : last_found; | |
1f688557 | 1768 | |
f7c22cc6 | 1769 | do { |
106d710b JH |
1770 | if (ignore_packed) { |
1771 | const char **ig; | |
1772 | for (ig = ignore_packed; *ig; ig++) | |
000dfd3f | 1773 | if (matches_pack_name(p, *ig)) |
106d710b JH |
1774 | break; |
1775 | if (*ig) | |
f7c22cc6 | 1776 | goto next; |
106d710b | 1777 | } |
f7c22cc6 | 1778 | |
43057304 NP |
1779 | offset = find_pack_entry_one(sha1, p); |
1780 | if (offset) { | |
c715f783 SP |
1781 | /* |
1782 | * We are about to tell the caller where they can | |
1783 | * locate the requested object. We better make | |
1784 | * sure the packfile is still here and can be | |
1785 | * accessed before supplying that answer, as | |
1786 | * it may have been deleted since the index | |
1787 | * was loaded! | |
1788 | */ | |
1789 | if (p->pack_fd == -1 && open_packed_git(p)) { | |
1790 | error("packfile %s cannot be accessed", p->pack_name); | |
f7c22cc6 | 1791 | goto next; |
c715f783 | 1792 | } |
43057304 NP |
1793 | e->offset = offset; |
1794 | e->p = p; | |
1795 | hashcpy(e->sha1, sha1); | |
f7c22cc6 | 1796 | last_found = p; |
1f688557 | 1797 | return 1; |
43057304 | 1798 | } |
f7c22cc6 NP |
1799 | |
1800 | next: | |
1801 | if (p == last_found) | |
1802 | p = packed_git; | |
1803 | else | |
1804 | p = p->next; | |
1805 | if (p == last_found) | |
1806 | p = p->next; | |
1807 | } while (p); | |
1f688557 JH |
1808 | return 0; |
1809 | } | |
1810 | ||
a6080a0a | 1811 | struct packed_git *find_sha1_pack(const unsigned char *sha1, |
bf592c50 DB |
1812 | struct packed_git *packs) |
1813 | { | |
1814 | struct packed_git *p; | |
bf592c50 DB |
1815 | |
1816 | for (p = packs; p; p = p->next) { | |
43057304 | 1817 | if (find_pack_entry_one(sha1, p)) |
bf592c50 DB |
1818 | return p; |
1819 | } | |
1820 | return NULL; | |
21666f1a | 1821 | |
bf592c50 DB |
1822 | } |
1823 | ||
21666f1a | 1824 | static int sha1_loose_object_info(const unsigned char *sha1, unsigned long *sizep) |
65c2e0c3 | 1825 | { |
36e4d74a | 1826 | int status; |
65c2e0c3 JH |
1827 | unsigned long mapsize, size; |
1828 | void *map; | |
1829 | z_stream stream; | |
d65a16f6 | 1830 | char hdr[32]; |
65c2e0c3 | 1831 | |
bb6b8e4f | 1832 | map = map_sha1_file(sha1, &mapsize); |
f0df4ed5 JS |
1833 | if (!map) |
1834 | return error("unable to find %s", sha1_to_hex(sha1)); | |
36e4d74a JH |
1835 | if (unpack_sha1_header(&stream, map, mapsize, hdr, sizeof(hdr)) < 0) |
1836 | status = error("unable to unpack %s header", | |
1837 | sha1_to_hex(sha1)); | |
21666f1a | 1838 | else if ((status = parse_sha1_header(hdr, &size)) < 0) |
36e4d74a | 1839 | status = error("unable to parse %s header", sha1_to_hex(sha1)); |
21666f1a NP |
1840 | else if (sizep) |
1841 | *sizep = size; | |
65c2e0c3 JH |
1842 | inflateEnd(&stream); |
1843 | munmap(map, mapsize); | |
1844 | return status; | |
1845 | } | |
1846 | ||
21666f1a | 1847 | int sha1_object_info(const unsigned char *sha1, unsigned long *sizep) |
f0df4ed5 | 1848 | { |
f0df4ed5 JS |
1849 | struct pack_entry e; |
1850 | ||
1851 | if (!find_pack_entry(sha1, &e, NULL)) { | |
1852 | reprepare_packed_git(); | |
1853 | if (!find_pack_entry(sha1, &e, NULL)) | |
21666f1a | 1854 | return sha1_loose_object_info(sha1, sizep); |
f0df4ed5 | 1855 | } |
21666f1a | 1856 | return packed_object_info(e.p, e.offset, sizep); |
f0df4ed5 JS |
1857 | } |
1858 | ||
21666f1a NP |
1859 | static void *read_packed_sha1(const unsigned char *sha1, |
1860 | enum object_type *type, unsigned long *size) | |
1f688557 JH |
1861 | { |
1862 | struct pack_entry e; | |
1863 | ||
8276c007 | 1864 | if (!find_pack_entry(sha1, &e, NULL)) |
1f688557 | 1865 | return NULL; |
8276c007 | 1866 | else |
a0cba108 | 1867 | return cache_or_unpack_entry(e.p, e.offset, size, type, 1); |
1f688557 JH |
1868 | } |
1869 | ||
d66b37bb JH |
1870 | /* |
1871 | * This is meant to hold a *small* number of objects that you would | |
1872 | * want read_sha1_file() to be able to return, but yet you do not want | |
1873 | * to write them into the object store (e.g. a browse-only | |
1874 | * application). | |
1875 | */ | |
1876 | static struct cached_object { | |
1877 | unsigned char sha1[20]; | |
21666f1a | 1878 | enum object_type type; |
d66b37bb JH |
1879 | void *buf; |
1880 | unsigned long size; | |
1881 | } *cached_objects; | |
1882 | static int cached_object_nr, cached_object_alloc; | |
1883 | ||
346245a1 JK |
1884 | static struct cached_object empty_tree = { |
1885 | /* empty tree sha1: 4b825dc642cb6eb9a060e54bf8d69288fbee4904 */ | |
1886 | "\x4b\x82\x5d\xc6\x42\xcb\x6e\xb9\xa0\x60" | |
1887 | "\xe5\x4b\xf8\xd6\x92\x88\xfb\xee\x49\x04", | |
1888 | OBJ_TREE, | |
1889 | "", | |
1890 | 0 | |
1891 | }; | |
1892 | ||
d66b37bb JH |
1893 | static struct cached_object *find_cached_object(const unsigned char *sha1) |
1894 | { | |
1895 | int i; | |
1896 | struct cached_object *co = cached_objects; | |
1897 | ||
1898 | for (i = 0; i < cached_object_nr; i++, co++) { | |
1899 | if (!hashcmp(co->sha1, sha1)) | |
1900 | return co; | |
1901 | } | |
346245a1 JK |
1902 | if (!hashcmp(sha1, empty_tree.sha1)) |
1903 | return &empty_tree; | |
d66b37bb JH |
1904 | return NULL; |
1905 | } | |
1906 | ||
21666f1a NP |
1907 | int pretend_sha1_file(void *buf, unsigned long len, enum object_type type, |
1908 | unsigned char *sha1) | |
d66b37bb JH |
1909 | { |
1910 | struct cached_object *co; | |
1911 | ||
21666f1a | 1912 | hash_sha1_file(buf, len, typename(type), sha1); |
d66b37bb JH |
1913 | if (has_sha1_file(sha1) || find_cached_object(sha1)) |
1914 | return 0; | |
1915 | if (cached_object_alloc <= cached_object_nr) { | |
1916 | cached_object_alloc = alloc_nr(cached_object_alloc); | |
1917 | cached_objects = xrealloc(cached_objects, | |
1918 | sizeof(*cached_objects) * | |
1919 | cached_object_alloc); | |
1920 | } | |
1921 | co = &cached_objects[cached_object_nr++]; | |
1922 | co->size = len; | |
21666f1a | 1923 | co->type = type; |
efa13f7b JH |
1924 | co->buf = xmalloc(len); |
1925 | memcpy(co->buf, buf, len); | |
d66b37bb JH |
1926 | hashcpy(co->sha1, sha1); |
1927 | return 0; | |
1928 | } | |
1929 | ||
21666f1a NP |
1930 | void *read_sha1_file(const unsigned char *sha1, enum object_type *type, |
1931 | unsigned long *size) | |
0fcfd160 LT |
1932 | { |
1933 | unsigned long mapsize; | |
1934 | void *map, *buf; | |
d66b37bb JH |
1935 | struct cached_object *co; |
1936 | ||
1937 | co = find_cached_object(sha1); | |
1938 | if (co) { | |
21666f1a | 1939 | *type = co->type; |
d66b37bb | 1940 | *size = co->size; |
182af834 | 1941 | return xmemdupz(co->buf, co->size); |
d66b37bb | 1942 | } |
0fcfd160 | 1943 | |
8276c007 PE |
1944 | buf = read_packed_sha1(sha1, type, size); |
1945 | if (buf) | |
1946 | return buf; | |
bb6b8e4f | 1947 | map = map_sha1_file(sha1, &mapsize); |
0fcfd160 | 1948 | if (map) { |
7efbff75 | 1949 | buf = unpack_sha1_file(map, mapsize, type, size, sha1); |
0fcfd160 LT |
1950 | munmap(map, mapsize); |
1951 | return buf; | |
1952 | } | |
637cdd9d | 1953 | reprepare_packed_git(); |
8276c007 | 1954 | return read_packed_sha1(sha1, type, size); |
0fcfd160 LT |
1955 | } |
1956 | ||
40469ee9 | 1957 | void *read_object_with_reference(const unsigned char *sha1, |
21666f1a | 1958 | const char *required_type_name, |
40469ee9 JH |
1959 | unsigned long *size, |
1960 | unsigned char *actual_sha1_return) | |
f4913f91 | 1961 | { |
21666f1a | 1962 | enum object_type type, required_type; |
f4913f91 JH |
1963 | void *buffer; |
1964 | unsigned long isize; | |
40469ee9 | 1965 | unsigned char actual_sha1[20]; |
f4913f91 | 1966 | |
21666f1a | 1967 | required_type = type_from_string(required_type_name); |
e702496e | 1968 | hashcpy(actual_sha1, sha1); |
40469ee9 JH |
1969 | while (1) { |
1970 | int ref_length = -1; | |
1971 | const char *ref_type = NULL; | |
f4913f91 | 1972 | |
21666f1a | 1973 | buffer = read_sha1_file(actual_sha1, &type, &isize); |
40469ee9 JH |
1974 | if (!buffer) |
1975 | return NULL; | |
21666f1a | 1976 | if (type == required_type) { |
40469ee9 JH |
1977 | *size = isize; |
1978 | if (actual_sha1_return) | |
e702496e | 1979 | hashcpy(actual_sha1_return, actual_sha1); |
40469ee9 JH |
1980 | return buffer; |
1981 | } | |
1982 | /* Handle references */ | |
21666f1a | 1983 | else if (type == OBJ_COMMIT) |
40469ee9 | 1984 | ref_type = "tree "; |
21666f1a | 1985 | else if (type == OBJ_TAG) |
40469ee9 JH |
1986 | ref_type = "object "; |
1987 | else { | |
1988 | free(buffer); | |
1989 | return NULL; | |
1990 | } | |
1991 | ref_length = strlen(ref_type); | |
f4913f91 | 1992 | |
50974ec9 MK |
1993 | if (ref_length + 40 > isize || |
1994 | memcmp(buffer, ref_type, ref_length) || | |
1d7f171c | 1995 | get_sha1_hex((char *) buffer + ref_length, actual_sha1)) { |
40469ee9 JH |
1996 | free(buffer); |
1997 | return NULL; | |
1998 | } | |
1cf58e72 | 1999 | free(buffer); |
40469ee9 JH |
2000 | /* Now we have the ID of the referred-to object in |
2001 | * actual_sha1. Check again. */ | |
f4913f91 | 2002 | } |
f4913f91 JH |
2003 | } |
2004 | ||
ce9fbf16 | 2005 | static void write_sha1_file_prepare(const void *buf, unsigned long len, |
972a9155 | 2006 | const char *type, unsigned char *sha1, |
d65a16f6 | 2007 | char *hdr, int *hdrlen) |
d410c0f5 JH |
2008 | { |
2009 | SHA_CTX c; | |
2010 | ||
2011 | /* Generate the header */ | |
d65a16f6 | 2012 | *hdrlen = sprintf(hdr, "%s %lu", type, len)+1; |
d410c0f5 JH |
2013 | |
2014 | /* Sha1.. */ | |
2015 | SHA1_Init(&c); | |
2016 | SHA1_Update(&c, hdr, *hdrlen); | |
2017 | SHA1_Update(&c, buf, len); | |
2018 | SHA1_Final(sha1, &c); | |
d410c0f5 JH |
2019 | } |
2020 | ||
230f1322 LT |
2021 | /* |
2022 | * Link the tempfile to the final place, possibly creating the | |
2023 | * last directory level as you do so. | |
2024 | * | |
2025 | * Returns the errno on failure, 0 on success. | |
2026 | */ | |
839837b9 | 2027 | static int link_temp_to_file(const char *tmpfile, const char *filename) |
230f1322 LT |
2028 | { |
2029 | int ret; | |
756aaf4a | 2030 | char *dir; |
230f1322 LT |
2031 | |
2032 | if (!link(tmpfile, filename)) | |
2033 | return 0; | |
2034 | ||
2035 | /* | |
756aaf4a | 2036 | * Try to mkdir the last path component if that failed. |
230f1322 LT |
2037 | * |
2038 | * Re-try the "link()" regardless of whether the mkdir | |
2039 | * succeeds, since a race might mean that somebody | |
2040 | * else succeeded. | |
2041 | */ | |
2042 | ret = errno; | |
756aaf4a SP |
2043 | dir = strrchr(filename, '/'); |
2044 | if (dir) { | |
2045 | *dir = 0; | |
866cae0d | 2046 | if (!mkdir(filename, 0777) && adjust_shared_perm(filename)) { |
91c23e48 | 2047 | *dir = '/'; |
756aaf4a | 2048 | return -2; |
91c23e48 | 2049 | } |
756aaf4a SP |
2050 | *dir = '/'; |
2051 | if (!link(tmpfile, filename)) | |
2052 | return 0; | |
2053 | ret = errno; | |
230f1322 LT |
2054 | } |
2055 | return ret; | |
2056 | } | |
2057 | ||
2058 | /* | |
2059 | * Move the just written object into its final resting place | |
2060 | */ | |
839837b9 | 2061 | int move_temp_to_file(const char *tmpfile, const char *filename) |
230f1322 LT |
2062 | { |
2063 | int ret = link_temp_to_file(tmpfile, filename); | |
7ebb6fca LT |
2064 | |
2065 | /* | |
2066 | * Coda hack - coda doesn't like cross-directory links, | |
2067 | * so we fall back to a rename, which will mean that it | |
2068 | * won't be able to check collisions, but that's not a | |
2069 | * big deal. | |
2070 | * | |
2071 | * The same holds for FAT formatted media. | |
2072 | * | |
2073 | * When this succeeds, we just return 0. We have nothing | |
2074 | * left to unlink. | |
2075 | */ | |
2076 | if (ret && ret != EEXIST) { | |
2077 | if (!rename(tmpfile, filename)) | |
230f1322 | 2078 | return 0; |
9e48b389 | 2079 | ret = errno; |
230f1322 LT |
2080 | } |
2081 | unlink(tmpfile); | |
2082 | if (ret) { | |
2083 | if (ret != EEXIST) { | |
916d081b | 2084 | return error("unable to write sha1 filename %s: %s\n", filename, strerror(ret)); |
230f1322 LT |
2085 | } |
2086 | /* FIXME!!! Collision check here ? */ | |
2087 | } | |
2088 | ||
2089 | return 0; | |
2090 | } | |
2091 | ||
4d548150 LT |
2092 | static int write_buffer(int fd, const void *buf, size_t len) |
2093 | { | |
d34cf19b | 2094 | if (write_in_full(fd, buf, len) < 0) |
93822c22 | 2095 | return error("file write error (%s)", strerror(errno)); |
4d548150 LT |
2096 | return 0; |
2097 | } | |
2098 | ||
ce9fbf16 | 2099 | int hash_sha1_file(const void *buf, unsigned long len, const char *type, |
abdc3fc8 RS |
2100 | unsigned char *sha1) |
2101 | { | |
d65a16f6 | 2102 | char hdr[32]; |
abdc3fc8 RS |
2103 | int hdrlen; |
2104 | write_sha1_file_prepare(buf, len, type, sha1, hdr, &hdrlen); | |
2105 | return 0; | |
2106 | } | |
2107 | ||
bbac7311 NP |
2108 | static int write_loose_object(const unsigned char *sha1, char *hdr, int hdrlen, |
2109 | void *buf, unsigned long len, time_t mtime) | |
0fcfd160 | 2110 | { |
bbac7311 | 2111 | int fd, size, ret; |
bf0f910d | 2112 | unsigned char *compressed; |
0fcfd160 | 2113 | z_stream stream; |
706bc531 | 2114 | char *filename; |
aac17941 | 2115 | static char tmpfile[PATH_MAX]; |
a44c9a5e | 2116 | |
972a9155 | 2117 | filename = sha1_file_name(sha1); |
aac17941 LT |
2118 | fd = open(filename, O_RDONLY); |
2119 | if (fd >= 0) { | |
706bc531 | 2120 | /* |
aac17941 LT |
2121 | * FIXME!!! We might do collision checking here, but we'd |
2122 | * need to uncompress the old file and check it. Later. | |
706bc531 | 2123 | */ |
aac17941 | 2124 | close(fd); |
706bc531 LT |
2125 | return 0; |
2126 | } | |
2127 | ||
aac17941 | 2128 | if (errno != ENOENT) { |
916d081b | 2129 | return error("sha1 file %s: %s\n", filename, strerror(errno)); |
aac17941 LT |
2130 | } |
2131 | ||
0e55181f | 2132 | snprintf(tmpfile, sizeof(tmpfile), "%s/tmp_obj_XXXXXX", get_object_directory()); |
ace1534d | 2133 | |
aac17941 LT |
2134 | fd = mkstemp(tmpfile); |
2135 | if (fd < 0) { | |
916d081b PB |
2136 | if (errno == EPERM) |
2137 | return error("insufficient permission for adding an object to repository database %s\n", get_object_directory()); | |
2138 | else | |
2139 | return error("unable to create temporary sha1 filename %s: %s\n", tmpfile, strerror(errno)); | |
aac17941 LT |
2140 | } |
2141 | ||
0fcfd160 LT |
2142 | /* Set it up */ |
2143 | memset(&stream, 0, sizeof(stream)); | |
12f6c308 | 2144 | deflateInit(&stream, zlib_compression_level); |
93821bd9 | 2145 | size = 8 + deflateBound(&stream, len+hdrlen); |
812666c8 | 2146 | compressed = xmalloc(size); |
0fcfd160 LT |
2147 | |
2148 | /* Compress it */ | |
0fcfd160 LT |
2149 | stream.next_out = compressed; |
2150 | stream.avail_out = size; | |
a44c9a5e LT |
2151 | |
2152 | /* First header.. */ | |
d65a16f6 | 2153 | stream.next_in = (unsigned char *)hdr; |
a44c9a5e | 2154 | stream.avail_in = hdrlen; |
726f852b NP |
2155 | while (deflate(&stream, 0) == Z_OK) |
2156 | /* nothing */; | |
a44c9a5e LT |
2157 | |
2158 | /* Then the data itself.. */ | |
2159 | stream.next_in = buf; | |
2160 | stream.avail_in = len; | |
ac54c277 LT |
2161 | ret = deflate(&stream, Z_FINISH); |
2162 | if (ret != Z_STREAM_END) | |
2163 | die("unable to deflate new object %s (%d)", sha1_to_hex(sha1), ret); | |
2164 | ||
2165 | ret = deflateEnd(&stream); | |
2166 | if (ret != Z_OK) | |
2167 | die("deflateEnd on object %s failed (%d)", sha1_to_hex(sha1), ret); | |
2168 | ||
0fcfd160 LT |
2169 | size = stream.total_out; |
2170 | ||
4d548150 LT |
2171 | if (write_buffer(fd, compressed, size) < 0) |
2172 | die("unable to write sha1 file"); | |
aac17941 | 2173 | fchmod(fd, 0444); |
e82973cf JH |
2174 | if (close(fd)) |
2175 | die("unable to write sha1 file"); | |
383f85b7 | 2176 | free(compressed); |
0fcfd160 | 2177 | |
bbac7311 NP |
2178 | if (mtime) { |
2179 | struct utimbuf utb; | |
2180 | utb.actime = mtime; | |
2181 | utb.modtime = mtime; | |
2182 | if (utime(tmpfile, &utb) < 0) | |
2183 | warning("failed utime() on %s: %s", | |
2184 | tmpfile, strerror(errno)); | |
2185 | } | |
2186 | ||
230f1322 | 2187 | return move_temp_to_file(tmpfile, filename); |
0fcfd160 | 2188 | } |
8237b185 | 2189 | |
bbac7311 NP |
2190 | int write_sha1_file(void *buf, unsigned long len, const char *type, unsigned char *returnsha1) |
2191 | { | |
2192 | unsigned char sha1[20]; | |
2193 | char hdr[32]; | |
2194 | int hdrlen; | |
2195 | ||
2196 | /* Normally if we have it in the pack then we do not bother writing | |
2197 | * it out into .git/objects/??/?{38} file. | |
2198 | */ | |
2199 | write_sha1_file_prepare(buf, len, type, sha1, hdr, &hdrlen); | |
2200 | if (returnsha1) | |
2201 | hashcpy(returnsha1, sha1); | |
2202 | if (has_sha1_file(sha1)) | |
2203 | return 0; | |
2204 | return write_loose_object(sha1, hdr, hdrlen, buf, len, 0); | |
2205 | } | |
2206 | ||
2207 | int force_object_loose(const unsigned char *sha1, time_t mtime) | |
2208 | { | |
2209 | struct stat st; | |
2210 | void *buf; | |
2211 | unsigned long len; | |
2212 | enum object_type type; | |
2213 | char hdr[32]; | |
2214 | int hdrlen; | |
2215 | ||
2216 | if (find_sha1_file(sha1, &st)) | |
2217 | return 0; | |
2218 | buf = read_packed_sha1(sha1, &type, &len); | |
2219 | if (!buf) | |
2220 | return error("cannot read sha1_file for %s", sha1_to_hex(sha1)); | |
2221 | hdrlen = sprintf(hdr, "%s %lu", typename(type), len) + 1; | |
2222 | return write_loose_object(sha1, hdr, hdrlen, buf, len, mtime); | |
2223 | } | |
2224 | ||
4d548150 LT |
2225 | /* |
2226 | * We need to unpack and recompress the object for writing | |
2227 | * it out to a different file. | |
2228 | */ | |
2229 | static void *repack_object(const unsigned char *sha1, unsigned long *objsize) | |
a5eda52b | 2230 | { |
4d548150 | 2231 | size_t size; |
a5eda52b | 2232 | z_stream stream; |
4d548150 LT |
2233 | unsigned char *unpacked; |
2234 | unsigned long len; | |
21666f1a | 2235 | enum object_type type; |
d65a16f6 | 2236 | char hdr[32]; |
4d548150 LT |
2237 | int hdrlen; |
2238 | void *buf; | |
bfc66daf | 2239 | |
a9486b02 | 2240 | /* need to unpack and recompress it by itself */ |
21666f1a | 2241 | unpacked = read_packed_sha1(sha1, &type, &len); |
8276c007 PE |
2242 | if (!unpacked) |
2243 | error("cannot read sha1_file for %s", sha1_to_hex(sha1)); | |
a5eda52b | 2244 | |
21666f1a | 2245 | hdrlen = sprintf(hdr, "%s %lu", typename(type), len) + 1; |
a5eda52b | 2246 | |
4d548150 LT |
2247 | /* Set it up */ |
2248 | memset(&stream, 0, sizeof(stream)); | |
12f6c308 | 2249 | deflateInit(&stream, zlib_compression_level); |
4d548150 LT |
2250 | size = deflateBound(&stream, len + hdrlen); |
2251 | buf = xmalloc(size); | |
a5eda52b | 2252 | |
4d548150 LT |
2253 | /* Compress it */ |
2254 | stream.next_out = buf; | |
2255 | stream.avail_out = size; | |
a5eda52b | 2256 | |
4d548150 LT |
2257 | /* First header.. */ |
2258 | stream.next_in = (void *)hdr; | |
2259 | stream.avail_in = hdrlen; | |
2260 | while (deflate(&stream, 0) == Z_OK) | |
2261 | /* nothing */; | |
bfc66daf | 2262 | |
4d548150 LT |
2263 | /* Then the data itself.. */ |
2264 | stream.next_in = unpacked; | |
2265 | stream.avail_in = len; | |
2266 | while (deflate(&stream, Z_FINISH) == Z_OK) | |
2267 | /* nothing */; | |
2268 | deflateEnd(&stream); | |
2269 | free(unpacked); | |
bfc66daf | 2270 | |
4d548150 LT |
2271 | *objsize = stream.total_out; |
2272 | return buf; | |
2273 | } | |
2274 | ||
2275 | int write_sha1_to_fd(int fd, const unsigned char *sha1) | |
2276 | { | |
2277 | int retval; | |
2278 | unsigned long objsize; | |
bb6b8e4f | 2279 | void *buf = map_sha1_file(sha1, &objsize); |
4d548150 LT |
2280 | |
2281 | if (buf) { | |
2282 | retval = write_buffer(fd, buf, objsize); | |
2283 | munmap(buf, objsize); | |
2284 | return retval; | |
2285 | } | |
2286 | ||
2287 | buf = repack_object(sha1, &objsize); | |
2288 | retval = write_buffer(fd, buf, objsize); | |
2289 | free(buf); | |
2290 | return retval; | |
a5eda52b DB |
2291 | } |
2292 | ||
70b9829e DB |
2293 | int write_sha1_from_fd(const unsigned char *sha1, int fd, char *buffer, |
2294 | size_t bufsize, size_t *bufposn) | |
8237b185 | 2295 | { |
230f1322 | 2296 | char tmpfile[PATH_MAX]; |
8237b185 DB |
2297 | int local; |
2298 | z_stream stream; | |
2299 | unsigned char real_sha1[20]; | |
bf0f910d | 2300 | unsigned char discard[4096]; |
8237b185 DB |
2301 | int ret; |
2302 | SHA_CTX c; | |
2303 | ||
0e55181f | 2304 | snprintf(tmpfile, sizeof(tmpfile), "%s/tmp_obj_XXXXXX", get_object_directory()); |
8237b185 | 2305 | |
230f1322 | 2306 | local = mkstemp(tmpfile); |
916d081b PB |
2307 | if (local < 0) { |
2308 | if (errno == EPERM) | |
2309 | return error("insufficient permission for adding an object to repository database %s\n", get_object_directory()); | |
2310 | else | |
2311 | return error("unable to create temporary sha1 filename %s: %s\n", tmpfile, strerror(errno)); | |
2312 | } | |
8237b185 DB |
2313 | |
2314 | memset(&stream, 0, sizeof(stream)); | |
2315 | ||
2316 | inflateInit(&stream); | |
2317 | ||
2318 | SHA1_Init(&c); | |
2319 | ||
2320 | do { | |
2321 | ssize_t size; | |
70b9829e DB |
2322 | if (*bufposn) { |
2323 | stream.avail_in = *bufposn; | |
96ad15ae | 2324 | stream.next_in = (unsigned char *) buffer; |
70b9829e DB |
2325 | do { |
2326 | stream.next_out = discard; | |
2327 | stream.avail_out = sizeof(discard); | |
2328 | ret = inflate(&stream, Z_SYNC_FLUSH); | |
2329 | SHA1_Update(&c, discard, sizeof(discard) - | |
2330 | stream.avail_out); | |
2331 | } while (stream.avail_in && ret == Z_OK); | |
4d548150 LT |
2332 | if (write_buffer(local, buffer, *bufposn - stream.avail_in) < 0) |
2333 | die("unable to write sha1 file"); | |
70b9829e DB |
2334 | memmove(buffer, buffer + *bufposn - stream.avail_in, |
2335 | stream.avail_in); | |
2336 | *bufposn = stream.avail_in; | |
2337 | if (ret != Z_OK) | |
2338 | break; | |
2339 | } | |
93d26e4c | 2340 | size = xread(fd, buffer + *bufposn, bufsize - *bufposn); |
8237b185 DB |
2341 | if (size <= 0) { |
2342 | close(local); | |
230f1322 | 2343 | unlink(tmpfile); |
8237b185 DB |
2344 | if (!size) |
2345 | return error("Connection closed?"); | |
2346 | perror("Reading from connection"); | |
2347 | return -1; | |
2348 | } | |
70b9829e DB |
2349 | *bufposn += size; |
2350 | } while (1); | |
8237b185 DB |
2351 | inflateEnd(&stream); |
2352 | ||
b5b8d814 | 2353 | fchmod(local, 0444); |
0d315468 JM |
2354 | if (close(local) != 0) |
2355 | die("unable to write sha1 file"); | |
8237b185 DB |
2356 | SHA1_Final(real_sha1, &c); |
2357 | if (ret != Z_STREAM_END) { | |
230f1322 | 2358 | unlink(tmpfile); |
8237b185 DB |
2359 | return error("File %s corrupted", sha1_to_hex(sha1)); |
2360 | } | |
a89fccd2 | 2361 | if (hashcmp(sha1, real_sha1)) { |
230f1322 | 2362 | unlink(tmpfile); |
bd2afde8 | 2363 | return error("File %s has bad hash", sha1_to_hex(sha1)); |
8237b185 | 2364 | } |
230f1322 LT |
2365 | |
2366 | return move_temp_to_file(tmpfile, sha1_file_name(sha1)); | |
8237b185 DB |
2367 | } |
2368 | ||
bf592c50 DB |
2369 | int has_pack_index(const unsigned char *sha1) |
2370 | { | |
2371 | struct stat st; | |
2372 | if (stat(sha1_pack_index_name(sha1), &st)) | |
2373 | return 0; | |
2374 | return 1; | |
2375 | } | |
2376 | ||
2377 | int has_pack_file(const unsigned char *sha1) | |
2378 | { | |
2379 | struct stat st; | |
2380 | if (stat(sha1_pack_name(sha1), &st)) | |
2381 | return 0; | |
2382 | return 1; | |
2383 | } | |
2384 | ||
106d710b | 2385 | int has_sha1_pack(const unsigned char *sha1, const char **ignore_packed) |
dade09c2 LT |
2386 | { |
2387 | struct pack_entry e; | |
106d710b | 2388 | return find_pack_entry(sha1, &e, ignore_packed); |
dade09c2 LT |
2389 | } |
2390 | ||
8237b185 DB |
2391 | int has_sha1_file(const unsigned char *sha1) |
2392 | { | |
8237b185 | 2393 | struct stat st; |
1f688557 JH |
2394 | struct pack_entry e; |
2395 | ||
106d710b | 2396 | if (find_pack_entry(sha1, &e, NULL)) |
1f688557 | 2397 | return 1; |
ab90ea5d | 2398 | return find_sha1_file(sha1, &st) ? 1 : 0; |
8237b185 | 2399 | } |
74400e71 | 2400 | |
e7332f96 BE |
2401 | int index_pipe(unsigned char *sha1, int fd, const char *type, int write_object) |
2402 | { | |
fd17f5b5 | 2403 | struct strbuf buf; |
e7332f96 | 2404 | int ret; |
e7332f96 | 2405 | |
fd17f5b5 PH |
2406 | strbuf_init(&buf, 0); |
2407 | if (strbuf_read(&buf, fd, 4096) < 0) { | |
2408 | strbuf_release(&buf); | |
024510c8 DB |
2409 | return -1; |
2410 | } | |
e7332f96 | 2411 | |
024510c8 | 2412 | if (!type) |
8e440259 | 2413 | type = blob_type; |
024510c8 | 2414 | if (write_object) |
fd17f5b5 | 2415 | ret = write_sha1_file(buf.buf, buf.len, type, sha1); |
abdc3fc8 | 2416 | else |
fd17f5b5 PH |
2417 | ret = hash_sha1_file(buf.buf, buf.len, type, sha1); |
2418 | strbuf_release(&buf); | |
2419 | ||
024510c8 DB |
2420 | return ret; |
2421 | } | |
2422 | ||
edaec3fb | 2423 | int index_fd(unsigned char *sha1, int fd, struct stat *st, int write_object, |
53bca91a | 2424 | enum object_type type, const char *path) |
74400e71 | 2425 | { |
dc49cd76 | 2426 | size_t size = xsize_t(st->st_size); |
3a55602e | 2427 | void *buf = NULL; |
6c510bee | 2428 | int ret, re_allocated = 0; |
74400e71 | 2429 | |
74400e71 | 2430 | if (size) |
c4712e45 | 2431 | buf = xmmap(NULL, size, PROT_READ, MAP_PRIVATE, fd, 0); |
74400e71 | 2432 | close(fd); |
74400e71 | 2433 | |
7672db20 | 2434 | if (!type) |
edaec3fb | 2435 | type = OBJ_BLOB; |
6c510bee LT |
2436 | |
2437 | /* | |
2438 | * Convert blobs to git internal format | |
2439 | */ | |
d0d8e14d | 2440 | if ((type == OBJ_BLOB) && S_ISREG(st->st_mode)) { |
5ecd293d PH |
2441 | struct strbuf nbuf; |
2442 | strbuf_init(&nbuf, 0); | |
21e5ad50 SP |
2443 | if (convert_to_git(path, buf, size, &nbuf, |
2444 | write_object ? safe_crlf : 0)) { | |
ac78e548 | 2445 | munmap(buf, size); |
b315c5c0 | 2446 | buf = strbuf_detach(&nbuf, &size); |
6c510bee LT |
2447 | re_allocated = 1; |
2448 | } | |
2449 | } | |
2450 | ||
7672db20 | 2451 | if (write_object) |
edaec3fb | 2452 | ret = write_sha1_file(buf, size, typename(type), sha1); |
abdc3fc8 | 2453 | else |
edaec3fb | 2454 | ret = hash_sha1_file(buf, size, typename(type), sha1); |
6c510bee LT |
2455 | if (re_allocated) { |
2456 | free(buf); | |
2457 | return ret; | |
2458 | } | |
aac17941 LT |
2459 | if (size) |
2460 | munmap(buf, size); | |
2461 | return ret; | |
74400e71 | 2462 | } |
ec1fcc16 JH |
2463 | |
2464 | int index_path(unsigned char *sha1, const char *path, struct stat *st, int write_object) | |
2465 | { | |
2466 | int fd; | |
2467 | char *target; | |
dc49cd76 | 2468 | size_t len; |
ec1fcc16 JH |
2469 | |
2470 | switch (st->st_mode & S_IFMT) { | |
2471 | case S_IFREG: | |
2472 | fd = open(path, O_RDONLY); | |
2473 | if (fd < 0) | |
2474 | return error("open(\"%s\"): %s", path, | |
2475 | strerror(errno)); | |
53bca91a | 2476 | if (index_fd(sha1, fd, st, write_object, OBJ_BLOB, path) < 0) |
ec1fcc16 JH |
2477 | return error("%s: failed to insert into database", |
2478 | path); | |
2479 | break; | |
2480 | case S_IFLNK: | |
dc49cd76 SP |
2481 | len = xsize_t(st->st_size); |
2482 | target = xmalloc(len + 1); | |
2483 | if (readlink(path, target, len + 1) != st->st_size) { | |
ec1fcc16 JH |
2484 | char *errstr = strerror(errno); |
2485 | free(target); | |
2486 | return error("readlink(\"%s\"): %s", path, | |
2487 | errstr); | |
2488 | } | |
abdc3fc8 | 2489 | if (!write_object) |
dc49cd76 SP |
2490 | hash_sha1_file(target, len, blob_type, sha1); |
2491 | else if (write_sha1_file(target, len, blob_type, sha1)) | |
ec1fcc16 JH |
2492 | return error("%s: failed to insert into database", |
2493 | path); | |
2494 | free(target); | |
2495 | break; | |
f35a6d3b LT |
2496 | case S_IFDIR: |
2497 | return resolve_gitlink_ref(path, "HEAD", sha1); | |
ec1fcc16 JH |
2498 | default: |
2499 | return error("%s: unsupported file type", path); | |
2500 | } | |
2501 | return 0; | |
2502 | } | |
a69e5429 JH |
2503 | |
2504 | int read_pack_header(int fd, struct pack_header *header) | |
2505 | { | |
c697ad14 HO |
2506 | if (read_in_full(fd, header, sizeof(*header)) < sizeof(*header)) |
2507 | /* "eof before pack header was fully read" */ | |
2508 | return PH_ERROR_EOF; | |
2509 | ||
a69e5429 JH |
2510 | if (header->hdr_signature != htonl(PACK_SIGNATURE)) |
2511 | /* "protocol error (pack signature mismatch detected)" */ | |
2512 | return PH_ERROR_PACK_SIGNATURE; | |
2513 | if (!pack_version_ok(header->hdr_version)) | |
2514 | /* "protocol error (pack version unsupported)" */ | |
2515 | return PH_ERROR_PROTOCOL; | |
2516 | return 0; | |
2517 | } |