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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" | |
4dd1fbc7 | 14 | #include "run-command.h" |
8e440259 PE |
15 | #include "tag.h" |
16 | #include "tree.h" | |
c879daa2 | 17 | #include "tree-walk.h" |
f35a6d3b | 18 | #include "refs.h" |
70f5d5d3 | 19 | #include "pack-revindex.h" |
628522ec | 20 | #include "sha1-lookup.h" |
568508e7 | 21 | #include "bulk-checkin.h" |
0fcfd160 | 22 | |
144bde78 LT |
23 | #ifndef O_NOATIME |
24 | #if defined(__linux__) && (defined(__i386__) || defined(__PPC__)) | |
25 | #define O_NOATIME 01000000 | |
26 | #else | |
27 | #define O_NOATIME 0 | |
28 | #endif | |
29 | #endif | |
30 | ||
28bd70d8 JN |
31 | #define SZ_FMT PRIuMAX |
32 | static inline uintmax_t sz_fmt(size_t s) { return s; } | |
e05db0fd | 33 | |
96f1e58f | 34 | const unsigned char null_sha1[20]; |
88cd621d | 35 | |
c597ba80 NTND |
36 | /* |
37 | * This is meant to hold a *small* number of objects that you would | |
38 | * want read_sha1_file() to be able to return, but yet you do not want | |
39 | * to write them into the object store (e.g. a browse-only | |
40 | * application). | |
41 | */ | |
42 | static struct cached_object { | |
43 | unsigned char sha1[20]; | |
44 | enum object_type type; | |
45 | void *buf; | |
46 | unsigned long size; | |
47 | } *cached_objects; | |
48 | static int cached_object_nr, cached_object_alloc; | |
49 | ||
50 | static struct cached_object empty_tree = { | |
dab0d410 | 51 | EMPTY_TREE_SHA1_BIN_LITERAL, |
c597ba80 NTND |
52 | OBJ_TREE, |
53 | "", | |
54 | 0 | |
55 | }; | |
56 | ||
57 | static struct cached_object *find_cached_object(const unsigned char *sha1) | |
58 | { | |
59 | int i; | |
60 | struct cached_object *co = cached_objects; | |
61 | ||
62 | for (i = 0; i < cached_object_nr; i++, co++) { | |
63 | if (!hashcmp(co->sha1, sha1)) | |
64 | return co; | |
65 | } | |
66 | if (!hashcmp(sha1, empty_tree.sha1)) | |
67 | return &empty_tree; | |
68 | return NULL; | |
69 | } | |
70 | ||
90a6464b JH |
71 | int mkdir_in_gitdir(const char *path) |
72 | { | |
73 | if (mkdir(path, 0777)) { | |
74 | int saved_errno = errno; | |
75 | struct stat st; | |
76 | struct strbuf sb = STRBUF_INIT; | |
77 | ||
78 | if (errno != EEXIST) | |
79 | return -1; | |
80 | /* | |
81 | * Are we looking at a path in a symlinked worktree | |
82 | * whose original repository does not yet have it? | |
83 | * e.g. .git/rr-cache pointing at its original | |
84 | * repository in which the user hasn't performed any | |
85 | * conflict resolution yet? | |
86 | */ | |
87 | if (lstat(path, &st) || !S_ISLNK(st.st_mode) || | |
88 | strbuf_readlink(&sb, path, st.st_size) || | |
89 | !is_absolute_path(sb.buf) || | |
90 | mkdir(sb.buf, 0777)) { | |
91 | strbuf_release(&sb); | |
92 | errno = saved_errno; | |
93 | return -1; | |
94 | } | |
95 | strbuf_release(&sb); | |
96 | } | |
97 | return adjust_shared_perm(path); | |
98 | } | |
99 | ||
b2cb9425 JH |
100 | int safe_create_leading_directories(char *path) |
101 | { | |
8385abfd | 102 | char *pos = path + offset_1st_component(path); |
67d42212 JR |
103 | struct stat st; |
104 | ||
b2cb9425 JH |
105 | while (pos) { |
106 | pos = strchr(pos, '/'); | |
107 | if (!pos) | |
108 | break; | |
5f0bdf50 JH |
109 | while (*++pos == '/') |
110 | ; | |
111 | if (!*pos) | |
112 | break; | |
113 | *--pos = '\0'; | |
67d42212 JR |
114 | if (!stat(path, &st)) { |
115 | /* path exists */ | |
116 | if (!S_ISDIR(st.st_mode)) { | |
b2cb9425 | 117 | *pos = '/'; |
67d42212 | 118 | return -3; |
b2cb9425 | 119 | } |
457f06d6 | 120 | } |
67d42212 JR |
121 | else if (mkdir(path, 0777)) { |
122 | *pos = '/'; | |
123 | return -1; | |
124 | } | |
457f06d6 JS |
125 | else if (adjust_shared_perm(path)) { |
126 | *pos = '/'; | |
127 | return -2; | |
128 | } | |
b2cb9425 JH |
129 | *pos++ = '/'; |
130 | } | |
131 | return 0; | |
132 | } | |
723c31fe | 133 | |
8e21d63b JK |
134 | int safe_create_leading_directories_const(const char *path) |
135 | { | |
136 | /* path points to cache entries, so xstrdup before messing with it */ | |
137 | char *buf = xstrdup(path); | |
138 | int result = safe_create_leading_directories(buf); | |
139 | free(buf); | |
140 | return result; | |
141 | } | |
142 | ||
ace1534d JH |
143 | static void fill_sha1_path(char *pathbuf, const unsigned char *sha1) |
144 | { | |
145 | int i; | |
146 | for (i = 0; i < 20; i++) { | |
147 | static char hex[] = "0123456789abcdef"; | |
148 | unsigned int val = sha1[i]; | |
149 | char *pos = pathbuf + i*2 + (i > 0); | |
150 | *pos++ = hex[val >> 4]; | |
151 | *pos = hex[val & 0xf]; | |
152 | } | |
153 | } | |
154 | ||
0fcfd160 LT |
155 | /* |
156 | * NOTE! This returns a statically allocated buffer, so you have to be | |
790296fd | 157 | * careful about using it. Do an "xstrdup()" if you need to save the |
0fcfd160 | 158 | * filename. |
ace1534d JH |
159 | * |
160 | * Also note that this returns the location for creating. Reading | |
161 | * SHA1 file can happen from any alternate directory listed in the | |
d19938ab | 162 | * DB_ENVIRONMENT environment variable if it is not found in |
ace1534d | 163 | * the primary object database. |
0fcfd160 LT |
164 | */ |
165 | char *sha1_file_name(const unsigned char *sha1) | |
166 | { | |
560fb6a1 JK |
167 | static char buf[PATH_MAX]; |
168 | const char *objdir; | |
169 | int len; | |
0fcfd160 | 170 | |
560fb6a1 JK |
171 | objdir = get_object_directory(); |
172 | len = strlen(objdir); | |
173 | ||
174 | /* '/' + sha1(2) + '/' + sha1(38) + '\0' */ | |
175 | if (len + 43 > PATH_MAX) | |
176 | die("insanely long object directory %s", objdir); | |
177 | memcpy(buf, objdir, len); | |
178 | buf[len] = '/'; | |
179 | buf[len+3] = '/'; | |
180 | buf[len+42] = '\0'; | |
181 | fill_sha1_path(buf + len + 1, sha1); | |
182 | return buf; | |
0fcfd160 LT |
183 | } |
184 | ||
633f43e1 | 185 | static char *sha1_get_pack_name(const unsigned char *sha1, |
6eec46bd | 186 | char **name, char **base, const char *which) |
bf592c50 DB |
187 | { |
188 | static const char hex[] = "0123456789abcdef"; | |
633f43e1 | 189 | char *buf; |
bf592c50 DB |
190 | int i; |
191 | ||
633f43e1 | 192 | if (!*base) { |
bf592c50 DB |
193 | const char *sha1_file_directory = get_object_directory(); |
194 | int len = strlen(sha1_file_directory); | |
633f43e1 | 195 | *base = xmalloc(len + 60); |
6eec46bd JH |
196 | sprintf(*base, "%s/pack/pack-1234567890123456789012345678901234567890.%s", |
197 | sha1_file_directory, which); | |
633f43e1 | 198 | *name = *base + len + 11; |
bf592c50 DB |
199 | } |
200 | ||
633f43e1 | 201 | buf = *name; |
bf592c50 DB |
202 | |
203 | for (i = 0; i < 20; i++) { | |
204 | unsigned int val = *sha1++; | |
205 | *buf++ = hex[val >> 4]; | |
206 | *buf++ = hex[val & 0xf]; | |
207 | } | |
a6080a0a | 208 | |
633f43e1 | 209 | return *base; |
bf592c50 DB |
210 | } |
211 | ||
633f43e1 | 212 | char *sha1_pack_name(const unsigned char *sha1) |
bf592c50 | 213 | { |
633f43e1 | 214 | static char *name, *base; |
bf592c50 | 215 | |
6eec46bd | 216 | return sha1_get_pack_name(sha1, &name, &base, "pack"); |
633f43e1 | 217 | } |
bf592c50 | 218 | |
633f43e1 HO |
219 | char *sha1_pack_index_name(const unsigned char *sha1) |
220 | { | |
221 | static char *name, *base; | |
a6080a0a | 222 | |
6eec46bd | 223 | return sha1_get_pack_name(sha1, &name, &base, "idx"); |
bf592c50 DB |
224 | } |
225 | ||
d5a63b99 JH |
226 | struct alternate_object_database *alt_odb_list; |
227 | static struct alternate_object_database **alt_odb_tail; | |
ace1534d | 228 | |
c2f493a4 | 229 | static void read_info_alternates(const char * alternates, int depth); |
f4e51683 | 230 | static int git_open_noatime(const char *name); |
c2f493a4 | 231 | |
ddd5d056 JH |
232 | /* |
233 | * Prepare alternate object database registry. | |
d5a63b99 JH |
234 | * |
235 | * The variable alt_odb_list points at the list of struct | |
236 | * alternate_object_database. The elements on this list come from | |
237 | * non-empty elements from colon separated ALTERNATE_DB_ENVIRONMENT | |
238 | * environment variable, and $GIT_OBJECT_DIRECTORY/info/alternates, | |
1494e038 JH |
239 | * whose contents is similar to that environment variable but can be |
240 | * LF separated. Its base points at a statically allocated buffer that | |
d5a63b99 JH |
241 | * contains "/the/directory/corresponding/to/.git/objects/...", while |
242 | * its name points just after the slash at the end of ".git/objects/" | |
243 | * in the example above, and has enough space to hold 40-byte hex | |
244 | * SHA1, an extra slash for the first level indirection, and the | |
245 | * terminating NUL. | |
ddd5d056 | 246 | */ |
c2f493a4 | 247 | static int link_alt_odb_entry(const char * entry, int len, const char * relative_base, int depth) |
ace1534d | 248 | { |
1494e038 | 249 | const char *objdir = get_object_directory(); |
c2f493a4 MW |
250 | struct alternate_object_database *ent; |
251 | struct alternate_object_database *alt; | |
5bdf0a84 HW |
252 | int pfxlen, entlen; |
253 | struct strbuf pathbuf = STRBUF_INIT; | |
d5a63b99 | 254 | |
85dadc38 | 255 | if (!is_absolute_path(entry) && relative_base) { |
5bdf0a84 HW |
256 | strbuf_addstr(&pathbuf, real_path(relative_base)); |
257 | strbuf_addch(&pathbuf, '/'); | |
c2f493a4 | 258 | } |
5bdf0a84 | 259 | strbuf_add(&pathbuf, entry, len); |
c2f493a4 | 260 | |
5bdf0a84 HW |
261 | normalize_path_copy(pathbuf.buf, pathbuf.buf); |
262 | ||
263 | pfxlen = strlen(pathbuf.buf); | |
264 | ||
265 | /* | |
266 | * The trailing slash after the directory name is given by | |
267 | * this function at the end. Remove duplicates. | |
268 | */ | |
269 | while (pfxlen && pathbuf.buf[pfxlen-1] == '/') | |
270 | pfxlen -= 1; | |
271 | ||
272 | entlen = pfxlen + 43; /* '/' + 2 hex + '/' + 38 hex + NUL */ | |
273 | ent = xmalloc(sizeof(*ent) + entlen); | |
274 | memcpy(ent->base, pathbuf.buf, pfxlen); | |
275 | strbuf_release(&pathbuf); | |
c2f493a4 MW |
276 | |
277 | ent->name = ent->base + pfxlen + 1; | |
278 | ent->base[pfxlen + 3] = '/'; | |
279 | ent->base[pfxlen] = ent->base[entlen-1] = 0; | |
280 | ||
281 | /* Detect cases where alternate disappeared */ | |
90b4a71c | 282 | if (!is_directory(ent->base)) { |
c2f493a4 MW |
283 | error("object directory %s does not exist; " |
284 | "check .git/objects/info/alternates.", | |
285 | ent->base); | |
286 | free(ent); | |
287 | return -1; | |
288 | } | |
289 | ||
290 | /* Prevent the common mistake of listing the same | |
291 | * thing twice, or object directory itself. | |
292 | */ | |
293 | for (alt = alt_odb_list; alt; alt = alt->next) { | |
294 | if (!memcmp(ent->base, alt->base, pfxlen)) { | |
295 | free(ent); | |
296 | return -1; | |
297 | } | |
298 | } | |
299 | if (!memcmp(ent->base, objdir, pfxlen)) { | |
300 | free(ent); | |
301 | return -1; | |
302 | } | |
303 | ||
304 | /* add the alternate entry */ | |
305 | *alt_odb_tail = ent; | |
306 | alt_odb_tail = &(ent->next); | |
307 | ent->next = NULL; | |
308 | ||
309 | /* recursively add alternates */ | |
310 | read_info_alternates(ent->base, depth + 1); | |
311 | ||
312 | ent->base[pfxlen] = '/'; | |
313 | ||
314 | return 0; | |
315 | } | |
316 | ||
317 | static void link_alt_odb_entries(const char *alt, const char *ep, int sep, | |
318 | const char *relative_base, int depth) | |
319 | { | |
320 | const char *cp, *last; | |
321 | ||
322 | if (depth > 5) { | |
323 | error("%s: ignoring alternate object stores, nesting too deep.", | |
324 | relative_base); | |
325 | return; | |
326 | } | |
327 | ||
d5a63b99 | 328 | last = alt; |
9577e7e3 JH |
329 | while (last < ep) { |
330 | cp = last; | |
331 | if (cp < ep && *cp == '#') { | |
332 | while (cp < ep && *cp != sep) | |
333 | cp++; | |
334 | last = cp + 1; | |
335 | continue; | |
336 | } | |
c2f493a4 MW |
337 | while (cp < ep && *cp != sep) |
338 | cp++; | |
d5a63b99 | 339 | if (last != cp) { |
85dadc38 | 340 | if (!is_absolute_path(last) && depth) { |
c2f493a4 MW |
341 | error("%s: ignoring relative alternate object store %s", |
342 | relative_base, last); | |
343 | } else { | |
344 | link_alt_odb_entry(last, cp - last, | |
345 | relative_base, depth); | |
1494e038 | 346 | } |
d5a63b99 | 347 | } |
9577e7e3 | 348 | while (cp < ep && *cp == sep) |
d5a63b99 JH |
349 | cp++; |
350 | last = cp; | |
9577e7e3 | 351 | } |
d5a63b99 JH |
352 | } |
353 | ||
c2f493a4 | 354 | static void read_info_alternates(const char * relative_base, int depth) |
d5a63b99 | 355 | { |
9577e7e3 | 356 | char *map; |
dc49cd76 | 357 | size_t mapsz; |
d5a63b99 | 358 | struct stat st; |
9cb18f56 JM |
359 | const char alt_file_name[] = "info/alternates"; |
360 | /* Given that relative_base is no longer than PATH_MAX, | |
361 | ensure that "path" has enough space to append "/", the | |
362 | file name, "info/alternates", and a trailing NUL. */ | |
363 | char path[PATH_MAX + 1 + sizeof alt_file_name]; | |
c2f493a4 | 364 | int fd; |
d5a63b99 | 365 | |
9cb18f56 | 366 | sprintf(path, "%s/%s", relative_base, alt_file_name); |
f4e51683 | 367 | fd = git_open_noatime(path); |
d5a63b99 JH |
368 | if (fd < 0) |
369 | return; | |
370 | if (fstat(fd, &st) || (st.st_size == 0)) { | |
371 | close(fd); | |
9a217f2a | 372 | return; |
ace1534d | 373 | } |
dc49cd76 SP |
374 | mapsz = xsize_t(st.st_size); |
375 | map = xmmap(NULL, mapsz, PROT_READ, MAP_PRIVATE, fd, 0); | |
d5a63b99 | 376 | close(fd); |
d5a63b99 | 377 | |
dc49cd76 | 378 | link_alt_odb_entries(map, map + mapsz, '\n', relative_base, depth); |
c2f493a4 | 379 | |
dc49cd76 | 380 | munmap(map, mapsz); |
ace1534d JH |
381 | } |
382 | ||
bef70b22 DB |
383 | void add_to_alternates_file(const char *reference) |
384 | { | |
385 | struct lock_file *lock = xcalloc(1, sizeof(struct lock_file)); | |
acd3b9ec | 386 | int fd = hold_lock_file_for_append(lock, git_path("objects/info/alternates"), LOCK_DIE_ON_ERROR); |
e6baf4a1 | 387 | char *alt = mkpath("%s\n", reference); |
bef70b22 DB |
388 | write_or_die(fd, alt, strlen(alt)); |
389 | if (commit_lock_file(lock)) | |
390 | die("could not close alternates file"); | |
391 | if (alt_odb_tail) | |
392 | link_alt_odb_entries(alt, alt + strlen(alt), '\n', NULL, 0); | |
393 | } | |
394 | ||
d79796bc JH |
395 | void foreach_alt_odb(alt_odb_fn fn, void *cb) |
396 | { | |
397 | struct alternate_object_database *ent; | |
398 | ||
399 | prepare_alt_odb(); | |
400 | for (ent = alt_odb_list; ent; ent = ent->next) | |
401 | if (fn(ent, cb)) | |
402 | return; | |
403 | } | |
404 | ||
c2f493a4 MW |
405 | void prepare_alt_odb(void) |
406 | { | |
554fe20d | 407 | const char *alt; |
c2f493a4 | 408 | |
7dc24aa5 SP |
409 | if (alt_odb_tail) |
410 | return; | |
411 | ||
c2f493a4 MW |
412 | alt = getenv(ALTERNATE_DB_ENVIRONMENT); |
413 | if (!alt) alt = ""; | |
414 | ||
c2f493a4 | 415 | alt_odb_tail = &alt_odb_list; |
80ba074f | 416 | link_alt_odb_entries(alt, alt + strlen(alt), PATH_SEP, NULL, 0); |
c2f493a4 MW |
417 | |
418 | read_info_alternates(get_object_directory(), 0); | |
419 | } | |
420 | ||
0f4dc14a | 421 | static int has_loose_object_local(const unsigned char *sha1) |
ace1534d | 422 | { |
ace1534d | 423 | char *name = sha1_file_name(sha1); |
0f4dc14a BC |
424 | return !access(name, F_OK); |
425 | } | |
ace1534d | 426 | |
0f4dc14a BC |
427 | int has_loose_object_nonlocal(const unsigned char *sha1) |
428 | { | |
429 | struct alternate_object_database *alt; | |
9a217f2a | 430 | prepare_alt_odb(); |
d5a63b99 | 431 | for (alt = alt_odb_list; alt; alt = alt->next) { |
0f4dc14a | 432 | fill_sha1_path(alt->name, sha1); |
c529d75a LT |
433 | if (!access(alt->base, F_OK)) |
434 | return 1; | |
ace1534d | 435 | } |
c529d75a | 436 | return 0; |
ace1534d JH |
437 | } |
438 | ||
0f4dc14a BC |
439 | static int has_loose_object(const unsigned char *sha1) |
440 | { | |
441 | return has_loose_object_local(sha1) || | |
442 | has_loose_object_nonlocal(sha1); | |
443 | } | |
444 | ||
60bb8b14 | 445 | static unsigned int pack_used_ctr; |
a53128b6 SP |
446 | static unsigned int pack_mmap_calls; |
447 | static unsigned int peak_pack_open_windows; | |
448 | static unsigned int pack_open_windows; | |
c7934306 SP |
449 | static unsigned int pack_open_fds; |
450 | static unsigned int pack_max_fds; | |
a53128b6 | 451 | static size_t peak_pack_mapped; |
60bb8b14 | 452 | static size_t pack_mapped; |
9a217f2a | 453 | struct packed_git *packed_git; |
1f688557 | 454 | |
b79d18c9 | 455 | void pack_report(void) |
a53128b6 SP |
456 | { |
457 | fprintf(stderr, | |
e05db0fd PR |
458 | "pack_report: getpagesize() = %10" SZ_FMT "\n" |
459 | "pack_report: core.packedGitWindowSize = %10" SZ_FMT "\n" | |
460 | "pack_report: core.packedGitLimit = %10" SZ_FMT "\n", | |
9e42d6a1 SP |
461 | sz_fmt(getpagesize()), |
462 | sz_fmt(packed_git_window_size), | |
463 | sz_fmt(packed_git_limit)); | |
a53128b6 SP |
464 | fprintf(stderr, |
465 | "pack_report: pack_used_ctr = %10u\n" | |
466 | "pack_report: pack_mmap_calls = %10u\n" | |
467 | "pack_report: pack_open_windows = %10u / %10u\n" | |
e05db0fd PR |
468 | "pack_report: pack_mapped = " |
469 | "%10" SZ_FMT " / %10" SZ_FMT "\n", | |
a53128b6 SP |
470 | pack_used_ctr, |
471 | pack_mmap_calls, | |
472 | pack_open_windows, peak_pack_open_windows, | |
9e42d6a1 | 473 | sz_fmt(pack_mapped), sz_fmt(peak_pack_mapped)); |
a53128b6 SP |
474 | } |
475 | ||
42873078 | 476 | static int check_packed_git_idx(const char *path, struct packed_git *p) |
1f688557 JH |
477 | { |
478 | void *idx_map; | |
42873078 | 479 | struct pack_idx_header *hdr; |
dc49cd76 | 480 | size_t idx_size; |
74e34e1f | 481 | uint32_t version, nr, i, *index; |
f4e51683 | 482 | int fd = git_open_noatime(path); |
1f688557 | 483 | struct stat st; |
42873078 | 484 | |
1f688557 JH |
485 | if (fd < 0) |
486 | return -1; | |
487 | if (fstat(fd, &st)) { | |
488 | close(fd); | |
489 | return -1; | |
490 | } | |
dc49cd76 | 491 | idx_size = xsize_t(st.st_size); |
2d88451b SP |
492 | if (idx_size < 4 * 256 + 20 + 20) { |
493 | close(fd); | |
494 | return error("index file %s is too small", path); | |
495 | } | |
c4712e45 | 496 | idx_map = xmmap(NULL, idx_size, PROT_READ, MAP_PRIVATE, fd, 0); |
1f688557 | 497 | close(fd); |
1f688557 | 498 | |
42873078 NP |
499 | hdr = idx_map; |
500 | if (hdr->idx_signature == htonl(PACK_IDX_SIGNATURE)) { | |
74e34e1f NP |
501 | version = ntohl(hdr->idx_version); |
502 | if (version < 2 || version > 2) { | |
503 | munmap(idx_map, idx_size); | |
6e1c2344 | 504 | return error("index file %s is version %"PRIu32 |
74e34e1f NP |
505 | " and is not supported by this binary" |
506 | " (try upgrading GIT to a newer version)", | |
507 | path, version); | |
508 | } | |
509 | } else | |
510 | version = 1; | |
df1b059d | 511 | |
1f688557 | 512 | nr = 0; |
42873078 | 513 | index = idx_map; |
74e34e1f NP |
514 | if (version > 1) |
515 | index += 2; /* skip index header */ | |
1f688557 | 516 | for (i = 0; i < 256; i++) { |
326bf396 | 517 | uint32_t n = ntohl(index[i]); |
2d88451b SP |
518 | if (n < nr) { |
519 | munmap(idx_map, idx_size); | |
df1b059d | 520 | return error("non-monotonic index %s", path); |
2d88451b | 521 | } |
1f688557 JH |
522 | nr = n; |
523 | } | |
524 | ||
74e34e1f NP |
525 | if (version == 1) { |
526 | /* | |
527 | * Total size: | |
528 | * - 256 index entries 4 bytes each | |
529 | * - 24-byte entries * nr (20-byte sha1 + 4-byte offset) | |
530 | * - 20-byte SHA1 of the packfile | |
531 | * - 20-byte SHA1 file checksum | |
532 | */ | |
533 | if (idx_size != 4*256 + nr * 24 + 20 + 20) { | |
534 | munmap(idx_map, idx_size); | |
eef427a0 | 535 | return error("wrong index v1 file size in %s", path); |
74e34e1f NP |
536 | } |
537 | } else if (version == 2) { | |
538 | /* | |
539 | * Minimum size: | |
540 | * - 8 bytes of header | |
541 | * - 256 index entries 4 bytes each | |
542 | * - 20-byte sha1 entry * nr | |
543 | * - 4-byte crc entry * nr | |
544 | * - 4-byte offset entry * nr | |
545 | * - 20-byte SHA1 of the packfile | |
546 | * - 20-byte SHA1 file checksum | |
547 | * And after the 4-byte offset table might be a | |
548 | * variable sized table containing 8-byte entries | |
549 | * for offsets larger than 2^31. | |
550 | */ | |
551 | unsigned long min_size = 8 + 4*256 + nr*(20 + 4 + 4) + 20 + 20; | |
1164f1e4 LT |
552 | unsigned long max_size = min_size; |
553 | if (nr) | |
554 | max_size += (nr - 1)*8; | |
555 | if (idx_size < min_size || idx_size > max_size) { | |
74e34e1f | 556 | munmap(idx_map, idx_size); |
eef427a0 | 557 | return error("wrong index v2 file size in %s", path); |
74e34e1f | 558 | } |
7109c889 JH |
559 | if (idx_size != min_size && |
560 | /* | |
561 | * make sure we can deal with large pack offsets. | |
562 | * 31-bit signed offset won't be enough, neither | |
563 | * 32-bit unsigned one will be. | |
564 | */ | |
565 | (sizeof(off_t) <= 4)) { | |
566 | munmap(idx_map, idx_size); | |
567 | return error("pack too large for current definition of off_t in %s", path); | |
74e34e1f | 568 | } |
2d88451b | 569 | } |
1f688557 | 570 | |
74e34e1f | 571 | p->index_version = version; |
42873078 NP |
572 | p->index_data = idx_map; |
573 | p->index_size = idx_size; | |
57059091 | 574 | p->num_objects = nr; |
1f688557 JH |
575 | return 0; |
576 | } | |
577 | ||
bc8e478a | 578 | int open_pack_index(struct packed_git *p) |
d079837e SP |
579 | { |
580 | char *idx_name; | |
581 | int ret; | |
582 | ||
583 | if (p->index_data) | |
584 | return 0; | |
585 | ||
586 | idx_name = xstrdup(p->pack_name); | |
587 | strcpy(idx_name + strlen(idx_name) - strlen(".pack"), ".idx"); | |
588 | ret = check_packed_git_idx(idx_name, p); | |
589 | free(idx_name); | |
590 | return ret; | |
591 | } | |
592 | ||
11daf39b SP |
593 | static void scan_windows(struct packed_git *p, |
594 | struct packed_git **lru_p, | |
595 | struct pack_window **lru_w, | |
596 | struct pack_window **lru_l) | |
1f688557 | 597 | { |
11daf39b SP |
598 | struct pack_window *w, *w_l; |
599 | ||
600 | for (w_l = NULL, w = p->windows; w; w = w->next) { | |
601 | if (!w->inuse_cnt) { | |
602 | if (!*lru_w || w->last_used < (*lru_w)->last_used) { | |
603 | *lru_p = p; | |
604 | *lru_w = w; | |
605 | *lru_l = w_l; | |
54044bf8 | 606 | } |
54044bf8 | 607 | } |
11daf39b | 608 | w_l = w; |
f9253394 | 609 | } |
11daf39b SP |
610 | } |
611 | ||
d1efefa4 | 612 | static int unuse_one_window(struct packed_git *current, int keep_fd) |
11daf39b SP |
613 | { |
614 | struct packed_git *p, *lru_p = NULL; | |
615 | struct pack_window *lru_w = NULL, *lru_l = NULL; | |
616 | ||
617 | if (current) | |
618 | scan_windows(current, &lru_p, &lru_w, &lru_l); | |
619 | for (p = packed_git; p; p = p->next) | |
620 | scan_windows(p, &lru_p, &lru_w, &lru_l); | |
54044bf8 SP |
621 | if (lru_p) { |
622 | munmap(lru_w->base, lru_w->len); | |
623 | pack_mapped -= lru_w->len; | |
624 | if (lru_l) | |
625 | lru_l->next = lru_w->next; | |
626 | else { | |
627 | lru_p->windows = lru_w->next; | |
d131b7af SP |
628 | if (!lru_p->windows && lru_p->pack_fd != -1 |
629 | && lru_p->pack_fd != keep_fd) { | |
54044bf8 | 630 | close(lru_p->pack_fd); |
c7934306 | 631 | pack_open_fds--; |
54044bf8 SP |
632 | lru_p->pack_fd = -1; |
633 | } | |
634 | } | |
635 | free(lru_w); | |
a53128b6 | 636 | pack_open_windows--; |
54044bf8 SP |
637 | return 1; |
638 | } | |
639 | return 0; | |
f9253394 JH |
640 | } |
641 | ||
d1efefa4 | 642 | void release_pack_memory(size_t need, int fd) |
97bfeb34 SP |
643 | { |
644 | size_t cur = pack_mapped; | |
d1efefa4 | 645 | while (need >= (cur - pack_mapped) && unuse_one_window(NULL, fd)) |
97bfeb34 SP |
646 | ; /* nothing */ |
647 | } | |
648 | ||
58ecbd5e JN |
649 | void *xmmap(void *start, size_t length, |
650 | int prot, int flags, int fd, off_t offset) | |
651 | { | |
652 | void *ret = mmap(start, length, prot, flags, fd, offset); | |
653 | if (ret == MAP_FAILED) { | |
654 | if (!length) | |
655 | return NULL; | |
656 | release_pack_memory(length, fd); | |
657 | ret = mmap(start, length, prot, flags, fd, offset); | |
658 | if (ret == MAP_FAILED) | |
659 | die_errno("Out of memory? mmap failed"); | |
660 | } | |
661 | return ret; | |
662 | } | |
663 | ||
c9ced051 SP |
664 | void close_pack_windows(struct packed_git *p) |
665 | { | |
666 | while (p->windows) { | |
667 | struct pack_window *w = p->windows; | |
668 | ||
669 | if (w->inuse_cnt) | |
670 | die("pack '%s' still has open windows to it", | |
671 | p->pack_name); | |
672 | munmap(w->base, w->len); | |
673 | pack_mapped -= w->len; | |
674 | pack_open_windows--; | |
675 | p->windows = w->next; | |
676 | free(w); | |
677 | } | |
678 | } | |
679 | ||
03e79c88 | 680 | void unuse_pack(struct pack_window **w_cursor) |
f9253394 | 681 | { |
03e79c88 SP |
682 | struct pack_window *w = *w_cursor; |
683 | if (w) { | |
684 | w->inuse_cnt--; | |
685 | *w_cursor = NULL; | |
686 | } | |
1f688557 JH |
687 | } |
688 | ||
fa5fc15d SP |
689 | void close_pack_index(struct packed_git *p) |
690 | { | |
691 | if (p->index_data) { | |
692 | munmap((void *)p->index_data, p->index_size); | |
693 | p->index_data = NULL; | |
694 | } | |
695 | } | |
696 | ||
c74faea1 NP |
697 | /* |
698 | * This is used by git-repack in case a newly created pack happens to | |
699 | * contain the same set of objects as an existing one. In that case | |
700 | * the resulting file might be different even if its name would be the | |
701 | * same. It is best to close any reference to the old pack before it is | |
702 | * replaced on disk. Of course no index pointers nor windows for given pack | |
703 | * must subsist at this point. If ever objects from this pack are requested | |
704 | * again, the new version of the pack will be reinitialized through | |
705 | * reprepare_packed_git(). | |
706 | */ | |
707 | void free_pack_by_name(const char *pack_name) | |
708 | { | |
709 | struct packed_git *p, **pp = &packed_git; | |
710 | ||
711 | while (*pp) { | |
712 | p = *pp; | |
713 | if (strcmp(pack_name, p->pack_name) == 0) { | |
fa3a0c94 | 714 | clear_delta_base_cache(); |
c74faea1 | 715 | close_pack_windows(p); |
c7934306 | 716 | if (p->pack_fd != -1) { |
c74faea1 | 717 | close(p->pack_fd); |
c7934306 SP |
718 | pack_open_fds--; |
719 | } | |
fa5fc15d | 720 | close_pack_index(p); |
c74faea1 NP |
721 | free(p->bad_object_sha1); |
722 | *pp = p->next; | |
723 | free(p); | |
724 | return; | |
725 | } | |
726 | pp = &p->next; | |
727 | } | |
728 | } | |
729 | ||
3cf8b462 SP |
730 | /* |
731 | * Do not call this directly as this leaks p->pack_fd on error return; | |
732 | * call open_packed_git() instead. | |
733 | */ | |
734 | static int open_packed_git_1(struct packed_git *p) | |
1f688557 | 735 | { |
9bc879c1 SP |
736 | struct stat st; |
737 | struct pack_header hdr; | |
738 | unsigned char sha1[20]; | |
739 | unsigned char *idx_sha1; | |
2c039da8 | 740 | long fd_flag; |
9bc879c1 | 741 | |
d079837e SP |
742 | if (!p->index_data && open_pack_index(p)) |
743 | return error("packfile %s index unavailable", p->pack_name); | |
744 | ||
c7934306 SP |
745 | if (!pack_max_fds) { |
746 | struct rlimit lim; | |
747 | unsigned int max_fds; | |
748 | ||
749 | if (getrlimit(RLIMIT_NOFILE, &lim)) | |
750 | die_errno("cannot get RLIMIT_NOFILE"); | |
751 | ||
752 | max_fds = lim.rlim_cur; | |
753 | ||
754 | /* Save 3 for stdin/stdout/stderr, 22 for work */ | |
755 | if (25 < max_fds) | |
756 | pack_max_fds = max_fds - 25; | |
757 | else | |
758 | pack_max_fds = 1; | |
759 | } | |
760 | ||
761 | while (pack_max_fds <= pack_open_fds && unuse_one_window(NULL, -1)) | |
762 | ; /* nothing */ | |
763 | ||
f4e51683 | 764 | p->pack_fd = git_open_noatime(p->pack_name); |
9bc879c1 | 765 | if (p->pack_fd < 0 || fstat(p->pack_fd, &st)) |
072db278 | 766 | return -1; |
c7934306 | 767 | pack_open_fds++; |
9bc879c1 SP |
768 | |
769 | /* If we created the struct before we had the pack we lack size. */ | |
bf592c50 | 770 | if (!p->pack_size) { |
bf592c50 | 771 | if (!S_ISREG(st.st_mode)) |
072db278 | 772 | return error("packfile %s not a regular file", p->pack_name); |
bf592c50 | 773 | p->pack_size = st.st_size; |
9bc879c1 | 774 | } else if (p->pack_size != st.st_size) |
072db278 | 775 | return error("packfile %s size changed", p->pack_name); |
9bc879c1 | 776 | |
2c039da8 JH |
777 | /* We leave these file descriptors open with sliding mmap; |
778 | * there is no point keeping them open across exec(), though. | |
779 | */ | |
780 | fd_flag = fcntl(p->pack_fd, F_GETFD, 0); | |
781 | if (fd_flag < 0) | |
072db278 | 782 | return error("cannot determine file descriptor flags"); |
2c039da8 JH |
783 | fd_flag |= FD_CLOEXEC; |
784 | if (fcntl(p->pack_fd, F_SETFD, fd_flag) == -1) | |
072db278 | 785 | return error("cannot set FD_CLOEXEC"); |
2c039da8 | 786 | |
9bc879c1 | 787 | /* Verify we recognize this pack file format. */ |
e6e2bd62 | 788 | if (read_in_full(p->pack_fd, &hdr, sizeof(hdr)) != sizeof(hdr)) |
072db278 | 789 | return error("file %s is far too short to be a packfile", p->pack_name); |
9bc879c1 | 790 | if (hdr.hdr_signature != htonl(PACK_SIGNATURE)) |
072db278 | 791 | return error("file %s is not a GIT packfile", p->pack_name); |
9bc879c1 | 792 | if (!pack_version_ok(hdr.hdr_version)) |
6e1c2344 RJ |
793 | return error("packfile %s is version %"PRIu32" and not" |
794 | " supported (try upgrading GIT to a newer version)", | |
9bc879c1 SP |
795 | p->pack_name, ntohl(hdr.hdr_version)); |
796 | ||
797 | /* Verify the pack matches its index. */ | |
57059091 | 798 | if (p->num_objects != ntohl(hdr.hdr_entries)) |
6e1c2344 RJ |
799 | return error("packfile %s claims to have %"PRIu32" objects" |
800 | " while index indicates %"PRIu32" objects", | |
57059091 NP |
801 | p->pack_name, ntohl(hdr.hdr_entries), |
802 | p->num_objects); | |
9bc879c1 | 803 | if (lseek(p->pack_fd, p->pack_size - sizeof(sha1), SEEK_SET) == -1) |
072db278 | 804 | return error("end of packfile %s is unavailable", p->pack_name); |
e6e2bd62 | 805 | if (read_in_full(p->pack_fd, sha1, sizeof(sha1)) != sizeof(sha1)) |
072db278 | 806 | return error("packfile %s signature is unavailable", p->pack_name); |
42873078 | 807 | idx_sha1 = ((unsigned char *)p->index_data) + p->index_size - 40; |
9bc879c1 | 808 | if (hashcmp(sha1, idx_sha1)) |
072db278 SP |
809 | return error("packfile %s does not match index", p->pack_name); |
810 | return 0; | |
9bc879c1 SP |
811 | } |
812 | ||
3cf8b462 SP |
813 | static int open_packed_git(struct packed_git *p) |
814 | { | |
815 | if (!open_packed_git_1(p)) | |
816 | return 0; | |
817 | if (p->pack_fd != -1) { | |
818 | close(p->pack_fd); | |
c7934306 | 819 | pack_open_fds--; |
3cf8b462 SP |
820 | p->pack_fd = -1; |
821 | } | |
822 | return -1; | |
823 | } | |
824 | ||
c4001d92 | 825 | static int in_window(struct pack_window *win, off_t offset) |
60bb8b14 SP |
826 | { |
827 | /* We must promise at least 20 bytes (one hash) after the | |
828 | * offset is available from this window, otherwise the offset | |
829 | * is not actually in this window and a different window (which | |
830 | * has that one hash excess) must be used. This is to support | |
831 | * the object header and delta base parsing routines below. | |
832 | */ | |
833 | off_t win_off = win->offset; | |
834 | return win_off <= offset | |
835 | && (offset + 20) <= (win_off + win->len); | |
836 | } | |
837 | ||
4b25d091 | 838 | unsigned char *use_pack(struct packed_git *p, |
03e79c88 | 839 | struct pack_window **w_cursor, |
c4001d92 | 840 | off_t offset, |
ef49a7a0 | 841 | unsigned long *left) |
9bc879c1 | 842 | { |
60bb8b14 | 843 | struct pack_window *win = *w_cursor; |
03e79c88 | 844 | |
a9d98a14 | 845 | /* Since packfiles end in a hash of their content and it's |
60bb8b14 SP |
846 | * pointless to ask for an offset into the middle of that |
847 | * hash, and the in_window function above wouldn't match | |
848 | * don't allow an offset too close to the end of the file. | |
849 | */ | |
d131b7af SP |
850 | if (!p->pack_size && p->pack_fd == -1 && open_packed_git(p)) |
851 | die("packfile %s cannot be accessed", p->pack_name); | |
60bb8b14 SP |
852 | if (offset > (p->pack_size - 20)) |
853 | die("offset beyond end of packfile (truncated pack?)"); | |
854 | ||
855 | if (!win || !in_window(win, offset)) { | |
856 | if (win) | |
857 | win->inuse_cnt--; | |
858 | for (win = p->windows; win; win = win->next) { | |
859 | if (in_window(win, offset)) | |
860 | break; | |
861 | } | |
862 | if (!win) { | |
78a28df9 | 863 | size_t window_align = packed_git_window_size / 2; |
dc49cd76 | 864 | off_t len; |
d131b7af SP |
865 | |
866 | if (p->pack_fd == -1 && open_packed_git(p)) | |
867 | die("packfile %s cannot be accessed", p->pack_name); | |
868 | ||
60bb8b14 | 869 | win = xcalloc(1, sizeof(*win)); |
78a28df9 | 870 | win->offset = (offset / window_align) * window_align; |
dc49cd76 SP |
871 | len = p->pack_size - win->offset; |
872 | if (len > packed_git_window_size) | |
873 | len = packed_git_window_size; | |
874 | win->len = (size_t)len; | |
60bb8b14 | 875 | pack_mapped += win->len; |
11daf39b | 876 | while (packed_git_limit < pack_mapped |
d1efefa4 | 877 | && unuse_one_window(p, p->pack_fd)) |
60bb8b14 | 878 | ; /* nothing */ |
c4712e45 | 879 | win->base = xmmap(NULL, win->len, |
60bb8b14 SP |
880 | PROT_READ, MAP_PRIVATE, |
881 | p->pack_fd, win->offset); | |
882 | if (win->base == MAP_FAILED) | |
73b4e4be SP |
883 | die("packfile %s cannot be mapped: %s", |
884 | p->pack_name, | |
885 | strerror(errno)); | |
d131b7af SP |
886 | if (!win->offset && win->len == p->pack_size |
887 | && !p->do_not_close) { | |
888 | close(p->pack_fd); | |
889 | pack_open_fds--; | |
890 | p->pack_fd = -1; | |
891 | } | |
a53128b6 SP |
892 | pack_mmap_calls++; |
893 | pack_open_windows++; | |
894 | if (pack_mapped > peak_pack_mapped) | |
895 | peak_pack_mapped = pack_mapped; | |
896 | if (pack_open_windows > peak_pack_open_windows) | |
897 | peak_pack_open_windows = pack_open_windows; | |
60bb8b14 SP |
898 | win->next = p->windows; |
899 | p->windows = win; | |
900 | } | |
1f688557 | 901 | } |
03e79c88 SP |
902 | if (win != *w_cursor) { |
903 | win->last_used = pack_used_ctr++; | |
904 | win->inuse_cnt++; | |
905 | *w_cursor = win; | |
906 | } | |
60bb8b14 | 907 | offset -= win->offset; |
03e79c88 | 908 | if (left) |
dc49cd76 | 909 | *left = win->len - xsize_t(offset); |
03e79c88 | 910 | return win->base + offset; |
1f688557 JH |
911 | } |
912 | ||
27d69a46 NP |
913 | static struct packed_git *alloc_packed_git(int extra) |
914 | { | |
915 | struct packed_git *p = xmalloc(sizeof(*p) + extra); | |
916 | memset(p, 0, sizeof(*p)); | |
917 | p->pack_fd = -1; | |
918 | return p; | |
919 | } | |
920 | ||
e0500293 JN |
921 | static void try_to_free_pack_memory(size_t size) |
922 | { | |
923 | release_pack_memory(size, -1); | |
924 | } | |
925 | ||
42873078 | 926 | struct packed_git *add_packed_git(const char *path, int path_len, int local) |
1f688557 | 927 | { |
e0500293 | 928 | static int have_set_try_to_free_routine; |
1f688557 | 929 | struct stat st; |
27d69a46 | 930 | struct packed_git *p = alloc_packed_git(path_len + 2); |
1f688557 | 931 | |
e0500293 JN |
932 | if (!have_set_try_to_free_routine) { |
933 | have_set_try_to_free_routine = 1; | |
934 | set_try_to_free_routine(try_to_free_pack_memory); | |
935 | } | |
936 | ||
42873078 NP |
937 | /* |
938 | * Make sure a corresponding .pack file exists and that | |
939 | * the index looks sane. | |
940 | */ | |
941 | path_len -= strlen(".idx"); | |
27d69a46 NP |
942 | if (path_len < 1) { |
943 | free(p); | |
1f688557 | 944 | return NULL; |
27d69a46 | 945 | } |
42873078 | 946 | memcpy(p->pack_name, path, path_len); |
8d25931d BC |
947 | |
948 | strcpy(p->pack_name + path_len, ".keep"); | |
949 | if (!access(p->pack_name, F_OK)) | |
950 | p->pack_keep = 1; | |
951 | ||
42873078 | 952 | strcpy(p->pack_name + path_len, ".pack"); |
d079837e | 953 | if (stat(p->pack_name, &st) || !S_ISREG(st.st_mode)) { |
42873078 | 954 | free(p); |
1f688557 JH |
955 | return NULL; |
956 | } | |
42873078 | 957 | |
1f688557 JH |
958 | /* ok, it looks sane as far as we can check without |
959 | * actually mapping the pack file. | |
960 | */ | |
1f688557 | 961 | p->pack_size = st.st_size; |
9d835df2 | 962 | p->pack_local = local; |
b867092f | 963 | p->mtime = st.st_mtime; |
42873078 NP |
964 | if (path_len < 40 || get_sha1_hex(path + path_len - 40, p->sha1)) |
965 | hashclr(p->sha1); | |
1f688557 JH |
966 | return p; |
967 | } | |
968 | ||
7b64469a | 969 | struct packed_git *parse_pack_index(unsigned char *sha1, const char *idx_path) |
c508df5e | 970 | { |
42873078 | 971 | const char *path = sha1_pack_name(sha1); |
27d69a46 | 972 | struct packed_git *p = alloc_packed_git(strlen(path) + 1); |
bf592c50 | 973 | |
27d69a46 NP |
974 | strcpy(p->pack_name, path); |
975 | hashcpy(p->sha1, sha1); | |
42873078 NP |
976 | if (check_packed_git_idx(idx_path, p)) { |
977 | free(p); | |
bf592c50 | 978 | return NULL; |
42873078 | 979 | } |
bf592c50 | 980 | |
bf592c50 DB |
981 | return p; |
982 | } | |
983 | ||
984 | void install_packed_git(struct packed_git *pack) | |
985 | { | |
c7934306 SP |
986 | if (pack->pack_fd != -1) |
987 | pack_open_fds++; | |
988 | ||
bf592c50 DB |
989 | pack->next = packed_git; |
990 | packed_git = pack; | |
991 | } | |
992 | ||
9d835df2 | 993 | static void prepare_packed_git_one(char *objdir, int local) |
1f688557 | 994 | { |
9cb18f56 JM |
995 | /* Ensure that this buffer is large enough so that we can |
996 | append "/pack/" without clobbering the stack even if | |
997 | strlen(objdir) were PATH_MAX. */ | |
998 | char path[PATH_MAX + 1 + 4 + 1 + 1]; | |
1f688557 JH |
999 | int len; |
1000 | DIR *dir; | |
1001 | struct dirent *de; | |
1002 | ||
1003 | sprintf(path, "%s/pack", objdir); | |
1004 | len = strlen(path); | |
1005 | dir = opendir(path); | |
b5b16990 | 1006 | if (!dir) { |
26125f6b | 1007 | if (errno != ENOENT) |
bd2afde8 | 1008 | error("unable to open object pack directory: %s: %s", |
26125f6b | 1009 | path, strerror(errno)); |
1f688557 | 1010 | return; |
b5b16990 | 1011 | } |
1f688557 JH |
1012 | path[len++] = '/'; |
1013 | while ((de = readdir(dir)) != NULL) { | |
1014 | int namelen = strlen(de->d_name); | |
1015 | struct packed_git *p; | |
1016 | ||
5bb1cda5 | 1017 | if (!has_extension(de->d_name, ".idx")) |
1f688557 JH |
1018 | continue; |
1019 | ||
9cb18f56 JM |
1020 | if (len + namelen + 1 > sizeof(path)) |
1021 | continue; | |
1022 | ||
54a15a8d | 1023 | /* Don't reopen a pack we already have. */ |
1f688557 | 1024 | strcpy(path + len, de->d_name); |
86f7780c JK |
1025 | for (p = packed_git; p; p = p->next) { |
1026 | if (!memcmp(path, p->pack_name, len + namelen - 4)) | |
1027 | break; | |
1028 | } | |
1029 | if (p) | |
1030 | continue; | |
54a15a8d SP |
1031 | /* See if it really is a valid .idx file with corresponding |
1032 | * .pack file that we can map. | |
1033 | */ | |
9d835df2 | 1034 | p = add_packed_git(path, len + namelen, local); |
1f688557 JH |
1035 | if (!p) |
1036 | continue; | |
625e9421 | 1037 | install_packed_git(p); |
1f688557 | 1038 | } |
5b35bcd5 | 1039 | closedir(dir); |
1f688557 JH |
1040 | } |
1041 | ||
b867092f JH |
1042 | static int sort_pack(const void *a_, const void *b_) |
1043 | { | |
1044 | struct packed_git *a = *((struct packed_git **)a_); | |
1045 | struct packed_git *b = *((struct packed_git **)b_); | |
1046 | int st; | |
1047 | ||
1048 | /* | |
1049 | * Local packs tend to contain objects specific to our | |
1050 | * variant of the project than remote ones. In addition, | |
1051 | * remote ones could be on a network mounted filesystem. | |
1052 | * Favor local ones for these reasons. | |
1053 | */ | |
1054 | st = a->pack_local - b->pack_local; | |
1055 | if (st) | |
1056 | return -st; | |
1057 | ||
1058 | /* | |
1059 | * Younger packs tend to contain more recent objects, | |
1060 | * and more recent objects tend to get accessed more | |
1061 | * often. | |
1062 | */ | |
1063 | if (a->mtime < b->mtime) | |
1064 | return 1; | |
1065 | else if (a->mtime == b->mtime) | |
1066 | return 0; | |
1067 | return -1; | |
1068 | } | |
1069 | ||
1070 | static void rearrange_packed_git(void) | |
1071 | { | |
1072 | struct packed_git **ary, *p; | |
1073 | int i, n; | |
1074 | ||
1075 | for (n = 0, p = packed_git; p; p = p->next) | |
1076 | n++; | |
1077 | if (n < 2) | |
1078 | return; | |
1079 | ||
1080 | /* prepare an array of packed_git for easier sorting */ | |
1081 | ary = xcalloc(n, sizeof(struct packed_git *)); | |
1082 | for (n = 0, p = packed_git; p; p = p->next) | |
1083 | ary[n++] = p; | |
1084 | ||
1085 | qsort(ary, n, sizeof(struct packed_git *), sort_pack); | |
1086 | ||
1087 | /* link them back again */ | |
1088 | for (i = 0; i < n - 1; i++) | |
1089 | ary[i]->next = ary[i + 1]; | |
1090 | ary[n - 1]->next = NULL; | |
1091 | packed_git = ary[0]; | |
1092 | ||
1093 | free(ary); | |
1094 | } | |
1095 | ||
637cdd9d | 1096 | static int prepare_packed_git_run_once = 0; |
9a217f2a | 1097 | void prepare_packed_git(void) |
1f688557 | 1098 | { |
d5a63b99 | 1099 | struct alternate_object_database *alt; |
1f688557 | 1100 | |
637cdd9d | 1101 | if (prepare_packed_git_run_once) |
1f688557 | 1102 | return; |
9d835df2 | 1103 | prepare_packed_git_one(get_object_directory(), 1); |
9a217f2a | 1104 | prepare_alt_odb(); |
d5a63b99 | 1105 | for (alt = alt_odb_list; alt; alt = alt->next) { |
1494e038 | 1106 | alt->name[-1] = 0; |
9d835df2 | 1107 | prepare_packed_git_one(alt->base, 0); |
1494e038 | 1108 | alt->name[-1] = '/'; |
1f688557 | 1109 | } |
b867092f | 1110 | rearrange_packed_git(); |
637cdd9d JK |
1111 | prepare_packed_git_run_once = 1; |
1112 | } | |
1113 | ||
fc04c412 | 1114 | void reprepare_packed_git(void) |
637cdd9d | 1115 | { |
4b480c67 | 1116 | discard_revindex(); |
637cdd9d JK |
1117 | prepare_packed_git_run_once = 0; |
1118 | prepare_packed_git(); | |
1f688557 JH |
1119 | } |
1120 | ||
8eca0b47 NP |
1121 | static void mark_bad_packed_object(struct packed_git *p, |
1122 | const unsigned char *sha1) | |
1123 | { | |
1124 | unsigned i; | |
1125 | for (i = 0; i < p->num_bad_objects; i++) | |
1126 | if (!hashcmp(sha1, p->bad_object_sha1 + 20 * i)) | |
1127 | return; | |
1128 | p->bad_object_sha1 = xrealloc(p->bad_object_sha1, 20 * (p->num_bad_objects + 1)); | |
1129 | hashcpy(p->bad_object_sha1 + 20 * p->num_bad_objects, sha1); | |
1130 | p->num_bad_objects++; | |
1131 | } | |
1132 | ||
b6c4cecc | 1133 | static const struct packed_git *has_packed_and_bad(const unsigned char *sha1) |
ac939109 NP |
1134 | { |
1135 | struct packed_git *p; | |
1136 | unsigned i; | |
1137 | ||
1138 | for (p = packed_git; p; p = p->next) | |
1139 | for (i = 0; i < p->num_bad_objects; i++) | |
1140 | if (!hashcmp(sha1, p->bad_object_sha1 + 20 * i)) | |
b6c4cecc JH |
1141 | return p; |
1142 | return NULL; | |
ac939109 NP |
1143 | } |
1144 | ||
5d6ccf5c | 1145 | int check_sha1_signature(const unsigned char *sha1, void *map, unsigned long size, const char *type) |
0fcfd160 LT |
1146 | { |
1147 | unsigned char real_sha1[20]; | |
7cfb5f36 | 1148 | hash_sha1_file(map, size, type, real_sha1); |
a89fccd2 | 1149 | return hashcmp(sha1, real_sha1) ? -1 : 0; |
0fcfd160 LT |
1150 | } |
1151 | ||
f4e51683 | 1152 | static int git_open_noatime(const char *name) |
44d1c19e LT |
1153 | { |
1154 | static int sha1_file_open_flag = O_NOATIME; | |
44d1c19e | 1155 | |
f2e872aa SP |
1156 | for (;;) { |
1157 | int fd = open(name, O_RDONLY | sha1_file_open_flag); | |
44d1c19e | 1158 | if (fd >= 0) |
f2e872aa SP |
1159 | return fd; |
1160 | ||
f2e872aa SP |
1161 | /* Might the failure be due to O_NOATIME? */ |
1162 | if (errno != ENOENT && sha1_file_open_flag) { | |
44d1c19e | 1163 | sha1_file_open_flag = 0; |
f2e872aa SP |
1164 | continue; |
1165 | } | |
1166 | ||
1167 | return -1; | |
44d1c19e | 1168 | } |
44d1c19e LT |
1169 | } |
1170 | ||
1171 | static int open_sha1_file(const unsigned char *sha1) | |
1172 | { | |
1173 | int fd; | |
1174 | char *name = sha1_file_name(sha1); | |
1175 | struct alternate_object_database *alt; | |
1176 | ||
f4e51683 | 1177 | fd = git_open_noatime(name); |
44d1c19e LT |
1178 | if (fd >= 0) |
1179 | return fd; | |
1180 | ||
1181 | prepare_alt_odb(); | |
1182 | errno = ENOENT; | |
1183 | for (alt = alt_odb_list; alt; alt = alt->next) { | |
1184 | name = alt->name; | |
1185 | fill_sha1_path(name, sha1); | |
f4e51683 | 1186 | fd = git_open_noatime(alt->base); |
44d1c19e LT |
1187 | if (fd >= 0) |
1188 | return fd; | |
1189 | } | |
1190 | return -1; | |
1191 | } | |
1192 | ||
f0270efd | 1193 | void *map_sha1_file(const unsigned char *sha1, unsigned long *size) |
0fcfd160 | 1194 | { |
0fcfd160 | 1195 | void *map; |
144bde78 | 1196 | int fd; |
ace1534d | 1197 | |
44d1c19e LT |
1198 | fd = open_sha1_file(sha1); |
1199 | map = NULL; | |
1200 | if (fd >= 0) { | |
1201 | struct stat st; | |
0fcfd160 | 1202 | |
44d1c19e LT |
1203 | if (!fstat(fd, &st)) { |
1204 | *size = xsize_t(st.st_size); | |
1205 | map = xmmap(NULL, *size, PROT_READ, MAP_PRIVATE, fd, 0); | |
144bde78 | 1206 | } |
44d1c19e | 1207 | close(fd); |
0fcfd160 | 1208 | } |
0fcfd160 LT |
1209 | return map; |
1210 | } | |
1211 | ||
cc5c54e7 JH |
1212 | /* |
1213 | * There used to be a second loose object header format which | |
1214 | * was meant to mimic the in-pack format, allowing for direct | |
1215 | * copy of the object data. This format turned up not to be | |
1216 | * really worth it and we no longer write loose objects in that | |
1217 | * format. | |
1218 | */ | |
1219 | static int experimental_loose_object(unsigned char *map) | |
bb6b8e4f JH |
1220 | { |
1221 | unsigned int word; | |
1222 | ||
1223 | /* | |
7f684a2a RT |
1224 | * We must determine if the buffer contains the standard |
1225 | * zlib-deflated stream or the experimental format based | |
1226 | * on the in-pack object format. Compare the header byte | |
1227 | * for each format: | |
1228 | * | |
1229 | * RFC1950 zlib w/ deflate : 0www1000 : 0 <= www <= 7 | |
1230 | * Experimental pack-based : Stttssss : ttt = 1,2,3,4 | |
1231 | * | |
1232 | * If bit 7 is clear and bits 0-3 equal 8, the buffer MUST be | |
1233 | * in standard loose-object format, UNLESS it is a Git-pack | |
1234 | * format object *exactly* 8 bytes in size when inflated. | |
1235 | * | |
1236 | * However, RFC1950 also specifies that the 1st 16-bit word | |
1237 | * must be divisible by 31 - this checksum tells us our buffer | |
1238 | * is in the standard format, giving a false positive only if | |
1239 | * the 1st word of the Git-pack format object happens to be | |
1240 | * divisible by 31, ie: | |
1241 | * ((byte0 * 256) + byte1) % 31 = 0 | |
1242 | * => 0ttt10000www1000 % 31 = 0 | |
1243 | * | |
1244 | * As it happens, this case can only arise for www=3 & ttt=1 | |
1245 | * - ie, a Commit object, which would have to be 8 bytes in | |
1246 | * size. As no Commit can be that small, we find that the | |
1247 | * combination of these two criteria (bitmask & checksum) | |
1248 | * can always correctly determine the buffer format. | |
bb6b8e4f JH |
1249 | */ |
1250 | word = (map[0] << 8) + map[1]; | |
7f684a2a | 1251 | if ((map[0] & 0x8F) == 0x08 && !(word % 31)) |
bb6b8e4f | 1252 | return 0; |
cc5c54e7 JH |
1253 | else |
1254 | return 1; | |
bb6b8e4f JH |
1255 | } |
1256 | ||
09ded04b NP |
1257 | unsigned long unpack_object_header_buffer(const unsigned char *buf, |
1258 | unsigned long len, enum object_type *type, unsigned long *sizep) | |
c4483576 | 1259 | { |
ad1ed5ee | 1260 | unsigned shift; |
48fb7deb | 1261 | unsigned long size, c; |
ad1ed5ee JH |
1262 | unsigned long used = 0; |
1263 | ||
1264 | c = buf[used++]; | |
1265 | *type = (c >> 4) & 7; | |
1266 | size = c & 15; | |
1267 | shift = 4; | |
1268 | while (c & 0x80) { | |
f630cfda | 1269 | if (len <= used || bitsizeof(long) <= shift) { |
09ded04b | 1270 | error("bad object header"); |
ea4f9685 JH |
1271 | size = used = 0; |
1272 | break; | |
09ded04b | 1273 | } |
ad1ed5ee JH |
1274 | c = buf[used++]; |
1275 | size += (c & 0x7f) << shift; | |
1276 | shift += 7; | |
1277 | } | |
1278 | *sizep = size; | |
1279 | return used; | |
1280 | } | |
1281 | ||
eb4f4076 | 1282 | int unpack_sha1_header(git_zstream *stream, unsigned char *map, unsigned long mapsize, void *buffer, unsigned long bufsiz) |
ad1ed5ee JH |
1283 | { |
1284 | unsigned long size, used; | |
1285 | static const char valid_loose_object_type[8] = { | |
1286 | 0, /* OBJ_EXT */ | |
1287 | 1, 1, 1, 1, /* "commit", "tree", "blob", "tag" */ | |
1288 | 0, /* "delta" and others are invalid in a loose object */ | |
93821bd9 | 1289 | }; |
ad1ed5ee | 1290 | enum object_type type; |
93821bd9 | 1291 | |
c4483576 LT |
1292 | /* Get the data stream */ |
1293 | memset(stream, 0, sizeof(*stream)); | |
1294 | stream->next_in = map; | |
1295 | stream->avail_in = mapsize; | |
1296 | stream->next_out = buffer; | |
93821bd9 LT |
1297 | stream->avail_out = bufsiz; |
1298 | ||
cc5c54e7 JH |
1299 | if (experimental_loose_object(map)) { |
1300 | /* | |
1301 | * The old experimental format we no longer produce; | |
1302 | * we can still read it. | |
1303 | */ | |
1304 | used = unpack_object_header_buffer(map, mapsize, &type, &size); | |
1305 | if (!used || !valid_loose_object_type[type]) | |
1306 | return -1; | |
1307 | map += used; | |
1308 | mapsize -= used; | |
726f852b | 1309 | |
cc5c54e7 JH |
1310 | /* Set up the stream for the rest.. */ |
1311 | stream->next_in = map; | |
1312 | stream->avail_in = mapsize; | |
1313 | git_inflate_init(stream); | |
93821bd9 | 1314 | |
cc5c54e7 JH |
1315 | /* And generate the fake traditional header */ |
1316 | stream->total_out = 1 + snprintf(buffer, bufsiz, "%s %lu", | |
1317 | typename(type), size); | |
1318 | return 0; | |
1319 | } | |
39c68542 | 1320 | git_inflate_init(stream); |
cc5c54e7 | 1321 | return git_inflate(stream, 0); |
c4483576 LT |
1322 | } |
1323 | ||
ef49a7a0 | 1324 | static void *unpack_sha1_rest(git_zstream *stream, void *buffer, unsigned long size, const unsigned char *sha1) |
5180cacc LT |
1325 | { |
1326 | int bytes = strlen(buffer) + 1; | |
3aee68aa | 1327 | unsigned char *buf = xmallocz(size); |
93821bd9 | 1328 | unsigned long n; |
7efbff75 | 1329 | int status = Z_OK; |
5180cacc | 1330 | |
93821bd9 LT |
1331 | n = stream->total_out - bytes; |
1332 | if (n > size) | |
1333 | n = size; | |
1334 | memcpy(buf, (char *) buffer + bytes, n); | |
1335 | bytes = n; | |
456cdf6e LT |
1336 | if (bytes <= size) { |
1337 | /* | |
1338 | * The above condition must be (bytes <= size), not | |
1339 | * (bytes < size). In other words, even though we | |
ccf5ace0 | 1340 | * expect no more output and set avail_out to zero, |
456cdf6e LT |
1341 | * the input zlib stream may have bytes that express |
1342 | * "this concludes the stream", and we *do* want to | |
1343 | * eat that input. | |
1344 | * | |
1345 | * Otherwise we would not be able to test that we | |
1346 | * consumed all the input to reach the expected size; | |
1347 | * we also want to check that zlib tells us that all | |
1348 | * went well with status == Z_STREAM_END at the end. | |
1349 | */ | |
5180cacc LT |
1350 | stream->next_out = buf + bytes; |
1351 | stream->avail_out = size - bytes; | |
7efbff75 | 1352 | while (status == Z_OK) |
39c68542 | 1353 | status = git_inflate(stream, Z_FINISH); |
5180cacc | 1354 | } |
456cdf6e | 1355 | if (status == Z_STREAM_END && !stream->avail_in) { |
39c68542 | 1356 | git_inflate_end(stream); |
7efbff75 JH |
1357 | return buf; |
1358 | } | |
1359 | ||
1360 | if (status < 0) | |
1361 | error("corrupt loose object '%s'", sha1_to_hex(sha1)); | |
1362 | else if (stream->avail_in) | |
1363 | error("garbage at end of loose object '%s'", | |
1364 | sha1_to_hex(sha1)); | |
1365 | free(buf); | |
1366 | return NULL; | |
5180cacc LT |
1367 | } |
1368 | ||
1369 | /* | |
1370 | * We used to just use "sscanf()", but that's actually way | |
1371 | * too permissive for what we want to check. So do an anal | |
1372 | * object header parse by hand. | |
1373 | */ | |
f0270efd | 1374 | int parse_sha1_header(const char *hdr, unsigned long *sizep) |
5180cacc | 1375 | { |
21666f1a | 1376 | char type[10]; |
5180cacc LT |
1377 | int i; |
1378 | unsigned long size; | |
1379 | ||
1380 | /* | |
a6080a0a | 1381 | * The type can be at most ten bytes (including the |
5180cacc | 1382 | * terminating '\0' that we add), and is followed by |
21666f1a | 1383 | * a space. |
5180cacc | 1384 | */ |
21666f1a | 1385 | i = 0; |
5180cacc LT |
1386 | for (;;) { |
1387 | char c = *hdr++; | |
1388 | if (c == ' ') | |
1389 | break; | |
21666f1a NP |
1390 | type[i++] = c; |
1391 | if (i >= sizeof(type)) | |
5180cacc | 1392 | return -1; |
5180cacc | 1393 | } |
21666f1a | 1394 | type[i] = 0; |
5180cacc LT |
1395 | |
1396 | /* | |
1397 | * The length must follow immediately, and be in canonical | |
1398 | * decimal format (ie "010" is not valid). | |
1399 | */ | |
1400 | size = *hdr++ - '0'; | |
1401 | if (size > 9) | |
1402 | return -1; | |
1403 | if (size) { | |
1404 | for (;;) { | |
1405 | unsigned long c = *hdr - '0'; | |
1406 | if (c > 9) | |
1407 | break; | |
1408 | hdr++; | |
1409 | size = size * 10 + c; | |
1410 | } | |
1411 | } | |
1412 | *sizep = size; | |
1413 | ||
1414 | /* | |
1415 | * The length must be followed by a zero byte | |
1416 | */ | |
21666f1a | 1417 | return *hdr ? -1 : type_from_string(type); |
5180cacc LT |
1418 | } |
1419 | ||
7efbff75 | 1420 | static void *unpack_sha1_file(void *map, unsigned long mapsize, enum object_type *type, unsigned long *size, const unsigned char *sha1) |
0fcfd160 | 1421 | { |
5180cacc | 1422 | int ret; |
ef49a7a0 | 1423 | git_zstream stream; |
5180cacc | 1424 | char hdr[8192]; |
0fcfd160 | 1425 | |
5180cacc | 1426 | ret = unpack_sha1_header(&stream, map, mapsize, hdr, sizeof(hdr)); |
21666f1a | 1427 | if (ret < Z_OK || (*type = parse_sha1_header(hdr, size)) < 0) |
0fcfd160 LT |
1428 | return NULL; |
1429 | ||
7efbff75 | 1430 | return unpack_sha1_rest(&stream, hdr, *size, sha1); |
0fcfd160 LT |
1431 | } |
1432 | ||
54dab52a NP |
1433 | unsigned long get_size_from_delta(struct packed_git *p, |
1434 | struct pack_window **w_curs, | |
1435 | off_t curpos) | |
1436 | { | |
1437 | const unsigned char *data; | |
1438 | unsigned char delta_head[20], *in; | |
ef49a7a0 | 1439 | git_zstream stream; |
54dab52a NP |
1440 | int st; |
1441 | ||
1442 | memset(&stream, 0, sizeof(stream)); | |
1443 | stream.next_out = delta_head; | |
1444 | stream.avail_out = sizeof(delta_head); | |
1445 | ||
39c68542 | 1446 | git_inflate_init(&stream); |
54dab52a NP |
1447 | do { |
1448 | in = use_pack(p, w_curs, curpos, &stream.avail_in); | |
1449 | stream.next_in = in; | |
39c68542 | 1450 | st = git_inflate(&stream, Z_FINISH); |
54dab52a NP |
1451 | curpos += stream.next_in - in; |
1452 | } while ((st == Z_OK || st == Z_BUF_ERROR) && | |
1453 | stream.total_out < sizeof(delta_head)); | |
39c68542 | 1454 | git_inflate_end(&stream); |
3d77d877 NP |
1455 | if ((st != Z_STREAM_END) && stream.total_out != sizeof(delta_head)) { |
1456 | error("delta data unpack-initial failed"); | |
1457 | return 0; | |
1458 | } | |
54dab52a NP |
1459 | |
1460 | /* Examine the initial part of the delta to figure out | |
1461 | * the result size. | |
1462 | */ | |
1463 | data = delta_head; | |
1464 | ||
1465 | /* ignore base size */ | |
1466 | get_delta_hdr_size(&data, delta_head+sizeof(delta_head)); | |
1467 | ||
1468 | /* Read the result size */ | |
1469 | return get_delta_hdr_size(&data, delta_head+sizeof(delta_head)); | |
1470 | } | |
1471 | ||
c4001d92 | 1472 | static off_t get_delta_base(struct packed_git *p, |
03e79c88 | 1473 | struct pack_window **w_curs, |
c4001d92 | 1474 | off_t *curpos, |
21666f1a | 1475 | enum object_type type, |
c4001d92 | 1476 | off_t delta_obj_offset) |
eb32d236 | 1477 | { |
2b87c45b | 1478 | unsigned char *base_info = use_pack(p, w_curs, *curpos, NULL); |
c4001d92 | 1479 | off_t base_offset; |
eb32d236 | 1480 | |
8d8a4ea5 SP |
1481 | /* use_pack() assured us we have [base_info, base_info + 20) |
1482 | * as a range that we can look at without walking off the | |
1483 | * end of the mapped window. Its actually the hash size | |
1484 | * that is assured. An OFS_DELTA longer than the hash size | |
1485 | * is stupid, as then a REF_DELTA would be smaller to store. | |
1486 | */ | |
21666f1a | 1487 | if (type == OBJ_OFS_DELTA) { |
eb32d236 NP |
1488 | unsigned used = 0; |
1489 | unsigned char c = base_info[used++]; | |
1490 | base_offset = c & 127; | |
1491 | while (c & 128) { | |
1492 | base_offset += 1; | |
8723f216 | 1493 | if (!base_offset || MSB(base_offset, 7)) |
8eca0b47 | 1494 | return 0; /* overflow */ |
eb32d236 NP |
1495 | c = base_info[used++]; |
1496 | base_offset = (base_offset << 7) + (c & 127); | |
1497 | } | |
1498 | base_offset = delta_obj_offset - base_offset; | |
d8f32556 | 1499 | if (base_offset <= 0 || base_offset >= delta_obj_offset) |
8eca0b47 | 1500 | return 0; /* out of bound */ |
2b87c45b | 1501 | *curpos += used; |
21666f1a | 1502 | } else if (type == OBJ_REF_DELTA) { |
eb32d236 NP |
1503 | /* The base entry _must_ be in the same pack */ |
1504 | base_offset = find_pack_entry_one(base_info, p); | |
2b87c45b | 1505 | *curpos += 20; |
eb32d236 NP |
1506 | } else |
1507 | die("I am totally screwed"); | |
2b87c45b | 1508 | return base_offset; |
eb32d236 NP |
1509 | } |
1510 | ||
f3bf9224 | 1511 | /* forward declaration for a mutually recursive function */ |
c4001d92 | 1512 | static int packed_object_info(struct packed_git *p, off_t offset, |
9a490590 | 1513 | unsigned long *sizep, int *rtype); |
f3bf9224 | 1514 | |
43057304 | 1515 | static int packed_delta_info(struct packed_git *p, |
03e79c88 | 1516 | struct pack_window **w_curs, |
c4001d92 | 1517 | off_t curpos, |
21666f1a | 1518 | enum object_type type, |
c4001d92 | 1519 | off_t obj_offset, |
43057304 | 1520 | unsigned long *sizep) |
5db47c2b | 1521 | { |
c4001d92 | 1522 | off_t base_offset; |
f3bf9224 | 1523 | |
21666f1a | 1524 | base_offset = get_delta_base(p, w_curs, &curpos, type, obj_offset); |
3d77d877 NP |
1525 | if (!base_offset) |
1526 | return OBJ_BAD; | |
9a490590 | 1527 | type = packed_object_info(p, base_offset, NULL, NULL); |
3d77d877 | 1528 | if (type <= OBJ_NONE) { |
08698b1e NP |
1529 | struct revindex_entry *revidx; |
1530 | const unsigned char *base_sha1; | |
1531 | revidx = find_pack_revindex(p, base_offset); | |
1532 | if (!revidx) | |
1533 | return OBJ_BAD; | |
1534 | base_sha1 = nth_packed_object_sha1(p, revidx->nr); | |
3d77d877 NP |
1535 | mark_bad_packed_object(p, base_sha1); |
1536 | type = sha1_object_info(base_sha1, NULL); | |
1537 | if (type <= OBJ_NONE) | |
1538 | return OBJ_BAD; | |
1539 | } | |
f3bf9224 | 1540 | |
c62266f3 JH |
1541 | /* We choose to only get the type of the base object and |
1542 | * ignore potentially corrupt pack file that expects the delta | |
1543 | * based on a base with a wrong size. This saves tons of | |
1544 | * inflate() calls. | |
1545 | */ | |
3d77d877 | 1546 | if (sizep) { |
54dab52a | 1547 | *sizep = get_size_from_delta(p, w_curs, curpos); |
3d77d877 NP |
1548 | if (*sizep == 0) |
1549 | type = OBJ_BAD; | |
1550 | } | |
21666f1a NP |
1551 | |
1552 | return type; | |
5db47c2b JH |
1553 | } |
1554 | ||
f8c8abc5 JH |
1555 | int unpack_object_header(struct packed_git *p, |
1556 | struct pack_window **w_curs, | |
1557 | off_t *curpos, | |
1558 | unsigned long *sizep) | |
a733cb60 | 1559 | { |
03e79c88 | 1560 | unsigned char *base; |
ef49a7a0 | 1561 | unsigned long left; |
ad1ed5ee | 1562 | unsigned long used; |
2b87c45b | 1563 | enum object_type type; |
a733cb60 | 1564 | |
8d8a4ea5 | 1565 | /* use_pack() assures us we have [base, base + 20) available |
0353a0c4 | 1566 | * as a range that we can look at. (Its actually the hash |
3dff5379 | 1567 | * size that is assured.) With our object header encoding |
8d8a4ea5 SP |
1568 | * the maximum deflated object size is 2^137, which is just |
1569 | * insane, so we know won't exceed what we have been given. | |
1570 | */ | |
2b87c45b | 1571 | base = use_pack(p, w_curs, *curpos, &left); |
09ded04b NP |
1572 | used = unpack_object_header_buffer(base, left, &type, sizep); |
1573 | if (!used) { | |
1574 | type = OBJ_BAD; | |
1575 | } else | |
1576 | *curpos += used; | |
ad1ed5ee | 1577 | |
2b87c45b | 1578 | return type; |
a733cb60 LT |
1579 | } |
1580 | ||
c4001d92 | 1581 | static int packed_object_info(struct packed_git *p, off_t obj_offset, |
9a490590 | 1582 | unsigned long *sizep, int *rtype) |
1f688557 | 1583 | { |
03e79c88 | 1584 | struct pack_window *w_curs = NULL; |
c4001d92 SP |
1585 | unsigned long size; |
1586 | off_t curpos = obj_offset; | |
21666f1a | 1587 | enum object_type type; |
5db47c2b | 1588 | |
21666f1a | 1589 | type = unpack_object_header(p, &w_curs, &curpos, &size); |
9a490590 JH |
1590 | if (rtype) |
1591 | *rtype = type; /* representation type */ | |
5db47c2b | 1592 | |
21666f1a | 1593 | switch (type) { |
eb32d236 NP |
1594 | case OBJ_OFS_DELTA: |
1595 | case OBJ_REF_DELTA: | |
21666f1a NP |
1596 | type = packed_delta_info(p, &w_curs, curpos, |
1597 | type, obj_offset, sizep); | |
2b87c45b | 1598 | break; |
a733cb60 | 1599 | case OBJ_COMMIT: |
a733cb60 | 1600 | case OBJ_TREE: |
a733cb60 | 1601 | case OBJ_BLOB: |
a733cb60 | 1602 | case OBJ_TAG: |
2b87c45b NP |
1603 | if (sizep) |
1604 | *sizep = size; | |
a69d0943 | 1605 | break; |
1f688557 | 1606 | default: |
3d77d877 NP |
1607 | error("unknown object type %i at offset %"PRIuMAX" in %s", |
1608 | type, (uintmax_t)obj_offset, p->pack_name); | |
1609 | type = OBJ_BAD; | |
1f688557 | 1610 | } |
2b87c45b | 1611 | unuse_pack(&w_curs); |
21666f1a | 1612 | return type; |
1f688557 JH |
1613 | } |
1614 | ||
eb950c19 | 1615 | static void *unpack_compressed_entry(struct packed_git *p, |
03e79c88 | 1616 | struct pack_window **w_curs, |
c4001d92 | 1617 | off_t curpos, |
eb950c19 | 1618 | unsigned long size) |
de530aaa SP |
1619 | { |
1620 | int st; | |
ef49a7a0 | 1621 | git_zstream stream; |
079afb18 | 1622 | unsigned char *buffer, *in; |
de530aaa | 1623 | |
4ab07e4d | 1624 | buffer = xmallocz(size); |
de530aaa | 1625 | memset(&stream, 0, sizeof(stream)); |
de530aaa | 1626 | stream.next_out = buffer; |
39eea7bd | 1627 | stream.avail_out = size + 1; |
de530aaa | 1628 | |
39c68542 | 1629 | git_inflate_init(&stream); |
079afb18 | 1630 | do { |
2b87c45b | 1631 | in = use_pack(p, w_curs, curpos, &stream.avail_in); |
079afb18 | 1632 | stream.next_in = in; |
39c68542 | 1633 | st = git_inflate(&stream, Z_FINISH); |
39eea7bd JH |
1634 | if (!stream.avail_out) |
1635 | break; /* the payload is larger than it should be */ | |
2b87c45b | 1636 | curpos += stream.next_in - in; |
079afb18 | 1637 | } while (st == Z_OK || st == Z_BUF_ERROR); |
39c68542 | 1638 | git_inflate_end(&stream); |
de530aaa SP |
1639 | if ((st != Z_STREAM_END) || stream.total_out != size) { |
1640 | free(buffer); | |
1641 | return NULL; | |
1642 | } | |
1643 | ||
1644 | return buffer; | |
1645 | } | |
1646 | ||
e5e01619 LT |
1647 | #define MAX_DELTA_CACHE (256) |
1648 | ||
18bdec11 | 1649 | static size_t delta_base_cached; |
5e08ecbf NP |
1650 | |
1651 | static struct delta_base_cache_lru_list { | |
1652 | struct delta_base_cache_lru_list *prev; | |
1653 | struct delta_base_cache_lru_list *next; | |
1654 | } delta_base_cache_lru = { &delta_base_cache_lru, &delta_base_cache_lru }; | |
1655 | ||
e5e01619 | 1656 | static struct delta_base_cache_entry { |
5e08ecbf NP |
1657 | struct delta_base_cache_lru_list lru; |
1658 | void *data; | |
e5e01619 LT |
1659 | struct packed_git *p; |
1660 | off_t base_offset; | |
1661 | unsigned long size; | |
e5e01619 LT |
1662 | enum object_type type; |
1663 | } delta_base_cache[MAX_DELTA_CACHE]; | |
1664 | ||
1665 | static unsigned long pack_entry_hash(struct packed_git *p, off_t base_offset) | |
1666 | { | |
1667 | unsigned long hash; | |
1668 | ||
1669 | hash = (unsigned long)p + (unsigned long)base_offset; | |
1670 | hash += (hash >> 8) + (hash >> 16); | |
3358004a | 1671 | return hash % MAX_DELTA_CACHE; |
e5e01619 LT |
1672 | } |
1673 | ||
5266d369 JH |
1674 | static int in_delta_base_cache(struct packed_git *p, off_t base_offset) |
1675 | { | |
1676 | unsigned long hash = pack_entry_hash(p, base_offset); | |
1677 | struct delta_base_cache_entry *ent = delta_base_cache + hash; | |
1678 | return (ent->data && ent->p == p && ent->base_offset == base_offset); | |
1679 | } | |
1680 | ||
62f255ad | 1681 | static void *cache_or_unpack_entry(struct packed_git *p, off_t base_offset, |
a0cba108 | 1682 | unsigned long *base_size, enum object_type *type, int keep_cache) |
62f255ad | 1683 | { |
e5e01619 LT |
1684 | void *ret; |
1685 | unsigned long hash = pack_entry_hash(p, base_offset); | |
1686 | struct delta_base_cache_entry *ent = delta_base_cache + hash; | |
1687 | ||
1688 | ret = ent->data; | |
749bc58c MV |
1689 | if (!ret || ent->p != p || ent->base_offset != base_offset) |
1690 | return unpack_entry(p, base_offset, type, base_size); | |
e5e01619 | 1691 | |
18bdec11 | 1692 | if (!keep_cache) { |
a0cba108 | 1693 | ent->data = NULL; |
5e08ecbf NP |
1694 | ent->lru.next->prev = ent->lru.prev; |
1695 | ent->lru.prev->next = ent->lru.next; | |
18bdec11 | 1696 | delta_base_cached -= ent->size; |
182af834 PH |
1697 | } else { |
1698 | ret = xmemdupz(ent->data, ent->size); | |
a0cba108 | 1699 | } |
e5e01619 LT |
1700 | *type = ent->type; |
1701 | *base_size = ent->size; | |
1702 | return ret; | |
62f255ad LT |
1703 | } |
1704 | ||
18bdec11 SP |
1705 | static inline void release_delta_base_cache(struct delta_base_cache_entry *ent) |
1706 | { | |
1707 | if (ent->data) { | |
1708 | free(ent->data); | |
1709 | ent->data = NULL; | |
5e08ecbf NP |
1710 | ent->lru.next->prev = ent->lru.prev; |
1711 | ent->lru.prev->next = ent->lru.next; | |
18bdec11 SP |
1712 | delta_base_cached -= ent->size; |
1713 | } | |
1714 | } | |
1715 | ||
3d20c636 SP |
1716 | void clear_delta_base_cache(void) |
1717 | { | |
1718 | unsigned long p; | |
1719 | for (p = 0; p < MAX_DELTA_CACHE; p++) | |
1720 | release_delta_base_cache(&delta_base_cache[p]); | |
1721 | } | |
1722 | ||
62f255ad LT |
1723 | static void add_delta_base_cache(struct packed_git *p, off_t base_offset, |
1724 | void *base, unsigned long base_size, enum object_type type) | |
1725 | { | |
5e08ecbf | 1726 | unsigned long hash = pack_entry_hash(p, base_offset); |
e5e01619 | 1727 | struct delta_base_cache_entry *ent = delta_base_cache + hash; |
5e08ecbf | 1728 | struct delta_base_cache_lru_list *lru; |
e5e01619 | 1729 | |
18bdec11 SP |
1730 | release_delta_base_cache(ent); |
1731 | delta_base_cached += base_size; | |
5e08ecbf NP |
1732 | |
1733 | for (lru = delta_base_cache_lru.next; | |
1734 | delta_base_cached > delta_base_cache_limit | |
1735 | && lru != &delta_base_cache_lru; | |
1736 | lru = lru->next) { | |
1737 | struct delta_base_cache_entry *f = (void *)lru; | |
18bdec11 SP |
1738 | if (f->type == OBJ_BLOB) |
1739 | release_delta_base_cache(f); | |
1740 | } | |
5e08ecbf NP |
1741 | for (lru = delta_base_cache_lru.next; |
1742 | delta_base_cached > delta_base_cache_limit | |
1743 | && lru != &delta_base_cache_lru; | |
1744 | lru = lru->next) { | |
1745 | struct delta_base_cache_entry *f = (void *)lru; | |
1746 | release_delta_base_cache(f); | |
1747 | } | |
18bdec11 | 1748 | |
e5e01619 LT |
1749 | ent->p = p; |
1750 | ent->base_offset = base_offset; | |
1751 | ent->type = type; | |
1752 | ent->data = base; | |
1753 | ent->size = base_size; | |
5e08ecbf NP |
1754 | ent->lru.next = &delta_base_cache_lru; |
1755 | ent->lru.prev = delta_base_cache_lru.prev; | |
1756 | delta_base_cache_lru.prev->next = &ent->lru; | |
1757 | delta_base_cache_lru.prev = &ent->lru; | |
62f255ad LT |
1758 | } |
1759 | ||
c2c5b270 CC |
1760 | static void *read_object(const unsigned char *sha1, enum object_type *type, |
1761 | unsigned long *size); | |
1762 | ||
eb950c19 | 1763 | static void *unpack_delta_entry(struct packed_git *p, |
03e79c88 | 1764 | struct pack_window **w_curs, |
c4001d92 | 1765 | off_t curpos, |
1f688557 | 1766 | unsigned long delta_size, |
c4001d92 | 1767 | off_t obj_offset, |
21666f1a | 1768 | enum object_type *type, |
eb950c19 | 1769 | unsigned long *sizep) |
1f688557 | 1770 | { |
7c3e8be3 | 1771 | void *delta_data, *result, *base; |
c4001d92 SP |
1772 | unsigned long base_size; |
1773 | off_t base_offset; | |
43057304 | 1774 | |
21666f1a | 1775 | base_offset = get_delta_base(p, w_curs, &curpos, *type, obj_offset); |
8eca0b47 NP |
1776 | if (!base_offset) { |
1777 | error("failed to validate delta base reference " | |
1778 | "at offset %"PRIuMAX" from %s", | |
1779 | (uintmax_t)curpos, p->pack_name); | |
1780 | return NULL; | |
1781 | } | |
eac12e2d | 1782 | unuse_pack(w_curs); |
a0cba108 | 1783 | base = cache_or_unpack_entry(p, base_offset, &base_size, type, 0); |
8eca0b47 NP |
1784 | if (!base) { |
1785 | /* | |
1786 | * We're probably in deep shit, but let's try to fetch | |
1787 | * the required base anyway from another pack or loose. | |
1788 | * This is costly but should happen only in the presence | |
1789 | * of a corrupted pack, and is better than failing outright. | |
1790 | */ | |
08698b1e NP |
1791 | struct revindex_entry *revidx; |
1792 | const unsigned char *base_sha1; | |
1793 | revidx = find_pack_revindex(p, base_offset); | |
1794 | if (!revidx) | |
1795 | return NULL; | |
1796 | base_sha1 = nth_packed_object_sha1(p, revidx->nr); | |
8eca0b47 NP |
1797 | error("failed to read delta base object %s" |
1798 | " at offset %"PRIuMAX" from %s", | |
1799 | sha1_to_hex(base_sha1), (uintmax_t)base_offset, | |
1800 | p->pack_name); | |
1801 | mark_bad_packed_object(p, base_sha1); | |
ac939109 | 1802 | base = read_object(base_sha1, type, &base_size); |
8eca0b47 NP |
1803 | if (!base) |
1804 | return NULL; | |
1805 | } | |
67686d95 | 1806 | |
2b87c45b | 1807 | delta_data = unpack_compressed_entry(p, w_curs, curpos, delta_size); |
8eca0b47 NP |
1808 | if (!delta_data) { |
1809 | error("failed to unpack compressed delta " | |
1810 | "at offset %"PRIuMAX" from %s", | |
1811 | (uintmax_t)curpos, p->pack_name); | |
1812 | free(base); | |
1813 | return NULL; | |
1814 | } | |
1f688557 JH |
1815 | result = patch_delta(base, base_size, |
1816 | delta_data, delta_size, | |
21666f1a | 1817 | sizep); |
1f688557 JH |
1818 | if (!result) |
1819 | die("failed to apply delta"); | |
1820 | free(delta_data); | |
62f255ad | 1821 | add_delta_base_cache(p, base_offset, base, base_size, *type); |
1f688557 JH |
1822 | return result; |
1823 | } | |
1824 | ||
5f44324d JH |
1825 | static void write_pack_access_log(struct packed_git *p, off_t obj_offset) |
1826 | { | |
1827 | static FILE *log_file; | |
1828 | ||
1829 | if (!log_file) { | |
1830 | log_file = fopen(log_pack_access, "w"); | |
1831 | if (!log_file) { | |
1832 | error("cannot open pack access log '%s' for writing: %s", | |
1833 | log_pack_access, strerror(errno)); | |
1834 | log_pack_access = NULL; | |
1835 | return; | |
1836 | } | |
1837 | } | |
1838 | fprintf(log_file, "%s %"PRIuMAX"\n", | |
1839 | p->pack_name, (uintmax_t)obj_offset); | |
1840 | fflush(log_file); | |
1841 | } | |
1842 | ||
0e8189e2 NP |
1843 | int do_check_packed_object_crc; |
1844 | ||
c4001d92 | 1845 | void *unpack_entry(struct packed_git *p, off_t obj_offset, |
21666f1a | 1846 | enum object_type *type, unsigned long *sizep) |
1f688557 | 1847 | { |
03e79c88 | 1848 | struct pack_window *w_curs = NULL; |
c4001d92 | 1849 | off_t curpos = obj_offset; |
21666f1a | 1850 | void *data; |
1f688557 | 1851 | |
5f44324d JH |
1852 | if (log_pack_access) |
1853 | write_pack_access_log(p, obj_offset); | |
1854 | ||
0e8189e2 NP |
1855 | if (do_check_packed_object_crc && p->index_version > 1) { |
1856 | struct revindex_entry *revidx = find_pack_revindex(p, obj_offset); | |
1857 | unsigned long len = revidx[1].offset - obj_offset; | |
1858 | if (check_pack_crc(p, &w_curs, obj_offset, len, revidx->nr)) { | |
1859 | const unsigned char *sha1 = | |
1860 | nth_packed_object_sha1(p, revidx->nr); | |
1861 | error("bad packed object CRC for %s", | |
1862 | sha1_to_hex(sha1)); | |
1863 | mark_bad_packed_object(p, sha1); | |
f755bb99 | 1864 | unuse_pack(&w_curs); |
0e8189e2 NP |
1865 | return NULL; |
1866 | } | |
1867 | } | |
1868 | ||
21666f1a NP |
1869 | *type = unpack_object_header(p, &w_curs, &curpos, sizep); |
1870 | switch (*type) { | |
eb32d236 NP |
1871 | case OBJ_OFS_DELTA: |
1872 | case OBJ_REF_DELTA: | |
21666f1a NP |
1873 | data = unpack_delta_entry(p, &w_curs, curpos, *sizep, |
1874 | obj_offset, type, sizep); | |
4d703a1a | 1875 | break; |
a733cb60 | 1876 | case OBJ_COMMIT: |
a733cb60 | 1877 | case OBJ_TREE: |
a733cb60 | 1878 | case OBJ_BLOB: |
a733cb60 | 1879 | case OBJ_TAG: |
21666f1a | 1880 | data = unpack_compressed_entry(p, &w_curs, curpos, *sizep); |
4d703a1a | 1881 | break; |
1f688557 | 1882 | default: |
8eca0b47 NP |
1883 | data = NULL; |
1884 | error("unknown object type %i at offset %"PRIuMAX" in %s", | |
1885 | *type, (uintmax_t)obj_offset, p->pack_name); | |
1f688557 | 1886 | } |
03e79c88 | 1887 | unuse_pack(&w_curs); |
21666f1a | 1888 | return data; |
1f688557 JH |
1889 | } |
1890 | ||
d079837e | 1891 | const unsigned char *nth_packed_object_sha1(struct packed_git *p, |
d72308e0 | 1892 | uint32_t n) |
9a217f2a | 1893 | { |
42873078 | 1894 | const unsigned char *index = p->index_data; |
d079837e SP |
1895 | if (!index) { |
1896 | if (open_pack_index(p)) | |
1897 | return NULL; | |
1898 | index = p->index_data; | |
1899 | } | |
57059091 | 1900 | if (n >= p->num_objects) |
d72308e0 | 1901 | return NULL; |
74e34e1f NP |
1902 | index += 4 * 256; |
1903 | if (p->index_version == 1) { | |
1904 | return index + 24 * n + 4; | |
1905 | } else { | |
1906 | index += 8; | |
1907 | return index + 20 * n; | |
1908 | } | |
1909 | } | |
1910 | ||
99093238 | 1911 | off_t nth_packed_object_offset(const struct packed_git *p, uint32_t n) |
74e34e1f NP |
1912 | { |
1913 | const unsigned char *index = p->index_data; | |
1914 | index += 4 * 256; | |
1915 | if (p->index_version == 1) { | |
1916 | return ntohl(*((uint32_t *)(index + 24 * n))); | |
1917 | } else { | |
1918 | uint32_t off; | |
1919 | index += 8 + p->num_objects * (20 + 4); | |
1920 | off = ntohl(*((uint32_t *)(index + 4 * n))); | |
1921 | if (!(off & 0x80000000)) | |
1922 | return off; | |
1923 | index += p->num_objects * 4 + (off & 0x7fffffff) * 8; | |
1924 | return (((uint64_t)ntohl(*((uint32_t *)(index + 0)))) << 32) | | |
1925 | ntohl(*((uint32_t *)(index + 4))); | |
1926 | } | |
9a217f2a JH |
1927 | } |
1928 | ||
c4001d92 | 1929 | off_t find_pack_entry_one(const unsigned char *sha1, |
43057304 | 1930 | struct packed_git *p) |
1f688557 | 1931 | { |
42873078 | 1932 | const uint32_t *level1_ofs = p->index_data; |
42873078 | 1933 | const unsigned char *index = p->index_data; |
628522ec JH |
1934 | unsigned hi, lo, stride; |
1935 | static int use_lookup = -1; | |
1936 | static int debug_lookup = -1; | |
1937 | ||
1938 | if (debug_lookup < 0) | |
1939 | debug_lookup = !!getenv("GIT_DEBUG_LOOKUP"); | |
42873078 | 1940 | |
d079837e SP |
1941 | if (!index) { |
1942 | if (open_pack_index(p)) | |
1943 | return 0; | |
1944 | level1_ofs = p->index_data; | |
1945 | index = p->index_data; | |
1946 | } | |
74e34e1f NP |
1947 | if (p->index_version > 1) { |
1948 | level1_ofs += 2; | |
1949 | index += 8; | |
1950 | } | |
42873078 | 1951 | index += 4 * 256; |
74e34e1f NP |
1952 | hi = ntohl(level1_ofs[*sha1]); |
1953 | lo = ((*sha1 == 0x0) ? 0 : ntohl(level1_ofs[*sha1 - 1])); | |
628522ec JH |
1954 | if (p->index_version > 1) { |
1955 | stride = 20; | |
1956 | } else { | |
1957 | stride = 24; | |
1958 | index += 4; | |
1959 | } | |
1960 | ||
1961 | if (debug_lookup) | |
6e1c2344 | 1962 | printf("%02x%02x%02x... lo %u hi %u nr %"PRIu32"\n", |
628522ec JH |
1963 | sha1[0], sha1[1], sha1[2], lo, hi, p->num_objects); |
1964 | ||
1965 | if (use_lookup < 0) | |
1966 | use_lookup = !!getenv("GIT_USE_LOOKUP"); | |
1967 | if (use_lookup) { | |
1968 | int pos = sha1_entry_pos(index, stride, 0, | |
1969 | lo, hi, p->num_objects, sha1); | |
1970 | if (pos < 0) | |
1971 | return 0; | |
1972 | return nth_packed_object_offset(p, pos); | |
1973 | } | |
1f688557 JH |
1974 | |
1975 | do { | |
74e34e1f | 1976 | unsigned mi = (lo + hi) / 2; |
628522ec JH |
1977 | int cmp = hashcmp(index + mi * stride, sha1); |
1978 | ||
1979 | if (debug_lookup) | |
1980 | printf("lo %u hi %u rg %u mi %u\n", | |
1981 | lo, hi, hi - lo, mi); | |
43057304 | 1982 | if (!cmp) |
74e34e1f | 1983 | return nth_packed_object_offset(p, mi); |
1f688557 JH |
1984 | if (cmp > 0) |
1985 | hi = mi; | |
1986 | else | |
1987 | lo = mi+1; | |
1988 | } while (lo < hi); | |
1989 | return 0; | |
1990 | } | |
1991 | ||
4c080182 | 1992 | int is_pack_valid(struct packed_git *p) |
d131b7af SP |
1993 | { |
1994 | /* An already open pack is known to be valid. */ | |
1995 | if (p->pack_fd != -1) | |
1996 | return 1; | |
1997 | ||
1998 | /* If the pack has one window completely covering the | |
1999 | * file size, the pack is known to be valid even if | |
2000 | * the descriptor is not currently open. | |
2001 | */ | |
2002 | if (p->windows) { | |
2003 | struct pack_window *w = p->windows; | |
2004 | ||
2005 | if (!w->offset && w->len == p->pack_size) | |
2006 | return 1; | |
2007 | } | |
2008 | ||
2009 | /* Force the pack to open to prove its valid. */ | |
2010 | return !open_packed_git(p); | |
2011 | } | |
2012 | ||
4d6acb70 | 2013 | static int find_pack_entry(const unsigned char *sha1, struct pack_entry *e) |
1f688557 | 2014 | { |
f7c22cc6 | 2015 | static struct packed_git *last_found = (void *)1; |
1f688557 | 2016 | struct packed_git *p; |
c4001d92 | 2017 | off_t offset; |
43057304 | 2018 | |
1f688557 | 2019 | prepare_packed_git(); |
f7c22cc6 NP |
2020 | if (!packed_git) |
2021 | return 0; | |
2022 | p = (last_found == (void *)1) ? packed_git : last_found; | |
1f688557 | 2023 | |
f7c22cc6 | 2024 | do { |
8eca0b47 NP |
2025 | if (p->num_bad_objects) { |
2026 | unsigned i; | |
2027 | for (i = 0; i < p->num_bad_objects; i++) | |
2028 | if (!hashcmp(sha1, p->bad_object_sha1 + 20 * i)) | |
2029 | goto next; | |
2030 | } | |
2031 | ||
43057304 NP |
2032 | offset = find_pack_entry_one(sha1, p); |
2033 | if (offset) { | |
c715f783 SP |
2034 | /* |
2035 | * We are about to tell the caller where they can | |
2036 | * locate the requested object. We better make | |
2037 | * sure the packfile is still here and can be | |
2038 | * accessed before supplying that answer, as | |
2039 | * it may have been deleted since the index | |
2040 | * was loaded! | |
2041 | */ | |
d131b7af | 2042 | if (!is_pack_valid(p)) { |
58a6a9cc | 2043 | warning("packfile %s cannot be accessed", p->pack_name); |
f7c22cc6 | 2044 | goto next; |
c715f783 | 2045 | } |
43057304 NP |
2046 | e->offset = offset; |
2047 | e->p = p; | |
2048 | hashcpy(e->sha1, sha1); | |
f7c22cc6 | 2049 | last_found = p; |
1f688557 | 2050 | return 1; |
43057304 | 2051 | } |
f7c22cc6 NP |
2052 | |
2053 | next: | |
2054 | if (p == last_found) | |
2055 | p = packed_git; | |
2056 | else | |
2057 | p = p->next; | |
2058 | if (p == last_found) | |
2059 | p = p->next; | |
2060 | } while (p); | |
1f688557 JH |
2061 | return 0; |
2062 | } | |
2063 | ||
a6080a0a | 2064 | struct packed_git *find_sha1_pack(const unsigned char *sha1, |
bf592c50 DB |
2065 | struct packed_git *packs) |
2066 | { | |
2067 | struct packed_git *p; | |
bf592c50 DB |
2068 | |
2069 | for (p = packs; p; p = p->next) { | |
43057304 | 2070 | if (find_pack_entry_one(sha1, p)) |
bf592c50 DB |
2071 | return p; |
2072 | } | |
2073 | return NULL; | |
21666f1a | 2074 | |
bf592c50 DB |
2075 | } |
2076 | ||
21666f1a | 2077 | static int sha1_loose_object_info(const unsigned char *sha1, unsigned long *sizep) |
65c2e0c3 | 2078 | { |
36e4d74a | 2079 | int status; |
65c2e0c3 JH |
2080 | unsigned long mapsize, size; |
2081 | void *map; | |
ef49a7a0 | 2082 | git_zstream stream; |
d65a16f6 | 2083 | char hdr[32]; |
65c2e0c3 | 2084 | |
bb6b8e4f | 2085 | map = map_sha1_file(sha1, &mapsize); |
f0df4ed5 JS |
2086 | if (!map) |
2087 | return error("unable to find %s", sha1_to_hex(sha1)); | |
36e4d74a JH |
2088 | if (unpack_sha1_header(&stream, map, mapsize, hdr, sizeof(hdr)) < 0) |
2089 | status = error("unable to unpack %s header", | |
2090 | sha1_to_hex(sha1)); | |
21666f1a | 2091 | else if ((status = parse_sha1_header(hdr, &size)) < 0) |
36e4d74a | 2092 | status = error("unable to parse %s header", sha1_to_hex(sha1)); |
21666f1a NP |
2093 | else if (sizep) |
2094 | *sizep = size; | |
39c68542 | 2095 | git_inflate_end(&stream); |
65c2e0c3 JH |
2096 | munmap(map, mapsize); |
2097 | return status; | |
2098 | } | |
2099 | ||
9a490590 JH |
2100 | /* returns enum object_type or negative */ |
2101 | int sha1_object_info_extended(const unsigned char *sha1, struct object_info *oi) | |
f0df4ed5 | 2102 | { |
c4d9986f | 2103 | struct cached_object *co; |
f0df4ed5 | 2104 | struct pack_entry e; |
9a490590 | 2105 | int status, rtype; |
f0df4ed5 | 2106 | |
c4d9986f NTND |
2107 | co = find_cached_object(sha1); |
2108 | if (co) { | |
9a490590 JH |
2109 | if (oi->sizep) |
2110 | *(oi->sizep) = co->size; | |
2111 | oi->whence = OI_CACHED; | |
c4d9986f NTND |
2112 | return co->type; |
2113 | } | |
2114 | ||
cd673c1f | 2115 | if (!find_pack_entry(sha1, &e)) { |
ddd63e64 | 2116 | /* Most likely it's a loose object. */ |
9a490590 JH |
2117 | status = sha1_loose_object_info(sha1, oi->sizep); |
2118 | if (status >= 0) { | |
2119 | oi->whence = OI_LOOSE; | |
ddd63e64 | 2120 | return status; |
9a490590 | 2121 | } |
ddd63e64 SG |
2122 | |
2123 | /* Not a loose object; someone else may have just packed it. */ | |
f0df4ed5 | 2124 | reprepare_packed_git(); |
cd673c1f | 2125 | if (!find_pack_entry(sha1, &e)) |
ddd63e64 | 2126 | return status; |
f0df4ed5 | 2127 | } |
3d77d877 | 2128 | |
9a490590 | 2129 | status = packed_object_info(e.p, e.offset, oi->sizep, &rtype); |
3d77d877 NP |
2130 | if (status < 0) { |
2131 | mark_bad_packed_object(e.p, sha1); | |
9a490590 | 2132 | status = sha1_object_info_extended(sha1, oi); |
5266d369 JH |
2133 | } else if (in_delta_base_cache(e.p, e.offset)) { |
2134 | oi->whence = OI_DBCACHED; | |
9a490590 JH |
2135 | } else { |
2136 | oi->whence = OI_PACKED; | |
2137 | oi->u.packed.offset = e.offset; | |
2138 | oi->u.packed.pack = e.p; | |
2139 | oi->u.packed.is_delta = (rtype == OBJ_REF_DELTA || | |
2140 | rtype == OBJ_OFS_DELTA); | |
3d77d877 NP |
2141 | } |
2142 | ||
2143 | return status; | |
f0df4ed5 JS |
2144 | } |
2145 | ||
9a490590 JH |
2146 | int sha1_object_info(const unsigned char *sha1, unsigned long *sizep) |
2147 | { | |
2148 | struct object_info oi; | |
2149 | ||
2150 | oi.sizep = sizep; | |
2151 | return sha1_object_info_extended(sha1, &oi); | |
2152 | } | |
2153 | ||
21666f1a NP |
2154 | static void *read_packed_sha1(const unsigned char *sha1, |
2155 | enum object_type *type, unsigned long *size) | |
1f688557 JH |
2156 | { |
2157 | struct pack_entry e; | |
8eca0b47 | 2158 | void *data; |
1f688557 | 2159 | |
cd673c1f | 2160 | if (!find_pack_entry(sha1, &e)) |
1f688557 | 2161 | return NULL; |
8eca0b47 NP |
2162 | data = cache_or_unpack_entry(e.p, e.offset, size, type, 1); |
2163 | if (!data) { | |
2164 | /* | |
2165 | * We're probably in deep shit, but let's try to fetch | |
2166 | * the required object anyway from another pack or loose. | |
2167 | * This should happen only in the presence of a corrupted | |
2168 | * pack, and is better than failing outright. | |
2169 | */ | |
2170 | error("failed to read object %s at offset %"PRIuMAX" from %s", | |
2171 | sha1_to_hex(sha1), (uintmax_t)e.offset, e.p->pack_name); | |
2172 | mark_bad_packed_object(e.p, sha1); | |
ac939109 | 2173 | data = read_object(sha1, type, size); |
8eca0b47 NP |
2174 | } |
2175 | return data; | |
1f688557 JH |
2176 | } |
2177 | ||
21666f1a NP |
2178 | int pretend_sha1_file(void *buf, unsigned long len, enum object_type type, |
2179 | unsigned char *sha1) | |
d66b37bb JH |
2180 | { |
2181 | struct cached_object *co; | |
2182 | ||
21666f1a | 2183 | hash_sha1_file(buf, len, typename(type), sha1); |
d66b37bb JH |
2184 | if (has_sha1_file(sha1) || find_cached_object(sha1)) |
2185 | return 0; | |
2186 | if (cached_object_alloc <= cached_object_nr) { | |
2187 | cached_object_alloc = alloc_nr(cached_object_alloc); | |
2188 | cached_objects = xrealloc(cached_objects, | |
2189 | sizeof(*cached_objects) * | |
2190 | cached_object_alloc); | |
2191 | } | |
2192 | co = &cached_objects[cached_object_nr++]; | |
2193 | co->size = len; | |
21666f1a | 2194 | co->type = type; |
efa13f7b JH |
2195 | co->buf = xmalloc(len); |
2196 | memcpy(co->buf, buf, len); | |
d66b37bb JH |
2197 | hashcpy(co->sha1, sha1); |
2198 | return 0; | |
2199 | } | |
2200 | ||
c2c5b270 CC |
2201 | static void *read_object(const unsigned char *sha1, enum object_type *type, |
2202 | unsigned long *size) | |
0fcfd160 LT |
2203 | { |
2204 | unsigned long mapsize; | |
2205 | void *map, *buf; | |
d66b37bb JH |
2206 | struct cached_object *co; |
2207 | ||
2208 | co = find_cached_object(sha1); | |
2209 | if (co) { | |
21666f1a | 2210 | *type = co->type; |
d66b37bb | 2211 | *size = co->size; |
182af834 | 2212 | return xmemdupz(co->buf, co->size); |
d66b37bb | 2213 | } |
0fcfd160 | 2214 | |
8276c007 PE |
2215 | buf = read_packed_sha1(sha1, type, size); |
2216 | if (buf) | |
2217 | return buf; | |
bb6b8e4f | 2218 | map = map_sha1_file(sha1, &mapsize); |
0fcfd160 | 2219 | if (map) { |
7efbff75 | 2220 | buf = unpack_sha1_file(map, mapsize, type, size, sha1); |
0fcfd160 LT |
2221 | munmap(map, mapsize); |
2222 | return buf; | |
2223 | } | |
637cdd9d | 2224 | reprepare_packed_git(); |
8276c007 | 2225 | return read_packed_sha1(sha1, type, size); |
0fcfd160 LT |
2226 | } |
2227 | ||
b6c4cecc JH |
2228 | /* |
2229 | * This function dies on corrupt objects; the callers who want to | |
2230 | * deal with them should arrange to call read_object() and give error | |
2231 | * messages themselves. | |
2232 | */ | |
5bf29b95 JH |
2233 | void *read_sha1_file_extended(const unsigned char *sha1, |
2234 | enum object_type *type, | |
2235 | unsigned long *size, | |
2236 | unsigned flag) | |
ac939109 | 2237 | { |
3ba7a065 | 2238 | void *data; |
e8b15e61 | 2239 | char *path; |
b6c4cecc | 2240 | const struct packed_git *p; |
5bf29b95 JH |
2241 | const unsigned char *repl = (flag & READ_SHA1_FILE_REPLACE) |
2242 | ? lookup_replace_object(sha1) : sha1; | |
b6c4cecc | 2243 | |
3ba7a065 JH |
2244 | errno = 0; |
2245 | data = read_object(repl, type, size); | |
4bbf5a26 | 2246 | if (data) |
b6c4cecc | 2247 | return data; |
68095570 | 2248 | |
25f3af3f | 2249 | if (errno && errno != ENOENT) |
3ba7a065 JH |
2250 | die_errno("failed to read object %s", sha1_to_hex(sha1)); |
2251 | ||
68095570 | 2252 | /* die if we replaced an object with one that does not exist */ |
b6c4cecc | 2253 | if (repl != sha1) |
68095570 CC |
2254 | die("replacement %s not found for %s", |
2255 | sha1_to_hex(repl), sha1_to_hex(sha1)); | |
2256 | ||
b6c4cecc JH |
2257 | if (has_loose_object(repl)) { |
2258 | path = sha1_file_name(sha1); | |
2259 | die("loose object %s (stored in %s) is corrupt", | |
2260 | sha1_to_hex(repl), path); | |
e8b15e61 | 2261 | } |
68095570 | 2262 | |
b6c4cecc JH |
2263 | if ((p = has_packed_and_bad(repl)) != NULL) |
2264 | die("packed object %s (stored in %s) is corrupt", | |
2265 | sha1_to_hex(repl), p->pack_name); | |
f5552aee | 2266 | |
b6c4cecc | 2267 | return NULL; |
ac939109 NP |
2268 | } |
2269 | ||
40469ee9 | 2270 | void *read_object_with_reference(const unsigned char *sha1, |
21666f1a | 2271 | const char *required_type_name, |
40469ee9 JH |
2272 | unsigned long *size, |
2273 | unsigned char *actual_sha1_return) | |
f4913f91 | 2274 | { |
21666f1a | 2275 | enum object_type type, required_type; |
f4913f91 JH |
2276 | void *buffer; |
2277 | unsigned long isize; | |
40469ee9 | 2278 | unsigned char actual_sha1[20]; |
f4913f91 | 2279 | |
21666f1a | 2280 | required_type = type_from_string(required_type_name); |
e702496e | 2281 | hashcpy(actual_sha1, sha1); |
40469ee9 JH |
2282 | while (1) { |
2283 | int ref_length = -1; | |
2284 | const char *ref_type = NULL; | |
f4913f91 | 2285 | |
21666f1a | 2286 | buffer = read_sha1_file(actual_sha1, &type, &isize); |
40469ee9 JH |
2287 | if (!buffer) |
2288 | return NULL; | |
21666f1a | 2289 | if (type == required_type) { |
40469ee9 JH |
2290 | *size = isize; |
2291 | if (actual_sha1_return) | |
e702496e | 2292 | hashcpy(actual_sha1_return, actual_sha1); |
40469ee9 JH |
2293 | return buffer; |
2294 | } | |
2295 | /* Handle references */ | |
21666f1a | 2296 | else if (type == OBJ_COMMIT) |
40469ee9 | 2297 | ref_type = "tree "; |
21666f1a | 2298 | else if (type == OBJ_TAG) |
40469ee9 JH |
2299 | ref_type = "object "; |
2300 | else { | |
2301 | free(buffer); | |
2302 | return NULL; | |
2303 | } | |
2304 | ref_length = strlen(ref_type); | |
f4913f91 | 2305 | |
50974ec9 MK |
2306 | if (ref_length + 40 > isize || |
2307 | memcmp(buffer, ref_type, ref_length) || | |
1d7f171c | 2308 | get_sha1_hex((char *) buffer + ref_length, actual_sha1)) { |
40469ee9 JH |
2309 | free(buffer); |
2310 | return NULL; | |
2311 | } | |
1cf58e72 | 2312 | free(buffer); |
40469ee9 JH |
2313 | /* Now we have the ID of the referred-to object in |
2314 | * actual_sha1. Check again. */ | |
f4913f91 | 2315 | } |
f4913f91 JH |
2316 | } |
2317 | ||
ce9fbf16 | 2318 | static void write_sha1_file_prepare(const void *buf, unsigned long len, |
972a9155 | 2319 | const char *type, unsigned char *sha1, |
d65a16f6 | 2320 | char *hdr, int *hdrlen) |
d410c0f5 | 2321 | { |
9126f009 | 2322 | git_SHA_CTX c; |
d410c0f5 JH |
2323 | |
2324 | /* Generate the header */ | |
d65a16f6 | 2325 | *hdrlen = sprintf(hdr, "%s %lu", type, len)+1; |
d410c0f5 JH |
2326 | |
2327 | /* Sha1.. */ | |
9126f009 NP |
2328 | git_SHA1_Init(&c); |
2329 | git_SHA1_Update(&c, hdr, *hdrlen); | |
2330 | git_SHA1_Update(&c, buf, len); | |
2331 | git_SHA1_Final(sha1, &c); | |
d410c0f5 JH |
2332 | } |
2333 | ||
230f1322 | 2334 | /* |
5a688fe4 JH |
2335 | * Move the just written object into its final resting place. |
2336 | * NEEDSWORK: this should be renamed to finalize_temp_file() as | |
2337 | * "moving" is only a part of what it does, when no patch between | |
2338 | * master to pu changes the call sites of this function. | |
230f1322 | 2339 | */ |
839837b9 | 2340 | int move_temp_to_file(const char *tmpfile, const char *filename) |
230f1322 | 2341 | { |
e32c0a9c | 2342 | int ret = 0; |
5a688fe4 | 2343 | |
348df166 | 2344 | if (object_creation_mode == OBJECT_CREATION_USES_RENAMES) |
be66a6c4 JS |
2345 | goto try_rename; |
2346 | else if (link(tmpfile, filename)) | |
e32c0a9c | 2347 | ret = errno; |
7ebb6fca LT |
2348 | |
2349 | /* | |
2350 | * Coda hack - coda doesn't like cross-directory links, | |
2351 | * so we fall back to a rename, which will mean that it | |
2352 | * won't be able to check collisions, but that's not a | |
2353 | * big deal. | |
2354 | * | |
2355 | * The same holds for FAT formatted media. | |
2356 | * | |
3be1f18e | 2357 | * When this succeeds, we just return. We have nothing |
7ebb6fca LT |
2358 | * left to unlink. |
2359 | */ | |
2360 | if (ret && ret != EEXIST) { | |
be66a6c4 | 2361 | try_rename: |
7ebb6fca | 2362 | if (!rename(tmpfile, filename)) |
3be1f18e | 2363 | goto out; |
9e48b389 | 2364 | ret = errno; |
230f1322 | 2365 | } |
691f1a28 | 2366 | unlink_or_warn(tmpfile); |
230f1322 LT |
2367 | if (ret) { |
2368 | if (ret != EEXIST) { | |
916d081b | 2369 | return error("unable to write sha1 filename %s: %s\n", filename, strerror(ret)); |
230f1322 LT |
2370 | } |
2371 | /* FIXME!!! Collision check here ? */ | |
2372 | } | |
2373 | ||
3be1f18e | 2374 | out: |
5256b006 | 2375 | if (adjust_shared_perm(filename)) |
5a688fe4 | 2376 | return error("unable to set permission to '%s'", filename); |
230f1322 LT |
2377 | return 0; |
2378 | } | |
2379 | ||
4d548150 LT |
2380 | static int write_buffer(int fd, const void *buf, size_t len) |
2381 | { | |
d34cf19b | 2382 | if (write_in_full(fd, buf, len) < 0) |
93822c22 | 2383 | return error("file write error (%s)", strerror(errno)); |
4d548150 LT |
2384 | return 0; |
2385 | } | |
2386 | ||
ce9fbf16 | 2387 | int hash_sha1_file(const void *buf, unsigned long len, const char *type, |
abdc3fc8 RS |
2388 | unsigned char *sha1) |
2389 | { | |
d65a16f6 | 2390 | char hdr[32]; |
abdc3fc8 RS |
2391 | int hdrlen; |
2392 | write_sha1_file_prepare(buf, len, type, sha1, hdr, &hdrlen); | |
2393 | return 0; | |
2394 | } | |
2395 | ||
e9039dd3 LT |
2396 | /* Finalize a file on disk, and close it. */ |
2397 | static void close_sha1_file(int fd) | |
2398 | { | |
aafe9fba LT |
2399 | if (fsync_object_files) |
2400 | fsync_or_die(fd, "sha1 file"); | |
e9039dd3 | 2401 | if (close(fd) != 0) |
d824cbba | 2402 | die_errno("error when closing sha1 file"); |
e9039dd3 LT |
2403 | } |
2404 | ||
5723fe7e LT |
2405 | /* Size of directory component, including the ending '/' */ |
2406 | static inline int directory_size(const char *filename) | |
2407 | { | |
2408 | const char *s = strrchr(filename, '/'); | |
2409 | if (!s) | |
2410 | return 0; | |
2411 | return s - filename + 1; | |
2412 | } | |
2413 | ||
2414 | /* | |
2415 | * This creates a temporary file in the same directory as the final | |
2416 | * 'filename' | |
2417 | * | |
2418 | * We want to avoid cross-directory filename renames, because those | |
2419 | * can have problems on various filesystems (FAT, NFS, Coda). | |
2420 | */ | |
2421 | static int create_tmpfile(char *buffer, size_t bufsiz, const char *filename) | |
2422 | { | |
2423 | int fd, dirlen = directory_size(filename); | |
2424 | ||
2425 | if (dirlen + 20 > bufsiz) { | |
2426 | errno = ENAMETOOLONG; | |
2427 | return -1; | |
2428 | } | |
2429 | memcpy(buffer, filename, dirlen); | |
2430 | strcpy(buffer + dirlen, "tmp_obj_XXXXXX"); | |
5256b006 | 2431 | fd = git_mkstemp_mode(buffer, 0444); |
cbacbf4e | 2432 | if (fd < 0 && dirlen && errno == ENOENT) { |
5723fe7e | 2433 | /* Make sure the directory exists */ |
6ff6af62 | 2434 | memcpy(buffer, filename, dirlen); |
5723fe7e | 2435 | buffer[dirlen-1] = 0; |
3bfaf018 | 2436 | if (mkdir(buffer, 0777) || adjust_shared_perm(buffer)) |
5723fe7e LT |
2437 | return -1; |
2438 | ||
2439 | /* Try again */ | |
2440 | strcpy(buffer + dirlen - 1, "/tmp_obj_XXXXXX"); | |
5256b006 | 2441 | fd = git_mkstemp_mode(buffer, 0444); |
5723fe7e LT |
2442 | } |
2443 | return fd; | |
2444 | } | |
2445 | ||
bbac7311 | 2446 | static int write_loose_object(const unsigned char *sha1, char *hdr, int hdrlen, |
c00e657d | 2447 | const void *buf, unsigned long len, time_t mtime) |
0fcfd160 | 2448 | { |
915308b1 | 2449 | int fd, ret; |
9892beba | 2450 | unsigned char compressed[4096]; |
ef49a7a0 | 2451 | git_zstream stream; |
748af44c NP |
2452 | git_SHA_CTX c; |
2453 | unsigned char parano_sha1[20]; | |
706bc531 | 2454 | char *filename; |
ab1900a3 | 2455 | static char tmp_file[PATH_MAX]; |
a44c9a5e | 2456 | |
972a9155 | 2457 | filename = sha1_file_name(sha1); |
ab1900a3 | 2458 | fd = create_tmpfile(tmp_file, sizeof(tmp_file), filename); |
aac17941 | 2459 | if (fd < 0) { |
35243577 | 2460 | if (errno == EACCES) |
916d081b PB |
2461 | return error("insufficient permission for adding an object to repository database %s\n", get_object_directory()); |
2462 | else | |
ab1900a3 | 2463 | return error("unable to create temporary sha1 filename %s: %s\n", tmp_file, strerror(errno)); |
aac17941 LT |
2464 | } |
2465 | ||
0fcfd160 LT |
2466 | /* Set it up */ |
2467 | memset(&stream, 0, sizeof(stream)); | |
55bb5c91 | 2468 | git_deflate_init(&stream, zlib_compression_level); |
0fcfd160 | 2469 | stream.next_out = compressed; |
9892beba | 2470 | stream.avail_out = sizeof(compressed); |
748af44c | 2471 | git_SHA1_Init(&c); |
a44c9a5e LT |
2472 | |
2473 | /* First header.. */ | |
d65a16f6 | 2474 | stream.next_in = (unsigned char *)hdr; |
a44c9a5e | 2475 | stream.avail_in = hdrlen; |
55bb5c91 JH |
2476 | while (git_deflate(&stream, 0) == Z_OK) |
2477 | ; /* nothing */ | |
748af44c | 2478 | git_SHA1_Update(&c, hdr, hdrlen); |
a44c9a5e LT |
2479 | |
2480 | /* Then the data itself.. */ | |
c00e657d | 2481 | stream.next_in = (void *)buf; |
a44c9a5e | 2482 | stream.avail_in = len; |
9892beba | 2483 | do { |
748af44c | 2484 | unsigned char *in0 = stream.next_in; |
55bb5c91 | 2485 | ret = git_deflate(&stream, Z_FINISH); |
748af44c | 2486 | git_SHA1_Update(&c, in0, stream.next_in - in0); |
9892beba NP |
2487 | if (write_buffer(fd, compressed, stream.next_out - compressed) < 0) |
2488 | die("unable to write sha1 file"); | |
2489 | stream.next_out = compressed; | |
2490 | stream.avail_out = sizeof(compressed); | |
2491 | } while (ret == Z_OK); | |
2492 | ||
ac54c277 LT |
2493 | if (ret != Z_STREAM_END) |
2494 | die("unable to deflate new object %s (%d)", sha1_to_hex(sha1), ret); | |
55bb5c91 | 2495 | ret = git_deflate_end_gently(&stream); |
ac54c277 LT |
2496 | if (ret != Z_OK) |
2497 | die("deflateEnd on object %s failed (%d)", sha1_to_hex(sha1), ret); | |
748af44c NP |
2498 | git_SHA1_Final(parano_sha1, &c); |
2499 | if (hashcmp(sha1, parano_sha1) != 0) | |
2500 | die("confused by unstable object source data for %s", sha1_to_hex(sha1)); | |
ac54c277 | 2501 | |
e9039dd3 | 2502 | close_sha1_file(fd); |
0fcfd160 | 2503 | |
bbac7311 NP |
2504 | if (mtime) { |
2505 | struct utimbuf utb; | |
2506 | utb.actime = mtime; | |
2507 | utb.modtime = mtime; | |
ab1900a3 | 2508 | if (utime(tmp_file, &utb) < 0) |
bbac7311 | 2509 | warning("failed utime() on %s: %s", |
ab1900a3 | 2510 | tmp_file, strerror(errno)); |
bbac7311 NP |
2511 | } |
2512 | ||
ab1900a3 | 2513 | return move_temp_to_file(tmp_file, filename); |
0fcfd160 | 2514 | } |
8237b185 | 2515 | |
c00e657d | 2516 | int write_sha1_file(const void *buf, unsigned long len, const char *type, unsigned char *returnsha1) |
bbac7311 NP |
2517 | { |
2518 | unsigned char sha1[20]; | |
2519 | char hdr[32]; | |
2520 | int hdrlen; | |
2521 | ||
2522 | /* Normally if we have it in the pack then we do not bother writing | |
2523 | * it out into .git/objects/??/?{38} file. | |
2524 | */ | |
2525 | write_sha1_file_prepare(buf, len, type, sha1, hdr, &hdrlen); | |
2526 | if (returnsha1) | |
2527 | hashcpy(returnsha1, sha1); | |
2528 | if (has_sha1_file(sha1)) | |
2529 | return 0; | |
2530 | return write_loose_object(sha1, hdr, hdrlen, buf, len, 0); | |
2531 | } | |
2532 | ||
2533 | int force_object_loose(const unsigned char *sha1, time_t mtime) | |
2534 | { | |
bbac7311 NP |
2535 | void *buf; |
2536 | unsigned long len; | |
2537 | enum object_type type; | |
2538 | char hdr[32]; | |
2539 | int hdrlen; | |
1fb23e65 | 2540 | int ret; |
bbac7311 | 2541 | |
c529d75a | 2542 | if (has_loose_object(sha1)) |
bbac7311 NP |
2543 | return 0; |
2544 | buf = read_packed_sha1(sha1, &type, &len); | |
2545 | if (!buf) | |
2546 | return error("cannot read sha1_file for %s", sha1_to_hex(sha1)); | |
2547 | hdrlen = sprintf(hdr, "%s %lu", typename(type), len) + 1; | |
1fb23e65 BS |
2548 | ret = write_loose_object(sha1, hdr, hdrlen, buf, len, mtime); |
2549 | free(buf); | |
2550 | ||
2551 | return ret; | |
bbac7311 NP |
2552 | } |
2553 | ||
bf592c50 DB |
2554 | int has_pack_index(const unsigned char *sha1) |
2555 | { | |
2556 | struct stat st; | |
2557 | if (stat(sha1_pack_index_name(sha1), &st)) | |
2558 | return 0; | |
2559 | return 1; | |
bf592c50 DB |
2560 | } |
2561 | ||
cd673c1f JH |
2562 | int has_sha1_pack(const unsigned char *sha1) |
2563 | { | |
2564 | struct pack_entry e; | |
2565 | return find_pack_entry(sha1, &e); | |
2566 | } | |
2567 | ||
8237b185 DB |
2568 | int has_sha1_file(const unsigned char *sha1) |
2569 | { | |
1f688557 JH |
2570 | struct pack_entry e; |
2571 | ||
cd673c1f | 2572 | if (find_pack_entry(sha1, &e)) |
1f688557 | 2573 | return 1; |
c529d75a | 2574 | return has_loose_object(sha1); |
8237b185 | 2575 | } |
74400e71 | 2576 | |
c879daa2 NTND |
2577 | static void check_tree(const void *buf, size_t size) |
2578 | { | |
2579 | struct tree_desc desc; | |
2580 | struct name_entry entry; | |
2581 | ||
2582 | init_tree_desc(&desc, buf, size); | |
2583 | while (tree_entry(&desc, &entry)) | |
2584 | /* do nothing | |
2585 | * tree_entry() will die() on malformed entries */ | |
2586 | ; | |
2587 | } | |
2588 | ||
2589 | static void check_commit(const void *buf, size_t size) | |
2590 | { | |
2591 | struct commit c; | |
2592 | memset(&c, 0, sizeof(c)); | |
2593 | if (parse_commit_buffer(&c, buf, size)) | |
2594 | die("corrupt commit"); | |
2595 | } | |
2596 | ||
2597 | static void check_tag(const void *buf, size_t size) | |
2598 | { | |
2599 | struct tag t; | |
2600 | memset(&t, 0, sizeof(t)); | |
2601 | if (parse_tag_buffer(&t, buf, size)) | |
2602 | die("corrupt tag"); | |
2603 | } | |
2604 | ||
43df4f86 | 2605 | static int index_mem(unsigned char *sha1, void *buf, size_t size, |
c4ce46fc JH |
2606 | enum object_type type, |
2607 | const char *path, unsigned flags) | |
e7332f96 | 2608 | { |
6c510bee | 2609 | int ret, re_allocated = 0; |
c4ce46fc | 2610 | int write_object = flags & HASH_WRITE_OBJECT; |
74400e71 | 2611 | |
7672db20 | 2612 | if (!type) |
edaec3fb | 2613 | type = OBJ_BLOB; |
6c510bee LT |
2614 | |
2615 | /* | |
2616 | * Convert blobs to git internal format | |
2617 | */ | |
43df4f86 | 2618 | if ((type == OBJ_BLOB) && path) { |
f285a2d7 | 2619 | struct strbuf nbuf = STRBUF_INIT; |
21e5ad50 | 2620 | if (convert_to_git(path, buf, size, &nbuf, |
5e12e78e | 2621 | write_object ? safe_crlf : SAFE_CRLF_FALSE)) { |
b315c5c0 | 2622 | buf = strbuf_detach(&nbuf, &size); |
6c510bee LT |
2623 | re_allocated = 1; |
2624 | } | |
2625 | } | |
c4ce46fc | 2626 | if (flags & HASH_FORMAT_CHECK) { |
c879daa2 NTND |
2627 | if (type == OBJ_TREE) |
2628 | check_tree(buf, size); | |
2629 | if (type == OBJ_COMMIT) | |
2630 | check_commit(buf, size); | |
2631 | if (type == OBJ_TAG) | |
2632 | check_tag(buf, size); | |
2633 | } | |
6c510bee | 2634 | |
7672db20 | 2635 | if (write_object) |
edaec3fb | 2636 | ret = write_sha1_file(buf, size, typename(type), sha1); |
abdc3fc8 | 2637 | else |
edaec3fb | 2638 | ret = hash_sha1_file(buf, size, typename(type), sha1); |
43df4f86 | 2639 | if (re_allocated) |
6c510bee | 2640 | free(buf); |
43df4f86 DP |
2641 | return ret; |
2642 | } | |
2643 | ||
7b41e1e1 JH |
2644 | static int index_pipe(unsigned char *sha1, int fd, enum object_type type, |
2645 | const char *path, unsigned flags) | |
2646 | { | |
2647 | struct strbuf sbuf = STRBUF_INIT; | |
2648 | int ret; | |
2649 | ||
2650 | if (strbuf_read(&sbuf, fd, 4096) >= 0) | |
2651 | ret = index_mem(sha1, sbuf.buf, sbuf.len, type, path, flags); | |
2652 | else | |
2653 | ret = -1; | |
2654 | strbuf_release(&sbuf); | |
2655 | return ret; | |
2656 | } | |
2657 | ||
ea68b0ce DP |
2658 | #define SMALL_FILE_SIZE (32*1024) |
2659 | ||
7b41e1e1 JH |
2660 | static int index_core(unsigned char *sha1, int fd, size_t size, |
2661 | enum object_type type, const char *path, | |
2662 | unsigned flags) | |
43df4f86 DP |
2663 | { |
2664 | int ret; | |
43df4f86 | 2665 | |
7b41e1e1 | 2666 | if (!size) { |
c4ce46fc | 2667 | ret = index_mem(sha1, NULL, size, type, path, flags); |
ea68b0ce DP |
2668 | } else if (size <= SMALL_FILE_SIZE) { |
2669 | char *buf = xmalloc(size); | |
2670 | if (size == read_in_full(fd, buf, size)) | |
c4ce46fc | 2671 | ret = index_mem(sha1, buf, size, type, path, flags); |
ea68b0ce DP |
2672 | else |
2673 | ret = error("short read %s", strerror(errno)); | |
2674 | free(buf); | |
08bda208 | 2675 | } else { |
43df4f86 | 2676 | void *buf = xmmap(NULL, size, PROT_READ, MAP_PRIVATE, fd, 0); |
c4ce46fc | 2677 | ret = index_mem(sha1, buf, size, type, path, flags); |
aac17941 | 2678 | munmap(buf, size); |
08bda208 | 2679 | } |
7b41e1e1 JH |
2680 | return ret; |
2681 | } | |
2682 | ||
4dd1fbc7 | 2683 | /* |
568508e7 JH |
2684 | * This creates one packfile per large blob unless bulk-checkin |
2685 | * machinery is "plugged". | |
4dd1fbc7 JH |
2686 | * |
2687 | * This also bypasses the usual "convert-to-git" dance, and that is on | |
2688 | * purpose. We could write a streaming version of the converting | |
2689 | * functions and insert that before feeding the data to fast-import | |
2690 | * (or equivalent in-core API described above), but the primary | |
2691 | * motivation for trying to stream from the working tree file and to | |
2692 | * avoid mmaping it in core is to deal with large binary blobs, and | |
2693 | * by definition they do _not_ want to get any conversion. | |
2694 | */ | |
2695 | static int index_stream(unsigned char *sha1, int fd, size_t size, | |
2696 | enum object_type type, const char *path, | |
2697 | unsigned flags) | |
2698 | { | |
568508e7 | 2699 | return index_bulk_checkin(sha1, fd, size, type, path, flags); |
4dd1fbc7 JH |
2700 | } |
2701 | ||
7b41e1e1 JH |
2702 | int index_fd(unsigned char *sha1, int fd, struct stat *st, |
2703 | enum object_type type, const char *path, unsigned flags) | |
2704 | { | |
2705 | int ret; | |
2706 | size_t size = xsize_t(st->st_size); | |
2707 | ||
2708 | if (!S_ISREG(st->st_mode)) | |
2709 | ret = index_pipe(sha1, fd, type, path, flags); | |
4dd1fbc7 | 2710 | else if (size <= big_file_threshold || type != OBJ_BLOB) |
7b41e1e1 | 2711 | ret = index_core(sha1, fd, size, type, path, flags); |
4dd1fbc7 JH |
2712 | else |
2713 | ret = index_stream(sha1, fd, size, type, path, flags); | |
43df4f86 | 2714 | close(fd); |
aac17941 | 2715 | return ret; |
74400e71 | 2716 | } |
ec1fcc16 | 2717 | |
c4ce46fc | 2718 | int index_path(unsigned char *sha1, const char *path, struct stat *st, unsigned flags) |
ec1fcc16 JH |
2719 | { |
2720 | int fd; | |
b760d3aa | 2721 | struct strbuf sb = STRBUF_INIT; |
ec1fcc16 JH |
2722 | |
2723 | switch (st->st_mode & S_IFMT) { | |
2724 | case S_IFREG: | |
2725 | fd = open(path, O_RDONLY); | |
2726 | if (fd < 0) | |
2727 | return error("open(\"%s\"): %s", path, | |
2728 | strerror(errno)); | |
c4ce46fc | 2729 | if (index_fd(sha1, fd, st, OBJ_BLOB, path, flags) < 0) |
ec1fcc16 JH |
2730 | return error("%s: failed to insert into database", |
2731 | path); | |
2732 | break; | |
2733 | case S_IFLNK: | |
b760d3aa | 2734 | if (strbuf_readlink(&sb, path, st->st_size)) { |
ec1fcc16 | 2735 | char *errstr = strerror(errno); |
ec1fcc16 JH |
2736 | return error("readlink(\"%s\"): %s", path, |
2737 | errstr); | |
2738 | } | |
c4ce46fc | 2739 | if (!(flags & HASH_WRITE_OBJECT)) |
b760d3aa LT |
2740 | hash_sha1_file(sb.buf, sb.len, blob_type, sha1); |
2741 | else if (write_sha1_file(sb.buf, sb.len, blob_type, sha1)) | |
ec1fcc16 JH |
2742 | return error("%s: failed to insert into database", |
2743 | path); | |
b760d3aa | 2744 | strbuf_release(&sb); |
ec1fcc16 | 2745 | break; |
f35a6d3b LT |
2746 | case S_IFDIR: |
2747 | return resolve_gitlink_ref(path, "HEAD", sha1); | |
ec1fcc16 JH |
2748 | default: |
2749 | return error("%s: unsupported file type", path); | |
2750 | } | |
2751 | return 0; | |
2752 | } | |
a69e5429 JH |
2753 | |
2754 | int read_pack_header(int fd, struct pack_header *header) | |
2755 | { | |
c697ad14 HO |
2756 | if (read_in_full(fd, header, sizeof(*header)) < sizeof(*header)) |
2757 | /* "eof before pack header was fully read" */ | |
2758 | return PH_ERROR_EOF; | |
2759 | ||
a69e5429 JH |
2760 | if (header->hdr_signature != htonl(PACK_SIGNATURE)) |
2761 | /* "protocol error (pack signature mismatch detected)" */ | |
2762 | return PH_ERROR_PACK_SIGNATURE; | |
2763 | if (!pack_version_ok(header->hdr_version)) | |
2764 | /* "protocol error (pack version unsupported)" */ | |
2765 | return PH_ERROR_PROTOCOL; | |
2766 | return 0; | |
2767 | } | |
40d52ff7 JK |
2768 | |
2769 | void assert_sha1_type(const unsigned char *sha1, enum object_type expect) | |
2770 | { | |
2771 | enum object_type type = sha1_object_info(sha1, NULL); | |
2772 | if (type < 0) | |
2773 | die("%s is not a valid object", sha1_to_hex(sha1)); | |
2774 | if (type != expect) | |
2775 | die("%s is not a valid '%s' object", sha1_to_hex(sha1), | |
2776 | typename(expect)); | |
2777 | } |