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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" |
6eac50d8 | 10 | #include "string-list.h" |
1f688557 | 11 | #include "delta.h" |
a733cb60 | 12 | #include "pack.h" |
8e440259 PE |
13 | #include "blob.h" |
14 | #include "commit.h" | |
4dd1fbc7 | 15 | #include "run-command.h" |
8e440259 PE |
16 | #include "tag.h" |
17 | #include "tree.h" | |
c879daa2 | 18 | #include "tree-walk.h" |
f35a6d3b | 19 | #include "refs.h" |
70f5d5d3 | 20 | #include "pack-revindex.h" |
628522ec | 21 | #include "sha1-lookup.h" |
568508e7 | 22 | #include "bulk-checkin.h" |
090ea126 | 23 | #include "streaming.h" |
0fcfd160 | 24 | |
144bde78 LT |
25 | #ifndef O_NOATIME |
26 | #if defined(__linux__) && (defined(__i386__) || defined(__PPC__)) | |
27 | #define O_NOATIME 01000000 | |
28 | #else | |
29 | #define O_NOATIME 0 | |
30 | #endif | |
31 | #endif | |
32 | ||
28bd70d8 JN |
33 | #define SZ_FMT PRIuMAX |
34 | static inline uintmax_t sz_fmt(size_t s) { return s; } | |
e05db0fd | 35 | |
96f1e58f | 36 | const unsigned char null_sha1[20]; |
88cd621d | 37 | |
c597ba80 NTND |
38 | /* |
39 | * This is meant to hold a *small* number of objects that you would | |
40 | * want read_sha1_file() to be able to return, but yet you do not want | |
41 | * to write them into the object store (e.g. a browse-only | |
42 | * application). | |
43 | */ | |
44 | static struct cached_object { | |
45 | unsigned char sha1[20]; | |
46 | enum object_type type; | |
47 | void *buf; | |
48 | unsigned long size; | |
49 | } *cached_objects; | |
50 | static int cached_object_nr, cached_object_alloc; | |
51 | ||
52 | static struct cached_object empty_tree = { | |
dab0d410 | 53 | EMPTY_TREE_SHA1_BIN_LITERAL, |
c597ba80 NTND |
54 | OBJ_TREE, |
55 | "", | |
56 | 0 | |
57 | }; | |
58 | ||
c01f51cc NTND |
59 | static struct packed_git *last_found_pack; |
60 | ||
c597ba80 NTND |
61 | static struct cached_object *find_cached_object(const unsigned char *sha1) |
62 | { | |
63 | int i; | |
64 | struct cached_object *co = cached_objects; | |
65 | ||
66 | for (i = 0; i < cached_object_nr; i++, co++) { | |
67 | if (!hashcmp(co->sha1, sha1)) | |
68 | return co; | |
69 | } | |
70 | if (!hashcmp(sha1, empty_tree.sha1)) | |
71 | return &empty_tree; | |
72 | return NULL; | |
73 | } | |
74 | ||
90a6464b JH |
75 | int mkdir_in_gitdir(const char *path) |
76 | { | |
77 | if (mkdir(path, 0777)) { | |
78 | int saved_errno = errno; | |
79 | struct stat st; | |
80 | struct strbuf sb = STRBUF_INIT; | |
81 | ||
82 | if (errno != EEXIST) | |
83 | return -1; | |
84 | /* | |
85 | * Are we looking at a path in a symlinked worktree | |
86 | * whose original repository does not yet have it? | |
87 | * e.g. .git/rr-cache pointing at its original | |
88 | * repository in which the user hasn't performed any | |
89 | * conflict resolution yet? | |
90 | */ | |
91 | if (lstat(path, &st) || !S_ISLNK(st.st_mode) || | |
92 | strbuf_readlink(&sb, path, st.st_size) || | |
93 | !is_absolute_path(sb.buf) || | |
94 | mkdir(sb.buf, 0777)) { | |
95 | strbuf_release(&sb); | |
96 | errno = saved_errno; | |
97 | return -1; | |
98 | } | |
99 | strbuf_release(&sb); | |
100 | } | |
101 | return adjust_shared_perm(path); | |
102 | } | |
103 | ||
b2cb9425 JH |
104 | int safe_create_leading_directories(char *path) |
105 | { | |
8385abfd | 106 | char *pos = path + offset_1st_component(path); |
67d42212 JR |
107 | struct stat st; |
108 | ||
b2cb9425 JH |
109 | while (pos) { |
110 | pos = strchr(pos, '/'); | |
111 | if (!pos) | |
112 | break; | |
5f0bdf50 JH |
113 | while (*++pos == '/') |
114 | ; | |
115 | if (!*pos) | |
116 | break; | |
117 | *--pos = '\0'; | |
67d42212 JR |
118 | if (!stat(path, &st)) { |
119 | /* path exists */ | |
120 | if (!S_ISDIR(st.st_mode)) { | |
b2cb9425 | 121 | *pos = '/'; |
67d42212 | 122 | return -3; |
b2cb9425 | 123 | } |
457f06d6 | 124 | } |
67d42212 JR |
125 | else if (mkdir(path, 0777)) { |
126 | *pos = '/'; | |
127 | return -1; | |
128 | } | |
457f06d6 JS |
129 | else if (adjust_shared_perm(path)) { |
130 | *pos = '/'; | |
131 | return -2; | |
132 | } | |
b2cb9425 JH |
133 | *pos++ = '/'; |
134 | } | |
135 | return 0; | |
136 | } | |
723c31fe | 137 | |
8e21d63b JK |
138 | int safe_create_leading_directories_const(const char *path) |
139 | { | |
140 | /* path points to cache entries, so xstrdup before messing with it */ | |
141 | char *buf = xstrdup(path); | |
142 | int result = safe_create_leading_directories(buf); | |
143 | free(buf); | |
144 | return result; | |
145 | } | |
146 | ||
ace1534d JH |
147 | static void fill_sha1_path(char *pathbuf, const unsigned char *sha1) |
148 | { | |
149 | int i; | |
150 | for (i = 0; i < 20; i++) { | |
151 | static char hex[] = "0123456789abcdef"; | |
152 | unsigned int val = sha1[i]; | |
153 | char *pos = pathbuf + i*2 + (i > 0); | |
154 | *pos++ = hex[val >> 4]; | |
155 | *pos = hex[val & 0xf]; | |
156 | } | |
157 | } | |
158 | ||
0fcfd160 LT |
159 | /* |
160 | * NOTE! This returns a statically allocated buffer, so you have to be | |
790296fd | 161 | * careful about using it. Do an "xstrdup()" if you need to save the |
0fcfd160 | 162 | * filename. |
ace1534d JH |
163 | * |
164 | * Also note that this returns the location for creating. Reading | |
165 | * SHA1 file can happen from any alternate directory listed in the | |
d19938ab | 166 | * DB_ENVIRONMENT environment variable if it is not found in |
ace1534d | 167 | * the primary object database. |
0fcfd160 LT |
168 | */ |
169 | char *sha1_file_name(const unsigned char *sha1) | |
170 | { | |
560fb6a1 JK |
171 | static char buf[PATH_MAX]; |
172 | const char *objdir; | |
173 | int len; | |
0fcfd160 | 174 | |
560fb6a1 JK |
175 | objdir = get_object_directory(); |
176 | len = strlen(objdir); | |
177 | ||
178 | /* '/' + sha1(2) + '/' + sha1(38) + '\0' */ | |
179 | if (len + 43 > PATH_MAX) | |
180 | die("insanely long object directory %s", objdir); | |
181 | memcpy(buf, objdir, len); | |
182 | buf[len] = '/'; | |
183 | buf[len+3] = '/'; | |
184 | buf[len+42] = '\0'; | |
185 | fill_sha1_path(buf + len + 1, sha1); | |
186 | return buf; | |
0fcfd160 LT |
187 | } |
188 | ||
633f43e1 | 189 | static char *sha1_get_pack_name(const unsigned char *sha1, |
6eec46bd | 190 | char **name, char **base, const char *which) |
bf592c50 DB |
191 | { |
192 | static const char hex[] = "0123456789abcdef"; | |
633f43e1 | 193 | char *buf; |
bf592c50 DB |
194 | int i; |
195 | ||
633f43e1 | 196 | if (!*base) { |
bf592c50 DB |
197 | const char *sha1_file_directory = get_object_directory(); |
198 | int len = strlen(sha1_file_directory); | |
633f43e1 | 199 | *base = xmalloc(len + 60); |
6eec46bd JH |
200 | sprintf(*base, "%s/pack/pack-1234567890123456789012345678901234567890.%s", |
201 | sha1_file_directory, which); | |
633f43e1 | 202 | *name = *base + len + 11; |
bf592c50 DB |
203 | } |
204 | ||
633f43e1 | 205 | buf = *name; |
bf592c50 DB |
206 | |
207 | for (i = 0; i < 20; i++) { | |
208 | unsigned int val = *sha1++; | |
209 | *buf++ = hex[val >> 4]; | |
210 | *buf++ = hex[val & 0xf]; | |
211 | } | |
a6080a0a | 212 | |
633f43e1 | 213 | return *base; |
bf592c50 DB |
214 | } |
215 | ||
633f43e1 | 216 | char *sha1_pack_name(const unsigned char *sha1) |
bf592c50 | 217 | { |
633f43e1 | 218 | static char *name, *base; |
bf592c50 | 219 | |
6eec46bd | 220 | return sha1_get_pack_name(sha1, &name, &base, "pack"); |
633f43e1 | 221 | } |
bf592c50 | 222 | |
633f43e1 HO |
223 | char *sha1_pack_index_name(const unsigned char *sha1) |
224 | { | |
225 | static char *name, *base; | |
a6080a0a | 226 | |
6eec46bd | 227 | return sha1_get_pack_name(sha1, &name, &base, "idx"); |
bf592c50 DB |
228 | } |
229 | ||
d5a63b99 JH |
230 | struct alternate_object_database *alt_odb_list; |
231 | static struct alternate_object_database **alt_odb_tail; | |
ace1534d | 232 | |
f4e51683 | 233 | static int git_open_noatime(const char *name); |
c2f493a4 | 234 | |
ddd5d056 JH |
235 | /* |
236 | * Prepare alternate object database registry. | |
d5a63b99 JH |
237 | * |
238 | * The variable alt_odb_list points at the list of struct | |
239 | * alternate_object_database. The elements on this list come from | |
240 | * non-empty elements from colon separated ALTERNATE_DB_ENVIRONMENT | |
241 | * environment variable, and $GIT_OBJECT_DIRECTORY/info/alternates, | |
1494e038 JH |
242 | * whose contents is similar to that environment variable but can be |
243 | * LF separated. Its base points at a statically allocated buffer that | |
d5a63b99 JH |
244 | * contains "/the/directory/corresponding/to/.git/objects/...", while |
245 | * its name points just after the slash at the end of ".git/objects/" | |
246 | * in the example above, and has enough space to hold 40-byte hex | |
247 | * SHA1, an extra slash for the first level indirection, and the | |
248 | * terminating NUL. | |
ddd5d056 | 249 | */ |
6eac50d8 | 250 | static int link_alt_odb_entry(const char *entry, const char *relative_base, int depth) |
ace1534d | 251 | { |
1494e038 | 252 | const char *objdir = get_object_directory(); |
c2f493a4 MW |
253 | struct alternate_object_database *ent; |
254 | struct alternate_object_database *alt; | |
5bdf0a84 HW |
255 | int pfxlen, entlen; |
256 | struct strbuf pathbuf = STRBUF_INIT; | |
d5a63b99 | 257 | |
85dadc38 | 258 | if (!is_absolute_path(entry) && relative_base) { |
5bdf0a84 HW |
259 | strbuf_addstr(&pathbuf, real_path(relative_base)); |
260 | strbuf_addch(&pathbuf, '/'); | |
c2f493a4 | 261 | } |
6eac50d8 | 262 | strbuf_addstr(&pathbuf, entry); |
c2f493a4 | 263 | |
5bdf0a84 HW |
264 | normalize_path_copy(pathbuf.buf, pathbuf.buf); |
265 | ||
266 | pfxlen = strlen(pathbuf.buf); | |
267 | ||
268 | /* | |
269 | * The trailing slash after the directory name is given by | |
270 | * this function at the end. Remove duplicates. | |
271 | */ | |
272 | while (pfxlen && pathbuf.buf[pfxlen-1] == '/') | |
273 | pfxlen -= 1; | |
274 | ||
275 | entlen = pfxlen + 43; /* '/' + 2 hex + '/' + 38 hex + NUL */ | |
276 | ent = xmalloc(sizeof(*ent) + entlen); | |
277 | memcpy(ent->base, pathbuf.buf, pfxlen); | |
278 | strbuf_release(&pathbuf); | |
c2f493a4 MW |
279 | |
280 | ent->name = ent->base + pfxlen + 1; | |
281 | ent->base[pfxlen + 3] = '/'; | |
282 | ent->base[pfxlen] = ent->base[entlen-1] = 0; | |
283 | ||
284 | /* Detect cases where alternate disappeared */ | |
90b4a71c | 285 | if (!is_directory(ent->base)) { |
c2f493a4 MW |
286 | error("object directory %s does not exist; " |
287 | "check .git/objects/info/alternates.", | |
288 | ent->base); | |
289 | free(ent); | |
290 | return -1; | |
291 | } | |
292 | ||
293 | /* Prevent the common mistake of listing the same | |
294 | * thing twice, or object directory itself. | |
295 | */ | |
296 | for (alt = alt_odb_list; alt; alt = alt->next) { | |
297 | if (!memcmp(ent->base, alt->base, pfxlen)) { | |
298 | free(ent); | |
299 | return -1; | |
300 | } | |
301 | } | |
cb2912c3 | 302 | if (!strcmp(ent->base, objdir)) { |
c2f493a4 MW |
303 | free(ent); |
304 | return -1; | |
305 | } | |
306 | ||
307 | /* add the alternate entry */ | |
308 | *alt_odb_tail = ent; | |
309 | alt_odb_tail = &(ent->next); | |
310 | ent->next = NULL; | |
311 | ||
312 | /* recursively add alternates */ | |
313 | read_info_alternates(ent->base, depth + 1); | |
314 | ||
315 | ent->base[pfxlen] = '/'; | |
316 | ||
317 | return 0; | |
318 | } | |
319 | ||
c5950164 | 320 | static void link_alt_odb_entries(const char *alt, int len, int sep, |
c2f493a4 MW |
321 | const char *relative_base, int depth) |
322 | { | |
6eac50d8 MH |
323 | struct string_list entries = STRING_LIST_INIT_NODUP; |
324 | char *alt_copy; | |
325 | int i; | |
c2f493a4 MW |
326 | |
327 | if (depth > 5) { | |
328 | error("%s: ignoring alternate object stores, nesting too deep.", | |
329 | relative_base); | |
330 | return; | |
331 | } | |
332 | ||
c5950164 | 333 | alt_copy = xmemdupz(alt, len); |
6eac50d8 MH |
334 | string_list_split_in_place(&entries, alt_copy, sep, -1); |
335 | for (i = 0; i < entries.nr; i++) { | |
336 | const char *entry = entries.items[i].string; | |
337 | if (entry[0] == '\0' || entry[0] == '#') | |
9577e7e3 | 338 | continue; |
6eac50d8 MH |
339 | if (!is_absolute_path(entry) && depth) { |
340 | error("%s: ignoring relative alternate object store %s", | |
341 | relative_base, entry); | |
342 | } else { | |
343 | link_alt_odb_entry(entry, relative_base, depth); | |
9577e7e3 | 344 | } |
9577e7e3 | 345 | } |
6eac50d8 MH |
346 | string_list_clear(&entries, 0); |
347 | free(alt_copy); | |
d5a63b99 JH |
348 | } |
349 | ||
5e73633d | 350 | void read_info_alternates(const char * relative_base, int depth) |
d5a63b99 | 351 | { |
9577e7e3 | 352 | char *map; |
dc49cd76 | 353 | size_t mapsz; |
d5a63b99 | 354 | struct stat st; |
9cb18f56 JM |
355 | const char alt_file_name[] = "info/alternates"; |
356 | /* Given that relative_base is no longer than PATH_MAX, | |
357 | ensure that "path" has enough space to append "/", the | |
358 | file name, "info/alternates", and a trailing NUL. */ | |
359 | char path[PATH_MAX + 1 + sizeof alt_file_name]; | |
c2f493a4 | 360 | int fd; |
d5a63b99 | 361 | |
9cb18f56 | 362 | sprintf(path, "%s/%s", relative_base, alt_file_name); |
f4e51683 | 363 | fd = git_open_noatime(path); |
d5a63b99 JH |
364 | if (fd < 0) |
365 | return; | |
366 | if (fstat(fd, &st) || (st.st_size == 0)) { | |
367 | close(fd); | |
9a217f2a | 368 | return; |
ace1534d | 369 | } |
dc49cd76 SP |
370 | mapsz = xsize_t(st.st_size); |
371 | map = xmmap(NULL, mapsz, PROT_READ, MAP_PRIVATE, fd, 0); | |
d5a63b99 | 372 | close(fd); |
d5a63b99 | 373 | |
c5950164 | 374 | link_alt_odb_entries(map, mapsz, '\n', relative_base, depth); |
c2f493a4 | 375 | |
dc49cd76 | 376 | munmap(map, mapsz); |
ace1534d JH |
377 | } |
378 | ||
bef70b22 DB |
379 | void add_to_alternates_file(const char *reference) |
380 | { | |
381 | struct lock_file *lock = xcalloc(1, sizeof(struct lock_file)); | |
acd3b9ec | 382 | int fd = hold_lock_file_for_append(lock, git_path("objects/info/alternates"), LOCK_DIE_ON_ERROR); |
e6baf4a1 | 383 | char *alt = mkpath("%s\n", reference); |
bef70b22 DB |
384 | write_or_die(fd, alt, strlen(alt)); |
385 | if (commit_lock_file(lock)) | |
386 | die("could not close alternates file"); | |
387 | if (alt_odb_tail) | |
c5950164 | 388 | link_alt_odb_entries(alt, strlen(alt), '\n', NULL, 0); |
bef70b22 DB |
389 | } |
390 | ||
d79796bc JH |
391 | void foreach_alt_odb(alt_odb_fn fn, void *cb) |
392 | { | |
393 | struct alternate_object_database *ent; | |
394 | ||
395 | prepare_alt_odb(); | |
396 | for (ent = alt_odb_list; ent; ent = ent->next) | |
397 | if (fn(ent, cb)) | |
398 | return; | |
399 | } | |
400 | ||
c2f493a4 MW |
401 | void prepare_alt_odb(void) |
402 | { | |
554fe20d | 403 | const char *alt; |
c2f493a4 | 404 | |
7dc24aa5 SP |
405 | if (alt_odb_tail) |
406 | return; | |
407 | ||
c2f493a4 MW |
408 | alt = getenv(ALTERNATE_DB_ENVIRONMENT); |
409 | if (!alt) alt = ""; | |
410 | ||
c2f493a4 | 411 | alt_odb_tail = &alt_odb_list; |
c5950164 | 412 | link_alt_odb_entries(alt, strlen(alt), PATH_SEP, NULL, 0); |
c2f493a4 MW |
413 | |
414 | read_info_alternates(get_object_directory(), 0); | |
415 | } | |
416 | ||
0f4dc14a | 417 | static int has_loose_object_local(const unsigned char *sha1) |
ace1534d | 418 | { |
ace1534d | 419 | char *name = sha1_file_name(sha1); |
0f4dc14a BC |
420 | return !access(name, F_OK); |
421 | } | |
ace1534d | 422 | |
0f4dc14a BC |
423 | int has_loose_object_nonlocal(const unsigned char *sha1) |
424 | { | |
425 | struct alternate_object_database *alt; | |
9a217f2a | 426 | prepare_alt_odb(); |
d5a63b99 | 427 | for (alt = alt_odb_list; alt; alt = alt->next) { |
0f4dc14a | 428 | fill_sha1_path(alt->name, sha1); |
c529d75a LT |
429 | if (!access(alt->base, F_OK)) |
430 | return 1; | |
ace1534d | 431 | } |
c529d75a | 432 | return 0; |
ace1534d JH |
433 | } |
434 | ||
0f4dc14a BC |
435 | static int has_loose_object(const unsigned char *sha1) |
436 | { | |
437 | return has_loose_object_local(sha1) || | |
438 | has_loose_object_nonlocal(sha1); | |
439 | } | |
440 | ||
60bb8b14 | 441 | static unsigned int pack_used_ctr; |
a53128b6 SP |
442 | static unsigned int pack_mmap_calls; |
443 | static unsigned int peak_pack_open_windows; | |
444 | static unsigned int pack_open_windows; | |
c7934306 SP |
445 | static unsigned int pack_open_fds; |
446 | static unsigned int pack_max_fds; | |
a53128b6 | 447 | static size_t peak_pack_mapped; |
60bb8b14 | 448 | static size_t pack_mapped; |
9a217f2a | 449 | struct packed_git *packed_git; |
1f688557 | 450 | |
b79d18c9 | 451 | void pack_report(void) |
a53128b6 SP |
452 | { |
453 | fprintf(stderr, | |
e05db0fd PR |
454 | "pack_report: getpagesize() = %10" SZ_FMT "\n" |
455 | "pack_report: core.packedGitWindowSize = %10" SZ_FMT "\n" | |
456 | "pack_report: core.packedGitLimit = %10" SZ_FMT "\n", | |
9e42d6a1 SP |
457 | sz_fmt(getpagesize()), |
458 | sz_fmt(packed_git_window_size), | |
459 | sz_fmt(packed_git_limit)); | |
a53128b6 SP |
460 | fprintf(stderr, |
461 | "pack_report: pack_used_ctr = %10u\n" | |
462 | "pack_report: pack_mmap_calls = %10u\n" | |
463 | "pack_report: pack_open_windows = %10u / %10u\n" | |
e05db0fd PR |
464 | "pack_report: pack_mapped = " |
465 | "%10" SZ_FMT " / %10" SZ_FMT "\n", | |
a53128b6 SP |
466 | pack_used_ctr, |
467 | pack_mmap_calls, | |
468 | pack_open_windows, peak_pack_open_windows, | |
9e42d6a1 | 469 | sz_fmt(pack_mapped), sz_fmt(peak_pack_mapped)); |
a53128b6 SP |
470 | } |
471 | ||
42873078 | 472 | static int check_packed_git_idx(const char *path, struct packed_git *p) |
1f688557 JH |
473 | { |
474 | void *idx_map; | |
42873078 | 475 | struct pack_idx_header *hdr; |
dc49cd76 | 476 | size_t idx_size; |
74e34e1f | 477 | uint32_t version, nr, i, *index; |
f4e51683 | 478 | int fd = git_open_noatime(path); |
1f688557 | 479 | struct stat st; |
42873078 | 480 | |
1f688557 JH |
481 | if (fd < 0) |
482 | return -1; | |
483 | if (fstat(fd, &st)) { | |
484 | close(fd); | |
485 | return -1; | |
486 | } | |
dc49cd76 | 487 | idx_size = xsize_t(st.st_size); |
2d88451b SP |
488 | if (idx_size < 4 * 256 + 20 + 20) { |
489 | close(fd); | |
490 | return error("index file %s is too small", path); | |
491 | } | |
c4712e45 | 492 | idx_map = xmmap(NULL, idx_size, PROT_READ, MAP_PRIVATE, fd, 0); |
1f688557 | 493 | close(fd); |
1f688557 | 494 | |
42873078 NP |
495 | hdr = idx_map; |
496 | if (hdr->idx_signature == htonl(PACK_IDX_SIGNATURE)) { | |
74e34e1f NP |
497 | version = ntohl(hdr->idx_version); |
498 | if (version < 2 || version > 2) { | |
499 | munmap(idx_map, idx_size); | |
6e1c2344 | 500 | return error("index file %s is version %"PRIu32 |
74e34e1f NP |
501 | " and is not supported by this binary" |
502 | " (try upgrading GIT to a newer version)", | |
503 | path, version); | |
504 | } | |
505 | } else | |
506 | version = 1; | |
df1b059d | 507 | |
1f688557 | 508 | nr = 0; |
42873078 | 509 | index = idx_map; |
74e34e1f NP |
510 | if (version > 1) |
511 | index += 2; /* skip index header */ | |
1f688557 | 512 | for (i = 0; i < 256; i++) { |
326bf396 | 513 | uint32_t n = ntohl(index[i]); |
2d88451b SP |
514 | if (n < nr) { |
515 | munmap(idx_map, idx_size); | |
df1b059d | 516 | return error("non-monotonic index %s", path); |
2d88451b | 517 | } |
1f688557 JH |
518 | nr = n; |
519 | } | |
520 | ||
74e34e1f NP |
521 | if (version == 1) { |
522 | /* | |
523 | * Total size: | |
524 | * - 256 index entries 4 bytes each | |
525 | * - 24-byte entries * nr (20-byte sha1 + 4-byte offset) | |
526 | * - 20-byte SHA1 of the packfile | |
527 | * - 20-byte SHA1 file checksum | |
528 | */ | |
529 | if (idx_size != 4*256 + nr * 24 + 20 + 20) { | |
530 | munmap(idx_map, idx_size); | |
eef427a0 | 531 | return error("wrong index v1 file size in %s", path); |
74e34e1f NP |
532 | } |
533 | } else if (version == 2) { | |
534 | /* | |
535 | * Minimum size: | |
536 | * - 8 bytes of header | |
537 | * - 256 index entries 4 bytes each | |
538 | * - 20-byte sha1 entry * nr | |
539 | * - 4-byte crc entry * nr | |
540 | * - 4-byte offset entry * nr | |
541 | * - 20-byte SHA1 of the packfile | |
542 | * - 20-byte SHA1 file checksum | |
543 | * And after the 4-byte offset table might be a | |
544 | * variable sized table containing 8-byte entries | |
545 | * for offsets larger than 2^31. | |
546 | */ | |
547 | unsigned long min_size = 8 + 4*256 + nr*(20 + 4 + 4) + 20 + 20; | |
1164f1e4 LT |
548 | unsigned long max_size = min_size; |
549 | if (nr) | |
550 | max_size += (nr - 1)*8; | |
551 | if (idx_size < min_size || idx_size > max_size) { | |
74e34e1f | 552 | munmap(idx_map, idx_size); |
eef427a0 | 553 | return error("wrong index v2 file size in %s", path); |
74e34e1f | 554 | } |
7109c889 JH |
555 | if (idx_size != min_size && |
556 | /* | |
557 | * make sure we can deal with large pack offsets. | |
558 | * 31-bit signed offset won't be enough, neither | |
559 | * 32-bit unsigned one will be. | |
560 | */ | |
561 | (sizeof(off_t) <= 4)) { | |
562 | munmap(idx_map, idx_size); | |
563 | return error("pack too large for current definition of off_t in %s", path); | |
74e34e1f | 564 | } |
2d88451b | 565 | } |
1f688557 | 566 | |
74e34e1f | 567 | p->index_version = version; |
42873078 NP |
568 | p->index_data = idx_map; |
569 | p->index_size = idx_size; | |
57059091 | 570 | p->num_objects = nr; |
1f688557 JH |
571 | return 0; |
572 | } | |
573 | ||
bc8e478a | 574 | int open_pack_index(struct packed_git *p) |
d079837e SP |
575 | { |
576 | char *idx_name; | |
577 | int ret; | |
578 | ||
579 | if (p->index_data) | |
580 | return 0; | |
581 | ||
582 | idx_name = xstrdup(p->pack_name); | |
583 | strcpy(idx_name + strlen(idx_name) - strlen(".pack"), ".idx"); | |
584 | ret = check_packed_git_idx(idx_name, p); | |
585 | free(idx_name); | |
586 | return ret; | |
587 | } | |
588 | ||
11daf39b SP |
589 | static void scan_windows(struct packed_git *p, |
590 | struct packed_git **lru_p, | |
591 | struct pack_window **lru_w, | |
592 | struct pack_window **lru_l) | |
1f688557 | 593 | { |
11daf39b SP |
594 | struct pack_window *w, *w_l; |
595 | ||
596 | for (w_l = NULL, w = p->windows; w; w = w->next) { | |
597 | if (!w->inuse_cnt) { | |
598 | if (!*lru_w || w->last_used < (*lru_w)->last_used) { | |
599 | *lru_p = p; | |
600 | *lru_w = w; | |
601 | *lru_l = w_l; | |
54044bf8 | 602 | } |
54044bf8 | 603 | } |
11daf39b | 604 | w_l = w; |
f9253394 | 605 | } |
11daf39b SP |
606 | } |
607 | ||
d1efefa4 | 608 | static int unuse_one_window(struct packed_git *current, int keep_fd) |
11daf39b SP |
609 | { |
610 | struct packed_git *p, *lru_p = NULL; | |
611 | struct pack_window *lru_w = NULL, *lru_l = NULL; | |
612 | ||
613 | if (current) | |
614 | scan_windows(current, &lru_p, &lru_w, &lru_l); | |
615 | for (p = packed_git; p; p = p->next) | |
616 | scan_windows(p, &lru_p, &lru_w, &lru_l); | |
54044bf8 SP |
617 | if (lru_p) { |
618 | munmap(lru_w->base, lru_w->len); | |
619 | pack_mapped -= lru_w->len; | |
620 | if (lru_l) | |
621 | lru_l->next = lru_w->next; | |
622 | else { | |
623 | lru_p->windows = lru_w->next; | |
d131b7af SP |
624 | if (!lru_p->windows && lru_p->pack_fd != -1 |
625 | && lru_p->pack_fd != keep_fd) { | |
54044bf8 | 626 | close(lru_p->pack_fd); |
c7934306 | 627 | pack_open_fds--; |
54044bf8 SP |
628 | lru_p->pack_fd = -1; |
629 | } | |
630 | } | |
631 | free(lru_w); | |
a53128b6 | 632 | pack_open_windows--; |
54044bf8 SP |
633 | return 1; |
634 | } | |
635 | return 0; | |
f9253394 JH |
636 | } |
637 | ||
d1efefa4 | 638 | void release_pack_memory(size_t need, int fd) |
97bfeb34 SP |
639 | { |
640 | size_t cur = pack_mapped; | |
d1efefa4 | 641 | while (need >= (cur - pack_mapped) && unuse_one_window(NULL, fd)) |
97bfeb34 SP |
642 | ; /* nothing */ |
643 | } | |
644 | ||
58ecbd5e JN |
645 | void *xmmap(void *start, size_t length, |
646 | int prot, int flags, int fd, off_t offset) | |
647 | { | |
648 | void *ret = mmap(start, length, prot, flags, fd, offset); | |
649 | if (ret == MAP_FAILED) { | |
650 | if (!length) | |
651 | return NULL; | |
652 | release_pack_memory(length, fd); | |
653 | ret = mmap(start, length, prot, flags, fd, offset); | |
654 | if (ret == MAP_FAILED) | |
655 | die_errno("Out of memory? mmap failed"); | |
656 | } | |
657 | return ret; | |
658 | } | |
659 | ||
c9ced051 SP |
660 | void close_pack_windows(struct packed_git *p) |
661 | { | |
662 | while (p->windows) { | |
663 | struct pack_window *w = p->windows; | |
664 | ||
665 | if (w->inuse_cnt) | |
666 | die("pack '%s' still has open windows to it", | |
667 | p->pack_name); | |
668 | munmap(w->base, w->len); | |
669 | pack_mapped -= w->len; | |
670 | pack_open_windows--; | |
671 | p->windows = w->next; | |
672 | free(w); | |
673 | } | |
674 | } | |
675 | ||
03e79c88 | 676 | void unuse_pack(struct pack_window **w_cursor) |
f9253394 | 677 | { |
03e79c88 SP |
678 | struct pack_window *w = *w_cursor; |
679 | if (w) { | |
680 | w->inuse_cnt--; | |
681 | *w_cursor = NULL; | |
682 | } | |
1f688557 JH |
683 | } |
684 | ||
fa5fc15d SP |
685 | void close_pack_index(struct packed_git *p) |
686 | { | |
687 | if (p->index_data) { | |
688 | munmap((void *)p->index_data, p->index_size); | |
689 | p->index_data = NULL; | |
690 | } | |
691 | } | |
692 | ||
c74faea1 NP |
693 | /* |
694 | * This is used by git-repack in case a newly created pack happens to | |
695 | * contain the same set of objects as an existing one. In that case | |
696 | * the resulting file might be different even if its name would be the | |
697 | * same. It is best to close any reference to the old pack before it is | |
698 | * replaced on disk. Of course no index pointers nor windows for given pack | |
699 | * must subsist at this point. If ever objects from this pack are requested | |
700 | * again, the new version of the pack will be reinitialized through | |
701 | * reprepare_packed_git(). | |
702 | */ | |
703 | void free_pack_by_name(const char *pack_name) | |
704 | { | |
705 | struct packed_git *p, **pp = &packed_git; | |
706 | ||
707 | while (*pp) { | |
708 | p = *pp; | |
709 | if (strcmp(pack_name, p->pack_name) == 0) { | |
fa3a0c94 | 710 | clear_delta_base_cache(); |
c74faea1 | 711 | close_pack_windows(p); |
c7934306 | 712 | if (p->pack_fd != -1) { |
c74faea1 | 713 | close(p->pack_fd); |
c7934306 SP |
714 | pack_open_fds--; |
715 | } | |
fa5fc15d | 716 | close_pack_index(p); |
c74faea1 NP |
717 | free(p->bad_object_sha1); |
718 | *pp = p->next; | |
c01f51cc NTND |
719 | if (last_found_pack == p) |
720 | last_found_pack = NULL; | |
c74faea1 NP |
721 | free(p); |
722 | return; | |
723 | } | |
724 | pp = &p->next; | |
725 | } | |
726 | } | |
727 | ||
a0788266 JS |
728 | static unsigned int get_max_fd_limit(void) |
729 | { | |
730 | #ifdef RLIMIT_NOFILE | |
731 | struct rlimit lim; | |
732 | ||
733 | if (getrlimit(RLIMIT_NOFILE, &lim)) | |
734 | die_errno("cannot get RLIMIT_NOFILE"); | |
735 | ||
736 | return lim.rlim_cur; | |
737 | #elif defined(_SC_OPEN_MAX) | |
738 | return sysconf(_SC_OPEN_MAX); | |
739 | #elif defined(OPEN_MAX) | |
740 | return OPEN_MAX; | |
741 | #else | |
742 | return 1; /* see the caller ;-) */ | |
743 | #endif | |
744 | } | |
745 | ||
3cf8b462 SP |
746 | /* |
747 | * Do not call this directly as this leaks p->pack_fd on error return; | |
748 | * call open_packed_git() instead. | |
749 | */ | |
750 | static int open_packed_git_1(struct packed_git *p) | |
1f688557 | 751 | { |
9bc879c1 SP |
752 | struct stat st; |
753 | struct pack_header hdr; | |
754 | unsigned char sha1[20]; | |
755 | unsigned char *idx_sha1; | |
2c039da8 | 756 | long fd_flag; |
9bc879c1 | 757 | |
d079837e SP |
758 | if (!p->index_data && open_pack_index(p)) |
759 | return error("packfile %s index unavailable", p->pack_name); | |
760 | ||
c7934306 | 761 | if (!pack_max_fds) { |
a0788266 | 762 | unsigned int max_fds = get_max_fd_limit(); |
c7934306 SP |
763 | |
764 | /* Save 3 for stdin/stdout/stderr, 22 for work */ | |
765 | if (25 < max_fds) | |
766 | pack_max_fds = max_fds - 25; | |
767 | else | |
768 | pack_max_fds = 1; | |
769 | } | |
770 | ||
771 | while (pack_max_fds <= pack_open_fds && unuse_one_window(NULL, -1)) | |
772 | ; /* nothing */ | |
773 | ||
f4e51683 | 774 | p->pack_fd = git_open_noatime(p->pack_name); |
9bc879c1 | 775 | if (p->pack_fd < 0 || fstat(p->pack_fd, &st)) |
072db278 | 776 | return -1; |
c7934306 | 777 | pack_open_fds++; |
9bc879c1 SP |
778 | |
779 | /* If we created the struct before we had the pack we lack size. */ | |
bf592c50 | 780 | if (!p->pack_size) { |
bf592c50 | 781 | if (!S_ISREG(st.st_mode)) |
072db278 | 782 | return error("packfile %s not a regular file", p->pack_name); |
bf592c50 | 783 | p->pack_size = st.st_size; |
9bc879c1 | 784 | } else if (p->pack_size != st.st_size) |
072db278 | 785 | return error("packfile %s size changed", p->pack_name); |
9bc879c1 | 786 | |
2c039da8 JH |
787 | /* We leave these file descriptors open with sliding mmap; |
788 | * there is no point keeping them open across exec(), though. | |
789 | */ | |
790 | fd_flag = fcntl(p->pack_fd, F_GETFD, 0); | |
791 | if (fd_flag < 0) | |
072db278 | 792 | return error("cannot determine file descriptor flags"); |
2c039da8 JH |
793 | fd_flag |= FD_CLOEXEC; |
794 | if (fcntl(p->pack_fd, F_SETFD, fd_flag) == -1) | |
072db278 | 795 | return error("cannot set FD_CLOEXEC"); |
2c039da8 | 796 | |
9bc879c1 | 797 | /* Verify we recognize this pack file format. */ |
e6e2bd62 | 798 | if (read_in_full(p->pack_fd, &hdr, sizeof(hdr)) != sizeof(hdr)) |
072db278 | 799 | return error("file %s is far too short to be a packfile", p->pack_name); |
9bc879c1 | 800 | if (hdr.hdr_signature != htonl(PACK_SIGNATURE)) |
072db278 | 801 | return error("file %s is not a GIT packfile", p->pack_name); |
9bc879c1 | 802 | if (!pack_version_ok(hdr.hdr_version)) |
6e1c2344 RJ |
803 | return error("packfile %s is version %"PRIu32" and not" |
804 | " supported (try upgrading GIT to a newer version)", | |
9bc879c1 SP |
805 | p->pack_name, ntohl(hdr.hdr_version)); |
806 | ||
807 | /* Verify the pack matches its index. */ | |
57059091 | 808 | if (p->num_objects != ntohl(hdr.hdr_entries)) |
6e1c2344 RJ |
809 | return error("packfile %s claims to have %"PRIu32" objects" |
810 | " while index indicates %"PRIu32" objects", | |
57059091 NP |
811 | p->pack_name, ntohl(hdr.hdr_entries), |
812 | p->num_objects); | |
9bc879c1 | 813 | if (lseek(p->pack_fd, p->pack_size - sizeof(sha1), SEEK_SET) == -1) |
072db278 | 814 | return error("end of packfile %s is unavailable", p->pack_name); |
e6e2bd62 | 815 | if (read_in_full(p->pack_fd, sha1, sizeof(sha1)) != sizeof(sha1)) |
072db278 | 816 | return error("packfile %s signature is unavailable", p->pack_name); |
42873078 | 817 | idx_sha1 = ((unsigned char *)p->index_data) + p->index_size - 40; |
9bc879c1 | 818 | if (hashcmp(sha1, idx_sha1)) |
072db278 SP |
819 | return error("packfile %s does not match index", p->pack_name); |
820 | return 0; | |
9bc879c1 SP |
821 | } |
822 | ||
3cf8b462 SP |
823 | static int open_packed_git(struct packed_git *p) |
824 | { | |
825 | if (!open_packed_git_1(p)) | |
826 | return 0; | |
827 | if (p->pack_fd != -1) { | |
828 | close(p->pack_fd); | |
c7934306 | 829 | pack_open_fds--; |
3cf8b462 SP |
830 | p->pack_fd = -1; |
831 | } | |
832 | return -1; | |
833 | } | |
834 | ||
c4001d92 | 835 | static int in_window(struct pack_window *win, off_t offset) |
60bb8b14 SP |
836 | { |
837 | /* We must promise at least 20 bytes (one hash) after the | |
838 | * offset is available from this window, otherwise the offset | |
839 | * is not actually in this window and a different window (which | |
840 | * has that one hash excess) must be used. This is to support | |
841 | * the object header and delta base parsing routines below. | |
842 | */ | |
843 | off_t win_off = win->offset; | |
844 | return win_off <= offset | |
845 | && (offset + 20) <= (win_off + win->len); | |
846 | } | |
847 | ||
4b25d091 | 848 | unsigned char *use_pack(struct packed_git *p, |
03e79c88 | 849 | struct pack_window **w_cursor, |
c4001d92 | 850 | off_t offset, |
ef49a7a0 | 851 | unsigned long *left) |
9bc879c1 | 852 | { |
60bb8b14 | 853 | struct pack_window *win = *w_cursor; |
03e79c88 | 854 | |
a9d98a14 | 855 | /* Since packfiles end in a hash of their content and it's |
60bb8b14 SP |
856 | * pointless to ask for an offset into the middle of that |
857 | * hash, and the in_window function above wouldn't match | |
858 | * don't allow an offset too close to the end of the file. | |
859 | */ | |
d131b7af SP |
860 | if (!p->pack_size && p->pack_fd == -1 && open_packed_git(p)) |
861 | die("packfile %s cannot be accessed", p->pack_name); | |
60bb8b14 SP |
862 | if (offset > (p->pack_size - 20)) |
863 | die("offset beyond end of packfile (truncated pack?)"); | |
864 | ||
865 | if (!win || !in_window(win, offset)) { | |
866 | if (win) | |
867 | win->inuse_cnt--; | |
868 | for (win = p->windows; win; win = win->next) { | |
869 | if (in_window(win, offset)) | |
870 | break; | |
871 | } | |
872 | if (!win) { | |
78a28df9 | 873 | size_t window_align = packed_git_window_size / 2; |
dc49cd76 | 874 | off_t len; |
d131b7af SP |
875 | |
876 | if (p->pack_fd == -1 && open_packed_git(p)) | |
877 | die("packfile %s cannot be accessed", p->pack_name); | |
878 | ||
60bb8b14 | 879 | win = xcalloc(1, sizeof(*win)); |
78a28df9 | 880 | win->offset = (offset / window_align) * window_align; |
dc49cd76 SP |
881 | len = p->pack_size - win->offset; |
882 | if (len > packed_git_window_size) | |
883 | len = packed_git_window_size; | |
884 | win->len = (size_t)len; | |
60bb8b14 | 885 | pack_mapped += win->len; |
11daf39b | 886 | while (packed_git_limit < pack_mapped |
d1efefa4 | 887 | && unuse_one_window(p, p->pack_fd)) |
60bb8b14 | 888 | ; /* nothing */ |
c4712e45 | 889 | win->base = xmmap(NULL, win->len, |
60bb8b14 SP |
890 | PROT_READ, MAP_PRIVATE, |
891 | p->pack_fd, win->offset); | |
892 | if (win->base == MAP_FAILED) | |
73b4e4be SP |
893 | die("packfile %s cannot be mapped: %s", |
894 | p->pack_name, | |
895 | strerror(errno)); | |
d131b7af SP |
896 | if (!win->offset && win->len == p->pack_size |
897 | && !p->do_not_close) { | |
898 | close(p->pack_fd); | |
899 | pack_open_fds--; | |
900 | p->pack_fd = -1; | |
901 | } | |
a53128b6 SP |
902 | pack_mmap_calls++; |
903 | pack_open_windows++; | |
904 | if (pack_mapped > peak_pack_mapped) | |
905 | peak_pack_mapped = pack_mapped; | |
906 | if (pack_open_windows > peak_pack_open_windows) | |
907 | peak_pack_open_windows = pack_open_windows; | |
60bb8b14 SP |
908 | win->next = p->windows; |
909 | p->windows = win; | |
910 | } | |
1f688557 | 911 | } |
03e79c88 SP |
912 | if (win != *w_cursor) { |
913 | win->last_used = pack_used_ctr++; | |
914 | win->inuse_cnt++; | |
915 | *w_cursor = win; | |
916 | } | |
60bb8b14 | 917 | offset -= win->offset; |
03e79c88 | 918 | if (left) |
dc49cd76 | 919 | *left = win->len - xsize_t(offset); |
03e79c88 | 920 | return win->base + offset; |
1f688557 JH |
921 | } |
922 | ||
27d69a46 NP |
923 | static struct packed_git *alloc_packed_git(int extra) |
924 | { | |
925 | struct packed_git *p = xmalloc(sizeof(*p) + extra); | |
926 | memset(p, 0, sizeof(*p)); | |
927 | p->pack_fd = -1; | |
928 | return p; | |
929 | } | |
930 | ||
e0500293 JN |
931 | static void try_to_free_pack_memory(size_t size) |
932 | { | |
933 | release_pack_memory(size, -1); | |
934 | } | |
935 | ||
42873078 | 936 | struct packed_git *add_packed_git(const char *path, int path_len, int local) |
1f688557 | 937 | { |
e0500293 | 938 | static int have_set_try_to_free_routine; |
1f688557 | 939 | struct stat st; |
27d69a46 | 940 | struct packed_git *p = alloc_packed_git(path_len + 2); |
1f688557 | 941 | |
e0500293 JN |
942 | if (!have_set_try_to_free_routine) { |
943 | have_set_try_to_free_routine = 1; | |
944 | set_try_to_free_routine(try_to_free_pack_memory); | |
945 | } | |
946 | ||
42873078 NP |
947 | /* |
948 | * Make sure a corresponding .pack file exists and that | |
949 | * the index looks sane. | |
950 | */ | |
951 | path_len -= strlen(".idx"); | |
27d69a46 NP |
952 | if (path_len < 1) { |
953 | free(p); | |
1f688557 | 954 | return NULL; |
27d69a46 | 955 | } |
42873078 | 956 | memcpy(p->pack_name, path, path_len); |
8d25931d BC |
957 | |
958 | strcpy(p->pack_name + path_len, ".keep"); | |
959 | if (!access(p->pack_name, F_OK)) | |
960 | p->pack_keep = 1; | |
961 | ||
42873078 | 962 | strcpy(p->pack_name + path_len, ".pack"); |
d079837e | 963 | if (stat(p->pack_name, &st) || !S_ISREG(st.st_mode)) { |
42873078 | 964 | free(p); |
1f688557 JH |
965 | return NULL; |
966 | } | |
42873078 | 967 | |
1f688557 JH |
968 | /* ok, it looks sane as far as we can check without |
969 | * actually mapping the pack file. | |
970 | */ | |
1f688557 | 971 | p->pack_size = st.st_size; |
9d835df2 | 972 | p->pack_local = local; |
b867092f | 973 | p->mtime = st.st_mtime; |
42873078 NP |
974 | if (path_len < 40 || get_sha1_hex(path + path_len - 40, p->sha1)) |
975 | hashclr(p->sha1); | |
1f688557 JH |
976 | return p; |
977 | } | |
978 | ||
7b64469a | 979 | struct packed_git *parse_pack_index(unsigned char *sha1, const char *idx_path) |
c508df5e | 980 | { |
42873078 | 981 | const char *path = sha1_pack_name(sha1); |
27d69a46 | 982 | struct packed_git *p = alloc_packed_git(strlen(path) + 1); |
bf592c50 | 983 | |
27d69a46 NP |
984 | strcpy(p->pack_name, path); |
985 | hashcpy(p->sha1, sha1); | |
42873078 NP |
986 | if (check_packed_git_idx(idx_path, p)) { |
987 | free(p); | |
bf592c50 | 988 | return NULL; |
42873078 | 989 | } |
bf592c50 | 990 | |
bf592c50 DB |
991 | return p; |
992 | } | |
993 | ||
994 | void install_packed_git(struct packed_git *pack) | |
995 | { | |
c7934306 SP |
996 | if (pack->pack_fd != -1) |
997 | pack_open_fds++; | |
998 | ||
bf592c50 DB |
999 | pack->next = packed_git; |
1000 | packed_git = pack; | |
1001 | } | |
1002 | ||
9d835df2 | 1003 | static void prepare_packed_git_one(char *objdir, int local) |
1f688557 | 1004 | { |
9cb18f56 JM |
1005 | /* Ensure that this buffer is large enough so that we can |
1006 | append "/pack/" without clobbering the stack even if | |
1007 | strlen(objdir) were PATH_MAX. */ | |
1008 | char path[PATH_MAX + 1 + 4 + 1 + 1]; | |
1f688557 JH |
1009 | int len; |
1010 | DIR *dir; | |
1011 | struct dirent *de; | |
1012 | ||
1013 | sprintf(path, "%s/pack", objdir); | |
1014 | len = strlen(path); | |
1015 | dir = opendir(path); | |
b5b16990 | 1016 | if (!dir) { |
26125f6b | 1017 | if (errno != ENOENT) |
bd2afde8 | 1018 | error("unable to open object pack directory: %s: %s", |
26125f6b | 1019 | path, strerror(errno)); |
1f688557 | 1020 | return; |
b5b16990 | 1021 | } |
1f688557 JH |
1022 | path[len++] = '/'; |
1023 | while ((de = readdir(dir)) != NULL) { | |
1024 | int namelen = strlen(de->d_name); | |
1025 | struct packed_git *p; | |
1026 | ||
5bb1cda5 | 1027 | if (!has_extension(de->d_name, ".idx")) |
1f688557 JH |
1028 | continue; |
1029 | ||
9cb18f56 JM |
1030 | if (len + namelen + 1 > sizeof(path)) |
1031 | continue; | |
1032 | ||
54a15a8d | 1033 | /* Don't reopen a pack we already have. */ |
1f688557 | 1034 | strcpy(path + len, de->d_name); |
86f7780c JK |
1035 | for (p = packed_git; p; p = p->next) { |
1036 | if (!memcmp(path, p->pack_name, len + namelen - 4)) | |
1037 | break; | |
1038 | } | |
1039 | if (p) | |
1040 | continue; | |
54a15a8d SP |
1041 | /* See if it really is a valid .idx file with corresponding |
1042 | * .pack file that we can map. | |
1043 | */ | |
9d835df2 | 1044 | p = add_packed_git(path, len + namelen, local); |
1f688557 JH |
1045 | if (!p) |
1046 | continue; | |
625e9421 | 1047 | install_packed_git(p); |
1f688557 | 1048 | } |
5b35bcd5 | 1049 | closedir(dir); |
1f688557 JH |
1050 | } |
1051 | ||
b867092f JH |
1052 | static int sort_pack(const void *a_, const void *b_) |
1053 | { | |
1054 | struct packed_git *a = *((struct packed_git **)a_); | |
1055 | struct packed_git *b = *((struct packed_git **)b_); | |
1056 | int st; | |
1057 | ||
1058 | /* | |
1059 | * Local packs tend to contain objects specific to our | |
1060 | * variant of the project than remote ones. In addition, | |
1061 | * remote ones could be on a network mounted filesystem. | |
1062 | * Favor local ones for these reasons. | |
1063 | */ | |
1064 | st = a->pack_local - b->pack_local; | |
1065 | if (st) | |
1066 | return -st; | |
1067 | ||
1068 | /* | |
1069 | * Younger packs tend to contain more recent objects, | |
1070 | * and more recent objects tend to get accessed more | |
1071 | * often. | |
1072 | */ | |
1073 | if (a->mtime < b->mtime) | |
1074 | return 1; | |
1075 | else if (a->mtime == b->mtime) | |
1076 | return 0; | |
1077 | return -1; | |
1078 | } | |
1079 | ||
1080 | static void rearrange_packed_git(void) | |
1081 | { | |
1082 | struct packed_git **ary, *p; | |
1083 | int i, n; | |
1084 | ||
1085 | for (n = 0, p = packed_git; p; p = p->next) | |
1086 | n++; | |
1087 | if (n < 2) | |
1088 | return; | |
1089 | ||
1090 | /* prepare an array of packed_git for easier sorting */ | |
1091 | ary = xcalloc(n, sizeof(struct packed_git *)); | |
1092 | for (n = 0, p = packed_git; p; p = p->next) | |
1093 | ary[n++] = p; | |
1094 | ||
1095 | qsort(ary, n, sizeof(struct packed_git *), sort_pack); | |
1096 | ||
1097 | /* link them back again */ | |
1098 | for (i = 0; i < n - 1; i++) | |
1099 | ary[i]->next = ary[i + 1]; | |
1100 | ary[n - 1]->next = NULL; | |
1101 | packed_git = ary[0]; | |
1102 | ||
1103 | free(ary); | |
1104 | } | |
1105 | ||
637cdd9d | 1106 | static int prepare_packed_git_run_once = 0; |
9a217f2a | 1107 | void prepare_packed_git(void) |
1f688557 | 1108 | { |
d5a63b99 | 1109 | struct alternate_object_database *alt; |
1f688557 | 1110 | |
637cdd9d | 1111 | if (prepare_packed_git_run_once) |
1f688557 | 1112 | return; |
9d835df2 | 1113 | prepare_packed_git_one(get_object_directory(), 1); |
9a217f2a | 1114 | prepare_alt_odb(); |
d5a63b99 | 1115 | for (alt = alt_odb_list; alt; alt = alt->next) { |
1494e038 | 1116 | alt->name[-1] = 0; |
9d835df2 | 1117 | prepare_packed_git_one(alt->base, 0); |
1494e038 | 1118 | alt->name[-1] = '/'; |
1f688557 | 1119 | } |
b867092f | 1120 | rearrange_packed_git(); |
637cdd9d JK |
1121 | prepare_packed_git_run_once = 1; |
1122 | } | |
1123 | ||
fc04c412 | 1124 | void reprepare_packed_git(void) |
637cdd9d | 1125 | { |
4b480c67 | 1126 | discard_revindex(); |
637cdd9d JK |
1127 | prepare_packed_git_run_once = 0; |
1128 | prepare_packed_git(); | |
1f688557 JH |
1129 | } |
1130 | ||
8eca0b47 NP |
1131 | static void mark_bad_packed_object(struct packed_git *p, |
1132 | const unsigned char *sha1) | |
1133 | { | |
1134 | unsigned i; | |
1135 | for (i = 0; i < p->num_bad_objects; i++) | |
1136 | if (!hashcmp(sha1, p->bad_object_sha1 + 20 * i)) | |
1137 | return; | |
1138 | p->bad_object_sha1 = xrealloc(p->bad_object_sha1, 20 * (p->num_bad_objects + 1)); | |
1139 | hashcpy(p->bad_object_sha1 + 20 * p->num_bad_objects, sha1); | |
1140 | p->num_bad_objects++; | |
1141 | } | |
1142 | ||
b6c4cecc | 1143 | static const struct packed_git *has_packed_and_bad(const unsigned char *sha1) |
ac939109 NP |
1144 | { |
1145 | struct packed_git *p; | |
1146 | unsigned i; | |
1147 | ||
1148 | for (p = packed_git; p; p = p->next) | |
1149 | for (i = 0; i < p->num_bad_objects; i++) | |
1150 | if (!hashcmp(sha1, p->bad_object_sha1 + 20 * i)) | |
b6c4cecc JH |
1151 | return p; |
1152 | return NULL; | |
ac939109 NP |
1153 | } |
1154 | ||
090ea126 NTND |
1155 | /* |
1156 | * With an in-core object data in "map", rehash it to make sure the | |
1157 | * object name actually matches "sha1" to detect object corruption. | |
1158 | * With "map" == NULL, try reading the object named with "sha1" using | |
1159 | * the streaming interface and rehash it to do the same. | |
1160 | */ | |
1161 | int check_sha1_signature(const unsigned char *sha1, void *map, | |
1162 | unsigned long size, const char *type) | |
0fcfd160 LT |
1163 | { |
1164 | unsigned char real_sha1[20]; | |
090ea126 NTND |
1165 | enum object_type obj_type; |
1166 | struct git_istream *st; | |
1167 | git_SHA_CTX c; | |
1168 | char hdr[32]; | |
1169 | int hdrlen; | |
1170 | ||
1171 | if (map) { | |
1172 | hash_sha1_file(map, size, type, real_sha1); | |
1173 | return hashcmp(sha1, real_sha1) ? -1 : 0; | |
1174 | } | |
1175 | ||
1176 | st = open_istream(sha1, &obj_type, &size, NULL); | |
1177 | if (!st) | |
1178 | return -1; | |
1179 | ||
1180 | /* Generate the header */ | |
1181 | hdrlen = sprintf(hdr, "%s %lu", typename(obj_type), size) + 1; | |
1182 | ||
1183 | /* Sha1.. */ | |
1184 | git_SHA1_Init(&c); | |
1185 | git_SHA1_Update(&c, hdr, hdrlen); | |
1186 | for (;;) { | |
1187 | char buf[1024 * 16]; | |
1188 | ssize_t readlen = read_istream(st, buf, sizeof(buf)); | |
1189 | ||
1190 | if (!readlen) | |
1191 | break; | |
1192 | git_SHA1_Update(&c, buf, readlen); | |
1193 | } | |
1194 | git_SHA1_Final(real_sha1, &c); | |
1195 | close_istream(st); | |
a89fccd2 | 1196 | return hashcmp(sha1, real_sha1) ? -1 : 0; |
0fcfd160 LT |
1197 | } |
1198 | ||
f4e51683 | 1199 | static int git_open_noatime(const char *name) |
44d1c19e LT |
1200 | { |
1201 | static int sha1_file_open_flag = O_NOATIME; | |
44d1c19e | 1202 | |
f2e872aa SP |
1203 | for (;;) { |
1204 | int fd = open(name, O_RDONLY | sha1_file_open_flag); | |
44d1c19e | 1205 | if (fd >= 0) |
f2e872aa SP |
1206 | return fd; |
1207 | ||
f2e872aa SP |
1208 | /* Might the failure be due to O_NOATIME? */ |
1209 | if (errno != ENOENT && sha1_file_open_flag) { | |
44d1c19e | 1210 | sha1_file_open_flag = 0; |
f2e872aa SP |
1211 | continue; |
1212 | } | |
1213 | ||
1214 | return -1; | |
44d1c19e | 1215 | } |
44d1c19e LT |
1216 | } |
1217 | ||
1218 | static int open_sha1_file(const unsigned char *sha1) | |
1219 | { | |
1220 | int fd; | |
1221 | char *name = sha1_file_name(sha1); | |
1222 | struct alternate_object_database *alt; | |
1223 | ||
f4e51683 | 1224 | fd = git_open_noatime(name); |
44d1c19e LT |
1225 | if (fd >= 0) |
1226 | return fd; | |
1227 | ||
1228 | prepare_alt_odb(); | |
1229 | errno = ENOENT; | |
1230 | for (alt = alt_odb_list; alt; alt = alt->next) { | |
1231 | name = alt->name; | |
1232 | fill_sha1_path(name, sha1); | |
f4e51683 | 1233 | fd = git_open_noatime(alt->base); |
44d1c19e LT |
1234 | if (fd >= 0) |
1235 | return fd; | |
1236 | } | |
1237 | return -1; | |
1238 | } | |
1239 | ||
f0270efd | 1240 | void *map_sha1_file(const unsigned char *sha1, unsigned long *size) |
0fcfd160 | 1241 | { |
0fcfd160 | 1242 | void *map; |
144bde78 | 1243 | int fd; |
ace1534d | 1244 | |
44d1c19e LT |
1245 | fd = open_sha1_file(sha1); |
1246 | map = NULL; | |
1247 | if (fd >= 0) { | |
1248 | struct stat st; | |
0fcfd160 | 1249 | |
44d1c19e LT |
1250 | if (!fstat(fd, &st)) { |
1251 | *size = xsize_t(st.st_size); | |
33e42de0 MM |
1252 | if (!*size) { |
1253 | /* mmap() is forbidden on empty files */ | |
1254 | error("object file %s is empty", sha1_file_name(sha1)); | |
1255 | return NULL; | |
1256 | } | |
44d1c19e | 1257 | map = xmmap(NULL, *size, PROT_READ, MAP_PRIVATE, fd, 0); |
144bde78 | 1258 | } |
44d1c19e | 1259 | close(fd); |
0fcfd160 | 1260 | } |
0fcfd160 LT |
1261 | return map; |
1262 | } | |
1263 | ||
cc5c54e7 JH |
1264 | /* |
1265 | * There used to be a second loose object header format which | |
1266 | * was meant to mimic the in-pack format, allowing for direct | |
1267 | * copy of the object data. This format turned up not to be | |
1268 | * really worth it and we no longer write loose objects in that | |
1269 | * format. | |
1270 | */ | |
1271 | static int experimental_loose_object(unsigned char *map) | |
bb6b8e4f JH |
1272 | { |
1273 | unsigned int word; | |
1274 | ||
1275 | /* | |
7f684a2a RT |
1276 | * We must determine if the buffer contains the standard |
1277 | * zlib-deflated stream or the experimental format based | |
1278 | * on the in-pack object format. Compare the header byte | |
1279 | * for each format: | |
1280 | * | |
1281 | * RFC1950 zlib w/ deflate : 0www1000 : 0 <= www <= 7 | |
1282 | * Experimental pack-based : Stttssss : ttt = 1,2,3,4 | |
1283 | * | |
1284 | * If bit 7 is clear and bits 0-3 equal 8, the buffer MUST be | |
1285 | * in standard loose-object format, UNLESS it is a Git-pack | |
1286 | * format object *exactly* 8 bytes in size when inflated. | |
1287 | * | |
1288 | * However, RFC1950 also specifies that the 1st 16-bit word | |
1289 | * must be divisible by 31 - this checksum tells us our buffer | |
1290 | * is in the standard format, giving a false positive only if | |
1291 | * the 1st word of the Git-pack format object happens to be | |
1292 | * divisible by 31, ie: | |
1293 | * ((byte0 * 256) + byte1) % 31 = 0 | |
1294 | * => 0ttt10000www1000 % 31 = 0 | |
1295 | * | |
1296 | * As it happens, this case can only arise for www=3 & ttt=1 | |
1297 | * - ie, a Commit object, which would have to be 8 bytes in | |
1298 | * size. As no Commit can be that small, we find that the | |
1299 | * combination of these two criteria (bitmask & checksum) | |
1300 | * can always correctly determine the buffer format. | |
bb6b8e4f JH |
1301 | */ |
1302 | word = (map[0] << 8) + map[1]; | |
7f684a2a | 1303 | if ((map[0] & 0x8F) == 0x08 && !(word % 31)) |
bb6b8e4f | 1304 | return 0; |
cc5c54e7 JH |
1305 | else |
1306 | return 1; | |
bb6b8e4f JH |
1307 | } |
1308 | ||
09ded04b NP |
1309 | unsigned long unpack_object_header_buffer(const unsigned char *buf, |
1310 | unsigned long len, enum object_type *type, unsigned long *sizep) | |
c4483576 | 1311 | { |
ad1ed5ee | 1312 | unsigned shift; |
48fb7deb | 1313 | unsigned long size, c; |
ad1ed5ee JH |
1314 | unsigned long used = 0; |
1315 | ||
1316 | c = buf[used++]; | |
1317 | *type = (c >> 4) & 7; | |
1318 | size = c & 15; | |
1319 | shift = 4; | |
1320 | while (c & 0x80) { | |
f630cfda | 1321 | if (len <= used || bitsizeof(long) <= shift) { |
09ded04b | 1322 | error("bad object header"); |
ea4f9685 JH |
1323 | size = used = 0; |
1324 | break; | |
09ded04b | 1325 | } |
ad1ed5ee JH |
1326 | c = buf[used++]; |
1327 | size += (c & 0x7f) << shift; | |
1328 | shift += 7; | |
1329 | } | |
1330 | *sizep = size; | |
1331 | return used; | |
1332 | } | |
1333 | ||
eb4f4076 | 1334 | int unpack_sha1_header(git_zstream *stream, unsigned char *map, unsigned long mapsize, void *buffer, unsigned long bufsiz) |
ad1ed5ee JH |
1335 | { |
1336 | unsigned long size, used; | |
1337 | static const char valid_loose_object_type[8] = { | |
1338 | 0, /* OBJ_EXT */ | |
1339 | 1, 1, 1, 1, /* "commit", "tree", "blob", "tag" */ | |
1340 | 0, /* "delta" and others are invalid in a loose object */ | |
93821bd9 | 1341 | }; |
ad1ed5ee | 1342 | enum object_type type; |
93821bd9 | 1343 | |
c4483576 LT |
1344 | /* Get the data stream */ |
1345 | memset(stream, 0, sizeof(*stream)); | |
1346 | stream->next_in = map; | |
1347 | stream->avail_in = mapsize; | |
1348 | stream->next_out = buffer; | |
93821bd9 LT |
1349 | stream->avail_out = bufsiz; |
1350 | ||
cc5c54e7 JH |
1351 | if (experimental_loose_object(map)) { |
1352 | /* | |
1353 | * The old experimental format we no longer produce; | |
1354 | * we can still read it. | |
1355 | */ | |
1356 | used = unpack_object_header_buffer(map, mapsize, &type, &size); | |
1357 | if (!used || !valid_loose_object_type[type]) | |
1358 | return -1; | |
1359 | map += used; | |
1360 | mapsize -= used; | |
726f852b | 1361 | |
cc5c54e7 JH |
1362 | /* Set up the stream for the rest.. */ |
1363 | stream->next_in = map; | |
1364 | stream->avail_in = mapsize; | |
1365 | git_inflate_init(stream); | |
93821bd9 | 1366 | |
cc5c54e7 JH |
1367 | /* And generate the fake traditional header */ |
1368 | stream->total_out = 1 + snprintf(buffer, bufsiz, "%s %lu", | |
1369 | typename(type), size); | |
1370 | return 0; | |
1371 | } | |
39c68542 | 1372 | git_inflate_init(stream); |
cc5c54e7 | 1373 | return git_inflate(stream, 0); |
c4483576 LT |
1374 | } |
1375 | ||
ef49a7a0 | 1376 | static void *unpack_sha1_rest(git_zstream *stream, void *buffer, unsigned long size, const unsigned char *sha1) |
5180cacc LT |
1377 | { |
1378 | int bytes = strlen(buffer) + 1; | |
3aee68aa | 1379 | unsigned char *buf = xmallocz(size); |
93821bd9 | 1380 | unsigned long n; |
7efbff75 | 1381 | int status = Z_OK; |
5180cacc | 1382 | |
93821bd9 LT |
1383 | n = stream->total_out - bytes; |
1384 | if (n > size) | |
1385 | n = size; | |
1386 | memcpy(buf, (char *) buffer + bytes, n); | |
1387 | bytes = n; | |
456cdf6e LT |
1388 | if (bytes <= size) { |
1389 | /* | |
1390 | * The above condition must be (bytes <= size), not | |
1391 | * (bytes < size). In other words, even though we | |
ccf5ace0 | 1392 | * expect no more output and set avail_out to zero, |
456cdf6e LT |
1393 | * the input zlib stream may have bytes that express |
1394 | * "this concludes the stream", and we *do* want to | |
1395 | * eat that input. | |
1396 | * | |
1397 | * Otherwise we would not be able to test that we | |
1398 | * consumed all the input to reach the expected size; | |
1399 | * we also want to check that zlib tells us that all | |
1400 | * went well with status == Z_STREAM_END at the end. | |
1401 | */ | |
5180cacc LT |
1402 | stream->next_out = buf + bytes; |
1403 | stream->avail_out = size - bytes; | |
7efbff75 | 1404 | while (status == Z_OK) |
39c68542 | 1405 | status = git_inflate(stream, Z_FINISH); |
5180cacc | 1406 | } |
456cdf6e | 1407 | if (status == Z_STREAM_END && !stream->avail_in) { |
39c68542 | 1408 | git_inflate_end(stream); |
7efbff75 JH |
1409 | return buf; |
1410 | } | |
1411 | ||
1412 | if (status < 0) | |
1413 | error("corrupt loose object '%s'", sha1_to_hex(sha1)); | |
1414 | else if (stream->avail_in) | |
1415 | error("garbage at end of loose object '%s'", | |
1416 | sha1_to_hex(sha1)); | |
1417 | free(buf); | |
1418 | return NULL; | |
5180cacc LT |
1419 | } |
1420 | ||
1421 | /* | |
1422 | * We used to just use "sscanf()", but that's actually way | |
1423 | * too permissive for what we want to check. So do an anal | |
1424 | * object header parse by hand. | |
1425 | */ | |
f0270efd | 1426 | int parse_sha1_header(const char *hdr, unsigned long *sizep) |
5180cacc | 1427 | { |
21666f1a | 1428 | char type[10]; |
5180cacc LT |
1429 | int i; |
1430 | unsigned long size; | |
1431 | ||
1432 | /* | |
a6080a0a | 1433 | * The type can be at most ten bytes (including the |
5180cacc | 1434 | * terminating '\0' that we add), and is followed by |
21666f1a | 1435 | * a space. |
5180cacc | 1436 | */ |
21666f1a | 1437 | i = 0; |
5180cacc LT |
1438 | for (;;) { |
1439 | char c = *hdr++; | |
1440 | if (c == ' ') | |
1441 | break; | |
21666f1a NP |
1442 | type[i++] = c; |
1443 | if (i >= sizeof(type)) | |
5180cacc | 1444 | return -1; |
5180cacc | 1445 | } |
21666f1a | 1446 | type[i] = 0; |
5180cacc LT |
1447 | |
1448 | /* | |
1449 | * The length must follow immediately, and be in canonical | |
1450 | * decimal format (ie "010" is not valid). | |
1451 | */ | |
1452 | size = *hdr++ - '0'; | |
1453 | if (size > 9) | |
1454 | return -1; | |
1455 | if (size) { | |
1456 | for (;;) { | |
1457 | unsigned long c = *hdr - '0'; | |
1458 | if (c > 9) | |
1459 | break; | |
1460 | hdr++; | |
1461 | size = size * 10 + c; | |
1462 | } | |
1463 | } | |
1464 | *sizep = size; | |
1465 | ||
1466 | /* | |
1467 | * The length must be followed by a zero byte | |
1468 | */ | |
21666f1a | 1469 | return *hdr ? -1 : type_from_string(type); |
5180cacc LT |
1470 | } |
1471 | ||
7efbff75 | 1472 | static void *unpack_sha1_file(void *map, unsigned long mapsize, enum object_type *type, unsigned long *size, const unsigned char *sha1) |
0fcfd160 | 1473 | { |
5180cacc | 1474 | int ret; |
ef49a7a0 | 1475 | git_zstream stream; |
5180cacc | 1476 | char hdr[8192]; |
0fcfd160 | 1477 | |
5180cacc | 1478 | ret = unpack_sha1_header(&stream, map, mapsize, hdr, sizeof(hdr)); |
21666f1a | 1479 | if (ret < Z_OK || (*type = parse_sha1_header(hdr, size)) < 0) |
0fcfd160 LT |
1480 | return NULL; |
1481 | ||
7efbff75 | 1482 | return unpack_sha1_rest(&stream, hdr, *size, sha1); |
0fcfd160 LT |
1483 | } |
1484 | ||
54dab52a NP |
1485 | unsigned long get_size_from_delta(struct packed_git *p, |
1486 | struct pack_window **w_curs, | |
1487 | off_t curpos) | |
1488 | { | |
1489 | const unsigned char *data; | |
1490 | unsigned char delta_head[20], *in; | |
ef49a7a0 | 1491 | git_zstream stream; |
54dab52a NP |
1492 | int st; |
1493 | ||
1494 | memset(&stream, 0, sizeof(stream)); | |
1495 | stream.next_out = delta_head; | |
1496 | stream.avail_out = sizeof(delta_head); | |
1497 | ||
39c68542 | 1498 | git_inflate_init(&stream); |
54dab52a NP |
1499 | do { |
1500 | in = use_pack(p, w_curs, curpos, &stream.avail_in); | |
1501 | stream.next_in = in; | |
39c68542 | 1502 | st = git_inflate(&stream, Z_FINISH); |
54dab52a NP |
1503 | curpos += stream.next_in - in; |
1504 | } while ((st == Z_OK || st == Z_BUF_ERROR) && | |
1505 | stream.total_out < sizeof(delta_head)); | |
39c68542 | 1506 | git_inflate_end(&stream); |
3d77d877 NP |
1507 | if ((st != Z_STREAM_END) && stream.total_out != sizeof(delta_head)) { |
1508 | error("delta data unpack-initial failed"); | |
1509 | return 0; | |
1510 | } | |
54dab52a NP |
1511 | |
1512 | /* Examine the initial part of the delta to figure out | |
1513 | * the result size. | |
1514 | */ | |
1515 | data = delta_head; | |
1516 | ||
1517 | /* ignore base size */ | |
1518 | get_delta_hdr_size(&data, delta_head+sizeof(delta_head)); | |
1519 | ||
1520 | /* Read the result size */ | |
1521 | return get_delta_hdr_size(&data, delta_head+sizeof(delta_head)); | |
1522 | } | |
1523 | ||
c4001d92 | 1524 | static off_t get_delta_base(struct packed_git *p, |
03e79c88 | 1525 | struct pack_window **w_curs, |
c4001d92 | 1526 | off_t *curpos, |
21666f1a | 1527 | enum object_type type, |
c4001d92 | 1528 | off_t delta_obj_offset) |
eb32d236 | 1529 | { |
2b87c45b | 1530 | unsigned char *base_info = use_pack(p, w_curs, *curpos, NULL); |
c4001d92 | 1531 | off_t base_offset; |
eb32d236 | 1532 | |
8d8a4ea5 SP |
1533 | /* use_pack() assured us we have [base_info, base_info + 20) |
1534 | * as a range that we can look at without walking off the | |
1535 | * end of the mapped window. Its actually the hash size | |
1536 | * that is assured. An OFS_DELTA longer than the hash size | |
1537 | * is stupid, as then a REF_DELTA would be smaller to store. | |
1538 | */ | |
21666f1a | 1539 | if (type == OBJ_OFS_DELTA) { |
eb32d236 NP |
1540 | unsigned used = 0; |
1541 | unsigned char c = base_info[used++]; | |
1542 | base_offset = c & 127; | |
1543 | while (c & 128) { | |
1544 | base_offset += 1; | |
8723f216 | 1545 | if (!base_offset || MSB(base_offset, 7)) |
8eca0b47 | 1546 | return 0; /* overflow */ |
eb32d236 NP |
1547 | c = base_info[used++]; |
1548 | base_offset = (base_offset << 7) + (c & 127); | |
1549 | } | |
1550 | base_offset = delta_obj_offset - base_offset; | |
d8f32556 | 1551 | if (base_offset <= 0 || base_offset >= delta_obj_offset) |
8eca0b47 | 1552 | return 0; /* out of bound */ |
2b87c45b | 1553 | *curpos += used; |
21666f1a | 1554 | } else if (type == OBJ_REF_DELTA) { |
eb32d236 NP |
1555 | /* The base entry _must_ be in the same pack */ |
1556 | base_offset = find_pack_entry_one(base_info, p); | |
2b87c45b | 1557 | *curpos += 20; |
eb32d236 NP |
1558 | } else |
1559 | die("I am totally screwed"); | |
2b87c45b | 1560 | return base_offset; |
eb32d236 NP |
1561 | } |
1562 | ||
f8c8abc5 JH |
1563 | int unpack_object_header(struct packed_git *p, |
1564 | struct pack_window **w_curs, | |
1565 | off_t *curpos, | |
1566 | unsigned long *sizep) | |
a733cb60 | 1567 | { |
03e79c88 | 1568 | unsigned char *base; |
ef49a7a0 | 1569 | unsigned long left; |
ad1ed5ee | 1570 | unsigned long used; |
2b87c45b | 1571 | enum object_type type; |
a733cb60 | 1572 | |
8d8a4ea5 | 1573 | /* use_pack() assures us we have [base, base + 20) available |
0353a0c4 | 1574 | * as a range that we can look at. (Its actually the hash |
3dff5379 | 1575 | * size that is assured.) With our object header encoding |
8d8a4ea5 SP |
1576 | * the maximum deflated object size is 2^137, which is just |
1577 | * insane, so we know won't exceed what we have been given. | |
1578 | */ | |
2b87c45b | 1579 | base = use_pack(p, w_curs, *curpos, &left); |
09ded04b NP |
1580 | used = unpack_object_header_buffer(base, left, &type, sizep); |
1581 | if (!used) { | |
1582 | type = OBJ_BAD; | |
1583 | } else | |
1584 | *curpos += used; | |
ad1ed5ee | 1585 | |
2b87c45b | 1586 | return type; |
a733cb60 LT |
1587 | } |
1588 | ||
790d96c0 TR |
1589 | static int retry_bad_packed_offset(struct packed_git *p, off_t obj_offset) |
1590 | { | |
1591 | int type; | |
1592 | struct revindex_entry *revidx; | |
1593 | const unsigned char *sha1; | |
1594 | revidx = find_pack_revindex(p, obj_offset); | |
1595 | if (!revidx) | |
1596 | return OBJ_BAD; | |
1597 | sha1 = nth_packed_object_sha1(p, revidx->nr); | |
1598 | mark_bad_packed_object(p, sha1); | |
1599 | type = sha1_object_info(sha1, NULL); | |
1600 | if (type <= OBJ_NONE) | |
1601 | return OBJ_BAD; | |
1602 | return type; | |
1603 | } | |
1604 | ||
1605 | ||
1606 | #define POI_STACK_PREALLOC 64 | |
1607 | ||
c4001d92 | 1608 | static int packed_object_info(struct packed_git *p, off_t obj_offset, |
9a490590 | 1609 | unsigned long *sizep, int *rtype) |
1f688557 | 1610 | { |
03e79c88 | 1611 | struct pack_window *w_curs = NULL; |
c4001d92 SP |
1612 | unsigned long size; |
1613 | off_t curpos = obj_offset; | |
21666f1a | 1614 | enum object_type type; |
790d96c0 TR |
1615 | off_t small_poi_stack[POI_STACK_PREALLOC]; |
1616 | off_t *poi_stack = small_poi_stack; | |
1617 | int poi_stack_nr = 0, poi_stack_alloc = POI_STACK_PREALLOC; | |
5db47c2b | 1618 | |
21666f1a | 1619 | type = unpack_object_header(p, &w_curs, &curpos, &size); |
790d96c0 | 1620 | |
9a490590 JH |
1621 | if (rtype) |
1622 | *rtype = type; /* representation type */ | |
5db47c2b | 1623 | |
790d96c0 TR |
1624 | if (sizep) { |
1625 | if (type == OBJ_OFS_DELTA || type == OBJ_REF_DELTA) { | |
1626 | off_t tmp_pos = curpos; | |
1627 | off_t base_offset = get_delta_base(p, &w_curs, &tmp_pos, | |
1628 | type, obj_offset); | |
1629 | if (!base_offset) { | |
1630 | type = OBJ_BAD; | |
1631 | goto out; | |
1632 | } | |
1633 | *sizep = get_size_from_delta(p, &w_curs, tmp_pos); | |
1634 | if (*sizep == 0) { | |
1635 | type = OBJ_BAD; | |
1636 | goto out; | |
1637 | } | |
1638 | } else { | |
1639 | *sizep = size; | |
1640 | } | |
1641 | } | |
1642 | ||
1643 | while (type == OBJ_OFS_DELTA || type == OBJ_REF_DELTA) { | |
1644 | off_t base_offset; | |
1645 | /* Push the object we're going to leave behind */ | |
1646 | if (poi_stack_nr >= poi_stack_alloc && poi_stack == small_poi_stack) { | |
1647 | poi_stack_alloc = alloc_nr(poi_stack_nr); | |
1648 | poi_stack = xmalloc(sizeof(off_t)*poi_stack_alloc); | |
1649 | memcpy(poi_stack, small_poi_stack, sizeof(off_t)*poi_stack_nr); | |
1650 | } else { | |
1651 | ALLOC_GROW(poi_stack, poi_stack_nr+1, poi_stack_alloc); | |
1652 | } | |
1653 | poi_stack[poi_stack_nr++] = obj_offset; | |
1654 | /* If parsing the base offset fails, just unwind */ | |
1655 | base_offset = get_delta_base(p, &w_curs, &curpos, type, obj_offset); | |
1656 | if (!base_offset) | |
1657 | goto unwind; | |
1658 | curpos = obj_offset = base_offset; | |
1659 | type = unpack_object_header(p, &w_curs, &curpos, &size); | |
1660 | if (type <= OBJ_NONE) { | |
1661 | /* If getting the base itself fails, we first | |
1662 | * retry the base, otherwise unwind */ | |
1663 | type = retry_bad_packed_offset(p, base_offset); | |
1664 | if (type > OBJ_NONE) | |
1665 | goto out; | |
1666 | goto unwind; | |
1667 | } | |
1668 | } | |
1669 | ||
21666f1a | 1670 | switch (type) { |
790d96c0 | 1671 | case OBJ_BAD: |
a733cb60 | 1672 | case OBJ_COMMIT: |
a733cb60 | 1673 | case OBJ_TREE: |
a733cb60 | 1674 | case OBJ_BLOB: |
a733cb60 | 1675 | case OBJ_TAG: |
a69d0943 | 1676 | break; |
1f688557 | 1677 | default: |
3d77d877 NP |
1678 | error("unknown object type %i at offset %"PRIuMAX" in %s", |
1679 | type, (uintmax_t)obj_offset, p->pack_name); | |
1680 | type = OBJ_BAD; | |
1f688557 | 1681 | } |
790d96c0 TR |
1682 | |
1683 | out: | |
1684 | if (poi_stack != small_poi_stack) | |
1685 | free(poi_stack); | |
2b87c45b | 1686 | unuse_pack(&w_curs); |
21666f1a | 1687 | return type; |
790d96c0 TR |
1688 | |
1689 | unwind: | |
1690 | while (poi_stack_nr) { | |
1691 | obj_offset = poi_stack[--poi_stack_nr]; | |
1692 | type = retry_bad_packed_offset(p, obj_offset); | |
1693 | if (type > OBJ_NONE) | |
1694 | goto out; | |
1695 | } | |
1696 | type = OBJ_BAD; | |
1697 | goto out; | |
1f688557 JH |
1698 | } |
1699 | ||
eb950c19 | 1700 | static void *unpack_compressed_entry(struct packed_git *p, |
03e79c88 | 1701 | struct pack_window **w_curs, |
c4001d92 | 1702 | off_t curpos, |
eb950c19 | 1703 | unsigned long size) |
de530aaa SP |
1704 | { |
1705 | int st; | |
ef49a7a0 | 1706 | git_zstream stream; |
079afb18 | 1707 | unsigned char *buffer, *in; |
de530aaa | 1708 | |
4ab07e4d | 1709 | buffer = xmallocz(size); |
de530aaa | 1710 | memset(&stream, 0, sizeof(stream)); |
de530aaa | 1711 | stream.next_out = buffer; |
39eea7bd | 1712 | stream.avail_out = size + 1; |
de530aaa | 1713 | |
39c68542 | 1714 | git_inflate_init(&stream); |
079afb18 | 1715 | do { |
2b87c45b | 1716 | in = use_pack(p, w_curs, curpos, &stream.avail_in); |
079afb18 | 1717 | stream.next_in = in; |
39c68542 | 1718 | st = git_inflate(&stream, Z_FINISH); |
39eea7bd JH |
1719 | if (!stream.avail_out) |
1720 | break; /* the payload is larger than it should be */ | |
2b87c45b | 1721 | curpos += stream.next_in - in; |
079afb18 | 1722 | } while (st == Z_OK || st == Z_BUF_ERROR); |
39c68542 | 1723 | git_inflate_end(&stream); |
de530aaa SP |
1724 | if ((st != Z_STREAM_END) || stream.total_out != size) { |
1725 | free(buffer); | |
1726 | return NULL; | |
1727 | } | |
1728 | ||
1729 | return buffer; | |
1730 | } | |
1731 | ||
e5e01619 LT |
1732 | #define MAX_DELTA_CACHE (256) |
1733 | ||
18bdec11 | 1734 | static size_t delta_base_cached; |
5e08ecbf NP |
1735 | |
1736 | static struct delta_base_cache_lru_list { | |
1737 | struct delta_base_cache_lru_list *prev; | |
1738 | struct delta_base_cache_lru_list *next; | |
1739 | } delta_base_cache_lru = { &delta_base_cache_lru, &delta_base_cache_lru }; | |
1740 | ||
e5e01619 | 1741 | static struct delta_base_cache_entry { |
5e08ecbf NP |
1742 | struct delta_base_cache_lru_list lru; |
1743 | void *data; | |
e5e01619 LT |
1744 | struct packed_git *p; |
1745 | off_t base_offset; | |
1746 | unsigned long size; | |
e5e01619 LT |
1747 | enum object_type type; |
1748 | } delta_base_cache[MAX_DELTA_CACHE]; | |
1749 | ||
1750 | static unsigned long pack_entry_hash(struct packed_git *p, off_t base_offset) | |
1751 | { | |
1752 | unsigned long hash; | |
1753 | ||
1754 | hash = (unsigned long)p + (unsigned long)base_offset; | |
1755 | hash += (hash >> 8) + (hash >> 16); | |
3358004a | 1756 | return hash % MAX_DELTA_CACHE; |
e5e01619 LT |
1757 | } |
1758 | ||
84dd81c1 TR |
1759 | static struct delta_base_cache_entry * |
1760 | get_delta_base_cache_entry(struct packed_git *p, off_t base_offset) | |
5266d369 JH |
1761 | { |
1762 | unsigned long hash = pack_entry_hash(p, base_offset); | |
84dd81c1 TR |
1763 | return delta_base_cache + hash; |
1764 | } | |
1765 | ||
1766 | static int eq_delta_base_cache_entry(struct delta_base_cache_entry *ent, | |
1767 | struct packed_git *p, off_t base_offset) | |
1768 | { | |
5266d369 JH |
1769 | return (ent->data && ent->p == p && ent->base_offset == base_offset); |
1770 | } | |
1771 | ||
84dd81c1 TR |
1772 | static int in_delta_base_cache(struct packed_git *p, off_t base_offset) |
1773 | { | |
1774 | struct delta_base_cache_entry *ent; | |
1775 | ent = get_delta_base_cache_entry(p, base_offset); | |
1776 | return eq_delta_base_cache_entry(ent, p, base_offset); | |
1777 | } | |
1778 | ||
1779 | static void clear_delta_base_cache_entry(struct delta_base_cache_entry *ent) | |
1780 | { | |
1781 | ent->data = NULL; | |
1782 | ent->lru.next->prev = ent->lru.prev; | |
1783 | ent->lru.prev->next = ent->lru.next; | |
1784 | delta_base_cached -= ent->size; | |
1785 | } | |
1786 | ||
62f255ad | 1787 | static void *cache_or_unpack_entry(struct packed_git *p, off_t base_offset, |
a0cba108 | 1788 | unsigned long *base_size, enum object_type *type, int keep_cache) |
62f255ad | 1789 | { |
84dd81c1 | 1790 | struct delta_base_cache_entry *ent; |
e5e01619 | 1791 | void *ret; |
e5e01619 | 1792 | |
84dd81c1 TR |
1793 | ent = get_delta_base_cache_entry(p, base_offset); |
1794 | ||
1795 | if (!eq_delta_base_cache_entry(ent, p, base_offset)) | |
749bc58c | 1796 | return unpack_entry(p, base_offset, type, base_size); |
e5e01619 | 1797 | |
84dd81c1 TR |
1798 | ret = ent->data; |
1799 | ||
1800 | if (!keep_cache) | |
1801 | clear_delta_base_cache_entry(ent); | |
1802 | else | |
182af834 | 1803 | ret = xmemdupz(ent->data, ent->size); |
e5e01619 LT |
1804 | *type = ent->type; |
1805 | *base_size = ent->size; | |
1806 | return ret; | |
62f255ad LT |
1807 | } |
1808 | ||
18bdec11 SP |
1809 | static inline void release_delta_base_cache(struct delta_base_cache_entry *ent) |
1810 | { | |
1811 | if (ent->data) { | |
1812 | free(ent->data); | |
1813 | ent->data = NULL; | |
5e08ecbf NP |
1814 | ent->lru.next->prev = ent->lru.prev; |
1815 | ent->lru.prev->next = ent->lru.next; | |
18bdec11 SP |
1816 | delta_base_cached -= ent->size; |
1817 | } | |
1818 | } | |
1819 | ||
3d20c636 SP |
1820 | void clear_delta_base_cache(void) |
1821 | { | |
1822 | unsigned long p; | |
1823 | for (p = 0; p < MAX_DELTA_CACHE; p++) | |
1824 | release_delta_base_cache(&delta_base_cache[p]); | |
1825 | } | |
1826 | ||
62f255ad LT |
1827 | static void add_delta_base_cache(struct packed_git *p, off_t base_offset, |
1828 | void *base, unsigned long base_size, enum object_type type) | |
1829 | { | |
5e08ecbf | 1830 | unsigned long hash = pack_entry_hash(p, base_offset); |
e5e01619 | 1831 | struct delta_base_cache_entry *ent = delta_base_cache + hash; |
5e08ecbf | 1832 | struct delta_base_cache_lru_list *lru; |
e5e01619 | 1833 | |
18bdec11 SP |
1834 | release_delta_base_cache(ent); |
1835 | delta_base_cached += base_size; | |
5e08ecbf NP |
1836 | |
1837 | for (lru = delta_base_cache_lru.next; | |
1838 | delta_base_cached > delta_base_cache_limit | |
1839 | && lru != &delta_base_cache_lru; | |
1840 | lru = lru->next) { | |
1841 | struct delta_base_cache_entry *f = (void *)lru; | |
18bdec11 SP |
1842 | if (f->type == OBJ_BLOB) |
1843 | release_delta_base_cache(f); | |
1844 | } | |
5e08ecbf NP |
1845 | for (lru = delta_base_cache_lru.next; |
1846 | delta_base_cached > delta_base_cache_limit | |
1847 | && lru != &delta_base_cache_lru; | |
1848 | lru = lru->next) { | |
1849 | struct delta_base_cache_entry *f = (void *)lru; | |
1850 | release_delta_base_cache(f); | |
1851 | } | |
18bdec11 | 1852 | |
e5e01619 LT |
1853 | ent->p = p; |
1854 | ent->base_offset = base_offset; | |
1855 | ent->type = type; | |
1856 | ent->data = base; | |
1857 | ent->size = base_size; | |
5e08ecbf NP |
1858 | ent->lru.next = &delta_base_cache_lru; |
1859 | ent->lru.prev = delta_base_cache_lru.prev; | |
1860 | delta_base_cache_lru.prev->next = &ent->lru; | |
1861 | delta_base_cache_lru.prev = &ent->lru; | |
62f255ad LT |
1862 | } |
1863 | ||
c2c5b270 CC |
1864 | static void *read_object(const unsigned char *sha1, enum object_type *type, |
1865 | unsigned long *size); | |
1866 | ||
5f44324d JH |
1867 | static void write_pack_access_log(struct packed_git *p, off_t obj_offset) |
1868 | { | |
1869 | static FILE *log_file; | |
1870 | ||
1871 | if (!log_file) { | |
1872 | log_file = fopen(log_pack_access, "w"); | |
1873 | if (!log_file) { | |
1874 | error("cannot open pack access log '%s' for writing: %s", | |
1875 | log_pack_access, strerror(errno)); | |
1876 | log_pack_access = NULL; | |
1877 | return; | |
1878 | } | |
1879 | } | |
1880 | fprintf(log_file, "%s %"PRIuMAX"\n", | |
1881 | p->pack_name, (uintmax_t)obj_offset); | |
1882 | fflush(log_file); | |
1883 | } | |
1884 | ||
0e8189e2 NP |
1885 | int do_check_packed_object_crc; |
1886 | ||
abe601bb TR |
1887 | #define UNPACK_ENTRY_STACK_PREALLOC 64 |
1888 | struct unpack_entry_stack_ent { | |
1889 | off_t obj_offset; | |
1890 | off_t curpos; | |
1891 | unsigned long size; | |
1892 | }; | |
1893 | ||
c4001d92 | 1894 | void *unpack_entry(struct packed_git *p, off_t obj_offset, |
abe601bb | 1895 | enum object_type *final_type, unsigned long *final_size) |
1f688557 | 1896 | { |
03e79c88 | 1897 | struct pack_window *w_curs = NULL; |
c4001d92 | 1898 | off_t curpos = obj_offset; |
abe601bb TR |
1899 | void *data = NULL; |
1900 | unsigned long size; | |
1901 | enum object_type type; | |
1902 | struct unpack_entry_stack_ent small_delta_stack[UNPACK_ENTRY_STACK_PREALLOC]; | |
1903 | struct unpack_entry_stack_ent *delta_stack = small_delta_stack; | |
1904 | int delta_stack_nr = 0, delta_stack_alloc = UNPACK_ENTRY_STACK_PREALLOC; | |
1905 | int base_from_cache = 0; | |
1f688557 | 1906 | |
5f44324d JH |
1907 | if (log_pack_access) |
1908 | write_pack_access_log(p, obj_offset); | |
1909 | ||
abe601bb TR |
1910 | /* PHASE 1: drill down to the innermost base object */ |
1911 | for (;;) { | |
1912 | off_t base_offset; | |
1913 | int i; | |
1914 | struct delta_base_cache_entry *ent; | |
1915 | ||
1916 | if (do_check_packed_object_crc && p->index_version > 1) { | |
1917 | struct revindex_entry *revidx = find_pack_revindex(p, obj_offset); | |
1918 | unsigned long len = revidx[1].offset - obj_offset; | |
1919 | if (check_pack_crc(p, &w_curs, obj_offset, len, revidx->nr)) { | |
1920 | const unsigned char *sha1 = | |
1921 | nth_packed_object_sha1(p, revidx->nr); | |
1922 | error("bad packed object CRC for %s", | |
1923 | sha1_to_hex(sha1)); | |
1924 | mark_bad_packed_object(p, sha1); | |
1925 | unuse_pack(&w_curs); | |
1926 | return NULL; | |
1927 | } | |
1928 | } | |
1929 | ||
1930 | ent = get_delta_base_cache_entry(p, curpos); | |
1931 | if (eq_delta_base_cache_entry(ent, p, curpos)) { | |
1932 | type = ent->type; | |
1933 | data = ent->data; | |
1934 | size = ent->size; | |
1935 | clear_delta_base_cache_entry(ent); | |
1936 | base_from_cache = 1; | |
1937 | break; | |
0e8189e2 | 1938 | } |
abe601bb TR |
1939 | |
1940 | type = unpack_object_header(p, &w_curs, &curpos, &size); | |
1941 | if (type != OBJ_OFS_DELTA && type != OBJ_REF_DELTA) | |
1942 | break; | |
1943 | ||
1944 | base_offset = get_delta_base(p, &w_curs, &curpos, type, obj_offset); | |
1945 | if (!base_offset) { | |
1946 | error("failed to validate delta base reference " | |
1947 | "at offset %"PRIuMAX" from %s", | |
1948 | (uintmax_t)curpos, p->pack_name); | |
1949 | /* bail to phase 2, in hopes of recovery */ | |
1950 | data = NULL; | |
1951 | break; | |
1952 | } | |
1953 | ||
1954 | /* push object, proceed to base */ | |
1955 | if (delta_stack_nr >= delta_stack_alloc | |
1956 | && delta_stack == small_delta_stack) { | |
1957 | delta_stack_alloc = alloc_nr(delta_stack_nr); | |
1958 | delta_stack = xmalloc(sizeof(*delta_stack)*delta_stack_alloc); | |
1959 | memcpy(delta_stack, small_delta_stack, | |
1960 | sizeof(*delta_stack)*delta_stack_nr); | |
1961 | } else { | |
1962 | ALLOC_GROW(delta_stack, delta_stack_nr+1, delta_stack_alloc); | |
1963 | } | |
1964 | i = delta_stack_nr++; | |
1965 | delta_stack[i].obj_offset = obj_offset; | |
1966 | delta_stack[i].curpos = curpos; | |
1967 | delta_stack[i].size = size; | |
1968 | ||
1969 | curpos = obj_offset = base_offset; | |
0e8189e2 NP |
1970 | } |
1971 | ||
abe601bb TR |
1972 | /* PHASE 2: handle the base */ |
1973 | switch (type) { | |
eb32d236 NP |
1974 | case OBJ_OFS_DELTA: |
1975 | case OBJ_REF_DELTA: | |
abe601bb TR |
1976 | if (data) |
1977 | die("BUG in unpack_entry: left loop at a valid delta"); | |
4d703a1a | 1978 | break; |
a733cb60 | 1979 | case OBJ_COMMIT: |
a733cb60 | 1980 | case OBJ_TREE: |
a733cb60 | 1981 | case OBJ_BLOB: |
a733cb60 | 1982 | case OBJ_TAG: |
abe601bb TR |
1983 | if (!base_from_cache) |
1984 | data = unpack_compressed_entry(p, &w_curs, curpos, size); | |
4d703a1a | 1985 | break; |
1f688557 | 1986 | default: |
8eca0b47 NP |
1987 | data = NULL; |
1988 | error("unknown object type %i at offset %"PRIuMAX" in %s", | |
abe601bb TR |
1989 | type, (uintmax_t)obj_offset, p->pack_name); |
1990 | } | |
1991 | ||
1992 | /* PHASE 3: apply deltas in order */ | |
1993 | ||
1994 | /* invariants: | |
1995 | * 'data' holds the base data, or NULL if there was corruption | |
1996 | */ | |
1997 | while (delta_stack_nr) { | |
1998 | void *delta_data; | |
1999 | void *base = data; | |
2000 | unsigned long delta_size, base_size = size; | |
2001 | int i; | |
2002 | ||
2003 | data = NULL; | |
2004 | ||
2005 | if (base) | |
2006 | add_delta_base_cache(p, obj_offset, base, base_size, type); | |
2007 | ||
2008 | if (!base) { | |
2009 | /* | |
2010 | * We're probably in deep shit, but let's try to fetch | |
2011 | * the required base anyway from another pack or loose. | |
2012 | * This is costly but should happen only in the presence | |
2013 | * of a corrupted pack, and is better than failing outright. | |
2014 | */ | |
2015 | struct revindex_entry *revidx; | |
2016 | const unsigned char *base_sha1; | |
2017 | revidx = find_pack_revindex(p, obj_offset); | |
2018 | if (revidx) { | |
2019 | base_sha1 = nth_packed_object_sha1(p, revidx->nr); | |
2020 | error("failed to read delta base object %s" | |
2021 | " at offset %"PRIuMAX" from %s", | |
2022 | sha1_to_hex(base_sha1), (uintmax_t)obj_offset, | |
2023 | p->pack_name); | |
2024 | mark_bad_packed_object(p, base_sha1); | |
2025 | base = read_object(base_sha1, &type, &base_size); | |
2026 | } | |
2027 | } | |
2028 | ||
2029 | i = --delta_stack_nr; | |
2030 | obj_offset = delta_stack[i].obj_offset; | |
2031 | curpos = delta_stack[i].curpos; | |
2032 | delta_size = delta_stack[i].size; | |
2033 | ||
2034 | if (!base) | |
2035 | continue; | |
2036 | ||
2037 | delta_data = unpack_compressed_entry(p, &w_curs, curpos, delta_size); | |
2038 | ||
2039 | if (!delta_data) { | |
2040 | error("failed to unpack compressed delta " | |
2041 | "at offset %"PRIuMAX" from %s", | |
2042 | (uintmax_t)curpos, p->pack_name); | |
2043 | free(base); | |
2044 | data = NULL; | |
2045 | continue; | |
2046 | } | |
2047 | ||
2048 | data = patch_delta(base, base_size, | |
2049 | delta_data, delta_size, | |
2050 | &size); | |
2051 | if (!data) | |
2052 | die("failed to apply delta"); | |
2053 | ||
2054 | free (delta_data); | |
1f688557 | 2055 | } |
abe601bb TR |
2056 | |
2057 | *final_type = type; | |
2058 | *final_size = size; | |
2059 | ||
03e79c88 | 2060 | unuse_pack(&w_curs); |
21666f1a | 2061 | return data; |
1f688557 JH |
2062 | } |
2063 | ||
d079837e | 2064 | const unsigned char *nth_packed_object_sha1(struct packed_git *p, |
d72308e0 | 2065 | uint32_t n) |
9a217f2a | 2066 | { |
42873078 | 2067 | const unsigned char *index = p->index_data; |
d079837e SP |
2068 | if (!index) { |
2069 | if (open_pack_index(p)) | |
2070 | return NULL; | |
2071 | index = p->index_data; | |
2072 | } | |
57059091 | 2073 | if (n >= p->num_objects) |
d72308e0 | 2074 | return NULL; |
74e34e1f NP |
2075 | index += 4 * 256; |
2076 | if (p->index_version == 1) { | |
2077 | return index + 24 * n + 4; | |
2078 | } else { | |
2079 | index += 8; | |
2080 | return index + 20 * n; | |
2081 | } | |
2082 | } | |
2083 | ||
99093238 | 2084 | off_t nth_packed_object_offset(const struct packed_git *p, uint32_t n) |
74e34e1f NP |
2085 | { |
2086 | const unsigned char *index = p->index_data; | |
2087 | index += 4 * 256; | |
2088 | if (p->index_version == 1) { | |
2089 | return ntohl(*((uint32_t *)(index + 24 * n))); | |
2090 | } else { | |
2091 | uint32_t off; | |
2092 | index += 8 + p->num_objects * (20 + 4); | |
2093 | off = ntohl(*((uint32_t *)(index + 4 * n))); | |
2094 | if (!(off & 0x80000000)) | |
2095 | return off; | |
2096 | index += p->num_objects * 4 + (off & 0x7fffffff) * 8; | |
2097 | return (((uint64_t)ntohl(*((uint32_t *)(index + 0)))) << 32) | | |
2098 | ntohl(*((uint32_t *)(index + 4))); | |
2099 | } | |
9a217f2a JH |
2100 | } |
2101 | ||
c4001d92 | 2102 | off_t find_pack_entry_one(const unsigned char *sha1, |
43057304 | 2103 | struct packed_git *p) |
1f688557 | 2104 | { |
42873078 | 2105 | const uint32_t *level1_ofs = p->index_data; |
42873078 | 2106 | const unsigned char *index = p->index_data; |
628522ec JH |
2107 | unsigned hi, lo, stride; |
2108 | static int use_lookup = -1; | |
2109 | static int debug_lookup = -1; | |
2110 | ||
2111 | if (debug_lookup < 0) | |
2112 | debug_lookup = !!getenv("GIT_DEBUG_LOOKUP"); | |
42873078 | 2113 | |
d079837e SP |
2114 | if (!index) { |
2115 | if (open_pack_index(p)) | |
2116 | return 0; | |
2117 | level1_ofs = p->index_data; | |
2118 | index = p->index_data; | |
2119 | } | |
74e34e1f NP |
2120 | if (p->index_version > 1) { |
2121 | level1_ofs += 2; | |
2122 | index += 8; | |
2123 | } | |
42873078 | 2124 | index += 4 * 256; |
74e34e1f NP |
2125 | hi = ntohl(level1_ofs[*sha1]); |
2126 | lo = ((*sha1 == 0x0) ? 0 : ntohl(level1_ofs[*sha1 - 1])); | |
628522ec JH |
2127 | if (p->index_version > 1) { |
2128 | stride = 20; | |
2129 | } else { | |
2130 | stride = 24; | |
2131 | index += 4; | |
2132 | } | |
2133 | ||
2134 | if (debug_lookup) | |
6e1c2344 | 2135 | printf("%02x%02x%02x... lo %u hi %u nr %"PRIu32"\n", |
628522ec JH |
2136 | sha1[0], sha1[1], sha1[2], lo, hi, p->num_objects); |
2137 | ||
2138 | if (use_lookup < 0) | |
2139 | use_lookup = !!getenv("GIT_USE_LOOKUP"); | |
2140 | if (use_lookup) { | |
2141 | int pos = sha1_entry_pos(index, stride, 0, | |
2142 | lo, hi, p->num_objects, sha1); | |
2143 | if (pos < 0) | |
2144 | return 0; | |
2145 | return nth_packed_object_offset(p, pos); | |
2146 | } | |
1f688557 JH |
2147 | |
2148 | do { | |
74e34e1f | 2149 | unsigned mi = (lo + hi) / 2; |
628522ec JH |
2150 | int cmp = hashcmp(index + mi * stride, sha1); |
2151 | ||
2152 | if (debug_lookup) | |
2153 | printf("lo %u hi %u rg %u mi %u\n", | |
2154 | lo, hi, hi - lo, mi); | |
43057304 | 2155 | if (!cmp) |
74e34e1f | 2156 | return nth_packed_object_offset(p, mi); |
1f688557 JH |
2157 | if (cmp > 0) |
2158 | hi = mi; | |
2159 | else | |
2160 | lo = mi+1; | |
2161 | } while (lo < hi); | |
2162 | return 0; | |
2163 | } | |
2164 | ||
4c080182 | 2165 | int is_pack_valid(struct packed_git *p) |
d131b7af SP |
2166 | { |
2167 | /* An already open pack is known to be valid. */ | |
2168 | if (p->pack_fd != -1) | |
2169 | return 1; | |
2170 | ||
2171 | /* If the pack has one window completely covering the | |
2172 | * file size, the pack is known to be valid even if | |
2173 | * the descriptor is not currently open. | |
2174 | */ | |
2175 | if (p->windows) { | |
2176 | struct pack_window *w = p->windows; | |
2177 | ||
2178 | if (!w->offset && w->len == p->pack_size) | |
2179 | return 1; | |
2180 | } | |
2181 | ||
2182 | /* Force the pack to open to prove its valid. */ | |
2183 | return !open_packed_git(p); | |
2184 | } | |
2185 | ||
95099731 NTND |
2186 | static int fill_pack_entry(const unsigned char *sha1, |
2187 | struct pack_entry *e, | |
2188 | struct packed_git *p) | |
2189 | { | |
2190 | off_t offset; | |
2191 | ||
2192 | if (p->num_bad_objects) { | |
2193 | unsigned i; | |
2194 | for (i = 0; i < p->num_bad_objects; i++) | |
2195 | if (!hashcmp(sha1, p->bad_object_sha1 + 20 * i)) | |
2196 | return 0; | |
2197 | } | |
2198 | ||
2199 | offset = find_pack_entry_one(sha1, p); | |
2200 | if (!offset) | |
2201 | return 0; | |
2202 | ||
2203 | /* | |
2204 | * We are about to tell the caller where they can locate the | |
2205 | * requested object. We better make sure the packfile is | |
2206 | * still here and can be accessed before supplying that | |
2207 | * answer, as it may have been deleted since the index was | |
2208 | * loaded! | |
2209 | */ | |
2210 | if (!is_pack_valid(p)) { | |
2211 | warning("packfile %s cannot be accessed", p->pack_name); | |
2212 | return 0; | |
2213 | } | |
2214 | e->offset = offset; | |
2215 | e->p = p; | |
2216 | hashcpy(e->sha1, sha1); | |
2217 | return 1; | |
2218 | } | |
2219 | ||
4d6acb70 | 2220 | static int find_pack_entry(const unsigned char *sha1, struct pack_entry *e) |
1f688557 JH |
2221 | { |
2222 | struct packed_git *p; | |
43057304 | 2223 | |
1f688557 | 2224 | prepare_packed_git(); |
f7c22cc6 NP |
2225 | if (!packed_git) |
2226 | return 0; | |
1f688557 | 2227 | |
c01f51cc NTND |
2228 | if (last_found_pack && fill_pack_entry(sha1, e, last_found_pack)) |
2229 | return 1; | |
8eca0b47 | 2230 | |
c01f51cc NTND |
2231 | for (p = packed_git; p; p = p->next) { |
2232 | if (p == last_found_pack || !fill_pack_entry(sha1, e, p)) | |
2233 | continue; | |
f7c22cc6 | 2234 | |
c01f51cc NTND |
2235 | last_found_pack = p; |
2236 | return 1; | |
2237 | } | |
1f688557 JH |
2238 | return 0; |
2239 | } | |
2240 | ||
a6080a0a | 2241 | struct packed_git *find_sha1_pack(const unsigned char *sha1, |
bf592c50 DB |
2242 | struct packed_git *packs) |
2243 | { | |
2244 | struct packed_git *p; | |
bf592c50 DB |
2245 | |
2246 | for (p = packs; p; p = p->next) { | |
43057304 | 2247 | if (find_pack_entry_one(sha1, p)) |
bf592c50 DB |
2248 | return p; |
2249 | } | |
2250 | return NULL; | |
21666f1a | 2251 | |
bf592c50 DB |
2252 | } |
2253 | ||
21666f1a | 2254 | static int sha1_loose_object_info(const unsigned char *sha1, unsigned long *sizep) |
65c2e0c3 | 2255 | { |
36e4d74a | 2256 | int status; |
65c2e0c3 JH |
2257 | unsigned long mapsize, size; |
2258 | void *map; | |
ef49a7a0 | 2259 | git_zstream stream; |
d65a16f6 | 2260 | char hdr[32]; |
65c2e0c3 | 2261 | |
bb6b8e4f | 2262 | map = map_sha1_file(sha1, &mapsize); |
f0df4ed5 JS |
2263 | if (!map) |
2264 | return error("unable to find %s", sha1_to_hex(sha1)); | |
36e4d74a JH |
2265 | if (unpack_sha1_header(&stream, map, mapsize, hdr, sizeof(hdr)) < 0) |
2266 | status = error("unable to unpack %s header", | |
2267 | sha1_to_hex(sha1)); | |
21666f1a | 2268 | else if ((status = parse_sha1_header(hdr, &size)) < 0) |
36e4d74a | 2269 | status = error("unable to parse %s header", sha1_to_hex(sha1)); |
21666f1a NP |
2270 | else if (sizep) |
2271 | *sizep = size; | |
39c68542 | 2272 | git_inflate_end(&stream); |
65c2e0c3 JH |
2273 | munmap(map, mapsize); |
2274 | return status; | |
2275 | } | |
2276 | ||
9a490590 JH |
2277 | /* returns enum object_type or negative */ |
2278 | int sha1_object_info_extended(const unsigned char *sha1, struct object_info *oi) | |
f0df4ed5 | 2279 | { |
c4d9986f | 2280 | struct cached_object *co; |
f0df4ed5 | 2281 | struct pack_entry e; |
9a490590 | 2282 | int status, rtype; |
f0df4ed5 | 2283 | |
c4d9986f NTND |
2284 | co = find_cached_object(sha1); |
2285 | if (co) { | |
9a490590 JH |
2286 | if (oi->sizep) |
2287 | *(oi->sizep) = co->size; | |
2288 | oi->whence = OI_CACHED; | |
c4d9986f NTND |
2289 | return co->type; |
2290 | } | |
2291 | ||
cd673c1f | 2292 | if (!find_pack_entry(sha1, &e)) { |
ddd63e64 | 2293 | /* Most likely it's a loose object. */ |
9a490590 JH |
2294 | status = sha1_loose_object_info(sha1, oi->sizep); |
2295 | if (status >= 0) { | |
2296 | oi->whence = OI_LOOSE; | |
ddd63e64 | 2297 | return status; |
9a490590 | 2298 | } |
ddd63e64 SG |
2299 | |
2300 | /* Not a loose object; someone else may have just packed it. */ | |
f0df4ed5 | 2301 | reprepare_packed_git(); |
cd673c1f | 2302 | if (!find_pack_entry(sha1, &e)) |
ddd63e64 | 2303 | return status; |
f0df4ed5 | 2304 | } |
3d77d877 | 2305 | |
9a490590 | 2306 | status = packed_object_info(e.p, e.offset, oi->sizep, &rtype); |
3d77d877 NP |
2307 | if (status < 0) { |
2308 | mark_bad_packed_object(e.p, sha1); | |
9a490590 | 2309 | status = sha1_object_info_extended(sha1, oi); |
5266d369 JH |
2310 | } else if (in_delta_base_cache(e.p, e.offset)) { |
2311 | oi->whence = OI_DBCACHED; | |
9a490590 JH |
2312 | } else { |
2313 | oi->whence = OI_PACKED; | |
2314 | oi->u.packed.offset = e.offset; | |
2315 | oi->u.packed.pack = e.p; | |
2316 | oi->u.packed.is_delta = (rtype == OBJ_REF_DELTA || | |
2317 | rtype == OBJ_OFS_DELTA); | |
3d77d877 NP |
2318 | } |
2319 | ||
2320 | return status; | |
f0df4ed5 JS |
2321 | } |
2322 | ||
9a490590 JH |
2323 | int sha1_object_info(const unsigned char *sha1, unsigned long *sizep) |
2324 | { | |
2325 | struct object_info oi; | |
2326 | ||
2327 | oi.sizep = sizep; | |
2328 | return sha1_object_info_extended(sha1, &oi); | |
2329 | } | |
2330 | ||
21666f1a NP |
2331 | static void *read_packed_sha1(const unsigned char *sha1, |
2332 | enum object_type *type, unsigned long *size) | |
1f688557 JH |
2333 | { |
2334 | struct pack_entry e; | |
8eca0b47 | 2335 | void *data; |
1f688557 | 2336 | |
cd673c1f | 2337 | if (!find_pack_entry(sha1, &e)) |
1f688557 | 2338 | return NULL; |
8eca0b47 NP |
2339 | data = cache_or_unpack_entry(e.p, e.offset, size, type, 1); |
2340 | if (!data) { | |
2341 | /* | |
2342 | * We're probably in deep shit, but let's try to fetch | |
2343 | * the required object anyway from another pack or loose. | |
2344 | * This should happen only in the presence of a corrupted | |
2345 | * pack, and is better than failing outright. | |
2346 | */ | |
2347 | error("failed to read object %s at offset %"PRIuMAX" from %s", | |
2348 | sha1_to_hex(sha1), (uintmax_t)e.offset, e.p->pack_name); | |
2349 | mark_bad_packed_object(e.p, sha1); | |
ac939109 | 2350 | data = read_object(sha1, type, size); |
8eca0b47 NP |
2351 | } |
2352 | return data; | |
1f688557 JH |
2353 | } |
2354 | ||
21666f1a NP |
2355 | int pretend_sha1_file(void *buf, unsigned long len, enum object_type type, |
2356 | unsigned char *sha1) | |
d66b37bb JH |
2357 | { |
2358 | struct cached_object *co; | |
2359 | ||
21666f1a | 2360 | hash_sha1_file(buf, len, typename(type), sha1); |
d66b37bb JH |
2361 | if (has_sha1_file(sha1) || find_cached_object(sha1)) |
2362 | return 0; | |
2363 | if (cached_object_alloc <= cached_object_nr) { | |
2364 | cached_object_alloc = alloc_nr(cached_object_alloc); | |
2365 | cached_objects = xrealloc(cached_objects, | |
2366 | sizeof(*cached_objects) * | |
2367 | cached_object_alloc); | |
2368 | } | |
2369 | co = &cached_objects[cached_object_nr++]; | |
2370 | co->size = len; | |
21666f1a | 2371 | co->type = type; |
efa13f7b JH |
2372 | co->buf = xmalloc(len); |
2373 | memcpy(co->buf, buf, len); | |
d66b37bb JH |
2374 | hashcpy(co->sha1, sha1); |
2375 | return 0; | |
2376 | } | |
2377 | ||
c2c5b270 CC |
2378 | static void *read_object(const unsigned char *sha1, enum object_type *type, |
2379 | unsigned long *size) | |
0fcfd160 LT |
2380 | { |
2381 | unsigned long mapsize; | |
2382 | void *map, *buf; | |
d66b37bb JH |
2383 | struct cached_object *co; |
2384 | ||
2385 | co = find_cached_object(sha1); | |
2386 | if (co) { | |
21666f1a | 2387 | *type = co->type; |
d66b37bb | 2388 | *size = co->size; |
182af834 | 2389 | return xmemdupz(co->buf, co->size); |
d66b37bb | 2390 | } |
0fcfd160 | 2391 | |
8276c007 PE |
2392 | buf = read_packed_sha1(sha1, type, size); |
2393 | if (buf) | |
2394 | return buf; | |
bb6b8e4f | 2395 | map = map_sha1_file(sha1, &mapsize); |
0fcfd160 | 2396 | if (map) { |
7efbff75 | 2397 | buf = unpack_sha1_file(map, mapsize, type, size, sha1); |
0fcfd160 LT |
2398 | munmap(map, mapsize); |
2399 | return buf; | |
2400 | } | |
637cdd9d | 2401 | reprepare_packed_git(); |
8276c007 | 2402 | return read_packed_sha1(sha1, type, size); |
0fcfd160 LT |
2403 | } |
2404 | ||
b6c4cecc JH |
2405 | /* |
2406 | * This function dies on corrupt objects; the callers who want to | |
2407 | * deal with them should arrange to call read_object() and give error | |
2408 | * messages themselves. | |
2409 | */ | |
5bf29b95 JH |
2410 | void *read_sha1_file_extended(const unsigned char *sha1, |
2411 | enum object_type *type, | |
2412 | unsigned long *size, | |
2413 | unsigned flag) | |
ac939109 | 2414 | { |
3ba7a065 | 2415 | void *data; |
e8b15e61 | 2416 | char *path; |
b6c4cecc | 2417 | const struct packed_git *p; |
5bf29b95 JH |
2418 | const unsigned char *repl = (flag & READ_SHA1_FILE_REPLACE) |
2419 | ? lookup_replace_object(sha1) : sha1; | |
b6c4cecc | 2420 | |
3ba7a065 JH |
2421 | errno = 0; |
2422 | data = read_object(repl, type, size); | |
4bbf5a26 | 2423 | if (data) |
b6c4cecc | 2424 | return data; |
68095570 | 2425 | |
25f3af3f | 2426 | if (errno && errno != ENOENT) |
3ba7a065 JH |
2427 | die_errno("failed to read object %s", sha1_to_hex(sha1)); |
2428 | ||
68095570 | 2429 | /* die if we replaced an object with one that does not exist */ |
b6c4cecc | 2430 | if (repl != sha1) |
68095570 CC |
2431 | die("replacement %s not found for %s", |
2432 | sha1_to_hex(repl), sha1_to_hex(sha1)); | |
2433 | ||
b6c4cecc JH |
2434 | if (has_loose_object(repl)) { |
2435 | path = sha1_file_name(sha1); | |
2436 | die("loose object %s (stored in %s) is corrupt", | |
2437 | sha1_to_hex(repl), path); | |
e8b15e61 | 2438 | } |
68095570 | 2439 | |
b6c4cecc JH |
2440 | if ((p = has_packed_and_bad(repl)) != NULL) |
2441 | die("packed object %s (stored in %s) is corrupt", | |
2442 | sha1_to_hex(repl), p->pack_name); | |
f5552aee | 2443 | |
b6c4cecc | 2444 | return NULL; |
ac939109 NP |
2445 | } |
2446 | ||
40469ee9 | 2447 | void *read_object_with_reference(const unsigned char *sha1, |
21666f1a | 2448 | const char *required_type_name, |
40469ee9 JH |
2449 | unsigned long *size, |
2450 | unsigned char *actual_sha1_return) | |
f4913f91 | 2451 | { |
21666f1a | 2452 | enum object_type type, required_type; |
f4913f91 JH |
2453 | void *buffer; |
2454 | unsigned long isize; | |
40469ee9 | 2455 | unsigned char actual_sha1[20]; |
f4913f91 | 2456 | |
21666f1a | 2457 | required_type = type_from_string(required_type_name); |
e702496e | 2458 | hashcpy(actual_sha1, sha1); |
40469ee9 JH |
2459 | while (1) { |
2460 | int ref_length = -1; | |
2461 | const char *ref_type = NULL; | |
f4913f91 | 2462 | |
21666f1a | 2463 | buffer = read_sha1_file(actual_sha1, &type, &isize); |
40469ee9 JH |
2464 | if (!buffer) |
2465 | return NULL; | |
21666f1a | 2466 | if (type == required_type) { |
40469ee9 JH |
2467 | *size = isize; |
2468 | if (actual_sha1_return) | |
e702496e | 2469 | hashcpy(actual_sha1_return, actual_sha1); |
40469ee9 JH |
2470 | return buffer; |
2471 | } | |
2472 | /* Handle references */ | |
21666f1a | 2473 | else if (type == OBJ_COMMIT) |
40469ee9 | 2474 | ref_type = "tree "; |
21666f1a | 2475 | else if (type == OBJ_TAG) |
40469ee9 JH |
2476 | ref_type = "object "; |
2477 | else { | |
2478 | free(buffer); | |
2479 | return NULL; | |
2480 | } | |
2481 | ref_length = strlen(ref_type); | |
f4913f91 | 2482 | |
50974ec9 MK |
2483 | if (ref_length + 40 > isize || |
2484 | memcmp(buffer, ref_type, ref_length) || | |
1d7f171c | 2485 | get_sha1_hex((char *) buffer + ref_length, actual_sha1)) { |
40469ee9 JH |
2486 | free(buffer); |
2487 | return NULL; | |
2488 | } | |
1cf58e72 | 2489 | free(buffer); |
40469ee9 JH |
2490 | /* Now we have the ID of the referred-to object in |
2491 | * actual_sha1. Check again. */ | |
f4913f91 | 2492 | } |
f4913f91 JH |
2493 | } |
2494 | ||
ce9fbf16 | 2495 | static void write_sha1_file_prepare(const void *buf, unsigned long len, |
972a9155 | 2496 | const char *type, unsigned char *sha1, |
d65a16f6 | 2497 | char *hdr, int *hdrlen) |
d410c0f5 | 2498 | { |
9126f009 | 2499 | git_SHA_CTX c; |
d410c0f5 JH |
2500 | |
2501 | /* Generate the header */ | |
d65a16f6 | 2502 | *hdrlen = sprintf(hdr, "%s %lu", type, len)+1; |
d410c0f5 JH |
2503 | |
2504 | /* Sha1.. */ | |
9126f009 NP |
2505 | git_SHA1_Init(&c); |
2506 | git_SHA1_Update(&c, hdr, *hdrlen); | |
2507 | git_SHA1_Update(&c, buf, len); | |
2508 | git_SHA1_Final(sha1, &c); | |
d410c0f5 JH |
2509 | } |
2510 | ||
230f1322 | 2511 | /* |
5a688fe4 JH |
2512 | * Move the just written object into its final resting place. |
2513 | * NEEDSWORK: this should be renamed to finalize_temp_file() as | |
2514 | * "moving" is only a part of what it does, when no patch between | |
2515 | * master to pu changes the call sites of this function. | |
230f1322 | 2516 | */ |
839837b9 | 2517 | int move_temp_to_file(const char *tmpfile, const char *filename) |
230f1322 | 2518 | { |
e32c0a9c | 2519 | int ret = 0; |
5a688fe4 | 2520 | |
348df166 | 2521 | if (object_creation_mode == OBJECT_CREATION_USES_RENAMES) |
be66a6c4 JS |
2522 | goto try_rename; |
2523 | else if (link(tmpfile, filename)) | |
e32c0a9c | 2524 | ret = errno; |
7ebb6fca LT |
2525 | |
2526 | /* | |
2527 | * Coda hack - coda doesn't like cross-directory links, | |
2528 | * so we fall back to a rename, which will mean that it | |
2529 | * won't be able to check collisions, but that's not a | |
2530 | * big deal. | |
2531 | * | |
2532 | * The same holds for FAT formatted media. | |
2533 | * | |
3be1f18e | 2534 | * When this succeeds, we just return. We have nothing |
7ebb6fca LT |
2535 | * left to unlink. |
2536 | */ | |
2537 | if (ret && ret != EEXIST) { | |
be66a6c4 | 2538 | try_rename: |
7ebb6fca | 2539 | if (!rename(tmpfile, filename)) |
3be1f18e | 2540 | goto out; |
9e48b389 | 2541 | ret = errno; |
230f1322 | 2542 | } |
691f1a28 | 2543 | unlink_or_warn(tmpfile); |
230f1322 LT |
2544 | if (ret) { |
2545 | if (ret != EEXIST) { | |
82247e9b | 2546 | return error("unable to write sha1 filename %s: %s", filename, strerror(ret)); |
230f1322 LT |
2547 | } |
2548 | /* FIXME!!! Collision check here ? */ | |
2549 | } | |
2550 | ||
3be1f18e | 2551 | out: |
5256b006 | 2552 | if (adjust_shared_perm(filename)) |
5a688fe4 | 2553 | return error("unable to set permission to '%s'", filename); |
230f1322 LT |
2554 | return 0; |
2555 | } | |
2556 | ||
4d548150 LT |
2557 | static int write_buffer(int fd, const void *buf, size_t len) |
2558 | { | |
d34cf19b | 2559 | if (write_in_full(fd, buf, len) < 0) |
93822c22 | 2560 | return error("file write error (%s)", strerror(errno)); |
4d548150 LT |
2561 | return 0; |
2562 | } | |
2563 | ||
ce9fbf16 | 2564 | int hash_sha1_file(const void *buf, unsigned long len, const char *type, |
abdc3fc8 RS |
2565 | unsigned char *sha1) |
2566 | { | |
d65a16f6 | 2567 | char hdr[32]; |
abdc3fc8 RS |
2568 | int hdrlen; |
2569 | write_sha1_file_prepare(buf, len, type, sha1, hdr, &hdrlen); | |
2570 | return 0; | |
2571 | } | |
2572 | ||
e9039dd3 LT |
2573 | /* Finalize a file on disk, and close it. */ |
2574 | static void close_sha1_file(int fd) | |
2575 | { | |
aafe9fba LT |
2576 | if (fsync_object_files) |
2577 | fsync_or_die(fd, "sha1 file"); | |
e9039dd3 | 2578 | if (close(fd) != 0) |
d824cbba | 2579 | die_errno("error when closing sha1 file"); |
e9039dd3 LT |
2580 | } |
2581 | ||
5723fe7e LT |
2582 | /* Size of directory component, including the ending '/' */ |
2583 | static inline int directory_size(const char *filename) | |
2584 | { | |
2585 | const char *s = strrchr(filename, '/'); | |
2586 | if (!s) | |
2587 | return 0; | |
2588 | return s - filename + 1; | |
2589 | } | |
2590 | ||
2591 | /* | |
2592 | * This creates a temporary file in the same directory as the final | |
2593 | * 'filename' | |
2594 | * | |
2595 | * We want to avoid cross-directory filename renames, because those | |
2596 | * can have problems on various filesystems (FAT, NFS, Coda). | |
2597 | */ | |
2598 | static int create_tmpfile(char *buffer, size_t bufsiz, const char *filename) | |
2599 | { | |
2600 | int fd, dirlen = directory_size(filename); | |
2601 | ||
2602 | if (dirlen + 20 > bufsiz) { | |
2603 | errno = ENAMETOOLONG; | |
2604 | return -1; | |
2605 | } | |
2606 | memcpy(buffer, filename, dirlen); | |
2607 | strcpy(buffer + dirlen, "tmp_obj_XXXXXX"); | |
5256b006 | 2608 | fd = git_mkstemp_mode(buffer, 0444); |
cbacbf4e | 2609 | if (fd < 0 && dirlen && errno == ENOENT) { |
5723fe7e | 2610 | /* Make sure the directory exists */ |
6ff6af62 | 2611 | memcpy(buffer, filename, dirlen); |
5723fe7e | 2612 | buffer[dirlen-1] = 0; |
3bfaf018 | 2613 | if (mkdir(buffer, 0777) || adjust_shared_perm(buffer)) |
5723fe7e LT |
2614 | return -1; |
2615 | ||
2616 | /* Try again */ | |
2617 | strcpy(buffer + dirlen - 1, "/tmp_obj_XXXXXX"); | |
5256b006 | 2618 | fd = git_mkstemp_mode(buffer, 0444); |
5723fe7e LT |
2619 | } |
2620 | return fd; | |
2621 | } | |
2622 | ||
bbac7311 | 2623 | static int write_loose_object(const unsigned char *sha1, char *hdr, int hdrlen, |
c00e657d | 2624 | const void *buf, unsigned long len, time_t mtime) |
0fcfd160 | 2625 | { |
915308b1 | 2626 | int fd, ret; |
9892beba | 2627 | unsigned char compressed[4096]; |
ef49a7a0 | 2628 | git_zstream stream; |
748af44c NP |
2629 | git_SHA_CTX c; |
2630 | unsigned char parano_sha1[20]; | |
706bc531 | 2631 | char *filename; |
ab1900a3 | 2632 | static char tmp_file[PATH_MAX]; |
a44c9a5e | 2633 | |
972a9155 | 2634 | filename = sha1_file_name(sha1); |
ab1900a3 | 2635 | fd = create_tmpfile(tmp_file, sizeof(tmp_file), filename); |
aac17941 | 2636 | if (fd < 0) { |
35243577 | 2637 | if (errno == EACCES) |
82247e9b | 2638 | return error("insufficient permission for adding an object to repository database %s", get_object_directory()); |
916d081b | 2639 | else |
5eaeda70 | 2640 | return error("unable to create temporary file: %s", strerror(errno)); |
aac17941 LT |
2641 | } |
2642 | ||
0fcfd160 LT |
2643 | /* Set it up */ |
2644 | memset(&stream, 0, sizeof(stream)); | |
55bb5c91 | 2645 | git_deflate_init(&stream, zlib_compression_level); |
0fcfd160 | 2646 | stream.next_out = compressed; |
9892beba | 2647 | stream.avail_out = sizeof(compressed); |
748af44c | 2648 | git_SHA1_Init(&c); |
a44c9a5e LT |
2649 | |
2650 | /* First header.. */ | |
d65a16f6 | 2651 | stream.next_in = (unsigned char *)hdr; |
a44c9a5e | 2652 | stream.avail_in = hdrlen; |
55bb5c91 JH |
2653 | while (git_deflate(&stream, 0) == Z_OK) |
2654 | ; /* nothing */ | |
748af44c | 2655 | git_SHA1_Update(&c, hdr, hdrlen); |
a44c9a5e LT |
2656 | |
2657 | /* Then the data itself.. */ | |
c00e657d | 2658 | stream.next_in = (void *)buf; |
a44c9a5e | 2659 | stream.avail_in = len; |
9892beba | 2660 | do { |
748af44c | 2661 | unsigned char *in0 = stream.next_in; |
55bb5c91 | 2662 | ret = git_deflate(&stream, Z_FINISH); |
748af44c | 2663 | git_SHA1_Update(&c, in0, stream.next_in - in0); |
9892beba NP |
2664 | if (write_buffer(fd, compressed, stream.next_out - compressed) < 0) |
2665 | die("unable to write sha1 file"); | |
2666 | stream.next_out = compressed; | |
2667 | stream.avail_out = sizeof(compressed); | |
2668 | } while (ret == Z_OK); | |
2669 | ||
ac54c277 LT |
2670 | if (ret != Z_STREAM_END) |
2671 | die("unable to deflate new object %s (%d)", sha1_to_hex(sha1), ret); | |
55bb5c91 | 2672 | ret = git_deflate_end_gently(&stream); |
ac54c277 LT |
2673 | if (ret != Z_OK) |
2674 | die("deflateEnd on object %s failed (%d)", sha1_to_hex(sha1), ret); | |
748af44c NP |
2675 | git_SHA1_Final(parano_sha1, &c); |
2676 | if (hashcmp(sha1, parano_sha1) != 0) | |
2677 | die("confused by unstable object source data for %s", sha1_to_hex(sha1)); | |
ac54c277 | 2678 | |
e9039dd3 | 2679 | close_sha1_file(fd); |
0fcfd160 | 2680 | |
bbac7311 NP |
2681 | if (mtime) { |
2682 | struct utimbuf utb; | |
2683 | utb.actime = mtime; | |
2684 | utb.modtime = mtime; | |
ab1900a3 | 2685 | if (utime(tmp_file, &utb) < 0) |
bbac7311 | 2686 | warning("failed utime() on %s: %s", |
ab1900a3 | 2687 | tmp_file, strerror(errno)); |
bbac7311 NP |
2688 | } |
2689 | ||
ab1900a3 | 2690 | return move_temp_to_file(tmp_file, filename); |
0fcfd160 | 2691 | } |
8237b185 | 2692 | |
c00e657d | 2693 | int write_sha1_file(const void *buf, unsigned long len, const char *type, unsigned char *returnsha1) |
bbac7311 NP |
2694 | { |
2695 | unsigned char sha1[20]; | |
2696 | char hdr[32]; | |
2697 | int hdrlen; | |
2698 | ||
2699 | /* Normally if we have it in the pack then we do not bother writing | |
2700 | * it out into .git/objects/??/?{38} file. | |
2701 | */ | |
2702 | write_sha1_file_prepare(buf, len, type, sha1, hdr, &hdrlen); | |
2703 | if (returnsha1) | |
2704 | hashcpy(returnsha1, sha1); | |
2705 | if (has_sha1_file(sha1)) | |
2706 | return 0; | |
2707 | return write_loose_object(sha1, hdr, hdrlen, buf, len, 0); | |
2708 | } | |
2709 | ||
2710 | int force_object_loose(const unsigned char *sha1, time_t mtime) | |
2711 | { | |
bbac7311 NP |
2712 | void *buf; |
2713 | unsigned long len; | |
2714 | enum object_type type; | |
2715 | char hdr[32]; | |
2716 | int hdrlen; | |
1fb23e65 | 2717 | int ret; |
bbac7311 | 2718 | |
c529d75a | 2719 | if (has_loose_object(sha1)) |
bbac7311 NP |
2720 | return 0; |
2721 | buf = read_packed_sha1(sha1, &type, &len); | |
2722 | if (!buf) | |
2723 | return error("cannot read sha1_file for %s", sha1_to_hex(sha1)); | |
2724 | hdrlen = sprintf(hdr, "%s %lu", typename(type), len) + 1; | |
1fb23e65 BS |
2725 | ret = write_loose_object(sha1, hdr, hdrlen, buf, len, mtime); |
2726 | free(buf); | |
2727 | ||
2728 | return ret; | |
bbac7311 NP |
2729 | } |
2730 | ||
bf592c50 DB |
2731 | int has_pack_index(const unsigned char *sha1) |
2732 | { | |
2733 | struct stat st; | |
2734 | if (stat(sha1_pack_index_name(sha1), &st)) | |
2735 | return 0; | |
2736 | return 1; | |
bf592c50 DB |
2737 | } |
2738 | ||
cd673c1f JH |
2739 | int has_sha1_pack(const unsigned char *sha1) |
2740 | { | |
2741 | struct pack_entry e; | |
2742 | return find_pack_entry(sha1, &e); | |
2743 | } | |
2744 | ||
8237b185 DB |
2745 | int has_sha1_file(const unsigned char *sha1) |
2746 | { | |
1f688557 JH |
2747 | struct pack_entry e; |
2748 | ||
cd673c1f | 2749 | if (find_pack_entry(sha1, &e)) |
1f688557 | 2750 | return 1; |
c529d75a | 2751 | return has_loose_object(sha1); |
8237b185 | 2752 | } |
74400e71 | 2753 | |
c879daa2 NTND |
2754 | static void check_tree(const void *buf, size_t size) |
2755 | { | |
2756 | struct tree_desc desc; | |
2757 | struct name_entry entry; | |
2758 | ||
2759 | init_tree_desc(&desc, buf, size); | |
2760 | while (tree_entry(&desc, &entry)) | |
2761 | /* do nothing | |
2762 | * tree_entry() will die() on malformed entries */ | |
2763 | ; | |
2764 | } | |
2765 | ||
2766 | static void check_commit(const void *buf, size_t size) | |
2767 | { | |
2768 | struct commit c; | |
2769 | memset(&c, 0, sizeof(c)); | |
2770 | if (parse_commit_buffer(&c, buf, size)) | |
2771 | die("corrupt commit"); | |
2772 | } | |
2773 | ||
2774 | static void check_tag(const void *buf, size_t size) | |
2775 | { | |
2776 | struct tag t; | |
2777 | memset(&t, 0, sizeof(t)); | |
2778 | if (parse_tag_buffer(&t, buf, size)) | |
2779 | die("corrupt tag"); | |
2780 | } | |
2781 | ||
43df4f86 | 2782 | static int index_mem(unsigned char *sha1, void *buf, size_t size, |
c4ce46fc JH |
2783 | enum object_type type, |
2784 | const char *path, unsigned flags) | |
e7332f96 | 2785 | { |
6c510bee | 2786 | int ret, re_allocated = 0; |
c4ce46fc | 2787 | int write_object = flags & HASH_WRITE_OBJECT; |
74400e71 | 2788 | |
7672db20 | 2789 | if (!type) |
edaec3fb | 2790 | type = OBJ_BLOB; |
6c510bee LT |
2791 | |
2792 | /* | |
2793 | * Convert blobs to git internal format | |
2794 | */ | |
43df4f86 | 2795 | if ((type == OBJ_BLOB) && path) { |
f285a2d7 | 2796 | struct strbuf nbuf = STRBUF_INIT; |
21e5ad50 | 2797 | if (convert_to_git(path, buf, size, &nbuf, |
5e12e78e | 2798 | write_object ? safe_crlf : SAFE_CRLF_FALSE)) { |
b315c5c0 | 2799 | buf = strbuf_detach(&nbuf, &size); |
6c510bee LT |
2800 | re_allocated = 1; |
2801 | } | |
2802 | } | |
c4ce46fc | 2803 | if (flags & HASH_FORMAT_CHECK) { |
c879daa2 NTND |
2804 | if (type == OBJ_TREE) |
2805 | check_tree(buf, size); | |
2806 | if (type == OBJ_COMMIT) | |
2807 | check_commit(buf, size); | |
2808 | if (type == OBJ_TAG) | |
2809 | check_tag(buf, size); | |
2810 | } | |
6c510bee | 2811 | |
7672db20 | 2812 | if (write_object) |
edaec3fb | 2813 | ret = write_sha1_file(buf, size, typename(type), sha1); |
abdc3fc8 | 2814 | else |
edaec3fb | 2815 | ret = hash_sha1_file(buf, size, typename(type), sha1); |
43df4f86 | 2816 | if (re_allocated) |
6c510bee | 2817 | free(buf); |
43df4f86 DP |
2818 | return ret; |
2819 | } | |
2820 | ||
7b41e1e1 JH |
2821 | static int index_pipe(unsigned char *sha1, int fd, enum object_type type, |
2822 | const char *path, unsigned flags) | |
2823 | { | |
2824 | struct strbuf sbuf = STRBUF_INIT; | |
2825 | int ret; | |
2826 | ||
2827 | if (strbuf_read(&sbuf, fd, 4096) >= 0) | |
2828 | ret = index_mem(sha1, sbuf.buf, sbuf.len, type, path, flags); | |
2829 | else | |
2830 | ret = -1; | |
2831 | strbuf_release(&sbuf); | |
2832 | return ret; | |
2833 | } | |
2834 | ||
ea68b0ce DP |
2835 | #define SMALL_FILE_SIZE (32*1024) |
2836 | ||
7b41e1e1 JH |
2837 | static int index_core(unsigned char *sha1, int fd, size_t size, |
2838 | enum object_type type, const char *path, | |
2839 | unsigned flags) | |
43df4f86 DP |
2840 | { |
2841 | int ret; | |
43df4f86 | 2842 | |
7b41e1e1 | 2843 | if (!size) { |
c4ce46fc | 2844 | ret = index_mem(sha1, NULL, size, type, path, flags); |
ea68b0ce DP |
2845 | } else if (size <= SMALL_FILE_SIZE) { |
2846 | char *buf = xmalloc(size); | |
2847 | if (size == read_in_full(fd, buf, size)) | |
c4ce46fc | 2848 | ret = index_mem(sha1, buf, size, type, path, flags); |
ea68b0ce DP |
2849 | else |
2850 | ret = error("short read %s", strerror(errno)); | |
2851 | free(buf); | |
08bda208 | 2852 | } else { |
43df4f86 | 2853 | void *buf = xmmap(NULL, size, PROT_READ, MAP_PRIVATE, fd, 0); |
c4ce46fc | 2854 | ret = index_mem(sha1, buf, size, type, path, flags); |
aac17941 | 2855 | munmap(buf, size); |
08bda208 | 2856 | } |
7b41e1e1 JH |
2857 | return ret; |
2858 | } | |
2859 | ||
4dd1fbc7 | 2860 | /* |
568508e7 JH |
2861 | * This creates one packfile per large blob unless bulk-checkin |
2862 | * machinery is "plugged". | |
4dd1fbc7 JH |
2863 | * |
2864 | * This also bypasses the usual "convert-to-git" dance, and that is on | |
2865 | * purpose. We could write a streaming version of the converting | |
2866 | * functions and insert that before feeding the data to fast-import | |
4f22b101 JK |
2867 | * (or equivalent in-core API described above). However, that is |
2868 | * somewhat complicated, as we do not know the size of the filter | |
2869 | * result, which we need to know beforehand when writing a git object. | |
2870 | * Since the primary motivation for trying to stream from the working | |
2871 | * tree file and to avoid mmaping it in core is to deal with large | |
2872 | * binary blobs, they generally do not want to get any conversion, and | |
2873 | * callers should avoid this code path when filters are requested. | |
4dd1fbc7 JH |
2874 | */ |
2875 | static int index_stream(unsigned char *sha1, int fd, size_t size, | |
2876 | enum object_type type, const char *path, | |
2877 | unsigned flags) | |
2878 | { | |
568508e7 | 2879 | return index_bulk_checkin(sha1, fd, size, type, path, flags); |
4dd1fbc7 JH |
2880 | } |
2881 | ||
7b41e1e1 JH |
2882 | int index_fd(unsigned char *sha1, int fd, struct stat *st, |
2883 | enum object_type type, const char *path, unsigned flags) | |
2884 | { | |
2885 | int ret; | |
2886 | size_t size = xsize_t(st->st_size); | |
2887 | ||
2888 | if (!S_ISREG(st->st_mode)) | |
2889 | ret = index_pipe(sha1, fd, type, path, flags); | |
4f22b101 JK |
2890 | else if (size <= big_file_threshold || type != OBJ_BLOB || |
2891 | (path && would_convert_to_git(path, NULL, 0, 0))) | |
7b41e1e1 | 2892 | ret = index_core(sha1, fd, size, type, path, flags); |
4dd1fbc7 JH |
2893 | else |
2894 | ret = index_stream(sha1, fd, size, type, path, flags); | |
43df4f86 | 2895 | close(fd); |
aac17941 | 2896 | return ret; |
74400e71 | 2897 | } |
ec1fcc16 | 2898 | |
c4ce46fc | 2899 | int index_path(unsigned char *sha1, const char *path, struct stat *st, unsigned flags) |
ec1fcc16 JH |
2900 | { |
2901 | int fd; | |
b760d3aa | 2902 | struct strbuf sb = STRBUF_INIT; |
ec1fcc16 JH |
2903 | |
2904 | switch (st->st_mode & S_IFMT) { | |
2905 | case S_IFREG: | |
2906 | fd = open(path, O_RDONLY); | |
2907 | if (fd < 0) | |
2908 | return error("open(\"%s\"): %s", path, | |
2909 | strerror(errno)); | |
c4ce46fc | 2910 | if (index_fd(sha1, fd, st, OBJ_BLOB, path, flags) < 0) |
ec1fcc16 JH |
2911 | return error("%s: failed to insert into database", |
2912 | path); | |
2913 | break; | |
2914 | case S_IFLNK: | |
b760d3aa | 2915 | if (strbuf_readlink(&sb, path, st->st_size)) { |
ec1fcc16 | 2916 | char *errstr = strerror(errno); |
ec1fcc16 JH |
2917 | return error("readlink(\"%s\"): %s", path, |
2918 | errstr); | |
2919 | } | |
c4ce46fc | 2920 | if (!(flags & HASH_WRITE_OBJECT)) |
b760d3aa LT |
2921 | hash_sha1_file(sb.buf, sb.len, blob_type, sha1); |
2922 | else if (write_sha1_file(sb.buf, sb.len, blob_type, sha1)) | |
ec1fcc16 JH |
2923 | return error("%s: failed to insert into database", |
2924 | path); | |
b760d3aa | 2925 | strbuf_release(&sb); |
ec1fcc16 | 2926 | break; |
f35a6d3b LT |
2927 | case S_IFDIR: |
2928 | return resolve_gitlink_ref(path, "HEAD", sha1); | |
ec1fcc16 JH |
2929 | default: |
2930 | return error("%s: unsupported file type", path); | |
2931 | } | |
2932 | return 0; | |
2933 | } | |
a69e5429 JH |
2934 | |
2935 | int read_pack_header(int fd, struct pack_header *header) | |
2936 | { | |
c697ad14 HO |
2937 | if (read_in_full(fd, header, sizeof(*header)) < sizeof(*header)) |
2938 | /* "eof before pack header was fully read" */ | |
2939 | return PH_ERROR_EOF; | |
2940 | ||
a69e5429 JH |
2941 | if (header->hdr_signature != htonl(PACK_SIGNATURE)) |
2942 | /* "protocol error (pack signature mismatch detected)" */ | |
2943 | return PH_ERROR_PACK_SIGNATURE; | |
2944 | if (!pack_version_ok(header->hdr_version)) | |
2945 | /* "protocol error (pack version unsupported)" */ | |
2946 | return PH_ERROR_PROTOCOL; | |
2947 | return 0; | |
2948 | } | |
40d52ff7 JK |
2949 | |
2950 | void assert_sha1_type(const unsigned char *sha1, enum object_type expect) | |
2951 | { | |
2952 | enum object_type type = sha1_object_info(sha1, NULL); | |
2953 | if (type < 0) | |
2954 | die("%s is not a valid object", sha1_to_hex(sha1)); | |
2955 | if (type != expect) | |
2956 | die("%s is not a valid '%s' object", sha1_to_hex(sha1), | |
2957 | typename(expect)); | |
2958 | } |