]>
Commit | Line | Data |
---|---|---|
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" |
b2141fc1 | 10 | #include "config.h" |
6eac50d8 | 11 | #include "string-list.h" |
697cc8ef | 12 | #include "lockfile.h" |
1f688557 | 13 | #include "delta.h" |
a733cb60 | 14 | #include "pack.h" |
8e440259 PE |
15 | #include "blob.h" |
16 | #include "commit.h" | |
4dd1fbc7 | 17 | #include "run-command.h" |
8e440259 PE |
18 | #include "tag.h" |
19 | #include "tree.h" | |
c879daa2 | 20 | #include "tree-walk.h" |
f35a6d3b | 21 | #include "refs.h" |
70f5d5d3 | 22 | #include "pack-revindex.h" |
628522ec | 23 | #include "sha1-lookup.h" |
568508e7 | 24 | #include "bulk-checkin.h" |
090ea126 | 25 | #include "streaming.h" |
543c5caa | 26 | #include "dir.h" |
a73cdd21 | 27 | #include "mru.h" |
12d95ef6 | 28 | #include "list.h" |
c4c6effa | 29 | #include "mergesort.h" |
cf3c6352 | 30 | #include "quote.h" |
4f39cd82 | 31 | #include "packfile.h" |
e05db0fd | 32 | |
50c5cd58 | 33 | const unsigned char null_sha1[GIT_MAX_RAWSZ]; |
3e56e724 | 34 | const struct object_id null_oid; |
8576fde6 JK |
35 | const struct object_id empty_tree_oid = { |
36 | EMPTY_TREE_SHA1_BIN_LITERAL | |
37 | }; | |
38 | const struct object_id empty_blob_oid = { | |
39 | EMPTY_BLOB_SHA1_BIN_LITERAL | |
40 | }; | |
88cd621d | 41 | |
ac73cedf | 42 | static void git_hash_sha1_init(git_hash_ctx *ctx) |
f50e766b | 43 | { |
ac73cedf | 44 | git_SHA1_Init(&ctx->sha1); |
f50e766b | 45 | } |
46 | ||
ac73cedf | 47 | static void git_hash_sha1_update(git_hash_ctx *ctx, const void *data, size_t len) |
f50e766b | 48 | { |
ac73cedf | 49 | git_SHA1_Update(&ctx->sha1, data, len); |
f50e766b | 50 | } |
51 | ||
ac73cedf | 52 | static void git_hash_sha1_final(unsigned char *hash, git_hash_ctx *ctx) |
f50e766b | 53 | { |
ac73cedf | 54 | git_SHA1_Final(hash, &ctx->sha1); |
f50e766b | 55 | } |
56 | ||
ac73cedf | 57 | static void git_hash_unknown_init(git_hash_ctx *ctx) |
f50e766b | 58 | { |
59 | die("trying to init unknown hash"); | |
60 | } | |
61 | ||
ac73cedf | 62 | static void git_hash_unknown_update(git_hash_ctx *ctx, const void *data, size_t len) |
f50e766b | 63 | { |
64 | die("trying to update unknown hash"); | |
65 | } | |
66 | ||
ac73cedf | 67 | static void git_hash_unknown_final(unsigned char *hash, git_hash_ctx *ctx) |
f50e766b | 68 | { |
69 | die("trying to finalize unknown hash"); | |
70 | } | |
71 | ||
72 | const struct git_hash_algo hash_algos[GIT_HASH_NALGOS] = { | |
73 | { | |
74 | NULL, | |
75 | 0x00000000, | |
76 | 0, | |
77 | 0, | |
f50e766b | 78 | git_hash_unknown_init, |
79 | git_hash_unknown_update, | |
80 | git_hash_unknown_final, | |
81 | NULL, | |
82 | NULL, | |
83 | }, | |
84 | { | |
85 | "sha-1", | |
86 | /* "sha1", big-endian */ | |
87 | 0x73686131, | |
f50e766b | 88 | GIT_SHA1_RAWSZ, |
89 | GIT_SHA1_HEXSZ, | |
90 | git_hash_sha1_init, | |
91 | git_hash_sha1_update, | |
92 | git_hash_sha1_final, | |
93 | &empty_tree_oid, | |
94 | &empty_blob_oid, | |
95 | }, | |
96 | }; | |
97 | ||
c597ba80 NTND |
98 | /* |
99 | * This is meant to hold a *small* number of objects that you would | |
100 | * want read_sha1_file() to be able to return, but yet you do not want | |
101 | * to write them into the object store (e.g. a browse-only | |
102 | * application). | |
103 | */ | |
104 | static struct cached_object { | |
105 | unsigned char sha1[20]; | |
106 | enum object_type type; | |
107 | void *buf; | |
108 | unsigned long size; | |
109 | } *cached_objects; | |
110 | static int cached_object_nr, cached_object_alloc; | |
111 | ||
112 | static struct cached_object empty_tree = { | |
dab0d410 | 113 | EMPTY_TREE_SHA1_BIN_LITERAL, |
c597ba80 NTND |
114 | OBJ_TREE, |
115 | "", | |
116 | 0 | |
117 | }; | |
118 | ||
119 | static struct cached_object *find_cached_object(const unsigned char *sha1) | |
120 | { | |
121 | int i; | |
122 | struct cached_object *co = cached_objects; | |
123 | ||
124 | for (i = 0; i < cached_object_nr; i++, co++) { | |
125 | if (!hashcmp(co->sha1, sha1)) | |
126 | return co; | |
127 | } | |
128 | if (!hashcmp(sha1, empty_tree.sha1)) | |
129 | return &empty_tree; | |
130 | return NULL; | |
131 | } | |
132 | ||
9472935d TB |
133 | |
134 | static enum safe_crlf get_safe_crlf(unsigned flags) | |
135 | { | |
136 | if (flags & HASH_RENORMALIZE) | |
137 | return SAFE_CRLF_RENORMALIZE; | |
138 | else if (flags & HASH_WRITE_OBJECT) | |
139 | return safe_crlf; | |
140 | else | |
141 | return SAFE_CRLF_FALSE; | |
142 | } | |
143 | ||
144 | ||
90a6464b JH |
145 | int mkdir_in_gitdir(const char *path) |
146 | { | |
147 | if (mkdir(path, 0777)) { | |
148 | int saved_errno = errno; | |
149 | struct stat st; | |
150 | struct strbuf sb = STRBUF_INIT; | |
151 | ||
152 | if (errno != EEXIST) | |
153 | return -1; | |
154 | /* | |
155 | * Are we looking at a path in a symlinked worktree | |
156 | * whose original repository does not yet have it? | |
157 | * e.g. .git/rr-cache pointing at its original | |
158 | * repository in which the user hasn't performed any | |
159 | * conflict resolution yet? | |
160 | */ | |
161 | if (lstat(path, &st) || !S_ISLNK(st.st_mode) || | |
162 | strbuf_readlink(&sb, path, st.st_size) || | |
163 | !is_absolute_path(sb.buf) || | |
164 | mkdir(sb.buf, 0777)) { | |
165 | strbuf_release(&sb); | |
166 | errno = saved_errno; | |
167 | return -1; | |
168 | } | |
169 | strbuf_release(&sb); | |
170 | } | |
171 | return adjust_shared_perm(path); | |
172 | } | |
173 | ||
0be0521b | 174 | enum scld_error safe_create_leading_directories(char *path) |
b2cb9425 | 175 | { |
26c8ae2a | 176 | char *next_component = path + offset_1st_component(path); |
0be0521b | 177 | enum scld_error ret = SCLD_OK; |
67d42212 | 178 | |
0be0521b | 179 | while (ret == SCLD_OK && next_component) { |
f0502332 | 180 | struct stat st; |
0f527403 | 181 | char *slash = next_component, slash_character; |
f0502332 | 182 | |
0f527403 MH |
183 | while (*slash && !is_dir_sep(*slash)) |
184 | slash++; | |
185 | ||
186 | if (!*slash) | |
b2cb9425 | 187 | break; |
bf10cf70 | 188 | |
26c8ae2a | 189 | next_component = slash + 1; |
0f527403 | 190 | while (is_dir_sep(*next_component)) |
bf10cf70 | 191 | next_component++; |
26c8ae2a | 192 | if (!*next_component) |
5f0bdf50 | 193 | break; |
831651fd | 194 | |
0f527403 | 195 | slash_character = *slash; |
831651fd | 196 | *slash = '\0'; |
67d42212 JR |
197 | if (!stat(path, &st)) { |
198 | /* path exists */ | |
204a047f MH |
199 | if (!S_ISDIR(st.st_mode)) { |
200 | errno = ENOTDIR; | |
0be0521b | 201 | ret = SCLD_EXISTS; |
204a047f | 202 | } |
53a39721 | 203 | } else if (mkdir(path, 0777)) { |
928734d9 | 204 | if (errno == EEXIST && |
9e6f885d | 205 | !stat(path, &st) && S_ISDIR(st.st_mode)) |
928734d9 | 206 | ; /* somebody created it since we checked */ |
18d37e86 MH |
207 | else if (errno == ENOENT) |
208 | /* | |
209 | * Either mkdir() failed because | |
210 | * somebody just pruned the containing | |
211 | * directory, or stat() failed because | |
212 | * the file that was in our way was | |
213 | * just removed. Either way, inform | |
214 | * the caller that it might be worth | |
215 | * trying again: | |
216 | */ | |
217 | ret = SCLD_VANISHED; | |
9e6f885d | 218 | else |
0be0521b | 219 | ret = SCLD_FAILED; |
53a39721 | 220 | } else if (adjust_shared_perm(path)) { |
0be0521b | 221 | ret = SCLD_PERMS; |
457f06d6 | 222 | } |
0f527403 | 223 | *slash = slash_character; |
b2cb9425 | 224 | } |
9e6f885d | 225 | return ret; |
b2cb9425 | 226 | } |
723c31fe | 227 | |
0be0521b | 228 | enum scld_error safe_create_leading_directories_const(const char *path) |
8e21d63b | 229 | { |
02944307 | 230 | int save_errno; |
8e21d63b JK |
231 | /* path points to cache entries, so xstrdup before messing with it */ |
232 | char *buf = xstrdup(path); | |
0be0521b | 233 | enum scld_error result = safe_create_leading_directories(buf); |
02944307 MH |
234 | |
235 | save_errno = errno; | |
8e21d63b | 236 | free(buf); |
02944307 | 237 | errno = save_errno; |
8e21d63b JK |
238 | return result; |
239 | } | |
240 | ||
177978f5 MH |
241 | int raceproof_create_file(const char *path, create_file_fn fn, void *cb) |
242 | { | |
243 | /* | |
244 | * The number of times we will try to remove empty directories | |
245 | * in the way of path. This is only 1 because if another | |
246 | * process is racily creating directories that conflict with | |
247 | * us, we don't want to fight against them. | |
248 | */ | |
249 | int remove_directories_remaining = 1; | |
250 | ||
251 | /* | |
252 | * The number of times that we will try to create the | |
253 | * directories containing path. We are willing to attempt this | |
254 | * more than once, because another process could be trying to | |
255 | * clean up empty directories at the same time as we are | |
256 | * trying to create them. | |
257 | */ | |
258 | int create_directories_remaining = 3; | |
259 | ||
260 | /* A scratch copy of path, filled lazily if we need it: */ | |
261 | struct strbuf path_copy = STRBUF_INIT; | |
262 | ||
263 | int ret, save_errno; | |
264 | ||
265 | /* Sanity check: */ | |
266 | assert(*path); | |
267 | ||
268 | retry_fn: | |
269 | ret = fn(path, cb); | |
270 | save_errno = errno; | |
271 | if (!ret) | |
272 | goto out; | |
273 | ||
274 | if (errno == EISDIR && remove_directories_remaining-- > 0) { | |
275 | /* | |
276 | * A directory is in the way. Maybe it is empty; try | |
277 | * to remove it: | |
278 | */ | |
279 | if (!path_copy.len) | |
280 | strbuf_addstr(&path_copy, path); | |
281 | ||
282 | if (!remove_dir_recursively(&path_copy, REMOVE_DIR_EMPTY_ONLY)) | |
283 | goto retry_fn; | |
284 | } else if (errno == ENOENT && create_directories_remaining-- > 0) { | |
285 | /* | |
286 | * Maybe the containing directory didn't exist, or | |
287 | * maybe it was just deleted by a process that is | |
288 | * racing with us to clean up empty directories. Try | |
289 | * to create it: | |
290 | */ | |
291 | enum scld_error scld_result; | |
292 | ||
293 | if (!path_copy.len) | |
294 | strbuf_addstr(&path_copy, path); | |
295 | ||
296 | do { | |
297 | scld_result = safe_create_leading_directories(path_copy.buf); | |
298 | if (scld_result == SCLD_OK) | |
299 | goto retry_fn; | |
300 | } while (scld_result == SCLD_VANISHED && create_directories_remaining-- > 0); | |
301 | } | |
302 | ||
303 | out: | |
304 | strbuf_release(&path_copy); | |
305 | errno = save_errno; | |
306 | return ret; | |
307 | } | |
308 | ||
f7b7774f | 309 | static void fill_sha1_path(struct strbuf *buf, const unsigned char *sha1) |
ace1534d JH |
310 | { |
311 | int i; | |
312 | for (i = 0; i < 20; i++) { | |
313 | static char hex[] = "0123456789abcdef"; | |
314 | unsigned int val = sha1[i]; | |
f7b7774f JK |
315 | strbuf_addch(buf, hex[val >> 4]); |
316 | strbuf_addch(buf, hex[val & 0xf]); | |
afbba2f0 | 317 | if (!i) |
f7b7774f | 318 | strbuf_addch(buf, '/'); |
ace1534d JH |
319 | } |
320 | } | |
321 | ||
30d6c6ea | 322 | const char *sha1_file_name(const unsigned char *sha1) |
0fcfd160 | 323 | { |
f7b7774f | 324 | static struct strbuf buf = STRBUF_INIT; |
0fcfd160 | 325 | |
f7b7774f JK |
326 | strbuf_reset(&buf); |
327 | strbuf_addf(&buf, "%s/", get_object_directory()); | |
560fb6a1 | 328 | |
f7b7774f JK |
329 | fill_sha1_path(&buf, sha1); |
330 | return buf.buf; | |
0fcfd160 LT |
331 | } |
332 | ||
38dbe5f0 JK |
333 | struct strbuf *alt_scratch_buf(struct alternate_object_database *alt) |
334 | { | |
335 | strbuf_setlen(&alt->scratch, alt->base_len); | |
336 | return &alt->scratch; | |
337 | } | |
338 | ||
29ec6af2 JK |
339 | static const char *alt_sha1_path(struct alternate_object_database *alt, |
340 | const unsigned char *sha1) | |
341 | { | |
38dbe5f0 | 342 | struct strbuf *buf = alt_scratch_buf(alt); |
f7b7774f | 343 | fill_sha1_path(buf, sha1); |
38dbe5f0 | 344 | return buf->buf; |
0fcfd160 LT |
345 | } |
346 | ||
d5a63b99 JH |
347 | struct alternate_object_database *alt_odb_list; |
348 | static struct alternate_object_database **alt_odb_tail; | |
ace1534d | 349 | |
4ea82473 JK |
350 | /* |
351 | * Return non-zero iff the path is usable as an alternate object database. | |
352 | */ | |
353 | static int alt_odb_usable(struct strbuf *path, const char *normalized_objdir) | |
354 | { | |
355 | struct alternate_object_database *alt; | |
356 | ||
357 | /* Detect cases where alternate disappeared */ | |
358 | if (!is_directory(path->buf)) { | |
359 | error("object directory %s does not exist; " | |
360 | "check .git/objects/info/alternates.", | |
361 | path->buf); | |
362 | return 0; | |
363 | } | |
364 | ||
365 | /* | |
366 | * Prevent the common mistake of listing the same | |
367 | * thing twice, or object directory itself. | |
368 | */ | |
369 | for (alt = alt_odb_list; alt; alt = alt->next) { | |
ea0fc3b4 | 370 | if (!fspathcmp(path->buf, alt->path)) |
4ea82473 JK |
371 | return 0; |
372 | } | |
373 | if (!fspathcmp(path->buf, normalized_objdir)) | |
374 | return 0; | |
375 | ||
376 | return 1; | |
377 | } | |
378 | ||
ddd5d056 JH |
379 | /* |
380 | * Prepare alternate object database registry. | |
d5a63b99 JH |
381 | * |
382 | * The variable alt_odb_list points at the list of struct | |
383 | * alternate_object_database. The elements on this list come from | |
384 | * non-empty elements from colon separated ALTERNATE_DB_ENVIRONMENT | |
385 | * environment variable, and $GIT_OBJECT_DIRECTORY/info/alternates, | |
1494e038 JH |
386 | * whose contents is similar to that environment variable but can be |
387 | * LF separated. Its base points at a statically allocated buffer that | |
d5a63b99 JH |
388 | * contains "/the/directory/corresponding/to/.git/objects/...", while |
389 | * its name points just after the slash at the end of ".git/objects/" | |
390 | * in the example above, and has enough space to hold 40-byte hex | |
391 | * SHA1, an extra slash for the first level indirection, and the | |
392 | * terminating NUL. | |
ddd5d056 | 393 | */ |
2456990d | 394 | static void read_info_alternates(const char * relative_base, int depth); |
539e7506 EK |
395 | static int link_alt_odb_entry(const char *entry, const char *relative_base, |
396 | int depth, const char *normalized_objdir) | |
ace1534d | 397 | { |
c2f493a4 | 398 | struct alternate_object_database *ent; |
5bdf0a84 | 399 | struct strbuf pathbuf = STRBUF_INIT; |
d5a63b99 | 400 | |
85dadc38 | 401 | if (!is_absolute_path(entry) && relative_base) { |
4ac9006f | 402 | strbuf_realpath(&pathbuf, relative_base, 1); |
5bdf0a84 | 403 | strbuf_addch(&pathbuf, '/'); |
c2f493a4 | 404 | } |
6eac50d8 | 405 | strbuf_addstr(&pathbuf, entry); |
c2f493a4 | 406 | |
37a95862 | 407 | if (strbuf_normalize_path(&pathbuf) < 0 && relative_base) { |
670c359d JK |
408 | error("unable to normalize alternate object path: %s", |
409 | pathbuf.buf); | |
410 | strbuf_release(&pathbuf); | |
411 | return -1; | |
412 | } | |
5bdf0a84 HW |
413 | |
414 | /* | |
415 | * The trailing slash after the directory name is given by | |
416 | * this function at the end. Remove duplicates. | |
417 | */ | |
4ea82473 JK |
418 | while (pathbuf.len && pathbuf.buf[pathbuf.len - 1] == '/') |
419 | strbuf_setlen(&pathbuf, pathbuf.len - 1); | |
5bdf0a84 | 420 | |
4ea82473 JK |
421 | if (!alt_odb_usable(&pathbuf, normalized_objdir)) { |
422 | strbuf_release(&pathbuf); | |
c2f493a4 MW |
423 | return -1; |
424 | } | |
425 | ||
7f0fa2c0 | 426 | ent = alloc_alt_odb(pathbuf.buf); |
c2f493a4 MW |
427 | |
428 | /* add the alternate entry */ | |
429 | *alt_odb_tail = ent; | |
430 | alt_odb_tail = &(ent->next); | |
431 | ent->next = NULL; | |
432 | ||
433 | /* recursively add alternates */ | |
4ea82473 | 434 | read_info_alternates(pathbuf.buf, depth + 1); |
c2f493a4 | 435 | |
4ea82473 | 436 | strbuf_release(&pathbuf); |
c2f493a4 MW |
437 | return 0; |
438 | } | |
439 | ||
cf3c6352 JK |
440 | static const char *parse_alt_odb_entry(const char *string, |
441 | int sep, | |
442 | struct strbuf *out) | |
443 | { | |
444 | const char *end; | |
445 | ||
446 | strbuf_reset(out); | |
447 | ||
448 | if (*string == '#') { | |
449 | /* comment; consume up to next separator */ | |
450 | end = strchrnul(string, sep); | |
451 | } else if (*string == '"' && !unquote_c_style(out, string, &end)) { | |
452 | /* | |
453 | * quoted path; unquote_c_style has copied the | |
454 | * data for us and set "end". Broken quoting (e.g., | |
455 | * an entry that doesn't end with a quote) falls | |
456 | * back to the unquoted case below. | |
457 | */ | |
458 | } else { | |
459 | /* normal, unquoted path */ | |
460 | end = strchrnul(string, sep); | |
461 | strbuf_add(out, string, end - string); | |
462 | } | |
463 | ||
464 | if (*end) | |
465 | end++; | |
466 | return end; | |
467 | } | |
468 | ||
dc732bd5 | 469 | static void link_alt_odb_entries(const char *alt, int sep, |
c2f493a4 MW |
470 | const char *relative_base, int depth) |
471 | { | |
539e7506 | 472 | struct strbuf objdirbuf = STRBUF_INIT; |
cf3c6352 | 473 | struct strbuf entry = STRBUF_INIT; |
c2f493a4 | 474 | |
f28e3668 JK |
475 | if (!alt || !*alt) |
476 | return; | |
477 | ||
c2f493a4 MW |
478 | if (depth > 5) { |
479 | error("%s: ignoring alternate object stores, nesting too deep.", | |
480 | relative_base); | |
481 | return; | |
482 | } | |
483 | ||
f655651e | 484 | strbuf_add_absolute_path(&objdirbuf, get_object_directory()); |
670c359d JK |
485 | if (strbuf_normalize_path(&objdirbuf) < 0) |
486 | die("unable to normalize object directory: %s", | |
487 | objdirbuf.buf); | |
539e7506 | 488 | |
cf3c6352 JK |
489 | while (*alt) { |
490 | alt = parse_alt_odb_entry(alt, sep, &entry); | |
491 | if (!entry.len) | |
9577e7e3 | 492 | continue; |
cf3c6352 | 493 | link_alt_odb_entry(entry.buf, relative_base, depth, objdirbuf.buf); |
9577e7e3 | 494 | } |
cf3c6352 | 495 | strbuf_release(&entry); |
539e7506 | 496 | strbuf_release(&objdirbuf); |
d5a63b99 JH |
497 | } |
498 | ||
2456990d | 499 | static void read_info_alternates(const char * relative_base, int depth) |
d5a63b99 | 500 | { |
5015f01c | 501 | char *path; |
dc732bd5 | 502 | struct strbuf buf = STRBUF_INIT; |
d5a63b99 | 503 | |
5015f01c | 504 | path = xstrfmt("%s/info/alternates", relative_base); |
dc732bd5 | 505 | if (strbuf_read_file(&buf, path, 1024) < 0) { |
f0f7bebe | 506 | warn_on_fopen_errors(path); |
dc732bd5 | 507 | free(path); |
9a217f2a | 508 | return; |
ace1534d | 509 | } |
d5a63b99 | 510 | |
dc732bd5 JK |
511 | link_alt_odb_entries(buf.buf, '\n', relative_base, depth); |
512 | strbuf_release(&buf); | |
513 | free(path); | |
ace1534d JH |
514 | } |
515 | ||
7f0fa2c0 JK |
516 | struct alternate_object_database *alloc_alt_odb(const char *dir) |
517 | { | |
518 | struct alternate_object_database *ent; | |
7f0fa2c0 | 519 | |
597f9134 | 520 | FLEX_ALLOC_STR(ent, path, dir); |
38dbe5f0 JK |
521 | strbuf_init(&ent->scratch, 0); |
522 | strbuf_addf(&ent->scratch, "%s/", dir); | |
523 | ent->base_len = ent->scratch.len; | |
7f0fa2c0 JK |
524 | |
525 | return ent; | |
526 | } | |
527 | ||
bef70b22 DB |
528 | void add_to_alternates_file(const char *reference) |
529 | { | |
f132a127 | 530 | struct lock_file lock = LOCK_INIT; |
77b9b1d1 JK |
531 | char *alts = git_pathdup("objects/info/alternates"); |
532 | FILE *in, *out; | |
f132a127 | 533 | int found = 0; |
77b9b1d1 | 534 | |
f132a127 MÅ |
535 | hold_lock_file_for_update(&lock, alts, LOCK_DIE_ON_ERROR); |
536 | out = fdopen_lock_file(&lock, "w"); | |
77b9b1d1 JK |
537 | if (!out) |
538 | die_errno("unable to fdopen alternates lockfile"); | |
539 | ||
540 | in = fopen(alts, "r"); | |
541 | if (in) { | |
542 | struct strbuf line = STRBUF_INIT; | |
77b9b1d1 | 543 | |
3f163962 | 544 | while (strbuf_getline(&line, in) != EOF) { |
77b9b1d1 JK |
545 | if (!strcmp(reference, line.buf)) { |
546 | found = 1; | |
547 | break; | |
548 | } | |
549 | fprintf_or_die(out, "%s\n", line.buf); | |
550 | } | |
551 | ||
552 | strbuf_release(&line); | |
553 | fclose(in); | |
77b9b1d1 JK |
554 | } |
555 | else if (errno != ENOENT) | |
556 | die_errno("unable to read alternates file"); | |
557 | ||
f132a127 MÅ |
558 | if (found) { |
559 | rollback_lock_file(&lock); | |
560 | } else { | |
77b9b1d1 | 561 | fprintf_or_die(out, "%s\n", reference); |
f132a127 | 562 | if (commit_lock_file(&lock)) |
77b9b1d1 JK |
563 | die_errno("unable to move new alternates file into place"); |
564 | if (alt_odb_tail) | |
dc732bd5 | 565 | link_alt_odb_entries(reference, '\n', NULL, 0); |
77b9b1d1 JK |
566 | } |
567 | free(alts); | |
bef70b22 DB |
568 | } |
569 | ||
a5b34d21 JK |
570 | void add_to_alternates_memory(const char *reference) |
571 | { | |
572 | /* | |
573 | * Make sure alternates are initialized, or else our entry may be | |
574 | * overwritten when they are. | |
575 | */ | |
576 | prepare_alt_odb(); | |
577 | ||
dc732bd5 | 578 | link_alt_odb_entries(reference, '\n', NULL, 0); |
a5b34d21 JK |
579 | } |
580 | ||
9eeea7d2 SB |
581 | /* |
582 | * Compute the exact path an alternate is at and returns it. In case of | |
583 | * error NULL is returned and the human readable error is added to `err` | |
584 | * `path` may be relative and should point to $GITDIR. | |
585 | * `err` must not be null. | |
586 | */ | |
587 | char *compute_alternate_path(const char *path, struct strbuf *err) | |
588 | { | |
589 | char *ref_git = NULL; | |
590 | const char *repo, *ref_git_s; | |
591 | int seen_error = 0; | |
592 | ||
593 | ref_git_s = real_path_if_valid(path); | |
594 | if (!ref_git_s) { | |
595 | seen_error = 1; | |
596 | strbuf_addf(err, _("path '%s' does not exist"), path); | |
597 | goto out; | |
598 | } else | |
599 | /* | |
600 | * Beware: read_gitfile(), real_path() and mkpath() | |
601 | * return static buffer | |
602 | */ | |
603 | ref_git = xstrdup(ref_git_s); | |
604 | ||
605 | repo = read_gitfile(ref_git); | |
606 | if (!repo) | |
607 | repo = read_gitfile(mkpath("%s/.git", ref_git)); | |
608 | if (repo) { | |
609 | free(ref_git); | |
610 | ref_git = xstrdup(repo); | |
611 | } | |
612 | ||
613 | if (!repo && is_directory(mkpath("%s/.git/objects", ref_git))) { | |
614 | char *ref_git_git = mkpathdup("%s/.git", ref_git); | |
615 | free(ref_git); | |
616 | ref_git = ref_git_git; | |
617 | } else if (!is_directory(mkpath("%s/objects", ref_git))) { | |
618 | struct strbuf sb = STRBUF_INIT; | |
619 | seen_error = 1; | |
620 | if (get_common_dir(&sb, ref_git)) { | |
621 | strbuf_addf(err, | |
622 | _("reference repository '%s' as a linked " | |
623 | "checkout is not supported yet."), | |
624 | path); | |
625 | goto out; | |
626 | } | |
627 | ||
628 | strbuf_addf(err, _("reference repository '%s' is not a " | |
629 | "local repository."), path); | |
630 | goto out; | |
631 | } | |
632 | ||
633 | if (!access(mkpath("%s/shallow", ref_git), F_OK)) { | |
634 | strbuf_addf(err, _("reference repository '%s' is shallow"), | |
635 | path); | |
636 | seen_error = 1; | |
637 | goto out; | |
638 | } | |
639 | ||
640 | if (!access(mkpath("%s/info/grafts", ref_git), F_OK)) { | |
641 | strbuf_addf(err, | |
642 | _("reference repository '%s' is grafted"), | |
643 | path); | |
644 | seen_error = 1; | |
645 | goto out; | |
646 | } | |
647 | ||
648 | out: | |
649 | if (seen_error) { | |
6a83d902 | 650 | FREE_AND_NULL(ref_git); |
9eeea7d2 SB |
651 | } |
652 | ||
653 | return ref_git; | |
654 | } | |
655 | ||
fe1b2268 | 656 | int foreach_alt_odb(alt_odb_fn fn, void *cb) |
d79796bc JH |
657 | { |
658 | struct alternate_object_database *ent; | |
fe1b2268 | 659 | int r = 0; |
d79796bc JH |
660 | |
661 | prepare_alt_odb(); | |
fe1b2268 JK |
662 | for (ent = alt_odb_list; ent; ent = ent->next) { |
663 | r = fn(ent, cb); | |
664 | if (r) | |
665 | break; | |
666 | } | |
667 | return r; | |
d79796bc JH |
668 | } |
669 | ||
c2f493a4 MW |
670 | void prepare_alt_odb(void) |
671 | { | |
554fe20d | 672 | const char *alt; |
c2f493a4 | 673 | |
7dc24aa5 SP |
674 | if (alt_odb_tail) |
675 | return; | |
676 | ||
c2f493a4 | 677 | alt = getenv(ALTERNATE_DB_ENVIRONMENT); |
c2f493a4 | 678 | |
c2f493a4 | 679 | alt_odb_tail = &alt_odb_list; |
dc732bd5 | 680 | link_alt_odb_entries(alt, PATH_SEP, NULL, 0); |
c2f493a4 MW |
681 | |
682 | read_info_alternates(get_object_directory(), 0); | |
683 | } | |
684 | ||
3096b2ec | 685 | /* Returns 1 if we have successfully freshened the file, 0 otherwise. */ |
33d4221c | 686 | static int freshen_file(const char *fn) |
ace1534d | 687 | { |
33d4221c JK |
688 | struct utimbuf t; |
689 | t.actime = t.modtime = time(NULL); | |
690 | return !utime(fn, &t); | |
0f4dc14a | 691 | } |
ace1534d | 692 | |
3096b2ec JK |
693 | /* |
694 | * All of the check_and_freshen functions return 1 if the file exists and was | |
695 | * freshened (if freshening was requested), 0 otherwise. If they return | |
696 | * 0, you should not assume that it is safe to skip a write of the object (it | |
697 | * either does not exist on disk, or has a stale mtime and may be subject to | |
698 | * pruning). | |
699 | */ | |
6a5e6f5e | 700 | int check_and_freshen_file(const char *fn, int freshen) |
33d4221c JK |
701 | { |
702 | if (access(fn, F_OK)) | |
703 | return 0; | |
3096b2ec | 704 | if (freshen && !freshen_file(fn)) |
33d4221c JK |
705 | return 0; |
706 | return 1; | |
707 | } | |
708 | ||
709 | static int check_and_freshen_local(const unsigned char *sha1, int freshen) | |
710 | { | |
711 | return check_and_freshen_file(sha1_file_name(sha1), freshen); | |
712 | } | |
713 | ||
714 | static int check_and_freshen_nonlocal(const unsigned char *sha1, int freshen) | |
0f4dc14a BC |
715 | { |
716 | struct alternate_object_database *alt; | |
9a217f2a | 717 | prepare_alt_odb(); |
d5a63b99 | 718 | for (alt = alt_odb_list; alt; alt = alt->next) { |
29ec6af2 JK |
719 | const char *path = alt_sha1_path(alt, sha1); |
720 | if (check_and_freshen_file(path, freshen)) | |
c529d75a | 721 | return 1; |
ace1534d | 722 | } |
c529d75a | 723 | return 0; |
ace1534d JH |
724 | } |
725 | ||
33d4221c JK |
726 | static int check_and_freshen(const unsigned char *sha1, int freshen) |
727 | { | |
728 | return check_and_freshen_local(sha1, freshen) || | |
729 | check_and_freshen_nonlocal(sha1, freshen); | |
730 | } | |
731 | ||
732 | int has_loose_object_nonlocal(const unsigned char *sha1) | |
733 | { | |
734 | return check_and_freshen_nonlocal(sha1, 0); | |
735 | } | |
736 | ||
0f4dc14a BC |
737 | static int has_loose_object(const unsigned char *sha1) |
738 | { | |
33d4221c | 739 | return check_and_freshen(sha1, 0); |
0f4dc14a BC |
740 | } |
741 | ||
02710228 SP |
742 | static void mmap_limit_check(size_t length) |
743 | { | |
744 | static size_t limit = 0; | |
745 | if (!limit) { | |
746 | limit = git_env_ulong("GIT_MMAP_LIMIT", 0); | |
747 | if (!limit) | |
748 | limit = SIZE_MAX; | |
749 | } | |
750 | if (length > limit) | |
751 | die("attempting to mmap %"PRIuMAX" over limit %"PRIuMAX, | |
752 | (uintmax_t)length, (uintmax_t)limit); | |
753 | } | |
754 | ||
1570856b JK |
755 | void *xmmap_gently(void *start, size_t length, |
756 | int prot, int flags, int fd, off_t offset) | |
58ecbd5e | 757 | { |
02710228 SP |
758 | void *ret; |
759 | ||
760 | mmap_limit_check(length); | |
761 | ret = mmap(start, length, prot, flags, fd, offset); | |
58ecbd5e JN |
762 | if (ret == MAP_FAILED) { |
763 | if (!length) | |
764 | return NULL; | |
7c3ecb32 | 765 | release_pack_memory(length); |
58ecbd5e | 766 | ret = mmap(start, length, prot, flags, fd, offset); |
58ecbd5e JN |
767 | } |
768 | return ret; | |
769 | } | |
770 | ||
1570856b JK |
771 | void *xmmap(void *start, size_t length, |
772 | int prot, int flags, int fd, off_t offset) | |
773 | { | |
774 | void *ret = xmmap_gently(start, length, prot, flags, fd, offset); | |
775 | if (ret == MAP_FAILED) | |
9ca0aaf6 | 776 | die_errno("mmap failed"); |
1570856b JK |
777 | return ret; |
778 | } | |
779 | ||
88d0db55 | 780 | /* |
090ea126 NTND |
781 | * With an in-core object data in "map", rehash it to make sure the |
782 | * object name actually matches "sha1" to detect object corruption. | |
783 | * With "map" == NULL, try reading the object named with "sha1" using | |
784 | * the streaming interface and rehash it to do the same. | |
88d0db55 | 785 | */ |
090ea126 NTND |
786 | int check_sha1_signature(const unsigned char *sha1, void *map, |
787 | unsigned long size, const char *type) | |
88d0db55 | 788 | { |
18e2588e | 789 | struct object_id real_oid; |
090ea126 NTND |
790 | enum object_type obj_type; |
791 | struct git_istream *st; | |
18e2588e | 792 | git_hash_ctx c; |
090ea126 NTND |
793 | char hdr[32]; |
794 | int hdrlen; | |
88d0db55 | 795 | |
090ea126 | 796 | if (map) { |
18e2588e | 797 | hash_sha1_file(map, size, type, real_oid.hash); |
798 | return hashcmp(sha1, real_oid.hash) ? -1 : 0; | |
88d0db55 BC |
799 | } |
800 | ||
090ea126 NTND |
801 | st = open_istream(sha1, &obj_type, &size, NULL); |
802 | if (!st) | |
803 | return -1; | |
88d0db55 | 804 | |
090ea126 | 805 | /* Generate the header */ |
ef1286d3 | 806 | hdrlen = xsnprintf(hdr, sizeof(hdr), "%s %lu", typename(obj_type), size) + 1; |
88d0db55 | 807 | |
090ea126 | 808 | /* Sha1.. */ |
18e2588e | 809 | the_hash_algo->init_fn(&c); |
810 | the_hash_algo->update_fn(&c, hdr, hdrlen); | |
090ea126 NTND |
811 | for (;;) { |
812 | char buf[1024 * 16]; | |
813 | ssize_t readlen = read_istream(st, buf, sizeof(buf)); | |
1f688557 | 814 | |
f54fac53 JK |
815 | if (readlen < 0) { |
816 | close_istream(st); | |
817 | return -1; | |
818 | } | |
090ea126 NTND |
819 | if (!readlen) |
820 | break; | |
18e2588e | 821 | the_hash_algo->update_fn(&c, buf, readlen); |
fa5fc15d | 822 | } |
18e2588e | 823 | the_hash_algo->final_fn(real_oid.hash, &c); |
090ea126 | 824 | close_istream(st); |
18e2588e | 825 | return hashcmp(sha1, real_oid.hash) ? -1 : 0; |
fa5fc15d SP |
826 | } |
827 | ||
1b8ac5ea | 828 | int git_open_cloexec(const char *name, int flags) |
a0788266 | 829 | { |
1e3001a8 JH |
830 | int fd; |
831 | static int o_cloexec = O_CLOEXEC; | |
a0788266 | 832 | |
1e3001a8 JH |
833 | fd = open(name, flags | o_cloexec); |
834 | if ((o_cloexec & O_CLOEXEC) && fd < 0 && errno == EINVAL) { | |
cd66ada0 | 835 | /* Try again w/o O_CLOEXEC: the kernel might not support it */ |
1e3001a8 JH |
836 | o_cloexec &= ~O_CLOEXEC; |
837 | fd = open(name, flags | o_cloexec); | |
491a8dec | 838 | } |
491a8dec | 839 | |
9fb9495d | 840 | #if defined(F_GETFD) && defined(F_SETFD) && defined(FD_CLOEXEC) |
491a8dec | 841 | { |
1e3001a8 | 842 | static int fd_cloexec = FD_CLOEXEC; |
a0788266 | 843 | |
1e3001a8 JH |
844 | if (!o_cloexec && 0 <= fd && fd_cloexec) { |
845 | /* Opened w/o O_CLOEXEC? try with fcntl(2) to add it */ | |
9fb9495d EW |
846 | int flags = fcntl(fd, F_GETFD); |
847 | if (fcntl(fd, F_SETFD, flags | fd_cloexec)) | |
1e3001a8 | 848 | fd_cloexec = 0; |
cd66ada0 | 849 | } |
44d1c19e | 850 | } |
a0788266 | 851 | #endif |
1b8ac5ea | 852 | return fd; |
a0788266 JS |
853 | } |
854 | ||
3cf8b462 | 855 | /* |
771e7d57 JK |
856 | * Find "sha1" as a loose object in the local repository or in an alternate. |
857 | * Returns 0 on success, negative on failure. | |
858 | * | |
859 | * The "path" out-parameter will give the path of the object we found (if any). | |
860 | * Note that it may point to static storage and is only valid until another | |
861 | * call to sha1_file_name(), etc. | |
3cf8b462 | 862 | */ |
771e7d57 JK |
863 | static int stat_sha1_file(const unsigned char *sha1, struct stat *st, |
864 | const char **path) | |
1f688557 | 865 | { |
052fe5ea | 866 | struct alternate_object_database *alt; |
d079837e | 867 | |
771e7d57 JK |
868 | *path = sha1_file_name(sha1); |
869 | if (!lstat(*path, st)) | |
052fe5ea | 870 | return 0; |
c7934306 | 871 | |
052fe5ea JK |
872 | prepare_alt_odb(); |
873 | errno = ENOENT; | |
874 | for (alt = alt_odb_list; alt; alt = alt->next) { | |
771e7d57 JK |
875 | *path = alt_sha1_path(alt, sha1); |
876 | if (!lstat(*path, st)) | |
052fe5ea | 877 | return 0; |
c7934306 SP |
878 | } |
879 | ||
3cf8b462 SP |
880 | return -1; |
881 | } | |
882 | ||
771e7d57 JK |
883 | /* |
884 | * Like stat_sha1_file(), but actually open the object and return the | |
885 | * descriptor. See the caveats on the "path" parameter above. | |
886 | */ | |
887 | static int open_sha1_file(const unsigned char *sha1, const char **path) | |
60bb8b14 | 888 | { |
44d1c19e | 889 | int fd; |
44d1c19e | 890 | struct alternate_object_database *alt; |
d6c8a05b | 891 | int most_interesting_errno; |
60bb8b14 | 892 | |
771e7d57 JK |
893 | *path = sha1_file_name(sha1); |
894 | fd = git_open(*path); | |
44d1c19e LT |
895 | if (fd >= 0) |
896 | return fd; | |
d6c8a05b | 897 | most_interesting_errno = errno; |
03e79c88 | 898 | |
44d1c19e | 899 | prepare_alt_odb(); |
44d1c19e | 900 | for (alt = alt_odb_list; alt; alt = alt->next) { |
771e7d57 JK |
901 | *path = alt_sha1_path(alt, sha1); |
902 | fd = git_open(*path); | |
44d1c19e LT |
903 | if (fd >= 0) |
904 | return fd; | |
d6c8a05b JK |
905 | if (most_interesting_errno == ENOENT) |
906 | most_interesting_errno = errno; | |
03e79c88 | 907 | } |
d6c8a05b | 908 | errno = most_interesting_errno; |
44d1c19e | 909 | return -1; |
1f688557 JH |
910 | } |
911 | ||
f6371f92 JK |
912 | /* |
913 | * Map the loose object at "path" if it is not NULL, or the path found by | |
914 | * searching for a loose object named "sha1". | |
915 | */ | |
916 | static void *map_sha1_file_1(const char *path, | |
917 | const unsigned char *sha1, | |
918 | unsigned long *size) | |
27d69a46 | 919 | { |
0fcfd160 | 920 | void *map; |
144bde78 | 921 | int fd; |
84dd81c1 | 922 | |
f6371f92 JK |
923 | if (path) |
924 | fd = git_open(path); | |
8261e1f1 | 925 | else |
f6371f92 | 926 | fd = open_sha1_file(sha1, &path); |
44d1c19e LT |
927 | map = NULL; |
928 | if (fd >= 0) { | |
929 | struct stat st; | |
1f688557 | 930 | |
44d1c19e LT |
931 | if (!fstat(fd, &st)) { |
932 | *size = xsize_t(st.st_size); | |
33e42de0 MM |
933 | if (!*size) { |
934 | /* mmap() is forbidden on empty files */ | |
771e7d57 | 935 | error("object file %s is empty", path); |
33e42de0 MM |
936 | return NULL; |
937 | } | |
44d1c19e | 938 | map = xmmap(NULL, *size, PROT_READ, MAP_PRIVATE, fd, 0); |
144bde78 | 939 | } |
44d1c19e | 940 | close(fd); |
74e34e1f | 941 | } |
0fcfd160 | 942 | return map; |
74e34e1f NP |
943 | } |
944 | ||
f6371f92 | 945 | void *map_sha1_file(const unsigned char *sha1, unsigned long *size) |
068f85e3 | 946 | { |
f6371f92 | 947 | return map_sha1_file_1(NULL, sha1, size); |
068f85e3 | 948 | } |
949 | ||
d21f8426 JH |
950 | static int unpack_sha1_short_header(git_zstream *stream, |
951 | unsigned char *map, unsigned long mapsize, | |
952 | void *buffer, unsigned long bufsiz) | |
47fe3f6e | 953 | { |
c4483576 LT |
954 | /* Get the data stream */ |
955 | memset(stream, 0, sizeof(*stream)); | |
956 | stream->next_in = map; | |
957 | stream->avail_in = mapsize; | |
958 | stream->next_out = buffer; | |
93821bd9 | 959 | stream->avail_out = bufsiz; |
47fe3f6e | 960 | |
39c68542 | 961 | git_inflate_init(stream); |
cc5c54e7 | 962 | return git_inflate(stream, 0); |
9a217f2a JH |
963 | } |
964 | ||
d21f8426 JH |
965 | int unpack_sha1_header(git_zstream *stream, |
966 | unsigned char *map, unsigned long mapsize, | |
967 | void *buffer, unsigned long bufsiz) | |
1f688557 | 968 | { |
d21f8426 JH |
969 | int status = unpack_sha1_short_header(stream, map, mapsize, |
970 | buffer, bufsiz); | |
42873078 | 971 | |
d21f8426 JH |
972 | if (status < Z_OK) |
973 | return status; | |
628522ec | 974 | |
d21f8426 JH |
975 | /* Make sure we have the terminating NUL */ |
976 | if (!memchr(buffer, '\0', stream->next_out - (unsigned char *)buffer)) | |
977 | return -1; | |
1f688557 JH |
978 | return 0; |
979 | } | |
980 | ||
46f03448 KN |
981 | static int unpack_sha1_header_to_strbuf(git_zstream *stream, unsigned char *map, |
982 | unsigned long mapsize, void *buffer, | |
983 | unsigned long bufsiz, struct strbuf *header) | |
d131b7af | 984 | { |
46f03448 KN |
985 | int status; |
986 | ||
d21f8426 JH |
987 | status = unpack_sha1_short_header(stream, map, mapsize, buffer, bufsiz); |
988 | if (status < Z_OK) | |
989 | return -1; | |
d131b7af | 990 | |
46f03448 KN |
991 | /* |
992 | * Check if entire header is unpacked in the first iteration. | |
d131b7af | 993 | */ |
46f03448 KN |
994 | if (memchr(buffer, '\0', stream->next_out - (unsigned char *)buffer)) |
995 | return 0; | |
d131b7af | 996 | |
46f03448 KN |
997 | /* |
998 | * buffer[0..bufsiz] was not large enough. Copy the partial | |
999 | * result out to header, and then append the result of further | |
1000 | * reading the stream. | |
1001 | */ | |
1002 | strbuf_add(header, buffer, stream->next_out - (unsigned char *)buffer); | |
1003 | stream->next_out = buffer; | |
1004 | stream->avail_out = bufsiz; | |
d131b7af | 1005 | |
46f03448 KN |
1006 | do { |
1007 | status = git_inflate(stream, 0); | |
1008 | strbuf_add(header, buffer, stream->next_out - (unsigned char *)buffer); | |
1009 | if (memchr(buffer, '\0', stream->next_out - (unsigned char *)buffer)) | |
1010 | return 0; | |
1011 | stream->next_out = buffer; | |
1012 | stream->avail_out = bufsiz; | |
1013 | } while (status != Z_STREAM_END); | |
1014 | return -1; | |
d131b7af SP |
1015 | } |
1016 | ||
ef49a7a0 | 1017 | static void *unpack_sha1_rest(git_zstream *stream, void *buffer, unsigned long size, const unsigned char *sha1) |
95099731 | 1018 | { |
5180cacc | 1019 | int bytes = strlen(buffer) + 1; |
3aee68aa | 1020 | unsigned char *buf = xmallocz(size); |
93821bd9 | 1021 | unsigned long n; |
7efbff75 | 1022 | int status = Z_OK; |
95099731 | 1023 | |
93821bd9 LT |
1024 | n = stream->total_out - bytes; |
1025 | if (n > size) | |
1026 | n = size; | |
1027 | memcpy(buf, (char *) buffer + bytes, n); | |
1028 | bytes = n; | |
456cdf6e LT |
1029 | if (bytes <= size) { |
1030 | /* | |
1031 | * The above condition must be (bytes <= size), not | |
1032 | * (bytes < size). In other words, even though we | |
ccf5ace0 | 1033 | * expect no more output and set avail_out to zero, |
456cdf6e LT |
1034 | * the input zlib stream may have bytes that express |
1035 | * "this concludes the stream", and we *do* want to | |
1036 | * eat that input. | |
1037 | * | |
1038 | * Otherwise we would not be able to test that we | |
1039 | * consumed all the input to reach the expected size; | |
1040 | * we also want to check that zlib tells us that all | |
1041 | * went well with status == Z_STREAM_END at the end. | |
1042 | */ | |
5180cacc LT |
1043 | stream->next_out = buf + bytes; |
1044 | stream->avail_out = size - bytes; | |
7efbff75 | 1045 | while (status == Z_OK) |
39c68542 | 1046 | status = git_inflate(stream, Z_FINISH); |
5180cacc | 1047 | } |
456cdf6e | 1048 | if (status == Z_STREAM_END && !stream->avail_in) { |
39c68542 | 1049 | git_inflate_end(stream); |
7efbff75 | 1050 | return buf; |
95099731 NTND |
1051 | } |
1052 | ||
7efbff75 JH |
1053 | if (status < 0) |
1054 | error("corrupt loose object '%s'", sha1_to_hex(sha1)); | |
1055 | else if (stream->avail_in) | |
1056 | error("garbage at end of loose object '%s'", | |
1057 | sha1_to_hex(sha1)); | |
1058 | free(buf); | |
1059 | return NULL; | |
95099731 NTND |
1060 | } |
1061 | ||
d40d535b | 1062 | /* |
5180cacc LT |
1063 | * We used to just use "sscanf()", but that's actually way |
1064 | * too permissive for what we want to check. So do an anal | |
1065 | * object header parse by hand. | |
d40d535b | 1066 | */ |
46f03448 KN |
1067 | static int parse_sha1_header_extended(const char *hdr, struct object_info *oi, |
1068 | unsigned int flags) | |
1f688557 | 1069 | { |
46f03448 | 1070 | const char *type_buf = hdr; |
5180cacc | 1071 | unsigned long size; |
46f03448 | 1072 | int type, type_len = 0; |
43057304 | 1073 | |
5180cacc | 1074 | /* |
46f03448 | 1075 | * The type can be of any size but is followed by |
21666f1a | 1076 | * a space. |
5180cacc | 1077 | */ |
5180cacc LT |
1078 | for (;;) { |
1079 | char c = *hdr++; | |
d21f8426 JH |
1080 | if (!c) |
1081 | return -1; | |
5180cacc LT |
1082 | if (c == ' ') |
1083 | break; | |
46f03448 | 1084 | type_len++; |
5180cacc | 1085 | } |
1f688557 | 1086 | |
46f03448 KN |
1087 | type = type_from_string_gently(type_buf, type_len, 1); |
1088 | if (oi->typename) | |
1089 | strbuf_add(oi->typename, type_buf, type_len); | |
1090 | /* | |
1091 | * Set type to 0 if its an unknown object and | |
2e3a16b2 | 1092 | * we're obtaining the type using '--allow-unknown-type' |
46f03448 KN |
1093 | * option. |
1094 | */ | |
19fc5e84 | 1095 | if ((flags & OBJECT_INFO_ALLOW_UNKNOWN_TYPE) && (type < 0)) |
46f03448 KN |
1096 | type = 0; |
1097 | else if (type < 0) | |
1098 | die("invalid object type"); | |
1099 | if (oi->typep) | |
1100 | *oi->typep = type; | |
5180cacc LT |
1101 | |
1102 | /* | |
1103 | * The length must follow immediately, and be in canonical | |
1104 | * decimal format (ie "010" is not valid). | |
1105 | */ | |
1106 | size = *hdr++ - '0'; | |
1107 | if (size > 9) | |
1108 | return -1; | |
1109 | if (size) { | |
1110 | for (;;) { | |
1111 | unsigned long c = *hdr - '0'; | |
1112 | if (c > 9) | |
1113 | break; | |
1114 | hdr++; | |
1115 | size = size * 10 + c; | |
1b1005d1 | 1116 | } |
c01f51cc | 1117 | } |
46f03448 KN |
1118 | |
1119 | if (oi->sizep) | |
1120 | *oi->sizep = size; | |
5180cacc LT |
1121 | |
1122 | /* | |
1123 | * The length must be followed by a zero byte | |
1124 | */ | |
46f03448 | 1125 | return *hdr ? -1 : type; |
1f688557 JH |
1126 | } |
1127 | ||
46f03448 | 1128 | int parse_sha1_header(const char *hdr, unsigned long *sizep) |
bf592c50 | 1129 | { |
27b5c1a0 | 1130 | struct object_info oi = OBJECT_INFO_INIT; |
21666f1a | 1131 | |
46f03448 | 1132 | oi.sizep = sizep; |
1f0c0d36 | 1133 | return parse_sha1_header_extended(hdr, &oi, 0); |
bf592c50 DB |
1134 | } |
1135 | ||
052fe5ea | 1136 | static int sha1_loose_object_info(const unsigned char *sha1, |
46f03448 KN |
1137 | struct object_info *oi, |
1138 | int flags) | |
65c2e0c3 | 1139 | { |
46f03448 KN |
1140 | int status = 0; |
1141 | unsigned long mapsize; | |
65c2e0c3 | 1142 | void *map; |
ef49a7a0 | 1143 | git_zstream stream; |
d65a16f6 | 1144 | char hdr[32]; |
46f03448 | 1145 | struct strbuf hdrbuf = STRBUF_INIT; |
c84a1f3e | 1146 | unsigned long size_scratch; |
65c2e0c3 | 1147 | |
5d642e75 JK |
1148 | if (oi->delta_base_sha1) |
1149 | hashclr(oi->delta_base_sha1); | |
1150 | ||
052fe5ea JK |
1151 | /* |
1152 | * If we don't care about type or size, then we don't | |
4ef8d1dd JH |
1153 | * need to look inside the object at all. Note that we |
1154 | * do not optimize out the stat call, even if the | |
1155 | * caller doesn't care about the disk-size, since our | |
1156 | * return value implicitly indicates whether the | |
1157 | * object even exists. | |
052fe5ea | 1158 | */ |
c84a1f3e | 1159 | if (!oi->typep && !oi->typename && !oi->sizep && !oi->contentp) { |
771e7d57 | 1160 | const char *path; |
4ef8d1dd | 1161 | struct stat st; |
771e7d57 | 1162 | if (stat_sha1_file(sha1, &st, &path) < 0) |
4ef8d1dd JH |
1163 | return -1; |
1164 | if (oi->disk_sizep) | |
23c339c0 | 1165 | *oi->disk_sizep = st.st_size; |
052fe5ea JK |
1166 | return 0; |
1167 | } | |
1168 | ||
bb6b8e4f | 1169 | map = map_sha1_file(sha1, &mapsize); |
f0df4ed5 | 1170 | if (!map) |
dbea72a8 | 1171 | return -1; |
c84a1f3e JT |
1172 | |
1173 | if (!oi->sizep) | |
1174 | oi->sizep = &size_scratch; | |
1175 | ||
23c339c0 JK |
1176 | if (oi->disk_sizep) |
1177 | *oi->disk_sizep = mapsize; | |
19fc5e84 | 1178 | if ((flags & OBJECT_INFO_ALLOW_UNKNOWN_TYPE)) { |
46f03448 KN |
1179 | if (unpack_sha1_header_to_strbuf(&stream, map, mapsize, hdr, sizeof(hdr), &hdrbuf) < 0) |
1180 | status = error("unable to unpack %s header with --allow-unknown-type", | |
1181 | sha1_to_hex(sha1)); | |
1182 | } else if (unpack_sha1_header(&stream, map, mapsize, hdr, sizeof(hdr)) < 0) | |
36e4d74a JH |
1183 | status = error("unable to unpack %s header", |
1184 | sha1_to_hex(sha1)); | |
46f03448 KN |
1185 | if (status < 0) |
1186 | ; /* Do nothing */ | |
1187 | else if (hdrbuf.len) { | |
1188 | if ((status = parse_sha1_header_extended(hdrbuf.buf, oi, flags)) < 0) | |
1189 | status = error("unable to parse %s header with --allow-unknown-type", | |
1190 | sha1_to_hex(sha1)); | |
1191 | } else if ((status = parse_sha1_header_extended(hdr, oi, flags)) < 0) | |
36e4d74a | 1192 | status = error("unable to parse %s header", sha1_to_hex(sha1)); |
c84a1f3e | 1193 | |
b3ea7dd3 | 1194 | if (status >= 0 && oi->contentp) { |
c84a1f3e JT |
1195 | *oi->contentp = unpack_sha1_rest(&stream, hdr, |
1196 | *oi->sizep, sha1); | |
b3ea7dd3 JK |
1197 | if (!*oi->contentp) { |
1198 | git_inflate_end(&stream); | |
1199 | status = -1; | |
1200 | } | |
1201 | } else | |
c84a1f3e JT |
1202 | git_inflate_end(&stream); |
1203 | ||
65c2e0c3 | 1204 | munmap(map, mapsize); |
46f03448 | 1205 | if (status && oi->typep) |
23c339c0 | 1206 | *oi->typep = status; |
c84a1f3e JT |
1207 | if (oi->sizep == &size_scratch) |
1208 | oi->sizep = NULL; | |
46f03448 | 1209 | strbuf_release(&hdrbuf); |
3ab0fb06 | 1210 | oi->whence = OI_LOOSE; |
93cff9a9 | 1211 | return (status < 0) ? status : 0; |
65c2e0c3 JH |
1212 | } |
1213 | ||
de7b5d62 | 1214 | int sha1_object_info_extended(const unsigned char *sha1, struct object_info *oi, unsigned flags) |
f0df4ed5 | 1215 | { |
cd585e2a | 1216 | static struct object_info blank_oi = OBJECT_INFO_INIT; |
f0df4ed5 | 1217 | struct pack_entry e; |
5b086407 | 1218 | int rtype; |
1f0c0d36 JT |
1219 | const unsigned char *real = (flags & OBJECT_INFO_LOOKUP_REPLACE) ? |
1220 | lookup_replace_object(sha1) : | |
1221 | sha1; | |
f0df4ed5 | 1222 | |
87b5e236 JK |
1223 | if (is_null_sha1(real)) |
1224 | return -1; | |
1225 | ||
cd585e2a JT |
1226 | if (!oi) |
1227 | oi = &blank_oi; | |
1228 | ||
dfdd4afc JT |
1229 | if (!(flags & OBJECT_INFO_SKIP_CACHED)) { |
1230 | struct cached_object *co = find_cached_object(real); | |
1231 | if (co) { | |
1232 | if (oi->typep) | |
1233 | *(oi->typep) = co->type; | |
1234 | if (oi->sizep) | |
1235 | *(oi->sizep) = co->size; | |
1236 | if (oi->disk_sizep) | |
1237 | *(oi->disk_sizep) = 0; | |
1238 | if (oi->delta_base_sha1) | |
1239 | hashclr(oi->delta_base_sha1); | |
1240 | if (oi->typename) | |
1241 | strbuf_addstr(oi->typename, typename(co->type)); | |
1242 | if (oi->contentp) | |
1243 | *oi->contentp = xmemdupz(co->buf, co->size); | |
1244 | oi->whence = OI_CACHED; | |
1245 | return 0; | |
1246 | } | |
c4d9986f NTND |
1247 | } |
1248 | ||
1f7117ef | 1249 | if (!find_pack_entry(real, &e)) { |
ddd63e64 | 1250 | /* Most likely it's a loose object. */ |
3ab0fb06 | 1251 | if (!sha1_loose_object_info(real, oi, flags)) |
5b086407 | 1252 | return 0; |
ddd63e64 SG |
1253 | |
1254 | /* Not a loose object; someone else may have just packed it. */ | |
dfdd4afc | 1255 | if (flags & OBJECT_INFO_QUICK) { |
052fe5ea | 1256 | return -1; |
dfdd4afc JT |
1257 | } else { |
1258 | reprepare_packed_git(); | |
1259 | if (!find_pack_entry(real, &e)) | |
1260 | return -1; | |
1261 | } | |
f0df4ed5 | 1262 | } |
3d77d877 | 1263 | |
cd585e2a JT |
1264 | if (oi == &blank_oi) |
1265 | /* | |
1266 | * We know that the caller doesn't actually need the | |
1267 | * information below, so return early. | |
1268 | */ | |
1269 | return 0; | |
46f03448 | 1270 | |
23c339c0 | 1271 | rtype = packed_object_info(e.p, e.offset, oi); |
412916ee | 1272 | if (rtype < 0) { |
1f7117ef CC |
1273 | mark_bad_packed_object(e.p, real); |
1274 | return sha1_object_info_extended(real, oi, 0); | |
3ab0fb06 | 1275 | } else if (oi->whence == OI_PACKED) { |
9a490590 JH |
1276 | oi->u.packed.offset = e.offset; |
1277 | oi->u.packed.pack = e.p; | |
1278 | oi->u.packed.is_delta = (rtype == OBJ_REF_DELTA || | |
1279 | rtype == OBJ_OFS_DELTA); | |
3d77d877 NP |
1280 | } |
1281 | ||
5b086407 | 1282 | return 0; |
f0df4ed5 JS |
1283 | } |
1284 | ||
3fc0dca9 | 1285 | /* returns enum object_type or negative */ |
9a490590 JH |
1286 | int sha1_object_info(const unsigned char *sha1, unsigned long *sizep) |
1287 | { | |
5b086407 | 1288 | enum object_type type; |
27b5c1a0 | 1289 | struct object_info oi = OBJECT_INFO_INIT; |
9a490590 | 1290 | |
5b086407 | 1291 | oi.typep = &type; |
9a490590 | 1292 | oi.sizep = sizep; |
1f0c0d36 JT |
1293 | if (sha1_object_info_extended(sha1, &oi, |
1294 | OBJECT_INFO_LOOKUP_REPLACE) < 0) | |
5b086407 JK |
1295 | return -1; |
1296 | return type; | |
9a490590 JH |
1297 | } |
1298 | ||
f1d8130b JT |
1299 | static void *read_object(const unsigned char *sha1, enum object_type *type, |
1300 | unsigned long *size) | |
1301 | { | |
1302 | struct object_info oi = OBJECT_INFO_INIT; | |
1303 | void *content; | |
1304 | oi.typep = type; | |
1305 | oi.sizep = size; | |
1306 | oi.contentp = &content; | |
1307 | ||
1308 | if (sha1_object_info_extended(sha1, &oi, 0) < 0) | |
1309 | return NULL; | |
1310 | return content; | |
1311 | } | |
1312 | ||
21666f1a NP |
1313 | int pretend_sha1_file(void *buf, unsigned long len, enum object_type type, |
1314 | unsigned char *sha1) | |
d66b37bb JH |
1315 | { |
1316 | struct cached_object *co; | |
1317 | ||
21666f1a | 1318 | hash_sha1_file(buf, len, typename(type), sha1); |
d66b37bb JH |
1319 | if (has_sha1_file(sha1) || find_cached_object(sha1)) |
1320 | return 0; | |
c7353967 | 1321 | ALLOC_GROW(cached_objects, cached_object_nr + 1, cached_object_alloc); |
d66b37bb JH |
1322 | co = &cached_objects[cached_object_nr++]; |
1323 | co->size = len; | |
21666f1a | 1324 | co->type = type; |
efa13f7b JH |
1325 | co->buf = xmalloc(len); |
1326 | memcpy(co->buf, buf, len); | |
d66b37bb JH |
1327 | hashcpy(co->sha1, sha1); |
1328 | return 0; | |
1329 | } | |
1330 | ||
b6c4cecc JH |
1331 | /* |
1332 | * This function dies on corrupt objects; the callers who want to | |
1333 | * deal with them should arrange to call read_object() and give error | |
1334 | * messages themselves. | |
1335 | */ | |
5bf29b95 JH |
1336 | void *read_sha1_file_extended(const unsigned char *sha1, |
1337 | enum object_type *type, | |
1338 | unsigned long *size, | |
1f0c0d36 | 1339 | int lookup_replace) |
ac939109 | 1340 | { |
3ba7a065 | 1341 | void *data; |
b6c4cecc | 1342 | const struct packed_git *p; |
771e7d57 JK |
1343 | const char *path; |
1344 | struct stat st; | |
1f0c0d36 JT |
1345 | const unsigned char *repl = lookup_replace ? lookup_replace_object(sha1) |
1346 | : sha1; | |
b6c4cecc | 1347 | |
3ba7a065 JH |
1348 | errno = 0; |
1349 | data = read_object(repl, type, size); | |
4bbf5a26 | 1350 | if (data) |
b6c4cecc | 1351 | return data; |
68095570 | 1352 | |
25f3af3f | 1353 | if (errno && errno != ENOENT) |
3ba7a065 JH |
1354 | die_errno("failed to read object %s", sha1_to_hex(sha1)); |
1355 | ||
68095570 | 1356 | /* die if we replaced an object with one that does not exist */ |
b6c4cecc | 1357 | if (repl != sha1) |
68095570 CC |
1358 | die("replacement %s not found for %s", |
1359 | sha1_to_hex(repl), sha1_to_hex(sha1)); | |
1360 | ||
771e7d57 | 1361 | if (!stat_sha1_file(repl, &st, &path)) |
b6c4cecc JH |
1362 | die("loose object %s (stored in %s) is corrupt", |
1363 | sha1_to_hex(repl), path); | |
68095570 | 1364 | |
b6c4cecc JH |
1365 | if ((p = has_packed_and_bad(repl)) != NULL) |
1366 | die("packed object %s (stored in %s) is corrupt", | |
1367 | sha1_to_hex(repl), p->pack_name); | |
f5552aee | 1368 | |
b6c4cecc | 1369 | return NULL; |
ac939109 NP |
1370 | } |
1371 | ||
40469ee9 | 1372 | void *read_object_with_reference(const unsigned char *sha1, |
21666f1a | 1373 | const char *required_type_name, |
40469ee9 JH |
1374 | unsigned long *size, |
1375 | unsigned char *actual_sha1_return) | |
f4913f91 | 1376 | { |
21666f1a | 1377 | enum object_type type, required_type; |
f4913f91 JH |
1378 | void *buffer; |
1379 | unsigned long isize; | |
40469ee9 | 1380 | unsigned char actual_sha1[20]; |
f4913f91 | 1381 | |
21666f1a | 1382 | required_type = type_from_string(required_type_name); |
e702496e | 1383 | hashcpy(actual_sha1, sha1); |
40469ee9 JH |
1384 | while (1) { |
1385 | int ref_length = -1; | |
1386 | const char *ref_type = NULL; | |
f4913f91 | 1387 | |
21666f1a | 1388 | buffer = read_sha1_file(actual_sha1, &type, &isize); |
40469ee9 JH |
1389 | if (!buffer) |
1390 | return NULL; | |
21666f1a | 1391 | if (type == required_type) { |
40469ee9 JH |
1392 | *size = isize; |
1393 | if (actual_sha1_return) | |
e702496e | 1394 | hashcpy(actual_sha1_return, actual_sha1); |
40469ee9 JH |
1395 | return buffer; |
1396 | } | |
1397 | /* Handle references */ | |
21666f1a | 1398 | else if (type == OBJ_COMMIT) |
40469ee9 | 1399 | ref_type = "tree "; |
21666f1a | 1400 | else if (type == OBJ_TAG) |
40469ee9 JH |
1401 | ref_type = "object "; |
1402 | else { | |
1403 | free(buffer); | |
1404 | return NULL; | |
1405 | } | |
1406 | ref_length = strlen(ref_type); | |
f4913f91 | 1407 | |
50974ec9 MK |
1408 | if (ref_length + 40 > isize || |
1409 | memcmp(buffer, ref_type, ref_length) || | |
1d7f171c | 1410 | get_sha1_hex((char *) buffer + ref_length, actual_sha1)) { |
40469ee9 JH |
1411 | free(buffer); |
1412 | return NULL; | |
1413 | } | |
1cf58e72 | 1414 | free(buffer); |
40469ee9 JH |
1415 | /* Now we have the ID of the referred-to object in |
1416 | * actual_sha1. Check again. */ | |
f4913f91 | 1417 | } |
f4913f91 JH |
1418 | } |
1419 | ||
ce9fbf16 | 1420 | static void write_sha1_file_prepare(const void *buf, unsigned long len, |
972a9155 | 1421 | const char *type, unsigned char *sha1, |
d65a16f6 | 1422 | char *hdr, int *hdrlen) |
d410c0f5 | 1423 | { |
18e2588e | 1424 | git_hash_ctx c; |
d410c0f5 JH |
1425 | |
1426 | /* Generate the header */ | |
ef1286d3 | 1427 | *hdrlen = xsnprintf(hdr, *hdrlen, "%s %lu", type, len)+1; |
d410c0f5 JH |
1428 | |
1429 | /* Sha1.. */ | |
18e2588e | 1430 | the_hash_algo->init_fn(&c); |
1431 | the_hash_algo->update_fn(&c, hdr, *hdrlen); | |
1432 | the_hash_algo->update_fn(&c, buf, len); | |
1433 | the_hash_algo->final_fn(sha1, &c); | |
d410c0f5 JH |
1434 | } |
1435 | ||
230f1322 | 1436 | /* |
5a688fe4 | 1437 | * Move the just written object into its final resting place. |
230f1322 | 1438 | */ |
cb5add58 | 1439 | int finalize_object_file(const char *tmpfile, const char *filename) |
230f1322 | 1440 | { |
e32c0a9c | 1441 | int ret = 0; |
5a688fe4 | 1442 | |
348df166 | 1443 | if (object_creation_mode == OBJECT_CREATION_USES_RENAMES) |
be66a6c4 JS |
1444 | goto try_rename; |
1445 | else if (link(tmpfile, filename)) | |
e32c0a9c | 1446 | ret = errno; |
7ebb6fca LT |
1447 | |
1448 | /* | |
1449 | * Coda hack - coda doesn't like cross-directory links, | |
1450 | * so we fall back to a rename, which will mean that it | |
1451 | * won't be able to check collisions, but that's not a | |
1452 | * big deal. | |
1453 | * | |
1454 | * The same holds for FAT formatted media. | |
1455 | * | |
3be1f18e | 1456 | * When this succeeds, we just return. We have nothing |
7ebb6fca LT |
1457 | * left to unlink. |
1458 | */ | |
1459 | if (ret && ret != EEXIST) { | |
be66a6c4 | 1460 | try_rename: |
7ebb6fca | 1461 | if (!rename(tmpfile, filename)) |
3be1f18e | 1462 | goto out; |
9e48b389 | 1463 | ret = errno; |
230f1322 | 1464 | } |
691f1a28 | 1465 | unlink_or_warn(tmpfile); |
230f1322 LT |
1466 | if (ret) { |
1467 | if (ret != EEXIST) { | |
7616c6ca | 1468 | return error_errno("unable to write sha1 filename %s", filename); |
230f1322 LT |
1469 | } |
1470 | /* FIXME!!! Collision check here ? */ | |
1471 | } | |
1472 | ||
3be1f18e | 1473 | out: |
5256b006 | 1474 | if (adjust_shared_perm(filename)) |
5a688fe4 | 1475 | return error("unable to set permission to '%s'", filename); |
230f1322 LT |
1476 | return 0; |
1477 | } | |
1478 | ||
4d548150 LT |
1479 | static int write_buffer(int fd, const void *buf, size_t len) |
1480 | { | |
d34cf19b | 1481 | if (write_in_full(fd, buf, len) < 0) |
7616c6ca | 1482 | return error_errno("file write error"); |
4d548150 LT |
1483 | return 0; |
1484 | } | |
1485 | ||
ce9fbf16 | 1486 | int hash_sha1_file(const void *buf, unsigned long len, const char *type, |
abdc3fc8 RS |
1487 | unsigned char *sha1) |
1488 | { | |
d65a16f6 | 1489 | char hdr[32]; |
ef1286d3 | 1490 | int hdrlen = sizeof(hdr); |
abdc3fc8 RS |
1491 | write_sha1_file_prepare(buf, len, type, sha1, hdr, &hdrlen); |
1492 | return 0; | |
1493 | } | |
1494 | ||
e9039dd3 LT |
1495 | /* Finalize a file on disk, and close it. */ |
1496 | static void close_sha1_file(int fd) | |
1497 | { | |
aafe9fba LT |
1498 | if (fsync_object_files) |
1499 | fsync_or_die(fd, "sha1 file"); | |
e9039dd3 | 1500 | if (close(fd) != 0) |
d824cbba | 1501 | die_errno("error when closing sha1 file"); |
e9039dd3 LT |
1502 | } |
1503 | ||
5723fe7e LT |
1504 | /* Size of directory component, including the ending '/' */ |
1505 | static inline int directory_size(const char *filename) | |
1506 | { | |
1507 | const char *s = strrchr(filename, '/'); | |
1508 | if (!s) | |
1509 | return 0; | |
1510 | return s - filename + 1; | |
1511 | } | |
1512 | ||
1513 | /* | |
1514 | * This creates a temporary file in the same directory as the final | |
1515 | * 'filename' | |
1516 | * | |
1517 | * We want to avoid cross-directory filename renames, because those | |
1518 | * can have problems on various filesystems (FAT, NFS, Coda). | |
1519 | */ | |
d4b3d11a | 1520 | static int create_tmpfile(struct strbuf *tmp, const char *filename) |
5723fe7e LT |
1521 | { |
1522 | int fd, dirlen = directory_size(filename); | |
1523 | ||
d4b3d11a JK |
1524 | strbuf_reset(tmp); |
1525 | strbuf_add(tmp, filename, dirlen); | |
1526 | strbuf_addstr(tmp, "tmp_obj_XXXXXX"); | |
1527 | fd = git_mkstemp_mode(tmp->buf, 0444); | |
cbacbf4e | 1528 | if (fd < 0 && dirlen && errno == ENOENT) { |
d4b3d11a JK |
1529 | /* |
1530 | * Make sure the directory exists; note that the contents | |
1531 | * of the buffer are undefined after mkstemp returns an | |
1532 | * error, so we have to rewrite the whole buffer from | |
1533 | * scratch. | |
1534 | */ | |
1535 | strbuf_reset(tmp); | |
1536 | strbuf_add(tmp, filename, dirlen - 1); | |
1537 | if (mkdir(tmp->buf, 0777) && errno != EEXIST) | |
b2476a60 | 1538 | return -1; |
d4b3d11a | 1539 | if (adjust_shared_perm(tmp->buf)) |
5723fe7e LT |
1540 | return -1; |
1541 | ||
1542 | /* Try again */ | |
d4b3d11a JK |
1543 | strbuf_addstr(tmp, "/tmp_obj_XXXXXX"); |
1544 | fd = git_mkstemp_mode(tmp->buf, 0444); | |
5723fe7e LT |
1545 | } |
1546 | return fd; | |
1547 | } | |
1548 | ||
bbac7311 | 1549 | static int write_loose_object(const unsigned char *sha1, char *hdr, int hdrlen, |
c00e657d | 1550 | const void *buf, unsigned long len, time_t mtime) |
0fcfd160 | 1551 | { |
915308b1 | 1552 | int fd, ret; |
9892beba | 1553 | unsigned char compressed[4096]; |
ef49a7a0 | 1554 | git_zstream stream; |
18e2588e | 1555 | git_hash_ctx c; |
1556 | struct object_id parano_oid; | |
d4b3d11a | 1557 | static struct strbuf tmp_file = STRBUF_INIT; |
30d6c6ea | 1558 | const char *filename = sha1_file_name(sha1); |
a44c9a5e | 1559 | |
d4b3d11a | 1560 | fd = create_tmpfile(&tmp_file, filename); |
aac17941 | 1561 | if (fd < 0) { |
35243577 | 1562 | if (errno == EACCES) |
82247e9b | 1563 | return error("insufficient permission for adding an object to repository database %s", get_object_directory()); |
916d081b | 1564 | else |
7616c6ca | 1565 | return error_errno("unable to create temporary file"); |
aac17941 LT |
1566 | } |
1567 | ||
0fcfd160 | 1568 | /* Set it up */ |
55bb5c91 | 1569 | git_deflate_init(&stream, zlib_compression_level); |
0fcfd160 | 1570 | stream.next_out = compressed; |
9892beba | 1571 | stream.avail_out = sizeof(compressed); |
18e2588e | 1572 | the_hash_algo->init_fn(&c); |
a44c9a5e LT |
1573 | |
1574 | /* First header.. */ | |
d65a16f6 | 1575 | stream.next_in = (unsigned char *)hdr; |
a44c9a5e | 1576 | stream.avail_in = hdrlen; |
55bb5c91 JH |
1577 | while (git_deflate(&stream, 0) == Z_OK) |
1578 | ; /* nothing */ | |
18e2588e | 1579 | the_hash_algo->update_fn(&c, hdr, hdrlen); |
a44c9a5e LT |
1580 | |
1581 | /* Then the data itself.. */ | |
c00e657d | 1582 | stream.next_in = (void *)buf; |
a44c9a5e | 1583 | stream.avail_in = len; |
9892beba | 1584 | do { |
748af44c | 1585 | unsigned char *in0 = stream.next_in; |
55bb5c91 | 1586 | ret = git_deflate(&stream, Z_FINISH); |
18e2588e | 1587 | the_hash_algo->update_fn(&c, in0, stream.next_in - in0); |
9892beba NP |
1588 | if (write_buffer(fd, compressed, stream.next_out - compressed) < 0) |
1589 | die("unable to write sha1 file"); | |
1590 | stream.next_out = compressed; | |
1591 | stream.avail_out = sizeof(compressed); | |
1592 | } while (ret == Z_OK); | |
1593 | ||
ac54c277 LT |
1594 | if (ret != Z_STREAM_END) |
1595 | die("unable to deflate new object %s (%d)", sha1_to_hex(sha1), ret); | |
55bb5c91 | 1596 | ret = git_deflate_end_gently(&stream); |
ac54c277 LT |
1597 | if (ret != Z_OK) |
1598 | die("deflateEnd on object %s failed (%d)", sha1_to_hex(sha1), ret); | |
18e2588e | 1599 | the_hash_algo->final_fn(parano_oid.hash, &c); |
1600 | if (hashcmp(sha1, parano_oid.hash) != 0) | |
748af44c | 1601 | die("confused by unstable object source data for %s", sha1_to_hex(sha1)); |
ac54c277 | 1602 | |
e9039dd3 | 1603 | close_sha1_file(fd); |
0fcfd160 | 1604 | |
bbac7311 NP |
1605 | if (mtime) { |
1606 | struct utimbuf utb; | |
1607 | utb.actime = mtime; | |
1608 | utb.modtime = mtime; | |
d4b3d11a | 1609 | if (utime(tmp_file.buf, &utb) < 0) |
7616c6ca | 1610 | warning_errno("failed utime() on %s", tmp_file.buf); |
bbac7311 NP |
1611 | } |
1612 | ||
d4b3d11a | 1613 | return finalize_object_file(tmp_file.buf, filename); |
0fcfd160 | 1614 | } |
8237b185 | 1615 | |
33d4221c JK |
1616 | static int freshen_loose_object(const unsigned char *sha1) |
1617 | { | |
1618 | return check_and_freshen(sha1, 1); | |
1619 | } | |
1620 | ||
1621 | static int freshen_packed_object(const unsigned char *sha1) | |
1622 | { | |
1623 | struct pack_entry e; | |
ee1c6c34 JK |
1624 | if (!find_pack_entry(sha1, &e)) |
1625 | return 0; | |
1626 | if (e.p->freshened) | |
1627 | return 1; | |
1628 | if (!freshen_file(e.p->pack_name)) | |
1629 | return 0; | |
1630 | e.p->freshened = 1; | |
1631 | return 1; | |
33d4221c JK |
1632 | } |
1633 | ||
1427a7ff | 1634 | int write_sha1_file(const void *buf, unsigned long len, const char *type, unsigned char *sha1) |
bbac7311 | 1635 | { |
bbac7311 | 1636 | char hdr[32]; |
ef1286d3 | 1637 | int hdrlen = sizeof(hdr); |
bbac7311 NP |
1638 | |
1639 | /* Normally if we have it in the pack then we do not bother writing | |
1640 | * it out into .git/objects/??/?{38} file. | |
1641 | */ | |
1642 | write_sha1_file_prepare(buf, len, type, sha1, hdr, &hdrlen); | |
b5f52f37 | 1643 | if (freshen_packed_object(sha1) || freshen_loose_object(sha1)) |
bbac7311 NP |
1644 | return 0; |
1645 | return write_loose_object(sha1, hdr, hdrlen, buf, len, 0); | |
1646 | } | |
1647 | ||
0c3db67c | 1648 | int hash_sha1_file_literally(const void *buf, unsigned long len, const char *type, |
da77611d | 1649 | struct object_id *oid, unsigned flags) |
0c3db67c ES |
1650 | { |
1651 | char *header; | |
1652 | int hdrlen, status = 0; | |
1653 | ||
1654 | /* type string, SP, %lu of the length plus NUL must fit this */ | |
ef1286d3 JK |
1655 | hdrlen = strlen(type) + 32; |
1656 | header = xmalloc(hdrlen); | |
da77611d | 1657 | write_sha1_file_prepare(buf, len, type, oid->hash, header, &hdrlen); |
0c3db67c ES |
1658 | |
1659 | if (!(flags & HASH_WRITE_OBJECT)) | |
1660 | goto cleanup; | |
da77611d | 1661 | if (freshen_packed_object(oid->hash) || freshen_loose_object(oid->hash)) |
0c3db67c | 1662 | goto cleanup; |
da77611d | 1663 | status = write_loose_object(oid->hash, header, hdrlen, buf, len, 0); |
0c3db67c ES |
1664 | |
1665 | cleanup: | |
1666 | free(header); | |
1667 | return status; | |
1668 | } | |
1669 | ||
bbac7311 NP |
1670 | int force_object_loose(const unsigned char *sha1, time_t mtime) |
1671 | { | |
bbac7311 NP |
1672 | void *buf; |
1673 | unsigned long len; | |
1674 | enum object_type type; | |
1675 | char hdr[32]; | |
1676 | int hdrlen; | |
1fb23e65 | 1677 | int ret; |
bbac7311 | 1678 | |
c529d75a | 1679 | if (has_loose_object(sha1)) |
bbac7311 | 1680 | return 0; |
789bf26b | 1681 | buf = read_object(sha1, &type, &len); |
bbac7311 NP |
1682 | if (!buf) |
1683 | return error("cannot read sha1_file for %s", sha1_to_hex(sha1)); | |
ef1286d3 | 1684 | hdrlen = xsnprintf(hdr, sizeof(hdr), "%s %lu", typename(type), len) + 1; |
1fb23e65 BS |
1685 | ret = write_loose_object(sha1, hdr, hdrlen, buf, len, mtime); |
1686 | free(buf); | |
1687 | ||
1688 | return ret; | |
bbac7311 NP |
1689 | } |
1690 | ||
0eeb077b | 1691 | int has_sha1_file_with_flags(const unsigned char *sha1, int flags) |
8237b185 | 1692 | { |
3e8b7d3c JN |
1693 | if (!startup_info->have_repository) |
1694 | return 0; | |
e83e71c5 JT |
1695 | return sha1_object_info_extended(sha1, NULL, |
1696 | flags | OBJECT_INFO_SKIP_CACHED) >= 0; | |
b419aa25 | 1697 | } |
1698 | ||
1699 | int has_object_file(const struct object_id *oid) | |
1700 | { | |
1701 | return has_sha1_file(oid->hash); | |
8237b185 | 1702 | } |
74400e71 | 1703 | |
5827a035 JK |
1704 | int has_object_file_with_flags(const struct object_id *oid, int flags) |
1705 | { | |
1706 | return has_sha1_file_with_flags(oid->hash, flags); | |
1707 | } | |
1708 | ||
c879daa2 NTND |
1709 | static void check_tree(const void *buf, size_t size) |
1710 | { | |
1711 | struct tree_desc desc; | |
1712 | struct name_entry entry; | |
1713 | ||
1714 | init_tree_desc(&desc, buf, size); | |
1715 | while (tree_entry(&desc, &entry)) | |
1716 | /* do nothing | |
1717 | * tree_entry() will die() on malformed entries */ | |
1718 | ; | |
1719 | } | |
1720 | ||
1721 | static void check_commit(const void *buf, size_t size) | |
1722 | { | |
1723 | struct commit c; | |
1724 | memset(&c, 0, sizeof(c)); | |
1725 | if (parse_commit_buffer(&c, buf, size)) | |
1726 | die("corrupt commit"); | |
1727 | } | |
1728 | ||
1729 | static void check_tag(const void *buf, size_t size) | |
1730 | { | |
1731 | struct tag t; | |
1732 | memset(&t, 0, sizeof(t)); | |
1733 | if (parse_tag_buffer(&t, buf, size)) | |
1734 | die("corrupt tag"); | |
1735 | } | |
1736 | ||
bcd29864 | 1737 | static int index_mem(struct object_id *oid, void *buf, size_t size, |
c4ce46fc JH |
1738 | enum object_type type, |
1739 | const char *path, unsigned flags) | |
e7332f96 | 1740 | { |
6c510bee | 1741 | int ret, re_allocated = 0; |
c4ce46fc | 1742 | int write_object = flags & HASH_WRITE_OBJECT; |
74400e71 | 1743 | |
7672db20 | 1744 | if (!type) |
edaec3fb | 1745 | type = OBJ_BLOB; |
6c510bee LT |
1746 | |
1747 | /* | |
1748 | * Convert blobs to git internal format | |
1749 | */ | |
43df4f86 | 1750 | if ((type == OBJ_BLOB) && path) { |
f285a2d7 | 1751 | struct strbuf nbuf = STRBUF_INIT; |
82b474e0 | 1752 | if (convert_to_git(&the_index, path, buf, size, &nbuf, |
9472935d | 1753 | get_safe_crlf(flags))) { |
b315c5c0 | 1754 | buf = strbuf_detach(&nbuf, &size); |
6c510bee LT |
1755 | re_allocated = 1; |
1756 | } | |
1757 | } | |
c4ce46fc | 1758 | if (flags & HASH_FORMAT_CHECK) { |
c879daa2 NTND |
1759 | if (type == OBJ_TREE) |
1760 | check_tree(buf, size); | |
1761 | if (type == OBJ_COMMIT) | |
1762 | check_commit(buf, size); | |
1763 | if (type == OBJ_TAG) | |
1764 | check_tag(buf, size); | |
1765 | } | |
6c510bee | 1766 | |
7672db20 | 1767 | if (write_object) |
bcd29864 | 1768 | ret = write_sha1_file(buf, size, typename(type), oid->hash); |
abdc3fc8 | 1769 | else |
bcd29864 | 1770 | ret = hash_sha1_file(buf, size, typename(type), oid->hash); |
43df4f86 | 1771 | if (re_allocated) |
6c510bee | 1772 | free(buf); |
43df4f86 DP |
1773 | return ret; |
1774 | } | |
1775 | ||
bcd29864 | 1776 | static int index_stream_convert_blob(struct object_id *oid, int fd, |
9035d75a SP |
1777 | const char *path, unsigned flags) |
1778 | { | |
1779 | int ret; | |
1780 | const int write_object = flags & HASH_WRITE_OBJECT; | |
1781 | struct strbuf sbuf = STRBUF_INIT; | |
1782 | ||
1783 | assert(path); | |
1784 | assert(would_convert_to_git_filter_fd(path)); | |
1785 | ||
d6c41c20 | 1786 | convert_to_git_filter_fd(&the_index, path, fd, &sbuf, |
9472935d | 1787 | get_safe_crlf(flags)); |
9035d75a SP |
1788 | |
1789 | if (write_object) | |
1790 | ret = write_sha1_file(sbuf.buf, sbuf.len, typename(OBJ_BLOB), | |
bcd29864 | 1791 | oid->hash); |
9035d75a SP |
1792 | else |
1793 | ret = hash_sha1_file(sbuf.buf, sbuf.len, typename(OBJ_BLOB), | |
bcd29864 | 1794 | oid->hash); |
9035d75a SP |
1795 | strbuf_release(&sbuf); |
1796 | return ret; | |
1797 | } | |
1798 | ||
bcd29864 | 1799 | static int index_pipe(struct object_id *oid, int fd, enum object_type type, |
7b41e1e1 JH |
1800 | const char *path, unsigned flags) |
1801 | { | |
1802 | struct strbuf sbuf = STRBUF_INIT; | |
1803 | int ret; | |
1804 | ||
1805 | if (strbuf_read(&sbuf, fd, 4096) >= 0) | |
bcd29864 | 1806 | ret = index_mem(oid, sbuf.buf, sbuf.len, type, path, flags); |
7b41e1e1 JH |
1807 | else |
1808 | ret = -1; | |
1809 | strbuf_release(&sbuf); | |
1810 | return ret; | |
1811 | } | |
1812 | ||
ea68b0ce DP |
1813 | #define SMALL_FILE_SIZE (32*1024) |
1814 | ||
bcd29864 | 1815 | static int index_core(struct object_id *oid, int fd, size_t size, |
7b41e1e1 JH |
1816 | enum object_type type, const char *path, |
1817 | unsigned flags) | |
43df4f86 DP |
1818 | { |
1819 | int ret; | |
43df4f86 | 1820 | |
7b41e1e1 | 1821 | if (!size) { |
bcd29864 | 1822 | ret = index_mem(oid, "", size, type, path, flags); |
ea68b0ce DP |
1823 | } else if (size <= SMALL_FILE_SIZE) { |
1824 | char *buf = xmalloc(size); | |
90dca671 JK |
1825 | ssize_t read_result = read_in_full(fd, buf, size); |
1826 | if (read_result < 0) | |
1827 | ret = error_errno("read error while indexing %s", | |
1828 | path ? path : "<unknown>"); | |
1829 | else if (read_result != size) | |
1830 | ret = error("short read while indexing %s", | |
1831 | path ? path : "<unknown>"); | |
ea68b0ce | 1832 | else |
bcd29864 | 1833 | ret = index_mem(oid, buf, size, type, path, flags); |
ea68b0ce | 1834 | free(buf); |
08bda208 | 1835 | } else { |
43df4f86 | 1836 | void *buf = xmmap(NULL, size, PROT_READ, MAP_PRIVATE, fd, 0); |
bcd29864 | 1837 | ret = index_mem(oid, buf, size, type, path, flags); |
aac17941 | 1838 | munmap(buf, size); |
08bda208 | 1839 | } |
7b41e1e1 JH |
1840 | return ret; |
1841 | } | |
1842 | ||
4dd1fbc7 | 1843 | /* |
568508e7 JH |
1844 | * This creates one packfile per large blob unless bulk-checkin |
1845 | * machinery is "plugged". | |
4dd1fbc7 JH |
1846 | * |
1847 | * This also bypasses the usual "convert-to-git" dance, and that is on | |
1848 | * purpose. We could write a streaming version of the converting | |
1849 | * functions and insert that before feeding the data to fast-import | |
4f22b101 JK |
1850 | * (or equivalent in-core API described above). However, that is |
1851 | * somewhat complicated, as we do not know the size of the filter | |
1852 | * result, which we need to know beforehand when writing a git object. | |
1853 | * Since the primary motivation for trying to stream from the working | |
1854 | * tree file and to avoid mmaping it in core is to deal with large | |
1855 | * binary blobs, they generally do not want to get any conversion, and | |
1856 | * callers should avoid this code path when filters are requested. | |
4dd1fbc7 | 1857 | */ |
7d5e1dc3 | 1858 | static int index_stream(struct object_id *oid, int fd, size_t size, |
4dd1fbc7 JH |
1859 | enum object_type type, const char *path, |
1860 | unsigned flags) | |
1861 | { | |
7d5e1dc3 | 1862 | return index_bulk_checkin(oid->hash, fd, size, type, path, flags); |
4dd1fbc7 JH |
1863 | } |
1864 | ||
e3506559 | 1865 | int index_fd(struct object_id *oid, int fd, struct stat *st, |
7b41e1e1 JH |
1866 | enum object_type type, const char *path, unsigned flags) |
1867 | { | |
1868 | int ret; | |
7b41e1e1 | 1869 | |
9079ab7c SP |
1870 | /* |
1871 | * Call xsize_t() only when needed to avoid potentially unnecessary | |
1872 | * die() for large files. | |
1873 | */ | |
9035d75a | 1874 | if (type == OBJ_BLOB && path && would_convert_to_git_filter_fd(path)) |
bcd29864 | 1875 | ret = index_stream_convert_blob(oid, fd, path, flags); |
9035d75a | 1876 | else if (!S_ISREG(st->st_mode)) |
bcd29864 | 1877 | ret = index_pipe(oid, fd, type, path, flags); |
9079ab7c | 1878 | else if (st->st_size <= big_file_threshold || type != OBJ_BLOB || |
82b474e0 | 1879 | (path && would_convert_to_git(&the_index, path))) |
bcd29864 | 1880 | ret = index_core(oid, fd, xsize_t(st->st_size), type, path, |
9079ab7c | 1881 | flags); |
4dd1fbc7 | 1882 | else |
7d5e1dc3 | 1883 | ret = index_stream(oid, fd, xsize_t(st->st_size), type, path, |
9079ab7c | 1884 | flags); |
43df4f86 | 1885 | close(fd); |
aac17941 | 1886 | return ret; |
74400e71 | 1887 | } |
ec1fcc16 | 1888 | |
98e019b0 | 1889 | int index_path(struct object_id *oid, const char *path, struct stat *st, unsigned flags) |
ec1fcc16 JH |
1890 | { |
1891 | int fd; | |
b760d3aa | 1892 | struct strbuf sb = STRBUF_INIT; |
ea8e0297 | 1893 | int rc = 0; |
ec1fcc16 JH |
1894 | |
1895 | switch (st->st_mode & S_IFMT) { | |
1896 | case S_IFREG: | |
1897 | fd = open(path, O_RDONLY); | |
1898 | if (fd < 0) | |
7616c6ca | 1899 | return error_errno("open(\"%s\")", path); |
e3506559 | 1900 | if (index_fd(oid, fd, st, OBJ_BLOB, path, flags) < 0) |
ec1fcc16 JH |
1901 | return error("%s: failed to insert into database", |
1902 | path); | |
1903 | break; | |
1904 | case S_IFLNK: | |
7616c6ca NTND |
1905 | if (strbuf_readlink(&sb, path, st->st_size)) |
1906 | return error_errno("readlink(\"%s\")", path); | |
c4ce46fc | 1907 | if (!(flags & HASH_WRITE_OBJECT)) |
98e019b0 PO |
1908 | hash_sha1_file(sb.buf, sb.len, blob_type, oid->hash); |
1909 | else if (write_sha1_file(sb.buf, sb.len, blob_type, oid->hash)) | |
ea8e0297 | 1910 | rc = error("%s: failed to insert into database", path); |
b760d3aa | 1911 | strbuf_release(&sb); |
ec1fcc16 | 1912 | break; |
f35a6d3b | 1913 | case S_IFDIR: |
a98e6101 | 1914 | return resolve_gitlink_ref(path, "HEAD", oid); |
ec1fcc16 JH |
1915 | default: |
1916 | return error("%s: unsupported file type", path); | |
1917 | } | |
ea8e0297 | 1918 | return rc; |
ec1fcc16 | 1919 | } |
a69e5429 JH |
1920 | |
1921 | int read_pack_header(int fd, struct pack_header *header) | |
1922 | { | |
f48ecd38 | 1923 | if (read_in_full(fd, header, sizeof(*header)) != sizeof(*header)) |
c697ad14 HO |
1924 | /* "eof before pack header was fully read" */ |
1925 | return PH_ERROR_EOF; | |
1926 | ||
a69e5429 JH |
1927 | if (header->hdr_signature != htonl(PACK_SIGNATURE)) |
1928 | /* "protocol error (pack signature mismatch detected)" */ | |
1929 | return PH_ERROR_PACK_SIGNATURE; | |
1930 | if (!pack_version_ok(header->hdr_version)) | |
1931 | /* "protocol error (pack version unsupported)" */ | |
1932 | return PH_ERROR_PROTOCOL; | |
1933 | return 0; | |
1934 | } | |
40d52ff7 JK |
1935 | |
1936 | void assert_sha1_type(const unsigned char *sha1, enum object_type expect) | |
1937 | { | |
1938 | enum object_type type = sha1_object_info(sha1, NULL); | |
1939 | if (type < 0) | |
1940 | die("%s is not a valid object", sha1_to_hex(sha1)); | |
1941 | if (type != expect) | |
1942 | die("%s is not a valid '%s' object", sha1_to_hex(sha1), | |
1943 | typename(expect)); | |
1944 | } | |
27e1e22d | 1945 | |
70c49050 | 1946 | int for_each_file_in_obj_subdir(unsigned int subdir_nr, |
cc817ca3 RS |
1947 | struct strbuf *path, |
1948 | each_loose_object_fn obj_cb, | |
1949 | each_loose_cruft_fn cruft_cb, | |
1950 | each_loose_subdir_fn subdir_cb, | |
1951 | void *data) | |
27e1e22d | 1952 | { |
0375f472 RS |
1953 | size_t origlen, baselen; |
1954 | DIR *dir; | |
27e1e22d JK |
1955 | struct dirent *de; |
1956 | int r = 0; | |
62a24c89 | 1957 | struct object_id oid; |
27e1e22d | 1958 | |
70c49050 RS |
1959 | if (subdir_nr > 0xff) |
1960 | BUG("invalid loose object subdirectory: %x", subdir_nr); | |
1961 | ||
0375f472 RS |
1962 | origlen = path->len; |
1963 | strbuf_complete(path, '/'); | |
1964 | strbuf_addf(path, "%02x", subdir_nr); | |
0375f472 RS |
1965 | |
1966 | dir = opendir(path->buf); | |
27e1e22d | 1967 | if (!dir) { |
0375f472 RS |
1968 | if (errno != ENOENT) |
1969 | r = error_errno("unable to open %s", path->buf); | |
1970 | strbuf_setlen(path, origlen); | |
1971 | return r; | |
27e1e22d JK |
1972 | } |
1973 | ||
62a24c89 | 1974 | oid.hash[0] = subdir_nr; |
163ee5e6 DS |
1975 | strbuf_addch(path, '/'); |
1976 | baselen = path->len; | |
62a24c89 | 1977 | |
27e1e22d | 1978 | while ((de = readdir(dir))) { |
163ee5e6 | 1979 | size_t namelen; |
27e1e22d JK |
1980 | if (is_dot_or_dotdot(de->d_name)) |
1981 | continue; | |
1982 | ||
163ee5e6 | 1983 | namelen = strlen(de->d_name); |
27e1e22d | 1984 | strbuf_setlen(path, baselen); |
163ee5e6 DS |
1985 | strbuf_add(path, de->d_name, namelen); |
1986 | if (namelen == GIT_SHA1_HEXSZ - 2 && | |
62a24c89 RS |
1987 | !hex_to_bytes(oid.hash + 1, de->d_name, |
1988 | GIT_SHA1_RAWSZ - 1)) { | |
1989 | if (obj_cb) { | |
1990 | r = obj_cb(&oid, path->buf, data); | |
1991 | if (r) | |
1992 | break; | |
27e1e22d | 1993 | } |
62a24c89 | 1994 | continue; |
27e1e22d JK |
1995 | } |
1996 | ||
1997 | if (cruft_cb) { | |
1998 | r = cruft_cb(de->d_name, path->buf, data); | |
1999 | if (r) | |
2000 | break; | |
2001 | } | |
2002 | } | |
094c7e63 | 2003 | closedir(dir); |
27e1e22d | 2004 | |
163ee5e6 | 2005 | strbuf_setlen(path, baselen - 1); |
27e1e22d JK |
2006 | if (!r && subdir_cb) |
2007 | r = subdir_cb(subdir_nr, path->buf, data); | |
2008 | ||
0375f472 RS |
2009 | strbuf_setlen(path, origlen); |
2010 | ||
27e1e22d JK |
2011 | return r; |
2012 | } | |
2013 | ||
e6f875e0 | 2014 | int for_each_loose_file_in_objdir_buf(struct strbuf *path, |
27e1e22d JK |
2015 | each_loose_object_fn obj_cb, |
2016 | each_loose_cruft_fn cruft_cb, | |
2017 | each_loose_subdir_fn subdir_cb, | |
2018 | void *data) | |
2019 | { | |
27e1e22d JK |
2020 | int r = 0; |
2021 | int i; | |
2022 | ||
27e1e22d | 2023 | for (i = 0; i < 256; i++) { |
e6f875e0 | 2024 | r = for_each_file_in_obj_subdir(i, path, obj_cb, cruft_cb, |
27e1e22d | 2025 | subdir_cb, data); |
27e1e22d JK |
2026 | if (r) |
2027 | break; | |
2028 | } | |
2029 | ||
e6f875e0 JK |
2030 | return r; |
2031 | } | |
2032 | ||
2033 | int for_each_loose_file_in_objdir(const char *path, | |
2034 | each_loose_object_fn obj_cb, | |
2035 | each_loose_cruft_fn cruft_cb, | |
2036 | each_loose_subdir_fn subdir_cb, | |
2037 | void *data) | |
2038 | { | |
2039 | struct strbuf buf = STRBUF_INIT; | |
2040 | int r; | |
2041 | ||
2042 | strbuf_addstr(&buf, path); | |
2043 | r = for_each_loose_file_in_objdir_buf(&buf, obj_cb, cruft_cb, | |
2044 | subdir_cb, data); | |
27e1e22d | 2045 | strbuf_release(&buf); |
e6f875e0 | 2046 | |
27e1e22d JK |
2047 | return r; |
2048 | } | |
660c889e JK |
2049 | |
2050 | struct loose_alt_odb_data { | |
2051 | each_loose_object_fn *cb; | |
2052 | void *data; | |
2053 | }; | |
2054 | ||
2055 | static int loose_from_alt_odb(struct alternate_object_database *alt, | |
2056 | void *vdata) | |
2057 | { | |
2058 | struct loose_alt_odb_data *data = vdata; | |
b0a42642 JM |
2059 | struct strbuf buf = STRBUF_INIT; |
2060 | int r; | |
2061 | ||
597f9134 | 2062 | strbuf_addstr(&buf, alt->path); |
b0a42642 JM |
2063 | r = for_each_loose_file_in_objdir_buf(&buf, |
2064 | data->cb, NULL, NULL, | |
2065 | data->data); | |
2066 | strbuf_release(&buf); | |
2067 | return r; | |
660c889e JK |
2068 | } |
2069 | ||
1385bb7b | 2070 | int for_each_loose_object(each_loose_object_fn cb, void *data, unsigned flags) |
660c889e JK |
2071 | { |
2072 | struct loose_alt_odb_data alt; | |
2073 | int r; | |
2074 | ||
2075 | r = for_each_loose_file_in_objdir(get_object_directory(), | |
2076 | cb, NULL, NULL, data); | |
2077 | if (r) | |
2078 | return r; | |
2079 | ||
1385bb7b JK |
2080 | if (flags & FOR_EACH_OBJECT_LOCAL_ONLY) |
2081 | return 0; | |
2082 | ||
660c889e JK |
2083 | alt.cb = cb; |
2084 | alt.data = data; | |
2085 | return foreach_alt_odb(loose_from_alt_odb, &alt); | |
2086 | } | |
2087 | ||
f6371f92 JK |
2088 | static int check_stream_sha1(git_zstream *stream, |
2089 | const char *hdr, | |
2090 | unsigned long size, | |
2091 | const char *path, | |
2092 | const unsigned char *expected_sha1) | |
2093 | { | |
18e2588e | 2094 | git_hash_ctx c; |
cd02599c | 2095 | unsigned char real_sha1[GIT_MAX_RAWSZ]; |
f6371f92 JK |
2096 | unsigned char buf[4096]; |
2097 | unsigned long total_read; | |
2098 | int status = Z_OK; | |
2099 | ||
18e2588e | 2100 | the_hash_algo->init_fn(&c); |
2101 | the_hash_algo->update_fn(&c, hdr, stream->total_out); | |
f6371f92 JK |
2102 | |
2103 | /* | |
2104 | * We already read some bytes into hdr, but the ones up to the NUL | |
2105 | * do not count against the object's content size. | |
2106 | */ | |
2107 | total_read = stream->total_out - strlen(hdr) - 1; | |
2108 | ||
2109 | /* | |
2110 | * This size comparison must be "<=" to read the final zlib packets; | |
2111 | * see the comment in unpack_sha1_rest for details. | |
2112 | */ | |
2113 | while (total_read <= size && | |
2114 | (status == Z_OK || status == Z_BUF_ERROR)) { | |
2115 | stream->next_out = buf; | |
2116 | stream->avail_out = sizeof(buf); | |
2117 | if (size - total_read < stream->avail_out) | |
2118 | stream->avail_out = size - total_read; | |
2119 | status = git_inflate(stream, Z_FINISH); | |
18e2588e | 2120 | the_hash_algo->update_fn(&c, buf, stream->next_out - buf); |
f6371f92 JK |
2121 | total_read += stream->next_out - buf; |
2122 | } | |
2123 | git_inflate_end(stream); | |
2124 | ||
2125 | if (status != Z_STREAM_END) { | |
2126 | error("corrupt loose object '%s'", sha1_to_hex(expected_sha1)); | |
2127 | return -1; | |
2128 | } | |
cce044df JK |
2129 | if (stream->avail_in) { |
2130 | error("garbage at end of loose object '%s'", | |
2131 | sha1_to_hex(expected_sha1)); | |
2132 | return -1; | |
2133 | } | |
f6371f92 | 2134 | |
18e2588e | 2135 | the_hash_algo->final_fn(real_sha1, &c); |
f6371f92 JK |
2136 | if (hashcmp(expected_sha1, real_sha1)) { |
2137 | error("sha1 mismatch for %s (expected %s)", path, | |
2138 | sha1_to_hex(expected_sha1)); | |
2139 | return -1; | |
2140 | } | |
2141 | ||
2142 | return 0; | |
2143 | } | |
2144 | ||
2145 | int read_loose_object(const char *path, | |
2146 | const unsigned char *expected_sha1, | |
2147 | enum object_type *type, | |
2148 | unsigned long *size, | |
2149 | void **contents) | |
2150 | { | |
2151 | int ret = -1; | |
f6371f92 JK |
2152 | void *map = NULL; |
2153 | unsigned long mapsize; | |
2154 | git_zstream stream; | |
2155 | char hdr[32]; | |
2156 | ||
2157 | *contents = NULL; | |
2158 | ||
2159 | map = map_sha1_file_1(path, NULL, &mapsize); | |
2160 | if (!map) { | |
2161 | error_errno("unable to mmap %s", path); | |
2162 | goto out; | |
2163 | } | |
2164 | ||
2165 | if (unpack_sha1_header(&stream, map, mapsize, hdr, sizeof(hdr)) < 0) { | |
2166 | error("unable to unpack header of %s", path); | |
2167 | goto out; | |
2168 | } | |
2169 | ||
2170 | *type = parse_sha1_header(hdr, size); | |
2171 | if (*type < 0) { | |
2172 | error("unable to parse header of %s", path); | |
2173 | git_inflate_end(&stream); | |
2174 | goto out; | |
2175 | } | |
2176 | ||
2177 | if (*type == OBJ_BLOB) { | |
2178 | if (check_stream_sha1(&stream, hdr, *size, path, expected_sha1) < 0) | |
2179 | goto out; | |
2180 | } else { | |
2181 | *contents = unpack_sha1_rest(&stream, hdr, *size, expected_sha1); | |
2182 | if (!*contents) { | |
2183 | error("unable to unpack contents of %s", path); | |
2184 | git_inflate_end(&stream); | |
2185 | goto out; | |
2186 | } | |
2187 | if (check_sha1_signature(expected_sha1, *contents, | |
2188 | *size, typename(*type))) { | |
2189 | error("sha1 mismatch for %s (expected %s)", path, | |
2190 | sha1_to_hex(expected_sha1)); | |
2191 | free(*contents); | |
2192 | goto out; | |
2193 | } | |
2194 | } | |
2195 | ||
2196 | ret = 0; /* everything checks out */ | |
2197 | ||
2198 | out: | |
2199 | if (map) | |
2200 | munmap(map, mapsize); | |
f6371f92 JK |
2201 | return ret; |
2202 | } |