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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" |
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" |
12d95ef6 | 27 | #include "list.h" |
c4c6effa | 28 | #include "mergesort.h" |
cf3c6352 | 29 | #include "quote.h" |
4f39cd82 | 30 | #include "packfile.h" |
8b4c0103 | 31 | #include "fetch-object.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 | |
f50e766b | 42 | static void git_hash_sha1_init(void *ctx) |
43 | { | |
44 | git_SHA1_Init((git_SHA_CTX *)ctx); | |
45 | } | |
46 | ||
47 | static void git_hash_sha1_update(void *ctx, const void *data, size_t len) | |
48 | { | |
49 | git_SHA1_Update((git_SHA_CTX *)ctx, data, len); | |
50 | } | |
51 | ||
52 | static void git_hash_sha1_final(unsigned char *hash, void *ctx) | |
53 | { | |
54 | git_SHA1_Final(hash, (git_SHA_CTX *)ctx); | |
55 | } | |
56 | ||
57 | static void git_hash_unknown_init(void *ctx) | |
58 | { | |
59 | die("trying to init unknown hash"); | |
60 | } | |
61 | ||
62 | static void git_hash_unknown_update(void *ctx, const void *data, size_t len) | |
63 | { | |
64 | die("trying to update unknown hash"); | |
65 | } | |
66 | ||
67 | static void git_hash_unknown_final(unsigned char *hash, void *ctx) | |
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, | |
78 | 0, | |
79 | git_hash_unknown_init, | |
80 | git_hash_unknown_update, | |
81 | git_hash_unknown_final, | |
82 | NULL, | |
83 | NULL, | |
84 | }, | |
85 | { | |
86 | "sha-1", | |
87 | /* "sha1", big-endian */ | |
88 | 0x73686131, | |
89 | sizeof(git_SHA_CTX), | |
90 | GIT_SHA1_RAWSZ, | |
91 | GIT_SHA1_HEXSZ, | |
92 | git_hash_sha1_init, | |
93 | git_hash_sha1_update, | |
94 | git_hash_sha1_final, | |
95 | &empty_tree_oid, | |
96 | &empty_blob_oid, | |
97 | }, | |
98 | }; | |
99 | ||
c597ba80 NTND |
100 | /* |
101 | * This is meant to hold a *small* number of objects that you would | |
102 | * want read_sha1_file() to be able to return, but yet you do not want | |
103 | * to write them into the object store (e.g. a browse-only | |
104 | * application). | |
105 | */ | |
106 | static struct cached_object { | |
107 | unsigned char sha1[20]; | |
108 | enum object_type type; | |
109 | void *buf; | |
110 | unsigned long size; | |
111 | } *cached_objects; | |
112 | static int cached_object_nr, cached_object_alloc; | |
113 | ||
114 | static struct cached_object empty_tree = { | |
dab0d410 | 115 | EMPTY_TREE_SHA1_BIN_LITERAL, |
c597ba80 NTND |
116 | OBJ_TREE, |
117 | "", | |
118 | 0 | |
119 | }; | |
120 | ||
121 | static struct cached_object *find_cached_object(const unsigned char *sha1) | |
122 | { | |
123 | int i; | |
124 | struct cached_object *co = cached_objects; | |
125 | ||
126 | for (i = 0; i < cached_object_nr; i++, co++) { | |
127 | if (!hashcmp(co->sha1, sha1)) | |
128 | return co; | |
129 | } | |
130 | if (!hashcmp(sha1, empty_tree.sha1)) | |
131 | return &empty_tree; | |
132 | return NULL; | |
133 | } | |
134 | ||
9472935d | 135 | |
8462ff43 | 136 | static int get_conv_flags(unsigned flags) |
9472935d TB |
137 | { |
138 | if (flags & HASH_RENORMALIZE) | |
8462ff43 | 139 | return CONV_EOL_RENORMALIZE; |
9472935d | 140 | else if (flags & HASH_WRITE_OBJECT) |
8462ff43 | 141 | return global_conv_flags_eol; |
9472935d | 142 | else |
8462ff43 | 143 | return 0; |
9472935d TB |
144 | } |
145 | ||
146 | ||
90a6464b JH |
147 | int mkdir_in_gitdir(const char *path) |
148 | { | |
149 | if (mkdir(path, 0777)) { | |
150 | int saved_errno = errno; | |
151 | struct stat st; | |
152 | struct strbuf sb = STRBUF_INIT; | |
153 | ||
154 | if (errno != EEXIST) | |
155 | return -1; | |
156 | /* | |
157 | * Are we looking at a path in a symlinked worktree | |
158 | * whose original repository does not yet have it? | |
159 | * e.g. .git/rr-cache pointing at its original | |
160 | * repository in which the user hasn't performed any | |
161 | * conflict resolution yet? | |
162 | */ | |
163 | if (lstat(path, &st) || !S_ISLNK(st.st_mode) || | |
164 | strbuf_readlink(&sb, path, st.st_size) || | |
165 | !is_absolute_path(sb.buf) || | |
166 | mkdir(sb.buf, 0777)) { | |
167 | strbuf_release(&sb); | |
168 | errno = saved_errno; | |
169 | return -1; | |
170 | } | |
171 | strbuf_release(&sb); | |
172 | } | |
173 | return adjust_shared_perm(path); | |
174 | } | |
175 | ||
0be0521b | 176 | enum scld_error safe_create_leading_directories(char *path) |
b2cb9425 | 177 | { |
26c8ae2a | 178 | char *next_component = path + offset_1st_component(path); |
0be0521b | 179 | enum scld_error ret = SCLD_OK; |
67d42212 | 180 | |
0be0521b | 181 | while (ret == SCLD_OK && next_component) { |
f0502332 | 182 | struct stat st; |
0f527403 | 183 | char *slash = next_component, slash_character; |
f0502332 | 184 | |
0f527403 MH |
185 | while (*slash && !is_dir_sep(*slash)) |
186 | slash++; | |
187 | ||
188 | if (!*slash) | |
b2cb9425 | 189 | break; |
bf10cf70 | 190 | |
26c8ae2a | 191 | next_component = slash + 1; |
0f527403 | 192 | while (is_dir_sep(*next_component)) |
bf10cf70 | 193 | next_component++; |
26c8ae2a | 194 | if (!*next_component) |
5f0bdf50 | 195 | break; |
831651fd | 196 | |
0f527403 | 197 | slash_character = *slash; |
831651fd | 198 | *slash = '\0'; |
67d42212 JR |
199 | if (!stat(path, &st)) { |
200 | /* path exists */ | |
204a047f MH |
201 | if (!S_ISDIR(st.st_mode)) { |
202 | errno = ENOTDIR; | |
0be0521b | 203 | ret = SCLD_EXISTS; |
204a047f | 204 | } |
53a39721 | 205 | } else if (mkdir(path, 0777)) { |
928734d9 | 206 | if (errno == EEXIST && |
9e6f885d | 207 | !stat(path, &st) && S_ISDIR(st.st_mode)) |
928734d9 | 208 | ; /* somebody created it since we checked */ |
18d37e86 MH |
209 | else if (errno == ENOENT) |
210 | /* | |
211 | * Either mkdir() failed because | |
212 | * somebody just pruned the containing | |
213 | * directory, or stat() failed because | |
214 | * the file that was in our way was | |
215 | * just removed. Either way, inform | |
216 | * the caller that it might be worth | |
217 | * trying again: | |
218 | */ | |
219 | ret = SCLD_VANISHED; | |
9e6f885d | 220 | else |
0be0521b | 221 | ret = SCLD_FAILED; |
53a39721 | 222 | } else if (adjust_shared_perm(path)) { |
0be0521b | 223 | ret = SCLD_PERMS; |
457f06d6 | 224 | } |
0f527403 | 225 | *slash = slash_character; |
b2cb9425 | 226 | } |
9e6f885d | 227 | return ret; |
b2cb9425 | 228 | } |
723c31fe | 229 | |
0be0521b | 230 | enum scld_error safe_create_leading_directories_const(const char *path) |
8e21d63b | 231 | { |
02944307 | 232 | int save_errno; |
8e21d63b JK |
233 | /* path points to cache entries, so xstrdup before messing with it */ |
234 | char *buf = xstrdup(path); | |
0be0521b | 235 | enum scld_error result = safe_create_leading_directories(buf); |
02944307 MH |
236 | |
237 | save_errno = errno; | |
8e21d63b | 238 | free(buf); |
02944307 | 239 | errno = save_errno; |
8e21d63b JK |
240 | return result; |
241 | } | |
242 | ||
177978f5 MH |
243 | int raceproof_create_file(const char *path, create_file_fn fn, void *cb) |
244 | { | |
245 | /* | |
246 | * The number of times we will try to remove empty directories | |
247 | * in the way of path. This is only 1 because if another | |
248 | * process is racily creating directories that conflict with | |
249 | * us, we don't want to fight against them. | |
250 | */ | |
251 | int remove_directories_remaining = 1; | |
252 | ||
253 | /* | |
254 | * The number of times that we will try to create the | |
255 | * directories containing path. We are willing to attempt this | |
256 | * more than once, because another process could be trying to | |
257 | * clean up empty directories at the same time as we are | |
258 | * trying to create them. | |
259 | */ | |
260 | int create_directories_remaining = 3; | |
261 | ||
262 | /* A scratch copy of path, filled lazily if we need it: */ | |
263 | struct strbuf path_copy = STRBUF_INIT; | |
264 | ||
265 | int ret, save_errno; | |
266 | ||
267 | /* Sanity check: */ | |
268 | assert(*path); | |
269 | ||
270 | retry_fn: | |
271 | ret = fn(path, cb); | |
272 | save_errno = errno; | |
273 | if (!ret) | |
274 | goto out; | |
275 | ||
276 | if (errno == EISDIR && remove_directories_remaining-- > 0) { | |
277 | /* | |
278 | * A directory is in the way. Maybe it is empty; try | |
279 | * to remove it: | |
280 | */ | |
281 | if (!path_copy.len) | |
282 | strbuf_addstr(&path_copy, path); | |
283 | ||
284 | if (!remove_dir_recursively(&path_copy, REMOVE_DIR_EMPTY_ONLY)) | |
285 | goto retry_fn; | |
286 | } else if (errno == ENOENT && create_directories_remaining-- > 0) { | |
287 | /* | |
288 | * Maybe the containing directory didn't exist, or | |
289 | * maybe it was just deleted by a process that is | |
290 | * racing with us to clean up empty directories. Try | |
291 | * to create it: | |
292 | */ | |
293 | enum scld_error scld_result; | |
294 | ||
295 | if (!path_copy.len) | |
296 | strbuf_addstr(&path_copy, path); | |
297 | ||
298 | do { | |
299 | scld_result = safe_create_leading_directories(path_copy.buf); | |
300 | if (scld_result == SCLD_OK) | |
301 | goto retry_fn; | |
302 | } while (scld_result == SCLD_VANISHED && create_directories_remaining-- > 0); | |
303 | } | |
304 | ||
305 | out: | |
306 | strbuf_release(&path_copy); | |
307 | errno = save_errno; | |
308 | return ret; | |
309 | } | |
310 | ||
f7b7774f | 311 | static void fill_sha1_path(struct strbuf *buf, const unsigned char *sha1) |
ace1534d JH |
312 | { |
313 | int i; | |
314 | for (i = 0; i < 20; i++) { | |
315 | static char hex[] = "0123456789abcdef"; | |
316 | unsigned int val = sha1[i]; | |
f7b7774f JK |
317 | strbuf_addch(buf, hex[val >> 4]); |
318 | strbuf_addch(buf, hex[val & 0xf]); | |
afbba2f0 | 319 | if (!i) |
f7b7774f | 320 | strbuf_addch(buf, '/'); |
ace1534d JH |
321 | } |
322 | } | |
323 | ||
ea657730 | 324 | void sha1_file_name(struct strbuf *buf, const unsigned char *sha1) |
0fcfd160 | 325 | { |
34498471 CC |
326 | strbuf_addstr(buf, get_object_directory()); |
327 | strbuf_addch(buf, '/'); | |
ea657730 | 328 | fill_sha1_path(buf, sha1); |
0fcfd160 LT |
329 | } |
330 | ||
38dbe5f0 JK |
331 | struct strbuf *alt_scratch_buf(struct alternate_object_database *alt) |
332 | { | |
333 | strbuf_setlen(&alt->scratch, alt->base_len); | |
334 | return &alt->scratch; | |
335 | } | |
336 | ||
29ec6af2 JK |
337 | static const char *alt_sha1_path(struct alternate_object_database *alt, |
338 | const unsigned char *sha1) | |
339 | { | |
38dbe5f0 | 340 | struct strbuf *buf = alt_scratch_buf(alt); |
f7b7774f | 341 | fill_sha1_path(buf, sha1); |
38dbe5f0 | 342 | return buf->buf; |
0fcfd160 LT |
343 | } |
344 | ||
d5a63b99 JH |
345 | struct alternate_object_database *alt_odb_list; |
346 | static struct alternate_object_database **alt_odb_tail; | |
ace1534d | 347 | |
4ea82473 JK |
348 | /* |
349 | * Return non-zero iff the path is usable as an alternate object database. | |
350 | */ | |
351 | static int alt_odb_usable(struct strbuf *path, const char *normalized_objdir) | |
352 | { | |
353 | struct alternate_object_database *alt; | |
354 | ||
355 | /* Detect cases where alternate disappeared */ | |
356 | if (!is_directory(path->buf)) { | |
357 | error("object directory %s does not exist; " | |
358 | "check .git/objects/info/alternates.", | |
359 | path->buf); | |
360 | return 0; | |
361 | } | |
362 | ||
363 | /* | |
364 | * Prevent the common mistake of listing the same | |
365 | * thing twice, or object directory itself. | |
366 | */ | |
367 | for (alt = alt_odb_list; alt; alt = alt->next) { | |
ea0fc3b4 | 368 | if (!fspathcmp(path->buf, alt->path)) |
4ea82473 JK |
369 | return 0; |
370 | } | |
371 | if (!fspathcmp(path->buf, normalized_objdir)) | |
372 | return 0; | |
373 | ||
374 | return 1; | |
375 | } | |
376 | ||
ddd5d056 JH |
377 | /* |
378 | * Prepare alternate object database registry. | |
d5a63b99 JH |
379 | * |
380 | * The variable alt_odb_list points at the list of struct | |
381 | * alternate_object_database. The elements on this list come from | |
382 | * non-empty elements from colon separated ALTERNATE_DB_ENVIRONMENT | |
383 | * environment variable, and $GIT_OBJECT_DIRECTORY/info/alternates, | |
1494e038 JH |
384 | * whose contents is similar to that environment variable but can be |
385 | * LF separated. Its base points at a statically allocated buffer that | |
d5a63b99 JH |
386 | * contains "/the/directory/corresponding/to/.git/objects/...", while |
387 | * its name points just after the slash at the end of ".git/objects/" | |
388 | * in the example above, and has enough space to hold 40-byte hex | |
389 | * SHA1, an extra slash for the first level indirection, and the | |
390 | * terminating NUL. | |
ddd5d056 | 391 | */ |
2456990d | 392 | static void read_info_alternates(const char * relative_base, int depth); |
539e7506 EK |
393 | static int link_alt_odb_entry(const char *entry, const char *relative_base, |
394 | int depth, const char *normalized_objdir) | |
ace1534d | 395 | { |
c2f493a4 | 396 | struct alternate_object_database *ent; |
5bdf0a84 | 397 | struct strbuf pathbuf = STRBUF_INIT; |
d5a63b99 | 398 | |
85dadc38 | 399 | if (!is_absolute_path(entry) && relative_base) { |
4ac9006f | 400 | strbuf_realpath(&pathbuf, relative_base, 1); |
5bdf0a84 | 401 | strbuf_addch(&pathbuf, '/'); |
c2f493a4 | 402 | } |
6eac50d8 | 403 | strbuf_addstr(&pathbuf, entry); |
c2f493a4 | 404 | |
37a95862 | 405 | if (strbuf_normalize_path(&pathbuf) < 0 && relative_base) { |
670c359d JK |
406 | error("unable to normalize alternate object path: %s", |
407 | pathbuf.buf); | |
408 | strbuf_release(&pathbuf); | |
409 | return -1; | |
410 | } | |
5bdf0a84 HW |
411 | |
412 | /* | |
413 | * The trailing slash after the directory name is given by | |
414 | * this function at the end. Remove duplicates. | |
415 | */ | |
4ea82473 JK |
416 | while (pathbuf.len && pathbuf.buf[pathbuf.len - 1] == '/') |
417 | strbuf_setlen(&pathbuf, pathbuf.len - 1); | |
5bdf0a84 | 418 | |
4ea82473 JK |
419 | if (!alt_odb_usable(&pathbuf, normalized_objdir)) { |
420 | strbuf_release(&pathbuf); | |
c2f493a4 MW |
421 | return -1; |
422 | } | |
423 | ||
7f0fa2c0 | 424 | ent = alloc_alt_odb(pathbuf.buf); |
c2f493a4 MW |
425 | |
426 | /* add the alternate entry */ | |
427 | *alt_odb_tail = ent; | |
428 | alt_odb_tail = &(ent->next); | |
429 | ent->next = NULL; | |
430 | ||
431 | /* recursively add alternates */ | |
4ea82473 | 432 | read_info_alternates(pathbuf.buf, depth + 1); |
c2f493a4 | 433 | |
4ea82473 | 434 | strbuf_release(&pathbuf); |
c2f493a4 MW |
435 | return 0; |
436 | } | |
437 | ||
cf3c6352 JK |
438 | static const char *parse_alt_odb_entry(const char *string, |
439 | int sep, | |
440 | struct strbuf *out) | |
441 | { | |
442 | const char *end; | |
443 | ||
444 | strbuf_reset(out); | |
445 | ||
446 | if (*string == '#') { | |
447 | /* comment; consume up to next separator */ | |
448 | end = strchrnul(string, sep); | |
449 | } else if (*string == '"' && !unquote_c_style(out, string, &end)) { | |
450 | /* | |
451 | * quoted path; unquote_c_style has copied the | |
452 | * data for us and set "end". Broken quoting (e.g., | |
453 | * an entry that doesn't end with a quote) falls | |
454 | * back to the unquoted case below. | |
455 | */ | |
456 | } else { | |
457 | /* normal, unquoted path */ | |
458 | end = strchrnul(string, sep); | |
459 | strbuf_add(out, string, end - string); | |
460 | } | |
461 | ||
462 | if (*end) | |
463 | end++; | |
464 | return end; | |
465 | } | |
466 | ||
dc732bd5 | 467 | static void link_alt_odb_entries(const char *alt, int sep, |
c2f493a4 MW |
468 | const char *relative_base, int depth) |
469 | { | |
539e7506 | 470 | struct strbuf objdirbuf = STRBUF_INIT; |
cf3c6352 | 471 | struct strbuf entry = STRBUF_INIT; |
c2f493a4 | 472 | |
f28e3668 JK |
473 | if (!alt || !*alt) |
474 | return; | |
475 | ||
c2f493a4 MW |
476 | if (depth > 5) { |
477 | error("%s: ignoring alternate object stores, nesting too deep.", | |
478 | relative_base); | |
479 | return; | |
480 | } | |
481 | ||
f655651e | 482 | strbuf_add_absolute_path(&objdirbuf, get_object_directory()); |
670c359d JK |
483 | if (strbuf_normalize_path(&objdirbuf) < 0) |
484 | die("unable to normalize object directory: %s", | |
485 | objdirbuf.buf); | |
539e7506 | 486 | |
cf3c6352 JK |
487 | while (*alt) { |
488 | alt = parse_alt_odb_entry(alt, sep, &entry); | |
489 | if (!entry.len) | |
9577e7e3 | 490 | continue; |
cf3c6352 | 491 | link_alt_odb_entry(entry.buf, relative_base, depth, objdirbuf.buf); |
9577e7e3 | 492 | } |
cf3c6352 | 493 | strbuf_release(&entry); |
539e7506 | 494 | strbuf_release(&objdirbuf); |
d5a63b99 JH |
495 | } |
496 | ||
2456990d | 497 | static void read_info_alternates(const char * relative_base, int depth) |
d5a63b99 | 498 | { |
5015f01c | 499 | char *path; |
dc732bd5 | 500 | struct strbuf buf = STRBUF_INIT; |
d5a63b99 | 501 | |
5015f01c | 502 | path = xstrfmt("%s/info/alternates", relative_base); |
dc732bd5 | 503 | if (strbuf_read_file(&buf, path, 1024) < 0) { |
f0f7bebe | 504 | warn_on_fopen_errors(path); |
dc732bd5 | 505 | free(path); |
9a217f2a | 506 | return; |
ace1534d | 507 | } |
d5a63b99 | 508 | |
dc732bd5 JK |
509 | link_alt_odb_entries(buf.buf, '\n', relative_base, depth); |
510 | strbuf_release(&buf); | |
511 | free(path); | |
ace1534d JH |
512 | } |
513 | ||
7f0fa2c0 JK |
514 | struct alternate_object_database *alloc_alt_odb(const char *dir) |
515 | { | |
516 | struct alternate_object_database *ent; | |
7f0fa2c0 | 517 | |
597f9134 | 518 | FLEX_ALLOC_STR(ent, path, dir); |
38dbe5f0 JK |
519 | strbuf_init(&ent->scratch, 0); |
520 | strbuf_addf(&ent->scratch, "%s/", dir); | |
521 | ent->base_len = ent->scratch.len; | |
7f0fa2c0 JK |
522 | |
523 | return ent; | |
524 | } | |
525 | ||
bef70b22 DB |
526 | void add_to_alternates_file(const char *reference) |
527 | { | |
f132a127 | 528 | struct lock_file lock = LOCK_INIT; |
77b9b1d1 JK |
529 | char *alts = git_pathdup("objects/info/alternates"); |
530 | FILE *in, *out; | |
f132a127 | 531 | int found = 0; |
77b9b1d1 | 532 | |
f132a127 MÅ |
533 | hold_lock_file_for_update(&lock, alts, LOCK_DIE_ON_ERROR); |
534 | out = fdopen_lock_file(&lock, "w"); | |
77b9b1d1 JK |
535 | if (!out) |
536 | die_errno("unable to fdopen alternates lockfile"); | |
537 | ||
538 | in = fopen(alts, "r"); | |
539 | if (in) { | |
540 | struct strbuf line = STRBUF_INIT; | |
77b9b1d1 | 541 | |
3f163962 | 542 | while (strbuf_getline(&line, in) != EOF) { |
77b9b1d1 JK |
543 | if (!strcmp(reference, line.buf)) { |
544 | found = 1; | |
545 | break; | |
546 | } | |
547 | fprintf_or_die(out, "%s\n", line.buf); | |
548 | } | |
549 | ||
550 | strbuf_release(&line); | |
551 | fclose(in); | |
77b9b1d1 JK |
552 | } |
553 | else if (errno != ENOENT) | |
554 | die_errno("unable to read alternates file"); | |
555 | ||
f132a127 MÅ |
556 | if (found) { |
557 | rollback_lock_file(&lock); | |
558 | } else { | |
77b9b1d1 | 559 | fprintf_or_die(out, "%s\n", reference); |
f132a127 | 560 | if (commit_lock_file(&lock)) |
77b9b1d1 JK |
561 | die_errno("unable to move new alternates file into place"); |
562 | if (alt_odb_tail) | |
dc732bd5 | 563 | link_alt_odb_entries(reference, '\n', NULL, 0); |
77b9b1d1 JK |
564 | } |
565 | free(alts); | |
bef70b22 DB |
566 | } |
567 | ||
a5b34d21 JK |
568 | void add_to_alternates_memory(const char *reference) |
569 | { | |
570 | /* | |
571 | * Make sure alternates are initialized, or else our entry may be | |
572 | * overwritten when they are. | |
573 | */ | |
574 | prepare_alt_odb(); | |
575 | ||
dc732bd5 | 576 | link_alt_odb_entries(reference, '\n', NULL, 0); |
a5b34d21 JK |
577 | } |
578 | ||
9eeea7d2 SB |
579 | /* |
580 | * Compute the exact path an alternate is at and returns it. In case of | |
581 | * error NULL is returned and the human readable error is added to `err` | |
582 | * `path` may be relative and should point to $GITDIR. | |
583 | * `err` must not be null. | |
584 | */ | |
585 | char *compute_alternate_path(const char *path, struct strbuf *err) | |
586 | { | |
587 | char *ref_git = NULL; | |
588 | const char *repo, *ref_git_s; | |
589 | int seen_error = 0; | |
590 | ||
591 | ref_git_s = real_path_if_valid(path); | |
592 | if (!ref_git_s) { | |
593 | seen_error = 1; | |
594 | strbuf_addf(err, _("path '%s' does not exist"), path); | |
595 | goto out; | |
596 | } else | |
597 | /* | |
598 | * Beware: read_gitfile(), real_path() and mkpath() | |
599 | * return static buffer | |
600 | */ | |
601 | ref_git = xstrdup(ref_git_s); | |
602 | ||
603 | repo = read_gitfile(ref_git); | |
604 | if (!repo) | |
605 | repo = read_gitfile(mkpath("%s/.git", ref_git)); | |
606 | if (repo) { | |
607 | free(ref_git); | |
608 | ref_git = xstrdup(repo); | |
609 | } | |
610 | ||
611 | if (!repo && is_directory(mkpath("%s/.git/objects", ref_git))) { | |
612 | char *ref_git_git = mkpathdup("%s/.git", ref_git); | |
613 | free(ref_git); | |
614 | ref_git = ref_git_git; | |
615 | } else if (!is_directory(mkpath("%s/objects", ref_git))) { | |
616 | struct strbuf sb = STRBUF_INIT; | |
617 | seen_error = 1; | |
618 | if (get_common_dir(&sb, ref_git)) { | |
619 | strbuf_addf(err, | |
620 | _("reference repository '%s' as a linked " | |
621 | "checkout is not supported yet."), | |
622 | path); | |
623 | goto out; | |
624 | } | |
625 | ||
626 | strbuf_addf(err, _("reference repository '%s' is not a " | |
627 | "local repository."), path); | |
628 | goto out; | |
629 | } | |
630 | ||
631 | if (!access(mkpath("%s/shallow", ref_git), F_OK)) { | |
632 | strbuf_addf(err, _("reference repository '%s' is shallow"), | |
633 | path); | |
634 | seen_error = 1; | |
635 | goto out; | |
636 | } | |
637 | ||
638 | if (!access(mkpath("%s/info/grafts", ref_git), F_OK)) { | |
639 | strbuf_addf(err, | |
640 | _("reference repository '%s' is grafted"), | |
641 | path); | |
642 | seen_error = 1; | |
643 | goto out; | |
644 | } | |
645 | ||
646 | out: | |
647 | if (seen_error) { | |
6a83d902 | 648 | FREE_AND_NULL(ref_git); |
9eeea7d2 SB |
649 | } |
650 | ||
651 | return ref_git; | |
652 | } | |
653 | ||
fe1b2268 | 654 | int foreach_alt_odb(alt_odb_fn fn, void *cb) |
d79796bc JH |
655 | { |
656 | struct alternate_object_database *ent; | |
fe1b2268 | 657 | int r = 0; |
d79796bc JH |
658 | |
659 | prepare_alt_odb(); | |
fe1b2268 JK |
660 | for (ent = alt_odb_list; ent; ent = ent->next) { |
661 | r = fn(ent, cb); | |
662 | if (r) | |
663 | break; | |
664 | } | |
665 | return r; | |
d79796bc JH |
666 | } |
667 | ||
c2f493a4 MW |
668 | void prepare_alt_odb(void) |
669 | { | |
554fe20d | 670 | const char *alt; |
c2f493a4 | 671 | |
7dc24aa5 SP |
672 | if (alt_odb_tail) |
673 | return; | |
674 | ||
c2f493a4 | 675 | alt = getenv(ALTERNATE_DB_ENVIRONMENT); |
c2f493a4 | 676 | |
c2f493a4 | 677 | alt_odb_tail = &alt_odb_list; |
dc732bd5 | 678 | link_alt_odb_entries(alt, PATH_SEP, NULL, 0); |
c2f493a4 MW |
679 | |
680 | read_info_alternates(get_object_directory(), 0); | |
681 | } | |
682 | ||
3096b2ec | 683 | /* Returns 1 if we have successfully freshened the file, 0 otherwise. */ |
33d4221c | 684 | static int freshen_file(const char *fn) |
ace1534d | 685 | { |
33d4221c JK |
686 | struct utimbuf t; |
687 | t.actime = t.modtime = time(NULL); | |
688 | return !utime(fn, &t); | |
0f4dc14a | 689 | } |
ace1534d | 690 | |
3096b2ec JK |
691 | /* |
692 | * All of the check_and_freshen functions return 1 if the file exists and was | |
693 | * freshened (if freshening was requested), 0 otherwise. If they return | |
694 | * 0, you should not assume that it is safe to skip a write of the object (it | |
695 | * either does not exist on disk, or has a stale mtime and may be subject to | |
696 | * pruning). | |
697 | */ | |
6a5e6f5e | 698 | int check_and_freshen_file(const char *fn, int freshen) |
33d4221c JK |
699 | { |
700 | if (access(fn, F_OK)) | |
701 | return 0; | |
3096b2ec | 702 | if (freshen && !freshen_file(fn)) |
33d4221c JK |
703 | return 0; |
704 | return 1; | |
705 | } | |
706 | ||
707 | static int check_and_freshen_local(const unsigned char *sha1, int freshen) | |
708 | { | |
ea657730 CC |
709 | static struct strbuf buf = STRBUF_INIT; |
710 | ||
711 | strbuf_reset(&buf); | |
712 | sha1_file_name(&buf, sha1); | |
713 | ||
714 | return check_and_freshen_file(buf.buf, freshen); | |
33d4221c JK |
715 | } |
716 | ||
717 | static int check_and_freshen_nonlocal(const unsigned char *sha1, int freshen) | |
0f4dc14a BC |
718 | { |
719 | struct alternate_object_database *alt; | |
9a217f2a | 720 | prepare_alt_odb(); |
d5a63b99 | 721 | for (alt = alt_odb_list; alt; alt = alt->next) { |
29ec6af2 JK |
722 | const char *path = alt_sha1_path(alt, sha1); |
723 | if (check_and_freshen_file(path, freshen)) | |
c529d75a | 724 | return 1; |
ace1534d | 725 | } |
c529d75a | 726 | return 0; |
ace1534d JH |
727 | } |
728 | ||
33d4221c JK |
729 | static int check_and_freshen(const unsigned char *sha1, int freshen) |
730 | { | |
731 | return check_and_freshen_local(sha1, freshen) || | |
732 | check_and_freshen_nonlocal(sha1, freshen); | |
733 | } | |
734 | ||
735 | int has_loose_object_nonlocal(const unsigned char *sha1) | |
736 | { | |
737 | return check_and_freshen_nonlocal(sha1, 0); | |
738 | } | |
739 | ||
0f4dc14a BC |
740 | static int has_loose_object(const unsigned char *sha1) |
741 | { | |
33d4221c | 742 | return check_and_freshen(sha1, 0); |
0f4dc14a BC |
743 | } |
744 | ||
02710228 SP |
745 | static void mmap_limit_check(size_t length) |
746 | { | |
747 | static size_t limit = 0; | |
748 | if (!limit) { | |
749 | limit = git_env_ulong("GIT_MMAP_LIMIT", 0); | |
750 | if (!limit) | |
751 | limit = SIZE_MAX; | |
752 | } | |
753 | if (length > limit) | |
754 | die("attempting to mmap %"PRIuMAX" over limit %"PRIuMAX, | |
755 | (uintmax_t)length, (uintmax_t)limit); | |
756 | } | |
757 | ||
1570856b JK |
758 | void *xmmap_gently(void *start, size_t length, |
759 | int prot, int flags, int fd, off_t offset) | |
58ecbd5e | 760 | { |
02710228 SP |
761 | void *ret; |
762 | ||
763 | mmap_limit_check(length); | |
764 | ret = mmap(start, length, prot, flags, fd, offset); | |
58ecbd5e JN |
765 | if (ret == MAP_FAILED) { |
766 | if (!length) | |
767 | return NULL; | |
7c3ecb32 | 768 | release_pack_memory(length); |
58ecbd5e | 769 | ret = mmap(start, length, prot, flags, fd, offset); |
58ecbd5e JN |
770 | } |
771 | return ret; | |
772 | } | |
773 | ||
1570856b JK |
774 | void *xmmap(void *start, size_t length, |
775 | int prot, int flags, int fd, off_t offset) | |
776 | { | |
777 | void *ret = xmmap_gently(start, length, prot, flags, fd, offset); | |
778 | if (ret == MAP_FAILED) | |
9ca0aaf6 | 779 | die_errno("mmap failed"); |
1570856b JK |
780 | return ret; |
781 | } | |
782 | ||
88d0db55 | 783 | /* |
090ea126 NTND |
784 | * With an in-core object data in "map", rehash it to make sure the |
785 | * object name actually matches "sha1" to detect object corruption. | |
786 | * With "map" == NULL, try reading the object named with "sha1" using | |
787 | * the streaming interface and rehash it to do the same. | |
88d0db55 | 788 | */ |
090ea126 NTND |
789 | int check_sha1_signature(const unsigned char *sha1, void *map, |
790 | unsigned long size, const char *type) | |
88d0db55 | 791 | { |
0fcfd160 | 792 | unsigned char real_sha1[20]; |
090ea126 NTND |
793 | enum object_type obj_type; |
794 | struct git_istream *st; | |
795 | git_SHA_CTX c; | |
796 | char hdr[32]; | |
797 | int hdrlen; | |
88d0db55 | 798 | |
090ea126 NTND |
799 | if (map) { |
800 | hash_sha1_file(map, size, type, real_sha1); | |
801 | return hashcmp(sha1, real_sha1) ? -1 : 0; | |
88d0db55 BC |
802 | } |
803 | ||
090ea126 NTND |
804 | st = open_istream(sha1, &obj_type, &size, NULL); |
805 | if (!st) | |
806 | return -1; | |
88d0db55 | 807 | |
090ea126 | 808 | /* Generate the header */ |
ef1286d3 | 809 | hdrlen = xsnprintf(hdr, sizeof(hdr), "%s %lu", typename(obj_type), size) + 1; |
88d0db55 | 810 | |
090ea126 NTND |
811 | /* Sha1.. */ |
812 | git_SHA1_Init(&c); | |
813 | git_SHA1_Update(&c, hdr, hdrlen); | |
814 | for (;;) { | |
815 | char buf[1024 * 16]; | |
816 | ssize_t readlen = read_istream(st, buf, sizeof(buf)); | |
1f688557 | 817 | |
f54fac53 JK |
818 | if (readlen < 0) { |
819 | close_istream(st); | |
820 | return -1; | |
821 | } | |
090ea126 NTND |
822 | if (!readlen) |
823 | break; | |
824 | git_SHA1_Update(&c, buf, readlen); | |
fa5fc15d | 825 | } |
090ea126 NTND |
826 | git_SHA1_Final(real_sha1, &c); |
827 | close_istream(st); | |
a89fccd2 | 828 | return hashcmp(sha1, real_sha1) ? -1 : 0; |
fa5fc15d SP |
829 | } |
830 | ||
1b8ac5ea | 831 | int git_open_cloexec(const char *name, int flags) |
a0788266 | 832 | { |
1e3001a8 JH |
833 | int fd; |
834 | static int o_cloexec = O_CLOEXEC; | |
a0788266 | 835 | |
1e3001a8 JH |
836 | fd = open(name, flags | o_cloexec); |
837 | if ((o_cloexec & O_CLOEXEC) && fd < 0 && errno == EINVAL) { | |
cd66ada0 | 838 | /* Try again w/o O_CLOEXEC: the kernel might not support it */ |
1e3001a8 JH |
839 | o_cloexec &= ~O_CLOEXEC; |
840 | fd = open(name, flags | o_cloexec); | |
491a8dec | 841 | } |
491a8dec | 842 | |
9fb9495d | 843 | #if defined(F_GETFD) && defined(F_SETFD) && defined(FD_CLOEXEC) |
491a8dec | 844 | { |
1e3001a8 | 845 | static int fd_cloexec = FD_CLOEXEC; |
a0788266 | 846 | |
1e3001a8 JH |
847 | if (!o_cloexec && 0 <= fd && fd_cloexec) { |
848 | /* Opened w/o O_CLOEXEC? try with fcntl(2) to add it */ | |
9fb9495d EW |
849 | int flags = fcntl(fd, F_GETFD); |
850 | if (fcntl(fd, F_SETFD, flags | fd_cloexec)) | |
1e3001a8 | 851 | fd_cloexec = 0; |
cd66ada0 | 852 | } |
44d1c19e | 853 | } |
a0788266 | 854 | #endif |
1b8ac5ea | 855 | return fd; |
a0788266 JS |
856 | } |
857 | ||
3cf8b462 | 858 | /* |
771e7d57 JK |
859 | * Find "sha1" as a loose object in the local repository or in an alternate. |
860 | * Returns 0 on success, negative on failure. | |
861 | * | |
862 | * The "path" out-parameter will give the path of the object we found (if any). | |
863 | * Note that it may point to static storage and is only valid until another | |
864 | * call to sha1_file_name(), etc. | |
3cf8b462 | 865 | */ |
771e7d57 JK |
866 | static int stat_sha1_file(const unsigned char *sha1, struct stat *st, |
867 | const char **path) | |
1f688557 | 868 | { |
052fe5ea | 869 | struct alternate_object_database *alt; |
ea657730 CC |
870 | static struct strbuf buf = STRBUF_INIT; |
871 | ||
872 | strbuf_reset(&buf); | |
873 | sha1_file_name(&buf, sha1); | |
874 | *path = buf.buf; | |
d079837e | 875 | |
771e7d57 | 876 | if (!lstat(*path, st)) |
052fe5ea | 877 | return 0; |
c7934306 | 878 | |
052fe5ea JK |
879 | prepare_alt_odb(); |
880 | errno = ENOENT; | |
881 | for (alt = alt_odb_list; alt; alt = alt->next) { | |
771e7d57 JK |
882 | *path = alt_sha1_path(alt, sha1); |
883 | if (!lstat(*path, st)) | |
052fe5ea | 884 | return 0; |
c7934306 SP |
885 | } |
886 | ||
3cf8b462 SP |
887 | return -1; |
888 | } | |
889 | ||
771e7d57 JK |
890 | /* |
891 | * Like stat_sha1_file(), but actually open the object and return the | |
892 | * descriptor. See the caveats on the "path" parameter above. | |
893 | */ | |
894 | static int open_sha1_file(const unsigned char *sha1, const char **path) | |
60bb8b14 | 895 | { |
44d1c19e | 896 | int fd; |
44d1c19e | 897 | struct alternate_object_database *alt; |
d6c8a05b | 898 | int most_interesting_errno; |
ea657730 CC |
899 | static struct strbuf buf = STRBUF_INIT; |
900 | ||
901 | strbuf_reset(&buf); | |
902 | sha1_file_name(&buf, sha1); | |
903 | *path = buf.buf; | |
60bb8b14 | 904 | |
771e7d57 | 905 | fd = git_open(*path); |
44d1c19e LT |
906 | if (fd >= 0) |
907 | return fd; | |
d6c8a05b | 908 | most_interesting_errno = errno; |
03e79c88 | 909 | |
44d1c19e | 910 | prepare_alt_odb(); |
44d1c19e | 911 | for (alt = alt_odb_list; alt; alt = alt->next) { |
771e7d57 JK |
912 | *path = alt_sha1_path(alt, sha1); |
913 | fd = git_open(*path); | |
44d1c19e LT |
914 | if (fd >= 0) |
915 | return fd; | |
d6c8a05b JK |
916 | if (most_interesting_errno == ENOENT) |
917 | most_interesting_errno = errno; | |
03e79c88 | 918 | } |
d6c8a05b | 919 | errno = most_interesting_errno; |
44d1c19e | 920 | return -1; |
1f688557 JH |
921 | } |
922 | ||
f6371f92 JK |
923 | /* |
924 | * Map the loose object at "path" if it is not NULL, or the path found by | |
925 | * searching for a loose object named "sha1". | |
926 | */ | |
927 | static void *map_sha1_file_1(const char *path, | |
928 | const unsigned char *sha1, | |
929 | unsigned long *size) | |
27d69a46 | 930 | { |
0fcfd160 | 931 | void *map; |
144bde78 | 932 | int fd; |
84dd81c1 | 933 | |
f6371f92 JK |
934 | if (path) |
935 | fd = git_open(path); | |
8261e1f1 | 936 | else |
f6371f92 | 937 | fd = open_sha1_file(sha1, &path); |
44d1c19e LT |
938 | map = NULL; |
939 | if (fd >= 0) { | |
940 | struct stat st; | |
1f688557 | 941 | |
44d1c19e LT |
942 | if (!fstat(fd, &st)) { |
943 | *size = xsize_t(st.st_size); | |
33e42de0 MM |
944 | if (!*size) { |
945 | /* mmap() is forbidden on empty files */ | |
771e7d57 | 946 | error("object file %s is empty", path); |
33e42de0 MM |
947 | return NULL; |
948 | } | |
44d1c19e | 949 | map = xmmap(NULL, *size, PROT_READ, MAP_PRIVATE, fd, 0); |
144bde78 | 950 | } |
44d1c19e | 951 | close(fd); |
74e34e1f | 952 | } |
0fcfd160 | 953 | return map; |
74e34e1f NP |
954 | } |
955 | ||
f6371f92 | 956 | void *map_sha1_file(const unsigned char *sha1, unsigned long *size) |
068f85e3 | 957 | { |
f6371f92 | 958 | return map_sha1_file_1(NULL, sha1, size); |
068f85e3 | 959 | } |
960 | ||
d21f8426 JH |
961 | static int unpack_sha1_short_header(git_zstream *stream, |
962 | unsigned char *map, unsigned long mapsize, | |
963 | void *buffer, unsigned long bufsiz) | |
47fe3f6e | 964 | { |
c4483576 LT |
965 | /* Get the data stream */ |
966 | memset(stream, 0, sizeof(*stream)); | |
967 | stream->next_in = map; | |
968 | stream->avail_in = mapsize; | |
969 | stream->next_out = buffer; | |
93821bd9 | 970 | stream->avail_out = bufsiz; |
47fe3f6e | 971 | |
39c68542 | 972 | git_inflate_init(stream); |
cc5c54e7 | 973 | return git_inflate(stream, 0); |
9a217f2a JH |
974 | } |
975 | ||
d21f8426 JH |
976 | int unpack_sha1_header(git_zstream *stream, |
977 | unsigned char *map, unsigned long mapsize, | |
978 | void *buffer, unsigned long bufsiz) | |
1f688557 | 979 | { |
d21f8426 JH |
980 | int status = unpack_sha1_short_header(stream, map, mapsize, |
981 | buffer, bufsiz); | |
42873078 | 982 | |
d21f8426 JH |
983 | if (status < Z_OK) |
984 | return status; | |
628522ec | 985 | |
d21f8426 JH |
986 | /* Make sure we have the terminating NUL */ |
987 | if (!memchr(buffer, '\0', stream->next_out - (unsigned char *)buffer)) | |
988 | return -1; | |
1f688557 JH |
989 | return 0; |
990 | } | |
991 | ||
46f03448 KN |
992 | static int unpack_sha1_header_to_strbuf(git_zstream *stream, unsigned char *map, |
993 | unsigned long mapsize, void *buffer, | |
994 | unsigned long bufsiz, struct strbuf *header) | |
d131b7af | 995 | { |
46f03448 KN |
996 | int status; |
997 | ||
d21f8426 JH |
998 | status = unpack_sha1_short_header(stream, map, mapsize, buffer, bufsiz); |
999 | if (status < Z_OK) | |
1000 | return -1; | |
d131b7af | 1001 | |
46f03448 KN |
1002 | /* |
1003 | * Check if entire header is unpacked in the first iteration. | |
d131b7af | 1004 | */ |
46f03448 KN |
1005 | if (memchr(buffer, '\0', stream->next_out - (unsigned char *)buffer)) |
1006 | return 0; | |
d131b7af | 1007 | |
46f03448 KN |
1008 | /* |
1009 | * buffer[0..bufsiz] was not large enough. Copy the partial | |
1010 | * result out to header, and then append the result of further | |
1011 | * reading the stream. | |
1012 | */ | |
1013 | strbuf_add(header, buffer, stream->next_out - (unsigned char *)buffer); | |
1014 | stream->next_out = buffer; | |
1015 | stream->avail_out = bufsiz; | |
d131b7af | 1016 | |
46f03448 KN |
1017 | do { |
1018 | status = git_inflate(stream, 0); | |
1019 | strbuf_add(header, buffer, stream->next_out - (unsigned char *)buffer); | |
1020 | if (memchr(buffer, '\0', stream->next_out - (unsigned char *)buffer)) | |
1021 | return 0; | |
1022 | stream->next_out = buffer; | |
1023 | stream->avail_out = bufsiz; | |
1024 | } while (status != Z_STREAM_END); | |
1025 | return -1; | |
d131b7af SP |
1026 | } |
1027 | ||
ef49a7a0 | 1028 | static void *unpack_sha1_rest(git_zstream *stream, void *buffer, unsigned long size, const unsigned char *sha1) |
95099731 | 1029 | { |
5180cacc | 1030 | int bytes = strlen(buffer) + 1; |
3aee68aa | 1031 | unsigned char *buf = xmallocz(size); |
93821bd9 | 1032 | unsigned long n; |
7efbff75 | 1033 | int status = Z_OK; |
95099731 | 1034 | |
93821bd9 LT |
1035 | n = stream->total_out - bytes; |
1036 | if (n > size) | |
1037 | n = size; | |
1038 | memcpy(buf, (char *) buffer + bytes, n); | |
1039 | bytes = n; | |
456cdf6e LT |
1040 | if (bytes <= size) { |
1041 | /* | |
1042 | * The above condition must be (bytes <= size), not | |
1043 | * (bytes < size). In other words, even though we | |
ccf5ace0 | 1044 | * expect no more output and set avail_out to zero, |
456cdf6e LT |
1045 | * the input zlib stream may have bytes that express |
1046 | * "this concludes the stream", and we *do* want to | |
1047 | * eat that input. | |
1048 | * | |
1049 | * Otherwise we would not be able to test that we | |
1050 | * consumed all the input to reach the expected size; | |
1051 | * we also want to check that zlib tells us that all | |
1052 | * went well with status == Z_STREAM_END at the end. | |
1053 | */ | |
5180cacc LT |
1054 | stream->next_out = buf + bytes; |
1055 | stream->avail_out = size - bytes; | |
7efbff75 | 1056 | while (status == Z_OK) |
39c68542 | 1057 | status = git_inflate(stream, Z_FINISH); |
5180cacc | 1058 | } |
456cdf6e | 1059 | if (status == Z_STREAM_END && !stream->avail_in) { |
39c68542 | 1060 | git_inflate_end(stream); |
7efbff75 | 1061 | return buf; |
95099731 NTND |
1062 | } |
1063 | ||
7efbff75 JH |
1064 | if (status < 0) |
1065 | error("corrupt loose object '%s'", sha1_to_hex(sha1)); | |
1066 | else if (stream->avail_in) | |
1067 | error("garbage at end of loose object '%s'", | |
1068 | sha1_to_hex(sha1)); | |
1069 | free(buf); | |
1070 | return NULL; | |
95099731 NTND |
1071 | } |
1072 | ||
d40d535b | 1073 | /* |
5180cacc LT |
1074 | * We used to just use "sscanf()", but that's actually way |
1075 | * too permissive for what we want to check. So do an anal | |
1076 | * object header parse by hand. | |
d40d535b | 1077 | */ |
46f03448 KN |
1078 | static int parse_sha1_header_extended(const char *hdr, struct object_info *oi, |
1079 | unsigned int flags) | |
1f688557 | 1080 | { |
46f03448 | 1081 | const char *type_buf = hdr; |
5180cacc | 1082 | unsigned long size; |
46f03448 | 1083 | int type, type_len = 0; |
43057304 | 1084 | |
5180cacc | 1085 | /* |
46f03448 | 1086 | * The type can be of any size but is followed by |
21666f1a | 1087 | * a space. |
5180cacc | 1088 | */ |
5180cacc LT |
1089 | for (;;) { |
1090 | char c = *hdr++; | |
d21f8426 JH |
1091 | if (!c) |
1092 | return -1; | |
5180cacc LT |
1093 | if (c == ' ') |
1094 | break; | |
46f03448 | 1095 | type_len++; |
5180cacc | 1096 | } |
1f688557 | 1097 | |
46f03448 KN |
1098 | type = type_from_string_gently(type_buf, type_len, 1); |
1099 | if (oi->typename) | |
1100 | strbuf_add(oi->typename, type_buf, type_len); | |
1101 | /* | |
1102 | * Set type to 0 if its an unknown object and | |
2e3a16b2 | 1103 | * we're obtaining the type using '--allow-unknown-type' |
46f03448 KN |
1104 | * option. |
1105 | */ | |
19fc5e84 | 1106 | if ((flags & OBJECT_INFO_ALLOW_UNKNOWN_TYPE) && (type < 0)) |
46f03448 KN |
1107 | type = 0; |
1108 | else if (type < 0) | |
1109 | die("invalid object type"); | |
1110 | if (oi->typep) | |
1111 | *oi->typep = type; | |
5180cacc LT |
1112 | |
1113 | /* | |
1114 | * The length must follow immediately, and be in canonical | |
1115 | * decimal format (ie "010" is not valid). | |
1116 | */ | |
1117 | size = *hdr++ - '0'; | |
1118 | if (size > 9) | |
1119 | return -1; | |
1120 | if (size) { | |
1121 | for (;;) { | |
1122 | unsigned long c = *hdr - '0'; | |
1123 | if (c > 9) | |
1124 | break; | |
1125 | hdr++; | |
1126 | size = size * 10 + c; | |
1b1005d1 | 1127 | } |
c01f51cc | 1128 | } |
46f03448 KN |
1129 | |
1130 | if (oi->sizep) | |
1131 | *oi->sizep = size; | |
5180cacc LT |
1132 | |
1133 | /* | |
1134 | * The length must be followed by a zero byte | |
1135 | */ | |
46f03448 | 1136 | return *hdr ? -1 : type; |
1f688557 JH |
1137 | } |
1138 | ||
46f03448 | 1139 | int parse_sha1_header(const char *hdr, unsigned long *sizep) |
bf592c50 | 1140 | { |
27b5c1a0 | 1141 | struct object_info oi = OBJECT_INFO_INIT; |
21666f1a | 1142 | |
46f03448 | 1143 | oi.sizep = sizep; |
1f0c0d36 | 1144 | return parse_sha1_header_extended(hdr, &oi, 0); |
bf592c50 DB |
1145 | } |
1146 | ||
052fe5ea | 1147 | static int sha1_loose_object_info(const unsigned char *sha1, |
46f03448 KN |
1148 | struct object_info *oi, |
1149 | int flags) | |
65c2e0c3 | 1150 | { |
46f03448 KN |
1151 | int status = 0; |
1152 | unsigned long mapsize; | |
65c2e0c3 | 1153 | void *map; |
ef49a7a0 | 1154 | git_zstream stream; |
d65a16f6 | 1155 | char hdr[32]; |
46f03448 | 1156 | struct strbuf hdrbuf = STRBUF_INIT; |
c84a1f3e | 1157 | unsigned long size_scratch; |
65c2e0c3 | 1158 | |
5d642e75 JK |
1159 | if (oi->delta_base_sha1) |
1160 | hashclr(oi->delta_base_sha1); | |
1161 | ||
052fe5ea JK |
1162 | /* |
1163 | * If we don't care about type or size, then we don't | |
4ef8d1dd JH |
1164 | * need to look inside the object at all. Note that we |
1165 | * do not optimize out the stat call, even if the | |
1166 | * caller doesn't care about the disk-size, since our | |
1167 | * return value implicitly indicates whether the | |
1168 | * object even exists. | |
052fe5ea | 1169 | */ |
c84a1f3e | 1170 | if (!oi->typep && !oi->typename && !oi->sizep && !oi->contentp) { |
771e7d57 | 1171 | const char *path; |
4ef8d1dd | 1172 | struct stat st; |
771e7d57 | 1173 | if (stat_sha1_file(sha1, &st, &path) < 0) |
4ef8d1dd JH |
1174 | return -1; |
1175 | if (oi->disk_sizep) | |
23c339c0 | 1176 | *oi->disk_sizep = st.st_size; |
052fe5ea JK |
1177 | return 0; |
1178 | } | |
1179 | ||
bb6b8e4f | 1180 | map = map_sha1_file(sha1, &mapsize); |
f0df4ed5 | 1181 | if (!map) |
dbea72a8 | 1182 | return -1; |
c84a1f3e JT |
1183 | |
1184 | if (!oi->sizep) | |
1185 | oi->sizep = &size_scratch; | |
1186 | ||
23c339c0 JK |
1187 | if (oi->disk_sizep) |
1188 | *oi->disk_sizep = mapsize; | |
19fc5e84 | 1189 | if ((flags & OBJECT_INFO_ALLOW_UNKNOWN_TYPE)) { |
46f03448 KN |
1190 | if (unpack_sha1_header_to_strbuf(&stream, map, mapsize, hdr, sizeof(hdr), &hdrbuf) < 0) |
1191 | status = error("unable to unpack %s header with --allow-unknown-type", | |
1192 | sha1_to_hex(sha1)); | |
1193 | } else if (unpack_sha1_header(&stream, map, mapsize, hdr, sizeof(hdr)) < 0) | |
36e4d74a JH |
1194 | status = error("unable to unpack %s header", |
1195 | sha1_to_hex(sha1)); | |
46f03448 KN |
1196 | if (status < 0) |
1197 | ; /* Do nothing */ | |
1198 | else if (hdrbuf.len) { | |
1199 | if ((status = parse_sha1_header_extended(hdrbuf.buf, oi, flags)) < 0) | |
1200 | status = error("unable to parse %s header with --allow-unknown-type", | |
1201 | sha1_to_hex(sha1)); | |
1202 | } else if ((status = parse_sha1_header_extended(hdr, oi, flags)) < 0) | |
36e4d74a | 1203 | status = error("unable to parse %s header", sha1_to_hex(sha1)); |
c84a1f3e | 1204 | |
b3ea7dd3 | 1205 | if (status >= 0 && oi->contentp) { |
c84a1f3e JT |
1206 | *oi->contentp = unpack_sha1_rest(&stream, hdr, |
1207 | *oi->sizep, sha1); | |
b3ea7dd3 JK |
1208 | if (!*oi->contentp) { |
1209 | git_inflate_end(&stream); | |
1210 | status = -1; | |
1211 | } | |
1212 | } else | |
c84a1f3e JT |
1213 | git_inflate_end(&stream); |
1214 | ||
65c2e0c3 | 1215 | munmap(map, mapsize); |
46f03448 | 1216 | if (status && oi->typep) |
23c339c0 | 1217 | *oi->typep = status; |
c84a1f3e JT |
1218 | if (oi->sizep == &size_scratch) |
1219 | oi->sizep = NULL; | |
46f03448 | 1220 | strbuf_release(&hdrbuf); |
3ab0fb06 | 1221 | oi->whence = OI_LOOSE; |
93cff9a9 | 1222 | return (status < 0) ? status : 0; |
65c2e0c3 JH |
1223 | } |
1224 | ||
8b4c0103 JT |
1225 | int fetch_if_missing = 1; |
1226 | ||
de7b5d62 | 1227 | int sha1_object_info_extended(const unsigned char *sha1, struct object_info *oi, unsigned flags) |
f0df4ed5 | 1228 | { |
cd585e2a | 1229 | static struct object_info blank_oi = OBJECT_INFO_INIT; |
f0df4ed5 | 1230 | struct pack_entry e; |
5b086407 | 1231 | int rtype; |
1f0c0d36 JT |
1232 | const unsigned char *real = (flags & OBJECT_INFO_LOOKUP_REPLACE) ? |
1233 | lookup_replace_object(sha1) : | |
1234 | sha1; | |
8b4c0103 | 1235 | int already_retried = 0; |
f0df4ed5 | 1236 | |
87b5e236 JK |
1237 | if (is_null_sha1(real)) |
1238 | return -1; | |
1239 | ||
cd585e2a JT |
1240 | if (!oi) |
1241 | oi = &blank_oi; | |
1242 | ||
dfdd4afc JT |
1243 | if (!(flags & OBJECT_INFO_SKIP_CACHED)) { |
1244 | struct cached_object *co = find_cached_object(real); | |
1245 | if (co) { | |
1246 | if (oi->typep) | |
1247 | *(oi->typep) = co->type; | |
1248 | if (oi->sizep) | |
1249 | *(oi->sizep) = co->size; | |
1250 | if (oi->disk_sizep) | |
1251 | *(oi->disk_sizep) = 0; | |
1252 | if (oi->delta_base_sha1) | |
1253 | hashclr(oi->delta_base_sha1); | |
1254 | if (oi->typename) | |
1255 | strbuf_addstr(oi->typename, typename(co->type)); | |
1256 | if (oi->contentp) | |
1257 | *oi->contentp = xmemdupz(co->buf, co->size); | |
1258 | oi->whence = OI_CACHED; | |
1259 | return 0; | |
1260 | } | |
c4d9986f NTND |
1261 | } |
1262 | ||
8b4c0103 JT |
1263 | while (1) { |
1264 | if (find_pack_entry(real, &e)) | |
1265 | break; | |
1266 | ||
ddd63e64 | 1267 | /* Most likely it's a loose object. */ |
3ab0fb06 | 1268 | if (!sha1_loose_object_info(real, oi, flags)) |
5b086407 | 1269 | return 0; |
ddd63e64 SG |
1270 | |
1271 | /* Not a loose object; someone else may have just packed it. */ | |
8b4c0103 JT |
1272 | reprepare_packed_git(); |
1273 | if (find_pack_entry(real, &e)) | |
1274 | break; | |
1275 | ||
1276 | /* Check if it is a missing object */ | |
1277 | if (fetch_if_missing && repository_format_partial_clone && | |
1278 | !already_retried) { | |
1279 | /* | |
1280 | * TODO Investigate haveing fetch_object() return | |
1281 | * TODO error/success and stopping the music here. | |
1282 | */ | |
1283 | fetch_object(repository_format_partial_clone, real); | |
1284 | already_retried = 1; | |
1285 | continue; | |
dfdd4afc | 1286 | } |
8b4c0103 JT |
1287 | |
1288 | return -1; | |
f0df4ed5 | 1289 | } |
3d77d877 | 1290 | |
cd585e2a JT |
1291 | if (oi == &blank_oi) |
1292 | /* | |
1293 | * We know that the caller doesn't actually need the | |
1294 | * information below, so return early. | |
1295 | */ | |
1296 | return 0; | |
23c339c0 | 1297 | rtype = packed_object_info(e.p, e.offset, oi); |
412916ee | 1298 | if (rtype < 0) { |
1f7117ef CC |
1299 | mark_bad_packed_object(e.p, real); |
1300 | return sha1_object_info_extended(real, oi, 0); | |
3ab0fb06 | 1301 | } else if (oi->whence == OI_PACKED) { |
9a490590 JH |
1302 | oi->u.packed.offset = e.offset; |
1303 | oi->u.packed.pack = e.p; | |
1304 | oi->u.packed.is_delta = (rtype == OBJ_REF_DELTA || | |
1305 | rtype == OBJ_OFS_DELTA); | |
3d77d877 NP |
1306 | } |
1307 | ||
5b086407 | 1308 | return 0; |
f0df4ed5 JS |
1309 | } |
1310 | ||
3fc0dca9 | 1311 | /* returns enum object_type or negative */ |
9a490590 JH |
1312 | int sha1_object_info(const unsigned char *sha1, unsigned long *sizep) |
1313 | { | |
5b086407 | 1314 | enum object_type type; |
27b5c1a0 | 1315 | struct object_info oi = OBJECT_INFO_INIT; |
9a490590 | 1316 | |
5b086407 | 1317 | oi.typep = &type; |
9a490590 | 1318 | oi.sizep = sizep; |
1f0c0d36 JT |
1319 | if (sha1_object_info_extended(sha1, &oi, |
1320 | OBJECT_INFO_LOOKUP_REPLACE) < 0) | |
5b086407 JK |
1321 | return -1; |
1322 | return type; | |
9a490590 JH |
1323 | } |
1324 | ||
f1d8130b JT |
1325 | static void *read_object(const unsigned char *sha1, enum object_type *type, |
1326 | unsigned long *size) | |
1327 | { | |
1328 | struct object_info oi = OBJECT_INFO_INIT; | |
1329 | void *content; | |
1330 | oi.typep = type; | |
1331 | oi.sizep = size; | |
1332 | oi.contentp = &content; | |
1333 | ||
1334 | if (sha1_object_info_extended(sha1, &oi, 0) < 0) | |
1335 | return NULL; | |
1336 | return content; | |
1337 | } | |
1338 | ||
21666f1a NP |
1339 | int pretend_sha1_file(void *buf, unsigned long len, enum object_type type, |
1340 | unsigned char *sha1) | |
d66b37bb JH |
1341 | { |
1342 | struct cached_object *co; | |
1343 | ||
21666f1a | 1344 | hash_sha1_file(buf, len, typename(type), sha1); |
d66b37bb JH |
1345 | if (has_sha1_file(sha1) || find_cached_object(sha1)) |
1346 | return 0; | |
c7353967 | 1347 | ALLOC_GROW(cached_objects, cached_object_nr + 1, cached_object_alloc); |
d66b37bb JH |
1348 | co = &cached_objects[cached_object_nr++]; |
1349 | co->size = len; | |
21666f1a | 1350 | co->type = type; |
efa13f7b JH |
1351 | co->buf = xmalloc(len); |
1352 | memcpy(co->buf, buf, len); | |
d66b37bb JH |
1353 | hashcpy(co->sha1, sha1); |
1354 | return 0; | |
1355 | } | |
1356 | ||
b6c4cecc JH |
1357 | /* |
1358 | * This function dies on corrupt objects; the callers who want to | |
1359 | * deal with them should arrange to call read_object() and give error | |
1360 | * messages themselves. | |
1361 | */ | |
5bf29b95 JH |
1362 | void *read_sha1_file_extended(const unsigned char *sha1, |
1363 | enum object_type *type, | |
1364 | unsigned long *size, | |
1f0c0d36 | 1365 | int lookup_replace) |
ac939109 | 1366 | { |
3ba7a065 | 1367 | void *data; |
b6c4cecc | 1368 | const struct packed_git *p; |
771e7d57 JK |
1369 | const char *path; |
1370 | struct stat st; | |
1f0c0d36 JT |
1371 | const unsigned char *repl = lookup_replace ? lookup_replace_object(sha1) |
1372 | : sha1; | |
b6c4cecc | 1373 | |
3ba7a065 JH |
1374 | errno = 0; |
1375 | data = read_object(repl, type, size); | |
4bbf5a26 | 1376 | if (data) |
b6c4cecc | 1377 | return data; |
68095570 | 1378 | |
25f3af3f | 1379 | if (errno && errno != ENOENT) |
3ba7a065 JH |
1380 | die_errno("failed to read object %s", sha1_to_hex(sha1)); |
1381 | ||
68095570 | 1382 | /* die if we replaced an object with one that does not exist */ |
b6c4cecc | 1383 | if (repl != sha1) |
68095570 CC |
1384 | die("replacement %s not found for %s", |
1385 | sha1_to_hex(repl), sha1_to_hex(sha1)); | |
1386 | ||
771e7d57 | 1387 | if (!stat_sha1_file(repl, &st, &path)) |
b6c4cecc JH |
1388 | die("loose object %s (stored in %s) is corrupt", |
1389 | sha1_to_hex(repl), path); | |
68095570 | 1390 | |
b6c4cecc JH |
1391 | if ((p = has_packed_and_bad(repl)) != NULL) |
1392 | die("packed object %s (stored in %s) is corrupt", | |
1393 | sha1_to_hex(repl), p->pack_name); | |
f5552aee | 1394 | |
b6c4cecc | 1395 | return NULL; |
ac939109 NP |
1396 | } |
1397 | ||
40469ee9 | 1398 | void *read_object_with_reference(const unsigned char *sha1, |
21666f1a | 1399 | const char *required_type_name, |
40469ee9 JH |
1400 | unsigned long *size, |
1401 | unsigned char *actual_sha1_return) | |
f4913f91 | 1402 | { |
21666f1a | 1403 | enum object_type type, required_type; |
f4913f91 JH |
1404 | void *buffer; |
1405 | unsigned long isize; | |
40469ee9 | 1406 | unsigned char actual_sha1[20]; |
f4913f91 | 1407 | |
21666f1a | 1408 | required_type = type_from_string(required_type_name); |
e702496e | 1409 | hashcpy(actual_sha1, sha1); |
40469ee9 JH |
1410 | while (1) { |
1411 | int ref_length = -1; | |
1412 | const char *ref_type = NULL; | |
f4913f91 | 1413 | |
21666f1a | 1414 | buffer = read_sha1_file(actual_sha1, &type, &isize); |
40469ee9 JH |
1415 | if (!buffer) |
1416 | return NULL; | |
21666f1a | 1417 | if (type == required_type) { |
40469ee9 JH |
1418 | *size = isize; |
1419 | if (actual_sha1_return) | |
e702496e | 1420 | hashcpy(actual_sha1_return, actual_sha1); |
40469ee9 JH |
1421 | return buffer; |
1422 | } | |
1423 | /* Handle references */ | |
21666f1a | 1424 | else if (type == OBJ_COMMIT) |
40469ee9 | 1425 | ref_type = "tree "; |
21666f1a | 1426 | else if (type == OBJ_TAG) |
40469ee9 JH |
1427 | ref_type = "object "; |
1428 | else { | |
1429 | free(buffer); | |
1430 | return NULL; | |
1431 | } | |
1432 | ref_length = strlen(ref_type); | |
f4913f91 | 1433 | |
50974ec9 MK |
1434 | if (ref_length + 40 > isize || |
1435 | memcmp(buffer, ref_type, ref_length) || | |
1d7f171c | 1436 | get_sha1_hex((char *) buffer + ref_length, actual_sha1)) { |
40469ee9 JH |
1437 | free(buffer); |
1438 | return NULL; | |
1439 | } | |
1cf58e72 | 1440 | free(buffer); |
40469ee9 JH |
1441 | /* Now we have the ID of the referred-to object in |
1442 | * actual_sha1. Check again. */ | |
f4913f91 | 1443 | } |
f4913f91 JH |
1444 | } |
1445 | ||
ce9fbf16 | 1446 | static void write_sha1_file_prepare(const void *buf, unsigned long len, |
972a9155 | 1447 | const char *type, unsigned char *sha1, |
d65a16f6 | 1448 | char *hdr, int *hdrlen) |
d410c0f5 | 1449 | { |
9126f009 | 1450 | git_SHA_CTX c; |
d410c0f5 JH |
1451 | |
1452 | /* Generate the header */ | |
ef1286d3 | 1453 | *hdrlen = xsnprintf(hdr, *hdrlen, "%s %lu", type, len)+1; |
d410c0f5 JH |
1454 | |
1455 | /* Sha1.. */ | |
9126f009 NP |
1456 | git_SHA1_Init(&c); |
1457 | git_SHA1_Update(&c, hdr, *hdrlen); | |
1458 | git_SHA1_Update(&c, buf, len); | |
1459 | git_SHA1_Final(sha1, &c); | |
d410c0f5 JH |
1460 | } |
1461 | ||
230f1322 | 1462 | /* |
5a688fe4 | 1463 | * Move the just written object into its final resting place. |
230f1322 | 1464 | */ |
cb5add58 | 1465 | int finalize_object_file(const char *tmpfile, const char *filename) |
230f1322 | 1466 | { |
e32c0a9c | 1467 | int ret = 0; |
5a688fe4 | 1468 | |
348df166 | 1469 | if (object_creation_mode == OBJECT_CREATION_USES_RENAMES) |
be66a6c4 JS |
1470 | goto try_rename; |
1471 | else if (link(tmpfile, filename)) | |
e32c0a9c | 1472 | ret = errno; |
7ebb6fca LT |
1473 | |
1474 | /* | |
1475 | * Coda hack - coda doesn't like cross-directory links, | |
1476 | * so we fall back to a rename, which will mean that it | |
1477 | * won't be able to check collisions, but that's not a | |
1478 | * big deal. | |
1479 | * | |
1480 | * The same holds for FAT formatted media. | |
1481 | * | |
3be1f18e | 1482 | * When this succeeds, we just return. We have nothing |
7ebb6fca LT |
1483 | * left to unlink. |
1484 | */ | |
1485 | if (ret && ret != EEXIST) { | |
be66a6c4 | 1486 | try_rename: |
7ebb6fca | 1487 | if (!rename(tmpfile, filename)) |
3be1f18e | 1488 | goto out; |
9e48b389 | 1489 | ret = errno; |
230f1322 | 1490 | } |
691f1a28 | 1491 | unlink_or_warn(tmpfile); |
230f1322 LT |
1492 | if (ret) { |
1493 | if (ret != EEXIST) { | |
7616c6ca | 1494 | return error_errno("unable to write sha1 filename %s", filename); |
230f1322 LT |
1495 | } |
1496 | /* FIXME!!! Collision check here ? */ | |
1497 | } | |
1498 | ||
3be1f18e | 1499 | out: |
5256b006 | 1500 | if (adjust_shared_perm(filename)) |
5a688fe4 | 1501 | return error("unable to set permission to '%s'", filename); |
230f1322 LT |
1502 | return 0; |
1503 | } | |
1504 | ||
4d548150 LT |
1505 | static int write_buffer(int fd, const void *buf, size_t len) |
1506 | { | |
d34cf19b | 1507 | if (write_in_full(fd, buf, len) < 0) |
7616c6ca | 1508 | return error_errno("file write error"); |
4d548150 LT |
1509 | return 0; |
1510 | } | |
1511 | ||
ce9fbf16 | 1512 | int hash_sha1_file(const void *buf, unsigned long len, const char *type, |
abdc3fc8 RS |
1513 | unsigned char *sha1) |
1514 | { | |
d65a16f6 | 1515 | char hdr[32]; |
ef1286d3 | 1516 | int hdrlen = sizeof(hdr); |
abdc3fc8 RS |
1517 | write_sha1_file_prepare(buf, len, type, sha1, hdr, &hdrlen); |
1518 | return 0; | |
1519 | } | |
1520 | ||
e9039dd3 LT |
1521 | /* Finalize a file on disk, and close it. */ |
1522 | static void close_sha1_file(int fd) | |
1523 | { | |
aafe9fba LT |
1524 | if (fsync_object_files) |
1525 | fsync_or_die(fd, "sha1 file"); | |
e9039dd3 | 1526 | if (close(fd) != 0) |
d824cbba | 1527 | die_errno("error when closing sha1 file"); |
e9039dd3 LT |
1528 | } |
1529 | ||
5723fe7e LT |
1530 | /* Size of directory component, including the ending '/' */ |
1531 | static inline int directory_size(const char *filename) | |
1532 | { | |
1533 | const char *s = strrchr(filename, '/'); | |
1534 | if (!s) | |
1535 | return 0; | |
1536 | return s - filename + 1; | |
1537 | } | |
1538 | ||
1539 | /* | |
1540 | * This creates a temporary file in the same directory as the final | |
1541 | * 'filename' | |
1542 | * | |
1543 | * We want to avoid cross-directory filename renames, because those | |
1544 | * can have problems on various filesystems (FAT, NFS, Coda). | |
1545 | */ | |
d4b3d11a | 1546 | static int create_tmpfile(struct strbuf *tmp, const char *filename) |
5723fe7e LT |
1547 | { |
1548 | int fd, dirlen = directory_size(filename); | |
1549 | ||
d4b3d11a JK |
1550 | strbuf_reset(tmp); |
1551 | strbuf_add(tmp, filename, dirlen); | |
1552 | strbuf_addstr(tmp, "tmp_obj_XXXXXX"); | |
1553 | fd = git_mkstemp_mode(tmp->buf, 0444); | |
cbacbf4e | 1554 | if (fd < 0 && dirlen && errno == ENOENT) { |
d4b3d11a JK |
1555 | /* |
1556 | * Make sure the directory exists; note that the contents | |
1557 | * of the buffer are undefined after mkstemp returns an | |
1558 | * error, so we have to rewrite the whole buffer from | |
1559 | * scratch. | |
1560 | */ | |
1561 | strbuf_reset(tmp); | |
1562 | strbuf_add(tmp, filename, dirlen - 1); | |
1563 | if (mkdir(tmp->buf, 0777) && errno != EEXIST) | |
b2476a60 | 1564 | return -1; |
d4b3d11a | 1565 | if (adjust_shared_perm(tmp->buf)) |
5723fe7e LT |
1566 | return -1; |
1567 | ||
1568 | /* Try again */ | |
d4b3d11a JK |
1569 | strbuf_addstr(tmp, "/tmp_obj_XXXXXX"); |
1570 | fd = git_mkstemp_mode(tmp->buf, 0444); | |
5723fe7e LT |
1571 | } |
1572 | return fd; | |
1573 | } | |
1574 | ||
bbac7311 | 1575 | static int write_loose_object(const unsigned char *sha1, char *hdr, int hdrlen, |
c00e657d | 1576 | const void *buf, unsigned long len, time_t mtime) |
0fcfd160 | 1577 | { |
915308b1 | 1578 | int fd, ret; |
9892beba | 1579 | unsigned char compressed[4096]; |
ef49a7a0 | 1580 | git_zstream stream; |
748af44c NP |
1581 | git_SHA_CTX c; |
1582 | unsigned char parano_sha1[20]; | |
d4b3d11a | 1583 | static struct strbuf tmp_file = STRBUF_INIT; |
ea657730 CC |
1584 | static struct strbuf filename = STRBUF_INIT; |
1585 | ||
1586 | strbuf_reset(&filename); | |
1587 | sha1_file_name(&filename, sha1); | |
a44c9a5e | 1588 | |
ea657730 | 1589 | fd = create_tmpfile(&tmp_file, filename.buf); |
aac17941 | 1590 | if (fd < 0) { |
35243577 | 1591 | if (errno == EACCES) |
82247e9b | 1592 | return error("insufficient permission for adding an object to repository database %s", get_object_directory()); |
916d081b | 1593 | else |
7616c6ca | 1594 | return error_errno("unable to create temporary file"); |
aac17941 LT |
1595 | } |
1596 | ||
0fcfd160 | 1597 | /* Set it up */ |
55bb5c91 | 1598 | git_deflate_init(&stream, zlib_compression_level); |
0fcfd160 | 1599 | stream.next_out = compressed; |
9892beba | 1600 | stream.avail_out = sizeof(compressed); |
748af44c | 1601 | git_SHA1_Init(&c); |
a44c9a5e LT |
1602 | |
1603 | /* First header.. */ | |
d65a16f6 | 1604 | stream.next_in = (unsigned char *)hdr; |
a44c9a5e | 1605 | stream.avail_in = hdrlen; |
55bb5c91 JH |
1606 | while (git_deflate(&stream, 0) == Z_OK) |
1607 | ; /* nothing */ | |
748af44c | 1608 | git_SHA1_Update(&c, hdr, hdrlen); |
a44c9a5e LT |
1609 | |
1610 | /* Then the data itself.. */ | |
c00e657d | 1611 | stream.next_in = (void *)buf; |
a44c9a5e | 1612 | stream.avail_in = len; |
9892beba | 1613 | do { |
748af44c | 1614 | unsigned char *in0 = stream.next_in; |
55bb5c91 | 1615 | ret = git_deflate(&stream, Z_FINISH); |
748af44c | 1616 | git_SHA1_Update(&c, in0, stream.next_in - in0); |
9892beba NP |
1617 | if (write_buffer(fd, compressed, stream.next_out - compressed) < 0) |
1618 | die("unable to write sha1 file"); | |
1619 | stream.next_out = compressed; | |
1620 | stream.avail_out = sizeof(compressed); | |
1621 | } while (ret == Z_OK); | |
1622 | ||
ac54c277 LT |
1623 | if (ret != Z_STREAM_END) |
1624 | die("unable to deflate new object %s (%d)", sha1_to_hex(sha1), ret); | |
55bb5c91 | 1625 | ret = git_deflate_end_gently(&stream); |
ac54c277 LT |
1626 | if (ret != Z_OK) |
1627 | die("deflateEnd on object %s failed (%d)", sha1_to_hex(sha1), ret); | |
748af44c NP |
1628 | git_SHA1_Final(parano_sha1, &c); |
1629 | if (hashcmp(sha1, parano_sha1) != 0) | |
1630 | die("confused by unstable object source data for %s", sha1_to_hex(sha1)); | |
ac54c277 | 1631 | |
e9039dd3 | 1632 | close_sha1_file(fd); |
0fcfd160 | 1633 | |
bbac7311 NP |
1634 | if (mtime) { |
1635 | struct utimbuf utb; | |
1636 | utb.actime = mtime; | |
1637 | utb.modtime = mtime; | |
d4b3d11a | 1638 | if (utime(tmp_file.buf, &utb) < 0) |
7616c6ca | 1639 | warning_errno("failed utime() on %s", tmp_file.buf); |
bbac7311 NP |
1640 | } |
1641 | ||
ea657730 | 1642 | return finalize_object_file(tmp_file.buf, filename.buf); |
0fcfd160 | 1643 | } |
8237b185 | 1644 | |
33d4221c JK |
1645 | static int freshen_loose_object(const unsigned char *sha1) |
1646 | { | |
1647 | return check_and_freshen(sha1, 1); | |
1648 | } | |
1649 | ||
1650 | static int freshen_packed_object(const unsigned char *sha1) | |
1651 | { | |
1652 | struct pack_entry e; | |
ee1c6c34 JK |
1653 | if (!find_pack_entry(sha1, &e)) |
1654 | return 0; | |
1655 | if (e.p->freshened) | |
1656 | return 1; | |
1657 | if (!freshen_file(e.p->pack_name)) | |
1658 | return 0; | |
1659 | e.p->freshened = 1; | |
1660 | return 1; | |
33d4221c JK |
1661 | } |
1662 | ||
1427a7ff | 1663 | int write_sha1_file(const void *buf, unsigned long len, const char *type, unsigned char *sha1) |
bbac7311 | 1664 | { |
bbac7311 | 1665 | char hdr[32]; |
ef1286d3 | 1666 | int hdrlen = sizeof(hdr); |
bbac7311 NP |
1667 | |
1668 | /* Normally if we have it in the pack then we do not bother writing | |
1669 | * it out into .git/objects/??/?{38} file. | |
1670 | */ | |
1671 | write_sha1_file_prepare(buf, len, type, sha1, hdr, &hdrlen); | |
b5f52f37 | 1672 | if (freshen_packed_object(sha1) || freshen_loose_object(sha1)) |
bbac7311 NP |
1673 | return 0; |
1674 | return write_loose_object(sha1, hdr, hdrlen, buf, len, 0); | |
1675 | } | |
1676 | ||
0c3db67c | 1677 | int hash_sha1_file_literally(const void *buf, unsigned long len, const char *type, |
da77611d | 1678 | struct object_id *oid, unsigned flags) |
0c3db67c ES |
1679 | { |
1680 | char *header; | |
1681 | int hdrlen, status = 0; | |
1682 | ||
1683 | /* type string, SP, %lu of the length plus NUL must fit this */ | |
ef1286d3 JK |
1684 | hdrlen = strlen(type) + 32; |
1685 | header = xmalloc(hdrlen); | |
da77611d | 1686 | write_sha1_file_prepare(buf, len, type, oid->hash, header, &hdrlen); |
0c3db67c ES |
1687 | |
1688 | if (!(flags & HASH_WRITE_OBJECT)) | |
1689 | goto cleanup; | |
da77611d | 1690 | if (freshen_packed_object(oid->hash) || freshen_loose_object(oid->hash)) |
0c3db67c | 1691 | goto cleanup; |
da77611d | 1692 | status = write_loose_object(oid->hash, header, hdrlen, buf, len, 0); |
0c3db67c ES |
1693 | |
1694 | cleanup: | |
1695 | free(header); | |
1696 | return status; | |
1697 | } | |
1698 | ||
bbac7311 NP |
1699 | int force_object_loose(const unsigned char *sha1, time_t mtime) |
1700 | { | |
bbac7311 NP |
1701 | void *buf; |
1702 | unsigned long len; | |
1703 | enum object_type type; | |
1704 | char hdr[32]; | |
1705 | int hdrlen; | |
1fb23e65 | 1706 | int ret; |
bbac7311 | 1707 | |
c529d75a | 1708 | if (has_loose_object(sha1)) |
bbac7311 | 1709 | return 0; |
789bf26b | 1710 | buf = read_object(sha1, &type, &len); |
bbac7311 NP |
1711 | if (!buf) |
1712 | return error("cannot read sha1_file for %s", sha1_to_hex(sha1)); | |
ef1286d3 | 1713 | hdrlen = xsnprintf(hdr, sizeof(hdr), "%s %lu", typename(type), len) + 1; |
1fb23e65 BS |
1714 | ret = write_loose_object(sha1, hdr, hdrlen, buf, len, mtime); |
1715 | free(buf); | |
1716 | ||
1717 | return ret; | |
bbac7311 NP |
1718 | } |
1719 | ||
0eeb077b | 1720 | int has_sha1_file_with_flags(const unsigned char *sha1, int flags) |
8237b185 | 1721 | { |
3e8b7d3c JN |
1722 | if (!startup_info->have_repository) |
1723 | return 0; | |
e83e71c5 JT |
1724 | return sha1_object_info_extended(sha1, NULL, |
1725 | flags | OBJECT_INFO_SKIP_CACHED) >= 0; | |
b419aa25 | 1726 | } |
1727 | ||
1728 | int has_object_file(const struct object_id *oid) | |
1729 | { | |
1730 | return has_sha1_file(oid->hash); | |
8237b185 | 1731 | } |
74400e71 | 1732 | |
5827a035 JK |
1733 | int has_object_file_with_flags(const struct object_id *oid, int flags) |
1734 | { | |
1735 | return has_sha1_file_with_flags(oid->hash, flags); | |
1736 | } | |
1737 | ||
c879daa2 NTND |
1738 | static void check_tree(const void *buf, size_t size) |
1739 | { | |
1740 | struct tree_desc desc; | |
1741 | struct name_entry entry; | |
1742 | ||
1743 | init_tree_desc(&desc, buf, size); | |
1744 | while (tree_entry(&desc, &entry)) | |
1745 | /* do nothing | |
1746 | * tree_entry() will die() on malformed entries */ | |
1747 | ; | |
1748 | } | |
1749 | ||
1750 | static void check_commit(const void *buf, size_t size) | |
1751 | { | |
1752 | struct commit c; | |
1753 | memset(&c, 0, sizeof(c)); | |
1754 | if (parse_commit_buffer(&c, buf, size)) | |
1755 | die("corrupt commit"); | |
1756 | } | |
1757 | ||
1758 | static void check_tag(const void *buf, size_t size) | |
1759 | { | |
1760 | struct tag t; | |
1761 | memset(&t, 0, sizeof(t)); | |
1762 | if (parse_tag_buffer(&t, buf, size)) | |
1763 | die("corrupt tag"); | |
1764 | } | |
1765 | ||
bcd29864 | 1766 | static int index_mem(struct object_id *oid, void *buf, size_t size, |
c4ce46fc JH |
1767 | enum object_type type, |
1768 | const char *path, unsigned flags) | |
e7332f96 | 1769 | { |
6c510bee | 1770 | int ret, re_allocated = 0; |
c4ce46fc | 1771 | int write_object = flags & HASH_WRITE_OBJECT; |
74400e71 | 1772 | |
7672db20 | 1773 | if (!type) |
edaec3fb | 1774 | type = OBJ_BLOB; |
6c510bee LT |
1775 | |
1776 | /* | |
1777 | * Convert blobs to git internal format | |
1778 | */ | |
43df4f86 | 1779 | if ((type == OBJ_BLOB) && path) { |
f285a2d7 | 1780 | struct strbuf nbuf = STRBUF_INIT; |
82b474e0 | 1781 | if (convert_to_git(&the_index, path, buf, size, &nbuf, |
8462ff43 | 1782 | get_conv_flags(flags))) { |
b315c5c0 | 1783 | buf = strbuf_detach(&nbuf, &size); |
6c510bee LT |
1784 | re_allocated = 1; |
1785 | } | |
1786 | } | |
c4ce46fc | 1787 | if (flags & HASH_FORMAT_CHECK) { |
c879daa2 NTND |
1788 | if (type == OBJ_TREE) |
1789 | check_tree(buf, size); | |
1790 | if (type == OBJ_COMMIT) | |
1791 | check_commit(buf, size); | |
1792 | if (type == OBJ_TAG) | |
1793 | check_tag(buf, size); | |
1794 | } | |
6c510bee | 1795 | |
7672db20 | 1796 | if (write_object) |
bcd29864 | 1797 | ret = write_sha1_file(buf, size, typename(type), oid->hash); |
abdc3fc8 | 1798 | else |
bcd29864 | 1799 | ret = hash_sha1_file(buf, size, typename(type), oid->hash); |
43df4f86 | 1800 | if (re_allocated) |
6c510bee | 1801 | free(buf); |
43df4f86 DP |
1802 | return ret; |
1803 | } | |
1804 | ||
bcd29864 | 1805 | static int index_stream_convert_blob(struct object_id *oid, int fd, |
9035d75a SP |
1806 | const char *path, unsigned flags) |
1807 | { | |
1808 | int ret; | |
1809 | const int write_object = flags & HASH_WRITE_OBJECT; | |
1810 | struct strbuf sbuf = STRBUF_INIT; | |
1811 | ||
1812 | assert(path); | |
1813 | assert(would_convert_to_git_filter_fd(path)); | |
1814 | ||
d6c41c20 | 1815 | convert_to_git_filter_fd(&the_index, path, fd, &sbuf, |
8462ff43 | 1816 | get_conv_flags(flags)); |
9035d75a SP |
1817 | |
1818 | if (write_object) | |
1819 | ret = write_sha1_file(sbuf.buf, sbuf.len, typename(OBJ_BLOB), | |
bcd29864 | 1820 | oid->hash); |
9035d75a SP |
1821 | else |
1822 | ret = hash_sha1_file(sbuf.buf, sbuf.len, typename(OBJ_BLOB), | |
bcd29864 | 1823 | oid->hash); |
9035d75a SP |
1824 | strbuf_release(&sbuf); |
1825 | return ret; | |
1826 | } | |
1827 | ||
bcd29864 | 1828 | static int index_pipe(struct object_id *oid, int fd, enum object_type type, |
7b41e1e1 JH |
1829 | const char *path, unsigned flags) |
1830 | { | |
1831 | struct strbuf sbuf = STRBUF_INIT; | |
1832 | int ret; | |
1833 | ||
1834 | if (strbuf_read(&sbuf, fd, 4096) >= 0) | |
bcd29864 | 1835 | ret = index_mem(oid, sbuf.buf, sbuf.len, type, path, flags); |
7b41e1e1 JH |
1836 | else |
1837 | ret = -1; | |
1838 | strbuf_release(&sbuf); | |
1839 | return ret; | |
1840 | } | |
1841 | ||
ea68b0ce DP |
1842 | #define SMALL_FILE_SIZE (32*1024) |
1843 | ||
bcd29864 | 1844 | static int index_core(struct object_id *oid, int fd, size_t size, |
7b41e1e1 JH |
1845 | enum object_type type, const char *path, |
1846 | unsigned flags) | |
43df4f86 DP |
1847 | { |
1848 | int ret; | |
43df4f86 | 1849 | |
7b41e1e1 | 1850 | if (!size) { |
bcd29864 | 1851 | ret = index_mem(oid, "", size, type, path, flags); |
ea68b0ce DP |
1852 | } else if (size <= SMALL_FILE_SIZE) { |
1853 | char *buf = xmalloc(size); | |
90dca671 JK |
1854 | ssize_t read_result = read_in_full(fd, buf, size); |
1855 | if (read_result < 0) | |
1856 | ret = error_errno("read error while indexing %s", | |
1857 | path ? path : "<unknown>"); | |
1858 | else if (read_result != size) | |
1859 | ret = error("short read while indexing %s", | |
1860 | path ? path : "<unknown>"); | |
ea68b0ce | 1861 | else |
bcd29864 | 1862 | ret = index_mem(oid, buf, size, type, path, flags); |
ea68b0ce | 1863 | free(buf); |
08bda208 | 1864 | } else { |
43df4f86 | 1865 | void *buf = xmmap(NULL, size, PROT_READ, MAP_PRIVATE, fd, 0); |
bcd29864 | 1866 | ret = index_mem(oid, buf, size, type, path, flags); |
aac17941 | 1867 | munmap(buf, size); |
08bda208 | 1868 | } |
7b41e1e1 JH |
1869 | return ret; |
1870 | } | |
1871 | ||
4dd1fbc7 | 1872 | /* |
568508e7 JH |
1873 | * This creates one packfile per large blob unless bulk-checkin |
1874 | * machinery is "plugged". | |
4dd1fbc7 JH |
1875 | * |
1876 | * This also bypasses the usual "convert-to-git" dance, and that is on | |
1877 | * purpose. We could write a streaming version of the converting | |
1878 | * functions and insert that before feeding the data to fast-import | |
4f22b101 JK |
1879 | * (or equivalent in-core API described above). However, that is |
1880 | * somewhat complicated, as we do not know the size of the filter | |
1881 | * result, which we need to know beforehand when writing a git object. | |
1882 | * Since the primary motivation for trying to stream from the working | |
1883 | * tree file and to avoid mmaping it in core is to deal with large | |
1884 | * binary blobs, they generally do not want to get any conversion, and | |
1885 | * callers should avoid this code path when filters are requested. | |
4dd1fbc7 | 1886 | */ |
7d5e1dc3 | 1887 | static int index_stream(struct object_id *oid, int fd, size_t size, |
4dd1fbc7 JH |
1888 | enum object_type type, const char *path, |
1889 | unsigned flags) | |
1890 | { | |
7d5e1dc3 | 1891 | return index_bulk_checkin(oid->hash, fd, size, type, path, flags); |
4dd1fbc7 JH |
1892 | } |
1893 | ||
e3506559 | 1894 | int index_fd(struct object_id *oid, int fd, struct stat *st, |
7b41e1e1 JH |
1895 | enum object_type type, const char *path, unsigned flags) |
1896 | { | |
1897 | int ret; | |
7b41e1e1 | 1898 | |
9079ab7c SP |
1899 | /* |
1900 | * Call xsize_t() only when needed to avoid potentially unnecessary | |
1901 | * die() for large files. | |
1902 | */ | |
9035d75a | 1903 | if (type == OBJ_BLOB && path && would_convert_to_git_filter_fd(path)) |
bcd29864 | 1904 | ret = index_stream_convert_blob(oid, fd, path, flags); |
9035d75a | 1905 | else if (!S_ISREG(st->st_mode)) |
bcd29864 | 1906 | ret = index_pipe(oid, fd, type, path, flags); |
9079ab7c | 1907 | else if (st->st_size <= big_file_threshold || type != OBJ_BLOB || |
82b474e0 | 1908 | (path && would_convert_to_git(&the_index, path))) |
bcd29864 | 1909 | ret = index_core(oid, fd, xsize_t(st->st_size), type, path, |
9079ab7c | 1910 | flags); |
4dd1fbc7 | 1911 | else |
7d5e1dc3 | 1912 | ret = index_stream(oid, fd, xsize_t(st->st_size), type, path, |
9079ab7c | 1913 | flags); |
43df4f86 | 1914 | close(fd); |
aac17941 | 1915 | return ret; |
74400e71 | 1916 | } |
ec1fcc16 | 1917 | |
98e019b0 | 1918 | int index_path(struct object_id *oid, const char *path, struct stat *st, unsigned flags) |
ec1fcc16 JH |
1919 | { |
1920 | int fd; | |
b760d3aa | 1921 | struct strbuf sb = STRBUF_INIT; |
ea8e0297 | 1922 | int rc = 0; |
ec1fcc16 JH |
1923 | |
1924 | switch (st->st_mode & S_IFMT) { | |
1925 | case S_IFREG: | |
1926 | fd = open(path, O_RDONLY); | |
1927 | if (fd < 0) | |
7616c6ca | 1928 | return error_errno("open(\"%s\")", path); |
e3506559 | 1929 | if (index_fd(oid, fd, st, OBJ_BLOB, path, flags) < 0) |
ec1fcc16 JH |
1930 | return error("%s: failed to insert into database", |
1931 | path); | |
1932 | break; | |
1933 | case S_IFLNK: | |
7616c6ca NTND |
1934 | if (strbuf_readlink(&sb, path, st->st_size)) |
1935 | return error_errno("readlink(\"%s\")", path); | |
c4ce46fc | 1936 | if (!(flags & HASH_WRITE_OBJECT)) |
98e019b0 PO |
1937 | hash_sha1_file(sb.buf, sb.len, blob_type, oid->hash); |
1938 | else if (write_sha1_file(sb.buf, sb.len, blob_type, oid->hash)) | |
ea8e0297 | 1939 | rc = error("%s: failed to insert into database", path); |
b760d3aa | 1940 | strbuf_release(&sb); |
ec1fcc16 | 1941 | break; |
f35a6d3b | 1942 | case S_IFDIR: |
a98e6101 | 1943 | return resolve_gitlink_ref(path, "HEAD", oid); |
ec1fcc16 JH |
1944 | default: |
1945 | return error("%s: unsupported file type", path); | |
1946 | } | |
ea8e0297 | 1947 | return rc; |
ec1fcc16 | 1948 | } |
a69e5429 JH |
1949 | |
1950 | int read_pack_header(int fd, struct pack_header *header) | |
1951 | { | |
f48ecd38 | 1952 | if (read_in_full(fd, header, sizeof(*header)) != sizeof(*header)) |
c697ad14 HO |
1953 | /* "eof before pack header was fully read" */ |
1954 | return PH_ERROR_EOF; | |
1955 | ||
a69e5429 JH |
1956 | if (header->hdr_signature != htonl(PACK_SIGNATURE)) |
1957 | /* "protocol error (pack signature mismatch detected)" */ | |
1958 | return PH_ERROR_PACK_SIGNATURE; | |
1959 | if (!pack_version_ok(header->hdr_version)) | |
1960 | /* "protocol error (pack version unsupported)" */ | |
1961 | return PH_ERROR_PROTOCOL; | |
1962 | return 0; | |
1963 | } | |
40d52ff7 JK |
1964 | |
1965 | void assert_sha1_type(const unsigned char *sha1, enum object_type expect) | |
1966 | { | |
1967 | enum object_type type = sha1_object_info(sha1, NULL); | |
1968 | if (type < 0) | |
1969 | die("%s is not a valid object", sha1_to_hex(sha1)); | |
1970 | if (type != expect) | |
1971 | die("%s is not a valid '%s' object", sha1_to_hex(sha1), | |
1972 | typename(expect)); | |
1973 | } | |
27e1e22d | 1974 | |
70c49050 | 1975 | int for_each_file_in_obj_subdir(unsigned int subdir_nr, |
cc817ca3 RS |
1976 | struct strbuf *path, |
1977 | each_loose_object_fn obj_cb, | |
1978 | each_loose_cruft_fn cruft_cb, | |
1979 | each_loose_subdir_fn subdir_cb, | |
1980 | void *data) | |
27e1e22d | 1981 | { |
0375f472 RS |
1982 | size_t origlen, baselen; |
1983 | DIR *dir; | |
27e1e22d JK |
1984 | struct dirent *de; |
1985 | int r = 0; | |
62a24c89 | 1986 | struct object_id oid; |
27e1e22d | 1987 | |
70c49050 RS |
1988 | if (subdir_nr > 0xff) |
1989 | BUG("invalid loose object subdirectory: %x", subdir_nr); | |
1990 | ||
0375f472 RS |
1991 | origlen = path->len; |
1992 | strbuf_complete(path, '/'); | |
1993 | strbuf_addf(path, "%02x", subdir_nr); | |
0375f472 RS |
1994 | |
1995 | dir = opendir(path->buf); | |
27e1e22d | 1996 | if (!dir) { |
0375f472 RS |
1997 | if (errno != ENOENT) |
1998 | r = error_errno("unable to open %s", path->buf); | |
1999 | strbuf_setlen(path, origlen); | |
2000 | return r; | |
27e1e22d JK |
2001 | } |
2002 | ||
62a24c89 | 2003 | oid.hash[0] = subdir_nr; |
163ee5e6 DS |
2004 | strbuf_addch(path, '/'); |
2005 | baselen = path->len; | |
62a24c89 | 2006 | |
27e1e22d | 2007 | while ((de = readdir(dir))) { |
163ee5e6 | 2008 | size_t namelen; |
27e1e22d JK |
2009 | if (is_dot_or_dotdot(de->d_name)) |
2010 | continue; | |
2011 | ||
163ee5e6 | 2012 | namelen = strlen(de->d_name); |
27e1e22d | 2013 | strbuf_setlen(path, baselen); |
163ee5e6 DS |
2014 | strbuf_add(path, de->d_name, namelen); |
2015 | if (namelen == GIT_SHA1_HEXSZ - 2 && | |
62a24c89 RS |
2016 | !hex_to_bytes(oid.hash + 1, de->d_name, |
2017 | GIT_SHA1_RAWSZ - 1)) { | |
2018 | if (obj_cb) { | |
2019 | r = obj_cb(&oid, path->buf, data); | |
2020 | if (r) | |
2021 | break; | |
27e1e22d | 2022 | } |
62a24c89 | 2023 | continue; |
27e1e22d JK |
2024 | } |
2025 | ||
2026 | if (cruft_cb) { | |
2027 | r = cruft_cb(de->d_name, path->buf, data); | |
2028 | if (r) | |
2029 | break; | |
2030 | } | |
2031 | } | |
094c7e63 | 2032 | closedir(dir); |
27e1e22d | 2033 | |
163ee5e6 | 2034 | strbuf_setlen(path, baselen - 1); |
27e1e22d JK |
2035 | if (!r && subdir_cb) |
2036 | r = subdir_cb(subdir_nr, path->buf, data); | |
2037 | ||
0375f472 RS |
2038 | strbuf_setlen(path, origlen); |
2039 | ||
27e1e22d JK |
2040 | return r; |
2041 | } | |
2042 | ||
e6f875e0 | 2043 | int for_each_loose_file_in_objdir_buf(struct strbuf *path, |
27e1e22d JK |
2044 | each_loose_object_fn obj_cb, |
2045 | each_loose_cruft_fn cruft_cb, | |
2046 | each_loose_subdir_fn subdir_cb, | |
2047 | void *data) | |
2048 | { | |
27e1e22d JK |
2049 | int r = 0; |
2050 | int i; | |
2051 | ||
27e1e22d | 2052 | for (i = 0; i < 256; i++) { |
e6f875e0 | 2053 | r = for_each_file_in_obj_subdir(i, path, obj_cb, cruft_cb, |
27e1e22d | 2054 | subdir_cb, data); |
27e1e22d JK |
2055 | if (r) |
2056 | break; | |
2057 | } | |
2058 | ||
e6f875e0 JK |
2059 | return r; |
2060 | } | |
2061 | ||
2062 | int for_each_loose_file_in_objdir(const char *path, | |
2063 | each_loose_object_fn obj_cb, | |
2064 | each_loose_cruft_fn cruft_cb, | |
2065 | each_loose_subdir_fn subdir_cb, | |
2066 | void *data) | |
2067 | { | |
2068 | struct strbuf buf = STRBUF_INIT; | |
2069 | int r; | |
2070 | ||
2071 | strbuf_addstr(&buf, path); | |
2072 | r = for_each_loose_file_in_objdir_buf(&buf, obj_cb, cruft_cb, | |
2073 | subdir_cb, data); | |
27e1e22d | 2074 | strbuf_release(&buf); |
e6f875e0 | 2075 | |
27e1e22d JK |
2076 | return r; |
2077 | } | |
660c889e JK |
2078 | |
2079 | struct loose_alt_odb_data { | |
2080 | each_loose_object_fn *cb; | |
2081 | void *data; | |
2082 | }; | |
2083 | ||
2084 | static int loose_from_alt_odb(struct alternate_object_database *alt, | |
2085 | void *vdata) | |
2086 | { | |
2087 | struct loose_alt_odb_data *data = vdata; | |
b0a42642 JM |
2088 | struct strbuf buf = STRBUF_INIT; |
2089 | int r; | |
2090 | ||
597f9134 | 2091 | strbuf_addstr(&buf, alt->path); |
b0a42642 JM |
2092 | r = for_each_loose_file_in_objdir_buf(&buf, |
2093 | data->cb, NULL, NULL, | |
2094 | data->data); | |
2095 | strbuf_release(&buf); | |
2096 | return r; | |
660c889e JK |
2097 | } |
2098 | ||
1385bb7b | 2099 | int for_each_loose_object(each_loose_object_fn cb, void *data, unsigned flags) |
660c889e JK |
2100 | { |
2101 | struct loose_alt_odb_data alt; | |
2102 | int r; | |
2103 | ||
2104 | r = for_each_loose_file_in_objdir(get_object_directory(), | |
2105 | cb, NULL, NULL, data); | |
2106 | if (r) | |
2107 | return r; | |
2108 | ||
1385bb7b JK |
2109 | if (flags & FOR_EACH_OBJECT_LOCAL_ONLY) |
2110 | return 0; | |
2111 | ||
660c889e JK |
2112 | alt.cb = cb; |
2113 | alt.data = data; | |
2114 | return foreach_alt_odb(loose_from_alt_odb, &alt); | |
2115 | } | |
2116 | ||
f6371f92 JK |
2117 | static int check_stream_sha1(git_zstream *stream, |
2118 | const char *hdr, | |
2119 | unsigned long size, | |
2120 | const char *path, | |
2121 | const unsigned char *expected_sha1) | |
2122 | { | |
2123 | git_SHA_CTX c; | |
cd02599c | 2124 | unsigned char real_sha1[GIT_MAX_RAWSZ]; |
f6371f92 JK |
2125 | unsigned char buf[4096]; |
2126 | unsigned long total_read; | |
2127 | int status = Z_OK; | |
2128 | ||
2129 | git_SHA1_Init(&c); | |
2130 | git_SHA1_Update(&c, hdr, stream->total_out); | |
2131 | ||
2132 | /* | |
2133 | * We already read some bytes into hdr, but the ones up to the NUL | |
2134 | * do not count against the object's content size. | |
2135 | */ | |
2136 | total_read = stream->total_out - strlen(hdr) - 1; | |
2137 | ||
2138 | /* | |
2139 | * This size comparison must be "<=" to read the final zlib packets; | |
2140 | * see the comment in unpack_sha1_rest for details. | |
2141 | */ | |
2142 | while (total_read <= size && | |
2143 | (status == Z_OK || status == Z_BUF_ERROR)) { | |
2144 | stream->next_out = buf; | |
2145 | stream->avail_out = sizeof(buf); | |
2146 | if (size - total_read < stream->avail_out) | |
2147 | stream->avail_out = size - total_read; | |
2148 | status = git_inflate(stream, Z_FINISH); | |
2149 | git_SHA1_Update(&c, buf, stream->next_out - buf); | |
2150 | total_read += stream->next_out - buf; | |
2151 | } | |
2152 | git_inflate_end(stream); | |
2153 | ||
2154 | if (status != Z_STREAM_END) { | |
2155 | error("corrupt loose object '%s'", sha1_to_hex(expected_sha1)); | |
2156 | return -1; | |
2157 | } | |
cce044df JK |
2158 | if (stream->avail_in) { |
2159 | error("garbage at end of loose object '%s'", | |
2160 | sha1_to_hex(expected_sha1)); | |
2161 | return -1; | |
2162 | } | |
f6371f92 JK |
2163 | |
2164 | git_SHA1_Final(real_sha1, &c); | |
2165 | if (hashcmp(expected_sha1, real_sha1)) { | |
2166 | error("sha1 mismatch for %s (expected %s)", path, | |
2167 | sha1_to_hex(expected_sha1)); | |
2168 | return -1; | |
2169 | } | |
2170 | ||
2171 | return 0; | |
2172 | } | |
2173 | ||
2174 | int read_loose_object(const char *path, | |
2175 | const unsigned char *expected_sha1, | |
2176 | enum object_type *type, | |
2177 | unsigned long *size, | |
2178 | void **contents) | |
2179 | { | |
2180 | int ret = -1; | |
f6371f92 JK |
2181 | void *map = NULL; |
2182 | unsigned long mapsize; | |
2183 | git_zstream stream; | |
2184 | char hdr[32]; | |
2185 | ||
2186 | *contents = NULL; | |
2187 | ||
2188 | map = map_sha1_file_1(path, NULL, &mapsize); | |
2189 | if (!map) { | |
2190 | error_errno("unable to mmap %s", path); | |
2191 | goto out; | |
2192 | } | |
2193 | ||
2194 | if (unpack_sha1_header(&stream, map, mapsize, hdr, sizeof(hdr)) < 0) { | |
2195 | error("unable to unpack header of %s", path); | |
2196 | goto out; | |
2197 | } | |
2198 | ||
2199 | *type = parse_sha1_header(hdr, size); | |
2200 | if (*type < 0) { | |
2201 | error("unable to parse header of %s", path); | |
2202 | git_inflate_end(&stream); | |
2203 | goto out; | |
2204 | } | |
2205 | ||
2206 | if (*type == OBJ_BLOB) { | |
2207 | if (check_stream_sha1(&stream, hdr, *size, path, expected_sha1) < 0) | |
2208 | goto out; | |
2209 | } else { | |
2210 | *contents = unpack_sha1_rest(&stream, hdr, *size, expected_sha1); | |
2211 | if (!*contents) { | |
2212 | error("unable to unpack contents of %s", path); | |
2213 | git_inflate_end(&stream); | |
2214 | goto out; | |
2215 | } | |
2216 | if (check_sha1_signature(expected_sha1, *contents, | |
2217 | *size, typename(*type))) { | |
2218 | error("sha1 mismatch for %s (expected %s)", path, | |
2219 | sha1_to_hex(expected_sha1)); | |
2220 | free(*contents); | |
2221 | goto out; | |
2222 | } | |
2223 | } | |
2224 | ||
2225 | ret = 0; /* everything checks out */ | |
2226 | ||
2227 | out: | |
2228 | if (map) | |
2229 | munmap(map, mapsize); | |
f6371f92 JK |
2230 | return ret; |
2231 | } |