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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" |
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 | |
c597ba80 NTND |
42 | /* |
43 | * This is meant to hold a *small* number of objects that you would | |
44 | * want read_sha1_file() to be able to return, but yet you do not want | |
45 | * to write them into the object store (e.g. a browse-only | |
46 | * application). | |
47 | */ | |
48 | static struct cached_object { | |
49 | unsigned char sha1[20]; | |
50 | enum object_type type; | |
51 | void *buf; | |
52 | unsigned long size; | |
53 | } *cached_objects; | |
54 | static int cached_object_nr, cached_object_alloc; | |
55 | ||
56 | static struct cached_object empty_tree = { | |
dab0d410 | 57 | EMPTY_TREE_SHA1_BIN_LITERAL, |
c597ba80 NTND |
58 | OBJ_TREE, |
59 | "", | |
60 | 0 | |
61 | }; | |
62 | ||
63 | static struct cached_object *find_cached_object(const unsigned char *sha1) | |
64 | { | |
65 | int i; | |
66 | struct cached_object *co = cached_objects; | |
67 | ||
68 | for (i = 0; i < cached_object_nr; i++, co++) { | |
69 | if (!hashcmp(co->sha1, sha1)) | |
70 | return co; | |
71 | } | |
72 | if (!hashcmp(sha1, empty_tree.sha1)) | |
73 | return &empty_tree; | |
74 | return NULL; | |
75 | } | |
76 | ||
90a6464b JH |
77 | int mkdir_in_gitdir(const char *path) |
78 | { | |
79 | if (mkdir(path, 0777)) { | |
80 | int saved_errno = errno; | |
81 | struct stat st; | |
82 | struct strbuf sb = STRBUF_INIT; | |
83 | ||
84 | if (errno != EEXIST) | |
85 | return -1; | |
86 | /* | |
87 | * Are we looking at a path in a symlinked worktree | |
88 | * whose original repository does not yet have it? | |
89 | * e.g. .git/rr-cache pointing at its original | |
90 | * repository in which the user hasn't performed any | |
91 | * conflict resolution yet? | |
92 | */ | |
93 | if (lstat(path, &st) || !S_ISLNK(st.st_mode) || | |
94 | strbuf_readlink(&sb, path, st.st_size) || | |
95 | !is_absolute_path(sb.buf) || | |
96 | mkdir(sb.buf, 0777)) { | |
97 | strbuf_release(&sb); | |
98 | errno = saved_errno; | |
99 | return -1; | |
100 | } | |
101 | strbuf_release(&sb); | |
102 | } | |
103 | return adjust_shared_perm(path); | |
104 | } | |
105 | ||
0be0521b | 106 | enum scld_error safe_create_leading_directories(char *path) |
b2cb9425 | 107 | { |
26c8ae2a | 108 | char *next_component = path + offset_1st_component(path); |
0be0521b | 109 | enum scld_error ret = SCLD_OK; |
67d42212 | 110 | |
0be0521b | 111 | while (ret == SCLD_OK && next_component) { |
f0502332 | 112 | struct stat st; |
0f527403 | 113 | char *slash = next_component, slash_character; |
f0502332 | 114 | |
0f527403 MH |
115 | while (*slash && !is_dir_sep(*slash)) |
116 | slash++; | |
117 | ||
118 | if (!*slash) | |
b2cb9425 | 119 | break; |
bf10cf70 | 120 | |
26c8ae2a | 121 | next_component = slash + 1; |
0f527403 | 122 | while (is_dir_sep(*next_component)) |
bf10cf70 | 123 | next_component++; |
26c8ae2a | 124 | if (!*next_component) |
5f0bdf50 | 125 | break; |
831651fd | 126 | |
0f527403 | 127 | slash_character = *slash; |
831651fd | 128 | *slash = '\0'; |
67d42212 JR |
129 | if (!stat(path, &st)) { |
130 | /* path exists */ | |
204a047f MH |
131 | if (!S_ISDIR(st.st_mode)) { |
132 | errno = ENOTDIR; | |
0be0521b | 133 | ret = SCLD_EXISTS; |
204a047f | 134 | } |
53a39721 | 135 | } else if (mkdir(path, 0777)) { |
928734d9 | 136 | if (errno == EEXIST && |
9e6f885d | 137 | !stat(path, &st) && S_ISDIR(st.st_mode)) |
928734d9 | 138 | ; /* somebody created it since we checked */ |
18d37e86 MH |
139 | else if (errno == ENOENT) |
140 | /* | |
141 | * Either mkdir() failed because | |
142 | * somebody just pruned the containing | |
143 | * directory, or stat() failed because | |
144 | * the file that was in our way was | |
145 | * just removed. Either way, inform | |
146 | * the caller that it might be worth | |
147 | * trying again: | |
148 | */ | |
149 | ret = SCLD_VANISHED; | |
9e6f885d | 150 | else |
0be0521b | 151 | ret = SCLD_FAILED; |
53a39721 | 152 | } else if (adjust_shared_perm(path)) { |
0be0521b | 153 | ret = SCLD_PERMS; |
457f06d6 | 154 | } |
0f527403 | 155 | *slash = slash_character; |
b2cb9425 | 156 | } |
9e6f885d | 157 | return ret; |
b2cb9425 | 158 | } |
723c31fe | 159 | |
0be0521b | 160 | enum scld_error safe_create_leading_directories_const(const char *path) |
8e21d63b | 161 | { |
02944307 | 162 | int save_errno; |
8e21d63b JK |
163 | /* path points to cache entries, so xstrdup before messing with it */ |
164 | char *buf = xstrdup(path); | |
0be0521b | 165 | enum scld_error result = safe_create_leading_directories(buf); |
02944307 MH |
166 | |
167 | save_errno = errno; | |
8e21d63b | 168 | free(buf); |
02944307 | 169 | errno = save_errno; |
8e21d63b JK |
170 | return result; |
171 | } | |
172 | ||
177978f5 MH |
173 | int raceproof_create_file(const char *path, create_file_fn fn, void *cb) |
174 | { | |
175 | /* | |
176 | * The number of times we will try to remove empty directories | |
177 | * in the way of path. This is only 1 because if another | |
178 | * process is racily creating directories that conflict with | |
179 | * us, we don't want to fight against them. | |
180 | */ | |
181 | int remove_directories_remaining = 1; | |
182 | ||
183 | /* | |
184 | * The number of times that we will try to create the | |
185 | * directories containing path. We are willing to attempt this | |
186 | * more than once, because another process could be trying to | |
187 | * clean up empty directories at the same time as we are | |
188 | * trying to create them. | |
189 | */ | |
190 | int create_directories_remaining = 3; | |
191 | ||
192 | /* A scratch copy of path, filled lazily if we need it: */ | |
193 | struct strbuf path_copy = STRBUF_INIT; | |
194 | ||
195 | int ret, save_errno; | |
196 | ||
197 | /* Sanity check: */ | |
198 | assert(*path); | |
199 | ||
200 | retry_fn: | |
201 | ret = fn(path, cb); | |
202 | save_errno = errno; | |
203 | if (!ret) | |
204 | goto out; | |
205 | ||
206 | if (errno == EISDIR && remove_directories_remaining-- > 0) { | |
207 | /* | |
208 | * A directory is in the way. Maybe it is empty; try | |
209 | * to remove it: | |
210 | */ | |
211 | if (!path_copy.len) | |
212 | strbuf_addstr(&path_copy, path); | |
213 | ||
214 | if (!remove_dir_recursively(&path_copy, REMOVE_DIR_EMPTY_ONLY)) | |
215 | goto retry_fn; | |
216 | } else if (errno == ENOENT && create_directories_remaining-- > 0) { | |
217 | /* | |
218 | * Maybe the containing directory didn't exist, or | |
219 | * maybe it was just deleted by a process that is | |
220 | * racing with us to clean up empty directories. Try | |
221 | * to create it: | |
222 | */ | |
223 | enum scld_error scld_result; | |
224 | ||
225 | if (!path_copy.len) | |
226 | strbuf_addstr(&path_copy, path); | |
227 | ||
228 | do { | |
229 | scld_result = safe_create_leading_directories(path_copy.buf); | |
230 | if (scld_result == SCLD_OK) | |
231 | goto retry_fn; | |
232 | } while (scld_result == SCLD_VANISHED && create_directories_remaining-- > 0); | |
233 | } | |
234 | ||
235 | out: | |
236 | strbuf_release(&path_copy); | |
237 | errno = save_errno; | |
238 | return ret; | |
239 | } | |
240 | ||
f7b7774f | 241 | static void fill_sha1_path(struct strbuf *buf, const unsigned char *sha1) |
ace1534d JH |
242 | { |
243 | int i; | |
244 | for (i = 0; i < 20; i++) { | |
245 | static char hex[] = "0123456789abcdef"; | |
246 | unsigned int val = sha1[i]; | |
f7b7774f JK |
247 | strbuf_addch(buf, hex[val >> 4]); |
248 | strbuf_addch(buf, hex[val & 0xf]); | |
afbba2f0 | 249 | if (!i) |
f7b7774f | 250 | strbuf_addch(buf, '/'); |
ace1534d JH |
251 | } |
252 | } | |
253 | ||
30d6c6ea | 254 | const char *sha1_file_name(const unsigned char *sha1) |
0fcfd160 | 255 | { |
f7b7774f | 256 | static struct strbuf buf = STRBUF_INIT; |
0fcfd160 | 257 | |
f7b7774f JK |
258 | strbuf_reset(&buf); |
259 | strbuf_addf(&buf, "%s/", get_object_directory()); | |
560fb6a1 | 260 | |
f7b7774f JK |
261 | fill_sha1_path(&buf, sha1); |
262 | return buf.buf; | |
0fcfd160 LT |
263 | } |
264 | ||
38dbe5f0 JK |
265 | struct strbuf *alt_scratch_buf(struct alternate_object_database *alt) |
266 | { | |
267 | strbuf_setlen(&alt->scratch, alt->base_len); | |
268 | return &alt->scratch; | |
269 | } | |
270 | ||
29ec6af2 JK |
271 | static const char *alt_sha1_path(struct alternate_object_database *alt, |
272 | const unsigned char *sha1) | |
273 | { | |
38dbe5f0 | 274 | struct strbuf *buf = alt_scratch_buf(alt); |
f7b7774f | 275 | fill_sha1_path(buf, sha1); |
38dbe5f0 | 276 | return buf->buf; |
0fcfd160 LT |
277 | } |
278 | ||
d5a63b99 JH |
279 | struct alternate_object_database *alt_odb_list; |
280 | static struct alternate_object_database **alt_odb_tail; | |
ace1534d | 281 | |
4ea82473 JK |
282 | /* |
283 | * Return non-zero iff the path is usable as an alternate object database. | |
284 | */ | |
285 | static int alt_odb_usable(struct strbuf *path, const char *normalized_objdir) | |
286 | { | |
287 | struct alternate_object_database *alt; | |
288 | ||
289 | /* Detect cases where alternate disappeared */ | |
290 | if (!is_directory(path->buf)) { | |
291 | error("object directory %s does not exist; " | |
292 | "check .git/objects/info/alternates.", | |
293 | path->buf); | |
294 | return 0; | |
295 | } | |
296 | ||
297 | /* | |
298 | * Prevent the common mistake of listing the same | |
299 | * thing twice, or object directory itself. | |
300 | */ | |
301 | for (alt = alt_odb_list; alt; alt = alt->next) { | |
ea0fc3b4 | 302 | if (!fspathcmp(path->buf, alt->path)) |
4ea82473 JK |
303 | return 0; |
304 | } | |
305 | if (!fspathcmp(path->buf, normalized_objdir)) | |
306 | return 0; | |
307 | ||
308 | return 1; | |
309 | } | |
310 | ||
ddd5d056 JH |
311 | /* |
312 | * Prepare alternate object database registry. | |
d5a63b99 JH |
313 | * |
314 | * The variable alt_odb_list points at the list of struct | |
315 | * alternate_object_database. The elements on this list come from | |
316 | * non-empty elements from colon separated ALTERNATE_DB_ENVIRONMENT | |
317 | * environment variable, and $GIT_OBJECT_DIRECTORY/info/alternates, | |
1494e038 JH |
318 | * whose contents is similar to that environment variable but can be |
319 | * LF separated. Its base points at a statically allocated buffer that | |
d5a63b99 JH |
320 | * contains "/the/directory/corresponding/to/.git/objects/...", while |
321 | * its name points just after the slash at the end of ".git/objects/" | |
322 | * in the example above, and has enough space to hold 40-byte hex | |
323 | * SHA1, an extra slash for the first level indirection, and the | |
324 | * terminating NUL. | |
ddd5d056 | 325 | */ |
2456990d | 326 | static void read_info_alternates(const char * relative_base, int depth); |
539e7506 EK |
327 | static int link_alt_odb_entry(const char *entry, const char *relative_base, |
328 | int depth, const char *normalized_objdir) | |
ace1534d | 329 | { |
c2f493a4 | 330 | struct alternate_object_database *ent; |
5bdf0a84 | 331 | struct strbuf pathbuf = STRBUF_INIT; |
d5a63b99 | 332 | |
85dadc38 | 333 | if (!is_absolute_path(entry) && relative_base) { |
4ac9006f | 334 | strbuf_realpath(&pathbuf, relative_base, 1); |
5bdf0a84 | 335 | strbuf_addch(&pathbuf, '/'); |
c2f493a4 | 336 | } |
6eac50d8 | 337 | strbuf_addstr(&pathbuf, entry); |
c2f493a4 | 338 | |
37a95862 | 339 | if (strbuf_normalize_path(&pathbuf) < 0 && relative_base) { |
670c359d JK |
340 | error("unable to normalize alternate object path: %s", |
341 | pathbuf.buf); | |
342 | strbuf_release(&pathbuf); | |
343 | return -1; | |
344 | } | |
5bdf0a84 HW |
345 | |
346 | /* | |
347 | * The trailing slash after the directory name is given by | |
348 | * this function at the end. Remove duplicates. | |
349 | */ | |
4ea82473 JK |
350 | while (pathbuf.len && pathbuf.buf[pathbuf.len - 1] == '/') |
351 | strbuf_setlen(&pathbuf, pathbuf.len - 1); | |
5bdf0a84 | 352 | |
4ea82473 JK |
353 | if (!alt_odb_usable(&pathbuf, normalized_objdir)) { |
354 | strbuf_release(&pathbuf); | |
c2f493a4 MW |
355 | return -1; |
356 | } | |
357 | ||
7f0fa2c0 | 358 | ent = alloc_alt_odb(pathbuf.buf); |
c2f493a4 MW |
359 | |
360 | /* add the alternate entry */ | |
361 | *alt_odb_tail = ent; | |
362 | alt_odb_tail = &(ent->next); | |
363 | ent->next = NULL; | |
364 | ||
365 | /* recursively add alternates */ | |
4ea82473 | 366 | read_info_alternates(pathbuf.buf, depth + 1); |
c2f493a4 | 367 | |
4ea82473 | 368 | strbuf_release(&pathbuf); |
c2f493a4 MW |
369 | return 0; |
370 | } | |
371 | ||
cf3c6352 JK |
372 | static const char *parse_alt_odb_entry(const char *string, |
373 | int sep, | |
374 | struct strbuf *out) | |
375 | { | |
376 | const char *end; | |
377 | ||
378 | strbuf_reset(out); | |
379 | ||
380 | if (*string == '#') { | |
381 | /* comment; consume up to next separator */ | |
382 | end = strchrnul(string, sep); | |
383 | } else if (*string == '"' && !unquote_c_style(out, string, &end)) { | |
384 | /* | |
385 | * quoted path; unquote_c_style has copied the | |
386 | * data for us and set "end". Broken quoting (e.g., | |
387 | * an entry that doesn't end with a quote) falls | |
388 | * back to the unquoted case below. | |
389 | */ | |
390 | } else { | |
391 | /* normal, unquoted path */ | |
392 | end = strchrnul(string, sep); | |
393 | strbuf_add(out, string, end - string); | |
394 | } | |
395 | ||
396 | if (*end) | |
397 | end++; | |
398 | return end; | |
399 | } | |
400 | ||
dc732bd5 | 401 | static void link_alt_odb_entries(const char *alt, int sep, |
c2f493a4 MW |
402 | const char *relative_base, int depth) |
403 | { | |
539e7506 | 404 | struct strbuf objdirbuf = STRBUF_INIT; |
cf3c6352 | 405 | struct strbuf entry = STRBUF_INIT; |
c2f493a4 MW |
406 | |
407 | if (depth > 5) { | |
408 | error("%s: ignoring alternate object stores, nesting too deep.", | |
409 | relative_base); | |
410 | return; | |
411 | } | |
412 | ||
f655651e | 413 | strbuf_add_absolute_path(&objdirbuf, get_object_directory()); |
670c359d JK |
414 | if (strbuf_normalize_path(&objdirbuf) < 0) |
415 | die("unable to normalize object directory: %s", | |
416 | objdirbuf.buf); | |
539e7506 | 417 | |
cf3c6352 JK |
418 | while (*alt) { |
419 | alt = parse_alt_odb_entry(alt, sep, &entry); | |
420 | if (!entry.len) | |
9577e7e3 | 421 | continue; |
cf3c6352 | 422 | link_alt_odb_entry(entry.buf, relative_base, depth, objdirbuf.buf); |
9577e7e3 | 423 | } |
cf3c6352 | 424 | strbuf_release(&entry); |
539e7506 | 425 | strbuf_release(&objdirbuf); |
d5a63b99 JH |
426 | } |
427 | ||
2456990d | 428 | static void read_info_alternates(const char * relative_base, int depth) |
d5a63b99 | 429 | { |
5015f01c | 430 | char *path; |
dc732bd5 | 431 | struct strbuf buf = STRBUF_INIT; |
d5a63b99 | 432 | |
5015f01c | 433 | path = xstrfmt("%s/info/alternates", relative_base); |
dc732bd5 | 434 | if (strbuf_read_file(&buf, path, 1024) < 0) { |
f0f7bebe | 435 | warn_on_fopen_errors(path); |
dc732bd5 | 436 | free(path); |
9a217f2a | 437 | return; |
ace1534d | 438 | } |
d5a63b99 | 439 | |
dc732bd5 JK |
440 | link_alt_odb_entries(buf.buf, '\n', relative_base, depth); |
441 | strbuf_release(&buf); | |
442 | free(path); | |
ace1534d JH |
443 | } |
444 | ||
7f0fa2c0 JK |
445 | struct alternate_object_database *alloc_alt_odb(const char *dir) |
446 | { | |
447 | struct alternate_object_database *ent; | |
7f0fa2c0 | 448 | |
597f9134 | 449 | FLEX_ALLOC_STR(ent, path, dir); |
38dbe5f0 JK |
450 | strbuf_init(&ent->scratch, 0); |
451 | strbuf_addf(&ent->scratch, "%s/", dir); | |
452 | ent->base_len = ent->scratch.len; | |
7f0fa2c0 JK |
453 | |
454 | return ent; | |
455 | } | |
456 | ||
bef70b22 DB |
457 | void add_to_alternates_file(const char *reference) |
458 | { | |
459 | struct lock_file *lock = xcalloc(1, sizeof(struct lock_file)); | |
77b9b1d1 JK |
460 | char *alts = git_pathdup("objects/info/alternates"); |
461 | FILE *in, *out; | |
462 | ||
463 | hold_lock_file_for_update(lock, alts, LOCK_DIE_ON_ERROR); | |
464 | out = fdopen_lock_file(lock, "w"); | |
465 | if (!out) | |
466 | die_errno("unable to fdopen alternates lockfile"); | |
467 | ||
468 | in = fopen(alts, "r"); | |
469 | if (in) { | |
470 | struct strbuf line = STRBUF_INIT; | |
471 | int found = 0; | |
472 | ||
3f163962 | 473 | while (strbuf_getline(&line, in) != EOF) { |
77b9b1d1 JK |
474 | if (!strcmp(reference, line.buf)) { |
475 | found = 1; | |
476 | break; | |
477 | } | |
478 | fprintf_or_die(out, "%s\n", line.buf); | |
479 | } | |
480 | ||
481 | strbuf_release(&line); | |
482 | fclose(in); | |
483 | ||
484 | if (found) { | |
485 | rollback_lock_file(lock); | |
486 | lock = NULL; | |
487 | } | |
488 | } | |
489 | else if (errno != ENOENT) | |
490 | die_errno("unable to read alternates file"); | |
491 | ||
492 | if (lock) { | |
493 | fprintf_or_die(out, "%s\n", reference); | |
494 | if (commit_lock_file(lock)) | |
495 | die_errno("unable to move new alternates file into place"); | |
496 | if (alt_odb_tail) | |
dc732bd5 | 497 | link_alt_odb_entries(reference, '\n', NULL, 0); |
77b9b1d1 JK |
498 | } |
499 | free(alts); | |
bef70b22 DB |
500 | } |
501 | ||
a5b34d21 JK |
502 | void add_to_alternates_memory(const char *reference) |
503 | { | |
504 | /* | |
505 | * Make sure alternates are initialized, or else our entry may be | |
506 | * overwritten when they are. | |
507 | */ | |
508 | prepare_alt_odb(); | |
509 | ||
dc732bd5 | 510 | link_alt_odb_entries(reference, '\n', NULL, 0); |
a5b34d21 JK |
511 | } |
512 | ||
9eeea7d2 SB |
513 | /* |
514 | * Compute the exact path an alternate is at and returns it. In case of | |
515 | * error NULL is returned and the human readable error is added to `err` | |
516 | * `path` may be relative and should point to $GITDIR. | |
517 | * `err` must not be null. | |
518 | */ | |
519 | char *compute_alternate_path(const char *path, struct strbuf *err) | |
520 | { | |
521 | char *ref_git = NULL; | |
522 | const char *repo, *ref_git_s; | |
523 | int seen_error = 0; | |
524 | ||
525 | ref_git_s = real_path_if_valid(path); | |
526 | if (!ref_git_s) { | |
527 | seen_error = 1; | |
528 | strbuf_addf(err, _("path '%s' does not exist"), path); | |
529 | goto out; | |
530 | } else | |
531 | /* | |
532 | * Beware: read_gitfile(), real_path() and mkpath() | |
533 | * return static buffer | |
534 | */ | |
535 | ref_git = xstrdup(ref_git_s); | |
536 | ||
537 | repo = read_gitfile(ref_git); | |
538 | if (!repo) | |
539 | repo = read_gitfile(mkpath("%s/.git", ref_git)); | |
540 | if (repo) { | |
541 | free(ref_git); | |
542 | ref_git = xstrdup(repo); | |
543 | } | |
544 | ||
545 | if (!repo && is_directory(mkpath("%s/.git/objects", ref_git))) { | |
546 | char *ref_git_git = mkpathdup("%s/.git", ref_git); | |
547 | free(ref_git); | |
548 | ref_git = ref_git_git; | |
549 | } else if (!is_directory(mkpath("%s/objects", ref_git))) { | |
550 | struct strbuf sb = STRBUF_INIT; | |
551 | seen_error = 1; | |
552 | if (get_common_dir(&sb, ref_git)) { | |
553 | strbuf_addf(err, | |
554 | _("reference repository '%s' as a linked " | |
555 | "checkout is not supported yet."), | |
556 | path); | |
557 | goto out; | |
558 | } | |
559 | ||
560 | strbuf_addf(err, _("reference repository '%s' is not a " | |
561 | "local repository."), path); | |
562 | goto out; | |
563 | } | |
564 | ||
565 | if (!access(mkpath("%s/shallow", ref_git), F_OK)) { | |
566 | strbuf_addf(err, _("reference repository '%s' is shallow"), | |
567 | path); | |
568 | seen_error = 1; | |
569 | goto out; | |
570 | } | |
571 | ||
572 | if (!access(mkpath("%s/info/grafts", ref_git), F_OK)) { | |
573 | strbuf_addf(err, | |
574 | _("reference repository '%s' is grafted"), | |
575 | path); | |
576 | seen_error = 1; | |
577 | goto out; | |
578 | } | |
579 | ||
580 | out: | |
581 | if (seen_error) { | |
6a83d902 | 582 | FREE_AND_NULL(ref_git); |
9eeea7d2 SB |
583 | } |
584 | ||
585 | return ref_git; | |
586 | } | |
587 | ||
fe1b2268 | 588 | int foreach_alt_odb(alt_odb_fn fn, void *cb) |
d79796bc JH |
589 | { |
590 | struct alternate_object_database *ent; | |
fe1b2268 | 591 | int r = 0; |
d79796bc JH |
592 | |
593 | prepare_alt_odb(); | |
fe1b2268 JK |
594 | for (ent = alt_odb_list; ent; ent = ent->next) { |
595 | r = fn(ent, cb); | |
596 | if (r) | |
597 | break; | |
598 | } | |
599 | return r; | |
d79796bc JH |
600 | } |
601 | ||
c2f493a4 MW |
602 | void prepare_alt_odb(void) |
603 | { | |
554fe20d | 604 | const char *alt; |
c2f493a4 | 605 | |
7dc24aa5 SP |
606 | if (alt_odb_tail) |
607 | return; | |
608 | ||
c2f493a4 MW |
609 | alt = getenv(ALTERNATE_DB_ENVIRONMENT); |
610 | if (!alt) alt = ""; | |
611 | ||
c2f493a4 | 612 | alt_odb_tail = &alt_odb_list; |
dc732bd5 | 613 | link_alt_odb_entries(alt, PATH_SEP, NULL, 0); |
c2f493a4 MW |
614 | |
615 | read_info_alternates(get_object_directory(), 0); | |
616 | } | |
617 | ||
3096b2ec | 618 | /* Returns 1 if we have successfully freshened the file, 0 otherwise. */ |
33d4221c | 619 | static int freshen_file(const char *fn) |
ace1534d | 620 | { |
33d4221c JK |
621 | struct utimbuf t; |
622 | t.actime = t.modtime = time(NULL); | |
623 | return !utime(fn, &t); | |
0f4dc14a | 624 | } |
ace1534d | 625 | |
3096b2ec JK |
626 | /* |
627 | * All of the check_and_freshen functions return 1 if the file exists and was | |
628 | * freshened (if freshening was requested), 0 otherwise. If they return | |
629 | * 0, you should not assume that it is safe to skip a write of the object (it | |
630 | * either does not exist on disk, or has a stale mtime and may be subject to | |
631 | * pruning). | |
632 | */ | |
6a5e6f5e | 633 | int check_and_freshen_file(const char *fn, int freshen) |
33d4221c JK |
634 | { |
635 | if (access(fn, F_OK)) | |
636 | return 0; | |
3096b2ec | 637 | if (freshen && !freshen_file(fn)) |
33d4221c JK |
638 | return 0; |
639 | return 1; | |
640 | } | |
641 | ||
642 | static int check_and_freshen_local(const unsigned char *sha1, int freshen) | |
643 | { | |
644 | return check_and_freshen_file(sha1_file_name(sha1), freshen); | |
645 | } | |
646 | ||
647 | static int check_and_freshen_nonlocal(const unsigned char *sha1, int freshen) | |
0f4dc14a BC |
648 | { |
649 | struct alternate_object_database *alt; | |
9a217f2a | 650 | prepare_alt_odb(); |
d5a63b99 | 651 | for (alt = alt_odb_list; alt; alt = alt->next) { |
29ec6af2 JK |
652 | const char *path = alt_sha1_path(alt, sha1); |
653 | if (check_and_freshen_file(path, freshen)) | |
c529d75a | 654 | return 1; |
ace1534d | 655 | } |
c529d75a | 656 | return 0; |
ace1534d JH |
657 | } |
658 | ||
33d4221c JK |
659 | static int check_and_freshen(const unsigned char *sha1, int freshen) |
660 | { | |
661 | return check_and_freshen_local(sha1, freshen) || | |
662 | check_and_freshen_nonlocal(sha1, freshen); | |
663 | } | |
664 | ||
665 | int has_loose_object_nonlocal(const unsigned char *sha1) | |
666 | { | |
667 | return check_and_freshen_nonlocal(sha1, 0); | |
668 | } | |
669 | ||
0f4dc14a BC |
670 | static int has_loose_object(const unsigned char *sha1) |
671 | { | |
33d4221c | 672 | return check_and_freshen(sha1, 0); |
0f4dc14a BC |
673 | } |
674 | ||
02710228 SP |
675 | static void mmap_limit_check(size_t length) |
676 | { | |
677 | static size_t limit = 0; | |
678 | if (!limit) { | |
679 | limit = git_env_ulong("GIT_MMAP_LIMIT", 0); | |
680 | if (!limit) | |
681 | limit = SIZE_MAX; | |
682 | } | |
683 | if (length > limit) | |
684 | die("attempting to mmap %"PRIuMAX" over limit %"PRIuMAX, | |
685 | (uintmax_t)length, (uintmax_t)limit); | |
686 | } | |
687 | ||
1570856b JK |
688 | void *xmmap_gently(void *start, size_t length, |
689 | int prot, int flags, int fd, off_t offset) | |
58ecbd5e | 690 | { |
02710228 SP |
691 | void *ret; |
692 | ||
693 | mmap_limit_check(length); | |
694 | ret = mmap(start, length, prot, flags, fd, offset); | |
58ecbd5e JN |
695 | if (ret == MAP_FAILED) { |
696 | if (!length) | |
697 | return NULL; | |
7c3ecb32 | 698 | release_pack_memory(length); |
58ecbd5e | 699 | ret = mmap(start, length, prot, flags, fd, offset); |
58ecbd5e JN |
700 | } |
701 | return ret; | |
702 | } | |
703 | ||
1570856b JK |
704 | void *xmmap(void *start, size_t length, |
705 | int prot, int flags, int fd, off_t offset) | |
706 | { | |
707 | void *ret = xmmap_gently(start, length, prot, flags, fd, offset); | |
708 | if (ret == MAP_FAILED) | |
9ca0aaf6 | 709 | die_errno("mmap failed"); |
1570856b JK |
710 | return ret; |
711 | } | |
712 | ||
88d0db55 | 713 | /* |
090ea126 NTND |
714 | * With an in-core object data in "map", rehash it to make sure the |
715 | * object name actually matches "sha1" to detect object corruption. | |
716 | * With "map" == NULL, try reading the object named with "sha1" using | |
717 | * the streaming interface and rehash it to do the same. | |
88d0db55 | 718 | */ |
090ea126 NTND |
719 | int check_sha1_signature(const unsigned char *sha1, void *map, |
720 | unsigned long size, const char *type) | |
88d0db55 | 721 | { |
0fcfd160 | 722 | unsigned char real_sha1[20]; |
090ea126 NTND |
723 | enum object_type obj_type; |
724 | struct git_istream *st; | |
725 | git_SHA_CTX c; | |
726 | char hdr[32]; | |
727 | int hdrlen; | |
88d0db55 | 728 | |
090ea126 NTND |
729 | if (map) { |
730 | hash_sha1_file(map, size, type, real_sha1); | |
731 | return hashcmp(sha1, real_sha1) ? -1 : 0; | |
88d0db55 BC |
732 | } |
733 | ||
090ea126 NTND |
734 | st = open_istream(sha1, &obj_type, &size, NULL); |
735 | if (!st) | |
736 | return -1; | |
88d0db55 | 737 | |
090ea126 | 738 | /* Generate the header */ |
ef1286d3 | 739 | hdrlen = xsnprintf(hdr, sizeof(hdr), "%s %lu", typename(obj_type), size) + 1; |
88d0db55 | 740 | |
090ea126 NTND |
741 | /* Sha1.. */ |
742 | git_SHA1_Init(&c); | |
743 | git_SHA1_Update(&c, hdr, hdrlen); | |
744 | for (;;) { | |
745 | char buf[1024 * 16]; | |
746 | ssize_t readlen = read_istream(st, buf, sizeof(buf)); | |
1f688557 | 747 | |
f54fac53 JK |
748 | if (readlen < 0) { |
749 | close_istream(st); | |
750 | return -1; | |
751 | } | |
090ea126 NTND |
752 | if (!readlen) |
753 | break; | |
754 | git_SHA1_Update(&c, buf, readlen); | |
fa5fc15d | 755 | } |
090ea126 NTND |
756 | git_SHA1_Final(real_sha1, &c); |
757 | close_istream(st); | |
a89fccd2 | 758 | return hashcmp(sha1, real_sha1) ? -1 : 0; |
fa5fc15d SP |
759 | } |
760 | ||
1b8ac5ea | 761 | int git_open_cloexec(const char *name, int flags) |
a0788266 | 762 | { |
1e3001a8 JH |
763 | int fd; |
764 | static int o_cloexec = O_CLOEXEC; | |
a0788266 | 765 | |
1e3001a8 JH |
766 | fd = open(name, flags | o_cloexec); |
767 | if ((o_cloexec & O_CLOEXEC) && fd < 0 && errno == EINVAL) { | |
cd66ada0 | 768 | /* Try again w/o O_CLOEXEC: the kernel might not support it */ |
1e3001a8 JH |
769 | o_cloexec &= ~O_CLOEXEC; |
770 | fd = open(name, flags | o_cloexec); | |
491a8dec | 771 | } |
491a8dec | 772 | |
9fb9495d | 773 | #if defined(F_GETFD) && defined(F_SETFD) && defined(FD_CLOEXEC) |
491a8dec | 774 | { |
1e3001a8 | 775 | static int fd_cloexec = FD_CLOEXEC; |
a0788266 | 776 | |
1e3001a8 JH |
777 | if (!o_cloexec && 0 <= fd && fd_cloexec) { |
778 | /* Opened w/o O_CLOEXEC? try with fcntl(2) to add it */ | |
9fb9495d EW |
779 | int flags = fcntl(fd, F_GETFD); |
780 | if (fcntl(fd, F_SETFD, flags | fd_cloexec)) | |
1e3001a8 | 781 | fd_cloexec = 0; |
cd66ada0 | 782 | } |
44d1c19e | 783 | } |
a0788266 | 784 | #endif |
1b8ac5ea | 785 | return fd; |
a0788266 JS |
786 | } |
787 | ||
3cf8b462 | 788 | /* |
771e7d57 JK |
789 | * Find "sha1" as a loose object in the local repository or in an alternate. |
790 | * Returns 0 on success, negative on failure. | |
791 | * | |
792 | * The "path" out-parameter will give the path of the object we found (if any). | |
793 | * Note that it may point to static storage and is only valid until another | |
794 | * call to sha1_file_name(), etc. | |
3cf8b462 | 795 | */ |
771e7d57 JK |
796 | static int stat_sha1_file(const unsigned char *sha1, struct stat *st, |
797 | const char **path) | |
1f688557 | 798 | { |
052fe5ea | 799 | struct alternate_object_database *alt; |
d079837e | 800 | |
771e7d57 JK |
801 | *path = sha1_file_name(sha1); |
802 | if (!lstat(*path, st)) | |
052fe5ea | 803 | return 0; |
c7934306 | 804 | |
052fe5ea JK |
805 | prepare_alt_odb(); |
806 | errno = ENOENT; | |
807 | for (alt = alt_odb_list; alt; alt = alt->next) { | |
771e7d57 JK |
808 | *path = alt_sha1_path(alt, sha1); |
809 | if (!lstat(*path, st)) | |
052fe5ea | 810 | return 0; |
c7934306 SP |
811 | } |
812 | ||
3cf8b462 SP |
813 | return -1; |
814 | } | |
815 | ||
771e7d57 JK |
816 | /* |
817 | * Like stat_sha1_file(), but actually open the object and return the | |
818 | * descriptor. See the caveats on the "path" parameter above. | |
819 | */ | |
820 | static int open_sha1_file(const unsigned char *sha1, const char **path) | |
60bb8b14 | 821 | { |
44d1c19e | 822 | int fd; |
44d1c19e | 823 | struct alternate_object_database *alt; |
d6c8a05b | 824 | int most_interesting_errno; |
60bb8b14 | 825 | |
771e7d57 JK |
826 | *path = sha1_file_name(sha1); |
827 | fd = git_open(*path); | |
44d1c19e LT |
828 | if (fd >= 0) |
829 | return fd; | |
d6c8a05b | 830 | most_interesting_errno = errno; |
03e79c88 | 831 | |
44d1c19e | 832 | prepare_alt_odb(); |
44d1c19e | 833 | for (alt = alt_odb_list; alt; alt = alt->next) { |
771e7d57 JK |
834 | *path = alt_sha1_path(alt, sha1); |
835 | fd = git_open(*path); | |
44d1c19e LT |
836 | if (fd >= 0) |
837 | return fd; | |
d6c8a05b JK |
838 | if (most_interesting_errno == ENOENT) |
839 | most_interesting_errno = errno; | |
03e79c88 | 840 | } |
d6c8a05b | 841 | errno = most_interesting_errno; |
44d1c19e | 842 | return -1; |
1f688557 JH |
843 | } |
844 | ||
f6371f92 JK |
845 | /* |
846 | * Map the loose object at "path" if it is not NULL, or the path found by | |
847 | * searching for a loose object named "sha1". | |
848 | */ | |
849 | static void *map_sha1_file_1(const char *path, | |
850 | const unsigned char *sha1, | |
851 | unsigned long *size) | |
27d69a46 | 852 | { |
0fcfd160 | 853 | void *map; |
144bde78 | 854 | int fd; |
84dd81c1 | 855 | |
f6371f92 JK |
856 | if (path) |
857 | fd = git_open(path); | |
8261e1f1 | 858 | else |
f6371f92 | 859 | fd = open_sha1_file(sha1, &path); |
44d1c19e LT |
860 | map = NULL; |
861 | if (fd >= 0) { | |
862 | struct stat st; | |
1f688557 | 863 | |
44d1c19e LT |
864 | if (!fstat(fd, &st)) { |
865 | *size = xsize_t(st.st_size); | |
33e42de0 MM |
866 | if (!*size) { |
867 | /* mmap() is forbidden on empty files */ | |
771e7d57 | 868 | error("object file %s is empty", path); |
33e42de0 MM |
869 | return NULL; |
870 | } | |
44d1c19e | 871 | map = xmmap(NULL, *size, PROT_READ, MAP_PRIVATE, fd, 0); |
144bde78 | 872 | } |
44d1c19e | 873 | close(fd); |
74e34e1f | 874 | } |
0fcfd160 | 875 | return map; |
74e34e1f NP |
876 | } |
877 | ||
f6371f92 | 878 | void *map_sha1_file(const unsigned char *sha1, unsigned long *size) |
068f85e3 | 879 | { |
f6371f92 | 880 | return map_sha1_file_1(NULL, sha1, size); |
068f85e3 | 881 | } |
882 | ||
d21f8426 JH |
883 | static int unpack_sha1_short_header(git_zstream *stream, |
884 | unsigned char *map, unsigned long mapsize, | |
885 | void *buffer, unsigned long bufsiz) | |
47fe3f6e | 886 | { |
c4483576 LT |
887 | /* Get the data stream */ |
888 | memset(stream, 0, sizeof(*stream)); | |
889 | stream->next_in = map; | |
890 | stream->avail_in = mapsize; | |
891 | stream->next_out = buffer; | |
93821bd9 | 892 | stream->avail_out = bufsiz; |
47fe3f6e | 893 | |
39c68542 | 894 | git_inflate_init(stream); |
cc5c54e7 | 895 | return git_inflate(stream, 0); |
9a217f2a JH |
896 | } |
897 | ||
d21f8426 JH |
898 | int unpack_sha1_header(git_zstream *stream, |
899 | unsigned char *map, unsigned long mapsize, | |
900 | void *buffer, unsigned long bufsiz) | |
1f688557 | 901 | { |
d21f8426 JH |
902 | int status = unpack_sha1_short_header(stream, map, mapsize, |
903 | buffer, bufsiz); | |
42873078 | 904 | |
d21f8426 JH |
905 | if (status < Z_OK) |
906 | return status; | |
628522ec | 907 | |
d21f8426 JH |
908 | /* Make sure we have the terminating NUL */ |
909 | if (!memchr(buffer, '\0', stream->next_out - (unsigned char *)buffer)) | |
910 | return -1; | |
1f688557 JH |
911 | return 0; |
912 | } | |
913 | ||
46f03448 KN |
914 | static int unpack_sha1_header_to_strbuf(git_zstream *stream, unsigned char *map, |
915 | unsigned long mapsize, void *buffer, | |
916 | unsigned long bufsiz, struct strbuf *header) | |
d131b7af | 917 | { |
46f03448 KN |
918 | int status; |
919 | ||
d21f8426 JH |
920 | status = unpack_sha1_short_header(stream, map, mapsize, buffer, bufsiz); |
921 | if (status < Z_OK) | |
922 | return -1; | |
d131b7af | 923 | |
46f03448 KN |
924 | /* |
925 | * Check if entire header is unpacked in the first iteration. | |
d131b7af | 926 | */ |
46f03448 KN |
927 | if (memchr(buffer, '\0', stream->next_out - (unsigned char *)buffer)) |
928 | return 0; | |
d131b7af | 929 | |
46f03448 KN |
930 | /* |
931 | * buffer[0..bufsiz] was not large enough. Copy the partial | |
932 | * result out to header, and then append the result of further | |
933 | * reading the stream. | |
934 | */ | |
935 | strbuf_add(header, buffer, stream->next_out - (unsigned char *)buffer); | |
936 | stream->next_out = buffer; | |
937 | stream->avail_out = bufsiz; | |
d131b7af | 938 | |
46f03448 KN |
939 | do { |
940 | status = git_inflate(stream, 0); | |
941 | strbuf_add(header, buffer, stream->next_out - (unsigned char *)buffer); | |
942 | if (memchr(buffer, '\0', stream->next_out - (unsigned char *)buffer)) | |
943 | return 0; | |
944 | stream->next_out = buffer; | |
945 | stream->avail_out = bufsiz; | |
946 | } while (status != Z_STREAM_END); | |
947 | return -1; | |
d131b7af SP |
948 | } |
949 | ||
ef49a7a0 | 950 | static void *unpack_sha1_rest(git_zstream *stream, void *buffer, unsigned long size, const unsigned char *sha1) |
95099731 | 951 | { |
5180cacc | 952 | int bytes = strlen(buffer) + 1; |
3aee68aa | 953 | unsigned char *buf = xmallocz(size); |
93821bd9 | 954 | unsigned long n; |
7efbff75 | 955 | int status = Z_OK; |
95099731 | 956 | |
93821bd9 LT |
957 | n = stream->total_out - bytes; |
958 | if (n > size) | |
959 | n = size; | |
960 | memcpy(buf, (char *) buffer + bytes, n); | |
961 | bytes = n; | |
456cdf6e LT |
962 | if (bytes <= size) { |
963 | /* | |
964 | * The above condition must be (bytes <= size), not | |
965 | * (bytes < size). In other words, even though we | |
ccf5ace0 | 966 | * expect no more output and set avail_out to zero, |
456cdf6e LT |
967 | * the input zlib stream may have bytes that express |
968 | * "this concludes the stream", and we *do* want to | |
969 | * eat that input. | |
970 | * | |
971 | * Otherwise we would not be able to test that we | |
972 | * consumed all the input to reach the expected size; | |
973 | * we also want to check that zlib tells us that all | |
974 | * went well with status == Z_STREAM_END at the end. | |
975 | */ | |
5180cacc LT |
976 | stream->next_out = buf + bytes; |
977 | stream->avail_out = size - bytes; | |
7efbff75 | 978 | while (status == Z_OK) |
39c68542 | 979 | status = git_inflate(stream, Z_FINISH); |
5180cacc | 980 | } |
456cdf6e | 981 | if (status == Z_STREAM_END && !stream->avail_in) { |
39c68542 | 982 | git_inflate_end(stream); |
7efbff75 | 983 | return buf; |
95099731 NTND |
984 | } |
985 | ||
7efbff75 JH |
986 | if (status < 0) |
987 | error("corrupt loose object '%s'", sha1_to_hex(sha1)); | |
988 | else if (stream->avail_in) | |
989 | error("garbage at end of loose object '%s'", | |
990 | sha1_to_hex(sha1)); | |
991 | free(buf); | |
992 | return NULL; | |
95099731 NTND |
993 | } |
994 | ||
d40d535b | 995 | /* |
5180cacc LT |
996 | * We used to just use "sscanf()", but that's actually way |
997 | * too permissive for what we want to check. So do an anal | |
998 | * object header parse by hand. | |
d40d535b | 999 | */ |
46f03448 KN |
1000 | static int parse_sha1_header_extended(const char *hdr, struct object_info *oi, |
1001 | unsigned int flags) | |
1f688557 | 1002 | { |
46f03448 | 1003 | const char *type_buf = hdr; |
5180cacc | 1004 | unsigned long size; |
46f03448 | 1005 | int type, type_len = 0; |
43057304 | 1006 | |
5180cacc | 1007 | /* |
46f03448 | 1008 | * The type can be of any size but is followed by |
21666f1a | 1009 | * a space. |
5180cacc | 1010 | */ |
5180cacc LT |
1011 | for (;;) { |
1012 | char c = *hdr++; | |
d21f8426 JH |
1013 | if (!c) |
1014 | return -1; | |
5180cacc LT |
1015 | if (c == ' ') |
1016 | break; | |
46f03448 | 1017 | type_len++; |
5180cacc | 1018 | } |
1f688557 | 1019 | |
46f03448 KN |
1020 | type = type_from_string_gently(type_buf, type_len, 1); |
1021 | if (oi->typename) | |
1022 | strbuf_add(oi->typename, type_buf, type_len); | |
1023 | /* | |
1024 | * Set type to 0 if its an unknown object and | |
2e3a16b2 | 1025 | * we're obtaining the type using '--allow-unknown-type' |
46f03448 KN |
1026 | * option. |
1027 | */ | |
19fc5e84 | 1028 | if ((flags & OBJECT_INFO_ALLOW_UNKNOWN_TYPE) && (type < 0)) |
46f03448 KN |
1029 | type = 0; |
1030 | else if (type < 0) | |
1031 | die("invalid object type"); | |
1032 | if (oi->typep) | |
1033 | *oi->typep = type; | |
5180cacc LT |
1034 | |
1035 | /* | |
1036 | * The length must follow immediately, and be in canonical | |
1037 | * decimal format (ie "010" is not valid). | |
1038 | */ | |
1039 | size = *hdr++ - '0'; | |
1040 | if (size > 9) | |
1041 | return -1; | |
1042 | if (size) { | |
1043 | for (;;) { | |
1044 | unsigned long c = *hdr - '0'; | |
1045 | if (c > 9) | |
1046 | break; | |
1047 | hdr++; | |
1048 | size = size * 10 + c; | |
1b1005d1 | 1049 | } |
c01f51cc | 1050 | } |
46f03448 KN |
1051 | |
1052 | if (oi->sizep) | |
1053 | *oi->sizep = size; | |
5180cacc LT |
1054 | |
1055 | /* | |
1056 | * The length must be followed by a zero byte | |
1057 | */ | |
46f03448 | 1058 | return *hdr ? -1 : type; |
1f688557 JH |
1059 | } |
1060 | ||
46f03448 | 1061 | int parse_sha1_header(const char *hdr, unsigned long *sizep) |
bf592c50 | 1062 | { |
27b5c1a0 | 1063 | struct object_info oi = OBJECT_INFO_INIT; |
21666f1a | 1064 | |
46f03448 | 1065 | oi.sizep = sizep; |
1f0c0d36 | 1066 | return parse_sha1_header_extended(hdr, &oi, 0); |
bf592c50 DB |
1067 | } |
1068 | ||
052fe5ea | 1069 | static int sha1_loose_object_info(const unsigned char *sha1, |
46f03448 KN |
1070 | struct object_info *oi, |
1071 | int flags) | |
65c2e0c3 | 1072 | { |
46f03448 KN |
1073 | int status = 0; |
1074 | unsigned long mapsize; | |
65c2e0c3 | 1075 | void *map; |
ef49a7a0 | 1076 | git_zstream stream; |
d65a16f6 | 1077 | char hdr[32]; |
46f03448 | 1078 | struct strbuf hdrbuf = STRBUF_INIT; |
c84a1f3e | 1079 | unsigned long size_scratch; |
65c2e0c3 | 1080 | |
5d642e75 JK |
1081 | if (oi->delta_base_sha1) |
1082 | hashclr(oi->delta_base_sha1); | |
1083 | ||
052fe5ea JK |
1084 | /* |
1085 | * If we don't care about type or size, then we don't | |
4ef8d1dd JH |
1086 | * need to look inside the object at all. Note that we |
1087 | * do not optimize out the stat call, even if the | |
1088 | * caller doesn't care about the disk-size, since our | |
1089 | * return value implicitly indicates whether the | |
1090 | * object even exists. | |
052fe5ea | 1091 | */ |
c84a1f3e | 1092 | if (!oi->typep && !oi->typename && !oi->sizep && !oi->contentp) { |
771e7d57 | 1093 | const char *path; |
4ef8d1dd | 1094 | struct stat st; |
771e7d57 | 1095 | if (stat_sha1_file(sha1, &st, &path) < 0) |
4ef8d1dd JH |
1096 | return -1; |
1097 | if (oi->disk_sizep) | |
23c339c0 | 1098 | *oi->disk_sizep = st.st_size; |
052fe5ea JK |
1099 | return 0; |
1100 | } | |
1101 | ||
bb6b8e4f | 1102 | map = map_sha1_file(sha1, &mapsize); |
f0df4ed5 | 1103 | if (!map) |
dbea72a8 | 1104 | return -1; |
c84a1f3e JT |
1105 | |
1106 | if (!oi->sizep) | |
1107 | oi->sizep = &size_scratch; | |
1108 | ||
23c339c0 JK |
1109 | if (oi->disk_sizep) |
1110 | *oi->disk_sizep = mapsize; | |
19fc5e84 | 1111 | if ((flags & OBJECT_INFO_ALLOW_UNKNOWN_TYPE)) { |
46f03448 KN |
1112 | if (unpack_sha1_header_to_strbuf(&stream, map, mapsize, hdr, sizeof(hdr), &hdrbuf) < 0) |
1113 | status = error("unable to unpack %s header with --allow-unknown-type", | |
1114 | sha1_to_hex(sha1)); | |
1115 | } else if (unpack_sha1_header(&stream, map, mapsize, hdr, sizeof(hdr)) < 0) | |
36e4d74a JH |
1116 | status = error("unable to unpack %s header", |
1117 | sha1_to_hex(sha1)); | |
46f03448 KN |
1118 | if (status < 0) |
1119 | ; /* Do nothing */ | |
1120 | else if (hdrbuf.len) { | |
1121 | if ((status = parse_sha1_header_extended(hdrbuf.buf, oi, flags)) < 0) | |
1122 | status = error("unable to parse %s header with --allow-unknown-type", | |
1123 | sha1_to_hex(sha1)); | |
1124 | } else if ((status = parse_sha1_header_extended(hdr, oi, flags)) < 0) | |
36e4d74a | 1125 | status = error("unable to parse %s header", sha1_to_hex(sha1)); |
c84a1f3e JT |
1126 | |
1127 | if (status >= 0 && oi->contentp) | |
1128 | *oi->contentp = unpack_sha1_rest(&stream, hdr, | |
1129 | *oi->sizep, sha1); | |
1130 | else | |
1131 | git_inflate_end(&stream); | |
1132 | ||
65c2e0c3 | 1133 | munmap(map, mapsize); |
46f03448 | 1134 | if (status && oi->typep) |
23c339c0 | 1135 | *oi->typep = status; |
c84a1f3e JT |
1136 | if (oi->sizep == &size_scratch) |
1137 | oi->sizep = NULL; | |
46f03448 | 1138 | strbuf_release(&hdrbuf); |
3ab0fb06 | 1139 | oi->whence = OI_LOOSE; |
93cff9a9 | 1140 | return (status < 0) ? status : 0; |
65c2e0c3 JH |
1141 | } |
1142 | ||
de7b5d62 | 1143 | int sha1_object_info_extended(const unsigned char *sha1, struct object_info *oi, unsigned flags) |
f0df4ed5 | 1144 | { |
cd585e2a | 1145 | static struct object_info blank_oi = OBJECT_INFO_INIT; |
f0df4ed5 | 1146 | struct pack_entry e; |
5b086407 | 1147 | int rtype; |
1f0c0d36 JT |
1148 | const unsigned char *real = (flags & OBJECT_INFO_LOOKUP_REPLACE) ? |
1149 | lookup_replace_object(sha1) : | |
1150 | sha1; | |
f0df4ed5 | 1151 | |
cd585e2a JT |
1152 | if (!oi) |
1153 | oi = &blank_oi; | |
1154 | ||
dfdd4afc JT |
1155 | if (!(flags & OBJECT_INFO_SKIP_CACHED)) { |
1156 | struct cached_object *co = find_cached_object(real); | |
1157 | if (co) { | |
1158 | if (oi->typep) | |
1159 | *(oi->typep) = co->type; | |
1160 | if (oi->sizep) | |
1161 | *(oi->sizep) = co->size; | |
1162 | if (oi->disk_sizep) | |
1163 | *(oi->disk_sizep) = 0; | |
1164 | if (oi->delta_base_sha1) | |
1165 | hashclr(oi->delta_base_sha1); | |
1166 | if (oi->typename) | |
1167 | strbuf_addstr(oi->typename, typename(co->type)); | |
1168 | if (oi->contentp) | |
1169 | *oi->contentp = xmemdupz(co->buf, co->size); | |
1170 | oi->whence = OI_CACHED; | |
1171 | return 0; | |
1172 | } | |
c4d9986f NTND |
1173 | } |
1174 | ||
1f7117ef | 1175 | if (!find_pack_entry(real, &e)) { |
ddd63e64 | 1176 | /* Most likely it's a loose object. */ |
3ab0fb06 | 1177 | if (!sha1_loose_object_info(real, oi, flags)) |
5b086407 | 1178 | return 0; |
ddd63e64 SG |
1179 | |
1180 | /* Not a loose object; someone else may have just packed it. */ | |
dfdd4afc | 1181 | if (flags & OBJECT_INFO_QUICK) { |
052fe5ea | 1182 | return -1; |
dfdd4afc JT |
1183 | } else { |
1184 | reprepare_packed_git(); | |
1185 | if (!find_pack_entry(real, &e)) | |
1186 | return -1; | |
1187 | } | |
f0df4ed5 | 1188 | } |
3d77d877 | 1189 | |
cd585e2a JT |
1190 | if (oi == &blank_oi) |
1191 | /* | |
1192 | * We know that the caller doesn't actually need the | |
1193 | * information below, so return early. | |
1194 | */ | |
1195 | return 0; | |
46f03448 | 1196 | |
23c339c0 | 1197 | rtype = packed_object_info(e.p, e.offset, oi); |
412916ee | 1198 | if (rtype < 0) { |
1f7117ef CC |
1199 | mark_bad_packed_object(e.p, real); |
1200 | return sha1_object_info_extended(real, oi, 0); | |
3ab0fb06 | 1201 | } else if (oi->whence == OI_PACKED) { |
9a490590 JH |
1202 | oi->u.packed.offset = e.offset; |
1203 | oi->u.packed.pack = e.p; | |
1204 | oi->u.packed.is_delta = (rtype == OBJ_REF_DELTA || | |
1205 | rtype == OBJ_OFS_DELTA); | |
3d77d877 NP |
1206 | } |
1207 | ||
5b086407 | 1208 | return 0; |
f0df4ed5 JS |
1209 | } |
1210 | ||
3fc0dca9 | 1211 | /* returns enum object_type or negative */ |
9a490590 JH |
1212 | int sha1_object_info(const unsigned char *sha1, unsigned long *sizep) |
1213 | { | |
5b086407 | 1214 | enum object_type type; |
27b5c1a0 | 1215 | struct object_info oi = OBJECT_INFO_INIT; |
9a490590 | 1216 | |
5b086407 | 1217 | oi.typep = &type; |
9a490590 | 1218 | oi.sizep = sizep; |
1f0c0d36 JT |
1219 | if (sha1_object_info_extended(sha1, &oi, |
1220 | OBJECT_INFO_LOOKUP_REPLACE) < 0) | |
5b086407 JK |
1221 | return -1; |
1222 | return type; | |
9a490590 JH |
1223 | } |
1224 | ||
f1d8130b JT |
1225 | static void *read_object(const unsigned char *sha1, enum object_type *type, |
1226 | unsigned long *size) | |
1227 | { | |
1228 | struct object_info oi = OBJECT_INFO_INIT; | |
1229 | void *content; | |
1230 | oi.typep = type; | |
1231 | oi.sizep = size; | |
1232 | oi.contentp = &content; | |
1233 | ||
1234 | if (sha1_object_info_extended(sha1, &oi, 0) < 0) | |
1235 | return NULL; | |
1236 | return content; | |
1237 | } | |
1238 | ||
21666f1a NP |
1239 | int pretend_sha1_file(void *buf, unsigned long len, enum object_type type, |
1240 | unsigned char *sha1) | |
d66b37bb JH |
1241 | { |
1242 | struct cached_object *co; | |
1243 | ||
21666f1a | 1244 | hash_sha1_file(buf, len, typename(type), sha1); |
d66b37bb JH |
1245 | if (has_sha1_file(sha1) || find_cached_object(sha1)) |
1246 | return 0; | |
c7353967 | 1247 | ALLOC_GROW(cached_objects, cached_object_nr + 1, cached_object_alloc); |
d66b37bb JH |
1248 | co = &cached_objects[cached_object_nr++]; |
1249 | co->size = len; | |
21666f1a | 1250 | co->type = type; |
efa13f7b JH |
1251 | co->buf = xmalloc(len); |
1252 | memcpy(co->buf, buf, len); | |
d66b37bb JH |
1253 | hashcpy(co->sha1, sha1); |
1254 | return 0; | |
1255 | } | |
1256 | ||
b6c4cecc JH |
1257 | /* |
1258 | * This function dies on corrupt objects; the callers who want to | |
1259 | * deal with them should arrange to call read_object() and give error | |
1260 | * messages themselves. | |
1261 | */ | |
5bf29b95 JH |
1262 | void *read_sha1_file_extended(const unsigned char *sha1, |
1263 | enum object_type *type, | |
1264 | unsigned long *size, | |
1f0c0d36 | 1265 | int lookup_replace) |
ac939109 | 1266 | { |
3ba7a065 | 1267 | void *data; |
b6c4cecc | 1268 | const struct packed_git *p; |
771e7d57 JK |
1269 | const char *path; |
1270 | struct stat st; | |
1f0c0d36 JT |
1271 | const unsigned char *repl = lookup_replace ? lookup_replace_object(sha1) |
1272 | : sha1; | |
b6c4cecc | 1273 | |
3ba7a065 JH |
1274 | errno = 0; |
1275 | data = read_object(repl, type, size); | |
4bbf5a26 | 1276 | if (data) |
b6c4cecc | 1277 | return data; |
68095570 | 1278 | |
25f3af3f | 1279 | if (errno && errno != ENOENT) |
3ba7a065 JH |
1280 | die_errno("failed to read object %s", sha1_to_hex(sha1)); |
1281 | ||
68095570 | 1282 | /* die if we replaced an object with one that does not exist */ |
b6c4cecc | 1283 | if (repl != sha1) |
68095570 CC |
1284 | die("replacement %s not found for %s", |
1285 | sha1_to_hex(repl), sha1_to_hex(sha1)); | |
1286 | ||
771e7d57 | 1287 | if (!stat_sha1_file(repl, &st, &path)) |
b6c4cecc JH |
1288 | die("loose object %s (stored in %s) is corrupt", |
1289 | sha1_to_hex(repl), path); | |
68095570 | 1290 | |
b6c4cecc JH |
1291 | if ((p = has_packed_and_bad(repl)) != NULL) |
1292 | die("packed object %s (stored in %s) is corrupt", | |
1293 | sha1_to_hex(repl), p->pack_name); | |
f5552aee | 1294 | |
b6c4cecc | 1295 | return NULL; |
ac939109 NP |
1296 | } |
1297 | ||
40469ee9 | 1298 | void *read_object_with_reference(const unsigned char *sha1, |
21666f1a | 1299 | const char *required_type_name, |
40469ee9 JH |
1300 | unsigned long *size, |
1301 | unsigned char *actual_sha1_return) | |
f4913f91 | 1302 | { |
21666f1a | 1303 | enum object_type type, required_type; |
f4913f91 JH |
1304 | void *buffer; |
1305 | unsigned long isize; | |
40469ee9 | 1306 | unsigned char actual_sha1[20]; |
f4913f91 | 1307 | |
21666f1a | 1308 | required_type = type_from_string(required_type_name); |
e702496e | 1309 | hashcpy(actual_sha1, sha1); |
40469ee9 JH |
1310 | while (1) { |
1311 | int ref_length = -1; | |
1312 | const char *ref_type = NULL; | |
f4913f91 | 1313 | |
21666f1a | 1314 | buffer = read_sha1_file(actual_sha1, &type, &isize); |
40469ee9 JH |
1315 | if (!buffer) |
1316 | return NULL; | |
21666f1a | 1317 | if (type == required_type) { |
40469ee9 JH |
1318 | *size = isize; |
1319 | if (actual_sha1_return) | |
e702496e | 1320 | hashcpy(actual_sha1_return, actual_sha1); |
40469ee9 JH |
1321 | return buffer; |
1322 | } | |
1323 | /* Handle references */ | |
21666f1a | 1324 | else if (type == OBJ_COMMIT) |
40469ee9 | 1325 | ref_type = "tree "; |
21666f1a | 1326 | else if (type == OBJ_TAG) |
40469ee9 JH |
1327 | ref_type = "object "; |
1328 | else { | |
1329 | free(buffer); | |
1330 | return NULL; | |
1331 | } | |
1332 | ref_length = strlen(ref_type); | |
f4913f91 | 1333 | |
50974ec9 MK |
1334 | if (ref_length + 40 > isize || |
1335 | memcmp(buffer, ref_type, ref_length) || | |
1d7f171c | 1336 | get_sha1_hex((char *) buffer + ref_length, actual_sha1)) { |
40469ee9 JH |
1337 | free(buffer); |
1338 | return NULL; | |
1339 | } | |
1cf58e72 | 1340 | free(buffer); |
40469ee9 JH |
1341 | /* Now we have the ID of the referred-to object in |
1342 | * actual_sha1. Check again. */ | |
f4913f91 | 1343 | } |
f4913f91 JH |
1344 | } |
1345 | ||
ce9fbf16 | 1346 | static void write_sha1_file_prepare(const void *buf, unsigned long len, |
972a9155 | 1347 | const char *type, unsigned char *sha1, |
d65a16f6 | 1348 | char *hdr, int *hdrlen) |
d410c0f5 | 1349 | { |
9126f009 | 1350 | git_SHA_CTX c; |
d410c0f5 JH |
1351 | |
1352 | /* Generate the header */ | |
ef1286d3 | 1353 | *hdrlen = xsnprintf(hdr, *hdrlen, "%s %lu", type, len)+1; |
d410c0f5 JH |
1354 | |
1355 | /* Sha1.. */ | |
9126f009 NP |
1356 | git_SHA1_Init(&c); |
1357 | git_SHA1_Update(&c, hdr, *hdrlen); | |
1358 | git_SHA1_Update(&c, buf, len); | |
1359 | git_SHA1_Final(sha1, &c); | |
d410c0f5 JH |
1360 | } |
1361 | ||
230f1322 | 1362 | /* |
5a688fe4 | 1363 | * Move the just written object into its final resting place. |
230f1322 | 1364 | */ |
cb5add58 | 1365 | int finalize_object_file(const char *tmpfile, const char *filename) |
230f1322 | 1366 | { |
e32c0a9c | 1367 | int ret = 0; |
5a688fe4 | 1368 | |
348df166 | 1369 | if (object_creation_mode == OBJECT_CREATION_USES_RENAMES) |
be66a6c4 JS |
1370 | goto try_rename; |
1371 | else if (link(tmpfile, filename)) | |
e32c0a9c | 1372 | ret = errno; |
7ebb6fca LT |
1373 | |
1374 | /* | |
1375 | * Coda hack - coda doesn't like cross-directory links, | |
1376 | * so we fall back to a rename, which will mean that it | |
1377 | * won't be able to check collisions, but that's not a | |
1378 | * big deal. | |
1379 | * | |
1380 | * The same holds for FAT formatted media. | |
1381 | * | |
3be1f18e | 1382 | * When this succeeds, we just return. We have nothing |
7ebb6fca LT |
1383 | * left to unlink. |
1384 | */ | |
1385 | if (ret && ret != EEXIST) { | |
be66a6c4 | 1386 | try_rename: |
7ebb6fca | 1387 | if (!rename(tmpfile, filename)) |
3be1f18e | 1388 | goto out; |
9e48b389 | 1389 | ret = errno; |
230f1322 | 1390 | } |
691f1a28 | 1391 | unlink_or_warn(tmpfile); |
230f1322 LT |
1392 | if (ret) { |
1393 | if (ret != EEXIST) { | |
7616c6ca | 1394 | return error_errno("unable to write sha1 filename %s", filename); |
230f1322 LT |
1395 | } |
1396 | /* FIXME!!! Collision check here ? */ | |
1397 | } | |
1398 | ||
3be1f18e | 1399 | out: |
5256b006 | 1400 | if (adjust_shared_perm(filename)) |
5a688fe4 | 1401 | return error("unable to set permission to '%s'", filename); |
230f1322 LT |
1402 | return 0; |
1403 | } | |
1404 | ||
4d548150 LT |
1405 | static int write_buffer(int fd, const void *buf, size_t len) |
1406 | { | |
d34cf19b | 1407 | if (write_in_full(fd, buf, len) < 0) |
7616c6ca | 1408 | return error_errno("file write error"); |
4d548150 LT |
1409 | return 0; |
1410 | } | |
1411 | ||
ce9fbf16 | 1412 | int hash_sha1_file(const void *buf, unsigned long len, const char *type, |
abdc3fc8 RS |
1413 | unsigned char *sha1) |
1414 | { | |
d65a16f6 | 1415 | char hdr[32]; |
ef1286d3 | 1416 | int hdrlen = sizeof(hdr); |
abdc3fc8 RS |
1417 | write_sha1_file_prepare(buf, len, type, sha1, hdr, &hdrlen); |
1418 | return 0; | |
1419 | } | |
1420 | ||
e9039dd3 LT |
1421 | /* Finalize a file on disk, and close it. */ |
1422 | static void close_sha1_file(int fd) | |
1423 | { | |
aafe9fba LT |
1424 | if (fsync_object_files) |
1425 | fsync_or_die(fd, "sha1 file"); | |
e9039dd3 | 1426 | if (close(fd) != 0) |
d824cbba | 1427 | die_errno("error when closing sha1 file"); |
e9039dd3 LT |
1428 | } |
1429 | ||
5723fe7e LT |
1430 | /* Size of directory component, including the ending '/' */ |
1431 | static inline int directory_size(const char *filename) | |
1432 | { | |
1433 | const char *s = strrchr(filename, '/'); | |
1434 | if (!s) | |
1435 | return 0; | |
1436 | return s - filename + 1; | |
1437 | } | |
1438 | ||
1439 | /* | |
1440 | * This creates a temporary file in the same directory as the final | |
1441 | * 'filename' | |
1442 | * | |
1443 | * We want to avoid cross-directory filename renames, because those | |
1444 | * can have problems on various filesystems (FAT, NFS, Coda). | |
1445 | */ | |
d4b3d11a | 1446 | static int create_tmpfile(struct strbuf *tmp, const char *filename) |
5723fe7e LT |
1447 | { |
1448 | int fd, dirlen = directory_size(filename); | |
1449 | ||
d4b3d11a JK |
1450 | strbuf_reset(tmp); |
1451 | strbuf_add(tmp, filename, dirlen); | |
1452 | strbuf_addstr(tmp, "tmp_obj_XXXXXX"); | |
1453 | fd = git_mkstemp_mode(tmp->buf, 0444); | |
cbacbf4e | 1454 | if (fd < 0 && dirlen && errno == ENOENT) { |
d4b3d11a JK |
1455 | /* |
1456 | * Make sure the directory exists; note that the contents | |
1457 | * of the buffer are undefined after mkstemp returns an | |
1458 | * error, so we have to rewrite the whole buffer from | |
1459 | * scratch. | |
1460 | */ | |
1461 | strbuf_reset(tmp); | |
1462 | strbuf_add(tmp, filename, dirlen - 1); | |
1463 | if (mkdir(tmp->buf, 0777) && errno != EEXIST) | |
b2476a60 | 1464 | return -1; |
d4b3d11a | 1465 | if (adjust_shared_perm(tmp->buf)) |
5723fe7e LT |
1466 | return -1; |
1467 | ||
1468 | /* Try again */ | |
d4b3d11a JK |
1469 | strbuf_addstr(tmp, "/tmp_obj_XXXXXX"); |
1470 | fd = git_mkstemp_mode(tmp->buf, 0444); | |
5723fe7e LT |
1471 | } |
1472 | return fd; | |
1473 | } | |
1474 | ||
bbac7311 | 1475 | static int write_loose_object(const unsigned char *sha1, char *hdr, int hdrlen, |
c00e657d | 1476 | const void *buf, unsigned long len, time_t mtime) |
0fcfd160 | 1477 | { |
915308b1 | 1478 | int fd, ret; |
9892beba | 1479 | unsigned char compressed[4096]; |
ef49a7a0 | 1480 | git_zstream stream; |
748af44c NP |
1481 | git_SHA_CTX c; |
1482 | unsigned char parano_sha1[20]; | |
d4b3d11a | 1483 | static struct strbuf tmp_file = STRBUF_INIT; |
30d6c6ea | 1484 | const char *filename = sha1_file_name(sha1); |
a44c9a5e | 1485 | |
d4b3d11a | 1486 | fd = create_tmpfile(&tmp_file, filename); |
aac17941 | 1487 | if (fd < 0) { |
35243577 | 1488 | if (errno == EACCES) |
82247e9b | 1489 | return error("insufficient permission for adding an object to repository database %s", get_object_directory()); |
916d081b | 1490 | else |
7616c6ca | 1491 | return error_errno("unable to create temporary file"); |
aac17941 LT |
1492 | } |
1493 | ||
0fcfd160 | 1494 | /* Set it up */ |
55bb5c91 | 1495 | git_deflate_init(&stream, zlib_compression_level); |
0fcfd160 | 1496 | stream.next_out = compressed; |
9892beba | 1497 | stream.avail_out = sizeof(compressed); |
748af44c | 1498 | git_SHA1_Init(&c); |
a44c9a5e LT |
1499 | |
1500 | /* First header.. */ | |
d65a16f6 | 1501 | stream.next_in = (unsigned char *)hdr; |
a44c9a5e | 1502 | stream.avail_in = hdrlen; |
55bb5c91 JH |
1503 | while (git_deflate(&stream, 0) == Z_OK) |
1504 | ; /* nothing */ | |
748af44c | 1505 | git_SHA1_Update(&c, hdr, hdrlen); |
a44c9a5e LT |
1506 | |
1507 | /* Then the data itself.. */ | |
c00e657d | 1508 | stream.next_in = (void *)buf; |
a44c9a5e | 1509 | stream.avail_in = len; |
9892beba | 1510 | do { |
748af44c | 1511 | unsigned char *in0 = stream.next_in; |
55bb5c91 | 1512 | ret = git_deflate(&stream, Z_FINISH); |
748af44c | 1513 | git_SHA1_Update(&c, in0, stream.next_in - in0); |
9892beba NP |
1514 | if (write_buffer(fd, compressed, stream.next_out - compressed) < 0) |
1515 | die("unable to write sha1 file"); | |
1516 | stream.next_out = compressed; | |
1517 | stream.avail_out = sizeof(compressed); | |
1518 | } while (ret == Z_OK); | |
1519 | ||
ac54c277 LT |
1520 | if (ret != Z_STREAM_END) |
1521 | die("unable to deflate new object %s (%d)", sha1_to_hex(sha1), ret); | |
55bb5c91 | 1522 | ret = git_deflate_end_gently(&stream); |
ac54c277 LT |
1523 | if (ret != Z_OK) |
1524 | die("deflateEnd on object %s failed (%d)", sha1_to_hex(sha1), ret); | |
748af44c NP |
1525 | git_SHA1_Final(parano_sha1, &c); |
1526 | if (hashcmp(sha1, parano_sha1) != 0) | |
1527 | die("confused by unstable object source data for %s", sha1_to_hex(sha1)); | |
ac54c277 | 1528 | |
e9039dd3 | 1529 | close_sha1_file(fd); |
0fcfd160 | 1530 | |
bbac7311 NP |
1531 | if (mtime) { |
1532 | struct utimbuf utb; | |
1533 | utb.actime = mtime; | |
1534 | utb.modtime = mtime; | |
d4b3d11a | 1535 | if (utime(tmp_file.buf, &utb) < 0) |
7616c6ca | 1536 | warning_errno("failed utime() on %s", tmp_file.buf); |
bbac7311 NP |
1537 | } |
1538 | ||
d4b3d11a | 1539 | return finalize_object_file(tmp_file.buf, filename); |
0fcfd160 | 1540 | } |
8237b185 | 1541 | |
33d4221c JK |
1542 | static int freshen_loose_object(const unsigned char *sha1) |
1543 | { | |
1544 | return check_and_freshen(sha1, 1); | |
1545 | } | |
1546 | ||
1547 | static int freshen_packed_object(const unsigned char *sha1) | |
1548 | { | |
1549 | struct pack_entry e; | |
ee1c6c34 JK |
1550 | if (!find_pack_entry(sha1, &e)) |
1551 | return 0; | |
1552 | if (e.p->freshened) | |
1553 | return 1; | |
1554 | if (!freshen_file(e.p->pack_name)) | |
1555 | return 0; | |
1556 | e.p->freshened = 1; | |
1557 | return 1; | |
33d4221c JK |
1558 | } |
1559 | ||
1427a7ff | 1560 | int write_sha1_file(const void *buf, unsigned long len, const char *type, unsigned char *sha1) |
bbac7311 | 1561 | { |
bbac7311 | 1562 | char hdr[32]; |
ef1286d3 | 1563 | int hdrlen = sizeof(hdr); |
bbac7311 NP |
1564 | |
1565 | /* Normally if we have it in the pack then we do not bother writing | |
1566 | * it out into .git/objects/??/?{38} file. | |
1567 | */ | |
1568 | write_sha1_file_prepare(buf, len, type, sha1, hdr, &hdrlen); | |
b5f52f37 | 1569 | if (freshen_packed_object(sha1) || freshen_loose_object(sha1)) |
bbac7311 NP |
1570 | return 0; |
1571 | return write_loose_object(sha1, hdr, hdrlen, buf, len, 0); | |
1572 | } | |
1573 | ||
0c3db67c | 1574 | int hash_sha1_file_literally(const void *buf, unsigned long len, const char *type, |
da77611d | 1575 | struct object_id *oid, unsigned flags) |
0c3db67c ES |
1576 | { |
1577 | char *header; | |
1578 | int hdrlen, status = 0; | |
1579 | ||
1580 | /* type string, SP, %lu of the length plus NUL must fit this */ | |
ef1286d3 JK |
1581 | hdrlen = strlen(type) + 32; |
1582 | header = xmalloc(hdrlen); | |
da77611d | 1583 | write_sha1_file_prepare(buf, len, type, oid->hash, header, &hdrlen); |
0c3db67c ES |
1584 | |
1585 | if (!(flags & HASH_WRITE_OBJECT)) | |
1586 | goto cleanup; | |
da77611d | 1587 | if (freshen_packed_object(oid->hash) || freshen_loose_object(oid->hash)) |
0c3db67c | 1588 | goto cleanup; |
da77611d | 1589 | status = write_loose_object(oid->hash, header, hdrlen, buf, len, 0); |
0c3db67c ES |
1590 | |
1591 | cleanup: | |
1592 | free(header); | |
1593 | return status; | |
1594 | } | |
1595 | ||
bbac7311 NP |
1596 | int force_object_loose(const unsigned char *sha1, time_t mtime) |
1597 | { | |
bbac7311 NP |
1598 | void *buf; |
1599 | unsigned long len; | |
1600 | enum object_type type; | |
1601 | char hdr[32]; | |
1602 | int hdrlen; | |
1fb23e65 | 1603 | int ret; |
bbac7311 | 1604 | |
c529d75a | 1605 | if (has_loose_object(sha1)) |
bbac7311 | 1606 | return 0; |
789bf26b | 1607 | buf = read_object(sha1, &type, &len); |
bbac7311 NP |
1608 | if (!buf) |
1609 | return error("cannot read sha1_file for %s", sha1_to_hex(sha1)); | |
ef1286d3 | 1610 | hdrlen = xsnprintf(hdr, sizeof(hdr), "%s %lu", typename(type), len) + 1; |
1fb23e65 BS |
1611 | ret = write_loose_object(sha1, hdr, hdrlen, buf, len, mtime); |
1612 | free(buf); | |
1613 | ||
1614 | return ret; | |
bbac7311 NP |
1615 | } |
1616 | ||
0eeb077b | 1617 | int has_sha1_file_with_flags(const unsigned char *sha1, int flags) |
8237b185 | 1618 | { |
3e8b7d3c JN |
1619 | if (!startup_info->have_repository) |
1620 | return 0; | |
e83e71c5 JT |
1621 | return sha1_object_info_extended(sha1, NULL, |
1622 | flags | OBJECT_INFO_SKIP_CACHED) >= 0; | |
b419aa25 | 1623 | } |
1624 | ||
1625 | int has_object_file(const struct object_id *oid) | |
1626 | { | |
1627 | return has_sha1_file(oid->hash); | |
8237b185 | 1628 | } |
74400e71 | 1629 | |
5827a035 JK |
1630 | int has_object_file_with_flags(const struct object_id *oid, int flags) |
1631 | { | |
1632 | return has_sha1_file_with_flags(oid->hash, flags); | |
1633 | } | |
1634 | ||
c879daa2 NTND |
1635 | static void check_tree(const void *buf, size_t size) |
1636 | { | |
1637 | struct tree_desc desc; | |
1638 | struct name_entry entry; | |
1639 | ||
1640 | init_tree_desc(&desc, buf, size); | |
1641 | while (tree_entry(&desc, &entry)) | |
1642 | /* do nothing | |
1643 | * tree_entry() will die() on malformed entries */ | |
1644 | ; | |
1645 | } | |
1646 | ||
1647 | static void check_commit(const void *buf, size_t size) | |
1648 | { | |
1649 | struct commit c; | |
1650 | memset(&c, 0, sizeof(c)); | |
1651 | if (parse_commit_buffer(&c, buf, size)) | |
1652 | die("corrupt commit"); | |
1653 | } | |
1654 | ||
1655 | static void check_tag(const void *buf, size_t size) | |
1656 | { | |
1657 | struct tag t; | |
1658 | memset(&t, 0, sizeof(t)); | |
1659 | if (parse_tag_buffer(&t, buf, size)) | |
1660 | die("corrupt tag"); | |
1661 | } | |
1662 | ||
43df4f86 | 1663 | static int index_mem(unsigned char *sha1, void *buf, size_t size, |
c4ce46fc JH |
1664 | enum object_type type, |
1665 | const char *path, unsigned flags) | |
e7332f96 | 1666 | { |
6c510bee | 1667 | int ret, re_allocated = 0; |
c4ce46fc | 1668 | int write_object = flags & HASH_WRITE_OBJECT; |
74400e71 | 1669 | |
7672db20 | 1670 | if (!type) |
edaec3fb | 1671 | type = OBJ_BLOB; |
6c510bee LT |
1672 | |
1673 | /* | |
1674 | * Convert blobs to git internal format | |
1675 | */ | |
43df4f86 | 1676 | if ((type == OBJ_BLOB) && path) { |
f285a2d7 | 1677 | struct strbuf nbuf = STRBUF_INIT; |
82b474e0 | 1678 | if (convert_to_git(&the_index, path, buf, size, &nbuf, |
5e12e78e | 1679 | write_object ? safe_crlf : SAFE_CRLF_FALSE)) { |
b315c5c0 | 1680 | buf = strbuf_detach(&nbuf, &size); |
6c510bee LT |
1681 | re_allocated = 1; |
1682 | } | |
1683 | } | |
c4ce46fc | 1684 | if (flags & HASH_FORMAT_CHECK) { |
c879daa2 NTND |
1685 | if (type == OBJ_TREE) |
1686 | check_tree(buf, size); | |
1687 | if (type == OBJ_COMMIT) | |
1688 | check_commit(buf, size); | |
1689 | if (type == OBJ_TAG) | |
1690 | check_tag(buf, size); | |
1691 | } | |
6c510bee | 1692 | |
7672db20 | 1693 | if (write_object) |
edaec3fb | 1694 | ret = write_sha1_file(buf, size, typename(type), sha1); |
abdc3fc8 | 1695 | else |
edaec3fb | 1696 | ret = hash_sha1_file(buf, size, typename(type), sha1); |
43df4f86 | 1697 | if (re_allocated) |
6c510bee | 1698 | free(buf); |
43df4f86 DP |
1699 | return ret; |
1700 | } | |
1701 | ||
9035d75a SP |
1702 | static int index_stream_convert_blob(unsigned char *sha1, int fd, |
1703 | const char *path, unsigned flags) | |
1704 | { | |
1705 | int ret; | |
1706 | const int write_object = flags & HASH_WRITE_OBJECT; | |
1707 | struct strbuf sbuf = STRBUF_INIT; | |
1708 | ||
1709 | assert(path); | |
1710 | assert(would_convert_to_git_filter_fd(path)); | |
1711 | ||
d6c41c20 | 1712 | convert_to_git_filter_fd(&the_index, path, fd, &sbuf, |
9035d75a SP |
1713 | write_object ? safe_crlf : SAFE_CRLF_FALSE); |
1714 | ||
1715 | if (write_object) | |
1716 | ret = write_sha1_file(sbuf.buf, sbuf.len, typename(OBJ_BLOB), | |
1717 | sha1); | |
1718 | else | |
1719 | ret = hash_sha1_file(sbuf.buf, sbuf.len, typename(OBJ_BLOB), | |
1720 | sha1); | |
1721 | strbuf_release(&sbuf); | |
1722 | return ret; | |
1723 | } | |
1724 | ||
7b41e1e1 JH |
1725 | static int index_pipe(unsigned char *sha1, int fd, enum object_type type, |
1726 | const char *path, unsigned flags) | |
1727 | { | |
1728 | struct strbuf sbuf = STRBUF_INIT; | |
1729 | int ret; | |
1730 | ||
1731 | if (strbuf_read(&sbuf, fd, 4096) >= 0) | |
1732 | ret = index_mem(sha1, sbuf.buf, sbuf.len, type, path, flags); | |
1733 | else | |
1734 | ret = -1; | |
1735 | strbuf_release(&sbuf); | |
1736 | return ret; | |
1737 | } | |
1738 | ||
ea68b0ce DP |
1739 | #define SMALL_FILE_SIZE (32*1024) |
1740 | ||
7b41e1e1 JH |
1741 | static int index_core(unsigned char *sha1, int fd, size_t size, |
1742 | enum object_type type, const char *path, | |
1743 | unsigned flags) | |
43df4f86 DP |
1744 | { |
1745 | int ret; | |
43df4f86 | 1746 | |
7b41e1e1 | 1747 | if (!size) { |
f6a1e1e2 | 1748 | ret = index_mem(sha1, "", size, type, path, flags); |
ea68b0ce DP |
1749 | } else if (size <= SMALL_FILE_SIZE) { |
1750 | char *buf = xmalloc(size); | |
90dca671 JK |
1751 | ssize_t read_result = read_in_full(fd, buf, size); |
1752 | if (read_result < 0) | |
1753 | ret = error_errno("read error while indexing %s", | |
1754 | path ? path : "<unknown>"); | |
1755 | else if (read_result != size) | |
1756 | ret = error("short read while indexing %s", | |
1757 | path ? path : "<unknown>"); | |
ea68b0ce | 1758 | else |
90dca671 | 1759 | ret = index_mem(sha1, buf, size, type, path, flags); |
ea68b0ce | 1760 | free(buf); |
08bda208 | 1761 | } else { |
43df4f86 | 1762 | void *buf = xmmap(NULL, size, PROT_READ, MAP_PRIVATE, fd, 0); |
c4ce46fc | 1763 | ret = index_mem(sha1, buf, size, type, path, flags); |
aac17941 | 1764 | munmap(buf, size); |
08bda208 | 1765 | } |
7b41e1e1 JH |
1766 | return ret; |
1767 | } | |
1768 | ||
4dd1fbc7 | 1769 | /* |
568508e7 JH |
1770 | * This creates one packfile per large blob unless bulk-checkin |
1771 | * machinery is "plugged". | |
4dd1fbc7 JH |
1772 | * |
1773 | * This also bypasses the usual "convert-to-git" dance, and that is on | |
1774 | * purpose. We could write a streaming version of the converting | |
1775 | * functions and insert that before feeding the data to fast-import | |
4f22b101 JK |
1776 | * (or equivalent in-core API described above). However, that is |
1777 | * somewhat complicated, as we do not know the size of the filter | |
1778 | * result, which we need to know beforehand when writing a git object. | |
1779 | * Since the primary motivation for trying to stream from the working | |
1780 | * tree file and to avoid mmaping it in core is to deal with large | |
1781 | * binary blobs, they generally do not want to get any conversion, and | |
1782 | * callers should avoid this code path when filters are requested. | |
4dd1fbc7 | 1783 | */ |
7d5e1dc3 | 1784 | static int index_stream(struct object_id *oid, int fd, size_t size, |
4dd1fbc7 JH |
1785 | enum object_type type, const char *path, |
1786 | unsigned flags) | |
1787 | { | |
7d5e1dc3 | 1788 | return index_bulk_checkin(oid->hash, fd, size, type, path, flags); |
4dd1fbc7 JH |
1789 | } |
1790 | ||
e3506559 | 1791 | int index_fd(struct object_id *oid, int fd, struct stat *st, |
7b41e1e1 JH |
1792 | enum object_type type, const char *path, unsigned flags) |
1793 | { | |
1794 | int ret; | |
7b41e1e1 | 1795 | |
9079ab7c SP |
1796 | /* |
1797 | * Call xsize_t() only when needed to avoid potentially unnecessary | |
1798 | * die() for large files. | |
1799 | */ | |
9035d75a | 1800 | if (type == OBJ_BLOB && path && would_convert_to_git_filter_fd(path)) |
e3506559 | 1801 | ret = index_stream_convert_blob(oid->hash, fd, path, flags); |
9035d75a | 1802 | else if (!S_ISREG(st->st_mode)) |
e3506559 | 1803 | ret = index_pipe(oid->hash, fd, type, path, flags); |
9079ab7c | 1804 | else if (st->st_size <= big_file_threshold || type != OBJ_BLOB || |
82b474e0 | 1805 | (path && would_convert_to_git(&the_index, path))) |
e3506559 | 1806 | ret = index_core(oid->hash, fd, xsize_t(st->st_size), type, path, |
9079ab7c | 1807 | flags); |
4dd1fbc7 | 1808 | else |
7d5e1dc3 | 1809 | ret = index_stream(oid, fd, xsize_t(st->st_size), type, path, |
9079ab7c | 1810 | flags); |
43df4f86 | 1811 | close(fd); |
aac17941 | 1812 | return ret; |
74400e71 | 1813 | } |
ec1fcc16 | 1814 | |
98e019b0 | 1815 | int index_path(struct object_id *oid, const char *path, struct stat *st, unsigned flags) |
ec1fcc16 JH |
1816 | { |
1817 | int fd; | |
b760d3aa | 1818 | struct strbuf sb = STRBUF_INIT; |
ea8e0297 | 1819 | int rc = 0; |
ec1fcc16 JH |
1820 | |
1821 | switch (st->st_mode & S_IFMT) { | |
1822 | case S_IFREG: | |
1823 | fd = open(path, O_RDONLY); | |
1824 | if (fd < 0) | |
7616c6ca | 1825 | return error_errno("open(\"%s\")", path); |
e3506559 | 1826 | if (index_fd(oid, fd, st, OBJ_BLOB, path, flags) < 0) |
ec1fcc16 JH |
1827 | return error("%s: failed to insert into database", |
1828 | path); | |
1829 | break; | |
1830 | case S_IFLNK: | |
7616c6ca NTND |
1831 | if (strbuf_readlink(&sb, path, st->st_size)) |
1832 | return error_errno("readlink(\"%s\")", path); | |
c4ce46fc | 1833 | if (!(flags & HASH_WRITE_OBJECT)) |
98e019b0 PO |
1834 | hash_sha1_file(sb.buf, sb.len, blob_type, oid->hash); |
1835 | else if (write_sha1_file(sb.buf, sb.len, blob_type, oid->hash)) | |
ea8e0297 | 1836 | rc = error("%s: failed to insert into database", path); |
b760d3aa | 1837 | strbuf_release(&sb); |
ec1fcc16 | 1838 | break; |
f35a6d3b | 1839 | case S_IFDIR: |
98e019b0 | 1840 | return resolve_gitlink_ref(path, "HEAD", oid->hash); |
ec1fcc16 JH |
1841 | default: |
1842 | return error("%s: unsupported file type", path); | |
1843 | } | |
ea8e0297 | 1844 | return rc; |
ec1fcc16 | 1845 | } |
a69e5429 JH |
1846 | |
1847 | int read_pack_header(int fd, struct pack_header *header) | |
1848 | { | |
f48ecd38 | 1849 | if (read_in_full(fd, header, sizeof(*header)) != sizeof(*header)) |
c697ad14 HO |
1850 | /* "eof before pack header was fully read" */ |
1851 | return PH_ERROR_EOF; | |
1852 | ||
a69e5429 JH |
1853 | if (header->hdr_signature != htonl(PACK_SIGNATURE)) |
1854 | /* "protocol error (pack signature mismatch detected)" */ | |
1855 | return PH_ERROR_PACK_SIGNATURE; | |
1856 | if (!pack_version_ok(header->hdr_version)) | |
1857 | /* "protocol error (pack version unsupported)" */ | |
1858 | return PH_ERROR_PROTOCOL; | |
1859 | return 0; | |
1860 | } | |
40d52ff7 JK |
1861 | |
1862 | void assert_sha1_type(const unsigned char *sha1, enum object_type expect) | |
1863 | { | |
1864 | enum object_type type = sha1_object_info(sha1, NULL); | |
1865 | if (type < 0) | |
1866 | die("%s is not a valid object", sha1_to_hex(sha1)); | |
1867 | if (type != expect) | |
1868 | die("%s is not a valid '%s' object", sha1_to_hex(sha1), | |
1869 | typename(expect)); | |
1870 | } | |
27e1e22d | 1871 | |
70c49050 | 1872 | int for_each_file_in_obj_subdir(unsigned int subdir_nr, |
cc817ca3 RS |
1873 | struct strbuf *path, |
1874 | each_loose_object_fn obj_cb, | |
1875 | each_loose_cruft_fn cruft_cb, | |
1876 | each_loose_subdir_fn subdir_cb, | |
1877 | void *data) | |
27e1e22d | 1878 | { |
0375f472 RS |
1879 | size_t origlen, baselen; |
1880 | DIR *dir; | |
27e1e22d JK |
1881 | struct dirent *de; |
1882 | int r = 0; | |
1883 | ||
70c49050 RS |
1884 | if (subdir_nr > 0xff) |
1885 | BUG("invalid loose object subdirectory: %x", subdir_nr); | |
1886 | ||
0375f472 RS |
1887 | origlen = path->len; |
1888 | strbuf_complete(path, '/'); | |
1889 | strbuf_addf(path, "%02x", subdir_nr); | |
1890 | baselen = path->len; | |
1891 | ||
1892 | dir = opendir(path->buf); | |
27e1e22d | 1893 | if (!dir) { |
0375f472 RS |
1894 | if (errno != ENOENT) |
1895 | r = error_errno("unable to open %s", path->buf); | |
1896 | strbuf_setlen(path, origlen); | |
1897 | return r; | |
27e1e22d JK |
1898 | } |
1899 | ||
1900 | while ((de = readdir(dir))) { | |
1901 | if (is_dot_or_dotdot(de->d_name)) | |
1902 | continue; | |
1903 | ||
1904 | strbuf_setlen(path, baselen); | |
1905 | strbuf_addf(path, "/%s", de->d_name); | |
1906 | ||
76c1d9a0 | 1907 | if (strlen(de->d_name) == GIT_SHA1_HEXSZ - 2) { |
dc01505f | 1908 | char hex[GIT_MAX_HEXSZ+1]; |
76c1d9a0 | 1909 | struct object_id oid; |
27e1e22d | 1910 | |
1a168e5c JK |
1911 | xsnprintf(hex, sizeof(hex), "%02x%s", |
1912 | subdir_nr, de->d_name); | |
76c1d9a0 | 1913 | if (!get_oid_hex(hex, &oid)) { |
27e1e22d | 1914 | if (obj_cb) { |
76c1d9a0 | 1915 | r = obj_cb(&oid, path->buf, data); |
27e1e22d JK |
1916 | if (r) |
1917 | break; | |
1918 | } | |
1919 | continue; | |
1920 | } | |
1921 | } | |
1922 | ||
1923 | if (cruft_cb) { | |
1924 | r = cruft_cb(de->d_name, path->buf, data); | |
1925 | if (r) | |
1926 | break; | |
1927 | } | |
1928 | } | |
094c7e63 | 1929 | closedir(dir); |
27e1e22d | 1930 | |
094c7e63 | 1931 | strbuf_setlen(path, baselen); |
27e1e22d JK |
1932 | if (!r && subdir_cb) |
1933 | r = subdir_cb(subdir_nr, path->buf, data); | |
1934 | ||
0375f472 RS |
1935 | strbuf_setlen(path, origlen); |
1936 | ||
27e1e22d JK |
1937 | return r; |
1938 | } | |
1939 | ||
e6f875e0 | 1940 | int for_each_loose_file_in_objdir_buf(struct strbuf *path, |
27e1e22d JK |
1941 | each_loose_object_fn obj_cb, |
1942 | each_loose_cruft_fn cruft_cb, | |
1943 | each_loose_subdir_fn subdir_cb, | |
1944 | void *data) | |
1945 | { | |
27e1e22d JK |
1946 | int r = 0; |
1947 | int i; | |
1948 | ||
27e1e22d | 1949 | for (i = 0; i < 256; i++) { |
e6f875e0 | 1950 | r = for_each_file_in_obj_subdir(i, path, obj_cb, cruft_cb, |
27e1e22d | 1951 | subdir_cb, data); |
27e1e22d JK |
1952 | if (r) |
1953 | break; | |
1954 | } | |
1955 | ||
e6f875e0 JK |
1956 | return r; |
1957 | } | |
1958 | ||
1959 | int for_each_loose_file_in_objdir(const char *path, | |
1960 | each_loose_object_fn obj_cb, | |
1961 | each_loose_cruft_fn cruft_cb, | |
1962 | each_loose_subdir_fn subdir_cb, | |
1963 | void *data) | |
1964 | { | |
1965 | struct strbuf buf = STRBUF_INIT; | |
1966 | int r; | |
1967 | ||
1968 | strbuf_addstr(&buf, path); | |
1969 | r = for_each_loose_file_in_objdir_buf(&buf, obj_cb, cruft_cb, | |
1970 | subdir_cb, data); | |
27e1e22d | 1971 | strbuf_release(&buf); |
e6f875e0 | 1972 | |
27e1e22d JK |
1973 | return r; |
1974 | } | |
660c889e JK |
1975 | |
1976 | struct loose_alt_odb_data { | |
1977 | each_loose_object_fn *cb; | |
1978 | void *data; | |
1979 | }; | |
1980 | ||
1981 | static int loose_from_alt_odb(struct alternate_object_database *alt, | |
1982 | void *vdata) | |
1983 | { | |
1984 | struct loose_alt_odb_data *data = vdata; | |
b0a42642 JM |
1985 | struct strbuf buf = STRBUF_INIT; |
1986 | int r; | |
1987 | ||
597f9134 | 1988 | strbuf_addstr(&buf, alt->path); |
b0a42642 JM |
1989 | r = for_each_loose_file_in_objdir_buf(&buf, |
1990 | data->cb, NULL, NULL, | |
1991 | data->data); | |
1992 | strbuf_release(&buf); | |
1993 | return r; | |
660c889e JK |
1994 | } |
1995 | ||
1385bb7b | 1996 | int for_each_loose_object(each_loose_object_fn cb, void *data, unsigned flags) |
660c889e JK |
1997 | { |
1998 | struct loose_alt_odb_data alt; | |
1999 | int r; | |
2000 | ||
2001 | r = for_each_loose_file_in_objdir(get_object_directory(), | |
2002 | cb, NULL, NULL, data); | |
2003 | if (r) | |
2004 | return r; | |
2005 | ||
1385bb7b JK |
2006 | if (flags & FOR_EACH_OBJECT_LOCAL_ONLY) |
2007 | return 0; | |
2008 | ||
660c889e JK |
2009 | alt.cb = cb; |
2010 | alt.data = data; | |
2011 | return foreach_alt_odb(loose_from_alt_odb, &alt); | |
2012 | } | |
2013 | ||
f6371f92 JK |
2014 | static int check_stream_sha1(git_zstream *stream, |
2015 | const char *hdr, | |
2016 | unsigned long size, | |
2017 | const char *path, | |
2018 | const unsigned char *expected_sha1) | |
2019 | { | |
2020 | git_SHA_CTX c; | |
cd02599c | 2021 | unsigned char real_sha1[GIT_MAX_RAWSZ]; |
f6371f92 JK |
2022 | unsigned char buf[4096]; |
2023 | unsigned long total_read; | |
2024 | int status = Z_OK; | |
2025 | ||
2026 | git_SHA1_Init(&c); | |
2027 | git_SHA1_Update(&c, hdr, stream->total_out); | |
2028 | ||
2029 | /* | |
2030 | * We already read some bytes into hdr, but the ones up to the NUL | |
2031 | * do not count against the object's content size. | |
2032 | */ | |
2033 | total_read = stream->total_out - strlen(hdr) - 1; | |
2034 | ||
2035 | /* | |
2036 | * This size comparison must be "<=" to read the final zlib packets; | |
2037 | * see the comment in unpack_sha1_rest for details. | |
2038 | */ | |
2039 | while (total_read <= size && | |
2040 | (status == Z_OK || status == Z_BUF_ERROR)) { | |
2041 | stream->next_out = buf; | |
2042 | stream->avail_out = sizeof(buf); | |
2043 | if (size - total_read < stream->avail_out) | |
2044 | stream->avail_out = size - total_read; | |
2045 | status = git_inflate(stream, Z_FINISH); | |
2046 | git_SHA1_Update(&c, buf, stream->next_out - buf); | |
2047 | total_read += stream->next_out - buf; | |
2048 | } | |
2049 | git_inflate_end(stream); | |
2050 | ||
2051 | if (status != Z_STREAM_END) { | |
2052 | error("corrupt loose object '%s'", sha1_to_hex(expected_sha1)); | |
2053 | return -1; | |
2054 | } | |
cce044df JK |
2055 | if (stream->avail_in) { |
2056 | error("garbage at end of loose object '%s'", | |
2057 | sha1_to_hex(expected_sha1)); | |
2058 | return -1; | |
2059 | } | |
f6371f92 JK |
2060 | |
2061 | git_SHA1_Final(real_sha1, &c); | |
2062 | if (hashcmp(expected_sha1, real_sha1)) { | |
2063 | error("sha1 mismatch for %s (expected %s)", path, | |
2064 | sha1_to_hex(expected_sha1)); | |
2065 | return -1; | |
2066 | } | |
2067 | ||
2068 | return 0; | |
2069 | } | |
2070 | ||
2071 | int read_loose_object(const char *path, | |
2072 | const unsigned char *expected_sha1, | |
2073 | enum object_type *type, | |
2074 | unsigned long *size, | |
2075 | void **contents) | |
2076 | { | |
2077 | int ret = -1; | |
f6371f92 JK |
2078 | void *map = NULL; |
2079 | unsigned long mapsize; | |
2080 | git_zstream stream; | |
2081 | char hdr[32]; | |
2082 | ||
2083 | *contents = NULL; | |
2084 | ||
2085 | map = map_sha1_file_1(path, NULL, &mapsize); | |
2086 | if (!map) { | |
2087 | error_errno("unable to mmap %s", path); | |
2088 | goto out; | |
2089 | } | |
2090 | ||
2091 | if (unpack_sha1_header(&stream, map, mapsize, hdr, sizeof(hdr)) < 0) { | |
2092 | error("unable to unpack header of %s", path); | |
2093 | goto out; | |
2094 | } | |
2095 | ||
2096 | *type = parse_sha1_header(hdr, size); | |
2097 | if (*type < 0) { | |
2098 | error("unable to parse header of %s", path); | |
2099 | git_inflate_end(&stream); | |
2100 | goto out; | |
2101 | } | |
2102 | ||
2103 | if (*type == OBJ_BLOB) { | |
2104 | if (check_stream_sha1(&stream, hdr, *size, path, expected_sha1) < 0) | |
2105 | goto out; | |
2106 | } else { | |
2107 | *contents = unpack_sha1_rest(&stream, hdr, *size, expected_sha1); | |
2108 | if (!*contents) { | |
2109 | error("unable to unpack contents of %s", path); | |
2110 | git_inflate_end(&stream); | |
2111 | goto out; | |
2112 | } | |
2113 | if (check_sha1_signature(expected_sha1, *contents, | |
2114 | *size, typename(*type))) { | |
2115 | error("sha1 mismatch for %s (expected %s)", path, | |
2116 | sha1_to_hex(expected_sha1)); | |
2117 | free(*contents); | |
2118 | goto out; | |
2119 | } | |
2120 | } | |
2121 | ||
2122 | ret = 0; /* everything checks out */ | |
2123 | ||
2124 | out: | |
2125 | if (map) | |
2126 | munmap(map, mapsize); | |
f6371f92 JK |
2127 | return ret; |
2128 | } |