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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 | */ | |
9 | #include "cache.h" | |
10 | #include "config.h" | |
11 | #include "string-list.h" | |
12 | #include "lockfile.h" | |
13 | #include "delta.h" | |
14 | #include "pack.h" | |
15 | #include "blob.h" | |
16 | #include "commit.h" | |
17 | #include "run-command.h" | |
18 | #include "tag.h" | |
19 | #include "tree.h" | |
20 | #include "tree-walk.h" | |
21 | #include "refs.h" | |
22 | #include "pack-revindex.h" | |
23 | #include "sha1-lookup.h" | |
24 | #include "bulk-checkin.h" | |
25 | #include "repository.h" | |
26 | #include "replace-object.h" | |
27 | #include "streaming.h" | |
28 | #include "dir.h" | |
29 | #include "list.h" | |
30 | #include "mergesort.h" | |
31 | #include "quote.h" | |
32 | #include "packfile.h" | |
33 | #include "fetch-object.h" | |
34 | #include "object-store.h" | |
35 | ||
36 | /* The maximum size for an object header. */ | |
37 | #define MAX_HEADER_LEN 32 | |
38 | ||
39 | ||
40 | #define EMPTY_TREE_SHA1_BIN_LITERAL \ | |
41 | "\x4b\x82\x5d\xc6\x42\xcb\x6e\xb9\xa0\x60" \ | |
42 | "\xe5\x4b\xf8\xd6\x92\x88\xfb\xee\x49\x04" | |
43 | #define EMPTY_TREE_SHA256_BIN_LITERAL \ | |
44 | "\x6e\xf1\x9b\x41\x22\x5c\x53\x69\xf1\xc1" \ | |
45 | "\x04\xd4\x5d\x8d\x85\xef\xa9\xb0\x57\xb5" \ | |
46 | "\x3b\x14\xb4\xb9\xb9\x39\xdd\x74\xde\xcc" \ | |
47 | "\x53\x21" | |
48 | ||
49 | #define EMPTY_BLOB_SHA1_BIN_LITERAL \ | |
50 | "\xe6\x9d\xe2\x9b\xb2\xd1\xd6\x43\x4b\x8b" \ | |
51 | "\x29\xae\x77\x5a\xd8\xc2\xe4\x8c\x53\x91" | |
52 | #define EMPTY_BLOB_SHA256_BIN_LITERAL \ | |
53 | "\x47\x3a\x0f\x4c\x3b\xe8\xa9\x36\x81\xa2" \ | |
54 | "\x67\xe3\xb1\xe9\xa7\xdc\xda\x11\x85\x43" \ | |
55 | "\x6f\xe1\x41\xf7\x74\x91\x20\xa3\x03\x72" \ | |
56 | "\x18\x13" | |
57 | ||
58 | const unsigned char null_sha1[GIT_MAX_RAWSZ]; | |
59 | const struct object_id null_oid; | |
60 | static const struct object_id empty_tree_oid = { | |
61 | EMPTY_TREE_SHA1_BIN_LITERAL | |
62 | }; | |
63 | static const struct object_id empty_blob_oid = { | |
64 | EMPTY_BLOB_SHA1_BIN_LITERAL | |
65 | }; | |
66 | static const struct object_id empty_tree_oid_sha256 = { | |
67 | EMPTY_TREE_SHA256_BIN_LITERAL | |
68 | }; | |
69 | static const struct object_id empty_blob_oid_sha256 = { | |
70 | EMPTY_BLOB_SHA256_BIN_LITERAL | |
71 | }; | |
72 | ||
73 | static void git_hash_sha1_init(git_hash_ctx *ctx) | |
74 | { | |
75 | git_SHA1_Init(&ctx->sha1); | |
76 | } | |
77 | ||
78 | static void git_hash_sha1_update(git_hash_ctx *ctx, const void *data, size_t len) | |
79 | { | |
80 | git_SHA1_Update(&ctx->sha1, data, len); | |
81 | } | |
82 | ||
83 | static void git_hash_sha1_final(unsigned char *hash, git_hash_ctx *ctx) | |
84 | { | |
85 | git_SHA1_Final(hash, &ctx->sha1); | |
86 | } | |
87 | ||
88 | ||
89 | static void git_hash_sha256_init(git_hash_ctx *ctx) | |
90 | { | |
91 | git_SHA256_Init(&ctx->sha256); | |
92 | } | |
93 | ||
94 | static void git_hash_sha256_update(git_hash_ctx *ctx, const void *data, size_t len) | |
95 | { | |
96 | git_SHA256_Update(&ctx->sha256, data, len); | |
97 | } | |
98 | ||
99 | static void git_hash_sha256_final(unsigned char *hash, git_hash_ctx *ctx) | |
100 | { | |
101 | git_SHA256_Final(hash, &ctx->sha256); | |
102 | } | |
103 | ||
104 | static void git_hash_unknown_init(git_hash_ctx *ctx) | |
105 | { | |
106 | BUG("trying to init unknown hash"); | |
107 | } | |
108 | ||
109 | static void git_hash_unknown_update(git_hash_ctx *ctx, const void *data, size_t len) | |
110 | { | |
111 | BUG("trying to update unknown hash"); | |
112 | } | |
113 | ||
114 | static void git_hash_unknown_final(unsigned char *hash, git_hash_ctx *ctx) | |
115 | { | |
116 | BUG("trying to finalize unknown hash"); | |
117 | } | |
118 | ||
119 | const struct git_hash_algo hash_algos[GIT_HASH_NALGOS] = { | |
120 | { | |
121 | NULL, | |
122 | 0x00000000, | |
123 | 0, | |
124 | 0, | |
125 | 0, | |
126 | git_hash_unknown_init, | |
127 | git_hash_unknown_update, | |
128 | git_hash_unknown_final, | |
129 | NULL, | |
130 | NULL, | |
131 | }, | |
132 | { | |
133 | "sha1", | |
134 | /* "sha1", big-endian */ | |
135 | 0x73686131, | |
136 | GIT_SHA1_RAWSZ, | |
137 | GIT_SHA1_HEXSZ, | |
138 | GIT_SHA1_BLKSZ, | |
139 | git_hash_sha1_init, | |
140 | git_hash_sha1_update, | |
141 | git_hash_sha1_final, | |
142 | &empty_tree_oid, | |
143 | &empty_blob_oid, | |
144 | }, | |
145 | { | |
146 | "sha256", | |
147 | /* "s256", big-endian */ | |
148 | 0x73323536, | |
149 | GIT_SHA256_RAWSZ, | |
150 | GIT_SHA256_HEXSZ, | |
151 | GIT_SHA256_BLKSZ, | |
152 | git_hash_sha256_init, | |
153 | git_hash_sha256_update, | |
154 | git_hash_sha256_final, | |
155 | &empty_tree_oid_sha256, | |
156 | &empty_blob_oid_sha256, | |
157 | } | |
158 | }; | |
159 | ||
160 | const char *empty_tree_oid_hex(void) | |
161 | { | |
162 | static char buf[GIT_MAX_HEXSZ + 1]; | |
163 | return oid_to_hex_r(buf, the_hash_algo->empty_tree); | |
164 | } | |
165 | ||
166 | const char *empty_blob_oid_hex(void) | |
167 | { | |
168 | static char buf[GIT_MAX_HEXSZ + 1]; | |
169 | return oid_to_hex_r(buf, the_hash_algo->empty_blob); | |
170 | } | |
171 | ||
172 | int hash_algo_by_name(const char *name) | |
173 | { | |
174 | int i; | |
175 | if (!name) | |
176 | return GIT_HASH_UNKNOWN; | |
177 | for (i = 1; i < GIT_HASH_NALGOS; i++) | |
178 | if (!strcmp(name, hash_algos[i].name)) | |
179 | return i; | |
180 | return GIT_HASH_UNKNOWN; | |
181 | } | |
182 | ||
183 | int hash_algo_by_id(uint32_t format_id) | |
184 | { | |
185 | int i; | |
186 | for (i = 1; i < GIT_HASH_NALGOS; i++) | |
187 | if (format_id == hash_algos[i].format_id) | |
188 | return i; | |
189 | return GIT_HASH_UNKNOWN; | |
190 | } | |
191 | ||
192 | ||
193 | /* | |
194 | * This is meant to hold a *small* number of objects that you would | |
195 | * want read_object_file() to be able to return, but yet you do not want | |
196 | * to write them into the object store (e.g. a browse-only | |
197 | * application). | |
198 | */ | |
199 | static struct cached_object { | |
200 | struct object_id oid; | |
201 | enum object_type type; | |
202 | void *buf; | |
203 | unsigned long size; | |
204 | } *cached_objects; | |
205 | static int cached_object_nr, cached_object_alloc; | |
206 | ||
207 | static struct cached_object empty_tree = { | |
208 | { EMPTY_TREE_SHA1_BIN_LITERAL }, | |
209 | OBJ_TREE, | |
210 | "", | |
211 | 0 | |
212 | }; | |
213 | ||
214 | static struct cached_object *find_cached_object(const struct object_id *oid) | |
215 | { | |
216 | int i; | |
217 | struct cached_object *co = cached_objects; | |
218 | ||
219 | for (i = 0; i < cached_object_nr; i++, co++) { | |
220 | if (oideq(&co->oid, oid)) | |
221 | return co; | |
222 | } | |
223 | if (oideq(oid, the_hash_algo->empty_tree)) | |
224 | return &empty_tree; | |
225 | return NULL; | |
226 | } | |
227 | ||
228 | ||
229 | static int get_conv_flags(unsigned flags) | |
230 | { | |
231 | if (flags & HASH_RENORMALIZE) | |
232 | return CONV_EOL_RENORMALIZE; | |
233 | else if (flags & HASH_WRITE_OBJECT) | |
234 | return global_conv_flags_eol | CONV_WRITE_OBJECT; | |
235 | else | |
236 | return 0; | |
237 | } | |
238 | ||
239 | ||
240 | int mkdir_in_gitdir(const char *path) | |
241 | { | |
242 | if (mkdir(path, 0777)) { | |
243 | int saved_errno = errno; | |
244 | struct stat st; | |
245 | struct strbuf sb = STRBUF_INIT; | |
246 | ||
247 | if (errno != EEXIST) | |
248 | return -1; | |
249 | /* | |
250 | * Are we looking at a path in a symlinked worktree | |
251 | * whose original repository does not yet have it? | |
252 | * e.g. .git/rr-cache pointing at its original | |
253 | * repository in which the user hasn't performed any | |
254 | * conflict resolution yet? | |
255 | */ | |
256 | if (lstat(path, &st) || !S_ISLNK(st.st_mode) || | |
257 | strbuf_readlink(&sb, path, st.st_size) || | |
258 | !is_absolute_path(sb.buf) || | |
259 | mkdir(sb.buf, 0777)) { | |
260 | strbuf_release(&sb); | |
261 | errno = saved_errno; | |
262 | return -1; | |
263 | } | |
264 | strbuf_release(&sb); | |
265 | } | |
266 | return adjust_shared_perm(path); | |
267 | } | |
268 | ||
269 | enum scld_error safe_create_leading_directories(char *path) | |
270 | { | |
271 | char *next_component = path + offset_1st_component(path); | |
272 | enum scld_error ret = SCLD_OK; | |
273 | ||
274 | while (ret == SCLD_OK && next_component) { | |
275 | struct stat st; | |
276 | char *slash = next_component, slash_character; | |
277 | ||
278 | while (*slash && !is_dir_sep(*slash)) | |
279 | slash++; | |
280 | ||
281 | if (!*slash) | |
282 | break; | |
283 | ||
284 | next_component = slash + 1; | |
285 | while (is_dir_sep(*next_component)) | |
286 | next_component++; | |
287 | if (!*next_component) | |
288 | break; | |
289 | ||
290 | slash_character = *slash; | |
291 | *slash = '\0'; | |
292 | if (!stat(path, &st)) { | |
293 | /* path exists */ | |
294 | if (!S_ISDIR(st.st_mode)) { | |
295 | errno = ENOTDIR; | |
296 | ret = SCLD_EXISTS; | |
297 | } | |
298 | } else if (mkdir(path, 0777)) { | |
299 | if (errno == EEXIST && | |
300 | !stat(path, &st) && S_ISDIR(st.st_mode)) | |
301 | ; /* somebody created it since we checked */ | |
302 | else if (errno == ENOENT) | |
303 | /* | |
304 | * Either mkdir() failed because | |
305 | * somebody just pruned the containing | |
306 | * directory, or stat() failed because | |
307 | * the file that was in our way was | |
308 | * just removed. Either way, inform | |
309 | * the caller that it might be worth | |
310 | * trying again: | |
311 | */ | |
312 | ret = SCLD_VANISHED; | |
313 | else | |
314 | ret = SCLD_FAILED; | |
315 | } else if (adjust_shared_perm(path)) { | |
316 | ret = SCLD_PERMS; | |
317 | } | |
318 | *slash = slash_character; | |
319 | } | |
320 | return ret; | |
321 | } | |
322 | ||
323 | enum scld_error safe_create_leading_directories_const(const char *path) | |
324 | { | |
325 | int save_errno; | |
326 | /* path points to cache entries, so xstrdup before messing with it */ | |
327 | char *buf = xstrdup(path); | |
328 | enum scld_error result = safe_create_leading_directories(buf); | |
329 | ||
330 | save_errno = errno; | |
331 | free(buf); | |
332 | errno = save_errno; | |
333 | return result; | |
334 | } | |
335 | ||
336 | int raceproof_create_file(const char *path, create_file_fn fn, void *cb) | |
337 | { | |
338 | /* | |
339 | * The number of times we will try to remove empty directories | |
340 | * in the way of path. This is only 1 because if another | |
341 | * process is racily creating directories that conflict with | |
342 | * us, we don't want to fight against them. | |
343 | */ | |
344 | int remove_directories_remaining = 1; | |
345 | ||
346 | /* | |
347 | * The number of times that we will try to create the | |
348 | * directories containing path. We are willing to attempt this | |
349 | * more than once, because another process could be trying to | |
350 | * clean up empty directories at the same time as we are | |
351 | * trying to create them. | |
352 | */ | |
353 | int create_directories_remaining = 3; | |
354 | ||
355 | /* A scratch copy of path, filled lazily if we need it: */ | |
356 | struct strbuf path_copy = STRBUF_INIT; | |
357 | ||
358 | int ret, save_errno; | |
359 | ||
360 | /* Sanity check: */ | |
361 | assert(*path); | |
362 | ||
363 | retry_fn: | |
364 | ret = fn(path, cb); | |
365 | save_errno = errno; | |
366 | if (!ret) | |
367 | goto out; | |
368 | ||
369 | if (errno == EISDIR && remove_directories_remaining-- > 0) { | |
370 | /* | |
371 | * A directory is in the way. Maybe it is empty; try | |
372 | * to remove it: | |
373 | */ | |
374 | if (!path_copy.len) | |
375 | strbuf_addstr(&path_copy, path); | |
376 | ||
377 | if (!remove_dir_recursively(&path_copy, REMOVE_DIR_EMPTY_ONLY)) | |
378 | goto retry_fn; | |
379 | } else if (errno == ENOENT && create_directories_remaining-- > 0) { | |
380 | /* | |
381 | * Maybe the containing directory didn't exist, or | |
382 | * maybe it was just deleted by a process that is | |
383 | * racing with us to clean up empty directories. Try | |
384 | * to create it: | |
385 | */ | |
386 | enum scld_error scld_result; | |
387 | ||
388 | if (!path_copy.len) | |
389 | strbuf_addstr(&path_copy, path); | |
390 | ||
391 | do { | |
392 | scld_result = safe_create_leading_directories(path_copy.buf); | |
393 | if (scld_result == SCLD_OK) | |
394 | goto retry_fn; | |
395 | } while (scld_result == SCLD_VANISHED && create_directories_remaining-- > 0); | |
396 | } | |
397 | ||
398 | out: | |
399 | strbuf_release(&path_copy); | |
400 | errno = save_errno; | |
401 | return ret; | |
402 | } | |
403 | ||
404 | static void fill_loose_path(struct strbuf *buf, const struct object_id *oid) | |
405 | { | |
406 | int i; | |
407 | for (i = 0; i < the_hash_algo->rawsz; i++) { | |
408 | static char hex[] = "0123456789abcdef"; | |
409 | unsigned int val = oid->hash[i]; | |
410 | strbuf_addch(buf, hex[val >> 4]); | |
411 | strbuf_addch(buf, hex[val & 0xf]); | |
412 | if (!i) | |
413 | strbuf_addch(buf, '/'); | |
414 | } | |
415 | } | |
416 | ||
417 | static const char *odb_loose_path(struct object_directory *odb, | |
418 | struct strbuf *buf, | |
419 | const struct object_id *oid) | |
420 | { | |
421 | strbuf_reset(buf); | |
422 | strbuf_addstr(buf, odb->path); | |
423 | strbuf_addch(buf, '/'); | |
424 | fill_loose_path(buf, oid); | |
425 | return buf->buf; | |
426 | } | |
427 | ||
428 | const char *loose_object_path(struct repository *r, struct strbuf *buf, | |
429 | const struct object_id *oid) | |
430 | { | |
431 | return odb_loose_path(r->objects->odb, buf, oid); | |
432 | } | |
433 | ||
434 | /* | |
435 | * Return non-zero iff the path is usable as an alternate object database. | |
436 | */ | |
437 | static int alt_odb_usable(struct raw_object_store *o, | |
438 | struct strbuf *path, | |
439 | const char *normalized_objdir) | |
440 | { | |
441 | struct object_directory *odb; | |
442 | ||
443 | /* Detect cases where alternate disappeared */ | |
444 | if (!is_directory(path->buf)) { | |
445 | error(_("object directory %s does not exist; " | |
446 | "check .git/objects/info/alternates"), | |
447 | path->buf); | |
448 | return 0; | |
449 | } | |
450 | ||
451 | /* | |
452 | * Prevent the common mistake of listing the same | |
453 | * thing twice, or object directory itself. | |
454 | */ | |
455 | for (odb = o->odb; odb; odb = odb->next) { | |
456 | if (!fspathcmp(path->buf, odb->path)) | |
457 | return 0; | |
458 | } | |
459 | if (!fspathcmp(path->buf, normalized_objdir)) | |
460 | return 0; | |
461 | ||
462 | return 1; | |
463 | } | |
464 | ||
465 | /* | |
466 | * Prepare alternate object database registry. | |
467 | * | |
468 | * The variable alt_odb_list points at the list of struct | |
469 | * object_directory. The elements on this list come from | |
470 | * non-empty elements from colon separated ALTERNATE_DB_ENVIRONMENT | |
471 | * environment variable, and $GIT_OBJECT_DIRECTORY/info/alternates, | |
472 | * whose contents is similar to that environment variable but can be | |
473 | * LF separated. Its base points at a statically allocated buffer that | |
474 | * contains "/the/directory/corresponding/to/.git/objects/...", while | |
475 | * its name points just after the slash at the end of ".git/objects/" | |
476 | * in the example above, and has enough space to hold 40-byte hex | |
477 | * SHA1, an extra slash for the first level indirection, and the | |
478 | * terminating NUL. | |
479 | */ | |
480 | static void read_info_alternates(struct repository *r, | |
481 | const char *relative_base, | |
482 | int depth); | |
483 | static int link_alt_odb_entry(struct repository *r, const char *entry, | |
484 | const char *relative_base, int depth, const char *normalized_objdir) | |
485 | { | |
486 | struct object_directory *ent; | |
487 | struct strbuf pathbuf = STRBUF_INIT; | |
488 | ||
489 | if (!is_absolute_path(entry) && relative_base) { | |
490 | strbuf_realpath(&pathbuf, relative_base, 1); | |
491 | strbuf_addch(&pathbuf, '/'); | |
492 | } | |
493 | strbuf_addstr(&pathbuf, entry); | |
494 | ||
495 | if (strbuf_normalize_path(&pathbuf) < 0 && relative_base) { | |
496 | error(_("unable to normalize alternate object path: %s"), | |
497 | pathbuf.buf); | |
498 | strbuf_release(&pathbuf); | |
499 | return -1; | |
500 | } | |
501 | ||
502 | /* | |
503 | * The trailing slash after the directory name is given by | |
504 | * this function at the end. Remove duplicates. | |
505 | */ | |
506 | while (pathbuf.len && pathbuf.buf[pathbuf.len - 1] == '/') | |
507 | strbuf_setlen(&pathbuf, pathbuf.len - 1); | |
508 | ||
509 | if (!alt_odb_usable(r->objects, &pathbuf, normalized_objdir)) { | |
510 | strbuf_release(&pathbuf); | |
511 | return -1; | |
512 | } | |
513 | ||
514 | ent = xcalloc(1, sizeof(*ent)); | |
515 | ent->path = xstrdup(pathbuf.buf); | |
516 | ||
517 | /* add the alternate entry */ | |
518 | *r->objects->odb_tail = ent; | |
519 | r->objects->odb_tail = &(ent->next); | |
520 | ent->next = NULL; | |
521 | ||
522 | /* recursively add alternates */ | |
523 | read_info_alternates(r, pathbuf.buf, depth + 1); | |
524 | ||
525 | strbuf_release(&pathbuf); | |
526 | return 0; | |
527 | } | |
528 | ||
529 | static const char *parse_alt_odb_entry(const char *string, | |
530 | int sep, | |
531 | struct strbuf *out) | |
532 | { | |
533 | const char *end; | |
534 | ||
535 | strbuf_reset(out); | |
536 | ||
537 | if (*string == '#') { | |
538 | /* comment; consume up to next separator */ | |
539 | end = strchrnul(string, sep); | |
540 | } else if (*string == '"' && !unquote_c_style(out, string, &end)) { | |
541 | /* | |
542 | * quoted path; unquote_c_style has copied the | |
543 | * data for us and set "end". Broken quoting (e.g., | |
544 | * an entry that doesn't end with a quote) falls | |
545 | * back to the unquoted case below. | |
546 | */ | |
547 | } else { | |
548 | /* normal, unquoted path */ | |
549 | end = strchrnul(string, sep); | |
550 | strbuf_add(out, string, end - string); | |
551 | } | |
552 | ||
553 | if (*end) | |
554 | end++; | |
555 | return end; | |
556 | } | |
557 | ||
558 | static void link_alt_odb_entries(struct repository *r, const char *alt, | |
559 | int sep, const char *relative_base, int depth) | |
560 | { | |
561 | struct strbuf objdirbuf = STRBUF_INIT; | |
562 | struct strbuf entry = STRBUF_INIT; | |
563 | ||
564 | if (!alt || !*alt) | |
565 | return; | |
566 | ||
567 | if (depth > 5) { | |
568 | error(_("%s: ignoring alternate object stores, nesting too deep"), | |
569 | relative_base); | |
570 | return; | |
571 | } | |
572 | ||
573 | strbuf_add_absolute_path(&objdirbuf, r->objects->odb->path); | |
574 | if (strbuf_normalize_path(&objdirbuf) < 0) | |
575 | die(_("unable to normalize object directory: %s"), | |
576 | objdirbuf.buf); | |
577 | ||
578 | while (*alt) { | |
579 | alt = parse_alt_odb_entry(alt, sep, &entry); | |
580 | if (!entry.len) | |
581 | continue; | |
582 | link_alt_odb_entry(r, entry.buf, | |
583 | relative_base, depth, objdirbuf.buf); | |
584 | } | |
585 | strbuf_release(&entry); | |
586 | strbuf_release(&objdirbuf); | |
587 | } | |
588 | ||
589 | static void read_info_alternates(struct repository *r, | |
590 | const char *relative_base, | |
591 | int depth) | |
592 | { | |
593 | char *path; | |
594 | struct strbuf buf = STRBUF_INIT; | |
595 | ||
596 | path = xstrfmt("%s/info/alternates", relative_base); | |
597 | if (strbuf_read_file(&buf, path, 1024) < 0) { | |
598 | warn_on_fopen_errors(path); | |
599 | free(path); | |
600 | return; | |
601 | } | |
602 | ||
603 | link_alt_odb_entries(r, buf.buf, '\n', relative_base, depth); | |
604 | strbuf_release(&buf); | |
605 | free(path); | |
606 | } | |
607 | ||
608 | void add_to_alternates_file(const char *reference) | |
609 | { | |
610 | struct lock_file lock = LOCK_INIT; | |
611 | char *alts = git_pathdup("objects/info/alternates"); | |
612 | FILE *in, *out; | |
613 | int found = 0; | |
614 | ||
615 | hold_lock_file_for_update(&lock, alts, LOCK_DIE_ON_ERROR); | |
616 | out = fdopen_lock_file(&lock, "w"); | |
617 | if (!out) | |
618 | die_errno(_("unable to fdopen alternates lockfile")); | |
619 | ||
620 | in = fopen(alts, "r"); | |
621 | if (in) { | |
622 | struct strbuf line = STRBUF_INIT; | |
623 | ||
624 | while (strbuf_getline(&line, in) != EOF) { | |
625 | if (!strcmp(reference, line.buf)) { | |
626 | found = 1; | |
627 | break; | |
628 | } | |
629 | fprintf_or_die(out, "%s\n", line.buf); | |
630 | } | |
631 | ||
632 | strbuf_release(&line); | |
633 | fclose(in); | |
634 | } | |
635 | else if (errno != ENOENT) | |
636 | die_errno(_("unable to read alternates file")); | |
637 | ||
638 | if (found) { | |
639 | rollback_lock_file(&lock); | |
640 | } else { | |
641 | fprintf_or_die(out, "%s\n", reference); | |
642 | if (commit_lock_file(&lock)) | |
643 | die_errno(_("unable to move new alternates file into place")); | |
644 | if (the_repository->objects->loaded_alternates) | |
645 | link_alt_odb_entries(the_repository, reference, | |
646 | '\n', NULL, 0); | |
647 | } | |
648 | free(alts); | |
649 | } | |
650 | ||
651 | void add_to_alternates_memory(const char *reference) | |
652 | { | |
653 | /* | |
654 | * Make sure alternates are initialized, or else our entry may be | |
655 | * overwritten when they are. | |
656 | */ | |
657 | prepare_alt_odb(the_repository); | |
658 | ||
659 | link_alt_odb_entries(the_repository, reference, | |
660 | '\n', NULL, 0); | |
661 | } | |
662 | ||
663 | /* | |
664 | * Compute the exact path an alternate is at and returns it. In case of | |
665 | * error NULL is returned and the human readable error is added to `err` | |
666 | * `path` may be relative and should point to $GIT_DIR. | |
667 | * `err` must not be null. | |
668 | */ | |
669 | char *compute_alternate_path(const char *path, struct strbuf *err) | |
670 | { | |
671 | char *ref_git = NULL; | |
672 | const char *repo, *ref_git_s; | |
673 | int seen_error = 0; | |
674 | ||
675 | ref_git_s = real_path_if_valid(path); | |
676 | if (!ref_git_s) { | |
677 | seen_error = 1; | |
678 | strbuf_addf(err, _("path '%s' does not exist"), path); | |
679 | goto out; | |
680 | } else | |
681 | /* | |
682 | * Beware: read_gitfile(), real_path() and mkpath() | |
683 | * return static buffer | |
684 | */ | |
685 | ref_git = xstrdup(ref_git_s); | |
686 | ||
687 | repo = read_gitfile(ref_git); | |
688 | if (!repo) | |
689 | repo = read_gitfile(mkpath("%s/.git", ref_git)); | |
690 | if (repo) { | |
691 | free(ref_git); | |
692 | ref_git = xstrdup(repo); | |
693 | } | |
694 | ||
695 | if (!repo && is_directory(mkpath("%s/.git/objects", ref_git))) { | |
696 | char *ref_git_git = mkpathdup("%s/.git", ref_git); | |
697 | free(ref_git); | |
698 | ref_git = ref_git_git; | |
699 | } else if (!is_directory(mkpath("%s/objects", ref_git))) { | |
700 | struct strbuf sb = STRBUF_INIT; | |
701 | seen_error = 1; | |
702 | if (get_common_dir(&sb, ref_git)) { | |
703 | strbuf_addf(err, | |
704 | _("reference repository '%s' as a linked " | |
705 | "checkout is not supported yet."), | |
706 | path); | |
707 | goto out; | |
708 | } | |
709 | ||
710 | strbuf_addf(err, _("reference repository '%s' is not a " | |
711 | "local repository."), path); | |
712 | goto out; | |
713 | } | |
714 | ||
715 | if (!access(mkpath("%s/shallow", ref_git), F_OK)) { | |
716 | strbuf_addf(err, _("reference repository '%s' is shallow"), | |
717 | path); | |
718 | seen_error = 1; | |
719 | goto out; | |
720 | } | |
721 | ||
722 | if (!access(mkpath("%s/info/grafts", ref_git), F_OK)) { | |
723 | strbuf_addf(err, | |
724 | _("reference repository '%s' is grafted"), | |
725 | path); | |
726 | seen_error = 1; | |
727 | goto out; | |
728 | } | |
729 | ||
730 | out: | |
731 | if (seen_error) { | |
732 | FREE_AND_NULL(ref_git); | |
733 | } | |
734 | ||
735 | return ref_git; | |
736 | } | |
737 | ||
738 | int foreach_alt_odb(alt_odb_fn fn, void *cb) | |
739 | { | |
740 | struct object_directory *ent; | |
741 | int r = 0; | |
742 | ||
743 | prepare_alt_odb(the_repository); | |
744 | for (ent = the_repository->objects->odb->next; ent; ent = ent->next) { | |
745 | r = fn(ent, cb); | |
746 | if (r) | |
747 | break; | |
748 | } | |
749 | return r; | |
750 | } | |
751 | ||
752 | void prepare_alt_odb(struct repository *r) | |
753 | { | |
754 | if (r->objects->loaded_alternates) | |
755 | return; | |
756 | ||
757 | link_alt_odb_entries(r, r->objects->alternate_db, PATH_SEP, NULL, 0); | |
758 | ||
759 | read_info_alternates(r, r->objects->odb->path, 0); | |
760 | r->objects->loaded_alternates = 1; | |
761 | } | |
762 | ||
763 | /* Returns 1 if we have successfully freshened the file, 0 otherwise. */ | |
764 | static int freshen_file(const char *fn) | |
765 | { | |
766 | struct utimbuf t; | |
767 | t.actime = t.modtime = time(NULL); | |
768 | return !utime(fn, &t); | |
769 | } | |
770 | ||
771 | /* | |
772 | * All of the check_and_freshen functions return 1 if the file exists and was | |
773 | * freshened (if freshening was requested), 0 otherwise. If they return | |
774 | * 0, you should not assume that it is safe to skip a write of the object (it | |
775 | * either does not exist on disk, or has a stale mtime and may be subject to | |
776 | * pruning). | |
777 | */ | |
778 | int check_and_freshen_file(const char *fn, int freshen) | |
779 | { | |
780 | if (access(fn, F_OK)) | |
781 | return 0; | |
782 | if (freshen && !freshen_file(fn)) | |
783 | return 0; | |
784 | return 1; | |
785 | } | |
786 | ||
787 | static int check_and_freshen_odb(struct object_directory *odb, | |
788 | const struct object_id *oid, | |
789 | int freshen) | |
790 | { | |
791 | static struct strbuf path = STRBUF_INIT; | |
792 | odb_loose_path(odb, &path, oid); | |
793 | return check_and_freshen_file(path.buf, freshen); | |
794 | } | |
795 | ||
796 | static int check_and_freshen_local(const struct object_id *oid, int freshen) | |
797 | { | |
798 | return check_and_freshen_odb(the_repository->objects->odb, oid, freshen); | |
799 | } | |
800 | ||
801 | static int check_and_freshen_nonlocal(const struct object_id *oid, int freshen) | |
802 | { | |
803 | struct object_directory *odb; | |
804 | ||
805 | prepare_alt_odb(the_repository); | |
806 | for (odb = the_repository->objects->odb->next; odb; odb = odb->next) { | |
807 | if (check_and_freshen_odb(odb, oid, freshen)) | |
808 | return 1; | |
809 | } | |
810 | return 0; | |
811 | } | |
812 | ||
813 | static int check_and_freshen(const struct object_id *oid, int freshen) | |
814 | { | |
815 | return check_and_freshen_local(oid, freshen) || | |
816 | check_and_freshen_nonlocal(oid, freshen); | |
817 | } | |
818 | ||
819 | int has_loose_object_nonlocal(const struct object_id *oid) | |
820 | { | |
821 | return check_and_freshen_nonlocal(oid, 0); | |
822 | } | |
823 | ||
824 | static int has_loose_object(const struct object_id *oid) | |
825 | { | |
826 | return check_and_freshen(oid, 0); | |
827 | } | |
828 | ||
829 | static void mmap_limit_check(size_t length) | |
830 | { | |
831 | static size_t limit = 0; | |
832 | if (!limit) { | |
833 | limit = git_env_ulong("GIT_MMAP_LIMIT", 0); | |
834 | if (!limit) | |
835 | limit = SIZE_MAX; | |
836 | } | |
837 | if (length > limit) | |
838 | die(_("attempting to mmap %"PRIuMAX" over limit %"PRIuMAX), | |
839 | (uintmax_t)length, (uintmax_t)limit); | |
840 | } | |
841 | ||
842 | void *xmmap_gently(void *start, size_t length, | |
843 | int prot, int flags, int fd, off_t offset) | |
844 | { | |
845 | void *ret; | |
846 | ||
847 | mmap_limit_check(length); | |
848 | ret = mmap(start, length, prot, flags, fd, offset); | |
849 | if (ret == MAP_FAILED) { | |
850 | if (!length) | |
851 | return NULL; | |
852 | release_pack_memory(length); | |
853 | ret = mmap(start, length, prot, flags, fd, offset); | |
854 | } | |
855 | return ret; | |
856 | } | |
857 | ||
858 | void *xmmap(void *start, size_t length, | |
859 | int prot, int flags, int fd, off_t offset) | |
860 | { | |
861 | void *ret = xmmap_gently(start, length, prot, flags, fd, offset); | |
862 | if (ret == MAP_FAILED) | |
863 | die_errno(_("mmap failed")); | |
864 | return ret; | |
865 | } | |
866 | ||
867 | /* | |
868 | * With an in-core object data in "map", rehash it to make sure the | |
869 | * object name actually matches "oid" to detect object corruption. | |
870 | * With "map" == NULL, try reading the object named with "oid" using | |
871 | * the streaming interface and rehash it to do the same. | |
872 | */ | |
873 | int check_object_signature(const struct object_id *oid, void *map, | |
874 | unsigned long size, const char *type) | |
875 | { | |
876 | struct object_id real_oid; | |
877 | enum object_type obj_type; | |
878 | struct git_istream *st; | |
879 | git_hash_ctx c; | |
880 | char hdr[MAX_HEADER_LEN]; | |
881 | int hdrlen; | |
882 | ||
883 | if (map) { | |
884 | hash_object_file(map, size, type, &real_oid); | |
885 | return !oideq(oid, &real_oid) ? -1 : 0; | |
886 | } | |
887 | ||
888 | st = open_istream(oid, &obj_type, &size, NULL); | |
889 | if (!st) | |
890 | return -1; | |
891 | ||
892 | /* Generate the header */ | |
893 | hdrlen = xsnprintf(hdr, sizeof(hdr), "%s %"PRIuMAX , type_name(obj_type), (uintmax_t)size) + 1; | |
894 | ||
895 | /* Sha1.. */ | |
896 | the_hash_algo->init_fn(&c); | |
897 | the_hash_algo->update_fn(&c, hdr, hdrlen); | |
898 | for (;;) { | |
899 | char buf[1024 * 16]; | |
900 | ssize_t readlen = read_istream(st, buf, sizeof(buf)); | |
901 | ||
902 | if (readlen < 0) { | |
903 | close_istream(st); | |
904 | return -1; | |
905 | } | |
906 | if (!readlen) | |
907 | break; | |
908 | the_hash_algo->update_fn(&c, buf, readlen); | |
909 | } | |
910 | the_hash_algo->final_fn(real_oid.hash, &c); | |
911 | close_istream(st); | |
912 | return !oideq(oid, &real_oid) ? -1 : 0; | |
913 | } | |
914 | ||
915 | int git_open_cloexec(const char *name, int flags) | |
916 | { | |
917 | int fd; | |
918 | static int o_cloexec = O_CLOEXEC; | |
919 | ||
920 | fd = open(name, flags | o_cloexec); | |
921 | if ((o_cloexec & O_CLOEXEC) && fd < 0 && errno == EINVAL) { | |
922 | /* Try again w/o O_CLOEXEC: the kernel might not support it */ | |
923 | o_cloexec &= ~O_CLOEXEC; | |
924 | fd = open(name, flags | o_cloexec); | |
925 | } | |
926 | ||
927 | #if defined(F_GETFD) && defined(F_SETFD) && defined(FD_CLOEXEC) | |
928 | { | |
929 | static int fd_cloexec = FD_CLOEXEC; | |
930 | ||
931 | if (!o_cloexec && 0 <= fd && fd_cloexec) { | |
932 | /* Opened w/o O_CLOEXEC? try with fcntl(2) to add it */ | |
933 | int flags = fcntl(fd, F_GETFD); | |
934 | if (fcntl(fd, F_SETFD, flags | fd_cloexec)) | |
935 | fd_cloexec = 0; | |
936 | } | |
937 | } | |
938 | #endif | |
939 | return fd; | |
940 | } | |
941 | ||
942 | /* | |
943 | * Find "oid" as a loose object in the local repository or in an alternate. | |
944 | * Returns 0 on success, negative on failure. | |
945 | * | |
946 | * The "path" out-parameter will give the path of the object we found (if any). | |
947 | * Note that it may point to static storage and is only valid until another | |
948 | * call to stat_loose_object(). | |
949 | */ | |
950 | static int stat_loose_object(struct repository *r, const struct object_id *oid, | |
951 | struct stat *st, const char **path) | |
952 | { | |
953 | struct object_directory *odb; | |
954 | static struct strbuf buf = STRBUF_INIT; | |
955 | ||
956 | prepare_alt_odb(r); | |
957 | for (odb = r->objects->odb; odb; odb = odb->next) { | |
958 | *path = odb_loose_path(odb, &buf, oid); | |
959 | if (!lstat(*path, st)) | |
960 | return 0; | |
961 | } | |
962 | ||
963 | return -1; | |
964 | } | |
965 | ||
966 | /* | |
967 | * Like stat_loose_object(), but actually open the object and return the | |
968 | * descriptor. See the caveats on the "path" parameter above. | |
969 | */ | |
970 | static int open_loose_object(struct repository *r, | |
971 | const struct object_id *oid, const char **path) | |
972 | { | |
973 | int fd; | |
974 | struct object_directory *odb; | |
975 | int most_interesting_errno = ENOENT; | |
976 | static struct strbuf buf = STRBUF_INIT; | |
977 | ||
978 | prepare_alt_odb(r); | |
979 | for (odb = r->objects->odb; odb; odb = odb->next) { | |
980 | *path = odb_loose_path(odb, &buf, oid); | |
981 | fd = git_open(*path); | |
982 | if (fd >= 0) | |
983 | return fd; | |
984 | ||
985 | if (most_interesting_errno == ENOENT) | |
986 | most_interesting_errno = errno; | |
987 | } | |
988 | errno = most_interesting_errno; | |
989 | return -1; | |
990 | } | |
991 | ||
992 | static int quick_has_loose(struct repository *r, | |
993 | const struct object_id *oid) | |
994 | { | |
995 | struct object_directory *odb; | |
996 | ||
997 | prepare_alt_odb(r); | |
998 | for (odb = r->objects->odb; odb; odb = odb->next) { | |
999 | if (oid_array_lookup(odb_loose_cache(odb, oid), oid) >= 0) | |
1000 | return 1; | |
1001 | } | |
1002 | return 0; | |
1003 | } | |
1004 | ||
1005 | /* | |
1006 | * Map the loose object at "path" if it is not NULL, or the path found by | |
1007 | * searching for a loose object named "oid". | |
1008 | */ | |
1009 | static void *map_loose_object_1(struct repository *r, const char *path, | |
1010 | const struct object_id *oid, unsigned long *size) | |
1011 | { | |
1012 | void *map; | |
1013 | int fd; | |
1014 | ||
1015 | if (path) | |
1016 | fd = git_open(path); | |
1017 | else | |
1018 | fd = open_loose_object(r, oid, &path); | |
1019 | map = NULL; | |
1020 | if (fd >= 0) { | |
1021 | struct stat st; | |
1022 | ||
1023 | if (!fstat(fd, &st)) { | |
1024 | *size = xsize_t(st.st_size); | |
1025 | if (!*size) { | |
1026 | /* mmap() is forbidden on empty files */ | |
1027 | error(_("object file %s is empty"), path); | |
1028 | close(fd); | |
1029 | return NULL; | |
1030 | } | |
1031 | map = xmmap(NULL, *size, PROT_READ, MAP_PRIVATE, fd, 0); | |
1032 | } | |
1033 | close(fd); | |
1034 | } | |
1035 | return map; | |
1036 | } | |
1037 | ||
1038 | void *map_loose_object(struct repository *r, | |
1039 | const struct object_id *oid, | |
1040 | unsigned long *size) | |
1041 | { | |
1042 | return map_loose_object_1(r, NULL, oid, size); | |
1043 | } | |
1044 | ||
1045 | static int unpack_loose_short_header(git_zstream *stream, | |
1046 | unsigned char *map, unsigned long mapsize, | |
1047 | void *buffer, unsigned long bufsiz) | |
1048 | { | |
1049 | /* Get the data stream */ | |
1050 | memset(stream, 0, sizeof(*stream)); | |
1051 | stream->next_in = map; | |
1052 | stream->avail_in = mapsize; | |
1053 | stream->next_out = buffer; | |
1054 | stream->avail_out = bufsiz; | |
1055 | ||
1056 | git_inflate_init(stream); | |
1057 | return git_inflate(stream, 0); | |
1058 | } | |
1059 | ||
1060 | int unpack_loose_header(git_zstream *stream, | |
1061 | unsigned char *map, unsigned long mapsize, | |
1062 | void *buffer, unsigned long bufsiz) | |
1063 | { | |
1064 | int status = unpack_loose_short_header(stream, map, mapsize, | |
1065 | buffer, bufsiz); | |
1066 | ||
1067 | if (status < Z_OK) | |
1068 | return status; | |
1069 | ||
1070 | /* Make sure we have the terminating NUL */ | |
1071 | if (!memchr(buffer, '\0', stream->next_out - (unsigned char *)buffer)) | |
1072 | return -1; | |
1073 | return 0; | |
1074 | } | |
1075 | ||
1076 | static int unpack_loose_header_to_strbuf(git_zstream *stream, unsigned char *map, | |
1077 | unsigned long mapsize, void *buffer, | |
1078 | unsigned long bufsiz, struct strbuf *header) | |
1079 | { | |
1080 | int status; | |
1081 | ||
1082 | status = unpack_loose_short_header(stream, map, mapsize, buffer, bufsiz); | |
1083 | if (status < Z_OK) | |
1084 | return -1; | |
1085 | ||
1086 | /* | |
1087 | * Check if entire header is unpacked in the first iteration. | |
1088 | */ | |
1089 | if (memchr(buffer, '\0', stream->next_out - (unsigned char *)buffer)) | |
1090 | return 0; | |
1091 | ||
1092 | /* | |
1093 | * buffer[0..bufsiz] was not large enough. Copy the partial | |
1094 | * result out to header, and then append the result of further | |
1095 | * reading the stream. | |
1096 | */ | |
1097 | strbuf_add(header, buffer, stream->next_out - (unsigned char *)buffer); | |
1098 | stream->next_out = buffer; | |
1099 | stream->avail_out = bufsiz; | |
1100 | ||
1101 | do { | |
1102 | status = git_inflate(stream, 0); | |
1103 | strbuf_add(header, buffer, stream->next_out - (unsigned char *)buffer); | |
1104 | if (memchr(buffer, '\0', stream->next_out - (unsigned char *)buffer)) | |
1105 | return 0; | |
1106 | stream->next_out = buffer; | |
1107 | stream->avail_out = bufsiz; | |
1108 | } while (status != Z_STREAM_END); | |
1109 | return -1; | |
1110 | } | |
1111 | ||
1112 | static void *unpack_loose_rest(git_zstream *stream, | |
1113 | void *buffer, unsigned long size, | |
1114 | const struct object_id *oid) | |
1115 | { | |
1116 | int bytes = strlen(buffer) + 1; | |
1117 | unsigned char *buf = xmallocz(size); | |
1118 | unsigned long n; | |
1119 | int status = Z_OK; | |
1120 | ||
1121 | n = stream->total_out - bytes; | |
1122 | if (n > size) | |
1123 | n = size; | |
1124 | memcpy(buf, (char *) buffer + bytes, n); | |
1125 | bytes = n; | |
1126 | if (bytes <= size) { | |
1127 | /* | |
1128 | * The above condition must be (bytes <= size), not | |
1129 | * (bytes < size). In other words, even though we | |
1130 | * expect no more output and set avail_out to zero, | |
1131 | * the input zlib stream may have bytes that express | |
1132 | * "this concludes the stream", and we *do* want to | |
1133 | * eat that input. | |
1134 | * | |
1135 | * Otherwise we would not be able to test that we | |
1136 | * consumed all the input to reach the expected size; | |
1137 | * we also want to check that zlib tells us that all | |
1138 | * went well with status == Z_STREAM_END at the end. | |
1139 | */ | |
1140 | stream->next_out = buf + bytes; | |
1141 | stream->avail_out = size - bytes; | |
1142 | while (status == Z_OK) | |
1143 | status = git_inflate(stream, Z_FINISH); | |
1144 | } | |
1145 | if (status == Z_STREAM_END && !stream->avail_in) { | |
1146 | git_inflate_end(stream); | |
1147 | return buf; | |
1148 | } | |
1149 | ||
1150 | if (status < 0) | |
1151 | error(_("corrupt loose object '%s'"), oid_to_hex(oid)); | |
1152 | else if (stream->avail_in) | |
1153 | error(_("garbage at end of loose object '%s'"), | |
1154 | oid_to_hex(oid)); | |
1155 | free(buf); | |
1156 | return NULL; | |
1157 | } | |
1158 | ||
1159 | /* | |
1160 | * We used to just use "sscanf()", but that's actually way | |
1161 | * too permissive for what we want to check. So do an anal | |
1162 | * object header parse by hand. | |
1163 | */ | |
1164 | static int parse_loose_header_extended(const char *hdr, struct object_info *oi, | |
1165 | unsigned int flags) | |
1166 | { | |
1167 | const char *type_buf = hdr; | |
1168 | unsigned long size; | |
1169 | int type, type_len = 0; | |
1170 | ||
1171 | /* | |
1172 | * The type can be of any size but is followed by | |
1173 | * a space. | |
1174 | */ | |
1175 | for (;;) { | |
1176 | char c = *hdr++; | |
1177 | if (!c) | |
1178 | return -1; | |
1179 | if (c == ' ') | |
1180 | break; | |
1181 | type_len++; | |
1182 | } | |
1183 | ||
1184 | type = type_from_string_gently(type_buf, type_len, 1); | |
1185 | if (oi->type_name) | |
1186 | strbuf_add(oi->type_name, type_buf, type_len); | |
1187 | /* | |
1188 | * Set type to 0 if its an unknown object and | |
1189 | * we're obtaining the type using '--allow-unknown-type' | |
1190 | * option. | |
1191 | */ | |
1192 | if ((flags & OBJECT_INFO_ALLOW_UNKNOWN_TYPE) && (type < 0)) | |
1193 | type = 0; | |
1194 | else if (type < 0) | |
1195 | die(_("invalid object type")); | |
1196 | if (oi->typep) | |
1197 | *oi->typep = type; | |
1198 | ||
1199 | /* | |
1200 | * The length must follow immediately, and be in canonical | |
1201 | * decimal format (ie "010" is not valid). | |
1202 | */ | |
1203 | size = *hdr++ - '0'; | |
1204 | if (size > 9) | |
1205 | return -1; | |
1206 | if (size) { | |
1207 | for (;;) { | |
1208 | unsigned long c = *hdr - '0'; | |
1209 | if (c > 9) | |
1210 | break; | |
1211 | hdr++; | |
1212 | size = size * 10 + c; | |
1213 | } | |
1214 | } | |
1215 | ||
1216 | if (oi->sizep) | |
1217 | *oi->sizep = size; | |
1218 | ||
1219 | /* | |
1220 | * The length must be followed by a zero byte | |
1221 | */ | |
1222 | return *hdr ? -1 : type; | |
1223 | } | |
1224 | ||
1225 | int parse_loose_header(const char *hdr, unsigned long *sizep) | |
1226 | { | |
1227 | struct object_info oi = OBJECT_INFO_INIT; | |
1228 | ||
1229 | oi.sizep = sizep; | |
1230 | return parse_loose_header_extended(hdr, &oi, 0); | |
1231 | } | |
1232 | ||
1233 | static int loose_object_info(struct repository *r, | |
1234 | const struct object_id *oid, | |
1235 | struct object_info *oi, int flags) | |
1236 | { | |
1237 | int status = 0; | |
1238 | unsigned long mapsize; | |
1239 | void *map; | |
1240 | git_zstream stream; | |
1241 | char hdr[MAX_HEADER_LEN]; | |
1242 | struct strbuf hdrbuf = STRBUF_INIT; | |
1243 | unsigned long size_scratch; | |
1244 | ||
1245 | if (oi->delta_base_sha1) | |
1246 | hashclr(oi->delta_base_sha1); | |
1247 | ||
1248 | /* | |
1249 | * If we don't care about type or size, then we don't | |
1250 | * need to look inside the object at all. Note that we | |
1251 | * do not optimize out the stat call, even if the | |
1252 | * caller doesn't care about the disk-size, since our | |
1253 | * return value implicitly indicates whether the | |
1254 | * object even exists. | |
1255 | */ | |
1256 | if (!oi->typep && !oi->type_name && !oi->sizep && !oi->contentp) { | |
1257 | const char *path; | |
1258 | struct stat st; | |
1259 | if (!oi->disk_sizep && (flags & OBJECT_INFO_QUICK)) | |
1260 | return quick_has_loose(r, oid) ? 0 : -1; | |
1261 | if (stat_loose_object(r, oid, &st, &path) < 0) | |
1262 | return -1; | |
1263 | if (oi->disk_sizep) | |
1264 | *oi->disk_sizep = st.st_size; | |
1265 | return 0; | |
1266 | } | |
1267 | ||
1268 | map = map_loose_object(r, oid, &mapsize); | |
1269 | if (!map) | |
1270 | return -1; | |
1271 | ||
1272 | if (!oi->sizep) | |
1273 | oi->sizep = &size_scratch; | |
1274 | ||
1275 | if (oi->disk_sizep) | |
1276 | *oi->disk_sizep = mapsize; | |
1277 | if ((flags & OBJECT_INFO_ALLOW_UNKNOWN_TYPE)) { | |
1278 | if (unpack_loose_header_to_strbuf(&stream, map, mapsize, hdr, sizeof(hdr), &hdrbuf) < 0) | |
1279 | status = error(_("unable to unpack %s header with --allow-unknown-type"), | |
1280 | oid_to_hex(oid)); | |
1281 | } else if (unpack_loose_header(&stream, map, mapsize, hdr, sizeof(hdr)) < 0) | |
1282 | status = error(_("unable to unpack %s header"), | |
1283 | oid_to_hex(oid)); | |
1284 | if (status < 0) | |
1285 | ; /* Do nothing */ | |
1286 | else if (hdrbuf.len) { | |
1287 | if ((status = parse_loose_header_extended(hdrbuf.buf, oi, flags)) < 0) | |
1288 | status = error(_("unable to parse %s header with --allow-unknown-type"), | |
1289 | oid_to_hex(oid)); | |
1290 | } else if ((status = parse_loose_header_extended(hdr, oi, flags)) < 0) | |
1291 | status = error(_("unable to parse %s header"), oid_to_hex(oid)); | |
1292 | ||
1293 | if (status >= 0 && oi->contentp) { | |
1294 | *oi->contentp = unpack_loose_rest(&stream, hdr, | |
1295 | *oi->sizep, oid); | |
1296 | if (!*oi->contentp) { | |
1297 | git_inflate_end(&stream); | |
1298 | status = -1; | |
1299 | } | |
1300 | } else | |
1301 | git_inflate_end(&stream); | |
1302 | ||
1303 | munmap(map, mapsize); | |
1304 | if (status && oi->typep) | |
1305 | *oi->typep = status; | |
1306 | if (oi->sizep == &size_scratch) | |
1307 | oi->sizep = NULL; | |
1308 | strbuf_release(&hdrbuf); | |
1309 | oi->whence = OI_LOOSE; | |
1310 | return (status < 0) ? status : 0; | |
1311 | } | |
1312 | ||
1313 | int fetch_if_missing = 1; | |
1314 | ||
1315 | int oid_object_info_extended(struct repository *r, const struct object_id *oid, | |
1316 | struct object_info *oi, unsigned flags) | |
1317 | { | |
1318 | static struct object_info blank_oi = OBJECT_INFO_INIT; | |
1319 | struct pack_entry e; | |
1320 | int rtype; | |
1321 | const struct object_id *real = oid; | |
1322 | int already_retried = 0; | |
1323 | ||
1324 | if (flags & OBJECT_INFO_LOOKUP_REPLACE) | |
1325 | real = lookup_replace_object(r, oid); | |
1326 | ||
1327 | if (is_null_oid(real)) | |
1328 | return -1; | |
1329 | ||
1330 | if (!oi) | |
1331 | oi = &blank_oi; | |
1332 | ||
1333 | if (!(flags & OBJECT_INFO_SKIP_CACHED)) { | |
1334 | struct cached_object *co = find_cached_object(real); | |
1335 | if (co) { | |
1336 | if (oi->typep) | |
1337 | *(oi->typep) = co->type; | |
1338 | if (oi->sizep) | |
1339 | *(oi->sizep) = co->size; | |
1340 | if (oi->disk_sizep) | |
1341 | *(oi->disk_sizep) = 0; | |
1342 | if (oi->delta_base_sha1) | |
1343 | hashclr(oi->delta_base_sha1); | |
1344 | if (oi->type_name) | |
1345 | strbuf_addstr(oi->type_name, type_name(co->type)); | |
1346 | if (oi->contentp) | |
1347 | *oi->contentp = xmemdupz(co->buf, co->size); | |
1348 | oi->whence = OI_CACHED; | |
1349 | return 0; | |
1350 | } | |
1351 | } | |
1352 | ||
1353 | while (1) { | |
1354 | if (find_pack_entry(r, real, &e)) | |
1355 | break; | |
1356 | ||
1357 | if (flags & OBJECT_INFO_IGNORE_LOOSE) | |
1358 | return -1; | |
1359 | ||
1360 | /* Most likely it's a loose object. */ | |
1361 | if (!loose_object_info(r, real, oi, flags)) | |
1362 | return 0; | |
1363 | ||
1364 | /* Not a loose object; someone else may have just packed it. */ | |
1365 | if (!(flags & OBJECT_INFO_QUICK)) { | |
1366 | reprepare_packed_git(r); | |
1367 | if (find_pack_entry(r, real, &e)) | |
1368 | break; | |
1369 | } | |
1370 | ||
1371 | /* Check if it is a missing object */ | |
1372 | if (fetch_if_missing && repository_format_partial_clone && | |
1373 | !already_retried && r == the_repository) { | |
1374 | /* | |
1375 | * TODO Investigate having fetch_object() return | |
1376 | * TODO error/success and stopping the music here. | |
1377 | * TODO Pass a repository struct through fetch_object, | |
1378 | * such that arbitrary repositories work. | |
1379 | */ | |
1380 | fetch_objects(repository_format_partial_clone, real, 1); | |
1381 | already_retried = 1; | |
1382 | continue; | |
1383 | } | |
1384 | ||
1385 | return -1; | |
1386 | } | |
1387 | ||
1388 | if (oi == &blank_oi) | |
1389 | /* | |
1390 | * We know that the caller doesn't actually need the | |
1391 | * information below, so return early. | |
1392 | */ | |
1393 | return 0; | |
1394 | rtype = packed_object_info(r, e.p, e.offset, oi); | |
1395 | if (rtype < 0) { | |
1396 | mark_bad_packed_object(e.p, real->hash); | |
1397 | return oid_object_info_extended(r, real, oi, 0); | |
1398 | } else if (oi->whence == OI_PACKED) { | |
1399 | oi->u.packed.offset = e.offset; | |
1400 | oi->u.packed.pack = e.p; | |
1401 | oi->u.packed.is_delta = (rtype == OBJ_REF_DELTA || | |
1402 | rtype == OBJ_OFS_DELTA); | |
1403 | } | |
1404 | ||
1405 | return 0; | |
1406 | } | |
1407 | ||
1408 | /* returns enum object_type or negative */ | |
1409 | int oid_object_info(struct repository *r, | |
1410 | const struct object_id *oid, | |
1411 | unsigned long *sizep) | |
1412 | { | |
1413 | enum object_type type; | |
1414 | struct object_info oi = OBJECT_INFO_INIT; | |
1415 | ||
1416 | oi.typep = &type; | |
1417 | oi.sizep = sizep; | |
1418 | if (oid_object_info_extended(r, oid, &oi, | |
1419 | OBJECT_INFO_LOOKUP_REPLACE) < 0) | |
1420 | return -1; | |
1421 | return type; | |
1422 | } | |
1423 | ||
1424 | static void *read_object(struct repository *r, | |
1425 | const struct object_id *oid, enum object_type *type, | |
1426 | unsigned long *size) | |
1427 | { | |
1428 | struct object_info oi = OBJECT_INFO_INIT; | |
1429 | void *content; | |
1430 | oi.typep = type; | |
1431 | oi.sizep = size; | |
1432 | oi.contentp = &content; | |
1433 | ||
1434 | if (oid_object_info_extended(r, oid, &oi, 0) < 0) | |
1435 | return NULL; | |
1436 | return content; | |
1437 | } | |
1438 | ||
1439 | int pretend_object_file(void *buf, unsigned long len, enum object_type type, | |
1440 | struct object_id *oid) | |
1441 | { | |
1442 | struct cached_object *co; | |
1443 | ||
1444 | hash_object_file(buf, len, type_name(type), oid); | |
1445 | if (has_object_file(oid) || find_cached_object(oid)) | |
1446 | return 0; | |
1447 | ALLOC_GROW(cached_objects, cached_object_nr + 1, cached_object_alloc); | |
1448 | co = &cached_objects[cached_object_nr++]; | |
1449 | co->size = len; | |
1450 | co->type = type; | |
1451 | co->buf = xmalloc(len); | |
1452 | memcpy(co->buf, buf, len); | |
1453 | oidcpy(&co->oid, oid); | |
1454 | return 0; | |
1455 | } | |
1456 | ||
1457 | /* | |
1458 | * This function dies on corrupt objects; the callers who want to | |
1459 | * deal with them should arrange to call read_object() and give error | |
1460 | * messages themselves. | |
1461 | */ | |
1462 | void *read_object_file_extended(struct repository *r, | |
1463 | const struct object_id *oid, | |
1464 | enum object_type *type, | |
1465 | unsigned long *size, | |
1466 | int lookup_replace) | |
1467 | { | |
1468 | void *data; | |
1469 | const struct packed_git *p; | |
1470 | const char *path; | |
1471 | struct stat st; | |
1472 | const struct object_id *repl = lookup_replace ? | |
1473 | lookup_replace_object(r, oid) : oid; | |
1474 | ||
1475 | errno = 0; | |
1476 | data = read_object(r, repl, type, size); | |
1477 | if (data) | |
1478 | return data; | |
1479 | ||
1480 | if (errno && errno != ENOENT) | |
1481 | die_errno(_("failed to read object %s"), oid_to_hex(oid)); | |
1482 | ||
1483 | /* die if we replaced an object with one that does not exist */ | |
1484 | if (repl != oid) | |
1485 | die(_("replacement %s not found for %s"), | |
1486 | oid_to_hex(repl), oid_to_hex(oid)); | |
1487 | ||
1488 | if (!stat_loose_object(r, repl, &st, &path)) | |
1489 | die(_("loose object %s (stored in %s) is corrupt"), | |
1490 | oid_to_hex(repl), path); | |
1491 | ||
1492 | if ((p = has_packed_and_bad(r, repl->hash)) != NULL) | |
1493 | die(_("packed object %s (stored in %s) is corrupt"), | |
1494 | oid_to_hex(repl), p->pack_name); | |
1495 | ||
1496 | return NULL; | |
1497 | } | |
1498 | ||
1499 | void *read_object_with_reference(const struct object_id *oid, | |
1500 | const char *required_type_name, | |
1501 | unsigned long *size, | |
1502 | struct object_id *actual_oid_return) | |
1503 | { | |
1504 | enum object_type type, required_type; | |
1505 | void *buffer; | |
1506 | unsigned long isize; | |
1507 | struct object_id actual_oid; | |
1508 | ||
1509 | required_type = type_from_string(required_type_name); | |
1510 | oidcpy(&actual_oid, oid); | |
1511 | while (1) { | |
1512 | int ref_length = -1; | |
1513 | const char *ref_type = NULL; | |
1514 | ||
1515 | buffer = read_object_file(&actual_oid, &type, &isize); | |
1516 | if (!buffer) | |
1517 | return NULL; | |
1518 | if (type == required_type) { | |
1519 | *size = isize; | |
1520 | if (actual_oid_return) | |
1521 | oidcpy(actual_oid_return, &actual_oid); | |
1522 | return buffer; | |
1523 | } | |
1524 | /* Handle references */ | |
1525 | else if (type == OBJ_COMMIT) | |
1526 | ref_type = "tree "; | |
1527 | else if (type == OBJ_TAG) | |
1528 | ref_type = "object "; | |
1529 | else { | |
1530 | free(buffer); | |
1531 | return NULL; | |
1532 | } | |
1533 | ref_length = strlen(ref_type); | |
1534 | ||
1535 | if (ref_length + the_hash_algo->hexsz > isize || | |
1536 | memcmp(buffer, ref_type, ref_length) || | |
1537 | get_oid_hex((char *) buffer + ref_length, &actual_oid)) { | |
1538 | free(buffer); | |
1539 | return NULL; | |
1540 | } | |
1541 | free(buffer); | |
1542 | /* Now we have the ID of the referred-to object in | |
1543 | * actual_oid. Check again. */ | |
1544 | } | |
1545 | } | |
1546 | ||
1547 | static void write_object_file_prepare(const void *buf, unsigned long len, | |
1548 | const char *type, struct object_id *oid, | |
1549 | char *hdr, int *hdrlen) | |
1550 | { | |
1551 | git_hash_ctx c; | |
1552 | ||
1553 | /* Generate the header */ | |
1554 | *hdrlen = xsnprintf(hdr, *hdrlen, "%s %"PRIuMAX , type, (uintmax_t)len)+1; | |
1555 | ||
1556 | /* Sha1.. */ | |
1557 | the_hash_algo->init_fn(&c); | |
1558 | the_hash_algo->update_fn(&c, hdr, *hdrlen); | |
1559 | the_hash_algo->update_fn(&c, buf, len); | |
1560 | the_hash_algo->final_fn(oid->hash, &c); | |
1561 | } | |
1562 | ||
1563 | /* | |
1564 | * Move the just written object into its final resting place. | |
1565 | */ | |
1566 | int finalize_object_file(const char *tmpfile, const char *filename) | |
1567 | { | |
1568 | int ret = 0; | |
1569 | ||
1570 | if (object_creation_mode == OBJECT_CREATION_USES_RENAMES) | |
1571 | goto try_rename; | |
1572 | else if (link(tmpfile, filename)) | |
1573 | ret = errno; | |
1574 | ||
1575 | /* | |
1576 | * Coda hack - coda doesn't like cross-directory links, | |
1577 | * so we fall back to a rename, which will mean that it | |
1578 | * won't be able to check collisions, but that's not a | |
1579 | * big deal. | |
1580 | * | |
1581 | * The same holds for FAT formatted media. | |
1582 | * | |
1583 | * When this succeeds, we just return. We have nothing | |
1584 | * left to unlink. | |
1585 | */ | |
1586 | if (ret && ret != EEXIST) { | |
1587 | try_rename: | |
1588 | if (!rename(tmpfile, filename)) | |
1589 | goto out; | |
1590 | ret = errno; | |
1591 | } | |
1592 | unlink_or_warn(tmpfile); | |
1593 | if (ret) { | |
1594 | if (ret != EEXIST) { | |
1595 | return error_errno(_("unable to write file %s"), filename); | |
1596 | } | |
1597 | /* FIXME!!! Collision check here ? */ | |
1598 | } | |
1599 | ||
1600 | out: | |
1601 | if (adjust_shared_perm(filename)) | |
1602 | return error(_("unable to set permission to '%s'"), filename); | |
1603 | return 0; | |
1604 | } | |
1605 | ||
1606 | static int write_buffer(int fd, const void *buf, size_t len) | |
1607 | { | |
1608 | if (write_in_full(fd, buf, len) < 0) | |
1609 | return error_errno(_("file write error")); | |
1610 | return 0; | |
1611 | } | |
1612 | ||
1613 | int hash_object_file(const void *buf, unsigned long len, const char *type, | |
1614 | struct object_id *oid) | |
1615 | { | |
1616 | char hdr[MAX_HEADER_LEN]; | |
1617 | int hdrlen = sizeof(hdr); | |
1618 | write_object_file_prepare(buf, len, type, oid, hdr, &hdrlen); | |
1619 | return 0; | |
1620 | } | |
1621 | ||
1622 | /* Finalize a file on disk, and close it. */ | |
1623 | static void close_loose_object(int fd) | |
1624 | { | |
1625 | if (fsync_object_files) | |
1626 | fsync_or_die(fd, "loose object file"); | |
1627 | if (close(fd) != 0) | |
1628 | die_errno(_("error when closing loose object file")); | |
1629 | } | |
1630 | ||
1631 | /* Size of directory component, including the ending '/' */ | |
1632 | static inline int directory_size(const char *filename) | |
1633 | { | |
1634 | const char *s = strrchr(filename, '/'); | |
1635 | if (!s) | |
1636 | return 0; | |
1637 | return s - filename + 1; | |
1638 | } | |
1639 | ||
1640 | /* | |
1641 | * This creates a temporary file in the same directory as the final | |
1642 | * 'filename' | |
1643 | * | |
1644 | * We want to avoid cross-directory filename renames, because those | |
1645 | * can have problems on various filesystems (FAT, NFS, Coda). | |
1646 | */ | |
1647 | static int create_tmpfile(struct strbuf *tmp, const char *filename) | |
1648 | { | |
1649 | int fd, dirlen = directory_size(filename); | |
1650 | ||
1651 | strbuf_reset(tmp); | |
1652 | strbuf_add(tmp, filename, dirlen); | |
1653 | strbuf_addstr(tmp, "tmp_obj_XXXXXX"); | |
1654 | fd = git_mkstemp_mode(tmp->buf, 0444); | |
1655 | if (fd < 0 && dirlen && errno == ENOENT) { | |
1656 | /* | |
1657 | * Make sure the directory exists; note that the contents | |
1658 | * of the buffer are undefined after mkstemp returns an | |
1659 | * error, so we have to rewrite the whole buffer from | |
1660 | * scratch. | |
1661 | */ | |
1662 | strbuf_reset(tmp); | |
1663 | strbuf_add(tmp, filename, dirlen - 1); | |
1664 | if (mkdir(tmp->buf, 0777) && errno != EEXIST) | |
1665 | return -1; | |
1666 | if (adjust_shared_perm(tmp->buf)) | |
1667 | return -1; | |
1668 | ||
1669 | /* Try again */ | |
1670 | strbuf_addstr(tmp, "/tmp_obj_XXXXXX"); | |
1671 | fd = git_mkstemp_mode(tmp->buf, 0444); | |
1672 | } | |
1673 | return fd; | |
1674 | } | |
1675 | ||
1676 | static int write_loose_object(const struct object_id *oid, char *hdr, | |
1677 | int hdrlen, const void *buf, unsigned long len, | |
1678 | time_t mtime) | |
1679 | { | |
1680 | int fd, ret; | |
1681 | unsigned char compressed[4096]; | |
1682 | git_zstream stream; | |
1683 | git_hash_ctx c; | |
1684 | struct object_id parano_oid; | |
1685 | static struct strbuf tmp_file = STRBUF_INIT; | |
1686 | static struct strbuf filename = STRBUF_INIT; | |
1687 | ||
1688 | loose_object_path(the_repository, &filename, oid); | |
1689 | ||
1690 | fd = create_tmpfile(&tmp_file, filename.buf); | |
1691 | if (fd < 0) { | |
1692 | if (errno == EACCES) | |
1693 | return error(_("insufficient permission for adding an object to repository database %s"), get_object_directory()); | |
1694 | else | |
1695 | return error_errno(_("unable to create temporary file")); | |
1696 | } | |
1697 | ||
1698 | /* Set it up */ | |
1699 | git_deflate_init(&stream, zlib_compression_level); | |
1700 | stream.next_out = compressed; | |
1701 | stream.avail_out = sizeof(compressed); | |
1702 | the_hash_algo->init_fn(&c); | |
1703 | ||
1704 | /* First header.. */ | |
1705 | stream.next_in = (unsigned char *)hdr; | |
1706 | stream.avail_in = hdrlen; | |
1707 | while (git_deflate(&stream, 0) == Z_OK) | |
1708 | ; /* nothing */ | |
1709 | the_hash_algo->update_fn(&c, hdr, hdrlen); | |
1710 | ||
1711 | /* Then the data itself.. */ | |
1712 | stream.next_in = (void *)buf; | |
1713 | stream.avail_in = len; | |
1714 | do { | |
1715 | unsigned char *in0 = stream.next_in; | |
1716 | ret = git_deflate(&stream, Z_FINISH); | |
1717 | the_hash_algo->update_fn(&c, in0, stream.next_in - in0); | |
1718 | if (write_buffer(fd, compressed, stream.next_out - compressed) < 0) | |
1719 | die(_("unable to write loose object file")); | |
1720 | stream.next_out = compressed; | |
1721 | stream.avail_out = sizeof(compressed); | |
1722 | } while (ret == Z_OK); | |
1723 | ||
1724 | if (ret != Z_STREAM_END) | |
1725 | die(_("unable to deflate new object %s (%d)"), oid_to_hex(oid), | |
1726 | ret); | |
1727 | ret = git_deflate_end_gently(&stream); | |
1728 | if (ret != Z_OK) | |
1729 | die(_("deflateEnd on object %s failed (%d)"), oid_to_hex(oid), | |
1730 | ret); | |
1731 | the_hash_algo->final_fn(parano_oid.hash, &c); | |
1732 | if (!oideq(oid, ¶no_oid)) | |
1733 | die(_("confused by unstable object source data for %s"), | |
1734 | oid_to_hex(oid)); | |
1735 | ||
1736 | close_loose_object(fd); | |
1737 | ||
1738 | if (mtime) { | |
1739 | struct utimbuf utb; | |
1740 | utb.actime = mtime; | |
1741 | utb.modtime = mtime; | |
1742 | if (utime(tmp_file.buf, &utb) < 0) | |
1743 | warning_errno(_("failed utime() on %s"), tmp_file.buf); | |
1744 | } | |
1745 | ||
1746 | return finalize_object_file(tmp_file.buf, filename.buf); | |
1747 | } | |
1748 | ||
1749 | static int freshen_loose_object(const struct object_id *oid) | |
1750 | { | |
1751 | return check_and_freshen(oid, 1); | |
1752 | } | |
1753 | ||
1754 | static int freshen_packed_object(const struct object_id *oid) | |
1755 | { | |
1756 | struct pack_entry e; | |
1757 | if (!find_pack_entry(the_repository, oid, &e)) | |
1758 | return 0; | |
1759 | if (e.p->freshened) | |
1760 | return 1; | |
1761 | if (!freshen_file(e.p->pack_name)) | |
1762 | return 0; | |
1763 | e.p->freshened = 1; | |
1764 | return 1; | |
1765 | } | |
1766 | ||
1767 | int write_object_file(const void *buf, unsigned long len, const char *type, | |
1768 | struct object_id *oid) | |
1769 | { | |
1770 | char hdr[MAX_HEADER_LEN]; | |
1771 | int hdrlen = sizeof(hdr); | |
1772 | ||
1773 | /* Normally if we have it in the pack then we do not bother writing | |
1774 | * it out into .git/objects/??/?{38} file. | |
1775 | */ | |
1776 | write_object_file_prepare(buf, len, type, oid, hdr, &hdrlen); | |
1777 | if (freshen_packed_object(oid) || freshen_loose_object(oid)) | |
1778 | return 0; | |
1779 | return write_loose_object(oid, hdr, hdrlen, buf, len, 0); | |
1780 | } | |
1781 | ||
1782 | int hash_object_file_literally(const void *buf, unsigned long len, | |
1783 | const char *type, struct object_id *oid, | |
1784 | unsigned flags) | |
1785 | { | |
1786 | char *header; | |
1787 | int hdrlen, status = 0; | |
1788 | ||
1789 | /* type string, SP, %lu of the length plus NUL must fit this */ | |
1790 | hdrlen = strlen(type) + MAX_HEADER_LEN; | |
1791 | header = xmalloc(hdrlen); | |
1792 | write_object_file_prepare(buf, len, type, oid, header, &hdrlen); | |
1793 | ||
1794 | if (!(flags & HASH_WRITE_OBJECT)) | |
1795 | goto cleanup; | |
1796 | if (freshen_packed_object(oid) || freshen_loose_object(oid)) | |
1797 | goto cleanup; | |
1798 | status = write_loose_object(oid, header, hdrlen, buf, len, 0); | |
1799 | ||
1800 | cleanup: | |
1801 | free(header); | |
1802 | return status; | |
1803 | } | |
1804 | ||
1805 | int force_object_loose(const struct object_id *oid, time_t mtime) | |
1806 | { | |
1807 | void *buf; | |
1808 | unsigned long len; | |
1809 | enum object_type type; | |
1810 | char hdr[MAX_HEADER_LEN]; | |
1811 | int hdrlen; | |
1812 | int ret; | |
1813 | ||
1814 | if (has_loose_object(oid)) | |
1815 | return 0; | |
1816 | buf = read_object(the_repository, oid, &type, &len); | |
1817 | if (!buf) | |
1818 | return error(_("cannot read object for %s"), oid_to_hex(oid)); | |
1819 | hdrlen = xsnprintf(hdr, sizeof(hdr), "%s %"PRIuMAX , type_name(type), (uintmax_t)len) + 1; | |
1820 | ret = write_loose_object(oid, hdr, hdrlen, buf, len, mtime); | |
1821 | free(buf); | |
1822 | ||
1823 | return ret; | |
1824 | } | |
1825 | ||
1826 | int repo_has_object_file_with_flags(struct repository *r, | |
1827 | const struct object_id *oid, int flags) | |
1828 | { | |
1829 | if (!startup_info->have_repository) | |
1830 | return 0; | |
1831 | return oid_object_info_extended(r, oid, NULL, | |
1832 | flags | OBJECT_INFO_SKIP_CACHED) >= 0; | |
1833 | } | |
1834 | ||
1835 | int repo_has_object_file(struct repository *r, | |
1836 | const struct object_id *oid) | |
1837 | { | |
1838 | return repo_has_object_file_with_flags(r, oid, 0); | |
1839 | } | |
1840 | ||
1841 | static void check_tree(const void *buf, size_t size) | |
1842 | { | |
1843 | struct tree_desc desc; | |
1844 | struct name_entry entry; | |
1845 | ||
1846 | init_tree_desc(&desc, buf, size); | |
1847 | while (tree_entry(&desc, &entry)) | |
1848 | /* do nothing | |
1849 | * tree_entry() will die() on malformed entries */ | |
1850 | ; | |
1851 | } | |
1852 | ||
1853 | static void check_commit(const void *buf, size_t size) | |
1854 | { | |
1855 | struct commit c; | |
1856 | memset(&c, 0, sizeof(c)); | |
1857 | if (parse_commit_buffer(the_repository, &c, buf, size, 0)) | |
1858 | die(_("corrupt commit")); | |
1859 | } | |
1860 | ||
1861 | static void check_tag(const void *buf, size_t size) | |
1862 | { | |
1863 | struct tag t; | |
1864 | memset(&t, 0, sizeof(t)); | |
1865 | if (parse_tag_buffer(the_repository, &t, buf, size)) | |
1866 | die(_("corrupt tag")); | |
1867 | } | |
1868 | ||
1869 | static int index_mem(struct index_state *istate, | |
1870 | struct object_id *oid, void *buf, size_t size, | |
1871 | enum object_type type, | |
1872 | const char *path, unsigned flags) | |
1873 | { | |
1874 | int ret, re_allocated = 0; | |
1875 | int write_object = flags & HASH_WRITE_OBJECT; | |
1876 | ||
1877 | if (!type) | |
1878 | type = OBJ_BLOB; | |
1879 | ||
1880 | /* | |
1881 | * Convert blobs to git internal format | |
1882 | */ | |
1883 | if ((type == OBJ_BLOB) && path) { | |
1884 | struct strbuf nbuf = STRBUF_INIT; | |
1885 | if (convert_to_git(istate, path, buf, size, &nbuf, | |
1886 | get_conv_flags(flags))) { | |
1887 | buf = strbuf_detach(&nbuf, &size); | |
1888 | re_allocated = 1; | |
1889 | } | |
1890 | } | |
1891 | if (flags & HASH_FORMAT_CHECK) { | |
1892 | if (type == OBJ_TREE) | |
1893 | check_tree(buf, size); | |
1894 | if (type == OBJ_COMMIT) | |
1895 | check_commit(buf, size); | |
1896 | if (type == OBJ_TAG) | |
1897 | check_tag(buf, size); | |
1898 | } | |
1899 | ||
1900 | if (write_object) | |
1901 | ret = write_object_file(buf, size, type_name(type), oid); | |
1902 | else | |
1903 | ret = hash_object_file(buf, size, type_name(type), oid); | |
1904 | if (re_allocated) | |
1905 | free(buf); | |
1906 | return ret; | |
1907 | } | |
1908 | ||
1909 | static int index_stream_convert_blob(struct index_state *istate, | |
1910 | struct object_id *oid, | |
1911 | int fd, | |
1912 | const char *path, | |
1913 | unsigned flags) | |
1914 | { | |
1915 | int ret; | |
1916 | const int write_object = flags & HASH_WRITE_OBJECT; | |
1917 | struct strbuf sbuf = STRBUF_INIT; | |
1918 | ||
1919 | assert(path); | |
1920 | assert(would_convert_to_git_filter_fd(istate, path)); | |
1921 | ||
1922 | convert_to_git_filter_fd(istate, path, fd, &sbuf, | |
1923 | get_conv_flags(flags)); | |
1924 | ||
1925 | if (write_object) | |
1926 | ret = write_object_file(sbuf.buf, sbuf.len, type_name(OBJ_BLOB), | |
1927 | oid); | |
1928 | else | |
1929 | ret = hash_object_file(sbuf.buf, sbuf.len, type_name(OBJ_BLOB), | |
1930 | oid); | |
1931 | strbuf_release(&sbuf); | |
1932 | return ret; | |
1933 | } | |
1934 | ||
1935 | static int index_pipe(struct index_state *istate, struct object_id *oid, | |
1936 | int fd, enum object_type type, | |
1937 | const char *path, unsigned flags) | |
1938 | { | |
1939 | struct strbuf sbuf = STRBUF_INIT; | |
1940 | int ret; | |
1941 | ||
1942 | if (strbuf_read(&sbuf, fd, 4096) >= 0) | |
1943 | ret = index_mem(istate, oid, sbuf.buf, sbuf.len, type, path, flags); | |
1944 | else | |
1945 | ret = -1; | |
1946 | strbuf_release(&sbuf); | |
1947 | return ret; | |
1948 | } | |
1949 | ||
1950 | #define SMALL_FILE_SIZE (32*1024) | |
1951 | ||
1952 | static int index_core(struct index_state *istate, | |
1953 | struct object_id *oid, int fd, size_t size, | |
1954 | enum object_type type, const char *path, | |
1955 | unsigned flags) | |
1956 | { | |
1957 | int ret; | |
1958 | ||
1959 | if (!size) { | |
1960 | ret = index_mem(istate, oid, "", size, type, path, flags); | |
1961 | } else if (size <= SMALL_FILE_SIZE) { | |
1962 | char *buf = xmalloc(size); | |
1963 | ssize_t read_result = read_in_full(fd, buf, size); | |
1964 | if (read_result < 0) | |
1965 | ret = error_errno(_("read error while indexing %s"), | |
1966 | path ? path : "<unknown>"); | |
1967 | else if (read_result != size) | |
1968 | ret = error(_("short read while indexing %s"), | |
1969 | path ? path : "<unknown>"); | |
1970 | else | |
1971 | ret = index_mem(istate, oid, buf, size, type, path, flags); | |
1972 | free(buf); | |
1973 | } else { | |
1974 | void *buf = xmmap(NULL, size, PROT_READ, MAP_PRIVATE, fd, 0); | |
1975 | ret = index_mem(istate, oid, buf, size, type, path, flags); | |
1976 | munmap(buf, size); | |
1977 | } | |
1978 | return ret; | |
1979 | } | |
1980 | ||
1981 | /* | |
1982 | * This creates one packfile per large blob unless bulk-checkin | |
1983 | * machinery is "plugged". | |
1984 | * | |
1985 | * This also bypasses the usual "convert-to-git" dance, and that is on | |
1986 | * purpose. We could write a streaming version of the converting | |
1987 | * functions and insert that before feeding the data to fast-import | |
1988 | * (or equivalent in-core API described above). However, that is | |
1989 | * somewhat complicated, as we do not know the size of the filter | |
1990 | * result, which we need to know beforehand when writing a git object. | |
1991 | * Since the primary motivation for trying to stream from the working | |
1992 | * tree file and to avoid mmaping it in core is to deal with large | |
1993 | * binary blobs, they generally do not want to get any conversion, and | |
1994 | * callers should avoid this code path when filters are requested. | |
1995 | */ | |
1996 | static int index_stream(struct object_id *oid, int fd, size_t size, | |
1997 | enum object_type type, const char *path, | |
1998 | unsigned flags) | |
1999 | { | |
2000 | return index_bulk_checkin(oid, fd, size, type, path, flags); | |
2001 | } | |
2002 | ||
2003 | int index_fd(struct index_state *istate, struct object_id *oid, | |
2004 | int fd, struct stat *st, | |
2005 | enum object_type type, const char *path, unsigned flags) | |
2006 | { | |
2007 | int ret; | |
2008 | ||
2009 | /* | |
2010 | * Call xsize_t() only when needed to avoid potentially unnecessary | |
2011 | * die() for large files. | |
2012 | */ | |
2013 | if (type == OBJ_BLOB && path && would_convert_to_git_filter_fd(istate, path)) | |
2014 | ret = index_stream_convert_blob(istate, oid, fd, path, flags); | |
2015 | else if (!S_ISREG(st->st_mode)) | |
2016 | ret = index_pipe(istate, oid, fd, type, path, flags); | |
2017 | else if (st->st_size <= big_file_threshold || type != OBJ_BLOB || | |
2018 | (path && would_convert_to_git(istate, path))) | |
2019 | ret = index_core(istate, oid, fd, xsize_t(st->st_size), | |
2020 | type, path, flags); | |
2021 | else | |
2022 | ret = index_stream(oid, fd, xsize_t(st->st_size), type, path, | |
2023 | flags); | |
2024 | close(fd); | |
2025 | return ret; | |
2026 | } | |
2027 | ||
2028 | int index_path(struct index_state *istate, struct object_id *oid, | |
2029 | const char *path, struct stat *st, unsigned flags) | |
2030 | { | |
2031 | int fd; | |
2032 | struct strbuf sb = STRBUF_INIT; | |
2033 | int rc = 0; | |
2034 | ||
2035 | switch (st->st_mode & S_IFMT) { | |
2036 | case S_IFREG: | |
2037 | fd = open(path, O_RDONLY); | |
2038 | if (fd < 0) | |
2039 | return error_errno("open(\"%s\")", path); | |
2040 | if (index_fd(istate, oid, fd, st, OBJ_BLOB, path, flags) < 0) | |
2041 | return error(_("%s: failed to insert into database"), | |
2042 | path); | |
2043 | break; | |
2044 | case S_IFLNK: | |
2045 | if (strbuf_readlink(&sb, path, st->st_size)) | |
2046 | return error_errno("readlink(\"%s\")", path); | |
2047 | if (!(flags & HASH_WRITE_OBJECT)) | |
2048 | hash_object_file(sb.buf, sb.len, blob_type, oid); | |
2049 | else if (write_object_file(sb.buf, sb.len, blob_type, oid)) | |
2050 | rc = error(_("%s: failed to insert into database"), path); | |
2051 | strbuf_release(&sb); | |
2052 | break; | |
2053 | case S_IFDIR: | |
2054 | return resolve_gitlink_ref(path, "HEAD", oid); | |
2055 | default: | |
2056 | return error(_("%s: unsupported file type"), path); | |
2057 | } | |
2058 | return rc; | |
2059 | } | |
2060 | ||
2061 | int read_pack_header(int fd, struct pack_header *header) | |
2062 | { | |
2063 | if (read_in_full(fd, header, sizeof(*header)) != sizeof(*header)) | |
2064 | /* "eof before pack header was fully read" */ | |
2065 | return PH_ERROR_EOF; | |
2066 | ||
2067 | if (header->hdr_signature != htonl(PACK_SIGNATURE)) | |
2068 | /* "protocol error (pack signature mismatch detected)" */ | |
2069 | return PH_ERROR_PACK_SIGNATURE; | |
2070 | if (!pack_version_ok(header->hdr_version)) | |
2071 | /* "protocol error (pack version unsupported)" */ | |
2072 | return PH_ERROR_PROTOCOL; | |
2073 | return 0; | |
2074 | } | |
2075 | ||
2076 | void assert_oid_type(const struct object_id *oid, enum object_type expect) | |
2077 | { | |
2078 | enum object_type type = oid_object_info(the_repository, oid, NULL); | |
2079 | if (type < 0) | |
2080 | die(_("%s is not a valid object"), oid_to_hex(oid)); | |
2081 | if (type != expect) | |
2082 | die(_("%s is not a valid '%s' object"), oid_to_hex(oid), | |
2083 | type_name(expect)); | |
2084 | } | |
2085 | ||
2086 | int for_each_file_in_obj_subdir(unsigned int subdir_nr, | |
2087 | struct strbuf *path, | |
2088 | each_loose_object_fn obj_cb, | |
2089 | each_loose_cruft_fn cruft_cb, | |
2090 | each_loose_subdir_fn subdir_cb, | |
2091 | void *data) | |
2092 | { | |
2093 | size_t origlen, baselen; | |
2094 | DIR *dir; | |
2095 | struct dirent *de; | |
2096 | int r = 0; | |
2097 | struct object_id oid; | |
2098 | ||
2099 | if (subdir_nr > 0xff) | |
2100 | BUG("invalid loose object subdirectory: %x", subdir_nr); | |
2101 | ||
2102 | origlen = path->len; | |
2103 | strbuf_complete(path, '/'); | |
2104 | strbuf_addf(path, "%02x", subdir_nr); | |
2105 | ||
2106 | dir = opendir(path->buf); | |
2107 | if (!dir) { | |
2108 | if (errno != ENOENT) | |
2109 | r = error_errno(_("unable to open %s"), path->buf); | |
2110 | strbuf_setlen(path, origlen); | |
2111 | return r; | |
2112 | } | |
2113 | ||
2114 | oid.hash[0] = subdir_nr; | |
2115 | strbuf_addch(path, '/'); | |
2116 | baselen = path->len; | |
2117 | ||
2118 | while ((de = readdir(dir))) { | |
2119 | size_t namelen; | |
2120 | if (is_dot_or_dotdot(de->d_name)) | |
2121 | continue; | |
2122 | ||
2123 | namelen = strlen(de->d_name); | |
2124 | strbuf_setlen(path, baselen); | |
2125 | strbuf_add(path, de->d_name, namelen); | |
2126 | if (namelen == the_hash_algo->hexsz - 2 && | |
2127 | !hex_to_bytes(oid.hash + 1, de->d_name, | |
2128 | the_hash_algo->rawsz - 1)) { | |
2129 | if (obj_cb) { | |
2130 | r = obj_cb(&oid, path->buf, data); | |
2131 | if (r) | |
2132 | break; | |
2133 | } | |
2134 | continue; | |
2135 | } | |
2136 | ||
2137 | if (cruft_cb) { | |
2138 | r = cruft_cb(de->d_name, path->buf, data); | |
2139 | if (r) | |
2140 | break; | |
2141 | } | |
2142 | } | |
2143 | closedir(dir); | |
2144 | ||
2145 | strbuf_setlen(path, baselen - 1); | |
2146 | if (!r && subdir_cb) | |
2147 | r = subdir_cb(subdir_nr, path->buf, data); | |
2148 | ||
2149 | strbuf_setlen(path, origlen); | |
2150 | ||
2151 | return r; | |
2152 | } | |
2153 | ||
2154 | int for_each_loose_file_in_objdir_buf(struct strbuf *path, | |
2155 | each_loose_object_fn obj_cb, | |
2156 | each_loose_cruft_fn cruft_cb, | |
2157 | each_loose_subdir_fn subdir_cb, | |
2158 | void *data) | |
2159 | { | |
2160 | int r = 0; | |
2161 | int i; | |
2162 | ||
2163 | for (i = 0; i < 256; i++) { | |
2164 | r = for_each_file_in_obj_subdir(i, path, obj_cb, cruft_cb, | |
2165 | subdir_cb, data); | |
2166 | if (r) | |
2167 | break; | |
2168 | } | |
2169 | ||
2170 | return r; | |
2171 | } | |
2172 | ||
2173 | int for_each_loose_file_in_objdir(const char *path, | |
2174 | each_loose_object_fn obj_cb, | |
2175 | each_loose_cruft_fn cruft_cb, | |
2176 | each_loose_subdir_fn subdir_cb, | |
2177 | void *data) | |
2178 | { | |
2179 | struct strbuf buf = STRBUF_INIT; | |
2180 | int r; | |
2181 | ||
2182 | strbuf_addstr(&buf, path); | |
2183 | r = for_each_loose_file_in_objdir_buf(&buf, obj_cb, cruft_cb, | |
2184 | subdir_cb, data); | |
2185 | strbuf_release(&buf); | |
2186 | ||
2187 | return r; | |
2188 | } | |
2189 | ||
2190 | int for_each_loose_object(each_loose_object_fn cb, void *data, | |
2191 | enum for_each_object_flags flags) | |
2192 | { | |
2193 | struct object_directory *odb; | |
2194 | ||
2195 | prepare_alt_odb(the_repository); | |
2196 | for (odb = the_repository->objects->odb; odb; odb = odb->next) { | |
2197 | int r = for_each_loose_file_in_objdir(odb->path, cb, NULL, | |
2198 | NULL, data); | |
2199 | if (r) | |
2200 | return r; | |
2201 | ||
2202 | if (flags & FOR_EACH_OBJECT_LOCAL_ONLY) | |
2203 | break; | |
2204 | } | |
2205 | ||
2206 | return 0; | |
2207 | } | |
2208 | ||
2209 | static int append_loose_object(const struct object_id *oid, const char *path, | |
2210 | void *data) | |
2211 | { | |
2212 | oid_array_append(data, oid); | |
2213 | return 0; | |
2214 | } | |
2215 | ||
2216 | struct oid_array *odb_loose_cache(struct object_directory *odb, | |
2217 | const struct object_id *oid) | |
2218 | { | |
2219 | int subdir_nr = oid->hash[0]; | |
2220 | struct strbuf buf = STRBUF_INIT; | |
2221 | ||
2222 | if (subdir_nr < 0 || | |
2223 | subdir_nr >= ARRAY_SIZE(odb->loose_objects_subdir_seen)) | |
2224 | BUG("subdir_nr out of range"); | |
2225 | ||
2226 | if (odb->loose_objects_subdir_seen[subdir_nr]) | |
2227 | return &odb->loose_objects_cache[subdir_nr]; | |
2228 | ||
2229 | strbuf_addstr(&buf, odb->path); | |
2230 | for_each_file_in_obj_subdir(subdir_nr, &buf, | |
2231 | append_loose_object, | |
2232 | NULL, NULL, | |
2233 | &odb->loose_objects_cache[subdir_nr]); | |
2234 | odb->loose_objects_subdir_seen[subdir_nr] = 1; | |
2235 | strbuf_release(&buf); | |
2236 | return &odb->loose_objects_cache[subdir_nr]; | |
2237 | } | |
2238 | ||
2239 | void odb_clear_loose_cache(struct object_directory *odb) | |
2240 | { | |
2241 | int i; | |
2242 | ||
2243 | for (i = 0; i < ARRAY_SIZE(odb->loose_objects_cache); i++) | |
2244 | oid_array_clear(&odb->loose_objects_cache[i]); | |
2245 | memset(&odb->loose_objects_subdir_seen, 0, | |
2246 | sizeof(odb->loose_objects_subdir_seen)); | |
2247 | } | |
2248 | ||
2249 | static int check_stream_oid(git_zstream *stream, | |
2250 | const char *hdr, | |
2251 | unsigned long size, | |
2252 | const char *path, | |
2253 | const struct object_id *expected_oid) | |
2254 | { | |
2255 | git_hash_ctx c; | |
2256 | struct object_id real_oid; | |
2257 | unsigned char buf[4096]; | |
2258 | unsigned long total_read; | |
2259 | int status = Z_OK; | |
2260 | ||
2261 | the_hash_algo->init_fn(&c); | |
2262 | the_hash_algo->update_fn(&c, hdr, stream->total_out); | |
2263 | ||
2264 | /* | |
2265 | * We already read some bytes into hdr, but the ones up to the NUL | |
2266 | * do not count against the object's content size. | |
2267 | */ | |
2268 | total_read = stream->total_out - strlen(hdr) - 1; | |
2269 | ||
2270 | /* | |
2271 | * This size comparison must be "<=" to read the final zlib packets; | |
2272 | * see the comment in unpack_loose_rest for details. | |
2273 | */ | |
2274 | while (total_read <= size && | |
2275 | (status == Z_OK || | |
2276 | (status == Z_BUF_ERROR && !stream->avail_out))) { | |
2277 | stream->next_out = buf; | |
2278 | stream->avail_out = sizeof(buf); | |
2279 | if (size - total_read < stream->avail_out) | |
2280 | stream->avail_out = size - total_read; | |
2281 | status = git_inflate(stream, Z_FINISH); | |
2282 | the_hash_algo->update_fn(&c, buf, stream->next_out - buf); | |
2283 | total_read += stream->next_out - buf; | |
2284 | } | |
2285 | git_inflate_end(stream); | |
2286 | ||
2287 | if (status != Z_STREAM_END) { | |
2288 | error(_("corrupt loose object '%s'"), oid_to_hex(expected_oid)); | |
2289 | return -1; | |
2290 | } | |
2291 | if (stream->avail_in) { | |
2292 | error(_("garbage at end of loose object '%s'"), | |
2293 | oid_to_hex(expected_oid)); | |
2294 | return -1; | |
2295 | } | |
2296 | ||
2297 | the_hash_algo->final_fn(real_oid.hash, &c); | |
2298 | if (!oideq(expected_oid, &real_oid)) { | |
2299 | error(_("hash mismatch for %s (expected %s)"), path, | |
2300 | oid_to_hex(expected_oid)); | |
2301 | return -1; | |
2302 | } | |
2303 | ||
2304 | return 0; | |
2305 | } | |
2306 | ||
2307 | int read_loose_object(const char *path, | |
2308 | const struct object_id *expected_oid, | |
2309 | enum object_type *type, | |
2310 | unsigned long *size, | |
2311 | void **contents) | |
2312 | { | |
2313 | int ret = -1; | |
2314 | void *map = NULL; | |
2315 | unsigned long mapsize; | |
2316 | git_zstream stream; | |
2317 | char hdr[MAX_HEADER_LEN]; | |
2318 | ||
2319 | *contents = NULL; | |
2320 | ||
2321 | map = map_loose_object_1(the_repository, path, NULL, &mapsize); | |
2322 | if (!map) { | |
2323 | error_errno(_("unable to mmap %s"), path); | |
2324 | goto out; | |
2325 | } | |
2326 | ||
2327 | if (unpack_loose_header(&stream, map, mapsize, hdr, sizeof(hdr)) < 0) { | |
2328 | error(_("unable to unpack header of %s"), path); | |
2329 | goto out; | |
2330 | } | |
2331 | ||
2332 | *type = parse_loose_header(hdr, size); | |
2333 | if (*type < 0) { | |
2334 | error(_("unable to parse header of %s"), path); | |
2335 | git_inflate_end(&stream); | |
2336 | goto out; | |
2337 | } | |
2338 | ||
2339 | if (*type == OBJ_BLOB && *size > big_file_threshold) { | |
2340 | if (check_stream_oid(&stream, hdr, *size, path, expected_oid) < 0) | |
2341 | goto out; | |
2342 | } else { | |
2343 | *contents = unpack_loose_rest(&stream, hdr, *size, expected_oid); | |
2344 | if (!*contents) { | |
2345 | error(_("unable to unpack contents of %s"), path); | |
2346 | git_inflate_end(&stream); | |
2347 | goto out; | |
2348 | } | |
2349 | if (check_object_signature(expected_oid, *contents, | |
2350 | *size, type_name(*type))) { | |
2351 | error(_("hash mismatch for %s (expected %s)"), path, | |
2352 | oid_to_hex(expected_oid)); | |
2353 | free(*contents); | |
2354 | goto out; | |
2355 | } | |
2356 | } | |
2357 | ||
2358 | ret = 0; /* everything checks out */ | |
2359 | ||
2360 | out: | |
2361 | if (map) | |
2362 | munmap(map, mapsize); | |
2363 | return ret; | |
2364 | } |