]>
Commit | Line | Data |
---|---|---|
0fcfd160 LT |
1 | /* |
2 | * GIT - The information manager from hell | |
3 | * | |
4 | * Copyright (C) Linus Torvalds, 2005 | |
5 | * | |
e5afd444 | 6 | * This handles basic git object files - packing, unpacking, |
0fcfd160 LT |
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" |
bc626927 | 23 | #include "hash-lookup.h" |
568508e7 | 24 | #include "bulk-checkin.h" |
031dc927 | 25 | #include "repository.h" |
47f351e9 | 26 | #include "replace-object.h" |
090ea126 | 27 | #include "streaming.h" |
543c5caa | 28 | #include "dir.h" |
12d95ef6 | 29 | #include "list.h" |
c4c6effa | 30 | #include "mergesort.h" |
cf3c6352 | 31 | #include "quote.h" |
4f39cd82 | 32 | #include "packfile.h" |
90c62155 | 33 | #include "object-store.h" |
b14ed5ad | 34 | #include "promisor-remote.h" |
e05db0fd | 35 | |
1af64f73 | 36 | /* The maximum size for an object header. */ |
37 | #define MAX_HEADER_LEN 32 | |
38 | ||
e1ccd7e2 | 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" | |
13eeedb5 | 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" | |
e1ccd7e2 | 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" | |
13eeedb5 | 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" | |
e1ccd7e2 | 57 | |
3e56e724 | 58 | const struct object_id null_oid; |
e1ccd7e2 | 59 | static const struct object_id empty_tree_oid = { |
8576fde6 JK |
60 | EMPTY_TREE_SHA1_BIN_LITERAL |
61 | }; | |
e1ccd7e2 | 62 | static const struct object_id empty_blob_oid = { |
8576fde6 JK |
63 | EMPTY_BLOB_SHA1_BIN_LITERAL |
64 | }; | |
13eeedb5 | 65 | static const struct object_id empty_tree_oid_sha256 = { |
66 | EMPTY_TREE_SHA256_BIN_LITERAL | |
67 | }; | |
68 | static const struct object_id empty_blob_oid_sha256 = { | |
69 | EMPTY_BLOB_SHA256_BIN_LITERAL | |
70 | }; | |
88cd621d | 71 | |
ac73cedf | 72 | static void git_hash_sha1_init(git_hash_ctx *ctx) |
f50e766b | 73 | { |
ac73cedf | 74 | git_SHA1_Init(&ctx->sha1); |
f50e766b | 75 | } |
76 | ||
768e30ea | 77 | static void git_hash_sha1_clone(git_hash_ctx *dst, const git_hash_ctx *src) |
78 | { | |
79 | git_SHA1_Clone(&dst->sha1, &src->sha1); | |
80 | } | |
81 | ||
ac73cedf | 82 | static void git_hash_sha1_update(git_hash_ctx *ctx, const void *data, size_t len) |
f50e766b | 83 | { |
ac73cedf | 84 | git_SHA1_Update(&ctx->sha1, data, len); |
f50e766b | 85 | } |
86 | ||
ac73cedf | 87 | static void git_hash_sha1_final(unsigned char *hash, git_hash_ctx *ctx) |
f50e766b | 88 | { |
ac73cedf | 89 | git_SHA1_Final(hash, &ctx->sha1); |
f50e766b | 90 | } |
91 | ||
13eeedb5 | 92 | |
93 | static void git_hash_sha256_init(git_hash_ctx *ctx) | |
94 | { | |
95 | git_SHA256_Init(&ctx->sha256); | |
96 | } | |
97 | ||
768e30ea | 98 | static void git_hash_sha256_clone(git_hash_ctx *dst, const git_hash_ctx *src) |
99 | { | |
100 | git_SHA256_Clone(&dst->sha256, &src->sha256); | |
101 | } | |
102 | ||
13eeedb5 | 103 | static void git_hash_sha256_update(git_hash_ctx *ctx, const void *data, size_t len) |
104 | { | |
105 | git_SHA256_Update(&ctx->sha256, data, len); | |
106 | } | |
107 | ||
108 | static void git_hash_sha256_final(unsigned char *hash, git_hash_ctx *ctx) | |
109 | { | |
110 | git_SHA256_Final(hash, &ctx->sha256); | |
111 | } | |
112 | ||
ac73cedf | 113 | static void git_hash_unknown_init(git_hash_ctx *ctx) |
f50e766b | 114 | { |
1a07e59c | 115 | BUG("trying to init unknown hash"); |
f50e766b | 116 | } |
117 | ||
768e30ea | 118 | static void git_hash_unknown_clone(git_hash_ctx *dst, const git_hash_ctx *src) |
119 | { | |
120 | BUG("trying to clone unknown hash"); | |
121 | } | |
122 | ||
ac73cedf | 123 | static void git_hash_unknown_update(git_hash_ctx *ctx, const void *data, size_t len) |
f50e766b | 124 | { |
1a07e59c | 125 | BUG("trying to update unknown hash"); |
f50e766b | 126 | } |
127 | ||
ac73cedf | 128 | static void git_hash_unknown_final(unsigned char *hash, git_hash_ctx *ctx) |
f50e766b | 129 | { |
1a07e59c | 130 | BUG("trying to finalize unknown hash"); |
f50e766b | 131 | } |
132 | ||
133 | const struct git_hash_algo hash_algos[GIT_HASH_NALGOS] = { | |
134 | { | |
135 | NULL, | |
136 | 0x00000000, | |
137 | 0, | |
138 | 0, | |
a2ce0a75 | 139 | 0, |
f50e766b | 140 | git_hash_unknown_init, |
768e30ea | 141 | git_hash_unknown_clone, |
f50e766b | 142 | git_hash_unknown_update, |
143 | git_hash_unknown_final, | |
144 | NULL, | |
145 | NULL, | |
146 | }, | |
147 | { | |
1ccf07cb | 148 | "sha1", |
f50e766b | 149 | /* "sha1", big-endian */ |
150 | 0x73686131, | |
f50e766b | 151 | GIT_SHA1_RAWSZ, |
152 | GIT_SHA1_HEXSZ, | |
a2ce0a75 | 153 | GIT_SHA1_BLKSZ, |
f50e766b | 154 | git_hash_sha1_init, |
768e30ea | 155 | git_hash_sha1_clone, |
f50e766b | 156 | git_hash_sha1_update, |
157 | git_hash_sha1_final, | |
158 | &empty_tree_oid, | |
159 | &empty_blob_oid, | |
160 | }, | |
13eeedb5 | 161 | { |
162 | "sha256", | |
163 | /* "s256", big-endian */ | |
164 | 0x73323536, | |
165 | GIT_SHA256_RAWSZ, | |
166 | GIT_SHA256_HEXSZ, | |
167 | GIT_SHA256_BLKSZ, | |
168 | git_hash_sha256_init, | |
768e30ea | 169 | git_hash_sha256_clone, |
13eeedb5 | 170 | git_hash_sha256_update, |
171 | git_hash_sha256_final, | |
172 | &empty_tree_oid_sha256, | |
173 | &empty_blob_oid_sha256, | |
174 | } | |
f50e766b | 175 | }; |
176 | ||
d8a92ced | 177 | const char *empty_tree_oid_hex(void) |
178 | { | |
179 | static char buf[GIT_MAX_HEXSZ + 1]; | |
180 | return oid_to_hex_r(buf, the_hash_algo->empty_tree); | |
181 | } | |
182 | ||
183 | const char *empty_blob_oid_hex(void) | |
184 | { | |
185 | static char buf[GIT_MAX_HEXSZ + 1]; | |
186 | return oid_to_hex_r(buf, the_hash_algo->empty_blob); | |
187 | } | |
188 | ||
2f90b9d9 | 189 | int hash_algo_by_name(const char *name) |
190 | { | |
191 | int i; | |
192 | if (!name) | |
193 | return GIT_HASH_UNKNOWN; | |
194 | for (i = 1; i < GIT_HASH_NALGOS; i++) | |
195 | if (!strcmp(name, hash_algos[i].name)) | |
196 | return i; | |
197 | return GIT_HASH_UNKNOWN; | |
198 | } | |
199 | ||
200 | int hash_algo_by_id(uint32_t format_id) | |
201 | { | |
202 | int i; | |
203 | for (i = 1; i < GIT_HASH_NALGOS; i++) | |
204 | if (format_id == hash_algos[i].format_id) | |
205 | return i; | |
206 | return GIT_HASH_UNKNOWN; | |
207 | } | |
208 | ||
95399788 | 209 | int hash_algo_by_length(int len) |
210 | { | |
211 | int i; | |
212 | for (i = 1; i < GIT_HASH_NALGOS; i++) | |
213 | if (len == hash_algos[i].rawsz) | |
214 | return i; | |
215 | return GIT_HASH_UNKNOWN; | |
216 | } | |
2f90b9d9 | 217 | |
c597ba80 NTND |
218 | /* |
219 | * This is meant to hold a *small* number of objects that you would | |
cb1c8d1d | 220 | * want read_object_file() to be able to return, but yet you do not want |
c597ba80 NTND |
221 | * to write them into the object store (e.g. a browse-only |
222 | * application). | |
223 | */ | |
224 | static struct cached_object { | |
62ba93ea | 225 | struct object_id oid; |
c597ba80 NTND |
226 | enum object_type type; |
227 | void *buf; | |
228 | unsigned long size; | |
229 | } *cached_objects; | |
230 | static int cached_object_nr, cached_object_alloc; | |
231 | ||
232 | static struct cached_object empty_tree = { | |
62ba93ea | 233 | { EMPTY_TREE_SHA1_BIN_LITERAL }, |
c597ba80 NTND |
234 | OBJ_TREE, |
235 | "", | |
236 | 0 | |
237 | }; | |
238 | ||
62ba93ea | 239 | static struct cached_object *find_cached_object(const struct object_id *oid) |
c597ba80 NTND |
240 | { |
241 | int i; | |
242 | struct cached_object *co = cached_objects; | |
243 | ||
244 | for (i = 0; i < cached_object_nr; i++, co++) { | |
4a7e27e9 | 245 | if (oideq(&co->oid, oid)) |
c597ba80 NTND |
246 | return co; |
247 | } | |
4a7e27e9 | 248 | if (oideq(oid, the_hash_algo->empty_tree)) |
c597ba80 NTND |
249 | return &empty_tree; |
250 | return NULL; | |
251 | } | |
252 | ||
9472935d | 253 | |
8462ff43 | 254 | static int get_conv_flags(unsigned flags) |
9472935d TB |
255 | { |
256 | if (flags & HASH_RENORMALIZE) | |
8462ff43 | 257 | return CONV_EOL_RENORMALIZE; |
9472935d | 258 | else if (flags & HASH_WRITE_OBJECT) |
107642fe | 259 | return global_conv_flags_eol | CONV_WRITE_OBJECT; |
9472935d | 260 | else |
8462ff43 | 261 | return 0; |
9472935d TB |
262 | } |
263 | ||
264 | ||
90a6464b JH |
265 | int mkdir_in_gitdir(const char *path) |
266 | { | |
267 | if (mkdir(path, 0777)) { | |
268 | int saved_errno = errno; | |
269 | struct stat st; | |
270 | struct strbuf sb = STRBUF_INIT; | |
271 | ||
272 | if (errno != EEXIST) | |
273 | return -1; | |
274 | /* | |
275 | * Are we looking at a path in a symlinked worktree | |
276 | * whose original repository does not yet have it? | |
277 | * e.g. .git/rr-cache pointing at its original | |
278 | * repository in which the user hasn't performed any | |
279 | * conflict resolution yet? | |
280 | */ | |
281 | if (lstat(path, &st) || !S_ISLNK(st.st_mode) || | |
282 | strbuf_readlink(&sb, path, st.st_size) || | |
283 | !is_absolute_path(sb.buf) || | |
284 | mkdir(sb.buf, 0777)) { | |
285 | strbuf_release(&sb); | |
286 | errno = saved_errno; | |
287 | return -1; | |
288 | } | |
289 | strbuf_release(&sb); | |
290 | } | |
291 | return adjust_shared_perm(path); | |
292 | } | |
293 | ||
eb3c027e | 294 | static enum scld_error safe_create_leading_directories_1(char *path, int share) |
b2cb9425 | 295 | { |
26c8ae2a | 296 | char *next_component = path + offset_1st_component(path); |
0be0521b | 297 | enum scld_error ret = SCLD_OK; |
67d42212 | 298 | |
0be0521b | 299 | while (ret == SCLD_OK && next_component) { |
f0502332 | 300 | struct stat st; |
0f527403 | 301 | char *slash = next_component, slash_character; |
f0502332 | 302 | |
0f527403 MH |
303 | while (*slash && !is_dir_sep(*slash)) |
304 | slash++; | |
305 | ||
306 | if (!*slash) | |
b2cb9425 | 307 | break; |
bf10cf70 | 308 | |
26c8ae2a | 309 | next_component = slash + 1; |
0f527403 | 310 | while (is_dir_sep(*next_component)) |
bf10cf70 | 311 | next_component++; |
26c8ae2a | 312 | if (!*next_component) |
5f0bdf50 | 313 | break; |
831651fd | 314 | |
0f527403 | 315 | slash_character = *slash; |
831651fd | 316 | *slash = '\0'; |
67d42212 JR |
317 | if (!stat(path, &st)) { |
318 | /* path exists */ | |
204a047f MH |
319 | if (!S_ISDIR(st.st_mode)) { |
320 | errno = ENOTDIR; | |
0be0521b | 321 | ret = SCLD_EXISTS; |
204a047f | 322 | } |
53a39721 | 323 | } else if (mkdir(path, 0777)) { |
928734d9 | 324 | if (errno == EEXIST && |
9e6f885d | 325 | !stat(path, &st) && S_ISDIR(st.st_mode)) |
928734d9 | 326 | ; /* somebody created it since we checked */ |
18d37e86 MH |
327 | else if (errno == ENOENT) |
328 | /* | |
329 | * Either mkdir() failed because | |
330 | * somebody just pruned the containing | |
331 | * directory, or stat() failed because | |
332 | * the file that was in our way was | |
333 | * just removed. Either way, inform | |
334 | * the caller that it might be worth | |
335 | * trying again: | |
336 | */ | |
337 | ret = SCLD_VANISHED; | |
9e6f885d | 338 | else |
0be0521b | 339 | ret = SCLD_FAILED; |
eb3c027e | 340 | } else if (share && adjust_shared_perm(path)) { |
0be0521b | 341 | ret = SCLD_PERMS; |
457f06d6 | 342 | } |
0f527403 | 343 | *slash = slash_character; |
b2cb9425 | 344 | } |
9e6f885d | 345 | return ret; |
b2cb9425 | 346 | } |
723c31fe | 347 | |
eb3c027e MT |
348 | enum scld_error safe_create_leading_directories(char *path) |
349 | { | |
350 | return safe_create_leading_directories_1(path, 1); | |
351 | } | |
352 | ||
353 | enum scld_error safe_create_leading_directories_no_share(char *path) | |
354 | { | |
355 | return safe_create_leading_directories_1(path, 0); | |
356 | } | |
357 | ||
0be0521b | 358 | enum scld_error safe_create_leading_directories_const(const char *path) |
8e21d63b | 359 | { |
02944307 | 360 | int save_errno; |
8e21d63b JK |
361 | /* path points to cache entries, so xstrdup before messing with it */ |
362 | char *buf = xstrdup(path); | |
0be0521b | 363 | enum scld_error result = safe_create_leading_directories(buf); |
02944307 MH |
364 | |
365 | save_errno = errno; | |
8e21d63b | 366 | free(buf); |
02944307 | 367 | errno = save_errno; |
8e21d63b JK |
368 | return result; |
369 | } | |
370 | ||
177978f5 MH |
371 | int raceproof_create_file(const char *path, create_file_fn fn, void *cb) |
372 | { | |
373 | /* | |
374 | * The number of times we will try to remove empty directories | |
375 | * in the way of path. This is only 1 because if another | |
376 | * process is racily creating directories that conflict with | |
377 | * us, we don't want to fight against them. | |
378 | */ | |
379 | int remove_directories_remaining = 1; | |
380 | ||
381 | /* | |
382 | * The number of times that we will try to create the | |
383 | * directories containing path. We are willing to attempt this | |
384 | * more than once, because another process could be trying to | |
385 | * clean up empty directories at the same time as we are | |
386 | * trying to create them. | |
387 | */ | |
388 | int create_directories_remaining = 3; | |
389 | ||
390 | /* A scratch copy of path, filled lazily if we need it: */ | |
391 | struct strbuf path_copy = STRBUF_INIT; | |
392 | ||
393 | int ret, save_errno; | |
394 | ||
395 | /* Sanity check: */ | |
396 | assert(*path); | |
397 | ||
398 | retry_fn: | |
399 | ret = fn(path, cb); | |
400 | save_errno = errno; | |
401 | if (!ret) | |
402 | goto out; | |
403 | ||
404 | if (errno == EISDIR && remove_directories_remaining-- > 0) { | |
405 | /* | |
406 | * A directory is in the way. Maybe it is empty; try | |
407 | * to remove it: | |
408 | */ | |
409 | if (!path_copy.len) | |
410 | strbuf_addstr(&path_copy, path); | |
411 | ||
412 | if (!remove_dir_recursively(&path_copy, REMOVE_DIR_EMPTY_ONLY)) | |
413 | goto retry_fn; | |
414 | } else if (errno == ENOENT && create_directories_remaining-- > 0) { | |
415 | /* | |
416 | * Maybe the containing directory didn't exist, or | |
417 | * maybe it was just deleted by a process that is | |
418 | * racing with us to clean up empty directories. Try | |
419 | * to create it: | |
420 | */ | |
421 | enum scld_error scld_result; | |
422 | ||
423 | if (!path_copy.len) | |
424 | strbuf_addstr(&path_copy, path); | |
425 | ||
426 | do { | |
427 | scld_result = safe_create_leading_directories(path_copy.buf); | |
428 | if (scld_result == SCLD_OK) | |
429 | goto retry_fn; | |
430 | } while (scld_result == SCLD_VANISHED && create_directories_remaining-- > 0); | |
431 | } | |
432 | ||
433 | out: | |
434 | strbuf_release(&path_copy); | |
435 | errno = save_errno; | |
436 | return ret; | |
437 | } | |
438 | ||
514c5fdd | 439 | static void fill_loose_path(struct strbuf *buf, const struct object_id *oid) |
ace1534d JH |
440 | { |
441 | int i; | |
94b5e093 | 442 | for (i = 0; i < the_hash_algo->rawsz; i++) { |
ace1534d | 443 | static char hex[] = "0123456789abcdef"; |
514c5fdd | 444 | unsigned int val = oid->hash[i]; |
f7b7774f JK |
445 | strbuf_addch(buf, hex[val >> 4]); |
446 | strbuf_addch(buf, hex[val & 0xf]); | |
afbba2f0 | 447 | if (!i) |
f7b7774f | 448 | strbuf_addch(buf, '/'); |
ace1534d JH |
449 | } |
450 | } | |
451 | ||
f0eaf638 JK |
452 | static const char *odb_loose_path(struct object_directory *odb, |
453 | struct strbuf *buf, | |
514c5fdd | 454 | const struct object_id *oid) |
0fcfd160 | 455 | { |
b69fb867 | 456 | strbuf_reset(buf); |
f0eaf638 | 457 | strbuf_addstr(buf, odb->path); |
34498471 | 458 | strbuf_addch(buf, '/'); |
514c5fdd | 459 | fill_loose_path(buf, oid); |
f3f043a1 | 460 | return buf->buf; |
0fcfd160 LT |
461 | } |
462 | ||
f3f043a1 | 463 | const char *loose_object_path(struct repository *r, struct strbuf *buf, |
514c5fdd | 464 | const struct object_id *oid) |
29ec6af2 | 465 | { |
514c5fdd | 466 | return odb_loose_path(r->objects->odb, buf, oid); |
0fcfd160 LT |
467 | } |
468 | ||
4ea82473 JK |
469 | /* |
470 | * Return non-zero iff the path is usable as an alternate object database. | |
471 | */ | |
13313fc3 SB |
472 | static int alt_odb_usable(struct raw_object_store *o, |
473 | struct strbuf *path, | |
474 | const char *normalized_objdir) | |
4ea82473 | 475 | { |
263db403 | 476 | struct object_directory *odb; |
4ea82473 JK |
477 | |
478 | /* Detect cases where alternate disappeared */ | |
479 | if (!is_directory(path->buf)) { | |
259328b7 NTND |
480 | error(_("object directory %s does not exist; " |
481 | "check .git/objects/info/alternates"), | |
4ea82473 JK |
482 | path->buf); |
483 | return 0; | |
484 | } | |
485 | ||
486 | /* | |
487 | * Prevent the common mistake of listing the same | |
488 | * thing twice, or object directory itself. | |
489 | */ | |
f0eaf638 | 490 | for (odb = o->odb; odb; odb = odb->next) { |
263db403 | 491 | if (!fspathcmp(path->buf, odb->path)) |
4ea82473 JK |
492 | return 0; |
493 | } | |
494 | if (!fspathcmp(path->buf, normalized_objdir)) | |
495 | return 0; | |
496 | ||
497 | return 1; | |
498 | } | |
499 | ||
ddd5d056 JH |
500 | /* |
501 | * Prepare alternate object database registry. | |
d5a63b99 JH |
502 | * |
503 | * The variable alt_odb_list points at the list of struct | |
263db403 | 504 | * object_directory. The elements on this list come from |
d5a63b99 JH |
505 | * non-empty elements from colon separated ALTERNATE_DB_ENVIRONMENT |
506 | * environment variable, and $GIT_OBJECT_DIRECTORY/info/alternates, | |
1494e038 JH |
507 | * whose contents is similar to that environment variable but can be |
508 | * LF separated. Its base points at a statically allocated buffer that | |
d5a63b99 JH |
509 | * contains "/the/directory/corresponding/to/.git/objects/...", while |
510 | * its name points just after the slash at the end of ".git/objects/" | |
e5afd444 MÅ |
511 | * in the example above, and has enough space to hold all hex characters |
512 | * of the object ID, an extra slash for the first level indirection, and | |
513 | * the terminating NUL. | |
ddd5d056 | 514 | */ |
77f012e8 SB |
515 | static void read_info_alternates(struct repository *r, |
516 | const char *relative_base, | |
517 | int depth); | |
518 | static int link_alt_odb_entry(struct repository *r, const char *entry, | |
cfc62fc9 | 519 | const char *relative_base, int depth, const char *normalized_objdir) |
ace1534d | 520 | { |
263db403 | 521 | struct object_directory *ent; |
5bdf0a84 | 522 | struct strbuf pathbuf = STRBUF_INIT; |
d5a63b99 | 523 | |
85dadc38 | 524 | if (!is_absolute_path(entry) && relative_base) { |
4ac9006f | 525 | strbuf_realpath(&pathbuf, relative_base, 1); |
5bdf0a84 | 526 | strbuf_addch(&pathbuf, '/'); |
c2f493a4 | 527 | } |
6eac50d8 | 528 | strbuf_addstr(&pathbuf, entry); |
c2f493a4 | 529 | |
37a95862 | 530 | if (strbuf_normalize_path(&pathbuf) < 0 && relative_base) { |
259328b7 | 531 | error(_("unable to normalize alternate object path: %s"), |
670c359d JK |
532 | pathbuf.buf); |
533 | strbuf_release(&pathbuf); | |
534 | return -1; | |
535 | } | |
5bdf0a84 HW |
536 | |
537 | /* | |
538 | * The trailing slash after the directory name is given by | |
539 | * this function at the end. Remove duplicates. | |
540 | */ | |
4ea82473 JK |
541 | while (pathbuf.len && pathbuf.buf[pathbuf.len - 1] == '/') |
542 | strbuf_setlen(&pathbuf, pathbuf.len - 1); | |
5bdf0a84 | 543 | |
77f012e8 | 544 | if (!alt_odb_usable(r->objects, &pathbuf, normalized_objdir)) { |
4ea82473 | 545 | strbuf_release(&pathbuf); |
c2f493a4 MW |
546 | return -1; |
547 | } | |
548 | ||
f0eaf638 JK |
549 | ent = xcalloc(1, sizeof(*ent)); |
550 | ent->path = xstrdup(pathbuf.buf); | |
c2f493a4 MW |
551 | |
552 | /* add the alternate entry */ | |
f0eaf638 JK |
553 | *r->objects->odb_tail = ent; |
554 | r->objects->odb_tail = &(ent->next); | |
c2f493a4 MW |
555 | ent->next = NULL; |
556 | ||
557 | /* recursively add alternates */ | |
77f012e8 | 558 | read_info_alternates(r, pathbuf.buf, depth + 1); |
c2f493a4 | 559 | |
4ea82473 | 560 | strbuf_release(&pathbuf); |
c2f493a4 MW |
561 | return 0; |
562 | } | |
563 | ||
cf3c6352 JK |
564 | static const char *parse_alt_odb_entry(const char *string, |
565 | int sep, | |
566 | struct strbuf *out) | |
567 | { | |
568 | const char *end; | |
569 | ||
570 | strbuf_reset(out); | |
571 | ||
572 | if (*string == '#') { | |
573 | /* comment; consume up to next separator */ | |
574 | end = strchrnul(string, sep); | |
575 | } else if (*string == '"' && !unquote_c_style(out, string, &end)) { | |
576 | /* | |
577 | * quoted path; unquote_c_style has copied the | |
578 | * data for us and set "end". Broken quoting (e.g., | |
579 | * an entry that doesn't end with a quote) falls | |
580 | * back to the unquoted case below. | |
581 | */ | |
582 | } else { | |
583 | /* normal, unquoted path */ | |
584 | end = strchrnul(string, sep); | |
585 | strbuf_add(out, string, end - string); | |
586 | } | |
587 | ||
588 | if (*end) | |
589 | end++; | |
590 | return end; | |
591 | } | |
592 | ||
77f012e8 SB |
593 | static void link_alt_odb_entries(struct repository *r, const char *alt, |
594 | int sep, const char *relative_base, int depth) | |
c2f493a4 | 595 | { |
539e7506 | 596 | struct strbuf objdirbuf = STRBUF_INIT; |
cf3c6352 | 597 | struct strbuf entry = STRBUF_INIT; |
c2f493a4 | 598 | |
f28e3668 JK |
599 | if (!alt || !*alt) |
600 | return; | |
601 | ||
c2f493a4 | 602 | if (depth > 5) { |
259328b7 | 603 | error(_("%s: ignoring alternate object stores, nesting too deep"), |
c2f493a4 MW |
604 | relative_base); |
605 | return; | |
606 | } | |
607 | ||
f0eaf638 | 608 | strbuf_add_absolute_path(&objdirbuf, r->objects->odb->path); |
670c359d | 609 | if (strbuf_normalize_path(&objdirbuf) < 0) |
259328b7 | 610 | die(_("unable to normalize object directory: %s"), |
670c359d | 611 | objdirbuf.buf); |
539e7506 | 612 | |
cf3c6352 JK |
613 | while (*alt) { |
614 | alt = parse_alt_odb_entry(alt, sep, &entry); | |
615 | if (!entry.len) | |
9577e7e3 | 616 | continue; |
77f012e8 | 617 | link_alt_odb_entry(r, entry.buf, |
cfc62fc9 | 618 | relative_base, depth, objdirbuf.buf); |
9577e7e3 | 619 | } |
cf3c6352 | 620 | strbuf_release(&entry); |
539e7506 | 621 | strbuf_release(&objdirbuf); |
d5a63b99 JH |
622 | } |
623 | ||
77f012e8 SB |
624 | static void read_info_alternates(struct repository *r, |
625 | const char *relative_base, | |
626 | int depth) | |
d5a63b99 | 627 | { |
5015f01c | 628 | char *path; |
dc732bd5 | 629 | struct strbuf buf = STRBUF_INIT; |
d5a63b99 | 630 | |
5015f01c | 631 | path = xstrfmt("%s/info/alternates", relative_base); |
dc732bd5 | 632 | if (strbuf_read_file(&buf, path, 1024) < 0) { |
f0f7bebe | 633 | warn_on_fopen_errors(path); |
dc732bd5 | 634 | free(path); |
9a217f2a | 635 | return; |
ace1534d | 636 | } |
d5a63b99 | 637 | |
77f012e8 | 638 | link_alt_odb_entries(r, buf.buf, '\n', relative_base, depth); |
dc732bd5 JK |
639 | strbuf_release(&buf); |
640 | free(path); | |
ace1534d JH |
641 | } |
642 | ||
bef70b22 DB |
643 | void add_to_alternates_file(const char *reference) |
644 | { | |
f132a127 | 645 | struct lock_file lock = LOCK_INIT; |
77b9b1d1 JK |
646 | char *alts = git_pathdup("objects/info/alternates"); |
647 | FILE *in, *out; | |
f132a127 | 648 | int found = 0; |
77b9b1d1 | 649 | |
f132a127 MÅ |
650 | hold_lock_file_for_update(&lock, alts, LOCK_DIE_ON_ERROR); |
651 | out = fdopen_lock_file(&lock, "w"); | |
77b9b1d1 | 652 | if (!out) |
259328b7 | 653 | die_errno(_("unable to fdopen alternates lockfile")); |
77b9b1d1 JK |
654 | |
655 | in = fopen(alts, "r"); | |
656 | if (in) { | |
657 | struct strbuf line = STRBUF_INIT; | |
77b9b1d1 | 658 | |
3f163962 | 659 | while (strbuf_getline(&line, in) != EOF) { |
77b9b1d1 JK |
660 | if (!strcmp(reference, line.buf)) { |
661 | found = 1; | |
662 | break; | |
663 | } | |
664 | fprintf_or_die(out, "%s\n", line.buf); | |
665 | } | |
666 | ||
667 | strbuf_release(&line); | |
668 | fclose(in); | |
77b9b1d1 JK |
669 | } |
670 | else if (errno != ENOENT) | |
259328b7 | 671 | die_errno(_("unable to read alternates file")); |
77b9b1d1 | 672 | |
f132a127 MÅ |
673 | if (found) { |
674 | rollback_lock_file(&lock); | |
675 | } else { | |
77b9b1d1 | 676 | fprintf_or_die(out, "%s\n", reference); |
f132a127 | 677 | if (commit_lock_file(&lock)) |
259328b7 | 678 | die_errno(_("unable to move new alternates file into place")); |
f0eaf638 | 679 | if (the_repository->objects->loaded_alternates) |
93d8d1e2 SB |
680 | link_alt_odb_entries(the_repository, reference, |
681 | '\n', NULL, 0); | |
77b9b1d1 JK |
682 | } |
683 | free(alts); | |
bef70b22 DB |
684 | } |
685 | ||
a5b34d21 JK |
686 | void add_to_alternates_memory(const char *reference) |
687 | { | |
688 | /* | |
689 | * Make sure alternates are initialized, or else our entry may be | |
690 | * overwritten when they are. | |
691 | */ | |
0b209034 | 692 | prepare_alt_odb(the_repository); |
a5b34d21 | 693 | |
93d8d1e2 SB |
694 | link_alt_odb_entries(the_repository, reference, |
695 | '\n', NULL, 0); | |
a5b34d21 JK |
696 | } |
697 | ||
9eeea7d2 SB |
698 | /* |
699 | * Compute the exact path an alternate is at and returns it. In case of | |
700 | * error NULL is returned and the human readable error is added to `err` | |
efde7b72 | 701 | * `path` may be relative and should point to $GIT_DIR. |
9eeea7d2 SB |
702 | * `err` must not be null. |
703 | */ | |
704 | char *compute_alternate_path(const char *path, struct strbuf *err) | |
705 | { | |
706 | char *ref_git = NULL; | |
4530a85b | 707 | const char *repo; |
9eeea7d2 SB |
708 | int seen_error = 0; |
709 | ||
4530a85b AM |
710 | ref_git = real_pathdup(path, 0); |
711 | if (!ref_git) { | |
9eeea7d2 SB |
712 | seen_error = 1; |
713 | strbuf_addf(err, _("path '%s' does not exist"), path); | |
714 | goto out; | |
4530a85b | 715 | } |
9eeea7d2 SB |
716 | |
717 | repo = read_gitfile(ref_git); | |
718 | if (!repo) | |
719 | repo = read_gitfile(mkpath("%s/.git", ref_git)); | |
720 | if (repo) { | |
721 | free(ref_git); | |
722 | ref_git = xstrdup(repo); | |
723 | } | |
724 | ||
725 | if (!repo && is_directory(mkpath("%s/.git/objects", ref_git))) { | |
726 | char *ref_git_git = mkpathdup("%s/.git", ref_git); | |
727 | free(ref_git); | |
728 | ref_git = ref_git_git; | |
729 | } else if (!is_directory(mkpath("%s/objects", ref_git))) { | |
730 | struct strbuf sb = STRBUF_INIT; | |
731 | seen_error = 1; | |
732 | if (get_common_dir(&sb, ref_git)) { | |
733 | strbuf_addf(err, | |
734 | _("reference repository '%s' as a linked " | |
735 | "checkout is not supported yet."), | |
736 | path); | |
737 | goto out; | |
738 | } | |
739 | ||
740 | strbuf_addf(err, _("reference repository '%s' is not a " | |
741 | "local repository."), path); | |
742 | goto out; | |
743 | } | |
744 | ||
745 | if (!access(mkpath("%s/shallow", ref_git), F_OK)) { | |
746 | strbuf_addf(err, _("reference repository '%s' is shallow"), | |
747 | path); | |
748 | seen_error = 1; | |
749 | goto out; | |
750 | } | |
751 | ||
752 | if (!access(mkpath("%s/info/grafts", ref_git), F_OK)) { | |
753 | strbuf_addf(err, | |
754 | _("reference repository '%s' is grafted"), | |
755 | path); | |
756 | seen_error = 1; | |
757 | goto out; | |
758 | } | |
759 | ||
760 | out: | |
761 | if (seen_error) { | |
6a83d902 | 762 | FREE_AND_NULL(ref_git); |
9eeea7d2 SB |
763 | } |
764 | ||
765 | return ref_git; | |
766 | } | |
767 | ||
709dfa69 JK |
768 | static void fill_alternate_refs_command(struct child_process *cmd, |
769 | const char *repo_path) | |
770 | { | |
771 | const char *value; | |
772 | ||
773 | if (!git_config_get_value("core.alternateRefsCommand", &value)) { | |
774 | cmd->use_shell = 1; | |
775 | ||
c972bf4c JK |
776 | strvec_push(&cmd->args, value); |
777 | strvec_push(&cmd->args, repo_path); | |
709dfa69 JK |
778 | } else { |
779 | cmd->git_cmd = 1; | |
780 | ||
c972bf4c JK |
781 | strvec_pushf(&cmd->args, "--git-dir=%s", repo_path); |
782 | strvec_push(&cmd->args, "for-each-ref"); | |
783 | strvec_push(&cmd->args, "--format=%(objectname)"); | |
709dfa69 JK |
784 | |
785 | if (!git_config_get_value("core.alternateRefsPrefixes", &value)) { | |
c972bf4c JK |
786 | strvec_push(&cmd->args, "--"); |
787 | strvec_split(&cmd->args, value); | |
709dfa69 JK |
788 | } |
789 | } | |
790 | ||
791 | cmd->env = local_repo_env; | |
792 | cmd->out = -1; | |
793 | } | |
794 | ||
795 | static void read_alternate_refs(const char *path, | |
796 | alternate_ref_fn *cb, | |
797 | void *data) | |
798 | { | |
799 | struct child_process cmd = CHILD_PROCESS_INIT; | |
800 | struct strbuf line = STRBUF_INIT; | |
801 | FILE *fh; | |
802 | ||
803 | fill_alternate_refs_command(&cmd, path); | |
804 | ||
805 | if (start_command(&cmd)) | |
806 | return; | |
807 | ||
808 | fh = xfdopen(cmd.out, "r"); | |
809 | while (strbuf_getline_lf(&line, fh) != EOF) { | |
810 | struct object_id oid; | |
811 | const char *p; | |
812 | ||
813 | if (parse_oid_hex(line.buf, &oid, &p) || *p) { | |
814 | warning(_("invalid line while parsing alternate refs: %s"), | |
815 | line.buf); | |
816 | break; | |
817 | } | |
818 | ||
819 | cb(&oid, data); | |
820 | } | |
821 | ||
822 | fclose(fh); | |
823 | finish_command(&cmd); | |
86ad3ea5 | 824 | strbuf_release(&line); |
709dfa69 JK |
825 | } |
826 | ||
827 | struct alternate_refs_data { | |
828 | alternate_ref_fn *fn; | |
829 | void *data; | |
830 | }; | |
831 | ||
832 | static int refs_from_alternate_cb(struct object_directory *e, | |
833 | void *data) | |
834 | { | |
835 | struct strbuf path = STRBUF_INIT; | |
836 | size_t base_len; | |
837 | struct alternate_refs_data *cb = data; | |
838 | ||
839 | if (!strbuf_realpath(&path, e->path, 0)) | |
840 | goto out; | |
841 | if (!strbuf_strip_suffix(&path, "/objects")) | |
842 | goto out; | |
843 | base_len = path.len; | |
844 | ||
845 | /* Is this a git repository with refs? */ | |
846 | strbuf_addstr(&path, "/refs"); | |
847 | if (!is_directory(path.buf)) | |
848 | goto out; | |
849 | strbuf_setlen(&path, base_len); | |
850 | ||
851 | read_alternate_refs(path.buf, cb->fn, cb->data); | |
852 | ||
853 | out: | |
854 | strbuf_release(&path); | |
855 | return 0; | |
856 | } | |
857 | ||
858 | void for_each_alternate_ref(alternate_ref_fn fn, void *data) | |
859 | { | |
860 | struct alternate_refs_data cb; | |
861 | cb.fn = fn; | |
862 | cb.data = data; | |
863 | foreach_alt_odb(refs_from_alternate_cb, &cb); | |
864 | } | |
865 | ||
fe1b2268 | 866 | int foreach_alt_odb(alt_odb_fn fn, void *cb) |
d79796bc | 867 | { |
263db403 | 868 | struct object_directory *ent; |
fe1b2268 | 869 | int r = 0; |
d79796bc | 870 | |
0b209034 | 871 | prepare_alt_odb(the_repository); |
f0eaf638 | 872 | for (ent = the_repository->objects->odb->next; ent; ent = ent->next) { |
fe1b2268 JK |
873 | r = fn(ent, cb); |
874 | if (r) | |
875 | break; | |
876 | } | |
877 | return r; | |
d79796bc JH |
878 | } |
879 | ||
13068bf0 | 880 | void prepare_alt_odb(struct repository *r) |
c2f493a4 | 881 | { |
f0eaf638 | 882 | if (r->objects->loaded_alternates) |
7dc24aa5 SP |
883 | return; |
884 | ||
13068bf0 | 885 | link_alt_odb_entries(r, r->objects->alternate_db, PATH_SEP, NULL, 0); |
c2f493a4 | 886 | |
f0eaf638 JK |
887 | read_info_alternates(r, r->objects->odb->path, 0); |
888 | r->objects->loaded_alternates = 1; | |
c2f493a4 MW |
889 | } |
890 | ||
3096b2ec | 891 | /* Returns 1 if we have successfully freshened the file, 0 otherwise. */ |
33d4221c | 892 | static int freshen_file(const char *fn) |
ace1534d | 893 | { |
312cd761 | 894 | return !utime(fn, NULL); |
0f4dc14a | 895 | } |
ace1534d | 896 | |
3096b2ec JK |
897 | /* |
898 | * All of the check_and_freshen functions return 1 if the file exists and was | |
899 | * freshened (if freshening was requested), 0 otherwise. If they return | |
900 | * 0, you should not assume that it is safe to skip a write of the object (it | |
901 | * either does not exist on disk, or has a stale mtime and may be subject to | |
902 | * pruning). | |
903 | */ | |
6a5e6f5e | 904 | int check_and_freshen_file(const char *fn, int freshen) |
33d4221c JK |
905 | { |
906 | if (access(fn, F_OK)) | |
907 | return 0; | |
3096b2ec | 908 | if (freshen && !freshen_file(fn)) |
33d4221c JK |
909 | return 0; |
910 | return 1; | |
911 | } | |
912 | ||
f0eaf638 JK |
913 | static int check_and_freshen_odb(struct object_directory *odb, |
914 | const struct object_id *oid, | |
915 | int freshen) | |
33d4221c | 916 | { |
f0eaf638 | 917 | static struct strbuf path = STRBUF_INIT; |
514c5fdd | 918 | odb_loose_path(odb, &path, oid); |
f0eaf638 JK |
919 | return check_and_freshen_file(path.buf, freshen); |
920 | } | |
ea657730 | 921 | |
f0eaf638 JK |
922 | static int check_and_freshen_local(const struct object_id *oid, int freshen) |
923 | { | |
924 | return check_and_freshen_odb(the_repository->objects->odb, oid, freshen); | |
33d4221c JK |
925 | } |
926 | ||
6862ebbf | 927 | static int check_and_freshen_nonlocal(const struct object_id *oid, int freshen) |
0f4dc14a | 928 | { |
263db403 | 929 | struct object_directory *odb; |
f3f043a1 | 930 | |
0b209034 | 931 | prepare_alt_odb(the_repository); |
f0eaf638 JK |
932 | for (odb = the_repository->objects->odb->next; odb; odb = odb->next) { |
933 | if (check_and_freshen_odb(odb, oid, freshen)) | |
c529d75a | 934 | return 1; |
ace1534d | 935 | } |
c529d75a | 936 | return 0; |
ace1534d JH |
937 | } |
938 | ||
6862ebbf | 939 | static int check_and_freshen(const struct object_id *oid, int freshen) |
33d4221c | 940 | { |
6862ebbf | 941 | return check_and_freshen_local(oid, freshen) || |
942 | check_and_freshen_nonlocal(oid, freshen); | |
33d4221c JK |
943 | } |
944 | ||
6862ebbf | 945 | int has_loose_object_nonlocal(const struct object_id *oid) |
33d4221c | 946 | { |
6862ebbf | 947 | return check_and_freshen_nonlocal(oid, 0); |
33d4221c JK |
948 | } |
949 | ||
6862ebbf | 950 | static int has_loose_object(const struct object_id *oid) |
0f4dc14a | 951 | { |
6862ebbf | 952 | return check_and_freshen(oid, 0); |
0f4dc14a BC |
953 | } |
954 | ||
02710228 SP |
955 | static void mmap_limit_check(size_t length) |
956 | { | |
957 | static size_t limit = 0; | |
958 | if (!limit) { | |
959 | limit = git_env_ulong("GIT_MMAP_LIMIT", 0); | |
960 | if (!limit) | |
961 | limit = SIZE_MAX; | |
962 | } | |
963 | if (length > limit) | |
259328b7 | 964 | die(_("attempting to mmap %"PRIuMAX" over limit %"PRIuMAX), |
02710228 SP |
965 | (uintmax_t)length, (uintmax_t)limit); |
966 | } | |
967 | ||
1570856b JK |
968 | void *xmmap_gently(void *start, size_t length, |
969 | int prot, int flags, int fd, off_t offset) | |
58ecbd5e | 970 | { |
02710228 SP |
971 | void *ret; |
972 | ||
973 | mmap_limit_check(length); | |
974 | ret = mmap(start, length, prot, flags, fd, offset); | |
9827d4c1 JK |
975 | if (ret == MAP_FAILED && !length) |
976 | ret = NULL; | |
58ecbd5e JN |
977 | return ret; |
978 | } | |
979 | ||
1570856b JK |
980 | void *xmmap(void *start, size_t length, |
981 | int prot, int flags, int fd, off_t offset) | |
982 | { | |
983 | void *ret = xmmap_gently(start, length, prot, flags, fd, offset); | |
984 | if (ret == MAP_FAILED) | |
259328b7 | 985 | die_errno(_("mmap failed")); |
1570856b JK |
986 | return ret; |
987 | } | |
988 | ||
88d0db55 | 989 | /* |
090ea126 | 990 | * With an in-core object data in "map", rehash it to make sure the |
cb1c8d1d JK |
991 | * object name actually matches "oid" to detect object corruption. |
992 | * With "map" == NULL, try reading the object named with "oid" using | |
090ea126 | 993 | * the streaming interface and rehash it to do the same. |
88d0db55 | 994 | */ |
b98d1885 MT |
995 | int check_object_signature(struct repository *r, const struct object_id *oid, |
996 | void *map, unsigned long size, const char *type) | |
88d0db55 | 997 | { |
f070facc | 998 | struct object_id real_oid; |
090ea126 NTND |
999 | enum object_type obj_type; |
1000 | struct git_istream *st; | |
18e2588e | 1001 | git_hash_ctx c; |
1af64f73 | 1002 | char hdr[MAX_HEADER_LEN]; |
090ea126 | 1003 | int hdrlen; |
88d0db55 | 1004 | |
090ea126 | 1005 | if (map) { |
b98d1885 | 1006 | hash_object_file(r->hash_algo, map, size, type, &real_oid); |
9001dc2a | 1007 | return !oideq(oid, &real_oid) ? -1 : 0; |
88d0db55 BC |
1008 | } |
1009 | ||
b98d1885 | 1010 | st = open_istream(r, oid, &obj_type, &size, NULL); |
090ea126 NTND |
1011 | if (!st) |
1012 | return -1; | |
88d0db55 | 1013 | |
090ea126 | 1014 | /* Generate the header */ |
ca473cef | 1015 | hdrlen = xsnprintf(hdr, sizeof(hdr), "%s %"PRIuMAX , type_name(obj_type), (uintmax_t)size) + 1; |
88d0db55 | 1016 | |
090ea126 | 1017 | /* Sha1.. */ |
b98d1885 MT |
1018 | r->hash_algo->init_fn(&c); |
1019 | r->hash_algo->update_fn(&c, hdr, hdrlen); | |
090ea126 NTND |
1020 | for (;;) { |
1021 | char buf[1024 * 16]; | |
1022 | ssize_t readlen = read_istream(st, buf, sizeof(buf)); | |
1f688557 | 1023 | |
f54fac53 JK |
1024 | if (readlen < 0) { |
1025 | close_istream(st); | |
1026 | return -1; | |
1027 | } | |
090ea126 NTND |
1028 | if (!readlen) |
1029 | break; | |
b98d1885 | 1030 | r->hash_algo->update_fn(&c, buf, readlen); |
fa5fc15d | 1031 | } |
b98d1885 | 1032 | r->hash_algo->final_fn(real_oid.hash, &c); |
090ea126 | 1033 | close_istream(st); |
9001dc2a | 1034 | return !oideq(oid, &real_oid) ? -1 : 0; |
fa5fc15d SP |
1035 | } |
1036 | ||
1b8ac5ea | 1037 | int git_open_cloexec(const char *name, int flags) |
a0788266 | 1038 | { |
1e3001a8 JH |
1039 | int fd; |
1040 | static int o_cloexec = O_CLOEXEC; | |
a0788266 | 1041 | |
1e3001a8 JH |
1042 | fd = open(name, flags | o_cloexec); |
1043 | if ((o_cloexec & O_CLOEXEC) && fd < 0 && errno == EINVAL) { | |
cd66ada0 | 1044 | /* Try again w/o O_CLOEXEC: the kernel might not support it */ |
1e3001a8 JH |
1045 | o_cloexec &= ~O_CLOEXEC; |
1046 | fd = open(name, flags | o_cloexec); | |
491a8dec | 1047 | } |
491a8dec | 1048 | |
9fb9495d | 1049 | #if defined(F_GETFD) && defined(F_SETFD) && defined(FD_CLOEXEC) |
491a8dec | 1050 | { |
1e3001a8 | 1051 | static int fd_cloexec = FD_CLOEXEC; |
a0788266 | 1052 | |
1e3001a8 JH |
1053 | if (!o_cloexec && 0 <= fd && fd_cloexec) { |
1054 | /* Opened w/o O_CLOEXEC? try with fcntl(2) to add it */ | |
9fb9495d EW |
1055 | int flags = fcntl(fd, F_GETFD); |
1056 | if (fcntl(fd, F_SETFD, flags | fd_cloexec)) | |
1e3001a8 | 1057 | fd_cloexec = 0; |
cd66ada0 | 1058 | } |
44d1c19e | 1059 | } |
a0788266 | 1060 | #endif |
1b8ac5ea | 1061 | return fd; |
a0788266 JS |
1062 | } |
1063 | ||
3cf8b462 | 1064 | /* |
514c5fdd | 1065 | * Find "oid" as a loose object in the local repository or in an alternate. |
771e7d57 JK |
1066 | * Returns 0 on success, negative on failure. |
1067 | * | |
1068 | * The "path" out-parameter will give the path of the object we found (if any). | |
1069 | * Note that it may point to static storage and is only valid until another | |
514c5fdd | 1070 | * call to stat_loose_object(). |
3cf8b462 | 1071 | */ |
514c5fdd JK |
1072 | static int stat_loose_object(struct repository *r, const struct object_id *oid, |
1073 | struct stat *st, const char **path) | |
1f688557 | 1074 | { |
263db403 | 1075 | struct object_directory *odb; |
ea657730 CC |
1076 | static struct strbuf buf = STRBUF_INIT; |
1077 | ||
d2607fa0 | 1078 | prepare_alt_odb(r); |
f0eaf638 | 1079 | for (odb = r->objects->odb; odb; odb = odb->next) { |
514c5fdd | 1080 | *path = odb_loose_path(odb, &buf, oid); |
771e7d57 | 1081 | if (!lstat(*path, st)) |
052fe5ea | 1082 | return 0; |
c7934306 SP |
1083 | } |
1084 | ||
3cf8b462 SP |
1085 | return -1; |
1086 | } | |
1087 | ||
771e7d57 | 1088 | /* |
514c5fdd | 1089 | * Like stat_loose_object(), but actually open the object and return the |
771e7d57 JK |
1090 | * descriptor. See the caveats on the "path" parameter above. |
1091 | */ | |
514c5fdd JK |
1092 | static int open_loose_object(struct repository *r, |
1093 | const struct object_id *oid, const char **path) | |
60bb8b14 | 1094 | { |
44d1c19e | 1095 | int fd; |
263db403 | 1096 | struct object_directory *odb; |
f0eaf638 | 1097 | int most_interesting_errno = ENOENT; |
ea657730 CC |
1098 | static struct strbuf buf = STRBUF_INIT; |
1099 | ||
ec7283e5 | 1100 | prepare_alt_odb(r); |
f0eaf638 | 1101 | for (odb = r->objects->odb; odb; odb = odb->next) { |
514c5fdd | 1102 | *path = odb_loose_path(odb, &buf, oid); |
771e7d57 | 1103 | fd = git_open(*path); |
44d1c19e LT |
1104 | if (fd >= 0) |
1105 | return fd; | |
f0eaf638 | 1106 | |
d6c8a05b JK |
1107 | if (most_interesting_errno == ENOENT) |
1108 | most_interesting_errno = errno; | |
03e79c88 | 1109 | } |
d6c8a05b | 1110 | errno = most_interesting_errno; |
44d1c19e | 1111 | return -1; |
1f688557 JH |
1112 | } |
1113 | ||
61c7711c | 1114 | static int quick_has_loose(struct repository *r, |
d7a24573 | 1115 | const struct object_id *oid) |
61c7711c | 1116 | { |
61c7711c JK |
1117 | struct object_directory *odb; |
1118 | ||
61c7711c JK |
1119 | prepare_alt_odb(r); |
1120 | for (odb = r->objects->odb; odb; odb = odb->next) { | |
d7a24573 | 1121 | if (oid_array_lookup(odb_loose_cache(odb, oid), oid) >= 0) |
61c7711c JK |
1122 | return 1; |
1123 | } | |
1124 | return 0; | |
1125 | } | |
1126 | ||
f6371f92 JK |
1127 | /* |
1128 | * Map the loose object at "path" if it is not NULL, or the path found by | |
514c5fdd | 1129 | * searching for a loose object named "oid". |
f6371f92 | 1130 | */ |
514c5fdd JK |
1131 | static void *map_loose_object_1(struct repository *r, const char *path, |
1132 | const struct object_id *oid, unsigned long *size) | |
27d69a46 | 1133 | { |
0fcfd160 | 1134 | void *map; |
144bde78 | 1135 | int fd; |
84dd81c1 | 1136 | |
f6371f92 JK |
1137 | if (path) |
1138 | fd = git_open(path); | |
8261e1f1 | 1139 | else |
514c5fdd | 1140 | fd = open_loose_object(r, oid, &path); |
44d1c19e LT |
1141 | map = NULL; |
1142 | if (fd >= 0) { | |
1143 | struct stat st; | |
1f688557 | 1144 | |
44d1c19e LT |
1145 | if (!fstat(fd, &st)) { |
1146 | *size = xsize_t(st.st_size); | |
33e42de0 MM |
1147 | if (!*size) { |
1148 | /* mmap() is forbidden on empty files */ | |
259328b7 | 1149 | error(_("object file %s is empty"), path); |
6881925e | 1150 | close(fd); |
33e42de0 MM |
1151 | return NULL; |
1152 | } | |
44d1c19e | 1153 | map = xmmap(NULL, *size, PROT_READ, MAP_PRIVATE, fd, 0); |
144bde78 | 1154 | } |
44d1c19e | 1155 | close(fd); |
74e34e1f | 1156 | } |
0fcfd160 | 1157 | return map; |
74e34e1f NP |
1158 | } |
1159 | ||
514c5fdd JK |
1160 | void *map_loose_object(struct repository *r, |
1161 | const struct object_id *oid, | |
1162 | unsigned long *size) | |
068f85e3 | 1163 | { |
514c5fdd | 1164 | return map_loose_object_1(r, NULL, oid, size); |
068f85e3 | 1165 | } |
1166 | ||
00a7760e JK |
1167 | static int unpack_loose_short_header(git_zstream *stream, |
1168 | unsigned char *map, unsigned long mapsize, | |
1169 | void *buffer, unsigned long bufsiz) | |
47fe3f6e | 1170 | { |
31877c9a MT |
1171 | int ret; |
1172 | ||
c4483576 LT |
1173 | /* Get the data stream */ |
1174 | memset(stream, 0, sizeof(*stream)); | |
1175 | stream->next_in = map; | |
1176 | stream->avail_in = mapsize; | |
1177 | stream->next_out = buffer; | |
93821bd9 | 1178 | stream->avail_out = bufsiz; |
47fe3f6e | 1179 | |
39c68542 | 1180 | git_inflate_init(stream); |
31877c9a MT |
1181 | obj_read_unlock(); |
1182 | ret = git_inflate(stream, 0); | |
1183 | obj_read_lock(); | |
1184 | ||
1185 | return ret; | |
9a217f2a JH |
1186 | } |
1187 | ||
00a7760e JK |
1188 | int unpack_loose_header(git_zstream *stream, |
1189 | unsigned char *map, unsigned long mapsize, | |
1190 | void *buffer, unsigned long bufsiz) | |
1f688557 | 1191 | { |
00a7760e JK |
1192 | int status = unpack_loose_short_header(stream, map, mapsize, |
1193 | buffer, bufsiz); | |
42873078 | 1194 | |
d21f8426 JH |
1195 | if (status < Z_OK) |
1196 | return status; | |
628522ec | 1197 | |
d21f8426 JH |
1198 | /* Make sure we have the terminating NUL */ |
1199 | if (!memchr(buffer, '\0', stream->next_out - (unsigned char *)buffer)) | |
1200 | return -1; | |
1f688557 JH |
1201 | return 0; |
1202 | } | |
1203 | ||
00a7760e JK |
1204 | static int unpack_loose_header_to_strbuf(git_zstream *stream, unsigned char *map, |
1205 | unsigned long mapsize, void *buffer, | |
1206 | unsigned long bufsiz, struct strbuf *header) | |
d131b7af | 1207 | { |
46f03448 KN |
1208 | int status; |
1209 | ||
00a7760e | 1210 | status = unpack_loose_short_header(stream, map, mapsize, buffer, bufsiz); |
d21f8426 JH |
1211 | if (status < Z_OK) |
1212 | return -1; | |
d131b7af | 1213 | |
46f03448 KN |
1214 | /* |
1215 | * Check if entire header is unpacked in the first iteration. | |
d131b7af | 1216 | */ |
46f03448 KN |
1217 | if (memchr(buffer, '\0', stream->next_out - (unsigned char *)buffer)) |
1218 | return 0; | |
d131b7af | 1219 | |
46f03448 KN |
1220 | /* |
1221 | * buffer[0..bufsiz] was not large enough. Copy the partial | |
1222 | * result out to header, and then append the result of further | |
1223 | * reading the stream. | |
1224 | */ | |
1225 | strbuf_add(header, buffer, stream->next_out - (unsigned char *)buffer); | |
1226 | stream->next_out = buffer; | |
1227 | stream->avail_out = bufsiz; | |
d131b7af | 1228 | |
46f03448 | 1229 | do { |
31877c9a | 1230 | obj_read_unlock(); |
46f03448 | 1231 | status = git_inflate(stream, 0); |
31877c9a | 1232 | obj_read_lock(); |
46f03448 KN |
1233 | strbuf_add(header, buffer, stream->next_out - (unsigned char *)buffer); |
1234 | if (memchr(buffer, '\0', stream->next_out - (unsigned char *)buffer)) | |
1235 | return 0; | |
1236 | stream->next_out = buffer; | |
1237 | stream->avail_out = bufsiz; | |
1238 | } while (status != Z_STREAM_END); | |
1239 | return -1; | |
d131b7af SP |
1240 | } |
1241 | ||
00a7760e JK |
1242 | static void *unpack_loose_rest(git_zstream *stream, |
1243 | void *buffer, unsigned long size, | |
1244 | const struct object_id *oid) | |
95099731 | 1245 | { |
5180cacc | 1246 | int bytes = strlen(buffer) + 1; |
3aee68aa | 1247 | unsigned char *buf = xmallocz(size); |
93821bd9 | 1248 | unsigned long n; |
7efbff75 | 1249 | int status = Z_OK; |
95099731 | 1250 | |
93821bd9 LT |
1251 | n = stream->total_out - bytes; |
1252 | if (n > size) | |
1253 | n = size; | |
1254 | memcpy(buf, (char *) buffer + bytes, n); | |
1255 | bytes = n; | |
456cdf6e LT |
1256 | if (bytes <= size) { |
1257 | /* | |
1258 | * The above condition must be (bytes <= size), not | |
1259 | * (bytes < size). In other words, even though we | |
ccf5ace0 | 1260 | * expect no more output and set avail_out to zero, |
456cdf6e LT |
1261 | * the input zlib stream may have bytes that express |
1262 | * "this concludes the stream", and we *do* want to | |
1263 | * eat that input. | |
1264 | * | |
1265 | * Otherwise we would not be able to test that we | |
1266 | * consumed all the input to reach the expected size; | |
1267 | * we also want to check that zlib tells us that all | |
1268 | * went well with status == Z_STREAM_END at the end. | |
1269 | */ | |
5180cacc LT |
1270 | stream->next_out = buf + bytes; |
1271 | stream->avail_out = size - bytes; | |
31877c9a MT |
1272 | while (status == Z_OK) { |
1273 | obj_read_unlock(); | |
39c68542 | 1274 | status = git_inflate(stream, Z_FINISH); |
31877c9a MT |
1275 | obj_read_lock(); |
1276 | } | |
5180cacc | 1277 | } |
456cdf6e | 1278 | if (status == Z_STREAM_END && !stream->avail_in) { |
39c68542 | 1279 | git_inflate_end(stream); |
7efbff75 | 1280 | return buf; |
95099731 NTND |
1281 | } |
1282 | ||
7efbff75 | 1283 | if (status < 0) |
00a7760e | 1284 | error(_("corrupt loose object '%s'"), oid_to_hex(oid)); |
7efbff75 | 1285 | else if (stream->avail_in) |
259328b7 | 1286 | error(_("garbage at end of loose object '%s'"), |
00a7760e | 1287 | oid_to_hex(oid)); |
7efbff75 JH |
1288 | free(buf); |
1289 | return NULL; | |
95099731 NTND |
1290 | } |
1291 | ||
d40d535b | 1292 | /* |
5180cacc LT |
1293 | * We used to just use "sscanf()", but that's actually way |
1294 | * too permissive for what we want to check. So do an anal | |
1295 | * object header parse by hand. | |
d40d535b | 1296 | */ |
00a7760e JK |
1297 | static int parse_loose_header_extended(const char *hdr, struct object_info *oi, |
1298 | unsigned int flags) | |
1f688557 | 1299 | { |
46f03448 | 1300 | const char *type_buf = hdr; |
5180cacc | 1301 | unsigned long size; |
46f03448 | 1302 | int type, type_len = 0; |
43057304 | 1303 | |
5180cacc | 1304 | /* |
46f03448 | 1305 | * The type can be of any size but is followed by |
21666f1a | 1306 | * a space. |
5180cacc | 1307 | */ |
5180cacc LT |
1308 | for (;;) { |
1309 | char c = *hdr++; | |
d21f8426 JH |
1310 | if (!c) |
1311 | return -1; | |
5180cacc LT |
1312 | if (c == ' ') |
1313 | break; | |
46f03448 | 1314 | type_len++; |
5180cacc | 1315 | } |
1f688557 | 1316 | |
46f03448 | 1317 | type = type_from_string_gently(type_buf, type_len, 1); |
6ca32f47 BW |
1318 | if (oi->type_name) |
1319 | strbuf_add(oi->type_name, type_buf, type_len); | |
46f03448 KN |
1320 | /* |
1321 | * Set type to 0 if its an unknown object and | |
2e3a16b2 | 1322 | * we're obtaining the type using '--allow-unknown-type' |
46f03448 KN |
1323 | * option. |
1324 | */ | |
19fc5e84 | 1325 | if ((flags & OBJECT_INFO_ALLOW_UNKNOWN_TYPE) && (type < 0)) |
46f03448 KN |
1326 | type = 0; |
1327 | else if (type < 0) | |
259328b7 | 1328 | die(_("invalid object type")); |
46f03448 KN |
1329 | if (oi->typep) |
1330 | *oi->typep = type; | |
5180cacc LT |
1331 | |
1332 | /* | |
1333 | * The length must follow immediately, and be in canonical | |
1334 | * decimal format (ie "010" is not valid). | |
1335 | */ | |
1336 | size = *hdr++ - '0'; | |
1337 | if (size > 9) | |
1338 | return -1; | |
1339 | if (size) { | |
1340 | for (;;) { | |
1341 | unsigned long c = *hdr - '0'; | |
1342 | if (c > 9) | |
1343 | break; | |
1344 | hdr++; | |
1345 | size = size * 10 + c; | |
1b1005d1 | 1346 | } |
c01f51cc | 1347 | } |
46f03448 KN |
1348 | |
1349 | if (oi->sizep) | |
1350 | *oi->sizep = size; | |
5180cacc LT |
1351 | |
1352 | /* | |
1353 | * The length must be followed by a zero byte | |
1354 | */ | |
46f03448 | 1355 | return *hdr ? -1 : type; |
1f688557 JH |
1356 | } |
1357 | ||
00a7760e | 1358 | int parse_loose_header(const char *hdr, unsigned long *sizep) |
bf592c50 | 1359 | { |
27b5c1a0 | 1360 | struct object_info oi = OBJECT_INFO_INIT; |
21666f1a | 1361 | |
46f03448 | 1362 | oi.sizep = sizep; |
00a7760e | 1363 | return parse_loose_header_extended(hdr, &oi, 0); |
bf592c50 DB |
1364 | } |
1365 | ||
514c5fdd JK |
1366 | static int loose_object_info(struct repository *r, |
1367 | const struct object_id *oid, | |
1368 | struct object_info *oi, int flags) | |
65c2e0c3 | 1369 | { |
46f03448 KN |
1370 | int status = 0; |
1371 | unsigned long mapsize; | |
65c2e0c3 | 1372 | void *map; |
ef49a7a0 | 1373 | git_zstream stream; |
1af64f73 | 1374 | char hdr[MAX_HEADER_LEN]; |
46f03448 | 1375 | struct strbuf hdrbuf = STRBUF_INIT; |
c84a1f3e | 1376 | unsigned long size_scratch; |
65c2e0c3 | 1377 | |
b99b6bcc JK |
1378 | if (oi->delta_base_oid) |
1379 | oidclr(oi->delta_base_oid); | |
5d642e75 | 1380 | |
052fe5ea JK |
1381 | /* |
1382 | * If we don't care about type or size, then we don't | |
4ef8d1dd JH |
1383 | * need to look inside the object at all. Note that we |
1384 | * do not optimize out the stat call, even if the | |
1385 | * caller doesn't care about the disk-size, since our | |
1386 | * return value implicitly indicates whether the | |
1387 | * object even exists. | |
052fe5ea | 1388 | */ |
6ca32f47 | 1389 | if (!oi->typep && !oi->type_name && !oi->sizep && !oi->contentp) { |
771e7d57 | 1390 | const char *path; |
4ef8d1dd | 1391 | struct stat st; |
61c7711c | 1392 | if (!oi->disk_sizep && (flags & OBJECT_INFO_QUICK)) |
d7a24573 | 1393 | return quick_has_loose(r, oid) ? 0 : -1; |
514c5fdd | 1394 | if (stat_loose_object(r, oid, &st, &path) < 0) |
4ef8d1dd JH |
1395 | return -1; |
1396 | if (oi->disk_sizep) | |
23c339c0 | 1397 | *oi->disk_sizep = st.st_size; |
052fe5ea JK |
1398 | return 0; |
1399 | } | |
1400 | ||
514c5fdd | 1401 | map = map_loose_object(r, oid, &mapsize); |
f0df4ed5 | 1402 | if (!map) |
dbea72a8 | 1403 | return -1; |
c84a1f3e JT |
1404 | |
1405 | if (!oi->sizep) | |
1406 | oi->sizep = &size_scratch; | |
1407 | ||
23c339c0 JK |
1408 | if (oi->disk_sizep) |
1409 | *oi->disk_sizep = mapsize; | |
19fc5e84 | 1410 | if ((flags & OBJECT_INFO_ALLOW_UNKNOWN_TYPE)) { |
00a7760e | 1411 | if (unpack_loose_header_to_strbuf(&stream, map, mapsize, hdr, sizeof(hdr), &hdrbuf) < 0) |
259328b7 | 1412 | status = error(_("unable to unpack %s header with --allow-unknown-type"), |
514c5fdd | 1413 | oid_to_hex(oid)); |
00a7760e | 1414 | } else if (unpack_loose_header(&stream, map, mapsize, hdr, sizeof(hdr)) < 0) |
259328b7 | 1415 | status = error(_("unable to unpack %s header"), |
514c5fdd | 1416 | oid_to_hex(oid)); |
46f03448 KN |
1417 | if (status < 0) |
1418 | ; /* Do nothing */ | |
1419 | else if (hdrbuf.len) { | |
00a7760e | 1420 | if ((status = parse_loose_header_extended(hdrbuf.buf, oi, flags)) < 0) |
259328b7 | 1421 | status = error(_("unable to parse %s header with --allow-unknown-type"), |
514c5fdd | 1422 | oid_to_hex(oid)); |
00a7760e | 1423 | } else if ((status = parse_loose_header_extended(hdr, oi, flags)) < 0) |
514c5fdd | 1424 | status = error(_("unable to parse %s header"), oid_to_hex(oid)); |
c84a1f3e | 1425 | |
b3ea7dd3 | 1426 | if (status >= 0 && oi->contentp) { |
00a7760e JK |
1427 | *oi->contentp = unpack_loose_rest(&stream, hdr, |
1428 | *oi->sizep, oid); | |
b3ea7dd3 JK |
1429 | if (!*oi->contentp) { |
1430 | git_inflate_end(&stream); | |
1431 | status = -1; | |
1432 | } | |
1433 | } else | |
c84a1f3e JT |
1434 | git_inflate_end(&stream); |
1435 | ||
65c2e0c3 | 1436 | munmap(map, mapsize); |
46f03448 | 1437 | if (status && oi->typep) |
23c339c0 | 1438 | *oi->typep = status; |
c84a1f3e JT |
1439 | if (oi->sizep == &size_scratch) |
1440 | oi->sizep = NULL; | |
46f03448 | 1441 | strbuf_release(&hdrbuf); |
3ab0fb06 | 1442 | oi->whence = OI_LOOSE; |
93cff9a9 | 1443 | return (status < 0) ? status : 0; |
65c2e0c3 JH |
1444 | } |
1445 | ||
31877c9a MT |
1446 | int obj_read_use_lock = 0; |
1447 | pthread_mutex_t obj_read_mutex; | |
1448 | ||
1449 | void enable_obj_read_lock(void) | |
1450 | { | |
1451 | if (obj_read_use_lock) | |
1452 | return; | |
1453 | ||
1454 | obj_read_use_lock = 1; | |
1455 | init_recursive_mutex(&obj_read_mutex); | |
1456 | } | |
1457 | ||
1458 | void disable_obj_read_lock(void) | |
1459 | { | |
1460 | if (!obj_read_use_lock) | |
1461 | return; | |
1462 | ||
1463 | obj_read_use_lock = 0; | |
1464 | pthread_mutex_destroy(&obj_read_mutex); | |
1465 | } | |
1466 | ||
8b4c0103 JT |
1467 | int fetch_if_missing = 1; |
1468 | ||
31877c9a MT |
1469 | static int do_oid_object_info_extended(struct repository *r, |
1470 | const struct object_id *oid, | |
1471 | struct object_info *oi, unsigned flags) | |
f0df4ed5 | 1472 | { |
cd585e2a | 1473 | static struct object_info blank_oi = OBJECT_INFO_INIT; |
9c8a294a | 1474 | struct cached_object *co; |
f0df4ed5 | 1475 | struct pack_entry e; |
5b086407 | 1476 | int rtype; |
b383a13c | 1477 | const struct object_id *real = oid; |
8b4c0103 | 1478 | int already_retried = 0; |
f0df4ed5 | 1479 | |
31877c9a | 1480 | |
b383a13c | 1481 | if (flags & OBJECT_INFO_LOOKUP_REPLACE) |
9d98354f | 1482 | real = lookup_replace_object(r, oid); |
f0df4ed5 | 1483 | |
b383a13c | 1484 | if (is_null_oid(real)) |
87b5e236 JK |
1485 | return -1; |
1486 | ||
cd585e2a JT |
1487 | if (!oi) |
1488 | oi = &blank_oi; | |
1489 | ||
9c8a294a JT |
1490 | co = find_cached_object(real); |
1491 | if (co) { | |
1492 | if (oi->typep) | |
1493 | *(oi->typep) = co->type; | |
1494 | if (oi->sizep) | |
1495 | *(oi->sizep) = co->size; | |
1496 | if (oi->disk_sizep) | |
1497 | *(oi->disk_sizep) = 0; | |
b99b6bcc JK |
1498 | if (oi->delta_base_oid) |
1499 | oidclr(oi->delta_base_oid); | |
9c8a294a JT |
1500 | if (oi->type_name) |
1501 | strbuf_addstr(oi->type_name, type_name(co->type)); | |
1502 | if (oi->contentp) | |
1503 | *oi->contentp = xmemdupz(co->buf, co->size); | |
1504 | oi->whence = OI_CACHED; | |
1505 | return 0; | |
c4d9986f NTND |
1506 | } |
1507 | ||
8b4c0103 | 1508 | while (1) { |
42c8ce1c | 1509 | if (find_pack_entry(r, real, &e)) |
8b4c0103 JT |
1510 | break; |
1511 | ||
024aa469 TI |
1512 | if (flags & OBJECT_INFO_IGNORE_LOOSE) |
1513 | return -1; | |
1514 | ||
ddd63e64 | 1515 | /* Most likely it's a loose object. */ |
514c5fdd | 1516 | if (!loose_object_info(r, real, oi, flags)) |
5b086407 | 1517 | return 0; |
ddd63e64 SG |
1518 | |
1519 | /* Not a loose object; someone else may have just packed it. */ | |
2b7750c9 | 1520 | if (!(flags & OBJECT_INFO_QUICK)) { |
9d98354f | 1521 | reprepare_packed_git(r); |
42c8ce1c | 1522 | if (find_pack_entry(r, real, &e)) |
2b7750c9 JT |
1523 | break; |
1524 | } | |
8b4c0103 JT |
1525 | |
1526 | /* Check if it is a missing object */ | |
b14ed5ad | 1527 | if (fetch_if_missing && has_promisor_remote() && |
0f4a4fb1 | 1528 | !already_retried && r == the_repository && |
31f5256c | 1529 | !(flags & OBJECT_INFO_SKIP_FETCH_OBJECT)) { |
8b4c0103 | 1530 | /* |
b14ed5ad CC |
1531 | * TODO Investigate checking promisor_remote_get_direct() |
1532 | * TODO return value and stopping on error here. | |
1533 | * TODO Pass a repository struct through | |
1534 | * promisor_remote_get_direct(), such that arbitrary | |
1535 | * repositories work. | |
8b4c0103 | 1536 | */ |
b14ed5ad | 1537 | promisor_remote_get_direct(r, real, 1); |
8b4c0103 JT |
1538 | already_retried = 1; |
1539 | continue; | |
dfdd4afc | 1540 | } |
8b4c0103 JT |
1541 | |
1542 | return -1; | |
f0df4ed5 | 1543 | } |
3d77d877 | 1544 | |
cd585e2a JT |
1545 | if (oi == &blank_oi) |
1546 | /* | |
1547 | * We know that the caller doesn't actually need the | |
1548 | * information below, so return early. | |
1549 | */ | |
1550 | return 0; | |
9d98354f | 1551 | rtype = packed_object_info(r, e.p, e.offset, oi); |
412916ee | 1552 | if (rtype < 0) { |
b383a13c | 1553 | mark_bad_packed_object(e.p, real->hash); |
31877c9a | 1554 | return do_oid_object_info_extended(r, real, oi, 0); |
3ab0fb06 | 1555 | } else if (oi->whence == OI_PACKED) { |
9a490590 JH |
1556 | oi->u.packed.offset = e.offset; |
1557 | oi->u.packed.pack = e.p; | |
1558 | oi->u.packed.is_delta = (rtype == OBJ_REF_DELTA || | |
1559 | rtype == OBJ_OFS_DELTA); | |
3d77d877 NP |
1560 | } |
1561 | ||
5b086407 | 1562 | return 0; |
f0df4ed5 JS |
1563 | } |
1564 | ||
31877c9a MT |
1565 | int oid_object_info_extended(struct repository *r, const struct object_id *oid, |
1566 | struct object_info *oi, unsigned flags) | |
1567 | { | |
1568 | int ret; | |
1569 | obj_read_lock(); | |
1570 | ret = do_oid_object_info_extended(r, oid, oi, flags); | |
1571 | obj_read_unlock(); | |
1572 | return ret; | |
1573 | } | |
1574 | ||
1575 | ||
3fc0dca9 | 1576 | /* returns enum object_type or negative */ |
9d98354f SB |
1577 | int oid_object_info(struct repository *r, |
1578 | const struct object_id *oid, | |
1579 | unsigned long *sizep) | |
9a490590 | 1580 | { |
5b086407 | 1581 | enum object_type type; |
27b5c1a0 | 1582 | struct object_info oi = OBJECT_INFO_INIT; |
9a490590 | 1583 | |
5b086407 | 1584 | oi.typep = &type; |
9a490590 | 1585 | oi.sizep = sizep; |
9d98354f SB |
1586 | if (oid_object_info_extended(r, oid, &oi, |
1587 | OBJECT_INFO_LOOKUP_REPLACE) < 0) | |
5b086407 JK |
1588 | return -1; |
1589 | return type; | |
9a490590 JH |
1590 | } |
1591 | ||
1b9b5c69 | 1592 | static void *read_object(struct repository *r, |
cba595ab | 1593 | const struct object_id *oid, enum object_type *type, |
f1d8130b JT |
1594 | unsigned long *size) |
1595 | { | |
1596 | struct object_info oi = OBJECT_INFO_INIT; | |
1597 | void *content; | |
1598 | oi.typep = type; | |
1599 | oi.sizep = size; | |
1600 | oi.contentp = &content; | |
1601 | ||
cba595ab | 1602 | if (oid_object_info_extended(r, oid, &oi, 0) < 0) |
f1d8130b JT |
1603 | return NULL; |
1604 | return content; | |
1605 | } | |
1606 | ||
829e5c3b PO |
1607 | int pretend_object_file(void *buf, unsigned long len, enum object_type type, |
1608 | struct object_id *oid) | |
d66b37bb JH |
1609 | { |
1610 | struct cached_object *co; | |
1611 | ||
2dcde20e | 1612 | hash_object_file(the_hash_algo, buf, len, type_name(type), oid); |
a64d2aae JT |
1613 | if (has_object_file_with_flags(oid, OBJECT_INFO_QUICK | OBJECT_INFO_SKIP_FETCH_OBJECT) || |
1614 | find_cached_object(oid)) | |
d66b37bb | 1615 | return 0; |
c7353967 | 1616 | ALLOC_GROW(cached_objects, cached_object_nr + 1, cached_object_alloc); |
d66b37bb JH |
1617 | co = &cached_objects[cached_object_nr++]; |
1618 | co->size = len; | |
21666f1a | 1619 | co->type = type; |
efa13f7b JH |
1620 | co->buf = xmalloc(len); |
1621 | memcpy(co->buf, buf, len); | |
62ba93ea | 1622 | oidcpy(&co->oid, oid); |
d66b37bb JH |
1623 | return 0; |
1624 | } | |
1625 | ||
b6c4cecc JH |
1626 | /* |
1627 | * This function dies on corrupt objects; the callers who want to | |
1628 | * deal with them should arrange to call read_object() and give error | |
1629 | * messages themselves. | |
1630 | */ | |
a3b72c89 SB |
1631 | void *read_object_file_extended(struct repository *r, |
1632 | const struct object_id *oid, | |
b4f5aca4 | 1633 | enum object_type *type, |
1634 | unsigned long *size, | |
1635 | int lookup_replace) | |
ac939109 | 1636 | { |
3ba7a065 | 1637 | void *data; |
b6c4cecc | 1638 | const struct packed_git *p; |
771e7d57 JK |
1639 | const char *path; |
1640 | struct stat st; | |
1f2e7cea | 1641 | const struct object_id *repl = lookup_replace ? |
a3b72c89 | 1642 | lookup_replace_object(r, oid) : oid; |
b6c4cecc | 1643 | |
3ba7a065 | 1644 | errno = 0; |
cba595ab | 1645 | data = read_object(r, repl, type, size); |
4bbf5a26 | 1646 | if (data) |
b6c4cecc | 1647 | return data; |
68095570 | 1648 | |
31877c9a | 1649 | obj_read_lock(); |
25f3af3f | 1650 | if (errno && errno != ENOENT) |
259328b7 | 1651 | die_errno(_("failed to read object %s"), oid_to_hex(oid)); |
3ba7a065 | 1652 | |
68095570 | 1653 | /* die if we replaced an object with one that does not exist */ |
b383a13c | 1654 | if (repl != oid) |
259328b7 | 1655 | die(_("replacement %s not found for %s"), |
b383a13c | 1656 | oid_to_hex(repl), oid_to_hex(oid)); |
68095570 | 1657 | |
cba595ab | 1658 | if (!stat_loose_object(r, repl, &st, &path)) |
259328b7 | 1659 | die(_("loose object %s (stored in %s) is corrupt"), |
b383a13c | 1660 | oid_to_hex(repl), path); |
68095570 | 1661 | |
a3b72c89 | 1662 | if ((p = has_packed_and_bad(r, repl->hash)) != NULL) |
259328b7 | 1663 | die(_("packed object %s (stored in %s) is corrupt"), |
b383a13c | 1664 | oid_to_hex(repl), p->pack_name); |
31877c9a | 1665 | obj_read_unlock(); |
f5552aee | 1666 | |
b6c4cecc | 1667 | return NULL; |
ac939109 NP |
1668 | } |
1669 | ||
d3b4705a NTND |
1670 | void *read_object_with_reference(struct repository *r, |
1671 | const struct object_id *oid, | |
21666f1a | 1672 | const char *required_type_name, |
40469ee9 | 1673 | unsigned long *size, |
02f0547e | 1674 | struct object_id *actual_oid_return) |
f4913f91 | 1675 | { |
21666f1a | 1676 | enum object_type type, required_type; |
f4913f91 JH |
1677 | void *buffer; |
1678 | unsigned long isize; | |
02f0547e | 1679 | struct object_id actual_oid; |
f4913f91 | 1680 | |
21666f1a | 1681 | required_type = type_from_string(required_type_name); |
02f0547e | 1682 | oidcpy(&actual_oid, oid); |
40469ee9 JH |
1683 | while (1) { |
1684 | int ref_length = -1; | |
1685 | const char *ref_type = NULL; | |
f4913f91 | 1686 | |
d3b4705a | 1687 | buffer = repo_read_object_file(r, &actual_oid, &type, &isize); |
40469ee9 JH |
1688 | if (!buffer) |
1689 | return NULL; | |
21666f1a | 1690 | if (type == required_type) { |
40469ee9 | 1691 | *size = isize; |
02f0547e | 1692 | if (actual_oid_return) |
1693 | oidcpy(actual_oid_return, &actual_oid); | |
40469ee9 JH |
1694 | return buffer; |
1695 | } | |
1696 | /* Handle references */ | |
21666f1a | 1697 | else if (type == OBJ_COMMIT) |
40469ee9 | 1698 | ref_type = "tree "; |
21666f1a | 1699 | else if (type == OBJ_TAG) |
40469ee9 JH |
1700 | ref_type = "object "; |
1701 | else { | |
1702 | free(buffer); | |
1703 | return NULL; | |
1704 | } | |
1705 | ref_length = strlen(ref_type); | |
f4913f91 | 1706 | |
94b5e093 | 1707 | if (ref_length + the_hash_algo->hexsz > isize || |
50974ec9 | 1708 | memcmp(buffer, ref_type, ref_length) || |
02f0547e | 1709 | get_oid_hex((char *) buffer + ref_length, &actual_oid)) { |
40469ee9 JH |
1710 | free(buffer); |
1711 | return NULL; | |
1712 | } | |
1cf58e72 | 1713 | free(buffer); |
40469ee9 | 1714 | /* Now we have the ID of the referred-to object in |
02f0547e | 1715 | * actual_oid. Check again. */ |
f4913f91 | 1716 | } |
f4913f91 JH |
1717 | } |
1718 | ||
7ad5c44d MT |
1719 | static void write_object_file_prepare(const struct git_hash_algo *algo, |
1720 | const void *buf, unsigned long len, | |
a09c985e PO |
1721 | const char *type, struct object_id *oid, |
1722 | char *hdr, int *hdrlen) | |
d410c0f5 | 1723 | { |
18e2588e | 1724 | git_hash_ctx c; |
d410c0f5 JH |
1725 | |
1726 | /* Generate the header */ | |
ca473cef | 1727 | *hdrlen = xsnprintf(hdr, *hdrlen, "%s %"PRIuMAX , type, (uintmax_t)len)+1; |
d410c0f5 JH |
1728 | |
1729 | /* Sha1.. */ | |
7ad5c44d MT |
1730 | algo->init_fn(&c); |
1731 | algo->update_fn(&c, hdr, *hdrlen); | |
1732 | algo->update_fn(&c, buf, len); | |
1733 | algo->final_fn(oid->hash, &c); | |
d410c0f5 JH |
1734 | } |
1735 | ||
230f1322 | 1736 | /* |
5a688fe4 | 1737 | * Move the just written object into its final resting place. |
230f1322 | 1738 | */ |
cb5add58 | 1739 | int finalize_object_file(const char *tmpfile, const char *filename) |
230f1322 | 1740 | { |
e32c0a9c | 1741 | int ret = 0; |
5a688fe4 | 1742 | |
348df166 | 1743 | if (object_creation_mode == OBJECT_CREATION_USES_RENAMES) |
be66a6c4 JS |
1744 | goto try_rename; |
1745 | else if (link(tmpfile, filename)) | |
e32c0a9c | 1746 | ret = errno; |
7ebb6fca LT |
1747 | |
1748 | /* | |
1749 | * Coda hack - coda doesn't like cross-directory links, | |
1750 | * so we fall back to a rename, which will mean that it | |
1751 | * won't be able to check collisions, but that's not a | |
1752 | * big deal. | |
1753 | * | |
1754 | * The same holds for FAT formatted media. | |
1755 | * | |
3be1f18e | 1756 | * When this succeeds, we just return. We have nothing |
7ebb6fca LT |
1757 | * left to unlink. |
1758 | */ | |
1759 | if (ret && ret != EEXIST) { | |
be66a6c4 | 1760 | try_rename: |
7ebb6fca | 1761 | if (!rename(tmpfile, filename)) |
3be1f18e | 1762 | goto out; |
9e48b389 | 1763 | ret = errno; |
230f1322 | 1764 | } |
691f1a28 | 1765 | unlink_or_warn(tmpfile); |
230f1322 LT |
1766 | if (ret) { |
1767 | if (ret != EEXIST) { | |
2c319886 | 1768 | return error_errno(_("unable to write file %s"), filename); |
230f1322 LT |
1769 | } |
1770 | /* FIXME!!! Collision check here ? */ | |
1771 | } | |
1772 | ||
3be1f18e | 1773 | out: |
5256b006 | 1774 | if (adjust_shared_perm(filename)) |
259328b7 | 1775 | return error(_("unable to set permission to '%s'"), filename); |
230f1322 LT |
1776 | return 0; |
1777 | } | |
1778 | ||
4d548150 LT |
1779 | static int write_buffer(int fd, const void *buf, size_t len) |
1780 | { | |
d34cf19b | 1781 | if (write_in_full(fd, buf, len) < 0) |
259328b7 | 1782 | return error_errno(_("file write error")); |
4d548150 LT |
1783 | return 0; |
1784 | } | |
1785 | ||
2dcde20e MT |
1786 | int hash_object_file(const struct git_hash_algo *algo, const void *buf, |
1787 | unsigned long len, const char *type, | |
f070facc | 1788 | struct object_id *oid) |
abdc3fc8 | 1789 | { |
1af64f73 | 1790 | char hdr[MAX_HEADER_LEN]; |
ef1286d3 | 1791 | int hdrlen = sizeof(hdr); |
2dcde20e | 1792 | write_object_file_prepare(algo, buf, len, type, oid, hdr, &hdrlen); |
abdc3fc8 RS |
1793 | return 0; |
1794 | } | |
1795 | ||
e9039dd3 | 1796 | /* Finalize a file on disk, and close it. */ |
514c5fdd | 1797 | static void close_loose_object(int fd) |
e9039dd3 | 1798 | { |
aafe9fba | 1799 | if (fsync_object_files) |
76011357 | 1800 | fsync_or_die(fd, "loose object file"); |
e9039dd3 | 1801 | if (close(fd) != 0) |
76011357 | 1802 | die_errno(_("error when closing loose object file")); |
e9039dd3 LT |
1803 | } |
1804 | ||
5723fe7e LT |
1805 | /* Size of directory component, including the ending '/' */ |
1806 | static inline int directory_size(const char *filename) | |
1807 | { | |
1808 | const char *s = strrchr(filename, '/'); | |
1809 | if (!s) | |
1810 | return 0; | |
1811 | return s - filename + 1; | |
1812 | } | |
1813 | ||
1814 | /* | |
1815 | * This creates a temporary file in the same directory as the final | |
1816 | * 'filename' | |
1817 | * | |
1818 | * We want to avoid cross-directory filename renames, because those | |
1819 | * can have problems on various filesystems (FAT, NFS, Coda). | |
1820 | */ | |
d4b3d11a | 1821 | static int create_tmpfile(struct strbuf *tmp, const char *filename) |
5723fe7e LT |
1822 | { |
1823 | int fd, dirlen = directory_size(filename); | |
1824 | ||
d4b3d11a JK |
1825 | strbuf_reset(tmp); |
1826 | strbuf_add(tmp, filename, dirlen); | |
1827 | strbuf_addstr(tmp, "tmp_obj_XXXXXX"); | |
1828 | fd = git_mkstemp_mode(tmp->buf, 0444); | |
cbacbf4e | 1829 | if (fd < 0 && dirlen && errno == ENOENT) { |
d4b3d11a JK |
1830 | /* |
1831 | * Make sure the directory exists; note that the contents | |
1832 | * of the buffer are undefined after mkstemp returns an | |
1833 | * error, so we have to rewrite the whole buffer from | |
1834 | * scratch. | |
1835 | */ | |
1836 | strbuf_reset(tmp); | |
1837 | strbuf_add(tmp, filename, dirlen - 1); | |
1838 | if (mkdir(tmp->buf, 0777) && errno != EEXIST) | |
b2476a60 | 1839 | return -1; |
d4b3d11a | 1840 | if (adjust_shared_perm(tmp->buf)) |
5723fe7e LT |
1841 | return -1; |
1842 | ||
1843 | /* Try again */ | |
d4b3d11a JK |
1844 | strbuf_addstr(tmp, "/tmp_obj_XXXXXX"); |
1845 | fd = git_mkstemp_mode(tmp->buf, 0444); | |
5723fe7e LT |
1846 | } |
1847 | return fd; | |
1848 | } | |
1849 | ||
3fc7281f PO |
1850 | static int write_loose_object(const struct object_id *oid, char *hdr, |
1851 | int hdrlen, const void *buf, unsigned long len, | |
1852 | time_t mtime) | |
0fcfd160 | 1853 | { |
915308b1 | 1854 | int fd, ret; |
9892beba | 1855 | unsigned char compressed[4096]; |
ef49a7a0 | 1856 | git_zstream stream; |
18e2588e | 1857 | git_hash_ctx c; |
3fc7281f | 1858 | struct object_id parano_oid; |
d4b3d11a | 1859 | static struct strbuf tmp_file = STRBUF_INIT; |
ea657730 CC |
1860 | static struct strbuf filename = STRBUF_INIT; |
1861 | ||
514c5fdd | 1862 | loose_object_path(the_repository, &filename, oid); |
a44c9a5e | 1863 | |
ea657730 | 1864 | fd = create_tmpfile(&tmp_file, filename.buf); |
aac17941 | 1865 | if (fd < 0) { |
35243577 | 1866 | if (errno == EACCES) |
259328b7 | 1867 | return error(_("insufficient permission for adding an object to repository database %s"), get_object_directory()); |
916d081b | 1868 | else |
259328b7 | 1869 | return error_errno(_("unable to create temporary file")); |
aac17941 LT |
1870 | } |
1871 | ||
0fcfd160 | 1872 | /* Set it up */ |
55bb5c91 | 1873 | git_deflate_init(&stream, zlib_compression_level); |
0fcfd160 | 1874 | stream.next_out = compressed; |
9892beba | 1875 | stream.avail_out = sizeof(compressed); |
18e2588e | 1876 | the_hash_algo->init_fn(&c); |
a44c9a5e LT |
1877 | |
1878 | /* First header.. */ | |
d65a16f6 | 1879 | stream.next_in = (unsigned char *)hdr; |
a44c9a5e | 1880 | stream.avail_in = hdrlen; |
55bb5c91 JH |
1881 | while (git_deflate(&stream, 0) == Z_OK) |
1882 | ; /* nothing */ | |
18e2588e | 1883 | the_hash_algo->update_fn(&c, hdr, hdrlen); |
a44c9a5e LT |
1884 | |
1885 | /* Then the data itself.. */ | |
c00e657d | 1886 | stream.next_in = (void *)buf; |
a44c9a5e | 1887 | stream.avail_in = len; |
9892beba | 1888 | do { |
748af44c | 1889 | unsigned char *in0 = stream.next_in; |
55bb5c91 | 1890 | ret = git_deflate(&stream, Z_FINISH); |
18e2588e | 1891 | the_hash_algo->update_fn(&c, in0, stream.next_in - in0); |
9892beba | 1892 | if (write_buffer(fd, compressed, stream.next_out - compressed) < 0) |
76011357 | 1893 | die(_("unable to write loose object file")); |
9892beba NP |
1894 | stream.next_out = compressed; |
1895 | stream.avail_out = sizeof(compressed); | |
1896 | } while (ret == Z_OK); | |
1897 | ||
ac54c277 | 1898 | if (ret != Z_STREAM_END) |
259328b7 | 1899 | die(_("unable to deflate new object %s (%d)"), oid_to_hex(oid), |
3fc7281f | 1900 | ret); |
55bb5c91 | 1901 | ret = git_deflate_end_gently(&stream); |
ac54c277 | 1902 | if (ret != Z_OK) |
259328b7 | 1903 | die(_("deflateEnd on object %s failed (%d)"), oid_to_hex(oid), |
3fc7281f | 1904 | ret); |
18e2588e | 1905 | the_hash_algo->final_fn(parano_oid.hash, &c); |
9001dc2a | 1906 | if (!oideq(oid, ¶no_oid)) |
259328b7 | 1907 | die(_("confused by unstable object source data for %s"), |
3fc7281f | 1908 | oid_to_hex(oid)); |
ac54c277 | 1909 | |
514c5fdd | 1910 | close_loose_object(fd); |
0fcfd160 | 1911 | |
bbac7311 NP |
1912 | if (mtime) { |
1913 | struct utimbuf utb; | |
1914 | utb.actime = mtime; | |
1915 | utb.modtime = mtime; | |
d4b3d11a | 1916 | if (utime(tmp_file.buf, &utb) < 0) |
259328b7 | 1917 | warning_errno(_("failed utime() on %s"), tmp_file.buf); |
bbac7311 NP |
1918 | } |
1919 | ||
ea657730 | 1920 | return finalize_object_file(tmp_file.buf, filename.buf); |
0fcfd160 | 1921 | } |
8237b185 | 1922 | |
6862ebbf | 1923 | static int freshen_loose_object(const struct object_id *oid) |
33d4221c | 1924 | { |
6862ebbf | 1925 | return check_and_freshen(oid, 1); |
33d4221c JK |
1926 | } |
1927 | ||
6862ebbf | 1928 | static int freshen_packed_object(const struct object_id *oid) |
33d4221c JK |
1929 | { |
1930 | struct pack_entry e; | |
544443cb | 1931 | if (!find_pack_entry(the_repository, oid, &e)) |
ee1c6c34 JK |
1932 | return 0; |
1933 | if (e.p->freshened) | |
1934 | return 1; | |
1935 | if (!freshen_file(e.p->pack_name)) | |
1936 | return 0; | |
1937 | e.p->freshened = 1; | |
1938 | return 1; | |
33d4221c JK |
1939 | } |
1940 | ||
a09c985e PO |
1941 | int write_object_file(const void *buf, unsigned long len, const char *type, |
1942 | struct object_id *oid) | |
bbac7311 | 1943 | { |
1af64f73 | 1944 | char hdr[MAX_HEADER_LEN]; |
ef1286d3 | 1945 | int hdrlen = sizeof(hdr); |
bbac7311 NP |
1946 | |
1947 | /* Normally if we have it in the pack then we do not bother writing | |
1948 | * it out into .git/objects/??/?{38} file. | |
1949 | */ | |
7ad5c44d MT |
1950 | write_object_file_prepare(the_hash_algo, buf, len, type, oid, hdr, |
1951 | &hdrlen); | |
6862ebbf | 1952 | if (freshen_packed_object(oid) || freshen_loose_object(oid)) |
bbac7311 | 1953 | return 0; |
3fc7281f | 1954 | return write_loose_object(oid, hdr, hdrlen, buf, len, 0); |
bbac7311 NP |
1955 | } |
1956 | ||
1752cbbc PO |
1957 | int hash_object_file_literally(const void *buf, unsigned long len, |
1958 | const char *type, struct object_id *oid, | |
1959 | unsigned flags) | |
0c3db67c ES |
1960 | { |
1961 | char *header; | |
1962 | int hdrlen, status = 0; | |
1963 | ||
1964 | /* type string, SP, %lu of the length plus NUL must fit this */ | |
1af64f73 | 1965 | hdrlen = strlen(type) + MAX_HEADER_LEN; |
ef1286d3 | 1966 | header = xmalloc(hdrlen); |
7ad5c44d MT |
1967 | write_object_file_prepare(the_hash_algo, buf, len, type, oid, header, |
1968 | &hdrlen); | |
0c3db67c ES |
1969 | |
1970 | if (!(flags & HASH_WRITE_OBJECT)) | |
1971 | goto cleanup; | |
6862ebbf | 1972 | if (freshen_packed_object(oid) || freshen_loose_object(oid)) |
0c3db67c | 1973 | goto cleanup; |
3fc7281f | 1974 | status = write_loose_object(oid, header, hdrlen, buf, len, 0); |
0c3db67c ES |
1975 | |
1976 | cleanup: | |
1977 | free(header); | |
1978 | return status; | |
1979 | } | |
1980 | ||
4bdb70a4 | 1981 | int force_object_loose(const struct object_id *oid, time_t mtime) |
bbac7311 | 1982 | { |
bbac7311 NP |
1983 | void *buf; |
1984 | unsigned long len; | |
1985 | enum object_type type; | |
1af64f73 | 1986 | char hdr[MAX_HEADER_LEN]; |
bbac7311 | 1987 | int hdrlen; |
1fb23e65 | 1988 | int ret; |
bbac7311 | 1989 | |
6862ebbf | 1990 | if (has_loose_object(oid)) |
bbac7311 | 1991 | return 0; |
cba595ab | 1992 | buf = read_object(the_repository, oid, &type, &len); |
bbac7311 | 1993 | if (!buf) |
2c319886 | 1994 | return error(_("cannot read object for %s"), oid_to_hex(oid)); |
ca473cef | 1995 | hdrlen = xsnprintf(hdr, sizeof(hdr), "%s %"PRIuMAX , type_name(type), (uintmax_t)len) + 1; |
3fc7281f | 1996 | ret = write_loose_object(oid, hdr, hdrlen, buf, len, mtime); |
1fb23e65 BS |
1997 | free(buf); |
1998 | ||
1999 | return ret; | |
bbac7311 NP |
2000 | } |
2001 | ||
1d8d9cb6 JT |
2002 | int has_object(struct repository *r, const struct object_id *oid, |
2003 | unsigned flags) | |
2004 | { | |
2005 | int quick = !(flags & HAS_OBJECT_RECHECK_PACKED); | |
2006 | unsigned object_info_flags = OBJECT_INFO_SKIP_FETCH_OBJECT | | |
2007 | (quick ? OBJECT_INFO_QUICK : 0); | |
2008 | ||
2009 | if (!startup_info->have_repository) | |
2010 | return 0; | |
2011 | return oid_object_info_extended(r, oid, NULL, object_info_flags) >= 0; | |
2012 | } | |
2013 | ||
cba595ab JH |
2014 | int repo_has_object_file_with_flags(struct repository *r, |
2015 | const struct object_id *oid, int flags) | |
8237b185 | 2016 | { |
3e8b7d3c JN |
2017 | if (!startup_info->have_repository) |
2018 | return 0; | |
9c8a294a | 2019 | return oid_object_info_extended(r, oid, NULL, flags) >= 0; |
b419aa25 | 2020 | } |
2021 | ||
9b45f499 SB |
2022 | int repo_has_object_file(struct repository *r, |
2023 | const struct object_id *oid) | |
b419aa25 | 2024 | { |
cba595ab | 2025 | return repo_has_object_file_with_flags(r, oid, 0); |
5827a035 JK |
2026 | } |
2027 | ||
c879daa2 NTND |
2028 | static void check_tree(const void *buf, size_t size) |
2029 | { | |
2030 | struct tree_desc desc; | |
2031 | struct name_entry entry; | |
2032 | ||
2033 | init_tree_desc(&desc, buf, size); | |
2034 | while (tree_entry(&desc, &entry)) | |
2035 | /* do nothing | |
2036 | * tree_entry() will die() on malformed entries */ | |
2037 | ; | |
2038 | } | |
2039 | ||
2040 | static void check_commit(const void *buf, size_t size) | |
2041 | { | |
2042 | struct commit c; | |
2043 | memset(&c, 0, sizeof(c)); | |
08f4f445 | 2044 | if (parse_commit_buffer(the_repository, &c, buf, size, 0)) |
259328b7 | 2045 | die(_("corrupt commit")); |
c879daa2 NTND |
2046 | } |
2047 | ||
2048 | static void check_tag(const void *buf, size_t size) | |
2049 | { | |
2050 | struct tag t; | |
2051 | memset(&t, 0, sizeof(t)); | |
0e740fed | 2052 | if (parse_tag_buffer(the_repository, &t, buf, size)) |
259328b7 | 2053 | die(_("corrupt tag")); |
c879daa2 NTND |
2054 | } |
2055 | ||
58bf2a4c NTND |
2056 | static int index_mem(struct index_state *istate, |
2057 | struct object_id *oid, void *buf, size_t size, | |
c4ce46fc JH |
2058 | enum object_type type, |
2059 | const char *path, unsigned flags) | |
e7332f96 | 2060 | { |
6c510bee | 2061 | int ret, re_allocated = 0; |
c4ce46fc | 2062 | int write_object = flags & HASH_WRITE_OBJECT; |
74400e71 | 2063 | |
7672db20 | 2064 | if (!type) |
edaec3fb | 2065 | type = OBJ_BLOB; |
6c510bee LT |
2066 | |
2067 | /* | |
2068 | * Convert blobs to git internal format | |
2069 | */ | |
43df4f86 | 2070 | if ((type == OBJ_BLOB) && path) { |
f285a2d7 | 2071 | struct strbuf nbuf = STRBUF_INIT; |
58bf2a4c | 2072 | if (convert_to_git(istate, path, buf, size, &nbuf, |
8462ff43 | 2073 | get_conv_flags(flags))) { |
b315c5c0 | 2074 | buf = strbuf_detach(&nbuf, &size); |
6c510bee LT |
2075 | re_allocated = 1; |
2076 | } | |
2077 | } | |
c4ce46fc | 2078 | if (flags & HASH_FORMAT_CHECK) { |
c879daa2 NTND |
2079 | if (type == OBJ_TREE) |
2080 | check_tree(buf, size); | |
2081 | if (type == OBJ_COMMIT) | |
2082 | check_commit(buf, size); | |
2083 | if (type == OBJ_TAG) | |
2084 | check_tag(buf, size); | |
2085 | } | |
6c510bee | 2086 | |
7672db20 | 2087 | if (write_object) |
169c9c01 | 2088 | ret = write_object_file(buf, size, type_name(type), oid); |
abdc3fc8 | 2089 | else |
2dcde20e MT |
2090 | ret = hash_object_file(the_hash_algo, buf, size, |
2091 | type_name(type), oid); | |
43df4f86 | 2092 | if (re_allocated) |
6c510bee | 2093 | free(buf); |
43df4f86 DP |
2094 | return ret; |
2095 | } | |
2096 | ||
58bf2a4c NTND |
2097 | static int index_stream_convert_blob(struct index_state *istate, |
2098 | struct object_id *oid, | |
2099 | int fd, | |
2100 | const char *path, | |
2101 | unsigned flags) | |
9035d75a SP |
2102 | { |
2103 | int ret; | |
2104 | const int write_object = flags & HASH_WRITE_OBJECT; | |
2105 | struct strbuf sbuf = STRBUF_INIT; | |
2106 | ||
2107 | assert(path); | |
58bf2a4c | 2108 | assert(would_convert_to_git_filter_fd(istate, path)); |
9035d75a | 2109 | |
58bf2a4c | 2110 | convert_to_git_filter_fd(istate, path, fd, &sbuf, |
8462ff43 | 2111 | get_conv_flags(flags)); |
9035d75a SP |
2112 | |
2113 | if (write_object) | |
169c9c01 | 2114 | ret = write_object_file(sbuf.buf, sbuf.len, type_name(OBJ_BLOB), |
a09c985e | 2115 | oid); |
9035d75a | 2116 | else |
2dcde20e MT |
2117 | ret = hash_object_file(the_hash_algo, sbuf.buf, sbuf.len, |
2118 | type_name(OBJ_BLOB), oid); | |
9035d75a SP |
2119 | strbuf_release(&sbuf); |
2120 | return ret; | |
2121 | } | |
2122 | ||
58bf2a4c NTND |
2123 | static int index_pipe(struct index_state *istate, struct object_id *oid, |
2124 | int fd, enum object_type type, | |
7b41e1e1 JH |
2125 | const char *path, unsigned flags) |
2126 | { | |
2127 | struct strbuf sbuf = STRBUF_INIT; | |
2128 | int ret; | |
2129 | ||
2130 | if (strbuf_read(&sbuf, fd, 4096) >= 0) | |
58bf2a4c | 2131 | ret = index_mem(istate, oid, sbuf.buf, sbuf.len, type, path, flags); |
7b41e1e1 JH |
2132 | else |
2133 | ret = -1; | |
2134 | strbuf_release(&sbuf); | |
2135 | return ret; | |
2136 | } | |
2137 | ||
ea68b0ce DP |
2138 | #define SMALL_FILE_SIZE (32*1024) |
2139 | ||
58bf2a4c NTND |
2140 | static int index_core(struct index_state *istate, |
2141 | struct object_id *oid, int fd, size_t size, | |
7b41e1e1 JH |
2142 | enum object_type type, const char *path, |
2143 | unsigned flags) | |
43df4f86 DP |
2144 | { |
2145 | int ret; | |
43df4f86 | 2146 | |
7b41e1e1 | 2147 | if (!size) { |
58bf2a4c | 2148 | ret = index_mem(istate, oid, "", size, type, path, flags); |
ea68b0ce DP |
2149 | } else if (size <= SMALL_FILE_SIZE) { |
2150 | char *buf = xmalloc(size); | |
90dca671 JK |
2151 | ssize_t read_result = read_in_full(fd, buf, size); |
2152 | if (read_result < 0) | |
259328b7 | 2153 | ret = error_errno(_("read error while indexing %s"), |
90dca671 JK |
2154 | path ? path : "<unknown>"); |
2155 | else if (read_result != size) | |
259328b7 | 2156 | ret = error(_("short read while indexing %s"), |
90dca671 | 2157 | path ? path : "<unknown>"); |
ea68b0ce | 2158 | else |
58bf2a4c | 2159 | ret = index_mem(istate, oid, buf, size, type, path, flags); |
ea68b0ce | 2160 | free(buf); |
08bda208 | 2161 | } else { |
43df4f86 | 2162 | void *buf = xmmap(NULL, size, PROT_READ, MAP_PRIVATE, fd, 0); |
58bf2a4c | 2163 | ret = index_mem(istate, oid, buf, size, type, path, flags); |
aac17941 | 2164 | munmap(buf, size); |
08bda208 | 2165 | } |
7b41e1e1 JH |
2166 | return ret; |
2167 | } | |
2168 | ||
4dd1fbc7 | 2169 | /* |
568508e7 JH |
2170 | * This creates one packfile per large blob unless bulk-checkin |
2171 | * machinery is "plugged". | |
4dd1fbc7 JH |
2172 | * |
2173 | * This also bypasses the usual "convert-to-git" dance, and that is on | |
2174 | * purpose. We could write a streaming version of the converting | |
2175 | * functions and insert that before feeding the data to fast-import | |
4f22b101 JK |
2176 | * (or equivalent in-core API described above). However, that is |
2177 | * somewhat complicated, as we do not know the size of the filter | |
2178 | * result, which we need to know beforehand when writing a git object. | |
2179 | * Since the primary motivation for trying to stream from the working | |
2180 | * tree file and to avoid mmaping it in core is to deal with large | |
2181 | * binary blobs, they generally do not want to get any conversion, and | |
2182 | * callers should avoid this code path when filters are requested. | |
4dd1fbc7 | 2183 | */ |
7d5e1dc3 | 2184 | static int index_stream(struct object_id *oid, int fd, size_t size, |
4dd1fbc7 JH |
2185 | enum object_type type, const char *path, |
2186 | unsigned flags) | |
2187 | { | |
68ee6dfc | 2188 | return index_bulk_checkin(oid, fd, size, type, path, flags); |
4dd1fbc7 JH |
2189 | } |
2190 | ||
58bf2a4c NTND |
2191 | int index_fd(struct index_state *istate, struct object_id *oid, |
2192 | int fd, struct stat *st, | |
7b41e1e1 JH |
2193 | enum object_type type, const char *path, unsigned flags) |
2194 | { | |
2195 | int ret; | |
7b41e1e1 | 2196 | |
9079ab7c SP |
2197 | /* |
2198 | * Call xsize_t() only when needed to avoid potentially unnecessary | |
2199 | * die() for large files. | |
2200 | */ | |
58bf2a4c NTND |
2201 | if (type == OBJ_BLOB && path && would_convert_to_git_filter_fd(istate, path)) |
2202 | ret = index_stream_convert_blob(istate, oid, fd, path, flags); | |
9035d75a | 2203 | else if (!S_ISREG(st->st_mode)) |
58bf2a4c | 2204 | ret = index_pipe(istate, oid, fd, type, path, flags); |
9079ab7c | 2205 | else if (st->st_size <= big_file_threshold || type != OBJ_BLOB || |
58bf2a4c NTND |
2206 | (path && would_convert_to_git(istate, path))) |
2207 | ret = index_core(istate, oid, fd, xsize_t(st->st_size), | |
2208 | type, path, flags); | |
4dd1fbc7 | 2209 | else |
7d5e1dc3 | 2210 | ret = index_stream(oid, fd, xsize_t(st->st_size), type, path, |
9079ab7c | 2211 | flags); |
43df4f86 | 2212 | close(fd); |
aac17941 | 2213 | return ret; |
74400e71 | 2214 | } |
ec1fcc16 | 2215 | |
58bf2a4c NTND |
2216 | int index_path(struct index_state *istate, struct object_id *oid, |
2217 | const char *path, struct stat *st, unsigned flags) | |
ec1fcc16 JH |
2218 | { |
2219 | int fd; | |
b760d3aa | 2220 | struct strbuf sb = STRBUF_INIT; |
ea8e0297 | 2221 | int rc = 0; |
ec1fcc16 JH |
2222 | |
2223 | switch (st->st_mode & S_IFMT) { | |
2224 | case S_IFREG: | |
2225 | fd = open(path, O_RDONLY); | |
2226 | if (fd < 0) | |
7616c6ca | 2227 | return error_errno("open(\"%s\")", path); |
58bf2a4c | 2228 | if (index_fd(istate, oid, fd, st, OBJ_BLOB, path, flags) < 0) |
259328b7 | 2229 | return error(_("%s: failed to insert into database"), |
ec1fcc16 JH |
2230 | path); |
2231 | break; | |
2232 | case S_IFLNK: | |
7616c6ca NTND |
2233 | if (strbuf_readlink(&sb, path, st->st_size)) |
2234 | return error_errno("readlink(\"%s\")", path); | |
c4ce46fc | 2235 | if (!(flags & HASH_WRITE_OBJECT)) |
2dcde20e MT |
2236 | hash_object_file(the_hash_algo, sb.buf, sb.len, |
2237 | blob_type, oid); | |
a09c985e | 2238 | else if (write_object_file(sb.buf, sb.len, blob_type, oid)) |
259328b7 | 2239 | rc = error(_("%s: failed to insert into database"), path); |
b760d3aa | 2240 | strbuf_release(&sb); |
ec1fcc16 | 2241 | break; |
f35a6d3b | 2242 | case S_IFDIR: |
a98e6101 | 2243 | return resolve_gitlink_ref(path, "HEAD", oid); |
ec1fcc16 | 2244 | default: |
259328b7 | 2245 | return error(_("%s: unsupported file type"), path); |
ec1fcc16 | 2246 | } |
ea8e0297 | 2247 | return rc; |
ec1fcc16 | 2248 | } |
a69e5429 JH |
2249 | |
2250 | int read_pack_header(int fd, struct pack_header *header) | |
2251 | { | |
f48ecd38 | 2252 | if (read_in_full(fd, header, sizeof(*header)) != sizeof(*header)) |
c697ad14 HO |
2253 | /* "eof before pack header was fully read" */ |
2254 | return PH_ERROR_EOF; | |
2255 | ||
a69e5429 JH |
2256 | if (header->hdr_signature != htonl(PACK_SIGNATURE)) |
2257 | /* "protocol error (pack signature mismatch detected)" */ | |
2258 | return PH_ERROR_PACK_SIGNATURE; | |
2259 | if (!pack_version_ok(header->hdr_version)) | |
2260 | /* "protocol error (pack version unsupported)" */ | |
2261 | return PH_ERROR_PROTOCOL; | |
2262 | return 0; | |
2263 | } | |
40d52ff7 | 2264 | |
e816caa0 | 2265 | void assert_oid_type(const struct object_id *oid, enum object_type expect) |
40d52ff7 | 2266 | { |
0df8e965 | 2267 | enum object_type type = oid_object_info(the_repository, oid, NULL); |
40d52ff7 | 2268 | if (type < 0) |
259328b7 | 2269 | die(_("%s is not a valid object"), oid_to_hex(oid)); |
40d52ff7 | 2270 | if (type != expect) |
259328b7 | 2271 | die(_("%s is not a valid '%s' object"), oid_to_hex(oid), |
debca9d2 | 2272 | type_name(expect)); |
40d52ff7 | 2273 | } |
27e1e22d | 2274 | |
70c49050 | 2275 | int for_each_file_in_obj_subdir(unsigned int subdir_nr, |
cc817ca3 RS |
2276 | struct strbuf *path, |
2277 | each_loose_object_fn obj_cb, | |
2278 | each_loose_cruft_fn cruft_cb, | |
2279 | each_loose_subdir_fn subdir_cb, | |
2280 | void *data) | |
27e1e22d | 2281 | { |
0375f472 RS |
2282 | size_t origlen, baselen; |
2283 | DIR *dir; | |
27e1e22d JK |
2284 | struct dirent *de; |
2285 | int r = 0; | |
62a24c89 | 2286 | struct object_id oid; |
27e1e22d | 2287 | |
70c49050 RS |
2288 | if (subdir_nr > 0xff) |
2289 | BUG("invalid loose object subdirectory: %x", subdir_nr); | |
2290 | ||
0375f472 RS |
2291 | origlen = path->len; |
2292 | strbuf_complete(path, '/'); | |
2293 | strbuf_addf(path, "%02x", subdir_nr); | |
0375f472 RS |
2294 | |
2295 | dir = opendir(path->buf); | |
27e1e22d | 2296 | if (!dir) { |
0375f472 | 2297 | if (errno != ENOENT) |
259328b7 | 2298 | r = error_errno(_("unable to open %s"), path->buf); |
0375f472 RS |
2299 | strbuf_setlen(path, origlen); |
2300 | return r; | |
27e1e22d JK |
2301 | } |
2302 | ||
62a24c89 | 2303 | oid.hash[0] = subdir_nr; |
163ee5e6 DS |
2304 | strbuf_addch(path, '/'); |
2305 | baselen = path->len; | |
62a24c89 | 2306 | |
27e1e22d | 2307 | while ((de = readdir(dir))) { |
163ee5e6 | 2308 | size_t namelen; |
27e1e22d JK |
2309 | if (is_dot_or_dotdot(de->d_name)) |
2310 | continue; | |
2311 | ||
163ee5e6 | 2312 | namelen = strlen(de->d_name); |
27e1e22d | 2313 | strbuf_setlen(path, baselen); |
163ee5e6 | 2314 | strbuf_add(path, de->d_name, namelen); |
94b5e093 | 2315 | if (namelen == the_hash_algo->hexsz - 2 && |
62a24c89 | 2316 | !hex_to_bytes(oid.hash + 1, de->d_name, |
94b5e093 | 2317 | the_hash_algo->rawsz - 1)) { |
62a24c89 RS |
2318 | if (obj_cb) { |
2319 | r = obj_cb(&oid, path->buf, data); | |
2320 | if (r) | |
2321 | break; | |
27e1e22d | 2322 | } |
62a24c89 | 2323 | continue; |
27e1e22d JK |
2324 | } |
2325 | ||
2326 | if (cruft_cb) { | |
2327 | r = cruft_cb(de->d_name, path->buf, data); | |
2328 | if (r) | |
2329 | break; | |
2330 | } | |
2331 | } | |
094c7e63 | 2332 | closedir(dir); |
27e1e22d | 2333 | |
163ee5e6 | 2334 | strbuf_setlen(path, baselen - 1); |
27e1e22d JK |
2335 | if (!r && subdir_cb) |
2336 | r = subdir_cb(subdir_nr, path->buf, data); | |
2337 | ||
0375f472 RS |
2338 | strbuf_setlen(path, origlen); |
2339 | ||
27e1e22d JK |
2340 | return r; |
2341 | } | |
2342 | ||
e6f875e0 | 2343 | int for_each_loose_file_in_objdir_buf(struct strbuf *path, |
27e1e22d JK |
2344 | each_loose_object_fn obj_cb, |
2345 | each_loose_cruft_fn cruft_cb, | |
2346 | each_loose_subdir_fn subdir_cb, | |
2347 | void *data) | |
2348 | { | |
27e1e22d JK |
2349 | int r = 0; |
2350 | int i; | |
2351 | ||
27e1e22d | 2352 | for (i = 0; i < 256; i++) { |
e6f875e0 | 2353 | r = for_each_file_in_obj_subdir(i, path, obj_cb, cruft_cb, |
27e1e22d | 2354 | subdir_cb, data); |
27e1e22d JK |
2355 | if (r) |
2356 | break; | |
2357 | } | |
2358 | ||
e6f875e0 JK |
2359 | return r; |
2360 | } | |
2361 | ||
2362 | int for_each_loose_file_in_objdir(const char *path, | |
2363 | each_loose_object_fn obj_cb, | |
2364 | each_loose_cruft_fn cruft_cb, | |
2365 | each_loose_subdir_fn subdir_cb, | |
2366 | void *data) | |
2367 | { | |
2368 | struct strbuf buf = STRBUF_INIT; | |
2369 | int r; | |
2370 | ||
2371 | strbuf_addstr(&buf, path); | |
2372 | r = for_each_loose_file_in_objdir_buf(&buf, obj_cb, cruft_cb, | |
2373 | subdir_cb, data); | |
27e1e22d | 2374 | strbuf_release(&buf); |
e6f875e0 | 2375 | |
27e1e22d JK |
2376 | return r; |
2377 | } | |
660c889e | 2378 | |
a7ff6f5a JK |
2379 | int for_each_loose_object(each_loose_object_fn cb, void *data, |
2380 | enum for_each_object_flags flags) | |
660c889e | 2381 | { |
f0eaf638 | 2382 | struct object_directory *odb; |
b0a42642 | 2383 | |
f0eaf638 JK |
2384 | prepare_alt_odb(the_repository); |
2385 | for (odb = the_repository->objects->odb; odb; odb = odb->next) { | |
2386 | int r = for_each_loose_file_in_objdir(odb->path, cb, NULL, | |
2387 | NULL, data); | |
2388 | if (r) | |
2389 | return r; | |
660c889e | 2390 | |
f0eaf638 JK |
2391 | if (flags & FOR_EACH_OBJECT_LOCAL_ONLY) |
2392 | break; | |
2393 | } | |
1385bb7b | 2394 | |
f0eaf638 | 2395 | return 0; |
660c889e JK |
2396 | } |
2397 | ||
3a2e0824 JK |
2398 | static int append_loose_object(const struct object_id *oid, const char *path, |
2399 | void *data) | |
660c889e | 2400 | { |
3a2e0824 JK |
2401 | oid_array_append(data, oid); |
2402 | return 0; | |
2403 | } | |
660c889e | 2404 | |
0000d654 RS |
2405 | struct oid_array *odb_loose_cache(struct object_directory *odb, |
2406 | const struct object_id *oid) | |
2407 | { | |
2408 | int subdir_nr = oid->hash[0]; | |
3a2e0824 | 2409 | struct strbuf buf = STRBUF_INIT; |
660c889e | 2410 | |
3a2e0824 JK |
2411 | if (subdir_nr < 0 || |
2412 | subdir_nr >= ARRAY_SIZE(odb->loose_objects_subdir_seen)) | |
2413 | BUG("subdir_nr out of range"); | |
1385bb7b | 2414 | |
3a2e0824 | 2415 | if (odb->loose_objects_subdir_seen[subdir_nr]) |
8be88dbc | 2416 | return &odb->loose_objects_cache[subdir_nr]; |
3a2e0824 JK |
2417 | |
2418 | strbuf_addstr(&buf, odb->path); | |
2419 | for_each_file_in_obj_subdir(subdir_nr, &buf, | |
2420 | append_loose_object, | |
2421 | NULL, NULL, | |
4cea1ce0 | 2422 | &odb->loose_objects_cache[subdir_nr]); |
3a2e0824 | 2423 | odb->loose_objects_subdir_seen[subdir_nr] = 1; |
7317aa71 | 2424 | strbuf_release(&buf); |
8be88dbc | 2425 | return &odb->loose_objects_cache[subdir_nr]; |
660c889e JK |
2426 | } |
2427 | ||
d4e19e51 RS |
2428 | void odb_clear_loose_cache(struct object_directory *odb) |
2429 | { | |
4cea1ce0 RS |
2430 | int i; |
2431 | ||
2432 | for (i = 0; i < ARRAY_SIZE(odb->loose_objects_cache); i++) | |
2433 | oid_array_clear(&odb->loose_objects_cache[i]); | |
d4e19e51 RS |
2434 | memset(&odb->loose_objects_subdir_seen, 0, |
2435 | sizeof(odb->loose_objects_subdir_seen)); | |
2436 | } | |
2437 | ||
00a7760e JK |
2438 | static int check_stream_oid(git_zstream *stream, |
2439 | const char *hdr, | |
2440 | unsigned long size, | |
2441 | const char *path, | |
2442 | const struct object_id *expected_oid) | |
f6371f92 | 2443 | { |
18e2588e | 2444 | git_hash_ctx c; |
00a7760e | 2445 | struct object_id real_oid; |
f6371f92 JK |
2446 | unsigned char buf[4096]; |
2447 | unsigned long total_read; | |
2448 | int status = Z_OK; | |
2449 | ||
18e2588e | 2450 | the_hash_algo->init_fn(&c); |
2451 | the_hash_algo->update_fn(&c, hdr, stream->total_out); | |
f6371f92 JK |
2452 | |
2453 | /* | |
2454 | * We already read some bytes into hdr, but the ones up to the NUL | |
2455 | * do not count against the object's content size. | |
2456 | */ | |
2457 | total_read = stream->total_out - strlen(hdr) - 1; | |
2458 | ||
2459 | /* | |
2460 | * This size comparison must be "<=" to read the final zlib packets; | |
00a7760e | 2461 | * see the comment in unpack_loose_rest for details. |
f6371f92 JK |
2462 | */ |
2463 | while (total_read <= size && | |
18ad13e5 JH |
2464 | (status == Z_OK || |
2465 | (status == Z_BUF_ERROR && !stream->avail_out))) { | |
f6371f92 JK |
2466 | stream->next_out = buf; |
2467 | stream->avail_out = sizeof(buf); | |
2468 | if (size - total_read < stream->avail_out) | |
2469 | stream->avail_out = size - total_read; | |
2470 | status = git_inflate(stream, Z_FINISH); | |
18e2588e | 2471 | the_hash_algo->update_fn(&c, buf, stream->next_out - buf); |
f6371f92 JK |
2472 | total_read += stream->next_out - buf; |
2473 | } | |
2474 | git_inflate_end(stream); | |
2475 | ||
2476 | if (status != Z_STREAM_END) { | |
00a7760e | 2477 | error(_("corrupt loose object '%s'"), oid_to_hex(expected_oid)); |
f6371f92 JK |
2478 | return -1; |
2479 | } | |
cce044df | 2480 | if (stream->avail_in) { |
259328b7 | 2481 | error(_("garbage at end of loose object '%s'"), |
00a7760e | 2482 | oid_to_hex(expected_oid)); |
cce044df JK |
2483 | return -1; |
2484 | } | |
f6371f92 | 2485 | |
00a7760e JK |
2486 | the_hash_algo->final_fn(real_oid.hash, &c); |
2487 | if (!oideq(expected_oid, &real_oid)) { | |
01f8d594 | 2488 | error(_("hash mismatch for %s (expected %s)"), path, |
00a7760e | 2489 | oid_to_hex(expected_oid)); |
f6371f92 JK |
2490 | return -1; |
2491 | } | |
2492 | ||
2493 | return 0; | |
2494 | } | |
2495 | ||
2496 | int read_loose_object(const char *path, | |
d61d87bd | 2497 | const struct object_id *expected_oid, |
f6371f92 JK |
2498 | enum object_type *type, |
2499 | unsigned long *size, | |
2500 | void **contents) | |
2501 | { | |
2502 | int ret = -1; | |
f6371f92 JK |
2503 | void *map = NULL; |
2504 | unsigned long mapsize; | |
2505 | git_zstream stream; | |
1af64f73 | 2506 | char hdr[MAX_HEADER_LEN]; |
f6371f92 JK |
2507 | |
2508 | *contents = NULL; | |
2509 | ||
514c5fdd | 2510 | map = map_loose_object_1(the_repository, path, NULL, &mapsize); |
f6371f92 | 2511 | if (!map) { |
259328b7 | 2512 | error_errno(_("unable to mmap %s"), path); |
f6371f92 JK |
2513 | goto out; |
2514 | } | |
2515 | ||
00a7760e | 2516 | if (unpack_loose_header(&stream, map, mapsize, hdr, sizeof(hdr)) < 0) { |
259328b7 | 2517 | error(_("unable to unpack header of %s"), path); |
f6371f92 JK |
2518 | goto out; |
2519 | } | |
2520 | ||
00a7760e | 2521 | *type = parse_loose_header(hdr, size); |
f6371f92 | 2522 | if (*type < 0) { |
259328b7 | 2523 | error(_("unable to parse header of %s"), path); |
f6371f92 JK |
2524 | git_inflate_end(&stream); |
2525 | goto out; | |
2526 | } | |
2527 | ||
7ac4f3a0 | 2528 | if (*type == OBJ_BLOB && *size > big_file_threshold) { |
00a7760e | 2529 | if (check_stream_oid(&stream, hdr, *size, path, expected_oid) < 0) |
f6371f92 JK |
2530 | goto out; |
2531 | } else { | |
00a7760e | 2532 | *contents = unpack_loose_rest(&stream, hdr, *size, expected_oid); |
f6371f92 | 2533 | if (!*contents) { |
259328b7 | 2534 | error(_("unable to unpack contents of %s"), path); |
f6371f92 JK |
2535 | git_inflate_end(&stream); |
2536 | goto out; | |
2537 | } | |
b98d1885 MT |
2538 | if (check_object_signature(the_repository, expected_oid, |
2539 | *contents, *size, | |
2540 | type_name(*type))) { | |
01f8d594 | 2541 | error(_("hash mismatch for %s (expected %s)"), path, |
d61d87bd | 2542 | oid_to_hex(expected_oid)); |
f6371f92 JK |
2543 | free(*contents); |
2544 | goto out; | |
2545 | } | |
2546 | } | |
2547 | ||
2548 | ret = 0; /* everything checks out */ | |
2549 | ||
2550 | out: | |
2551 | if (map) | |
2552 | munmap(map, mapsize); | |
f6371f92 JK |
2553 | return ret; |
2554 | } |