Git 2.22
[git/git.git] / sha1-file.c
CommitLineData
0fcfd160
LT
1/*
2 * GIT - The information manager from hell
3 *
4 * Copyright (C) Linus Torvalds, 2005
5 *
6 * This handles basic git sha1 object files - packing, unpacking,
7 * creation etc.
8 */
0fcfd160 9#include "cache.h"
b2141fc1 10#include "config.h"
6eac50d8 11#include "string-list.h"
697cc8ef 12#include "lockfile.h"
1f688557 13#include "delta.h"
a733cb60 14#include "pack.h"
8e440259
PE
15#include "blob.h"
16#include "commit.h"
4dd1fbc7 17#include "run-command.h"
8e440259
PE
18#include "tag.h"
19#include "tree.h"
c879daa2 20#include "tree-walk.h"
f35a6d3b 21#include "refs.h"
70f5d5d3 22#include "pack-revindex.h"
628522ec 23#include "sha1-lookup.h"
568508e7 24#include "bulk-checkin.h"
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"
8b4c0103 33#include "fetch-object.h"
90c62155 34#include "object-store.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
50c5cd58 58const unsigned char null_sha1[GIT_MAX_RAWSZ];
3e56e724 59const struct object_id null_oid;
e1ccd7e2 60static const struct object_id empty_tree_oid = {
8576fde6
JK
61 EMPTY_TREE_SHA1_BIN_LITERAL
62};
e1ccd7e2 63static const struct object_id empty_blob_oid = {
8576fde6
JK
64 EMPTY_BLOB_SHA1_BIN_LITERAL
65};
13eeedb5 66static const struct object_id empty_tree_oid_sha256 = {
67 EMPTY_TREE_SHA256_BIN_LITERAL
68};
69static const struct object_id empty_blob_oid_sha256 = {
70 EMPTY_BLOB_SHA256_BIN_LITERAL
71};
88cd621d 72
ac73cedf 73static void git_hash_sha1_init(git_hash_ctx *ctx)
f50e766b 74{
ac73cedf 75 git_SHA1_Init(&ctx->sha1);
f50e766b 76}
77
ac73cedf 78static void git_hash_sha1_update(git_hash_ctx *ctx, const void *data, size_t len)
f50e766b 79{
ac73cedf 80 git_SHA1_Update(&ctx->sha1, data, len);
f50e766b 81}
82
ac73cedf 83static void git_hash_sha1_final(unsigned char *hash, git_hash_ctx *ctx)
f50e766b 84{
ac73cedf 85 git_SHA1_Final(hash, &ctx->sha1);
f50e766b 86}
87
13eeedb5 88
89static void git_hash_sha256_init(git_hash_ctx *ctx)
90{
91 git_SHA256_Init(&ctx->sha256);
92}
93
94static void git_hash_sha256_update(git_hash_ctx *ctx, const void *data, size_t len)
95{
96 git_SHA256_Update(&ctx->sha256, data, len);
97}
98
99static void git_hash_sha256_final(unsigned char *hash, git_hash_ctx *ctx)
100{
101 git_SHA256_Final(hash, &ctx->sha256);
102}
103
ac73cedf 104static void git_hash_unknown_init(git_hash_ctx *ctx)
f50e766b 105{
1a07e59c 106 BUG("trying to init unknown hash");
f50e766b 107}
108
ac73cedf 109static void git_hash_unknown_update(git_hash_ctx *ctx, const void *data, size_t len)
f50e766b 110{
1a07e59c 111 BUG("trying to update unknown hash");
f50e766b 112}
113
ac73cedf 114static void git_hash_unknown_final(unsigned char *hash, git_hash_ctx *ctx)
f50e766b 115{
1a07e59c 116 BUG("trying to finalize unknown hash");
f50e766b 117}
118
119const struct git_hash_algo hash_algos[GIT_HASH_NALGOS] = {
120 {
121 NULL,
122 0x00000000,
123 0,
124 0,
a2ce0a75 125 0,
f50e766b 126 git_hash_unknown_init,
127 git_hash_unknown_update,
128 git_hash_unknown_final,
129 NULL,
130 NULL,
131 },
132 {
1ccf07cb 133 "sha1",
f50e766b 134 /* "sha1", big-endian */
135 0x73686131,
f50e766b 136 GIT_SHA1_RAWSZ,
137 GIT_SHA1_HEXSZ,
a2ce0a75 138 GIT_SHA1_BLKSZ,
f50e766b 139 git_hash_sha1_init,
140 git_hash_sha1_update,
141 git_hash_sha1_final,
142 &empty_tree_oid,
143 &empty_blob_oid,
144 },
13eeedb5 145 {
146 "sha256",
147 /* "s256", big-endian */
148 0x73323536,
149 GIT_SHA256_RAWSZ,
150 GIT_SHA256_HEXSZ,
151 GIT_SHA256_BLKSZ,
152 git_hash_sha256_init,
153 git_hash_sha256_update,
154 git_hash_sha256_final,
155 &empty_tree_oid_sha256,
156 &empty_blob_oid_sha256,
157 }
f50e766b 158};
159
d8a92ced 160const char *empty_tree_oid_hex(void)
161{
162 static char buf[GIT_MAX_HEXSZ + 1];
163 return oid_to_hex_r(buf, the_hash_algo->empty_tree);
164}
165
166const char *empty_blob_oid_hex(void)
167{
168 static char buf[GIT_MAX_HEXSZ + 1];
169 return oid_to_hex_r(buf, the_hash_algo->empty_blob);
170}
171
2f90b9d9 172int hash_algo_by_name(const char *name)
173{
174 int i;
175 if (!name)
176 return GIT_HASH_UNKNOWN;
177 for (i = 1; i < GIT_HASH_NALGOS; i++)
178 if (!strcmp(name, hash_algos[i].name))
179 return i;
180 return GIT_HASH_UNKNOWN;
181}
182
183int hash_algo_by_id(uint32_t format_id)
184{
185 int i;
186 for (i = 1; i < GIT_HASH_NALGOS; i++)
187 if (format_id == hash_algos[i].format_id)
188 return i;
189 return GIT_HASH_UNKNOWN;
190}
191
95399788 192int hash_algo_by_length(int len)
193{
194 int i;
195 for (i = 1; i < GIT_HASH_NALGOS; i++)
196 if (len == hash_algos[i].rawsz)
197 return i;
198 return GIT_HASH_UNKNOWN;
199}
2f90b9d9 200
c597ba80
NTND
201/*
202 * This is meant to hold a *small* number of objects that you would
cb1c8d1d 203 * want read_object_file() to be able to return, but yet you do not want
c597ba80
NTND
204 * to write them into the object store (e.g. a browse-only
205 * application).
206 */
207static struct cached_object {
62ba93ea 208 struct object_id oid;
c597ba80
NTND
209 enum object_type type;
210 void *buf;
211 unsigned long size;
212} *cached_objects;
213static int cached_object_nr, cached_object_alloc;
214
215static struct cached_object empty_tree = {
62ba93ea 216 { EMPTY_TREE_SHA1_BIN_LITERAL },
c597ba80
NTND
217 OBJ_TREE,
218 "",
219 0
220};
221
62ba93ea 222static struct cached_object *find_cached_object(const struct object_id *oid)
c597ba80
NTND
223{
224 int i;
225 struct cached_object *co = cached_objects;
226
227 for (i = 0; i < cached_object_nr; i++, co++) {
4a7e27e9 228 if (oideq(&co->oid, oid))
c597ba80
NTND
229 return co;
230 }
4a7e27e9 231 if (oideq(oid, the_hash_algo->empty_tree))
c597ba80
NTND
232 return &empty_tree;
233 return NULL;
234}
235
9472935d 236
8462ff43 237static int get_conv_flags(unsigned flags)
9472935d
TB
238{
239 if (flags & HASH_RENORMALIZE)
8462ff43 240 return CONV_EOL_RENORMALIZE;
9472935d 241 else if (flags & HASH_WRITE_OBJECT)
107642fe 242 return global_conv_flags_eol | CONV_WRITE_OBJECT;
9472935d 243 else
8462ff43 244 return 0;
9472935d
TB
245}
246
247
90a6464b
JH
248int mkdir_in_gitdir(const char *path)
249{
250 if (mkdir(path, 0777)) {
251 int saved_errno = errno;
252 struct stat st;
253 struct strbuf sb = STRBUF_INIT;
254
255 if (errno != EEXIST)
256 return -1;
257 /*
258 * Are we looking at a path in a symlinked worktree
259 * whose original repository does not yet have it?
260 * e.g. .git/rr-cache pointing at its original
261 * repository in which the user hasn't performed any
262 * conflict resolution yet?
263 */
264 if (lstat(path, &st) || !S_ISLNK(st.st_mode) ||
265 strbuf_readlink(&sb, path, st.st_size) ||
266 !is_absolute_path(sb.buf) ||
267 mkdir(sb.buf, 0777)) {
268 strbuf_release(&sb);
269 errno = saved_errno;
270 return -1;
271 }
272 strbuf_release(&sb);
273 }
274 return adjust_shared_perm(path);
275}
276
0be0521b 277enum scld_error safe_create_leading_directories(char *path)
b2cb9425 278{
26c8ae2a 279 char *next_component = path + offset_1st_component(path);
0be0521b 280 enum scld_error ret = SCLD_OK;
67d42212 281
0be0521b 282 while (ret == SCLD_OK && next_component) {
f0502332 283 struct stat st;
0f527403 284 char *slash = next_component, slash_character;
f0502332 285
0f527403
MH
286 while (*slash && !is_dir_sep(*slash))
287 slash++;
288
289 if (!*slash)
b2cb9425 290 break;
bf10cf70 291
26c8ae2a 292 next_component = slash + 1;
0f527403 293 while (is_dir_sep(*next_component))
bf10cf70 294 next_component++;
26c8ae2a 295 if (!*next_component)
5f0bdf50 296 break;
831651fd 297
0f527403 298 slash_character = *slash;
831651fd 299 *slash = '\0';
67d42212
JR
300 if (!stat(path, &st)) {
301 /* path exists */
204a047f
MH
302 if (!S_ISDIR(st.st_mode)) {
303 errno = ENOTDIR;
0be0521b 304 ret = SCLD_EXISTS;
204a047f 305 }
53a39721 306 } else if (mkdir(path, 0777)) {
928734d9 307 if (errno == EEXIST &&
9e6f885d 308 !stat(path, &st) && S_ISDIR(st.st_mode))
928734d9 309 ; /* somebody created it since we checked */
18d37e86
MH
310 else if (errno == ENOENT)
311 /*
312 * Either mkdir() failed because
313 * somebody just pruned the containing
314 * directory, or stat() failed because
315 * the file that was in our way was
316 * just removed. Either way, inform
317 * the caller that it might be worth
318 * trying again:
319 */
320 ret = SCLD_VANISHED;
9e6f885d 321 else
0be0521b 322 ret = SCLD_FAILED;
53a39721 323 } else if (adjust_shared_perm(path)) {
0be0521b 324 ret = SCLD_PERMS;
457f06d6 325 }
0f527403 326 *slash = slash_character;
b2cb9425 327 }
9e6f885d 328 return ret;
b2cb9425 329}
723c31fe 330
0be0521b 331enum scld_error safe_create_leading_directories_const(const char *path)
8e21d63b 332{
02944307 333 int save_errno;
8e21d63b
JK
334 /* path points to cache entries, so xstrdup before messing with it */
335 char *buf = xstrdup(path);
0be0521b 336 enum scld_error result = safe_create_leading_directories(buf);
02944307
MH
337
338 save_errno = errno;
8e21d63b 339 free(buf);
02944307 340 errno = save_errno;
8e21d63b
JK
341 return result;
342}
343
177978f5
MH
344int raceproof_create_file(const char *path, create_file_fn fn, void *cb)
345{
346 /*
347 * The number of times we will try to remove empty directories
348 * in the way of path. This is only 1 because if another
349 * process is racily creating directories that conflict with
350 * us, we don't want to fight against them.
351 */
352 int remove_directories_remaining = 1;
353
354 /*
355 * The number of times that we will try to create the
356 * directories containing path. We are willing to attempt this
357 * more than once, because another process could be trying to
358 * clean up empty directories at the same time as we are
359 * trying to create them.
360 */
361 int create_directories_remaining = 3;
362
363 /* A scratch copy of path, filled lazily if we need it: */
364 struct strbuf path_copy = STRBUF_INIT;
365
366 int ret, save_errno;
367
368 /* Sanity check: */
369 assert(*path);
370
371retry_fn:
372 ret = fn(path, cb);
373 save_errno = errno;
374 if (!ret)
375 goto out;
376
377 if (errno == EISDIR && remove_directories_remaining-- > 0) {
378 /*
379 * A directory is in the way. Maybe it is empty; try
380 * to remove it:
381 */
382 if (!path_copy.len)
383 strbuf_addstr(&path_copy, path);
384
385 if (!remove_dir_recursively(&path_copy, REMOVE_DIR_EMPTY_ONLY))
386 goto retry_fn;
387 } else if (errno == ENOENT && create_directories_remaining-- > 0) {
388 /*
389 * Maybe the containing directory didn't exist, or
390 * maybe it was just deleted by a process that is
391 * racing with us to clean up empty directories. Try
392 * to create it:
393 */
394 enum scld_error scld_result;
395
396 if (!path_copy.len)
397 strbuf_addstr(&path_copy, path);
398
399 do {
400 scld_result = safe_create_leading_directories(path_copy.buf);
401 if (scld_result == SCLD_OK)
402 goto retry_fn;
403 } while (scld_result == SCLD_VANISHED && create_directories_remaining-- > 0);
404 }
405
406out:
407 strbuf_release(&path_copy);
408 errno = save_errno;
409 return ret;
410}
411
514c5fdd 412static void fill_loose_path(struct strbuf *buf, const struct object_id *oid)
ace1534d
JH
413{
414 int i;
94b5e093 415 for (i = 0; i < the_hash_algo->rawsz; i++) {
ace1534d 416 static char hex[] = "0123456789abcdef";
514c5fdd 417 unsigned int val = oid->hash[i];
f7b7774f
JK
418 strbuf_addch(buf, hex[val >> 4]);
419 strbuf_addch(buf, hex[val & 0xf]);
afbba2f0 420 if (!i)
f7b7774f 421 strbuf_addch(buf, '/');
ace1534d
JH
422 }
423}
424
f0eaf638
JK
425static const char *odb_loose_path(struct object_directory *odb,
426 struct strbuf *buf,
514c5fdd 427 const struct object_id *oid)
0fcfd160 428{
b69fb867 429 strbuf_reset(buf);
f0eaf638 430 strbuf_addstr(buf, odb->path);
34498471 431 strbuf_addch(buf, '/');
514c5fdd 432 fill_loose_path(buf, oid);
f3f043a1 433 return buf->buf;
0fcfd160
LT
434}
435
f3f043a1 436const char *loose_object_path(struct repository *r, struct strbuf *buf,
514c5fdd 437 const struct object_id *oid)
29ec6af2 438{
514c5fdd 439 return odb_loose_path(r->objects->odb, buf, oid);
0fcfd160
LT
440}
441
4ea82473
JK
442/*
443 * Return non-zero iff the path is usable as an alternate object database.
444 */
13313fc3
SB
445static int alt_odb_usable(struct raw_object_store *o,
446 struct strbuf *path,
447 const char *normalized_objdir)
4ea82473 448{
263db403 449 struct object_directory *odb;
4ea82473
JK
450
451 /* Detect cases where alternate disappeared */
452 if (!is_directory(path->buf)) {
259328b7
NTND
453 error(_("object directory %s does not exist; "
454 "check .git/objects/info/alternates"),
4ea82473
JK
455 path->buf);
456 return 0;
457 }
458
459 /*
460 * Prevent the common mistake of listing the same
461 * thing twice, or object directory itself.
462 */
f0eaf638 463 for (odb = o->odb; odb; odb = odb->next) {
263db403 464 if (!fspathcmp(path->buf, odb->path))
4ea82473
JK
465 return 0;
466 }
467 if (!fspathcmp(path->buf, normalized_objdir))
468 return 0;
469
470 return 1;
471}
472
ddd5d056
JH
473/*
474 * Prepare alternate object database registry.
d5a63b99
JH
475 *
476 * The variable alt_odb_list points at the list of struct
263db403 477 * object_directory. The elements on this list come from
d5a63b99
JH
478 * non-empty elements from colon separated ALTERNATE_DB_ENVIRONMENT
479 * environment variable, and $GIT_OBJECT_DIRECTORY/info/alternates,
1494e038
JH
480 * whose contents is similar to that environment variable but can be
481 * LF separated. Its base points at a statically allocated buffer that
d5a63b99
JH
482 * contains "/the/directory/corresponding/to/.git/objects/...", while
483 * its name points just after the slash at the end of ".git/objects/"
484 * in the example above, and has enough space to hold 40-byte hex
485 * SHA1, an extra slash for the first level indirection, and the
486 * terminating NUL.
ddd5d056 487 */
77f012e8
SB
488static void read_info_alternates(struct repository *r,
489 const char *relative_base,
490 int depth);
491static int link_alt_odb_entry(struct repository *r, const char *entry,
cfc62fc9 492 const char *relative_base, int depth, const char *normalized_objdir)
ace1534d 493{
263db403 494 struct object_directory *ent;
5bdf0a84 495 struct strbuf pathbuf = STRBUF_INIT;
d5a63b99 496
85dadc38 497 if (!is_absolute_path(entry) && relative_base) {
4ac9006f 498 strbuf_realpath(&pathbuf, relative_base, 1);
5bdf0a84 499 strbuf_addch(&pathbuf, '/');
c2f493a4 500 }
6eac50d8 501 strbuf_addstr(&pathbuf, entry);
c2f493a4 502
37a95862 503 if (strbuf_normalize_path(&pathbuf) < 0 && relative_base) {
259328b7 504 error(_("unable to normalize alternate object path: %s"),
670c359d
JK
505 pathbuf.buf);
506 strbuf_release(&pathbuf);
507 return -1;
508 }
5bdf0a84
HW
509
510 /*
511 * The trailing slash after the directory name is given by
512 * this function at the end. Remove duplicates.
513 */
4ea82473
JK
514 while (pathbuf.len && pathbuf.buf[pathbuf.len - 1] == '/')
515 strbuf_setlen(&pathbuf, pathbuf.len - 1);
5bdf0a84 516
77f012e8 517 if (!alt_odb_usable(r->objects, &pathbuf, normalized_objdir)) {
4ea82473 518 strbuf_release(&pathbuf);
c2f493a4
MW
519 return -1;
520 }
521
f0eaf638
JK
522 ent = xcalloc(1, sizeof(*ent));
523 ent->path = xstrdup(pathbuf.buf);
c2f493a4
MW
524
525 /* add the alternate entry */
f0eaf638
JK
526 *r->objects->odb_tail = ent;
527 r->objects->odb_tail = &(ent->next);
c2f493a4
MW
528 ent->next = NULL;
529
530 /* recursively add alternates */
77f012e8 531 read_info_alternates(r, pathbuf.buf, depth + 1);
c2f493a4 532
4ea82473 533 strbuf_release(&pathbuf);
c2f493a4
MW
534 return 0;
535}
536
cf3c6352
JK
537static const char *parse_alt_odb_entry(const char *string,
538 int sep,
539 struct strbuf *out)
540{
541 const char *end;
542
543 strbuf_reset(out);
544
545 if (*string == '#') {
546 /* comment; consume up to next separator */
547 end = strchrnul(string, sep);
548 } else if (*string == '"' && !unquote_c_style(out, string, &end)) {
549 /*
550 * quoted path; unquote_c_style has copied the
551 * data for us and set "end". Broken quoting (e.g.,
552 * an entry that doesn't end with a quote) falls
553 * back to the unquoted case below.
554 */
555 } else {
556 /* normal, unquoted path */
557 end = strchrnul(string, sep);
558 strbuf_add(out, string, end - string);
559 }
560
561 if (*end)
562 end++;
563 return end;
564}
565
77f012e8
SB
566static void link_alt_odb_entries(struct repository *r, const char *alt,
567 int sep, const char *relative_base, int depth)
c2f493a4 568{
539e7506 569 struct strbuf objdirbuf = STRBUF_INIT;
cf3c6352 570 struct strbuf entry = STRBUF_INIT;
c2f493a4 571
f28e3668
JK
572 if (!alt || !*alt)
573 return;
574
c2f493a4 575 if (depth > 5) {
259328b7 576 error(_("%s: ignoring alternate object stores, nesting too deep"),
c2f493a4
MW
577 relative_base);
578 return;
579 }
580
f0eaf638 581 strbuf_add_absolute_path(&objdirbuf, r->objects->odb->path);
670c359d 582 if (strbuf_normalize_path(&objdirbuf) < 0)
259328b7 583 die(_("unable to normalize object directory: %s"),
670c359d 584 objdirbuf.buf);
539e7506 585
cf3c6352
JK
586 while (*alt) {
587 alt = parse_alt_odb_entry(alt, sep, &entry);
588 if (!entry.len)
9577e7e3 589 continue;
77f012e8 590 link_alt_odb_entry(r, entry.buf,
cfc62fc9 591 relative_base, depth, objdirbuf.buf);
9577e7e3 592 }
cf3c6352 593 strbuf_release(&entry);
539e7506 594 strbuf_release(&objdirbuf);
d5a63b99
JH
595}
596
77f012e8
SB
597static void read_info_alternates(struct repository *r,
598 const char *relative_base,
599 int depth)
d5a63b99 600{
5015f01c 601 char *path;
dc732bd5 602 struct strbuf buf = STRBUF_INIT;
d5a63b99 603
5015f01c 604 path = xstrfmt("%s/info/alternates", relative_base);
dc732bd5 605 if (strbuf_read_file(&buf, path, 1024) < 0) {
f0f7bebe 606 warn_on_fopen_errors(path);
dc732bd5 607 free(path);
9a217f2a 608 return;
ace1534d 609 }
d5a63b99 610
77f012e8 611 link_alt_odb_entries(r, buf.buf, '\n', relative_base, depth);
dc732bd5
JK
612 strbuf_release(&buf);
613 free(path);
ace1534d
JH
614}
615
bef70b22
DB
616void add_to_alternates_file(const char *reference)
617{
f132a127 618 struct lock_file lock = LOCK_INIT;
77b9b1d1
JK
619 char *alts = git_pathdup("objects/info/alternates");
620 FILE *in, *out;
f132a127 621 int found = 0;
77b9b1d1 622
f132a127
623 hold_lock_file_for_update(&lock, alts, LOCK_DIE_ON_ERROR);
624 out = fdopen_lock_file(&lock, "w");
77b9b1d1 625 if (!out)
259328b7 626 die_errno(_("unable to fdopen alternates lockfile"));
77b9b1d1
JK
627
628 in = fopen(alts, "r");
629 if (in) {
630 struct strbuf line = STRBUF_INIT;
77b9b1d1 631
3f163962 632 while (strbuf_getline(&line, in) != EOF) {
77b9b1d1
JK
633 if (!strcmp(reference, line.buf)) {
634 found = 1;
635 break;
636 }
637 fprintf_or_die(out, "%s\n", line.buf);
638 }
639
640 strbuf_release(&line);
641 fclose(in);
77b9b1d1
JK
642 }
643 else if (errno != ENOENT)
259328b7 644 die_errno(_("unable to read alternates file"));
77b9b1d1 645
f132a127
646 if (found) {
647 rollback_lock_file(&lock);
648 } else {
77b9b1d1 649 fprintf_or_die(out, "%s\n", reference);
f132a127 650 if (commit_lock_file(&lock))
259328b7 651 die_errno(_("unable to move new alternates file into place"));
f0eaf638 652 if (the_repository->objects->loaded_alternates)
93d8d1e2
SB
653 link_alt_odb_entries(the_repository, reference,
654 '\n', NULL, 0);
77b9b1d1
JK
655 }
656 free(alts);
bef70b22
DB
657}
658
a5b34d21
JK
659void add_to_alternates_memory(const char *reference)
660{
661 /*
662 * Make sure alternates are initialized, or else our entry may be
663 * overwritten when they are.
664 */
0b209034 665 prepare_alt_odb(the_repository);
a5b34d21 666
93d8d1e2
SB
667 link_alt_odb_entries(the_repository, reference,
668 '\n', NULL, 0);
a5b34d21
JK
669}
670
9eeea7d2
SB
671/*
672 * Compute the exact path an alternate is at and returns it. In case of
673 * error NULL is returned and the human readable error is added to `err`
efde7b72 674 * `path` may be relative and should point to $GIT_DIR.
9eeea7d2
SB
675 * `err` must not be null.
676 */
677char *compute_alternate_path(const char *path, struct strbuf *err)
678{
679 char *ref_git = NULL;
680 const char *repo, *ref_git_s;
681 int seen_error = 0;
682
683 ref_git_s = real_path_if_valid(path);
684 if (!ref_git_s) {
685 seen_error = 1;
686 strbuf_addf(err, _("path '%s' does not exist"), path);
687 goto out;
688 } else
689 /*
690 * Beware: read_gitfile(), real_path() and mkpath()
691 * return static buffer
692 */
693 ref_git = xstrdup(ref_git_s);
694
695 repo = read_gitfile(ref_git);
696 if (!repo)
697 repo = read_gitfile(mkpath("%s/.git", ref_git));
698 if (repo) {
699 free(ref_git);
700 ref_git = xstrdup(repo);
701 }
702
703 if (!repo && is_directory(mkpath("%s/.git/objects", ref_git))) {
704 char *ref_git_git = mkpathdup("%s/.git", ref_git);
705 free(ref_git);
706 ref_git = ref_git_git;
707 } else if (!is_directory(mkpath("%s/objects", ref_git))) {
708 struct strbuf sb = STRBUF_INIT;
709 seen_error = 1;
710 if (get_common_dir(&sb, ref_git)) {
711 strbuf_addf(err,
712 _("reference repository '%s' as a linked "
713 "checkout is not supported yet."),
714 path);
715 goto out;
716 }
717
718 strbuf_addf(err, _("reference repository '%s' is not a "
719 "local repository."), path);
720 goto out;
721 }
722
723 if (!access(mkpath("%s/shallow", ref_git), F_OK)) {
724 strbuf_addf(err, _("reference repository '%s' is shallow"),
725 path);
726 seen_error = 1;
727 goto out;
728 }
729
730 if (!access(mkpath("%s/info/grafts", ref_git), F_OK)) {
731 strbuf_addf(err,
732 _("reference repository '%s' is grafted"),
733 path);
734 seen_error = 1;
735 goto out;
736 }
737
738out:
739 if (seen_error) {
6a83d902 740 FREE_AND_NULL(ref_git);
9eeea7d2
SB
741 }
742
743 return ref_git;
744}
745
fe1b2268 746int foreach_alt_odb(alt_odb_fn fn, void *cb)
d79796bc 747{
263db403 748 struct object_directory *ent;
fe1b2268 749 int r = 0;
d79796bc 750
0b209034 751 prepare_alt_odb(the_repository);
f0eaf638 752 for (ent = the_repository->objects->odb->next; ent; ent = ent->next) {
fe1b2268
JK
753 r = fn(ent, cb);
754 if (r)
755 break;
756 }
757 return r;
d79796bc
JH
758}
759
13068bf0 760void prepare_alt_odb(struct repository *r)
c2f493a4 761{
f0eaf638 762 if (r->objects->loaded_alternates)
7dc24aa5
SP
763 return;
764
13068bf0 765 link_alt_odb_entries(r, r->objects->alternate_db, PATH_SEP, NULL, 0);
c2f493a4 766
f0eaf638
JK
767 read_info_alternates(r, r->objects->odb->path, 0);
768 r->objects->loaded_alternates = 1;
c2f493a4
MW
769}
770
3096b2ec 771/* Returns 1 if we have successfully freshened the file, 0 otherwise. */
33d4221c 772static int freshen_file(const char *fn)
ace1534d 773{
33d4221c
JK
774 struct utimbuf t;
775 t.actime = t.modtime = time(NULL);
776 return !utime(fn, &t);
0f4dc14a 777}
ace1534d 778
3096b2ec
JK
779/*
780 * All of the check_and_freshen functions return 1 if the file exists and was
781 * freshened (if freshening was requested), 0 otherwise. If they return
782 * 0, you should not assume that it is safe to skip a write of the object (it
783 * either does not exist on disk, or has a stale mtime and may be subject to
784 * pruning).
785 */
6a5e6f5e 786int check_and_freshen_file(const char *fn, int freshen)
33d4221c
JK
787{
788 if (access(fn, F_OK))
789 return 0;
3096b2ec 790 if (freshen && !freshen_file(fn))
33d4221c
JK
791 return 0;
792 return 1;
793}
794
f0eaf638
JK
795static int check_and_freshen_odb(struct object_directory *odb,
796 const struct object_id *oid,
797 int freshen)
33d4221c 798{
f0eaf638 799 static struct strbuf path = STRBUF_INIT;
514c5fdd 800 odb_loose_path(odb, &path, oid);
f0eaf638
JK
801 return check_and_freshen_file(path.buf, freshen);
802}
ea657730 803
f0eaf638
JK
804static int check_and_freshen_local(const struct object_id *oid, int freshen)
805{
806 return check_and_freshen_odb(the_repository->objects->odb, oid, freshen);
33d4221c
JK
807}
808
6862ebbf 809static int check_and_freshen_nonlocal(const struct object_id *oid, int freshen)
0f4dc14a 810{
263db403 811 struct object_directory *odb;
f3f043a1 812
0b209034 813 prepare_alt_odb(the_repository);
f0eaf638
JK
814 for (odb = the_repository->objects->odb->next; odb; odb = odb->next) {
815 if (check_and_freshen_odb(odb, oid, freshen))
c529d75a 816 return 1;
ace1534d 817 }
c529d75a 818 return 0;
ace1534d
JH
819}
820
6862ebbf 821static int check_and_freshen(const struct object_id *oid, int freshen)
33d4221c 822{
6862ebbf 823 return check_and_freshen_local(oid, freshen) ||
824 check_and_freshen_nonlocal(oid, freshen);
33d4221c
JK
825}
826
6862ebbf 827int has_loose_object_nonlocal(const struct object_id *oid)
33d4221c 828{
6862ebbf 829 return check_and_freshen_nonlocal(oid, 0);
33d4221c
JK
830}
831
6862ebbf 832static int has_loose_object(const struct object_id *oid)
0f4dc14a 833{
6862ebbf 834 return check_and_freshen(oid, 0);
0f4dc14a
BC
835}
836
02710228
SP
837static void mmap_limit_check(size_t length)
838{
839 static size_t limit = 0;
840 if (!limit) {
841 limit = git_env_ulong("GIT_MMAP_LIMIT", 0);
842 if (!limit)
843 limit = SIZE_MAX;
844 }
845 if (length > limit)
259328b7 846 die(_("attempting to mmap %"PRIuMAX" over limit %"PRIuMAX),
02710228
SP
847 (uintmax_t)length, (uintmax_t)limit);
848}
849
1570856b
JK
850void *xmmap_gently(void *start, size_t length,
851 int prot, int flags, int fd, off_t offset)
58ecbd5e 852{
02710228
SP
853 void *ret;
854
855 mmap_limit_check(length);
856 ret = mmap(start, length, prot, flags, fd, offset);
58ecbd5e
JN
857 if (ret == MAP_FAILED) {
858 if (!length)
859 return NULL;
7c3ecb32 860 release_pack_memory(length);
58ecbd5e 861 ret = mmap(start, length, prot, flags, fd, offset);
58ecbd5e
JN
862 }
863 return ret;
864}
865
1570856b
JK
866void *xmmap(void *start, size_t length,
867 int prot, int flags, int fd, off_t offset)
868{
869 void *ret = xmmap_gently(start, length, prot, flags, fd, offset);
870 if (ret == MAP_FAILED)
259328b7 871 die_errno(_("mmap failed"));
1570856b
JK
872 return ret;
873}
874
88d0db55 875/*
090ea126 876 * With an in-core object data in "map", rehash it to make sure the
cb1c8d1d
JK
877 * object name actually matches "oid" to detect object corruption.
878 * With "map" == NULL, try reading the object named with "oid" using
090ea126 879 * the streaming interface and rehash it to do the same.
88d0db55 880 */
17e65451 881int check_object_signature(const struct object_id *oid, void *map,
882 unsigned long size, const char *type)
88d0db55 883{
f070facc 884 struct object_id real_oid;
090ea126
NTND
885 enum object_type obj_type;
886 struct git_istream *st;
18e2588e 887 git_hash_ctx c;
1af64f73 888 char hdr[MAX_HEADER_LEN];
090ea126 889 int hdrlen;
88d0db55 890
090ea126 891 if (map) {
f070facc 892 hash_object_file(map, size, type, &real_oid);
9001dc2a 893 return !oideq(oid, &real_oid) ? -1 : 0;
88d0db55
BC
894 }
895
ef7b5195 896 st = open_istream(oid, &obj_type, &size, NULL);
090ea126
NTND
897 if (!st)
898 return -1;
88d0db55 899
090ea126 900 /* Generate the header */
ca473cef 901 hdrlen = xsnprintf(hdr, sizeof(hdr), "%s %"PRIuMAX , type_name(obj_type), (uintmax_t)size) + 1;
88d0db55 902
090ea126 903 /* Sha1.. */
18e2588e 904 the_hash_algo->init_fn(&c);
905 the_hash_algo->update_fn(&c, hdr, hdrlen);
090ea126
NTND
906 for (;;) {
907 char buf[1024 * 16];
908 ssize_t readlen = read_istream(st, buf, sizeof(buf));
1f688557 909
f54fac53
JK
910 if (readlen < 0) {
911 close_istream(st);
912 return -1;
913 }
090ea126
NTND
914 if (!readlen)
915 break;
18e2588e 916 the_hash_algo->update_fn(&c, buf, readlen);
fa5fc15d 917 }
18e2588e 918 the_hash_algo->final_fn(real_oid.hash, &c);
090ea126 919 close_istream(st);
9001dc2a 920 return !oideq(oid, &real_oid) ? -1 : 0;
fa5fc15d
SP
921}
922
1b8ac5ea 923int git_open_cloexec(const char *name, int flags)
a0788266 924{
1e3001a8
JH
925 int fd;
926 static int o_cloexec = O_CLOEXEC;
a0788266 927
1e3001a8
JH
928 fd = open(name, flags | o_cloexec);
929 if ((o_cloexec & O_CLOEXEC) && fd < 0 && errno == EINVAL) {
cd66ada0 930 /* Try again w/o O_CLOEXEC: the kernel might not support it */
1e3001a8
JH
931 o_cloexec &= ~O_CLOEXEC;
932 fd = open(name, flags | o_cloexec);
491a8dec 933 }
491a8dec 934
9fb9495d 935#if defined(F_GETFD) && defined(F_SETFD) && defined(FD_CLOEXEC)
491a8dec 936 {
1e3001a8 937 static int fd_cloexec = FD_CLOEXEC;
a0788266 938
1e3001a8
JH
939 if (!o_cloexec && 0 <= fd && fd_cloexec) {
940 /* Opened w/o O_CLOEXEC? try with fcntl(2) to add it */
9fb9495d
EW
941 int flags = fcntl(fd, F_GETFD);
942 if (fcntl(fd, F_SETFD, flags | fd_cloexec))
1e3001a8 943 fd_cloexec = 0;
cd66ada0 944 }
44d1c19e 945 }
a0788266 946#endif
1b8ac5ea 947 return fd;
a0788266
JS
948}
949
3cf8b462 950/*
514c5fdd 951 * Find "oid" as a loose object in the local repository or in an alternate.
771e7d57
JK
952 * Returns 0 on success, negative on failure.
953 *
954 * The "path" out-parameter will give the path of the object we found (if any).
955 * Note that it may point to static storage and is only valid until another
514c5fdd 956 * call to stat_loose_object().
3cf8b462 957 */
514c5fdd
JK
958static int stat_loose_object(struct repository *r, const struct object_id *oid,
959 struct stat *st, const char **path)
1f688557 960{
263db403 961 struct object_directory *odb;
ea657730
CC
962 static struct strbuf buf = STRBUF_INIT;
963
d2607fa0 964 prepare_alt_odb(r);
f0eaf638 965 for (odb = r->objects->odb; odb; odb = odb->next) {
514c5fdd 966 *path = odb_loose_path(odb, &buf, oid);
771e7d57 967 if (!lstat(*path, st))
052fe5ea 968 return 0;
c7934306
SP
969 }
970
3cf8b462
SP
971 return -1;
972}
973
771e7d57 974/*
514c5fdd 975 * Like stat_loose_object(), but actually open the object and return the
771e7d57
JK
976 * descriptor. See the caveats on the "path" parameter above.
977 */
514c5fdd
JK
978static int open_loose_object(struct repository *r,
979 const struct object_id *oid, const char **path)
60bb8b14 980{
44d1c19e 981 int fd;
263db403 982 struct object_directory *odb;
f0eaf638 983 int most_interesting_errno = ENOENT;
ea657730
CC
984 static struct strbuf buf = STRBUF_INIT;
985
ec7283e5 986 prepare_alt_odb(r);
f0eaf638 987 for (odb = r->objects->odb; odb; odb = odb->next) {
514c5fdd 988 *path = odb_loose_path(odb, &buf, oid);
771e7d57 989 fd = git_open(*path);
44d1c19e
LT
990 if (fd >= 0)
991 return fd;
f0eaf638 992
d6c8a05b
JK
993 if (most_interesting_errno == ENOENT)
994 most_interesting_errno = errno;
03e79c88 995 }
d6c8a05b 996 errno = most_interesting_errno;
44d1c19e 997 return -1;
1f688557
JH
998}
999
61c7711c 1000static int quick_has_loose(struct repository *r,
d7a24573 1001 const struct object_id *oid)
61c7711c 1002{
61c7711c
JK
1003 struct object_directory *odb;
1004
61c7711c
JK
1005 prepare_alt_odb(r);
1006 for (odb = r->objects->odb; odb; odb = odb->next) {
d7a24573 1007 if (oid_array_lookup(odb_loose_cache(odb, oid), oid) >= 0)
61c7711c
JK
1008 return 1;
1009 }
1010 return 0;
1011}
1012
f6371f92
JK
1013/*
1014 * Map the loose object at "path" if it is not NULL, or the path found by
514c5fdd 1015 * searching for a loose object named "oid".
f6371f92 1016 */
514c5fdd
JK
1017static void *map_loose_object_1(struct repository *r, const char *path,
1018 const struct object_id *oid, unsigned long *size)
27d69a46 1019{
0fcfd160 1020 void *map;
144bde78 1021 int fd;
84dd81c1 1022
f6371f92
JK
1023 if (path)
1024 fd = git_open(path);
8261e1f1 1025 else
514c5fdd 1026 fd = open_loose_object(r, oid, &path);
44d1c19e
LT
1027 map = NULL;
1028 if (fd >= 0) {
1029 struct stat st;
1f688557 1030
44d1c19e
LT
1031 if (!fstat(fd, &st)) {
1032 *size = xsize_t(st.st_size);
33e42de0
MM
1033 if (!*size) {
1034 /* mmap() is forbidden on empty files */
259328b7 1035 error(_("object file %s is empty"), path);
6881925e 1036 close(fd);
33e42de0
MM
1037 return NULL;
1038 }
44d1c19e 1039 map = xmmap(NULL, *size, PROT_READ, MAP_PRIVATE, fd, 0);
144bde78 1040 }
44d1c19e 1041 close(fd);
74e34e1f 1042 }
0fcfd160 1043 return map;
74e34e1f
NP
1044}
1045
514c5fdd
JK
1046void *map_loose_object(struct repository *r,
1047 const struct object_id *oid,
1048 unsigned long *size)
068f85e3 1049{
514c5fdd 1050 return map_loose_object_1(r, NULL, oid, size);
068f85e3 1051}
1052
00a7760e
JK
1053static int unpack_loose_short_header(git_zstream *stream,
1054 unsigned char *map, unsigned long mapsize,
1055 void *buffer, unsigned long bufsiz)
47fe3f6e 1056{
c4483576
LT
1057 /* Get the data stream */
1058 memset(stream, 0, sizeof(*stream));
1059 stream->next_in = map;
1060 stream->avail_in = mapsize;
1061 stream->next_out = buffer;
93821bd9 1062 stream->avail_out = bufsiz;
47fe3f6e 1063
39c68542 1064 git_inflate_init(stream);
cc5c54e7 1065 return git_inflate(stream, 0);
9a217f2a
JH
1066}
1067
00a7760e
JK
1068int unpack_loose_header(git_zstream *stream,
1069 unsigned char *map, unsigned long mapsize,
1070 void *buffer, unsigned long bufsiz)
1f688557 1071{
00a7760e
JK
1072 int status = unpack_loose_short_header(stream, map, mapsize,
1073 buffer, bufsiz);
42873078 1074
d21f8426
JH
1075 if (status < Z_OK)
1076 return status;
628522ec 1077
d21f8426
JH
1078 /* Make sure we have the terminating NUL */
1079 if (!memchr(buffer, '\0', stream->next_out - (unsigned char *)buffer))
1080 return -1;
1f688557
JH
1081 return 0;
1082}
1083
00a7760e
JK
1084static int unpack_loose_header_to_strbuf(git_zstream *stream, unsigned char *map,
1085 unsigned long mapsize, void *buffer,
1086 unsigned long bufsiz, struct strbuf *header)
d131b7af 1087{
46f03448
KN
1088 int status;
1089
00a7760e 1090 status = unpack_loose_short_header(stream, map, mapsize, buffer, bufsiz);
d21f8426
JH
1091 if (status < Z_OK)
1092 return -1;
d131b7af 1093
46f03448
KN
1094 /*
1095 * Check if entire header is unpacked in the first iteration.
d131b7af 1096 */
46f03448
KN
1097 if (memchr(buffer, '\0', stream->next_out - (unsigned char *)buffer))
1098 return 0;
d131b7af 1099
46f03448
KN
1100 /*
1101 * buffer[0..bufsiz] was not large enough. Copy the partial
1102 * result out to header, and then append the result of further
1103 * reading the stream.
1104 */
1105 strbuf_add(header, buffer, stream->next_out - (unsigned char *)buffer);
1106 stream->next_out = buffer;
1107 stream->avail_out = bufsiz;
d131b7af 1108
46f03448
KN
1109 do {
1110 status = git_inflate(stream, 0);
1111 strbuf_add(header, buffer, stream->next_out - (unsigned char *)buffer);
1112 if (memchr(buffer, '\0', stream->next_out - (unsigned char *)buffer))
1113 return 0;
1114 stream->next_out = buffer;
1115 stream->avail_out = bufsiz;
1116 } while (status != Z_STREAM_END);
1117 return -1;
d131b7af
SP
1118}
1119
00a7760e
JK
1120static void *unpack_loose_rest(git_zstream *stream,
1121 void *buffer, unsigned long size,
1122 const struct object_id *oid)
95099731 1123{
5180cacc 1124 int bytes = strlen(buffer) + 1;
3aee68aa 1125 unsigned char *buf = xmallocz(size);
93821bd9 1126 unsigned long n;
7efbff75 1127 int status = Z_OK;
95099731 1128
93821bd9
LT
1129 n = stream->total_out - bytes;
1130 if (n > size)
1131 n = size;
1132 memcpy(buf, (char *) buffer + bytes, n);
1133 bytes = n;
456cdf6e
LT
1134 if (bytes <= size) {
1135 /*
1136 * The above condition must be (bytes <= size), not
1137 * (bytes < size). In other words, even though we
ccf5ace0 1138 * expect no more output and set avail_out to zero,
456cdf6e
LT
1139 * the input zlib stream may have bytes that express
1140 * "this concludes the stream", and we *do* want to
1141 * eat that input.
1142 *
1143 * Otherwise we would not be able to test that we
1144 * consumed all the input to reach the expected size;
1145 * we also want to check that zlib tells us that all
1146 * went well with status == Z_STREAM_END at the end.
1147 */
5180cacc
LT
1148 stream->next_out = buf + bytes;
1149 stream->avail_out = size - bytes;
7efbff75 1150 while (status == Z_OK)
39c68542 1151 status = git_inflate(stream, Z_FINISH);
5180cacc 1152 }
456cdf6e 1153 if (status == Z_STREAM_END && !stream->avail_in) {
39c68542 1154 git_inflate_end(stream);
7efbff75 1155 return buf;
95099731
NTND
1156 }
1157
7efbff75 1158 if (status < 0)
00a7760e 1159 error(_("corrupt loose object '%s'"), oid_to_hex(oid));
7efbff75 1160 else if (stream->avail_in)
259328b7 1161 error(_("garbage at end of loose object '%s'"),
00a7760e 1162 oid_to_hex(oid));
7efbff75
JH
1163 free(buf);
1164 return NULL;
95099731
NTND
1165}
1166
d40d535b 1167/*
5180cacc
LT
1168 * We used to just use "sscanf()", but that's actually way
1169 * too permissive for what we want to check. So do an anal
1170 * object header parse by hand.
d40d535b 1171 */
00a7760e
JK
1172static int parse_loose_header_extended(const char *hdr, struct object_info *oi,
1173 unsigned int flags)
1f688557 1174{
46f03448 1175 const char *type_buf = hdr;
5180cacc 1176 unsigned long size;
46f03448 1177 int type, type_len = 0;
43057304 1178
5180cacc 1179 /*
46f03448 1180 * The type can be of any size but is followed by
21666f1a 1181 * a space.
5180cacc 1182 */
5180cacc
LT
1183 for (;;) {
1184 char c = *hdr++;
d21f8426
JH
1185 if (!c)
1186 return -1;
5180cacc
LT
1187 if (c == ' ')
1188 break;
46f03448 1189 type_len++;
5180cacc 1190 }
1f688557 1191
46f03448 1192 type = type_from_string_gently(type_buf, type_len, 1);
6ca32f47
BW
1193 if (oi->type_name)
1194 strbuf_add(oi->type_name, type_buf, type_len);
46f03448
KN
1195 /*
1196 * Set type to 0 if its an unknown object and
2e3a16b2 1197 * we're obtaining the type using '--allow-unknown-type'
46f03448
KN
1198 * option.
1199 */
19fc5e84 1200 if ((flags & OBJECT_INFO_ALLOW_UNKNOWN_TYPE) && (type < 0))
46f03448
KN
1201 type = 0;
1202 else if (type < 0)
259328b7 1203 die(_("invalid object type"));
46f03448
KN
1204 if (oi->typep)
1205 *oi->typep = type;
5180cacc
LT
1206
1207 /*
1208 * The length must follow immediately, and be in canonical
1209 * decimal format (ie "010" is not valid).
1210 */
1211 size = *hdr++ - '0';
1212 if (size > 9)
1213 return -1;
1214 if (size) {
1215 for (;;) {
1216 unsigned long c = *hdr - '0';
1217 if (c > 9)
1218 break;
1219 hdr++;
1220 size = size * 10 + c;
1b1005d1 1221 }
c01f51cc 1222 }
46f03448
KN
1223
1224 if (oi->sizep)
1225 *oi->sizep = size;
5180cacc
LT
1226
1227 /*
1228 * The length must be followed by a zero byte
1229 */
46f03448 1230 return *hdr ? -1 : type;
1f688557
JH
1231}
1232
00a7760e 1233int parse_loose_header(const char *hdr, unsigned long *sizep)
bf592c50 1234{
27b5c1a0 1235 struct object_info oi = OBJECT_INFO_INIT;
21666f1a 1236
46f03448 1237 oi.sizep = sizep;
00a7760e 1238 return parse_loose_header_extended(hdr, &oi, 0);
bf592c50
DB
1239}
1240
514c5fdd
JK
1241static int loose_object_info(struct repository *r,
1242 const struct object_id *oid,
1243 struct object_info *oi, int flags)
65c2e0c3 1244{
46f03448
KN
1245 int status = 0;
1246 unsigned long mapsize;
65c2e0c3 1247 void *map;
ef49a7a0 1248 git_zstream stream;
1af64f73 1249 char hdr[MAX_HEADER_LEN];
46f03448 1250 struct strbuf hdrbuf = STRBUF_INIT;
c84a1f3e 1251 unsigned long size_scratch;
65c2e0c3 1252
5d642e75
JK
1253 if (oi->delta_base_sha1)
1254 hashclr(oi->delta_base_sha1);
1255
052fe5ea
JK
1256 /*
1257 * If we don't care about type or size, then we don't
4ef8d1dd
JH
1258 * need to look inside the object at all. Note that we
1259 * do not optimize out the stat call, even if the
1260 * caller doesn't care about the disk-size, since our
1261 * return value implicitly indicates whether the
1262 * object even exists.
052fe5ea 1263 */
6ca32f47 1264 if (!oi->typep && !oi->type_name && !oi->sizep && !oi->contentp) {
771e7d57 1265 const char *path;
4ef8d1dd 1266 struct stat st;
61c7711c 1267 if (!oi->disk_sizep && (flags & OBJECT_INFO_QUICK))
d7a24573 1268 return quick_has_loose(r, oid) ? 0 : -1;
514c5fdd 1269 if (stat_loose_object(r, oid, &st, &path) < 0)
4ef8d1dd
JH
1270 return -1;
1271 if (oi->disk_sizep)
23c339c0 1272 *oi->disk_sizep = st.st_size;
052fe5ea
JK
1273 return 0;
1274 }
1275
514c5fdd 1276 map = map_loose_object(r, oid, &mapsize);
f0df4ed5 1277 if (!map)
dbea72a8 1278 return -1;
c84a1f3e
JT
1279
1280 if (!oi->sizep)
1281 oi->sizep = &size_scratch;
1282
23c339c0
JK
1283 if (oi->disk_sizep)
1284 *oi->disk_sizep = mapsize;
19fc5e84 1285 if ((flags & OBJECT_INFO_ALLOW_UNKNOWN_TYPE)) {
00a7760e 1286 if (unpack_loose_header_to_strbuf(&stream, map, mapsize, hdr, sizeof(hdr), &hdrbuf) < 0)
259328b7 1287 status = error(_("unable to unpack %s header with --allow-unknown-type"),
514c5fdd 1288 oid_to_hex(oid));
00a7760e 1289 } else if (unpack_loose_header(&stream, map, mapsize, hdr, sizeof(hdr)) < 0)
259328b7 1290 status = error(_("unable to unpack %s header"),
514c5fdd 1291 oid_to_hex(oid));
46f03448
KN
1292 if (status < 0)
1293 ; /* Do nothing */
1294 else if (hdrbuf.len) {
00a7760e 1295 if ((status = parse_loose_header_extended(hdrbuf.buf, oi, flags)) < 0)
259328b7 1296 status = error(_("unable to parse %s header with --allow-unknown-type"),
514c5fdd 1297 oid_to_hex(oid));
00a7760e 1298 } else if ((status = parse_loose_header_extended(hdr, oi, flags)) < 0)
514c5fdd 1299 status = error(_("unable to parse %s header"), oid_to_hex(oid));
c84a1f3e 1300
b3ea7dd3 1301 if (status >= 0 && oi->contentp) {
00a7760e
JK
1302 *oi->contentp = unpack_loose_rest(&stream, hdr,
1303 *oi->sizep, oid);
b3ea7dd3
JK
1304 if (!*oi->contentp) {
1305 git_inflate_end(&stream);
1306 status = -1;
1307 }
1308 } else
c84a1f3e
JT
1309 git_inflate_end(&stream);
1310
65c2e0c3 1311 munmap(map, mapsize);
46f03448 1312 if (status && oi->typep)
23c339c0 1313 *oi->typep = status;
c84a1f3e
JT
1314 if (oi->sizep == &size_scratch)
1315 oi->sizep = NULL;
46f03448 1316 strbuf_release(&hdrbuf);
3ab0fb06 1317 oi->whence = OI_LOOSE;
93cff9a9 1318 return (status < 0) ? status : 0;
65c2e0c3
JH
1319}
1320
8b4c0103
JT
1321int fetch_if_missing = 1;
1322
9d98354f
SB
1323int oid_object_info_extended(struct repository *r, const struct object_id *oid,
1324 struct object_info *oi, unsigned flags)
f0df4ed5 1325{
cd585e2a 1326 static struct object_info blank_oi = OBJECT_INFO_INIT;
f0df4ed5 1327 struct pack_entry e;
5b086407 1328 int rtype;
b383a13c 1329 const struct object_id *real = oid;
8b4c0103 1330 int already_retried = 0;
f0df4ed5 1331
b383a13c 1332 if (flags & OBJECT_INFO_LOOKUP_REPLACE)
9d98354f 1333 real = lookup_replace_object(r, oid);
f0df4ed5 1334
b383a13c 1335 if (is_null_oid(real))
87b5e236
JK
1336 return -1;
1337
cd585e2a
JT
1338 if (!oi)
1339 oi = &blank_oi;
1340
dfdd4afc 1341 if (!(flags & OBJECT_INFO_SKIP_CACHED)) {
62ba93ea 1342 struct cached_object *co = find_cached_object(real);
dfdd4afc
JT
1343 if (co) {
1344 if (oi->typep)
1345 *(oi->typep) = co->type;
1346 if (oi->sizep)
1347 *(oi->sizep) = co->size;
1348 if (oi->disk_sizep)
1349 *(oi->disk_sizep) = 0;
1350 if (oi->delta_base_sha1)
1351 hashclr(oi->delta_base_sha1);
6ca32f47 1352 if (oi->type_name)
debca9d2 1353 strbuf_addstr(oi->type_name, type_name(co->type));
dfdd4afc
JT
1354 if (oi->contentp)
1355 *oi->contentp = xmemdupz(co->buf, co->size);
1356 oi->whence = OI_CACHED;
1357 return 0;
1358 }
c4d9986f
NTND
1359 }
1360
8b4c0103 1361 while (1) {
42c8ce1c 1362 if (find_pack_entry(r, real, &e))
8b4c0103
JT
1363 break;
1364
024aa469
TI
1365 if (flags & OBJECT_INFO_IGNORE_LOOSE)
1366 return -1;
1367
ddd63e64 1368 /* Most likely it's a loose object. */
514c5fdd 1369 if (!loose_object_info(r, real, oi, flags))
5b086407 1370 return 0;
ddd63e64
SG
1371
1372 /* Not a loose object; someone else may have just packed it. */
2b7750c9 1373 if (!(flags & OBJECT_INFO_QUICK)) {
9d98354f 1374 reprepare_packed_git(r);
42c8ce1c 1375 if (find_pack_entry(r, real, &e))
2b7750c9
JT
1376 break;
1377 }
8b4c0103
JT
1378
1379 /* Check if it is a missing object */
1380 if (fetch_if_missing && repository_format_partial_clone &&
0f4a4fb1
JT
1381 !already_retried && r == the_repository &&
1382 !(flags & OBJECT_INFO_FOR_PREFETCH)) {
8b4c0103 1383 /*
9d98354f 1384 * TODO Investigate having fetch_object() return
8b4c0103 1385 * TODO error/success and stopping the music here.
9d98354f
SB
1386 * TODO Pass a repository struct through fetch_object,
1387 * such that arbitrary repositories work.
8b4c0103 1388 */
8708ca09 1389 fetch_objects(repository_format_partial_clone, real, 1);
8b4c0103
JT
1390 already_retried = 1;
1391 continue;
dfdd4afc 1392 }
8b4c0103
JT
1393
1394 return -1;
f0df4ed5 1395 }
3d77d877 1396
cd585e2a
JT
1397 if (oi == &blank_oi)
1398 /*
1399 * We know that the caller doesn't actually need the
1400 * information below, so return early.
1401 */
1402 return 0;
9d98354f 1403 rtype = packed_object_info(r, e.p, e.offset, oi);
412916ee 1404 if (rtype < 0) {
b383a13c 1405 mark_bad_packed_object(e.p, real->hash);
9d98354f 1406 return oid_object_info_extended(r, real, oi, 0);
3ab0fb06 1407 } else if (oi->whence == OI_PACKED) {
9a490590
JH
1408 oi->u.packed.offset = e.offset;
1409 oi->u.packed.pack = e.p;
1410 oi->u.packed.is_delta = (rtype == OBJ_REF_DELTA ||
1411 rtype == OBJ_OFS_DELTA);
3d77d877
NP
1412 }
1413
5b086407 1414 return 0;
f0df4ed5
JS
1415}
1416
3fc0dca9 1417/* returns enum object_type or negative */
9d98354f
SB
1418int oid_object_info(struct repository *r,
1419 const struct object_id *oid,
1420 unsigned long *sizep)
9a490590 1421{
5b086407 1422 enum object_type type;
27b5c1a0 1423 struct object_info oi = OBJECT_INFO_INIT;
9a490590 1424
5b086407 1425 oi.typep = &type;
9a490590 1426 oi.sizep = sizep;
9d98354f
SB
1427 if (oid_object_info_extended(r, oid, &oi,
1428 OBJECT_INFO_LOOKUP_REPLACE) < 0)
5b086407
JK
1429 return -1;
1430 return type;
9a490590
JH
1431}
1432
1b9b5c69 1433static void *read_object(struct repository *r,
cba595ab 1434 const struct object_id *oid, enum object_type *type,
f1d8130b
JT
1435 unsigned long *size)
1436{
1437 struct object_info oi = OBJECT_INFO_INIT;
1438 void *content;
1439 oi.typep = type;
1440 oi.sizep = size;
1441 oi.contentp = &content;
1442
cba595ab 1443 if (oid_object_info_extended(r, oid, &oi, 0) < 0)
f1d8130b
JT
1444 return NULL;
1445 return content;
1446}
1447
829e5c3b
PO
1448int pretend_object_file(void *buf, unsigned long len, enum object_type type,
1449 struct object_id *oid)
d66b37bb
JH
1450{
1451 struct cached_object *co;
1452
169c9c01 1453 hash_object_file(buf, len, type_name(type), oid);
98374a07 1454 if (has_object_file(oid) || find_cached_object(oid))
d66b37bb 1455 return 0;
c7353967 1456 ALLOC_GROW(cached_objects, cached_object_nr + 1, cached_object_alloc);
d66b37bb
JH
1457 co = &cached_objects[cached_object_nr++];
1458 co->size = len;
21666f1a 1459 co->type = type;
efa13f7b
JH
1460 co->buf = xmalloc(len);
1461 memcpy(co->buf, buf, len);
62ba93ea 1462 oidcpy(&co->oid, oid);
d66b37bb
JH
1463 return 0;
1464}
1465
b6c4cecc
JH
1466/*
1467 * This function dies on corrupt objects; the callers who want to
1468 * deal with them should arrange to call read_object() and give error
1469 * messages themselves.
1470 */
a3b72c89
SB
1471void *read_object_file_extended(struct repository *r,
1472 const struct object_id *oid,
b4f5aca4 1473 enum object_type *type,
1474 unsigned long *size,
1475 int lookup_replace)
ac939109 1476{
3ba7a065 1477 void *data;
b6c4cecc 1478 const struct packed_git *p;
771e7d57
JK
1479 const char *path;
1480 struct stat st;
1f2e7cea 1481 const struct object_id *repl = lookup_replace ?
a3b72c89 1482 lookup_replace_object(r, oid) : oid;
b6c4cecc 1483
3ba7a065 1484 errno = 0;
cba595ab 1485 data = read_object(r, repl, type, size);
4bbf5a26 1486 if (data)
b6c4cecc 1487 return data;
68095570 1488
25f3af3f 1489 if (errno && errno != ENOENT)
259328b7 1490 die_errno(_("failed to read object %s"), oid_to_hex(oid));
3ba7a065 1491
68095570 1492 /* die if we replaced an object with one that does not exist */
b383a13c 1493 if (repl != oid)
259328b7 1494 die(_("replacement %s not found for %s"),
b383a13c 1495 oid_to_hex(repl), oid_to_hex(oid));
68095570 1496
cba595ab 1497 if (!stat_loose_object(r, repl, &st, &path))
259328b7 1498 die(_("loose object %s (stored in %s) is corrupt"),
b383a13c 1499 oid_to_hex(repl), path);
68095570 1500
a3b72c89 1501 if ((p = has_packed_and_bad(r, repl->hash)) != NULL)
259328b7 1502 die(_("packed object %s (stored in %s) is corrupt"),
b383a13c 1503 oid_to_hex(repl), p->pack_name);
f5552aee 1504
b6c4cecc 1505 return NULL;
ac939109
NP
1506}
1507
02f0547e 1508void *read_object_with_reference(const struct object_id *oid,
21666f1a 1509 const char *required_type_name,
40469ee9 1510 unsigned long *size,
02f0547e 1511 struct object_id *actual_oid_return)
f4913f91 1512{
21666f1a 1513 enum object_type type, required_type;
f4913f91
JH
1514 void *buffer;
1515 unsigned long isize;
02f0547e 1516 struct object_id actual_oid;
f4913f91 1517
21666f1a 1518 required_type = type_from_string(required_type_name);
02f0547e 1519 oidcpy(&actual_oid, oid);
40469ee9
JH
1520 while (1) {
1521 int ref_length = -1;
1522 const char *ref_type = NULL;
f4913f91 1523
b4f5aca4 1524 buffer = read_object_file(&actual_oid, &type, &isize);
40469ee9
JH
1525 if (!buffer)
1526 return NULL;
21666f1a 1527 if (type == required_type) {
40469ee9 1528 *size = isize;
02f0547e 1529 if (actual_oid_return)
1530 oidcpy(actual_oid_return, &actual_oid);
40469ee9
JH
1531 return buffer;
1532 }
1533 /* Handle references */
21666f1a 1534 else if (type == OBJ_COMMIT)
40469ee9 1535 ref_type = "tree ";
21666f1a 1536 else if (type == OBJ_TAG)
40469ee9
JH
1537 ref_type = "object ";
1538 else {
1539 free(buffer);
1540 return NULL;
1541 }
1542 ref_length = strlen(ref_type);
f4913f91 1543
94b5e093 1544 if (ref_length + the_hash_algo->hexsz > isize ||
50974ec9 1545 memcmp(buffer, ref_type, ref_length) ||
02f0547e 1546 get_oid_hex((char *) buffer + ref_length, &actual_oid)) {
40469ee9
JH
1547 free(buffer);
1548 return NULL;
1549 }
1cf58e72 1550 free(buffer);
40469ee9 1551 /* Now we have the ID of the referred-to object in
02f0547e 1552 * actual_oid. Check again. */
f4913f91 1553 }
f4913f91
JH
1554}
1555
a09c985e
PO
1556static void write_object_file_prepare(const void *buf, unsigned long len,
1557 const char *type, struct object_id *oid,
1558 char *hdr, int *hdrlen)
d410c0f5 1559{
18e2588e 1560 git_hash_ctx c;
d410c0f5
JH
1561
1562 /* Generate the header */
ca473cef 1563 *hdrlen = xsnprintf(hdr, *hdrlen, "%s %"PRIuMAX , type, (uintmax_t)len)+1;
d410c0f5
JH
1564
1565 /* Sha1.. */
18e2588e 1566 the_hash_algo->init_fn(&c);
1567 the_hash_algo->update_fn(&c, hdr, *hdrlen);
1568 the_hash_algo->update_fn(&c, buf, len);
0fd90dab 1569 the_hash_algo->final_fn(oid->hash, &c);
d410c0f5
JH
1570}
1571
230f1322 1572/*
5a688fe4 1573 * Move the just written object into its final resting place.
230f1322 1574 */
cb5add58 1575int finalize_object_file(const char *tmpfile, const char *filename)
230f1322 1576{
e32c0a9c 1577 int ret = 0;
5a688fe4 1578
348df166 1579 if (object_creation_mode == OBJECT_CREATION_USES_RENAMES)
be66a6c4
JS
1580 goto try_rename;
1581 else if (link(tmpfile, filename))
e32c0a9c 1582 ret = errno;
7ebb6fca
LT
1583
1584 /*
1585 * Coda hack - coda doesn't like cross-directory links,
1586 * so we fall back to a rename, which will mean that it
1587 * won't be able to check collisions, but that's not a
1588 * big deal.
1589 *
1590 * The same holds for FAT formatted media.
1591 *
3be1f18e 1592 * When this succeeds, we just return. We have nothing
7ebb6fca
LT
1593 * left to unlink.
1594 */
1595 if (ret && ret != EEXIST) {
be66a6c4 1596 try_rename:
7ebb6fca 1597 if (!rename(tmpfile, filename))
3be1f18e 1598 goto out;
9e48b389 1599 ret = errno;
230f1322 1600 }
691f1a28 1601 unlink_or_warn(tmpfile);
230f1322
LT
1602 if (ret) {
1603 if (ret != EEXIST) {
2c319886 1604 return error_errno(_("unable to write file %s"), filename);
230f1322
LT
1605 }
1606 /* FIXME!!! Collision check here ? */
1607 }
1608
3be1f18e 1609out:
5256b006 1610 if (adjust_shared_perm(filename))
259328b7 1611 return error(_("unable to set permission to '%s'"), filename);
230f1322
LT
1612 return 0;
1613}
1614
4d548150
LT
1615static int write_buffer(int fd, const void *buf, size_t len)
1616{
d34cf19b 1617 if (write_in_full(fd, buf, len) < 0)
259328b7 1618 return error_errno(_("file write error"));
4d548150
LT
1619 return 0;
1620}
1621
f070facc
PO
1622int hash_object_file(const void *buf, unsigned long len, const char *type,
1623 struct object_id *oid)
abdc3fc8 1624{
1af64f73 1625 char hdr[MAX_HEADER_LEN];
ef1286d3 1626 int hdrlen = sizeof(hdr);
a09c985e 1627 write_object_file_prepare(buf, len, type, oid, hdr, &hdrlen);
abdc3fc8
RS
1628 return 0;
1629}
1630
e9039dd3 1631/* Finalize a file on disk, and close it. */
514c5fdd 1632static void close_loose_object(int fd)
e9039dd3 1633{
aafe9fba 1634 if (fsync_object_files)
76011357 1635 fsync_or_die(fd, "loose object file");
e9039dd3 1636 if (close(fd) != 0)
76011357 1637 die_errno(_("error when closing loose object file"));
e9039dd3
LT
1638}
1639
5723fe7e
LT
1640/* Size of directory component, including the ending '/' */
1641static inline int directory_size(const char *filename)
1642{
1643 const char *s = strrchr(filename, '/');
1644 if (!s)
1645 return 0;
1646 return s - filename + 1;
1647}
1648
1649/*
1650 * This creates a temporary file in the same directory as the final
1651 * 'filename'
1652 *
1653 * We want to avoid cross-directory filename renames, because those
1654 * can have problems on various filesystems (FAT, NFS, Coda).
1655 */
d4b3d11a 1656static int create_tmpfile(struct strbuf *tmp, const char *filename)
5723fe7e
LT
1657{
1658 int fd, dirlen = directory_size(filename);
1659
d4b3d11a
JK
1660 strbuf_reset(tmp);
1661 strbuf_add(tmp, filename, dirlen);
1662 strbuf_addstr(tmp, "tmp_obj_XXXXXX");
1663 fd = git_mkstemp_mode(tmp->buf, 0444);
cbacbf4e 1664 if (fd < 0 && dirlen && errno == ENOENT) {
d4b3d11a
JK
1665 /*
1666 * Make sure the directory exists; note that the contents
1667 * of the buffer are undefined after mkstemp returns an
1668 * error, so we have to rewrite the whole buffer from
1669 * scratch.
1670 */
1671 strbuf_reset(tmp);
1672 strbuf_add(tmp, filename, dirlen - 1);
1673 if (mkdir(tmp->buf, 0777) && errno != EEXIST)
b2476a60 1674 return -1;
d4b3d11a 1675 if (adjust_shared_perm(tmp->buf))
5723fe7e
LT
1676 return -1;
1677
1678 /* Try again */
d4b3d11a
JK
1679 strbuf_addstr(tmp, "/tmp_obj_XXXXXX");
1680 fd = git_mkstemp_mode(tmp->buf, 0444);
5723fe7e
LT
1681 }
1682 return fd;
1683}
1684
3fc7281f
PO
1685static int write_loose_object(const struct object_id *oid, char *hdr,
1686 int hdrlen, const void *buf, unsigned long len,
1687 time_t mtime)
0fcfd160 1688{
915308b1 1689 int fd, ret;
9892beba 1690 unsigned char compressed[4096];
ef49a7a0 1691 git_zstream stream;
18e2588e 1692 git_hash_ctx c;
3fc7281f 1693 struct object_id parano_oid;
d4b3d11a 1694 static struct strbuf tmp_file = STRBUF_INIT;
ea657730
CC
1695 static struct strbuf filename = STRBUF_INIT;
1696
514c5fdd 1697 loose_object_path(the_repository, &filename, oid);
a44c9a5e 1698
ea657730 1699 fd = create_tmpfile(&tmp_file, filename.buf);
aac17941 1700 if (fd < 0) {
35243577 1701 if (errno == EACCES)
259328b7 1702 return error(_("insufficient permission for adding an object to repository database %s"), get_object_directory());
916d081b 1703 else
259328b7 1704 return error_errno(_("unable to create temporary file"));
aac17941
LT
1705 }
1706
0fcfd160 1707 /* Set it up */
55bb5c91 1708 git_deflate_init(&stream, zlib_compression_level);
0fcfd160 1709 stream.next_out = compressed;
9892beba 1710 stream.avail_out = sizeof(compressed);
18e2588e 1711 the_hash_algo->init_fn(&c);
a44c9a5e
LT
1712
1713 /* First header.. */
d65a16f6 1714 stream.next_in = (unsigned char *)hdr;
a44c9a5e 1715 stream.avail_in = hdrlen;
55bb5c91
JH
1716 while (git_deflate(&stream, 0) == Z_OK)
1717 ; /* nothing */
18e2588e 1718 the_hash_algo->update_fn(&c, hdr, hdrlen);
a44c9a5e
LT
1719
1720 /* Then the data itself.. */
c00e657d 1721 stream.next_in = (void *)buf;
a44c9a5e 1722 stream.avail_in = len;
9892beba 1723 do {
748af44c 1724 unsigned char *in0 = stream.next_in;
55bb5c91 1725 ret = git_deflate(&stream, Z_FINISH);
18e2588e 1726 the_hash_algo->update_fn(&c, in0, stream.next_in - in0);
9892beba 1727 if (write_buffer(fd, compressed, stream.next_out - compressed) < 0)
76011357 1728 die(_("unable to write loose object file"));
9892beba
NP
1729 stream.next_out = compressed;
1730 stream.avail_out = sizeof(compressed);
1731 } while (ret == Z_OK);
1732
ac54c277 1733 if (ret != Z_STREAM_END)
259328b7 1734 die(_("unable to deflate new object %s (%d)"), oid_to_hex(oid),
3fc7281f 1735 ret);
55bb5c91 1736 ret = git_deflate_end_gently(&stream);
ac54c277 1737 if (ret != Z_OK)
259328b7 1738 die(_("deflateEnd on object %s failed (%d)"), oid_to_hex(oid),
3fc7281f 1739 ret);
18e2588e 1740 the_hash_algo->final_fn(parano_oid.hash, &c);
9001dc2a 1741 if (!oideq(oid, &parano_oid))
259328b7 1742 die(_("confused by unstable object source data for %s"),
3fc7281f 1743 oid_to_hex(oid));
ac54c277 1744
514c5fdd 1745 close_loose_object(fd);
0fcfd160 1746
bbac7311
NP
1747 if (mtime) {
1748 struct utimbuf utb;
1749 utb.actime = mtime;
1750 utb.modtime = mtime;
d4b3d11a 1751 if (utime(tmp_file.buf, &utb) < 0)
259328b7 1752 warning_errno(_("failed utime() on %s"), tmp_file.buf);
bbac7311
NP
1753 }
1754
ea657730 1755 return finalize_object_file(tmp_file.buf, filename.buf);
0fcfd160 1756}
8237b185 1757
6862ebbf 1758static int freshen_loose_object(const struct object_id *oid)
33d4221c 1759{
6862ebbf 1760 return check_and_freshen(oid, 1);
33d4221c
JK
1761}
1762
6862ebbf 1763static int freshen_packed_object(const struct object_id *oid)
33d4221c
JK
1764{
1765 struct pack_entry e;
544443cb 1766 if (!find_pack_entry(the_repository, oid, &e))
ee1c6c34
JK
1767 return 0;
1768 if (e.p->freshened)
1769 return 1;
1770 if (!freshen_file(e.p->pack_name))
1771 return 0;
1772 e.p->freshened = 1;
1773 return 1;
33d4221c
JK
1774}
1775
a09c985e
PO
1776int write_object_file(const void *buf, unsigned long len, const char *type,
1777 struct object_id *oid)
bbac7311 1778{
1af64f73 1779 char hdr[MAX_HEADER_LEN];
ef1286d3 1780 int hdrlen = sizeof(hdr);
bbac7311
NP
1781
1782 /* Normally if we have it in the pack then we do not bother writing
1783 * it out into .git/objects/??/?{38} file.
1784 */
a09c985e 1785 write_object_file_prepare(buf, len, type, oid, hdr, &hdrlen);
6862ebbf 1786 if (freshen_packed_object(oid) || freshen_loose_object(oid))
bbac7311 1787 return 0;
3fc7281f 1788 return write_loose_object(oid, hdr, hdrlen, buf, len, 0);
bbac7311
NP
1789}
1790
1752cbbc
PO
1791int hash_object_file_literally(const void *buf, unsigned long len,
1792 const char *type, struct object_id *oid,
1793 unsigned flags)
0c3db67c
ES
1794{
1795 char *header;
1796 int hdrlen, status = 0;
1797
1798 /* type string, SP, %lu of the length plus NUL must fit this */
1af64f73 1799 hdrlen = strlen(type) + MAX_HEADER_LEN;
ef1286d3 1800 header = xmalloc(hdrlen);
a09c985e 1801 write_object_file_prepare(buf, len, type, oid, header, &hdrlen);
0c3db67c
ES
1802
1803 if (!(flags & HASH_WRITE_OBJECT))
1804 goto cleanup;
6862ebbf 1805 if (freshen_packed_object(oid) || freshen_loose_object(oid))
0c3db67c 1806 goto cleanup;
3fc7281f 1807 status = write_loose_object(oid, header, hdrlen, buf, len, 0);
0c3db67c
ES
1808
1809cleanup:
1810 free(header);
1811 return status;
1812}
1813
4bdb70a4 1814int force_object_loose(const struct object_id *oid, time_t mtime)
bbac7311 1815{
bbac7311
NP
1816 void *buf;
1817 unsigned long len;
1818 enum object_type type;
1af64f73 1819 char hdr[MAX_HEADER_LEN];
bbac7311 1820 int hdrlen;
1fb23e65 1821 int ret;
bbac7311 1822
6862ebbf 1823 if (has_loose_object(oid))
bbac7311 1824 return 0;
cba595ab 1825 buf = read_object(the_repository, oid, &type, &len);
bbac7311 1826 if (!buf)
2c319886 1827 return error(_("cannot read object for %s"), oid_to_hex(oid));
ca473cef 1828 hdrlen = xsnprintf(hdr, sizeof(hdr), "%s %"PRIuMAX , type_name(type), (uintmax_t)len) + 1;
3fc7281f 1829 ret = write_loose_object(oid, hdr, hdrlen, buf, len, mtime);
1fb23e65
BS
1830 free(buf);
1831
1832 return ret;
bbac7311
NP
1833}
1834
cba595ab
JH
1835int repo_has_object_file_with_flags(struct repository *r,
1836 const struct object_id *oid, int flags)
8237b185 1837{
3e8b7d3c
JN
1838 if (!startup_info->have_repository)
1839 return 0;
cba595ab 1840 return oid_object_info_extended(r, oid, NULL,
abef9020 1841 flags | OBJECT_INFO_SKIP_CACHED) >= 0;
b419aa25 1842}
1843
9b45f499
SB
1844int repo_has_object_file(struct repository *r,
1845 const struct object_id *oid)
b419aa25 1846{
cba595ab 1847 return repo_has_object_file_with_flags(r, oid, 0);
5827a035
JK
1848}
1849
c879daa2
NTND
1850static void check_tree(const void *buf, size_t size)
1851{
1852 struct tree_desc desc;
1853 struct name_entry entry;
1854
1855 init_tree_desc(&desc, buf, size);
1856 while (tree_entry(&desc, &entry))
1857 /* do nothing
1858 * tree_entry() will die() on malformed entries */
1859 ;
1860}
1861
1862static void check_commit(const void *buf, size_t size)
1863{
1864 struct commit c;
1865 memset(&c, 0, sizeof(c));
08f4f445 1866 if (parse_commit_buffer(the_repository, &c, buf, size, 0))
259328b7 1867 die(_("corrupt commit"));
c879daa2
NTND
1868}
1869
1870static void check_tag(const void *buf, size_t size)
1871{
1872 struct tag t;
1873 memset(&t, 0, sizeof(t));
0e740fed 1874 if (parse_tag_buffer(the_repository, &t, buf, size))
259328b7 1875 die(_("corrupt tag"));
c879daa2
NTND
1876}
1877
58bf2a4c
NTND
1878static int index_mem(struct index_state *istate,
1879 struct object_id *oid, void *buf, size_t size,
c4ce46fc
JH
1880 enum object_type type,
1881 const char *path, unsigned flags)
e7332f96 1882{
6c510bee 1883 int ret, re_allocated = 0;
c4ce46fc 1884 int write_object = flags & HASH_WRITE_OBJECT;
74400e71 1885
7672db20 1886 if (!type)
edaec3fb 1887 type = OBJ_BLOB;
6c510bee
LT
1888
1889 /*
1890 * Convert blobs to git internal format
1891 */
43df4f86 1892 if ((type == OBJ_BLOB) && path) {
f285a2d7 1893 struct strbuf nbuf = STRBUF_INIT;
58bf2a4c 1894 if (convert_to_git(istate, path, buf, size, &nbuf,
8462ff43 1895 get_conv_flags(flags))) {
b315c5c0 1896 buf = strbuf_detach(&nbuf, &size);
6c510bee
LT
1897 re_allocated = 1;
1898 }
1899 }
c4ce46fc 1900 if (flags & HASH_FORMAT_CHECK) {
c879daa2
NTND
1901 if (type == OBJ_TREE)
1902 check_tree(buf, size);
1903 if (type == OBJ_COMMIT)
1904 check_commit(buf, size);
1905 if (type == OBJ_TAG)
1906 check_tag(buf, size);
1907 }
6c510bee 1908
7672db20 1909 if (write_object)
169c9c01 1910 ret = write_object_file(buf, size, type_name(type), oid);
abdc3fc8 1911 else
169c9c01 1912 ret = hash_object_file(buf, size, type_name(type), oid);
43df4f86 1913 if (re_allocated)
6c510bee 1914 free(buf);
43df4f86
DP
1915 return ret;
1916}
1917
58bf2a4c
NTND
1918static int index_stream_convert_blob(struct index_state *istate,
1919 struct object_id *oid,
1920 int fd,
1921 const char *path,
1922 unsigned flags)
9035d75a
SP
1923{
1924 int ret;
1925 const int write_object = flags & HASH_WRITE_OBJECT;
1926 struct strbuf sbuf = STRBUF_INIT;
1927
1928 assert(path);
58bf2a4c 1929 assert(would_convert_to_git_filter_fd(istate, path));
9035d75a 1930
58bf2a4c 1931 convert_to_git_filter_fd(istate, path, fd, &sbuf,
8462ff43 1932 get_conv_flags(flags));
9035d75a
SP
1933
1934 if (write_object)
169c9c01 1935 ret = write_object_file(sbuf.buf, sbuf.len, type_name(OBJ_BLOB),
a09c985e 1936 oid);
9035d75a 1937 else
169c9c01 1938 ret = hash_object_file(sbuf.buf, sbuf.len, type_name(OBJ_BLOB),
f070facc 1939 oid);
9035d75a
SP
1940 strbuf_release(&sbuf);
1941 return ret;
1942}
1943
58bf2a4c
NTND
1944static int index_pipe(struct index_state *istate, struct object_id *oid,
1945 int fd, enum object_type type,
7b41e1e1
JH
1946 const char *path, unsigned flags)
1947{
1948 struct strbuf sbuf = STRBUF_INIT;
1949 int ret;
1950
1951 if (strbuf_read(&sbuf, fd, 4096) >= 0)
58bf2a4c 1952 ret = index_mem(istate, oid, sbuf.buf, sbuf.len, type, path, flags);
7b41e1e1
JH
1953 else
1954 ret = -1;
1955 strbuf_release(&sbuf);
1956 return ret;
1957}
1958
ea68b0ce
DP
1959#define SMALL_FILE_SIZE (32*1024)
1960
58bf2a4c
NTND
1961static int index_core(struct index_state *istate,
1962 struct object_id *oid, int fd, size_t size,
7b41e1e1
JH
1963 enum object_type type, const char *path,
1964 unsigned flags)
43df4f86
DP
1965{
1966 int ret;
43df4f86 1967
7b41e1e1 1968 if (!size) {
58bf2a4c 1969 ret = index_mem(istate, oid, "", size, type, path, flags);
ea68b0ce
DP
1970 } else if (size <= SMALL_FILE_SIZE) {
1971 char *buf = xmalloc(size);
90dca671
JK
1972 ssize_t read_result = read_in_full(fd, buf, size);
1973 if (read_result < 0)
259328b7 1974 ret = error_errno(_("read error while indexing %s"),
90dca671
JK
1975 path ? path : "<unknown>");
1976 else if (read_result != size)
259328b7 1977 ret = error(_("short read while indexing %s"),
90dca671 1978 path ? path : "<unknown>");
ea68b0ce 1979 else
58bf2a4c 1980 ret = index_mem(istate, oid, buf, size, type, path, flags);
ea68b0ce 1981 free(buf);
08bda208 1982 } else {
43df4f86 1983 void *buf = xmmap(NULL, size, PROT_READ, MAP_PRIVATE, fd, 0);
58bf2a4c 1984 ret = index_mem(istate, oid, buf, size, type, path, flags);
aac17941 1985 munmap(buf, size);
08bda208 1986 }
7b41e1e1
JH
1987 return ret;
1988}
1989
4dd1fbc7 1990/*
568508e7
JH
1991 * This creates one packfile per large blob unless bulk-checkin
1992 * machinery is "plugged".
4dd1fbc7
JH
1993 *
1994 * This also bypasses the usual "convert-to-git" dance, and that is on
1995 * purpose. We could write a streaming version of the converting
1996 * functions and insert that before feeding the data to fast-import
4f22b101
JK
1997 * (or equivalent in-core API described above). However, that is
1998 * somewhat complicated, as we do not know the size of the filter
1999 * result, which we need to know beforehand when writing a git object.
2000 * Since the primary motivation for trying to stream from the working
2001 * tree file and to avoid mmaping it in core is to deal with large
2002 * binary blobs, they generally do not want to get any conversion, and
2003 * callers should avoid this code path when filters are requested.
4dd1fbc7 2004 */
7d5e1dc3 2005static int index_stream(struct object_id *oid, int fd, size_t size,
4dd1fbc7
JH
2006 enum object_type type, const char *path,
2007 unsigned flags)
2008{
68ee6dfc 2009 return index_bulk_checkin(oid, fd, size, type, path, flags);
4dd1fbc7
JH
2010}
2011
58bf2a4c
NTND
2012int index_fd(struct index_state *istate, struct object_id *oid,
2013 int fd, struct stat *st,
7b41e1e1
JH
2014 enum object_type type, const char *path, unsigned flags)
2015{
2016 int ret;
7b41e1e1 2017
9079ab7c
SP
2018 /*
2019 * Call xsize_t() only when needed to avoid potentially unnecessary
2020 * die() for large files.
2021 */
58bf2a4c
NTND
2022 if (type == OBJ_BLOB && path && would_convert_to_git_filter_fd(istate, path))
2023 ret = index_stream_convert_blob(istate, oid, fd, path, flags);
9035d75a 2024 else if (!S_ISREG(st->st_mode))
58bf2a4c 2025 ret = index_pipe(istate, oid, fd, type, path, flags);
9079ab7c 2026 else if (st->st_size <= big_file_threshold || type != OBJ_BLOB ||
58bf2a4c
NTND
2027 (path && would_convert_to_git(istate, path)))
2028 ret = index_core(istate, oid, fd, xsize_t(st->st_size),
2029 type, path, flags);
4dd1fbc7 2030 else
7d5e1dc3 2031 ret = index_stream(oid, fd, xsize_t(st->st_size), type, path,
9079ab7c 2032 flags);
43df4f86 2033 close(fd);
aac17941 2034 return ret;
74400e71 2035}
ec1fcc16 2036
58bf2a4c
NTND
2037int index_path(struct index_state *istate, struct object_id *oid,
2038 const char *path, struct stat *st, unsigned flags)
ec1fcc16
JH
2039{
2040 int fd;
b760d3aa 2041 struct strbuf sb = STRBUF_INIT;
ea8e0297 2042 int rc = 0;
ec1fcc16
JH
2043
2044 switch (st->st_mode & S_IFMT) {
2045 case S_IFREG:
2046 fd = open(path, O_RDONLY);
2047 if (fd < 0)
7616c6ca 2048 return error_errno("open(\"%s\")", path);
58bf2a4c 2049 if (index_fd(istate, oid, fd, st, OBJ_BLOB, path, flags) < 0)
259328b7 2050 return error(_("%s: failed to insert into database"),
ec1fcc16
JH
2051 path);
2052 break;
2053 case S_IFLNK:
7616c6ca
NTND
2054 if (strbuf_readlink(&sb, path, st->st_size))
2055 return error_errno("readlink(\"%s\")", path);
c4ce46fc 2056 if (!(flags & HASH_WRITE_OBJECT))
f070facc 2057 hash_object_file(sb.buf, sb.len, blob_type, oid);
a09c985e 2058 else if (write_object_file(sb.buf, sb.len, blob_type, oid))
259328b7 2059 rc = error(_("%s: failed to insert into database"), path);
b760d3aa 2060 strbuf_release(&sb);
ec1fcc16 2061 break;
f35a6d3b 2062 case S_IFDIR:
a98e6101 2063 return resolve_gitlink_ref(path, "HEAD", oid);
ec1fcc16 2064 default:
259328b7 2065 return error(_("%s: unsupported file type"), path);
ec1fcc16 2066 }
ea8e0297 2067 return rc;
ec1fcc16 2068}
a69e5429
JH
2069
2070int read_pack_header(int fd, struct pack_header *header)
2071{
f48ecd38 2072 if (read_in_full(fd, header, sizeof(*header)) != sizeof(*header))
c697ad14
HO
2073 /* "eof before pack header was fully read" */
2074 return PH_ERROR_EOF;
2075
a69e5429
JH
2076 if (header->hdr_signature != htonl(PACK_SIGNATURE))
2077 /* "protocol error (pack signature mismatch detected)" */
2078 return PH_ERROR_PACK_SIGNATURE;
2079 if (!pack_version_ok(header->hdr_version))
2080 /* "protocol error (pack version unsupported)" */
2081 return PH_ERROR_PROTOCOL;
2082 return 0;
2083}
40d52ff7 2084
e816caa0 2085void assert_oid_type(const struct object_id *oid, enum object_type expect)
40d52ff7 2086{
0df8e965 2087 enum object_type type = oid_object_info(the_repository, oid, NULL);
40d52ff7 2088 if (type < 0)
259328b7 2089 die(_("%s is not a valid object"), oid_to_hex(oid));
40d52ff7 2090 if (type != expect)
259328b7 2091 die(_("%s is not a valid '%s' object"), oid_to_hex(oid),
debca9d2 2092 type_name(expect));
40d52ff7 2093}
27e1e22d 2094
70c49050 2095int for_each_file_in_obj_subdir(unsigned int subdir_nr,
cc817ca3
RS
2096 struct strbuf *path,
2097 each_loose_object_fn obj_cb,
2098 each_loose_cruft_fn cruft_cb,
2099 each_loose_subdir_fn subdir_cb,
2100 void *data)
27e1e22d 2101{
0375f472
RS
2102 size_t origlen, baselen;
2103 DIR *dir;
27e1e22d
JK
2104 struct dirent *de;
2105 int r = 0;
62a24c89 2106 struct object_id oid;
27e1e22d 2107
70c49050
RS
2108 if (subdir_nr > 0xff)
2109 BUG("invalid loose object subdirectory: %x", subdir_nr);
2110
0375f472
RS
2111 origlen = path->len;
2112 strbuf_complete(path, '/');
2113 strbuf_addf(path, "%02x", subdir_nr);
0375f472
RS
2114
2115 dir = opendir(path->buf);
27e1e22d 2116 if (!dir) {
0375f472 2117 if (errno != ENOENT)
259328b7 2118 r = error_errno(_("unable to open %s"), path->buf);
0375f472
RS
2119 strbuf_setlen(path, origlen);
2120 return r;
27e1e22d
JK
2121 }
2122
62a24c89 2123 oid.hash[0] = subdir_nr;
163ee5e6
DS
2124 strbuf_addch(path, '/');
2125 baselen = path->len;
62a24c89 2126
27e1e22d 2127 while ((de = readdir(dir))) {
163ee5e6 2128 size_t namelen;
27e1e22d
JK
2129 if (is_dot_or_dotdot(de->d_name))
2130 continue;
2131
163ee5e6 2132 namelen = strlen(de->d_name);
27e1e22d 2133 strbuf_setlen(path, baselen);
163ee5e6 2134 strbuf_add(path, de->d_name, namelen);
94b5e093 2135 if (namelen == the_hash_algo->hexsz - 2 &&
62a24c89 2136 !hex_to_bytes(oid.hash + 1, de->d_name,
94b5e093 2137 the_hash_algo->rawsz - 1)) {
62a24c89
RS
2138 if (obj_cb) {
2139 r = obj_cb(&oid, path->buf, data);
2140 if (r)
2141 break;
27e1e22d 2142 }
62a24c89 2143 continue;
27e1e22d
JK
2144 }
2145
2146 if (cruft_cb) {
2147 r = cruft_cb(de->d_name, path->buf, data);
2148 if (r)
2149 break;
2150 }
2151 }
094c7e63 2152 closedir(dir);
27e1e22d 2153
163ee5e6 2154 strbuf_setlen(path, baselen - 1);
27e1e22d
JK
2155 if (!r && subdir_cb)
2156 r = subdir_cb(subdir_nr, path->buf, data);
2157
0375f472
RS
2158 strbuf_setlen(path, origlen);
2159
27e1e22d
JK
2160 return r;
2161}
2162
e6f875e0 2163int for_each_loose_file_in_objdir_buf(struct strbuf *path,
27e1e22d
JK
2164 each_loose_object_fn obj_cb,
2165 each_loose_cruft_fn cruft_cb,
2166 each_loose_subdir_fn subdir_cb,
2167 void *data)
2168{
27e1e22d
JK
2169 int r = 0;
2170 int i;
2171
27e1e22d 2172 for (i = 0; i < 256; i++) {
e6f875e0 2173 r = for_each_file_in_obj_subdir(i, path, obj_cb, cruft_cb,
27e1e22d 2174 subdir_cb, data);
27e1e22d
JK
2175 if (r)
2176 break;
2177 }
2178
e6f875e0
JK
2179 return r;
2180}
2181
2182int for_each_loose_file_in_objdir(const char *path,
2183 each_loose_object_fn obj_cb,
2184 each_loose_cruft_fn cruft_cb,
2185 each_loose_subdir_fn subdir_cb,
2186 void *data)
2187{
2188 struct strbuf buf = STRBUF_INIT;
2189 int r;
2190
2191 strbuf_addstr(&buf, path);
2192 r = for_each_loose_file_in_objdir_buf(&buf, obj_cb, cruft_cb,
2193 subdir_cb, data);
27e1e22d 2194 strbuf_release(&buf);
e6f875e0 2195
27e1e22d
JK
2196 return r;
2197}
660c889e 2198
a7ff6f5a
JK
2199int for_each_loose_object(each_loose_object_fn cb, void *data,
2200 enum for_each_object_flags flags)
660c889e 2201{
f0eaf638 2202 struct object_directory *odb;
b0a42642 2203
f0eaf638
JK
2204 prepare_alt_odb(the_repository);
2205 for (odb = the_repository->objects->odb; odb; odb = odb->next) {
2206 int r = for_each_loose_file_in_objdir(odb->path, cb, NULL,
2207 NULL, data);
2208 if (r)
2209 return r;
660c889e 2210
f0eaf638
JK
2211 if (flags & FOR_EACH_OBJECT_LOCAL_ONLY)
2212 break;
2213 }
1385bb7b 2214
f0eaf638 2215 return 0;
660c889e
JK
2216}
2217
3a2e0824
JK
2218static int append_loose_object(const struct object_id *oid, const char *path,
2219 void *data)
660c889e 2220{
3a2e0824
JK
2221 oid_array_append(data, oid);
2222 return 0;
2223}
660c889e 2224
0000d654
RS
2225struct oid_array *odb_loose_cache(struct object_directory *odb,
2226 const struct object_id *oid)
2227{
2228 int subdir_nr = oid->hash[0];
3a2e0824 2229 struct strbuf buf = STRBUF_INIT;
660c889e 2230
3a2e0824
JK
2231 if (subdir_nr < 0 ||
2232 subdir_nr >= ARRAY_SIZE(odb->loose_objects_subdir_seen))
2233 BUG("subdir_nr out of range");
1385bb7b 2234
3a2e0824 2235 if (odb->loose_objects_subdir_seen[subdir_nr])
8be88dbc 2236 return &odb->loose_objects_cache[subdir_nr];
3a2e0824
JK
2237
2238 strbuf_addstr(&buf, odb->path);
2239 for_each_file_in_obj_subdir(subdir_nr, &buf,
2240 append_loose_object,
2241 NULL, NULL,
4cea1ce0 2242 &odb->loose_objects_cache[subdir_nr]);
3a2e0824 2243 odb->loose_objects_subdir_seen[subdir_nr] = 1;
7317aa71 2244 strbuf_release(&buf);
8be88dbc 2245 return &odb->loose_objects_cache[subdir_nr];
660c889e
JK
2246}
2247
d4e19e51
RS
2248void odb_clear_loose_cache(struct object_directory *odb)
2249{
4cea1ce0
RS
2250 int i;
2251
2252 for (i = 0; i < ARRAY_SIZE(odb->loose_objects_cache); i++)
2253 oid_array_clear(&odb->loose_objects_cache[i]);
d4e19e51
RS
2254 memset(&odb->loose_objects_subdir_seen, 0,
2255 sizeof(odb->loose_objects_subdir_seen));
2256}
2257
00a7760e
JK
2258static int check_stream_oid(git_zstream *stream,
2259 const char *hdr,
2260 unsigned long size,
2261 const char *path,
2262 const struct object_id *expected_oid)
f6371f92 2263{
18e2588e 2264 git_hash_ctx c;
00a7760e 2265 struct object_id real_oid;
f6371f92
JK
2266 unsigned char buf[4096];
2267 unsigned long total_read;
2268 int status = Z_OK;
2269
18e2588e 2270 the_hash_algo->init_fn(&c);
2271 the_hash_algo->update_fn(&c, hdr, stream->total_out);
f6371f92
JK
2272
2273 /*
2274 * We already read some bytes into hdr, but the ones up to the NUL
2275 * do not count against the object's content size.
2276 */
2277 total_read = stream->total_out - strlen(hdr) - 1;
2278
2279 /*
2280 * This size comparison must be "<=" to read the final zlib packets;
00a7760e 2281 * see the comment in unpack_loose_rest for details.
f6371f92
JK
2282 */
2283 while (total_read <= size &&
18ad13e5
JH
2284 (status == Z_OK ||
2285 (status == Z_BUF_ERROR && !stream->avail_out))) {
f6371f92
JK
2286 stream->next_out = buf;
2287 stream->avail_out = sizeof(buf);
2288 if (size - total_read < stream->avail_out)
2289 stream->avail_out = size - total_read;
2290 status = git_inflate(stream, Z_FINISH);
18e2588e 2291 the_hash_algo->update_fn(&c, buf, stream->next_out - buf);
f6371f92
JK
2292 total_read += stream->next_out - buf;
2293 }
2294 git_inflate_end(stream);
2295
2296 if (status != Z_STREAM_END) {
00a7760e 2297 error(_("corrupt loose object '%s'"), oid_to_hex(expected_oid));
f6371f92
JK
2298 return -1;
2299 }
cce044df 2300 if (stream->avail_in) {
259328b7 2301 error(_("garbage at end of loose object '%s'"),
00a7760e 2302 oid_to_hex(expected_oid));
cce044df
JK
2303 return -1;
2304 }
f6371f92 2305
00a7760e
JK
2306 the_hash_algo->final_fn(real_oid.hash, &c);
2307 if (!oideq(expected_oid, &real_oid)) {
01f8d594 2308 error(_("hash mismatch for %s (expected %s)"), path,
00a7760e 2309 oid_to_hex(expected_oid));
f6371f92
JK
2310 return -1;
2311 }
2312
2313 return 0;
2314}
2315
2316int read_loose_object(const char *path,
d61d87bd 2317 const struct object_id *expected_oid,
f6371f92
JK
2318 enum object_type *type,
2319 unsigned long *size,
2320 void **contents)
2321{
2322 int ret = -1;
f6371f92
JK
2323 void *map = NULL;
2324 unsigned long mapsize;
2325 git_zstream stream;
1af64f73 2326 char hdr[MAX_HEADER_LEN];
f6371f92
JK
2327
2328 *contents = NULL;
2329
514c5fdd 2330 map = map_loose_object_1(the_repository, path, NULL, &mapsize);
f6371f92 2331 if (!map) {
259328b7 2332 error_errno(_("unable to mmap %s"), path);
f6371f92
JK
2333 goto out;
2334 }
2335
00a7760e 2336 if (unpack_loose_header(&stream, map, mapsize, hdr, sizeof(hdr)) < 0) {
259328b7 2337 error(_("unable to unpack header of %s"), path);
f6371f92
JK
2338 goto out;
2339 }
2340
00a7760e 2341 *type = parse_loose_header(hdr, size);
f6371f92 2342 if (*type < 0) {
259328b7 2343 error(_("unable to parse header of %s"), path);
f6371f92
JK
2344 git_inflate_end(&stream);
2345 goto out;
2346 }
2347
7ac4f3a0 2348 if (*type == OBJ_BLOB && *size > big_file_threshold) {
00a7760e 2349 if (check_stream_oid(&stream, hdr, *size, path, expected_oid) < 0)
f6371f92
JK
2350 goto out;
2351 } else {
00a7760e 2352 *contents = unpack_loose_rest(&stream, hdr, *size, expected_oid);
f6371f92 2353 if (!*contents) {
259328b7 2354 error(_("unable to unpack contents of %s"), path);
f6371f92
JK
2355 git_inflate_end(&stream);
2356 goto out;
2357 }
17e65451 2358 if (check_object_signature(expected_oid, *contents,
debca9d2 2359 *size, type_name(*type))) {
01f8d594 2360 error(_("hash mismatch for %s (expected %s)"), path,
d61d87bd 2361 oid_to_hex(expected_oid));
f6371f92
JK
2362 free(*contents);
2363 goto out;
2364 }
2365 }
2366
2367 ret = 0; /* everything checks out */
2368
2369out:
2370 if (map)
2371 munmap(map, mapsize);
f6371f92
JK
2372 return ret;
2373}