Sync with v2.15.1
[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"
090ea126 25#include "streaming.h"
543c5caa 26#include "dir.h"
a73cdd21 27#include "mru.h"
12d95ef6 28#include "list.h"
c4c6effa 29#include "mergesort.h"
cf3c6352 30#include "quote.h"
4f39cd82 31#include "packfile.h"
e05db0fd 32
50c5cd58 33const unsigned char null_sha1[GIT_MAX_RAWSZ];
3e56e724 34const struct object_id null_oid;
8576fde6
JK
35const struct object_id empty_tree_oid = {
36 EMPTY_TREE_SHA1_BIN_LITERAL
37};
38const struct object_id empty_blob_oid = {
39 EMPTY_BLOB_SHA1_BIN_LITERAL
40};
88cd621d 41
c597ba80
NTND
42/*
43 * This is meant to hold a *small* number of objects that you would
44 * want read_sha1_file() to be able to return, but yet you do not want
45 * to write them into the object store (e.g. a browse-only
46 * application).
47 */
48static struct cached_object {
49 unsigned char sha1[20];
50 enum object_type type;
51 void *buf;
52 unsigned long size;
53} *cached_objects;
54static int cached_object_nr, cached_object_alloc;
55
56static struct cached_object empty_tree = {
dab0d410 57 EMPTY_TREE_SHA1_BIN_LITERAL,
c597ba80
NTND
58 OBJ_TREE,
59 "",
60 0
61};
62
63static struct cached_object *find_cached_object(const unsigned char *sha1)
64{
65 int i;
66 struct cached_object *co = cached_objects;
67
68 for (i = 0; i < cached_object_nr; i++, co++) {
69 if (!hashcmp(co->sha1, sha1))
70 return co;
71 }
72 if (!hashcmp(sha1, empty_tree.sha1))
73 return &empty_tree;
74 return NULL;
75}
76
9472935d
TB
77
78static enum safe_crlf get_safe_crlf(unsigned flags)
79{
80 if (flags & HASH_RENORMALIZE)
81 return SAFE_CRLF_RENORMALIZE;
82 else if (flags & HASH_WRITE_OBJECT)
83 return safe_crlf;
84 else
85 return SAFE_CRLF_FALSE;
86}
87
88
90a6464b
JH
89int mkdir_in_gitdir(const char *path)
90{
91 if (mkdir(path, 0777)) {
92 int saved_errno = errno;
93 struct stat st;
94 struct strbuf sb = STRBUF_INIT;
95
96 if (errno != EEXIST)
97 return -1;
98 /*
99 * Are we looking at a path in a symlinked worktree
100 * whose original repository does not yet have it?
101 * e.g. .git/rr-cache pointing at its original
102 * repository in which the user hasn't performed any
103 * conflict resolution yet?
104 */
105 if (lstat(path, &st) || !S_ISLNK(st.st_mode) ||
106 strbuf_readlink(&sb, path, st.st_size) ||
107 !is_absolute_path(sb.buf) ||
108 mkdir(sb.buf, 0777)) {
109 strbuf_release(&sb);
110 errno = saved_errno;
111 return -1;
112 }
113 strbuf_release(&sb);
114 }
115 return adjust_shared_perm(path);
116}
117
0be0521b 118enum scld_error safe_create_leading_directories(char *path)
b2cb9425 119{
26c8ae2a 120 char *next_component = path + offset_1st_component(path);
0be0521b 121 enum scld_error ret = SCLD_OK;
67d42212 122
0be0521b 123 while (ret == SCLD_OK && next_component) {
f0502332 124 struct stat st;
0f527403 125 char *slash = next_component, slash_character;
f0502332 126
0f527403
MH
127 while (*slash && !is_dir_sep(*slash))
128 slash++;
129
130 if (!*slash)
b2cb9425 131 break;
bf10cf70 132
26c8ae2a 133 next_component = slash + 1;
0f527403 134 while (is_dir_sep(*next_component))
bf10cf70 135 next_component++;
26c8ae2a 136 if (!*next_component)
5f0bdf50 137 break;
831651fd 138
0f527403 139 slash_character = *slash;
831651fd 140 *slash = '\0';
67d42212
JR
141 if (!stat(path, &st)) {
142 /* path exists */
204a047f
MH
143 if (!S_ISDIR(st.st_mode)) {
144 errno = ENOTDIR;
0be0521b 145 ret = SCLD_EXISTS;
204a047f 146 }
53a39721 147 } else if (mkdir(path, 0777)) {
928734d9 148 if (errno == EEXIST &&
9e6f885d 149 !stat(path, &st) && S_ISDIR(st.st_mode))
928734d9 150 ; /* somebody created it since we checked */
18d37e86
MH
151 else if (errno == ENOENT)
152 /*
153 * Either mkdir() failed because
154 * somebody just pruned the containing
155 * directory, or stat() failed because
156 * the file that was in our way was
157 * just removed. Either way, inform
158 * the caller that it might be worth
159 * trying again:
160 */
161 ret = SCLD_VANISHED;
9e6f885d 162 else
0be0521b 163 ret = SCLD_FAILED;
53a39721 164 } else if (adjust_shared_perm(path)) {
0be0521b 165 ret = SCLD_PERMS;
457f06d6 166 }
0f527403 167 *slash = slash_character;
b2cb9425 168 }
9e6f885d 169 return ret;
b2cb9425 170}
723c31fe 171
0be0521b 172enum scld_error safe_create_leading_directories_const(const char *path)
8e21d63b 173{
02944307 174 int save_errno;
8e21d63b
JK
175 /* path points to cache entries, so xstrdup before messing with it */
176 char *buf = xstrdup(path);
0be0521b 177 enum scld_error result = safe_create_leading_directories(buf);
02944307
MH
178
179 save_errno = errno;
8e21d63b 180 free(buf);
02944307 181 errno = save_errno;
8e21d63b
JK
182 return result;
183}
184
177978f5
MH
185int raceproof_create_file(const char *path, create_file_fn fn, void *cb)
186{
187 /*
188 * The number of times we will try to remove empty directories
189 * in the way of path. This is only 1 because if another
190 * process is racily creating directories that conflict with
191 * us, we don't want to fight against them.
192 */
193 int remove_directories_remaining = 1;
194
195 /*
196 * The number of times that we will try to create the
197 * directories containing path. We are willing to attempt this
198 * more than once, because another process could be trying to
199 * clean up empty directories at the same time as we are
200 * trying to create them.
201 */
202 int create_directories_remaining = 3;
203
204 /* A scratch copy of path, filled lazily if we need it: */
205 struct strbuf path_copy = STRBUF_INIT;
206
207 int ret, save_errno;
208
209 /* Sanity check: */
210 assert(*path);
211
212retry_fn:
213 ret = fn(path, cb);
214 save_errno = errno;
215 if (!ret)
216 goto out;
217
218 if (errno == EISDIR && remove_directories_remaining-- > 0) {
219 /*
220 * A directory is in the way. Maybe it is empty; try
221 * to remove it:
222 */
223 if (!path_copy.len)
224 strbuf_addstr(&path_copy, path);
225
226 if (!remove_dir_recursively(&path_copy, REMOVE_DIR_EMPTY_ONLY))
227 goto retry_fn;
228 } else if (errno == ENOENT && create_directories_remaining-- > 0) {
229 /*
230 * Maybe the containing directory didn't exist, or
231 * maybe it was just deleted by a process that is
232 * racing with us to clean up empty directories. Try
233 * to create it:
234 */
235 enum scld_error scld_result;
236
237 if (!path_copy.len)
238 strbuf_addstr(&path_copy, path);
239
240 do {
241 scld_result = safe_create_leading_directories(path_copy.buf);
242 if (scld_result == SCLD_OK)
243 goto retry_fn;
244 } while (scld_result == SCLD_VANISHED && create_directories_remaining-- > 0);
245 }
246
247out:
248 strbuf_release(&path_copy);
249 errno = save_errno;
250 return ret;
251}
252
f7b7774f 253static void fill_sha1_path(struct strbuf *buf, const unsigned char *sha1)
ace1534d
JH
254{
255 int i;
256 for (i = 0; i < 20; i++) {
257 static char hex[] = "0123456789abcdef";
258 unsigned int val = sha1[i];
f7b7774f
JK
259 strbuf_addch(buf, hex[val >> 4]);
260 strbuf_addch(buf, hex[val & 0xf]);
afbba2f0 261 if (!i)
f7b7774f 262 strbuf_addch(buf, '/');
ace1534d
JH
263 }
264}
265
30d6c6ea 266const char *sha1_file_name(const unsigned char *sha1)
0fcfd160 267{
f7b7774f 268 static struct strbuf buf = STRBUF_INIT;
0fcfd160 269
f7b7774f
JK
270 strbuf_reset(&buf);
271 strbuf_addf(&buf, "%s/", get_object_directory());
560fb6a1 272
f7b7774f
JK
273 fill_sha1_path(&buf, sha1);
274 return buf.buf;
0fcfd160
LT
275}
276
38dbe5f0
JK
277struct strbuf *alt_scratch_buf(struct alternate_object_database *alt)
278{
279 strbuf_setlen(&alt->scratch, alt->base_len);
280 return &alt->scratch;
281}
282
29ec6af2
JK
283static const char *alt_sha1_path(struct alternate_object_database *alt,
284 const unsigned char *sha1)
285{
38dbe5f0 286 struct strbuf *buf = alt_scratch_buf(alt);
f7b7774f 287 fill_sha1_path(buf, sha1);
38dbe5f0 288 return buf->buf;
0fcfd160
LT
289}
290
d5a63b99
JH
291struct alternate_object_database *alt_odb_list;
292static struct alternate_object_database **alt_odb_tail;
ace1534d 293
4ea82473
JK
294/*
295 * Return non-zero iff the path is usable as an alternate object database.
296 */
297static int alt_odb_usable(struct strbuf *path, const char *normalized_objdir)
298{
299 struct alternate_object_database *alt;
300
301 /* Detect cases where alternate disappeared */
302 if (!is_directory(path->buf)) {
303 error("object directory %s does not exist; "
304 "check .git/objects/info/alternates.",
305 path->buf);
306 return 0;
307 }
308
309 /*
310 * Prevent the common mistake of listing the same
311 * thing twice, or object directory itself.
312 */
313 for (alt = alt_odb_list; alt; alt = alt->next) {
ea0fc3b4 314 if (!fspathcmp(path->buf, alt->path))
4ea82473
JK
315 return 0;
316 }
317 if (!fspathcmp(path->buf, normalized_objdir))
318 return 0;
319
320 return 1;
321}
322
ddd5d056
JH
323/*
324 * Prepare alternate object database registry.
d5a63b99
JH
325 *
326 * The variable alt_odb_list points at the list of struct
327 * alternate_object_database. The elements on this list come from
328 * non-empty elements from colon separated ALTERNATE_DB_ENVIRONMENT
329 * environment variable, and $GIT_OBJECT_DIRECTORY/info/alternates,
1494e038
JH
330 * whose contents is similar to that environment variable but can be
331 * LF separated. Its base points at a statically allocated buffer that
d5a63b99
JH
332 * contains "/the/directory/corresponding/to/.git/objects/...", while
333 * its name points just after the slash at the end of ".git/objects/"
334 * in the example above, and has enough space to hold 40-byte hex
335 * SHA1, an extra slash for the first level indirection, and the
336 * terminating NUL.
ddd5d056 337 */
2456990d 338static void read_info_alternates(const char * relative_base, int depth);
539e7506
EK
339static int link_alt_odb_entry(const char *entry, const char *relative_base,
340 int depth, const char *normalized_objdir)
ace1534d 341{
c2f493a4 342 struct alternate_object_database *ent;
5bdf0a84 343 struct strbuf pathbuf = STRBUF_INIT;
d5a63b99 344
85dadc38 345 if (!is_absolute_path(entry) && relative_base) {
4ac9006f 346 strbuf_realpath(&pathbuf, relative_base, 1);
5bdf0a84 347 strbuf_addch(&pathbuf, '/');
c2f493a4 348 }
6eac50d8 349 strbuf_addstr(&pathbuf, entry);
c2f493a4 350
37a95862 351 if (strbuf_normalize_path(&pathbuf) < 0 && relative_base) {
670c359d
JK
352 error("unable to normalize alternate object path: %s",
353 pathbuf.buf);
354 strbuf_release(&pathbuf);
355 return -1;
356 }
5bdf0a84
HW
357
358 /*
359 * The trailing slash after the directory name is given by
360 * this function at the end. Remove duplicates.
361 */
4ea82473
JK
362 while (pathbuf.len && pathbuf.buf[pathbuf.len - 1] == '/')
363 strbuf_setlen(&pathbuf, pathbuf.len - 1);
5bdf0a84 364
4ea82473
JK
365 if (!alt_odb_usable(&pathbuf, normalized_objdir)) {
366 strbuf_release(&pathbuf);
c2f493a4
MW
367 return -1;
368 }
369
7f0fa2c0 370 ent = alloc_alt_odb(pathbuf.buf);
c2f493a4
MW
371
372 /* add the alternate entry */
373 *alt_odb_tail = ent;
374 alt_odb_tail = &(ent->next);
375 ent->next = NULL;
376
377 /* recursively add alternates */
4ea82473 378 read_info_alternates(pathbuf.buf, depth + 1);
c2f493a4 379
4ea82473 380 strbuf_release(&pathbuf);
c2f493a4
MW
381 return 0;
382}
383
cf3c6352
JK
384static const char *parse_alt_odb_entry(const char *string,
385 int sep,
386 struct strbuf *out)
387{
388 const char *end;
389
390 strbuf_reset(out);
391
392 if (*string == '#') {
393 /* comment; consume up to next separator */
394 end = strchrnul(string, sep);
395 } else if (*string == '"' && !unquote_c_style(out, string, &end)) {
396 /*
397 * quoted path; unquote_c_style has copied the
398 * data for us and set "end". Broken quoting (e.g.,
399 * an entry that doesn't end with a quote) falls
400 * back to the unquoted case below.
401 */
402 } else {
403 /* normal, unquoted path */
404 end = strchrnul(string, sep);
405 strbuf_add(out, string, end - string);
406 }
407
408 if (*end)
409 end++;
410 return end;
411}
412
dc732bd5 413static void link_alt_odb_entries(const char *alt, int sep,
c2f493a4
MW
414 const char *relative_base, int depth)
415{
539e7506 416 struct strbuf objdirbuf = STRBUF_INIT;
cf3c6352 417 struct strbuf entry = STRBUF_INIT;
c2f493a4 418
f28e3668
JK
419 if (!alt || !*alt)
420 return;
421
c2f493a4
MW
422 if (depth > 5) {
423 error("%s: ignoring alternate object stores, nesting too deep.",
424 relative_base);
425 return;
426 }
427
f655651e 428 strbuf_add_absolute_path(&objdirbuf, get_object_directory());
670c359d
JK
429 if (strbuf_normalize_path(&objdirbuf) < 0)
430 die("unable to normalize object directory: %s",
431 objdirbuf.buf);
539e7506 432
cf3c6352
JK
433 while (*alt) {
434 alt = parse_alt_odb_entry(alt, sep, &entry);
435 if (!entry.len)
9577e7e3 436 continue;
cf3c6352 437 link_alt_odb_entry(entry.buf, relative_base, depth, objdirbuf.buf);
9577e7e3 438 }
cf3c6352 439 strbuf_release(&entry);
539e7506 440 strbuf_release(&objdirbuf);
d5a63b99
JH
441}
442
2456990d 443static void read_info_alternates(const char * relative_base, int depth)
d5a63b99 444{
5015f01c 445 char *path;
dc732bd5 446 struct strbuf buf = STRBUF_INIT;
d5a63b99 447
5015f01c 448 path = xstrfmt("%s/info/alternates", relative_base);
dc732bd5 449 if (strbuf_read_file(&buf, path, 1024) < 0) {
f0f7bebe 450 warn_on_fopen_errors(path);
dc732bd5 451 free(path);
9a217f2a 452 return;
ace1534d 453 }
d5a63b99 454
dc732bd5
JK
455 link_alt_odb_entries(buf.buf, '\n', relative_base, depth);
456 strbuf_release(&buf);
457 free(path);
ace1534d
JH
458}
459
7f0fa2c0
JK
460struct alternate_object_database *alloc_alt_odb(const char *dir)
461{
462 struct alternate_object_database *ent;
7f0fa2c0 463
597f9134 464 FLEX_ALLOC_STR(ent, path, dir);
38dbe5f0
JK
465 strbuf_init(&ent->scratch, 0);
466 strbuf_addf(&ent->scratch, "%s/", dir);
467 ent->base_len = ent->scratch.len;
7f0fa2c0
JK
468
469 return ent;
470}
471
bef70b22
DB
472void add_to_alternates_file(const char *reference)
473{
f132a127 474 struct lock_file lock = LOCK_INIT;
77b9b1d1
JK
475 char *alts = git_pathdup("objects/info/alternates");
476 FILE *in, *out;
f132a127 477 int found = 0;
77b9b1d1 478
f132a127
479 hold_lock_file_for_update(&lock, alts, LOCK_DIE_ON_ERROR);
480 out = fdopen_lock_file(&lock, "w");
77b9b1d1
JK
481 if (!out)
482 die_errno("unable to fdopen alternates lockfile");
483
484 in = fopen(alts, "r");
485 if (in) {
486 struct strbuf line = STRBUF_INIT;
77b9b1d1 487
3f163962 488 while (strbuf_getline(&line, in) != EOF) {
77b9b1d1
JK
489 if (!strcmp(reference, line.buf)) {
490 found = 1;
491 break;
492 }
493 fprintf_or_die(out, "%s\n", line.buf);
494 }
495
496 strbuf_release(&line);
497 fclose(in);
77b9b1d1
JK
498 }
499 else if (errno != ENOENT)
500 die_errno("unable to read alternates file");
501
f132a127
502 if (found) {
503 rollback_lock_file(&lock);
504 } else {
77b9b1d1 505 fprintf_or_die(out, "%s\n", reference);
f132a127 506 if (commit_lock_file(&lock))
77b9b1d1
JK
507 die_errno("unable to move new alternates file into place");
508 if (alt_odb_tail)
dc732bd5 509 link_alt_odb_entries(reference, '\n', NULL, 0);
77b9b1d1
JK
510 }
511 free(alts);
bef70b22
DB
512}
513
a5b34d21
JK
514void add_to_alternates_memory(const char *reference)
515{
516 /*
517 * Make sure alternates are initialized, or else our entry may be
518 * overwritten when they are.
519 */
520 prepare_alt_odb();
521
dc732bd5 522 link_alt_odb_entries(reference, '\n', NULL, 0);
a5b34d21
JK
523}
524
9eeea7d2
SB
525/*
526 * Compute the exact path an alternate is at and returns it. In case of
527 * error NULL is returned and the human readable error is added to `err`
528 * `path` may be relative and should point to $GITDIR.
529 * `err` must not be null.
530 */
531char *compute_alternate_path(const char *path, struct strbuf *err)
532{
533 char *ref_git = NULL;
534 const char *repo, *ref_git_s;
535 int seen_error = 0;
536
537 ref_git_s = real_path_if_valid(path);
538 if (!ref_git_s) {
539 seen_error = 1;
540 strbuf_addf(err, _("path '%s' does not exist"), path);
541 goto out;
542 } else
543 /*
544 * Beware: read_gitfile(), real_path() and mkpath()
545 * return static buffer
546 */
547 ref_git = xstrdup(ref_git_s);
548
549 repo = read_gitfile(ref_git);
550 if (!repo)
551 repo = read_gitfile(mkpath("%s/.git", ref_git));
552 if (repo) {
553 free(ref_git);
554 ref_git = xstrdup(repo);
555 }
556
557 if (!repo && is_directory(mkpath("%s/.git/objects", ref_git))) {
558 char *ref_git_git = mkpathdup("%s/.git", ref_git);
559 free(ref_git);
560 ref_git = ref_git_git;
561 } else if (!is_directory(mkpath("%s/objects", ref_git))) {
562 struct strbuf sb = STRBUF_INIT;
563 seen_error = 1;
564 if (get_common_dir(&sb, ref_git)) {
565 strbuf_addf(err,
566 _("reference repository '%s' as a linked "
567 "checkout is not supported yet."),
568 path);
569 goto out;
570 }
571
572 strbuf_addf(err, _("reference repository '%s' is not a "
573 "local repository."), path);
574 goto out;
575 }
576
577 if (!access(mkpath("%s/shallow", ref_git), F_OK)) {
578 strbuf_addf(err, _("reference repository '%s' is shallow"),
579 path);
580 seen_error = 1;
581 goto out;
582 }
583
584 if (!access(mkpath("%s/info/grafts", ref_git), F_OK)) {
585 strbuf_addf(err,
586 _("reference repository '%s' is grafted"),
587 path);
588 seen_error = 1;
589 goto out;
590 }
591
592out:
593 if (seen_error) {
6a83d902 594 FREE_AND_NULL(ref_git);
9eeea7d2
SB
595 }
596
597 return ref_git;
598}
599
fe1b2268 600int foreach_alt_odb(alt_odb_fn fn, void *cb)
d79796bc
JH
601{
602 struct alternate_object_database *ent;
fe1b2268 603 int r = 0;
d79796bc
JH
604
605 prepare_alt_odb();
fe1b2268
JK
606 for (ent = alt_odb_list; ent; ent = ent->next) {
607 r = fn(ent, cb);
608 if (r)
609 break;
610 }
611 return r;
d79796bc
JH
612}
613
c2f493a4
MW
614void prepare_alt_odb(void)
615{
554fe20d 616 const char *alt;
c2f493a4 617
7dc24aa5
SP
618 if (alt_odb_tail)
619 return;
620
c2f493a4 621 alt = getenv(ALTERNATE_DB_ENVIRONMENT);
c2f493a4 622
c2f493a4 623 alt_odb_tail = &alt_odb_list;
dc732bd5 624 link_alt_odb_entries(alt, PATH_SEP, NULL, 0);
c2f493a4
MW
625
626 read_info_alternates(get_object_directory(), 0);
627}
628
3096b2ec 629/* Returns 1 if we have successfully freshened the file, 0 otherwise. */
33d4221c 630static int freshen_file(const char *fn)
ace1534d 631{
33d4221c
JK
632 struct utimbuf t;
633 t.actime = t.modtime = time(NULL);
634 return !utime(fn, &t);
0f4dc14a 635}
ace1534d 636
3096b2ec
JK
637/*
638 * All of the check_and_freshen functions return 1 if the file exists and was
639 * freshened (if freshening was requested), 0 otherwise. If they return
640 * 0, you should not assume that it is safe to skip a write of the object (it
641 * either does not exist on disk, or has a stale mtime and may be subject to
642 * pruning).
643 */
6a5e6f5e 644int check_and_freshen_file(const char *fn, int freshen)
33d4221c
JK
645{
646 if (access(fn, F_OK))
647 return 0;
3096b2ec 648 if (freshen && !freshen_file(fn))
33d4221c
JK
649 return 0;
650 return 1;
651}
652
653static int check_and_freshen_local(const unsigned char *sha1, int freshen)
654{
655 return check_and_freshen_file(sha1_file_name(sha1), freshen);
656}
657
658static int check_and_freshen_nonlocal(const unsigned char *sha1, int freshen)
0f4dc14a
BC
659{
660 struct alternate_object_database *alt;
9a217f2a 661 prepare_alt_odb();
d5a63b99 662 for (alt = alt_odb_list; alt; alt = alt->next) {
29ec6af2
JK
663 const char *path = alt_sha1_path(alt, sha1);
664 if (check_and_freshen_file(path, freshen))
c529d75a 665 return 1;
ace1534d 666 }
c529d75a 667 return 0;
ace1534d
JH
668}
669
33d4221c
JK
670static int check_and_freshen(const unsigned char *sha1, int freshen)
671{
672 return check_and_freshen_local(sha1, freshen) ||
673 check_and_freshen_nonlocal(sha1, freshen);
674}
675
676int has_loose_object_nonlocal(const unsigned char *sha1)
677{
678 return check_and_freshen_nonlocal(sha1, 0);
679}
680
0f4dc14a
BC
681static int has_loose_object(const unsigned char *sha1)
682{
33d4221c 683 return check_and_freshen(sha1, 0);
0f4dc14a
BC
684}
685
02710228
SP
686static void mmap_limit_check(size_t length)
687{
688 static size_t limit = 0;
689 if (!limit) {
690 limit = git_env_ulong("GIT_MMAP_LIMIT", 0);
691 if (!limit)
692 limit = SIZE_MAX;
693 }
694 if (length > limit)
695 die("attempting to mmap %"PRIuMAX" over limit %"PRIuMAX,
696 (uintmax_t)length, (uintmax_t)limit);
697}
698
1570856b
JK
699void *xmmap_gently(void *start, size_t length,
700 int prot, int flags, int fd, off_t offset)
58ecbd5e 701{
02710228
SP
702 void *ret;
703
704 mmap_limit_check(length);
705 ret = mmap(start, length, prot, flags, fd, offset);
58ecbd5e
JN
706 if (ret == MAP_FAILED) {
707 if (!length)
708 return NULL;
7c3ecb32 709 release_pack_memory(length);
58ecbd5e 710 ret = mmap(start, length, prot, flags, fd, offset);
58ecbd5e
JN
711 }
712 return ret;
713}
714
1570856b
JK
715void *xmmap(void *start, size_t length,
716 int prot, int flags, int fd, off_t offset)
717{
718 void *ret = xmmap_gently(start, length, prot, flags, fd, offset);
719 if (ret == MAP_FAILED)
9ca0aaf6 720 die_errno("mmap failed");
1570856b
JK
721 return ret;
722}
723
88d0db55 724/*
090ea126
NTND
725 * With an in-core object data in "map", rehash it to make sure the
726 * object name actually matches "sha1" to detect object corruption.
727 * With "map" == NULL, try reading the object named with "sha1" using
728 * the streaming interface and rehash it to do the same.
88d0db55 729 */
090ea126
NTND
730int check_sha1_signature(const unsigned char *sha1, void *map,
731 unsigned long size, const char *type)
88d0db55 732{
0fcfd160 733 unsigned char real_sha1[20];
090ea126
NTND
734 enum object_type obj_type;
735 struct git_istream *st;
736 git_SHA_CTX c;
737 char hdr[32];
738 int hdrlen;
88d0db55 739
090ea126
NTND
740 if (map) {
741 hash_sha1_file(map, size, type, real_sha1);
742 return hashcmp(sha1, real_sha1) ? -1 : 0;
88d0db55
BC
743 }
744
090ea126
NTND
745 st = open_istream(sha1, &obj_type, &size, NULL);
746 if (!st)
747 return -1;
88d0db55 748
090ea126 749 /* Generate the header */
ef1286d3 750 hdrlen = xsnprintf(hdr, sizeof(hdr), "%s %lu", typename(obj_type), size) + 1;
88d0db55 751
090ea126
NTND
752 /* Sha1.. */
753 git_SHA1_Init(&c);
754 git_SHA1_Update(&c, hdr, hdrlen);
755 for (;;) {
756 char buf[1024 * 16];
757 ssize_t readlen = read_istream(st, buf, sizeof(buf));
1f688557 758
f54fac53
JK
759 if (readlen < 0) {
760 close_istream(st);
761 return -1;
762 }
090ea126
NTND
763 if (!readlen)
764 break;
765 git_SHA1_Update(&c, buf, readlen);
fa5fc15d 766 }
090ea126
NTND
767 git_SHA1_Final(real_sha1, &c);
768 close_istream(st);
a89fccd2 769 return hashcmp(sha1, real_sha1) ? -1 : 0;
fa5fc15d
SP
770}
771
1b8ac5ea 772int git_open_cloexec(const char *name, int flags)
a0788266 773{
1e3001a8
JH
774 int fd;
775 static int o_cloexec = O_CLOEXEC;
a0788266 776
1e3001a8
JH
777 fd = open(name, flags | o_cloexec);
778 if ((o_cloexec & O_CLOEXEC) && fd < 0 && errno == EINVAL) {
cd66ada0 779 /* Try again w/o O_CLOEXEC: the kernel might not support it */
1e3001a8
JH
780 o_cloexec &= ~O_CLOEXEC;
781 fd = open(name, flags | o_cloexec);
491a8dec 782 }
491a8dec 783
9fb9495d 784#if defined(F_GETFD) && defined(F_SETFD) && defined(FD_CLOEXEC)
491a8dec 785 {
1e3001a8 786 static int fd_cloexec = FD_CLOEXEC;
a0788266 787
1e3001a8
JH
788 if (!o_cloexec && 0 <= fd && fd_cloexec) {
789 /* Opened w/o O_CLOEXEC? try with fcntl(2) to add it */
9fb9495d
EW
790 int flags = fcntl(fd, F_GETFD);
791 if (fcntl(fd, F_SETFD, flags | fd_cloexec))
1e3001a8 792 fd_cloexec = 0;
cd66ada0 793 }
44d1c19e 794 }
a0788266 795#endif
1b8ac5ea 796 return fd;
a0788266
JS
797}
798
3cf8b462 799/*
771e7d57
JK
800 * Find "sha1" as a loose object in the local repository or in an alternate.
801 * Returns 0 on success, negative on failure.
802 *
803 * The "path" out-parameter will give the path of the object we found (if any).
804 * Note that it may point to static storage and is only valid until another
805 * call to sha1_file_name(), etc.
3cf8b462 806 */
771e7d57
JK
807static int stat_sha1_file(const unsigned char *sha1, struct stat *st,
808 const char **path)
1f688557 809{
052fe5ea 810 struct alternate_object_database *alt;
d079837e 811
771e7d57
JK
812 *path = sha1_file_name(sha1);
813 if (!lstat(*path, st))
052fe5ea 814 return 0;
c7934306 815
052fe5ea
JK
816 prepare_alt_odb();
817 errno = ENOENT;
818 for (alt = alt_odb_list; alt; alt = alt->next) {
771e7d57
JK
819 *path = alt_sha1_path(alt, sha1);
820 if (!lstat(*path, st))
052fe5ea 821 return 0;
c7934306
SP
822 }
823
3cf8b462
SP
824 return -1;
825}
826
771e7d57
JK
827/*
828 * Like stat_sha1_file(), but actually open the object and return the
829 * descriptor. See the caveats on the "path" parameter above.
830 */
831static int open_sha1_file(const unsigned char *sha1, const char **path)
60bb8b14 832{
44d1c19e 833 int fd;
44d1c19e 834 struct alternate_object_database *alt;
d6c8a05b 835 int most_interesting_errno;
60bb8b14 836
771e7d57
JK
837 *path = sha1_file_name(sha1);
838 fd = git_open(*path);
44d1c19e
LT
839 if (fd >= 0)
840 return fd;
d6c8a05b 841 most_interesting_errno = errno;
03e79c88 842
44d1c19e 843 prepare_alt_odb();
44d1c19e 844 for (alt = alt_odb_list; alt; alt = alt->next) {
771e7d57
JK
845 *path = alt_sha1_path(alt, sha1);
846 fd = git_open(*path);
44d1c19e
LT
847 if (fd >= 0)
848 return fd;
d6c8a05b
JK
849 if (most_interesting_errno == ENOENT)
850 most_interesting_errno = errno;
03e79c88 851 }
d6c8a05b 852 errno = most_interesting_errno;
44d1c19e 853 return -1;
1f688557
JH
854}
855
f6371f92
JK
856/*
857 * Map the loose object at "path" if it is not NULL, or the path found by
858 * searching for a loose object named "sha1".
859 */
860static void *map_sha1_file_1(const char *path,
861 const unsigned char *sha1,
862 unsigned long *size)
27d69a46 863{
0fcfd160 864 void *map;
144bde78 865 int fd;
84dd81c1 866
f6371f92
JK
867 if (path)
868 fd = git_open(path);
8261e1f1 869 else
f6371f92 870 fd = open_sha1_file(sha1, &path);
44d1c19e
LT
871 map = NULL;
872 if (fd >= 0) {
873 struct stat st;
1f688557 874
44d1c19e
LT
875 if (!fstat(fd, &st)) {
876 *size = xsize_t(st.st_size);
33e42de0
MM
877 if (!*size) {
878 /* mmap() is forbidden on empty files */
771e7d57 879 error("object file %s is empty", path);
33e42de0
MM
880 return NULL;
881 }
44d1c19e 882 map = xmmap(NULL, *size, PROT_READ, MAP_PRIVATE, fd, 0);
144bde78 883 }
44d1c19e 884 close(fd);
74e34e1f 885 }
0fcfd160 886 return map;
74e34e1f
NP
887}
888
f6371f92 889void *map_sha1_file(const unsigned char *sha1, unsigned long *size)
068f85e3 890{
f6371f92 891 return map_sha1_file_1(NULL, sha1, size);
068f85e3 892}
893
d21f8426
JH
894static int unpack_sha1_short_header(git_zstream *stream,
895 unsigned char *map, unsigned long mapsize,
896 void *buffer, unsigned long bufsiz)
47fe3f6e 897{
c4483576
LT
898 /* Get the data stream */
899 memset(stream, 0, sizeof(*stream));
900 stream->next_in = map;
901 stream->avail_in = mapsize;
902 stream->next_out = buffer;
93821bd9 903 stream->avail_out = bufsiz;
47fe3f6e 904
39c68542 905 git_inflate_init(stream);
cc5c54e7 906 return git_inflate(stream, 0);
9a217f2a
JH
907}
908
d21f8426
JH
909int unpack_sha1_header(git_zstream *stream,
910 unsigned char *map, unsigned long mapsize,
911 void *buffer, unsigned long bufsiz)
1f688557 912{
d21f8426
JH
913 int status = unpack_sha1_short_header(stream, map, mapsize,
914 buffer, bufsiz);
42873078 915
d21f8426
JH
916 if (status < Z_OK)
917 return status;
628522ec 918
d21f8426
JH
919 /* Make sure we have the terminating NUL */
920 if (!memchr(buffer, '\0', stream->next_out - (unsigned char *)buffer))
921 return -1;
1f688557
JH
922 return 0;
923}
924
46f03448
KN
925static int unpack_sha1_header_to_strbuf(git_zstream *stream, unsigned char *map,
926 unsigned long mapsize, void *buffer,
927 unsigned long bufsiz, struct strbuf *header)
d131b7af 928{
46f03448
KN
929 int status;
930
d21f8426
JH
931 status = unpack_sha1_short_header(stream, map, mapsize, buffer, bufsiz);
932 if (status < Z_OK)
933 return -1;
d131b7af 934
46f03448
KN
935 /*
936 * Check if entire header is unpacked in the first iteration.
d131b7af 937 */
46f03448
KN
938 if (memchr(buffer, '\0', stream->next_out - (unsigned char *)buffer))
939 return 0;
d131b7af 940
46f03448
KN
941 /*
942 * buffer[0..bufsiz] was not large enough. Copy the partial
943 * result out to header, and then append the result of further
944 * reading the stream.
945 */
946 strbuf_add(header, buffer, stream->next_out - (unsigned char *)buffer);
947 stream->next_out = buffer;
948 stream->avail_out = bufsiz;
d131b7af 949
46f03448
KN
950 do {
951 status = git_inflate(stream, 0);
952 strbuf_add(header, buffer, stream->next_out - (unsigned char *)buffer);
953 if (memchr(buffer, '\0', stream->next_out - (unsigned char *)buffer))
954 return 0;
955 stream->next_out = buffer;
956 stream->avail_out = bufsiz;
957 } while (status != Z_STREAM_END);
958 return -1;
d131b7af
SP
959}
960
ef49a7a0 961static void *unpack_sha1_rest(git_zstream *stream, void *buffer, unsigned long size, const unsigned char *sha1)
95099731 962{
5180cacc 963 int bytes = strlen(buffer) + 1;
3aee68aa 964 unsigned char *buf = xmallocz(size);
93821bd9 965 unsigned long n;
7efbff75 966 int status = Z_OK;
95099731 967
93821bd9
LT
968 n = stream->total_out - bytes;
969 if (n > size)
970 n = size;
971 memcpy(buf, (char *) buffer + bytes, n);
972 bytes = n;
456cdf6e
LT
973 if (bytes <= size) {
974 /*
975 * The above condition must be (bytes <= size), not
976 * (bytes < size). In other words, even though we
ccf5ace0 977 * expect no more output and set avail_out to zero,
456cdf6e
LT
978 * the input zlib stream may have bytes that express
979 * "this concludes the stream", and we *do* want to
980 * eat that input.
981 *
982 * Otherwise we would not be able to test that we
983 * consumed all the input to reach the expected size;
984 * we also want to check that zlib tells us that all
985 * went well with status == Z_STREAM_END at the end.
986 */
5180cacc
LT
987 stream->next_out = buf + bytes;
988 stream->avail_out = size - bytes;
7efbff75 989 while (status == Z_OK)
39c68542 990 status = git_inflate(stream, Z_FINISH);
5180cacc 991 }
456cdf6e 992 if (status == Z_STREAM_END && !stream->avail_in) {
39c68542 993 git_inflate_end(stream);
7efbff75 994 return buf;
95099731
NTND
995 }
996
7efbff75
JH
997 if (status < 0)
998 error("corrupt loose object '%s'", sha1_to_hex(sha1));
999 else if (stream->avail_in)
1000 error("garbage at end of loose object '%s'",
1001 sha1_to_hex(sha1));
1002 free(buf);
1003 return NULL;
95099731
NTND
1004}
1005
d40d535b 1006/*
5180cacc
LT
1007 * We used to just use "sscanf()", but that's actually way
1008 * too permissive for what we want to check. So do an anal
1009 * object header parse by hand.
d40d535b 1010 */
46f03448
KN
1011static int parse_sha1_header_extended(const char *hdr, struct object_info *oi,
1012 unsigned int flags)
1f688557 1013{
46f03448 1014 const char *type_buf = hdr;
5180cacc 1015 unsigned long size;
46f03448 1016 int type, type_len = 0;
43057304 1017
5180cacc 1018 /*
46f03448 1019 * The type can be of any size but is followed by
21666f1a 1020 * a space.
5180cacc 1021 */
5180cacc
LT
1022 for (;;) {
1023 char c = *hdr++;
d21f8426
JH
1024 if (!c)
1025 return -1;
5180cacc
LT
1026 if (c == ' ')
1027 break;
46f03448 1028 type_len++;
5180cacc 1029 }
1f688557 1030
46f03448
KN
1031 type = type_from_string_gently(type_buf, type_len, 1);
1032 if (oi->typename)
1033 strbuf_add(oi->typename, type_buf, type_len);
1034 /*
1035 * Set type to 0 if its an unknown object and
2e3a16b2 1036 * we're obtaining the type using '--allow-unknown-type'
46f03448
KN
1037 * option.
1038 */
19fc5e84 1039 if ((flags & OBJECT_INFO_ALLOW_UNKNOWN_TYPE) && (type < 0))
46f03448
KN
1040 type = 0;
1041 else if (type < 0)
1042 die("invalid object type");
1043 if (oi->typep)
1044 *oi->typep = type;
5180cacc
LT
1045
1046 /*
1047 * The length must follow immediately, and be in canonical
1048 * decimal format (ie "010" is not valid).
1049 */
1050 size = *hdr++ - '0';
1051 if (size > 9)
1052 return -1;
1053 if (size) {
1054 for (;;) {
1055 unsigned long c = *hdr - '0';
1056 if (c > 9)
1057 break;
1058 hdr++;
1059 size = size * 10 + c;
1b1005d1 1060 }
c01f51cc 1061 }
46f03448
KN
1062
1063 if (oi->sizep)
1064 *oi->sizep = size;
5180cacc
LT
1065
1066 /*
1067 * The length must be followed by a zero byte
1068 */
46f03448 1069 return *hdr ? -1 : type;
1f688557
JH
1070}
1071
46f03448 1072int parse_sha1_header(const char *hdr, unsigned long *sizep)
bf592c50 1073{
27b5c1a0 1074 struct object_info oi = OBJECT_INFO_INIT;
21666f1a 1075
46f03448 1076 oi.sizep = sizep;
1f0c0d36 1077 return parse_sha1_header_extended(hdr, &oi, 0);
bf592c50
DB
1078}
1079
052fe5ea 1080static int sha1_loose_object_info(const unsigned char *sha1,
46f03448
KN
1081 struct object_info *oi,
1082 int flags)
65c2e0c3 1083{
46f03448
KN
1084 int status = 0;
1085 unsigned long mapsize;
65c2e0c3 1086 void *map;
ef49a7a0 1087 git_zstream stream;
d65a16f6 1088 char hdr[32];
46f03448 1089 struct strbuf hdrbuf = STRBUF_INIT;
c84a1f3e 1090 unsigned long size_scratch;
65c2e0c3 1091
5d642e75
JK
1092 if (oi->delta_base_sha1)
1093 hashclr(oi->delta_base_sha1);
1094
052fe5ea
JK
1095 /*
1096 * If we don't care about type or size, then we don't
4ef8d1dd
JH
1097 * need to look inside the object at all. Note that we
1098 * do not optimize out the stat call, even if the
1099 * caller doesn't care about the disk-size, since our
1100 * return value implicitly indicates whether the
1101 * object even exists.
052fe5ea 1102 */
c84a1f3e 1103 if (!oi->typep && !oi->typename && !oi->sizep && !oi->contentp) {
771e7d57 1104 const char *path;
4ef8d1dd 1105 struct stat st;
771e7d57 1106 if (stat_sha1_file(sha1, &st, &path) < 0)
4ef8d1dd
JH
1107 return -1;
1108 if (oi->disk_sizep)
23c339c0 1109 *oi->disk_sizep = st.st_size;
052fe5ea
JK
1110 return 0;
1111 }
1112
bb6b8e4f 1113 map = map_sha1_file(sha1, &mapsize);
f0df4ed5 1114 if (!map)
dbea72a8 1115 return -1;
c84a1f3e
JT
1116
1117 if (!oi->sizep)
1118 oi->sizep = &size_scratch;
1119
23c339c0
JK
1120 if (oi->disk_sizep)
1121 *oi->disk_sizep = mapsize;
19fc5e84 1122 if ((flags & OBJECT_INFO_ALLOW_UNKNOWN_TYPE)) {
46f03448
KN
1123 if (unpack_sha1_header_to_strbuf(&stream, map, mapsize, hdr, sizeof(hdr), &hdrbuf) < 0)
1124 status = error("unable to unpack %s header with --allow-unknown-type",
1125 sha1_to_hex(sha1));
1126 } else if (unpack_sha1_header(&stream, map, mapsize, hdr, sizeof(hdr)) < 0)
36e4d74a
JH
1127 status = error("unable to unpack %s header",
1128 sha1_to_hex(sha1));
46f03448
KN
1129 if (status < 0)
1130 ; /* Do nothing */
1131 else if (hdrbuf.len) {
1132 if ((status = parse_sha1_header_extended(hdrbuf.buf, oi, flags)) < 0)
1133 status = error("unable to parse %s header with --allow-unknown-type",
1134 sha1_to_hex(sha1));
1135 } else if ((status = parse_sha1_header_extended(hdr, oi, flags)) < 0)
36e4d74a 1136 status = error("unable to parse %s header", sha1_to_hex(sha1));
c84a1f3e 1137
b3ea7dd3 1138 if (status >= 0 && oi->contentp) {
c84a1f3e
JT
1139 *oi->contentp = unpack_sha1_rest(&stream, hdr,
1140 *oi->sizep, sha1);
b3ea7dd3
JK
1141 if (!*oi->contentp) {
1142 git_inflate_end(&stream);
1143 status = -1;
1144 }
1145 } else
c84a1f3e
JT
1146 git_inflate_end(&stream);
1147
65c2e0c3 1148 munmap(map, mapsize);
46f03448 1149 if (status && oi->typep)
23c339c0 1150 *oi->typep = status;
c84a1f3e
JT
1151 if (oi->sizep == &size_scratch)
1152 oi->sizep = NULL;
46f03448 1153 strbuf_release(&hdrbuf);
3ab0fb06 1154 oi->whence = OI_LOOSE;
93cff9a9 1155 return (status < 0) ? status : 0;
65c2e0c3
JH
1156}
1157
de7b5d62 1158int sha1_object_info_extended(const unsigned char *sha1, struct object_info *oi, unsigned flags)
f0df4ed5 1159{
cd585e2a 1160 static struct object_info blank_oi = OBJECT_INFO_INIT;
f0df4ed5 1161 struct pack_entry e;
5b086407 1162 int rtype;
1f0c0d36
JT
1163 const unsigned char *real = (flags & OBJECT_INFO_LOOKUP_REPLACE) ?
1164 lookup_replace_object(sha1) :
1165 sha1;
f0df4ed5 1166
cd585e2a
JT
1167 if (!oi)
1168 oi = &blank_oi;
1169
dfdd4afc
JT
1170 if (!(flags & OBJECT_INFO_SKIP_CACHED)) {
1171 struct cached_object *co = find_cached_object(real);
1172 if (co) {
1173 if (oi->typep)
1174 *(oi->typep) = co->type;
1175 if (oi->sizep)
1176 *(oi->sizep) = co->size;
1177 if (oi->disk_sizep)
1178 *(oi->disk_sizep) = 0;
1179 if (oi->delta_base_sha1)
1180 hashclr(oi->delta_base_sha1);
1181 if (oi->typename)
1182 strbuf_addstr(oi->typename, typename(co->type));
1183 if (oi->contentp)
1184 *oi->contentp = xmemdupz(co->buf, co->size);
1185 oi->whence = OI_CACHED;
1186 return 0;
1187 }
c4d9986f
NTND
1188 }
1189
1f7117ef 1190 if (!find_pack_entry(real, &e)) {
ddd63e64 1191 /* Most likely it's a loose object. */
3ab0fb06 1192 if (!sha1_loose_object_info(real, oi, flags))
5b086407 1193 return 0;
ddd63e64
SG
1194
1195 /* Not a loose object; someone else may have just packed it. */
dfdd4afc 1196 if (flags & OBJECT_INFO_QUICK) {
052fe5ea 1197 return -1;
dfdd4afc
JT
1198 } else {
1199 reprepare_packed_git();
1200 if (!find_pack_entry(real, &e))
1201 return -1;
1202 }
f0df4ed5 1203 }
3d77d877 1204
cd585e2a
JT
1205 if (oi == &blank_oi)
1206 /*
1207 * We know that the caller doesn't actually need the
1208 * information below, so return early.
1209 */
1210 return 0;
46f03448 1211
23c339c0 1212 rtype = packed_object_info(e.p, e.offset, oi);
412916ee 1213 if (rtype < 0) {
1f7117ef
CC
1214 mark_bad_packed_object(e.p, real);
1215 return sha1_object_info_extended(real, oi, 0);
3ab0fb06 1216 } else if (oi->whence == OI_PACKED) {
9a490590
JH
1217 oi->u.packed.offset = e.offset;
1218 oi->u.packed.pack = e.p;
1219 oi->u.packed.is_delta = (rtype == OBJ_REF_DELTA ||
1220 rtype == OBJ_OFS_DELTA);
3d77d877
NP
1221 }
1222
5b086407 1223 return 0;
f0df4ed5
JS
1224}
1225
3fc0dca9 1226/* returns enum object_type or negative */
9a490590
JH
1227int sha1_object_info(const unsigned char *sha1, unsigned long *sizep)
1228{
5b086407 1229 enum object_type type;
27b5c1a0 1230 struct object_info oi = OBJECT_INFO_INIT;
9a490590 1231
5b086407 1232 oi.typep = &type;
9a490590 1233 oi.sizep = sizep;
1f0c0d36
JT
1234 if (sha1_object_info_extended(sha1, &oi,
1235 OBJECT_INFO_LOOKUP_REPLACE) < 0)
5b086407
JK
1236 return -1;
1237 return type;
9a490590
JH
1238}
1239
f1d8130b
JT
1240static void *read_object(const unsigned char *sha1, enum object_type *type,
1241 unsigned long *size)
1242{
1243 struct object_info oi = OBJECT_INFO_INIT;
1244 void *content;
1245 oi.typep = type;
1246 oi.sizep = size;
1247 oi.contentp = &content;
1248
1249 if (sha1_object_info_extended(sha1, &oi, 0) < 0)
1250 return NULL;
1251 return content;
1252}
1253
21666f1a
NP
1254int pretend_sha1_file(void *buf, unsigned long len, enum object_type type,
1255 unsigned char *sha1)
d66b37bb
JH
1256{
1257 struct cached_object *co;
1258
21666f1a 1259 hash_sha1_file(buf, len, typename(type), sha1);
d66b37bb
JH
1260 if (has_sha1_file(sha1) || find_cached_object(sha1))
1261 return 0;
c7353967 1262 ALLOC_GROW(cached_objects, cached_object_nr + 1, cached_object_alloc);
d66b37bb
JH
1263 co = &cached_objects[cached_object_nr++];
1264 co->size = len;
21666f1a 1265 co->type = type;
efa13f7b
JH
1266 co->buf = xmalloc(len);
1267 memcpy(co->buf, buf, len);
d66b37bb
JH
1268 hashcpy(co->sha1, sha1);
1269 return 0;
1270}
1271
b6c4cecc
JH
1272/*
1273 * This function dies on corrupt objects; the callers who want to
1274 * deal with them should arrange to call read_object() and give error
1275 * messages themselves.
1276 */
5bf29b95
JH
1277void *read_sha1_file_extended(const unsigned char *sha1,
1278 enum object_type *type,
1279 unsigned long *size,
1f0c0d36 1280 int lookup_replace)
ac939109 1281{
3ba7a065 1282 void *data;
b6c4cecc 1283 const struct packed_git *p;
771e7d57
JK
1284 const char *path;
1285 struct stat st;
1f0c0d36
JT
1286 const unsigned char *repl = lookup_replace ? lookup_replace_object(sha1)
1287 : sha1;
b6c4cecc 1288
3ba7a065
JH
1289 errno = 0;
1290 data = read_object(repl, type, size);
4bbf5a26 1291 if (data)
b6c4cecc 1292 return data;
68095570 1293
25f3af3f 1294 if (errno && errno != ENOENT)
3ba7a065
JH
1295 die_errno("failed to read object %s", sha1_to_hex(sha1));
1296
68095570 1297 /* die if we replaced an object with one that does not exist */
b6c4cecc 1298 if (repl != sha1)
68095570
CC
1299 die("replacement %s not found for %s",
1300 sha1_to_hex(repl), sha1_to_hex(sha1));
1301
771e7d57 1302 if (!stat_sha1_file(repl, &st, &path))
b6c4cecc
JH
1303 die("loose object %s (stored in %s) is corrupt",
1304 sha1_to_hex(repl), path);
68095570 1305
b6c4cecc
JH
1306 if ((p = has_packed_and_bad(repl)) != NULL)
1307 die("packed object %s (stored in %s) is corrupt",
1308 sha1_to_hex(repl), p->pack_name);
f5552aee 1309
b6c4cecc 1310 return NULL;
ac939109
NP
1311}
1312
40469ee9 1313void *read_object_with_reference(const unsigned char *sha1,
21666f1a 1314 const char *required_type_name,
40469ee9
JH
1315 unsigned long *size,
1316 unsigned char *actual_sha1_return)
f4913f91 1317{
21666f1a 1318 enum object_type type, required_type;
f4913f91
JH
1319 void *buffer;
1320 unsigned long isize;
40469ee9 1321 unsigned char actual_sha1[20];
f4913f91 1322
21666f1a 1323 required_type = type_from_string(required_type_name);
e702496e 1324 hashcpy(actual_sha1, sha1);
40469ee9
JH
1325 while (1) {
1326 int ref_length = -1;
1327 const char *ref_type = NULL;
f4913f91 1328
21666f1a 1329 buffer = read_sha1_file(actual_sha1, &type, &isize);
40469ee9
JH
1330 if (!buffer)
1331 return NULL;
21666f1a 1332 if (type == required_type) {
40469ee9
JH
1333 *size = isize;
1334 if (actual_sha1_return)
e702496e 1335 hashcpy(actual_sha1_return, actual_sha1);
40469ee9
JH
1336 return buffer;
1337 }
1338 /* Handle references */
21666f1a 1339 else if (type == OBJ_COMMIT)
40469ee9 1340 ref_type = "tree ";
21666f1a 1341 else if (type == OBJ_TAG)
40469ee9
JH
1342 ref_type = "object ";
1343 else {
1344 free(buffer);
1345 return NULL;
1346 }
1347 ref_length = strlen(ref_type);
f4913f91 1348
50974ec9
MK
1349 if (ref_length + 40 > isize ||
1350 memcmp(buffer, ref_type, ref_length) ||
1d7f171c 1351 get_sha1_hex((char *) buffer + ref_length, actual_sha1)) {
40469ee9
JH
1352 free(buffer);
1353 return NULL;
1354 }
1cf58e72 1355 free(buffer);
40469ee9
JH
1356 /* Now we have the ID of the referred-to object in
1357 * actual_sha1. Check again. */
f4913f91 1358 }
f4913f91
JH
1359}
1360
ce9fbf16 1361static void write_sha1_file_prepare(const void *buf, unsigned long len,
972a9155 1362 const char *type, unsigned char *sha1,
d65a16f6 1363 char *hdr, int *hdrlen)
d410c0f5 1364{
9126f009 1365 git_SHA_CTX c;
d410c0f5
JH
1366
1367 /* Generate the header */
ef1286d3 1368 *hdrlen = xsnprintf(hdr, *hdrlen, "%s %lu", type, len)+1;
d410c0f5
JH
1369
1370 /* Sha1.. */
9126f009
NP
1371 git_SHA1_Init(&c);
1372 git_SHA1_Update(&c, hdr, *hdrlen);
1373 git_SHA1_Update(&c, buf, len);
1374 git_SHA1_Final(sha1, &c);
d410c0f5
JH
1375}
1376
230f1322 1377/*
5a688fe4 1378 * Move the just written object into its final resting place.
230f1322 1379 */
cb5add58 1380int finalize_object_file(const char *tmpfile, const char *filename)
230f1322 1381{
e32c0a9c 1382 int ret = 0;
5a688fe4 1383
348df166 1384 if (object_creation_mode == OBJECT_CREATION_USES_RENAMES)
be66a6c4
JS
1385 goto try_rename;
1386 else if (link(tmpfile, filename))
e32c0a9c 1387 ret = errno;
7ebb6fca
LT
1388
1389 /*
1390 * Coda hack - coda doesn't like cross-directory links,
1391 * so we fall back to a rename, which will mean that it
1392 * won't be able to check collisions, but that's not a
1393 * big deal.
1394 *
1395 * The same holds for FAT formatted media.
1396 *
3be1f18e 1397 * When this succeeds, we just return. We have nothing
7ebb6fca
LT
1398 * left to unlink.
1399 */
1400 if (ret && ret != EEXIST) {
be66a6c4 1401 try_rename:
7ebb6fca 1402 if (!rename(tmpfile, filename))
3be1f18e 1403 goto out;
9e48b389 1404 ret = errno;
230f1322 1405 }
691f1a28 1406 unlink_or_warn(tmpfile);
230f1322
LT
1407 if (ret) {
1408 if (ret != EEXIST) {
7616c6ca 1409 return error_errno("unable to write sha1 filename %s", filename);
230f1322
LT
1410 }
1411 /* FIXME!!! Collision check here ? */
1412 }
1413
3be1f18e 1414out:
5256b006 1415 if (adjust_shared_perm(filename))
5a688fe4 1416 return error("unable to set permission to '%s'", filename);
230f1322
LT
1417 return 0;
1418}
1419
4d548150
LT
1420static int write_buffer(int fd, const void *buf, size_t len)
1421{
d34cf19b 1422 if (write_in_full(fd, buf, len) < 0)
7616c6ca 1423 return error_errno("file write error");
4d548150
LT
1424 return 0;
1425}
1426
ce9fbf16 1427int hash_sha1_file(const void *buf, unsigned long len, const char *type,
abdc3fc8
RS
1428 unsigned char *sha1)
1429{
d65a16f6 1430 char hdr[32];
ef1286d3 1431 int hdrlen = sizeof(hdr);
abdc3fc8
RS
1432 write_sha1_file_prepare(buf, len, type, sha1, hdr, &hdrlen);
1433 return 0;
1434}
1435
e9039dd3
LT
1436/* Finalize a file on disk, and close it. */
1437static void close_sha1_file(int fd)
1438{
aafe9fba
LT
1439 if (fsync_object_files)
1440 fsync_or_die(fd, "sha1 file");
e9039dd3 1441 if (close(fd) != 0)
d824cbba 1442 die_errno("error when closing sha1 file");
e9039dd3
LT
1443}
1444
5723fe7e
LT
1445/* Size of directory component, including the ending '/' */
1446static inline int directory_size(const char *filename)
1447{
1448 const char *s = strrchr(filename, '/');
1449 if (!s)
1450 return 0;
1451 return s - filename + 1;
1452}
1453
1454/*
1455 * This creates a temporary file in the same directory as the final
1456 * 'filename'
1457 *
1458 * We want to avoid cross-directory filename renames, because those
1459 * can have problems on various filesystems (FAT, NFS, Coda).
1460 */
d4b3d11a 1461static int create_tmpfile(struct strbuf *tmp, const char *filename)
5723fe7e
LT
1462{
1463 int fd, dirlen = directory_size(filename);
1464
d4b3d11a
JK
1465 strbuf_reset(tmp);
1466 strbuf_add(tmp, filename, dirlen);
1467 strbuf_addstr(tmp, "tmp_obj_XXXXXX");
1468 fd = git_mkstemp_mode(tmp->buf, 0444);
cbacbf4e 1469 if (fd < 0 && dirlen && errno == ENOENT) {
d4b3d11a
JK
1470 /*
1471 * Make sure the directory exists; note that the contents
1472 * of the buffer are undefined after mkstemp returns an
1473 * error, so we have to rewrite the whole buffer from
1474 * scratch.
1475 */
1476 strbuf_reset(tmp);
1477 strbuf_add(tmp, filename, dirlen - 1);
1478 if (mkdir(tmp->buf, 0777) && errno != EEXIST)
b2476a60 1479 return -1;
d4b3d11a 1480 if (adjust_shared_perm(tmp->buf))
5723fe7e
LT
1481 return -1;
1482
1483 /* Try again */
d4b3d11a
JK
1484 strbuf_addstr(tmp, "/tmp_obj_XXXXXX");
1485 fd = git_mkstemp_mode(tmp->buf, 0444);
5723fe7e
LT
1486 }
1487 return fd;
1488}
1489
bbac7311 1490static int write_loose_object(const unsigned char *sha1, char *hdr, int hdrlen,
c00e657d 1491 const void *buf, unsigned long len, time_t mtime)
0fcfd160 1492{
915308b1 1493 int fd, ret;
9892beba 1494 unsigned char compressed[4096];
ef49a7a0 1495 git_zstream stream;
748af44c
NP
1496 git_SHA_CTX c;
1497 unsigned char parano_sha1[20];
d4b3d11a 1498 static struct strbuf tmp_file = STRBUF_INIT;
30d6c6ea 1499 const char *filename = sha1_file_name(sha1);
a44c9a5e 1500
d4b3d11a 1501 fd = create_tmpfile(&tmp_file, filename);
aac17941 1502 if (fd < 0) {
35243577 1503 if (errno == EACCES)
82247e9b 1504 return error("insufficient permission for adding an object to repository database %s", get_object_directory());
916d081b 1505 else
7616c6ca 1506 return error_errno("unable to create temporary file");
aac17941
LT
1507 }
1508
0fcfd160 1509 /* Set it up */
55bb5c91 1510 git_deflate_init(&stream, zlib_compression_level);
0fcfd160 1511 stream.next_out = compressed;
9892beba 1512 stream.avail_out = sizeof(compressed);
748af44c 1513 git_SHA1_Init(&c);
a44c9a5e
LT
1514
1515 /* First header.. */
d65a16f6 1516 stream.next_in = (unsigned char *)hdr;
a44c9a5e 1517 stream.avail_in = hdrlen;
55bb5c91
JH
1518 while (git_deflate(&stream, 0) == Z_OK)
1519 ; /* nothing */
748af44c 1520 git_SHA1_Update(&c, hdr, hdrlen);
a44c9a5e
LT
1521
1522 /* Then the data itself.. */
c00e657d 1523 stream.next_in = (void *)buf;
a44c9a5e 1524 stream.avail_in = len;
9892beba 1525 do {
748af44c 1526 unsigned char *in0 = stream.next_in;
55bb5c91 1527 ret = git_deflate(&stream, Z_FINISH);
748af44c 1528 git_SHA1_Update(&c, in0, stream.next_in - in0);
9892beba
NP
1529 if (write_buffer(fd, compressed, stream.next_out - compressed) < 0)
1530 die("unable to write sha1 file");
1531 stream.next_out = compressed;
1532 stream.avail_out = sizeof(compressed);
1533 } while (ret == Z_OK);
1534
ac54c277
LT
1535 if (ret != Z_STREAM_END)
1536 die("unable to deflate new object %s (%d)", sha1_to_hex(sha1), ret);
55bb5c91 1537 ret = git_deflate_end_gently(&stream);
ac54c277
LT
1538 if (ret != Z_OK)
1539 die("deflateEnd on object %s failed (%d)", sha1_to_hex(sha1), ret);
748af44c
NP
1540 git_SHA1_Final(parano_sha1, &c);
1541 if (hashcmp(sha1, parano_sha1) != 0)
1542 die("confused by unstable object source data for %s", sha1_to_hex(sha1));
ac54c277 1543
e9039dd3 1544 close_sha1_file(fd);
0fcfd160 1545
bbac7311
NP
1546 if (mtime) {
1547 struct utimbuf utb;
1548 utb.actime = mtime;
1549 utb.modtime = mtime;
d4b3d11a 1550 if (utime(tmp_file.buf, &utb) < 0)
7616c6ca 1551 warning_errno("failed utime() on %s", tmp_file.buf);
bbac7311
NP
1552 }
1553
d4b3d11a 1554 return finalize_object_file(tmp_file.buf, filename);
0fcfd160 1555}
8237b185 1556
33d4221c
JK
1557static int freshen_loose_object(const unsigned char *sha1)
1558{
1559 return check_and_freshen(sha1, 1);
1560}
1561
1562static int freshen_packed_object(const unsigned char *sha1)
1563{
1564 struct pack_entry e;
ee1c6c34
JK
1565 if (!find_pack_entry(sha1, &e))
1566 return 0;
1567 if (e.p->freshened)
1568 return 1;
1569 if (!freshen_file(e.p->pack_name))
1570 return 0;
1571 e.p->freshened = 1;
1572 return 1;
33d4221c
JK
1573}
1574
1427a7ff 1575int write_sha1_file(const void *buf, unsigned long len, const char *type, unsigned char *sha1)
bbac7311 1576{
bbac7311 1577 char hdr[32];
ef1286d3 1578 int hdrlen = sizeof(hdr);
bbac7311
NP
1579
1580 /* Normally if we have it in the pack then we do not bother writing
1581 * it out into .git/objects/??/?{38} file.
1582 */
1583 write_sha1_file_prepare(buf, len, type, sha1, hdr, &hdrlen);
b5f52f37 1584 if (freshen_packed_object(sha1) || freshen_loose_object(sha1))
bbac7311
NP
1585 return 0;
1586 return write_loose_object(sha1, hdr, hdrlen, buf, len, 0);
1587}
1588
0c3db67c 1589int hash_sha1_file_literally(const void *buf, unsigned long len, const char *type,
da77611d 1590 struct object_id *oid, unsigned flags)
0c3db67c
ES
1591{
1592 char *header;
1593 int hdrlen, status = 0;
1594
1595 /* type string, SP, %lu of the length plus NUL must fit this */
ef1286d3
JK
1596 hdrlen = strlen(type) + 32;
1597 header = xmalloc(hdrlen);
da77611d 1598 write_sha1_file_prepare(buf, len, type, oid->hash, header, &hdrlen);
0c3db67c
ES
1599
1600 if (!(flags & HASH_WRITE_OBJECT))
1601 goto cleanup;
da77611d 1602 if (freshen_packed_object(oid->hash) || freshen_loose_object(oid->hash))
0c3db67c 1603 goto cleanup;
da77611d 1604 status = write_loose_object(oid->hash, header, hdrlen, buf, len, 0);
0c3db67c
ES
1605
1606cleanup:
1607 free(header);
1608 return status;
1609}
1610
bbac7311
NP
1611int force_object_loose(const unsigned char *sha1, time_t mtime)
1612{
bbac7311
NP
1613 void *buf;
1614 unsigned long len;
1615 enum object_type type;
1616 char hdr[32];
1617 int hdrlen;
1fb23e65 1618 int ret;
bbac7311 1619
c529d75a 1620 if (has_loose_object(sha1))
bbac7311 1621 return 0;
789bf26b 1622 buf = read_object(sha1, &type, &len);
bbac7311
NP
1623 if (!buf)
1624 return error("cannot read sha1_file for %s", sha1_to_hex(sha1));
ef1286d3 1625 hdrlen = xsnprintf(hdr, sizeof(hdr), "%s %lu", typename(type), len) + 1;
1fb23e65
BS
1626 ret = write_loose_object(sha1, hdr, hdrlen, buf, len, mtime);
1627 free(buf);
1628
1629 return ret;
bbac7311
NP
1630}
1631
0eeb077b 1632int has_sha1_file_with_flags(const unsigned char *sha1, int flags)
8237b185 1633{
3e8b7d3c
JN
1634 if (!startup_info->have_repository)
1635 return 0;
e83e71c5
JT
1636 return sha1_object_info_extended(sha1, NULL,
1637 flags | OBJECT_INFO_SKIP_CACHED) >= 0;
b419aa25 1638}
1639
1640int has_object_file(const struct object_id *oid)
1641{
1642 return has_sha1_file(oid->hash);
8237b185 1643}
74400e71 1644
5827a035
JK
1645int has_object_file_with_flags(const struct object_id *oid, int flags)
1646{
1647 return has_sha1_file_with_flags(oid->hash, flags);
1648}
1649
c879daa2
NTND
1650static void check_tree(const void *buf, size_t size)
1651{
1652 struct tree_desc desc;
1653 struct name_entry entry;
1654
1655 init_tree_desc(&desc, buf, size);
1656 while (tree_entry(&desc, &entry))
1657 /* do nothing
1658 * tree_entry() will die() on malformed entries */
1659 ;
1660}
1661
1662static void check_commit(const void *buf, size_t size)
1663{
1664 struct commit c;
1665 memset(&c, 0, sizeof(c));
1666 if (parse_commit_buffer(&c, buf, size))
1667 die("corrupt commit");
1668}
1669
1670static void check_tag(const void *buf, size_t size)
1671{
1672 struct tag t;
1673 memset(&t, 0, sizeof(t));
1674 if (parse_tag_buffer(&t, buf, size))
1675 die("corrupt tag");
1676}
1677
bcd29864 1678static int index_mem(struct object_id *oid, void *buf, size_t size,
c4ce46fc
JH
1679 enum object_type type,
1680 const char *path, unsigned flags)
e7332f96 1681{
6c510bee 1682 int ret, re_allocated = 0;
c4ce46fc 1683 int write_object = flags & HASH_WRITE_OBJECT;
74400e71 1684
7672db20 1685 if (!type)
edaec3fb 1686 type = OBJ_BLOB;
6c510bee
LT
1687
1688 /*
1689 * Convert blobs to git internal format
1690 */
43df4f86 1691 if ((type == OBJ_BLOB) && path) {
f285a2d7 1692 struct strbuf nbuf = STRBUF_INIT;
82b474e0 1693 if (convert_to_git(&the_index, path, buf, size, &nbuf,
9472935d 1694 get_safe_crlf(flags))) {
b315c5c0 1695 buf = strbuf_detach(&nbuf, &size);
6c510bee
LT
1696 re_allocated = 1;
1697 }
1698 }
c4ce46fc 1699 if (flags & HASH_FORMAT_CHECK) {
c879daa2
NTND
1700 if (type == OBJ_TREE)
1701 check_tree(buf, size);
1702 if (type == OBJ_COMMIT)
1703 check_commit(buf, size);
1704 if (type == OBJ_TAG)
1705 check_tag(buf, size);
1706 }
6c510bee 1707
7672db20 1708 if (write_object)
bcd29864 1709 ret = write_sha1_file(buf, size, typename(type), oid->hash);
abdc3fc8 1710 else
bcd29864 1711 ret = hash_sha1_file(buf, size, typename(type), oid->hash);
43df4f86 1712 if (re_allocated)
6c510bee 1713 free(buf);
43df4f86
DP
1714 return ret;
1715}
1716
bcd29864 1717static int index_stream_convert_blob(struct object_id *oid, int fd,
9035d75a
SP
1718 const char *path, unsigned flags)
1719{
1720 int ret;
1721 const int write_object = flags & HASH_WRITE_OBJECT;
1722 struct strbuf sbuf = STRBUF_INIT;
1723
1724 assert(path);
1725 assert(would_convert_to_git_filter_fd(path));
1726
d6c41c20 1727 convert_to_git_filter_fd(&the_index, path, fd, &sbuf,
9472935d 1728 get_safe_crlf(flags));
9035d75a
SP
1729
1730 if (write_object)
1731 ret = write_sha1_file(sbuf.buf, sbuf.len, typename(OBJ_BLOB),
bcd29864 1732 oid->hash);
9035d75a
SP
1733 else
1734 ret = hash_sha1_file(sbuf.buf, sbuf.len, typename(OBJ_BLOB),
bcd29864 1735 oid->hash);
9035d75a
SP
1736 strbuf_release(&sbuf);
1737 return ret;
1738}
1739
bcd29864 1740static int index_pipe(struct object_id *oid, int fd, enum object_type type,
7b41e1e1
JH
1741 const char *path, unsigned flags)
1742{
1743 struct strbuf sbuf = STRBUF_INIT;
1744 int ret;
1745
1746 if (strbuf_read(&sbuf, fd, 4096) >= 0)
bcd29864 1747 ret = index_mem(oid, sbuf.buf, sbuf.len, type, path, flags);
7b41e1e1
JH
1748 else
1749 ret = -1;
1750 strbuf_release(&sbuf);
1751 return ret;
1752}
1753
ea68b0ce
DP
1754#define SMALL_FILE_SIZE (32*1024)
1755
bcd29864 1756static int index_core(struct object_id *oid, int fd, size_t size,
7b41e1e1
JH
1757 enum object_type type, const char *path,
1758 unsigned flags)
43df4f86
DP
1759{
1760 int ret;
43df4f86 1761
7b41e1e1 1762 if (!size) {
bcd29864 1763 ret = index_mem(oid, "", size, type, path, flags);
ea68b0ce
DP
1764 } else if (size <= SMALL_FILE_SIZE) {
1765 char *buf = xmalloc(size);
90dca671
JK
1766 ssize_t read_result = read_in_full(fd, buf, size);
1767 if (read_result < 0)
1768 ret = error_errno("read error while indexing %s",
1769 path ? path : "<unknown>");
1770 else if (read_result != size)
1771 ret = error("short read while indexing %s",
1772 path ? path : "<unknown>");
ea68b0ce 1773 else
bcd29864 1774 ret = index_mem(oid, buf, size, type, path, flags);
ea68b0ce 1775 free(buf);
08bda208 1776 } else {
43df4f86 1777 void *buf = xmmap(NULL, size, PROT_READ, MAP_PRIVATE, fd, 0);
bcd29864 1778 ret = index_mem(oid, buf, size, type, path, flags);
aac17941 1779 munmap(buf, size);
08bda208 1780 }
7b41e1e1
JH
1781 return ret;
1782}
1783
4dd1fbc7 1784/*
568508e7
JH
1785 * This creates one packfile per large blob unless bulk-checkin
1786 * machinery is "plugged".
4dd1fbc7
JH
1787 *
1788 * This also bypasses the usual "convert-to-git" dance, and that is on
1789 * purpose. We could write a streaming version of the converting
1790 * functions and insert that before feeding the data to fast-import
4f22b101
JK
1791 * (or equivalent in-core API described above). However, that is
1792 * somewhat complicated, as we do not know the size of the filter
1793 * result, which we need to know beforehand when writing a git object.
1794 * Since the primary motivation for trying to stream from the working
1795 * tree file and to avoid mmaping it in core is to deal with large
1796 * binary blobs, they generally do not want to get any conversion, and
1797 * callers should avoid this code path when filters are requested.
4dd1fbc7 1798 */
7d5e1dc3 1799static int index_stream(struct object_id *oid, int fd, size_t size,
4dd1fbc7
JH
1800 enum object_type type, const char *path,
1801 unsigned flags)
1802{
7d5e1dc3 1803 return index_bulk_checkin(oid->hash, fd, size, type, path, flags);
4dd1fbc7
JH
1804}
1805
e3506559 1806int index_fd(struct object_id *oid, int fd, struct stat *st,
7b41e1e1
JH
1807 enum object_type type, const char *path, unsigned flags)
1808{
1809 int ret;
7b41e1e1 1810
9079ab7c
SP
1811 /*
1812 * Call xsize_t() only when needed to avoid potentially unnecessary
1813 * die() for large files.
1814 */
9035d75a 1815 if (type == OBJ_BLOB && path && would_convert_to_git_filter_fd(path))
bcd29864 1816 ret = index_stream_convert_blob(oid, fd, path, flags);
9035d75a 1817 else if (!S_ISREG(st->st_mode))
bcd29864 1818 ret = index_pipe(oid, fd, type, path, flags);
9079ab7c 1819 else if (st->st_size <= big_file_threshold || type != OBJ_BLOB ||
82b474e0 1820 (path && would_convert_to_git(&the_index, path)))
bcd29864 1821 ret = index_core(oid, fd, xsize_t(st->st_size), type, path,
9079ab7c 1822 flags);
4dd1fbc7 1823 else
7d5e1dc3 1824 ret = index_stream(oid, fd, xsize_t(st->st_size), type, path,
9079ab7c 1825 flags);
43df4f86 1826 close(fd);
aac17941 1827 return ret;
74400e71 1828}
ec1fcc16 1829
98e019b0 1830int index_path(struct object_id *oid, const char *path, struct stat *st, unsigned flags)
ec1fcc16
JH
1831{
1832 int fd;
b760d3aa 1833 struct strbuf sb = STRBUF_INIT;
ea8e0297 1834 int rc = 0;
ec1fcc16
JH
1835
1836 switch (st->st_mode & S_IFMT) {
1837 case S_IFREG:
1838 fd = open(path, O_RDONLY);
1839 if (fd < 0)
7616c6ca 1840 return error_errno("open(\"%s\")", path);
e3506559 1841 if (index_fd(oid, fd, st, OBJ_BLOB, path, flags) < 0)
ec1fcc16
JH
1842 return error("%s: failed to insert into database",
1843 path);
1844 break;
1845 case S_IFLNK:
7616c6ca
NTND
1846 if (strbuf_readlink(&sb, path, st->st_size))
1847 return error_errno("readlink(\"%s\")", path);
c4ce46fc 1848 if (!(flags & HASH_WRITE_OBJECT))
98e019b0
PO
1849 hash_sha1_file(sb.buf, sb.len, blob_type, oid->hash);
1850 else if (write_sha1_file(sb.buf, sb.len, blob_type, oid->hash))
ea8e0297 1851 rc = error("%s: failed to insert into database", path);
b760d3aa 1852 strbuf_release(&sb);
ec1fcc16 1853 break;
f35a6d3b 1854 case S_IFDIR:
a98e6101 1855 return resolve_gitlink_ref(path, "HEAD", oid);
ec1fcc16
JH
1856 default:
1857 return error("%s: unsupported file type", path);
1858 }
ea8e0297 1859 return rc;
ec1fcc16 1860}
a69e5429
JH
1861
1862int read_pack_header(int fd, struct pack_header *header)
1863{
f48ecd38 1864 if (read_in_full(fd, header, sizeof(*header)) != sizeof(*header))
c697ad14
HO
1865 /* "eof before pack header was fully read" */
1866 return PH_ERROR_EOF;
1867
a69e5429
JH
1868 if (header->hdr_signature != htonl(PACK_SIGNATURE))
1869 /* "protocol error (pack signature mismatch detected)" */
1870 return PH_ERROR_PACK_SIGNATURE;
1871 if (!pack_version_ok(header->hdr_version))
1872 /* "protocol error (pack version unsupported)" */
1873 return PH_ERROR_PROTOCOL;
1874 return 0;
1875}
40d52ff7
JK
1876
1877void assert_sha1_type(const unsigned char *sha1, enum object_type expect)
1878{
1879 enum object_type type = sha1_object_info(sha1, NULL);
1880 if (type < 0)
1881 die("%s is not a valid object", sha1_to_hex(sha1));
1882 if (type != expect)
1883 die("%s is not a valid '%s' object", sha1_to_hex(sha1),
1884 typename(expect));
1885}
27e1e22d 1886
70c49050 1887int for_each_file_in_obj_subdir(unsigned int subdir_nr,
cc817ca3
RS
1888 struct strbuf *path,
1889 each_loose_object_fn obj_cb,
1890 each_loose_cruft_fn cruft_cb,
1891 each_loose_subdir_fn subdir_cb,
1892 void *data)
27e1e22d 1893{
0375f472
RS
1894 size_t origlen, baselen;
1895 DIR *dir;
27e1e22d
JK
1896 struct dirent *de;
1897 int r = 0;
62a24c89 1898 struct object_id oid;
27e1e22d 1899
70c49050
RS
1900 if (subdir_nr > 0xff)
1901 BUG("invalid loose object subdirectory: %x", subdir_nr);
1902
0375f472
RS
1903 origlen = path->len;
1904 strbuf_complete(path, '/');
1905 strbuf_addf(path, "%02x", subdir_nr);
1906 baselen = path->len;
1907
1908 dir = opendir(path->buf);
27e1e22d 1909 if (!dir) {
0375f472
RS
1910 if (errno != ENOENT)
1911 r = error_errno("unable to open %s", path->buf);
1912 strbuf_setlen(path, origlen);
1913 return r;
27e1e22d
JK
1914 }
1915
62a24c89
RS
1916 oid.hash[0] = subdir_nr;
1917
27e1e22d
JK
1918 while ((de = readdir(dir))) {
1919 if (is_dot_or_dotdot(de->d_name))
1920 continue;
1921
1922 strbuf_setlen(path, baselen);
1923 strbuf_addf(path, "/%s", de->d_name);
1924
62a24c89
RS
1925 if (strlen(de->d_name) == GIT_SHA1_HEXSZ - 2 &&
1926 !hex_to_bytes(oid.hash + 1, de->d_name,
1927 GIT_SHA1_RAWSZ - 1)) {
1928 if (obj_cb) {
1929 r = obj_cb(&oid, path->buf, data);
1930 if (r)
1931 break;
27e1e22d 1932 }
62a24c89 1933 continue;
27e1e22d
JK
1934 }
1935
1936 if (cruft_cb) {
1937 r = cruft_cb(de->d_name, path->buf, data);
1938 if (r)
1939 break;
1940 }
1941 }
094c7e63 1942 closedir(dir);
27e1e22d 1943
094c7e63 1944 strbuf_setlen(path, baselen);
27e1e22d
JK
1945 if (!r && subdir_cb)
1946 r = subdir_cb(subdir_nr, path->buf, data);
1947
0375f472
RS
1948 strbuf_setlen(path, origlen);
1949
27e1e22d
JK
1950 return r;
1951}
1952
e6f875e0 1953int for_each_loose_file_in_objdir_buf(struct strbuf *path,
27e1e22d
JK
1954 each_loose_object_fn obj_cb,
1955 each_loose_cruft_fn cruft_cb,
1956 each_loose_subdir_fn subdir_cb,
1957 void *data)
1958{
27e1e22d
JK
1959 int r = 0;
1960 int i;
1961
27e1e22d 1962 for (i = 0; i < 256; i++) {
e6f875e0 1963 r = for_each_file_in_obj_subdir(i, path, obj_cb, cruft_cb,
27e1e22d 1964 subdir_cb, data);
27e1e22d
JK
1965 if (r)
1966 break;
1967 }
1968
e6f875e0
JK
1969 return r;
1970}
1971
1972int for_each_loose_file_in_objdir(const char *path,
1973 each_loose_object_fn obj_cb,
1974 each_loose_cruft_fn cruft_cb,
1975 each_loose_subdir_fn subdir_cb,
1976 void *data)
1977{
1978 struct strbuf buf = STRBUF_INIT;
1979 int r;
1980
1981 strbuf_addstr(&buf, path);
1982 r = for_each_loose_file_in_objdir_buf(&buf, obj_cb, cruft_cb,
1983 subdir_cb, data);
27e1e22d 1984 strbuf_release(&buf);
e6f875e0 1985
27e1e22d
JK
1986 return r;
1987}
660c889e
JK
1988
1989struct loose_alt_odb_data {
1990 each_loose_object_fn *cb;
1991 void *data;
1992};
1993
1994static int loose_from_alt_odb(struct alternate_object_database *alt,
1995 void *vdata)
1996{
1997 struct loose_alt_odb_data *data = vdata;
b0a42642
JM
1998 struct strbuf buf = STRBUF_INIT;
1999 int r;
2000
597f9134 2001 strbuf_addstr(&buf, alt->path);
b0a42642
JM
2002 r = for_each_loose_file_in_objdir_buf(&buf,
2003 data->cb, NULL, NULL,
2004 data->data);
2005 strbuf_release(&buf);
2006 return r;
660c889e
JK
2007}
2008
1385bb7b 2009int for_each_loose_object(each_loose_object_fn cb, void *data, unsigned flags)
660c889e
JK
2010{
2011 struct loose_alt_odb_data alt;
2012 int r;
2013
2014 r = for_each_loose_file_in_objdir(get_object_directory(),
2015 cb, NULL, NULL, data);
2016 if (r)
2017 return r;
2018
1385bb7b
JK
2019 if (flags & FOR_EACH_OBJECT_LOCAL_ONLY)
2020 return 0;
2021
660c889e
JK
2022 alt.cb = cb;
2023 alt.data = data;
2024 return foreach_alt_odb(loose_from_alt_odb, &alt);
2025}
2026
f6371f92
JK
2027static int check_stream_sha1(git_zstream *stream,
2028 const char *hdr,
2029 unsigned long size,
2030 const char *path,
2031 const unsigned char *expected_sha1)
2032{
2033 git_SHA_CTX c;
cd02599c 2034 unsigned char real_sha1[GIT_MAX_RAWSZ];
f6371f92
JK
2035 unsigned char buf[4096];
2036 unsigned long total_read;
2037 int status = Z_OK;
2038
2039 git_SHA1_Init(&c);
2040 git_SHA1_Update(&c, hdr, stream->total_out);
2041
2042 /*
2043 * We already read some bytes into hdr, but the ones up to the NUL
2044 * do not count against the object's content size.
2045 */
2046 total_read = stream->total_out - strlen(hdr) - 1;
2047
2048 /*
2049 * This size comparison must be "<=" to read the final zlib packets;
2050 * see the comment in unpack_sha1_rest for details.
2051 */
2052 while (total_read <= size &&
2053 (status == Z_OK || status == Z_BUF_ERROR)) {
2054 stream->next_out = buf;
2055 stream->avail_out = sizeof(buf);
2056 if (size - total_read < stream->avail_out)
2057 stream->avail_out = size - total_read;
2058 status = git_inflate(stream, Z_FINISH);
2059 git_SHA1_Update(&c, buf, stream->next_out - buf);
2060 total_read += stream->next_out - buf;
2061 }
2062 git_inflate_end(stream);
2063
2064 if (status != Z_STREAM_END) {
2065 error("corrupt loose object '%s'", sha1_to_hex(expected_sha1));
2066 return -1;
2067 }
cce044df
JK
2068 if (stream->avail_in) {
2069 error("garbage at end of loose object '%s'",
2070 sha1_to_hex(expected_sha1));
2071 return -1;
2072 }
f6371f92
JK
2073
2074 git_SHA1_Final(real_sha1, &c);
2075 if (hashcmp(expected_sha1, real_sha1)) {
2076 error("sha1 mismatch for %s (expected %s)", path,
2077 sha1_to_hex(expected_sha1));
2078 return -1;
2079 }
2080
2081 return 0;
2082}
2083
2084int read_loose_object(const char *path,
2085 const unsigned char *expected_sha1,
2086 enum object_type *type,
2087 unsigned long *size,
2088 void **contents)
2089{
2090 int ret = -1;
f6371f92
JK
2091 void *map = NULL;
2092 unsigned long mapsize;
2093 git_zstream stream;
2094 char hdr[32];
2095
2096 *contents = NULL;
2097
2098 map = map_sha1_file_1(path, NULL, &mapsize);
2099 if (!map) {
2100 error_errno("unable to mmap %s", path);
2101 goto out;
2102 }
2103
2104 if (unpack_sha1_header(&stream, map, mapsize, hdr, sizeof(hdr)) < 0) {
2105 error("unable to unpack header of %s", path);
2106 goto out;
2107 }
2108
2109 *type = parse_sha1_header(hdr, size);
2110 if (*type < 0) {
2111 error("unable to parse header of %s", path);
2112 git_inflate_end(&stream);
2113 goto out;
2114 }
2115
2116 if (*type == OBJ_BLOB) {
2117 if (check_stream_sha1(&stream, hdr, *size, path, expected_sha1) < 0)
2118 goto out;
2119 } else {
2120 *contents = unpack_sha1_rest(&stream, hdr, *size, expected_sha1);
2121 if (!*contents) {
2122 error("unable to unpack contents of %s", path);
2123 git_inflate_end(&stream);
2124 goto out;
2125 }
2126 if (check_sha1_signature(expected_sha1, *contents,
2127 *size, typename(*type))) {
2128 error("sha1 mismatch for %s (expected %s)", path,
2129 sha1_to_hex(expected_sha1));
2130 free(*contents);
2131 goto out;
2132 }
2133 }
2134
2135 ret = 0; /* everything checks out */
2136
2137out:
2138 if (map)
2139 munmap(map, mapsize);
f6371f92
JK
2140 return ret;
2141}