sha1_file: add repository argument to prepare_alt_odb
[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"
090ea126 26#include "streaming.h"
543c5caa 27#include "dir.h"
12d95ef6 28#include "list.h"
c4c6effa 29#include "mergesort.h"
cf3c6352 30#include "quote.h"
4f39cd82 31#include "packfile.h"
8b4c0103 32#include "fetch-object.h"
90c62155 33#include "object-store.h"
e05db0fd 34
50c5cd58 35const unsigned char null_sha1[GIT_MAX_RAWSZ];
3e56e724 36const struct object_id null_oid;
8576fde6
JK
37const struct object_id empty_tree_oid = {
38 EMPTY_TREE_SHA1_BIN_LITERAL
39};
40const struct object_id empty_blob_oid = {
41 EMPTY_BLOB_SHA1_BIN_LITERAL
42};
88cd621d 43
f50e766b 44static void git_hash_sha1_init(void *ctx)
45{
46 git_SHA1_Init((git_SHA_CTX *)ctx);
47}
48
49static void git_hash_sha1_update(void *ctx, const void *data, size_t len)
50{
51 git_SHA1_Update((git_SHA_CTX *)ctx, data, len);
52}
53
54static void git_hash_sha1_final(unsigned char *hash, void *ctx)
55{
56 git_SHA1_Final(hash, (git_SHA_CTX *)ctx);
57}
58
59static void git_hash_unknown_init(void *ctx)
60{
61 die("trying to init unknown hash");
62}
63
64static void git_hash_unknown_update(void *ctx, const void *data, size_t len)
65{
66 die("trying to update unknown hash");
67}
68
69static void git_hash_unknown_final(unsigned char *hash, void *ctx)
70{
71 die("trying to finalize unknown hash");
72}
73
74const struct git_hash_algo hash_algos[GIT_HASH_NALGOS] = {
75 {
76 NULL,
77 0x00000000,
78 0,
79 0,
80 0,
81 git_hash_unknown_init,
82 git_hash_unknown_update,
83 git_hash_unknown_final,
84 NULL,
85 NULL,
86 },
87 {
88 "sha-1",
89 /* "sha1", big-endian */
90 0x73686131,
91 sizeof(git_SHA_CTX),
92 GIT_SHA1_RAWSZ,
93 GIT_SHA1_HEXSZ,
94 git_hash_sha1_init,
95 git_hash_sha1_update,
96 git_hash_sha1_final,
97 &empty_tree_oid,
98 &empty_blob_oid,
99 },
100};
101
c597ba80
NTND
102/*
103 * This is meant to hold a *small* number of objects that you would
104 * want read_sha1_file() to be able to return, but yet you do not want
105 * to write them into the object store (e.g. a browse-only
106 * application).
107 */
108static struct cached_object {
109 unsigned char sha1[20];
110 enum object_type type;
111 void *buf;
112 unsigned long size;
113} *cached_objects;
114static int cached_object_nr, cached_object_alloc;
115
116static struct cached_object empty_tree = {
dab0d410 117 EMPTY_TREE_SHA1_BIN_LITERAL,
c597ba80
NTND
118 OBJ_TREE,
119 "",
120 0
121};
122
123static struct cached_object *find_cached_object(const unsigned char *sha1)
124{
125 int i;
126 struct cached_object *co = cached_objects;
127
128 for (i = 0; i < cached_object_nr; i++, co++) {
129 if (!hashcmp(co->sha1, sha1))
130 return co;
131 }
132 if (!hashcmp(sha1, empty_tree.sha1))
133 return &empty_tree;
134 return NULL;
135}
136
9472935d 137
8462ff43 138static int get_conv_flags(unsigned flags)
9472935d
TB
139{
140 if (flags & HASH_RENORMALIZE)
8462ff43 141 return CONV_EOL_RENORMALIZE;
9472935d 142 else if (flags & HASH_WRITE_OBJECT)
8462ff43 143 return global_conv_flags_eol;
9472935d 144 else
8462ff43 145 return 0;
9472935d
TB
146}
147
148
90a6464b
JH
149int mkdir_in_gitdir(const char *path)
150{
151 if (mkdir(path, 0777)) {
152 int saved_errno = errno;
153 struct stat st;
154 struct strbuf sb = STRBUF_INIT;
155
156 if (errno != EEXIST)
157 return -1;
158 /*
159 * Are we looking at a path in a symlinked worktree
160 * whose original repository does not yet have it?
161 * e.g. .git/rr-cache pointing at its original
162 * repository in which the user hasn't performed any
163 * conflict resolution yet?
164 */
165 if (lstat(path, &st) || !S_ISLNK(st.st_mode) ||
166 strbuf_readlink(&sb, path, st.st_size) ||
167 !is_absolute_path(sb.buf) ||
168 mkdir(sb.buf, 0777)) {
169 strbuf_release(&sb);
170 errno = saved_errno;
171 return -1;
172 }
173 strbuf_release(&sb);
174 }
175 return adjust_shared_perm(path);
176}
177
0be0521b 178enum scld_error safe_create_leading_directories(char *path)
b2cb9425 179{
26c8ae2a 180 char *next_component = path + offset_1st_component(path);
0be0521b 181 enum scld_error ret = SCLD_OK;
67d42212 182
0be0521b 183 while (ret == SCLD_OK && next_component) {
f0502332 184 struct stat st;
0f527403 185 char *slash = next_component, slash_character;
f0502332 186
0f527403
MH
187 while (*slash && !is_dir_sep(*slash))
188 slash++;
189
190 if (!*slash)
b2cb9425 191 break;
bf10cf70 192
26c8ae2a 193 next_component = slash + 1;
0f527403 194 while (is_dir_sep(*next_component))
bf10cf70 195 next_component++;
26c8ae2a 196 if (!*next_component)
5f0bdf50 197 break;
831651fd 198
0f527403 199 slash_character = *slash;
831651fd 200 *slash = '\0';
67d42212
JR
201 if (!stat(path, &st)) {
202 /* path exists */
204a047f
MH
203 if (!S_ISDIR(st.st_mode)) {
204 errno = ENOTDIR;
0be0521b 205 ret = SCLD_EXISTS;
204a047f 206 }
53a39721 207 } else if (mkdir(path, 0777)) {
928734d9 208 if (errno == EEXIST &&
9e6f885d 209 !stat(path, &st) && S_ISDIR(st.st_mode))
928734d9 210 ; /* somebody created it since we checked */
18d37e86
MH
211 else if (errno == ENOENT)
212 /*
213 * Either mkdir() failed because
214 * somebody just pruned the containing
215 * directory, or stat() failed because
216 * the file that was in our way was
217 * just removed. Either way, inform
218 * the caller that it might be worth
219 * trying again:
220 */
221 ret = SCLD_VANISHED;
9e6f885d 222 else
0be0521b 223 ret = SCLD_FAILED;
53a39721 224 } else if (adjust_shared_perm(path)) {
0be0521b 225 ret = SCLD_PERMS;
457f06d6 226 }
0f527403 227 *slash = slash_character;
b2cb9425 228 }
9e6f885d 229 return ret;
b2cb9425 230}
723c31fe 231
0be0521b 232enum scld_error safe_create_leading_directories_const(const char *path)
8e21d63b 233{
02944307 234 int save_errno;
8e21d63b
JK
235 /* path points to cache entries, so xstrdup before messing with it */
236 char *buf = xstrdup(path);
0be0521b 237 enum scld_error result = safe_create_leading_directories(buf);
02944307
MH
238
239 save_errno = errno;
8e21d63b 240 free(buf);
02944307 241 errno = save_errno;
8e21d63b
JK
242 return result;
243}
244
177978f5
MH
245int raceproof_create_file(const char *path, create_file_fn fn, void *cb)
246{
247 /*
248 * The number of times we will try to remove empty directories
249 * in the way of path. This is only 1 because if another
250 * process is racily creating directories that conflict with
251 * us, we don't want to fight against them.
252 */
253 int remove_directories_remaining = 1;
254
255 /*
256 * The number of times that we will try to create the
257 * directories containing path. We are willing to attempt this
258 * more than once, because another process could be trying to
259 * clean up empty directories at the same time as we are
260 * trying to create them.
261 */
262 int create_directories_remaining = 3;
263
264 /* A scratch copy of path, filled lazily if we need it: */
265 struct strbuf path_copy = STRBUF_INIT;
266
267 int ret, save_errno;
268
269 /* Sanity check: */
270 assert(*path);
271
272retry_fn:
273 ret = fn(path, cb);
274 save_errno = errno;
275 if (!ret)
276 goto out;
277
278 if (errno == EISDIR && remove_directories_remaining-- > 0) {
279 /*
280 * A directory is in the way. Maybe it is empty; try
281 * to remove it:
282 */
283 if (!path_copy.len)
284 strbuf_addstr(&path_copy, path);
285
286 if (!remove_dir_recursively(&path_copy, REMOVE_DIR_EMPTY_ONLY))
287 goto retry_fn;
288 } else if (errno == ENOENT && create_directories_remaining-- > 0) {
289 /*
290 * Maybe the containing directory didn't exist, or
291 * maybe it was just deleted by a process that is
292 * racing with us to clean up empty directories. Try
293 * to create it:
294 */
295 enum scld_error scld_result;
296
297 if (!path_copy.len)
298 strbuf_addstr(&path_copy, path);
299
300 do {
301 scld_result = safe_create_leading_directories(path_copy.buf);
302 if (scld_result == SCLD_OK)
303 goto retry_fn;
304 } while (scld_result == SCLD_VANISHED && create_directories_remaining-- > 0);
305 }
306
307out:
308 strbuf_release(&path_copy);
309 errno = save_errno;
310 return ret;
311}
312
f7b7774f 313static void fill_sha1_path(struct strbuf *buf, const unsigned char *sha1)
ace1534d
JH
314{
315 int i;
316 for (i = 0; i < 20; i++) {
317 static char hex[] = "0123456789abcdef";
318 unsigned int val = sha1[i];
f7b7774f
JK
319 strbuf_addch(buf, hex[val >> 4]);
320 strbuf_addch(buf, hex[val & 0xf]);
afbba2f0 321 if (!i)
f7b7774f 322 strbuf_addch(buf, '/');
ace1534d
JH
323 }
324}
325
ea657730 326void sha1_file_name(struct strbuf *buf, const unsigned char *sha1)
0fcfd160 327{
34498471
CC
328 strbuf_addstr(buf, get_object_directory());
329 strbuf_addch(buf, '/');
ea657730 330 fill_sha1_path(buf, sha1);
0fcfd160
LT
331}
332
38dbe5f0
JK
333struct strbuf *alt_scratch_buf(struct alternate_object_database *alt)
334{
335 strbuf_setlen(&alt->scratch, alt->base_len);
336 return &alt->scratch;
337}
338
29ec6af2
JK
339static const char *alt_sha1_path(struct alternate_object_database *alt,
340 const unsigned char *sha1)
341{
38dbe5f0 342 struct strbuf *buf = alt_scratch_buf(alt);
f7b7774f 343 fill_sha1_path(buf, sha1);
38dbe5f0 344 return buf->buf;
0fcfd160
LT
345}
346
4ea82473
JK
347/*
348 * Return non-zero iff the path is usable as an alternate object database.
349 */
13313fc3
SB
350static int alt_odb_usable(struct raw_object_store *o,
351 struct strbuf *path,
352 const char *normalized_objdir)
4ea82473
JK
353{
354 struct alternate_object_database *alt;
355
356 /* Detect cases where alternate disappeared */
357 if (!is_directory(path->buf)) {
358 error("object directory %s does not exist; "
359 "check .git/objects/info/alternates.",
360 path->buf);
361 return 0;
362 }
363
364 /*
365 * Prevent the common mistake of listing the same
366 * thing twice, or object directory itself.
367 */
13313fc3 368 for (alt = o->alt_odb_list; alt; alt = alt->next) {
ea0fc3b4 369 if (!fspathcmp(path->buf, alt->path))
4ea82473
JK
370 return 0;
371 }
372 if (!fspathcmp(path->buf, normalized_objdir))
373 return 0;
374
375 return 1;
376}
377
ddd5d056
JH
378/*
379 * Prepare alternate object database registry.
d5a63b99
JH
380 *
381 * The variable alt_odb_list points at the list of struct
382 * alternate_object_database. The elements on this list come from
383 * non-empty elements from colon separated ALTERNATE_DB_ENVIRONMENT
384 * environment variable, and $GIT_OBJECT_DIRECTORY/info/alternates,
1494e038
JH
385 * whose contents is similar to that environment variable but can be
386 * LF separated. Its base points at a statically allocated buffer that
d5a63b99
JH
387 * contains "/the/directory/corresponding/to/.git/objects/...", while
388 * its name points just after the slash at the end of ".git/objects/"
389 * in the example above, and has enough space to hold 40-byte hex
390 * SHA1, an extra slash for the first level indirection, and the
391 * terminating NUL.
ddd5d056 392 */
ca5e6d26
SB
393#define read_info_alternates(r, rb, d) read_info_alternates_##r(rb, d)
394static void read_info_alternates_the_repository(const char *relative_base,
395 int depth);
cfc62fc9
SB
396#define link_alt_odb_entry(r, e, rb, d, n) link_alt_odb_entry_##r(e, rb, d, n)
397static int link_alt_odb_entry_the_repository(const char *entry,
398 const char *relative_base, int depth, const char *normalized_objdir)
ace1534d 399{
c2f493a4 400 struct alternate_object_database *ent;
5bdf0a84 401 struct strbuf pathbuf = STRBUF_INIT;
d5a63b99 402
85dadc38 403 if (!is_absolute_path(entry) && relative_base) {
4ac9006f 404 strbuf_realpath(&pathbuf, relative_base, 1);
5bdf0a84 405 strbuf_addch(&pathbuf, '/');
c2f493a4 406 }
6eac50d8 407 strbuf_addstr(&pathbuf, entry);
c2f493a4 408
37a95862 409 if (strbuf_normalize_path(&pathbuf) < 0 && relative_base) {
670c359d
JK
410 error("unable to normalize alternate object path: %s",
411 pathbuf.buf);
412 strbuf_release(&pathbuf);
413 return -1;
414 }
5bdf0a84
HW
415
416 /*
417 * The trailing slash after the directory name is given by
418 * this function at the end. Remove duplicates.
419 */
4ea82473
JK
420 while (pathbuf.len && pathbuf.buf[pathbuf.len - 1] == '/')
421 strbuf_setlen(&pathbuf, pathbuf.len - 1);
5bdf0a84 422
13313fc3 423 if (!alt_odb_usable(the_repository->objects, &pathbuf, normalized_objdir)) {
4ea82473 424 strbuf_release(&pathbuf);
c2f493a4
MW
425 return -1;
426 }
427
7f0fa2c0 428 ent = alloc_alt_odb(pathbuf.buf);
c2f493a4
MW
429
430 /* add the alternate entry */
031dc927
SB
431 *the_repository->objects->alt_odb_tail = ent;
432 the_repository->objects->alt_odb_tail = &(ent->next);
c2f493a4
MW
433 ent->next = NULL;
434
435 /* recursively add alternates */
ca5e6d26 436 read_info_alternates(the_repository, pathbuf.buf, depth + 1);
c2f493a4 437
4ea82473 438 strbuf_release(&pathbuf);
c2f493a4
MW
439 return 0;
440}
441
cf3c6352
JK
442static const char *parse_alt_odb_entry(const char *string,
443 int sep,
444 struct strbuf *out)
445{
446 const char *end;
447
448 strbuf_reset(out);
449
450 if (*string == '#') {
451 /* comment; consume up to next separator */
452 end = strchrnul(string, sep);
453 } else if (*string == '"' && !unquote_c_style(out, string, &end)) {
454 /*
455 * quoted path; unquote_c_style has copied the
456 * data for us and set "end". Broken quoting (e.g.,
457 * an entry that doesn't end with a quote) falls
458 * back to the unquoted case below.
459 */
460 } else {
461 /* normal, unquoted path */
462 end = strchrnul(string, sep);
463 strbuf_add(out, string, end - string);
464 }
465
466 if (*end)
467 end++;
468 return end;
469}
470
93d8d1e2
SB
471#define link_alt_odb_entries(r, a, s, rb, d) \
472 link_alt_odb_entries_##r(a, s, rb, d)
473static void link_alt_odb_entries_the_repository(const char *alt,
474 int sep,
475 const char *relative_base,
476 int depth)
c2f493a4 477{
539e7506 478 struct strbuf objdirbuf = STRBUF_INIT;
cf3c6352 479 struct strbuf entry = STRBUF_INIT;
c2f493a4 480
f28e3668
JK
481 if (!alt || !*alt)
482 return;
483
c2f493a4
MW
484 if (depth > 5) {
485 error("%s: ignoring alternate object stores, nesting too deep.",
486 relative_base);
487 return;
488 }
489
f655651e 490 strbuf_add_absolute_path(&objdirbuf, get_object_directory());
670c359d
JK
491 if (strbuf_normalize_path(&objdirbuf) < 0)
492 die("unable to normalize object directory: %s",
493 objdirbuf.buf);
539e7506 494
cf3c6352
JK
495 while (*alt) {
496 alt = parse_alt_odb_entry(alt, sep, &entry);
497 if (!entry.len)
9577e7e3 498 continue;
cfc62fc9
SB
499 link_alt_odb_entry(the_repository, entry.buf,
500 relative_base, depth, objdirbuf.buf);
9577e7e3 501 }
cf3c6352 502 strbuf_release(&entry);
539e7506 503 strbuf_release(&objdirbuf);
d5a63b99
JH
504}
505
ca5e6d26
SB
506static void read_info_alternates_the_repository(const char *relative_base,
507 int depth)
d5a63b99 508{
5015f01c 509 char *path;
dc732bd5 510 struct strbuf buf = STRBUF_INIT;
d5a63b99 511
5015f01c 512 path = xstrfmt("%s/info/alternates", relative_base);
dc732bd5 513 if (strbuf_read_file(&buf, path, 1024) < 0) {
f0f7bebe 514 warn_on_fopen_errors(path);
dc732bd5 515 free(path);
9a217f2a 516 return;
ace1534d 517 }
d5a63b99 518
93d8d1e2 519 link_alt_odb_entries(the_repository, buf.buf, '\n', relative_base, depth);
dc732bd5
JK
520 strbuf_release(&buf);
521 free(path);
ace1534d
JH
522}
523
7f0fa2c0
JK
524struct alternate_object_database *alloc_alt_odb(const char *dir)
525{
526 struct alternate_object_database *ent;
7f0fa2c0 527
597f9134 528 FLEX_ALLOC_STR(ent, path, dir);
38dbe5f0
JK
529 strbuf_init(&ent->scratch, 0);
530 strbuf_addf(&ent->scratch, "%s/", dir);
531 ent->base_len = ent->scratch.len;
7f0fa2c0
JK
532
533 return ent;
534}
535
bef70b22
DB
536void add_to_alternates_file(const char *reference)
537{
f132a127 538 struct lock_file lock = LOCK_INIT;
77b9b1d1
JK
539 char *alts = git_pathdup("objects/info/alternates");
540 FILE *in, *out;
f132a127 541 int found = 0;
77b9b1d1 542
f132a127
543 hold_lock_file_for_update(&lock, alts, LOCK_DIE_ON_ERROR);
544 out = fdopen_lock_file(&lock, "w");
77b9b1d1
JK
545 if (!out)
546 die_errno("unable to fdopen alternates lockfile");
547
548 in = fopen(alts, "r");
549 if (in) {
550 struct strbuf line = STRBUF_INIT;
77b9b1d1 551
3f163962 552 while (strbuf_getline(&line, in) != EOF) {
77b9b1d1
JK
553 if (!strcmp(reference, line.buf)) {
554 found = 1;
555 break;
556 }
557 fprintf_or_die(out, "%s\n", line.buf);
558 }
559
560 strbuf_release(&line);
561 fclose(in);
77b9b1d1
JK
562 }
563 else if (errno != ENOENT)
564 die_errno("unable to read alternates file");
565
f132a127
566 if (found) {
567 rollback_lock_file(&lock);
568 } else {
77b9b1d1 569 fprintf_or_die(out, "%s\n", reference);
f132a127 570 if (commit_lock_file(&lock))
77b9b1d1 571 die_errno("unable to move new alternates file into place");
031dc927 572 if (the_repository->objects->alt_odb_tail)
93d8d1e2
SB
573 link_alt_odb_entries(the_repository, reference,
574 '\n', NULL, 0);
77b9b1d1
JK
575 }
576 free(alts);
bef70b22
DB
577}
578
a5b34d21
JK
579void add_to_alternates_memory(const char *reference)
580{
581 /*
582 * Make sure alternates are initialized, or else our entry may be
583 * overwritten when they are.
584 */
0b209034 585 prepare_alt_odb(the_repository);
a5b34d21 586
93d8d1e2
SB
587 link_alt_odb_entries(the_repository, reference,
588 '\n', NULL, 0);
a5b34d21
JK
589}
590
9eeea7d2
SB
591/*
592 * Compute the exact path an alternate is at and returns it. In case of
593 * error NULL is returned and the human readable error is added to `err`
594 * `path` may be relative and should point to $GITDIR.
595 * `err` must not be null.
596 */
597char *compute_alternate_path(const char *path, struct strbuf *err)
598{
599 char *ref_git = NULL;
600 const char *repo, *ref_git_s;
601 int seen_error = 0;
602
603 ref_git_s = real_path_if_valid(path);
604 if (!ref_git_s) {
605 seen_error = 1;
606 strbuf_addf(err, _("path '%s' does not exist"), path);
607 goto out;
608 } else
609 /*
610 * Beware: read_gitfile(), real_path() and mkpath()
611 * return static buffer
612 */
613 ref_git = xstrdup(ref_git_s);
614
615 repo = read_gitfile(ref_git);
616 if (!repo)
617 repo = read_gitfile(mkpath("%s/.git", ref_git));
618 if (repo) {
619 free(ref_git);
620 ref_git = xstrdup(repo);
621 }
622
623 if (!repo && is_directory(mkpath("%s/.git/objects", ref_git))) {
624 char *ref_git_git = mkpathdup("%s/.git", ref_git);
625 free(ref_git);
626 ref_git = ref_git_git;
627 } else if (!is_directory(mkpath("%s/objects", ref_git))) {
628 struct strbuf sb = STRBUF_INIT;
629 seen_error = 1;
630 if (get_common_dir(&sb, ref_git)) {
631 strbuf_addf(err,
632 _("reference repository '%s' as a linked "
633 "checkout is not supported yet."),
634 path);
635 goto out;
636 }
637
638 strbuf_addf(err, _("reference repository '%s' is not a "
639 "local repository."), path);
640 goto out;
641 }
642
643 if (!access(mkpath("%s/shallow", ref_git), F_OK)) {
644 strbuf_addf(err, _("reference repository '%s' is shallow"),
645 path);
646 seen_error = 1;
647 goto out;
648 }
649
650 if (!access(mkpath("%s/info/grafts", ref_git), F_OK)) {
651 strbuf_addf(err,
652 _("reference repository '%s' is grafted"),
653 path);
654 seen_error = 1;
655 goto out;
656 }
657
658out:
659 if (seen_error) {
6a83d902 660 FREE_AND_NULL(ref_git);
9eeea7d2
SB
661 }
662
663 return ref_git;
664}
665
fe1b2268 666int foreach_alt_odb(alt_odb_fn fn, void *cb)
d79796bc
JH
667{
668 struct alternate_object_database *ent;
fe1b2268 669 int r = 0;
d79796bc 670
0b209034 671 prepare_alt_odb(the_repository);
031dc927 672 for (ent = the_repository->objects->alt_odb_list; ent; ent = ent->next) {
fe1b2268
JK
673 r = fn(ent, cb);
674 if (r)
675 break;
676 }
677 return r;
d79796bc
JH
678}
679
0b209034 680void prepare_alt_odb_the_repository(void)
c2f493a4 681{
031dc927 682 if (the_repository->objects->alt_odb_tail)
7dc24aa5
SP
683 return;
684
031dc927
SB
685 the_repository->objects->alt_odb_tail =
686 &the_repository->objects->alt_odb_list;
93d8d1e2
SB
687 link_alt_odb_entries(the_repository,
688 the_repository->objects->alternate_db,
90c62155 689 PATH_SEP, NULL, 0);
c2f493a4 690
ca5e6d26 691 read_info_alternates(the_repository, get_object_directory(), 0);
c2f493a4
MW
692}
693
3096b2ec 694/* Returns 1 if we have successfully freshened the file, 0 otherwise. */
33d4221c 695static int freshen_file(const char *fn)
ace1534d 696{
33d4221c
JK
697 struct utimbuf t;
698 t.actime = t.modtime = time(NULL);
699 return !utime(fn, &t);
0f4dc14a 700}
ace1534d 701
3096b2ec
JK
702/*
703 * All of the check_and_freshen functions return 1 if the file exists and was
704 * freshened (if freshening was requested), 0 otherwise. If they return
705 * 0, you should not assume that it is safe to skip a write of the object (it
706 * either does not exist on disk, or has a stale mtime and may be subject to
707 * pruning).
708 */
6a5e6f5e 709int check_and_freshen_file(const char *fn, int freshen)
33d4221c
JK
710{
711 if (access(fn, F_OK))
712 return 0;
3096b2ec 713 if (freshen && !freshen_file(fn))
33d4221c
JK
714 return 0;
715 return 1;
716}
717
718static int check_and_freshen_local(const unsigned char *sha1, int freshen)
719{
ea657730
CC
720 static struct strbuf buf = STRBUF_INIT;
721
722 strbuf_reset(&buf);
723 sha1_file_name(&buf, sha1);
724
725 return check_and_freshen_file(buf.buf, freshen);
33d4221c
JK
726}
727
728static int check_and_freshen_nonlocal(const unsigned char *sha1, int freshen)
0f4dc14a
BC
729{
730 struct alternate_object_database *alt;
0b209034 731 prepare_alt_odb(the_repository);
031dc927 732 for (alt = the_repository->objects->alt_odb_list; alt; alt = alt->next) {
29ec6af2
JK
733 const char *path = alt_sha1_path(alt, sha1);
734 if (check_and_freshen_file(path, freshen))
c529d75a 735 return 1;
ace1534d 736 }
c529d75a 737 return 0;
ace1534d
JH
738}
739
33d4221c
JK
740static int check_and_freshen(const unsigned char *sha1, int freshen)
741{
742 return check_and_freshen_local(sha1, freshen) ||
743 check_and_freshen_nonlocal(sha1, freshen);
744}
745
746int has_loose_object_nonlocal(const unsigned char *sha1)
747{
748 return check_and_freshen_nonlocal(sha1, 0);
749}
750
0f4dc14a
BC
751static int has_loose_object(const unsigned char *sha1)
752{
33d4221c 753 return check_and_freshen(sha1, 0);
0f4dc14a
BC
754}
755
02710228
SP
756static void mmap_limit_check(size_t length)
757{
758 static size_t limit = 0;
759 if (!limit) {
760 limit = git_env_ulong("GIT_MMAP_LIMIT", 0);
761 if (!limit)
762 limit = SIZE_MAX;
763 }
764 if (length > limit)
765 die("attempting to mmap %"PRIuMAX" over limit %"PRIuMAX,
766 (uintmax_t)length, (uintmax_t)limit);
767}
768
1570856b
JK
769void *xmmap_gently(void *start, size_t length,
770 int prot, int flags, int fd, off_t offset)
58ecbd5e 771{
02710228
SP
772 void *ret;
773
774 mmap_limit_check(length);
775 ret = mmap(start, length, prot, flags, fd, offset);
58ecbd5e
JN
776 if (ret == MAP_FAILED) {
777 if (!length)
778 return NULL;
7c3ecb32 779 release_pack_memory(length);
58ecbd5e 780 ret = mmap(start, length, prot, flags, fd, offset);
58ecbd5e
JN
781 }
782 return ret;
783}
784
1570856b
JK
785void *xmmap(void *start, size_t length,
786 int prot, int flags, int fd, off_t offset)
787{
788 void *ret = xmmap_gently(start, length, prot, flags, fd, offset);
789 if (ret == MAP_FAILED)
9ca0aaf6 790 die_errno("mmap failed");
1570856b
JK
791 return ret;
792}
793
88d0db55 794/*
090ea126
NTND
795 * With an in-core object data in "map", rehash it to make sure the
796 * object name actually matches "sha1" to detect object corruption.
797 * With "map" == NULL, try reading the object named with "sha1" using
798 * the streaming interface and rehash it to do the same.
88d0db55 799 */
090ea126
NTND
800int check_sha1_signature(const unsigned char *sha1, void *map,
801 unsigned long size, const char *type)
88d0db55 802{
0fcfd160 803 unsigned char real_sha1[20];
090ea126
NTND
804 enum object_type obj_type;
805 struct git_istream *st;
806 git_SHA_CTX c;
807 char hdr[32];
808 int hdrlen;
88d0db55 809
090ea126
NTND
810 if (map) {
811 hash_sha1_file(map, size, type, real_sha1);
812 return hashcmp(sha1, real_sha1) ? -1 : 0;
88d0db55
BC
813 }
814
090ea126
NTND
815 st = open_istream(sha1, &obj_type, &size, NULL);
816 if (!st)
817 return -1;
88d0db55 818
090ea126 819 /* Generate the header */
ef1286d3 820 hdrlen = xsnprintf(hdr, sizeof(hdr), "%s %lu", typename(obj_type), size) + 1;
88d0db55 821
090ea126
NTND
822 /* Sha1.. */
823 git_SHA1_Init(&c);
824 git_SHA1_Update(&c, hdr, hdrlen);
825 for (;;) {
826 char buf[1024 * 16];
827 ssize_t readlen = read_istream(st, buf, sizeof(buf));
1f688557 828
f54fac53
JK
829 if (readlen < 0) {
830 close_istream(st);
831 return -1;
832 }
090ea126
NTND
833 if (!readlen)
834 break;
835 git_SHA1_Update(&c, buf, readlen);
fa5fc15d 836 }
090ea126
NTND
837 git_SHA1_Final(real_sha1, &c);
838 close_istream(st);
a89fccd2 839 return hashcmp(sha1, real_sha1) ? -1 : 0;
fa5fc15d
SP
840}
841
1b8ac5ea 842int git_open_cloexec(const char *name, int flags)
a0788266 843{
1e3001a8
JH
844 int fd;
845 static int o_cloexec = O_CLOEXEC;
a0788266 846
1e3001a8
JH
847 fd = open(name, flags | o_cloexec);
848 if ((o_cloexec & O_CLOEXEC) && fd < 0 && errno == EINVAL) {
cd66ada0 849 /* Try again w/o O_CLOEXEC: the kernel might not support it */
1e3001a8
JH
850 o_cloexec &= ~O_CLOEXEC;
851 fd = open(name, flags | o_cloexec);
491a8dec 852 }
491a8dec 853
9fb9495d 854#if defined(F_GETFD) && defined(F_SETFD) && defined(FD_CLOEXEC)
491a8dec 855 {
1e3001a8 856 static int fd_cloexec = FD_CLOEXEC;
a0788266 857
1e3001a8
JH
858 if (!o_cloexec && 0 <= fd && fd_cloexec) {
859 /* Opened w/o O_CLOEXEC? try with fcntl(2) to add it */
9fb9495d
EW
860 int flags = fcntl(fd, F_GETFD);
861 if (fcntl(fd, F_SETFD, flags | fd_cloexec))
1e3001a8 862 fd_cloexec = 0;
cd66ada0 863 }
44d1c19e 864 }
a0788266 865#endif
1b8ac5ea 866 return fd;
a0788266
JS
867}
868
3cf8b462 869/*
771e7d57
JK
870 * Find "sha1" as a loose object in the local repository or in an alternate.
871 * Returns 0 on success, negative on failure.
872 *
873 * The "path" out-parameter will give the path of the object we found (if any).
874 * Note that it may point to static storage and is only valid until another
875 * call to sha1_file_name(), etc.
3cf8b462 876 */
771e7d57
JK
877static int stat_sha1_file(const unsigned char *sha1, struct stat *st,
878 const char **path)
1f688557 879{
052fe5ea 880 struct alternate_object_database *alt;
ea657730
CC
881 static struct strbuf buf = STRBUF_INIT;
882
883 strbuf_reset(&buf);
884 sha1_file_name(&buf, sha1);
885 *path = buf.buf;
d079837e 886
771e7d57 887 if (!lstat(*path, st))
052fe5ea 888 return 0;
c7934306 889
0b209034 890 prepare_alt_odb(the_repository);
052fe5ea 891 errno = ENOENT;
031dc927 892 for (alt = the_repository->objects->alt_odb_list; alt; alt = alt->next) {
771e7d57
JK
893 *path = alt_sha1_path(alt, sha1);
894 if (!lstat(*path, st))
052fe5ea 895 return 0;
c7934306
SP
896 }
897
3cf8b462
SP
898 return -1;
899}
900
771e7d57
JK
901/*
902 * Like stat_sha1_file(), but actually open the object and return the
903 * descriptor. See the caveats on the "path" parameter above.
904 */
905static int open_sha1_file(const unsigned char *sha1, const char **path)
60bb8b14 906{
44d1c19e 907 int fd;
44d1c19e 908 struct alternate_object_database *alt;
d6c8a05b 909 int most_interesting_errno;
ea657730
CC
910 static struct strbuf buf = STRBUF_INIT;
911
912 strbuf_reset(&buf);
913 sha1_file_name(&buf, sha1);
914 *path = buf.buf;
60bb8b14 915
771e7d57 916 fd = git_open(*path);
44d1c19e
LT
917 if (fd >= 0)
918 return fd;
d6c8a05b 919 most_interesting_errno = errno;
03e79c88 920
0b209034 921 prepare_alt_odb(the_repository);
031dc927 922 for (alt = the_repository->objects->alt_odb_list; alt; alt = alt->next) {
771e7d57
JK
923 *path = alt_sha1_path(alt, sha1);
924 fd = git_open(*path);
44d1c19e
LT
925 if (fd >= 0)
926 return fd;
d6c8a05b
JK
927 if (most_interesting_errno == ENOENT)
928 most_interesting_errno = errno;
03e79c88 929 }
d6c8a05b 930 errno = most_interesting_errno;
44d1c19e 931 return -1;
1f688557
JH
932}
933
f6371f92
JK
934/*
935 * Map the loose object at "path" if it is not NULL, or the path found by
936 * searching for a loose object named "sha1".
937 */
938static void *map_sha1_file_1(const char *path,
939 const unsigned char *sha1,
940 unsigned long *size)
27d69a46 941{
0fcfd160 942 void *map;
144bde78 943 int fd;
84dd81c1 944
f6371f92
JK
945 if (path)
946 fd = git_open(path);
8261e1f1 947 else
f6371f92 948 fd = open_sha1_file(sha1, &path);
44d1c19e
LT
949 map = NULL;
950 if (fd >= 0) {
951 struct stat st;
1f688557 952
44d1c19e
LT
953 if (!fstat(fd, &st)) {
954 *size = xsize_t(st.st_size);
33e42de0
MM
955 if (!*size) {
956 /* mmap() is forbidden on empty files */
771e7d57 957 error("object file %s is empty", path);
33e42de0
MM
958 return NULL;
959 }
44d1c19e 960 map = xmmap(NULL, *size, PROT_READ, MAP_PRIVATE, fd, 0);
144bde78 961 }
44d1c19e 962 close(fd);
74e34e1f 963 }
0fcfd160 964 return map;
74e34e1f
NP
965}
966
f6371f92 967void *map_sha1_file(const unsigned char *sha1, unsigned long *size)
068f85e3 968{
f6371f92 969 return map_sha1_file_1(NULL, sha1, size);
068f85e3 970}
971
d21f8426
JH
972static int unpack_sha1_short_header(git_zstream *stream,
973 unsigned char *map, unsigned long mapsize,
974 void *buffer, unsigned long bufsiz)
47fe3f6e 975{
c4483576
LT
976 /* Get the data stream */
977 memset(stream, 0, sizeof(*stream));
978 stream->next_in = map;
979 stream->avail_in = mapsize;
980 stream->next_out = buffer;
93821bd9 981 stream->avail_out = bufsiz;
47fe3f6e 982
39c68542 983 git_inflate_init(stream);
cc5c54e7 984 return git_inflate(stream, 0);
9a217f2a
JH
985}
986
d21f8426
JH
987int unpack_sha1_header(git_zstream *stream,
988 unsigned char *map, unsigned long mapsize,
989 void *buffer, unsigned long bufsiz)
1f688557 990{
d21f8426
JH
991 int status = unpack_sha1_short_header(stream, map, mapsize,
992 buffer, bufsiz);
42873078 993
d21f8426
JH
994 if (status < Z_OK)
995 return status;
628522ec 996
d21f8426
JH
997 /* Make sure we have the terminating NUL */
998 if (!memchr(buffer, '\0', stream->next_out - (unsigned char *)buffer))
999 return -1;
1f688557
JH
1000 return 0;
1001}
1002
46f03448
KN
1003static int unpack_sha1_header_to_strbuf(git_zstream *stream, unsigned char *map,
1004 unsigned long mapsize, void *buffer,
1005 unsigned long bufsiz, struct strbuf *header)
d131b7af 1006{
46f03448
KN
1007 int status;
1008
d21f8426
JH
1009 status = unpack_sha1_short_header(stream, map, mapsize, buffer, bufsiz);
1010 if (status < Z_OK)
1011 return -1;
d131b7af 1012
46f03448
KN
1013 /*
1014 * Check if entire header is unpacked in the first iteration.
d131b7af 1015 */
46f03448
KN
1016 if (memchr(buffer, '\0', stream->next_out - (unsigned char *)buffer))
1017 return 0;
d131b7af 1018
46f03448
KN
1019 /*
1020 * buffer[0..bufsiz] was not large enough. Copy the partial
1021 * result out to header, and then append the result of further
1022 * reading the stream.
1023 */
1024 strbuf_add(header, buffer, stream->next_out - (unsigned char *)buffer);
1025 stream->next_out = buffer;
1026 stream->avail_out = bufsiz;
d131b7af 1027
46f03448
KN
1028 do {
1029 status = git_inflate(stream, 0);
1030 strbuf_add(header, buffer, stream->next_out - (unsigned char *)buffer);
1031 if (memchr(buffer, '\0', stream->next_out - (unsigned char *)buffer))
1032 return 0;
1033 stream->next_out = buffer;
1034 stream->avail_out = bufsiz;
1035 } while (status != Z_STREAM_END);
1036 return -1;
d131b7af
SP
1037}
1038
ef49a7a0 1039static void *unpack_sha1_rest(git_zstream *stream, void *buffer, unsigned long size, const unsigned char *sha1)
95099731 1040{
5180cacc 1041 int bytes = strlen(buffer) + 1;
3aee68aa 1042 unsigned char *buf = xmallocz(size);
93821bd9 1043 unsigned long n;
7efbff75 1044 int status = Z_OK;
95099731 1045
93821bd9
LT
1046 n = stream->total_out - bytes;
1047 if (n > size)
1048 n = size;
1049 memcpy(buf, (char *) buffer + bytes, n);
1050 bytes = n;
456cdf6e
LT
1051 if (bytes <= size) {
1052 /*
1053 * The above condition must be (bytes <= size), not
1054 * (bytes < size). In other words, even though we
ccf5ace0 1055 * expect no more output and set avail_out to zero,
456cdf6e
LT
1056 * the input zlib stream may have bytes that express
1057 * "this concludes the stream", and we *do* want to
1058 * eat that input.
1059 *
1060 * Otherwise we would not be able to test that we
1061 * consumed all the input to reach the expected size;
1062 * we also want to check that zlib tells us that all
1063 * went well with status == Z_STREAM_END at the end.
1064 */
5180cacc
LT
1065 stream->next_out = buf + bytes;
1066 stream->avail_out = size - bytes;
7efbff75 1067 while (status == Z_OK)
39c68542 1068 status = git_inflate(stream, Z_FINISH);
5180cacc 1069 }
456cdf6e 1070 if (status == Z_STREAM_END && !stream->avail_in) {
39c68542 1071 git_inflate_end(stream);
7efbff75 1072 return buf;
95099731
NTND
1073 }
1074
7efbff75
JH
1075 if (status < 0)
1076 error("corrupt loose object '%s'", sha1_to_hex(sha1));
1077 else if (stream->avail_in)
1078 error("garbage at end of loose object '%s'",
1079 sha1_to_hex(sha1));
1080 free(buf);
1081 return NULL;
95099731
NTND
1082}
1083
d40d535b 1084/*
5180cacc
LT
1085 * We used to just use "sscanf()", but that's actually way
1086 * too permissive for what we want to check. So do an anal
1087 * object header parse by hand.
d40d535b 1088 */
46f03448
KN
1089static int parse_sha1_header_extended(const char *hdr, struct object_info *oi,
1090 unsigned int flags)
1f688557 1091{
46f03448 1092 const char *type_buf = hdr;
5180cacc 1093 unsigned long size;
46f03448 1094 int type, type_len = 0;
43057304 1095
5180cacc 1096 /*
46f03448 1097 * The type can be of any size but is followed by
21666f1a 1098 * a space.
5180cacc 1099 */
5180cacc
LT
1100 for (;;) {
1101 char c = *hdr++;
d21f8426
JH
1102 if (!c)
1103 return -1;
5180cacc
LT
1104 if (c == ' ')
1105 break;
46f03448 1106 type_len++;
5180cacc 1107 }
1f688557 1108
46f03448
KN
1109 type = type_from_string_gently(type_buf, type_len, 1);
1110 if (oi->typename)
1111 strbuf_add(oi->typename, type_buf, type_len);
1112 /*
1113 * Set type to 0 if its an unknown object and
2e3a16b2 1114 * we're obtaining the type using '--allow-unknown-type'
46f03448
KN
1115 * option.
1116 */
19fc5e84 1117 if ((flags & OBJECT_INFO_ALLOW_UNKNOWN_TYPE) && (type < 0))
46f03448
KN
1118 type = 0;
1119 else if (type < 0)
1120 die("invalid object type");
1121 if (oi->typep)
1122 *oi->typep = type;
5180cacc
LT
1123
1124 /*
1125 * The length must follow immediately, and be in canonical
1126 * decimal format (ie "010" is not valid).
1127 */
1128 size = *hdr++ - '0';
1129 if (size > 9)
1130 return -1;
1131 if (size) {
1132 for (;;) {
1133 unsigned long c = *hdr - '0';
1134 if (c > 9)
1135 break;
1136 hdr++;
1137 size = size * 10 + c;
1b1005d1 1138 }
c01f51cc 1139 }
46f03448
KN
1140
1141 if (oi->sizep)
1142 *oi->sizep = size;
5180cacc
LT
1143
1144 /*
1145 * The length must be followed by a zero byte
1146 */
46f03448 1147 return *hdr ? -1 : type;
1f688557
JH
1148}
1149
46f03448 1150int parse_sha1_header(const char *hdr, unsigned long *sizep)
bf592c50 1151{
27b5c1a0 1152 struct object_info oi = OBJECT_INFO_INIT;
21666f1a 1153
46f03448 1154 oi.sizep = sizep;
1f0c0d36 1155 return parse_sha1_header_extended(hdr, &oi, 0);
bf592c50
DB
1156}
1157
052fe5ea 1158static int sha1_loose_object_info(const unsigned char *sha1,
46f03448
KN
1159 struct object_info *oi,
1160 int flags)
65c2e0c3 1161{
46f03448
KN
1162 int status = 0;
1163 unsigned long mapsize;
65c2e0c3 1164 void *map;
ef49a7a0 1165 git_zstream stream;
d65a16f6 1166 char hdr[32];
46f03448 1167 struct strbuf hdrbuf = STRBUF_INIT;
c84a1f3e 1168 unsigned long size_scratch;
65c2e0c3 1169
5d642e75
JK
1170 if (oi->delta_base_sha1)
1171 hashclr(oi->delta_base_sha1);
1172
052fe5ea
JK
1173 /*
1174 * If we don't care about type or size, then we don't
4ef8d1dd
JH
1175 * need to look inside the object at all. Note that we
1176 * do not optimize out the stat call, even if the
1177 * caller doesn't care about the disk-size, since our
1178 * return value implicitly indicates whether the
1179 * object even exists.
052fe5ea 1180 */
c84a1f3e 1181 if (!oi->typep && !oi->typename && !oi->sizep && !oi->contentp) {
771e7d57 1182 const char *path;
4ef8d1dd 1183 struct stat st;
771e7d57 1184 if (stat_sha1_file(sha1, &st, &path) < 0)
4ef8d1dd
JH
1185 return -1;
1186 if (oi->disk_sizep)
23c339c0 1187 *oi->disk_sizep = st.st_size;
052fe5ea
JK
1188 return 0;
1189 }
1190
bb6b8e4f 1191 map = map_sha1_file(sha1, &mapsize);
f0df4ed5 1192 if (!map)
dbea72a8 1193 return -1;
c84a1f3e
JT
1194
1195 if (!oi->sizep)
1196 oi->sizep = &size_scratch;
1197
23c339c0
JK
1198 if (oi->disk_sizep)
1199 *oi->disk_sizep = mapsize;
19fc5e84 1200 if ((flags & OBJECT_INFO_ALLOW_UNKNOWN_TYPE)) {
46f03448
KN
1201 if (unpack_sha1_header_to_strbuf(&stream, map, mapsize, hdr, sizeof(hdr), &hdrbuf) < 0)
1202 status = error("unable to unpack %s header with --allow-unknown-type",
1203 sha1_to_hex(sha1));
1204 } else if (unpack_sha1_header(&stream, map, mapsize, hdr, sizeof(hdr)) < 0)
36e4d74a
JH
1205 status = error("unable to unpack %s header",
1206 sha1_to_hex(sha1));
46f03448
KN
1207 if (status < 0)
1208 ; /* Do nothing */
1209 else if (hdrbuf.len) {
1210 if ((status = parse_sha1_header_extended(hdrbuf.buf, oi, flags)) < 0)
1211 status = error("unable to parse %s header with --allow-unknown-type",
1212 sha1_to_hex(sha1));
1213 } else if ((status = parse_sha1_header_extended(hdr, oi, flags)) < 0)
36e4d74a 1214 status = error("unable to parse %s header", sha1_to_hex(sha1));
c84a1f3e 1215
b3ea7dd3 1216 if (status >= 0 && oi->contentp) {
c84a1f3e
JT
1217 *oi->contentp = unpack_sha1_rest(&stream, hdr,
1218 *oi->sizep, sha1);
b3ea7dd3
JK
1219 if (!*oi->contentp) {
1220 git_inflate_end(&stream);
1221 status = -1;
1222 }
1223 } else
c84a1f3e
JT
1224 git_inflate_end(&stream);
1225
65c2e0c3 1226 munmap(map, mapsize);
46f03448 1227 if (status && oi->typep)
23c339c0 1228 *oi->typep = status;
c84a1f3e
JT
1229 if (oi->sizep == &size_scratch)
1230 oi->sizep = NULL;
46f03448 1231 strbuf_release(&hdrbuf);
3ab0fb06 1232 oi->whence = OI_LOOSE;
93cff9a9 1233 return (status < 0) ? status : 0;
65c2e0c3
JH
1234}
1235
8b4c0103
JT
1236int fetch_if_missing = 1;
1237
de7b5d62 1238int sha1_object_info_extended(const unsigned char *sha1, struct object_info *oi, unsigned flags)
f0df4ed5 1239{
cd585e2a 1240 static struct object_info blank_oi = OBJECT_INFO_INIT;
f0df4ed5 1241 struct pack_entry e;
5b086407 1242 int rtype;
1f0c0d36
JT
1243 const unsigned char *real = (flags & OBJECT_INFO_LOOKUP_REPLACE) ?
1244 lookup_replace_object(sha1) :
1245 sha1;
8b4c0103 1246 int already_retried = 0;
f0df4ed5 1247
87b5e236
JK
1248 if (is_null_sha1(real))
1249 return -1;
1250
cd585e2a
JT
1251 if (!oi)
1252 oi = &blank_oi;
1253
dfdd4afc
JT
1254 if (!(flags & OBJECT_INFO_SKIP_CACHED)) {
1255 struct cached_object *co = find_cached_object(real);
1256 if (co) {
1257 if (oi->typep)
1258 *(oi->typep) = co->type;
1259 if (oi->sizep)
1260 *(oi->sizep) = co->size;
1261 if (oi->disk_sizep)
1262 *(oi->disk_sizep) = 0;
1263 if (oi->delta_base_sha1)
1264 hashclr(oi->delta_base_sha1);
1265 if (oi->typename)
1266 strbuf_addstr(oi->typename, typename(co->type));
1267 if (oi->contentp)
1268 *oi->contentp = xmemdupz(co->buf, co->size);
1269 oi->whence = OI_CACHED;
1270 return 0;
1271 }
c4d9986f
NTND
1272 }
1273
8b4c0103
JT
1274 while (1) {
1275 if (find_pack_entry(real, &e))
1276 break;
1277
ddd63e64 1278 /* Most likely it's a loose object. */
3ab0fb06 1279 if (!sha1_loose_object_info(real, oi, flags))
5b086407 1280 return 0;
ddd63e64
SG
1281
1282 /* Not a loose object; someone else may have just packed it. */
8b4c0103
JT
1283 reprepare_packed_git();
1284 if (find_pack_entry(real, &e))
1285 break;
1286
1287 /* Check if it is a missing object */
1288 if (fetch_if_missing && repository_format_partial_clone &&
1289 !already_retried) {
1290 /*
1291 * TODO Investigate haveing fetch_object() return
1292 * TODO error/success and stopping the music here.
1293 */
1294 fetch_object(repository_format_partial_clone, real);
1295 already_retried = 1;
1296 continue;
dfdd4afc 1297 }
8b4c0103
JT
1298
1299 return -1;
f0df4ed5 1300 }
3d77d877 1301
cd585e2a
JT
1302 if (oi == &blank_oi)
1303 /*
1304 * We know that the caller doesn't actually need the
1305 * information below, so return early.
1306 */
1307 return 0;
23c339c0 1308 rtype = packed_object_info(e.p, e.offset, oi);
412916ee 1309 if (rtype < 0) {
1f7117ef
CC
1310 mark_bad_packed_object(e.p, real);
1311 return sha1_object_info_extended(real, oi, 0);
3ab0fb06 1312 } else if (oi->whence == OI_PACKED) {
9a490590
JH
1313 oi->u.packed.offset = e.offset;
1314 oi->u.packed.pack = e.p;
1315 oi->u.packed.is_delta = (rtype == OBJ_REF_DELTA ||
1316 rtype == OBJ_OFS_DELTA);
3d77d877
NP
1317 }
1318
5b086407 1319 return 0;
f0df4ed5
JS
1320}
1321
3fc0dca9 1322/* returns enum object_type or negative */
9a490590
JH
1323int sha1_object_info(const unsigned char *sha1, unsigned long *sizep)
1324{
5b086407 1325 enum object_type type;
27b5c1a0 1326 struct object_info oi = OBJECT_INFO_INIT;
9a490590 1327
5b086407 1328 oi.typep = &type;
9a490590 1329 oi.sizep = sizep;
1f0c0d36
JT
1330 if (sha1_object_info_extended(sha1, &oi,
1331 OBJECT_INFO_LOOKUP_REPLACE) < 0)
5b086407
JK
1332 return -1;
1333 return type;
9a490590
JH
1334}
1335
f1d8130b
JT
1336static void *read_object(const unsigned char *sha1, enum object_type *type,
1337 unsigned long *size)
1338{
1339 struct object_info oi = OBJECT_INFO_INIT;
1340 void *content;
1341 oi.typep = type;
1342 oi.sizep = size;
1343 oi.contentp = &content;
1344
1345 if (sha1_object_info_extended(sha1, &oi, 0) < 0)
1346 return NULL;
1347 return content;
1348}
1349
21666f1a
NP
1350int pretend_sha1_file(void *buf, unsigned long len, enum object_type type,
1351 unsigned char *sha1)
d66b37bb
JH
1352{
1353 struct cached_object *co;
1354
21666f1a 1355 hash_sha1_file(buf, len, typename(type), sha1);
d66b37bb
JH
1356 if (has_sha1_file(sha1) || find_cached_object(sha1))
1357 return 0;
c7353967 1358 ALLOC_GROW(cached_objects, cached_object_nr + 1, cached_object_alloc);
d66b37bb
JH
1359 co = &cached_objects[cached_object_nr++];
1360 co->size = len;
21666f1a 1361 co->type = type;
efa13f7b
JH
1362 co->buf = xmalloc(len);
1363 memcpy(co->buf, buf, len);
d66b37bb
JH
1364 hashcpy(co->sha1, sha1);
1365 return 0;
1366}
1367
b6c4cecc
JH
1368/*
1369 * This function dies on corrupt objects; the callers who want to
1370 * deal with them should arrange to call read_object() and give error
1371 * messages themselves.
1372 */
5bf29b95
JH
1373void *read_sha1_file_extended(const unsigned char *sha1,
1374 enum object_type *type,
1375 unsigned long *size,
1f0c0d36 1376 int lookup_replace)
ac939109 1377{
3ba7a065 1378 void *data;
b6c4cecc 1379 const struct packed_git *p;
771e7d57
JK
1380 const char *path;
1381 struct stat st;
1f0c0d36
JT
1382 const unsigned char *repl = lookup_replace ? lookup_replace_object(sha1)
1383 : sha1;
b6c4cecc 1384
3ba7a065
JH
1385 errno = 0;
1386 data = read_object(repl, type, size);
4bbf5a26 1387 if (data)
b6c4cecc 1388 return data;
68095570 1389
25f3af3f 1390 if (errno && errno != ENOENT)
3ba7a065
JH
1391 die_errno("failed to read object %s", sha1_to_hex(sha1));
1392
68095570 1393 /* die if we replaced an object with one that does not exist */
b6c4cecc 1394 if (repl != sha1)
68095570
CC
1395 die("replacement %s not found for %s",
1396 sha1_to_hex(repl), sha1_to_hex(sha1));
1397
771e7d57 1398 if (!stat_sha1_file(repl, &st, &path))
b6c4cecc
JH
1399 die("loose object %s (stored in %s) is corrupt",
1400 sha1_to_hex(repl), path);
68095570 1401
b6c4cecc
JH
1402 if ((p = has_packed_and_bad(repl)) != NULL)
1403 die("packed object %s (stored in %s) is corrupt",
1404 sha1_to_hex(repl), p->pack_name);
f5552aee 1405
b6c4cecc 1406 return NULL;
ac939109
NP
1407}
1408
40469ee9 1409void *read_object_with_reference(const unsigned char *sha1,
21666f1a 1410 const char *required_type_name,
40469ee9
JH
1411 unsigned long *size,
1412 unsigned char *actual_sha1_return)
f4913f91 1413{
21666f1a 1414 enum object_type type, required_type;
f4913f91
JH
1415 void *buffer;
1416 unsigned long isize;
40469ee9 1417 unsigned char actual_sha1[20];
f4913f91 1418
21666f1a 1419 required_type = type_from_string(required_type_name);
e702496e 1420 hashcpy(actual_sha1, sha1);
40469ee9
JH
1421 while (1) {
1422 int ref_length = -1;
1423 const char *ref_type = NULL;
f4913f91 1424
21666f1a 1425 buffer = read_sha1_file(actual_sha1, &type, &isize);
40469ee9
JH
1426 if (!buffer)
1427 return NULL;
21666f1a 1428 if (type == required_type) {
40469ee9
JH
1429 *size = isize;
1430 if (actual_sha1_return)
e702496e 1431 hashcpy(actual_sha1_return, actual_sha1);
40469ee9
JH
1432 return buffer;
1433 }
1434 /* Handle references */
21666f1a 1435 else if (type == OBJ_COMMIT)
40469ee9 1436 ref_type = "tree ";
21666f1a 1437 else if (type == OBJ_TAG)
40469ee9
JH
1438 ref_type = "object ";
1439 else {
1440 free(buffer);
1441 return NULL;
1442 }
1443 ref_length = strlen(ref_type);
f4913f91 1444
50974ec9
MK
1445 if (ref_length + 40 > isize ||
1446 memcmp(buffer, ref_type, ref_length) ||
1d7f171c 1447 get_sha1_hex((char *) buffer + ref_length, actual_sha1)) {
40469ee9
JH
1448 free(buffer);
1449 return NULL;
1450 }
1cf58e72 1451 free(buffer);
40469ee9
JH
1452 /* Now we have the ID of the referred-to object in
1453 * actual_sha1. Check again. */
f4913f91 1454 }
f4913f91
JH
1455}
1456
ce9fbf16 1457static void write_sha1_file_prepare(const void *buf, unsigned long len,
972a9155 1458 const char *type, unsigned char *sha1,
d65a16f6 1459 char *hdr, int *hdrlen)
d410c0f5 1460{
9126f009 1461 git_SHA_CTX c;
d410c0f5
JH
1462
1463 /* Generate the header */
ef1286d3 1464 *hdrlen = xsnprintf(hdr, *hdrlen, "%s %lu", type, len)+1;
d410c0f5
JH
1465
1466 /* Sha1.. */
9126f009
NP
1467 git_SHA1_Init(&c);
1468 git_SHA1_Update(&c, hdr, *hdrlen);
1469 git_SHA1_Update(&c, buf, len);
1470 git_SHA1_Final(sha1, &c);
d410c0f5
JH
1471}
1472
230f1322 1473/*
5a688fe4 1474 * Move the just written object into its final resting place.
230f1322 1475 */
cb5add58 1476int finalize_object_file(const char *tmpfile, const char *filename)
230f1322 1477{
e32c0a9c 1478 int ret = 0;
5a688fe4 1479
348df166 1480 if (object_creation_mode == OBJECT_CREATION_USES_RENAMES)
be66a6c4
JS
1481 goto try_rename;
1482 else if (link(tmpfile, filename))
e32c0a9c 1483 ret = errno;
7ebb6fca
LT
1484
1485 /*
1486 * Coda hack - coda doesn't like cross-directory links,
1487 * so we fall back to a rename, which will mean that it
1488 * won't be able to check collisions, but that's not a
1489 * big deal.
1490 *
1491 * The same holds for FAT formatted media.
1492 *
3be1f18e 1493 * When this succeeds, we just return. We have nothing
7ebb6fca
LT
1494 * left to unlink.
1495 */
1496 if (ret && ret != EEXIST) {
be66a6c4 1497 try_rename:
7ebb6fca 1498 if (!rename(tmpfile, filename))
3be1f18e 1499 goto out;
9e48b389 1500 ret = errno;
230f1322 1501 }
691f1a28 1502 unlink_or_warn(tmpfile);
230f1322
LT
1503 if (ret) {
1504 if (ret != EEXIST) {
7616c6ca 1505 return error_errno("unable to write sha1 filename %s", filename);
230f1322
LT
1506 }
1507 /* FIXME!!! Collision check here ? */
1508 }
1509
3be1f18e 1510out:
5256b006 1511 if (adjust_shared_perm(filename))
5a688fe4 1512 return error("unable to set permission to '%s'", filename);
230f1322
LT
1513 return 0;
1514}
1515
4d548150
LT
1516static int write_buffer(int fd, const void *buf, size_t len)
1517{
d34cf19b 1518 if (write_in_full(fd, buf, len) < 0)
7616c6ca 1519 return error_errno("file write error");
4d548150
LT
1520 return 0;
1521}
1522
ce9fbf16 1523int hash_sha1_file(const void *buf, unsigned long len, const char *type,
abdc3fc8
RS
1524 unsigned char *sha1)
1525{
d65a16f6 1526 char hdr[32];
ef1286d3 1527 int hdrlen = sizeof(hdr);
abdc3fc8
RS
1528 write_sha1_file_prepare(buf, len, type, sha1, hdr, &hdrlen);
1529 return 0;
1530}
1531
e9039dd3
LT
1532/* Finalize a file on disk, and close it. */
1533static void close_sha1_file(int fd)
1534{
aafe9fba
LT
1535 if (fsync_object_files)
1536 fsync_or_die(fd, "sha1 file");
e9039dd3 1537 if (close(fd) != 0)
d824cbba 1538 die_errno("error when closing sha1 file");
e9039dd3
LT
1539}
1540
5723fe7e
LT
1541/* Size of directory component, including the ending '/' */
1542static inline int directory_size(const char *filename)
1543{
1544 const char *s = strrchr(filename, '/');
1545 if (!s)
1546 return 0;
1547 return s - filename + 1;
1548}
1549
1550/*
1551 * This creates a temporary file in the same directory as the final
1552 * 'filename'
1553 *
1554 * We want to avoid cross-directory filename renames, because those
1555 * can have problems on various filesystems (FAT, NFS, Coda).
1556 */
d4b3d11a 1557static int create_tmpfile(struct strbuf *tmp, const char *filename)
5723fe7e
LT
1558{
1559 int fd, dirlen = directory_size(filename);
1560
d4b3d11a
JK
1561 strbuf_reset(tmp);
1562 strbuf_add(tmp, filename, dirlen);
1563 strbuf_addstr(tmp, "tmp_obj_XXXXXX");
1564 fd = git_mkstemp_mode(tmp->buf, 0444);
cbacbf4e 1565 if (fd < 0 && dirlen && errno == ENOENT) {
d4b3d11a
JK
1566 /*
1567 * Make sure the directory exists; note that the contents
1568 * of the buffer are undefined after mkstemp returns an
1569 * error, so we have to rewrite the whole buffer from
1570 * scratch.
1571 */
1572 strbuf_reset(tmp);
1573 strbuf_add(tmp, filename, dirlen - 1);
1574 if (mkdir(tmp->buf, 0777) && errno != EEXIST)
b2476a60 1575 return -1;
d4b3d11a 1576 if (adjust_shared_perm(tmp->buf))
5723fe7e
LT
1577 return -1;
1578
1579 /* Try again */
d4b3d11a
JK
1580 strbuf_addstr(tmp, "/tmp_obj_XXXXXX");
1581 fd = git_mkstemp_mode(tmp->buf, 0444);
5723fe7e
LT
1582 }
1583 return fd;
1584}
1585
bbac7311 1586static int write_loose_object(const unsigned char *sha1, char *hdr, int hdrlen,
c00e657d 1587 const void *buf, unsigned long len, time_t mtime)
0fcfd160 1588{
915308b1 1589 int fd, ret;
9892beba 1590 unsigned char compressed[4096];
ef49a7a0 1591 git_zstream stream;
748af44c
NP
1592 git_SHA_CTX c;
1593 unsigned char parano_sha1[20];
d4b3d11a 1594 static struct strbuf tmp_file = STRBUF_INIT;
ea657730
CC
1595 static struct strbuf filename = STRBUF_INIT;
1596
1597 strbuf_reset(&filename);
1598 sha1_file_name(&filename, sha1);
a44c9a5e 1599
ea657730 1600 fd = create_tmpfile(&tmp_file, filename.buf);
aac17941 1601 if (fd < 0) {
35243577 1602 if (errno == EACCES)
82247e9b 1603 return error("insufficient permission for adding an object to repository database %s", get_object_directory());
916d081b 1604 else
7616c6ca 1605 return error_errno("unable to create temporary file");
aac17941
LT
1606 }
1607
0fcfd160 1608 /* Set it up */
55bb5c91 1609 git_deflate_init(&stream, zlib_compression_level);
0fcfd160 1610 stream.next_out = compressed;
9892beba 1611 stream.avail_out = sizeof(compressed);
748af44c 1612 git_SHA1_Init(&c);
a44c9a5e
LT
1613
1614 /* First header.. */
d65a16f6 1615 stream.next_in = (unsigned char *)hdr;
a44c9a5e 1616 stream.avail_in = hdrlen;
55bb5c91
JH
1617 while (git_deflate(&stream, 0) == Z_OK)
1618 ; /* nothing */
748af44c 1619 git_SHA1_Update(&c, hdr, hdrlen);
a44c9a5e
LT
1620
1621 /* Then the data itself.. */
c00e657d 1622 stream.next_in = (void *)buf;
a44c9a5e 1623 stream.avail_in = len;
9892beba 1624 do {
748af44c 1625 unsigned char *in0 = stream.next_in;
55bb5c91 1626 ret = git_deflate(&stream, Z_FINISH);
748af44c 1627 git_SHA1_Update(&c, in0, stream.next_in - in0);
9892beba
NP
1628 if (write_buffer(fd, compressed, stream.next_out - compressed) < 0)
1629 die("unable to write sha1 file");
1630 stream.next_out = compressed;
1631 stream.avail_out = sizeof(compressed);
1632 } while (ret == Z_OK);
1633
ac54c277
LT
1634 if (ret != Z_STREAM_END)
1635 die("unable to deflate new object %s (%d)", sha1_to_hex(sha1), ret);
55bb5c91 1636 ret = git_deflate_end_gently(&stream);
ac54c277
LT
1637 if (ret != Z_OK)
1638 die("deflateEnd on object %s failed (%d)", sha1_to_hex(sha1), ret);
748af44c
NP
1639 git_SHA1_Final(parano_sha1, &c);
1640 if (hashcmp(sha1, parano_sha1) != 0)
1641 die("confused by unstable object source data for %s", sha1_to_hex(sha1));
ac54c277 1642
e9039dd3 1643 close_sha1_file(fd);
0fcfd160 1644
bbac7311
NP
1645 if (mtime) {
1646 struct utimbuf utb;
1647 utb.actime = mtime;
1648 utb.modtime = mtime;
d4b3d11a 1649 if (utime(tmp_file.buf, &utb) < 0)
7616c6ca 1650 warning_errno("failed utime() on %s", tmp_file.buf);
bbac7311
NP
1651 }
1652
ea657730 1653 return finalize_object_file(tmp_file.buf, filename.buf);
0fcfd160 1654}
8237b185 1655
33d4221c
JK
1656static int freshen_loose_object(const unsigned char *sha1)
1657{
1658 return check_and_freshen(sha1, 1);
1659}
1660
1661static int freshen_packed_object(const unsigned char *sha1)
1662{
1663 struct pack_entry e;
ee1c6c34
JK
1664 if (!find_pack_entry(sha1, &e))
1665 return 0;
1666 if (e.p->freshened)
1667 return 1;
1668 if (!freshen_file(e.p->pack_name))
1669 return 0;
1670 e.p->freshened = 1;
1671 return 1;
33d4221c
JK
1672}
1673
1427a7ff 1674int write_sha1_file(const void *buf, unsigned long len, const char *type, unsigned char *sha1)
bbac7311 1675{
bbac7311 1676 char hdr[32];
ef1286d3 1677 int hdrlen = sizeof(hdr);
bbac7311
NP
1678
1679 /* Normally if we have it in the pack then we do not bother writing
1680 * it out into .git/objects/??/?{38} file.
1681 */
1682 write_sha1_file_prepare(buf, len, type, sha1, hdr, &hdrlen);
b5f52f37 1683 if (freshen_packed_object(sha1) || freshen_loose_object(sha1))
bbac7311
NP
1684 return 0;
1685 return write_loose_object(sha1, hdr, hdrlen, buf, len, 0);
1686}
1687
0c3db67c 1688int hash_sha1_file_literally(const void *buf, unsigned long len, const char *type,
da77611d 1689 struct object_id *oid, unsigned flags)
0c3db67c
ES
1690{
1691 char *header;
1692 int hdrlen, status = 0;
1693
1694 /* type string, SP, %lu of the length plus NUL must fit this */
ef1286d3
JK
1695 hdrlen = strlen(type) + 32;
1696 header = xmalloc(hdrlen);
da77611d 1697 write_sha1_file_prepare(buf, len, type, oid->hash, header, &hdrlen);
0c3db67c
ES
1698
1699 if (!(flags & HASH_WRITE_OBJECT))
1700 goto cleanup;
da77611d 1701 if (freshen_packed_object(oid->hash) || freshen_loose_object(oid->hash))
0c3db67c 1702 goto cleanup;
da77611d 1703 status = write_loose_object(oid->hash, header, hdrlen, buf, len, 0);
0c3db67c
ES
1704
1705cleanup:
1706 free(header);
1707 return status;
1708}
1709
bbac7311
NP
1710int force_object_loose(const unsigned char *sha1, time_t mtime)
1711{
bbac7311
NP
1712 void *buf;
1713 unsigned long len;
1714 enum object_type type;
1715 char hdr[32];
1716 int hdrlen;
1fb23e65 1717 int ret;
bbac7311 1718
c529d75a 1719 if (has_loose_object(sha1))
bbac7311 1720 return 0;
789bf26b 1721 buf = read_object(sha1, &type, &len);
bbac7311
NP
1722 if (!buf)
1723 return error("cannot read sha1_file for %s", sha1_to_hex(sha1));
ef1286d3 1724 hdrlen = xsnprintf(hdr, sizeof(hdr), "%s %lu", typename(type), len) + 1;
1fb23e65
BS
1725 ret = write_loose_object(sha1, hdr, hdrlen, buf, len, mtime);
1726 free(buf);
1727
1728 return ret;
bbac7311
NP
1729}
1730
0eeb077b 1731int has_sha1_file_with_flags(const unsigned char *sha1, int flags)
8237b185 1732{
3e8b7d3c
JN
1733 if (!startup_info->have_repository)
1734 return 0;
e83e71c5
JT
1735 return sha1_object_info_extended(sha1, NULL,
1736 flags | OBJECT_INFO_SKIP_CACHED) >= 0;
b419aa25 1737}
1738
1739int has_object_file(const struct object_id *oid)
1740{
1741 return has_sha1_file(oid->hash);
8237b185 1742}
74400e71 1743
5827a035
JK
1744int has_object_file_with_flags(const struct object_id *oid, int flags)
1745{
1746 return has_sha1_file_with_flags(oid->hash, flags);
1747}
1748
c879daa2
NTND
1749static void check_tree(const void *buf, size_t size)
1750{
1751 struct tree_desc desc;
1752 struct name_entry entry;
1753
1754 init_tree_desc(&desc, buf, size);
1755 while (tree_entry(&desc, &entry))
1756 /* do nothing
1757 * tree_entry() will die() on malformed entries */
1758 ;
1759}
1760
1761static void check_commit(const void *buf, size_t size)
1762{
1763 struct commit c;
1764 memset(&c, 0, sizeof(c));
1765 if (parse_commit_buffer(&c, buf, size))
1766 die("corrupt commit");
1767}
1768
1769static void check_tag(const void *buf, size_t size)
1770{
1771 struct tag t;
1772 memset(&t, 0, sizeof(t));
1773 if (parse_tag_buffer(&t, buf, size))
1774 die("corrupt tag");
1775}
1776
bcd29864 1777static int index_mem(struct object_id *oid, void *buf, size_t size,
c4ce46fc
JH
1778 enum object_type type,
1779 const char *path, unsigned flags)
e7332f96 1780{
6c510bee 1781 int ret, re_allocated = 0;
c4ce46fc 1782 int write_object = flags & HASH_WRITE_OBJECT;
74400e71 1783
7672db20 1784 if (!type)
edaec3fb 1785 type = OBJ_BLOB;
6c510bee
LT
1786
1787 /*
1788 * Convert blobs to git internal format
1789 */
43df4f86 1790 if ((type == OBJ_BLOB) && path) {
f285a2d7 1791 struct strbuf nbuf = STRBUF_INIT;
82b474e0 1792 if (convert_to_git(&the_index, path, buf, size, &nbuf,
8462ff43 1793 get_conv_flags(flags))) {
b315c5c0 1794 buf = strbuf_detach(&nbuf, &size);
6c510bee
LT
1795 re_allocated = 1;
1796 }
1797 }
c4ce46fc 1798 if (flags & HASH_FORMAT_CHECK) {
c879daa2
NTND
1799 if (type == OBJ_TREE)
1800 check_tree(buf, size);
1801 if (type == OBJ_COMMIT)
1802 check_commit(buf, size);
1803 if (type == OBJ_TAG)
1804 check_tag(buf, size);
1805 }
6c510bee 1806
7672db20 1807 if (write_object)
bcd29864 1808 ret = write_sha1_file(buf, size, typename(type), oid->hash);
abdc3fc8 1809 else
bcd29864 1810 ret = hash_sha1_file(buf, size, typename(type), oid->hash);
43df4f86 1811 if (re_allocated)
6c510bee 1812 free(buf);
43df4f86
DP
1813 return ret;
1814}
1815
bcd29864 1816static int index_stream_convert_blob(struct object_id *oid, int fd,
9035d75a
SP
1817 const char *path, unsigned flags)
1818{
1819 int ret;
1820 const int write_object = flags & HASH_WRITE_OBJECT;
1821 struct strbuf sbuf = STRBUF_INIT;
1822
1823 assert(path);
1824 assert(would_convert_to_git_filter_fd(path));
1825
d6c41c20 1826 convert_to_git_filter_fd(&the_index, path, fd, &sbuf,
8462ff43 1827 get_conv_flags(flags));
9035d75a
SP
1828
1829 if (write_object)
1830 ret = write_sha1_file(sbuf.buf, sbuf.len, typename(OBJ_BLOB),
bcd29864 1831 oid->hash);
9035d75a
SP
1832 else
1833 ret = hash_sha1_file(sbuf.buf, sbuf.len, typename(OBJ_BLOB),
bcd29864 1834 oid->hash);
9035d75a
SP
1835 strbuf_release(&sbuf);
1836 return ret;
1837}
1838
bcd29864 1839static int index_pipe(struct object_id *oid, int fd, enum object_type type,
7b41e1e1
JH
1840 const char *path, unsigned flags)
1841{
1842 struct strbuf sbuf = STRBUF_INIT;
1843 int ret;
1844
1845 if (strbuf_read(&sbuf, fd, 4096) >= 0)
bcd29864 1846 ret = index_mem(oid, sbuf.buf, sbuf.len, type, path, flags);
7b41e1e1
JH
1847 else
1848 ret = -1;
1849 strbuf_release(&sbuf);
1850 return ret;
1851}
1852
ea68b0ce
DP
1853#define SMALL_FILE_SIZE (32*1024)
1854
bcd29864 1855static int index_core(struct object_id *oid, int fd, size_t size,
7b41e1e1
JH
1856 enum object_type type, const char *path,
1857 unsigned flags)
43df4f86
DP
1858{
1859 int ret;
43df4f86 1860
7b41e1e1 1861 if (!size) {
bcd29864 1862 ret = index_mem(oid, "", size, type, path, flags);
ea68b0ce
DP
1863 } else if (size <= SMALL_FILE_SIZE) {
1864 char *buf = xmalloc(size);
90dca671
JK
1865 ssize_t read_result = read_in_full(fd, buf, size);
1866 if (read_result < 0)
1867 ret = error_errno("read error while indexing %s",
1868 path ? path : "<unknown>");
1869 else if (read_result != size)
1870 ret = error("short read while indexing %s",
1871 path ? path : "<unknown>");
ea68b0ce 1872 else
bcd29864 1873 ret = index_mem(oid, buf, size, type, path, flags);
ea68b0ce 1874 free(buf);
08bda208 1875 } else {
43df4f86 1876 void *buf = xmmap(NULL, size, PROT_READ, MAP_PRIVATE, fd, 0);
bcd29864 1877 ret = index_mem(oid, buf, size, type, path, flags);
aac17941 1878 munmap(buf, size);
08bda208 1879 }
7b41e1e1
JH
1880 return ret;
1881}
1882
4dd1fbc7 1883/*
568508e7
JH
1884 * This creates one packfile per large blob unless bulk-checkin
1885 * machinery is "plugged".
4dd1fbc7
JH
1886 *
1887 * This also bypasses the usual "convert-to-git" dance, and that is on
1888 * purpose. We could write a streaming version of the converting
1889 * functions and insert that before feeding the data to fast-import
4f22b101
JK
1890 * (or equivalent in-core API described above). However, that is
1891 * somewhat complicated, as we do not know the size of the filter
1892 * result, which we need to know beforehand when writing a git object.
1893 * Since the primary motivation for trying to stream from the working
1894 * tree file and to avoid mmaping it in core is to deal with large
1895 * binary blobs, they generally do not want to get any conversion, and
1896 * callers should avoid this code path when filters are requested.
4dd1fbc7 1897 */
7d5e1dc3 1898static int index_stream(struct object_id *oid, int fd, size_t size,
4dd1fbc7
JH
1899 enum object_type type, const char *path,
1900 unsigned flags)
1901{
7d5e1dc3 1902 return index_bulk_checkin(oid->hash, fd, size, type, path, flags);
4dd1fbc7
JH
1903}
1904
e3506559 1905int index_fd(struct object_id *oid, int fd, struct stat *st,
7b41e1e1
JH
1906 enum object_type type, const char *path, unsigned flags)
1907{
1908 int ret;
7b41e1e1 1909
9079ab7c
SP
1910 /*
1911 * Call xsize_t() only when needed to avoid potentially unnecessary
1912 * die() for large files.
1913 */
9035d75a 1914 if (type == OBJ_BLOB && path && would_convert_to_git_filter_fd(path))
bcd29864 1915 ret = index_stream_convert_blob(oid, fd, path, flags);
9035d75a 1916 else if (!S_ISREG(st->st_mode))
bcd29864 1917 ret = index_pipe(oid, fd, type, path, flags);
9079ab7c 1918 else if (st->st_size <= big_file_threshold || type != OBJ_BLOB ||
82b474e0 1919 (path && would_convert_to_git(&the_index, path)))
bcd29864 1920 ret = index_core(oid, fd, xsize_t(st->st_size), type, path,
9079ab7c 1921 flags);
4dd1fbc7 1922 else
7d5e1dc3 1923 ret = index_stream(oid, fd, xsize_t(st->st_size), type, path,
9079ab7c 1924 flags);
43df4f86 1925 close(fd);
aac17941 1926 return ret;
74400e71 1927}
ec1fcc16 1928
98e019b0 1929int index_path(struct object_id *oid, const char *path, struct stat *st, unsigned flags)
ec1fcc16
JH
1930{
1931 int fd;
b760d3aa 1932 struct strbuf sb = STRBUF_INIT;
ea8e0297 1933 int rc = 0;
ec1fcc16
JH
1934
1935 switch (st->st_mode & S_IFMT) {
1936 case S_IFREG:
1937 fd = open(path, O_RDONLY);
1938 if (fd < 0)
7616c6ca 1939 return error_errno("open(\"%s\")", path);
e3506559 1940 if (index_fd(oid, fd, st, OBJ_BLOB, path, flags) < 0)
ec1fcc16
JH
1941 return error("%s: failed to insert into database",
1942 path);
1943 break;
1944 case S_IFLNK:
7616c6ca
NTND
1945 if (strbuf_readlink(&sb, path, st->st_size))
1946 return error_errno("readlink(\"%s\")", path);
c4ce46fc 1947 if (!(flags & HASH_WRITE_OBJECT))
98e019b0
PO
1948 hash_sha1_file(sb.buf, sb.len, blob_type, oid->hash);
1949 else if (write_sha1_file(sb.buf, sb.len, blob_type, oid->hash))
ea8e0297 1950 rc = error("%s: failed to insert into database", path);
b760d3aa 1951 strbuf_release(&sb);
ec1fcc16 1952 break;
f35a6d3b 1953 case S_IFDIR:
a98e6101 1954 return resolve_gitlink_ref(path, "HEAD", oid);
ec1fcc16
JH
1955 default:
1956 return error("%s: unsupported file type", path);
1957 }
ea8e0297 1958 return rc;
ec1fcc16 1959}
a69e5429
JH
1960
1961int read_pack_header(int fd, struct pack_header *header)
1962{
f48ecd38 1963 if (read_in_full(fd, header, sizeof(*header)) != sizeof(*header))
c697ad14
HO
1964 /* "eof before pack header was fully read" */
1965 return PH_ERROR_EOF;
1966
a69e5429
JH
1967 if (header->hdr_signature != htonl(PACK_SIGNATURE))
1968 /* "protocol error (pack signature mismatch detected)" */
1969 return PH_ERROR_PACK_SIGNATURE;
1970 if (!pack_version_ok(header->hdr_version))
1971 /* "protocol error (pack version unsupported)" */
1972 return PH_ERROR_PROTOCOL;
1973 return 0;
1974}
40d52ff7
JK
1975
1976void assert_sha1_type(const unsigned char *sha1, enum object_type expect)
1977{
1978 enum object_type type = sha1_object_info(sha1, NULL);
1979 if (type < 0)
1980 die("%s is not a valid object", sha1_to_hex(sha1));
1981 if (type != expect)
1982 die("%s is not a valid '%s' object", sha1_to_hex(sha1),
1983 typename(expect));
1984}
27e1e22d 1985
70c49050 1986int for_each_file_in_obj_subdir(unsigned int subdir_nr,
cc817ca3
RS
1987 struct strbuf *path,
1988 each_loose_object_fn obj_cb,
1989 each_loose_cruft_fn cruft_cb,
1990 each_loose_subdir_fn subdir_cb,
1991 void *data)
27e1e22d 1992{
0375f472
RS
1993 size_t origlen, baselen;
1994 DIR *dir;
27e1e22d
JK
1995 struct dirent *de;
1996 int r = 0;
62a24c89 1997 struct object_id oid;
27e1e22d 1998
70c49050
RS
1999 if (subdir_nr > 0xff)
2000 BUG("invalid loose object subdirectory: %x", subdir_nr);
2001
0375f472
RS
2002 origlen = path->len;
2003 strbuf_complete(path, '/');
2004 strbuf_addf(path, "%02x", subdir_nr);
0375f472
RS
2005
2006 dir = opendir(path->buf);
27e1e22d 2007 if (!dir) {
0375f472
RS
2008 if (errno != ENOENT)
2009 r = error_errno("unable to open %s", path->buf);
2010 strbuf_setlen(path, origlen);
2011 return r;
27e1e22d
JK
2012 }
2013
62a24c89 2014 oid.hash[0] = subdir_nr;
163ee5e6
DS
2015 strbuf_addch(path, '/');
2016 baselen = path->len;
62a24c89 2017
27e1e22d 2018 while ((de = readdir(dir))) {
163ee5e6 2019 size_t namelen;
27e1e22d
JK
2020 if (is_dot_or_dotdot(de->d_name))
2021 continue;
2022
163ee5e6 2023 namelen = strlen(de->d_name);
27e1e22d 2024 strbuf_setlen(path, baselen);
163ee5e6
DS
2025 strbuf_add(path, de->d_name, namelen);
2026 if (namelen == GIT_SHA1_HEXSZ - 2 &&
62a24c89
RS
2027 !hex_to_bytes(oid.hash + 1, de->d_name,
2028 GIT_SHA1_RAWSZ - 1)) {
2029 if (obj_cb) {
2030 r = obj_cb(&oid, path->buf, data);
2031 if (r)
2032 break;
27e1e22d 2033 }
62a24c89 2034 continue;
27e1e22d
JK
2035 }
2036
2037 if (cruft_cb) {
2038 r = cruft_cb(de->d_name, path->buf, data);
2039 if (r)
2040 break;
2041 }
2042 }
094c7e63 2043 closedir(dir);
27e1e22d 2044
163ee5e6 2045 strbuf_setlen(path, baselen - 1);
27e1e22d
JK
2046 if (!r && subdir_cb)
2047 r = subdir_cb(subdir_nr, path->buf, data);
2048
0375f472
RS
2049 strbuf_setlen(path, origlen);
2050
27e1e22d
JK
2051 return r;
2052}
2053
e6f875e0 2054int for_each_loose_file_in_objdir_buf(struct strbuf *path,
27e1e22d
JK
2055 each_loose_object_fn obj_cb,
2056 each_loose_cruft_fn cruft_cb,
2057 each_loose_subdir_fn subdir_cb,
2058 void *data)
2059{
27e1e22d
JK
2060 int r = 0;
2061 int i;
2062
27e1e22d 2063 for (i = 0; i < 256; i++) {
e6f875e0 2064 r = for_each_file_in_obj_subdir(i, path, obj_cb, cruft_cb,
27e1e22d 2065 subdir_cb, data);
27e1e22d
JK
2066 if (r)
2067 break;
2068 }
2069
e6f875e0
JK
2070 return r;
2071}
2072
2073int for_each_loose_file_in_objdir(const char *path,
2074 each_loose_object_fn obj_cb,
2075 each_loose_cruft_fn cruft_cb,
2076 each_loose_subdir_fn subdir_cb,
2077 void *data)
2078{
2079 struct strbuf buf = STRBUF_INIT;
2080 int r;
2081
2082 strbuf_addstr(&buf, path);
2083 r = for_each_loose_file_in_objdir_buf(&buf, obj_cb, cruft_cb,
2084 subdir_cb, data);
27e1e22d 2085 strbuf_release(&buf);
e6f875e0 2086
27e1e22d
JK
2087 return r;
2088}
660c889e
JK
2089
2090struct loose_alt_odb_data {
2091 each_loose_object_fn *cb;
2092 void *data;
2093};
2094
2095static int loose_from_alt_odb(struct alternate_object_database *alt,
2096 void *vdata)
2097{
2098 struct loose_alt_odb_data *data = vdata;
b0a42642
JM
2099 struct strbuf buf = STRBUF_INIT;
2100 int r;
2101
597f9134 2102 strbuf_addstr(&buf, alt->path);
b0a42642
JM
2103 r = for_each_loose_file_in_objdir_buf(&buf,
2104 data->cb, NULL, NULL,
2105 data->data);
2106 strbuf_release(&buf);
2107 return r;
660c889e
JK
2108}
2109
1385bb7b 2110int for_each_loose_object(each_loose_object_fn cb, void *data, unsigned flags)
660c889e
JK
2111{
2112 struct loose_alt_odb_data alt;
2113 int r;
2114
2115 r = for_each_loose_file_in_objdir(get_object_directory(),
2116 cb, NULL, NULL, data);
2117 if (r)
2118 return r;
2119
1385bb7b
JK
2120 if (flags & FOR_EACH_OBJECT_LOCAL_ONLY)
2121 return 0;
2122
660c889e
JK
2123 alt.cb = cb;
2124 alt.data = data;
2125 return foreach_alt_odb(loose_from_alt_odb, &alt);
2126}
2127
f6371f92
JK
2128static int check_stream_sha1(git_zstream *stream,
2129 const char *hdr,
2130 unsigned long size,
2131 const char *path,
2132 const unsigned char *expected_sha1)
2133{
2134 git_SHA_CTX c;
cd02599c 2135 unsigned char real_sha1[GIT_MAX_RAWSZ];
f6371f92
JK
2136 unsigned char buf[4096];
2137 unsigned long total_read;
2138 int status = Z_OK;
2139
2140 git_SHA1_Init(&c);
2141 git_SHA1_Update(&c, hdr, stream->total_out);
2142
2143 /*
2144 * We already read some bytes into hdr, but the ones up to the NUL
2145 * do not count against the object's content size.
2146 */
2147 total_read = stream->total_out - strlen(hdr) - 1;
2148
2149 /*
2150 * This size comparison must be "<=" to read the final zlib packets;
2151 * see the comment in unpack_sha1_rest for details.
2152 */
2153 while (total_read <= size &&
2154 (status == Z_OK || status == Z_BUF_ERROR)) {
2155 stream->next_out = buf;
2156 stream->avail_out = sizeof(buf);
2157 if (size - total_read < stream->avail_out)
2158 stream->avail_out = size - total_read;
2159 status = git_inflate(stream, Z_FINISH);
2160 git_SHA1_Update(&c, buf, stream->next_out - buf);
2161 total_read += stream->next_out - buf;
2162 }
2163 git_inflate_end(stream);
2164
2165 if (status != Z_STREAM_END) {
2166 error("corrupt loose object '%s'", sha1_to_hex(expected_sha1));
2167 return -1;
2168 }
cce044df
JK
2169 if (stream->avail_in) {
2170 error("garbage at end of loose object '%s'",
2171 sha1_to_hex(expected_sha1));
2172 return -1;
2173 }
f6371f92
JK
2174
2175 git_SHA1_Final(real_sha1, &c);
2176 if (hashcmp(expected_sha1, real_sha1)) {
2177 error("sha1 mismatch for %s (expected %s)", path,
2178 sha1_to_hex(expected_sha1));
2179 return -1;
2180 }
2181
2182 return 0;
2183}
2184
2185int read_loose_object(const char *path,
2186 const unsigned char *expected_sha1,
2187 enum object_type *type,
2188 unsigned long *size,
2189 void **contents)
2190{
2191 int ret = -1;
f6371f92
JK
2192 void *map = NULL;
2193 unsigned long mapsize;
2194 git_zstream stream;
2195 char hdr[32];
2196
2197 *contents = NULL;
2198
2199 map = map_sha1_file_1(path, NULL, &mapsize);
2200 if (!map) {
2201 error_errno("unable to mmap %s", path);
2202 goto out;
2203 }
2204
2205 if (unpack_sha1_header(&stream, map, mapsize, hdr, sizeof(hdr)) < 0) {
2206 error("unable to unpack header of %s", path);
2207 goto out;
2208 }
2209
2210 *type = parse_sha1_header(hdr, size);
2211 if (*type < 0) {
2212 error("unable to parse header of %s", path);
2213 git_inflate_end(&stream);
2214 goto out;
2215 }
2216
2217 if (*type == OBJ_BLOB) {
2218 if (check_stream_sha1(&stream, hdr, *size, path, expected_sha1) < 0)
2219 goto out;
2220 } else {
2221 *contents = unpack_sha1_rest(&stream, hdr, *size, expected_sha1);
2222 if (!*contents) {
2223 error("unable to unpack contents of %s", path);
2224 git_inflate_end(&stream);
2225 goto out;
2226 }
2227 if (check_sha1_signature(expected_sha1, *contents,
2228 *size, typename(*type))) {
2229 error("sha1 mismatch for %s (expected %s)", path,
2230 sha1_to_hex(expected_sha1));
2231 free(*contents);
2232 goto out;
2233 }
2234 }
2235
2236 ret = 0; /* everything checks out */
2237
2238out:
2239 if (map)
2240 munmap(map, mapsize);
f6371f92
JK
2241 return ret;
2242}