tree-walk: convert tree entry functions to object_id
[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"
12d95ef6 27#include "list.h"
c4c6effa 28#include "mergesort.h"
cf3c6352 29#include "quote.h"
4f39cd82 30#include "packfile.h"
8b4c0103 31#include "fetch-object.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
ac73cedf 42static void git_hash_sha1_init(git_hash_ctx *ctx)
f50e766b 43{
ac73cedf 44 git_SHA1_Init(&ctx->sha1);
f50e766b 45}
46
ac73cedf 47static void git_hash_sha1_update(git_hash_ctx *ctx, const void *data, size_t len)
f50e766b 48{
ac73cedf 49 git_SHA1_Update(&ctx->sha1, data, len);
f50e766b 50}
51
ac73cedf 52static void git_hash_sha1_final(unsigned char *hash, git_hash_ctx *ctx)
f50e766b 53{
ac73cedf 54 git_SHA1_Final(hash, &ctx->sha1);
f50e766b 55}
56
ac73cedf 57static void git_hash_unknown_init(git_hash_ctx *ctx)
f50e766b 58{
59 die("trying to init unknown hash");
60}
61
ac73cedf 62static void git_hash_unknown_update(git_hash_ctx *ctx, const void *data, size_t len)
f50e766b 63{
64 die("trying to update unknown hash");
65}
66
ac73cedf 67static void git_hash_unknown_final(unsigned char *hash, git_hash_ctx *ctx)
f50e766b 68{
69 die("trying to finalize unknown hash");
70}
71
72const struct git_hash_algo hash_algos[GIT_HASH_NALGOS] = {
73 {
74 NULL,
75 0x00000000,
76 0,
77 0,
f50e766b 78 git_hash_unknown_init,
79 git_hash_unknown_update,
80 git_hash_unknown_final,
81 NULL,
82 NULL,
83 },
84 {
85 "sha-1",
86 /* "sha1", big-endian */
87 0x73686131,
f50e766b 88 GIT_SHA1_RAWSZ,
89 GIT_SHA1_HEXSZ,
90 git_hash_sha1_init,
91 git_hash_sha1_update,
92 git_hash_sha1_final,
93 &empty_tree_oid,
94 &empty_blob_oid,
95 },
96};
97
c597ba80
NTND
98/*
99 * This is meant to hold a *small* number of objects that you would
100 * want read_sha1_file() to be able to return, but yet you do not want
101 * to write them into the object store (e.g. a browse-only
102 * application).
103 */
104static struct cached_object {
105 unsigned char sha1[20];
106 enum object_type type;
107 void *buf;
108 unsigned long size;
109} *cached_objects;
110static int cached_object_nr, cached_object_alloc;
111
112static struct cached_object empty_tree = {
dab0d410 113 EMPTY_TREE_SHA1_BIN_LITERAL,
c597ba80
NTND
114 OBJ_TREE,
115 "",
116 0
117};
118
119static struct cached_object *find_cached_object(const unsigned char *sha1)
120{
121 int i;
122 struct cached_object *co = cached_objects;
123
124 for (i = 0; i < cached_object_nr; i++, co++) {
125 if (!hashcmp(co->sha1, sha1))
126 return co;
127 }
128 if (!hashcmp(sha1, empty_tree.sha1))
129 return &empty_tree;
130 return NULL;
131}
132
9472935d 133
8462ff43 134static int get_conv_flags(unsigned flags)
9472935d
TB
135{
136 if (flags & HASH_RENORMALIZE)
8462ff43 137 return CONV_EOL_RENORMALIZE;
9472935d 138 else if (flags & HASH_WRITE_OBJECT)
8462ff43 139 return global_conv_flags_eol;
9472935d 140 else
8462ff43 141 return 0;
9472935d
TB
142}
143
144
90a6464b
JH
145int mkdir_in_gitdir(const char *path)
146{
147 if (mkdir(path, 0777)) {
148 int saved_errno = errno;
149 struct stat st;
150 struct strbuf sb = STRBUF_INIT;
151
152 if (errno != EEXIST)
153 return -1;
154 /*
155 * Are we looking at a path in a symlinked worktree
156 * whose original repository does not yet have it?
157 * e.g. .git/rr-cache pointing at its original
158 * repository in which the user hasn't performed any
159 * conflict resolution yet?
160 */
161 if (lstat(path, &st) || !S_ISLNK(st.st_mode) ||
162 strbuf_readlink(&sb, path, st.st_size) ||
163 !is_absolute_path(sb.buf) ||
164 mkdir(sb.buf, 0777)) {
165 strbuf_release(&sb);
166 errno = saved_errno;
167 return -1;
168 }
169 strbuf_release(&sb);
170 }
171 return adjust_shared_perm(path);
172}
173
0be0521b 174enum scld_error safe_create_leading_directories(char *path)
b2cb9425 175{
26c8ae2a 176 char *next_component = path + offset_1st_component(path);
0be0521b 177 enum scld_error ret = SCLD_OK;
67d42212 178
0be0521b 179 while (ret == SCLD_OK && next_component) {
f0502332 180 struct stat st;
0f527403 181 char *slash = next_component, slash_character;
f0502332 182
0f527403
MH
183 while (*slash && !is_dir_sep(*slash))
184 slash++;
185
186 if (!*slash)
b2cb9425 187 break;
bf10cf70 188
26c8ae2a 189 next_component = slash + 1;
0f527403 190 while (is_dir_sep(*next_component))
bf10cf70 191 next_component++;
26c8ae2a 192 if (!*next_component)
5f0bdf50 193 break;
831651fd 194
0f527403 195 slash_character = *slash;
831651fd 196 *slash = '\0';
67d42212
JR
197 if (!stat(path, &st)) {
198 /* path exists */
204a047f
MH
199 if (!S_ISDIR(st.st_mode)) {
200 errno = ENOTDIR;
0be0521b 201 ret = SCLD_EXISTS;
204a047f 202 }
53a39721 203 } else if (mkdir(path, 0777)) {
928734d9 204 if (errno == EEXIST &&
9e6f885d 205 !stat(path, &st) && S_ISDIR(st.st_mode))
928734d9 206 ; /* somebody created it since we checked */
18d37e86
MH
207 else if (errno == ENOENT)
208 /*
209 * Either mkdir() failed because
210 * somebody just pruned the containing
211 * directory, or stat() failed because
212 * the file that was in our way was
213 * just removed. Either way, inform
214 * the caller that it might be worth
215 * trying again:
216 */
217 ret = SCLD_VANISHED;
9e6f885d 218 else
0be0521b 219 ret = SCLD_FAILED;
53a39721 220 } else if (adjust_shared_perm(path)) {
0be0521b 221 ret = SCLD_PERMS;
457f06d6 222 }
0f527403 223 *slash = slash_character;
b2cb9425 224 }
9e6f885d 225 return ret;
b2cb9425 226}
723c31fe 227
0be0521b 228enum scld_error safe_create_leading_directories_const(const char *path)
8e21d63b 229{
02944307 230 int save_errno;
8e21d63b
JK
231 /* path points to cache entries, so xstrdup before messing with it */
232 char *buf = xstrdup(path);
0be0521b 233 enum scld_error result = safe_create_leading_directories(buf);
02944307
MH
234
235 save_errno = errno;
8e21d63b 236 free(buf);
02944307 237 errno = save_errno;
8e21d63b
JK
238 return result;
239}
240
177978f5
MH
241int raceproof_create_file(const char *path, create_file_fn fn, void *cb)
242{
243 /*
244 * The number of times we will try to remove empty directories
245 * in the way of path. This is only 1 because if another
246 * process is racily creating directories that conflict with
247 * us, we don't want to fight against them.
248 */
249 int remove_directories_remaining = 1;
250
251 /*
252 * The number of times that we will try to create the
253 * directories containing path. We are willing to attempt this
254 * more than once, because another process could be trying to
255 * clean up empty directories at the same time as we are
256 * trying to create them.
257 */
258 int create_directories_remaining = 3;
259
260 /* A scratch copy of path, filled lazily if we need it: */
261 struct strbuf path_copy = STRBUF_INIT;
262
263 int ret, save_errno;
264
265 /* Sanity check: */
266 assert(*path);
267
268retry_fn:
269 ret = fn(path, cb);
270 save_errno = errno;
271 if (!ret)
272 goto out;
273
274 if (errno == EISDIR && remove_directories_remaining-- > 0) {
275 /*
276 * A directory is in the way. Maybe it is empty; try
277 * to remove it:
278 */
279 if (!path_copy.len)
280 strbuf_addstr(&path_copy, path);
281
282 if (!remove_dir_recursively(&path_copy, REMOVE_DIR_EMPTY_ONLY))
283 goto retry_fn;
284 } else if (errno == ENOENT && create_directories_remaining-- > 0) {
285 /*
286 * Maybe the containing directory didn't exist, or
287 * maybe it was just deleted by a process that is
288 * racing with us to clean up empty directories. Try
289 * to create it:
290 */
291 enum scld_error scld_result;
292
293 if (!path_copy.len)
294 strbuf_addstr(&path_copy, path);
295
296 do {
297 scld_result = safe_create_leading_directories(path_copy.buf);
298 if (scld_result == SCLD_OK)
299 goto retry_fn;
300 } while (scld_result == SCLD_VANISHED && create_directories_remaining-- > 0);
301 }
302
303out:
304 strbuf_release(&path_copy);
305 errno = save_errno;
306 return ret;
307}
308
f7b7774f 309static void fill_sha1_path(struct strbuf *buf, const unsigned char *sha1)
ace1534d
JH
310{
311 int i;
312 for (i = 0; i < 20; i++) {
313 static char hex[] = "0123456789abcdef";
314 unsigned int val = sha1[i];
f7b7774f
JK
315 strbuf_addch(buf, hex[val >> 4]);
316 strbuf_addch(buf, hex[val & 0xf]);
afbba2f0 317 if (!i)
f7b7774f 318 strbuf_addch(buf, '/');
ace1534d
JH
319 }
320}
321
ea657730 322void sha1_file_name(struct strbuf *buf, const unsigned char *sha1)
0fcfd160 323{
34498471
CC
324 strbuf_addstr(buf, get_object_directory());
325 strbuf_addch(buf, '/');
ea657730 326 fill_sha1_path(buf, sha1);
0fcfd160
LT
327}
328
38dbe5f0
JK
329struct strbuf *alt_scratch_buf(struct alternate_object_database *alt)
330{
331 strbuf_setlen(&alt->scratch, alt->base_len);
332 return &alt->scratch;
333}
334
29ec6af2
JK
335static const char *alt_sha1_path(struct alternate_object_database *alt,
336 const unsigned char *sha1)
337{
38dbe5f0 338 struct strbuf *buf = alt_scratch_buf(alt);
f7b7774f 339 fill_sha1_path(buf, sha1);
38dbe5f0 340 return buf->buf;
0fcfd160
LT
341}
342
d5a63b99
JH
343struct alternate_object_database *alt_odb_list;
344static struct alternate_object_database **alt_odb_tail;
ace1534d 345
4ea82473
JK
346/*
347 * Return non-zero iff the path is usable as an alternate object database.
348 */
349static int alt_odb_usable(struct strbuf *path, const char *normalized_objdir)
350{
351 struct alternate_object_database *alt;
352
353 /* Detect cases where alternate disappeared */
354 if (!is_directory(path->buf)) {
355 error("object directory %s does not exist; "
356 "check .git/objects/info/alternates.",
357 path->buf);
358 return 0;
359 }
360
361 /*
362 * Prevent the common mistake of listing the same
363 * thing twice, or object directory itself.
364 */
365 for (alt = alt_odb_list; alt; alt = alt->next) {
ea0fc3b4 366 if (!fspathcmp(path->buf, alt->path))
4ea82473
JK
367 return 0;
368 }
369 if (!fspathcmp(path->buf, normalized_objdir))
370 return 0;
371
372 return 1;
373}
374
ddd5d056
JH
375/*
376 * Prepare alternate object database registry.
d5a63b99
JH
377 *
378 * The variable alt_odb_list points at the list of struct
379 * alternate_object_database. The elements on this list come from
380 * non-empty elements from colon separated ALTERNATE_DB_ENVIRONMENT
381 * environment variable, and $GIT_OBJECT_DIRECTORY/info/alternates,
1494e038
JH
382 * whose contents is similar to that environment variable but can be
383 * LF separated. Its base points at a statically allocated buffer that
d5a63b99
JH
384 * contains "/the/directory/corresponding/to/.git/objects/...", while
385 * its name points just after the slash at the end of ".git/objects/"
386 * in the example above, and has enough space to hold 40-byte hex
387 * SHA1, an extra slash for the first level indirection, and the
388 * terminating NUL.
ddd5d056 389 */
2456990d 390static void read_info_alternates(const char * relative_base, int depth);
539e7506
EK
391static int link_alt_odb_entry(const char *entry, const char *relative_base,
392 int depth, const char *normalized_objdir)
ace1534d 393{
c2f493a4 394 struct alternate_object_database *ent;
5bdf0a84 395 struct strbuf pathbuf = STRBUF_INIT;
d5a63b99 396
85dadc38 397 if (!is_absolute_path(entry) && relative_base) {
4ac9006f 398 strbuf_realpath(&pathbuf, relative_base, 1);
5bdf0a84 399 strbuf_addch(&pathbuf, '/');
c2f493a4 400 }
6eac50d8 401 strbuf_addstr(&pathbuf, entry);
c2f493a4 402
37a95862 403 if (strbuf_normalize_path(&pathbuf) < 0 && relative_base) {
670c359d
JK
404 error("unable to normalize alternate object path: %s",
405 pathbuf.buf);
406 strbuf_release(&pathbuf);
407 return -1;
408 }
5bdf0a84
HW
409
410 /*
411 * The trailing slash after the directory name is given by
412 * this function at the end. Remove duplicates.
413 */
4ea82473
JK
414 while (pathbuf.len && pathbuf.buf[pathbuf.len - 1] == '/')
415 strbuf_setlen(&pathbuf, pathbuf.len - 1);
5bdf0a84 416
4ea82473
JK
417 if (!alt_odb_usable(&pathbuf, normalized_objdir)) {
418 strbuf_release(&pathbuf);
c2f493a4
MW
419 return -1;
420 }
421
7f0fa2c0 422 ent = alloc_alt_odb(pathbuf.buf);
c2f493a4
MW
423
424 /* add the alternate entry */
425 *alt_odb_tail = ent;
426 alt_odb_tail = &(ent->next);
427 ent->next = NULL;
428
429 /* recursively add alternates */
4ea82473 430 read_info_alternates(pathbuf.buf, depth + 1);
c2f493a4 431
4ea82473 432 strbuf_release(&pathbuf);
c2f493a4
MW
433 return 0;
434}
435
cf3c6352
JK
436static const char *parse_alt_odb_entry(const char *string,
437 int sep,
438 struct strbuf *out)
439{
440 const char *end;
441
442 strbuf_reset(out);
443
444 if (*string == '#') {
445 /* comment; consume up to next separator */
446 end = strchrnul(string, sep);
447 } else if (*string == '"' && !unquote_c_style(out, string, &end)) {
448 /*
449 * quoted path; unquote_c_style has copied the
450 * data for us and set "end". Broken quoting (e.g.,
451 * an entry that doesn't end with a quote) falls
452 * back to the unquoted case below.
453 */
454 } else {
455 /* normal, unquoted path */
456 end = strchrnul(string, sep);
457 strbuf_add(out, string, end - string);
458 }
459
460 if (*end)
461 end++;
462 return end;
463}
464
dc732bd5 465static void link_alt_odb_entries(const char *alt, int sep,
c2f493a4
MW
466 const char *relative_base, int depth)
467{
539e7506 468 struct strbuf objdirbuf = STRBUF_INIT;
cf3c6352 469 struct strbuf entry = STRBUF_INIT;
c2f493a4 470
f28e3668
JK
471 if (!alt || !*alt)
472 return;
473
c2f493a4
MW
474 if (depth > 5) {
475 error("%s: ignoring alternate object stores, nesting too deep.",
476 relative_base);
477 return;
478 }
479
f655651e 480 strbuf_add_absolute_path(&objdirbuf, get_object_directory());
670c359d
JK
481 if (strbuf_normalize_path(&objdirbuf) < 0)
482 die("unable to normalize object directory: %s",
483 objdirbuf.buf);
539e7506 484
cf3c6352
JK
485 while (*alt) {
486 alt = parse_alt_odb_entry(alt, sep, &entry);
487 if (!entry.len)
9577e7e3 488 continue;
cf3c6352 489 link_alt_odb_entry(entry.buf, relative_base, depth, objdirbuf.buf);
9577e7e3 490 }
cf3c6352 491 strbuf_release(&entry);
539e7506 492 strbuf_release(&objdirbuf);
d5a63b99
JH
493}
494
2456990d 495static void read_info_alternates(const char * relative_base, int depth)
d5a63b99 496{
5015f01c 497 char *path;
dc732bd5 498 struct strbuf buf = STRBUF_INIT;
d5a63b99 499
5015f01c 500 path = xstrfmt("%s/info/alternates", relative_base);
dc732bd5 501 if (strbuf_read_file(&buf, path, 1024) < 0) {
f0f7bebe 502 warn_on_fopen_errors(path);
dc732bd5 503 free(path);
9a217f2a 504 return;
ace1534d 505 }
d5a63b99 506
dc732bd5
JK
507 link_alt_odb_entries(buf.buf, '\n', relative_base, depth);
508 strbuf_release(&buf);
509 free(path);
ace1534d
JH
510}
511
7f0fa2c0
JK
512struct alternate_object_database *alloc_alt_odb(const char *dir)
513{
514 struct alternate_object_database *ent;
7f0fa2c0 515
597f9134 516 FLEX_ALLOC_STR(ent, path, dir);
38dbe5f0
JK
517 strbuf_init(&ent->scratch, 0);
518 strbuf_addf(&ent->scratch, "%s/", dir);
519 ent->base_len = ent->scratch.len;
7f0fa2c0
JK
520
521 return ent;
522}
523
bef70b22
DB
524void add_to_alternates_file(const char *reference)
525{
f132a127 526 struct lock_file lock = LOCK_INIT;
77b9b1d1
JK
527 char *alts = git_pathdup("objects/info/alternates");
528 FILE *in, *out;
f132a127 529 int found = 0;
77b9b1d1 530
f132a127
531 hold_lock_file_for_update(&lock, alts, LOCK_DIE_ON_ERROR);
532 out = fdopen_lock_file(&lock, "w");
77b9b1d1
JK
533 if (!out)
534 die_errno("unable to fdopen alternates lockfile");
535
536 in = fopen(alts, "r");
537 if (in) {
538 struct strbuf line = STRBUF_INIT;
77b9b1d1 539
3f163962 540 while (strbuf_getline(&line, in) != EOF) {
77b9b1d1
JK
541 if (!strcmp(reference, line.buf)) {
542 found = 1;
543 break;
544 }
545 fprintf_or_die(out, "%s\n", line.buf);
546 }
547
548 strbuf_release(&line);
549 fclose(in);
77b9b1d1
JK
550 }
551 else if (errno != ENOENT)
552 die_errno("unable to read alternates file");
553
f132a127
554 if (found) {
555 rollback_lock_file(&lock);
556 } else {
77b9b1d1 557 fprintf_or_die(out, "%s\n", reference);
f132a127 558 if (commit_lock_file(&lock))
77b9b1d1
JK
559 die_errno("unable to move new alternates file into place");
560 if (alt_odb_tail)
dc732bd5 561 link_alt_odb_entries(reference, '\n', NULL, 0);
77b9b1d1
JK
562 }
563 free(alts);
bef70b22
DB
564}
565
a5b34d21
JK
566void add_to_alternates_memory(const char *reference)
567{
568 /*
569 * Make sure alternates are initialized, or else our entry may be
570 * overwritten when they are.
571 */
572 prepare_alt_odb();
573
dc732bd5 574 link_alt_odb_entries(reference, '\n', NULL, 0);
a5b34d21
JK
575}
576
9eeea7d2
SB
577/*
578 * Compute the exact path an alternate is at and returns it. In case of
579 * error NULL is returned and the human readable error is added to `err`
580 * `path` may be relative and should point to $GITDIR.
581 * `err` must not be null.
582 */
583char *compute_alternate_path(const char *path, struct strbuf *err)
584{
585 char *ref_git = NULL;
586 const char *repo, *ref_git_s;
587 int seen_error = 0;
588
589 ref_git_s = real_path_if_valid(path);
590 if (!ref_git_s) {
591 seen_error = 1;
592 strbuf_addf(err, _("path '%s' does not exist"), path);
593 goto out;
594 } else
595 /*
596 * Beware: read_gitfile(), real_path() and mkpath()
597 * return static buffer
598 */
599 ref_git = xstrdup(ref_git_s);
600
601 repo = read_gitfile(ref_git);
602 if (!repo)
603 repo = read_gitfile(mkpath("%s/.git", ref_git));
604 if (repo) {
605 free(ref_git);
606 ref_git = xstrdup(repo);
607 }
608
609 if (!repo && is_directory(mkpath("%s/.git/objects", ref_git))) {
610 char *ref_git_git = mkpathdup("%s/.git", ref_git);
611 free(ref_git);
612 ref_git = ref_git_git;
613 } else if (!is_directory(mkpath("%s/objects", ref_git))) {
614 struct strbuf sb = STRBUF_INIT;
615 seen_error = 1;
616 if (get_common_dir(&sb, ref_git)) {
617 strbuf_addf(err,
618 _("reference repository '%s' as a linked "
619 "checkout is not supported yet."),
620 path);
621 goto out;
622 }
623
624 strbuf_addf(err, _("reference repository '%s' is not a "
625 "local repository."), path);
626 goto out;
627 }
628
629 if (!access(mkpath("%s/shallow", ref_git), F_OK)) {
630 strbuf_addf(err, _("reference repository '%s' is shallow"),
631 path);
632 seen_error = 1;
633 goto out;
634 }
635
636 if (!access(mkpath("%s/info/grafts", ref_git), F_OK)) {
637 strbuf_addf(err,
638 _("reference repository '%s' is grafted"),
639 path);
640 seen_error = 1;
641 goto out;
642 }
643
644out:
645 if (seen_error) {
6a83d902 646 FREE_AND_NULL(ref_git);
9eeea7d2
SB
647 }
648
649 return ref_git;
650}
651
fe1b2268 652int foreach_alt_odb(alt_odb_fn fn, void *cb)
d79796bc
JH
653{
654 struct alternate_object_database *ent;
fe1b2268 655 int r = 0;
d79796bc
JH
656
657 prepare_alt_odb();
fe1b2268
JK
658 for (ent = alt_odb_list; ent; ent = ent->next) {
659 r = fn(ent, cb);
660 if (r)
661 break;
662 }
663 return r;
d79796bc
JH
664}
665
c2f493a4
MW
666void prepare_alt_odb(void)
667{
554fe20d 668 const char *alt;
c2f493a4 669
7dc24aa5
SP
670 if (alt_odb_tail)
671 return;
672
c2f493a4 673 alt = getenv(ALTERNATE_DB_ENVIRONMENT);
c2f493a4 674
c2f493a4 675 alt_odb_tail = &alt_odb_list;
dc732bd5 676 link_alt_odb_entries(alt, PATH_SEP, NULL, 0);
c2f493a4
MW
677
678 read_info_alternates(get_object_directory(), 0);
679}
680
3096b2ec 681/* Returns 1 if we have successfully freshened the file, 0 otherwise. */
33d4221c 682static int freshen_file(const char *fn)
ace1534d 683{
33d4221c
JK
684 struct utimbuf t;
685 t.actime = t.modtime = time(NULL);
686 return !utime(fn, &t);
0f4dc14a 687}
ace1534d 688
3096b2ec
JK
689/*
690 * All of the check_and_freshen functions return 1 if the file exists and was
691 * freshened (if freshening was requested), 0 otherwise. If they return
692 * 0, you should not assume that it is safe to skip a write of the object (it
693 * either does not exist on disk, or has a stale mtime and may be subject to
694 * pruning).
695 */
6a5e6f5e 696int check_and_freshen_file(const char *fn, int freshen)
33d4221c
JK
697{
698 if (access(fn, F_OK))
699 return 0;
3096b2ec 700 if (freshen && !freshen_file(fn))
33d4221c
JK
701 return 0;
702 return 1;
703}
704
705static int check_and_freshen_local(const unsigned char *sha1, int freshen)
706{
ea657730
CC
707 static struct strbuf buf = STRBUF_INIT;
708
709 strbuf_reset(&buf);
710 sha1_file_name(&buf, sha1);
711
712 return check_and_freshen_file(buf.buf, freshen);
33d4221c
JK
713}
714
715static int check_and_freshen_nonlocal(const unsigned char *sha1, int freshen)
0f4dc14a
BC
716{
717 struct alternate_object_database *alt;
9a217f2a 718 prepare_alt_odb();
d5a63b99 719 for (alt = alt_odb_list; alt; alt = alt->next) {
29ec6af2
JK
720 const char *path = alt_sha1_path(alt, sha1);
721 if (check_and_freshen_file(path, freshen))
c529d75a 722 return 1;
ace1534d 723 }
c529d75a 724 return 0;
ace1534d
JH
725}
726
33d4221c
JK
727static int check_and_freshen(const unsigned char *sha1, int freshen)
728{
729 return check_and_freshen_local(sha1, freshen) ||
730 check_and_freshen_nonlocal(sha1, freshen);
731}
732
733int has_loose_object_nonlocal(const unsigned char *sha1)
734{
735 return check_and_freshen_nonlocal(sha1, 0);
736}
737
0f4dc14a
BC
738static int has_loose_object(const unsigned char *sha1)
739{
33d4221c 740 return check_and_freshen(sha1, 0);
0f4dc14a
BC
741}
742
02710228
SP
743static void mmap_limit_check(size_t length)
744{
745 static size_t limit = 0;
746 if (!limit) {
747 limit = git_env_ulong("GIT_MMAP_LIMIT", 0);
748 if (!limit)
749 limit = SIZE_MAX;
750 }
751 if (length > limit)
752 die("attempting to mmap %"PRIuMAX" over limit %"PRIuMAX,
753 (uintmax_t)length, (uintmax_t)limit);
754}
755
1570856b
JK
756void *xmmap_gently(void *start, size_t length,
757 int prot, int flags, int fd, off_t offset)
58ecbd5e 758{
02710228
SP
759 void *ret;
760
761 mmap_limit_check(length);
762 ret = mmap(start, length, prot, flags, fd, offset);
58ecbd5e
JN
763 if (ret == MAP_FAILED) {
764 if (!length)
765 return NULL;
7c3ecb32 766 release_pack_memory(length);
58ecbd5e 767 ret = mmap(start, length, prot, flags, fd, offset);
58ecbd5e
JN
768 }
769 return ret;
770}
771
1570856b
JK
772void *xmmap(void *start, size_t length,
773 int prot, int flags, int fd, off_t offset)
774{
775 void *ret = xmmap_gently(start, length, prot, flags, fd, offset);
776 if (ret == MAP_FAILED)
9ca0aaf6 777 die_errno("mmap failed");
1570856b
JK
778 return ret;
779}
780
88d0db55 781/*
090ea126
NTND
782 * With an in-core object data in "map", rehash it to make sure the
783 * object name actually matches "sha1" to detect object corruption.
784 * With "map" == NULL, try reading the object named with "sha1" using
785 * the streaming interface and rehash it to do the same.
88d0db55 786 */
17e65451 787int check_object_signature(const struct object_id *oid, void *map,
788 unsigned long size, const char *type)
88d0db55 789{
f070facc 790 struct object_id real_oid;
090ea126
NTND
791 enum object_type obj_type;
792 struct git_istream *st;
18e2588e 793 git_hash_ctx c;
090ea126
NTND
794 char hdr[32];
795 int hdrlen;
88d0db55 796
090ea126 797 if (map) {
f070facc 798 hash_object_file(map, size, type, &real_oid);
17e65451 799 return oidcmp(oid, &real_oid) ? -1 : 0;
88d0db55
BC
800 }
801
ef7b5195 802 st = open_istream(oid, &obj_type, &size, NULL);
090ea126
NTND
803 if (!st)
804 return -1;
88d0db55 805
090ea126 806 /* Generate the header */
debca9d2 807 hdrlen = xsnprintf(hdr, sizeof(hdr), "%s %lu", type_name(obj_type), size) + 1;
88d0db55 808
090ea126 809 /* Sha1.. */
18e2588e 810 the_hash_algo->init_fn(&c);
811 the_hash_algo->update_fn(&c, hdr, hdrlen);
090ea126
NTND
812 for (;;) {
813 char buf[1024 * 16];
814 ssize_t readlen = read_istream(st, buf, sizeof(buf));
1f688557 815
f54fac53
JK
816 if (readlen < 0) {
817 close_istream(st);
818 return -1;
819 }
090ea126
NTND
820 if (!readlen)
821 break;
18e2588e 822 the_hash_algo->update_fn(&c, buf, readlen);
fa5fc15d 823 }
18e2588e 824 the_hash_algo->final_fn(real_oid.hash, &c);
090ea126 825 close_istream(st);
17e65451 826 return oidcmp(oid, &real_oid) ? -1 : 0;
fa5fc15d
SP
827}
828
1b8ac5ea 829int git_open_cloexec(const char *name, int flags)
a0788266 830{
1e3001a8
JH
831 int fd;
832 static int o_cloexec = O_CLOEXEC;
a0788266 833
1e3001a8
JH
834 fd = open(name, flags | o_cloexec);
835 if ((o_cloexec & O_CLOEXEC) && fd < 0 && errno == EINVAL) {
cd66ada0 836 /* Try again w/o O_CLOEXEC: the kernel might not support it */
1e3001a8
JH
837 o_cloexec &= ~O_CLOEXEC;
838 fd = open(name, flags | o_cloexec);
491a8dec 839 }
491a8dec 840
9fb9495d 841#if defined(F_GETFD) && defined(F_SETFD) && defined(FD_CLOEXEC)
491a8dec 842 {
1e3001a8 843 static int fd_cloexec = FD_CLOEXEC;
a0788266 844
1e3001a8
JH
845 if (!o_cloexec && 0 <= fd && fd_cloexec) {
846 /* Opened w/o O_CLOEXEC? try with fcntl(2) to add it */
9fb9495d
EW
847 int flags = fcntl(fd, F_GETFD);
848 if (fcntl(fd, F_SETFD, flags | fd_cloexec))
1e3001a8 849 fd_cloexec = 0;
cd66ada0 850 }
44d1c19e 851 }
a0788266 852#endif
1b8ac5ea 853 return fd;
a0788266
JS
854}
855
3cf8b462 856/*
771e7d57
JK
857 * Find "sha1" as a loose object in the local repository or in an alternate.
858 * Returns 0 on success, negative on failure.
859 *
860 * The "path" out-parameter will give the path of the object we found (if any).
861 * Note that it may point to static storage and is only valid until another
862 * call to sha1_file_name(), etc.
3cf8b462 863 */
771e7d57
JK
864static int stat_sha1_file(const unsigned char *sha1, struct stat *st,
865 const char **path)
1f688557 866{
052fe5ea 867 struct alternate_object_database *alt;
ea657730
CC
868 static struct strbuf buf = STRBUF_INIT;
869
870 strbuf_reset(&buf);
871 sha1_file_name(&buf, sha1);
872 *path = buf.buf;
d079837e 873
771e7d57 874 if (!lstat(*path, st))
052fe5ea 875 return 0;
c7934306 876
052fe5ea
JK
877 prepare_alt_odb();
878 errno = ENOENT;
879 for (alt = alt_odb_list; alt; alt = alt->next) {
771e7d57
JK
880 *path = alt_sha1_path(alt, sha1);
881 if (!lstat(*path, st))
052fe5ea 882 return 0;
c7934306
SP
883 }
884
3cf8b462
SP
885 return -1;
886}
887
771e7d57
JK
888/*
889 * Like stat_sha1_file(), but actually open the object and return the
890 * descriptor. See the caveats on the "path" parameter above.
891 */
892static int open_sha1_file(const unsigned char *sha1, const char **path)
60bb8b14 893{
44d1c19e 894 int fd;
44d1c19e 895 struct alternate_object_database *alt;
d6c8a05b 896 int most_interesting_errno;
ea657730
CC
897 static struct strbuf buf = STRBUF_INIT;
898
899 strbuf_reset(&buf);
900 sha1_file_name(&buf, sha1);
901 *path = buf.buf;
60bb8b14 902
771e7d57 903 fd = git_open(*path);
44d1c19e
LT
904 if (fd >= 0)
905 return fd;
d6c8a05b 906 most_interesting_errno = errno;
03e79c88 907
44d1c19e 908 prepare_alt_odb();
44d1c19e 909 for (alt = alt_odb_list; alt; alt = alt->next) {
771e7d57
JK
910 *path = alt_sha1_path(alt, sha1);
911 fd = git_open(*path);
44d1c19e
LT
912 if (fd >= 0)
913 return fd;
d6c8a05b
JK
914 if (most_interesting_errno == ENOENT)
915 most_interesting_errno = errno;
03e79c88 916 }
d6c8a05b 917 errno = most_interesting_errno;
44d1c19e 918 return -1;
1f688557
JH
919}
920
f6371f92
JK
921/*
922 * Map the loose object at "path" if it is not NULL, or the path found by
923 * searching for a loose object named "sha1".
924 */
925static void *map_sha1_file_1(const char *path,
926 const unsigned char *sha1,
927 unsigned long *size)
27d69a46 928{
0fcfd160 929 void *map;
144bde78 930 int fd;
84dd81c1 931
f6371f92
JK
932 if (path)
933 fd = git_open(path);
8261e1f1 934 else
f6371f92 935 fd = open_sha1_file(sha1, &path);
44d1c19e
LT
936 map = NULL;
937 if (fd >= 0) {
938 struct stat st;
1f688557 939
44d1c19e
LT
940 if (!fstat(fd, &st)) {
941 *size = xsize_t(st.st_size);
33e42de0
MM
942 if (!*size) {
943 /* mmap() is forbidden on empty files */
771e7d57 944 error("object file %s is empty", path);
33e42de0
MM
945 return NULL;
946 }
44d1c19e 947 map = xmmap(NULL, *size, PROT_READ, MAP_PRIVATE, fd, 0);
144bde78 948 }
44d1c19e 949 close(fd);
74e34e1f 950 }
0fcfd160 951 return map;
74e34e1f
NP
952}
953
f6371f92 954void *map_sha1_file(const unsigned char *sha1, unsigned long *size)
068f85e3 955{
f6371f92 956 return map_sha1_file_1(NULL, sha1, size);
068f85e3 957}
958
d21f8426
JH
959static int unpack_sha1_short_header(git_zstream *stream,
960 unsigned char *map, unsigned long mapsize,
961 void *buffer, unsigned long bufsiz)
47fe3f6e 962{
c4483576
LT
963 /* Get the data stream */
964 memset(stream, 0, sizeof(*stream));
965 stream->next_in = map;
966 stream->avail_in = mapsize;
967 stream->next_out = buffer;
93821bd9 968 stream->avail_out = bufsiz;
47fe3f6e 969
39c68542 970 git_inflate_init(stream);
cc5c54e7 971 return git_inflate(stream, 0);
9a217f2a
JH
972}
973
d21f8426
JH
974int unpack_sha1_header(git_zstream *stream,
975 unsigned char *map, unsigned long mapsize,
976 void *buffer, unsigned long bufsiz)
1f688557 977{
d21f8426
JH
978 int status = unpack_sha1_short_header(stream, map, mapsize,
979 buffer, bufsiz);
42873078 980
d21f8426
JH
981 if (status < Z_OK)
982 return status;
628522ec 983
d21f8426
JH
984 /* Make sure we have the terminating NUL */
985 if (!memchr(buffer, '\0', stream->next_out - (unsigned char *)buffer))
986 return -1;
1f688557
JH
987 return 0;
988}
989
46f03448
KN
990static int unpack_sha1_header_to_strbuf(git_zstream *stream, unsigned char *map,
991 unsigned long mapsize, void *buffer,
992 unsigned long bufsiz, struct strbuf *header)
d131b7af 993{
46f03448
KN
994 int status;
995
d21f8426
JH
996 status = unpack_sha1_short_header(stream, map, mapsize, buffer, bufsiz);
997 if (status < Z_OK)
998 return -1;
d131b7af 999
46f03448
KN
1000 /*
1001 * Check if entire header is unpacked in the first iteration.
d131b7af 1002 */
46f03448
KN
1003 if (memchr(buffer, '\0', stream->next_out - (unsigned char *)buffer))
1004 return 0;
d131b7af 1005
46f03448
KN
1006 /*
1007 * buffer[0..bufsiz] was not large enough. Copy the partial
1008 * result out to header, and then append the result of further
1009 * reading the stream.
1010 */
1011 strbuf_add(header, buffer, stream->next_out - (unsigned char *)buffer);
1012 stream->next_out = buffer;
1013 stream->avail_out = bufsiz;
d131b7af 1014
46f03448
KN
1015 do {
1016 status = git_inflate(stream, 0);
1017 strbuf_add(header, buffer, stream->next_out - (unsigned char *)buffer);
1018 if (memchr(buffer, '\0', stream->next_out - (unsigned char *)buffer))
1019 return 0;
1020 stream->next_out = buffer;
1021 stream->avail_out = bufsiz;
1022 } while (status != Z_STREAM_END);
1023 return -1;
d131b7af
SP
1024}
1025
ef49a7a0 1026static void *unpack_sha1_rest(git_zstream *stream, void *buffer, unsigned long size, const unsigned char *sha1)
95099731 1027{
5180cacc 1028 int bytes = strlen(buffer) + 1;
3aee68aa 1029 unsigned char *buf = xmallocz(size);
93821bd9 1030 unsigned long n;
7efbff75 1031 int status = Z_OK;
95099731 1032
93821bd9
LT
1033 n = stream->total_out - bytes;
1034 if (n > size)
1035 n = size;
1036 memcpy(buf, (char *) buffer + bytes, n);
1037 bytes = n;
456cdf6e
LT
1038 if (bytes <= size) {
1039 /*
1040 * The above condition must be (bytes <= size), not
1041 * (bytes < size). In other words, even though we
ccf5ace0 1042 * expect no more output and set avail_out to zero,
456cdf6e
LT
1043 * the input zlib stream may have bytes that express
1044 * "this concludes the stream", and we *do* want to
1045 * eat that input.
1046 *
1047 * Otherwise we would not be able to test that we
1048 * consumed all the input to reach the expected size;
1049 * we also want to check that zlib tells us that all
1050 * went well with status == Z_STREAM_END at the end.
1051 */
5180cacc
LT
1052 stream->next_out = buf + bytes;
1053 stream->avail_out = size - bytes;
7efbff75 1054 while (status == Z_OK)
39c68542 1055 status = git_inflate(stream, Z_FINISH);
5180cacc 1056 }
456cdf6e 1057 if (status == Z_STREAM_END && !stream->avail_in) {
39c68542 1058 git_inflate_end(stream);
7efbff75 1059 return buf;
95099731
NTND
1060 }
1061
7efbff75
JH
1062 if (status < 0)
1063 error("corrupt loose object '%s'", sha1_to_hex(sha1));
1064 else if (stream->avail_in)
1065 error("garbage at end of loose object '%s'",
1066 sha1_to_hex(sha1));
1067 free(buf);
1068 return NULL;
95099731
NTND
1069}
1070
d40d535b 1071/*
5180cacc
LT
1072 * We used to just use "sscanf()", but that's actually way
1073 * too permissive for what we want to check. So do an anal
1074 * object header parse by hand.
d40d535b 1075 */
46f03448
KN
1076static int parse_sha1_header_extended(const char *hdr, struct object_info *oi,
1077 unsigned int flags)
1f688557 1078{
46f03448 1079 const char *type_buf = hdr;
5180cacc 1080 unsigned long size;
46f03448 1081 int type, type_len = 0;
43057304 1082
5180cacc 1083 /*
46f03448 1084 * The type can be of any size but is followed by
21666f1a 1085 * a space.
5180cacc 1086 */
5180cacc
LT
1087 for (;;) {
1088 char c = *hdr++;
d21f8426
JH
1089 if (!c)
1090 return -1;
5180cacc
LT
1091 if (c == ' ')
1092 break;
46f03448 1093 type_len++;
5180cacc 1094 }
1f688557 1095
46f03448 1096 type = type_from_string_gently(type_buf, type_len, 1);
6ca32f47
BW
1097 if (oi->type_name)
1098 strbuf_add(oi->type_name, type_buf, type_len);
46f03448
KN
1099 /*
1100 * Set type to 0 if its an unknown object and
2e3a16b2 1101 * we're obtaining the type using '--allow-unknown-type'
46f03448
KN
1102 * option.
1103 */
19fc5e84 1104 if ((flags & OBJECT_INFO_ALLOW_UNKNOWN_TYPE) && (type < 0))
46f03448
KN
1105 type = 0;
1106 else if (type < 0)
1107 die("invalid object type");
1108 if (oi->typep)
1109 *oi->typep = type;
5180cacc
LT
1110
1111 /*
1112 * The length must follow immediately, and be in canonical
1113 * decimal format (ie "010" is not valid).
1114 */
1115 size = *hdr++ - '0';
1116 if (size > 9)
1117 return -1;
1118 if (size) {
1119 for (;;) {
1120 unsigned long c = *hdr - '0';
1121 if (c > 9)
1122 break;
1123 hdr++;
1124 size = size * 10 + c;
1b1005d1 1125 }
c01f51cc 1126 }
46f03448
KN
1127
1128 if (oi->sizep)
1129 *oi->sizep = size;
5180cacc
LT
1130
1131 /*
1132 * The length must be followed by a zero byte
1133 */
46f03448 1134 return *hdr ? -1 : type;
1f688557
JH
1135}
1136
46f03448 1137int parse_sha1_header(const char *hdr, unsigned long *sizep)
bf592c50 1138{
27b5c1a0 1139 struct object_info oi = OBJECT_INFO_INIT;
21666f1a 1140
46f03448 1141 oi.sizep = sizep;
1f0c0d36 1142 return parse_sha1_header_extended(hdr, &oi, 0);
bf592c50
DB
1143}
1144
052fe5ea 1145static int sha1_loose_object_info(const unsigned char *sha1,
46f03448
KN
1146 struct object_info *oi,
1147 int flags)
65c2e0c3 1148{
46f03448
KN
1149 int status = 0;
1150 unsigned long mapsize;
65c2e0c3 1151 void *map;
ef49a7a0 1152 git_zstream stream;
d65a16f6 1153 char hdr[32];
46f03448 1154 struct strbuf hdrbuf = STRBUF_INIT;
c84a1f3e 1155 unsigned long size_scratch;
65c2e0c3 1156
5d642e75
JK
1157 if (oi->delta_base_sha1)
1158 hashclr(oi->delta_base_sha1);
1159
052fe5ea
JK
1160 /*
1161 * If we don't care about type or size, then we don't
4ef8d1dd
JH
1162 * need to look inside the object at all. Note that we
1163 * do not optimize out the stat call, even if the
1164 * caller doesn't care about the disk-size, since our
1165 * return value implicitly indicates whether the
1166 * object even exists.
052fe5ea 1167 */
6ca32f47 1168 if (!oi->typep && !oi->type_name && !oi->sizep && !oi->contentp) {
771e7d57 1169 const char *path;
4ef8d1dd 1170 struct stat st;
771e7d57 1171 if (stat_sha1_file(sha1, &st, &path) < 0)
4ef8d1dd
JH
1172 return -1;
1173 if (oi->disk_sizep)
23c339c0 1174 *oi->disk_sizep = st.st_size;
052fe5ea
JK
1175 return 0;
1176 }
1177
bb6b8e4f 1178 map = map_sha1_file(sha1, &mapsize);
f0df4ed5 1179 if (!map)
dbea72a8 1180 return -1;
c84a1f3e
JT
1181
1182 if (!oi->sizep)
1183 oi->sizep = &size_scratch;
1184
23c339c0
JK
1185 if (oi->disk_sizep)
1186 *oi->disk_sizep = mapsize;
19fc5e84 1187 if ((flags & OBJECT_INFO_ALLOW_UNKNOWN_TYPE)) {
46f03448
KN
1188 if (unpack_sha1_header_to_strbuf(&stream, map, mapsize, hdr, sizeof(hdr), &hdrbuf) < 0)
1189 status = error("unable to unpack %s header with --allow-unknown-type",
1190 sha1_to_hex(sha1));
1191 } else if (unpack_sha1_header(&stream, map, mapsize, hdr, sizeof(hdr)) < 0)
36e4d74a
JH
1192 status = error("unable to unpack %s header",
1193 sha1_to_hex(sha1));
46f03448
KN
1194 if (status < 0)
1195 ; /* Do nothing */
1196 else if (hdrbuf.len) {
1197 if ((status = parse_sha1_header_extended(hdrbuf.buf, oi, flags)) < 0)
1198 status = error("unable to parse %s header with --allow-unknown-type",
1199 sha1_to_hex(sha1));
1200 } else if ((status = parse_sha1_header_extended(hdr, oi, flags)) < 0)
36e4d74a 1201 status = error("unable to parse %s header", sha1_to_hex(sha1));
c84a1f3e 1202
b3ea7dd3 1203 if (status >= 0 && oi->contentp) {
c84a1f3e
JT
1204 *oi->contentp = unpack_sha1_rest(&stream, hdr,
1205 *oi->sizep, sha1);
b3ea7dd3
JK
1206 if (!*oi->contentp) {
1207 git_inflate_end(&stream);
1208 status = -1;
1209 }
1210 } else
c84a1f3e
JT
1211 git_inflate_end(&stream);
1212
65c2e0c3 1213 munmap(map, mapsize);
46f03448 1214 if (status && oi->typep)
23c339c0 1215 *oi->typep = status;
c84a1f3e
JT
1216 if (oi->sizep == &size_scratch)
1217 oi->sizep = NULL;
46f03448 1218 strbuf_release(&hdrbuf);
3ab0fb06 1219 oi->whence = OI_LOOSE;
93cff9a9 1220 return (status < 0) ? status : 0;
65c2e0c3
JH
1221}
1222
8b4c0103
JT
1223int fetch_if_missing = 1;
1224
abef9020 1225int oid_object_info_extended(const struct object_id *oid, struct object_info *oi, unsigned flags)
f0df4ed5 1226{
cd585e2a 1227 static struct object_info blank_oi = OBJECT_INFO_INIT;
f0df4ed5 1228 struct pack_entry e;
5b086407 1229 int rtype;
1f0c0d36 1230 const unsigned char *real = (flags & OBJECT_INFO_LOOKUP_REPLACE) ?
abef9020 1231 lookup_replace_object(oid->hash) :
1232 oid->hash;
8b4c0103 1233 int already_retried = 0;
7984f238 1234 struct object_id realoid;
1235
1236 hashcpy(realoid.hash, real);
f0df4ed5 1237
87b5e236
JK
1238 if (is_null_sha1(real))
1239 return -1;
1240
cd585e2a
JT
1241 if (!oi)
1242 oi = &blank_oi;
1243
dfdd4afc
JT
1244 if (!(flags & OBJECT_INFO_SKIP_CACHED)) {
1245 struct cached_object *co = find_cached_object(real);
1246 if (co) {
1247 if (oi->typep)
1248 *(oi->typep) = co->type;
1249 if (oi->sizep)
1250 *(oi->sizep) = co->size;
1251 if (oi->disk_sizep)
1252 *(oi->disk_sizep) = 0;
1253 if (oi->delta_base_sha1)
1254 hashclr(oi->delta_base_sha1);
6ca32f47 1255 if (oi->type_name)
debca9d2 1256 strbuf_addstr(oi->type_name, type_name(co->type));
dfdd4afc
JT
1257 if (oi->contentp)
1258 *oi->contentp = xmemdupz(co->buf, co->size);
1259 oi->whence = OI_CACHED;
1260 return 0;
1261 }
c4d9986f
NTND
1262 }
1263
8b4c0103
JT
1264 while (1) {
1265 if (find_pack_entry(real, &e))
1266 break;
1267
ddd63e64 1268 /* Most likely it's a loose object. */
3ab0fb06 1269 if (!sha1_loose_object_info(real, oi, flags))
5b086407 1270 return 0;
ddd63e64
SG
1271
1272 /* Not a loose object; someone else may have just packed it. */
8b4c0103
JT
1273 reprepare_packed_git();
1274 if (find_pack_entry(real, &e))
1275 break;
1276
1277 /* Check if it is a missing object */
1278 if (fetch_if_missing && repository_format_partial_clone &&
1279 !already_retried) {
1280 /*
1281 * TODO Investigate haveing fetch_object() return
1282 * TODO error/success and stopping the music here.
1283 */
1284 fetch_object(repository_format_partial_clone, real);
1285 already_retried = 1;
1286 continue;
dfdd4afc 1287 }
8b4c0103
JT
1288
1289 return -1;
f0df4ed5 1290 }
3d77d877 1291
cd585e2a
JT
1292 if (oi == &blank_oi)
1293 /*
1294 * We know that the caller doesn't actually need the
1295 * information below, so return early.
1296 */
1297 return 0;
23c339c0 1298 rtype = packed_object_info(e.p, e.offset, oi);
412916ee 1299 if (rtype < 0) {
1f7117ef 1300 mark_bad_packed_object(e.p, real);
abef9020 1301 return oid_object_info_extended(&realoid, oi, 0);
3ab0fb06 1302 } else if (oi->whence == OI_PACKED) {
9a490590
JH
1303 oi->u.packed.offset = e.offset;
1304 oi->u.packed.pack = e.p;
1305 oi->u.packed.is_delta = (rtype == OBJ_REF_DELTA ||
1306 rtype == OBJ_OFS_DELTA);
3d77d877
NP
1307 }
1308
5b086407 1309 return 0;
f0df4ed5
JS
1310}
1311
3fc0dca9 1312/* returns enum object_type or negative */
abef9020 1313int oid_object_info(const struct object_id *oid, unsigned long *sizep)
9a490590 1314{
5b086407 1315 enum object_type type;
27b5c1a0 1316 struct object_info oi = OBJECT_INFO_INIT;
9a490590 1317
5b086407 1318 oi.typep = &type;
9a490590 1319 oi.sizep = sizep;
abef9020 1320 if (oid_object_info_extended(oid, &oi,
1321 OBJECT_INFO_LOOKUP_REPLACE) < 0)
5b086407
JK
1322 return -1;
1323 return type;
9a490590
JH
1324}
1325
f1d8130b
JT
1326static void *read_object(const unsigned char *sha1, enum object_type *type,
1327 unsigned long *size)
1328{
7984f238 1329 struct object_id oid;
f1d8130b
JT
1330 struct object_info oi = OBJECT_INFO_INIT;
1331 void *content;
1332 oi.typep = type;
1333 oi.sizep = size;
1334 oi.contentp = &content;
1335
7984f238 1336 hashcpy(oid.hash, sha1);
1337
abef9020 1338 if (oid_object_info_extended(&oid, &oi, 0) < 0)
f1d8130b
JT
1339 return NULL;
1340 return content;
1341}
1342
829e5c3b
PO
1343int pretend_object_file(void *buf, unsigned long len, enum object_type type,
1344 struct object_id *oid)
d66b37bb
JH
1345{
1346 struct cached_object *co;
1347
169c9c01 1348 hash_object_file(buf, len, type_name(type), oid);
829e5c3b 1349 if (has_sha1_file(oid->hash) || find_cached_object(oid->hash))
d66b37bb 1350 return 0;
c7353967 1351 ALLOC_GROW(cached_objects, cached_object_nr + 1, cached_object_alloc);
d66b37bb
JH
1352 co = &cached_objects[cached_object_nr++];
1353 co->size = len;
21666f1a 1354 co->type = type;
efa13f7b
JH
1355 co->buf = xmalloc(len);
1356 memcpy(co->buf, buf, len);
829e5c3b 1357 hashcpy(co->sha1, oid->hash);
d66b37bb
JH
1358 return 0;
1359}
1360
b6c4cecc
JH
1361/*
1362 * This function dies on corrupt objects; the callers who want to
1363 * deal with them should arrange to call read_object() and give error
1364 * messages themselves.
1365 */
5bf29b95
JH
1366void *read_sha1_file_extended(const unsigned char *sha1,
1367 enum object_type *type,
1368 unsigned long *size,
1f0c0d36 1369 int lookup_replace)
ac939109 1370{
3ba7a065 1371 void *data;
b6c4cecc 1372 const struct packed_git *p;
771e7d57
JK
1373 const char *path;
1374 struct stat st;
1f0c0d36
JT
1375 const unsigned char *repl = lookup_replace ? lookup_replace_object(sha1)
1376 : sha1;
b6c4cecc 1377
3ba7a065
JH
1378 errno = 0;
1379 data = read_object(repl, type, size);
4bbf5a26 1380 if (data)
b6c4cecc 1381 return data;
68095570 1382
25f3af3f 1383 if (errno && errno != ENOENT)
3ba7a065
JH
1384 die_errno("failed to read object %s", sha1_to_hex(sha1));
1385
68095570 1386 /* die if we replaced an object with one that does not exist */
b6c4cecc 1387 if (repl != sha1)
68095570
CC
1388 die("replacement %s not found for %s",
1389 sha1_to_hex(repl), sha1_to_hex(sha1));
1390
771e7d57 1391 if (!stat_sha1_file(repl, &st, &path))
b6c4cecc
JH
1392 die("loose object %s (stored in %s) is corrupt",
1393 sha1_to_hex(repl), path);
68095570 1394
b6c4cecc
JH
1395 if ((p = has_packed_and_bad(repl)) != NULL)
1396 die("packed object %s (stored in %s) is corrupt",
1397 sha1_to_hex(repl), p->pack_name);
f5552aee 1398
b6c4cecc 1399 return NULL;
ac939109
NP
1400}
1401
40469ee9 1402void *read_object_with_reference(const unsigned char *sha1,
21666f1a 1403 const char *required_type_name,
40469ee9
JH
1404 unsigned long *size,
1405 unsigned char *actual_sha1_return)
f4913f91 1406{
21666f1a 1407 enum object_type type, required_type;
f4913f91
JH
1408 void *buffer;
1409 unsigned long isize;
40469ee9 1410 unsigned char actual_sha1[20];
f4913f91 1411
21666f1a 1412 required_type = type_from_string(required_type_name);
e702496e 1413 hashcpy(actual_sha1, sha1);
40469ee9
JH
1414 while (1) {
1415 int ref_length = -1;
1416 const char *ref_type = NULL;
f4913f91 1417
21666f1a 1418 buffer = read_sha1_file(actual_sha1, &type, &isize);
40469ee9
JH
1419 if (!buffer)
1420 return NULL;
21666f1a 1421 if (type == required_type) {
40469ee9
JH
1422 *size = isize;
1423 if (actual_sha1_return)
e702496e 1424 hashcpy(actual_sha1_return, actual_sha1);
40469ee9
JH
1425 return buffer;
1426 }
1427 /* Handle references */
21666f1a 1428 else if (type == OBJ_COMMIT)
40469ee9 1429 ref_type = "tree ";
21666f1a 1430 else if (type == OBJ_TAG)
40469ee9
JH
1431 ref_type = "object ";
1432 else {
1433 free(buffer);
1434 return NULL;
1435 }
1436 ref_length = strlen(ref_type);
f4913f91 1437
50974ec9
MK
1438 if (ref_length + 40 > isize ||
1439 memcmp(buffer, ref_type, ref_length) ||
1d7f171c 1440 get_sha1_hex((char *) buffer + ref_length, actual_sha1)) {
40469ee9
JH
1441 free(buffer);
1442 return NULL;
1443 }
1cf58e72 1444 free(buffer);
40469ee9
JH
1445 /* Now we have the ID of the referred-to object in
1446 * actual_sha1. Check again. */
f4913f91 1447 }
f4913f91
JH
1448}
1449
a09c985e
PO
1450static void write_object_file_prepare(const void *buf, unsigned long len,
1451 const char *type, struct object_id *oid,
1452 char *hdr, int *hdrlen)
d410c0f5 1453{
18e2588e 1454 git_hash_ctx c;
d410c0f5
JH
1455
1456 /* Generate the header */
ef1286d3 1457 *hdrlen = xsnprintf(hdr, *hdrlen, "%s %lu", type, len)+1;
d410c0f5
JH
1458
1459 /* Sha1.. */
18e2588e 1460 the_hash_algo->init_fn(&c);
1461 the_hash_algo->update_fn(&c, hdr, *hdrlen);
1462 the_hash_algo->update_fn(&c, buf, len);
0fd90dab 1463 the_hash_algo->final_fn(oid->hash, &c);
d410c0f5
JH
1464}
1465
230f1322 1466/*
5a688fe4 1467 * Move the just written object into its final resting place.
230f1322 1468 */
cb5add58 1469int finalize_object_file(const char *tmpfile, const char *filename)
230f1322 1470{
e32c0a9c 1471 int ret = 0;
5a688fe4 1472
348df166 1473 if (object_creation_mode == OBJECT_CREATION_USES_RENAMES)
be66a6c4
JS
1474 goto try_rename;
1475 else if (link(tmpfile, filename))
e32c0a9c 1476 ret = errno;
7ebb6fca
LT
1477
1478 /*
1479 * Coda hack - coda doesn't like cross-directory links,
1480 * so we fall back to a rename, which will mean that it
1481 * won't be able to check collisions, but that's not a
1482 * big deal.
1483 *
1484 * The same holds for FAT formatted media.
1485 *
3be1f18e 1486 * When this succeeds, we just return. We have nothing
7ebb6fca
LT
1487 * left to unlink.
1488 */
1489 if (ret && ret != EEXIST) {
be66a6c4 1490 try_rename:
7ebb6fca 1491 if (!rename(tmpfile, filename))
3be1f18e 1492 goto out;
9e48b389 1493 ret = errno;
230f1322 1494 }
691f1a28 1495 unlink_or_warn(tmpfile);
230f1322
LT
1496 if (ret) {
1497 if (ret != EEXIST) {
7616c6ca 1498 return error_errno("unable to write sha1 filename %s", filename);
230f1322
LT
1499 }
1500 /* FIXME!!! Collision check here ? */
1501 }
1502
3be1f18e 1503out:
5256b006 1504 if (adjust_shared_perm(filename))
5a688fe4 1505 return error("unable to set permission to '%s'", filename);
230f1322
LT
1506 return 0;
1507}
1508
4d548150
LT
1509static int write_buffer(int fd, const void *buf, size_t len)
1510{
d34cf19b 1511 if (write_in_full(fd, buf, len) < 0)
7616c6ca 1512 return error_errno("file write error");
4d548150
LT
1513 return 0;
1514}
1515
f070facc
PO
1516int hash_object_file(const void *buf, unsigned long len, const char *type,
1517 struct object_id *oid)
abdc3fc8 1518{
d65a16f6 1519 char hdr[32];
ef1286d3 1520 int hdrlen = sizeof(hdr);
a09c985e 1521 write_object_file_prepare(buf, len, type, oid, hdr, &hdrlen);
abdc3fc8
RS
1522 return 0;
1523}
1524
e9039dd3
LT
1525/* Finalize a file on disk, and close it. */
1526static void close_sha1_file(int fd)
1527{
aafe9fba
LT
1528 if (fsync_object_files)
1529 fsync_or_die(fd, "sha1 file");
e9039dd3 1530 if (close(fd) != 0)
d824cbba 1531 die_errno("error when closing sha1 file");
e9039dd3
LT
1532}
1533
5723fe7e
LT
1534/* Size of directory component, including the ending '/' */
1535static inline int directory_size(const char *filename)
1536{
1537 const char *s = strrchr(filename, '/');
1538 if (!s)
1539 return 0;
1540 return s - filename + 1;
1541}
1542
1543/*
1544 * This creates a temporary file in the same directory as the final
1545 * 'filename'
1546 *
1547 * We want to avoid cross-directory filename renames, because those
1548 * can have problems on various filesystems (FAT, NFS, Coda).
1549 */
d4b3d11a 1550static int create_tmpfile(struct strbuf *tmp, const char *filename)
5723fe7e
LT
1551{
1552 int fd, dirlen = directory_size(filename);
1553
d4b3d11a
JK
1554 strbuf_reset(tmp);
1555 strbuf_add(tmp, filename, dirlen);
1556 strbuf_addstr(tmp, "tmp_obj_XXXXXX");
1557 fd = git_mkstemp_mode(tmp->buf, 0444);
cbacbf4e 1558 if (fd < 0 && dirlen && errno == ENOENT) {
d4b3d11a
JK
1559 /*
1560 * Make sure the directory exists; note that the contents
1561 * of the buffer are undefined after mkstemp returns an
1562 * error, so we have to rewrite the whole buffer from
1563 * scratch.
1564 */
1565 strbuf_reset(tmp);
1566 strbuf_add(tmp, filename, dirlen - 1);
1567 if (mkdir(tmp->buf, 0777) && errno != EEXIST)
b2476a60 1568 return -1;
d4b3d11a 1569 if (adjust_shared_perm(tmp->buf))
5723fe7e
LT
1570 return -1;
1571
1572 /* Try again */
d4b3d11a
JK
1573 strbuf_addstr(tmp, "/tmp_obj_XXXXXX");
1574 fd = git_mkstemp_mode(tmp->buf, 0444);
5723fe7e
LT
1575 }
1576 return fd;
1577}
1578
3fc7281f
PO
1579static int write_loose_object(const struct object_id *oid, char *hdr,
1580 int hdrlen, const void *buf, unsigned long len,
1581 time_t mtime)
0fcfd160 1582{
915308b1 1583 int fd, ret;
9892beba 1584 unsigned char compressed[4096];
ef49a7a0 1585 git_zstream stream;
18e2588e 1586 git_hash_ctx c;
3fc7281f 1587 struct object_id parano_oid;
d4b3d11a 1588 static struct strbuf tmp_file = STRBUF_INIT;
ea657730
CC
1589 static struct strbuf filename = STRBUF_INIT;
1590
1591 strbuf_reset(&filename);
8be8342b 1592 sha1_file_name(&filename, oid->hash);
a44c9a5e 1593
ea657730 1594 fd = create_tmpfile(&tmp_file, filename.buf);
aac17941 1595 if (fd < 0) {
35243577 1596 if (errno == EACCES)
82247e9b 1597 return error("insufficient permission for adding an object to repository database %s", get_object_directory());
916d081b 1598 else
7616c6ca 1599 return error_errno("unable to create temporary file");
aac17941
LT
1600 }
1601
0fcfd160 1602 /* Set it up */
55bb5c91 1603 git_deflate_init(&stream, zlib_compression_level);
0fcfd160 1604 stream.next_out = compressed;
9892beba 1605 stream.avail_out = sizeof(compressed);
18e2588e 1606 the_hash_algo->init_fn(&c);
a44c9a5e
LT
1607
1608 /* First header.. */
d65a16f6 1609 stream.next_in = (unsigned char *)hdr;
a44c9a5e 1610 stream.avail_in = hdrlen;
55bb5c91
JH
1611 while (git_deflate(&stream, 0) == Z_OK)
1612 ; /* nothing */
18e2588e 1613 the_hash_algo->update_fn(&c, hdr, hdrlen);
a44c9a5e
LT
1614
1615 /* Then the data itself.. */
c00e657d 1616 stream.next_in = (void *)buf;
a44c9a5e 1617 stream.avail_in = len;
9892beba 1618 do {
748af44c 1619 unsigned char *in0 = stream.next_in;
55bb5c91 1620 ret = git_deflate(&stream, Z_FINISH);
18e2588e 1621 the_hash_algo->update_fn(&c, in0, stream.next_in - in0);
9892beba
NP
1622 if (write_buffer(fd, compressed, stream.next_out - compressed) < 0)
1623 die("unable to write sha1 file");
1624 stream.next_out = compressed;
1625 stream.avail_out = sizeof(compressed);
1626 } while (ret == Z_OK);
1627
ac54c277 1628 if (ret != Z_STREAM_END)
3fc7281f
PO
1629 die("unable to deflate new object %s (%d)", oid_to_hex(oid),
1630 ret);
55bb5c91 1631 ret = git_deflate_end_gently(&stream);
ac54c277 1632 if (ret != Z_OK)
3fc7281f
PO
1633 die("deflateEnd on object %s failed (%d)", oid_to_hex(oid),
1634 ret);
18e2588e 1635 the_hash_algo->final_fn(parano_oid.hash, &c);
3fc7281f
PO
1636 if (oidcmp(oid, &parano_oid) != 0)
1637 die("confused by unstable object source data for %s",
1638 oid_to_hex(oid));
ac54c277 1639
e9039dd3 1640 close_sha1_file(fd);
0fcfd160 1641
bbac7311
NP
1642 if (mtime) {
1643 struct utimbuf utb;
1644 utb.actime = mtime;
1645 utb.modtime = mtime;
d4b3d11a 1646 if (utime(tmp_file.buf, &utb) < 0)
7616c6ca 1647 warning_errno("failed utime() on %s", tmp_file.buf);
bbac7311
NP
1648 }
1649
ea657730 1650 return finalize_object_file(tmp_file.buf, filename.buf);
0fcfd160 1651}
8237b185 1652
33d4221c
JK
1653static int freshen_loose_object(const unsigned char *sha1)
1654{
1655 return check_and_freshen(sha1, 1);
1656}
1657
1658static int freshen_packed_object(const unsigned char *sha1)
1659{
1660 struct pack_entry e;
ee1c6c34
JK
1661 if (!find_pack_entry(sha1, &e))
1662 return 0;
1663 if (e.p->freshened)
1664 return 1;
1665 if (!freshen_file(e.p->pack_name))
1666 return 0;
1667 e.p->freshened = 1;
1668 return 1;
33d4221c
JK
1669}
1670
a09c985e
PO
1671int write_object_file(const void *buf, unsigned long len, const char *type,
1672 struct object_id *oid)
bbac7311 1673{
bbac7311 1674 char hdr[32];
ef1286d3 1675 int hdrlen = sizeof(hdr);
bbac7311
NP
1676
1677 /* Normally if we have it in the pack then we do not bother writing
1678 * it out into .git/objects/??/?{38} file.
1679 */
a09c985e
PO
1680 write_object_file_prepare(buf, len, type, oid, hdr, &hdrlen);
1681 if (freshen_packed_object(oid->hash) || freshen_loose_object(oid->hash))
bbac7311 1682 return 0;
3fc7281f 1683 return write_loose_object(oid, hdr, hdrlen, buf, len, 0);
bbac7311
NP
1684}
1685
1752cbbc
PO
1686int hash_object_file_literally(const void *buf, unsigned long len,
1687 const char *type, struct object_id *oid,
1688 unsigned flags)
0c3db67c
ES
1689{
1690 char *header;
1691 int hdrlen, status = 0;
1692
1693 /* type string, SP, %lu of the length plus NUL must fit this */
ef1286d3
JK
1694 hdrlen = strlen(type) + 32;
1695 header = xmalloc(hdrlen);
a09c985e 1696 write_object_file_prepare(buf, len, type, oid, header, &hdrlen);
0c3db67c
ES
1697
1698 if (!(flags & HASH_WRITE_OBJECT))
1699 goto cleanup;
da77611d 1700 if (freshen_packed_object(oid->hash) || freshen_loose_object(oid->hash))
0c3db67c 1701 goto cleanup;
3fc7281f 1702 status = write_loose_object(oid, header, hdrlen, buf, len, 0);
0c3db67c
ES
1703
1704cleanup:
1705 free(header);
1706 return status;
1707}
1708
4bdb70a4 1709int force_object_loose(const struct object_id *oid, time_t mtime)
bbac7311 1710{
bbac7311
NP
1711 void *buf;
1712 unsigned long len;
1713 enum object_type type;
1714 char hdr[32];
1715 int hdrlen;
1fb23e65 1716 int ret;
bbac7311 1717
4bdb70a4 1718 if (has_loose_object(oid->hash))
bbac7311 1719 return 0;
4bdb70a4 1720 buf = read_object(oid->hash, &type, &len);
bbac7311 1721 if (!buf)
4bdb70a4 1722 return error("cannot read sha1_file for %s", oid_to_hex(oid));
debca9d2 1723 hdrlen = xsnprintf(hdr, sizeof(hdr), "%s %lu", type_name(type), len) + 1;
3fc7281f 1724 ret = write_loose_object(oid, hdr, hdrlen, buf, len, mtime);
1fb23e65
BS
1725 free(buf);
1726
1727 return ret;
bbac7311
NP
1728}
1729
0eeb077b 1730int has_sha1_file_with_flags(const unsigned char *sha1, int flags)
8237b185 1731{
7984f238 1732 struct object_id oid;
3e8b7d3c
JN
1733 if (!startup_info->have_repository)
1734 return 0;
7984f238 1735 hashcpy(oid.hash, sha1);
abef9020 1736 return oid_object_info_extended(&oid, NULL,
1737 flags | OBJECT_INFO_SKIP_CACHED) >= 0;
b419aa25 1738}
1739
1740int has_object_file(const struct object_id *oid)
1741{
1742 return has_sha1_file(oid->hash);
8237b185 1743}
74400e71 1744
5827a035
JK
1745int has_object_file_with_flags(const struct object_id *oid, int flags)
1746{
1747 return has_sha1_file_with_flags(oid->hash, flags);
1748}
1749
c879daa2
NTND
1750static void check_tree(const void *buf, size_t size)
1751{
1752 struct tree_desc desc;
1753 struct name_entry entry;
1754
1755 init_tree_desc(&desc, buf, size);
1756 while (tree_entry(&desc, &entry))
1757 /* do nothing
1758 * tree_entry() will die() on malformed entries */
1759 ;
1760}
1761
1762static void check_commit(const void *buf, size_t size)
1763{
1764 struct commit c;
1765 memset(&c, 0, sizeof(c));
1766 if (parse_commit_buffer(&c, buf, size))
1767 die("corrupt commit");
1768}
1769
1770static void check_tag(const void *buf, size_t size)
1771{
1772 struct tag t;
1773 memset(&t, 0, sizeof(t));
1774 if (parse_tag_buffer(&t, buf, size))
1775 die("corrupt tag");
1776}
1777
bcd29864 1778static int index_mem(struct object_id *oid, void *buf, size_t size,
c4ce46fc
JH
1779 enum object_type type,
1780 const char *path, unsigned flags)
e7332f96 1781{
6c510bee 1782 int ret, re_allocated = 0;
c4ce46fc 1783 int write_object = flags & HASH_WRITE_OBJECT;
74400e71 1784
7672db20 1785 if (!type)
edaec3fb 1786 type = OBJ_BLOB;
6c510bee
LT
1787
1788 /*
1789 * Convert blobs to git internal format
1790 */
43df4f86 1791 if ((type == OBJ_BLOB) && path) {
f285a2d7 1792 struct strbuf nbuf = STRBUF_INIT;
82b474e0 1793 if (convert_to_git(&the_index, path, buf, size, &nbuf,
8462ff43 1794 get_conv_flags(flags))) {
b315c5c0 1795 buf = strbuf_detach(&nbuf, &size);
6c510bee
LT
1796 re_allocated = 1;
1797 }
1798 }
c4ce46fc 1799 if (flags & HASH_FORMAT_CHECK) {
c879daa2
NTND
1800 if (type == OBJ_TREE)
1801 check_tree(buf, size);
1802 if (type == OBJ_COMMIT)
1803 check_commit(buf, size);
1804 if (type == OBJ_TAG)
1805 check_tag(buf, size);
1806 }
6c510bee 1807
7672db20 1808 if (write_object)
169c9c01 1809 ret = write_object_file(buf, size, type_name(type), oid);
abdc3fc8 1810 else
169c9c01 1811 ret = hash_object_file(buf, size, type_name(type), oid);
43df4f86 1812 if (re_allocated)
6c510bee 1813 free(buf);
43df4f86
DP
1814 return ret;
1815}
1816
bcd29864 1817static int index_stream_convert_blob(struct object_id *oid, int fd,
9035d75a
SP
1818 const char *path, unsigned flags)
1819{
1820 int ret;
1821 const int write_object = flags & HASH_WRITE_OBJECT;
1822 struct strbuf sbuf = STRBUF_INIT;
1823
1824 assert(path);
1825 assert(would_convert_to_git_filter_fd(path));
1826
d6c41c20 1827 convert_to_git_filter_fd(&the_index, path, fd, &sbuf,
8462ff43 1828 get_conv_flags(flags));
9035d75a
SP
1829
1830 if (write_object)
169c9c01 1831 ret = write_object_file(sbuf.buf, sbuf.len, type_name(OBJ_BLOB),
a09c985e 1832 oid);
9035d75a 1833 else
169c9c01 1834 ret = hash_object_file(sbuf.buf, sbuf.len, type_name(OBJ_BLOB),
f070facc 1835 oid);
9035d75a
SP
1836 strbuf_release(&sbuf);
1837 return ret;
1838}
1839
bcd29864 1840static int index_pipe(struct object_id *oid, int fd, enum object_type type,
7b41e1e1
JH
1841 const char *path, unsigned flags)
1842{
1843 struct strbuf sbuf = STRBUF_INIT;
1844 int ret;
1845
1846 if (strbuf_read(&sbuf, fd, 4096) >= 0)
bcd29864 1847 ret = index_mem(oid, sbuf.buf, sbuf.len, type, path, flags);
7b41e1e1
JH
1848 else
1849 ret = -1;
1850 strbuf_release(&sbuf);
1851 return ret;
1852}
1853
ea68b0ce
DP
1854#define SMALL_FILE_SIZE (32*1024)
1855
bcd29864 1856static int index_core(struct object_id *oid, int fd, size_t size,
7b41e1e1
JH
1857 enum object_type type, const char *path,
1858 unsigned flags)
43df4f86
DP
1859{
1860 int ret;
43df4f86 1861
7b41e1e1 1862 if (!size) {
bcd29864 1863 ret = index_mem(oid, "", size, type, path, flags);
ea68b0ce
DP
1864 } else if (size <= SMALL_FILE_SIZE) {
1865 char *buf = xmalloc(size);
90dca671
JK
1866 ssize_t read_result = read_in_full(fd, buf, size);
1867 if (read_result < 0)
1868 ret = error_errno("read error while indexing %s",
1869 path ? path : "<unknown>");
1870 else if (read_result != size)
1871 ret = error("short read while indexing %s",
1872 path ? path : "<unknown>");
ea68b0ce 1873 else
bcd29864 1874 ret = index_mem(oid, buf, size, type, path, flags);
ea68b0ce 1875 free(buf);
08bda208 1876 } else {
43df4f86 1877 void *buf = xmmap(NULL, size, PROT_READ, MAP_PRIVATE, fd, 0);
bcd29864 1878 ret = index_mem(oid, buf, size, type, path, flags);
aac17941 1879 munmap(buf, size);
08bda208 1880 }
7b41e1e1
JH
1881 return ret;
1882}
1883
4dd1fbc7 1884/*
568508e7
JH
1885 * This creates one packfile per large blob unless bulk-checkin
1886 * machinery is "plugged".
4dd1fbc7
JH
1887 *
1888 * This also bypasses the usual "convert-to-git" dance, and that is on
1889 * purpose. We could write a streaming version of the converting
1890 * functions and insert that before feeding the data to fast-import
4f22b101
JK
1891 * (or equivalent in-core API described above). However, that is
1892 * somewhat complicated, as we do not know the size of the filter
1893 * result, which we need to know beforehand when writing a git object.
1894 * Since the primary motivation for trying to stream from the working
1895 * tree file and to avoid mmaping it in core is to deal with large
1896 * binary blobs, they generally do not want to get any conversion, and
1897 * callers should avoid this code path when filters are requested.
4dd1fbc7 1898 */
7d5e1dc3 1899static int index_stream(struct object_id *oid, int fd, size_t size,
4dd1fbc7
JH
1900 enum object_type type, const char *path,
1901 unsigned flags)
1902{
68ee6dfc 1903 return index_bulk_checkin(oid, fd, size, type, path, flags);
4dd1fbc7
JH
1904}
1905
e3506559 1906int index_fd(struct object_id *oid, int fd, struct stat *st,
7b41e1e1
JH
1907 enum object_type type, const char *path, unsigned flags)
1908{
1909 int ret;
7b41e1e1 1910
9079ab7c
SP
1911 /*
1912 * Call xsize_t() only when needed to avoid potentially unnecessary
1913 * die() for large files.
1914 */
9035d75a 1915 if (type == OBJ_BLOB && path && would_convert_to_git_filter_fd(path))
bcd29864 1916 ret = index_stream_convert_blob(oid, fd, path, flags);
9035d75a 1917 else if (!S_ISREG(st->st_mode))
bcd29864 1918 ret = index_pipe(oid, fd, type, path, flags);
9079ab7c 1919 else if (st->st_size <= big_file_threshold || type != OBJ_BLOB ||
82b474e0 1920 (path && would_convert_to_git(&the_index, path)))
bcd29864 1921 ret = index_core(oid, fd, xsize_t(st->st_size), type, path,
9079ab7c 1922 flags);
4dd1fbc7 1923 else
7d5e1dc3 1924 ret = index_stream(oid, fd, xsize_t(st->st_size), type, path,
9079ab7c 1925 flags);
43df4f86 1926 close(fd);
aac17941 1927 return ret;
74400e71 1928}
ec1fcc16 1929
98e019b0 1930int index_path(struct object_id *oid, const char *path, struct stat *st, unsigned flags)
ec1fcc16
JH
1931{
1932 int fd;
b760d3aa 1933 struct strbuf sb = STRBUF_INIT;
ea8e0297 1934 int rc = 0;
ec1fcc16
JH
1935
1936 switch (st->st_mode & S_IFMT) {
1937 case S_IFREG:
1938 fd = open(path, O_RDONLY);
1939 if (fd < 0)
7616c6ca 1940 return error_errno("open(\"%s\")", path);
e3506559 1941 if (index_fd(oid, fd, st, OBJ_BLOB, path, flags) < 0)
ec1fcc16
JH
1942 return error("%s: failed to insert into database",
1943 path);
1944 break;
1945 case S_IFLNK:
7616c6ca
NTND
1946 if (strbuf_readlink(&sb, path, st->st_size))
1947 return error_errno("readlink(\"%s\")", path);
c4ce46fc 1948 if (!(flags & HASH_WRITE_OBJECT))
f070facc 1949 hash_object_file(sb.buf, sb.len, blob_type, oid);
a09c985e 1950 else if (write_object_file(sb.buf, sb.len, blob_type, oid))
ea8e0297 1951 rc = error("%s: failed to insert into database", path);
b760d3aa 1952 strbuf_release(&sb);
ec1fcc16 1953 break;
f35a6d3b 1954 case S_IFDIR:
a98e6101 1955 return resolve_gitlink_ref(path, "HEAD", oid);
ec1fcc16
JH
1956 default:
1957 return error("%s: unsupported file type", path);
1958 }
ea8e0297 1959 return rc;
ec1fcc16 1960}
a69e5429
JH
1961
1962int read_pack_header(int fd, struct pack_header *header)
1963{
f48ecd38 1964 if (read_in_full(fd, header, sizeof(*header)) != sizeof(*header))
c697ad14
HO
1965 /* "eof before pack header was fully read" */
1966 return PH_ERROR_EOF;
1967
a69e5429
JH
1968 if (header->hdr_signature != htonl(PACK_SIGNATURE))
1969 /* "protocol error (pack signature mismatch detected)" */
1970 return PH_ERROR_PACK_SIGNATURE;
1971 if (!pack_version_ok(header->hdr_version))
1972 /* "protocol error (pack version unsupported)" */
1973 return PH_ERROR_PROTOCOL;
1974 return 0;
1975}
40d52ff7 1976
e816caa0 1977void assert_oid_type(const struct object_id *oid, enum object_type expect)
40d52ff7 1978{
abef9020 1979 enum object_type type = oid_object_info(oid, NULL);
40d52ff7 1980 if (type < 0)
e816caa0 1981 die("%s is not a valid object", oid_to_hex(oid));
40d52ff7 1982 if (type != expect)
e816caa0 1983 die("%s is not a valid '%s' object", oid_to_hex(oid),
debca9d2 1984 type_name(expect));
40d52ff7 1985}
27e1e22d 1986
70c49050 1987int for_each_file_in_obj_subdir(unsigned int subdir_nr,
cc817ca3
RS
1988 struct strbuf *path,
1989 each_loose_object_fn obj_cb,
1990 each_loose_cruft_fn cruft_cb,
1991 each_loose_subdir_fn subdir_cb,
1992 void *data)
27e1e22d 1993{
0375f472
RS
1994 size_t origlen, baselen;
1995 DIR *dir;
27e1e22d
JK
1996 struct dirent *de;
1997 int r = 0;
62a24c89 1998 struct object_id oid;
27e1e22d 1999
70c49050
RS
2000 if (subdir_nr > 0xff)
2001 BUG("invalid loose object subdirectory: %x", subdir_nr);
2002
0375f472
RS
2003 origlen = path->len;
2004 strbuf_complete(path, '/');
2005 strbuf_addf(path, "%02x", subdir_nr);
0375f472
RS
2006
2007 dir = opendir(path->buf);
27e1e22d 2008 if (!dir) {
0375f472
RS
2009 if (errno != ENOENT)
2010 r = error_errno("unable to open %s", path->buf);
2011 strbuf_setlen(path, origlen);
2012 return r;
27e1e22d
JK
2013 }
2014
62a24c89 2015 oid.hash[0] = subdir_nr;
163ee5e6
DS
2016 strbuf_addch(path, '/');
2017 baselen = path->len;
62a24c89 2018
27e1e22d 2019 while ((de = readdir(dir))) {
163ee5e6 2020 size_t namelen;
27e1e22d
JK
2021 if (is_dot_or_dotdot(de->d_name))
2022 continue;
2023
163ee5e6 2024 namelen = strlen(de->d_name);
27e1e22d 2025 strbuf_setlen(path, baselen);
163ee5e6
DS
2026 strbuf_add(path, de->d_name, namelen);
2027 if (namelen == GIT_SHA1_HEXSZ - 2 &&
62a24c89
RS
2028 !hex_to_bytes(oid.hash + 1, de->d_name,
2029 GIT_SHA1_RAWSZ - 1)) {
2030 if (obj_cb) {
2031 r = obj_cb(&oid, path->buf, data);
2032 if (r)
2033 break;
27e1e22d 2034 }
62a24c89 2035 continue;
27e1e22d
JK
2036 }
2037
2038 if (cruft_cb) {
2039 r = cruft_cb(de->d_name, path->buf, data);
2040 if (r)
2041 break;
2042 }
2043 }
094c7e63 2044 closedir(dir);
27e1e22d 2045
163ee5e6 2046 strbuf_setlen(path, baselen - 1);
27e1e22d
JK
2047 if (!r && subdir_cb)
2048 r = subdir_cb(subdir_nr, path->buf, data);
2049
0375f472
RS
2050 strbuf_setlen(path, origlen);
2051
27e1e22d
JK
2052 return r;
2053}
2054
e6f875e0 2055int for_each_loose_file_in_objdir_buf(struct strbuf *path,
27e1e22d
JK
2056 each_loose_object_fn obj_cb,
2057 each_loose_cruft_fn cruft_cb,
2058 each_loose_subdir_fn subdir_cb,
2059 void *data)
2060{
27e1e22d
JK
2061 int r = 0;
2062 int i;
2063
27e1e22d 2064 for (i = 0; i < 256; i++) {
e6f875e0 2065 r = for_each_file_in_obj_subdir(i, path, obj_cb, cruft_cb,
27e1e22d 2066 subdir_cb, data);
27e1e22d
JK
2067 if (r)
2068 break;
2069 }
2070
e6f875e0
JK
2071 return r;
2072}
2073
2074int for_each_loose_file_in_objdir(const char *path,
2075 each_loose_object_fn obj_cb,
2076 each_loose_cruft_fn cruft_cb,
2077 each_loose_subdir_fn subdir_cb,
2078 void *data)
2079{
2080 struct strbuf buf = STRBUF_INIT;
2081 int r;
2082
2083 strbuf_addstr(&buf, path);
2084 r = for_each_loose_file_in_objdir_buf(&buf, obj_cb, cruft_cb,
2085 subdir_cb, data);
27e1e22d 2086 strbuf_release(&buf);
e6f875e0 2087
27e1e22d
JK
2088 return r;
2089}
660c889e
JK
2090
2091struct loose_alt_odb_data {
2092 each_loose_object_fn *cb;
2093 void *data;
2094};
2095
2096static int loose_from_alt_odb(struct alternate_object_database *alt,
2097 void *vdata)
2098{
2099 struct loose_alt_odb_data *data = vdata;
b0a42642
JM
2100 struct strbuf buf = STRBUF_INIT;
2101 int r;
2102
597f9134 2103 strbuf_addstr(&buf, alt->path);
b0a42642
JM
2104 r = for_each_loose_file_in_objdir_buf(&buf,
2105 data->cb, NULL, NULL,
2106 data->data);
2107 strbuf_release(&buf);
2108 return r;
660c889e
JK
2109}
2110
1385bb7b 2111int for_each_loose_object(each_loose_object_fn cb, void *data, unsigned flags)
660c889e
JK
2112{
2113 struct loose_alt_odb_data alt;
2114 int r;
2115
2116 r = for_each_loose_file_in_objdir(get_object_directory(),
2117 cb, NULL, NULL, data);
2118 if (r)
2119 return r;
2120
1385bb7b
JK
2121 if (flags & FOR_EACH_OBJECT_LOCAL_ONLY)
2122 return 0;
2123
660c889e
JK
2124 alt.cb = cb;
2125 alt.data = data;
2126 return foreach_alt_odb(loose_from_alt_odb, &alt);
2127}
2128
f6371f92
JK
2129static int check_stream_sha1(git_zstream *stream,
2130 const char *hdr,
2131 unsigned long size,
2132 const char *path,
2133 const unsigned char *expected_sha1)
2134{
18e2588e 2135 git_hash_ctx c;
cd02599c 2136 unsigned char real_sha1[GIT_MAX_RAWSZ];
f6371f92
JK
2137 unsigned char buf[4096];
2138 unsigned long total_read;
2139 int status = Z_OK;
2140
18e2588e 2141 the_hash_algo->init_fn(&c);
2142 the_hash_algo->update_fn(&c, hdr, stream->total_out);
f6371f92
JK
2143
2144 /*
2145 * We already read some bytes into hdr, but the ones up to the NUL
2146 * do not count against the object's content size.
2147 */
2148 total_read = stream->total_out - strlen(hdr) - 1;
2149
2150 /*
2151 * This size comparison must be "<=" to read the final zlib packets;
2152 * see the comment in unpack_sha1_rest for details.
2153 */
2154 while (total_read <= size &&
2155 (status == Z_OK || status == Z_BUF_ERROR)) {
2156 stream->next_out = buf;
2157 stream->avail_out = sizeof(buf);
2158 if (size - total_read < stream->avail_out)
2159 stream->avail_out = size - total_read;
2160 status = git_inflate(stream, Z_FINISH);
18e2588e 2161 the_hash_algo->update_fn(&c, buf, stream->next_out - buf);
f6371f92
JK
2162 total_read += stream->next_out - buf;
2163 }
2164 git_inflate_end(stream);
2165
2166 if (status != Z_STREAM_END) {
2167 error("corrupt loose object '%s'", sha1_to_hex(expected_sha1));
2168 return -1;
2169 }
cce044df
JK
2170 if (stream->avail_in) {
2171 error("garbage at end of loose object '%s'",
2172 sha1_to_hex(expected_sha1));
2173 return -1;
2174 }
f6371f92 2175
18e2588e 2176 the_hash_algo->final_fn(real_sha1, &c);
f6371f92
JK
2177 if (hashcmp(expected_sha1, real_sha1)) {
2178 error("sha1 mismatch for %s (expected %s)", path,
2179 sha1_to_hex(expected_sha1));
2180 return -1;
2181 }
2182
2183 return 0;
2184}
2185
2186int read_loose_object(const char *path,
d61d87bd 2187 const struct object_id *expected_oid,
f6371f92
JK
2188 enum object_type *type,
2189 unsigned long *size,
2190 void **contents)
2191{
2192 int ret = -1;
f6371f92
JK
2193 void *map = NULL;
2194 unsigned long mapsize;
2195 git_zstream stream;
2196 char hdr[32];
2197
2198 *contents = NULL;
2199
2200 map = map_sha1_file_1(path, NULL, &mapsize);
2201 if (!map) {
2202 error_errno("unable to mmap %s", path);
2203 goto out;
2204 }
2205
2206 if (unpack_sha1_header(&stream, map, mapsize, hdr, sizeof(hdr)) < 0) {
2207 error("unable to unpack header of %s", path);
2208 goto out;
2209 }
2210
2211 *type = parse_sha1_header(hdr, size);
2212 if (*type < 0) {
2213 error("unable to parse header of %s", path);
2214 git_inflate_end(&stream);
2215 goto out;
2216 }
2217
2218 if (*type == OBJ_BLOB) {
d61d87bd 2219 if (check_stream_sha1(&stream, hdr, *size, path, expected_oid->hash) < 0)
f6371f92
JK
2220 goto out;
2221 } else {
d61d87bd 2222 *contents = unpack_sha1_rest(&stream, hdr, *size, expected_oid->hash);
f6371f92
JK
2223 if (!*contents) {
2224 error("unable to unpack contents of %s", path);
2225 git_inflate_end(&stream);
2226 goto out;
2227 }
17e65451 2228 if (check_object_signature(expected_oid, *contents,
debca9d2 2229 *size, type_name(*type))) {
f6371f92 2230 error("sha1 mismatch for %s (expected %s)", path,
d61d87bd 2231 oid_to_hex(expected_oid));
f6371f92
JK
2232 free(*contents);
2233 goto out;
2234 }
2235 }
2236
2237 ret = 0; /* everything checks out */
2238
2239out:
2240 if (map)
2241 munmap(map, mapsize);
f6371f92
JK
2242 return ret;
2243}