2 * GIT - The information manager from hell
4 * Copyright (C) Linus Torvalds, 2005
6 * This handles basic git sha1 object files - packing, unpacking,
14 #include "run-command.h"
17 #include "tree-walk.h"
19 #include "pack-revindex.h"
20 #include "sha1-lookup.h"
23 #if defined(__linux__) && (defined(__i386__) || defined(__PPC__))
24 #define O_NOATIME 01000000
30 #define SZ_FMT PRIuMAX
31 static inline uintmax_t sz_fmt(size_t s
) { return s
; }
33 const unsigned char null_sha1
[20];
36 * This is meant to hold a *small* number of objects that you would
37 * want read_sha1_file() to be able to return, but yet you do not want
38 * to write them into the object store (e.g. a browse-only
41 static struct cached_object
{
42 unsigned char sha1
[20];
43 enum object_type type
;
47 static int cached_object_nr
, cached_object_alloc
;
49 static struct cached_object empty_tree
= {
50 EMPTY_TREE_SHA1_BIN_LITERAL
,
56 static struct cached_object
*find_cached_object(const unsigned char *sha1
)
59 struct cached_object
*co
= cached_objects
;
61 for (i
= 0; i
< cached_object_nr
; i
++, co
++) {
62 if (!hashcmp(co
->sha1
, sha1
))
65 if (!hashcmp(sha1
, empty_tree
.sha1
))
70 int mkdir_in_gitdir(const char *path
)
72 if (mkdir(path
, 0777)) {
73 int saved_errno
= errno
;
75 struct strbuf sb
= STRBUF_INIT
;
80 * Are we looking at a path in a symlinked worktree
81 * whose original repository does not yet have it?
82 * e.g. .git/rr-cache pointing at its original
83 * repository in which the user hasn't performed any
84 * conflict resolution yet?
86 if (lstat(path
, &st
) || !S_ISLNK(st
.st_mode
) ||
87 strbuf_readlink(&sb
, path
, st
.st_size
) ||
88 !is_absolute_path(sb
.buf
) ||
89 mkdir(sb
.buf
, 0777)) {
96 return adjust_shared_perm(path
);
99 int safe_create_leading_directories(char *path
)
101 char *pos
= path
+ offset_1st_component(path
);
105 pos
= strchr(pos
, '/');
108 while (*++pos
== '/')
113 if (!stat(path
, &st
)) {
115 if (!S_ISDIR(st
.st_mode
)) {
120 else if (mkdir(path
, 0777)) {
124 else if (adjust_shared_perm(path
)) {
133 int safe_create_leading_directories_const(const char *path
)
135 /* path points to cache entries, so xstrdup before messing with it */
136 char *buf
= xstrdup(path
);
137 int result
= safe_create_leading_directories(buf
);
142 static void fill_sha1_path(char *pathbuf
, const unsigned char *sha1
)
145 for (i
= 0; i
< 20; i
++) {
146 static char hex
[] = "0123456789abcdef";
147 unsigned int val
= sha1
[i
];
148 char *pos
= pathbuf
+ i
*2 + (i
> 0);
149 *pos
++ = hex
[val
>> 4];
150 *pos
= hex
[val
& 0xf];
155 * NOTE! This returns a statically allocated buffer, so you have to be
156 * careful about using it. Do an "xstrdup()" if you need to save the
159 * Also note that this returns the location for creating. Reading
160 * SHA1 file can happen from any alternate directory listed in the
161 * DB_ENVIRONMENT environment variable if it is not found in
162 * the primary object database.
164 char *sha1_file_name(const unsigned char *sha1
)
166 static char buf
[PATH_MAX
];
170 objdir
= get_object_directory();
171 len
= strlen(objdir
);
173 /* '/' + sha1(2) + '/' + sha1(38) + '\0' */
174 if (len
+ 43 > PATH_MAX
)
175 die("insanely long object directory %s", objdir
);
176 memcpy(buf
, objdir
, len
);
180 fill_sha1_path(buf
+ len
+ 1, sha1
);
184 static char *sha1_get_pack_name(const unsigned char *sha1
,
185 char **name
, char **base
, const char *which
)
187 static const char hex
[] = "0123456789abcdef";
192 const char *sha1_file_directory
= get_object_directory();
193 int len
= strlen(sha1_file_directory
);
194 *base
= xmalloc(len
+ 60);
195 sprintf(*base
, "%s/pack/pack-1234567890123456789012345678901234567890.%s",
196 sha1_file_directory
, which
);
197 *name
= *base
+ len
+ 11;
202 for (i
= 0; i
< 20; i
++) {
203 unsigned int val
= *sha1
++;
204 *buf
++ = hex
[val
>> 4];
205 *buf
++ = hex
[val
& 0xf];
211 char *sha1_pack_name(const unsigned char *sha1
)
213 static char *name
, *base
;
215 return sha1_get_pack_name(sha1
, &name
, &base
, "pack");
218 char *sha1_pack_index_name(const unsigned char *sha1
)
220 static char *name
, *base
;
222 return sha1_get_pack_name(sha1
, &name
, &base
, "idx");
225 struct alternate_object_database
*alt_odb_list
;
226 static struct alternate_object_database
**alt_odb_tail
;
228 static void read_info_alternates(const char * alternates
, int depth
);
229 static int git_open_noatime(const char *name
);
232 * Prepare alternate object database registry.
234 * The variable alt_odb_list points at the list of struct
235 * alternate_object_database. The elements on this list come from
236 * non-empty elements from colon separated ALTERNATE_DB_ENVIRONMENT
237 * environment variable, and $GIT_OBJECT_DIRECTORY/info/alternates,
238 * whose contents is similar to that environment variable but can be
239 * LF separated. Its base points at a statically allocated buffer that
240 * contains "/the/directory/corresponding/to/.git/objects/...", while
241 * its name points just after the slash at the end of ".git/objects/"
242 * in the example above, and has enough space to hold 40-byte hex
243 * SHA1, an extra slash for the first level indirection, and the
246 static int link_alt_odb_entry(const char * entry
, int len
, const char * relative_base
, int depth
)
248 const char *objdir
= get_object_directory();
249 struct alternate_object_database
*ent
;
250 struct alternate_object_database
*alt
;
251 /* 43 = 40-byte + 2 '/' + terminating NUL */
253 int entlen
= pfxlen
+ 43;
256 if (!is_absolute_path(entry
) && relative_base
) {
257 /* Relative alt-odb */
259 base_len
= strlen(relative_base
) + 1;
263 ent
= xmalloc(sizeof(*ent
) + entlen
);
265 if (!is_absolute_path(entry
) && relative_base
) {
266 memcpy(ent
->base
, relative_base
, base_len
- 1);
267 ent
->base
[base_len
- 1] = '/';
268 memcpy(ent
->base
+ base_len
, entry
, len
);
271 memcpy(ent
->base
, entry
, pfxlen
);
273 ent
->name
= ent
->base
+ pfxlen
+ 1;
274 ent
->base
[pfxlen
+ 3] = '/';
275 ent
->base
[pfxlen
] = ent
->base
[entlen
-1] = 0;
277 /* Detect cases where alternate disappeared */
278 if (!is_directory(ent
->base
)) {
279 error("object directory %s does not exist; "
280 "check .git/objects/info/alternates.",
286 /* Prevent the common mistake of listing the same
287 * thing twice, or object directory itself.
289 for (alt
= alt_odb_list
; alt
; alt
= alt
->next
) {
290 if (!memcmp(ent
->base
, alt
->base
, pfxlen
)) {
295 if (!memcmp(ent
->base
, objdir
, pfxlen
)) {
300 /* add the alternate entry */
302 alt_odb_tail
= &(ent
->next
);
305 /* recursively add alternates */
306 read_info_alternates(ent
->base
, depth
+ 1);
308 ent
->base
[pfxlen
] = '/';
313 static void link_alt_odb_entries(const char *alt
, const char *ep
, int sep
,
314 const char *relative_base
, int depth
)
316 const char *cp
, *last
;
319 error("%s: ignoring alternate object stores, nesting too deep.",
327 if (cp
< ep
&& *cp
== '#') {
328 while (cp
< ep
&& *cp
!= sep
)
333 while (cp
< ep
&& *cp
!= sep
)
336 if (!is_absolute_path(last
) && depth
) {
337 error("%s: ignoring relative alternate object store %s",
338 relative_base
, last
);
340 link_alt_odb_entry(last
, cp
- last
,
341 relative_base
, depth
);
344 while (cp
< ep
&& *cp
== sep
)
350 static void read_info_alternates(const char * relative_base
, int depth
)
355 const char alt_file_name
[] = "info/alternates";
356 /* Given that relative_base is no longer than PATH_MAX,
357 ensure that "path" has enough space to append "/", the
358 file name, "info/alternates", and a trailing NUL. */
359 char path
[PATH_MAX
+ 1 + sizeof alt_file_name
];
362 sprintf(path
, "%s/%s", relative_base
, alt_file_name
);
363 fd
= git_open_noatime(path
);
366 if (fstat(fd
, &st
) || (st
.st_size
== 0)) {
370 mapsz
= xsize_t(st
.st_size
);
371 map
= xmmap(NULL
, mapsz
, PROT_READ
, MAP_PRIVATE
, fd
, 0);
374 link_alt_odb_entries(map
, map
+ mapsz
, '\n', relative_base
, depth
);
379 void add_to_alternates_file(const char *reference
)
381 struct lock_file
*lock
= xcalloc(1, sizeof(struct lock_file
));
382 int fd
= hold_lock_file_for_append(lock
, git_path("objects/info/alternates"), LOCK_DIE_ON_ERROR
);
383 char *alt
= mkpath("%s/objects\n", reference
);
384 write_or_die(fd
, alt
, strlen(alt
));
385 if (commit_lock_file(lock
))
386 die("could not close alternates file");
388 link_alt_odb_entries(alt
, alt
+ strlen(alt
), '\n', NULL
, 0);
391 void foreach_alt_odb(alt_odb_fn fn
, void *cb
)
393 struct alternate_object_database
*ent
;
396 for (ent
= alt_odb_list
; ent
; ent
= ent
->next
)
401 void prepare_alt_odb(void)
408 alt
= getenv(ALTERNATE_DB_ENVIRONMENT
);
411 alt_odb_tail
= &alt_odb_list
;
412 link_alt_odb_entries(alt
, alt
+ strlen(alt
), PATH_SEP
, NULL
, 0);
414 read_info_alternates(get_object_directory(), 0);
417 static int has_loose_object_local(const unsigned char *sha1
)
419 char *name
= sha1_file_name(sha1
);
420 return !access(name
, F_OK
);
423 int has_loose_object_nonlocal(const unsigned char *sha1
)
425 struct alternate_object_database
*alt
;
427 for (alt
= alt_odb_list
; alt
; alt
= alt
->next
) {
428 fill_sha1_path(alt
->name
, sha1
);
429 if (!access(alt
->base
, F_OK
))
435 static int has_loose_object(const unsigned char *sha1
)
437 return has_loose_object_local(sha1
) ||
438 has_loose_object_nonlocal(sha1
);
441 static unsigned int pack_used_ctr
;
442 static unsigned int pack_mmap_calls
;
443 static unsigned int peak_pack_open_windows
;
444 static unsigned int pack_open_windows
;
445 static unsigned int pack_open_fds
;
446 static unsigned int pack_max_fds
;
447 static size_t peak_pack_mapped
;
448 static size_t pack_mapped
;
449 struct packed_git
*packed_git
;
451 void pack_report(void)
454 "pack_report: getpagesize() = %10" SZ_FMT
"\n"
455 "pack_report: core.packedGitWindowSize = %10" SZ_FMT
"\n"
456 "pack_report: core.packedGitLimit = %10" SZ_FMT
"\n",
457 sz_fmt(getpagesize()),
458 sz_fmt(packed_git_window_size
),
459 sz_fmt(packed_git_limit
));
461 "pack_report: pack_used_ctr = %10u\n"
462 "pack_report: pack_mmap_calls = %10u\n"
463 "pack_report: pack_open_windows = %10u / %10u\n"
464 "pack_report: pack_mapped = "
465 "%10" SZ_FMT
" / %10" SZ_FMT
"\n",
468 pack_open_windows
, peak_pack_open_windows
,
469 sz_fmt(pack_mapped
), sz_fmt(peak_pack_mapped
));
472 static int check_packed_git_idx(const char *path
, struct packed_git
*p
)
475 struct pack_idx_header
*hdr
;
477 uint32_t version
, nr
, i
, *index
;
478 int fd
= git_open_noatime(path
);
483 if (fstat(fd
, &st
)) {
487 idx_size
= xsize_t(st
.st_size
);
488 if (idx_size
< 4 * 256 + 20 + 20) {
490 return error("index file %s is too small", path
);
492 idx_map
= xmmap(NULL
, idx_size
, PROT_READ
, MAP_PRIVATE
, fd
, 0);
496 if (hdr
->idx_signature
== htonl(PACK_IDX_SIGNATURE
)) {
497 version
= ntohl(hdr
->idx_version
);
498 if (version
< 2 || version
> 2) {
499 munmap(idx_map
, idx_size
);
500 return error("index file %s is version %"PRIu32
501 " and is not supported by this binary"
502 " (try upgrading GIT to a newer version)",
511 index
+= 2; /* skip index header */
512 for (i
= 0; i
< 256; i
++) {
513 uint32_t n
= ntohl(index
[i
]);
515 munmap(idx_map
, idx_size
);
516 return error("non-monotonic index %s", path
);
524 * - 256 index entries 4 bytes each
525 * - 24-byte entries * nr (20-byte sha1 + 4-byte offset)
526 * - 20-byte SHA1 of the packfile
527 * - 20-byte SHA1 file checksum
529 if (idx_size
!= 4*256 + nr
* 24 + 20 + 20) {
530 munmap(idx_map
, idx_size
);
531 return error("wrong index v1 file size in %s", path
);
533 } else if (version
== 2) {
536 * - 8 bytes of header
537 * - 256 index entries 4 bytes each
538 * - 20-byte sha1 entry * nr
539 * - 4-byte crc entry * nr
540 * - 4-byte offset entry * nr
541 * - 20-byte SHA1 of the packfile
542 * - 20-byte SHA1 file checksum
543 * And after the 4-byte offset table might be a
544 * variable sized table containing 8-byte entries
545 * for offsets larger than 2^31.
547 unsigned long min_size
= 8 + 4*256 + nr
*(20 + 4 + 4) + 20 + 20;
548 unsigned long max_size
= min_size
;
550 max_size
+= (nr
- 1)*8;
551 if (idx_size
< min_size
|| idx_size
> max_size
) {
552 munmap(idx_map
, idx_size
);
553 return error("wrong index v2 file size in %s", path
);
555 if (idx_size
!= min_size
&&
557 * make sure we can deal with large pack offsets.
558 * 31-bit signed offset won't be enough, neither
559 * 32-bit unsigned one will be.
561 (sizeof(off_t
) <= 4)) {
562 munmap(idx_map
, idx_size
);
563 return error("pack too large for current definition of off_t in %s", path
);
567 p
->index_version
= version
;
568 p
->index_data
= idx_map
;
569 p
->index_size
= idx_size
;
574 int open_pack_index(struct packed_git
*p
)
582 idx_name
= xstrdup(p
->pack_name
);
583 strcpy(idx_name
+ strlen(idx_name
) - strlen(".pack"), ".idx");
584 ret
= check_packed_git_idx(idx_name
, p
);
589 static void scan_windows(struct packed_git
*p
,
590 struct packed_git
**lru_p
,
591 struct pack_window
**lru_w
,
592 struct pack_window
**lru_l
)
594 struct pack_window
*w
, *w_l
;
596 for (w_l
= NULL
, w
= p
->windows
; w
; w
= w
->next
) {
598 if (!*lru_w
|| w
->last_used
< (*lru_w
)->last_used
) {
608 static int unuse_one_window(struct packed_git
*current
, int keep_fd
)
610 struct packed_git
*p
, *lru_p
= NULL
;
611 struct pack_window
*lru_w
= NULL
, *lru_l
= NULL
;
614 scan_windows(current
, &lru_p
, &lru_w
, &lru_l
);
615 for (p
= packed_git
; p
; p
= p
->next
)
616 scan_windows(p
, &lru_p
, &lru_w
, &lru_l
);
618 munmap(lru_w
->base
, lru_w
->len
);
619 pack_mapped
-= lru_w
->len
;
621 lru_l
->next
= lru_w
->next
;
623 lru_p
->windows
= lru_w
->next
;
624 if (!lru_p
->windows
&& lru_p
->pack_fd
!= -1
625 && lru_p
->pack_fd
!= keep_fd
) {
626 close(lru_p
->pack_fd
);
638 void release_pack_memory(size_t need
, int fd
)
640 size_t cur
= pack_mapped
;
641 while (need
>= (cur
- pack_mapped
) && unuse_one_window(NULL
, fd
))
645 void *xmmap(void *start
, size_t length
,
646 int prot
, int flags
, int fd
, off_t offset
)
648 void *ret
= mmap(start
, length
, prot
, flags
, fd
, offset
);
649 if (ret
== MAP_FAILED
) {
652 release_pack_memory(length
, fd
);
653 ret
= mmap(start
, length
, prot
, flags
, fd
, offset
);
654 if (ret
== MAP_FAILED
)
655 die_errno("Out of memory? mmap failed");
660 void close_pack_windows(struct packed_git
*p
)
663 struct pack_window
*w
= p
->windows
;
666 die("pack '%s' still has open windows to it",
668 munmap(w
->base
, w
->len
);
669 pack_mapped
-= w
->len
;
671 p
->windows
= w
->next
;
676 void unuse_pack(struct pack_window
**w_cursor
)
678 struct pack_window
*w
= *w_cursor
;
685 void close_pack_index(struct packed_git
*p
)
688 munmap((void *)p
->index_data
, p
->index_size
);
689 p
->index_data
= NULL
;
694 * This is used by git-repack in case a newly created pack happens to
695 * contain the same set of objects as an existing one. In that case
696 * the resulting file might be different even if its name would be the
697 * same. It is best to close any reference to the old pack before it is
698 * replaced on disk. Of course no index pointers nor windows for given pack
699 * must subsist at this point. If ever objects from this pack are requested
700 * again, the new version of the pack will be reinitialized through
701 * reprepare_packed_git().
703 void free_pack_by_name(const char *pack_name
)
705 struct packed_git
*p
, **pp
= &packed_git
;
709 if (strcmp(pack_name
, p
->pack_name
) == 0) {
710 clear_delta_base_cache();
711 close_pack_windows(p
);
712 if (p
->pack_fd
!= -1) {
717 free(p
->bad_object_sha1
);
727 * Do not call this directly as this leaks p->pack_fd on error return;
728 * call open_packed_git() instead.
730 static int open_packed_git_1(struct packed_git
*p
)
733 struct pack_header hdr
;
734 unsigned char sha1
[20];
735 unsigned char *idx_sha1
;
738 if (!p
->index_data
&& open_pack_index(p
))
739 return error("packfile %s index unavailable", p
->pack_name
);
743 unsigned int max_fds
;
745 if (getrlimit(RLIMIT_NOFILE
, &lim
))
746 die_errno("cannot get RLIMIT_NOFILE");
748 max_fds
= lim
.rlim_cur
;
750 /* Save 3 for stdin/stdout/stderr, 22 for work */
752 pack_max_fds
= max_fds
- 25;
757 while (pack_max_fds
<= pack_open_fds
&& unuse_one_window(NULL
, -1))
760 p
->pack_fd
= git_open_noatime(p
->pack_name
);
761 if (p
->pack_fd
< 0 || fstat(p
->pack_fd
, &st
))
765 /* If we created the struct before we had the pack we lack size. */
767 if (!S_ISREG(st
.st_mode
))
768 return error("packfile %s not a regular file", p
->pack_name
);
769 p
->pack_size
= st
.st_size
;
770 } else if (p
->pack_size
!= st
.st_size
)
771 return error("packfile %s size changed", p
->pack_name
);
773 /* We leave these file descriptors open with sliding mmap;
774 * there is no point keeping them open across exec(), though.
776 fd_flag
= fcntl(p
->pack_fd
, F_GETFD
, 0);
778 return error("cannot determine file descriptor flags");
779 fd_flag
|= FD_CLOEXEC
;
780 if (fcntl(p
->pack_fd
, F_SETFD
, fd_flag
) == -1)
781 return error("cannot set FD_CLOEXEC");
783 /* Verify we recognize this pack file format. */
784 if (read_in_full(p
->pack_fd
, &hdr
, sizeof(hdr
)) != sizeof(hdr
))
785 return error("file %s is far too short to be a packfile", p
->pack_name
);
786 if (hdr
.hdr_signature
!= htonl(PACK_SIGNATURE
))
787 return error("file %s is not a GIT packfile", p
->pack_name
);
788 if (!pack_version_ok(hdr
.hdr_version
))
789 return error("packfile %s is version %"PRIu32
" and not"
790 " supported (try upgrading GIT to a newer version)",
791 p
->pack_name
, ntohl(hdr
.hdr_version
));
793 /* Verify the pack matches its index. */
794 if (p
->num_objects
!= ntohl(hdr
.hdr_entries
))
795 return error("packfile %s claims to have %"PRIu32
" objects"
796 " while index indicates %"PRIu32
" objects",
797 p
->pack_name
, ntohl(hdr
.hdr_entries
),
799 if (lseek(p
->pack_fd
, p
->pack_size
- sizeof(sha1
), SEEK_SET
) == -1)
800 return error("end of packfile %s is unavailable", p
->pack_name
);
801 if (read_in_full(p
->pack_fd
, sha1
, sizeof(sha1
)) != sizeof(sha1
))
802 return error("packfile %s signature is unavailable", p
->pack_name
);
803 idx_sha1
= ((unsigned char *)p
->index_data
) + p
->index_size
- 40;
804 if (hashcmp(sha1
, idx_sha1
))
805 return error("packfile %s does not match index", p
->pack_name
);
809 static int open_packed_git(struct packed_git
*p
)
811 if (!open_packed_git_1(p
))
813 if (p
->pack_fd
!= -1) {
821 static int in_window(struct pack_window
*win
, off_t offset
)
823 /* We must promise at least 20 bytes (one hash) after the
824 * offset is available from this window, otherwise the offset
825 * is not actually in this window and a different window (which
826 * has that one hash excess) must be used. This is to support
827 * the object header and delta base parsing routines below.
829 off_t win_off
= win
->offset
;
830 return win_off
<= offset
831 && (offset
+ 20) <= (win_off
+ win
->len
);
834 unsigned char *use_pack(struct packed_git
*p
,
835 struct pack_window
**w_cursor
,
839 struct pack_window
*win
= *w_cursor
;
841 /* Since packfiles end in a hash of their content and it's
842 * pointless to ask for an offset into the middle of that
843 * hash, and the in_window function above wouldn't match
844 * don't allow an offset too close to the end of the file.
846 if (!p
->pack_size
&& p
->pack_fd
== -1 && open_packed_git(p
))
847 die("packfile %s cannot be accessed", p
->pack_name
);
848 if (offset
> (p
->pack_size
- 20))
849 die("offset beyond end of packfile (truncated pack?)");
851 if (!win
|| !in_window(win
, offset
)) {
854 for (win
= p
->windows
; win
; win
= win
->next
) {
855 if (in_window(win
, offset
))
859 size_t window_align
= packed_git_window_size
/ 2;
862 if (p
->pack_fd
== -1 && open_packed_git(p
))
863 die("packfile %s cannot be accessed", p
->pack_name
);
865 win
= xcalloc(1, sizeof(*win
));
866 win
->offset
= (offset
/ window_align
) * window_align
;
867 len
= p
->pack_size
- win
->offset
;
868 if (len
> packed_git_window_size
)
869 len
= packed_git_window_size
;
870 win
->len
= (size_t)len
;
871 pack_mapped
+= win
->len
;
872 while (packed_git_limit
< pack_mapped
873 && unuse_one_window(p
, p
->pack_fd
))
875 win
->base
= xmmap(NULL
, win
->len
,
876 PROT_READ
, MAP_PRIVATE
,
877 p
->pack_fd
, win
->offset
);
878 if (win
->base
== MAP_FAILED
)
879 die("packfile %s cannot be mapped: %s",
882 if (!win
->offset
&& win
->len
== p
->pack_size
883 && !p
->do_not_close
) {
890 if (pack_mapped
> peak_pack_mapped
)
891 peak_pack_mapped
= pack_mapped
;
892 if (pack_open_windows
> peak_pack_open_windows
)
893 peak_pack_open_windows
= pack_open_windows
;
894 win
->next
= p
->windows
;
898 if (win
!= *w_cursor
) {
899 win
->last_used
= pack_used_ctr
++;
903 offset
-= win
->offset
;
905 *left
= win
->len
- xsize_t(offset
);
906 return win
->base
+ offset
;
909 static struct packed_git
*alloc_packed_git(int extra
)
911 struct packed_git
*p
= xmalloc(sizeof(*p
) + extra
);
912 memset(p
, 0, sizeof(*p
));
917 static void try_to_free_pack_memory(size_t size
)
919 release_pack_memory(size
, -1);
922 struct packed_git
*add_packed_git(const char *path
, int path_len
, int local
)
924 static int have_set_try_to_free_routine
;
926 struct packed_git
*p
= alloc_packed_git(path_len
+ 2);
928 if (!have_set_try_to_free_routine
) {
929 have_set_try_to_free_routine
= 1;
930 set_try_to_free_routine(try_to_free_pack_memory
);
934 * Make sure a corresponding .pack file exists and that
935 * the index looks sane.
937 path_len
-= strlen(".idx");
942 memcpy(p
->pack_name
, path
, path_len
);
944 strcpy(p
->pack_name
+ path_len
, ".keep");
945 if (!access(p
->pack_name
, F_OK
))
948 strcpy(p
->pack_name
+ path_len
, ".pack");
949 if (stat(p
->pack_name
, &st
) || !S_ISREG(st
.st_mode
)) {
954 /* ok, it looks sane as far as we can check without
955 * actually mapping the pack file.
957 p
->pack_size
= st
.st_size
;
958 p
->pack_local
= local
;
959 p
->mtime
= st
.st_mtime
;
960 if (path_len
< 40 || get_sha1_hex(path
+ path_len
- 40, p
->sha1
))
965 struct packed_git
*parse_pack_index(unsigned char *sha1
, const char *idx_path
)
967 const char *path
= sha1_pack_name(sha1
);
968 struct packed_git
*p
= alloc_packed_git(strlen(path
) + 1);
970 strcpy(p
->pack_name
, path
);
971 hashcpy(p
->sha1
, sha1
);
972 if (check_packed_git_idx(idx_path
, p
)) {
980 void install_packed_git(struct packed_git
*pack
)
982 if (pack
->pack_fd
!= -1)
985 pack
->next
= packed_git
;
989 static void prepare_packed_git_one(char *objdir
, int local
)
991 /* Ensure that this buffer is large enough so that we can
992 append "/pack/" without clobbering the stack even if
993 strlen(objdir) were PATH_MAX. */
994 char path
[PATH_MAX
+ 1 + 4 + 1 + 1];
999 sprintf(path
, "%s/pack", objdir
);
1001 dir
= opendir(path
);
1003 if (errno
!= ENOENT
)
1004 error("unable to open object pack directory: %s: %s",
1005 path
, strerror(errno
));
1009 while ((de
= readdir(dir
)) != NULL
) {
1010 int namelen
= strlen(de
->d_name
);
1011 struct packed_git
*p
;
1013 if (!has_extension(de
->d_name
, ".idx"))
1016 if (len
+ namelen
+ 1 > sizeof(path
))
1019 /* Don't reopen a pack we already have. */
1020 strcpy(path
+ len
, de
->d_name
);
1021 for (p
= packed_git
; p
; p
= p
->next
) {
1022 if (!memcmp(path
, p
->pack_name
, len
+ namelen
- 4))
1027 /* See if it really is a valid .idx file with corresponding
1028 * .pack file that we can map.
1030 p
= add_packed_git(path
, len
+ namelen
, local
);
1033 install_packed_git(p
);
1038 static int sort_pack(const void *a_
, const void *b_
)
1040 struct packed_git
*a
= *((struct packed_git
**)a_
);
1041 struct packed_git
*b
= *((struct packed_git
**)b_
);
1045 * Local packs tend to contain objects specific to our
1046 * variant of the project than remote ones. In addition,
1047 * remote ones could be on a network mounted filesystem.
1048 * Favor local ones for these reasons.
1050 st
= a
->pack_local
- b
->pack_local
;
1055 * Younger packs tend to contain more recent objects,
1056 * and more recent objects tend to get accessed more
1059 if (a
->mtime
< b
->mtime
)
1061 else if (a
->mtime
== b
->mtime
)
1066 static void rearrange_packed_git(void)
1068 struct packed_git
**ary
, *p
;
1071 for (n
= 0, p
= packed_git
; p
; p
= p
->next
)
1076 /* prepare an array of packed_git for easier sorting */
1077 ary
= xcalloc(n
, sizeof(struct packed_git
*));
1078 for (n
= 0, p
= packed_git
; p
; p
= p
->next
)
1081 qsort(ary
, n
, sizeof(struct packed_git
*), sort_pack
);
1083 /* link them back again */
1084 for (i
= 0; i
< n
- 1; i
++)
1085 ary
[i
]->next
= ary
[i
+ 1];
1086 ary
[n
- 1]->next
= NULL
;
1087 packed_git
= ary
[0];
1092 static int prepare_packed_git_run_once
= 0;
1093 void prepare_packed_git(void)
1095 struct alternate_object_database
*alt
;
1097 if (prepare_packed_git_run_once
)
1099 prepare_packed_git_one(get_object_directory(), 1);
1101 for (alt
= alt_odb_list
; alt
; alt
= alt
->next
) {
1103 prepare_packed_git_one(alt
->base
, 0);
1104 alt
->name
[-1] = '/';
1106 rearrange_packed_git();
1107 prepare_packed_git_run_once
= 1;
1110 void reprepare_packed_git(void)
1113 prepare_packed_git_run_once
= 0;
1114 prepare_packed_git();
1117 static void mark_bad_packed_object(struct packed_git
*p
,
1118 const unsigned char *sha1
)
1121 for (i
= 0; i
< p
->num_bad_objects
; i
++)
1122 if (!hashcmp(sha1
, p
->bad_object_sha1
+ 20 * i
))
1124 p
->bad_object_sha1
= xrealloc(p
->bad_object_sha1
, 20 * (p
->num_bad_objects
+ 1));
1125 hashcpy(p
->bad_object_sha1
+ 20 * p
->num_bad_objects
, sha1
);
1126 p
->num_bad_objects
++;
1129 static const struct packed_git
*has_packed_and_bad(const unsigned char *sha1
)
1131 struct packed_git
*p
;
1134 for (p
= packed_git
; p
; p
= p
->next
)
1135 for (i
= 0; i
< p
->num_bad_objects
; i
++)
1136 if (!hashcmp(sha1
, p
->bad_object_sha1
+ 20 * i
))
1141 int check_sha1_signature(const unsigned char *sha1
, void *map
, unsigned long size
, const char *type
)
1143 unsigned char real_sha1
[20];
1144 hash_sha1_file(map
, size
, type
, real_sha1
);
1145 return hashcmp(sha1
, real_sha1
) ? -1 : 0;
1148 static int git_open_noatime(const char *name
)
1150 static int sha1_file_open_flag
= O_NOATIME
;
1153 int fd
= open(name
, O_RDONLY
| sha1_file_open_flag
);
1157 /* Might the failure be due to O_NOATIME? */
1158 if (errno
!= ENOENT
&& sha1_file_open_flag
) {
1159 sha1_file_open_flag
= 0;
1167 static int open_sha1_file(const unsigned char *sha1
)
1170 char *name
= sha1_file_name(sha1
);
1171 struct alternate_object_database
*alt
;
1173 fd
= git_open_noatime(name
);
1179 for (alt
= alt_odb_list
; alt
; alt
= alt
->next
) {
1181 fill_sha1_path(name
, sha1
);
1182 fd
= git_open_noatime(alt
->base
);
1189 static void *map_sha1_file(const unsigned char *sha1
, unsigned long *size
)
1194 fd
= open_sha1_file(sha1
);
1199 if (!fstat(fd
, &st
)) {
1200 *size
= xsize_t(st
.st_size
);
1201 map
= xmmap(NULL
, *size
, PROT_READ
, MAP_PRIVATE
, fd
, 0);
1208 static int legacy_loose_object(unsigned char *map
)
1213 * Is it a zlib-compressed buffer? If so, the first byte
1214 * must be 0x78 (15-bit window size, deflated), and the
1215 * first 16-bit word is evenly divisible by 31
1217 word
= (map
[0] << 8) + map
[1];
1218 if (map
[0] == 0x78 && !(word
% 31))
1224 unsigned long unpack_object_header_buffer(const unsigned char *buf
,
1225 unsigned long len
, enum object_type
*type
, unsigned long *sizep
)
1228 unsigned long size
, c
;
1229 unsigned long used
= 0;
1232 *type
= (c
>> 4) & 7;
1236 if (len
<= used
|| bitsizeof(long) <= shift
) {
1237 error("bad object header");
1241 size
+= (c
& 0x7f) << shift
;
1248 static int unpack_sha1_header(z_stream
*stream
, unsigned char *map
, unsigned long mapsize
, void *buffer
, unsigned long bufsiz
)
1250 unsigned long size
, used
;
1251 static const char valid_loose_object_type
[8] = {
1253 1, 1, 1, 1, /* "commit", "tree", "blob", "tag" */
1254 0, /* "delta" and others are invalid in a loose object */
1256 enum object_type type
;
1258 /* Get the data stream */
1259 memset(stream
, 0, sizeof(*stream
));
1260 stream
->next_in
= map
;
1261 stream
->avail_in
= mapsize
;
1262 stream
->next_out
= buffer
;
1263 stream
->avail_out
= bufsiz
;
1265 if (legacy_loose_object(map
)) {
1266 git_inflate_init(stream
);
1267 return git_inflate(stream
, 0);
1272 * There used to be a second loose object header format which
1273 * was meant to mimic the in-pack format, allowing for direct
1274 * copy of the object data. This format turned up not to be
1275 * really worth it and we don't write it any longer. But we
1276 * can still read it.
1278 used
= unpack_object_header_buffer(map
, mapsize
, &type
, &size
);
1279 if (!used
|| !valid_loose_object_type
[type
])
1284 /* Set up the stream for the rest.. */
1285 stream
->next_in
= map
;
1286 stream
->avail_in
= mapsize
;
1287 git_inflate_init(stream
);
1289 /* And generate the fake traditional header */
1290 stream
->total_out
= 1 + snprintf(buffer
, bufsiz
, "%s %lu",
1291 typename(type
), size
);
1295 static void *unpack_sha1_rest(z_stream
*stream
, void *buffer
, unsigned long size
, const unsigned char *sha1
)
1297 int bytes
= strlen(buffer
) + 1;
1298 unsigned char *buf
= xmallocz(size
);
1302 n
= stream
->total_out
- bytes
;
1305 memcpy(buf
, (char *) buffer
+ bytes
, n
);
1307 if (bytes
<= size
) {
1309 * The above condition must be (bytes <= size), not
1310 * (bytes < size). In other words, even though we
1311 * expect no more output and set avail_out to zero,
1312 * the input zlib stream may have bytes that express
1313 * "this concludes the stream", and we *do* want to
1316 * Otherwise we would not be able to test that we
1317 * consumed all the input to reach the expected size;
1318 * we also want to check that zlib tells us that all
1319 * went well with status == Z_STREAM_END at the end.
1321 stream
->next_out
= buf
+ bytes
;
1322 stream
->avail_out
= size
- bytes
;
1323 while (status
== Z_OK
)
1324 status
= git_inflate(stream
, Z_FINISH
);
1326 if (status
== Z_STREAM_END
&& !stream
->avail_in
) {
1327 git_inflate_end(stream
);
1332 error("corrupt loose object '%s'", sha1_to_hex(sha1
));
1333 else if (stream
->avail_in
)
1334 error("garbage at end of loose object '%s'",
1341 * We used to just use "sscanf()", but that's actually way
1342 * too permissive for what we want to check. So do an anal
1343 * object header parse by hand.
1345 static int parse_sha1_header(const char *hdr
, unsigned long *sizep
)
1352 * The type can be at most ten bytes (including the
1353 * terminating '\0' that we add), and is followed by
1362 if (i
>= sizeof(type
))
1368 * The length must follow immediately, and be in canonical
1369 * decimal format (ie "010" is not valid).
1371 size
= *hdr
++ - '0';
1376 unsigned long c
= *hdr
- '0';
1380 size
= size
* 10 + c
;
1386 * The length must be followed by a zero byte
1388 return *hdr
? -1 : type_from_string(type
);
1391 static void *unpack_sha1_file(void *map
, unsigned long mapsize
, enum object_type
*type
, unsigned long *size
, const unsigned char *sha1
)
1397 ret
= unpack_sha1_header(&stream
, map
, mapsize
, hdr
, sizeof(hdr
));
1398 if (ret
< Z_OK
|| (*type
= parse_sha1_header(hdr
, size
)) < 0)
1401 return unpack_sha1_rest(&stream
, hdr
, *size
, sha1
);
1404 unsigned long get_size_from_delta(struct packed_git
*p
,
1405 struct pack_window
**w_curs
,
1408 const unsigned char *data
;
1409 unsigned char delta_head
[20], *in
;
1413 memset(&stream
, 0, sizeof(stream
));
1414 stream
.next_out
= delta_head
;
1415 stream
.avail_out
= sizeof(delta_head
);
1417 git_inflate_init(&stream
);
1419 in
= use_pack(p
, w_curs
, curpos
, &stream
.avail_in
);
1420 stream
.next_in
= in
;
1421 st
= git_inflate(&stream
, Z_FINISH
);
1422 curpos
+= stream
.next_in
- in
;
1423 } while ((st
== Z_OK
|| st
== Z_BUF_ERROR
) &&
1424 stream
.total_out
< sizeof(delta_head
));
1425 git_inflate_end(&stream
);
1426 if ((st
!= Z_STREAM_END
) && stream
.total_out
!= sizeof(delta_head
)) {
1427 error("delta data unpack-initial failed");
1431 /* Examine the initial part of the delta to figure out
1436 /* ignore base size */
1437 get_delta_hdr_size(&data
, delta_head
+sizeof(delta_head
));
1439 /* Read the result size */
1440 return get_delta_hdr_size(&data
, delta_head
+sizeof(delta_head
));
1443 static off_t
get_delta_base(struct packed_git
*p
,
1444 struct pack_window
**w_curs
,
1446 enum object_type type
,
1447 off_t delta_obj_offset
)
1449 unsigned char *base_info
= use_pack(p
, w_curs
, *curpos
, NULL
);
1452 /* use_pack() assured us we have [base_info, base_info + 20)
1453 * as a range that we can look at without walking off the
1454 * end of the mapped window. Its actually the hash size
1455 * that is assured. An OFS_DELTA longer than the hash size
1456 * is stupid, as then a REF_DELTA would be smaller to store.
1458 if (type
== OBJ_OFS_DELTA
) {
1460 unsigned char c
= base_info
[used
++];
1461 base_offset
= c
& 127;
1464 if (!base_offset
|| MSB(base_offset
, 7))
1465 return 0; /* overflow */
1466 c
= base_info
[used
++];
1467 base_offset
= (base_offset
<< 7) + (c
& 127);
1469 base_offset
= delta_obj_offset
- base_offset
;
1470 if (base_offset
<= 0 || base_offset
>= delta_obj_offset
)
1471 return 0; /* out of bound */
1473 } else if (type
== OBJ_REF_DELTA
) {
1474 /* The base entry _must_ be in the same pack */
1475 base_offset
= find_pack_entry_one(base_info
, p
);
1478 die("I am totally screwed");
1482 /* forward declaration for a mutually recursive function */
1483 static int packed_object_info(struct packed_git
*p
, off_t offset
,
1484 unsigned long *sizep
, int *rtype
);
1486 static int packed_delta_info(struct packed_git
*p
,
1487 struct pack_window
**w_curs
,
1489 enum object_type type
,
1491 unsigned long *sizep
)
1495 base_offset
= get_delta_base(p
, w_curs
, &curpos
, type
, obj_offset
);
1498 type
= packed_object_info(p
, base_offset
, NULL
, NULL
);
1499 if (type
<= OBJ_NONE
) {
1500 struct revindex_entry
*revidx
;
1501 const unsigned char *base_sha1
;
1502 revidx
= find_pack_revindex(p
, base_offset
);
1505 base_sha1
= nth_packed_object_sha1(p
, revidx
->nr
);
1506 mark_bad_packed_object(p
, base_sha1
);
1507 type
= sha1_object_info(base_sha1
, NULL
);
1508 if (type
<= OBJ_NONE
)
1512 /* We choose to only get the type of the base object and
1513 * ignore potentially corrupt pack file that expects the delta
1514 * based on a base with a wrong size. This saves tons of
1518 *sizep
= get_size_from_delta(p
, w_curs
, curpos
);
1526 static int unpack_object_header(struct packed_git
*p
,
1527 struct pack_window
**w_curs
,
1529 unsigned long *sizep
)
1531 unsigned char *base
;
1534 enum object_type type
;
1536 /* use_pack() assures us we have [base, base + 20) available
1537 * as a range that we can look at. (Its actually the hash
1538 * size that is assured.) With our object header encoding
1539 * the maximum deflated object size is 2^137, which is just
1540 * insane, so we know won't exceed what we have been given.
1542 base
= use_pack(p
, w_curs
, *curpos
, &left
);
1543 used
= unpack_object_header_buffer(base
, left
, &type
, sizep
);
1552 int packed_object_info_detail(struct packed_git
*p
,
1554 unsigned long *size
,
1555 unsigned long *store_size
,
1556 unsigned int *delta_chain_length
,
1557 unsigned char *base_sha1
)
1559 struct pack_window
*w_curs
= NULL
;
1561 unsigned long dummy
;
1562 unsigned char *next_sha1
;
1563 enum object_type type
;
1564 struct revindex_entry
*revidx
;
1566 *delta_chain_length
= 0;
1567 curpos
= obj_offset
;
1568 type
= unpack_object_header(p
, &w_curs
, &curpos
, size
);
1570 revidx
= find_pack_revindex(p
, obj_offset
);
1571 *store_size
= revidx
[1].offset
- obj_offset
;
1576 die("pack %s contains unknown object type %d",
1577 p
->pack_name
, type
);
1582 unuse_pack(&w_curs
);
1585 obj_offset
= get_delta_base(p
, &w_curs
, &curpos
, type
, obj_offset
);
1587 die("pack %s contains bad delta base reference of type %s",
1588 p
->pack_name
, typename(type
));
1589 if (*delta_chain_length
== 0) {
1590 revidx
= find_pack_revindex(p
, obj_offset
);
1591 hashcpy(base_sha1
, nth_packed_object_sha1(p
, revidx
->nr
));
1595 next_sha1
= use_pack(p
, &w_curs
, curpos
, NULL
);
1596 if (*delta_chain_length
== 0)
1597 hashcpy(base_sha1
, next_sha1
);
1598 obj_offset
= find_pack_entry_one(next_sha1
, p
);
1601 (*delta_chain_length
)++;
1602 curpos
= obj_offset
;
1603 type
= unpack_object_header(p
, &w_curs
, &curpos
, &dummy
);
1607 static int packed_object_info(struct packed_git
*p
, off_t obj_offset
,
1608 unsigned long *sizep
, int *rtype
)
1610 struct pack_window
*w_curs
= NULL
;
1612 off_t curpos
= obj_offset
;
1613 enum object_type type
;
1615 type
= unpack_object_header(p
, &w_curs
, &curpos
, &size
);
1617 *rtype
= type
; /* representation type */
1622 type
= packed_delta_info(p
, &w_curs
, curpos
,
1623 type
, obj_offset
, sizep
);
1633 error("unknown object type %i at offset %"PRIuMAX
" in %s",
1634 type
, (uintmax_t)obj_offset
, p
->pack_name
);
1637 unuse_pack(&w_curs
);
1641 static void *unpack_compressed_entry(struct packed_git
*p
,
1642 struct pack_window
**w_curs
,
1648 unsigned char *buffer
, *in
;
1650 buffer
= xmallocz(size
);
1651 memset(&stream
, 0, sizeof(stream
));
1652 stream
.next_out
= buffer
;
1653 stream
.avail_out
= size
+ 1;
1655 git_inflate_init(&stream
);
1657 in
= use_pack(p
, w_curs
, curpos
, &stream
.avail_in
);
1658 stream
.next_in
= in
;
1659 st
= git_inflate(&stream
, Z_FINISH
);
1660 if (!stream
.avail_out
)
1661 break; /* the payload is larger than it should be */
1662 curpos
+= stream
.next_in
- in
;
1663 } while (st
== Z_OK
|| st
== Z_BUF_ERROR
);
1664 git_inflate_end(&stream
);
1665 if ((st
!= Z_STREAM_END
) || stream
.total_out
!= size
) {
1673 #define MAX_DELTA_CACHE (256)
1675 static size_t delta_base_cached
;
1677 static struct delta_base_cache_lru_list
{
1678 struct delta_base_cache_lru_list
*prev
;
1679 struct delta_base_cache_lru_list
*next
;
1680 } delta_base_cache_lru
= { &delta_base_cache_lru
, &delta_base_cache_lru
};
1682 static struct delta_base_cache_entry
{
1683 struct delta_base_cache_lru_list lru
;
1685 struct packed_git
*p
;
1688 enum object_type type
;
1689 } delta_base_cache
[MAX_DELTA_CACHE
];
1691 static unsigned long pack_entry_hash(struct packed_git
*p
, off_t base_offset
)
1695 hash
= (unsigned long)p
+ (unsigned long)base_offset
;
1696 hash
+= (hash
>> 8) + (hash
>> 16);
1697 return hash
% MAX_DELTA_CACHE
;
1700 static int in_delta_base_cache(struct packed_git
*p
, off_t base_offset
)
1702 unsigned long hash
= pack_entry_hash(p
, base_offset
);
1703 struct delta_base_cache_entry
*ent
= delta_base_cache
+ hash
;
1704 return (ent
->data
&& ent
->p
== p
&& ent
->base_offset
== base_offset
);
1707 static void *cache_or_unpack_entry(struct packed_git
*p
, off_t base_offset
,
1708 unsigned long *base_size
, enum object_type
*type
, int keep_cache
)
1711 unsigned long hash
= pack_entry_hash(p
, base_offset
);
1712 struct delta_base_cache_entry
*ent
= delta_base_cache
+ hash
;
1715 if (!ret
|| ent
->p
!= p
|| ent
->base_offset
!= base_offset
)
1716 return unpack_entry(p
, base_offset
, type
, base_size
);
1720 ent
->lru
.next
->prev
= ent
->lru
.prev
;
1721 ent
->lru
.prev
->next
= ent
->lru
.next
;
1722 delta_base_cached
-= ent
->size
;
1724 ret
= xmemdupz(ent
->data
, ent
->size
);
1727 *base_size
= ent
->size
;
1731 static inline void release_delta_base_cache(struct delta_base_cache_entry
*ent
)
1736 ent
->lru
.next
->prev
= ent
->lru
.prev
;
1737 ent
->lru
.prev
->next
= ent
->lru
.next
;
1738 delta_base_cached
-= ent
->size
;
1742 void clear_delta_base_cache(void)
1745 for (p
= 0; p
< MAX_DELTA_CACHE
; p
++)
1746 release_delta_base_cache(&delta_base_cache
[p
]);
1749 static void add_delta_base_cache(struct packed_git
*p
, off_t base_offset
,
1750 void *base
, unsigned long base_size
, enum object_type type
)
1752 unsigned long hash
= pack_entry_hash(p
, base_offset
);
1753 struct delta_base_cache_entry
*ent
= delta_base_cache
+ hash
;
1754 struct delta_base_cache_lru_list
*lru
;
1756 release_delta_base_cache(ent
);
1757 delta_base_cached
+= base_size
;
1759 for (lru
= delta_base_cache_lru
.next
;
1760 delta_base_cached
> delta_base_cache_limit
1761 && lru
!= &delta_base_cache_lru
;
1763 struct delta_base_cache_entry
*f
= (void *)lru
;
1764 if (f
->type
== OBJ_BLOB
)
1765 release_delta_base_cache(f
);
1767 for (lru
= delta_base_cache_lru
.next
;
1768 delta_base_cached
> delta_base_cache_limit
1769 && lru
!= &delta_base_cache_lru
;
1771 struct delta_base_cache_entry
*f
= (void *)lru
;
1772 release_delta_base_cache(f
);
1776 ent
->base_offset
= base_offset
;
1779 ent
->size
= base_size
;
1780 ent
->lru
.next
= &delta_base_cache_lru
;
1781 ent
->lru
.prev
= delta_base_cache_lru
.prev
;
1782 delta_base_cache_lru
.prev
->next
= &ent
->lru
;
1783 delta_base_cache_lru
.prev
= &ent
->lru
;
1786 static void *read_object(const unsigned char *sha1
, enum object_type
*type
,
1787 unsigned long *size
);
1789 static void *unpack_delta_entry(struct packed_git
*p
,
1790 struct pack_window
**w_curs
,
1792 unsigned long delta_size
,
1794 enum object_type
*type
,
1795 unsigned long *sizep
)
1797 void *delta_data
, *result
, *base
;
1798 unsigned long base_size
;
1801 base_offset
= get_delta_base(p
, w_curs
, &curpos
, *type
, obj_offset
);
1803 error("failed to validate delta base reference "
1804 "at offset %"PRIuMAX
" from %s",
1805 (uintmax_t)curpos
, p
->pack_name
);
1809 base
= cache_or_unpack_entry(p
, base_offset
, &base_size
, type
, 0);
1812 * We're probably in deep shit, but let's try to fetch
1813 * the required base anyway from another pack or loose.
1814 * This is costly but should happen only in the presence
1815 * of a corrupted pack, and is better than failing outright.
1817 struct revindex_entry
*revidx
;
1818 const unsigned char *base_sha1
;
1819 revidx
= find_pack_revindex(p
, base_offset
);
1822 base_sha1
= nth_packed_object_sha1(p
, revidx
->nr
);
1823 error("failed to read delta base object %s"
1824 " at offset %"PRIuMAX
" from %s",
1825 sha1_to_hex(base_sha1
), (uintmax_t)base_offset
,
1827 mark_bad_packed_object(p
, base_sha1
);
1828 base
= read_object(base_sha1
, type
, &base_size
);
1833 delta_data
= unpack_compressed_entry(p
, w_curs
, curpos
, delta_size
);
1835 error("failed to unpack compressed delta "
1836 "at offset %"PRIuMAX
" from %s",
1837 (uintmax_t)curpos
, p
->pack_name
);
1841 result
= patch_delta(base
, base_size
,
1842 delta_data
, delta_size
,
1845 die("failed to apply delta");
1847 add_delta_base_cache(p
, base_offset
, base
, base_size
, *type
);
1851 int do_check_packed_object_crc
;
1853 void *unpack_entry(struct packed_git
*p
, off_t obj_offset
,
1854 enum object_type
*type
, unsigned long *sizep
)
1856 struct pack_window
*w_curs
= NULL
;
1857 off_t curpos
= obj_offset
;
1860 if (do_check_packed_object_crc
&& p
->index_version
> 1) {
1861 struct revindex_entry
*revidx
= find_pack_revindex(p
, obj_offset
);
1862 unsigned long len
= revidx
[1].offset
- obj_offset
;
1863 if (check_pack_crc(p
, &w_curs
, obj_offset
, len
, revidx
->nr
)) {
1864 const unsigned char *sha1
=
1865 nth_packed_object_sha1(p
, revidx
->nr
);
1866 error("bad packed object CRC for %s",
1868 mark_bad_packed_object(p
, sha1
);
1869 unuse_pack(&w_curs
);
1874 *type
= unpack_object_header(p
, &w_curs
, &curpos
, sizep
);
1878 data
= unpack_delta_entry(p
, &w_curs
, curpos
, *sizep
,
1879 obj_offset
, type
, sizep
);
1885 data
= unpack_compressed_entry(p
, &w_curs
, curpos
, *sizep
);
1889 error("unknown object type %i at offset %"PRIuMAX
" in %s",
1890 *type
, (uintmax_t)obj_offset
, p
->pack_name
);
1892 unuse_pack(&w_curs
);
1896 const unsigned char *nth_packed_object_sha1(struct packed_git
*p
,
1899 const unsigned char *index
= p
->index_data
;
1901 if (open_pack_index(p
))
1903 index
= p
->index_data
;
1905 if (n
>= p
->num_objects
)
1908 if (p
->index_version
== 1) {
1909 return index
+ 24 * n
+ 4;
1912 return index
+ 20 * n
;
1916 off_t
nth_packed_object_offset(const struct packed_git
*p
, uint32_t n
)
1918 const unsigned char *index
= p
->index_data
;
1920 if (p
->index_version
== 1) {
1921 return ntohl(*((uint32_t *)(index
+ 24 * n
)));
1924 index
+= 8 + p
->num_objects
* (20 + 4);
1925 off
= ntohl(*((uint32_t *)(index
+ 4 * n
)));
1926 if (!(off
& 0x80000000))
1928 index
+= p
->num_objects
* 4 + (off
& 0x7fffffff) * 8;
1929 return (((uint64_t)ntohl(*((uint32_t *)(index
+ 0)))) << 32) |
1930 ntohl(*((uint32_t *)(index
+ 4)));
1934 off_t
find_pack_entry_one(const unsigned char *sha1
,
1935 struct packed_git
*p
)
1937 const uint32_t *level1_ofs
= p
->index_data
;
1938 const unsigned char *index
= p
->index_data
;
1939 unsigned hi
, lo
, stride
;
1940 static int use_lookup
= -1;
1941 static int debug_lookup
= -1;
1943 if (debug_lookup
< 0)
1944 debug_lookup
= !!getenv("GIT_DEBUG_LOOKUP");
1947 if (open_pack_index(p
))
1949 level1_ofs
= p
->index_data
;
1950 index
= p
->index_data
;
1952 if (p
->index_version
> 1) {
1957 hi
= ntohl(level1_ofs
[*sha1
]);
1958 lo
= ((*sha1
== 0x0) ? 0 : ntohl(level1_ofs
[*sha1
- 1]));
1959 if (p
->index_version
> 1) {
1967 printf("%02x%02x%02x... lo %u hi %u nr %"PRIu32
"\n",
1968 sha1
[0], sha1
[1], sha1
[2], lo
, hi
, p
->num_objects
);
1971 use_lookup
= !!getenv("GIT_USE_LOOKUP");
1973 int pos
= sha1_entry_pos(index
, stride
, 0,
1974 lo
, hi
, p
->num_objects
, sha1
);
1977 return nth_packed_object_offset(p
, pos
);
1981 unsigned mi
= (lo
+ hi
) / 2;
1982 int cmp
= hashcmp(index
+ mi
* stride
, sha1
);
1985 printf("lo %u hi %u rg %u mi %u\n",
1986 lo
, hi
, hi
- lo
, mi
);
1988 return nth_packed_object_offset(p
, mi
);
1997 static int is_pack_valid(struct packed_git
*p
)
1999 /* An already open pack is known to be valid. */
2000 if (p
->pack_fd
!= -1)
2003 /* If the pack has one window completely covering the
2004 * file size, the pack is known to be valid even if
2005 * the descriptor is not currently open.
2008 struct pack_window
*w
= p
->windows
;
2010 if (!w
->offset
&& w
->len
== p
->pack_size
)
2014 /* Force the pack to open to prove its valid. */
2015 return !open_packed_git(p
);
2018 static int find_pack_entry(const unsigned char *sha1
, struct pack_entry
*e
)
2020 static struct packed_git
*last_found
= (void *)1;
2021 struct packed_git
*p
;
2024 prepare_packed_git();
2027 p
= (last_found
== (void *)1) ? packed_git
: last_found
;
2030 if (p
->num_bad_objects
) {
2032 for (i
= 0; i
< p
->num_bad_objects
; i
++)
2033 if (!hashcmp(sha1
, p
->bad_object_sha1
+ 20 * i
))
2037 offset
= find_pack_entry_one(sha1
, p
);
2040 * We are about to tell the caller where they can
2041 * locate the requested object. We better make
2042 * sure the packfile is still here and can be
2043 * accessed before supplying that answer, as
2044 * it may have been deleted since the index
2047 if (!is_pack_valid(p
)) {
2048 error("packfile %s cannot be accessed", p
->pack_name
);
2053 hashcpy(e
->sha1
, sha1
);
2059 if (p
== last_found
)
2063 if (p
== last_found
)
2069 struct packed_git
*find_sha1_pack(const unsigned char *sha1
,
2070 struct packed_git
*packs
)
2072 struct packed_git
*p
;
2074 for (p
= packs
; p
; p
= p
->next
) {
2075 if (find_pack_entry_one(sha1
, p
))
2082 static int sha1_loose_object_info(const unsigned char *sha1
, unsigned long *sizep
)
2085 unsigned long mapsize
, size
;
2090 map
= map_sha1_file(sha1
, &mapsize
);
2092 return error("unable to find %s", sha1_to_hex(sha1
));
2093 if (unpack_sha1_header(&stream
, map
, mapsize
, hdr
, sizeof(hdr
)) < 0)
2094 status
= error("unable to unpack %s header",
2096 else if ((status
= parse_sha1_header(hdr
, &size
)) < 0)
2097 status
= error("unable to parse %s header", sha1_to_hex(sha1
));
2100 git_inflate_end(&stream
);
2101 munmap(map
, mapsize
);
2105 /* returns enum object_type or negative */
2106 int sha1_object_info_extended(const unsigned char *sha1
, struct object_info
*oi
)
2108 struct cached_object
*co
;
2109 struct pack_entry e
;
2112 co
= find_cached_object(sha1
);
2115 *(oi
->sizep
) = co
->size
;
2116 oi
->whence
= OI_CACHED
;
2120 if (!find_pack_entry(sha1
, &e
)) {
2121 /* Most likely it's a loose object. */
2122 status
= sha1_loose_object_info(sha1
, oi
->sizep
);
2124 oi
->whence
= OI_LOOSE
;
2128 /* Not a loose object; someone else may have just packed it. */
2129 reprepare_packed_git();
2130 if (!find_pack_entry(sha1
, &e
))
2134 status
= packed_object_info(e
.p
, e
.offset
, oi
->sizep
, &rtype
);
2136 mark_bad_packed_object(e
.p
, sha1
);
2137 status
= sha1_object_info_extended(sha1
, oi
);
2138 } else if (in_delta_base_cache(e
.p
, e
.offset
)) {
2139 oi
->whence
= OI_DBCACHED
;
2141 oi
->whence
= OI_PACKED
;
2142 oi
->u
.packed
.offset
= e
.offset
;
2143 oi
->u
.packed
.pack
= e
.p
;
2144 oi
->u
.packed
.is_delta
= (rtype
== OBJ_REF_DELTA
||
2145 rtype
== OBJ_OFS_DELTA
);
2151 int sha1_object_info(const unsigned char *sha1
, unsigned long *sizep
)
2153 struct object_info oi
;
2156 return sha1_object_info_extended(sha1
, &oi
);
2159 static void *read_packed_sha1(const unsigned char *sha1
,
2160 enum object_type
*type
, unsigned long *size
)
2162 struct pack_entry e
;
2165 if (!find_pack_entry(sha1
, &e
))
2167 data
= cache_or_unpack_entry(e
.p
, e
.offset
, size
, type
, 1);
2170 * We're probably in deep shit, but let's try to fetch
2171 * the required object anyway from another pack or loose.
2172 * This should happen only in the presence of a corrupted
2173 * pack, and is better than failing outright.
2175 error("failed to read object %s at offset %"PRIuMAX
" from %s",
2176 sha1_to_hex(sha1
), (uintmax_t)e
.offset
, e
.p
->pack_name
);
2177 mark_bad_packed_object(e
.p
, sha1
);
2178 data
= read_object(sha1
, type
, size
);
2183 int pretend_sha1_file(void *buf
, unsigned long len
, enum object_type type
,
2184 unsigned char *sha1
)
2186 struct cached_object
*co
;
2188 hash_sha1_file(buf
, len
, typename(type
), sha1
);
2189 if (has_sha1_file(sha1
) || find_cached_object(sha1
))
2191 if (cached_object_alloc
<= cached_object_nr
) {
2192 cached_object_alloc
= alloc_nr(cached_object_alloc
);
2193 cached_objects
= xrealloc(cached_objects
,
2194 sizeof(*cached_objects
) *
2195 cached_object_alloc
);
2197 co
= &cached_objects
[cached_object_nr
++];
2200 co
->buf
= xmalloc(len
);
2201 memcpy(co
->buf
, buf
, len
);
2202 hashcpy(co
->sha1
, sha1
);
2206 static void *read_object(const unsigned char *sha1
, enum object_type
*type
,
2207 unsigned long *size
)
2209 unsigned long mapsize
;
2211 struct cached_object
*co
;
2213 co
= find_cached_object(sha1
);
2217 return xmemdupz(co
->buf
, co
->size
);
2220 buf
= read_packed_sha1(sha1
, type
, size
);
2223 map
= map_sha1_file(sha1
, &mapsize
);
2225 buf
= unpack_sha1_file(map
, mapsize
, type
, size
, sha1
);
2226 munmap(map
, mapsize
);
2229 reprepare_packed_git();
2230 return read_packed_sha1(sha1
, type
, size
);
2234 * This function dies on corrupt objects; the callers who want to
2235 * deal with them should arrange to call read_object() and give error
2236 * messages themselves.
2238 void *read_sha1_file_extended(const unsigned char *sha1
,
2239 enum object_type
*type
,
2240 unsigned long *size
,
2245 const struct packed_git
*p
;
2246 const unsigned char *repl
= (flag
& READ_SHA1_FILE_REPLACE
)
2247 ? lookup_replace_object(sha1
) : sha1
;
2250 data
= read_object(repl
, type
, size
);
2254 if (errno
&& errno
!= ENOENT
)
2255 die_errno("failed to read object %s", sha1_to_hex(sha1
));
2257 /* die if we replaced an object with one that does not exist */
2259 die("replacement %s not found for %s",
2260 sha1_to_hex(repl
), sha1_to_hex(sha1
));
2262 if (has_loose_object(repl
)) {
2263 path
= sha1_file_name(sha1
);
2264 die("loose object %s (stored in %s) is corrupt",
2265 sha1_to_hex(repl
), path
);
2268 if ((p
= has_packed_and_bad(repl
)) != NULL
)
2269 die("packed object %s (stored in %s) is corrupt",
2270 sha1_to_hex(repl
), p
->pack_name
);
2275 void *read_object_with_reference(const unsigned char *sha1
,
2276 const char *required_type_name
,
2277 unsigned long *size
,
2278 unsigned char *actual_sha1_return
)
2280 enum object_type type
, required_type
;
2282 unsigned long isize
;
2283 unsigned char actual_sha1
[20];
2285 required_type
= type_from_string(required_type_name
);
2286 hashcpy(actual_sha1
, sha1
);
2288 int ref_length
= -1;
2289 const char *ref_type
= NULL
;
2291 buffer
= read_sha1_file(actual_sha1
, &type
, &isize
);
2294 if (type
== required_type
) {
2296 if (actual_sha1_return
)
2297 hashcpy(actual_sha1_return
, actual_sha1
);
2300 /* Handle references */
2301 else if (type
== OBJ_COMMIT
)
2303 else if (type
== OBJ_TAG
)
2304 ref_type
= "object ";
2309 ref_length
= strlen(ref_type
);
2311 if (ref_length
+ 40 > isize
||
2312 memcmp(buffer
, ref_type
, ref_length
) ||
2313 get_sha1_hex((char *) buffer
+ ref_length
, actual_sha1
)) {
2318 /* Now we have the ID of the referred-to object in
2319 * actual_sha1. Check again. */
2323 static void write_sha1_file_prepare(const void *buf
, unsigned long len
,
2324 const char *type
, unsigned char *sha1
,
2325 char *hdr
, int *hdrlen
)
2329 /* Generate the header */
2330 *hdrlen
= sprintf(hdr
, "%s %lu", type
, len
)+1;
2334 git_SHA1_Update(&c
, hdr
, *hdrlen
);
2335 git_SHA1_Update(&c
, buf
, len
);
2336 git_SHA1_Final(sha1
, &c
);
2340 * Move the just written object into its final resting place.
2341 * NEEDSWORK: this should be renamed to finalize_temp_file() as
2342 * "moving" is only a part of what it does, when no patch between
2343 * master to pu changes the call sites of this function.
2345 int move_temp_to_file(const char *tmpfile
, const char *filename
)
2349 if (object_creation_mode
== OBJECT_CREATION_USES_RENAMES
)
2351 else if (link(tmpfile
, filename
))
2355 * Coda hack - coda doesn't like cross-directory links,
2356 * so we fall back to a rename, which will mean that it
2357 * won't be able to check collisions, but that's not a
2360 * The same holds for FAT formatted media.
2362 * When this succeeds, we just return. We have nothing
2365 if (ret
&& ret
!= EEXIST
) {
2367 if (!rename(tmpfile
, filename
))
2371 unlink_or_warn(tmpfile
);
2373 if (ret
!= EEXIST
) {
2374 return error("unable to write sha1 filename %s: %s\n", filename
, strerror(ret
));
2376 /* FIXME!!! Collision check here ? */
2380 if (adjust_shared_perm(filename
))
2381 return error("unable to set permission to '%s'", filename
);
2385 static int write_buffer(int fd
, const void *buf
, size_t len
)
2387 if (write_in_full(fd
, buf
, len
) < 0)
2388 return error("file write error (%s)", strerror(errno
));
2392 int hash_sha1_file(const void *buf
, unsigned long len
, const char *type
,
2393 unsigned char *sha1
)
2397 write_sha1_file_prepare(buf
, len
, type
, sha1
, hdr
, &hdrlen
);
2401 /* Finalize a file on disk, and close it. */
2402 static void close_sha1_file(int fd
)
2404 if (fsync_object_files
)
2405 fsync_or_die(fd
, "sha1 file");
2407 die_errno("error when closing sha1 file");
2410 /* Size of directory component, including the ending '/' */
2411 static inline int directory_size(const char *filename
)
2413 const char *s
= strrchr(filename
, '/');
2416 return s
- filename
+ 1;
2420 * This creates a temporary file in the same directory as the final
2423 * We want to avoid cross-directory filename renames, because those
2424 * can have problems on various filesystems (FAT, NFS, Coda).
2426 static int create_tmpfile(char *buffer
, size_t bufsiz
, const char *filename
)
2428 int fd
, dirlen
= directory_size(filename
);
2430 if (dirlen
+ 20 > bufsiz
) {
2431 errno
= ENAMETOOLONG
;
2434 memcpy(buffer
, filename
, dirlen
);
2435 strcpy(buffer
+ dirlen
, "tmp_obj_XXXXXX");
2436 fd
= git_mkstemp_mode(buffer
, 0444);
2437 if (fd
< 0 && dirlen
&& errno
== ENOENT
) {
2438 /* Make sure the directory exists */
2439 memcpy(buffer
, filename
, dirlen
);
2440 buffer
[dirlen
-1] = 0;
2441 if (mkdir(buffer
, 0777) || adjust_shared_perm(buffer
))
2445 strcpy(buffer
+ dirlen
- 1, "/tmp_obj_XXXXXX");
2446 fd
= git_mkstemp_mode(buffer
, 0444);
2451 static int write_loose_object(const unsigned char *sha1
, char *hdr
, int hdrlen
,
2452 const void *buf
, unsigned long len
, time_t mtime
)
2455 unsigned char compressed
[4096];
2458 unsigned char parano_sha1
[20];
2460 static char tmpfile
[PATH_MAX
];
2462 filename
= sha1_file_name(sha1
);
2463 fd
= create_tmpfile(tmpfile
, sizeof(tmpfile
), filename
);
2465 if (errno
== EACCES
)
2466 return error("insufficient permission for adding an object to repository database %s\n", get_object_directory());
2468 return error("unable to create temporary sha1 filename %s: %s\n", tmpfile
, strerror(errno
));
2472 memset(&stream
, 0, sizeof(stream
));
2473 deflateInit(&stream
, zlib_compression_level
);
2474 stream
.next_out
= compressed
;
2475 stream
.avail_out
= sizeof(compressed
);
2478 /* First header.. */
2479 stream
.next_in
= (unsigned char *)hdr
;
2480 stream
.avail_in
= hdrlen
;
2481 while (deflate(&stream
, 0) == Z_OK
)
2483 git_SHA1_Update(&c
, hdr
, hdrlen
);
2485 /* Then the data itself.. */
2486 stream
.next_in
= (void *)buf
;
2487 stream
.avail_in
= len
;
2489 unsigned char *in0
= stream
.next_in
;
2490 ret
= deflate(&stream
, Z_FINISH
);
2491 git_SHA1_Update(&c
, in0
, stream
.next_in
- in0
);
2492 if (write_buffer(fd
, compressed
, stream
.next_out
- compressed
) < 0)
2493 die("unable to write sha1 file");
2494 stream
.next_out
= compressed
;
2495 stream
.avail_out
= sizeof(compressed
);
2496 } while (ret
== Z_OK
);
2498 if (ret
!= Z_STREAM_END
)
2499 die("unable to deflate new object %s (%d)", sha1_to_hex(sha1
), ret
);
2500 ret
= deflateEnd(&stream
);
2502 die("deflateEnd on object %s failed (%d)", sha1_to_hex(sha1
), ret
);
2503 git_SHA1_Final(parano_sha1
, &c
);
2504 if (hashcmp(sha1
, parano_sha1
) != 0)
2505 die("confused by unstable object source data for %s", sha1_to_hex(sha1
));
2507 close_sha1_file(fd
);
2512 utb
.modtime
= mtime
;
2513 if (utime(tmpfile
, &utb
) < 0)
2514 warning("failed utime() on %s: %s",
2515 tmpfile
, strerror(errno
));
2518 return move_temp_to_file(tmpfile
, filename
);
2521 int write_sha1_file(const void *buf
, unsigned long len
, const char *type
, unsigned char *returnsha1
)
2523 unsigned char sha1
[20];
2527 /* Normally if we have it in the pack then we do not bother writing
2528 * it out into .git/objects/??/?{38} file.
2530 write_sha1_file_prepare(buf
, len
, type
, sha1
, hdr
, &hdrlen
);
2532 hashcpy(returnsha1
, sha1
);
2533 if (has_sha1_file(sha1
))
2535 return write_loose_object(sha1
, hdr
, hdrlen
, buf
, len
, 0);
2538 int force_object_loose(const unsigned char *sha1
, time_t mtime
)
2542 enum object_type type
;
2547 if (has_loose_object(sha1
))
2549 buf
= read_packed_sha1(sha1
, &type
, &len
);
2551 return error("cannot read sha1_file for %s", sha1_to_hex(sha1
));
2552 hdrlen
= sprintf(hdr
, "%s %lu", typename(type
), len
) + 1;
2553 ret
= write_loose_object(sha1
, hdr
, hdrlen
, buf
, len
, mtime
);
2559 int has_pack_index(const unsigned char *sha1
)
2562 if (stat(sha1_pack_index_name(sha1
), &st
))
2567 int has_sha1_pack(const unsigned char *sha1
)
2569 struct pack_entry e
;
2570 return find_pack_entry(sha1
, &e
);
2573 int has_sha1_file(const unsigned char *sha1
)
2575 struct pack_entry e
;
2577 if (find_pack_entry(sha1
, &e
))
2579 return has_loose_object(sha1
);
2582 static void check_tree(const void *buf
, size_t size
)
2584 struct tree_desc desc
;
2585 struct name_entry entry
;
2587 init_tree_desc(&desc
, buf
, size
);
2588 while (tree_entry(&desc
, &entry
))
2590 * tree_entry() will die() on malformed entries */
2594 static void check_commit(const void *buf
, size_t size
)
2597 memset(&c
, 0, sizeof(c
));
2598 if (parse_commit_buffer(&c
, buf
, size
))
2599 die("corrupt commit");
2602 static void check_tag(const void *buf
, size_t size
)
2605 memset(&t
, 0, sizeof(t
));
2606 if (parse_tag_buffer(&t
, buf
, size
))
2610 static int index_mem(unsigned char *sha1
, void *buf
, size_t size
,
2611 enum object_type type
,
2612 const char *path
, unsigned flags
)
2614 int ret
, re_allocated
= 0;
2615 int write_object
= flags
& HASH_WRITE_OBJECT
;
2621 * Convert blobs to git internal format
2623 if ((type
== OBJ_BLOB
) && path
) {
2624 struct strbuf nbuf
= STRBUF_INIT
;
2625 if (convert_to_git(path
, buf
, size
, &nbuf
,
2626 write_object
? safe_crlf
: 0)) {
2627 buf
= strbuf_detach(&nbuf
, &size
);
2631 if (flags
& HASH_FORMAT_CHECK
) {
2632 if (type
== OBJ_TREE
)
2633 check_tree(buf
, size
);
2634 if (type
== OBJ_COMMIT
)
2635 check_commit(buf
, size
);
2636 if (type
== OBJ_TAG
)
2637 check_tag(buf
, size
);
2641 ret
= write_sha1_file(buf
, size
, typename(type
), sha1
);
2643 ret
= hash_sha1_file(buf
, size
, typename(type
), sha1
);
2649 static int index_pipe(unsigned char *sha1
, int fd
, enum object_type type
,
2650 const char *path
, unsigned flags
)
2652 struct strbuf sbuf
= STRBUF_INIT
;
2655 if (strbuf_read(&sbuf
, fd
, 4096) >= 0)
2656 ret
= index_mem(sha1
, sbuf
.buf
, sbuf
.len
, type
, path
, flags
);
2659 strbuf_release(&sbuf
);
2663 #define SMALL_FILE_SIZE (32*1024)
2665 static int index_core(unsigned char *sha1
, int fd
, size_t size
,
2666 enum object_type type
, const char *path
,
2672 ret
= index_mem(sha1
, NULL
, size
, type
, path
, flags
);
2673 } else if (size
<= SMALL_FILE_SIZE
) {
2674 char *buf
= xmalloc(size
);
2675 if (size
== read_in_full(fd
, buf
, size
))
2676 ret
= index_mem(sha1
, buf
, size
, type
, path
, flags
);
2678 ret
= error("short read %s", strerror(errno
));
2681 void *buf
= xmmap(NULL
, size
, PROT_READ
, MAP_PRIVATE
, fd
, 0);
2682 ret
= index_mem(sha1
, buf
, size
, type
, path
, flags
);
2689 * This creates one packfile per large blob, because the caller
2690 * immediately wants the result sha1, and fast-import can report the
2691 * object name via marks mechanism only by closing the created
2694 * This also bypasses the usual "convert-to-git" dance, and that is on
2695 * purpose. We could write a streaming version of the converting
2696 * functions and insert that before feeding the data to fast-import
2697 * (or equivalent in-core API described above), but the primary
2698 * motivation for trying to stream from the working tree file and to
2699 * avoid mmaping it in core is to deal with large binary blobs, and
2700 * by definition they do _not_ want to get any conversion.
2702 static int index_stream(unsigned char *sha1
, int fd
, size_t size
,
2703 enum object_type type
, const char *path
,
2706 struct child_process fast_import
;
2707 char export_marks
[512];
2708 const char *argv
[] = { "fast-import", "--quiet", export_marks
, NULL
};
2710 char fast_import_cmd
[512];
2714 strcpy(tmpfile
, git_path("hashstream_XXXXXX"));
2715 tmpfd
= git_mkstemp_mode(tmpfile
, 0600);
2717 die_errno("cannot create tempfile: %s", tmpfile
);
2719 die_errno("cannot close tempfile: %s", tmpfile
);
2720 sprintf(export_marks
, "--export-marks=%s", tmpfile
);
2722 memset(&fast_import
, 0, sizeof(fast_import
));
2723 fast_import
.in
= -1;
2724 fast_import
.argv
= argv
;
2725 fast_import
.git_cmd
= 1;
2726 if (start_command(&fast_import
))
2727 die_errno("index-stream: git fast-import failed");
2729 len
= sprintf(fast_import_cmd
, "blob\nmark :1\ndata %lu\n",
2730 (unsigned long) size
);
2731 write_or_whine(fast_import
.in
, fast_import_cmd
, len
,
2732 "index-stream: feeding fast-import");
2735 size_t sz
= size
< sizeof(buf
) ? size
: sizeof(buf
);
2738 actual
= read_in_full(fd
, buf
, sz
);
2740 die_errno("index-stream: reading input");
2741 if (write_in_full(fast_import
.in
, buf
, actual
) != actual
)
2742 die_errno("index-stream: feeding fast-import");
2745 if (close(fast_import
.in
))
2746 die_errno("index-stream: closing fast-import");
2747 if (finish_command(&fast_import
))
2748 die_errno("index-stream: finishing fast-import");
2750 tmpfd
= open(tmpfile
, O_RDONLY
);
2752 die_errno("index-stream: cannot open fast-import mark");
2753 len
= read(tmpfd
, buf
, sizeof(buf
));
2755 die_errno("index-stream: reading fast-import mark");
2756 if (close(tmpfd
) < 0)
2757 die_errno("index-stream: closing fast-import mark");
2758 if (unlink(tmpfile
))
2759 die_errno("index-stream: unlinking fast-import mark");
2761 memcmp(":1 ", buf
, 3) ||
2762 get_sha1_hex(buf
+ 3, sha1
))
2763 die_errno("index-stream: unexpected fast-import mark: <%s>", buf
);
2767 int index_fd(unsigned char *sha1
, int fd
, struct stat
*st
,
2768 enum object_type type
, const char *path
, unsigned flags
)
2771 size_t size
= xsize_t(st
->st_size
);
2773 if (!S_ISREG(st
->st_mode
))
2774 ret
= index_pipe(sha1
, fd
, type
, path
, flags
);
2775 else if (size
<= big_file_threshold
|| type
!= OBJ_BLOB
)
2776 ret
= index_core(sha1
, fd
, size
, type
, path
, flags
);
2778 ret
= index_stream(sha1
, fd
, size
, type
, path
, flags
);
2783 int index_path(unsigned char *sha1
, const char *path
, struct stat
*st
, unsigned flags
)
2786 struct strbuf sb
= STRBUF_INIT
;
2788 switch (st
->st_mode
& S_IFMT
) {
2790 fd
= open(path
, O_RDONLY
);
2792 return error("open(\"%s\"): %s", path
,
2794 if (index_fd(sha1
, fd
, st
, OBJ_BLOB
, path
, flags
) < 0)
2795 return error("%s: failed to insert into database",
2799 if (strbuf_readlink(&sb
, path
, st
->st_size
)) {
2800 char *errstr
= strerror(errno
);
2801 return error("readlink(\"%s\"): %s", path
,
2804 if (!(flags
& HASH_WRITE_OBJECT
))
2805 hash_sha1_file(sb
.buf
, sb
.len
, blob_type
, sha1
);
2806 else if (write_sha1_file(sb
.buf
, sb
.len
, blob_type
, sha1
))
2807 return error("%s: failed to insert into database",
2809 strbuf_release(&sb
);
2812 return resolve_gitlink_ref(path
, "HEAD", sha1
);
2814 return error("%s: unsupported file type", path
);
2819 int read_pack_header(int fd
, struct pack_header
*header
)
2821 if (read_in_full(fd
, header
, sizeof(*header
)) < sizeof(*header
))
2822 /* "eof before pack header was fully read" */
2823 return PH_ERROR_EOF
;
2825 if (header
->hdr_signature
!= htonl(PACK_SIGNATURE
))
2826 /* "protocol error (pack signature mismatch detected)" */
2827 return PH_ERROR_PACK_SIGNATURE
;
2828 if (!pack_version_ok(header
->hdr_version
))
2829 /* "protocol error (pack version unsupported)" */
2830 return PH_ERROR_PROTOCOL
;
2834 void assert_sha1_type(const unsigned char *sha1
, enum object_type expect
)
2836 enum object_type type
= sha1_object_info(sha1
, NULL
);
2838 die("%s is not a valid object", sha1_to_hex(sha1
));
2840 die("%s is not a valid '%s' object", sha1_to_hex(sha1
),