2 * GIT - The information manager from hell
4 * Copyright (C) Linus Torvalds, 2005
6 * This handles basic git sha1 object files - packing, unpacking,
17 #include "pack-revindex.h"
20 #if defined(__linux__) && (defined(__i386__) || defined(__PPC__))
21 #define O_NOATIME 01000000
29 static unsigned long sz_fmt(size_t s
) { return (unsigned long)s
; }
32 static size_t sz_fmt(size_t s
) { return s
; }
35 const unsigned char null_sha1
[20];
37 static unsigned int sha1_file_open_flag
= O_NOATIME
;
39 const signed char hexval_table
[256] = {
40 -1, -1, -1, -1, -1, -1, -1, -1, /* 00-07 */
41 -1, -1, -1, -1, -1, -1, -1, -1, /* 08-0f */
42 -1, -1, -1, -1, -1, -1, -1, -1, /* 10-17 */
43 -1, -1, -1, -1, -1, -1, -1, -1, /* 18-1f */
44 -1, -1, -1, -1, -1, -1, -1, -1, /* 20-27 */
45 -1, -1, -1, -1, -1, -1, -1, -1, /* 28-2f */
46 0, 1, 2, 3, 4, 5, 6, 7, /* 30-37 */
47 8, 9, -1, -1, -1, -1, -1, -1, /* 38-3f */
48 -1, 10, 11, 12, 13, 14, 15, -1, /* 40-47 */
49 -1, -1, -1, -1, -1, -1, -1, -1, /* 48-4f */
50 -1, -1, -1, -1, -1, -1, -1, -1, /* 50-57 */
51 -1, -1, -1, -1, -1, -1, -1, -1, /* 58-5f */
52 -1, 10, 11, 12, 13, 14, 15, -1, /* 60-67 */
53 -1, -1, -1, -1, -1, -1, -1, -1, /* 68-67 */
54 -1, -1, -1, -1, -1, -1, -1, -1, /* 70-77 */
55 -1, -1, -1, -1, -1, -1, -1, -1, /* 78-7f */
56 -1, -1, -1, -1, -1, -1, -1, -1, /* 80-87 */
57 -1, -1, -1, -1, -1, -1, -1, -1, /* 88-8f */
58 -1, -1, -1, -1, -1, -1, -1, -1, /* 90-97 */
59 -1, -1, -1, -1, -1, -1, -1, -1, /* 98-9f */
60 -1, -1, -1, -1, -1, -1, -1, -1, /* a0-a7 */
61 -1, -1, -1, -1, -1, -1, -1, -1, /* a8-af */
62 -1, -1, -1, -1, -1, -1, -1, -1, /* b0-b7 */
63 -1, -1, -1, -1, -1, -1, -1, -1, /* b8-bf */
64 -1, -1, -1, -1, -1, -1, -1, -1, /* c0-c7 */
65 -1, -1, -1, -1, -1, -1, -1, -1, /* c8-cf */
66 -1, -1, -1, -1, -1, -1, -1, -1, /* d0-d7 */
67 -1, -1, -1, -1, -1, -1, -1, -1, /* d8-df */
68 -1, -1, -1, -1, -1, -1, -1, -1, /* e0-e7 */
69 -1, -1, -1, -1, -1, -1, -1, -1, /* e8-ef */
70 -1, -1, -1, -1, -1, -1, -1, -1, /* f0-f7 */
71 -1, -1, -1, -1, -1, -1, -1, -1, /* f8-ff */
74 int get_sha1_hex(const char *hex
, unsigned char *sha1
)
77 for (i
= 0; i
< 20; i
++) {
78 unsigned int val
= (hexval(hex
[0]) << 4) | hexval(hex
[1]);
87 static inline int offset_1st_component(const char *path
)
89 if (has_dos_drive_prefix(path
))
90 return 2 + (path
[2] == '/');
94 int safe_create_leading_directories(char *path
)
96 char *pos
= path
+ offset_1st_component(path
);
100 pos
= strchr(pos
, '/');
104 if (!stat(path
, &st
)) {
106 if (!S_ISDIR(st
.st_mode
)) {
111 else if (mkdir(path
, 0777)) {
115 else if (adjust_shared_perm(path
)) {
124 char * sha1_to_hex(const unsigned char *sha1
)
127 static char hexbuffer
[4][50];
128 static const char hex
[] = "0123456789abcdef";
129 char *buffer
= hexbuffer
[3 & ++bufno
], *buf
= buffer
;
132 for (i
= 0; i
< 20; i
++) {
133 unsigned int val
= *sha1
++;
134 *buf
++ = hex
[val
>> 4];
135 *buf
++ = hex
[val
& 0xf];
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 *name
, *base
;
169 const char *sha1_file_directory
= get_object_directory();
170 int len
= strlen(sha1_file_directory
);
171 base
= xmalloc(len
+ 60);
172 memcpy(base
, sha1_file_directory
, len
);
173 memset(base
+len
, 0, 60);
176 name
= base
+ len
+ 1;
178 fill_sha1_path(name
, sha1
);
182 char *sha1_pack_name(const unsigned char *sha1
)
184 static const char hex
[] = "0123456789abcdef";
185 static char *name
, *base
, *buf
;
189 const char *sha1_file_directory
= get_object_directory();
190 int len
= strlen(sha1_file_directory
);
191 base
= xmalloc(len
+ 60);
192 sprintf(base
, "%s/pack/pack-1234567890123456789012345678901234567890.pack", sha1_file_directory
);
193 name
= base
+ len
+ 11;
198 for (i
= 0; i
< 20; i
++) {
199 unsigned int val
= *sha1
++;
200 *buf
++ = hex
[val
>> 4];
201 *buf
++ = hex
[val
& 0xf];
207 char *sha1_pack_index_name(const unsigned char *sha1
)
209 static const char hex
[] = "0123456789abcdef";
210 static char *name
, *base
, *buf
;
214 const char *sha1_file_directory
= get_object_directory();
215 int len
= strlen(sha1_file_directory
);
216 base
= xmalloc(len
+ 60);
217 sprintf(base
, "%s/pack/pack-1234567890123456789012345678901234567890.idx", sha1_file_directory
);
218 name
= base
+ len
+ 11;
223 for (i
= 0; i
< 20; i
++) {
224 unsigned int val
= *sha1
++;
225 *buf
++ = hex
[val
>> 4];
226 *buf
++ = hex
[val
& 0xf];
232 struct alternate_object_database
*alt_odb_list
;
233 static struct alternate_object_database
**alt_odb_tail
;
235 static void read_info_alternates(const char * alternates
, int depth
);
238 * Prepare alternate object database registry.
240 * The variable alt_odb_list points at the list of struct
241 * alternate_object_database. The elements on this list come from
242 * non-empty elements from colon separated ALTERNATE_DB_ENVIRONMENT
243 * environment variable, and $GIT_OBJECT_DIRECTORY/info/alternates,
244 * whose contents is similar to that environment variable but can be
245 * LF separated. Its base points at a statically allocated buffer that
246 * contains "/the/directory/corresponding/to/.git/objects/...", while
247 * its name points just after the slash at the end of ".git/objects/"
248 * in the example above, and has enough space to hold 40-byte hex
249 * SHA1, an extra slash for the first level indirection, and the
252 static int link_alt_odb_entry(const char * entry
, int len
, const char * relative_base
, int depth
)
255 const char *objdir
= get_object_directory();
256 struct alternate_object_database
*ent
;
257 struct alternate_object_database
*alt
;
258 /* 43 = 40-byte + 2 '/' + terminating NUL */
260 int entlen
= pfxlen
+ 43;
263 if (!is_absolute_path(entry
) && relative_base
) {
264 /* Relative alt-odb */
266 base_len
= strlen(relative_base
) + 1;
270 ent
= xmalloc(sizeof(*ent
) + entlen
);
272 if (!is_absolute_path(entry
) && relative_base
) {
273 memcpy(ent
->base
, relative_base
, base_len
- 1);
274 ent
->base
[base_len
- 1] = '/';
275 memcpy(ent
->base
+ base_len
, entry
, len
);
278 memcpy(ent
->base
, entry
, pfxlen
);
280 ent
->name
= ent
->base
+ pfxlen
+ 1;
281 ent
->base
[pfxlen
+ 3] = '/';
282 ent
->base
[pfxlen
] = ent
->base
[entlen
-1] = 0;
284 /* Detect cases where alternate disappeared */
285 if (stat(ent
->base
, &st
) || !S_ISDIR(st
.st_mode
)) {
286 error("object directory %s does not exist; "
287 "check .git/objects/info/alternates.",
293 /* Prevent the common mistake of listing the same
294 * thing twice, or object directory itself.
296 for (alt
= alt_odb_list
; alt
; alt
= alt
->next
) {
297 if (!memcmp(ent
->base
, alt
->base
, pfxlen
)) {
302 if (!memcmp(ent
->base
, objdir
, pfxlen
)) {
307 /* add the alternate entry */
309 alt_odb_tail
= &(ent
->next
);
312 /* recursively add alternates */
313 read_info_alternates(ent
->base
, depth
+ 1);
315 ent
->base
[pfxlen
] = '/';
320 static void link_alt_odb_entries(const char *alt
, const char *ep
, int sep
,
321 const char *relative_base
, int depth
)
323 const char *cp
, *last
;
326 error("%s: ignoring alternate object stores, nesting too deep.",
334 if (cp
< ep
&& *cp
== '#') {
335 while (cp
< ep
&& *cp
!= sep
)
340 while (cp
< ep
&& *cp
!= sep
)
343 if (!is_absolute_path(last
) && depth
) {
344 error("%s: ignoring relative alternate object store %s",
345 relative_base
, last
);
347 link_alt_odb_entry(last
, cp
- last
,
348 relative_base
, depth
);
351 while (cp
< ep
&& *cp
== sep
)
357 static void read_info_alternates(const char * relative_base
, int depth
)
362 const char alt_file_name
[] = "info/alternates";
363 /* Given that relative_base is no longer than PATH_MAX,
364 ensure that "path" has enough space to append "/", the
365 file name, "info/alternates", and a trailing NUL. */
366 char path
[PATH_MAX
+ 1 + sizeof alt_file_name
];
369 sprintf(path
, "%s/%s", relative_base
, alt_file_name
);
370 fd
= open(path
, O_RDONLY
);
373 if (fstat(fd
, &st
) || (st
.st_size
== 0)) {
377 mapsz
= xsize_t(st
.st_size
);
378 map
= xmmap(NULL
, mapsz
, PROT_READ
, MAP_PRIVATE
, fd
, 0);
381 link_alt_odb_entries(map
, map
+ mapsz
, '\n', relative_base
, depth
);
386 void prepare_alt_odb(void)
393 alt
= getenv(ALTERNATE_DB_ENVIRONMENT
);
396 alt_odb_tail
= &alt_odb_list
;
398 link_alt_odb_entries(alt
, alt
+ strlen(alt
), ';', NULL
, 0);
400 link_alt_odb_entries(alt
, alt
+ strlen(alt
), ':', NULL
, 0);
403 read_info_alternates(get_object_directory(), 0);
406 static char *find_sha1_file(const unsigned char *sha1
, struct stat
*st
)
408 char *name
= sha1_file_name(sha1
);
409 struct alternate_object_database
*alt
;
414 for (alt
= alt_odb_list
; alt
; alt
= alt
->next
) {
416 fill_sha1_path(name
, sha1
);
417 if (!stat(alt
->base
, st
))
423 static unsigned int pack_used_ctr
;
424 static unsigned int pack_mmap_calls
;
425 static unsigned int peak_pack_open_windows
;
426 static unsigned int pack_open_windows
;
427 static size_t peak_pack_mapped
;
428 static size_t pack_mapped
;
429 struct packed_git
*packed_git
;
431 void pack_report(void)
434 "pack_report: getpagesize() = %10" SZ_FMT
"\n"
435 "pack_report: core.packedGitWindowSize = %10" SZ_FMT
"\n"
436 "pack_report: core.packedGitLimit = %10" SZ_FMT
"\n",
437 sz_fmt(getpagesize()),
438 sz_fmt(packed_git_window_size
),
439 sz_fmt(packed_git_limit
));
441 "pack_report: pack_used_ctr = %10u\n"
442 "pack_report: pack_mmap_calls = %10u\n"
443 "pack_report: pack_open_windows = %10u / %10u\n"
444 "pack_report: pack_mapped = "
445 "%10" SZ_FMT
" / %10" SZ_FMT
"\n",
448 pack_open_windows
, peak_pack_open_windows
,
449 sz_fmt(pack_mapped
), sz_fmt(peak_pack_mapped
));
452 static int check_packed_git_idx(const char *path
, struct packed_git
*p
)
455 struct pack_idx_header
*hdr
;
457 uint32_t version
, nr
, i
, *index
;
458 int fd
= open(path
, O_RDONLY
);
463 if (fstat(fd
, &st
)) {
467 idx_size
= xsize_t(st
.st_size
);
468 if (idx_size
< 4 * 256 + 20 + 20) {
470 return error("index file %s is too small", path
);
472 idx_map
= xmmap(NULL
, idx_size
, PROT_READ
, MAP_PRIVATE
, fd
, 0);
476 if (hdr
->idx_signature
== htonl(PACK_IDX_SIGNATURE
)) {
477 version
= ntohl(hdr
->idx_version
);
478 if (version
< 2 || version
> 2) {
479 munmap(idx_map
, idx_size
);
480 return error("index file %s is version %d"
481 " and is not supported by this binary"
482 " (try upgrading GIT to a newer version)",
491 index
+= 2; /* skip index header */
492 for (i
= 0; i
< 256; i
++) {
493 uint32_t n
= ntohl(index
[i
]);
495 munmap(idx_map
, idx_size
);
496 return error("non-monotonic index %s", path
);
504 * - 256 index entries 4 bytes each
505 * - 24-byte entries * nr (20-byte sha1 + 4-byte offset)
506 * - 20-byte SHA1 of the packfile
507 * - 20-byte SHA1 file checksum
509 if (idx_size
!= 4*256 + nr
* 24 + 20 + 20) {
510 munmap(idx_map
, idx_size
);
511 return error("wrong index v1 file size in %s", path
);
513 } else if (version
== 2) {
516 * - 8 bytes of header
517 * - 256 index entries 4 bytes each
518 * - 20-byte sha1 entry * nr
519 * - 4-byte crc entry * nr
520 * - 4-byte offset entry * nr
521 * - 20-byte SHA1 of the packfile
522 * - 20-byte SHA1 file checksum
523 * And after the 4-byte offset table might be a
524 * variable sized table containing 8-byte entries
525 * for offsets larger than 2^31.
527 unsigned long min_size
= 8 + 4*256 + nr
*(20 + 4 + 4) + 20 + 20;
528 unsigned long max_size
= min_size
;
530 max_size
+= (nr
- 1)*8;
531 if (idx_size
< min_size
|| idx_size
> max_size
) {
532 munmap(idx_map
, idx_size
);
533 return error("wrong index v2 file size in %s", path
);
535 if (idx_size
!= min_size
&&
537 * make sure we can deal with large pack offsets.
538 * 31-bit signed offset won't be enough, neither
539 * 32-bit unsigned one will be.
541 (sizeof(off_t
) <= 4)) {
542 munmap(idx_map
, idx_size
);
543 return error("pack too large for current definition of off_t in %s", path
);
547 p
->index_version
= version
;
548 p
->index_data
= idx_map
;
549 p
->index_size
= idx_size
;
554 int open_pack_index(struct packed_git
*p
)
562 idx_name
= xstrdup(p
->pack_name
);
563 strcpy(idx_name
+ strlen(idx_name
) - strlen(".pack"), ".idx");
564 ret
= check_packed_git_idx(idx_name
, p
);
569 static void scan_windows(struct packed_git
*p
,
570 struct packed_git
**lru_p
,
571 struct pack_window
**lru_w
,
572 struct pack_window
**lru_l
)
574 struct pack_window
*w
, *w_l
;
576 for (w_l
= NULL
, w
= p
->windows
; w
; w
= w
->next
) {
578 if (!*lru_w
|| w
->last_used
< (*lru_w
)->last_used
) {
588 static int unuse_one_window(struct packed_git
*current
, int keep_fd
)
590 struct packed_git
*p
, *lru_p
= NULL
;
591 struct pack_window
*lru_w
= NULL
, *lru_l
= NULL
;
594 scan_windows(current
, &lru_p
, &lru_w
, &lru_l
);
595 for (p
= packed_git
; p
; p
= p
->next
)
596 scan_windows(p
, &lru_p
, &lru_w
, &lru_l
);
598 munmap(lru_w
->base
, lru_w
->len
);
599 pack_mapped
-= lru_w
->len
;
601 lru_l
->next
= lru_w
->next
;
603 lru_p
->windows
= lru_w
->next
;
604 if (!lru_p
->windows
&& lru_p
->pack_fd
!= keep_fd
) {
605 close(lru_p
->pack_fd
);
616 void release_pack_memory(size_t need
, int fd
)
618 size_t cur
= pack_mapped
;
619 while (need
>= (cur
- pack_mapped
) && unuse_one_window(NULL
, fd
))
623 void close_pack_windows(struct packed_git
*p
)
626 struct pack_window
*w
= p
->windows
;
629 die("pack '%s' still has open windows to it",
631 munmap(w
->base
, w
->len
);
632 pack_mapped
-= w
->len
;
634 p
->windows
= w
->next
;
639 void unuse_pack(struct pack_window
**w_cursor
)
641 struct pack_window
*w
= *w_cursor
;
649 * Do not call this directly as this leaks p->pack_fd on error return;
650 * call open_packed_git() instead.
652 static int open_packed_git_1(struct packed_git
*p
)
655 struct pack_header hdr
;
656 unsigned char sha1
[20];
657 unsigned char *idx_sha1
;
660 if (!p
->index_data
&& open_pack_index(p
))
661 return error("packfile %s index unavailable", p
->pack_name
);
663 p
->pack_fd
= open(p
->pack_name
, O_RDONLY
);
664 if (p
->pack_fd
< 0 || fstat(p
->pack_fd
, &st
))
667 /* If we created the struct before we had the pack we lack size. */
669 if (!S_ISREG(st
.st_mode
))
670 return error("packfile %s not a regular file", p
->pack_name
);
671 p
->pack_size
= st
.st_size
;
672 } else if (p
->pack_size
!= st
.st_size
)
673 return error("packfile %s size changed", p
->pack_name
);
675 /* We leave these file descriptors open with sliding mmap;
676 * there is no point keeping them open across exec(), though.
678 fd_flag
= fcntl(p
->pack_fd
, F_GETFD
, 0);
680 return error("cannot determine file descriptor flags");
681 fd_flag
|= FD_CLOEXEC
;
682 if (fcntl(p
->pack_fd
, F_SETFD
, fd_flag
) == -1)
683 return error("cannot set FD_CLOEXEC");
685 /* Verify we recognize this pack file format. */
686 if (read_in_full(p
->pack_fd
, &hdr
, sizeof(hdr
)) != sizeof(hdr
))
687 return error("file %s is far too short to be a packfile", p
->pack_name
);
688 if (hdr
.hdr_signature
!= htonl(PACK_SIGNATURE
))
689 return error("file %s is not a GIT packfile", p
->pack_name
);
690 if (!pack_version_ok(hdr
.hdr_version
))
691 return error("packfile %s is version %u and not supported"
692 " (try upgrading GIT to a newer version)",
693 p
->pack_name
, ntohl(hdr
.hdr_version
));
695 /* Verify the pack matches its index. */
696 if (p
->num_objects
!= ntohl(hdr
.hdr_entries
))
697 return error("packfile %s claims to have %u objects"
698 " while index indicates %u objects",
699 p
->pack_name
, ntohl(hdr
.hdr_entries
),
701 if (lseek(p
->pack_fd
, p
->pack_size
- sizeof(sha1
), SEEK_SET
) == -1)
702 return error("end of packfile %s is unavailable", p
->pack_name
);
703 if (read_in_full(p
->pack_fd
, sha1
, sizeof(sha1
)) != sizeof(sha1
))
704 return error("packfile %s signature is unavailable", p
->pack_name
);
705 idx_sha1
= ((unsigned char *)p
->index_data
) + p
->index_size
- 40;
706 if (hashcmp(sha1
, idx_sha1
))
707 return error("packfile %s does not match index", p
->pack_name
);
711 static int open_packed_git(struct packed_git
*p
)
713 if (!open_packed_git_1(p
))
715 if (p
->pack_fd
!= -1) {
722 static int in_window(struct pack_window
*win
, off_t offset
)
724 /* We must promise at least 20 bytes (one hash) after the
725 * offset is available from this window, otherwise the offset
726 * is not actually in this window and a different window (which
727 * has that one hash excess) must be used. This is to support
728 * the object header and delta base parsing routines below.
730 off_t win_off
= win
->offset
;
731 return win_off
<= offset
732 && (offset
+ 20) <= (win_off
+ win
->len
);
735 unsigned char* use_pack(struct packed_git
*p
,
736 struct pack_window
**w_cursor
,
740 struct pack_window
*win
= *w_cursor
;
742 if (p
->pack_fd
== -1 && open_packed_git(p
))
743 die("packfile %s cannot be accessed", p
->pack_name
);
745 /* Since packfiles end in a hash of their content and its
746 * pointless to ask for an offset into the middle of that
747 * hash, and the in_window function above wouldn't match
748 * don't allow an offset too close to the end of the file.
750 if (offset
> (p
->pack_size
- 20))
751 die("offset beyond end of packfile (truncated pack?)");
753 if (!win
|| !in_window(win
, offset
)) {
756 for (win
= p
->windows
; win
; win
= win
->next
) {
757 if (in_window(win
, offset
))
761 size_t window_align
= packed_git_window_size
/ 2;
763 win
= xcalloc(1, sizeof(*win
));
764 win
->offset
= (offset
/ window_align
) * window_align
;
765 len
= p
->pack_size
- win
->offset
;
766 if (len
> packed_git_window_size
)
767 len
= packed_git_window_size
;
768 win
->len
= (size_t)len
;
769 pack_mapped
+= win
->len
;
770 while (packed_git_limit
< pack_mapped
771 && unuse_one_window(p
, p
->pack_fd
))
773 win
->base
= xmmap(NULL
, win
->len
,
774 PROT_READ
, MAP_PRIVATE
,
775 p
->pack_fd
, win
->offset
);
776 if (win
->base
== MAP_FAILED
)
777 die("packfile %s cannot be mapped: %s",
782 if (pack_mapped
> peak_pack_mapped
)
783 peak_pack_mapped
= pack_mapped
;
784 if (pack_open_windows
> peak_pack_open_windows
)
785 peak_pack_open_windows
= pack_open_windows
;
786 win
->next
= p
->windows
;
790 if (win
!= *w_cursor
) {
791 win
->last_used
= pack_used_ctr
++;
795 offset
-= win
->offset
;
797 *left
= win
->len
- xsize_t(offset
);
798 return win
->base
+ offset
;
801 struct packed_git
*add_packed_git(const char *path
, int path_len
, int local
)
804 struct packed_git
*p
= xmalloc(sizeof(*p
) + path_len
+ 2);
807 * Make sure a corresponding .pack file exists and that
808 * the index looks sane.
810 path_len
-= strlen(".idx");
813 memcpy(p
->pack_name
, path
, path_len
);
814 strcpy(p
->pack_name
+ path_len
, ".pack");
815 if (stat(p
->pack_name
, &st
) || !S_ISREG(st
.st_mode
)) {
820 /* ok, it looks sane as far as we can check without
821 * actually mapping the pack file.
823 p
->index_version
= 0;
824 p
->index_data
= NULL
;
827 p
->pack_size
= st
.st_size
;
831 p
->pack_local
= local
;
832 p
->mtime
= st
.st_mtime
;
833 if (path_len
< 40 || get_sha1_hex(path
+ path_len
- 40, p
->sha1
))
838 struct packed_git
*parse_pack_index(unsigned char *sha1
)
840 char *path
= sha1_pack_index_name(sha1
);
841 return parse_pack_index_file(sha1
, path
);
844 struct packed_git
*parse_pack_index_file(const unsigned char *sha1
,
845 const char *idx_path
)
847 const char *path
= sha1_pack_name(sha1
);
848 struct packed_git
*p
= xmalloc(sizeof(*p
) + strlen(path
) + 2);
850 if (check_packed_git_idx(idx_path
, p
)) {
855 strcpy(p
->pack_name
, path
);
860 hashcpy(p
->sha1
, sha1
);
864 void install_packed_git(struct packed_git
*pack
)
866 pack
->next
= packed_git
;
870 static void prepare_packed_git_one(char *objdir
, int local
)
872 /* Ensure that this buffer is large enough so that we can
873 append "/pack/" without clobbering the stack even if
874 strlen(objdir) were PATH_MAX. */
875 char path
[PATH_MAX
+ 1 + 4 + 1 + 1];
880 sprintf(path
, "%s/pack", objdir
);
885 error("unable to open object pack directory: %s: %s",
886 path
, strerror(errno
));
890 while ((de
= readdir(dir
)) != NULL
) {
891 int namelen
= strlen(de
->d_name
);
892 struct packed_git
*p
;
894 if (!has_extension(de
->d_name
, ".idx"))
897 if (len
+ namelen
+ 1 > sizeof(path
))
900 /* Don't reopen a pack we already have. */
901 strcpy(path
+ len
, de
->d_name
);
902 for (p
= packed_git
; p
; p
= p
->next
) {
903 if (!memcmp(path
, p
->pack_name
, len
+ namelen
- 4))
908 /* See if it really is a valid .idx file with corresponding
909 * .pack file that we can map.
911 p
= add_packed_git(path
, len
+ namelen
, local
);
914 install_packed_git(p
);
919 static int sort_pack(const void *a_
, const void *b_
)
921 struct packed_git
*a
= *((struct packed_git
**)a_
);
922 struct packed_git
*b
= *((struct packed_git
**)b_
);
926 * Local packs tend to contain objects specific to our
927 * variant of the project than remote ones. In addition,
928 * remote ones could be on a network mounted filesystem.
929 * Favor local ones for these reasons.
931 st
= a
->pack_local
- b
->pack_local
;
936 * Younger packs tend to contain more recent objects,
937 * and more recent objects tend to get accessed more
940 if (a
->mtime
< b
->mtime
)
942 else if (a
->mtime
== b
->mtime
)
947 static void rearrange_packed_git(void)
949 struct packed_git
**ary
, *p
;
952 for (n
= 0, p
= packed_git
; p
; p
= p
->next
)
957 /* prepare an array of packed_git for easier sorting */
958 ary
= xcalloc(n
, sizeof(struct packed_git
*));
959 for (n
= 0, p
= packed_git
; p
; p
= p
->next
)
962 qsort(ary
, n
, sizeof(struct packed_git
*), sort_pack
);
964 /* link them back again */
965 for (i
= 0; i
< n
- 1; i
++)
966 ary
[i
]->next
= ary
[i
+ 1];
967 ary
[n
- 1]->next
= NULL
;
973 static int prepare_packed_git_run_once
= 0;
974 void prepare_packed_git(void)
976 struct alternate_object_database
*alt
;
978 if (prepare_packed_git_run_once
)
980 prepare_packed_git_one(get_object_directory(), 1);
982 for (alt
= alt_odb_list
; alt
; alt
= alt
->next
) {
984 prepare_packed_git_one(alt
->base
, 0);
987 rearrange_packed_git();
988 prepare_packed_git_run_once
= 1;
991 void reprepare_packed_git(void)
993 prepare_packed_git_run_once
= 0;
994 prepare_packed_git();
997 int check_sha1_signature(const unsigned char *sha1
, void *map
, unsigned long size
, const char *type
)
999 unsigned char real_sha1
[20];
1000 hash_sha1_file(map
, size
, type
, real_sha1
);
1001 return hashcmp(sha1
, real_sha1
) ? -1 : 0;
1004 static void *map_sha1_file(const unsigned char *sha1
, unsigned long *size
)
1009 char *filename
= find_sha1_file(sha1
, &st
);
1015 fd
= open(filename
, O_RDONLY
| sha1_file_open_flag
);
1017 /* See if it works without O_NOATIME */
1018 switch (sha1_file_open_flag
) {
1020 fd
= open(filename
, O_RDONLY
);
1028 /* If it failed once, it will probably fail again.
1029 * Stop using O_NOATIME
1031 sha1_file_open_flag
= 0;
1033 *size
= xsize_t(st
.st_size
);
1034 map
= xmmap(NULL
, *size
, PROT_READ
, MAP_PRIVATE
, fd
, 0);
1039 static int legacy_loose_object(unsigned char *map
)
1044 * Is it a zlib-compressed buffer? If so, the first byte
1045 * must be 0x78 (15-bit window size, deflated), and the
1046 * first 16-bit word is evenly divisible by 31
1048 word
= (map
[0] << 8) + map
[1];
1049 if (map
[0] == 0x78 && !(word
% 31))
1055 unsigned long unpack_object_header_gently(const unsigned char *buf
, unsigned long len
, enum object_type
*type
, unsigned long *sizep
)
1060 unsigned long used
= 0;
1063 *type
= (c
>> 4) & 7;
1069 if (sizeof(long) * 8 <= shift
)
1072 size
+= (c
& 0x7f) << shift
;
1079 static int unpack_sha1_header(z_stream
*stream
, unsigned char *map
, unsigned long mapsize
, void *buffer
, unsigned long bufsiz
)
1081 unsigned long size
, used
;
1082 static const char valid_loose_object_type
[8] = {
1084 1, 1, 1, 1, /* "commit", "tree", "blob", "tag" */
1085 0, /* "delta" and others are invalid in a loose object */
1087 enum object_type type
;
1089 /* Get the data stream */
1090 memset(stream
, 0, sizeof(*stream
));
1091 stream
->next_in
= map
;
1092 stream
->avail_in
= mapsize
;
1093 stream
->next_out
= buffer
;
1094 stream
->avail_out
= bufsiz
;
1096 if (legacy_loose_object(map
)) {
1097 inflateInit(stream
);
1098 return inflate(stream
, 0);
1103 * There used to be a second loose object header format which
1104 * was meant to mimic the in-pack format, allowing for direct
1105 * copy of the object data. This format turned up not to be
1106 * really worth it and we don't write it any longer. But we
1107 * can still read it.
1109 used
= unpack_object_header_gently(map
, mapsize
, &type
, &size
);
1110 if (!used
|| !valid_loose_object_type
[type
])
1115 /* Set up the stream for the rest.. */
1116 stream
->next_in
= map
;
1117 stream
->avail_in
= mapsize
;
1118 inflateInit(stream
);
1120 /* And generate the fake traditional header */
1121 stream
->total_out
= 1 + snprintf(buffer
, bufsiz
, "%s %lu",
1122 typename(type
), size
);
1126 static void *unpack_sha1_rest(z_stream
*stream
, void *buffer
, unsigned long size
, const unsigned char *sha1
)
1128 int bytes
= strlen(buffer
) + 1;
1129 unsigned char *buf
= xmalloc(1+size
);
1133 n
= stream
->total_out
- bytes
;
1136 memcpy(buf
, (char *) buffer
+ bytes
, n
);
1138 if (bytes
<= size
) {
1140 * The above condition must be (bytes <= size), not
1141 * (bytes < size). In other words, even though we
1142 * expect no more output and set avail_out to zer0,
1143 * the input zlib stream may have bytes that express
1144 * "this concludes the stream", and we *do* want to
1147 * Otherwise we would not be able to test that we
1148 * consumed all the input to reach the expected size;
1149 * we also want to check that zlib tells us that all
1150 * went well with status == Z_STREAM_END at the end.
1152 stream
->next_out
= buf
+ bytes
;
1153 stream
->avail_out
= size
- bytes
;
1154 while (status
== Z_OK
)
1155 status
= inflate(stream
, Z_FINISH
);
1158 if (status
== Z_STREAM_END
&& !stream
->avail_in
) {
1164 error("corrupt loose object '%s'", sha1_to_hex(sha1
));
1165 else if (stream
->avail_in
)
1166 error("garbage at end of loose object '%s'",
1173 * We used to just use "sscanf()", but that's actually way
1174 * too permissive for what we want to check. So do an anal
1175 * object header parse by hand.
1177 static int parse_sha1_header(const char *hdr
, unsigned long *sizep
)
1184 * The type can be at most ten bytes (including the
1185 * terminating '\0' that we add), and is followed by
1194 if (i
>= sizeof(type
))
1200 * The length must follow immediately, and be in canonical
1201 * decimal format (ie "010" is not valid).
1203 size
= *hdr
++ - '0';
1208 unsigned long c
= *hdr
- '0';
1212 size
= size
* 10 + c
;
1218 * The length must be followed by a zero byte
1220 return *hdr
? -1 : type_from_string(type
);
1223 static void *unpack_sha1_file(void *map
, unsigned long mapsize
, enum object_type
*type
, unsigned long *size
, const unsigned char *sha1
)
1229 ret
= unpack_sha1_header(&stream
, map
, mapsize
, hdr
, sizeof(hdr
));
1230 if (ret
< Z_OK
|| (*type
= parse_sha1_header(hdr
, size
)) < 0)
1233 return unpack_sha1_rest(&stream
, hdr
, *size
, sha1
);
1236 unsigned long get_size_from_delta(struct packed_git
*p
,
1237 struct pack_window
**w_curs
,
1240 const unsigned char *data
;
1241 unsigned char delta_head
[20], *in
;
1245 memset(&stream
, 0, sizeof(stream
));
1246 stream
.next_out
= delta_head
;
1247 stream
.avail_out
= sizeof(delta_head
);
1249 inflateInit(&stream
);
1251 in
= use_pack(p
, w_curs
, curpos
, &stream
.avail_in
);
1252 stream
.next_in
= in
;
1253 st
= inflate(&stream
, Z_FINISH
);
1254 curpos
+= stream
.next_in
- in
;
1255 } while ((st
== Z_OK
|| st
== Z_BUF_ERROR
) &&
1256 stream
.total_out
< sizeof(delta_head
));
1257 inflateEnd(&stream
);
1258 if ((st
!= Z_STREAM_END
) && stream
.total_out
!= sizeof(delta_head
))
1259 die("delta data unpack-initial failed");
1261 /* Examine the initial part of the delta to figure out
1266 /* ignore base size */
1267 get_delta_hdr_size(&data
, delta_head
+sizeof(delta_head
));
1269 /* Read the result size */
1270 return get_delta_hdr_size(&data
, delta_head
+sizeof(delta_head
));
1273 static off_t
get_delta_base(struct packed_git
*p
,
1274 struct pack_window
**w_curs
,
1276 enum object_type type
,
1277 off_t delta_obj_offset
)
1279 unsigned char *base_info
= use_pack(p
, w_curs
, *curpos
, NULL
);
1282 /* use_pack() assured us we have [base_info, base_info + 20)
1283 * as a range that we can look at without walking off the
1284 * end of the mapped window. Its actually the hash size
1285 * that is assured. An OFS_DELTA longer than the hash size
1286 * is stupid, as then a REF_DELTA would be smaller to store.
1288 if (type
== OBJ_OFS_DELTA
) {
1290 unsigned char c
= base_info
[used
++];
1291 base_offset
= c
& 127;
1294 if (!base_offset
|| MSB(base_offset
, 7))
1295 die("offset value overflow for delta base object");
1296 c
= base_info
[used
++];
1297 base_offset
= (base_offset
<< 7) + (c
& 127);
1299 base_offset
= delta_obj_offset
- base_offset
;
1300 if (base_offset
>= delta_obj_offset
)
1301 die("delta base offset out of bound");
1303 } else if (type
== OBJ_REF_DELTA
) {
1304 /* The base entry _must_ be in the same pack */
1305 base_offset
= find_pack_entry_one(base_info
, p
);
1307 die("failed to find delta-pack base object %s",
1308 sha1_to_hex(base_info
));
1311 die("I am totally screwed");
1315 /* forward declaration for a mutually recursive function */
1316 static int packed_object_info(struct packed_git
*p
, off_t offset
,
1317 unsigned long *sizep
);
1319 static int packed_delta_info(struct packed_git
*p
,
1320 struct pack_window
**w_curs
,
1322 enum object_type type
,
1324 unsigned long *sizep
)
1328 base_offset
= get_delta_base(p
, w_curs
, &curpos
, type
, obj_offset
);
1329 type
= packed_object_info(p
, base_offset
, NULL
);
1331 /* We choose to only get the type of the base object and
1332 * ignore potentially corrupt pack file that expects the delta
1333 * based on a base with a wrong size. This saves tons of
1337 *sizep
= get_size_from_delta(p
, w_curs
, curpos
);
1342 static int unpack_object_header(struct packed_git
*p
,
1343 struct pack_window
**w_curs
,
1345 unsigned long *sizep
)
1347 unsigned char *base
;
1350 enum object_type type
;
1352 /* use_pack() assures us we have [base, base + 20) available
1353 * as a range that we can look at at. (Its actually the hash
1354 * size that is assured.) With our object header encoding
1355 * the maximum deflated object size is 2^137, which is just
1356 * insane, so we know won't exceed what we have been given.
1358 base
= use_pack(p
, w_curs
, *curpos
, &left
);
1359 used
= unpack_object_header_gently(base
, left
, &type
, sizep
);
1361 die("object offset outside of pack file");
1367 const char *packed_object_info_detail(struct packed_git
*p
,
1369 unsigned long *size
,
1370 unsigned long *store_size
,
1371 unsigned int *delta_chain_length
,
1372 unsigned char *base_sha1
)
1374 struct pack_window
*w_curs
= NULL
;
1376 unsigned long dummy
;
1377 unsigned char *next_sha1
;
1378 enum object_type type
;
1379 struct revindex_entry
*revidx
;
1381 *delta_chain_length
= 0;
1382 curpos
= obj_offset
;
1383 type
= unpack_object_header(p
, &w_curs
, &curpos
, size
);
1385 revidx
= find_pack_revindex(p
, obj_offset
);
1386 *store_size
= revidx
[1].offset
- obj_offset
;
1391 die("pack %s contains unknown object type %d",
1392 p
->pack_name
, type
);
1397 unuse_pack(&w_curs
);
1398 return typename(type
);
1400 obj_offset
= get_delta_base(p
, &w_curs
, &curpos
, type
, obj_offset
);
1401 if (*delta_chain_length
== 0) {
1402 revidx
= find_pack_revindex(p
, obj_offset
);
1403 hashcpy(base_sha1
, nth_packed_object_sha1(p
, revidx
->nr
));
1407 next_sha1
= use_pack(p
, &w_curs
, curpos
, NULL
);
1408 if (*delta_chain_length
== 0)
1409 hashcpy(base_sha1
, next_sha1
);
1410 obj_offset
= find_pack_entry_one(next_sha1
, p
);
1413 (*delta_chain_length
)++;
1414 curpos
= obj_offset
;
1415 type
= unpack_object_header(p
, &w_curs
, &curpos
, &dummy
);
1419 static int packed_object_info(struct packed_git
*p
, off_t obj_offset
,
1420 unsigned long *sizep
)
1422 struct pack_window
*w_curs
= NULL
;
1424 off_t curpos
= obj_offset
;
1425 enum object_type type
;
1427 type
= unpack_object_header(p
, &w_curs
, &curpos
, &size
);
1432 type
= packed_delta_info(p
, &w_curs
, curpos
,
1433 type
, obj_offset
, sizep
);
1443 die("pack %s contains unknown object type %d",
1444 p
->pack_name
, type
);
1446 unuse_pack(&w_curs
);
1450 static void *unpack_compressed_entry(struct packed_git
*p
,
1451 struct pack_window
**w_curs
,
1457 unsigned char *buffer
, *in
;
1459 buffer
= xmalloc(size
+ 1);
1461 memset(&stream
, 0, sizeof(stream
));
1462 stream
.next_out
= buffer
;
1463 stream
.avail_out
= size
;
1465 inflateInit(&stream
);
1467 in
= use_pack(p
, w_curs
, curpos
, &stream
.avail_in
);
1468 stream
.next_in
= in
;
1469 st
= inflate(&stream
, Z_FINISH
);
1470 curpos
+= stream
.next_in
- in
;
1471 } while (st
== Z_OK
|| st
== Z_BUF_ERROR
);
1472 inflateEnd(&stream
);
1473 if ((st
!= Z_STREAM_END
) || stream
.total_out
!= size
) {
1481 #define MAX_DELTA_CACHE (256)
1483 static size_t delta_base_cached
;
1485 static struct delta_base_cache_lru_list
{
1486 struct delta_base_cache_lru_list
*prev
;
1487 struct delta_base_cache_lru_list
*next
;
1488 } delta_base_cache_lru
= { &delta_base_cache_lru
, &delta_base_cache_lru
};
1490 static struct delta_base_cache_entry
{
1491 struct delta_base_cache_lru_list lru
;
1493 struct packed_git
*p
;
1496 enum object_type type
;
1497 } delta_base_cache
[MAX_DELTA_CACHE
];
1499 static unsigned long pack_entry_hash(struct packed_git
*p
, off_t base_offset
)
1503 hash
= (unsigned long)p
+ (unsigned long)base_offset
;
1504 hash
+= (hash
>> 8) + (hash
>> 16);
1505 return hash
% MAX_DELTA_CACHE
;
1508 static void *cache_or_unpack_entry(struct packed_git
*p
, off_t base_offset
,
1509 unsigned long *base_size
, enum object_type
*type
, int keep_cache
)
1512 unsigned long hash
= pack_entry_hash(p
, base_offset
);
1513 struct delta_base_cache_entry
*ent
= delta_base_cache
+ hash
;
1516 if (ret
&& ent
->p
== p
&& ent
->base_offset
== base_offset
)
1517 goto found_cache_entry
;
1518 return unpack_entry(p
, base_offset
, type
, base_size
);
1523 ent
->lru
.next
->prev
= ent
->lru
.prev
;
1524 ent
->lru
.prev
->next
= ent
->lru
.next
;
1525 delta_base_cached
-= ent
->size
;
1527 ret
= xmemdupz(ent
->data
, ent
->size
);
1530 *base_size
= ent
->size
;
1534 static inline void release_delta_base_cache(struct delta_base_cache_entry
*ent
)
1539 ent
->lru
.next
->prev
= ent
->lru
.prev
;
1540 ent
->lru
.prev
->next
= ent
->lru
.next
;
1541 delta_base_cached
-= ent
->size
;
1545 static void add_delta_base_cache(struct packed_git
*p
, off_t base_offset
,
1546 void *base
, unsigned long base_size
, enum object_type type
)
1548 unsigned long hash
= pack_entry_hash(p
, base_offset
);
1549 struct delta_base_cache_entry
*ent
= delta_base_cache
+ hash
;
1550 struct delta_base_cache_lru_list
*lru
;
1552 release_delta_base_cache(ent
);
1553 delta_base_cached
+= base_size
;
1555 for (lru
= delta_base_cache_lru
.next
;
1556 delta_base_cached
> delta_base_cache_limit
1557 && lru
!= &delta_base_cache_lru
;
1559 struct delta_base_cache_entry
*f
= (void *)lru
;
1560 if (f
->type
== OBJ_BLOB
)
1561 release_delta_base_cache(f
);
1563 for (lru
= delta_base_cache_lru
.next
;
1564 delta_base_cached
> delta_base_cache_limit
1565 && lru
!= &delta_base_cache_lru
;
1567 struct delta_base_cache_entry
*f
= (void *)lru
;
1568 release_delta_base_cache(f
);
1572 ent
->base_offset
= base_offset
;
1575 ent
->size
= base_size
;
1576 ent
->lru
.next
= &delta_base_cache_lru
;
1577 ent
->lru
.prev
= delta_base_cache_lru
.prev
;
1578 delta_base_cache_lru
.prev
->next
= &ent
->lru
;
1579 delta_base_cache_lru
.prev
= &ent
->lru
;
1582 static void *unpack_delta_entry(struct packed_git
*p
,
1583 struct pack_window
**w_curs
,
1585 unsigned long delta_size
,
1587 enum object_type
*type
,
1588 unsigned long *sizep
)
1590 void *delta_data
, *result
, *base
;
1591 unsigned long base_size
;
1594 base_offset
= get_delta_base(p
, w_curs
, &curpos
, *type
, obj_offset
);
1595 base
= cache_or_unpack_entry(p
, base_offset
, &base_size
, type
, 0);
1597 die("failed to read delta base object"
1598 " at %"PRIuMAX
" from %s",
1599 (uintmax_t)base_offset
, p
->pack_name
);
1601 delta_data
= unpack_compressed_entry(p
, w_curs
, curpos
, delta_size
);
1603 die("failed to unpack compressed delta"
1604 " at %"PRIuMAX
" from %s",
1605 (uintmax_t)curpos
, p
->pack_name
);
1606 result
= patch_delta(base
, base_size
,
1607 delta_data
, delta_size
,
1610 die("failed to apply delta");
1612 add_delta_base_cache(p
, base_offset
, base
, base_size
, *type
);
1616 void *unpack_entry(struct packed_git
*p
, off_t obj_offset
,
1617 enum object_type
*type
, unsigned long *sizep
)
1619 struct pack_window
*w_curs
= NULL
;
1620 off_t curpos
= obj_offset
;
1623 *type
= unpack_object_header(p
, &w_curs
, &curpos
, sizep
);
1627 data
= unpack_delta_entry(p
, &w_curs
, curpos
, *sizep
,
1628 obj_offset
, type
, sizep
);
1634 data
= unpack_compressed_entry(p
, &w_curs
, curpos
, *sizep
);
1637 die("unknown object type %i in %s", *type
, p
->pack_name
);
1639 unuse_pack(&w_curs
);
1643 const unsigned char *nth_packed_object_sha1(struct packed_git
*p
,
1646 const unsigned char *index
= p
->index_data
;
1648 if (open_pack_index(p
))
1650 index
= p
->index_data
;
1652 if (n
>= p
->num_objects
)
1655 if (p
->index_version
== 1) {
1656 return index
+ 24 * n
+ 4;
1659 return index
+ 20 * n
;
1663 static off_t
nth_packed_object_offset(const struct packed_git
*p
, uint32_t n
)
1665 const unsigned char *index
= p
->index_data
;
1667 if (p
->index_version
== 1) {
1668 return ntohl(*((uint32_t *)(index
+ 24 * n
)));
1671 index
+= 8 + p
->num_objects
* (20 + 4);
1672 off
= ntohl(*((uint32_t *)(index
+ 4 * n
)));
1673 if (!(off
& 0x80000000))
1675 index
+= p
->num_objects
* 4 + (off
& 0x7fffffff) * 8;
1676 return (((uint64_t)ntohl(*((uint32_t *)(index
+ 0)))) << 32) |
1677 ntohl(*((uint32_t *)(index
+ 4)));
1681 off_t
find_pack_entry_one(const unsigned char *sha1
,
1682 struct packed_git
*p
)
1684 const uint32_t *level1_ofs
= p
->index_data
;
1685 const unsigned char *index
= p
->index_data
;
1689 if (open_pack_index(p
))
1691 level1_ofs
= p
->index_data
;
1692 index
= p
->index_data
;
1694 if (p
->index_version
> 1) {
1699 hi
= ntohl(level1_ofs
[*sha1
]);
1700 lo
= ((*sha1
== 0x0) ? 0 : ntohl(level1_ofs
[*sha1
- 1]));
1703 unsigned mi
= (lo
+ hi
) / 2;
1704 unsigned x
= (p
->index_version
> 1) ? (mi
* 20) : (mi
* 24 + 4);
1705 int cmp
= hashcmp(index
+ x
, sha1
);
1707 return nth_packed_object_offset(p
, mi
);
1716 int matches_pack_name(struct packed_git
*p
, const char *name
)
1718 const char *last_c
, *c
;
1720 if (!strcmp(p
->pack_name
, name
))
1723 for (c
= p
->pack_name
, last_c
= c
; *c
;)
1728 if (!strcmp(last_c
, name
))
1734 static int find_pack_entry(const unsigned char *sha1
, struct pack_entry
*e
, const char **ignore_packed
)
1736 static struct packed_git
*last_found
= (void *)1;
1737 struct packed_git
*p
;
1740 prepare_packed_git();
1743 p
= (last_found
== (void *)1) ? packed_git
: last_found
;
1746 if (ignore_packed
) {
1748 for (ig
= ignore_packed
; *ig
; ig
++)
1749 if (matches_pack_name(p
, *ig
))
1755 offset
= find_pack_entry_one(sha1
, p
);
1758 * We are about to tell the caller where they can
1759 * locate the requested object. We better make
1760 * sure the packfile is still here and can be
1761 * accessed before supplying that answer, as
1762 * it may have been deleted since the index
1765 if (p
->pack_fd
== -1 && open_packed_git(p
)) {
1766 error("packfile %s cannot be accessed", p
->pack_name
);
1771 hashcpy(e
->sha1
, sha1
);
1777 if (p
== last_found
)
1781 if (p
== last_found
)
1787 struct packed_git
*find_sha1_pack(const unsigned char *sha1
,
1788 struct packed_git
*packs
)
1790 struct packed_git
*p
;
1792 for (p
= packs
; p
; p
= p
->next
) {
1793 if (find_pack_entry_one(sha1
, p
))
1800 static int sha1_loose_object_info(const unsigned char *sha1
, unsigned long *sizep
)
1803 unsigned long mapsize
, size
;
1808 map
= map_sha1_file(sha1
, &mapsize
);
1810 return error("unable to find %s", sha1_to_hex(sha1
));
1811 if (unpack_sha1_header(&stream
, map
, mapsize
, hdr
, sizeof(hdr
)) < 0)
1812 status
= error("unable to unpack %s header",
1814 else if ((status
= parse_sha1_header(hdr
, &size
)) < 0)
1815 status
= error("unable to parse %s header", sha1_to_hex(sha1
));
1818 inflateEnd(&stream
);
1819 munmap(map
, mapsize
);
1823 int sha1_object_info(const unsigned char *sha1
, unsigned long *sizep
)
1825 struct pack_entry e
;
1827 if (!find_pack_entry(sha1
, &e
, NULL
)) {
1828 reprepare_packed_git();
1829 if (!find_pack_entry(sha1
, &e
, NULL
))
1830 return sha1_loose_object_info(sha1
, sizep
);
1832 return packed_object_info(e
.p
, e
.offset
, sizep
);
1835 static void *read_packed_sha1(const unsigned char *sha1
,
1836 enum object_type
*type
, unsigned long *size
)
1838 struct pack_entry e
;
1840 if (!find_pack_entry(sha1
, &e
, NULL
))
1843 return cache_or_unpack_entry(e
.p
, e
.offset
, size
, type
, 1);
1847 * This is meant to hold a *small* number of objects that you would
1848 * want read_sha1_file() to be able to return, but yet you do not want
1849 * to write them into the object store (e.g. a browse-only
1852 static struct cached_object
{
1853 unsigned char sha1
[20];
1854 enum object_type type
;
1858 static int cached_object_nr
, cached_object_alloc
;
1860 static struct cached_object empty_tree
= {
1861 /* empty tree sha1: 4b825dc642cb6eb9a060e54bf8d69288fbee4904 */
1862 "\x4b\x82\x5d\xc6\x42\xcb\x6e\xb9\xa0\x60"
1863 "\xe5\x4b\xf8\xd6\x92\x88\xfb\xee\x49\x04",
1869 static struct cached_object
*find_cached_object(const unsigned char *sha1
)
1872 struct cached_object
*co
= cached_objects
;
1874 for (i
= 0; i
< cached_object_nr
; i
++, co
++) {
1875 if (!hashcmp(co
->sha1
, sha1
))
1878 if (!hashcmp(sha1
, empty_tree
.sha1
))
1883 int pretend_sha1_file(void *buf
, unsigned long len
, enum object_type type
,
1884 unsigned char *sha1
)
1886 struct cached_object
*co
;
1888 hash_sha1_file(buf
, len
, typename(type
), sha1
);
1889 if (has_sha1_file(sha1
) || find_cached_object(sha1
))
1891 if (cached_object_alloc
<= cached_object_nr
) {
1892 cached_object_alloc
= alloc_nr(cached_object_alloc
);
1893 cached_objects
= xrealloc(cached_objects
,
1894 sizeof(*cached_objects
) *
1895 cached_object_alloc
);
1897 co
= &cached_objects
[cached_object_nr
++];
1900 co
->buf
= xmalloc(len
);
1901 memcpy(co
->buf
, buf
, len
);
1902 hashcpy(co
->sha1
, sha1
);
1906 void *read_sha1_file(const unsigned char *sha1
, enum object_type
*type
,
1907 unsigned long *size
)
1909 unsigned long mapsize
;
1911 struct cached_object
*co
;
1913 co
= find_cached_object(sha1
);
1917 return xmemdupz(co
->buf
, co
->size
);
1920 buf
= read_packed_sha1(sha1
, type
, size
);
1923 map
= map_sha1_file(sha1
, &mapsize
);
1925 buf
= unpack_sha1_file(map
, mapsize
, type
, size
, sha1
);
1926 munmap(map
, mapsize
);
1929 reprepare_packed_git();
1930 return read_packed_sha1(sha1
, type
, size
);
1933 void *read_object_with_reference(const unsigned char *sha1
,
1934 const char *required_type_name
,
1935 unsigned long *size
,
1936 unsigned char *actual_sha1_return
)
1938 enum object_type type
, required_type
;
1940 unsigned long isize
;
1941 unsigned char actual_sha1
[20];
1943 required_type
= type_from_string(required_type_name
);
1944 hashcpy(actual_sha1
, sha1
);
1946 int ref_length
= -1;
1947 const char *ref_type
= NULL
;
1949 buffer
= read_sha1_file(actual_sha1
, &type
, &isize
);
1952 if (type
== required_type
) {
1954 if (actual_sha1_return
)
1955 hashcpy(actual_sha1_return
, actual_sha1
);
1958 /* Handle references */
1959 else if (type
== OBJ_COMMIT
)
1961 else if (type
== OBJ_TAG
)
1962 ref_type
= "object ";
1967 ref_length
= strlen(ref_type
);
1969 if (ref_length
+ 40 > isize
||
1970 memcmp(buffer
, ref_type
, ref_length
) ||
1971 get_sha1_hex((char *) buffer
+ ref_length
, actual_sha1
)) {
1976 /* Now we have the ID of the referred-to object in
1977 * actual_sha1. Check again. */
1981 static void write_sha1_file_prepare(const void *buf
, unsigned long len
,
1982 const char *type
, unsigned char *sha1
,
1983 char *hdr
, int *hdrlen
)
1987 /* Generate the header */
1988 *hdrlen
= sprintf(hdr
, "%s %lu", type
, len
)+1;
1992 SHA1_Update(&c
, hdr
, *hdrlen
);
1993 SHA1_Update(&c
, buf
, len
);
1994 SHA1_Final(sha1
, &c
);
1998 * Link the tempfile to the final place, possibly creating the
1999 * last directory level as you do so.
2001 * Returns the errno on failure, 0 on success.
2003 static int link_temp_to_file(const char *tmpfile
, const char *filename
)
2008 if (!link(tmpfile
, filename
))
2012 * Try to mkdir the last path component if that failed.
2014 * Re-try the "link()" regardless of whether the mkdir
2015 * succeeds, since a race might mean that somebody
2019 dir
= strrchr(filename
, '/');
2022 if (!mkdir(filename
, 0777) && adjust_shared_perm(filename
)) {
2027 if (!link(tmpfile
, filename
))
2035 * Move the just written object into its final resting place
2037 int move_temp_to_file(const char *tmpfile
, const char *filename
)
2039 int ret
= link_temp_to_file(tmpfile
, filename
);
2042 * Coda hack - coda doesn't like cross-directory links,
2043 * so we fall back to a rename, which will mean that it
2044 * won't be able to check collisions, but that's not a
2047 * The same holds for FAT formatted media.
2049 * When this succeeds, we just return 0. We have nothing
2052 if (ret
&& ret
!= EEXIST
) {
2053 if (!rename(tmpfile
, filename
))
2059 if (ret
!= EEXIST
) {
2060 return error("unable to write sha1 filename %s: %s\n", filename
, strerror(ret
));
2062 /* FIXME!!! Collision check here ? */
2068 static int write_buffer(int fd
, const void *buf
, size_t len
)
2070 if (write_in_full(fd
, buf
, len
) < 0)
2071 return error("file write error (%s)", strerror(errno
));
2075 int hash_sha1_file(const void *buf
, unsigned long len
, const char *type
,
2076 unsigned char *sha1
)
2080 write_sha1_file_prepare(buf
, len
, type
, sha1
, hdr
, &hdrlen
);
2084 int write_sha1_file(void *buf
, unsigned long len
, const char *type
, unsigned char *returnsha1
)
2087 unsigned char *compressed
;
2089 unsigned char sha1
[20];
2091 static char tmpfile
[PATH_MAX
];
2095 /* Normally if we have it in the pack then we do not bother writing
2096 * it out into .git/objects/??/?{38} file.
2098 write_sha1_file_prepare(buf
, len
, type
, sha1
, hdr
, &hdrlen
);
2099 filename
= sha1_file_name(sha1
);
2101 hashcpy(returnsha1
, sha1
);
2102 if (has_sha1_file(sha1
))
2104 fd
= open(filename
, O_RDONLY
);
2107 * FIXME!!! We might do collision checking here, but we'd
2108 * need to uncompress the old file and check it. Later.
2114 if (errno
!= ENOENT
) {
2115 return error("sha1 file %s: %s\n", filename
, strerror(errno
));
2118 snprintf(tmpfile
, sizeof(tmpfile
), "%s/tmp_obj_XXXXXX", get_object_directory());
2120 fd
= mkstemp(tmpfile
);
2123 return error("insufficient permission for adding an object to repository database %s\n", get_object_directory());
2125 return error("unable to create temporary sha1 filename %s: %s\n", tmpfile
, strerror(errno
));
2129 memset(&stream
, 0, sizeof(stream
));
2130 deflateInit(&stream
, zlib_compression_level
);
2131 size
= 8 + deflateBound(&stream
, len
+hdrlen
);
2132 compressed
= xmalloc(size
);
2135 stream
.next_out
= compressed
;
2136 stream
.avail_out
= size
;
2138 /* First header.. */
2139 stream
.next_in
= (unsigned char *)hdr
;
2140 stream
.avail_in
= hdrlen
;
2141 while (deflate(&stream
, 0) == Z_OK
)
2144 /* Then the data itself.. */
2145 stream
.next_in
= buf
;
2146 stream
.avail_in
= len
;
2147 ret
= deflate(&stream
, Z_FINISH
);
2148 if (ret
!= Z_STREAM_END
)
2149 die("unable to deflate new object %s (%d)", sha1_to_hex(sha1
), ret
);
2151 ret
= deflateEnd(&stream
);
2153 die("deflateEnd on object %s failed (%d)", sha1_to_hex(sha1
), ret
);
2155 size
= stream
.total_out
;
2157 if (write_buffer(fd
, compressed
, size
) < 0)
2158 die("unable to write sha1 file");
2161 die("unable to write sha1 file");
2164 return move_temp_to_file(tmpfile
, filename
);
2168 * We need to unpack and recompress the object for writing
2169 * it out to a different file.
2171 static void *repack_object(const unsigned char *sha1
, unsigned long *objsize
)
2175 unsigned char *unpacked
;
2177 enum object_type type
;
2182 /* need to unpack and recompress it by itself */
2183 unpacked
= read_packed_sha1(sha1
, &type
, &len
);
2185 error("cannot read sha1_file for %s", sha1_to_hex(sha1
));
2187 hdrlen
= sprintf(hdr
, "%s %lu", typename(type
), len
) + 1;
2190 memset(&stream
, 0, sizeof(stream
));
2191 deflateInit(&stream
, zlib_compression_level
);
2192 size
= deflateBound(&stream
, len
+ hdrlen
);
2193 buf
= xmalloc(size
);
2196 stream
.next_out
= buf
;
2197 stream
.avail_out
= size
;
2199 /* First header.. */
2200 stream
.next_in
= (void *)hdr
;
2201 stream
.avail_in
= hdrlen
;
2202 while (deflate(&stream
, 0) == Z_OK
)
2205 /* Then the data itself.. */
2206 stream
.next_in
= unpacked
;
2207 stream
.avail_in
= len
;
2208 while (deflate(&stream
, Z_FINISH
) == Z_OK
)
2210 deflateEnd(&stream
);
2213 *objsize
= stream
.total_out
;
2217 int write_sha1_to_fd(int fd
, const unsigned char *sha1
)
2220 unsigned long objsize
;
2221 void *buf
= map_sha1_file(sha1
, &objsize
);
2224 retval
= write_buffer(fd
, buf
, objsize
);
2225 munmap(buf
, objsize
);
2229 buf
= repack_object(sha1
, &objsize
);
2230 retval
= write_buffer(fd
, buf
, objsize
);
2235 int write_sha1_from_fd(const unsigned char *sha1
, int fd
, char *buffer
,
2236 size_t bufsize
, size_t *bufposn
)
2238 char tmpfile
[PATH_MAX
];
2241 unsigned char real_sha1
[20];
2242 unsigned char discard
[4096];
2246 snprintf(tmpfile
, sizeof(tmpfile
), "%s/tmp_obj_XXXXXX", get_object_directory());
2248 local
= mkstemp(tmpfile
);
2251 return error("insufficient permission for adding an object to repository database %s\n", get_object_directory());
2253 return error("unable to create temporary sha1 filename %s: %s\n", tmpfile
, strerror(errno
));
2256 memset(&stream
, 0, sizeof(stream
));
2258 inflateInit(&stream
);
2265 stream
.avail_in
= *bufposn
;
2266 stream
.next_in
= (unsigned char *) buffer
;
2268 stream
.next_out
= discard
;
2269 stream
.avail_out
= sizeof(discard
);
2270 ret
= inflate(&stream
, Z_SYNC_FLUSH
);
2271 SHA1_Update(&c
, discard
, sizeof(discard
) -
2273 } while (stream
.avail_in
&& ret
== Z_OK
);
2274 if (write_buffer(local
, buffer
, *bufposn
- stream
.avail_in
) < 0)
2275 die("unable to write sha1 file");
2276 memmove(buffer
, buffer
+ *bufposn
- stream
.avail_in
,
2278 *bufposn
= stream
.avail_in
;
2282 size
= xread(fd
, buffer
+ *bufposn
, bufsize
- *bufposn
);
2287 return error("Connection closed?");
2288 perror("Reading from connection");
2293 inflateEnd(&stream
);
2295 fchmod(local
, 0444);
2296 if (close(local
) != 0)
2297 die("unable to write sha1 file");
2298 SHA1_Final(real_sha1
, &c
);
2299 if (ret
!= Z_STREAM_END
) {
2301 return error("File %s corrupted", sha1_to_hex(sha1
));
2303 if (hashcmp(sha1
, real_sha1
)) {
2305 return error("File %s has bad hash", sha1_to_hex(sha1
));
2308 return move_temp_to_file(tmpfile
, sha1_file_name(sha1
));
2311 int has_pack_index(const unsigned char *sha1
)
2314 if (stat(sha1_pack_index_name(sha1
), &st
))
2319 int has_pack_file(const unsigned char *sha1
)
2322 if (stat(sha1_pack_name(sha1
), &st
))
2327 int has_sha1_pack(const unsigned char *sha1
, const char **ignore_packed
)
2329 struct pack_entry e
;
2330 return find_pack_entry(sha1
, &e
, ignore_packed
);
2333 int has_sha1_file(const unsigned char *sha1
)
2336 struct pack_entry e
;
2338 if (find_pack_entry(sha1
, &e
, NULL
))
2340 return find_sha1_file(sha1
, &st
) ? 1 : 0;
2343 int index_pipe(unsigned char *sha1
, int fd
, const char *type
, int write_object
)
2348 strbuf_init(&buf
, 0);
2349 if (strbuf_read(&buf
, fd
, 4096) < 0) {
2350 strbuf_release(&buf
);
2357 ret
= write_sha1_file(buf
.buf
, buf
.len
, type
, sha1
);
2359 ret
= hash_sha1_file(buf
.buf
, buf
.len
, type
, sha1
);
2360 strbuf_release(&buf
);
2365 int index_fd(unsigned char *sha1
, int fd
, struct stat
*st
, int write_object
,
2366 enum object_type type
, const char *path
)
2368 size_t size
= xsize_t(st
->st_size
);
2370 int ret
, re_allocated
= 0;
2373 buf
= xmmap(NULL
, size
, PROT_READ
, MAP_PRIVATE
, fd
, 0);
2380 * Convert blobs to git internal format
2382 if ((type
== OBJ_BLOB
) && S_ISREG(st
->st_mode
)) {
2384 strbuf_init(&nbuf
, 0);
2385 if (convert_to_git(path
, buf
, size
, &nbuf
,
2386 write_object
? safe_crlf
: 0)) {
2388 buf
= strbuf_detach(&nbuf
, &size
);
2394 ret
= write_sha1_file(buf
, size
, typename(type
), sha1
);
2396 ret
= hash_sha1_file(buf
, size
, typename(type
), sha1
);
2406 int index_path(unsigned char *sha1
, const char *path
, struct stat
*st
, int write_object
)
2412 switch (st
->st_mode
& S_IFMT
) {
2414 fd
= open(path
, O_RDONLY
);
2416 return error("open(\"%s\"): %s", path
,
2418 if (index_fd(sha1
, fd
, st
, write_object
, OBJ_BLOB
, path
) < 0)
2419 return error("%s: failed to insert into database",
2423 len
= xsize_t(st
->st_size
);
2424 target
= xmalloc(len
+ 1);
2425 if (readlink(path
, target
, len
+ 1) != st
->st_size
) {
2426 char *errstr
= strerror(errno
);
2428 return error("readlink(\"%s\"): %s", path
,
2432 hash_sha1_file(target
, len
, blob_type
, sha1
);
2433 else if (write_sha1_file(target
, len
, blob_type
, sha1
))
2434 return error("%s: failed to insert into database",
2439 return resolve_gitlink_ref(path
, "HEAD", sha1
);
2441 return error("%s: unsupported file type", path
);
2446 int read_pack_header(int fd
, struct pack_header
*header
)
2448 char *c
= (char*)header
;
2449 ssize_t remaining
= sizeof(struct pack_header
);
2451 ssize_t r
= xread(fd
, c
, remaining
);
2453 /* "eof before pack header was fully read" */
2454 return PH_ERROR_EOF
;
2457 } while (remaining
> 0);
2458 if (header
->hdr_signature
!= htonl(PACK_SIGNATURE
))
2459 /* "protocol error (pack signature mismatch detected)" */
2460 return PH_ERROR_PACK_SIGNATURE
;
2461 if (!pack_version_ok(header
->hdr_version
))
2462 /* "protocol error (pack version unsupported)" */
2463 return PH_ERROR_PROTOCOL
;