2 * GIT - The information manager from hell
4 * Copyright (C) Linus Torvalds, 2005
6 * This handles basic git sha1 object files - packing, unpacking,
18 #if defined(__linux__) && (defined(__i386__) || defined(__PPC__))
19 #define O_NOATIME 01000000
31 const unsigned char null_sha1
[20];
33 static unsigned int sha1_file_open_flag
= O_NOATIME
;
35 signed char hexval_table
[256] = {
36 -1, -1, -1, -1, -1, -1, -1, -1, /* 00-07 */
37 -1, -1, -1, -1, -1, -1, -1, -1, /* 08-0f */
38 -1, -1, -1, -1, -1, -1, -1, -1, /* 10-17 */
39 -1, -1, -1, -1, -1, -1, -1, -1, /* 18-1f */
40 -1, -1, -1, -1, -1, -1, -1, -1, /* 20-27 */
41 -1, -1, -1, -1, -1, -1, -1, -1, /* 28-2f */
42 0, 1, 2, 3, 4, 5, 6, 7, /* 30-37 */
43 8, 9, -1, -1, -1, -1, -1, -1, /* 38-3f */
44 -1, 10, 11, 12, 13, 14, 15, -1, /* 40-47 */
45 -1, -1, -1, -1, -1, -1, -1, -1, /* 48-4f */
46 -1, -1, -1, -1, -1, -1, -1, -1, /* 50-57 */
47 -1, -1, -1, -1, -1, -1, -1, -1, /* 58-5f */
48 -1, 10, 11, 12, 13, 14, 15, -1, /* 60-67 */
49 -1, -1, -1, -1, -1, -1, -1, -1, /* 68-67 */
50 -1, -1, -1, -1, -1, -1, -1, -1, /* 70-77 */
51 -1, -1, -1, -1, -1, -1, -1, -1, /* 78-7f */
52 -1, -1, -1, -1, -1, -1, -1, -1, /* 80-87 */
53 -1, -1, -1, -1, -1, -1, -1, -1, /* 88-8f */
54 -1, -1, -1, -1, -1, -1, -1, -1, /* 90-97 */
55 -1, -1, -1, -1, -1, -1, -1, -1, /* 98-9f */
56 -1, -1, -1, -1, -1, -1, -1, -1, /* a0-a7 */
57 -1, -1, -1, -1, -1, -1, -1, -1, /* a8-af */
58 -1, -1, -1, -1, -1, -1, -1, -1, /* b0-b7 */
59 -1, -1, -1, -1, -1, -1, -1, -1, /* b8-bf */
60 -1, -1, -1, -1, -1, -1, -1, -1, /* c0-c7 */
61 -1, -1, -1, -1, -1, -1, -1, -1, /* c8-cf */
62 -1, -1, -1, -1, -1, -1, -1, -1, /* d0-d7 */
63 -1, -1, -1, -1, -1, -1, -1, -1, /* d8-df */
64 -1, -1, -1, -1, -1, -1, -1, -1, /* e0-e7 */
65 -1, -1, -1, -1, -1, -1, -1, -1, /* e8-ef */
66 -1, -1, -1, -1, -1, -1, -1, -1, /* f0-f7 */
67 -1, -1, -1, -1, -1, -1, -1, -1, /* f8-ff */
70 int get_sha1_hex(const char *hex
, unsigned char *sha1
)
73 for (i
= 0; i
< 20; i
++) {
74 unsigned int val
= (hexval(hex
[0]) << 4) | hexval(hex
[1]);
83 int safe_create_leading_directories(char *path
)
92 pos
= strchr(pos
, '/');
96 if (!stat(path
, &st
)) {
98 if (!S_ISDIR(st
.st_mode
)) {
103 else if (mkdir(path
, 0777)) {
107 else if (adjust_shared_perm(path
)) {
116 char * sha1_to_hex(const unsigned char *sha1
)
119 static char hexbuffer
[4][50];
120 static const char hex
[] = "0123456789abcdef";
121 char *buffer
= hexbuffer
[3 & ++bufno
], *buf
= buffer
;
124 for (i
= 0; i
< 20; i
++) {
125 unsigned int val
= *sha1
++;
126 *buf
++ = hex
[val
>> 4];
127 *buf
++ = hex
[val
& 0xf];
134 static void fill_sha1_path(char *pathbuf
, const unsigned char *sha1
)
137 for (i
= 0; i
< 20; i
++) {
138 static char hex
[] = "0123456789abcdef";
139 unsigned int val
= sha1
[i
];
140 char *pos
= pathbuf
+ i
*2 + (i
> 0);
141 *pos
++ = hex
[val
>> 4];
142 *pos
= hex
[val
& 0xf];
147 * NOTE! This returns a statically allocated buffer, so you have to be
148 * careful about using it. Do a "xstrdup()" if you need to save the
151 * Also note that this returns the location for creating. Reading
152 * SHA1 file can happen from any alternate directory listed in the
153 * DB_ENVIRONMENT environment variable if it is not found in
154 * the primary object database.
156 char *sha1_file_name(const unsigned char *sha1
)
158 static char *name
, *base
;
161 const char *sha1_file_directory
= get_object_directory();
162 int len
= strlen(sha1_file_directory
);
163 base
= xmalloc(len
+ 60);
164 memcpy(base
, sha1_file_directory
, len
);
165 memset(base
+len
, 0, 60);
168 name
= base
+ len
+ 1;
170 fill_sha1_path(name
, sha1
);
174 char *sha1_pack_name(const unsigned char *sha1
)
176 static const char hex
[] = "0123456789abcdef";
177 static char *name
, *base
, *buf
;
181 const char *sha1_file_directory
= get_object_directory();
182 int len
= strlen(sha1_file_directory
);
183 base
= xmalloc(len
+ 60);
184 sprintf(base
, "%s/pack/pack-1234567890123456789012345678901234567890.pack", sha1_file_directory
);
185 name
= base
+ len
+ 11;
190 for (i
= 0; i
< 20; i
++) {
191 unsigned int val
= *sha1
++;
192 *buf
++ = hex
[val
>> 4];
193 *buf
++ = hex
[val
& 0xf];
199 char *sha1_pack_index_name(const unsigned char *sha1
)
201 static const char hex
[] = "0123456789abcdef";
202 static char *name
, *base
, *buf
;
206 const char *sha1_file_directory
= get_object_directory();
207 int len
= strlen(sha1_file_directory
);
208 base
= xmalloc(len
+ 60);
209 sprintf(base
, "%s/pack/pack-1234567890123456789012345678901234567890.idx", sha1_file_directory
);
210 name
= base
+ len
+ 11;
215 for (i
= 0; i
< 20; i
++) {
216 unsigned int val
= *sha1
++;
217 *buf
++ = hex
[val
>> 4];
218 *buf
++ = hex
[val
& 0xf];
224 struct alternate_object_database
*alt_odb_list
;
225 static struct alternate_object_database
**alt_odb_tail
;
227 static void read_info_alternates(const char * alternates
, int depth
);
230 * Prepare alternate object database registry.
232 * The variable alt_odb_list points at the list of struct
233 * alternate_object_database. The elements on this list come from
234 * non-empty elements from colon separated ALTERNATE_DB_ENVIRONMENT
235 * environment variable, and $GIT_OBJECT_DIRECTORY/info/alternates,
236 * whose contents is similar to that environment variable but can be
237 * LF separated. Its base points at a statically allocated buffer that
238 * contains "/the/directory/corresponding/to/.git/objects/...", while
239 * its name points just after the slash at the end of ".git/objects/"
240 * in the example above, and has enough space to hold 40-byte hex
241 * SHA1, an extra slash for the first level indirection, and the
244 static int link_alt_odb_entry(const char * entry
, int len
, const char * relative_base
, int depth
)
247 const char *objdir
= get_object_directory();
248 struct alternate_object_database
*ent
;
249 struct alternate_object_database
*alt
;
250 /* 43 = 40-byte + 2 '/' + terminating NUL */
252 int entlen
= pfxlen
+ 43;
255 if (*entry
!= '/' && relative_base
) {
256 /* Relative alt-odb */
258 base_len
= strlen(relative_base
) + 1;
262 ent
= xmalloc(sizeof(*ent
) + entlen
);
264 if (*entry
!= '/' && relative_base
) {
265 memcpy(ent
->base
, relative_base
, base_len
- 1);
266 ent
->base
[base_len
- 1] = '/';
267 memcpy(ent
->base
+ base_len
, entry
, len
);
270 memcpy(ent
->base
, entry
, pfxlen
);
272 ent
->name
= ent
->base
+ pfxlen
+ 1;
273 ent
->base
[pfxlen
+ 3] = '/';
274 ent
->base
[pfxlen
] = ent
->base
[entlen
-1] = 0;
276 /* Detect cases where alternate disappeared */
277 if (stat(ent
->base
, &st
) || !S_ISDIR(st
.st_mode
)) {
278 error("object directory %s does not exist; "
279 "check .git/objects/info/alternates.",
285 /* Prevent the common mistake of listing the same
286 * thing twice, or object directory itself.
288 for (alt
= alt_odb_list
; alt
; alt
= alt
->next
) {
289 if (!memcmp(ent
->base
, alt
->base
, pfxlen
)) {
294 if (!memcmp(ent
->base
, objdir
, pfxlen
)) {
299 /* add the alternate entry */
301 alt_odb_tail
= &(ent
->next
);
304 /* recursively add alternates */
305 read_info_alternates(ent
->base
, depth
+ 1);
307 ent
->base
[pfxlen
] = '/';
312 static void link_alt_odb_entries(const char *alt
, const char *ep
, int sep
,
313 const char *relative_base
, int depth
)
315 const char *cp
, *last
;
318 error("%s: ignoring alternate object stores, nesting too deep.",
326 if (cp
< ep
&& *cp
== '#') {
327 while (cp
< ep
&& *cp
!= sep
)
332 while (cp
< ep
&& *cp
!= sep
)
335 if ((*last
!= '/') && depth
) {
336 error("%s: ignoring relative alternate object store %s",
337 relative_base
, last
);
339 link_alt_odb_entry(last
, cp
- last
,
340 relative_base
, depth
);
343 while (cp
< ep
&& *cp
== sep
)
349 static void read_info_alternates(const char * relative_base
, int depth
)
356 sprintf(path
, "%s/info/alternates", relative_base
);
357 fd
= open(path
, O_RDONLY
);
360 if (fstat(fd
, &st
) || (st
.st_size
== 0)) {
364 map
= xmmap(NULL
, st
.st_size
, PROT_READ
, MAP_PRIVATE
, fd
, 0);
367 link_alt_odb_entries(map
, map
+ st
.st_size
, '\n', relative_base
, depth
);
369 munmap(map
, st
.st_size
);
372 void prepare_alt_odb(void)
376 alt
= getenv(ALTERNATE_DB_ENVIRONMENT
);
381 alt_odb_tail
= &alt_odb_list
;
382 link_alt_odb_entries(alt
, alt
+ strlen(alt
), ':', NULL
, 0);
384 read_info_alternates(get_object_directory(), 0);
387 static char *find_sha1_file(const unsigned char *sha1
, struct stat
*st
)
389 char *name
= sha1_file_name(sha1
);
390 struct alternate_object_database
*alt
;
395 for (alt
= alt_odb_list
; alt
; alt
= alt
->next
) {
397 fill_sha1_path(name
, sha1
);
398 if (!stat(alt
->base
, st
))
404 static unsigned int pack_used_ctr
;
405 static unsigned int pack_mmap_calls
;
406 static unsigned int peak_pack_open_windows
;
407 static unsigned int pack_open_windows
;
408 static size_t peak_pack_mapped
;
409 static size_t pack_mapped
;
410 struct packed_git
*packed_git
;
415 "pack_report: getpagesize() = %10" SZ_FMT
"\n"
416 "pack_report: core.packedGitWindowSize = %10" SZ_FMT
"\n"
417 "pack_report: core.packedGitLimit = %10" SZ_FMT
"\n",
418 (size_t) getpagesize(),
419 packed_git_window_size
,
422 "pack_report: pack_used_ctr = %10u\n"
423 "pack_report: pack_mmap_calls = %10u\n"
424 "pack_report: pack_open_windows = %10u / %10u\n"
425 "pack_report: pack_mapped = "
426 "%10" SZ_FMT
" / %10" SZ_FMT
"\n",
429 pack_open_windows
, peak_pack_open_windows
,
430 pack_mapped
, peak_pack_mapped
);
433 static int check_packed_git_idx(const char *path
, unsigned long *idx_size_
,
438 unsigned long idx_size
;
440 int fd
= open(path
, O_RDONLY
);
444 if (fstat(fd
, &st
)) {
448 idx_size
= st
.st_size
;
449 idx_map
= xmmap(NULL
, idx_size
, PROT_READ
, MAP_PRIVATE
, fd
, 0);
454 *idx_size_
= idx_size
;
456 /* check index map */
457 if (idx_size
< 4*256 + 20 + 20)
458 return error("index file %s is too small", path
);
460 /* a future index format would start with this, as older git
461 * binaries would fail the non-monotonic index check below.
462 * give a nicer warning to the user if we can.
464 if (index
[0] == htonl(PACK_IDX_SIGNATURE
))
465 return error("index file %s is a newer version"
466 " and is not supported by this binary"
467 " (try upgrading GIT to a newer version)",
471 for (i
= 0; i
< 256; i
++) {
472 unsigned int n
= ntohl(index
[i
]);
474 return error("non-monotonic index %s", path
);
480 * - 256 index entries 4 bytes each
481 * - 24-byte entries * nr (20-byte sha1 + 4-byte offset)
482 * - 20-byte SHA1 of the packfile
483 * - 20-byte SHA1 file checksum
485 if (idx_size
!= 4*256 + nr
* 24 + 20 + 20)
486 return error("wrong index file size in %s", path
);
491 static void scan_windows(struct packed_git
*p
,
492 struct packed_git
**lru_p
,
493 struct pack_window
**lru_w
,
494 struct pack_window
**lru_l
)
496 struct pack_window
*w
, *w_l
;
498 for (w_l
= NULL
, w
= p
->windows
; w
; w
= w
->next
) {
500 if (!*lru_w
|| w
->last_used
< (*lru_w
)->last_used
) {
510 static int unuse_one_window(struct packed_git
*current
)
512 struct packed_git
*p
, *lru_p
= NULL
;
513 struct pack_window
*lru_w
= NULL
, *lru_l
= NULL
;
516 scan_windows(current
, &lru_p
, &lru_w
, &lru_l
);
517 for (p
= packed_git
; p
; p
= p
->next
)
518 scan_windows(p
, &lru_p
, &lru_w
, &lru_l
);
520 munmap(lru_w
->base
, lru_w
->len
);
521 pack_mapped
-= lru_w
->len
;
523 lru_l
->next
= lru_w
->next
;
525 lru_p
->windows
= lru_w
->next
;
526 if (!lru_p
->windows
&& lru_p
!= current
) {
527 close(lru_p
->pack_fd
);
538 void release_pack_memory(size_t need
)
540 size_t cur
= pack_mapped
;
541 while (need
>= (cur
- pack_mapped
) && unuse_one_window(NULL
))
545 void unuse_pack(struct pack_window
**w_cursor
)
547 struct pack_window
*w
= *w_cursor
;
555 * Do not call this directly as this leaks p->pack_fd on error return;
556 * call open_packed_git() instead.
558 static int open_packed_git_1(struct packed_git
*p
)
561 struct pack_header hdr
;
562 unsigned char sha1
[20];
563 unsigned char *idx_sha1
;
566 p
->pack_fd
= open(p
->pack_name
, O_RDONLY
);
567 if (p
->pack_fd
< 0 || fstat(p
->pack_fd
, &st
))
570 /* If we created the struct before we had the pack we lack size. */
572 if (!S_ISREG(st
.st_mode
))
573 return error("packfile %s not a regular file", p
->pack_name
);
574 p
->pack_size
= st
.st_size
;
575 } else if (p
->pack_size
!= st
.st_size
)
576 return error("packfile %s size changed", p
->pack_name
);
578 /* We leave these file descriptors open with sliding mmap;
579 * there is no point keeping them open across exec(), though.
581 fd_flag
= fcntl(p
->pack_fd
, F_GETFD
, 0);
583 return error("cannot determine file descriptor flags");
584 fd_flag
|= FD_CLOEXEC
;
585 if (fcntl(p
->pack_fd
, F_SETFD
, fd_flag
) == -1)
586 return error("cannot set FD_CLOEXEC");
588 /* Verify we recognize this pack file format. */
589 if (read_in_full(p
->pack_fd
, &hdr
, sizeof(hdr
)) != sizeof(hdr
))
590 return error("file %s is far too short to be a packfile", p
->pack_name
);
591 if (hdr
.hdr_signature
!= htonl(PACK_SIGNATURE
))
592 return error("file %s is not a GIT packfile", p
->pack_name
);
593 if (!pack_version_ok(hdr
.hdr_version
))
594 return error("packfile %s is version %u and not supported"
595 " (try upgrading GIT to a newer version)",
596 p
->pack_name
, ntohl(hdr
.hdr_version
));
598 /* Verify the pack matches its index. */
599 if (num_packed_objects(p
) != ntohl(hdr
.hdr_entries
))
600 return error("packfile %s claims to have %u objects"
601 " while index size indicates %u objects",
602 p
->pack_name
, ntohl(hdr
.hdr_entries
),
603 num_packed_objects(p
));
604 if (lseek(p
->pack_fd
, p
->pack_size
- sizeof(sha1
), SEEK_SET
) == -1)
605 return error("end of packfile %s is unavailable", p
->pack_name
);
606 if (read_in_full(p
->pack_fd
, sha1
, sizeof(sha1
)) != sizeof(sha1
))
607 return error("packfile %s signature is unavailable", p
->pack_name
);
608 idx_sha1
= ((unsigned char *)p
->index_base
) + p
->index_size
- 40;
609 if (hashcmp(sha1
, idx_sha1
))
610 return error("packfile %s does not match index", p
->pack_name
);
614 static int open_packed_git(struct packed_git
*p
)
616 if (!open_packed_git_1(p
))
618 if (p
->pack_fd
!= -1) {
625 static int in_window(struct pack_window
*win
, unsigned long offset
)
627 /* We must promise at least 20 bytes (one hash) after the
628 * offset is available from this window, otherwise the offset
629 * is not actually in this window and a different window (which
630 * has that one hash excess) must be used. This is to support
631 * the object header and delta base parsing routines below.
633 off_t win_off
= win
->offset
;
634 return win_off
<= offset
635 && (offset
+ 20) <= (win_off
+ win
->len
);
638 unsigned char* use_pack(struct packed_git
*p
,
639 struct pack_window
**w_cursor
,
640 unsigned long offset
,
643 struct pack_window
*win
= *w_cursor
;
645 if (p
->pack_fd
== -1 && open_packed_git(p
))
646 die("packfile %s cannot be accessed", p
->pack_name
);
648 /* Since packfiles end in a hash of their content and its
649 * pointless to ask for an offset into the middle of that
650 * hash, and the in_window function above wouldn't match
651 * don't allow an offset too close to the end of the file.
653 if (offset
> (p
->pack_size
- 20))
654 die("offset beyond end of packfile (truncated pack?)");
656 if (!win
|| !in_window(win
, offset
)) {
659 for (win
= p
->windows
; win
; win
= win
->next
) {
660 if (in_window(win
, offset
))
664 size_t window_align
= packed_git_window_size
/ 2;
665 win
= xcalloc(1, sizeof(*win
));
666 win
->offset
= (offset
/ window_align
) * window_align
;
667 win
->len
= p
->pack_size
- win
->offset
;
668 if (win
->len
> packed_git_window_size
)
669 win
->len
= packed_git_window_size
;
670 pack_mapped
+= win
->len
;
671 while (packed_git_limit
< pack_mapped
672 && unuse_one_window(p
))
674 win
->base
= xmmap(NULL
, win
->len
,
675 PROT_READ
, MAP_PRIVATE
,
676 p
->pack_fd
, win
->offset
);
677 if (win
->base
== MAP_FAILED
)
678 die("packfile %s cannot be mapped: %s",
683 if (pack_mapped
> peak_pack_mapped
)
684 peak_pack_mapped
= pack_mapped
;
685 if (pack_open_windows
> peak_pack_open_windows
)
686 peak_pack_open_windows
= pack_open_windows
;
687 win
->next
= p
->windows
;
691 if (win
!= *w_cursor
) {
692 win
->last_used
= pack_used_ctr
++;
696 offset
-= win
->offset
;
698 *left
= win
->len
- offset
;
699 return win
->base
+ offset
;
702 struct packed_git
*add_packed_git(char *path
, int path_len
, int local
)
705 struct packed_git
*p
;
706 unsigned long idx_size
;
708 unsigned char sha1
[20];
710 if (check_packed_git_idx(path
, &idx_size
, &idx_map
))
713 /* do we have a corresponding .pack file? */
714 strcpy(path
+ path_len
- 4, ".pack");
715 if (stat(path
, &st
) || !S_ISREG(st
.st_mode
)) {
716 munmap(idx_map
, idx_size
);
719 /* ok, it looks sane as far as we can check without
720 * actually mapping the pack file.
722 p
= xmalloc(sizeof(*p
) + path_len
+ 2);
723 strcpy(p
->pack_name
, path
);
724 p
->index_size
= idx_size
;
725 p
->pack_size
= st
.st_size
;
726 p
->index_base
= idx_map
;
730 p
->pack_local
= local
;
731 if ((path_len
> 44) && !get_sha1_hex(path
+ path_len
- 44, sha1
))
732 hashcpy(p
->sha1
, sha1
);
736 struct packed_git
*parse_pack_index(unsigned char *sha1
)
738 char *path
= sha1_pack_index_name(sha1
);
739 return parse_pack_index_file(sha1
, path
);
742 struct packed_git
*parse_pack_index_file(const unsigned char *sha1
, char *idx_path
)
744 struct packed_git
*p
;
745 unsigned long idx_size
;
749 if (check_packed_git_idx(idx_path
, &idx_size
, &idx_map
))
752 path
= sha1_pack_name(sha1
);
754 p
= xmalloc(sizeof(*p
) + strlen(path
) + 2);
755 strcpy(p
->pack_name
, path
);
756 p
->index_size
= idx_size
;
758 p
->index_base
= idx_map
;
762 hashcpy(p
->sha1
, sha1
);
766 void install_packed_git(struct packed_git
*pack
)
768 pack
->next
= packed_git
;
772 static void prepare_packed_git_one(char *objdir
, int local
)
779 sprintf(path
, "%s/pack", objdir
);
784 error("unable to open object pack directory: %s: %s",
785 path
, strerror(errno
));
789 while ((de
= readdir(dir
)) != NULL
) {
790 int namelen
= strlen(de
->d_name
);
791 struct packed_git
*p
;
793 if (!has_extension(de
->d_name
, ".idx"))
796 /* Don't reopen a pack we already have. */
797 strcpy(path
+ len
, de
->d_name
);
798 for (p
= packed_git
; p
; p
= p
->next
) {
799 if (!memcmp(path
, p
->pack_name
, len
+ namelen
- 4))
804 /* See if it really is a valid .idx file with corresponding
805 * .pack file that we can map.
807 p
= add_packed_git(path
, len
+ namelen
, local
);
810 install_packed_git(p
);
815 static int prepare_packed_git_run_once
= 0;
816 void prepare_packed_git(void)
818 struct alternate_object_database
*alt
;
820 if (prepare_packed_git_run_once
)
822 prepare_packed_git_one(get_object_directory(), 1);
824 for (alt
= alt_odb_list
; alt
; alt
= alt
->next
) {
826 prepare_packed_git_one(alt
->base
, 0);
829 prepare_packed_git_run_once
= 1;
832 void reprepare_packed_git(void)
834 prepare_packed_git_run_once
= 0;
835 prepare_packed_git();
838 int check_sha1_signature(const unsigned char *sha1
, void *map
, unsigned long size
, const char *type
)
840 unsigned char real_sha1
[20];
841 hash_sha1_file(map
, size
, type
, real_sha1
);
842 return hashcmp(sha1
, real_sha1
) ? -1 : 0;
845 void *map_sha1_file(const unsigned char *sha1
, unsigned long *size
)
850 char *filename
= find_sha1_file(sha1
, &st
);
856 fd
= open(filename
, O_RDONLY
| sha1_file_open_flag
);
858 /* See if it works without O_NOATIME */
859 switch (sha1_file_open_flag
) {
861 fd
= open(filename
, O_RDONLY
);
869 /* If it failed once, it will probably fail again.
870 * Stop using O_NOATIME
872 sha1_file_open_flag
= 0;
874 map
= xmmap(NULL
, st
.st_size
, PROT_READ
, MAP_PRIVATE
, fd
, 0);
880 int legacy_loose_object(unsigned char *map
)
885 * Is it a zlib-compressed buffer? If so, the first byte
886 * must be 0x78 (15-bit window size, deflated), and the
887 * first 16-bit word is evenly divisible by 31
889 word
= (map
[0] << 8) + map
[1];
890 if (map
[0] == 0x78 && !(word
% 31))
896 unsigned long unpack_object_header_gently(const unsigned char *buf
, unsigned long len
, enum object_type
*type
, unsigned long *sizep
)
901 unsigned long used
= 0;
904 *type
= (c
>> 4) & 7;
910 if (sizeof(long) * 8 <= shift
)
913 size
+= (c
& 0x7f) << shift
;
920 static int unpack_sha1_header(z_stream
*stream
, unsigned char *map
, unsigned long mapsize
, void *buffer
, unsigned long bufsiz
)
922 unsigned long size
, used
;
923 static const char valid_loose_object_type
[8] = {
925 1, 1, 1, 1, /* "commit", "tree", "blob", "tag" */
926 0, /* "delta" and others are invalid in a loose object */
928 enum object_type type
;
930 /* Get the data stream */
931 memset(stream
, 0, sizeof(*stream
));
932 stream
->next_in
= map
;
933 stream
->avail_in
= mapsize
;
934 stream
->next_out
= buffer
;
935 stream
->avail_out
= bufsiz
;
937 if (legacy_loose_object(map
)) {
939 return inflate(stream
, 0);
942 used
= unpack_object_header_gently(map
, mapsize
, &type
, &size
);
943 if (!used
|| !valid_loose_object_type
[type
])
948 /* Set up the stream for the rest.. */
949 stream
->next_in
= map
;
950 stream
->avail_in
= mapsize
;
953 /* And generate the fake traditional header */
954 stream
->total_out
= 1 + snprintf(buffer
, bufsiz
, "%s %lu",
955 typename(type
), size
);
959 static void *unpack_sha1_rest(z_stream
*stream
, void *buffer
, unsigned long size
)
961 int bytes
= strlen(buffer
) + 1;
962 unsigned char *buf
= xmalloc(1+size
);
965 n
= stream
->total_out
- bytes
;
968 memcpy(buf
, (char *) buffer
+ bytes
, n
);
971 stream
->next_out
= buf
+ bytes
;
972 stream
->avail_out
= size
- bytes
;
973 while (inflate(stream
, Z_FINISH
) == Z_OK
)
982 * We used to just use "sscanf()", but that's actually way
983 * too permissive for what we want to check. So do an anal
984 * object header parse by hand.
986 static int parse_sha1_header(char *hdr
, char *type
, unsigned long *sizep
)
992 * The type can be at most ten bytes (including the
993 * terminating '\0' that we add), and is followed by
1008 * The length must follow immediately, and be in canonical
1009 * decimal format (ie "010" is not valid).
1011 size
= *hdr
++ - '0';
1016 unsigned long c
= *hdr
- '0';
1020 size
= size
* 10 + c
;
1026 * The length must be followed by a zero byte
1028 return *hdr
? -1 : 0;
1031 void * unpack_sha1_file(void *map
, unsigned long mapsize
, char *type
, unsigned long *size
)
1037 ret
= unpack_sha1_header(&stream
, map
, mapsize
, hdr
, sizeof(hdr
));
1038 if (ret
< Z_OK
|| parse_sha1_header(hdr
, type
, size
) < 0)
1041 return unpack_sha1_rest(&stream
, hdr
, *size
);
1044 static unsigned long get_delta_base(struct packed_git
*p
,
1045 struct pack_window
**w_curs
,
1046 unsigned long *curpos
,
1047 enum object_type kind
,
1048 unsigned long delta_obj_offset
)
1050 unsigned char *base_info
= use_pack(p
, w_curs
, *curpos
, NULL
);
1051 unsigned long base_offset
;
1053 /* use_pack() assured us we have [base_info, base_info + 20)
1054 * as a range that we can look at without walking off the
1055 * end of the mapped window. Its actually the hash size
1056 * that is assured. An OFS_DELTA longer than the hash size
1057 * is stupid, as then a REF_DELTA would be smaller to store.
1059 if (kind
== OBJ_OFS_DELTA
) {
1061 unsigned char c
= base_info
[used
++];
1062 base_offset
= c
& 127;
1065 if (!base_offset
|| base_offset
& ~(~0UL >> 7))
1066 die("offset value overflow for delta base object");
1067 c
= base_info
[used
++];
1068 base_offset
= (base_offset
<< 7) + (c
& 127);
1070 base_offset
= delta_obj_offset
- base_offset
;
1071 if (base_offset
>= delta_obj_offset
)
1072 die("delta base offset out of bound");
1074 } else if (kind
== OBJ_REF_DELTA
) {
1075 /* The base entry _must_ be in the same pack */
1076 base_offset
= find_pack_entry_one(base_info
, p
);
1078 die("failed to find delta-pack base object %s",
1079 sha1_to_hex(base_info
));
1082 die("I am totally screwed");
1086 /* forward declaration for a mutually recursive function */
1087 static int packed_object_info(struct packed_git
*p
, unsigned long offset
,
1088 char *type
, unsigned long *sizep
);
1090 static int packed_delta_info(struct packed_git
*p
,
1091 struct pack_window
**w_curs
,
1092 unsigned long curpos
,
1093 enum object_type kind
,
1094 unsigned long obj_offset
,
1096 unsigned long *sizep
)
1098 unsigned long base_offset
;
1100 base_offset
= get_delta_base(p
, w_curs
, &curpos
, kind
, obj_offset
);
1102 /* We choose to only get the type of the base object and
1103 * ignore potentially corrupt pack file that expects the delta
1104 * based on a base with a wrong size. This saves tons of
1107 if (packed_object_info(p
, base_offset
, type
, NULL
))
1108 die("cannot get info for delta-pack base");
1111 const unsigned char *data
;
1112 unsigned char delta_head
[20], *in
;
1116 memset(&stream
, 0, sizeof(stream
));
1117 stream
.next_out
= delta_head
;
1118 stream
.avail_out
= sizeof(delta_head
);
1120 inflateInit(&stream
);
1122 in
= use_pack(p
, w_curs
, curpos
, &stream
.avail_in
);
1123 stream
.next_in
= in
;
1124 st
= inflate(&stream
, Z_FINISH
);
1125 curpos
+= stream
.next_in
- in
;
1126 } while ((st
== Z_OK
|| st
== Z_BUF_ERROR
)
1127 && stream
.total_out
< sizeof(delta_head
));
1128 inflateEnd(&stream
);
1129 if ((st
!= Z_STREAM_END
) &&
1130 stream
.total_out
!= sizeof(delta_head
))
1131 die("delta data unpack-initial failed");
1133 /* Examine the initial part of the delta to figure out
1138 /* ignore base size */
1139 get_delta_hdr_size(&data
, delta_head
+sizeof(delta_head
));
1141 /* Read the result size */
1142 *sizep
= get_delta_hdr_size(&data
, delta_head
+sizeof(delta_head
));
1147 static int unpack_object_header(struct packed_git
*p
,
1148 struct pack_window
**w_curs
,
1149 unsigned long *curpos
,
1150 unsigned long *sizep
)
1152 unsigned char *base
;
1155 enum object_type type
;
1157 /* use_pack() assures us we have [base, base + 20) available
1158 * as a range that we can look at at. (Its actually the hash
1159 * size that is assured.) With our object header encoding
1160 * the maximum deflated object size is 2^137, which is just
1161 * insane, so we know won't exceed what we have been given.
1163 base
= use_pack(p
, w_curs
, *curpos
, &left
);
1164 used
= unpack_object_header_gently(base
, left
, &type
, sizep
);
1166 die("object offset outside of pack file");
1172 void packed_object_info_detail(struct packed_git
*p
,
1173 unsigned long obj_offset
,
1175 unsigned long *size
,
1176 unsigned long *store_size
,
1177 unsigned int *delta_chain_length
,
1178 unsigned char *base_sha1
)
1180 struct pack_window
*w_curs
= NULL
;
1181 unsigned long curpos
, dummy
;
1182 unsigned char *next_sha1
;
1183 enum object_type kind
;
1185 *delta_chain_length
= 0;
1186 curpos
= obj_offset
;
1187 kind
= unpack_object_header(p
, &w_curs
, &curpos
, size
);
1192 die("pack %s contains unknown object type %d",
1193 p
->pack_name
, kind
);
1198 strcpy(type
, typename(kind
));
1199 *store_size
= 0; /* notyet */
1200 unuse_pack(&w_curs
);
1203 obj_offset
= get_delta_base(p
, &w_curs
, &curpos
, kind
, obj_offset
);
1204 if (*delta_chain_length
== 0) {
1205 /* TODO: find base_sha1 as pointed by curpos */
1209 next_sha1
= use_pack(p
, &w_curs
, curpos
, NULL
);
1210 if (*delta_chain_length
== 0)
1211 hashcpy(base_sha1
, next_sha1
);
1212 obj_offset
= find_pack_entry_one(next_sha1
, p
);
1215 (*delta_chain_length
)++;
1216 curpos
= obj_offset
;
1217 kind
= unpack_object_header(p
, &w_curs
, &curpos
, &dummy
);
1221 static int packed_object_info(struct packed_git
*p
, unsigned long obj_offset
,
1222 char *type
, unsigned long *sizep
)
1224 struct pack_window
*w_curs
= NULL
;
1225 unsigned long size
, curpos
= obj_offset
;
1226 enum object_type kind
;
1228 kind
= unpack_object_header(p
, &w_curs
, &curpos
, &size
);
1233 packed_delta_info(p
, &w_curs
, curpos
, kind
,
1234 obj_offset
, type
, sizep
);
1240 strcpy(type
, typename(kind
));
1245 die("pack %s contains unknown object type %d",
1246 p
->pack_name
, kind
);
1248 unuse_pack(&w_curs
);
1252 static void *unpack_compressed_entry(struct packed_git
*p
,
1253 struct pack_window
**w_curs
,
1254 unsigned long curpos
,
1259 unsigned char *buffer
, *in
;
1261 buffer
= xmalloc(size
+ 1);
1263 memset(&stream
, 0, sizeof(stream
));
1264 stream
.next_out
= buffer
;
1265 stream
.avail_out
= size
;
1267 inflateInit(&stream
);
1269 in
= use_pack(p
, w_curs
, curpos
, &stream
.avail_in
);
1270 stream
.next_in
= in
;
1271 st
= inflate(&stream
, Z_FINISH
);
1272 curpos
+= stream
.next_in
- in
;
1273 } while (st
== Z_OK
|| st
== Z_BUF_ERROR
);
1274 inflateEnd(&stream
);
1275 if ((st
!= Z_STREAM_END
) || stream
.total_out
!= size
) {
1283 static void *unpack_delta_entry(struct packed_git
*p
,
1284 struct pack_window
**w_curs
,
1285 unsigned long curpos
,
1286 unsigned long delta_size
,
1287 enum object_type kind
,
1288 unsigned long obj_offset
,
1290 unsigned long *sizep
)
1292 void *delta_data
, *result
, *base
;
1293 unsigned long result_size
, base_size
, base_offset
;
1295 base_offset
= get_delta_base(p
, w_curs
, &curpos
, kind
, obj_offset
);
1296 base
= unpack_entry(p
, base_offset
, type
, &base_size
);
1298 die("failed to read delta base object at %lu from %s",
1299 base_offset
, p
->pack_name
);
1301 delta_data
= unpack_compressed_entry(p
, w_curs
, curpos
, delta_size
);
1302 result
= patch_delta(base
, base_size
,
1303 delta_data
, delta_size
,
1306 die("failed to apply delta");
1309 *sizep
= result_size
;
1313 void *unpack_entry(struct packed_git
*p
, unsigned long obj_offset
,
1314 char *type
, unsigned long *sizep
)
1316 struct pack_window
*w_curs
= NULL
;
1317 unsigned long size
, curpos
= obj_offset
;
1318 enum object_type kind
;
1321 kind
= unpack_object_header(p
, &w_curs
, &curpos
, &size
);
1325 retval
= unpack_delta_entry(p
, &w_curs
, curpos
, size
,
1326 kind
, obj_offset
, type
, sizep
);
1332 strcpy(type
, typename(kind
));
1334 retval
= unpack_compressed_entry(p
, &w_curs
, curpos
, size
);
1337 die("unknown object type %i in %s", kind
, p
->pack_name
);
1339 unuse_pack(&w_curs
);
1343 int num_packed_objects(const struct packed_git
*p
)
1345 /* See check_packed_git_idx() */
1346 return (p
->index_size
- 20 - 20 - 4*256) / 24;
1349 int nth_packed_object_sha1(const struct packed_git
*p
, int n
,
1350 unsigned char* sha1
)
1352 void *index
= p
->index_base
+ 256;
1353 if (n
< 0 || num_packed_objects(p
) <= n
)
1355 hashcpy(sha1
, (unsigned char *) index
+ (24 * n
) + 4);
1359 unsigned long find_pack_entry_one(const unsigned char *sha1
,
1360 struct packed_git
*p
)
1362 uint32_t *level1_ofs
= p
->index_base
;
1363 int hi
= ntohl(level1_ofs
[*sha1
]);
1364 int lo
= ((*sha1
== 0x0) ? 0 : ntohl(level1_ofs
[*sha1
- 1]));
1365 void *index
= p
->index_base
+ 256;
1368 int mi
= (lo
+ hi
) / 2;
1369 int cmp
= hashcmp((unsigned char *)index
+ (24 * mi
) + 4, sha1
);
1371 return ntohl(*((uint32_t *)((char *)index
+ (24 * mi
))));
1380 static int matches_pack_name(struct packed_git
*p
, const char *ig
)
1382 const char *last_c
, *c
;
1384 if (!strcmp(p
->pack_name
, ig
))
1387 for (c
= p
->pack_name
, last_c
= c
; *c
;)
1392 if (!strcmp(last_c
, ig
))
1398 static int find_pack_entry(const unsigned char *sha1
, struct pack_entry
*e
, const char **ignore_packed
)
1400 struct packed_git
*p
;
1401 unsigned long offset
;
1403 prepare_packed_git();
1405 for (p
= packed_git
; p
; p
= p
->next
) {
1406 if (ignore_packed
) {
1408 for (ig
= ignore_packed
; *ig
; ig
++)
1409 if (!matches_pack_name(p
, *ig
))
1414 offset
= find_pack_entry_one(sha1
, p
);
1417 * We are about to tell the caller where they can
1418 * locate the requested object. We better make
1419 * sure the packfile is still here and can be
1420 * accessed before supplying that answer, as
1421 * it may have been deleted since the index
1424 if (p
->pack_fd
== -1 && open_packed_git(p
)) {
1425 error("packfile %s cannot be accessed", p
->pack_name
);
1430 hashcpy(e
->sha1
, sha1
);
1437 struct packed_git
*find_sha1_pack(const unsigned char *sha1
,
1438 struct packed_git
*packs
)
1440 struct packed_git
*p
;
1442 for (p
= packs
; p
; p
= p
->next
) {
1443 if (find_pack_entry_one(sha1
, p
))
1450 static int sha1_loose_object_info(const unsigned char *sha1
, char *type
, unsigned long *sizep
)
1453 unsigned long mapsize
, size
;
1458 map
= map_sha1_file(sha1
, &mapsize
);
1460 return error("unable to find %s", sha1_to_hex(sha1
));
1461 if (unpack_sha1_header(&stream
, map
, mapsize
, hdr
, sizeof(hdr
)) < 0)
1462 status
= error("unable to unpack %s header",
1464 else if (parse_sha1_header(hdr
, type
, &size
) < 0)
1465 status
= error("unable to parse %s header", sha1_to_hex(sha1
));
1471 inflateEnd(&stream
);
1472 munmap(map
, mapsize
);
1476 int sha1_object_info(const unsigned char *sha1
, char *type
, unsigned long *sizep
)
1478 struct pack_entry e
;
1480 if (!find_pack_entry(sha1
, &e
, NULL
)) {
1481 reprepare_packed_git();
1482 if (!find_pack_entry(sha1
, &e
, NULL
))
1483 return sha1_loose_object_info(sha1
, type
, sizep
);
1485 return packed_object_info(e
.p
, e
.offset
, type
, sizep
);
1488 static void *read_packed_sha1(const unsigned char *sha1
, char *type
, unsigned long *size
)
1490 struct pack_entry e
;
1492 if (!find_pack_entry(sha1
, &e
, NULL
))
1495 return unpack_entry(e
.p
, e
.offset
, type
, size
);
1499 * This is meant to hold a *small* number of objects that you would
1500 * want read_sha1_file() to be able to return, but yet you do not want
1501 * to write them into the object store (e.g. a browse-only
1504 static struct cached_object
{
1505 unsigned char sha1
[20];
1510 static int cached_object_nr
, cached_object_alloc
;
1512 static struct cached_object
*find_cached_object(const unsigned char *sha1
)
1515 struct cached_object
*co
= cached_objects
;
1517 for (i
= 0; i
< cached_object_nr
; i
++, co
++) {
1518 if (!hashcmp(co
->sha1
, sha1
))
1524 int pretend_sha1_file(void *buf
, unsigned long len
, const char *type
, unsigned char *sha1
)
1526 struct cached_object
*co
;
1528 hash_sha1_file(buf
, len
, type
, sha1
);
1529 if (has_sha1_file(sha1
) || find_cached_object(sha1
))
1531 if (cached_object_alloc
<= cached_object_nr
) {
1532 cached_object_alloc
= alloc_nr(cached_object_alloc
);
1533 cached_objects
= xrealloc(cached_objects
,
1534 sizeof(*cached_objects
) *
1535 cached_object_alloc
);
1537 co
= &cached_objects
[cached_object_nr
++];
1539 co
->type
= strdup(type
);
1540 co
->buf
= xmalloc(len
);
1541 memcpy(co
->buf
, buf
, len
);
1542 hashcpy(co
->sha1
, sha1
);
1546 void *read_sha1_file(const unsigned char *sha1
, char *type
, unsigned long *size
)
1548 unsigned long mapsize
;
1550 struct cached_object
*co
;
1552 co
= find_cached_object(sha1
);
1554 buf
= xmalloc(co
->size
+ 1);
1555 memcpy(buf
, co
->buf
, co
->size
);
1556 ((char*)buf
)[co
->size
] = 0;
1557 strcpy(type
, co
->type
);
1562 buf
= read_packed_sha1(sha1
, type
, size
);
1565 map
= map_sha1_file(sha1
, &mapsize
);
1567 buf
= unpack_sha1_file(map
, mapsize
, type
, size
);
1568 munmap(map
, mapsize
);
1571 reprepare_packed_git();
1572 return read_packed_sha1(sha1
, type
, size
);
1575 void *read_object_with_reference(const unsigned char *sha1
,
1576 const char *required_type
,
1577 unsigned long *size
,
1578 unsigned char *actual_sha1_return
)
1582 unsigned long isize
;
1583 unsigned char actual_sha1
[20];
1585 hashcpy(actual_sha1
, sha1
);
1587 int ref_length
= -1;
1588 const char *ref_type
= NULL
;
1590 buffer
= read_sha1_file(actual_sha1
, type
, &isize
);
1593 if (!strcmp(type
, required_type
)) {
1595 if (actual_sha1_return
)
1596 hashcpy(actual_sha1_return
, actual_sha1
);
1599 /* Handle references */
1600 else if (!strcmp(type
, commit_type
))
1602 else if (!strcmp(type
, tag_type
))
1603 ref_type
= "object ";
1608 ref_length
= strlen(ref_type
);
1610 if (memcmp(buffer
, ref_type
, ref_length
) ||
1611 get_sha1_hex((char *) buffer
+ ref_length
, actual_sha1
)) {
1616 /* Now we have the ID of the referred-to object in
1617 * actual_sha1. Check again. */
1621 static void write_sha1_file_prepare(void *buf
, unsigned long len
,
1622 const char *type
, unsigned char *sha1
,
1623 char *hdr
, int *hdrlen
)
1627 /* Generate the header */
1628 *hdrlen
= sprintf(hdr
, "%s %lu", type
, len
)+1;
1632 SHA1_Update(&c
, hdr
, *hdrlen
);
1633 SHA1_Update(&c
, buf
, len
);
1634 SHA1_Final(sha1
, &c
);
1638 * Link the tempfile to the final place, possibly creating the
1639 * last directory level as you do so.
1641 * Returns the errno on failure, 0 on success.
1643 static int link_temp_to_file(const char *tmpfile
, const char *filename
)
1648 if (!link(tmpfile
, filename
))
1652 * Try to mkdir the last path component if that failed.
1654 * Re-try the "link()" regardless of whether the mkdir
1655 * succeeds, since a race might mean that somebody
1659 dir
= strrchr(filename
, '/');
1662 if (!mkdir(filename
, 0777) && adjust_shared_perm(filename
)) {
1667 if (!link(tmpfile
, filename
))
1675 * Move the just written object into its final resting place
1677 int move_temp_to_file(const char *tmpfile
, const char *filename
)
1679 int ret
= link_temp_to_file(tmpfile
, filename
);
1682 * Coda hack - coda doesn't like cross-directory links,
1683 * so we fall back to a rename, which will mean that it
1684 * won't be able to check collisions, but that's not a
1687 * The same holds for FAT formatted media.
1689 * When this succeeds, we just return 0. We have nothing
1692 if (ret
&& ret
!= EEXIST
) {
1693 if (!rename(tmpfile
, filename
))
1699 if (ret
!= EEXIST
) {
1700 return error("unable to write sha1 filename %s: %s\n", filename
, strerror(ret
));
1702 /* FIXME!!! Collision check here ? */
1708 static int write_buffer(int fd
, const void *buf
, size_t len
)
1710 if (write_in_full(fd
, buf
, len
) < 0)
1711 return error("file write error (%s)", strerror(errno
));
1715 static int write_binary_header(unsigned char *hdr
, enum object_type type
, unsigned long len
)
1720 c
= (type
<< 4) | (len
& 15);
1733 static void setup_object_header(z_stream
*stream
, const char *type
, unsigned long len
)
1735 int obj_type
, hdrlen
;
1737 if (use_legacy_headers
) {
1738 while (deflate(stream
, 0) == Z_OK
)
1742 obj_type
= type_from_string(type
);
1743 hdrlen
= write_binary_header(stream
->next_out
, obj_type
, len
);
1744 stream
->total_out
= hdrlen
;
1745 stream
->next_out
+= hdrlen
;
1746 stream
->avail_out
-= hdrlen
;
1749 int hash_sha1_file(void *buf
, unsigned long len
, const char *type
,
1750 unsigned char *sha1
)
1754 write_sha1_file_prepare(buf
, len
, type
, sha1
, hdr
, &hdrlen
);
1758 int write_sha1_file(void *buf
, unsigned long len
, const char *type
, unsigned char *returnsha1
)
1761 unsigned char *compressed
;
1763 unsigned char sha1
[20];
1765 static char tmpfile
[PATH_MAX
];
1769 /* Normally if we have it in the pack then we do not bother writing
1770 * it out into .git/objects/??/?{38} file.
1772 write_sha1_file_prepare(buf
, len
, type
, sha1
, hdr
, &hdrlen
);
1773 filename
= sha1_file_name(sha1
);
1775 hashcpy(returnsha1
, sha1
);
1776 if (has_sha1_file(sha1
))
1778 fd
= open(filename
, O_RDONLY
);
1781 * FIXME!!! We might do collision checking here, but we'd
1782 * need to uncompress the old file and check it. Later.
1788 if (errno
!= ENOENT
) {
1789 return error("sha1 file %s: %s\n", filename
, strerror(errno
));
1792 snprintf(tmpfile
, sizeof(tmpfile
), "%s/obj_XXXXXX", get_object_directory());
1794 fd
= mkstemp(tmpfile
);
1797 return error("insufficient permission for adding an object to repository database %s\n", get_object_directory());
1799 return error("unable to create temporary sha1 filename %s: %s\n", tmpfile
, strerror(errno
));
1803 memset(&stream
, 0, sizeof(stream
));
1804 deflateInit(&stream
, zlib_compression_level
);
1805 size
= 8 + deflateBound(&stream
, len
+hdrlen
);
1806 compressed
= xmalloc(size
);
1809 stream
.next_out
= compressed
;
1810 stream
.avail_out
= size
;
1812 /* First header.. */
1813 stream
.next_in
= (unsigned char *)hdr
;
1814 stream
.avail_in
= hdrlen
;
1815 setup_object_header(&stream
, type
, len
);
1817 /* Then the data itself.. */
1818 stream
.next_in
= buf
;
1819 stream
.avail_in
= len
;
1820 while (deflate(&stream
, Z_FINISH
) == Z_OK
)
1822 deflateEnd(&stream
);
1823 size
= stream
.total_out
;
1825 if (write_buffer(fd
, compressed
, size
) < 0)
1826 die("unable to write sha1 file");
1831 return move_temp_to_file(tmpfile
, filename
);
1835 * We need to unpack and recompress the object for writing
1836 * it out to a different file.
1838 static void *repack_object(const unsigned char *sha1
, unsigned long *objsize
)
1842 unsigned char *unpacked
;
1849 /* need to unpack and recompress it by itself */
1850 unpacked
= read_packed_sha1(sha1
, type
, &len
);
1852 error("cannot read sha1_file for %s", sha1_to_hex(sha1
));
1854 hdrlen
= sprintf(hdr
, "%s %lu", type
, len
) + 1;
1857 memset(&stream
, 0, sizeof(stream
));
1858 deflateInit(&stream
, zlib_compression_level
);
1859 size
= deflateBound(&stream
, len
+ hdrlen
);
1860 buf
= xmalloc(size
);
1863 stream
.next_out
= buf
;
1864 stream
.avail_out
= size
;
1866 /* First header.. */
1867 stream
.next_in
= (void *)hdr
;
1868 stream
.avail_in
= hdrlen
;
1869 while (deflate(&stream
, 0) == Z_OK
)
1872 /* Then the data itself.. */
1873 stream
.next_in
= unpacked
;
1874 stream
.avail_in
= len
;
1875 while (deflate(&stream
, Z_FINISH
) == Z_OK
)
1877 deflateEnd(&stream
);
1880 *objsize
= stream
.total_out
;
1884 int write_sha1_to_fd(int fd
, const unsigned char *sha1
)
1887 unsigned long objsize
;
1888 void *buf
= map_sha1_file(sha1
, &objsize
);
1891 retval
= write_buffer(fd
, buf
, objsize
);
1892 munmap(buf
, objsize
);
1896 buf
= repack_object(sha1
, &objsize
);
1897 retval
= write_buffer(fd
, buf
, objsize
);
1902 int write_sha1_from_fd(const unsigned char *sha1
, int fd
, char *buffer
,
1903 size_t bufsize
, size_t *bufposn
)
1905 char tmpfile
[PATH_MAX
];
1908 unsigned char real_sha1
[20];
1909 unsigned char discard
[4096];
1913 snprintf(tmpfile
, sizeof(tmpfile
), "%s/obj_XXXXXX", get_object_directory());
1915 local
= mkstemp(tmpfile
);
1918 return error("insufficient permission for adding an object to repository database %s\n", get_object_directory());
1920 return error("unable to create temporary sha1 filename %s: %s\n", tmpfile
, strerror(errno
));
1923 memset(&stream
, 0, sizeof(stream
));
1925 inflateInit(&stream
);
1932 stream
.avail_in
= *bufposn
;
1933 stream
.next_in
= (unsigned char *) buffer
;
1935 stream
.next_out
= discard
;
1936 stream
.avail_out
= sizeof(discard
);
1937 ret
= inflate(&stream
, Z_SYNC_FLUSH
);
1938 SHA1_Update(&c
, discard
, sizeof(discard
) -
1940 } while (stream
.avail_in
&& ret
== Z_OK
);
1941 if (write_buffer(local
, buffer
, *bufposn
- stream
.avail_in
) < 0)
1942 die("unable to write sha1 file");
1943 memmove(buffer
, buffer
+ *bufposn
- stream
.avail_in
,
1945 *bufposn
= stream
.avail_in
;
1949 size
= xread(fd
, buffer
+ *bufposn
, bufsize
- *bufposn
);
1954 return error("Connection closed?");
1955 perror("Reading from connection");
1960 inflateEnd(&stream
);
1963 SHA1_Final(real_sha1
, &c
);
1964 if (ret
!= Z_STREAM_END
) {
1966 return error("File %s corrupted", sha1_to_hex(sha1
));
1968 if (hashcmp(sha1
, real_sha1
)) {
1970 return error("File %s has bad hash", sha1_to_hex(sha1
));
1973 return move_temp_to_file(tmpfile
, sha1_file_name(sha1
));
1976 int has_pack_index(const unsigned char *sha1
)
1979 if (stat(sha1_pack_index_name(sha1
), &st
))
1984 int has_pack_file(const unsigned char *sha1
)
1987 if (stat(sha1_pack_name(sha1
), &st
))
1992 int has_sha1_pack(const unsigned char *sha1
, const char **ignore_packed
)
1994 struct pack_entry e
;
1995 return find_pack_entry(sha1
, &e
, ignore_packed
);
1998 int has_sha1_file(const unsigned char *sha1
)
2001 struct pack_entry e
;
2003 if (find_pack_entry(sha1
, &e
, NULL
))
2005 return find_sha1_file(sha1
, &st
) ? 1 : 0;
2009 * reads from fd as long as possible into a supplied buffer of size bytes.
2010 * If necessary the buffer's size is increased using realloc()
2012 * returns 0 if anything went fine and -1 otherwise
2014 * NOTE: both buf and size may change, but even when -1 is returned
2015 * you still have to free() it yourself.
2017 int read_pipe(int fd
, char** return_buf
, unsigned long* return_size
)
2019 char* buf
= *return_buf
;
2020 unsigned long size
= *return_size
;
2022 unsigned long off
= 0;
2025 iret
= xread(fd
, buf
+ off
, size
- off
);
2030 buf
= xrealloc(buf
, size
);
2043 int index_pipe(unsigned char *sha1
, int fd
, const char *type
, int write_object
)
2045 unsigned long size
= 4096;
2046 char *buf
= xmalloc(size
);
2049 if (read_pipe(fd
, &buf
, &size
)) {
2057 ret
= write_sha1_file(buf
, size
, type
, sha1
);
2059 ret
= hash_sha1_file(buf
, size
, type
, sha1
);
2064 int index_fd(unsigned char *sha1
, int fd
, struct stat
*st
, int write_object
, const char *type
)
2066 unsigned long size
= st
->st_size
;
2068 int ret
, re_allocated
= 0;
2072 buf
= xmmap(NULL
, size
, PROT_READ
, MAP_PRIVATE
, fd
, 0);
2079 * Convert blobs to git internal format
2081 if (!strcmp(type
, blob_type
)) {
2082 unsigned long nsize
= size
;
2084 if (convert_to_git(NULL
, &nbuf
, &nsize
)) {
2094 ret
= write_sha1_file(buf
, size
, type
, sha1
);
2096 ret
= hash_sha1_file(buf
, size
, type
, sha1
);
2106 int index_path(unsigned char *sha1
, const char *path
, struct stat
*st
, int write_object
)
2111 switch (st
->st_mode
& S_IFMT
) {
2113 fd
= open(path
, O_RDONLY
);
2115 return error("open(\"%s\"): %s", path
,
2117 if (index_fd(sha1
, fd
, st
, write_object
, NULL
) < 0)
2118 return error("%s: failed to insert into database",
2122 target
= xmalloc(st
->st_size
+1);
2123 if (readlink(path
, target
, st
->st_size
+1) != st
->st_size
) {
2124 char *errstr
= strerror(errno
);
2126 return error("readlink(\"%s\"): %s", path
,
2130 hash_sha1_file(target
, st
->st_size
, blob_type
, sha1
);
2131 else if (write_sha1_file(target
, st
->st_size
, blob_type
, sha1
))
2132 return error("%s: failed to insert into database",
2137 return error("%s: unsupported file type", path
);
2142 int read_pack_header(int fd
, struct pack_header
*header
)
2144 char *c
= (char*)header
;
2145 ssize_t remaining
= sizeof(struct pack_header
);
2147 ssize_t r
= xread(fd
, c
, remaining
);
2149 /* "eof before pack header was fully read" */
2150 return PH_ERROR_EOF
;
2153 } while (remaining
> 0);
2154 if (header
->hdr_signature
!= htonl(PACK_SIGNATURE
))
2155 /* "protocol error (pack signature mismatch detected)" */
2156 return PH_ERROR_PACK_SIGNATURE
;
2157 if (!pack_version_ok(header
->hdr_version
))
2158 /* "protocol error (pack version unsupported)" */
2159 return PH_ERROR_PROTOCOL
;