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 /* returns the number of chars to skip to first component */
84 static inline int is_path_absolute(const char *path
)
87 if (isalpha(path
[0]) && path
[1] == ':')
88 return 2 + (path
[2] == '/');
89 /* TODO: C:dir/file 'relative' paths are not catered for */
94 int safe_create_leading_directories(char *path
)
96 char *pos
= path
+ is_path_absolute(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 a "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_path_absolute(entry
) && relative_base
) {
264 /* Relative alt-odb */
266 base_len
= strlen(relative_base
) + 1;
270 ent
= xmalloc(sizeof(*ent
) + entlen
);
272 if (!is_path_absolute(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_path_absolute(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
)
364 sprintf(path
, "%s/info/alternates", relative_base
);
365 fd
= open(path
, O_RDONLY
);
368 if (fstat(fd
, &st
) || (st
.st_size
== 0)) {
372 map
= xmmap(NULL
, st
.st_size
, PROT_READ
, MAP_PRIVATE
, fd
, 0);
375 link_alt_odb_entries(map
, map
+ st
.st_size
, '\n', relative_base
, depth
);
377 munmap(map
, st
.st_size
);
380 void prepare_alt_odb(void)
384 alt
= getenv(ALTERNATE_DB_ENVIRONMENT
);
389 alt_odb_tail
= &alt_odb_list
;
390 link_alt_odb_entries(alt
, alt
+ strlen(alt
), ':', NULL
, 0);
392 read_info_alternates(get_object_directory(), 0);
395 static char *find_sha1_file(const unsigned char *sha1
, struct stat
*st
)
397 char *name
= sha1_file_name(sha1
);
398 struct alternate_object_database
*alt
;
403 for (alt
= alt_odb_list
; alt
; alt
= alt
->next
) {
405 fill_sha1_path(name
, sha1
);
406 if (!stat(alt
->base
, st
))
412 static unsigned int pack_used_ctr
;
413 static unsigned int pack_mmap_calls
;
414 static unsigned int peak_pack_open_windows
;
415 static unsigned int pack_open_windows
;
416 static size_t peak_pack_mapped
;
417 static size_t pack_mapped
;
418 static size_t page_size
;
419 struct packed_git
*packed_git
;
424 "pack_report: getpagesize() = %10" SZ_FMT
"\n"
425 "pack_report: core.packedGitWindowSize = %10" SZ_FMT
"\n"
426 "pack_report: core.packedGitLimit = %10" SZ_FMT
"\n",
428 packed_git_window_size
,
431 "pack_report: pack_used_ctr = %10u\n"
432 "pack_report: pack_mmap_calls = %10u\n"
433 "pack_report: pack_open_windows = %10u / %10u\n"
434 "pack_report: pack_mapped = "
435 "%10" SZ_FMT
" / %10" SZ_FMT
"\n",
438 pack_open_windows
, peak_pack_open_windows
,
439 pack_mapped
, peak_pack_mapped
);
442 static int check_packed_git_idx(const char *path
, unsigned long *idx_size_
,
447 unsigned long idx_size
;
449 int fd
= open(path
, O_RDONLY
);
453 if (fstat(fd
, &st
)) {
457 idx_size
= st
.st_size
;
458 idx_map
= xmmap(NULL
, idx_size
, PROT_READ
, MAP_PRIVATE
, fd
, 0);
463 *idx_size_
= idx_size
;
465 /* check index map */
466 if (idx_size
< 4*256 + 20 + 20)
467 return error("index file %s is too small", path
);
469 /* a future index format would start with this, as older git
470 * binaries would fail the non-monotonic index check below.
471 * give a nicer warning to the user if we can.
473 if (index
[0] == htonl(PACK_IDX_SIGNATURE
))
474 return error("index file %s is a newer version"
475 " and is not supported by this binary"
476 " (try upgrading GIT to a newer version)",
480 for (i
= 0; i
< 256; i
++) {
481 unsigned int n
= ntohl(index
[i
]);
483 return error("non-monotonic index %s", path
);
489 * - 256 index entries 4 bytes each
490 * - 24-byte entries * nr (20-byte sha1 + 4-byte offset)
491 * - 20-byte SHA1 of the packfile
492 * - 20-byte SHA1 file checksum
494 if (idx_size
!= 4*256 + nr
* 24 + 20 + 20)
495 return error("wrong index file size in %s", path
);
500 static void scan_windows(struct packed_git
*p
,
501 struct packed_git
**lru_p
,
502 struct pack_window
**lru_w
,
503 struct pack_window
**lru_l
)
505 struct pack_window
*w
, *w_l
;
507 for (w_l
= NULL
, w
= p
->windows
; w
; w
= w
->next
) {
509 if (!*lru_w
|| w
->last_used
< (*lru_w
)->last_used
) {
519 static int unuse_one_window(struct packed_git
*current
)
521 struct packed_git
*p
, *lru_p
= NULL
;
522 struct pack_window
*lru_w
= NULL
, *lru_l
= NULL
;
525 scan_windows(current
, &lru_p
, &lru_w
, &lru_l
);
526 for (p
= packed_git
; p
; p
= p
->next
)
527 scan_windows(p
, &lru_p
, &lru_w
, &lru_l
);
529 munmap(lru_w
->base
, lru_w
->len
);
530 pack_mapped
-= lru_w
->len
;
532 lru_l
->next
= lru_w
->next
;
534 lru_p
->windows
= lru_w
->next
;
535 if (!lru_p
->windows
&& lru_p
!= current
) {
536 close(lru_p
->pack_fd
);
547 void release_pack_memory(size_t need
)
549 size_t cur
= pack_mapped
;
550 while (need
>= (cur
- pack_mapped
) && unuse_one_window(NULL
))
554 void unuse_pack(struct pack_window
**w_cursor
)
556 struct pack_window
*w
= *w_cursor
;
563 static void open_packed_git(struct packed_git
*p
)
566 struct pack_header hdr
;
567 unsigned char sha1
[20];
568 unsigned char *idx_sha1
;
571 p
->pack_fd
= open(p
->pack_name
, O_RDONLY
);
572 if (p
->pack_fd
< 0 || fstat(p
->pack_fd
, &st
))
573 die("packfile %s cannot be opened", p
->pack_name
);
575 /* If we created the struct before we had the pack we lack size. */
577 if (!S_ISREG(st
.st_mode
))
578 die("packfile %s not a regular file", p
->pack_name
);
579 p
->pack_size
= st
.st_size
;
580 } else if (p
->pack_size
!= st
.st_size
)
581 die("packfile %s size changed", p
->pack_name
);
584 /* We leave these file descriptors open with sliding mmap;
585 * there is no point keeping them open across exec(), though.
587 fd_flag
= fcntl(p
->pack_fd
, F_GETFD
, 0);
589 die("cannot determine file descriptor flags");
590 fd_flag
|= FD_CLOEXEC
;
591 if (fcntl(p
->pack_fd
, F_SETFD
, fd_flag
) == -1)
592 die("cannot set FD_CLOEXEC");
595 /* Verify we recognize this pack file format. */
596 if (read_in_full(p
->pack_fd
, &hdr
, sizeof(hdr
)) != sizeof(hdr
))
597 die("file %s is far too short to be a packfile", p
->pack_name
);
598 if (hdr
.hdr_signature
!= htonl(PACK_SIGNATURE
))
599 die("file %s is not a GIT packfile", p
->pack_name
);
600 if (!pack_version_ok(hdr
.hdr_version
))
601 die("packfile %s is version %u and not supported"
602 " (try upgrading GIT to a newer version)",
603 p
->pack_name
, ntohl(hdr
.hdr_version
));
605 /* Verify the pack matches its index. */
606 if (num_packed_objects(p
) != ntohl(hdr
.hdr_entries
))
607 die("packfile %s claims to have %u objects"
608 " while index size indicates %u objects",
609 p
->pack_name
, ntohl(hdr
.hdr_entries
),
610 num_packed_objects(p
));
611 if (lseek(p
->pack_fd
, p
->pack_size
- sizeof(sha1
), SEEK_SET
) == -1)
612 die("end of packfile %s is unavailable", p
->pack_name
);
613 if (read_in_full(p
->pack_fd
, sha1
, sizeof(sha1
)) != sizeof(sha1
))
614 die("packfile %s signature is unavailable", p
->pack_name
);
615 idx_sha1
= ((unsigned char *)p
->index_base
) + p
->index_size
- 40;
616 if (hashcmp(sha1
, idx_sha1
))
617 die("packfile %s does not match index", p
->pack_name
);
620 static int in_window(struct pack_window
*win
, unsigned long offset
)
622 /* We must promise at least 20 bytes (one hash) after the
623 * offset is available from this window, otherwise the offset
624 * is not actually in this window and a different window (which
625 * has that one hash excess) must be used. This is to support
626 * the object header and delta base parsing routines below.
628 off_t win_off
= win
->offset
;
629 return win_off
<= offset
630 && (offset
+ 20) <= (win_off
+ win
->len
);
633 unsigned char* use_pack(struct packed_git
*p
,
634 struct pack_window
**w_cursor
,
635 unsigned long offset
,
638 struct pack_window
*win
= *w_cursor
;
640 if (p
->pack_fd
== -1)
643 /* Since packfiles end in a hash of their content and its
644 * pointless to ask for an offset into the middle of that
645 * hash, and the in_window function above wouldn't match
646 * don't allow an offset too close to the end of the file.
648 if (offset
> (p
->pack_size
- 20))
649 die("offset beyond end of packfile (truncated pack?)");
651 if (!win
|| !in_window(win
, offset
)) {
654 for (win
= p
->windows
; win
; win
= win
->next
) {
655 if (in_window(win
, offset
))
660 page_size
= getpagesize();
661 win
= xcalloc(1, sizeof(*win
));
662 win
->offset
= (offset
/ page_size
) * page_size
;
663 win
->len
= p
->pack_size
- win
->offset
;
664 if (win
->len
> packed_git_window_size
)
665 win
->len
= packed_git_window_size
;
666 pack_mapped
+= win
->len
;
667 while (packed_git_limit
< pack_mapped
668 && unuse_one_window(p
))
670 win
->base
= xmmap(NULL
, win
->len
,
671 PROT_READ
, MAP_PRIVATE
,
672 p
->pack_fd
, win
->offset
);
673 if (win
->base
== MAP_FAILED
)
674 die("packfile %s cannot be mapped: %s",
679 if (pack_mapped
> peak_pack_mapped
)
680 peak_pack_mapped
= pack_mapped
;
681 if (pack_open_windows
> peak_pack_open_windows
)
682 peak_pack_open_windows
= pack_open_windows
;
683 win
->next
= p
->windows
;
687 if (win
!= *w_cursor
) {
688 win
->last_used
= pack_used_ctr
++;
692 offset
-= win
->offset
;
694 *left
= win
->len
- offset
;
695 return win
->base
+ offset
;
698 struct packed_git
*add_packed_git(char *path
, int path_len
, int local
)
701 struct packed_git
*p
;
702 unsigned long idx_size
;
704 unsigned char sha1
[20];
706 if (check_packed_git_idx(path
, &idx_size
, &idx_map
))
709 /* do we have a corresponding .pack file? */
710 strcpy(path
+ path_len
- 4, ".pack");
711 if (stat(path
, &st
) || !S_ISREG(st
.st_mode
)) {
712 munmap(idx_map
, idx_size
);
715 /* ok, it looks sane as far as we can check without
716 * actually mapping the pack file.
718 p
= xmalloc(sizeof(*p
) + path_len
+ 2);
719 strcpy(p
->pack_name
, path
);
720 p
->index_size
= idx_size
;
721 p
->pack_size
= st
.st_size
;
722 p
->index_base
= idx_map
;
726 p
->pack_local
= local
;
727 if ((path_len
> 44) && !get_sha1_hex(path
+ path_len
- 44, sha1
))
728 hashcpy(p
->sha1
, sha1
);
732 struct packed_git
*parse_pack_index(unsigned char *sha1
)
734 char *path
= sha1_pack_index_name(sha1
);
735 return parse_pack_index_file(sha1
, path
);
738 struct packed_git
*parse_pack_index_file(const unsigned char *sha1
, char *idx_path
)
740 struct packed_git
*p
;
741 unsigned long idx_size
;
745 if (check_packed_git_idx(idx_path
, &idx_size
, &idx_map
))
748 path
= sha1_pack_name(sha1
);
750 p
= xmalloc(sizeof(*p
) + strlen(path
) + 2);
751 strcpy(p
->pack_name
, path
);
752 p
->index_size
= idx_size
;
754 p
->index_base
= idx_map
;
758 hashcpy(p
->sha1
, sha1
);
762 void install_packed_git(struct packed_git
*pack
)
764 pack
->next
= packed_git
;
768 static void prepare_packed_git_one(char *objdir
, int local
)
775 sprintf(path
, "%s/pack", objdir
);
780 error("unable to open object pack directory: %s: %s",
781 path
, strerror(errno
));
785 while ((de
= readdir(dir
)) != NULL
) {
786 int namelen
= strlen(de
->d_name
);
787 struct packed_git
*p
;
789 if (!has_extension(de
->d_name
, ".idx"))
792 /* we have .idx. Is it a file we can map? */
793 strcpy(path
+ len
, de
->d_name
);
794 for (p
= packed_git
; p
; p
= p
->next
) {
795 if (!memcmp(path
, p
->pack_name
, len
+ namelen
- 4))
800 p
= add_packed_git(path
, len
+ namelen
, local
);
803 p
->next
= packed_git
;
809 static int prepare_packed_git_run_once
= 0;
810 void prepare_packed_git(void)
812 struct alternate_object_database
*alt
;
814 if (prepare_packed_git_run_once
)
816 prepare_packed_git_one(get_object_directory(), 1);
818 for (alt
= alt_odb_list
; alt
; alt
= alt
->next
) {
820 prepare_packed_git_one(alt
->base
, 0);
823 prepare_packed_git_run_once
= 1;
826 void reprepare_packed_git(void)
828 prepare_packed_git_run_once
= 0;
829 prepare_packed_git();
832 int check_sha1_signature(const unsigned char *sha1
, void *map
, unsigned long size
, const char *type
)
834 unsigned char real_sha1
[20];
835 hash_sha1_file(map
, size
, type
, real_sha1
);
836 return hashcmp(sha1
, real_sha1
) ? -1 : 0;
839 void *map_sha1_file(const unsigned char *sha1
, unsigned long *size
)
844 char *filename
= find_sha1_file(sha1
, &st
);
850 fd
= open(filename
, O_RDONLY
| sha1_file_open_flag
);
852 /* See if it works without O_NOATIME */
853 switch (sha1_file_open_flag
) {
855 fd
= open(filename
, O_RDONLY
);
863 /* If it failed once, it will probably fail again.
864 * Stop using O_NOATIME
866 sha1_file_open_flag
= 0;
868 map
= xmmap(NULL
, st
.st_size
, PROT_READ
, MAP_PRIVATE
, fd
, 0);
874 int legacy_loose_object(unsigned char *map
)
879 * Is it a zlib-compressed buffer? If so, the first byte
880 * must be 0x78 (15-bit window size, deflated), and the
881 * first 16-bit word is evenly divisible by 31
883 word
= (map
[0] << 8) + map
[1];
884 if (map
[0] == 0x78 && !(word
% 31))
890 unsigned long unpack_object_header_gently(const unsigned char *buf
, unsigned long len
, enum object_type
*type
, unsigned long *sizep
)
895 unsigned long used
= 0;
898 *type
= (c
>> 4) & 7;
904 if (sizeof(long) * 8 <= shift
)
907 size
+= (c
& 0x7f) << shift
;
914 static int unpack_sha1_header(z_stream
*stream
, unsigned char *map
, unsigned long mapsize
, void *buffer
, unsigned long bufsiz
)
916 unsigned long size
, used
;
917 static const char valid_loose_object_type
[8] = {
919 1, 1, 1, 1, /* "commit", "tree", "blob", "tag" */
920 0, /* "delta" and others are invalid in a loose object */
922 enum object_type type
;
924 /* Get the data stream */
925 memset(stream
, 0, sizeof(*stream
));
926 stream
->next_in
= map
;
927 stream
->avail_in
= mapsize
;
928 stream
->next_out
= buffer
;
929 stream
->avail_out
= bufsiz
;
931 if (legacy_loose_object(map
)) {
933 return inflate(stream
, 0);
936 used
= unpack_object_header_gently(map
, mapsize
, &type
, &size
);
937 if (!used
|| !valid_loose_object_type
[type
])
942 /* Set up the stream for the rest.. */
943 stream
->next_in
= map
;
944 stream
->avail_in
= mapsize
;
947 /* And generate the fake traditional header */
948 stream
->total_out
= 1 + snprintf(buffer
, bufsiz
, "%s %lu",
949 type_names
[type
], size
);
953 static void *unpack_sha1_rest(z_stream
*stream
, void *buffer
, unsigned long size
)
955 int bytes
= strlen(buffer
) + 1;
956 unsigned char *buf
= xmalloc(1+size
);
959 n
= stream
->total_out
- bytes
;
962 memcpy(buf
, (char *) buffer
+ bytes
, n
);
965 stream
->next_out
= buf
+ bytes
;
966 stream
->avail_out
= size
- bytes
;
967 while (inflate(stream
, Z_FINISH
) == Z_OK
)
976 * We used to just use "sscanf()", but that's actually way
977 * too permissive for what we want to check. So do an anal
978 * object header parse by hand.
980 static int parse_sha1_header(char *hdr
, char *type
, unsigned long *sizep
)
986 * The type can be at most ten bytes (including the
987 * terminating '\0' that we add), and is followed by
1002 * The length must follow immediately, and be in canonical
1003 * decimal format (ie "010" is not valid).
1005 size
= *hdr
++ - '0';
1010 unsigned long c
= *hdr
- '0';
1014 size
= size
* 10 + c
;
1020 * The length must be followed by a zero byte
1022 return *hdr
? -1 : 0;
1025 void * unpack_sha1_file(void *map
, unsigned long mapsize
, char *type
, unsigned long *size
)
1031 ret
= unpack_sha1_header(&stream
, map
, mapsize
, hdr
, sizeof(hdr
));
1032 if (ret
< Z_OK
|| parse_sha1_header(hdr
, type
, size
) < 0)
1035 return unpack_sha1_rest(&stream
, hdr
, *size
);
1038 static unsigned long get_delta_base(struct packed_git
*p
,
1039 struct pack_window
**w_curs
,
1040 unsigned long offset
,
1041 enum object_type kind
,
1042 unsigned long delta_obj_offset
,
1043 unsigned long *base_obj_offset
)
1045 unsigned char *base_info
= use_pack(p
, w_curs
, offset
, NULL
);
1046 unsigned long base_offset
;
1048 /* use_pack() assured us we have [base_info, base_info + 20)
1049 * as a range that we can look at without walking off the
1050 * end of the mapped window. Its actually the hash size
1051 * that is assured. An OFS_DELTA longer than the hash size
1052 * is stupid, as then a REF_DELTA would be smaller to store.
1054 if (kind
== OBJ_OFS_DELTA
) {
1056 unsigned char c
= base_info
[used
++];
1057 base_offset
= c
& 127;
1060 if (!base_offset
|| base_offset
& ~(~0UL >> 7))
1061 die("offset value overflow for delta base object");
1062 c
= base_info
[used
++];
1063 base_offset
= (base_offset
<< 7) + (c
& 127);
1065 base_offset
= delta_obj_offset
- base_offset
;
1066 if (base_offset
>= delta_obj_offset
)
1067 die("delta base offset out of bound");
1069 } else if (kind
== OBJ_REF_DELTA
) {
1070 /* The base entry _must_ be in the same pack */
1071 base_offset
= find_pack_entry_one(base_info
, p
);
1073 die("failed to find delta-pack base object %s",
1074 sha1_to_hex(base_info
));
1077 die("I am totally screwed");
1078 *base_obj_offset
= base_offset
;
1082 /* forward declaration for a mutually recursive function */
1083 static int packed_object_info(struct packed_git
*p
, unsigned long offset
,
1084 char *type
, unsigned long *sizep
);
1086 static int packed_delta_info(struct packed_git
*p
,
1087 struct pack_window
**w_curs
,
1088 unsigned long offset
,
1089 enum object_type kind
,
1090 unsigned long obj_offset
,
1092 unsigned long *sizep
)
1094 unsigned long base_offset
;
1096 offset
= get_delta_base(p
, w_curs
, offset
, kind
,
1097 obj_offset
, &base_offset
);
1099 /* We choose to only get the type of the base object and
1100 * ignore potentially corrupt pack file that expects the delta
1101 * based on a base with a wrong size. This saves tons of
1104 if (packed_object_info(p
, base_offset
, type
, NULL
))
1105 die("cannot get info for delta-pack base");
1108 const unsigned char *data
;
1109 unsigned char delta_head
[20], *in
;
1110 unsigned long result_size
;
1114 memset(&stream
, 0, sizeof(stream
));
1115 stream
.next_out
= delta_head
;
1116 stream
.avail_out
= sizeof(delta_head
);
1118 inflateInit(&stream
);
1120 in
= use_pack(p
, w_curs
, offset
, &stream
.avail_in
);
1121 stream
.next_in
= in
;
1122 st
= inflate(&stream
, Z_FINISH
);
1123 offset
+= stream
.next_in
- in
;
1124 } while ((st
== Z_OK
|| st
== Z_BUF_ERROR
)
1125 && stream
.total_out
< sizeof(delta_head
));
1126 inflateEnd(&stream
);
1127 if ((st
!= Z_STREAM_END
) &&
1128 stream
.total_out
!= sizeof(delta_head
))
1129 die("delta data unpack-initial failed");
1131 /* Examine the initial part of the delta to figure out
1136 /* ignore base size */
1137 get_delta_hdr_size(&data
, delta_head
+sizeof(delta_head
));
1139 /* Read the result size */
1140 result_size
= get_delta_hdr_size(&data
, delta_head
+sizeof(delta_head
));
1141 *sizep
= result_size
;
1146 static unsigned long unpack_object_header(struct packed_git
*p
,
1147 struct pack_window
**w_curs
,
1148 unsigned long offset
,
1149 enum object_type
*type
,
1150 unsigned long *sizep
)
1152 unsigned char *base
;
1156 /* use_pack() assures us we have [base, base + 20) available
1157 * as a range that we can look at at. (Its actually the hash
1158 * size that is assurred.) With our object header encoding
1159 * the maximum deflated object size is 2^137, which is just
1160 * insane, so we know won't exceed what we have been given.
1162 base
= use_pack(p
, w_curs
, offset
, &left
);
1163 used
= unpack_object_header_gently(base
, left
, type
, sizep
);
1165 die("object offset outside of pack file");
1167 return offset
+ used
;
1170 void packed_object_info_detail(struct packed_git
*p
,
1171 unsigned long offset
,
1173 unsigned long *size
,
1174 unsigned long *store_size
,
1175 unsigned int *delta_chain_length
,
1176 unsigned char *base_sha1
)
1178 struct pack_window
*w_curs
= NULL
;
1179 unsigned long obj_offset
, val
;
1180 unsigned char *next_sha1
;
1181 enum object_type kind
;
1183 *delta_chain_length
= 0;
1184 obj_offset
= offset
;
1185 offset
= unpack_object_header(p
, &w_curs
, offset
, &kind
, size
);
1190 die("pack %s contains unknown object type %d",
1191 p
->pack_name
, kind
);
1196 strcpy(type
, type_names
[kind
]);
1197 *store_size
= 0; /* notyet */
1198 unuse_pack(&w_curs
);
1201 get_delta_base(p
, &w_curs
, offset
, kind
,
1202 obj_offset
, &offset
);
1203 if (*delta_chain_length
== 0) {
1204 /* TODO: find base_sha1 as pointed by offset */
1208 next_sha1
= use_pack(p
, &w_curs
, offset
, NULL
);
1209 if (*delta_chain_length
== 0)
1210 hashcpy(base_sha1
, next_sha1
);
1211 offset
= find_pack_entry_one(next_sha1
, p
);
1214 obj_offset
= offset
;
1215 offset
= unpack_object_header(p
, &w_curs
, offset
, &kind
, &val
);
1216 (*delta_chain_length
)++;
1220 static int packed_object_info(struct packed_git
*p
, unsigned long offset
,
1221 char *type
, unsigned long *sizep
)
1223 struct pack_window
*w_curs
= NULL
;
1224 unsigned long size
, obj_offset
= offset
;
1225 enum object_type kind
;
1228 offset
= unpack_object_header(p
, &w_curs
, offset
, &kind
, &size
);
1233 r
= packed_delta_info(p
, &w_curs
, offset
, kind
,
1234 obj_offset
, type
, sizep
);
1235 unuse_pack(&w_curs
);
1241 strcpy(type
, type_names
[kind
]);
1242 unuse_pack(&w_curs
);
1245 die("pack %s contains unknown object type %d",
1246 p
->pack_name
, kind
);
1253 static void *unpack_compressed_entry(struct packed_git
*p
,
1254 struct pack_window
**w_curs
,
1255 unsigned long offset
,
1260 unsigned char *buffer
, *in
;
1262 buffer
= xmalloc(size
+ 1);
1264 memset(&stream
, 0, sizeof(stream
));
1265 stream
.next_out
= buffer
;
1266 stream
.avail_out
= size
;
1268 inflateInit(&stream
);
1270 in
= use_pack(p
, w_curs
, offset
, &stream
.avail_in
);
1271 stream
.next_in
= in
;
1272 st
= inflate(&stream
, Z_FINISH
);
1273 offset
+= stream
.next_in
- in
;
1274 } while (st
== Z_OK
|| st
== Z_BUF_ERROR
);
1275 inflateEnd(&stream
);
1276 if ((st
!= Z_STREAM_END
) || stream
.total_out
!= size
) {
1284 static void *unpack_delta_entry(struct packed_git
*p
,
1285 struct pack_window
**w_curs
,
1286 unsigned long offset
,
1287 unsigned long delta_size
,
1288 enum object_type kind
,
1289 unsigned long obj_offset
,
1291 unsigned long *sizep
)
1293 void *delta_data
, *result
, *base
;
1294 unsigned long result_size
, base_size
, base_offset
;
1296 offset
= get_delta_base(p
, w_curs
, offset
, kind
,
1297 obj_offset
, &base_offset
);
1298 base
= unpack_entry(p
, base_offset
, type
, &base_size
);
1300 die("failed to read delta base object at %lu from %s",
1301 base_offset
, p
->pack_name
);
1303 delta_data
= unpack_compressed_entry(p
, w_curs
, offset
, delta_size
);
1304 result
= patch_delta(base
, base_size
,
1305 delta_data
, delta_size
,
1308 die("failed to apply delta");
1311 *sizep
= result_size
;
1315 void *unpack_entry(struct packed_git
*p
, unsigned long offset
,
1316 char *type
, unsigned long *sizep
)
1318 struct pack_window
*w_curs
= NULL
;
1319 unsigned long size
, obj_offset
= offset
;
1320 enum object_type kind
;
1323 offset
= unpack_object_header(p
, &w_curs
, offset
, &kind
, &size
);
1327 retval
= unpack_delta_entry(p
, &w_curs
, offset
, size
,
1328 kind
, obj_offset
, type
, sizep
);
1334 strcpy(type
, type_names
[kind
]);
1336 retval
= unpack_compressed_entry(p
, &w_curs
, offset
, size
);
1339 die("unknown object type %i in %s", kind
, p
->pack_name
);
1341 unuse_pack(&w_curs
);
1345 int num_packed_objects(const struct packed_git
*p
)
1347 /* See check_packed_git_idx() */
1348 return (p
->index_size
- 20 - 20 - 4*256) / 24;
1351 int nth_packed_object_sha1(const struct packed_git
*p
, int n
,
1352 unsigned char* sha1
)
1354 void *index
= p
->index_base
+ 256;
1355 if (n
< 0 || num_packed_objects(p
) <= n
)
1357 hashcpy(sha1
, (unsigned char *) index
+ (24 * n
) + 4);
1361 unsigned long find_pack_entry_one(const unsigned char *sha1
,
1362 struct packed_git
*p
)
1364 uint32_t *level1_ofs
= p
->index_base
;
1365 int hi
= ntohl(level1_ofs
[*sha1
]);
1366 int lo
= ((*sha1
== 0x0) ? 0 : ntohl(level1_ofs
[*sha1
- 1]));
1367 void *index
= p
->index_base
+ 256;
1370 int mi
= (lo
+ hi
) / 2;
1371 int cmp
= hashcmp((unsigned char *)index
+ (24 * mi
) + 4, sha1
);
1373 return ntohl(*((uint32_t *)((char *)index
+ (24 * mi
))));
1382 static int matches_pack_name(struct packed_git
*p
, const char *ig
)
1384 const char *last_c
, *c
;
1386 if (!strcmp(p
->pack_name
, ig
))
1389 for (c
= p
->pack_name
, last_c
= c
; *c
;)
1394 if (!strcmp(last_c
, ig
))
1400 static int find_pack_entry(const unsigned char *sha1
, struct pack_entry
*e
, const char **ignore_packed
)
1402 struct packed_git
*p
;
1403 unsigned long offset
;
1405 prepare_packed_git();
1407 for (p
= packed_git
; p
; p
= p
->next
) {
1408 if (ignore_packed
) {
1410 for (ig
= ignore_packed
; *ig
; ig
++)
1411 if (!matches_pack_name(p
, *ig
))
1416 offset
= find_pack_entry_one(sha1
, p
);
1420 hashcpy(e
->sha1
, sha1
);
1427 struct packed_git
*find_sha1_pack(const unsigned char *sha1
,
1428 struct packed_git
*packs
)
1430 struct packed_git
*p
;
1432 for (p
= packs
; p
; p
= p
->next
) {
1433 if (find_pack_entry_one(sha1
, p
))
1440 static int sha1_loose_object_info(const unsigned char *sha1
, char *type
, unsigned long *sizep
)
1443 unsigned long mapsize
, size
;
1448 map
= map_sha1_file(sha1
, &mapsize
);
1450 return error("unable to find %s", sha1_to_hex(sha1
));
1451 if (unpack_sha1_header(&stream
, map
, mapsize
, hdr
, sizeof(hdr
)) < 0)
1452 status
= error("unable to unpack %s header",
1454 if (parse_sha1_header(hdr
, type
, &size
) < 0)
1455 status
= error("unable to parse %s header", sha1_to_hex(sha1
));
1461 inflateEnd(&stream
);
1462 munmap(map
, mapsize
);
1466 int sha1_object_info(const unsigned char *sha1
, char *type
, unsigned long *sizep
)
1468 struct pack_entry e
;
1470 if (!find_pack_entry(sha1
, &e
, NULL
)) {
1471 reprepare_packed_git();
1472 if (!find_pack_entry(sha1
, &e
, NULL
))
1473 return sha1_loose_object_info(sha1
, type
, sizep
);
1475 return packed_object_info(e
.p
, e
.offset
, type
, sizep
);
1478 static void *read_packed_sha1(const unsigned char *sha1
, char *type
, unsigned long *size
)
1480 struct pack_entry e
;
1482 if (!find_pack_entry(sha1
, &e
, NULL
)) {
1483 error("cannot read sha1_file for %s", sha1_to_hex(sha1
));
1486 return unpack_entry(e
.p
, e
.offset
, type
, size
);
1489 void * read_sha1_file(const unsigned char *sha1
, char *type
, unsigned long *size
)
1491 unsigned long mapsize
;
1493 struct pack_entry e
;
1495 if (find_pack_entry(sha1
, &e
, NULL
))
1496 return read_packed_sha1(sha1
, type
, size
);
1497 map
= map_sha1_file(sha1
, &mapsize
);
1499 buf
= unpack_sha1_file(map
, mapsize
, type
, size
);
1500 munmap(map
, mapsize
);
1503 reprepare_packed_git();
1504 if (find_pack_entry(sha1
, &e
, NULL
))
1505 return read_packed_sha1(sha1
, type
, size
);
1509 void *read_object_with_reference(const unsigned char *sha1
,
1510 const char *required_type
,
1511 unsigned long *size
,
1512 unsigned char *actual_sha1_return
)
1516 unsigned long isize
;
1517 unsigned char actual_sha1
[20];
1519 hashcpy(actual_sha1
, sha1
);
1521 int ref_length
= -1;
1522 const char *ref_type
= NULL
;
1524 buffer
= read_sha1_file(actual_sha1
, type
, &isize
);
1527 if (!strcmp(type
, required_type
)) {
1529 if (actual_sha1_return
)
1530 hashcpy(actual_sha1_return
, actual_sha1
);
1533 /* Handle references */
1534 else if (!strcmp(type
, commit_type
))
1536 else if (!strcmp(type
, tag_type
))
1537 ref_type
= "object ";
1542 ref_length
= strlen(ref_type
);
1544 if (memcmp(buffer
, ref_type
, ref_length
) ||
1545 get_sha1_hex((char *) buffer
+ ref_length
, actual_sha1
)) {
1550 /* Now we have the ID of the referred-to object in
1551 * actual_sha1. Check again. */
1555 static void write_sha1_file_prepare(void *buf
, unsigned long len
,
1556 const char *type
, unsigned char *sha1
,
1557 unsigned char *hdr
, int *hdrlen
)
1561 /* Generate the header */
1562 *hdrlen
= sprintf((char *)hdr
, "%s %lu", type
, len
)+1;
1566 SHA1_Update(&c
, hdr
, *hdrlen
);
1567 SHA1_Update(&c
, buf
, len
);
1568 SHA1_Final(sha1
, &c
);
1572 * Link the tempfile to the final place, possibly creating the
1573 * last directory level as you do so.
1575 * Returns the errno on failure, 0 on success.
1577 static int link_temp_to_file(const char *tmpfile
, const char *filename
)
1582 if (!link(tmpfile
, filename
))
1586 * Try to mkdir the last path component if that failed.
1588 * Re-try the "link()" regardless of whether the mkdir
1589 * succeeds, since a race might mean that somebody
1593 dir
= strrchr(filename
, '/');
1596 if (!mkdir(filename
, 0777) && adjust_shared_perm(filename
)) {
1601 if (!link(tmpfile
, filename
))
1609 * Move the just written object into its final resting place
1611 int move_temp_to_file(const char *tmpfile
, const char *filename
)
1613 int ret
= link_temp_to_file(tmpfile
, filename
);
1616 * Coda hack - coda doesn't like cross-directory links,
1617 * so we fall back to a rename, which will mean that it
1618 * won't be able to check collisions, but that's not a
1621 * The same holds for FAT formatted media.
1623 * When this succeeds, we just return 0. We have nothing
1626 if (ret
&& ret
!= EEXIST
) {
1627 if (!rename(tmpfile
, filename
))
1633 if (ret
!= EEXIST
) {
1634 return error("unable to write sha1 filename %s: %s\n", filename
, strerror(ret
));
1636 /* FIXME!!! Collision check here ? */
1642 static int write_buffer(int fd
, const void *buf
, size_t len
)
1644 if (write_in_full(fd
, buf
, len
) < 0)
1645 return error("file write error (%s)", strerror(errno
));
1649 static int write_binary_header(unsigned char *hdr
, enum object_type type
, unsigned long len
)
1654 c
= (type
<< 4) | (len
& 15);
1667 static void setup_object_header(z_stream
*stream
, const char *type
, unsigned long len
)
1671 if (use_legacy_headers
) {
1672 while (deflate(stream
, 0) == Z_OK
)
1676 if (!strcmp(type
, blob_type
))
1677 obj_type
= OBJ_BLOB
;
1678 else if (!strcmp(type
, tree_type
))
1679 obj_type
= OBJ_TREE
;
1680 else if (!strcmp(type
, commit_type
))
1681 obj_type
= OBJ_COMMIT
;
1682 else if (!strcmp(type
, tag_type
))
1685 die("trying to generate bogus object of type '%s'", type
);
1686 hdr
= write_binary_header(stream
->next_out
, obj_type
, len
);
1687 stream
->total_out
= hdr
;
1688 stream
->next_out
+= hdr
;
1689 stream
->avail_out
-= hdr
;
1692 int hash_sha1_file(void *buf
, unsigned long len
, const char *type
,
1693 unsigned char *sha1
)
1695 unsigned char hdr
[50];
1697 write_sha1_file_prepare(buf
, len
, type
, sha1
, hdr
, &hdrlen
);
1701 int write_sha1_file(void *buf
, unsigned long len
, const char *type
, unsigned char *returnsha1
)
1704 unsigned char *compressed
;
1706 unsigned char sha1
[20];
1708 static char tmpfile
[PATH_MAX
];
1709 unsigned char hdr
[50];
1712 /* Normally if we have it in the pack then we do not bother writing
1713 * it out into .git/objects/??/?{38} file.
1715 write_sha1_file_prepare(buf
, len
, type
, sha1
, hdr
, &hdrlen
);
1716 filename
= sha1_file_name(sha1
);
1718 hashcpy(returnsha1
, sha1
);
1719 if (has_sha1_file(sha1
))
1721 fd
= open(filename
, O_RDONLY
);
1724 * FIXME!!! We might do collision checking here, but we'd
1725 * need to uncompress the old file and check it. Later.
1731 if (errno
!= ENOENT
) {
1732 return error("sha1 file %s: %s\n", filename
, strerror(errno
));
1735 snprintf(tmpfile
, sizeof(tmpfile
), "%s/obj_XXXXXX", get_object_directory());
1737 fd
= mkstemp(tmpfile
);
1740 return error("insufficient permission for adding an object to repository database %s\n", get_object_directory());
1742 return error("unable to create temporary sha1 filename %s: %s\n", tmpfile
, strerror(errno
));
1746 memset(&stream
, 0, sizeof(stream
));
1747 deflateInit(&stream
, zlib_compression_level
);
1748 size
= 8 + deflateBound(&stream
, len
+hdrlen
);
1749 compressed
= xmalloc(size
);
1752 stream
.next_out
= compressed
;
1753 stream
.avail_out
= size
;
1755 /* First header.. */
1756 stream
.next_in
= hdr
;
1757 stream
.avail_in
= hdrlen
;
1758 setup_object_header(&stream
, type
, len
);
1760 /* Then the data itself.. */
1761 stream
.next_in
= buf
;
1762 stream
.avail_in
= len
;
1763 while (deflate(&stream
, Z_FINISH
) == Z_OK
)
1765 deflateEnd(&stream
);
1766 size
= stream
.total_out
;
1768 if (write_buffer(fd
, compressed
, size
) < 0)
1769 die("unable to write sha1 file");
1774 return move_temp_to_file(tmpfile
, filename
);
1778 * We need to unpack and recompress the object for writing
1779 * it out to a different file.
1781 static void *repack_object(const unsigned char *sha1
, unsigned long *objsize
)
1785 unsigned char *unpacked
;
1792 /* need to unpack and recompress it by itself */
1793 unpacked
= read_packed_sha1(sha1
, type
, &len
);
1795 hdrlen
= sprintf(hdr
, "%s %lu", type
, len
) + 1;
1798 memset(&stream
, 0, sizeof(stream
));
1799 deflateInit(&stream
, zlib_compression_level
);
1800 size
= deflateBound(&stream
, len
+ hdrlen
);
1801 buf
= xmalloc(size
);
1804 stream
.next_out
= buf
;
1805 stream
.avail_out
= size
;
1807 /* First header.. */
1808 stream
.next_in
= (void *)hdr
;
1809 stream
.avail_in
= hdrlen
;
1810 while (deflate(&stream
, 0) == Z_OK
)
1813 /* Then the data itself.. */
1814 stream
.next_in
= unpacked
;
1815 stream
.avail_in
= len
;
1816 while (deflate(&stream
, Z_FINISH
) == Z_OK
)
1818 deflateEnd(&stream
);
1821 *objsize
= stream
.total_out
;
1825 int write_sha1_to_fd(int fd
, const unsigned char *sha1
)
1828 unsigned long objsize
;
1829 void *buf
= map_sha1_file(sha1
, &objsize
);
1832 retval
= write_buffer(fd
, buf
, objsize
);
1833 munmap(buf
, objsize
);
1837 buf
= repack_object(sha1
, &objsize
);
1838 retval
= write_buffer(fd
, buf
, objsize
);
1843 int write_sha1_from_fd(const unsigned char *sha1
, int fd
, char *buffer
,
1844 size_t bufsize
, size_t *bufposn
)
1846 char tmpfile
[PATH_MAX
];
1849 unsigned char real_sha1
[20];
1850 unsigned char discard
[4096];
1854 snprintf(tmpfile
, sizeof(tmpfile
), "%s/obj_XXXXXX", get_object_directory());
1856 local
= mkstemp(tmpfile
);
1859 return error("insufficient permission for adding an object to repository database %s\n", get_object_directory());
1861 return error("unable to create temporary sha1 filename %s: %s\n", tmpfile
, strerror(errno
));
1864 memset(&stream
, 0, sizeof(stream
));
1866 inflateInit(&stream
);
1873 stream
.avail_in
= *bufposn
;
1874 stream
.next_in
= (unsigned char *) buffer
;
1876 stream
.next_out
= discard
;
1877 stream
.avail_out
= sizeof(discard
);
1878 ret
= inflate(&stream
, Z_SYNC_FLUSH
);
1879 SHA1_Update(&c
, discard
, sizeof(discard
) -
1881 } while (stream
.avail_in
&& ret
== Z_OK
);
1882 if (write_buffer(local
, buffer
, *bufposn
- stream
.avail_in
) < 0)
1883 die("unable to write sha1 file");
1884 memmove(buffer
, buffer
+ *bufposn
- stream
.avail_in
,
1886 *bufposn
= stream
.avail_in
;
1890 size
= xread(fd
, buffer
+ *bufposn
, bufsize
- *bufposn
);
1895 return error("Connection closed?");
1896 perror("Reading from connection");
1901 inflateEnd(&stream
);
1904 SHA1_Final(real_sha1
, &c
);
1905 if (ret
!= Z_STREAM_END
) {
1907 return error("File %s corrupted", sha1_to_hex(sha1
));
1909 if (hashcmp(sha1
, real_sha1
)) {
1911 return error("File %s has bad hash", sha1_to_hex(sha1
));
1914 return move_temp_to_file(tmpfile
, sha1_file_name(sha1
));
1917 int has_pack_index(const unsigned char *sha1
)
1920 if (stat(sha1_pack_index_name(sha1
), &st
))
1925 int has_pack_file(const unsigned char *sha1
)
1928 if (stat(sha1_pack_name(sha1
), &st
))
1933 int has_sha1_pack(const unsigned char *sha1
, const char **ignore_packed
)
1935 struct pack_entry e
;
1936 return find_pack_entry(sha1
, &e
, ignore_packed
);
1939 int has_sha1_file(const unsigned char *sha1
)
1942 struct pack_entry e
;
1944 if (find_pack_entry(sha1
, &e
, NULL
))
1946 return find_sha1_file(sha1
, &st
) ? 1 : 0;
1950 * reads from fd as long as possible into a supplied buffer of size bytes.
1951 * If necessary the buffer's size is increased using realloc()
1953 * returns 0 if anything went fine and -1 otherwise
1955 * NOTE: both buf and size may change, but even when -1 is returned
1956 * you still have to free() it yourself.
1958 int read_pipe(int fd
, char** return_buf
, unsigned long* return_size
)
1960 char* buf
= *return_buf
;
1961 unsigned long size
= *return_size
;
1963 unsigned long off
= 0;
1966 iret
= xread(fd
, buf
+ off
, size
- off
);
1971 buf
= xrealloc(buf
, size
);
1984 int index_pipe(unsigned char *sha1
, int fd
, const char *type
, int write_object
)
1986 unsigned long size
= 4096;
1987 char *buf
= xmalloc(size
);
1990 if (read_pipe(fd
, &buf
, &size
)) {
1998 ret
= write_sha1_file(buf
, size
, type
, sha1
);
2000 ret
= hash_sha1_file(buf
, size
, type
, sha1
);
2005 int index_fd(unsigned char *sha1
, int fd
, struct stat
*st
, int write_object
, const char *type
)
2007 unsigned long size
= st
->st_size
;
2013 buf
= xmmap(NULL
, size
, PROT_READ
, MAP_PRIVATE
, fd
, 0);
2019 ret
= write_sha1_file(buf
, size
, type
, sha1
);
2021 ret
= hash_sha1_file(buf
, size
, type
, sha1
);
2027 int index_path(unsigned char *sha1
, const char *path
, struct stat
*st
, int write_object
)
2032 switch (st
->st_mode
& S_IFMT
) {
2034 fd
= open(path
, O_RDONLY
);
2036 return error("open(\"%s\"): %s", path
,
2038 if (index_fd(sha1
, fd
, st
, write_object
, NULL
) < 0)
2039 return error("%s: failed to insert into database",
2043 target
= xmalloc(st
->st_size
+1);
2044 if (readlink(path
, target
, st
->st_size
+1) != st
->st_size
) {
2045 char *errstr
= strerror(errno
);
2047 return error("readlink(\"%s\"): %s", path
,
2051 hash_sha1_file(target
, st
->st_size
, blob_type
, sha1
);
2052 else if (write_sha1_file(target
, st
->st_size
, blob_type
, sha1
))
2053 return error("%s: failed to insert into database",
2058 return error("%s: unsupported file type", path
);