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
25 const unsigned char null_sha1
[20];
27 static unsigned int sha1_file_open_flag
= O_NOATIME
;
29 signed char hexval_table
[256] = {
30 -1, -1, -1, -1, -1, -1, -1, -1, /* 00-07 */
31 -1, -1, -1, -1, -1, -1, -1, -1, /* 08-0f */
32 -1, -1, -1, -1, -1, -1, -1, -1, /* 10-17 */
33 -1, -1, -1, -1, -1, -1, -1, -1, /* 18-1f */
34 -1, -1, -1, -1, -1, -1, -1, -1, /* 20-27 */
35 -1, -1, -1, -1, -1, -1, -1, -1, /* 28-2f */
36 0, 1, 2, 3, 4, 5, 6, 7, /* 30-37 */
37 8, 9, -1, -1, -1, -1, -1, -1, /* 38-3f */
38 -1, 10, 11, 12, 13, 14, 15, -1, /* 40-47 */
39 -1, -1, -1, -1, -1, -1, -1, -1, /* 48-4f */
40 -1, -1, -1, -1, -1, -1, -1, -1, /* 50-57 */
41 -1, -1, -1, -1, -1, -1, -1, -1, /* 58-5f */
42 -1, 10, 11, 12, 13, 14, 15, -1, /* 60-67 */
43 -1, -1, -1, -1, -1, -1, -1, -1, /* 68-67 */
44 -1, -1, -1, -1, -1, -1, -1, -1, /* 70-77 */
45 -1, -1, -1, -1, -1, -1, -1, -1, /* 78-7f */
46 -1, -1, -1, -1, -1, -1, -1, -1, /* 80-87 */
47 -1, -1, -1, -1, -1, -1, -1, -1, /* 88-8f */
48 -1, -1, -1, -1, -1, -1, -1, -1, /* 90-97 */
49 -1, -1, -1, -1, -1, -1, -1, -1, /* 98-9f */
50 -1, -1, -1, -1, -1, -1, -1, -1, /* a0-a7 */
51 -1, -1, -1, -1, -1, -1, -1, -1, /* a8-af */
52 -1, -1, -1, -1, -1, -1, -1, -1, /* b0-b7 */
53 -1, -1, -1, -1, -1, -1, -1, -1, /* b8-bf */
54 -1, -1, -1, -1, -1, -1, -1, -1, /* c0-c7 */
55 -1, -1, -1, -1, -1, -1, -1, -1, /* c8-cf */
56 -1, -1, -1, -1, -1, -1, -1, -1, /* d0-d7 */
57 -1, -1, -1, -1, -1, -1, -1, -1, /* d8-df */
58 -1, -1, -1, -1, -1, -1, -1, -1, /* e0-e7 */
59 -1, -1, -1, -1, -1, -1, -1, -1, /* e8-ef */
60 -1, -1, -1, -1, -1, -1, -1, -1, /* f0-f7 */
61 -1, -1, -1, -1, -1, -1, -1, -1, /* f8-ff */
64 int get_sha1_hex(const char *hex
, unsigned char *sha1
)
67 for (i
= 0; i
< 20; i
++) {
68 unsigned int val
= (hexval(hex
[0]) << 4) | hexval(hex
[1]);
77 int safe_create_leading_directories(char *path
)
86 pos
= strchr(pos
, '/');
90 if (!stat(path
, &st
)) {
92 if (!S_ISDIR(st
.st_mode
)) {
97 else if (mkdir(path
, 0777)) {
101 else if (adjust_shared_perm(path
)) {
110 char * sha1_to_hex(const unsigned char *sha1
)
113 static char hexbuffer
[4][50];
114 static const char hex
[] = "0123456789abcdef";
115 char *buffer
= hexbuffer
[3 & ++bufno
], *buf
= buffer
;
118 for (i
= 0; i
< 20; i
++) {
119 unsigned int val
= *sha1
++;
120 *buf
++ = hex
[val
>> 4];
121 *buf
++ = hex
[val
& 0xf];
128 static void fill_sha1_path(char *pathbuf
, const unsigned char *sha1
)
131 for (i
= 0; i
< 20; i
++) {
132 static char hex
[] = "0123456789abcdef";
133 unsigned int val
= sha1
[i
];
134 char *pos
= pathbuf
+ i
*2 + (i
> 0);
135 *pos
++ = hex
[val
>> 4];
136 *pos
= hex
[val
& 0xf];
141 * NOTE! This returns a statically allocated buffer, so you have to be
142 * careful about using it. Do a "xstrdup()" if you need to save the
145 * Also note that this returns the location for creating. Reading
146 * SHA1 file can happen from any alternate directory listed in the
147 * DB_ENVIRONMENT environment variable if it is not found in
148 * the primary object database.
150 char *sha1_file_name(const unsigned char *sha1
)
152 static char *name
, *base
;
155 const char *sha1_file_directory
= get_object_directory();
156 int len
= strlen(sha1_file_directory
);
157 base
= xmalloc(len
+ 60);
158 memcpy(base
, sha1_file_directory
, len
);
159 memset(base
+len
, 0, 60);
162 name
= base
+ len
+ 1;
164 fill_sha1_path(name
, sha1
);
168 char *sha1_pack_name(const unsigned char *sha1
)
170 static const char hex
[] = "0123456789abcdef";
171 static char *name
, *base
, *buf
;
175 const char *sha1_file_directory
= get_object_directory();
176 int len
= strlen(sha1_file_directory
);
177 base
= xmalloc(len
+ 60);
178 sprintf(base
, "%s/pack/pack-1234567890123456789012345678901234567890.pack", sha1_file_directory
);
179 name
= base
+ len
+ 11;
184 for (i
= 0; i
< 20; i
++) {
185 unsigned int val
= *sha1
++;
186 *buf
++ = hex
[val
>> 4];
187 *buf
++ = hex
[val
& 0xf];
193 char *sha1_pack_index_name(const unsigned char *sha1
)
195 static const char hex
[] = "0123456789abcdef";
196 static char *name
, *base
, *buf
;
200 const char *sha1_file_directory
= get_object_directory();
201 int len
= strlen(sha1_file_directory
);
202 base
= xmalloc(len
+ 60);
203 sprintf(base
, "%s/pack/pack-1234567890123456789012345678901234567890.idx", sha1_file_directory
);
204 name
= base
+ len
+ 11;
209 for (i
= 0; i
< 20; i
++) {
210 unsigned int val
= *sha1
++;
211 *buf
++ = hex
[val
>> 4];
212 *buf
++ = hex
[val
& 0xf];
218 struct alternate_object_database
*alt_odb_list
;
219 static struct alternate_object_database
**alt_odb_tail
;
221 static void read_info_alternates(const char * alternates
, int depth
);
224 * Prepare alternate object database registry.
226 * The variable alt_odb_list points at the list of struct
227 * alternate_object_database. The elements on this list come from
228 * non-empty elements from colon separated ALTERNATE_DB_ENVIRONMENT
229 * environment variable, and $GIT_OBJECT_DIRECTORY/info/alternates,
230 * whose contents is similar to that environment variable but can be
231 * LF separated. Its base points at a statically allocated buffer that
232 * contains "/the/directory/corresponding/to/.git/objects/...", while
233 * its name points just after the slash at the end of ".git/objects/"
234 * in the example above, and has enough space to hold 40-byte hex
235 * SHA1, an extra slash for the first level indirection, and the
238 static int link_alt_odb_entry(const char * entry
, int len
, const char * relative_base
, int depth
)
241 const char *objdir
= get_object_directory();
242 struct alternate_object_database
*ent
;
243 struct alternate_object_database
*alt
;
244 /* 43 = 40-byte + 2 '/' + terminating NUL */
246 int entlen
= pfxlen
+ 43;
249 if (*entry
!= '/' && relative_base
) {
250 /* Relative alt-odb */
252 base_len
= strlen(relative_base
) + 1;
256 ent
= xmalloc(sizeof(*ent
) + entlen
);
258 if (*entry
!= '/' && relative_base
) {
259 memcpy(ent
->base
, relative_base
, base_len
- 1);
260 ent
->base
[base_len
- 1] = '/';
261 memcpy(ent
->base
+ base_len
, entry
, len
);
264 memcpy(ent
->base
, entry
, pfxlen
);
266 ent
->name
= ent
->base
+ pfxlen
+ 1;
267 ent
->base
[pfxlen
+ 3] = '/';
268 ent
->base
[pfxlen
] = ent
->base
[entlen
-1] = 0;
270 /* Detect cases where alternate disappeared */
271 if (stat(ent
->base
, &st
) || !S_ISDIR(st
.st_mode
)) {
272 error("object directory %s does not exist; "
273 "check .git/objects/info/alternates.",
279 /* Prevent the common mistake of listing the same
280 * thing twice, or object directory itself.
282 for (alt
= alt_odb_list
; alt
; alt
= alt
->next
) {
283 if (!memcmp(ent
->base
, alt
->base
, pfxlen
)) {
288 if (!memcmp(ent
->base
, objdir
, pfxlen
)) {
293 /* add the alternate entry */
295 alt_odb_tail
= &(ent
->next
);
298 /* recursively add alternates */
299 read_info_alternates(ent
->base
, depth
+ 1);
301 ent
->base
[pfxlen
] = '/';
306 static void link_alt_odb_entries(const char *alt
, const char *ep
, int sep
,
307 const char *relative_base
, int depth
)
309 const char *cp
, *last
;
312 error("%s: ignoring alternate object stores, nesting too deep.",
320 if (cp
< ep
&& *cp
== '#') {
321 while (cp
< ep
&& *cp
!= sep
)
326 while (cp
< ep
&& *cp
!= sep
)
329 if ((*last
!= '/') && depth
) {
330 error("%s: ignoring relative alternate object store %s",
331 relative_base
, last
);
333 link_alt_odb_entry(last
, cp
- last
,
334 relative_base
, depth
);
337 while (cp
< ep
&& *cp
== sep
)
343 static void read_info_alternates(const char * relative_base
, int depth
)
350 sprintf(path
, "%s/info/alternates", relative_base
);
351 fd
= open(path
, O_RDONLY
);
354 if (fstat(fd
, &st
) || (st
.st_size
== 0)) {
358 map
= mmap(NULL
, st
.st_size
, PROT_READ
, MAP_PRIVATE
, fd
, 0);
360 if (map
== MAP_FAILED
)
363 link_alt_odb_entries(map
, map
+ st
.st_size
, '\n', relative_base
, depth
);
365 munmap(map
, st
.st_size
);
368 void prepare_alt_odb(void)
372 alt
= getenv(ALTERNATE_DB_ENVIRONMENT
);
377 alt_odb_tail
= &alt_odb_list
;
378 link_alt_odb_entries(alt
, alt
+ strlen(alt
), ':', NULL
, 0);
380 read_info_alternates(get_object_directory(), 0);
383 static char *find_sha1_file(const unsigned char *sha1
, struct stat
*st
)
385 char *name
= sha1_file_name(sha1
);
386 struct alternate_object_database
*alt
;
391 for (alt
= alt_odb_list
; alt
; alt
= alt
->next
) {
393 fill_sha1_path(name
, sha1
);
394 if (!stat(alt
->base
, st
))
400 static unsigned int pack_used_ctr
;
401 static size_t pack_mapped
;
402 static size_t page_size
;
403 struct packed_git
*packed_git
;
405 static int check_packed_git_idx(const char *path
, unsigned long *idx_size_
,
410 unsigned long idx_size
;
412 int fd
= open(path
, O_RDONLY
);
416 if (fstat(fd
, &st
)) {
420 idx_size
= st
.st_size
;
421 idx_map
= mmap(NULL
, idx_size
, PROT_READ
, MAP_PRIVATE
, fd
, 0);
423 if (idx_map
== MAP_FAILED
)
428 *idx_size_
= idx_size
;
430 /* check index map */
431 if (idx_size
< 4*256 + 20 + 20)
432 return error("index file too small");
434 for (i
= 0; i
< 256; i
++) {
435 unsigned int n
= ntohl(index
[i
]);
437 return error("non-monotonic index");
443 * - 256 index entries 4 bytes each
444 * - 24-byte entries * nr (20-byte sha1 + 4-byte offset)
445 * - 20-byte SHA1 of the packfile
446 * - 20-byte SHA1 file checksum
448 if (idx_size
!= 4*256 + nr
* 24 + 20 + 20)
449 return error("wrong index file size");
454 static int unuse_one_window(void)
456 struct packed_git
*p
, *lru_p
= NULL
;
457 struct pack_window
*w
, *w_l
, *lru_w
= NULL
, *lru_l
= NULL
;
459 for (p
= packed_git
; p
; p
= p
->next
) {
460 for (w_l
= NULL
, w
= p
->windows
; w
; w
= w
->next
) {
462 if (!lru_w
|| w
->last_used
< lru_w
->last_used
) {
472 munmap(lru_w
->base
, lru_w
->len
);
473 pack_mapped
-= lru_w
->len
;
475 lru_l
->next
= lru_w
->next
;
477 lru_p
->windows
= lru_w
->next
;
478 if (!lru_p
->windows
) {
479 close(lru_p
->pack_fd
);
489 void unuse_pack(struct pack_window
**w_cursor
)
491 struct pack_window
*w
= *w_cursor
;
498 static void open_packed_git(struct packed_git
*p
)
501 struct pack_header hdr
;
502 unsigned char sha1
[20];
503 unsigned char *idx_sha1
;
505 p
->pack_fd
= open(p
->pack_name
, O_RDONLY
);
506 if (p
->pack_fd
< 0 || fstat(p
->pack_fd
, &st
))
507 die("packfile %s cannot be opened", p
->pack_name
);
509 /* If we created the struct before we had the pack we lack size. */
511 if (!S_ISREG(st
.st_mode
))
512 die("packfile %s not a regular file", p
->pack_name
);
513 p
->pack_size
= st
.st_size
;
514 } else if (p
->pack_size
!= st
.st_size
)
515 die("packfile %s size changed", p
->pack_name
);
517 /* Verify we recognize this pack file format. */
518 read_or_die(p
->pack_fd
, &hdr
, sizeof(hdr
));
519 if (hdr
.hdr_signature
!= htonl(PACK_SIGNATURE
))
520 die("file %s is not a GIT packfile", p
->pack_name
);
521 if (!pack_version_ok(hdr
.hdr_version
))
522 die("packfile %s is version %u and not supported"
523 " (try upgrading GIT to a newer version)",
524 p
->pack_name
, ntohl(hdr
.hdr_version
));
526 /* Verify the pack matches its index. */
527 if (num_packed_objects(p
) != ntohl(hdr
.hdr_entries
))
528 die("packfile %s claims to have %u objects"
529 " while index size indicates %u objects",
530 p
->pack_name
, ntohl(hdr
.hdr_entries
),
531 num_packed_objects(p
));
532 if (lseek(p
->pack_fd
, p
->pack_size
- sizeof(sha1
), SEEK_SET
) == -1)
533 die("end of packfile %s is unavailable", p
->pack_name
);
534 read_or_die(p
->pack_fd
, sha1
, sizeof(sha1
));
535 idx_sha1
= ((unsigned char *)p
->index_base
) + p
->index_size
- 40;
536 if (hashcmp(sha1
, idx_sha1
))
537 die("packfile %s does not match index", p
->pack_name
);
540 static int in_window(struct pack_window
*win
, unsigned long offset
)
542 /* We must promise at least 20 bytes (one hash) after the
543 * offset is available from this window, otherwise the offset
544 * is not actually in this window and a different window (which
545 * has that one hash excess) must be used. This is to support
546 * the object header and delta base parsing routines below.
548 off_t win_off
= win
->offset
;
549 return win_off
<= offset
550 && (offset
+ 20) <= (win_off
+ win
->len
);
553 unsigned char* use_pack(struct packed_git
*p
,
554 struct pack_window
**w_cursor
,
555 unsigned long offset
,
558 struct pack_window
*win
= *w_cursor
;
560 if (p
->pack_fd
== -1)
563 /* Since packfiles end in a hash of their content and its
564 * pointless to ask for an offset into the middle of that
565 * hash, and the in_window function above wouldn't match
566 * don't allow an offset too close to the end of the file.
568 if (offset
> (p
->pack_size
- 20))
569 die("offset beyond end of packfile (truncated pack?)");
571 if (!win
|| !in_window(win
, offset
)) {
574 for (win
= p
->windows
; win
; win
= win
->next
) {
575 if (in_window(win
, offset
))
580 page_size
= getpagesize();
581 win
= xcalloc(1, sizeof(*win
));
582 win
->offset
= (offset
/ page_size
) * page_size
;
583 win
->len
= p
->pack_size
- win
->offset
;
584 if (win
->len
> packed_git_window_size
)
585 win
->len
= packed_git_window_size
;
586 pack_mapped
+= win
->len
;
587 while (packed_git_limit
< pack_mapped
&& unuse_one_window())
589 win
->base
= mmap(NULL
, win
->len
,
590 PROT_READ
, MAP_PRIVATE
,
591 p
->pack_fd
, win
->offset
);
592 if (win
->base
== MAP_FAILED
)
593 die("packfile %s cannot be mapped.", p
->pack_name
);
594 win
->next
= p
->windows
;
598 if (win
!= *w_cursor
) {
599 win
->last_used
= pack_used_ctr
++;
603 offset
-= win
->offset
;
605 *left
= win
->len
- offset
;
606 return win
->base
+ offset
;
609 struct packed_git
*add_packed_git(char *path
, int path_len
, int local
)
612 struct packed_git
*p
;
613 unsigned long idx_size
;
615 unsigned char sha1
[20];
617 if (check_packed_git_idx(path
, &idx_size
, &idx_map
))
620 /* do we have a corresponding .pack file? */
621 strcpy(path
+ path_len
- 4, ".pack");
622 if (stat(path
, &st
) || !S_ISREG(st
.st_mode
)) {
623 munmap(idx_map
, idx_size
);
626 /* ok, it looks sane as far as we can check without
627 * actually mapping the pack file.
629 p
= xmalloc(sizeof(*p
) + path_len
+ 2);
630 strcpy(p
->pack_name
, path
);
631 p
->index_size
= idx_size
;
632 p
->pack_size
= st
.st_size
;
633 p
->index_base
= idx_map
;
637 p
->pack_local
= local
;
638 if ((path_len
> 44) && !get_sha1_hex(path
+ path_len
- 44, sha1
))
639 hashcpy(p
->sha1
, sha1
);
643 struct packed_git
*parse_pack_index(unsigned char *sha1
)
645 char *path
= sha1_pack_index_name(sha1
);
646 return parse_pack_index_file(sha1
, path
);
649 struct packed_git
*parse_pack_index_file(const unsigned char *sha1
, char *idx_path
)
651 struct packed_git
*p
;
652 unsigned long idx_size
;
656 if (check_packed_git_idx(idx_path
, &idx_size
, &idx_map
))
659 path
= sha1_pack_name(sha1
);
661 p
= xmalloc(sizeof(*p
) + strlen(path
) + 2);
662 strcpy(p
->pack_name
, path
);
663 p
->index_size
= idx_size
;
665 p
->index_base
= idx_map
;
669 hashcpy(p
->sha1
, sha1
);
673 void install_packed_git(struct packed_git
*pack
)
675 pack
->next
= packed_git
;
679 static void prepare_packed_git_one(char *objdir
, int local
)
686 sprintf(path
, "%s/pack", objdir
);
691 error("unable to open object pack directory: %s: %s",
692 path
, strerror(errno
));
696 while ((de
= readdir(dir
)) != NULL
) {
697 int namelen
= strlen(de
->d_name
);
698 struct packed_git
*p
;
700 if (!has_extension(de
->d_name
, ".idx"))
703 /* we have .idx. Is it a file we can map? */
704 strcpy(path
+ len
, de
->d_name
);
705 for (p
= packed_git
; p
; p
= p
->next
) {
706 if (!memcmp(path
, p
->pack_name
, len
+ namelen
- 4))
711 p
= add_packed_git(path
, len
+ namelen
, local
);
714 p
->next
= packed_git
;
720 static int prepare_packed_git_run_once
= 0;
721 void prepare_packed_git(void)
723 struct alternate_object_database
*alt
;
725 if (prepare_packed_git_run_once
)
727 prepare_packed_git_one(get_object_directory(), 1);
729 for (alt
= alt_odb_list
; alt
; alt
= alt
->next
) {
731 prepare_packed_git_one(alt
->base
, 0);
734 prepare_packed_git_run_once
= 1;
737 void reprepare_packed_git(void)
739 prepare_packed_git_run_once
= 0;
740 prepare_packed_git();
743 int check_sha1_signature(const unsigned char *sha1
, void *map
, unsigned long size
, const char *type
)
745 unsigned char real_sha1
[20];
746 hash_sha1_file(map
, size
, type
, real_sha1
);
747 return hashcmp(sha1
, real_sha1
) ? -1 : 0;
750 void *map_sha1_file(const unsigned char *sha1
, unsigned long *size
)
755 char *filename
= find_sha1_file(sha1
, &st
);
761 fd
= open(filename
, O_RDONLY
| sha1_file_open_flag
);
763 /* See if it works without O_NOATIME */
764 switch (sha1_file_open_flag
) {
766 fd
= open(filename
, O_RDONLY
);
774 /* If it failed once, it will probably fail again.
775 * Stop using O_NOATIME
777 sha1_file_open_flag
= 0;
779 map
= mmap(NULL
, st
.st_size
, PROT_READ
, MAP_PRIVATE
, fd
, 0);
781 if (map
== MAP_FAILED
)
787 int legacy_loose_object(unsigned char *map
)
792 * Is it a zlib-compressed buffer? If so, the first byte
793 * must be 0x78 (15-bit window size, deflated), and the
794 * first 16-bit word is evenly divisible by 31
796 word
= (map
[0] << 8) + map
[1];
797 if (map
[0] == 0x78 && !(word
% 31))
803 unsigned long unpack_object_header_gently(const unsigned char *buf
, unsigned long len
, enum object_type
*type
, unsigned long *sizep
)
808 unsigned long used
= 0;
811 *type
= (c
>> 4) & 7;
817 if (sizeof(long) * 8 <= shift
)
820 size
+= (c
& 0x7f) << shift
;
827 static int unpack_sha1_header(z_stream
*stream
, unsigned char *map
, unsigned long mapsize
, void *buffer
, unsigned long bufsiz
)
829 unsigned long size
, used
;
830 static const char valid_loose_object_type
[8] = {
832 1, 1, 1, 1, /* "commit", "tree", "blob", "tag" */
833 0, /* "delta" and others are invalid in a loose object */
835 enum object_type type
;
837 /* Get the data stream */
838 memset(stream
, 0, sizeof(*stream
));
839 stream
->next_in
= map
;
840 stream
->avail_in
= mapsize
;
841 stream
->next_out
= buffer
;
842 stream
->avail_out
= bufsiz
;
844 if (legacy_loose_object(map
)) {
846 return inflate(stream
, 0);
849 used
= unpack_object_header_gently(map
, mapsize
, &type
, &size
);
850 if (!used
|| !valid_loose_object_type
[type
])
855 /* Set up the stream for the rest.. */
856 stream
->next_in
= map
;
857 stream
->avail_in
= mapsize
;
860 /* And generate the fake traditional header */
861 stream
->total_out
= 1 + snprintf(buffer
, bufsiz
, "%s %lu",
862 type_names
[type
], size
);
866 static void *unpack_sha1_rest(z_stream
*stream
, void *buffer
, unsigned long size
)
868 int bytes
= strlen(buffer
) + 1;
869 unsigned char *buf
= xmalloc(1+size
);
872 n
= stream
->total_out
- bytes
;
875 memcpy(buf
, (char *) buffer
+ bytes
, n
);
878 stream
->next_out
= buf
+ bytes
;
879 stream
->avail_out
= size
- bytes
;
880 while (inflate(stream
, Z_FINISH
) == Z_OK
)
889 * We used to just use "sscanf()", but that's actually way
890 * too permissive for what we want to check. So do an anal
891 * object header parse by hand.
893 static int parse_sha1_header(char *hdr
, char *type
, unsigned long *sizep
)
899 * The type can be at most ten bytes (including the
900 * terminating '\0' that we add), and is followed by
915 * The length must follow immediately, and be in canonical
916 * decimal format (ie "010" is not valid).
923 unsigned long c
= *hdr
- '0';
927 size
= size
* 10 + c
;
933 * The length must be followed by a zero byte
935 return *hdr
? -1 : 0;
938 void * unpack_sha1_file(void *map
, unsigned long mapsize
, char *type
, unsigned long *size
)
944 ret
= unpack_sha1_header(&stream
, map
, mapsize
, hdr
, sizeof(hdr
));
945 if (ret
< Z_OK
|| parse_sha1_header(hdr
, type
, size
) < 0)
948 return unpack_sha1_rest(&stream
, hdr
, *size
);
951 static unsigned long get_delta_base(struct packed_git
*p
,
952 struct pack_window
**w_curs
,
953 unsigned long offset
,
954 enum object_type kind
,
955 unsigned long delta_obj_offset
,
956 unsigned long *base_obj_offset
)
958 unsigned char *base_info
= use_pack(p
, w_curs
, offset
, NULL
);
959 unsigned long base_offset
;
961 /* use_pack() assured us we have [base_info, base_info + 20)
962 * as a range that we can look at without walking off the
963 * end of the mapped window. Its actually the hash size
964 * that is assured. An OFS_DELTA longer than the hash size
965 * is stupid, as then a REF_DELTA would be smaller to store.
967 if (kind
== OBJ_OFS_DELTA
) {
969 unsigned char c
= base_info
[used
++];
970 base_offset
= c
& 127;
973 if (!base_offset
|| base_offset
& ~(~0UL >> 7))
974 die("offset value overflow for delta base object");
975 c
= base_info
[used
++];
976 base_offset
= (base_offset
<< 7) + (c
& 127);
978 base_offset
= delta_obj_offset
- base_offset
;
979 if (base_offset
>= delta_obj_offset
)
980 die("delta base offset out of bound");
982 } else if (kind
== OBJ_REF_DELTA
) {
983 /* The base entry _must_ be in the same pack */
984 base_offset
= find_pack_entry_one(base_info
, p
);
986 die("failed to find delta-pack base object %s",
987 sha1_to_hex(base_info
));
990 die("I am totally screwed");
991 *base_obj_offset
= base_offset
;
995 /* forward declaration for a mutually recursive function */
996 static int packed_object_info(struct packed_git
*p
, unsigned long offset
,
997 char *type
, unsigned long *sizep
);
999 static int packed_delta_info(struct packed_git
*p
,
1000 struct pack_window
**w_curs
,
1001 unsigned long offset
,
1002 enum object_type kind
,
1003 unsigned long obj_offset
,
1005 unsigned long *sizep
)
1007 unsigned long base_offset
;
1009 offset
= get_delta_base(p
, w_curs
, offset
, kind
,
1010 obj_offset
, &base_offset
);
1012 /* We choose to only get the type of the base object and
1013 * ignore potentially corrupt pack file that expects the delta
1014 * based on a base with a wrong size. This saves tons of
1017 if (packed_object_info(p
, base_offset
, type
, NULL
))
1018 die("cannot get info for delta-pack base");
1021 const unsigned char *data
;
1022 unsigned char delta_head
[20], *in
;
1023 unsigned long result_size
;
1027 memset(&stream
, 0, sizeof(stream
));
1028 stream
.next_out
= delta_head
;
1029 stream
.avail_out
= sizeof(delta_head
);
1031 inflateInit(&stream
);
1033 in
= use_pack(p
, w_curs
, offset
, &stream
.avail_in
);
1034 stream
.next_in
= in
;
1035 st
= inflate(&stream
, Z_FINISH
);
1036 offset
+= stream
.next_in
- in
;
1037 } while ((st
== Z_OK
|| st
== Z_BUF_ERROR
)
1038 && stream
.total_out
< sizeof(delta_head
));
1039 inflateEnd(&stream
);
1040 if ((st
!= Z_STREAM_END
) &&
1041 stream
.total_out
!= sizeof(delta_head
))
1042 die("delta data unpack-initial failed");
1044 /* Examine the initial part of the delta to figure out
1049 /* ignore base size */
1050 get_delta_hdr_size(&data
, delta_head
+sizeof(delta_head
));
1052 /* Read the result size */
1053 result_size
= get_delta_hdr_size(&data
, delta_head
+sizeof(delta_head
));
1054 *sizep
= result_size
;
1059 static unsigned long unpack_object_header(struct packed_git
*p
,
1060 struct pack_window
**w_curs
,
1061 unsigned long offset
,
1062 enum object_type
*type
,
1063 unsigned long *sizep
)
1065 unsigned char *base
;
1069 /* use_pack() assures us we have [base, base + 20) available
1070 * as a range that we can look at at. (Its actually the hash
1071 * size that is assurred.) With our object header encoding
1072 * the maximum deflated object size is 2^137, which is just
1073 * insane, so we know won't exceed what we have been given.
1075 base
= use_pack(p
, w_curs
, offset
, &left
);
1076 used
= unpack_object_header_gently(base
, left
, type
, sizep
);
1078 die("object offset outside of pack file");
1080 return offset
+ used
;
1083 void packed_object_info_detail(struct packed_git
*p
,
1084 unsigned long offset
,
1086 unsigned long *size
,
1087 unsigned long *store_size
,
1088 unsigned int *delta_chain_length
,
1089 unsigned char *base_sha1
)
1091 struct pack_window
*w_curs
= NULL
;
1092 unsigned long obj_offset
, val
;
1093 unsigned char *next_sha1
;
1094 enum object_type kind
;
1096 *delta_chain_length
= 0;
1097 obj_offset
= offset
;
1098 offset
= unpack_object_header(p
, &w_curs
, offset
, &kind
, size
);
1103 die("pack %s contains unknown object type %d",
1104 p
->pack_name
, kind
);
1109 strcpy(type
, type_names
[kind
]);
1110 *store_size
= 0; /* notyet */
1111 unuse_pack(&w_curs
);
1114 get_delta_base(p
, &w_curs
, offset
, kind
,
1115 obj_offset
, &offset
);
1116 if (*delta_chain_length
== 0) {
1117 /* TODO: find base_sha1 as pointed by offset */
1121 next_sha1
= use_pack(p
, &w_curs
, offset
, NULL
);
1122 if (*delta_chain_length
== 0)
1123 hashcpy(base_sha1
, next_sha1
);
1124 offset
= find_pack_entry_one(next_sha1
, p
);
1127 obj_offset
= offset
;
1128 offset
= unpack_object_header(p
, &w_curs
, offset
, &kind
, &val
);
1129 (*delta_chain_length
)++;
1133 static int packed_object_info(struct packed_git
*p
, unsigned long offset
,
1134 char *type
, unsigned long *sizep
)
1136 struct pack_window
*w_curs
= NULL
;
1137 unsigned long size
, obj_offset
= offset
;
1138 enum object_type kind
;
1141 offset
= unpack_object_header(p
, &w_curs
, offset
, &kind
, &size
);
1146 r
= packed_delta_info(p
, &w_curs
, offset
, kind
,
1147 obj_offset
, type
, sizep
);
1148 unuse_pack(&w_curs
);
1154 strcpy(type
, type_names
[kind
]);
1155 unuse_pack(&w_curs
);
1158 die("pack %s contains unknown object type %d",
1159 p
->pack_name
, kind
);
1166 static void *unpack_compressed_entry(struct packed_git
*p
,
1167 struct pack_window
**w_curs
,
1168 unsigned long offset
,
1173 unsigned char *buffer
, *in
;
1175 buffer
= xmalloc(size
+ 1);
1177 memset(&stream
, 0, sizeof(stream
));
1178 stream
.next_out
= buffer
;
1179 stream
.avail_out
= size
;
1181 inflateInit(&stream
);
1183 in
= use_pack(p
, w_curs
, offset
, &stream
.avail_in
);
1184 stream
.next_in
= in
;
1185 st
= inflate(&stream
, Z_FINISH
);
1186 offset
+= stream
.next_in
- in
;
1187 } while (st
== Z_OK
|| st
== Z_BUF_ERROR
);
1188 inflateEnd(&stream
);
1189 if ((st
!= Z_STREAM_END
) || stream
.total_out
!= size
) {
1197 static void *unpack_delta_entry(struct packed_git
*p
,
1198 struct pack_window
**w_curs
,
1199 unsigned long offset
,
1200 unsigned long delta_size
,
1201 enum object_type kind
,
1202 unsigned long obj_offset
,
1204 unsigned long *sizep
)
1206 void *delta_data
, *result
, *base
;
1207 unsigned long result_size
, base_size
, base_offset
;
1209 offset
= get_delta_base(p
, w_curs
, offset
, kind
,
1210 obj_offset
, &base_offset
);
1211 base
= unpack_entry(p
, base_offset
, type
, &base_size
);
1213 die("failed to read delta base object at %lu from %s",
1214 base_offset
, p
->pack_name
);
1216 delta_data
= unpack_compressed_entry(p
, w_curs
, offset
, delta_size
);
1217 result
= patch_delta(base
, base_size
,
1218 delta_data
, delta_size
,
1221 die("failed to apply delta");
1224 *sizep
= result_size
;
1228 void *unpack_entry(struct packed_git
*p
, unsigned long offset
,
1229 char *type
, unsigned long *sizep
)
1231 struct pack_window
*w_curs
= NULL
;
1232 unsigned long size
, obj_offset
= offset
;
1233 enum object_type kind
;
1236 offset
= unpack_object_header(p
, &w_curs
, offset
, &kind
, &size
);
1240 retval
= unpack_delta_entry(p
, &w_curs
, offset
, size
,
1241 kind
, obj_offset
, type
, sizep
);
1247 strcpy(type
, type_names
[kind
]);
1249 retval
= unpack_compressed_entry(p
, &w_curs
, offset
, size
);
1252 die("unknown object type %i in %s", kind
, p
->pack_name
);
1254 unuse_pack(&w_curs
);
1258 int num_packed_objects(const struct packed_git
*p
)
1260 /* See check_packed_git_idx() */
1261 return (p
->index_size
- 20 - 20 - 4*256) / 24;
1264 int nth_packed_object_sha1(const struct packed_git
*p
, int n
,
1265 unsigned char* sha1
)
1267 void *index
= p
->index_base
+ 256;
1268 if (n
< 0 || num_packed_objects(p
) <= n
)
1270 hashcpy(sha1
, (unsigned char *) index
+ (24 * n
) + 4);
1274 unsigned long find_pack_entry_one(const unsigned char *sha1
,
1275 struct packed_git
*p
)
1277 unsigned int *level1_ofs
= p
->index_base
;
1278 int hi
= ntohl(level1_ofs
[*sha1
]);
1279 int lo
= ((*sha1
== 0x0) ? 0 : ntohl(level1_ofs
[*sha1
- 1]));
1280 void *index
= p
->index_base
+ 256;
1283 int mi
= (lo
+ hi
) / 2;
1284 int cmp
= hashcmp((unsigned char *)index
+ (24 * mi
) + 4, sha1
);
1286 return ntohl(*((unsigned int *) ((char *) index
+ (24 * mi
))));
1295 static int matches_pack_name(struct packed_git
*p
, const char *ig
)
1297 const char *last_c
, *c
;
1299 if (!strcmp(p
->pack_name
, ig
))
1302 for (c
= p
->pack_name
, last_c
= c
; *c
;)
1307 if (!strcmp(last_c
, ig
))
1313 static int find_pack_entry(const unsigned char *sha1
, struct pack_entry
*e
, const char **ignore_packed
)
1315 struct packed_git
*p
;
1316 unsigned long offset
;
1318 prepare_packed_git();
1320 for (p
= packed_git
; p
; p
= p
->next
) {
1321 if (ignore_packed
) {
1323 for (ig
= ignore_packed
; *ig
; ig
++)
1324 if (!matches_pack_name(p
, *ig
))
1329 offset
= find_pack_entry_one(sha1
, p
);
1333 hashcpy(e
->sha1
, sha1
);
1340 struct packed_git
*find_sha1_pack(const unsigned char *sha1
,
1341 struct packed_git
*packs
)
1343 struct packed_git
*p
;
1345 for (p
= packs
; p
; p
= p
->next
) {
1346 if (find_pack_entry_one(sha1
, p
))
1353 static int sha1_loose_object_info(const unsigned char *sha1
, char *type
, unsigned long *sizep
)
1356 unsigned long mapsize
, size
;
1361 map
= map_sha1_file(sha1
, &mapsize
);
1363 return error("unable to find %s", sha1_to_hex(sha1
));
1364 if (unpack_sha1_header(&stream
, map
, mapsize
, hdr
, sizeof(hdr
)) < 0)
1365 status
= error("unable to unpack %s header",
1367 if (parse_sha1_header(hdr
, type
, &size
) < 0)
1368 status
= error("unable to parse %s header", sha1_to_hex(sha1
));
1374 inflateEnd(&stream
);
1375 munmap(map
, mapsize
);
1379 int sha1_object_info(const unsigned char *sha1
, char *type
, unsigned long *sizep
)
1381 struct pack_entry e
;
1383 if (!find_pack_entry(sha1
, &e
, NULL
)) {
1384 reprepare_packed_git();
1385 if (!find_pack_entry(sha1
, &e
, NULL
))
1386 return sha1_loose_object_info(sha1
, type
, sizep
);
1388 return packed_object_info(e
.p
, e
.offset
, type
, sizep
);
1391 static void *read_packed_sha1(const unsigned char *sha1
, char *type
, unsigned long *size
)
1393 struct pack_entry e
;
1395 if (!find_pack_entry(sha1
, &e
, NULL
)) {
1396 error("cannot read sha1_file for %s", sha1_to_hex(sha1
));
1399 return unpack_entry(e
.p
, e
.offset
, type
, size
);
1402 void * read_sha1_file(const unsigned char *sha1
, char *type
, unsigned long *size
)
1404 unsigned long mapsize
;
1406 struct pack_entry e
;
1408 if (find_pack_entry(sha1
, &e
, NULL
))
1409 return read_packed_sha1(sha1
, type
, size
);
1410 map
= map_sha1_file(sha1
, &mapsize
);
1412 buf
= unpack_sha1_file(map
, mapsize
, type
, size
);
1413 munmap(map
, mapsize
);
1416 reprepare_packed_git();
1417 if (find_pack_entry(sha1
, &e
, NULL
))
1418 return read_packed_sha1(sha1
, type
, size
);
1422 void *read_object_with_reference(const unsigned char *sha1
,
1423 const char *required_type
,
1424 unsigned long *size
,
1425 unsigned char *actual_sha1_return
)
1429 unsigned long isize
;
1430 unsigned char actual_sha1
[20];
1432 hashcpy(actual_sha1
, sha1
);
1434 int ref_length
= -1;
1435 const char *ref_type
= NULL
;
1437 buffer
= read_sha1_file(actual_sha1
, type
, &isize
);
1440 if (!strcmp(type
, required_type
)) {
1442 if (actual_sha1_return
)
1443 hashcpy(actual_sha1_return
, actual_sha1
);
1446 /* Handle references */
1447 else if (!strcmp(type
, commit_type
))
1449 else if (!strcmp(type
, tag_type
))
1450 ref_type
= "object ";
1455 ref_length
= strlen(ref_type
);
1457 if (memcmp(buffer
, ref_type
, ref_length
) ||
1458 get_sha1_hex((char *) buffer
+ ref_length
, actual_sha1
)) {
1463 /* Now we have the ID of the referred-to object in
1464 * actual_sha1. Check again. */
1468 static void write_sha1_file_prepare(void *buf
, unsigned long len
,
1469 const char *type
, unsigned char *sha1
,
1470 unsigned char *hdr
, int *hdrlen
)
1474 /* Generate the header */
1475 *hdrlen
= sprintf((char *)hdr
, "%s %lu", type
, len
)+1;
1479 SHA1_Update(&c
, hdr
, *hdrlen
);
1480 SHA1_Update(&c
, buf
, len
);
1481 SHA1_Final(sha1
, &c
);
1485 * Link the tempfile to the final place, possibly creating the
1486 * last directory level as you do so.
1488 * Returns the errno on failure, 0 on success.
1490 static int link_temp_to_file(const char *tmpfile
, const char *filename
)
1495 if (!link(tmpfile
, filename
))
1499 * Try to mkdir the last path component if that failed.
1501 * Re-try the "link()" regardless of whether the mkdir
1502 * succeeds, since a race might mean that somebody
1506 dir
= strrchr(filename
, '/');
1509 if (!mkdir(filename
, 0777) && adjust_shared_perm(filename
)) {
1514 if (!link(tmpfile
, filename
))
1522 * Move the just written object into its final resting place
1524 int move_temp_to_file(const char *tmpfile
, const char *filename
)
1526 int ret
= link_temp_to_file(tmpfile
, filename
);
1529 * Coda hack - coda doesn't like cross-directory links,
1530 * so we fall back to a rename, which will mean that it
1531 * won't be able to check collisions, but that's not a
1534 * The same holds for FAT formatted media.
1536 * When this succeeds, we just return 0. We have nothing
1539 if (ret
&& ret
!= EEXIST
) {
1540 if (!rename(tmpfile
, filename
))
1546 if (ret
!= EEXIST
) {
1547 return error("unable to write sha1 filename %s: %s\n", filename
, strerror(ret
));
1549 /* FIXME!!! Collision check here ? */
1555 static int write_buffer(int fd
, const void *buf
, size_t len
)
1560 size
= write(fd
, buf
, len
);
1562 return error("file write: disk full");
1564 if (errno
== EINTR
|| errno
== EAGAIN
)
1566 return error("file write error (%s)", strerror(errno
));
1569 buf
= (char *) buf
+ size
;
1574 static int write_binary_header(unsigned char *hdr
, enum object_type type
, unsigned long len
)
1579 c
= (type
<< 4) | (len
& 15);
1592 static void setup_object_header(z_stream
*stream
, const char *type
, unsigned long len
)
1596 if (use_legacy_headers
) {
1597 while (deflate(stream
, 0) == Z_OK
)
1601 if (!strcmp(type
, blob_type
))
1602 obj_type
= OBJ_BLOB
;
1603 else if (!strcmp(type
, tree_type
))
1604 obj_type
= OBJ_TREE
;
1605 else if (!strcmp(type
, commit_type
))
1606 obj_type
= OBJ_COMMIT
;
1607 else if (!strcmp(type
, tag_type
))
1610 die("trying to generate bogus object of type '%s'", type
);
1611 hdr
= write_binary_header(stream
->next_out
, obj_type
, len
);
1612 stream
->total_out
= hdr
;
1613 stream
->next_out
+= hdr
;
1614 stream
->avail_out
-= hdr
;
1617 int hash_sha1_file(void *buf
, unsigned long len
, const char *type
,
1618 unsigned char *sha1
)
1620 unsigned char hdr
[50];
1622 write_sha1_file_prepare(buf
, len
, type
, sha1
, hdr
, &hdrlen
);
1626 int write_sha1_file(void *buf
, unsigned long len
, const char *type
, unsigned char *returnsha1
)
1629 unsigned char *compressed
;
1631 unsigned char sha1
[20];
1633 static char tmpfile
[PATH_MAX
];
1634 unsigned char hdr
[50];
1637 /* Normally if we have it in the pack then we do not bother writing
1638 * it out into .git/objects/??/?{38} file.
1640 write_sha1_file_prepare(buf
, len
, type
, sha1
, hdr
, &hdrlen
);
1641 filename
= sha1_file_name(sha1
);
1643 hashcpy(returnsha1
, sha1
);
1644 if (has_sha1_file(sha1
))
1646 fd
= open(filename
, O_RDONLY
);
1649 * FIXME!!! We might do collision checking here, but we'd
1650 * need to uncompress the old file and check it. Later.
1656 if (errno
!= ENOENT
) {
1657 return error("sha1 file %s: %s\n", filename
, strerror(errno
));
1660 snprintf(tmpfile
, sizeof(tmpfile
), "%s/obj_XXXXXX", get_object_directory());
1662 fd
= mkstemp(tmpfile
);
1665 return error("insufficient permission for adding an object to repository database %s\n", get_object_directory());
1667 return error("unable to create temporary sha1 filename %s: %s\n", tmpfile
, strerror(errno
));
1671 memset(&stream
, 0, sizeof(stream
));
1672 deflateInit(&stream
, zlib_compression_level
);
1673 size
= 8 + deflateBound(&stream
, len
+hdrlen
);
1674 compressed
= xmalloc(size
);
1677 stream
.next_out
= compressed
;
1678 stream
.avail_out
= size
;
1680 /* First header.. */
1681 stream
.next_in
= hdr
;
1682 stream
.avail_in
= hdrlen
;
1683 setup_object_header(&stream
, type
, len
);
1685 /* Then the data itself.. */
1686 stream
.next_in
= buf
;
1687 stream
.avail_in
= len
;
1688 while (deflate(&stream
, Z_FINISH
) == Z_OK
)
1690 deflateEnd(&stream
);
1691 size
= stream
.total_out
;
1693 if (write_buffer(fd
, compressed
, size
) < 0)
1694 die("unable to write sha1 file");
1699 return move_temp_to_file(tmpfile
, filename
);
1703 * We need to unpack and recompress the object for writing
1704 * it out to a different file.
1706 static void *repack_object(const unsigned char *sha1
, unsigned long *objsize
)
1710 unsigned char *unpacked
;
1717 /* need to unpack and recompress it by itself */
1718 unpacked
= read_packed_sha1(sha1
, type
, &len
);
1720 hdrlen
= sprintf(hdr
, "%s %lu", type
, len
) + 1;
1723 memset(&stream
, 0, sizeof(stream
));
1724 deflateInit(&stream
, zlib_compression_level
);
1725 size
= deflateBound(&stream
, len
+ hdrlen
);
1726 buf
= xmalloc(size
);
1729 stream
.next_out
= buf
;
1730 stream
.avail_out
= size
;
1732 /* First header.. */
1733 stream
.next_in
= (void *)hdr
;
1734 stream
.avail_in
= hdrlen
;
1735 while (deflate(&stream
, 0) == Z_OK
)
1738 /* Then the data itself.. */
1739 stream
.next_in
= unpacked
;
1740 stream
.avail_in
= len
;
1741 while (deflate(&stream
, Z_FINISH
) == Z_OK
)
1743 deflateEnd(&stream
);
1746 *objsize
= stream
.total_out
;
1750 int write_sha1_to_fd(int fd
, const unsigned char *sha1
)
1753 unsigned long objsize
;
1754 void *buf
= map_sha1_file(sha1
, &objsize
);
1757 retval
= write_buffer(fd
, buf
, objsize
);
1758 munmap(buf
, objsize
);
1762 buf
= repack_object(sha1
, &objsize
);
1763 retval
= write_buffer(fd
, buf
, objsize
);
1768 int write_sha1_from_fd(const unsigned char *sha1
, int fd
, char *buffer
,
1769 size_t bufsize
, size_t *bufposn
)
1771 char tmpfile
[PATH_MAX
];
1774 unsigned char real_sha1
[20];
1775 unsigned char discard
[4096];
1779 snprintf(tmpfile
, sizeof(tmpfile
), "%s/obj_XXXXXX", get_object_directory());
1781 local
= mkstemp(tmpfile
);
1784 return error("insufficient permission for adding an object to repository database %s\n", get_object_directory());
1786 return error("unable to create temporary sha1 filename %s: %s\n", tmpfile
, strerror(errno
));
1789 memset(&stream
, 0, sizeof(stream
));
1791 inflateInit(&stream
);
1798 stream
.avail_in
= *bufposn
;
1799 stream
.next_in
= (unsigned char *) buffer
;
1801 stream
.next_out
= discard
;
1802 stream
.avail_out
= sizeof(discard
);
1803 ret
= inflate(&stream
, Z_SYNC_FLUSH
);
1804 SHA1_Update(&c
, discard
, sizeof(discard
) -
1806 } while (stream
.avail_in
&& ret
== Z_OK
);
1807 if (write_buffer(local
, buffer
, *bufposn
- stream
.avail_in
) < 0)
1808 die("unable to write sha1 file");
1809 memmove(buffer
, buffer
+ *bufposn
- stream
.avail_in
,
1811 *bufposn
= stream
.avail_in
;
1815 size
= read(fd
, buffer
+ *bufposn
, bufsize
- *bufposn
);
1820 return error("Connection closed?");
1821 perror("Reading from connection");
1826 inflateEnd(&stream
);
1829 SHA1_Final(real_sha1
, &c
);
1830 if (ret
!= Z_STREAM_END
) {
1832 return error("File %s corrupted", sha1_to_hex(sha1
));
1834 if (hashcmp(sha1
, real_sha1
)) {
1836 return error("File %s has bad hash", sha1_to_hex(sha1
));
1839 return move_temp_to_file(tmpfile
, sha1_file_name(sha1
));
1842 int has_pack_index(const unsigned char *sha1
)
1845 if (stat(sha1_pack_index_name(sha1
), &st
))
1850 int has_pack_file(const unsigned char *sha1
)
1853 if (stat(sha1_pack_name(sha1
), &st
))
1858 int has_sha1_pack(const unsigned char *sha1
, const char **ignore_packed
)
1860 struct pack_entry e
;
1861 return find_pack_entry(sha1
, &e
, ignore_packed
);
1864 int has_sha1_file(const unsigned char *sha1
)
1867 struct pack_entry e
;
1869 if (find_pack_entry(sha1
, &e
, NULL
))
1871 return find_sha1_file(sha1
, &st
) ? 1 : 0;
1875 * reads from fd as long as possible into a supplied buffer of size bytes.
1876 * If necessary the buffer's size is increased using realloc()
1878 * returns 0 if anything went fine and -1 otherwise
1880 * NOTE: both buf and size may change, but even when -1 is returned
1881 * you still have to free() it yourself.
1883 int read_pipe(int fd
, char** return_buf
, unsigned long* return_size
)
1885 char* buf
= *return_buf
;
1886 unsigned long size
= *return_size
;
1888 unsigned long off
= 0;
1891 iret
= xread(fd
, buf
+ off
, size
- off
);
1896 buf
= xrealloc(buf
, size
);
1909 int index_pipe(unsigned char *sha1
, int fd
, const char *type
, int write_object
)
1911 unsigned long size
= 4096;
1912 char *buf
= xmalloc(size
);
1915 if (read_pipe(fd
, &buf
, &size
)) {
1923 ret
= write_sha1_file(buf
, size
, type
, sha1
);
1925 ret
= hash_sha1_file(buf
, size
, type
, sha1
);
1930 int index_fd(unsigned char *sha1
, int fd
, struct stat
*st
, int write_object
, const char *type
)
1932 unsigned long size
= st
->st_size
;
1938 buf
= mmap(NULL
, size
, PROT_READ
, MAP_PRIVATE
, fd
, 0);
1940 if (buf
== MAP_FAILED
)
1946 ret
= write_sha1_file(buf
, size
, type
, sha1
);
1948 ret
= hash_sha1_file(buf
, size
, type
, sha1
);
1954 int index_path(unsigned char *sha1
, const char *path
, struct stat
*st
, int write_object
)
1959 switch (st
->st_mode
& S_IFMT
) {
1961 fd
= open(path
, O_RDONLY
);
1963 return error("open(\"%s\"): %s", path
,
1965 if (index_fd(sha1
, fd
, st
, write_object
, NULL
) < 0)
1966 return error("%s: failed to insert into database",
1970 target
= xmalloc(st
->st_size
+1);
1971 if (readlink(path
, target
, st
->st_size
+1) != st
->st_size
) {
1972 char *errstr
= strerror(errno
);
1974 return error("readlink(\"%s\"): %s", path
,
1978 hash_sha1_file(target
, st
->st_size
, blob_type
, sha1
);
1979 else if (write_sha1_file(target
, st
->st_size
, blob_type
, sha1
))
1980 return error("%s: failed to insert into database",
1985 return error("%s: unsupported file type", path
);