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 unsigned int pack_mmap_calls
;
402 static unsigned int peak_pack_open_windows
;
403 static unsigned int pack_open_windows
;
404 static size_t peak_pack_mapped
;
405 static size_t pack_mapped
;
406 static size_t page_size
;
407 struct packed_git
*packed_git
;
412 "pack_report: getpagesize() = %10lu\n"
413 "pack_report: core.packedGitWindowSize = %10lu\n"
414 "pack_report: core.packedGitLimit = %10lu\n",
416 packed_git_window_size
,
419 "pack_report: pack_used_ctr = %10u\n"
420 "pack_report: pack_mmap_calls = %10u\n"
421 "pack_report: pack_open_windows = %10u / %10u\n"
422 "pack_report: pack_mapped = %10lu / %10lu\n",
425 pack_open_windows
, peak_pack_open_windows
,
426 pack_mapped
, peak_pack_mapped
);
429 static int check_packed_git_idx(const char *path
, unsigned long *idx_size_
,
434 unsigned long idx_size
;
436 int fd
= open(path
, O_RDONLY
);
440 if (fstat(fd
, &st
)) {
444 idx_size
= st
.st_size
;
445 idx_map
= mmap(NULL
, idx_size
, PROT_READ
, MAP_PRIVATE
, fd
, 0);
447 if (idx_map
== MAP_FAILED
)
452 *idx_size_
= idx_size
;
454 /* check index map */
455 if (idx_size
< 4*256 + 20 + 20)
456 return error("index file too small");
458 for (i
= 0; i
< 256; i
++) {
459 unsigned int n
= ntohl(index
[i
]);
461 return error("non-monotonic index");
467 * - 256 index entries 4 bytes each
468 * - 24-byte entries * nr (20-byte sha1 + 4-byte offset)
469 * - 20-byte SHA1 of the packfile
470 * - 20-byte SHA1 file checksum
472 if (idx_size
!= 4*256 + nr
* 24 + 20 + 20)
473 return error("wrong index file size");
478 static void scan_windows(struct packed_git
*p
,
479 struct packed_git
**lru_p
,
480 struct pack_window
**lru_w
,
481 struct pack_window
**lru_l
)
483 struct pack_window
*w
, *w_l
;
485 for (w_l
= NULL
, w
= p
->windows
; w
; w
= w
->next
) {
487 if (!*lru_w
|| w
->last_used
< (*lru_w
)->last_used
) {
497 static int unuse_one_window(struct packed_git
*current
)
499 struct packed_git
*p
, *lru_p
= NULL
;
500 struct pack_window
*lru_w
= NULL
, *lru_l
= NULL
;
503 scan_windows(current
, &lru_p
, &lru_w
, &lru_l
);
504 for (p
= packed_git
; p
; p
= p
->next
)
505 scan_windows(p
, &lru_p
, &lru_w
, &lru_l
);
507 munmap(lru_w
->base
, lru_w
->len
);
508 pack_mapped
-= lru_w
->len
;
510 lru_l
->next
= lru_w
->next
;
512 lru_p
->windows
= lru_w
->next
;
513 if (!lru_p
->windows
&& lru_p
!= current
) {
514 close(lru_p
->pack_fd
);
525 void unuse_pack(struct pack_window
**w_cursor
)
527 struct pack_window
*w
= *w_cursor
;
534 static void open_packed_git(struct packed_git
*p
)
537 struct pack_header hdr
;
538 unsigned char sha1
[20];
539 unsigned char *idx_sha1
;
541 p
->pack_fd
= open(p
->pack_name
, O_RDONLY
);
542 if (p
->pack_fd
< 0 || fstat(p
->pack_fd
, &st
))
543 die("packfile %s cannot be opened", p
->pack_name
);
545 /* If we created the struct before we had the pack we lack size. */
547 if (!S_ISREG(st
.st_mode
))
548 die("packfile %s not a regular file", p
->pack_name
);
549 p
->pack_size
= st
.st_size
;
550 } else if (p
->pack_size
!= st
.st_size
)
551 die("packfile %s size changed", p
->pack_name
);
553 /* Verify we recognize this pack file format. */
554 read_or_die(p
->pack_fd
, &hdr
, sizeof(hdr
));
555 if (hdr
.hdr_signature
!= htonl(PACK_SIGNATURE
))
556 die("file %s is not a GIT packfile", p
->pack_name
);
557 if (!pack_version_ok(hdr
.hdr_version
))
558 die("packfile %s is version %u and not supported"
559 " (try upgrading GIT to a newer version)",
560 p
->pack_name
, ntohl(hdr
.hdr_version
));
562 /* Verify the pack matches its index. */
563 if (num_packed_objects(p
) != ntohl(hdr
.hdr_entries
))
564 die("packfile %s claims to have %u objects"
565 " while index size indicates %u objects",
566 p
->pack_name
, ntohl(hdr
.hdr_entries
),
567 num_packed_objects(p
));
568 if (lseek(p
->pack_fd
, p
->pack_size
- sizeof(sha1
), SEEK_SET
) == -1)
569 die("end of packfile %s is unavailable", p
->pack_name
);
570 read_or_die(p
->pack_fd
, sha1
, sizeof(sha1
));
571 idx_sha1
= ((unsigned char *)p
->index_base
) + p
->index_size
- 40;
572 if (hashcmp(sha1
, idx_sha1
))
573 die("packfile %s does not match index", p
->pack_name
);
576 static int in_window(struct pack_window
*win
, unsigned long offset
)
578 /* We must promise at least 20 bytes (one hash) after the
579 * offset is available from this window, otherwise the offset
580 * is not actually in this window and a different window (which
581 * has that one hash excess) must be used. This is to support
582 * the object header and delta base parsing routines below.
584 off_t win_off
= win
->offset
;
585 return win_off
<= offset
586 && (offset
+ 20) <= (win_off
+ win
->len
);
589 unsigned char* use_pack(struct packed_git
*p
,
590 struct pack_window
**w_cursor
,
591 unsigned long offset
,
594 struct pack_window
*win
= *w_cursor
;
596 if (p
->pack_fd
== -1)
599 /* Since packfiles end in a hash of their content and its
600 * pointless to ask for an offset into the middle of that
601 * hash, and the in_window function above wouldn't match
602 * don't allow an offset too close to the end of the file.
604 if (offset
> (p
->pack_size
- 20))
605 die("offset beyond end of packfile (truncated pack?)");
607 if (!win
|| !in_window(win
, offset
)) {
610 for (win
= p
->windows
; win
; win
= win
->next
) {
611 if (in_window(win
, offset
))
616 page_size
= getpagesize();
617 win
= xcalloc(1, sizeof(*win
));
618 win
->offset
= (offset
/ page_size
) * page_size
;
619 win
->len
= p
->pack_size
- win
->offset
;
620 if (win
->len
> packed_git_window_size
)
621 win
->len
= packed_git_window_size
;
622 pack_mapped
+= win
->len
;
623 while (packed_git_limit
< pack_mapped
624 && unuse_one_window(p
))
626 win
->base
= mmap(NULL
, win
->len
,
627 PROT_READ
, MAP_PRIVATE
,
628 p
->pack_fd
, win
->offset
);
629 if (win
->base
== MAP_FAILED
)
630 die("packfile %s cannot be mapped: %s",
635 if (pack_mapped
> peak_pack_mapped
)
636 peak_pack_mapped
= pack_mapped
;
637 if (pack_open_windows
> peak_pack_open_windows
)
638 peak_pack_open_windows
= pack_open_windows
;
639 win
->next
= p
->windows
;
643 if (win
!= *w_cursor
) {
644 win
->last_used
= pack_used_ctr
++;
648 offset
-= win
->offset
;
650 *left
= win
->len
- offset
;
651 return win
->base
+ offset
;
654 struct packed_git
*add_packed_git(char *path
, int path_len
, int local
)
657 struct packed_git
*p
;
658 unsigned long idx_size
;
660 unsigned char sha1
[20];
662 if (check_packed_git_idx(path
, &idx_size
, &idx_map
))
665 /* do we have a corresponding .pack file? */
666 strcpy(path
+ path_len
- 4, ".pack");
667 if (stat(path
, &st
) || !S_ISREG(st
.st_mode
)) {
668 munmap(idx_map
, idx_size
);
671 /* ok, it looks sane as far as we can check without
672 * actually mapping the pack file.
674 p
= xmalloc(sizeof(*p
) + path_len
+ 2);
675 strcpy(p
->pack_name
, path
);
676 p
->index_size
= idx_size
;
677 p
->pack_size
= st
.st_size
;
678 p
->index_base
= idx_map
;
682 p
->pack_local
= local
;
683 if ((path_len
> 44) && !get_sha1_hex(path
+ path_len
- 44, sha1
))
684 hashcpy(p
->sha1
, sha1
);
688 struct packed_git
*parse_pack_index(unsigned char *sha1
)
690 char *path
= sha1_pack_index_name(sha1
);
691 return parse_pack_index_file(sha1
, path
);
694 struct packed_git
*parse_pack_index_file(const unsigned char *sha1
, char *idx_path
)
696 struct packed_git
*p
;
697 unsigned long idx_size
;
701 if (check_packed_git_idx(idx_path
, &idx_size
, &idx_map
))
704 path
= sha1_pack_name(sha1
);
706 p
= xmalloc(sizeof(*p
) + strlen(path
) + 2);
707 strcpy(p
->pack_name
, path
);
708 p
->index_size
= idx_size
;
710 p
->index_base
= idx_map
;
714 hashcpy(p
->sha1
, sha1
);
718 void install_packed_git(struct packed_git
*pack
)
720 pack
->next
= packed_git
;
724 static void prepare_packed_git_one(char *objdir
, int local
)
731 sprintf(path
, "%s/pack", objdir
);
736 error("unable to open object pack directory: %s: %s",
737 path
, strerror(errno
));
741 while ((de
= readdir(dir
)) != NULL
) {
742 int namelen
= strlen(de
->d_name
);
743 struct packed_git
*p
;
745 if (!has_extension(de
->d_name
, ".idx"))
748 /* we have .idx. Is it a file we can map? */
749 strcpy(path
+ len
, de
->d_name
);
750 for (p
= packed_git
; p
; p
= p
->next
) {
751 if (!memcmp(path
, p
->pack_name
, len
+ namelen
- 4))
756 p
= add_packed_git(path
, len
+ namelen
, local
);
759 p
->next
= packed_git
;
765 static int prepare_packed_git_run_once
= 0;
766 void prepare_packed_git(void)
768 struct alternate_object_database
*alt
;
770 if (prepare_packed_git_run_once
)
772 prepare_packed_git_one(get_object_directory(), 1);
774 for (alt
= alt_odb_list
; alt
; alt
= alt
->next
) {
776 prepare_packed_git_one(alt
->base
, 0);
779 prepare_packed_git_run_once
= 1;
782 void reprepare_packed_git(void)
784 prepare_packed_git_run_once
= 0;
785 prepare_packed_git();
788 int check_sha1_signature(const unsigned char *sha1
, void *map
, unsigned long size
, const char *type
)
790 unsigned char real_sha1
[20];
791 hash_sha1_file(map
, size
, type
, real_sha1
);
792 return hashcmp(sha1
, real_sha1
) ? -1 : 0;
795 void *map_sha1_file(const unsigned char *sha1
, unsigned long *size
)
800 char *filename
= find_sha1_file(sha1
, &st
);
806 fd
= open(filename
, O_RDONLY
| sha1_file_open_flag
);
808 /* See if it works without O_NOATIME */
809 switch (sha1_file_open_flag
) {
811 fd
= open(filename
, O_RDONLY
);
819 /* If it failed once, it will probably fail again.
820 * Stop using O_NOATIME
822 sha1_file_open_flag
= 0;
824 map
= mmap(NULL
, st
.st_size
, PROT_READ
, MAP_PRIVATE
, fd
, 0);
826 if (map
== MAP_FAILED
)
832 int legacy_loose_object(unsigned char *map
)
837 * Is it a zlib-compressed buffer? If so, the first byte
838 * must be 0x78 (15-bit window size, deflated), and the
839 * first 16-bit word is evenly divisible by 31
841 word
= (map
[0] << 8) + map
[1];
842 if (map
[0] == 0x78 && !(word
% 31))
848 unsigned long unpack_object_header_gently(const unsigned char *buf
, unsigned long len
, enum object_type
*type
, unsigned long *sizep
)
853 unsigned long used
= 0;
856 *type
= (c
>> 4) & 7;
862 if (sizeof(long) * 8 <= shift
)
865 size
+= (c
& 0x7f) << shift
;
872 static int unpack_sha1_header(z_stream
*stream
, unsigned char *map
, unsigned long mapsize
, void *buffer
, unsigned long bufsiz
)
874 unsigned long size
, used
;
875 static const char valid_loose_object_type
[8] = {
877 1, 1, 1, 1, /* "commit", "tree", "blob", "tag" */
878 0, /* "delta" and others are invalid in a loose object */
880 enum object_type type
;
882 /* Get the data stream */
883 memset(stream
, 0, sizeof(*stream
));
884 stream
->next_in
= map
;
885 stream
->avail_in
= mapsize
;
886 stream
->next_out
= buffer
;
887 stream
->avail_out
= bufsiz
;
889 if (legacy_loose_object(map
)) {
891 return inflate(stream
, 0);
894 used
= unpack_object_header_gently(map
, mapsize
, &type
, &size
);
895 if (!used
|| !valid_loose_object_type
[type
])
900 /* Set up the stream for the rest.. */
901 stream
->next_in
= map
;
902 stream
->avail_in
= mapsize
;
905 /* And generate the fake traditional header */
906 stream
->total_out
= 1 + snprintf(buffer
, bufsiz
, "%s %lu",
907 type_names
[type
], size
);
911 static void *unpack_sha1_rest(z_stream
*stream
, void *buffer
, unsigned long size
)
913 int bytes
= strlen(buffer
) + 1;
914 unsigned char *buf
= xmalloc(1+size
);
917 n
= stream
->total_out
- bytes
;
920 memcpy(buf
, (char *) buffer
+ bytes
, n
);
923 stream
->next_out
= buf
+ bytes
;
924 stream
->avail_out
= size
- bytes
;
925 while (inflate(stream
, Z_FINISH
) == Z_OK
)
934 * We used to just use "sscanf()", but that's actually way
935 * too permissive for what we want to check. So do an anal
936 * object header parse by hand.
938 static int parse_sha1_header(char *hdr
, char *type
, unsigned long *sizep
)
944 * The type can be at most ten bytes (including the
945 * terminating '\0' that we add), and is followed by
960 * The length must follow immediately, and be in canonical
961 * decimal format (ie "010" is not valid).
968 unsigned long c
= *hdr
- '0';
972 size
= size
* 10 + c
;
978 * The length must be followed by a zero byte
980 return *hdr
? -1 : 0;
983 void * unpack_sha1_file(void *map
, unsigned long mapsize
, char *type
, unsigned long *size
)
989 ret
= unpack_sha1_header(&stream
, map
, mapsize
, hdr
, sizeof(hdr
));
990 if (ret
< Z_OK
|| parse_sha1_header(hdr
, type
, size
) < 0)
993 return unpack_sha1_rest(&stream
, hdr
, *size
);
996 static unsigned long get_delta_base(struct packed_git
*p
,
997 struct pack_window
**w_curs
,
998 unsigned long offset
,
999 enum object_type kind
,
1000 unsigned long delta_obj_offset
,
1001 unsigned long *base_obj_offset
)
1003 unsigned char *base_info
= use_pack(p
, w_curs
, offset
, NULL
);
1004 unsigned long base_offset
;
1006 /* use_pack() assured us we have [base_info, base_info + 20)
1007 * as a range that we can look at without walking off the
1008 * end of the mapped window. Its actually the hash size
1009 * that is assured. An OFS_DELTA longer than the hash size
1010 * is stupid, as then a REF_DELTA would be smaller to store.
1012 if (kind
== OBJ_OFS_DELTA
) {
1014 unsigned char c
= base_info
[used
++];
1015 base_offset
= c
& 127;
1018 if (!base_offset
|| base_offset
& ~(~0UL >> 7))
1019 die("offset value overflow for delta base object");
1020 c
= base_info
[used
++];
1021 base_offset
= (base_offset
<< 7) + (c
& 127);
1023 base_offset
= delta_obj_offset
- base_offset
;
1024 if (base_offset
>= delta_obj_offset
)
1025 die("delta base offset out of bound");
1027 } else if (kind
== OBJ_REF_DELTA
) {
1028 /* The base entry _must_ be in the same pack */
1029 base_offset
= find_pack_entry_one(base_info
, p
);
1031 die("failed to find delta-pack base object %s",
1032 sha1_to_hex(base_info
));
1035 die("I am totally screwed");
1036 *base_obj_offset
= base_offset
;
1040 /* forward declaration for a mutually recursive function */
1041 static int packed_object_info(struct packed_git
*p
, unsigned long offset
,
1042 char *type
, unsigned long *sizep
);
1044 static int packed_delta_info(struct packed_git
*p
,
1045 struct pack_window
**w_curs
,
1046 unsigned long offset
,
1047 enum object_type kind
,
1048 unsigned long obj_offset
,
1050 unsigned long *sizep
)
1052 unsigned long base_offset
;
1054 offset
= get_delta_base(p
, w_curs
, offset
, kind
,
1055 obj_offset
, &base_offset
);
1057 /* We choose to only get the type of the base object and
1058 * ignore potentially corrupt pack file that expects the delta
1059 * based on a base with a wrong size. This saves tons of
1062 if (packed_object_info(p
, base_offset
, type
, NULL
))
1063 die("cannot get info for delta-pack base");
1066 const unsigned char *data
;
1067 unsigned char delta_head
[20], *in
;
1068 unsigned long result_size
;
1072 memset(&stream
, 0, sizeof(stream
));
1073 stream
.next_out
= delta_head
;
1074 stream
.avail_out
= sizeof(delta_head
);
1076 inflateInit(&stream
);
1078 in
= use_pack(p
, w_curs
, offset
, &stream
.avail_in
);
1079 stream
.next_in
= in
;
1080 st
= inflate(&stream
, Z_FINISH
);
1081 offset
+= stream
.next_in
- in
;
1082 } while ((st
== Z_OK
|| st
== Z_BUF_ERROR
)
1083 && stream
.total_out
< sizeof(delta_head
));
1084 inflateEnd(&stream
);
1085 if ((st
!= Z_STREAM_END
) &&
1086 stream
.total_out
!= sizeof(delta_head
))
1087 die("delta data unpack-initial failed");
1089 /* Examine the initial part of the delta to figure out
1094 /* ignore base size */
1095 get_delta_hdr_size(&data
, delta_head
+sizeof(delta_head
));
1097 /* Read the result size */
1098 result_size
= get_delta_hdr_size(&data
, delta_head
+sizeof(delta_head
));
1099 *sizep
= result_size
;
1104 static unsigned long unpack_object_header(struct packed_git
*p
,
1105 struct pack_window
**w_curs
,
1106 unsigned long offset
,
1107 enum object_type
*type
,
1108 unsigned long *sizep
)
1110 unsigned char *base
;
1114 /* use_pack() assures us we have [base, base + 20) available
1115 * as a range that we can look at at. (Its actually the hash
1116 * size that is assurred.) With our object header encoding
1117 * the maximum deflated object size is 2^137, which is just
1118 * insane, so we know won't exceed what we have been given.
1120 base
= use_pack(p
, w_curs
, offset
, &left
);
1121 used
= unpack_object_header_gently(base
, left
, type
, sizep
);
1123 die("object offset outside of pack file");
1125 return offset
+ used
;
1128 void packed_object_info_detail(struct packed_git
*p
,
1129 unsigned long offset
,
1131 unsigned long *size
,
1132 unsigned long *store_size
,
1133 unsigned int *delta_chain_length
,
1134 unsigned char *base_sha1
)
1136 struct pack_window
*w_curs
= NULL
;
1137 unsigned long obj_offset
, val
;
1138 unsigned char *next_sha1
;
1139 enum object_type kind
;
1141 *delta_chain_length
= 0;
1142 obj_offset
= offset
;
1143 offset
= unpack_object_header(p
, &w_curs
, offset
, &kind
, size
);
1148 die("pack %s contains unknown object type %d",
1149 p
->pack_name
, kind
);
1154 strcpy(type
, type_names
[kind
]);
1155 *store_size
= 0; /* notyet */
1156 unuse_pack(&w_curs
);
1159 get_delta_base(p
, &w_curs
, offset
, kind
,
1160 obj_offset
, &offset
);
1161 if (*delta_chain_length
== 0) {
1162 /* TODO: find base_sha1 as pointed by offset */
1166 next_sha1
= use_pack(p
, &w_curs
, offset
, NULL
);
1167 if (*delta_chain_length
== 0)
1168 hashcpy(base_sha1
, next_sha1
);
1169 offset
= find_pack_entry_one(next_sha1
, p
);
1172 obj_offset
= offset
;
1173 offset
= unpack_object_header(p
, &w_curs
, offset
, &kind
, &val
);
1174 (*delta_chain_length
)++;
1178 static int packed_object_info(struct packed_git
*p
, unsigned long offset
,
1179 char *type
, unsigned long *sizep
)
1181 struct pack_window
*w_curs
= NULL
;
1182 unsigned long size
, obj_offset
= offset
;
1183 enum object_type kind
;
1186 offset
= unpack_object_header(p
, &w_curs
, offset
, &kind
, &size
);
1191 r
= packed_delta_info(p
, &w_curs
, offset
, kind
,
1192 obj_offset
, type
, sizep
);
1193 unuse_pack(&w_curs
);
1199 strcpy(type
, type_names
[kind
]);
1200 unuse_pack(&w_curs
);
1203 die("pack %s contains unknown object type %d",
1204 p
->pack_name
, kind
);
1211 static void *unpack_compressed_entry(struct packed_git
*p
,
1212 struct pack_window
**w_curs
,
1213 unsigned long offset
,
1218 unsigned char *buffer
, *in
;
1220 buffer
= xmalloc(size
+ 1);
1222 memset(&stream
, 0, sizeof(stream
));
1223 stream
.next_out
= buffer
;
1224 stream
.avail_out
= size
;
1226 inflateInit(&stream
);
1228 in
= use_pack(p
, w_curs
, offset
, &stream
.avail_in
);
1229 stream
.next_in
= in
;
1230 st
= inflate(&stream
, Z_FINISH
);
1231 offset
+= stream
.next_in
- in
;
1232 } while (st
== Z_OK
|| st
== Z_BUF_ERROR
);
1233 inflateEnd(&stream
);
1234 if ((st
!= Z_STREAM_END
) || stream
.total_out
!= size
) {
1242 static void *unpack_delta_entry(struct packed_git
*p
,
1243 struct pack_window
**w_curs
,
1244 unsigned long offset
,
1245 unsigned long delta_size
,
1246 enum object_type kind
,
1247 unsigned long obj_offset
,
1249 unsigned long *sizep
)
1251 void *delta_data
, *result
, *base
;
1252 unsigned long result_size
, base_size
, base_offset
;
1254 offset
= get_delta_base(p
, w_curs
, offset
, kind
,
1255 obj_offset
, &base_offset
);
1256 base
= unpack_entry(p
, base_offset
, type
, &base_size
);
1258 die("failed to read delta base object at %lu from %s",
1259 base_offset
, p
->pack_name
);
1261 delta_data
= unpack_compressed_entry(p
, w_curs
, offset
, delta_size
);
1262 result
= patch_delta(base
, base_size
,
1263 delta_data
, delta_size
,
1266 die("failed to apply delta");
1269 *sizep
= result_size
;
1273 void *unpack_entry(struct packed_git
*p
, unsigned long offset
,
1274 char *type
, unsigned long *sizep
)
1276 struct pack_window
*w_curs
= NULL
;
1277 unsigned long size
, obj_offset
= offset
;
1278 enum object_type kind
;
1281 offset
= unpack_object_header(p
, &w_curs
, offset
, &kind
, &size
);
1285 retval
= unpack_delta_entry(p
, &w_curs
, offset
, size
,
1286 kind
, obj_offset
, type
, sizep
);
1292 strcpy(type
, type_names
[kind
]);
1294 retval
= unpack_compressed_entry(p
, &w_curs
, offset
, size
);
1297 die("unknown object type %i in %s", kind
, p
->pack_name
);
1299 unuse_pack(&w_curs
);
1303 int num_packed_objects(const struct packed_git
*p
)
1305 /* See check_packed_git_idx() */
1306 return (p
->index_size
- 20 - 20 - 4*256) / 24;
1309 int nth_packed_object_sha1(const struct packed_git
*p
, int n
,
1310 unsigned char* sha1
)
1312 void *index
= p
->index_base
+ 256;
1313 if (n
< 0 || num_packed_objects(p
) <= n
)
1315 hashcpy(sha1
, (unsigned char *) index
+ (24 * n
) + 4);
1319 unsigned long find_pack_entry_one(const unsigned char *sha1
,
1320 struct packed_git
*p
)
1322 unsigned int *level1_ofs
= p
->index_base
;
1323 int hi
= ntohl(level1_ofs
[*sha1
]);
1324 int lo
= ((*sha1
== 0x0) ? 0 : ntohl(level1_ofs
[*sha1
- 1]));
1325 void *index
= p
->index_base
+ 256;
1328 int mi
= (lo
+ hi
) / 2;
1329 int cmp
= hashcmp((unsigned char *)index
+ (24 * mi
) + 4, sha1
);
1331 return ntohl(*((unsigned int *) ((char *) index
+ (24 * mi
))));
1340 static int matches_pack_name(struct packed_git
*p
, const char *ig
)
1342 const char *last_c
, *c
;
1344 if (!strcmp(p
->pack_name
, ig
))
1347 for (c
= p
->pack_name
, last_c
= c
; *c
;)
1352 if (!strcmp(last_c
, ig
))
1358 static int find_pack_entry(const unsigned char *sha1
, struct pack_entry
*e
, const char **ignore_packed
)
1360 struct packed_git
*p
;
1361 unsigned long offset
;
1363 prepare_packed_git();
1365 for (p
= packed_git
; p
; p
= p
->next
) {
1366 if (ignore_packed
) {
1368 for (ig
= ignore_packed
; *ig
; ig
++)
1369 if (!matches_pack_name(p
, *ig
))
1374 offset
= find_pack_entry_one(sha1
, p
);
1378 hashcpy(e
->sha1
, sha1
);
1385 struct packed_git
*find_sha1_pack(const unsigned char *sha1
,
1386 struct packed_git
*packs
)
1388 struct packed_git
*p
;
1390 for (p
= packs
; p
; p
= p
->next
) {
1391 if (find_pack_entry_one(sha1
, p
))
1398 static int sha1_loose_object_info(const unsigned char *sha1
, char *type
, unsigned long *sizep
)
1401 unsigned long mapsize
, size
;
1406 map
= map_sha1_file(sha1
, &mapsize
);
1408 return error("unable to find %s", sha1_to_hex(sha1
));
1409 if (unpack_sha1_header(&stream
, map
, mapsize
, hdr
, sizeof(hdr
)) < 0)
1410 status
= error("unable to unpack %s header",
1412 if (parse_sha1_header(hdr
, type
, &size
) < 0)
1413 status
= error("unable to parse %s header", sha1_to_hex(sha1
));
1419 inflateEnd(&stream
);
1420 munmap(map
, mapsize
);
1424 int sha1_object_info(const unsigned char *sha1
, char *type
, unsigned long *sizep
)
1426 struct pack_entry e
;
1428 if (!find_pack_entry(sha1
, &e
, NULL
)) {
1429 reprepare_packed_git();
1430 if (!find_pack_entry(sha1
, &e
, NULL
))
1431 return sha1_loose_object_info(sha1
, type
, sizep
);
1433 return packed_object_info(e
.p
, e
.offset
, type
, sizep
);
1436 static void *read_packed_sha1(const unsigned char *sha1
, char *type
, unsigned long *size
)
1438 struct pack_entry e
;
1440 if (!find_pack_entry(sha1
, &e
, NULL
)) {
1441 error("cannot read sha1_file for %s", sha1_to_hex(sha1
));
1444 return unpack_entry(e
.p
, e
.offset
, type
, size
);
1447 void * read_sha1_file(const unsigned char *sha1
, char *type
, unsigned long *size
)
1449 unsigned long mapsize
;
1451 struct pack_entry e
;
1453 if (find_pack_entry(sha1
, &e
, NULL
))
1454 return read_packed_sha1(sha1
, type
, size
);
1455 map
= map_sha1_file(sha1
, &mapsize
);
1457 buf
= unpack_sha1_file(map
, mapsize
, type
, size
);
1458 munmap(map
, mapsize
);
1461 reprepare_packed_git();
1462 if (find_pack_entry(sha1
, &e
, NULL
))
1463 return read_packed_sha1(sha1
, type
, size
);
1467 void *read_object_with_reference(const unsigned char *sha1
,
1468 const char *required_type
,
1469 unsigned long *size
,
1470 unsigned char *actual_sha1_return
)
1474 unsigned long isize
;
1475 unsigned char actual_sha1
[20];
1477 hashcpy(actual_sha1
, sha1
);
1479 int ref_length
= -1;
1480 const char *ref_type
= NULL
;
1482 buffer
= read_sha1_file(actual_sha1
, type
, &isize
);
1485 if (!strcmp(type
, required_type
)) {
1487 if (actual_sha1_return
)
1488 hashcpy(actual_sha1_return
, actual_sha1
);
1491 /* Handle references */
1492 else if (!strcmp(type
, commit_type
))
1494 else if (!strcmp(type
, tag_type
))
1495 ref_type
= "object ";
1500 ref_length
= strlen(ref_type
);
1502 if (memcmp(buffer
, ref_type
, ref_length
) ||
1503 get_sha1_hex((char *) buffer
+ ref_length
, actual_sha1
)) {
1508 /* Now we have the ID of the referred-to object in
1509 * actual_sha1. Check again. */
1513 static void write_sha1_file_prepare(void *buf
, unsigned long len
,
1514 const char *type
, unsigned char *sha1
,
1515 unsigned char *hdr
, int *hdrlen
)
1519 /* Generate the header */
1520 *hdrlen
= sprintf((char *)hdr
, "%s %lu", type
, len
)+1;
1524 SHA1_Update(&c
, hdr
, *hdrlen
);
1525 SHA1_Update(&c
, buf
, len
);
1526 SHA1_Final(sha1
, &c
);
1530 * Link the tempfile to the final place, possibly creating the
1531 * last directory level as you do so.
1533 * Returns the errno on failure, 0 on success.
1535 static int link_temp_to_file(const char *tmpfile
, const char *filename
)
1540 if (!link(tmpfile
, filename
))
1544 * Try to mkdir the last path component if that failed.
1546 * Re-try the "link()" regardless of whether the mkdir
1547 * succeeds, since a race might mean that somebody
1551 dir
= strrchr(filename
, '/');
1554 if (!mkdir(filename
, 0777) && adjust_shared_perm(filename
)) {
1559 if (!link(tmpfile
, filename
))
1567 * Move the just written object into its final resting place
1569 int move_temp_to_file(const char *tmpfile
, const char *filename
)
1571 int ret
= link_temp_to_file(tmpfile
, filename
);
1574 * Coda hack - coda doesn't like cross-directory links,
1575 * so we fall back to a rename, which will mean that it
1576 * won't be able to check collisions, but that's not a
1579 * The same holds for FAT formatted media.
1581 * When this succeeds, we just return 0. We have nothing
1584 if (ret
&& ret
!= EEXIST
) {
1585 if (!rename(tmpfile
, filename
))
1591 if (ret
!= EEXIST
) {
1592 return error("unable to write sha1 filename %s: %s\n", filename
, strerror(ret
));
1594 /* FIXME!!! Collision check here ? */
1600 static int write_buffer(int fd
, const void *buf
, size_t len
)
1605 size
= write(fd
, buf
, len
);
1607 return error("file write: disk full");
1609 if (errno
== EINTR
|| errno
== EAGAIN
)
1611 return error("file write error (%s)", strerror(errno
));
1614 buf
= (char *) buf
+ size
;
1619 static int write_binary_header(unsigned char *hdr
, enum object_type type
, unsigned long len
)
1624 c
= (type
<< 4) | (len
& 15);
1637 static void setup_object_header(z_stream
*stream
, const char *type
, unsigned long len
)
1641 if (use_legacy_headers
) {
1642 while (deflate(stream
, 0) == Z_OK
)
1646 if (!strcmp(type
, blob_type
))
1647 obj_type
= OBJ_BLOB
;
1648 else if (!strcmp(type
, tree_type
))
1649 obj_type
= OBJ_TREE
;
1650 else if (!strcmp(type
, commit_type
))
1651 obj_type
= OBJ_COMMIT
;
1652 else if (!strcmp(type
, tag_type
))
1655 die("trying to generate bogus object of type '%s'", type
);
1656 hdr
= write_binary_header(stream
->next_out
, obj_type
, len
);
1657 stream
->total_out
= hdr
;
1658 stream
->next_out
+= hdr
;
1659 stream
->avail_out
-= hdr
;
1662 int hash_sha1_file(void *buf
, unsigned long len
, const char *type
,
1663 unsigned char *sha1
)
1665 unsigned char hdr
[50];
1667 write_sha1_file_prepare(buf
, len
, type
, sha1
, hdr
, &hdrlen
);
1671 int write_sha1_file(void *buf
, unsigned long len
, const char *type
, unsigned char *returnsha1
)
1674 unsigned char *compressed
;
1676 unsigned char sha1
[20];
1678 static char tmpfile
[PATH_MAX
];
1679 unsigned char hdr
[50];
1682 /* Normally if we have it in the pack then we do not bother writing
1683 * it out into .git/objects/??/?{38} file.
1685 write_sha1_file_prepare(buf
, len
, type
, sha1
, hdr
, &hdrlen
);
1686 filename
= sha1_file_name(sha1
);
1688 hashcpy(returnsha1
, sha1
);
1689 if (has_sha1_file(sha1
))
1691 fd
= open(filename
, O_RDONLY
);
1694 * FIXME!!! We might do collision checking here, but we'd
1695 * need to uncompress the old file and check it. Later.
1701 if (errno
!= ENOENT
) {
1702 return error("sha1 file %s: %s\n", filename
, strerror(errno
));
1705 snprintf(tmpfile
, sizeof(tmpfile
), "%s/obj_XXXXXX", get_object_directory());
1707 fd
= mkstemp(tmpfile
);
1710 return error("insufficient permission for adding an object to repository database %s\n", get_object_directory());
1712 return error("unable to create temporary sha1 filename %s: %s\n", tmpfile
, strerror(errno
));
1716 memset(&stream
, 0, sizeof(stream
));
1717 deflateInit(&stream
, zlib_compression_level
);
1718 size
= 8 + deflateBound(&stream
, len
+hdrlen
);
1719 compressed
= xmalloc(size
);
1722 stream
.next_out
= compressed
;
1723 stream
.avail_out
= size
;
1725 /* First header.. */
1726 stream
.next_in
= hdr
;
1727 stream
.avail_in
= hdrlen
;
1728 setup_object_header(&stream
, type
, len
);
1730 /* Then the data itself.. */
1731 stream
.next_in
= buf
;
1732 stream
.avail_in
= len
;
1733 while (deflate(&stream
, Z_FINISH
) == Z_OK
)
1735 deflateEnd(&stream
);
1736 size
= stream
.total_out
;
1738 if (write_buffer(fd
, compressed
, size
) < 0)
1739 die("unable to write sha1 file");
1744 return move_temp_to_file(tmpfile
, filename
);
1748 * We need to unpack and recompress the object for writing
1749 * it out to a different file.
1751 static void *repack_object(const unsigned char *sha1
, unsigned long *objsize
)
1755 unsigned char *unpacked
;
1762 /* need to unpack and recompress it by itself */
1763 unpacked
= read_packed_sha1(sha1
, type
, &len
);
1765 hdrlen
= sprintf(hdr
, "%s %lu", type
, len
) + 1;
1768 memset(&stream
, 0, sizeof(stream
));
1769 deflateInit(&stream
, zlib_compression_level
);
1770 size
= deflateBound(&stream
, len
+ hdrlen
);
1771 buf
= xmalloc(size
);
1774 stream
.next_out
= buf
;
1775 stream
.avail_out
= size
;
1777 /* First header.. */
1778 stream
.next_in
= (void *)hdr
;
1779 stream
.avail_in
= hdrlen
;
1780 while (deflate(&stream
, 0) == Z_OK
)
1783 /* Then the data itself.. */
1784 stream
.next_in
= unpacked
;
1785 stream
.avail_in
= len
;
1786 while (deflate(&stream
, Z_FINISH
) == Z_OK
)
1788 deflateEnd(&stream
);
1791 *objsize
= stream
.total_out
;
1795 int write_sha1_to_fd(int fd
, const unsigned char *sha1
)
1798 unsigned long objsize
;
1799 void *buf
= map_sha1_file(sha1
, &objsize
);
1802 retval
= write_buffer(fd
, buf
, objsize
);
1803 munmap(buf
, objsize
);
1807 buf
= repack_object(sha1
, &objsize
);
1808 retval
= write_buffer(fd
, buf
, objsize
);
1813 int write_sha1_from_fd(const unsigned char *sha1
, int fd
, char *buffer
,
1814 size_t bufsize
, size_t *bufposn
)
1816 char tmpfile
[PATH_MAX
];
1819 unsigned char real_sha1
[20];
1820 unsigned char discard
[4096];
1824 snprintf(tmpfile
, sizeof(tmpfile
), "%s/obj_XXXXXX", get_object_directory());
1826 local
= mkstemp(tmpfile
);
1829 return error("insufficient permission for adding an object to repository database %s\n", get_object_directory());
1831 return error("unable to create temporary sha1 filename %s: %s\n", tmpfile
, strerror(errno
));
1834 memset(&stream
, 0, sizeof(stream
));
1836 inflateInit(&stream
);
1843 stream
.avail_in
= *bufposn
;
1844 stream
.next_in
= (unsigned char *) buffer
;
1846 stream
.next_out
= discard
;
1847 stream
.avail_out
= sizeof(discard
);
1848 ret
= inflate(&stream
, Z_SYNC_FLUSH
);
1849 SHA1_Update(&c
, discard
, sizeof(discard
) -
1851 } while (stream
.avail_in
&& ret
== Z_OK
);
1852 if (write_buffer(local
, buffer
, *bufposn
- stream
.avail_in
) < 0)
1853 die("unable to write sha1 file");
1854 memmove(buffer
, buffer
+ *bufposn
- stream
.avail_in
,
1856 *bufposn
= stream
.avail_in
;
1860 size
= read(fd
, buffer
+ *bufposn
, bufsize
- *bufposn
);
1865 return error("Connection closed?");
1866 perror("Reading from connection");
1871 inflateEnd(&stream
);
1874 SHA1_Final(real_sha1
, &c
);
1875 if (ret
!= Z_STREAM_END
) {
1877 return error("File %s corrupted", sha1_to_hex(sha1
));
1879 if (hashcmp(sha1
, real_sha1
)) {
1881 return error("File %s has bad hash", sha1_to_hex(sha1
));
1884 return move_temp_to_file(tmpfile
, sha1_file_name(sha1
));
1887 int has_pack_index(const unsigned char *sha1
)
1890 if (stat(sha1_pack_index_name(sha1
), &st
))
1895 int has_pack_file(const unsigned char *sha1
)
1898 if (stat(sha1_pack_name(sha1
), &st
))
1903 int has_sha1_pack(const unsigned char *sha1
, const char **ignore_packed
)
1905 struct pack_entry e
;
1906 return find_pack_entry(sha1
, &e
, ignore_packed
);
1909 int has_sha1_file(const unsigned char *sha1
)
1912 struct pack_entry e
;
1914 if (find_pack_entry(sha1
, &e
, NULL
))
1916 return find_sha1_file(sha1
, &st
) ? 1 : 0;
1920 * reads from fd as long as possible into a supplied buffer of size bytes.
1921 * If necessary the buffer's size is increased using realloc()
1923 * returns 0 if anything went fine and -1 otherwise
1925 * NOTE: both buf and size may change, but even when -1 is returned
1926 * you still have to free() it yourself.
1928 int read_pipe(int fd
, char** return_buf
, unsigned long* return_size
)
1930 char* buf
= *return_buf
;
1931 unsigned long size
= *return_size
;
1933 unsigned long off
= 0;
1936 iret
= xread(fd
, buf
+ off
, size
- off
);
1941 buf
= xrealloc(buf
, size
);
1954 int index_pipe(unsigned char *sha1
, int fd
, const char *type
, int write_object
)
1956 unsigned long size
= 4096;
1957 char *buf
= xmalloc(size
);
1960 if (read_pipe(fd
, &buf
, &size
)) {
1968 ret
= write_sha1_file(buf
, size
, type
, sha1
);
1970 ret
= hash_sha1_file(buf
, size
, type
, sha1
);
1975 int index_fd(unsigned char *sha1
, int fd
, struct stat
*st
, int write_object
, const char *type
)
1977 unsigned long size
= st
->st_size
;
1983 buf
= mmap(NULL
, size
, PROT_READ
, MAP_PRIVATE
, fd
, 0);
1985 if (buf
== MAP_FAILED
)
1991 ret
= write_sha1_file(buf
, size
, type
, sha1
);
1993 ret
= hash_sha1_file(buf
, size
, type
, sha1
);
1999 int index_path(unsigned char *sha1
, const char *path
, struct stat
*st
, int write_object
)
2004 switch (st
->st_mode
& S_IFMT
) {
2006 fd
= open(path
, O_RDONLY
);
2008 return error("open(\"%s\"): %s", path
,
2010 if (index_fd(sha1
, fd
, st
, write_object
, NULL
) < 0)
2011 return error("%s: failed to insert into database",
2015 target
= xmalloc(st
->st_size
+1);
2016 if (readlink(path
, target
, st
->st_size
+1) != st
->st_size
) {
2017 char *errstr
= strerror(errno
);
2019 return error("readlink(\"%s\"): %s", path
,
2023 hash_sha1_file(target
, st
->st_size
, blob_type
, sha1
);
2024 else if (write_sha1_file(target
, st
->st_size
, blob_type
, sha1
))
2025 return error("%s: failed to insert into database",
2030 return error("%s: unsupported file type", path
);