2 * GIT - The information manager from hell
4 * Copyright (C) Linus Torvalds, 2005
6 * This handles basic git sha1 object files - packing, unpacking,
18 #if defined(__linux__) && (defined(__i386__) || defined(__PPC__))
19 #define O_NOATIME 01000000
31 const unsigned char null_sha1
[20];
33 static unsigned int sha1_file_open_flag
= O_NOATIME
;
35 signed char hexval_table
[256] = {
36 -1, -1, -1, -1, -1, -1, -1, -1, /* 00-07 */
37 -1, -1, -1, -1, -1, -1, -1, -1, /* 08-0f */
38 -1, -1, -1, -1, -1, -1, -1, -1, /* 10-17 */
39 -1, -1, -1, -1, -1, -1, -1, -1, /* 18-1f */
40 -1, -1, -1, -1, -1, -1, -1, -1, /* 20-27 */
41 -1, -1, -1, -1, -1, -1, -1, -1, /* 28-2f */
42 0, 1, 2, 3, 4, 5, 6, 7, /* 30-37 */
43 8, 9, -1, -1, -1, -1, -1, -1, /* 38-3f */
44 -1, 10, 11, 12, 13, 14, 15, -1, /* 40-47 */
45 -1, -1, -1, -1, -1, -1, -1, -1, /* 48-4f */
46 -1, -1, -1, -1, -1, -1, -1, -1, /* 50-57 */
47 -1, -1, -1, -1, -1, -1, -1, -1, /* 58-5f */
48 -1, 10, 11, 12, 13, 14, 15, -1, /* 60-67 */
49 -1, -1, -1, -1, -1, -1, -1, -1, /* 68-67 */
50 -1, -1, -1, -1, -1, -1, -1, -1, /* 70-77 */
51 -1, -1, -1, -1, -1, -1, -1, -1, /* 78-7f */
52 -1, -1, -1, -1, -1, -1, -1, -1, /* 80-87 */
53 -1, -1, -1, -1, -1, -1, -1, -1, /* 88-8f */
54 -1, -1, -1, -1, -1, -1, -1, -1, /* 90-97 */
55 -1, -1, -1, -1, -1, -1, -1, -1, /* 98-9f */
56 -1, -1, -1, -1, -1, -1, -1, -1, /* a0-a7 */
57 -1, -1, -1, -1, -1, -1, -1, -1, /* a8-af */
58 -1, -1, -1, -1, -1, -1, -1, -1, /* b0-b7 */
59 -1, -1, -1, -1, -1, -1, -1, -1, /* b8-bf */
60 -1, -1, -1, -1, -1, -1, -1, -1, /* c0-c7 */
61 -1, -1, -1, -1, -1, -1, -1, -1, /* c8-cf */
62 -1, -1, -1, -1, -1, -1, -1, -1, /* d0-d7 */
63 -1, -1, -1, -1, -1, -1, -1, -1, /* d8-df */
64 -1, -1, -1, -1, -1, -1, -1, -1, /* e0-e7 */
65 -1, -1, -1, -1, -1, -1, -1, -1, /* e8-ef */
66 -1, -1, -1, -1, -1, -1, -1, -1, /* f0-f7 */
67 -1, -1, -1, -1, -1, -1, -1, -1, /* f8-ff */
70 int get_sha1_hex(const char *hex
, unsigned char *sha1
)
73 for (i
= 0; i
< 20; i
++) {
74 unsigned int val
= (hexval(hex
[0]) << 4) | hexval(hex
[1]);
83 int safe_create_leading_directories(char *path
)
92 pos
= strchr(pos
, '/');
96 if (!stat(path
, &st
)) {
98 if (!S_ISDIR(st
.st_mode
)) {
103 else if (mkdir(path
, 0777)) {
107 else if (adjust_shared_perm(path
)) {
116 char * sha1_to_hex(const unsigned char *sha1
)
119 static char hexbuffer
[4][50];
120 static const char hex
[] = "0123456789abcdef";
121 char *buffer
= hexbuffer
[3 & ++bufno
], *buf
= buffer
;
124 for (i
= 0; i
< 20; i
++) {
125 unsigned int val
= *sha1
++;
126 *buf
++ = hex
[val
>> 4];
127 *buf
++ = hex
[val
& 0xf];
134 static void fill_sha1_path(char *pathbuf
, const unsigned char *sha1
)
137 for (i
= 0; i
< 20; i
++) {
138 static char hex
[] = "0123456789abcdef";
139 unsigned int val
= sha1
[i
];
140 char *pos
= pathbuf
+ i
*2 + (i
> 0);
141 *pos
++ = hex
[val
>> 4];
142 *pos
= hex
[val
& 0xf];
147 * NOTE! This returns a statically allocated buffer, so you have to be
148 * careful about using it. Do a "xstrdup()" if you need to save the
151 * Also note that this returns the location for creating. Reading
152 * SHA1 file can happen from any alternate directory listed in the
153 * DB_ENVIRONMENT environment variable if it is not found in
154 * the primary object database.
156 char *sha1_file_name(const unsigned char *sha1
)
158 static char *name
, *base
;
161 const char *sha1_file_directory
= get_object_directory();
162 int len
= strlen(sha1_file_directory
);
163 base
= xmalloc(len
+ 60);
164 memcpy(base
, sha1_file_directory
, len
);
165 memset(base
+len
, 0, 60);
168 name
= base
+ len
+ 1;
170 fill_sha1_path(name
, sha1
);
174 char *sha1_pack_name(const unsigned char *sha1
)
176 static const char hex
[] = "0123456789abcdef";
177 static char *name
, *base
, *buf
;
181 const char *sha1_file_directory
= get_object_directory();
182 int len
= strlen(sha1_file_directory
);
183 base
= xmalloc(len
+ 60);
184 sprintf(base
, "%s/pack/pack-1234567890123456789012345678901234567890.pack", sha1_file_directory
);
185 name
= base
+ len
+ 11;
190 for (i
= 0; i
< 20; i
++) {
191 unsigned int val
= *sha1
++;
192 *buf
++ = hex
[val
>> 4];
193 *buf
++ = hex
[val
& 0xf];
199 char *sha1_pack_index_name(const unsigned char *sha1
)
201 static const char hex
[] = "0123456789abcdef";
202 static char *name
, *base
, *buf
;
206 const char *sha1_file_directory
= get_object_directory();
207 int len
= strlen(sha1_file_directory
);
208 base
= xmalloc(len
+ 60);
209 sprintf(base
, "%s/pack/pack-1234567890123456789012345678901234567890.idx", sha1_file_directory
);
210 name
= base
+ len
+ 11;
215 for (i
= 0; i
< 20; i
++) {
216 unsigned int val
= *sha1
++;
217 *buf
++ = hex
[val
>> 4];
218 *buf
++ = hex
[val
& 0xf];
224 struct alternate_object_database
*alt_odb_list
;
225 static struct alternate_object_database
**alt_odb_tail
;
227 static void read_info_alternates(const char * alternates
, int depth
);
230 * Prepare alternate object database registry.
232 * The variable alt_odb_list points at the list of struct
233 * alternate_object_database. The elements on this list come from
234 * non-empty elements from colon separated ALTERNATE_DB_ENVIRONMENT
235 * environment variable, and $GIT_OBJECT_DIRECTORY/info/alternates,
236 * whose contents is similar to that environment variable but can be
237 * LF separated. Its base points at a statically allocated buffer that
238 * contains "/the/directory/corresponding/to/.git/objects/...", while
239 * its name points just after the slash at the end of ".git/objects/"
240 * in the example above, and has enough space to hold 40-byte hex
241 * SHA1, an extra slash for the first level indirection, and the
244 static int link_alt_odb_entry(const char * entry
, int len
, const char * relative_base
, int depth
)
247 const char *objdir
= get_object_directory();
248 struct alternate_object_database
*ent
;
249 struct alternate_object_database
*alt
;
250 /* 43 = 40-byte + 2 '/' + terminating NUL */
252 int entlen
= pfxlen
+ 43;
255 if (*entry
!= '/' && relative_base
) {
256 /* Relative alt-odb */
258 base_len
= strlen(relative_base
) + 1;
262 ent
= xmalloc(sizeof(*ent
) + entlen
);
264 if (*entry
!= '/' && relative_base
) {
265 memcpy(ent
->base
, relative_base
, base_len
- 1);
266 ent
->base
[base_len
- 1] = '/';
267 memcpy(ent
->base
+ base_len
, entry
, len
);
270 memcpy(ent
->base
, entry
, pfxlen
);
272 ent
->name
= ent
->base
+ pfxlen
+ 1;
273 ent
->base
[pfxlen
+ 3] = '/';
274 ent
->base
[pfxlen
] = ent
->base
[entlen
-1] = 0;
276 /* Detect cases where alternate disappeared */
277 if (stat(ent
->base
, &st
) || !S_ISDIR(st
.st_mode
)) {
278 error("object directory %s does not exist; "
279 "check .git/objects/info/alternates.",
285 /* Prevent the common mistake of listing the same
286 * thing twice, or object directory itself.
288 for (alt
= alt_odb_list
; alt
; alt
= alt
->next
) {
289 if (!memcmp(ent
->base
, alt
->base
, pfxlen
)) {
294 if (!memcmp(ent
->base
, objdir
, pfxlen
)) {
299 /* add the alternate entry */
301 alt_odb_tail
= &(ent
->next
);
304 /* recursively add alternates */
305 read_info_alternates(ent
->base
, depth
+ 1);
307 ent
->base
[pfxlen
] = '/';
312 static void link_alt_odb_entries(const char *alt
, const char *ep
, int sep
,
313 const char *relative_base
, int depth
)
315 const char *cp
, *last
;
318 error("%s: ignoring alternate object stores, nesting too deep.",
326 if (cp
< ep
&& *cp
== '#') {
327 while (cp
< ep
&& *cp
!= sep
)
332 while (cp
< ep
&& *cp
!= sep
)
335 if ((*last
!= '/') && depth
) {
336 error("%s: ignoring relative alternate object store %s",
337 relative_base
, last
);
339 link_alt_odb_entry(last
, cp
- last
,
340 relative_base
, depth
);
343 while (cp
< ep
&& *cp
== sep
)
349 static void read_info_alternates(const char * relative_base
, int depth
)
356 sprintf(path
, "%s/info/alternates", relative_base
);
357 fd
= open(path
, O_RDONLY
);
360 if (fstat(fd
, &st
) || (st
.st_size
== 0)) {
364 map
= xmmap(NULL
, st
.st_size
, PROT_READ
, MAP_PRIVATE
, fd
, 0);
367 link_alt_odb_entries(map
, map
+ st
.st_size
, '\n', relative_base
, depth
);
369 munmap(map
, st
.st_size
);
372 void prepare_alt_odb(void)
376 alt
= getenv(ALTERNATE_DB_ENVIRONMENT
);
381 alt_odb_tail
= &alt_odb_list
;
382 link_alt_odb_entries(alt
, alt
+ strlen(alt
), ':', NULL
, 0);
384 read_info_alternates(get_object_directory(), 0);
387 static char *find_sha1_file(const unsigned char *sha1
, struct stat
*st
)
389 char *name
= sha1_file_name(sha1
);
390 struct alternate_object_database
*alt
;
395 for (alt
= alt_odb_list
; alt
; alt
= alt
->next
) {
397 fill_sha1_path(name
, sha1
);
398 if (!stat(alt
->base
, st
))
404 static unsigned int pack_used_ctr
;
405 static unsigned int pack_mmap_calls
;
406 static unsigned int peak_pack_open_windows
;
407 static unsigned int pack_open_windows
;
408 static size_t peak_pack_mapped
;
409 static size_t pack_mapped
;
410 static size_t page_size
;
411 struct packed_git
*packed_git
;
416 "pack_report: getpagesize() = %10" SZ_FMT
"\n"
417 "pack_report: core.packedGitWindowSize = %10" SZ_FMT
"\n"
418 "pack_report: core.packedGitLimit = %10" SZ_FMT
"\n",
420 packed_git_window_size
,
423 "pack_report: pack_used_ctr = %10u\n"
424 "pack_report: pack_mmap_calls = %10u\n"
425 "pack_report: pack_open_windows = %10u / %10u\n"
426 "pack_report: pack_mapped = "
427 "%10" SZ_FMT
" / %10" SZ_FMT
"\n",
430 pack_open_windows
, peak_pack_open_windows
,
431 pack_mapped
, peak_pack_mapped
);
434 static int check_packed_git_idx(const char *path
, unsigned long *idx_size_
,
439 unsigned long idx_size
;
441 int fd
= open(path
, O_RDONLY
);
445 if (fstat(fd
, &st
)) {
449 idx_size
= st
.st_size
;
450 idx_map
= xmmap(NULL
, idx_size
, PROT_READ
, MAP_PRIVATE
, fd
, 0);
455 *idx_size_
= idx_size
;
457 /* check index map */
458 if (idx_size
< 4*256 + 20 + 20)
459 return error("index file %s is too small", path
);
461 /* a future index format would start with this, as older git
462 * binaries would fail the non-monotonic index check below.
463 * give a nicer warning to the user if we can.
465 if (index
[0] == htonl(PACK_IDX_SIGNATURE
))
466 return error("index file %s is a newer version"
467 " and is not supported by this binary"
468 " (try upgrading GIT to a newer version)",
472 for (i
= 0; i
< 256; i
++) {
473 unsigned int n
= ntohl(index
[i
]);
475 return error("non-monotonic index %s", path
);
481 * - 256 index entries 4 bytes each
482 * - 24-byte entries * nr (20-byte sha1 + 4-byte offset)
483 * - 20-byte SHA1 of the packfile
484 * - 20-byte SHA1 file checksum
486 if (idx_size
!= 4*256 + nr
* 24 + 20 + 20)
487 return error("wrong index file size in %s", path
);
492 static void scan_windows(struct packed_git
*p
,
493 struct packed_git
**lru_p
,
494 struct pack_window
**lru_w
,
495 struct pack_window
**lru_l
)
497 struct pack_window
*w
, *w_l
;
499 for (w_l
= NULL
, w
= p
->windows
; w
; w
= w
->next
) {
501 if (!*lru_w
|| w
->last_used
< (*lru_w
)->last_used
) {
511 static int unuse_one_window(struct packed_git
*current
)
513 struct packed_git
*p
, *lru_p
= NULL
;
514 struct pack_window
*lru_w
= NULL
, *lru_l
= NULL
;
517 scan_windows(current
, &lru_p
, &lru_w
, &lru_l
);
518 for (p
= packed_git
; p
; p
= p
->next
)
519 scan_windows(p
, &lru_p
, &lru_w
, &lru_l
);
521 munmap(lru_w
->base
, lru_w
->len
);
522 pack_mapped
-= lru_w
->len
;
524 lru_l
->next
= lru_w
->next
;
526 lru_p
->windows
= lru_w
->next
;
527 if (!lru_p
->windows
&& lru_p
!= current
) {
528 close(lru_p
->pack_fd
);
539 void release_pack_memory(size_t need
)
541 size_t cur
= pack_mapped
;
542 while (need
>= (cur
- pack_mapped
) && unuse_one_window(NULL
))
546 void unuse_pack(struct pack_window
**w_cursor
)
548 struct pack_window
*w
= *w_cursor
;
555 static int open_packed_git(struct packed_git
*p
)
558 struct pack_header hdr
;
559 unsigned char sha1
[20];
560 unsigned char *idx_sha1
;
563 p
->pack_fd
= open(p
->pack_name
, O_RDONLY
);
564 if (p
->pack_fd
< 0 || fstat(p
->pack_fd
, &st
))
567 /* If we created the struct before we had the pack we lack size. */
569 if (!S_ISREG(st
.st_mode
))
570 return error("packfile %s not a regular file", p
->pack_name
);
571 p
->pack_size
= st
.st_size
;
572 } else if (p
->pack_size
!= st
.st_size
)
573 return error("packfile %s size changed", p
->pack_name
);
575 /* We leave these file descriptors open with sliding mmap;
576 * there is no point keeping them open across exec(), though.
578 fd_flag
= fcntl(p
->pack_fd
, F_GETFD
, 0);
580 return error("cannot determine file descriptor flags");
581 fd_flag
|= FD_CLOEXEC
;
582 if (fcntl(p
->pack_fd
, F_SETFD
, fd_flag
) == -1)
583 return error("cannot set FD_CLOEXEC");
585 /* Verify we recognize this pack file format. */
586 if (read_in_full(p
->pack_fd
, &hdr
, sizeof(hdr
)) != sizeof(hdr
))
587 return error("file %s is far too short to be a packfile", p
->pack_name
);
588 if (hdr
.hdr_signature
!= htonl(PACK_SIGNATURE
))
589 return error("file %s is not a GIT packfile", p
->pack_name
);
590 if (!pack_version_ok(hdr
.hdr_version
))
591 return error("packfile %s is version %u and not supported"
592 " (try upgrading GIT to a newer version)",
593 p
->pack_name
, ntohl(hdr
.hdr_version
));
595 /* Verify the pack matches its index. */
596 if (num_packed_objects(p
) != ntohl(hdr
.hdr_entries
))
597 return error("packfile %s claims to have %u objects"
598 " while index size indicates %u objects",
599 p
->pack_name
, ntohl(hdr
.hdr_entries
),
600 num_packed_objects(p
));
601 if (lseek(p
->pack_fd
, p
->pack_size
- sizeof(sha1
), SEEK_SET
) == -1)
602 return error("end of packfile %s is unavailable", p
->pack_name
);
603 if (read_in_full(p
->pack_fd
, sha1
, sizeof(sha1
)) != sizeof(sha1
))
604 return error("packfile %s signature is unavailable", p
->pack_name
);
605 idx_sha1
= ((unsigned char *)p
->index_base
) + p
->index_size
- 40;
606 if (hashcmp(sha1
, idx_sha1
))
607 return error("packfile %s does not match index", p
->pack_name
);
611 static int in_window(struct pack_window
*win
, unsigned long offset
)
613 /* We must promise at least 20 bytes (one hash) after the
614 * offset is available from this window, otherwise the offset
615 * is not actually in this window and a different window (which
616 * has that one hash excess) must be used. This is to support
617 * the object header and delta base parsing routines below.
619 off_t win_off
= win
->offset
;
620 return win_off
<= offset
621 && (offset
+ 20) <= (win_off
+ win
->len
);
624 unsigned char* use_pack(struct packed_git
*p
,
625 struct pack_window
**w_cursor
,
626 unsigned long offset
,
629 struct pack_window
*win
= *w_cursor
;
631 if (p
->pack_fd
== -1 && open_packed_git(p
))
632 die("packfile %s cannot be accessed", p
->pack_name
);
634 /* Since packfiles end in a hash of their content and its
635 * pointless to ask for an offset into the middle of that
636 * hash, and the in_window function above wouldn't match
637 * don't allow an offset too close to the end of the file.
639 if (offset
> (p
->pack_size
- 20))
640 die("offset beyond end of packfile (truncated pack?)");
642 if (!win
|| !in_window(win
, offset
)) {
645 for (win
= p
->windows
; win
; win
= win
->next
) {
646 if (in_window(win
, offset
))
651 page_size
= getpagesize();
652 win
= xcalloc(1, sizeof(*win
));
653 win
->offset
= (offset
/ page_size
) * page_size
;
654 win
->len
= p
->pack_size
- win
->offset
;
655 if (win
->len
> packed_git_window_size
)
656 win
->len
= packed_git_window_size
;
657 pack_mapped
+= win
->len
;
658 while (packed_git_limit
< pack_mapped
659 && unuse_one_window(p
))
661 win
->base
= xmmap(NULL
, win
->len
,
662 PROT_READ
, MAP_PRIVATE
,
663 p
->pack_fd
, win
->offset
);
664 if (win
->base
== MAP_FAILED
)
665 die("packfile %s cannot be mapped: %s",
670 if (pack_mapped
> peak_pack_mapped
)
671 peak_pack_mapped
= pack_mapped
;
672 if (pack_open_windows
> peak_pack_open_windows
)
673 peak_pack_open_windows
= pack_open_windows
;
674 win
->next
= p
->windows
;
678 if (win
!= *w_cursor
) {
679 win
->last_used
= pack_used_ctr
++;
683 offset
-= win
->offset
;
685 *left
= win
->len
- offset
;
686 return win
->base
+ offset
;
689 struct packed_git
*add_packed_git(char *path
, int path_len
, int local
)
692 struct packed_git
*p
;
693 unsigned long idx_size
;
695 unsigned char sha1
[20];
697 if (check_packed_git_idx(path
, &idx_size
, &idx_map
))
700 /* do we have a corresponding .pack file? */
701 strcpy(path
+ path_len
- 4, ".pack");
702 if (stat(path
, &st
) || !S_ISREG(st
.st_mode
)) {
703 munmap(idx_map
, idx_size
);
706 /* ok, it looks sane as far as we can check without
707 * actually mapping the pack file.
709 p
= xmalloc(sizeof(*p
) + path_len
+ 2);
710 strcpy(p
->pack_name
, path
);
711 p
->index_size
= idx_size
;
712 p
->pack_size
= st
.st_size
;
713 p
->index_base
= idx_map
;
717 p
->pack_local
= local
;
718 if ((path_len
> 44) && !get_sha1_hex(path
+ path_len
- 44, sha1
))
719 hashcpy(p
->sha1
, sha1
);
723 struct packed_git
*parse_pack_index(unsigned char *sha1
)
725 char *path
= sha1_pack_index_name(sha1
);
726 return parse_pack_index_file(sha1
, path
);
729 struct packed_git
*parse_pack_index_file(const unsigned char *sha1
, char *idx_path
)
731 struct packed_git
*p
;
732 unsigned long idx_size
;
736 if (check_packed_git_idx(idx_path
, &idx_size
, &idx_map
))
739 path
= sha1_pack_name(sha1
);
741 p
= xmalloc(sizeof(*p
) + strlen(path
) + 2);
742 strcpy(p
->pack_name
, path
);
743 p
->index_size
= idx_size
;
745 p
->index_base
= idx_map
;
749 hashcpy(p
->sha1
, sha1
);
753 void install_packed_git(struct packed_git
*pack
)
755 pack
->next
= packed_git
;
759 static void prepare_packed_git_one(char *objdir
, int local
)
766 sprintf(path
, "%s/pack", objdir
);
771 error("unable to open object pack directory: %s: %s",
772 path
, strerror(errno
));
776 while ((de
= readdir(dir
)) != NULL
) {
777 int namelen
= strlen(de
->d_name
);
778 struct packed_git
*p
;
780 if (!has_extension(de
->d_name
, ".idx"))
783 /* Don't reopen a pack we already have. */
784 strcpy(path
+ len
, de
->d_name
);
785 for (p
= packed_git
; p
; p
= p
->next
) {
786 if (!memcmp(path
, p
->pack_name
, len
+ namelen
- 4))
791 /* See if it really is a valid .idx file with corresponding
792 * .pack file that we can map.
794 p
= add_packed_git(path
, len
+ namelen
, local
);
797 install_packed_git(p
);
802 static int prepare_packed_git_run_once
= 0;
803 void prepare_packed_git(void)
805 struct alternate_object_database
*alt
;
807 if (prepare_packed_git_run_once
)
809 prepare_packed_git_one(get_object_directory(), 1);
811 for (alt
= alt_odb_list
; alt
; alt
= alt
->next
) {
813 prepare_packed_git_one(alt
->base
, 0);
816 prepare_packed_git_run_once
= 1;
819 void reprepare_packed_git(void)
821 prepare_packed_git_run_once
= 0;
822 prepare_packed_git();
825 int check_sha1_signature(const unsigned char *sha1
, void *map
, unsigned long size
, const char *type
)
827 unsigned char real_sha1
[20];
828 hash_sha1_file(map
, size
, type
, real_sha1
);
829 return hashcmp(sha1
, real_sha1
) ? -1 : 0;
832 void *map_sha1_file(const unsigned char *sha1
, unsigned long *size
)
837 char *filename
= find_sha1_file(sha1
, &st
);
843 fd
= open(filename
, O_RDONLY
| sha1_file_open_flag
);
845 /* See if it works without O_NOATIME */
846 switch (sha1_file_open_flag
) {
848 fd
= open(filename
, O_RDONLY
);
856 /* If it failed once, it will probably fail again.
857 * Stop using O_NOATIME
859 sha1_file_open_flag
= 0;
861 map
= xmmap(NULL
, st
.st_size
, PROT_READ
, MAP_PRIVATE
, fd
, 0);
867 int legacy_loose_object(unsigned char *map
)
872 * Is it a zlib-compressed buffer? If so, the first byte
873 * must be 0x78 (15-bit window size, deflated), and the
874 * first 16-bit word is evenly divisible by 31
876 word
= (map
[0] << 8) + map
[1];
877 if (map
[0] == 0x78 && !(word
% 31))
883 unsigned long unpack_object_header_gently(const unsigned char *buf
, unsigned long len
, enum object_type
*type
, unsigned long *sizep
)
888 unsigned long used
= 0;
891 *type
= (c
>> 4) & 7;
897 if (sizeof(long) * 8 <= shift
)
900 size
+= (c
& 0x7f) << shift
;
907 static int unpack_sha1_header(z_stream
*stream
, unsigned char *map
, unsigned long mapsize
, void *buffer
, unsigned long bufsiz
)
909 unsigned long size
, used
;
910 static const char valid_loose_object_type
[8] = {
912 1, 1, 1, 1, /* "commit", "tree", "blob", "tag" */
913 0, /* "delta" and others are invalid in a loose object */
915 enum object_type type
;
917 /* Get the data stream */
918 memset(stream
, 0, sizeof(*stream
));
919 stream
->next_in
= map
;
920 stream
->avail_in
= mapsize
;
921 stream
->next_out
= buffer
;
922 stream
->avail_out
= bufsiz
;
924 if (legacy_loose_object(map
)) {
926 return inflate(stream
, 0);
929 used
= unpack_object_header_gently(map
, mapsize
, &type
, &size
);
930 if (!used
|| !valid_loose_object_type
[type
])
935 /* Set up the stream for the rest.. */
936 stream
->next_in
= map
;
937 stream
->avail_in
= mapsize
;
940 /* And generate the fake traditional header */
941 stream
->total_out
= 1 + snprintf(buffer
, bufsiz
, "%s %lu",
942 type_names
[type
], size
);
946 static void *unpack_sha1_rest(z_stream
*stream
, void *buffer
, unsigned long size
)
948 int bytes
= strlen(buffer
) + 1;
949 unsigned char *buf
= xmalloc(1+size
);
952 n
= stream
->total_out
- bytes
;
955 memcpy(buf
, (char *) buffer
+ bytes
, n
);
958 stream
->next_out
= buf
+ bytes
;
959 stream
->avail_out
= size
- bytes
;
960 while (inflate(stream
, Z_FINISH
) == Z_OK
)
969 * We used to just use "sscanf()", but that's actually way
970 * too permissive for what we want to check. So do an anal
971 * object header parse by hand.
973 static int parse_sha1_header(char *hdr
, char *type
, unsigned long *sizep
)
979 * The type can be at most ten bytes (including the
980 * terminating '\0' that we add), and is followed by
995 * The length must follow immediately, and be in canonical
996 * decimal format (ie "010" is not valid).
1003 unsigned long c
= *hdr
- '0';
1007 size
= size
* 10 + c
;
1013 * The length must be followed by a zero byte
1015 return *hdr
? -1 : 0;
1018 void * unpack_sha1_file(void *map
, unsigned long mapsize
, char *type
, unsigned long *size
)
1024 ret
= unpack_sha1_header(&stream
, map
, mapsize
, hdr
, sizeof(hdr
));
1025 if (ret
< Z_OK
|| parse_sha1_header(hdr
, type
, size
) < 0)
1028 return unpack_sha1_rest(&stream
, hdr
, *size
);
1031 static unsigned long get_delta_base(struct packed_git
*p
,
1032 struct pack_window
**w_curs
,
1033 unsigned long offset
,
1034 enum object_type kind
,
1035 unsigned long delta_obj_offset
,
1036 unsigned long *base_obj_offset
)
1038 unsigned char *base_info
= use_pack(p
, w_curs
, offset
, NULL
);
1039 unsigned long base_offset
;
1041 /* use_pack() assured us we have [base_info, base_info + 20)
1042 * as a range that we can look at without walking off the
1043 * end of the mapped window. Its actually the hash size
1044 * that is assured. An OFS_DELTA longer than the hash size
1045 * is stupid, as then a REF_DELTA would be smaller to store.
1047 if (kind
== OBJ_OFS_DELTA
) {
1049 unsigned char c
= base_info
[used
++];
1050 base_offset
= c
& 127;
1053 if (!base_offset
|| base_offset
& ~(~0UL >> 7))
1054 die("offset value overflow for delta base object");
1055 c
= base_info
[used
++];
1056 base_offset
= (base_offset
<< 7) + (c
& 127);
1058 base_offset
= delta_obj_offset
- base_offset
;
1059 if (base_offset
>= delta_obj_offset
)
1060 die("delta base offset out of bound");
1062 } else if (kind
== OBJ_REF_DELTA
) {
1063 /* The base entry _must_ be in the same pack */
1064 base_offset
= find_pack_entry_one(base_info
, p
);
1066 die("failed to find delta-pack base object %s",
1067 sha1_to_hex(base_info
));
1070 die("I am totally screwed");
1071 *base_obj_offset
= base_offset
;
1075 /* forward declaration for a mutually recursive function */
1076 static int packed_object_info(struct packed_git
*p
, unsigned long offset
,
1077 char *type
, unsigned long *sizep
);
1079 static int packed_delta_info(struct packed_git
*p
,
1080 struct pack_window
**w_curs
,
1081 unsigned long offset
,
1082 enum object_type kind
,
1083 unsigned long obj_offset
,
1085 unsigned long *sizep
)
1087 unsigned long base_offset
;
1089 offset
= get_delta_base(p
, w_curs
, offset
, kind
,
1090 obj_offset
, &base_offset
);
1092 /* We choose to only get the type of the base object and
1093 * ignore potentially corrupt pack file that expects the delta
1094 * based on a base with a wrong size. This saves tons of
1097 if (packed_object_info(p
, base_offset
, type
, NULL
))
1098 die("cannot get info for delta-pack base");
1101 const unsigned char *data
;
1102 unsigned char delta_head
[20], *in
;
1103 unsigned long result_size
;
1107 memset(&stream
, 0, sizeof(stream
));
1108 stream
.next_out
= delta_head
;
1109 stream
.avail_out
= sizeof(delta_head
);
1111 inflateInit(&stream
);
1113 in
= use_pack(p
, w_curs
, offset
, &stream
.avail_in
);
1114 stream
.next_in
= in
;
1115 st
= inflate(&stream
, Z_FINISH
);
1116 offset
+= stream
.next_in
- in
;
1117 } while ((st
== Z_OK
|| st
== Z_BUF_ERROR
)
1118 && stream
.total_out
< sizeof(delta_head
));
1119 inflateEnd(&stream
);
1120 if ((st
!= Z_STREAM_END
) &&
1121 stream
.total_out
!= sizeof(delta_head
))
1122 die("delta data unpack-initial failed");
1124 /* Examine the initial part of the delta to figure out
1129 /* ignore base size */
1130 get_delta_hdr_size(&data
, delta_head
+sizeof(delta_head
));
1132 /* Read the result size */
1133 result_size
= get_delta_hdr_size(&data
, delta_head
+sizeof(delta_head
));
1134 *sizep
= result_size
;
1139 static unsigned long unpack_object_header(struct packed_git
*p
,
1140 struct pack_window
**w_curs
,
1141 unsigned long offset
,
1142 enum object_type
*type
,
1143 unsigned long *sizep
)
1145 unsigned char *base
;
1149 /* use_pack() assures us we have [base, base + 20) available
1150 * as a range that we can look at at. (Its actually the hash
1151 * size that is assurred.) With our object header encoding
1152 * the maximum deflated object size is 2^137, which is just
1153 * insane, so we know won't exceed what we have been given.
1155 base
= use_pack(p
, w_curs
, offset
, &left
);
1156 used
= unpack_object_header_gently(base
, left
, type
, sizep
);
1158 die("object offset outside of pack file");
1160 return offset
+ used
;
1163 void packed_object_info_detail(struct packed_git
*p
,
1164 unsigned long offset
,
1166 unsigned long *size
,
1167 unsigned long *store_size
,
1168 unsigned int *delta_chain_length
,
1169 unsigned char *base_sha1
)
1171 struct pack_window
*w_curs
= NULL
;
1172 unsigned long obj_offset
, val
;
1173 unsigned char *next_sha1
;
1174 enum object_type kind
;
1176 *delta_chain_length
= 0;
1177 obj_offset
= offset
;
1178 offset
= unpack_object_header(p
, &w_curs
, offset
, &kind
, size
);
1183 die("pack %s contains unknown object type %d",
1184 p
->pack_name
, kind
);
1189 strcpy(type
, type_names
[kind
]);
1190 *store_size
= 0; /* notyet */
1191 unuse_pack(&w_curs
);
1194 get_delta_base(p
, &w_curs
, offset
, kind
,
1195 obj_offset
, &offset
);
1196 if (*delta_chain_length
== 0) {
1197 /* TODO: find base_sha1 as pointed by offset */
1201 next_sha1
= use_pack(p
, &w_curs
, offset
, NULL
);
1202 if (*delta_chain_length
== 0)
1203 hashcpy(base_sha1
, next_sha1
);
1204 offset
= find_pack_entry_one(next_sha1
, p
);
1207 obj_offset
= offset
;
1208 offset
= unpack_object_header(p
, &w_curs
, offset
, &kind
, &val
);
1209 (*delta_chain_length
)++;
1213 static int packed_object_info(struct packed_git
*p
, unsigned long offset
,
1214 char *type
, unsigned long *sizep
)
1216 struct pack_window
*w_curs
= NULL
;
1217 unsigned long size
, obj_offset
= offset
;
1218 enum object_type kind
;
1221 offset
= unpack_object_header(p
, &w_curs
, offset
, &kind
, &size
);
1226 r
= packed_delta_info(p
, &w_curs
, offset
, kind
,
1227 obj_offset
, type
, sizep
);
1228 unuse_pack(&w_curs
);
1234 strcpy(type
, type_names
[kind
]);
1235 unuse_pack(&w_curs
);
1238 die("pack %s contains unknown object type %d",
1239 p
->pack_name
, kind
);
1246 static void *unpack_compressed_entry(struct packed_git
*p
,
1247 struct pack_window
**w_curs
,
1248 unsigned long offset
,
1253 unsigned char *buffer
, *in
;
1255 buffer
= xmalloc(size
+ 1);
1257 memset(&stream
, 0, sizeof(stream
));
1258 stream
.next_out
= buffer
;
1259 stream
.avail_out
= size
;
1261 inflateInit(&stream
);
1263 in
= use_pack(p
, w_curs
, offset
, &stream
.avail_in
);
1264 stream
.next_in
= in
;
1265 st
= inflate(&stream
, Z_FINISH
);
1266 offset
+= stream
.next_in
- in
;
1267 } while (st
== Z_OK
|| st
== Z_BUF_ERROR
);
1268 inflateEnd(&stream
);
1269 if ((st
!= Z_STREAM_END
) || stream
.total_out
!= size
) {
1277 static void *unpack_delta_entry(struct packed_git
*p
,
1278 struct pack_window
**w_curs
,
1279 unsigned long offset
,
1280 unsigned long delta_size
,
1281 enum object_type kind
,
1282 unsigned long obj_offset
,
1284 unsigned long *sizep
)
1286 void *delta_data
, *result
, *base
;
1287 unsigned long result_size
, base_size
, base_offset
;
1289 offset
= get_delta_base(p
, w_curs
, offset
, kind
,
1290 obj_offset
, &base_offset
);
1291 base
= unpack_entry(p
, base_offset
, type
, &base_size
);
1293 die("failed to read delta base object at %lu from %s",
1294 base_offset
, p
->pack_name
);
1296 delta_data
= unpack_compressed_entry(p
, w_curs
, offset
, delta_size
);
1297 result
= patch_delta(base
, base_size
,
1298 delta_data
, delta_size
,
1301 die("failed to apply delta");
1304 *sizep
= result_size
;
1308 void *unpack_entry(struct packed_git
*p
, unsigned long offset
,
1309 char *type
, unsigned long *sizep
)
1311 struct pack_window
*w_curs
= NULL
;
1312 unsigned long size
, obj_offset
= offset
;
1313 enum object_type kind
;
1316 offset
= unpack_object_header(p
, &w_curs
, offset
, &kind
, &size
);
1320 retval
= unpack_delta_entry(p
, &w_curs
, offset
, size
,
1321 kind
, obj_offset
, type
, sizep
);
1327 strcpy(type
, type_names
[kind
]);
1329 retval
= unpack_compressed_entry(p
, &w_curs
, offset
, size
);
1332 die("unknown object type %i in %s", kind
, p
->pack_name
);
1334 unuse_pack(&w_curs
);
1338 int num_packed_objects(const struct packed_git
*p
)
1340 /* See check_packed_git_idx() */
1341 return (p
->index_size
- 20 - 20 - 4*256) / 24;
1344 int nth_packed_object_sha1(const struct packed_git
*p
, int n
,
1345 unsigned char* sha1
)
1347 void *index
= p
->index_base
+ 256;
1348 if (n
< 0 || num_packed_objects(p
) <= n
)
1350 hashcpy(sha1
, (unsigned char *) index
+ (24 * n
) + 4);
1354 unsigned long find_pack_entry_one(const unsigned char *sha1
,
1355 struct packed_git
*p
)
1357 uint32_t *level1_ofs
= p
->index_base
;
1358 int hi
= ntohl(level1_ofs
[*sha1
]);
1359 int lo
= ((*sha1
== 0x0) ? 0 : ntohl(level1_ofs
[*sha1
- 1]));
1360 void *index
= p
->index_base
+ 256;
1363 int mi
= (lo
+ hi
) / 2;
1364 int cmp
= hashcmp((unsigned char *)index
+ (24 * mi
) + 4, sha1
);
1366 return ntohl(*((uint32_t *)((char *)index
+ (24 * mi
))));
1375 static int matches_pack_name(struct packed_git
*p
, const char *ig
)
1377 const char *last_c
, *c
;
1379 if (!strcmp(p
->pack_name
, ig
))
1382 for (c
= p
->pack_name
, last_c
= c
; *c
;)
1387 if (!strcmp(last_c
, ig
))
1393 static int find_pack_entry(const unsigned char *sha1
, struct pack_entry
*e
, const char **ignore_packed
)
1395 struct packed_git
*p
;
1396 unsigned long offset
;
1398 prepare_packed_git();
1400 for (p
= packed_git
; p
; p
= p
->next
) {
1401 if (ignore_packed
) {
1403 for (ig
= ignore_packed
; *ig
; ig
++)
1404 if (!matches_pack_name(p
, *ig
))
1409 offset
= find_pack_entry_one(sha1
, p
);
1412 * We are about to tell the caller where they can
1413 * locate the requested object. We better make
1414 * sure the packfile is still here and can be
1415 * accessed before supplying that answer, as
1416 * it may have been deleted since the index
1419 if (p
->pack_fd
== -1 && open_packed_git(p
)) {
1420 error("packfile %s cannot be accessed", p
->pack_name
);
1425 hashcpy(e
->sha1
, sha1
);
1432 struct packed_git
*find_sha1_pack(const unsigned char *sha1
,
1433 struct packed_git
*packs
)
1435 struct packed_git
*p
;
1437 for (p
= packs
; p
; p
= p
->next
) {
1438 if (find_pack_entry_one(sha1
, p
))
1445 static int sha1_loose_object_info(const unsigned char *sha1
, char *type
, unsigned long *sizep
)
1448 unsigned long mapsize
, size
;
1453 map
= map_sha1_file(sha1
, &mapsize
);
1455 return error("unable to find %s", sha1_to_hex(sha1
));
1456 if (unpack_sha1_header(&stream
, map
, mapsize
, hdr
, sizeof(hdr
)) < 0)
1457 status
= error("unable to unpack %s header",
1459 if (parse_sha1_header(hdr
, type
, &size
) < 0)
1460 status
= error("unable to parse %s header", sha1_to_hex(sha1
));
1466 inflateEnd(&stream
);
1467 munmap(map
, mapsize
);
1471 int sha1_object_info(const unsigned char *sha1
, char *type
, unsigned long *sizep
)
1473 struct pack_entry e
;
1475 if (!find_pack_entry(sha1
, &e
, NULL
)) {
1476 reprepare_packed_git();
1477 if (!find_pack_entry(sha1
, &e
, NULL
))
1478 return sha1_loose_object_info(sha1
, type
, sizep
);
1480 return packed_object_info(e
.p
, e
.offset
, type
, sizep
);
1483 static void *read_packed_sha1(const unsigned char *sha1
, char *type
, unsigned long *size
)
1485 struct pack_entry e
;
1487 if (!find_pack_entry(sha1
, &e
, NULL
))
1490 return unpack_entry(e
.p
, e
.offset
, type
, size
);
1493 void * read_sha1_file(const unsigned char *sha1
, char *type
, unsigned long *size
)
1495 unsigned long mapsize
;
1498 buf
= read_packed_sha1(sha1
, type
, size
);
1501 map
= map_sha1_file(sha1
, &mapsize
);
1503 buf
= unpack_sha1_file(map
, mapsize
, type
, size
);
1504 munmap(map
, mapsize
);
1507 reprepare_packed_git();
1508 return read_packed_sha1(sha1
, type
, size
);
1511 void *read_object_with_reference(const unsigned char *sha1
,
1512 const char *required_type
,
1513 unsigned long *size
,
1514 unsigned char *actual_sha1_return
)
1518 unsigned long isize
;
1519 unsigned char actual_sha1
[20];
1521 hashcpy(actual_sha1
, sha1
);
1523 int ref_length
= -1;
1524 const char *ref_type
= NULL
;
1526 buffer
= read_sha1_file(actual_sha1
, type
, &isize
);
1529 if (!strcmp(type
, required_type
)) {
1531 if (actual_sha1_return
)
1532 hashcpy(actual_sha1_return
, actual_sha1
);
1535 /* Handle references */
1536 else if (!strcmp(type
, commit_type
))
1538 else if (!strcmp(type
, tag_type
))
1539 ref_type
= "object ";
1544 ref_length
= strlen(ref_type
);
1546 if (memcmp(buffer
, ref_type
, ref_length
) ||
1547 get_sha1_hex((char *) buffer
+ ref_length
, actual_sha1
)) {
1552 /* Now we have the ID of the referred-to object in
1553 * actual_sha1. Check again. */
1557 static void write_sha1_file_prepare(void *buf
, unsigned long len
,
1558 const char *type
, unsigned char *sha1
,
1559 unsigned char *hdr
, int *hdrlen
)
1563 /* Generate the header */
1564 *hdrlen
= sprintf((char *)hdr
, "%s %lu", type
, len
)+1;
1568 SHA1_Update(&c
, hdr
, *hdrlen
);
1569 SHA1_Update(&c
, buf
, len
);
1570 SHA1_Final(sha1
, &c
);
1574 * Link the tempfile to the final place, possibly creating the
1575 * last directory level as you do so.
1577 * Returns the errno on failure, 0 on success.
1579 static int link_temp_to_file(const char *tmpfile
, const char *filename
)
1584 if (!link(tmpfile
, filename
))
1588 * Try to mkdir the last path component if that failed.
1590 * Re-try the "link()" regardless of whether the mkdir
1591 * succeeds, since a race might mean that somebody
1595 dir
= strrchr(filename
, '/');
1598 if (!mkdir(filename
, 0777) && adjust_shared_perm(filename
)) {
1603 if (!link(tmpfile
, filename
))
1611 * Move the just written object into its final resting place
1613 int move_temp_to_file(const char *tmpfile
, const char *filename
)
1615 int ret
= link_temp_to_file(tmpfile
, filename
);
1618 * Coda hack - coda doesn't like cross-directory links,
1619 * so we fall back to a rename, which will mean that it
1620 * won't be able to check collisions, but that's not a
1623 * The same holds for FAT formatted media.
1625 * When this succeeds, we just return 0. We have nothing
1628 if (ret
&& ret
!= EEXIST
) {
1629 if (!rename(tmpfile
, filename
))
1635 if (ret
!= EEXIST
) {
1636 return error("unable to write sha1 filename %s: %s\n", filename
, strerror(ret
));
1638 /* FIXME!!! Collision check here ? */
1644 static int write_buffer(int fd
, const void *buf
, size_t len
)
1646 if (write_in_full(fd
, buf
, len
) < 0)
1647 return error("file write error (%s)", strerror(errno
));
1651 static int write_binary_header(unsigned char *hdr
, enum object_type type
, unsigned long len
)
1656 c
= (type
<< 4) | (len
& 15);
1669 static void setup_object_header(z_stream
*stream
, const char *type
, unsigned long len
)
1673 if (use_legacy_headers
) {
1674 while (deflate(stream
, 0) == Z_OK
)
1678 if (!strcmp(type
, blob_type
))
1679 obj_type
= OBJ_BLOB
;
1680 else if (!strcmp(type
, tree_type
))
1681 obj_type
= OBJ_TREE
;
1682 else if (!strcmp(type
, commit_type
))
1683 obj_type
= OBJ_COMMIT
;
1684 else if (!strcmp(type
, tag_type
))
1687 die("trying to generate bogus object of type '%s'", type
);
1688 hdr
= write_binary_header(stream
->next_out
, obj_type
, len
);
1689 stream
->total_out
= hdr
;
1690 stream
->next_out
+= hdr
;
1691 stream
->avail_out
-= hdr
;
1694 int hash_sha1_file(void *buf
, unsigned long len
, const char *type
,
1695 unsigned char *sha1
)
1697 unsigned char hdr
[50];
1699 write_sha1_file_prepare(buf
, len
, type
, sha1
, hdr
, &hdrlen
);
1703 int write_sha1_file(void *buf
, unsigned long len
, const char *type
, unsigned char *returnsha1
)
1706 unsigned char *compressed
;
1708 unsigned char sha1
[20];
1710 static char tmpfile
[PATH_MAX
];
1711 unsigned char hdr
[50];
1714 /* Normally if we have it in the pack then we do not bother writing
1715 * it out into .git/objects/??/?{38} file.
1717 write_sha1_file_prepare(buf
, len
, type
, sha1
, hdr
, &hdrlen
);
1718 filename
= sha1_file_name(sha1
);
1720 hashcpy(returnsha1
, sha1
);
1721 if (has_sha1_file(sha1
))
1723 fd
= open(filename
, O_RDONLY
);
1726 * FIXME!!! We might do collision checking here, but we'd
1727 * need to uncompress the old file and check it. Later.
1733 if (errno
!= ENOENT
) {
1734 return error("sha1 file %s: %s\n", filename
, strerror(errno
));
1737 snprintf(tmpfile
, sizeof(tmpfile
), "%s/obj_XXXXXX", get_object_directory());
1739 fd
= mkstemp(tmpfile
);
1742 return error("insufficient permission for adding an object to repository database %s\n", get_object_directory());
1744 return error("unable to create temporary sha1 filename %s: %s\n", tmpfile
, strerror(errno
));
1748 memset(&stream
, 0, sizeof(stream
));
1749 deflateInit(&stream
, zlib_compression_level
);
1750 size
= 8 + deflateBound(&stream
, len
+hdrlen
);
1751 compressed
= xmalloc(size
);
1754 stream
.next_out
= compressed
;
1755 stream
.avail_out
= size
;
1757 /* First header.. */
1758 stream
.next_in
= hdr
;
1759 stream
.avail_in
= hdrlen
;
1760 setup_object_header(&stream
, type
, len
);
1762 /* Then the data itself.. */
1763 stream
.next_in
= buf
;
1764 stream
.avail_in
= len
;
1765 while (deflate(&stream
, Z_FINISH
) == Z_OK
)
1767 deflateEnd(&stream
);
1768 size
= stream
.total_out
;
1770 if (write_buffer(fd
, compressed
, size
) < 0)
1771 die("unable to write sha1 file");
1776 return move_temp_to_file(tmpfile
, filename
);
1780 * We need to unpack and recompress the object for writing
1781 * it out to a different file.
1783 static void *repack_object(const unsigned char *sha1
, unsigned long *objsize
)
1787 unsigned char *unpacked
;
1794 /* need to unpack and recompress it by itself */
1795 unpacked
= read_packed_sha1(sha1
, type
, &len
);
1797 error("cannot read sha1_file for %s", sha1_to_hex(sha1
));
1799 hdrlen
= sprintf(hdr
, "%s %lu", type
, len
) + 1;
1802 memset(&stream
, 0, sizeof(stream
));
1803 deflateInit(&stream
, zlib_compression_level
);
1804 size
= deflateBound(&stream
, len
+ hdrlen
);
1805 buf
= xmalloc(size
);
1808 stream
.next_out
= buf
;
1809 stream
.avail_out
= size
;
1811 /* First header.. */
1812 stream
.next_in
= (void *)hdr
;
1813 stream
.avail_in
= hdrlen
;
1814 while (deflate(&stream
, 0) == Z_OK
)
1817 /* Then the data itself.. */
1818 stream
.next_in
= unpacked
;
1819 stream
.avail_in
= len
;
1820 while (deflate(&stream
, Z_FINISH
) == Z_OK
)
1822 deflateEnd(&stream
);
1825 *objsize
= stream
.total_out
;
1829 int write_sha1_to_fd(int fd
, const unsigned char *sha1
)
1832 unsigned long objsize
;
1833 void *buf
= map_sha1_file(sha1
, &objsize
);
1836 retval
= write_buffer(fd
, buf
, objsize
);
1837 munmap(buf
, objsize
);
1841 buf
= repack_object(sha1
, &objsize
);
1842 retval
= write_buffer(fd
, buf
, objsize
);
1847 int write_sha1_from_fd(const unsigned char *sha1
, int fd
, char *buffer
,
1848 size_t bufsize
, size_t *bufposn
)
1850 char tmpfile
[PATH_MAX
];
1853 unsigned char real_sha1
[20];
1854 unsigned char discard
[4096];
1858 snprintf(tmpfile
, sizeof(tmpfile
), "%s/obj_XXXXXX", get_object_directory());
1860 local
= mkstemp(tmpfile
);
1863 return error("insufficient permission for adding an object to repository database %s\n", get_object_directory());
1865 return error("unable to create temporary sha1 filename %s: %s\n", tmpfile
, strerror(errno
));
1868 memset(&stream
, 0, sizeof(stream
));
1870 inflateInit(&stream
);
1877 stream
.avail_in
= *bufposn
;
1878 stream
.next_in
= (unsigned char *) buffer
;
1880 stream
.next_out
= discard
;
1881 stream
.avail_out
= sizeof(discard
);
1882 ret
= inflate(&stream
, Z_SYNC_FLUSH
);
1883 SHA1_Update(&c
, discard
, sizeof(discard
) -
1885 } while (stream
.avail_in
&& ret
== Z_OK
);
1886 if (write_buffer(local
, buffer
, *bufposn
- stream
.avail_in
) < 0)
1887 die("unable to write sha1 file");
1888 memmove(buffer
, buffer
+ *bufposn
- stream
.avail_in
,
1890 *bufposn
= stream
.avail_in
;
1894 size
= xread(fd
, buffer
+ *bufposn
, bufsize
- *bufposn
);
1899 return error("Connection closed?");
1900 perror("Reading from connection");
1905 inflateEnd(&stream
);
1908 SHA1_Final(real_sha1
, &c
);
1909 if (ret
!= Z_STREAM_END
) {
1911 return error("File %s corrupted", sha1_to_hex(sha1
));
1913 if (hashcmp(sha1
, real_sha1
)) {
1915 return error("File %s has bad hash", sha1_to_hex(sha1
));
1918 return move_temp_to_file(tmpfile
, sha1_file_name(sha1
));
1921 int has_pack_index(const unsigned char *sha1
)
1924 if (stat(sha1_pack_index_name(sha1
), &st
))
1929 int has_pack_file(const unsigned char *sha1
)
1932 if (stat(sha1_pack_name(sha1
), &st
))
1937 int has_sha1_pack(const unsigned char *sha1
, const char **ignore_packed
)
1939 struct pack_entry e
;
1940 return find_pack_entry(sha1
, &e
, ignore_packed
);
1943 int has_sha1_file(const unsigned char *sha1
)
1946 struct pack_entry e
;
1948 if (find_pack_entry(sha1
, &e
, NULL
))
1950 return find_sha1_file(sha1
, &st
) ? 1 : 0;
1954 * reads from fd as long as possible into a supplied buffer of size bytes.
1955 * If necessary the buffer's size is increased using realloc()
1957 * returns 0 if anything went fine and -1 otherwise
1959 * NOTE: both buf and size may change, but even when -1 is returned
1960 * you still have to free() it yourself.
1962 int read_pipe(int fd
, char** return_buf
, unsigned long* return_size
)
1964 char* buf
= *return_buf
;
1965 unsigned long size
= *return_size
;
1967 unsigned long off
= 0;
1970 iret
= xread(fd
, buf
+ off
, size
- off
);
1975 buf
= xrealloc(buf
, size
);
1988 int index_pipe(unsigned char *sha1
, int fd
, const char *type
, int write_object
)
1990 unsigned long size
= 4096;
1991 char *buf
= xmalloc(size
);
1994 if (read_pipe(fd
, &buf
, &size
)) {
2002 ret
= write_sha1_file(buf
, size
, type
, sha1
);
2004 ret
= hash_sha1_file(buf
, size
, type
, sha1
);
2009 int index_fd(unsigned char *sha1
, int fd
, struct stat
*st
, int write_object
, const char *type
)
2011 unsigned long size
= st
->st_size
;
2017 buf
= xmmap(NULL
, size
, PROT_READ
, MAP_PRIVATE
, fd
, 0);
2023 ret
= write_sha1_file(buf
, size
, type
, sha1
);
2025 ret
= hash_sha1_file(buf
, size
, type
, sha1
);
2031 int index_path(unsigned char *sha1
, const char *path
, struct stat
*st
, int write_object
)
2036 switch (st
->st_mode
& S_IFMT
) {
2038 fd
= open(path
, O_RDONLY
);
2040 return error("open(\"%s\"): %s", path
,
2042 if (index_fd(sha1
, fd
, st
, write_object
, NULL
) < 0)
2043 return error("%s: failed to insert into database",
2047 target
= xmalloc(st
->st_size
+1);
2048 if (readlink(path
, target
, st
->st_size
+1) != st
->st_size
) {
2049 char *errstr
= strerror(errno
);
2051 return error("readlink(\"%s\"): %s", path
,
2055 hash_sha1_file(target
, st
->st_size
, blob_type
, sha1
);
2056 else if (write_sha1_file(target
, st
->st_size
, blob_type
, sha1
))
2057 return error("%s: failed to insert into database",
2062 return error("%s: unsupported file type", path
);
2067 int read_pack_header(int fd
, struct pack_header
*header
)
2069 char *c
= (char*)header
;
2070 ssize_t remaining
= sizeof(struct pack_header
);
2072 ssize_t r
= xread(fd
, c
, remaining
);
2074 /* "eof before pack header was fully read" */
2075 return PH_ERROR_EOF
;
2078 } while (remaining
> 0);
2079 if (header
->hdr_signature
!= htonl(PACK_SIGNATURE
))
2080 /* "protocol error (pack signature mismatch detected)" */
2081 return PH_ERROR_PACK_SIGNATURE
;
2082 if (!pack_version_ok(header
->hdr_version
))
2083 /* "protocol error (pack version unsupported)" */
2084 return PH_ERROR_PROTOCOL
;