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
;
556 * Do not call this directly as this leaks p->pack_fd on error return;
557 * call open_packed_git() instead.
559 static int open_packed_git_1(struct packed_git
*p
)
562 struct pack_header hdr
;
563 unsigned char sha1
[20];
564 unsigned char *idx_sha1
;
567 p
->pack_fd
= open(p
->pack_name
, O_RDONLY
);
568 if (p
->pack_fd
< 0 || fstat(p
->pack_fd
, &st
))
571 /* If we created the struct before we had the pack we lack size. */
573 if (!S_ISREG(st
.st_mode
))
574 return error("packfile %s not a regular file", p
->pack_name
);
575 p
->pack_size
= st
.st_size
;
576 } else if (p
->pack_size
!= st
.st_size
)
577 return error("packfile %s size changed", p
->pack_name
);
579 /* We leave these file descriptors open with sliding mmap;
580 * there is no point keeping them open across exec(), though.
582 fd_flag
= fcntl(p
->pack_fd
, F_GETFD
, 0);
584 return error("cannot determine file descriptor flags");
585 fd_flag
|= FD_CLOEXEC
;
586 if (fcntl(p
->pack_fd
, F_SETFD
, fd_flag
) == -1)
587 return error("cannot set FD_CLOEXEC");
589 /* Verify we recognize this pack file format. */
590 if (read_in_full(p
->pack_fd
, &hdr
, sizeof(hdr
)) != sizeof(hdr
))
591 return error("file %s is far too short to be a packfile", p
->pack_name
);
592 if (hdr
.hdr_signature
!= htonl(PACK_SIGNATURE
))
593 return error("file %s is not a GIT packfile", p
->pack_name
);
594 if (!pack_version_ok(hdr
.hdr_version
))
595 return error("packfile %s is version %u and not supported"
596 " (try upgrading GIT to a newer version)",
597 p
->pack_name
, ntohl(hdr
.hdr_version
));
599 /* Verify the pack matches its index. */
600 if (num_packed_objects(p
) != ntohl(hdr
.hdr_entries
))
601 return error("packfile %s claims to have %u objects"
602 " while index size indicates %u objects",
603 p
->pack_name
, ntohl(hdr
.hdr_entries
),
604 num_packed_objects(p
));
605 if (lseek(p
->pack_fd
, p
->pack_size
- sizeof(sha1
), SEEK_SET
) == -1)
606 return error("end of packfile %s is unavailable", p
->pack_name
);
607 if (read_in_full(p
->pack_fd
, sha1
, sizeof(sha1
)) != sizeof(sha1
))
608 return error("packfile %s signature is unavailable", p
->pack_name
);
609 idx_sha1
= ((unsigned char *)p
->index_base
) + p
->index_size
- 40;
610 if (hashcmp(sha1
, idx_sha1
))
611 return error("packfile %s does not match index", p
->pack_name
);
615 static int open_packed_git(struct packed_git
*p
)
617 if (!open_packed_git_1(p
))
619 if (p
->pack_fd
!= -1) {
626 static int in_window(struct pack_window
*win
, unsigned long offset
)
628 /* We must promise at least 20 bytes (one hash) after the
629 * offset is available from this window, otherwise the offset
630 * is not actually in this window and a different window (which
631 * has that one hash excess) must be used. This is to support
632 * the object header and delta base parsing routines below.
634 off_t win_off
= win
->offset
;
635 return win_off
<= offset
636 && (offset
+ 20) <= (win_off
+ win
->len
);
639 unsigned char* use_pack(struct packed_git
*p
,
640 struct pack_window
**w_cursor
,
641 unsigned long offset
,
644 struct pack_window
*win
= *w_cursor
;
646 if (p
->pack_fd
== -1 && open_packed_git(p
))
647 die("packfile %s cannot be accessed", p
->pack_name
);
649 /* Since packfiles end in a hash of their content and its
650 * pointless to ask for an offset into the middle of that
651 * hash, and the in_window function above wouldn't match
652 * don't allow an offset too close to the end of the file.
654 if (offset
> (p
->pack_size
- 20))
655 die("offset beyond end of packfile (truncated pack?)");
657 if (!win
|| !in_window(win
, offset
)) {
660 for (win
= p
->windows
; win
; win
= win
->next
) {
661 if (in_window(win
, offset
))
666 page_size
= getpagesize();
667 win
= xcalloc(1, sizeof(*win
));
668 win
->offset
= (offset
/ page_size
) * page_size
;
669 win
->len
= p
->pack_size
- win
->offset
;
670 if (win
->len
> packed_git_window_size
)
671 win
->len
= packed_git_window_size
;
672 pack_mapped
+= win
->len
;
673 while (packed_git_limit
< pack_mapped
674 && unuse_one_window(p
))
676 win
->base
= xmmap(NULL
, win
->len
,
677 PROT_READ
, MAP_PRIVATE
,
678 p
->pack_fd
, win
->offset
);
679 if (win
->base
== MAP_FAILED
)
680 die("packfile %s cannot be mapped: %s",
685 if (pack_mapped
> peak_pack_mapped
)
686 peak_pack_mapped
= pack_mapped
;
687 if (pack_open_windows
> peak_pack_open_windows
)
688 peak_pack_open_windows
= pack_open_windows
;
689 win
->next
= p
->windows
;
693 if (win
!= *w_cursor
) {
694 win
->last_used
= pack_used_ctr
++;
698 offset
-= win
->offset
;
700 *left
= win
->len
- offset
;
701 return win
->base
+ offset
;
704 struct packed_git
*add_packed_git(char *path
, int path_len
, int local
)
707 struct packed_git
*p
;
708 unsigned long idx_size
;
710 unsigned char sha1
[20];
712 if (check_packed_git_idx(path
, &idx_size
, &idx_map
))
715 /* do we have a corresponding .pack file? */
716 strcpy(path
+ path_len
- 4, ".pack");
717 if (stat(path
, &st
) || !S_ISREG(st
.st_mode
)) {
718 munmap(idx_map
, idx_size
);
721 /* ok, it looks sane as far as we can check without
722 * actually mapping the pack file.
724 p
= xmalloc(sizeof(*p
) + path_len
+ 2);
725 strcpy(p
->pack_name
, path
);
726 p
->index_size
= idx_size
;
727 p
->pack_size
= st
.st_size
;
728 p
->index_base
= idx_map
;
732 p
->pack_local
= local
;
733 if ((path_len
> 44) && !get_sha1_hex(path
+ path_len
- 44, sha1
))
734 hashcpy(p
->sha1
, sha1
);
738 struct packed_git
*parse_pack_index(unsigned char *sha1
)
740 char *path
= sha1_pack_index_name(sha1
);
741 return parse_pack_index_file(sha1
, path
);
744 struct packed_git
*parse_pack_index_file(const unsigned char *sha1
, char *idx_path
)
746 struct packed_git
*p
;
747 unsigned long idx_size
;
751 if (check_packed_git_idx(idx_path
, &idx_size
, &idx_map
))
754 path
= sha1_pack_name(sha1
);
756 p
= xmalloc(sizeof(*p
) + strlen(path
) + 2);
757 strcpy(p
->pack_name
, path
);
758 p
->index_size
= idx_size
;
760 p
->index_base
= idx_map
;
764 hashcpy(p
->sha1
, sha1
);
768 void install_packed_git(struct packed_git
*pack
)
770 pack
->next
= packed_git
;
774 static void prepare_packed_git_one(char *objdir
, int local
)
781 sprintf(path
, "%s/pack", objdir
);
786 error("unable to open object pack directory: %s: %s",
787 path
, strerror(errno
));
791 while ((de
= readdir(dir
)) != NULL
) {
792 int namelen
= strlen(de
->d_name
);
793 struct packed_git
*p
;
795 if (!has_extension(de
->d_name
, ".idx"))
798 /* Don't reopen a pack we already have. */
799 strcpy(path
+ len
, de
->d_name
);
800 for (p
= packed_git
; p
; p
= p
->next
) {
801 if (!memcmp(path
, p
->pack_name
, len
+ namelen
- 4))
806 /* See if it really is a valid .idx file with corresponding
807 * .pack file that we can map.
809 p
= add_packed_git(path
, len
+ namelen
, local
);
812 install_packed_git(p
);
817 static int prepare_packed_git_run_once
= 0;
818 void prepare_packed_git(void)
820 struct alternate_object_database
*alt
;
822 if (prepare_packed_git_run_once
)
824 prepare_packed_git_one(get_object_directory(), 1);
826 for (alt
= alt_odb_list
; alt
; alt
= alt
->next
) {
828 prepare_packed_git_one(alt
->base
, 0);
831 prepare_packed_git_run_once
= 1;
834 void reprepare_packed_git(void)
836 prepare_packed_git_run_once
= 0;
837 prepare_packed_git();
840 int check_sha1_signature(const unsigned char *sha1
, void *map
, unsigned long size
, const char *type
)
842 unsigned char real_sha1
[20];
843 hash_sha1_file(map
, size
, type
, real_sha1
);
844 return hashcmp(sha1
, real_sha1
) ? -1 : 0;
847 void *map_sha1_file(const unsigned char *sha1
, unsigned long *size
)
852 char *filename
= find_sha1_file(sha1
, &st
);
858 fd
= open(filename
, O_RDONLY
| sha1_file_open_flag
);
860 /* See if it works without O_NOATIME */
861 switch (sha1_file_open_flag
) {
863 fd
= open(filename
, O_RDONLY
);
871 /* If it failed once, it will probably fail again.
872 * Stop using O_NOATIME
874 sha1_file_open_flag
= 0;
876 map
= xmmap(NULL
, st
.st_size
, PROT_READ
, MAP_PRIVATE
, fd
, 0);
882 int legacy_loose_object(unsigned char *map
)
887 * Is it a zlib-compressed buffer? If so, the first byte
888 * must be 0x78 (15-bit window size, deflated), and the
889 * first 16-bit word is evenly divisible by 31
891 word
= (map
[0] << 8) + map
[1];
892 if (map
[0] == 0x78 && !(word
% 31))
898 unsigned long unpack_object_header_gently(const unsigned char *buf
, unsigned long len
, enum object_type
*type
, unsigned long *sizep
)
903 unsigned long used
= 0;
906 *type
= (c
>> 4) & 7;
912 if (sizeof(long) * 8 <= shift
)
915 size
+= (c
& 0x7f) << shift
;
922 static int unpack_sha1_header(z_stream
*stream
, unsigned char *map
, unsigned long mapsize
, void *buffer
, unsigned long bufsiz
)
924 unsigned long size
, used
;
925 static const char valid_loose_object_type
[8] = {
927 1, 1, 1, 1, /* "commit", "tree", "blob", "tag" */
928 0, /* "delta" and others are invalid in a loose object */
930 enum object_type type
;
932 /* Get the data stream */
933 memset(stream
, 0, sizeof(*stream
));
934 stream
->next_in
= map
;
935 stream
->avail_in
= mapsize
;
936 stream
->next_out
= buffer
;
937 stream
->avail_out
= bufsiz
;
939 if (legacy_loose_object(map
)) {
941 return inflate(stream
, 0);
944 used
= unpack_object_header_gently(map
, mapsize
, &type
, &size
);
945 if (!used
|| !valid_loose_object_type
[type
])
950 /* Set up the stream for the rest.. */
951 stream
->next_in
= map
;
952 stream
->avail_in
= mapsize
;
955 /* And generate the fake traditional header */
956 stream
->total_out
= 1 + snprintf(buffer
, bufsiz
, "%s %lu",
957 type_names
[type
], size
);
961 static void *unpack_sha1_rest(z_stream
*stream
, void *buffer
, unsigned long size
)
963 int bytes
= strlen(buffer
) + 1;
964 unsigned char *buf
= xmalloc(1+size
);
967 n
= stream
->total_out
- bytes
;
970 memcpy(buf
, (char *) buffer
+ bytes
, n
);
973 stream
->next_out
= buf
+ bytes
;
974 stream
->avail_out
= size
- bytes
;
975 while (inflate(stream
, Z_FINISH
) == Z_OK
)
984 * We used to just use "sscanf()", but that's actually way
985 * too permissive for what we want to check. So do an anal
986 * object header parse by hand.
988 static int parse_sha1_header(char *hdr
, char *type
, unsigned long *sizep
)
994 * The type can be at most ten bytes (including the
995 * terminating '\0' that we add), and is followed by
1010 * The length must follow immediately, and be in canonical
1011 * decimal format (ie "010" is not valid).
1013 size
= *hdr
++ - '0';
1018 unsigned long c
= *hdr
- '0';
1022 size
= size
* 10 + c
;
1028 * The length must be followed by a zero byte
1030 return *hdr
? -1 : 0;
1033 void * unpack_sha1_file(void *map
, unsigned long mapsize
, char *type
, unsigned long *size
)
1039 ret
= unpack_sha1_header(&stream
, map
, mapsize
, hdr
, sizeof(hdr
));
1040 if (ret
< Z_OK
|| parse_sha1_header(hdr
, type
, size
) < 0)
1043 return unpack_sha1_rest(&stream
, hdr
, *size
);
1046 static unsigned long get_delta_base(struct packed_git
*p
,
1047 struct pack_window
**w_curs
,
1048 unsigned long offset
,
1049 enum object_type kind
,
1050 unsigned long delta_obj_offset
,
1051 unsigned long *base_obj_offset
)
1053 unsigned char *base_info
= use_pack(p
, w_curs
, offset
, NULL
);
1054 unsigned long base_offset
;
1056 /* use_pack() assured us we have [base_info, base_info + 20)
1057 * as a range that we can look at without walking off the
1058 * end of the mapped window. Its actually the hash size
1059 * that is assured. An OFS_DELTA longer than the hash size
1060 * is stupid, as then a REF_DELTA would be smaller to store.
1062 if (kind
== OBJ_OFS_DELTA
) {
1064 unsigned char c
= base_info
[used
++];
1065 base_offset
= c
& 127;
1068 if (!base_offset
|| base_offset
& ~(~0UL >> 7))
1069 die("offset value overflow for delta base object");
1070 c
= base_info
[used
++];
1071 base_offset
= (base_offset
<< 7) + (c
& 127);
1073 base_offset
= delta_obj_offset
- base_offset
;
1074 if (base_offset
>= delta_obj_offset
)
1075 die("delta base offset out of bound");
1077 } else if (kind
== OBJ_REF_DELTA
) {
1078 /* The base entry _must_ be in the same pack */
1079 base_offset
= find_pack_entry_one(base_info
, p
);
1081 die("failed to find delta-pack base object %s",
1082 sha1_to_hex(base_info
));
1085 die("I am totally screwed");
1086 *base_obj_offset
= base_offset
;
1090 /* forward declaration for a mutually recursive function */
1091 static int packed_object_info(struct packed_git
*p
, unsigned long offset
,
1092 char *type
, unsigned long *sizep
);
1094 static int packed_delta_info(struct packed_git
*p
,
1095 struct pack_window
**w_curs
,
1096 unsigned long offset
,
1097 enum object_type kind
,
1098 unsigned long obj_offset
,
1100 unsigned long *sizep
)
1102 unsigned long base_offset
;
1104 offset
= get_delta_base(p
, w_curs
, offset
, kind
,
1105 obj_offset
, &base_offset
);
1107 /* We choose to only get the type of the base object and
1108 * ignore potentially corrupt pack file that expects the delta
1109 * based on a base with a wrong size. This saves tons of
1112 if (packed_object_info(p
, base_offset
, type
, NULL
))
1113 die("cannot get info for delta-pack base");
1116 const unsigned char *data
;
1117 unsigned char delta_head
[20], *in
;
1118 unsigned long result_size
;
1122 memset(&stream
, 0, sizeof(stream
));
1123 stream
.next_out
= delta_head
;
1124 stream
.avail_out
= sizeof(delta_head
);
1126 inflateInit(&stream
);
1128 in
= use_pack(p
, w_curs
, offset
, &stream
.avail_in
);
1129 stream
.next_in
= in
;
1130 st
= inflate(&stream
, Z_FINISH
);
1131 offset
+= stream
.next_in
- in
;
1132 } while ((st
== Z_OK
|| st
== Z_BUF_ERROR
)
1133 && stream
.total_out
< sizeof(delta_head
));
1134 inflateEnd(&stream
);
1135 if ((st
!= Z_STREAM_END
) &&
1136 stream
.total_out
!= sizeof(delta_head
))
1137 die("delta data unpack-initial failed");
1139 /* Examine the initial part of the delta to figure out
1144 /* ignore base size */
1145 get_delta_hdr_size(&data
, delta_head
+sizeof(delta_head
));
1147 /* Read the result size */
1148 result_size
= get_delta_hdr_size(&data
, delta_head
+sizeof(delta_head
));
1149 *sizep
= result_size
;
1154 static unsigned long unpack_object_header(struct packed_git
*p
,
1155 struct pack_window
**w_curs
,
1156 unsigned long offset
,
1157 enum object_type
*type
,
1158 unsigned long *sizep
)
1160 unsigned char *base
;
1164 /* use_pack() assures us we have [base, base + 20) available
1165 * as a range that we can look at at. (Its actually the hash
1166 * size that is assured.) With our object header encoding
1167 * the maximum deflated object size is 2^137, which is just
1168 * insane, so we know won't exceed what we have been given.
1170 base
= use_pack(p
, w_curs
, offset
, &left
);
1171 used
= unpack_object_header_gently(base
, left
, type
, sizep
);
1173 die("object offset outside of pack file");
1175 return offset
+ used
;
1178 void packed_object_info_detail(struct packed_git
*p
,
1179 unsigned long offset
,
1181 unsigned long *size
,
1182 unsigned long *store_size
,
1183 unsigned int *delta_chain_length
,
1184 unsigned char *base_sha1
)
1186 struct pack_window
*w_curs
= NULL
;
1187 unsigned long obj_offset
, val
;
1188 unsigned char *next_sha1
;
1189 enum object_type kind
;
1191 *delta_chain_length
= 0;
1192 obj_offset
= offset
;
1193 offset
= unpack_object_header(p
, &w_curs
, offset
, &kind
, size
);
1198 die("pack %s contains unknown object type %d",
1199 p
->pack_name
, kind
);
1204 strcpy(type
, type_names
[kind
]);
1205 *store_size
= 0; /* notyet */
1206 unuse_pack(&w_curs
);
1209 get_delta_base(p
, &w_curs
, offset
, kind
,
1210 obj_offset
, &offset
);
1211 if (*delta_chain_length
== 0) {
1212 /* TODO: find base_sha1 as pointed by offset */
1216 next_sha1
= use_pack(p
, &w_curs
, offset
, NULL
);
1217 if (*delta_chain_length
== 0)
1218 hashcpy(base_sha1
, next_sha1
);
1219 offset
= find_pack_entry_one(next_sha1
, p
);
1222 obj_offset
= offset
;
1223 offset
= unpack_object_header(p
, &w_curs
, offset
, &kind
, &val
);
1224 (*delta_chain_length
)++;
1228 static int packed_object_info(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
);
1241 r
= packed_delta_info(p
, &w_curs
, offset
, kind
,
1242 obj_offset
, type
, sizep
);
1243 unuse_pack(&w_curs
);
1249 strcpy(type
, type_names
[kind
]);
1250 unuse_pack(&w_curs
);
1253 die("pack %s contains unknown object type %d",
1254 p
->pack_name
, kind
);
1261 static void *unpack_compressed_entry(struct packed_git
*p
,
1262 struct pack_window
**w_curs
,
1263 unsigned long offset
,
1268 unsigned char *buffer
, *in
;
1270 buffer
= xmalloc(size
+ 1);
1272 memset(&stream
, 0, sizeof(stream
));
1273 stream
.next_out
= buffer
;
1274 stream
.avail_out
= size
;
1276 inflateInit(&stream
);
1278 in
= use_pack(p
, w_curs
, offset
, &stream
.avail_in
);
1279 stream
.next_in
= in
;
1280 st
= inflate(&stream
, Z_FINISH
);
1281 offset
+= stream
.next_in
- in
;
1282 } while (st
== Z_OK
|| st
== Z_BUF_ERROR
);
1283 inflateEnd(&stream
);
1284 if ((st
!= Z_STREAM_END
) || stream
.total_out
!= size
) {
1292 static void *unpack_delta_entry(struct packed_git
*p
,
1293 struct pack_window
**w_curs
,
1294 unsigned long offset
,
1295 unsigned long delta_size
,
1296 enum object_type kind
,
1297 unsigned long obj_offset
,
1299 unsigned long *sizep
)
1301 void *delta_data
, *result
, *base
;
1302 unsigned long result_size
, base_size
, base_offset
;
1304 offset
= get_delta_base(p
, w_curs
, offset
, kind
,
1305 obj_offset
, &base_offset
);
1306 base
= unpack_entry(p
, base_offset
, type
, &base_size
);
1308 die("failed to read delta base object at %lu from %s",
1309 base_offset
, p
->pack_name
);
1311 delta_data
= unpack_compressed_entry(p
, w_curs
, offset
, delta_size
);
1312 result
= patch_delta(base
, base_size
,
1313 delta_data
, delta_size
,
1316 die("failed to apply delta");
1319 *sizep
= result_size
;
1323 void *unpack_entry(struct packed_git
*p
, unsigned long offset
,
1324 char *type
, unsigned long *sizep
)
1326 struct pack_window
*w_curs
= NULL
;
1327 unsigned long size
, obj_offset
= offset
;
1328 enum object_type kind
;
1331 offset
= unpack_object_header(p
, &w_curs
, offset
, &kind
, &size
);
1335 retval
= unpack_delta_entry(p
, &w_curs
, offset
, size
,
1336 kind
, obj_offset
, type
, sizep
);
1342 strcpy(type
, type_names
[kind
]);
1344 retval
= unpack_compressed_entry(p
, &w_curs
, offset
, size
);
1347 die("unknown object type %i in %s", kind
, p
->pack_name
);
1349 unuse_pack(&w_curs
);
1353 int num_packed_objects(const struct packed_git
*p
)
1355 /* See check_packed_git_idx() */
1356 return (p
->index_size
- 20 - 20 - 4*256) / 24;
1359 int nth_packed_object_sha1(const struct packed_git
*p
, int n
,
1360 unsigned char* sha1
)
1362 void *index
= p
->index_base
+ 256;
1363 if (n
< 0 || num_packed_objects(p
) <= n
)
1365 hashcpy(sha1
, (unsigned char *) index
+ (24 * n
) + 4);
1369 unsigned long find_pack_entry_one(const unsigned char *sha1
,
1370 struct packed_git
*p
)
1372 uint32_t *level1_ofs
= p
->index_base
;
1373 int hi
= ntohl(level1_ofs
[*sha1
]);
1374 int lo
= ((*sha1
== 0x0) ? 0 : ntohl(level1_ofs
[*sha1
- 1]));
1375 void *index
= p
->index_base
+ 256;
1378 int mi
= (lo
+ hi
) / 2;
1379 int cmp
= hashcmp((unsigned char *)index
+ (24 * mi
) + 4, sha1
);
1381 return ntohl(*((uint32_t *)((char *)index
+ (24 * mi
))));
1390 static int matches_pack_name(struct packed_git
*p
, const char *ig
)
1392 const char *last_c
, *c
;
1394 if (!strcmp(p
->pack_name
, ig
))
1397 for (c
= p
->pack_name
, last_c
= c
; *c
;)
1402 if (!strcmp(last_c
, ig
))
1408 static int find_pack_entry(const unsigned char *sha1
, struct pack_entry
*e
, const char **ignore_packed
)
1410 struct packed_git
*p
;
1411 unsigned long offset
;
1413 prepare_packed_git();
1415 for (p
= packed_git
; p
; p
= p
->next
) {
1416 if (ignore_packed
) {
1418 for (ig
= ignore_packed
; *ig
; ig
++)
1419 if (!matches_pack_name(p
, *ig
))
1424 offset
= find_pack_entry_one(sha1
, p
);
1427 * We are about to tell the caller where they can
1428 * locate the requested object. We better make
1429 * sure the packfile is still here and can be
1430 * accessed before supplying that answer, as
1431 * it may have been deleted since the index
1434 if (p
->pack_fd
== -1 && open_packed_git(p
)) {
1435 error("packfile %s cannot be accessed", p
->pack_name
);
1440 hashcpy(e
->sha1
, sha1
);
1447 struct packed_git
*find_sha1_pack(const unsigned char *sha1
,
1448 struct packed_git
*packs
)
1450 struct packed_git
*p
;
1452 for (p
= packs
; p
; p
= p
->next
) {
1453 if (find_pack_entry_one(sha1
, p
))
1460 static int sha1_loose_object_info(const unsigned char *sha1
, char *type
, unsigned long *sizep
)
1463 unsigned long mapsize
, size
;
1468 map
= map_sha1_file(sha1
, &mapsize
);
1470 return error("unable to find %s", sha1_to_hex(sha1
));
1471 if (unpack_sha1_header(&stream
, map
, mapsize
, hdr
, sizeof(hdr
)) < 0)
1472 status
= error("unable to unpack %s header",
1474 if (parse_sha1_header(hdr
, type
, &size
) < 0)
1475 status
= error("unable to parse %s header", sha1_to_hex(sha1
));
1481 inflateEnd(&stream
);
1482 munmap(map
, mapsize
);
1486 int sha1_object_info(const unsigned char *sha1
, char *type
, unsigned long *sizep
)
1488 struct pack_entry e
;
1490 if (!find_pack_entry(sha1
, &e
, NULL
)) {
1491 reprepare_packed_git();
1492 if (!find_pack_entry(sha1
, &e
, NULL
))
1493 return sha1_loose_object_info(sha1
, type
, sizep
);
1495 return packed_object_info(e
.p
, e
.offset
, type
, sizep
);
1498 static void *read_packed_sha1(const unsigned char *sha1
, char *type
, unsigned long *size
)
1500 struct pack_entry e
;
1502 if (!find_pack_entry(sha1
, &e
, NULL
))
1505 return unpack_entry(e
.p
, e
.offset
, type
, size
);
1508 void * read_sha1_file(const unsigned char *sha1
, char *type
, unsigned long *size
)
1510 unsigned long mapsize
;
1513 buf
= read_packed_sha1(sha1
, type
, size
);
1516 map
= map_sha1_file(sha1
, &mapsize
);
1518 buf
= unpack_sha1_file(map
, mapsize
, type
, size
);
1519 munmap(map
, mapsize
);
1522 reprepare_packed_git();
1523 return read_packed_sha1(sha1
, type
, size
);
1526 void *read_object_with_reference(const unsigned char *sha1
,
1527 const char *required_type
,
1528 unsigned long *size
,
1529 unsigned char *actual_sha1_return
)
1533 unsigned long isize
;
1534 unsigned char actual_sha1
[20];
1536 hashcpy(actual_sha1
, sha1
);
1538 int ref_length
= -1;
1539 const char *ref_type
= NULL
;
1541 buffer
= read_sha1_file(actual_sha1
, type
, &isize
);
1544 if (!strcmp(type
, required_type
)) {
1546 if (actual_sha1_return
)
1547 hashcpy(actual_sha1_return
, actual_sha1
);
1550 /* Handle references */
1551 else if (!strcmp(type
, commit_type
))
1553 else if (!strcmp(type
, tag_type
))
1554 ref_type
= "object ";
1559 ref_length
= strlen(ref_type
);
1561 if (memcmp(buffer
, ref_type
, ref_length
) ||
1562 get_sha1_hex((char *) buffer
+ ref_length
, actual_sha1
)) {
1567 /* Now we have the ID of the referred-to object in
1568 * actual_sha1. Check again. */
1572 static void write_sha1_file_prepare(void *buf
, unsigned long len
,
1573 const char *type
, unsigned char *sha1
,
1574 unsigned char *hdr
, int *hdrlen
)
1578 /* Generate the header */
1579 *hdrlen
= sprintf((char *)hdr
, "%s %lu", type
, len
)+1;
1583 SHA1_Update(&c
, hdr
, *hdrlen
);
1584 SHA1_Update(&c
, buf
, len
);
1585 SHA1_Final(sha1
, &c
);
1589 * Link the tempfile to the final place, possibly creating the
1590 * last directory level as you do so.
1592 * Returns the errno on failure, 0 on success.
1594 static int link_temp_to_file(const char *tmpfile
, const char *filename
)
1599 if (!link(tmpfile
, filename
))
1603 * Try to mkdir the last path component if that failed.
1605 * Re-try the "link()" regardless of whether the mkdir
1606 * succeeds, since a race might mean that somebody
1610 dir
= strrchr(filename
, '/');
1613 if (!mkdir(filename
, 0777) && adjust_shared_perm(filename
)) {
1618 if (!link(tmpfile
, filename
))
1626 * Move the just written object into its final resting place
1628 int move_temp_to_file(const char *tmpfile
, const char *filename
)
1630 int ret
= link_temp_to_file(tmpfile
, filename
);
1633 * Coda hack - coda doesn't like cross-directory links,
1634 * so we fall back to a rename, which will mean that it
1635 * won't be able to check collisions, but that's not a
1638 * The same holds for FAT formatted media.
1640 * When this succeeds, we just return 0. We have nothing
1643 if (ret
&& ret
!= EEXIST
) {
1644 if (!rename(tmpfile
, filename
))
1650 if (ret
!= EEXIST
) {
1651 return error("unable to write sha1 filename %s: %s\n", filename
, strerror(ret
));
1653 /* FIXME!!! Collision check here ? */
1659 static int write_buffer(int fd
, const void *buf
, size_t len
)
1661 if (write_in_full(fd
, buf
, len
) < 0)
1662 return error("file write error (%s)", strerror(errno
));
1666 static int write_binary_header(unsigned char *hdr
, enum object_type type
, unsigned long len
)
1671 c
= (type
<< 4) | (len
& 15);
1684 static void setup_object_header(z_stream
*stream
, const char *type
, unsigned long len
)
1688 if (use_legacy_headers
) {
1689 while (deflate(stream
, 0) == Z_OK
)
1693 if (!strcmp(type
, blob_type
))
1694 obj_type
= OBJ_BLOB
;
1695 else if (!strcmp(type
, tree_type
))
1696 obj_type
= OBJ_TREE
;
1697 else if (!strcmp(type
, commit_type
))
1698 obj_type
= OBJ_COMMIT
;
1699 else if (!strcmp(type
, tag_type
))
1702 die("trying to generate bogus object of type '%s'", type
);
1703 hdr
= write_binary_header(stream
->next_out
, obj_type
, len
);
1704 stream
->total_out
= hdr
;
1705 stream
->next_out
+= hdr
;
1706 stream
->avail_out
-= hdr
;
1709 int hash_sha1_file(void *buf
, unsigned long len
, const char *type
,
1710 unsigned char *sha1
)
1712 unsigned char hdr
[50];
1714 write_sha1_file_prepare(buf
, len
, type
, sha1
, hdr
, &hdrlen
);
1718 int write_sha1_file(void *buf
, unsigned long len
, const char *type
, unsigned char *returnsha1
)
1721 unsigned char *compressed
;
1723 unsigned char sha1
[20];
1725 static char tmpfile
[PATH_MAX
];
1726 unsigned char hdr
[50];
1729 /* Normally if we have it in the pack then we do not bother writing
1730 * it out into .git/objects/??/?{38} file.
1732 write_sha1_file_prepare(buf
, len
, type
, sha1
, hdr
, &hdrlen
);
1733 filename
= sha1_file_name(sha1
);
1735 hashcpy(returnsha1
, sha1
);
1736 if (has_sha1_file(sha1
))
1738 fd
= open(filename
, O_RDONLY
);
1741 * FIXME!!! We might do collision checking here, but we'd
1742 * need to uncompress the old file and check it. Later.
1748 if (errno
!= ENOENT
) {
1749 return error("sha1 file %s: %s\n", filename
, strerror(errno
));
1752 snprintf(tmpfile
, sizeof(tmpfile
), "%s/obj_XXXXXX", get_object_directory());
1754 fd
= mkstemp(tmpfile
);
1757 return error("insufficient permission for adding an object to repository database %s\n", get_object_directory());
1759 return error("unable to create temporary sha1 filename %s: %s\n", tmpfile
, strerror(errno
));
1763 memset(&stream
, 0, sizeof(stream
));
1764 deflateInit(&stream
, zlib_compression_level
);
1765 size
= 8 + deflateBound(&stream
, len
+hdrlen
);
1766 compressed
= xmalloc(size
);
1769 stream
.next_out
= compressed
;
1770 stream
.avail_out
= size
;
1772 /* First header.. */
1773 stream
.next_in
= hdr
;
1774 stream
.avail_in
= hdrlen
;
1775 setup_object_header(&stream
, type
, len
);
1777 /* Then the data itself.. */
1778 stream
.next_in
= buf
;
1779 stream
.avail_in
= len
;
1780 while (deflate(&stream
, Z_FINISH
) == Z_OK
)
1782 deflateEnd(&stream
);
1783 size
= stream
.total_out
;
1785 if (write_buffer(fd
, compressed
, size
) < 0)
1786 die("unable to write sha1 file");
1791 return move_temp_to_file(tmpfile
, filename
);
1795 * We need to unpack and recompress the object for writing
1796 * it out to a different file.
1798 static void *repack_object(const unsigned char *sha1
, unsigned long *objsize
)
1802 unsigned char *unpacked
;
1809 /* need to unpack and recompress it by itself */
1810 unpacked
= read_packed_sha1(sha1
, type
, &len
);
1812 error("cannot read sha1_file for %s", sha1_to_hex(sha1
));
1814 hdrlen
= sprintf(hdr
, "%s %lu", type
, len
) + 1;
1817 memset(&stream
, 0, sizeof(stream
));
1818 deflateInit(&stream
, zlib_compression_level
);
1819 size
= deflateBound(&stream
, len
+ hdrlen
);
1820 buf
= xmalloc(size
);
1823 stream
.next_out
= buf
;
1824 stream
.avail_out
= size
;
1826 /* First header.. */
1827 stream
.next_in
= (void *)hdr
;
1828 stream
.avail_in
= hdrlen
;
1829 while (deflate(&stream
, 0) == Z_OK
)
1832 /* Then the data itself.. */
1833 stream
.next_in
= unpacked
;
1834 stream
.avail_in
= len
;
1835 while (deflate(&stream
, Z_FINISH
) == Z_OK
)
1837 deflateEnd(&stream
);
1840 *objsize
= stream
.total_out
;
1844 int write_sha1_to_fd(int fd
, const unsigned char *sha1
)
1847 unsigned long objsize
;
1848 void *buf
= map_sha1_file(sha1
, &objsize
);
1851 retval
= write_buffer(fd
, buf
, objsize
);
1852 munmap(buf
, objsize
);
1856 buf
= repack_object(sha1
, &objsize
);
1857 retval
= write_buffer(fd
, buf
, objsize
);
1862 int write_sha1_from_fd(const unsigned char *sha1
, int fd
, char *buffer
,
1863 size_t bufsize
, size_t *bufposn
)
1865 char tmpfile
[PATH_MAX
];
1868 unsigned char real_sha1
[20];
1869 unsigned char discard
[4096];
1873 snprintf(tmpfile
, sizeof(tmpfile
), "%s/obj_XXXXXX", get_object_directory());
1875 local
= mkstemp(tmpfile
);
1878 return error("insufficient permission for adding an object to repository database %s\n", get_object_directory());
1880 return error("unable to create temporary sha1 filename %s: %s\n", tmpfile
, strerror(errno
));
1883 memset(&stream
, 0, sizeof(stream
));
1885 inflateInit(&stream
);
1892 stream
.avail_in
= *bufposn
;
1893 stream
.next_in
= (unsigned char *) buffer
;
1895 stream
.next_out
= discard
;
1896 stream
.avail_out
= sizeof(discard
);
1897 ret
= inflate(&stream
, Z_SYNC_FLUSH
);
1898 SHA1_Update(&c
, discard
, sizeof(discard
) -
1900 } while (stream
.avail_in
&& ret
== Z_OK
);
1901 if (write_buffer(local
, buffer
, *bufposn
- stream
.avail_in
) < 0)
1902 die("unable to write sha1 file");
1903 memmove(buffer
, buffer
+ *bufposn
- stream
.avail_in
,
1905 *bufposn
= stream
.avail_in
;
1909 size
= xread(fd
, buffer
+ *bufposn
, bufsize
- *bufposn
);
1914 return error("Connection closed?");
1915 perror("Reading from connection");
1920 inflateEnd(&stream
);
1923 SHA1_Final(real_sha1
, &c
);
1924 if (ret
!= Z_STREAM_END
) {
1926 return error("File %s corrupted", sha1_to_hex(sha1
));
1928 if (hashcmp(sha1
, real_sha1
)) {
1930 return error("File %s has bad hash", sha1_to_hex(sha1
));
1933 return move_temp_to_file(tmpfile
, sha1_file_name(sha1
));
1936 int has_pack_index(const unsigned char *sha1
)
1939 if (stat(sha1_pack_index_name(sha1
), &st
))
1944 int has_pack_file(const unsigned char *sha1
)
1947 if (stat(sha1_pack_name(sha1
), &st
))
1952 int has_sha1_pack(const unsigned char *sha1
, const char **ignore_packed
)
1954 struct pack_entry e
;
1955 return find_pack_entry(sha1
, &e
, ignore_packed
);
1958 int has_sha1_file(const unsigned char *sha1
)
1961 struct pack_entry e
;
1963 if (find_pack_entry(sha1
, &e
, NULL
))
1965 return find_sha1_file(sha1
, &st
) ? 1 : 0;
1969 * reads from fd as long as possible into a supplied buffer of size bytes.
1970 * If necessary the buffer's size is increased using realloc()
1972 * returns 0 if anything went fine and -1 otherwise
1974 * NOTE: both buf and size may change, but even when -1 is returned
1975 * you still have to free() it yourself.
1977 int read_pipe(int fd
, char** return_buf
, unsigned long* return_size
)
1979 char* buf
= *return_buf
;
1980 unsigned long size
= *return_size
;
1982 unsigned long off
= 0;
1985 iret
= xread(fd
, buf
+ off
, size
- off
);
1990 buf
= xrealloc(buf
, size
);
2003 int index_pipe(unsigned char *sha1
, int fd
, const char *type
, int write_object
)
2005 unsigned long size
= 4096;
2006 char *buf
= xmalloc(size
);
2009 if (read_pipe(fd
, &buf
, &size
)) {
2017 ret
= write_sha1_file(buf
, size
, type
, sha1
);
2019 ret
= hash_sha1_file(buf
, size
, type
, sha1
);
2024 int index_fd(unsigned char *sha1
, int fd
, struct stat
*st
, int write_object
, const char *type
)
2026 unsigned long size
= st
->st_size
;
2032 buf
= xmmap(NULL
, size
, PROT_READ
, MAP_PRIVATE
, fd
, 0);
2038 ret
= write_sha1_file(buf
, size
, type
, sha1
);
2040 ret
= hash_sha1_file(buf
, size
, type
, sha1
);
2046 int index_path(unsigned char *sha1
, const char *path
, struct stat
*st
, int write_object
)
2051 switch (st
->st_mode
& S_IFMT
) {
2053 fd
= open(path
, O_RDONLY
);
2055 return error("open(\"%s\"): %s", path
,
2057 if (index_fd(sha1
, fd
, st
, write_object
, NULL
) < 0)
2058 return error("%s: failed to insert into database",
2062 target
= xmalloc(st
->st_size
+1);
2063 if (readlink(path
, target
, st
->st_size
+1) != st
->st_size
) {
2064 char *errstr
= strerror(errno
);
2066 return error("readlink(\"%s\"): %s", path
,
2070 hash_sha1_file(target
, st
->st_size
, blob_type
, sha1
);
2071 else if (write_sha1_file(target
, st
->st_size
, blob_type
, sha1
))
2072 return error("%s: failed to insert into database",
2077 return error("%s: unsupported file type", path
);
2082 int read_pack_header(int fd
, struct pack_header
*header
)
2084 char *c
= (char*)header
;
2085 ssize_t remaining
= sizeof(struct pack_header
);
2087 ssize_t r
= xread(fd
, c
, remaining
);
2089 /* "eof before pack header was fully read" */
2090 return PH_ERROR_EOF
;
2093 } while (remaining
> 0);
2094 if (header
->hdr_signature
!= htonl(PACK_SIGNATURE
))
2095 /* "protocol error (pack signature mismatch detected)" */
2096 return PH_ERROR_PACK_SIGNATURE
;
2097 if (!pack_version_ok(header
->hdr_version
))
2098 /* "protocol error (pack version unsupported)" */
2099 return PH_ERROR_PROTOCOL
;