2 * GIT - The information manager from hell
4 * Copyright (C) Linus Torvalds, 2005
6 * This handles basic git sha1 object files - packing, unpacking,
15 #if defined(__linux__) && (defined(__i386__) || defined(__PPC__))
16 #define O_NOATIME 01000000
22 static unsigned int sha1_file_open_flag
= O_NOATIME
;
24 static unsigned hexval(char c
)
26 if (c
>= '0' && c
<= '9')
28 if (c
>= 'a' && c
<= 'f')
30 if (c
>= 'A' && c
<= 'F')
35 int get_sha1_hex(const char *hex
, unsigned char *sha1
)
38 for (i
= 0; i
< 20; i
++) {
39 unsigned int val
= (hexval(hex
[0]) << 4) | hexval(hex
[1]);
48 static int get_sha1_file(const char *path
, unsigned char *result
)
51 int fd
= open(path
, O_RDONLY
);
56 len
= read(fd
, buffer
, sizeof(buffer
));
60 return get_sha1_hex(buffer
, result
);
63 static char *git_dir
, *git_object_dir
, *git_index_file
, *git_refs_dir
;
64 static void setup_git_env(void)
66 git_dir
= gitenv(GIT_DIR_ENVIRONMENT
);
68 git_dir
= DEFAULT_GIT_DIR_ENVIRONMENT
;
69 git_object_dir
= gitenv(DB_ENVIRONMENT
);
70 if (!git_object_dir
) {
71 git_object_dir
= xmalloc(strlen(git_dir
) + 9);
72 sprintf(git_object_dir
, "%s/objects", git_dir
);
74 git_refs_dir
= xmalloc(strlen(git_dir
) + 6);
75 sprintf(git_refs_dir
, "%s/refs", git_dir
);
76 git_index_file
= gitenv(INDEX_ENVIRONMENT
);
77 if (!git_index_file
) {
78 git_index_file
= xmalloc(strlen(git_dir
) + 7);
79 sprintf(git_index_file
, "%s/index", git_dir
);
83 char *get_object_directory(void)
87 return git_object_dir
;
90 char *get_refs_directory(void)
97 char *get_index_file(void)
101 return git_index_file
;
104 int get_sha1(const char *str
, unsigned char *sha1
)
106 static char pathname
[PATH_MAX
];
107 static const char *prefix
[] = {
117 if (!get_sha1_hex(str
, sha1
))
122 for (p
= prefix
; *p
; p
++) {
123 snprintf(pathname
, sizeof(pathname
), "%s/%s/%s",
125 if (!get_sha1_file(pathname
, sha1
))
132 char * sha1_to_hex(const unsigned char *sha1
)
134 static char buffer
[50];
135 static const char hex
[] = "0123456789abcdef";
139 for (i
= 0; i
< 20; i
++) {
140 unsigned int val
= *sha1
++;
141 *buf
++ = hex
[val
>> 4];
142 *buf
++ = hex
[val
& 0xf];
147 static void fill_sha1_path(char *pathbuf
, const unsigned char *sha1
)
150 for (i
= 0; i
< 20; i
++) {
151 static char hex
[] = "0123456789abcdef";
152 unsigned int val
= sha1
[i
];
153 char *pos
= pathbuf
+ i
*2 + (i
> 0);
154 *pos
++ = hex
[val
>> 4];
155 *pos
= hex
[val
& 0xf];
160 * NOTE! This returns a statically allocated buffer, so you have to be
161 * careful about using it. Do a "strdup()" if you need to save the
164 * Also note that this returns the location for creating. Reading
165 * SHA1 file can happen from any alternate directory listed in the
166 * DB_ENVIRONMENT environment variable if it is not found in
167 * the primary object database.
169 char *sha1_file_name(const unsigned char *sha1
)
171 static char *name
, *base
;
174 const char *sha1_file_directory
= get_object_directory();
175 int len
= strlen(sha1_file_directory
);
176 base
= xmalloc(len
+ 60);
177 memcpy(base
, sha1_file_directory
, len
);
178 memset(base
+len
, 0, 60);
181 name
= base
+ len
+ 1;
183 fill_sha1_path(name
, sha1
);
187 struct alternate_object_database
*alt_odb
;
190 * Prepare alternate object database registry.
191 * alt_odb points at an array of struct alternate_object_database.
192 * This array is terminated with an element that has both its base
193 * and name set to NULL. alt_odb[n] comes from n'th non-empty
194 * element from colon separated ALTERNATE_DB_ENVIRONMENT environment
195 * variable, and its base points at a statically allocated buffer
196 * that contains "/the/directory/corresponding/to/.git/objects/...",
197 * while its name points just after the slash at the end of
198 * ".git/objects/" in the example above, and has enough space to hold
199 * 40-byte hex SHA1, an extra slash for the first level indirection,
200 * and the terminating NUL.
201 * This function allocates the alt_odb array and all the strings
202 * pointed by base fields of the array elements with one xmalloc();
203 * the string pool immediately follows the array.
205 void prepare_alt_odb(void)
208 const char *cp
, *last
;
210 const char *alt
= gitenv(ALTERNATE_DB_ENVIRONMENT
) ? : "";
214 /* The first pass counts how large an area to allocate to
215 * hold the entire alt_odb structure, including array of
216 * structs and path buffers for them. The second pass fills
217 * the structure and prepares the path buffers for use by
220 for (totlen
= pass
= 0; pass
< 2; pass
++) {
224 cp
= strchr(last
, ':') ? : last
+ strlen(last
);
226 /* 43 = 40-byte + 2 '/' + terminating NUL */
227 int pfxlen
= cp
- last
;
228 int entlen
= pfxlen
+ 43;
232 alt_odb
[i
].base
= op
;
233 alt_odb
[i
].name
= op
+ pfxlen
+ 1;
234 memcpy(op
, last
, pfxlen
);
235 op
[pfxlen
] = op
[pfxlen
+ 3] = '/';
241 while (*cp
&& *cp
== ':')
247 alt_odb
= xmalloc(sizeof(*alt_odb
) * (i
+ 1) + totlen
);
248 alt_odb
[i
].base
= alt_odb
[i
].name
= NULL
;
249 op
= (char*)(&alt_odb
[i
+1]);
253 static char *find_sha1_file(const unsigned char *sha1
, struct stat
*st
)
256 char *name
= sha1_file_name(sha1
);
261 for (i
= 0; (name
= alt_odb
[i
].name
) != NULL
; i
++) {
262 fill_sha1_path(name
, sha1
);
263 if (!stat(alt_odb
[i
].base
, st
))
264 return alt_odb
[i
].base
;
269 #define PACK_MAX_SZ (1<<26)
270 static int pack_used_ctr
;
271 static unsigned long pack_mapped
;
272 struct packed_git
*packed_git
;
276 unsigned char sha1
[20];
277 struct packed_git
*p
;
280 static int check_packed_git_idx(const char *path
, unsigned long *idx_size_
,
285 unsigned long idx_size
;
287 int fd
= open(path
, O_RDONLY
);
291 if (fstat(fd
, &st
)) {
295 idx_size
= st
.st_size
;
296 idx_map
= mmap(NULL
, idx_size
, PROT_READ
, MAP_PRIVATE
, fd
, 0);
298 if (idx_map
== MAP_FAILED
)
303 /* check index map */
304 if (idx_size
< 4*256 + 20)
305 return error("index file too small");
307 for (i
= 0; i
< 256; i
++) {
308 unsigned int n
= ntohl(index
[i
]);
310 return error("non-monotonic index");
316 * - 256 index entries 4 bytes each
317 * - 24-byte entries * nr (20-byte sha1 + 4-byte offset)
318 * - 20-byte SHA1 of the packfile
319 * - 20-byte SHA1 file checksum
321 if (idx_size
!= 4*256 + nr
* 24 + 20 + 20)
322 return error("wrong index file size");
325 *idx_size_
= idx_size
;
329 static void unuse_one_packed_git(void)
334 static int use_packed_git(struct packed_git
*p
)
341 pack_mapped
+= p
->pack_size
;
342 while (PACK_MAX_SZ
< pack_mapped
)
343 unuse_one_packed_git();
344 fd
= open(p
->pack_name
, O_RDONLY
);
347 if (fstat(fd
, &st
)) {
351 if (st
.st_size
!= p
->pack_size
)
353 map
= mmap(NULL
, p
->pack_size
, PROT_READ
, MAP_PRIVATE
, fd
, 0);
355 if (map
== MAP_FAILED
)
359 p
->pack_last_used
= pack_used_ctr
++;
363 static struct packed_git
*add_packed_git(char *path
, int path_len
)
366 struct packed_git
*p
;
367 unsigned long idx_size
;
370 if (check_packed_git_idx(path
, &idx_size
, &idx_map
))
373 /* do we have a corresponding .pack file? */
374 strcpy(path
+ path_len
- 4, ".pack");
375 if (stat(path
, &st
) || !S_ISREG(st
.st_mode
)) {
376 munmap(idx_map
, idx_size
);
379 /* ok, it looks sane as far as we can check without
380 * actually mapping the pack file.
382 p
= xmalloc(sizeof(*p
) + path_len
+ 2);
383 strcpy(p
->pack_name
, path
);
384 p
->index_size
= idx_size
;
385 p
->pack_size
= st
.st_size
;
386 p
->index_base
= idx_map
;
388 p
->pack_last_used
= 0;
392 static void prepare_packed_git_one(char *objdir
)
399 sprintf(path
, "%s/pack", objdir
);
405 while ((de
= readdir(dir
)) != NULL
) {
406 int namelen
= strlen(de
->d_name
);
407 struct packed_git
*p
;
409 if (strcmp(de
->d_name
+ namelen
- 4, ".idx"))
412 /* we have .idx. Is it a file we can map? */
413 strcpy(path
+ len
, de
->d_name
);
414 p
= add_packed_git(path
, len
+ namelen
);
417 p
->next
= packed_git
;
422 void prepare_packed_git(void)
425 static int run_once
= 0;
430 prepare_packed_git_one(get_object_directory());
432 for (i
= 0; alt_odb
[i
].base
!= NULL
; i
++) {
433 alt_odb
[i
].name
[0] = 0;
434 prepare_packed_git_one(alt_odb
[i
].base
);
438 int check_sha1_signature(const unsigned char *sha1
, void *map
, unsigned long size
, const char *type
)
441 unsigned char real_sha1
[20];
445 SHA1_Update(&c
, header
, 1+sprintf(header
, "%s %lu", type
, size
));
446 SHA1_Update(&c
, map
, size
);
447 SHA1_Final(real_sha1
, &c
);
448 return memcmp(sha1
, real_sha1
, 20) ? -1 : 0;
451 static void *map_sha1_file_internal(const unsigned char *sha1
,
458 char *filename
= find_sha1_file(sha1
, &st
);
462 error("cannot map sha1 file %s", sha1_to_hex(sha1
));
466 fd
= open(filename
, O_RDONLY
| sha1_file_open_flag
);
468 /* See if it works without O_NOATIME */
469 switch (sha1_file_open_flag
) {
471 fd
= open(filename
, O_RDONLY
);
481 /* If it failed once, it will probably fail again.
482 * Stop using O_NOATIME
484 sha1_file_open_flag
= 0;
486 map
= mmap(NULL
, st
.st_size
, PROT_READ
, MAP_PRIVATE
, fd
, 0);
488 if (-1 == (int)(long)map
)
494 void *map_sha1_file(const unsigned char *sha1
, unsigned long *size
)
496 return map_sha1_file_internal(sha1
, size
, 1);
499 int unpack_sha1_header(z_stream
*stream
, void *map
, unsigned long mapsize
, void *buffer
, unsigned long size
)
501 /* Get the data stream */
502 memset(stream
, 0, sizeof(*stream
));
503 stream
->next_in
= map
;
504 stream
->avail_in
= mapsize
;
505 stream
->next_out
= buffer
;
506 stream
->avail_out
= size
;
509 return inflate(stream
, 0);
512 void *unpack_sha1_rest(z_stream
*stream
, void *buffer
, unsigned long size
)
514 int bytes
= strlen(buffer
) + 1;
515 unsigned char *buf
= xmalloc(1+size
);
517 memcpy(buf
, buffer
+ bytes
, stream
->total_out
- bytes
);
518 bytes
= stream
->total_out
- bytes
;
520 stream
->next_out
= buf
+ bytes
;
521 stream
->avail_out
= size
- bytes
;
522 while (inflate(stream
, Z_FINISH
) == Z_OK
)
531 * We used to just use "sscanf()", but that's actually way
532 * too permissive for what we want to check. So do an anal
533 * object header parse by hand.
535 int parse_sha1_header(char *hdr
, char *type
, unsigned long *sizep
)
541 * The type can be at most ten bytes (including the
542 * terminating '\0' that we add), and is followed by
557 * The length must follow immediately, and be in canonical
558 * decimal format (ie "010" is not valid).
565 unsigned long c
= *hdr
- '0';
569 size
= size
* 10 + c
;
575 * The length must be followed by a zero byte
577 return *hdr
? -1 : 0;
580 void * unpack_sha1_file(void *map
, unsigned long mapsize
, char *type
, unsigned long *size
)
586 ret
= unpack_sha1_header(&stream
, map
, mapsize
, hdr
, sizeof(hdr
));
587 if (ret
< Z_OK
|| parse_sha1_header(hdr
, type
, size
) < 0)
590 return unpack_sha1_rest(&stream
, hdr
, *size
);
593 static int packed_delta_info(unsigned char *base_sha1
,
594 unsigned long delta_size
,
597 unsigned long *sizep
)
600 unsigned char delta_head
[64];
603 unsigned long data_size
, result_size
, base_size
, verify_base_size
;
608 die("truncated pack file");
609 if (sha1_object_info(base_sha1
, type
, &base_size
))
610 die("cannot get info for delta-pack base");
612 data
= base_sha1
+ 20;
613 data_size
= left
- 20;
615 memset(&stream
, 0, sizeof(stream
));
617 stream
.next_in
= data
;
618 stream
.avail_in
= data_size
;
619 stream
.next_out
= delta_head
;
620 stream
.avail_out
= sizeof(delta_head
);
622 inflateInit(&stream
);
623 st
= inflate(&stream
, Z_FINISH
);
625 if ((st
!= Z_STREAM_END
) && stream
.total_out
!= sizeof(delta_head
))
626 die("delta data unpack-initial failed");
628 /* Examine the initial part of the delta to figure out
629 * the result size. Verify the base size while we are at it.
632 verify_base_size
= i
= 0;
636 verify_base_size
|= *data
++ << i
;
641 /* Read the result size */
646 result_size
|= *data
++ << i
;
650 if (verify_base_size
!= base_size
)
651 die("delta base size mismatch");
653 *sizep
= result_size
;
657 static int packed_object_info(struct pack_entry
*entry
,
658 char *type
, unsigned long *sizep
)
660 struct packed_git
*p
= entry
->p
;
661 unsigned long offset
, size
, left
;
664 offset
= entry
->offset
;
665 if (p
->pack_size
- 5 < offset
)
666 die("object offset outside of pack file");
668 if (use_packed_git(p
))
669 die("cannot map packed file");
671 pack
= p
->pack_base
+ offset
;
672 size
= (pack
[1] << 24) + (pack
[2] << 16) + (pack
[3] << 8) + pack
[4];
673 left
= p
->pack_size
- offset
- 5;
676 return packed_delta_info(pack
+5, size
, left
, type
, sizep
);
679 strcpy(type
, "commit");
682 strcpy(type
, "tree");
685 strcpy(type
, "blob");
691 die("corrupted pack file");
697 /* forward declaration for a mutually recursive function */
698 static void *unpack_entry(struct pack_entry
*, char *, unsigned long *);
700 static void *unpack_delta_entry(unsigned char *base_sha1
,
701 unsigned long delta_size
,
704 unsigned long *sizep
)
706 void *data
, *delta_data
, *result
, *base
;
707 unsigned long data_size
, result_size
, base_size
;
712 die("truncated pack file");
713 data
= base_sha1
+ 20;
714 data_size
= left
- 20;
715 delta_data
= xmalloc(delta_size
);
717 memset(&stream
, 0, sizeof(stream
));
719 stream
.next_in
= data
;
720 stream
.avail_in
= data_size
;
721 stream
.next_out
= delta_data
;
722 stream
.avail_out
= delta_size
;
724 inflateInit(&stream
);
725 st
= inflate(&stream
, Z_FINISH
);
727 if ((st
!= Z_STREAM_END
) || stream
.total_out
!= delta_size
)
728 die("delta data unpack failed");
730 /* This may recursively unpack the base, which is what we want */
731 base
= read_sha1_file(base_sha1
, type
, &base_size
);
733 die("failed to read delta-pack base object %s",
734 sha1_to_hex(base_sha1
));
735 result
= patch_delta(base
, base_size
,
736 delta_data
, delta_size
,
739 die("failed to apply delta");
742 *sizep
= result_size
;
746 static void *unpack_non_delta_entry(unsigned char *data
,
754 buffer
= xmalloc(size
+ 1);
756 memset(&stream
, 0, sizeof(stream
));
757 stream
.next_in
= data
;
758 stream
.avail_in
= left
;
759 stream
.next_out
= buffer
;
760 stream
.avail_out
= size
;
762 inflateInit(&stream
);
763 st
= inflate(&stream
, Z_FINISH
);
765 if ((st
!= Z_STREAM_END
) || stream
.total_out
!= size
) {
773 static void *unpack_entry(struct pack_entry
*entry
,
774 char *type
, unsigned long *sizep
)
776 struct packed_git
*p
= entry
->p
;
777 unsigned long offset
, size
, left
;
780 offset
= entry
->offset
;
781 if (p
->pack_size
- 5 < offset
)
782 die("object offset outside of pack file");
784 if (use_packed_git(p
))
785 die("cannot map packed file");
787 pack
= p
->pack_base
+ offset
;
788 size
= (pack
[1] << 24) + (pack
[2] << 16) + (pack
[3] << 8) + pack
[4];
789 left
= p
->pack_size
- offset
- 5;
792 return unpack_delta_entry(pack
+5, size
, left
, type
, sizep
);
794 strcpy(type
, "commit");
797 strcpy(type
, "tree");
800 strcpy(type
, "blob");
806 die("corrupted pack file");
809 return unpack_non_delta_entry(pack
+5, size
, left
);
812 int num_packed_objects(const struct packed_git
*p
)
814 /* See check_packed_git_idx and pack-objects.c */
815 return (p
->index_size
- 20 - 20 - 4*256) / 24;
818 int nth_packed_object_sha1(const struct packed_git
*p
, int n
,
821 void *index
= p
->index_base
+ 256;
822 if (n
< 0 || num_packed_objects(p
) <= n
)
824 memcpy(sha1
, (index
+ 24 * n
+ 4), 20);
828 static int find_pack_entry_1(const unsigned char *sha1
,
829 struct pack_entry
*e
, struct packed_git
*p
)
831 int *level1_ofs
= p
->index_base
;
832 int hi
= ntohl(level1_ofs
[*sha1
]);
833 int lo
= ((*sha1
== 0x0) ? 0 : ntohl(level1_ofs
[*sha1
- 1]));
834 void *index
= p
->index_base
+ 256;
837 int mi
= (lo
+ hi
) / 2;
838 int cmp
= memcmp(index
+ 24 * mi
+ 4, sha1
, 20);
840 e
->offset
= ntohl(*((int*)(index
+ 24 * mi
)));
841 memcpy(e
->sha1
, sha1
, 20);
853 static int find_pack_entry(const unsigned char *sha1
, struct pack_entry
*e
)
855 struct packed_git
*p
;
856 prepare_packed_git();
858 for (p
= packed_git
; p
; p
= p
->next
) {
859 if (find_pack_entry_1(sha1
, e
, p
))
865 int sha1_object_info(const unsigned char *sha1
, char *type
, unsigned long *sizep
)
868 unsigned long mapsize
, size
;
873 map
= map_sha1_file_internal(sha1
, &mapsize
, 0);
877 if (!find_pack_entry(sha1
, &e
))
878 return error("unable to find %s", sha1_to_hex(sha1
));
879 if (!packed_object_info(&e
, type
, sizep
))
882 map
= unpack_entry(&e
, type
, sizep
);
884 return (map
== NULL
) ? 0 : -1;
886 if (unpack_sha1_header(&stream
, map
, mapsize
, hdr
, sizeof(hdr
)) < 0)
887 status
= error("unable to unpack %s header",
889 if (parse_sha1_header(hdr
, type
, &size
) < 0)
890 status
= error("unable to parse %s header", sha1_to_hex(sha1
));
896 munmap(map
, mapsize
);
900 static void *read_packed_sha1(const unsigned char *sha1
, char *type
, unsigned long *size
)
904 if (!find_pack_entry(sha1
, &e
)) {
905 error("cannot read sha1_file for %s", sha1_to_hex(sha1
));
908 return unpack_entry(&e
, type
, size
);
911 void * read_sha1_file(const unsigned char *sha1
, char *type
, unsigned long *size
)
913 unsigned long mapsize
;
916 map
= map_sha1_file_internal(sha1
, &mapsize
, 0);
918 buf
= unpack_sha1_file(map
, mapsize
, type
, size
);
919 munmap(map
, mapsize
);
922 return read_packed_sha1(sha1
, type
, size
);
925 void *read_object_with_reference(const unsigned char *sha1
,
926 const char *required_type
,
928 unsigned char *actual_sha1_return
)
933 unsigned char actual_sha1
[20];
935 memcpy(actual_sha1
, sha1
, 20);
938 const char *ref_type
= NULL
;
940 buffer
= read_sha1_file(actual_sha1
, type
, &isize
);
943 if (!strcmp(type
, required_type
)) {
945 if (actual_sha1_return
)
946 memcpy(actual_sha1_return
, actual_sha1
, 20);
949 /* Handle references */
950 else if (!strcmp(type
, "commit"))
952 else if (!strcmp(type
, "tag"))
953 ref_type
= "object ";
958 ref_length
= strlen(ref_type
);
960 if (memcmp(buffer
, ref_type
, ref_length
) ||
961 get_sha1_hex(buffer
+ ref_length
, actual_sha1
)) {
965 /* Now we have the ID of the referred-to object in
966 * actual_sha1. Check again. */
970 static char *write_sha1_file_prepare(void *buf
,
979 /* Generate the header */
980 *hdrlen
= sprintf((char *)hdr
, "%s %lu", type
, len
)+1;
984 SHA1_Update(&c
, hdr
, *hdrlen
);
985 SHA1_Update(&c
, buf
, len
);
986 SHA1_Final(sha1
, &c
);
988 return sha1_file_name(sha1
);
991 int write_sha1_file(void *buf
, unsigned long len
, const char *type
, unsigned char *returnsha1
)
994 unsigned char *compressed
;
996 unsigned char sha1
[20];
998 static char tmpfile
[PATH_MAX
];
999 unsigned char hdr
[50];
1000 int fd
, hdrlen
, ret
;
1002 /* Normally if we have it in the pack then we do not bother writing
1003 * it out into .git/objects/??/?{38} file.
1005 filename
= write_sha1_file_prepare(buf
, len
, type
, sha1
, hdr
, &hdrlen
);
1007 memcpy(returnsha1
, sha1
, 20);
1008 if (has_sha1_file(sha1
))
1010 fd
= open(filename
, O_RDONLY
);
1013 * FIXME!!! We might do collision checking here, but we'd
1014 * need to uncompress the old file and check it. Later.
1020 if (errno
!= ENOENT
) {
1021 fprintf(stderr
, "sha1 file %s: %s", filename
, strerror(errno
));
1025 snprintf(tmpfile
, sizeof(tmpfile
), "%s/obj_XXXXXX", get_object_directory());
1027 fd
= mkstemp(tmpfile
);
1029 fprintf(stderr
, "unable to create temporary sha1 filename %s: %s", tmpfile
, strerror(errno
));
1034 memset(&stream
, 0, sizeof(stream
));
1035 deflateInit(&stream
, Z_BEST_COMPRESSION
);
1036 size
= deflateBound(&stream
, len
+hdrlen
);
1037 compressed
= xmalloc(size
);
1040 stream
.next_out
= compressed
;
1041 stream
.avail_out
= size
;
1043 /* First header.. */
1044 stream
.next_in
= hdr
;
1045 stream
.avail_in
= hdrlen
;
1046 while (deflate(&stream
, 0) == Z_OK
)
1049 /* Then the data itself.. */
1050 stream
.next_in
= buf
;
1051 stream
.avail_in
= len
;
1052 while (deflate(&stream
, Z_FINISH
) == Z_OK
)
1054 deflateEnd(&stream
);
1055 size
= stream
.total_out
;
1057 if (write(fd
, compressed
, size
) != size
)
1058 die("unable to write file");
1063 ret
= link(tmpfile
, filename
);
1068 * Coda hack - coda doesn't like cross-directory links,
1069 * so we fall back to a rename, which will mean that it
1070 * won't be able to check collisions, but that's not a
1073 * When this succeeds, we just return 0. We have nothing
1076 if (ret
== EXDEV
&& !rename(tmpfile
, filename
))
1081 if (ret
!= EEXIST
) {
1082 fprintf(stderr
, "unable to write sha1 filename %s: %s", filename
, strerror(ret
));
1085 /* FIXME!!! Collision check here ? */
1091 int write_sha1_from_fd(const unsigned char *sha1
, int fd
)
1093 char *filename
= sha1_file_name(sha1
);
1097 unsigned char real_sha1
[20];
1098 unsigned char buf
[4096];
1099 unsigned char discard
[4096];
1103 local
= open(filename
, O_WRONLY
| O_CREAT
| O_EXCL
, 0666);
1106 return error("Couldn't open %s\n", filename
);
1108 memset(&stream
, 0, sizeof(stream
));
1110 inflateInit(&stream
);
1116 size
= read(fd
, buf
, 4096);
1121 return error("Connection closed?");
1122 perror("Reading from connection");
1125 write(local
, buf
, size
);
1126 stream
.avail_in
= size
;
1127 stream
.next_in
= buf
;
1129 stream
.next_out
= discard
;
1130 stream
.avail_out
= sizeof(discard
);
1131 ret
= inflate(&stream
, Z_SYNC_FLUSH
);
1132 SHA1_Update(&c
, discard
, sizeof(discard
) -
1134 } while (stream
.avail_in
&& ret
== Z_OK
);
1136 } while (ret
== Z_OK
);
1137 inflateEnd(&stream
);
1140 SHA1_Final(real_sha1
, &c
);
1141 if (ret
!= Z_STREAM_END
) {
1143 return error("File %s corrupted", sha1_to_hex(sha1
));
1145 if (memcmp(sha1
, real_sha1
, 20)) {
1147 return error("File %s has bad hash\n", sha1_to_hex(sha1
));
1153 int has_sha1_file(const unsigned char *sha1
)
1156 struct pack_entry e
;
1158 if (find_sha1_file(sha1
, &st
))
1160 return find_pack_entry(sha1
, &e
);
1163 int index_fd(unsigned char *sha1
, int fd
, struct stat
*st
)
1165 unsigned long size
= st
->st_size
;
1171 buf
= mmap(NULL
, size
, PROT_READ
, MAP_PRIVATE
, fd
, 0);
1173 if ((int)(long)buf
== -1)
1176 ret
= write_sha1_file(buf
, size
, "blob", sha1
);