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 struct packed_git *packed_git;
415 "pack_report: getpagesize() = %10" SZ_FMT "\n"
416 "pack_report: core.packedGitWindowSize = %10" SZ_FMT "\n"
417 "pack_report: core.packedGitLimit = %10" SZ_FMT "\n",
418 (size_t) getpagesize(),
419 packed_git_window_size,
422 "pack_report: pack_used_ctr = %10u\n"
423 "pack_report: pack_mmap_calls = %10u\n"
424 "pack_report: pack_open_windows = %10u / %10u\n"
425 "pack_report: pack_mapped = "
426 "%10" SZ_FMT " / %10" SZ_FMT "\n",
429 pack_open_windows, peak_pack_open_windows,
430 pack_mapped, peak_pack_mapped);
433 static int check_packed_git_idx(const char *path,
434 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 if (idx_size < 4 * 256 + 20 + 20) {
452 return error("index file %s is too small", path);
454 idx_map = xmmap(NULL, idx_size, PROT_READ, MAP_PRIVATE, fd, 0);
459 *idx_size_ = idx_size;
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 munmap(idx_map, idx_size);
467 return error("index file %s is a newer version"
468 " and is not supported by this binary"
469 " (try upgrading GIT to a newer version)",
474 for (i = 0; i < 256; i++) {
475 uint32_t n = ntohl(index[i]);
477 munmap(idx_map, idx_size);
478 return error("non-monotonic index %s", path);
485 * - 256 index entries 4 bytes each
486 * - 24-byte entries * nr (20-byte sha1 + 4-byte offset)
487 * - 20-byte SHA1 of the packfile
488 * - 20-byte SHA1 file checksum
490 if (idx_size != 4*256 + nr * 24 + 20 + 20) {
491 munmap(idx_map, idx_size);
492 return error("wrong index file size in %s", path);
498 static void scan_windows(struct packed_git *p,
499 struct packed_git **lru_p,
500 struct pack_window **lru_w,
501 struct pack_window **lru_l)
503 struct pack_window *w, *w_l;
505 for (w_l = NULL, w = p->windows; w; w = w->next) {
507 if (!*lru_w || w->last_used < (*lru_w)->last_used) {
517 static int unuse_one_window(struct packed_git *current)
519 struct packed_git *p, *lru_p = NULL;
520 struct pack_window *lru_w = NULL, *lru_l = NULL;
523 scan_windows(current, &lru_p, &lru_w, &lru_l);
524 for (p = packed_git; p; p = p->next)
525 scan_windows(p, &lru_p, &lru_w, &lru_l);
527 munmap(lru_w->base, lru_w->len);
528 pack_mapped -= lru_w->len;
530 lru_l->next = lru_w->next;
532 lru_p->windows = lru_w->next;
533 if (!lru_p->windows && lru_p != current) {
534 close(lru_p->pack_fd);
545 void release_pack_memory(size_t need)
547 size_t cur = pack_mapped;
548 while (need >= (cur - pack_mapped) && unuse_one_window(NULL))
552 void unuse_pack(struct pack_window **w_cursor)
554 struct pack_window *w = *w_cursor;
562 * Do not call this directly as this leaks p->pack_fd on error return;
563 * call open_packed_git() instead.
565 static int open_packed_git_1(struct packed_git *p)
568 struct pack_header hdr;
569 unsigned char sha1[20];
570 unsigned char *idx_sha1;
573 p->pack_fd = open(p->pack_name, O_RDONLY);
574 if (p->pack_fd < 0 || fstat(p->pack_fd, &st))
577 /* If we created the struct before we had the pack we lack size. */
579 if (!S_ISREG(st.st_mode))
580 return error("packfile %s not a regular file", p->pack_name);
581 p->pack_size = st.st_size;
582 } else if (p->pack_size != st.st_size)
583 return error("packfile %s size changed", p->pack_name);
585 /* We leave these file descriptors open with sliding mmap;
586 * there is no point keeping them open across exec(), though.
588 fd_flag = fcntl(p->pack_fd, F_GETFD, 0);
590 return error("cannot determine file descriptor flags");
591 fd_flag |= FD_CLOEXEC;
592 if (fcntl(p->pack_fd, F_SETFD, fd_flag) == -1)
593 return error("cannot set FD_CLOEXEC");
595 /* Verify we recognize this pack file format. */
596 if (read_in_full(p->pack_fd, &hdr, sizeof(hdr)) != sizeof(hdr))
597 return error("file %s is far too short to be a packfile", p->pack_name);
598 if (hdr.hdr_signature != htonl(PACK_SIGNATURE))
599 return error("file %s is not a GIT packfile", p->pack_name);
600 if (!pack_version_ok(hdr.hdr_version))
601 return error("packfile %s is version %u and not supported"
602 " (try upgrading GIT to a newer version)",
603 p->pack_name, ntohl(hdr.hdr_version));
605 /* Verify the pack matches its index. */
606 if (num_packed_objects(p) != ntohl(hdr.hdr_entries))
607 return error("packfile %s claims to have %u objects"
608 " while index size indicates %u objects",
609 p->pack_name, ntohl(hdr.hdr_entries),
610 num_packed_objects(p));
611 if (lseek(p->pack_fd, p->pack_size - sizeof(sha1), SEEK_SET) == -1)
612 return error("end of packfile %s is unavailable", p->pack_name);
613 if (read_in_full(p->pack_fd, sha1, sizeof(sha1)) != sizeof(sha1))
614 return error("packfile %s signature is unavailable", p->pack_name);
615 idx_sha1 = ((unsigned char *)p->index_base) + p->index_size - 40;
616 if (hashcmp(sha1, idx_sha1))
617 return error("packfile %s does not match index", p->pack_name);
621 static int open_packed_git(struct packed_git *p)
623 if (!open_packed_git_1(p))
625 if (p->pack_fd != -1) {
632 static int in_window(struct pack_window *win, unsigned long offset)
634 /* We must promise at least 20 bytes (one hash) after the
635 * offset is available from this window, otherwise the offset
636 * is not actually in this window and a different window (which
637 * has that one hash excess) must be used. This is to support
638 * the object header and delta base parsing routines below.
640 off_t win_off = win->offset;
641 return win_off <= offset
642 && (offset + 20) <= (win_off + win->len);
645 unsigned char* use_pack(struct packed_git *p,
646 struct pack_window **w_cursor,
647 unsigned long offset,
650 struct pack_window *win = *w_cursor;
652 if (p->pack_fd == -1 && open_packed_git(p))
653 die("packfile %s cannot be accessed", p->pack_name);
655 /* Since packfiles end in a hash of their content and its
656 * pointless to ask for an offset into the middle of that
657 * hash, and the in_window function above wouldn't match
658 * don't allow an offset too close to the end of the file.
660 if (offset > (p->pack_size - 20))
661 die("offset beyond end of packfile (truncated pack?)");
663 if (!win || !in_window(win, offset)) {
666 for (win = p->windows; win; win = win->next) {
667 if (in_window(win, offset))
671 size_t window_align = packed_git_window_size / 2;
672 win = xcalloc(1, sizeof(*win));
673 win->offset = (offset / window_align) * window_align;
674 win->len = p->pack_size - win->offset;
675 if (win->len > packed_git_window_size)
676 win->len = packed_git_window_size;
677 pack_mapped += win->len;
678 while (packed_git_limit < pack_mapped
679 && unuse_one_window(p))
681 win->base = xmmap(NULL, win->len,
682 PROT_READ, MAP_PRIVATE,
683 p->pack_fd, win->offset);
684 if (win->base == MAP_FAILED)
685 die("packfile %s cannot be mapped: %s",
690 if (pack_mapped > peak_pack_mapped)
691 peak_pack_mapped = pack_mapped;
692 if (pack_open_windows > peak_pack_open_windows)
693 peak_pack_open_windows = pack_open_windows;
694 win->next = p->windows;
698 if (win != *w_cursor) {
699 win->last_used = pack_used_ctr++;
703 offset -= win->offset;
705 *left = win->len - offset;
706 return win->base + offset;
709 struct packed_git *add_packed_git(char *path, int path_len, int local)
712 struct packed_git *p;
713 unsigned long idx_size;
715 unsigned char sha1[20];
717 if (check_packed_git_idx(path, &idx_size, &idx_map))
720 /* do we have a corresponding .pack file? */
721 strcpy(path + path_len - 4, ".pack");
722 if (stat(path, &st) || !S_ISREG(st.st_mode)) {
723 munmap(idx_map, idx_size);
726 /* ok, it looks sane as far as we can check without
727 * actually mapping the pack file.
729 p = xmalloc(sizeof(*p) + path_len + 2);
730 strcpy(p->pack_name, path);
731 p->index_size = idx_size;
732 p->pack_size = st.st_size;
733 p->index_base = idx_map;
737 p->pack_local = local;
738 if ((path_len > 44) && !get_sha1_hex(path + path_len - 44, sha1))
739 hashcpy(p->sha1, sha1);
743 struct packed_git *parse_pack_index(unsigned char *sha1)
745 char *path = sha1_pack_index_name(sha1);
746 return parse_pack_index_file(sha1, path);
749 struct packed_git *parse_pack_index_file(const unsigned char *sha1, char *idx_path)
751 struct packed_git *p;
752 unsigned long idx_size;
756 if (check_packed_git_idx(idx_path, &idx_size, &idx_map))
759 path = sha1_pack_name(sha1);
761 p = xmalloc(sizeof(*p) + strlen(path) + 2);
762 strcpy(p->pack_name, path);
763 p->index_size = idx_size;
765 p->index_base = idx_map;
769 hashcpy(p->sha1, sha1);
773 void install_packed_git(struct packed_git *pack)
775 pack->next = packed_git;
779 static void prepare_packed_git_one(char *objdir, int local)
786 sprintf(path, "%s/pack", objdir);
791 error("unable to open object pack directory: %s: %s",
792 path, strerror(errno));
796 while ((de = readdir(dir)) != NULL) {
797 int namelen = strlen(de->d_name);
798 struct packed_git *p;
800 if (!has_extension(de->d_name, ".idx"))
803 /* Don't reopen a pack we already have. */
804 strcpy(path + len, de->d_name);
805 for (p = packed_git; p; p = p->next) {
806 if (!memcmp(path, p->pack_name, len + namelen - 4))
811 /* See if it really is a valid .idx file with corresponding
812 * .pack file that we can map.
814 p = add_packed_git(path, len + namelen, local);
817 install_packed_git(p);
822 static int prepare_packed_git_run_once = 0;
823 void prepare_packed_git(void)
825 struct alternate_object_database *alt;
827 if (prepare_packed_git_run_once)
829 prepare_packed_git_one(get_object_directory(), 1);
831 for (alt = alt_odb_list; alt; alt = alt->next) {
833 prepare_packed_git_one(alt->base, 0);
836 prepare_packed_git_run_once = 1;
839 void reprepare_packed_git(void)
841 prepare_packed_git_run_once = 0;
842 prepare_packed_git();
845 int check_sha1_signature(const unsigned char *sha1, void *map, unsigned long size, const char *type)
847 unsigned char real_sha1[20];
848 hash_sha1_file(map, size, type, real_sha1);
849 return hashcmp(sha1, real_sha1) ? -1 : 0;
852 void *map_sha1_file(const unsigned char *sha1, unsigned long *size)
857 char *filename = find_sha1_file(sha1, &st);
863 fd = open(filename, O_RDONLY | sha1_file_open_flag);
865 /* See if it works without O_NOATIME */
866 switch (sha1_file_open_flag) {
868 fd = open(filename, O_RDONLY);
876 /* If it failed once, it will probably fail again.
877 * Stop using O_NOATIME
879 sha1_file_open_flag = 0;
881 map = xmmap(NULL, st.st_size, PROT_READ, MAP_PRIVATE, fd, 0);
887 int legacy_loose_object(unsigned char *map)
892 * Is it a zlib-compressed buffer? If so, the first byte
893 * must be 0x78 (15-bit window size, deflated), and the
894 * first 16-bit word is evenly divisible by 31
896 word = (map[0] << 8) + map[1];
897 if (map[0] == 0x78 && !(word % 31))
903 unsigned long unpack_object_header_gently(const unsigned char *buf, unsigned long len, enum object_type *type, unsigned long *sizep)
908 unsigned long used = 0;
911 *type = (c >> 4) & 7;
917 if (sizeof(long) * 8 <= shift)
920 size += (c & 0x7f) << shift;
927 static int unpack_sha1_header(z_stream *stream, unsigned char *map, unsigned long mapsize, void *buffer, unsigned long bufsiz)
929 unsigned long size, used;
930 static const char valid_loose_object_type[8] = {
932 1, 1, 1, 1, /* "commit", "tree", "blob", "tag" */
933 0, /* "delta" and others are invalid in a loose object */
935 enum object_type type;
937 /* Get the data stream */
938 memset(stream, 0, sizeof(*stream));
939 stream->next_in = map;
940 stream->avail_in = mapsize;
941 stream->next_out = buffer;
942 stream->avail_out = bufsiz;
944 if (legacy_loose_object(map)) {
946 return inflate(stream, 0);
949 used = unpack_object_header_gently(map, mapsize, &type, &size);
950 if (!used || !valid_loose_object_type[type])
955 /* Set up the stream for the rest.. */
956 stream->next_in = map;
957 stream->avail_in = mapsize;
960 /* And generate the fake traditional header */
961 stream->total_out = 1 + snprintf(buffer, bufsiz, "%s %lu",
962 typename(type), size);
966 static void *unpack_sha1_rest(z_stream *stream, void *buffer, unsigned long size)
968 int bytes = strlen(buffer) + 1;
969 unsigned char *buf = xmalloc(1+size);
972 n = stream->total_out - bytes;
975 memcpy(buf, (char *) buffer + bytes, n);
978 stream->next_out = buf + bytes;
979 stream->avail_out = size - bytes;
980 while (inflate(stream, Z_FINISH) == Z_OK)
989 * We used to just use "sscanf()", but that's actually way
990 * too permissive for what we want to check. So do an anal
991 * object header parse by hand.
993 static int parse_sha1_header(const char *hdr, unsigned long *sizep)
1000 * The type can be at most ten bytes (including the
1001 * terminating '\0' that we add), and is followed by
1010 if (i >= sizeof(type))
1016 * The length must follow immediately, and be in canonical
1017 * decimal format (ie "010" is not valid).
1019 size = *hdr++ - '0';
1024 unsigned long c = *hdr - '0';
1028 size = size * 10 + c;
1034 * The length must be followed by a zero byte
1036 return *hdr ? -1 : type_from_string(type);
1039 void * unpack_sha1_file(void *map, unsigned long mapsize, enum object_type *type, unsigned long *size)
1045 ret = unpack_sha1_header(&stream, map, mapsize, hdr, sizeof(hdr));
1046 if (ret < Z_OK || (*type = parse_sha1_header(hdr, size)) < 0)
1049 return unpack_sha1_rest(&stream, hdr, *size);
1052 static unsigned long get_delta_base(struct packed_git *p,
1053 struct pack_window **w_curs,
1054 unsigned long *curpos,
1055 enum object_type type,
1056 unsigned long delta_obj_offset)
1058 unsigned char *base_info = use_pack(p, w_curs, *curpos, NULL);
1059 unsigned long base_offset;
1061 /* use_pack() assured us we have [base_info, base_info + 20)
1062 * as a range that we can look at without walking off the
1063 * end of the mapped window. Its actually the hash size
1064 * that is assured. An OFS_DELTA longer than the hash size
1065 * is stupid, as then a REF_DELTA would be smaller to store.
1067 if (type == OBJ_OFS_DELTA) {
1069 unsigned char c = base_info[used++];
1070 base_offset = c & 127;
1073 if (!base_offset || base_offset & ~(~0UL >> 7))
1074 die("offset value overflow for delta base object");
1075 c = base_info[used++];
1076 base_offset = (base_offset << 7) + (c & 127);
1078 base_offset = delta_obj_offset - base_offset;
1079 if (base_offset >= delta_obj_offset)
1080 die("delta base offset out of bound");
1082 } else if (type == OBJ_REF_DELTA) {
1083 /* The base entry _must_ be in the same pack */
1084 base_offset = find_pack_entry_one(base_info, p);
1086 die("failed to find delta-pack base object %s",
1087 sha1_to_hex(base_info));
1090 die("I am totally screwed");
1094 /* forward declaration for a mutually recursive function */
1095 static int packed_object_info(struct packed_git *p, unsigned long offset,
1096 unsigned long *sizep);
1098 static int packed_delta_info(struct packed_git *p,
1099 struct pack_window **w_curs,
1100 unsigned long curpos,
1101 enum object_type type,
1102 unsigned long obj_offset,
1103 unsigned long *sizep)
1105 unsigned long base_offset;
1107 base_offset = get_delta_base(p, w_curs, &curpos, type, obj_offset);
1108 type = packed_object_info(p, base_offset, NULL);
1110 /* We choose to only get the type of the base object and
1111 * ignore potentially corrupt pack file that expects the delta
1112 * based on a base with a wrong size. This saves tons of
1116 const unsigned char *data;
1117 unsigned char delta_head[20], *in;
1121 memset(&stream, 0, sizeof(stream));
1122 stream.next_out = delta_head;
1123 stream.avail_out = sizeof(delta_head);
1125 inflateInit(&stream);
1127 in = use_pack(p, w_curs, curpos, &stream.avail_in);
1128 stream.next_in = in;
1129 st = inflate(&stream, Z_FINISH);
1130 curpos += stream.next_in - in;
1131 } while ((st == Z_OK || st == Z_BUF_ERROR)
1132 && stream.total_out < sizeof(delta_head));
1133 inflateEnd(&stream);
1134 if ((st != Z_STREAM_END) &&
1135 stream.total_out != sizeof(delta_head))
1136 die("delta data unpack-initial failed");
1138 /* Examine the initial part of the delta to figure out
1143 /* ignore base size */
1144 get_delta_hdr_size(&data, delta_head+sizeof(delta_head));
1146 /* Read the result size */
1147 *sizep = get_delta_hdr_size(&data, delta_head+sizeof(delta_head));
1153 static int unpack_object_header(struct packed_git *p,
1154 struct pack_window **w_curs,
1155 unsigned long *curpos,
1156 unsigned long *sizep)
1158 unsigned char *base;
1161 enum object_type type;
1163 /* use_pack() assures us we have [base, base + 20) available
1164 * as a range that we can look at at. (Its actually the hash
1165 * size that is assured.) With our object header encoding
1166 * the maximum deflated object size is 2^137, which is just
1167 * insane, so we know won't exceed what we have been given.
1169 base = use_pack(p, w_curs, *curpos, &left);
1170 used = unpack_object_header_gently(base, left, &type, sizep);
1172 die("object offset outside of pack file");
1178 const char *packed_object_info_detail(struct packed_git *p,
1179 unsigned long obj_offset,
1180 unsigned long *size,
1181 unsigned long *store_size,
1182 unsigned int *delta_chain_length,
1183 unsigned char *base_sha1)
1185 struct pack_window *w_curs = NULL;
1186 unsigned long curpos, dummy;
1187 unsigned char *next_sha1;
1188 enum object_type type;
1190 *delta_chain_length = 0;
1191 curpos = obj_offset;
1192 type = unpack_object_header(p, &w_curs, &curpos, size);
1197 die("pack %s contains unknown object type %d",
1198 p->pack_name, type);
1203 *store_size = 0; /* notyet */
1204 unuse_pack(&w_curs);
1205 return typename(type);
1207 obj_offset = get_delta_base(p, &w_curs, &curpos, type, obj_offset);
1208 if (*delta_chain_length == 0) {
1209 /* TODO: find base_sha1 as pointed by curpos */
1214 next_sha1 = use_pack(p, &w_curs, curpos, NULL);
1215 if (*delta_chain_length == 0)
1216 hashcpy(base_sha1, next_sha1);
1217 obj_offset = find_pack_entry_one(next_sha1, p);
1220 (*delta_chain_length)++;
1221 curpos = obj_offset;
1222 type = unpack_object_header(p, &w_curs, &curpos, &dummy);
1226 static int packed_object_info(struct packed_git *p, unsigned long obj_offset,
1227 unsigned long *sizep)
1229 struct pack_window *w_curs = NULL;
1230 unsigned long size, curpos = obj_offset;
1231 enum object_type type;
1233 type = unpack_object_header(p, &w_curs, &curpos, &size);
1238 type = packed_delta_info(p, &w_curs, curpos,
1239 type, obj_offset, sizep);
1249 die("pack %s contains unknown object type %d",
1250 p->pack_name, type);
1252 unuse_pack(&w_curs);
1256 static void *unpack_compressed_entry(struct packed_git *p,
1257 struct pack_window **w_curs,
1258 unsigned long curpos,
1263 unsigned char *buffer, *in;
1265 buffer = xmalloc(size + 1);
1267 memset(&stream, 0, sizeof(stream));
1268 stream.next_out = buffer;
1269 stream.avail_out = size;
1271 inflateInit(&stream);
1273 in = use_pack(p, w_curs, curpos, &stream.avail_in);
1274 stream.next_in = in;
1275 st = inflate(&stream, Z_FINISH);
1276 curpos += stream.next_in - in;
1277 } while (st == Z_OK || st == Z_BUF_ERROR);
1278 inflateEnd(&stream);
1279 if ((st != Z_STREAM_END) || stream.total_out != size) {
1287 static void *unpack_delta_entry(struct packed_git *p,
1288 struct pack_window **w_curs,
1289 unsigned long curpos,
1290 unsigned long delta_size,
1291 unsigned long obj_offset,
1292 enum object_type *type,
1293 unsigned long *sizep)
1295 void *delta_data, *result, *base;
1296 unsigned long base_size, base_offset;
1298 base_offset = get_delta_base(p, w_curs, &curpos, *type, obj_offset);
1299 base = unpack_entry(p, base_offset, type, &base_size);
1301 die("failed to read delta base object at %lu from %s",
1302 base_offset, p->pack_name);
1304 delta_data = unpack_compressed_entry(p, w_curs, curpos, delta_size);
1305 result = patch_delta(base, base_size,
1306 delta_data, delta_size,
1309 die("failed to apply delta");
1315 void *unpack_entry(struct packed_git *p, unsigned long obj_offset,
1316 enum object_type *type, unsigned long *sizep)
1318 struct pack_window *w_curs = NULL;
1319 unsigned long curpos = obj_offset;
1322 *type = unpack_object_header(p, &w_curs, &curpos, sizep);
1326 data = unpack_delta_entry(p, &w_curs, curpos, *sizep,
1327 obj_offset, type, sizep);
1333 data = unpack_compressed_entry(p, &w_curs, curpos, *sizep);
1336 die("unknown object type %i in %s", *type, p->pack_name);
1338 unuse_pack(&w_curs);
1342 uint32_t num_packed_objects(const struct packed_git *p)
1344 /* See check_packed_git_idx() */
1345 return (p->index_size - 20 - 20 - 4*256) / 24;
1348 int nth_packed_object_sha1(const struct packed_git *p, uint32_t n,
1349 unsigned char* sha1)
1351 void *index = p->index_base + 256;
1352 if (num_packed_objects(p) <= n)
1354 hashcpy(sha1, (unsigned char *) index + (24 * n) + 4);
1358 unsigned long find_pack_entry_one(const unsigned char *sha1,
1359 struct packed_git *p)
1361 uint32_t *level1_ofs = p->index_base;
1362 int hi = ntohl(level1_ofs[*sha1]);
1363 int lo = ((*sha1 == 0x0) ? 0 : ntohl(level1_ofs[*sha1 - 1]));
1364 void *index = p->index_base + 256;
1367 int mi = (lo + hi) / 2;
1368 int cmp = hashcmp((unsigned char *)index + (24 * mi) + 4, sha1);
1370 return ntohl(*((uint32_t *)((char *)index + (24 * mi))));
1379 static int matches_pack_name(struct packed_git *p, const char *ig)
1381 const char *last_c, *c;
1383 if (!strcmp(p->pack_name, ig))
1386 for (c = p->pack_name, last_c = c; *c;)
1391 if (!strcmp(last_c, ig))
1397 static int find_pack_entry(const unsigned char *sha1, struct pack_entry *e, const char **ignore_packed)
1399 struct packed_git *p;
1400 unsigned long offset;
1402 prepare_packed_git();
1404 for (p = packed_git; p; p = p->next) {
1405 if (ignore_packed) {
1407 for (ig = ignore_packed; *ig; ig++)
1408 if (!matches_pack_name(p, *ig))
1413 offset = find_pack_entry_one(sha1, p);
1416 * We are about to tell the caller where they can
1417 * locate the requested object. We better make
1418 * sure the packfile is still here and can be
1419 * accessed before supplying that answer, as
1420 * it may have been deleted since the index
1423 if (p->pack_fd == -1 && open_packed_git(p)) {
1424 error("packfile %s cannot be accessed", p->pack_name);
1429 hashcpy(e->sha1, sha1);
1436 struct packed_git *find_sha1_pack(const unsigned char *sha1,
1437 struct packed_git *packs)
1439 struct packed_git *p;
1441 for (p = packs; p; p = p->next) {
1442 if (find_pack_entry_one(sha1, p))
1449 static int sha1_loose_object_info(const unsigned char *sha1, unsigned long *sizep)
1452 unsigned long mapsize, size;
1457 map = map_sha1_file(sha1, &mapsize);
1459 return error("unable to find %s", sha1_to_hex(sha1));
1460 if (unpack_sha1_header(&stream, map, mapsize, hdr, sizeof(hdr)) < 0)
1461 status = error("unable to unpack %s header",
1463 else if ((status = parse_sha1_header(hdr, &size)) < 0)
1464 status = error("unable to parse %s header", sha1_to_hex(sha1));
1467 inflateEnd(&stream);
1468 munmap(map, mapsize);
1472 int sha1_object_info(const unsigned char *sha1, unsigned long *sizep)
1474 struct pack_entry e;
1476 if (!find_pack_entry(sha1, &e, NULL)) {
1477 reprepare_packed_git();
1478 if (!find_pack_entry(sha1, &e, NULL))
1479 return sha1_loose_object_info(sha1, sizep);
1481 return packed_object_info(e.p, e.offset, sizep);
1484 static void *read_packed_sha1(const unsigned char *sha1,
1485 enum object_type *type, unsigned long *size)
1487 struct pack_entry e;
1489 if (!find_pack_entry(sha1, &e, NULL))
1492 return unpack_entry(e.p, e.offset, type, size);
1496 * This is meant to hold a *small* number of objects that you would
1497 * want read_sha1_file() to be able to return, but yet you do not want
1498 * to write them into the object store (e.g. a browse-only
1501 static struct cached_object {
1502 unsigned char sha1[20];
1503 enum object_type type;
1507 static int cached_object_nr, cached_object_alloc;
1509 static struct cached_object *find_cached_object(const unsigned char *sha1)
1512 struct cached_object *co = cached_objects;
1514 for (i = 0; i < cached_object_nr; i++, co++) {
1515 if (!hashcmp(co->sha1, sha1))
1521 int pretend_sha1_file(void *buf, unsigned long len, enum object_type type,
1522 unsigned char *sha1)
1524 struct cached_object *co;
1526 hash_sha1_file(buf, len, typename(type), sha1);
1527 if (has_sha1_file(sha1) || find_cached_object(sha1))
1529 if (cached_object_alloc <= cached_object_nr) {
1530 cached_object_alloc = alloc_nr(cached_object_alloc);
1531 cached_objects = xrealloc(cached_objects,
1532 sizeof(*cached_objects) *
1533 cached_object_alloc);
1535 co = &cached_objects[cached_object_nr++];
1538 co->buf = xmalloc(len);
1539 memcpy(co->buf, buf, len);
1540 hashcpy(co->sha1, sha1);
1544 void *read_sha1_file(const unsigned char *sha1, enum object_type *type,
1545 unsigned long *size)
1547 unsigned long mapsize;
1549 struct cached_object *co;
1551 co = find_cached_object(sha1);
1553 buf = xmalloc(co->size + 1);
1554 memcpy(buf, co->buf, co->size);
1555 ((char*)buf)[co->size] = 0;
1561 buf = read_packed_sha1(sha1, type, size);
1564 map = map_sha1_file(sha1, &mapsize);
1566 buf = unpack_sha1_file(map, mapsize, type, size);
1567 munmap(map, mapsize);
1570 reprepare_packed_git();
1571 return read_packed_sha1(sha1, type, size);
1574 void *read_object_with_reference(const unsigned char *sha1,
1575 const char *required_type_name,
1576 unsigned long *size,
1577 unsigned char *actual_sha1_return)
1579 enum object_type type, required_type;
1581 unsigned long isize;
1582 unsigned char actual_sha1[20];
1584 required_type = type_from_string(required_type_name);
1585 hashcpy(actual_sha1, sha1);
1587 int ref_length = -1;
1588 const char *ref_type = NULL;
1590 buffer = read_sha1_file(actual_sha1, &type, &isize);
1593 if (type == required_type) {
1595 if (actual_sha1_return)
1596 hashcpy(actual_sha1_return, actual_sha1);
1599 /* Handle references */
1600 else if (type == OBJ_COMMIT)
1602 else if (type == OBJ_TAG)
1603 ref_type = "object ";
1608 ref_length = strlen(ref_type);
1610 if (memcmp(buffer, ref_type, ref_length) ||
1611 get_sha1_hex((char *) buffer + ref_length, actual_sha1)) {
1616 /* Now we have the ID of the referred-to object in
1617 * actual_sha1. Check again. */
1621 static void write_sha1_file_prepare(void *buf, unsigned long len,
1622 const char *type, unsigned char *sha1,
1623 char *hdr, int *hdrlen)
1627 /* Generate the header */
1628 *hdrlen = sprintf(hdr, "%s %lu", type, len)+1;
1632 SHA1_Update(&c, hdr, *hdrlen);
1633 SHA1_Update(&c, buf, len);
1634 SHA1_Final(sha1, &c);
1638 * Link the tempfile to the final place, possibly creating the
1639 * last directory level as you do so.
1641 * Returns the errno on failure, 0 on success.
1643 static int link_temp_to_file(const char *tmpfile, const char *filename)
1648 if (!link(tmpfile, filename))
1652 * Try to mkdir the last path component if that failed.
1654 * Re-try the "link()" regardless of whether the mkdir
1655 * succeeds, since a race might mean that somebody
1659 dir = strrchr(filename, '/');
1662 if (!mkdir(filename, 0777) && adjust_shared_perm(filename)) {
1667 if (!link(tmpfile, filename))
1675 * Move the just written object into its final resting place
1677 int move_temp_to_file(const char *tmpfile, const char *filename)
1679 int ret = link_temp_to_file(tmpfile, filename);
1682 * Coda hack - coda doesn't like cross-directory links,
1683 * so we fall back to a rename, which will mean that it
1684 * won't be able to check collisions, but that's not a
1687 * The same holds for FAT formatted media.
1689 * When this succeeds, we just return 0. We have nothing
1692 if (ret && ret != EEXIST) {
1693 if (!rename(tmpfile, filename))
1699 if (ret != EEXIST) {
1700 return error("unable to write sha1 filename %s: %s\n", filename, strerror(ret));
1702 /* FIXME!!! Collision check here ? */
1708 static int write_buffer(int fd, const void *buf, size_t len)
1710 if (write_in_full(fd, buf, len) < 0)
1711 return error("file write error (%s)", strerror(errno));
1715 static int write_binary_header(unsigned char *hdr, enum object_type type, unsigned long len)
1720 c = (type << 4) | (len & 15);
1733 static void setup_object_header(z_stream *stream, const char *type, unsigned long len)
1735 int obj_type, hdrlen;
1737 if (use_legacy_headers) {
1738 while (deflate(stream, 0) == Z_OK)
1742 obj_type = type_from_string(type);
1743 hdrlen = write_binary_header(stream->next_out, obj_type, len);
1744 stream->total_out = hdrlen;
1745 stream->next_out += hdrlen;
1746 stream->avail_out -= hdrlen;
1749 int hash_sha1_file(void *buf, unsigned long len, const char *type,
1750 unsigned char *sha1)
1754 write_sha1_file_prepare(buf, len, type, sha1, hdr, &hdrlen);
1758 int write_sha1_file(void *buf, unsigned long len, const char *type, unsigned char *returnsha1)
1761 unsigned char *compressed;
1763 unsigned char sha1[20];
1765 static char tmpfile[PATH_MAX];
1769 /* Normally if we have it in the pack then we do not bother writing
1770 * it out into .git/objects/??/?{38} file.
1772 write_sha1_file_prepare(buf, len, type, sha1, hdr, &hdrlen);
1773 filename = sha1_file_name(sha1);
1775 hashcpy(returnsha1, sha1);
1776 if (has_sha1_file(sha1))
1778 fd = open(filename, O_RDONLY);
1781 * FIXME!!! We might do collision checking here, but we'd
1782 * need to uncompress the old file and check it. Later.
1788 if (errno != ENOENT) {
1789 return error("sha1 file %s: %s\n", filename, strerror(errno));
1792 snprintf(tmpfile, sizeof(tmpfile), "%s/obj_XXXXXX", get_object_directory());
1794 fd = mkstemp(tmpfile);
1797 return error("insufficient permission for adding an object to repository database %s\n", get_object_directory());
1799 return error("unable to create temporary sha1 filename %s: %s\n", tmpfile, strerror(errno));
1803 memset(&stream, 0, sizeof(stream));
1804 deflateInit(&stream, zlib_compression_level);
1805 size = 8 + deflateBound(&stream, len+hdrlen);
1806 compressed = xmalloc(size);
1809 stream.next_out = compressed;
1810 stream.avail_out = size;
1812 /* First header.. */
1813 stream.next_in = (unsigned char *)hdr;
1814 stream.avail_in = hdrlen;
1815 setup_object_header(&stream, type, len);
1817 /* Then the data itself.. */
1818 stream.next_in = buf;
1819 stream.avail_in = len;
1820 while (deflate(&stream, Z_FINISH) == Z_OK)
1822 deflateEnd(&stream);
1823 size = stream.total_out;
1825 if (write_buffer(fd, compressed, size) < 0)
1826 die("unable to write sha1 file");
1831 return move_temp_to_file(tmpfile, filename);
1835 * We need to unpack and recompress the object for writing
1836 * it out to a different file.
1838 static void *repack_object(const unsigned char *sha1, unsigned long *objsize)
1842 unsigned char *unpacked;
1844 enum object_type type;
1849 /* need to unpack and recompress it by itself */
1850 unpacked = read_packed_sha1(sha1, &type, &len);
1852 error("cannot read sha1_file for %s", sha1_to_hex(sha1));
1854 hdrlen = sprintf(hdr, "%s %lu", typename(type), len) + 1;
1857 memset(&stream, 0, sizeof(stream));
1858 deflateInit(&stream, zlib_compression_level);
1859 size = deflateBound(&stream, len + hdrlen);
1860 buf = xmalloc(size);
1863 stream.next_out = buf;
1864 stream.avail_out = size;
1866 /* First header.. */
1867 stream.next_in = (void *)hdr;
1868 stream.avail_in = hdrlen;
1869 while (deflate(&stream, 0) == Z_OK)
1872 /* Then the data itself.. */
1873 stream.next_in = unpacked;
1874 stream.avail_in = len;
1875 while (deflate(&stream, Z_FINISH) == Z_OK)
1877 deflateEnd(&stream);
1880 *objsize = stream.total_out;
1884 int write_sha1_to_fd(int fd, const unsigned char *sha1)
1887 unsigned long objsize;
1888 void *buf = map_sha1_file(sha1, &objsize);
1891 retval = write_buffer(fd, buf, objsize);
1892 munmap(buf, objsize);
1896 buf = repack_object(sha1, &objsize);
1897 retval = write_buffer(fd, buf, objsize);
1902 int write_sha1_from_fd(const unsigned char *sha1, int fd, char *buffer,
1903 size_t bufsize, size_t *bufposn)
1905 char tmpfile[PATH_MAX];
1908 unsigned char real_sha1[20];
1909 unsigned char discard[4096];
1913 snprintf(tmpfile, sizeof(tmpfile), "%s/obj_XXXXXX", get_object_directory());
1915 local = mkstemp(tmpfile);
1918 return error("insufficient permission for adding an object to repository database %s\n", get_object_directory());
1920 return error("unable to create temporary sha1 filename %s: %s\n", tmpfile, strerror(errno));
1923 memset(&stream, 0, sizeof(stream));
1925 inflateInit(&stream);
1932 stream.avail_in = *bufposn;
1933 stream.next_in = (unsigned char *) buffer;
1935 stream.next_out = discard;
1936 stream.avail_out = sizeof(discard);
1937 ret = inflate(&stream, Z_SYNC_FLUSH);
1938 SHA1_Update(&c, discard, sizeof(discard) -
1940 } while (stream.avail_in && ret == Z_OK);
1941 if (write_buffer(local, buffer, *bufposn - stream.avail_in) < 0)
1942 die("unable to write sha1 file");
1943 memmove(buffer, buffer + *bufposn - stream.avail_in,
1945 *bufposn = stream.avail_in;
1949 size = xread(fd, buffer + *bufposn, bufsize - *bufposn);
1954 return error("Connection closed?");
1955 perror("Reading from connection");
1960 inflateEnd(&stream);
1963 SHA1_Final(real_sha1, &c);
1964 if (ret != Z_STREAM_END) {
1966 return error("File %s corrupted", sha1_to_hex(sha1));
1968 if (hashcmp(sha1, real_sha1)) {
1970 return error("File %s has bad hash", sha1_to_hex(sha1));
1973 return move_temp_to_file(tmpfile, sha1_file_name(sha1));
1976 int has_pack_index(const unsigned char *sha1)
1979 if (stat(sha1_pack_index_name(sha1), &st))
1984 int has_pack_file(const unsigned char *sha1)
1987 if (stat(sha1_pack_name(sha1), &st))
1992 int has_sha1_pack(const unsigned char *sha1, const char **ignore_packed)
1994 struct pack_entry e;
1995 return find_pack_entry(sha1, &e, ignore_packed);
1998 int has_sha1_file(const unsigned char *sha1)
2001 struct pack_entry e;
2003 if (find_pack_entry(sha1, &e, NULL))
2005 return find_sha1_file(sha1, &st) ? 1 : 0;
2009 * reads from fd as long as possible into a supplied buffer of size bytes.
2010 * If necessary the buffer's size is increased using realloc()
2012 * returns 0 if anything went fine and -1 otherwise
2014 * NOTE: both buf and size may change, but even when -1 is returned
2015 * you still have to free() it yourself.
2017 int read_pipe(int fd, char** return_buf, unsigned long* return_size)
2019 char* buf = *return_buf;
2020 unsigned long size = *return_size;
2022 unsigned long off = 0;
2025 iret = xread(fd, buf + off, size - off);
2030 buf = xrealloc(buf, size);
2043 int index_pipe(unsigned char *sha1, int fd, const char *type, int write_object)
2045 unsigned long size = 4096;
2046 char *buf = xmalloc(size);
2049 if (read_pipe(fd, &buf, &size)) {
2057 ret = write_sha1_file(buf, size, type, sha1);
2059 ret = hash_sha1_file(buf, size, type, sha1);
2064 int index_fd(unsigned char *sha1, int fd, struct stat *st, int write_object,
2065 enum object_type type, const char *path)
2067 unsigned long size = st->st_size;
2069 int ret, re_allocated = 0;
2072 buf = xmmap(NULL, size, PROT_READ, MAP_PRIVATE, fd, 0);
2079 * Convert blobs to git internal format
2081 if ((type == OBJ_BLOB) && S_ISREG(st->st_mode)) {
2082 unsigned long nsize = size;
2084 if (convert_to_git(path, &nbuf, &nsize)) {
2094 ret = write_sha1_file(buf, size, typename(type), sha1);
2096 ret = hash_sha1_file(buf, size, typename(type), sha1);
2106 int index_path(unsigned char *sha1, const char *path, struct stat *st, int write_object)
2111 switch (st->st_mode & S_IFMT) {
2113 fd = open(path, O_RDONLY);
2115 return error("open(\"%s\"): %s", path,
2117 if (index_fd(sha1, fd, st, write_object, OBJ_BLOB, path) < 0)
2118 return error("%s: failed to insert into database",
2122 target = xmalloc(st->st_size+1);
2123 if (readlink(path, target, st->st_size+1) != st->st_size) {
2124 char *errstr = strerror(errno);
2126 return error("readlink(\"%s\"): %s", path,
2130 hash_sha1_file(target, st->st_size, blob_type, sha1);
2131 else if (write_sha1_file(target, st->st_size, blob_type, sha1))
2132 return error("%s: failed to insert into database",
2137 return error("%s: unsupported file type", path);
2142 int read_pack_header(int fd, struct pack_header *header)
2144 char *c = (char*)header;
2145 ssize_t remaining = sizeof(struct pack_header);
2147 ssize_t r = xread(fd, c, remaining);
2149 /* "eof before pack header was fully read" */
2150 return PH_ERROR_EOF;
2153 } while (remaining > 0);
2154 if (header->hdr_signature != htonl(PACK_SIGNATURE))
2155 /* "protocol error (pack signature mismatch detected)" */
2156 return PH_ERROR_PACK_SIGNATURE;
2157 if (!pack_version_ok(header->hdr_version))
2158 /* "protocol error (pack version unsupported)" */
2159 return PH_ERROR_PROTOCOL;