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, unsigned long *idx_size_,
438 unsigned long idx_size;
440 int fd = open(path, O_RDONLY);
444 if (fstat(fd, &st)) {
448 idx_size = st.st_size;
449 idx_map = xmmap(NULL, idx_size, PROT_READ, MAP_PRIVATE, fd, 0);
454 *idx_size_ = idx_size;
456 /* check index map */
457 if (idx_size < 4*256 + 20 + 20)
458 return error("index file %s is too small", path);
460 /* a future index format would start with this, as older git
461 * binaries would fail the non-monotonic index check below.
462 * give a nicer warning to the user if we can.
464 if (index[0] == htonl(PACK_IDX_SIGNATURE))
465 return error("index file %s is a newer version"
466 " and is not supported by this binary"
467 " (try upgrading GIT to a newer version)",
471 for (i = 0; i < 256; i++) {
472 unsigned int n = ntohl(index[i]);
474 return error("non-monotonic index %s", path);
480 * - 256 index entries 4 bytes each
481 * - 24-byte entries * nr (20-byte sha1 + 4-byte offset)
482 * - 20-byte SHA1 of the packfile
483 * - 20-byte SHA1 file checksum
485 if (idx_size != 4*256 + nr * 24 + 20 + 20)
486 return error("wrong index file size in %s", path);
491 static void scan_windows(struct packed_git *p,
492 struct packed_git **lru_p,
493 struct pack_window **lru_w,
494 struct pack_window **lru_l)
496 struct pack_window *w, *w_l;
498 for (w_l = NULL, w = p->windows; w; w = w->next) {
500 if (!*lru_w || w->last_used < (*lru_w)->last_used) {
510 static int unuse_one_window(struct packed_git *current)
512 struct packed_git *p, *lru_p = NULL;
513 struct pack_window *lru_w = NULL, *lru_l = NULL;
516 scan_windows(current, &lru_p, &lru_w, &lru_l);
517 for (p = packed_git; p; p = p->next)
518 scan_windows(p, &lru_p, &lru_w, &lru_l);
520 munmap(lru_w->base, lru_w->len);
521 pack_mapped -= lru_w->len;
523 lru_l->next = lru_w->next;
525 lru_p->windows = lru_w->next;
526 if (!lru_p->windows && lru_p != current) {
527 close(lru_p->pack_fd);
538 void release_pack_memory(size_t need)
540 size_t cur = pack_mapped;
541 while (need >= (cur - pack_mapped) && unuse_one_window(NULL))
545 void unuse_pack(struct pack_window **w_cursor)
547 struct pack_window *w = *w_cursor;
555 * Do not call this directly as this leaks p->pack_fd on error return;
556 * call open_packed_git() instead.
558 static int open_packed_git_1(struct packed_git *p)
561 struct pack_header hdr;
562 unsigned char sha1[20];
563 unsigned char *idx_sha1;
566 p->pack_fd = open(p->pack_name, O_RDONLY);
567 if (p->pack_fd < 0 || fstat(p->pack_fd, &st))
570 /* If we created the struct before we had the pack we lack size. */
572 if (!S_ISREG(st.st_mode))
573 return error("packfile %s not a regular file", p->pack_name);
574 p->pack_size = st.st_size;
575 } else if (p->pack_size != st.st_size)
576 return error("packfile %s size changed", p->pack_name);
578 /* We leave these file descriptors open with sliding mmap;
579 * there is no point keeping them open across exec(), though.
581 fd_flag = fcntl(p->pack_fd, F_GETFD, 0);
583 return error("cannot determine file descriptor flags");
584 fd_flag |= FD_CLOEXEC;
585 if (fcntl(p->pack_fd, F_SETFD, fd_flag) == -1)
586 return error("cannot set FD_CLOEXEC");
588 /* Verify we recognize this pack file format. */
589 if (read_in_full(p->pack_fd, &hdr, sizeof(hdr)) != sizeof(hdr))
590 return error("file %s is far too short to be a packfile", p->pack_name);
591 if (hdr.hdr_signature != htonl(PACK_SIGNATURE))
592 return error("file %s is not a GIT packfile", p->pack_name);
593 if (!pack_version_ok(hdr.hdr_version))
594 return error("packfile %s is version %u and not supported"
595 " (try upgrading GIT to a newer version)",
596 p->pack_name, ntohl(hdr.hdr_version));
598 /* Verify the pack matches its index. */
599 if (num_packed_objects(p) != ntohl(hdr.hdr_entries))
600 return error("packfile %s claims to have %u objects"
601 " while index size indicates %u objects",
602 p->pack_name, ntohl(hdr.hdr_entries),
603 num_packed_objects(p));
604 if (lseek(p->pack_fd, p->pack_size - sizeof(sha1), SEEK_SET) == -1)
605 return error("end of packfile %s is unavailable", p->pack_name);
606 if (read_in_full(p->pack_fd, sha1, sizeof(sha1)) != sizeof(sha1))
607 return error("packfile %s signature is unavailable", p->pack_name);
608 idx_sha1 = ((unsigned char *)p->index_base) + p->index_size - 40;
609 if (hashcmp(sha1, idx_sha1))
610 return error("packfile %s does not match index", p->pack_name);
614 static int open_packed_git(struct packed_git *p)
616 if (!open_packed_git_1(p))
618 if (p->pack_fd != -1) {
625 static int in_window(struct pack_window *win, unsigned long offset)
627 /* We must promise at least 20 bytes (one hash) after the
628 * offset is available from this window, otherwise the offset
629 * is not actually in this window and a different window (which
630 * has that one hash excess) must be used. This is to support
631 * the object header and delta base parsing routines below.
633 off_t win_off = win->offset;
634 return win_off <= offset
635 && (offset + 20) <= (win_off + win->len);
638 unsigned char* use_pack(struct packed_git *p,
639 struct pack_window **w_cursor,
640 unsigned long offset,
643 struct pack_window *win = *w_cursor;
645 if (p->pack_fd == -1 && open_packed_git(p))
646 die("packfile %s cannot be accessed", p->pack_name);
648 /* Since packfiles end in a hash of their content and its
649 * pointless to ask for an offset into the middle of that
650 * hash, and the in_window function above wouldn't match
651 * don't allow an offset too close to the end of the file.
653 if (offset > (p->pack_size - 20))
654 die("offset beyond end of packfile (truncated pack?)");
656 if (!win || !in_window(win, offset)) {
659 for (win = p->windows; win; win = win->next) {
660 if (in_window(win, offset))
664 size_t window_align = packed_git_window_size / 2;
665 win = xcalloc(1, sizeof(*win));
666 win->offset = (offset / window_align) * window_align;
667 win->len = p->pack_size - win->offset;
668 if (win->len > packed_git_window_size)
669 win->len = packed_git_window_size;
670 pack_mapped += win->len;
671 while (packed_git_limit < pack_mapped
672 && unuse_one_window(p))
674 win->base = xmmap(NULL, win->len,
675 PROT_READ, MAP_PRIVATE,
676 p->pack_fd, win->offset);
677 if (win->base == MAP_FAILED)
678 die("packfile %s cannot be mapped: %s",
683 if (pack_mapped > peak_pack_mapped)
684 peak_pack_mapped = pack_mapped;
685 if (pack_open_windows > peak_pack_open_windows)
686 peak_pack_open_windows = pack_open_windows;
687 win->next = p->windows;
691 if (win != *w_cursor) {
692 win->last_used = pack_used_ctr++;
696 offset -= win->offset;
698 *left = win->len - offset;
699 return win->base + offset;
702 struct packed_git *add_packed_git(char *path, int path_len, int local)
705 struct packed_git *p;
706 unsigned long idx_size;
708 unsigned char sha1[20];
710 if (check_packed_git_idx(path, &idx_size, &idx_map))
713 /* do we have a corresponding .pack file? */
714 strcpy(path + path_len - 4, ".pack");
715 if (stat(path, &st) || !S_ISREG(st.st_mode)) {
716 munmap(idx_map, idx_size);
719 /* ok, it looks sane as far as we can check without
720 * actually mapping the pack file.
722 p = xmalloc(sizeof(*p) + path_len + 2);
723 strcpy(p->pack_name, path);
724 p->index_size = idx_size;
725 p->pack_size = st.st_size;
726 p->index_base = idx_map;
730 p->pack_local = local;
731 if ((path_len > 44) && !get_sha1_hex(path + path_len - 44, sha1))
732 hashcpy(p->sha1, sha1);
736 struct packed_git *parse_pack_index(unsigned char *sha1)
738 char *path = sha1_pack_index_name(sha1);
739 return parse_pack_index_file(sha1, path);
742 struct packed_git *parse_pack_index_file(const unsigned char *sha1, char *idx_path)
744 struct packed_git *p;
745 unsigned long idx_size;
749 if (check_packed_git_idx(idx_path, &idx_size, &idx_map))
752 path = sha1_pack_name(sha1);
754 p = xmalloc(sizeof(*p) + strlen(path) + 2);
755 strcpy(p->pack_name, path);
756 p->index_size = idx_size;
758 p->index_base = idx_map;
762 hashcpy(p->sha1, sha1);
766 void install_packed_git(struct packed_git *pack)
768 pack->next = packed_git;
772 static void prepare_packed_git_one(char *objdir, int local)
779 sprintf(path, "%s/pack", objdir);
784 error("unable to open object pack directory: %s: %s",
785 path, strerror(errno));
789 while ((de = readdir(dir)) != NULL) {
790 int namelen = strlen(de->d_name);
791 struct packed_git *p;
793 if (!has_extension(de->d_name, ".idx"))
796 /* Don't reopen a pack we already have. */
797 strcpy(path + len, de->d_name);
798 for (p = packed_git; p; p = p->next) {
799 if (!memcmp(path, p->pack_name, len + namelen - 4))
804 /* See if it really is a valid .idx file with corresponding
805 * .pack file that we can map.
807 p = add_packed_git(path, len + namelen, local);
810 install_packed_git(p);
815 static int prepare_packed_git_run_once = 0;
816 void prepare_packed_git(void)
818 struct alternate_object_database *alt;
820 if (prepare_packed_git_run_once)
822 prepare_packed_git_one(get_object_directory(), 1);
824 for (alt = alt_odb_list; alt; alt = alt->next) {
826 prepare_packed_git_one(alt->base, 0);
829 prepare_packed_git_run_once = 1;
832 void reprepare_packed_git(void)
834 prepare_packed_git_run_once = 0;
835 prepare_packed_git();
838 int check_sha1_signature(const unsigned char *sha1, void *map, unsigned long size, const char *type)
840 unsigned char real_sha1[20];
841 hash_sha1_file(map, size, type, real_sha1);
842 return hashcmp(sha1, real_sha1) ? -1 : 0;
845 void *map_sha1_file(const unsigned char *sha1, unsigned long *size)
850 char *filename = find_sha1_file(sha1, &st);
856 fd = open(filename, O_RDONLY | sha1_file_open_flag);
858 /* See if it works without O_NOATIME */
859 switch (sha1_file_open_flag) {
861 fd = open(filename, O_RDONLY);
869 /* If it failed once, it will probably fail again.
870 * Stop using O_NOATIME
872 sha1_file_open_flag = 0;
874 map = xmmap(NULL, st.st_size, PROT_READ, MAP_PRIVATE, fd, 0);
880 int legacy_loose_object(unsigned char *map)
885 * Is it a zlib-compressed buffer? If so, the first byte
886 * must be 0x78 (15-bit window size, deflated), and the
887 * first 16-bit word is evenly divisible by 31
889 word = (map[0] << 8) + map[1];
890 if (map[0] == 0x78 && !(word % 31))
896 unsigned long unpack_object_header_gently(const unsigned char *buf, unsigned long len, enum object_type *type, unsigned long *sizep)
901 unsigned long used = 0;
904 *type = (c >> 4) & 7;
910 if (sizeof(long) * 8 <= shift)
913 size += (c & 0x7f) << shift;
920 static int unpack_sha1_header(z_stream *stream, unsigned char *map, unsigned long mapsize, void *buffer, unsigned long bufsiz)
922 unsigned long size, used;
923 static const char valid_loose_object_type[8] = {
925 1, 1, 1, 1, /* "commit", "tree", "blob", "tag" */
926 0, /* "delta" and others are invalid in a loose object */
928 enum object_type type;
930 /* Get the data stream */
931 memset(stream, 0, sizeof(*stream));
932 stream->next_in = map;
933 stream->avail_in = mapsize;
934 stream->next_out = buffer;
935 stream->avail_out = bufsiz;
937 if (legacy_loose_object(map)) {
939 return inflate(stream, 0);
942 used = unpack_object_header_gently(map, mapsize, &type, &size);
943 if (!used || !valid_loose_object_type[type])
948 /* Set up the stream for the rest.. */
949 stream->next_in = map;
950 stream->avail_in = mapsize;
953 /* And generate the fake traditional header */
954 stream->total_out = 1 + snprintf(buffer, bufsiz, "%s %lu",
955 typename(type), size);
959 static void *unpack_sha1_rest(z_stream *stream, void *buffer, unsigned long size, const unsigned char *sha1)
961 int bytes = strlen(buffer) + 1;
962 unsigned char *buf = xmalloc(1+size);
966 n = stream->total_out - bytes;
969 memcpy(buf, (char *) buffer + bytes, n);
972 stream->next_out = buf + bytes;
973 stream->avail_out = size - bytes;
974 while (status == Z_OK)
975 status = inflate(stream, Z_FINISH);
978 if ((status == Z_OK || status == Z_STREAM_END) && !stream->avail_in) {
984 error("corrupt loose object '%s'", sha1_to_hex(sha1));
985 else if (stream->avail_in)
986 error("garbage at end of loose object '%s'",
993 * We used to just use "sscanf()", but that's actually way
994 * too permissive for what we want to check. So do an anal
995 * object header parse by hand.
997 static int parse_sha1_header(const char *hdr, unsigned long *sizep)
1004 * The type can be at most ten bytes (including the
1005 * terminating '\0' that we add), and is followed by
1014 if (i >= sizeof(type))
1020 * The length must follow immediately, and be in canonical
1021 * decimal format (ie "010" is not valid).
1023 size = *hdr++ - '0';
1028 unsigned long c = *hdr - '0';
1032 size = size * 10 + c;
1038 * The length must be followed by a zero byte
1040 return *hdr ? -1 : type_from_string(type);
1043 static void *unpack_sha1_file(void *map, unsigned long mapsize, enum object_type *type, unsigned long *size, const unsigned char *sha1)
1049 ret = unpack_sha1_header(&stream, map, mapsize, hdr, sizeof(hdr));
1050 if (ret < Z_OK || (*type = parse_sha1_header(hdr, size)) < 0)
1053 return unpack_sha1_rest(&stream, hdr, *size, sha1);
1056 static unsigned long get_delta_base(struct packed_git *p,
1057 struct pack_window **w_curs,
1058 unsigned long *curpos,
1059 enum object_type type,
1060 unsigned long delta_obj_offset)
1062 unsigned char *base_info = use_pack(p, w_curs, *curpos, NULL);
1063 unsigned long base_offset;
1065 /* use_pack() assured us we have [base_info, base_info + 20)
1066 * as a range that we can look at without walking off the
1067 * end of the mapped window. Its actually the hash size
1068 * that is assured. An OFS_DELTA longer than the hash size
1069 * is stupid, as then a REF_DELTA would be smaller to store.
1071 if (type == OBJ_OFS_DELTA) {
1073 unsigned char c = base_info[used++];
1074 base_offset = c & 127;
1077 if (!base_offset || base_offset & ~(~0UL >> 7))
1078 die("offset value overflow for delta base object");
1079 c = base_info[used++];
1080 base_offset = (base_offset << 7) + (c & 127);
1082 base_offset = delta_obj_offset - base_offset;
1083 if (base_offset >= delta_obj_offset)
1084 die("delta base offset out of bound");
1086 } else if (type == OBJ_REF_DELTA) {
1087 /* The base entry _must_ be in the same pack */
1088 base_offset = find_pack_entry_one(base_info, p);
1090 die("failed to find delta-pack base object %s",
1091 sha1_to_hex(base_info));
1094 die("I am totally screwed");
1098 /* forward declaration for a mutually recursive function */
1099 static int packed_object_info(struct packed_git *p, unsigned long offset,
1100 unsigned long *sizep);
1102 static int packed_delta_info(struct packed_git *p,
1103 struct pack_window **w_curs,
1104 unsigned long curpos,
1105 enum object_type type,
1106 unsigned long obj_offset,
1107 unsigned long *sizep)
1109 unsigned long base_offset;
1111 base_offset = get_delta_base(p, w_curs, &curpos, type, obj_offset);
1112 type = packed_object_info(p, base_offset, NULL);
1114 /* We choose to only get the type of the base object and
1115 * ignore potentially corrupt pack file that expects the delta
1116 * based on a base with a wrong size. This saves tons of
1120 const unsigned char *data;
1121 unsigned char delta_head[20], *in;
1125 memset(&stream, 0, sizeof(stream));
1126 stream.next_out = delta_head;
1127 stream.avail_out = sizeof(delta_head);
1129 inflateInit(&stream);
1131 in = use_pack(p, w_curs, curpos, &stream.avail_in);
1132 stream.next_in = in;
1133 st = inflate(&stream, Z_FINISH);
1134 curpos += stream.next_in - in;
1135 } while ((st == Z_OK || st == Z_BUF_ERROR)
1136 && stream.total_out < sizeof(delta_head));
1137 inflateEnd(&stream);
1138 if ((st != Z_STREAM_END) &&
1139 stream.total_out != sizeof(delta_head))
1140 die("delta data unpack-initial failed");
1142 /* Examine the initial part of the delta to figure out
1147 /* ignore base size */
1148 get_delta_hdr_size(&data, delta_head+sizeof(delta_head));
1150 /* Read the result size */
1151 *sizep = get_delta_hdr_size(&data, delta_head+sizeof(delta_head));
1157 static int unpack_object_header(struct packed_git *p,
1158 struct pack_window **w_curs,
1159 unsigned long *curpos,
1160 unsigned long *sizep)
1162 unsigned char *base;
1165 enum object_type type;
1167 /* use_pack() assures us we have [base, base + 20) available
1168 * as a range that we can look at at. (Its actually the hash
1169 * size that is assured.) With our object header encoding
1170 * the maximum deflated object size is 2^137, which is just
1171 * insane, so we know won't exceed what we have been given.
1173 base = use_pack(p, w_curs, *curpos, &left);
1174 used = unpack_object_header_gently(base, left, &type, sizep);
1176 die("object offset outside of pack file");
1182 const char *packed_object_info_detail(struct packed_git *p,
1183 unsigned long obj_offset,
1184 unsigned long *size,
1185 unsigned long *store_size,
1186 unsigned int *delta_chain_length,
1187 unsigned char *base_sha1)
1189 struct pack_window *w_curs = NULL;
1190 unsigned long curpos, dummy;
1191 unsigned char *next_sha1;
1192 enum object_type type;
1194 *delta_chain_length = 0;
1195 curpos = obj_offset;
1196 type = unpack_object_header(p, &w_curs, &curpos, size);
1201 die("pack %s contains unknown object type %d",
1202 p->pack_name, type);
1207 *store_size = 0; /* notyet */
1208 unuse_pack(&w_curs);
1209 return typename(type);
1211 obj_offset = get_delta_base(p, &w_curs, &curpos, type, obj_offset);
1212 if (*delta_chain_length == 0) {
1213 /* TODO: find base_sha1 as pointed by curpos */
1217 next_sha1 = use_pack(p, &w_curs, curpos, NULL);
1218 if (*delta_chain_length == 0)
1219 hashcpy(base_sha1, next_sha1);
1220 obj_offset = find_pack_entry_one(next_sha1, p);
1223 (*delta_chain_length)++;
1224 curpos = obj_offset;
1225 type = unpack_object_header(p, &w_curs, &curpos, &dummy);
1229 static int packed_object_info(struct packed_git *p, unsigned long obj_offset,
1230 unsigned long *sizep)
1232 struct pack_window *w_curs = NULL;
1233 unsigned long size, curpos = obj_offset;
1234 enum object_type type;
1236 type = unpack_object_header(p, &w_curs, &curpos, &size);
1241 type = packed_delta_info(p, &w_curs, curpos,
1242 type, obj_offset, sizep);
1252 die("pack %s contains unknown object type %d",
1253 p->pack_name, type);
1255 unuse_pack(&w_curs);
1259 static void *unpack_compressed_entry(struct packed_git *p,
1260 struct pack_window **w_curs,
1261 unsigned long curpos,
1266 unsigned char *buffer, *in;
1268 buffer = xmalloc(size + 1);
1270 memset(&stream, 0, sizeof(stream));
1271 stream.next_out = buffer;
1272 stream.avail_out = size;
1274 inflateInit(&stream);
1276 in = use_pack(p, w_curs, curpos, &stream.avail_in);
1277 stream.next_in = in;
1278 st = inflate(&stream, Z_FINISH);
1279 curpos += stream.next_in - in;
1280 } while (st == Z_OK || st == Z_BUF_ERROR);
1281 inflateEnd(&stream);
1282 if ((st != Z_STREAM_END) || stream.total_out != size) {
1290 static void *unpack_delta_entry(struct packed_git *p,
1291 struct pack_window **w_curs,
1292 unsigned long curpos,
1293 unsigned long delta_size,
1294 unsigned long obj_offset,
1295 enum object_type *type,
1296 unsigned long *sizep)
1298 void *delta_data, *result, *base;
1299 unsigned long base_size, base_offset;
1301 base_offset = get_delta_base(p, w_curs, &curpos, *type, obj_offset);
1302 base = unpack_entry(p, base_offset, type, &base_size);
1304 die("failed to read delta base object at %lu from %s",
1305 base_offset, p->pack_name);
1307 delta_data = unpack_compressed_entry(p, w_curs, curpos, delta_size);
1308 result = patch_delta(base, base_size,
1309 delta_data, delta_size,
1312 die("failed to apply delta");
1318 void *unpack_entry(struct packed_git *p, unsigned long obj_offset,
1319 enum object_type *type, unsigned long *sizep)
1321 struct pack_window *w_curs = NULL;
1322 unsigned long curpos = obj_offset;
1325 *type = unpack_object_header(p, &w_curs, &curpos, sizep);
1329 data = unpack_delta_entry(p, &w_curs, curpos, *sizep,
1330 obj_offset, type, sizep);
1336 data = unpack_compressed_entry(p, &w_curs, curpos, *sizep);
1339 die("unknown object type %i in %s", *type, p->pack_name);
1341 unuse_pack(&w_curs);
1345 int num_packed_objects(const struct packed_git *p)
1347 /* See check_packed_git_idx() */
1348 return (p->index_size - 20 - 20 - 4*256) / 24;
1351 int nth_packed_object_sha1(const struct packed_git *p, int n,
1352 unsigned char* sha1)
1354 void *index = p->index_base + 256;
1355 if (n < 0 || num_packed_objects(p) <= n)
1357 hashcpy(sha1, (unsigned char *) index + (24 * n) + 4);
1361 unsigned long find_pack_entry_one(const unsigned char *sha1,
1362 struct packed_git *p)
1364 uint32_t *level1_ofs = p->index_base;
1365 int hi = ntohl(level1_ofs[*sha1]);
1366 int lo = ((*sha1 == 0x0) ? 0 : ntohl(level1_ofs[*sha1 - 1]));
1367 void *index = p->index_base + 256;
1370 int mi = (lo + hi) / 2;
1371 int cmp = hashcmp((unsigned char *)index + (24 * mi) + 4, sha1);
1373 return ntohl(*((uint32_t *)((char *)index + (24 * mi))));
1382 static int matches_pack_name(struct packed_git *p, const char *ig)
1384 const char *last_c, *c;
1386 if (!strcmp(p->pack_name, ig))
1389 for (c = p->pack_name, last_c = c; *c;)
1394 if (!strcmp(last_c, ig))
1400 static int find_pack_entry(const unsigned char *sha1, struct pack_entry *e, const char **ignore_packed)
1402 struct packed_git *p;
1403 unsigned long offset;
1405 prepare_packed_git();
1407 for (p = packed_git; p; p = p->next) {
1408 if (ignore_packed) {
1410 for (ig = ignore_packed; *ig; ig++)
1411 if (!matches_pack_name(p, *ig))
1416 offset = find_pack_entry_one(sha1, p);
1419 * We are about to tell the caller where they can
1420 * locate the requested object. We better make
1421 * sure the packfile is still here and can be
1422 * accessed before supplying that answer, as
1423 * it may have been deleted since the index
1426 if (p->pack_fd == -1 && open_packed_git(p)) {
1427 error("packfile %s cannot be accessed", p->pack_name);
1432 hashcpy(e->sha1, sha1);
1439 struct packed_git *find_sha1_pack(const unsigned char *sha1,
1440 struct packed_git *packs)
1442 struct packed_git *p;
1444 for (p = packs; p; p = p->next) {
1445 if (find_pack_entry_one(sha1, p))
1452 static int sha1_loose_object_info(const unsigned char *sha1, unsigned long *sizep)
1455 unsigned long mapsize, size;
1460 map = map_sha1_file(sha1, &mapsize);
1462 return error("unable to find %s", sha1_to_hex(sha1));
1463 if (unpack_sha1_header(&stream, map, mapsize, hdr, sizeof(hdr)) < 0)
1464 status = error("unable to unpack %s header",
1466 else if ((status = parse_sha1_header(hdr, &size)) < 0)
1467 status = error("unable to parse %s header", sha1_to_hex(sha1));
1470 inflateEnd(&stream);
1471 munmap(map, mapsize);
1475 int sha1_object_info(const unsigned char *sha1, unsigned long *sizep)
1477 struct pack_entry e;
1479 if (!find_pack_entry(sha1, &e, NULL)) {
1480 reprepare_packed_git();
1481 if (!find_pack_entry(sha1, &e, NULL))
1482 return sha1_loose_object_info(sha1, sizep);
1484 return packed_object_info(e.p, e.offset, sizep);
1487 static void *read_packed_sha1(const unsigned char *sha1,
1488 enum object_type *type, unsigned long *size)
1490 struct pack_entry e;
1492 if (!find_pack_entry(sha1, &e, NULL))
1495 return unpack_entry(e.p, e.offset, type, size);
1499 * This is meant to hold a *small* number of objects that you would
1500 * want read_sha1_file() to be able to return, but yet you do not want
1501 * to write them into the object store (e.g. a browse-only
1504 static struct cached_object {
1505 unsigned char sha1[20];
1506 enum object_type type;
1510 static int cached_object_nr, cached_object_alloc;
1512 static struct cached_object *find_cached_object(const unsigned char *sha1)
1515 struct cached_object *co = cached_objects;
1517 for (i = 0; i < cached_object_nr; i++, co++) {
1518 if (!hashcmp(co->sha1, sha1))
1524 int pretend_sha1_file(void *buf, unsigned long len, enum object_type type,
1525 unsigned char *sha1)
1527 struct cached_object *co;
1529 hash_sha1_file(buf, len, typename(type), sha1);
1530 if (has_sha1_file(sha1) || find_cached_object(sha1))
1532 if (cached_object_alloc <= cached_object_nr) {
1533 cached_object_alloc = alloc_nr(cached_object_alloc);
1534 cached_objects = xrealloc(cached_objects,
1535 sizeof(*cached_objects) *
1536 cached_object_alloc);
1538 co = &cached_objects[cached_object_nr++];
1541 co->buf = xmalloc(len);
1542 memcpy(co->buf, buf, len);
1543 hashcpy(co->sha1, sha1);
1547 void *read_sha1_file(const unsigned char *sha1, enum object_type *type,
1548 unsigned long *size)
1550 unsigned long mapsize;
1552 struct cached_object *co;
1554 co = find_cached_object(sha1);
1556 buf = xmalloc(co->size + 1);
1557 memcpy(buf, co->buf, co->size);
1558 ((char*)buf)[co->size] = 0;
1564 buf = read_packed_sha1(sha1, type, size);
1567 map = map_sha1_file(sha1, &mapsize);
1569 buf = unpack_sha1_file(map, mapsize, type, size, sha1);
1570 munmap(map, mapsize);
1573 reprepare_packed_git();
1574 return read_packed_sha1(sha1, type, size);
1577 void *read_object_with_reference(const unsigned char *sha1,
1578 const char *required_type_name,
1579 unsigned long *size,
1580 unsigned char *actual_sha1_return)
1582 enum object_type type, required_type;
1584 unsigned long isize;
1585 unsigned char actual_sha1[20];
1587 required_type = type_from_string(required_type_name);
1588 hashcpy(actual_sha1, sha1);
1590 int ref_length = -1;
1591 const char *ref_type = NULL;
1593 buffer = read_sha1_file(actual_sha1, &type, &isize);
1596 if (type == required_type) {
1598 if (actual_sha1_return)
1599 hashcpy(actual_sha1_return, actual_sha1);
1602 /* Handle references */
1603 else if (type == OBJ_COMMIT)
1605 else if (type == OBJ_TAG)
1606 ref_type = "object ";
1611 ref_length = strlen(ref_type);
1613 if (memcmp(buffer, ref_type, ref_length) ||
1614 get_sha1_hex((char *) buffer + ref_length, actual_sha1)) {
1619 /* Now we have the ID of the referred-to object in
1620 * actual_sha1. Check again. */
1624 static void write_sha1_file_prepare(void *buf, unsigned long len,
1625 const char *type, unsigned char *sha1,
1626 char *hdr, int *hdrlen)
1630 /* Generate the header */
1631 *hdrlen = sprintf(hdr, "%s %lu", type, len)+1;
1635 SHA1_Update(&c, hdr, *hdrlen);
1636 SHA1_Update(&c, buf, len);
1637 SHA1_Final(sha1, &c);
1641 * Link the tempfile to the final place, possibly creating the
1642 * last directory level as you do so.
1644 * Returns the errno on failure, 0 on success.
1646 static int link_temp_to_file(const char *tmpfile, const char *filename)
1651 if (!link(tmpfile, filename))
1655 * Try to mkdir the last path component if that failed.
1657 * Re-try the "link()" regardless of whether the mkdir
1658 * succeeds, since a race might mean that somebody
1662 dir = strrchr(filename, '/');
1665 if (!mkdir(filename, 0777) && adjust_shared_perm(filename)) {
1670 if (!link(tmpfile, filename))
1678 * Move the just written object into its final resting place
1680 int move_temp_to_file(const char *tmpfile, const char *filename)
1682 int ret = link_temp_to_file(tmpfile, filename);
1685 * Coda hack - coda doesn't like cross-directory links,
1686 * so we fall back to a rename, which will mean that it
1687 * won't be able to check collisions, but that's not a
1690 * The same holds for FAT formatted media.
1692 * When this succeeds, we just return 0. We have nothing
1695 if (ret && ret != EEXIST) {
1696 if (!rename(tmpfile, filename))
1702 if (ret != EEXIST) {
1703 return error("unable to write sha1 filename %s: %s\n", filename, strerror(ret));
1705 /* FIXME!!! Collision check here ? */
1711 static int write_buffer(int fd, const void *buf, size_t len)
1713 if (write_in_full(fd, buf, len) < 0)
1714 return error("file write error (%s)", strerror(errno));
1718 static int write_binary_header(unsigned char *hdr, enum object_type type, unsigned long len)
1723 c = (type << 4) | (len & 15);
1736 static void setup_object_header(z_stream *stream, const char *type, unsigned long len)
1738 int obj_type, hdrlen;
1740 if (use_legacy_headers) {
1741 while (deflate(stream, 0) == Z_OK)
1745 obj_type = type_from_string(type);
1746 hdrlen = write_binary_header(stream->next_out, obj_type, len);
1747 stream->total_out = hdrlen;
1748 stream->next_out += hdrlen;
1749 stream->avail_out -= hdrlen;
1752 int hash_sha1_file(void *buf, unsigned long len, const char *type,
1753 unsigned char *sha1)
1757 write_sha1_file_prepare(buf, len, type, sha1, hdr, &hdrlen);
1761 int write_sha1_file(void *buf, unsigned long len, const char *type, unsigned char *returnsha1)
1764 unsigned char *compressed;
1766 unsigned char sha1[20];
1768 static char tmpfile[PATH_MAX];
1772 /* Normally if we have it in the pack then we do not bother writing
1773 * it out into .git/objects/??/?{38} file.
1775 write_sha1_file_prepare(buf, len, type, sha1, hdr, &hdrlen);
1776 filename = sha1_file_name(sha1);
1778 hashcpy(returnsha1, sha1);
1779 if (has_sha1_file(sha1))
1781 fd = open(filename, O_RDONLY);
1784 * FIXME!!! We might do collision checking here, but we'd
1785 * need to uncompress the old file and check it. Later.
1791 if (errno != ENOENT) {
1792 return error("sha1 file %s: %s\n", filename, strerror(errno));
1795 snprintf(tmpfile, sizeof(tmpfile), "%s/obj_XXXXXX", get_object_directory());
1797 fd = mkstemp(tmpfile);
1800 return error("insufficient permission for adding an object to repository database %s\n", get_object_directory());
1802 return error("unable to create temporary sha1 filename %s: %s\n", tmpfile, strerror(errno));
1806 memset(&stream, 0, sizeof(stream));
1807 deflateInit(&stream, zlib_compression_level);
1808 size = 8 + deflateBound(&stream, len+hdrlen);
1809 compressed = xmalloc(size);
1812 stream.next_out = compressed;
1813 stream.avail_out = size;
1815 /* First header.. */
1816 stream.next_in = (unsigned char *)hdr;
1817 stream.avail_in = hdrlen;
1818 setup_object_header(&stream, type, len);
1820 /* Then the data itself.. */
1821 stream.next_in = buf;
1822 stream.avail_in = len;
1823 while (deflate(&stream, Z_FINISH) == Z_OK)
1825 deflateEnd(&stream);
1826 size = stream.total_out;
1828 if (write_buffer(fd, compressed, size) < 0)
1829 die("unable to write sha1 file");
1834 return move_temp_to_file(tmpfile, filename);
1838 * We need to unpack and recompress the object for writing
1839 * it out to a different file.
1841 static void *repack_object(const unsigned char *sha1, unsigned long *objsize)
1845 unsigned char *unpacked;
1847 enum object_type type;
1852 /* need to unpack and recompress it by itself */
1853 unpacked = read_packed_sha1(sha1, &type, &len);
1855 error("cannot read sha1_file for %s", sha1_to_hex(sha1));
1857 hdrlen = sprintf(hdr, "%s %lu", typename(type), len) + 1;
1860 memset(&stream, 0, sizeof(stream));
1861 deflateInit(&stream, zlib_compression_level);
1862 size = deflateBound(&stream, len + hdrlen);
1863 buf = xmalloc(size);
1866 stream.next_out = buf;
1867 stream.avail_out = size;
1869 /* First header.. */
1870 stream.next_in = (void *)hdr;
1871 stream.avail_in = hdrlen;
1872 while (deflate(&stream, 0) == Z_OK)
1875 /* Then the data itself.. */
1876 stream.next_in = unpacked;
1877 stream.avail_in = len;
1878 while (deflate(&stream, Z_FINISH) == Z_OK)
1880 deflateEnd(&stream);
1883 *objsize = stream.total_out;
1887 int write_sha1_to_fd(int fd, const unsigned char *sha1)
1890 unsigned long objsize;
1891 void *buf = map_sha1_file(sha1, &objsize);
1894 retval = write_buffer(fd, buf, objsize);
1895 munmap(buf, objsize);
1899 buf = repack_object(sha1, &objsize);
1900 retval = write_buffer(fd, buf, objsize);
1905 int write_sha1_from_fd(const unsigned char *sha1, int fd, char *buffer,
1906 size_t bufsize, size_t *bufposn)
1908 char tmpfile[PATH_MAX];
1911 unsigned char real_sha1[20];
1912 unsigned char discard[4096];
1916 snprintf(tmpfile, sizeof(tmpfile), "%s/obj_XXXXXX", get_object_directory());
1918 local = mkstemp(tmpfile);
1921 return error("insufficient permission for adding an object to repository database %s\n", get_object_directory());
1923 return error("unable to create temporary sha1 filename %s: %s\n", tmpfile, strerror(errno));
1926 memset(&stream, 0, sizeof(stream));
1928 inflateInit(&stream);
1935 stream.avail_in = *bufposn;
1936 stream.next_in = (unsigned char *) buffer;
1938 stream.next_out = discard;
1939 stream.avail_out = sizeof(discard);
1940 ret = inflate(&stream, Z_SYNC_FLUSH);
1941 SHA1_Update(&c, discard, sizeof(discard) -
1943 } while (stream.avail_in && ret == Z_OK);
1944 if (write_buffer(local, buffer, *bufposn - stream.avail_in) < 0)
1945 die("unable to write sha1 file");
1946 memmove(buffer, buffer + *bufposn - stream.avail_in,
1948 *bufposn = stream.avail_in;
1952 size = xread(fd, buffer + *bufposn, bufsize - *bufposn);
1957 return error("Connection closed?");
1958 perror("Reading from connection");
1963 inflateEnd(&stream);
1966 SHA1_Final(real_sha1, &c);
1967 if (ret != Z_STREAM_END) {
1969 return error("File %s corrupted", sha1_to_hex(sha1));
1971 if (hashcmp(sha1, real_sha1)) {
1973 return error("File %s has bad hash", sha1_to_hex(sha1));
1976 return move_temp_to_file(tmpfile, sha1_file_name(sha1));
1979 int has_pack_index(const unsigned char *sha1)
1982 if (stat(sha1_pack_index_name(sha1), &st))
1987 int has_pack_file(const unsigned char *sha1)
1990 if (stat(sha1_pack_name(sha1), &st))
1995 int has_sha1_pack(const unsigned char *sha1, const char **ignore_packed)
1997 struct pack_entry e;
1998 return find_pack_entry(sha1, &e, ignore_packed);
2001 int has_sha1_file(const unsigned char *sha1)
2004 struct pack_entry e;
2006 if (find_pack_entry(sha1, &e, NULL))
2008 return find_sha1_file(sha1, &st) ? 1 : 0;
2012 * reads from fd as long as possible into a supplied buffer of size bytes.
2013 * If necessary the buffer's size is increased using realloc()
2015 * returns 0 if anything went fine and -1 otherwise
2017 * NOTE: both buf and size may change, but even when -1 is returned
2018 * you still have to free() it yourself.
2020 int read_pipe(int fd, char** return_buf, unsigned long* return_size)
2022 char* buf = *return_buf;
2023 unsigned long size = *return_size;
2025 unsigned long off = 0;
2028 iret = xread(fd, buf + off, size - off);
2033 buf = xrealloc(buf, size);
2046 int index_pipe(unsigned char *sha1, int fd, const char *type, int write_object)
2048 unsigned long size = 4096;
2049 char *buf = xmalloc(size);
2052 if (read_pipe(fd, &buf, &size)) {
2060 ret = write_sha1_file(buf, size, type, sha1);
2062 ret = hash_sha1_file(buf, size, type, sha1);
2067 int index_fd(unsigned char *sha1, int fd, struct stat *st, int write_object,
2068 enum object_type type, const char *path)
2070 unsigned long size = st->st_size;
2072 int ret, re_allocated = 0;
2076 buf = xmmap(NULL, size, PROT_READ, MAP_PRIVATE, fd, 0);
2083 * Convert blobs to git internal format
2085 if ((type == OBJ_BLOB) && S_ISREG(st->st_mode)) {
2086 unsigned long nsize = size;
2088 if (convert_to_git(path, &nbuf, &nsize)) {
2098 ret = write_sha1_file(buf, size, typename(type), sha1);
2100 ret = hash_sha1_file(buf, size, typename(type), sha1);
2110 int index_path(unsigned char *sha1, const char *path, struct stat *st, int write_object)
2115 switch (st->st_mode & S_IFMT) {
2117 fd = open(path, O_RDONLY);
2119 return error("open(\"%s\"): %s", path,
2121 if (index_fd(sha1, fd, st, write_object, OBJ_BLOB, path) < 0)
2122 return error("%s: failed to insert into database",
2126 target = xmalloc(st->st_size+1);
2127 if (readlink(path, target, st->st_size+1) != st->st_size) {
2128 char *errstr = strerror(errno);
2130 return error("readlink(\"%s\"): %s", path,
2134 hash_sha1_file(target, st->st_size, blob_type, sha1);
2135 else if (write_sha1_file(target, st->st_size, blob_type, sha1))
2136 return error("%s: failed to insert into database",
2141 return error("%s: unsupported file type", path);
2146 int read_pack_header(int fd, struct pack_header *header)
2148 char *c = (char*)header;
2149 ssize_t remaining = sizeof(struct pack_header);
2151 ssize_t r = xread(fd, c, remaining);
2153 /* "eof before pack header was fully read" */
2154 return PH_ERROR_EOF;
2157 } while (remaining > 0);
2158 if (header->hdr_signature != htonl(PACK_SIGNATURE))
2159 /* "protocol error (pack signature mismatch detected)" */
2160 return PH_ERROR_PACK_SIGNATURE;
2161 if (!pack_version_ok(header->hdr_version))
2162 /* "protocol error (pack version unsupported)" */
2163 return PH_ERROR_PROTOCOL;