2 * GIT - The information manager from hell
4 * Copyright (C) Linus Torvalds, 2005
6 * This handles basic git sha1 object files - packing, unpacking,
18 #if defined(__linux__) && (defined(__i386__) || defined(__PPC__))
19 #define O_NOATIME 01000000
31 const unsigned char null_sha1[20];
33 static unsigned int sha1_file_open_flag = O_NOATIME;
35 signed char hexval_table[256] = {
36 -1, -1, -1, -1, -1, -1, -1, -1, /* 00-07 */
37 -1, -1, -1, -1, -1, -1, -1, -1, /* 08-0f */
38 -1, -1, -1, -1, -1, -1, -1, -1, /* 10-17 */
39 -1, -1, -1, -1, -1, -1, -1, -1, /* 18-1f */
40 -1, -1, -1, -1, -1, -1, -1, -1, /* 20-27 */
41 -1, -1, -1, -1, -1, -1, -1, -1, /* 28-2f */
42 0, 1, 2, 3, 4, 5, 6, 7, /* 30-37 */
43 8, 9, -1, -1, -1, -1, -1, -1, /* 38-3f */
44 -1, 10, 11, 12, 13, 14, 15, -1, /* 40-47 */
45 -1, -1, -1, -1, -1, -1, -1, -1, /* 48-4f */
46 -1, -1, -1, -1, -1, -1, -1, -1, /* 50-57 */
47 -1, -1, -1, -1, -1, -1, -1, -1, /* 58-5f */
48 -1, 10, 11, 12, 13, 14, 15, -1, /* 60-67 */
49 -1, -1, -1, -1, -1, -1, -1, -1, /* 68-67 */
50 -1, -1, -1, -1, -1, -1, -1, -1, /* 70-77 */
51 -1, -1, -1, -1, -1, -1, -1, -1, /* 78-7f */
52 -1, -1, -1, -1, -1, -1, -1, -1, /* 80-87 */
53 -1, -1, -1, -1, -1, -1, -1, -1, /* 88-8f */
54 -1, -1, -1, -1, -1, -1, -1, -1, /* 90-97 */
55 -1, -1, -1, -1, -1, -1, -1, -1, /* 98-9f */
56 -1, -1, -1, -1, -1, -1, -1, -1, /* a0-a7 */
57 -1, -1, -1, -1, -1, -1, -1, -1, /* a8-af */
58 -1, -1, -1, -1, -1, -1, -1, -1, /* b0-b7 */
59 -1, -1, -1, -1, -1, -1, -1, -1, /* b8-bf */
60 -1, -1, -1, -1, -1, -1, -1, -1, /* c0-c7 */
61 -1, -1, -1, -1, -1, -1, -1, -1, /* c8-cf */
62 -1, -1, -1, -1, -1, -1, -1, -1, /* d0-d7 */
63 -1, -1, -1, -1, -1, -1, -1, -1, /* d8-df */
64 -1, -1, -1, -1, -1, -1, -1, -1, /* e0-e7 */
65 -1, -1, -1, -1, -1, -1, -1, -1, /* e8-ef */
66 -1, -1, -1, -1, -1, -1, -1, -1, /* f0-f7 */
67 -1, -1, -1, -1, -1, -1, -1, -1, /* f8-ff */
70 int get_sha1_hex(const char *hex, unsigned char *sha1)
73 for (i = 0; i < 20; i++) {
74 unsigned int val = (hexval(hex[0]) << 4) | hexval(hex[1]);
83 int safe_create_leading_directories(char *path)
92 pos = strchr(pos, '/');
96 if (!stat(path, &st)) {
98 if (!S_ISDIR(st.st_mode)) {
103 else if (mkdir(path, 0777)) {
107 else if (adjust_shared_perm(path)) {
116 char * sha1_to_hex(const unsigned char *sha1)
119 static char hexbuffer[4][50];
120 static const char hex[] = "0123456789abcdef";
121 char *buffer = hexbuffer[3 & ++bufno], *buf = buffer;
124 for (i = 0; i < 20; i++) {
125 unsigned int val = *sha1++;
126 *buf++ = hex[val >> 4];
127 *buf++ = hex[val & 0xf];
134 static void fill_sha1_path(char *pathbuf, const unsigned char *sha1)
137 for (i = 0; i < 20; i++) {
138 static char hex[] = "0123456789abcdef";
139 unsigned int val = sha1[i];
140 char *pos = pathbuf + i*2 + (i > 0);
141 *pos++ = hex[val >> 4];
142 *pos = hex[val & 0xf];
147 * NOTE! This returns a statically allocated buffer, so you have to be
148 * careful about using it. Do a "xstrdup()" if you need to save the
151 * Also note that this returns the location for creating. Reading
152 * SHA1 file can happen from any alternate directory listed in the
153 * DB_ENVIRONMENT environment variable if it is not found in
154 * the primary object database.
156 char *sha1_file_name(const unsigned char *sha1)
158 static char *name, *base;
161 const char *sha1_file_directory = get_object_directory();
162 int len = strlen(sha1_file_directory);
163 base = xmalloc(len + 60);
164 memcpy(base, sha1_file_directory, len);
165 memset(base+len, 0, 60);
168 name = base + len + 1;
170 fill_sha1_path(name, sha1);
174 char *sha1_pack_name(const unsigned char *sha1)
176 static const char hex[] = "0123456789abcdef";
177 static char *name, *base, *buf;
181 const char *sha1_file_directory = get_object_directory();
182 int len = strlen(sha1_file_directory);
183 base = xmalloc(len + 60);
184 sprintf(base, "%s/pack/pack-1234567890123456789012345678901234567890.pack", sha1_file_directory);
185 name = base + len + 11;
190 for (i = 0; i < 20; i++) {
191 unsigned int val = *sha1++;
192 *buf++ = hex[val >> 4];
193 *buf++ = hex[val & 0xf];
199 char *sha1_pack_index_name(const unsigned char *sha1)
201 static const char hex[] = "0123456789abcdef";
202 static char *name, *base, *buf;
206 const char *sha1_file_directory = get_object_directory();
207 int len = strlen(sha1_file_directory);
208 base = xmalloc(len + 60);
209 sprintf(base, "%s/pack/pack-1234567890123456789012345678901234567890.idx", sha1_file_directory);
210 name = base + len + 11;
215 for (i = 0; i < 20; i++) {
216 unsigned int val = *sha1++;
217 *buf++ = hex[val >> 4];
218 *buf++ = hex[val & 0xf];
224 struct alternate_object_database *alt_odb_list;
225 static struct alternate_object_database **alt_odb_tail;
227 static void read_info_alternates(const char * alternates, int depth);
230 * Prepare alternate object database registry.
232 * The variable alt_odb_list points at the list of struct
233 * alternate_object_database. The elements on this list come from
234 * non-empty elements from colon separated ALTERNATE_DB_ENVIRONMENT
235 * environment variable, and $GIT_OBJECT_DIRECTORY/info/alternates,
236 * whose contents is similar to that environment variable but can be
237 * LF separated. Its base points at a statically allocated buffer that
238 * contains "/the/directory/corresponding/to/.git/objects/...", while
239 * its name points just after the slash at the end of ".git/objects/"
240 * in the example above, and has enough space to hold 40-byte hex
241 * SHA1, an extra slash for the first level indirection, and the
244 static int link_alt_odb_entry(const char * entry, int len, const char * relative_base, int depth)
247 const char *objdir = get_object_directory();
248 struct alternate_object_database *ent;
249 struct alternate_object_database *alt;
250 /* 43 = 40-byte + 2 '/' + terminating NUL */
252 int entlen = pfxlen + 43;
255 if (*entry != '/' && relative_base) {
256 /* Relative alt-odb */
258 base_len = strlen(relative_base) + 1;
262 ent = xmalloc(sizeof(*ent) + entlen);
264 if (*entry != '/' && relative_base) {
265 memcpy(ent->base, relative_base, base_len - 1);
266 ent->base[base_len - 1] = '/';
267 memcpy(ent->base + base_len, entry, len);
270 memcpy(ent->base, entry, pfxlen);
272 ent->name = ent->base + pfxlen + 1;
273 ent->base[pfxlen + 3] = '/';
274 ent->base[pfxlen] = ent->base[entlen-1] = 0;
276 /* Detect cases where alternate disappeared */
277 if (stat(ent->base, &st) || !S_ISDIR(st.st_mode)) {
278 error("object directory %s does not exist; "
279 "check .git/objects/info/alternates.",
285 /* Prevent the common mistake of listing the same
286 * thing twice, or object directory itself.
288 for (alt = alt_odb_list; alt; alt = alt->next) {
289 if (!memcmp(ent->base, alt->base, pfxlen)) {
294 if (!memcmp(ent->base, objdir, pfxlen)) {
299 /* add the alternate entry */
301 alt_odb_tail = &(ent->next);
304 /* recursively add alternates */
305 read_info_alternates(ent->base, depth + 1);
307 ent->base[pfxlen] = '/';
312 static void link_alt_odb_entries(const char *alt, const char *ep, int sep,
313 const char *relative_base, int depth)
315 const char *cp, *last;
318 error("%s: ignoring alternate object stores, nesting too deep.",
326 if (cp < ep && *cp == '#') {
327 while (cp < ep && *cp != sep)
332 while (cp < ep && *cp != sep)
335 if ((*last != '/') && depth) {
336 error("%s: ignoring relative alternate object store %s",
337 relative_base, last);
339 link_alt_odb_entry(last, cp - last,
340 relative_base, depth);
343 while (cp < ep && *cp == sep)
349 static void read_info_alternates(const char * relative_base, int depth)
356 sprintf(path, "%s/info/alternates", relative_base);
357 fd = open(path, O_RDONLY);
360 if (fstat(fd, &st) || (st.st_size == 0)) {
364 map = xmmap(NULL, st.st_size, PROT_READ, MAP_PRIVATE, fd, 0);
367 link_alt_odb_entries(map, map + st.st_size, '\n', relative_base, depth);
369 munmap(map, st.st_size);
372 void prepare_alt_odb(void)
376 alt = getenv(ALTERNATE_DB_ENVIRONMENT);
381 alt_odb_tail = &alt_odb_list;
382 link_alt_odb_entries(alt, alt + strlen(alt), ':', NULL, 0);
384 read_info_alternates(get_object_directory(), 0);
387 static char *find_sha1_file(const unsigned char *sha1, struct stat *st)
389 char *name = sha1_file_name(sha1);
390 struct alternate_object_database *alt;
395 for (alt = alt_odb_list; alt; alt = alt->next) {
397 fill_sha1_path(name, sha1);
398 if (!stat(alt->base, st))
404 static unsigned int pack_used_ctr;
405 static unsigned int pack_mmap_calls;
406 static unsigned int peak_pack_open_windows;
407 static unsigned int pack_open_windows;
408 static size_t peak_pack_mapped;
409 static size_t pack_mapped;
410 static size_t page_size;
411 struct packed_git *packed_git;
416 "pack_report: getpagesize() = %10" SZ_FMT "\n"
417 "pack_report: core.packedGitWindowSize = %10" SZ_FMT "\n"
418 "pack_report: core.packedGitLimit = %10" SZ_FMT "\n",
420 packed_git_window_size,
423 "pack_report: pack_used_ctr = %10u\n"
424 "pack_report: pack_mmap_calls = %10u\n"
425 "pack_report: pack_open_windows = %10u / %10u\n"
426 "pack_report: pack_mapped = "
427 "%10" SZ_FMT " / %10" SZ_FMT "\n",
430 pack_open_windows, peak_pack_open_windows,
431 pack_mapped, peak_pack_mapped);
434 static int check_packed_git_idx(const char *path, unsigned long *idx_size_,
439 unsigned long idx_size;
441 int fd = open(path, O_RDONLY);
445 if (fstat(fd, &st)) {
449 idx_size = st.st_size;
450 idx_map = xmmap(NULL, idx_size, PROT_READ, MAP_PRIVATE, fd, 0);
455 *idx_size_ = idx_size;
457 /* check index map */
458 if (idx_size < 4*256 + 20 + 20)
459 return error("index file %s is too small", path);
461 /* a future index format would start with this, as older git
462 * binaries would fail the non-monotonic index check below.
463 * give a nicer warning to the user if we can.
465 if (index[0] == htonl(PACK_IDX_SIGNATURE))
466 return error("index file %s is a newer version"
467 " and is not supported by this binary"
468 " (try upgrading GIT to a newer version)",
472 for (i = 0; i < 256; i++) {
473 unsigned int n = ntohl(index[i]);
475 return error("non-monotonic index %s", path);
481 * - 256 index entries 4 bytes each
482 * - 24-byte entries * nr (20-byte sha1 + 4-byte offset)
483 * - 20-byte SHA1 of the packfile
484 * - 20-byte SHA1 file checksum
486 if (idx_size != 4*256 + nr * 24 + 20 + 20)
487 return error("wrong index file size in %s", path);
492 static void scan_windows(struct packed_git *p,
493 struct packed_git **lru_p,
494 struct pack_window **lru_w,
495 struct pack_window **lru_l)
497 struct pack_window *w, *w_l;
499 for (w_l = NULL, w = p->windows; w; w = w->next) {
501 if (!*lru_w || w->last_used < (*lru_w)->last_used) {
511 static int unuse_one_window(struct packed_git *current)
513 struct packed_git *p, *lru_p = NULL;
514 struct pack_window *lru_w = NULL, *lru_l = NULL;
517 scan_windows(current, &lru_p, &lru_w, &lru_l);
518 for (p = packed_git; p; p = p->next)
519 scan_windows(p, &lru_p, &lru_w, &lru_l);
521 munmap(lru_w->base, lru_w->len);
522 pack_mapped -= lru_w->len;
524 lru_l->next = lru_w->next;
526 lru_p->windows = lru_w->next;
527 if (!lru_p->windows && lru_p != current) {
528 close(lru_p->pack_fd);
539 void release_pack_memory(size_t need)
541 size_t cur = pack_mapped;
542 while (need >= (cur - pack_mapped) && unuse_one_window(NULL))
546 void unuse_pack(struct pack_window **w_cursor)
548 struct pack_window *w = *w_cursor;
555 static int open_packed_git(struct packed_git *p)
558 struct pack_header hdr;
559 unsigned char sha1[20];
560 unsigned char *idx_sha1;
563 p->pack_fd = open(p->pack_name, O_RDONLY);
564 if (p->pack_fd < 0 || fstat(p->pack_fd, &st))
567 /* If we created the struct before we had the pack we lack size. */
569 if (!S_ISREG(st.st_mode))
570 return error("packfile %s not a regular file", p->pack_name);
571 p->pack_size = st.st_size;
572 } else if (p->pack_size != st.st_size)
573 return error("packfile %s size changed", p->pack_name);
575 /* We leave these file descriptors open with sliding mmap;
576 * there is no point keeping them open across exec(), though.
578 fd_flag = fcntl(p->pack_fd, F_GETFD, 0);
580 return error("cannot determine file descriptor flags");
581 fd_flag |= FD_CLOEXEC;
582 if (fcntl(p->pack_fd, F_SETFD, fd_flag) == -1)
583 return error("cannot set FD_CLOEXEC");
585 /* Verify we recognize this pack file format. */
586 if (read_in_full(p->pack_fd, &hdr, sizeof(hdr)) != sizeof(hdr))
587 return error("file %s is far too short to be a packfile", p->pack_name);
588 if (hdr.hdr_signature != htonl(PACK_SIGNATURE))
589 return error("file %s is not a GIT packfile", p->pack_name);
590 if (!pack_version_ok(hdr.hdr_version))
591 return error("packfile %s is version %u and not supported"
592 " (try upgrading GIT to a newer version)",
593 p->pack_name, ntohl(hdr.hdr_version));
595 /* Verify the pack matches its index. */
596 if (num_packed_objects(p) != ntohl(hdr.hdr_entries))
597 return error("packfile %s claims to have %u objects"
598 " while index size indicates %u objects",
599 p->pack_name, ntohl(hdr.hdr_entries),
600 num_packed_objects(p));
601 if (lseek(p->pack_fd, p->pack_size - sizeof(sha1), SEEK_SET) == -1)
602 return error("end of packfile %s is unavailable", p->pack_name);
603 if (read_in_full(p->pack_fd, sha1, sizeof(sha1)) != sizeof(sha1))
604 return error("packfile %s signature is unavailable", p->pack_name);
605 idx_sha1 = ((unsigned char *)p->index_base) + p->index_size - 40;
606 if (hashcmp(sha1, idx_sha1))
607 return error("packfile %s does not match index", p->pack_name);
611 static int in_window(struct pack_window *win, unsigned long offset)
613 /* We must promise at least 20 bytes (one hash) after the
614 * offset is available from this window, otherwise the offset
615 * is not actually in this window and a different window (which
616 * has that one hash excess) must be used. This is to support
617 * the object header and delta base parsing routines below.
619 off_t win_off = win->offset;
620 return win_off <= offset
621 && (offset + 20) <= (win_off + win->len);
624 unsigned char* use_pack(struct packed_git *p,
625 struct pack_window **w_cursor,
626 unsigned long offset,
629 struct pack_window *win = *w_cursor;
631 if (p->pack_fd == -1 && open_packed_git(p))
632 die("packfile %s cannot be accessed", p->pack_name);
634 /* Since packfiles end in a hash of their content and its
635 * pointless to ask for an offset into the middle of that
636 * hash, and the in_window function above wouldn't match
637 * don't allow an offset too close to the end of the file.
639 if (offset > (p->pack_size - 20))
640 die("offset beyond end of packfile (truncated pack?)");
642 if (!win || !in_window(win, offset)) {
645 for (win = p->windows; win; win = win->next) {
646 if (in_window(win, offset))
651 page_size = getpagesize();
652 win = xcalloc(1, sizeof(*win));
653 win->offset = (offset / page_size) * page_size;
654 win->len = p->pack_size - win->offset;
655 if (win->len > packed_git_window_size)
656 win->len = packed_git_window_size;
657 pack_mapped += win->len;
658 while (packed_git_limit < pack_mapped
659 && unuse_one_window(p))
661 win->base = xmmap(NULL, win->len,
662 PROT_READ, MAP_PRIVATE,
663 p->pack_fd, win->offset);
664 if (win->base == MAP_FAILED)
665 die("packfile %s cannot be mapped: %s",
670 if (pack_mapped > peak_pack_mapped)
671 peak_pack_mapped = pack_mapped;
672 if (pack_open_windows > peak_pack_open_windows)
673 peak_pack_open_windows = pack_open_windows;
674 win->next = p->windows;
678 if (win != *w_cursor) {
679 win->last_used = pack_used_ctr++;
683 offset -= win->offset;
685 *left = win->len - offset;
686 return win->base + offset;
689 struct packed_git *add_packed_git(char *path, int path_len, int local)
692 struct packed_git *p;
693 unsigned long idx_size;
695 unsigned char sha1[20];
697 if (check_packed_git_idx(path, &idx_size, &idx_map))
700 /* do we have a corresponding .pack file? */
701 strcpy(path + path_len - 4, ".pack");
702 if (stat(path, &st) || !S_ISREG(st.st_mode)) {
703 munmap(idx_map, idx_size);
706 /* ok, it looks sane as far as we can check without
707 * actually mapping the pack file.
709 p = xmalloc(sizeof(*p) + path_len + 2);
710 strcpy(p->pack_name, path);
711 p->index_size = idx_size;
712 p->pack_size = st.st_size;
713 p->index_base = idx_map;
717 p->pack_local = local;
718 if ((path_len > 44) && !get_sha1_hex(path + path_len - 44, sha1))
719 hashcpy(p->sha1, sha1);
723 struct packed_git *parse_pack_index(unsigned char *sha1)
725 char *path = sha1_pack_index_name(sha1);
726 return parse_pack_index_file(sha1, path);
729 struct packed_git *parse_pack_index_file(const unsigned char *sha1, char *idx_path)
731 struct packed_git *p;
732 unsigned long idx_size;
736 if (check_packed_git_idx(idx_path, &idx_size, &idx_map))
739 path = sha1_pack_name(sha1);
741 p = xmalloc(sizeof(*p) + strlen(path) + 2);
742 strcpy(p->pack_name, path);
743 p->index_size = idx_size;
745 p->index_base = idx_map;
749 hashcpy(p->sha1, sha1);
753 void install_packed_git(struct packed_git *pack)
755 pack->next = packed_git;
759 static void prepare_packed_git_one(char *objdir, int local)
766 sprintf(path, "%s/pack", objdir);
771 error("unable to open object pack directory: %s: %s",
772 path, strerror(errno));
776 while ((de = readdir(dir)) != NULL) {
777 int namelen = strlen(de->d_name);
778 struct packed_git *p;
780 if (!has_extension(de->d_name, ".idx"))
783 /* Don't reopen a pack we already have. */
784 strcpy(path + len, de->d_name);
785 for (p = packed_git; p; p = p->next) {
786 if (!memcmp(path, p->pack_name, len + namelen - 4))
791 /* See if it really is a valid .idx file with corresponding
792 * .pack file that we can map.
794 p = add_packed_git(path, len + namelen, local);
797 install_packed_git(p);
802 static int prepare_packed_git_run_once = 0;
803 void prepare_packed_git(void)
805 struct alternate_object_database *alt;
807 if (prepare_packed_git_run_once)
809 prepare_packed_git_one(get_object_directory(), 1);
811 for (alt = alt_odb_list; alt; alt = alt->next) {
813 prepare_packed_git_one(alt->base, 0);
816 prepare_packed_git_run_once = 1;
819 void reprepare_packed_git(void)
821 prepare_packed_git_run_once = 0;
822 prepare_packed_git();
825 int check_sha1_signature(const unsigned char *sha1, void *map, unsigned long size, const char *type)
827 unsigned char real_sha1[20];
828 hash_sha1_file(map, size, type, real_sha1);
829 return hashcmp(sha1, real_sha1) ? -1 : 0;
832 void *map_sha1_file(const unsigned char *sha1, unsigned long *size)
837 char *filename = find_sha1_file(sha1, &st);
843 fd = open(filename, O_RDONLY | sha1_file_open_flag);
845 /* See if it works without O_NOATIME */
846 switch (sha1_file_open_flag) {
848 fd = open(filename, O_RDONLY);
856 /* If it failed once, it will probably fail again.
857 * Stop using O_NOATIME
859 sha1_file_open_flag = 0;
861 map = xmmap(NULL, st.st_size, PROT_READ, MAP_PRIVATE, fd, 0);
867 int legacy_loose_object(unsigned char *map)
872 * Is it a zlib-compressed buffer? If so, the first byte
873 * must be 0x78 (15-bit window size, deflated), and the
874 * first 16-bit word is evenly divisible by 31
876 word = (map[0] << 8) + map[1];
877 if (map[0] == 0x78 && !(word % 31))
883 unsigned long unpack_object_header_gently(const unsigned char *buf, unsigned long len, enum object_type *type, unsigned long *sizep)
888 unsigned long used = 0;
891 *type = (c >> 4) & 7;
897 if (sizeof(long) * 8 <= shift)
900 size += (c & 0x7f) << shift;
907 static int unpack_sha1_header(z_stream *stream, unsigned char *map, unsigned long mapsize, void *buffer, unsigned long bufsiz)
909 unsigned long size, used;
910 static const char valid_loose_object_type[8] = {
912 1, 1, 1, 1, /* "commit", "tree", "blob", "tag" */
913 0, /* "delta" and others are invalid in a loose object */
915 enum object_type type;
917 /* Get the data stream */
918 memset(stream, 0, sizeof(*stream));
919 stream->next_in = map;
920 stream->avail_in = mapsize;
921 stream->next_out = buffer;
922 stream->avail_out = bufsiz;
924 if (legacy_loose_object(map)) {
926 return inflate(stream, 0);
929 used = unpack_object_header_gently(map, mapsize, &type, &size);
930 if (!used || !valid_loose_object_type[type])
935 /* Set up the stream for the rest.. */
936 stream->next_in = map;
937 stream->avail_in = mapsize;
940 /* And generate the fake traditional header */
941 stream->total_out = 1 + snprintf(buffer, bufsiz, "%s %lu",
942 type_names[type], size);
946 static void *unpack_sha1_rest(z_stream *stream, void *buffer, unsigned long size)
948 int bytes = strlen(buffer) + 1;
949 unsigned char *buf = xmalloc(1+size);
952 n = stream->total_out - bytes;
955 memcpy(buf, (char *) buffer + bytes, n);
958 stream->next_out = buf + bytes;
959 stream->avail_out = size - bytes;
960 while (inflate(stream, Z_FINISH) == Z_OK)
969 * We used to just use "sscanf()", but that's actually way
970 * too permissive for what we want to check. So do an anal
971 * object header parse by hand.
973 static int parse_sha1_header(char *hdr, char *type, unsigned long *sizep)
979 * The type can be at most ten bytes (including the
980 * terminating '\0' that we add), and is followed by
995 * The length must follow immediately, and be in canonical
996 * decimal format (ie "010" is not valid).
1003 unsigned long c = *hdr - '0';
1007 size = size * 10 + c;
1013 * The length must be followed by a zero byte
1015 return *hdr ? -1 : 0;
1018 void * unpack_sha1_file(void *map, unsigned long mapsize, char *type, unsigned long *size)
1024 ret = unpack_sha1_header(&stream, map, mapsize, hdr, sizeof(hdr));
1025 if (ret < Z_OK || parse_sha1_header(hdr, type, size) < 0)
1028 return unpack_sha1_rest(&stream, hdr, *size);
1031 static unsigned long get_delta_base(struct packed_git *p,
1032 struct pack_window **w_curs,
1033 unsigned long offset,
1034 enum object_type kind,
1035 unsigned long delta_obj_offset,
1036 unsigned long *base_obj_offset)
1038 unsigned char *base_info = use_pack(p, w_curs, offset, NULL);
1039 unsigned long base_offset;
1041 /* use_pack() assured us we have [base_info, base_info + 20)
1042 * as a range that we can look at without walking off the
1043 * end of the mapped window. Its actually the hash size
1044 * that is assured. An OFS_DELTA longer than the hash size
1045 * is stupid, as then a REF_DELTA would be smaller to store.
1047 if (kind == OBJ_OFS_DELTA) {
1049 unsigned char c = base_info[used++];
1050 base_offset = c & 127;
1053 if (!base_offset || base_offset & ~(~0UL >> 7))
1054 die("offset value overflow for delta base object");
1055 c = base_info[used++];
1056 base_offset = (base_offset << 7) + (c & 127);
1058 base_offset = delta_obj_offset - base_offset;
1059 if (base_offset >= delta_obj_offset)
1060 die("delta base offset out of bound");
1062 } else if (kind == OBJ_REF_DELTA) {
1063 /* The base entry _must_ be in the same pack */
1064 base_offset = find_pack_entry_one(base_info, p);
1066 die("failed to find delta-pack base object %s",
1067 sha1_to_hex(base_info));
1070 die("I am totally screwed");
1071 *base_obj_offset = base_offset;
1075 /* forward declaration for a mutually recursive function */
1076 static int packed_object_info(struct packed_git *p, unsigned long offset,
1077 char *type, unsigned long *sizep);
1079 static int packed_delta_info(struct packed_git *p,
1080 struct pack_window **w_curs,
1081 unsigned long offset,
1082 enum object_type kind,
1083 unsigned long obj_offset,
1085 unsigned long *sizep)
1087 unsigned long base_offset;
1089 offset = get_delta_base(p, w_curs, offset, kind,
1090 obj_offset, &base_offset);
1092 /* We choose to only get the type of the base object and
1093 * ignore potentially corrupt pack file that expects the delta
1094 * based on a base with a wrong size. This saves tons of
1097 if (packed_object_info(p, base_offset, type, NULL))
1098 die("cannot get info for delta-pack base");
1101 const unsigned char *data;
1102 unsigned char delta_head[20], *in;
1103 unsigned long result_size;
1107 memset(&stream, 0, sizeof(stream));
1108 stream.next_out = delta_head;
1109 stream.avail_out = sizeof(delta_head);
1111 inflateInit(&stream);
1113 in = use_pack(p, w_curs, offset, &stream.avail_in);
1114 stream.next_in = in;
1115 st = inflate(&stream, Z_FINISH);
1116 offset += stream.next_in - in;
1117 } while ((st == Z_OK || st == Z_BUF_ERROR)
1118 && stream.total_out < sizeof(delta_head));
1119 inflateEnd(&stream);
1120 if ((st != Z_STREAM_END) &&
1121 stream.total_out != sizeof(delta_head))
1122 die("delta data unpack-initial failed");
1124 /* Examine the initial part of the delta to figure out
1129 /* ignore base size */
1130 get_delta_hdr_size(&data, delta_head+sizeof(delta_head));
1132 /* Read the result size */
1133 result_size = get_delta_hdr_size(&data, delta_head+sizeof(delta_head));
1134 *sizep = result_size;
1139 static unsigned long unpack_object_header(struct packed_git *p,
1140 struct pack_window **w_curs,
1141 unsigned long offset,
1142 enum object_type *type,
1143 unsigned long *sizep)
1145 unsigned char *base;
1149 /* use_pack() assures us we have [base, base + 20) available
1150 * as a range that we can look at at. (Its actually the hash
1151 * size that is assurred.) With our object header encoding
1152 * the maximum deflated object size is 2^137, which is just
1153 * insane, so we know won't exceed what we have been given.
1155 base = use_pack(p, w_curs, offset, &left);
1156 used = unpack_object_header_gently(base, left, type, sizep);
1158 die("object offset outside of pack file");
1160 return offset + used;
1163 void packed_object_info_detail(struct packed_git *p,
1164 unsigned long offset,
1166 unsigned long *size,
1167 unsigned long *store_size,
1168 unsigned int *delta_chain_length,
1169 unsigned char *base_sha1)
1171 struct pack_window *w_curs = NULL;
1172 unsigned long obj_offset, val;
1173 unsigned char *next_sha1;
1174 enum object_type kind;
1176 *delta_chain_length = 0;
1177 obj_offset = offset;
1178 offset = unpack_object_header(p, &w_curs, offset, &kind, size);
1183 die("pack %s contains unknown object type %d",
1184 p->pack_name, kind);
1189 strcpy(type, type_names[kind]);
1190 *store_size = 0; /* notyet */
1191 unuse_pack(&w_curs);
1194 get_delta_base(p, &w_curs, offset, kind,
1195 obj_offset, &offset);
1196 if (*delta_chain_length == 0) {
1197 /* TODO: find base_sha1 as pointed by offset */
1201 next_sha1 = use_pack(p, &w_curs, offset, NULL);
1202 if (*delta_chain_length == 0)
1203 hashcpy(base_sha1, next_sha1);
1204 offset = find_pack_entry_one(next_sha1, p);
1207 obj_offset = offset;
1208 offset = unpack_object_header(p, &w_curs, offset, &kind, &val);
1209 (*delta_chain_length)++;
1213 static int packed_object_info(struct packed_git *p, unsigned long offset,
1214 char *type, unsigned long *sizep)
1216 struct pack_window *w_curs = NULL;
1217 unsigned long size, obj_offset = offset;
1218 enum object_type kind;
1221 offset = unpack_object_header(p, &w_curs, offset, &kind, &size);
1226 r = packed_delta_info(p, &w_curs, offset, kind,
1227 obj_offset, type, sizep);
1228 unuse_pack(&w_curs);
1234 strcpy(type, type_names[kind]);
1235 unuse_pack(&w_curs);
1238 die("pack %s contains unknown object type %d",
1239 p->pack_name, kind);
1246 static void *unpack_compressed_entry(struct packed_git *p,
1247 struct pack_window **w_curs,
1248 unsigned long offset,
1253 unsigned char *buffer, *in;
1255 buffer = xmalloc(size + 1);
1257 memset(&stream, 0, sizeof(stream));
1258 stream.next_out = buffer;
1259 stream.avail_out = size;
1261 inflateInit(&stream);
1263 in = use_pack(p, w_curs, offset, &stream.avail_in);
1264 stream.next_in = in;
1265 st = inflate(&stream, Z_FINISH);
1266 offset += stream.next_in - in;
1267 } while (st == Z_OK || st == Z_BUF_ERROR);
1268 inflateEnd(&stream);
1269 if ((st != Z_STREAM_END) || stream.total_out != size) {
1277 static void *unpack_delta_entry(struct packed_git *p,
1278 struct pack_window **w_curs,
1279 unsigned long offset,
1280 unsigned long delta_size,
1281 enum object_type kind,
1282 unsigned long obj_offset,
1284 unsigned long *sizep)
1286 void *delta_data, *result, *base;
1287 unsigned long result_size, base_size, base_offset;
1289 offset = get_delta_base(p, w_curs, offset, kind,
1290 obj_offset, &base_offset);
1291 base = unpack_entry(p, base_offset, type, &base_size);
1293 die("failed to read delta base object at %lu from %s",
1294 base_offset, p->pack_name);
1296 delta_data = unpack_compressed_entry(p, w_curs, offset, delta_size);
1297 result = patch_delta(base, base_size,
1298 delta_data, delta_size,
1301 die("failed to apply delta");
1304 *sizep = result_size;
1308 void *unpack_entry(struct packed_git *p, unsigned long offset,
1309 char *type, unsigned long *sizep)
1311 struct pack_window *w_curs = NULL;
1312 unsigned long size, obj_offset = offset;
1313 enum object_type kind;
1316 offset = unpack_object_header(p, &w_curs, offset, &kind, &size);
1320 retval = unpack_delta_entry(p, &w_curs, offset, size,
1321 kind, obj_offset, type, sizep);
1327 strcpy(type, type_names[kind]);
1329 retval = unpack_compressed_entry(p, &w_curs, offset, size);
1332 die("unknown object type %i in %s", kind, p->pack_name);
1334 unuse_pack(&w_curs);
1338 int num_packed_objects(const struct packed_git *p)
1340 /* See check_packed_git_idx() */
1341 return (p->index_size - 20 - 20 - 4*256) / 24;
1344 int nth_packed_object_sha1(const struct packed_git *p, int n,
1345 unsigned char* sha1)
1347 void *index = p->index_base + 256;
1348 if (n < 0 || num_packed_objects(p) <= n)
1350 hashcpy(sha1, (unsigned char *) index + (24 * n) + 4);
1354 unsigned long find_pack_entry_one(const unsigned char *sha1,
1355 struct packed_git *p)
1357 uint32_t *level1_ofs = p->index_base;
1358 int hi = ntohl(level1_ofs[*sha1]);
1359 int lo = ((*sha1 == 0x0) ? 0 : ntohl(level1_ofs[*sha1 - 1]));
1360 void *index = p->index_base + 256;
1363 int mi = (lo + hi) / 2;
1364 int cmp = hashcmp((unsigned char *)index + (24 * mi) + 4, sha1);
1366 return ntohl(*((uint32_t *)((char *)index + (24 * mi))));
1375 static int matches_pack_name(struct packed_git *p, const char *ig)
1377 const char *last_c, *c;
1379 if (!strcmp(p->pack_name, ig))
1382 for (c = p->pack_name, last_c = c; *c;)
1387 if (!strcmp(last_c, ig))
1393 static int find_pack_entry(const unsigned char *sha1, struct pack_entry *e, const char **ignore_packed)
1395 struct packed_git *p;
1396 unsigned long offset;
1398 prepare_packed_git();
1400 for (p = packed_git; p; p = p->next) {
1401 if (ignore_packed) {
1403 for (ig = ignore_packed; *ig; ig++)
1404 if (!matches_pack_name(p, *ig))
1409 offset = find_pack_entry_one(sha1, p);
1413 hashcpy(e->sha1, sha1);
1420 struct packed_git *find_sha1_pack(const unsigned char *sha1,
1421 struct packed_git *packs)
1423 struct packed_git *p;
1425 for (p = packs; p; p = p->next) {
1426 if (find_pack_entry_one(sha1, p))
1433 static int sha1_loose_object_info(const unsigned char *sha1, char *type, unsigned long *sizep)
1436 unsigned long mapsize, size;
1441 map = map_sha1_file(sha1, &mapsize);
1443 return error("unable to find %s", sha1_to_hex(sha1));
1444 if (unpack_sha1_header(&stream, map, mapsize, hdr, sizeof(hdr)) < 0)
1445 status = error("unable to unpack %s header",
1447 if (parse_sha1_header(hdr, type, &size) < 0)
1448 status = error("unable to parse %s header", sha1_to_hex(sha1));
1454 inflateEnd(&stream);
1455 munmap(map, mapsize);
1459 int sha1_object_info(const unsigned char *sha1, char *type, unsigned long *sizep)
1461 struct pack_entry e;
1463 if (!find_pack_entry(sha1, &e, NULL)) {
1464 reprepare_packed_git();
1465 if (!find_pack_entry(sha1, &e, NULL))
1466 return sha1_loose_object_info(sha1, type, sizep);
1468 return packed_object_info(e.p, e.offset, type, sizep);
1471 static void *read_packed_sha1(const unsigned char *sha1, char *type, unsigned long *size)
1473 struct pack_entry e;
1475 if (!find_pack_entry(sha1, &e, NULL))
1478 return unpack_entry(e.p, e.offset, type, size);
1481 void * read_sha1_file(const unsigned char *sha1, char *type, unsigned long *size)
1483 unsigned long mapsize;
1486 buf = read_packed_sha1(sha1, type, size);
1489 map = map_sha1_file(sha1, &mapsize);
1491 buf = unpack_sha1_file(map, mapsize, type, size);
1492 munmap(map, mapsize);
1495 reprepare_packed_git();
1496 return read_packed_sha1(sha1, type, size);
1499 void *read_object_with_reference(const unsigned char *sha1,
1500 const char *required_type,
1501 unsigned long *size,
1502 unsigned char *actual_sha1_return)
1506 unsigned long isize;
1507 unsigned char actual_sha1[20];
1509 hashcpy(actual_sha1, sha1);
1511 int ref_length = -1;
1512 const char *ref_type = NULL;
1514 buffer = read_sha1_file(actual_sha1, type, &isize);
1517 if (!strcmp(type, required_type)) {
1519 if (actual_sha1_return)
1520 hashcpy(actual_sha1_return, actual_sha1);
1523 /* Handle references */
1524 else if (!strcmp(type, commit_type))
1526 else if (!strcmp(type, tag_type))
1527 ref_type = "object ";
1532 ref_length = strlen(ref_type);
1534 if (memcmp(buffer, ref_type, ref_length) ||
1535 get_sha1_hex((char *) buffer + ref_length, actual_sha1)) {
1540 /* Now we have the ID of the referred-to object in
1541 * actual_sha1. Check again. */
1545 static void write_sha1_file_prepare(void *buf, unsigned long len,
1546 const char *type, unsigned char *sha1,
1547 unsigned char *hdr, int *hdrlen)
1551 /* Generate the header */
1552 *hdrlen = sprintf((char *)hdr, "%s %lu", type, len)+1;
1556 SHA1_Update(&c, hdr, *hdrlen);
1557 SHA1_Update(&c, buf, len);
1558 SHA1_Final(sha1, &c);
1562 * Link the tempfile to the final place, possibly creating the
1563 * last directory level as you do so.
1565 * Returns the errno on failure, 0 on success.
1567 static int link_temp_to_file(const char *tmpfile, const char *filename)
1572 if (!link(tmpfile, filename))
1576 * Try to mkdir the last path component if that failed.
1578 * Re-try the "link()" regardless of whether the mkdir
1579 * succeeds, since a race might mean that somebody
1583 dir = strrchr(filename, '/');
1586 if (!mkdir(filename, 0777) && adjust_shared_perm(filename)) {
1591 if (!link(tmpfile, filename))
1599 * Move the just written object into its final resting place
1601 int move_temp_to_file(const char *tmpfile, const char *filename)
1603 int ret = link_temp_to_file(tmpfile, filename);
1606 * Coda hack - coda doesn't like cross-directory links,
1607 * so we fall back to a rename, which will mean that it
1608 * won't be able to check collisions, but that's not a
1611 * The same holds for FAT formatted media.
1613 * When this succeeds, we just return 0. We have nothing
1616 if (ret && ret != EEXIST) {
1617 if (!rename(tmpfile, filename))
1623 if (ret != EEXIST) {
1624 return error("unable to write sha1 filename %s: %s\n", filename, strerror(ret));
1626 /* FIXME!!! Collision check here ? */
1632 static int write_buffer(int fd, const void *buf, size_t len)
1634 if (write_in_full(fd, buf, len) < 0)
1635 return error("file write error (%s)", strerror(errno));
1639 static int write_binary_header(unsigned char *hdr, enum object_type type, unsigned long len)
1644 c = (type << 4) | (len & 15);
1657 static void setup_object_header(z_stream *stream, const char *type, unsigned long len)
1661 if (use_legacy_headers) {
1662 while (deflate(stream, 0) == Z_OK)
1666 if (!strcmp(type, blob_type))
1667 obj_type = OBJ_BLOB;
1668 else if (!strcmp(type, tree_type))
1669 obj_type = OBJ_TREE;
1670 else if (!strcmp(type, commit_type))
1671 obj_type = OBJ_COMMIT;
1672 else if (!strcmp(type, tag_type))
1675 die("trying to generate bogus object of type '%s'", type);
1676 hdr = write_binary_header(stream->next_out, obj_type, len);
1677 stream->total_out = hdr;
1678 stream->next_out += hdr;
1679 stream->avail_out -= hdr;
1682 int hash_sha1_file(void *buf, unsigned long len, const char *type,
1683 unsigned char *sha1)
1685 unsigned char hdr[50];
1687 write_sha1_file_prepare(buf, len, type, sha1, hdr, &hdrlen);
1691 int write_sha1_file(void *buf, unsigned long len, const char *type, unsigned char *returnsha1)
1694 unsigned char *compressed;
1696 unsigned char sha1[20];
1698 static char tmpfile[PATH_MAX];
1699 unsigned char hdr[50];
1702 /* Normally if we have it in the pack then we do not bother writing
1703 * it out into .git/objects/??/?{38} file.
1705 write_sha1_file_prepare(buf, len, type, sha1, hdr, &hdrlen);
1706 filename = sha1_file_name(sha1);
1708 hashcpy(returnsha1, sha1);
1709 if (has_sha1_file(sha1))
1711 fd = open(filename, O_RDONLY);
1714 * FIXME!!! We might do collision checking here, but we'd
1715 * need to uncompress the old file and check it. Later.
1721 if (errno != ENOENT) {
1722 return error("sha1 file %s: %s\n", filename, strerror(errno));
1725 snprintf(tmpfile, sizeof(tmpfile), "%s/obj_XXXXXX", get_object_directory());
1727 fd = mkstemp(tmpfile);
1730 return error("insufficient permission for adding an object to repository database %s\n", get_object_directory());
1732 return error("unable to create temporary sha1 filename %s: %s\n", tmpfile, strerror(errno));
1736 memset(&stream, 0, sizeof(stream));
1737 deflateInit(&stream, zlib_compression_level);
1738 size = 8 + deflateBound(&stream, len+hdrlen);
1739 compressed = xmalloc(size);
1742 stream.next_out = compressed;
1743 stream.avail_out = size;
1745 /* First header.. */
1746 stream.next_in = hdr;
1747 stream.avail_in = hdrlen;
1748 setup_object_header(&stream, type, len);
1750 /* Then the data itself.. */
1751 stream.next_in = buf;
1752 stream.avail_in = len;
1753 while (deflate(&stream, Z_FINISH) == Z_OK)
1755 deflateEnd(&stream);
1756 size = stream.total_out;
1758 if (write_buffer(fd, compressed, size) < 0)
1759 die("unable to write sha1 file");
1764 return move_temp_to_file(tmpfile, filename);
1768 * We need to unpack and recompress the object for writing
1769 * it out to a different file.
1771 static void *repack_object(const unsigned char *sha1, unsigned long *objsize)
1775 unsigned char *unpacked;
1782 /* need to unpack and recompress it by itself */
1783 unpacked = read_packed_sha1(sha1, type, &len);
1785 error("cannot read sha1_file for %s", sha1_to_hex(sha1));
1787 hdrlen = sprintf(hdr, "%s %lu", type, len) + 1;
1790 memset(&stream, 0, sizeof(stream));
1791 deflateInit(&stream, zlib_compression_level);
1792 size = deflateBound(&stream, len + hdrlen);
1793 buf = xmalloc(size);
1796 stream.next_out = buf;
1797 stream.avail_out = size;
1799 /* First header.. */
1800 stream.next_in = (void *)hdr;
1801 stream.avail_in = hdrlen;
1802 while (deflate(&stream, 0) == Z_OK)
1805 /* Then the data itself.. */
1806 stream.next_in = unpacked;
1807 stream.avail_in = len;
1808 while (deflate(&stream, Z_FINISH) == Z_OK)
1810 deflateEnd(&stream);
1813 *objsize = stream.total_out;
1817 int write_sha1_to_fd(int fd, const unsigned char *sha1)
1820 unsigned long objsize;
1821 void *buf = map_sha1_file(sha1, &objsize);
1824 retval = write_buffer(fd, buf, objsize);
1825 munmap(buf, objsize);
1829 buf = repack_object(sha1, &objsize);
1830 retval = write_buffer(fd, buf, objsize);
1835 int write_sha1_from_fd(const unsigned char *sha1, int fd, char *buffer,
1836 size_t bufsize, size_t *bufposn)
1838 char tmpfile[PATH_MAX];
1841 unsigned char real_sha1[20];
1842 unsigned char discard[4096];
1846 snprintf(tmpfile, sizeof(tmpfile), "%s/obj_XXXXXX", get_object_directory());
1848 local = mkstemp(tmpfile);
1851 return error("insufficient permission for adding an object to repository database %s\n", get_object_directory());
1853 return error("unable to create temporary sha1 filename %s: %s\n", tmpfile, strerror(errno));
1856 memset(&stream, 0, sizeof(stream));
1858 inflateInit(&stream);
1865 stream.avail_in = *bufposn;
1866 stream.next_in = (unsigned char *) buffer;
1868 stream.next_out = discard;
1869 stream.avail_out = sizeof(discard);
1870 ret = inflate(&stream, Z_SYNC_FLUSH);
1871 SHA1_Update(&c, discard, sizeof(discard) -
1873 } while (stream.avail_in && ret == Z_OK);
1874 if (write_buffer(local, buffer, *bufposn - stream.avail_in) < 0)
1875 die("unable to write sha1 file");
1876 memmove(buffer, buffer + *bufposn - stream.avail_in,
1878 *bufposn = stream.avail_in;
1882 size = xread(fd, buffer + *bufposn, bufsize - *bufposn);
1887 return error("Connection closed?");
1888 perror("Reading from connection");
1893 inflateEnd(&stream);
1896 SHA1_Final(real_sha1, &c);
1897 if (ret != Z_STREAM_END) {
1899 return error("File %s corrupted", sha1_to_hex(sha1));
1901 if (hashcmp(sha1, real_sha1)) {
1903 return error("File %s has bad hash", sha1_to_hex(sha1));
1906 return move_temp_to_file(tmpfile, sha1_file_name(sha1));
1909 int has_pack_index(const unsigned char *sha1)
1912 if (stat(sha1_pack_index_name(sha1), &st))
1917 int has_pack_file(const unsigned char *sha1)
1920 if (stat(sha1_pack_name(sha1), &st))
1925 int has_sha1_pack(const unsigned char *sha1, const char **ignore_packed)
1927 struct pack_entry e;
1928 return find_pack_entry(sha1, &e, ignore_packed);
1931 int has_sha1_file(const unsigned char *sha1)
1934 struct pack_entry e;
1936 if (find_pack_entry(sha1, &e, NULL))
1938 return find_sha1_file(sha1, &st) ? 1 : 0;
1942 * reads from fd as long as possible into a supplied buffer of size bytes.
1943 * If necessary the buffer's size is increased using realloc()
1945 * returns 0 if anything went fine and -1 otherwise
1947 * NOTE: both buf and size may change, but even when -1 is returned
1948 * you still have to free() it yourself.
1950 int read_pipe(int fd, char** return_buf, unsigned long* return_size)
1952 char* buf = *return_buf;
1953 unsigned long size = *return_size;
1955 unsigned long off = 0;
1958 iret = xread(fd, buf + off, size - off);
1963 buf = xrealloc(buf, size);
1976 int index_pipe(unsigned char *sha1, int fd, const char *type, int write_object)
1978 unsigned long size = 4096;
1979 char *buf = xmalloc(size);
1982 if (read_pipe(fd, &buf, &size)) {
1990 ret = write_sha1_file(buf, size, type, sha1);
1992 ret = hash_sha1_file(buf, size, type, sha1);
1997 int index_fd(unsigned char *sha1, int fd, struct stat *st, int write_object, const char *type)
1999 unsigned long size = st->st_size;
2005 buf = xmmap(NULL, size, PROT_READ, MAP_PRIVATE, fd, 0);
2011 ret = write_sha1_file(buf, size, type, sha1);
2013 ret = hash_sha1_file(buf, size, type, sha1);
2019 int index_path(unsigned char *sha1, const char *path, struct stat *st, int write_object)
2024 switch (st->st_mode & S_IFMT) {
2026 fd = open(path, O_RDONLY);
2028 return error("open(\"%s\"): %s", path,
2030 if (index_fd(sha1, fd, st, write_object, NULL) < 0)
2031 return error("%s: failed to insert into database",
2035 target = xmalloc(st->st_size+1);
2036 if (readlink(path, target, st->st_size+1) != st->st_size) {
2037 char *errstr = strerror(errno);
2039 return error("readlink(\"%s\"): %s", path,
2043 hash_sha1_file(target, st->st_size, blob_type, sha1);
2044 else if (write_sha1_file(target, st->st_size, blob_type, sha1))
2045 return error("%s: failed to insert into database",
2050 return error("%s: unsupported file type", path);
2055 int read_pack_header(int fd, struct pack_header *header)
2057 char *c = (char*)header;
2058 ssize_t remaining = sizeof(struct pack_header);
2060 ssize_t r = xread(fd, c, remaining);
2062 /* "eof before pack header was fully read" */
2063 return PH_ERROR_EOF;
2066 } while (remaining > 0);
2067 if (header->hdr_signature != htonl(PACK_SIGNATURE))
2068 /* "protocol error (pack signature mismatch detected)" */
2069 return PH_ERROR_PACK_SIGNATURE;
2070 if (!pack_version_ok(header->hdr_version))
2071 /* "protocol error (pack version unsupported)" */
2072 return PH_ERROR_PROTOCOL;