fix sha1_pack_index_name()
[git/gitweb.git] / sha1_file.c
blobadcf37c3f68d16200b01adae441fa3d8f68e3c02
1 /*
2 * GIT - The information manager from hell
4 * Copyright (C) Linus Torvalds, 2005
6 * This handles basic git sha1 object files - packing, unpacking,
7 * creation etc.
8 */
9 #include "cache.h"
10 #include "delta.h"
11 #include "pack.h"
12 #include "blob.h"
13 #include "commit.h"
14 #include "tag.h"
15 #include "tree.h"
16 #include "refs.h"
17 #include "pack-revindex.h"
18 #include "sha1-lookup.h"
20 #ifndef O_NOATIME
21 #if defined(__linux__) && (defined(__i386__) || defined(__PPC__))
22 #define O_NOATIME 01000000
23 #else
24 #define O_NOATIME 0
25 #endif
26 #endif
28 #ifdef NO_C99_FORMAT
29 #define SZ_FMT "lu"
30 static unsigned long sz_fmt(size_t s) { return (unsigned long)s; }
31 #else
32 #define SZ_FMT "zu"
33 static size_t sz_fmt(size_t s) { return s; }
34 #endif
36 const unsigned char null_sha1[20];
38 static unsigned int sha1_file_open_flag = O_NOATIME;
40 const signed char hexval_table[256] = {
41 -1, -1, -1, -1, -1, -1, -1, -1, /* 00-07 */
42 -1, -1, -1, -1, -1, -1, -1, -1, /* 08-0f */
43 -1, -1, -1, -1, -1, -1, -1, -1, /* 10-17 */
44 -1, -1, -1, -1, -1, -1, -1, -1, /* 18-1f */
45 -1, -1, -1, -1, -1, -1, -1, -1, /* 20-27 */
46 -1, -1, -1, -1, -1, -1, -1, -1, /* 28-2f */
47 0, 1, 2, 3, 4, 5, 6, 7, /* 30-37 */
48 8, 9, -1, -1, -1, -1, -1, -1, /* 38-3f */
49 -1, 10, 11, 12, 13, 14, 15, -1, /* 40-47 */
50 -1, -1, -1, -1, -1, -1, -1, -1, /* 48-4f */
51 -1, -1, -1, -1, -1, -1, -1, -1, /* 50-57 */
52 -1, -1, -1, -1, -1, -1, -1, -1, /* 58-5f */
53 -1, 10, 11, 12, 13, 14, 15, -1, /* 60-67 */
54 -1, -1, -1, -1, -1, -1, -1, -1, /* 68-67 */
55 -1, -1, -1, -1, -1, -1, -1, -1, /* 70-77 */
56 -1, -1, -1, -1, -1, -1, -1, -1, /* 78-7f */
57 -1, -1, -1, -1, -1, -1, -1, -1, /* 80-87 */
58 -1, -1, -1, -1, -1, -1, -1, -1, /* 88-8f */
59 -1, -1, -1, -1, -1, -1, -1, -1, /* 90-97 */
60 -1, -1, -1, -1, -1, -1, -1, -1, /* 98-9f */
61 -1, -1, -1, -1, -1, -1, -1, -1, /* a0-a7 */
62 -1, -1, -1, -1, -1, -1, -1, -1, /* a8-af */
63 -1, -1, -1, -1, -1, -1, -1, -1, /* b0-b7 */
64 -1, -1, -1, -1, -1, -1, -1, -1, /* b8-bf */
65 -1, -1, -1, -1, -1, -1, -1, -1, /* c0-c7 */
66 -1, -1, -1, -1, -1, -1, -1, -1, /* c8-cf */
67 -1, -1, -1, -1, -1, -1, -1, -1, /* d0-d7 */
68 -1, -1, -1, -1, -1, -1, -1, -1, /* d8-df */
69 -1, -1, -1, -1, -1, -1, -1, -1, /* e0-e7 */
70 -1, -1, -1, -1, -1, -1, -1, -1, /* e8-ef */
71 -1, -1, -1, -1, -1, -1, -1, -1, /* f0-f7 */
72 -1, -1, -1, -1, -1, -1, -1, -1, /* f8-ff */
75 int get_sha1_hex(const char *hex, unsigned char *sha1)
77 int i;
78 for (i = 0; i < 20; i++) {
79 unsigned int val = (hexval(hex[0]) << 4) | hexval(hex[1]);
80 if (val & ~0xff)
81 return -1;
82 *sha1++ = val;
83 hex += 2;
85 return 0;
88 int safe_create_leading_directories(char *path)
90 char *pos = path;
91 struct stat st;
93 if (is_absolute_path(path))
94 pos++;
96 while (pos) {
97 pos = strchr(pos, '/');
98 if (!pos)
99 break;
100 *pos = 0;
101 if (!stat(path, &st)) {
102 /* path exists */
103 if (!S_ISDIR(st.st_mode)) {
104 *pos = '/';
105 return -3;
108 else if (mkdir(path, 0777)) {
109 *pos = '/';
110 return -1;
112 else if (adjust_shared_perm(path)) {
113 *pos = '/';
114 return -2;
116 *pos++ = '/';
118 return 0;
121 char * sha1_to_hex(const unsigned char *sha1)
123 static int bufno;
124 static char hexbuffer[4][50];
125 static const char hex[] = "0123456789abcdef";
126 char *buffer = hexbuffer[3 & ++bufno], *buf = buffer;
127 int i;
129 for (i = 0; i < 20; i++) {
130 unsigned int val = *sha1++;
131 *buf++ = hex[val >> 4];
132 *buf++ = hex[val & 0xf];
134 *buf = '\0';
136 return buffer;
139 static void fill_sha1_path(char *pathbuf, const unsigned char *sha1)
141 int i;
142 for (i = 0; i < 20; i++) {
143 static char hex[] = "0123456789abcdef";
144 unsigned int val = sha1[i];
145 char *pos = pathbuf + i*2 + (i > 0);
146 *pos++ = hex[val >> 4];
147 *pos = hex[val & 0xf];
152 * NOTE! This returns a statically allocated buffer, so you have to be
153 * careful about using it. Do an "xstrdup()" if you need to save the
154 * filename.
156 * Also note that this returns the location for creating. Reading
157 * SHA1 file can happen from any alternate directory listed in the
158 * DB_ENVIRONMENT environment variable if it is not found in
159 * the primary object database.
161 char *sha1_file_name(const unsigned char *sha1)
163 static char *name, *base;
165 if (!base) {
166 const char *sha1_file_directory = get_object_directory();
167 int len = strlen(sha1_file_directory);
168 base = xmalloc(len + 60);
169 memcpy(base, sha1_file_directory, len);
170 memset(base+len, 0, 60);
171 base[len] = '/';
172 base[len+3] = '/';
173 name = base + len + 1;
175 fill_sha1_path(name, sha1);
176 return base;
179 static char *sha1_get_pack_name(const unsigned char *sha1,
180 char **name, char **base, const char *which)
182 static const char hex[] = "0123456789abcdef";
183 char *buf;
184 int i;
186 if (!*base) {
187 const char *sha1_file_directory = get_object_directory();
188 int len = strlen(sha1_file_directory);
189 *base = xmalloc(len + 60);
190 sprintf(*base, "%s/pack/pack-1234567890123456789012345678901234567890.%s",
191 sha1_file_directory, which);
192 *name = *base + len + 11;
195 buf = *name;
197 for (i = 0; i < 20; i++) {
198 unsigned int val = *sha1++;
199 *buf++ = hex[val >> 4];
200 *buf++ = hex[val & 0xf];
203 return *base;
206 char *sha1_pack_name(const unsigned char *sha1)
208 static char *name, *base;
210 return sha1_get_pack_name(sha1, &name, &base, "pack");
213 char *sha1_pack_index_name(const unsigned char *sha1)
215 static char *name, *base;
217 return sha1_get_pack_name(sha1, &name, &base, "idx");
220 struct alternate_object_database *alt_odb_list;
221 static struct alternate_object_database **alt_odb_tail;
223 static void read_info_alternates(const char * alternates, int depth);
226 * Prepare alternate object database registry.
228 * The variable alt_odb_list points at the list of struct
229 * alternate_object_database. The elements on this list come from
230 * non-empty elements from colon separated ALTERNATE_DB_ENVIRONMENT
231 * environment variable, and $GIT_OBJECT_DIRECTORY/info/alternates,
232 * whose contents is similar to that environment variable but can be
233 * LF separated. Its base points at a statically allocated buffer that
234 * contains "/the/directory/corresponding/to/.git/objects/...", while
235 * its name points just after the slash at the end of ".git/objects/"
236 * in the example above, and has enough space to hold 40-byte hex
237 * SHA1, an extra slash for the first level indirection, and the
238 * terminating NUL.
240 static int link_alt_odb_entry(const char * entry, int len, const char * relative_base, int depth)
242 struct stat st;
243 const char *objdir = get_object_directory();
244 struct alternate_object_database *ent;
245 struct alternate_object_database *alt;
246 /* 43 = 40-byte + 2 '/' + terminating NUL */
247 int pfxlen = len;
248 int entlen = pfxlen + 43;
249 int base_len = -1;
251 if (!is_absolute_path(entry) && relative_base) {
252 /* Relative alt-odb */
253 if (base_len < 0)
254 base_len = strlen(relative_base) + 1;
255 entlen += base_len;
256 pfxlen += base_len;
258 ent = xmalloc(sizeof(*ent) + entlen);
260 if (!is_absolute_path(entry) && relative_base) {
261 memcpy(ent->base, relative_base, base_len - 1);
262 ent->base[base_len - 1] = '/';
263 memcpy(ent->base + base_len, entry, len);
265 else
266 memcpy(ent->base, entry, pfxlen);
268 ent->name = ent->base + pfxlen + 1;
269 ent->base[pfxlen + 3] = '/';
270 ent->base[pfxlen] = ent->base[entlen-1] = 0;
272 /* Detect cases where alternate disappeared */
273 if (stat(ent->base, &st) || !S_ISDIR(st.st_mode)) {
274 error("object directory %s does not exist; "
275 "check .git/objects/info/alternates.",
276 ent->base);
277 free(ent);
278 return -1;
281 /* Prevent the common mistake of listing the same
282 * thing twice, or object directory itself.
284 for (alt = alt_odb_list; alt; alt = alt->next) {
285 if (!memcmp(ent->base, alt->base, pfxlen)) {
286 free(ent);
287 return -1;
290 if (!memcmp(ent->base, objdir, pfxlen)) {
291 free(ent);
292 return -1;
295 /* add the alternate entry */
296 *alt_odb_tail = ent;
297 alt_odb_tail = &(ent->next);
298 ent->next = NULL;
300 /* recursively add alternates */
301 read_info_alternates(ent->base, depth + 1);
303 ent->base[pfxlen] = '/';
305 return 0;
308 static void link_alt_odb_entries(const char *alt, const char *ep, int sep,
309 const char *relative_base, int depth)
311 const char *cp, *last;
313 if (depth > 5) {
314 error("%s: ignoring alternate object stores, nesting too deep.",
315 relative_base);
316 return;
319 last = alt;
320 while (last < ep) {
321 cp = last;
322 if (cp < ep && *cp == '#') {
323 while (cp < ep && *cp != sep)
324 cp++;
325 last = cp + 1;
326 continue;
328 while (cp < ep && *cp != sep)
329 cp++;
330 if (last != cp) {
331 if (!is_absolute_path(last) && depth) {
332 error("%s: ignoring relative alternate object store %s",
333 relative_base, last);
334 } else {
335 link_alt_odb_entry(last, cp - last,
336 relative_base, depth);
339 while (cp < ep && *cp == sep)
340 cp++;
341 last = cp;
345 static void read_info_alternates(const char * relative_base, int depth)
347 char *map;
348 size_t mapsz;
349 struct stat st;
350 const char alt_file_name[] = "info/alternates";
351 /* Given that relative_base is no longer than PATH_MAX,
352 ensure that "path" has enough space to append "/", the
353 file name, "info/alternates", and a trailing NUL. */
354 char path[PATH_MAX + 1 + sizeof alt_file_name];
355 int fd;
357 sprintf(path, "%s/%s", relative_base, alt_file_name);
358 fd = open(path, O_RDONLY);
359 if (fd < 0)
360 return;
361 if (fstat(fd, &st) || (st.st_size == 0)) {
362 close(fd);
363 return;
365 mapsz = xsize_t(st.st_size);
366 map = xmmap(NULL, mapsz, PROT_READ, MAP_PRIVATE, fd, 0);
367 close(fd);
369 link_alt_odb_entries(map, map + mapsz, '\n', relative_base, depth);
371 munmap(map, mapsz);
374 void add_to_alternates_file(const char *reference)
376 struct lock_file *lock = xcalloc(1, sizeof(struct lock_file));
377 int fd = hold_lock_file_for_append(lock, git_path("objects/info/alternates"), 1);
378 char *alt = mkpath("%s/objects\n", reference);
379 write_or_die(fd, alt, strlen(alt));
380 if (commit_lock_file(lock))
381 die("could not close alternates file");
382 if (alt_odb_tail)
383 link_alt_odb_entries(alt, alt + strlen(alt), '\n', NULL, 0);
386 void prepare_alt_odb(void)
388 const char *alt;
390 if (alt_odb_tail)
391 return;
393 alt = getenv(ALTERNATE_DB_ENVIRONMENT);
394 if (!alt) alt = "";
396 alt_odb_tail = &alt_odb_list;
397 link_alt_odb_entries(alt, alt + strlen(alt), ':', NULL, 0);
399 read_info_alternates(get_object_directory(), 0);
402 static char *find_sha1_file(const unsigned char *sha1, struct stat *st)
404 char *name = sha1_file_name(sha1);
405 struct alternate_object_database *alt;
407 if (!stat(name, st))
408 return name;
409 prepare_alt_odb();
410 for (alt = alt_odb_list; alt; alt = alt->next) {
411 name = alt->name;
412 fill_sha1_path(name, sha1);
413 if (!stat(alt->base, st))
414 return alt->base;
416 return NULL;
419 static unsigned int pack_used_ctr;
420 static unsigned int pack_mmap_calls;
421 static unsigned int peak_pack_open_windows;
422 static unsigned int pack_open_windows;
423 static size_t peak_pack_mapped;
424 static size_t pack_mapped;
425 struct packed_git *packed_git;
427 void pack_report(void)
429 fprintf(stderr,
430 "pack_report: getpagesize() = %10" SZ_FMT "\n"
431 "pack_report: core.packedGitWindowSize = %10" SZ_FMT "\n"
432 "pack_report: core.packedGitLimit = %10" SZ_FMT "\n",
433 sz_fmt(getpagesize()),
434 sz_fmt(packed_git_window_size),
435 sz_fmt(packed_git_limit));
436 fprintf(stderr,
437 "pack_report: pack_used_ctr = %10u\n"
438 "pack_report: pack_mmap_calls = %10u\n"
439 "pack_report: pack_open_windows = %10u / %10u\n"
440 "pack_report: pack_mapped = "
441 "%10" SZ_FMT " / %10" SZ_FMT "\n",
442 pack_used_ctr,
443 pack_mmap_calls,
444 pack_open_windows, peak_pack_open_windows,
445 sz_fmt(pack_mapped), sz_fmt(peak_pack_mapped));
448 static int check_packed_git_idx(const char *path, struct packed_git *p)
450 void *idx_map;
451 struct pack_idx_header *hdr;
452 size_t idx_size;
453 uint32_t version, nr, i, *index;
454 int fd = open(path, O_RDONLY);
455 struct stat st;
457 if (fd < 0)
458 return -1;
459 if (fstat(fd, &st)) {
460 close(fd);
461 return -1;
463 idx_size = xsize_t(st.st_size);
464 if (idx_size < 4 * 256 + 20 + 20) {
465 close(fd);
466 return error("index file %s is too small", path);
468 idx_map = xmmap(NULL, idx_size, PROT_READ, MAP_PRIVATE, fd, 0);
469 close(fd);
471 hdr = idx_map;
472 if (hdr->idx_signature == htonl(PACK_IDX_SIGNATURE)) {
473 version = ntohl(hdr->idx_version);
474 if (version < 2 || version > 2) {
475 munmap(idx_map, idx_size);
476 return error("index file %s is version %d"
477 " and is not supported by this binary"
478 " (try upgrading GIT to a newer version)",
479 path, version);
481 } else
482 version = 1;
484 nr = 0;
485 index = idx_map;
486 if (version > 1)
487 index += 2; /* skip index header */
488 for (i = 0; i < 256; i++) {
489 uint32_t n = ntohl(index[i]);
490 if (n < nr) {
491 munmap(idx_map, idx_size);
492 return error("non-monotonic index %s", path);
494 nr = n;
497 if (version == 1) {
499 * Total size:
500 * - 256 index entries 4 bytes each
501 * - 24-byte entries * nr (20-byte sha1 + 4-byte offset)
502 * - 20-byte SHA1 of the packfile
503 * - 20-byte SHA1 file checksum
505 if (idx_size != 4*256 + nr * 24 + 20 + 20) {
506 munmap(idx_map, idx_size);
507 return error("wrong index v1 file size in %s", path);
509 } else if (version == 2) {
511 * Minimum size:
512 * - 8 bytes of header
513 * - 256 index entries 4 bytes each
514 * - 20-byte sha1 entry * nr
515 * - 4-byte crc entry * nr
516 * - 4-byte offset entry * nr
517 * - 20-byte SHA1 of the packfile
518 * - 20-byte SHA1 file checksum
519 * And after the 4-byte offset table might be a
520 * variable sized table containing 8-byte entries
521 * for offsets larger than 2^31.
523 unsigned long min_size = 8 + 4*256 + nr*(20 + 4 + 4) + 20 + 20;
524 unsigned long max_size = min_size;
525 if (nr)
526 max_size += (nr - 1)*8;
527 if (idx_size < min_size || idx_size > max_size) {
528 munmap(idx_map, idx_size);
529 return error("wrong index v2 file size in %s", path);
531 if (idx_size != min_size &&
533 * make sure we can deal with large pack offsets.
534 * 31-bit signed offset won't be enough, neither
535 * 32-bit unsigned one will be.
537 (sizeof(off_t) <= 4)) {
538 munmap(idx_map, idx_size);
539 return error("pack too large for current definition of off_t in %s", path);
543 p->index_version = version;
544 p->index_data = idx_map;
545 p->index_size = idx_size;
546 p->num_objects = nr;
547 return 0;
550 int open_pack_index(struct packed_git *p)
552 char *idx_name;
553 int ret;
555 if (p->index_data)
556 return 0;
558 idx_name = xstrdup(p->pack_name);
559 strcpy(idx_name + strlen(idx_name) - strlen(".pack"), ".idx");
560 ret = check_packed_git_idx(idx_name, p);
561 free(idx_name);
562 return ret;
565 static void scan_windows(struct packed_git *p,
566 struct packed_git **lru_p,
567 struct pack_window **lru_w,
568 struct pack_window **lru_l)
570 struct pack_window *w, *w_l;
572 for (w_l = NULL, w = p->windows; w; w = w->next) {
573 if (!w->inuse_cnt) {
574 if (!*lru_w || w->last_used < (*lru_w)->last_used) {
575 *lru_p = p;
576 *lru_w = w;
577 *lru_l = w_l;
580 w_l = w;
584 static int unuse_one_window(struct packed_git *current, int keep_fd)
586 struct packed_git *p, *lru_p = NULL;
587 struct pack_window *lru_w = NULL, *lru_l = NULL;
589 if (current)
590 scan_windows(current, &lru_p, &lru_w, &lru_l);
591 for (p = packed_git; p; p = p->next)
592 scan_windows(p, &lru_p, &lru_w, &lru_l);
593 if (lru_p) {
594 munmap(lru_w->base, lru_w->len);
595 pack_mapped -= lru_w->len;
596 if (lru_l)
597 lru_l->next = lru_w->next;
598 else {
599 lru_p->windows = lru_w->next;
600 if (!lru_p->windows && lru_p->pack_fd != keep_fd) {
601 close(lru_p->pack_fd);
602 lru_p->pack_fd = -1;
605 free(lru_w);
606 pack_open_windows--;
607 return 1;
609 return 0;
612 void release_pack_memory(size_t need, int fd)
614 size_t cur = pack_mapped;
615 while (need >= (cur - pack_mapped) && unuse_one_window(NULL, fd))
616 ; /* nothing */
619 void close_pack_windows(struct packed_git *p)
621 while (p->windows) {
622 struct pack_window *w = p->windows;
624 if (w->inuse_cnt)
625 die("pack '%s' still has open windows to it",
626 p->pack_name);
627 munmap(w->base, w->len);
628 pack_mapped -= w->len;
629 pack_open_windows--;
630 p->windows = w->next;
631 free(w);
635 void unuse_pack(struct pack_window **w_cursor)
637 struct pack_window *w = *w_cursor;
638 if (w) {
639 w->inuse_cnt--;
640 *w_cursor = NULL;
645 * Do not call this directly as this leaks p->pack_fd on error return;
646 * call open_packed_git() instead.
648 static int open_packed_git_1(struct packed_git *p)
650 struct stat st;
651 struct pack_header hdr;
652 unsigned char sha1[20];
653 unsigned char *idx_sha1;
654 long fd_flag;
656 if (!p->index_data && open_pack_index(p))
657 return error("packfile %s index unavailable", p->pack_name);
659 p->pack_fd = open(p->pack_name, O_RDONLY);
660 if (p->pack_fd < 0 || fstat(p->pack_fd, &st))
661 return -1;
663 /* If we created the struct before we had the pack we lack size. */
664 if (!p->pack_size) {
665 if (!S_ISREG(st.st_mode))
666 return error("packfile %s not a regular file", p->pack_name);
667 p->pack_size = st.st_size;
668 } else if (p->pack_size != st.st_size)
669 return error("packfile %s size changed", p->pack_name);
671 /* We leave these file descriptors open with sliding mmap;
672 * there is no point keeping them open across exec(), though.
674 fd_flag = fcntl(p->pack_fd, F_GETFD, 0);
675 if (fd_flag < 0)
676 return error("cannot determine file descriptor flags");
677 fd_flag |= FD_CLOEXEC;
678 if (fcntl(p->pack_fd, F_SETFD, fd_flag) == -1)
679 return error("cannot set FD_CLOEXEC");
681 /* Verify we recognize this pack file format. */
682 if (read_in_full(p->pack_fd, &hdr, sizeof(hdr)) != sizeof(hdr))
683 return error("file %s is far too short to be a packfile", p->pack_name);
684 if (hdr.hdr_signature != htonl(PACK_SIGNATURE))
685 return error("file %s is not a GIT packfile", p->pack_name);
686 if (!pack_version_ok(hdr.hdr_version))
687 return error("packfile %s is version %u and not supported"
688 " (try upgrading GIT to a newer version)",
689 p->pack_name, ntohl(hdr.hdr_version));
691 /* Verify the pack matches its index. */
692 if (p->num_objects != ntohl(hdr.hdr_entries))
693 return error("packfile %s claims to have %u objects"
694 " while index indicates %u objects",
695 p->pack_name, ntohl(hdr.hdr_entries),
696 p->num_objects);
697 if (lseek(p->pack_fd, p->pack_size - sizeof(sha1), SEEK_SET) == -1)
698 return error("end of packfile %s is unavailable", p->pack_name);
699 if (read_in_full(p->pack_fd, sha1, sizeof(sha1)) != sizeof(sha1))
700 return error("packfile %s signature is unavailable", p->pack_name);
701 idx_sha1 = ((unsigned char *)p->index_data) + p->index_size - 40;
702 if (hashcmp(sha1, idx_sha1))
703 return error("packfile %s does not match index", p->pack_name);
704 return 0;
707 static int open_packed_git(struct packed_git *p)
709 if (!open_packed_git_1(p))
710 return 0;
711 if (p->pack_fd != -1) {
712 close(p->pack_fd);
713 p->pack_fd = -1;
715 return -1;
718 static int in_window(struct pack_window *win, off_t offset)
720 /* We must promise at least 20 bytes (one hash) after the
721 * offset is available from this window, otherwise the offset
722 * is not actually in this window and a different window (which
723 * has that one hash excess) must be used. This is to support
724 * the object header and delta base parsing routines below.
726 off_t win_off = win->offset;
727 return win_off <= offset
728 && (offset + 20) <= (win_off + win->len);
731 unsigned char* use_pack(struct packed_git *p,
732 struct pack_window **w_cursor,
733 off_t offset,
734 unsigned int *left)
736 struct pack_window *win = *w_cursor;
738 if (p->pack_fd == -1 && open_packed_git(p))
739 die("packfile %s cannot be accessed", p->pack_name);
741 /* Since packfiles end in a hash of their content and its
742 * pointless to ask for an offset into the middle of that
743 * hash, and the in_window function above wouldn't match
744 * don't allow an offset too close to the end of the file.
746 if (offset > (p->pack_size - 20))
747 die("offset beyond end of packfile (truncated pack?)");
749 if (!win || !in_window(win, offset)) {
750 if (win)
751 win->inuse_cnt--;
752 for (win = p->windows; win; win = win->next) {
753 if (in_window(win, offset))
754 break;
756 if (!win) {
757 size_t window_align = packed_git_window_size / 2;
758 off_t len;
759 win = xcalloc(1, sizeof(*win));
760 win->offset = (offset / window_align) * window_align;
761 len = p->pack_size - win->offset;
762 if (len > packed_git_window_size)
763 len = packed_git_window_size;
764 win->len = (size_t)len;
765 pack_mapped += win->len;
766 while (packed_git_limit < pack_mapped
767 && unuse_one_window(p, p->pack_fd))
768 ; /* nothing */
769 win->base = xmmap(NULL, win->len,
770 PROT_READ, MAP_PRIVATE,
771 p->pack_fd, win->offset);
772 if (win->base == MAP_FAILED)
773 die("packfile %s cannot be mapped: %s",
774 p->pack_name,
775 strerror(errno));
776 pack_mmap_calls++;
777 pack_open_windows++;
778 if (pack_mapped > peak_pack_mapped)
779 peak_pack_mapped = pack_mapped;
780 if (pack_open_windows > peak_pack_open_windows)
781 peak_pack_open_windows = pack_open_windows;
782 win->next = p->windows;
783 p->windows = win;
786 if (win != *w_cursor) {
787 win->last_used = pack_used_ctr++;
788 win->inuse_cnt++;
789 *w_cursor = win;
791 offset -= win->offset;
792 if (left)
793 *left = win->len - xsize_t(offset);
794 return win->base + offset;
797 struct packed_git *add_packed_git(const char *path, int path_len, int local)
799 struct stat st;
800 struct packed_git *p = xmalloc(sizeof(*p) + path_len + 2);
803 * Make sure a corresponding .pack file exists and that
804 * the index looks sane.
806 path_len -= strlen(".idx");
807 if (path_len < 1)
808 return NULL;
809 memcpy(p->pack_name, path, path_len);
810 strcpy(p->pack_name + path_len, ".pack");
811 if (stat(p->pack_name, &st) || !S_ISREG(st.st_mode)) {
812 free(p);
813 return NULL;
816 /* ok, it looks sane as far as we can check without
817 * actually mapping the pack file.
819 p->index_version = 0;
820 p->index_data = NULL;
821 p->index_size = 0;
822 p->num_objects = 0;
823 p->pack_size = st.st_size;
824 p->next = NULL;
825 p->windows = NULL;
826 p->pack_fd = -1;
827 p->pack_local = local;
828 p->mtime = st.st_mtime;
829 if (path_len < 40 || get_sha1_hex(path + path_len - 40, p->sha1))
830 hashclr(p->sha1);
831 return p;
834 struct packed_git *parse_pack_index(unsigned char *sha1)
836 char *path = sha1_pack_index_name(sha1);
837 return parse_pack_index_file(sha1, path);
840 struct packed_git *parse_pack_index_file(const unsigned char *sha1,
841 const char *idx_path)
843 const char *path = sha1_pack_name(sha1);
844 struct packed_git *p = xmalloc(sizeof(*p) + strlen(path) + 2);
846 if (check_packed_git_idx(idx_path, p)) {
847 free(p);
848 return NULL;
851 strcpy(p->pack_name, path);
852 p->pack_size = 0;
853 p->next = NULL;
854 p->windows = NULL;
855 p->pack_fd = -1;
856 hashcpy(p->sha1, sha1);
857 return p;
860 void install_packed_git(struct packed_git *pack)
862 pack->next = packed_git;
863 packed_git = pack;
866 static void prepare_packed_git_one(char *objdir, int local)
868 /* Ensure that this buffer is large enough so that we can
869 append "/pack/" without clobbering the stack even if
870 strlen(objdir) were PATH_MAX. */
871 char path[PATH_MAX + 1 + 4 + 1 + 1];
872 int len;
873 DIR *dir;
874 struct dirent *de;
876 sprintf(path, "%s/pack", objdir);
877 len = strlen(path);
878 dir = opendir(path);
879 if (!dir) {
880 if (errno != ENOENT)
881 error("unable to open object pack directory: %s: %s",
882 path, strerror(errno));
883 return;
885 path[len++] = '/';
886 while ((de = readdir(dir)) != NULL) {
887 int namelen = strlen(de->d_name);
888 struct packed_git *p;
890 if (!has_extension(de->d_name, ".idx"))
891 continue;
893 if (len + namelen + 1 > sizeof(path))
894 continue;
896 /* Don't reopen a pack we already have. */
897 strcpy(path + len, de->d_name);
898 for (p = packed_git; p; p = p->next) {
899 if (!memcmp(path, p->pack_name, len + namelen - 4))
900 break;
902 if (p)
903 continue;
904 /* See if it really is a valid .idx file with corresponding
905 * .pack file that we can map.
907 p = add_packed_git(path, len + namelen, local);
908 if (!p)
909 continue;
910 install_packed_git(p);
912 closedir(dir);
915 static int sort_pack(const void *a_, const void *b_)
917 struct packed_git *a = *((struct packed_git **)a_);
918 struct packed_git *b = *((struct packed_git **)b_);
919 int st;
922 * Local packs tend to contain objects specific to our
923 * variant of the project than remote ones. In addition,
924 * remote ones could be on a network mounted filesystem.
925 * Favor local ones for these reasons.
927 st = a->pack_local - b->pack_local;
928 if (st)
929 return -st;
932 * Younger packs tend to contain more recent objects,
933 * and more recent objects tend to get accessed more
934 * often.
936 if (a->mtime < b->mtime)
937 return 1;
938 else if (a->mtime == b->mtime)
939 return 0;
940 return -1;
943 static void rearrange_packed_git(void)
945 struct packed_git **ary, *p;
946 int i, n;
948 for (n = 0, p = packed_git; p; p = p->next)
949 n++;
950 if (n < 2)
951 return;
953 /* prepare an array of packed_git for easier sorting */
954 ary = xcalloc(n, sizeof(struct packed_git *));
955 for (n = 0, p = packed_git; p; p = p->next)
956 ary[n++] = p;
958 qsort(ary, n, sizeof(struct packed_git *), sort_pack);
960 /* link them back again */
961 for (i = 0; i < n - 1; i++)
962 ary[i]->next = ary[i + 1];
963 ary[n - 1]->next = NULL;
964 packed_git = ary[0];
966 free(ary);
969 static int prepare_packed_git_run_once = 0;
970 void prepare_packed_git(void)
972 struct alternate_object_database *alt;
974 if (prepare_packed_git_run_once)
975 return;
976 prepare_packed_git_one(get_object_directory(), 1);
977 prepare_alt_odb();
978 for (alt = alt_odb_list; alt; alt = alt->next) {
979 alt->name[-1] = 0;
980 prepare_packed_git_one(alt->base, 0);
981 alt->name[-1] = '/';
983 rearrange_packed_git();
984 prepare_packed_git_run_once = 1;
987 void reprepare_packed_git(void)
989 prepare_packed_git_run_once = 0;
990 prepare_packed_git();
993 int check_sha1_signature(const unsigned char *sha1, void *map, unsigned long size, const char *type)
995 unsigned char real_sha1[20];
996 hash_sha1_file(map, size, type, real_sha1);
997 return hashcmp(sha1, real_sha1) ? -1 : 0;
1000 static void *map_sha1_file(const unsigned char *sha1, unsigned long *size)
1002 struct stat st;
1003 void *map;
1004 int fd;
1005 char *filename = find_sha1_file(sha1, &st);
1007 if (!filename) {
1008 return NULL;
1011 fd = open(filename, O_RDONLY | sha1_file_open_flag);
1012 if (fd < 0) {
1013 /* See if it works without O_NOATIME */
1014 switch (sha1_file_open_flag) {
1015 default:
1016 fd = open(filename, O_RDONLY);
1017 if (fd >= 0)
1018 break;
1019 /* Fallthrough */
1020 case 0:
1021 return NULL;
1024 /* If it failed once, it will probably fail again.
1025 * Stop using O_NOATIME
1027 sha1_file_open_flag = 0;
1029 *size = xsize_t(st.st_size);
1030 map = xmmap(NULL, *size, PROT_READ, MAP_PRIVATE, fd, 0);
1031 close(fd);
1032 return map;
1035 static int legacy_loose_object(unsigned char *map)
1037 unsigned int word;
1040 * Is it a zlib-compressed buffer? If so, the first byte
1041 * must be 0x78 (15-bit window size, deflated), and the
1042 * first 16-bit word is evenly divisible by 31
1044 word = (map[0] << 8) + map[1];
1045 if (map[0] == 0x78 && !(word % 31))
1046 return 1;
1047 else
1048 return 0;
1051 unsigned long unpack_object_header_gently(const unsigned char *buf, unsigned long len, enum object_type *type, unsigned long *sizep)
1053 unsigned shift;
1054 unsigned char c;
1055 unsigned long size;
1056 unsigned long used = 0;
1058 c = buf[used++];
1059 *type = (c >> 4) & 7;
1060 size = c & 15;
1061 shift = 4;
1062 while (c & 0x80) {
1063 if (len <= used)
1064 return 0;
1065 if (sizeof(long) * 8 <= shift)
1066 return 0;
1067 c = buf[used++];
1068 size += (c & 0x7f) << shift;
1069 shift += 7;
1071 *sizep = size;
1072 return used;
1075 static int unpack_sha1_header(z_stream *stream, unsigned char *map, unsigned long mapsize, void *buffer, unsigned long bufsiz)
1077 unsigned long size, used;
1078 static const char valid_loose_object_type[8] = {
1079 0, /* OBJ_EXT */
1080 1, 1, 1, 1, /* "commit", "tree", "blob", "tag" */
1081 0, /* "delta" and others are invalid in a loose object */
1083 enum object_type type;
1085 /* Get the data stream */
1086 memset(stream, 0, sizeof(*stream));
1087 stream->next_in = map;
1088 stream->avail_in = mapsize;
1089 stream->next_out = buffer;
1090 stream->avail_out = bufsiz;
1092 if (legacy_loose_object(map)) {
1093 inflateInit(stream);
1094 return inflate(stream, 0);
1099 * There used to be a second loose object header format which
1100 * was meant to mimic the in-pack format, allowing for direct
1101 * copy of the object data. This format turned up not to be
1102 * really worth it and we don't write it any longer. But we
1103 * can still read it.
1105 used = unpack_object_header_gently(map, mapsize, &type, &size);
1106 if (!used || !valid_loose_object_type[type])
1107 return -1;
1108 map += used;
1109 mapsize -= used;
1111 /* Set up the stream for the rest.. */
1112 stream->next_in = map;
1113 stream->avail_in = mapsize;
1114 inflateInit(stream);
1116 /* And generate the fake traditional header */
1117 stream->total_out = 1 + snprintf(buffer, bufsiz, "%s %lu",
1118 typename(type), size);
1119 return 0;
1122 static void *unpack_sha1_rest(z_stream *stream, void *buffer, unsigned long size, const unsigned char *sha1)
1124 int bytes = strlen(buffer) + 1;
1125 unsigned char *buf = xmalloc(1+size);
1126 unsigned long n;
1127 int status = Z_OK;
1129 n = stream->total_out - bytes;
1130 if (n > size)
1131 n = size;
1132 memcpy(buf, (char *) buffer + bytes, n);
1133 bytes = n;
1134 if (bytes <= size) {
1136 * The above condition must be (bytes <= size), not
1137 * (bytes < size). In other words, even though we
1138 * expect no more output and set avail_out to zer0,
1139 * the input zlib stream may have bytes that express
1140 * "this concludes the stream", and we *do* want to
1141 * eat that input.
1143 * Otherwise we would not be able to test that we
1144 * consumed all the input to reach the expected size;
1145 * we also want to check that zlib tells us that all
1146 * went well with status == Z_STREAM_END at the end.
1148 stream->next_out = buf + bytes;
1149 stream->avail_out = size - bytes;
1150 while (status == Z_OK)
1151 status = inflate(stream, Z_FINISH);
1153 buf[size] = 0;
1154 if (status == Z_STREAM_END && !stream->avail_in) {
1155 inflateEnd(stream);
1156 return buf;
1159 if (status < 0)
1160 error("corrupt loose object '%s'", sha1_to_hex(sha1));
1161 else if (stream->avail_in)
1162 error("garbage at end of loose object '%s'",
1163 sha1_to_hex(sha1));
1164 free(buf);
1165 return NULL;
1169 * We used to just use "sscanf()", but that's actually way
1170 * too permissive for what we want to check. So do an anal
1171 * object header parse by hand.
1173 static int parse_sha1_header(const char *hdr, unsigned long *sizep)
1175 char type[10];
1176 int i;
1177 unsigned long size;
1180 * The type can be at most ten bytes (including the
1181 * terminating '\0' that we add), and is followed by
1182 * a space.
1184 i = 0;
1185 for (;;) {
1186 char c = *hdr++;
1187 if (c == ' ')
1188 break;
1189 type[i++] = c;
1190 if (i >= sizeof(type))
1191 return -1;
1193 type[i] = 0;
1196 * The length must follow immediately, and be in canonical
1197 * decimal format (ie "010" is not valid).
1199 size = *hdr++ - '0';
1200 if (size > 9)
1201 return -1;
1202 if (size) {
1203 for (;;) {
1204 unsigned long c = *hdr - '0';
1205 if (c > 9)
1206 break;
1207 hdr++;
1208 size = size * 10 + c;
1211 *sizep = size;
1214 * The length must be followed by a zero byte
1216 return *hdr ? -1 : type_from_string(type);
1219 static void *unpack_sha1_file(void *map, unsigned long mapsize, enum object_type *type, unsigned long *size, const unsigned char *sha1)
1221 int ret;
1222 z_stream stream;
1223 char hdr[8192];
1225 ret = unpack_sha1_header(&stream, map, mapsize, hdr, sizeof(hdr));
1226 if (ret < Z_OK || (*type = parse_sha1_header(hdr, size)) < 0)
1227 return NULL;
1229 return unpack_sha1_rest(&stream, hdr, *size, sha1);
1232 unsigned long get_size_from_delta(struct packed_git *p,
1233 struct pack_window **w_curs,
1234 off_t curpos)
1236 const unsigned char *data;
1237 unsigned char delta_head[20], *in;
1238 z_stream stream;
1239 int st;
1241 memset(&stream, 0, sizeof(stream));
1242 stream.next_out = delta_head;
1243 stream.avail_out = sizeof(delta_head);
1245 inflateInit(&stream);
1246 do {
1247 in = use_pack(p, w_curs, curpos, &stream.avail_in);
1248 stream.next_in = in;
1249 st = inflate(&stream, Z_FINISH);
1250 curpos += stream.next_in - in;
1251 } while ((st == Z_OK || st == Z_BUF_ERROR) &&
1252 stream.total_out < sizeof(delta_head));
1253 inflateEnd(&stream);
1254 if ((st != Z_STREAM_END) && stream.total_out != sizeof(delta_head))
1255 die("delta data unpack-initial failed");
1257 /* Examine the initial part of the delta to figure out
1258 * the result size.
1260 data = delta_head;
1262 /* ignore base size */
1263 get_delta_hdr_size(&data, delta_head+sizeof(delta_head));
1265 /* Read the result size */
1266 return get_delta_hdr_size(&data, delta_head+sizeof(delta_head));
1269 static off_t get_delta_base(struct packed_git *p,
1270 struct pack_window **w_curs,
1271 off_t *curpos,
1272 enum object_type type,
1273 off_t delta_obj_offset)
1275 unsigned char *base_info = use_pack(p, w_curs, *curpos, NULL);
1276 off_t base_offset;
1278 /* use_pack() assured us we have [base_info, base_info + 20)
1279 * as a range that we can look at without walking off the
1280 * end of the mapped window. Its actually the hash size
1281 * that is assured. An OFS_DELTA longer than the hash size
1282 * is stupid, as then a REF_DELTA would be smaller to store.
1284 if (type == OBJ_OFS_DELTA) {
1285 unsigned used = 0;
1286 unsigned char c = base_info[used++];
1287 base_offset = c & 127;
1288 while (c & 128) {
1289 base_offset += 1;
1290 if (!base_offset || MSB(base_offset, 7))
1291 die("offset value overflow for delta base object");
1292 c = base_info[used++];
1293 base_offset = (base_offset << 7) + (c & 127);
1295 base_offset = delta_obj_offset - base_offset;
1296 if (base_offset >= delta_obj_offset)
1297 die("delta base offset out of bound");
1298 *curpos += used;
1299 } else if (type == OBJ_REF_DELTA) {
1300 /* The base entry _must_ be in the same pack */
1301 base_offset = find_pack_entry_one(base_info, p);
1302 if (!base_offset)
1303 die("failed to find delta-pack base object %s",
1304 sha1_to_hex(base_info));
1305 *curpos += 20;
1306 } else
1307 die("I am totally screwed");
1308 return base_offset;
1311 /* forward declaration for a mutually recursive function */
1312 static int packed_object_info(struct packed_git *p, off_t offset,
1313 unsigned long *sizep);
1315 static int packed_delta_info(struct packed_git *p,
1316 struct pack_window **w_curs,
1317 off_t curpos,
1318 enum object_type type,
1319 off_t obj_offset,
1320 unsigned long *sizep)
1322 off_t base_offset;
1324 base_offset = get_delta_base(p, w_curs, &curpos, type, obj_offset);
1325 type = packed_object_info(p, base_offset, NULL);
1327 /* We choose to only get the type of the base object and
1328 * ignore potentially corrupt pack file that expects the delta
1329 * based on a base with a wrong size. This saves tons of
1330 * inflate() calls.
1332 if (sizep)
1333 *sizep = get_size_from_delta(p, w_curs, curpos);
1335 return type;
1338 static int unpack_object_header(struct packed_git *p,
1339 struct pack_window **w_curs,
1340 off_t *curpos,
1341 unsigned long *sizep)
1343 unsigned char *base;
1344 unsigned int left;
1345 unsigned long used;
1346 enum object_type type;
1348 /* use_pack() assures us we have [base, base + 20) available
1349 * as a range that we can look at at. (Its actually the hash
1350 * size that is assured.) With our object header encoding
1351 * the maximum deflated object size is 2^137, which is just
1352 * insane, so we know won't exceed what we have been given.
1354 base = use_pack(p, w_curs, *curpos, &left);
1355 used = unpack_object_header_gently(base, left, &type, sizep);
1356 if (!used)
1357 die("object offset outside of pack file");
1358 *curpos += used;
1360 return type;
1363 const char *packed_object_info_detail(struct packed_git *p,
1364 off_t obj_offset,
1365 unsigned long *size,
1366 unsigned long *store_size,
1367 unsigned int *delta_chain_length,
1368 unsigned char *base_sha1)
1370 struct pack_window *w_curs = NULL;
1371 off_t curpos;
1372 unsigned long dummy;
1373 unsigned char *next_sha1;
1374 enum object_type type;
1375 struct revindex_entry *revidx;
1377 *delta_chain_length = 0;
1378 curpos = obj_offset;
1379 type = unpack_object_header(p, &w_curs, &curpos, size);
1381 revidx = find_pack_revindex(p, obj_offset);
1382 *store_size = revidx[1].offset - obj_offset;
1384 for (;;) {
1385 switch (type) {
1386 default:
1387 die("pack %s contains unknown object type %d",
1388 p->pack_name, type);
1389 case OBJ_COMMIT:
1390 case OBJ_TREE:
1391 case OBJ_BLOB:
1392 case OBJ_TAG:
1393 unuse_pack(&w_curs);
1394 return typename(type);
1395 case OBJ_OFS_DELTA:
1396 obj_offset = get_delta_base(p, &w_curs, &curpos, type, obj_offset);
1397 if (*delta_chain_length == 0) {
1398 revidx = find_pack_revindex(p, obj_offset);
1399 hashcpy(base_sha1, nth_packed_object_sha1(p, revidx->nr));
1401 break;
1402 case OBJ_REF_DELTA:
1403 next_sha1 = use_pack(p, &w_curs, curpos, NULL);
1404 if (*delta_chain_length == 0)
1405 hashcpy(base_sha1, next_sha1);
1406 obj_offset = find_pack_entry_one(next_sha1, p);
1407 break;
1409 (*delta_chain_length)++;
1410 curpos = obj_offset;
1411 type = unpack_object_header(p, &w_curs, &curpos, &dummy);
1415 static int packed_object_info(struct packed_git *p, off_t obj_offset,
1416 unsigned long *sizep)
1418 struct pack_window *w_curs = NULL;
1419 unsigned long size;
1420 off_t curpos = obj_offset;
1421 enum object_type type;
1423 type = unpack_object_header(p, &w_curs, &curpos, &size);
1425 switch (type) {
1426 case OBJ_OFS_DELTA:
1427 case OBJ_REF_DELTA:
1428 type = packed_delta_info(p, &w_curs, curpos,
1429 type, obj_offset, sizep);
1430 break;
1431 case OBJ_COMMIT:
1432 case OBJ_TREE:
1433 case OBJ_BLOB:
1434 case OBJ_TAG:
1435 if (sizep)
1436 *sizep = size;
1437 break;
1438 default:
1439 die("pack %s contains unknown object type %d",
1440 p->pack_name, type);
1442 unuse_pack(&w_curs);
1443 return type;
1446 static void *unpack_compressed_entry(struct packed_git *p,
1447 struct pack_window **w_curs,
1448 off_t curpos,
1449 unsigned long size)
1451 int st;
1452 z_stream stream;
1453 unsigned char *buffer, *in;
1455 buffer = xmalloc(size + 1);
1456 buffer[size] = 0;
1457 memset(&stream, 0, sizeof(stream));
1458 stream.next_out = buffer;
1459 stream.avail_out = size;
1461 inflateInit(&stream);
1462 do {
1463 in = use_pack(p, w_curs, curpos, &stream.avail_in);
1464 stream.next_in = in;
1465 st = inflate(&stream, Z_FINISH);
1466 curpos += stream.next_in - in;
1467 } while (st == Z_OK || st == Z_BUF_ERROR);
1468 inflateEnd(&stream);
1469 if ((st != Z_STREAM_END) || stream.total_out != size) {
1470 free(buffer);
1471 return NULL;
1474 return buffer;
1477 #define MAX_DELTA_CACHE (256)
1479 static size_t delta_base_cached;
1481 static struct delta_base_cache_lru_list {
1482 struct delta_base_cache_lru_list *prev;
1483 struct delta_base_cache_lru_list *next;
1484 } delta_base_cache_lru = { &delta_base_cache_lru, &delta_base_cache_lru };
1486 static struct delta_base_cache_entry {
1487 struct delta_base_cache_lru_list lru;
1488 void *data;
1489 struct packed_git *p;
1490 off_t base_offset;
1491 unsigned long size;
1492 enum object_type type;
1493 } delta_base_cache[MAX_DELTA_CACHE];
1495 static unsigned long pack_entry_hash(struct packed_git *p, off_t base_offset)
1497 unsigned long hash;
1499 hash = (unsigned long)p + (unsigned long)base_offset;
1500 hash += (hash >> 8) + (hash >> 16);
1501 return hash % MAX_DELTA_CACHE;
1504 static void *cache_or_unpack_entry(struct packed_git *p, off_t base_offset,
1505 unsigned long *base_size, enum object_type *type, int keep_cache)
1507 void *ret;
1508 unsigned long hash = pack_entry_hash(p, base_offset);
1509 struct delta_base_cache_entry *ent = delta_base_cache + hash;
1511 ret = ent->data;
1512 if (ret && ent->p == p && ent->base_offset == base_offset)
1513 goto found_cache_entry;
1514 return unpack_entry(p, base_offset, type, base_size);
1516 found_cache_entry:
1517 if (!keep_cache) {
1518 ent->data = NULL;
1519 ent->lru.next->prev = ent->lru.prev;
1520 ent->lru.prev->next = ent->lru.next;
1521 delta_base_cached -= ent->size;
1522 } else {
1523 ret = xmemdupz(ent->data, ent->size);
1525 *type = ent->type;
1526 *base_size = ent->size;
1527 return ret;
1530 static inline void release_delta_base_cache(struct delta_base_cache_entry *ent)
1532 if (ent->data) {
1533 free(ent->data);
1534 ent->data = NULL;
1535 ent->lru.next->prev = ent->lru.prev;
1536 ent->lru.prev->next = ent->lru.next;
1537 delta_base_cached -= ent->size;
1541 static void add_delta_base_cache(struct packed_git *p, off_t base_offset,
1542 void *base, unsigned long base_size, enum object_type type)
1544 unsigned long hash = pack_entry_hash(p, base_offset);
1545 struct delta_base_cache_entry *ent = delta_base_cache + hash;
1546 struct delta_base_cache_lru_list *lru;
1548 release_delta_base_cache(ent);
1549 delta_base_cached += base_size;
1551 for (lru = delta_base_cache_lru.next;
1552 delta_base_cached > delta_base_cache_limit
1553 && lru != &delta_base_cache_lru;
1554 lru = lru->next) {
1555 struct delta_base_cache_entry *f = (void *)lru;
1556 if (f->type == OBJ_BLOB)
1557 release_delta_base_cache(f);
1559 for (lru = delta_base_cache_lru.next;
1560 delta_base_cached > delta_base_cache_limit
1561 && lru != &delta_base_cache_lru;
1562 lru = lru->next) {
1563 struct delta_base_cache_entry *f = (void *)lru;
1564 release_delta_base_cache(f);
1567 ent->p = p;
1568 ent->base_offset = base_offset;
1569 ent->type = type;
1570 ent->data = base;
1571 ent->size = base_size;
1572 ent->lru.next = &delta_base_cache_lru;
1573 ent->lru.prev = delta_base_cache_lru.prev;
1574 delta_base_cache_lru.prev->next = &ent->lru;
1575 delta_base_cache_lru.prev = &ent->lru;
1578 static void *unpack_delta_entry(struct packed_git *p,
1579 struct pack_window **w_curs,
1580 off_t curpos,
1581 unsigned long delta_size,
1582 off_t obj_offset,
1583 enum object_type *type,
1584 unsigned long *sizep)
1586 void *delta_data, *result, *base;
1587 unsigned long base_size;
1588 off_t base_offset;
1590 base_offset = get_delta_base(p, w_curs, &curpos, *type, obj_offset);
1591 base = cache_or_unpack_entry(p, base_offset, &base_size, type, 0);
1592 if (!base)
1593 die("failed to read delta base object"
1594 " at %"PRIuMAX" from %s",
1595 (uintmax_t)base_offset, p->pack_name);
1597 delta_data = unpack_compressed_entry(p, w_curs, curpos, delta_size);
1598 if (!delta_data)
1599 die("failed to unpack compressed delta"
1600 " at %"PRIuMAX" from %s",
1601 (uintmax_t)curpos, p->pack_name);
1602 result = patch_delta(base, base_size,
1603 delta_data, delta_size,
1604 sizep);
1605 if (!result)
1606 die("failed to apply delta");
1607 free(delta_data);
1608 add_delta_base_cache(p, base_offset, base, base_size, *type);
1609 return result;
1612 void *unpack_entry(struct packed_git *p, off_t obj_offset,
1613 enum object_type *type, unsigned long *sizep)
1615 struct pack_window *w_curs = NULL;
1616 off_t curpos = obj_offset;
1617 void *data;
1619 *type = unpack_object_header(p, &w_curs, &curpos, sizep);
1620 switch (*type) {
1621 case OBJ_OFS_DELTA:
1622 case OBJ_REF_DELTA:
1623 data = unpack_delta_entry(p, &w_curs, curpos, *sizep,
1624 obj_offset, type, sizep);
1625 break;
1626 case OBJ_COMMIT:
1627 case OBJ_TREE:
1628 case OBJ_BLOB:
1629 case OBJ_TAG:
1630 data = unpack_compressed_entry(p, &w_curs, curpos, *sizep);
1631 break;
1632 default:
1633 die("unknown object type %i in %s", *type, p->pack_name);
1635 unuse_pack(&w_curs);
1636 return data;
1639 const unsigned char *nth_packed_object_sha1(struct packed_git *p,
1640 uint32_t n)
1642 const unsigned char *index = p->index_data;
1643 if (!index) {
1644 if (open_pack_index(p))
1645 return NULL;
1646 index = p->index_data;
1648 if (n >= p->num_objects)
1649 return NULL;
1650 index += 4 * 256;
1651 if (p->index_version == 1) {
1652 return index + 24 * n + 4;
1653 } else {
1654 index += 8;
1655 return index + 20 * n;
1659 static off_t nth_packed_object_offset(const struct packed_git *p, uint32_t n)
1661 const unsigned char *index = p->index_data;
1662 index += 4 * 256;
1663 if (p->index_version == 1) {
1664 return ntohl(*((uint32_t *)(index + 24 * n)));
1665 } else {
1666 uint32_t off;
1667 index += 8 + p->num_objects * (20 + 4);
1668 off = ntohl(*((uint32_t *)(index + 4 * n)));
1669 if (!(off & 0x80000000))
1670 return off;
1671 index += p->num_objects * 4 + (off & 0x7fffffff) * 8;
1672 return (((uint64_t)ntohl(*((uint32_t *)(index + 0)))) << 32) |
1673 ntohl(*((uint32_t *)(index + 4)));
1677 off_t find_pack_entry_one(const unsigned char *sha1,
1678 struct packed_git *p)
1680 const uint32_t *level1_ofs = p->index_data;
1681 const unsigned char *index = p->index_data;
1682 unsigned hi, lo, stride;
1683 static int use_lookup = -1;
1684 static int debug_lookup = -1;
1686 if (debug_lookup < 0)
1687 debug_lookup = !!getenv("GIT_DEBUG_LOOKUP");
1689 if (!index) {
1690 if (open_pack_index(p))
1691 return 0;
1692 level1_ofs = p->index_data;
1693 index = p->index_data;
1695 if (p->index_version > 1) {
1696 level1_ofs += 2;
1697 index += 8;
1699 index += 4 * 256;
1700 hi = ntohl(level1_ofs[*sha1]);
1701 lo = ((*sha1 == 0x0) ? 0 : ntohl(level1_ofs[*sha1 - 1]));
1702 if (p->index_version > 1) {
1703 stride = 20;
1704 } else {
1705 stride = 24;
1706 index += 4;
1709 if (debug_lookup)
1710 printf("%02x%02x%02x... lo %u hi %u nr %u\n",
1711 sha1[0], sha1[1], sha1[2], lo, hi, p->num_objects);
1713 if (use_lookup < 0)
1714 use_lookup = !!getenv("GIT_USE_LOOKUP");
1715 if (use_lookup) {
1716 int pos = sha1_entry_pos(index, stride, 0,
1717 lo, hi, p->num_objects, sha1);
1718 if (pos < 0)
1719 return 0;
1720 return nth_packed_object_offset(p, pos);
1723 do {
1724 unsigned mi = (lo + hi) / 2;
1725 int cmp = hashcmp(index + mi * stride, sha1);
1727 if (debug_lookup)
1728 printf("lo %u hi %u rg %u mi %u\n",
1729 lo, hi, hi - lo, mi);
1730 if (!cmp)
1731 return nth_packed_object_offset(p, mi);
1732 if (cmp > 0)
1733 hi = mi;
1734 else
1735 lo = mi+1;
1736 } while (lo < hi);
1737 return 0;
1740 int matches_pack_name(struct packed_git *p, const char *name)
1742 const char *last_c, *c;
1744 if (!strcmp(p->pack_name, name))
1745 return 1;
1747 for (c = p->pack_name, last_c = c; *c;)
1748 if (*c == '/')
1749 last_c = ++c;
1750 else
1751 ++c;
1752 if (!strcmp(last_c, name))
1753 return 1;
1755 return 0;
1758 static int find_pack_entry(const unsigned char *sha1, struct pack_entry *e, const char **ignore_packed)
1760 static struct packed_git *last_found = (void *)1;
1761 struct packed_git *p;
1762 off_t offset;
1764 prepare_packed_git();
1765 if (!packed_git)
1766 return 0;
1767 p = (last_found == (void *)1) ? packed_git : last_found;
1769 do {
1770 if (ignore_packed) {
1771 const char **ig;
1772 for (ig = ignore_packed; *ig; ig++)
1773 if (matches_pack_name(p, *ig))
1774 break;
1775 if (*ig)
1776 goto next;
1779 offset = find_pack_entry_one(sha1, p);
1780 if (offset) {
1782 * We are about to tell the caller where they can
1783 * locate the requested object. We better make
1784 * sure the packfile is still here and can be
1785 * accessed before supplying that answer, as
1786 * it may have been deleted since the index
1787 * was loaded!
1789 if (p->pack_fd == -1 && open_packed_git(p)) {
1790 error("packfile %s cannot be accessed", p->pack_name);
1791 goto next;
1793 e->offset = offset;
1794 e->p = p;
1795 hashcpy(e->sha1, sha1);
1796 last_found = p;
1797 return 1;
1800 next:
1801 if (p == last_found)
1802 p = packed_git;
1803 else
1804 p = p->next;
1805 if (p == last_found)
1806 p = p->next;
1807 } while (p);
1808 return 0;
1811 struct packed_git *find_sha1_pack(const unsigned char *sha1,
1812 struct packed_git *packs)
1814 struct packed_git *p;
1816 for (p = packs; p; p = p->next) {
1817 if (find_pack_entry_one(sha1, p))
1818 return p;
1820 return NULL;
1824 static int sha1_loose_object_info(const unsigned char *sha1, unsigned long *sizep)
1826 int status;
1827 unsigned long mapsize, size;
1828 void *map;
1829 z_stream stream;
1830 char hdr[32];
1832 map = map_sha1_file(sha1, &mapsize);
1833 if (!map)
1834 return error("unable to find %s", sha1_to_hex(sha1));
1835 if (unpack_sha1_header(&stream, map, mapsize, hdr, sizeof(hdr)) < 0)
1836 status = error("unable to unpack %s header",
1837 sha1_to_hex(sha1));
1838 else if ((status = parse_sha1_header(hdr, &size)) < 0)
1839 status = error("unable to parse %s header", sha1_to_hex(sha1));
1840 else if (sizep)
1841 *sizep = size;
1842 inflateEnd(&stream);
1843 munmap(map, mapsize);
1844 return status;
1847 int sha1_object_info(const unsigned char *sha1, unsigned long *sizep)
1849 struct pack_entry e;
1851 if (!find_pack_entry(sha1, &e, NULL)) {
1852 reprepare_packed_git();
1853 if (!find_pack_entry(sha1, &e, NULL))
1854 return sha1_loose_object_info(sha1, sizep);
1856 return packed_object_info(e.p, e.offset, sizep);
1859 static void *read_packed_sha1(const unsigned char *sha1,
1860 enum object_type *type, unsigned long *size)
1862 struct pack_entry e;
1864 if (!find_pack_entry(sha1, &e, NULL))
1865 return NULL;
1866 else
1867 return cache_or_unpack_entry(e.p, e.offset, size, type, 1);
1871 * This is meant to hold a *small* number of objects that you would
1872 * want read_sha1_file() to be able to return, but yet you do not want
1873 * to write them into the object store (e.g. a browse-only
1874 * application).
1876 static struct cached_object {
1877 unsigned char sha1[20];
1878 enum object_type type;
1879 void *buf;
1880 unsigned long size;
1881 } *cached_objects;
1882 static int cached_object_nr, cached_object_alloc;
1884 static struct cached_object empty_tree = {
1885 /* empty tree sha1: 4b825dc642cb6eb9a060e54bf8d69288fbee4904 */
1886 "\x4b\x82\x5d\xc6\x42\xcb\x6e\xb9\xa0\x60"
1887 "\xe5\x4b\xf8\xd6\x92\x88\xfb\xee\x49\x04",
1888 OBJ_TREE,
1893 static struct cached_object *find_cached_object(const unsigned char *sha1)
1895 int i;
1896 struct cached_object *co = cached_objects;
1898 for (i = 0; i < cached_object_nr; i++, co++) {
1899 if (!hashcmp(co->sha1, sha1))
1900 return co;
1902 if (!hashcmp(sha1, empty_tree.sha1))
1903 return &empty_tree;
1904 return NULL;
1907 int pretend_sha1_file(void *buf, unsigned long len, enum object_type type,
1908 unsigned char *sha1)
1910 struct cached_object *co;
1912 hash_sha1_file(buf, len, typename(type), sha1);
1913 if (has_sha1_file(sha1) || find_cached_object(sha1))
1914 return 0;
1915 if (cached_object_alloc <= cached_object_nr) {
1916 cached_object_alloc = alloc_nr(cached_object_alloc);
1917 cached_objects = xrealloc(cached_objects,
1918 sizeof(*cached_objects) *
1919 cached_object_alloc);
1921 co = &cached_objects[cached_object_nr++];
1922 co->size = len;
1923 co->type = type;
1924 co->buf = xmalloc(len);
1925 memcpy(co->buf, buf, len);
1926 hashcpy(co->sha1, sha1);
1927 return 0;
1930 void *read_sha1_file(const unsigned char *sha1, enum object_type *type,
1931 unsigned long *size)
1933 unsigned long mapsize;
1934 void *map, *buf;
1935 struct cached_object *co;
1937 co = find_cached_object(sha1);
1938 if (co) {
1939 *type = co->type;
1940 *size = co->size;
1941 return xmemdupz(co->buf, co->size);
1944 buf = read_packed_sha1(sha1, type, size);
1945 if (buf)
1946 return buf;
1947 map = map_sha1_file(sha1, &mapsize);
1948 if (map) {
1949 buf = unpack_sha1_file(map, mapsize, type, size, sha1);
1950 munmap(map, mapsize);
1951 return buf;
1953 reprepare_packed_git();
1954 return read_packed_sha1(sha1, type, size);
1957 void *read_object_with_reference(const unsigned char *sha1,
1958 const char *required_type_name,
1959 unsigned long *size,
1960 unsigned char *actual_sha1_return)
1962 enum object_type type, required_type;
1963 void *buffer;
1964 unsigned long isize;
1965 unsigned char actual_sha1[20];
1967 required_type = type_from_string(required_type_name);
1968 hashcpy(actual_sha1, sha1);
1969 while (1) {
1970 int ref_length = -1;
1971 const char *ref_type = NULL;
1973 buffer = read_sha1_file(actual_sha1, &type, &isize);
1974 if (!buffer)
1975 return NULL;
1976 if (type == required_type) {
1977 *size = isize;
1978 if (actual_sha1_return)
1979 hashcpy(actual_sha1_return, actual_sha1);
1980 return buffer;
1982 /* Handle references */
1983 else if (type == OBJ_COMMIT)
1984 ref_type = "tree ";
1985 else if (type == OBJ_TAG)
1986 ref_type = "object ";
1987 else {
1988 free(buffer);
1989 return NULL;
1991 ref_length = strlen(ref_type);
1993 if (ref_length + 40 > isize ||
1994 memcmp(buffer, ref_type, ref_length) ||
1995 get_sha1_hex((char *) buffer + ref_length, actual_sha1)) {
1996 free(buffer);
1997 return NULL;
1999 free(buffer);
2000 /* Now we have the ID of the referred-to object in
2001 * actual_sha1. Check again. */
2005 static void write_sha1_file_prepare(const void *buf, unsigned long len,
2006 const char *type, unsigned char *sha1,
2007 char *hdr, int *hdrlen)
2009 SHA_CTX c;
2011 /* Generate the header */
2012 *hdrlen = sprintf(hdr, "%s %lu", type, len)+1;
2014 /* Sha1.. */
2015 SHA1_Init(&c);
2016 SHA1_Update(&c, hdr, *hdrlen);
2017 SHA1_Update(&c, buf, len);
2018 SHA1_Final(sha1, &c);
2022 * Link the tempfile to the final place, possibly creating the
2023 * last directory level as you do so.
2025 * Returns the errno on failure, 0 on success.
2027 static int link_temp_to_file(const char *tmpfile, const char *filename)
2029 int ret;
2030 char *dir;
2032 if (!link(tmpfile, filename))
2033 return 0;
2036 * Try to mkdir the last path component if that failed.
2038 * Re-try the "link()" regardless of whether the mkdir
2039 * succeeds, since a race might mean that somebody
2040 * else succeeded.
2042 ret = errno;
2043 dir = strrchr(filename, '/');
2044 if (dir) {
2045 *dir = 0;
2046 if (!mkdir(filename, 0777) && adjust_shared_perm(filename)) {
2047 *dir = '/';
2048 return -2;
2050 *dir = '/';
2051 if (!link(tmpfile, filename))
2052 return 0;
2053 ret = errno;
2055 return ret;
2059 * Move the just written object into its final resting place
2061 int move_temp_to_file(const char *tmpfile, const char *filename)
2063 int ret = link_temp_to_file(tmpfile, filename);
2066 * Coda hack - coda doesn't like cross-directory links,
2067 * so we fall back to a rename, which will mean that it
2068 * won't be able to check collisions, but that's not a
2069 * big deal.
2071 * The same holds for FAT formatted media.
2073 * When this succeeds, we just return 0. We have nothing
2074 * left to unlink.
2076 if (ret && ret != EEXIST) {
2077 if (!rename(tmpfile, filename))
2078 return 0;
2079 ret = errno;
2081 unlink(tmpfile);
2082 if (ret) {
2083 if (ret != EEXIST) {
2084 return error("unable to write sha1 filename %s: %s\n", filename, strerror(ret));
2086 /* FIXME!!! Collision check here ? */
2089 return 0;
2092 static int write_buffer(int fd, const void *buf, size_t len)
2094 if (write_in_full(fd, buf, len) < 0)
2095 return error("file write error (%s)", strerror(errno));
2096 return 0;
2099 int hash_sha1_file(const void *buf, unsigned long len, const char *type,
2100 unsigned char *sha1)
2102 char hdr[32];
2103 int hdrlen;
2104 write_sha1_file_prepare(buf, len, type, sha1, hdr, &hdrlen);
2105 return 0;
2108 static int write_loose_object(const unsigned char *sha1, char *hdr, int hdrlen,
2109 void *buf, unsigned long len, time_t mtime)
2111 int fd, size, ret;
2112 unsigned char *compressed;
2113 z_stream stream;
2114 char *filename;
2115 static char tmpfile[PATH_MAX];
2117 filename = sha1_file_name(sha1);
2118 fd = open(filename, O_RDONLY);
2119 if (fd >= 0) {
2121 * FIXME!!! We might do collision checking here, but we'd
2122 * need to uncompress the old file and check it. Later.
2124 close(fd);
2125 return 0;
2128 if (errno != ENOENT) {
2129 return error("sha1 file %s: %s\n", filename, strerror(errno));
2132 snprintf(tmpfile, sizeof(tmpfile), "%s/tmp_obj_XXXXXX", get_object_directory());
2134 fd = mkstemp(tmpfile);
2135 if (fd < 0) {
2136 if (errno == EPERM)
2137 return error("insufficient permission for adding an object to repository database %s\n", get_object_directory());
2138 else
2139 return error("unable to create temporary sha1 filename %s: %s\n", tmpfile, strerror(errno));
2142 /* Set it up */
2143 memset(&stream, 0, sizeof(stream));
2144 deflateInit(&stream, zlib_compression_level);
2145 size = 8 + deflateBound(&stream, len+hdrlen);
2146 compressed = xmalloc(size);
2148 /* Compress it */
2149 stream.next_out = compressed;
2150 stream.avail_out = size;
2152 /* First header.. */
2153 stream.next_in = (unsigned char *)hdr;
2154 stream.avail_in = hdrlen;
2155 while (deflate(&stream, 0) == Z_OK)
2156 /* nothing */;
2158 /* Then the data itself.. */
2159 stream.next_in = buf;
2160 stream.avail_in = len;
2161 ret = deflate(&stream, Z_FINISH);
2162 if (ret != Z_STREAM_END)
2163 die("unable to deflate new object %s (%d)", sha1_to_hex(sha1), ret);
2165 ret = deflateEnd(&stream);
2166 if (ret != Z_OK)
2167 die("deflateEnd on object %s failed (%d)", sha1_to_hex(sha1), ret);
2169 size = stream.total_out;
2171 if (write_buffer(fd, compressed, size) < 0)
2172 die("unable to write sha1 file");
2173 fchmod(fd, 0444);
2174 if (close(fd))
2175 die("unable to write sha1 file");
2176 free(compressed);
2178 if (mtime) {
2179 struct utimbuf utb;
2180 utb.actime = mtime;
2181 utb.modtime = mtime;
2182 if (utime(tmpfile, &utb) < 0)
2183 warning("failed utime() on %s: %s",
2184 tmpfile, strerror(errno));
2187 return move_temp_to_file(tmpfile, filename);
2190 int write_sha1_file(void *buf, unsigned long len, const char *type, unsigned char *returnsha1)
2192 unsigned char sha1[20];
2193 char hdr[32];
2194 int hdrlen;
2196 /* Normally if we have it in the pack then we do not bother writing
2197 * it out into .git/objects/??/?{38} file.
2199 write_sha1_file_prepare(buf, len, type, sha1, hdr, &hdrlen);
2200 if (returnsha1)
2201 hashcpy(returnsha1, sha1);
2202 if (has_sha1_file(sha1))
2203 return 0;
2204 return write_loose_object(sha1, hdr, hdrlen, buf, len, 0);
2207 int force_object_loose(const unsigned char *sha1, time_t mtime)
2209 struct stat st;
2210 void *buf;
2211 unsigned long len;
2212 enum object_type type;
2213 char hdr[32];
2214 int hdrlen;
2216 if (find_sha1_file(sha1, &st))
2217 return 0;
2218 buf = read_packed_sha1(sha1, &type, &len);
2219 if (!buf)
2220 return error("cannot read sha1_file for %s", sha1_to_hex(sha1));
2221 hdrlen = sprintf(hdr, "%s %lu", typename(type), len) + 1;
2222 return write_loose_object(sha1, hdr, hdrlen, buf, len, mtime);
2226 * We need to unpack and recompress the object for writing
2227 * it out to a different file.
2229 static void *repack_object(const unsigned char *sha1, unsigned long *objsize)
2231 size_t size;
2232 z_stream stream;
2233 unsigned char *unpacked;
2234 unsigned long len;
2235 enum object_type type;
2236 char hdr[32];
2237 int hdrlen;
2238 void *buf;
2240 /* need to unpack and recompress it by itself */
2241 unpacked = read_packed_sha1(sha1, &type, &len);
2242 if (!unpacked)
2243 error("cannot read sha1_file for %s", sha1_to_hex(sha1));
2245 hdrlen = sprintf(hdr, "%s %lu", typename(type), len) + 1;
2247 /* Set it up */
2248 memset(&stream, 0, sizeof(stream));
2249 deflateInit(&stream, zlib_compression_level);
2250 size = deflateBound(&stream, len + hdrlen);
2251 buf = xmalloc(size);
2253 /* Compress it */
2254 stream.next_out = buf;
2255 stream.avail_out = size;
2257 /* First header.. */
2258 stream.next_in = (void *)hdr;
2259 stream.avail_in = hdrlen;
2260 while (deflate(&stream, 0) == Z_OK)
2261 /* nothing */;
2263 /* Then the data itself.. */
2264 stream.next_in = unpacked;
2265 stream.avail_in = len;
2266 while (deflate(&stream, Z_FINISH) == Z_OK)
2267 /* nothing */;
2268 deflateEnd(&stream);
2269 free(unpacked);
2271 *objsize = stream.total_out;
2272 return buf;
2275 int write_sha1_to_fd(int fd, const unsigned char *sha1)
2277 int retval;
2278 unsigned long objsize;
2279 void *buf = map_sha1_file(sha1, &objsize);
2281 if (buf) {
2282 retval = write_buffer(fd, buf, objsize);
2283 munmap(buf, objsize);
2284 return retval;
2287 buf = repack_object(sha1, &objsize);
2288 retval = write_buffer(fd, buf, objsize);
2289 free(buf);
2290 return retval;
2293 int write_sha1_from_fd(const unsigned char *sha1, int fd, char *buffer,
2294 size_t bufsize, size_t *bufposn)
2296 char tmpfile[PATH_MAX];
2297 int local;
2298 z_stream stream;
2299 unsigned char real_sha1[20];
2300 unsigned char discard[4096];
2301 int ret;
2302 SHA_CTX c;
2304 snprintf(tmpfile, sizeof(tmpfile), "%s/tmp_obj_XXXXXX", get_object_directory());
2306 local = mkstemp(tmpfile);
2307 if (local < 0) {
2308 if (errno == EPERM)
2309 return error("insufficient permission for adding an object to repository database %s\n", get_object_directory());
2310 else
2311 return error("unable to create temporary sha1 filename %s: %s\n", tmpfile, strerror(errno));
2314 memset(&stream, 0, sizeof(stream));
2316 inflateInit(&stream);
2318 SHA1_Init(&c);
2320 do {
2321 ssize_t size;
2322 if (*bufposn) {
2323 stream.avail_in = *bufposn;
2324 stream.next_in = (unsigned char *) buffer;
2325 do {
2326 stream.next_out = discard;
2327 stream.avail_out = sizeof(discard);
2328 ret = inflate(&stream, Z_SYNC_FLUSH);
2329 SHA1_Update(&c, discard, sizeof(discard) -
2330 stream.avail_out);
2331 } while (stream.avail_in && ret == Z_OK);
2332 if (write_buffer(local, buffer, *bufposn - stream.avail_in) < 0)
2333 die("unable to write sha1 file");
2334 memmove(buffer, buffer + *bufposn - stream.avail_in,
2335 stream.avail_in);
2336 *bufposn = stream.avail_in;
2337 if (ret != Z_OK)
2338 break;
2340 size = xread(fd, buffer + *bufposn, bufsize - *bufposn);
2341 if (size <= 0) {
2342 close(local);
2343 unlink(tmpfile);
2344 if (!size)
2345 return error("Connection closed?");
2346 perror("Reading from connection");
2347 return -1;
2349 *bufposn += size;
2350 } while (1);
2351 inflateEnd(&stream);
2353 fchmod(local, 0444);
2354 if (close(local) != 0)
2355 die("unable to write sha1 file");
2356 SHA1_Final(real_sha1, &c);
2357 if (ret != Z_STREAM_END) {
2358 unlink(tmpfile);
2359 return error("File %s corrupted", sha1_to_hex(sha1));
2361 if (hashcmp(sha1, real_sha1)) {
2362 unlink(tmpfile);
2363 return error("File %s has bad hash", sha1_to_hex(sha1));
2366 return move_temp_to_file(tmpfile, sha1_file_name(sha1));
2369 int has_pack_index(const unsigned char *sha1)
2371 struct stat st;
2372 if (stat(sha1_pack_index_name(sha1), &st))
2373 return 0;
2374 return 1;
2377 int has_pack_file(const unsigned char *sha1)
2379 struct stat st;
2380 if (stat(sha1_pack_name(sha1), &st))
2381 return 0;
2382 return 1;
2385 int has_sha1_pack(const unsigned char *sha1, const char **ignore_packed)
2387 struct pack_entry e;
2388 return find_pack_entry(sha1, &e, ignore_packed);
2391 int has_sha1_file(const unsigned char *sha1)
2393 struct stat st;
2394 struct pack_entry e;
2396 if (find_pack_entry(sha1, &e, NULL))
2397 return 1;
2398 return find_sha1_file(sha1, &st) ? 1 : 0;
2401 int index_pipe(unsigned char *sha1, int fd, const char *type, int write_object)
2403 struct strbuf buf;
2404 int ret;
2406 strbuf_init(&buf, 0);
2407 if (strbuf_read(&buf, fd, 4096) < 0) {
2408 strbuf_release(&buf);
2409 return -1;
2412 if (!type)
2413 type = blob_type;
2414 if (write_object)
2415 ret = write_sha1_file(buf.buf, buf.len, type, sha1);
2416 else
2417 ret = hash_sha1_file(buf.buf, buf.len, type, sha1);
2418 strbuf_release(&buf);
2420 return ret;
2423 int index_fd(unsigned char *sha1, int fd, struct stat *st, int write_object,
2424 enum object_type type, const char *path)
2426 size_t size = xsize_t(st->st_size);
2427 void *buf = NULL;
2428 int ret, re_allocated = 0;
2430 if (size)
2431 buf = xmmap(NULL, size, PROT_READ, MAP_PRIVATE, fd, 0);
2432 close(fd);
2434 if (!type)
2435 type = OBJ_BLOB;
2438 * Convert blobs to git internal format
2440 if ((type == OBJ_BLOB) && S_ISREG(st->st_mode)) {
2441 struct strbuf nbuf;
2442 strbuf_init(&nbuf, 0);
2443 if (convert_to_git(path, buf, size, &nbuf,
2444 write_object ? safe_crlf : 0)) {
2445 munmap(buf, size);
2446 buf = strbuf_detach(&nbuf, &size);
2447 re_allocated = 1;
2451 if (write_object)
2452 ret = write_sha1_file(buf, size, typename(type), sha1);
2453 else
2454 ret = hash_sha1_file(buf, size, typename(type), sha1);
2455 if (re_allocated) {
2456 free(buf);
2457 return ret;
2459 if (size)
2460 munmap(buf, size);
2461 return ret;
2464 int index_path(unsigned char *sha1, const char *path, struct stat *st, int write_object)
2466 int fd;
2467 char *target;
2468 size_t len;
2470 switch (st->st_mode & S_IFMT) {
2471 case S_IFREG:
2472 fd = open(path, O_RDONLY);
2473 if (fd < 0)
2474 return error("open(\"%s\"): %s", path,
2475 strerror(errno));
2476 if (index_fd(sha1, fd, st, write_object, OBJ_BLOB, path) < 0)
2477 return error("%s: failed to insert into database",
2478 path);
2479 break;
2480 case S_IFLNK:
2481 len = xsize_t(st->st_size);
2482 target = xmalloc(len + 1);
2483 if (readlink(path, target, len + 1) != st->st_size) {
2484 char *errstr = strerror(errno);
2485 free(target);
2486 return error("readlink(\"%s\"): %s", path,
2487 errstr);
2489 if (!write_object)
2490 hash_sha1_file(target, len, blob_type, sha1);
2491 else if (write_sha1_file(target, len, blob_type, sha1))
2492 return error("%s: failed to insert into database",
2493 path);
2494 free(target);
2495 break;
2496 case S_IFDIR:
2497 return resolve_gitlink_ref(path, "HEAD", sha1);
2498 default:
2499 return error("%s: unsupported file type", path);
2501 return 0;
2504 int read_pack_header(int fd, struct pack_header *header)
2506 if (read_in_full(fd, header, sizeof(*header)) < sizeof(*header))
2507 /* "eof before pack header was fully read" */
2508 return PH_ERROR_EOF;
2510 if (header->hdr_signature != htonl(PACK_SIGNATURE))
2511 /* "protocol error (pack signature mismatch detected)" */
2512 return PH_ERROR_PACK_SIGNATURE;
2513 if (!pack_version_ok(header->hdr_version))
2514 /* "protocol error (pack version unsupported)" */
2515 return PH_ERROR_PROTOCOL;
2516 return 0;