Merge branch 'maint'
[git/git.git] / sha1_file.c
1 /*
2 * GIT - The information manager from hell
3 *
4 * Copyright (C) Linus Torvalds, 2005
5 *
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
17 #ifndef O_NOATIME
18 #if defined(__linux__) && (defined(__i386__) || defined(__PPC__))
19 #define O_NOATIME 01000000
20 #else
21 #define O_NOATIME 0
22 #endif
23 #endif
24
25 const unsigned char null_sha1[20] = { 0, };
26
27 static unsigned int sha1_file_open_flag = O_NOATIME;
28
29 static unsigned hexval(char c)
30 {
31 if (c >= '0' && c <= '9')
32 return c - '0';
33 if (c >= 'a' && c <= 'f')
34 return c - 'a' + 10;
35 if (c >= 'A' && c <= 'F')
36 return c - 'A' + 10;
37 return ~0;
38 }
39
40 int get_sha1_hex(const char *hex, unsigned char *sha1)
41 {
42 int i;
43 for (i = 0; i < 20; i++) {
44 unsigned int val = (hexval(hex[0]) << 4) | hexval(hex[1]);
45 if (val & ~0xff)
46 return -1;
47 *sha1++ = val;
48 hex += 2;
49 }
50 return 0;
51 }
52
53 int adjust_shared_perm(const char *path)
54 {
55 struct stat st;
56 int mode;
57
58 if (!shared_repository)
59 return 0;
60 if (lstat(path, &st) < 0)
61 return -1;
62 mode = st.st_mode;
63 if (mode & S_IRUSR)
64 mode |= S_IRGRP;
65 if (mode & S_IWUSR)
66 mode |= S_IWGRP;
67 if (mode & S_IXUSR)
68 mode |= S_IXGRP;
69 if (S_ISDIR(mode))
70 mode |= S_ISGID;
71 if (chmod(path, mode) < 0)
72 return -2;
73 return 0;
74 }
75
76 int safe_create_leading_directories(char *path)
77 {
78 char *pos = path;
79 struct stat st;
80
81 if (*pos == '/')
82 pos++;
83
84 while (pos) {
85 pos = strchr(pos, '/');
86 if (!pos)
87 break;
88 *pos = 0;
89 if (!stat(path, &st)) {
90 /* path exists */
91 if (!S_ISDIR(st.st_mode)) {
92 *pos = '/';
93 return -3;
94 }
95 }
96 else if (mkdir(path, 0777)) {
97 *pos = '/';
98 return -1;
99 }
100 else if (adjust_shared_perm(path)) {
101 *pos = '/';
102 return -2;
103 }
104 *pos++ = '/';
105 }
106 return 0;
107 }
108
109 char * sha1_to_hex(const unsigned char *sha1)
110 {
111 static char buffer[50];
112 static const char hex[] = "0123456789abcdef";
113 char *buf = buffer;
114 int i;
115
116 for (i = 0; i < 20; i++) {
117 unsigned int val = *sha1++;
118 *buf++ = hex[val >> 4];
119 *buf++ = hex[val & 0xf];
120 }
121 *buf = '\0';
122
123 return buffer;
124 }
125
126 static void fill_sha1_path(char *pathbuf, const unsigned char *sha1)
127 {
128 int i;
129 for (i = 0; i < 20; i++) {
130 static char hex[] = "0123456789abcdef";
131 unsigned int val = sha1[i];
132 char *pos = pathbuf + i*2 + (i > 0);
133 *pos++ = hex[val >> 4];
134 *pos = hex[val & 0xf];
135 }
136 }
137
138 /*
139 * NOTE! This returns a statically allocated buffer, so you have to be
140 * careful about using it. Do a "strdup()" if you need to save the
141 * filename.
142 *
143 * Also note that this returns the location for creating. Reading
144 * SHA1 file can happen from any alternate directory listed in the
145 * DB_ENVIRONMENT environment variable if it is not found in
146 * the primary object database.
147 */
148 char *sha1_file_name(const unsigned char *sha1)
149 {
150 static char *name, *base;
151
152 if (!base) {
153 const char *sha1_file_directory = get_object_directory();
154 int len = strlen(sha1_file_directory);
155 base = xmalloc(len + 60);
156 memcpy(base, sha1_file_directory, len);
157 memset(base+len, 0, 60);
158 base[len] = '/';
159 base[len+3] = '/';
160 name = base + len + 1;
161 }
162 fill_sha1_path(name, sha1);
163 return base;
164 }
165
166 char *sha1_pack_name(const unsigned char *sha1)
167 {
168 static const char hex[] = "0123456789abcdef";
169 static char *name, *base, *buf;
170 int i;
171
172 if (!base) {
173 const char *sha1_file_directory = get_object_directory();
174 int len = strlen(sha1_file_directory);
175 base = xmalloc(len + 60);
176 sprintf(base, "%s/pack/pack-1234567890123456789012345678901234567890.pack", sha1_file_directory);
177 name = base + len + 11;
178 }
179
180 buf = name;
181
182 for (i = 0; i < 20; i++) {
183 unsigned int val = *sha1++;
184 *buf++ = hex[val >> 4];
185 *buf++ = hex[val & 0xf];
186 }
187
188 return base;
189 }
190
191 char *sha1_pack_index_name(const unsigned char *sha1)
192 {
193 static const char hex[] = "0123456789abcdef";
194 static char *name, *base, *buf;
195 int i;
196
197 if (!base) {
198 const char *sha1_file_directory = get_object_directory();
199 int len = strlen(sha1_file_directory);
200 base = xmalloc(len + 60);
201 sprintf(base, "%s/pack/pack-1234567890123456789012345678901234567890.idx", sha1_file_directory);
202 name = base + len + 11;
203 }
204
205 buf = name;
206
207 for (i = 0; i < 20; i++) {
208 unsigned int val = *sha1++;
209 *buf++ = hex[val >> 4];
210 *buf++ = hex[val & 0xf];
211 }
212
213 return base;
214 }
215
216 struct alternate_object_database *alt_odb_list;
217 static struct alternate_object_database **alt_odb_tail;
218
219 /*
220 * Prepare alternate object database registry.
221 *
222 * The variable alt_odb_list points at the list of struct
223 * alternate_object_database. The elements on this list come from
224 * non-empty elements from colon separated ALTERNATE_DB_ENVIRONMENT
225 * environment variable, and $GIT_OBJECT_DIRECTORY/info/alternates,
226 * whose contents is similar to that environment variable but can be
227 * LF separated. Its base points at a statically allocated buffer that
228 * contains "/the/directory/corresponding/to/.git/objects/...", while
229 * its name points just after the slash at the end of ".git/objects/"
230 * in the example above, and has enough space to hold 40-byte hex
231 * SHA1, an extra slash for the first level indirection, and the
232 * terminating NUL.
233 */
234 static void link_alt_odb_entries(const char *alt, const char *ep, int sep,
235 const char *relative_base)
236 {
237 const char *cp, *last;
238 struct alternate_object_database *ent;
239 const char *objdir = get_object_directory();
240 int base_len = -1;
241
242 last = alt;
243 while (last < ep) {
244 cp = last;
245 if (cp < ep && *cp == '#') {
246 while (cp < ep && *cp != sep)
247 cp++;
248 last = cp + 1;
249 continue;
250 }
251 for ( ; cp < ep && *cp != sep; cp++)
252 ;
253 if (last != cp) {
254 struct stat st;
255 struct alternate_object_database *alt;
256 /* 43 = 40-byte + 2 '/' + terminating NUL */
257 int pfxlen = cp - last;
258 int entlen = pfxlen + 43;
259
260 if (*last != '/' && relative_base) {
261 /* Relative alt-odb */
262 if (base_len < 0)
263 base_len = strlen(relative_base) + 1;
264 entlen += base_len;
265 pfxlen += base_len;
266 }
267 ent = xmalloc(sizeof(*ent) + entlen);
268
269 if (*last != '/' && relative_base) {
270 memcpy(ent->base, relative_base, base_len - 1);
271 ent->base[base_len - 1] = '/';
272 memcpy(ent->base + base_len,
273 last, cp - last);
274 }
275 else
276 memcpy(ent->base, last, pfxlen);
277
278 ent->name = ent->base + pfxlen + 1;
279 ent->base[pfxlen + 3] = '/';
280 ent->base[pfxlen] = ent->base[entlen-1] = 0;
281
282 /* Detect cases where alternate disappeared */
283 if (stat(ent->base, &st) || !S_ISDIR(st.st_mode)) {
284 error("object directory %s does not exist; "
285 "check .git/objects/info/alternates.",
286 ent->base);
287 goto bad;
288 }
289 ent->base[pfxlen] = '/';
290
291 /* Prevent the common mistake of listing the same
292 * thing twice, or object directory itself.
293 */
294 for (alt = alt_odb_list; alt; alt = alt->next)
295 if (!memcmp(ent->base, alt->base, pfxlen))
296 goto bad;
297 if (!memcmp(ent->base, objdir, pfxlen)) {
298 bad:
299 free(ent);
300 }
301 else {
302 *alt_odb_tail = ent;
303 alt_odb_tail = &(ent->next);
304 ent->next = NULL;
305 }
306 }
307 while (cp < ep && *cp == sep)
308 cp++;
309 last = cp;
310 }
311 }
312
313 void prepare_alt_odb(void)
314 {
315 char path[PATH_MAX];
316 char *map;
317 int fd;
318 struct stat st;
319 char *alt;
320
321 alt = getenv(ALTERNATE_DB_ENVIRONMENT);
322 if (!alt) alt = "";
323
324 if (alt_odb_tail)
325 return;
326 alt_odb_tail = &alt_odb_list;
327 link_alt_odb_entries(alt, alt + strlen(alt), ':', NULL);
328
329 sprintf(path, "%s/info/alternates", get_object_directory());
330 fd = open(path, O_RDONLY);
331 if (fd < 0)
332 return;
333 if (fstat(fd, &st) || (st.st_size == 0)) {
334 close(fd);
335 return;
336 }
337 map = mmap(NULL, st.st_size, PROT_READ, MAP_PRIVATE, fd, 0);
338 close(fd);
339 if (map == MAP_FAILED)
340 return;
341
342 link_alt_odb_entries(map, map + st.st_size, '\n',
343 get_object_directory());
344 munmap(map, st.st_size);
345 }
346
347 static char *find_sha1_file(const unsigned char *sha1, struct stat *st)
348 {
349 char *name = sha1_file_name(sha1);
350 struct alternate_object_database *alt;
351
352 if (!stat(name, st))
353 return name;
354 prepare_alt_odb();
355 for (alt = alt_odb_list; alt; alt = alt->next) {
356 name = alt->name;
357 fill_sha1_path(name, sha1);
358 if (!stat(alt->base, st))
359 return alt->base;
360 }
361 return NULL;
362 }
363
364 #define PACK_MAX_SZ (1<<26)
365 static int pack_used_ctr;
366 static unsigned long pack_mapped;
367 struct packed_git *packed_git;
368
369 static int check_packed_git_idx(const char *path, unsigned long *idx_size_,
370 void **idx_map_)
371 {
372 void *idx_map;
373 unsigned int *index;
374 unsigned long idx_size;
375 int nr, i;
376 int fd = open(path, O_RDONLY);
377 struct stat st;
378 if (fd < 0)
379 return -1;
380 if (fstat(fd, &st)) {
381 close(fd);
382 return -1;
383 }
384 idx_size = st.st_size;
385 idx_map = mmap(NULL, idx_size, PROT_READ, MAP_PRIVATE, fd, 0);
386 close(fd);
387 if (idx_map == MAP_FAILED)
388 return -1;
389
390 index = idx_map;
391 *idx_map_ = idx_map;
392 *idx_size_ = idx_size;
393
394 /* check index map */
395 if (idx_size < 4*256 + 20 + 20)
396 return error("index file too small");
397 nr = 0;
398 for (i = 0; i < 256; i++) {
399 unsigned int n = ntohl(index[i]);
400 if (n < nr)
401 return error("non-monotonic index");
402 nr = n;
403 }
404
405 /*
406 * Total size:
407 * - 256 index entries 4 bytes each
408 * - 24-byte entries * nr (20-byte sha1 + 4-byte offset)
409 * - 20-byte SHA1 of the packfile
410 * - 20-byte SHA1 file checksum
411 */
412 if (idx_size != 4*256 + nr * 24 + 20 + 20)
413 return error("wrong index file size");
414
415 return 0;
416 }
417
418 static int unuse_one_packed_git(void)
419 {
420 struct packed_git *p, *lru = NULL;
421
422 for (p = packed_git; p; p = p->next) {
423 if (p->pack_use_cnt || !p->pack_base)
424 continue;
425 if (!lru || p->pack_last_used < lru->pack_last_used)
426 lru = p;
427 }
428 if (!lru)
429 return 0;
430 munmap(lru->pack_base, lru->pack_size);
431 lru->pack_base = NULL;
432 return 1;
433 }
434
435 void unuse_packed_git(struct packed_git *p)
436 {
437 p->pack_use_cnt--;
438 }
439
440 int use_packed_git(struct packed_git *p)
441 {
442 if (!p->pack_size) {
443 struct stat st;
444 // We created the struct before we had the pack
445 stat(p->pack_name, &st);
446 if (!S_ISREG(st.st_mode))
447 die("packfile %s not a regular file", p->pack_name);
448 p->pack_size = st.st_size;
449 }
450 if (!p->pack_base) {
451 int fd;
452 struct stat st;
453 void *map;
454
455 pack_mapped += p->pack_size;
456 while (PACK_MAX_SZ < pack_mapped && unuse_one_packed_git())
457 ; /* nothing */
458 fd = open(p->pack_name, O_RDONLY);
459 if (fd < 0)
460 die("packfile %s cannot be opened", p->pack_name);
461 if (fstat(fd, &st)) {
462 close(fd);
463 die("packfile %s cannot be opened", p->pack_name);
464 }
465 if (st.st_size != p->pack_size)
466 die("packfile %s size mismatch.", p->pack_name);
467 map = mmap(NULL, p->pack_size, PROT_READ, MAP_PRIVATE, fd, 0);
468 close(fd);
469 if (map == MAP_FAILED)
470 die("packfile %s cannot be mapped.", p->pack_name);
471 p->pack_base = map;
472
473 /* Check if the pack file matches with the index file.
474 * this is cheap.
475 */
476 if (memcmp((char*)(p->index_base) + p->index_size - 40,
477 p->pack_base + p->pack_size - 20, 20)) {
478
479 die("packfile %s does not match index.", p->pack_name);
480 }
481 }
482 p->pack_last_used = pack_used_ctr++;
483 p->pack_use_cnt++;
484 return 0;
485 }
486
487 struct packed_git *add_packed_git(char *path, int path_len, int local)
488 {
489 struct stat st;
490 struct packed_git *p;
491 unsigned long idx_size;
492 void *idx_map;
493 unsigned char sha1[20];
494
495 if (check_packed_git_idx(path, &idx_size, &idx_map))
496 return NULL;
497
498 /* do we have a corresponding .pack file? */
499 strcpy(path + path_len - 4, ".pack");
500 if (stat(path, &st) || !S_ISREG(st.st_mode)) {
501 munmap(idx_map, idx_size);
502 return NULL;
503 }
504 /* ok, it looks sane as far as we can check without
505 * actually mapping the pack file.
506 */
507 p = xmalloc(sizeof(*p) + path_len + 2);
508 strcpy(p->pack_name, path);
509 p->index_size = idx_size;
510 p->pack_size = st.st_size;
511 p->index_base = idx_map;
512 p->next = NULL;
513 p->pack_base = NULL;
514 p->pack_last_used = 0;
515 p->pack_use_cnt = 0;
516 p->pack_local = local;
517 if ((path_len > 44) && !get_sha1_hex(path + path_len - 44, sha1))
518 memcpy(p->sha1, sha1, 20);
519 return p;
520 }
521
522 struct packed_git *parse_pack_index(unsigned char *sha1)
523 {
524 char *path = sha1_pack_index_name(sha1);
525 return parse_pack_index_file(sha1, path);
526 }
527
528 struct packed_git *parse_pack_index_file(const unsigned char *sha1, char *idx_path)
529 {
530 struct packed_git *p;
531 unsigned long idx_size;
532 void *idx_map;
533 char *path;
534
535 if (check_packed_git_idx(idx_path, &idx_size, &idx_map))
536 return NULL;
537
538 path = sha1_pack_name(sha1);
539
540 p = xmalloc(sizeof(*p) + strlen(path) + 2);
541 strcpy(p->pack_name, path);
542 p->index_size = idx_size;
543 p->pack_size = 0;
544 p->index_base = idx_map;
545 p->next = NULL;
546 p->pack_base = NULL;
547 p->pack_last_used = 0;
548 p->pack_use_cnt = 0;
549 memcpy(p->sha1, sha1, 20);
550 return p;
551 }
552
553 void install_packed_git(struct packed_git *pack)
554 {
555 pack->next = packed_git;
556 packed_git = pack;
557 }
558
559 static void prepare_packed_git_one(char *objdir, int local)
560 {
561 char path[PATH_MAX];
562 int len;
563 DIR *dir;
564 struct dirent *de;
565
566 sprintf(path, "%s/pack", objdir);
567 len = strlen(path);
568 dir = opendir(path);
569 if (!dir) {
570 if (errno != ENOENT)
571 error("unable to open object pack directory: %s: %s",
572 path, strerror(errno));
573 return;
574 }
575 path[len++] = '/';
576 while ((de = readdir(dir)) != NULL) {
577 int namelen = strlen(de->d_name);
578 struct packed_git *p;
579
580 if (strcmp(de->d_name + namelen - 4, ".idx"))
581 continue;
582
583 /* we have .idx. Is it a file we can map? */
584 strcpy(path + len, de->d_name);
585 p = add_packed_git(path, len + namelen, local);
586 if (!p)
587 continue;
588 p->next = packed_git;
589 packed_git = p;
590 }
591 closedir(dir);
592 }
593
594 void prepare_packed_git(void)
595 {
596 static int run_once = 0;
597 struct alternate_object_database *alt;
598
599 if (run_once)
600 return;
601 prepare_packed_git_one(get_object_directory(), 1);
602 prepare_alt_odb();
603 for (alt = alt_odb_list; alt; alt = alt->next) {
604 alt->name[-1] = 0;
605 prepare_packed_git_one(alt->base, 0);
606 alt->name[-1] = '/';
607 }
608 run_once = 1;
609 }
610
611 int check_sha1_signature(const unsigned char *sha1, void *map, unsigned long size, const char *type)
612 {
613 char header[100];
614 unsigned char real_sha1[20];
615 SHA_CTX c;
616
617 SHA1_Init(&c);
618 SHA1_Update(&c, header, 1+sprintf(header, "%s %lu", type, size));
619 SHA1_Update(&c, map, size);
620 SHA1_Final(real_sha1, &c);
621 return memcmp(sha1, real_sha1, 20) ? -1 : 0;
622 }
623
624 static void *map_sha1_file_internal(const unsigned char *sha1,
625 unsigned long *size)
626 {
627 struct stat st;
628 void *map;
629 int fd;
630 char *filename = find_sha1_file(sha1, &st);
631
632 if (!filename) {
633 return NULL;
634 }
635
636 fd = open(filename, O_RDONLY | sha1_file_open_flag);
637 if (fd < 0) {
638 /* See if it works without O_NOATIME */
639 switch (sha1_file_open_flag) {
640 default:
641 fd = open(filename, O_RDONLY);
642 if (fd >= 0)
643 break;
644 /* Fallthrough */
645 case 0:
646 return NULL;
647 }
648
649 /* If it failed once, it will probably fail again.
650 * Stop using O_NOATIME
651 */
652 sha1_file_open_flag = 0;
653 }
654 map = mmap(NULL, st.st_size, PROT_READ, MAP_PRIVATE, fd, 0);
655 close(fd);
656 if (map == MAP_FAILED)
657 return NULL;
658 *size = st.st_size;
659 return map;
660 }
661
662 int unpack_sha1_header(z_stream *stream, void *map, unsigned long mapsize, void *buffer, unsigned long size)
663 {
664 /* Get the data stream */
665 memset(stream, 0, sizeof(*stream));
666 stream->next_in = map;
667 stream->avail_in = mapsize;
668 stream->next_out = buffer;
669 stream->avail_out = size;
670
671 inflateInit(stream);
672 return inflate(stream, 0);
673 }
674
675 static void *unpack_sha1_rest(z_stream *stream, void *buffer, unsigned long size)
676 {
677 int bytes = strlen(buffer) + 1;
678 unsigned char *buf = xmalloc(1+size);
679
680 memcpy(buf, buffer + bytes, stream->total_out - bytes);
681 bytes = stream->total_out - bytes;
682 if (bytes < size) {
683 stream->next_out = buf + bytes;
684 stream->avail_out = size - bytes;
685 while (inflate(stream, Z_FINISH) == Z_OK)
686 /* nothing */;
687 }
688 buf[size] = 0;
689 inflateEnd(stream);
690 return buf;
691 }
692
693 /*
694 * We used to just use "sscanf()", but that's actually way
695 * too permissive for what we want to check. So do an anal
696 * object header parse by hand.
697 */
698 int parse_sha1_header(char *hdr, char *type, unsigned long *sizep)
699 {
700 int i;
701 unsigned long size;
702
703 /*
704 * The type can be at most ten bytes (including the
705 * terminating '\0' that we add), and is followed by
706 * a space.
707 */
708 i = 10;
709 for (;;) {
710 char c = *hdr++;
711 if (c == ' ')
712 break;
713 if (!--i)
714 return -1;
715 *type++ = c;
716 }
717 *type = 0;
718
719 /*
720 * The length must follow immediately, and be in canonical
721 * decimal format (ie "010" is not valid).
722 */
723 size = *hdr++ - '0';
724 if (size > 9)
725 return -1;
726 if (size) {
727 for (;;) {
728 unsigned long c = *hdr - '0';
729 if (c > 9)
730 break;
731 hdr++;
732 size = size * 10 + c;
733 }
734 }
735 *sizep = size;
736
737 /*
738 * The length must be followed by a zero byte
739 */
740 return *hdr ? -1 : 0;
741 }
742
743 void * unpack_sha1_file(void *map, unsigned long mapsize, char *type, unsigned long *size)
744 {
745 int ret;
746 z_stream stream;
747 char hdr[8192];
748
749 ret = unpack_sha1_header(&stream, map, mapsize, hdr, sizeof(hdr));
750 if (ret < Z_OK || parse_sha1_header(hdr, type, size) < 0)
751 return NULL;
752
753 return unpack_sha1_rest(&stream, hdr, *size);
754 }
755
756 /* forward declaration for a mutually recursive function */
757 static int packed_object_info(struct pack_entry *entry,
758 char *type, unsigned long *sizep);
759
760 static int packed_delta_info(unsigned char *base_sha1,
761 unsigned long delta_size,
762 unsigned long left,
763 char *type,
764 unsigned long *sizep,
765 struct packed_git *p)
766 {
767 struct pack_entry base_ent;
768
769 if (left < 20)
770 die("truncated pack file");
771
772 /* The base entry _must_ be in the same pack */
773 if (!find_pack_entry_one(base_sha1, &base_ent, p))
774 die("failed to find delta-pack base object %s",
775 sha1_to_hex(base_sha1));
776
777 /* We choose to only get the type of the base object and
778 * ignore potentially corrupt pack file that expects the delta
779 * based on a base with a wrong size. This saves tons of
780 * inflate() calls.
781 */
782
783 if (packed_object_info(&base_ent, type, NULL))
784 die("cannot get info for delta-pack base");
785
786 if (sizep) {
787 const unsigned char *data;
788 unsigned char delta_head[64];
789 unsigned long result_size;
790 z_stream stream;
791 int st;
792
793 memset(&stream, 0, sizeof(stream));
794
795 data = stream.next_in = base_sha1 + 20;
796 stream.avail_in = left - 20;
797 stream.next_out = delta_head;
798 stream.avail_out = sizeof(delta_head);
799
800 inflateInit(&stream);
801 st = inflate(&stream, Z_FINISH);
802 inflateEnd(&stream);
803 if ((st != Z_STREAM_END) &&
804 stream.total_out != sizeof(delta_head))
805 die("delta data unpack-initial failed");
806
807 /* Examine the initial part of the delta to figure out
808 * the result size.
809 */
810 data = delta_head;
811
812 /* ignore base size */
813 get_delta_hdr_size(&data, delta_head+sizeof(delta_head));
814
815 /* Read the result size */
816 result_size = get_delta_hdr_size(&data, delta_head+sizeof(delta_head));
817 *sizep = result_size;
818 }
819 return 0;
820 }
821
822 static unsigned long unpack_object_header(struct packed_git *p, unsigned long offset,
823 enum object_type *type, unsigned long *sizep)
824 {
825 unsigned shift;
826 unsigned char *pack, c;
827 unsigned long size;
828
829 if (offset >= p->pack_size)
830 die("object offset outside of pack file");
831
832 pack = p->pack_base + offset;
833 c = *pack++;
834 offset++;
835 *type = (c >> 4) & 7;
836 size = c & 15;
837 shift = 4;
838 while (c & 0x80) {
839 if (offset >= p->pack_size)
840 die("object offset outside of pack file");
841 c = *pack++;
842 offset++;
843 size += (c & 0x7f) << shift;
844 shift += 7;
845 }
846 *sizep = size;
847 return offset;
848 }
849
850 int check_reuse_pack_delta(struct packed_git *p, unsigned long offset,
851 unsigned char *base, unsigned long *sizep,
852 enum object_type *kindp)
853 {
854 unsigned long ptr;
855 int status = -1;
856
857 use_packed_git(p);
858 ptr = offset;
859 ptr = unpack_object_header(p, ptr, kindp, sizep);
860 if (*kindp != OBJ_DELTA)
861 goto done;
862 memcpy(base, p->pack_base + ptr, 20);
863 status = 0;
864 done:
865 unuse_packed_git(p);
866 return status;
867 }
868
869 void packed_object_info_detail(struct pack_entry *e,
870 char *type,
871 unsigned long *size,
872 unsigned long *store_size,
873 unsigned int *delta_chain_length,
874 unsigned char *base_sha1)
875 {
876 struct packed_git *p = e->p;
877 unsigned long offset, left;
878 unsigned char *pack;
879 enum object_type kind;
880
881 offset = unpack_object_header(p, e->offset, &kind, size);
882 pack = p->pack_base + offset;
883 left = p->pack_size - offset;
884 if (kind != OBJ_DELTA)
885 *delta_chain_length = 0;
886 else {
887 unsigned int chain_length = 0;
888 memcpy(base_sha1, pack, 20);
889 do {
890 struct pack_entry base_ent;
891 unsigned long junk;
892
893 find_pack_entry_one(pack, &base_ent, p);
894 offset = unpack_object_header(p, base_ent.offset,
895 &kind, &junk);
896 pack = p->pack_base + offset;
897 chain_length++;
898 } while (kind == OBJ_DELTA);
899 *delta_chain_length = chain_length;
900 }
901 switch (kind) {
902 case OBJ_COMMIT:
903 strcpy(type, commit_type);
904 break;
905 case OBJ_TREE:
906 strcpy(type, tree_type);
907 break;
908 case OBJ_BLOB:
909 strcpy(type, blob_type);
910 break;
911 case OBJ_TAG:
912 strcpy(type, tag_type);
913 break;
914 default:
915 die("corrupted pack file %s containing object of kind %d",
916 p->pack_name, kind);
917 }
918 *store_size = 0; /* notyet */
919 }
920
921 static int packed_object_info(struct pack_entry *entry,
922 char *type, unsigned long *sizep)
923 {
924 struct packed_git *p = entry->p;
925 unsigned long offset, size, left;
926 unsigned char *pack;
927 enum object_type kind;
928 int retval;
929
930 if (use_packed_git(p))
931 die("cannot map packed file");
932
933 offset = unpack_object_header(p, entry->offset, &kind, &size);
934 pack = p->pack_base + offset;
935 left = p->pack_size - offset;
936
937 switch (kind) {
938 case OBJ_DELTA:
939 retval = packed_delta_info(pack, size, left, type, sizep, p);
940 unuse_packed_git(p);
941 return retval;
942 case OBJ_COMMIT:
943 strcpy(type, commit_type);
944 break;
945 case OBJ_TREE:
946 strcpy(type, tree_type);
947 break;
948 case OBJ_BLOB:
949 strcpy(type, blob_type);
950 break;
951 case OBJ_TAG:
952 strcpy(type, tag_type);
953 break;
954 default:
955 die("corrupted pack file %s containing object of kind %d",
956 p->pack_name, kind);
957 }
958 if (sizep)
959 *sizep = size;
960 unuse_packed_git(p);
961 return 0;
962 }
963
964 /* forward declaration for a mutually recursive function */
965 static void *unpack_entry(struct pack_entry *, char *, unsigned long *);
966
967 static void *unpack_delta_entry(unsigned char *base_sha1,
968 unsigned long delta_size,
969 unsigned long left,
970 char *type,
971 unsigned long *sizep,
972 struct packed_git *p)
973 {
974 struct pack_entry base_ent;
975 void *data, *delta_data, *result, *base;
976 unsigned long data_size, result_size, base_size;
977 z_stream stream;
978 int st;
979
980 if (left < 20)
981 die("truncated pack file");
982
983 /* The base entry _must_ be in the same pack */
984 if (!find_pack_entry_one(base_sha1, &base_ent, p))
985 die("failed to find delta-pack base object %s",
986 sha1_to_hex(base_sha1));
987 base = unpack_entry_gently(&base_ent, type, &base_size);
988 if (!base)
989 die("failed to read delta-pack base object %s",
990 sha1_to_hex(base_sha1));
991
992 data = base_sha1 + 20;
993 data_size = left - 20;
994 delta_data = xmalloc(delta_size);
995
996 memset(&stream, 0, sizeof(stream));
997
998 stream.next_in = data;
999 stream.avail_in = data_size;
1000 stream.next_out = delta_data;
1001 stream.avail_out = delta_size;
1002
1003 inflateInit(&stream);
1004 st = inflate(&stream, Z_FINISH);
1005 inflateEnd(&stream);
1006 if ((st != Z_STREAM_END) || stream.total_out != delta_size)
1007 die("delta data unpack failed");
1008
1009 result = patch_delta(base, base_size,
1010 delta_data, delta_size,
1011 &result_size);
1012 if (!result)
1013 die("failed to apply delta");
1014 free(delta_data);
1015 free(base);
1016 *sizep = result_size;
1017 return result;
1018 }
1019
1020 static void *unpack_non_delta_entry(unsigned char *data,
1021 unsigned long size,
1022 unsigned long left)
1023 {
1024 int st;
1025 z_stream stream;
1026 unsigned char *buffer;
1027
1028 buffer = xmalloc(size + 1);
1029 buffer[size] = 0;
1030 memset(&stream, 0, sizeof(stream));
1031 stream.next_in = data;
1032 stream.avail_in = left;
1033 stream.next_out = buffer;
1034 stream.avail_out = size;
1035
1036 inflateInit(&stream);
1037 st = inflate(&stream, Z_FINISH);
1038 inflateEnd(&stream);
1039 if ((st != Z_STREAM_END) || stream.total_out != size) {
1040 free(buffer);
1041 return NULL;
1042 }
1043
1044 return buffer;
1045 }
1046
1047 static void *unpack_entry(struct pack_entry *entry,
1048 char *type, unsigned long *sizep)
1049 {
1050 struct packed_git *p = entry->p;
1051 void *retval;
1052
1053 if (use_packed_git(p))
1054 die("cannot map packed file");
1055 retval = unpack_entry_gently(entry, type, sizep);
1056 unuse_packed_git(p);
1057 if (!retval)
1058 die("corrupted pack file %s", p->pack_name);
1059 return retval;
1060 }
1061
1062 /* The caller is responsible for use_packed_git()/unuse_packed_git() pair */
1063 void *unpack_entry_gently(struct pack_entry *entry,
1064 char *type, unsigned long *sizep)
1065 {
1066 struct packed_git *p = entry->p;
1067 unsigned long offset, size, left;
1068 unsigned char *pack;
1069 enum object_type kind;
1070 void *retval;
1071
1072 offset = unpack_object_header(p, entry->offset, &kind, &size);
1073 pack = p->pack_base + offset;
1074 left = p->pack_size - offset;
1075 switch (kind) {
1076 case OBJ_DELTA:
1077 retval = unpack_delta_entry(pack, size, left, type, sizep, p);
1078 return retval;
1079 case OBJ_COMMIT:
1080 strcpy(type, commit_type);
1081 break;
1082 case OBJ_TREE:
1083 strcpy(type, tree_type);
1084 break;
1085 case OBJ_BLOB:
1086 strcpy(type, blob_type);
1087 break;
1088 case OBJ_TAG:
1089 strcpy(type, tag_type);
1090 break;
1091 default:
1092 return NULL;
1093 }
1094 *sizep = size;
1095 retval = unpack_non_delta_entry(pack, size, left);
1096 return retval;
1097 }
1098
1099 int num_packed_objects(const struct packed_git *p)
1100 {
1101 /* See check_packed_git_idx() */
1102 return (p->index_size - 20 - 20 - 4*256) / 24;
1103 }
1104
1105 int nth_packed_object_sha1(const struct packed_git *p, int n,
1106 unsigned char* sha1)
1107 {
1108 void *index = p->index_base + 256;
1109 if (n < 0 || num_packed_objects(p) <= n)
1110 return -1;
1111 memcpy(sha1, (index + 24 * n + 4), 20);
1112 return 0;
1113 }
1114
1115 int find_pack_entry_one(const unsigned char *sha1,
1116 struct pack_entry *e, struct packed_git *p)
1117 {
1118 unsigned int *level1_ofs = p->index_base;
1119 int hi = ntohl(level1_ofs[*sha1]);
1120 int lo = ((*sha1 == 0x0) ? 0 : ntohl(level1_ofs[*sha1 - 1]));
1121 void *index = p->index_base + 256;
1122
1123 do {
1124 int mi = (lo + hi) / 2;
1125 int cmp = memcmp(index + 24 * mi + 4, sha1, 20);
1126 if (!cmp) {
1127 e->offset = ntohl(*((int*)(index + 24 * mi)));
1128 memcpy(e->sha1, sha1, 20);
1129 e->p = p;
1130 return 1;
1131 }
1132 if (cmp > 0)
1133 hi = mi;
1134 else
1135 lo = mi+1;
1136 } while (lo < hi);
1137 return 0;
1138 }
1139
1140 static int find_pack_entry(const unsigned char *sha1, struct pack_entry *e)
1141 {
1142 struct packed_git *p;
1143 prepare_packed_git();
1144
1145 for (p = packed_git; p; p = p->next) {
1146 if (find_pack_entry_one(sha1, e, p))
1147 return 1;
1148 }
1149 return 0;
1150 }
1151
1152 struct packed_git *find_sha1_pack(const unsigned char *sha1,
1153 struct packed_git *packs)
1154 {
1155 struct packed_git *p;
1156 struct pack_entry e;
1157
1158 for (p = packs; p; p = p->next) {
1159 if (find_pack_entry_one(sha1, &e, p))
1160 return p;
1161 }
1162 return NULL;
1163
1164 }
1165
1166 int sha1_object_info(const unsigned char *sha1, char *type, unsigned long *sizep)
1167 {
1168 int status;
1169 unsigned long mapsize, size;
1170 void *map;
1171 z_stream stream;
1172 char hdr[128];
1173
1174 map = map_sha1_file_internal(sha1, &mapsize);
1175 if (!map) {
1176 struct pack_entry e;
1177
1178 if (!find_pack_entry(sha1, &e))
1179 return error("unable to find %s", sha1_to_hex(sha1));
1180 return packed_object_info(&e, type, sizep);
1181 }
1182 if (unpack_sha1_header(&stream, map, mapsize, hdr, sizeof(hdr)) < 0)
1183 status = error("unable to unpack %s header",
1184 sha1_to_hex(sha1));
1185 if (parse_sha1_header(hdr, type, &size) < 0)
1186 status = error("unable to parse %s header", sha1_to_hex(sha1));
1187 else {
1188 status = 0;
1189 if (sizep)
1190 *sizep = size;
1191 }
1192 inflateEnd(&stream);
1193 munmap(map, mapsize);
1194 return status;
1195 }
1196
1197 static void *read_packed_sha1(const unsigned char *sha1, char *type, unsigned long *size)
1198 {
1199 struct pack_entry e;
1200
1201 if (!find_pack_entry(sha1, &e)) {
1202 error("cannot read sha1_file for %s", sha1_to_hex(sha1));
1203 return NULL;
1204 }
1205 return unpack_entry(&e, type, size);
1206 }
1207
1208 void * read_sha1_file(const unsigned char *sha1, char *type, unsigned long *size)
1209 {
1210 unsigned long mapsize;
1211 void *map, *buf;
1212 struct pack_entry e;
1213
1214 if (find_pack_entry(sha1, &e))
1215 return read_packed_sha1(sha1, type, size);
1216 map = map_sha1_file_internal(sha1, &mapsize);
1217 if (map) {
1218 buf = unpack_sha1_file(map, mapsize, type, size);
1219 munmap(map, mapsize);
1220 return buf;
1221 }
1222 return NULL;
1223 }
1224
1225 void *read_object_with_reference(const unsigned char *sha1,
1226 const char *required_type,
1227 unsigned long *size,
1228 unsigned char *actual_sha1_return)
1229 {
1230 char type[20];
1231 void *buffer;
1232 unsigned long isize;
1233 unsigned char actual_sha1[20];
1234
1235 memcpy(actual_sha1, sha1, 20);
1236 while (1) {
1237 int ref_length = -1;
1238 const char *ref_type = NULL;
1239
1240 buffer = read_sha1_file(actual_sha1, type, &isize);
1241 if (!buffer)
1242 return NULL;
1243 if (!strcmp(type, required_type)) {
1244 *size = isize;
1245 if (actual_sha1_return)
1246 memcpy(actual_sha1_return, actual_sha1, 20);
1247 return buffer;
1248 }
1249 /* Handle references */
1250 else if (!strcmp(type, commit_type))
1251 ref_type = "tree ";
1252 else if (!strcmp(type, tag_type))
1253 ref_type = "object ";
1254 else {
1255 free(buffer);
1256 return NULL;
1257 }
1258 ref_length = strlen(ref_type);
1259
1260 if (memcmp(buffer, ref_type, ref_length) ||
1261 get_sha1_hex(buffer + ref_length, actual_sha1)) {
1262 free(buffer);
1263 return NULL;
1264 }
1265 free(buffer);
1266 /* Now we have the ID of the referred-to object in
1267 * actual_sha1. Check again. */
1268 }
1269 }
1270
1271 char *write_sha1_file_prepare(void *buf,
1272 unsigned long len,
1273 const char *type,
1274 unsigned char *sha1,
1275 unsigned char *hdr,
1276 int *hdrlen)
1277 {
1278 SHA_CTX c;
1279
1280 /* Generate the header */
1281 *hdrlen = sprintf((char *)hdr, "%s %lu", type, len)+1;
1282
1283 /* Sha1.. */
1284 SHA1_Init(&c);
1285 SHA1_Update(&c, hdr, *hdrlen);
1286 SHA1_Update(&c, buf, len);
1287 SHA1_Final(sha1, &c);
1288
1289 return sha1_file_name(sha1);
1290 }
1291
1292 /*
1293 * Link the tempfile to the final place, possibly creating the
1294 * last directory level as you do so.
1295 *
1296 * Returns the errno on failure, 0 on success.
1297 */
1298 static int link_temp_to_file(const char *tmpfile, char *filename)
1299 {
1300 int ret;
1301
1302 if (!link(tmpfile, filename))
1303 return 0;
1304
1305 /*
1306 * Try to mkdir the last path component if that failed
1307 * with an ENOENT.
1308 *
1309 * Re-try the "link()" regardless of whether the mkdir
1310 * succeeds, since a race might mean that somebody
1311 * else succeeded.
1312 */
1313 ret = errno;
1314 if (ret == ENOENT) {
1315 char *dir = strrchr(filename, '/');
1316 if (dir) {
1317 *dir = 0;
1318 mkdir(filename, 0777);
1319 if (adjust_shared_perm(filename))
1320 return -2;
1321 *dir = '/';
1322 if (!link(tmpfile, filename))
1323 return 0;
1324 ret = errno;
1325 }
1326 }
1327 return ret;
1328 }
1329
1330 /*
1331 * Move the just written object into its final resting place
1332 */
1333 int move_temp_to_file(const char *tmpfile, char *filename)
1334 {
1335 int ret = link_temp_to_file(tmpfile, filename);
1336
1337 /*
1338 * Coda hack - coda doesn't like cross-directory links,
1339 * so we fall back to a rename, which will mean that it
1340 * won't be able to check collisions, but that's not a
1341 * big deal.
1342 *
1343 * The same holds for FAT formatted media.
1344 *
1345 * When this succeeds, we just return 0. We have nothing
1346 * left to unlink.
1347 */
1348 if (ret && ret != EEXIST) {
1349 if (!rename(tmpfile, filename))
1350 return 0;
1351 ret = errno;
1352 }
1353 unlink(tmpfile);
1354 if (ret) {
1355 if (ret != EEXIST) {
1356 fprintf(stderr, "unable to write sha1 filename %s: %s\n", filename, strerror(ret));
1357 return -1;
1358 }
1359 /* FIXME!!! Collision check here ? */
1360 }
1361
1362 return 0;
1363 }
1364
1365 int write_sha1_file(void *buf, unsigned long len, const char *type, unsigned char *returnsha1)
1366 {
1367 int size;
1368 unsigned char *compressed;
1369 z_stream stream;
1370 unsigned char sha1[20];
1371 char *filename;
1372 static char tmpfile[PATH_MAX];
1373 unsigned char hdr[50];
1374 int fd, hdrlen;
1375
1376 /* Normally if we have it in the pack then we do not bother writing
1377 * it out into .git/objects/??/?{38} file.
1378 */
1379 filename = write_sha1_file_prepare(buf, len, type, sha1, hdr, &hdrlen);
1380 if (returnsha1)
1381 memcpy(returnsha1, sha1, 20);
1382 if (has_sha1_file(sha1))
1383 return 0;
1384 fd = open(filename, O_RDONLY);
1385 if (fd >= 0) {
1386 /*
1387 * FIXME!!! We might do collision checking here, but we'd
1388 * need to uncompress the old file and check it. Later.
1389 */
1390 close(fd);
1391 return 0;
1392 }
1393
1394 if (errno != ENOENT) {
1395 fprintf(stderr, "sha1 file %s: %s\n", filename, strerror(errno));
1396 return -1;
1397 }
1398
1399 snprintf(tmpfile, sizeof(tmpfile), "%s/obj_XXXXXX", get_object_directory());
1400
1401 fd = mkstemp(tmpfile);
1402 if (fd < 0) {
1403 fprintf(stderr, "unable to create temporary sha1 filename %s: %s\n", tmpfile, strerror(errno));
1404 return -1;
1405 }
1406
1407 /* Set it up */
1408 memset(&stream, 0, sizeof(stream));
1409 deflateInit(&stream, Z_BEST_COMPRESSION);
1410 size = deflateBound(&stream, len+hdrlen);
1411 compressed = xmalloc(size);
1412
1413 /* Compress it */
1414 stream.next_out = compressed;
1415 stream.avail_out = size;
1416
1417 /* First header.. */
1418 stream.next_in = hdr;
1419 stream.avail_in = hdrlen;
1420 while (deflate(&stream, 0) == Z_OK)
1421 /* nothing */;
1422
1423 /* Then the data itself.. */
1424 stream.next_in = buf;
1425 stream.avail_in = len;
1426 while (deflate(&stream, Z_FINISH) == Z_OK)
1427 /* nothing */;
1428 deflateEnd(&stream);
1429 size = stream.total_out;
1430
1431 if (write(fd, compressed, size) != size)
1432 die("unable to write file");
1433 fchmod(fd, 0444);
1434 close(fd);
1435 free(compressed);
1436
1437 return move_temp_to_file(tmpfile, filename);
1438 }
1439
1440 int write_sha1_to_fd(int fd, const unsigned char *sha1)
1441 {
1442 ssize_t size;
1443 unsigned long objsize;
1444 int posn = 0;
1445 void *map = map_sha1_file_internal(sha1, &objsize);
1446 void *buf = map;
1447 void *temp_obj = NULL;
1448 z_stream stream;
1449
1450 if (!buf) {
1451 unsigned char *unpacked;
1452 unsigned long len;
1453 char type[20];
1454 char hdr[50];
1455 int hdrlen;
1456 // need to unpack and recompress it by itself
1457 unpacked = read_packed_sha1(sha1, type, &len);
1458
1459 hdrlen = sprintf(hdr, "%s %lu", type, len) + 1;
1460
1461 /* Set it up */
1462 memset(&stream, 0, sizeof(stream));
1463 deflateInit(&stream, Z_BEST_COMPRESSION);
1464 size = deflateBound(&stream, len + hdrlen);
1465 temp_obj = buf = xmalloc(size);
1466
1467 /* Compress it */
1468 stream.next_out = buf;
1469 stream.avail_out = size;
1470
1471 /* First header.. */
1472 stream.next_in = (void *)hdr;
1473 stream.avail_in = hdrlen;
1474 while (deflate(&stream, 0) == Z_OK)
1475 /* nothing */;
1476
1477 /* Then the data itself.. */
1478 stream.next_in = unpacked;
1479 stream.avail_in = len;
1480 while (deflate(&stream, Z_FINISH) == Z_OK)
1481 /* nothing */;
1482 deflateEnd(&stream);
1483 free(unpacked);
1484
1485 objsize = stream.total_out;
1486 }
1487
1488 do {
1489 size = write(fd, buf + posn, objsize - posn);
1490 if (size <= 0) {
1491 if (!size) {
1492 fprintf(stderr, "write closed\n");
1493 } else {
1494 perror("write ");
1495 }
1496 return -1;
1497 }
1498 posn += size;
1499 } while (posn < objsize);
1500
1501 if (map)
1502 munmap(map, objsize);
1503 if (temp_obj)
1504 free(temp_obj);
1505
1506 return 0;
1507 }
1508
1509 int write_sha1_from_fd(const unsigned char *sha1, int fd, char *buffer,
1510 size_t bufsize, size_t *bufposn)
1511 {
1512 char tmpfile[PATH_MAX];
1513 int local;
1514 z_stream stream;
1515 unsigned char real_sha1[20];
1516 unsigned char discard[4096];
1517 int ret;
1518 SHA_CTX c;
1519
1520 snprintf(tmpfile, sizeof(tmpfile), "%s/obj_XXXXXX", get_object_directory());
1521
1522 local = mkstemp(tmpfile);
1523 if (local < 0)
1524 return error("Couldn't open %s for %s",
1525 tmpfile, sha1_to_hex(sha1));
1526
1527 memset(&stream, 0, sizeof(stream));
1528
1529 inflateInit(&stream);
1530
1531 SHA1_Init(&c);
1532
1533 do {
1534 ssize_t size;
1535 if (*bufposn) {
1536 stream.avail_in = *bufposn;
1537 stream.next_in = (unsigned char *) buffer;
1538 do {
1539 stream.next_out = discard;
1540 stream.avail_out = sizeof(discard);
1541 ret = inflate(&stream, Z_SYNC_FLUSH);
1542 SHA1_Update(&c, discard, sizeof(discard) -
1543 stream.avail_out);
1544 } while (stream.avail_in && ret == Z_OK);
1545 write(local, buffer, *bufposn - stream.avail_in);
1546 memmove(buffer, buffer + *bufposn - stream.avail_in,
1547 stream.avail_in);
1548 *bufposn = stream.avail_in;
1549 if (ret != Z_OK)
1550 break;
1551 }
1552 size = read(fd, buffer + *bufposn, bufsize - *bufposn);
1553 if (size <= 0) {
1554 close(local);
1555 unlink(tmpfile);
1556 if (!size)
1557 return error("Connection closed?");
1558 perror("Reading from connection");
1559 return -1;
1560 }
1561 *bufposn += size;
1562 } while (1);
1563 inflateEnd(&stream);
1564
1565 close(local);
1566 SHA1_Final(real_sha1, &c);
1567 if (ret != Z_STREAM_END) {
1568 unlink(tmpfile);
1569 return error("File %s corrupted", sha1_to_hex(sha1));
1570 }
1571 if (memcmp(sha1, real_sha1, 20)) {
1572 unlink(tmpfile);
1573 return error("File %s has bad hash", sha1_to_hex(sha1));
1574 }
1575
1576 return move_temp_to_file(tmpfile, sha1_file_name(sha1));
1577 }
1578
1579 int has_pack_index(const unsigned char *sha1)
1580 {
1581 struct stat st;
1582 if (stat(sha1_pack_index_name(sha1), &st))
1583 return 0;
1584 return 1;
1585 }
1586
1587 int has_pack_file(const unsigned char *sha1)
1588 {
1589 struct stat st;
1590 if (stat(sha1_pack_name(sha1), &st))
1591 return 0;
1592 return 1;
1593 }
1594
1595 int has_sha1_pack(const unsigned char *sha1)
1596 {
1597 struct pack_entry e;
1598 return find_pack_entry(sha1, &e);
1599 }
1600
1601 int has_sha1_file(const unsigned char *sha1)
1602 {
1603 struct stat st;
1604 struct pack_entry e;
1605
1606 if (find_pack_entry(sha1, &e))
1607 return 1;
1608 return find_sha1_file(sha1, &st) ? 1 : 0;
1609 }
1610
1611 int index_pipe(unsigned char *sha1, int fd, const char *type, int write_object)
1612 {
1613 unsigned long size = 4096;
1614 char *buf = malloc(size);
1615 int iret, ret;
1616 unsigned long off = 0;
1617 unsigned char hdr[50];
1618 int hdrlen;
1619 do {
1620 iret = read(fd, buf + off, size - off);
1621 if (iret > 0) {
1622 off += iret;
1623 if (off == size) {
1624 size *= 2;
1625 buf = realloc(buf, size);
1626 }
1627 }
1628 } while (iret > 0);
1629 if (iret < 0) {
1630 free(buf);
1631 return -1;
1632 }
1633 if (!type)
1634 type = blob_type;
1635 if (write_object)
1636 ret = write_sha1_file(buf, off, type, sha1);
1637 else {
1638 write_sha1_file_prepare(buf, off, type, sha1, hdr, &hdrlen);
1639 ret = 0;
1640 }
1641 free(buf);
1642 return ret;
1643 }
1644
1645 int index_fd(unsigned char *sha1, int fd, struct stat *st, int write_object, const char *type)
1646 {
1647 unsigned long size = st->st_size;
1648 void *buf;
1649 int ret;
1650 unsigned char hdr[50];
1651 int hdrlen;
1652
1653 buf = "";
1654 if (size)
1655 buf = mmap(NULL, size, PROT_READ, MAP_PRIVATE, fd, 0);
1656 close(fd);
1657 if (buf == MAP_FAILED)
1658 return -1;
1659
1660 if (!type)
1661 type = blob_type;
1662 if (write_object)
1663 ret = write_sha1_file(buf, size, type, sha1);
1664 else {
1665 write_sha1_file_prepare(buf, size, type, sha1, hdr, &hdrlen);
1666 ret = 0;
1667 }
1668 if (size)
1669 munmap(buf, size);
1670 return ret;
1671 }
1672
1673 int index_path(unsigned char *sha1, const char *path, struct stat *st, int write_object)
1674 {
1675 int fd;
1676 char *target;
1677
1678 switch (st->st_mode & S_IFMT) {
1679 case S_IFREG:
1680 fd = open(path, O_RDONLY);
1681 if (fd < 0)
1682 return error("open(\"%s\"): %s", path,
1683 strerror(errno));
1684 if (index_fd(sha1, fd, st, write_object, NULL) < 0)
1685 return error("%s: failed to insert into database",
1686 path);
1687 break;
1688 case S_IFLNK:
1689 target = xmalloc(st->st_size+1);
1690 if (readlink(path, target, st->st_size+1) != st->st_size) {
1691 char *errstr = strerror(errno);
1692 free(target);
1693 return error("readlink(\"%s\"): %s", path,
1694 errstr);
1695 }
1696 if (!write_object) {
1697 unsigned char hdr[50];
1698 int hdrlen;
1699 write_sha1_file_prepare(target, st->st_size, blob_type,
1700 sha1, hdr, &hdrlen);
1701 } else if (write_sha1_file(target, st->st_size, blob_type, sha1))
1702 return error("%s: failed to insert into database",
1703 path);
1704 free(target);
1705 break;
1706 default:
1707 return error("%s: unsupported file type", path);
1708 }
1709 return 0;
1710 }