Merge branch 'fix'
[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 #include <stdint.h>
17
18 #ifndef O_NOATIME
19 #if defined(__linux__) && (defined(__i386__) || defined(__PPC__))
20 #define O_NOATIME 01000000
21 #else
22 #define O_NOATIME 0
23 #endif
24 #endif
25
26 const unsigned char null_sha1[20] = { 0, };
27
28 static unsigned int sha1_file_open_flag = O_NOATIME;
29
30 static unsigned hexval(char c)
31 {
32 if (c >= '0' && c <= '9')
33 return c - '0';
34 if (c >= 'a' && c <= 'f')
35 return c - 'a' + 10;
36 if (c >= 'A' && c <= 'F')
37 return c - 'A' + 10;
38 return ~0;
39 }
40
41 int get_sha1_hex(const char *hex, unsigned char *sha1)
42 {
43 int i;
44 for (i = 0; i < 20; i++) {
45 unsigned int val = (hexval(hex[0]) << 4) | hexval(hex[1]);
46 if (val & ~0xff)
47 return -1;
48 *sha1++ = val;
49 hex += 2;
50 }
51 return 0;
52 }
53
54 int adjust_shared_perm(const char *path)
55 {
56 struct stat st;
57 int mode;
58
59 if (!shared_repository)
60 return 0;
61 if (lstat(path, &st) < 0)
62 return -1;
63 mode = st.st_mode;
64 if (mode & S_IRUSR)
65 mode |= S_IRGRP;
66 if (mode & S_IWUSR)
67 mode |= S_IWGRP;
68 if (mode & S_IXUSR)
69 mode |= S_IXGRP;
70 if (S_ISDIR(mode))
71 mode |= S_ISGID;
72 if (chmod(path, mode) < 0)
73 return -2;
74 return 0;
75 }
76
77 int safe_create_leading_directories(char *path)
78 {
79 char *pos = path;
80 struct stat st;
81
82 if (*pos == '/')
83 pos++;
84
85 while (pos) {
86 pos = strchr(pos, '/');
87 if (!pos)
88 break;
89 *pos = 0;
90 if (!stat(path, &st)) {
91 /* path exists */
92 if (!S_ISDIR(st.st_mode)) {
93 *pos = '/';
94 return -3;
95 }
96 }
97 else if (mkdir(path, 0777)) {
98 *pos = '/';
99 return -1;
100 }
101 else if (adjust_shared_perm(path)) {
102 *pos = '/';
103 return -2;
104 }
105 *pos++ = '/';
106 }
107 return 0;
108 }
109
110 char * sha1_to_hex(const unsigned char *sha1)
111 {
112 static int bufno;
113 static char hexbuffer[4][50];
114 static const char hex[] = "0123456789abcdef";
115 char *buffer = hexbuffer[3 & ++bufno], *buf = buffer;
116 int i;
117
118 for (i = 0; i < 20; i++) {
119 unsigned int val = *sha1++;
120 *buf++ = hex[val >> 4];
121 *buf++ = hex[val & 0xf];
122 }
123 *buf = '\0';
124
125 return buffer;
126 }
127
128 static void fill_sha1_path(char *pathbuf, const unsigned char *sha1)
129 {
130 int i;
131 for (i = 0; i < 20; i++) {
132 static char hex[] = "0123456789abcdef";
133 unsigned int val = sha1[i];
134 char *pos = pathbuf + i*2 + (i > 0);
135 *pos++ = hex[val >> 4];
136 *pos = hex[val & 0xf];
137 }
138 }
139
140 /*
141 * NOTE! This returns a statically allocated buffer, so you have to be
142 * careful about using it. Do a "strdup()" if you need to save the
143 * filename.
144 *
145 * Also note that this returns the location for creating. Reading
146 * SHA1 file can happen from any alternate directory listed in the
147 * DB_ENVIRONMENT environment variable if it is not found in
148 * the primary object database.
149 */
150 char *sha1_file_name(const unsigned char *sha1)
151 {
152 static char *name, *base;
153
154 if (!base) {
155 const char *sha1_file_directory = get_object_directory();
156 int len = strlen(sha1_file_directory);
157 base = xmalloc(len + 60);
158 memcpy(base, sha1_file_directory, len);
159 memset(base+len, 0, 60);
160 base[len] = '/';
161 base[len+3] = '/';
162 name = base + len + 1;
163 }
164 fill_sha1_path(name, sha1);
165 return base;
166 }
167
168 char *sha1_pack_name(const unsigned char *sha1)
169 {
170 static const char hex[] = "0123456789abcdef";
171 static char *name, *base, *buf;
172 int i;
173
174 if (!base) {
175 const char *sha1_file_directory = get_object_directory();
176 int len = strlen(sha1_file_directory);
177 base = xmalloc(len + 60);
178 sprintf(base, "%s/pack/pack-1234567890123456789012345678901234567890.pack", sha1_file_directory);
179 name = base + len + 11;
180 }
181
182 buf = name;
183
184 for (i = 0; i < 20; i++) {
185 unsigned int val = *sha1++;
186 *buf++ = hex[val >> 4];
187 *buf++ = hex[val & 0xf];
188 }
189
190 return base;
191 }
192
193 char *sha1_pack_index_name(const unsigned char *sha1)
194 {
195 static const char hex[] = "0123456789abcdef";
196 static char *name, *base, *buf;
197 int i;
198
199 if (!base) {
200 const char *sha1_file_directory = get_object_directory();
201 int len = strlen(sha1_file_directory);
202 base = xmalloc(len + 60);
203 sprintf(base, "%s/pack/pack-1234567890123456789012345678901234567890.idx", sha1_file_directory);
204 name = base + len + 11;
205 }
206
207 buf = name;
208
209 for (i = 0; i < 20; i++) {
210 unsigned int val = *sha1++;
211 *buf++ = hex[val >> 4];
212 *buf++ = hex[val & 0xf];
213 }
214
215 return base;
216 }
217
218 struct alternate_object_database *alt_odb_list;
219 static struct alternate_object_database **alt_odb_tail;
220
221 static void read_info_alternates(const char * alternates, int depth);
222
223 /*
224 * Prepare alternate object database registry.
225 *
226 * The variable alt_odb_list points at the list of struct
227 * alternate_object_database. The elements on this list come from
228 * non-empty elements from colon separated ALTERNATE_DB_ENVIRONMENT
229 * environment variable, and $GIT_OBJECT_DIRECTORY/info/alternates,
230 * whose contents is similar to that environment variable but can be
231 * LF separated. Its base points at a statically allocated buffer that
232 * contains "/the/directory/corresponding/to/.git/objects/...", while
233 * its name points just after the slash at the end of ".git/objects/"
234 * in the example above, and has enough space to hold 40-byte hex
235 * SHA1, an extra slash for the first level indirection, and the
236 * terminating NUL.
237 */
238 static int link_alt_odb_entry(const char * entry, int len, const char * relative_base, int depth)
239 {
240 struct stat st;
241 const char *objdir = get_object_directory();
242 struct alternate_object_database *ent;
243 struct alternate_object_database *alt;
244 /* 43 = 40-byte + 2 '/' + terminating NUL */
245 int pfxlen = len;
246 int entlen = pfxlen + 43;
247 int base_len = -1;
248
249 if (*entry != '/' && relative_base) {
250 /* Relative alt-odb */
251 if (base_len < 0)
252 base_len = strlen(relative_base) + 1;
253 entlen += base_len;
254 pfxlen += base_len;
255 }
256 ent = xmalloc(sizeof(*ent) + entlen);
257
258 if (*entry != '/' && relative_base) {
259 memcpy(ent->base, relative_base, base_len - 1);
260 ent->base[base_len - 1] = '/';
261 memcpy(ent->base + base_len, entry, len);
262 }
263 else
264 memcpy(ent->base, entry, pfxlen);
265
266 ent->name = ent->base + pfxlen + 1;
267 ent->base[pfxlen + 3] = '/';
268 ent->base[pfxlen] = ent->base[entlen-1] = 0;
269
270 /* Detect cases where alternate disappeared */
271 if (stat(ent->base, &st) || !S_ISDIR(st.st_mode)) {
272 error("object directory %s does not exist; "
273 "check .git/objects/info/alternates.",
274 ent->base);
275 free(ent);
276 return -1;
277 }
278
279 /* Prevent the common mistake of listing the same
280 * thing twice, or object directory itself.
281 */
282 for (alt = alt_odb_list; alt; alt = alt->next) {
283 if (!memcmp(ent->base, alt->base, pfxlen)) {
284 free(ent);
285 return -1;
286 }
287 }
288 if (!memcmp(ent->base, objdir, pfxlen)) {
289 free(ent);
290 return -1;
291 }
292
293 /* add the alternate entry */
294 *alt_odb_tail = ent;
295 alt_odb_tail = &(ent->next);
296 ent->next = NULL;
297
298 /* recursively add alternates */
299 read_info_alternates(ent->base, depth + 1);
300
301 ent->base[pfxlen] = '/';
302
303 return 0;
304 }
305
306 static void link_alt_odb_entries(const char *alt, const char *ep, int sep,
307 const char *relative_base, int depth)
308 {
309 const char *cp, *last;
310
311 if (depth > 5) {
312 error("%s: ignoring alternate object stores, nesting too deep.",
313 relative_base);
314 return;
315 }
316
317 last = alt;
318 while (last < ep) {
319 cp = last;
320 if (cp < ep && *cp == '#') {
321 while (cp < ep && *cp != sep)
322 cp++;
323 last = cp + 1;
324 continue;
325 }
326 while (cp < ep && *cp != sep)
327 cp++;
328 if (last != cp) {
329 if ((*last != '/') && depth) {
330 error("%s: ignoring relative alternate object store %s",
331 relative_base, last);
332 } else {
333 link_alt_odb_entry(last, cp - last,
334 relative_base, depth);
335 }
336 }
337 while (cp < ep && *cp == sep)
338 cp++;
339 last = cp;
340 }
341 }
342
343 static void read_info_alternates(const char * relative_base, int depth)
344 {
345 char *map;
346 struct stat st;
347 char path[PATH_MAX];
348 int fd;
349
350 sprintf(path, "%s/info/alternates", relative_base);
351 fd = open(path, O_RDONLY);
352 if (fd < 0)
353 return;
354 if (fstat(fd, &st) || (st.st_size == 0)) {
355 close(fd);
356 return;
357 }
358 map = mmap(NULL, st.st_size, PROT_READ, MAP_PRIVATE, fd, 0);
359 close(fd);
360 if (map == MAP_FAILED)
361 return;
362
363 link_alt_odb_entries(map, map + st.st_size, '\n', relative_base, depth);
364
365 munmap(map, st.st_size);
366 }
367
368 void prepare_alt_odb(void)
369 {
370 char *alt;
371
372 alt = getenv(ALTERNATE_DB_ENVIRONMENT);
373 if (!alt) alt = "";
374
375 if (alt_odb_tail)
376 return;
377 alt_odb_tail = &alt_odb_list;
378 link_alt_odb_entries(alt, alt + strlen(alt), ':', NULL, 0);
379
380 read_info_alternates(get_object_directory(), 0);
381 }
382
383 static char *find_sha1_file(const unsigned char *sha1, struct stat *st)
384 {
385 char *name = sha1_file_name(sha1);
386 struct alternate_object_database *alt;
387
388 if (!stat(name, st))
389 return name;
390 prepare_alt_odb();
391 for (alt = alt_odb_list; alt; alt = alt->next) {
392 name = alt->name;
393 fill_sha1_path(name, sha1);
394 if (!stat(alt->base, st))
395 return alt->base;
396 }
397 return NULL;
398 }
399
400 #define PACK_MAX_SZ (1<<26)
401 static int pack_used_ctr;
402 static unsigned long pack_mapped;
403 struct packed_git *packed_git;
404
405 static int check_packed_git_idx(const char *path, unsigned long *idx_size_,
406 void **idx_map_)
407 {
408 void *idx_map;
409 unsigned int *index;
410 unsigned long idx_size;
411 int nr, i;
412 int fd = open(path, O_RDONLY);
413 struct stat st;
414 if (fd < 0)
415 return -1;
416 if (fstat(fd, &st)) {
417 close(fd);
418 return -1;
419 }
420 idx_size = st.st_size;
421 idx_map = mmap(NULL, idx_size, PROT_READ, MAP_PRIVATE, fd, 0);
422 close(fd);
423 if (idx_map == MAP_FAILED)
424 return -1;
425
426 index = idx_map;
427 *idx_map_ = idx_map;
428 *idx_size_ = idx_size;
429
430 /* check index map */
431 if (idx_size < 4*256 + 20 + 20)
432 return error("index file too small");
433 nr = 0;
434 for (i = 0; i < 256; i++) {
435 unsigned int n = ntohl(index[i]);
436 if (n < nr)
437 return error("non-monotonic index");
438 nr = n;
439 }
440
441 /*
442 * Total size:
443 * - 256 index entries 4 bytes each
444 * - 24-byte entries * nr (20-byte sha1 + 4-byte offset)
445 * - 20-byte SHA1 of the packfile
446 * - 20-byte SHA1 file checksum
447 */
448 if (idx_size != 4*256 + nr * 24 + 20 + 20)
449 return error("wrong index file size");
450
451 return 0;
452 }
453
454 static int unuse_one_packed_git(void)
455 {
456 struct packed_git *p, *lru = NULL;
457
458 for (p = packed_git; p; p = p->next) {
459 if (p->pack_use_cnt || !p->pack_base)
460 continue;
461 if (!lru || p->pack_last_used < lru->pack_last_used)
462 lru = p;
463 }
464 if (!lru)
465 return 0;
466 munmap(lru->pack_base, lru->pack_size);
467 lru->pack_base = NULL;
468 return 1;
469 }
470
471 void unuse_packed_git(struct packed_git *p)
472 {
473 p->pack_use_cnt--;
474 }
475
476 int use_packed_git(struct packed_git *p)
477 {
478 if (!p->pack_size) {
479 struct stat st;
480 // We created the struct before we had the pack
481 stat(p->pack_name, &st);
482 if (!S_ISREG(st.st_mode))
483 die("packfile %s not a regular file", p->pack_name);
484 p->pack_size = st.st_size;
485 }
486 if (!p->pack_base) {
487 int fd;
488 struct stat st;
489 void *map;
490
491 pack_mapped += p->pack_size;
492 while (PACK_MAX_SZ < pack_mapped && unuse_one_packed_git())
493 ; /* nothing */
494 fd = open(p->pack_name, O_RDONLY);
495 if (fd < 0)
496 die("packfile %s cannot be opened", p->pack_name);
497 if (fstat(fd, &st)) {
498 close(fd);
499 die("packfile %s cannot be opened", p->pack_name);
500 }
501 if (st.st_size != p->pack_size)
502 die("packfile %s size mismatch.", p->pack_name);
503 map = mmap(NULL, p->pack_size, PROT_READ, MAP_PRIVATE, fd, 0);
504 close(fd);
505 if (map == MAP_FAILED)
506 die("packfile %s cannot be mapped.", p->pack_name);
507 p->pack_base = map;
508
509 /* Check if the pack file matches with the index file.
510 * this is cheap.
511 */
512 if (memcmp((char*)(p->index_base) + p->index_size - 40,
513 p->pack_base + p->pack_size - 20, 20)) {
514
515 die("packfile %s does not match index.", p->pack_name);
516 }
517 }
518 p->pack_last_used = pack_used_ctr++;
519 p->pack_use_cnt++;
520 return 0;
521 }
522
523 struct packed_git *add_packed_git(char *path, int path_len, int local)
524 {
525 struct stat st;
526 struct packed_git *p;
527 unsigned long idx_size;
528 void *idx_map;
529 unsigned char sha1[20];
530
531 if (check_packed_git_idx(path, &idx_size, &idx_map))
532 return NULL;
533
534 /* do we have a corresponding .pack file? */
535 strcpy(path + path_len - 4, ".pack");
536 if (stat(path, &st) || !S_ISREG(st.st_mode)) {
537 munmap(idx_map, idx_size);
538 return NULL;
539 }
540 /* ok, it looks sane as far as we can check without
541 * actually mapping the pack file.
542 */
543 p = xmalloc(sizeof(*p) + path_len + 2);
544 strcpy(p->pack_name, path);
545 p->index_size = idx_size;
546 p->pack_size = st.st_size;
547 p->index_base = idx_map;
548 p->next = NULL;
549 p->pack_base = NULL;
550 p->pack_last_used = 0;
551 p->pack_use_cnt = 0;
552 p->pack_local = local;
553 if ((path_len > 44) && !get_sha1_hex(path + path_len - 44, sha1))
554 memcpy(p->sha1, sha1, 20);
555 return p;
556 }
557
558 struct packed_git *parse_pack_index(unsigned char *sha1)
559 {
560 char *path = sha1_pack_index_name(sha1);
561 return parse_pack_index_file(sha1, path);
562 }
563
564 struct packed_git *parse_pack_index_file(const unsigned char *sha1, char *idx_path)
565 {
566 struct packed_git *p;
567 unsigned long idx_size;
568 void *idx_map;
569 char *path;
570
571 if (check_packed_git_idx(idx_path, &idx_size, &idx_map))
572 return NULL;
573
574 path = sha1_pack_name(sha1);
575
576 p = xmalloc(sizeof(*p) + strlen(path) + 2);
577 strcpy(p->pack_name, path);
578 p->index_size = idx_size;
579 p->pack_size = 0;
580 p->index_base = idx_map;
581 p->next = NULL;
582 p->pack_base = NULL;
583 p->pack_last_used = 0;
584 p->pack_use_cnt = 0;
585 memcpy(p->sha1, sha1, 20);
586 return p;
587 }
588
589 void install_packed_git(struct packed_git *pack)
590 {
591 pack->next = packed_git;
592 packed_git = pack;
593 }
594
595 static void prepare_packed_git_one(char *objdir, int local)
596 {
597 char path[PATH_MAX];
598 int len;
599 DIR *dir;
600 struct dirent *de;
601
602 sprintf(path, "%s/pack", objdir);
603 len = strlen(path);
604 dir = opendir(path);
605 if (!dir) {
606 if (errno != ENOENT)
607 error("unable to open object pack directory: %s: %s",
608 path, strerror(errno));
609 return;
610 }
611 path[len++] = '/';
612 while ((de = readdir(dir)) != NULL) {
613 int namelen = strlen(de->d_name);
614 struct packed_git *p;
615
616 if (strcmp(de->d_name + namelen - 4, ".idx"))
617 continue;
618
619 /* we have .idx. Is it a file we can map? */
620 strcpy(path + len, de->d_name);
621 p = add_packed_git(path, len + namelen, local);
622 if (!p)
623 continue;
624 p->next = packed_git;
625 packed_git = p;
626 }
627 closedir(dir);
628 }
629
630 void prepare_packed_git(void)
631 {
632 static int run_once = 0;
633 struct alternate_object_database *alt;
634
635 if (run_once)
636 return;
637 prepare_packed_git_one(get_object_directory(), 1);
638 prepare_alt_odb();
639 for (alt = alt_odb_list; alt; alt = alt->next) {
640 alt->name[-1] = 0;
641 prepare_packed_git_one(alt->base, 0);
642 alt->name[-1] = '/';
643 }
644 run_once = 1;
645 }
646
647 int check_sha1_signature(const unsigned char *sha1, void *map, unsigned long size, const char *type)
648 {
649 char header[100];
650 unsigned char real_sha1[20];
651 SHA_CTX c;
652
653 SHA1_Init(&c);
654 SHA1_Update(&c, header, 1+sprintf(header, "%s %lu", type, size));
655 SHA1_Update(&c, map, size);
656 SHA1_Final(real_sha1, &c);
657 return memcmp(sha1, real_sha1, 20) ? -1 : 0;
658 }
659
660 static void *map_sha1_file_internal(const unsigned char *sha1,
661 unsigned long *size)
662 {
663 struct stat st;
664 void *map;
665 int fd;
666 char *filename = find_sha1_file(sha1, &st);
667
668 if (!filename) {
669 return NULL;
670 }
671
672 fd = open(filename, O_RDONLY | sha1_file_open_flag);
673 if (fd < 0) {
674 /* See if it works without O_NOATIME */
675 switch (sha1_file_open_flag) {
676 default:
677 fd = open(filename, O_RDONLY);
678 if (fd >= 0)
679 break;
680 /* Fallthrough */
681 case 0:
682 return NULL;
683 }
684
685 /* If it failed once, it will probably fail again.
686 * Stop using O_NOATIME
687 */
688 sha1_file_open_flag = 0;
689 }
690 map = mmap(NULL, st.st_size, PROT_READ, MAP_PRIVATE, fd, 0);
691 close(fd);
692 if (map == MAP_FAILED)
693 return NULL;
694 *size = st.st_size;
695 return map;
696 }
697
698 int unpack_sha1_header(z_stream *stream, void *map, unsigned long mapsize, void *buffer, unsigned long size)
699 {
700 /* Get the data stream */
701 memset(stream, 0, sizeof(*stream));
702 stream->next_in = map;
703 stream->avail_in = mapsize;
704 stream->next_out = buffer;
705 stream->avail_out = size;
706
707 inflateInit(stream);
708 return inflate(stream, 0);
709 }
710
711 static void *unpack_sha1_rest(z_stream *stream, void *buffer, unsigned long size)
712 {
713 int bytes = strlen(buffer) + 1;
714 unsigned char *buf = xmalloc(1+size);
715
716 memcpy(buf, buffer + bytes, stream->total_out - bytes);
717 bytes = stream->total_out - bytes;
718 if (bytes < size) {
719 stream->next_out = buf + bytes;
720 stream->avail_out = size - bytes;
721 while (inflate(stream, Z_FINISH) == Z_OK)
722 /* nothing */;
723 }
724 buf[size] = 0;
725 inflateEnd(stream);
726 return buf;
727 }
728
729 /*
730 * We used to just use "sscanf()", but that's actually way
731 * too permissive for what we want to check. So do an anal
732 * object header parse by hand.
733 */
734 int parse_sha1_header(char *hdr, char *type, unsigned long *sizep)
735 {
736 int i;
737 unsigned long size;
738
739 /*
740 * The type can be at most ten bytes (including the
741 * terminating '\0' that we add), and is followed by
742 * a space.
743 */
744 i = 10;
745 for (;;) {
746 char c = *hdr++;
747 if (c == ' ')
748 break;
749 if (!--i)
750 return -1;
751 *type++ = c;
752 }
753 *type = 0;
754
755 /*
756 * The length must follow immediately, and be in canonical
757 * decimal format (ie "010" is not valid).
758 */
759 size = *hdr++ - '0';
760 if (size > 9)
761 return -1;
762 if (size) {
763 for (;;) {
764 unsigned long c = *hdr - '0';
765 if (c > 9)
766 break;
767 hdr++;
768 size = size * 10 + c;
769 }
770 }
771 *sizep = size;
772
773 /*
774 * The length must be followed by a zero byte
775 */
776 return *hdr ? -1 : 0;
777 }
778
779 void * unpack_sha1_file(void *map, unsigned long mapsize, char *type, unsigned long *size)
780 {
781 int ret;
782 z_stream stream;
783 char hdr[8192];
784
785 ret = unpack_sha1_header(&stream, map, mapsize, hdr, sizeof(hdr));
786 if (ret < Z_OK || parse_sha1_header(hdr, type, size) < 0)
787 return NULL;
788
789 return unpack_sha1_rest(&stream, hdr, *size);
790 }
791
792 /* forward declaration for a mutually recursive function */
793 static int packed_object_info(struct pack_entry *entry,
794 char *type, unsigned long *sizep);
795
796 static int packed_delta_info(unsigned char *base_sha1,
797 unsigned long delta_size,
798 unsigned long left,
799 char *type,
800 unsigned long *sizep,
801 struct packed_git *p)
802 {
803 struct pack_entry base_ent;
804
805 if (left < 20)
806 die("truncated pack file");
807
808 /* The base entry _must_ be in the same pack */
809 if (!find_pack_entry_one(base_sha1, &base_ent, p))
810 die("failed to find delta-pack base object %s",
811 sha1_to_hex(base_sha1));
812
813 /* We choose to only get the type of the base object and
814 * ignore potentially corrupt pack file that expects the delta
815 * based on a base with a wrong size. This saves tons of
816 * inflate() calls.
817 */
818
819 if (packed_object_info(&base_ent, type, NULL))
820 die("cannot get info for delta-pack base");
821
822 if (sizep) {
823 const unsigned char *data;
824 unsigned char delta_head[64];
825 unsigned long result_size;
826 z_stream stream;
827 int st;
828
829 memset(&stream, 0, sizeof(stream));
830
831 data = stream.next_in = base_sha1 + 20;
832 stream.avail_in = left - 20;
833 stream.next_out = delta_head;
834 stream.avail_out = sizeof(delta_head);
835
836 inflateInit(&stream);
837 st = inflate(&stream, Z_FINISH);
838 inflateEnd(&stream);
839 if ((st != Z_STREAM_END) &&
840 stream.total_out != sizeof(delta_head))
841 die("delta data unpack-initial failed");
842
843 /* Examine the initial part of the delta to figure out
844 * the result size.
845 */
846 data = delta_head;
847
848 /* ignore base size */
849 get_delta_hdr_size(&data, delta_head+sizeof(delta_head));
850
851 /* Read the result size */
852 result_size = get_delta_hdr_size(&data, delta_head+sizeof(delta_head));
853 *sizep = result_size;
854 }
855 return 0;
856 }
857
858 static unsigned long unpack_object_header(struct packed_git *p, unsigned long offset,
859 enum object_type *type, unsigned long *sizep)
860 {
861 unsigned shift;
862 unsigned char *pack, c;
863 unsigned long size;
864
865 if (offset >= p->pack_size)
866 die("object offset outside of pack file");
867
868 pack = p->pack_base + offset;
869 c = *pack++;
870 offset++;
871 *type = (c >> 4) & 7;
872 size = c & 15;
873 shift = 4;
874 while (c & 0x80) {
875 if (offset >= p->pack_size)
876 die("object offset outside of pack file");
877 c = *pack++;
878 offset++;
879 size += (c & 0x7f) << shift;
880 shift += 7;
881 }
882 *sizep = size;
883 return offset;
884 }
885
886 int check_reuse_pack_delta(struct packed_git *p, unsigned long offset,
887 unsigned char *base, unsigned long *sizep,
888 enum object_type *kindp)
889 {
890 unsigned long ptr;
891 int status = -1;
892
893 use_packed_git(p);
894 ptr = offset;
895 ptr = unpack_object_header(p, ptr, kindp, sizep);
896 if (*kindp != OBJ_DELTA)
897 goto done;
898 memcpy(base, p->pack_base + ptr, 20);
899 status = 0;
900 done:
901 unuse_packed_git(p);
902 return status;
903 }
904
905 void packed_object_info_detail(struct pack_entry *e,
906 char *type,
907 unsigned long *size,
908 unsigned long *store_size,
909 unsigned int *delta_chain_length,
910 unsigned char *base_sha1)
911 {
912 struct packed_git *p = e->p;
913 unsigned long offset;
914 unsigned char *pack;
915 enum object_type kind;
916
917 offset = unpack_object_header(p, e->offset, &kind, size);
918 pack = p->pack_base + offset;
919 if (kind != OBJ_DELTA)
920 *delta_chain_length = 0;
921 else {
922 unsigned int chain_length = 0;
923 if (p->pack_size <= offset + 20)
924 die("pack file %s records an incomplete delta base",
925 p->pack_name);
926 memcpy(base_sha1, pack, 20);
927 do {
928 struct pack_entry base_ent;
929 unsigned long junk;
930
931 find_pack_entry_one(pack, &base_ent, p);
932 offset = unpack_object_header(p, base_ent.offset,
933 &kind, &junk);
934 pack = p->pack_base + offset;
935 chain_length++;
936 } while (kind == OBJ_DELTA);
937 *delta_chain_length = chain_length;
938 }
939 switch (kind) {
940 case OBJ_COMMIT:
941 strcpy(type, commit_type);
942 break;
943 case OBJ_TREE:
944 strcpy(type, tree_type);
945 break;
946 case OBJ_BLOB:
947 strcpy(type, blob_type);
948 break;
949 case OBJ_TAG:
950 strcpy(type, tag_type);
951 break;
952 default:
953 die("corrupted pack file %s containing object of kind %d",
954 p->pack_name, kind);
955 }
956 *store_size = 0; /* notyet */
957 }
958
959 static int packed_object_info(struct pack_entry *entry,
960 char *type, unsigned long *sizep)
961 {
962 struct packed_git *p = entry->p;
963 unsigned long offset, size, left;
964 unsigned char *pack;
965 enum object_type kind;
966 int retval;
967
968 if (use_packed_git(p))
969 die("cannot map packed file");
970
971 offset = unpack_object_header(p, entry->offset, &kind, &size);
972 pack = p->pack_base + offset;
973 left = p->pack_size - offset;
974
975 switch (kind) {
976 case OBJ_DELTA:
977 retval = packed_delta_info(pack, size, left, type, sizep, p);
978 unuse_packed_git(p);
979 return retval;
980 case OBJ_COMMIT:
981 strcpy(type, commit_type);
982 break;
983 case OBJ_TREE:
984 strcpy(type, tree_type);
985 break;
986 case OBJ_BLOB:
987 strcpy(type, blob_type);
988 break;
989 case OBJ_TAG:
990 strcpy(type, tag_type);
991 break;
992 default:
993 die("corrupted pack file %s containing object of kind %d",
994 p->pack_name, kind);
995 }
996 if (sizep)
997 *sizep = size;
998 unuse_packed_git(p);
999 return 0;
1000 }
1001
1002 /* forward declaration for a mutually recursive function */
1003 static void *unpack_entry(struct pack_entry *, char *, unsigned long *);
1004
1005 static void *unpack_delta_entry(unsigned char *base_sha1,
1006 unsigned long delta_size,
1007 unsigned long left,
1008 char *type,
1009 unsigned long *sizep,
1010 struct packed_git *p)
1011 {
1012 struct pack_entry base_ent;
1013 void *data, *delta_data, *result, *base;
1014 unsigned long data_size, result_size, base_size;
1015 z_stream stream;
1016 int st;
1017
1018 if (left < 20)
1019 die("truncated pack file");
1020
1021 /* The base entry _must_ be in the same pack */
1022 if (!find_pack_entry_one(base_sha1, &base_ent, p))
1023 die("failed to find delta-pack base object %s",
1024 sha1_to_hex(base_sha1));
1025 base = unpack_entry_gently(&base_ent, type, &base_size);
1026 if (!base)
1027 die("failed to read delta-pack base object %s",
1028 sha1_to_hex(base_sha1));
1029
1030 data = base_sha1 + 20;
1031 data_size = left - 20;
1032 delta_data = xmalloc(delta_size);
1033
1034 memset(&stream, 0, sizeof(stream));
1035
1036 stream.next_in = data;
1037 stream.avail_in = data_size;
1038 stream.next_out = delta_data;
1039 stream.avail_out = delta_size;
1040
1041 inflateInit(&stream);
1042 st = inflate(&stream, Z_FINISH);
1043 inflateEnd(&stream);
1044 if ((st != Z_STREAM_END) || stream.total_out != delta_size)
1045 die("delta data unpack failed");
1046
1047 result = patch_delta(base, base_size,
1048 delta_data, delta_size,
1049 &result_size);
1050 if (!result)
1051 die("failed to apply delta");
1052 free(delta_data);
1053 free(base);
1054 *sizep = result_size;
1055 return result;
1056 }
1057
1058 static void *unpack_non_delta_entry(unsigned char *data,
1059 unsigned long size,
1060 unsigned long left)
1061 {
1062 int st;
1063 z_stream stream;
1064 unsigned char *buffer;
1065
1066 buffer = xmalloc(size + 1);
1067 buffer[size] = 0;
1068 memset(&stream, 0, sizeof(stream));
1069 stream.next_in = data;
1070 stream.avail_in = left;
1071 stream.next_out = buffer;
1072 stream.avail_out = size;
1073
1074 inflateInit(&stream);
1075 st = inflate(&stream, Z_FINISH);
1076 inflateEnd(&stream);
1077 if ((st != Z_STREAM_END) || stream.total_out != size) {
1078 free(buffer);
1079 return NULL;
1080 }
1081
1082 return buffer;
1083 }
1084
1085 static void *unpack_entry(struct pack_entry *entry,
1086 char *type, unsigned long *sizep)
1087 {
1088 struct packed_git *p = entry->p;
1089 void *retval;
1090
1091 if (use_packed_git(p))
1092 die("cannot map packed file");
1093 retval = unpack_entry_gently(entry, type, sizep);
1094 unuse_packed_git(p);
1095 if (!retval)
1096 die("corrupted pack file %s", p->pack_name);
1097 return retval;
1098 }
1099
1100 /* The caller is responsible for use_packed_git()/unuse_packed_git() pair */
1101 void *unpack_entry_gently(struct pack_entry *entry,
1102 char *type, unsigned long *sizep)
1103 {
1104 struct packed_git *p = entry->p;
1105 unsigned long offset, size, left;
1106 unsigned char *pack;
1107 enum object_type kind;
1108 void *retval;
1109
1110 offset = unpack_object_header(p, entry->offset, &kind, &size);
1111 pack = p->pack_base + offset;
1112 left = p->pack_size - offset;
1113 switch (kind) {
1114 case OBJ_DELTA:
1115 retval = unpack_delta_entry(pack, size, left, type, sizep, p);
1116 return retval;
1117 case OBJ_COMMIT:
1118 strcpy(type, commit_type);
1119 break;
1120 case OBJ_TREE:
1121 strcpy(type, tree_type);
1122 break;
1123 case OBJ_BLOB:
1124 strcpy(type, blob_type);
1125 break;
1126 case OBJ_TAG:
1127 strcpy(type, tag_type);
1128 break;
1129 default:
1130 return NULL;
1131 }
1132 *sizep = size;
1133 retval = unpack_non_delta_entry(pack, size, left);
1134 return retval;
1135 }
1136
1137 int num_packed_objects(const struct packed_git *p)
1138 {
1139 /* See check_packed_git_idx() */
1140 return (p->index_size - 20 - 20 - 4*256) / 24;
1141 }
1142
1143 int nth_packed_object_sha1(const struct packed_git *p, int n,
1144 unsigned char* sha1)
1145 {
1146 void *index = p->index_base + 256;
1147 if (n < 0 || num_packed_objects(p) <= n)
1148 return -1;
1149 memcpy(sha1, (index + 24 * n + 4), 20);
1150 return 0;
1151 }
1152
1153 int find_pack_entry_one(const unsigned char *sha1,
1154 struct pack_entry *e, struct packed_git *p)
1155 {
1156 unsigned int *level1_ofs = p->index_base;
1157 int hi = ntohl(level1_ofs[*sha1]);
1158 int lo = ((*sha1 == 0x0) ? 0 : ntohl(level1_ofs[*sha1 - 1]));
1159 void *index = p->index_base + 256;
1160
1161 do {
1162 int mi = (lo + hi) / 2;
1163 int cmp = memcmp(index + 24 * mi + 4, sha1, 20);
1164 if (!cmp) {
1165 e->offset = ntohl(*((uint32_t *)(index + 24 * mi)));
1166 memcpy(e->sha1, sha1, 20);
1167 e->p = p;
1168 return 1;
1169 }
1170 if (cmp > 0)
1171 hi = mi;
1172 else
1173 lo = mi+1;
1174 } while (lo < hi);
1175 return 0;
1176 }
1177
1178 static int find_pack_entry(const unsigned char *sha1, struct pack_entry *e)
1179 {
1180 struct packed_git *p;
1181 prepare_packed_git();
1182
1183 for (p = packed_git; p; p = p->next) {
1184 if (find_pack_entry_one(sha1, e, p))
1185 return 1;
1186 }
1187 return 0;
1188 }
1189
1190 struct packed_git *find_sha1_pack(const unsigned char *sha1,
1191 struct packed_git *packs)
1192 {
1193 struct packed_git *p;
1194 struct pack_entry e;
1195
1196 for (p = packs; p; p = p->next) {
1197 if (find_pack_entry_one(sha1, &e, p))
1198 return p;
1199 }
1200 return NULL;
1201
1202 }
1203
1204 int sha1_object_info(const unsigned char *sha1, char *type, unsigned long *sizep)
1205 {
1206 int status;
1207 unsigned long mapsize, size;
1208 void *map;
1209 z_stream stream;
1210 char hdr[128];
1211
1212 map = map_sha1_file_internal(sha1, &mapsize);
1213 if (!map) {
1214 struct pack_entry e;
1215
1216 if (!find_pack_entry(sha1, &e))
1217 return error("unable to find %s", sha1_to_hex(sha1));
1218 return packed_object_info(&e, type, sizep);
1219 }
1220 if (unpack_sha1_header(&stream, map, mapsize, hdr, sizeof(hdr)) < 0)
1221 status = error("unable to unpack %s header",
1222 sha1_to_hex(sha1));
1223 if (parse_sha1_header(hdr, type, &size) < 0)
1224 status = error("unable to parse %s header", sha1_to_hex(sha1));
1225 else {
1226 status = 0;
1227 if (sizep)
1228 *sizep = size;
1229 }
1230 inflateEnd(&stream);
1231 munmap(map, mapsize);
1232 return status;
1233 }
1234
1235 static void *read_packed_sha1(const unsigned char *sha1, char *type, unsigned long *size)
1236 {
1237 struct pack_entry e;
1238
1239 if (!find_pack_entry(sha1, &e)) {
1240 error("cannot read sha1_file for %s", sha1_to_hex(sha1));
1241 return NULL;
1242 }
1243 return unpack_entry(&e, type, size);
1244 }
1245
1246 void * read_sha1_file(const unsigned char *sha1, char *type, unsigned long *size)
1247 {
1248 unsigned long mapsize;
1249 void *map, *buf;
1250 struct pack_entry e;
1251
1252 if (find_pack_entry(sha1, &e))
1253 return read_packed_sha1(sha1, type, size);
1254 map = map_sha1_file_internal(sha1, &mapsize);
1255 if (map) {
1256 buf = unpack_sha1_file(map, mapsize, type, size);
1257 munmap(map, mapsize);
1258 return buf;
1259 }
1260 return NULL;
1261 }
1262
1263 void *read_object_with_reference(const unsigned char *sha1,
1264 const char *required_type,
1265 unsigned long *size,
1266 unsigned char *actual_sha1_return)
1267 {
1268 char type[20];
1269 void *buffer;
1270 unsigned long isize;
1271 unsigned char actual_sha1[20];
1272
1273 memcpy(actual_sha1, sha1, 20);
1274 while (1) {
1275 int ref_length = -1;
1276 const char *ref_type = NULL;
1277
1278 buffer = read_sha1_file(actual_sha1, type, &isize);
1279 if (!buffer)
1280 return NULL;
1281 if (!strcmp(type, required_type)) {
1282 *size = isize;
1283 if (actual_sha1_return)
1284 memcpy(actual_sha1_return, actual_sha1, 20);
1285 return buffer;
1286 }
1287 /* Handle references */
1288 else if (!strcmp(type, commit_type))
1289 ref_type = "tree ";
1290 else if (!strcmp(type, tag_type))
1291 ref_type = "object ";
1292 else {
1293 free(buffer);
1294 return NULL;
1295 }
1296 ref_length = strlen(ref_type);
1297
1298 if (memcmp(buffer, ref_type, ref_length) ||
1299 get_sha1_hex(buffer + ref_length, actual_sha1)) {
1300 free(buffer);
1301 return NULL;
1302 }
1303 free(buffer);
1304 /* Now we have the ID of the referred-to object in
1305 * actual_sha1. Check again. */
1306 }
1307 }
1308
1309 char *write_sha1_file_prepare(void *buf,
1310 unsigned long len,
1311 const char *type,
1312 unsigned char *sha1,
1313 unsigned char *hdr,
1314 int *hdrlen)
1315 {
1316 SHA_CTX c;
1317
1318 /* Generate the header */
1319 *hdrlen = sprintf((char *)hdr, "%s %lu", type, len)+1;
1320
1321 /* Sha1.. */
1322 SHA1_Init(&c);
1323 SHA1_Update(&c, hdr, *hdrlen);
1324 SHA1_Update(&c, buf, len);
1325 SHA1_Final(sha1, &c);
1326
1327 return sha1_file_name(sha1);
1328 }
1329
1330 /*
1331 * Link the tempfile to the final place, possibly creating the
1332 * last directory level as you do so.
1333 *
1334 * Returns the errno on failure, 0 on success.
1335 */
1336 static int link_temp_to_file(const char *tmpfile, char *filename)
1337 {
1338 int ret;
1339
1340 if (!link(tmpfile, filename))
1341 return 0;
1342
1343 /*
1344 * Try to mkdir the last path component if that failed
1345 * with an ENOENT.
1346 *
1347 * Re-try the "link()" regardless of whether the mkdir
1348 * succeeds, since a race might mean that somebody
1349 * else succeeded.
1350 */
1351 ret = errno;
1352 if (ret == ENOENT) {
1353 char *dir = strrchr(filename, '/');
1354 if (dir) {
1355 *dir = 0;
1356 mkdir(filename, 0777);
1357 if (adjust_shared_perm(filename))
1358 return -2;
1359 *dir = '/';
1360 if (!link(tmpfile, filename))
1361 return 0;
1362 ret = errno;
1363 }
1364 }
1365 return ret;
1366 }
1367
1368 /*
1369 * Move the just written object into its final resting place
1370 */
1371 int move_temp_to_file(const char *tmpfile, char *filename)
1372 {
1373 int ret = link_temp_to_file(tmpfile, filename);
1374
1375 /*
1376 * Coda hack - coda doesn't like cross-directory links,
1377 * so we fall back to a rename, which will mean that it
1378 * won't be able to check collisions, but that's not a
1379 * big deal.
1380 *
1381 * The same holds for FAT formatted media.
1382 *
1383 * When this succeeds, we just return 0. We have nothing
1384 * left to unlink.
1385 */
1386 if (ret && ret != EEXIST) {
1387 if (!rename(tmpfile, filename))
1388 return 0;
1389 ret = errno;
1390 }
1391 unlink(tmpfile);
1392 if (ret) {
1393 if (ret != EEXIST) {
1394 fprintf(stderr, "unable to write sha1 filename %s: %s\n", filename, strerror(ret));
1395 return -1;
1396 }
1397 /* FIXME!!! Collision check here ? */
1398 }
1399
1400 return 0;
1401 }
1402
1403 int write_sha1_file(void *buf, unsigned long len, const char *type, unsigned char *returnsha1)
1404 {
1405 int size;
1406 unsigned char *compressed;
1407 z_stream stream;
1408 unsigned char sha1[20];
1409 char *filename;
1410 static char tmpfile[PATH_MAX];
1411 unsigned char hdr[50];
1412 int fd, hdrlen;
1413
1414 /* Normally if we have it in the pack then we do not bother writing
1415 * it out into .git/objects/??/?{38} file.
1416 */
1417 filename = write_sha1_file_prepare(buf, len, type, sha1, hdr, &hdrlen);
1418 if (returnsha1)
1419 memcpy(returnsha1, sha1, 20);
1420 if (has_sha1_file(sha1))
1421 return 0;
1422 fd = open(filename, O_RDONLY);
1423 if (fd >= 0) {
1424 /*
1425 * FIXME!!! We might do collision checking here, but we'd
1426 * need to uncompress the old file and check it. Later.
1427 */
1428 close(fd);
1429 return 0;
1430 }
1431
1432 if (errno != ENOENT) {
1433 fprintf(stderr, "sha1 file %s: %s\n", filename, strerror(errno));
1434 return -1;
1435 }
1436
1437 snprintf(tmpfile, sizeof(tmpfile), "%s/obj_XXXXXX", get_object_directory());
1438
1439 fd = mkstemp(tmpfile);
1440 if (fd < 0) {
1441 fprintf(stderr, "unable to create temporary sha1 filename %s: %s\n", tmpfile, strerror(errno));
1442 return -1;
1443 }
1444
1445 /* Set it up */
1446 memset(&stream, 0, sizeof(stream));
1447 deflateInit(&stream, Z_BEST_COMPRESSION);
1448 size = deflateBound(&stream, len+hdrlen);
1449 compressed = xmalloc(size);
1450
1451 /* Compress it */
1452 stream.next_out = compressed;
1453 stream.avail_out = size;
1454
1455 /* First header.. */
1456 stream.next_in = hdr;
1457 stream.avail_in = hdrlen;
1458 while (deflate(&stream, 0) == Z_OK)
1459 /* nothing */;
1460
1461 /* Then the data itself.. */
1462 stream.next_in = buf;
1463 stream.avail_in = len;
1464 while (deflate(&stream, Z_FINISH) == Z_OK)
1465 /* nothing */;
1466 deflateEnd(&stream);
1467 size = stream.total_out;
1468
1469 if (write(fd, compressed, size) != size)
1470 die("unable to write file");
1471 fchmod(fd, 0444);
1472 close(fd);
1473 free(compressed);
1474
1475 return move_temp_to_file(tmpfile, filename);
1476 }
1477
1478 int write_sha1_to_fd(int fd, const unsigned char *sha1)
1479 {
1480 ssize_t size;
1481 unsigned long objsize;
1482 int posn = 0;
1483 void *map = map_sha1_file_internal(sha1, &objsize);
1484 void *buf = map;
1485 void *temp_obj = NULL;
1486 z_stream stream;
1487
1488 if (!buf) {
1489 unsigned char *unpacked;
1490 unsigned long len;
1491 char type[20];
1492 char hdr[50];
1493 int hdrlen;
1494 // need to unpack and recompress it by itself
1495 unpacked = read_packed_sha1(sha1, type, &len);
1496
1497 hdrlen = sprintf(hdr, "%s %lu", type, len) + 1;
1498
1499 /* Set it up */
1500 memset(&stream, 0, sizeof(stream));
1501 deflateInit(&stream, Z_BEST_COMPRESSION);
1502 size = deflateBound(&stream, len + hdrlen);
1503 temp_obj = buf = xmalloc(size);
1504
1505 /* Compress it */
1506 stream.next_out = buf;
1507 stream.avail_out = size;
1508
1509 /* First header.. */
1510 stream.next_in = (void *)hdr;
1511 stream.avail_in = hdrlen;
1512 while (deflate(&stream, 0) == Z_OK)
1513 /* nothing */;
1514
1515 /* Then the data itself.. */
1516 stream.next_in = unpacked;
1517 stream.avail_in = len;
1518 while (deflate(&stream, Z_FINISH) == Z_OK)
1519 /* nothing */;
1520 deflateEnd(&stream);
1521 free(unpacked);
1522
1523 objsize = stream.total_out;
1524 }
1525
1526 do {
1527 size = write(fd, buf + posn, objsize - posn);
1528 if (size <= 0) {
1529 if (!size) {
1530 fprintf(stderr, "write closed\n");
1531 } else {
1532 perror("write ");
1533 }
1534 return -1;
1535 }
1536 posn += size;
1537 } while (posn < objsize);
1538
1539 if (map)
1540 munmap(map, objsize);
1541 if (temp_obj)
1542 free(temp_obj);
1543
1544 return 0;
1545 }
1546
1547 int write_sha1_from_fd(const unsigned char *sha1, int fd, char *buffer,
1548 size_t bufsize, size_t *bufposn)
1549 {
1550 char tmpfile[PATH_MAX];
1551 int local;
1552 z_stream stream;
1553 unsigned char real_sha1[20];
1554 unsigned char discard[4096];
1555 int ret;
1556 SHA_CTX c;
1557
1558 snprintf(tmpfile, sizeof(tmpfile), "%s/obj_XXXXXX", get_object_directory());
1559
1560 local = mkstemp(tmpfile);
1561 if (local < 0)
1562 return error("Couldn't open %s for %s",
1563 tmpfile, sha1_to_hex(sha1));
1564
1565 memset(&stream, 0, sizeof(stream));
1566
1567 inflateInit(&stream);
1568
1569 SHA1_Init(&c);
1570
1571 do {
1572 ssize_t size;
1573 if (*bufposn) {
1574 stream.avail_in = *bufposn;
1575 stream.next_in = (unsigned char *) buffer;
1576 do {
1577 stream.next_out = discard;
1578 stream.avail_out = sizeof(discard);
1579 ret = inflate(&stream, Z_SYNC_FLUSH);
1580 SHA1_Update(&c, discard, sizeof(discard) -
1581 stream.avail_out);
1582 } while (stream.avail_in && ret == Z_OK);
1583 write(local, buffer, *bufposn - stream.avail_in);
1584 memmove(buffer, buffer + *bufposn - stream.avail_in,
1585 stream.avail_in);
1586 *bufposn = stream.avail_in;
1587 if (ret != Z_OK)
1588 break;
1589 }
1590 size = read(fd, buffer + *bufposn, bufsize - *bufposn);
1591 if (size <= 0) {
1592 close(local);
1593 unlink(tmpfile);
1594 if (!size)
1595 return error("Connection closed?");
1596 perror("Reading from connection");
1597 return -1;
1598 }
1599 *bufposn += size;
1600 } while (1);
1601 inflateEnd(&stream);
1602
1603 close(local);
1604 SHA1_Final(real_sha1, &c);
1605 if (ret != Z_STREAM_END) {
1606 unlink(tmpfile);
1607 return error("File %s corrupted", sha1_to_hex(sha1));
1608 }
1609 if (memcmp(sha1, real_sha1, 20)) {
1610 unlink(tmpfile);
1611 return error("File %s has bad hash", sha1_to_hex(sha1));
1612 }
1613
1614 return move_temp_to_file(tmpfile, sha1_file_name(sha1));
1615 }
1616
1617 int has_pack_index(const unsigned char *sha1)
1618 {
1619 struct stat st;
1620 if (stat(sha1_pack_index_name(sha1), &st))
1621 return 0;
1622 return 1;
1623 }
1624
1625 int has_pack_file(const unsigned char *sha1)
1626 {
1627 struct stat st;
1628 if (stat(sha1_pack_name(sha1), &st))
1629 return 0;
1630 return 1;
1631 }
1632
1633 int has_sha1_pack(const unsigned char *sha1)
1634 {
1635 struct pack_entry e;
1636 return find_pack_entry(sha1, &e);
1637 }
1638
1639 int has_sha1_file(const unsigned char *sha1)
1640 {
1641 struct stat st;
1642 struct pack_entry e;
1643
1644 if (find_pack_entry(sha1, &e))
1645 return 1;
1646 return find_sha1_file(sha1, &st) ? 1 : 0;
1647 }
1648
1649 int index_pipe(unsigned char *sha1, int fd, const char *type, int write_object)
1650 {
1651 unsigned long size = 4096;
1652 char *buf = malloc(size);
1653 int iret, ret;
1654 unsigned long off = 0;
1655 unsigned char hdr[50];
1656 int hdrlen;
1657 do {
1658 iret = read(fd, buf + off, size - off);
1659 if (iret > 0) {
1660 off += iret;
1661 if (off == size) {
1662 size *= 2;
1663 buf = realloc(buf, size);
1664 }
1665 }
1666 } while (iret > 0);
1667 if (iret < 0) {
1668 free(buf);
1669 return -1;
1670 }
1671 if (!type)
1672 type = blob_type;
1673 if (write_object)
1674 ret = write_sha1_file(buf, off, type, sha1);
1675 else {
1676 write_sha1_file_prepare(buf, off, type, sha1, hdr, &hdrlen);
1677 ret = 0;
1678 }
1679 free(buf);
1680 return ret;
1681 }
1682
1683 int index_fd(unsigned char *sha1, int fd, struct stat *st, int write_object, const char *type)
1684 {
1685 unsigned long size = st->st_size;
1686 void *buf;
1687 int ret;
1688 unsigned char hdr[50];
1689 int hdrlen;
1690
1691 buf = "";
1692 if (size)
1693 buf = mmap(NULL, size, PROT_READ, MAP_PRIVATE, fd, 0);
1694 close(fd);
1695 if (buf == MAP_FAILED)
1696 return -1;
1697
1698 if (!type)
1699 type = blob_type;
1700 if (write_object)
1701 ret = write_sha1_file(buf, size, type, sha1);
1702 else {
1703 write_sha1_file_prepare(buf, size, type, sha1, hdr, &hdrlen);
1704 ret = 0;
1705 }
1706 if (size)
1707 munmap(buf, size);
1708 return ret;
1709 }
1710
1711 int index_path(unsigned char *sha1, const char *path, struct stat *st, int write_object)
1712 {
1713 int fd;
1714 char *target;
1715
1716 switch (st->st_mode & S_IFMT) {
1717 case S_IFREG:
1718 fd = open(path, O_RDONLY);
1719 if (fd < 0)
1720 return error("open(\"%s\"): %s", path,
1721 strerror(errno));
1722 if (index_fd(sha1, fd, st, write_object, NULL) < 0)
1723 return error("%s: failed to insert into database",
1724 path);
1725 break;
1726 case S_IFLNK:
1727 target = xmalloc(st->st_size+1);
1728 if (readlink(path, target, st->st_size+1) != st->st_size) {
1729 char *errstr = strerror(errno);
1730 free(target);
1731 return error("readlink(\"%s\"): %s", path,
1732 errstr);
1733 }
1734 if (!write_object) {
1735 unsigned char hdr[50];
1736 int hdrlen;
1737 write_sha1_file_prepare(target, st->st_size, blob_type,
1738 sha1, hdr, &hdrlen);
1739 } else if (write_sha1_file(target, st->st_size, blob_type, sha1))
1740 return error("%s: failed to insert into database",
1741 path);
1742 free(target);
1743 break;
1744 default:
1745 return error("%s: unsupported file type", path);
1746 }
1747 return 0;
1748 }