-u is now default for 'git-mailinfo'.
[git/git.git] / sha1_file.c
CommitLineData
0fcfd160
LT
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 */
0fcfd160 9#include "cache.h"
1f688557 10#include "delta.h"
a733cb60 11#include "pack.h"
8e440259
PE
12#include "blob.h"
13#include "commit.h"
14#include "tag.h"
15#include "tree.h"
0fcfd160 16
144bde78
LT
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
96f1e58f 25const unsigned char null_sha1[20];
88cd621d 26
144bde78
LT
27static unsigned int sha1_file_open_flag = O_NOATIME;
28
e49521b5
JH
29signed char hexval_table[256] = {
30 -1, -1, -1, -1, -1, -1, -1, -1, /* 00-07 */
31 -1, -1, -1, -1, -1, -1, -1, -1, /* 08-0f */
32 -1, -1, -1, -1, -1, -1, -1, -1, /* 10-17 */
33 -1, -1, -1, -1, -1, -1, -1, -1, /* 18-1f */
34 -1, -1, -1, -1, -1, -1, -1, -1, /* 20-27 */
35 -1, -1, -1, -1, -1, -1, -1, -1, /* 28-2f */
36 0, 1, 2, 3, 4, 5, 6, 7, /* 30-37 */
37 8, 9, -1, -1, -1, -1, -1, -1, /* 38-3f */
38 -1, 10, 11, 12, 13, 14, 15, -1, /* 40-47 */
39 -1, -1, -1, -1, -1, -1, -1, -1, /* 48-4f */
40 -1, -1, -1, -1, -1, -1, -1, -1, /* 50-57 */
41 -1, -1, -1, -1, -1, -1, -1, -1, /* 58-5f */
42 -1, 10, 11, 12, 13, 14, 15, -1, /* 60-67 */
43 -1, -1, -1, -1, -1, -1, -1, -1, /* 68-67 */
44 -1, -1, -1, -1, -1, -1, -1, -1, /* 70-77 */
45 -1, -1, -1, -1, -1, -1, -1, -1, /* 78-7f */
46 -1, -1, -1, -1, -1, -1, -1, -1, /* 80-87 */
47 -1, -1, -1, -1, -1, -1, -1, -1, /* 88-8f */
48 -1, -1, -1, -1, -1, -1, -1, -1, /* 90-97 */
49 -1, -1, -1, -1, -1, -1, -1, -1, /* 98-9f */
50 -1, -1, -1, -1, -1, -1, -1, -1, /* a0-a7 */
51 -1, -1, -1, -1, -1, -1, -1, -1, /* a8-af */
52 -1, -1, -1, -1, -1, -1, -1, -1, /* b0-b7 */
53 -1, -1, -1, -1, -1, -1, -1, -1, /* b8-bf */
54 -1, -1, -1, -1, -1, -1, -1, -1, /* c0-c7 */
55 -1, -1, -1, -1, -1, -1, -1, -1, /* c8-cf */
56 -1, -1, -1, -1, -1, -1, -1, -1, /* d0-d7 */
57 -1, -1, -1, -1, -1, -1, -1, -1, /* d8-df */
58 -1, -1, -1, -1, -1, -1, -1, -1, /* e0-e7 */
59 -1, -1, -1, -1, -1, -1, -1, -1, /* e8-ef */
60 -1, -1, -1, -1, -1, -1, -1, -1, /* f0-f7 */
61 -1, -1, -1, -1, -1, -1, -1, -1, /* f8-ff */
62};
0fcfd160
LT
63
64int get_sha1_hex(const char *hex, unsigned char *sha1)
65{
66 int i;
67 for (i = 0; i < 20; i++) {
68 unsigned int val = (hexval(hex[0]) << 4) | hexval(hex[1]);
69 if (val & ~0xff)
70 return -1;
71 *sha1++ = val;
72 hex += 2;
73 }
74 return 0;
75}
76
b2cb9425
JH
77int safe_create_leading_directories(char *path)
78{
79 char *pos = path;
67d42212
JR
80 struct stat st;
81
67ffdf4c
JS
82 if (*pos == '/')
83 pos++;
b2cb9425
JH
84
85 while (pos) {
86 pos = strchr(pos, '/');
87 if (!pos)
88 break;
89 *pos = 0;
67d42212
JR
90 if (!stat(path, &st)) {
91 /* path exists */
92 if (!S_ISDIR(st.st_mode)) {
b2cb9425 93 *pos = '/';
67d42212 94 return -3;
b2cb9425 95 }
457f06d6 96 }
67d42212
JR
97 else if (mkdir(path, 0777)) {
98 *pos = '/';
99 return -1;
100 }
457f06d6
JS
101 else if (adjust_shared_perm(path)) {
102 *pos = '/';
103 return -2;
104 }
b2cb9425
JH
105 *pos++ = '/';
106 }
107 return 0;
108}
723c31fe 109
0fcfd160
LT
110char * sha1_to_hex(const unsigned char *sha1)
111{
dcb3450f
LT
112 static int bufno;
113 static char hexbuffer[4][50];
0fcfd160 114 static const char hex[] = "0123456789abcdef";
dcb3450f 115 char *buffer = hexbuffer[3 & ++bufno], *buf = buffer;
0fcfd160
LT
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 }
1e80e044
JS
123 *buf = '\0';
124
0fcfd160
LT
125 return buffer;
126}
127
ace1534d
JH
128static 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
0fcfd160
LT
140/*
141 * NOTE! This returns a statically allocated buffer, so you have to be
9befac47 142 * careful about using it. Do a "xstrdup()" if you need to save the
0fcfd160 143 * filename.
ace1534d
JH
144 *
145 * Also note that this returns the location for creating. Reading
146 * SHA1 file can happen from any alternate directory listed in the
d19938ab 147 * DB_ENVIRONMENT environment variable if it is not found in
ace1534d 148 * the primary object database.
0fcfd160
LT
149 */
150char *sha1_file_name(const unsigned char *sha1)
151{
0fcfd160
LT
152 static char *name, *base;
153
154 if (!base) {
d19938ab 155 const char *sha1_file_directory = get_object_directory();
0fcfd160 156 int len = strlen(sha1_file_directory);
812666c8 157 base = xmalloc(len + 60);
0fcfd160
LT
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 }
ace1534d 164 fill_sha1_path(name, sha1);
0fcfd160
LT
165 return base;
166}
167
bf592c50
DB
168char *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
193char *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
d5a63b99
JH
218struct alternate_object_database *alt_odb_list;
219static struct alternate_object_database **alt_odb_tail;
ace1534d 220
c2f493a4
MW
221static void read_info_alternates(const char * alternates, int depth);
222
ddd5d056
JH
223/*
224 * Prepare alternate object database registry.
d5a63b99
JH
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,
1494e038
JH
230 * whose contents is similar to that environment variable but can be
231 * LF separated. Its base points at a statically allocated buffer that
d5a63b99
JH
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.
ddd5d056 237 */
c2f493a4 238static int link_alt_odb_entry(const char * entry, int len, const char * relative_base, int depth)
ace1534d 239{
c2f493a4 240 struct stat st;
1494e038 241 const char *objdir = get_object_directory();
c2f493a4
MW
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;
ccfd3e99 247 int base_len = -1;
d5a63b99 248
c2f493a4
MW
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
306static 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
d5a63b99 317 last = alt;
9577e7e3
JH
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 }
c2f493a4
MW
326 while (cp < ep && *cp != sep)
327 cp++;
d5a63b99 328 if (last != cp) {
c2f493a4
MW
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);
1494e038 335 }
d5a63b99 336 }
9577e7e3 337 while (cp < ep && *cp == sep)
d5a63b99
JH
338 cp++;
339 last = cp;
9577e7e3 340 }
d5a63b99
JH
341}
342
c2f493a4 343static void read_info_alternates(const char * relative_base, int depth)
d5a63b99 344{
9577e7e3 345 char *map;
d5a63b99 346 struct stat st;
c2f493a4
MW
347 char path[PATH_MAX];
348 int fd;
d5a63b99 349
c2f493a4 350 sprintf(path, "%s/info/alternates", relative_base);
d5a63b99
JH
351 fd = open(path, O_RDONLY);
352 if (fd < 0)
353 return;
354 if (fstat(fd, &st) || (st.st_size == 0)) {
355 close(fd);
9a217f2a 356 return;
ace1534d 357 }
c4712e45 358 map = xmmap(NULL, st.st_size, PROT_READ, MAP_PRIVATE, fd, 0);
d5a63b99 359 close(fd);
d5a63b99 360
c2f493a4
MW
361 link_alt_odb_entries(map, map + st.st_size, '\n', relative_base, depth);
362
d5a63b99 363 munmap(map, st.st_size);
ace1534d
JH
364}
365
c2f493a4
MW
366void prepare_alt_odb(void)
367{
554fe20d 368 const char *alt;
c2f493a4
MW
369
370 alt = getenv(ALTERNATE_DB_ENVIRONMENT);
371 if (!alt) alt = "";
372
373 if (alt_odb_tail)
374 return;
375 alt_odb_tail = &alt_odb_list;
376 link_alt_odb_entries(alt, alt + strlen(alt), ':', NULL, 0);
377
378 read_info_alternates(get_object_directory(), 0);
379}
380
ace1534d
JH
381static char *find_sha1_file(const unsigned char *sha1, struct stat *st)
382{
ace1534d 383 char *name = sha1_file_name(sha1);
d5a63b99 384 struct alternate_object_database *alt;
ace1534d
JH
385
386 if (!stat(name, st))
387 return name;
9a217f2a 388 prepare_alt_odb();
d5a63b99
JH
389 for (alt = alt_odb_list; alt; alt = alt->next) {
390 name = alt->name;
ace1534d 391 fill_sha1_path(name, sha1);
d5a63b99
JH
392 if (!stat(alt->base, st))
393 return alt->base;
ace1534d
JH
394 }
395 return NULL;
396}
397
60bb8b14 398static unsigned int pack_used_ctr;
a53128b6
SP
399static unsigned int pack_mmap_calls;
400static unsigned int peak_pack_open_windows;
401static unsigned int pack_open_windows;
402static size_t peak_pack_mapped;
60bb8b14
SP
403static size_t pack_mapped;
404static size_t page_size;
9a217f2a 405struct packed_git *packed_git;
1f688557 406
a53128b6
SP
407void pack_report()
408{
409 fprintf(stderr,
410 "pack_report: getpagesize() = %10lu\n"
411 "pack_report: core.packedGitWindowSize = %10lu\n"
412 "pack_report: core.packedGitLimit = %10lu\n",
413 page_size,
414 packed_git_window_size,
415 packed_git_limit);
416 fprintf(stderr,
417 "pack_report: pack_used_ctr = %10u\n"
418 "pack_report: pack_mmap_calls = %10u\n"
419 "pack_report: pack_open_windows = %10u / %10u\n"
420 "pack_report: pack_mapped = %10lu / %10lu\n",
421 pack_used_ctr,
422 pack_mmap_calls,
423 pack_open_windows, peak_pack_open_windows,
424 pack_mapped, peak_pack_mapped);
425}
426
1f688557
JH
427static int check_packed_git_idx(const char *path, unsigned long *idx_size_,
428 void **idx_map_)
429{
430 void *idx_map;
431 unsigned int *index;
432 unsigned long idx_size;
433 int nr, i;
e93ec6f9 434 int fd = open(path, O_RDONLY);
1f688557
JH
435 struct stat st;
436 if (fd < 0)
437 return -1;
438 if (fstat(fd, &st)) {
439 close(fd);
440 return -1;
441 }
442 idx_size = st.st_size;
c4712e45 443 idx_map = xmmap(NULL, idx_size, PROT_READ, MAP_PRIVATE, fd, 0);
1f688557 444 close(fd);
1f688557
JH
445
446 index = idx_map;
4d235c80
LT
447 *idx_map_ = idx_map;
448 *idx_size_ = idx_size;
1f688557
JH
449
450 /* check index map */
f9253394 451 if (idx_size < 4*256 + 20 + 20)
1f688557
JH
452 return error("index file too small");
453 nr = 0;
454 for (i = 0; i < 256; i++) {
455 unsigned int n = ntohl(index[i]);
456 if (n < nr)
457 return error("non-monotonic index");
458 nr = n;
459 }
460
461 /*
462 * Total size:
463 * - 256 index entries 4 bytes each
464 * - 24-byte entries * nr (20-byte sha1 + 4-byte offset)
465 * - 20-byte SHA1 of the packfile
466 * - 20-byte SHA1 file checksum
467 */
468 if (idx_size != 4*256 + nr * 24 + 20 + 20)
469 return error("wrong index file size");
470
1f688557
JH
471 return 0;
472}
473
11daf39b
SP
474static void scan_windows(struct packed_git *p,
475 struct packed_git **lru_p,
476 struct pack_window **lru_w,
477 struct pack_window **lru_l)
1f688557 478{
11daf39b
SP
479 struct pack_window *w, *w_l;
480
481 for (w_l = NULL, w = p->windows; w; w = w->next) {
482 if (!w->inuse_cnt) {
483 if (!*lru_w || w->last_used < (*lru_w)->last_used) {
484 *lru_p = p;
485 *lru_w = w;
486 *lru_l = w_l;
54044bf8 487 }
54044bf8 488 }
11daf39b 489 w_l = w;
f9253394 490 }
11daf39b
SP
491}
492
493static int unuse_one_window(struct packed_git *current)
494{
495 struct packed_git *p, *lru_p = NULL;
496 struct pack_window *lru_w = NULL, *lru_l = NULL;
497
498 if (current)
499 scan_windows(current, &lru_p, &lru_w, &lru_l);
500 for (p = packed_git; p; p = p->next)
501 scan_windows(p, &lru_p, &lru_w, &lru_l);
54044bf8
SP
502 if (lru_p) {
503 munmap(lru_w->base, lru_w->len);
504 pack_mapped -= lru_w->len;
505 if (lru_l)
506 lru_l->next = lru_w->next;
507 else {
508 lru_p->windows = lru_w->next;
11daf39b 509 if (!lru_p->windows && lru_p != current) {
54044bf8
SP
510 close(lru_p->pack_fd);
511 lru_p->pack_fd = -1;
512 }
513 }
514 free(lru_w);
a53128b6 515 pack_open_windows--;
54044bf8
SP
516 return 1;
517 }
518 return 0;
f9253394
JH
519}
520
97bfeb34
SP
521void release_pack_memory(size_t need)
522{
523 size_t cur = pack_mapped;
524 while (need >= (cur - pack_mapped) && unuse_one_window(NULL))
525 ; /* nothing */
526}
527
03e79c88 528void unuse_pack(struct pack_window **w_cursor)
f9253394 529{
03e79c88
SP
530 struct pack_window *w = *w_cursor;
531 if (w) {
532 w->inuse_cnt--;
533 *w_cursor = NULL;
534 }
1f688557
JH
535}
536
9bc879c1 537static void open_packed_git(struct packed_git *p)
1f688557 538{
9bc879c1
SP
539 struct stat st;
540 struct pack_header hdr;
541 unsigned char sha1[20];
542 unsigned char *idx_sha1;
2c039da8 543 long fd_flag;
9bc879c1
SP
544
545 p->pack_fd = open(p->pack_name, O_RDONLY);
546 if (p->pack_fd < 0 || fstat(p->pack_fd, &st))
547 die("packfile %s cannot be opened", p->pack_name);
548
549 /* If we created the struct before we had the pack we lack size. */
bf592c50 550 if (!p->pack_size) {
bf592c50
DB
551 if (!S_ISREG(st.st_mode))
552 die("packfile %s not a regular file", p->pack_name);
553 p->pack_size = st.st_size;
9bc879c1
SP
554 } else if (p->pack_size != st.st_size)
555 die("packfile %s size changed", p->pack_name);
556
2c039da8
JH
557 /* We leave these file descriptors open with sliding mmap;
558 * there is no point keeping them open across exec(), though.
559 */
560 fd_flag = fcntl(p->pack_fd, F_GETFD, 0);
561 if (fd_flag < 0)
562 die("cannot determine file descriptor flags");
563 fd_flag |= FD_CLOEXEC;
564 if (fcntl(p->pack_fd, F_SETFD, fd_flag) == -1)
565 die("cannot set FD_CLOEXEC");
566
9bc879c1
SP
567 /* Verify we recognize this pack file format. */
568 read_or_die(p->pack_fd, &hdr, sizeof(hdr));
569 if (hdr.hdr_signature != htonl(PACK_SIGNATURE))
570 die("file %s is not a GIT packfile", p->pack_name);
571 if (!pack_version_ok(hdr.hdr_version))
572 die("packfile %s is version %u and not supported"
573 " (try upgrading GIT to a newer version)",
574 p->pack_name, ntohl(hdr.hdr_version));
575
576 /* Verify the pack matches its index. */
577 if (num_packed_objects(p) != ntohl(hdr.hdr_entries))
578 die("packfile %s claims to have %u objects"
579 " while index size indicates %u objects",
580 p->pack_name, ntohl(hdr.hdr_entries),
581 num_packed_objects(p));
582 if (lseek(p->pack_fd, p->pack_size - sizeof(sha1), SEEK_SET) == -1)
583 die("end of packfile %s is unavailable", p->pack_name);
584 read_or_die(p->pack_fd, sha1, sizeof(sha1));
585 idx_sha1 = ((unsigned char *)p->index_base) + p->index_size - 40;
586 if (hashcmp(sha1, idx_sha1))
587 die("packfile %s does not match index", p->pack_name);
588}
589
60bb8b14
SP
590static int in_window(struct pack_window *win, unsigned long offset)
591{
592 /* We must promise at least 20 bytes (one hash) after the
593 * offset is available from this window, otherwise the offset
594 * is not actually in this window and a different window (which
595 * has that one hash excess) must be used. This is to support
596 * the object header and delta base parsing routines below.
597 */
598 off_t win_off = win->offset;
599 return win_off <= offset
600 && (offset + 20) <= (win_off + win->len);
601}
602
03e79c88
SP
603unsigned char* use_pack(struct packed_git *p,
604 struct pack_window **w_cursor,
605 unsigned long offset,
606 unsigned int *left)
9bc879c1 607{
60bb8b14 608 struct pack_window *win = *w_cursor;
03e79c88 609
9bc879c1
SP
610 if (p->pack_fd == -1)
611 open_packed_git(p);
60bb8b14
SP
612
613 /* Since packfiles end in a hash of their content and its
614 * pointless to ask for an offset into the middle of that
615 * hash, and the in_window function above wouldn't match
616 * don't allow an offset too close to the end of the file.
617 */
618 if (offset > (p->pack_size - 20))
619 die("offset beyond end of packfile (truncated pack?)");
620
621 if (!win || !in_window(win, offset)) {
622 if (win)
623 win->inuse_cnt--;
624 for (win = p->windows; win; win = win->next) {
625 if (in_window(win, offset))
626 break;
627 }
628 if (!win) {
629 if (!page_size)
630 page_size = getpagesize();
631 win = xcalloc(1, sizeof(*win));
632 win->offset = (offset / page_size) * page_size;
633 win->len = p->pack_size - win->offset;
634 if (win->len > packed_git_window_size)
635 win->len = packed_git_window_size;
636 pack_mapped += win->len;
11daf39b
SP
637 while (packed_git_limit < pack_mapped
638 && unuse_one_window(p))
60bb8b14 639 ; /* nothing */
c4712e45 640 win->base = xmmap(NULL, win->len,
60bb8b14
SP
641 PROT_READ, MAP_PRIVATE,
642 p->pack_fd, win->offset);
643 if (win->base == MAP_FAILED)
73b4e4be
SP
644 die("packfile %s cannot be mapped: %s",
645 p->pack_name,
646 strerror(errno));
a53128b6
SP
647 pack_mmap_calls++;
648 pack_open_windows++;
649 if (pack_mapped > peak_pack_mapped)
650 peak_pack_mapped = pack_mapped;
651 if (pack_open_windows > peak_pack_open_windows)
652 peak_pack_open_windows = pack_open_windows;
60bb8b14
SP
653 win->next = p->windows;
654 p->windows = win;
655 }
1f688557 656 }
03e79c88
SP
657 if (win != *w_cursor) {
658 win->last_used = pack_used_ctr++;
659 win->inuse_cnt++;
660 *w_cursor = win;
661 }
60bb8b14 662 offset -= win->offset;
03e79c88
SP
663 if (left)
664 *left = win->len - offset;
665 return win->base + offset;
1f688557
JH
666}
667
9d835df2 668struct packed_git *add_packed_git(char *path, int path_len, int local)
1f688557
JH
669{
670 struct stat st;
671 struct packed_git *p;
672 unsigned long idx_size;
673 void *idx_map;
c0bbbb1b 674 unsigned char sha1[20];
1f688557
JH
675
676 if (check_packed_git_idx(path, &idx_size, &idx_map))
677 return NULL;
678
679 /* do we have a corresponding .pack file? */
680 strcpy(path + path_len - 4, ".pack");
681 if (stat(path, &st) || !S_ISREG(st.st_mode)) {
682 munmap(idx_map, idx_size);
683 return NULL;
684 }
685 /* ok, it looks sane as far as we can check without
686 * actually mapping the pack file.
687 */
688 p = xmalloc(sizeof(*p) + path_len + 2);
689 strcpy(p->pack_name, path);
690 p->index_size = idx_size;
691 p->pack_size = st.st_size;
692 p->index_base = idx_map;
693 p->next = NULL;
c41ee586 694 p->windows = NULL;
9bc879c1 695 p->pack_fd = -1;
9d835df2 696 p->pack_local = local;
f4a11066 697 if ((path_len > 44) && !get_sha1_hex(path + path_len - 44, sha1))
e702496e 698 hashcpy(p->sha1, sha1);
1f688557
JH
699 return p;
700}
701
bf592c50 702struct packed_git *parse_pack_index(unsigned char *sha1)
c508df5e
DB
703{
704 char *path = sha1_pack_index_name(sha1);
705 return parse_pack_index_file(sha1, path);
706}
707
2ab141a2 708struct packed_git *parse_pack_index_file(const unsigned char *sha1, char *idx_path)
bf592c50
DB
709{
710 struct packed_git *p;
711 unsigned long idx_size;
712 void *idx_map;
c508df5e 713 char *path;
bf592c50 714
c508df5e 715 if (check_packed_git_idx(idx_path, &idx_size, &idx_map))
bf592c50
DB
716 return NULL;
717
718 path = sha1_pack_name(sha1);
719
720 p = xmalloc(sizeof(*p) + strlen(path) + 2);
721 strcpy(p->pack_name, path);
722 p->index_size = idx_size;
723 p->pack_size = 0;
724 p->index_base = idx_map;
725 p->next = NULL;
c41ee586 726 p->windows = NULL;
9bc879c1 727 p->pack_fd = -1;
e702496e 728 hashcpy(p->sha1, sha1);
bf592c50
DB
729 return p;
730}
731
732void install_packed_git(struct packed_git *pack)
733{
734 pack->next = packed_git;
735 packed_git = pack;
736}
737
9d835df2 738static void prepare_packed_git_one(char *objdir, int local)
1f688557
JH
739{
740 char path[PATH_MAX];
741 int len;
742 DIR *dir;
743 struct dirent *de;
744
745 sprintf(path, "%s/pack", objdir);
746 len = strlen(path);
747 dir = opendir(path);
b5b16990 748 if (!dir) {
26125f6b 749 if (errno != ENOENT)
bd2afde8 750 error("unable to open object pack directory: %s: %s",
26125f6b 751 path, strerror(errno));
1f688557 752 return;
b5b16990 753 }
1f688557
JH
754 path[len++] = '/';
755 while ((de = readdir(dir)) != NULL) {
756 int namelen = strlen(de->d_name);
757 struct packed_git *p;
758
5bb1cda5 759 if (!has_extension(de->d_name, ".idx"))
1f688557
JH
760 continue;
761
762 /* we have .idx. Is it a file we can map? */
763 strcpy(path + len, de->d_name);
86f7780c
JK
764 for (p = packed_git; p; p = p->next) {
765 if (!memcmp(path, p->pack_name, len + namelen - 4))
766 break;
767 }
768 if (p)
769 continue;
9d835df2 770 p = add_packed_git(path, len + namelen, local);
1f688557
JH
771 if (!p)
772 continue;
773 p->next = packed_git;
774 packed_git = p;
775 }
5b35bcd5 776 closedir(dir);
1f688557
JH
777}
778
637cdd9d 779static int prepare_packed_git_run_once = 0;
9a217f2a 780void prepare_packed_git(void)
1f688557 781{
d5a63b99 782 struct alternate_object_database *alt;
1f688557 783
637cdd9d 784 if (prepare_packed_git_run_once)
1f688557 785 return;
9d835df2 786 prepare_packed_git_one(get_object_directory(), 1);
9a217f2a 787 prepare_alt_odb();
d5a63b99 788 for (alt = alt_odb_list; alt; alt = alt->next) {
1494e038 789 alt->name[-1] = 0;
9d835df2 790 prepare_packed_git_one(alt->base, 0);
1494e038 791 alt->name[-1] = '/';
1f688557 792 }
637cdd9d
JK
793 prepare_packed_git_run_once = 1;
794}
795
fc04c412 796void reprepare_packed_git(void)
637cdd9d
JK
797{
798 prepare_packed_git_run_once = 0;
799 prepare_packed_git();
1f688557
JH
800}
801
5d6ccf5c 802int check_sha1_signature(const unsigned char *sha1, void *map, unsigned long size, const char *type)
0fcfd160
LT
803{
804 unsigned char real_sha1[20];
7cfb5f36 805 hash_sha1_file(map, size, type, real_sha1);
a89fccd2 806 return hashcmp(sha1, real_sha1) ? -1 : 0;
0fcfd160
LT
807}
808
bb6b8e4f 809void *map_sha1_file(const unsigned char *sha1, unsigned long *size)
0fcfd160 810{
0fcfd160
LT
811 struct stat st;
812 void *map;
144bde78 813 int fd;
ace1534d
JH
814 char *filename = find_sha1_file(sha1, &st);
815
816 if (!filename) {
ace1534d
JH
817 return NULL;
818 }
0fcfd160 819
144bde78 820 fd = open(filename, O_RDONLY | sha1_file_open_flag);
0fcfd160 821 if (fd < 0) {
144bde78
LT
822 /* See if it works without O_NOATIME */
823 switch (sha1_file_open_flag) {
824 default:
825 fd = open(filename, O_RDONLY);
826 if (fd >= 0)
827 break;
828 /* Fallthrough */
829 case 0:
144bde78
LT
830 return NULL;
831 }
832
1f688557
JH
833 /* If it failed once, it will probably fail again.
834 * Stop using O_NOATIME
835 */
144bde78 836 sha1_file_open_flag = 0;
0fcfd160 837 }
c4712e45 838 map = xmmap(NULL, st.st_size, PROT_READ, MAP_PRIVATE, fd, 0);
0fcfd160 839 close(fd);
0fcfd160
LT
840 *size = st.st_size;
841 return map;
842}
843
bb6b8e4f
JH
844int legacy_loose_object(unsigned char *map)
845{
846 unsigned int word;
847
848 /*
849 * Is it a zlib-compressed buffer? If so, the first byte
850 * must be 0x78 (15-bit window size, deflated), and the
851 * first 16-bit word is evenly divisible by 31
852 */
853 word = (map[0] << 8) + map[1];
854 if (map[0] == 0x78 && !(word % 31))
855 return 1;
856 else
857 return 0;
858}
859
72518e9c 860unsigned long unpack_object_header_gently(const unsigned char *buf, unsigned long len, enum object_type *type, unsigned long *sizep)
c4483576 861{
ad1ed5ee 862 unsigned shift;
93821bd9 863 unsigned char c;
93821bd9 864 unsigned long size;
ad1ed5ee
JH
865 unsigned long used = 0;
866
867 c = buf[used++];
868 *type = (c >> 4) & 7;
869 size = c & 15;
870 shift = 4;
871 while (c & 0x80) {
872 if (len <= used)
873 return 0;
874 if (sizeof(long) * 8 <= shift)
875 return 0;
876 c = buf[used++];
877 size += (c & 0x7f) << shift;
878 shift += 7;
879 }
880 *sizep = size;
881 return used;
882}
883
884static int unpack_sha1_header(z_stream *stream, unsigned char *map, unsigned long mapsize, void *buffer, unsigned long bufsiz)
885{
886 unsigned long size, used;
887 static const char valid_loose_object_type[8] = {
888 0, /* OBJ_EXT */
889 1, 1, 1, 1, /* "commit", "tree", "blob", "tag" */
890 0, /* "delta" and others are invalid in a loose object */
93821bd9 891 };
ad1ed5ee 892 enum object_type type;
93821bd9 893
c4483576
LT
894 /* Get the data stream */
895 memset(stream, 0, sizeof(*stream));
896 stream->next_in = map;
897 stream->avail_in = mapsize;
898 stream->next_out = buffer;
93821bd9
LT
899 stream->avail_out = bufsiz;
900
bb6b8e4f 901 if (legacy_loose_object(map)) {
93821bd9
LT
902 inflateInit(stream);
903 return inflate(stream, 0);
904 }
905
ad1ed5ee
JH
906 used = unpack_object_header_gently(map, mapsize, &type, &size);
907 if (!used || !valid_loose_object_type[type])
93821bd9 908 return -1;
ad1ed5ee
JH
909 map += used;
910 mapsize -= used;
93821bd9
LT
911
912 /* Set up the stream for the rest.. */
913 stream->next_in = map;
914 stream->avail_in = mapsize;
c4483576 915 inflateInit(stream);
93821bd9
LT
916
917 /* And generate the fake traditional header */
ad1ed5ee
JH
918 stream->total_out = 1 + snprintf(buffer, bufsiz, "%s %lu",
919 type_names[type], size);
93821bd9 920 return 0;
c4483576
LT
921}
922
6da4016a 923static void *unpack_sha1_rest(z_stream *stream, void *buffer, unsigned long size)
5180cacc
LT
924{
925 int bytes = strlen(buffer) + 1;
d565b341 926 unsigned char *buf = xmalloc(1+size);
93821bd9 927 unsigned long n;
5180cacc 928
93821bd9
LT
929 n = stream->total_out - bytes;
930 if (n > size)
931 n = size;
932 memcpy(buf, (char *) buffer + bytes, n);
933 bytes = n;
5180cacc
LT
934 if (bytes < size) {
935 stream->next_out = buf + bytes;
936 stream->avail_out = size - bytes;
937 while (inflate(stream, Z_FINISH) == Z_OK)
938 /* nothing */;
939 }
940 buf[size] = 0;
941 inflateEnd(stream);
942 return buf;
943}
944
945/*
946 * We used to just use "sscanf()", but that's actually way
947 * too permissive for what we want to check. So do an anal
948 * object header parse by hand.
949 */
38d3874d 950static int parse_sha1_header(char *hdr, char *type, unsigned long *sizep)
5180cacc
LT
951{
952 int i;
953 unsigned long size;
954
955 /*
956 * The type can be at most ten bytes (including the
957 * terminating '\0' that we add), and is followed by
958 * a space.
959 */
960 i = 10;
961 for (;;) {
962 char c = *hdr++;
963 if (c == ' ')
964 break;
965 if (!--i)
966 return -1;
967 *type++ = c;
968 }
969 *type = 0;
970
971 /*
972 * The length must follow immediately, and be in canonical
973 * decimal format (ie "010" is not valid).
974 */
975 size = *hdr++ - '0';
976 if (size > 9)
977 return -1;
978 if (size) {
979 for (;;) {
980 unsigned long c = *hdr - '0';
981 if (c > 9)
982 break;
983 hdr++;
984 size = size * 10 + c;
985 }
986 }
987 *sizep = size;
988
989 /*
990 * The length must be followed by a zero byte
991 */
992 return *hdr ? -1 : 0;
993}
994
0fcfd160
LT
995void * unpack_sha1_file(void *map, unsigned long mapsize, char *type, unsigned long *size)
996{
5180cacc 997 int ret;
0fcfd160 998 z_stream stream;
5180cacc 999 char hdr[8192];
0fcfd160 1000
5180cacc
LT
1001 ret = unpack_sha1_header(&stream, map, mapsize, hdr, sizeof(hdr));
1002 if (ret < Z_OK || parse_sha1_header(hdr, type, size) < 0)
0fcfd160
LT
1003 return NULL;
1004
5180cacc 1005 return unpack_sha1_rest(&stream, hdr, *size);
0fcfd160
LT
1006}
1007
eb32d236 1008static unsigned long get_delta_base(struct packed_git *p,
03e79c88 1009 struct pack_window **w_curs,
eb32d236
NP
1010 unsigned long offset,
1011 enum object_type kind,
1012 unsigned long delta_obj_offset,
1013 unsigned long *base_obj_offset)
1014{
03e79c88 1015 unsigned char *base_info = use_pack(p, w_curs, offset, NULL);
eb32d236
NP
1016 unsigned long base_offset;
1017
8d8a4ea5
SP
1018 /* use_pack() assured us we have [base_info, base_info + 20)
1019 * as a range that we can look at without walking off the
1020 * end of the mapped window. Its actually the hash size
1021 * that is assured. An OFS_DELTA longer than the hash size
1022 * is stupid, as then a REF_DELTA would be smaller to store.
1023 */
eb32d236
NP
1024 if (kind == OBJ_OFS_DELTA) {
1025 unsigned used = 0;
1026 unsigned char c = base_info[used++];
1027 base_offset = c & 127;
1028 while (c & 128) {
1029 base_offset += 1;
1030 if (!base_offset || base_offset & ~(~0UL >> 7))
1031 die("offset value overflow for delta base object");
1032 c = base_info[used++];
1033 base_offset = (base_offset << 7) + (c & 127);
1034 }
1035 base_offset = delta_obj_offset - base_offset;
1036 if (base_offset >= delta_obj_offset)
1037 die("delta base offset out of bound");
1038 offset += used;
1039 } else if (kind == OBJ_REF_DELTA) {
1040 /* The base entry _must_ be in the same pack */
1041 base_offset = find_pack_entry_one(base_info, p);
1042 if (!base_offset)
1043 die("failed to find delta-pack base object %s",
1044 sha1_to_hex(base_info));
1045 offset += 20;
1046 } else
1047 die("I am totally screwed");
1048 *base_obj_offset = base_offset;
1049 return offset;
1050}
1051
f3bf9224 1052/* forward declaration for a mutually recursive function */
43057304 1053static int packed_object_info(struct packed_git *p, unsigned long offset,
f3bf9224
JH
1054 char *type, unsigned long *sizep);
1055
43057304 1056static int packed_delta_info(struct packed_git *p,
03e79c88 1057 struct pack_window **w_curs,
43057304 1058 unsigned long offset,
eb32d236
NP
1059 enum object_type kind,
1060 unsigned long obj_offset,
5db47c2b 1061 char *type,
43057304 1062 unsigned long *sizep)
5db47c2b 1063{
43057304 1064 unsigned long base_offset;
f3bf9224 1065
03e79c88
SP
1066 offset = get_delta_base(p, w_curs, offset, kind,
1067 obj_offset, &base_offset);
f3bf9224 1068
c62266f3
JH
1069 /* We choose to only get the type of the base object and
1070 * ignore potentially corrupt pack file that expects the delta
1071 * based on a base with a wrong size. This saves tons of
1072 * inflate() calls.
1073 */
43057304 1074 if (packed_object_info(p, base_offset, type, NULL))
c62266f3 1075 die("cannot get info for delta-pack base");
5db47c2b 1076
c62266f3
JH
1077 if (sizep) {
1078 const unsigned char *data;
079afb18 1079 unsigned char delta_head[20], *in;
c62266f3
JH
1080 unsigned long result_size;
1081 z_stream stream;
1082 int st;
1083
1084 memset(&stream, 0, sizeof(stream));
c62266f3
JH
1085 stream.next_out = delta_head;
1086 stream.avail_out = sizeof(delta_head);
1087
1088 inflateInit(&stream);
079afb18
SP
1089 do {
1090 in = use_pack(p, w_curs, offset, &stream.avail_in);
1091 stream.next_in = in;
1092 st = inflate(&stream, Z_FINISH);
1093 offset += stream.next_in - in;
1094 } while ((st == Z_OK || st == Z_BUF_ERROR)
1095 && stream.total_out < sizeof(delta_head));
c62266f3
JH
1096 inflateEnd(&stream);
1097 if ((st != Z_STREAM_END) &&
1098 stream.total_out != sizeof(delta_head))
1099 die("delta data unpack-initial failed");
1100
1101 /* Examine the initial part of the delta to figure out
1102 * the result size.
1103 */
1104 data = delta_head;
8960844a
NP
1105
1106 /* ignore base size */
1107 get_delta_hdr_size(&data, delta_head+sizeof(delta_head));
5db47c2b 1108
c62266f3 1109 /* Read the result size */
8960844a 1110 result_size = get_delta_hdr_size(&data, delta_head+sizeof(delta_head));
c62266f3
JH
1111 *sizep = result_size;
1112 }
5db47c2b
JH
1113 return 0;
1114}
1115
03e79c88
SP
1116static unsigned long unpack_object_header(struct packed_git *p,
1117 struct pack_window **w_curs,
1118 unsigned long offset,
1119 enum object_type *type,
1120 unsigned long *sizep)
a733cb60 1121{
03e79c88
SP
1122 unsigned char *base;
1123 unsigned int left;
ad1ed5ee 1124 unsigned long used;
a733cb60 1125
8d8a4ea5
SP
1126 /* use_pack() assures us we have [base, base + 20) available
1127 * as a range that we can look at at. (Its actually the hash
1128 * size that is assurred.) With our object header encoding
1129 * the maximum deflated object size is 2^137, which is just
1130 * insane, so we know won't exceed what we have been given.
1131 */
03e79c88
SP
1132 base = use_pack(p, w_curs, offset, &left);
1133 used = unpack_object_header_gently(base, left, type, sizep);
ad1ed5ee
JH
1134 if (!used)
1135 die("object offset outside of pack file");
1136
1137 return offset + used;
a733cb60
LT
1138}
1139
43057304
NP
1140void packed_object_info_detail(struct packed_git *p,
1141 unsigned long offset,
ad8c80a5
JH
1142 char *type,
1143 unsigned long *size,
1144 unsigned long *store_size,
f8f135c9 1145 unsigned int *delta_chain_length,
ad8c80a5
JH
1146 unsigned char *base_sha1)
1147{
03e79c88 1148 struct pack_window *w_curs = NULL;
eb32d236 1149 unsigned long obj_offset, val;
43057304 1150 unsigned char *next_sha1;
ad8c80a5
JH
1151 enum object_type kind;
1152
43057304 1153 *delta_chain_length = 0;
eb32d236 1154 obj_offset = offset;
03e79c88 1155 offset = unpack_object_header(p, &w_curs, offset, &kind, size);
43057304
NP
1156
1157 for (;;) {
1158 switch (kind) {
1159 default:
08a19d87 1160 die("pack %s contains unknown object type %d",
43057304
NP
1161 p->pack_name, kind);
1162 case OBJ_COMMIT:
1163 case OBJ_TREE:
1164 case OBJ_BLOB:
1165 case OBJ_TAG:
1166 strcpy(type, type_names[kind]);
1167 *store_size = 0; /* notyet */
03e79c88 1168 unuse_pack(&w_curs);
43057304 1169 return;
eb32d236 1170 case OBJ_OFS_DELTA:
03e79c88
SP
1171 get_delta_base(p, &w_curs, offset, kind,
1172 obj_offset, &offset);
eb32d236
NP
1173 if (*delta_chain_length == 0) {
1174 /* TODO: find base_sha1 as pointed by offset */
1175 }
1176 break;
1177 case OBJ_REF_DELTA:
03e79c88 1178 next_sha1 = use_pack(p, &w_curs, offset, NULL);
43057304
NP
1179 if (*delta_chain_length == 0)
1180 hashcpy(base_sha1, next_sha1);
1181 offset = find_pack_entry_one(next_sha1, p);
1182 break;
1183 }
eb32d236 1184 obj_offset = offset;
03e79c88 1185 offset = unpack_object_header(p, &w_curs, offset, &kind, &val);
43057304 1186 (*delta_chain_length)++;
ad8c80a5 1187 }
ad8c80a5
JH
1188}
1189
43057304 1190static int packed_object_info(struct packed_git *p, unsigned long offset,
1f688557
JH
1191 char *type, unsigned long *sizep)
1192{
03e79c88 1193 struct pack_window *w_curs = NULL;
eb32d236 1194 unsigned long size, obj_offset = offset;
a733cb60 1195 enum object_type kind;
03e79c88 1196 int r;
5db47c2b 1197
03e79c88 1198 offset = unpack_object_header(p, &w_curs, offset, &kind, &size);
5db47c2b 1199
a733cb60 1200 switch (kind) {
eb32d236
NP
1201 case OBJ_OFS_DELTA:
1202 case OBJ_REF_DELTA:
03e79c88
SP
1203 r = packed_delta_info(p, &w_curs, offset, kind,
1204 obj_offset, type, sizep);
1205 unuse_pack(&w_curs);
1206 return r;
a733cb60 1207 case OBJ_COMMIT:
a733cb60 1208 case OBJ_TREE:
a733cb60 1209 case OBJ_BLOB:
a733cb60 1210 case OBJ_TAG:
5a18f540 1211 strcpy(type, type_names[kind]);
03e79c88 1212 unuse_pack(&w_curs);
a69d0943 1213 break;
1f688557 1214 default:
08a19d87 1215 die("pack %s contains unknown object type %d",
264b16b6 1216 p->pack_name, kind);
1f688557 1217 }
c62266f3
JH
1218 if (sizep)
1219 *sizep = size;
1f688557
JH
1220 return 0;
1221}
1222
eb950c19 1223static void *unpack_compressed_entry(struct packed_git *p,
03e79c88 1224 struct pack_window **w_curs,
eb950c19
SP
1225 unsigned long offset,
1226 unsigned long size)
de530aaa
SP
1227{
1228 int st;
1229 z_stream stream;
079afb18 1230 unsigned char *buffer, *in;
de530aaa
SP
1231
1232 buffer = xmalloc(size + 1);
1233 buffer[size] = 0;
1234 memset(&stream, 0, sizeof(stream));
de530aaa
SP
1235 stream.next_out = buffer;
1236 stream.avail_out = size;
1237
1238 inflateInit(&stream);
079afb18
SP
1239 do {
1240 in = use_pack(p, w_curs, offset, &stream.avail_in);
1241 stream.next_in = in;
1242 st = inflate(&stream, Z_FINISH);
1243 offset += stream.next_in - in;
1244 } while (st == Z_OK || st == Z_BUF_ERROR);
de530aaa
SP
1245 inflateEnd(&stream);
1246 if ((st != Z_STREAM_END) || stream.total_out != size) {
1247 free(buffer);
1248 return NULL;
1249 }
1250
1251 return buffer;
1252}
1253
eb950c19 1254static void *unpack_delta_entry(struct packed_git *p,
03e79c88 1255 struct pack_window **w_curs,
eb950c19 1256 unsigned long offset,
1f688557 1257 unsigned long delta_size,
eb32d236
NP
1258 enum object_type kind,
1259 unsigned long obj_offset,
1f688557 1260 char *type,
eb950c19 1261 unsigned long *sizep)
1f688557 1262{
7c3e8be3 1263 void *delta_data, *result, *base;
43057304 1264 unsigned long result_size, base_size, base_offset;
43057304 1265
03e79c88
SP
1266 offset = get_delta_base(p, w_curs, offset, kind,
1267 obj_offset, &base_offset);
4d703a1a 1268 base = unpack_entry(p, base_offset, type, &base_size);
67686d95 1269 if (!base)
43057304
NP
1270 die("failed to read delta base object at %lu from %s",
1271 base_offset, p->pack_name);
67686d95 1272
03e79c88 1273 delta_data = unpack_compressed_entry(p, w_curs, offset, delta_size);
1f688557
JH
1274 result = patch_delta(base, base_size,
1275 delta_data, delta_size,
1276 &result_size);
1277 if (!result)
1278 die("failed to apply delta");
1279 free(delta_data);
1280 free(base);
1281 *sizep = result_size;
1282 return result;
1283}
1284
4d703a1a 1285void *unpack_entry(struct packed_git *p, unsigned long offset,
1f688557
JH
1286 char *type, unsigned long *sizep)
1287{
03e79c88 1288 struct pack_window *w_curs = NULL;
4d703a1a
SP
1289 unsigned long size, obj_offset = offset;
1290 enum object_type kind;
f9253394 1291 void *retval;
1f688557 1292
03e79c88 1293 offset = unpack_object_header(p, &w_curs, offset, &kind, &size);
a733cb60 1294 switch (kind) {
eb32d236
NP
1295 case OBJ_OFS_DELTA:
1296 case OBJ_REF_DELTA:
03e79c88
SP
1297 retval = unpack_delta_entry(p, &w_curs, offset, size,
1298 kind, obj_offset, type, sizep);
4d703a1a 1299 break;
a733cb60 1300 case OBJ_COMMIT:
a733cb60 1301 case OBJ_TREE:
a733cb60 1302 case OBJ_BLOB:
a733cb60 1303 case OBJ_TAG:
5a18f540
SP
1304 strcpy(type, type_names[kind]);
1305 *sizep = size;
03e79c88 1306 retval = unpack_compressed_entry(p, &w_curs, offset, size);
4d703a1a 1307 break;
1f688557 1308 default:
4d703a1a 1309 die("unknown object type %i in %s", kind, p->pack_name);
1f688557 1310 }
03e79c88 1311 unuse_pack(&w_curs);
4d703a1a 1312 return retval;
1f688557
JH
1313}
1314
9a217f2a
JH
1315int num_packed_objects(const struct packed_git *p)
1316{
f9253394 1317 /* See check_packed_git_idx() */
9a217f2a
JH
1318 return (p->index_size - 20 - 20 - 4*256) / 24;
1319}
1320
1321int nth_packed_object_sha1(const struct packed_git *p, int n,
1322 unsigned char* sha1)
1323{
1324 void *index = p->index_base + 256;
1325 if (n < 0 || num_packed_objects(p) <= n)
1326 return -1;
e702496e 1327 hashcpy(sha1, (unsigned char *) index + (24 * n) + 4);
9a217f2a
JH
1328 return 0;
1329}
1330
43057304
NP
1331unsigned long find_pack_entry_one(const unsigned char *sha1,
1332 struct packed_git *p)
1f688557 1333{
4d235c80 1334 unsigned int *level1_ofs = p->index_base;
1f688557
JH
1335 int hi = ntohl(level1_ofs[*sha1]);
1336 int lo = ((*sha1 == 0x0) ? 0 : ntohl(level1_ofs[*sha1 - 1]));
1337 void *index = p->index_base + 256;
1338
1339 do {
1340 int mi = (lo + hi) / 2;
a89fccd2 1341 int cmp = hashcmp((unsigned char *)index + (24 * mi) + 4, sha1);
43057304
NP
1342 if (!cmp)
1343 return ntohl(*((unsigned int *) ((char *) index + (24 * mi))));
1f688557
JH
1344 if (cmp > 0)
1345 hi = mi;
1346 else
1347 lo = mi+1;
1348 } while (lo < hi);
1349 return 0;
1350}
1351
d4ff6d92
SP
1352static int matches_pack_name(struct packed_git *p, const char *ig)
1353{
1354 const char *last_c, *c;
1355
1356 if (!strcmp(p->pack_name, ig))
1357 return 0;
1358
1359 for (c = p->pack_name, last_c = c; *c;)
1360 if (*c == '/')
1361 last_c = ++c;
1362 else
1363 ++c;
1364 if (!strcmp(last_c, ig))
1365 return 0;
1366
1367 return 1;
1368}
1369
106d710b 1370static int find_pack_entry(const unsigned char *sha1, struct pack_entry *e, const char **ignore_packed)
1f688557
JH
1371{
1372 struct packed_git *p;
43057304
NP
1373 unsigned long offset;
1374
1f688557
JH
1375 prepare_packed_git();
1376
1377 for (p = packed_git; p; p = p->next) {
106d710b
JH
1378 if (ignore_packed) {
1379 const char **ig;
1380 for (ig = ignore_packed; *ig; ig++)
d4ff6d92 1381 if (!matches_pack_name(p, *ig))
106d710b
JH
1382 break;
1383 if (*ig)
1384 continue;
1385 }
43057304
NP
1386 offset = find_pack_entry_one(sha1, p);
1387 if (offset) {
1388 e->offset = offset;
1389 e->p = p;
1390 hashcpy(e->sha1, sha1);
1f688557 1391 return 1;
43057304 1392 }
1f688557
JH
1393 }
1394 return 0;
1395}
1396
bf592c50
DB
1397struct packed_git *find_sha1_pack(const unsigned char *sha1,
1398 struct packed_git *packs)
1399{
1400 struct packed_git *p;
bf592c50
DB
1401
1402 for (p = packs; p; p = p->next) {
43057304 1403 if (find_pack_entry_one(sha1, p))
bf592c50
DB
1404 return p;
1405 }
1406 return NULL;
1407
1408}
1409
f0df4ed5 1410static int sha1_loose_object_info(const unsigned char *sha1, char *type, unsigned long *sizep)
65c2e0c3 1411{
36e4d74a 1412 int status;
65c2e0c3
JH
1413 unsigned long mapsize, size;
1414 void *map;
1415 z_stream stream;
36e4d74a 1416 char hdr[128];
65c2e0c3 1417
bb6b8e4f 1418 map = map_sha1_file(sha1, &mapsize);
f0df4ed5
JS
1419 if (!map)
1420 return error("unable to find %s", sha1_to_hex(sha1));
36e4d74a
JH
1421 if (unpack_sha1_header(&stream, map, mapsize, hdr, sizeof(hdr)) < 0)
1422 status = error("unable to unpack %s header",
1423 sha1_to_hex(sha1));
1424 if (parse_sha1_header(hdr, type, &size) < 0)
1425 status = error("unable to parse %s header", sha1_to_hex(sha1));
c4584ae3 1426 else {
65c2e0c3 1427 status = 0;
c62266f3
JH
1428 if (sizep)
1429 *sizep = size;
65c2e0c3 1430 }
65c2e0c3
JH
1431 inflateEnd(&stream);
1432 munmap(map, mapsize);
1433 return status;
1434}
1435
f0df4ed5
JS
1436int sha1_object_info(const unsigned char *sha1, char *type, unsigned long *sizep)
1437{
f0df4ed5
JS
1438 struct pack_entry e;
1439
1440 if (!find_pack_entry(sha1, &e, NULL)) {
1441 reprepare_packed_git();
1442 if (!find_pack_entry(sha1, &e, NULL))
1443 return sha1_loose_object_info(sha1, type, sizep);
1444 }
03e79c88 1445 return packed_object_info(e.p, e.offset, type, sizep);
f0df4ed5
JS
1446}
1447
1f688557
JH
1448static void *read_packed_sha1(const unsigned char *sha1, char *type, unsigned long *size)
1449{
1450 struct pack_entry e;
1451
106d710b 1452 if (!find_pack_entry(sha1, &e, NULL)) {
1f688557
JH
1453 error("cannot read sha1_file for %s", sha1_to_hex(sha1));
1454 return NULL;
1455 }
4d703a1a 1456 return unpack_entry(e.p, e.offset, type, size);
1f688557
JH
1457}
1458
0fcfd160
LT
1459void * read_sha1_file(const unsigned char *sha1, char *type, unsigned long *size)
1460{
1461 unsigned long mapsize;
1462 void *map, *buf;
ab90ea5d 1463 struct pack_entry e;
0fcfd160 1464
106d710b 1465 if (find_pack_entry(sha1, &e, NULL))
ab90ea5d 1466 return read_packed_sha1(sha1, type, size);
bb6b8e4f 1467 map = map_sha1_file(sha1, &mapsize);
0fcfd160
LT
1468 if (map) {
1469 buf = unpack_sha1_file(map, mapsize, type, size);
1470 munmap(map, mapsize);
1471 return buf;
1472 }
637cdd9d 1473 reprepare_packed_git();
106d710b 1474 if (find_pack_entry(sha1, &e, NULL))
637cdd9d 1475 return read_packed_sha1(sha1, type, size);
ab90ea5d 1476 return NULL;
0fcfd160
LT
1477}
1478
40469ee9 1479void *read_object_with_reference(const unsigned char *sha1,
bf0f910d 1480 const char *required_type,
40469ee9
JH
1481 unsigned long *size,
1482 unsigned char *actual_sha1_return)
f4913f91
JH
1483{
1484 char type[20];
1485 void *buffer;
1486 unsigned long isize;
40469ee9 1487 unsigned char actual_sha1[20];
f4913f91 1488
e702496e 1489 hashcpy(actual_sha1, sha1);
40469ee9
JH
1490 while (1) {
1491 int ref_length = -1;
1492 const char *ref_type = NULL;
f4913f91 1493
40469ee9
JH
1494 buffer = read_sha1_file(actual_sha1, type, &isize);
1495 if (!buffer)
1496 return NULL;
1497 if (!strcmp(type, required_type)) {
1498 *size = isize;
1499 if (actual_sha1_return)
e702496e 1500 hashcpy(actual_sha1_return, actual_sha1);
40469ee9
JH
1501 return buffer;
1502 }
1503 /* Handle references */
8e440259 1504 else if (!strcmp(type, commit_type))
40469ee9 1505 ref_type = "tree ";
8e440259 1506 else if (!strcmp(type, tag_type))
40469ee9
JH
1507 ref_type = "object ";
1508 else {
1509 free(buffer);
1510 return NULL;
1511 }
1512 ref_length = strlen(ref_type);
f4913f91 1513
40469ee9 1514 if (memcmp(buffer, ref_type, ref_length) ||
1d7f171c 1515 get_sha1_hex((char *) buffer + ref_length, actual_sha1)) {
40469ee9
JH
1516 free(buffer);
1517 return NULL;
1518 }
1cf58e72 1519 free(buffer);
40469ee9
JH
1520 /* Now we have the ID of the referred-to object in
1521 * actual_sha1. Check again. */
f4913f91 1522 }
f4913f91
JH
1523}
1524
972a9155
RS
1525static void write_sha1_file_prepare(void *buf, unsigned long len,
1526 const char *type, unsigned char *sha1,
1527 unsigned char *hdr, int *hdrlen)
d410c0f5
JH
1528{
1529 SHA_CTX c;
1530
1531 /* Generate the header */
1532 *hdrlen = sprintf((char *)hdr, "%s %lu", type, len)+1;
1533
1534 /* Sha1.. */
1535 SHA1_Init(&c);
1536 SHA1_Update(&c, hdr, *hdrlen);
1537 SHA1_Update(&c, buf, len);
1538 SHA1_Final(sha1, &c);
d410c0f5
JH
1539}
1540
230f1322
LT
1541/*
1542 * Link the tempfile to the final place, possibly creating the
1543 * last directory level as you do so.
1544 *
1545 * Returns the errno on failure, 0 on success.
1546 */
839837b9 1547static int link_temp_to_file(const char *tmpfile, const char *filename)
230f1322
LT
1548{
1549 int ret;
756aaf4a 1550 char *dir;
230f1322
LT
1551
1552 if (!link(tmpfile, filename))
1553 return 0;
1554
1555 /*
756aaf4a 1556 * Try to mkdir the last path component if that failed.
230f1322
LT
1557 *
1558 * Re-try the "link()" regardless of whether the mkdir
1559 * succeeds, since a race might mean that somebody
1560 * else succeeded.
1561 */
1562 ret = errno;
756aaf4a
SP
1563 dir = strrchr(filename, '/');
1564 if (dir) {
1565 *dir = 0;
866cae0d 1566 if (!mkdir(filename, 0777) && adjust_shared_perm(filename)) {
91c23e48 1567 *dir = '/';
756aaf4a 1568 return -2;
91c23e48 1569 }
756aaf4a
SP
1570 *dir = '/';
1571 if (!link(tmpfile, filename))
1572 return 0;
1573 ret = errno;
230f1322
LT
1574 }
1575 return ret;
1576}
1577
1578/*
1579 * Move the just written object into its final resting place
1580 */
839837b9 1581int move_temp_to_file(const char *tmpfile, const char *filename)
230f1322
LT
1582{
1583 int ret = link_temp_to_file(tmpfile, filename);
7ebb6fca
LT
1584
1585 /*
1586 * Coda hack - coda doesn't like cross-directory links,
1587 * so we fall back to a rename, which will mean that it
1588 * won't be able to check collisions, but that's not a
1589 * big deal.
1590 *
1591 * The same holds for FAT formatted media.
1592 *
1593 * When this succeeds, we just return 0. We have nothing
1594 * left to unlink.
1595 */
1596 if (ret && ret != EEXIST) {
1597 if (!rename(tmpfile, filename))
230f1322 1598 return 0;
9e48b389 1599 ret = errno;
230f1322
LT
1600 }
1601 unlink(tmpfile);
1602 if (ret) {
1603 if (ret != EEXIST) {
916d081b 1604 return error("unable to write sha1 filename %s: %s\n", filename, strerror(ret));
230f1322
LT
1605 }
1606 /* FIXME!!! Collision check here ? */
1607 }
1608
1609 return 0;
1610}
1611
4d548150
LT
1612static int write_buffer(int fd, const void *buf, size_t len)
1613{
93822c22 1614 ssize_t size;
4d548150 1615
93822c22
AW
1616 size = write_in_full(fd, buf, len);
1617 if (!size)
1618 return error("file write: disk full");
1619 if (size < 0)
1620 return error("file write error (%s)", strerror(errno));
4d548150
LT
1621 return 0;
1622}
1623
93821bd9
LT
1624static int write_binary_header(unsigned char *hdr, enum object_type type, unsigned long len)
1625{
1626 int hdr_len;
1627 unsigned char c;
1628
1629 c = (type << 4) | (len & 15);
1630 len >>= 4;
1631 hdr_len = 1;
1632 while (len) {
1633 *hdr++ = c | 0x80;
1634 hdr_len++;
1635 c = (len & 0x7f);
1636 len >>= 7;
1637 }
1638 *hdr = c;
1639 return hdr_len;
1640}
1641
1642static void setup_object_header(z_stream *stream, const char *type, unsigned long len)
1643{
1644 int obj_type, hdr;
1645
1646 if (use_legacy_headers) {
1647 while (deflate(stream, 0) == Z_OK)
1648 /* nothing */;
1649 return;
1650 }
1651 if (!strcmp(type, blob_type))
1652 obj_type = OBJ_BLOB;
1653 else if (!strcmp(type, tree_type))
1654 obj_type = OBJ_TREE;
1655 else if (!strcmp(type, commit_type))
1656 obj_type = OBJ_COMMIT;
1657 else if (!strcmp(type, tag_type))
1658 obj_type = OBJ_TAG;
1659 else
1660 die("trying to generate bogus object of type '%s'", type);
1661 hdr = write_binary_header(stream->next_out, obj_type, len);
1662 stream->total_out = hdr;
1663 stream->next_out += hdr;
1664 stream->avail_out -= hdr;
1665}
1666
abdc3fc8
RS
1667int hash_sha1_file(void *buf, unsigned long len, const char *type,
1668 unsigned char *sha1)
1669{
1670 unsigned char hdr[50];
1671 int hdrlen;
1672 write_sha1_file_prepare(buf, len, type, sha1, hdr, &hdrlen);
1673 return 0;
1674}
1675
bf0f910d 1676int write_sha1_file(void *buf, unsigned long len, const char *type, unsigned char *returnsha1)
0fcfd160
LT
1677{
1678 int size;
bf0f910d 1679 unsigned char *compressed;
0fcfd160
LT
1680 z_stream stream;
1681 unsigned char sha1[20];
706bc531 1682 char *filename;
aac17941 1683 static char tmpfile[PATH_MAX];
bf0f910d 1684 unsigned char hdr[50];
230f1322 1685 int fd, hdrlen;
a44c9a5e 1686
d410c0f5
JH
1687 /* Normally if we have it in the pack then we do not bother writing
1688 * it out into .git/objects/??/?{38} file.
1689 */
972a9155
RS
1690 write_sha1_file_prepare(buf, len, type, sha1, hdr, &hdrlen);
1691 filename = sha1_file_name(sha1);
706bc531 1692 if (returnsha1)
e702496e 1693 hashcpy(returnsha1, sha1);
d410c0f5
JH
1694 if (has_sha1_file(sha1))
1695 return 0;
aac17941
LT
1696 fd = open(filename, O_RDONLY);
1697 if (fd >= 0) {
706bc531 1698 /*
aac17941
LT
1699 * FIXME!!! We might do collision checking here, but we'd
1700 * need to uncompress the old file and check it. Later.
706bc531 1701 */
aac17941 1702 close(fd);
706bc531
LT
1703 return 0;
1704 }
1705
aac17941 1706 if (errno != ENOENT) {
916d081b 1707 return error("sha1 file %s: %s\n", filename, strerror(errno));
aac17941
LT
1708 }
1709
1710 snprintf(tmpfile, sizeof(tmpfile), "%s/obj_XXXXXX", get_object_directory());
ace1534d 1711
aac17941
LT
1712 fd = mkstemp(tmpfile);
1713 if (fd < 0) {
916d081b
PB
1714 if (errno == EPERM)
1715 return error("insufficient permission for adding an object to repository database %s\n", get_object_directory());
1716 else
1717 return error("unable to create temporary sha1 filename %s: %s\n", tmpfile, strerror(errno));
aac17941
LT
1718 }
1719
0fcfd160
LT
1720 /* Set it up */
1721 memset(&stream, 0, sizeof(stream));
12f6c308 1722 deflateInit(&stream, zlib_compression_level);
93821bd9 1723 size = 8 + deflateBound(&stream, len+hdrlen);
812666c8 1724 compressed = xmalloc(size);
0fcfd160
LT
1725
1726 /* Compress it */
0fcfd160
LT
1727 stream.next_out = compressed;
1728 stream.avail_out = size;
a44c9a5e
LT
1729
1730 /* First header.. */
1731 stream.next_in = hdr;
1732 stream.avail_in = hdrlen;
93821bd9 1733 setup_object_header(&stream, type, len);
a44c9a5e
LT
1734
1735 /* Then the data itself.. */
1736 stream.next_in = buf;
1737 stream.avail_in = len;
0fcfd160
LT
1738 while (deflate(&stream, Z_FINISH) == Z_OK)
1739 /* nothing */;
1740 deflateEnd(&stream);
1741 size = stream.total_out;
1742
4d548150
LT
1743 if (write_buffer(fd, compressed, size) < 0)
1744 die("unable to write sha1 file");
aac17941 1745 fchmod(fd, 0444);
706bc531 1746 close(fd);
383f85b7 1747 free(compressed);
0fcfd160 1748
230f1322 1749 return move_temp_to_file(tmpfile, filename);
0fcfd160 1750}
8237b185 1751
4d548150
LT
1752/*
1753 * We need to unpack and recompress the object for writing
1754 * it out to a different file.
1755 */
1756static void *repack_object(const unsigned char *sha1, unsigned long *objsize)
a5eda52b 1757{
4d548150 1758 size_t size;
a5eda52b 1759 z_stream stream;
4d548150
LT
1760 unsigned char *unpacked;
1761 unsigned long len;
1762 char type[20];
1763 char hdr[50];
1764 int hdrlen;
1765 void *buf;
bfc66daf 1766
a9486b02 1767 /* need to unpack and recompress it by itself */
4d548150 1768 unpacked = read_packed_sha1(sha1, type, &len);
a5eda52b 1769
4d548150 1770 hdrlen = sprintf(hdr, "%s %lu", type, len) + 1;
a5eda52b 1771
4d548150
LT
1772 /* Set it up */
1773 memset(&stream, 0, sizeof(stream));
12f6c308 1774 deflateInit(&stream, zlib_compression_level);
4d548150
LT
1775 size = deflateBound(&stream, len + hdrlen);
1776 buf = xmalloc(size);
a5eda52b 1777
4d548150
LT
1778 /* Compress it */
1779 stream.next_out = buf;
1780 stream.avail_out = size;
a5eda52b 1781
4d548150
LT
1782 /* First header.. */
1783 stream.next_in = (void *)hdr;
1784 stream.avail_in = hdrlen;
1785 while (deflate(&stream, 0) == Z_OK)
1786 /* nothing */;
bfc66daf 1787
4d548150
LT
1788 /* Then the data itself.. */
1789 stream.next_in = unpacked;
1790 stream.avail_in = len;
1791 while (deflate(&stream, Z_FINISH) == Z_OK)
1792 /* nothing */;
1793 deflateEnd(&stream);
1794 free(unpacked);
bfc66daf 1795
4d548150
LT
1796 *objsize = stream.total_out;
1797 return buf;
1798}
1799
1800int write_sha1_to_fd(int fd, const unsigned char *sha1)
1801{
1802 int retval;
1803 unsigned long objsize;
bb6b8e4f 1804 void *buf = map_sha1_file(sha1, &objsize);
4d548150
LT
1805
1806 if (buf) {
1807 retval = write_buffer(fd, buf, objsize);
1808 munmap(buf, objsize);
1809 return retval;
1810 }
1811
1812 buf = repack_object(sha1, &objsize);
1813 retval = write_buffer(fd, buf, objsize);
1814 free(buf);
1815 return retval;
a5eda52b
DB
1816}
1817
70b9829e
DB
1818int write_sha1_from_fd(const unsigned char *sha1, int fd, char *buffer,
1819 size_t bufsize, size_t *bufposn)
8237b185 1820{
230f1322 1821 char tmpfile[PATH_MAX];
8237b185
DB
1822 int local;
1823 z_stream stream;
1824 unsigned char real_sha1[20];
bf0f910d 1825 unsigned char discard[4096];
8237b185
DB
1826 int ret;
1827 SHA_CTX c;
1828
230f1322 1829 snprintf(tmpfile, sizeof(tmpfile), "%s/obj_XXXXXX", get_object_directory());
8237b185 1830
230f1322 1831 local = mkstemp(tmpfile);
916d081b
PB
1832 if (local < 0) {
1833 if (errno == EPERM)
1834 return error("insufficient permission for adding an object to repository database %s\n", get_object_directory());
1835 else
1836 return error("unable to create temporary sha1 filename %s: %s\n", tmpfile, strerror(errno));
1837 }
8237b185
DB
1838
1839 memset(&stream, 0, sizeof(stream));
1840
1841 inflateInit(&stream);
1842
1843 SHA1_Init(&c);
1844
1845 do {
1846 ssize_t size;
70b9829e
DB
1847 if (*bufposn) {
1848 stream.avail_in = *bufposn;
96ad15ae 1849 stream.next_in = (unsigned char *) buffer;
70b9829e
DB
1850 do {
1851 stream.next_out = discard;
1852 stream.avail_out = sizeof(discard);
1853 ret = inflate(&stream, Z_SYNC_FLUSH);
1854 SHA1_Update(&c, discard, sizeof(discard) -
1855 stream.avail_out);
1856 } while (stream.avail_in && ret == Z_OK);
4d548150
LT
1857 if (write_buffer(local, buffer, *bufposn - stream.avail_in) < 0)
1858 die("unable to write sha1 file");
70b9829e
DB
1859 memmove(buffer, buffer + *bufposn - stream.avail_in,
1860 stream.avail_in);
1861 *bufposn = stream.avail_in;
1862 if (ret != Z_OK)
1863 break;
1864 }
93d26e4c 1865 size = xread(fd, buffer + *bufposn, bufsize - *bufposn);
8237b185
DB
1866 if (size <= 0) {
1867 close(local);
230f1322 1868 unlink(tmpfile);
8237b185
DB
1869 if (!size)
1870 return error("Connection closed?");
1871 perror("Reading from connection");
1872 return -1;
1873 }
70b9829e
DB
1874 *bufposn += size;
1875 } while (1);
8237b185
DB
1876 inflateEnd(&stream);
1877
1878 close(local);
1879 SHA1_Final(real_sha1, &c);
1880 if (ret != Z_STREAM_END) {
230f1322 1881 unlink(tmpfile);
8237b185
DB
1882 return error("File %s corrupted", sha1_to_hex(sha1));
1883 }
a89fccd2 1884 if (hashcmp(sha1, real_sha1)) {
230f1322 1885 unlink(tmpfile);
bd2afde8 1886 return error("File %s has bad hash", sha1_to_hex(sha1));
8237b185 1887 }
230f1322
LT
1888
1889 return move_temp_to_file(tmpfile, sha1_file_name(sha1));
8237b185
DB
1890}
1891
bf592c50
DB
1892int has_pack_index(const unsigned char *sha1)
1893{
1894 struct stat st;
1895 if (stat(sha1_pack_index_name(sha1), &st))
1896 return 0;
1897 return 1;
1898}
1899
1900int has_pack_file(const unsigned char *sha1)
1901{
1902 struct stat st;
1903 if (stat(sha1_pack_name(sha1), &st))
1904 return 0;
1905 return 1;
1906}
1907
106d710b 1908int has_sha1_pack(const unsigned char *sha1, const char **ignore_packed)
dade09c2
LT
1909{
1910 struct pack_entry e;
106d710b 1911 return find_pack_entry(sha1, &e, ignore_packed);
dade09c2
LT
1912}
1913
8237b185
DB
1914int has_sha1_file(const unsigned char *sha1)
1915{
8237b185 1916 struct stat st;
1f688557
JH
1917 struct pack_entry e;
1918
106d710b 1919 if (find_pack_entry(sha1, &e, NULL))
1f688557 1920 return 1;
ab90ea5d 1921 return find_sha1_file(sha1, &st) ? 1 : 0;
8237b185 1922}
74400e71 1923
e7332f96
BE
1924/*
1925 * reads from fd as long as possible into a supplied buffer of size bytes.
82e5a82f 1926 * If necessary the buffer's size is increased using realloc()
e7332f96
BE
1927 *
1928 * returns 0 if anything went fine and -1 otherwise
1929 *
1930 * NOTE: both buf and size may change, but even when -1 is returned
1931 * you still have to free() it yourself.
1932 */
1933int read_pipe(int fd, char** return_buf, unsigned long* return_size)
024510c8 1934{
e7332f96
BE
1935 char* buf = *return_buf;
1936 unsigned long size = *return_size;
1937 int iret;
024510c8 1938 unsigned long off = 0;
e7332f96 1939
024510c8 1940 do {
e7332f96 1941 iret = xread(fd, buf + off, size - off);
024510c8
DB
1942 if (iret > 0) {
1943 off += iret;
1944 if (off == size) {
1945 size *= 2;
83572c1a 1946 buf = xrealloc(buf, size);
024510c8
DB
1947 }
1948 }
1949 } while (iret > 0);
e7332f96
BE
1950
1951 *return_buf = buf;
1952 *return_size = off;
1953
1954 if (iret < 0)
1955 return -1;
1956 return 0;
1957}
1958
1959int index_pipe(unsigned char *sha1, int fd, const char *type, int write_object)
1960{
1961 unsigned long size = 4096;
2d7320d0 1962 char *buf = xmalloc(size);
e7332f96 1963 int ret;
e7332f96
BE
1964
1965 if (read_pipe(fd, &buf, &size)) {
024510c8
DB
1966 free(buf);
1967 return -1;
1968 }
e7332f96 1969
024510c8 1970 if (!type)
8e440259 1971 type = blob_type;
024510c8 1972 if (write_object)
e7332f96 1973 ret = write_sha1_file(buf, size, type, sha1);
abdc3fc8
RS
1974 else
1975 ret = hash_sha1_file(buf, size, type, sha1);
024510c8
DB
1976 free(buf);
1977 return ret;
1978}
1979
7672db20 1980int index_fd(unsigned char *sha1, int fd, struct stat *st, int write_object, const char *type)
74400e71 1981{
74400e71 1982 unsigned long size = st->st_size;
aac17941
LT
1983 void *buf;
1984 int ret;
74400e71 1985
aac17941 1986 buf = "";
74400e71 1987 if (size)
c4712e45 1988 buf = xmmap(NULL, size, PROT_READ, MAP_PRIVATE, fd, 0);
74400e71 1989 close(fd);
74400e71 1990
7672db20 1991 if (!type)
8e440259 1992 type = blob_type;
7672db20
BL
1993 if (write_object)
1994 ret = write_sha1_file(buf, size, type, sha1);
abdc3fc8
RS
1995 else
1996 ret = hash_sha1_file(buf, size, type, sha1);
aac17941
LT
1997 if (size)
1998 munmap(buf, size);
1999 return ret;
74400e71 2000}
ec1fcc16
JH
2001
2002int index_path(unsigned char *sha1, const char *path, struct stat *st, int write_object)
2003{
2004 int fd;
2005 char *target;
2006
2007 switch (st->st_mode & S_IFMT) {
2008 case S_IFREG:
2009 fd = open(path, O_RDONLY);
2010 if (fd < 0)
2011 return error("open(\"%s\"): %s", path,
2012 strerror(errno));
2013 if (index_fd(sha1, fd, st, write_object, NULL) < 0)
2014 return error("%s: failed to insert into database",
2015 path);
2016 break;
2017 case S_IFLNK:
2018 target = xmalloc(st->st_size+1);
2019 if (readlink(path, target, st->st_size+1) != st->st_size) {
2020 char *errstr = strerror(errno);
2021 free(target);
2022 return error("readlink(\"%s\"): %s", path,
2023 errstr);
2024 }
abdc3fc8
RS
2025 if (!write_object)
2026 hash_sha1_file(target, st->st_size, blob_type, sha1);
2027 else if (write_sha1_file(target, st->st_size, blob_type, sha1))
ec1fcc16
JH
2028 return error("%s: failed to insert into database",
2029 path);
2030 free(target);
2031 break;
2032 default:
2033 return error("%s: unsupported file type", path);
2034 }
2035 return 0;
2036}