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