Default core.packdGitWindowSize to 1 MiB if NO_MMAP.
[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 }
d5a63b99
JH
358 map = mmap(NULL, st.st_size, PROT_READ, MAP_PRIVATE, fd, 0);
359 close(fd);
360 if (map == MAP_FAILED)
361 return;
362
c2f493a4
MW
363 link_alt_odb_entries(map, map + st.st_size, '\n', relative_base, depth);
364
d5a63b99 365 munmap(map, st.st_size);
ace1534d
JH
366}
367
c2f493a4
MW
368void prepare_alt_odb(void)
369{
554fe20d 370 const char *alt;
c2f493a4
MW
371
372 alt = getenv(ALTERNATE_DB_ENVIRONMENT);
373 if (!alt) alt = "";
374
375 if (alt_odb_tail)
376 return;
377 alt_odb_tail = &alt_odb_list;
378 link_alt_odb_entries(alt, alt + strlen(alt), ':', NULL, 0);
379
380 read_info_alternates(get_object_directory(), 0);
381}
382
ace1534d
JH
383static char *find_sha1_file(const unsigned char *sha1, struct stat *st)
384{
ace1534d 385 char *name = sha1_file_name(sha1);
d5a63b99 386 struct alternate_object_database *alt;
ace1534d
JH
387
388 if (!stat(name, st))
389 return name;
9a217f2a 390 prepare_alt_odb();
d5a63b99
JH
391 for (alt = alt_odb_list; alt; alt = alt->next) {
392 name = alt->name;
ace1534d 393 fill_sha1_path(name, sha1);
d5a63b99
JH
394 if (!stat(alt->base, st))
395 return alt->base;
ace1534d
JH
396 }
397 return NULL;
398}
399
60bb8b14 400static unsigned int pack_used_ctr;
a53128b6
SP
401static unsigned int pack_mmap_calls;
402static unsigned int peak_pack_open_windows;
403static unsigned int pack_open_windows;
404static size_t peak_pack_mapped;
60bb8b14
SP
405static size_t pack_mapped;
406static size_t page_size;
9a217f2a 407struct packed_git *packed_git;
1f688557 408
a53128b6
SP
409void pack_report()
410{
411 fprintf(stderr,
412 "pack_report: getpagesize() = %10lu\n"
413 "pack_report: core.packedGitWindowSize = %10lu\n"
414 "pack_report: core.packedGitLimit = %10lu\n",
415 page_size,
416 packed_git_window_size,
417 packed_git_limit);
418 fprintf(stderr,
419 "pack_report: pack_used_ctr = %10u\n"
420 "pack_report: pack_mmap_calls = %10u\n"
421 "pack_report: pack_open_windows = %10u / %10u\n"
422 "pack_report: pack_mapped = %10lu / %10lu\n",
423 pack_used_ctr,
424 pack_mmap_calls,
425 pack_open_windows, peak_pack_open_windows,
426 pack_mapped, peak_pack_mapped);
427}
428
1f688557
JH
429static int check_packed_git_idx(const char *path, unsigned long *idx_size_,
430 void **idx_map_)
431{
432 void *idx_map;
433 unsigned int *index;
434 unsigned long idx_size;
435 int nr, i;
e93ec6f9 436 int fd = open(path, O_RDONLY);
1f688557
JH
437 struct stat st;
438 if (fd < 0)
439 return -1;
440 if (fstat(fd, &st)) {
441 close(fd);
442 return -1;
443 }
444 idx_size = st.st_size;
445 idx_map = mmap(NULL, idx_size, PROT_READ, MAP_PRIVATE, fd, 0);
446 close(fd);
447 if (idx_map == MAP_FAILED)
448 return -1;
449
450 index = idx_map;
4d235c80
LT
451 *idx_map_ = idx_map;
452 *idx_size_ = idx_size;
1f688557
JH
453
454 /* check index map */
f9253394 455 if (idx_size < 4*256 + 20 + 20)
1f688557
JH
456 return error("index file too small");
457 nr = 0;
458 for (i = 0; i < 256; i++) {
459 unsigned int n = ntohl(index[i]);
460 if (n < nr)
461 return error("non-monotonic index");
462 nr = n;
463 }
464
465 /*
466 * Total size:
467 * - 256 index entries 4 bytes each
468 * - 24-byte entries * nr (20-byte sha1 + 4-byte offset)
469 * - 20-byte SHA1 of the packfile
470 * - 20-byte SHA1 file checksum
471 */
472 if (idx_size != 4*256 + nr * 24 + 20 + 20)
473 return error("wrong index file size");
474
1f688557
JH
475 return 0;
476}
477
11daf39b
SP
478static void scan_windows(struct packed_git *p,
479 struct packed_git **lru_p,
480 struct pack_window **lru_w,
481 struct pack_window **lru_l)
1f688557 482{
11daf39b
SP
483 struct pack_window *w, *w_l;
484
485 for (w_l = NULL, w = p->windows; w; w = w->next) {
486 if (!w->inuse_cnt) {
487 if (!*lru_w || w->last_used < (*lru_w)->last_used) {
488 *lru_p = p;
489 *lru_w = w;
490 *lru_l = w_l;
54044bf8 491 }
54044bf8 492 }
11daf39b 493 w_l = w;
f9253394 494 }
11daf39b
SP
495}
496
497static int unuse_one_window(struct packed_git *current)
498{
499 struct packed_git *p, *lru_p = NULL;
500 struct pack_window *lru_w = NULL, *lru_l = NULL;
501
502 if (current)
503 scan_windows(current, &lru_p, &lru_w, &lru_l);
504 for (p = packed_git; p; p = p->next)
505 scan_windows(p, &lru_p, &lru_w, &lru_l);
54044bf8
SP
506 if (lru_p) {
507 munmap(lru_w->base, lru_w->len);
508 pack_mapped -= lru_w->len;
509 if (lru_l)
510 lru_l->next = lru_w->next;
511 else {
512 lru_p->windows = lru_w->next;
11daf39b 513 if (!lru_p->windows && lru_p != current) {
54044bf8
SP
514 close(lru_p->pack_fd);
515 lru_p->pack_fd = -1;
516 }
517 }
518 free(lru_w);
a53128b6 519 pack_open_windows--;
54044bf8
SP
520 return 1;
521 }
522 return 0;
f9253394
JH
523}
524
03e79c88 525void unuse_pack(struct pack_window **w_cursor)
f9253394 526{
03e79c88
SP
527 struct pack_window *w = *w_cursor;
528 if (w) {
529 w->inuse_cnt--;
530 *w_cursor = NULL;
531 }
1f688557
JH
532}
533
9bc879c1 534static void open_packed_git(struct packed_git *p)
1f688557 535{
9bc879c1
SP
536 struct stat st;
537 struct pack_header hdr;
538 unsigned char sha1[20];
539 unsigned char *idx_sha1;
540
541 p->pack_fd = open(p->pack_name, O_RDONLY);
542 if (p->pack_fd < 0 || fstat(p->pack_fd, &st))
543 die("packfile %s cannot be opened", p->pack_name);
544
545 /* If we created the struct before we had the pack we lack size. */
bf592c50 546 if (!p->pack_size) {
bf592c50
DB
547 if (!S_ISREG(st.st_mode))
548 die("packfile %s not a regular file", p->pack_name);
549 p->pack_size = st.st_size;
9bc879c1
SP
550 } else if (p->pack_size != st.st_size)
551 die("packfile %s size changed", p->pack_name);
552
553 /* Verify we recognize this pack file format. */
554 read_or_die(p->pack_fd, &hdr, sizeof(hdr));
555 if (hdr.hdr_signature != htonl(PACK_SIGNATURE))
556 die("file %s is not a GIT packfile", p->pack_name);
557 if (!pack_version_ok(hdr.hdr_version))
558 die("packfile %s is version %u and not supported"
559 " (try upgrading GIT to a newer version)",
560 p->pack_name, ntohl(hdr.hdr_version));
561
562 /* Verify the pack matches its index. */
563 if (num_packed_objects(p) != ntohl(hdr.hdr_entries))
564 die("packfile %s claims to have %u objects"
565 " while index size indicates %u objects",
566 p->pack_name, ntohl(hdr.hdr_entries),
567 num_packed_objects(p));
568 if (lseek(p->pack_fd, p->pack_size - sizeof(sha1), SEEK_SET) == -1)
569 die("end of packfile %s is unavailable", p->pack_name);
570 read_or_die(p->pack_fd, sha1, sizeof(sha1));
571 idx_sha1 = ((unsigned char *)p->index_base) + p->index_size - 40;
572 if (hashcmp(sha1, idx_sha1))
573 die("packfile %s does not match index", p->pack_name);
574}
575
60bb8b14
SP
576static int in_window(struct pack_window *win, unsigned long offset)
577{
578 /* We must promise at least 20 bytes (one hash) after the
579 * offset is available from this window, otherwise the offset
580 * is not actually in this window and a different window (which
581 * has that one hash excess) must be used. This is to support
582 * the object header and delta base parsing routines below.
583 */
584 off_t win_off = win->offset;
585 return win_off <= offset
586 && (offset + 20) <= (win_off + win->len);
587}
588
03e79c88
SP
589unsigned char* use_pack(struct packed_git *p,
590 struct pack_window **w_cursor,
591 unsigned long offset,
592 unsigned int *left)
9bc879c1 593{
60bb8b14 594 struct pack_window *win = *w_cursor;
03e79c88 595
9bc879c1
SP
596 if (p->pack_fd == -1)
597 open_packed_git(p);
60bb8b14
SP
598
599 /* Since packfiles end in a hash of their content and its
600 * pointless to ask for an offset into the middle of that
601 * hash, and the in_window function above wouldn't match
602 * don't allow an offset too close to the end of the file.
603 */
604 if (offset > (p->pack_size - 20))
605 die("offset beyond end of packfile (truncated pack?)");
606
607 if (!win || !in_window(win, offset)) {
608 if (win)
609 win->inuse_cnt--;
610 for (win = p->windows; win; win = win->next) {
611 if (in_window(win, offset))
612 break;
613 }
614 if (!win) {
615 if (!page_size)
616 page_size = getpagesize();
617 win = xcalloc(1, sizeof(*win));
618 win->offset = (offset / page_size) * page_size;
619 win->len = p->pack_size - win->offset;
620 if (win->len > packed_git_window_size)
621 win->len = packed_git_window_size;
622 pack_mapped += win->len;
11daf39b
SP
623 while (packed_git_limit < pack_mapped
624 && unuse_one_window(p))
60bb8b14
SP
625 ; /* nothing */
626 win->base = mmap(NULL, win->len,
627 PROT_READ, MAP_PRIVATE,
628 p->pack_fd, win->offset);
629 if (win->base == MAP_FAILED)
73b4e4be
SP
630 die("packfile %s cannot be mapped: %s",
631 p->pack_name,
632 strerror(errno));
a53128b6
SP
633 pack_mmap_calls++;
634 pack_open_windows++;
635 if (pack_mapped > peak_pack_mapped)
636 peak_pack_mapped = pack_mapped;
637 if (pack_open_windows > peak_pack_open_windows)
638 peak_pack_open_windows = pack_open_windows;
60bb8b14
SP
639 win->next = p->windows;
640 p->windows = win;
641 }
1f688557 642 }
03e79c88
SP
643 if (win != *w_cursor) {
644 win->last_used = pack_used_ctr++;
645 win->inuse_cnt++;
646 *w_cursor = win;
647 }
60bb8b14 648 offset -= win->offset;
03e79c88
SP
649 if (left)
650 *left = win->len - offset;
651 return win->base + offset;
1f688557
JH
652}
653
9d835df2 654struct packed_git *add_packed_git(char *path, int path_len, int local)
1f688557
JH
655{
656 struct stat st;
657 struct packed_git *p;
658 unsigned long idx_size;
659 void *idx_map;
c0bbbb1b 660 unsigned char sha1[20];
1f688557
JH
661
662 if (check_packed_git_idx(path, &idx_size, &idx_map))
663 return NULL;
664
665 /* do we have a corresponding .pack file? */
666 strcpy(path + path_len - 4, ".pack");
667 if (stat(path, &st) || !S_ISREG(st.st_mode)) {
668 munmap(idx_map, idx_size);
669 return NULL;
670 }
671 /* ok, it looks sane as far as we can check without
672 * actually mapping the pack file.
673 */
674 p = xmalloc(sizeof(*p) + path_len + 2);
675 strcpy(p->pack_name, path);
676 p->index_size = idx_size;
677 p->pack_size = st.st_size;
678 p->index_base = idx_map;
679 p->next = NULL;
c41ee586 680 p->windows = NULL;
9bc879c1 681 p->pack_fd = -1;
9d835df2 682 p->pack_local = local;
f4a11066 683 if ((path_len > 44) && !get_sha1_hex(path + path_len - 44, sha1))
e702496e 684 hashcpy(p->sha1, sha1);
1f688557
JH
685 return p;
686}
687
bf592c50 688struct packed_git *parse_pack_index(unsigned char *sha1)
c508df5e
DB
689{
690 char *path = sha1_pack_index_name(sha1);
691 return parse_pack_index_file(sha1, path);
692}
693
2ab141a2 694struct packed_git *parse_pack_index_file(const unsigned char *sha1, char *idx_path)
bf592c50
DB
695{
696 struct packed_git *p;
697 unsigned long idx_size;
698 void *idx_map;
c508df5e 699 char *path;
bf592c50 700
c508df5e 701 if (check_packed_git_idx(idx_path, &idx_size, &idx_map))
bf592c50
DB
702 return NULL;
703
704 path = sha1_pack_name(sha1);
705
706 p = xmalloc(sizeof(*p) + strlen(path) + 2);
707 strcpy(p->pack_name, path);
708 p->index_size = idx_size;
709 p->pack_size = 0;
710 p->index_base = idx_map;
711 p->next = NULL;
c41ee586 712 p->windows = NULL;
9bc879c1 713 p->pack_fd = -1;
e702496e 714 hashcpy(p->sha1, sha1);
bf592c50
DB
715 return p;
716}
717
718void install_packed_git(struct packed_git *pack)
719{
720 pack->next = packed_git;
721 packed_git = pack;
722}
723
9d835df2 724static void prepare_packed_git_one(char *objdir, int local)
1f688557
JH
725{
726 char path[PATH_MAX];
727 int len;
728 DIR *dir;
729 struct dirent *de;
730
731 sprintf(path, "%s/pack", objdir);
732 len = strlen(path);
733 dir = opendir(path);
b5b16990 734 if (!dir) {
26125f6b 735 if (errno != ENOENT)
bd2afde8 736 error("unable to open object pack directory: %s: %s",
26125f6b 737 path, strerror(errno));
1f688557 738 return;
b5b16990 739 }
1f688557
JH
740 path[len++] = '/';
741 while ((de = readdir(dir)) != NULL) {
742 int namelen = strlen(de->d_name);
743 struct packed_git *p;
744
5bb1cda5 745 if (!has_extension(de->d_name, ".idx"))
1f688557
JH
746 continue;
747
748 /* we have .idx. Is it a file we can map? */
749 strcpy(path + len, de->d_name);
86f7780c
JK
750 for (p = packed_git; p; p = p->next) {
751 if (!memcmp(path, p->pack_name, len + namelen - 4))
752 break;
753 }
754 if (p)
755 continue;
9d835df2 756 p = add_packed_git(path, len + namelen, local);
1f688557
JH
757 if (!p)
758 continue;
759 p->next = packed_git;
760 packed_git = p;
761 }
5b35bcd5 762 closedir(dir);
1f688557
JH
763}
764
637cdd9d 765static int prepare_packed_git_run_once = 0;
9a217f2a 766void prepare_packed_git(void)
1f688557 767{
d5a63b99 768 struct alternate_object_database *alt;
1f688557 769
637cdd9d 770 if (prepare_packed_git_run_once)
1f688557 771 return;
9d835df2 772 prepare_packed_git_one(get_object_directory(), 1);
9a217f2a 773 prepare_alt_odb();
d5a63b99 774 for (alt = alt_odb_list; alt; alt = alt->next) {
1494e038 775 alt->name[-1] = 0;
9d835df2 776 prepare_packed_git_one(alt->base, 0);
1494e038 777 alt->name[-1] = '/';
1f688557 778 }
637cdd9d
JK
779 prepare_packed_git_run_once = 1;
780}
781
fc04c412 782void reprepare_packed_git(void)
637cdd9d
JK
783{
784 prepare_packed_git_run_once = 0;
785 prepare_packed_git();
1f688557
JH
786}
787
5d6ccf5c 788int check_sha1_signature(const unsigned char *sha1, void *map, unsigned long size, const char *type)
0fcfd160
LT
789{
790 unsigned char real_sha1[20];
7cfb5f36 791 hash_sha1_file(map, size, type, real_sha1);
a89fccd2 792 return hashcmp(sha1, real_sha1) ? -1 : 0;
0fcfd160
LT
793}
794
bb6b8e4f 795void *map_sha1_file(const unsigned char *sha1, unsigned long *size)
0fcfd160 796{
0fcfd160
LT
797 struct stat st;
798 void *map;
144bde78 799 int fd;
ace1534d
JH
800 char *filename = find_sha1_file(sha1, &st);
801
802 if (!filename) {
ace1534d
JH
803 return NULL;
804 }
0fcfd160 805
144bde78 806 fd = open(filename, O_RDONLY | sha1_file_open_flag);
0fcfd160 807 if (fd < 0) {
144bde78
LT
808 /* See if it works without O_NOATIME */
809 switch (sha1_file_open_flag) {
810 default:
811 fd = open(filename, O_RDONLY);
812 if (fd >= 0)
813 break;
814 /* Fallthrough */
815 case 0:
144bde78
LT
816 return NULL;
817 }
818
1f688557
JH
819 /* If it failed once, it will probably fail again.
820 * Stop using O_NOATIME
821 */
144bde78 822 sha1_file_open_flag = 0;
0fcfd160 823 }
0fcfd160
LT
824 map = mmap(NULL, st.st_size, PROT_READ, MAP_PRIVATE, fd, 0);
825 close(fd);
e35f9824 826 if (map == MAP_FAILED)
0fcfd160
LT
827 return NULL;
828 *size = st.st_size;
829 return map;
830}
831
bb6b8e4f
JH
832int legacy_loose_object(unsigned char *map)
833{
834 unsigned int word;
835
836 /*
837 * Is it a zlib-compressed buffer? If so, the first byte
838 * must be 0x78 (15-bit window size, deflated), and the
839 * first 16-bit word is evenly divisible by 31
840 */
841 word = (map[0] << 8) + map[1];
842 if (map[0] == 0x78 && !(word % 31))
843 return 1;
844 else
845 return 0;
846}
847
72518e9c 848unsigned long unpack_object_header_gently(const unsigned char *buf, unsigned long len, enum object_type *type, unsigned long *sizep)
c4483576 849{
ad1ed5ee 850 unsigned shift;
93821bd9 851 unsigned char c;
93821bd9 852 unsigned long size;
ad1ed5ee
JH
853 unsigned long used = 0;
854
855 c = buf[used++];
856 *type = (c >> 4) & 7;
857 size = c & 15;
858 shift = 4;
859 while (c & 0x80) {
860 if (len <= used)
861 return 0;
862 if (sizeof(long) * 8 <= shift)
863 return 0;
864 c = buf[used++];
865 size += (c & 0x7f) << shift;
866 shift += 7;
867 }
868 *sizep = size;
869 return used;
870}
871
872static int unpack_sha1_header(z_stream *stream, unsigned char *map, unsigned long mapsize, void *buffer, unsigned long bufsiz)
873{
874 unsigned long size, used;
875 static const char valid_loose_object_type[8] = {
876 0, /* OBJ_EXT */
877 1, 1, 1, 1, /* "commit", "tree", "blob", "tag" */
878 0, /* "delta" and others are invalid in a loose object */
93821bd9 879 };
ad1ed5ee 880 enum object_type type;
93821bd9 881
c4483576
LT
882 /* Get the data stream */
883 memset(stream, 0, sizeof(*stream));
884 stream->next_in = map;
885 stream->avail_in = mapsize;
886 stream->next_out = buffer;
93821bd9
LT
887 stream->avail_out = bufsiz;
888
bb6b8e4f 889 if (legacy_loose_object(map)) {
93821bd9
LT
890 inflateInit(stream);
891 return inflate(stream, 0);
892 }
893
ad1ed5ee
JH
894 used = unpack_object_header_gently(map, mapsize, &type, &size);
895 if (!used || !valid_loose_object_type[type])
93821bd9 896 return -1;
ad1ed5ee
JH
897 map += used;
898 mapsize -= used;
93821bd9
LT
899
900 /* Set up the stream for the rest.. */
901 stream->next_in = map;
902 stream->avail_in = mapsize;
c4483576 903 inflateInit(stream);
93821bd9
LT
904
905 /* And generate the fake traditional header */
ad1ed5ee
JH
906 stream->total_out = 1 + snprintf(buffer, bufsiz, "%s %lu",
907 type_names[type], size);
93821bd9 908 return 0;
c4483576
LT
909}
910
6da4016a 911static void *unpack_sha1_rest(z_stream *stream, void *buffer, unsigned long size)
5180cacc
LT
912{
913 int bytes = strlen(buffer) + 1;
d565b341 914 unsigned char *buf = xmalloc(1+size);
93821bd9 915 unsigned long n;
5180cacc 916
93821bd9
LT
917 n = stream->total_out - bytes;
918 if (n > size)
919 n = size;
920 memcpy(buf, (char *) buffer + bytes, n);
921 bytes = n;
5180cacc
LT
922 if (bytes < size) {
923 stream->next_out = buf + bytes;
924 stream->avail_out = size - bytes;
925 while (inflate(stream, Z_FINISH) == Z_OK)
926 /* nothing */;
927 }
928 buf[size] = 0;
929 inflateEnd(stream);
930 return buf;
931}
932
933/*
934 * We used to just use "sscanf()", but that's actually way
935 * too permissive for what we want to check. So do an anal
936 * object header parse by hand.
937 */
38d3874d 938static int parse_sha1_header(char *hdr, char *type, unsigned long *sizep)
5180cacc
LT
939{
940 int i;
941 unsigned long size;
942
943 /*
944 * The type can be at most ten bytes (including the
945 * terminating '\0' that we add), and is followed by
946 * a space.
947 */
948 i = 10;
949 for (;;) {
950 char c = *hdr++;
951 if (c == ' ')
952 break;
953 if (!--i)
954 return -1;
955 *type++ = c;
956 }
957 *type = 0;
958
959 /*
960 * The length must follow immediately, and be in canonical
961 * decimal format (ie "010" is not valid).
962 */
963 size = *hdr++ - '0';
964 if (size > 9)
965 return -1;
966 if (size) {
967 for (;;) {
968 unsigned long c = *hdr - '0';
969 if (c > 9)
970 break;
971 hdr++;
972 size = size * 10 + c;
973 }
974 }
975 *sizep = size;
976
977 /*
978 * The length must be followed by a zero byte
979 */
980 return *hdr ? -1 : 0;
981}
982
0fcfd160
LT
983void * unpack_sha1_file(void *map, unsigned long mapsize, char *type, unsigned long *size)
984{
5180cacc 985 int ret;
0fcfd160 986 z_stream stream;
5180cacc 987 char hdr[8192];
0fcfd160 988
5180cacc
LT
989 ret = unpack_sha1_header(&stream, map, mapsize, hdr, sizeof(hdr));
990 if (ret < Z_OK || parse_sha1_header(hdr, type, size) < 0)
0fcfd160
LT
991 return NULL;
992
5180cacc 993 return unpack_sha1_rest(&stream, hdr, *size);
0fcfd160
LT
994}
995
eb32d236 996static unsigned long get_delta_base(struct packed_git *p,
03e79c88 997 struct pack_window **w_curs,
eb32d236
NP
998 unsigned long offset,
999 enum object_type kind,
1000 unsigned long delta_obj_offset,
1001 unsigned long *base_obj_offset)
1002{
03e79c88 1003 unsigned char *base_info = use_pack(p, w_curs, offset, NULL);
eb32d236
NP
1004 unsigned long base_offset;
1005
8d8a4ea5
SP
1006 /* use_pack() assured us we have [base_info, base_info + 20)
1007 * as a range that we can look at without walking off the
1008 * end of the mapped window. Its actually the hash size
1009 * that is assured. An OFS_DELTA longer than the hash size
1010 * is stupid, as then a REF_DELTA would be smaller to store.
1011 */
eb32d236
NP
1012 if (kind == OBJ_OFS_DELTA) {
1013 unsigned used = 0;
1014 unsigned char c = base_info[used++];
1015 base_offset = c & 127;
1016 while (c & 128) {
1017 base_offset += 1;
1018 if (!base_offset || base_offset & ~(~0UL >> 7))
1019 die("offset value overflow for delta base object");
1020 c = base_info[used++];
1021 base_offset = (base_offset << 7) + (c & 127);
1022 }
1023 base_offset = delta_obj_offset - base_offset;
1024 if (base_offset >= delta_obj_offset)
1025 die("delta base offset out of bound");
1026 offset += used;
1027 } else if (kind == OBJ_REF_DELTA) {
1028 /* The base entry _must_ be in the same pack */
1029 base_offset = find_pack_entry_one(base_info, p);
1030 if (!base_offset)
1031 die("failed to find delta-pack base object %s",
1032 sha1_to_hex(base_info));
1033 offset += 20;
1034 } else
1035 die("I am totally screwed");
1036 *base_obj_offset = base_offset;
1037 return offset;
1038}
1039
f3bf9224 1040/* forward declaration for a mutually recursive function */
43057304 1041static int packed_object_info(struct packed_git *p, unsigned long offset,
f3bf9224
JH
1042 char *type, unsigned long *sizep);
1043
43057304 1044static int packed_delta_info(struct packed_git *p,
03e79c88 1045 struct pack_window **w_curs,
43057304 1046 unsigned long offset,
eb32d236
NP
1047 enum object_type kind,
1048 unsigned long obj_offset,
5db47c2b 1049 char *type,
43057304 1050 unsigned long *sizep)
5db47c2b 1051{
43057304 1052 unsigned long base_offset;
f3bf9224 1053
03e79c88
SP
1054 offset = get_delta_base(p, w_curs, offset, kind,
1055 obj_offset, &base_offset);
f3bf9224 1056
c62266f3
JH
1057 /* We choose to only get the type of the base object and
1058 * ignore potentially corrupt pack file that expects the delta
1059 * based on a base with a wrong size. This saves tons of
1060 * inflate() calls.
1061 */
43057304 1062 if (packed_object_info(p, base_offset, type, NULL))
c62266f3 1063 die("cannot get info for delta-pack base");
5db47c2b 1064
c62266f3
JH
1065 if (sizep) {
1066 const unsigned char *data;
079afb18 1067 unsigned char delta_head[20], *in;
c62266f3
JH
1068 unsigned long result_size;
1069 z_stream stream;
1070 int st;
1071
1072 memset(&stream, 0, sizeof(stream));
c62266f3
JH
1073 stream.next_out = delta_head;
1074 stream.avail_out = sizeof(delta_head);
1075
1076 inflateInit(&stream);
079afb18
SP
1077 do {
1078 in = use_pack(p, w_curs, offset, &stream.avail_in);
1079 stream.next_in = in;
1080 st = inflate(&stream, Z_FINISH);
1081 offset += stream.next_in - in;
1082 } while ((st == Z_OK || st == Z_BUF_ERROR)
1083 && stream.total_out < sizeof(delta_head));
c62266f3
JH
1084 inflateEnd(&stream);
1085 if ((st != Z_STREAM_END) &&
1086 stream.total_out != sizeof(delta_head))
1087 die("delta data unpack-initial failed");
1088
1089 /* Examine the initial part of the delta to figure out
1090 * the result size.
1091 */
1092 data = delta_head;
8960844a
NP
1093
1094 /* ignore base size */
1095 get_delta_hdr_size(&data, delta_head+sizeof(delta_head));
5db47c2b 1096
c62266f3 1097 /* Read the result size */
8960844a 1098 result_size = get_delta_hdr_size(&data, delta_head+sizeof(delta_head));
c62266f3
JH
1099 *sizep = result_size;
1100 }
5db47c2b
JH
1101 return 0;
1102}
1103
03e79c88
SP
1104static unsigned long unpack_object_header(struct packed_git *p,
1105 struct pack_window **w_curs,
1106 unsigned long offset,
1107 enum object_type *type,
1108 unsigned long *sizep)
a733cb60 1109{
03e79c88
SP
1110 unsigned char *base;
1111 unsigned int left;
ad1ed5ee 1112 unsigned long used;
a733cb60 1113
8d8a4ea5
SP
1114 /* use_pack() assures us we have [base, base + 20) available
1115 * as a range that we can look at at. (Its actually the hash
1116 * size that is assurred.) With our object header encoding
1117 * the maximum deflated object size is 2^137, which is just
1118 * insane, so we know won't exceed what we have been given.
1119 */
03e79c88
SP
1120 base = use_pack(p, w_curs, offset, &left);
1121 used = unpack_object_header_gently(base, left, type, sizep);
ad1ed5ee
JH
1122 if (!used)
1123 die("object offset outside of pack file");
1124
1125 return offset + used;
a733cb60
LT
1126}
1127
43057304
NP
1128void packed_object_info_detail(struct packed_git *p,
1129 unsigned long offset,
ad8c80a5
JH
1130 char *type,
1131 unsigned long *size,
1132 unsigned long *store_size,
f8f135c9 1133 unsigned int *delta_chain_length,
ad8c80a5
JH
1134 unsigned char *base_sha1)
1135{
03e79c88 1136 struct pack_window *w_curs = NULL;
eb32d236 1137 unsigned long obj_offset, val;
43057304 1138 unsigned char *next_sha1;
ad8c80a5
JH
1139 enum object_type kind;
1140
43057304 1141 *delta_chain_length = 0;
eb32d236 1142 obj_offset = offset;
03e79c88 1143 offset = unpack_object_header(p, &w_curs, offset, &kind, size);
43057304
NP
1144
1145 for (;;) {
1146 switch (kind) {
1147 default:
08a19d87 1148 die("pack %s contains unknown object type %d",
43057304
NP
1149 p->pack_name, kind);
1150 case OBJ_COMMIT:
1151 case OBJ_TREE:
1152 case OBJ_BLOB:
1153 case OBJ_TAG:
1154 strcpy(type, type_names[kind]);
1155 *store_size = 0; /* notyet */
03e79c88 1156 unuse_pack(&w_curs);
43057304 1157 return;
eb32d236 1158 case OBJ_OFS_DELTA:
03e79c88
SP
1159 get_delta_base(p, &w_curs, offset, kind,
1160 obj_offset, &offset);
eb32d236
NP
1161 if (*delta_chain_length == 0) {
1162 /* TODO: find base_sha1 as pointed by offset */
1163 }
1164 break;
1165 case OBJ_REF_DELTA:
03e79c88 1166 next_sha1 = use_pack(p, &w_curs, offset, NULL);
43057304
NP
1167 if (*delta_chain_length == 0)
1168 hashcpy(base_sha1, next_sha1);
1169 offset = find_pack_entry_one(next_sha1, p);
1170 break;
1171 }
eb32d236 1172 obj_offset = offset;
03e79c88 1173 offset = unpack_object_header(p, &w_curs, offset, &kind, &val);
43057304 1174 (*delta_chain_length)++;
ad8c80a5 1175 }
ad8c80a5
JH
1176}
1177
43057304 1178static int packed_object_info(struct packed_git *p, unsigned long offset,
1f688557
JH
1179 char *type, unsigned long *sizep)
1180{
03e79c88 1181 struct pack_window *w_curs = NULL;
eb32d236 1182 unsigned long size, obj_offset = offset;
a733cb60 1183 enum object_type kind;
03e79c88 1184 int r;
5db47c2b 1185
03e79c88 1186 offset = unpack_object_header(p, &w_curs, offset, &kind, &size);
5db47c2b 1187
a733cb60 1188 switch (kind) {
eb32d236
NP
1189 case OBJ_OFS_DELTA:
1190 case OBJ_REF_DELTA:
03e79c88
SP
1191 r = packed_delta_info(p, &w_curs, offset, kind,
1192 obj_offset, type, sizep);
1193 unuse_pack(&w_curs);
1194 return r;
a733cb60 1195 case OBJ_COMMIT:
a733cb60 1196 case OBJ_TREE:
a733cb60 1197 case OBJ_BLOB:
a733cb60 1198 case OBJ_TAG:
5a18f540 1199 strcpy(type, type_names[kind]);
03e79c88 1200 unuse_pack(&w_curs);
a69d0943 1201 break;
1f688557 1202 default:
08a19d87 1203 die("pack %s contains unknown object type %d",
264b16b6 1204 p->pack_name, kind);
1f688557 1205 }
c62266f3
JH
1206 if (sizep)
1207 *sizep = size;
1f688557
JH
1208 return 0;
1209}
1210
eb950c19 1211static void *unpack_compressed_entry(struct packed_git *p,
03e79c88 1212 struct pack_window **w_curs,
eb950c19
SP
1213 unsigned long offset,
1214 unsigned long size)
de530aaa
SP
1215{
1216 int st;
1217 z_stream stream;
079afb18 1218 unsigned char *buffer, *in;
de530aaa
SP
1219
1220 buffer = xmalloc(size + 1);
1221 buffer[size] = 0;
1222 memset(&stream, 0, sizeof(stream));
de530aaa
SP
1223 stream.next_out = buffer;
1224 stream.avail_out = size;
1225
1226 inflateInit(&stream);
079afb18
SP
1227 do {
1228 in = use_pack(p, w_curs, offset, &stream.avail_in);
1229 stream.next_in = in;
1230 st = inflate(&stream, Z_FINISH);
1231 offset += stream.next_in - in;
1232 } while (st == Z_OK || st == Z_BUF_ERROR);
de530aaa
SP
1233 inflateEnd(&stream);
1234 if ((st != Z_STREAM_END) || stream.total_out != size) {
1235 free(buffer);
1236 return NULL;
1237 }
1238
1239 return buffer;
1240}
1241
eb950c19 1242static void *unpack_delta_entry(struct packed_git *p,
03e79c88 1243 struct pack_window **w_curs,
eb950c19 1244 unsigned long offset,
1f688557 1245 unsigned long delta_size,
eb32d236
NP
1246 enum object_type kind,
1247 unsigned long obj_offset,
1f688557 1248 char *type,
eb950c19 1249 unsigned long *sizep)
1f688557 1250{
7c3e8be3 1251 void *delta_data, *result, *base;
43057304 1252 unsigned long result_size, base_size, base_offset;
43057304 1253
03e79c88
SP
1254 offset = get_delta_base(p, w_curs, offset, kind,
1255 obj_offset, &base_offset);
4d703a1a 1256 base = unpack_entry(p, base_offset, type, &base_size);
67686d95 1257 if (!base)
43057304
NP
1258 die("failed to read delta base object at %lu from %s",
1259 base_offset, p->pack_name);
67686d95 1260
03e79c88 1261 delta_data = unpack_compressed_entry(p, w_curs, offset, delta_size);
1f688557
JH
1262 result = patch_delta(base, base_size,
1263 delta_data, delta_size,
1264 &result_size);
1265 if (!result)
1266 die("failed to apply delta");
1267 free(delta_data);
1268 free(base);
1269 *sizep = result_size;
1270 return result;
1271}
1272
4d703a1a 1273void *unpack_entry(struct packed_git *p, unsigned long offset,
1f688557
JH
1274 char *type, unsigned long *sizep)
1275{
03e79c88 1276 struct pack_window *w_curs = NULL;
4d703a1a
SP
1277 unsigned long size, obj_offset = offset;
1278 enum object_type kind;
f9253394 1279 void *retval;
1f688557 1280
03e79c88 1281 offset = unpack_object_header(p, &w_curs, offset, &kind, &size);
a733cb60 1282 switch (kind) {
eb32d236
NP
1283 case OBJ_OFS_DELTA:
1284 case OBJ_REF_DELTA:
03e79c88
SP
1285 retval = unpack_delta_entry(p, &w_curs, offset, size,
1286 kind, obj_offset, type, sizep);
4d703a1a 1287 break;
a733cb60 1288 case OBJ_COMMIT:
a733cb60 1289 case OBJ_TREE:
a733cb60 1290 case OBJ_BLOB:
a733cb60 1291 case OBJ_TAG:
5a18f540
SP
1292 strcpy(type, type_names[kind]);
1293 *sizep = size;
03e79c88 1294 retval = unpack_compressed_entry(p, &w_curs, offset, size);
4d703a1a 1295 break;
1f688557 1296 default:
4d703a1a 1297 die("unknown object type %i in %s", kind, p->pack_name);
1f688557 1298 }
03e79c88 1299 unuse_pack(&w_curs);
4d703a1a 1300 return retval;
1f688557
JH
1301}
1302
9a217f2a
JH
1303int num_packed_objects(const struct packed_git *p)
1304{
f9253394 1305 /* See check_packed_git_idx() */
9a217f2a
JH
1306 return (p->index_size - 20 - 20 - 4*256) / 24;
1307}
1308
1309int nth_packed_object_sha1(const struct packed_git *p, int n,
1310 unsigned char* sha1)
1311{
1312 void *index = p->index_base + 256;
1313 if (n < 0 || num_packed_objects(p) <= n)
1314 return -1;
e702496e 1315 hashcpy(sha1, (unsigned char *) index + (24 * n) + 4);
9a217f2a
JH
1316 return 0;
1317}
1318
43057304
NP
1319unsigned long find_pack_entry_one(const unsigned char *sha1,
1320 struct packed_git *p)
1f688557 1321{
4d235c80 1322 unsigned int *level1_ofs = p->index_base;
1f688557
JH
1323 int hi = ntohl(level1_ofs[*sha1]);
1324 int lo = ((*sha1 == 0x0) ? 0 : ntohl(level1_ofs[*sha1 - 1]));
1325 void *index = p->index_base + 256;
1326
1327 do {
1328 int mi = (lo + hi) / 2;
a89fccd2 1329 int cmp = hashcmp((unsigned char *)index + (24 * mi) + 4, sha1);
43057304
NP
1330 if (!cmp)
1331 return ntohl(*((unsigned int *) ((char *) index + (24 * mi))));
1f688557
JH
1332 if (cmp > 0)
1333 hi = mi;
1334 else
1335 lo = mi+1;
1336 } while (lo < hi);
1337 return 0;
1338}
1339
d4ff6d92
SP
1340static int matches_pack_name(struct packed_git *p, const char *ig)
1341{
1342 const char *last_c, *c;
1343
1344 if (!strcmp(p->pack_name, ig))
1345 return 0;
1346
1347 for (c = p->pack_name, last_c = c; *c;)
1348 if (*c == '/')
1349 last_c = ++c;
1350 else
1351 ++c;
1352 if (!strcmp(last_c, ig))
1353 return 0;
1354
1355 return 1;
1356}
1357
106d710b 1358static int find_pack_entry(const unsigned char *sha1, struct pack_entry *e, const char **ignore_packed)
1f688557
JH
1359{
1360 struct packed_git *p;
43057304
NP
1361 unsigned long offset;
1362
1f688557
JH
1363 prepare_packed_git();
1364
1365 for (p = packed_git; p; p = p->next) {
106d710b
JH
1366 if (ignore_packed) {
1367 const char **ig;
1368 for (ig = ignore_packed; *ig; ig++)
d4ff6d92 1369 if (!matches_pack_name(p, *ig))
106d710b
JH
1370 break;
1371 if (*ig)
1372 continue;
1373 }
43057304
NP
1374 offset = find_pack_entry_one(sha1, p);
1375 if (offset) {
1376 e->offset = offset;
1377 e->p = p;
1378 hashcpy(e->sha1, sha1);
1f688557 1379 return 1;
43057304 1380 }
1f688557
JH
1381 }
1382 return 0;
1383}
1384
bf592c50
DB
1385struct packed_git *find_sha1_pack(const unsigned char *sha1,
1386 struct packed_git *packs)
1387{
1388 struct packed_git *p;
bf592c50
DB
1389
1390 for (p = packs; p; p = p->next) {
43057304 1391 if (find_pack_entry_one(sha1, p))
bf592c50
DB
1392 return p;
1393 }
1394 return NULL;
1395
1396}
1397
f0df4ed5 1398static int sha1_loose_object_info(const unsigned char *sha1, char *type, unsigned long *sizep)
65c2e0c3 1399{
36e4d74a 1400 int status;
65c2e0c3
JH
1401 unsigned long mapsize, size;
1402 void *map;
1403 z_stream stream;
36e4d74a 1404 char hdr[128];
65c2e0c3 1405
bb6b8e4f 1406 map = map_sha1_file(sha1, &mapsize);
f0df4ed5
JS
1407 if (!map)
1408 return error("unable to find %s", sha1_to_hex(sha1));
36e4d74a
JH
1409 if (unpack_sha1_header(&stream, map, mapsize, hdr, sizeof(hdr)) < 0)
1410 status = error("unable to unpack %s header",
1411 sha1_to_hex(sha1));
1412 if (parse_sha1_header(hdr, type, &size) < 0)
1413 status = error("unable to parse %s header", sha1_to_hex(sha1));
c4584ae3 1414 else {
65c2e0c3 1415 status = 0;
c62266f3
JH
1416 if (sizep)
1417 *sizep = size;
65c2e0c3 1418 }
65c2e0c3
JH
1419 inflateEnd(&stream);
1420 munmap(map, mapsize);
1421 return status;
1422}
1423
f0df4ed5
JS
1424int sha1_object_info(const unsigned char *sha1, char *type, unsigned long *sizep)
1425{
f0df4ed5
JS
1426 struct pack_entry e;
1427
1428 if (!find_pack_entry(sha1, &e, NULL)) {
1429 reprepare_packed_git();
1430 if (!find_pack_entry(sha1, &e, NULL))
1431 return sha1_loose_object_info(sha1, type, sizep);
1432 }
03e79c88 1433 return packed_object_info(e.p, e.offset, type, sizep);
f0df4ed5
JS
1434}
1435
1f688557
JH
1436static void *read_packed_sha1(const unsigned char *sha1, char *type, unsigned long *size)
1437{
1438 struct pack_entry e;
1439
106d710b 1440 if (!find_pack_entry(sha1, &e, NULL)) {
1f688557
JH
1441 error("cannot read sha1_file for %s", sha1_to_hex(sha1));
1442 return NULL;
1443 }
4d703a1a 1444 return unpack_entry(e.p, e.offset, type, size);
1f688557
JH
1445}
1446
0fcfd160
LT
1447void * read_sha1_file(const unsigned char *sha1, char *type, unsigned long *size)
1448{
1449 unsigned long mapsize;
1450 void *map, *buf;
ab90ea5d 1451 struct pack_entry e;
0fcfd160 1452
106d710b 1453 if (find_pack_entry(sha1, &e, NULL))
ab90ea5d 1454 return read_packed_sha1(sha1, type, size);
bb6b8e4f 1455 map = map_sha1_file(sha1, &mapsize);
0fcfd160
LT
1456 if (map) {
1457 buf = unpack_sha1_file(map, mapsize, type, size);
1458 munmap(map, mapsize);
1459 return buf;
1460 }
637cdd9d 1461 reprepare_packed_git();
106d710b 1462 if (find_pack_entry(sha1, &e, NULL))
637cdd9d 1463 return read_packed_sha1(sha1, type, size);
ab90ea5d 1464 return NULL;
0fcfd160
LT
1465}
1466
40469ee9 1467void *read_object_with_reference(const unsigned char *sha1,
bf0f910d 1468 const char *required_type,
40469ee9
JH
1469 unsigned long *size,
1470 unsigned char *actual_sha1_return)
f4913f91
JH
1471{
1472 char type[20];
1473 void *buffer;
1474 unsigned long isize;
40469ee9 1475 unsigned char actual_sha1[20];
f4913f91 1476
e702496e 1477 hashcpy(actual_sha1, sha1);
40469ee9
JH
1478 while (1) {
1479 int ref_length = -1;
1480 const char *ref_type = NULL;
f4913f91 1481
40469ee9
JH
1482 buffer = read_sha1_file(actual_sha1, type, &isize);
1483 if (!buffer)
1484 return NULL;
1485 if (!strcmp(type, required_type)) {
1486 *size = isize;
1487 if (actual_sha1_return)
e702496e 1488 hashcpy(actual_sha1_return, actual_sha1);
40469ee9
JH
1489 return buffer;
1490 }
1491 /* Handle references */
8e440259 1492 else if (!strcmp(type, commit_type))
40469ee9 1493 ref_type = "tree ";
8e440259 1494 else if (!strcmp(type, tag_type))
40469ee9
JH
1495 ref_type = "object ";
1496 else {
1497 free(buffer);
1498 return NULL;
1499 }
1500 ref_length = strlen(ref_type);
f4913f91 1501
40469ee9 1502 if (memcmp(buffer, ref_type, ref_length) ||
1d7f171c 1503 get_sha1_hex((char *) buffer + ref_length, actual_sha1)) {
40469ee9
JH
1504 free(buffer);
1505 return NULL;
1506 }
1cf58e72 1507 free(buffer);
40469ee9
JH
1508 /* Now we have the ID of the referred-to object in
1509 * actual_sha1. Check again. */
f4913f91 1510 }
f4913f91
JH
1511}
1512
972a9155
RS
1513static void write_sha1_file_prepare(void *buf, unsigned long len,
1514 const char *type, unsigned char *sha1,
1515 unsigned char *hdr, int *hdrlen)
d410c0f5
JH
1516{
1517 SHA_CTX c;
1518
1519 /* Generate the header */
1520 *hdrlen = sprintf((char *)hdr, "%s %lu", type, len)+1;
1521
1522 /* Sha1.. */
1523 SHA1_Init(&c);
1524 SHA1_Update(&c, hdr, *hdrlen);
1525 SHA1_Update(&c, buf, len);
1526 SHA1_Final(sha1, &c);
d410c0f5
JH
1527}
1528
230f1322
LT
1529/*
1530 * Link the tempfile to the final place, possibly creating the
1531 * last directory level as you do so.
1532 *
1533 * Returns the errno on failure, 0 on success.
1534 */
839837b9 1535static int link_temp_to_file(const char *tmpfile, const char *filename)
230f1322
LT
1536{
1537 int ret;
756aaf4a 1538 char *dir;
230f1322
LT
1539
1540 if (!link(tmpfile, filename))
1541 return 0;
1542
1543 /*
756aaf4a 1544 * Try to mkdir the last path component if that failed.
230f1322
LT
1545 *
1546 * Re-try the "link()" regardless of whether the mkdir
1547 * succeeds, since a race might mean that somebody
1548 * else succeeded.
1549 */
1550 ret = errno;
756aaf4a
SP
1551 dir = strrchr(filename, '/');
1552 if (dir) {
1553 *dir = 0;
866cae0d 1554 if (!mkdir(filename, 0777) && adjust_shared_perm(filename)) {
91c23e48 1555 *dir = '/';
756aaf4a 1556 return -2;
91c23e48 1557 }
756aaf4a
SP
1558 *dir = '/';
1559 if (!link(tmpfile, filename))
1560 return 0;
1561 ret = errno;
230f1322
LT
1562 }
1563 return ret;
1564}
1565
1566/*
1567 * Move the just written object into its final resting place
1568 */
839837b9 1569int move_temp_to_file(const char *tmpfile, const char *filename)
230f1322
LT
1570{
1571 int ret = link_temp_to_file(tmpfile, filename);
7ebb6fca
LT
1572
1573 /*
1574 * Coda hack - coda doesn't like cross-directory links,
1575 * so we fall back to a rename, which will mean that it
1576 * won't be able to check collisions, but that's not a
1577 * big deal.
1578 *
1579 * The same holds for FAT formatted media.
1580 *
1581 * When this succeeds, we just return 0. We have nothing
1582 * left to unlink.
1583 */
1584 if (ret && ret != EEXIST) {
1585 if (!rename(tmpfile, filename))
230f1322 1586 return 0;
9e48b389 1587 ret = errno;
230f1322
LT
1588 }
1589 unlink(tmpfile);
1590 if (ret) {
1591 if (ret != EEXIST) {
916d081b 1592 return error("unable to write sha1 filename %s: %s\n", filename, strerror(ret));
230f1322
LT
1593 }
1594 /* FIXME!!! Collision check here ? */
1595 }
1596
1597 return 0;
1598}
1599
4d548150
LT
1600static int write_buffer(int fd, const void *buf, size_t len)
1601{
1602 while (len) {
1603 ssize_t size;
1604
1605 size = write(fd, buf, len);
1606 if (!size)
1607 return error("file write: disk full");
1608 if (size < 0) {
1609 if (errno == EINTR || errno == EAGAIN)
1610 continue;
1611 return error("file write error (%s)", strerror(errno));
1612 }
1613 len -= size;
1d7f171c 1614 buf = (char *) buf + size;
4d548150
LT
1615 }
1616 return 0;
1617}
1618
93821bd9
LT
1619static int write_binary_header(unsigned char *hdr, enum object_type type, unsigned long len)
1620{
1621 int hdr_len;
1622 unsigned char c;
1623
1624 c = (type << 4) | (len & 15);
1625 len >>= 4;
1626 hdr_len = 1;
1627 while (len) {
1628 *hdr++ = c | 0x80;
1629 hdr_len++;
1630 c = (len & 0x7f);
1631 len >>= 7;
1632 }
1633 *hdr = c;
1634 return hdr_len;
1635}
1636
1637static void setup_object_header(z_stream *stream, const char *type, unsigned long len)
1638{
1639 int obj_type, hdr;
1640
1641 if (use_legacy_headers) {
1642 while (deflate(stream, 0) == Z_OK)
1643 /* nothing */;
1644 return;
1645 }
1646 if (!strcmp(type, blob_type))
1647 obj_type = OBJ_BLOB;
1648 else if (!strcmp(type, tree_type))
1649 obj_type = OBJ_TREE;
1650 else if (!strcmp(type, commit_type))
1651 obj_type = OBJ_COMMIT;
1652 else if (!strcmp(type, tag_type))
1653 obj_type = OBJ_TAG;
1654 else
1655 die("trying to generate bogus object of type '%s'", type);
1656 hdr = write_binary_header(stream->next_out, obj_type, len);
1657 stream->total_out = hdr;
1658 stream->next_out += hdr;
1659 stream->avail_out -= hdr;
1660}
1661
abdc3fc8
RS
1662int hash_sha1_file(void *buf, unsigned long len, const char *type,
1663 unsigned char *sha1)
1664{
1665 unsigned char hdr[50];
1666 int hdrlen;
1667 write_sha1_file_prepare(buf, len, type, sha1, hdr, &hdrlen);
1668 return 0;
1669}
1670
bf0f910d 1671int write_sha1_file(void *buf, unsigned long len, const char *type, unsigned char *returnsha1)
0fcfd160
LT
1672{
1673 int size;
bf0f910d 1674 unsigned char *compressed;
0fcfd160
LT
1675 z_stream stream;
1676 unsigned char sha1[20];
706bc531 1677 char *filename;
aac17941 1678 static char tmpfile[PATH_MAX];
bf0f910d 1679 unsigned char hdr[50];
230f1322 1680 int fd, hdrlen;
a44c9a5e 1681
d410c0f5
JH
1682 /* Normally if we have it in the pack then we do not bother writing
1683 * it out into .git/objects/??/?{38} file.
1684 */
972a9155
RS
1685 write_sha1_file_prepare(buf, len, type, sha1, hdr, &hdrlen);
1686 filename = sha1_file_name(sha1);
706bc531 1687 if (returnsha1)
e702496e 1688 hashcpy(returnsha1, sha1);
d410c0f5
JH
1689 if (has_sha1_file(sha1))
1690 return 0;
aac17941
LT
1691 fd = open(filename, O_RDONLY);
1692 if (fd >= 0) {
706bc531 1693 /*
aac17941
LT
1694 * FIXME!!! We might do collision checking here, but we'd
1695 * need to uncompress the old file and check it. Later.
706bc531 1696 */
aac17941 1697 close(fd);
706bc531
LT
1698 return 0;
1699 }
1700
aac17941 1701 if (errno != ENOENT) {
916d081b 1702 return error("sha1 file %s: %s\n", filename, strerror(errno));
aac17941
LT
1703 }
1704
1705 snprintf(tmpfile, sizeof(tmpfile), "%s/obj_XXXXXX", get_object_directory());
ace1534d 1706
aac17941
LT
1707 fd = mkstemp(tmpfile);
1708 if (fd < 0) {
916d081b
PB
1709 if (errno == EPERM)
1710 return error("insufficient permission for adding an object to repository database %s\n", get_object_directory());
1711 else
1712 return error("unable to create temporary sha1 filename %s: %s\n", tmpfile, strerror(errno));
aac17941
LT
1713 }
1714
0fcfd160
LT
1715 /* Set it up */
1716 memset(&stream, 0, sizeof(stream));
12f6c308 1717 deflateInit(&stream, zlib_compression_level);
93821bd9 1718 size = 8 + deflateBound(&stream, len+hdrlen);
812666c8 1719 compressed = xmalloc(size);
0fcfd160
LT
1720
1721 /* Compress it */
0fcfd160
LT
1722 stream.next_out = compressed;
1723 stream.avail_out = size;
a44c9a5e
LT
1724
1725 /* First header.. */
1726 stream.next_in = hdr;
1727 stream.avail_in = hdrlen;
93821bd9 1728 setup_object_header(&stream, type, len);
a44c9a5e
LT
1729
1730 /* Then the data itself.. */
1731 stream.next_in = buf;
1732 stream.avail_in = len;
0fcfd160
LT
1733 while (deflate(&stream, Z_FINISH) == Z_OK)
1734 /* nothing */;
1735 deflateEnd(&stream);
1736 size = stream.total_out;
1737
4d548150
LT
1738 if (write_buffer(fd, compressed, size) < 0)
1739 die("unable to write sha1 file");
aac17941 1740 fchmod(fd, 0444);
706bc531 1741 close(fd);
383f85b7 1742 free(compressed);
0fcfd160 1743
230f1322 1744 return move_temp_to_file(tmpfile, filename);
0fcfd160 1745}
8237b185 1746
4d548150
LT
1747/*
1748 * We need to unpack and recompress the object for writing
1749 * it out to a different file.
1750 */
1751static void *repack_object(const unsigned char *sha1, unsigned long *objsize)
a5eda52b 1752{
4d548150 1753 size_t size;
a5eda52b 1754 z_stream stream;
4d548150
LT
1755 unsigned char *unpacked;
1756 unsigned long len;
1757 char type[20];
1758 char hdr[50];
1759 int hdrlen;
1760 void *buf;
bfc66daf 1761
a9486b02 1762 /* need to unpack and recompress it by itself */
4d548150 1763 unpacked = read_packed_sha1(sha1, type, &len);
a5eda52b 1764
4d548150 1765 hdrlen = sprintf(hdr, "%s %lu", type, len) + 1;
a5eda52b 1766
4d548150
LT
1767 /* Set it up */
1768 memset(&stream, 0, sizeof(stream));
12f6c308 1769 deflateInit(&stream, zlib_compression_level);
4d548150
LT
1770 size = deflateBound(&stream, len + hdrlen);
1771 buf = xmalloc(size);
a5eda52b 1772
4d548150
LT
1773 /* Compress it */
1774 stream.next_out = buf;
1775 stream.avail_out = size;
a5eda52b 1776
4d548150
LT
1777 /* First header.. */
1778 stream.next_in = (void *)hdr;
1779 stream.avail_in = hdrlen;
1780 while (deflate(&stream, 0) == Z_OK)
1781 /* nothing */;
bfc66daf 1782
4d548150
LT
1783 /* Then the data itself.. */
1784 stream.next_in = unpacked;
1785 stream.avail_in = len;
1786 while (deflate(&stream, Z_FINISH) == Z_OK)
1787 /* nothing */;
1788 deflateEnd(&stream);
1789 free(unpacked);
bfc66daf 1790
4d548150
LT
1791 *objsize = stream.total_out;
1792 return buf;
1793}
1794
1795int write_sha1_to_fd(int fd, const unsigned char *sha1)
1796{
1797 int retval;
1798 unsigned long objsize;
bb6b8e4f 1799 void *buf = map_sha1_file(sha1, &objsize);
4d548150
LT
1800
1801 if (buf) {
1802 retval = write_buffer(fd, buf, objsize);
1803 munmap(buf, objsize);
1804 return retval;
1805 }
1806
1807 buf = repack_object(sha1, &objsize);
1808 retval = write_buffer(fd, buf, objsize);
1809 free(buf);
1810 return retval;
a5eda52b
DB
1811}
1812
70b9829e
DB
1813int write_sha1_from_fd(const unsigned char *sha1, int fd, char *buffer,
1814 size_t bufsize, size_t *bufposn)
8237b185 1815{
230f1322 1816 char tmpfile[PATH_MAX];
8237b185
DB
1817 int local;
1818 z_stream stream;
1819 unsigned char real_sha1[20];
bf0f910d 1820 unsigned char discard[4096];
8237b185
DB
1821 int ret;
1822 SHA_CTX c;
1823
230f1322 1824 snprintf(tmpfile, sizeof(tmpfile), "%s/obj_XXXXXX", get_object_directory());
8237b185 1825
230f1322 1826 local = mkstemp(tmpfile);
916d081b
PB
1827 if (local < 0) {
1828 if (errno == EPERM)
1829 return error("insufficient permission for adding an object to repository database %s\n", get_object_directory());
1830 else
1831 return error("unable to create temporary sha1 filename %s: %s\n", tmpfile, strerror(errno));
1832 }
8237b185
DB
1833
1834 memset(&stream, 0, sizeof(stream));
1835
1836 inflateInit(&stream);
1837
1838 SHA1_Init(&c);
1839
1840 do {
1841 ssize_t size;
70b9829e
DB
1842 if (*bufposn) {
1843 stream.avail_in = *bufposn;
96ad15ae 1844 stream.next_in = (unsigned char *) buffer;
70b9829e
DB
1845 do {
1846 stream.next_out = discard;
1847 stream.avail_out = sizeof(discard);
1848 ret = inflate(&stream, Z_SYNC_FLUSH);
1849 SHA1_Update(&c, discard, sizeof(discard) -
1850 stream.avail_out);
1851 } while (stream.avail_in && ret == Z_OK);
4d548150
LT
1852 if (write_buffer(local, buffer, *bufposn - stream.avail_in) < 0)
1853 die("unable to write sha1 file");
70b9829e
DB
1854 memmove(buffer, buffer + *bufposn - stream.avail_in,
1855 stream.avail_in);
1856 *bufposn = stream.avail_in;
1857 if (ret != Z_OK)
1858 break;
1859 }
1860 size = read(fd, buffer + *bufposn, bufsize - *bufposn);
8237b185
DB
1861 if (size <= 0) {
1862 close(local);
230f1322 1863 unlink(tmpfile);
8237b185
DB
1864 if (!size)
1865 return error("Connection closed?");
1866 perror("Reading from connection");
1867 return -1;
1868 }
70b9829e
DB
1869 *bufposn += size;
1870 } while (1);
8237b185
DB
1871 inflateEnd(&stream);
1872
1873 close(local);
1874 SHA1_Final(real_sha1, &c);
1875 if (ret != Z_STREAM_END) {
230f1322 1876 unlink(tmpfile);
8237b185
DB
1877 return error("File %s corrupted", sha1_to_hex(sha1));
1878 }
a89fccd2 1879 if (hashcmp(sha1, real_sha1)) {
230f1322 1880 unlink(tmpfile);
bd2afde8 1881 return error("File %s has bad hash", sha1_to_hex(sha1));
8237b185 1882 }
230f1322
LT
1883
1884 return move_temp_to_file(tmpfile, sha1_file_name(sha1));
8237b185
DB
1885}
1886
bf592c50
DB
1887int has_pack_index(const unsigned char *sha1)
1888{
1889 struct stat st;
1890 if (stat(sha1_pack_index_name(sha1), &st))
1891 return 0;
1892 return 1;
1893}
1894
1895int has_pack_file(const unsigned char *sha1)
1896{
1897 struct stat st;
1898 if (stat(sha1_pack_name(sha1), &st))
1899 return 0;
1900 return 1;
1901}
1902
106d710b 1903int has_sha1_pack(const unsigned char *sha1, const char **ignore_packed)
dade09c2
LT
1904{
1905 struct pack_entry e;
106d710b 1906 return find_pack_entry(sha1, &e, ignore_packed);
dade09c2
LT
1907}
1908
8237b185
DB
1909int has_sha1_file(const unsigned char *sha1)
1910{
8237b185 1911 struct stat st;
1f688557
JH
1912 struct pack_entry e;
1913
106d710b 1914 if (find_pack_entry(sha1, &e, NULL))
1f688557 1915 return 1;
ab90ea5d 1916 return find_sha1_file(sha1, &st) ? 1 : 0;
8237b185 1917}
74400e71 1918
e7332f96
BE
1919/*
1920 * reads from fd as long as possible into a supplied buffer of size bytes.
82e5a82f 1921 * If necessary the buffer's size is increased using realloc()
e7332f96
BE
1922 *
1923 * returns 0 if anything went fine and -1 otherwise
1924 *
1925 * NOTE: both buf and size may change, but even when -1 is returned
1926 * you still have to free() it yourself.
1927 */
1928int read_pipe(int fd, char** return_buf, unsigned long* return_size)
024510c8 1929{
e7332f96
BE
1930 char* buf = *return_buf;
1931 unsigned long size = *return_size;
1932 int iret;
024510c8 1933 unsigned long off = 0;
e7332f96 1934
024510c8 1935 do {
e7332f96 1936 iret = xread(fd, buf + off, size - off);
024510c8
DB
1937 if (iret > 0) {
1938 off += iret;
1939 if (off == size) {
1940 size *= 2;
83572c1a 1941 buf = xrealloc(buf, size);
024510c8
DB
1942 }
1943 }
1944 } while (iret > 0);
e7332f96
BE
1945
1946 *return_buf = buf;
1947 *return_size = off;
1948
1949 if (iret < 0)
1950 return -1;
1951 return 0;
1952}
1953
1954int index_pipe(unsigned char *sha1, int fd, const char *type, int write_object)
1955{
1956 unsigned long size = 4096;
2d7320d0 1957 char *buf = xmalloc(size);
e7332f96 1958 int ret;
e7332f96
BE
1959
1960 if (read_pipe(fd, &buf, &size)) {
024510c8
DB
1961 free(buf);
1962 return -1;
1963 }
e7332f96 1964
024510c8 1965 if (!type)
8e440259 1966 type = blob_type;
024510c8 1967 if (write_object)
e7332f96 1968 ret = write_sha1_file(buf, size, type, sha1);
abdc3fc8
RS
1969 else
1970 ret = hash_sha1_file(buf, size, type, sha1);
024510c8
DB
1971 free(buf);
1972 return ret;
1973}
1974
7672db20 1975int index_fd(unsigned char *sha1, int fd, struct stat *st, int write_object, const char *type)
74400e71 1976{
74400e71 1977 unsigned long size = st->st_size;
aac17941
LT
1978 void *buf;
1979 int ret;
74400e71 1980
aac17941 1981 buf = "";
74400e71 1982 if (size)
aac17941 1983 buf = mmap(NULL, size, PROT_READ, MAP_PRIVATE, fd, 0);
74400e71 1984 close(fd);
e35f9824 1985 if (buf == MAP_FAILED)
74400e71
JH
1986 return -1;
1987
7672db20 1988 if (!type)
8e440259 1989 type = blob_type;
7672db20
BL
1990 if (write_object)
1991 ret = write_sha1_file(buf, size, type, sha1);
abdc3fc8
RS
1992 else
1993 ret = hash_sha1_file(buf, size, type, sha1);
aac17941
LT
1994 if (size)
1995 munmap(buf, size);
1996 return ret;
74400e71 1997}
ec1fcc16
JH
1998
1999int index_path(unsigned char *sha1, const char *path, struct stat *st, int write_object)
2000{
2001 int fd;
2002 char *target;
2003
2004 switch (st->st_mode & S_IFMT) {
2005 case S_IFREG:
2006 fd = open(path, O_RDONLY);
2007 if (fd < 0)
2008 return error("open(\"%s\"): %s", path,
2009 strerror(errno));
2010 if (index_fd(sha1, fd, st, write_object, NULL) < 0)
2011 return error("%s: failed to insert into database",
2012 path);
2013 break;
2014 case S_IFLNK:
2015 target = xmalloc(st->st_size+1);
2016 if (readlink(path, target, st->st_size+1) != st->st_size) {
2017 char *errstr = strerror(errno);
2018 free(target);
2019 return error("readlink(\"%s\"): %s", path,
2020 errstr);
2021 }
abdc3fc8
RS
2022 if (!write_object)
2023 hash_sha1_file(target, st->st_size, blob_type, sha1);
2024 else if (write_sha1_file(target, st->st_size, blob_type, sha1))
ec1fcc16
JH
2025 return error("%s: failed to insert into database",
2026 path);
2027 free(target);
2028 break;
2029 default:
2030 return error("%s: unsupported file type", path);
2031 }
2032 return 0;
2033}