Documentation/config.txt: Document config file syntax better
[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
e05db0fd
PR
25#ifdef NO_C99_FORMAT
26#define SZ_FMT "lu"
27#else
28#define SZ_FMT "zu"
29#endif
30
96f1e58f 31const unsigned char null_sha1[20];
88cd621d 32
144bde78
LT
33static unsigned int sha1_file_open_flag = O_NOATIME;
34
e49521b5
JH
35signed char hexval_table[256] = {
36 -1, -1, -1, -1, -1, -1, -1, -1, /* 00-07 */
37 -1, -1, -1, -1, -1, -1, -1, -1, /* 08-0f */
38 -1, -1, -1, -1, -1, -1, -1, -1, /* 10-17 */
39 -1, -1, -1, -1, -1, -1, -1, -1, /* 18-1f */
40 -1, -1, -1, -1, -1, -1, -1, -1, /* 20-27 */
41 -1, -1, -1, -1, -1, -1, -1, -1, /* 28-2f */
42 0, 1, 2, 3, 4, 5, 6, 7, /* 30-37 */
43 8, 9, -1, -1, -1, -1, -1, -1, /* 38-3f */
44 -1, 10, 11, 12, 13, 14, 15, -1, /* 40-47 */
45 -1, -1, -1, -1, -1, -1, -1, -1, /* 48-4f */
46 -1, -1, -1, -1, -1, -1, -1, -1, /* 50-57 */
47 -1, -1, -1, -1, -1, -1, -1, -1, /* 58-5f */
48 -1, 10, 11, 12, 13, 14, 15, -1, /* 60-67 */
49 -1, -1, -1, -1, -1, -1, -1, -1, /* 68-67 */
50 -1, -1, -1, -1, -1, -1, -1, -1, /* 70-77 */
51 -1, -1, -1, -1, -1, -1, -1, -1, /* 78-7f */
52 -1, -1, -1, -1, -1, -1, -1, -1, /* 80-87 */
53 -1, -1, -1, -1, -1, -1, -1, -1, /* 88-8f */
54 -1, -1, -1, -1, -1, -1, -1, -1, /* 90-97 */
55 -1, -1, -1, -1, -1, -1, -1, -1, /* 98-9f */
56 -1, -1, -1, -1, -1, -1, -1, -1, /* a0-a7 */
57 -1, -1, -1, -1, -1, -1, -1, -1, /* a8-af */
58 -1, -1, -1, -1, -1, -1, -1, -1, /* b0-b7 */
59 -1, -1, -1, -1, -1, -1, -1, -1, /* b8-bf */
60 -1, -1, -1, -1, -1, -1, -1, -1, /* c0-c7 */
61 -1, -1, -1, -1, -1, -1, -1, -1, /* c8-cf */
62 -1, -1, -1, -1, -1, -1, -1, -1, /* d0-d7 */
63 -1, -1, -1, -1, -1, -1, -1, -1, /* d8-df */
64 -1, -1, -1, -1, -1, -1, -1, -1, /* e0-e7 */
65 -1, -1, -1, -1, -1, -1, -1, -1, /* e8-ef */
66 -1, -1, -1, -1, -1, -1, -1, -1, /* f0-f7 */
67 -1, -1, -1, -1, -1, -1, -1, -1, /* f8-ff */
68};
0fcfd160
LT
69
70int get_sha1_hex(const char *hex, unsigned char *sha1)
71{
72 int i;
73 for (i = 0; i < 20; i++) {
74 unsigned int val = (hexval(hex[0]) << 4) | hexval(hex[1]);
75 if (val & ~0xff)
76 return -1;
77 *sha1++ = val;
78 hex += 2;
79 }
80 return 0;
81}
82
b2cb9425
JH
83int safe_create_leading_directories(char *path)
84{
85 char *pos = path;
67d42212
JR
86 struct stat st;
87
67ffdf4c
JS
88 if (*pos == '/')
89 pos++;
b2cb9425
JH
90
91 while (pos) {
92 pos = strchr(pos, '/');
93 if (!pos)
94 break;
95 *pos = 0;
67d42212
JR
96 if (!stat(path, &st)) {
97 /* path exists */
98 if (!S_ISDIR(st.st_mode)) {
b2cb9425 99 *pos = '/';
67d42212 100 return -3;
b2cb9425 101 }
457f06d6 102 }
67d42212
JR
103 else if (mkdir(path, 0777)) {
104 *pos = '/';
105 return -1;
106 }
457f06d6
JS
107 else if (adjust_shared_perm(path)) {
108 *pos = '/';
109 return -2;
110 }
b2cb9425
JH
111 *pos++ = '/';
112 }
113 return 0;
114}
723c31fe 115
0fcfd160
LT
116char * sha1_to_hex(const unsigned char *sha1)
117{
dcb3450f
LT
118 static int bufno;
119 static char hexbuffer[4][50];
0fcfd160 120 static const char hex[] = "0123456789abcdef";
dcb3450f 121 char *buffer = hexbuffer[3 & ++bufno], *buf = buffer;
0fcfd160
LT
122 int i;
123
124 for (i = 0; i < 20; i++) {
125 unsigned int val = *sha1++;
126 *buf++ = hex[val >> 4];
127 *buf++ = hex[val & 0xf];
128 }
1e80e044
JS
129 *buf = '\0';
130
0fcfd160
LT
131 return buffer;
132}
133
ace1534d
JH
134static void fill_sha1_path(char *pathbuf, const unsigned char *sha1)
135{
136 int i;
137 for (i = 0; i < 20; i++) {
138 static char hex[] = "0123456789abcdef";
139 unsigned int val = sha1[i];
140 char *pos = pathbuf + i*2 + (i > 0);
141 *pos++ = hex[val >> 4];
142 *pos = hex[val & 0xf];
143 }
144}
145
0fcfd160
LT
146/*
147 * NOTE! This returns a statically allocated buffer, so you have to be
9befac47 148 * careful about using it. Do a "xstrdup()" if you need to save the
0fcfd160 149 * filename.
ace1534d
JH
150 *
151 * Also note that this returns the location for creating. Reading
152 * SHA1 file can happen from any alternate directory listed in the
d19938ab 153 * DB_ENVIRONMENT environment variable if it is not found in
ace1534d 154 * the primary object database.
0fcfd160
LT
155 */
156char *sha1_file_name(const unsigned char *sha1)
157{
0fcfd160
LT
158 static char *name, *base;
159
160 if (!base) {
d19938ab 161 const char *sha1_file_directory = get_object_directory();
0fcfd160 162 int len = strlen(sha1_file_directory);
812666c8 163 base = xmalloc(len + 60);
0fcfd160
LT
164 memcpy(base, sha1_file_directory, len);
165 memset(base+len, 0, 60);
166 base[len] = '/';
167 base[len+3] = '/';
168 name = base + len + 1;
169 }
ace1534d 170 fill_sha1_path(name, sha1);
0fcfd160
LT
171 return base;
172}
173
bf592c50
DB
174char *sha1_pack_name(const unsigned char *sha1)
175{
176 static const char hex[] = "0123456789abcdef";
177 static char *name, *base, *buf;
178 int i;
179
180 if (!base) {
181 const char *sha1_file_directory = get_object_directory();
182 int len = strlen(sha1_file_directory);
183 base = xmalloc(len + 60);
184 sprintf(base, "%s/pack/pack-1234567890123456789012345678901234567890.pack", sha1_file_directory);
185 name = base + len + 11;
186 }
187
188 buf = name;
189
190 for (i = 0; i < 20; i++) {
191 unsigned int val = *sha1++;
192 *buf++ = hex[val >> 4];
193 *buf++ = hex[val & 0xf];
194 }
195
196 return base;
197}
198
199char *sha1_pack_index_name(const unsigned char *sha1)
200{
201 static const char hex[] = "0123456789abcdef";
202 static char *name, *base, *buf;
203 int i;
204
205 if (!base) {
206 const char *sha1_file_directory = get_object_directory();
207 int len = strlen(sha1_file_directory);
208 base = xmalloc(len + 60);
209 sprintf(base, "%s/pack/pack-1234567890123456789012345678901234567890.idx", sha1_file_directory);
210 name = base + len + 11;
211 }
212
213 buf = name;
214
215 for (i = 0; i < 20; i++) {
216 unsigned int val = *sha1++;
217 *buf++ = hex[val >> 4];
218 *buf++ = hex[val & 0xf];
219 }
220
221 return base;
222}
223
d5a63b99
JH
224struct alternate_object_database *alt_odb_list;
225static struct alternate_object_database **alt_odb_tail;
ace1534d 226
c2f493a4
MW
227static void read_info_alternates(const char * alternates, int depth);
228
ddd5d056
JH
229/*
230 * Prepare alternate object database registry.
d5a63b99
JH
231 *
232 * The variable alt_odb_list points at the list of struct
233 * alternate_object_database. The elements on this list come from
234 * non-empty elements from colon separated ALTERNATE_DB_ENVIRONMENT
235 * environment variable, and $GIT_OBJECT_DIRECTORY/info/alternates,
1494e038
JH
236 * whose contents is similar to that environment variable but can be
237 * LF separated. Its base points at a statically allocated buffer that
d5a63b99
JH
238 * contains "/the/directory/corresponding/to/.git/objects/...", while
239 * its name points just after the slash at the end of ".git/objects/"
240 * in the example above, and has enough space to hold 40-byte hex
241 * SHA1, an extra slash for the first level indirection, and the
242 * terminating NUL.
ddd5d056 243 */
c2f493a4 244static int link_alt_odb_entry(const char * entry, int len, const char * relative_base, int depth)
ace1534d 245{
c2f493a4 246 struct stat st;
1494e038 247 const char *objdir = get_object_directory();
c2f493a4
MW
248 struct alternate_object_database *ent;
249 struct alternate_object_database *alt;
250 /* 43 = 40-byte + 2 '/' + terminating NUL */
251 int pfxlen = len;
252 int entlen = pfxlen + 43;
ccfd3e99 253 int base_len = -1;
d5a63b99 254
c2f493a4
MW
255 if (*entry != '/' && relative_base) {
256 /* Relative alt-odb */
257 if (base_len < 0)
258 base_len = strlen(relative_base) + 1;
259 entlen += base_len;
260 pfxlen += base_len;
261 }
262 ent = xmalloc(sizeof(*ent) + entlen);
263
264 if (*entry != '/' && relative_base) {
265 memcpy(ent->base, relative_base, base_len - 1);
266 ent->base[base_len - 1] = '/';
267 memcpy(ent->base + base_len, entry, len);
268 }
269 else
270 memcpy(ent->base, entry, pfxlen);
271
272 ent->name = ent->base + pfxlen + 1;
273 ent->base[pfxlen + 3] = '/';
274 ent->base[pfxlen] = ent->base[entlen-1] = 0;
275
276 /* Detect cases where alternate disappeared */
277 if (stat(ent->base, &st) || !S_ISDIR(st.st_mode)) {
278 error("object directory %s does not exist; "
279 "check .git/objects/info/alternates.",
280 ent->base);
281 free(ent);
282 return -1;
283 }
284
285 /* Prevent the common mistake of listing the same
286 * thing twice, or object directory itself.
287 */
288 for (alt = alt_odb_list; alt; alt = alt->next) {
289 if (!memcmp(ent->base, alt->base, pfxlen)) {
290 free(ent);
291 return -1;
292 }
293 }
294 if (!memcmp(ent->base, objdir, pfxlen)) {
295 free(ent);
296 return -1;
297 }
298
299 /* add the alternate entry */
300 *alt_odb_tail = ent;
301 alt_odb_tail = &(ent->next);
302 ent->next = NULL;
303
304 /* recursively add alternates */
305 read_info_alternates(ent->base, depth + 1);
306
307 ent->base[pfxlen] = '/';
308
309 return 0;
310}
311
312static void link_alt_odb_entries(const char *alt, const char *ep, int sep,
313 const char *relative_base, int depth)
314{
315 const char *cp, *last;
316
317 if (depth > 5) {
318 error("%s: ignoring alternate object stores, nesting too deep.",
319 relative_base);
320 return;
321 }
322
d5a63b99 323 last = alt;
9577e7e3
JH
324 while (last < ep) {
325 cp = last;
326 if (cp < ep && *cp == '#') {
327 while (cp < ep && *cp != sep)
328 cp++;
329 last = cp + 1;
330 continue;
331 }
c2f493a4
MW
332 while (cp < ep && *cp != sep)
333 cp++;
d5a63b99 334 if (last != cp) {
c2f493a4
MW
335 if ((*last != '/') && depth) {
336 error("%s: ignoring relative alternate object store %s",
337 relative_base, last);
338 } else {
339 link_alt_odb_entry(last, cp - last,
340 relative_base, depth);
1494e038 341 }
d5a63b99 342 }
9577e7e3 343 while (cp < ep && *cp == sep)
d5a63b99
JH
344 cp++;
345 last = cp;
9577e7e3 346 }
d5a63b99
JH
347}
348
c2f493a4 349static void read_info_alternates(const char * relative_base, int depth)
d5a63b99 350{
9577e7e3 351 char *map;
d5a63b99 352 struct stat st;
c2f493a4
MW
353 char path[PATH_MAX];
354 int fd;
d5a63b99 355
c2f493a4 356 sprintf(path, "%s/info/alternates", relative_base);
d5a63b99
JH
357 fd = open(path, O_RDONLY);
358 if (fd < 0)
359 return;
360 if (fstat(fd, &st) || (st.st_size == 0)) {
361 close(fd);
9a217f2a 362 return;
ace1534d 363 }
c4712e45 364 map = xmmap(NULL, st.st_size, PROT_READ, MAP_PRIVATE, fd, 0);
d5a63b99 365 close(fd);
d5a63b99 366
c2f493a4
MW
367 link_alt_odb_entries(map, map + st.st_size, '\n', relative_base, depth);
368
d5a63b99 369 munmap(map, st.st_size);
ace1534d
JH
370}
371
c2f493a4
MW
372void prepare_alt_odb(void)
373{
554fe20d 374 const char *alt;
c2f493a4
MW
375
376 alt = getenv(ALTERNATE_DB_ENVIRONMENT);
377 if (!alt) alt = "";
378
379 if (alt_odb_tail)
380 return;
381 alt_odb_tail = &alt_odb_list;
382 link_alt_odb_entries(alt, alt + strlen(alt), ':', NULL, 0);
383
384 read_info_alternates(get_object_directory(), 0);
385}
386
ace1534d
JH
387static char *find_sha1_file(const unsigned char *sha1, struct stat *st)
388{
ace1534d 389 char *name = sha1_file_name(sha1);
d5a63b99 390 struct alternate_object_database *alt;
ace1534d
JH
391
392 if (!stat(name, st))
393 return name;
9a217f2a 394 prepare_alt_odb();
d5a63b99
JH
395 for (alt = alt_odb_list; alt; alt = alt->next) {
396 name = alt->name;
ace1534d 397 fill_sha1_path(name, sha1);
d5a63b99
JH
398 if (!stat(alt->base, st))
399 return alt->base;
ace1534d
JH
400 }
401 return NULL;
402}
403
60bb8b14 404static unsigned int pack_used_ctr;
a53128b6
SP
405static unsigned int pack_mmap_calls;
406static unsigned int peak_pack_open_windows;
407static unsigned int pack_open_windows;
408static size_t peak_pack_mapped;
60bb8b14
SP
409static size_t pack_mapped;
410static size_t page_size;
9a217f2a 411struct packed_git *packed_git;
1f688557 412
a53128b6
SP
413void pack_report()
414{
415 fprintf(stderr,
e05db0fd
PR
416 "pack_report: getpagesize() = %10" SZ_FMT "\n"
417 "pack_report: core.packedGitWindowSize = %10" SZ_FMT "\n"
418 "pack_report: core.packedGitLimit = %10" SZ_FMT "\n",
a53128b6
SP
419 page_size,
420 packed_git_window_size,
421 packed_git_limit);
422 fprintf(stderr,
423 "pack_report: pack_used_ctr = %10u\n"
424 "pack_report: pack_mmap_calls = %10u\n"
425 "pack_report: pack_open_windows = %10u / %10u\n"
e05db0fd
PR
426 "pack_report: pack_mapped = "
427 "%10" SZ_FMT " / %10" SZ_FMT "\n",
a53128b6
SP
428 pack_used_ctr,
429 pack_mmap_calls,
430 pack_open_windows, peak_pack_open_windows,
431 pack_mapped, peak_pack_mapped);
432}
433
1f688557
JH
434static int check_packed_git_idx(const char *path, unsigned long *idx_size_,
435 void **idx_map_)
436{
437 void *idx_map;
b18b00a6 438 uint32_t *index;
1f688557
JH
439 unsigned long idx_size;
440 int nr, i;
e93ec6f9 441 int fd = open(path, O_RDONLY);
1f688557
JH
442 struct stat st;
443 if (fd < 0)
444 return -1;
445 if (fstat(fd, &st)) {
446 close(fd);
447 return -1;
448 }
449 idx_size = st.st_size;
c4712e45 450 idx_map = xmmap(NULL, idx_size, PROT_READ, MAP_PRIVATE, fd, 0);
1f688557 451 close(fd);
1f688557
JH
452
453 index = idx_map;
4d235c80
LT
454 *idx_map_ = idx_map;
455 *idx_size_ = idx_size;
1f688557
JH
456
457 /* check index map */
f9253394 458 if (idx_size < 4*256 + 20 + 20)
df1b059d
SP
459 return error("index file %s is too small", path);
460
461 /* a future index format would start with this, as older git
462 * binaries would fail the non-monotonic index check below.
463 * give a nicer warning to the user if we can.
464 */
465 if (index[0] == htonl(PACK_IDX_SIGNATURE))
466 return error("index file %s is a newer version"
467 " and is not supported by this binary"
468 " (try upgrading GIT to a newer version)",
469 path);
470
1f688557
JH
471 nr = 0;
472 for (i = 0; i < 256; i++) {
473 unsigned int n = ntohl(index[i]);
474 if (n < nr)
df1b059d 475 return error("non-monotonic index %s", path);
1f688557
JH
476 nr = n;
477 }
478
479 /*
480 * Total size:
481 * - 256 index entries 4 bytes each
482 * - 24-byte entries * nr (20-byte sha1 + 4-byte offset)
483 * - 20-byte SHA1 of the packfile
484 * - 20-byte SHA1 file checksum
485 */
486 if (idx_size != 4*256 + nr * 24 + 20 + 20)
df1b059d 487 return error("wrong index file size in %s", path);
1f688557 488
1f688557
JH
489 return 0;
490}
491
11daf39b
SP
492static void scan_windows(struct packed_git *p,
493 struct packed_git **lru_p,
494 struct pack_window **lru_w,
495 struct pack_window **lru_l)
1f688557 496{
11daf39b
SP
497 struct pack_window *w, *w_l;
498
499 for (w_l = NULL, w = p->windows; w; w = w->next) {
500 if (!w->inuse_cnt) {
501 if (!*lru_w || w->last_used < (*lru_w)->last_used) {
502 *lru_p = p;
503 *lru_w = w;
504 *lru_l = w_l;
54044bf8 505 }
54044bf8 506 }
11daf39b 507 w_l = w;
f9253394 508 }
11daf39b
SP
509}
510
511static int unuse_one_window(struct packed_git *current)
512{
513 struct packed_git *p, *lru_p = NULL;
514 struct pack_window *lru_w = NULL, *lru_l = NULL;
515
516 if (current)
517 scan_windows(current, &lru_p, &lru_w, &lru_l);
518 for (p = packed_git; p; p = p->next)
519 scan_windows(p, &lru_p, &lru_w, &lru_l);
54044bf8
SP
520 if (lru_p) {
521 munmap(lru_w->base, lru_w->len);
522 pack_mapped -= lru_w->len;
523 if (lru_l)
524 lru_l->next = lru_w->next;
525 else {
526 lru_p->windows = lru_w->next;
11daf39b 527 if (!lru_p->windows && lru_p != current) {
54044bf8
SP
528 close(lru_p->pack_fd);
529 lru_p->pack_fd = -1;
530 }
531 }
532 free(lru_w);
a53128b6 533 pack_open_windows--;
54044bf8
SP
534 return 1;
535 }
536 return 0;
f9253394
JH
537}
538
97bfeb34
SP
539void release_pack_memory(size_t need)
540{
541 size_t cur = pack_mapped;
542 while (need >= (cur - pack_mapped) && unuse_one_window(NULL))
543 ; /* nothing */
544}
545
03e79c88 546void unuse_pack(struct pack_window **w_cursor)
f9253394 547{
03e79c88
SP
548 struct pack_window *w = *w_cursor;
549 if (w) {
550 w->inuse_cnt--;
551 *w_cursor = NULL;
552 }
1f688557
JH
553}
554
9bc879c1 555static void open_packed_git(struct packed_git *p)
1f688557 556{
9bc879c1
SP
557 struct stat st;
558 struct pack_header hdr;
559 unsigned char sha1[20];
560 unsigned char *idx_sha1;
2c039da8 561 long fd_flag;
9bc879c1
SP
562
563 p->pack_fd = open(p->pack_name, O_RDONLY);
564 if (p->pack_fd < 0 || fstat(p->pack_fd, &st))
565 die("packfile %s cannot be opened", p->pack_name);
566
567 /* If we created the struct before we had the pack we lack size. */
bf592c50 568 if (!p->pack_size) {
bf592c50
DB
569 if (!S_ISREG(st.st_mode))
570 die("packfile %s not a regular file", p->pack_name);
571 p->pack_size = st.st_size;
9bc879c1
SP
572 } else if (p->pack_size != st.st_size)
573 die("packfile %s size changed", p->pack_name);
574
2c039da8
JH
575 /* We leave these file descriptors open with sliding mmap;
576 * there is no point keeping them open across exec(), though.
577 */
578 fd_flag = fcntl(p->pack_fd, F_GETFD, 0);
579 if (fd_flag < 0)
580 die("cannot determine file descriptor flags");
581 fd_flag |= FD_CLOEXEC;
582 if (fcntl(p->pack_fd, F_SETFD, fd_flag) == -1)
583 die("cannot set FD_CLOEXEC");
584
9bc879c1 585 /* Verify we recognize this pack file format. */
e6e2bd62
SP
586 if (read_in_full(p->pack_fd, &hdr, sizeof(hdr)) != sizeof(hdr))
587 die("file %s is far too short to be a packfile", p->pack_name);
9bc879c1
SP
588 if (hdr.hdr_signature != htonl(PACK_SIGNATURE))
589 die("file %s is not a GIT packfile", p->pack_name);
590 if (!pack_version_ok(hdr.hdr_version))
591 die("packfile %s is version %u and not supported"
592 " (try upgrading GIT to a newer version)",
593 p->pack_name, ntohl(hdr.hdr_version));
594
595 /* Verify the pack matches its index. */
596 if (num_packed_objects(p) != ntohl(hdr.hdr_entries))
597 die("packfile %s claims to have %u objects"
598 " while index size indicates %u objects",
599 p->pack_name, ntohl(hdr.hdr_entries),
600 num_packed_objects(p));
601 if (lseek(p->pack_fd, p->pack_size - sizeof(sha1), SEEK_SET) == -1)
602 die("end of packfile %s is unavailable", p->pack_name);
e6e2bd62
SP
603 if (read_in_full(p->pack_fd, sha1, sizeof(sha1)) != sizeof(sha1))
604 die("packfile %s signature is unavailable", p->pack_name);
9bc879c1
SP
605 idx_sha1 = ((unsigned char *)p->index_base) + p->index_size - 40;
606 if (hashcmp(sha1, idx_sha1))
607 die("packfile %s does not match index", p->pack_name);
608}
609
60bb8b14
SP
610static int in_window(struct pack_window *win, unsigned long offset)
611{
612 /* We must promise at least 20 bytes (one hash) after the
613 * offset is available from this window, otherwise the offset
614 * is not actually in this window and a different window (which
615 * has that one hash excess) must be used. This is to support
616 * the object header and delta base parsing routines below.
617 */
618 off_t win_off = win->offset;
619 return win_off <= offset
620 && (offset + 20) <= (win_off + win->len);
621}
622
03e79c88
SP
623unsigned char* use_pack(struct packed_git *p,
624 struct pack_window **w_cursor,
625 unsigned long offset,
626 unsigned int *left)
9bc879c1 627{
60bb8b14 628 struct pack_window *win = *w_cursor;
03e79c88 629
9bc879c1
SP
630 if (p->pack_fd == -1)
631 open_packed_git(p);
60bb8b14
SP
632
633 /* Since packfiles end in a hash of their content and its
634 * pointless to ask for an offset into the middle of that
635 * hash, and the in_window function above wouldn't match
636 * don't allow an offset too close to the end of the file.
637 */
638 if (offset > (p->pack_size - 20))
639 die("offset beyond end of packfile (truncated pack?)");
640
641 if (!win || !in_window(win, offset)) {
642 if (win)
643 win->inuse_cnt--;
644 for (win = p->windows; win; win = win->next) {
645 if (in_window(win, offset))
646 break;
647 }
648 if (!win) {
649 if (!page_size)
650 page_size = getpagesize();
651 win = xcalloc(1, sizeof(*win));
652 win->offset = (offset / page_size) * page_size;
653 win->len = p->pack_size - win->offset;
654 if (win->len > packed_git_window_size)
655 win->len = packed_git_window_size;
656 pack_mapped += win->len;
11daf39b
SP
657 while (packed_git_limit < pack_mapped
658 && unuse_one_window(p))
60bb8b14 659 ; /* nothing */
c4712e45 660 win->base = xmmap(NULL, win->len,
60bb8b14
SP
661 PROT_READ, MAP_PRIVATE,
662 p->pack_fd, win->offset);
663 if (win->base == MAP_FAILED)
73b4e4be
SP
664 die("packfile %s cannot be mapped: %s",
665 p->pack_name,
666 strerror(errno));
a53128b6
SP
667 pack_mmap_calls++;
668 pack_open_windows++;
669 if (pack_mapped > peak_pack_mapped)
670 peak_pack_mapped = pack_mapped;
671 if (pack_open_windows > peak_pack_open_windows)
672 peak_pack_open_windows = pack_open_windows;
60bb8b14
SP
673 win->next = p->windows;
674 p->windows = win;
675 }
1f688557 676 }
03e79c88
SP
677 if (win != *w_cursor) {
678 win->last_used = pack_used_ctr++;
679 win->inuse_cnt++;
680 *w_cursor = win;
681 }
60bb8b14 682 offset -= win->offset;
03e79c88
SP
683 if (left)
684 *left = win->len - offset;
685 return win->base + offset;
1f688557
JH
686}
687
9d835df2 688struct packed_git *add_packed_git(char *path, int path_len, int local)
1f688557
JH
689{
690 struct stat st;
691 struct packed_git *p;
692 unsigned long idx_size;
693 void *idx_map;
c0bbbb1b 694 unsigned char sha1[20];
1f688557
JH
695
696 if (check_packed_git_idx(path, &idx_size, &idx_map))
697 return NULL;
698
699 /* do we have a corresponding .pack file? */
700 strcpy(path + path_len - 4, ".pack");
701 if (stat(path, &st) || !S_ISREG(st.st_mode)) {
702 munmap(idx_map, idx_size);
703 return NULL;
704 }
705 /* ok, it looks sane as far as we can check without
706 * actually mapping the pack file.
707 */
708 p = xmalloc(sizeof(*p) + path_len + 2);
709 strcpy(p->pack_name, path);
710 p->index_size = idx_size;
711 p->pack_size = st.st_size;
712 p->index_base = idx_map;
713 p->next = NULL;
c41ee586 714 p->windows = NULL;
9bc879c1 715 p->pack_fd = -1;
9d835df2 716 p->pack_local = local;
f4a11066 717 if ((path_len > 44) && !get_sha1_hex(path + path_len - 44, sha1))
e702496e 718 hashcpy(p->sha1, sha1);
1f688557
JH
719 return p;
720}
721
bf592c50 722struct packed_git *parse_pack_index(unsigned char *sha1)
c508df5e
DB
723{
724 char *path = sha1_pack_index_name(sha1);
725 return parse_pack_index_file(sha1, path);
726}
727
2ab141a2 728struct packed_git *parse_pack_index_file(const unsigned char *sha1, char *idx_path)
bf592c50
DB
729{
730 struct packed_git *p;
731 unsigned long idx_size;
732 void *idx_map;
c508df5e 733 char *path;
bf592c50 734
c508df5e 735 if (check_packed_git_idx(idx_path, &idx_size, &idx_map))
bf592c50
DB
736 return NULL;
737
738 path = sha1_pack_name(sha1);
739
740 p = xmalloc(sizeof(*p) + strlen(path) + 2);
741 strcpy(p->pack_name, path);
742 p->index_size = idx_size;
743 p->pack_size = 0;
744 p->index_base = idx_map;
745 p->next = NULL;
c41ee586 746 p->windows = NULL;
9bc879c1 747 p->pack_fd = -1;
e702496e 748 hashcpy(p->sha1, sha1);
bf592c50
DB
749 return p;
750}
751
752void install_packed_git(struct packed_git *pack)
753{
754 pack->next = packed_git;
755 packed_git = pack;
756}
757
9d835df2 758static void prepare_packed_git_one(char *objdir, int local)
1f688557
JH
759{
760 char path[PATH_MAX];
761 int len;
762 DIR *dir;
763 struct dirent *de;
764
765 sprintf(path, "%s/pack", objdir);
766 len = strlen(path);
767 dir = opendir(path);
b5b16990 768 if (!dir) {
26125f6b 769 if (errno != ENOENT)
bd2afde8 770 error("unable to open object pack directory: %s: %s",
26125f6b 771 path, strerror(errno));
1f688557 772 return;
b5b16990 773 }
1f688557
JH
774 path[len++] = '/';
775 while ((de = readdir(dir)) != NULL) {
776 int namelen = strlen(de->d_name);
777 struct packed_git *p;
778
5bb1cda5 779 if (!has_extension(de->d_name, ".idx"))
1f688557
JH
780 continue;
781
782 /* we have .idx. Is it a file we can map? */
783 strcpy(path + len, de->d_name);
86f7780c
JK
784 for (p = packed_git; p; p = p->next) {
785 if (!memcmp(path, p->pack_name, len + namelen - 4))
786 break;
787 }
788 if (p)
789 continue;
9d835df2 790 p = add_packed_git(path, len + namelen, local);
1f688557
JH
791 if (!p)
792 continue;
793 p->next = packed_git;
794 packed_git = p;
795 }
5b35bcd5 796 closedir(dir);
1f688557
JH
797}
798
637cdd9d 799static int prepare_packed_git_run_once = 0;
9a217f2a 800void prepare_packed_git(void)
1f688557 801{
d5a63b99 802 struct alternate_object_database *alt;
1f688557 803
637cdd9d 804 if (prepare_packed_git_run_once)
1f688557 805 return;
9d835df2 806 prepare_packed_git_one(get_object_directory(), 1);
9a217f2a 807 prepare_alt_odb();
d5a63b99 808 for (alt = alt_odb_list; alt; alt = alt->next) {
1494e038 809 alt->name[-1] = 0;
9d835df2 810 prepare_packed_git_one(alt->base, 0);
1494e038 811 alt->name[-1] = '/';
1f688557 812 }
637cdd9d
JK
813 prepare_packed_git_run_once = 1;
814}
815
fc04c412 816void reprepare_packed_git(void)
637cdd9d
JK
817{
818 prepare_packed_git_run_once = 0;
819 prepare_packed_git();
1f688557
JH
820}
821
5d6ccf5c 822int check_sha1_signature(const unsigned char *sha1, void *map, unsigned long size, const char *type)
0fcfd160
LT
823{
824 unsigned char real_sha1[20];
7cfb5f36 825 hash_sha1_file(map, size, type, real_sha1);
a89fccd2 826 return hashcmp(sha1, real_sha1) ? -1 : 0;
0fcfd160
LT
827}
828
bb6b8e4f 829void *map_sha1_file(const unsigned char *sha1, unsigned long *size)
0fcfd160 830{
0fcfd160
LT
831 struct stat st;
832 void *map;
144bde78 833 int fd;
ace1534d
JH
834 char *filename = find_sha1_file(sha1, &st);
835
836 if (!filename) {
ace1534d
JH
837 return NULL;
838 }
0fcfd160 839
144bde78 840 fd = open(filename, O_RDONLY | sha1_file_open_flag);
0fcfd160 841 if (fd < 0) {
144bde78
LT
842 /* See if it works without O_NOATIME */
843 switch (sha1_file_open_flag) {
844 default:
845 fd = open(filename, O_RDONLY);
846 if (fd >= 0)
847 break;
848 /* Fallthrough */
849 case 0:
144bde78
LT
850 return NULL;
851 }
852
1f688557
JH
853 /* If it failed once, it will probably fail again.
854 * Stop using O_NOATIME
855 */
144bde78 856 sha1_file_open_flag = 0;
0fcfd160 857 }
c4712e45 858 map = xmmap(NULL, st.st_size, PROT_READ, MAP_PRIVATE, fd, 0);
0fcfd160 859 close(fd);
0fcfd160
LT
860 *size = st.st_size;
861 return map;
862}
863
bb6b8e4f
JH
864int legacy_loose_object(unsigned char *map)
865{
866 unsigned int word;
867
868 /*
869 * Is it a zlib-compressed buffer? If so, the first byte
870 * must be 0x78 (15-bit window size, deflated), and the
871 * first 16-bit word is evenly divisible by 31
872 */
873 word = (map[0] << 8) + map[1];
874 if (map[0] == 0x78 && !(word % 31))
875 return 1;
876 else
877 return 0;
878}
879
72518e9c 880unsigned long unpack_object_header_gently(const unsigned char *buf, unsigned long len, enum object_type *type, unsigned long *sizep)
c4483576 881{
ad1ed5ee 882 unsigned shift;
93821bd9 883 unsigned char c;
93821bd9 884 unsigned long size;
ad1ed5ee
JH
885 unsigned long used = 0;
886
887 c = buf[used++];
888 *type = (c >> 4) & 7;
889 size = c & 15;
890 shift = 4;
891 while (c & 0x80) {
892 if (len <= used)
893 return 0;
894 if (sizeof(long) * 8 <= shift)
895 return 0;
896 c = buf[used++];
897 size += (c & 0x7f) << shift;
898 shift += 7;
899 }
900 *sizep = size;
901 return used;
902}
903
904static int unpack_sha1_header(z_stream *stream, unsigned char *map, unsigned long mapsize, void *buffer, unsigned long bufsiz)
905{
906 unsigned long size, used;
907 static const char valid_loose_object_type[8] = {
908 0, /* OBJ_EXT */
909 1, 1, 1, 1, /* "commit", "tree", "blob", "tag" */
910 0, /* "delta" and others are invalid in a loose object */
93821bd9 911 };
ad1ed5ee 912 enum object_type type;
93821bd9 913
c4483576
LT
914 /* Get the data stream */
915 memset(stream, 0, sizeof(*stream));
916 stream->next_in = map;
917 stream->avail_in = mapsize;
918 stream->next_out = buffer;
93821bd9
LT
919 stream->avail_out = bufsiz;
920
bb6b8e4f 921 if (legacy_loose_object(map)) {
93821bd9
LT
922 inflateInit(stream);
923 return inflate(stream, 0);
924 }
925
ad1ed5ee
JH
926 used = unpack_object_header_gently(map, mapsize, &type, &size);
927 if (!used || !valid_loose_object_type[type])
93821bd9 928 return -1;
ad1ed5ee
JH
929 map += used;
930 mapsize -= used;
93821bd9
LT
931
932 /* Set up the stream for the rest.. */
933 stream->next_in = map;
934 stream->avail_in = mapsize;
c4483576 935 inflateInit(stream);
93821bd9
LT
936
937 /* And generate the fake traditional header */
ad1ed5ee
JH
938 stream->total_out = 1 + snprintf(buffer, bufsiz, "%s %lu",
939 type_names[type], size);
93821bd9 940 return 0;
c4483576
LT
941}
942
6da4016a 943static void *unpack_sha1_rest(z_stream *stream, void *buffer, unsigned long size)
5180cacc
LT
944{
945 int bytes = strlen(buffer) + 1;
d565b341 946 unsigned char *buf = xmalloc(1+size);
93821bd9 947 unsigned long n;
5180cacc 948
93821bd9
LT
949 n = stream->total_out - bytes;
950 if (n > size)
951 n = size;
952 memcpy(buf, (char *) buffer + bytes, n);
953 bytes = n;
5180cacc
LT
954 if (bytes < size) {
955 stream->next_out = buf + bytes;
956 stream->avail_out = size - bytes;
957 while (inflate(stream, Z_FINISH) == Z_OK)
958 /* nothing */;
959 }
960 buf[size] = 0;
961 inflateEnd(stream);
962 return buf;
963}
964
965/*
966 * We used to just use "sscanf()", but that's actually way
967 * too permissive for what we want to check. So do an anal
968 * object header parse by hand.
969 */
38d3874d 970static int parse_sha1_header(char *hdr, char *type, unsigned long *sizep)
5180cacc
LT
971{
972 int i;
973 unsigned long size;
974
975 /*
976 * The type can be at most ten bytes (including the
977 * terminating '\0' that we add), and is followed by
978 * a space.
979 */
980 i = 10;
981 for (;;) {
982 char c = *hdr++;
983 if (c == ' ')
984 break;
985 if (!--i)
986 return -1;
987 *type++ = c;
988 }
989 *type = 0;
990
991 /*
992 * The length must follow immediately, and be in canonical
993 * decimal format (ie "010" is not valid).
994 */
995 size = *hdr++ - '0';
996 if (size > 9)
997 return -1;
998 if (size) {
999 for (;;) {
1000 unsigned long c = *hdr - '0';
1001 if (c > 9)
1002 break;
1003 hdr++;
1004 size = size * 10 + c;
1005 }
1006 }
1007 *sizep = size;
1008
1009 /*
1010 * The length must be followed by a zero byte
1011 */
1012 return *hdr ? -1 : 0;
1013}
1014
0fcfd160
LT
1015void * unpack_sha1_file(void *map, unsigned long mapsize, char *type, unsigned long *size)
1016{
5180cacc 1017 int ret;
0fcfd160 1018 z_stream stream;
5180cacc 1019 char hdr[8192];
0fcfd160 1020
5180cacc
LT
1021 ret = unpack_sha1_header(&stream, map, mapsize, hdr, sizeof(hdr));
1022 if (ret < Z_OK || parse_sha1_header(hdr, type, size) < 0)
0fcfd160
LT
1023 return NULL;
1024
5180cacc 1025 return unpack_sha1_rest(&stream, hdr, *size);
0fcfd160
LT
1026}
1027
eb32d236 1028static unsigned long get_delta_base(struct packed_git *p,
03e79c88 1029 struct pack_window **w_curs,
eb32d236
NP
1030 unsigned long offset,
1031 enum object_type kind,
1032 unsigned long delta_obj_offset,
1033 unsigned long *base_obj_offset)
1034{
03e79c88 1035 unsigned char *base_info = use_pack(p, w_curs, offset, NULL);
eb32d236
NP
1036 unsigned long base_offset;
1037
8d8a4ea5
SP
1038 /* use_pack() assured us we have [base_info, base_info + 20)
1039 * as a range that we can look at without walking off the
1040 * end of the mapped window. Its actually the hash size
1041 * that is assured. An OFS_DELTA longer than the hash size
1042 * is stupid, as then a REF_DELTA would be smaller to store.
1043 */
eb32d236
NP
1044 if (kind == OBJ_OFS_DELTA) {
1045 unsigned used = 0;
1046 unsigned char c = base_info[used++];
1047 base_offset = c & 127;
1048 while (c & 128) {
1049 base_offset += 1;
1050 if (!base_offset || base_offset & ~(~0UL >> 7))
1051 die("offset value overflow for delta base object");
1052 c = base_info[used++];
1053 base_offset = (base_offset << 7) + (c & 127);
1054 }
1055 base_offset = delta_obj_offset - base_offset;
1056 if (base_offset >= delta_obj_offset)
1057 die("delta base offset out of bound");
1058 offset += used;
1059 } else if (kind == OBJ_REF_DELTA) {
1060 /* The base entry _must_ be in the same pack */
1061 base_offset = find_pack_entry_one(base_info, p);
1062 if (!base_offset)
1063 die("failed to find delta-pack base object %s",
1064 sha1_to_hex(base_info));
1065 offset += 20;
1066 } else
1067 die("I am totally screwed");
1068 *base_obj_offset = base_offset;
1069 return offset;
1070}
1071
f3bf9224 1072/* forward declaration for a mutually recursive function */
43057304 1073static int packed_object_info(struct packed_git *p, unsigned long offset,
f3bf9224
JH
1074 char *type, unsigned long *sizep);
1075
43057304 1076static int packed_delta_info(struct packed_git *p,
03e79c88 1077 struct pack_window **w_curs,
43057304 1078 unsigned long offset,
eb32d236
NP
1079 enum object_type kind,
1080 unsigned long obj_offset,
5db47c2b 1081 char *type,
43057304 1082 unsigned long *sizep)
5db47c2b 1083{
43057304 1084 unsigned long base_offset;
f3bf9224 1085
03e79c88
SP
1086 offset = get_delta_base(p, w_curs, offset, kind,
1087 obj_offset, &base_offset);
f3bf9224 1088
c62266f3
JH
1089 /* We choose to only get the type of the base object and
1090 * ignore potentially corrupt pack file that expects the delta
1091 * based on a base with a wrong size. This saves tons of
1092 * inflate() calls.
1093 */
43057304 1094 if (packed_object_info(p, base_offset, type, NULL))
c62266f3 1095 die("cannot get info for delta-pack base");
5db47c2b 1096
c62266f3
JH
1097 if (sizep) {
1098 const unsigned char *data;
079afb18 1099 unsigned char delta_head[20], *in;
c62266f3
JH
1100 unsigned long result_size;
1101 z_stream stream;
1102 int st;
1103
1104 memset(&stream, 0, sizeof(stream));
c62266f3
JH
1105 stream.next_out = delta_head;
1106 stream.avail_out = sizeof(delta_head);
1107
1108 inflateInit(&stream);
079afb18
SP
1109 do {
1110 in = use_pack(p, w_curs, offset, &stream.avail_in);
1111 stream.next_in = in;
1112 st = inflate(&stream, Z_FINISH);
1113 offset += stream.next_in - in;
1114 } while ((st == Z_OK || st == Z_BUF_ERROR)
1115 && stream.total_out < sizeof(delta_head));
c62266f3
JH
1116 inflateEnd(&stream);
1117 if ((st != Z_STREAM_END) &&
1118 stream.total_out != sizeof(delta_head))
1119 die("delta data unpack-initial failed");
1120
1121 /* Examine the initial part of the delta to figure out
1122 * the result size.
1123 */
1124 data = delta_head;
8960844a
NP
1125
1126 /* ignore base size */
1127 get_delta_hdr_size(&data, delta_head+sizeof(delta_head));
5db47c2b 1128
c62266f3 1129 /* Read the result size */
8960844a 1130 result_size = get_delta_hdr_size(&data, delta_head+sizeof(delta_head));
c62266f3
JH
1131 *sizep = result_size;
1132 }
5db47c2b
JH
1133 return 0;
1134}
1135
03e79c88
SP
1136static unsigned long unpack_object_header(struct packed_git *p,
1137 struct pack_window **w_curs,
1138 unsigned long offset,
1139 enum object_type *type,
1140 unsigned long *sizep)
a733cb60 1141{
03e79c88
SP
1142 unsigned char *base;
1143 unsigned int left;
ad1ed5ee 1144 unsigned long used;
a733cb60 1145
8d8a4ea5
SP
1146 /* use_pack() assures us we have [base, base + 20) available
1147 * as a range that we can look at at. (Its actually the hash
1148 * size that is assurred.) With our object header encoding
1149 * the maximum deflated object size is 2^137, which is just
1150 * insane, so we know won't exceed what we have been given.
1151 */
03e79c88
SP
1152 base = use_pack(p, w_curs, offset, &left);
1153 used = unpack_object_header_gently(base, left, type, sizep);
ad1ed5ee
JH
1154 if (!used)
1155 die("object offset outside of pack file");
1156
1157 return offset + used;
a733cb60
LT
1158}
1159
43057304
NP
1160void packed_object_info_detail(struct packed_git *p,
1161 unsigned long offset,
ad8c80a5
JH
1162 char *type,
1163 unsigned long *size,
1164 unsigned long *store_size,
f8f135c9 1165 unsigned int *delta_chain_length,
ad8c80a5
JH
1166 unsigned char *base_sha1)
1167{
03e79c88 1168 struct pack_window *w_curs = NULL;
eb32d236 1169 unsigned long obj_offset, val;
43057304 1170 unsigned char *next_sha1;
ad8c80a5
JH
1171 enum object_type kind;
1172
43057304 1173 *delta_chain_length = 0;
eb32d236 1174 obj_offset = offset;
03e79c88 1175 offset = unpack_object_header(p, &w_curs, offset, &kind, size);
43057304
NP
1176
1177 for (;;) {
1178 switch (kind) {
1179 default:
08a19d87 1180 die("pack %s contains unknown object type %d",
43057304
NP
1181 p->pack_name, kind);
1182 case OBJ_COMMIT:
1183 case OBJ_TREE:
1184 case OBJ_BLOB:
1185 case OBJ_TAG:
1186 strcpy(type, type_names[kind]);
1187 *store_size = 0; /* notyet */
03e79c88 1188 unuse_pack(&w_curs);
43057304 1189 return;
eb32d236 1190 case OBJ_OFS_DELTA:
03e79c88
SP
1191 get_delta_base(p, &w_curs, offset, kind,
1192 obj_offset, &offset);
eb32d236
NP
1193 if (*delta_chain_length == 0) {
1194 /* TODO: find base_sha1 as pointed by offset */
1195 }
1196 break;
1197 case OBJ_REF_DELTA:
03e79c88 1198 next_sha1 = use_pack(p, &w_curs, offset, NULL);
43057304
NP
1199 if (*delta_chain_length == 0)
1200 hashcpy(base_sha1, next_sha1);
1201 offset = find_pack_entry_one(next_sha1, p);
1202 break;
1203 }
eb32d236 1204 obj_offset = offset;
03e79c88 1205 offset = unpack_object_header(p, &w_curs, offset, &kind, &val);
43057304 1206 (*delta_chain_length)++;
ad8c80a5 1207 }
ad8c80a5
JH
1208}
1209
43057304 1210static int packed_object_info(struct packed_git *p, unsigned long offset,
1f688557
JH
1211 char *type, unsigned long *sizep)
1212{
03e79c88 1213 struct pack_window *w_curs = NULL;
eb32d236 1214 unsigned long size, obj_offset = offset;
a733cb60 1215 enum object_type kind;
03e79c88 1216 int r;
5db47c2b 1217
03e79c88 1218 offset = unpack_object_header(p, &w_curs, offset, &kind, &size);
5db47c2b 1219
a733cb60 1220 switch (kind) {
eb32d236
NP
1221 case OBJ_OFS_DELTA:
1222 case OBJ_REF_DELTA:
03e79c88
SP
1223 r = packed_delta_info(p, &w_curs, offset, kind,
1224 obj_offset, type, sizep);
1225 unuse_pack(&w_curs);
1226 return r;
a733cb60 1227 case OBJ_COMMIT:
a733cb60 1228 case OBJ_TREE:
a733cb60 1229 case OBJ_BLOB:
a733cb60 1230 case OBJ_TAG:
5a18f540 1231 strcpy(type, type_names[kind]);
03e79c88 1232 unuse_pack(&w_curs);
a69d0943 1233 break;
1f688557 1234 default:
08a19d87 1235 die("pack %s contains unknown object type %d",
264b16b6 1236 p->pack_name, kind);
1f688557 1237 }
c62266f3
JH
1238 if (sizep)
1239 *sizep = size;
1f688557
JH
1240 return 0;
1241}
1242
eb950c19 1243static void *unpack_compressed_entry(struct packed_git *p,
03e79c88 1244 struct pack_window **w_curs,
eb950c19
SP
1245 unsigned long offset,
1246 unsigned long size)
de530aaa
SP
1247{
1248 int st;
1249 z_stream stream;
079afb18 1250 unsigned char *buffer, *in;
de530aaa
SP
1251
1252 buffer = xmalloc(size + 1);
1253 buffer[size] = 0;
1254 memset(&stream, 0, sizeof(stream));
de530aaa
SP
1255 stream.next_out = buffer;
1256 stream.avail_out = size;
1257
1258 inflateInit(&stream);
079afb18
SP
1259 do {
1260 in = use_pack(p, w_curs, offset, &stream.avail_in);
1261 stream.next_in = in;
1262 st = inflate(&stream, Z_FINISH);
1263 offset += stream.next_in - in;
1264 } while (st == Z_OK || st == Z_BUF_ERROR);
de530aaa
SP
1265 inflateEnd(&stream);
1266 if ((st != Z_STREAM_END) || stream.total_out != size) {
1267 free(buffer);
1268 return NULL;
1269 }
1270
1271 return buffer;
1272}
1273
eb950c19 1274static void *unpack_delta_entry(struct packed_git *p,
03e79c88 1275 struct pack_window **w_curs,
eb950c19 1276 unsigned long offset,
1f688557 1277 unsigned long delta_size,
eb32d236
NP
1278 enum object_type kind,
1279 unsigned long obj_offset,
1f688557 1280 char *type,
eb950c19 1281 unsigned long *sizep)
1f688557 1282{
7c3e8be3 1283 void *delta_data, *result, *base;
43057304 1284 unsigned long result_size, base_size, base_offset;
43057304 1285
03e79c88
SP
1286 offset = get_delta_base(p, w_curs, offset, kind,
1287 obj_offset, &base_offset);
4d703a1a 1288 base = unpack_entry(p, base_offset, type, &base_size);
67686d95 1289 if (!base)
43057304
NP
1290 die("failed to read delta base object at %lu from %s",
1291 base_offset, p->pack_name);
67686d95 1292
03e79c88 1293 delta_data = unpack_compressed_entry(p, w_curs, offset, delta_size);
1f688557
JH
1294 result = patch_delta(base, base_size,
1295 delta_data, delta_size,
1296 &result_size);
1297 if (!result)
1298 die("failed to apply delta");
1299 free(delta_data);
1300 free(base);
1301 *sizep = result_size;
1302 return result;
1303}
1304
4d703a1a 1305void *unpack_entry(struct packed_git *p, unsigned long offset,
1f688557
JH
1306 char *type, unsigned long *sizep)
1307{
03e79c88 1308 struct pack_window *w_curs = NULL;
4d703a1a
SP
1309 unsigned long size, obj_offset = offset;
1310 enum object_type kind;
f9253394 1311 void *retval;
1f688557 1312
03e79c88 1313 offset = unpack_object_header(p, &w_curs, offset, &kind, &size);
a733cb60 1314 switch (kind) {
eb32d236
NP
1315 case OBJ_OFS_DELTA:
1316 case OBJ_REF_DELTA:
03e79c88
SP
1317 retval = unpack_delta_entry(p, &w_curs, offset, size,
1318 kind, obj_offset, type, sizep);
4d703a1a 1319 break;
a733cb60 1320 case OBJ_COMMIT:
a733cb60 1321 case OBJ_TREE:
a733cb60 1322 case OBJ_BLOB:
a733cb60 1323 case OBJ_TAG:
5a18f540
SP
1324 strcpy(type, type_names[kind]);
1325 *sizep = size;
03e79c88 1326 retval = unpack_compressed_entry(p, &w_curs, offset, size);
4d703a1a 1327 break;
1f688557 1328 default:
4d703a1a 1329 die("unknown object type %i in %s", kind, p->pack_name);
1f688557 1330 }
03e79c88 1331 unuse_pack(&w_curs);
4d703a1a 1332 return retval;
1f688557
JH
1333}
1334
9a217f2a
JH
1335int num_packed_objects(const struct packed_git *p)
1336{
f9253394 1337 /* See check_packed_git_idx() */
9a217f2a
JH
1338 return (p->index_size - 20 - 20 - 4*256) / 24;
1339}
1340
1341int nth_packed_object_sha1(const struct packed_git *p, int n,
1342 unsigned char* sha1)
1343{
1344 void *index = p->index_base + 256;
1345 if (n < 0 || num_packed_objects(p) <= n)
1346 return -1;
e702496e 1347 hashcpy(sha1, (unsigned char *) index + (24 * n) + 4);
9a217f2a
JH
1348 return 0;
1349}
1350
43057304
NP
1351unsigned long find_pack_entry_one(const unsigned char *sha1,
1352 struct packed_git *p)
1f688557 1353{
b18b00a6 1354 uint32_t *level1_ofs = p->index_base;
1f688557
JH
1355 int hi = ntohl(level1_ofs[*sha1]);
1356 int lo = ((*sha1 == 0x0) ? 0 : ntohl(level1_ofs[*sha1 - 1]));
1357 void *index = p->index_base + 256;
1358
1359 do {
1360 int mi = (lo + hi) / 2;
a89fccd2 1361 int cmp = hashcmp((unsigned char *)index + (24 * mi) + 4, sha1);
43057304 1362 if (!cmp)
b18b00a6 1363 return ntohl(*((uint32_t *)((char *)index + (24 * mi))));
1f688557
JH
1364 if (cmp > 0)
1365 hi = mi;
1366 else
1367 lo = mi+1;
1368 } while (lo < hi);
1369 return 0;
1370}
1371
d4ff6d92
SP
1372static int matches_pack_name(struct packed_git *p, const char *ig)
1373{
1374 const char *last_c, *c;
1375
1376 if (!strcmp(p->pack_name, ig))
1377 return 0;
1378
1379 for (c = p->pack_name, last_c = c; *c;)
1380 if (*c == '/')
1381 last_c = ++c;
1382 else
1383 ++c;
1384 if (!strcmp(last_c, ig))
1385 return 0;
1386
1387 return 1;
1388}
1389
106d710b 1390static int find_pack_entry(const unsigned char *sha1, struct pack_entry *e, const char **ignore_packed)
1f688557
JH
1391{
1392 struct packed_git *p;
43057304
NP
1393 unsigned long offset;
1394
1f688557
JH
1395 prepare_packed_git();
1396
1397 for (p = packed_git; p; p = p->next) {
106d710b
JH
1398 if (ignore_packed) {
1399 const char **ig;
1400 for (ig = ignore_packed; *ig; ig++)
d4ff6d92 1401 if (!matches_pack_name(p, *ig))
106d710b
JH
1402 break;
1403 if (*ig)
1404 continue;
1405 }
43057304
NP
1406 offset = find_pack_entry_one(sha1, p);
1407 if (offset) {
1408 e->offset = offset;
1409 e->p = p;
1410 hashcpy(e->sha1, sha1);
1f688557 1411 return 1;
43057304 1412 }
1f688557
JH
1413 }
1414 return 0;
1415}
1416
bf592c50
DB
1417struct packed_git *find_sha1_pack(const unsigned char *sha1,
1418 struct packed_git *packs)
1419{
1420 struct packed_git *p;
bf592c50
DB
1421
1422 for (p = packs; p; p = p->next) {
43057304 1423 if (find_pack_entry_one(sha1, p))
bf592c50
DB
1424 return p;
1425 }
1426 return NULL;
1427
1428}
1429
f0df4ed5 1430static int sha1_loose_object_info(const unsigned char *sha1, char *type, unsigned long *sizep)
65c2e0c3 1431{
36e4d74a 1432 int status;
65c2e0c3
JH
1433 unsigned long mapsize, size;
1434 void *map;
1435 z_stream stream;
36e4d74a 1436 char hdr[128];
65c2e0c3 1437
bb6b8e4f 1438 map = map_sha1_file(sha1, &mapsize);
f0df4ed5
JS
1439 if (!map)
1440 return error("unable to find %s", sha1_to_hex(sha1));
36e4d74a
JH
1441 if (unpack_sha1_header(&stream, map, mapsize, hdr, sizeof(hdr)) < 0)
1442 status = error("unable to unpack %s header",
1443 sha1_to_hex(sha1));
1444 if (parse_sha1_header(hdr, type, &size) < 0)
1445 status = error("unable to parse %s header", sha1_to_hex(sha1));
c4584ae3 1446 else {
65c2e0c3 1447 status = 0;
c62266f3
JH
1448 if (sizep)
1449 *sizep = size;
65c2e0c3 1450 }
65c2e0c3
JH
1451 inflateEnd(&stream);
1452 munmap(map, mapsize);
1453 return status;
1454}
1455
f0df4ed5
JS
1456int sha1_object_info(const unsigned char *sha1, char *type, unsigned long *sizep)
1457{
f0df4ed5
JS
1458 struct pack_entry e;
1459
1460 if (!find_pack_entry(sha1, &e, NULL)) {
1461 reprepare_packed_git();
1462 if (!find_pack_entry(sha1, &e, NULL))
1463 return sha1_loose_object_info(sha1, type, sizep);
1464 }
03e79c88 1465 return packed_object_info(e.p, e.offset, type, sizep);
f0df4ed5
JS
1466}
1467
1f688557
JH
1468static void *read_packed_sha1(const unsigned char *sha1, char *type, unsigned long *size)
1469{
1470 struct pack_entry e;
1471
106d710b 1472 if (!find_pack_entry(sha1, &e, NULL)) {
1f688557
JH
1473 error("cannot read sha1_file for %s", sha1_to_hex(sha1));
1474 return NULL;
1475 }
4d703a1a 1476 return unpack_entry(e.p, e.offset, type, size);
1f688557
JH
1477}
1478
0fcfd160
LT
1479void * read_sha1_file(const unsigned char *sha1, char *type, unsigned long *size)
1480{
1481 unsigned long mapsize;
1482 void *map, *buf;
ab90ea5d 1483 struct pack_entry e;
0fcfd160 1484
106d710b 1485 if (find_pack_entry(sha1, &e, NULL))
ab90ea5d 1486 return read_packed_sha1(sha1, type, size);
bb6b8e4f 1487 map = map_sha1_file(sha1, &mapsize);
0fcfd160
LT
1488 if (map) {
1489 buf = unpack_sha1_file(map, mapsize, type, size);
1490 munmap(map, mapsize);
1491 return buf;
1492 }
637cdd9d 1493 reprepare_packed_git();
106d710b 1494 if (find_pack_entry(sha1, &e, NULL))
637cdd9d 1495 return read_packed_sha1(sha1, type, size);
ab90ea5d 1496 return NULL;
0fcfd160
LT
1497}
1498
40469ee9 1499void *read_object_with_reference(const unsigned char *sha1,
bf0f910d 1500 const char *required_type,
40469ee9
JH
1501 unsigned long *size,
1502 unsigned char *actual_sha1_return)
f4913f91
JH
1503{
1504 char type[20];
1505 void *buffer;
1506 unsigned long isize;
40469ee9 1507 unsigned char actual_sha1[20];
f4913f91 1508
e702496e 1509 hashcpy(actual_sha1, sha1);
40469ee9
JH
1510 while (1) {
1511 int ref_length = -1;
1512 const char *ref_type = NULL;
f4913f91 1513
40469ee9
JH
1514 buffer = read_sha1_file(actual_sha1, type, &isize);
1515 if (!buffer)
1516 return NULL;
1517 if (!strcmp(type, required_type)) {
1518 *size = isize;
1519 if (actual_sha1_return)
e702496e 1520 hashcpy(actual_sha1_return, actual_sha1);
40469ee9
JH
1521 return buffer;
1522 }
1523 /* Handle references */
8e440259 1524 else if (!strcmp(type, commit_type))
40469ee9 1525 ref_type = "tree ";
8e440259 1526 else if (!strcmp(type, tag_type))
40469ee9
JH
1527 ref_type = "object ";
1528 else {
1529 free(buffer);
1530 return NULL;
1531 }
1532 ref_length = strlen(ref_type);
f4913f91 1533
40469ee9 1534 if (memcmp(buffer, ref_type, ref_length) ||
1d7f171c 1535 get_sha1_hex((char *) buffer + ref_length, actual_sha1)) {
40469ee9
JH
1536 free(buffer);
1537 return NULL;
1538 }
1cf58e72 1539 free(buffer);
40469ee9
JH
1540 /* Now we have the ID of the referred-to object in
1541 * actual_sha1. Check again. */
f4913f91 1542 }
f4913f91
JH
1543}
1544
972a9155
RS
1545static void write_sha1_file_prepare(void *buf, unsigned long len,
1546 const char *type, unsigned char *sha1,
1547 unsigned char *hdr, int *hdrlen)
d410c0f5
JH
1548{
1549 SHA_CTX c;
1550
1551 /* Generate the header */
1552 *hdrlen = sprintf((char *)hdr, "%s %lu", type, len)+1;
1553
1554 /* Sha1.. */
1555 SHA1_Init(&c);
1556 SHA1_Update(&c, hdr, *hdrlen);
1557 SHA1_Update(&c, buf, len);
1558 SHA1_Final(sha1, &c);
d410c0f5
JH
1559}
1560
230f1322
LT
1561/*
1562 * Link the tempfile to the final place, possibly creating the
1563 * last directory level as you do so.
1564 *
1565 * Returns the errno on failure, 0 on success.
1566 */
839837b9 1567static int link_temp_to_file(const char *tmpfile, const char *filename)
230f1322
LT
1568{
1569 int ret;
756aaf4a 1570 char *dir;
230f1322
LT
1571
1572 if (!link(tmpfile, filename))
1573 return 0;
1574
1575 /*
756aaf4a 1576 * Try to mkdir the last path component if that failed.
230f1322
LT
1577 *
1578 * Re-try the "link()" regardless of whether the mkdir
1579 * succeeds, since a race might mean that somebody
1580 * else succeeded.
1581 */
1582 ret = errno;
756aaf4a
SP
1583 dir = strrchr(filename, '/');
1584 if (dir) {
1585 *dir = 0;
866cae0d 1586 if (!mkdir(filename, 0777) && adjust_shared_perm(filename)) {
91c23e48 1587 *dir = '/';
756aaf4a 1588 return -2;
91c23e48 1589 }
756aaf4a
SP
1590 *dir = '/';
1591 if (!link(tmpfile, filename))
1592 return 0;
1593 ret = errno;
230f1322
LT
1594 }
1595 return ret;
1596}
1597
1598/*
1599 * Move the just written object into its final resting place
1600 */
839837b9 1601int move_temp_to_file(const char *tmpfile, const char *filename)
230f1322
LT
1602{
1603 int ret = link_temp_to_file(tmpfile, filename);
7ebb6fca
LT
1604
1605 /*
1606 * Coda hack - coda doesn't like cross-directory links,
1607 * so we fall back to a rename, which will mean that it
1608 * won't be able to check collisions, but that's not a
1609 * big deal.
1610 *
1611 * The same holds for FAT formatted media.
1612 *
1613 * When this succeeds, we just return 0. We have nothing
1614 * left to unlink.
1615 */
1616 if (ret && ret != EEXIST) {
1617 if (!rename(tmpfile, filename))
230f1322 1618 return 0;
9e48b389 1619 ret = errno;
230f1322
LT
1620 }
1621 unlink(tmpfile);
1622 if (ret) {
1623 if (ret != EEXIST) {
916d081b 1624 return error("unable to write sha1 filename %s: %s\n", filename, strerror(ret));
230f1322
LT
1625 }
1626 /* FIXME!!! Collision check here ? */
1627 }
1628
1629 return 0;
1630}
1631
4d548150
LT
1632static int write_buffer(int fd, const void *buf, size_t len)
1633{
d34cf19b 1634 if (write_in_full(fd, buf, len) < 0)
93822c22 1635 return error("file write error (%s)", strerror(errno));
4d548150
LT
1636 return 0;
1637}
1638
93821bd9
LT
1639static int write_binary_header(unsigned char *hdr, enum object_type type, unsigned long len)
1640{
1641 int hdr_len;
1642 unsigned char c;
1643
1644 c = (type << 4) | (len & 15);
1645 len >>= 4;
1646 hdr_len = 1;
1647 while (len) {
1648 *hdr++ = c | 0x80;
1649 hdr_len++;
1650 c = (len & 0x7f);
1651 len >>= 7;
1652 }
1653 *hdr = c;
1654 return hdr_len;
1655}
1656
1657static void setup_object_header(z_stream *stream, const char *type, unsigned long len)
1658{
1659 int obj_type, hdr;
1660
1661 if (use_legacy_headers) {
1662 while (deflate(stream, 0) == Z_OK)
1663 /* nothing */;
1664 return;
1665 }
1666 if (!strcmp(type, blob_type))
1667 obj_type = OBJ_BLOB;
1668 else if (!strcmp(type, tree_type))
1669 obj_type = OBJ_TREE;
1670 else if (!strcmp(type, commit_type))
1671 obj_type = OBJ_COMMIT;
1672 else if (!strcmp(type, tag_type))
1673 obj_type = OBJ_TAG;
1674 else
1675 die("trying to generate bogus object of type '%s'", type);
1676 hdr = write_binary_header(stream->next_out, obj_type, len);
1677 stream->total_out = hdr;
1678 stream->next_out += hdr;
1679 stream->avail_out -= hdr;
1680}
1681
abdc3fc8
RS
1682int hash_sha1_file(void *buf, unsigned long len, const char *type,
1683 unsigned char *sha1)
1684{
1685 unsigned char hdr[50];
1686 int hdrlen;
1687 write_sha1_file_prepare(buf, len, type, sha1, hdr, &hdrlen);
1688 return 0;
1689}
1690
bf0f910d 1691int write_sha1_file(void *buf, unsigned long len, const char *type, unsigned char *returnsha1)
0fcfd160
LT
1692{
1693 int size;
bf0f910d 1694 unsigned char *compressed;
0fcfd160
LT
1695 z_stream stream;
1696 unsigned char sha1[20];
706bc531 1697 char *filename;
aac17941 1698 static char tmpfile[PATH_MAX];
bf0f910d 1699 unsigned char hdr[50];
230f1322 1700 int fd, hdrlen;
a44c9a5e 1701
d410c0f5
JH
1702 /* Normally if we have it in the pack then we do not bother writing
1703 * it out into .git/objects/??/?{38} file.
1704 */
972a9155
RS
1705 write_sha1_file_prepare(buf, len, type, sha1, hdr, &hdrlen);
1706 filename = sha1_file_name(sha1);
706bc531 1707 if (returnsha1)
e702496e 1708 hashcpy(returnsha1, sha1);
d410c0f5
JH
1709 if (has_sha1_file(sha1))
1710 return 0;
aac17941
LT
1711 fd = open(filename, O_RDONLY);
1712 if (fd >= 0) {
706bc531 1713 /*
aac17941
LT
1714 * FIXME!!! We might do collision checking here, but we'd
1715 * need to uncompress the old file and check it. Later.
706bc531 1716 */
aac17941 1717 close(fd);
706bc531
LT
1718 return 0;
1719 }
1720
aac17941 1721 if (errno != ENOENT) {
916d081b 1722 return error("sha1 file %s: %s\n", filename, strerror(errno));
aac17941
LT
1723 }
1724
1725 snprintf(tmpfile, sizeof(tmpfile), "%s/obj_XXXXXX", get_object_directory());
ace1534d 1726
aac17941
LT
1727 fd = mkstemp(tmpfile);
1728 if (fd < 0) {
916d081b
PB
1729 if (errno == EPERM)
1730 return error("insufficient permission for adding an object to repository database %s\n", get_object_directory());
1731 else
1732 return error("unable to create temporary sha1 filename %s: %s\n", tmpfile, strerror(errno));
aac17941
LT
1733 }
1734
0fcfd160
LT
1735 /* Set it up */
1736 memset(&stream, 0, sizeof(stream));
12f6c308 1737 deflateInit(&stream, zlib_compression_level);
93821bd9 1738 size = 8 + deflateBound(&stream, len+hdrlen);
812666c8 1739 compressed = xmalloc(size);
0fcfd160
LT
1740
1741 /* Compress it */
0fcfd160
LT
1742 stream.next_out = compressed;
1743 stream.avail_out = size;
a44c9a5e
LT
1744
1745 /* First header.. */
1746 stream.next_in = hdr;
1747 stream.avail_in = hdrlen;
93821bd9 1748 setup_object_header(&stream, type, len);
a44c9a5e
LT
1749
1750 /* Then the data itself.. */
1751 stream.next_in = buf;
1752 stream.avail_in = len;
0fcfd160
LT
1753 while (deflate(&stream, Z_FINISH) == Z_OK)
1754 /* nothing */;
1755 deflateEnd(&stream);
1756 size = stream.total_out;
1757
4d548150
LT
1758 if (write_buffer(fd, compressed, size) < 0)
1759 die("unable to write sha1 file");
aac17941 1760 fchmod(fd, 0444);
706bc531 1761 close(fd);
383f85b7 1762 free(compressed);
0fcfd160 1763
230f1322 1764 return move_temp_to_file(tmpfile, filename);
0fcfd160 1765}
8237b185 1766
4d548150
LT
1767/*
1768 * We need to unpack and recompress the object for writing
1769 * it out to a different file.
1770 */
1771static void *repack_object(const unsigned char *sha1, unsigned long *objsize)
a5eda52b 1772{
4d548150 1773 size_t size;
a5eda52b 1774 z_stream stream;
4d548150
LT
1775 unsigned char *unpacked;
1776 unsigned long len;
1777 char type[20];
1778 char hdr[50];
1779 int hdrlen;
1780 void *buf;
bfc66daf 1781
a9486b02 1782 /* need to unpack and recompress it by itself */
4d548150 1783 unpacked = read_packed_sha1(sha1, type, &len);
a5eda52b 1784
4d548150 1785 hdrlen = sprintf(hdr, "%s %lu", type, len) + 1;
a5eda52b 1786
4d548150
LT
1787 /* Set it up */
1788 memset(&stream, 0, sizeof(stream));
12f6c308 1789 deflateInit(&stream, zlib_compression_level);
4d548150
LT
1790 size = deflateBound(&stream, len + hdrlen);
1791 buf = xmalloc(size);
a5eda52b 1792
4d548150
LT
1793 /* Compress it */
1794 stream.next_out = buf;
1795 stream.avail_out = size;
a5eda52b 1796
4d548150
LT
1797 /* First header.. */
1798 stream.next_in = (void *)hdr;
1799 stream.avail_in = hdrlen;
1800 while (deflate(&stream, 0) == Z_OK)
1801 /* nothing */;
bfc66daf 1802
4d548150
LT
1803 /* Then the data itself.. */
1804 stream.next_in = unpacked;
1805 stream.avail_in = len;
1806 while (deflate(&stream, Z_FINISH) == Z_OK)
1807 /* nothing */;
1808 deflateEnd(&stream);
1809 free(unpacked);
bfc66daf 1810
4d548150
LT
1811 *objsize = stream.total_out;
1812 return buf;
1813}
1814
1815int write_sha1_to_fd(int fd, const unsigned char *sha1)
1816{
1817 int retval;
1818 unsigned long objsize;
bb6b8e4f 1819 void *buf = map_sha1_file(sha1, &objsize);
4d548150
LT
1820
1821 if (buf) {
1822 retval = write_buffer(fd, buf, objsize);
1823 munmap(buf, objsize);
1824 return retval;
1825 }
1826
1827 buf = repack_object(sha1, &objsize);
1828 retval = write_buffer(fd, buf, objsize);
1829 free(buf);
1830 return retval;
a5eda52b
DB
1831}
1832
70b9829e
DB
1833int write_sha1_from_fd(const unsigned char *sha1, int fd, char *buffer,
1834 size_t bufsize, size_t *bufposn)
8237b185 1835{
230f1322 1836 char tmpfile[PATH_MAX];
8237b185
DB
1837 int local;
1838 z_stream stream;
1839 unsigned char real_sha1[20];
bf0f910d 1840 unsigned char discard[4096];
8237b185
DB
1841 int ret;
1842 SHA_CTX c;
1843
230f1322 1844 snprintf(tmpfile, sizeof(tmpfile), "%s/obj_XXXXXX", get_object_directory());
8237b185 1845
230f1322 1846 local = mkstemp(tmpfile);
916d081b
PB
1847 if (local < 0) {
1848 if (errno == EPERM)
1849 return error("insufficient permission for adding an object to repository database %s\n", get_object_directory());
1850 else
1851 return error("unable to create temporary sha1 filename %s: %s\n", tmpfile, strerror(errno));
1852 }
8237b185
DB
1853
1854 memset(&stream, 0, sizeof(stream));
1855
1856 inflateInit(&stream);
1857
1858 SHA1_Init(&c);
1859
1860 do {
1861 ssize_t size;
70b9829e
DB
1862 if (*bufposn) {
1863 stream.avail_in = *bufposn;
96ad15ae 1864 stream.next_in = (unsigned char *) buffer;
70b9829e
DB
1865 do {
1866 stream.next_out = discard;
1867 stream.avail_out = sizeof(discard);
1868 ret = inflate(&stream, Z_SYNC_FLUSH);
1869 SHA1_Update(&c, discard, sizeof(discard) -
1870 stream.avail_out);
1871 } while (stream.avail_in && ret == Z_OK);
4d548150
LT
1872 if (write_buffer(local, buffer, *bufposn - stream.avail_in) < 0)
1873 die("unable to write sha1 file");
70b9829e
DB
1874 memmove(buffer, buffer + *bufposn - stream.avail_in,
1875 stream.avail_in);
1876 *bufposn = stream.avail_in;
1877 if (ret != Z_OK)
1878 break;
1879 }
93d26e4c 1880 size = xread(fd, buffer + *bufposn, bufsize - *bufposn);
8237b185
DB
1881 if (size <= 0) {
1882 close(local);
230f1322 1883 unlink(tmpfile);
8237b185
DB
1884 if (!size)
1885 return error("Connection closed?");
1886 perror("Reading from connection");
1887 return -1;
1888 }
70b9829e
DB
1889 *bufposn += size;
1890 } while (1);
8237b185
DB
1891 inflateEnd(&stream);
1892
1893 close(local);
1894 SHA1_Final(real_sha1, &c);
1895 if (ret != Z_STREAM_END) {
230f1322 1896 unlink(tmpfile);
8237b185
DB
1897 return error("File %s corrupted", sha1_to_hex(sha1));
1898 }
a89fccd2 1899 if (hashcmp(sha1, real_sha1)) {
230f1322 1900 unlink(tmpfile);
bd2afde8 1901 return error("File %s has bad hash", sha1_to_hex(sha1));
8237b185 1902 }
230f1322
LT
1903
1904 return move_temp_to_file(tmpfile, sha1_file_name(sha1));
8237b185
DB
1905}
1906
bf592c50
DB
1907int has_pack_index(const unsigned char *sha1)
1908{
1909 struct stat st;
1910 if (stat(sha1_pack_index_name(sha1), &st))
1911 return 0;
1912 return 1;
1913}
1914
1915int has_pack_file(const unsigned char *sha1)
1916{
1917 struct stat st;
1918 if (stat(sha1_pack_name(sha1), &st))
1919 return 0;
1920 return 1;
1921}
1922
106d710b 1923int has_sha1_pack(const unsigned char *sha1, const char **ignore_packed)
dade09c2
LT
1924{
1925 struct pack_entry e;
106d710b 1926 return find_pack_entry(sha1, &e, ignore_packed);
dade09c2
LT
1927}
1928
8237b185
DB
1929int has_sha1_file(const unsigned char *sha1)
1930{
8237b185 1931 struct stat st;
1f688557
JH
1932 struct pack_entry e;
1933
106d710b 1934 if (find_pack_entry(sha1, &e, NULL))
1f688557 1935 return 1;
ab90ea5d 1936 return find_sha1_file(sha1, &st) ? 1 : 0;
8237b185 1937}
74400e71 1938
e7332f96
BE
1939/*
1940 * reads from fd as long as possible into a supplied buffer of size bytes.
82e5a82f 1941 * If necessary the buffer's size is increased using realloc()
e7332f96
BE
1942 *
1943 * returns 0 if anything went fine and -1 otherwise
1944 *
1945 * NOTE: both buf and size may change, but even when -1 is returned
1946 * you still have to free() it yourself.
1947 */
1948int read_pipe(int fd, char** return_buf, unsigned long* return_size)
024510c8 1949{
e7332f96
BE
1950 char* buf = *return_buf;
1951 unsigned long size = *return_size;
1952 int iret;
024510c8 1953 unsigned long off = 0;
e7332f96 1954
024510c8 1955 do {
e7332f96 1956 iret = xread(fd, buf + off, size - off);
024510c8
DB
1957 if (iret > 0) {
1958 off += iret;
1959 if (off == size) {
1960 size *= 2;
83572c1a 1961 buf = xrealloc(buf, size);
024510c8
DB
1962 }
1963 }
1964 } while (iret > 0);
e7332f96
BE
1965
1966 *return_buf = buf;
1967 *return_size = off;
1968
1969 if (iret < 0)
1970 return -1;
1971 return 0;
1972}
1973
1974int index_pipe(unsigned char *sha1, int fd, const char *type, int write_object)
1975{
1976 unsigned long size = 4096;
2d7320d0 1977 char *buf = xmalloc(size);
e7332f96 1978 int ret;
e7332f96
BE
1979
1980 if (read_pipe(fd, &buf, &size)) {
024510c8
DB
1981 free(buf);
1982 return -1;
1983 }
e7332f96 1984
024510c8 1985 if (!type)
8e440259 1986 type = blob_type;
024510c8 1987 if (write_object)
e7332f96 1988 ret = write_sha1_file(buf, size, type, sha1);
abdc3fc8
RS
1989 else
1990 ret = hash_sha1_file(buf, size, type, sha1);
024510c8
DB
1991 free(buf);
1992 return ret;
1993}
1994
7672db20 1995int index_fd(unsigned char *sha1, int fd, struct stat *st, int write_object, const char *type)
74400e71 1996{
74400e71 1997 unsigned long size = st->st_size;
aac17941
LT
1998 void *buf;
1999 int ret;
74400e71 2000
aac17941 2001 buf = "";
74400e71 2002 if (size)
c4712e45 2003 buf = xmmap(NULL, size, PROT_READ, MAP_PRIVATE, fd, 0);
74400e71 2004 close(fd);
74400e71 2005
7672db20 2006 if (!type)
8e440259 2007 type = blob_type;
7672db20
BL
2008 if (write_object)
2009 ret = write_sha1_file(buf, size, type, sha1);
abdc3fc8
RS
2010 else
2011 ret = hash_sha1_file(buf, size, type, sha1);
aac17941
LT
2012 if (size)
2013 munmap(buf, size);
2014 return ret;
74400e71 2015}
ec1fcc16
JH
2016
2017int index_path(unsigned char *sha1, const char *path, struct stat *st, int write_object)
2018{
2019 int fd;
2020 char *target;
2021
2022 switch (st->st_mode & S_IFMT) {
2023 case S_IFREG:
2024 fd = open(path, O_RDONLY);
2025 if (fd < 0)
2026 return error("open(\"%s\"): %s", path,
2027 strerror(errno));
2028 if (index_fd(sha1, fd, st, write_object, NULL) < 0)
2029 return error("%s: failed to insert into database",
2030 path);
2031 break;
2032 case S_IFLNK:
2033 target = xmalloc(st->st_size+1);
2034 if (readlink(path, target, st->st_size+1) != st->st_size) {
2035 char *errstr = strerror(errno);
2036 free(target);
2037 return error("readlink(\"%s\"): %s", path,
2038 errstr);
2039 }
abdc3fc8
RS
2040 if (!write_object)
2041 hash_sha1_file(target, st->st_size, blob_type, sha1);
2042 else if (write_sha1_file(target, st->st_size, blob_type, sha1))
ec1fcc16
JH
2043 return error("%s: failed to insert into database",
2044 path);
2045 free(target);
2046 break;
2047 default:
2048 return error("%s: unsupported file type", path);
2049 }
2050 return 0;
2051}