Merge branch 'nh/http'
[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
88cd621d
JH
25const unsigned char null_sha1[20] = { 0, };
26
144bde78
LT
27static unsigned int sha1_file_open_flag = O_NOATIME;
28
0fcfd160
LT
29static unsigned hexval(char c)
30{
31 if (c >= '0' && c <= '9')
32 return c - '0';
33 if (c >= 'a' && c <= 'f')
34 return c - 'a' + 10;
35 if (c >= 'A' && c <= 'F')
36 return c - 'A' + 10;
37 return ~0;
38}
39
40int get_sha1_hex(const char *hex, unsigned char *sha1)
41{
42 int i;
43 for (i = 0; i < 20; i++) {
44 unsigned int val = (hexval(hex[0]) << 4) | hexval(hex[1]);
45 if (val & ~0xff)
46 return -1;
47 *sha1++ = val;
48 hex += 2;
49 }
50 return 0;
51}
52
457f06d6
JS
53int adjust_shared_perm(const char *path)
54{
55 struct stat st;
56 int mode;
57
58 if (!shared_repository)
59 return 0;
60 if (lstat(path, &st) < 0)
61 return -1;
62 mode = st.st_mode;
63 if (mode & S_IRUSR)
64 mode |= S_IRGRP;
65 if (mode & S_IWUSR)
66 mode |= S_IWGRP;
67 if (mode & S_IXUSR)
68 mode |= S_IXGRP;
69 if (S_ISDIR(mode))
70 mode |= S_ISGID;
71 if (chmod(path, mode) < 0)
72 return -2;
73 return 0;
74}
75
b2cb9425
JH
76int safe_create_leading_directories(char *path)
77{
78 char *pos = path;
67d42212
JR
79 struct stat st;
80
67ffdf4c
JS
81 if (*pos == '/')
82 pos++;
b2cb9425
JH
83
84 while (pos) {
85 pos = strchr(pos, '/');
86 if (!pos)
87 break;
88 *pos = 0;
67d42212
JR
89 if (!stat(path, &st)) {
90 /* path exists */
91 if (!S_ISDIR(st.st_mode)) {
b2cb9425 92 *pos = '/';
67d42212 93 return -3;
b2cb9425 94 }
457f06d6 95 }
67d42212
JR
96 else if (mkdir(path, 0777)) {
97 *pos = '/';
98 return -1;
99 }
457f06d6
JS
100 else if (adjust_shared_perm(path)) {
101 *pos = '/';
102 return -2;
103 }
b2cb9425
JH
104 *pos++ = '/';
105 }
106 return 0;
107}
723c31fe 108
0fcfd160
LT
109char * sha1_to_hex(const unsigned char *sha1)
110{
dcb3450f
LT
111 static int bufno;
112 static char hexbuffer[4][50];
0fcfd160 113 static const char hex[] = "0123456789abcdef";
dcb3450f 114 char *buffer = hexbuffer[3 & ++bufno], *buf = buffer;
0fcfd160
LT
115 int i;
116
117 for (i = 0; i < 20; i++) {
118 unsigned int val = *sha1++;
119 *buf++ = hex[val >> 4];
120 *buf++ = hex[val & 0xf];
121 }
1e80e044
JS
122 *buf = '\0';
123
0fcfd160
LT
124 return buffer;
125}
126
ace1534d
JH
127static void fill_sha1_path(char *pathbuf, const unsigned char *sha1)
128{
129 int i;
130 for (i = 0; i < 20; i++) {
131 static char hex[] = "0123456789abcdef";
132 unsigned int val = sha1[i];
133 char *pos = pathbuf + i*2 + (i > 0);
134 *pos++ = hex[val >> 4];
135 *pos = hex[val & 0xf];
136 }
137}
138
0fcfd160
LT
139/*
140 * NOTE! This returns a statically allocated buffer, so you have to be
141 * careful about using it. Do a "strdup()" if you need to save the
142 * filename.
ace1534d
JH
143 *
144 * Also note that this returns the location for creating. Reading
145 * SHA1 file can happen from any alternate directory listed in the
d19938ab 146 * DB_ENVIRONMENT environment variable if it is not found in
ace1534d 147 * the primary object database.
0fcfd160
LT
148 */
149char *sha1_file_name(const unsigned char *sha1)
150{
0fcfd160
LT
151 static char *name, *base;
152
153 if (!base) {
d19938ab 154 const char *sha1_file_directory = get_object_directory();
0fcfd160 155 int len = strlen(sha1_file_directory);
812666c8 156 base = xmalloc(len + 60);
0fcfd160
LT
157 memcpy(base, sha1_file_directory, len);
158 memset(base+len, 0, 60);
159 base[len] = '/';
160 base[len+3] = '/';
161 name = base + len + 1;
162 }
ace1534d 163 fill_sha1_path(name, sha1);
0fcfd160
LT
164 return base;
165}
166
bf592c50
DB
167char *sha1_pack_name(const unsigned char *sha1)
168{
169 static const char hex[] = "0123456789abcdef";
170 static char *name, *base, *buf;
171 int i;
172
173 if (!base) {
174 const char *sha1_file_directory = get_object_directory();
175 int len = strlen(sha1_file_directory);
176 base = xmalloc(len + 60);
177 sprintf(base, "%s/pack/pack-1234567890123456789012345678901234567890.pack", sha1_file_directory);
178 name = base + len + 11;
179 }
180
181 buf = name;
182
183 for (i = 0; i < 20; i++) {
184 unsigned int val = *sha1++;
185 *buf++ = hex[val >> 4];
186 *buf++ = hex[val & 0xf];
187 }
188
189 return base;
190}
191
192char *sha1_pack_index_name(const unsigned char *sha1)
193{
194 static const char hex[] = "0123456789abcdef";
195 static char *name, *base, *buf;
196 int i;
197
198 if (!base) {
199 const char *sha1_file_directory = get_object_directory();
200 int len = strlen(sha1_file_directory);
201 base = xmalloc(len + 60);
202 sprintf(base, "%s/pack/pack-1234567890123456789012345678901234567890.idx", sha1_file_directory);
203 name = base + len + 11;
204 }
205
206 buf = name;
207
208 for (i = 0; i < 20; i++) {
209 unsigned int val = *sha1++;
210 *buf++ = hex[val >> 4];
211 *buf++ = hex[val & 0xf];
212 }
213
214 return base;
215}
216
d5a63b99
JH
217struct alternate_object_database *alt_odb_list;
218static struct alternate_object_database **alt_odb_tail;
ace1534d 219
c2f493a4
MW
220static void read_info_alternates(const char * alternates, int depth);
221
ddd5d056
JH
222/*
223 * Prepare alternate object database registry.
d5a63b99
JH
224 *
225 * The variable alt_odb_list points at the list of struct
226 * alternate_object_database. The elements on this list come from
227 * non-empty elements from colon separated ALTERNATE_DB_ENVIRONMENT
228 * environment variable, and $GIT_OBJECT_DIRECTORY/info/alternates,
1494e038
JH
229 * whose contents is similar to that environment variable but can be
230 * LF separated. Its base points at a statically allocated buffer that
d5a63b99
JH
231 * contains "/the/directory/corresponding/to/.git/objects/...", while
232 * its name points just after the slash at the end of ".git/objects/"
233 * in the example above, and has enough space to hold 40-byte hex
234 * SHA1, an extra slash for the first level indirection, and the
235 * terminating NUL.
ddd5d056 236 */
c2f493a4 237static int link_alt_odb_entry(const char * entry, int len, const char * relative_base, int depth)
ace1534d 238{
c2f493a4 239 struct stat st;
1494e038 240 const char *objdir = get_object_directory();
c2f493a4
MW
241 struct alternate_object_database *ent;
242 struct alternate_object_database *alt;
243 /* 43 = 40-byte + 2 '/' + terminating NUL */
244 int pfxlen = len;
245 int entlen = pfxlen + 43;
ccfd3e99 246 int base_len = -1;
d5a63b99 247
c2f493a4
MW
248 if (*entry != '/' && relative_base) {
249 /* Relative alt-odb */
250 if (base_len < 0)
251 base_len = strlen(relative_base) + 1;
252 entlen += base_len;
253 pfxlen += base_len;
254 }
255 ent = xmalloc(sizeof(*ent) + entlen);
256
257 if (*entry != '/' && relative_base) {
258 memcpy(ent->base, relative_base, base_len - 1);
259 ent->base[base_len - 1] = '/';
260 memcpy(ent->base + base_len, entry, len);
261 }
262 else
263 memcpy(ent->base, entry, pfxlen);
264
265 ent->name = ent->base + pfxlen + 1;
266 ent->base[pfxlen + 3] = '/';
267 ent->base[pfxlen] = ent->base[entlen-1] = 0;
268
269 /* Detect cases where alternate disappeared */
270 if (stat(ent->base, &st) || !S_ISDIR(st.st_mode)) {
271 error("object directory %s does not exist; "
272 "check .git/objects/info/alternates.",
273 ent->base);
274 free(ent);
275 return -1;
276 }
277
278 /* Prevent the common mistake of listing the same
279 * thing twice, or object directory itself.
280 */
281 for (alt = alt_odb_list; alt; alt = alt->next) {
282 if (!memcmp(ent->base, alt->base, pfxlen)) {
283 free(ent);
284 return -1;
285 }
286 }
287 if (!memcmp(ent->base, objdir, pfxlen)) {
288 free(ent);
289 return -1;
290 }
291
292 /* add the alternate entry */
293 *alt_odb_tail = ent;
294 alt_odb_tail = &(ent->next);
295 ent->next = NULL;
296
297 /* recursively add alternates */
298 read_info_alternates(ent->base, depth + 1);
299
300 ent->base[pfxlen] = '/';
301
302 return 0;
303}
304
305static void link_alt_odb_entries(const char *alt, const char *ep, int sep,
306 const char *relative_base, int depth)
307{
308 const char *cp, *last;
309
310 if (depth > 5) {
311 error("%s: ignoring alternate object stores, nesting too deep.",
312 relative_base);
313 return;
314 }
315
d5a63b99 316 last = alt;
9577e7e3
JH
317 while (last < ep) {
318 cp = last;
319 if (cp < ep && *cp == '#') {
320 while (cp < ep && *cp != sep)
321 cp++;
322 last = cp + 1;
323 continue;
324 }
c2f493a4
MW
325 while (cp < ep && *cp != sep)
326 cp++;
d5a63b99 327 if (last != cp) {
c2f493a4
MW
328 if ((*last != '/') && depth) {
329 error("%s: ignoring relative alternate object store %s",
330 relative_base, last);
331 } else {
332 link_alt_odb_entry(last, cp - last,
333 relative_base, depth);
1494e038 334 }
d5a63b99 335 }
9577e7e3 336 while (cp < ep && *cp == sep)
d5a63b99
JH
337 cp++;
338 last = cp;
9577e7e3 339 }
d5a63b99
JH
340}
341
c2f493a4 342static void read_info_alternates(const char * relative_base, int depth)
d5a63b99 343{
9577e7e3 344 char *map;
d5a63b99 345 struct stat st;
c2f493a4
MW
346 char path[PATH_MAX];
347 int fd;
d5a63b99 348
c2f493a4 349 sprintf(path, "%s/info/alternates", relative_base);
d5a63b99
JH
350 fd = open(path, O_RDONLY);
351 if (fd < 0)
352 return;
353 if (fstat(fd, &st) || (st.st_size == 0)) {
354 close(fd);
9a217f2a 355 return;
ace1534d 356 }
d5a63b99
JH
357 map = mmap(NULL, st.st_size, PROT_READ, MAP_PRIVATE, fd, 0);
358 close(fd);
359 if (map == MAP_FAILED)
360 return;
361
c2f493a4
MW
362 link_alt_odb_entries(map, map + st.st_size, '\n', relative_base, depth);
363
d5a63b99 364 munmap(map, st.st_size);
ace1534d
JH
365}
366
c2f493a4
MW
367void prepare_alt_odb(void)
368{
369 char *alt;
370
371 alt = getenv(ALTERNATE_DB_ENVIRONMENT);
372 if (!alt) alt = "";
373
374 if (alt_odb_tail)
375 return;
376 alt_odb_tail = &alt_odb_list;
377 link_alt_odb_entries(alt, alt + strlen(alt), ':', NULL, 0);
378
379 read_info_alternates(get_object_directory(), 0);
380}
381
ace1534d
JH
382static char *find_sha1_file(const unsigned char *sha1, struct stat *st)
383{
ace1534d 384 char *name = sha1_file_name(sha1);
d5a63b99 385 struct alternate_object_database *alt;
ace1534d
JH
386
387 if (!stat(name, st))
388 return name;
9a217f2a 389 prepare_alt_odb();
d5a63b99
JH
390 for (alt = alt_odb_list; alt; alt = alt->next) {
391 name = alt->name;
ace1534d 392 fill_sha1_path(name, sha1);
d5a63b99
JH
393 if (!stat(alt->base, st))
394 return alt->base;
ace1534d
JH
395 }
396 return NULL;
397}
398
1f688557
JH
399#define PACK_MAX_SZ (1<<26)
400static int pack_used_ctr;
401static unsigned long pack_mapped;
9a217f2a 402struct packed_git *packed_git;
1f688557 403
1f688557
JH
404static int check_packed_git_idx(const char *path, unsigned long *idx_size_,
405 void **idx_map_)
406{
407 void *idx_map;
408 unsigned int *index;
409 unsigned long idx_size;
410 int nr, i;
e93ec6f9 411 int fd = open(path, O_RDONLY);
1f688557
JH
412 struct stat st;
413 if (fd < 0)
414 return -1;
415 if (fstat(fd, &st)) {
416 close(fd);
417 return -1;
418 }
419 idx_size = st.st_size;
420 idx_map = mmap(NULL, idx_size, PROT_READ, MAP_PRIVATE, fd, 0);
421 close(fd);
422 if (idx_map == MAP_FAILED)
423 return -1;
424
425 index = idx_map;
4d235c80
LT
426 *idx_map_ = idx_map;
427 *idx_size_ = idx_size;
1f688557
JH
428
429 /* check index map */
f9253394 430 if (idx_size < 4*256 + 20 + 20)
1f688557
JH
431 return error("index file too small");
432 nr = 0;
433 for (i = 0; i < 256; i++) {
434 unsigned int n = ntohl(index[i]);
435 if (n < nr)
436 return error("non-monotonic index");
437 nr = n;
438 }
439
440 /*
441 * Total size:
442 * - 256 index entries 4 bytes each
443 * - 24-byte entries * nr (20-byte sha1 + 4-byte offset)
444 * - 20-byte SHA1 of the packfile
445 * - 20-byte SHA1 file checksum
446 */
447 if (idx_size != 4*256 + nr * 24 + 20 + 20)
448 return error("wrong index file size");
449
1f688557
JH
450 return 0;
451}
452
f9253394 453static int unuse_one_packed_git(void)
1f688557 454{
f9253394
JH
455 struct packed_git *p, *lru = NULL;
456
457 for (p = packed_git; p; p = p->next) {
458 if (p->pack_use_cnt || !p->pack_base)
459 continue;
460 if (!lru || p->pack_last_used < lru->pack_last_used)
461 lru = p;
462 }
463 if (!lru)
464 return 0;
465 munmap(lru->pack_base, lru->pack_size);
466 lru->pack_base = NULL;
467 return 1;
468}
469
470void unuse_packed_git(struct packed_git *p)
471{
472 p->pack_use_cnt--;
1f688557
JH
473}
474
f9253394 475int use_packed_git(struct packed_git *p)
1f688557 476{
bf592c50
DB
477 if (!p->pack_size) {
478 struct stat st;
479 // We created the struct before we had the pack
480 stat(p->pack_name, &st);
481 if (!S_ISREG(st.st_mode))
482 die("packfile %s not a regular file", p->pack_name);
483 p->pack_size = st.st_size;
484 }
1f688557
JH
485 if (!p->pack_base) {
486 int fd;
487 struct stat st;
488 void *map;
489
490 pack_mapped += p->pack_size;
f9253394
JH
491 while (PACK_MAX_SZ < pack_mapped && unuse_one_packed_git())
492 ; /* nothing */
1f688557
JH
493 fd = open(p->pack_name, O_RDONLY);
494 if (fd < 0)
f9253394 495 die("packfile %s cannot be opened", p->pack_name);
1f688557
JH
496 if (fstat(fd, &st)) {
497 close(fd);
f9253394 498 die("packfile %s cannot be opened", p->pack_name);
1f688557
JH
499 }
500 if (st.st_size != p->pack_size)
f9253394 501 die("packfile %s size mismatch.", p->pack_name);
1f688557
JH
502 map = mmap(NULL, p->pack_size, PROT_READ, MAP_PRIVATE, fd, 0);
503 close(fd);
504 if (map == MAP_FAILED)
f9253394 505 die("packfile %s cannot be mapped.", p->pack_name);
1f688557 506 p->pack_base = map;
f9253394
JH
507
508 /* Check if the pack file matches with the index file.
509 * this is cheap.
510 */
511 if (memcmp((char*)(p->index_base) + p->index_size - 40,
bf592c50
DB
512 p->pack_base + p->pack_size - 20, 20)) {
513
f9253394 514 die("packfile %s does not match index.", p->pack_name);
bf592c50 515 }
1f688557
JH
516 }
517 p->pack_last_used = pack_used_ctr++;
f9253394 518 p->pack_use_cnt++;
1f688557
JH
519 return 0;
520}
521
9d835df2 522struct packed_git *add_packed_git(char *path, int path_len, int local)
1f688557
JH
523{
524 struct stat st;
525 struct packed_git *p;
526 unsigned long idx_size;
527 void *idx_map;
c0bbbb1b 528 unsigned char sha1[20];
1f688557
JH
529
530 if (check_packed_git_idx(path, &idx_size, &idx_map))
531 return NULL;
532
533 /* do we have a corresponding .pack file? */
534 strcpy(path + path_len - 4, ".pack");
535 if (stat(path, &st) || !S_ISREG(st.st_mode)) {
536 munmap(idx_map, idx_size);
537 return NULL;
538 }
539 /* ok, it looks sane as far as we can check without
540 * actually mapping the pack file.
541 */
542 p = xmalloc(sizeof(*p) + path_len + 2);
543 strcpy(p->pack_name, path);
544 p->index_size = idx_size;
545 p->pack_size = st.st_size;
546 p->index_base = idx_map;
547 p->next = NULL;
d85a4fee 548 p->pack_base = NULL;
1f688557 549 p->pack_last_used = 0;
f9253394 550 p->pack_use_cnt = 0;
9d835df2 551 p->pack_local = local;
f4a11066 552 if ((path_len > 44) && !get_sha1_hex(path + path_len - 44, sha1))
c283ab21 553 memcpy(p->sha1, sha1, 20);
1f688557
JH
554 return p;
555}
556
bf592c50 557struct packed_git *parse_pack_index(unsigned char *sha1)
c508df5e
DB
558{
559 char *path = sha1_pack_index_name(sha1);
560 return parse_pack_index_file(sha1, path);
561}
562
2ab141a2 563struct packed_git *parse_pack_index_file(const unsigned char *sha1, char *idx_path)
bf592c50
DB
564{
565 struct packed_git *p;
566 unsigned long idx_size;
567 void *idx_map;
c508df5e 568 char *path;
bf592c50 569
c508df5e 570 if (check_packed_git_idx(idx_path, &idx_size, &idx_map))
bf592c50
DB
571 return NULL;
572
573 path = sha1_pack_name(sha1);
574
575 p = xmalloc(sizeof(*p) + strlen(path) + 2);
576 strcpy(p->pack_name, path);
577 p->index_size = idx_size;
578 p->pack_size = 0;
579 p->index_base = idx_map;
580 p->next = NULL;
581 p->pack_base = NULL;
582 p->pack_last_used = 0;
583 p->pack_use_cnt = 0;
584 memcpy(p->sha1, sha1, 20);
585 return p;
586}
587
588void install_packed_git(struct packed_git *pack)
589{
590 pack->next = packed_git;
591 packed_git = pack;
592}
593
9d835df2 594static void prepare_packed_git_one(char *objdir, int local)
1f688557
JH
595{
596 char path[PATH_MAX];
597 int len;
598 DIR *dir;
599 struct dirent *de;
600
601 sprintf(path, "%s/pack", objdir);
602 len = strlen(path);
603 dir = opendir(path);
b5b16990 604 if (!dir) {
26125f6b 605 if (errno != ENOENT)
bd2afde8 606 error("unable to open object pack directory: %s: %s",
26125f6b 607 path, strerror(errno));
1f688557 608 return;
b5b16990 609 }
1f688557
JH
610 path[len++] = '/';
611 while ((de = readdir(dir)) != NULL) {
612 int namelen = strlen(de->d_name);
613 struct packed_git *p;
614
615 if (strcmp(de->d_name + namelen - 4, ".idx"))
616 continue;
617
618 /* we have .idx. Is it a file we can map? */
619 strcpy(path + len, de->d_name);
9d835df2 620 p = add_packed_git(path, len + namelen, local);
1f688557
JH
621 if (!p)
622 continue;
623 p->next = packed_git;
624 packed_git = p;
625 }
5b35bcd5 626 closedir(dir);
1f688557
JH
627}
628
9a217f2a 629void prepare_packed_git(void)
1f688557 630{
1f688557 631 static int run_once = 0;
d5a63b99 632 struct alternate_object_database *alt;
1f688557 633
d5a63b99 634 if (run_once)
1f688557 635 return;
9d835df2 636 prepare_packed_git_one(get_object_directory(), 1);
9a217f2a 637 prepare_alt_odb();
d5a63b99 638 for (alt = alt_odb_list; alt; alt = alt->next) {
1494e038 639 alt->name[-1] = 0;
9d835df2 640 prepare_packed_git_one(alt->base, 0);
1494e038 641 alt->name[-1] = '/';
1f688557 642 }
d5a63b99 643 run_once = 1;
1f688557
JH
644}
645
5d6ccf5c 646int check_sha1_signature(const unsigned char *sha1, void *map, unsigned long size, const char *type)
0fcfd160 647{
d98b46f8 648 char header[100];
0fcfd160
LT
649 unsigned char real_sha1[20];
650 SHA_CTX c;
651
652 SHA1_Init(&c);
d98b46f8 653 SHA1_Update(&c, header, 1+sprintf(header, "%s %lu", type, size));
0fcfd160
LT
654 SHA1_Update(&c, map, size);
655 SHA1_Final(real_sha1, &c);
656 return memcmp(sha1, real_sha1, 20) ? -1 : 0;
657}
658
1f688557 659static void *map_sha1_file_internal(const unsigned char *sha1,
d5f1befc 660 unsigned long *size)
0fcfd160 661{
0fcfd160
LT
662 struct stat st;
663 void *map;
144bde78 664 int fd;
ace1534d
JH
665 char *filename = find_sha1_file(sha1, &st);
666
667 if (!filename) {
ace1534d
JH
668 return NULL;
669 }
0fcfd160 670
144bde78 671 fd = open(filename, O_RDONLY | sha1_file_open_flag);
0fcfd160 672 if (fd < 0) {
144bde78
LT
673 /* See if it works without O_NOATIME */
674 switch (sha1_file_open_flag) {
675 default:
676 fd = open(filename, O_RDONLY);
677 if (fd >= 0)
678 break;
679 /* Fallthrough */
680 case 0:
144bde78
LT
681 return NULL;
682 }
683
1f688557
JH
684 /* If it failed once, it will probably fail again.
685 * Stop using O_NOATIME
686 */
144bde78 687 sha1_file_open_flag = 0;
0fcfd160 688 }
0fcfd160
LT
689 map = mmap(NULL, st.st_size, PROT_READ, MAP_PRIVATE, fd, 0);
690 close(fd);
e35f9824 691 if (map == MAP_FAILED)
0fcfd160
LT
692 return NULL;
693 *size = st.st_size;
694 return map;
695}
696
c4483576
LT
697int unpack_sha1_header(z_stream *stream, void *map, unsigned long mapsize, void *buffer, unsigned long size)
698{
699 /* Get the data stream */
700 memset(stream, 0, sizeof(*stream));
701 stream->next_in = map;
702 stream->avail_in = mapsize;
703 stream->next_out = buffer;
704 stream->avail_out = size;
705
706 inflateInit(stream);
707 return inflate(stream, 0);
708}
709
6da4016a 710static void *unpack_sha1_rest(z_stream *stream, void *buffer, unsigned long size)
5180cacc
LT
711{
712 int bytes = strlen(buffer) + 1;
d565b341 713 unsigned char *buf = xmalloc(1+size);
5180cacc
LT
714
715 memcpy(buf, buffer + bytes, stream->total_out - bytes);
716 bytes = stream->total_out - bytes;
717 if (bytes < size) {
718 stream->next_out = buf + bytes;
719 stream->avail_out = size - bytes;
720 while (inflate(stream, Z_FINISH) == Z_OK)
721 /* nothing */;
722 }
723 buf[size] = 0;
724 inflateEnd(stream);
725 return buf;
726}
727
728/*
729 * We used to just use "sscanf()", but that's actually way
730 * too permissive for what we want to check. So do an anal
731 * object header parse by hand.
732 */
733int parse_sha1_header(char *hdr, char *type, unsigned long *sizep)
734{
735 int i;
736 unsigned long size;
737
738 /*
739 * The type can be at most ten bytes (including the
740 * terminating '\0' that we add), and is followed by
741 * a space.
742 */
743 i = 10;
744 for (;;) {
745 char c = *hdr++;
746 if (c == ' ')
747 break;
748 if (!--i)
749 return -1;
750 *type++ = c;
751 }
752 *type = 0;
753
754 /*
755 * The length must follow immediately, and be in canonical
756 * decimal format (ie "010" is not valid).
757 */
758 size = *hdr++ - '0';
759 if (size > 9)
760 return -1;
761 if (size) {
762 for (;;) {
763 unsigned long c = *hdr - '0';
764 if (c > 9)
765 break;
766 hdr++;
767 size = size * 10 + c;
768 }
769 }
770 *sizep = size;
771
772 /*
773 * The length must be followed by a zero byte
774 */
775 return *hdr ? -1 : 0;
776}
777
0fcfd160
LT
778void * unpack_sha1_file(void *map, unsigned long mapsize, char *type, unsigned long *size)
779{
5180cacc 780 int ret;
0fcfd160 781 z_stream stream;
5180cacc 782 char hdr[8192];
0fcfd160 783
5180cacc
LT
784 ret = unpack_sha1_header(&stream, map, mapsize, hdr, sizeof(hdr));
785 if (ret < Z_OK || parse_sha1_header(hdr, type, size) < 0)
0fcfd160
LT
786 return NULL;
787
5180cacc 788 return unpack_sha1_rest(&stream, hdr, *size);
0fcfd160
LT
789}
790
f3bf9224
JH
791/* forward declaration for a mutually recursive function */
792static int packed_object_info(struct pack_entry *entry,
793 char *type, unsigned long *sizep);
794
5db47c2b
JH
795static int packed_delta_info(unsigned char *base_sha1,
796 unsigned long delta_size,
797 unsigned long left,
798 char *type,
f3bf9224
JH
799 unsigned long *sizep,
800 struct packed_git *p)
5db47c2b 801{
f3bf9224
JH
802 struct pack_entry base_ent;
803
5db47c2b
JH
804 if (left < 20)
805 die("truncated pack file");
5db47c2b 806
f3bf9224
JH
807 /* The base entry _must_ be in the same pack */
808 if (!find_pack_entry_one(base_sha1, &base_ent, p))
809 die("failed to find delta-pack base object %s",
810 sha1_to_hex(base_sha1));
811
c62266f3
JH
812 /* We choose to only get the type of the base object and
813 * ignore potentially corrupt pack file that expects the delta
814 * based on a base with a wrong size. This saves tons of
815 * inflate() calls.
816 */
5db47c2b 817
f3bf9224 818 if (packed_object_info(&base_ent, type, NULL))
c62266f3 819 die("cannot get info for delta-pack base");
5db47c2b 820
c62266f3
JH
821 if (sizep) {
822 const unsigned char *data;
823 unsigned char delta_head[64];
824 unsigned long result_size;
825 z_stream stream;
826 int st;
827
828 memset(&stream, 0, sizeof(stream));
829
830 data = stream.next_in = base_sha1 + 20;
831 stream.avail_in = left - 20;
832 stream.next_out = delta_head;
833 stream.avail_out = sizeof(delta_head);
834
835 inflateInit(&stream);
836 st = inflate(&stream, Z_FINISH);
837 inflateEnd(&stream);
838 if ((st != Z_STREAM_END) &&
839 stream.total_out != sizeof(delta_head))
840 die("delta data unpack-initial failed");
841
842 /* Examine the initial part of the delta to figure out
843 * the result size.
844 */
845 data = delta_head;
8960844a
NP
846
847 /* ignore base size */
848 get_delta_hdr_size(&data, delta_head+sizeof(delta_head));
5db47c2b 849
c62266f3 850 /* Read the result size */
8960844a 851 result_size = get_delta_hdr_size(&data, delta_head+sizeof(delta_head));
c62266f3
JH
852 *sizep = result_size;
853 }
5db47c2b
JH
854 return 0;
855}
856
a733cb60
LT
857static unsigned long unpack_object_header(struct packed_git *p, unsigned long offset,
858 enum object_type *type, unsigned long *sizep)
859{
01247d87 860 unsigned shift;
a733cb60
LT
861 unsigned char *pack, c;
862 unsigned long size;
863
864 if (offset >= p->pack_size)
865 die("object offset outside of pack file");
866
867 pack = p->pack_base + offset;
868 c = *pack++;
869 offset++;
870 *type = (c >> 4) & 7;
871 size = c & 15;
01247d87 872 shift = 4;
a733cb60
LT
873 while (c & 0x80) {
874 if (offset >= p->pack_size)
875 die("object offset outside of pack file");
876 c = *pack++;
877 offset++;
01247d87
LT
878 size += (c & 0x7f) << shift;
879 shift += 7;
a733cb60
LT
880 }
881 *sizep = size;
882 return offset;
883}
884
a49dd05f
JH
885int check_reuse_pack_delta(struct packed_git *p, unsigned long offset,
886 unsigned char *base, unsigned long *sizep,
887 enum object_type *kindp)
888{
889 unsigned long ptr;
890 int status = -1;
891
892 use_packed_git(p);
893 ptr = offset;
894 ptr = unpack_object_header(p, ptr, kindp, sizep);
895 if (*kindp != OBJ_DELTA)
896 goto done;
897 memcpy(base, p->pack_base + ptr, 20);
898 status = 0;
899 done:
900 unuse_packed_git(p);
901 return status;
902}
903
ad8c80a5
JH
904void packed_object_info_detail(struct pack_entry *e,
905 char *type,
906 unsigned long *size,
907 unsigned long *store_size,
f8f135c9 908 unsigned int *delta_chain_length,
ad8c80a5
JH
909 unsigned char *base_sha1)
910{
911 struct packed_git *p = e->p;
2855d580 912 unsigned long offset;
ad8c80a5
JH
913 unsigned char *pack;
914 enum object_type kind;
915
916 offset = unpack_object_header(p, e->offset, &kind, size);
917 pack = p->pack_base + offset;
ad8c80a5
JH
918 if (kind != OBJ_DELTA)
919 *delta_chain_length = 0;
920 else {
f8f135c9 921 unsigned int chain_length = 0;
2855d580
JH
922 if (p->pack_size <= offset + 20)
923 die("pack file %s records an incomplete delta base",
924 p->pack_name);
ad8c80a5
JH
925 memcpy(base_sha1, pack, 20);
926 do {
927 struct pack_entry base_ent;
928 unsigned long junk;
929
930 find_pack_entry_one(pack, &base_ent, p);
931 offset = unpack_object_header(p, base_ent.offset,
932 &kind, &junk);
933 pack = p->pack_base + offset;
934 chain_length++;
935 } while (kind == OBJ_DELTA);
936 *delta_chain_length = chain_length;
937 }
938 switch (kind) {
939 case OBJ_COMMIT:
8e440259 940 strcpy(type, commit_type);
ad8c80a5
JH
941 break;
942 case OBJ_TREE:
8e440259 943 strcpy(type, tree_type);
ad8c80a5
JH
944 break;
945 case OBJ_BLOB:
8e440259 946 strcpy(type, blob_type);
ad8c80a5
JH
947 break;
948 case OBJ_TAG:
8e440259 949 strcpy(type, tag_type);
ad8c80a5
JH
950 break;
951 default:
264b16b6
JH
952 die("corrupted pack file %s containing object of kind %d",
953 p->pack_name, kind);
ad8c80a5
JH
954 }
955 *store_size = 0; /* notyet */
956}
957
1f688557
JH
958static int packed_object_info(struct pack_entry *entry,
959 char *type, unsigned long *sizep)
960{
961 struct packed_git *p = entry->p;
962 unsigned long offset, size, left;
963 unsigned char *pack;
a733cb60 964 enum object_type kind;
f9253394 965 int retval;
5db47c2b
JH
966
967 if (use_packed_git(p))
968 die("cannot map packed file");
969
a733cb60 970 offset = unpack_object_header(p, entry->offset, &kind, &size);
1f688557 971 pack = p->pack_base + offset;
a733cb60
LT
972 left = p->pack_size - offset;
973
974 switch (kind) {
975 case OBJ_DELTA:
f3bf9224 976 retval = packed_delta_info(pack, size, left, type, sizep, p);
f9253394
JH
977 unuse_packed_git(p);
978 return retval;
a733cb60 979 case OBJ_COMMIT:
8e440259 980 strcpy(type, commit_type);
1f688557 981 break;
a733cb60 982 case OBJ_TREE:
8e440259 983 strcpy(type, tree_type);
1f688557 984 break;
a733cb60 985 case OBJ_BLOB:
8e440259 986 strcpy(type, blob_type);
1f688557 987 break;
a733cb60 988 case OBJ_TAG:
8e440259 989 strcpy(type, tag_type);
a69d0943 990 break;
1f688557 991 default:
264b16b6
JH
992 die("corrupted pack file %s containing object of kind %d",
993 p->pack_name, kind);
1f688557 994 }
c62266f3
JH
995 if (sizep)
996 *sizep = size;
f9253394 997 unuse_packed_git(p);
1f688557
JH
998 return 0;
999}
1000
1001/* forward declaration for a mutually recursive function */
1002static void *unpack_entry(struct pack_entry *, char *, unsigned long *);
1003
1004static void *unpack_delta_entry(unsigned char *base_sha1,
1005 unsigned long delta_size,
1006 unsigned long left,
1007 char *type,
f3bf9224
JH
1008 unsigned long *sizep,
1009 struct packed_git *p)
1f688557 1010{
f3bf9224 1011 struct pack_entry base_ent;
1f688557
JH
1012 void *data, *delta_data, *result, *base;
1013 unsigned long data_size, result_size, base_size;
1014 z_stream stream;
1015 int st;
1016
1017 if (left < 20)
1018 die("truncated pack file");
67686d95
JH
1019
1020 /* The base entry _must_ be in the same pack */
1021 if (!find_pack_entry_one(base_sha1, &base_ent, p))
1022 die("failed to find delta-pack base object %s",
1023 sha1_to_hex(base_sha1));
1024 base = unpack_entry_gently(&base_ent, type, &base_size);
1025 if (!base)
1026 die("failed to read delta-pack base object %s",
1027 sha1_to_hex(base_sha1));
1028
1f688557
JH
1029 data = base_sha1 + 20;
1030 data_size = left - 20;
1031 delta_data = xmalloc(delta_size);
1032
1033 memset(&stream, 0, sizeof(stream));
1034
1035 stream.next_in = data;
1036 stream.avail_in = data_size;
1037 stream.next_out = delta_data;
1038 stream.avail_out = delta_size;
1039
1040 inflateInit(&stream);
1041 st = inflate(&stream, Z_FINISH);
1042 inflateEnd(&stream);
1043 if ((st != Z_STREAM_END) || stream.total_out != delta_size)
1044 die("delta data unpack failed");
1045
1f688557
JH
1046 result = patch_delta(base, base_size,
1047 delta_data, delta_size,
1048 &result_size);
1049 if (!result)
1050 die("failed to apply delta");
1051 free(delta_data);
1052 free(base);
1053 *sizep = result_size;
1054 return result;
1055}
1056
1057static void *unpack_non_delta_entry(unsigned char *data,
1058 unsigned long size,
1059 unsigned long left)
1060{
1061 int st;
1062 z_stream stream;
4d235c80 1063 unsigned char *buffer;
1f688557
JH
1064
1065 buffer = xmalloc(size + 1);
1066 buffer[size] = 0;
1067 memset(&stream, 0, sizeof(stream));
1068 stream.next_in = data;
1069 stream.avail_in = left;
1070 stream.next_out = buffer;
1071 stream.avail_out = size;
1072
1073 inflateInit(&stream);
1074 st = inflate(&stream, Z_FINISH);
1075 inflateEnd(&stream);
1076 if ((st != Z_STREAM_END) || stream.total_out != size) {
1077 free(buffer);
1078 return NULL;
1079 }
1080
1081 return buffer;
1082}
1083
1084static void *unpack_entry(struct pack_entry *entry,
1085 char *type, unsigned long *sizep)
1086{
1087 struct packed_git *p = entry->p;
f9253394 1088 void *retval;
1f688557
JH
1089
1090 if (use_packed_git(p))
1091 die("cannot map packed file");
f3bf9224
JH
1092 retval = unpack_entry_gently(entry, type, sizep);
1093 unuse_packed_git(p);
1094 if (!retval)
264b16b6 1095 die("corrupted pack file %s", p->pack_name);
f3bf9224
JH
1096 return retval;
1097}
1098
1099/* The caller is responsible for use_packed_git()/unuse_packed_git() pair */
1100void *unpack_entry_gently(struct pack_entry *entry,
1101 char *type, unsigned long *sizep)
1102{
1103 struct packed_git *p = entry->p;
1104 unsigned long offset, size, left;
1105 unsigned char *pack;
1106 enum object_type kind;
1107 void *retval;
1f688557 1108
a733cb60 1109 offset = unpack_object_header(p, entry->offset, &kind, &size);
1f688557 1110 pack = p->pack_base + offset;
a733cb60
LT
1111 left = p->pack_size - offset;
1112 switch (kind) {
1113 case OBJ_DELTA:
f3bf9224 1114 retval = unpack_delta_entry(pack, size, left, type, sizep, p);
f9253394 1115 return retval;
a733cb60 1116 case OBJ_COMMIT:
8e440259 1117 strcpy(type, commit_type);
1f688557 1118 break;
a733cb60 1119 case OBJ_TREE:
8e440259 1120 strcpy(type, tree_type);
1f688557 1121 break;
a733cb60 1122 case OBJ_BLOB:
8e440259 1123 strcpy(type, blob_type);
1f688557 1124 break;
a733cb60 1125 case OBJ_TAG:
8e440259 1126 strcpy(type, tag_type);
a69d0943 1127 break;
1f688557 1128 default:
f3bf9224 1129 return NULL;
1f688557
JH
1130 }
1131 *sizep = size;
f9253394 1132 retval = unpack_non_delta_entry(pack, size, left);
f9253394 1133 return retval;
1f688557
JH
1134}
1135
9a217f2a
JH
1136int num_packed_objects(const struct packed_git *p)
1137{
f9253394 1138 /* See check_packed_git_idx() */
9a217f2a
JH
1139 return (p->index_size - 20 - 20 - 4*256) / 24;
1140}
1141
1142int nth_packed_object_sha1(const struct packed_git *p, int n,
1143 unsigned char* sha1)
1144{
1145 void *index = p->index_base + 256;
1146 if (n < 0 || num_packed_objects(p) <= n)
1147 return -1;
1148 memcpy(sha1, (index + 24 * n + 4), 20);
1149 return 0;
1150}
1151
f3bf9224
JH
1152int find_pack_entry_one(const unsigned char *sha1,
1153 struct pack_entry *e, struct packed_git *p)
1f688557 1154{
4d235c80 1155 unsigned int *level1_ofs = p->index_base;
1f688557
JH
1156 int hi = ntohl(level1_ofs[*sha1]);
1157 int lo = ((*sha1 == 0x0) ? 0 : ntohl(level1_ofs[*sha1 - 1]));
1158 void *index = p->index_base + 256;
1159
1160 do {
1161 int mi = (lo + hi) / 2;
1162 int cmp = memcmp(index + 24 * mi + 4, sha1, 20);
1163 if (!cmp) {
1b9bc5a7 1164 e->offset = ntohl(*((unsigned int *)(index + 24 * mi)));
1f688557
JH
1165 memcpy(e->sha1, sha1, 20);
1166 e->p = p;
1167 return 1;
1168 }
1169 if (cmp > 0)
1170 hi = mi;
1171 else
1172 lo = mi+1;
1173 } while (lo < hi);
1174 return 0;
1175}
1176
1177static int find_pack_entry(const unsigned char *sha1, struct pack_entry *e)
1178{
1179 struct packed_git *p;
1180 prepare_packed_git();
1181
1182 for (p = packed_git; p; p = p->next) {
f3bf9224 1183 if (find_pack_entry_one(sha1, e, p))
1f688557
JH
1184 return 1;
1185 }
1186 return 0;
1187}
1188
bf592c50
DB
1189struct packed_git *find_sha1_pack(const unsigned char *sha1,
1190 struct packed_git *packs)
1191{
1192 struct packed_git *p;
1193 struct pack_entry e;
1194
1195 for (p = packs; p; p = p->next) {
1196 if (find_pack_entry_one(sha1, &e, p))
1197 return p;
1198 }
1199 return NULL;
1200
1201}
1202
36e4d74a 1203int sha1_object_info(const unsigned char *sha1, char *type, unsigned long *sizep)
65c2e0c3 1204{
36e4d74a 1205 int status;
65c2e0c3
JH
1206 unsigned long mapsize, size;
1207 void *map;
1208 z_stream stream;
36e4d74a 1209 char hdr[128];
65c2e0c3 1210
d5f1befc 1211 map = map_sha1_file_internal(sha1, &mapsize);
1f688557
JH
1212 if (!map) {
1213 struct pack_entry e;
1214
1215 if (!find_pack_entry(sha1, &e))
1216 return error("unable to find %s", sha1_to_hex(sha1));
c62266f3 1217 return packed_object_info(&e, type, sizep);
1f688557 1218 }
36e4d74a
JH
1219 if (unpack_sha1_header(&stream, map, mapsize, hdr, sizeof(hdr)) < 0)
1220 status = error("unable to unpack %s header",
1221 sha1_to_hex(sha1));
1222 if (parse_sha1_header(hdr, type, &size) < 0)
1223 status = error("unable to parse %s header", sha1_to_hex(sha1));
c4584ae3 1224 else {
65c2e0c3 1225 status = 0;
c62266f3
JH
1226 if (sizep)
1227 *sizep = size;
65c2e0c3 1228 }
65c2e0c3
JH
1229 inflateEnd(&stream);
1230 munmap(map, mapsize);
1231 return status;
1232}
1233
1f688557
JH
1234static void *read_packed_sha1(const unsigned char *sha1, char *type, unsigned long *size)
1235{
1236 struct pack_entry e;
1237
1238 if (!find_pack_entry(sha1, &e)) {
1239 error("cannot read sha1_file for %s", sha1_to_hex(sha1));
1240 return NULL;
1241 }
1242 return unpack_entry(&e, type, size);
1243}
1244
0fcfd160
LT
1245void * read_sha1_file(const unsigned char *sha1, char *type, unsigned long *size)
1246{
1247 unsigned long mapsize;
1248 void *map, *buf;
ab90ea5d 1249 struct pack_entry e;
0fcfd160 1250
ab90ea5d
JH
1251 if (find_pack_entry(sha1, &e))
1252 return read_packed_sha1(sha1, type, size);
d5f1befc 1253 map = map_sha1_file_internal(sha1, &mapsize);
0fcfd160
LT
1254 if (map) {
1255 buf = unpack_sha1_file(map, mapsize, type, size);
1256 munmap(map, mapsize);
1257 return buf;
1258 }
ab90ea5d 1259 return NULL;
0fcfd160
LT
1260}
1261
40469ee9 1262void *read_object_with_reference(const unsigned char *sha1,
bf0f910d 1263 const char *required_type,
40469ee9
JH
1264 unsigned long *size,
1265 unsigned char *actual_sha1_return)
f4913f91
JH
1266{
1267 char type[20];
1268 void *buffer;
1269 unsigned long isize;
40469ee9 1270 unsigned char actual_sha1[20];
f4913f91 1271
40469ee9
JH
1272 memcpy(actual_sha1, sha1, 20);
1273 while (1) {
1274 int ref_length = -1;
1275 const char *ref_type = NULL;
f4913f91 1276
40469ee9
JH
1277 buffer = read_sha1_file(actual_sha1, type, &isize);
1278 if (!buffer)
1279 return NULL;
1280 if (!strcmp(type, required_type)) {
1281 *size = isize;
1282 if (actual_sha1_return)
1283 memcpy(actual_sha1_return, actual_sha1, 20);
1284 return buffer;
1285 }
1286 /* Handle references */
8e440259 1287 else if (!strcmp(type, commit_type))
40469ee9 1288 ref_type = "tree ";
8e440259 1289 else if (!strcmp(type, tag_type))
40469ee9
JH
1290 ref_type = "object ";
1291 else {
1292 free(buffer);
1293 return NULL;
1294 }
1295 ref_length = strlen(ref_type);
f4913f91 1296
40469ee9
JH
1297 if (memcmp(buffer, ref_type, ref_length) ||
1298 get_sha1_hex(buffer + ref_length, actual_sha1)) {
1299 free(buffer);
1300 return NULL;
1301 }
1cf58e72 1302 free(buffer);
40469ee9
JH
1303 /* Now we have the ID of the referred-to object in
1304 * actual_sha1. Check again. */
f4913f91 1305 }
f4913f91
JH
1306}
1307
7672db20
BL
1308char *write_sha1_file_prepare(void *buf,
1309 unsigned long len,
1310 const char *type,
1311 unsigned char *sha1,
1312 unsigned char *hdr,
1313 int *hdrlen)
d410c0f5
JH
1314{
1315 SHA_CTX c;
1316
1317 /* Generate the header */
1318 *hdrlen = sprintf((char *)hdr, "%s %lu", type, len)+1;
1319
1320 /* Sha1.. */
1321 SHA1_Init(&c);
1322 SHA1_Update(&c, hdr, *hdrlen);
1323 SHA1_Update(&c, buf, len);
1324 SHA1_Final(sha1, &c);
1325
1326 return sha1_file_name(sha1);
1327}
1328
230f1322
LT
1329/*
1330 * Link the tempfile to the final place, possibly creating the
1331 * last directory level as you do so.
1332 *
1333 * Returns the errno on failure, 0 on success.
1334 */
1335static int link_temp_to_file(const char *tmpfile, char *filename)
1336{
1337 int ret;
1338
1339 if (!link(tmpfile, filename))
1340 return 0;
1341
1342 /*
1343 * Try to mkdir the last path component if that failed
1344 * with an ENOENT.
1345 *
1346 * Re-try the "link()" regardless of whether the mkdir
1347 * succeeds, since a race might mean that somebody
1348 * else succeeded.
1349 */
1350 ret = errno;
1351 if (ret == ENOENT) {
1352 char *dir = strrchr(filename, '/');
1353 if (dir) {
1354 *dir = 0;
1355 mkdir(filename, 0777);
457f06d6
JS
1356 if (adjust_shared_perm(filename))
1357 return -2;
230f1322
LT
1358 *dir = '/';
1359 if (!link(tmpfile, filename))
1360 return 0;
1361 ret = errno;
1362 }
1363 }
1364 return ret;
1365}
1366
1367/*
1368 * Move the just written object into its final resting place
1369 */
b721e01f 1370int move_temp_to_file(const char *tmpfile, char *filename)
230f1322
LT
1371{
1372 int ret = link_temp_to_file(tmpfile, filename);
7ebb6fca
LT
1373
1374 /*
1375 * Coda hack - coda doesn't like cross-directory links,
1376 * so we fall back to a rename, which will mean that it
1377 * won't be able to check collisions, but that's not a
1378 * big deal.
1379 *
1380 * The same holds for FAT formatted media.
1381 *
1382 * When this succeeds, we just return 0. We have nothing
1383 * left to unlink.
1384 */
1385 if (ret && ret != EEXIST) {
1386 if (!rename(tmpfile, filename))
230f1322 1387 return 0;
9e48b389 1388 ret = errno;
230f1322
LT
1389 }
1390 unlink(tmpfile);
1391 if (ret) {
1392 if (ret != EEXIST) {
7246ed43 1393 fprintf(stderr, "unable to write sha1 filename %s: %s\n", filename, strerror(ret));
230f1322
LT
1394 return -1;
1395 }
1396 /* FIXME!!! Collision check here ? */
1397 }
1398
1399 return 0;
1400}
1401
4d548150
LT
1402static int write_buffer(int fd, const void *buf, size_t len)
1403{
1404 while (len) {
1405 ssize_t size;
1406
1407 size = write(fd, buf, len);
1408 if (!size)
1409 return error("file write: disk full");
1410 if (size < 0) {
1411 if (errno == EINTR || errno == EAGAIN)
1412 continue;
1413 return error("file write error (%s)", strerror(errno));
1414 }
1415 len -= size;
1416 buf += size;
1417 }
1418 return 0;
1419}
1420
bf0f910d 1421int write_sha1_file(void *buf, unsigned long len, const char *type, unsigned char *returnsha1)
0fcfd160
LT
1422{
1423 int size;
bf0f910d 1424 unsigned char *compressed;
0fcfd160
LT
1425 z_stream stream;
1426 unsigned char sha1[20];
706bc531 1427 char *filename;
aac17941 1428 static char tmpfile[PATH_MAX];
bf0f910d 1429 unsigned char hdr[50];
230f1322 1430 int fd, hdrlen;
a44c9a5e 1431
d410c0f5
JH
1432 /* Normally if we have it in the pack then we do not bother writing
1433 * it out into .git/objects/??/?{38} file.
1434 */
1435 filename = write_sha1_file_prepare(buf, len, type, sha1, hdr, &hdrlen);
706bc531
LT
1436 if (returnsha1)
1437 memcpy(returnsha1, sha1, 20);
d410c0f5
JH
1438 if (has_sha1_file(sha1))
1439 return 0;
aac17941
LT
1440 fd = open(filename, O_RDONLY);
1441 if (fd >= 0) {
706bc531 1442 /*
aac17941
LT
1443 * FIXME!!! We might do collision checking here, but we'd
1444 * need to uncompress the old file and check it. Later.
706bc531 1445 */
aac17941 1446 close(fd);
706bc531
LT
1447 return 0;
1448 }
1449
aac17941 1450 if (errno != ENOENT) {
7246ed43 1451 fprintf(stderr, "sha1 file %s: %s\n", filename, strerror(errno));
aac17941
LT
1452 return -1;
1453 }
1454
1455 snprintf(tmpfile, sizeof(tmpfile), "%s/obj_XXXXXX", get_object_directory());
ace1534d 1456
aac17941
LT
1457 fd = mkstemp(tmpfile);
1458 if (fd < 0) {
7246ed43 1459 fprintf(stderr, "unable to create temporary sha1 filename %s: %s\n", tmpfile, strerror(errno));
aac17941
LT
1460 return -1;
1461 }
1462
0fcfd160
LT
1463 /* Set it up */
1464 memset(&stream, 0, sizeof(stream));
1465 deflateInit(&stream, Z_BEST_COMPRESSION);
a44c9a5e 1466 size = deflateBound(&stream, len+hdrlen);
812666c8 1467 compressed = xmalloc(size);
0fcfd160
LT
1468
1469 /* Compress it */
0fcfd160
LT
1470 stream.next_out = compressed;
1471 stream.avail_out = size;
a44c9a5e
LT
1472
1473 /* First header.. */
1474 stream.next_in = hdr;
1475 stream.avail_in = hdrlen;
1476 while (deflate(&stream, 0) == Z_OK)
6ffcee88 1477 /* nothing */;
a44c9a5e
LT
1478
1479 /* Then the data itself.. */
1480 stream.next_in = buf;
1481 stream.avail_in = len;
0fcfd160
LT
1482 while (deflate(&stream, Z_FINISH) == Z_OK)
1483 /* nothing */;
1484 deflateEnd(&stream);
1485 size = stream.total_out;
1486
4d548150
LT
1487 if (write_buffer(fd, compressed, size) < 0)
1488 die("unable to write sha1 file");
aac17941 1489 fchmod(fd, 0444);
706bc531 1490 close(fd);
383f85b7 1491 free(compressed);
0fcfd160 1492
230f1322 1493 return move_temp_to_file(tmpfile, filename);
0fcfd160 1494}
8237b185 1495
4d548150
LT
1496/*
1497 * We need to unpack and recompress the object for writing
1498 * it out to a different file.
1499 */
1500static void *repack_object(const unsigned char *sha1, unsigned long *objsize)
a5eda52b 1501{
4d548150 1502 size_t size;
a5eda52b 1503 z_stream stream;
4d548150
LT
1504 unsigned char *unpacked;
1505 unsigned long len;
1506 char type[20];
1507 char hdr[50];
1508 int hdrlen;
1509 void *buf;
bfc66daf 1510
4d548150
LT
1511 // need to unpack and recompress it by itself
1512 unpacked = read_packed_sha1(sha1, type, &len);
a5eda52b 1513
4d548150 1514 hdrlen = sprintf(hdr, "%s %lu", type, len) + 1;
a5eda52b 1515
4d548150
LT
1516 /* Set it up */
1517 memset(&stream, 0, sizeof(stream));
1518 deflateInit(&stream, Z_BEST_COMPRESSION);
1519 size = deflateBound(&stream, len + hdrlen);
1520 buf = xmalloc(size);
a5eda52b 1521
4d548150
LT
1522 /* Compress it */
1523 stream.next_out = buf;
1524 stream.avail_out = size;
a5eda52b 1525
4d548150
LT
1526 /* First header.. */
1527 stream.next_in = (void *)hdr;
1528 stream.avail_in = hdrlen;
1529 while (deflate(&stream, 0) == Z_OK)
1530 /* nothing */;
bfc66daf 1531
4d548150
LT
1532 /* Then the data itself.. */
1533 stream.next_in = unpacked;
1534 stream.avail_in = len;
1535 while (deflate(&stream, Z_FINISH) == Z_OK)
1536 /* nothing */;
1537 deflateEnd(&stream);
1538 free(unpacked);
bfc66daf 1539
4d548150
LT
1540 *objsize = stream.total_out;
1541 return buf;
1542}
1543
1544int write_sha1_to_fd(int fd, const unsigned char *sha1)
1545{
1546 int retval;
1547 unsigned long objsize;
1548 void *buf = map_sha1_file_internal(sha1, &objsize);
1549
1550 if (buf) {
1551 retval = write_buffer(fd, buf, objsize);
1552 munmap(buf, objsize);
1553 return retval;
1554 }
1555
1556 buf = repack_object(sha1, &objsize);
1557 retval = write_buffer(fd, buf, objsize);
1558 free(buf);
1559 return retval;
a5eda52b
DB
1560}
1561
70b9829e
DB
1562int write_sha1_from_fd(const unsigned char *sha1, int fd, char *buffer,
1563 size_t bufsize, size_t *bufposn)
8237b185 1564{
230f1322 1565 char tmpfile[PATH_MAX];
8237b185
DB
1566 int local;
1567 z_stream stream;
1568 unsigned char real_sha1[20];
bf0f910d 1569 unsigned char discard[4096];
8237b185
DB
1570 int ret;
1571 SHA_CTX c;
1572
230f1322 1573 snprintf(tmpfile, sizeof(tmpfile), "%s/obj_XXXXXX", get_object_directory());
8237b185 1574
230f1322 1575 local = mkstemp(tmpfile);
8237b185 1576 if (local < 0)
bd2afde8
JH
1577 return error("Couldn't open %s for %s",
1578 tmpfile, sha1_to_hex(sha1));
8237b185
DB
1579
1580 memset(&stream, 0, sizeof(stream));
1581
1582 inflateInit(&stream);
1583
1584 SHA1_Init(&c);
1585
1586 do {
1587 ssize_t size;
70b9829e
DB
1588 if (*bufposn) {
1589 stream.avail_in = *bufposn;
96ad15ae 1590 stream.next_in = (unsigned char *) buffer;
70b9829e
DB
1591 do {
1592 stream.next_out = discard;
1593 stream.avail_out = sizeof(discard);
1594 ret = inflate(&stream, Z_SYNC_FLUSH);
1595 SHA1_Update(&c, discard, sizeof(discard) -
1596 stream.avail_out);
1597 } while (stream.avail_in && ret == Z_OK);
4d548150
LT
1598 if (write_buffer(local, buffer, *bufposn - stream.avail_in) < 0)
1599 die("unable to write sha1 file");
70b9829e
DB
1600 memmove(buffer, buffer + *bufposn - stream.avail_in,
1601 stream.avail_in);
1602 *bufposn = stream.avail_in;
1603 if (ret != Z_OK)
1604 break;
1605 }
1606 size = read(fd, buffer + *bufposn, bufsize - *bufposn);
8237b185
DB
1607 if (size <= 0) {
1608 close(local);
230f1322 1609 unlink(tmpfile);
8237b185
DB
1610 if (!size)
1611 return error("Connection closed?");
1612 perror("Reading from connection");
1613 return -1;
1614 }
70b9829e
DB
1615 *bufposn += size;
1616 } while (1);
8237b185
DB
1617 inflateEnd(&stream);
1618
1619 close(local);
1620 SHA1_Final(real_sha1, &c);
1621 if (ret != Z_STREAM_END) {
230f1322 1622 unlink(tmpfile);
8237b185
DB
1623 return error("File %s corrupted", sha1_to_hex(sha1));
1624 }
1625 if (memcmp(sha1, real_sha1, 20)) {
230f1322 1626 unlink(tmpfile);
bd2afde8 1627 return error("File %s has bad hash", sha1_to_hex(sha1));
8237b185 1628 }
230f1322
LT
1629
1630 return move_temp_to_file(tmpfile, sha1_file_name(sha1));
8237b185
DB
1631}
1632
bf592c50
DB
1633int has_pack_index(const unsigned char *sha1)
1634{
1635 struct stat st;
1636 if (stat(sha1_pack_index_name(sha1), &st))
1637 return 0;
1638 return 1;
1639}
1640
1641int has_pack_file(const unsigned char *sha1)
1642{
1643 struct stat st;
1644 if (stat(sha1_pack_name(sha1), &st))
1645 return 0;
1646 return 1;
1647}
1648
dade09c2
LT
1649int has_sha1_pack(const unsigned char *sha1)
1650{
1651 struct pack_entry e;
1652 return find_pack_entry(sha1, &e);
1653}
1654
8237b185
DB
1655int has_sha1_file(const unsigned char *sha1)
1656{
8237b185 1657 struct stat st;
1f688557
JH
1658 struct pack_entry e;
1659
ab90ea5d 1660 if (find_pack_entry(sha1, &e))
1f688557 1661 return 1;
ab90ea5d 1662 return find_sha1_file(sha1, &st) ? 1 : 0;
8237b185 1663}
74400e71 1664
e7332f96
BE
1665/*
1666 * reads from fd as long as possible into a supplied buffer of size bytes.
1667 * If neccessary the buffer's size is increased using realloc()
1668 *
1669 * returns 0 if anything went fine and -1 otherwise
1670 *
1671 * NOTE: both buf and size may change, but even when -1 is returned
1672 * you still have to free() it yourself.
1673 */
1674int read_pipe(int fd, char** return_buf, unsigned long* return_size)
024510c8 1675{
e7332f96
BE
1676 char* buf = *return_buf;
1677 unsigned long size = *return_size;
1678 int iret;
024510c8 1679 unsigned long off = 0;
e7332f96 1680
024510c8 1681 do {
e7332f96 1682 iret = xread(fd, buf + off, size - off);
024510c8
DB
1683 if (iret > 0) {
1684 off += iret;
1685 if (off == size) {
1686 size *= 2;
1687 buf = realloc(buf, size);
1688 }
1689 }
1690 } while (iret > 0);
e7332f96
BE
1691
1692 *return_buf = buf;
1693 *return_size = off;
1694
1695 if (iret < 0)
1696 return -1;
1697 return 0;
1698}
1699
1700int index_pipe(unsigned char *sha1, int fd, const char *type, int write_object)
1701{
1702 unsigned long size = 4096;
1703 char *buf = malloc(size);
1704 int ret;
1705 unsigned char hdr[50];
1706 int hdrlen;
1707
1708 if (read_pipe(fd, &buf, &size)) {
024510c8
DB
1709 free(buf);
1710 return -1;
1711 }
e7332f96 1712
024510c8 1713 if (!type)
8e440259 1714 type = blob_type;
024510c8 1715 if (write_object)
e7332f96 1716 ret = write_sha1_file(buf, size, type, sha1);
024510c8 1717 else {
e7332f96 1718 write_sha1_file_prepare(buf, size, type, sha1, hdr, &hdrlen);
024510c8
DB
1719 ret = 0;
1720 }
1721 free(buf);
1722 return ret;
1723}
1724
7672db20 1725int index_fd(unsigned char *sha1, int fd, struct stat *st, int write_object, const char *type)
74400e71 1726{
74400e71 1727 unsigned long size = st->st_size;
aac17941
LT
1728 void *buf;
1729 int ret;
7672db20
BL
1730 unsigned char hdr[50];
1731 int hdrlen;
74400e71 1732
aac17941 1733 buf = "";
74400e71 1734 if (size)
aac17941 1735 buf = mmap(NULL, size, PROT_READ, MAP_PRIVATE, fd, 0);
74400e71 1736 close(fd);
e35f9824 1737 if (buf == MAP_FAILED)
74400e71
JH
1738 return -1;
1739
7672db20 1740 if (!type)
8e440259 1741 type = blob_type;
7672db20
BL
1742 if (write_object)
1743 ret = write_sha1_file(buf, size, type, sha1);
1744 else {
1745 write_sha1_file_prepare(buf, size, type, sha1, hdr, &hdrlen);
1746 ret = 0;
1747 }
aac17941
LT
1748 if (size)
1749 munmap(buf, size);
1750 return ret;
74400e71 1751}
ec1fcc16
JH
1752
1753int index_path(unsigned char *sha1, const char *path, struct stat *st, int write_object)
1754{
1755 int fd;
1756 char *target;
1757
1758 switch (st->st_mode & S_IFMT) {
1759 case S_IFREG:
1760 fd = open(path, O_RDONLY);
1761 if (fd < 0)
1762 return error("open(\"%s\"): %s", path,
1763 strerror(errno));
1764 if (index_fd(sha1, fd, st, write_object, NULL) < 0)
1765 return error("%s: failed to insert into database",
1766 path);
1767 break;
1768 case S_IFLNK:
1769 target = xmalloc(st->st_size+1);
1770 if (readlink(path, target, st->st_size+1) != st->st_size) {
1771 char *errstr = strerror(errno);
1772 free(target);
1773 return error("readlink(\"%s\"): %s", path,
1774 errstr);
1775 }
1776 if (!write_object) {
1777 unsigned char hdr[50];
1778 int hdrlen;
8e440259 1779 write_sha1_file_prepare(target, st->st_size, blob_type,
ec1fcc16 1780 sha1, hdr, &hdrlen);
8e440259 1781 } else if (write_sha1_file(target, st->st_size, blob_type, sha1))
ec1fcc16
JH
1782 return error("%s: failed to insert into database",
1783 path);
1784 free(target);
1785 break;
1786 default:
1787 return error("%s: unsupported file type", path);
1788 }
1789 return 0;
1790}