formalize typename(), and add its reverse type_from_string()
[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 409static size_t pack_mapped;
9a217f2a 410struct packed_git *packed_git;
1f688557 411
a53128b6
SP
412void pack_report()
413{
414 fprintf(stderr,
e05db0fd
PR
415 "pack_report: getpagesize() = %10" SZ_FMT "\n"
416 "pack_report: core.packedGitWindowSize = %10" SZ_FMT "\n"
417 "pack_report: core.packedGitLimit = %10" SZ_FMT "\n",
78a28df9 418 (size_t) getpagesize(),
a53128b6
SP
419 packed_git_window_size,
420 packed_git_limit);
421 fprintf(stderr,
422 "pack_report: pack_used_ctr = %10u\n"
423 "pack_report: pack_mmap_calls = %10u\n"
424 "pack_report: pack_open_windows = %10u / %10u\n"
e05db0fd
PR
425 "pack_report: pack_mapped = "
426 "%10" SZ_FMT " / %10" SZ_FMT "\n",
a53128b6
SP
427 pack_used_ctr,
428 pack_mmap_calls,
429 pack_open_windows, peak_pack_open_windows,
430 pack_mapped, peak_pack_mapped);
431}
432
1f688557
JH
433static int check_packed_git_idx(const char *path, unsigned long *idx_size_,
434 void **idx_map_)
435{
436 void *idx_map;
b18b00a6 437 uint32_t *index;
1f688557
JH
438 unsigned long idx_size;
439 int nr, i;
e93ec6f9 440 int fd = open(path, O_RDONLY);
1f688557
JH
441 struct stat st;
442 if (fd < 0)
443 return -1;
444 if (fstat(fd, &st)) {
445 close(fd);
446 return -1;
447 }
448 idx_size = st.st_size;
c4712e45 449 idx_map = xmmap(NULL, idx_size, PROT_READ, MAP_PRIVATE, fd, 0);
1f688557 450 close(fd);
1f688557
JH
451
452 index = idx_map;
4d235c80
LT
453 *idx_map_ = idx_map;
454 *idx_size_ = idx_size;
1f688557
JH
455
456 /* check index map */
f9253394 457 if (idx_size < 4*256 + 20 + 20)
df1b059d
SP
458 return error("index file %s is too small", path);
459
460 /* a future index format would start with this, as older git
461 * binaries would fail the non-monotonic index check below.
462 * give a nicer warning to the user if we can.
463 */
464 if (index[0] == htonl(PACK_IDX_SIGNATURE))
465 return error("index file %s is a newer version"
466 " and is not supported by this binary"
467 " (try upgrading GIT to a newer version)",
468 path);
469
1f688557
JH
470 nr = 0;
471 for (i = 0; i < 256; i++) {
472 unsigned int n = ntohl(index[i]);
473 if (n < nr)
df1b059d 474 return error("non-monotonic index %s", path);
1f688557
JH
475 nr = n;
476 }
477
478 /*
479 * Total size:
480 * - 256 index entries 4 bytes each
481 * - 24-byte entries * nr (20-byte sha1 + 4-byte offset)
482 * - 20-byte SHA1 of the packfile
483 * - 20-byte SHA1 file checksum
484 */
485 if (idx_size != 4*256 + nr * 24 + 20 + 20)
df1b059d 486 return error("wrong index file size in %s", path);
1f688557 487
1f688557
JH
488 return 0;
489}
490
11daf39b
SP
491static void scan_windows(struct packed_git *p,
492 struct packed_git **lru_p,
493 struct pack_window **lru_w,
494 struct pack_window **lru_l)
1f688557 495{
11daf39b
SP
496 struct pack_window *w, *w_l;
497
498 for (w_l = NULL, w = p->windows; w; w = w->next) {
499 if (!w->inuse_cnt) {
500 if (!*lru_w || w->last_used < (*lru_w)->last_used) {
501 *lru_p = p;
502 *lru_w = w;
503 *lru_l = w_l;
54044bf8 504 }
54044bf8 505 }
11daf39b 506 w_l = w;
f9253394 507 }
11daf39b
SP
508}
509
510static int unuse_one_window(struct packed_git *current)
511{
512 struct packed_git *p, *lru_p = NULL;
513 struct pack_window *lru_w = NULL, *lru_l = NULL;
514
515 if (current)
516 scan_windows(current, &lru_p, &lru_w, &lru_l);
517 for (p = packed_git; p; p = p->next)
518 scan_windows(p, &lru_p, &lru_w, &lru_l);
54044bf8
SP
519 if (lru_p) {
520 munmap(lru_w->base, lru_w->len);
521 pack_mapped -= lru_w->len;
522 if (lru_l)
523 lru_l->next = lru_w->next;
524 else {
525 lru_p->windows = lru_w->next;
11daf39b 526 if (!lru_p->windows && lru_p != current) {
54044bf8
SP
527 close(lru_p->pack_fd);
528 lru_p->pack_fd = -1;
529 }
530 }
531 free(lru_w);
a53128b6 532 pack_open_windows--;
54044bf8
SP
533 return 1;
534 }
535 return 0;
f9253394
JH
536}
537
97bfeb34
SP
538void release_pack_memory(size_t need)
539{
540 size_t cur = pack_mapped;
541 while (need >= (cur - pack_mapped) && unuse_one_window(NULL))
542 ; /* nothing */
543}
544
03e79c88 545void unuse_pack(struct pack_window **w_cursor)
f9253394 546{
03e79c88
SP
547 struct pack_window *w = *w_cursor;
548 if (w) {
549 w->inuse_cnt--;
550 *w_cursor = NULL;
551 }
1f688557
JH
552}
553
3cf8b462
SP
554/*
555 * Do not call this directly as this leaks p->pack_fd on error return;
556 * call open_packed_git() instead.
557 */
558static int open_packed_git_1(struct packed_git *p)
1f688557 559{
9bc879c1
SP
560 struct stat st;
561 struct pack_header hdr;
562 unsigned char sha1[20];
563 unsigned char *idx_sha1;
2c039da8 564 long fd_flag;
9bc879c1
SP
565
566 p->pack_fd = open(p->pack_name, O_RDONLY);
567 if (p->pack_fd < 0 || fstat(p->pack_fd, &st))
072db278 568 return -1;
9bc879c1
SP
569
570 /* If we created the struct before we had the pack we lack size. */
bf592c50 571 if (!p->pack_size) {
bf592c50 572 if (!S_ISREG(st.st_mode))
072db278 573 return error("packfile %s not a regular file", p->pack_name);
bf592c50 574 p->pack_size = st.st_size;
9bc879c1 575 } else if (p->pack_size != st.st_size)
072db278 576 return error("packfile %s size changed", p->pack_name);
9bc879c1 577
2c039da8
JH
578 /* We leave these file descriptors open with sliding mmap;
579 * there is no point keeping them open across exec(), though.
580 */
581 fd_flag = fcntl(p->pack_fd, F_GETFD, 0);
582 if (fd_flag < 0)
072db278 583 return error("cannot determine file descriptor flags");
2c039da8
JH
584 fd_flag |= FD_CLOEXEC;
585 if (fcntl(p->pack_fd, F_SETFD, fd_flag) == -1)
072db278 586 return error("cannot set FD_CLOEXEC");
2c039da8 587
9bc879c1 588 /* Verify we recognize this pack file format. */
e6e2bd62 589 if (read_in_full(p->pack_fd, &hdr, sizeof(hdr)) != sizeof(hdr))
072db278 590 return error("file %s is far too short to be a packfile", p->pack_name);
9bc879c1 591 if (hdr.hdr_signature != htonl(PACK_SIGNATURE))
072db278 592 return error("file %s is not a GIT packfile", p->pack_name);
9bc879c1 593 if (!pack_version_ok(hdr.hdr_version))
072db278 594 return error("packfile %s is version %u and not supported"
9bc879c1
SP
595 " (try upgrading GIT to a newer version)",
596 p->pack_name, ntohl(hdr.hdr_version));
597
598 /* Verify the pack matches its index. */
599 if (num_packed_objects(p) != ntohl(hdr.hdr_entries))
072db278 600 return error("packfile %s claims to have %u objects"
9bc879c1
SP
601 " while index size indicates %u objects",
602 p->pack_name, ntohl(hdr.hdr_entries),
603 num_packed_objects(p));
604 if (lseek(p->pack_fd, p->pack_size - sizeof(sha1), SEEK_SET) == -1)
072db278 605 return error("end of packfile %s is unavailable", p->pack_name);
e6e2bd62 606 if (read_in_full(p->pack_fd, sha1, sizeof(sha1)) != sizeof(sha1))
072db278 607 return error("packfile %s signature is unavailable", p->pack_name);
9bc879c1
SP
608 idx_sha1 = ((unsigned char *)p->index_base) + p->index_size - 40;
609 if (hashcmp(sha1, idx_sha1))
072db278
SP
610 return error("packfile %s does not match index", p->pack_name);
611 return 0;
9bc879c1
SP
612}
613
3cf8b462
SP
614static int open_packed_git(struct packed_git *p)
615{
616 if (!open_packed_git_1(p))
617 return 0;
618 if (p->pack_fd != -1) {
619 close(p->pack_fd);
620 p->pack_fd = -1;
621 }
622 return -1;
623}
624
60bb8b14
SP
625static int in_window(struct pack_window *win, unsigned long offset)
626{
627 /* We must promise at least 20 bytes (one hash) after the
628 * offset is available from this window, otherwise the offset
629 * is not actually in this window and a different window (which
630 * has that one hash excess) must be used. This is to support
631 * the object header and delta base parsing routines below.
632 */
633 off_t win_off = win->offset;
634 return win_off <= offset
635 && (offset + 20) <= (win_off + win->len);
636}
637
03e79c88
SP
638unsigned char* use_pack(struct packed_git *p,
639 struct pack_window **w_cursor,
640 unsigned long offset,
641 unsigned int *left)
9bc879c1 642{
60bb8b14 643 struct pack_window *win = *w_cursor;
03e79c88 644
072db278
SP
645 if (p->pack_fd == -1 && open_packed_git(p))
646 die("packfile %s cannot be accessed", p->pack_name);
60bb8b14
SP
647
648 /* Since packfiles end in a hash of their content and its
649 * pointless to ask for an offset into the middle of that
650 * hash, and the in_window function above wouldn't match
651 * don't allow an offset too close to the end of the file.
652 */
653 if (offset > (p->pack_size - 20))
654 die("offset beyond end of packfile (truncated pack?)");
655
656 if (!win || !in_window(win, offset)) {
657 if (win)
658 win->inuse_cnt--;
659 for (win = p->windows; win; win = win->next) {
660 if (in_window(win, offset))
661 break;
662 }
663 if (!win) {
78a28df9 664 size_t window_align = packed_git_window_size / 2;
60bb8b14 665 win = xcalloc(1, sizeof(*win));
78a28df9 666 win->offset = (offset / window_align) * window_align;
60bb8b14
SP
667 win->len = p->pack_size - win->offset;
668 if (win->len > packed_git_window_size)
669 win->len = packed_git_window_size;
670 pack_mapped += win->len;
11daf39b
SP
671 while (packed_git_limit < pack_mapped
672 && unuse_one_window(p))
60bb8b14 673 ; /* nothing */
c4712e45 674 win->base = xmmap(NULL, win->len,
60bb8b14
SP
675 PROT_READ, MAP_PRIVATE,
676 p->pack_fd, win->offset);
677 if (win->base == MAP_FAILED)
73b4e4be
SP
678 die("packfile %s cannot be mapped: %s",
679 p->pack_name,
680 strerror(errno));
a53128b6
SP
681 pack_mmap_calls++;
682 pack_open_windows++;
683 if (pack_mapped > peak_pack_mapped)
684 peak_pack_mapped = pack_mapped;
685 if (pack_open_windows > peak_pack_open_windows)
686 peak_pack_open_windows = pack_open_windows;
60bb8b14
SP
687 win->next = p->windows;
688 p->windows = win;
689 }
1f688557 690 }
03e79c88
SP
691 if (win != *w_cursor) {
692 win->last_used = pack_used_ctr++;
693 win->inuse_cnt++;
694 *w_cursor = win;
695 }
60bb8b14 696 offset -= win->offset;
03e79c88
SP
697 if (left)
698 *left = win->len - offset;
699 return win->base + offset;
1f688557
JH
700}
701
9d835df2 702struct packed_git *add_packed_git(char *path, int path_len, int local)
1f688557
JH
703{
704 struct stat st;
705 struct packed_git *p;
706 unsigned long idx_size;
707 void *idx_map;
c0bbbb1b 708 unsigned char sha1[20];
1f688557
JH
709
710 if (check_packed_git_idx(path, &idx_size, &idx_map))
711 return NULL;
712
713 /* do we have a corresponding .pack file? */
714 strcpy(path + path_len - 4, ".pack");
715 if (stat(path, &st) || !S_ISREG(st.st_mode)) {
716 munmap(idx_map, idx_size);
717 return NULL;
718 }
719 /* ok, it looks sane as far as we can check without
720 * actually mapping the pack file.
721 */
722 p = xmalloc(sizeof(*p) + path_len + 2);
723 strcpy(p->pack_name, path);
724 p->index_size = idx_size;
725 p->pack_size = st.st_size;
726 p->index_base = idx_map;
727 p->next = NULL;
c41ee586 728 p->windows = NULL;
9bc879c1 729 p->pack_fd = -1;
9d835df2 730 p->pack_local = local;
f4a11066 731 if ((path_len > 44) && !get_sha1_hex(path + path_len - 44, sha1))
e702496e 732 hashcpy(p->sha1, sha1);
1f688557
JH
733 return p;
734}
735
bf592c50 736struct packed_git *parse_pack_index(unsigned char *sha1)
c508df5e
DB
737{
738 char *path = sha1_pack_index_name(sha1);
739 return parse_pack_index_file(sha1, path);
740}
741
2ab141a2 742struct packed_git *parse_pack_index_file(const unsigned char *sha1, char *idx_path)
bf592c50
DB
743{
744 struct packed_git *p;
745 unsigned long idx_size;
746 void *idx_map;
c508df5e 747 char *path;
bf592c50 748
c508df5e 749 if (check_packed_git_idx(idx_path, &idx_size, &idx_map))
bf592c50
DB
750 return NULL;
751
752 path = sha1_pack_name(sha1);
753
754 p = xmalloc(sizeof(*p) + strlen(path) + 2);
755 strcpy(p->pack_name, path);
756 p->index_size = idx_size;
757 p->pack_size = 0;
758 p->index_base = idx_map;
759 p->next = NULL;
c41ee586 760 p->windows = NULL;
9bc879c1 761 p->pack_fd = -1;
e702496e 762 hashcpy(p->sha1, sha1);
bf592c50
DB
763 return p;
764}
765
766void install_packed_git(struct packed_git *pack)
767{
768 pack->next = packed_git;
769 packed_git = pack;
770}
771
9d835df2 772static void prepare_packed_git_one(char *objdir, int local)
1f688557
JH
773{
774 char path[PATH_MAX];
775 int len;
776 DIR *dir;
777 struct dirent *de;
778
779 sprintf(path, "%s/pack", objdir);
780 len = strlen(path);
781 dir = opendir(path);
b5b16990 782 if (!dir) {
26125f6b 783 if (errno != ENOENT)
bd2afde8 784 error("unable to open object pack directory: %s: %s",
26125f6b 785 path, strerror(errno));
1f688557 786 return;
b5b16990 787 }
1f688557
JH
788 path[len++] = '/';
789 while ((de = readdir(dir)) != NULL) {
790 int namelen = strlen(de->d_name);
791 struct packed_git *p;
792
5bb1cda5 793 if (!has_extension(de->d_name, ".idx"))
1f688557
JH
794 continue;
795
54a15a8d 796 /* Don't reopen a pack we already have. */
1f688557 797 strcpy(path + len, de->d_name);
86f7780c
JK
798 for (p = packed_git; p; p = p->next) {
799 if (!memcmp(path, p->pack_name, len + namelen - 4))
800 break;
801 }
802 if (p)
803 continue;
54a15a8d
SP
804 /* See if it really is a valid .idx file with corresponding
805 * .pack file that we can map.
806 */
9d835df2 807 p = add_packed_git(path, len + namelen, local);
1f688557
JH
808 if (!p)
809 continue;
625e9421 810 install_packed_git(p);
1f688557 811 }
5b35bcd5 812 closedir(dir);
1f688557
JH
813}
814
637cdd9d 815static int prepare_packed_git_run_once = 0;
9a217f2a 816void prepare_packed_git(void)
1f688557 817{
d5a63b99 818 struct alternate_object_database *alt;
1f688557 819
637cdd9d 820 if (prepare_packed_git_run_once)
1f688557 821 return;
9d835df2 822 prepare_packed_git_one(get_object_directory(), 1);
9a217f2a 823 prepare_alt_odb();
d5a63b99 824 for (alt = alt_odb_list; alt; alt = alt->next) {
1494e038 825 alt->name[-1] = 0;
9d835df2 826 prepare_packed_git_one(alt->base, 0);
1494e038 827 alt->name[-1] = '/';
1f688557 828 }
637cdd9d
JK
829 prepare_packed_git_run_once = 1;
830}
831
fc04c412 832void reprepare_packed_git(void)
637cdd9d
JK
833{
834 prepare_packed_git_run_once = 0;
835 prepare_packed_git();
1f688557
JH
836}
837
5d6ccf5c 838int check_sha1_signature(const unsigned char *sha1, void *map, unsigned long size, const char *type)
0fcfd160
LT
839{
840 unsigned char real_sha1[20];
7cfb5f36 841 hash_sha1_file(map, size, type, real_sha1);
a89fccd2 842 return hashcmp(sha1, real_sha1) ? -1 : 0;
0fcfd160
LT
843}
844
bb6b8e4f 845void *map_sha1_file(const unsigned char *sha1, unsigned long *size)
0fcfd160 846{
0fcfd160
LT
847 struct stat st;
848 void *map;
144bde78 849 int fd;
ace1534d
JH
850 char *filename = find_sha1_file(sha1, &st);
851
852 if (!filename) {
ace1534d
JH
853 return NULL;
854 }
0fcfd160 855
144bde78 856 fd = open(filename, O_RDONLY | sha1_file_open_flag);
0fcfd160 857 if (fd < 0) {
144bde78
LT
858 /* See if it works without O_NOATIME */
859 switch (sha1_file_open_flag) {
860 default:
861 fd = open(filename, O_RDONLY);
862 if (fd >= 0)
863 break;
864 /* Fallthrough */
865 case 0:
144bde78
LT
866 return NULL;
867 }
868
1f688557
JH
869 /* If it failed once, it will probably fail again.
870 * Stop using O_NOATIME
871 */
144bde78 872 sha1_file_open_flag = 0;
0fcfd160 873 }
c4712e45 874 map = xmmap(NULL, st.st_size, PROT_READ, MAP_PRIVATE, fd, 0);
0fcfd160 875 close(fd);
0fcfd160
LT
876 *size = st.st_size;
877 return map;
878}
879
bb6b8e4f
JH
880int legacy_loose_object(unsigned char *map)
881{
882 unsigned int word;
883
884 /*
885 * Is it a zlib-compressed buffer? If so, the first byte
886 * must be 0x78 (15-bit window size, deflated), and the
887 * first 16-bit word is evenly divisible by 31
888 */
889 word = (map[0] << 8) + map[1];
890 if (map[0] == 0x78 && !(word % 31))
891 return 1;
892 else
893 return 0;
894}
895
72518e9c 896unsigned long unpack_object_header_gently(const unsigned char *buf, unsigned long len, enum object_type *type, unsigned long *sizep)
c4483576 897{
ad1ed5ee 898 unsigned shift;
93821bd9 899 unsigned char c;
93821bd9 900 unsigned long size;
ad1ed5ee
JH
901 unsigned long used = 0;
902
903 c = buf[used++];
904 *type = (c >> 4) & 7;
905 size = c & 15;
906 shift = 4;
907 while (c & 0x80) {
908 if (len <= used)
909 return 0;
910 if (sizeof(long) * 8 <= shift)
911 return 0;
912 c = buf[used++];
913 size += (c & 0x7f) << shift;
914 shift += 7;
915 }
916 *sizep = size;
917 return used;
918}
919
920static int unpack_sha1_header(z_stream *stream, unsigned char *map, unsigned long mapsize, void *buffer, unsigned long bufsiz)
921{
922 unsigned long size, used;
923 static const char valid_loose_object_type[8] = {
924 0, /* OBJ_EXT */
925 1, 1, 1, 1, /* "commit", "tree", "blob", "tag" */
926 0, /* "delta" and others are invalid in a loose object */
93821bd9 927 };
ad1ed5ee 928 enum object_type type;
93821bd9 929
c4483576
LT
930 /* Get the data stream */
931 memset(stream, 0, sizeof(*stream));
932 stream->next_in = map;
933 stream->avail_in = mapsize;
934 stream->next_out = buffer;
93821bd9
LT
935 stream->avail_out = bufsiz;
936
bb6b8e4f 937 if (legacy_loose_object(map)) {
93821bd9
LT
938 inflateInit(stream);
939 return inflate(stream, 0);
940 }
941
ad1ed5ee
JH
942 used = unpack_object_header_gently(map, mapsize, &type, &size);
943 if (!used || !valid_loose_object_type[type])
93821bd9 944 return -1;
ad1ed5ee
JH
945 map += used;
946 mapsize -= used;
93821bd9
LT
947
948 /* Set up the stream for the rest.. */
949 stream->next_in = map;
950 stream->avail_in = mapsize;
c4483576 951 inflateInit(stream);
93821bd9
LT
952
953 /* And generate the fake traditional header */
ad1ed5ee 954 stream->total_out = 1 + snprintf(buffer, bufsiz, "%s %lu",
df843662 955 typename(type), size);
93821bd9 956 return 0;
c4483576
LT
957}
958
6da4016a 959static void *unpack_sha1_rest(z_stream *stream, void *buffer, unsigned long size)
5180cacc
LT
960{
961 int bytes = strlen(buffer) + 1;
d565b341 962 unsigned char *buf = xmalloc(1+size);
93821bd9 963 unsigned long n;
5180cacc 964
93821bd9
LT
965 n = stream->total_out - bytes;
966 if (n > size)
967 n = size;
968 memcpy(buf, (char *) buffer + bytes, n);
969 bytes = n;
5180cacc
LT
970 if (bytes < size) {
971 stream->next_out = buf + bytes;
972 stream->avail_out = size - bytes;
973 while (inflate(stream, Z_FINISH) == Z_OK)
974 /* nothing */;
975 }
976 buf[size] = 0;
977 inflateEnd(stream);
978 return buf;
979}
980
981/*
982 * We used to just use "sscanf()", but that's actually way
983 * too permissive for what we want to check. So do an anal
984 * object header parse by hand.
985 */
38d3874d 986static int parse_sha1_header(char *hdr, char *type, unsigned long *sizep)
5180cacc
LT
987{
988 int i;
989 unsigned long size;
990
991 /*
992 * The type can be at most ten bytes (including the
993 * terminating '\0' that we add), and is followed by
994 * a space.
995 */
996 i = 10;
997 for (;;) {
998 char c = *hdr++;
999 if (c == ' ')
1000 break;
1001 if (!--i)
1002 return -1;
1003 *type++ = c;
1004 }
1005 *type = 0;
1006
1007 /*
1008 * The length must follow immediately, and be in canonical
1009 * decimal format (ie "010" is not valid).
1010 */
1011 size = *hdr++ - '0';
1012 if (size > 9)
1013 return -1;
1014 if (size) {
1015 for (;;) {
1016 unsigned long c = *hdr - '0';
1017 if (c > 9)
1018 break;
1019 hdr++;
1020 size = size * 10 + c;
1021 }
1022 }
1023 *sizep = size;
1024
1025 /*
1026 * The length must be followed by a zero byte
1027 */
1028 return *hdr ? -1 : 0;
1029}
1030
0fcfd160
LT
1031void * unpack_sha1_file(void *map, unsigned long mapsize, char *type, unsigned long *size)
1032{
5180cacc 1033 int ret;
0fcfd160 1034 z_stream stream;
5180cacc 1035 char hdr[8192];
0fcfd160 1036
5180cacc
LT
1037 ret = unpack_sha1_header(&stream, map, mapsize, hdr, sizeof(hdr));
1038 if (ret < Z_OK || parse_sha1_header(hdr, type, size) < 0)
0fcfd160
LT
1039 return NULL;
1040
5180cacc 1041 return unpack_sha1_rest(&stream, hdr, *size);
0fcfd160
LT
1042}
1043
eb32d236 1044static unsigned long get_delta_base(struct packed_git *p,
03e79c88 1045 struct pack_window **w_curs,
2b87c45b 1046 unsigned long *curpos,
eb32d236 1047 enum object_type kind,
2b87c45b 1048 unsigned long delta_obj_offset)
eb32d236 1049{
2b87c45b 1050 unsigned char *base_info = use_pack(p, w_curs, *curpos, NULL);
eb32d236
NP
1051 unsigned long base_offset;
1052
8d8a4ea5
SP
1053 /* use_pack() assured us we have [base_info, base_info + 20)
1054 * as a range that we can look at without walking off the
1055 * end of the mapped window. Its actually the hash size
1056 * that is assured. An OFS_DELTA longer than the hash size
1057 * is stupid, as then a REF_DELTA would be smaller to store.
1058 */
eb32d236
NP
1059 if (kind == OBJ_OFS_DELTA) {
1060 unsigned used = 0;
1061 unsigned char c = base_info[used++];
1062 base_offset = c & 127;
1063 while (c & 128) {
1064 base_offset += 1;
1065 if (!base_offset || base_offset & ~(~0UL >> 7))
1066 die("offset value overflow for delta base object");
1067 c = base_info[used++];
1068 base_offset = (base_offset << 7) + (c & 127);
1069 }
1070 base_offset = delta_obj_offset - base_offset;
1071 if (base_offset >= delta_obj_offset)
1072 die("delta base offset out of bound");
2b87c45b 1073 *curpos += used;
eb32d236
NP
1074 } else if (kind == OBJ_REF_DELTA) {
1075 /* The base entry _must_ be in the same pack */
1076 base_offset = find_pack_entry_one(base_info, p);
1077 if (!base_offset)
1078 die("failed to find delta-pack base object %s",
1079 sha1_to_hex(base_info));
2b87c45b 1080 *curpos += 20;
eb32d236
NP
1081 } else
1082 die("I am totally screwed");
2b87c45b 1083 return base_offset;
eb32d236
NP
1084}
1085
f3bf9224 1086/* forward declaration for a mutually recursive function */
43057304 1087static int packed_object_info(struct packed_git *p, unsigned long offset,
f3bf9224
JH
1088 char *type, unsigned long *sizep);
1089
43057304 1090static int packed_delta_info(struct packed_git *p,
03e79c88 1091 struct pack_window **w_curs,
2b87c45b 1092 unsigned long curpos,
eb32d236
NP
1093 enum object_type kind,
1094 unsigned long obj_offset,
5db47c2b 1095 char *type,
43057304 1096 unsigned long *sizep)
5db47c2b 1097{
43057304 1098 unsigned long base_offset;
f3bf9224 1099
2b87c45b 1100 base_offset = get_delta_base(p, w_curs, &curpos, kind, obj_offset);
f3bf9224 1101
c62266f3
JH
1102 /* We choose to only get the type of the base object and
1103 * ignore potentially corrupt pack file that expects the delta
1104 * based on a base with a wrong size. This saves tons of
1105 * inflate() calls.
1106 */
43057304 1107 if (packed_object_info(p, base_offset, type, NULL))
c62266f3 1108 die("cannot get info for delta-pack base");
5db47c2b 1109
c62266f3
JH
1110 if (sizep) {
1111 const unsigned char *data;
079afb18 1112 unsigned char delta_head[20], *in;
c62266f3
JH
1113 z_stream stream;
1114 int st;
1115
1116 memset(&stream, 0, sizeof(stream));
c62266f3
JH
1117 stream.next_out = delta_head;
1118 stream.avail_out = sizeof(delta_head);
1119
1120 inflateInit(&stream);
079afb18 1121 do {
2b87c45b 1122 in = use_pack(p, w_curs, curpos, &stream.avail_in);
079afb18
SP
1123 stream.next_in = in;
1124 st = inflate(&stream, Z_FINISH);
2b87c45b 1125 curpos += stream.next_in - in;
079afb18
SP
1126 } while ((st == Z_OK || st == Z_BUF_ERROR)
1127 && stream.total_out < sizeof(delta_head));
c62266f3
JH
1128 inflateEnd(&stream);
1129 if ((st != Z_STREAM_END) &&
1130 stream.total_out != sizeof(delta_head))
1131 die("delta data unpack-initial failed");
1132
1133 /* Examine the initial part of the delta to figure out
1134 * the result size.
1135 */
1136 data = delta_head;
8960844a
NP
1137
1138 /* ignore base size */
1139 get_delta_hdr_size(&data, delta_head+sizeof(delta_head));
5db47c2b 1140
c62266f3 1141 /* Read the result size */
2b87c45b 1142 *sizep = get_delta_hdr_size(&data, delta_head+sizeof(delta_head));
c62266f3 1143 }
5db47c2b
JH
1144 return 0;
1145}
1146
2b87c45b
NP
1147static int unpack_object_header(struct packed_git *p,
1148 struct pack_window **w_curs,
1149 unsigned long *curpos,
1150 unsigned long *sizep)
a733cb60 1151{
03e79c88
SP
1152 unsigned char *base;
1153 unsigned int left;
ad1ed5ee 1154 unsigned long used;
2b87c45b 1155 enum object_type type;
a733cb60 1156
8d8a4ea5
SP
1157 /* use_pack() assures us we have [base, base + 20) available
1158 * as a range that we can look at at. (Its actually the hash
3dff5379 1159 * size that is assured.) With our object header encoding
8d8a4ea5
SP
1160 * the maximum deflated object size is 2^137, which is just
1161 * insane, so we know won't exceed what we have been given.
1162 */
2b87c45b
NP
1163 base = use_pack(p, w_curs, *curpos, &left);
1164 used = unpack_object_header_gently(base, left, &type, sizep);
ad1ed5ee
JH
1165 if (!used)
1166 die("object offset outside of pack file");
2b87c45b 1167 *curpos += used;
ad1ed5ee 1168
2b87c45b 1169 return type;
a733cb60
LT
1170}
1171
43057304 1172void packed_object_info_detail(struct packed_git *p,
2b87c45b 1173 unsigned long obj_offset,
ad8c80a5
JH
1174 char *type,
1175 unsigned long *size,
1176 unsigned long *store_size,
f8f135c9 1177 unsigned int *delta_chain_length,
ad8c80a5
JH
1178 unsigned char *base_sha1)
1179{
03e79c88 1180 struct pack_window *w_curs = NULL;
2b87c45b 1181 unsigned long curpos, dummy;
43057304 1182 unsigned char *next_sha1;
ad8c80a5
JH
1183 enum object_type kind;
1184
43057304 1185 *delta_chain_length = 0;
2b87c45b
NP
1186 curpos = obj_offset;
1187 kind = unpack_object_header(p, &w_curs, &curpos, size);
43057304
NP
1188
1189 for (;;) {
1190 switch (kind) {
1191 default:
08a19d87 1192 die("pack %s contains unknown object type %d",
43057304
NP
1193 p->pack_name, kind);
1194 case OBJ_COMMIT:
1195 case OBJ_TREE:
1196 case OBJ_BLOB:
1197 case OBJ_TAG:
df843662 1198 strcpy(type, typename(kind));
43057304 1199 *store_size = 0; /* notyet */
03e79c88 1200 unuse_pack(&w_curs);
43057304 1201 return;
eb32d236 1202 case OBJ_OFS_DELTA:
2b87c45b 1203 obj_offset = get_delta_base(p, &w_curs, &curpos, kind, obj_offset);
eb32d236 1204 if (*delta_chain_length == 0) {
2b87c45b 1205 /* TODO: find base_sha1 as pointed by curpos */
eb32d236
NP
1206 }
1207 break;
1208 case OBJ_REF_DELTA:
2b87c45b 1209 next_sha1 = use_pack(p, &w_curs, curpos, NULL);
43057304
NP
1210 if (*delta_chain_length == 0)
1211 hashcpy(base_sha1, next_sha1);
2b87c45b 1212 obj_offset = find_pack_entry_one(next_sha1, p);
43057304
NP
1213 break;
1214 }
43057304 1215 (*delta_chain_length)++;
2b87c45b
NP
1216 curpos = obj_offset;
1217 kind = unpack_object_header(p, &w_curs, &curpos, &dummy);
ad8c80a5 1218 }
ad8c80a5
JH
1219}
1220
2b87c45b 1221static int packed_object_info(struct packed_git *p, unsigned long obj_offset,
1f688557
JH
1222 char *type, unsigned long *sizep)
1223{
03e79c88 1224 struct pack_window *w_curs = NULL;
2b87c45b 1225 unsigned long size, curpos = obj_offset;
a733cb60 1226 enum object_type kind;
5db47c2b 1227
2b87c45b 1228 kind = unpack_object_header(p, &w_curs, &curpos, &size);
5db47c2b 1229
a733cb60 1230 switch (kind) {
eb32d236
NP
1231 case OBJ_OFS_DELTA:
1232 case OBJ_REF_DELTA:
2b87c45b
NP
1233 packed_delta_info(p, &w_curs, curpos, kind,
1234 obj_offset, type, sizep);
1235 break;
a733cb60 1236 case OBJ_COMMIT:
a733cb60 1237 case OBJ_TREE:
a733cb60 1238 case OBJ_BLOB:
a733cb60 1239 case OBJ_TAG:
df843662 1240 strcpy(type, typename(kind));
2b87c45b
NP
1241 if (sizep)
1242 *sizep = size;
a69d0943 1243 break;
1f688557 1244 default:
08a19d87 1245 die("pack %s contains unknown object type %d",
264b16b6 1246 p->pack_name, kind);
1f688557 1247 }
2b87c45b 1248 unuse_pack(&w_curs);
1f688557
JH
1249 return 0;
1250}
1251
eb950c19 1252static void *unpack_compressed_entry(struct packed_git *p,
03e79c88 1253 struct pack_window **w_curs,
2b87c45b 1254 unsigned long curpos,
eb950c19 1255 unsigned long size)
de530aaa
SP
1256{
1257 int st;
1258 z_stream stream;
079afb18 1259 unsigned char *buffer, *in;
de530aaa
SP
1260
1261 buffer = xmalloc(size + 1);
1262 buffer[size] = 0;
1263 memset(&stream, 0, sizeof(stream));
de530aaa
SP
1264 stream.next_out = buffer;
1265 stream.avail_out = size;
1266
1267 inflateInit(&stream);
079afb18 1268 do {
2b87c45b 1269 in = use_pack(p, w_curs, curpos, &stream.avail_in);
079afb18
SP
1270 stream.next_in = in;
1271 st = inflate(&stream, Z_FINISH);
2b87c45b 1272 curpos += stream.next_in - in;
079afb18 1273 } while (st == Z_OK || st == Z_BUF_ERROR);
de530aaa
SP
1274 inflateEnd(&stream);
1275 if ((st != Z_STREAM_END) || stream.total_out != size) {
1276 free(buffer);
1277 return NULL;
1278 }
1279
1280 return buffer;
1281}
1282
eb950c19 1283static void *unpack_delta_entry(struct packed_git *p,
03e79c88 1284 struct pack_window **w_curs,
2b87c45b 1285 unsigned long curpos,
1f688557 1286 unsigned long delta_size,
eb32d236
NP
1287 enum object_type kind,
1288 unsigned long obj_offset,
1f688557 1289 char *type,
eb950c19 1290 unsigned long *sizep)
1f688557 1291{
7c3e8be3 1292 void *delta_data, *result, *base;
43057304 1293 unsigned long result_size, base_size, base_offset;
43057304 1294
2b87c45b 1295 base_offset = get_delta_base(p, w_curs, &curpos, kind, obj_offset);
4d703a1a 1296 base = unpack_entry(p, base_offset, type, &base_size);
67686d95 1297 if (!base)
43057304
NP
1298 die("failed to read delta base object at %lu from %s",
1299 base_offset, p->pack_name);
67686d95 1300
2b87c45b 1301 delta_data = unpack_compressed_entry(p, w_curs, curpos, delta_size);
1f688557
JH
1302 result = patch_delta(base, base_size,
1303 delta_data, delta_size,
1304 &result_size);
1305 if (!result)
1306 die("failed to apply delta");
1307 free(delta_data);
1308 free(base);
1309 *sizep = result_size;
1310 return result;
1311}
1312
2b87c45b
NP
1313void *unpack_entry(struct packed_git *p, unsigned long obj_offset,
1314 char *type, unsigned long *sizep)
1f688557 1315{
03e79c88 1316 struct pack_window *w_curs = NULL;
2b87c45b 1317 unsigned long size, curpos = obj_offset;
4d703a1a 1318 enum object_type kind;
f9253394 1319 void *retval;
1f688557 1320
2b87c45b 1321 kind = unpack_object_header(p, &w_curs, &curpos, &size);
a733cb60 1322 switch (kind) {
eb32d236
NP
1323 case OBJ_OFS_DELTA:
1324 case OBJ_REF_DELTA:
2b87c45b 1325 retval = unpack_delta_entry(p, &w_curs, curpos, size,
03e79c88 1326 kind, obj_offset, type, sizep);
4d703a1a 1327 break;
a733cb60 1328 case OBJ_COMMIT:
a733cb60 1329 case OBJ_TREE:
a733cb60 1330 case OBJ_BLOB:
a733cb60 1331 case OBJ_TAG:
df843662 1332 strcpy(type, typename(kind));
5a18f540 1333 *sizep = size;
2b87c45b 1334 retval = unpack_compressed_entry(p, &w_curs, curpos, size);
4d703a1a 1335 break;
1f688557 1336 default:
4d703a1a 1337 die("unknown object type %i in %s", kind, p->pack_name);
1f688557 1338 }
03e79c88 1339 unuse_pack(&w_curs);
4d703a1a 1340 return retval;
1f688557
JH
1341}
1342
9a217f2a
JH
1343int num_packed_objects(const struct packed_git *p)
1344{
f9253394 1345 /* See check_packed_git_idx() */
9a217f2a
JH
1346 return (p->index_size - 20 - 20 - 4*256) / 24;
1347}
1348
1349int nth_packed_object_sha1(const struct packed_git *p, int n,
1350 unsigned char* sha1)
1351{
1352 void *index = p->index_base + 256;
1353 if (n < 0 || num_packed_objects(p) <= n)
1354 return -1;
e702496e 1355 hashcpy(sha1, (unsigned char *) index + (24 * n) + 4);
9a217f2a
JH
1356 return 0;
1357}
1358
43057304
NP
1359unsigned long find_pack_entry_one(const unsigned char *sha1,
1360 struct packed_git *p)
1f688557 1361{
b18b00a6 1362 uint32_t *level1_ofs = p->index_base;
1f688557
JH
1363 int hi = ntohl(level1_ofs[*sha1]);
1364 int lo = ((*sha1 == 0x0) ? 0 : ntohl(level1_ofs[*sha1 - 1]));
1365 void *index = p->index_base + 256;
1366
1367 do {
1368 int mi = (lo + hi) / 2;
a89fccd2 1369 int cmp = hashcmp((unsigned char *)index + (24 * mi) + 4, sha1);
43057304 1370 if (!cmp)
b18b00a6 1371 return ntohl(*((uint32_t *)((char *)index + (24 * mi))));
1f688557
JH
1372 if (cmp > 0)
1373 hi = mi;
1374 else
1375 lo = mi+1;
1376 } while (lo < hi);
1377 return 0;
1378}
1379
d4ff6d92
SP
1380static int matches_pack_name(struct packed_git *p, const char *ig)
1381{
1382 const char *last_c, *c;
1383
1384 if (!strcmp(p->pack_name, ig))
1385 return 0;
1386
1387 for (c = p->pack_name, last_c = c; *c;)
1388 if (*c == '/')
1389 last_c = ++c;
1390 else
1391 ++c;
1392 if (!strcmp(last_c, ig))
1393 return 0;
1394
1395 return 1;
1396}
1397
106d710b 1398static int find_pack_entry(const unsigned char *sha1, struct pack_entry *e, const char **ignore_packed)
1f688557
JH
1399{
1400 struct packed_git *p;
43057304
NP
1401 unsigned long offset;
1402
1f688557
JH
1403 prepare_packed_git();
1404
1405 for (p = packed_git; p; p = p->next) {
106d710b
JH
1406 if (ignore_packed) {
1407 const char **ig;
1408 for (ig = ignore_packed; *ig; ig++)
d4ff6d92 1409 if (!matches_pack_name(p, *ig))
106d710b
JH
1410 break;
1411 if (*ig)
1412 continue;
1413 }
43057304
NP
1414 offset = find_pack_entry_one(sha1, p);
1415 if (offset) {
c715f783
SP
1416 /*
1417 * We are about to tell the caller where they can
1418 * locate the requested object. We better make
1419 * sure the packfile is still here and can be
1420 * accessed before supplying that answer, as
1421 * it may have been deleted since the index
1422 * was loaded!
1423 */
1424 if (p->pack_fd == -1 && open_packed_git(p)) {
1425 error("packfile %s cannot be accessed", p->pack_name);
1426 continue;
1427 }
43057304
NP
1428 e->offset = offset;
1429 e->p = p;
1430 hashcpy(e->sha1, sha1);
1f688557 1431 return 1;
43057304 1432 }
1f688557
JH
1433 }
1434 return 0;
1435}
1436
bf592c50
DB
1437struct packed_git *find_sha1_pack(const unsigned char *sha1,
1438 struct packed_git *packs)
1439{
1440 struct packed_git *p;
bf592c50
DB
1441
1442 for (p = packs; p; p = p->next) {
43057304 1443 if (find_pack_entry_one(sha1, p))
bf592c50
DB
1444 return p;
1445 }
1446 return NULL;
1447
1448}
1449
f0df4ed5 1450static int sha1_loose_object_info(const unsigned char *sha1, char *type, unsigned long *sizep)
65c2e0c3 1451{
36e4d74a 1452 int status;
65c2e0c3
JH
1453 unsigned long mapsize, size;
1454 void *map;
1455 z_stream stream;
d65a16f6 1456 char hdr[32];
65c2e0c3 1457
bb6b8e4f 1458 map = map_sha1_file(sha1, &mapsize);
f0df4ed5
JS
1459 if (!map)
1460 return error("unable to find %s", sha1_to_hex(sha1));
36e4d74a
JH
1461 if (unpack_sha1_header(&stream, map, mapsize, hdr, sizeof(hdr)) < 0)
1462 status = error("unable to unpack %s header",
1463 sha1_to_hex(sha1));
9ba63031 1464 else if (parse_sha1_header(hdr, type, &size) < 0)
36e4d74a 1465 status = error("unable to parse %s header", sha1_to_hex(sha1));
c4584ae3 1466 else {
65c2e0c3 1467 status = 0;
c62266f3
JH
1468 if (sizep)
1469 *sizep = size;
65c2e0c3 1470 }
65c2e0c3
JH
1471 inflateEnd(&stream);
1472 munmap(map, mapsize);
1473 return status;
1474}
1475
f0df4ed5
JS
1476int sha1_object_info(const unsigned char *sha1, char *type, unsigned long *sizep)
1477{
f0df4ed5
JS
1478 struct pack_entry e;
1479
1480 if (!find_pack_entry(sha1, &e, NULL)) {
1481 reprepare_packed_git();
1482 if (!find_pack_entry(sha1, &e, NULL))
1483 return sha1_loose_object_info(sha1, type, sizep);
1484 }
03e79c88 1485 return packed_object_info(e.p, e.offset, type, sizep);
f0df4ed5
JS
1486}
1487
1f688557
JH
1488static void *read_packed_sha1(const unsigned char *sha1, char *type, unsigned long *size)
1489{
1490 struct pack_entry e;
1491
8276c007 1492 if (!find_pack_entry(sha1, &e, NULL))
1f688557 1493 return NULL;
8276c007
PE
1494 else
1495 return unpack_entry(e.p, e.offset, type, size);
1f688557
JH
1496}
1497
d66b37bb
JH
1498/*
1499 * This is meant to hold a *small* number of objects that you would
1500 * want read_sha1_file() to be able to return, but yet you do not want
1501 * to write them into the object store (e.g. a browse-only
1502 * application).
1503 */
1504static struct cached_object {
1505 unsigned char sha1[20];
1506 const char *type;
1507 void *buf;
1508 unsigned long size;
1509} *cached_objects;
1510static int cached_object_nr, cached_object_alloc;
1511
1512static struct cached_object *find_cached_object(const unsigned char *sha1)
1513{
1514 int i;
1515 struct cached_object *co = cached_objects;
1516
1517 for (i = 0; i < cached_object_nr; i++, co++) {
1518 if (!hashcmp(co->sha1, sha1))
1519 return co;
1520 }
1521 return NULL;
1522}
1523
1524int pretend_sha1_file(void *buf, unsigned long len, const char *type, unsigned char *sha1)
1525{
1526 struct cached_object *co;
1527
1528 hash_sha1_file(buf, len, type, sha1);
1529 if (has_sha1_file(sha1) || find_cached_object(sha1))
1530 return 0;
1531 if (cached_object_alloc <= cached_object_nr) {
1532 cached_object_alloc = alloc_nr(cached_object_alloc);
1533 cached_objects = xrealloc(cached_objects,
1534 sizeof(*cached_objects) *
1535 cached_object_alloc);
1536 }
1537 co = &cached_objects[cached_object_nr++];
1538 co->size = len;
1539 co->type = strdup(type);
efa13f7b
JH
1540 co->buf = xmalloc(len);
1541 memcpy(co->buf, buf, len);
d66b37bb
JH
1542 hashcpy(co->sha1, sha1);
1543 return 0;
1544}
1545
efa13f7b 1546void *read_sha1_file(const unsigned char *sha1, char *type, unsigned long *size)
0fcfd160
LT
1547{
1548 unsigned long mapsize;
1549 void *map, *buf;
d66b37bb
JH
1550 struct cached_object *co;
1551
1552 co = find_cached_object(sha1);
1553 if (co) {
1554 buf = xmalloc(co->size + 1);
1555 memcpy(buf, co->buf, co->size);
1556 ((char*)buf)[co->size] = 0;
1557 strcpy(type, co->type);
1558 *size = co->size;
1559 return buf;
1560 }
0fcfd160 1561
8276c007
PE
1562 buf = read_packed_sha1(sha1, type, size);
1563 if (buf)
1564 return buf;
bb6b8e4f 1565 map = map_sha1_file(sha1, &mapsize);
0fcfd160
LT
1566 if (map) {
1567 buf = unpack_sha1_file(map, mapsize, type, size);
1568 munmap(map, mapsize);
1569 return buf;
1570 }
637cdd9d 1571 reprepare_packed_git();
8276c007 1572 return read_packed_sha1(sha1, type, size);
0fcfd160
LT
1573}
1574
40469ee9 1575void *read_object_with_reference(const unsigned char *sha1,
bf0f910d 1576 const char *required_type,
40469ee9
JH
1577 unsigned long *size,
1578 unsigned char *actual_sha1_return)
f4913f91
JH
1579{
1580 char type[20];
1581 void *buffer;
1582 unsigned long isize;
40469ee9 1583 unsigned char actual_sha1[20];
f4913f91 1584
e702496e 1585 hashcpy(actual_sha1, sha1);
40469ee9
JH
1586 while (1) {
1587 int ref_length = -1;
1588 const char *ref_type = NULL;
f4913f91 1589
40469ee9
JH
1590 buffer = read_sha1_file(actual_sha1, type, &isize);
1591 if (!buffer)
1592 return NULL;
1593 if (!strcmp(type, required_type)) {
1594 *size = isize;
1595 if (actual_sha1_return)
e702496e 1596 hashcpy(actual_sha1_return, actual_sha1);
40469ee9
JH
1597 return buffer;
1598 }
1599 /* Handle references */
8e440259 1600 else if (!strcmp(type, commit_type))
40469ee9 1601 ref_type = "tree ";
8e440259 1602 else if (!strcmp(type, tag_type))
40469ee9
JH
1603 ref_type = "object ";
1604 else {
1605 free(buffer);
1606 return NULL;
1607 }
1608 ref_length = strlen(ref_type);
f4913f91 1609
40469ee9 1610 if (memcmp(buffer, ref_type, ref_length) ||
1d7f171c 1611 get_sha1_hex((char *) buffer + ref_length, actual_sha1)) {
40469ee9
JH
1612 free(buffer);
1613 return NULL;
1614 }
1cf58e72 1615 free(buffer);
40469ee9
JH
1616 /* Now we have the ID of the referred-to object in
1617 * actual_sha1. Check again. */
f4913f91 1618 }
f4913f91
JH
1619}
1620
972a9155
RS
1621static void write_sha1_file_prepare(void *buf, unsigned long len,
1622 const char *type, unsigned char *sha1,
d65a16f6 1623 char *hdr, int *hdrlen)
d410c0f5
JH
1624{
1625 SHA_CTX c;
1626
1627 /* Generate the header */
d65a16f6 1628 *hdrlen = sprintf(hdr, "%s %lu", type, len)+1;
d410c0f5
JH
1629
1630 /* Sha1.. */
1631 SHA1_Init(&c);
1632 SHA1_Update(&c, hdr, *hdrlen);
1633 SHA1_Update(&c, buf, len);
1634 SHA1_Final(sha1, &c);
d410c0f5
JH
1635}
1636
230f1322
LT
1637/*
1638 * Link the tempfile to the final place, possibly creating the
1639 * last directory level as you do so.
1640 *
1641 * Returns the errno on failure, 0 on success.
1642 */
839837b9 1643static int link_temp_to_file(const char *tmpfile, const char *filename)
230f1322
LT
1644{
1645 int ret;
756aaf4a 1646 char *dir;
230f1322
LT
1647
1648 if (!link(tmpfile, filename))
1649 return 0;
1650
1651 /*
756aaf4a 1652 * Try to mkdir the last path component if that failed.
230f1322
LT
1653 *
1654 * Re-try the "link()" regardless of whether the mkdir
1655 * succeeds, since a race might mean that somebody
1656 * else succeeded.
1657 */
1658 ret = errno;
756aaf4a
SP
1659 dir = strrchr(filename, '/');
1660 if (dir) {
1661 *dir = 0;
866cae0d 1662 if (!mkdir(filename, 0777) && adjust_shared_perm(filename)) {
91c23e48 1663 *dir = '/';
756aaf4a 1664 return -2;
91c23e48 1665 }
756aaf4a
SP
1666 *dir = '/';
1667 if (!link(tmpfile, filename))
1668 return 0;
1669 ret = errno;
230f1322
LT
1670 }
1671 return ret;
1672}
1673
1674/*
1675 * Move the just written object into its final resting place
1676 */
839837b9 1677int move_temp_to_file(const char *tmpfile, const char *filename)
230f1322
LT
1678{
1679 int ret = link_temp_to_file(tmpfile, filename);
7ebb6fca
LT
1680
1681 /*
1682 * Coda hack - coda doesn't like cross-directory links,
1683 * so we fall back to a rename, which will mean that it
1684 * won't be able to check collisions, but that's not a
1685 * big deal.
1686 *
1687 * The same holds for FAT formatted media.
1688 *
1689 * When this succeeds, we just return 0. We have nothing
1690 * left to unlink.
1691 */
1692 if (ret && ret != EEXIST) {
1693 if (!rename(tmpfile, filename))
230f1322 1694 return 0;
9e48b389 1695 ret = errno;
230f1322
LT
1696 }
1697 unlink(tmpfile);
1698 if (ret) {
1699 if (ret != EEXIST) {
916d081b 1700 return error("unable to write sha1 filename %s: %s\n", filename, strerror(ret));
230f1322
LT
1701 }
1702 /* FIXME!!! Collision check here ? */
1703 }
1704
1705 return 0;
1706}
1707
4d548150
LT
1708static int write_buffer(int fd, const void *buf, size_t len)
1709{
d34cf19b 1710 if (write_in_full(fd, buf, len) < 0)
93822c22 1711 return error("file write error (%s)", strerror(errno));
4d548150
LT
1712 return 0;
1713}
1714
93821bd9
LT
1715static int write_binary_header(unsigned char *hdr, enum object_type type, unsigned long len)
1716{
1717 int hdr_len;
1718 unsigned char c;
1719
1720 c = (type << 4) | (len & 15);
1721 len >>= 4;
1722 hdr_len = 1;
1723 while (len) {
1724 *hdr++ = c | 0x80;
1725 hdr_len++;
1726 c = (len & 0x7f);
1727 len >>= 7;
1728 }
1729 *hdr = c;
1730 return hdr_len;
1731}
1732
1733static void setup_object_header(z_stream *stream, const char *type, unsigned long len)
1734{
d65a16f6 1735 int obj_type, hdrlen;
93821bd9
LT
1736
1737 if (use_legacy_headers) {
1738 while (deflate(stream, 0) == Z_OK)
1739 /* nothing */;
1740 return;
1741 }
df843662 1742 obj_type = type_from_string(type);
d65a16f6
NP
1743 hdrlen = write_binary_header(stream->next_out, obj_type, len);
1744 stream->total_out = hdrlen;
1745 stream->next_out += hdrlen;
1746 stream->avail_out -= hdrlen;
93821bd9
LT
1747}
1748
abdc3fc8
RS
1749int hash_sha1_file(void *buf, unsigned long len, const char *type,
1750 unsigned char *sha1)
1751{
d65a16f6 1752 char hdr[32];
abdc3fc8
RS
1753 int hdrlen;
1754 write_sha1_file_prepare(buf, len, type, sha1, hdr, &hdrlen);
1755 return 0;
1756}
1757
bf0f910d 1758int write_sha1_file(void *buf, unsigned long len, const char *type, unsigned char *returnsha1)
0fcfd160
LT
1759{
1760 int size;
bf0f910d 1761 unsigned char *compressed;
0fcfd160
LT
1762 z_stream stream;
1763 unsigned char sha1[20];
706bc531 1764 char *filename;
aac17941 1765 static char tmpfile[PATH_MAX];
d65a16f6 1766 char hdr[32];
230f1322 1767 int fd, hdrlen;
a44c9a5e 1768
d410c0f5
JH
1769 /* Normally if we have it in the pack then we do not bother writing
1770 * it out into .git/objects/??/?{38} file.
1771 */
972a9155
RS
1772 write_sha1_file_prepare(buf, len, type, sha1, hdr, &hdrlen);
1773 filename = sha1_file_name(sha1);
706bc531 1774 if (returnsha1)
e702496e 1775 hashcpy(returnsha1, sha1);
d410c0f5
JH
1776 if (has_sha1_file(sha1))
1777 return 0;
aac17941
LT
1778 fd = open(filename, O_RDONLY);
1779 if (fd >= 0) {
706bc531 1780 /*
aac17941
LT
1781 * FIXME!!! We might do collision checking here, but we'd
1782 * need to uncompress the old file and check it. Later.
706bc531 1783 */
aac17941 1784 close(fd);
706bc531
LT
1785 return 0;
1786 }
1787
aac17941 1788 if (errno != ENOENT) {
916d081b 1789 return error("sha1 file %s: %s\n", filename, strerror(errno));
aac17941
LT
1790 }
1791
1792 snprintf(tmpfile, sizeof(tmpfile), "%s/obj_XXXXXX", get_object_directory());
ace1534d 1793
aac17941
LT
1794 fd = mkstemp(tmpfile);
1795 if (fd < 0) {
916d081b
PB
1796 if (errno == EPERM)
1797 return error("insufficient permission for adding an object to repository database %s\n", get_object_directory());
1798 else
1799 return error("unable to create temporary sha1 filename %s: %s\n", tmpfile, strerror(errno));
aac17941
LT
1800 }
1801
0fcfd160
LT
1802 /* Set it up */
1803 memset(&stream, 0, sizeof(stream));
12f6c308 1804 deflateInit(&stream, zlib_compression_level);
93821bd9 1805 size = 8 + deflateBound(&stream, len+hdrlen);
812666c8 1806 compressed = xmalloc(size);
0fcfd160
LT
1807
1808 /* Compress it */
0fcfd160
LT
1809 stream.next_out = compressed;
1810 stream.avail_out = size;
a44c9a5e
LT
1811
1812 /* First header.. */
d65a16f6 1813 stream.next_in = (unsigned char *)hdr;
a44c9a5e 1814 stream.avail_in = hdrlen;
93821bd9 1815 setup_object_header(&stream, type, len);
a44c9a5e
LT
1816
1817 /* Then the data itself.. */
1818 stream.next_in = buf;
1819 stream.avail_in = len;
0fcfd160
LT
1820 while (deflate(&stream, Z_FINISH) == Z_OK)
1821 /* nothing */;
1822 deflateEnd(&stream);
1823 size = stream.total_out;
1824
4d548150
LT
1825 if (write_buffer(fd, compressed, size) < 0)
1826 die("unable to write sha1 file");
aac17941 1827 fchmod(fd, 0444);
706bc531 1828 close(fd);
383f85b7 1829 free(compressed);
0fcfd160 1830
230f1322 1831 return move_temp_to_file(tmpfile, filename);
0fcfd160 1832}
8237b185 1833
4d548150
LT
1834/*
1835 * We need to unpack and recompress the object for writing
1836 * it out to a different file.
1837 */
1838static void *repack_object(const unsigned char *sha1, unsigned long *objsize)
a5eda52b 1839{
4d548150 1840 size_t size;
a5eda52b 1841 z_stream stream;
4d548150
LT
1842 unsigned char *unpacked;
1843 unsigned long len;
1844 char type[20];
d65a16f6 1845 char hdr[32];
4d548150
LT
1846 int hdrlen;
1847 void *buf;
bfc66daf 1848
a9486b02 1849 /* need to unpack and recompress it by itself */
4d548150 1850 unpacked = read_packed_sha1(sha1, type, &len);
8276c007
PE
1851 if (!unpacked)
1852 error("cannot read sha1_file for %s", sha1_to_hex(sha1));
a5eda52b 1853
4d548150 1854 hdrlen = sprintf(hdr, "%s %lu", type, len) + 1;
a5eda52b 1855
4d548150
LT
1856 /* Set it up */
1857 memset(&stream, 0, sizeof(stream));
12f6c308 1858 deflateInit(&stream, zlib_compression_level);
4d548150
LT
1859 size = deflateBound(&stream, len + hdrlen);
1860 buf = xmalloc(size);
a5eda52b 1861
4d548150
LT
1862 /* Compress it */
1863 stream.next_out = buf;
1864 stream.avail_out = size;
a5eda52b 1865
4d548150
LT
1866 /* First header.. */
1867 stream.next_in = (void *)hdr;
1868 stream.avail_in = hdrlen;
1869 while (deflate(&stream, 0) == Z_OK)
1870 /* nothing */;
bfc66daf 1871
4d548150
LT
1872 /* Then the data itself.. */
1873 stream.next_in = unpacked;
1874 stream.avail_in = len;
1875 while (deflate(&stream, Z_FINISH) == Z_OK)
1876 /* nothing */;
1877 deflateEnd(&stream);
1878 free(unpacked);
bfc66daf 1879
4d548150
LT
1880 *objsize = stream.total_out;
1881 return buf;
1882}
1883
1884int write_sha1_to_fd(int fd, const unsigned char *sha1)
1885{
1886 int retval;
1887 unsigned long objsize;
bb6b8e4f 1888 void *buf = map_sha1_file(sha1, &objsize);
4d548150
LT
1889
1890 if (buf) {
1891 retval = write_buffer(fd, buf, objsize);
1892 munmap(buf, objsize);
1893 return retval;
1894 }
1895
1896 buf = repack_object(sha1, &objsize);
1897 retval = write_buffer(fd, buf, objsize);
1898 free(buf);
1899 return retval;
a5eda52b
DB
1900}
1901
70b9829e
DB
1902int write_sha1_from_fd(const unsigned char *sha1, int fd, char *buffer,
1903 size_t bufsize, size_t *bufposn)
8237b185 1904{
230f1322 1905 char tmpfile[PATH_MAX];
8237b185
DB
1906 int local;
1907 z_stream stream;
1908 unsigned char real_sha1[20];
bf0f910d 1909 unsigned char discard[4096];
8237b185
DB
1910 int ret;
1911 SHA_CTX c;
1912
230f1322 1913 snprintf(tmpfile, sizeof(tmpfile), "%s/obj_XXXXXX", get_object_directory());
8237b185 1914
230f1322 1915 local = mkstemp(tmpfile);
916d081b
PB
1916 if (local < 0) {
1917 if (errno == EPERM)
1918 return error("insufficient permission for adding an object to repository database %s\n", get_object_directory());
1919 else
1920 return error("unable to create temporary sha1 filename %s: %s\n", tmpfile, strerror(errno));
1921 }
8237b185
DB
1922
1923 memset(&stream, 0, sizeof(stream));
1924
1925 inflateInit(&stream);
1926
1927 SHA1_Init(&c);
1928
1929 do {
1930 ssize_t size;
70b9829e
DB
1931 if (*bufposn) {
1932 stream.avail_in = *bufposn;
96ad15ae 1933 stream.next_in = (unsigned char *) buffer;
70b9829e
DB
1934 do {
1935 stream.next_out = discard;
1936 stream.avail_out = sizeof(discard);
1937 ret = inflate(&stream, Z_SYNC_FLUSH);
1938 SHA1_Update(&c, discard, sizeof(discard) -
1939 stream.avail_out);
1940 } while (stream.avail_in && ret == Z_OK);
4d548150
LT
1941 if (write_buffer(local, buffer, *bufposn - stream.avail_in) < 0)
1942 die("unable to write sha1 file");
70b9829e
DB
1943 memmove(buffer, buffer + *bufposn - stream.avail_in,
1944 stream.avail_in);
1945 *bufposn = stream.avail_in;
1946 if (ret != Z_OK)
1947 break;
1948 }
93d26e4c 1949 size = xread(fd, buffer + *bufposn, bufsize - *bufposn);
8237b185
DB
1950 if (size <= 0) {
1951 close(local);
230f1322 1952 unlink(tmpfile);
8237b185
DB
1953 if (!size)
1954 return error("Connection closed?");
1955 perror("Reading from connection");
1956 return -1;
1957 }
70b9829e
DB
1958 *bufposn += size;
1959 } while (1);
8237b185
DB
1960 inflateEnd(&stream);
1961
1962 close(local);
1963 SHA1_Final(real_sha1, &c);
1964 if (ret != Z_STREAM_END) {
230f1322 1965 unlink(tmpfile);
8237b185
DB
1966 return error("File %s corrupted", sha1_to_hex(sha1));
1967 }
a89fccd2 1968 if (hashcmp(sha1, real_sha1)) {
230f1322 1969 unlink(tmpfile);
bd2afde8 1970 return error("File %s has bad hash", sha1_to_hex(sha1));
8237b185 1971 }
230f1322
LT
1972
1973 return move_temp_to_file(tmpfile, sha1_file_name(sha1));
8237b185
DB
1974}
1975
bf592c50
DB
1976int has_pack_index(const unsigned char *sha1)
1977{
1978 struct stat st;
1979 if (stat(sha1_pack_index_name(sha1), &st))
1980 return 0;
1981 return 1;
1982}
1983
1984int has_pack_file(const unsigned char *sha1)
1985{
1986 struct stat st;
1987 if (stat(sha1_pack_name(sha1), &st))
1988 return 0;
1989 return 1;
1990}
1991
106d710b 1992int has_sha1_pack(const unsigned char *sha1, const char **ignore_packed)
dade09c2
LT
1993{
1994 struct pack_entry e;
106d710b 1995 return find_pack_entry(sha1, &e, ignore_packed);
dade09c2
LT
1996}
1997
8237b185
DB
1998int has_sha1_file(const unsigned char *sha1)
1999{
8237b185 2000 struct stat st;
1f688557
JH
2001 struct pack_entry e;
2002
106d710b 2003 if (find_pack_entry(sha1, &e, NULL))
1f688557 2004 return 1;
ab90ea5d 2005 return find_sha1_file(sha1, &st) ? 1 : 0;
8237b185 2006}
74400e71 2007
e7332f96
BE
2008/*
2009 * reads from fd as long as possible into a supplied buffer of size bytes.
82e5a82f 2010 * If necessary the buffer's size is increased using realloc()
e7332f96
BE
2011 *
2012 * returns 0 if anything went fine and -1 otherwise
2013 *
2014 * NOTE: both buf and size may change, but even when -1 is returned
2015 * you still have to free() it yourself.
2016 */
2017int read_pipe(int fd, char** return_buf, unsigned long* return_size)
024510c8 2018{
e7332f96
BE
2019 char* buf = *return_buf;
2020 unsigned long size = *return_size;
2021 int iret;
024510c8 2022 unsigned long off = 0;
e7332f96 2023
024510c8 2024 do {
e7332f96 2025 iret = xread(fd, buf + off, size - off);
024510c8
DB
2026 if (iret > 0) {
2027 off += iret;
2028 if (off == size) {
2029 size *= 2;
83572c1a 2030 buf = xrealloc(buf, size);
024510c8
DB
2031 }
2032 }
2033 } while (iret > 0);
e7332f96
BE
2034
2035 *return_buf = buf;
2036 *return_size = off;
2037
2038 if (iret < 0)
2039 return -1;
2040 return 0;
2041}
2042
2043int index_pipe(unsigned char *sha1, int fd, const char *type, int write_object)
2044{
2045 unsigned long size = 4096;
2d7320d0 2046 char *buf = xmalloc(size);
e7332f96 2047 int ret;
e7332f96
BE
2048
2049 if (read_pipe(fd, &buf, &size)) {
024510c8
DB
2050 free(buf);
2051 return -1;
2052 }
e7332f96 2053
024510c8 2054 if (!type)
8e440259 2055 type = blob_type;
024510c8 2056 if (write_object)
e7332f96 2057 ret = write_sha1_file(buf, size, type, sha1);
abdc3fc8
RS
2058 else
2059 ret = hash_sha1_file(buf, size, type, sha1);
024510c8
DB
2060 free(buf);
2061 return ret;
2062}
2063
7672db20 2064int index_fd(unsigned char *sha1, int fd, struct stat *st, int write_object, const char *type)
74400e71 2065{
74400e71 2066 unsigned long size = st->st_size;
aac17941 2067 void *buf;
6c510bee 2068 int ret, re_allocated = 0;
74400e71 2069
aac17941 2070 buf = "";
74400e71 2071 if (size)
c4712e45 2072 buf = xmmap(NULL, size, PROT_READ, MAP_PRIVATE, fd, 0);
74400e71 2073 close(fd);
74400e71 2074
7672db20 2075 if (!type)
8e440259 2076 type = blob_type;
6c510bee
LT
2077
2078 /*
2079 * Convert blobs to git internal format
2080 */
2081 if (!strcmp(type, blob_type)) {
2082 unsigned long nsize = size;
2083 char *nbuf = buf;
2084 if (convert_to_git(NULL, &nbuf, &nsize)) {
2085 if (size)
2086 munmap(buf, size);
2087 size = nsize;
2088 buf = nbuf;
2089 re_allocated = 1;
2090 }
2091 }
2092
7672db20
BL
2093 if (write_object)
2094 ret = write_sha1_file(buf, size, type, sha1);
abdc3fc8
RS
2095 else
2096 ret = hash_sha1_file(buf, size, type, sha1);
6c510bee
LT
2097 if (re_allocated) {
2098 free(buf);
2099 return ret;
2100 }
aac17941
LT
2101 if (size)
2102 munmap(buf, size);
2103 return ret;
74400e71 2104}
ec1fcc16
JH
2105
2106int index_path(unsigned char *sha1, const char *path, struct stat *st, int write_object)
2107{
2108 int fd;
2109 char *target;
2110
2111 switch (st->st_mode & S_IFMT) {
2112 case S_IFREG:
2113 fd = open(path, O_RDONLY);
2114 if (fd < 0)
2115 return error("open(\"%s\"): %s", path,
2116 strerror(errno));
2117 if (index_fd(sha1, fd, st, write_object, NULL) < 0)
2118 return error("%s: failed to insert into database",
2119 path);
2120 break;
2121 case S_IFLNK:
2122 target = xmalloc(st->st_size+1);
2123 if (readlink(path, target, st->st_size+1) != st->st_size) {
2124 char *errstr = strerror(errno);
2125 free(target);
2126 return error("readlink(\"%s\"): %s", path,
2127 errstr);
2128 }
abdc3fc8
RS
2129 if (!write_object)
2130 hash_sha1_file(target, st->st_size, blob_type, sha1);
2131 else if (write_sha1_file(target, st->st_size, blob_type, sha1))
ec1fcc16
JH
2132 return error("%s: failed to insert into database",
2133 path);
2134 free(target);
2135 break;
2136 default:
2137 return error("%s: unsupported file type", path);
2138 }
2139 return 0;
2140}
a69e5429
JH
2141
2142int read_pack_header(int fd, struct pack_header *header)
2143{
2144 char *c = (char*)header;
2145 ssize_t remaining = sizeof(struct pack_header);
2146 do {
2147 ssize_t r = xread(fd, c, remaining);
2148 if (r <= 0)
2149 /* "eof before pack header was fully read" */
2150 return PH_ERROR_EOF;
2151 remaining -= r;
2152 c += r;
2153 } while (remaining > 0);
2154 if (header->hdr_signature != htonl(PACK_SIGNATURE))
2155 /* "protocol error (pack signature mismatch detected)" */
2156 return PH_ERROR_PACK_SIGNATURE;
2157 if (!pack_version_ok(header->hdr_version))
2158 /* "protocol error (pack version unsupported)" */
2159 return PH_ERROR_PROTOCOL;
2160 return 0;
2161}