Refactor open_packed_git to return an error code.
[git/git.git] / sha1_file.c
CommitLineData
0fcfd160
LT
1/*
2 * GIT - The information manager from hell
3 *
4 * Copyright (C) Linus Torvalds, 2005
5 *
6 * This handles basic git sha1 object files - packing, unpacking,
7 * creation etc.
8 */
0fcfd160 9#include "cache.h"
1f688557 10#include "delta.h"
a733cb60 11#include "pack.h"
8e440259
PE
12#include "blob.h"
13#include "commit.h"
14#include "tag.h"
15#include "tree.h"
0fcfd160 16
144bde78
LT
17#ifndef O_NOATIME
18#if defined(__linux__) && (defined(__i386__) || defined(__PPC__))
19#define O_NOATIME 01000000
20#else
21#define O_NOATIME 0
22#endif
23#endif
24
e05db0fd
PR
25#ifdef NO_C99_FORMAT
26#define SZ_FMT "lu"
27#else
28#define SZ_FMT "zu"
29#endif
30
96f1e58f 31const unsigned char null_sha1[20];
88cd621d 32
144bde78
LT
33static unsigned int sha1_file_open_flag = O_NOATIME;
34
e49521b5
JH
35signed char hexval_table[256] = {
36 -1, -1, -1, -1, -1, -1, -1, -1, /* 00-07 */
37 -1, -1, -1, -1, -1, -1, -1, -1, /* 08-0f */
38 -1, -1, -1, -1, -1, -1, -1, -1, /* 10-17 */
39 -1, -1, -1, -1, -1, -1, -1, -1, /* 18-1f */
40 -1, -1, -1, -1, -1, -1, -1, -1, /* 20-27 */
41 -1, -1, -1, -1, -1, -1, -1, -1, /* 28-2f */
42 0, 1, 2, 3, 4, 5, 6, 7, /* 30-37 */
43 8, 9, -1, -1, -1, -1, -1, -1, /* 38-3f */
44 -1, 10, 11, 12, 13, 14, 15, -1, /* 40-47 */
45 -1, -1, -1, -1, -1, -1, -1, -1, /* 48-4f */
46 -1, -1, -1, -1, -1, -1, -1, -1, /* 50-57 */
47 -1, -1, -1, -1, -1, -1, -1, -1, /* 58-5f */
48 -1, 10, 11, 12, 13, 14, 15, -1, /* 60-67 */
49 -1, -1, -1, -1, -1, -1, -1, -1, /* 68-67 */
50 -1, -1, -1, -1, -1, -1, -1, -1, /* 70-77 */
51 -1, -1, -1, -1, -1, -1, -1, -1, /* 78-7f */
52 -1, -1, -1, -1, -1, -1, -1, -1, /* 80-87 */
53 -1, -1, -1, -1, -1, -1, -1, -1, /* 88-8f */
54 -1, -1, -1, -1, -1, -1, -1, -1, /* 90-97 */
55 -1, -1, -1, -1, -1, -1, -1, -1, /* 98-9f */
56 -1, -1, -1, -1, -1, -1, -1, -1, /* a0-a7 */
57 -1, -1, -1, -1, -1, -1, -1, -1, /* a8-af */
58 -1, -1, -1, -1, -1, -1, -1, -1, /* b0-b7 */
59 -1, -1, -1, -1, -1, -1, -1, -1, /* b8-bf */
60 -1, -1, -1, -1, -1, -1, -1, -1, /* c0-c7 */
61 -1, -1, -1, -1, -1, -1, -1, -1, /* c8-cf */
62 -1, -1, -1, -1, -1, -1, -1, -1, /* d0-d7 */
63 -1, -1, -1, -1, -1, -1, -1, -1, /* d8-df */
64 -1, -1, -1, -1, -1, -1, -1, -1, /* e0-e7 */
65 -1, -1, -1, -1, -1, -1, -1, -1, /* e8-ef */
66 -1, -1, -1, -1, -1, -1, -1, -1, /* f0-f7 */
67 -1, -1, -1, -1, -1, -1, -1, -1, /* f8-ff */
68};
0fcfd160
LT
69
70int get_sha1_hex(const char *hex, unsigned char *sha1)
71{
72 int i;
73 for (i = 0; i < 20; i++) {
74 unsigned int val = (hexval(hex[0]) << 4) | hexval(hex[1]);
75 if (val & ~0xff)
76 return -1;
77 *sha1++ = val;
78 hex += 2;
79 }
80 return 0;
81}
82
b2cb9425
JH
83int safe_create_leading_directories(char *path)
84{
85 char *pos = path;
67d42212
JR
86 struct stat st;
87
67ffdf4c
JS
88 if (*pos == '/')
89 pos++;
b2cb9425
JH
90
91 while (pos) {
92 pos = strchr(pos, '/');
93 if (!pos)
94 break;
95 *pos = 0;
67d42212
JR
96 if (!stat(path, &st)) {
97 /* path exists */
98 if (!S_ISDIR(st.st_mode)) {
b2cb9425 99 *pos = '/';
67d42212 100 return -3;
b2cb9425 101 }
457f06d6 102 }
67d42212
JR
103 else if (mkdir(path, 0777)) {
104 *pos = '/';
105 return -1;
106 }
457f06d6
JS
107 else if (adjust_shared_perm(path)) {
108 *pos = '/';
109 return -2;
110 }
b2cb9425
JH
111 *pos++ = '/';
112 }
113 return 0;
114}
723c31fe 115
0fcfd160
LT
116char * sha1_to_hex(const unsigned char *sha1)
117{
dcb3450f
LT
118 static int bufno;
119 static char hexbuffer[4][50];
0fcfd160 120 static const char hex[] = "0123456789abcdef";
dcb3450f 121 char *buffer = hexbuffer[3 & ++bufno], *buf = buffer;
0fcfd160
LT
122 int i;
123
124 for (i = 0; i < 20; i++) {
125 unsigned int val = *sha1++;
126 *buf++ = hex[val >> 4];
127 *buf++ = hex[val & 0xf];
128 }
1e80e044
JS
129 *buf = '\0';
130
0fcfd160
LT
131 return buffer;
132}
133
ace1534d
JH
134static void fill_sha1_path(char *pathbuf, const unsigned char *sha1)
135{
136 int i;
137 for (i = 0; i < 20; i++) {
138 static char hex[] = "0123456789abcdef";
139 unsigned int val = sha1[i];
140 char *pos = pathbuf + i*2 + (i > 0);
141 *pos++ = hex[val >> 4];
142 *pos = hex[val & 0xf];
143 }
144}
145
0fcfd160
LT
146/*
147 * NOTE! This returns a statically allocated buffer, so you have to be
9befac47 148 * careful about using it. Do a "xstrdup()" if you need to save the
0fcfd160 149 * filename.
ace1534d
JH
150 *
151 * Also note that this returns the location for creating. Reading
152 * SHA1 file can happen from any alternate directory listed in the
d19938ab 153 * DB_ENVIRONMENT environment variable if it is not found in
ace1534d 154 * the primary object database.
0fcfd160
LT
155 */
156char *sha1_file_name(const unsigned char *sha1)
157{
0fcfd160
LT
158 static char *name, *base;
159
160 if (!base) {
d19938ab 161 const char *sha1_file_directory = get_object_directory();
0fcfd160 162 int len = strlen(sha1_file_directory);
812666c8 163 base = xmalloc(len + 60);
0fcfd160
LT
164 memcpy(base, sha1_file_directory, len);
165 memset(base+len, 0, 60);
166 base[len] = '/';
167 base[len+3] = '/';
168 name = base + len + 1;
169 }
ace1534d 170 fill_sha1_path(name, sha1);
0fcfd160
LT
171 return base;
172}
173
bf592c50
DB
174char *sha1_pack_name(const unsigned char *sha1)
175{
176 static const char hex[] = "0123456789abcdef";
177 static char *name, *base, *buf;
178 int i;
179
180 if (!base) {
181 const char *sha1_file_directory = get_object_directory();
182 int len = strlen(sha1_file_directory);
183 base = xmalloc(len + 60);
184 sprintf(base, "%s/pack/pack-1234567890123456789012345678901234567890.pack", sha1_file_directory);
185 name = base + len + 11;
186 }
187
188 buf = name;
189
190 for (i = 0; i < 20; i++) {
191 unsigned int val = *sha1++;
192 *buf++ = hex[val >> 4];
193 *buf++ = hex[val & 0xf];
194 }
195
196 return base;
197}
198
199char *sha1_pack_index_name(const unsigned char *sha1)
200{
201 static const char hex[] = "0123456789abcdef";
202 static char *name, *base, *buf;
203 int i;
204
205 if (!base) {
206 const char *sha1_file_directory = get_object_directory();
207 int len = strlen(sha1_file_directory);
208 base = xmalloc(len + 60);
209 sprintf(base, "%s/pack/pack-1234567890123456789012345678901234567890.idx", sha1_file_directory);
210 name = base + len + 11;
211 }
212
213 buf = name;
214
215 for (i = 0; i < 20; i++) {
216 unsigned int val = *sha1++;
217 *buf++ = hex[val >> 4];
218 *buf++ = hex[val & 0xf];
219 }
220
221 return base;
222}
223
d5a63b99
JH
224struct alternate_object_database *alt_odb_list;
225static struct alternate_object_database **alt_odb_tail;
ace1534d 226
c2f493a4
MW
227static void read_info_alternates(const char * alternates, int depth);
228
ddd5d056
JH
229/*
230 * Prepare alternate object database registry.
d5a63b99
JH
231 *
232 * The variable alt_odb_list points at the list of struct
233 * alternate_object_database. The elements on this list come from
234 * non-empty elements from colon separated ALTERNATE_DB_ENVIRONMENT
235 * environment variable, and $GIT_OBJECT_DIRECTORY/info/alternates,
1494e038
JH
236 * whose contents is similar to that environment variable but can be
237 * LF separated. Its base points at a statically allocated buffer that
d5a63b99
JH
238 * contains "/the/directory/corresponding/to/.git/objects/...", while
239 * its name points just after the slash at the end of ".git/objects/"
240 * in the example above, and has enough space to hold 40-byte hex
241 * SHA1, an extra slash for the first level indirection, and the
242 * terminating NUL.
ddd5d056 243 */
c2f493a4 244static int link_alt_odb_entry(const char * entry, int len, const char * relative_base, int depth)
ace1534d 245{
c2f493a4 246 struct stat st;
1494e038 247 const char *objdir = get_object_directory();
c2f493a4
MW
248 struct alternate_object_database *ent;
249 struct alternate_object_database *alt;
250 /* 43 = 40-byte + 2 '/' + terminating NUL */
251 int pfxlen = len;
252 int entlen = pfxlen + 43;
ccfd3e99 253 int base_len = -1;
d5a63b99 254
c2f493a4
MW
255 if (*entry != '/' && relative_base) {
256 /* Relative alt-odb */
257 if (base_len < 0)
258 base_len = strlen(relative_base) + 1;
259 entlen += base_len;
260 pfxlen += base_len;
261 }
262 ent = xmalloc(sizeof(*ent) + entlen);
263
264 if (*entry != '/' && relative_base) {
265 memcpy(ent->base, relative_base, base_len - 1);
266 ent->base[base_len - 1] = '/';
267 memcpy(ent->base + base_len, entry, len);
268 }
269 else
270 memcpy(ent->base, entry, pfxlen);
271
272 ent->name = ent->base + pfxlen + 1;
273 ent->base[pfxlen + 3] = '/';
274 ent->base[pfxlen] = ent->base[entlen-1] = 0;
275
276 /* Detect cases where alternate disappeared */
277 if (stat(ent->base, &st) || !S_ISDIR(st.st_mode)) {
278 error("object directory %s does not exist; "
279 "check .git/objects/info/alternates.",
280 ent->base);
281 free(ent);
282 return -1;
283 }
284
285 /* Prevent the common mistake of listing the same
286 * thing twice, or object directory itself.
287 */
288 for (alt = alt_odb_list; alt; alt = alt->next) {
289 if (!memcmp(ent->base, alt->base, pfxlen)) {
290 free(ent);
291 return -1;
292 }
293 }
294 if (!memcmp(ent->base, objdir, pfxlen)) {
295 free(ent);
296 return -1;
297 }
298
299 /* add the alternate entry */
300 *alt_odb_tail = ent;
301 alt_odb_tail = &(ent->next);
302 ent->next = NULL;
303
304 /* recursively add alternates */
305 read_info_alternates(ent->base, depth + 1);
306
307 ent->base[pfxlen] = '/';
308
309 return 0;
310}
311
312static void link_alt_odb_entries(const char *alt, const char *ep, int sep,
313 const char *relative_base, int depth)
314{
315 const char *cp, *last;
316
317 if (depth > 5) {
318 error("%s: ignoring alternate object stores, nesting too deep.",
319 relative_base);
320 return;
321 }
322
d5a63b99 323 last = alt;
9577e7e3
JH
324 while (last < ep) {
325 cp = last;
326 if (cp < ep && *cp == '#') {
327 while (cp < ep && *cp != sep)
328 cp++;
329 last = cp + 1;
330 continue;
331 }
c2f493a4
MW
332 while (cp < ep && *cp != sep)
333 cp++;
d5a63b99 334 if (last != cp) {
c2f493a4
MW
335 if ((*last != '/') && depth) {
336 error("%s: ignoring relative alternate object store %s",
337 relative_base, last);
338 } else {
339 link_alt_odb_entry(last, cp - last,
340 relative_base, depth);
1494e038 341 }
d5a63b99 342 }
9577e7e3 343 while (cp < ep && *cp == sep)
d5a63b99
JH
344 cp++;
345 last = cp;
9577e7e3 346 }
d5a63b99
JH
347}
348
c2f493a4 349static void read_info_alternates(const char * relative_base, int depth)
d5a63b99 350{
9577e7e3 351 char *map;
d5a63b99 352 struct stat st;
c2f493a4
MW
353 char path[PATH_MAX];
354 int fd;
d5a63b99 355
c2f493a4 356 sprintf(path, "%s/info/alternates", relative_base);
d5a63b99
JH
357 fd = open(path, O_RDONLY);
358 if (fd < 0)
359 return;
360 if (fstat(fd, &st) || (st.st_size == 0)) {
361 close(fd);
9a217f2a 362 return;
ace1534d 363 }
c4712e45 364 map = xmmap(NULL, st.st_size, PROT_READ, MAP_PRIVATE, fd, 0);
d5a63b99 365 close(fd);
d5a63b99 366
c2f493a4
MW
367 link_alt_odb_entries(map, map + st.st_size, '\n', relative_base, depth);
368
d5a63b99 369 munmap(map, st.st_size);
ace1534d
JH
370}
371
c2f493a4
MW
372void prepare_alt_odb(void)
373{
554fe20d 374 const char *alt;
c2f493a4
MW
375
376 alt = getenv(ALTERNATE_DB_ENVIRONMENT);
377 if (!alt) alt = "";
378
379 if (alt_odb_tail)
380 return;
381 alt_odb_tail = &alt_odb_list;
382 link_alt_odb_entries(alt, alt + strlen(alt), ':', NULL, 0);
383
384 read_info_alternates(get_object_directory(), 0);
385}
386
ace1534d
JH
387static char *find_sha1_file(const unsigned char *sha1, struct stat *st)
388{
ace1534d 389 char *name = sha1_file_name(sha1);
d5a63b99 390 struct alternate_object_database *alt;
ace1534d
JH
391
392 if (!stat(name, st))
393 return name;
9a217f2a 394 prepare_alt_odb();
d5a63b99
JH
395 for (alt = alt_odb_list; alt; alt = alt->next) {
396 name = alt->name;
ace1534d 397 fill_sha1_path(name, sha1);
d5a63b99
JH
398 if (!stat(alt->base, st))
399 return alt->base;
ace1534d
JH
400 }
401 return NULL;
402}
403
60bb8b14 404static unsigned int pack_used_ctr;
a53128b6
SP
405static unsigned int pack_mmap_calls;
406static unsigned int peak_pack_open_windows;
407static unsigned int pack_open_windows;
408static size_t peak_pack_mapped;
60bb8b14
SP
409static size_t pack_mapped;
410static size_t page_size;
9a217f2a 411struct packed_git *packed_git;
1f688557 412
a53128b6
SP
413void pack_report()
414{
415 fprintf(stderr,
e05db0fd
PR
416 "pack_report: getpagesize() = %10" SZ_FMT "\n"
417 "pack_report: core.packedGitWindowSize = %10" SZ_FMT "\n"
418 "pack_report: core.packedGitLimit = %10" SZ_FMT "\n",
a53128b6
SP
419 page_size,
420 packed_git_window_size,
421 packed_git_limit);
422 fprintf(stderr,
423 "pack_report: pack_used_ctr = %10u\n"
424 "pack_report: pack_mmap_calls = %10u\n"
425 "pack_report: pack_open_windows = %10u / %10u\n"
e05db0fd
PR
426 "pack_report: pack_mapped = "
427 "%10" SZ_FMT " / %10" SZ_FMT "\n",
a53128b6
SP
428 pack_used_ctr,
429 pack_mmap_calls,
430 pack_open_windows, peak_pack_open_windows,
431 pack_mapped, peak_pack_mapped);
432}
433
1f688557
JH
434static int check_packed_git_idx(const char *path, unsigned long *idx_size_,
435 void **idx_map_)
436{
437 void *idx_map;
b18b00a6 438 uint32_t *index;
1f688557
JH
439 unsigned long idx_size;
440 int nr, i;
e93ec6f9 441 int fd = open(path, O_RDONLY);
1f688557
JH
442 struct stat st;
443 if (fd < 0)
444 return -1;
445 if (fstat(fd, &st)) {
446 close(fd);
447 return -1;
448 }
449 idx_size = st.st_size;
c4712e45 450 idx_map = xmmap(NULL, idx_size, PROT_READ, MAP_PRIVATE, fd, 0);
1f688557 451 close(fd);
1f688557
JH
452
453 index = idx_map;
4d235c80
LT
454 *idx_map_ = idx_map;
455 *idx_size_ = idx_size;
1f688557
JH
456
457 /* check index map */
f9253394 458 if (idx_size < 4*256 + 20 + 20)
df1b059d
SP
459 return error("index file %s is too small", path);
460
461 /* a future index format would start with this, as older git
462 * binaries would fail the non-monotonic index check below.
463 * give a nicer warning to the user if we can.
464 */
465 if (index[0] == htonl(PACK_IDX_SIGNATURE))
466 return error("index file %s is a newer version"
467 " and is not supported by this binary"
468 " (try upgrading GIT to a newer version)",
469 path);
470
1f688557
JH
471 nr = 0;
472 for (i = 0; i < 256; i++) {
473 unsigned int n = ntohl(index[i]);
474 if (n < nr)
df1b059d 475 return error("non-monotonic index %s", path);
1f688557
JH
476 nr = n;
477 }
478
479 /*
480 * Total size:
481 * - 256 index entries 4 bytes each
482 * - 24-byte entries * nr (20-byte sha1 + 4-byte offset)
483 * - 20-byte SHA1 of the packfile
484 * - 20-byte SHA1 file checksum
485 */
486 if (idx_size != 4*256 + nr * 24 + 20 + 20)
df1b059d 487 return error("wrong index file size in %s", path);
1f688557 488
1f688557
JH
489 return 0;
490}
491
11daf39b
SP
492static void scan_windows(struct packed_git *p,
493 struct packed_git **lru_p,
494 struct pack_window **lru_w,
495 struct pack_window **lru_l)
1f688557 496{
11daf39b
SP
497 struct pack_window *w, *w_l;
498
499 for (w_l = NULL, w = p->windows; w; w = w->next) {
500 if (!w->inuse_cnt) {
501 if (!*lru_w || w->last_used < (*lru_w)->last_used) {
502 *lru_p = p;
503 *lru_w = w;
504 *lru_l = w_l;
54044bf8 505 }
54044bf8 506 }
11daf39b 507 w_l = w;
f9253394 508 }
11daf39b
SP
509}
510
511static int unuse_one_window(struct packed_git *current)
512{
513 struct packed_git *p, *lru_p = NULL;
514 struct pack_window *lru_w = NULL, *lru_l = NULL;
515
516 if (current)
517 scan_windows(current, &lru_p, &lru_w, &lru_l);
518 for (p = packed_git; p; p = p->next)
519 scan_windows(p, &lru_p, &lru_w, &lru_l);
54044bf8
SP
520 if (lru_p) {
521 munmap(lru_w->base, lru_w->len);
522 pack_mapped -= lru_w->len;
523 if (lru_l)
524 lru_l->next = lru_w->next;
525 else {
526 lru_p->windows = lru_w->next;
11daf39b 527 if (!lru_p->windows && lru_p != current) {
54044bf8
SP
528 close(lru_p->pack_fd);
529 lru_p->pack_fd = -1;
530 }
531 }
532 free(lru_w);
a53128b6 533 pack_open_windows--;
54044bf8
SP
534 return 1;
535 }
536 return 0;
f9253394
JH
537}
538
97bfeb34
SP
539void release_pack_memory(size_t need)
540{
541 size_t cur = pack_mapped;
542 while (need >= (cur - pack_mapped) && unuse_one_window(NULL))
543 ; /* nothing */
544}
545
03e79c88 546void unuse_pack(struct pack_window **w_cursor)
f9253394 547{
03e79c88
SP
548 struct pack_window *w = *w_cursor;
549 if (w) {
550 w->inuse_cnt--;
551 *w_cursor = NULL;
552 }
1f688557
JH
553}
554
072db278 555static int open_packed_git(struct packed_git *p)
1f688557 556{
9bc879c1
SP
557 struct stat st;
558 struct pack_header hdr;
559 unsigned char sha1[20];
560 unsigned char *idx_sha1;
2c039da8 561 long fd_flag;
9bc879c1
SP
562
563 p->pack_fd = open(p->pack_name, O_RDONLY);
564 if (p->pack_fd < 0 || fstat(p->pack_fd, &st))
072db278 565 return -1;
9bc879c1
SP
566
567 /* If we created the struct before we had the pack we lack size. */
bf592c50 568 if (!p->pack_size) {
bf592c50 569 if (!S_ISREG(st.st_mode))
072db278 570 return error("packfile %s not a regular file", p->pack_name);
bf592c50 571 p->pack_size = st.st_size;
9bc879c1 572 } else if (p->pack_size != st.st_size)
072db278 573 return error("packfile %s size changed", p->pack_name);
9bc879c1 574
2c039da8
JH
575 /* We leave these file descriptors open with sliding mmap;
576 * there is no point keeping them open across exec(), though.
577 */
578 fd_flag = fcntl(p->pack_fd, F_GETFD, 0);
579 if (fd_flag < 0)
072db278 580 return error("cannot determine file descriptor flags");
2c039da8
JH
581 fd_flag |= FD_CLOEXEC;
582 if (fcntl(p->pack_fd, F_SETFD, fd_flag) == -1)
072db278 583 return error("cannot set FD_CLOEXEC");
2c039da8 584
9bc879c1 585 /* Verify we recognize this pack file format. */
e6e2bd62 586 if (read_in_full(p->pack_fd, &hdr, sizeof(hdr)) != sizeof(hdr))
072db278 587 return error("file %s is far too short to be a packfile", p->pack_name);
9bc879c1 588 if (hdr.hdr_signature != htonl(PACK_SIGNATURE))
072db278 589 return error("file %s is not a GIT packfile", p->pack_name);
9bc879c1 590 if (!pack_version_ok(hdr.hdr_version))
072db278 591 return error("packfile %s is version %u and not supported"
9bc879c1
SP
592 " (try upgrading GIT to a newer version)",
593 p->pack_name, ntohl(hdr.hdr_version));
594
595 /* Verify the pack matches its index. */
596 if (num_packed_objects(p) != ntohl(hdr.hdr_entries))
072db278 597 return error("packfile %s claims to have %u objects"
9bc879c1
SP
598 " while index size indicates %u objects",
599 p->pack_name, ntohl(hdr.hdr_entries),
600 num_packed_objects(p));
601 if (lseek(p->pack_fd, p->pack_size - sizeof(sha1), SEEK_SET) == -1)
072db278 602 return error("end of packfile %s is unavailable", p->pack_name);
e6e2bd62 603 if (read_in_full(p->pack_fd, sha1, sizeof(sha1)) != sizeof(sha1))
072db278 604 return error("packfile %s signature is unavailable", p->pack_name);
9bc879c1
SP
605 idx_sha1 = ((unsigned char *)p->index_base) + p->index_size - 40;
606 if (hashcmp(sha1, idx_sha1))
072db278
SP
607 return error("packfile %s does not match index", p->pack_name);
608 return 0;
9bc879c1
SP
609}
610
60bb8b14
SP
611static int in_window(struct pack_window *win, unsigned long offset)
612{
613 /* We must promise at least 20 bytes (one hash) after the
614 * offset is available from this window, otherwise the offset
615 * is not actually in this window and a different window (which
616 * has that one hash excess) must be used. This is to support
617 * the object header and delta base parsing routines below.
618 */
619 off_t win_off = win->offset;
620 return win_off <= offset
621 && (offset + 20) <= (win_off + win->len);
622}
623
03e79c88
SP
624unsigned char* use_pack(struct packed_git *p,
625 struct pack_window **w_cursor,
626 unsigned long offset,
627 unsigned int *left)
9bc879c1 628{
60bb8b14 629 struct pack_window *win = *w_cursor;
03e79c88 630
072db278
SP
631 if (p->pack_fd == -1 && open_packed_git(p))
632 die("packfile %s cannot be accessed", p->pack_name);
60bb8b14
SP
633
634 /* Since packfiles end in a hash of their content and its
635 * pointless to ask for an offset into the middle of that
636 * hash, and the in_window function above wouldn't match
637 * don't allow an offset too close to the end of the file.
638 */
639 if (offset > (p->pack_size - 20))
640 die("offset beyond end of packfile (truncated pack?)");
641
642 if (!win || !in_window(win, offset)) {
643 if (win)
644 win->inuse_cnt--;
645 for (win = p->windows; win; win = win->next) {
646 if (in_window(win, offset))
647 break;
648 }
649 if (!win) {
650 if (!page_size)
651 page_size = getpagesize();
652 win = xcalloc(1, sizeof(*win));
653 win->offset = (offset / page_size) * page_size;
654 win->len = p->pack_size - win->offset;
655 if (win->len > packed_git_window_size)
656 win->len = packed_git_window_size;
657 pack_mapped += win->len;
11daf39b
SP
658 while (packed_git_limit < pack_mapped
659 && unuse_one_window(p))
60bb8b14 660 ; /* nothing */
c4712e45 661 win->base = xmmap(NULL, win->len,
60bb8b14
SP
662 PROT_READ, MAP_PRIVATE,
663 p->pack_fd, win->offset);
664 if (win->base == MAP_FAILED)
73b4e4be
SP
665 die("packfile %s cannot be mapped: %s",
666 p->pack_name,
667 strerror(errno));
a53128b6
SP
668 pack_mmap_calls++;
669 pack_open_windows++;
670 if (pack_mapped > peak_pack_mapped)
671 peak_pack_mapped = pack_mapped;
672 if (pack_open_windows > peak_pack_open_windows)
673 peak_pack_open_windows = pack_open_windows;
60bb8b14
SP
674 win->next = p->windows;
675 p->windows = win;
676 }
1f688557 677 }
03e79c88
SP
678 if (win != *w_cursor) {
679 win->last_used = pack_used_ctr++;
680 win->inuse_cnt++;
681 *w_cursor = win;
682 }
60bb8b14 683 offset -= win->offset;
03e79c88
SP
684 if (left)
685 *left = win->len - offset;
686 return win->base + offset;
1f688557
JH
687}
688
9d835df2 689struct packed_git *add_packed_git(char *path, int path_len, int local)
1f688557
JH
690{
691 struct stat st;
692 struct packed_git *p;
693 unsigned long idx_size;
694 void *idx_map;
c0bbbb1b 695 unsigned char sha1[20];
1f688557
JH
696
697 if (check_packed_git_idx(path, &idx_size, &idx_map))
698 return NULL;
699
700 /* do we have a corresponding .pack file? */
701 strcpy(path + path_len - 4, ".pack");
702 if (stat(path, &st) || !S_ISREG(st.st_mode)) {
703 munmap(idx_map, idx_size);
704 return NULL;
705 }
706 /* ok, it looks sane as far as we can check without
707 * actually mapping the pack file.
708 */
709 p = xmalloc(sizeof(*p) + path_len + 2);
710 strcpy(p->pack_name, path);
711 p->index_size = idx_size;
712 p->pack_size = st.st_size;
713 p->index_base = idx_map;
714 p->next = NULL;
c41ee586 715 p->windows = NULL;
9bc879c1 716 p->pack_fd = -1;
9d835df2 717 p->pack_local = local;
f4a11066 718 if ((path_len > 44) && !get_sha1_hex(path + path_len - 44, sha1))
e702496e 719 hashcpy(p->sha1, sha1);
1f688557
JH
720 return p;
721}
722
bf592c50 723struct packed_git *parse_pack_index(unsigned char *sha1)
c508df5e
DB
724{
725 char *path = sha1_pack_index_name(sha1);
726 return parse_pack_index_file(sha1, path);
727}
728
2ab141a2 729struct packed_git *parse_pack_index_file(const unsigned char *sha1, char *idx_path)
bf592c50
DB
730{
731 struct packed_git *p;
732 unsigned long idx_size;
733 void *idx_map;
c508df5e 734 char *path;
bf592c50 735
c508df5e 736 if (check_packed_git_idx(idx_path, &idx_size, &idx_map))
bf592c50
DB
737 return NULL;
738
739 path = sha1_pack_name(sha1);
740
741 p = xmalloc(sizeof(*p) + strlen(path) + 2);
742 strcpy(p->pack_name, path);
743 p->index_size = idx_size;
744 p->pack_size = 0;
745 p->index_base = idx_map;
746 p->next = NULL;
c41ee586 747 p->windows = NULL;
9bc879c1 748 p->pack_fd = -1;
e702496e 749 hashcpy(p->sha1, sha1);
bf592c50
DB
750 return p;
751}
752
753void install_packed_git(struct packed_git *pack)
754{
755 pack->next = packed_git;
756 packed_git = pack;
757}
758
9d835df2 759static void prepare_packed_git_one(char *objdir, int local)
1f688557
JH
760{
761 char path[PATH_MAX];
762 int len;
763 DIR *dir;
764 struct dirent *de;
765
766 sprintf(path, "%s/pack", objdir);
767 len = strlen(path);
768 dir = opendir(path);
b5b16990 769 if (!dir) {
26125f6b 770 if (errno != ENOENT)
bd2afde8 771 error("unable to open object pack directory: %s: %s",
26125f6b 772 path, strerror(errno));
1f688557 773 return;
b5b16990 774 }
1f688557
JH
775 path[len++] = '/';
776 while ((de = readdir(dir)) != NULL) {
777 int namelen = strlen(de->d_name);
778 struct packed_git *p;
779
5bb1cda5 780 if (!has_extension(de->d_name, ".idx"))
1f688557
JH
781 continue;
782
54a15a8d 783 /* Don't reopen a pack we already have. */
1f688557 784 strcpy(path + len, de->d_name);
86f7780c
JK
785 for (p = packed_git; p; p = p->next) {
786 if (!memcmp(path, p->pack_name, len + namelen - 4))
787 break;
788 }
789 if (p)
790 continue;
54a15a8d
SP
791 /* See if it really is a valid .idx file with corresponding
792 * .pack file that we can map.
793 */
9d835df2 794 p = add_packed_git(path, len + namelen, local);
1f688557
JH
795 if (!p)
796 continue;
625e9421 797 install_packed_git(p);
1f688557 798 }
5b35bcd5 799 closedir(dir);
1f688557
JH
800}
801
637cdd9d 802static int prepare_packed_git_run_once = 0;
9a217f2a 803void prepare_packed_git(void)
1f688557 804{
d5a63b99 805 struct alternate_object_database *alt;
1f688557 806
637cdd9d 807 if (prepare_packed_git_run_once)
1f688557 808 return;
9d835df2 809 prepare_packed_git_one(get_object_directory(), 1);
9a217f2a 810 prepare_alt_odb();
d5a63b99 811 for (alt = alt_odb_list; alt; alt = alt->next) {
1494e038 812 alt->name[-1] = 0;
9d835df2 813 prepare_packed_git_one(alt->base, 0);
1494e038 814 alt->name[-1] = '/';
1f688557 815 }
637cdd9d
JK
816 prepare_packed_git_run_once = 1;
817}
818
fc04c412 819void reprepare_packed_git(void)
637cdd9d
JK
820{
821 prepare_packed_git_run_once = 0;
822 prepare_packed_git();
1f688557
JH
823}
824
5d6ccf5c 825int check_sha1_signature(const unsigned char *sha1, void *map, unsigned long size, const char *type)
0fcfd160
LT
826{
827 unsigned char real_sha1[20];
7cfb5f36 828 hash_sha1_file(map, size, type, real_sha1);
a89fccd2 829 return hashcmp(sha1, real_sha1) ? -1 : 0;
0fcfd160
LT
830}
831
bb6b8e4f 832void *map_sha1_file(const unsigned char *sha1, unsigned long *size)
0fcfd160 833{
0fcfd160
LT
834 struct stat st;
835 void *map;
144bde78 836 int fd;
ace1534d
JH
837 char *filename = find_sha1_file(sha1, &st);
838
839 if (!filename) {
ace1534d
JH
840 return NULL;
841 }
0fcfd160 842
144bde78 843 fd = open(filename, O_RDONLY | sha1_file_open_flag);
0fcfd160 844 if (fd < 0) {
144bde78
LT
845 /* See if it works without O_NOATIME */
846 switch (sha1_file_open_flag) {
847 default:
848 fd = open(filename, O_RDONLY);
849 if (fd >= 0)
850 break;
851 /* Fallthrough */
852 case 0:
144bde78
LT
853 return NULL;
854 }
855
1f688557
JH
856 /* If it failed once, it will probably fail again.
857 * Stop using O_NOATIME
858 */
144bde78 859 sha1_file_open_flag = 0;
0fcfd160 860 }
c4712e45 861 map = xmmap(NULL, st.st_size, PROT_READ, MAP_PRIVATE, fd, 0);
0fcfd160 862 close(fd);
0fcfd160
LT
863 *size = st.st_size;
864 return map;
865}
866
bb6b8e4f
JH
867int legacy_loose_object(unsigned char *map)
868{
869 unsigned int word;
870
871 /*
872 * Is it a zlib-compressed buffer? If so, the first byte
873 * must be 0x78 (15-bit window size, deflated), and the
874 * first 16-bit word is evenly divisible by 31
875 */
876 word = (map[0] << 8) + map[1];
877 if (map[0] == 0x78 && !(word % 31))
878 return 1;
879 else
880 return 0;
881}
882
72518e9c 883unsigned long unpack_object_header_gently(const unsigned char *buf, unsigned long len, enum object_type *type, unsigned long *sizep)
c4483576 884{
ad1ed5ee 885 unsigned shift;
93821bd9 886 unsigned char c;
93821bd9 887 unsigned long size;
ad1ed5ee
JH
888 unsigned long used = 0;
889
890 c = buf[used++];
891 *type = (c >> 4) & 7;
892 size = c & 15;
893 shift = 4;
894 while (c & 0x80) {
895 if (len <= used)
896 return 0;
897 if (sizeof(long) * 8 <= shift)
898 return 0;
899 c = buf[used++];
900 size += (c & 0x7f) << shift;
901 shift += 7;
902 }
903 *sizep = size;
904 return used;
905}
906
907static int unpack_sha1_header(z_stream *stream, unsigned char *map, unsigned long mapsize, void *buffer, unsigned long bufsiz)
908{
909 unsigned long size, used;
910 static const char valid_loose_object_type[8] = {
911 0, /* OBJ_EXT */
912 1, 1, 1, 1, /* "commit", "tree", "blob", "tag" */
913 0, /* "delta" and others are invalid in a loose object */
93821bd9 914 };
ad1ed5ee 915 enum object_type type;
93821bd9 916
c4483576
LT
917 /* Get the data stream */
918 memset(stream, 0, sizeof(*stream));
919 stream->next_in = map;
920 stream->avail_in = mapsize;
921 stream->next_out = buffer;
93821bd9
LT
922 stream->avail_out = bufsiz;
923
bb6b8e4f 924 if (legacy_loose_object(map)) {
93821bd9
LT
925 inflateInit(stream);
926 return inflate(stream, 0);
927 }
928
ad1ed5ee
JH
929 used = unpack_object_header_gently(map, mapsize, &type, &size);
930 if (!used || !valid_loose_object_type[type])
93821bd9 931 return -1;
ad1ed5ee
JH
932 map += used;
933 mapsize -= used;
93821bd9
LT
934
935 /* Set up the stream for the rest.. */
936 stream->next_in = map;
937 stream->avail_in = mapsize;
c4483576 938 inflateInit(stream);
93821bd9
LT
939
940 /* And generate the fake traditional header */
ad1ed5ee
JH
941 stream->total_out = 1 + snprintf(buffer, bufsiz, "%s %lu",
942 type_names[type], size);
93821bd9 943 return 0;
c4483576
LT
944}
945
6da4016a 946static void *unpack_sha1_rest(z_stream *stream, void *buffer, unsigned long size)
5180cacc
LT
947{
948 int bytes = strlen(buffer) + 1;
d565b341 949 unsigned char *buf = xmalloc(1+size);
93821bd9 950 unsigned long n;
5180cacc 951
93821bd9
LT
952 n = stream->total_out - bytes;
953 if (n > size)
954 n = size;
955 memcpy(buf, (char *) buffer + bytes, n);
956 bytes = n;
5180cacc
LT
957 if (bytes < size) {
958 stream->next_out = buf + bytes;
959 stream->avail_out = size - bytes;
960 while (inflate(stream, Z_FINISH) == Z_OK)
961 /* nothing */;
962 }
963 buf[size] = 0;
964 inflateEnd(stream);
965 return buf;
966}
967
968/*
969 * We used to just use "sscanf()", but that's actually way
970 * too permissive for what we want to check. So do an anal
971 * object header parse by hand.
972 */
38d3874d 973static int parse_sha1_header(char *hdr, char *type, unsigned long *sizep)
5180cacc
LT
974{
975 int i;
976 unsigned long size;
977
978 /*
979 * The type can be at most ten bytes (including the
980 * terminating '\0' that we add), and is followed by
981 * a space.
982 */
983 i = 10;
984 for (;;) {
985 char c = *hdr++;
986 if (c == ' ')
987 break;
988 if (!--i)
989 return -1;
990 *type++ = c;
991 }
992 *type = 0;
993
994 /*
995 * The length must follow immediately, and be in canonical
996 * decimal format (ie "010" is not valid).
997 */
998 size = *hdr++ - '0';
999 if (size > 9)
1000 return -1;
1001 if (size) {
1002 for (;;) {
1003 unsigned long c = *hdr - '0';
1004 if (c > 9)
1005 break;
1006 hdr++;
1007 size = size * 10 + c;
1008 }
1009 }
1010 *sizep = size;
1011
1012 /*
1013 * The length must be followed by a zero byte
1014 */
1015 return *hdr ? -1 : 0;
1016}
1017
0fcfd160
LT
1018void * unpack_sha1_file(void *map, unsigned long mapsize, char *type, unsigned long *size)
1019{
5180cacc 1020 int ret;
0fcfd160 1021 z_stream stream;
5180cacc 1022 char hdr[8192];
0fcfd160 1023
5180cacc
LT
1024 ret = unpack_sha1_header(&stream, map, mapsize, hdr, sizeof(hdr));
1025 if (ret < Z_OK || parse_sha1_header(hdr, type, size) < 0)
0fcfd160
LT
1026 return NULL;
1027
5180cacc 1028 return unpack_sha1_rest(&stream, hdr, *size);
0fcfd160
LT
1029}
1030
eb32d236 1031static unsigned long get_delta_base(struct packed_git *p,
03e79c88 1032 struct pack_window **w_curs,
eb32d236
NP
1033 unsigned long offset,
1034 enum object_type kind,
1035 unsigned long delta_obj_offset,
1036 unsigned long *base_obj_offset)
1037{
03e79c88 1038 unsigned char *base_info = use_pack(p, w_curs, offset, NULL);
eb32d236
NP
1039 unsigned long base_offset;
1040
8d8a4ea5
SP
1041 /* use_pack() assured us we have [base_info, base_info + 20)
1042 * as a range that we can look at without walking off the
1043 * end of the mapped window. Its actually the hash size
1044 * that is assured. An OFS_DELTA longer than the hash size
1045 * is stupid, as then a REF_DELTA would be smaller to store.
1046 */
eb32d236
NP
1047 if (kind == OBJ_OFS_DELTA) {
1048 unsigned used = 0;
1049 unsigned char c = base_info[used++];
1050 base_offset = c & 127;
1051 while (c & 128) {
1052 base_offset += 1;
1053 if (!base_offset || base_offset & ~(~0UL >> 7))
1054 die("offset value overflow for delta base object");
1055 c = base_info[used++];
1056 base_offset = (base_offset << 7) + (c & 127);
1057 }
1058 base_offset = delta_obj_offset - base_offset;
1059 if (base_offset >= delta_obj_offset)
1060 die("delta base offset out of bound");
1061 offset += used;
1062 } else if (kind == OBJ_REF_DELTA) {
1063 /* The base entry _must_ be in the same pack */
1064 base_offset = find_pack_entry_one(base_info, p);
1065 if (!base_offset)
1066 die("failed to find delta-pack base object %s",
1067 sha1_to_hex(base_info));
1068 offset += 20;
1069 } else
1070 die("I am totally screwed");
1071 *base_obj_offset = base_offset;
1072 return offset;
1073}
1074
f3bf9224 1075/* forward declaration for a mutually recursive function */
43057304 1076static int packed_object_info(struct packed_git *p, unsigned long offset,
f3bf9224
JH
1077 char *type, unsigned long *sizep);
1078
43057304 1079static int packed_delta_info(struct packed_git *p,
03e79c88 1080 struct pack_window **w_curs,
43057304 1081 unsigned long offset,
eb32d236
NP
1082 enum object_type kind,
1083 unsigned long obj_offset,
5db47c2b 1084 char *type,
43057304 1085 unsigned long *sizep)
5db47c2b 1086{
43057304 1087 unsigned long base_offset;
f3bf9224 1088
03e79c88
SP
1089 offset = get_delta_base(p, w_curs, offset, kind,
1090 obj_offset, &base_offset);
f3bf9224 1091
c62266f3
JH
1092 /* We choose to only get the type of the base object and
1093 * ignore potentially corrupt pack file that expects the delta
1094 * based on a base with a wrong size. This saves tons of
1095 * inflate() calls.
1096 */
43057304 1097 if (packed_object_info(p, base_offset, type, NULL))
c62266f3 1098 die("cannot get info for delta-pack base");
5db47c2b 1099
c62266f3
JH
1100 if (sizep) {
1101 const unsigned char *data;
079afb18 1102 unsigned char delta_head[20], *in;
c62266f3
JH
1103 unsigned long result_size;
1104 z_stream stream;
1105 int st;
1106
1107 memset(&stream, 0, sizeof(stream));
c62266f3
JH
1108 stream.next_out = delta_head;
1109 stream.avail_out = sizeof(delta_head);
1110
1111 inflateInit(&stream);
079afb18
SP
1112 do {
1113 in = use_pack(p, w_curs, offset, &stream.avail_in);
1114 stream.next_in = in;
1115 st = inflate(&stream, Z_FINISH);
1116 offset += stream.next_in - in;
1117 } while ((st == Z_OK || st == Z_BUF_ERROR)
1118 && stream.total_out < sizeof(delta_head));
c62266f3
JH
1119 inflateEnd(&stream);
1120 if ((st != Z_STREAM_END) &&
1121 stream.total_out != sizeof(delta_head))
1122 die("delta data unpack-initial failed");
1123
1124 /* Examine the initial part of the delta to figure out
1125 * the result size.
1126 */
1127 data = delta_head;
8960844a
NP
1128
1129 /* ignore base size */
1130 get_delta_hdr_size(&data, delta_head+sizeof(delta_head));
5db47c2b 1131
c62266f3 1132 /* Read the result size */
8960844a 1133 result_size = get_delta_hdr_size(&data, delta_head+sizeof(delta_head));
c62266f3
JH
1134 *sizep = result_size;
1135 }
5db47c2b
JH
1136 return 0;
1137}
1138
03e79c88
SP
1139static unsigned long unpack_object_header(struct packed_git *p,
1140 struct pack_window **w_curs,
1141 unsigned long offset,
1142 enum object_type *type,
1143 unsigned long *sizep)
a733cb60 1144{
03e79c88
SP
1145 unsigned char *base;
1146 unsigned int left;
ad1ed5ee 1147 unsigned long used;
a733cb60 1148
8d8a4ea5
SP
1149 /* use_pack() assures us we have [base, base + 20) available
1150 * as a range that we can look at at. (Its actually the hash
1151 * size that is assurred.) With our object header encoding
1152 * the maximum deflated object size is 2^137, which is just
1153 * insane, so we know won't exceed what we have been given.
1154 */
03e79c88
SP
1155 base = use_pack(p, w_curs, offset, &left);
1156 used = unpack_object_header_gently(base, left, type, sizep);
ad1ed5ee
JH
1157 if (!used)
1158 die("object offset outside of pack file");
1159
1160 return offset + used;
a733cb60
LT
1161}
1162
43057304
NP
1163void packed_object_info_detail(struct packed_git *p,
1164 unsigned long offset,
ad8c80a5
JH
1165 char *type,
1166 unsigned long *size,
1167 unsigned long *store_size,
f8f135c9 1168 unsigned int *delta_chain_length,
ad8c80a5
JH
1169 unsigned char *base_sha1)
1170{
03e79c88 1171 struct pack_window *w_curs = NULL;
eb32d236 1172 unsigned long obj_offset, val;
43057304 1173 unsigned char *next_sha1;
ad8c80a5
JH
1174 enum object_type kind;
1175
43057304 1176 *delta_chain_length = 0;
eb32d236 1177 obj_offset = offset;
03e79c88 1178 offset = unpack_object_header(p, &w_curs, offset, &kind, size);
43057304
NP
1179
1180 for (;;) {
1181 switch (kind) {
1182 default:
08a19d87 1183 die("pack %s contains unknown object type %d",
43057304
NP
1184 p->pack_name, kind);
1185 case OBJ_COMMIT:
1186 case OBJ_TREE:
1187 case OBJ_BLOB:
1188 case OBJ_TAG:
1189 strcpy(type, type_names[kind]);
1190 *store_size = 0; /* notyet */
03e79c88 1191 unuse_pack(&w_curs);
43057304 1192 return;
eb32d236 1193 case OBJ_OFS_DELTA:
03e79c88
SP
1194 get_delta_base(p, &w_curs, offset, kind,
1195 obj_offset, &offset);
eb32d236
NP
1196 if (*delta_chain_length == 0) {
1197 /* TODO: find base_sha1 as pointed by offset */
1198 }
1199 break;
1200 case OBJ_REF_DELTA:
03e79c88 1201 next_sha1 = use_pack(p, &w_curs, offset, NULL);
43057304
NP
1202 if (*delta_chain_length == 0)
1203 hashcpy(base_sha1, next_sha1);
1204 offset = find_pack_entry_one(next_sha1, p);
1205 break;
1206 }
eb32d236 1207 obj_offset = offset;
03e79c88 1208 offset = unpack_object_header(p, &w_curs, offset, &kind, &val);
43057304 1209 (*delta_chain_length)++;
ad8c80a5 1210 }
ad8c80a5
JH
1211}
1212
43057304 1213static int packed_object_info(struct packed_git *p, unsigned long offset,
1f688557
JH
1214 char *type, unsigned long *sizep)
1215{
03e79c88 1216 struct pack_window *w_curs = NULL;
eb32d236 1217 unsigned long size, obj_offset = offset;
a733cb60 1218 enum object_type kind;
03e79c88 1219 int r;
5db47c2b 1220
03e79c88 1221 offset = unpack_object_header(p, &w_curs, offset, &kind, &size);
5db47c2b 1222
a733cb60 1223 switch (kind) {
eb32d236
NP
1224 case OBJ_OFS_DELTA:
1225 case OBJ_REF_DELTA:
03e79c88
SP
1226 r = packed_delta_info(p, &w_curs, offset, kind,
1227 obj_offset, type, sizep);
1228 unuse_pack(&w_curs);
1229 return r;
a733cb60 1230 case OBJ_COMMIT:
a733cb60 1231 case OBJ_TREE:
a733cb60 1232 case OBJ_BLOB:
a733cb60 1233 case OBJ_TAG:
5a18f540 1234 strcpy(type, type_names[kind]);
03e79c88 1235 unuse_pack(&w_curs);
a69d0943 1236 break;
1f688557 1237 default:
08a19d87 1238 die("pack %s contains unknown object type %d",
264b16b6 1239 p->pack_name, kind);
1f688557 1240 }
c62266f3
JH
1241 if (sizep)
1242 *sizep = size;
1f688557
JH
1243 return 0;
1244}
1245
eb950c19 1246static void *unpack_compressed_entry(struct packed_git *p,
03e79c88 1247 struct pack_window **w_curs,
eb950c19
SP
1248 unsigned long offset,
1249 unsigned long size)
de530aaa
SP
1250{
1251 int st;
1252 z_stream stream;
079afb18 1253 unsigned char *buffer, *in;
de530aaa
SP
1254
1255 buffer = xmalloc(size + 1);
1256 buffer[size] = 0;
1257 memset(&stream, 0, sizeof(stream));
de530aaa
SP
1258 stream.next_out = buffer;
1259 stream.avail_out = size;
1260
1261 inflateInit(&stream);
079afb18
SP
1262 do {
1263 in = use_pack(p, w_curs, offset, &stream.avail_in);
1264 stream.next_in = in;
1265 st = inflate(&stream, Z_FINISH);
1266 offset += stream.next_in - in;
1267 } while (st == Z_OK || st == Z_BUF_ERROR);
de530aaa
SP
1268 inflateEnd(&stream);
1269 if ((st != Z_STREAM_END) || stream.total_out != size) {
1270 free(buffer);
1271 return NULL;
1272 }
1273
1274 return buffer;
1275}
1276
eb950c19 1277static void *unpack_delta_entry(struct packed_git *p,
03e79c88 1278 struct pack_window **w_curs,
eb950c19 1279 unsigned long offset,
1f688557 1280 unsigned long delta_size,
eb32d236
NP
1281 enum object_type kind,
1282 unsigned long obj_offset,
1f688557 1283 char *type,
eb950c19 1284 unsigned long *sizep)
1f688557 1285{
7c3e8be3 1286 void *delta_data, *result, *base;
43057304 1287 unsigned long result_size, base_size, base_offset;
43057304 1288
03e79c88
SP
1289 offset = get_delta_base(p, w_curs, offset, kind,
1290 obj_offset, &base_offset);
4d703a1a 1291 base = unpack_entry(p, base_offset, type, &base_size);
67686d95 1292 if (!base)
43057304
NP
1293 die("failed to read delta base object at %lu from %s",
1294 base_offset, p->pack_name);
67686d95 1295
03e79c88 1296 delta_data = unpack_compressed_entry(p, w_curs, offset, delta_size);
1f688557
JH
1297 result = patch_delta(base, base_size,
1298 delta_data, delta_size,
1299 &result_size);
1300 if (!result)
1301 die("failed to apply delta");
1302 free(delta_data);
1303 free(base);
1304 *sizep = result_size;
1305 return result;
1306}
1307
4d703a1a 1308void *unpack_entry(struct packed_git *p, unsigned long offset,
1f688557
JH
1309 char *type, unsigned long *sizep)
1310{
03e79c88 1311 struct pack_window *w_curs = NULL;
4d703a1a
SP
1312 unsigned long size, obj_offset = offset;
1313 enum object_type kind;
f9253394 1314 void *retval;
1f688557 1315
03e79c88 1316 offset = unpack_object_header(p, &w_curs, offset, &kind, &size);
a733cb60 1317 switch (kind) {
eb32d236
NP
1318 case OBJ_OFS_DELTA:
1319 case OBJ_REF_DELTA:
03e79c88
SP
1320 retval = unpack_delta_entry(p, &w_curs, offset, size,
1321 kind, obj_offset, type, sizep);
4d703a1a 1322 break;
a733cb60 1323 case OBJ_COMMIT:
a733cb60 1324 case OBJ_TREE:
a733cb60 1325 case OBJ_BLOB:
a733cb60 1326 case OBJ_TAG:
5a18f540
SP
1327 strcpy(type, type_names[kind]);
1328 *sizep = size;
03e79c88 1329 retval = unpack_compressed_entry(p, &w_curs, offset, size);
4d703a1a 1330 break;
1f688557 1331 default:
4d703a1a 1332 die("unknown object type %i in %s", kind, p->pack_name);
1f688557 1333 }
03e79c88 1334 unuse_pack(&w_curs);
4d703a1a 1335 return retval;
1f688557
JH
1336}
1337
9a217f2a
JH
1338int num_packed_objects(const struct packed_git *p)
1339{
f9253394 1340 /* See check_packed_git_idx() */
9a217f2a
JH
1341 return (p->index_size - 20 - 20 - 4*256) / 24;
1342}
1343
1344int nth_packed_object_sha1(const struct packed_git *p, int n,
1345 unsigned char* sha1)
1346{
1347 void *index = p->index_base + 256;
1348 if (n < 0 || num_packed_objects(p) <= n)
1349 return -1;
e702496e 1350 hashcpy(sha1, (unsigned char *) index + (24 * n) + 4);
9a217f2a
JH
1351 return 0;
1352}
1353
43057304
NP
1354unsigned long find_pack_entry_one(const unsigned char *sha1,
1355 struct packed_git *p)
1f688557 1356{
b18b00a6 1357 uint32_t *level1_ofs = p->index_base;
1f688557
JH
1358 int hi = ntohl(level1_ofs[*sha1]);
1359 int lo = ((*sha1 == 0x0) ? 0 : ntohl(level1_ofs[*sha1 - 1]));
1360 void *index = p->index_base + 256;
1361
1362 do {
1363 int mi = (lo + hi) / 2;
a89fccd2 1364 int cmp = hashcmp((unsigned char *)index + (24 * mi) + 4, sha1);
43057304 1365 if (!cmp)
b18b00a6 1366 return ntohl(*((uint32_t *)((char *)index + (24 * mi))));
1f688557
JH
1367 if (cmp > 0)
1368 hi = mi;
1369 else
1370 lo = mi+1;
1371 } while (lo < hi);
1372 return 0;
1373}
1374
d4ff6d92
SP
1375static int matches_pack_name(struct packed_git *p, const char *ig)
1376{
1377 const char *last_c, *c;
1378
1379 if (!strcmp(p->pack_name, ig))
1380 return 0;
1381
1382 for (c = p->pack_name, last_c = c; *c;)
1383 if (*c == '/')
1384 last_c = ++c;
1385 else
1386 ++c;
1387 if (!strcmp(last_c, ig))
1388 return 0;
1389
1390 return 1;
1391}
1392
106d710b 1393static int find_pack_entry(const unsigned char *sha1, struct pack_entry *e, const char **ignore_packed)
1f688557
JH
1394{
1395 struct packed_git *p;
43057304
NP
1396 unsigned long offset;
1397
1f688557
JH
1398 prepare_packed_git();
1399
1400 for (p = packed_git; p; p = p->next) {
106d710b
JH
1401 if (ignore_packed) {
1402 const char **ig;
1403 for (ig = ignore_packed; *ig; ig++)
d4ff6d92 1404 if (!matches_pack_name(p, *ig))
106d710b
JH
1405 break;
1406 if (*ig)
1407 continue;
1408 }
43057304
NP
1409 offset = find_pack_entry_one(sha1, p);
1410 if (offset) {
1411 e->offset = offset;
1412 e->p = p;
1413 hashcpy(e->sha1, sha1);
1f688557 1414 return 1;
43057304 1415 }
1f688557
JH
1416 }
1417 return 0;
1418}
1419
bf592c50
DB
1420struct packed_git *find_sha1_pack(const unsigned char *sha1,
1421 struct packed_git *packs)
1422{
1423 struct packed_git *p;
bf592c50
DB
1424
1425 for (p = packs; p; p = p->next) {
43057304 1426 if (find_pack_entry_one(sha1, p))
bf592c50
DB
1427 return p;
1428 }
1429 return NULL;
1430
1431}
1432
f0df4ed5 1433static int sha1_loose_object_info(const unsigned char *sha1, char *type, unsigned long *sizep)
65c2e0c3 1434{
36e4d74a 1435 int status;
65c2e0c3
JH
1436 unsigned long mapsize, size;
1437 void *map;
1438 z_stream stream;
36e4d74a 1439 char hdr[128];
65c2e0c3 1440
bb6b8e4f 1441 map = map_sha1_file(sha1, &mapsize);
f0df4ed5
JS
1442 if (!map)
1443 return error("unable to find %s", sha1_to_hex(sha1));
36e4d74a
JH
1444 if (unpack_sha1_header(&stream, map, mapsize, hdr, sizeof(hdr)) < 0)
1445 status = error("unable to unpack %s header",
1446 sha1_to_hex(sha1));
1447 if (parse_sha1_header(hdr, type, &size) < 0)
1448 status = error("unable to parse %s header", sha1_to_hex(sha1));
c4584ae3 1449 else {
65c2e0c3 1450 status = 0;
c62266f3
JH
1451 if (sizep)
1452 *sizep = size;
65c2e0c3 1453 }
65c2e0c3
JH
1454 inflateEnd(&stream);
1455 munmap(map, mapsize);
1456 return status;
1457}
1458
f0df4ed5
JS
1459int sha1_object_info(const unsigned char *sha1, char *type, unsigned long *sizep)
1460{
f0df4ed5
JS
1461 struct pack_entry e;
1462
1463 if (!find_pack_entry(sha1, &e, NULL)) {
1464 reprepare_packed_git();
1465 if (!find_pack_entry(sha1, &e, NULL))
1466 return sha1_loose_object_info(sha1, type, sizep);
1467 }
03e79c88 1468 return packed_object_info(e.p, e.offset, type, sizep);
f0df4ed5
JS
1469}
1470
1f688557
JH
1471static void *read_packed_sha1(const unsigned char *sha1, char *type, unsigned long *size)
1472{
1473 struct pack_entry e;
1474
8276c007 1475 if (!find_pack_entry(sha1, &e, NULL))
1f688557 1476 return NULL;
8276c007
PE
1477 else
1478 return unpack_entry(e.p, e.offset, type, size);
1f688557
JH
1479}
1480
0fcfd160
LT
1481void * read_sha1_file(const unsigned char *sha1, char *type, unsigned long *size)
1482{
1483 unsigned long mapsize;
1484 void *map, *buf;
1485
8276c007
PE
1486 buf = read_packed_sha1(sha1, type, size);
1487 if (buf)
1488 return buf;
bb6b8e4f 1489 map = map_sha1_file(sha1, &mapsize);
0fcfd160
LT
1490 if (map) {
1491 buf = unpack_sha1_file(map, mapsize, type, size);
1492 munmap(map, mapsize);
1493 return buf;
1494 }
637cdd9d 1495 reprepare_packed_git();
8276c007 1496 return read_packed_sha1(sha1, type, size);
0fcfd160
LT
1497}
1498
40469ee9 1499void *read_object_with_reference(const unsigned char *sha1,
bf0f910d 1500 const char *required_type,
40469ee9
JH
1501 unsigned long *size,
1502 unsigned char *actual_sha1_return)
f4913f91
JH
1503{
1504 char type[20];
1505 void *buffer;
1506 unsigned long isize;
40469ee9 1507 unsigned char actual_sha1[20];
f4913f91 1508
e702496e 1509 hashcpy(actual_sha1, sha1);
40469ee9
JH
1510 while (1) {
1511 int ref_length = -1;
1512 const char *ref_type = NULL;
f4913f91 1513
40469ee9
JH
1514 buffer = read_sha1_file(actual_sha1, type, &isize);
1515 if (!buffer)
1516 return NULL;
1517 if (!strcmp(type, required_type)) {
1518 *size = isize;
1519 if (actual_sha1_return)
e702496e 1520 hashcpy(actual_sha1_return, actual_sha1);
40469ee9
JH
1521 return buffer;
1522 }
1523 /* Handle references */
8e440259 1524 else if (!strcmp(type, commit_type))
40469ee9 1525 ref_type = "tree ";
8e440259 1526 else if (!strcmp(type, tag_type))
40469ee9
JH
1527 ref_type = "object ";
1528 else {
1529 free(buffer);
1530 return NULL;
1531 }
1532 ref_length = strlen(ref_type);
f4913f91 1533
40469ee9 1534 if (memcmp(buffer, ref_type, ref_length) ||
1d7f171c 1535 get_sha1_hex((char *) buffer + ref_length, actual_sha1)) {
40469ee9
JH
1536 free(buffer);
1537 return NULL;
1538 }
1cf58e72 1539 free(buffer);
40469ee9
JH
1540 /* Now we have the ID of the referred-to object in
1541 * actual_sha1. Check again. */
f4913f91 1542 }
f4913f91
JH
1543}
1544
972a9155
RS
1545static void write_sha1_file_prepare(void *buf, unsigned long len,
1546 const char *type, unsigned char *sha1,
1547 unsigned char *hdr, int *hdrlen)
d410c0f5
JH
1548{
1549 SHA_CTX c;
1550
1551 /* Generate the header */
1552 *hdrlen = sprintf((char *)hdr, "%s %lu", type, len)+1;
1553
1554 /* Sha1.. */
1555 SHA1_Init(&c);
1556 SHA1_Update(&c, hdr, *hdrlen);
1557 SHA1_Update(&c, buf, len);
1558 SHA1_Final(sha1, &c);
d410c0f5
JH
1559}
1560
230f1322
LT
1561/*
1562 * Link the tempfile to the final place, possibly creating the
1563 * last directory level as you do so.
1564 *
1565 * Returns the errno on failure, 0 on success.
1566 */
839837b9 1567static int link_temp_to_file(const char *tmpfile, const char *filename)
230f1322
LT
1568{
1569 int ret;
756aaf4a 1570 char *dir;
230f1322
LT
1571
1572 if (!link(tmpfile, filename))
1573 return 0;
1574
1575 /*
756aaf4a 1576 * Try to mkdir the last path component if that failed.
230f1322
LT
1577 *
1578 * Re-try the "link()" regardless of whether the mkdir
1579 * succeeds, since a race might mean that somebody
1580 * else succeeded.
1581 */
1582 ret = errno;
756aaf4a
SP
1583 dir = strrchr(filename, '/');
1584 if (dir) {
1585 *dir = 0;
866cae0d 1586 if (!mkdir(filename, 0777) && adjust_shared_perm(filename)) {
91c23e48 1587 *dir = '/';
756aaf4a 1588 return -2;
91c23e48 1589 }
756aaf4a
SP
1590 *dir = '/';
1591 if (!link(tmpfile, filename))
1592 return 0;
1593 ret = errno;
230f1322
LT
1594 }
1595 return ret;
1596}
1597
1598/*
1599 * Move the just written object into its final resting place
1600 */
839837b9 1601int move_temp_to_file(const char *tmpfile, const char *filename)
230f1322
LT
1602{
1603 int ret = link_temp_to_file(tmpfile, filename);
7ebb6fca
LT
1604
1605 /*
1606 * Coda hack - coda doesn't like cross-directory links,
1607 * so we fall back to a rename, which will mean that it
1608 * won't be able to check collisions, but that's not a
1609 * big deal.
1610 *
1611 * The same holds for FAT formatted media.
1612 *
1613 * When this succeeds, we just return 0. We have nothing
1614 * left to unlink.
1615 */
1616 if (ret && ret != EEXIST) {
1617 if (!rename(tmpfile, filename))
230f1322 1618 return 0;
9e48b389 1619 ret = errno;
230f1322
LT
1620 }
1621 unlink(tmpfile);
1622 if (ret) {
1623 if (ret != EEXIST) {
916d081b 1624 return error("unable to write sha1 filename %s: %s\n", filename, strerror(ret));
230f1322
LT
1625 }
1626 /* FIXME!!! Collision check here ? */
1627 }
1628
1629 return 0;
1630}
1631
4d548150
LT
1632static int write_buffer(int fd, const void *buf, size_t len)
1633{
d34cf19b 1634 if (write_in_full(fd, buf, len) < 0)
93822c22 1635 return error("file write error (%s)", strerror(errno));
4d548150
LT
1636 return 0;
1637}
1638
93821bd9
LT
1639static int write_binary_header(unsigned char *hdr, enum object_type type, unsigned long len)
1640{
1641 int hdr_len;
1642 unsigned char c;
1643
1644 c = (type << 4) | (len & 15);
1645 len >>= 4;
1646 hdr_len = 1;
1647 while (len) {
1648 *hdr++ = c | 0x80;
1649 hdr_len++;
1650 c = (len & 0x7f);
1651 len >>= 7;
1652 }
1653 *hdr = c;
1654 return hdr_len;
1655}
1656
1657static void setup_object_header(z_stream *stream, const char *type, unsigned long len)
1658{
1659 int obj_type, hdr;
1660
1661 if (use_legacy_headers) {
1662 while (deflate(stream, 0) == Z_OK)
1663 /* nothing */;
1664 return;
1665 }
1666 if (!strcmp(type, blob_type))
1667 obj_type = OBJ_BLOB;
1668 else if (!strcmp(type, tree_type))
1669 obj_type = OBJ_TREE;
1670 else if (!strcmp(type, commit_type))
1671 obj_type = OBJ_COMMIT;
1672 else if (!strcmp(type, tag_type))
1673 obj_type = OBJ_TAG;
1674 else
1675 die("trying to generate bogus object of type '%s'", type);
1676 hdr = write_binary_header(stream->next_out, obj_type, len);
1677 stream->total_out = hdr;
1678 stream->next_out += hdr;
1679 stream->avail_out -= hdr;
1680}
1681
abdc3fc8
RS
1682int hash_sha1_file(void *buf, unsigned long len, const char *type,
1683 unsigned char *sha1)
1684{
1685 unsigned char hdr[50];
1686 int hdrlen;
1687 write_sha1_file_prepare(buf, len, type, sha1, hdr, &hdrlen);
1688 return 0;
1689}
1690
bf0f910d 1691int write_sha1_file(void *buf, unsigned long len, const char *type, unsigned char *returnsha1)
0fcfd160
LT
1692{
1693 int size;
bf0f910d 1694 unsigned char *compressed;
0fcfd160
LT
1695 z_stream stream;
1696 unsigned char sha1[20];
706bc531 1697 char *filename;
aac17941 1698 static char tmpfile[PATH_MAX];
bf0f910d 1699 unsigned char hdr[50];
230f1322 1700 int fd, hdrlen;
a44c9a5e 1701
d410c0f5
JH
1702 /* Normally if we have it in the pack then we do not bother writing
1703 * it out into .git/objects/??/?{38} file.
1704 */
972a9155
RS
1705 write_sha1_file_prepare(buf, len, type, sha1, hdr, &hdrlen);
1706 filename = sha1_file_name(sha1);
706bc531 1707 if (returnsha1)
e702496e 1708 hashcpy(returnsha1, sha1);
d410c0f5
JH
1709 if (has_sha1_file(sha1))
1710 return 0;
aac17941
LT
1711 fd = open(filename, O_RDONLY);
1712 if (fd >= 0) {
706bc531 1713 /*
aac17941
LT
1714 * FIXME!!! We might do collision checking here, but we'd
1715 * need to uncompress the old file and check it. Later.
706bc531 1716 */
aac17941 1717 close(fd);
706bc531
LT
1718 return 0;
1719 }
1720
aac17941 1721 if (errno != ENOENT) {
916d081b 1722 return error("sha1 file %s: %s\n", filename, strerror(errno));
aac17941
LT
1723 }
1724
1725 snprintf(tmpfile, sizeof(tmpfile), "%s/obj_XXXXXX", get_object_directory());
ace1534d 1726
aac17941
LT
1727 fd = mkstemp(tmpfile);
1728 if (fd < 0) {
916d081b
PB
1729 if (errno == EPERM)
1730 return error("insufficient permission for adding an object to repository database %s\n", get_object_directory());
1731 else
1732 return error("unable to create temporary sha1 filename %s: %s\n", tmpfile, strerror(errno));
aac17941
LT
1733 }
1734
0fcfd160
LT
1735 /* Set it up */
1736 memset(&stream, 0, sizeof(stream));
12f6c308 1737 deflateInit(&stream, zlib_compression_level);
93821bd9 1738 size = 8 + deflateBound(&stream, len+hdrlen);
812666c8 1739 compressed = xmalloc(size);
0fcfd160
LT
1740
1741 /* Compress it */
0fcfd160
LT
1742 stream.next_out = compressed;
1743 stream.avail_out = size;
a44c9a5e
LT
1744
1745 /* First header.. */
1746 stream.next_in = hdr;
1747 stream.avail_in = hdrlen;
93821bd9 1748 setup_object_header(&stream, type, len);
a44c9a5e
LT
1749
1750 /* Then the data itself.. */
1751 stream.next_in = buf;
1752 stream.avail_in = len;
0fcfd160
LT
1753 while (deflate(&stream, Z_FINISH) == Z_OK)
1754 /* nothing */;
1755 deflateEnd(&stream);
1756 size = stream.total_out;
1757
4d548150
LT
1758 if (write_buffer(fd, compressed, size) < 0)
1759 die("unable to write sha1 file");
aac17941 1760 fchmod(fd, 0444);
706bc531 1761 close(fd);
383f85b7 1762 free(compressed);
0fcfd160 1763
230f1322 1764 return move_temp_to_file(tmpfile, filename);
0fcfd160 1765}
8237b185 1766
4d548150
LT
1767/*
1768 * We need to unpack and recompress the object for writing
1769 * it out to a different file.
1770 */
1771static void *repack_object(const unsigned char *sha1, unsigned long *objsize)
a5eda52b 1772{
4d548150 1773 size_t size;
a5eda52b 1774 z_stream stream;
4d548150
LT
1775 unsigned char *unpacked;
1776 unsigned long len;
1777 char type[20];
1778 char hdr[50];
1779 int hdrlen;
1780 void *buf;
bfc66daf 1781
a9486b02 1782 /* need to unpack and recompress it by itself */
4d548150 1783 unpacked = read_packed_sha1(sha1, type, &len);
8276c007
PE
1784 if (!unpacked)
1785 error("cannot read sha1_file for %s", sha1_to_hex(sha1));
a5eda52b 1786
4d548150 1787 hdrlen = sprintf(hdr, "%s %lu", type, len) + 1;
a5eda52b 1788
4d548150
LT
1789 /* Set it up */
1790 memset(&stream, 0, sizeof(stream));
12f6c308 1791 deflateInit(&stream, zlib_compression_level);
4d548150
LT
1792 size = deflateBound(&stream, len + hdrlen);
1793 buf = xmalloc(size);
a5eda52b 1794
4d548150
LT
1795 /* Compress it */
1796 stream.next_out = buf;
1797 stream.avail_out = size;
a5eda52b 1798
4d548150
LT
1799 /* First header.. */
1800 stream.next_in = (void *)hdr;
1801 stream.avail_in = hdrlen;
1802 while (deflate(&stream, 0) == Z_OK)
1803 /* nothing */;
bfc66daf 1804
4d548150
LT
1805 /* Then the data itself.. */
1806 stream.next_in = unpacked;
1807 stream.avail_in = len;
1808 while (deflate(&stream, Z_FINISH) == Z_OK)
1809 /* nothing */;
1810 deflateEnd(&stream);
1811 free(unpacked);
bfc66daf 1812
4d548150
LT
1813 *objsize = stream.total_out;
1814 return buf;
1815}
1816
1817int write_sha1_to_fd(int fd, const unsigned char *sha1)
1818{
1819 int retval;
1820 unsigned long objsize;
bb6b8e4f 1821 void *buf = map_sha1_file(sha1, &objsize);
4d548150
LT
1822
1823 if (buf) {
1824 retval = write_buffer(fd, buf, objsize);
1825 munmap(buf, objsize);
1826 return retval;
1827 }
1828
1829 buf = repack_object(sha1, &objsize);
1830 retval = write_buffer(fd, buf, objsize);
1831 free(buf);
1832 return retval;
a5eda52b
DB
1833}
1834
70b9829e
DB
1835int write_sha1_from_fd(const unsigned char *sha1, int fd, char *buffer,
1836 size_t bufsize, size_t *bufposn)
8237b185 1837{
230f1322 1838 char tmpfile[PATH_MAX];
8237b185
DB
1839 int local;
1840 z_stream stream;
1841 unsigned char real_sha1[20];
bf0f910d 1842 unsigned char discard[4096];
8237b185
DB
1843 int ret;
1844 SHA_CTX c;
1845
230f1322 1846 snprintf(tmpfile, sizeof(tmpfile), "%s/obj_XXXXXX", get_object_directory());
8237b185 1847
230f1322 1848 local = mkstemp(tmpfile);
916d081b
PB
1849 if (local < 0) {
1850 if (errno == EPERM)
1851 return error("insufficient permission for adding an object to repository database %s\n", get_object_directory());
1852 else
1853 return error("unable to create temporary sha1 filename %s: %s\n", tmpfile, strerror(errno));
1854 }
8237b185
DB
1855
1856 memset(&stream, 0, sizeof(stream));
1857
1858 inflateInit(&stream);
1859
1860 SHA1_Init(&c);
1861
1862 do {
1863 ssize_t size;
70b9829e
DB
1864 if (*bufposn) {
1865 stream.avail_in = *bufposn;
96ad15ae 1866 stream.next_in = (unsigned char *) buffer;
70b9829e
DB
1867 do {
1868 stream.next_out = discard;
1869 stream.avail_out = sizeof(discard);
1870 ret = inflate(&stream, Z_SYNC_FLUSH);
1871 SHA1_Update(&c, discard, sizeof(discard) -
1872 stream.avail_out);
1873 } while (stream.avail_in && ret == Z_OK);
4d548150
LT
1874 if (write_buffer(local, buffer, *bufposn - stream.avail_in) < 0)
1875 die("unable to write sha1 file");
70b9829e
DB
1876 memmove(buffer, buffer + *bufposn - stream.avail_in,
1877 stream.avail_in);
1878 *bufposn = stream.avail_in;
1879 if (ret != Z_OK)
1880 break;
1881 }
93d26e4c 1882 size = xread(fd, buffer + *bufposn, bufsize - *bufposn);
8237b185
DB
1883 if (size <= 0) {
1884 close(local);
230f1322 1885 unlink(tmpfile);
8237b185
DB
1886 if (!size)
1887 return error("Connection closed?");
1888 perror("Reading from connection");
1889 return -1;
1890 }
70b9829e
DB
1891 *bufposn += size;
1892 } while (1);
8237b185
DB
1893 inflateEnd(&stream);
1894
1895 close(local);
1896 SHA1_Final(real_sha1, &c);
1897 if (ret != Z_STREAM_END) {
230f1322 1898 unlink(tmpfile);
8237b185
DB
1899 return error("File %s corrupted", sha1_to_hex(sha1));
1900 }
a89fccd2 1901 if (hashcmp(sha1, real_sha1)) {
230f1322 1902 unlink(tmpfile);
bd2afde8 1903 return error("File %s has bad hash", sha1_to_hex(sha1));
8237b185 1904 }
230f1322
LT
1905
1906 return move_temp_to_file(tmpfile, sha1_file_name(sha1));
8237b185
DB
1907}
1908
bf592c50
DB
1909int has_pack_index(const unsigned char *sha1)
1910{
1911 struct stat st;
1912 if (stat(sha1_pack_index_name(sha1), &st))
1913 return 0;
1914 return 1;
1915}
1916
1917int has_pack_file(const unsigned char *sha1)
1918{
1919 struct stat st;
1920 if (stat(sha1_pack_name(sha1), &st))
1921 return 0;
1922 return 1;
1923}
1924
106d710b 1925int has_sha1_pack(const unsigned char *sha1, const char **ignore_packed)
dade09c2
LT
1926{
1927 struct pack_entry e;
106d710b 1928 return find_pack_entry(sha1, &e, ignore_packed);
dade09c2
LT
1929}
1930
8237b185
DB
1931int has_sha1_file(const unsigned char *sha1)
1932{
8237b185 1933 struct stat st;
1f688557
JH
1934 struct pack_entry e;
1935
106d710b 1936 if (find_pack_entry(sha1, &e, NULL))
1f688557 1937 return 1;
ab90ea5d 1938 return find_sha1_file(sha1, &st) ? 1 : 0;
8237b185 1939}
74400e71 1940
e7332f96
BE
1941/*
1942 * reads from fd as long as possible into a supplied buffer of size bytes.
82e5a82f 1943 * If necessary the buffer's size is increased using realloc()
e7332f96
BE
1944 *
1945 * returns 0 if anything went fine and -1 otherwise
1946 *
1947 * NOTE: both buf and size may change, but even when -1 is returned
1948 * you still have to free() it yourself.
1949 */
1950int read_pipe(int fd, char** return_buf, unsigned long* return_size)
024510c8 1951{
e7332f96
BE
1952 char* buf = *return_buf;
1953 unsigned long size = *return_size;
1954 int iret;
024510c8 1955 unsigned long off = 0;
e7332f96 1956
024510c8 1957 do {
e7332f96 1958 iret = xread(fd, buf + off, size - off);
024510c8
DB
1959 if (iret > 0) {
1960 off += iret;
1961 if (off == size) {
1962 size *= 2;
83572c1a 1963 buf = xrealloc(buf, size);
024510c8
DB
1964 }
1965 }
1966 } while (iret > 0);
e7332f96
BE
1967
1968 *return_buf = buf;
1969 *return_size = off;
1970
1971 if (iret < 0)
1972 return -1;
1973 return 0;
1974}
1975
1976int index_pipe(unsigned char *sha1, int fd, const char *type, int write_object)
1977{
1978 unsigned long size = 4096;
2d7320d0 1979 char *buf = xmalloc(size);
e7332f96 1980 int ret;
e7332f96
BE
1981
1982 if (read_pipe(fd, &buf, &size)) {
024510c8
DB
1983 free(buf);
1984 return -1;
1985 }
e7332f96 1986
024510c8 1987 if (!type)
8e440259 1988 type = blob_type;
024510c8 1989 if (write_object)
e7332f96 1990 ret = write_sha1_file(buf, size, type, sha1);
abdc3fc8
RS
1991 else
1992 ret = hash_sha1_file(buf, size, type, sha1);
024510c8
DB
1993 free(buf);
1994 return ret;
1995}
1996
7672db20 1997int index_fd(unsigned char *sha1, int fd, struct stat *st, int write_object, const char *type)
74400e71 1998{
74400e71 1999 unsigned long size = st->st_size;
aac17941
LT
2000 void *buf;
2001 int ret;
74400e71 2002
aac17941 2003 buf = "";
74400e71 2004 if (size)
c4712e45 2005 buf = xmmap(NULL, size, PROT_READ, MAP_PRIVATE, fd, 0);
74400e71 2006 close(fd);
74400e71 2007
7672db20 2008 if (!type)
8e440259 2009 type = blob_type;
7672db20
BL
2010 if (write_object)
2011 ret = write_sha1_file(buf, size, type, sha1);
abdc3fc8
RS
2012 else
2013 ret = hash_sha1_file(buf, size, type, sha1);
aac17941
LT
2014 if (size)
2015 munmap(buf, size);
2016 return ret;
74400e71 2017}
ec1fcc16
JH
2018
2019int index_path(unsigned char *sha1, const char *path, struct stat *st, int write_object)
2020{
2021 int fd;
2022 char *target;
2023
2024 switch (st->st_mode & S_IFMT) {
2025 case S_IFREG:
2026 fd = open(path, O_RDONLY);
2027 if (fd < 0)
2028 return error("open(\"%s\"): %s", path,
2029 strerror(errno));
2030 if (index_fd(sha1, fd, st, write_object, NULL) < 0)
2031 return error("%s: failed to insert into database",
2032 path);
2033 break;
2034 case S_IFLNK:
2035 target = xmalloc(st->st_size+1);
2036 if (readlink(path, target, st->st_size+1) != st->st_size) {
2037 char *errstr = strerror(errno);
2038 free(target);
2039 return error("readlink(\"%s\"): %s", path,
2040 errstr);
2041 }
abdc3fc8
RS
2042 if (!write_object)
2043 hash_sha1_file(target, st->st_size, blob_type, sha1);
2044 else if (write_sha1_file(target, st->st_size, blob_type, sha1))
ec1fcc16
JH
2045 return error("%s: failed to insert into database",
2046 path);
2047 free(target);
2048 break;
2049 default:
2050 return error("%s: unsupported file type", path);
2051 }
2052 return 0;
2053}
a69e5429
JH
2054
2055int read_pack_header(int fd, struct pack_header *header)
2056{
2057 char *c = (char*)header;
2058 ssize_t remaining = sizeof(struct pack_header);
2059 do {
2060 ssize_t r = xread(fd, c, remaining);
2061 if (r <= 0)
2062 /* "eof before pack header was fully read" */
2063 return PH_ERROR_EOF;
2064 remaining -= r;
2065 c += r;
2066 } while (remaining > 0);
2067 if (header->hdr_signature != htonl(PACK_SIGNATURE))
2068 /* "protocol error (pack signature mismatch detected)" */
2069 return PH_ERROR_PACK_SIGNATURE;
2070 if (!pack_version_ok(header->hdr_version))
2071 /* "protocol error (pack version unsupported)" */
2072 return PH_ERROR_PROTOCOL;
2073 return 0;
2074}