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