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Commit | Line | Data |
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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" | |
f35a6d3b | 16 | #include "refs.h" |
0fcfd160 | 17 | |
144bde78 LT |
18 | #ifndef O_NOATIME |
19 | #if defined(__linux__) && (defined(__i386__) || defined(__PPC__)) | |
20 | #define O_NOATIME 01000000 | |
21 | #else | |
22 | #define O_NOATIME 0 | |
23 | #endif | |
24 | #endif | |
25 | ||
e05db0fd PR |
26 | #ifdef NO_C99_FORMAT |
27 | #define SZ_FMT "lu" | |
28 | #else | |
29 | #define SZ_FMT "zu" | |
30 | #endif | |
31 | ||
96f1e58f | 32 | const unsigned char null_sha1[20]; |
88cd621d | 33 | |
144bde78 LT |
34 | static unsigned int sha1_file_open_flag = O_NOATIME; |
35 | ||
e49521b5 JH |
36 | signed char hexval_table[256] = { |
37 | -1, -1, -1, -1, -1, -1, -1, -1, /* 00-07 */ | |
38 | -1, -1, -1, -1, -1, -1, -1, -1, /* 08-0f */ | |
39 | -1, -1, -1, -1, -1, -1, -1, -1, /* 10-17 */ | |
40 | -1, -1, -1, -1, -1, -1, -1, -1, /* 18-1f */ | |
41 | -1, -1, -1, -1, -1, -1, -1, -1, /* 20-27 */ | |
42 | -1, -1, -1, -1, -1, -1, -1, -1, /* 28-2f */ | |
43 | 0, 1, 2, 3, 4, 5, 6, 7, /* 30-37 */ | |
44 | 8, 9, -1, -1, -1, -1, -1, -1, /* 38-3f */ | |
45 | -1, 10, 11, 12, 13, 14, 15, -1, /* 40-47 */ | |
46 | -1, -1, -1, -1, -1, -1, -1, -1, /* 48-4f */ | |
47 | -1, -1, -1, -1, -1, -1, -1, -1, /* 50-57 */ | |
48 | -1, -1, -1, -1, -1, -1, -1, -1, /* 58-5f */ | |
49 | -1, 10, 11, 12, 13, 14, 15, -1, /* 60-67 */ | |
50 | -1, -1, -1, -1, -1, -1, -1, -1, /* 68-67 */ | |
51 | -1, -1, -1, -1, -1, -1, -1, -1, /* 70-77 */ | |
52 | -1, -1, -1, -1, -1, -1, -1, -1, /* 78-7f */ | |
53 | -1, -1, -1, -1, -1, -1, -1, -1, /* 80-87 */ | |
54 | -1, -1, -1, -1, -1, -1, -1, -1, /* 88-8f */ | |
55 | -1, -1, -1, -1, -1, -1, -1, -1, /* 90-97 */ | |
56 | -1, -1, -1, -1, -1, -1, -1, -1, /* 98-9f */ | |
57 | -1, -1, -1, -1, -1, -1, -1, -1, /* a0-a7 */ | |
58 | -1, -1, -1, -1, -1, -1, -1, -1, /* a8-af */ | |
59 | -1, -1, -1, -1, -1, -1, -1, -1, /* b0-b7 */ | |
60 | -1, -1, -1, -1, -1, -1, -1, -1, /* b8-bf */ | |
61 | -1, -1, -1, -1, -1, -1, -1, -1, /* c0-c7 */ | |
62 | -1, -1, -1, -1, -1, -1, -1, -1, /* c8-cf */ | |
63 | -1, -1, -1, -1, -1, -1, -1, -1, /* d0-d7 */ | |
64 | -1, -1, -1, -1, -1, -1, -1, -1, /* d8-df */ | |
65 | -1, -1, -1, -1, -1, -1, -1, -1, /* e0-e7 */ | |
66 | -1, -1, -1, -1, -1, -1, -1, -1, /* e8-ef */ | |
67 | -1, -1, -1, -1, -1, -1, -1, -1, /* f0-f7 */ | |
68 | -1, -1, -1, -1, -1, -1, -1, -1, /* f8-ff */ | |
69 | }; | |
0fcfd160 LT |
70 | |
71 | int get_sha1_hex(const char *hex, unsigned char *sha1) | |
72 | { | |
73 | int i; | |
74 | for (i = 0; i < 20; i++) { | |
75 | unsigned int val = (hexval(hex[0]) << 4) | hexval(hex[1]); | |
76 | if (val & ~0xff) | |
77 | return -1; | |
78 | *sha1++ = val; | |
79 | hex += 2; | |
80 | } | |
81 | return 0; | |
82 | } | |
83 | ||
b2cb9425 JH |
84 | int safe_create_leading_directories(char *path) |
85 | { | |
86 | char *pos = path; | |
67d42212 JR |
87 | struct stat st; |
88 | ||
67ffdf4c JS |
89 | if (*pos == '/') |
90 | pos++; | |
b2cb9425 JH |
91 | |
92 | while (pos) { | |
93 | pos = strchr(pos, '/'); | |
94 | if (!pos) | |
95 | break; | |
96 | *pos = 0; | |
67d42212 JR |
97 | if (!stat(path, &st)) { |
98 | /* path exists */ | |
99 | if (!S_ISDIR(st.st_mode)) { | |
b2cb9425 | 100 | *pos = '/'; |
67d42212 | 101 | return -3; |
b2cb9425 | 102 | } |
457f06d6 | 103 | } |
67d42212 JR |
104 | else if (mkdir(path, 0777)) { |
105 | *pos = '/'; | |
106 | return -1; | |
107 | } | |
457f06d6 JS |
108 | else if (adjust_shared_perm(path)) { |
109 | *pos = '/'; | |
110 | return -2; | |
111 | } | |
b2cb9425 JH |
112 | *pos++ = '/'; |
113 | } | |
114 | return 0; | |
115 | } | |
723c31fe | 116 | |
0fcfd160 LT |
117 | char * sha1_to_hex(const unsigned char *sha1) |
118 | { | |
dcb3450f LT |
119 | static int bufno; |
120 | static char hexbuffer[4][50]; | |
0fcfd160 | 121 | static const char hex[] = "0123456789abcdef"; |
dcb3450f | 122 | char *buffer = hexbuffer[3 & ++bufno], *buf = buffer; |
0fcfd160 LT |
123 | int i; |
124 | ||
125 | for (i = 0; i < 20; i++) { | |
126 | unsigned int val = *sha1++; | |
127 | *buf++ = hex[val >> 4]; | |
128 | *buf++ = hex[val & 0xf]; | |
129 | } | |
1e80e044 JS |
130 | *buf = '\0'; |
131 | ||
0fcfd160 LT |
132 | return buffer; |
133 | } | |
134 | ||
ace1534d JH |
135 | static void fill_sha1_path(char *pathbuf, const unsigned char *sha1) |
136 | { | |
137 | int i; | |
138 | for (i = 0; i < 20; i++) { | |
139 | static char hex[] = "0123456789abcdef"; | |
140 | unsigned int val = sha1[i]; | |
141 | char *pos = pathbuf + i*2 + (i > 0); | |
142 | *pos++ = hex[val >> 4]; | |
143 | *pos = hex[val & 0xf]; | |
144 | } | |
145 | } | |
146 | ||
0fcfd160 LT |
147 | /* |
148 | * NOTE! This returns a statically allocated buffer, so you have to be | |
9befac47 | 149 | * careful about using it. Do a "xstrdup()" if you need to save the |
0fcfd160 | 150 | * filename. |
ace1534d JH |
151 | * |
152 | * Also note that this returns the location for creating. Reading | |
153 | * SHA1 file can happen from any alternate directory listed in the | |
d19938ab | 154 | * DB_ENVIRONMENT environment variable if it is not found in |
ace1534d | 155 | * the primary object database. |
0fcfd160 LT |
156 | */ |
157 | char *sha1_file_name(const unsigned char *sha1) | |
158 | { | |
0fcfd160 LT |
159 | static char *name, *base; |
160 | ||
161 | if (!base) { | |
d19938ab | 162 | const char *sha1_file_directory = get_object_directory(); |
0fcfd160 | 163 | int len = strlen(sha1_file_directory); |
812666c8 | 164 | base = xmalloc(len + 60); |
0fcfd160 LT |
165 | memcpy(base, sha1_file_directory, len); |
166 | memset(base+len, 0, 60); | |
167 | base[len] = '/'; | |
168 | base[len+3] = '/'; | |
169 | name = base + len + 1; | |
170 | } | |
ace1534d | 171 | fill_sha1_path(name, sha1); |
0fcfd160 LT |
172 | return base; |
173 | } | |
174 | ||
bf592c50 DB |
175 | char *sha1_pack_name(const unsigned char *sha1) |
176 | { | |
177 | static const char hex[] = "0123456789abcdef"; | |
178 | static char *name, *base, *buf; | |
179 | int i; | |
180 | ||
181 | if (!base) { | |
182 | const char *sha1_file_directory = get_object_directory(); | |
183 | int len = strlen(sha1_file_directory); | |
184 | base = xmalloc(len + 60); | |
185 | sprintf(base, "%s/pack/pack-1234567890123456789012345678901234567890.pack", sha1_file_directory); | |
186 | name = base + len + 11; | |
187 | } | |
188 | ||
189 | buf = name; | |
190 | ||
191 | for (i = 0; i < 20; i++) { | |
192 | unsigned int val = *sha1++; | |
193 | *buf++ = hex[val >> 4]; | |
194 | *buf++ = hex[val & 0xf]; | |
195 | } | |
196 | ||
197 | return base; | |
198 | } | |
199 | ||
200 | char *sha1_pack_index_name(const unsigned char *sha1) | |
201 | { | |
202 | static const char hex[] = "0123456789abcdef"; | |
203 | static char *name, *base, *buf; | |
204 | int i; | |
205 | ||
206 | if (!base) { | |
207 | const char *sha1_file_directory = get_object_directory(); | |
208 | int len = strlen(sha1_file_directory); | |
209 | base = xmalloc(len + 60); | |
210 | sprintf(base, "%s/pack/pack-1234567890123456789012345678901234567890.idx", sha1_file_directory); | |
211 | name = base + len + 11; | |
212 | } | |
213 | ||
214 | buf = name; | |
215 | ||
216 | for (i = 0; i < 20; i++) { | |
217 | unsigned int val = *sha1++; | |
218 | *buf++ = hex[val >> 4]; | |
219 | *buf++ = hex[val & 0xf]; | |
220 | } | |
221 | ||
222 | return base; | |
223 | } | |
224 | ||
d5a63b99 JH |
225 | struct alternate_object_database *alt_odb_list; |
226 | static struct alternate_object_database **alt_odb_tail; | |
ace1534d | 227 | |
c2f493a4 MW |
228 | static void read_info_alternates(const char * alternates, int depth); |
229 | ||
ddd5d056 JH |
230 | /* |
231 | * Prepare alternate object database registry. | |
d5a63b99 JH |
232 | * |
233 | * The variable alt_odb_list points at the list of struct | |
234 | * alternate_object_database. The elements on this list come from | |
235 | * non-empty elements from colon separated ALTERNATE_DB_ENVIRONMENT | |
236 | * environment variable, and $GIT_OBJECT_DIRECTORY/info/alternates, | |
1494e038 JH |
237 | * whose contents is similar to that environment variable but can be |
238 | * LF separated. Its base points at a statically allocated buffer that | |
d5a63b99 JH |
239 | * contains "/the/directory/corresponding/to/.git/objects/...", while |
240 | * its name points just after the slash at the end of ".git/objects/" | |
241 | * in the example above, and has enough space to hold 40-byte hex | |
242 | * SHA1, an extra slash for the first level indirection, and the | |
243 | * terminating NUL. | |
ddd5d056 | 244 | */ |
c2f493a4 | 245 | static int link_alt_odb_entry(const char * entry, int len, const char * relative_base, int depth) |
ace1534d | 246 | { |
c2f493a4 | 247 | struct stat st; |
1494e038 | 248 | const char *objdir = get_object_directory(); |
c2f493a4 MW |
249 | struct alternate_object_database *ent; |
250 | struct alternate_object_database *alt; | |
251 | /* 43 = 40-byte + 2 '/' + terminating NUL */ | |
252 | int pfxlen = len; | |
253 | int entlen = pfxlen + 43; | |
ccfd3e99 | 254 | int base_len = -1; |
d5a63b99 | 255 | |
c2f493a4 MW |
256 | if (*entry != '/' && relative_base) { |
257 | /* Relative alt-odb */ | |
258 | if (base_len < 0) | |
259 | base_len = strlen(relative_base) + 1; | |
260 | entlen += base_len; | |
261 | pfxlen += base_len; | |
262 | } | |
263 | ent = xmalloc(sizeof(*ent) + entlen); | |
264 | ||
265 | if (*entry != '/' && relative_base) { | |
266 | memcpy(ent->base, relative_base, base_len - 1); | |
267 | ent->base[base_len - 1] = '/'; | |
268 | memcpy(ent->base + base_len, entry, len); | |
269 | } | |
270 | else | |
271 | memcpy(ent->base, entry, pfxlen); | |
272 | ||
273 | ent->name = ent->base + pfxlen + 1; | |
274 | ent->base[pfxlen + 3] = '/'; | |
275 | ent->base[pfxlen] = ent->base[entlen-1] = 0; | |
276 | ||
277 | /* Detect cases where alternate disappeared */ | |
278 | if (stat(ent->base, &st) || !S_ISDIR(st.st_mode)) { | |
279 | error("object directory %s does not exist; " | |
280 | "check .git/objects/info/alternates.", | |
281 | ent->base); | |
282 | free(ent); | |
283 | return -1; | |
284 | } | |
285 | ||
286 | /* Prevent the common mistake of listing the same | |
287 | * thing twice, or object directory itself. | |
288 | */ | |
289 | for (alt = alt_odb_list; alt; alt = alt->next) { | |
290 | if (!memcmp(ent->base, alt->base, pfxlen)) { | |
291 | free(ent); | |
292 | return -1; | |
293 | } | |
294 | } | |
295 | if (!memcmp(ent->base, objdir, pfxlen)) { | |
296 | free(ent); | |
297 | return -1; | |
298 | } | |
299 | ||
300 | /* add the alternate entry */ | |
301 | *alt_odb_tail = ent; | |
302 | alt_odb_tail = &(ent->next); | |
303 | ent->next = NULL; | |
304 | ||
305 | /* recursively add alternates */ | |
306 | read_info_alternates(ent->base, depth + 1); | |
307 | ||
308 | ent->base[pfxlen] = '/'; | |
309 | ||
310 | return 0; | |
311 | } | |
312 | ||
313 | static void link_alt_odb_entries(const char *alt, const char *ep, int sep, | |
314 | const char *relative_base, int depth) | |
315 | { | |
316 | const char *cp, *last; | |
317 | ||
318 | if (depth > 5) { | |
319 | error("%s: ignoring alternate object stores, nesting too deep.", | |
320 | relative_base); | |
321 | return; | |
322 | } | |
323 | ||
d5a63b99 | 324 | last = alt; |
9577e7e3 JH |
325 | while (last < ep) { |
326 | cp = last; | |
327 | if (cp < ep && *cp == '#') { | |
328 | while (cp < ep && *cp != sep) | |
329 | cp++; | |
330 | last = cp + 1; | |
331 | continue; | |
332 | } | |
c2f493a4 MW |
333 | while (cp < ep && *cp != sep) |
334 | cp++; | |
d5a63b99 | 335 | if (last != cp) { |
c2f493a4 MW |
336 | if ((*last != '/') && depth) { |
337 | error("%s: ignoring relative alternate object store %s", | |
338 | relative_base, last); | |
339 | } else { | |
340 | link_alt_odb_entry(last, cp - last, | |
341 | relative_base, depth); | |
1494e038 | 342 | } |
d5a63b99 | 343 | } |
9577e7e3 | 344 | while (cp < ep && *cp == sep) |
d5a63b99 JH |
345 | cp++; |
346 | last = cp; | |
9577e7e3 | 347 | } |
d5a63b99 JH |
348 | } |
349 | ||
c2f493a4 | 350 | static void read_info_alternates(const char * relative_base, int depth) |
d5a63b99 | 351 | { |
9577e7e3 | 352 | char *map; |
dc49cd76 | 353 | size_t mapsz; |
d5a63b99 | 354 | struct stat st; |
c2f493a4 MW |
355 | char path[PATH_MAX]; |
356 | int fd; | |
d5a63b99 | 357 | |
c2f493a4 | 358 | sprintf(path, "%s/info/alternates", relative_base); |
d5a63b99 JH |
359 | fd = open(path, O_RDONLY); |
360 | if (fd < 0) | |
361 | return; | |
362 | if (fstat(fd, &st) || (st.st_size == 0)) { | |
363 | close(fd); | |
9a217f2a | 364 | return; |
ace1534d | 365 | } |
dc49cd76 SP |
366 | mapsz = xsize_t(st.st_size); |
367 | map = xmmap(NULL, mapsz, PROT_READ, MAP_PRIVATE, fd, 0); | |
d5a63b99 | 368 | close(fd); |
d5a63b99 | 369 | |
dc49cd76 | 370 | link_alt_odb_entries(map, map + mapsz, '\n', relative_base, depth); |
c2f493a4 | 371 | |
dc49cd76 | 372 | munmap(map, mapsz); |
ace1534d JH |
373 | } |
374 | ||
c2f493a4 MW |
375 | void prepare_alt_odb(void) |
376 | { | |
554fe20d | 377 | const char *alt; |
c2f493a4 MW |
378 | |
379 | alt = getenv(ALTERNATE_DB_ENVIRONMENT); | |
380 | if (!alt) alt = ""; | |
381 | ||
382 | if (alt_odb_tail) | |
383 | return; | |
384 | alt_odb_tail = &alt_odb_list; | |
385 | link_alt_odb_entries(alt, alt + strlen(alt), ':', NULL, 0); | |
386 | ||
387 | read_info_alternates(get_object_directory(), 0); | |
388 | } | |
389 | ||
ace1534d JH |
390 | static char *find_sha1_file(const unsigned char *sha1, struct stat *st) |
391 | { | |
ace1534d | 392 | char *name = sha1_file_name(sha1); |
d5a63b99 | 393 | struct alternate_object_database *alt; |
ace1534d JH |
394 | |
395 | if (!stat(name, st)) | |
396 | return name; | |
9a217f2a | 397 | prepare_alt_odb(); |
d5a63b99 JH |
398 | for (alt = alt_odb_list; alt; alt = alt->next) { |
399 | name = alt->name; | |
ace1534d | 400 | fill_sha1_path(name, sha1); |
d5a63b99 JH |
401 | if (!stat(alt->base, st)) |
402 | return alt->base; | |
ace1534d JH |
403 | } |
404 | return NULL; | |
405 | } | |
406 | ||
60bb8b14 | 407 | static unsigned int pack_used_ctr; |
a53128b6 SP |
408 | static unsigned int pack_mmap_calls; |
409 | static unsigned int peak_pack_open_windows; | |
410 | static unsigned int pack_open_windows; | |
411 | static size_t peak_pack_mapped; | |
60bb8b14 | 412 | static size_t pack_mapped; |
9a217f2a | 413 | struct packed_git *packed_git; |
1f688557 | 414 | |
a53128b6 SP |
415 | void pack_report() |
416 | { | |
417 | fprintf(stderr, | |
e05db0fd PR |
418 | "pack_report: getpagesize() = %10" SZ_FMT "\n" |
419 | "pack_report: core.packedGitWindowSize = %10" SZ_FMT "\n" | |
420 | "pack_report: core.packedGitLimit = %10" SZ_FMT "\n", | |
78a28df9 | 421 | (size_t) getpagesize(), |
a53128b6 SP |
422 | packed_git_window_size, |
423 | packed_git_limit); | |
424 | fprintf(stderr, | |
425 | "pack_report: pack_used_ctr = %10u\n" | |
426 | "pack_report: pack_mmap_calls = %10u\n" | |
427 | "pack_report: pack_open_windows = %10u / %10u\n" | |
e05db0fd PR |
428 | "pack_report: pack_mapped = " |
429 | "%10" SZ_FMT " / %10" SZ_FMT "\n", | |
a53128b6 SP |
430 | pack_used_ctr, |
431 | pack_mmap_calls, | |
432 | pack_open_windows, peak_pack_open_windows, | |
433 | pack_mapped, peak_pack_mapped); | |
434 | } | |
435 | ||
42873078 | 436 | static int check_packed_git_idx(const char *path, struct packed_git *p) |
1f688557 JH |
437 | { |
438 | void *idx_map; | |
42873078 | 439 | struct pack_idx_header *hdr; |
dc49cd76 | 440 | size_t idx_size; |
74e34e1f | 441 | uint32_t version, nr, i, *index; |
e93ec6f9 | 442 | int fd = open(path, O_RDONLY); |
1f688557 | 443 | struct stat st; |
42873078 | 444 | |
1f688557 JH |
445 | if (fd < 0) |
446 | return -1; | |
447 | if (fstat(fd, &st)) { | |
448 | close(fd); | |
449 | return -1; | |
450 | } | |
dc49cd76 | 451 | idx_size = xsize_t(st.st_size); |
2d88451b SP |
452 | if (idx_size < 4 * 256 + 20 + 20) { |
453 | close(fd); | |
454 | return error("index file %s is too small", path); | |
455 | } | |
c4712e45 | 456 | idx_map = xmmap(NULL, idx_size, PROT_READ, MAP_PRIVATE, fd, 0); |
1f688557 | 457 | close(fd); |
1f688557 | 458 | |
42873078 NP |
459 | hdr = idx_map; |
460 | if (hdr->idx_signature == htonl(PACK_IDX_SIGNATURE)) { | |
74e34e1f NP |
461 | version = ntohl(hdr->idx_version); |
462 | if (version < 2 || version > 2) { | |
463 | munmap(idx_map, idx_size); | |
464 | return error("index file %s is version %d" | |
465 | " and is not supported by this binary" | |
466 | " (try upgrading GIT to a newer version)", | |
467 | path, version); | |
468 | } | |
469 | } else | |
470 | version = 1; | |
df1b059d | 471 | |
1f688557 | 472 | nr = 0; |
42873078 | 473 | index = idx_map; |
74e34e1f NP |
474 | if (version > 1) |
475 | index += 2; /* skip index header */ | |
1f688557 | 476 | for (i = 0; i < 256; i++) { |
326bf396 | 477 | uint32_t n = ntohl(index[i]); |
2d88451b SP |
478 | if (n < nr) { |
479 | munmap(idx_map, idx_size); | |
df1b059d | 480 | return error("non-monotonic index %s", path); |
2d88451b | 481 | } |
1f688557 JH |
482 | nr = n; |
483 | } | |
484 | ||
74e34e1f NP |
485 | if (version == 1) { |
486 | /* | |
487 | * Total size: | |
488 | * - 256 index entries 4 bytes each | |
489 | * - 24-byte entries * nr (20-byte sha1 + 4-byte offset) | |
490 | * - 20-byte SHA1 of the packfile | |
491 | * - 20-byte SHA1 file checksum | |
492 | */ | |
493 | if (idx_size != 4*256 + nr * 24 + 20 + 20) { | |
494 | munmap(idx_map, idx_size); | |
495 | return error("wrong index file size in %s", path); | |
496 | } | |
497 | } else if (version == 2) { | |
498 | /* | |
499 | * Minimum size: | |
500 | * - 8 bytes of header | |
501 | * - 256 index entries 4 bytes each | |
502 | * - 20-byte sha1 entry * nr | |
503 | * - 4-byte crc entry * nr | |
504 | * - 4-byte offset entry * nr | |
505 | * - 20-byte SHA1 of the packfile | |
506 | * - 20-byte SHA1 file checksum | |
507 | * And after the 4-byte offset table might be a | |
508 | * variable sized table containing 8-byte entries | |
509 | * for offsets larger than 2^31. | |
510 | */ | |
511 | unsigned long min_size = 8 + 4*256 + nr*(20 + 4 + 4) + 20 + 20; | |
512 | if (idx_size < min_size || idx_size > min_size + (nr - 1)*8) { | |
513 | munmap(idx_map, idx_size); | |
514 | return error("wrong index file size in %s", path); | |
515 | } | |
516 | if (idx_size != min_size) { | |
517 | /* make sure we can deal with large pack offsets */ | |
518 | off_t x = 0x7fffffffUL, y = 0xffffffffUL; | |
519 | if (x > (x + 1) || y > (y + 1)) { | |
520 | munmap(idx_map, idx_size); | |
521 | return error("pack too large for current definition of off_t in %s", path); | |
522 | } | |
523 | } | |
2d88451b | 524 | } |
1f688557 | 525 | |
74e34e1f | 526 | p->index_version = version; |
42873078 NP |
527 | p->index_data = idx_map; |
528 | p->index_size = idx_size; | |
57059091 | 529 | p->num_objects = nr; |
1f688557 JH |
530 | return 0; |
531 | } | |
532 | ||
11daf39b SP |
533 | static void scan_windows(struct packed_git *p, |
534 | struct packed_git **lru_p, | |
535 | struct pack_window **lru_w, | |
536 | struct pack_window **lru_l) | |
1f688557 | 537 | { |
11daf39b SP |
538 | struct pack_window *w, *w_l; |
539 | ||
540 | for (w_l = NULL, w = p->windows; w; w = w->next) { | |
541 | if (!w->inuse_cnt) { | |
542 | if (!*lru_w || w->last_used < (*lru_w)->last_used) { | |
543 | *lru_p = p; | |
544 | *lru_w = w; | |
545 | *lru_l = w_l; | |
54044bf8 | 546 | } |
54044bf8 | 547 | } |
11daf39b | 548 | w_l = w; |
f9253394 | 549 | } |
11daf39b SP |
550 | } |
551 | ||
d1efefa4 | 552 | static int unuse_one_window(struct packed_git *current, int keep_fd) |
11daf39b SP |
553 | { |
554 | struct packed_git *p, *lru_p = NULL; | |
555 | struct pack_window *lru_w = NULL, *lru_l = NULL; | |
556 | ||
557 | if (current) | |
558 | scan_windows(current, &lru_p, &lru_w, &lru_l); | |
559 | for (p = packed_git; p; p = p->next) | |
560 | scan_windows(p, &lru_p, &lru_w, &lru_l); | |
54044bf8 SP |
561 | if (lru_p) { |
562 | munmap(lru_w->base, lru_w->len); | |
563 | pack_mapped -= lru_w->len; | |
564 | if (lru_l) | |
565 | lru_l->next = lru_w->next; | |
566 | else { | |
567 | lru_p->windows = lru_w->next; | |
d1efefa4 | 568 | if (!lru_p->windows && lru_p->pack_fd != keep_fd) { |
54044bf8 SP |
569 | close(lru_p->pack_fd); |
570 | lru_p->pack_fd = -1; | |
571 | } | |
572 | } | |
573 | free(lru_w); | |
a53128b6 | 574 | pack_open_windows--; |
54044bf8 SP |
575 | return 1; |
576 | } | |
577 | return 0; | |
f9253394 JH |
578 | } |
579 | ||
d1efefa4 | 580 | void release_pack_memory(size_t need, int fd) |
97bfeb34 SP |
581 | { |
582 | size_t cur = pack_mapped; | |
d1efefa4 | 583 | while (need >= (cur - pack_mapped) && unuse_one_window(NULL, fd)) |
97bfeb34 SP |
584 | ; /* nothing */ |
585 | } | |
586 | ||
03e79c88 | 587 | void unuse_pack(struct pack_window **w_cursor) |
f9253394 | 588 | { |
03e79c88 SP |
589 | struct pack_window *w = *w_cursor; |
590 | if (w) { | |
591 | w->inuse_cnt--; | |
592 | *w_cursor = NULL; | |
593 | } | |
1f688557 JH |
594 | } |
595 | ||
3cf8b462 SP |
596 | /* |
597 | * Do not call this directly as this leaks p->pack_fd on error return; | |
598 | * call open_packed_git() instead. | |
599 | */ | |
600 | static int open_packed_git_1(struct packed_git *p) | |
1f688557 | 601 | { |
9bc879c1 SP |
602 | struct stat st; |
603 | struct pack_header hdr; | |
604 | unsigned char sha1[20]; | |
605 | unsigned char *idx_sha1; | |
2c039da8 | 606 | long fd_flag; |
9bc879c1 SP |
607 | |
608 | p->pack_fd = open(p->pack_name, O_RDONLY); | |
609 | if (p->pack_fd < 0 || fstat(p->pack_fd, &st)) | |
072db278 | 610 | return -1; |
9bc879c1 SP |
611 | |
612 | /* If we created the struct before we had the pack we lack size. */ | |
bf592c50 | 613 | if (!p->pack_size) { |
bf592c50 | 614 | if (!S_ISREG(st.st_mode)) |
072db278 | 615 | return error("packfile %s not a regular file", p->pack_name); |
bf592c50 | 616 | p->pack_size = st.st_size; |
9bc879c1 | 617 | } else if (p->pack_size != st.st_size) |
072db278 | 618 | return error("packfile %s size changed", p->pack_name); |
9bc879c1 | 619 | |
2c039da8 JH |
620 | /* We leave these file descriptors open with sliding mmap; |
621 | * there is no point keeping them open across exec(), though. | |
622 | */ | |
623 | fd_flag = fcntl(p->pack_fd, F_GETFD, 0); | |
624 | if (fd_flag < 0) | |
072db278 | 625 | return error("cannot determine file descriptor flags"); |
2c039da8 JH |
626 | fd_flag |= FD_CLOEXEC; |
627 | if (fcntl(p->pack_fd, F_SETFD, fd_flag) == -1) | |
072db278 | 628 | return error("cannot set FD_CLOEXEC"); |
2c039da8 | 629 | |
9bc879c1 | 630 | /* Verify we recognize this pack file format. */ |
e6e2bd62 | 631 | if (read_in_full(p->pack_fd, &hdr, sizeof(hdr)) != sizeof(hdr)) |
072db278 | 632 | return error("file %s is far too short to be a packfile", p->pack_name); |
9bc879c1 | 633 | if (hdr.hdr_signature != htonl(PACK_SIGNATURE)) |
072db278 | 634 | return error("file %s is not a GIT packfile", p->pack_name); |
9bc879c1 | 635 | if (!pack_version_ok(hdr.hdr_version)) |
072db278 | 636 | return error("packfile %s is version %u and not supported" |
9bc879c1 SP |
637 | " (try upgrading GIT to a newer version)", |
638 | p->pack_name, ntohl(hdr.hdr_version)); | |
639 | ||
640 | /* Verify the pack matches its index. */ | |
57059091 | 641 | if (p->num_objects != ntohl(hdr.hdr_entries)) |
072db278 | 642 | return error("packfile %s claims to have %u objects" |
57059091 NP |
643 | " while index indicates %u objects", |
644 | p->pack_name, ntohl(hdr.hdr_entries), | |
645 | p->num_objects); | |
9bc879c1 | 646 | if (lseek(p->pack_fd, p->pack_size - sizeof(sha1), SEEK_SET) == -1) |
072db278 | 647 | return error("end of packfile %s is unavailable", p->pack_name); |
e6e2bd62 | 648 | if (read_in_full(p->pack_fd, sha1, sizeof(sha1)) != sizeof(sha1)) |
072db278 | 649 | return error("packfile %s signature is unavailable", p->pack_name); |
42873078 | 650 | idx_sha1 = ((unsigned char *)p->index_data) + p->index_size - 40; |
9bc879c1 | 651 | if (hashcmp(sha1, idx_sha1)) |
072db278 SP |
652 | return error("packfile %s does not match index", p->pack_name); |
653 | return 0; | |
9bc879c1 SP |
654 | } |
655 | ||
3cf8b462 SP |
656 | static int open_packed_git(struct packed_git *p) |
657 | { | |
658 | if (!open_packed_git_1(p)) | |
659 | return 0; | |
660 | if (p->pack_fd != -1) { | |
661 | close(p->pack_fd); | |
662 | p->pack_fd = -1; | |
663 | } | |
664 | return -1; | |
665 | } | |
666 | ||
c4001d92 | 667 | static int in_window(struct pack_window *win, off_t offset) |
60bb8b14 SP |
668 | { |
669 | /* We must promise at least 20 bytes (one hash) after the | |
670 | * offset is available from this window, otherwise the offset | |
671 | * is not actually in this window and a different window (which | |
672 | * has that one hash excess) must be used. This is to support | |
673 | * the object header and delta base parsing routines below. | |
674 | */ | |
675 | off_t win_off = win->offset; | |
676 | return win_off <= offset | |
677 | && (offset + 20) <= (win_off + win->len); | |
678 | } | |
679 | ||
03e79c88 SP |
680 | unsigned char* use_pack(struct packed_git *p, |
681 | struct pack_window **w_cursor, | |
c4001d92 | 682 | off_t offset, |
03e79c88 | 683 | unsigned int *left) |
9bc879c1 | 684 | { |
60bb8b14 | 685 | struct pack_window *win = *w_cursor; |
03e79c88 | 686 | |
072db278 SP |
687 | if (p->pack_fd == -1 && open_packed_git(p)) |
688 | die("packfile %s cannot be accessed", p->pack_name); | |
60bb8b14 SP |
689 | |
690 | /* Since packfiles end in a hash of their content and its | |
691 | * pointless to ask for an offset into the middle of that | |
692 | * hash, and the in_window function above wouldn't match | |
693 | * don't allow an offset too close to the end of the file. | |
694 | */ | |
695 | if (offset > (p->pack_size - 20)) | |
696 | die("offset beyond end of packfile (truncated pack?)"); | |
697 | ||
698 | if (!win || !in_window(win, offset)) { | |
699 | if (win) | |
700 | win->inuse_cnt--; | |
701 | for (win = p->windows; win; win = win->next) { | |
702 | if (in_window(win, offset)) | |
703 | break; | |
704 | } | |
705 | if (!win) { | |
78a28df9 | 706 | size_t window_align = packed_git_window_size / 2; |
dc49cd76 | 707 | off_t len; |
60bb8b14 | 708 | win = xcalloc(1, sizeof(*win)); |
78a28df9 | 709 | win->offset = (offset / window_align) * window_align; |
dc49cd76 SP |
710 | len = p->pack_size - win->offset; |
711 | if (len > packed_git_window_size) | |
712 | len = packed_git_window_size; | |
713 | win->len = (size_t)len; | |
60bb8b14 | 714 | pack_mapped += win->len; |
11daf39b | 715 | while (packed_git_limit < pack_mapped |
d1efefa4 | 716 | && unuse_one_window(p, p->pack_fd)) |
60bb8b14 | 717 | ; /* nothing */ |
c4712e45 | 718 | win->base = xmmap(NULL, win->len, |
60bb8b14 SP |
719 | PROT_READ, MAP_PRIVATE, |
720 | p->pack_fd, win->offset); | |
721 | if (win->base == MAP_FAILED) | |
73b4e4be SP |
722 | die("packfile %s cannot be mapped: %s", |
723 | p->pack_name, | |
724 | strerror(errno)); | |
a53128b6 SP |
725 | pack_mmap_calls++; |
726 | pack_open_windows++; | |
727 | if (pack_mapped > peak_pack_mapped) | |
728 | peak_pack_mapped = pack_mapped; | |
729 | if (pack_open_windows > peak_pack_open_windows) | |
730 | peak_pack_open_windows = pack_open_windows; | |
60bb8b14 SP |
731 | win->next = p->windows; |
732 | p->windows = win; | |
733 | } | |
1f688557 | 734 | } |
03e79c88 SP |
735 | if (win != *w_cursor) { |
736 | win->last_used = pack_used_ctr++; | |
737 | win->inuse_cnt++; | |
738 | *w_cursor = win; | |
739 | } | |
60bb8b14 | 740 | offset -= win->offset; |
03e79c88 | 741 | if (left) |
dc49cd76 | 742 | *left = win->len - xsize_t(offset); |
03e79c88 | 743 | return win->base + offset; |
1f688557 JH |
744 | } |
745 | ||
42873078 | 746 | struct packed_git *add_packed_git(const char *path, int path_len, int local) |
1f688557 JH |
747 | { |
748 | struct stat st; | |
42873078 | 749 | struct packed_git *p = xmalloc(sizeof(*p) + path_len + 2); |
1f688557 | 750 | |
42873078 NP |
751 | /* |
752 | * Make sure a corresponding .pack file exists and that | |
753 | * the index looks sane. | |
754 | */ | |
755 | path_len -= strlen(".idx"); | |
756 | if (path_len < 1) | |
1f688557 | 757 | return NULL; |
42873078 NP |
758 | memcpy(p->pack_name, path, path_len); |
759 | strcpy(p->pack_name + path_len, ".pack"); | |
760 | if (stat(p->pack_name, &st) || !S_ISREG(st.st_mode) || | |
761 | check_packed_git_idx(path, p)) { | |
762 | free(p); | |
1f688557 JH |
763 | return NULL; |
764 | } | |
42873078 | 765 | |
1f688557 JH |
766 | /* ok, it looks sane as far as we can check without |
767 | * actually mapping the pack file. | |
768 | */ | |
1f688557 | 769 | p->pack_size = st.st_size; |
1f688557 | 770 | p->next = NULL; |
c41ee586 | 771 | p->windows = NULL; |
9bc879c1 | 772 | p->pack_fd = -1; |
9d835df2 | 773 | p->pack_local = local; |
b867092f | 774 | p->mtime = st.st_mtime; |
42873078 NP |
775 | if (path_len < 40 || get_sha1_hex(path + path_len - 40, p->sha1)) |
776 | hashclr(p->sha1); | |
1f688557 JH |
777 | return p; |
778 | } | |
779 | ||
bf592c50 | 780 | struct packed_git *parse_pack_index(unsigned char *sha1) |
c508df5e DB |
781 | { |
782 | char *path = sha1_pack_index_name(sha1); | |
783 | return parse_pack_index_file(sha1, path); | |
784 | } | |
785 | ||
42873078 NP |
786 | struct packed_git *parse_pack_index_file(const unsigned char *sha1, |
787 | const char *idx_path) | |
bf592c50 | 788 | { |
42873078 NP |
789 | const char *path = sha1_pack_name(sha1); |
790 | struct packed_git *p = xmalloc(sizeof(*p) + strlen(path) + 2); | |
bf592c50 | 791 | |
42873078 NP |
792 | if (check_packed_git_idx(idx_path, p)) { |
793 | free(p); | |
bf592c50 | 794 | return NULL; |
42873078 | 795 | } |
bf592c50 | 796 | |
bf592c50 | 797 | strcpy(p->pack_name, path); |
bf592c50 | 798 | p->pack_size = 0; |
bf592c50 | 799 | p->next = NULL; |
c41ee586 | 800 | p->windows = NULL; |
9bc879c1 | 801 | p->pack_fd = -1; |
e702496e | 802 | hashcpy(p->sha1, sha1); |
bf592c50 DB |
803 | return p; |
804 | } | |
805 | ||
806 | void install_packed_git(struct packed_git *pack) | |
807 | { | |
808 | pack->next = packed_git; | |
809 | packed_git = pack; | |
810 | } | |
811 | ||
9d835df2 | 812 | static void prepare_packed_git_one(char *objdir, int local) |
1f688557 JH |
813 | { |
814 | char path[PATH_MAX]; | |
815 | int len; | |
816 | DIR *dir; | |
817 | struct dirent *de; | |
818 | ||
819 | sprintf(path, "%s/pack", objdir); | |
820 | len = strlen(path); | |
821 | dir = opendir(path); | |
b5b16990 | 822 | if (!dir) { |
26125f6b | 823 | if (errno != ENOENT) |
bd2afde8 | 824 | error("unable to open object pack directory: %s: %s", |
26125f6b | 825 | path, strerror(errno)); |
1f688557 | 826 | return; |
b5b16990 | 827 | } |
1f688557 JH |
828 | path[len++] = '/'; |
829 | while ((de = readdir(dir)) != NULL) { | |
830 | int namelen = strlen(de->d_name); | |
831 | struct packed_git *p; | |
832 | ||
5bb1cda5 | 833 | if (!has_extension(de->d_name, ".idx")) |
1f688557 JH |
834 | continue; |
835 | ||
54a15a8d | 836 | /* Don't reopen a pack we already have. */ |
1f688557 | 837 | strcpy(path + len, de->d_name); |
86f7780c JK |
838 | for (p = packed_git; p; p = p->next) { |
839 | if (!memcmp(path, p->pack_name, len + namelen - 4)) | |
840 | break; | |
841 | } | |
842 | if (p) | |
843 | continue; | |
54a15a8d SP |
844 | /* See if it really is a valid .idx file with corresponding |
845 | * .pack file that we can map. | |
846 | */ | |
9d835df2 | 847 | p = add_packed_git(path, len + namelen, local); |
1f688557 JH |
848 | if (!p) |
849 | continue; | |
625e9421 | 850 | install_packed_git(p); |
1f688557 | 851 | } |
5b35bcd5 | 852 | closedir(dir); |
1f688557 JH |
853 | } |
854 | ||
b867092f JH |
855 | static int sort_pack(const void *a_, const void *b_) |
856 | { | |
857 | struct packed_git *a = *((struct packed_git **)a_); | |
858 | struct packed_git *b = *((struct packed_git **)b_); | |
859 | int st; | |
860 | ||
861 | /* | |
862 | * Local packs tend to contain objects specific to our | |
863 | * variant of the project than remote ones. In addition, | |
864 | * remote ones could be on a network mounted filesystem. | |
865 | * Favor local ones for these reasons. | |
866 | */ | |
867 | st = a->pack_local - b->pack_local; | |
868 | if (st) | |
869 | return -st; | |
870 | ||
871 | /* | |
872 | * Younger packs tend to contain more recent objects, | |
873 | * and more recent objects tend to get accessed more | |
874 | * often. | |
875 | */ | |
876 | if (a->mtime < b->mtime) | |
877 | return 1; | |
878 | else if (a->mtime == b->mtime) | |
879 | return 0; | |
880 | return -1; | |
881 | } | |
882 | ||
883 | static void rearrange_packed_git(void) | |
884 | { | |
885 | struct packed_git **ary, *p; | |
886 | int i, n; | |
887 | ||
888 | for (n = 0, p = packed_git; p; p = p->next) | |
889 | n++; | |
890 | if (n < 2) | |
891 | return; | |
892 | ||
893 | /* prepare an array of packed_git for easier sorting */ | |
894 | ary = xcalloc(n, sizeof(struct packed_git *)); | |
895 | for (n = 0, p = packed_git; p; p = p->next) | |
896 | ary[n++] = p; | |
897 | ||
898 | qsort(ary, n, sizeof(struct packed_git *), sort_pack); | |
899 | ||
900 | /* link them back again */ | |
901 | for (i = 0; i < n - 1; i++) | |
902 | ary[i]->next = ary[i + 1]; | |
903 | ary[n - 1]->next = NULL; | |
904 | packed_git = ary[0]; | |
905 | ||
906 | free(ary); | |
907 | } | |
908 | ||
637cdd9d | 909 | static int prepare_packed_git_run_once = 0; |
9a217f2a | 910 | void prepare_packed_git(void) |
1f688557 | 911 | { |
d5a63b99 | 912 | struct alternate_object_database *alt; |
1f688557 | 913 | |
637cdd9d | 914 | if (prepare_packed_git_run_once) |
1f688557 | 915 | return; |
9d835df2 | 916 | prepare_packed_git_one(get_object_directory(), 1); |
9a217f2a | 917 | prepare_alt_odb(); |
d5a63b99 | 918 | for (alt = alt_odb_list; alt; alt = alt->next) { |
1494e038 | 919 | alt->name[-1] = 0; |
9d835df2 | 920 | prepare_packed_git_one(alt->base, 0); |
1494e038 | 921 | alt->name[-1] = '/'; |
1f688557 | 922 | } |
b867092f | 923 | rearrange_packed_git(); |
637cdd9d JK |
924 | prepare_packed_git_run_once = 1; |
925 | } | |
926 | ||
fc04c412 | 927 | void reprepare_packed_git(void) |
637cdd9d JK |
928 | { |
929 | prepare_packed_git_run_once = 0; | |
930 | prepare_packed_git(); | |
1f688557 JH |
931 | } |
932 | ||
5d6ccf5c | 933 | int check_sha1_signature(const unsigned char *sha1, void *map, unsigned long size, const char *type) |
0fcfd160 LT |
934 | { |
935 | unsigned char real_sha1[20]; | |
7cfb5f36 | 936 | hash_sha1_file(map, size, type, real_sha1); |
a89fccd2 | 937 | return hashcmp(sha1, real_sha1) ? -1 : 0; |
0fcfd160 LT |
938 | } |
939 | ||
bb6b8e4f | 940 | void *map_sha1_file(const unsigned char *sha1, unsigned long *size) |
0fcfd160 | 941 | { |
0fcfd160 LT |
942 | struct stat st; |
943 | void *map; | |
144bde78 | 944 | int fd; |
ace1534d JH |
945 | char *filename = find_sha1_file(sha1, &st); |
946 | ||
947 | if (!filename) { | |
ace1534d JH |
948 | return NULL; |
949 | } | |
0fcfd160 | 950 | |
144bde78 | 951 | fd = open(filename, O_RDONLY | sha1_file_open_flag); |
0fcfd160 | 952 | if (fd < 0) { |
144bde78 LT |
953 | /* See if it works without O_NOATIME */ |
954 | switch (sha1_file_open_flag) { | |
955 | default: | |
956 | fd = open(filename, O_RDONLY); | |
957 | if (fd >= 0) | |
958 | break; | |
959 | /* Fallthrough */ | |
960 | case 0: | |
144bde78 LT |
961 | return NULL; |
962 | } | |
963 | ||
1f688557 JH |
964 | /* If it failed once, it will probably fail again. |
965 | * Stop using O_NOATIME | |
966 | */ | |
144bde78 | 967 | sha1_file_open_flag = 0; |
0fcfd160 | 968 | } |
dc49cd76 SP |
969 | *size = xsize_t(st.st_size); |
970 | map = xmmap(NULL, *size, PROT_READ, MAP_PRIVATE, fd, 0); | |
0fcfd160 | 971 | close(fd); |
0fcfd160 LT |
972 | return map; |
973 | } | |
974 | ||
726f852b | 975 | static int legacy_loose_object(unsigned char *map) |
bb6b8e4f JH |
976 | { |
977 | unsigned int word; | |
978 | ||
979 | /* | |
980 | * Is it a zlib-compressed buffer? If so, the first byte | |
981 | * must be 0x78 (15-bit window size, deflated), and the | |
982 | * first 16-bit word is evenly divisible by 31 | |
983 | */ | |
984 | word = (map[0] << 8) + map[1]; | |
985 | if (map[0] == 0x78 && !(word % 31)) | |
986 | return 1; | |
987 | else | |
988 | return 0; | |
989 | } | |
990 | ||
72518e9c | 991 | unsigned long unpack_object_header_gently(const unsigned char *buf, unsigned long len, enum object_type *type, unsigned long *sizep) |
c4483576 | 992 | { |
ad1ed5ee | 993 | unsigned shift; |
93821bd9 | 994 | unsigned char c; |
93821bd9 | 995 | unsigned long size; |
ad1ed5ee JH |
996 | unsigned long used = 0; |
997 | ||
998 | c = buf[used++]; | |
999 | *type = (c >> 4) & 7; | |
1000 | size = c & 15; | |
1001 | shift = 4; | |
1002 | while (c & 0x80) { | |
1003 | if (len <= used) | |
1004 | return 0; | |
1005 | if (sizeof(long) * 8 <= shift) | |
1006 | return 0; | |
1007 | c = buf[used++]; | |
1008 | size += (c & 0x7f) << shift; | |
1009 | shift += 7; | |
1010 | } | |
1011 | *sizep = size; | |
1012 | return used; | |
1013 | } | |
1014 | ||
1015 | static int unpack_sha1_header(z_stream *stream, unsigned char *map, unsigned long mapsize, void *buffer, unsigned long bufsiz) | |
1016 | { | |
1017 | unsigned long size, used; | |
1018 | static const char valid_loose_object_type[8] = { | |
1019 | 0, /* OBJ_EXT */ | |
1020 | 1, 1, 1, 1, /* "commit", "tree", "blob", "tag" */ | |
1021 | 0, /* "delta" and others are invalid in a loose object */ | |
93821bd9 | 1022 | }; |
ad1ed5ee | 1023 | enum object_type type; |
93821bd9 | 1024 | |
c4483576 LT |
1025 | /* Get the data stream */ |
1026 | memset(stream, 0, sizeof(*stream)); | |
1027 | stream->next_in = map; | |
1028 | stream->avail_in = mapsize; | |
1029 | stream->next_out = buffer; | |
93821bd9 LT |
1030 | stream->avail_out = bufsiz; |
1031 | ||
bb6b8e4f | 1032 | if (legacy_loose_object(map)) { |
93821bd9 LT |
1033 | inflateInit(stream); |
1034 | return inflate(stream, 0); | |
1035 | } | |
1036 | ||
726f852b NP |
1037 | |
1038 | /* | |
1039 | * There used to be a second loose object header format which | |
1040 | * was meant to mimic the in-pack format, allowing for direct | |
1041 | * copy of the object data. This format turned up not to be | |
1042 | * really worth it and we don't write it any longer. But we | |
1043 | * can still read it. | |
1044 | */ | |
ad1ed5ee JH |
1045 | used = unpack_object_header_gently(map, mapsize, &type, &size); |
1046 | if (!used || !valid_loose_object_type[type]) | |
93821bd9 | 1047 | return -1; |
ad1ed5ee JH |
1048 | map += used; |
1049 | mapsize -= used; | |
93821bd9 LT |
1050 | |
1051 | /* Set up the stream for the rest.. */ | |
1052 | stream->next_in = map; | |
1053 | stream->avail_in = mapsize; | |
c4483576 | 1054 | inflateInit(stream); |
93821bd9 LT |
1055 | |
1056 | /* And generate the fake traditional header */ | |
ad1ed5ee | 1057 | stream->total_out = 1 + snprintf(buffer, bufsiz, "%s %lu", |
df843662 | 1058 | typename(type), size); |
93821bd9 | 1059 | return 0; |
c4483576 LT |
1060 | } |
1061 | ||
7efbff75 | 1062 | static void *unpack_sha1_rest(z_stream *stream, void *buffer, unsigned long size, const unsigned char *sha1) |
5180cacc LT |
1063 | { |
1064 | int bytes = strlen(buffer) + 1; | |
d565b341 | 1065 | unsigned char *buf = xmalloc(1+size); |
93821bd9 | 1066 | unsigned long n; |
7efbff75 | 1067 | int status = Z_OK; |
5180cacc | 1068 | |
93821bd9 LT |
1069 | n = stream->total_out - bytes; |
1070 | if (n > size) | |
1071 | n = size; | |
1072 | memcpy(buf, (char *) buffer + bytes, n); | |
1073 | bytes = n; | |
456cdf6e LT |
1074 | if (bytes <= size) { |
1075 | /* | |
1076 | * The above condition must be (bytes <= size), not | |
1077 | * (bytes < size). In other words, even though we | |
1078 | * expect no more output and set avail_out to zer0, | |
1079 | * the input zlib stream may have bytes that express | |
1080 | * "this concludes the stream", and we *do* want to | |
1081 | * eat that input. | |
1082 | * | |
1083 | * Otherwise we would not be able to test that we | |
1084 | * consumed all the input to reach the expected size; | |
1085 | * we also want to check that zlib tells us that all | |
1086 | * went well with status == Z_STREAM_END at the end. | |
1087 | */ | |
5180cacc LT |
1088 | stream->next_out = buf + bytes; |
1089 | stream->avail_out = size - bytes; | |
7efbff75 JH |
1090 | while (status == Z_OK) |
1091 | status = inflate(stream, Z_FINISH); | |
5180cacc LT |
1092 | } |
1093 | buf[size] = 0; | |
456cdf6e | 1094 | if (status == Z_STREAM_END && !stream->avail_in) { |
7efbff75 JH |
1095 | inflateEnd(stream); |
1096 | return buf; | |
1097 | } | |
1098 | ||
1099 | if (status < 0) | |
1100 | error("corrupt loose object '%s'", sha1_to_hex(sha1)); | |
1101 | else if (stream->avail_in) | |
1102 | error("garbage at end of loose object '%s'", | |
1103 | sha1_to_hex(sha1)); | |
1104 | free(buf); | |
1105 | return NULL; | |
5180cacc LT |
1106 | } |
1107 | ||
1108 | /* | |
1109 | * We used to just use "sscanf()", but that's actually way | |
1110 | * too permissive for what we want to check. So do an anal | |
1111 | * object header parse by hand. | |
1112 | */ | |
21666f1a | 1113 | static int parse_sha1_header(const char *hdr, unsigned long *sizep) |
5180cacc | 1114 | { |
21666f1a | 1115 | char type[10]; |
5180cacc LT |
1116 | int i; |
1117 | unsigned long size; | |
1118 | ||
1119 | /* | |
1120 | * The type can be at most ten bytes (including the | |
1121 | * terminating '\0' that we add), and is followed by | |
21666f1a | 1122 | * a space. |
5180cacc | 1123 | */ |
21666f1a | 1124 | i = 0; |
5180cacc LT |
1125 | for (;;) { |
1126 | char c = *hdr++; | |
1127 | if (c == ' ') | |
1128 | break; | |
21666f1a NP |
1129 | type[i++] = c; |
1130 | if (i >= sizeof(type)) | |
5180cacc | 1131 | return -1; |
5180cacc | 1132 | } |
21666f1a | 1133 | type[i] = 0; |
5180cacc LT |
1134 | |
1135 | /* | |
1136 | * The length must follow immediately, and be in canonical | |
1137 | * decimal format (ie "010" is not valid). | |
1138 | */ | |
1139 | size = *hdr++ - '0'; | |
1140 | if (size > 9) | |
1141 | return -1; | |
1142 | if (size) { | |
1143 | for (;;) { | |
1144 | unsigned long c = *hdr - '0'; | |
1145 | if (c > 9) | |
1146 | break; | |
1147 | hdr++; | |
1148 | size = size * 10 + c; | |
1149 | } | |
1150 | } | |
1151 | *sizep = size; | |
1152 | ||
1153 | /* | |
1154 | * The length must be followed by a zero byte | |
1155 | */ | |
21666f1a | 1156 | return *hdr ? -1 : type_from_string(type); |
5180cacc LT |
1157 | } |
1158 | ||
7efbff75 | 1159 | static void *unpack_sha1_file(void *map, unsigned long mapsize, enum object_type *type, unsigned long *size, const unsigned char *sha1) |
0fcfd160 | 1160 | { |
5180cacc | 1161 | int ret; |
0fcfd160 | 1162 | z_stream stream; |
5180cacc | 1163 | char hdr[8192]; |
0fcfd160 | 1164 | |
5180cacc | 1165 | ret = unpack_sha1_header(&stream, map, mapsize, hdr, sizeof(hdr)); |
21666f1a | 1166 | if (ret < Z_OK || (*type = parse_sha1_header(hdr, size)) < 0) |
0fcfd160 LT |
1167 | return NULL; |
1168 | ||
7efbff75 | 1169 | return unpack_sha1_rest(&stream, hdr, *size, sha1); |
0fcfd160 LT |
1170 | } |
1171 | ||
54dab52a NP |
1172 | unsigned long get_size_from_delta(struct packed_git *p, |
1173 | struct pack_window **w_curs, | |
1174 | off_t curpos) | |
1175 | { | |
1176 | const unsigned char *data; | |
1177 | unsigned char delta_head[20], *in; | |
1178 | z_stream stream; | |
1179 | int st; | |
1180 | ||
1181 | memset(&stream, 0, sizeof(stream)); | |
1182 | stream.next_out = delta_head; | |
1183 | stream.avail_out = sizeof(delta_head); | |
1184 | ||
1185 | inflateInit(&stream); | |
1186 | do { | |
1187 | in = use_pack(p, w_curs, curpos, &stream.avail_in); | |
1188 | stream.next_in = in; | |
1189 | st = inflate(&stream, Z_FINISH); | |
1190 | curpos += stream.next_in - in; | |
1191 | } while ((st == Z_OK || st == Z_BUF_ERROR) && | |
1192 | stream.total_out < sizeof(delta_head)); | |
1193 | inflateEnd(&stream); | |
1194 | if ((st != Z_STREAM_END) && stream.total_out != sizeof(delta_head)) | |
1195 | die("delta data unpack-initial failed"); | |
1196 | ||
1197 | /* Examine the initial part of the delta to figure out | |
1198 | * the result size. | |
1199 | */ | |
1200 | data = delta_head; | |
1201 | ||
1202 | /* ignore base size */ | |
1203 | get_delta_hdr_size(&data, delta_head+sizeof(delta_head)); | |
1204 | ||
1205 | /* Read the result size */ | |
1206 | return get_delta_hdr_size(&data, delta_head+sizeof(delta_head)); | |
1207 | } | |
1208 | ||
c4001d92 | 1209 | static off_t get_delta_base(struct packed_git *p, |
03e79c88 | 1210 | struct pack_window **w_curs, |
c4001d92 | 1211 | off_t *curpos, |
21666f1a | 1212 | enum object_type type, |
c4001d92 | 1213 | off_t delta_obj_offset) |
eb32d236 | 1214 | { |
2b87c45b | 1215 | unsigned char *base_info = use_pack(p, w_curs, *curpos, NULL); |
c4001d92 | 1216 | off_t base_offset; |
eb32d236 | 1217 | |
8d8a4ea5 SP |
1218 | /* use_pack() assured us we have [base_info, base_info + 20) |
1219 | * as a range that we can look at without walking off the | |
1220 | * end of the mapped window. Its actually the hash size | |
1221 | * that is assured. An OFS_DELTA longer than the hash size | |
1222 | * is stupid, as then a REF_DELTA would be smaller to store. | |
1223 | */ | |
21666f1a | 1224 | if (type == OBJ_OFS_DELTA) { |
eb32d236 NP |
1225 | unsigned used = 0; |
1226 | unsigned char c = base_info[used++]; | |
1227 | base_offset = c & 127; | |
1228 | while (c & 128) { | |
1229 | base_offset += 1; | |
8723f216 | 1230 | if (!base_offset || MSB(base_offset, 7)) |
eb32d236 NP |
1231 | die("offset value overflow for delta base object"); |
1232 | c = base_info[used++]; | |
1233 | base_offset = (base_offset << 7) + (c & 127); | |
1234 | } | |
1235 | base_offset = delta_obj_offset - base_offset; | |
1236 | if (base_offset >= delta_obj_offset) | |
1237 | die("delta base offset out of bound"); | |
2b87c45b | 1238 | *curpos += used; |
21666f1a | 1239 | } else if (type == OBJ_REF_DELTA) { |
eb32d236 NP |
1240 | /* The base entry _must_ be in the same pack */ |
1241 | base_offset = find_pack_entry_one(base_info, p); | |
1242 | if (!base_offset) | |
1243 | die("failed to find delta-pack base object %s", | |
1244 | sha1_to_hex(base_info)); | |
2b87c45b | 1245 | *curpos += 20; |
eb32d236 NP |
1246 | } else |
1247 | die("I am totally screwed"); | |
2b87c45b | 1248 | return base_offset; |
eb32d236 NP |
1249 | } |
1250 | ||
f3bf9224 | 1251 | /* forward declaration for a mutually recursive function */ |
c4001d92 | 1252 | static int packed_object_info(struct packed_git *p, off_t offset, |
21666f1a | 1253 | unsigned long *sizep); |
f3bf9224 | 1254 | |
43057304 | 1255 | static int packed_delta_info(struct packed_git *p, |
03e79c88 | 1256 | struct pack_window **w_curs, |
c4001d92 | 1257 | off_t curpos, |
21666f1a | 1258 | enum object_type type, |
c4001d92 | 1259 | off_t obj_offset, |
43057304 | 1260 | unsigned long *sizep) |
5db47c2b | 1261 | { |
c4001d92 | 1262 | off_t base_offset; |
f3bf9224 | 1263 | |
21666f1a NP |
1264 | base_offset = get_delta_base(p, w_curs, &curpos, type, obj_offset); |
1265 | type = packed_object_info(p, base_offset, NULL); | |
f3bf9224 | 1266 | |
c62266f3 JH |
1267 | /* We choose to only get the type of the base object and |
1268 | * ignore potentially corrupt pack file that expects the delta | |
1269 | * based on a base with a wrong size. This saves tons of | |
1270 | * inflate() calls. | |
1271 | */ | |
54dab52a NP |
1272 | if (sizep) |
1273 | *sizep = get_size_from_delta(p, w_curs, curpos); | |
21666f1a NP |
1274 | |
1275 | return type; | |
5db47c2b JH |
1276 | } |
1277 | ||
2b87c45b NP |
1278 | static int unpack_object_header(struct packed_git *p, |
1279 | struct pack_window **w_curs, | |
c4001d92 | 1280 | off_t *curpos, |
2b87c45b | 1281 | unsigned long *sizep) |
a733cb60 | 1282 | { |
03e79c88 SP |
1283 | unsigned char *base; |
1284 | unsigned int left; | |
ad1ed5ee | 1285 | unsigned long used; |
2b87c45b | 1286 | enum object_type type; |
a733cb60 | 1287 | |
8d8a4ea5 SP |
1288 | /* use_pack() assures us we have [base, base + 20) available |
1289 | * as a range that we can look at at. (Its actually the hash | |
3dff5379 | 1290 | * size that is assured.) With our object header encoding |
8d8a4ea5 SP |
1291 | * the maximum deflated object size is 2^137, which is just |
1292 | * insane, so we know won't exceed what we have been given. | |
1293 | */ | |
2b87c45b NP |
1294 | base = use_pack(p, w_curs, *curpos, &left); |
1295 | used = unpack_object_header_gently(base, left, &type, sizep); | |
ad1ed5ee JH |
1296 | if (!used) |
1297 | die("object offset outside of pack file"); | |
2b87c45b | 1298 | *curpos += used; |
ad1ed5ee | 1299 | |
2b87c45b | 1300 | return type; |
a733cb60 LT |
1301 | } |
1302 | ||
21666f1a | 1303 | const char *packed_object_info_detail(struct packed_git *p, |
c4001d92 | 1304 | off_t obj_offset, |
21666f1a NP |
1305 | unsigned long *size, |
1306 | unsigned long *store_size, | |
1307 | unsigned int *delta_chain_length, | |
1308 | unsigned char *base_sha1) | |
ad8c80a5 | 1309 | { |
03e79c88 | 1310 | struct pack_window *w_curs = NULL; |
c4001d92 SP |
1311 | off_t curpos; |
1312 | unsigned long dummy; | |
43057304 | 1313 | unsigned char *next_sha1; |
21666f1a | 1314 | enum object_type type; |
ad8c80a5 | 1315 | |
43057304 | 1316 | *delta_chain_length = 0; |
2b87c45b | 1317 | curpos = obj_offset; |
21666f1a | 1318 | type = unpack_object_header(p, &w_curs, &curpos, size); |
43057304 NP |
1319 | |
1320 | for (;;) { | |
21666f1a | 1321 | switch (type) { |
43057304 | 1322 | default: |
08a19d87 | 1323 | die("pack %s contains unknown object type %d", |
21666f1a | 1324 | p->pack_name, type); |
43057304 NP |
1325 | case OBJ_COMMIT: |
1326 | case OBJ_TREE: | |
1327 | case OBJ_BLOB: | |
1328 | case OBJ_TAG: | |
43057304 | 1329 | *store_size = 0; /* notyet */ |
03e79c88 | 1330 | unuse_pack(&w_curs); |
21666f1a | 1331 | return typename(type); |
eb32d236 | 1332 | case OBJ_OFS_DELTA: |
21666f1a | 1333 | obj_offset = get_delta_base(p, &w_curs, &curpos, type, obj_offset); |
eb32d236 | 1334 | if (*delta_chain_length == 0) { |
2b87c45b | 1335 | /* TODO: find base_sha1 as pointed by curpos */ |
30fee062 | 1336 | hashclr(base_sha1); |
eb32d236 NP |
1337 | } |
1338 | break; | |
1339 | case OBJ_REF_DELTA: | |
2b87c45b | 1340 | next_sha1 = use_pack(p, &w_curs, curpos, NULL); |
43057304 NP |
1341 | if (*delta_chain_length == 0) |
1342 | hashcpy(base_sha1, next_sha1); | |
2b87c45b | 1343 | obj_offset = find_pack_entry_one(next_sha1, p); |
43057304 NP |
1344 | break; |
1345 | } | |
43057304 | 1346 | (*delta_chain_length)++; |
2b87c45b | 1347 | curpos = obj_offset; |
21666f1a | 1348 | type = unpack_object_header(p, &w_curs, &curpos, &dummy); |
ad8c80a5 | 1349 | } |
ad8c80a5 JH |
1350 | } |
1351 | ||
c4001d92 | 1352 | static int packed_object_info(struct packed_git *p, off_t obj_offset, |
21666f1a | 1353 | unsigned long *sizep) |
1f688557 | 1354 | { |
03e79c88 | 1355 | struct pack_window *w_curs = NULL; |
c4001d92 SP |
1356 | unsigned long size; |
1357 | off_t curpos = obj_offset; | |
21666f1a | 1358 | enum object_type type; |
5db47c2b | 1359 | |
21666f1a | 1360 | type = unpack_object_header(p, &w_curs, &curpos, &size); |
5db47c2b | 1361 | |
21666f1a | 1362 | switch (type) { |
eb32d236 NP |
1363 | case OBJ_OFS_DELTA: |
1364 | case OBJ_REF_DELTA: | |
21666f1a NP |
1365 | type = packed_delta_info(p, &w_curs, curpos, |
1366 | type, obj_offset, sizep); | |
2b87c45b | 1367 | break; |
a733cb60 | 1368 | case OBJ_COMMIT: |
a733cb60 | 1369 | case OBJ_TREE: |
a733cb60 | 1370 | case OBJ_BLOB: |
a733cb60 | 1371 | case OBJ_TAG: |
2b87c45b NP |
1372 | if (sizep) |
1373 | *sizep = size; | |
a69d0943 | 1374 | break; |
1f688557 | 1375 | default: |
08a19d87 | 1376 | die("pack %s contains unknown object type %d", |
21666f1a | 1377 | p->pack_name, type); |
1f688557 | 1378 | } |
2b87c45b | 1379 | unuse_pack(&w_curs); |
21666f1a | 1380 | return type; |
1f688557 JH |
1381 | } |
1382 | ||
eb950c19 | 1383 | static void *unpack_compressed_entry(struct packed_git *p, |
03e79c88 | 1384 | struct pack_window **w_curs, |
c4001d92 | 1385 | off_t curpos, |
eb950c19 | 1386 | unsigned long size) |
de530aaa SP |
1387 | { |
1388 | int st; | |
1389 | z_stream stream; | |
079afb18 | 1390 | unsigned char *buffer, *in; |
de530aaa SP |
1391 | |
1392 | buffer = xmalloc(size + 1); | |
1393 | buffer[size] = 0; | |
1394 | memset(&stream, 0, sizeof(stream)); | |
de530aaa SP |
1395 | stream.next_out = buffer; |
1396 | stream.avail_out = size; | |
1397 | ||
1398 | inflateInit(&stream); | |
079afb18 | 1399 | do { |
2b87c45b | 1400 | in = use_pack(p, w_curs, curpos, &stream.avail_in); |
079afb18 SP |
1401 | stream.next_in = in; |
1402 | st = inflate(&stream, Z_FINISH); | |
2b87c45b | 1403 | curpos += stream.next_in - in; |
079afb18 | 1404 | } while (st == Z_OK || st == Z_BUF_ERROR); |
de530aaa SP |
1405 | inflateEnd(&stream); |
1406 | if ((st != Z_STREAM_END) || stream.total_out != size) { | |
1407 | free(buffer); | |
1408 | return NULL; | |
1409 | } | |
1410 | ||
1411 | return buffer; | |
1412 | } | |
1413 | ||
e5e01619 LT |
1414 | #define MAX_DELTA_CACHE (256) |
1415 | ||
18bdec11 | 1416 | static size_t delta_base_cached; |
5e08ecbf NP |
1417 | |
1418 | static struct delta_base_cache_lru_list { | |
1419 | struct delta_base_cache_lru_list *prev; | |
1420 | struct delta_base_cache_lru_list *next; | |
1421 | } delta_base_cache_lru = { &delta_base_cache_lru, &delta_base_cache_lru }; | |
1422 | ||
e5e01619 | 1423 | static struct delta_base_cache_entry { |
5e08ecbf NP |
1424 | struct delta_base_cache_lru_list lru; |
1425 | void *data; | |
e5e01619 LT |
1426 | struct packed_git *p; |
1427 | off_t base_offset; | |
1428 | unsigned long size; | |
e5e01619 LT |
1429 | enum object_type type; |
1430 | } delta_base_cache[MAX_DELTA_CACHE]; | |
1431 | ||
1432 | static unsigned long pack_entry_hash(struct packed_git *p, off_t base_offset) | |
1433 | { | |
1434 | unsigned long hash; | |
1435 | ||
1436 | hash = (unsigned long)p + (unsigned long)base_offset; | |
1437 | hash += (hash >> 8) + (hash >> 16); | |
3358004a | 1438 | return hash % MAX_DELTA_CACHE; |
e5e01619 LT |
1439 | } |
1440 | ||
62f255ad | 1441 | static void *cache_or_unpack_entry(struct packed_git *p, off_t base_offset, |
a0cba108 | 1442 | unsigned long *base_size, enum object_type *type, int keep_cache) |
62f255ad | 1443 | { |
e5e01619 LT |
1444 | void *ret; |
1445 | unsigned long hash = pack_entry_hash(p, base_offset); | |
1446 | struct delta_base_cache_entry *ent = delta_base_cache + hash; | |
1447 | ||
1448 | ret = ent->data; | |
1449 | if (ret && ent->p == p && ent->base_offset == base_offset) | |
1450 | goto found_cache_entry; | |
62f255ad | 1451 | return unpack_entry(p, base_offset, type, base_size); |
e5e01619 LT |
1452 | |
1453 | found_cache_entry: | |
18bdec11 | 1454 | if (!keep_cache) { |
a0cba108 | 1455 | ent->data = NULL; |
5e08ecbf NP |
1456 | ent->lru.next->prev = ent->lru.prev; |
1457 | ent->lru.prev->next = ent->lru.next; | |
18bdec11 SP |
1458 | delta_base_cached -= ent->size; |
1459 | } | |
a0cba108 NP |
1460 | else { |
1461 | ret = xmalloc(ent->size + 1); | |
1462 | memcpy(ret, ent->data, ent->size); | |
1463 | ((char *)ret)[ent->size] = 0; | |
1464 | } | |
e5e01619 LT |
1465 | *type = ent->type; |
1466 | *base_size = ent->size; | |
1467 | return ret; | |
62f255ad LT |
1468 | } |
1469 | ||
18bdec11 SP |
1470 | static inline void release_delta_base_cache(struct delta_base_cache_entry *ent) |
1471 | { | |
1472 | if (ent->data) { | |
1473 | free(ent->data); | |
1474 | ent->data = NULL; | |
5e08ecbf NP |
1475 | ent->lru.next->prev = ent->lru.prev; |
1476 | ent->lru.prev->next = ent->lru.next; | |
18bdec11 SP |
1477 | delta_base_cached -= ent->size; |
1478 | } | |
1479 | } | |
1480 | ||
62f255ad LT |
1481 | static void add_delta_base_cache(struct packed_git *p, off_t base_offset, |
1482 | void *base, unsigned long base_size, enum object_type type) | |
1483 | { | |
5e08ecbf | 1484 | unsigned long hash = pack_entry_hash(p, base_offset); |
e5e01619 | 1485 | struct delta_base_cache_entry *ent = delta_base_cache + hash; |
5e08ecbf | 1486 | struct delta_base_cache_lru_list *lru; |
e5e01619 | 1487 | |
18bdec11 SP |
1488 | release_delta_base_cache(ent); |
1489 | delta_base_cached += base_size; | |
5e08ecbf NP |
1490 | |
1491 | for (lru = delta_base_cache_lru.next; | |
1492 | delta_base_cached > delta_base_cache_limit | |
1493 | && lru != &delta_base_cache_lru; | |
1494 | lru = lru->next) { | |
1495 | struct delta_base_cache_entry *f = (void *)lru; | |
18bdec11 SP |
1496 | if (f->type == OBJ_BLOB) |
1497 | release_delta_base_cache(f); | |
1498 | } | |
5e08ecbf NP |
1499 | for (lru = delta_base_cache_lru.next; |
1500 | delta_base_cached > delta_base_cache_limit | |
1501 | && lru != &delta_base_cache_lru; | |
1502 | lru = lru->next) { | |
1503 | struct delta_base_cache_entry *f = (void *)lru; | |
1504 | release_delta_base_cache(f); | |
1505 | } | |
18bdec11 | 1506 | |
e5e01619 LT |
1507 | ent->p = p; |
1508 | ent->base_offset = base_offset; | |
1509 | ent->type = type; | |
1510 | ent->data = base; | |
1511 | ent->size = base_size; | |
5e08ecbf NP |
1512 | ent->lru.next = &delta_base_cache_lru; |
1513 | ent->lru.prev = delta_base_cache_lru.prev; | |
1514 | delta_base_cache_lru.prev->next = &ent->lru; | |
1515 | delta_base_cache_lru.prev = &ent->lru; | |
62f255ad LT |
1516 | } |
1517 | ||
eb950c19 | 1518 | static void *unpack_delta_entry(struct packed_git *p, |
03e79c88 | 1519 | struct pack_window **w_curs, |
c4001d92 | 1520 | off_t curpos, |
1f688557 | 1521 | unsigned long delta_size, |
c4001d92 | 1522 | off_t obj_offset, |
21666f1a | 1523 | enum object_type *type, |
eb950c19 | 1524 | unsigned long *sizep) |
1f688557 | 1525 | { |
7c3e8be3 | 1526 | void *delta_data, *result, *base; |
c4001d92 SP |
1527 | unsigned long base_size; |
1528 | off_t base_offset; | |
43057304 | 1529 | |
21666f1a | 1530 | base_offset = get_delta_base(p, w_curs, &curpos, *type, obj_offset); |
a0cba108 | 1531 | base = cache_or_unpack_entry(p, base_offset, &base_size, type, 0); |
67686d95 | 1532 | if (!base) |
c4001d92 SP |
1533 | die("failed to read delta base object" |
1534 | " at %"PRIuMAX" from %s", | |
1535 | (uintmax_t)base_offset, p->pack_name); | |
67686d95 | 1536 | |
2b87c45b | 1537 | delta_data = unpack_compressed_entry(p, w_curs, curpos, delta_size); |
1f688557 JH |
1538 | result = patch_delta(base, base_size, |
1539 | delta_data, delta_size, | |
21666f1a | 1540 | sizep); |
1f688557 JH |
1541 | if (!result) |
1542 | die("failed to apply delta"); | |
1543 | free(delta_data); | |
62f255ad | 1544 | add_delta_base_cache(p, base_offset, base, base_size, *type); |
1f688557 JH |
1545 | return result; |
1546 | } | |
1547 | ||
c4001d92 | 1548 | void *unpack_entry(struct packed_git *p, off_t obj_offset, |
21666f1a | 1549 | enum object_type *type, unsigned long *sizep) |
1f688557 | 1550 | { |
03e79c88 | 1551 | struct pack_window *w_curs = NULL; |
c4001d92 | 1552 | off_t curpos = obj_offset; |
21666f1a | 1553 | void *data; |
1f688557 | 1554 | |
21666f1a NP |
1555 | *type = unpack_object_header(p, &w_curs, &curpos, sizep); |
1556 | switch (*type) { | |
eb32d236 NP |
1557 | case OBJ_OFS_DELTA: |
1558 | case OBJ_REF_DELTA: | |
21666f1a NP |
1559 | data = unpack_delta_entry(p, &w_curs, curpos, *sizep, |
1560 | obj_offset, type, sizep); | |
4d703a1a | 1561 | break; |
a733cb60 | 1562 | case OBJ_COMMIT: |
a733cb60 | 1563 | case OBJ_TREE: |
a733cb60 | 1564 | case OBJ_BLOB: |
a733cb60 | 1565 | case OBJ_TAG: |
21666f1a | 1566 | data = unpack_compressed_entry(p, &w_curs, curpos, *sizep); |
4d703a1a | 1567 | break; |
1f688557 | 1568 | default: |
21666f1a | 1569 | die("unknown object type %i in %s", *type, p->pack_name); |
1f688557 | 1570 | } |
03e79c88 | 1571 | unuse_pack(&w_curs); |
21666f1a | 1572 | return data; |
1f688557 JH |
1573 | } |
1574 | ||
d72308e0 NP |
1575 | const unsigned char *nth_packed_object_sha1(const struct packed_git *p, |
1576 | uint32_t n) | |
9a217f2a | 1577 | { |
42873078 | 1578 | const unsigned char *index = p->index_data; |
57059091 | 1579 | if (n >= p->num_objects) |
d72308e0 | 1580 | return NULL; |
74e34e1f NP |
1581 | index += 4 * 256; |
1582 | if (p->index_version == 1) { | |
1583 | return index + 24 * n + 4; | |
1584 | } else { | |
1585 | index += 8; | |
1586 | return index + 20 * n; | |
1587 | } | |
1588 | } | |
1589 | ||
1590 | static off_t nth_packed_object_offset(const struct packed_git *p, uint32_t n) | |
1591 | { | |
1592 | const unsigned char *index = p->index_data; | |
1593 | index += 4 * 256; | |
1594 | if (p->index_version == 1) { | |
1595 | return ntohl(*((uint32_t *)(index + 24 * n))); | |
1596 | } else { | |
1597 | uint32_t off; | |
1598 | index += 8 + p->num_objects * (20 + 4); | |
1599 | off = ntohl(*((uint32_t *)(index + 4 * n))); | |
1600 | if (!(off & 0x80000000)) | |
1601 | return off; | |
1602 | index += p->num_objects * 4 + (off & 0x7fffffff) * 8; | |
1603 | return (((uint64_t)ntohl(*((uint32_t *)(index + 0)))) << 32) | | |
1604 | ntohl(*((uint32_t *)(index + 4))); | |
1605 | } | |
9a217f2a JH |
1606 | } |
1607 | ||
c4001d92 | 1608 | off_t find_pack_entry_one(const unsigned char *sha1, |
43057304 | 1609 | struct packed_git *p) |
1f688557 | 1610 | { |
42873078 | 1611 | const uint32_t *level1_ofs = p->index_data; |
42873078 | 1612 | const unsigned char *index = p->index_data; |
74e34e1f | 1613 | unsigned hi, lo; |
42873078 | 1614 | |
74e34e1f NP |
1615 | if (p->index_version > 1) { |
1616 | level1_ofs += 2; | |
1617 | index += 8; | |
1618 | } | |
42873078 | 1619 | index += 4 * 256; |
74e34e1f NP |
1620 | hi = ntohl(level1_ofs[*sha1]); |
1621 | lo = ((*sha1 == 0x0) ? 0 : ntohl(level1_ofs[*sha1 - 1])); | |
1f688557 JH |
1622 | |
1623 | do { | |
74e34e1f NP |
1624 | unsigned mi = (lo + hi) / 2; |
1625 | unsigned x = (p->index_version > 1) ? (mi * 20) : (mi * 24 + 4); | |
1626 | int cmp = hashcmp(index + x, sha1); | |
43057304 | 1627 | if (!cmp) |
74e34e1f | 1628 | return nth_packed_object_offset(p, mi); |
1f688557 JH |
1629 | if (cmp > 0) |
1630 | hi = mi; | |
1631 | else | |
1632 | lo = mi+1; | |
1633 | } while (lo < hi); | |
1634 | return 0; | |
1635 | } | |
1636 | ||
d4ff6d92 SP |
1637 | static int matches_pack_name(struct packed_git *p, const char *ig) |
1638 | { | |
1639 | const char *last_c, *c; | |
1640 | ||
1641 | if (!strcmp(p->pack_name, ig)) | |
1642 | return 0; | |
1643 | ||
1644 | for (c = p->pack_name, last_c = c; *c;) | |
1645 | if (*c == '/') | |
1646 | last_c = ++c; | |
1647 | else | |
1648 | ++c; | |
1649 | if (!strcmp(last_c, ig)) | |
1650 | return 0; | |
1651 | ||
1652 | return 1; | |
1653 | } | |
1654 | ||
106d710b | 1655 | static int find_pack_entry(const unsigned char *sha1, struct pack_entry *e, const char **ignore_packed) |
1f688557 JH |
1656 | { |
1657 | struct packed_git *p; | |
c4001d92 | 1658 | off_t offset; |
43057304 | 1659 | |
1f688557 JH |
1660 | prepare_packed_git(); |
1661 | ||
1662 | for (p = packed_git; p; p = p->next) { | |
106d710b JH |
1663 | if (ignore_packed) { |
1664 | const char **ig; | |
1665 | for (ig = ignore_packed; *ig; ig++) | |
d4ff6d92 | 1666 | if (!matches_pack_name(p, *ig)) |
106d710b JH |
1667 | break; |
1668 | if (*ig) | |
1669 | continue; | |
1670 | } | |
43057304 NP |
1671 | offset = find_pack_entry_one(sha1, p); |
1672 | if (offset) { | |
c715f783 SP |
1673 | /* |
1674 | * We are about to tell the caller where they can | |
1675 | * locate the requested object. We better make | |
1676 | * sure the packfile is still here and can be | |
1677 | * accessed before supplying that answer, as | |
1678 | * it may have been deleted since the index | |
1679 | * was loaded! | |
1680 | */ | |
1681 | if (p->pack_fd == -1 && open_packed_git(p)) { | |
1682 | error("packfile %s cannot be accessed", p->pack_name); | |
1683 | continue; | |
1684 | } | |
43057304 NP |
1685 | e->offset = offset; |
1686 | e->p = p; | |
1687 | hashcpy(e->sha1, sha1); | |
1f688557 | 1688 | return 1; |
43057304 | 1689 | } |
1f688557 JH |
1690 | } |
1691 | return 0; | |
1692 | } | |
1693 | ||
bf592c50 DB |
1694 | struct packed_git *find_sha1_pack(const unsigned char *sha1, |
1695 | struct packed_git *packs) | |
1696 | { | |
1697 | struct packed_git *p; | |
bf592c50 DB |
1698 | |
1699 | for (p = packs; p; p = p->next) { | |
43057304 | 1700 | if (find_pack_entry_one(sha1, p)) |
bf592c50 DB |
1701 | return p; |
1702 | } | |
1703 | return NULL; | |
21666f1a | 1704 | |
bf592c50 DB |
1705 | } |
1706 | ||
21666f1a | 1707 | static int sha1_loose_object_info(const unsigned char *sha1, unsigned long *sizep) |
65c2e0c3 | 1708 | { |
36e4d74a | 1709 | int status; |
65c2e0c3 JH |
1710 | unsigned long mapsize, size; |
1711 | void *map; | |
1712 | z_stream stream; | |
d65a16f6 | 1713 | char hdr[32]; |
65c2e0c3 | 1714 | |
bb6b8e4f | 1715 | map = map_sha1_file(sha1, &mapsize); |
f0df4ed5 JS |
1716 | if (!map) |
1717 | return error("unable to find %s", sha1_to_hex(sha1)); | |
36e4d74a JH |
1718 | if (unpack_sha1_header(&stream, map, mapsize, hdr, sizeof(hdr)) < 0) |
1719 | status = error("unable to unpack %s header", | |
1720 | sha1_to_hex(sha1)); | |
21666f1a | 1721 | else if ((status = parse_sha1_header(hdr, &size)) < 0) |
36e4d74a | 1722 | status = error("unable to parse %s header", sha1_to_hex(sha1)); |
21666f1a NP |
1723 | else if (sizep) |
1724 | *sizep = size; | |
65c2e0c3 JH |
1725 | inflateEnd(&stream); |
1726 | munmap(map, mapsize); | |
1727 | return status; | |
1728 | } | |
1729 | ||
21666f1a | 1730 | int sha1_object_info(const unsigned char *sha1, unsigned long *sizep) |
f0df4ed5 | 1731 | { |
f0df4ed5 JS |
1732 | struct pack_entry e; |
1733 | ||
1734 | if (!find_pack_entry(sha1, &e, NULL)) { | |
1735 | reprepare_packed_git(); | |
1736 | if (!find_pack_entry(sha1, &e, NULL)) | |
21666f1a | 1737 | return sha1_loose_object_info(sha1, sizep); |
f0df4ed5 | 1738 | } |
21666f1a | 1739 | return packed_object_info(e.p, e.offset, sizep); |
f0df4ed5 JS |
1740 | } |
1741 | ||
21666f1a NP |
1742 | static void *read_packed_sha1(const unsigned char *sha1, |
1743 | enum object_type *type, unsigned long *size) | |
1f688557 JH |
1744 | { |
1745 | struct pack_entry e; | |
1746 | ||
8276c007 | 1747 | if (!find_pack_entry(sha1, &e, NULL)) |
1f688557 | 1748 | return NULL; |
8276c007 | 1749 | else |
a0cba108 | 1750 | return cache_or_unpack_entry(e.p, e.offset, size, type, 1); |
1f688557 JH |
1751 | } |
1752 | ||
d66b37bb JH |
1753 | /* |
1754 | * This is meant to hold a *small* number of objects that you would | |
1755 | * want read_sha1_file() to be able to return, but yet you do not want | |
1756 | * to write them into the object store (e.g. a browse-only | |
1757 | * application). | |
1758 | */ | |
1759 | static struct cached_object { | |
1760 | unsigned char sha1[20]; | |
21666f1a | 1761 | enum object_type type; |
d66b37bb JH |
1762 | void *buf; |
1763 | unsigned long size; | |
1764 | } *cached_objects; | |
1765 | static int cached_object_nr, cached_object_alloc; | |
1766 | ||
1767 | static struct cached_object *find_cached_object(const unsigned char *sha1) | |
1768 | { | |
1769 | int i; | |
1770 | struct cached_object *co = cached_objects; | |
1771 | ||
1772 | for (i = 0; i < cached_object_nr; i++, co++) { | |
1773 | if (!hashcmp(co->sha1, sha1)) | |
1774 | return co; | |
1775 | } | |
1776 | return NULL; | |
1777 | } | |
1778 | ||
21666f1a NP |
1779 | int pretend_sha1_file(void *buf, unsigned long len, enum object_type type, |
1780 | unsigned char *sha1) | |
d66b37bb JH |
1781 | { |
1782 | struct cached_object *co; | |
1783 | ||
21666f1a | 1784 | hash_sha1_file(buf, len, typename(type), sha1); |
d66b37bb JH |
1785 | if (has_sha1_file(sha1) || find_cached_object(sha1)) |
1786 | return 0; | |
1787 | if (cached_object_alloc <= cached_object_nr) { | |
1788 | cached_object_alloc = alloc_nr(cached_object_alloc); | |
1789 | cached_objects = xrealloc(cached_objects, | |
1790 | sizeof(*cached_objects) * | |
1791 | cached_object_alloc); | |
1792 | } | |
1793 | co = &cached_objects[cached_object_nr++]; | |
1794 | co->size = len; | |
21666f1a | 1795 | co->type = type; |
efa13f7b JH |
1796 | co->buf = xmalloc(len); |
1797 | memcpy(co->buf, buf, len); | |
d66b37bb JH |
1798 | hashcpy(co->sha1, sha1); |
1799 | return 0; | |
1800 | } | |
1801 | ||
21666f1a NP |
1802 | void *read_sha1_file(const unsigned char *sha1, enum object_type *type, |
1803 | unsigned long *size) | |
0fcfd160 LT |
1804 | { |
1805 | unsigned long mapsize; | |
1806 | void *map, *buf; | |
d66b37bb JH |
1807 | struct cached_object *co; |
1808 | ||
1809 | co = find_cached_object(sha1); | |
1810 | if (co) { | |
1811 | buf = xmalloc(co->size + 1); | |
1812 | memcpy(buf, co->buf, co->size); | |
1813 | ((char*)buf)[co->size] = 0; | |
21666f1a | 1814 | *type = co->type; |
d66b37bb JH |
1815 | *size = co->size; |
1816 | return buf; | |
1817 | } | |
0fcfd160 | 1818 | |
8276c007 PE |
1819 | buf = read_packed_sha1(sha1, type, size); |
1820 | if (buf) | |
1821 | return buf; | |
bb6b8e4f | 1822 | map = map_sha1_file(sha1, &mapsize); |
0fcfd160 | 1823 | if (map) { |
7efbff75 | 1824 | buf = unpack_sha1_file(map, mapsize, type, size, sha1); |
0fcfd160 LT |
1825 | munmap(map, mapsize); |
1826 | return buf; | |
1827 | } | |
637cdd9d | 1828 | reprepare_packed_git(); |
8276c007 | 1829 | return read_packed_sha1(sha1, type, size); |
0fcfd160 LT |
1830 | } |
1831 | ||
40469ee9 | 1832 | void *read_object_with_reference(const unsigned char *sha1, |
21666f1a | 1833 | const char *required_type_name, |
40469ee9 JH |
1834 | unsigned long *size, |
1835 | unsigned char *actual_sha1_return) | |
f4913f91 | 1836 | { |
21666f1a | 1837 | enum object_type type, required_type; |
f4913f91 JH |
1838 | void *buffer; |
1839 | unsigned long isize; | |
40469ee9 | 1840 | unsigned char actual_sha1[20]; |
f4913f91 | 1841 | |
21666f1a | 1842 | required_type = type_from_string(required_type_name); |
e702496e | 1843 | hashcpy(actual_sha1, sha1); |
40469ee9 JH |
1844 | while (1) { |
1845 | int ref_length = -1; | |
1846 | const char *ref_type = NULL; | |
f4913f91 | 1847 | |
21666f1a | 1848 | buffer = read_sha1_file(actual_sha1, &type, &isize); |
40469ee9 JH |
1849 | if (!buffer) |
1850 | return NULL; | |
21666f1a | 1851 | if (type == required_type) { |
40469ee9 JH |
1852 | *size = isize; |
1853 | if (actual_sha1_return) | |
e702496e | 1854 | hashcpy(actual_sha1_return, actual_sha1); |
40469ee9 JH |
1855 | return buffer; |
1856 | } | |
1857 | /* Handle references */ | |
21666f1a | 1858 | else if (type == OBJ_COMMIT) |
40469ee9 | 1859 | ref_type = "tree "; |
21666f1a | 1860 | else if (type == OBJ_TAG) |
40469ee9 JH |
1861 | ref_type = "object "; |
1862 | else { | |
1863 | free(buffer); | |
1864 | return NULL; | |
1865 | } | |
1866 | ref_length = strlen(ref_type); | |
f4913f91 | 1867 | |
40469ee9 | 1868 | if (memcmp(buffer, ref_type, ref_length) || |
1d7f171c | 1869 | get_sha1_hex((char *) buffer + ref_length, actual_sha1)) { |
40469ee9 JH |
1870 | free(buffer); |
1871 | return NULL; | |
1872 | } | |
1cf58e72 | 1873 | free(buffer); |
40469ee9 JH |
1874 | /* Now we have the ID of the referred-to object in |
1875 | * actual_sha1. Check again. */ | |
f4913f91 | 1876 | } |
f4913f91 JH |
1877 | } |
1878 | ||
ce9fbf16 | 1879 | static void write_sha1_file_prepare(const void *buf, unsigned long len, |
972a9155 | 1880 | const char *type, unsigned char *sha1, |
d65a16f6 | 1881 | char *hdr, int *hdrlen) |
d410c0f5 JH |
1882 | { |
1883 | SHA_CTX c; | |
1884 | ||
1885 | /* Generate the header */ | |
d65a16f6 | 1886 | *hdrlen = sprintf(hdr, "%s %lu", type, len)+1; |
d410c0f5 JH |
1887 | |
1888 | /* Sha1.. */ | |
1889 | SHA1_Init(&c); | |
1890 | SHA1_Update(&c, hdr, *hdrlen); | |
1891 | SHA1_Update(&c, buf, len); | |
1892 | SHA1_Final(sha1, &c); | |
d410c0f5 JH |
1893 | } |
1894 | ||
230f1322 LT |
1895 | /* |
1896 | * Link the tempfile to the final place, possibly creating the | |
1897 | * last directory level as you do so. | |
1898 | * | |
1899 | * Returns the errno on failure, 0 on success. | |
1900 | */ | |
839837b9 | 1901 | static int link_temp_to_file(const char *tmpfile, const char *filename) |
230f1322 LT |
1902 | { |
1903 | int ret; | |
756aaf4a | 1904 | char *dir; |
230f1322 LT |
1905 | |
1906 | if (!link(tmpfile, filename)) | |
1907 | return 0; | |
1908 | ||
1909 | /* | |
756aaf4a | 1910 | * Try to mkdir the last path component if that failed. |
230f1322 LT |
1911 | * |
1912 | * Re-try the "link()" regardless of whether the mkdir | |
1913 | * succeeds, since a race might mean that somebody | |
1914 | * else succeeded. | |
1915 | */ | |
1916 | ret = errno; | |
756aaf4a SP |
1917 | dir = strrchr(filename, '/'); |
1918 | if (dir) { | |
1919 | *dir = 0; | |
866cae0d | 1920 | if (!mkdir(filename, 0777) && adjust_shared_perm(filename)) { |
91c23e48 | 1921 | *dir = '/'; |
756aaf4a | 1922 | return -2; |
91c23e48 | 1923 | } |
756aaf4a SP |
1924 | *dir = '/'; |
1925 | if (!link(tmpfile, filename)) | |
1926 | return 0; | |
1927 | ret = errno; | |
230f1322 LT |
1928 | } |
1929 | return ret; | |
1930 | } | |
1931 | ||
1932 | /* | |
1933 | * Move the just written object into its final resting place | |
1934 | */ | |
839837b9 | 1935 | int move_temp_to_file(const char *tmpfile, const char *filename) |
230f1322 LT |
1936 | { |
1937 | int ret = link_temp_to_file(tmpfile, filename); | |
7ebb6fca LT |
1938 | |
1939 | /* | |
1940 | * Coda hack - coda doesn't like cross-directory links, | |
1941 | * so we fall back to a rename, which will mean that it | |
1942 | * won't be able to check collisions, but that's not a | |
1943 | * big deal. | |
1944 | * | |
1945 | * The same holds for FAT formatted media. | |
1946 | * | |
1947 | * When this succeeds, we just return 0. We have nothing | |
1948 | * left to unlink. | |
1949 | */ | |
1950 | if (ret && ret != EEXIST) { | |
1951 | if (!rename(tmpfile, filename)) | |
230f1322 | 1952 | return 0; |
9e48b389 | 1953 | ret = errno; |
230f1322 LT |
1954 | } |
1955 | unlink(tmpfile); | |
1956 | if (ret) { | |
1957 | if (ret != EEXIST) { | |
916d081b | 1958 | return error("unable to write sha1 filename %s: %s\n", filename, strerror(ret)); |
230f1322 LT |
1959 | } |
1960 | /* FIXME!!! Collision check here ? */ | |
1961 | } | |
1962 | ||
1963 | return 0; | |
1964 | } | |
1965 | ||
4d548150 LT |
1966 | static int write_buffer(int fd, const void *buf, size_t len) |
1967 | { | |
d34cf19b | 1968 | if (write_in_full(fd, buf, len) < 0) |
93822c22 | 1969 | return error("file write error (%s)", strerror(errno)); |
4d548150 LT |
1970 | return 0; |
1971 | } | |
1972 | ||
ce9fbf16 | 1973 | int hash_sha1_file(const void *buf, unsigned long len, const char *type, |
abdc3fc8 RS |
1974 | unsigned char *sha1) |
1975 | { | |
d65a16f6 | 1976 | char hdr[32]; |
abdc3fc8 RS |
1977 | int hdrlen; |
1978 | write_sha1_file_prepare(buf, len, type, sha1, hdr, &hdrlen); | |
1979 | return 0; | |
1980 | } | |
1981 | ||
bf0f910d | 1982 | int write_sha1_file(void *buf, unsigned long len, const char *type, unsigned char *returnsha1) |
0fcfd160 | 1983 | { |
ac54c277 | 1984 | int size, ret; |
bf0f910d | 1985 | unsigned char *compressed; |
0fcfd160 LT |
1986 | z_stream stream; |
1987 | unsigned char sha1[20]; | |
706bc531 | 1988 | char *filename; |
aac17941 | 1989 | static char tmpfile[PATH_MAX]; |
d65a16f6 | 1990 | char hdr[32]; |
230f1322 | 1991 | int fd, hdrlen; |
a44c9a5e | 1992 | |
d410c0f5 JH |
1993 | /* Normally if we have it in the pack then we do not bother writing |
1994 | * it out into .git/objects/??/?{38} file. | |
1995 | */ | |
972a9155 RS |
1996 | write_sha1_file_prepare(buf, len, type, sha1, hdr, &hdrlen); |
1997 | filename = sha1_file_name(sha1); | |
706bc531 | 1998 | if (returnsha1) |
e702496e | 1999 | hashcpy(returnsha1, sha1); |
d410c0f5 JH |
2000 | if (has_sha1_file(sha1)) |
2001 | return 0; | |
aac17941 LT |
2002 | fd = open(filename, O_RDONLY); |
2003 | if (fd >= 0) { | |
706bc531 | 2004 | /* |
aac17941 LT |
2005 | * FIXME!!! We might do collision checking here, but we'd |
2006 | * need to uncompress the old file and check it. Later. | |
706bc531 | 2007 | */ |
aac17941 | 2008 | close(fd); |
706bc531 LT |
2009 | return 0; |
2010 | } | |
2011 | ||
aac17941 | 2012 | if (errno != ENOENT) { |
916d081b | 2013 | return error("sha1 file %s: %s\n", filename, strerror(errno)); |
aac17941 LT |
2014 | } |
2015 | ||
0e55181f | 2016 | snprintf(tmpfile, sizeof(tmpfile), "%s/tmp_obj_XXXXXX", get_object_directory()); |
ace1534d | 2017 | |
aac17941 LT |
2018 | fd = mkstemp(tmpfile); |
2019 | if (fd < 0) { | |
916d081b PB |
2020 | if (errno == EPERM) |
2021 | return error("insufficient permission for adding an object to repository database %s\n", get_object_directory()); | |
2022 | else | |
2023 | return error("unable to create temporary sha1 filename %s: %s\n", tmpfile, strerror(errno)); | |
aac17941 LT |
2024 | } |
2025 | ||
0fcfd160 LT |
2026 | /* Set it up */ |
2027 | memset(&stream, 0, sizeof(stream)); | |
12f6c308 | 2028 | deflateInit(&stream, zlib_compression_level); |
93821bd9 | 2029 | size = 8 + deflateBound(&stream, len+hdrlen); |
812666c8 | 2030 | compressed = xmalloc(size); |
0fcfd160 LT |
2031 | |
2032 | /* Compress it */ | |
0fcfd160 LT |
2033 | stream.next_out = compressed; |
2034 | stream.avail_out = size; | |
a44c9a5e LT |
2035 | |
2036 | /* First header.. */ | |
d65a16f6 | 2037 | stream.next_in = (unsigned char *)hdr; |
a44c9a5e | 2038 | stream.avail_in = hdrlen; |
726f852b NP |
2039 | while (deflate(&stream, 0) == Z_OK) |
2040 | /* nothing */; | |
a44c9a5e LT |
2041 | |
2042 | /* Then the data itself.. */ | |
2043 | stream.next_in = buf; | |
2044 | stream.avail_in = len; | |
ac54c277 LT |
2045 | ret = deflate(&stream, Z_FINISH); |
2046 | if (ret != Z_STREAM_END) | |
2047 | die("unable to deflate new object %s (%d)", sha1_to_hex(sha1), ret); | |
2048 | ||
2049 | ret = deflateEnd(&stream); | |
2050 | if (ret != Z_OK) | |
2051 | die("deflateEnd on object %s failed (%d)", sha1_to_hex(sha1), ret); | |
2052 | ||
0fcfd160 LT |
2053 | size = stream.total_out; |
2054 | ||
4d548150 LT |
2055 | if (write_buffer(fd, compressed, size) < 0) |
2056 | die("unable to write sha1 file"); | |
aac17941 | 2057 | fchmod(fd, 0444); |
e82973cf JH |
2058 | if (close(fd)) |
2059 | die("unable to write sha1 file"); | |
383f85b7 | 2060 | free(compressed); |
0fcfd160 | 2061 | |
230f1322 | 2062 | return move_temp_to_file(tmpfile, filename); |
0fcfd160 | 2063 | } |
8237b185 | 2064 | |
4d548150 LT |
2065 | /* |
2066 | * We need to unpack and recompress the object for writing | |
2067 | * it out to a different file. | |
2068 | */ | |
2069 | static void *repack_object(const unsigned char *sha1, unsigned long *objsize) | |
a5eda52b | 2070 | { |
4d548150 | 2071 | size_t size; |
a5eda52b | 2072 | z_stream stream; |
4d548150 LT |
2073 | unsigned char *unpacked; |
2074 | unsigned long len; | |
21666f1a | 2075 | enum object_type type; |
d65a16f6 | 2076 | char hdr[32]; |
4d548150 LT |
2077 | int hdrlen; |
2078 | void *buf; | |
bfc66daf | 2079 | |
a9486b02 | 2080 | /* need to unpack and recompress it by itself */ |
21666f1a | 2081 | unpacked = read_packed_sha1(sha1, &type, &len); |
8276c007 PE |
2082 | if (!unpacked) |
2083 | error("cannot read sha1_file for %s", sha1_to_hex(sha1)); | |
a5eda52b | 2084 | |
21666f1a | 2085 | hdrlen = sprintf(hdr, "%s %lu", typename(type), len) + 1; |
a5eda52b | 2086 | |
4d548150 LT |
2087 | /* Set it up */ |
2088 | memset(&stream, 0, sizeof(stream)); | |
12f6c308 | 2089 | deflateInit(&stream, zlib_compression_level); |
4d548150 LT |
2090 | size = deflateBound(&stream, len + hdrlen); |
2091 | buf = xmalloc(size); | |
a5eda52b | 2092 | |
4d548150 LT |
2093 | /* Compress it */ |
2094 | stream.next_out = buf; | |
2095 | stream.avail_out = size; | |
a5eda52b | 2096 | |
4d548150 LT |
2097 | /* First header.. */ |
2098 | stream.next_in = (void *)hdr; | |
2099 | stream.avail_in = hdrlen; | |
2100 | while (deflate(&stream, 0) == Z_OK) | |
2101 | /* nothing */; | |
bfc66daf | 2102 | |
4d548150 LT |
2103 | /* Then the data itself.. */ |
2104 | stream.next_in = unpacked; | |
2105 | stream.avail_in = len; | |
2106 | while (deflate(&stream, Z_FINISH) == Z_OK) | |
2107 | /* nothing */; | |
2108 | deflateEnd(&stream); | |
2109 | free(unpacked); | |
bfc66daf | 2110 | |
4d548150 LT |
2111 | *objsize = stream.total_out; |
2112 | return buf; | |
2113 | } | |
2114 | ||
2115 | int write_sha1_to_fd(int fd, const unsigned char *sha1) | |
2116 | { | |
2117 | int retval; | |
2118 | unsigned long objsize; | |
bb6b8e4f | 2119 | void *buf = map_sha1_file(sha1, &objsize); |
4d548150 LT |
2120 | |
2121 | if (buf) { | |
2122 | retval = write_buffer(fd, buf, objsize); | |
2123 | munmap(buf, objsize); | |
2124 | return retval; | |
2125 | } | |
2126 | ||
2127 | buf = repack_object(sha1, &objsize); | |
2128 | retval = write_buffer(fd, buf, objsize); | |
2129 | free(buf); | |
2130 | return retval; | |
a5eda52b DB |
2131 | } |
2132 | ||
70b9829e DB |
2133 | int write_sha1_from_fd(const unsigned char *sha1, int fd, char *buffer, |
2134 | size_t bufsize, size_t *bufposn) | |
8237b185 | 2135 | { |
230f1322 | 2136 | char tmpfile[PATH_MAX]; |
8237b185 DB |
2137 | int local; |
2138 | z_stream stream; | |
2139 | unsigned char real_sha1[20]; | |
bf0f910d | 2140 | unsigned char discard[4096]; |
8237b185 DB |
2141 | int ret; |
2142 | SHA_CTX c; | |
2143 | ||
0e55181f | 2144 | snprintf(tmpfile, sizeof(tmpfile), "%s/tmp_obj_XXXXXX", get_object_directory()); |
8237b185 | 2145 | |
230f1322 | 2146 | local = mkstemp(tmpfile); |
916d081b PB |
2147 | if (local < 0) { |
2148 | if (errno == EPERM) | |
2149 | return error("insufficient permission for adding an object to repository database %s\n", get_object_directory()); | |
2150 | else | |
2151 | return error("unable to create temporary sha1 filename %s: %s\n", tmpfile, strerror(errno)); | |
2152 | } | |
8237b185 DB |
2153 | |
2154 | memset(&stream, 0, sizeof(stream)); | |
2155 | ||
2156 | inflateInit(&stream); | |
2157 | ||
2158 | SHA1_Init(&c); | |
2159 | ||
2160 | do { | |
2161 | ssize_t size; | |
70b9829e DB |
2162 | if (*bufposn) { |
2163 | stream.avail_in = *bufposn; | |
96ad15ae | 2164 | stream.next_in = (unsigned char *) buffer; |
70b9829e DB |
2165 | do { |
2166 | stream.next_out = discard; | |
2167 | stream.avail_out = sizeof(discard); | |
2168 | ret = inflate(&stream, Z_SYNC_FLUSH); | |
2169 | SHA1_Update(&c, discard, sizeof(discard) - | |
2170 | stream.avail_out); | |
2171 | } while (stream.avail_in && ret == Z_OK); | |
4d548150 LT |
2172 | if (write_buffer(local, buffer, *bufposn - stream.avail_in) < 0) |
2173 | die("unable to write sha1 file"); | |
70b9829e DB |
2174 | memmove(buffer, buffer + *bufposn - stream.avail_in, |
2175 | stream.avail_in); | |
2176 | *bufposn = stream.avail_in; | |
2177 | if (ret != Z_OK) | |
2178 | break; | |
2179 | } | |
93d26e4c | 2180 | size = xread(fd, buffer + *bufposn, bufsize - *bufposn); |
8237b185 DB |
2181 | if (size <= 0) { |
2182 | close(local); | |
230f1322 | 2183 | unlink(tmpfile); |
8237b185 DB |
2184 | if (!size) |
2185 | return error("Connection closed?"); | |
2186 | perror("Reading from connection"); | |
2187 | return -1; | |
2188 | } | |
70b9829e DB |
2189 | *bufposn += size; |
2190 | } while (1); | |
8237b185 DB |
2191 | inflateEnd(&stream); |
2192 | ||
b5b8d814 | 2193 | fchmod(local, 0444); |
0d315468 JM |
2194 | if (close(local) != 0) |
2195 | die("unable to write sha1 file"); | |
8237b185 DB |
2196 | SHA1_Final(real_sha1, &c); |
2197 | if (ret != Z_STREAM_END) { | |
230f1322 | 2198 | unlink(tmpfile); |
8237b185 DB |
2199 | return error("File %s corrupted", sha1_to_hex(sha1)); |
2200 | } | |
a89fccd2 | 2201 | if (hashcmp(sha1, real_sha1)) { |
230f1322 | 2202 | unlink(tmpfile); |
bd2afde8 | 2203 | return error("File %s has bad hash", sha1_to_hex(sha1)); |
8237b185 | 2204 | } |
230f1322 LT |
2205 | |
2206 | return move_temp_to_file(tmpfile, sha1_file_name(sha1)); | |
8237b185 DB |
2207 | } |
2208 | ||
bf592c50 DB |
2209 | int has_pack_index(const unsigned char *sha1) |
2210 | { | |
2211 | struct stat st; | |
2212 | if (stat(sha1_pack_index_name(sha1), &st)) | |
2213 | return 0; | |
2214 | return 1; | |
2215 | } | |
2216 | ||
2217 | int has_pack_file(const unsigned char *sha1) | |
2218 | { | |
2219 | struct stat st; | |
2220 | if (stat(sha1_pack_name(sha1), &st)) | |
2221 | return 0; | |
2222 | return 1; | |
2223 | } | |
2224 | ||
106d710b | 2225 | int has_sha1_pack(const unsigned char *sha1, const char **ignore_packed) |
dade09c2 LT |
2226 | { |
2227 | struct pack_entry e; | |
106d710b | 2228 | return find_pack_entry(sha1, &e, ignore_packed); |
dade09c2 LT |
2229 | } |
2230 | ||
8237b185 DB |
2231 | int has_sha1_file(const unsigned char *sha1) |
2232 | { | |
8237b185 | 2233 | struct stat st; |
1f688557 JH |
2234 | struct pack_entry e; |
2235 | ||
106d710b | 2236 | if (find_pack_entry(sha1, &e, NULL)) |
1f688557 | 2237 | return 1; |
ab90ea5d | 2238 | return find_sha1_file(sha1, &st) ? 1 : 0; |
8237b185 | 2239 | } |
74400e71 | 2240 | |
e7332f96 BE |
2241 | /* |
2242 | * reads from fd as long as possible into a supplied buffer of size bytes. | |
82e5a82f | 2243 | * If necessary the buffer's size is increased using realloc() |
e7332f96 BE |
2244 | * |
2245 | * returns 0 if anything went fine and -1 otherwise | |
2246 | * | |
2247 | * NOTE: both buf and size may change, but even when -1 is returned | |
2248 | * you still have to free() it yourself. | |
2249 | */ | |
2250 | int read_pipe(int fd, char** return_buf, unsigned long* return_size) | |
024510c8 | 2251 | { |
e7332f96 BE |
2252 | char* buf = *return_buf; |
2253 | unsigned long size = *return_size; | |
8a912bcb | 2254 | ssize_t iret; |
024510c8 | 2255 | unsigned long off = 0; |
e7332f96 | 2256 | |
024510c8 | 2257 | do { |
e7332f96 | 2258 | iret = xread(fd, buf + off, size - off); |
024510c8 DB |
2259 | if (iret > 0) { |
2260 | off += iret; | |
2261 | if (off == size) { | |
2262 | size *= 2; | |
83572c1a | 2263 | buf = xrealloc(buf, size); |
024510c8 DB |
2264 | } |
2265 | } | |
2266 | } while (iret > 0); | |
e7332f96 BE |
2267 | |
2268 | *return_buf = buf; | |
2269 | *return_size = off; | |
2270 | ||
2271 | if (iret < 0) | |
2272 | return -1; | |
2273 | return 0; | |
2274 | } | |
2275 | ||
2276 | int index_pipe(unsigned char *sha1, int fd, const char *type, int write_object) | |
2277 | { | |
2278 | unsigned long size = 4096; | |
2d7320d0 | 2279 | char *buf = xmalloc(size); |
e7332f96 | 2280 | int ret; |
e7332f96 BE |
2281 | |
2282 | if (read_pipe(fd, &buf, &size)) { | |
024510c8 DB |
2283 | free(buf); |
2284 | return -1; | |
2285 | } | |
e7332f96 | 2286 | |
024510c8 | 2287 | if (!type) |
8e440259 | 2288 | type = blob_type; |
024510c8 | 2289 | if (write_object) |
e7332f96 | 2290 | ret = write_sha1_file(buf, size, type, sha1); |
abdc3fc8 RS |
2291 | else |
2292 | ret = hash_sha1_file(buf, size, type, sha1); | |
024510c8 DB |
2293 | free(buf); |
2294 | return ret; | |
2295 | } | |
2296 | ||
edaec3fb | 2297 | int index_fd(unsigned char *sha1, int fd, struct stat *st, int write_object, |
53bca91a | 2298 | enum object_type type, const char *path) |
74400e71 | 2299 | { |
dc49cd76 | 2300 | size_t size = xsize_t(st->st_size); |
3a55602e | 2301 | void *buf = NULL; |
6c510bee | 2302 | int ret, re_allocated = 0; |
74400e71 | 2303 | |
74400e71 | 2304 | if (size) |
c4712e45 | 2305 | buf = xmmap(NULL, size, PROT_READ, MAP_PRIVATE, fd, 0); |
74400e71 | 2306 | close(fd); |
74400e71 | 2307 | |
7672db20 | 2308 | if (!type) |
edaec3fb | 2309 | type = OBJ_BLOB; |
6c510bee LT |
2310 | |
2311 | /* | |
2312 | * Convert blobs to git internal format | |
2313 | */ | |
d0d8e14d | 2314 | if ((type == OBJ_BLOB) && S_ISREG(st->st_mode)) { |
6c510bee | 2315 | unsigned long nsize = size; |
ac78e548 AR |
2316 | char *nbuf = convert_to_git(path, buf, &nsize); |
2317 | if (nbuf) { | |
2318 | munmap(buf, size); | |
6c510bee LT |
2319 | size = nsize; |
2320 | buf = nbuf; | |
2321 | re_allocated = 1; | |
2322 | } | |
2323 | } | |
2324 | ||
7672db20 | 2325 | if (write_object) |
edaec3fb | 2326 | ret = write_sha1_file(buf, size, typename(type), sha1); |
abdc3fc8 | 2327 | else |
edaec3fb | 2328 | ret = hash_sha1_file(buf, size, typename(type), sha1); |
6c510bee LT |
2329 | if (re_allocated) { |
2330 | free(buf); | |
2331 | return ret; | |
2332 | } | |
aac17941 LT |
2333 | if (size) |
2334 | munmap(buf, size); | |
2335 | return ret; | |
74400e71 | 2336 | } |
ec1fcc16 JH |
2337 | |
2338 | int index_path(unsigned char *sha1, const char *path, struct stat *st, int write_object) | |
2339 | { | |
2340 | int fd; | |
2341 | char *target; | |
dc49cd76 | 2342 | size_t len; |
ec1fcc16 JH |
2343 | |
2344 | switch (st->st_mode & S_IFMT) { | |
2345 | case S_IFREG: | |
2346 | fd = open(path, O_RDONLY); | |
2347 | if (fd < 0) | |
2348 | return error("open(\"%s\"): %s", path, | |
2349 | strerror(errno)); | |
53bca91a | 2350 | if (index_fd(sha1, fd, st, write_object, OBJ_BLOB, path) < 0) |
ec1fcc16 JH |
2351 | return error("%s: failed to insert into database", |
2352 | path); | |
2353 | break; | |
2354 | case S_IFLNK: | |
dc49cd76 SP |
2355 | len = xsize_t(st->st_size); |
2356 | target = xmalloc(len + 1); | |
2357 | if (readlink(path, target, len + 1) != st->st_size) { | |
ec1fcc16 JH |
2358 | char *errstr = strerror(errno); |
2359 | free(target); | |
2360 | return error("readlink(\"%s\"): %s", path, | |
2361 | errstr); | |
2362 | } | |
abdc3fc8 | 2363 | if (!write_object) |
dc49cd76 SP |
2364 | hash_sha1_file(target, len, blob_type, sha1); |
2365 | else if (write_sha1_file(target, len, blob_type, sha1)) | |
ec1fcc16 JH |
2366 | return error("%s: failed to insert into database", |
2367 | path); | |
2368 | free(target); | |
2369 | break; | |
f35a6d3b LT |
2370 | case S_IFDIR: |
2371 | return resolve_gitlink_ref(path, "HEAD", sha1); | |
ec1fcc16 JH |
2372 | default: |
2373 | return error("%s: unsupported file type", path); | |
2374 | } | |
2375 | return 0; | |
2376 | } | |
a69e5429 JH |
2377 | |
2378 | int read_pack_header(int fd, struct pack_header *header) | |
2379 | { | |
2380 | char *c = (char*)header; | |
2381 | ssize_t remaining = sizeof(struct pack_header); | |
2382 | do { | |
2383 | ssize_t r = xread(fd, c, remaining); | |
2384 | if (r <= 0) | |
2385 | /* "eof before pack header was fully read" */ | |
2386 | return PH_ERROR_EOF; | |
2387 | remaining -= r; | |
2388 | c += r; | |
2389 | } while (remaining > 0); | |
2390 | if (header->hdr_signature != htonl(PACK_SIGNATURE)) | |
2391 | /* "protocol error (pack signature mismatch detected)" */ | |
2392 | return PH_ERROR_PACK_SIGNATURE; | |
2393 | if (!pack_version_ok(header->hdr_version)) | |
2394 | /* "protocol error (pack version unsupported)" */ | |
2395 | return PH_ERROR_PROTOCOL; | |
2396 | return 0; | |
2397 | } |