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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" |
70f5d5d3 | 17 | #include "pack-revindex.h" |
628522ec | 18 | #include "sha1-lookup.h" |
0fcfd160 | 19 | |
144bde78 LT |
20 | #ifndef O_NOATIME |
21 | #if defined(__linux__) && (defined(__i386__) || defined(__PPC__)) | |
22 | #define O_NOATIME 01000000 | |
23 | #else | |
24 | #define O_NOATIME 0 | |
25 | #endif | |
26 | #endif | |
27 | ||
e05db0fd PR |
28 | #ifdef NO_C99_FORMAT |
29 | #define SZ_FMT "lu" | |
9e42d6a1 | 30 | static unsigned long sz_fmt(size_t s) { return (unsigned long)s; } |
e05db0fd PR |
31 | #else |
32 | #define SZ_FMT "zu" | |
9e42d6a1 | 33 | static size_t sz_fmt(size_t s) { return s; } |
e05db0fd PR |
34 | #endif |
35 | ||
96f1e58f | 36 | const unsigned char null_sha1[20]; |
88cd621d | 37 | |
144bde78 LT |
38 | static unsigned int sha1_file_open_flag = O_NOATIME; |
39 | ||
192a6be2 | 40 | const signed char hexval_table[256] = { |
e49521b5 JH |
41 | -1, -1, -1, -1, -1, -1, -1, -1, /* 00-07 */ |
42 | -1, -1, -1, -1, -1, -1, -1, -1, /* 08-0f */ | |
43 | -1, -1, -1, -1, -1, -1, -1, -1, /* 10-17 */ | |
44 | -1, -1, -1, -1, -1, -1, -1, -1, /* 18-1f */ | |
45 | -1, -1, -1, -1, -1, -1, -1, -1, /* 20-27 */ | |
46 | -1, -1, -1, -1, -1, -1, -1, -1, /* 28-2f */ | |
47 | 0, 1, 2, 3, 4, 5, 6, 7, /* 30-37 */ | |
48 | 8, 9, -1, -1, -1, -1, -1, -1, /* 38-3f */ | |
49 | -1, 10, 11, 12, 13, 14, 15, -1, /* 40-47 */ | |
50 | -1, -1, -1, -1, -1, -1, -1, -1, /* 48-4f */ | |
51 | -1, -1, -1, -1, -1, -1, -1, -1, /* 50-57 */ | |
52 | -1, -1, -1, -1, -1, -1, -1, -1, /* 58-5f */ | |
53 | -1, 10, 11, 12, 13, 14, 15, -1, /* 60-67 */ | |
54 | -1, -1, -1, -1, -1, -1, -1, -1, /* 68-67 */ | |
55 | -1, -1, -1, -1, -1, -1, -1, -1, /* 70-77 */ | |
56 | -1, -1, -1, -1, -1, -1, -1, -1, /* 78-7f */ | |
57 | -1, -1, -1, -1, -1, -1, -1, -1, /* 80-87 */ | |
58 | -1, -1, -1, -1, -1, -1, -1, -1, /* 88-8f */ | |
59 | -1, -1, -1, -1, -1, -1, -1, -1, /* 90-97 */ | |
60 | -1, -1, -1, -1, -1, -1, -1, -1, /* 98-9f */ | |
61 | -1, -1, -1, -1, -1, -1, -1, -1, /* a0-a7 */ | |
62 | -1, -1, -1, -1, -1, -1, -1, -1, /* a8-af */ | |
63 | -1, -1, -1, -1, -1, -1, -1, -1, /* b0-b7 */ | |
64 | -1, -1, -1, -1, -1, -1, -1, -1, /* b8-bf */ | |
65 | -1, -1, -1, -1, -1, -1, -1, -1, /* c0-c7 */ | |
66 | -1, -1, -1, -1, -1, -1, -1, -1, /* c8-cf */ | |
67 | -1, -1, -1, -1, -1, -1, -1, -1, /* d0-d7 */ | |
68 | -1, -1, -1, -1, -1, -1, -1, -1, /* d8-df */ | |
69 | -1, -1, -1, -1, -1, -1, -1, -1, /* e0-e7 */ | |
70 | -1, -1, -1, -1, -1, -1, -1, -1, /* e8-ef */ | |
71 | -1, -1, -1, -1, -1, -1, -1, -1, /* f0-f7 */ | |
72 | -1, -1, -1, -1, -1, -1, -1, -1, /* f8-ff */ | |
73 | }; | |
0fcfd160 LT |
74 | |
75 | int get_sha1_hex(const char *hex, unsigned char *sha1) | |
76 | { | |
77 | int i; | |
78 | for (i = 0; i < 20; i++) { | |
79 | unsigned int val = (hexval(hex[0]) << 4) | hexval(hex[1]); | |
80 | if (val & ~0xff) | |
81 | return -1; | |
82 | *sha1++ = val; | |
83 | hex += 2; | |
84 | } | |
85 | return 0; | |
86 | } | |
87 | ||
b2cb9425 JH |
88 | int safe_create_leading_directories(char *path) |
89 | { | |
90 | char *pos = path; | |
67d42212 JR |
91 | struct stat st; |
92 | ||
85dadc38 | 93 | if (is_absolute_path(path)) |
67ffdf4c | 94 | pos++; |
b2cb9425 JH |
95 | |
96 | while (pos) { | |
97 | pos = strchr(pos, '/'); | |
98 | if (!pos) | |
99 | break; | |
100 | *pos = 0; | |
67d42212 JR |
101 | if (!stat(path, &st)) { |
102 | /* path exists */ | |
103 | if (!S_ISDIR(st.st_mode)) { | |
b2cb9425 | 104 | *pos = '/'; |
67d42212 | 105 | return -3; |
b2cb9425 | 106 | } |
457f06d6 | 107 | } |
67d42212 JR |
108 | else if (mkdir(path, 0777)) { |
109 | *pos = '/'; | |
110 | return -1; | |
111 | } | |
457f06d6 JS |
112 | else if (adjust_shared_perm(path)) { |
113 | *pos = '/'; | |
114 | return -2; | |
115 | } | |
b2cb9425 JH |
116 | *pos++ = '/'; |
117 | } | |
118 | return 0; | |
119 | } | |
723c31fe | 120 | |
0fcfd160 LT |
121 | char * sha1_to_hex(const unsigned char *sha1) |
122 | { | |
dcb3450f LT |
123 | static int bufno; |
124 | static char hexbuffer[4][50]; | |
0fcfd160 | 125 | static const char hex[] = "0123456789abcdef"; |
dcb3450f | 126 | char *buffer = hexbuffer[3 & ++bufno], *buf = buffer; |
0fcfd160 LT |
127 | int i; |
128 | ||
129 | for (i = 0; i < 20; i++) { | |
130 | unsigned int val = *sha1++; | |
131 | *buf++ = hex[val >> 4]; | |
132 | *buf++ = hex[val & 0xf]; | |
133 | } | |
1e80e044 JS |
134 | *buf = '\0'; |
135 | ||
0fcfd160 LT |
136 | return buffer; |
137 | } | |
138 | ||
ace1534d JH |
139 | static void fill_sha1_path(char *pathbuf, const unsigned char *sha1) |
140 | { | |
141 | int i; | |
142 | for (i = 0; i < 20; i++) { | |
143 | static char hex[] = "0123456789abcdef"; | |
144 | unsigned int val = sha1[i]; | |
145 | char *pos = pathbuf + i*2 + (i > 0); | |
146 | *pos++ = hex[val >> 4]; | |
147 | *pos = hex[val & 0xf]; | |
148 | } | |
149 | } | |
150 | ||
0fcfd160 LT |
151 | /* |
152 | * NOTE! This returns a statically allocated buffer, so you have to be | |
790296fd | 153 | * careful about using it. Do an "xstrdup()" if you need to save the |
0fcfd160 | 154 | * filename. |
ace1534d JH |
155 | * |
156 | * Also note that this returns the location for creating. Reading | |
157 | * SHA1 file can happen from any alternate directory listed in the | |
d19938ab | 158 | * DB_ENVIRONMENT environment variable if it is not found in |
ace1534d | 159 | * the primary object database. |
0fcfd160 LT |
160 | */ |
161 | char *sha1_file_name(const unsigned char *sha1) | |
162 | { | |
0fcfd160 LT |
163 | static char *name, *base; |
164 | ||
165 | if (!base) { | |
d19938ab | 166 | const char *sha1_file_directory = get_object_directory(); |
0fcfd160 | 167 | int len = strlen(sha1_file_directory); |
812666c8 | 168 | base = xmalloc(len + 60); |
0fcfd160 LT |
169 | memcpy(base, sha1_file_directory, len); |
170 | memset(base+len, 0, 60); | |
171 | base[len] = '/'; | |
172 | base[len+3] = '/'; | |
173 | name = base + len + 1; | |
174 | } | |
ace1534d | 175 | fill_sha1_path(name, sha1); |
0fcfd160 LT |
176 | return base; |
177 | } | |
178 | ||
bf592c50 DB |
179 | char *sha1_pack_name(const unsigned char *sha1) |
180 | { | |
181 | static const char hex[] = "0123456789abcdef"; | |
182 | static char *name, *base, *buf; | |
183 | int i; | |
184 | ||
185 | if (!base) { | |
186 | const char *sha1_file_directory = get_object_directory(); | |
187 | int len = strlen(sha1_file_directory); | |
188 | base = xmalloc(len + 60); | |
189 | sprintf(base, "%s/pack/pack-1234567890123456789012345678901234567890.pack", sha1_file_directory); | |
190 | name = base + len + 11; | |
191 | } | |
192 | ||
193 | buf = name; | |
194 | ||
195 | for (i = 0; i < 20; i++) { | |
196 | unsigned int val = *sha1++; | |
197 | *buf++ = hex[val >> 4]; | |
198 | *buf++ = hex[val & 0xf]; | |
199 | } | |
a6080a0a | 200 | |
bf592c50 DB |
201 | return base; |
202 | } | |
203 | ||
204 | char *sha1_pack_index_name(const unsigned char *sha1) | |
205 | { | |
206 | static const char hex[] = "0123456789abcdef"; | |
207 | static char *name, *base, *buf; | |
208 | int i; | |
209 | ||
210 | if (!base) { | |
211 | const char *sha1_file_directory = get_object_directory(); | |
212 | int len = strlen(sha1_file_directory); | |
213 | base = xmalloc(len + 60); | |
214 | sprintf(base, "%s/pack/pack-1234567890123456789012345678901234567890.idx", sha1_file_directory); | |
215 | name = base + len + 11; | |
216 | } | |
217 | ||
218 | buf = name; | |
219 | ||
220 | for (i = 0; i < 20; i++) { | |
221 | unsigned int val = *sha1++; | |
222 | *buf++ = hex[val >> 4]; | |
223 | *buf++ = hex[val & 0xf]; | |
224 | } | |
a6080a0a | 225 | |
bf592c50 DB |
226 | return base; |
227 | } | |
228 | ||
d5a63b99 JH |
229 | struct alternate_object_database *alt_odb_list; |
230 | static struct alternate_object_database **alt_odb_tail; | |
ace1534d | 231 | |
c2f493a4 MW |
232 | static void read_info_alternates(const char * alternates, int depth); |
233 | ||
ddd5d056 JH |
234 | /* |
235 | * Prepare alternate object database registry. | |
d5a63b99 JH |
236 | * |
237 | * The variable alt_odb_list points at the list of struct | |
238 | * alternate_object_database. The elements on this list come from | |
239 | * non-empty elements from colon separated ALTERNATE_DB_ENVIRONMENT | |
240 | * environment variable, and $GIT_OBJECT_DIRECTORY/info/alternates, | |
1494e038 JH |
241 | * whose contents is similar to that environment variable but can be |
242 | * LF separated. Its base points at a statically allocated buffer that | |
d5a63b99 JH |
243 | * contains "/the/directory/corresponding/to/.git/objects/...", while |
244 | * its name points just after the slash at the end of ".git/objects/" | |
245 | * in the example above, and has enough space to hold 40-byte hex | |
246 | * SHA1, an extra slash for the first level indirection, and the | |
247 | * terminating NUL. | |
ddd5d056 | 248 | */ |
c2f493a4 | 249 | static int link_alt_odb_entry(const char * entry, int len, const char * relative_base, int depth) |
ace1534d | 250 | { |
c2f493a4 | 251 | struct stat st; |
1494e038 | 252 | const char *objdir = get_object_directory(); |
c2f493a4 MW |
253 | struct alternate_object_database *ent; |
254 | struct alternate_object_database *alt; | |
255 | /* 43 = 40-byte + 2 '/' + terminating NUL */ | |
256 | int pfxlen = len; | |
257 | int entlen = pfxlen + 43; | |
ccfd3e99 | 258 | int base_len = -1; |
d5a63b99 | 259 | |
85dadc38 | 260 | if (!is_absolute_path(entry) && relative_base) { |
c2f493a4 MW |
261 | /* Relative alt-odb */ |
262 | if (base_len < 0) | |
263 | base_len = strlen(relative_base) + 1; | |
264 | entlen += base_len; | |
265 | pfxlen += base_len; | |
266 | } | |
267 | ent = xmalloc(sizeof(*ent) + entlen); | |
268 | ||
85dadc38 | 269 | if (!is_absolute_path(entry) && relative_base) { |
c2f493a4 MW |
270 | memcpy(ent->base, relative_base, base_len - 1); |
271 | ent->base[base_len - 1] = '/'; | |
272 | memcpy(ent->base + base_len, entry, len); | |
273 | } | |
274 | else | |
275 | memcpy(ent->base, entry, pfxlen); | |
276 | ||
277 | ent->name = ent->base + pfxlen + 1; | |
278 | ent->base[pfxlen + 3] = '/'; | |
279 | ent->base[pfxlen] = ent->base[entlen-1] = 0; | |
280 | ||
281 | /* Detect cases where alternate disappeared */ | |
282 | if (stat(ent->base, &st) || !S_ISDIR(st.st_mode)) { | |
283 | error("object directory %s does not exist; " | |
284 | "check .git/objects/info/alternates.", | |
285 | ent->base); | |
286 | free(ent); | |
287 | return -1; | |
288 | } | |
289 | ||
290 | /* Prevent the common mistake of listing the same | |
291 | * thing twice, or object directory itself. | |
292 | */ | |
293 | for (alt = alt_odb_list; alt; alt = alt->next) { | |
294 | if (!memcmp(ent->base, alt->base, pfxlen)) { | |
295 | free(ent); | |
296 | return -1; | |
297 | } | |
298 | } | |
299 | if (!memcmp(ent->base, objdir, pfxlen)) { | |
300 | free(ent); | |
301 | return -1; | |
302 | } | |
303 | ||
304 | /* add the alternate entry */ | |
305 | *alt_odb_tail = ent; | |
306 | alt_odb_tail = &(ent->next); | |
307 | ent->next = NULL; | |
308 | ||
309 | /* recursively add alternates */ | |
310 | read_info_alternates(ent->base, depth + 1); | |
311 | ||
312 | ent->base[pfxlen] = '/'; | |
313 | ||
314 | return 0; | |
315 | } | |
316 | ||
317 | static void link_alt_odb_entries(const char *alt, const char *ep, int sep, | |
318 | const char *relative_base, int depth) | |
319 | { | |
320 | const char *cp, *last; | |
321 | ||
322 | if (depth > 5) { | |
323 | error("%s: ignoring alternate object stores, nesting too deep.", | |
324 | relative_base); | |
325 | return; | |
326 | } | |
327 | ||
d5a63b99 | 328 | last = alt; |
9577e7e3 JH |
329 | while (last < ep) { |
330 | cp = last; | |
331 | if (cp < ep && *cp == '#') { | |
332 | while (cp < ep && *cp != sep) | |
333 | cp++; | |
334 | last = cp + 1; | |
335 | continue; | |
336 | } | |
c2f493a4 MW |
337 | while (cp < ep && *cp != sep) |
338 | cp++; | |
d5a63b99 | 339 | if (last != cp) { |
85dadc38 | 340 | if (!is_absolute_path(last) && depth) { |
c2f493a4 MW |
341 | error("%s: ignoring relative alternate object store %s", |
342 | relative_base, last); | |
343 | } else { | |
344 | link_alt_odb_entry(last, cp - last, | |
345 | relative_base, depth); | |
1494e038 | 346 | } |
d5a63b99 | 347 | } |
9577e7e3 | 348 | while (cp < ep && *cp == sep) |
d5a63b99 JH |
349 | cp++; |
350 | last = cp; | |
9577e7e3 | 351 | } |
d5a63b99 JH |
352 | } |
353 | ||
c2f493a4 | 354 | static void read_info_alternates(const char * relative_base, int depth) |
d5a63b99 | 355 | { |
9577e7e3 | 356 | char *map; |
dc49cd76 | 357 | size_t mapsz; |
d5a63b99 | 358 | struct stat st; |
9cb18f56 JM |
359 | const char alt_file_name[] = "info/alternates"; |
360 | /* Given that relative_base is no longer than PATH_MAX, | |
361 | ensure that "path" has enough space to append "/", the | |
362 | file name, "info/alternates", and a trailing NUL. */ | |
363 | char path[PATH_MAX + 1 + sizeof alt_file_name]; | |
c2f493a4 | 364 | int fd; |
d5a63b99 | 365 | |
9cb18f56 | 366 | sprintf(path, "%s/%s", relative_base, alt_file_name); |
d5a63b99 JH |
367 | fd = open(path, O_RDONLY); |
368 | if (fd < 0) | |
369 | return; | |
370 | if (fstat(fd, &st) || (st.st_size == 0)) { | |
371 | close(fd); | |
9a217f2a | 372 | return; |
ace1534d | 373 | } |
dc49cd76 SP |
374 | mapsz = xsize_t(st.st_size); |
375 | map = xmmap(NULL, mapsz, PROT_READ, MAP_PRIVATE, fd, 0); | |
d5a63b99 | 376 | close(fd); |
d5a63b99 | 377 | |
dc49cd76 | 378 | link_alt_odb_entries(map, map + mapsz, '\n', relative_base, depth); |
c2f493a4 | 379 | |
dc49cd76 | 380 | munmap(map, mapsz); |
ace1534d JH |
381 | } |
382 | ||
c2f493a4 MW |
383 | void prepare_alt_odb(void) |
384 | { | |
554fe20d | 385 | const char *alt; |
c2f493a4 | 386 | |
7dc24aa5 SP |
387 | if (alt_odb_tail) |
388 | return; | |
389 | ||
c2f493a4 MW |
390 | alt = getenv(ALTERNATE_DB_ENVIRONMENT); |
391 | if (!alt) alt = ""; | |
392 | ||
c2f493a4 MW |
393 | alt_odb_tail = &alt_odb_list; |
394 | link_alt_odb_entries(alt, alt + strlen(alt), ':', NULL, 0); | |
395 | ||
396 | read_info_alternates(get_object_directory(), 0); | |
397 | } | |
398 | ||
ace1534d JH |
399 | static char *find_sha1_file(const unsigned char *sha1, struct stat *st) |
400 | { | |
ace1534d | 401 | char *name = sha1_file_name(sha1); |
d5a63b99 | 402 | struct alternate_object_database *alt; |
ace1534d JH |
403 | |
404 | if (!stat(name, st)) | |
405 | return name; | |
9a217f2a | 406 | prepare_alt_odb(); |
d5a63b99 JH |
407 | for (alt = alt_odb_list; alt; alt = alt->next) { |
408 | name = alt->name; | |
ace1534d | 409 | fill_sha1_path(name, sha1); |
d5a63b99 JH |
410 | if (!stat(alt->base, st)) |
411 | return alt->base; | |
ace1534d JH |
412 | } |
413 | return NULL; | |
414 | } | |
415 | ||
60bb8b14 | 416 | static unsigned int pack_used_ctr; |
a53128b6 SP |
417 | static unsigned int pack_mmap_calls; |
418 | static unsigned int peak_pack_open_windows; | |
419 | static unsigned int pack_open_windows; | |
420 | static size_t peak_pack_mapped; | |
60bb8b14 | 421 | static size_t pack_mapped; |
9a217f2a | 422 | struct packed_git *packed_git; |
1f688557 | 423 | |
b79d18c9 | 424 | void pack_report(void) |
a53128b6 SP |
425 | { |
426 | fprintf(stderr, | |
e05db0fd PR |
427 | "pack_report: getpagesize() = %10" SZ_FMT "\n" |
428 | "pack_report: core.packedGitWindowSize = %10" SZ_FMT "\n" | |
429 | "pack_report: core.packedGitLimit = %10" SZ_FMT "\n", | |
9e42d6a1 SP |
430 | sz_fmt(getpagesize()), |
431 | sz_fmt(packed_git_window_size), | |
432 | sz_fmt(packed_git_limit)); | |
a53128b6 SP |
433 | fprintf(stderr, |
434 | "pack_report: pack_used_ctr = %10u\n" | |
435 | "pack_report: pack_mmap_calls = %10u\n" | |
436 | "pack_report: pack_open_windows = %10u / %10u\n" | |
e05db0fd PR |
437 | "pack_report: pack_mapped = " |
438 | "%10" SZ_FMT " / %10" SZ_FMT "\n", | |
a53128b6 SP |
439 | pack_used_ctr, |
440 | pack_mmap_calls, | |
441 | pack_open_windows, peak_pack_open_windows, | |
9e42d6a1 | 442 | sz_fmt(pack_mapped), sz_fmt(peak_pack_mapped)); |
a53128b6 SP |
443 | } |
444 | ||
42873078 | 445 | static int check_packed_git_idx(const char *path, struct packed_git *p) |
1f688557 JH |
446 | { |
447 | void *idx_map; | |
42873078 | 448 | struct pack_idx_header *hdr; |
dc49cd76 | 449 | size_t idx_size; |
74e34e1f | 450 | uint32_t version, nr, i, *index; |
e93ec6f9 | 451 | int fd = open(path, O_RDONLY); |
1f688557 | 452 | struct stat st; |
42873078 | 453 | |
1f688557 JH |
454 | if (fd < 0) |
455 | return -1; | |
456 | if (fstat(fd, &st)) { | |
457 | close(fd); | |
458 | return -1; | |
459 | } | |
dc49cd76 | 460 | idx_size = xsize_t(st.st_size); |
2d88451b SP |
461 | if (idx_size < 4 * 256 + 20 + 20) { |
462 | close(fd); | |
463 | return error("index file %s is too small", path); | |
464 | } | |
c4712e45 | 465 | idx_map = xmmap(NULL, idx_size, PROT_READ, MAP_PRIVATE, fd, 0); |
1f688557 | 466 | close(fd); |
1f688557 | 467 | |
42873078 NP |
468 | hdr = idx_map; |
469 | if (hdr->idx_signature == htonl(PACK_IDX_SIGNATURE)) { | |
74e34e1f NP |
470 | version = ntohl(hdr->idx_version); |
471 | if (version < 2 || version > 2) { | |
472 | munmap(idx_map, idx_size); | |
473 | return error("index file %s is version %d" | |
474 | " and is not supported by this binary" | |
475 | " (try upgrading GIT to a newer version)", | |
476 | path, version); | |
477 | } | |
478 | } else | |
479 | version = 1; | |
df1b059d | 480 | |
1f688557 | 481 | nr = 0; |
42873078 | 482 | index = idx_map; |
74e34e1f NP |
483 | if (version > 1) |
484 | index += 2; /* skip index header */ | |
1f688557 | 485 | for (i = 0; i < 256; i++) { |
326bf396 | 486 | uint32_t n = ntohl(index[i]); |
2d88451b SP |
487 | if (n < nr) { |
488 | munmap(idx_map, idx_size); | |
df1b059d | 489 | return error("non-monotonic index %s", path); |
2d88451b | 490 | } |
1f688557 JH |
491 | nr = n; |
492 | } | |
493 | ||
74e34e1f NP |
494 | if (version == 1) { |
495 | /* | |
496 | * Total size: | |
497 | * - 256 index entries 4 bytes each | |
498 | * - 24-byte entries * nr (20-byte sha1 + 4-byte offset) | |
499 | * - 20-byte SHA1 of the packfile | |
500 | * - 20-byte SHA1 file checksum | |
501 | */ | |
502 | if (idx_size != 4*256 + nr * 24 + 20 + 20) { | |
503 | munmap(idx_map, idx_size); | |
eef427a0 | 504 | return error("wrong index v1 file size in %s", path); |
74e34e1f NP |
505 | } |
506 | } else if (version == 2) { | |
507 | /* | |
508 | * Minimum size: | |
509 | * - 8 bytes of header | |
510 | * - 256 index entries 4 bytes each | |
511 | * - 20-byte sha1 entry * nr | |
512 | * - 4-byte crc entry * nr | |
513 | * - 4-byte offset entry * nr | |
514 | * - 20-byte SHA1 of the packfile | |
515 | * - 20-byte SHA1 file checksum | |
516 | * And after the 4-byte offset table might be a | |
517 | * variable sized table containing 8-byte entries | |
518 | * for offsets larger than 2^31. | |
519 | */ | |
520 | unsigned long min_size = 8 + 4*256 + nr*(20 + 4 + 4) + 20 + 20; | |
1164f1e4 LT |
521 | unsigned long max_size = min_size; |
522 | if (nr) | |
523 | max_size += (nr - 1)*8; | |
524 | if (idx_size < min_size || idx_size > max_size) { | |
74e34e1f | 525 | munmap(idx_map, idx_size); |
eef427a0 | 526 | return error("wrong index v2 file size in %s", path); |
74e34e1f | 527 | } |
7109c889 JH |
528 | if (idx_size != min_size && |
529 | /* | |
530 | * make sure we can deal with large pack offsets. | |
531 | * 31-bit signed offset won't be enough, neither | |
532 | * 32-bit unsigned one will be. | |
533 | */ | |
534 | (sizeof(off_t) <= 4)) { | |
535 | munmap(idx_map, idx_size); | |
536 | return error("pack too large for current definition of off_t in %s", path); | |
74e34e1f | 537 | } |
2d88451b | 538 | } |
1f688557 | 539 | |
74e34e1f | 540 | p->index_version = version; |
42873078 NP |
541 | p->index_data = idx_map; |
542 | p->index_size = idx_size; | |
57059091 | 543 | p->num_objects = nr; |
1f688557 JH |
544 | return 0; |
545 | } | |
546 | ||
bc8e478a | 547 | int open_pack_index(struct packed_git *p) |
d079837e SP |
548 | { |
549 | char *idx_name; | |
550 | int ret; | |
551 | ||
552 | if (p->index_data) | |
553 | return 0; | |
554 | ||
555 | idx_name = xstrdup(p->pack_name); | |
556 | strcpy(idx_name + strlen(idx_name) - strlen(".pack"), ".idx"); | |
557 | ret = check_packed_git_idx(idx_name, p); | |
558 | free(idx_name); | |
559 | return ret; | |
560 | } | |
561 | ||
11daf39b SP |
562 | static void scan_windows(struct packed_git *p, |
563 | struct packed_git **lru_p, | |
564 | struct pack_window **lru_w, | |
565 | struct pack_window **lru_l) | |
1f688557 | 566 | { |
11daf39b SP |
567 | struct pack_window *w, *w_l; |
568 | ||
569 | for (w_l = NULL, w = p->windows; w; w = w->next) { | |
570 | if (!w->inuse_cnt) { | |
571 | if (!*lru_w || w->last_used < (*lru_w)->last_used) { | |
572 | *lru_p = p; | |
573 | *lru_w = w; | |
574 | *lru_l = w_l; | |
54044bf8 | 575 | } |
54044bf8 | 576 | } |
11daf39b | 577 | w_l = w; |
f9253394 | 578 | } |
11daf39b SP |
579 | } |
580 | ||
d1efefa4 | 581 | static int unuse_one_window(struct packed_git *current, int keep_fd) |
11daf39b SP |
582 | { |
583 | struct packed_git *p, *lru_p = NULL; | |
584 | struct pack_window *lru_w = NULL, *lru_l = NULL; | |
585 | ||
586 | if (current) | |
587 | scan_windows(current, &lru_p, &lru_w, &lru_l); | |
588 | for (p = packed_git; p; p = p->next) | |
589 | scan_windows(p, &lru_p, &lru_w, &lru_l); | |
54044bf8 SP |
590 | if (lru_p) { |
591 | munmap(lru_w->base, lru_w->len); | |
592 | pack_mapped -= lru_w->len; | |
593 | if (lru_l) | |
594 | lru_l->next = lru_w->next; | |
595 | else { | |
596 | lru_p->windows = lru_w->next; | |
d1efefa4 | 597 | if (!lru_p->windows && lru_p->pack_fd != keep_fd) { |
54044bf8 SP |
598 | close(lru_p->pack_fd); |
599 | lru_p->pack_fd = -1; | |
600 | } | |
601 | } | |
602 | free(lru_w); | |
a53128b6 | 603 | pack_open_windows--; |
54044bf8 SP |
604 | return 1; |
605 | } | |
606 | return 0; | |
f9253394 JH |
607 | } |
608 | ||
d1efefa4 | 609 | void release_pack_memory(size_t need, int fd) |
97bfeb34 SP |
610 | { |
611 | size_t cur = pack_mapped; | |
d1efefa4 | 612 | while (need >= (cur - pack_mapped) && unuse_one_window(NULL, fd)) |
97bfeb34 SP |
613 | ; /* nothing */ |
614 | } | |
615 | ||
c9ced051 SP |
616 | void close_pack_windows(struct packed_git *p) |
617 | { | |
618 | while (p->windows) { | |
619 | struct pack_window *w = p->windows; | |
620 | ||
621 | if (w->inuse_cnt) | |
622 | die("pack '%s' still has open windows to it", | |
623 | p->pack_name); | |
624 | munmap(w->base, w->len); | |
625 | pack_mapped -= w->len; | |
626 | pack_open_windows--; | |
627 | p->windows = w->next; | |
628 | free(w); | |
629 | } | |
630 | } | |
631 | ||
03e79c88 | 632 | void unuse_pack(struct pack_window **w_cursor) |
f9253394 | 633 | { |
03e79c88 SP |
634 | struct pack_window *w = *w_cursor; |
635 | if (w) { | |
636 | w->inuse_cnt--; | |
637 | *w_cursor = NULL; | |
638 | } | |
1f688557 JH |
639 | } |
640 | ||
3cf8b462 SP |
641 | /* |
642 | * Do not call this directly as this leaks p->pack_fd on error return; | |
643 | * call open_packed_git() instead. | |
644 | */ | |
645 | static int open_packed_git_1(struct packed_git *p) | |
1f688557 | 646 | { |
9bc879c1 SP |
647 | struct stat st; |
648 | struct pack_header hdr; | |
649 | unsigned char sha1[20]; | |
650 | unsigned char *idx_sha1; | |
2c039da8 | 651 | long fd_flag; |
9bc879c1 | 652 | |
d079837e SP |
653 | if (!p->index_data && open_pack_index(p)) |
654 | return error("packfile %s index unavailable", p->pack_name); | |
655 | ||
9bc879c1 SP |
656 | p->pack_fd = open(p->pack_name, O_RDONLY); |
657 | if (p->pack_fd < 0 || fstat(p->pack_fd, &st)) | |
072db278 | 658 | return -1; |
9bc879c1 SP |
659 | |
660 | /* If we created the struct before we had the pack we lack size. */ | |
bf592c50 | 661 | if (!p->pack_size) { |
bf592c50 | 662 | if (!S_ISREG(st.st_mode)) |
072db278 | 663 | return error("packfile %s not a regular file", p->pack_name); |
bf592c50 | 664 | p->pack_size = st.st_size; |
9bc879c1 | 665 | } else if (p->pack_size != st.st_size) |
072db278 | 666 | return error("packfile %s size changed", p->pack_name); |
9bc879c1 | 667 | |
2c039da8 JH |
668 | /* We leave these file descriptors open with sliding mmap; |
669 | * there is no point keeping them open across exec(), though. | |
670 | */ | |
671 | fd_flag = fcntl(p->pack_fd, F_GETFD, 0); | |
672 | if (fd_flag < 0) | |
072db278 | 673 | return error("cannot determine file descriptor flags"); |
2c039da8 JH |
674 | fd_flag |= FD_CLOEXEC; |
675 | if (fcntl(p->pack_fd, F_SETFD, fd_flag) == -1) | |
072db278 | 676 | return error("cannot set FD_CLOEXEC"); |
2c039da8 | 677 | |
9bc879c1 | 678 | /* Verify we recognize this pack file format. */ |
e6e2bd62 | 679 | if (read_in_full(p->pack_fd, &hdr, sizeof(hdr)) != sizeof(hdr)) |
072db278 | 680 | return error("file %s is far too short to be a packfile", p->pack_name); |
9bc879c1 | 681 | if (hdr.hdr_signature != htonl(PACK_SIGNATURE)) |
072db278 | 682 | return error("file %s is not a GIT packfile", p->pack_name); |
9bc879c1 | 683 | if (!pack_version_ok(hdr.hdr_version)) |
072db278 | 684 | return error("packfile %s is version %u and not supported" |
9bc879c1 SP |
685 | " (try upgrading GIT to a newer version)", |
686 | p->pack_name, ntohl(hdr.hdr_version)); | |
687 | ||
688 | /* Verify the pack matches its index. */ | |
57059091 | 689 | if (p->num_objects != ntohl(hdr.hdr_entries)) |
072db278 | 690 | return error("packfile %s claims to have %u objects" |
57059091 NP |
691 | " while index indicates %u objects", |
692 | p->pack_name, ntohl(hdr.hdr_entries), | |
693 | p->num_objects); | |
9bc879c1 | 694 | if (lseek(p->pack_fd, p->pack_size - sizeof(sha1), SEEK_SET) == -1) |
072db278 | 695 | return error("end of packfile %s is unavailable", p->pack_name); |
e6e2bd62 | 696 | if (read_in_full(p->pack_fd, sha1, sizeof(sha1)) != sizeof(sha1)) |
072db278 | 697 | return error("packfile %s signature is unavailable", p->pack_name); |
42873078 | 698 | idx_sha1 = ((unsigned char *)p->index_data) + p->index_size - 40; |
9bc879c1 | 699 | if (hashcmp(sha1, idx_sha1)) |
072db278 SP |
700 | return error("packfile %s does not match index", p->pack_name); |
701 | return 0; | |
9bc879c1 SP |
702 | } |
703 | ||
3cf8b462 SP |
704 | static int open_packed_git(struct packed_git *p) |
705 | { | |
706 | if (!open_packed_git_1(p)) | |
707 | return 0; | |
708 | if (p->pack_fd != -1) { | |
709 | close(p->pack_fd); | |
710 | p->pack_fd = -1; | |
711 | } | |
712 | return -1; | |
713 | } | |
714 | ||
c4001d92 | 715 | static int in_window(struct pack_window *win, off_t offset) |
60bb8b14 SP |
716 | { |
717 | /* We must promise at least 20 bytes (one hash) after the | |
718 | * offset is available from this window, otherwise the offset | |
719 | * is not actually in this window and a different window (which | |
720 | * has that one hash excess) must be used. This is to support | |
721 | * the object header and delta base parsing routines below. | |
722 | */ | |
723 | off_t win_off = win->offset; | |
724 | return win_off <= offset | |
725 | && (offset + 20) <= (win_off + win->len); | |
726 | } | |
727 | ||
03e79c88 SP |
728 | unsigned char* use_pack(struct packed_git *p, |
729 | struct pack_window **w_cursor, | |
c4001d92 | 730 | off_t offset, |
03e79c88 | 731 | unsigned int *left) |
9bc879c1 | 732 | { |
60bb8b14 | 733 | struct pack_window *win = *w_cursor; |
03e79c88 | 734 | |
072db278 SP |
735 | if (p->pack_fd == -1 && open_packed_git(p)) |
736 | die("packfile %s cannot be accessed", p->pack_name); | |
60bb8b14 SP |
737 | |
738 | /* Since packfiles end in a hash of their content and its | |
739 | * pointless to ask for an offset into the middle of that | |
740 | * hash, and the in_window function above wouldn't match | |
741 | * don't allow an offset too close to the end of the file. | |
742 | */ | |
743 | if (offset > (p->pack_size - 20)) | |
744 | die("offset beyond end of packfile (truncated pack?)"); | |
745 | ||
746 | if (!win || !in_window(win, offset)) { | |
747 | if (win) | |
748 | win->inuse_cnt--; | |
749 | for (win = p->windows; win; win = win->next) { | |
750 | if (in_window(win, offset)) | |
751 | break; | |
752 | } | |
753 | if (!win) { | |
78a28df9 | 754 | size_t window_align = packed_git_window_size / 2; |
dc49cd76 | 755 | off_t len; |
60bb8b14 | 756 | win = xcalloc(1, sizeof(*win)); |
78a28df9 | 757 | win->offset = (offset / window_align) * window_align; |
dc49cd76 SP |
758 | len = p->pack_size - win->offset; |
759 | if (len > packed_git_window_size) | |
760 | len = packed_git_window_size; | |
761 | win->len = (size_t)len; | |
60bb8b14 | 762 | pack_mapped += win->len; |
11daf39b | 763 | while (packed_git_limit < pack_mapped |
d1efefa4 | 764 | && unuse_one_window(p, p->pack_fd)) |
60bb8b14 | 765 | ; /* nothing */ |
c4712e45 | 766 | win->base = xmmap(NULL, win->len, |
60bb8b14 SP |
767 | PROT_READ, MAP_PRIVATE, |
768 | p->pack_fd, win->offset); | |
769 | if (win->base == MAP_FAILED) | |
73b4e4be SP |
770 | die("packfile %s cannot be mapped: %s", |
771 | p->pack_name, | |
772 | strerror(errno)); | |
a53128b6 SP |
773 | pack_mmap_calls++; |
774 | pack_open_windows++; | |
775 | if (pack_mapped > peak_pack_mapped) | |
776 | peak_pack_mapped = pack_mapped; | |
777 | if (pack_open_windows > peak_pack_open_windows) | |
778 | peak_pack_open_windows = pack_open_windows; | |
60bb8b14 SP |
779 | win->next = p->windows; |
780 | p->windows = win; | |
781 | } | |
1f688557 | 782 | } |
03e79c88 SP |
783 | if (win != *w_cursor) { |
784 | win->last_used = pack_used_ctr++; | |
785 | win->inuse_cnt++; | |
786 | *w_cursor = win; | |
787 | } | |
60bb8b14 | 788 | offset -= win->offset; |
03e79c88 | 789 | if (left) |
dc49cd76 | 790 | *left = win->len - xsize_t(offset); |
03e79c88 | 791 | return win->base + offset; |
1f688557 JH |
792 | } |
793 | ||
42873078 | 794 | struct packed_git *add_packed_git(const char *path, int path_len, int local) |
1f688557 JH |
795 | { |
796 | struct stat st; | |
42873078 | 797 | struct packed_git *p = xmalloc(sizeof(*p) + path_len + 2); |
1f688557 | 798 | |
42873078 NP |
799 | /* |
800 | * Make sure a corresponding .pack file exists and that | |
801 | * the index looks sane. | |
802 | */ | |
803 | path_len -= strlen(".idx"); | |
804 | if (path_len < 1) | |
1f688557 | 805 | return NULL; |
42873078 NP |
806 | memcpy(p->pack_name, path, path_len); |
807 | strcpy(p->pack_name + path_len, ".pack"); | |
d079837e | 808 | if (stat(p->pack_name, &st) || !S_ISREG(st.st_mode)) { |
42873078 | 809 | free(p); |
1f688557 JH |
810 | return NULL; |
811 | } | |
42873078 | 812 | |
1f688557 JH |
813 | /* ok, it looks sane as far as we can check without |
814 | * actually mapping the pack file. | |
815 | */ | |
d079837e SP |
816 | p->index_version = 0; |
817 | p->index_data = NULL; | |
818 | p->index_size = 0; | |
819 | p->num_objects = 0; | |
1f688557 | 820 | p->pack_size = st.st_size; |
1f688557 | 821 | p->next = NULL; |
c41ee586 | 822 | p->windows = NULL; |
9bc879c1 | 823 | p->pack_fd = -1; |
9d835df2 | 824 | p->pack_local = local; |
b867092f | 825 | p->mtime = st.st_mtime; |
42873078 NP |
826 | if (path_len < 40 || get_sha1_hex(path + path_len - 40, p->sha1)) |
827 | hashclr(p->sha1); | |
1f688557 JH |
828 | return p; |
829 | } | |
830 | ||
bf592c50 | 831 | struct packed_git *parse_pack_index(unsigned char *sha1) |
c508df5e DB |
832 | { |
833 | char *path = sha1_pack_index_name(sha1); | |
834 | return parse_pack_index_file(sha1, path); | |
835 | } | |
836 | ||
42873078 NP |
837 | struct packed_git *parse_pack_index_file(const unsigned char *sha1, |
838 | const char *idx_path) | |
bf592c50 | 839 | { |
42873078 NP |
840 | const char *path = sha1_pack_name(sha1); |
841 | struct packed_git *p = xmalloc(sizeof(*p) + strlen(path) + 2); | |
bf592c50 | 842 | |
42873078 NP |
843 | if (check_packed_git_idx(idx_path, p)) { |
844 | free(p); | |
bf592c50 | 845 | return NULL; |
42873078 | 846 | } |
bf592c50 | 847 | |
bf592c50 | 848 | strcpy(p->pack_name, path); |
bf592c50 | 849 | p->pack_size = 0; |
bf592c50 | 850 | p->next = NULL; |
c41ee586 | 851 | p->windows = NULL; |
9bc879c1 | 852 | p->pack_fd = -1; |
e702496e | 853 | hashcpy(p->sha1, sha1); |
bf592c50 DB |
854 | return p; |
855 | } | |
856 | ||
857 | void install_packed_git(struct packed_git *pack) | |
858 | { | |
859 | pack->next = packed_git; | |
860 | packed_git = pack; | |
861 | } | |
862 | ||
9d835df2 | 863 | static void prepare_packed_git_one(char *objdir, int local) |
1f688557 | 864 | { |
9cb18f56 JM |
865 | /* Ensure that this buffer is large enough so that we can |
866 | append "/pack/" without clobbering the stack even if | |
867 | strlen(objdir) were PATH_MAX. */ | |
868 | char path[PATH_MAX + 1 + 4 + 1 + 1]; | |
1f688557 JH |
869 | int len; |
870 | DIR *dir; | |
871 | struct dirent *de; | |
872 | ||
873 | sprintf(path, "%s/pack", objdir); | |
874 | len = strlen(path); | |
875 | dir = opendir(path); | |
b5b16990 | 876 | if (!dir) { |
26125f6b | 877 | if (errno != ENOENT) |
bd2afde8 | 878 | error("unable to open object pack directory: %s: %s", |
26125f6b | 879 | path, strerror(errno)); |
1f688557 | 880 | return; |
b5b16990 | 881 | } |
1f688557 JH |
882 | path[len++] = '/'; |
883 | while ((de = readdir(dir)) != NULL) { | |
884 | int namelen = strlen(de->d_name); | |
885 | struct packed_git *p; | |
886 | ||
5bb1cda5 | 887 | if (!has_extension(de->d_name, ".idx")) |
1f688557 JH |
888 | continue; |
889 | ||
9cb18f56 JM |
890 | if (len + namelen + 1 > sizeof(path)) |
891 | continue; | |
892 | ||
54a15a8d | 893 | /* Don't reopen a pack we already have. */ |
1f688557 | 894 | strcpy(path + len, de->d_name); |
86f7780c JK |
895 | for (p = packed_git; p; p = p->next) { |
896 | if (!memcmp(path, p->pack_name, len + namelen - 4)) | |
897 | break; | |
898 | } | |
899 | if (p) | |
900 | continue; | |
54a15a8d SP |
901 | /* See if it really is a valid .idx file with corresponding |
902 | * .pack file that we can map. | |
903 | */ | |
9d835df2 | 904 | p = add_packed_git(path, len + namelen, local); |
1f688557 JH |
905 | if (!p) |
906 | continue; | |
625e9421 | 907 | install_packed_git(p); |
1f688557 | 908 | } |
5b35bcd5 | 909 | closedir(dir); |
1f688557 JH |
910 | } |
911 | ||
b867092f JH |
912 | static int sort_pack(const void *a_, const void *b_) |
913 | { | |
914 | struct packed_git *a = *((struct packed_git **)a_); | |
915 | struct packed_git *b = *((struct packed_git **)b_); | |
916 | int st; | |
917 | ||
918 | /* | |
919 | * Local packs tend to contain objects specific to our | |
920 | * variant of the project than remote ones. In addition, | |
921 | * remote ones could be on a network mounted filesystem. | |
922 | * Favor local ones for these reasons. | |
923 | */ | |
924 | st = a->pack_local - b->pack_local; | |
925 | if (st) | |
926 | return -st; | |
927 | ||
928 | /* | |
929 | * Younger packs tend to contain more recent objects, | |
930 | * and more recent objects tend to get accessed more | |
931 | * often. | |
932 | */ | |
933 | if (a->mtime < b->mtime) | |
934 | return 1; | |
935 | else if (a->mtime == b->mtime) | |
936 | return 0; | |
937 | return -1; | |
938 | } | |
939 | ||
940 | static void rearrange_packed_git(void) | |
941 | { | |
942 | struct packed_git **ary, *p; | |
943 | int i, n; | |
944 | ||
945 | for (n = 0, p = packed_git; p; p = p->next) | |
946 | n++; | |
947 | if (n < 2) | |
948 | return; | |
949 | ||
950 | /* prepare an array of packed_git for easier sorting */ | |
951 | ary = xcalloc(n, sizeof(struct packed_git *)); | |
952 | for (n = 0, p = packed_git; p; p = p->next) | |
953 | ary[n++] = p; | |
954 | ||
955 | qsort(ary, n, sizeof(struct packed_git *), sort_pack); | |
956 | ||
957 | /* link them back again */ | |
958 | for (i = 0; i < n - 1; i++) | |
959 | ary[i]->next = ary[i + 1]; | |
960 | ary[n - 1]->next = NULL; | |
961 | packed_git = ary[0]; | |
962 | ||
963 | free(ary); | |
964 | } | |
965 | ||
637cdd9d | 966 | static int prepare_packed_git_run_once = 0; |
9a217f2a | 967 | void prepare_packed_git(void) |
1f688557 | 968 | { |
d5a63b99 | 969 | struct alternate_object_database *alt; |
1f688557 | 970 | |
637cdd9d | 971 | if (prepare_packed_git_run_once) |
1f688557 | 972 | return; |
9d835df2 | 973 | prepare_packed_git_one(get_object_directory(), 1); |
9a217f2a | 974 | prepare_alt_odb(); |
d5a63b99 | 975 | for (alt = alt_odb_list; alt; alt = alt->next) { |
1494e038 | 976 | alt->name[-1] = 0; |
9d835df2 | 977 | prepare_packed_git_one(alt->base, 0); |
1494e038 | 978 | alt->name[-1] = '/'; |
1f688557 | 979 | } |
b867092f | 980 | rearrange_packed_git(); |
637cdd9d JK |
981 | prepare_packed_git_run_once = 1; |
982 | } | |
983 | ||
fc04c412 | 984 | void reprepare_packed_git(void) |
637cdd9d JK |
985 | { |
986 | prepare_packed_git_run_once = 0; | |
987 | prepare_packed_git(); | |
1f688557 JH |
988 | } |
989 | ||
5d6ccf5c | 990 | int check_sha1_signature(const unsigned char *sha1, void *map, unsigned long size, const char *type) |
0fcfd160 LT |
991 | { |
992 | unsigned char real_sha1[20]; | |
7cfb5f36 | 993 | hash_sha1_file(map, size, type, real_sha1); |
a89fccd2 | 994 | return hashcmp(sha1, real_sha1) ? -1 : 0; |
0fcfd160 LT |
995 | } |
996 | ||
4175e9e3 | 997 | static void *map_sha1_file(const unsigned char *sha1, unsigned long *size) |
0fcfd160 | 998 | { |
0fcfd160 LT |
999 | struct stat st; |
1000 | void *map; | |
144bde78 | 1001 | int fd; |
ace1534d JH |
1002 | char *filename = find_sha1_file(sha1, &st); |
1003 | ||
1004 | if (!filename) { | |
ace1534d JH |
1005 | return NULL; |
1006 | } | |
0fcfd160 | 1007 | |
144bde78 | 1008 | fd = open(filename, O_RDONLY | sha1_file_open_flag); |
0fcfd160 | 1009 | if (fd < 0) { |
144bde78 LT |
1010 | /* See if it works without O_NOATIME */ |
1011 | switch (sha1_file_open_flag) { | |
1012 | default: | |
1013 | fd = open(filename, O_RDONLY); | |
1014 | if (fd >= 0) | |
1015 | break; | |
1016 | /* Fallthrough */ | |
1017 | case 0: | |
144bde78 LT |
1018 | return NULL; |
1019 | } | |
1020 | ||
1f688557 JH |
1021 | /* If it failed once, it will probably fail again. |
1022 | * Stop using O_NOATIME | |
1023 | */ | |
144bde78 | 1024 | sha1_file_open_flag = 0; |
0fcfd160 | 1025 | } |
dc49cd76 SP |
1026 | *size = xsize_t(st.st_size); |
1027 | map = xmmap(NULL, *size, PROT_READ, MAP_PRIVATE, fd, 0); | |
0fcfd160 | 1028 | close(fd); |
0fcfd160 LT |
1029 | return map; |
1030 | } | |
1031 | ||
726f852b | 1032 | static int legacy_loose_object(unsigned char *map) |
bb6b8e4f JH |
1033 | { |
1034 | unsigned int word; | |
1035 | ||
1036 | /* | |
1037 | * Is it a zlib-compressed buffer? If so, the first byte | |
1038 | * must be 0x78 (15-bit window size, deflated), and the | |
1039 | * first 16-bit word is evenly divisible by 31 | |
1040 | */ | |
1041 | word = (map[0] << 8) + map[1]; | |
1042 | if (map[0] == 0x78 && !(word % 31)) | |
1043 | return 1; | |
1044 | else | |
1045 | return 0; | |
1046 | } | |
1047 | ||
72518e9c | 1048 | unsigned long unpack_object_header_gently(const unsigned char *buf, unsigned long len, enum object_type *type, unsigned long *sizep) |
c4483576 | 1049 | { |
ad1ed5ee | 1050 | unsigned shift; |
93821bd9 | 1051 | unsigned char c; |
93821bd9 | 1052 | unsigned long size; |
ad1ed5ee JH |
1053 | unsigned long used = 0; |
1054 | ||
1055 | c = buf[used++]; | |
1056 | *type = (c >> 4) & 7; | |
1057 | size = c & 15; | |
1058 | shift = 4; | |
1059 | while (c & 0x80) { | |
1060 | if (len <= used) | |
1061 | return 0; | |
1062 | if (sizeof(long) * 8 <= shift) | |
1063 | return 0; | |
1064 | c = buf[used++]; | |
1065 | size += (c & 0x7f) << shift; | |
1066 | shift += 7; | |
1067 | } | |
1068 | *sizep = size; | |
1069 | return used; | |
1070 | } | |
1071 | ||
1072 | static int unpack_sha1_header(z_stream *stream, unsigned char *map, unsigned long mapsize, void *buffer, unsigned long bufsiz) | |
1073 | { | |
1074 | unsigned long size, used; | |
1075 | static const char valid_loose_object_type[8] = { | |
1076 | 0, /* OBJ_EXT */ | |
1077 | 1, 1, 1, 1, /* "commit", "tree", "blob", "tag" */ | |
1078 | 0, /* "delta" and others are invalid in a loose object */ | |
93821bd9 | 1079 | }; |
ad1ed5ee | 1080 | enum object_type type; |
93821bd9 | 1081 | |
c4483576 LT |
1082 | /* Get the data stream */ |
1083 | memset(stream, 0, sizeof(*stream)); | |
1084 | stream->next_in = map; | |
1085 | stream->avail_in = mapsize; | |
1086 | stream->next_out = buffer; | |
93821bd9 LT |
1087 | stream->avail_out = bufsiz; |
1088 | ||
bb6b8e4f | 1089 | if (legacy_loose_object(map)) { |
93821bd9 LT |
1090 | inflateInit(stream); |
1091 | return inflate(stream, 0); | |
1092 | } | |
1093 | ||
726f852b NP |
1094 | |
1095 | /* | |
1096 | * There used to be a second loose object header format which | |
1097 | * was meant to mimic the in-pack format, allowing for direct | |
1098 | * copy of the object data. This format turned up not to be | |
1099 | * really worth it and we don't write it any longer. But we | |
1100 | * can still read it. | |
1101 | */ | |
ad1ed5ee JH |
1102 | used = unpack_object_header_gently(map, mapsize, &type, &size); |
1103 | if (!used || !valid_loose_object_type[type]) | |
93821bd9 | 1104 | return -1; |
ad1ed5ee JH |
1105 | map += used; |
1106 | mapsize -= used; | |
93821bd9 LT |
1107 | |
1108 | /* Set up the stream for the rest.. */ | |
1109 | stream->next_in = map; | |
1110 | stream->avail_in = mapsize; | |
c4483576 | 1111 | inflateInit(stream); |
93821bd9 LT |
1112 | |
1113 | /* And generate the fake traditional header */ | |
ad1ed5ee | 1114 | stream->total_out = 1 + snprintf(buffer, bufsiz, "%s %lu", |
df843662 | 1115 | typename(type), size); |
93821bd9 | 1116 | return 0; |
c4483576 LT |
1117 | } |
1118 | ||
7efbff75 | 1119 | static void *unpack_sha1_rest(z_stream *stream, void *buffer, unsigned long size, const unsigned char *sha1) |
5180cacc LT |
1120 | { |
1121 | int bytes = strlen(buffer) + 1; | |
d565b341 | 1122 | unsigned char *buf = xmalloc(1+size); |
93821bd9 | 1123 | unsigned long n; |
7efbff75 | 1124 | int status = Z_OK; |
5180cacc | 1125 | |
93821bd9 LT |
1126 | n = stream->total_out - bytes; |
1127 | if (n > size) | |
1128 | n = size; | |
1129 | memcpy(buf, (char *) buffer + bytes, n); | |
1130 | bytes = n; | |
456cdf6e LT |
1131 | if (bytes <= size) { |
1132 | /* | |
1133 | * The above condition must be (bytes <= size), not | |
1134 | * (bytes < size). In other words, even though we | |
1135 | * expect no more output and set avail_out to zer0, | |
1136 | * the input zlib stream may have bytes that express | |
1137 | * "this concludes the stream", and we *do* want to | |
1138 | * eat that input. | |
1139 | * | |
1140 | * Otherwise we would not be able to test that we | |
1141 | * consumed all the input to reach the expected size; | |
1142 | * we also want to check that zlib tells us that all | |
1143 | * went well with status == Z_STREAM_END at the end. | |
1144 | */ | |
5180cacc LT |
1145 | stream->next_out = buf + bytes; |
1146 | stream->avail_out = size - bytes; | |
7efbff75 JH |
1147 | while (status == Z_OK) |
1148 | status = inflate(stream, Z_FINISH); | |
5180cacc LT |
1149 | } |
1150 | buf[size] = 0; | |
456cdf6e | 1151 | if (status == Z_STREAM_END && !stream->avail_in) { |
7efbff75 JH |
1152 | inflateEnd(stream); |
1153 | return buf; | |
1154 | } | |
1155 | ||
1156 | if (status < 0) | |
1157 | error("corrupt loose object '%s'", sha1_to_hex(sha1)); | |
1158 | else if (stream->avail_in) | |
1159 | error("garbage at end of loose object '%s'", | |
1160 | sha1_to_hex(sha1)); | |
1161 | free(buf); | |
1162 | return NULL; | |
5180cacc LT |
1163 | } |
1164 | ||
1165 | /* | |
1166 | * We used to just use "sscanf()", but that's actually way | |
1167 | * too permissive for what we want to check. So do an anal | |
1168 | * object header parse by hand. | |
1169 | */ | |
21666f1a | 1170 | static int parse_sha1_header(const char *hdr, unsigned long *sizep) |
5180cacc | 1171 | { |
21666f1a | 1172 | char type[10]; |
5180cacc LT |
1173 | int i; |
1174 | unsigned long size; | |
1175 | ||
1176 | /* | |
a6080a0a | 1177 | * The type can be at most ten bytes (including the |
5180cacc | 1178 | * terminating '\0' that we add), and is followed by |
21666f1a | 1179 | * a space. |
5180cacc | 1180 | */ |
21666f1a | 1181 | i = 0; |
5180cacc LT |
1182 | for (;;) { |
1183 | char c = *hdr++; | |
1184 | if (c == ' ') | |
1185 | break; | |
21666f1a NP |
1186 | type[i++] = c; |
1187 | if (i >= sizeof(type)) | |
5180cacc | 1188 | return -1; |
5180cacc | 1189 | } |
21666f1a | 1190 | type[i] = 0; |
5180cacc LT |
1191 | |
1192 | /* | |
1193 | * The length must follow immediately, and be in canonical | |
1194 | * decimal format (ie "010" is not valid). | |
1195 | */ | |
1196 | size = *hdr++ - '0'; | |
1197 | if (size > 9) | |
1198 | return -1; | |
1199 | if (size) { | |
1200 | for (;;) { | |
1201 | unsigned long c = *hdr - '0'; | |
1202 | if (c > 9) | |
1203 | break; | |
1204 | hdr++; | |
1205 | size = size * 10 + c; | |
1206 | } | |
1207 | } | |
1208 | *sizep = size; | |
1209 | ||
1210 | /* | |
1211 | * The length must be followed by a zero byte | |
1212 | */ | |
21666f1a | 1213 | return *hdr ? -1 : type_from_string(type); |
5180cacc LT |
1214 | } |
1215 | ||
7efbff75 | 1216 | static void *unpack_sha1_file(void *map, unsigned long mapsize, enum object_type *type, unsigned long *size, const unsigned char *sha1) |
0fcfd160 | 1217 | { |
5180cacc | 1218 | int ret; |
0fcfd160 | 1219 | z_stream stream; |
5180cacc | 1220 | char hdr[8192]; |
0fcfd160 | 1221 | |
5180cacc | 1222 | ret = unpack_sha1_header(&stream, map, mapsize, hdr, sizeof(hdr)); |
21666f1a | 1223 | if (ret < Z_OK || (*type = parse_sha1_header(hdr, size)) < 0) |
0fcfd160 LT |
1224 | return NULL; |
1225 | ||
7efbff75 | 1226 | return unpack_sha1_rest(&stream, hdr, *size, sha1); |
0fcfd160 LT |
1227 | } |
1228 | ||
54dab52a NP |
1229 | unsigned long get_size_from_delta(struct packed_git *p, |
1230 | struct pack_window **w_curs, | |
1231 | off_t curpos) | |
1232 | { | |
1233 | const unsigned char *data; | |
1234 | unsigned char delta_head[20], *in; | |
1235 | z_stream stream; | |
1236 | int st; | |
1237 | ||
1238 | memset(&stream, 0, sizeof(stream)); | |
1239 | stream.next_out = delta_head; | |
1240 | stream.avail_out = sizeof(delta_head); | |
1241 | ||
1242 | inflateInit(&stream); | |
1243 | do { | |
1244 | in = use_pack(p, w_curs, curpos, &stream.avail_in); | |
1245 | stream.next_in = in; | |
1246 | st = inflate(&stream, Z_FINISH); | |
1247 | curpos += stream.next_in - in; | |
1248 | } while ((st == Z_OK || st == Z_BUF_ERROR) && | |
1249 | stream.total_out < sizeof(delta_head)); | |
1250 | inflateEnd(&stream); | |
1251 | if ((st != Z_STREAM_END) && stream.total_out != sizeof(delta_head)) | |
1252 | die("delta data unpack-initial failed"); | |
1253 | ||
1254 | /* Examine the initial part of the delta to figure out | |
1255 | * the result size. | |
1256 | */ | |
1257 | data = delta_head; | |
1258 | ||
1259 | /* ignore base size */ | |
1260 | get_delta_hdr_size(&data, delta_head+sizeof(delta_head)); | |
1261 | ||
1262 | /* Read the result size */ | |
1263 | return get_delta_hdr_size(&data, delta_head+sizeof(delta_head)); | |
1264 | } | |
1265 | ||
c4001d92 | 1266 | static off_t get_delta_base(struct packed_git *p, |
03e79c88 | 1267 | struct pack_window **w_curs, |
c4001d92 | 1268 | off_t *curpos, |
21666f1a | 1269 | enum object_type type, |
c4001d92 | 1270 | off_t delta_obj_offset) |
eb32d236 | 1271 | { |
2b87c45b | 1272 | unsigned char *base_info = use_pack(p, w_curs, *curpos, NULL); |
c4001d92 | 1273 | off_t base_offset; |
eb32d236 | 1274 | |
8d8a4ea5 SP |
1275 | /* use_pack() assured us we have [base_info, base_info + 20) |
1276 | * as a range that we can look at without walking off the | |
1277 | * end of the mapped window. Its actually the hash size | |
1278 | * that is assured. An OFS_DELTA longer than the hash size | |
1279 | * is stupid, as then a REF_DELTA would be smaller to store. | |
1280 | */ | |
21666f1a | 1281 | if (type == OBJ_OFS_DELTA) { |
eb32d236 NP |
1282 | unsigned used = 0; |
1283 | unsigned char c = base_info[used++]; | |
1284 | base_offset = c & 127; | |
1285 | while (c & 128) { | |
1286 | base_offset += 1; | |
8723f216 | 1287 | if (!base_offset || MSB(base_offset, 7)) |
eb32d236 NP |
1288 | die("offset value overflow for delta base object"); |
1289 | c = base_info[used++]; | |
1290 | base_offset = (base_offset << 7) + (c & 127); | |
1291 | } | |
1292 | base_offset = delta_obj_offset - base_offset; | |
1293 | if (base_offset >= delta_obj_offset) | |
1294 | die("delta base offset out of bound"); | |
2b87c45b | 1295 | *curpos += used; |
21666f1a | 1296 | } else if (type == OBJ_REF_DELTA) { |
eb32d236 NP |
1297 | /* The base entry _must_ be in the same pack */ |
1298 | base_offset = find_pack_entry_one(base_info, p); | |
1299 | if (!base_offset) | |
1300 | die("failed to find delta-pack base object %s", | |
1301 | sha1_to_hex(base_info)); | |
2b87c45b | 1302 | *curpos += 20; |
eb32d236 NP |
1303 | } else |
1304 | die("I am totally screwed"); | |
2b87c45b | 1305 | return base_offset; |
eb32d236 NP |
1306 | } |
1307 | ||
f3bf9224 | 1308 | /* forward declaration for a mutually recursive function */ |
c4001d92 | 1309 | static int packed_object_info(struct packed_git *p, off_t offset, |
21666f1a | 1310 | unsigned long *sizep); |
f3bf9224 | 1311 | |
43057304 | 1312 | static int packed_delta_info(struct packed_git *p, |
03e79c88 | 1313 | struct pack_window **w_curs, |
c4001d92 | 1314 | off_t curpos, |
21666f1a | 1315 | enum object_type type, |
c4001d92 | 1316 | off_t obj_offset, |
43057304 | 1317 | unsigned long *sizep) |
5db47c2b | 1318 | { |
c4001d92 | 1319 | off_t base_offset; |
f3bf9224 | 1320 | |
21666f1a NP |
1321 | base_offset = get_delta_base(p, w_curs, &curpos, type, obj_offset); |
1322 | type = packed_object_info(p, base_offset, NULL); | |
f3bf9224 | 1323 | |
c62266f3 JH |
1324 | /* We choose to only get the type of the base object and |
1325 | * ignore potentially corrupt pack file that expects the delta | |
1326 | * based on a base with a wrong size. This saves tons of | |
1327 | * inflate() calls. | |
1328 | */ | |
54dab52a NP |
1329 | if (sizep) |
1330 | *sizep = get_size_from_delta(p, w_curs, curpos); | |
21666f1a NP |
1331 | |
1332 | return type; | |
5db47c2b JH |
1333 | } |
1334 | ||
2b87c45b NP |
1335 | static int unpack_object_header(struct packed_git *p, |
1336 | struct pack_window **w_curs, | |
c4001d92 | 1337 | off_t *curpos, |
2b87c45b | 1338 | unsigned long *sizep) |
a733cb60 | 1339 | { |
03e79c88 SP |
1340 | unsigned char *base; |
1341 | unsigned int left; | |
ad1ed5ee | 1342 | unsigned long used; |
2b87c45b | 1343 | enum object_type type; |
a733cb60 | 1344 | |
8d8a4ea5 SP |
1345 | /* use_pack() assures us we have [base, base + 20) available |
1346 | * as a range that we can look at at. (Its actually the hash | |
3dff5379 | 1347 | * size that is assured.) With our object header encoding |
8d8a4ea5 SP |
1348 | * the maximum deflated object size is 2^137, which is just |
1349 | * insane, so we know won't exceed what we have been given. | |
1350 | */ | |
2b87c45b NP |
1351 | base = use_pack(p, w_curs, *curpos, &left); |
1352 | used = unpack_object_header_gently(base, left, &type, sizep); | |
ad1ed5ee JH |
1353 | if (!used) |
1354 | die("object offset outside of pack file"); | |
2b87c45b | 1355 | *curpos += used; |
ad1ed5ee | 1356 | |
2b87c45b | 1357 | return type; |
a733cb60 LT |
1358 | } |
1359 | ||
21666f1a | 1360 | const char *packed_object_info_detail(struct packed_git *p, |
c4001d92 | 1361 | off_t obj_offset, |
21666f1a NP |
1362 | unsigned long *size, |
1363 | unsigned long *store_size, | |
1364 | unsigned int *delta_chain_length, | |
1365 | unsigned char *base_sha1) | |
ad8c80a5 | 1366 | { |
03e79c88 | 1367 | struct pack_window *w_curs = NULL; |
c4001d92 SP |
1368 | off_t curpos; |
1369 | unsigned long dummy; | |
43057304 | 1370 | unsigned char *next_sha1; |
21666f1a | 1371 | enum object_type type; |
70f5d5d3 | 1372 | struct revindex_entry *revidx; |
ad8c80a5 | 1373 | |
43057304 | 1374 | *delta_chain_length = 0; |
2b87c45b | 1375 | curpos = obj_offset; |
21666f1a | 1376 | type = unpack_object_header(p, &w_curs, &curpos, size); |
43057304 | 1377 | |
70f5d5d3 NP |
1378 | revidx = find_pack_revindex(p, obj_offset); |
1379 | *store_size = revidx[1].offset - obj_offset; | |
1380 | ||
43057304 | 1381 | for (;;) { |
21666f1a | 1382 | switch (type) { |
43057304 | 1383 | default: |
08a19d87 | 1384 | die("pack %s contains unknown object type %d", |
21666f1a | 1385 | p->pack_name, type); |
43057304 NP |
1386 | case OBJ_COMMIT: |
1387 | case OBJ_TREE: | |
1388 | case OBJ_BLOB: | |
1389 | case OBJ_TAG: | |
03e79c88 | 1390 | unuse_pack(&w_curs); |
21666f1a | 1391 | return typename(type); |
eb32d236 | 1392 | case OBJ_OFS_DELTA: |
21666f1a | 1393 | obj_offset = get_delta_base(p, &w_curs, &curpos, type, obj_offset); |
eb32d236 | 1394 | if (*delta_chain_length == 0) { |
70f5d5d3 NP |
1395 | revidx = find_pack_revindex(p, obj_offset); |
1396 | hashcpy(base_sha1, nth_packed_object_sha1(p, revidx->nr)); | |
eb32d236 NP |
1397 | } |
1398 | break; | |
1399 | case OBJ_REF_DELTA: | |
2b87c45b | 1400 | next_sha1 = use_pack(p, &w_curs, curpos, NULL); |
43057304 NP |
1401 | if (*delta_chain_length == 0) |
1402 | hashcpy(base_sha1, next_sha1); | |
2b87c45b | 1403 | obj_offset = find_pack_entry_one(next_sha1, p); |
43057304 NP |
1404 | break; |
1405 | } | |
43057304 | 1406 | (*delta_chain_length)++; |
2b87c45b | 1407 | curpos = obj_offset; |
21666f1a | 1408 | type = unpack_object_header(p, &w_curs, &curpos, &dummy); |
ad8c80a5 | 1409 | } |
ad8c80a5 JH |
1410 | } |
1411 | ||
c4001d92 | 1412 | static int packed_object_info(struct packed_git *p, off_t obj_offset, |
21666f1a | 1413 | unsigned long *sizep) |
1f688557 | 1414 | { |
03e79c88 | 1415 | struct pack_window *w_curs = NULL; |
c4001d92 SP |
1416 | unsigned long size; |
1417 | off_t curpos = obj_offset; | |
21666f1a | 1418 | enum object_type type; |
5db47c2b | 1419 | |
21666f1a | 1420 | type = unpack_object_header(p, &w_curs, &curpos, &size); |
5db47c2b | 1421 | |
21666f1a | 1422 | switch (type) { |
eb32d236 NP |
1423 | case OBJ_OFS_DELTA: |
1424 | case OBJ_REF_DELTA: | |
21666f1a NP |
1425 | type = packed_delta_info(p, &w_curs, curpos, |
1426 | type, obj_offset, sizep); | |
2b87c45b | 1427 | break; |
a733cb60 | 1428 | case OBJ_COMMIT: |
a733cb60 | 1429 | case OBJ_TREE: |
a733cb60 | 1430 | case OBJ_BLOB: |
a733cb60 | 1431 | case OBJ_TAG: |
2b87c45b NP |
1432 | if (sizep) |
1433 | *sizep = size; | |
a69d0943 | 1434 | break; |
1f688557 | 1435 | default: |
08a19d87 | 1436 | die("pack %s contains unknown object type %d", |
21666f1a | 1437 | p->pack_name, type); |
1f688557 | 1438 | } |
2b87c45b | 1439 | unuse_pack(&w_curs); |
21666f1a | 1440 | return type; |
1f688557 JH |
1441 | } |
1442 | ||
eb950c19 | 1443 | static void *unpack_compressed_entry(struct packed_git *p, |
03e79c88 | 1444 | struct pack_window **w_curs, |
c4001d92 | 1445 | off_t curpos, |
eb950c19 | 1446 | unsigned long size) |
de530aaa SP |
1447 | { |
1448 | int st; | |
1449 | z_stream stream; | |
079afb18 | 1450 | unsigned char *buffer, *in; |
de530aaa SP |
1451 | |
1452 | buffer = xmalloc(size + 1); | |
1453 | buffer[size] = 0; | |
1454 | memset(&stream, 0, sizeof(stream)); | |
de530aaa SP |
1455 | stream.next_out = buffer; |
1456 | stream.avail_out = size; | |
1457 | ||
1458 | inflateInit(&stream); | |
079afb18 | 1459 | do { |
2b87c45b | 1460 | in = use_pack(p, w_curs, curpos, &stream.avail_in); |
079afb18 SP |
1461 | stream.next_in = in; |
1462 | st = inflate(&stream, Z_FINISH); | |
2b87c45b | 1463 | curpos += stream.next_in - in; |
079afb18 | 1464 | } while (st == Z_OK || st == Z_BUF_ERROR); |
de530aaa SP |
1465 | inflateEnd(&stream); |
1466 | if ((st != Z_STREAM_END) || stream.total_out != size) { | |
1467 | free(buffer); | |
1468 | return NULL; | |
1469 | } | |
1470 | ||
1471 | return buffer; | |
1472 | } | |
1473 | ||
e5e01619 LT |
1474 | #define MAX_DELTA_CACHE (256) |
1475 | ||
18bdec11 | 1476 | static size_t delta_base_cached; |
5e08ecbf NP |
1477 | |
1478 | static struct delta_base_cache_lru_list { | |
1479 | struct delta_base_cache_lru_list *prev; | |
1480 | struct delta_base_cache_lru_list *next; | |
1481 | } delta_base_cache_lru = { &delta_base_cache_lru, &delta_base_cache_lru }; | |
1482 | ||
e5e01619 | 1483 | static struct delta_base_cache_entry { |
5e08ecbf NP |
1484 | struct delta_base_cache_lru_list lru; |
1485 | void *data; | |
e5e01619 LT |
1486 | struct packed_git *p; |
1487 | off_t base_offset; | |
1488 | unsigned long size; | |
e5e01619 LT |
1489 | enum object_type type; |
1490 | } delta_base_cache[MAX_DELTA_CACHE]; | |
1491 | ||
1492 | static unsigned long pack_entry_hash(struct packed_git *p, off_t base_offset) | |
1493 | { | |
1494 | unsigned long hash; | |
1495 | ||
1496 | hash = (unsigned long)p + (unsigned long)base_offset; | |
1497 | hash += (hash >> 8) + (hash >> 16); | |
3358004a | 1498 | return hash % MAX_DELTA_CACHE; |
e5e01619 LT |
1499 | } |
1500 | ||
62f255ad | 1501 | static void *cache_or_unpack_entry(struct packed_git *p, off_t base_offset, |
a0cba108 | 1502 | unsigned long *base_size, enum object_type *type, int keep_cache) |
62f255ad | 1503 | { |
e5e01619 LT |
1504 | void *ret; |
1505 | unsigned long hash = pack_entry_hash(p, base_offset); | |
1506 | struct delta_base_cache_entry *ent = delta_base_cache + hash; | |
1507 | ||
1508 | ret = ent->data; | |
1509 | if (ret && ent->p == p && ent->base_offset == base_offset) | |
1510 | goto found_cache_entry; | |
62f255ad | 1511 | return unpack_entry(p, base_offset, type, base_size); |
e5e01619 LT |
1512 | |
1513 | found_cache_entry: | |
18bdec11 | 1514 | if (!keep_cache) { |
a0cba108 | 1515 | ent->data = NULL; |
5e08ecbf NP |
1516 | ent->lru.next->prev = ent->lru.prev; |
1517 | ent->lru.prev->next = ent->lru.next; | |
18bdec11 | 1518 | delta_base_cached -= ent->size; |
182af834 PH |
1519 | } else { |
1520 | ret = xmemdupz(ent->data, ent->size); | |
a0cba108 | 1521 | } |
e5e01619 LT |
1522 | *type = ent->type; |
1523 | *base_size = ent->size; | |
1524 | return ret; | |
62f255ad LT |
1525 | } |
1526 | ||
18bdec11 SP |
1527 | static inline void release_delta_base_cache(struct delta_base_cache_entry *ent) |
1528 | { | |
1529 | if (ent->data) { | |
1530 | free(ent->data); | |
1531 | ent->data = NULL; | |
5e08ecbf NP |
1532 | ent->lru.next->prev = ent->lru.prev; |
1533 | ent->lru.prev->next = ent->lru.next; | |
18bdec11 SP |
1534 | delta_base_cached -= ent->size; |
1535 | } | |
1536 | } | |
1537 | ||
62f255ad LT |
1538 | static void add_delta_base_cache(struct packed_git *p, off_t base_offset, |
1539 | void *base, unsigned long base_size, enum object_type type) | |
1540 | { | |
5e08ecbf | 1541 | unsigned long hash = pack_entry_hash(p, base_offset); |
e5e01619 | 1542 | struct delta_base_cache_entry *ent = delta_base_cache + hash; |
5e08ecbf | 1543 | struct delta_base_cache_lru_list *lru; |
e5e01619 | 1544 | |
18bdec11 SP |
1545 | release_delta_base_cache(ent); |
1546 | delta_base_cached += base_size; | |
5e08ecbf NP |
1547 | |
1548 | for (lru = delta_base_cache_lru.next; | |
1549 | delta_base_cached > delta_base_cache_limit | |
1550 | && lru != &delta_base_cache_lru; | |
1551 | lru = lru->next) { | |
1552 | struct delta_base_cache_entry *f = (void *)lru; | |
18bdec11 SP |
1553 | if (f->type == OBJ_BLOB) |
1554 | release_delta_base_cache(f); | |
1555 | } | |
5e08ecbf NP |
1556 | for (lru = delta_base_cache_lru.next; |
1557 | delta_base_cached > delta_base_cache_limit | |
1558 | && lru != &delta_base_cache_lru; | |
1559 | lru = lru->next) { | |
1560 | struct delta_base_cache_entry *f = (void *)lru; | |
1561 | release_delta_base_cache(f); | |
1562 | } | |
18bdec11 | 1563 | |
e5e01619 LT |
1564 | ent->p = p; |
1565 | ent->base_offset = base_offset; | |
1566 | ent->type = type; | |
1567 | ent->data = base; | |
1568 | ent->size = base_size; | |
5e08ecbf NP |
1569 | ent->lru.next = &delta_base_cache_lru; |
1570 | ent->lru.prev = delta_base_cache_lru.prev; | |
1571 | delta_base_cache_lru.prev->next = &ent->lru; | |
1572 | delta_base_cache_lru.prev = &ent->lru; | |
62f255ad LT |
1573 | } |
1574 | ||
eb950c19 | 1575 | static void *unpack_delta_entry(struct packed_git *p, |
03e79c88 | 1576 | struct pack_window **w_curs, |
c4001d92 | 1577 | off_t curpos, |
1f688557 | 1578 | unsigned long delta_size, |
c4001d92 | 1579 | off_t obj_offset, |
21666f1a | 1580 | enum object_type *type, |
eb950c19 | 1581 | unsigned long *sizep) |
1f688557 | 1582 | { |
7c3e8be3 | 1583 | void *delta_data, *result, *base; |
c4001d92 SP |
1584 | unsigned long base_size; |
1585 | off_t base_offset; | |
43057304 | 1586 | |
21666f1a | 1587 | base_offset = get_delta_base(p, w_curs, &curpos, *type, obj_offset); |
a0cba108 | 1588 | base = cache_or_unpack_entry(p, base_offset, &base_size, type, 0); |
67686d95 | 1589 | if (!base) |
c4001d92 SP |
1590 | die("failed to read delta base object" |
1591 | " at %"PRIuMAX" from %s", | |
1592 | (uintmax_t)base_offset, p->pack_name); | |
67686d95 | 1593 | |
2b87c45b | 1594 | delta_data = unpack_compressed_entry(p, w_curs, curpos, delta_size); |
9064d87b SP |
1595 | if (!delta_data) |
1596 | die("failed to unpack compressed delta" | |
1597 | " at %"PRIuMAX" from %s", | |
1598 | (uintmax_t)curpos, p->pack_name); | |
1f688557 JH |
1599 | result = patch_delta(base, base_size, |
1600 | delta_data, delta_size, | |
21666f1a | 1601 | sizep); |
1f688557 JH |
1602 | if (!result) |
1603 | die("failed to apply delta"); | |
1604 | free(delta_data); | |
62f255ad | 1605 | add_delta_base_cache(p, base_offset, base, base_size, *type); |
1f688557 JH |
1606 | return result; |
1607 | } | |
1608 | ||
c4001d92 | 1609 | void *unpack_entry(struct packed_git *p, off_t obj_offset, |
21666f1a | 1610 | enum object_type *type, unsigned long *sizep) |
1f688557 | 1611 | { |
03e79c88 | 1612 | struct pack_window *w_curs = NULL; |
c4001d92 | 1613 | off_t curpos = obj_offset; |
21666f1a | 1614 | void *data; |
1f688557 | 1615 | |
21666f1a NP |
1616 | *type = unpack_object_header(p, &w_curs, &curpos, sizep); |
1617 | switch (*type) { | |
eb32d236 NP |
1618 | case OBJ_OFS_DELTA: |
1619 | case OBJ_REF_DELTA: | |
21666f1a NP |
1620 | data = unpack_delta_entry(p, &w_curs, curpos, *sizep, |
1621 | obj_offset, type, sizep); | |
4d703a1a | 1622 | break; |
a733cb60 | 1623 | case OBJ_COMMIT: |
a733cb60 | 1624 | case OBJ_TREE: |
a733cb60 | 1625 | case OBJ_BLOB: |
a733cb60 | 1626 | case OBJ_TAG: |
21666f1a | 1627 | data = unpack_compressed_entry(p, &w_curs, curpos, *sizep); |
4d703a1a | 1628 | break; |
1f688557 | 1629 | default: |
21666f1a | 1630 | die("unknown object type %i in %s", *type, p->pack_name); |
1f688557 | 1631 | } |
03e79c88 | 1632 | unuse_pack(&w_curs); |
21666f1a | 1633 | return data; |
1f688557 JH |
1634 | } |
1635 | ||
d079837e | 1636 | const unsigned char *nth_packed_object_sha1(struct packed_git *p, |
d72308e0 | 1637 | uint32_t n) |
9a217f2a | 1638 | { |
42873078 | 1639 | const unsigned char *index = p->index_data; |
d079837e SP |
1640 | if (!index) { |
1641 | if (open_pack_index(p)) | |
1642 | return NULL; | |
1643 | index = p->index_data; | |
1644 | } | |
57059091 | 1645 | if (n >= p->num_objects) |
d72308e0 | 1646 | return NULL; |
74e34e1f NP |
1647 | index += 4 * 256; |
1648 | if (p->index_version == 1) { | |
1649 | return index + 24 * n + 4; | |
1650 | } else { | |
1651 | index += 8; | |
1652 | return index + 20 * n; | |
1653 | } | |
1654 | } | |
1655 | ||
1656 | static off_t nth_packed_object_offset(const struct packed_git *p, uint32_t n) | |
1657 | { | |
1658 | const unsigned char *index = p->index_data; | |
1659 | index += 4 * 256; | |
1660 | if (p->index_version == 1) { | |
1661 | return ntohl(*((uint32_t *)(index + 24 * n))); | |
1662 | } else { | |
1663 | uint32_t off; | |
1664 | index += 8 + p->num_objects * (20 + 4); | |
1665 | off = ntohl(*((uint32_t *)(index + 4 * n))); | |
1666 | if (!(off & 0x80000000)) | |
1667 | return off; | |
1668 | index += p->num_objects * 4 + (off & 0x7fffffff) * 8; | |
1669 | return (((uint64_t)ntohl(*((uint32_t *)(index + 0)))) << 32) | | |
1670 | ntohl(*((uint32_t *)(index + 4))); | |
1671 | } | |
9a217f2a JH |
1672 | } |
1673 | ||
c4001d92 | 1674 | off_t find_pack_entry_one(const unsigned char *sha1, |
43057304 | 1675 | struct packed_git *p) |
1f688557 | 1676 | { |
42873078 | 1677 | const uint32_t *level1_ofs = p->index_data; |
42873078 | 1678 | const unsigned char *index = p->index_data; |
628522ec JH |
1679 | unsigned hi, lo, stride; |
1680 | static int use_lookup = -1; | |
1681 | static int debug_lookup = -1; | |
1682 | ||
1683 | if (debug_lookup < 0) | |
1684 | debug_lookup = !!getenv("GIT_DEBUG_LOOKUP"); | |
42873078 | 1685 | |
d079837e SP |
1686 | if (!index) { |
1687 | if (open_pack_index(p)) | |
1688 | return 0; | |
1689 | level1_ofs = p->index_data; | |
1690 | index = p->index_data; | |
1691 | } | |
74e34e1f NP |
1692 | if (p->index_version > 1) { |
1693 | level1_ofs += 2; | |
1694 | index += 8; | |
1695 | } | |
42873078 | 1696 | index += 4 * 256; |
74e34e1f NP |
1697 | hi = ntohl(level1_ofs[*sha1]); |
1698 | lo = ((*sha1 == 0x0) ? 0 : ntohl(level1_ofs[*sha1 - 1])); | |
628522ec JH |
1699 | if (p->index_version > 1) { |
1700 | stride = 20; | |
1701 | } else { | |
1702 | stride = 24; | |
1703 | index += 4; | |
1704 | } | |
1705 | ||
1706 | if (debug_lookup) | |
1707 | printf("%02x%02x%02x... lo %u hi %u nr %u\n", | |
1708 | sha1[0], sha1[1], sha1[2], lo, hi, p->num_objects); | |
1709 | ||
1710 | if (use_lookup < 0) | |
1711 | use_lookup = !!getenv("GIT_USE_LOOKUP"); | |
1712 | if (use_lookup) { | |
1713 | int pos = sha1_entry_pos(index, stride, 0, | |
1714 | lo, hi, p->num_objects, sha1); | |
1715 | if (pos < 0) | |
1716 | return 0; | |
1717 | return nth_packed_object_offset(p, pos); | |
1718 | } | |
1f688557 JH |
1719 | |
1720 | do { | |
74e34e1f | 1721 | unsigned mi = (lo + hi) / 2; |
628522ec JH |
1722 | int cmp = hashcmp(index + mi * stride, sha1); |
1723 | ||
1724 | if (debug_lookup) | |
1725 | printf("lo %u hi %u rg %u mi %u\n", | |
1726 | lo, hi, hi - lo, mi); | |
43057304 | 1727 | if (!cmp) |
74e34e1f | 1728 | return nth_packed_object_offset(p, mi); |
1f688557 JH |
1729 | if (cmp > 0) |
1730 | hi = mi; | |
1731 | else | |
1732 | lo = mi+1; | |
1733 | } while (lo < hi); | |
1734 | return 0; | |
1735 | } | |
1736 | ||
000dfd3f | 1737 | int matches_pack_name(struct packed_git *p, const char *name) |
d4ff6d92 SP |
1738 | { |
1739 | const char *last_c, *c; | |
1740 | ||
000dfd3f JH |
1741 | if (!strcmp(p->pack_name, name)) |
1742 | return 1; | |
d4ff6d92 SP |
1743 | |
1744 | for (c = p->pack_name, last_c = c; *c;) | |
1745 | if (*c == '/') | |
1746 | last_c = ++c; | |
1747 | else | |
1748 | ++c; | |
000dfd3f JH |
1749 | if (!strcmp(last_c, name)) |
1750 | return 1; | |
d4ff6d92 | 1751 | |
000dfd3f | 1752 | return 0; |
d4ff6d92 SP |
1753 | } |
1754 | ||
106d710b | 1755 | static int find_pack_entry(const unsigned char *sha1, struct pack_entry *e, const char **ignore_packed) |
1f688557 | 1756 | { |
f7c22cc6 | 1757 | static struct packed_git *last_found = (void *)1; |
1f688557 | 1758 | struct packed_git *p; |
c4001d92 | 1759 | off_t offset; |
43057304 | 1760 | |
1f688557 | 1761 | prepare_packed_git(); |
f7c22cc6 NP |
1762 | if (!packed_git) |
1763 | return 0; | |
1764 | p = (last_found == (void *)1) ? packed_git : last_found; | |
1f688557 | 1765 | |
f7c22cc6 | 1766 | do { |
106d710b JH |
1767 | if (ignore_packed) { |
1768 | const char **ig; | |
1769 | for (ig = ignore_packed; *ig; ig++) | |
000dfd3f | 1770 | if (matches_pack_name(p, *ig)) |
106d710b JH |
1771 | break; |
1772 | if (*ig) | |
f7c22cc6 | 1773 | goto next; |
106d710b | 1774 | } |
f7c22cc6 | 1775 | |
43057304 NP |
1776 | offset = find_pack_entry_one(sha1, p); |
1777 | if (offset) { | |
c715f783 SP |
1778 | /* |
1779 | * We are about to tell the caller where they can | |
1780 | * locate the requested object. We better make | |
1781 | * sure the packfile is still here and can be | |
1782 | * accessed before supplying that answer, as | |
1783 | * it may have been deleted since the index | |
1784 | * was loaded! | |
1785 | */ | |
1786 | if (p->pack_fd == -1 && open_packed_git(p)) { | |
1787 | error("packfile %s cannot be accessed", p->pack_name); | |
f7c22cc6 | 1788 | goto next; |
c715f783 | 1789 | } |
43057304 NP |
1790 | e->offset = offset; |
1791 | e->p = p; | |
1792 | hashcpy(e->sha1, sha1); | |
f7c22cc6 | 1793 | last_found = p; |
1f688557 | 1794 | return 1; |
43057304 | 1795 | } |
f7c22cc6 NP |
1796 | |
1797 | next: | |
1798 | if (p == last_found) | |
1799 | p = packed_git; | |
1800 | else | |
1801 | p = p->next; | |
1802 | if (p == last_found) | |
1803 | p = p->next; | |
1804 | } while (p); | |
1f688557 JH |
1805 | return 0; |
1806 | } | |
1807 | ||
a6080a0a | 1808 | struct packed_git *find_sha1_pack(const unsigned char *sha1, |
bf592c50 DB |
1809 | struct packed_git *packs) |
1810 | { | |
1811 | struct packed_git *p; | |
bf592c50 DB |
1812 | |
1813 | for (p = packs; p; p = p->next) { | |
43057304 | 1814 | if (find_pack_entry_one(sha1, p)) |
bf592c50 DB |
1815 | return p; |
1816 | } | |
1817 | return NULL; | |
21666f1a | 1818 | |
bf592c50 DB |
1819 | } |
1820 | ||
21666f1a | 1821 | static int sha1_loose_object_info(const unsigned char *sha1, unsigned long *sizep) |
65c2e0c3 | 1822 | { |
36e4d74a | 1823 | int status; |
65c2e0c3 JH |
1824 | unsigned long mapsize, size; |
1825 | void *map; | |
1826 | z_stream stream; | |
d65a16f6 | 1827 | char hdr[32]; |
65c2e0c3 | 1828 | |
bb6b8e4f | 1829 | map = map_sha1_file(sha1, &mapsize); |
f0df4ed5 JS |
1830 | if (!map) |
1831 | return error("unable to find %s", sha1_to_hex(sha1)); | |
36e4d74a JH |
1832 | if (unpack_sha1_header(&stream, map, mapsize, hdr, sizeof(hdr)) < 0) |
1833 | status = error("unable to unpack %s header", | |
1834 | sha1_to_hex(sha1)); | |
21666f1a | 1835 | else if ((status = parse_sha1_header(hdr, &size)) < 0) |
36e4d74a | 1836 | status = error("unable to parse %s header", sha1_to_hex(sha1)); |
21666f1a NP |
1837 | else if (sizep) |
1838 | *sizep = size; | |
65c2e0c3 JH |
1839 | inflateEnd(&stream); |
1840 | munmap(map, mapsize); | |
1841 | return status; | |
1842 | } | |
1843 | ||
21666f1a | 1844 | int sha1_object_info(const unsigned char *sha1, unsigned long *sizep) |
f0df4ed5 | 1845 | { |
f0df4ed5 JS |
1846 | struct pack_entry e; |
1847 | ||
1848 | if (!find_pack_entry(sha1, &e, NULL)) { | |
1849 | reprepare_packed_git(); | |
1850 | if (!find_pack_entry(sha1, &e, NULL)) | |
21666f1a | 1851 | return sha1_loose_object_info(sha1, sizep); |
f0df4ed5 | 1852 | } |
21666f1a | 1853 | return packed_object_info(e.p, e.offset, sizep); |
f0df4ed5 JS |
1854 | } |
1855 | ||
21666f1a NP |
1856 | static void *read_packed_sha1(const unsigned char *sha1, |
1857 | enum object_type *type, unsigned long *size) | |
1f688557 JH |
1858 | { |
1859 | struct pack_entry e; | |
1860 | ||
8276c007 | 1861 | if (!find_pack_entry(sha1, &e, NULL)) |
1f688557 | 1862 | return NULL; |
8276c007 | 1863 | else |
a0cba108 | 1864 | return cache_or_unpack_entry(e.p, e.offset, size, type, 1); |
1f688557 JH |
1865 | } |
1866 | ||
d66b37bb JH |
1867 | /* |
1868 | * This is meant to hold a *small* number of objects that you would | |
1869 | * want read_sha1_file() to be able to return, but yet you do not want | |
1870 | * to write them into the object store (e.g. a browse-only | |
1871 | * application). | |
1872 | */ | |
1873 | static struct cached_object { | |
1874 | unsigned char sha1[20]; | |
21666f1a | 1875 | enum object_type type; |
d66b37bb JH |
1876 | void *buf; |
1877 | unsigned long size; | |
1878 | } *cached_objects; | |
1879 | static int cached_object_nr, cached_object_alloc; | |
1880 | ||
346245a1 JK |
1881 | static struct cached_object empty_tree = { |
1882 | /* empty tree sha1: 4b825dc642cb6eb9a060e54bf8d69288fbee4904 */ | |
1883 | "\x4b\x82\x5d\xc6\x42\xcb\x6e\xb9\xa0\x60" | |
1884 | "\xe5\x4b\xf8\xd6\x92\x88\xfb\xee\x49\x04", | |
1885 | OBJ_TREE, | |
1886 | "", | |
1887 | 0 | |
1888 | }; | |
1889 | ||
d66b37bb JH |
1890 | static struct cached_object *find_cached_object(const unsigned char *sha1) |
1891 | { | |
1892 | int i; | |
1893 | struct cached_object *co = cached_objects; | |
1894 | ||
1895 | for (i = 0; i < cached_object_nr; i++, co++) { | |
1896 | if (!hashcmp(co->sha1, sha1)) | |
1897 | return co; | |
1898 | } | |
346245a1 JK |
1899 | if (!hashcmp(sha1, empty_tree.sha1)) |
1900 | return &empty_tree; | |
d66b37bb JH |
1901 | return NULL; |
1902 | } | |
1903 | ||
21666f1a NP |
1904 | int pretend_sha1_file(void *buf, unsigned long len, enum object_type type, |
1905 | unsigned char *sha1) | |
d66b37bb JH |
1906 | { |
1907 | struct cached_object *co; | |
1908 | ||
21666f1a | 1909 | hash_sha1_file(buf, len, typename(type), sha1); |
d66b37bb JH |
1910 | if (has_sha1_file(sha1) || find_cached_object(sha1)) |
1911 | return 0; | |
1912 | if (cached_object_alloc <= cached_object_nr) { | |
1913 | cached_object_alloc = alloc_nr(cached_object_alloc); | |
1914 | cached_objects = xrealloc(cached_objects, | |
1915 | sizeof(*cached_objects) * | |
1916 | cached_object_alloc); | |
1917 | } | |
1918 | co = &cached_objects[cached_object_nr++]; | |
1919 | co->size = len; | |
21666f1a | 1920 | co->type = type; |
efa13f7b JH |
1921 | co->buf = xmalloc(len); |
1922 | memcpy(co->buf, buf, len); | |
d66b37bb JH |
1923 | hashcpy(co->sha1, sha1); |
1924 | return 0; | |
1925 | } | |
1926 | ||
21666f1a NP |
1927 | void *read_sha1_file(const unsigned char *sha1, enum object_type *type, |
1928 | unsigned long *size) | |
0fcfd160 LT |
1929 | { |
1930 | unsigned long mapsize; | |
1931 | void *map, *buf; | |
d66b37bb JH |
1932 | struct cached_object *co; |
1933 | ||
1934 | co = find_cached_object(sha1); | |
1935 | if (co) { | |
21666f1a | 1936 | *type = co->type; |
d66b37bb | 1937 | *size = co->size; |
182af834 | 1938 | return xmemdupz(co->buf, co->size); |
d66b37bb | 1939 | } |
0fcfd160 | 1940 | |
8276c007 PE |
1941 | buf = read_packed_sha1(sha1, type, size); |
1942 | if (buf) | |
1943 | return buf; | |
bb6b8e4f | 1944 | map = map_sha1_file(sha1, &mapsize); |
0fcfd160 | 1945 | if (map) { |
7efbff75 | 1946 | buf = unpack_sha1_file(map, mapsize, type, size, sha1); |
0fcfd160 LT |
1947 | munmap(map, mapsize); |
1948 | return buf; | |
1949 | } | |
637cdd9d | 1950 | reprepare_packed_git(); |
8276c007 | 1951 | return read_packed_sha1(sha1, type, size); |
0fcfd160 LT |
1952 | } |
1953 | ||
40469ee9 | 1954 | void *read_object_with_reference(const unsigned char *sha1, |
21666f1a | 1955 | const char *required_type_name, |
40469ee9 JH |
1956 | unsigned long *size, |
1957 | unsigned char *actual_sha1_return) | |
f4913f91 | 1958 | { |
21666f1a | 1959 | enum object_type type, required_type; |
f4913f91 JH |
1960 | void *buffer; |
1961 | unsigned long isize; | |
40469ee9 | 1962 | unsigned char actual_sha1[20]; |
f4913f91 | 1963 | |
21666f1a | 1964 | required_type = type_from_string(required_type_name); |
e702496e | 1965 | hashcpy(actual_sha1, sha1); |
40469ee9 JH |
1966 | while (1) { |
1967 | int ref_length = -1; | |
1968 | const char *ref_type = NULL; | |
f4913f91 | 1969 | |
21666f1a | 1970 | buffer = read_sha1_file(actual_sha1, &type, &isize); |
40469ee9 JH |
1971 | if (!buffer) |
1972 | return NULL; | |
21666f1a | 1973 | if (type == required_type) { |
40469ee9 JH |
1974 | *size = isize; |
1975 | if (actual_sha1_return) | |
e702496e | 1976 | hashcpy(actual_sha1_return, actual_sha1); |
40469ee9 JH |
1977 | return buffer; |
1978 | } | |
1979 | /* Handle references */ | |
21666f1a | 1980 | else if (type == OBJ_COMMIT) |
40469ee9 | 1981 | ref_type = "tree "; |
21666f1a | 1982 | else if (type == OBJ_TAG) |
40469ee9 JH |
1983 | ref_type = "object "; |
1984 | else { | |
1985 | free(buffer); | |
1986 | return NULL; | |
1987 | } | |
1988 | ref_length = strlen(ref_type); | |
f4913f91 | 1989 | |
50974ec9 MK |
1990 | if (ref_length + 40 > isize || |
1991 | memcmp(buffer, ref_type, ref_length) || | |
1d7f171c | 1992 | get_sha1_hex((char *) buffer + ref_length, actual_sha1)) { |
40469ee9 JH |
1993 | free(buffer); |
1994 | return NULL; | |
1995 | } | |
1cf58e72 | 1996 | free(buffer); |
40469ee9 JH |
1997 | /* Now we have the ID of the referred-to object in |
1998 | * actual_sha1. Check again. */ | |
f4913f91 | 1999 | } |
f4913f91 JH |
2000 | } |
2001 | ||
ce9fbf16 | 2002 | static void write_sha1_file_prepare(const void *buf, unsigned long len, |
972a9155 | 2003 | const char *type, unsigned char *sha1, |
d65a16f6 | 2004 | char *hdr, int *hdrlen) |
d410c0f5 JH |
2005 | { |
2006 | SHA_CTX c; | |
2007 | ||
2008 | /* Generate the header */ | |
d65a16f6 | 2009 | *hdrlen = sprintf(hdr, "%s %lu", type, len)+1; |
d410c0f5 JH |
2010 | |
2011 | /* Sha1.. */ | |
2012 | SHA1_Init(&c); | |
2013 | SHA1_Update(&c, hdr, *hdrlen); | |
2014 | SHA1_Update(&c, buf, len); | |
2015 | SHA1_Final(sha1, &c); | |
d410c0f5 JH |
2016 | } |
2017 | ||
230f1322 LT |
2018 | /* |
2019 | * Link the tempfile to the final place, possibly creating the | |
2020 | * last directory level as you do so. | |
2021 | * | |
2022 | * Returns the errno on failure, 0 on success. | |
2023 | */ | |
839837b9 | 2024 | static int link_temp_to_file(const char *tmpfile, const char *filename) |
230f1322 LT |
2025 | { |
2026 | int ret; | |
756aaf4a | 2027 | char *dir; |
230f1322 LT |
2028 | |
2029 | if (!link(tmpfile, filename)) | |
2030 | return 0; | |
2031 | ||
2032 | /* | |
756aaf4a | 2033 | * Try to mkdir the last path component if that failed. |
230f1322 LT |
2034 | * |
2035 | * Re-try the "link()" regardless of whether the mkdir | |
2036 | * succeeds, since a race might mean that somebody | |
2037 | * else succeeded. | |
2038 | */ | |
2039 | ret = errno; | |
756aaf4a SP |
2040 | dir = strrchr(filename, '/'); |
2041 | if (dir) { | |
2042 | *dir = 0; | |
866cae0d | 2043 | if (!mkdir(filename, 0777) && adjust_shared_perm(filename)) { |
91c23e48 | 2044 | *dir = '/'; |
756aaf4a | 2045 | return -2; |
91c23e48 | 2046 | } |
756aaf4a SP |
2047 | *dir = '/'; |
2048 | if (!link(tmpfile, filename)) | |
2049 | return 0; | |
2050 | ret = errno; | |
230f1322 LT |
2051 | } |
2052 | return ret; | |
2053 | } | |
2054 | ||
2055 | /* | |
2056 | * Move the just written object into its final resting place | |
2057 | */ | |
839837b9 | 2058 | int move_temp_to_file(const char *tmpfile, const char *filename) |
230f1322 LT |
2059 | { |
2060 | int ret = link_temp_to_file(tmpfile, filename); | |
7ebb6fca LT |
2061 | |
2062 | /* | |
2063 | * Coda hack - coda doesn't like cross-directory links, | |
2064 | * so we fall back to a rename, which will mean that it | |
2065 | * won't be able to check collisions, but that's not a | |
2066 | * big deal. | |
2067 | * | |
2068 | * The same holds for FAT formatted media. | |
2069 | * | |
2070 | * When this succeeds, we just return 0. We have nothing | |
2071 | * left to unlink. | |
2072 | */ | |
2073 | if (ret && ret != EEXIST) { | |
2074 | if (!rename(tmpfile, filename)) | |
230f1322 | 2075 | return 0; |
9e48b389 | 2076 | ret = errno; |
230f1322 LT |
2077 | } |
2078 | unlink(tmpfile); | |
2079 | if (ret) { | |
2080 | if (ret != EEXIST) { | |
916d081b | 2081 | return error("unable to write sha1 filename %s: %s\n", filename, strerror(ret)); |
230f1322 LT |
2082 | } |
2083 | /* FIXME!!! Collision check here ? */ | |
2084 | } | |
2085 | ||
2086 | return 0; | |
2087 | } | |
2088 | ||
4d548150 LT |
2089 | static int write_buffer(int fd, const void *buf, size_t len) |
2090 | { | |
d34cf19b | 2091 | if (write_in_full(fd, buf, len) < 0) |
93822c22 | 2092 | return error("file write error (%s)", strerror(errno)); |
4d548150 LT |
2093 | return 0; |
2094 | } | |
2095 | ||
ce9fbf16 | 2096 | int hash_sha1_file(const void *buf, unsigned long len, const char *type, |
abdc3fc8 RS |
2097 | unsigned char *sha1) |
2098 | { | |
d65a16f6 | 2099 | char hdr[32]; |
abdc3fc8 RS |
2100 | int hdrlen; |
2101 | write_sha1_file_prepare(buf, len, type, sha1, hdr, &hdrlen); | |
2102 | return 0; | |
2103 | } | |
2104 | ||
bbac7311 NP |
2105 | static int write_loose_object(const unsigned char *sha1, char *hdr, int hdrlen, |
2106 | void *buf, unsigned long len, time_t mtime) | |
0fcfd160 | 2107 | { |
bbac7311 | 2108 | int fd, size, ret; |
bf0f910d | 2109 | unsigned char *compressed; |
0fcfd160 | 2110 | z_stream stream; |
706bc531 | 2111 | char *filename; |
aac17941 | 2112 | static char tmpfile[PATH_MAX]; |
a44c9a5e | 2113 | |
972a9155 | 2114 | filename = sha1_file_name(sha1); |
aac17941 LT |
2115 | fd = open(filename, O_RDONLY); |
2116 | if (fd >= 0) { | |
706bc531 | 2117 | /* |
aac17941 LT |
2118 | * FIXME!!! We might do collision checking here, but we'd |
2119 | * need to uncompress the old file and check it. Later. | |
706bc531 | 2120 | */ |
aac17941 | 2121 | close(fd); |
706bc531 LT |
2122 | return 0; |
2123 | } | |
2124 | ||
aac17941 | 2125 | if (errno != ENOENT) { |
916d081b | 2126 | return error("sha1 file %s: %s\n", filename, strerror(errno)); |
aac17941 LT |
2127 | } |
2128 | ||
0e55181f | 2129 | snprintf(tmpfile, sizeof(tmpfile), "%s/tmp_obj_XXXXXX", get_object_directory()); |
ace1534d | 2130 | |
aac17941 LT |
2131 | fd = mkstemp(tmpfile); |
2132 | if (fd < 0) { | |
916d081b PB |
2133 | if (errno == EPERM) |
2134 | return error("insufficient permission for adding an object to repository database %s\n", get_object_directory()); | |
2135 | else | |
2136 | return error("unable to create temporary sha1 filename %s: %s\n", tmpfile, strerror(errno)); | |
aac17941 LT |
2137 | } |
2138 | ||
0fcfd160 LT |
2139 | /* Set it up */ |
2140 | memset(&stream, 0, sizeof(stream)); | |
12f6c308 | 2141 | deflateInit(&stream, zlib_compression_level); |
93821bd9 | 2142 | size = 8 + deflateBound(&stream, len+hdrlen); |
812666c8 | 2143 | compressed = xmalloc(size); |
0fcfd160 LT |
2144 | |
2145 | /* Compress it */ | |
0fcfd160 LT |
2146 | stream.next_out = compressed; |
2147 | stream.avail_out = size; | |
a44c9a5e LT |
2148 | |
2149 | /* First header.. */ | |
d65a16f6 | 2150 | stream.next_in = (unsigned char *)hdr; |
a44c9a5e | 2151 | stream.avail_in = hdrlen; |
726f852b NP |
2152 | while (deflate(&stream, 0) == Z_OK) |
2153 | /* nothing */; | |
a44c9a5e LT |
2154 | |
2155 | /* Then the data itself.. */ | |
2156 | stream.next_in = buf; | |
2157 | stream.avail_in = len; | |
ac54c277 LT |
2158 | ret = deflate(&stream, Z_FINISH); |
2159 | if (ret != Z_STREAM_END) | |
2160 | die("unable to deflate new object %s (%d)", sha1_to_hex(sha1), ret); | |
2161 | ||
2162 | ret = deflateEnd(&stream); | |
2163 | if (ret != Z_OK) | |
2164 | die("deflateEnd on object %s failed (%d)", sha1_to_hex(sha1), ret); | |
2165 | ||
0fcfd160 LT |
2166 | size = stream.total_out; |
2167 | ||
4d548150 LT |
2168 | if (write_buffer(fd, compressed, size) < 0) |
2169 | die("unable to write sha1 file"); | |
aac17941 | 2170 | fchmod(fd, 0444); |
e82973cf JH |
2171 | if (close(fd)) |
2172 | die("unable to write sha1 file"); | |
383f85b7 | 2173 | free(compressed); |
0fcfd160 | 2174 | |
bbac7311 NP |
2175 | if (mtime) { |
2176 | struct utimbuf utb; | |
2177 | utb.actime = mtime; | |
2178 | utb.modtime = mtime; | |
2179 | if (utime(tmpfile, &utb) < 0) | |
2180 | warning("failed utime() on %s: %s", | |
2181 | tmpfile, strerror(errno)); | |
2182 | } | |
2183 | ||
230f1322 | 2184 | return move_temp_to_file(tmpfile, filename); |
0fcfd160 | 2185 | } |
8237b185 | 2186 | |
bbac7311 NP |
2187 | int write_sha1_file(void *buf, unsigned long len, const char *type, unsigned char *returnsha1) |
2188 | { | |
2189 | unsigned char sha1[20]; | |
2190 | char hdr[32]; | |
2191 | int hdrlen; | |
2192 | ||
2193 | /* Normally if we have it in the pack then we do not bother writing | |
2194 | * it out into .git/objects/??/?{38} file. | |
2195 | */ | |
2196 | write_sha1_file_prepare(buf, len, type, sha1, hdr, &hdrlen); | |
2197 | if (returnsha1) | |
2198 | hashcpy(returnsha1, sha1); | |
2199 | if (has_sha1_file(sha1)) | |
2200 | return 0; | |
2201 | return write_loose_object(sha1, hdr, hdrlen, buf, len, 0); | |
2202 | } | |
2203 | ||
2204 | int force_object_loose(const unsigned char *sha1, time_t mtime) | |
2205 | { | |
2206 | struct stat st; | |
2207 | void *buf; | |
2208 | unsigned long len; | |
2209 | enum object_type type; | |
2210 | char hdr[32]; | |
2211 | int hdrlen; | |
2212 | ||
2213 | if (find_sha1_file(sha1, &st)) | |
2214 | return 0; | |
2215 | buf = read_packed_sha1(sha1, &type, &len); | |
2216 | if (!buf) | |
2217 | return error("cannot read sha1_file for %s", sha1_to_hex(sha1)); | |
2218 | hdrlen = sprintf(hdr, "%s %lu", typename(type), len) + 1; | |
2219 | return write_loose_object(sha1, hdr, hdrlen, buf, len, mtime); | |
2220 | } | |
2221 | ||
4d548150 LT |
2222 | /* |
2223 | * We need to unpack and recompress the object for writing | |
2224 | * it out to a different file. | |
2225 | */ | |
2226 | static void *repack_object(const unsigned char *sha1, unsigned long *objsize) | |
a5eda52b | 2227 | { |
4d548150 | 2228 | size_t size; |
a5eda52b | 2229 | z_stream stream; |
4d548150 LT |
2230 | unsigned char *unpacked; |
2231 | unsigned long len; | |
21666f1a | 2232 | enum object_type type; |
d65a16f6 | 2233 | char hdr[32]; |
4d548150 LT |
2234 | int hdrlen; |
2235 | void *buf; | |
bfc66daf | 2236 | |
a9486b02 | 2237 | /* need to unpack and recompress it by itself */ |
21666f1a | 2238 | unpacked = read_packed_sha1(sha1, &type, &len); |
8276c007 PE |
2239 | if (!unpacked) |
2240 | error("cannot read sha1_file for %s", sha1_to_hex(sha1)); | |
a5eda52b | 2241 | |
21666f1a | 2242 | hdrlen = sprintf(hdr, "%s %lu", typename(type), len) + 1; |
a5eda52b | 2243 | |
4d548150 LT |
2244 | /* Set it up */ |
2245 | memset(&stream, 0, sizeof(stream)); | |
12f6c308 | 2246 | deflateInit(&stream, zlib_compression_level); |
4d548150 LT |
2247 | size = deflateBound(&stream, len + hdrlen); |
2248 | buf = xmalloc(size); | |
a5eda52b | 2249 | |
4d548150 LT |
2250 | /* Compress it */ |
2251 | stream.next_out = buf; | |
2252 | stream.avail_out = size; | |
a5eda52b | 2253 | |
4d548150 LT |
2254 | /* First header.. */ |
2255 | stream.next_in = (void *)hdr; | |
2256 | stream.avail_in = hdrlen; | |
2257 | while (deflate(&stream, 0) == Z_OK) | |
2258 | /* nothing */; | |
bfc66daf | 2259 | |
4d548150 LT |
2260 | /* Then the data itself.. */ |
2261 | stream.next_in = unpacked; | |
2262 | stream.avail_in = len; | |
2263 | while (deflate(&stream, Z_FINISH) == Z_OK) | |
2264 | /* nothing */; | |
2265 | deflateEnd(&stream); | |
2266 | free(unpacked); | |
bfc66daf | 2267 | |
4d548150 LT |
2268 | *objsize = stream.total_out; |
2269 | return buf; | |
2270 | } | |
2271 | ||
2272 | int write_sha1_to_fd(int fd, const unsigned char *sha1) | |
2273 | { | |
2274 | int retval; | |
2275 | unsigned long objsize; | |
bb6b8e4f | 2276 | void *buf = map_sha1_file(sha1, &objsize); |
4d548150 LT |
2277 | |
2278 | if (buf) { | |
2279 | retval = write_buffer(fd, buf, objsize); | |
2280 | munmap(buf, objsize); | |
2281 | return retval; | |
2282 | } | |
2283 | ||
2284 | buf = repack_object(sha1, &objsize); | |
2285 | retval = write_buffer(fd, buf, objsize); | |
2286 | free(buf); | |
2287 | return retval; | |
a5eda52b DB |
2288 | } |
2289 | ||
70b9829e DB |
2290 | int write_sha1_from_fd(const unsigned char *sha1, int fd, char *buffer, |
2291 | size_t bufsize, size_t *bufposn) | |
8237b185 | 2292 | { |
230f1322 | 2293 | char tmpfile[PATH_MAX]; |
8237b185 DB |
2294 | int local; |
2295 | z_stream stream; | |
2296 | unsigned char real_sha1[20]; | |
bf0f910d | 2297 | unsigned char discard[4096]; |
8237b185 DB |
2298 | int ret; |
2299 | SHA_CTX c; | |
2300 | ||
0e55181f | 2301 | snprintf(tmpfile, sizeof(tmpfile), "%s/tmp_obj_XXXXXX", get_object_directory()); |
8237b185 | 2302 | |
230f1322 | 2303 | local = mkstemp(tmpfile); |
916d081b PB |
2304 | if (local < 0) { |
2305 | if (errno == EPERM) | |
2306 | return error("insufficient permission for adding an object to repository database %s\n", get_object_directory()); | |
2307 | else | |
2308 | return error("unable to create temporary sha1 filename %s: %s\n", tmpfile, strerror(errno)); | |
2309 | } | |
8237b185 DB |
2310 | |
2311 | memset(&stream, 0, sizeof(stream)); | |
2312 | ||
2313 | inflateInit(&stream); | |
2314 | ||
2315 | SHA1_Init(&c); | |
2316 | ||
2317 | do { | |
2318 | ssize_t size; | |
70b9829e DB |
2319 | if (*bufposn) { |
2320 | stream.avail_in = *bufposn; | |
96ad15ae | 2321 | stream.next_in = (unsigned char *) buffer; |
70b9829e DB |
2322 | do { |
2323 | stream.next_out = discard; | |
2324 | stream.avail_out = sizeof(discard); | |
2325 | ret = inflate(&stream, Z_SYNC_FLUSH); | |
2326 | SHA1_Update(&c, discard, sizeof(discard) - | |
2327 | stream.avail_out); | |
2328 | } while (stream.avail_in && ret == Z_OK); | |
4d548150 LT |
2329 | if (write_buffer(local, buffer, *bufposn - stream.avail_in) < 0) |
2330 | die("unable to write sha1 file"); | |
70b9829e DB |
2331 | memmove(buffer, buffer + *bufposn - stream.avail_in, |
2332 | stream.avail_in); | |
2333 | *bufposn = stream.avail_in; | |
2334 | if (ret != Z_OK) | |
2335 | break; | |
2336 | } | |
93d26e4c | 2337 | size = xread(fd, buffer + *bufposn, bufsize - *bufposn); |
8237b185 DB |
2338 | if (size <= 0) { |
2339 | close(local); | |
230f1322 | 2340 | unlink(tmpfile); |
8237b185 DB |
2341 | if (!size) |
2342 | return error("Connection closed?"); | |
2343 | perror("Reading from connection"); | |
2344 | return -1; | |
2345 | } | |
70b9829e DB |
2346 | *bufposn += size; |
2347 | } while (1); | |
8237b185 DB |
2348 | inflateEnd(&stream); |
2349 | ||
b5b8d814 | 2350 | fchmod(local, 0444); |
0d315468 JM |
2351 | if (close(local) != 0) |
2352 | die("unable to write sha1 file"); | |
8237b185 DB |
2353 | SHA1_Final(real_sha1, &c); |
2354 | if (ret != Z_STREAM_END) { | |
230f1322 | 2355 | unlink(tmpfile); |
8237b185 DB |
2356 | return error("File %s corrupted", sha1_to_hex(sha1)); |
2357 | } | |
a89fccd2 | 2358 | if (hashcmp(sha1, real_sha1)) { |
230f1322 | 2359 | unlink(tmpfile); |
bd2afde8 | 2360 | return error("File %s has bad hash", sha1_to_hex(sha1)); |
8237b185 | 2361 | } |
230f1322 LT |
2362 | |
2363 | return move_temp_to_file(tmpfile, sha1_file_name(sha1)); | |
8237b185 DB |
2364 | } |
2365 | ||
bf592c50 DB |
2366 | int has_pack_index(const unsigned char *sha1) |
2367 | { | |
2368 | struct stat st; | |
2369 | if (stat(sha1_pack_index_name(sha1), &st)) | |
2370 | return 0; | |
2371 | return 1; | |
2372 | } | |
2373 | ||
2374 | int has_pack_file(const unsigned char *sha1) | |
2375 | { | |
2376 | struct stat st; | |
2377 | if (stat(sha1_pack_name(sha1), &st)) | |
2378 | return 0; | |
2379 | return 1; | |
2380 | } | |
2381 | ||
106d710b | 2382 | int has_sha1_pack(const unsigned char *sha1, const char **ignore_packed) |
dade09c2 LT |
2383 | { |
2384 | struct pack_entry e; | |
106d710b | 2385 | return find_pack_entry(sha1, &e, ignore_packed); |
dade09c2 LT |
2386 | } |
2387 | ||
8237b185 DB |
2388 | int has_sha1_file(const unsigned char *sha1) |
2389 | { | |
8237b185 | 2390 | struct stat st; |
1f688557 JH |
2391 | struct pack_entry e; |
2392 | ||
106d710b | 2393 | if (find_pack_entry(sha1, &e, NULL)) |
1f688557 | 2394 | return 1; |
ab90ea5d | 2395 | return find_sha1_file(sha1, &st) ? 1 : 0; |
8237b185 | 2396 | } |
74400e71 | 2397 | |
e7332f96 BE |
2398 | int index_pipe(unsigned char *sha1, int fd, const char *type, int write_object) |
2399 | { | |
fd17f5b5 | 2400 | struct strbuf buf; |
e7332f96 | 2401 | int ret; |
e7332f96 | 2402 | |
fd17f5b5 PH |
2403 | strbuf_init(&buf, 0); |
2404 | if (strbuf_read(&buf, fd, 4096) < 0) { | |
2405 | strbuf_release(&buf); | |
024510c8 DB |
2406 | return -1; |
2407 | } | |
e7332f96 | 2408 | |
024510c8 | 2409 | if (!type) |
8e440259 | 2410 | type = blob_type; |
024510c8 | 2411 | if (write_object) |
fd17f5b5 | 2412 | ret = write_sha1_file(buf.buf, buf.len, type, sha1); |
abdc3fc8 | 2413 | else |
fd17f5b5 PH |
2414 | ret = hash_sha1_file(buf.buf, buf.len, type, sha1); |
2415 | strbuf_release(&buf); | |
2416 | ||
024510c8 DB |
2417 | return ret; |
2418 | } | |
2419 | ||
edaec3fb | 2420 | int index_fd(unsigned char *sha1, int fd, struct stat *st, int write_object, |
53bca91a | 2421 | enum object_type type, const char *path) |
74400e71 | 2422 | { |
dc49cd76 | 2423 | size_t size = xsize_t(st->st_size); |
3a55602e | 2424 | void *buf = NULL; |
6c510bee | 2425 | int ret, re_allocated = 0; |
74400e71 | 2426 | |
74400e71 | 2427 | if (size) |
c4712e45 | 2428 | buf = xmmap(NULL, size, PROT_READ, MAP_PRIVATE, fd, 0); |
74400e71 | 2429 | close(fd); |
74400e71 | 2430 | |
7672db20 | 2431 | if (!type) |
edaec3fb | 2432 | type = OBJ_BLOB; |
6c510bee LT |
2433 | |
2434 | /* | |
2435 | * Convert blobs to git internal format | |
2436 | */ | |
d0d8e14d | 2437 | if ((type == OBJ_BLOB) && S_ISREG(st->st_mode)) { |
5ecd293d PH |
2438 | struct strbuf nbuf; |
2439 | strbuf_init(&nbuf, 0); | |
21e5ad50 SP |
2440 | if (convert_to_git(path, buf, size, &nbuf, |
2441 | write_object ? safe_crlf : 0)) { | |
ac78e548 | 2442 | munmap(buf, size); |
b315c5c0 | 2443 | buf = strbuf_detach(&nbuf, &size); |
6c510bee LT |
2444 | re_allocated = 1; |
2445 | } | |
2446 | } | |
2447 | ||
7672db20 | 2448 | if (write_object) |
edaec3fb | 2449 | ret = write_sha1_file(buf, size, typename(type), sha1); |
abdc3fc8 | 2450 | else |
edaec3fb | 2451 | ret = hash_sha1_file(buf, size, typename(type), sha1); |
6c510bee LT |
2452 | if (re_allocated) { |
2453 | free(buf); | |
2454 | return ret; | |
2455 | } | |
aac17941 LT |
2456 | if (size) |
2457 | munmap(buf, size); | |
2458 | return ret; | |
74400e71 | 2459 | } |
ec1fcc16 JH |
2460 | |
2461 | int index_path(unsigned char *sha1, const char *path, struct stat *st, int write_object) | |
2462 | { | |
2463 | int fd; | |
2464 | char *target; | |
dc49cd76 | 2465 | size_t len; |
ec1fcc16 JH |
2466 | |
2467 | switch (st->st_mode & S_IFMT) { | |
2468 | case S_IFREG: | |
2469 | fd = open(path, O_RDONLY); | |
2470 | if (fd < 0) | |
2471 | return error("open(\"%s\"): %s", path, | |
2472 | strerror(errno)); | |
53bca91a | 2473 | if (index_fd(sha1, fd, st, write_object, OBJ_BLOB, path) < 0) |
ec1fcc16 JH |
2474 | return error("%s: failed to insert into database", |
2475 | path); | |
2476 | break; | |
2477 | case S_IFLNK: | |
dc49cd76 SP |
2478 | len = xsize_t(st->st_size); |
2479 | target = xmalloc(len + 1); | |
2480 | if (readlink(path, target, len + 1) != st->st_size) { | |
ec1fcc16 JH |
2481 | char *errstr = strerror(errno); |
2482 | free(target); | |
2483 | return error("readlink(\"%s\"): %s", path, | |
2484 | errstr); | |
2485 | } | |
abdc3fc8 | 2486 | if (!write_object) |
dc49cd76 SP |
2487 | hash_sha1_file(target, len, blob_type, sha1); |
2488 | else if (write_sha1_file(target, len, blob_type, sha1)) | |
ec1fcc16 JH |
2489 | return error("%s: failed to insert into database", |
2490 | path); | |
2491 | free(target); | |
2492 | break; | |
f35a6d3b LT |
2493 | case S_IFDIR: |
2494 | return resolve_gitlink_ref(path, "HEAD", sha1); | |
ec1fcc16 JH |
2495 | default: |
2496 | return error("%s: unsupported file type", path); | |
2497 | } | |
2498 | return 0; | |
2499 | } | |
a69e5429 JH |
2500 | |
2501 | int read_pack_header(int fd, struct pack_header *header) | |
2502 | { | |
c697ad14 HO |
2503 | if (read_in_full(fd, header, sizeof(*header)) < sizeof(*header)) |
2504 | /* "eof before pack header was fully read" */ | |
2505 | return PH_ERROR_EOF; | |
2506 | ||
a69e5429 JH |
2507 | if (header->hdr_signature != htonl(PACK_SIGNATURE)) |
2508 | /* "protocol error (pack signature mismatch detected)" */ | |
2509 | return PH_ERROR_PACK_SIGNATURE; | |
2510 | if (!pack_version_ok(header->hdr_version)) | |
2511 | /* "protocol error (pack version unsupported)" */ | |
2512 | return PH_ERROR_PROTOCOL; | |
2513 | return 0; | |
2514 | } |