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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 | |
192a6be2 | 38 | const signed char hexval_table[256] = { |
e49521b5 JH |
39 | -1, -1, -1, -1, -1, -1, -1, -1, /* 00-07 */ |
40 | -1, -1, -1, -1, -1, -1, -1, -1, /* 08-0f */ | |
41 | -1, -1, -1, -1, -1, -1, -1, -1, /* 10-17 */ | |
42 | -1, -1, -1, -1, -1, -1, -1, -1, /* 18-1f */ | |
43 | -1, -1, -1, -1, -1, -1, -1, -1, /* 20-27 */ | |
44 | -1, -1, -1, -1, -1, -1, -1, -1, /* 28-2f */ | |
45 | 0, 1, 2, 3, 4, 5, 6, 7, /* 30-37 */ | |
46 | 8, 9, -1, -1, -1, -1, -1, -1, /* 38-3f */ | |
47 | -1, 10, 11, 12, 13, 14, 15, -1, /* 40-47 */ | |
48 | -1, -1, -1, -1, -1, -1, -1, -1, /* 48-4f */ | |
49 | -1, -1, -1, -1, -1, -1, -1, -1, /* 50-57 */ | |
50 | -1, -1, -1, -1, -1, -1, -1, -1, /* 58-5f */ | |
51 | -1, 10, 11, 12, 13, 14, 15, -1, /* 60-67 */ | |
52 | -1, -1, -1, -1, -1, -1, -1, -1, /* 68-67 */ | |
53 | -1, -1, -1, -1, -1, -1, -1, -1, /* 70-77 */ | |
54 | -1, -1, -1, -1, -1, -1, -1, -1, /* 78-7f */ | |
55 | -1, -1, -1, -1, -1, -1, -1, -1, /* 80-87 */ | |
56 | -1, -1, -1, -1, -1, -1, -1, -1, /* 88-8f */ | |
57 | -1, -1, -1, -1, -1, -1, -1, -1, /* 90-97 */ | |
58 | -1, -1, -1, -1, -1, -1, -1, -1, /* 98-9f */ | |
59 | -1, -1, -1, -1, -1, -1, -1, -1, /* a0-a7 */ | |
60 | -1, -1, -1, -1, -1, -1, -1, -1, /* a8-af */ | |
61 | -1, -1, -1, -1, -1, -1, -1, -1, /* b0-b7 */ | |
62 | -1, -1, -1, -1, -1, -1, -1, -1, /* b8-bf */ | |
63 | -1, -1, -1, -1, -1, -1, -1, -1, /* c0-c7 */ | |
64 | -1, -1, -1, -1, -1, -1, -1, -1, /* c8-cf */ | |
65 | -1, -1, -1, -1, -1, -1, -1, -1, /* d0-d7 */ | |
66 | -1, -1, -1, -1, -1, -1, -1, -1, /* d8-df */ | |
67 | -1, -1, -1, -1, -1, -1, -1, -1, /* e0-e7 */ | |
68 | -1, -1, -1, -1, -1, -1, -1, -1, /* e8-ef */ | |
69 | -1, -1, -1, -1, -1, -1, -1, -1, /* f0-f7 */ | |
70 | -1, -1, -1, -1, -1, -1, -1, -1, /* f8-ff */ | |
71 | }; | |
0fcfd160 LT |
72 | |
73 | int get_sha1_hex(const char *hex, unsigned char *sha1) | |
74 | { | |
75 | int i; | |
76 | for (i = 0; i < 20; i++) { | |
77 | unsigned int val = (hexval(hex[0]) << 4) | hexval(hex[1]); | |
78 | if (val & ~0xff) | |
79 | return -1; | |
80 | *sha1++ = val; | |
81 | hex += 2; | |
82 | } | |
83 | return 0; | |
84 | } | |
85 | ||
8385abfd JS |
86 | static inline int offset_1st_component(const char *path) |
87 | { | |
88 | if (has_dos_drive_prefix(path)) | |
89 | return 2 + (path[2] == '/'); | |
90 | return *path == '/'; | |
91 | } | |
92 | ||
b2cb9425 JH |
93 | int safe_create_leading_directories(char *path) |
94 | { | |
8385abfd | 95 | char *pos = path + offset_1st_component(path); |
67d42212 JR |
96 | struct stat st; |
97 | ||
b2cb9425 JH |
98 | while (pos) { |
99 | pos = strchr(pos, '/'); | |
100 | if (!pos) | |
101 | break; | |
102 | *pos = 0; | |
67d42212 JR |
103 | if (!stat(path, &st)) { |
104 | /* path exists */ | |
105 | if (!S_ISDIR(st.st_mode)) { | |
b2cb9425 | 106 | *pos = '/'; |
67d42212 | 107 | return -3; |
b2cb9425 | 108 | } |
457f06d6 | 109 | } |
67d42212 JR |
110 | else if (mkdir(path, 0777)) { |
111 | *pos = '/'; | |
112 | return -1; | |
113 | } | |
457f06d6 JS |
114 | else if (adjust_shared_perm(path)) { |
115 | *pos = '/'; | |
116 | return -2; | |
117 | } | |
b2cb9425 JH |
118 | *pos++ = '/'; |
119 | } | |
120 | return 0; | |
121 | } | |
723c31fe | 122 | |
8e21d63b JK |
123 | int safe_create_leading_directories_const(const char *path) |
124 | { | |
125 | /* path points to cache entries, so xstrdup before messing with it */ | |
126 | char *buf = xstrdup(path); | |
127 | int result = safe_create_leading_directories(buf); | |
128 | free(buf); | |
129 | return result; | |
130 | } | |
131 | ||
3bfaf018 | 132 | char *sha1_to_hex(const unsigned char *sha1) |
0fcfd160 | 133 | { |
dcb3450f LT |
134 | static int bufno; |
135 | static char hexbuffer[4][50]; | |
0fcfd160 | 136 | static const char hex[] = "0123456789abcdef"; |
dcb3450f | 137 | char *buffer = hexbuffer[3 & ++bufno], *buf = buffer; |
0fcfd160 LT |
138 | int i; |
139 | ||
140 | for (i = 0; i < 20; i++) { | |
141 | unsigned int val = *sha1++; | |
142 | *buf++ = hex[val >> 4]; | |
143 | *buf++ = hex[val & 0xf]; | |
144 | } | |
1e80e044 JS |
145 | *buf = '\0'; |
146 | ||
0fcfd160 LT |
147 | return buffer; |
148 | } | |
149 | ||
ace1534d JH |
150 | static void fill_sha1_path(char *pathbuf, const unsigned char *sha1) |
151 | { | |
152 | int i; | |
153 | for (i = 0; i < 20; i++) { | |
154 | static char hex[] = "0123456789abcdef"; | |
155 | unsigned int val = sha1[i]; | |
156 | char *pos = pathbuf + i*2 + (i > 0); | |
157 | *pos++ = hex[val >> 4]; | |
158 | *pos = hex[val & 0xf]; | |
159 | } | |
160 | } | |
161 | ||
0fcfd160 LT |
162 | /* |
163 | * NOTE! This returns a statically allocated buffer, so you have to be | |
790296fd | 164 | * careful about using it. Do an "xstrdup()" if you need to save the |
0fcfd160 | 165 | * filename. |
ace1534d JH |
166 | * |
167 | * Also note that this returns the location for creating. Reading | |
168 | * SHA1 file can happen from any alternate directory listed in the | |
d19938ab | 169 | * DB_ENVIRONMENT environment variable if it is not found in |
ace1534d | 170 | * the primary object database. |
0fcfd160 LT |
171 | */ |
172 | char *sha1_file_name(const unsigned char *sha1) | |
173 | { | |
0fcfd160 LT |
174 | static char *name, *base; |
175 | ||
176 | if (!base) { | |
d19938ab | 177 | const char *sha1_file_directory = get_object_directory(); |
0fcfd160 | 178 | int len = strlen(sha1_file_directory); |
812666c8 | 179 | base = xmalloc(len + 60); |
0fcfd160 LT |
180 | memcpy(base, sha1_file_directory, len); |
181 | memset(base+len, 0, 60); | |
182 | base[len] = '/'; | |
183 | base[len+3] = '/'; | |
184 | name = base + len + 1; | |
185 | } | |
ace1534d | 186 | fill_sha1_path(name, sha1); |
0fcfd160 LT |
187 | return base; |
188 | } | |
189 | ||
633f43e1 | 190 | static char *sha1_get_pack_name(const unsigned char *sha1, |
6eec46bd | 191 | char **name, char **base, const char *which) |
bf592c50 DB |
192 | { |
193 | static const char hex[] = "0123456789abcdef"; | |
633f43e1 | 194 | char *buf; |
bf592c50 DB |
195 | int i; |
196 | ||
633f43e1 | 197 | if (!*base) { |
bf592c50 DB |
198 | const char *sha1_file_directory = get_object_directory(); |
199 | int len = strlen(sha1_file_directory); | |
633f43e1 | 200 | *base = xmalloc(len + 60); |
6eec46bd JH |
201 | sprintf(*base, "%s/pack/pack-1234567890123456789012345678901234567890.%s", |
202 | sha1_file_directory, which); | |
633f43e1 | 203 | *name = *base + len + 11; |
bf592c50 DB |
204 | } |
205 | ||
633f43e1 | 206 | buf = *name; |
bf592c50 DB |
207 | |
208 | for (i = 0; i < 20; i++) { | |
209 | unsigned int val = *sha1++; | |
210 | *buf++ = hex[val >> 4]; | |
211 | *buf++ = hex[val & 0xf]; | |
212 | } | |
a6080a0a | 213 | |
633f43e1 | 214 | return *base; |
bf592c50 DB |
215 | } |
216 | ||
633f43e1 | 217 | char *sha1_pack_name(const unsigned char *sha1) |
bf592c50 | 218 | { |
633f43e1 | 219 | static char *name, *base; |
bf592c50 | 220 | |
6eec46bd | 221 | return sha1_get_pack_name(sha1, &name, &base, "pack"); |
633f43e1 | 222 | } |
bf592c50 | 223 | |
633f43e1 HO |
224 | char *sha1_pack_index_name(const unsigned char *sha1) |
225 | { | |
226 | static char *name, *base; | |
a6080a0a | 227 | |
6eec46bd | 228 | return sha1_get_pack_name(sha1, &name, &base, "idx"); |
bf592c50 DB |
229 | } |
230 | ||
d5a63b99 JH |
231 | struct alternate_object_database *alt_odb_list; |
232 | static struct alternate_object_database **alt_odb_tail; | |
ace1534d | 233 | |
c2f493a4 MW |
234 | static void read_info_alternates(const char * alternates, int depth); |
235 | ||
ddd5d056 JH |
236 | /* |
237 | * Prepare alternate object database registry. | |
d5a63b99 JH |
238 | * |
239 | * The variable alt_odb_list points at the list of struct | |
240 | * alternate_object_database. The elements on this list come from | |
241 | * non-empty elements from colon separated ALTERNATE_DB_ENVIRONMENT | |
242 | * environment variable, and $GIT_OBJECT_DIRECTORY/info/alternates, | |
1494e038 JH |
243 | * whose contents is similar to that environment variable but can be |
244 | * LF separated. Its base points at a statically allocated buffer that | |
d5a63b99 JH |
245 | * contains "/the/directory/corresponding/to/.git/objects/...", while |
246 | * its name points just after the slash at the end of ".git/objects/" | |
247 | * in the example above, and has enough space to hold 40-byte hex | |
248 | * SHA1, an extra slash for the first level indirection, and the | |
249 | * terminating NUL. | |
ddd5d056 | 250 | */ |
c2f493a4 | 251 | static int link_alt_odb_entry(const char * entry, int len, const char * relative_base, int depth) |
ace1534d | 252 | { |
c2f493a4 | 253 | struct stat st; |
1494e038 | 254 | const char *objdir = get_object_directory(); |
c2f493a4 MW |
255 | struct alternate_object_database *ent; |
256 | struct alternate_object_database *alt; | |
257 | /* 43 = 40-byte + 2 '/' + terminating NUL */ | |
258 | int pfxlen = len; | |
259 | int entlen = pfxlen + 43; | |
ccfd3e99 | 260 | int base_len = -1; |
d5a63b99 | 261 | |
85dadc38 | 262 | if (!is_absolute_path(entry) && relative_base) { |
c2f493a4 MW |
263 | /* Relative alt-odb */ |
264 | if (base_len < 0) | |
265 | base_len = strlen(relative_base) + 1; | |
266 | entlen += base_len; | |
267 | pfxlen += base_len; | |
268 | } | |
269 | ent = xmalloc(sizeof(*ent) + entlen); | |
270 | ||
85dadc38 | 271 | if (!is_absolute_path(entry) && relative_base) { |
c2f493a4 MW |
272 | memcpy(ent->base, relative_base, base_len - 1); |
273 | ent->base[base_len - 1] = '/'; | |
274 | memcpy(ent->base + base_len, entry, len); | |
275 | } | |
276 | else | |
277 | memcpy(ent->base, entry, pfxlen); | |
278 | ||
279 | ent->name = ent->base + pfxlen + 1; | |
280 | ent->base[pfxlen + 3] = '/'; | |
281 | ent->base[pfxlen] = ent->base[entlen-1] = 0; | |
282 | ||
283 | /* Detect cases where alternate disappeared */ | |
284 | if (stat(ent->base, &st) || !S_ISDIR(st.st_mode)) { | |
285 | error("object directory %s does not exist; " | |
286 | "check .git/objects/info/alternates.", | |
287 | ent->base); | |
288 | free(ent); | |
289 | return -1; | |
290 | } | |
291 | ||
292 | /* Prevent the common mistake of listing the same | |
293 | * thing twice, or object directory itself. | |
294 | */ | |
295 | for (alt = alt_odb_list; alt; alt = alt->next) { | |
296 | if (!memcmp(ent->base, alt->base, pfxlen)) { | |
297 | free(ent); | |
298 | return -1; | |
299 | } | |
300 | } | |
301 | if (!memcmp(ent->base, objdir, pfxlen)) { | |
302 | free(ent); | |
303 | return -1; | |
304 | } | |
305 | ||
306 | /* add the alternate entry */ | |
307 | *alt_odb_tail = ent; | |
308 | alt_odb_tail = &(ent->next); | |
309 | ent->next = NULL; | |
310 | ||
311 | /* recursively add alternates */ | |
312 | read_info_alternates(ent->base, depth + 1); | |
313 | ||
314 | ent->base[pfxlen] = '/'; | |
315 | ||
316 | return 0; | |
317 | } | |
318 | ||
319 | static void link_alt_odb_entries(const char *alt, const char *ep, int sep, | |
320 | const char *relative_base, int depth) | |
321 | { | |
322 | const char *cp, *last; | |
323 | ||
324 | if (depth > 5) { | |
325 | error("%s: ignoring alternate object stores, nesting too deep.", | |
326 | relative_base); | |
327 | return; | |
328 | } | |
329 | ||
d5a63b99 | 330 | last = alt; |
9577e7e3 JH |
331 | while (last < ep) { |
332 | cp = last; | |
333 | if (cp < ep && *cp == '#') { | |
334 | while (cp < ep && *cp != sep) | |
335 | cp++; | |
336 | last = cp + 1; | |
337 | continue; | |
338 | } | |
c2f493a4 MW |
339 | while (cp < ep && *cp != sep) |
340 | cp++; | |
d5a63b99 | 341 | if (last != cp) { |
85dadc38 | 342 | if (!is_absolute_path(last) && depth) { |
c2f493a4 MW |
343 | error("%s: ignoring relative alternate object store %s", |
344 | relative_base, last); | |
345 | } else { | |
346 | link_alt_odb_entry(last, cp - last, | |
347 | relative_base, depth); | |
1494e038 | 348 | } |
d5a63b99 | 349 | } |
9577e7e3 | 350 | while (cp < ep && *cp == sep) |
d5a63b99 JH |
351 | cp++; |
352 | last = cp; | |
9577e7e3 | 353 | } |
d5a63b99 JH |
354 | } |
355 | ||
c2f493a4 | 356 | static void read_info_alternates(const char * relative_base, int depth) |
d5a63b99 | 357 | { |
9577e7e3 | 358 | char *map; |
dc49cd76 | 359 | size_t mapsz; |
d5a63b99 | 360 | struct stat st; |
9cb18f56 JM |
361 | const char alt_file_name[] = "info/alternates"; |
362 | /* Given that relative_base is no longer than PATH_MAX, | |
363 | ensure that "path" has enough space to append "/", the | |
364 | file name, "info/alternates", and a trailing NUL. */ | |
365 | char path[PATH_MAX + 1 + sizeof alt_file_name]; | |
c2f493a4 | 366 | int fd; |
d5a63b99 | 367 | |
9cb18f56 | 368 | sprintf(path, "%s/%s", relative_base, alt_file_name); |
d5a63b99 JH |
369 | fd = open(path, O_RDONLY); |
370 | if (fd < 0) | |
371 | return; | |
372 | if (fstat(fd, &st) || (st.st_size == 0)) { | |
373 | close(fd); | |
9a217f2a | 374 | return; |
ace1534d | 375 | } |
dc49cd76 SP |
376 | mapsz = xsize_t(st.st_size); |
377 | map = xmmap(NULL, mapsz, PROT_READ, MAP_PRIVATE, fd, 0); | |
d5a63b99 | 378 | close(fd); |
d5a63b99 | 379 | |
dc49cd76 | 380 | link_alt_odb_entries(map, map + mapsz, '\n', relative_base, depth); |
c2f493a4 | 381 | |
dc49cd76 | 382 | munmap(map, mapsz); |
ace1534d JH |
383 | } |
384 | ||
bef70b22 DB |
385 | void add_to_alternates_file(const char *reference) |
386 | { | |
387 | struct lock_file *lock = xcalloc(1, sizeof(struct lock_file)); | |
acd3b9ec | 388 | int fd = hold_lock_file_for_append(lock, git_path("objects/info/alternates"), LOCK_DIE_ON_ERROR); |
bef70b22 DB |
389 | char *alt = mkpath("%s/objects\n", reference); |
390 | write_or_die(fd, alt, strlen(alt)); | |
391 | if (commit_lock_file(lock)) | |
392 | die("could not close alternates file"); | |
393 | if (alt_odb_tail) | |
394 | link_alt_odb_entries(alt, alt + strlen(alt), '\n', NULL, 0); | |
395 | } | |
396 | ||
c2f493a4 MW |
397 | void prepare_alt_odb(void) |
398 | { | |
554fe20d | 399 | const char *alt; |
c2f493a4 | 400 | |
7dc24aa5 SP |
401 | if (alt_odb_tail) |
402 | return; | |
403 | ||
c2f493a4 MW |
404 | alt = getenv(ALTERNATE_DB_ENVIRONMENT); |
405 | if (!alt) alt = ""; | |
406 | ||
c2f493a4 | 407 | alt_odb_tail = &alt_odb_list; |
80ba074f | 408 | link_alt_odb_entries(alt, alt + strlen(alt), PATH_SEP, NULL, 0); |
c2f493a4 MW |
409 | |
410 | read_info_alternates(get_object_directory(), 0); | |
411 | } | |
412 | ||
0f4dc14a | 413 | static int has_loose_object_local(const unsigned char *sha1) |
ace1534d | 414 | { |
ace1534d | 415 | char *name = sha1_file_name(sha1); |
0f4dc14a BC |
416 | return !access(name, F_OK); |
417 | } | |
ace1534d | 418 | |
0f4dc14a BC |
419 | int has_loose_object_nonlocal(const unsigned char *sha1) |
420 | { | |
421 | struct alternate_object_database *alt; | |
9a217f2a | 422 | prepare_alt_odb(); |
d5a63b99 | 423 | for (alt = alt_odb_list; alt; alt = alt->next) { |
0f4dc14a | 424 | fill_sha1_path(alt->name, sha1); |
c529d75a LT |
425 | if (!access(alt->base, F_OK)) |
426 | return 1; | |
ace1534d | 427 | } |
c529d75a | 428 | return 0; |
ace1534d JH |
429 | } |
430 | ||
0f4dc14a BC |
431 | static int has_loose_object(const unsigned char *sha1) |
432 | { | |
433 | return has_loose_object_local(sha1) || | |
434 | has_loose_object_nonlocal(sha1); | |
435 | } | |
436 | ||
60bb8b14 | 437 | static unsigned int pack_used_ctr; |
a53128b6 SP |
438 | static unsigned int pack_mmap_calls; |
439 | static unsigned int peak_pack_open_windows; | |
440 | static unsigned int pack_open_windows; | |
441 | static size_t peak_pack_mapped; | |
60bb8b14 | 442 | static size_t pack_mapped; |
9a217f2a | 443 | struct packed_git *packed_git; |
1f688557 | 444 | |
b79d18c9 | 445 | void pack_report(void) |
a53128b6 SP |
446 | { |
447 | fprintf(stderr, | |
e05db0fd PR |
448 | "pack_report: getpagesize() = %10" SZ_FMT "\n" |
449 | "pack_report: core.packedGitWindowSize = %10" SZ_FMT "\n" | |
450 | "pack_report: core.packedGitLimit = %10" SZ_FMT "\n", | |
9e42d6a1 SP |
451 | sz_fmt(getpagesize()), |
452 | sz_fmt(packed_git_window_size), | |
453 | sz_fmt(packed_git_limit)); | |
a53128b6 SP |
454 | fprintf(stderr, |
455 | "pack_report: pack_used_ctr = %10u\n" | |
456 | "pack_report: pack_mmap_calls = %10u\n" | |
457 | "pack_report: pack_open_windows = %10u / %10u\n" | |
e05db0fd PR |
458 | "pack_report: pack_mapped = " |
459 | "%10" SZ_FMT " / %10" SZ_FMT "\n", | |
a53128b6 SP |
460 | pack_used_ctr, |
461 | pack_mmap_calls, | |
462 | pack_open_windows, peak_pack_open_windows, | |
9e42d6a1 | 463 | sz_fmt(pack_mapped), sz_fmt(peak_pack_mapped)); |
a53128b6 SP |
464 | } |
465 | ||
42873078 | 466 | static int check_packed_git_idx(const char *path, struct packed_git *p) |
1f688557 JH |
467 | { |
468 | void *idx_map; | |
42873078 | 469 | struct pack_idx_header *hdr; |
dc49cd76 | 470 | size_t idx_size; |
74e34e1f | 471 | uint32_t version, nr, i, *index; |
e93ec6f9 | 472 | int fd = open(path, O_RDONLY); |
1f688557 | 473 | struct stat st; |
42873078 | 474 | |
1f688557 JH |
475 | if (fd < 0) |
476 | return -1; | |
477 | if (fstat(fd, &st)) { | |
478 | close(fd); | |
479 | return -1; | |
480 | } | |
dc49cd76 | 481 | idx_size = xsize_t(st.st_size); |
2d88451b SP |
482 | if (idx_size < 4 * 256 + 20 + 20) { |
483 | close(fd); | |
484 | return error("index file %s is too small", path); | |
485 | } | |
c4712e45 | 486 | idx_map = xmmap(NULL, idx_size, PROT_READ, MAP_PRIVATE, fd, 0); |
1f688557 | 487 | close(fd); |
1f688557 | 488 | |
42873078 NP |
489 | hdr = idx_map; |
490 | if (hdr->idx_signature == htonl(PACK_IDX_SIGNATURE)) { | |
74e34e1f NP |
491 | version = ntohl(hdr->idx_version); |
492 | if (version < 2 || version > 2) { | |
493 | munmap(idx_map, idx_size); | |
6e1c2344 | 494 | return error("index file %s is version %"PRIu32 |
74e34e1f NP |
495 | " and is not supported by this binary" |
496 | " (try upgrading GIT to a newer version)", | |
497 | path, version); | |
498 | } | |
499 | } else | |
500 | version = 1; | |
df1b059d | 501 | |
1f688557 | 502 | nr = 0; |
42873078 | 503 | index = idx_map; |
74e34e1f NP |
504 | if (version > 1) |
505 | index += 2; /* skip index header */ | |
1f688557 | 506 | for (i = 0; i < 256; i++) { |
326bf396 | 507 | uint32_t n = ntohl(index[i]); |
2d88451b SP |
508 | if (n < nr) { |
509 | munmap(idx_map, idx_size); | |
df1b059d | 510 | return error("non-monotonic index %s", path); |
2d88451b | 511 | } |
1f688557 JH |
512 | nr = n; |
513 | } | |
514 | ||
74e34e1f NP |
515 | if (version == 1) { |
516 | /* | |
517 | * Total size: | |
518 | * - 256 index entries 4 bytes each | |
519 | * - 24-byte entries * nr (20-byte sha1 + 4-byte offset) | |
520 | * - 20-byte SHA1 of the packfile | |
521 | * - 20-byte SHA1 file checksum | |
522 | */ | |
523 | if (idx_size != 4*256 + nr * 24 + 20 + 20) { | |
524 | munmap(idx_map, idx_size); | |
eef427a0 | 525 | return error("wrong index v1 file size in %s", path); |
74e34e1f NP |
526 | } |
527 | } else if (version == 2) { | |
528 | /* | |
529 | * Minimum size: | |
530 | * - 8 bytes of header | |
531 | * - 256 index entries 4 bytes each | |
532 | * - 20-byte sha1 entry * nr | |
533 | * - 4-byte crc entry * nr | |
534 | * - 4-byte offset entry * nr | |
535 | * - 20-byte SHA1 of the packfile | |
536 | * - 20-byte SHA1 file checksum | |
537 | * And after the 4-byte offset table might be a | |
538 | * variable sized table containing 8-byte entries | |
539 | * for offsets larger than 2^31. | |
540 | */ | |
541 | unsigned long min_size = 8 + 4*256 + nr*(20 + 4 + 4) + 20 + 20; | |
1164f1e4 LT |
542 | unsigned long max_size = min_size; |
543 | if (nr) | |
544 | max_size += (nr - 1)*8; | |
545 | if (idx_size < min_size || idx_size > max_size) { | |
74e34e1f | 546 | munmap(idx_map, idx_size); |
eef427a0 | 547 | return error("wrong index v2 file size in %s", path); |
74e34e1f | 548 | } |
7109c889 JH |
549 | if (idx_size != min_size && |
550 | /* | |
551 | * make sure we can deal with large pack offsets. | |
552 | * 31-bit signed offset won't be enough, neither | |
553 | * 32-bit unsigned one will be. | |
554 | */ | |
555 | (sizeof(off_t) <= 4)) { | |
556 | munmap(idx_map, idx_size); | |
557 | return error("pack too large for current definition of off_t in %s", path); | |
74e34e1f | 558 | } |
2d88451b | 559 | } |
1f688557 | 560 | |
74e34e1f | 561 | p->index_version = version; |
42873078 NP |
562 | p->index_data = idx_map; |
563 | p->index_size = idx_size; | |
57059091 | 564 | p->num_objects = nr; |
1f688557 JH |
565 | return 0; |
566 | } | |
567 | ||
bc8e478a | 568 | int open_pack_index(struct packed_git *p) |
d079837e SP |
569 | { |
570 | char *idx_name; | |
571 | int ret; | |
572 | ||
573 | if (p->index_data) | |
574 | return 0; | |
575 | ||
576 | idx_name = xstrdup(p->pack_name); | |
577 | strcpy(idx_name + strlen(idx_name) - strlen(".pack"), ".idx"); | |
578 | ret = check_packed_git_idx(idx_name, p); | |
579 | free(idx_name); | |
580 | return ret; | |
581 | } | |
582 | ||
11daf39b SP |
583 | static void scan_windows(struct packed_git *p, |
584 | struct packed_git **lru_p, | |
585 | struct pack_window **lru_w, | |
586 | struct pack_window **lru_l) | |
1f688557 | 587 | { |
11daf39b SP |
588 | struct pack_window *w, *w_l; |
589 | ||
590 | for (w_l = NULL, w = p->windows; w; w = w->next) { | |
591 | if (!w->inuse_cnt) { | |
592 | if (!*lru_w || w->last_used < (*lru_w)->last_used) { | |
593 | *lru_p = p; | |
594 | *lru_w = w; | |
595 | *lru_l = w_l; | |
54044bf8 | 596 | } |
54044bf8 | 597 | } |
11daf39b | 598 | w_l = w; |
f9253394 | 599 | } |
11daf39b SP |
600 | } |
601 | ||
d1efefa4 | 602 | static int unuse_one_window(struct packed_git *current, int keep_fd) |
11daf39b SP |
603 | { |
604 | struct packed_git *p, *lru_p = NULL; | |
605 | struct pack_window *lru_w = NULL, *lru_l = NULL; | |
606 | ||
607 | if (current) | |
608 | scan_windows(current, &lru_p, &lru_w, &lru_l); | |
609 | for (p = packed_git; p; p = p->next) | |
610 | scan_windows(p, &lru_p, &lru_w, &lru_l); | |
54044bf8 SP |
611 | if (lru_p) { |
612 | munmap(lru_w->base, lru_w->len); | |
613 | pack_mapped -= lru_w->len; | |
614 | if (lru_l) | |
615 | lru_l->next = lru_w->next; | |
616 | else { | |
617 | lru_p->windows = lru_w->next; | |
d1efefa4 | 618 | if (!lru_p->windows && lru_p->pack_fd != keep_fd) { |
54044bf8 SP |
619 | close(lru_p->pack_fd); |
620 | lru_p->pack_fd = -1; | |
621 | } | |
622 | } | |
623 | free(lru_w); | |
a53128b6 | 624 | pack_open_windows--; |
54044bf8 SP |
625 | return 1; |
626 | } | |
627 | return 0; | |
f9253394 JH |
628 | } |
629 | ||
d1efefa4 | 630 | void release_pack_memory(size_t need, int fd) |
97bfeb34 SP |
631 | { |
632 | size_t cur = pack_mapped; | |
d1efefa4 | 633 | while (need >= (cur - pack_mapped) && unuse_one_window(NULL, fd)) |
97bfeb34 SP |
634 | ; /* nothing */ |
635 | } | |
636 | ||
c9ced051 SP |
637 | void close_pack_windows(struct packed_git *p) |
638 | { | |
639 | while (p->windows) { | |
640 | struct pack_window *w = p->windows; | |
641 | ||
642 | if (w->inuse_cnt) | |
643 | die("pack '%s' still has open windows to it", | |
644 | p->pack_name); | |
645 | munmap(w->base, w->len); | |
646 | pack_mapped -= w->len; | |
647 | pack_open_windows--; | |
648 | p->windows = w->next; | |
649 | free(w); | |
650 | } | |
651 | } | |
652 | ||
03e79c88 | 653 | void unuse_pack(struct pack_window **w_cursor) |
f9253394 | 654 | { |
03e79c88 SP |
655 | struct pack_window *w = *w_cursor; |
656 | if (w) { | |
657 | w->inuse_cnt--; | |
658 | *w_cursor = NULL; | |
659 | } | |
1f688557 JH |
660 | } |
661 | ||
3cf8b462 SP |
662 | /* |
663 | * Do not call this directly as this leaks p->pack_fd on error return; | |
664 | * call open_packed_git() instead. | |
665 | */ | |
666 | static int open_packed_git_1(struct packed_git *p) | |
1f688557 | 667 | { |
9bc879c1 SP |
668 | struct stat st; |
669 | struct pack_header hdr; | |
670 | unsigned char sha1[20]; | |
671 | unsigned char *idx_sha1; | |
2c039da8 | 672 | long fd_flag; |
9bc879c1 | 673 | |
d079837e SP |
674 | if (!p->index_data && open_pack_index(p)) |
675 | return error("packfile %s index unavailable", p->pack_name); | |
676 | ||
9bc879c1 SP |
677 | p->pack_fd = open(p->pack_name, O_RDONLY); |
678 | if (p->pack_fd < 0 || fstat(p->pack_fd, &st)) | |
072db278 | 679 | return -1; |
9bc879c1 SP |
680 | |
681 | /* If we created the struct before we had the pack we lack size. */ | |
bf592c50 | 682 | if (!p->pack_size) { |
bf592c50 | 683 | if (!S_ISREG(st.st_mode)) |
072db278 | 684 | return error("packfile %s not a regular file", p->pack_name); |
bf592c50 | 685 | p->pack_size = st.st_size; |
9bc879c1 | 686 | } else if (p->pack_size != st.st_size) |
072db278 | 687 | return error("packfile %s size changed", p->pack_name); |
9bc879c1 | 688 | |
2c039da8 JH |
689 | /* We leave these file descriptors open with sliding mmap; |
690 | * there is no point keeping them open across exec(), though. | |
691 | */ | |
692 | fd_flag = fcntl(p->pack_fd, F_GETFD, 0); | |
693 | if (fd_flag < 0) | |
072db278 | 694 | return error("cannot determine file descriptor flags"); |
2c039da8 JH |
695 | fd_flag |= FD_CLOEXEC; |
696 | if (fcntl(p->pack_fd, F_SETFD, fd_flag) == -1) | |
072db278 | 697 | return error("cannot set FD_CLOEXEC"); |
2c039da8 | 698 | |
9bc879c1 | 699 | /* Verify we recognize this pack file format. */ |
e6e2bd62 | 700 | if (read_in_full(p->pack_fd, &hdr, sizeof(hdr)) != sizeof(hdr)) |
072db278 | 701 | return error("file %s is far too short to be a packfile", p->pack_name); |
9bc879c1 | 702 | if (hdr.hdr_signature != htonl(PACK_SIGNATURE)) |
072db278 | 703 | return error("file %s is not a GIT packfile", p->pack_name); |
9bc879c1 | 704 | if (!pack_version_ok(hdr.hdr_version)) |
6e1c2344 RJ |
705 | return error("packfile %s is version %"PRIu32" and not" |
706 | " supported (try upgrading GIT to a newer version)", | |
9bc879c1 SP |
707 | p->pack_name, ntohl(hdr.hdr_version)); |
708 | ||
709 | /* Verify the pack matches its index. */ | |
57059091 | 710 | if (p->num_objects != ntohl(hdr.hdr_entries)) |
6e1c2344 RJ |
711 | return error("packfile %s claims to have %"PRIu32" objects" |
712 | " while index indicates %"PRIu32" objects", | |
57059091 NP |
713 | p->pack_name, ntohl(hdr.hdr_entries), |
714 | p->num_objects); | |
9bc879c1 | 715 | if (lseek(p->pack_fd, p->pack_size - sizeof(sha1), SEEK_SET) == -1) |
072db278 | 716 | return error("end of packfile %s is unavailable", p->pack_name); |
e6e2bd62 | 717 | if (read_in_full(p->pack_fd, sha1, sizeof(sha1)) != sizeof(sha1)) |
072db278 | 718 | return error("packfile %s signature is unavailable", p->pack_name); |
42873078 | 719 | idx_sha1 = ((unsigned char *)p->index_data) + p->index_size - 40; |
9bc879c1 | 720 | if (hashcmp(sha1, idx_sha1)) |
072db278 SP |
721 | return error("packfile %s does not match index", p->pack_name); |
722 | return 0; | |
9bc879c1 SP |
723 | } |
724 | ||
3cf8b462 SP |
725 | static int open_packed_git(struct packed_git *p) |
726 | { | |
727 | if (!open_packed_git_1(p)) | |
728 | return 0; | |
729 | if (p->pack_fd != -1) { | |
730 | close(p->pack_fd); | |
731 | p->pack_fd = -1; | |
732 | } | |
733 | return -1; | |
734 | } | |
735 | ||
c4001d92 | 736 | static int in_window(struct pack_window *win, off_t offset) |
60bb8b14 SP |
737 | { |
738 | /* We must promise at least 20 bytes (one hash) after the | |
739 | * offset is available from this window, otherwise the offset | |
740 | * is not actually in this window and a different window (which | |
741 | * has that one hash excess) must be used. This is to support | |
742 | * the object header and delta base parsing routines below. | |
743 | */ | |
744 | off_t win_off = win->offset; | |
745 | return win_off <= offset | |
746 | && (offset + 20) <= (win_off + win->len); | |
747 | } | |
748 | ||
03e79c88 SP |
749 | unsigned char* use_pack(struct packed_git *p, |
750 | struct pack_window **w_cursor, | |
c4001d92 | 751 | off_t offset, |
03e79c88 | 752 | unsigned int *left) |
9bc879c1 | 753 | { |
60bb8b14 | 754 | struct pack_window *win = *w_cursor; |
03e79c88 | 755 | |
072db278 SP |
756 | if (p->pack_fd == -1 && open_packed_git(p)) |
757 | die("packfile %s cannot be accessed", p->pack_name); | |
60bb8b14 SP |
758 | |
759 | /* Since packfiles end in a hash of their content and its | |
760 | * pointless to ask for an offset into the middle of that | |
761 | * hash, and the in_window function above wouldn't match | |
762 | * don't allow an offset too close to the end of the file. | |
763 | */ | |
764 | if (offset > (p->pack_size - 20)) | |
765 | die("offset beyond end of packfile (truncated pack?)"); | |
766 | ||
767 | if (!win || !in_window(win, offset)) { | |
768 | if (win) | |
769 | win->inuse_cnt--; | |
770 | for (win = p->windows; win; win = win->next) { | |
771 | if (in_window(win, offset)) | |
772 | break; | |
773 | } | |
774 | if (!win) { | |
78a28df9 | 775 | size_t window_align = packed_git_window_size / 2; |
dc49cd76 | 776 | off_t len; |
60bb8b14 | 777 | win = xcalloc(1, sizeof(*win)); |
78a28df9 | 778 | win->offset = (offset / window_align) * window_align; |
dc49cd76 SP |
779 | len = p->pack_size - win->offset; |
780 | if (len > packed_git_window_size) | |
781 | len = packed_git_window_size; | |
782 | win->len = (size_t)len; | |
60bb8b14 | 783 | pack_mapped += win->len; |
11daf39b | 784 | while (packed_git_limit < pack_mapped |
d1efefa4 | 785 | && unuse_one_window(p, p->pack_fd)) |
60bb8b14 | 786 | ; /* nothing */ |
c4712e45 | 787 | win->base = xmmap(NULL, win->len, |
60bb8b14 SP |
788 | PROT_READ, MAP_PRIVATE, |
789 | p->pack_fd, win->offset); | |
790 | if (win->base == MAP_FAILED) | |
73b4e4be SP |
791 | die("packfile %s cannot be mapped: %s", |
792 | p->pack_name, | |
793 | strerror(errno)); | |
a53128b6 SP |
794 | pack_mmap_calls++; |
795 | pack_open_windows++; | |
796 | if (pack_mapped > peak_pack_mapped) | |
797 | peak_pack_mapped = pack_mapped; | |
798 | if (pack_open_windows > peak_pack_open_windows) | |
799 | peak_pack_open_windows = pack_open_windows; | |
60bb8b14 SP |
800 | win->next = p->windows; |
801 | p->windows = win; | |
802 | } | |
1f688557 | 803 | } |
03e79c88 SP |
804 | if (win != *w_cursor) { |
805 | win->last_used = pack_used_ctr++; | |
806 | win->inuse_cnt++; | |
807 | *w_cursor = win; | |
808 | } | |
60bb8b14 | 809 | offset -= win->offset; |
03e79c88 | 810 | if (left) |
dc49cd76 | 811 | *left = win->len - xsize_t(offset); |
03e79c88 | 812 | return win->base + offset; |
1f688557 JH |
813 | } |
814 | ||
27d69a46 NP |
815 | static struct packed_git *alloc_packed_git(int extra) |
816 | { | |
817 | struct packed_git *p = xmalloc(sizeof(*p) + extra); | |
818 | memset(p, 0, sizeof(*p)); | |
819 | p->pack_fd = -1; | |
820 | return p; | |
821 | } | |
822 | ||
42873078 | 823 | struct packed_git *add_packed_git(const char *path, int path_len, int local) |
1f688557 JH |
824 | { |
825 | struct stat st; | |
27d69a46 | 826 | struct packed_git *p = alloc_packed_git(path_len + 2); |
1f688557 | 827 | |
42873078 NP |
828 | /* |
829 | * Make sure a corresponding .pack file exists and that | |
830 | * the index looks sane. | |
831 | */ | |
832 | path_len -= strlen(".idx"); | |
27d69a46 NP |
833 | if (path_len < 1) { |
834 | free(p); | |
1f688557 | 835 | return NULL; |
27d69a46 | 836 | } |
42873078 | 837 | memcpy(p->pack_name, path, path_len); |
8d25931d BC |
838 | |
839 | strcpy(p->pack_name + path_len, ".keep"); | |
840 | if (!access(p->pack_name, F_OK)) | |
841 | p->pack_keep = 1; | |
842 | ||
42873078 | 843 | strcpy(p->pack_name + path_len, ".pack"); |
d079837e | 844 | if (stat(p->pack_name, &st) || !S_ISREG(st.st_mode)) { |
42873078 | 845 | free(p); |
1f688557 JH |
846 | return NULL; |
847 | } | |
42873078 | 848 | |
1f688557 JH |
849 | /* ok, it looks sane as far as we can check without |
850 | * actually mapping the pack file. | |
851 | */ | |
1f688557 | 852 | p->pack_size = st.st_size; |
9d835df2 | 853 | p->pack_local = local; |
b867092f | 854 | p->mtime = st.st_mtime; |
42873078 NP |
855 | if (path_len < 40 || get_sha1_hex(path + path_len - 40, p->sha1)) |
856 | hashclr(p->sha1); | |
1f688557 JH |
857 | return p; |
858 | } | |
859 | ||
bf592c50 | 860 | struct packed_git *parse_pack_index(unsigned char *sha1) |
c508df5e | 861 | { |
79c6dca4 | 862 | const char *idx_path = sha1_pack_index_name(sha1); |
42873078 | 863 | const char *path = sha1_pack_name(sha1); |
27d69a46 | 864 | struct packed_git *p = alloc_packed_git(strlen(path) + 1); |
bf592c50 | 865 | |
27d69a46 NP |
866 | strcpy(p->pack_name, path); |
867 | hashcpy(p->sha1, sha1); | |
42873078 NP |
868 | if (check_packed_git_idx(idx_path, p)) { |
869 | free(p); | |
bf592c50 | 870 | return NULL; |
42873078 | 871 | } |
bf592c50 | 872 | |
bf592c50 DB |
873 | return p; |
874 | } | |
875 | ||
876 | void install_packed_git(struct packed_git *pack) | |
877 | { | |
878 | pack->next = packed_git; | |
879 | packed_git = pack; | |
880 | } | |
881 | ||
9d835df2 | 882 | static void prepare_packed_git_one(char *objdir, int local) |
1f688557 | 883 | { |
9cb18f56 JM |
884 | /* Ensure that this buffer is large enough so that we can |
885 | append "/pack/" without clobbering the stack even if | |
886 | strlen(objdir) were PATH_MAX. */ | |
887 | char path[PATH_MAX + 1 + 4 + 1 + 1]; | |
1f688557 JH |
888 | int len; |
889 | DIR *dir; | |
890 | struct dirent *de; | |
891 | ||
892 | sprintf(path, "%s/pack", objdir); | |
893 | len = strlen(path); | |
894 | dir = opendir(path); | |
b5b16990 | 895 | if (!dir) { |
26125f6b | 896 | if (errno != ENOENT) |
bd2afde8 | 897 | error("unable to open object pack directory: %s: %s", |
26125f6b | 898 | path, strerror(errno)); |
1f688557 | 899 | return; |
b5b16990 | 900 | } |
1f688557 JH |
901 | path[len++] = '/'; |
902 | while ((de = readdir(dir)) != NULL) { | |
903 | int namelen = strlen(de->d_name); | |
904 | struct packed_git *p; | |
905 | ||
5bb1cda5 | 906 | if (!has_extension(de->d_name, ".idx")) |
1f688557 JH |
907 | continue; |
908 | ||
9cb18f56 JM |
909 | if (len + namelen + 1 > sizeof(path)) |
910 | continue; | |
911 | ||
54a15a8d | 912 | /* Don't reopen a pack we already have. */ |
1f688557 | 913 | strcpy(path + len, de->d_name); |
86f7780c JK |
914 | for (p = packed_git; p; p = p->next) { |
915 | if (!memcmp(path, p->pack_name, len + namelen - 4)) | |
916 | break; | |
917 | } | |
918 | if (p) | |
919 | continue; | |
54a15a8d SP |
920 | /* See if it really is a valid .idx file with corresponding |
921 | * .pack file that we can map. | |
922 | */ | |
9d835df2 | 923 | p = add_packed_git(path, len + namelen, local); |
1f688557 JH |
924 | if (!p) |
925 | continue; | |
625e9421 | 926 | install_packed_git(p); |
1f688557 | 927 | } |
5b35bcd5 | 928 | closedir(dir); |
1f688557 JH |
929 | } |
930 | ||
b867092f JH |
931 | static int sort_pack(const void *a_, const void *b_) |
932 | { | |
933 | struct packed_git *a = *((struct packed_git **)a_); | |
934 | struct packed_git *b = *((struct packed_git **)b_); | |
935 | int st; | |
936 | ||
937 | /* | |
938 | * Local packs tend to contain objects specific to our | |
939 | * variant of the project than remote ones. In addition, | |
940 | * remote ones could be on a network mounted filesystem. | |
941 | * Favor local ones for these reasons. | |
942 | */ | |
943 | st = a->pack_local - b->pack_local; | |
944 | if (st) | |
945 | return -st; | |
946 | ||
947 | /* | |
948 | * Younger packs tend to contain more recent objects, | |
949 | * and more recent objects tend to get accessed more | |
950 | * often. | |
951 | */ | |
952 | if (a->mtime < b->mtime) | |
953 | return 1; | |
954 | else if (a->mtime == b->mtime) | |
955 | return 0; | |
956 | return -1; | |
957 | } | |
958 | ||
959 | static void rearrange_packed_git(void) | |
960 | { | |
961 | struct packed_git **ary, *p; | |
962 | int i, n; | |
963 | ||
964 | for (n = 0, p = packed_git; p; p = p->next) | |
965 | n++; | |
966 | if (n < 2) | |
967 | return; | |
968 | ||
969 | /* prepare an array of packed_git for easier sorting */ | |
970 | ary = xcalloc(n, sizeof(struct packed_git *)); | |
971 | for (n = 0, p = packed_git; p; p = p->next) | |
972 | ary[n++] = p; | |
973 | ||
974 | qsort(ary, n, sizeof(struct packed_git *), sort_pack); | |
975 | ||
976 | /* link them back again */ | |
977 | for (i = 0; i < n - 1; i++) | |
978 | ary[i]->next = ary[i + 1]; | |
979 | ary[n - 1]->next = NULL; | |
980 | packed_git = ary[0]; | |
981 | ||
982 | free(ary); | |
983 | } | |
984 | ||
637cdd9d | 985 | static int prepare_packed_git_run_once = 0; |
9a217f2a | 986 | void prepare_packed_git(void) |
1f688557 | 987 | { |
d5a63b99 | 988 | struct alternate_object_database *alt; |
1f688557 | 989 | |
637cdd9d | 990 | if (prepare_packed_git_run_once) |
1f688557 | 991 | return; |
9d835df2 | 992 | prepare_packed_git_one(get_object_directory(), 1); |
9a217f2a | 993 | prepare_alt_odb(); |
d5a63b99 | 994 | for (alt = alt_odb_list; alt; alt = alt->next) { |
1494e038 | 995 | alt->name[-1] = 0; |
9d835df2 | 996 | prepare_packed_git_one(alt->base, 0); |
1494e038 | 997 | alt->name[-1] = '/'; |
1f688557 | 998 | } |
b867092f | 999 | rearrange_packed_git(); |
637cdd9d JK |
1000 | prepare_packed_git_run_once = 1; |
1001 | } | |
1002 | ||
fc04c412 | 1003 | void reprepare_packed_git(void) |
637cdd9d | 1004 | { |
4b480c67 | 1005 | discard_revindex(); |
637cdd9d JK |
1006 | prepare_packed_git_run_once = 0; |
1007 | prepare_packed_git(); | |
1f688557 JH |
1008 | } |
1009 | ||
8eca0b47 NP |
1010 | static void mark_bad_packed_object(struct packed_git *p, |
1011 | const unsigned char *sha1) | |
1012 | { | |
1013 | unsigned i; | |
1014 | for (i = 0; i < p->num_bad_objects; i++) | |
1015 | if (!hashcmp(sha1, p->bad_object_sha1 + 20 * i)) | |
1016 | return; | |
1017 | p->bad_object_sha1 = xrealloc(p->bad_object_sha1, 20 * (p->num_bad_objects + 1)); | |
1018 | hashcpy(p->bad_object_sha1 + 20 * p->num_bad_objects, sha1); | |
1019 | p->num_bad_objects++; | |
1020 | } | |
1021 | ||
ac939109 NP |
1022 | static int has_packed_and_bad(const unsigned char *sha1) |
1023 | { | |
1024 | struct packed_git *p; | |
1025 | unsigned i; | |
1026 | ||
1027 | for (p = packed_git; p; p = p->next) | |
1028 | for (i = 0; i < p->num_bad_objects; i++) | |
1029 | if (!hashcmp(sha1, p->bad_object_sha1 + 20 * i)) | |
1030 | return 1; | |
1031 | return 0; | |
1032 | } | |
1033 | ||
5d6ccf5c | 1034 | int check_sha1_signature(const unsigned char *sha1, void *map, unsigned long size, const char *type) |
0fcfd160 LT |
1035 | { |
1036 | unsigned char real_sha1[20]; | |
7cfb5f36 | 1037 | hash_sha1_file(map, size, type, real_sha1); |
a89fccd2 | 1038 | return hashcmp(sha1, real_sha1) ? -1 : 0; |
0fcfd160 LT |
1039 | } |
1040 | ||
44d1c19e LT |
1041 | static int git_open_noatime(const char *name) |
1042 | { | |
1043 | static int sha1_file_open_flag = O_NOATIME; | |
1044 | int fd = open(name, O_RDONLY | sha1_file_open_flag); | |
1045 | ||
1046 | /* Might the failure be due to O_NOATIME? */ | |
1047 | if (fd < 0 && errno != ENOENT && sha1_file_open_flag) { | |
1048 | fd = open(name, O_RDONLY); | |
1049 | if (fd >= 0) | |
1050 | sha1_file_open_flag = 0; | |
1051 | } | |
1052 | return fd; | |
1053 | } | |
1054 | ||
1055 | static int open_sha1_file(const unsigned char *sha1) | |
1056 | { | |
1057 | int fd; | |
1058 | char *name = sha1_file_name(sha1); | |
1059 | struct alternate_object_database *alt; | |
1060 | ||
1061 | fd = git_open_noatime(name); | |
1062 | if (fd >= 0) | |
1063 | return fd; | |
1064 | ||
1065 | prepare_alt_odb(); | |
1066 | errno = ENOENT; | |
1067 | for (alt = alt_odb_list; alt; alt = alt->next) { | |
1068 | name = alt->name; | |
1069 | fill_sha1_path(name, sha1); | |
1070 | fd = git_open_noatime(alt->base); | |
1071 | if (fd >= 0) | |
1072 | return fd; | |
1073 | } | |
1074 | return -1; | |
1075 | } | |
1076 | ||
4175e9e3 | 1077 | static void *map_sha1_file(const unsigned char *sha1, unsigned long *size) |
0fcfd160 | 1078 | { |
0fcfd160 | 1079 | void *map; |
144bde78 | 1080 | int fd; |
ace1534d | 1081 | |
44d1c19e LT |
1082 | fd = open_sha1_file(sha1); |
1083 | map = NULL; | |
1084 | if (fd >= 0) { | |
1085 | struct stat st; | |
0fcfd160 | 1086 | |
44d1c19e LT |
1087 | if (!fstat(fd, &st)) { |
1088 | *size = xsize_t(st.st_size); | |
1089 | map = xmmap(NULL, *size, PROT_READ, MAP_PRIVATE, fd, 0); | |
144bde78 | 1090 | } |
44d1c19e | 1091 | close(fd); |
0fcfd160 | 1092 | } |
0fcfd160 LT |
1093 | return map; |
1094 | } | |
1095 | ||
726f852b | 1096 | static int legacy_loose_object(unsigned char *map) |
bb6b8e4f JH |
1097 | { |
1098 | unsigned int word; | |
1099 | ||
1100 | /* | |
1101 | * Is it a zlib-compressed buffer? If so, the first byte | |
1102 | * must be 0x78 (15-bit window size, deflated), and the | |
1103 | * first 16-bit word is evenly divisible by 31 | |
1104 | */ | |
1105 | word = (map[0] << 8) + map[1]; | |
1106 | if (map[0] == 0x78 && !(word % 31)) | |
1107 | return 1; | |
1108 | else | |
1109 | return 0; | |
1110 | } | |
1111 | ||
72518e9c | 1112 | unsigned long unpack_object_header_gently(const unsigned char *buf, unsigned long len, enum object_type *type, unsigned long *sizep) |
c4483576 | 1113 | { |
ad1ed5ee | 1114 | unsigned shift; |
93821bd9 | 1115 | unsigned char c; |
93821bd9 | 1116 | unsigned long size; |
ad1ed5ee JH |
1117 | unsigned long used = 0; |
1118 | ||
1119 | c = buf[used++]; | |
1120 | *type = (c >> 4) & 7; | |
1121 | size = c & 15; | |
1122 | shift = 4; | |
1123 | while (c & 0x80) { | |
1124 | if (len <= used) | |
1125 | return 0; | |
1126 | if (sizeof(long) * 8 <= shift) | |
1127 | return 0; | |
1128 | c = buf[used++]; | |
1129 | size += (c & 0x7f) << shift; | |
1130 | shift += 7; | |
1131 | } | |
1132 | *sizep = size; | |
1133 | return used; | |
1134 | } | |
1135 | ||
1136 | static int unpack_sha1_header(z_stream *stream, unsigned char *map, unsigned long mapsize, void *buffer, unsigned long bufsiz) | |
1137 | { | |
1138 | unsigned long size, used; | |
1139 | static const char valid_loose_object_type[8] = { | |
1140 | 0, /* OBJ_EXT */ | |
1141 | 1, 1, 1, 1, /* "commit", "tree", "blob", "tag" */ | |
1142 | 0, /* "delta" and others are invalid in a loose object */ | |
93821bd9 | 1143 | }; |
ad1ed5ee | 1144 | enum object_type type; |
93821bd9 | 1145 | |
c4483576 LT |
1146 | /* Get the data stream */ |
1147 | memset(stream, 0, sizeof(*stream)); | |
1148 | stream->next_in = map; | |
1149 | stream->avail_in = mapsize; | |
1150 | stream->next_out = buffer; | |
93821bd9 LT |
1151 | stream->avail_out = bufsiz; |
1152 | ||
bb6b8e4f | 1153 | if (legacy_loose_object(map)) { |
93821bd9 LT |
1154 | inflateInit(stream); |
1155 | return inflate(stream, 0); | |
1156 | } | |
1157 | ||
726f852b NP |
1158 | |
1159 | /* | |
1160 | * There used to be a second loose object header format which | |
1161 | * was meant to mimic the in-pack format, allowing for direct | |
1162 | * copy of the object data. This format turned up not to be | |
1163 | * really worth it and we don't write it any longer. But we | |
1164 | * can still read it. | |
1165 | */ | |
ad1ed5ee JH |
1166 | used = unpack_object_header_gently(map, mapsize, &type, &size); |
1167 | if (!used || !valid_loose_object_type[type]) | |
93821bd9 | 1168 | return -1; |
ad1ed5ee JH |
1169 | map += used; |
1170 | mapsize -= used; | |
93821bd9 LT |
1171 | |
1172 | /* Set up the stream for the rest.. */ | |
1173 | stream->next_in = map; | |
1174 | stream->avail_in = mapsize; | |
c4483576 | 1175 | inflateInit(stream); |
93821bd9 LT |
1176 | |
1177 | /* And generate the fake traditional header */ | |
ad1ed5ee | 1178 | stream->total_out = 1 + snprintf(buffer, bufsiz, "%s %lu", |
df843662 | 1179 | typename(type), size); |
93821bd9 | 1180 | return 0; |
c4483576 LT |
1181 | } |
1182 | ||
7efbff75 | 1183 | static void *unpack_sha1_rest(z_stream *stream, void *buffer, unsigned long size, const unsigned char *sha1) |
5180cacc LT |
1184 | { |
1185 | int bytes = strlen(buffer) + 1; | |
d565b341 | 1186 | unsigned char *buf = xmalloc(1+size); |
93821bd9 | 1187 | unsigned long n; |
7efbff75 | 1188 | int status = Z_OK; |
5180cacc | 1189 | |
93821bd9 LT |
1190 | n = stream->total_out - bytes; |
1191 | if (n > size) | |
1192 | n = size; | |
1193 | memcpy(buf, (char *) buffer + bytes, n); | |
1194 | bytes = n; | |
456cdf6e LT |
1195 | if (bytes <= size) { |
1196 | /* | |
1197 | * The above condition must be (bytes <= size), not | |
1198 | * (bytes < size). In other words, even though we | |
1199 | * expect no more output and set avail_out to zer0, | |
1200 | * the input zlib stream may have bytes that express | |
1201 | * "this concludes the stream", and we *do* want to | |
1202 | * eat that input. | |
1203 | * | |
1204 | * Otherwise we would not be able to test that we | |
1205 | * consumed all the input to reach the expected size; | |
1206 | * we also want to check that zlib tells us that all | |
1207 | * went well with status == Z_STREAM_END at the end. | |
1208 | */ | |
5180cacc LT |
1209 | stream->next_out = buf + bytes; |
1210 | stream->avail_out = size - bytes; | |
7efbff75 JH |
1211 | while (status == Z_OK) |
1212 | status = inflate(stream, Z_FINISH); | |
5180cacc LT |
1213 | } |
1214 | buf[size] = 0; | |
456cdf6e | 1215 | if (status == Z_STREAM_END && !stream->avail_in) { |
7efbff75 JH |
1216 | inflateEnd(stream); |
1217 | return buf; | |
1218 | } | |
1219 | ||
1220 | if (status < 0) | |
1221 | error("corrupt loose object '%s'", sha1_to_hex(sha1)); | |
1222 | else if (stream->avail_in) | |
1223 | error("garbage at end of loose object '%s'", | |
1224 | sha1_to_hex(sha1)); | |
1225 | free(buf); | |
1226 | return NULL; | |
5180cacc LT |
1227 | } |
1228 | ||
1229 | /* | |
1230 | * We used to just use "sscanf()", but that's actually way | |
1231 | * too permissive for what we want to check. So do an anal | |
1232 | * object header parse by hand. | |
1233 | */ | |
21666f1a | 1234 | static int parse_sha1_header(const char *hdr, unsigned long *sizep) |
5180cacc | 1235 | { |
21666f1a | 1236 | char type[10]; |
5180cacc LT |
1237 | int i; |
1238 | unsigned long size; | |
1239 | ||
1240 | /* | |
a6080a0a | 1241 | * The type can be at most ten bytes (including the |
5180cacc | 1242 | * terminating '\0' that we add), and is followed by |
21666f1a | 1243 | * a space. |
5180cacc | 1244 | */ |
21666f1a | 1245 | i = 0; |
5180cacc LT |
1246 | for (;;) { |
1247 | char c = *hdr++; | |
1248 | if (c == ' ') | |
1249 | break; | |
21666f1a NP |
1250 | type[i++] = c; |
1251 | if (i >= sizeof(type)) | |
5180cacc | 1252 | return -1; |
5180cacc | 1253 | } |
21666f1a | 1254 | type[i] = 0; |
5180cacc LT |
1255 | |
1256 | /* | |
1257 | * The length must follow immediately, and be in canonical | |
1258 | * decimal format (ie "010" is not valid). | |
1259 | */ | |
1260 | size = *hdr++ - '0'; | |
1261 | if (size > 9) | |
1262 | return -1; | |
1263 | if (size) { | |
1264 | for (;;) { | |
1265 | unsigned long c = *hdr - '0'; | |
1266 | if (c > 9) | |
1267 | break; | |
1268 | hdr++; | |
1269 | size = size * 10 + c; | |
1270 | } | |
1271 | } | |
1272 | *sizep = size; | |
1273 | ||
1274 | /* | |
1275 | * The length must be followed by a zero byte | |
1276 | */ | |
21666f1a | 1277 | return *hdr ? -1 : type_from_string(type); |
5180cacc LT |
1278 | } |
1279 | ||
7efbff75 | 1280 | static void *unpack_sha1_file(void *map, unsigned long mapsize, enum object_type *type, unsigned long *size, const unsigned char *sha1) |
0fcfd160 | 1281 | { |
5180cacc | 1282 | int ret; |
0fcfd160 | 1283 | z_stream stream; |
5180cacc | 1284 | char hdr[8192]; |
0fcfd160 | 1285 | |
5180cacc | 1286 | ret = unpack_sha1_header(&stream, map, mapsize, hdr, sizeof(hdr)); |
21666f1a | 1287 | if (ret < Z_OK || (*type = parse_sha1_header(hdr, size)) < 0) |
0fcfd160 LT |
1288 | return NULL; |
1289 | ||
7efbff75 | 1290 | return unpack_sha1_rest(&stream, hdr, *size, sha1); |
0fcfd160 LT |
1291 | } |
1292 | ||
54dab52a NP |
1293 | unsigned long get_size_from_delta(struct packed_git *p, |
1294 | struct pack_window **w_curs, | |
1295 | off_t curpos) | |
1296 | { | |
1297 | const unsigned char *data; | |
1298 | unsigned char delta_head[20], *in; | |
1299 | z_stream stream; | |
1300 | int st; | |
1301 | ||
1302 | memset(&stream, 0, sizeof(stream)); | |
1303 | stream.next_out = delta_head; | |
1304 | stream.avail_out = sizeof(delta_head); | |
1305 | ||
1306 | inflateInit(&stream); | |
1307 | do { | |
1308 | in = use_pack(p, w_curs, curpos, &stream.avail_in); | |
1309 | stream.next_in = in; | |
1310 | st = inflate(&stream, Z_FINISH); | |
1311 | curpos += stream.next_in - in; | |
1312 | } while ((st == Z_OK || st == Z_BUF_ERROR) && | |
1313 | stream.total_out < sizeof(delta_head)); | |
1314 | inflateEnd(&stream); | |
1315 | if ((st != Z_STREAM_END) && stream.total_out != sizeof(delta_head)) | |
1316 | die("delta data unpack-initial failed"); | |
1317 | ||
1318 | /* Examine the initial part of the delta to figure out | |
1319 | * the result size. | |
1320 | */ | |
1321 | data = delta_head; | |
1322 | ||
1323 | /* ignore base size */ | |
1324 | get_delta_hdr_size(&data, delta_head+sizeof(delta_head)); | |
1325 | ||
1326 | /* Read the result size */ | |
1327 | return get_delta_hdr_size(&data, delta_head+sizeof(delta_head)); | |
1328 | } | |
1329 | ||
c4001d92 | 1330 | static off_t get_delta_base(struct packed_git *p, |
03e79c88 | 1331 | struct pack_window **w_curs, |
c4001d92 | 1332 | off_t *curpos, |
21666f1a | 1333 | enum object_type type, |
c4001d92 | 1334 | off_t delta_obj_offset) |
eb32d236 | 1335 | { |
2b87c45b | 1336 | unsigned char *base_info = use_pack(p, w_curs, *curpos, NULL); |
c4001d92 | 1337 | off_t base_offset; |
eb32d236 | 1338 | |
8d8a4ea5 SP |
1339 | /* use_pack() assured us we have [base_info, base_info + 20) |
1340 | * as a range that we can look at without walking off the | |
1341 | * end of the mapped window. Its actually the hash size | |
1342 | * that is assured. An OFS_DELTA longer than the hash size | |
1343 | * is stupid, as then a REF_DELTA would be smaller to store. | |
1344 | */ | |
21666f1a | 1345 | if (type == OBJ_OFS_DELTA) { |
eb32d236 NP |
1346 | unsigned used = 0; |
1347 | unsigned char c = base_info[used++]; | |
1348 | base_offset = c & 127; | |
1349 | while (c & 128) { | |
1350 | base_offset += 1; | |
8723f216 | 1351 | if (!base_offset || MSB(base_offset, 7)) |
8eca0b47 | 1352 | return 0; /* overflow */ |
eb32d236 NP |
1353 | c = base_info[used++]; |
1354 | base_offset = (base_offset << 7) + (c & 127); | |
1355 | } | |
1356 | base_offset = delta_obj_offset - base_offset; | |
1357 | if (base_offset >= delta_obj_offset) | |
8eca0b47 | 1358 | return 0; /* out of bound */ |
2b87c45b | 1359 | *curpos += used; |
21666f1a | 1360 | } else if (type == OBJ_REF_DELTA) { |
eb32d236 NP |
1361 | /* The base entry _must_ be in the same pack */ |
1362 | base_offset = find_pack_entry_one(base_info, p); | |
2b87c45b | 1363 | *curpos += 20; |
eb32d236 NP |
1364 | } else |
1365 | die("I am totally screwed"); | |
2b87c45b | 1366 | return base_offset; |
eb32d236 NP |
1367 | } |
1368 | ||
f3bf9224 | 1369 | /* forward declaration for a mutually recursive function */ |
c4001d92 | 1370 | static int packed_object_info(struct packed_git *p, off_t offset, |
21666f1a | 1371 | unsigned long *sizep); |
f3bf9224 | 1372 | |
43057304 | 1373 | static int packed_delta_info(struct packed_git *p, |
03e79c88 | 1374 | struct pack_window **w_curs, |
c4001d92 | 1375 | off_t curpos, |
21666f1a | 1376 | enum object_type type, |
c4001d92 | 1377 | off_t obj_offset, |
43057304 | 1378 | unsigned long *sizep) |
5db47c2b | 1379 | { |
c4001d92 | 1380 | off_t base_offset; |
f3bf9224 | 1381 | |
21666f1a NP |
1382 | base_offset = get_delta_base(p, w_curs, &curpos, type, obj_offset); |
1383 | type = packed_object_info(p, base_offset, NULL); | |
f3bf9224 | 1384 | |
c62266f3 JH |
1385 | /* We choose to only get the type of the base object and |
1386 | * ignore potentially corrupt pack file that expects the delta | |
1387 | * based on a base with a wrong size. This saves tons of | |
1388 | * inflate() calls. | |
1389 | */ | |
54dab52a NP |
1390 | if (sizep) |
1391 | *sizep = get_size_from_delta(p, w_curs, curpos); | |
21666f1a NP |
1392 | |
1393 | return type; | |
5db47c2b JH |
1394 | } |
1395 | ||
2b87c45b NP |
1396 | static int unpack_object_header(struct packed_git *p, |
1397 | struct pack_window **w_curs, | |
c4001d92 | 1398 | off_t *curpos, |
2b87c45b | 1399 | unsigned long *sizep) |
a733cb60 | 1400 | { |
03e79c88 SP |
1401 | unsigned char *base; |
1402 | unsigned int left; | |
ad1ed5ee | 1403 | unsigned long used; |
2b87c45b | 1404 | enum object_type type; |
a733cb60 | 1405 | |
8d8a4ea5 SP |
1406 | /* use_pack() assures us we have [base, base + 20) available |
1407 | * as a range that we can look at at. (Its actually the hash | |
3dff5379 | 1408 | * size that is assured.) With our object header encoding |
8d8a4ea5 SP |
1409 | * the maximum deflated object size is 2^137, which is just |
1410 | * insane, so we know won't exceed what we have been given. | |
1411 | */ | |
2b87c45b NP |
1412 | base = use_pack(p, w_curs, *curpos, &left); |
1413 | used = unpack_object_header_gently(base, left, &type, sizep); | |
ad1ed5ee JH |
1414 | if (!used) |
1415 | die("object offset outside of pack file"); | |
2b87c45b | 1416 | *curpos += used; |
ad1ed5ee | 1417 | |
2b87c45b | 1418 | return type; |
a733cb60 LT |
1419 | } |
1420 | ||
21666f1a | 1421 | const char *packed_object_info_detail(struct packed_git *p, |
c4001d92 | 1422 | off_t obj_offset, |
21666f1a NP |
1423 | unsigned long *size, |
1424 | unsigned long *store_size, | |
1425 | unsigned int *delta_chain_length, | |
1426 | unsigned char *base_sha1) | |
ad8c80a5 | 1427 | { |
03e79c88 | 1428 | struct pack_window *w_curs = NULL; |
c4001d92 SP |
1429 | off_t curpos; |
1430 | unsigned long dummy; | |
43057304 | 1431 | unsigned char *next_sha1; |
21666f1a | 1432 | enum object_type type; |
70f5d5d3 | 1433 | struct revindex_entry *revidx; |
ad8c80a5 | 1434 | |
43057304 | 1435 | *delta_chain_length = 0; |
2b87c45b | 1436 | curpos = obj_offset; |
21666f1a | 1437 | type = unpack_object_header(p, &w_curs, &curpos, size); |
43057304 | 1438 | |
70f5d5d3 NP |
1439 | revidx = find_pack_revindex(p, obj_offset); |
1440 | *store_size = revidx[1].offset - obj_offset; | |
1441 | ||
43057304 | 1442 | for (;;) { |
21666f1a | 1443 | switch (type) { |
43057304 | 1444 | default: |
08a19d87 | 1445 | die("pack %s contains unknown object type %d", |
21666f1a | 1446 | p->pack_name, type); |
43057304 NP |
1447 | case OBJ_COMMIT: |
1448 | case OBJ_TREE: | |
1449 | case OBJ_BLOB: | |
1450 | case OBJ_TAG: | |
03e79c88 | 1451 | unuse_pack(&w_curs); |
21666f1a | 1452 | return typename(type); |
eb32d236 | 1453 | case OBJ_OFS_DELTA: |
21666f1a | 1454 | obj_offset = get_delta_base(p, &w_curs, &curpos, type, obj_offset); |
8eca0b47 NP |
1455 | if (!obj_offset) |
1456 | die("pack %s contains bad delta base reference of type %s", | |
1457 | p->pack_name, typename(type)); | |
eb32d236 | 1458 | if (*delta_chain_length == 0) { |
70f5d5d3 NP |
1459 | revidx = find_pack_revindex(p, obj_offset); |
1460 | hashcpy(base_sha1, nth_packed_object_sha1(p, revidx->nr)); | |
eb32d236 NP |
1461 | } |
1462 | break; | |
1463 | case OBJ_REF_DELTA: | |
2b87c45b | 1464 | next_sha1 = use_pack(p, &w_curs, curpos, NULL); |
43057304 NP |
1465 | if (*delta_chain_length == 0) |
1466 | hashcpy(base_sha1, next_sha1); | |
2b87c45b | 1467 | obj_offset = find_pack_entry_one(next_sha1, p); |
43057304 NP |
1468 | break; |
1469 | } | |
43057304 | 1470 | (*delta_chain_length)++; |
2b87c45b | 1471 | curpos = obj_offset; |
21666f1a | 1472 | type = unpack_object_header(p, &w_curs, &curpos, &dummy); |
ad8c80a5 | 1473 | } |
ad8c80a5 JH |
1474 | } |
1475 | ||
c4001d92 | 1476 | static int packed_object_info(struct packed_git *p, off_t obj_offset, |
21666f1a | 1477 | unsigned long *sizep) |
1f688557 | 1478 | { |
03e79c88 | 1479 | struct pack_window *w_curs = NULL; |
c4001d92 SP |
1480 | unsigned long size; |
1481 | off_t curpos = obj_offset; | |
21666f1a | 1482 | enum object_type type; |
5db47c2b | 1483 | |
21666f1a | 1484 | type = unpack_object_header(p, &w_curs, &curpos, &size); |
5db47c2b | 1485 | |
21666f1a | 1486 | switch (type) { |
eb32d236 NP |
1487 | case OBJ_OFS_DELTA: |
1488 | case OBJ_REF_DELTA: | |
21666f1a NP |
1489 | type = packed_delta_info(p, &w_curs, curpos, |
1490 | type, obj_offset, sizep); | |
2b87c45b | 1491 | break; |
a733cb60 | 1492 | case OBJ_COMMIT: |
a733cb60 | 1493 | case OBJ_TREE: |
a733cb60 | 1494 | case OBJ_BLOB: |
a733cb60 | 1495 | case OBJ_TAG: |
2b87c45b NP |
1496 | if (sizep) |
1497 | *sizep = size; | |
a69d0943 | 1498 | break; |
1f688557 | 1499 | default: |
08a19d87 | 1500 | die("pack %s contains unknown object type %d", |
21666f1a | 1501 | p->pack_name, type); |
1f688557 | 1502 | } |
2b87c45b | 1503 | unuse_pack(&w_curs); |
21666f1a | 1504 | return type; |
1f688557 JH |
1505 | } |
1506 | ||
eb950c19 | 1507 | static void *unpack_compressed_entry(struct packed_git *p, |
03e79c88 | 1508 | struct pack_window **w_curs, |
c4001d92 | 1509 | off_t curpos, |
eb950c19 | 1510 | unsigned long size) |
de530aaa SP |
1511 | { |
1512 | int st; | |
1513 | z_stream stream; | |
079afb18 | 1514 | unsigned char *buffer, *in; |
de530aaa SP |
1515 | |
1516 | buffer = xmalloc(size + 1); | |
1517 | buffer[size] = 0; | |
1518 | memset(&stream, 0, sizeof(stream)); | |
de530aaa SP |
1519 | stream.next_out = buffer; |
1520 | stream.avail_out = size; | |
1521 | ||
1522 | inflateInit(&stream); | |
079afb18 | 1523 | do { |
2b87c45b | 1524 | in = use_pack(p, w_curs, curpos, &stream.avail_in); |
079afb18 SP |
1525 | stream.next_in = in; |
1526 | st = inflate(&stream, Z_FINISH); | |
2b87c45b | 1527 | curpos += stream.next_in - in; |
079afb18 | 1528 | } while (st == Z_OK || st == Z_BUF_ERROR); |
de530aaa SP |
1529 | inflateEnd(&stream); |
1530 | if ((st != Z_STREAM_END) || stream.total_out != size) { | |
1531 | free(buffer); | |
1532 | return NULL; | |
1533 | } | |
1534 | ||
1535 | return buffer; | |
1536 | } | |
1537 | ||
e5e01619 LT |
1538 | #define MAX_DELTA_CACHE (256) |
1539 | ||
18bdec11 | 1540 | static size_t delta_base_cached; |
5e08ecbf NP |
1541 | |
1542 | static struct delta_base_cache_lru_list { | |
1543 | struct delta_base_cache_lru_list *prev; | |
1544 | struct delta_base_cache_lru_list *next; | |
1545 | } delta_base_cache_lru = { &delta_base_cache_lru, &delta_base_cache_lru }; | |
1546 | ||
e5e01619 | 1547 | static struct delta_base_cache_entry { |
5e08ecbf NP |
1548 | struct delta_base_cache_lru_list lru; |
1549 | void *data; | |
e5e01619 LT |
1550 | struct packed_git *p; |
1551 | off_t base_offset; | |
1552 | unsigned long size; | |
e5e01619 LT |
1553 | enum object_type type; |
1554 | } delta_base_cache[MAX_DELTA_CACHE]; | |
1555 | ||
1556 | static unsigned long pack_entry_hash(struct packed_git *p, off_t base_offset) | |
1557 | { | |
1558 | unsigned long hash; | |
1559 | ||
1560 | hash = (unsigned long)p + (unsigned long)base_offset; | |
1561 | hash += (hash >> 8) + (hash >> 16); | |
3358004a | 1562 | return hash % MAX_DELTA_CACHE; |
e5e01619 LT |
1563 | } |
1564 | ||
62f255ad | 1565 | static void *cache_or_unpack_entry(struct packed_git *p, off_t base_offset, |
a0cba108 | 1566 | unsigned long *base_size, enum object_type *type, int keep_cache) |
62f255ad | 1567 | { |
e5e01619 LT |
1568 | void *ret; |
1569 | unsigned long hash = pack_entry_hash(p, base_offset); | |
1570 | struct delta_base_cache_entry *ent = delta_base_cache + hash; | |
1571 | ||
1572 | ret = ent->data; | |
1573 | if (ret && ent->p == p && ent->base_offset == base_offset) | |
1574 | goto found_cache_entry; | |
62f255ad | 1575 | return unpack_entry(p, base_offset, type, base_size); |
e5e01619 LT |
1576 | |
1577 | found_cache_entry: | |
18bdec11 | 1578 | if (!keep_cache) { |
a0cba108 | 1579 | ent->data = NULL; |
5e08ecbf NP |
1580 | ent->lru.next->prev = ent->lru.prev; |
1581 | ent->lru.prev->next = ent->lru.next; | |
18bdec11 | 1582 | delta_base_cached -= ent->size; |
182af834 PH |
1583 | } else { |
1584 | ret = xmemdupz(ent->data, ent->size); | |
a0cba108 | 1585 | } |
e5e01619 LT |
1586 | *type = ent->type; |
1587 | *base_size = ent->size; | |
1588 | return ret; | |
62f255ad LT |
1589 | } |
1590 | ||
18bdec11 SP |
1591 | static inline void release_delta_base_cache(struct delta_base_cache_entry *ent) |
1592 | { | |
1593 | if (ent->data) { | |
1594 | free(ent->data); | |
1595 | ent->data = NULL; | |
5e08ecbf NP |
1596 | ent->lru.next->prev = ent->lru.prev; |
1597 | ent->lru.prev->next = ent->lru.next; | |
18bdec11 SP |
1598 | delta_base_cached -= ent->size; |
1599 | } | |
1600 | } | |
1601 | ||
62f255ad LT |
1602 | static void add_delta_base_cache(struct packed_git *p, off_t base_offset, |
1603 | void *base, unsigned long base_size, enum object_type type) | |
1604 | { | |
5e08ecbf | 1605 | unsigned long hash = pack_entry_hash(p, base_offset); |
e5e01619 | 1606 | struct delta_base_cache_entry *ent = delta_base_cache + hash; |
5e08ecbf | 1607 | struct delta_base_cache_lru_list *lru; |
e5e01619 | 1608 | |
18bdec11 SP |
1609 | release_delta_base_cache(ent); |
1610 | delta_base_cached += base_size; | |
5e08ecbf NP |
1611 | |
1612 | for (lru = delta_base_cache_lru.next; | |
1613 | delta_base_cached > delta_base_cache_limit | |
1614 | && lru != &delta_base_cache_lru; | |
1615 | lru = lru->next) { | |
1616 | struct delta_base_cache_entry *f = (void *)lru; | |
18bdec11 SP |
1617 | if (f->type == OBJ_BLOB) |
1618 | release_delta_base_cache(f); | |
1619 | } | |
5e08ecbf NP |
1620 | for (lru = delta_base_cache_lru.next; |
1621 | delta_base_cached > delta_base_cache_limit | |
1622 | && lru != &delta_base_cache_lru; | |
1623 | lru = lru->next) { | |
1624 | struct delta_base_cache_entry *f = (void *)lru; | |
1625 | release_delta_base_cache(f); | |
1626 | } | |
18bdec11 | 1627 | |
e5e01619 LT |
1628 | ent->p = p; |
1629 | ent->base_offset = base_offset; | |
1630 | ent->type = type; | |
1631 | ent->data = base; | |
1632 | ent->size = base_size; | |
5e08ecbf NP |
1633 | ent->lru.next = &delta_base_cache_lru; |
1634 | ent->lru.prev = delta_base_cache_lru.prev; | |
1635 | delta_base_cache_lru.prev->next = &ent->lru; | |
1636 | delta_base_cache_lru.prev = &ent->lru; | |
62f255ad LT |
1637 | } |
1638 | ||
eb950c19 | 1639 | static void *unpack_delta_entry(struct packed_git *p, |
03e79c88 | 1640 | struct pack_window **w_curs, |
c4001d92 | 1641 | off_t curpos, |
1f688557 | 1642 | unsigned long delta_size, |
c4001d92 | 1643 | off_t obj_offset, |
21666f1a | 1644 | enum object_type *type, |
eb950c19 | 1645 | unsigned long *sizep) |
1f688557 | 1646 | { |
7c3e8be3 | 1647 | void *delta_data, *result, *base; |
c4001d92 SP |
1648 | unsigned long base_size; |
1649 | off_t base_offset; | |
43057304 | 1650 | |
21666f1a | 1651 | base_offset = get_delta_base(p, w_curs, &curpos, *type, obj_offset); |
8eca0b47 NP |
1652 | if (!base_offset) { |
1653 | error("failed to validate delta base reference " | |
1654 | "at offset %"PRIuMAX" from %s", | |
1655 | (uintmax_t)curpos, p->pack_name); | |
1656 | return NULL; | |
1657 | } | |
eac12e2d | 1658 | unuse_pack(w_curs); |
a0cba108 | 1659 | base = cache_or_unpack_entry(p, base_offset, &base_size, type, 0); |
8eca0b47 NP |
1660 | if (!base) { |
1661 | /* | |
1662 | * We're probably in deep shit, but let's try to fetch | |
1663 | * the required base anyway from another pack or loose. | |
1664 | * This is costly but should happen only in the presence | |
1665 | * of a corrupted pack, and is better than failing outright. | |
1666 | */ | |
1667 | struct revindex_entry *revidx = find_pack_revindex(p, base_offset); | |
1668 | const unsigned char *base_sha1 = | |
1669 | nth_packed_object_sha1(p, revidx->nr); | |
1670 | error("failed to read delta base object %s" | |
1671 | " at offset %"PRIuMAX" from %s", | |
1672 | sha1_to_hex(base_sha1), (uintmax_t)base_offset, | |
1673 | p->pack_name); | |
1674 | mark_bad_packed_object(p, base_sha1); | |
ac939109 | 1675 | base = read_object(base_sha1, type, &base_size); |
8eca0b47 NP |
1676 | if (!base) |
1677 | return NULL; | |
1678 | } | |
67686d95 | 1679 | |
2b87c45b | 1680 | delta_data = unpack_compressed_entry(p, w_curs, curpos, delta_size); |
8eca0b47 NP |
1681 | if (!delta_data) { |
1682 | error("failed to unpack compressed delta " | |
1683 | "at offset %"PRIuMAX" from %s", | |
1684 | (uintmax_t)curpos, p->pack_name); | |
1685 | free(base); | |
1686 | return NULL; | |
1687 | } | |
1f688557 JH |
1688 | result = patch_delta(base, base_size, |
1689 | delta_data, delta_size, | |
21666f1a | 1690 | sizep); |
1f688557 JH |
1691 | if (!result) |
1692 | die("failed to apply delta"); | |
1693 | free(delta_data); | |
62f255ad | 1694 | add_delta_base_cache(p, base_offset, base, base_size, *type); |
1f688557 JH |
1695 | return result; |
1696 | } | |
1697 | ||
c4001d92 | 1698 | void *unpack_entry(struct packed_git *p, off_t obj_offset, |
21666f1a | 1699 | enum object_type *type, unsigned long *sizep) |
1f688557 | 1700 | { |
03e79c88 | 1701 | struct pack_window *w_curs = NULL; |
c4001d92 | 1702 | off_t curpos = obj_offset; |
21666f1a | 1703 | void *data; |
1f688557 | 1704 | |
21666f1a NP |
1705 | *type = unpack_object_header(p, &w_curs, &curpos, sizep); |
1706 | switch (*type) { | |
eb32d236 NP |
1707 | case OBJ_OFS_DELTA: |
1708 | case OBJ_REF_DELTA: | |
21666f1a NP |
1709 | data = unpack_delta_entry(p, &w_curs, curpos, *sizep, |
1710 | obj_offset, type, sizep); | |
4d703a1a | 1711 | break; |
a733cb60 | 1712 | case OBJ_COMMIT: |
a733cb60 | 1713 | case OBJ_TREE: |
a733cb60 | 1714 | case OBJ_BLOB: |
a733cb60 | 1715 | case OBJ_TAG: |
21666f1a | 1716 | data = unpack_compressed_entry(p, &w_curs, curpos, *sizep); |
4d703a1a | 1717 | break; |
1f688557 | 1718 | default: |
8eca0b47 NP |
1719 | data = NULL; |
1720 | error("unknown object type %i at offset %"PRIuMAX" in %s", | |
1721 | *type, (uintmax_t)obj_offset, p->pack_name); | |
1f688557 | 1722 | } |
03e79c88 | 1723 | unuse_pack(&w_curs); |
21666f1a | 1724 | return data; |
1f688557 JH |
1725 | } |
1726 | ||
d079837e | 1727 | const unsigned char *nth_packed_object_sha1(struct packed_git *p, |
d72308e0 | 1728 | uint32_t n) |
9a217f2a | 1729 | { |
42873078 | 1730 | const unsigned char *index = p->index_data; |
d079837e SP |
1731 | if (!index) { |
1732 | if (open_pack_index(p)) | |
1733 | return NULL; | |
1734 | index = p->index_data; | |
1735 | } | |
57059091 | 1736 | if (n >= p->num_objects) |
d72308e0 | 1737 | return NULL; |
74e34e1f NP |
1738 | index += 4 * 256; |
1739 | if (p->index_version == 1) { | |
1740 | return index + 24 * n + 4; | |
1741 | } else { | |
1742 | index += 8; | |
1743 | return index + 20 * n; | |
1744 | } | |
1745 | } | |
1746 | ||
99093238 | 1747 | off_t nth_packed_object_offset(const struct packed_git *p, uint32_t n) |
74e34e1f NP |
1748 | { |
1749 | const unsigned char *index = p->index_data; | |
1750 | index += 4 * 256; | |
1751 | if (p->index_version == 1) { | |
1752 | return ntohl(*((uint32_t *)(index + 24 * n))); | |
1753 | } else { | |
1754 | uint32_t off; | |
1755 | index += 8 + p->num_objects * (20 + 4); | |
1756 | off = ntohl(*((uint32_t *)(index + 4 * n))); | |
1757 | if (!(off & 0x80000000)) | |
1758 | return off; | |
1759 | index += p->num_objects * 4 + (off & 0x7fffffff) * 8; | |
1760 | return (((uint64_t)ntohl(*((uint32_t *)(index + 0)))) << 32) | | |
1761 | ntohl(*((uint32_t *)(index + 4))); | |
1762 | } | |
9a217f2a JH |
1763 | } |
1764 | ||
c4001d92 | 1765 | off_t find_pack_entry_one(const unsigned char *sha1, |
43057304 | 1766 | struct packed_git *p) |
1f688557 | 1767 | { |
42873078 | 1768 | const uint32_t *level1_ofs = p->index_data; |
42873078 | 1769 | const unsigned char *index = p->index_data; |
628522ec JH |
1770 | unsigned hi, lo, stride; |
1771 | static int use_lookup = -1; | |
1772 | static int debug_lookup = -1; | |
1773 | ||
1774 | if (debug_lookup < 0) | |
1775 | debug_lookup = !!getenv("GIT_DEBUG_LOOKUP"); | |
42873078 | 1776 | |
d079837e SP |
1777 | if (!index) { |
1778 | if (open_pack_index(p)) | |
1779 | return 0; | |
1780 | level1_ofs = p->index_data; | |
1781 | index = p->index_data; | |
1782 | } | |
74e34e1f NP |
1783 | if (p->index_version > 1) { |
1784 | level1_ofs += 2; | |
1785 | index += 8; | |
1786 | } | |
42873078 | 1787 | index += 4 * 256; |
74e34e1f NP |
1788 | hi = ntohl(level1_ofs[*sha1]); |
1789 | lo = ((*sha1 == 0x0) ? 0 : ntohl(level1_ofs[*sha1 - 1])); | |
628522ec JH |
1790 | if (p->index_version > 1) { |
1791 | stride = 20; | |
1792 | } else { | |
1793 | stride = 24; | |
1794 | index += 4; | |
1795 | } | |
1796 | ||
1797 | if (debug_lookup) | |
6e1c2344 | 1798 | printf("%02x%02x%02x... lo %u hi %u nr %"PRIu32"\n", |
628522ec JH |
1799 | sha1[0], sha1[1], sha1[2], lo, hi, p->num_objects); |
1800 | ||
1801 | if (use_lookup < 0) | |
1802 | use_lookup = !!getenv("GIT_USE_LOOKUP"); | |
1803 | if (use_lookup) { | |
1804 | int pos = sha1_entry_pos(index, stride, 0, | |
1805 | lo, hi, p->num_objects, sha1); | |
1806 | if (pos < 0) | |
1807 | return 0; | |
1808 | return nth_packed_object_offset(p, pos); | |
1809 | } | |
1f688557 JH |
1810 | |
1811 | do { | |
74e34e1f | 1812 | unsigned mi = (lo + hi) / 2; |
628522ec JH |
1813 | int cmp = hashcmp(index + mi * stride, sha1); |
1814 | ||
1815 | if (debug_lookup) | |
1816 | printf("lo %u hi %u rg %u mi %u\n", | |
1817 | lo, hi, hi - lo, mi); | |
43057304 | 1818 | if (!cmp) |
74e34e1f | 1819 | return nth_packed_object_offset(p, mi); |
1f688557 JH |
1820 | if (cmp > 0) |
1821 | hi = mi; | |
1822 | else | |
1823 | lo = mi+1; | |
1824 | } while (lo < hi); | |
1825 | return 0; | |
1826 | } | |
1827 | ||
000dfd3f | 1828 | int matches_pack_name(struct packed_git *p, const char *name) |
d4ff6d92 SP |
1829 | { |
1830 | const char *last_c, *c; | |
1831 | ||
000dfd3f JH |
1832 | if (!strcmp(p->pack_name, name)) |
1833 | return 1; | |
d4ff6d92 SP |
1834 | |
1835 | for (c = p->pack_name, last_c = c; *c;) | |
1836 | if (*c == '/') | |
1837 | last_c = ++c; | |
1838 | else | |
1839 | ++c; | |
000dfd3f JH |
1840 | if (!strcmp(last_c, name)) |
1841 | return 1; | |
d4ff6d92 | 1842 | |
000dfd3f | 1843 | return 0; |
d4ff6d92 SP |
1844 | } |
1845 | ||
106d710b | 1846 | static int find_pack_entry(const unsigned char *sha1, struct pack_entry *e, const char **ignore_packed) |
1f688557 | 1847 | { |
f7c22cc6 | 1848 | static struct packed_git *last_found = (void *)1; |
1f688557 | 1849 | struct packed_git *p; |
c4001d92 | 1850 | off_t offset; |
43057304 | 1851 | |
1f688557 | 1852 | prepare_packed_git(); |
f7c22cc6 NP |
1853 | if (!packed_git) |
1854 | return 0; | |
1855 | p = (last_found == (void *)1) ? packed_git : last_found; | |
1f688557 | 1856 | |
f7c22cc6 | 1857 | do { |
106d710b JH |
1858 | if (ignore_packed) { |
1859 | const char **ig; | |
1860 | for (ig = ignore_packed; *ig; ig++) | |
000dfd3f | 1861 | if (matches_pack_name(p, *ig)) |
106d710b JH |
1862 | break; |
1863 | if (*ig) | |
f7c22cc6 | 1864 | goto next; |
106d710b | 1865 | } |
f7c22cc6 | 1866 | |
8eca0b47 NP |
1867 | if (p->num_bad_objects) { |
1868 | unsigned i; | |
1869 | for (i = 0; i < p->num_bad_objects; i++) | |
1870 | if (!hashcmp(sha1, p->bad_object_sha1 + 20 * i)) | |
1871 | goto next; | |
1872 | } | |
1873 | ||
43057304 NP |
1874 | offset = find_pack_entry_one(sha1, p); |
1875 | if (offset) { | |
c715f783 SP |
1876 | /* |
1877 | * We are about to tell the caller where they can | |
1878 | * locate the requested object. We better make | |
1879 | * sure the packfile is still here and can be | |
1880 | * accessed before supplying that answer, as | |
1881 | * it may have been deleted since the index | |
1882 | * was loaded! | |
1883 | */ | |
1884 | if (p->pack_fd == -1 && open_packed_git(p)) { | |
1885 | error("packfile %s cannot be accessed", p->pack_name); | |
f7c22cc6 | 1886 | goto next; |
c715f783 | 1887 | } |
43057304 NP |
1888 | e->offset = offset; |
1889 | e->p = p; | |
1890 | hashcpy(e->sha1, sha1); | |
f7c22cc6 | 1891 | last_found = p; |
1f688557 | 1892 | return 1; |
43057304 | 1893 | } |
f7c22cc6 NP |
1894 | |
1895 | next: | |
1896 | if (p == last_found) | |
1897 | p = packed_git; | |
1898 | else | |
1899 | p = p->next; | |
1900 | if (p == last_found) | |
1901 | p = p->next; | |
1902 | } while (p); | |
1f688557 JH |
1903 | return 0; |
1904 | } | |
1905 | ||
a6080a0a | 1906 | struct packed_git *find_sha1_pack(const unsigned char *sha1, |
bf592c50 DB |
1907 | struct packed_git *packs) |
1908 | { | |
1909 | struct packed_git *p; | |
bf592c50 DB |
1910 | |
1911 | for (p = packs; p; p = p->next) { | |
43057304 | 1912 | if (find_pack_entry_one(sha1, p)) |
bf592c50 DB |
1913 | return p; |
1914 | } | |
1915 | return NULL; | |
21666f1a | 1916 | |
bf592c50 DB |
1917 | } |
1918 | ||
21666f1a | 1919 | static int sha1_loose_object_info(const unsigned char *sha1, unsigned long *sizep) |
65c2e0c3 | 1920 | { |
36e4d74a | 1921 | int status; |
65c2e0c3 JH |
1922 | unsigned long mapsize, size; |
1923 | void *map; | |
1924 | z_stream stream; | |
d65a16f6 | 1925 | char hdr[32]; |
65c2e0c3 | 1926 | |
bb6b8e4f | 1927 | map = map_sha1_file(sha1, &mapsize); |
f0df4ed5 JS |
1928 | if (!map) |
1929 | return error("unable to find %s", sha1_to_hex(sha1)); | |
36e4d74a JH |
1930 | if (unpack_sha1_header(&stream, map, mapsize, hdr, sizeof(hdr)) < 0) |
1931 | status = error("unable to unpack %s header", | |
1932 | sha1_to_hex(sha1)); | |
21666f1a | 1933 | else if ((status = parse_sha1_header(hdr, &size)) < 0) |
36e4d74a | 1934 | status = error("unable to parse %s header", sha1_to_hex(sha1)); |
21666f1a NP |
1935 | else if (sizep) |
1936 | *sizep = size; | |
65c2e0c3 JH |
1937 | inflateEnd(&stream); |
1938 | munmap(map, mapsize); | |
1939 | return status; | |
1940 | } | |
1941 | ||
21666f1a | 1942 | int sha1_object_info(const unsigned char *sha1, unsigned long *sizep) |
f0df4ed5 | 1943 | { |
f0df4ed5 | 1944 | struct pack_entry e; |
ddd63e64 | 1945 | int status; |
f0df4ed5 JS |
1946 | |
1947 | if (!find_pack_entry(sha1, &e, NULL)) { | |
ddd63e64 SG |
1948 | /* Most likely it's a loose object. */ |
1949 | status = sha1_loose_object_info(sha1, sizep); | |
1950 | if (status >= 0) | |
1951 | return status; | |
1952 | ||
1953 | /* Not a loose object; someone else may have just packed it. */ | |
f0df4ed5 JS |
1954 | reprepare_packed_git(); |
1955 | if (!find_pack_entry(sha1, &e, NULL)) | |
ddd63e64 | 1956 | return status; |
f0df4ed5 | 1957 | } |
21666f1a | 1958 | return packed_object_info(e.p, e.offset, sizep); |
f0df4ed5 JS |
1959 | } |
1960 | ||
21666f1a NP |
1961 | static void *read_packed_sha1(const unsigned char *sha1, |
1962 | enum object_type *type, unsigned long *size) | |
1f688557 JH |
1963 | { |
1964 | struct pack_entry e; | |
8eca0b47 | 1965 | void *data; |
1f688557 | 1966 | |
8276c007 | 1967 | if (!find_pack_entry(sha1, &e, NULL)) |
1f688557 | 1968 | return NULL; |
8eca0b47 NP |
1969 | data = cache_or_unpack_entry(e.p, e.offset, size, type, 1); |
1970 | if (!data) { | |
1971 | /* | |
1972 | * We're probably in deep shit, but let's try to fetch | |
1973 | * the required object anyway from another pack or loose. | |
1974 | * This should happen only in the presence of a corrupted | |
1975 | * pack, and is better than failing outright. | |
1976 | */ | |
1977 | error("failed to read object %s at offset %"PRIuMAX" from %s", | |
1978 | sha1_to_hex(sha1), (uintmax_t)e.offset, e.p->pack_name); | |
1979 | mark_bad_packed_object(e.p, sha1); | |
ac939109 | 1980 | data = read_object(sha1, type, size); |
8eca0b47 NP |
1981 | } |
1982 | return data; | |
1f688557 JH |
1983 | } |
1984 | ||
d66b37bb JH |
1985 | /* |
1986 | * This is meant to hold a *small* number of objects that you would | |
1987 | * want read_sha1_file() to be able to return, but yet you do not want | |
1988 | * to write them into the object store (e.g. a browse-only | |
1989 | * application). | |
1990 | */ | |
1991 | static struct cached_object { | |
1992 | unsigned char sha1[20]; | |
21666f1a | 1993 | enum object_type type; |
d66b37bb JH |
1994 | void *buf; |
1995 | unsigned long size; | |
1996 | } *cached_objects; | |
1997 | static int cached_object_nr, cached_object_alloc; | |
1998 | ||
346245a1 JK |
1999 | static struct cached_object empty_tree = { |
2000 | /* empty tree sha1: 4b825dc642cb6eb9a060e54bf8d69288fbee4904 */ | |
2001 | "\x4b\x82\x5d\xc6\x42\xcb\x6e\xb9\xa0\x60" | |
2002 | "\xe5\x4b\xf8\xd6\x92\x88\xfb\xee\x49\x04", | |
2003 | OBJ_TREE, | |
2004 | "", | |
2005 | 0 | |
2006 | }; | |
2007 | ||
d66b37bb JH |
2008 | static struct cached_object *find_cached_object(const unsigned char *sha1) |
2009 | { | |
2010 | int i; | |
2011 | struct cached_object *co = cached_objects; | |
2012 | ||
2013 | for (i = 0; i < cached_object_nr; i++, co++) { | |
2014 | if (!hashcmp(co->sha1, sha1)) | |
2015 | return co; | |
2016 | } | |
346245a1 JK |
2017 | if (!hashcmp(sha1, empty_tree.sha1)) |
2018 | return &empty_tree; | |
d66b37bb JH |
2019 | return NULL; |
2020 | } | |
2021 | ||
21666f1a NP |
2022 | int pretend_sha1_file(void *buf, unsigned long len, enum object_type type, |
2023 | unsigned char *sha1) | |
d66b37bb JH |
2024 | { |
2025 | struct cached_object *co; | |
2026 | ||
21666f1a | 2027 | hash_sha1_file(buf, len, typename(type), sha1); |
d66b37bb JH |
2028 | if (has_sha1_file(sha1) || find_cached_object(sha1)) |
2029 | return 0; | |
2030 | if (cached_object_alloc <= cached_object_nr) { | |
2031 | cached_object_alloc = alloc_nr(cached_object_alloc); | |
2032 | cached_objects = xrealloc(cached_objects, | |
2033 | sizeof(*cached_objects) * | |
2034 | cached_object_alloc); | |
2035 | } | |
2036 | co = &cached_objects[cached_object_nr++]; | |
2037 | co->size = len; | |
21666f1a | 2038 | co->type = type; |
efa13f7b JH |
2039 | co->buf = xmalloc(len); |
2040 | memcpy(co->buf, buf, len); | |
d66b37bb JH |
2041 | hashcpy(co->sha1, sha1); |
2042 | return 0; | |
2043 | } | |
2044 | ||
ac939109 NP |
2045 | void *read_object(const unsigned char *sha1, enum object_type *type, |
2046 | unsigned long *size) | |
0fcfd160 LT |
2047 | { |
2048 | unsigned long mapsize; | |
2049 | void *map, *buf; | |
d66b37bb JH |
2050 | struct cached_object *co; |
2051 | ||
2052 | co = find_cached_object(sha1); | |
2053 | if (co) { | |
21666f1a | 2054 | *type = co->type; |
d66b37bb | 2055 | *size = co->size; |
182af834 | 2056 | return xmemdupz(co->buf, co->size); |
d66b37bb | 2057 | } |
0fcfd160 | 2058 | |
8276c007 PE |
2059 | buf = read_packed_sha1(sha1, type, size); |
2060 | if (buf) | |
2061 | return buf; | |
bb6b8e4f | 2062 | map = map_sha1_file(sha1, &mapsize); |
0fcfd160 | 2063 | if (map) { |
7efbff75 | 2064 | buf = unpack_sha1_file(map, mapsize, type, size, sha1); |
0fcfd160 LT |
2065 | munmap(map, mapsize); |
2066 | return buf; | |
2067 | } | |
637cdd9d | 2068 | reprepare_packed_git(); |
8276c007 | 2069 | return read_packed_sha1(sha1, type, size); |
0fcfd160 LT |
2070 | } |
2071 | ||
ac939109 NP |
2072 | void *read_sha1_file(const unsigned char *sha1, enum object_type *type, |
2073 | unsigned long *size) | |
2074 | { | |
2075 | void *data = read_object(sha1, type, size); | |
2076 | /* legacy behavior is to die on corrupted objects */ | |
2077 | if (!data && (has_loose_object(sha1) || has_packed_and_bad(sha1))) | |
2078 | die("object %s is corrupted", sha1_to_hex(sha1)); | |
2079 | return data; | |
2080 | } | |
2081 | ||
40469ee9 | 2082 | void *read_object_with_reference(const unsigned char *sha1, |
21666f1a | 2083 | const char *required_type_name, |
40469ee9 JH |
2084 | unsigned long *size, |
2085 | unsigned char *actual_sha1_return) | |
f4913f91 | 2086 | { |
21666f1a | 2087 | enum object_type type, required_type; |
f4913f91 JH |
2088 | void *buffer; |
2089 | unsigned long isize; | |
40469ee9 | 2090 | unsigned char actual_sha1[20]; |
f4913f91 | 2091 | |
21666f1a | 2092 | required_type = type_from_string(required_type_name); |
e702496e | 2093 | hashcpy(actual_sha1, sha1); |
40469ee9 JH |
2094 | while (1) { |
2095 | int ref_length = -1; | |
2096 | const char *ref_type = NULL; | |
f4913f91 | 2097 | |
21666f1a | 2098 | buffer = read_sha1_file(actual_sha1, &type, &isize); |
40469ee9 JH |
2099 | if (!buffer) |
2100 | return NULL; | |
21666f1a | 2101 | if (type == required_type) { |
40469ee9 JH |
2102 | *size = isize; |
2103 | if (actual_sha1_return) | |
e702496e | 2104 | hashcpy(actual_sha1_return, actual_sha1); |
40469ee9 JH |
2105 | return buffer; |
2106 | } | |
2107 | /* Handle references */ | |
21666f1a | 2108 | else if (type == OBJ_COMMIT) |
40469ee9 | 2109 | ref_type = "tree "; |
21666f1a | 2110 | else if (type == OBJ_TAG) |
40469ee9 JH |
2111 | ref_type = "object "; |
2112 | else { | |
2113 | free(buffer); | |
2114 | return NULL; | |
2115 | } | |
2116 | ref_length = strlen(ref_type); | |
f4913f91 | 2117 | |
50974ec9 MK |
2118 | if (ref_length + 40 > isize || |
2119 | memcmp(buffer, ref_type, ref_length) || | |
1d7f171c | 2120 | get_sha1_hex((char *) buffer + ref_length, actual_sha1)) { |
40469ee9 JH |
2121 | free(buffer); |
2122 | return NULL; | |
2123 | } | |
1cf58e72 | 2124 | free(buffer); |
40469ee9 JH |
2125 | /* Now we have the ID of the referred-to object in |
2126 | * actual_sha1. Check again. */ | |
f4913f91 | 2127 | } |
f4913f91 JH |
2128 | } |
2129 | ||
ce9fbf16 | 2130 | static void write_sha1_file_prepare(const void *buf, unsigned long len, |
972a9155 | 2131 | const char *type, unsigned char *sha1, |
d65a16f6 | 2132 | char *hdr, int *hdrlen) |
d410c0f5 JH |
2133 | { |
2134 | SHA_CTX c; | |
2135 | ||
2136 | /* Generate the header */ | |
d65a16f6 | 2137 | *hdrlen = sprintf(hdr, "%s %lu", type, len)+1; |
d410c0f5 JH |
2138 | |
2139 | /* Sha1.. */ | |
2140 | SHA1_Init(&c); | |
2141 | SHA1_Update(&c, hdr, *hdrlen); | |
2142 | SHA1_Update(&c, buf, len); | |
2143 | SHA1_Final(sha1, &c); | |
d410c0f5 JH |
2144 | } |
2145 | ||
230f1322 LT |
2146 | /* |
2147 | * Move the just written object into its final resting place | |
2148 | */ | |
839837b9 | 2149 | int move_temp_to_file(const char *tmpfile, const char *filename) |
230f1322 | 2150 | { |
e32c0a9c TR |
2151 | int ret = 0; |
2152 | if (link(tmpfile, filename)) | |
2153 | ret = errno; | |
7ebb6fca LT |
2154 | |
2155 | /* | |
2156 | * Coda hack - coda doesn't like cross-directory links, | |
2157 | * so we fall back to a rename, which will mean that it | |
2158 | * won't be able to check collisions, but that's not a | |
2159 | * big deal. | |
2160 | * | |
2161 | * The same holds for FAT formatted media. | |
2162 | * | |
2163 | * When this succeeds, we just return 0. We have nothing | |
2164 | * left to unlink. | |
2165 | */ | |
2166 | if (ret && ret != EEXIST) { | |
2167 | if (!rename(tmpfile, filename)) | |
230f1322 | 2168 | return 0; |
9e48b389 | 2169 | ret = errno; |
230f1322 LT |
2170 | } |
2171 | unlink(tmpfile); | |
2172 | if (ret) { | |
2173 | if (ret != EEXIST) { | |
916d081b | 2174 | return error("unable to write sha1 filename %s: %s\n", filename, strerror(ret)); |
230f1322 LT |
2175 | } |
2176 | /* FIXME!!! Collision check here ? */ | |
2177 | } | |
2178 | ||
2179 | return 0; | |
2180 | } | |
2181 | ||
4d548150 LT |
2182 | static int write_buffer(int fd, const void *buf, size_t len) |
2183 | { | |
d34cf19b | 2184 | if (write_in_full(fd, buf, len) < 0) |
93822c22 | 2185 | return error("file write error (%s)", strerror(errno)); |
4d548150 LT |
2186 | return 0; |
2187 | } | |
2188 | ||
ce9fbf16 | 2189 | int hash_sha1_file(const void *buf, unsigned long len, const char *type, |
abdc3fc8 RS |
2190 | unsigned char *sha1) |
2191 | { | |
d65a16f6 | 2192 | char hdr[32]; |
abdc3fc8 RS |
2193 | int hdrlen; |
2194 | write_sha1_file_prepare(buf, len, type, sha1, hdr, &hdrlen); | |
2195 | return 0; | |
2196 | } | |
2197 | ||
e9039dd3 LT |
2198 | /* Finalize a file on disk, and close it. */ |
2199 | static void close_sha1_file(int fd) | |
2200 | { | |
aafe9fba LT |
2201 | if (fsync_object_files) |
2202 | fsync_or_die(fd, "sha1 file"); | |
e9039dd3 LT |
2203 | fchmod(fd, 0444); |
2204 | if (close(fd) != 0) | |
2205 | die("unable to write sha1 file"); | |
2206 | } | |
2207 | ||
5723fe7e LT |
2208 | /* Size of directory component, including the ending '/' */ |
2209 | static inline int directory_size(const char *filename) | |
2210 | { | |
2211 | const char *s = strrchr(filename, '/'); | |
2212 | if (!s) | |
2213 | return 0; | |
2214 | return s - filename + 1; | |
2215 | } | |
2216 | ||
2217 | /* | |
2218 | * This creates a temporary file in the same directory as the final | |
2219 | * 'filename' | |
2220 | * | |
2221 | * We want to avoid cross-directory filename renames, because those | |
2222 | * can have problems on various filesystems (FAT, NFS, Coda). | |
2223 | */ | |
2224 | static int create_tmpfile(char *buffer, size_t bufsiz, const char *filename) | |
2225 | { | |
2226 | int fd, dirlen = directory_size(filename); | |
2227 | ||
2228 | if (dirlen + 20 > bufsiz) { | |
2229 | errno = ENAMETOOLONG; | |
2230 | return -1; | |
2231 | } | |
2232 | memcpy(buffer, filename, dirlen); | |
2233 | strcpy(buffer + dirlen, "tmp_obj_XXXXXX"); | |
2234 | fd = mkstemp(buffer); | |
65117abc | 2235 | if (fd < 0 && dirlen && errno == ENOENT) { |
5723fe7e | 2236 | /* Make sure the directory exists */ |
6ff6af62 | 2237 | memcpy(buffer, filename, dirlen); |
5723fe7e | 2238 | buffer[dirlen-1] = 0; |
3bfaf018 | 2239 | if (mkdir(buffer, 0777) || adjust_shared_perm(buffer)) |
5723fe7e LT |
2240 | return -1; |
2241 | ||
2242 | /* Try again */ | |
2243 | strcpy(buffer + dirlen - 1, "/tmp_obj_XXXXXX"); | |
2244 | fd = mkstemp(buffer); | |
2245 | } | |
2246 | return fd; | |
2247 | } | |
2248 | ||
bbac7311 NP |
2249 | static int write_loose_object(const unsigned char *sha1, char *hdr, int hdrlen, |
2250 | void *buf, unsigned long len, time_t mtime) | |
0fcfd160 | 2251 | { |
bbac7311 | 2252 | int fd, size, ret; |
bf0f910d | 2253 | unsigned char *compressed; |
0fcfd160 | 2254 | z_stream stream; |
706bc531 | 2255 | char *filename; |
aac17941 | 2256 | static char tmpfile[PATH_MAX]; |
a44c9a5e | 2257 | |
972a9155 | 2258 | filename = sha1_file_name(sha1); |
5723fe7e | 2259 | fd = create_tmpfile(tmpfile, sizeof(tmpfile), filename); |
aac17941 | 2260 | if (fd < 0) { |
35243577 | 2261 | if (errno == EACCES) |
916d081b PB |
2262 | return error("insufficient permission for adding an object to repository database %s\n", get_object_directory()); |
2263 | else | |
2264 | return error("unable to create temporary sha1 filename %s: %s\n", tmpfile, strerror(errno)); | |
aac17941 LT |
2265 | } |
2266 | ||
0fcfd160 LT |
2267 | /* Set it up */ |
2268 | memset(&stream, 0, sizeof(stream)); | |
12f6c308 | 2269 | deflateInit(&stream, zlib_compression_level); |
93821bd9 | 2270 | size = 8 + deflateBound(&stream, len+hdrlen); |
812666c8 | 2271 | compressed = xmalloc(size); |
0fcfd160 LT |
2272 | |
2273 | /* Compress it */ | |
0fcfd160 LT |
2274 | stream.next_out = compressed; |
2275 | stream.avail_out = size; | |
a44c9a5e LT |
2276 | |
2277 | /* First header.. */ | |
d65a16f6 | 2278 | stream.next_in = (unsigned char *)hdr; |
a44c9a5e | 2279 | stream.avail_in = hdrlen; |
726f852b NP |
2280 | while (deflate(&stream, 0) == Z_OK) |
2281 | /* nothing */; | |
a44c9a5e LT |
2282 | |
2283 | /* Then the data itself.. */ | |
2284 | stream.next_in = buf; | |
2285 | stream.avail_in = len; | |
ac54c277 LT |
2286 | ret = deflate(&stream, Z_FINISH); |
2287 | if (ret != Z_STREAM_END) | |
2288 | die("unable to deflate new object %s (%d)", sha1_to_hex(sha1), ret); | |
2289 | ||
2290 | ret = deflateEnd(&stream); | |
2291 | if (ret != Z_OK) | |
2292 | die("deflateEnd on object %s failed (%d)", sha1_to_hex(sha1), ret); | |
2293 | ||
0fcfd160 LT |
2294 | size = stream.total_out; |
2295 | ||
4d548150 LT |
2296 | if (write_buffer(fd, compressed, size) < 0) |
2297 | die("unable to write sha1 file"); | |
e9039dd3 | 2298 | close_sha1_file(fd); |
383f85b7 | 2299 | free(compressed); |
0fcfd160 | 2300 | |
bbac7311 NP |
2301 | if (mtime) { |
2302 | struct utimbuf utb; | |
2303 | utb.actime = mtime; | |
2304 | utb.modtime = mtime; | |
2305 | if (utime(tmpfile, &utb) < 0) | |
2306 | warning("failed utime() on %s: %s", | |
2307 | tmpfile, strerror(errno)); | |
2308 | } | |
2309 | ||
230f1322 | 2310 | return move_temp_to_file(tmpfile, filename); |
0fcfd160 | 2311 | } |
8237b185 | 2312 | |
bbac7311 NP |
2313 | int write_sha1_file(void *buf, unsigned long len, const char *type, unsigned char *returnsha1) |
2314 | { | |
2315 | unsigned char sha1[20]; | |
2316 | char hdr[32]; | |
2317 | int hdrlen; | |
2318 | ||
2319 | /* Normally if we have it in the pack then we do not bother writing | |
2320 | * it out into .git/objects/??/?{38} file. | |
2321 | */ | |
2322 | write_sha1_file_prepare(buf, len, type, sha1, hdr, &hdrlen); | |
2323 | if (returnsha1) | |
2324 | hashcpy(returnsha1, sha1); | |
2325 | if (has_sha1_file(sha1)) | |
2326 | return 0; | |
2327 | return write_loose_object(sha1, hdr, hdrlen, buf, len, 0); | |
2328 | } | |
2329 | ||
2330 | int force_object_loose(const unsigned char *sha1, time_t mtime) | |
2331 | { | |
bbac7311 NP |
2332 | void *buf; |
2333 | unsigned long len; | |
2334 | enum object_type type; | |
2335 | char hdr[32]; | |
2336 | int hdrlen; | |
1fb23e65 | 2337 | int ret; |
bbac7311 | 2338 | |
c529d75a | 2339 | if (has_loose_object(sha1)) |
bbac7311 NP |
2340 | return 0; |
2341 | buf = read_packed_sha1(sha1, &type, &len); | |
2342 | if (!buf) | |
2343 | return error("cannot read sha1_file for %s", sha1_to_hex(sha1)); | |
2344 | hdrlen = sprintf(hdr, "%s %lu", typename(type), len) + 1; | |
1fb23e65 BS |
2345 | ret = write_loose_object(sha1, hdr, hdrlen, buf, len, mtime); |
2346 | free(buf); | |
2347 | ||
2348 | return ret; | |
bbac7311 NP |
2349 | } |
2350 | ||
bf592c50 DB |
2351 | int has_pack_index(const unsigned char *sha1) |
2352 | { | |
2353 | struct stat st; | |
2354 | if (stat(sha1_pack_index_name(sha1), &st)) | |
2355 | return 0; | |
2356 | return 1; | |
2357 | } | |
2358 | ||
2359 | int has_pack_file(const unsigned char *sha1) | |
2360 | { | |
2361 | struct stat st; | |
2362 | if (stat(sha1_pack_name(sha1), &st)) | |
2363 | return 0; | |
2364 | return 1; | |
2365 | } | |
2366 | ||
106d710b | 2367 | int has_sha1_pack(const unsigned char *sha1, const char **ignore_packed) |
dade09c2 LT |
2368 | { |
2369 | struct pack_entry e; | |
106d710b | 2370 | return find_pack_entry(sha1, &e, ignore_packed); |
dade09c2 LT |
2371 | } |
2372 | ||
8237b185 DB |
2373 | int has_sha1_file(const unsigned char *sha1) |
2374 | { | |
1f688557 JH |
2375 | struct pack_entry e; |
2376 | ||
106d710b | 2377 | if (find_pack_entry(sha1, &e, NULL)) |
1f688557 | 2378 | return 1; |
c529d75a | 2379 | return has_loose_object(sha1); |
8237b185 | 2380 | } |
74400e71 | 2381 | |
e7332f96 BE |
2382 | int index_pipe(unsigned char *sha1, int fd, const char *type, int write_object) |
2383 | { | |
fd17f5b5 | 2384 | struct strbuf buf; |
e7332f96 | 2385 | int ret; |
e7332f96 | 2386 | |
fd17f5b5 PH |
2387 | strbuf_init(&buf, 0); |
2388 | if (strbuf_read(&buf, fd, 4096) < 0) { | |
2389 | strbuf_release(&buf); | |
024510c8 DB |
2390 | return -1; |
2391 | } | |
e7332f96 | 2392 | |
024510c8 | 2393 | if (!type) |
8e440259 | 2394 | type = blob_type; |
024510c8 | 2395 | if (write_object) |
fd17f5b5 | 2396 | ret = write_sha1_file(buf.buf, buf.len, type, sha1); |
abdc3fc8 | 2397 | else |
fd17f5b5 PH |
2398 | ret = hash_sha1_file(buf.buf, buf.len, type, sha1); |
2399 | strbuf_release(&buf); | |
2400 | ||
024510c8 DB |
2401 | return ret; |
2402 | } | |
2403 | ||
edaec3fb | 2404 | int index_fd(unsigned char *sha1, int fd, struct stat *st, int write_object, |
53bca91a | 2405 | enum object_type type, const char *path) |
74400e71 | 2406 | { |
dc49cd76 | 2407 | size_t size = xsize_t(st->st_size); |
3a55602e | 2408 | void *buf = NULL; |
6c510bee | 2409 | int ret, re_allocated = 0; |
74400e71 | 2410 | |
74400e71 | 2411 | if (size) |
c4712e45 | 2412 | buf = xmmap(NULL, size, PROT_READ, MAP_PRIVATE, fd, 0); |
74400e71 | 2413 | close(fd); |
74400e71 | 2414 | |
7672db20 | 2415 | if (!type) |
edaec3fb | 2416 | type = OBJ_BLOB; |
6c510bee LT |
2417 | |
2418 | /* | |
2419 | * Convert blobs to git internal format | |
2420 | */ | |
d0d8e14d | 2421 | if ((type == OBJ_BLOB) && S_ISREG(st->st_mode)) { |
5ecd293d PH |
2422 | struct strbuf nbuf; |
2423 | strbuf_init(&nbuf, 0); | |
21e5ad50 SP |
2424 | if (convert_to_git(path, buf, size, &nbuf, |
2425 | write_object ? safe_crlf : 0)) { | |
ac78e548 | 2426 | munmap(buf, size); |
b315c5c0 | 2427 | buf = strbuf_detach(&nbuf, &size); |
6c510bee LT |
2428 | re_allocated = 1; |
2429 | } | |
2430 | } | |
2431 | ||
7672db20 | 2432 | if (write_object) |
edaec3fb | 2433 | ret = write_sha1_file(buf, size, typename(type), sha1); |
abdc3fc8 | 2434 | else |
edaec3fb | 2435 | ret = hash_sha1_file(buf, size, typename(type), sha1); |
6c510bee LT |
2436 | if (re_allocated) { |
2437 | free(buf); | |
2438 | return ret; | |
2439 | } | |
aac17941 LT |
2440 | if (size) |
2441 | munmap(buf, size); | |
2442 | return ret; | |
74400e71 | 2443 | } |
ec1fcc16 JH |
2444 | |
2445 | int index_path(unsigned char *sha1, const char *path, struct stat *st, int write_object) | |
2446 | { | |
2447 | int fd; | |
2448 | char *target; | |
dc49cd76 | 2449 | size_t len; |
ec1fcc16 JH |
2450 | |
2451 | switch (st->st_mode & S_IFMT) { | |
2452 | case S_IFREG: | |
2453 | fd = open(path, O_RDONLY); | |
2454 | if (fd < 0) | |
2455 | return error("open(\"%s\"): %s", path, | |
2456 | strerror(errno)); | |
53bca91a | 2457 | if (index_fd(sha1, fd, st, write_object, OBJ_BLOB, path) < 0) |
ec1fcc16 JH |
2458 | return error("%s: failed to insert into database", |
2459 | path); | |
2460 | break; | |
2461 | case S_IFLNK: | |
dc49cd76 SP |
2462 | len = xsize_t(st->st_size); |
2463 | target = xmalloc(len + 1); | |
2464 | if (readlink(path, target, len + 1) != st->st_size) { | |
ec1fcc16 JH |
2465 | char *errstr = strerror(errno); |
2466 | free(target); | |
2467 | return error("readlink(\"%s\"): %s", path, | |
2468 | errstr); | |
2469 | } | |
abdc3fc8 | 2470 | if (!write_object) |
dc49cd76 SP |
2471 | hash_sha1_file(target, len, blob_type, sha1); |
2472 | else if (write_sha1_file(target, len, blob_type, sha1)) | |
ec1fcc16 JH |
2473 | return error("%s: failed to insert into database", |
2474 | path); | |
2475 | free(target); | |
2476 | break; | |
f35a6d3b LT |
2477 | case S_IFDIR: |
2478 | return resolve_gitlink_ref(path, "HEAD", sha1); | |
ec1fcc16 JH |
2479 | default: |
2480 | return error("%s: unsupported file type", path); | |
2481 | } | |
2482 | return 0; | |
2483 | } | |
a69e5429 JH |
2484 | |
2485 | int read_pack_header(int fd, struct pack_header *header) | |
2486 | { | |
c697ad14 HO |
2487 | if (read_in_full(fd, header, sizeof(*header)) < sizeof(*header)) |
2488 | /* "eof before pack header was fully read" */ | |
2489 | return PH_ERROR_EOF; | |
2490 | ||
a69e5429 JH |
2491 | if (header->hdr_signature != htonl(PACK_SIGNATURE)) |
2492 | /* "protocol error (pack signature mismatch detected)" */ | |
2493 | return PH_ERROR_PACK_SIGNATURE; | |
2494 | if (!pack_version_ok(header->hdr_version)) | |
2495 | /* "protocol error (pack version unsupported)" */ | |
2496 | return PH_ERROR_PROTOCOL; | |
2497 | return 0; | |
2498 | } |