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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 | ||
c74faea1 NP |
662 | /* |
663 | * This is used by git-repack in case a newly created pack happens to | |
664 | * contain the same set of objects as an existing one. In that case | |
665 | * the resulting file might be different even if its name would be the | |
666 | * same. It is best to close any reference to the old pack before it is | |
667 | * replaced on disk. Of course no index pointers nor windows for given pack | |
668 | * must subsist at this point. If ever objects from this pack are requested | |
669 | * again, the new version of the pack will be reinitialized through | |
670 | * reprepare_packed_git(). | |
671 | */ | |
672 | void free_pack_by_name(const char *pack_name) | |
673 | { | |
674 | struct packed_git *p, **pp = &packed_git; | |
675 | ||
676 | while (*pp) { | |
677 | p = *pp; | |
678 | if (strcmp(pack_name, p->pack_name) == 0) { | |
fa3a0c94 | 679 | clear_delta_base_cache(); |
c74faea1 NP |
680 | close_pack_windows(p); |
681 | if (p->pack_fd != -1) | |
682 | close(p->pack_fd); | |
683 | if (p->index_data) | |
684 | munmap((void *)p->index_data, p->index_size); | |
685 | free(p->bad_object_sha1); | |
686 | *pp = p->next; | |
687 | free(p); | |
688 | return; | |
689 | } | |
690 | pp = &p->next; | |
691 | } | |
692 | } | |
693 | ||
3cf8b462 SP |
694 | /* |
695 | * Do not call this directly as this leaks p->pack_fd on error return; | |
696 | * call open_packed_git() instead. | |
697 | */ | |
698 | static int open_packed_git_1(struct packed_git *p) | |
1f688557 | 699 | { |
9bc879c1 SP |
700 | struct stat st; |
701 | struct pack_header hdr; | |
702 | unsigned char sha1[20]; | |
703 | unsigned char *idx_sha1; | |
2c039da8 | 704 | long fd_flag; |
9bc879c1 | 705 | |
d079837e SP |
706 | if (!p->index_data && open_pack_index(p)) |
707 | return error("packfile %s index unavailable", p->pack_name); | |
708 | ||
9bc879c1 SP |
709 | p->pack_fd = open(p->pack_name, O_RDONLY); |
710 | if (p->pack_fd < 0 || fstat(p->pack_fd, &st)) | |
072db278 | 711 | return -1; |
9bc879c1 SP |
712 | |
713 | /* If we created the struct before we had the pack we lack size. */ | |
bf592c50 | 714 | if (!p->pack_size) { |
bf592c50 | 715 | if (!S_ISREG(st.st_mode)) |
072db278 | 716 | return error("packfile %s not a regular file", p->pack_name); |
bf592c50 | 717 | p->pack_size = st.st_size; |
9bc879c1 | 718 | } else if (p->pack_size != st.st_size) |
072db278 | 719 | return error("packfile %s size changed", p->pack_name); |
9bc879c1 | 720 | |
2c039da8 JH |
721 | /* We leave these file descriptors open with sliding mmap; |
722 | * there is no point keeping them open across exec(), though. | |
723 | */ | |
724 | fd_flag = fcntl(p->pack_fd, F_GETFD, 0); | |
725 | if (fd_flag < 0) | |
072db278 | 726 | return error("cannot determine file descriptor flags"); |
2c039da8 JH |
727 | fd_flag |= FD_CLOEXEC; |
728 | if (fcntl(p->pack_fd, F_SETFD, fd_flag) == -1) | |
072db278 | 729 | return error("cannot set FD_CLOEXEC"); |
2c039da8 | 730 | |
9bc879c1 | 731 | /* Verify we recognize this pack file format. */ |
e6e2bd62 | 732 | if (read_in_full(p->pack_fd, &hdr, sizeof(hdr)) != sizeof(hdr)) |
072db278 | 733 | return error("file %s is far too short to be a packfile", p->pack_name); |
9bc879c1 | 734 | if (hdr.hdr_signature != htonl(PACK_SIGNATURE)) |
072db278 | 735 | return error("file %s is not a GIT packfile", p->pack_name); |
9bc879c1 | 736 | if (!pack_version_ok(hdr.hdr_version)) |
6e1c2344 RJ |
737 | return error("packfile %s is version %"PRIu32" and not" |
738 | " supported (try upgrading GIT to a newer version)", | |
9bc879c1 SP |
739 | p->pack_name, ntohl(hdr.hdr_version)); |
740 | ||
741 | /* Verify the pack matches its index. */ | |
57059091 | 742 | if (p->num_objects != ntohl(hdr.hdr_entries)) |
6e1c2344 RJ |
743 | return error("packfile %s claims to have %"PRIu32" objects" |
744 | " while index indicates %"PRIu32" objects", | |
57059091 NP |
745 | p->pack_name, ntohl(hdr.hdr_entries), |
746 | p->num_objects); | |
9bc879c1 | 747 | if (lseek(p->pack_fd, p->pack_size - sizeof(sha1), SEEK_SET) == -1) |
072db278 | 748 | return error("end of packfile %s is unavailable", p->pack_name); |
e6e2bd62 | 749 | if (read_in_full(p->pack_fd, sha1, sizeof(sha1)) != sizeof(sha1)) |
072db278 | 750 | return error("packfile %s signature is unavailable", p->pack_name); |
42873078 | 751 | idx_sha1 = ((unsigned char *)p->index_data) + p->index_size - 40; |
9bc879c1 | 752 | if (hashcmp(sha1, idx_sha1)) |
072db278 SP |
753 | return error("packfile %s does not match index", p->pack_name); |
754 | return 0; | |
9bc879c1 SP |
755 | } |
756 | ||
3cf8b462 SP |
757 | static int open_packed_git(struct packed_git *p) |
758 | { | |
759 | if (!open_packed_git_1(p)) | |
760 | return 0; | |
761 | if (p->pack_fd != -1) { | |
762 | close(p->pack_fd); | |
763 | p->pack_fd = -1; | |
764 | } | |
765 | return -1; | |
766 | } | |
767 | ||
c4001d92 | 768 | static int in_window(struct pack_window *win, off_t offset) |
60bb8b14 SP |
769 | { |
770 | /* We must promise at least 20 bytes (one hash) after the | |
771 | * offset is available from this window, otherwise the offset | |
772 | * is not actually in this window and a different window (which | |
773 | * has that one hash excess) must be used. This is to support | |
774 | * the object header and delta base parsing routines below. | |
775 | */ | |
776 | off_t win_off = win->offset; | |
777 | return win_off <= offset | |
778 | && (offset + 20) <= (win_off + win->len); | |
779 | } | |
780 | ||
03e79c88 SP |
781 | unsigned char* use_pack(struct packed_git *p, |
782 | struct pack_window **w_cursor, | |
c4001d92 | 783 | off_t offset, |
03e79c88 | 784 | unsigned int *left) |
9bc879c1 | 785 | { |
60bb8b14 | 786 | struct pack_window *win = *w_cursor; |
03e79c88 | 787 | |
072db278 SP |
788 | if (p->pack_fd == -1 && open_packed_git(p)) |
789 | die("packfile %s cannot be accessed", p->pack_name); | |
60bb8b14 SP |
790 | |
791 | /* Since packfiles end in a hash of their content and its | |
792 | * pointless to ask for an offset into the middle of that | |
793 | * hash, and the in_window function above wouldn't match | |
794 | * don't allow an offset too close to the end of the file. | |
795 | */ | |
796 | if (offset > (p->pack_size - 20)) | |
797 | die("offset beyond end of packfile (truncated pack?)"); | |
798 | ||
799 | if (!win || !in_window(win, offset)) { | |
800 | if (win) | |
801 | win->inuse_cnt--; | |
802 | for (win = p->windows; win; win = win->next) { | |
803 | if (in_window(win, offset)) | |
804 | break; | |
805 | } | |
806 | if (!win) { | |
78a28df9 | 807 | size_t window_align = packed_git_window_size / 2; |
dc49cd76 | 808 | off_t len; |
60bb8b14 | 809 | win = xcalloc(1, sizeof(*win)); |
78a28df9 | 810 | win->offset = (offset / window_align) * window_align; |
dc49cd76 SP |
811 | len = p->pack_size - win->offset; |
812 | if (len > packed_git_window_size) | |
813 | len = packed_git_window_size; | |
814 | win->len = (size_t)len; | |
60bb8b14 | 815 | pack_mapped += win->len; |
11daf39b | 816 | while (packed_git_limit < pack_mapped |
d1efefa4 | 817 | && unuse_one_window(p, p->pack_fd)) |
60bb8b14 | 818 | ; /* nothing */ |
c4712e45 | 819 | win->base = xmmap(NULL, win->len, |
60bb8b14 SP |
820 | PROT_READ, MAP_PRIVATE, |
821 | p->pack_fd, win->offset); | |
822 | if (win->base == MAP_FAILED) | |
73b4e4be SP |
823 | die("packfile %s cannot be mapped: %s", |
824 | p->pack_name, | |
825 | strerror(errno)); | |
a53128b6 SP |
826 | pack_mmap_calls++; |
827 | pack_open_windows++; | |
828 | if (pack_mapped > peak_pack_mapped) | |
829 | peak_pack_mapped = pack_mapped; | |
830 | if (pack_open_windows > peak_pack_open_windows) | |
831 | peak_pack_open_windows = pack_open_windows; | |
60bb8b14 SP |
832 | win->next = p->windows; |
833 | p->windows = win; | |
834 | } | |
1f688557 | 835 | } |
03e79c88 SP |
836 | if (win != *w_cursor) { |
837 | win->last_used = pack_used_ctr++; | |
838 | win->inuse_cnt++; | |
839 | *w_cursor = win; | |
840 | } | |
60bb8b14 | 841 | offset -= win->offset; |
03e79c88 | 842 | if (left) |
dc49cd76 | 843 | *left = win->len - xsize_t(offset); |
03e79c88 | 844 | return win->base + offset; |
1f688557 JH |
845 | } |
846 | ||
27d69a46 NP |
847 | static struct packed_git *alloc_packed_git(int extra) |
848 | { | |
849 | struct packed_git *p = xmalloc(sizeof(*p) + extra); | |
850 | memset(p, 0, sizeof(*p)); | |
851 | p->pack_fd = -1; | |
852 | return p; | |
853 | } | |
854 | ||
42873078 | 855 | struct packed_git *add_packed_git(const char *path, int path_len, int local) |
1f688557 JH |
856 | { |
857 | struct stat st; | |
27d69a46 | 858 | struct packed_git *p = alloc_packed_git(path_len + 2); |
1f688557 | 859 | |
42873078 NP |
860 | /* |
861 | * Make sure a corresponding .pack file exists and that | |
862 | * the index looks sane. | |
863 | */ | |
864 | path_len -= strlen(".idx"); | |
27d69a46 NP |
865 | if (path_len < 1) { |
866 | free(p); | |
1f688557 | 867 | return NULL; |
27d69a46 | 868 | } |
42873078 | 869 | memcpy(p->pack_name, path, path_len); |
8d25931d BC |
870 | |
871 | strcpy(p->pack_name + path_len, ".keep"); | |
872 | if (!access(p->pack_name, F_OK)) | |
873 | p->pack_keep = 1; | |
874 | ||
42873078 | 875 | strcpy(p->pack_name + path_len, ".pack"); |
d079837e | 876 | if (stat(p->pack_name, &st) || !S_ISREG(st.st_mode)) { |
42873078 | 877 | free(p); |
1f688557 JH |
878 | return NULL; |
879 | } | |
42873078 | 880 | |
1f688557 JH |
881 | /* ok, it looks sane as far as we can check without |
882 | * actually mapping the pack file. | |
883 | */ | |
1f688557 | 884 | p->pack_size = st.st_size; |
9d835df2 | 885 | p->pack_local = local; |
b867092f | 886 | p->mtime = st.st_mtime; |
42873078 NP |
887 | if (path_len < 40 || get_sha1_hex(path + path_len - 40, p->sha1)) |
888 | hashclr(p->sha1); | |
1f688557 JH |
889 | return p; |
890 | } | |
891 | ||
bf592c50 | 892 | struct packed_git *parse_pack_index(unsigned char *sha1) |
c508df5e | 893 | { |
79c6dca4 | 894 | const char *idx_path = sha1_pack_index_name(sha1); |
42873078 | 895 | const char *path = sha1_pack_name(sha1); |
27d69a46 | 896 | struct packed_git *p = alloc_packed_git(strlen(path) + 1); |
bf592c50 | 897 | |
27d69a46 NP |
898 | strcpy(p->pack_name, path); |
899 | hashcpy(p->sha1, sha1); | |
42873078 NP |
900 | if (check_packed_git_idx(idx_path, p)) { |
901 | free(p); | |
bf592c50 | 902 | return NULL; |
42873078 | 903 | } |
bf592c50 | 904 | |
bf592c50 DB |
905 | return p; |
906 | } | |
907 | ||
908 | void install_packed_git(struct packed_git *pack) | |
909 | { | |
910 | pack->next = packed_git; | |
911 | packed_git = pack; | |
912 | } | |
913 | ||
9d835df2 | 914 | static void prepare_packed_git_one(char *objdir, int local) |
1f688557 | 915 | { |
9cb18f56 JM |
916 | /* Ensure that this buffer is large enough so that we can |
917 | append "/pack/" without clobbering the stack even if | |
918 | strlen(objdir) were PATH_MAX. */ | |
919 | char path[PATH_MAX + 1 + 4 + 1 + 1]; | |
1f688557 JH |
920 | int len; |
921 | DIR *dir; | |
922 | struct dirent *de; | |
923 | ||
924 | sprintf(path, "%s/pack", objdir); | |
925 | len = strlen(path); | |
926 | dir = opendir(path); | |
b5b16990 | 927 | if (!dir) { |
26125f6b | 928 | if (errno != ENOENT) |
bd2afde8 | 929 | error("unable to open object pack directory: %s: %s", |
26125f6b | 930 | path, strerror(errno)); |
1f688557 | 931 | return; |
b5b16990 | 932 | } |
1f688557 JH |
933 | path[len++] = '/'; |
934 | while ((de = readdir(dir)) != NULL) { | |
935 | int namelen = strlen(de->d_name); | |
936 | struct packed_git *p; | |
937 | ||
5bb1cda5 | 938 | if (!has_extension(de->d_name, ".idx")) |
1f688557 JH |
939 | continue; |
940 | ||
9cb18f56 JM |
941 | if (len + namelen + 1 > sizeof(path)) |
942 | continue; | |
943 | ||
54a15a8d | 944 | /* Don't reopen a pack we already have. */ |
1f688557 | 945 | strcpy(path + len, de->d_name); |
86f7780c JK |
946 | for (p = packed_git; p; p = p->next) { |
947 | if (!memcmp(path, p->pack_name, len + namelen - 4)) | |
948 | break; | |
949 | } | |
950 | if (p) | |
951 | continue; | |
54a15a8d SP |
952 | /* See if it really is a valid .idx file with corresponding |
953 | * .pack file that we can map. | |
954 | */ | |
9d835df2 | 955 | p = add_packed_git(path, len + namelen, local); |
1f688557 JH |
956 | if (!p) |
957 | continue; | |
625e9421 | 958 | install_packed_git(p); |
1f688557 | 959 | } |
5b35bcd5 | 960 | closedir(dir); |
1f688557 JH |
961 | } |
962 | ||
b867092f JH |
963 | static int sort_pack(const void *a_, const void *b_) |
964 | { | |
965 | struct packed_git *a = *((struct packed_git **)a_); | |
966 | struct packed_git *b = *((struct packed_git **)b_); | |
967 | int st; | |
968 | ||
969 | /* | |
970 | * Local packs tend to contain objects specific to our | |
971 | * variant of the project than remote ones. In addition, | |
972 | * remote ones could be on a network mounted filesystem. | |
973 | * Favor local ones for these reasons. | |
974 | */ | |
975 | st = a->pack_local - b->pack_local; | |
976 | if (st) | |
977 | return -st; | |
978 | ||
979 | /* | |
980 | * Younger packs tend to contain more recent objects, | |
981 | * and more recent objects tend to get accessed more | |
982 | * often. | |
983 | */ | |
984 | if (a->mtime < b->mtime) | |
985 | return 1; | |
986 | else if (a->mtime == b->mtime) | |
987 | return 0; | |
988 | return -1; | |
989 | } | |
990 | ||
991 | static void rearrange_packed_git(void) | |
992 | { | |
993 | struct packed_git **ary, *p; | |
994 | int i, n; | |
995 | ||
996 | for (n = 0, p = packed_git; p; p = p->next) | |
997 | n++; | |
998 | if (n < 2) | |
999 | return; | |
1000 | ||
1001 | /* prepare an array of packed_git for easier sorting */ | |
1002 | ary = xcalloc(n, sizeof(struct packed_git *)); | |
1003 | for (n = 0, p = packed_git; p; p = p->next) | |
1004 | ary[n++] = p; | |
1005 | ||
1006 | qsort(ary, n, sizeof(struct packed_git *), sort_pack); | |
1007 | ||
1008 | /* link them back again */ | |
1009 | for (i = 0; i < n - 1; i++) | |
1010 | ary[i]->next = ary[i + 1]; | |
1011 | ary[n - 1]->next = NULL; | |
1012 | packed_git = ary[0]; | |
1013 | ||
1014 | free(ary); | |
1015 | } | |
1016 | ||
637cdd9d | 1017 | static int prepare_packed_git_run_once = 0; |
9a217f2a | 1018 | void prepare_packed_git(void) |
1f688557 | 1019 | { |
d5a63b99 | 1020 | struct alternate_object_database *alt; |
1f688557 | 1021 | |
637cdd9d | 1022 | if (prepare_packed_git_run_once) |
1f688557 | 1023 | return; |
9d835df2 | 1024 | prepare_packed_git_one(get_object_directory(), 1); |
9a217f2a | 1025 | prepare_alt_odb(); |
d5a63b99 | 1026 | for (alt = alt_odb_list; alt; alt = alt->next) { |
1494e038 | 1027 | alt->name[-1] = 0; |
9d835df2 | 1028 | prepare_packed_git_one(alt->base, 0); |
1494e038 | 1029 | alt->name[-1] = '/'; |
1f688557 | 1030 | } |
b867092f | 1031 | rearrange_packed_git(); |
637cdd9d JK |
1032 | prepare_packed_git_run_once = 1; |
1033 | } | |
1034 | ||
fc04c412 | 1035 | void reprepare_packed_git(void) |
637cdd9d | 1036 | { |
4b480c67 | 1037 | discard_revindex(); |
637cdd9d JK |
1038 | prepare_packed_git_run_once = 0; |
1039 | prepare_packed_git(); | |
1f688557 JH |
1040 | } |
1041 | ||
8eca0b47 NP |
1042 | static void mark_bad_packed_object(struct packed_git *p, |
1043 | const unsigned char *sha1) | |
1044 | { | |
1045 | unsigned i; | |
1046 | for (i = 0; i < p->num_bad_objects; i++) | |
1047 | if (!hashcmp(sha1, p->bad_object_sha1 + 20 * i)) | |
1048 | return; | |
1049 | p->bad_object_sha1 = xrealloc(p->bad_object_sha1, 20 * (p->num_bad_objects + 1)); | |
1050 | hashcpy(p->bad_object_sha1 + 20 * p->num_bad_objects, sha1); | |
1051 | p->num_bad_objects++; | |
1052 | } | |
1053 | ||
ac939109 NP |
1054 | static int has_packed_and_bad(const unsigned char *sha1) |
1055 | { | |
1056 | struct packed_git *p; | |
1057 | unsigned i; | |
1058 | ||
1059 | for (p = packed_git; p; p = p->next) | |
1060 | for (i = 0; i < p->num_bad_objects; i++) | |
1061 | if (!hashcmp(sha1, p->bad_object_sha1 + 20 * i)) | |
1062 | return 1; | |
1063 | return 0; | |
1064 | } | |
1065 | ||
5d6ccf5c | 1066 | int check_sha1_signature(const unsigned char *sha1, void *map, unsigned long size, const char *type) |
0fcfd160 LT |
1067 | { |
1068 | unsigned char real_sha1[20]; | |
7cfb5f36 | 1069 | hash_sha1_file(map, size, type, real_sha1); |
a89fccd2 | 1070 | return hashcmp(sha1, real_sha1) ? -1 : 0; |
0fcfd160 LT |
1071 | } |
1072 | ||
44d1c19e LT |
1073 | static int git_open_noatime(const char *name) |
1074 | { | |
1075 | static int sha1_file_open_flag = O_NOATIME; | |
1076 | int fd = open(name, O_RDONLY | sha1_file_open_flag); | |
1077 | ||
1078 | /* Might the failure be due to O_NOATIME? */ | |
1079 | if (fd < 0 && errno != ENOENT && sha1_file_open_flag) { | |
1080 | fd = open(name, O_RDONLY); | |
1081 | if (fd >= 0) | |
1082 | sha1_file_open_flag = 0; | |
1083 | } | |
1084 | return fd; | |
1085 | } | |
1086 | ||
1087 | static int open_sha1_file(const unsigned char *sha1) | |
1088 | { | |
1089 | int fd; | |
1090 | char *name = sha1_file_name(sha1); | |
1091 | struct alternate_object_database *alt; | |
1092 | ||
1093 | fd = git_open_noatime(name); | |
1094 | if (fd >= 0) | |
1095 | return fd; | |
1096 | ||
1097 | prepare_alt_odb(); | |
1098 | errno = ENOENT; | |
1099 | for (alt = alt_odb_list; alt; alt = alt->next) { | |
1100 | name = alt->name; | |
1101 | fill_sha1_path(name, sha1); | |
1102 | fd = git_open_noatime(alt->base); | |
1103 | if (fd >= 0) | |
1104 | return fd; | |
1105 | } | |
1106 | return -1; | |
1107 | } | |
1108 | ||
4175e9e3 | 1109 | static void *map_sha1_file(const unsigned char *sha1, unsigned long *size) |
0fcfd160 | 1110 | { |
0fcfd160 | 1111 | void *map; |
144bde78 | 1112 | int fd; |
ace1534d | 1113 | |
44d1c19e LT |
1114 | fd = open_sha1_file(sha1); |
1115 | map = NULL; | |
1116 | if (fd >= 0) { | |
1117 | struct stat st; | |
0fcfd160 | 1118 | |
44d1c19e LT |
1119 | if (!fstat(fd, &st)) { |
1120 | *size = xsize_t(st.st_size); | |
1121 | map = xmmap(NULL, *size, PROT_READ, MAP_PRIVATE, fd, 0); | |
144bde78 | 1122 | } |
44d1c19e | 1123 | close(fd); |
0fcfd160 | 1124 | } |
0fcfd160 LT |
1125 | return map; |
1126 | } | |
1127 | ||
726f852b | 1128 | static int legacy_loose_object(unsigned char *map) |
bb6b8e4f JH |
1129 | { |
1130 | unsigned int word; | |
1131 | ||
1132 | /* | |
1133 | * Is it a zlib-compressed buffer? If so, the first byte | |
1134 | * must be 0x78 (15-bit window size, deflated), and the | |
1135 | * first 16-bit word is evenly divisible by 31 | |
1136 | */ | |
1137 | word = (map[0] << 8) + map[1]; | |
1138 | if (map[0] == 0x78 && !(word % 31)) | |
1139 | return 1; | |
1140 | else | |
1141 | return 0; | |
1142 | } | |
1143 | ||
72518e9c | 1144 | unsigned long unpack_object_header_gently(const unsigned char *buf, unsigned long len, enum object_type *type, unsigned long *sizep) |
c4483576 | 1145 | { |
ad1ed5ee | 1146 | unsigned shift; |
93821bd9 | 1147 | unsigned char c; |
93821bd9 | 1148 | unsigned long size; |
ad1ed5ee JH |
1149 | unsigned long used = 0; |
1150 | ||
1151 | c = buf[used++]; | |
1152 | *type = (c >> 4) & 7; | |
1153 | size = c & 15; | |
1154 | shift = 4; | |
1155 | while (c & 0x80) { | |
1156 | if (len <= used) | |
1157 | return 0; | |
1158 | if (sizeof(long) * 8 <= shift) | |
1159 | return 0; | |
1160 | c = buf[used++]; | |
1161 | size += (c & 0x7f) << shift; | |
1162 | shift += 7; | |
1163 | } | |
1164 | *sizep = size; | |
1165 | return used; | |
1166 | } | |
1167 | ||
1168 | static int unpack_sha1_header(z_stream *stream, unsigned char *map, unsigned long mapsize, void *buffer, unsigned long bufsiz) | |
1169 | { | |
1170 | unsigned long size, used; | |
1171 | static const char valid_loose_object_type[8] = { | |
1172 | 0, /* OBJ_EXT */ | |
1173 | 1, 1, 1, 1, /* "commit", "tree", "blob", "tag" */ | |
1174 | 0, /* "delta" and others are invalid in a loose object */ | |
93821bd9 | 1175 | }; |
ad1ed5ee | 1176 | enum object_type type; |
93821bd9 | 1177 | |
c4483576 LT |
1178 | /* Get the data stream */ |
1179 | memset(stream, 0, sizeof(*stream)); | |
1180 | stream->next_in = map; | |
1181 | stream->avail_in = mapsize; | |
1182 | stream->next_out = buffer; | |
93821bd9 LT |
1183 | stream->avail_out = bufsiz; |
1184 | ||
bb6b8e4f | 1185 | if (legacy_loose_object(map)) { |
93821bd9 LT |
1186 | inflateInit(stream); |
1187 | return inflate(stream, 0); | |
1188 | } | |
1189 | ||
726f852b NP |
1190 | |
1191 | /* | |
1192 | * There used to be a second loose object header format which | |
1193 | * was meant to mimic the in-pack format, allowing for direct | |
1194 | * copy of the object data. This format turned up not to be | |
1195 | * really worth it and we don't write it any longer. But we | |
1196 | * can still read it. | |
1197 | */ | |
ad1ed5ee JH |
1198 | used = unpack_object_header_gently(map, mapsize, &type, &size); |
1199 | if (!used || !valid_loose_object_type[type]) | |
93821bd9 | 1200 | return -1; |
ad1ed5ee JH |
1201 | map += used; |
1202 | mapsize -= used; | |
93821bd9 LT |
1203 | |
1204 | /* Set up the stream for the rest.. */ | |
1205 | stream->next_in = map; | |
1206 | stream->avail_in = mapsize; | |
c4483576 | 1207 | inflateInit(stream); |
93821bd9 LT |
1208 | |
1209 | /* And generate the fake traditional header */ | |
ad1ed5ee | 1210 | stream->total_out = 1 + snprintf(buffer, bufsiz, "%s %lu", |
df843662 | 1211 | typename(type), size); |
93821bd9 | 1212 | return 0; |
c4483576 LT |
1213 | } |
1214 | ||
7efbff75 | 1215 | static void *unpack_sha1_rest(z_stream *stream, void *buffer, unsigned long size, const unsigned char *sha1) |
5180cacc LT |
1216 | { |
1217 | int bytes = strlen(buffer) + 1; | |
d565b341 | 1218 | unsigned char *buf = xmalloc(1+size); |
93821bd9 | 1219 | unsigned long n; |
7efbff75 | 1220 | int status = Z_OK; |
5180cacc | 1221 | |
93821bd9 LT |
1222 | n = stream->total_out - bytes; |
1223 | if (n > size) | |
1224 | n = size; | |
1225 | memcpy(buf, (char *) buffer + bytes, n); | |
1226 | bytes = n; | |
456cdf6e LT |
1227 | if (bytes <= size) { |
1228 | /* | |
1229 | * The above condition must be (bytes <= size), not | |
1230 | * (bytes < size). In other words, even though we | |
1231 | * expect no more output and set avail_out to zer0, | |
1232 | * the input zlib stream may have bytes that express | |
1233 | * "this concludes the stream", and we *do* want to | |
1234 | * eat that input. | |
1235 | * | |
1236 | * Otherwise we would not be able to test that we | |
1237 | * consumed all the input to reach the expected size; | |
1238 | * we also want to check that zlib tells us that all | |
1239 | * went well with status == Z_STREAM_END at the end. | |
1240 | */ | |
5180cacc LT |
1241 | stream->next_out = buf + bytes; |
1242 | stream->avail_out = size - bytes; | |
7efbff75 JH |
1243 | while (status == Z_OK) |
1244 | status = inflate(stream, Z_FINISH); | |
5180cacc LT |
1245 | } |
1246 | buf[size] = 0; | |
456cdf6e | 1247 | if (status == Z_STREAM_END && !stream->avail_in) { |
7efbff75 JH |
1248 | inflateEnd(stream); |
1249 | return buf; | |
1250 | } | |
1251 | ||
1252 | if (status < 0) | |
1253 | error("corrupt loose object '%s'", sha1_to_hex(sha1)); | |
1254 | else if (stream->avail_in) | |
1255 | error("garbage at end of loose object '%s'", | |
1256 | sha1_to_hex(sha1)); | |
1257 | free(buf); | |
1258 | return NULL; | |
5180cacc LT |
1259 | } |
1260 | ||
1261 | /* | |
1262 | * We used to just use "sscanf()", but that's actually way | |
1263 | * too permissive for what we want to check. So do an anal | |
1264 | * object header parse by hand. | |
1265 | */ | |
21666f1a | 1266 | static int parse_sha1_header(const char *hdr, unsigned long *sizep) |
5180cacc | 1267 | { |
21666f1a | 1268 | char type[10]; |
5180cacc LT |
1269 | int i; |
1270 | unsigned long size; | |
1271 | ||
1272 | /* | |
a6080a0a | 1273 | * The type can be at most ten bytes (including the |
5180cacc | 1274 | * terminating '\0' that we add), and is followed by |
21666f1a | 1275 | * a space. |
5180cacc | 1276 | */ |
21666f1a | 1277 | i = 0; |
5180cacc LT |
1278 | for (;;) { |
1279 | char c = *hdr++; | |
1280 | if (c == ' ') | |
1281 | break; | |
21666f1a NP |
1282 | type[i++] = c; |
1283 | if (i >= sizeof(type)) | |
5180cacc | 1284 | return -1; |
5180cacc | 1285 | } |
21666f1a | 1286 | type[i] = 0; |
5180cacc LT |
1287 | |
1288 | /* | |
1289 | * The length must follow immediately, and be in canonical | |
1290 | * decimal format (ie "010" is not valid). | |
1291 | */ | |
1292 | size = *hdr++ - '0'; | |
1293 | if (size > 9) | |
1294 | return -1; | |
1295 | if (size) { | |
1296 | for (;;) { | |
1297 | unsigned long c = *hdr - '0'; | |
1298 | if (c > 9) | |
1299 | break; | |
1300 | hdr++; | |
1301 | size = size * 10 + c; | |
1302 | } | |
1303 | } | |
1304 | *sizep = size; | |
1305 | ||
1306 | /* | |
1307 | * The length must be followed by a zero byte | |
1308 | */ | |
21666f1a | 1309 | return *hdr ? -1 : type_from_string(type); |
5180cacc LT |
1310 | } |
1311 | ||
7efbff75 | 1312 | static void *unpack_sha1_file(void *map, unsigned long mapsize, enum object_type *type, unsigned long *size, const unsigned char *sha1) |
0fcfd160 | 1313 | { |
5180cacc | 1314 | int ret; |
0fcfd160 | 1315 | z_stream stream; |
5180cacc | 1316 | char hdr[8192]; |
0fcfd160 | 1317 | |
5180cacc | 1318 | ret = unpack_sha1_header(&stream, map, mapsize, hdr, sizeof(hdr)); |
21666f1a | 1319 | if (ret < Z_OK || (*type = parse_sha1_header(hdr, size)) < 0) |
0fcfd160 LT |
1320 | return NULL; |
1321 | ||
7efbff75 | 1322 | return unpack_sha1_rest(&stream, hdr, *size, sha1); |
0fcfd160 LT |
1323 | } |
1324 | ||
54dab52a NP |
1325 | unsigned long get_size_from_delta(struct packed_git *p, |
1326 | struct pack_window **w_curs, | |
1327 | off_t curpos) | |
1328 | { | |
1329 | const unsigned char *data; | |
1330 | unsigned char delta_head[20], *in; | |
1331 | z_stream stream; | |
1332 | int st; | |
1333 | ||
1334 | memset(&stream, 0, sizeof(stream)); | |
1335 | stream.next_out = delta_head; | |
1336 | stream.avail_out = sizeof(delta_head); | |
1337 | ||
1338 | inflateInit(&stream); | |
1339 | do { | |
1340 | in = use_pack(p, w_curs, curpos, &stream.avail_in); | |
1341 | stream.next_in = in; | |
1342 | st = inflate(&stream, Z_FINISH); | |
1343 | curpos += stream.next_in - in; | |
1344 | } while ((st == Z_OK || st == Z_BUF_ERROR) && | |
1345 | stream.total_out < sizeof(delta_head)); | |
1346 | inflateEnd(&stream); | |
1347 | if ((st != Z_STREAM_END) && stream.total_out != sizeof(delta_head)) | |
1348 | die("delta data unpack-initial failed"); | |
1349 | ||
1350 | /* Examine the initial part of the delta to figure out | |
1351 | * the result size. | |
1352 | */ | |
1353 | data = delta_head; | |
1354 | ||
1355 | /* ignore base size */ | |
1356 | get_delta_hdr_size(&data, delta_head+sizeof(delta_head)); | |
1357 | ||
1358 | /* Read the result size */ | |
1359 | return get_delta_hdr_size(&data, delta_head+sizeof(delta_head)); | |
1360 | } | |
1361 | ||
c4001d92 | 1362 | static off_t get_delta_base(struct packed_git *p, |
03e79c88 | 1363 | struct pack_window **w_curs, |
c4001d92 | 1364 | off_t *curpos, |
21666f1a | 1365 | enum object_type type, |
c4001d92 | 1366 | off_t delta_obj_offset) |
eb32d236 | 1367 | { |
2b87c45b | 1368 | unsigned char *base_info = use_pack(p, w_curs, *curpos, NULL); |
c4001d92 | 1369 | off_t base_offset; |
eb32d236 | 1370 | |
8d8a4ea5 SP |
1371 | /* use_pack() assured us we have [base_info, base_info + 20) |
1372 | * as a range that we can look at without walking off the | |
1373 | * end of the mapped window. Its actually the hash size | |
1374 | * that is assured. An OFS_DELTA longer than the hash size | |
1375 | * is stupid, as then a REF_DELTA would be smaller to store. | |
1376 | */ | |
21666f1a | 1377 | if (type == OBJ_OFS_DELTA) { |
eb32d236 NP |
1378 | unsigned used = 0; |
1379 | unsigned char c = base_info[used++]; | |
1380 | base_offset = c & 127; | |
1381 | while (c & 128) { | |
1382 | base_offset += 1; | |
8723f216 | 1383 | if (!base_offset || MSB(base_offset, 7)) |
8eca0b47 | 1384 | return 0; /* overflow */ |
eb32d236 NP |
1385 | c = base_info[used++]; |
1386 | base_offset = (base_offset << 7) + (c & 127); | |
1387 | } | |
1388 | base_offset = delta_obj_offset - base_offset; | |
1389 | if (base_offset >= delta_obj_offset) | |
8eca0b47 | 1390 | return 0; /* out of bound */ |
2b87c45b | 1391 | *curpos += used; |
21666f1a | 1392 | } else if (type == OBJ_REF_DELTA) { |
eb32d236 NP |
1393 | /* The base entry _must_ be in the same pack */ |
1394 | base_offset = find_pack_entry_one(base_info, p); | |
2b87c45b | 1395 | *curpos += 20; |
eb32d236 NP |
1396 | } else |
1397 | die("I am totally screwed"); | |
2b87c45b | 1398 | return base_offset; |
eb32d236 NP |
1399 | } |
1400 | ||
f3bf9224 | 1401 | /* forward declaration for a mutually recursive function */ |
c4001d92 | 1402 | static int packed_object_info(struct packed_git *p, off_t offset, |
21666f1a | 1403 | unsigned long *sizep); |
f3bf9224 | 1404 | |
43057304 | 1405 | static int packed_delta_info(struct packed_git *p, |
03e79c88 | 1406 | struct pack_window **w_curs, |
c4001d92 | 1407 | off_t curpos, |
21666f1a | 1408 | enum object_type type, |
c4001d92 | 1409 | off_t obj_offset, |
43057304 | 1410 | unsigned long *sizep) |
5db47c2b | 1411 | { |
c4001d92 | 1412 | off_t base_offset; |
f3bf9224 | 1413 | |
21666f1a NP |
1414 | base_offset = get_delta_base(p, w_curs, &curpos, type, obj_offset); |
1415 | type = packed_object_info(p, base_offset, NULL); | |
f3bf9224 | 1416 | |
c62266f3 JH |
1417 | /* We choose to only get the type of the base object and |
1418 | * ignore potentially corrupt pack file that expects the delta | |
1419 | * based on a base with a wrong size. This saves tons of | |
1420 | * inflate() calls. | |
1421 | */ | |
54dab52a NP |
1422 | if (sizep) |
1423 | *sizep = get_size_from_delta(p, w_curs, curpos); | |
21666f1a NP |
1424 | |
1425 | return type; | |
5db47c2b JH |
1426 | } |
1427 | ||
2b87c45b NP |
1428 | static int unpack_object_header(struct packed_git *p, |
1429 | struct pack_window **w_curs, | |
c4001d92 | 1430 | off_t *curpos, |
2b87c45b | 1431 | unsigned long *sizep) |
a733cb60 | 1432 | { |
03e79c88 SP |
1433 | unsigned char *base; |
1434 | unsigned int left; | |
ad1ed5ee | 1435 | unsigned long used; |
2b87c45b | 1436 | enum object_type type; |
a733cb60 | 1437 | |
8d8a4ea5 SP |
1438 | /* use_pack() assures us we have [base, base + 20) available |
1439 | * as a range that we can look at at. (Its actually the hash | |
3dff5379 | 1440 | * size that is assured.) With our object header encoding |
8d8a4ea5 SP |
1441 | * the maximum deflated object size is 2^137, which is just |
1442 | * insane, so we know won't exceed what we have been given. | |
1443 | */ | |
2b87c45b NP |
1444 | base = use_pack(p, w_curs, *curpos, &left); |
1445 | used = unpack_object_header_gently(base, left, &type, sizep); | |
ad1ed5ee JH |
1446 | if (!used) |
1447 | die("object offset outside of pack file"); | |
2b87c45b | 1448 | *curpos += used; |
ad1ed5ee | 1449 | |
2b87c45b | 1450 | return type; |
a733cb60 LT |
1451 | } |
1452 | ||
21666f1a | 1453 | const char *packed_object_info_detail(struct packed_git *p, |
c4001d92 | 1454 | off_t obj_offset, |
21666f1a NP |
1455 | unsigned long *size, |
1456 | unsigned long *store_size, | |
1457 | unsigned int *delta_chain_length, | |
1458 | unsigned char *base_sha1) | |
ad8c80a5 | 1459 | { |
03e79c88 | 1460 | struct pack_window *w_curs = NULL; |
c4001d92 SP |
1461 | off_t curpos; |
1462 | unsigned long dummy; | |
43057304 | 1463 | unsigned char *next_sha1; |
21666f1a | 1464 | enum object_type type; |
70f5d5d3 | 1465 | struct revindex_entry *revidx; |
ad8c80a5 | 1466 | |
43057304 | 1467 | *delta_chain_length = 0; |
2b87c45b | 1468 | curpos = obj_offset; |
21666f1a | 1469 | type = unpack_object_header(p, &w_curs, &curpos, size); |
43057304 | 1470 | |
70f5d5d3 NP |
1471 | revidx = find_pack_revindex(p, obj_offset); |
1472 | *store_size = revidx[1].offset - obj_offset; | |
1473 | ||
43057304 | 1474 | for (;;) { |
21666f1a | 1475 | switch (type) { |
43057304 | 1476 | default: |
08a19d87 | 1477 | die("pack %s contains unknown object type %d", |
21666f1a | 1478 | p->pack_name, type); |
43057304 NP |
1479 | case OBJ_COMMIT: |
1480 | case OBJ_TREE: | |
1481 | case OBJ_BLOB: | |
1482 | case OBJ_TAG: | |
03e79c88 | 1483 | unuse_pack(&w_curs); |
21666f1a | 1484 | return typename(type); |
eb32d236 | 1485 | case OBJ_OFS_DELTA: |
21666f1a | 1486 | obj_offset = get_delta_base(p, &w_curs, &curpos, type, obj_offset); |
8eca0b47 NP |
1487 | if (!obj_offset) |
1488 | die("pack %s contains bad delta base reference of type %s", | |
1489 | p->pack_name, typename(type)); | |
eb32d236 | 1490 | if (*delta_chain_length == 0) { |
70f5d5d3 NP |
1491 | revidx = find_pack_revindex(p, obj_offset); |
1492 | hashcpy(base_sha1, nth_packed_object_sha1(p, revidx->nr)); | |
eb32d236 NP |
1493 | } |
1494 | break; | |
1495 | case OBJ_REF_DELTA: | |
2b87c45b | 1496 | next_sha1 = use_pack(p, &w_curs, curpos, NULL); |
43057304 NP |
1497 | if (*delta_chain_length == 0) |
1498 | hashcpy(base_sha1, next_sha1); | |
2b87c45b | 1499 | obj_offset = find_pack_entry_one(next_sha1, p); |
43057304 NP |
1500 | break; |
1501 | } | |
43057304 | 1502 | (*delta_chain_length)++; |
2b87c45b | 1503 | curpos = obj_offset; |
21666f1a | 1504 | type = unpack_object_header(p, &w_curs, &curpos, &dummy); |
ad8c80a5 | 1505 | } |
ad8c80a5 JH |
1506 | } |
1507 | ||
c4001d92 | 1508 | static int packed_object_info(struct packed_git *p, off_t obj_offset, |
21666f1a | 1509 | unsigned long *sizep) |
1f688557 | 1510 | { |
03e79c88 | 1511 | struct pack_window *w_curs = NULL; |
c4001d92 SP |
1512 | unsigned long size; |
1513 | off_t curpos = obj_offset; | |
21666f1a | 1514 | enum object_type type; |
5db47c2b | 1515 | |
21666f1a | 1516 | type = unpack_object_header(p, &w_curs, &curpos, &size); |
5db47c2b | 1517 | |
21666f1a | 1518 | switch (type) { |
eb32d236 NP |
1519 | case OBJ_OFS_DELTA: |
1520 | case OBJ_REF_DELTA: | |
21666f1a NP |
1521 | type = packed_delta_info(p, &w_curs, curpos, |
1522 | type, obj_offset, sizep); | |
2b87c45b | 1523 | break; |
a733cb60 | 1524 | case OBJ_COMMIT: |
a733cb60 | 1525 | case OBJ_TREE: |
a733cb60 | 1526 | case OBJ_BLOB: |
a733cb60 | 1527 | case OBJ_TAG: |
2b87c45b NP |
1528 | if (sizep) |
1529 | *sizep = size; | |
a69d0943 | 1530 | break; |
1f688557 | 1531 | default: |
08a19d87 | 1532 | die("pack %s contains unknown object type %d", |
21666f1a | 1533 | p->pack_name, type); |
1f688557 | 1534 | } |
2b87c45b | 1535 | unuse_pack(&w_curs); |
21666f1a | 1536 | return type; |
1f688557 JH |
1537 | } |
1538 | ||
eb950c19 | 1539 | static void *unpack_compressed_entry(struct packed_git *p, |
03e79c88 | 1540 | struct pack_window **w_curs, |
c4001d92 | 1541 | off_t curpos, |
eb950c19 | 1542 | unsigned long size) |
de530aaa SP |
1543 | { |
1544 | int st; | |
1545 | z_stream stream; | |
079afb18 | 1546 | unsigned char *buffer, *in; |
de530aaa SP |
1547 | |
1548 | buffer = xmalloc(size + 1); | |
1549 | buffer[size] = 0; | |
1550 | memset(&stream, 0, sizeof(stream)); | |
de530aaa SP |
1551 | stream.next_out = buffer; |
1552 | stream.avail_out = size; | |
1553 | ||
1554 | inflateInit(&stream); | |
079afb18 | 1555 | do { |
2b87c45b | 1556 | in = use_pack(p, w_curs, curpos, &stream.avail_in); |
079afb18 SP |
1557 | stream.next_in = in; |
1558 | st = inflate(&stream, Z_FINISH); | |
2b87c45b | 1559 | curpos += stream.next_in - in; |
079afb18 | 1560 | } while (st == Z_OK || st == Z_BUF_ERROR); |
de530aaa SP |
1561 | inflateEnd(&stream); |
1562 | if ((st != Z_STREAM_END) || stream.total_out != size) { | |
1563 | free(buffer); | |
1564 | return NULL; | |
1565 | } | |
1566 | ||
1567 | return buffer; | |
1568 | } | |
1569 | ||
e5e01619 LT |
1570 | #define MAX_DELTA_CACHE (256) |
1571 | ||
18bdec11 | 1572 | static size_t delta_base_cached; |
5e08ecbf NP |
1573 | |
1574 | static struct delta_base_cache_lru_list { | |
1575 | struct delta_base_cache_lru_list *prev; | |
1576 | struct delta_base_cache_lru_list *next; | |
1577 | } delta_base_cache_lru = { &delta_base_cache_lru, &delta_base_cache_lru }; | |
1578 | ||
e5e01619 | 1579 | static struct delta_base_cache_entry { |
5e08ecbf NP |
1580 | struct delta_base_cache_lru_list lru; |
1581 | void *data; | |
e5e01619 LT |
1582 | struct packed_git *p; |
1583 | off_t base_offset; | |
1584 | unsigned long size; | |
e5e01619 LT |
1585 | enum object_type type; |
1586 | } delta_base_cache[MAX_DELTA_CACHE]; | |
1587 | ||
1588 | static unsigned long pack_entry_hash(struct packed_git *p, off_t base_offset) | |
1589 | { | |
1590 | unsigned long hash; | |
1591 | ||
1592 | hash = (unsigned long)p + (unsigned long)base_offset; | |
1593 | hash += (hash >> 8) + (hash >> 16); | |
3358004a | 1594 | return hash % MAX_DELTA_CACHE; |
e5e01619 LT |
1595 | } |
1596 | ||
62f255ad | 1597 | static void *cache_or_unpack_entry(struct packed_git *p, off_t base_offset, |
a0cba108 | 1598 | unsigned long *base_size, enum object_type *type, int keep_cache) |
62f255ad | 1599 | { |
e5e01619 LT |
1600 | void *ret; |
1601 | unsigned long hash = pack_entry_hash(p, base_offset); | |
1602 | struct delta_base_cache_entry *ent = delta_base_cache + hash; | |
1603 | ||
1604 | ret = ent->data; | |
1605 | if (ret && ent->p == p && ent->base_offset == base_offset) | |
1606 | goto found_cache_entry; | |
62f255ad | 1607 | return unpack_entry(p, base_offset, type, base_size); |
e5e01619 LT |
1608 | |
1609 | found_cache_entry: | |
18bdec11 | 1610 | if (!keep_cache) { |
a0cba108 | 1611 | ent->data = NULL; |
5e08ecbf NP |
1612 | ent->lru.next->prev = ent->lru.prev; |
1613 | ent->lru.prev->next = ent->lru.next; | |
18bdec11 | 1614 | delta_base_cached -= ent->size; |
182af834 PH |
1615 | } else { |
1616 | ret = xmemdupz(ent->data, ent->size); | |
a0cba108 | 1617 | } |
e5e01619 LT |
1618 | *type = ent->type; |
1619 | *base_size = ent->size; | |
1620 | return ret; | |
62f255ad LT |
1621 | } |
1622 | ||
18bdec11 SP |
1623 | static inline void release_delta_base_cache(struct delta_base_cache_entry *ent) |
1624 | { | |
1625 | if (ent->data) { | |
1626 | free(ent->data); | |
1627 | ent->data = NULL; | |
5e08ecbf NP |
1628 | ent->lru.next->prev = ent->lru.prev; |
1629 | ent->lru.prev->next = ent->lru.next; | |
18bdec11 SP |
1630 | delta_base_cached -= ent->size; |
1631 | } | |
1632 | } | |
1633 | ||
3d20c636 SP |
1634 | void clear_delta_base_cache(void) |
1635 | { | |
1636 | unsigned long p; | |
1637 | for (p = 0; p < MAX_DELTA_CACHE; p++) | |
1638 | release_delta_base_cache(&delta_base_cache[p]); | |
1639 | } | |
1640 | ||
62f255ad LT |
1641 | static void add_delta_base_cache(struct packed_git *p, off_t base_offset, |
1642 | void *base, unsigned long base_size, enum object_type type) | |
1643 | { | |
5e08ecbf | 1644 | unsigned long hash = pack_entry_hash(p, base_offset); |
e5e01619 | 1645 | struct delta_base_cache_entry *ent = delta_base_cache + hash; |
5e08ecbf | 1646 | struct delta_base_cache_lru_list *lru; |
e5e01619 | 1647 | |
18bdec11 SP |
1648 | release_delta_base_cache(ent); |
1649 | delta_base_cached += base_size; | |
5e08ecbf NP |
1650 | |
1651 | for (lru = delta_base_cache_lru.next; | |
1652 | delta_base_cached > delta_base_cache_limit | |
1653 | && lru != &delta_base_cache_lru; | |
1654 | lru = lru->next) { | |
1655 | struct delta_base_cache_entry *f = (void *)lru; | |
18bdec11 SP |
1656 | if (f->type == OBJ_BLOB) |
1657 | release_delta_base_cache(f); | |
1658 | } | |
5e08ecbf NP |
1659 | for (lru = delta_base_cache_lru.next; |
1660 | delta_base_cached > delta_base_cache_limit | |
1661 | && lru != &delta_base_cache_lru; | |
1662 | lru = lru->next) { | |
1663 | struct delta_base_cache_entry *f = (void *)lru; | |
1664 | release_delta_base_cache(f); | |
1665 | } | |
18bdec11 | 1666 | |
e5e01619 LT |
1667 | ent->p = p; |
1668 | ent->base_offset = base_offset; | |
1669 | ent->type = type; | |
1670 | ent->data = base; | |
1671 | ent->size = base_size; | |
5e08ecbf NP |
1672 | ent->lru.next = &delta_base_cache_lru; |
1673 | ent->lru.prev = delta_base_cache_lru.prev; | |
1674 | delta_base_cache_lru.prev->next = &ent->lru; | |
1675 | delta_base_cache_lru.prev = &ent->lru; | |
62f255ad LT |
1676 | } |
1677 | ||
eb950c19 | 1678 | static void *unpack_delta_entry(struct packed_git *p, |
03e79c88 | 1679 | struct pack_window **w_curs, |
c4001d92 | 1680 | off_t curpos, |
1f688557 | 1681 | unsigned long delta_size, |
c4001d92 | 1682 | off_t obj_offset, |
21666f1a | 1683 | enum object_type *type, |
eb950c19 | 1684 | unsigned long *sizep) |
1f688557 | 1685 | { |
7c3e8be3 | 1686 | void *delta_data, *result, *base; |
c4001d92 SP |
1687 | unsigned long base_size; |
1688 | off_t base_offset; | |
43057304 | 1689 | |
21666f1a | 1690 | base_offset = get_delta_base(p, w_curs, &curpos, *type, obj_offset); |
8eca0b47 NP |
1691 | if (!base_offset) { |
1692 | error("failed to validate delta base reference " | |
1693 | "at offset %"PRIuMAX" from %s", | |
1694 | (uintmax_t)curpos, p->pack_name); | |
1695 | return NULL; | |
1696 | } | |
eac12e2d | 1697 | unuse_pack(w_curs); |
a0cba108 | 1698 | base = cache_or_unpack_entry(p, base_offset, &base_size, type, 0); |
8eca0b47 NP |
1699 | if (!base) { |
1700 | /* | |
1701 | * We're probably in deep shit, but let's try to fetch | |
1702 | * the required base anyway from another pack or loose. | |
1703 | * This is costly but should happen only in the presence | |
1704 | * of a corrupted pack, and is better than failing outright. | |
1705 | */ | |
1706 | struct revindex_entry *revidx = find_pack_revindex(p, base_offset); | |
1707 | const unsigned char *base_sha1 = | |
1708 | nth_packed_object_sha1(p, revidx->nr); | |
1709 | error("failed to read delta base object %s" | |
1710 | " at offset %"PRIuMAX" from %s", | |
1711 | sha1_to_hex(base_sha1), (uintmax_t)base_offset, | |
1712 | p->pack_name); | |
1713 | mark_bad_packed_object(p, base_sha1); | |
ac939109 | 1714 | base = read_object(base_sha1, type, &base_size); |
8eca0b47 NP |
1715 | if (!base) |
1716 | return NULL; | |
1717 | } | |
67686d95 | 1718 | |
2b87c45b | 1719 | delta_data = unpack_compressed_entry(p, w_curs, curpos, delta_size); |
8eca0b47 NP |
1720 | if (!delta_data) { |
1721 | error("failed to unpack compressed delta " | |
1722 | "at offset %"PRIuMAX" from %s", | |
1723 | (uintmax_t)curpos, p->pack_name); | |
1724 | free(base); | |
1725 | return NULL; | |
1726 | } | |
1f688557 JH |
1727 | result = patch_delta(base, base_size, |
1728 | delta_data, delta_size, | |
21666f1a | 1729 | sizep); |
1f688557 JH |
1730 | if (!result) |
1731 | die("failed to apply delta"); | |
1732 | free(delta_data); | |
62f255ad | 1733 | add_delta_base_cache(p, base_offset, base, base_size, *type); |
1f688557 JH |
1734 | return result; |
1735 | } | |
1736 | ||
c4001d92 | 1737 | void *unpack_entry(struct packed_git *p, off_t obj_offset, |
21666f1a | 1738 | enum object_type *type, unsigned long *sizep) |
1f688557 | 1739 | { |
03e79c88 | 1740 | struct pack_window *w_curs = NULL; |
c4001d92 | 1741 | off_t curpos = obj_offset; |
21666f1a | 1742 | void *data; |
1f688557 | 1743 | |
21666f1a NP |
1744 | *type = unpack_object_header(p, &w_curs, &curpos, sizep); |
1745 | switch (*type) { | |
eb32d236 NP |
1746 | case OBJ_OFS_DELTA: |
1747 | case OBJ_REF_DELTA: | |
21666f1a NP |
1748 | data = unpack_delta_entry(p, &w_curs, curpos, *sizep, |
1749 | obj_offset, type, sizep); | |
4d703a1a | 1750 | break; |
a733cb60 | 1751 | case OBJ_COMMIT: |
a733cb60 | 1752 | case OBJ_TREE: |
a733cb60 | 1753 | case OBJ_BLOB: |
a733cb60 | 1754 | case OBJ_TAG: |
21666f1a | 1755 | data = unpack_compressed_entry(p, &w_curs, curpos, *sizep); |
4d703a1a | 1756 | break; |
1f688557 | 1757 | default: |
8eca0b47 NP |
1758 | data = NULL; |
1759 | error("unknown object type %i at offset %"PRIuMAX" in %s", | |
1760 | *type, (uintmax_t)obj_offset, p->pack_name); | |
1f688557 | 1761 | } |
03e79c88 | 1762 | unuse_pack(&w_curs); |
21666f1a | 1763 | return data; |
1f688557 JH |
1764 | } |
1765 | ||
d079837e | 1766 | const unsigned char *nth_packed_object_sha1(struct packed_git *p, |
d72308e0 | 1767 | uint32_t n) |
9a217f2a | 1768 | { |
42873078 | 1769 | const unsigned char *index = p->index_data; |
d079837e SP |
1770 | if (!index) { |
1771 | if (open_pack_index(p)) | |
1772 | return NULL; | |
1773 | index = p->index_data; | |
1774 | } | |
57059091 | 1775 | if (n >= p->num_objects) |
d72308e0 | 1776 | return NULL; |
74e34e1f NP |
1777 | index += 4 * 256; |
1778 | if (p->index_version == 1) { | |
1779 | return index + 24 * n + 4; | |
1780 | } else { | |
1781 | index += 8; | |
1782 | return index + 20 * n; | |
1783 | } | |
1784 | } | |
1785 | ||
99093238 | 1786 | off_t nth_packed_object_offset(const struct packed_git *p, uint32_t n) |
74e34e1f NP |
1787 | { |
1788 | const unsigned char *index = p->index_data; | |
1789 | index += 4 * 256; | |
1790 | if (p->index_version == 1) { | |
1791 | return ntohl(*((uint32_t *)(index + 24 * n))); | |
1792 | } else { | |
1793 | uint32_t off; | |
1794 | index += 8 + p->num_objects * (20 + 4); | |
1795 | off = ntohl(*((uint32_t *)(index + 4 * n))); | |
1796 | if (!(off & 0x80000000)) | |
1797 | return off; | |
1798 | index += p->num_objects * 4 + (off & 0x7fffffff) * 8; | |
1799 | return (((uint64_t)ntohl(*((uint32_t *)(index + 0)))) << 32) | | |
1800 | ntohl(*((uint32_t *)(index + 4))); | |
1801 | } | |
9a217f2a JH |
1802 | } |
1803 | ||
c4001d92 | 1804 | off_t find_pack_entry_one(const unsigned char *sha1, |
43057304 | 1805 | struct packed_git *p) |
1f688557 | 1806 | { |
42873078 | 1807 | const uint32_t *level1_ofs = p->index_data; |
42873078 | 1808 | const unsigned char *index = p->index_data; |
628522ec JH |
1809 | unsigned hi, lo, stride; |
1810 | static int use_lookup = -1; | |
1811 | static int debug_lookup = -1; | |
1812 | ||
1813 | if (debug_lookup < 0) | |
1814 | debug_lookup = !!getenv("GIT_DEBUG_LOOKUP"); | |
42873078 | 1815 | |
d079837e SP |
1816 | if (!index) { |
1817 | if (open_pack_index(p)) | |
1818 | return 0; | |
1819 | level1_ofs = p->index_data; | |
1820 | index = p->index_data; | |
1821 | } | |
74e34e1f NP |
1822 | if (p->index_version > 1) { |
1823 | level1_ofs += 2; | |
1824 | index += 8; | |
1825 | } | |
42873078 | 1826 | index += 4 * 256; |
74e34e1f NP |
1827 | hi = ntohl(level1_ofs[*sha1]); |
1828 | lo = ((*sha1 == 0x0) ? 0 : ntohl(level1_ofs[*sha1 - 1])); | |
628522ec JH |
1829 | if (p->index_version > 1) { |
1830 | stride = 20; | |
1831 | } else { | |
1832 | stride = 24; | |
1833 | index += 4; | |
1834 | } | |
1835 | ||
1836 | if (debug_lookup) | |
6e1c2344 | 1837 | printf("%02x%02x%02x... lo %u hi %u nr %"PRIu32"\n", |
628522ec JH |
1838 | sha1[0], sha1[1], sha1[2], lo, hi, p->num_objects); |
1839 | ||
1840 | if (use_lookup < 0) | |
1841 | use_lookup = !!getenv("GIT_USE_LOOKUP"); | |
1842 | if (use_lookup) { | |
1843 | int pos = sha1_entry_pos(index, stride, 0, | |
1844 | lo, hi, p->num_objects, sha1); | |
1845 | if (pos < 0) | |
1846 | return 0; | |
1847 | return nth_packed_object_offset(p, pos); | |
1848 | } | |
1f688557 JH |
1849 | |
1850 | do { | |
74e34e1f | 1851 | unsigned mi = (lo + hi) / 2; |
628522ec JH |
1852 | int cmp = hashcmp(index + mi * stride, sha1); |
1853 | ||
1854 | if (debug_lookup) | |
1855 | printf("lo %u hi %u rg %u mi %u\n", | |
1856 | lo, hi, hi - lo, mi); | |
43057304 | 1857 | if (!cmp) |
74e34e1f | 1858 | return nth_packed_object_offset(p, mi); |
1f688557 JH |
1859 | if (cmp > 0) |
1860 | hi = mi; | |
1861 | else | |
1862 | lo = mi+1; | |
1863 | } while (lo < hi); | |
1864 | return 0; | |
1865 | } | |
1866 | ||
000dfd3f | 1867 | int matches_pack_name(struct packed_git *p, const char *name) |
d4ff6d92 SP |
1868 | { |
1869 | const char *last_c, *c; | |
1870 | ||
000dfd3f JH |
1871 | if (!strcmp(p->pack_name, name)) |
1872 | return 1; | |
d4ff6d92 SP |
1873 | |
1874 | for (c = p->pack_name, last_c = c; *c;) | |
1875 | if (*c == '/') | |
1876 | last_c = ++c; | |
1877 | else | |
1878 | ++c; | |
000dfd3f JH |
1879 | if (!strcmp(last_c, name)) |
1880 | return 1; | |
d4ff6d92 | 1881 | |
000dfd3f | 1882 | return 0; |
d4ff6d92 SP |
1883 | } |
1884 | ||
106d710b | 1885 | static int find_pack_entry(const unsigned char *sha1, struct pack_entry *e, const char **ignore_packed) |
1f688557 | 1886 | { |
f7c22cc6 | 1887 | static struct packed_git *last_found = (void *)1; |
1f688557 | 1888 | struct packed_git *p; |
c4001d92 | 1889 | off_t offset; |
43057304 | 1890 | |
1f688557 | 1891 | prepare_packed_git(); |
f7c22cc6 NP |
1892 | if (!packed_git) |
1893 | return 0; | |
1894 | p = (last_found == (void *)1) ? packed_git : last_found; | |
1f688557 | 1895 | |
f7c22cc6 | 1896 | do { |
106d710b JH |
1897 | if (ignore_packed) { |
1898 | const char **ig; | |
1899 | for (ig = ignore_packed; *ig; ig++) | |
000dfd3f | 1900 | if (matches_pack_name(p, *ig)) |
106d710b JH |
1901 | break; |
1902 | if (*ig) | |
f7c22cc6 | 1903 | goto next; |
106d710b | 1904 | } |
f7c22cc6 | 1905 | |
8eca0b47 NP |
1906 | if (p->num_bad_objects) { |
1907 | unsigned i; | |
1908 | for (i = 0; i < p->num_bad_objects; i++) | |
1909 | if (!hashcmp(sha1, p->bad_object_sha1 + 20 * i)) | |
1910 | goto next; | |
1911 | } | |
1912 | ||
43057304 NP |
1913 | offset = find_pack_entry_one(sha1, p); |
1914 | if (offset) { | |
c715f783 SP |
1915 | /* |
1916 | * We are about to tell the caller where they can | |
1917 | * locate the requested object. We better make | |
1918 | * sure the packfile is still here and can be | |
1919 | * accessed before supplying that answer, as | |
1920 | * it may have been deleted since the index | |
1921 | * was loaded! | |
1922 | */ | |
1923 | if (p->pack_fd == -1 && open_packed_git(p)) { | |
1924 | error("packfile %s cannot be accessed", p->pack_name); | |
f7c22cc6 | 1925 | goto next; |
c715f783 | 1926 | } |
43057304 NP |
1927 | e->offset = offset; |
1928 | e->p = p; | |
1929 | hashcpy(e->sha1, sha1); | |
f7c22cc6 | 1930 | last_found = p; |
1f688557 | 1931 | return 1; |
43057304 | 1932 | } |
f7c22cc6 NP |
1933 | |
1934 | next: | |
1935 | if (p == last_found) | |
1936 | p = packed_git; | |
1937 | else | |
1938 | p = p->next; | |
1939 | if (p == last_found) | |
1940 | p = p->next; | |
1941 | } while (p); | |
1f688557 JH |
1942 | return 0; |
1943 | } | |
1944 | ||
a6080a0a | 1945 | struct packed_git *find_sha1_pack(const unsigned char *sha1, |
bf592c50 DB |
1946 | struct packed_git *packs) |
1947 | { | |
1948 | struct packed_git *p; | |
bf592c50 DB |
1949 | |
1950 | for (p = packs; p; p = p->next) { | |
43057304 | 1951 | if (find_pack_entry_one(sha1, p)) |
bf592c50 DB |
1952 | return p; |
1953 | } | |
1954 | return NULL; | |
21666f1a | 1955 | |
bf592c50 DB |
1956 | } |
1957 | ||
21666f1a | 1958 | static int sha1_loose_object_info(const unsigned char *sha1, unsigned long *sizep) |
65c2e0c3 | 1959 | { |
36e4d74a | 1960 | int status; |
65c2e0c3 JH |
1961 | unsigned long mapsize, size; |
1962 | void *map; | |
1963 | z_stream stream; | |
d65a16f6 | 1964 | char hdr[32]; |
65c2e0c3 | 1965 | |
bb6b8e4f | 1966 | map = map_sha1_file(sha1, &mapsize); |
f0df4ed5 JS |
1967 | if (!map) |
1968 | return error("unable to find %s", sha1_to_hex(sha1)); | |
36e4d74a JH |
1969 | if (unpack_sha1_header(&stream, map, mapsize, hdr, sizeof(hdr)) < 0) |
1970 | status = error("unable to unpack %s header", | |
1971 | sha1_to_hex(sha1)); | |
21666f1a | 1972 | else if ((status = parse_sha1_header(hdr, &size)) < 0) |
36e4d74a | 1973 | status = error("unable to parse %s header", sha1_to_hex(sha1)); |
21666f1a NP |
1974 | else if (sizep) |
1975 | *sizep = size; | |
65c2e0c3 JH |
1976 | inflateEnd(&stream); |
1977 | munmap(map, mapsize); | |
1978 | return status; | |
1979 | } | |
1980 | ||
21666f1a | 1981 | int sha1_object_info(const unsigned char *sha1, unsigned long *sizep) |
f0df4ed5 | 1982 | { |
f0df4ed5 | 1983 | struct pack_entry e; |
ddd63e64 | 1984 | int status; |
f0df4ed5 JS |
1985 | |
1986 | if (!find_pack_entry(sha1, &e, NULL)) { | |
ddd63e64 SG |
1987 | /* Most likely it's a loose object. */ |
1988 | status = sha1_loose_object_info(sha1, sizep); | |
1989 | if (status >= 0) | |
1990 | return status; | |
1991 | ||
1992 | /* Not a loose object; someone else may have just packed it. */ | |
f0df4ed5 JS |
1993 | reprepare_packed_git(); |
1994 | if (!find_pack_entry(sha1, &e, NULL)) | |
ddd63e64 | 1995 | return status; |
f0df4ed5 | 1996 | } |
21666f1a | 1997 | return packed_object_info(e.p, e.offset, sizep); |
f0df4ed5 JS |
1998 | } |
1999 | ||
21666f1a NP |
2000 | static void *read_packed_sha1(const unsigned char *sha1, |
2001 | enum object_type *type, unsigned long *size) | |
1f688557 JH |
2002 | { |
2003 | struct pack_entry e; | |
8eca0b47 | 2004 | void *data; |
1f688557 | 2005 | |
8276c007 | 2006 | if (!find_pack_entry(sha1, &e, NULL)) |
1f688557 | 2007 | return NULL; |
8eca0b47 NP |
2008 | data = cache_or_unpack_entry(e.p, e.offset, size, type, 1); |
2009 | if (!data) { | |
2010 | /* | |
2011 | * We're probably in deep shit, but let's try to fetch | |
2012 | * the required object anyway from another pack or loose. | |
2013 | * This should happen only in the presence of a corrupted | |
2014 | * pack, and is better than failing outright. | |
2015 | */ | |
2016 | error("failed to read object %s at offset %"PRIuMAX" from %s", | |
2017 | sha1_to_hex(sha1), (uintmax_t)e.offset, e.p->pack_name); | |
2018 | mark_bad_packed_object(e.p, sha1); | |
ac939109 | 2019 | data = read_object(sha1, type, size); |
8eca0b47 NP |
2020 | } |
2021 | return data; | |
1f688557 JH |
2022 | } |
2023 | ||
d66b37bb JH |
2024 | /* |
2025 | * This is meant to hold a *small* number of objects that you would | |
2026 | * want read_sha1_file() to be able to return, but yet you do not want | |
2027 | * to write them into the object store (e.g. a browse-only | |
2028 | * application). | |
2029 | */ | |
2030 | static struct cached_object { | |
2031 | unsigned char sha1[20]; | |
21666f1a | 2032 | enum object_type type; |
d66b37bb JH |
2033 | void *buf; |
2034 | unsigned long size; | |
2035 | } *cached_objects; | |
2036 | static int cached_object_nr, cached_object_alloc; | |
2037 | ||
346245a1 JK |
2038 | static struct cached_object empty_tree = { |
2039 | /* empty tree sha1: 4b825dc642cb6eb9a060e54bf8d69288fbee4904 */ | |
2040 | "\x4b\x82\x5d\xc6\x42\xcb\x6e\xb9\xa0\x60" | |
2041 | "\xe5\x4b\xf8\xd6\x92\x88\xfb\xee\x49\x04", | |
2042 | OBJ_TREE, | |
2043 | "", | |
2044 | 0 | |
2045 | }; | |
2046 | ||
d66b37bb JH |
2047 | static struct cached_object *find_cached_object(const unsigned char *sha1) |
2048 | { | |
2049 | int i; | |
2050 | struct cached_object *co = cached_objects; | |
2051 | ||
2052 | for (i = 0; i < cached_object_nr; i++, co++) { | |
2053 | if (!hashcmp(co->sha1, sha1)) | |
2054 | return co; | |
2055 | } | |
346245a1 JK |
2056 | if (!hashcmp(sha1, empty_tree.sha1)) |
2057 | return &empty_tree; | |
d66b37bb JH |
2058 | return NULL; |
2059 | } | |
2060 | ||
21666f1a NP |
2061 | int pretend_sha1_file(void *buf, unsigned long len, enum object_type type, |
2062 | unsigned char *sha1) | |
d66b37bb JH |
2063 | { |
2064 | struct cached_object *co; | |
2065 | ||
21666f1a | 2066 | hash_sha1_file(buf, len, typename(type), sha1); |
d66b37bb JH |
2067 | if (has_sha1_file(sha1) || find_cached_object(sha1)) |
2068 | return 0; | |
2069 | if (cached_object_alloc <= cached_object_nr) { | |
2070 | cached_object_alloc = alloc_nr(cached_object_alloc); | |
2071 | cached_objects = xrealloc(cached_objects, | |
2072 | sizeof(*cached_objects) * | |
2073 | cached_object_alloc); | |
2074 | } | |
2075 | co = &cached_objects[cached_object_nr++]; | |
2076 | co->size = len; | |
21666f1a | 2077 | co->type = type; |
efa13f7b JH |
2078 | co->buf = xmalloc(len); |
2079 | memcpy(co->buf, buf, len); | |
d66b37bb JH |
2080 | hashcpy(co->sha1, sha1); |
2081 | return 0; | |
2082 | } | |
2083 | ||
ac939109 NP |
2084 | void *read_object(const unsigned char *sha1, enum object_type *type, |
2085 | unsigned long *size) | |
0fcfd160 LT |
2086 | { |
2087 | unsigned long mapsize; | |
2088 | void *map, *buf; | |
d66b37bb JH |
2089 | struct cached_object *co; |
2090 | ||
2091 | co = find_cached_object(sha1); | |
2092 | if (co) { | |
21666f1a | 2093 | *type = co->type; |
d66b37bb | 2094 | *size = co->size; |
182af834 | 2095 | return xmemdupz(co->buf, co->size); |
d66b37bb | 2096 | } |
0fcfd160 | 2097 | |
8276c007 PE |
2098 | buf = read_packed_sha1(sha1, type, size); |
2099 | if (buf) | |
2100 | return buf; | |
bb6b8e4f | 2101 | map = map_sha1_file(sha1, &mapsize); |
0fcfd160 | 2102 | if (map) { |
7efbff75 | 2103 | buf = unpack_sha1_file(map, mapsize, type, size, sha1); |
0fcfd160 LT |
2104 | munmap(map, mapsize); |
2105 | return buf; | |
2106 | } | |
637cdd9d | 2107 | reprepare_packed_git(); |
8276c007 | 2108 | return read_packed_sha1(sha1, type, size); |
0fcfd160 LT |
2109 | } |
2110 | ||
ac939109 NP |
2111 | void *read_sha1_file(const unsigned char *sha1, enum object_type *type, |
2112 | unsigned long *size) | |
2113 | { | |
2114 | void *data = read_object(sha1, type, size); | |
2115 | /* legacy behavior is to die on corrupted objects */ | |
2116 | if (!data && (has_loose_object(sha1) || has_packed_and_bad(sha1))) | |
2117 | die("object %s is corrupted", sha1_to_hex(sha1)); | |
2118 | return data; | |
2119 | } | |
2120 | ||
40469ee9 | 2121 | void *read_object_with_reference(const unsigned char *sha1, |
21666f1a | 2122 | const char *required_type_name, |
40469ee9 JH |
2123 | unsigned long *size, |
2124 | unsigned char *actual_sha1_return) | |
f4913f91 | 2125 | { |
21666f1a | 2126 | enum object_type type, required_type; |
f4913f91 JH |
2127 | void *buffer; |
2128 | unsigned long isize; | |
40469ee9 | 2129 | unsigned char actual_sha1[20]; |
f4913f91 | 2130 | |
21666f1a | 2131 | required_type = type_from_string(required_type_name); |
e702496e | 2132 | hashcpy(actual_sha1, sha1); |
40469ee9 JH |
2133 | while (1) { |
2134 | int ref_length = -1; | |
2135 | const char *ref_type = NULL; | |
f4913f91 | 2136 | |
21666f1a | 2137 | buffer = read_sha1_file(actual_sha1, &type, &isize); |
40469ee9 JH |
2138 | if (!buffer) |
2139 | return NULL; | |
21666f1a | 2140 | if (type == required_type) { |
40469ee9 JH |
2141 | *size = isize; |
2142 | if (actual_sha1_return) | |
e702496e | 2143 | hashcpy(actual_sha1_return, actual_sha1); |
40469ee9 JH |
2144 | return buffer; |
2145 | } | |
2146 | /* Handle references */ | |
21666f1a | 2147 | else if (type == OBJ_COMMIT) |
40469ee9 | 2148 | ref_type = "tree "; |
21666f1a | 2149 | else if (type == OBJ_TAG) |
40469ee9 JH |
2150 | ref_type = "object "; |
2151 | else { | |
2152 | free(buffer); | |
2153 | return NULL; | |
2154 | } | |
2155 | ref_length = strlen(ref_type); | |
f4913f91 | 2156 | |
50974ec9 MK |
2157 | if (ref_length + 40 > isize || |
2158 | memcmp(buffer, ref_type, ref_length) || | |
1d7f171c | 2159 | get_sha1_hex((char *) buffer + ref_length, actual_sha1)) { |
40469ee9 JH |
2160 | free(buffer); |
2161 | return NULL; | |
2162 | } | |
1cf58e72 | 2163 | free(buffer); |
40469ee9 JH |
2164 | /* Now we have the ID of the referred-to object in |
2165 | * actual_sha1. Check again. */ | |
f4913f91 | 2166 | } |
f4913f91 JH |
2167 | } |
2168 | ||
ce9fbf16 | 2169 | static void write_sha1_file_prepare(const void *buf, unsigned long len, |
972a9155 | 2170 | const char *type, unsigned char *sha1, |
d65a16f6 | 2171 | char *hdr, int *hdrlen) |
d410c0f5 JH |
2172 | { |
2173 | SHA_CTX c; | |
2174 | ||
2175 | /* Generate the header */ | |
d65a16f6 | 2176 | *hdrlen = sprintf(hdr, "%s %lu", type, len)+1; |
d410c0f5 JH |
2177 | |
2178 | /* Sha1.. */ | |
2179 | SHA1_Init(&c); | |
2180 | SHA1_Update(&c, hdr, *hdrlen); | |
2181 | SHA1_Update(&c, buf, len); | |
2182 | SHA1_Final(sha1, &c); | |
d410c0f5 JH |
2183 | } |
2184 | ||
230f1322 LT |
2185 | /* |
2186 | * Move the just written object into its final resting place | |
2187 | */ | |
839837b9 | 2188 | int move_temp_to_file(const char *tmpfile, const char *filename) |
230f1322 | 2189 | { |
e32c0a9c TR |
2190 | int ret = 0; |
2191 | if (link(tmpfile, filename)) | |
2192 | ret = errno; | |
7ebb6fca LT |
2193 | |
2194 | /* | |
2195 | * Coda hack - coda doesn't like cross-directory links, | |
2196 | * so we fall back to a rename, which will mean that it | |
2197 | * won't be able to check collisions, but that's not a | |
2198 | * big deal. | |
2199 | * | |
2200 | * The same holds for FAT formatted media. | |
2201 | * | |
2202 | * When this succeeds, we just return 0. We have nothing | |
2203 | * left to unlink. | |
2204 | */ | |
2205 | if (ret && ret != EEXIST) { | |
2206 | if (!rename(tmpfile, filename)) | |
230f1322 | 2207 | return 0; |
9e48b389 | 2208 | ret = errno; |
230f1322 LT |
2209 | } |
2210 | unlink(tmpfile); | |
2211 | if (ret) { | |
2212 | if (ret != EEXIST) { | |
916d081b | 2213 | return error("unable to write sha1 filename %s: %s\n", filename, strerror(ret)); |
230f1322 LT |
2214 | } |
2215 | /* FIXME!!! Collision check here ? */ | |
2216 | } | |
2217 | ||
2218 | return 0; | |
2219 | } | |
2220 | ||
4d548150 LT |
2221 | static int write_buffer(int fd, const void *buf, size_t len) |
2222 | { | |
d34cf19b | 2223 | if (write_in_full(fd, buf, len) < 0) |
93822c22 | 2224 | return error("file write error (%s)", strerror(errno)); |
4d548150 LT |
2225 | return 0; |
2226 | } | |
2227 | ||
ce9fbf16 | 2228 | int hash_sha1_file(const void *buf, unsigned long len, const char *type, |
abdc3fc8 RS |
2229 | unsigned char *sha1) |
2230 | { | |
d65a16f6 | 2231 | char hdr[32]; |
abdc3fc8 RS |
2232 | int hdrlen; |
2233 | write_sha1_file_prepare(buf, len, type, sha1, hdr, &hdrlen); | |
2234 | return 0; | |
2235 | } | |
2236 | ||
e9039dd3 LT |
2237 | /* Finalize a file on disk, and close it. */ |
2238 | static void close_sha1_file(int fd) | |
2239 | { | |
aafe9fba LT |
2240 | if (fsync_object_files) |
2241 | fsync_or_die(fd, "sha1 file"); | |
e9039dd3 LT |
2242 | fchmod(fd, 0444); |
2243 | if (close(fd) != 0) | |
2244 | die("unable to write sha1 file"); | |
2245 | } | |
2246 | ||
5723fe7e LT |
2247 | /* Size of directory component, including the ending '/' */ |
2248 | static inline int directory_size(const char *filename) | |
2249 | { | |
2250 | const char *s = strrchr(filename, '/'); | |
2251 | if (!s) | |
2252 | return 0; | |
2253 | return s - filename + 1; | |
2254 | } | |
2255 | ||
2256 | /* | |
2257 | * This creates a temporary file in the same directory as the final | |
2258 | * 'filename' | |
2259 | * | |
2260 | * We want to avoid cross-directory filename renames, because those | |
2261 | * can have problems on various filesystems (FAT, NFS, Coda). | |
2262 | */ | |
2263 | static int create_tmpfile(char *buffer, size_t bufsiz, const char *filename) | |
2264 | { | |
2265 | int fd, dirlen = directory_size(filename); | |
2266 | ||
2267 | if (dirlen + 20 > bufsiz) { | |
2268 | errno = ENAMETOOLONG; | |
2269 | return -1; | |
2270 | } | |
2271 | memcpy(buffer, filename, dirlen); | |
2272 | strcpy(buffer + dirlen, "tmp_obj_XXXXXX"); | |
2273 | fd = mkstemp(buffer); | |
65117abc | 2274 | if (fd < 0 && dirlen && errno == ENOENT) { |
5723fe7e | 2275 | /* Make sure the directory exists */ |
6ff6af62 | 2276 | memcpy(buffer, filename, dirlen); |
5723fe7e | 2277 | buffer[dirlen-1] = 0; |
3bfaf018 | 2278 | if (mkdir(buffer, 0777) || adjust_shared_perm(buffer)) |
5723fe7e LT |
2279 | return -1; |
2280 | ||
2281 | /* Try again */ | |
2282 | strcpy(buffer + dirlen - 1, "/tmp_obj_XXXXXX"); | |
2283 | fd = mkstemp(buffer); | |
2284 | } | |
2285 | return fd; | |
2286 | } | |
2287 | ||
bbac7311 NP |
2288 | static int write_loose_object(const unsigned char *sha1, char *hdr, int hdrlen, |
2289 | void *buf, unsigned long len, time_t mtime) | |
0fcfd160 | 2290 | { |
915308b1 JK |
2291 | int fd, ret; |
2292 | size_t size; | |
bf0f910d | 2293 | unsigned char *compressed; |
0fcfd160 | 2294 | z_stream stream; |
706bc531 | 2295 | char *filename; |
aac17941 | 2296 | static char tmpfile[PATH_MAX]; |
a44c9a5e | 2297 | |
972a9155 | 2298 | filename = sha1_file_name(sha1); |
5723fe7e | 2299 | fd = create_tmpfile(tmpfile, sizeof(tmpfile), filename); |
aac17941 | 2300 | if (fd < 0) { |
35243577 | 2301 | if (errno == EACCES) |
916d081b PB |
2302 | return error("insufficient permission for adding an object to repository database %s\n", get_object_directory()); |
2303 | else | |
2304 | return error("unable to create temporary sha1 filename %s: %s\n", tmpfile, strerror(errno)); | |
aac17941 LT |
2305 | } |
2306 | ||
0fcfd160 LT |
2307 | /* Set it up */ |
2308 | memset(&stream, 0, sizeof(stream)); | |
12f6c308 | 2309 | deflateInit(&stream, zlib_compression_level); |
93821bd9 | 2310 | size = 8 + deflateBound(&stream, len+hdrlen); |
812666c8 | 2311 | compressed = xmalloc(size); |
0fcfd160 LT |
2312 | |
2313 | /* Compress it */ | |
0fcfd160 LT |
2314 | stream.next_out = compressed; |
2315 | stream.avail_out = size; | |
a44c9a5e LT |
2316 | |
2317 | /* First header.. */ | |
d65a16f6 | 2318 | stream.next_in = (unsigned char *)hdr; |
a44c9a5e | 2319 | stream.avail_in = hdrlen; |
726f852b NP |
2320 | while (deflate(&stream, 0) == Z_OK) |
2321 | /* nothing */; | |
a44c9a5e LT |
2322 | |
2323 | /* Then the data itself.. */ | |
2324 | stream.next_in = buf; | |
2325 | stream.avail_in = len; | |
ac54c277 LT |
2326 | ret = deflate(&stream, Z_FINISH); |
2327 | if (ret != Z_STREAM_END) | |
2328 | die("unable to deflate new object %s (%d)", sha1_to_hex(sha1), ret); | |
2329 | ||
2330 | ret = deflateEnd(&stream); | |
2331 | if (ret != Z_OK) | |
2332 | die("deflateEnd on object %s failed (%d)", sha1_to_hex(sha1), ret); | |
2333 | ||
0fcfd160 LT |
2334 | size = stream.total_out; |
2335 | ||
4d548150 LT |
2336 | if (write_buffer(fd, compressed, size) < 0) |
2337 | die("unable to write sha1 file"); | |
e9039dd3 | 2338 | close_sha1_file(fd); |
383f85b7 | 2339 | free(compressed); |
0fcfd160 | 2340 | |
bbac7311 NP |
2341 | if (mtime) { |
2342 | struct utimbuf utb; | |
2343 | utb.actime = mtime; | |
2344 | utb.modtime = mtime; | |
2345 | if (utime(tmpfile, &utb) < 0) | |
2346 | warning("failed utime() on %s: %s", | |
2347 | tmpfile, strerror(errno)); | |
2348 | } | |
2349 | ||
230f1322 | 2350 | return move_temp_to_file(tmpfile, filename); |
0fcfd160 | 2351 | } |
8237b185 | 2352 | |
bbac7311 NP |
2353 | int write_sha1_file(void *buf, unsigned long len, const char *type, unsigned char *returnsha1) |
2354 | { | |
2355 | unsigned char sha1[20]; | |
2356 | char hdr[32]; | |
2357 | int hdrlen; | |
2358 | ||
2359 | /* Normally if we have it in the pack then we do not bother writing | |
2360 | * it out into .git/objects/??/?{38} file. | |
2361 | */ | |
2362 | write_sha1_file_prepare(buf, len, type, sha1, hdr, &hdrlen); | |
2363 | if (returnsha1) | |
2364 | hashcpy(returnsha1, sha1); | |
2365 | if (has_sha1_file(sha1)) | |
2366 | return 0; | |
2367 | return write_loose_object(sha1, hdr, hdrlen, buf, len, 0); | |
2368 | } | |
2369 | ||
2370 | int force_object_loose(const unsigned char *sha1, time_t mtime) | |
2371 | { | |
bbac7311 NP |
2372 | void *buf; |
2373 | unsigned long len; | |
2374 | enum object_type type; | |
2375 | char hdr[32]; | |
2376 | int hdrlen; | |
1fb23e65 | 2377 | int ret; |
bbac7311 | 2378 | |
c529d75a | 2379 | if (has_loose_object(sha1)) |
bbac7311 NP |
2380 | return 0; |
2381 | buf = read_packed_sha1(sha1, &type, &len); | |
2382 | if (!buf) | |
2383 | return error("cannot read sha1_file for %s", sha1_to_hex(sha1)); | |
2384 | hdrlen = sprintf(hdr, "%s %lu", typename(type), len) + 1; | |
1fb23e65 BS |
2385 | ret = write_loose_object(sha1, hdr, hdrlen, buf, len, mtime); |
2386 | free(buf); | |
2387 | ||
2388 | return ret; | |
bbac7311 NP |
2389 | } |
2390 | ||
bf592c50 DB |
2391 | int has_pack_index(const unsigned char *sha1) |
2392 | { | |
2393 | struct stat st; | |
2394 | if (stat(sha1_pack_index_name(sha1), &st)) | |
2395 | return 0; | |
2396 | return 1; | |
2397 | } | |
2398 | ||
2399 | int has_pack_file(const unsigned char *sha1) | |
2400 | { | |
2401 | struct stat st; | |
2402 | if (stat(sha1_pack_name(sha1), &st)) | |
2403 | return 0; | |
2404 | return 1; | |
2405 | } | |
2406 | ||
106d710b | 2407 | int has_sha1_pack(const unsigned char *sha1, const char **ignore_packed) |
dade09c2 LT |
2408 | { |
2409 | struct pack_entry e; | |
106d710b | 2410 | return find_pack_entry(sha1, &e, ignore_packed); |
dade09c2 LT |
2411 | } |
2412 | ||
8237b185 DB |
2413 | int has_sha1_file(const unsigned char *sha1) |
2414 | { | |
1f688557 JH |
2415 | struct pack_entry e; |
2416 | ||
106d710b | 2417 | if (find_pack_entry(sha1, &e, NULL)) |
1f688557 | 2418 | return 1; |
c529d75a | 2419 | return has_loose_object(sha1); |
8237b185 | 2420 | } |
74400e71 | 2421 | |
e7332f96 BE |
2422 | int index_pipe(unsigned char *sha1, int fd, const char *type, int write_object) |
2423 | { | |
fd17f5b5 | 2424 | struct strbuf buf; |
e7332f96 | 2425 | int ret; |
e7332f96 | 2426 | |
fd17f5b5 PH |
2427 | strbuf_init(&buf, 0); |
2428 | if (strbuf_read(&buf, fd, 4096) < 0) { | |
2429 | strbuf_release(&buf); | |
024510c8 DB |
2430 | return -1; |
2431 | } | |
e7332f96 | 2432 | |
024510c8 | 2433 | if (!type) |
8e440259 | 2434 | type = blob_type; |
024510c8 | 2435 | if (write_object) |
fd17f5b5 | 2436 | ret = write_sha1_file(buf.buf, buf.len, type, sha1); |
abdc3fc8 | 2437 | else |
fd17f5b5 PH |
2438 | ret = hash_sha1_file(buf.buf, buf.len, type, sha1); |
2439 | strbuf_release(&buf); | |
2440 | ||
024510c8 DB |
2441 | return ret; |
2442 | } | |
2443 | ||
edaec3fb | 2444 | int index_fd(unsigned char *sha1, int fd, struct stat *st, int write_object, |
53bca91a | 2445 | enum object_type type, const char *path) |
74400e71 | 2446 | { |
dc49cd76 | 2447 | size_t size = xsize_t(st->st_size); |
3a55602e | 2448 | void *buf = NULL; |
6c510bee | 2449 | int ret, re_allocated = 0; |
74400e71 | 2450 | |
74400e71 | 2451 | if (size) |
c4712e45 | 2452 | buf = xmmap(NULL, size, PROT_READ, MAP_PRIVATE, fd, 0); |
74400e71 | 2453 | close(fd); |
74400e71 | 2454 | |
7672db20 | 2455 | if (!type) |
edaec3fb | 2456 | type = OBJ_BLOB; |
6c510bee LT |
2457 | |
2458 | /* | |
2459 | * Convert blobs to git internal format | |
2460 | */ | |
d0d8e14d | 2461 | if ((type == OBJ_BLOB) && S_ISREG(st->st_mode)) { |
5ecd293d PH |
2462 | struct strbuf nbuf; |
2463 | strbuf_init(&nbuf, 0); | |
21e5ad50 SP |
2464 | if (convert_to_git(path, buf, size, &nbuf, |
2465 | write_object ? safe_crlf : 0)) { | |
ac78e548 | 2466 | munmap(buf, size); |
b315c5c0 | 2467 | buf = strbuf_detach(&nbuf, &size); |
6c510bee LT |
2468 | re_allocated = 1; |
2469 | } | |
2470 | } | |
2471 | ||
7672db20 | 2472 | if (write_object) |
edaec3fb | 2473 | ret = write_sha1_file(buf, size, typename(type), sha1); |
abdc3fc8 | 2474 | else |
edaec3fb | 2475 | ret = hash_sha1_file(buf, size, typename(type), sha1); |
6c510bee LT |
2476 | if (re_allocated) { |
2477 | free(buf); | |
2478 | return ret; | |
2479 | } | |
aac17941 LT |
2480 | if (size) |
2481 | munmap(buf, size); | |
2482 | return ret; | |
74400e71 | 2483 | } |
ec1fcc16 JH |
2484 | |
2485 | int index_path(unsigned char *sha1, const char *path, struct stat *st, int write_object) | |
2486 | { | |
2487 | int fd; | |
2488 | char *target; | |
dc49cd76 | 2489 | size_t len; |
ec1fcc16 JH |
2490 | |
2491 | switch (st->st_mode & S_IFMT) { | |
2492 | case S_IFREG: | |
2493 | fd = open(path, O_RDONLY); | |
2494 | if (fd < 0) | |
2495 | return error("open(\"%s\"): %s", path, | |
2496 | strerror(errno)); | |
53bca91a | 2497 | if (index_fd(sha1, fd, st, write_object, OBJ_BLOB, path) < 0) |
ec1fcc16 JH |
2498 | return error("%s: failed to insert into database", |
2499 | path); | |
2500 | break; | |
2501 | case S_IFLNK: | |
dc49cd76 SP |
2502 | len = xsize_t(st->st_size); |
2503 | target = xmalloc(len + 1); | |
2504 | if (readlink(path, target, len + 1) != st->st_size) { | |
ec1fcc16 JH |
2505 | char *errstr = strerror(errno); |
2506 | free(target); | |
2507 | return error("readlink(\"%s\"): %s", path, | |
2508 | errstr); | |
2509 | } | |
abdc3fc8 | 2510 | if (!write_object) |
dc49cd76 SP |
2511 | hash_sha1_file(target, len, blob_type, sha1); |
2512 | else if (write_sha1_file(target, len, blob_type, sha1)) | |
ec1fcc16 JH |
2513 | return error("%s: failed to insert into database", |
2514 | path); | |
2515 | free(target); | |
2516 | break; | |
f35a6d3b LT |
2517 | case S_IFDIR: |
2518 | return resolve_gitlink_ref(path, "HEAD", sha1); | |
ec1fcc16 JH |
2519 | default: |
2520 | return error("%s: unsupported file type", path); | |
2521 | } | |
2522 | return 0; | |
2523 | } | |
a69e5429 JH |
2524 | |
2525 | int read_pack_header(int fd, struct pack_header *header) | |
2526 | { | |
c697ad14 HO |
2527 | if (read_in_full(fd, header, sizeof(*header)) < sizeof(*header)) |
2528 | /* "eof before pack header was fully read" */ | |
2529 | return PH_ERROR_EOF; | |
2530 | ||
a69e5429 JH |
2531 | if (header->hdr_signature != htonl(PACK_SIGNATURE)) |
2532 | /* "protocol error (pack signature mismatch detected)" */ | |
2533 | return PH_ERROR_PACK_SIGNATURE; | |
2534 | if (!pack_version_ok(header->hdr_version)) | |
2535 | /* "protocol error (pack version unsupported)" */ | |
2536 | return PH_ERROR_PROTOCOL; | |
2537 | return 0; | |
2538 | } |