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