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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 | ||
b2cb9425 JH |
86 | int safe_create_leading_directories(char *path) |
87 | { | |
88 | char *pos = path; | |
67d42212 JR |
89 | struct stat st; |
90 | ||
85dadc38 | 91 | if (is_absolute_path(path)) |
67ffdf4c | 92 | pos++; |
b2cb9425 JH |
93 | |
94 | while (pos) { | |
95 | pos = strchr(pos, '/'); | |
96 | if (!pos) | |
97 | break; | |
98 | *pos = 0; | |
67d42212 JR |
99 | if (!stat(path, &st)) { |
100 | /* path exists */ | |
101 | if (!S_ISDIR(st.st_mode)) { | |
b2cb9425 | 102 | *pos = '/'; |
67d42212 | 103 | return -3; |
b2cb9425 | 104 | } |
457f06d6 | 105 | } |
67d42212 JR |
106 | else if (mkdir(path, 0777)) { |
107 | *pos = '/'; | |
108 | return -1; | |
109 | } | |
457f06d6 JS |
110 | else if (adjust_shared_perm(path)) { |
111 | *pos = '/'; | |
112 | return -2; | |
113 | } | |
b2cb9425 JH |
114 | *pos++ = '/'; |
115 | } | |
116 | return 0; | |
117 | } | |
723c31fe | 118 | |
3bfaf018 | 119 | char *sha1_to_hex(const unsigned char *sha1) |
0fcfd160 | 120 | { |
dcb3450f LT |
121 | static int bufno; |
122 | static char hexbuffer[4][50]; | |
0fcfd160 | 123 | static const char hex[] = "0123456789abcdef"; |
dcb3450f | 124 | char *buffer = hexbuffer[3 & ++bufno], *buf = buffer; |
0fcfd160 LT |
125 | int i; |
126 | ||
127 | for (i = 0; i < 20; i++) { | |
128 | unsigned int val = *sha1++; | |
129 | *buf++ = hex[val >> 4]; | |
130 | *buf++ = hex[val & 0xf]; | |
131 | } | |
1e80e044 JS |
132 | *buf = '\0'; |
133 | ||
0fcfd160 LT |
134 | return buffer; |
135 | } | |
136 | ||
ace1534d JH |
137 | static void fill_sha1_path(char *pathbuf, const unsigned char *sha1) |
138 | { | |
139 | int i; | |
140 | for (i = 0; i < 20; i++) { | |
141 | static char hex[] = "0123456789abcdef"; | |
142 | unsigned int val = sha1[i]; | |
143 | char *pos = pathbuf + i*2 + (i > 0); | |
144 | *pos++ = hex[val >> 4]; | |
145 | *pos = hex[val & 0xf]; | |
146 | } | |
147 | } | |
148 | ||
0fcfd160 LT |
149 | /* |
150 | * NOTE! This returns a statically allocated buffer, so you have to be | |
790296fd | 151 | * careful about using it. Do an "xstrdup()" if you need to save the |
0fcfd160 | 152 | * filename. |
ace1534d JH |
153 | * |
154 | * Also note that this returns the location for creating. Reading | |
155 | * SHA1 file can happen from any alternate directory listed in the | |
d19938ab | 156 | * DB_ENVIRONMENT environment variable if it is not found in |
ace1534d | 157 | * the primary object database. |
0fcfd160 LT |
158 | */ |
159 | char *sha1_file_name(const unsigned char *sha1) | |
160 | { | |
0fcfd160 LT |
161 | static char *name, *base; |
162 | ||
163 | if (!base) { | |
d19938ab | 164 | const char *sha1_file_directory = get_object_directory(); |
0fcfd160 | 165 | int len = strlen(sha1_file_directory); |
812666c8 | 166 | base = xmalloc(len + 60); |
0fcfd160 LT |
167 | memcpy(base, sha1_file_directory, len); |
168 | memset(base+len, 0, 60); | |
169 | base[len] = '/'; | |
170 | base[len+3] = '/'; | |
171 | name = base + len + 1; | |
172 | } | |
ace1534d | 173 | fill_sha1_path(name, sha1); |
0fcfd160 LT |
174 | return base; |
175 | } | |
176 | ||
633f43e1 | 177 | static char *sha1_get_pack_name(const unsigned char *sha1, |
6eec46bd | 178 | char **name, char **base, const char *which) |
bf592c50 DB |
179 | { |
180 | static const char hex[] = "0123456789abcdef"; | |
633f43e1 | 181 | char *buf; |
bf592c50 DB |
182 | int i; |
183 | ||
633f43e1 | 184 | if (!*base) { |
bf592c50 DB |
185 | const char *sha1_file_directory = get_object_directory(); |
186 | int len = strlen(sha1_file_directory); | |
633f43e1 | 187 | *base = xmalloc(len + 60); |
6eec46bd JH |
188 | sprintf(*base, "%s/pack/pack-1234567890123456789012345678901234567890.%s", |
189 | sha1_file_directory, which); | |
633f43e1 | 190 | *name = *base + len + 11; |
bf592c50 DB |
191 | } |
192 | ||
633f43e1 | 193 | buf = *name; |
bf592c50 DB |
194 | |
195 | for (i = 0; i < 20; i++) { | |
196 | unsigned int val = *sha1++; | |
197 | *buf++ = hex[val >> 4]; | |
198 | *buf++ = hex[val & 0xf]; | |
199 | } | |
a6080a0a | 200 | |
633f43e1 | 201 | return *base; |
bf592c50 DB |
202 | } |
203 | ||
633f43e1 | 204 | char *sha1_pack_name(const unsigned char *sha1) |
bf592c50 | 205 | { |
633f43e1 | 206 | static char *name, *base; |
bf592c50 | 207 | |
6eec46bd | 208 | return sha1_get_pack_name(sha1, &name, &base, "pack"); |
633f43e1 | 209 | } |
bf592c50 | 210 | |
633f43e1 HO |
211 | char *sha1_pack_index_name(const unsigned char *sha1) |
212 | { | |
213 | static char *name, *base; | |
a6080a0a | 214 | |
6eec46bd | 215 | return sha1_get_pack_name(sha1, &name, &base, "idx"); |
bf592c50 DB |
216 | } |
217 | ||
d5a63b99 JH |
218 | struct alternate_object_database *alt_odb_list; |
219 | static struct alternate_object_database **alt_odb_tail; | |
ace1534d | 220 | |
c2f493a4 MW |
221 | static void read_info_alternates(const char * alternates, int depth); |
222 | ||
ddd5d056 JH |
223 | /* |
224 | * Prepare alternate object database registry. | |
d5a63b99 JH |
225 | * |
226 | * The variable alt_odb_list points at the list of struct | |
227 | * alternate_object_database. The elements on this list come from | |
228 | * non-empty elements from colon separated ALTERNATE_DB_ENVIRONMENT | |
229 | * environment variable, and $GIT_OBJECT_DIRECTORY/info/alternates, | |
1494e038 JH |
230 | * whose contents is similar to that environment variable but can be |
231 | * LF separated. Its base points at a statically allocated buffer that | |
d5a63b99 JH |
232 | * contains "/the/directory/corresponding/to/.git/objects/...", while |
233 | * its name points just after the slash at the end of ".git/objects/" | |
234 | * in the example above, and has enough space to hold 40-byte hex | |
235 | * SHA1, an extra slash for the first level indirection, and the | |
236 | * terminating NUL. | |
ddd5d056 | 237 | */ |
c2f493a4 | 238 | static int link_alt_odb_entry(const char * entry, int len, const char * relative_base, int depth) |
ace1534d | 239 | { |
c2f493a4 | 240 | struct stat st; |
1494e038 | 241 | const char *objdir = get_object_directory(); |
c2f493a4 MW |
242 | struct alternate_object_database *ent; |
243 | struct alternate_object_database *alt; | |
244 | /* 43 = 40-byte + 2 '/' + terminating NUL */ | |
245 | int pfxlen = len; | |
246 | int entlen = pfxlen + 43; | |
ccfd3e99 | 247 | int base_len = -1; |
d5a63b99 | 248 | |
85dadc38 | 249 | if (!is_absolute_path(entry) && relative_base) { |
c2f493a4 MW |
250 | /* Relative alt-odb */ |
251 | if (base_len < 0) | |
252 | base_len = strlen(relative_base) + 1; | |
253 | entlen += base_len; | |
254 | pfxlen += base_len; | |
255 | } | |
256 | ent = xmalloc(sizeof(*ent) + entlen); | |
257 | ||
85dadc38 | 258 | if (!is_absolute_path(entry) && relative_base) { |
c2f493a4 MW |
259 | memcpy(ent->base, relative_base, base_len - 1); |
260 | ent->base[base_len - 1] = '/'; | |
261 | memcpy(ent->base + base_len, entry, len); | |
262 | } | |
263 | else | |
264 | memcpy(ent->base, entry, pfxlen); | |
265 | ||
266 | ent->name = ent->base + pfxlen + 1; | |
267 | ent->base[pfxlen + 3] = '/'; | |
268 | ent->base[pfxlen] = ent->base[entlen-1] = 0; | |
269 | ||
270 | /* Detect cases where alternate disappeared */ | |
271 | if (stat(ent->base, &st) || !S_ISDIR(st.st_mode)) { | |
272 | error("object directory %s does not exist; " | |
273 | "check .git/objects/info/alternates.", | |
274 | ent->base); | |
275 | free(ent); | |
276 | return -1; | |
277 | } | |
278 | ||
279 | /* Prevent the common mistake of listing the same | |
280 | * thing twice, or object directory itself. | |
281 | */ | |
282 | for (alt = alt_odb_list; alt; alt = alt->next) { | |
283 | if (!memcmp(ent->base, alt->base, pfxlen)) { | |
284 | free(ent); | |
285 | return -1; | |
286 | } | |
287 | } | |
288 | if (!memcmp(ent->base, objdir, pfxlen)) { | |
289 | free(ent); | |
290 | return -1; | |
291 | } | |
292 | ||
293 | /* add the alternate entry */ | |
294 | *alt_odb_tail = ent; | |
295 | alt_odb_tail = &(ent->next); | |
296 | ent->next = NULL; | |
297 | ||
298 | /* recursively add alternates */ | |
299 | read_info_alternates(ent->base, depth + 1); | |
300 | ||
301 | ent->base[pfxlen] = '/'; | |
302 | ||
303 | return 0; | |
304 | } | |
305 | ||
306 | static void link_alt_odb_entries(const char *alt, const char *ep, int sep, | |
307 | const char *relative_base, int depth) | |
308 | { | |
309 | const char *cp, *last; | |
310 | ||
311 | if (depth > 5) { | |
312 | error("%s: ignoring alternate object stores, nesting too deep.", | |
313 | relative_base); | |
314 | return; | |
315 | } | |
316 | ||
d5a63b99 | 317 | last = alt; |
9577e7e3 JH |
318 | while (last < ep) { |
319 | cp = last; | |
320 | if (cp < ep && *cp == '#') { | |
321 | while (cp < ep && *cp != sep) | |
322 | cp++; | |
323 | last = cp + 1; | |
324 | continue; | |
325 | } | |
c2f493a4 MW |
326 | while (cp < ep && *cp != sep) |
327 | cp++; | |
d5a63b99 | 328 | if (last != cp) { |
85dadc38 | 329 | if (!is_absolute_path(last) && depth) { |
c2f493a4 MW |
330 | error("%s: ignoring relative alternate object store %s", |
331 | relative_base, last); | |
332 | } else { | |
333 | link_alt_odb_entry(last, cp - last, | |
334 | relative_base, depth); | |
1494e038 | 335 | } |
d5a63b99 | 336 | } |
9577e7e3 | 337 | while (cp < ep && *cp == sep) |
d5a63b99 JH |
338 | cp++; |
339 | last = cp; | |
9577e7e3 | 340 | } |
d5a63b99 JH |
341 | } |
342 | ||
c2f493a4 | 343 | static void read_info_alternates(const char * relative_base, int depth) |
d5a63b99 | 344 | { |
9577e7e3 | 345 | char *map; |
dc49cd76 | 346 | size_t mapsz; |
d5a63b99 | 347 | struct stat st; |
9cb18f56 JM |
348 | const char alt_file_name[] = "info/alternates"; |
349 | /* Given that relative_base is no longer than PATH_MAX, | |
350 | ensure that "path" has enough space to append "/", the | |
351 | file name, "info/alternates", and a trailing NUL. */ | |
352 | char path[PATH_MAX + 1 + sizeof alt_file_name]; | |
c2f493a4 | 353 | int fd; |
d5a63b99 | 354 | |
9cb18f56 | 355 | sprintf(path, "%s/%s", relative_base, alt_file_name); |
d5a63b99 JH |
356 | fd = open(path, O_RDONLY); |
357 | if (fd < 0) | |
358 | return; | |
359 | if (fstat(fd, &st) || (st.st_size == 0)) { | |
360 | close(fd); | |
9a217f2a | 361 | return; |
ace1534d | 362 | } |
dc49cd76 SP |
363 | mapsz = xsize_t(st.st_size); |
364 | map = xmmap(NULL, mapsz, PROT_READ, MAP_PRIVATE, fd, 0); | |
d5a63b99 | 365 | close(fd); |
d5a63b99 | 366 | |
dc49cd76 | 367 | link_alt_odb_entries(map, map + mapsz, '\n', relative_base, depth); |
c2f493a4 | 368 | |
dc49cd76 | 369 | munmap(map, mapsz); |
ace1534d JH |
370 | } |
371 | ||
bef70b22 DB |
372 | void add_to_alternates_file(const char *reference) |
373 | { | |
374 | struct lock_file *lock = xcalloc(1, sizeof(struct lock_file)); | |
375 | int fd = hold_lock_file_for_append(lock, git_path("objects/info/alternates"), 1); | |
376 | char *alt = mkpath("%s/objects\n", reference); | |
377 | write_or_die(fd, alt, strlen(alt)); | |
378 | if (commit_lock_file(lock)) | |
379 | die("could not close alternates file"); | |
380 | if (alt_odb_tail) | |
381 | link_alt_odb_entries(alt, alt + strlen(alt), '\n', NULL, 0); | |
382 | } | |
383 | ||
c2f493a4 MW |
384 | void prepare_alt_odb(void) |
385 | { | |
554fe20d | 386 | const char *alt; |
c2f493a4 | 387 | |
7dc24aa5 SP |
388 | if (alt_odb_tail) |
389 | return; | |
390 | ||
c2f493a4 MW |
391 | alt = getenv(ALTERNATE_DB_ENVIRONMENT); |
392 | if (!alt) alt = ""; | |
393 | ||
c2f493a4 | 394 | alt_odb_tail = &alt_odb_list; |
80ba074f | 395 | link_alt_odb_entries(alt, alt + strlen(alt), PATH_SEP, NULL, 0); |
c2f493a4 MW |
396 | |
397 | read_info_alternates(get_object_directory(), 0); | |
398 | } | |
399 | ||
c529d75a | 400 | static int has_loose_object(const unsigned char *sha1) |
ace1534d | 401 | { |
ace1534d | 402 | char *name = sha1_file_name(sha1); |
d5a63b99 | 403 | struct alternate_object_database *alt; |
ace1534d | 404 | |
c529d75a LT |
405 | if (!access(name, F_OK)) |
406 | return 1; | |
9a217f2a | 407 | prepare_alt_odb(); |
d5a63b99 JH |
408 | for (alt = alt_odb_list; alt; alt = alt->next) { |
409 | name = alt->name; | |
ace1534d | 410 | fill_sha1_path(name, sha1); |
c529d75a LT |
411 | if (!access(alt->base, F_OK)) |
412 | return 1; | |
ace1534d | 413 | } |
c529d75a | 414 | return 0; |
ace1534d JH |
415 | } |
416 | ||
60bb8b14 | 417 | static unsigned int pack_used_ctr; |
a53128b6 SP |
418 | static unsigned int pack_mmap_calls; |
419 | static unsigned int peak_pack_open_windows; | |
420 | static unsigned int pack_open_windows; | |
421 | static size_t peak_pack_mapped; | |
60bb8b14 | 422 | static size_t pack_mapped; |
9a217f2a | 423 | struct packed_git *packed_git; |
1f688557 | 424 | |
b79d18c9 | 425 | void pack_report(void) |
a53128b6 SP |
426 | { |
427 | fprintf(stderr, | |
e05db0fd PR |
428 | "pack_report: getpagesize() = %10" SZ_FMT "\n" |
429 | "pack_report: core.packedGitWindowSize = %10" SZ_FMT "\n" | |
430 | "pack_report: core.packedGitLimit = %10" SZ_FMT "\n", | |
9e42d6a1 SP |
431 | sz_fmt(getpagesize()), |
432 | sz_fmt(packed_git_window_size), | |
433 | sz_fmt(packed_git_limit)); | |
a53128b6 SP |
434 | fprintf(stderr, |
435 | "pack_report: pack_used_ctr = %10u\n" | |
436 | "pack_report: pack_mmap_calls = %10u\n" | |
437 | "pack_report: pack_open_windows = %10u / %10u\n" | |
e05db0fd PR |
438 | "pack_report: pack_mapped = " |
439 | "%10" SZ_FMT " / %10" SZ_FMT "\n", | |
a53128b6 SP |
440 | pack_used_ctr, |
441 | pack_mmap_calls, | |
442 | pack_open_windows, peak_pack_open_windows, | |
9e42d6a1 | 443 | sz_fmt(pack_mapped), sz_fmt(peak_pack_mapped)); |
a53128b6 SP |
444 | } |
445 | ||
42873078 | 446 | static int check_packed_git_idx(const char *path, struct packed_git *p) |
1f688557 JH |
447 | { |
448 | void *idx_map; | |
42873078 | 449 | struct pack_idx_header *hdr; |
dc49cd76 | 450 | size_t idx_size; |
74e34e1f | 451 | uint32_t version, nr, i, *index; |
e93ec6f9 | 452 | int fd = open(path, O_RDONLY); |
1f688557 | 453 | struct stat st; |
42873078 | 454 | |
1f688557 JH |
455 | if (fd < 0) |
456 | return -1; | |
457 | if (fstat(fd, &st)) { | |
458 | close(fd); | |
459 | return -1; | |
460 | } | |
dc49cd76 | 461 | idx_size = xsize_t(st.st_size); |
2d88451b SP |
462 | if (idx_size < 4 * 256 + 20 + 20) { |
463 | close(fd); | |
464 | return error("index file %s is too small", path); | |
465 | } | |
c4712e45 | 466 | idx_map = xmmap(NULL, idx_size, PROT_READ, MAP_PRIVATE, fd, 0); |
1f688557 | 467 | close(fd); |
1f688557 | 468 | |
42873078 NP |
469 | hdr = idx_map; |
470 | if (hdr->idx_signature == htonl(PACK_IDX_SIGNATURE)) { | |
74e34e1f NP |
471 | version = ntohl(hdr->idx_version); |
472 | if (version < 2 || version > 2) { | |
473 | munmap(idx_map, idx_size); | |
474 | return error("index file %s is version %d" | |
475 | " and is not supported by this binary" | |
476 | " (try upgrading GIT to a newer version)", | |
477 | path, version); | |
478 | } | |
479 | } else | |
480 | version = 1; | |
df1b059d | 481 | |
1f688557 | 482 | nr = 0; |
42873078 | 483 | index = idx_map; |
74e34e1f NP |
484 | if (version > 1) |
485 | index += 2; /* skip index header */ | |
1f688557 | 486 | for (i = 0; i < 256; i++) { |
326bf396 | 487 | uint32_t n = ntohl(index[i]); |
2d88451b SP |
488 | if (n < nr) { |
489 | munmap(idx_map, idx_size); | |
df1b059d | 490 | return error("non-monotonic index %s", path); |
2d88451b | 491 | } |
1f688557 JH |
492 | nr = n; |
493 | } | |
494 | ||
74e34e1f NP |
495 | if (version == 1) { |
496 | /* | |
497 | * Total size: | |
498 | * - 256 index entries 4 bytes each | |
499 | * - 24-byte entries * nr (20-byte sha1 + 4-byte offset) | |
500 | * - 20-byte SHA1 of the packfile | |
501 | * - 20-byte SHA1 file checksum | |
502 | */ | |
503 | if (idx_size != 4*256 + nr * 24 + 20 + 20) { | |
504 | munmap(idx_map, idx_size); | |
eef427a0 | 505 | return error("wrong index v1 file size in %s", path); |
74e34e1f NP |
506 | } |
507 | } else if (version == 2) { | |
508 | /* | |
509 | * Minimum size: | |
510 | * - 8 bytes of header | |
511 | * - 256 index entries 4 bytes each | |
512 | * - 20-byte sha1 entry * nr | |
513 | * - 4-byte crc entry * nr | |
514 | * - 4-byte offset entry * nr | |
515 | * - 20-byte SHA1 of the packfile | |
516 | * - 20-byte SHA1 file checksum | |
517 | * And after the 4-byte offset table might be a | |
518 | * variable sized table containing 8-byte entries | |
519 | * for offsets larger than 2^31. | |
520 | */ | |
521 | unsigned long min_size = 8 + 4*256 + nr*(20 + 4 + 4) + 20 + 20; | |
1164f1e4 LT |
522 | unsigned long max_size = min_size; |
523 | if (nr) | |
524 | max_size += (nr - 1)*8; | |
525 | if (idx_size < min_size || idx_size > max_size) { | |
74e34e1f | 526 | munmap(idx_map, idx_size); |
eef427a0 | 527 | return error("wrong index v2 file size in %s", path); |
74e34e1f | 528 | } |
7109c889 JH |
529 | if (idx_size != min_size && |
530 | /* | |
531 | * make sure we can deal with large pack offsets. | |
532 | * 31-bit signed offset won't be enough, neither | |
533 | * 32-bit unsigned one will be. | |
534 | */ | |
535 | (sizeof(off_t) <= 4)) { | |
536 | munmap(idx_map, idx_size); | |
537 | return error("pack too large for current definition of off_t in %s", path); | |
74e34e1f | 538 | } |
2d88451b | 539 | } |
1f688557 | 540 | |
74e34e1f | 541 | p->index_version = version; |
42873078 NP |
542 | p->index_data = idx_map; |
543 | p->index_size = idx_size; | |
57059091 | 544 | p->num_objects = nr; |
1f688557 JH |
545 | return 0; |
546 | } | |
547 | ||
bc8e478a | 548 | int open_pack_index(struct packed_git *p) |
d079837e SP |
549 | { |
550 | char *idx_name; | |
551 | int ret; | |
552 | ||
553 | if (p->index_data) | |
554 | return 0; | |
555 | ||
556 | idx_name = xstrdup(p->pack_name); | |
557 | strcpy(idx_name + strlen(idx_name) - strlen(".pack"), ".idx"); | |
558 | ret = check_packed_git_idx(idx_name, p); | |
559 | free(idx_name); | |
560 | return ret; | |
561 | } | |
562 | ||
11daf39b SP |
563 | static void scan_windows(struct packed_git *p, |
564 | struct packed_git **lru_p, | |
565 | struct pack_window **lru_w, | |
566 | struct pack_window **lru_l) | |
1f688557 | 567 | { |
11daf39b SP |
568 | struct pack_window *w, *w_l; |
569 | ||
570 | for (w_l = NULL, w = p->windows; w; w = w->next) { | |
571 | if (!w->inuse_cnt) { | |
572 | if (!*lru_w || w->last_used < (*lru_w)->last_used) { | |
573 | *lru_p = p; | |
574 | *lru_w = w; | |
575 | *lru_l = w_l; | |
54044bf8 | 576 | } |
54044bf8 | 577 | } |
11daf39b | 578 | w_l = w; |
f9253394 | 579 | } |
11daf39b SP |
580 | } |
581 | ||
d1efefa4 | 582 | static int unuse_one_window(struct packed_git *current, int keep_fd) |
11daf39b SP |
583 | { |
584 | struct packed_git *p, *lru_p = NULL; | |
585 | struct pack_window *lru_w = NULL, *lru_l = NULL; | |
586 | ||
587 | if (current) | |
588 | scan_windows(current, &lru_p, &lru_w, &lru_l); | |
589 | for (p = packed_git; p; p = p->next) | |
590 | scan_windows(p, &lru_p, &lru_w, &lru_l); | |
54044bf8 SP |
591 | if (lru_p) { |
592 | munmap(lru_w->base, lru_w->len); | |
593 | pack_mapped -= lru_w->len; | |
594 | if (lru_l) | |
595 | lru_l->next = lru_w->next; | |
596 | else { | |
597 | lru_p->windows = lru_w->next; | |
d1efefa4 | 598 | if (!lru_p->windows && lru_p->pack_fd != keep_fd) { |
54044bf8 SP |
599 | close(lru_p->pack_fd); |
600 | lru_p->pack_fd = -1; | |
601 | } | |
602 | } | |
603 | free(lru_w); | |
a53128b6 | 604 | pack_open_windows--; |
54044bf8 SP |
605 | return 1; |
606 | } | |
607 | return 0; | |
f9253394 JH |
608 | } |
609 | ||
d1efefa4 | 610 | void release_pack_memory(size_t need, int fd) |
97bfeb34 SP |
611 | { |
612 | size_t cur = pack_mapped; | |
d1efefa4 | 613 | while (need >= (cur - pack_mapped) && unuse_one_window(NULL, fd)) |
97bfeb34 SP |
614 | ; /* nothing */ |
615 | } | |
616 | ||
c9ced051 SP |
617 | void close_pack_windows(struct packed_git *p) |
618 | { | |
619 | while (p->windows) { | |
620 | struct pack_window *w = p->windows; | |
621 | ||
622 | if (w->inuse_cnt) | |
623 | die("pack '%s' still has open windows to it", | |
624 | p->pack_name); | |
625 | munmap(w->base, w->len); | |
626 | pack_mapped -= w->len; | |
627 | pack_open_windows--; | |
628 | p->windows = w->next; | |
629 | free(w); | |
630 | } | |
631 | } | |
632 | ||
03e79c88 | 633 | void unuse_pack(struct pack_window **w_cursor) |
f9253394 | 634 | { |
03e79c88 SP |
635 | struct pack_window *w = *w_cursor; |
636 | if (w) { | |
637 | w->inuse_cnt--; | |
638 | *w_cursor = NULL; | |
639 | } | |
1f688557 JH |
640 | } |
641 | ||
3cf8b462 SP |
642 | /* |
643 | * Do not call this directly as this leaks p->pack_fd on error return; | |
644 | * call open_packed_git() instead. | |
645 | */ | |
646 | static int open_packed_git_1(struct packed_git *p) | |
1f688557 | 647 | { |
9bc879c1 SP |
648 | struct stat st; |
649 | struct pack_header hdr; | |
650 | unsigned char sha1[20]; | |
651 | unsigned char *idx_sha1; | |
2c039da8 | 652 | long fd_flag; |
9bc879c1 | 653 | |
d079837e SP |
654 | if (!p->index_data && open_pack_index(p)) |
655 | return error("packfile %s index unavailable", p->pack_name); | |
656 | ||
9bc879c1 SP |
657 | p->pack_fd = open(p->pack_name, O_RDONLY); |
658 | if (p->pack_fd < 0 || fstat(p->pack_fd, &st)) | |
072db278 | 659 | return -1; |
9bc879c1 SP |
660 | |
661 | /* If we created the struct before we had the pack we lack size. */ | |
bf592c50 | 662 | if (!p->pack_size) { |
bf592c50 | 663 | if (!S_ISREG(st.st_mode)) |
072db278 | 664 | return error("packfile %s not a regular file", p->pack_name); |
bf592c50 | 665 | p->pack_size = st.st_size; |
9bc879c1 | 666 | } else if (p->pack_size != st.st_size) |
072db278 | 667 | return error("packfile %s size changed", p->pack_name); |
9bc879c1 | 668 | |
2c039da8 JH |
669 | /* We leave these file descriptors open with sliding mmap; |
670 | * there is no point keeping them open across exec(), though. | |
671 | */ | |
672 | fd_flag = fcntl(p->pack_fd, F_GETFD, 0); | |
673 | if (fd_flag < 0) | |
072db278 | 674 | return error("cannot determine file descriptor flags"); |
2c039da8 JH |
675 | fd_flag |= FD_CLOEXEC; |
676 | if (fcntl(p->pack_fd, F_SETFD, fd_flag) == -1) | |
072db278 | 677 | return error("cannot set FD_CLOEXEC"); |
2c039da8 | 678 | |
9bc879c1 | 679 | /* Verify we recognize this pack file format. */ |
e6e2bd62 | 680 | if (read_in_full(p->pack_fd, &hdr, sizeof(hdr)) != sizeof(hdr)) |
072db278 | 681 | return error("file %s is far too short to be a packfile", p->pack_name); |
9bc879c1 | 682 | if (hdr.hdr_signature != htonl(PACK_SIGNATURE)) |
072db278 | 683 | return error("file %s is not a GIT packfile", p->pack_name); |
9bc879c1 | 684 | if (!pack_version_ok(hdr.hdr_version)) |
072db278 | 685 | return error("packfile %s is version %u and not supported" |
9bc879c1 SP |
686 | " (try upgrading GIT to a newer version)", |
687 | p->pack_name, ntohl(hdr.hdr_version)); | |
688 | ||
689 | /* Verify the pack matches its index. */ | |
57059091 | 690 | if (p->num_objects != ntohl(hdr.hdr_entries)) |
072db278 | 691 | return error("packfile %s claims to have %u objects" |
57059091 NP |
692 | " while index indicates %u objects", |
693 | p->pack_name, ntohl(hdr.hdr_entries), | |
694 | p->num_objects); | |
9bc879c1 | 695 | if (lseek(p->pack_fd, p->pack_size - sizeof(sha1), SEEK_SET) == -1) |
072db278 | 696 | return error("end of packfile %s is unavailable", p->pack_name); |
e6e2bd62 | 697 | if (read_in_full(p->pack_fd, sha1, sizeof(sha1)) != sizeof(sha1)) |
072db278 | 698 | return error("packfile %s signature is unavailable", p->pack_name); |
42873078 | 699 | idx_sha1 = ((unsigned char *)p->index_data) + p->index_size - 40; |
9bc879c1 | 700 | if (hashcmp(sha1, idx_sha1)) |
072db278 SP |
701 | return error("packfile %s does not match index", p->pack_name); |
702 | return 0; | |
9bc879c1 SP |
703 | } |
704 | ||
3cf8b462 SP |
705 | static int open_packed_git(struct packed_git *p) |
706 | { | |
707 | if (!open_packed_git_1(p)) | |
708 | return 0; | |
709 | if (p->pack_fd != -1) { | |
710 | close(p->pack_fd); | |
711 | p->pack_fd = -1; | |
712 | } | |
713 | return -1; | |
714 | } | |
715 | ||
c4001d92 | 716 | static int in_window(struct pack_window *win, off_t offset) |
60bb8b14 SP |
717 | { |
718 | /* We must promise at least 20 bytes (one hash) after the | |
719 | * offset is available from this window, otherwise the offset | |
720 | * is not actually in this window and a different window (which | |
721 | * has that one hash excess) must be used. This is to support | |
722 | * the object header and delta base parsing routines below. | |
723 | */ | |
724 | off_t win_off = win->offset; | |
725 | return win_off <= offset | |
726 | && (offset + 20) <= (win_off + win->len); | |
727 | } | |
728 | ||
03e79c88 SP |
729 | unsigned char* use_pack(struct packed_git *p, |
730 | struct pack_window **w_cursor, | |
c4001d92 | 731 | off_t offset, |
03e79c88 | 732 | unsigned int *left) |
9bc879c1 | 733 | { |
60bb8b14 | 734 | struct pack_window *win = *w_cursor; |
03e79c88 | 735 | |
072db278 SP |
736 | if (p->pack_fd == -1 && open_packed_git(p)) |
737 | die("packfile %s cannot be accessed", p->pack_name); | |
60bb8b14 SP |
738 | |
739 | /* Since packfiles end in a hash of their content and its | |
740 | * pointless to ask for an offset into the middle of that | |
741 | * hash, and the in_window function above wouldn't match | |
742 | * don't allow an offset too close to the end of the file. | |
743 | */ | |
744 | if (offset > (p->pack_size - 20)) | |
745 | die("offset beyond end of packfile (truncated pack?)"); | |
746 | ||
747 | if (!win || !in_window(win, offset)) { | |
748 | if (win) | |
749 | win->inuse_cnt--; | |
750 | for (win = p->windows; win; win = win->next) { | |
751 | if (in_window(win, offset)) | |
752 | break; | |
753 | } | |
754 | if (!win) { | |
78a28df9 | 755 | size_t window_align = packed_git_window_size / 2; |
dc49cd76 | 756 | off_t len; |
60bb8b14 | 757 | win = xcalloc(1, sizeof(*win)); |
78a28df9 | 758 | win->offset = (offset / window_align) * window_align; |
dc49cd76 SP |
759 | len = p->pack_size - win->offset; |
760 | if (len > packed_git_window_size) | |
761 | len = packed_git_window_size; | |
762 | win->len = (size_t)len; | |
60bb8b14 | 763 | pack_mapped += win->len; |
11daf39b | 764 | while (packed_git_limit < pack_mapped |
d1efefa4 | 765 | && unuse_one_window(p, p->pack_fd)) |
60bb8b14 | 766 | ; /* nothing */ |
c4712e45 | 767 | win->base = xmmap(NULL, win->len, |
60bb8b14 SP |
768 | PROT_READ, MAP_PRIVATE, |
769 | p->pack_fd, win->offset); | |
770 | if (win->base == MAP_FAILED) | |
73b4e4be SP |
771 | die("packfile %s cannot be mapped: %s", |
772 | p->pack_name, | |
773 | strerror(errno)); | |
a53128b6 SP |
774 | pack_mmap_calls++; |
775 | pack_open_windows++; | |
776 | if (pack_mapped > peak_pack_mapped) | |
777 | peak_pack_mapped = pack_mapped; | |
778 | if (pack_open_windows > peak_pack_open_windows) | |
779 | peak_pack_open_windows = pack_open_windows; | |
60bb8b14 SP |
780 | win->next = p->windows; |
781 | p->windows = win; | |
782 | } | |
1f688557 | 783 | } |
03e79c88 SP |
784 | if (win != *w_cursor) { |
785 | win->last_used = pack_used_ctr++; | |
786 | win->inuse_cnt++; | |
787 | *w_cursor = win; | |
788 | } | |
60bb8b14 | 789 | offset -= win->offset; |
03e79c88 | 790 | if (left) |
dc49cd76 | 791 | *left = win->len - xsize_t(offset); |
03e79c88 | 792 | return win->base + offset; |
1f688557 JH |
793 | } |
794 | ||
42873078 | 795 | struct packed_git *add_packed_git(const char *path, int path_len, int local) |
1f688557 JH |
796 | { |
797 | struct stat st; | |
42873078 | 798 | struct packed_git *p = xmalloc(sizeof(*p) + path_len + 2); |
1f688557 | 799 | |
42873078 NP |
800 | /* |
801 | * Make sure a corresponding .pack file exists and that | |
802 | * the index looks sane. | |
803 | */ | |
804 | path_len -= strlen(".idx"); | |
805 | if (path_len < 1) | |
1f688557 | 806 | return NULL; |
42873078 NP |
807 | memcpy(p->pack_name, path, path_len); |
808 | strcpy(p->pack_name + path_len, ".pack"); | |
d079837e | 809 | if (stat(p->pack_name, &st) || !S_ISREG(st.st_mode)) { |
42873078 | 810 | free(p); |
1f688557 JH |
811 | return NULL; |
812 | } | |
42873078 | 813 | |
1f688557 JH |
814 | /* ok, it looks sane as far as we can check without |
815 | * actually mapping the pack file. | |
816 | */ | |
d079837e SP |
817 | p->index_version = 0; |
818 | p->index_data = NULL; | |
819 | p->index_size = 0; | |
820 | p->num_objects = 0; | |
1f688557 | 821 | p->pack_size = st.st_size; |
1f688557 | 822 | p->next = NULL; |
c41ee586 | 823 | p->windows = NULL; |
9bc879c1 | 824 | p->pack_fd = -1; |
9d835df2 | 825 | p->pack_local = local; |
b867092f | 826 | p->mtime = st.st_mtime; |
42873078 NP |
827 | if (path_len < 40 || get_sha1_hex(path + path_len - 40, p->sha1)) |
828 | hashclr(p->sha1); | |
1f688557 JH |
829 | return p; |
830 | } | |
831 | ||
bf592c50 | 832 | struct packed_git *parse_pack_index(unsigned char *sha1) |
c508df5e | 833 | { |
79c6dca4 | 834 | const char *idx_path = sha1_pack_index_name(sha1); |
42873078 NP |
835 | const char *path = sha1_pack_name(sha1); |
836 | struct packed_git *p = xmalloc(sizeof(*p) + strlen(path) + 2); | |
bf592c50 | 837 | |
42873078 NP |
838 | if (check_packed_git_idx(idx_path, p)) { |
839 | free(p); | |
bf592c50 | 840 | return NULL; |
42873078 | 841 | } |
bf592c50 | 842 | |
bf592c50 | 843 | strcpy(p->pack_name, path); |
bf592c50 | 844 | p->pack_size = 0; |
bf592c50 | 845 | p->next = NULL; |
c41ee586 | 846 | p->windows = NULL; |
9bc879c1 | 847 | p->pack_fd = -1; |
e702496e | 848 | hashcpy(p->sha1, sha1); |
bf592c50 DB |
849 | return p; |
850 | } | |
851 | ||
852 | void install_packed_git(struct packed_git *pack) | |
853 | { | |
854 | pack->next = packed_git; | |
855 | packed_git = pack; | |
856 | } | |
857 | ||
9d835df2 | 858 | static void prepare_packed_git_one(char *objdir, int local) |
1f688557 | 859 | { |
9cb18f56 JM |
860 | /* Ensure that this buffer is large enough so that we can |
861 | append "/pack/" without clobbering the stack even if | |
862 | strlen(objdir) were PATH_MAX. */ | |
863 | char path[PATH_MAX + 1 + 4 + 1 + 1]; | |
1f688557 JH |
864 | int len; |
865 | DIR *dir; | |
866 | struct dirent *de; | |
867 | ||
868 | sprintf(path, "%s/pack", objdir); | |
869 | len = strlen(path); | |
870 | dir = opendir(path); | |
b5b16990 | 871 | if (!dir) { |
26125f6b | 872 | if (errno != ENOENT) |
bd2afde8 | 873 | error("unable to open object pack directory: %s: %s", |
26125f6b | 874 | path, strerror(errno)); |
1f688557 | 875 | return; |
b5b16990 | 876 | } |
1f688557 JH |
877 | path[len++] = '/'; |
878 | while ((de = readdir(dir)) != NULL) { | |
879 | int namelen = strlen(de->d_name); | |
880 | struct packed_git *p; | |
881 | ||
5bb1cda5 | 882 | if (!has_extension(de->d_name, ".idx")) |
1f688557 JH |
883 | continue; |
884 | ||
9cb18f56 JM |
885 | if (len + namelen + 1 > sizeof(path)) |
886 | continue; | |
887 | ||
54a15a8d | 888 | /* Don't reopen a pack we already have. */ |
1f688557 | 889 | strcpy(path + len, de->d_name); |
86f7780c JK |
890 | for (p = packed_git; p; p = p->next) { |
891 | if (!memcmp(path, p->pack_name, len + namelen - 4)) | |
892 | break; | |
893 | } | |
894 | if (p) | |
895 | continue; | |
54a15a8d SP |
896 | /* See if it really is a valid .idx file with corresponding |
897 | * .pack file that we can map. | |
898 | */ | |
9d835df2 | 899 | p = add_packed_git(path, len + namelen, local); |
1f688557 JH |
900 | if (!p) |
901 | continue; | |
625e9421 | 902 | install_packed_git(p); |
1f688557 | 903 | } |
5b35bcd5 | 904 | closedir(dir); |
1f688557 JH |
905 | } |
906 | ||
b867092f JH |
907 | static int sort_pack(const void *a_, const void *b_) |
908 | { | |
909 | struct packed_git *a = *((struct packed_git **)a_); | |
910 | struct packed_git *b = *((struct packed_git **)b_); | |
911 | int st; | |
912 | ||
913 | /* | |
914 | * Local packs tend to contain objects specific to our | |
915 | * variant of the project than remote ones. In addition, | |
916 | * remote ones could be on a network mounted filesystem. | |
917 | * Favor local ones for these reasons. | |
918 | */ | |
919 | st = a->pack_local - b->pack_local; | |
920 | if (st) | |
921 | return -st; | |
922 | ||
923 | /* | |
924 | * Younger packs tend to contain more recent objects, | |
925 | * and more recent objects tend to get accessed more | |
926 | * often. | |
927 | */ | |
928 | if (a->mtime < b->mtime) | |
929 | return 1; | |
930 | else if (a->mtime == b->mtime) | |
931 | return 0; | |
932 | return -1; | |
933 | } | |
934 | ||
935 | static void rearrange_packed_git(void) | |
936 | { | |
937 | struct packed_git **ary, *p; | |
938 | int i, n; | |
939 | ||
940 | for (n = 0, p = packed_git; p; p = p->next) | |
941 | n++; | |
942 | if (n < 2) | |
943 | return; | |
944 | ||
945 | /* prepare an array of packed_git for easier sorting */ | |
946 | ary = xcalloc(n, sizeof(struct packed_git *)); | |
947 | for (n = 0, p = packed_git; p; p = p->next) | |
948 | ary[n++] = p; | |
949 | ||
950 | qsort(ary, n, sizeof(struct packed_git *), sort_pack); | |
951 | ||
952 | /* link them back again */ | |
953 | for (i = 0; i < n - 1; i++) | |
954 | ary[i]->next = ary[i + 1]; | |
955 | ary[n - 1]->next = NULL; | |
956 | packed_git = ary[0]; | |
957 | ||
958 | free(ary); | |
959 | } | |
960 | ||
637cdd9d | 961 | static int prepare_packed_git_run_once = 0; |
9a217f2a | 962 | void prepare_packed_git(void) |
1f688557 | 963 | { |
d5a63b99 | 964 | struct alternate_object_database *alt; |
1f688557 | 965 | |
637cdd9d | 966 | if (prepare_packed_git_run_once) |
1f688557 | 967 | return; |
9d835df2 | 968 | prepare_packed_git_one(get_object_directory(), 1); |
9a217f2a | 969 | prepare_alt_odb(); |
d5a63b99 | 970 | for (alt = alt_odb_list; alt; alt = alt->next) { |
1494e038 | 971 | alt->name[-1] = 0; |
9d835df2 | 972 | prepare_packed_git_one(alt->base, 0); |
1494e038 | 973 | alt->name[-1] = '/'; |
1f688557 | 974 | } |
b867092f | 975 | rearrange_packed_git(); |
637cdd9d JK |
976 | prepare_packed_git_run_once = 1; |
977 | } | |
978 | ||
fc04c412 | 979 | void reprepare_packed_git(void) |
637cdd9d JK |
980 | { |
981 | prepare_packed_git_run_once = 0; | |
982 | prepare_packed_git(); | |
1f688557 JH |
983 | } |
984 | ||
5d6ccf5c | 985 | int check_sha1_signature(const unsigned char *sha1, void *map, unsigned long size, const char *type) |
0fcfd160 LT |
986 | { |
987 | unsigned char real_sha1[20]; | |
7cfb5f36 | 988 | hash_sha1_file(map, size, type, real_sha1); |
a89fccd2 | 989 | return hashcmp(sha1, real_sha1) ? -1 : 0; |
0fcfd160 LT |
990 | } |
991 | ||
44d1c19e LT |
992 | static int git_open_noatime(const char *name) |
993 | { | |
994 | static int sha1_file_open_flag = O_NOATIME; | |
995 | int fd = open(name, O_RDONLY | sha1_file_open_flag); | |
996 | ||
997 | /* Might the failure be due to O_NOATIME? */ | |
998 | if (fd < 0 && errno != ENOENT && sha1_file_open_flag) { | |
999 | fd = open(name, O_RDONLY); | |
1000 | if (fd >= 0) | |
1001 | sha1_file_open_flag = 0; | |
1002 | } | |
1003 | return fd; | |
1004 | } | |
1005 | ||
1006 | static int open_sha1_file(const unsigned char *sha1) | |
1007 | { | |
1008 | int fd; | |
1009 | char *name = sha1_file_name(sha1); | |
1010 | struct alternate_object_database *alt; | |
1011 | ||
1012 | fd = git_open_noatime(name); | |
1013 | if (fd >= 0) | |
1014 | return fd; | |
1015 | ||
1016 | prepare_alt_odb(); | |
1017 | errno = ENOENT; | |
1018 | for (alt = alt_odb_list; alt; alt = alt->next) { | |
1019 | name = alt->name; | |
1020 | fill_sha1_path(name, sha1); | |
1021 | fd = git_open_noatime(alt->base); | |
1022 | if (fd >= 0) | |
1023 | return fd; | |
1024 | } | |
1025 | return -1; | |
1026 | } | |
1027 | ||
4175e9e3 | 1028 | static void *map_sha1_file(const unsigned char *sha1, unsigned long *size) |
0fcfd160 | 1029 | { |
0fcfd160 | 1030 | void *map; |
144bde78 | 1031 | int fd; |
ace1534d | 1032 | |
44d1c19e LT |
1033 | fd = open_sha1_file(sha1); |
1034 | map = NULL; | |
1035 | if (fd >= 0) { | |
1036 | struct stat st; | |
0fcfd160 | 1037 | |
44d1c19e LT |
1038 | if (!fstat(fd, &st)) { |
1039 | *size = xsize_t(st.st_size); | |
1040 | map = xmmap(NULL, *size, PROT_READ, MAP_PRIVATE, fd, 0); | |
144bde78 | 1041 | } |
44d1c19e | 1042 | close(fd); |
0fcfd160 | 1043 | } |
0fcfd160 LT |
1044 | return map; |
1045 | } | |
1046 | ||
726f852b | 1047 | static int legacy_loose_object(unsigned char *map) |
bb6b8e4f JH |
1048 | { |
1049 | unsigned int word; | |
1050 | ||
1051 | /* | |
1052 | * Is it a zlib-compressed buffer? If so, the first byte | |
1053 | * must be 0x78 (15-bit window size, deflated), and the | |
1054 | * first 16-bit word is evenly divisible by 31 | |
1055 | */ | |
1056 | word = (map[0] << 8) + map[1]; | |
1057 | if (map[0] == 0x78 && !(word % 31)) | |
1058 | return 1; | |
1059 | else | |
1060 | return 0; | |
1061 | } | |
1062 | ||
72518e9c | 1063 | unsigned long unpack_object_header_gently(const unsigned char *buf, unsigned long len, enum object_type *type, unsigned long *sizep) |
c4483576 | 1064 | { |
ad1ed5ee | 1065 | unsigned shift; |
93821bd9 | 1066 | unsigned char c; |
93821bd9 | 1067 | unsigned long size; |
ad1ed5ee JH |
1068 | unsigned long used = 0; |
1069 | ||
1070 | c = buf[used++]; | |
1071 | *type = (c >> 4) & 7; | |
1072 | size = c & 15; | |
1073 | shift = 4; | |
1074 | while (c & 0x80) { | |
1075 | if (len <= used) | |
1076 | return 0; | |
1077 | if (sizeof(long) * 8 <= shift) | |
1078 | return 0; | |
1079 | c = buf[used++]; | |
1080 | size += (c & 0x7f) << shift; | |
1081 | shift += 7; | |
1082 | } | |
1083 | *sizep = size; | |
1084 | return used; | |
1085 | } | |
1086 | ||
1087 | static int unpack_sha1_header(z_stream *stream, unsigned char *map, unsigned long mapsize, void *buffer, unsigned long bufsiz) | |
1088 | { | |
1089 | unsigned long size, used; | |
1090 | static const char valid_loose_object_type[8] = { | |
1091 | 0, /* OBJ_EXT */ | |
1092 | 1, 1, 1, 1, /* "commit", "tree", "blob", "tag" */ | |
1093 | 0, /* "delta" and others are invalid in a loose object */ | |
93821bd9 | 1094 | }; |
ad1ed5ee | 1095 | enum object_type type; |
93821bd9 | 1096 | |
c4483576 LT |
1097 | /* Get the data stream */ |
1098 | memset(stream, 0, sizeof(*stream)); | |
1099 | stream->next_in = map; | |
1100 | stream->avail_in = mapsize; | |
1101 | stream->next_out = buffer; | |
93821bd9 LT |
1102 | stream->avail_out = bufsiz; |
1103 | ||
bb6b8e4f | 1104 | if (legacy_loose_object(map)) { |
93821bd9 LT |
1105 | inflateInit(stream); |
1106 | return inflate(stream, 0); | |
1107 | } | |
1108 | ||
726f852b NP |
1109 | |
1110 | /* | |
1111 | * There used to be a second loose object header format which | |
1112 | * was meant to mimic the in-pack format, allowing for direct | |
1113 | * copy of the object data. This format turned up not to be | |
1114 | * really worth it and we don't write it any longer. But we | |
1115 | * can still read it. | |
1116 | */ | |
ad1ed5ee JH |
1117 | used = unpack_object_header_gently(map, mapsize, &type, &size); |
1118 | if (!used || !valid_loose_object_type[type]) | |
93821bd9 | 1119 | return -1; |
ad1ed5ee JH |
1120 | map += used; |
1121 | mapsize -= used; | |
93821bd9 LT |
1122 | |
1123 | /* Set up the stream for the rest.. */ | |
1124 | stream->next_in = map; | |
1125 | stream->avail_in = mapsize; | |
c4483576 | 1126 | inflateInit(stream); |
93821bd9 LT |
1127 | |
1128 | /* And generate the fake traditional header */ | |
ad1ed5ee | 1129 | stream->total_out = 1 + snprintf(buffer, bufsiz, "%s %lu", |
df843662 | 1130 | typename(type), size); |
93821bd9 | 1131 | return 0; |
c4483576 LT |
1132 | } |
1133 | ||
7efbff75 | 1134 | static void *unpack_sha1_rest(z_stream *stream, void *buffer, unsigned long size, const unsigned char *sha1) |
5180cacc LT |
1135 | { |
1136 | int bytes = strlen(buffer) + 1; | |
d565b341 | 1137 | unsigned char *buf = xmalloc(1+size); |
93821bd9 | 1138 | unsigned long n; |
7efbff75 | 1139 | int status = Z_OK; |
5180cacc | 1140 | |
93821bd9 LT |
1141 | n = stream->total_out - bytes; |
1142 | if (n > size) | |
1143 | n = size; | |
1144 | memcpy(buf, (char *) buffer + bytes, n); | |
1145 | bytes = n; | |
456cdf6e LT |
1146 | if (bytes <= size) { |
1147 | /* | |
1148 | * The above condition must be (bytes <= size), not | |
1149 | * (bytes < size). In other words, even though we | |
1150 | * expect no more output and set avail_out to zer0, | |
1151 | * the input zlib stream may have bytes that express | |
1152 | * "this concludes the stream", and we *do* want to | |
1153 | * eat that input. | |
1154 | * | |
1155 | * Otherwise we would not be able to test that we | |
1156 | * consumed all the input to reach the expected size; | |
1157 | * we also want to check that zlib tells us that all | |
1158 | * went well with status == Z_STREAM_END at the end. | |
1159 | */ | |
5180cacc LT |
1160 | stream->next_out = buf + bytes; |
1161 | stream->avail_out = size - bytes; | |
7efbff75 JH |
1162 | while (status == Z_OK) |
1163 | status = inflate(stream, Z_FINISH); | |
5180cacc LT |
1164 | } |
1165 | buf[size] = 0; | |
456cdf6e | 1166 | if (status == Z_STREAM_END && !stream->avail_in) { |
7efbff75 JH |
1167 | inflateEnd(stream); |
1168 | return buf; | |
1169 | } | |
1170 | ||
1171 | if (status < 0) | |
1172 | error("corrupt loose object '%s'", sha1_to_hex(sha1)); | |
1173 | else if (stream->avail_in) | |
1174 | error("garbage at end of loose object '%s'", | |
1175 | sha1_to_hex(sha1)); | |
1176 | free(buf); | |
1177 | return NULL; | |
5180cacc LT |
1178 | } |
1179 | ||
1180 | /* | |
1181 | * We used to just use "sscanf()", but that's actually way | |
1182 | * too permissive for what we want to check. So do an anal | |
1183 | * object header parse by hand. | |
1184 | */ | |
21666f1a | 1185 | static int parse_sha1_header(const char *hdr, unsigned long *sizep) |
5180cacc | 1186 | { |
21666f1a | 1187 | char type[10]; |
5180cacc LT |
1188 | int i; |
1189 | unsigned long size; | |
1190 | ||
1191 | /* | |
a6080a0a | 1192 | * The type can be at most ten bytes (including the |
5180cacc | 1193 | * terminating '\0' that we add), and is followed by |
21666f1a | 1194 | * a space. |
5180cacc | 1195 | */ |
21666f1a | 1196 | i = 0; |
5180cacc LT |
1197 | for (;;) { |
1198 | char c = *hdr++; | |
1199 | if (c == ' ') | |
1200 | break; | |
21666f1a NP |
1201 | type[i++] = c; |
1202 | if (i >= sizeof(type)) | |
5180cacc | 1203 | return -1; |
5180cacc | 1204 | } |
21666f1a | 1205 | type[i] = 0; |
5180cacc LT |
1206 | |
1207 | /* | |
1208 | * The length must follow immediately, and be in canonical | |
1209 | * decimal format (ie "010" is not valid). | |
1210 | */ | |
1211 | size = *hdr++ - '0'; | |
1212 | if (size > 9) | |
1213 | return -1; | |
1214 | if (size) { | |
1215 | for (;;) { | |
1216 | unsigned long c = *hdr - '0'; | |
1217 | if (c > 9) | |
1218 | break; | |
1219 | hdr++; | |
1220 | size = size * 10 + c; | |
1221 | } | |
1222 | } | |
1223 | *sizep = size; | |
1224 | ||
1225 | /* | |
1226 | * The length must be followed by a zero byte | |
1227 | */ | |
21666f1a | 1228 | return *hdr ? -1 : type_from_string(type); |
5180cacc LT |
1229 | } |
1230 | ||
7efbff75 | 1231 | static void *unpack_sha1_file(void *map, unsigned long mapsize, enum object_type *type, unsigned long *size, const unsigned char *sha1) |
0fcfd160 | 1232 | { |
5180cacc | 1233 | int ret; |
0fcfd160 | 1234 | z_stream stream; |
5180cacc | 1235 | char hdr[8192]; |
0fcfd160 | 1236 | |
5180cacc | 1237 | ret = unpack_sha1_header(&stream, map, mapsize, hdr, sizeof(hdr)); |
21666f1a | 1238 | if (ret < Z_OK || (*type = parse_sha1_header(hdr, size)) < 0) |
0fcfd160 LT |
1239 | return NULL; |
1240 | ||
7efbff75 | 1241 | return unpack_sha1_rest(&stream, hdr, *size, sha1); |
0fcfd160 LT |
1242 | } |
1243 | ||
54dab52a NP |
1244 | unsigned long get_size_from_delta(struct packed_git *p, |
1245 | struct pack_window **w_curs, | |
1246 | off_t curpos) | |
1247 | { | |
1248 | const unsigned char *data; | |
1249 | unsigned char delta_head[20], *in; | |
1250 | z_stream stream; | |
1251 | int st; | |
1252 | ||
1253 | memset(&stream, 0, sizeof(stream)); | |
1254 | stream.next_out = delta_head; | |
1255 | stream.avail_out = sizeof(delta_head); | |
1256 | ||
1257 | inflateInit(&stream); | |
1258 | do { | |
1259 | in = use_pack(p, w_curs, curpos, &stream.avail_in); | |
1260 | stream.next_in = in; | |
1261 | st = inflate(&stream, Z_FINISH); | |
1262 | curpos += stream.next_in - in; | |
1263 | } while ((st == Z_OK || st == Z_BUF_ERROR) && | |
1264 | stream.total_out < sizeof(delta_head)); | |
1265 | inflateEnd(&stream); | |
1266 | if ((st != Z_STREAM_END) && stream.total_out != sizeof(delta_head)) | |
1267 | die("delta data unpack-initial failed"); | |
1268 | ||
1269 | /* Examine the initial part of the delta to figure out | |
1270 | * the result size. | |
1271 | */ | |
1272 | data = delta_head; | |
1273 | ||
1274 | /* ignore base size */ | |
1275 | get_delta_hdr_size(&data, delta_head+sizeof(delta_head)); | |
1276 | ||
1277 | /* Read the result size */ | |
1278 | return get_delta_hdr_size(&data, delta_head+sizeof(delta_head)); | |
1279 | } | |
1280 | ||
c4001d92 | 1281 | static off_t get_delta_base(struct packed_git *p, |
03e79c88 | 1282 | struct pack_window **w_curs, |
c4001d92 | 1283 | off_t *curpos, |
21666f1a | 1284 | enum object_type type, |
c4001d92 | 1285 | off_t delta_obj_offset) |
eb32d236 | 1286 | { |
2b87c45b | 1287 | unsigned char *base_info = use_pack(p, w_curs, *curpos, NULL); |
c4001d92 | 1288 | off_t base_offset; |
eb32d236 | 1289 | |
8d8a4ea5 SP |
1290 | /* use_pack() assured us we have [base_info, base_info + 20) |
1291 | * as a range that we can look at without walking off the | |
1292 | * end of the mapped window. Its actually the hash size | |
1293 | * that is assured. An OFS_DELTA longer than the hash size | |
1294 | * is stupid, as then a REF_DELTA would be smaller to store. | |
1295 | */ | |
21666f1a | 1296 | if (type == OBJ_OFS_DELTA) { |
eb32d236 NP |
1297 | unsigned used = 0; |
1298 | unsigned char c = base_info[used++]; | |
1299 | base_offset = c & 127; | |
1300 | while (c & 128) { | |
1301 | base_offset += 1; | |
8723f216 | 1302 | if (!base_offset || MSB(base_offset, 7)) |
eb32d236 NP |
1303 | die("offset value overflow for delta base object"); |
1304 | c = base_info[used++]; | |
1305 | base_offset = (base_offset << 7) + (c & 127); | |
1306 | } | |
1307 | base_offset = delta_obj_offset - base_offset; | |
1308 | if (base_offset >= delta_obj_offset) | |
1309 | die("delta base offset out of bound"); | |
2b87c45b | 1310 | *curpos += used; |
21666f1a | 1311 | } else if (type == OBJ_REF_DELTA) { |
eb32d236 NP |
1312 | /* The base entry _must_ be in the same pack */ |
1313 | base_offset = find_pack_entry_one(base_info, p); | |
1314 | if (!base_offset) | |
1315 | die("failed to find delta-pack base object %s", | |
1316 | sha1_to_hex(base_info)); | |
2b87c45b | 1317 | *curpos += 20; |
eb32d236 NP |
1318 | } else |
1319 | die("I am totally screwed"); | |
2b87c45b | 1320 | return base_offset; |
eb32d236 NP |
1321 | } |
1322 | ||
f3bf9224 | 1323 | /* forward declaration for a mutually recursive function */ |
c4001d92 | 1324 | static int packed_object_info(struct packed_git *p, off_t offset, |
21666f1a | 1325 | unsigned long *sizep); |
f3bf9224 | 1326 | |
43057304 | 1327 | static int packed_delta_info(struct packed_git *p, |
03e79c88 | 1328 | struct pack_window **w_curs, |
c4001d92 | 1329 | off_t curpos, |
21666f1a | 1330 | enum object_type type, |
c4001d92 | 1331 | off_t obj_offset, |
43057304 | 1332 | unsigned long *sizep) |
5db47c2b | 1333 | { |
c4001d92 | 1334 | off_t base_offset; |
f3bf9224 | 1335 | |
21666f1a NP |
1336 | base_offset = get_delta_base(p, w_curs, &curpos, type, obj_offset); |
1337 | type = packed_object_info(p, base_offset, NULL); | |
f3bf9224 | 1338 | |
c62266f3 JH |
1339 | /* We choose to only get the type of the base object and |
1340 | * ignore potentially corrupt pack file that expects the delta | |
1341 | * based on a base with a wrong size. This saves tons of | |
1342 | * inflate() calls. | |
1343 | */ | |
54dab52a NP |
1344 | if (sizep) |
1345 | *sizep = get_size_from_delta(p, w_curs, curpos); | |
21666f1a NP |
1346 | |
1347 | return type; | |
5db47c2b JH |
1348 | } |
1349 | ||
2b87c45b NP |
1350 | static int unpack_object_header(struct packed_git *p, |
1351 | struct pack_window **w_curs, | |
c4001d92 | 1352 | off_t *curpos, |
2b87c45b | 1353 | unsigned long *sizep) |
a733cb60 | 1354 | { |
03e79c88 SP |
1355 | unsigned char *base; |
1356 | unsigned int left; | |
ad1ed5ee | 1357 | unsigned long used; |
2b87c45b | 1358 | enum object_type type; |
a733cb60 | 1359 | |
8d8a4ea5 SP |
1360 | /* use_pack() assures us we have [base, base + 20) available |
1361 | * as a range that we can look at at. (Its actually the hash | |
3dff5379 | 1362 | * size that is assured.) With our object header encoding |
8d8a4ea5 SP |
1363 | * the maximum deflated object size is 2^137, which is just |
1364 | * insane, so we know won't exceed what we have been given. | |
1365 | */ | |
2b87c45b NP |
1366 | base = use_pack(p, w_curs, *curpos, &left); |
1367 | used = unpack_object_header_gently(base, left, &type, sizep); | |
ad1ed5ee JH |
1368 | if (!used) |
1369 | die("object offset outside of pack file"); | |
2b87c45b | 1370 | *curpos += used; |
ad1ed5ee | 1371 | |
2b87c45b | 1372 | return type; |
a733cb60 LT |
1373 | } |
1374 | ||
21666f1a | 1375 | const char *packed_object_info_detail(struct packed_git *p, |
c4001d92 | 1376 | off_t obj_offset, |
21666f1a NP |
1377 | unsigned long *size, |
1378 | unsigned long *store_size, | |
1379 | unsigned int *delta_chain_length, | |
1380 | unsigned char *base_sha1) | |
ad8c80a5 | 1381 | { |
03e79c88 | 1382 | struct pack_window *w_curs = NULL; |
c4001d92 SP |
1383 | off_t curpos; |
1384 | unsigned long dummy; | |
43057304 | 1385 | unsigned char *next_sha1; |
21666f1a | 1386 | enum object_type type; |
70f5d5d3 | 1387 | struct revindex_entry *revidx; |
ad8c80a5 | 1388 | |
43057304 | 1389 | *delta_chain_length = 0; |
2b87c45b | 1390 | curpos = obj_offset; |
21666f1a | 1391 | type = unpack_object_header(p, &w_curs, &curpos, size); |
43057304 | 1392 | |
70f5d5d3 NP |
1393 | revidx = find_pack_revindex(p, obj_offset); |
1394 | *store_size = revidx[1].offset - obj_offset; | |
1395 | ||
43057304 | 1396 | for (;;) { |
21666f1a | 1397 | switch (type) { |
43057304 | 1398 | default: |
08a19d87 | 1399 | die("pack %s contains unknown object type %d", |
21666f1a | 1400 | p->pack_name, type); |
43057304 NP |
1401 | case OBJ_COMMIT: |
1402 | case OBJ_TREE: | |
1403 | case OBJ_BLOB: | |
1404 | case OBJ_TAG: | |
03e79c88 | 1405 | unuse_pack(&w_curs); |
21666f1a | 1406 | return typename(type); |
eb32d236 | 1407 | case OBJ_OFS_DELTA: |
21666f1a | 1408 | obj_offset = get_delta_base(p, &w_curs, &curpos, type, obj_offset); |
eb32d236 | 1409 | if (*delta_chain_length == 0) { |
70f5d5d3 NP |
1410 | revidx = find_pack_revindex(p, obj_offset); |
1411 | hashcpy(base_sha1, nth_packed_object_sha1(p, revidx->nr)); | |
eb32d236 NP |
1412 | } |
1413 | break; | |
1414 | case OBJ_REF_DELTA: | |
2b87c45b | 1415 | next_sha1 = use_pack(p, &w_curs, curpos, NULL); |
43057304 NP |
1416 | if (*delta_chain_length == 0) |
1417 | hashcpy(base_sha1, next_sha1); | |
2b87c45b | 1418 | obj_offset = find_pack_entry_one(next_sha1, p); |
43057304 NP |
1419 | break; |
1420 | } | |
43057304 | 1421 | (*delta_chain_length)++; |
2b87c45b | 1422 | curpos = obj_offset; |
21666f1a | 1423 | type = unpack_object_header(p, &w_curs, &curpos, &dummy); |
ad8c80a5 | 1424 | } |
ad8c80a5 JH |
1425 | } |
1426 | ||
c4001d92 | 1427 | static int packed_object_info(struct packed_git *p, off_t obj_offset, |
21666f1a | 1428 | unsigned long *sizep) |
1f688557 | 1429 | { |
03e79c88 | 1430 | struct pack_window *w_curs = NULL; |
c4001d92 SP |
1431 | unsigned long size; |
1432 | off_t curpos = obj_offset; | |
21666f1a | 1433 | enum object_type type; |
5db47c2b | 1434 | |
21666f1a | 1435 | type = unpack_object_header(p, &w_curs, &curpos, &size); |
5db47c2b | 1436 | |
21666f1a | 1437 | switch (type) { |
eb32d236 NP |
1438 | case OBJ_OFS_DELTA: |
1439 | case OBJ_REF_DELTA: | |
21666f1a NP |
1440 | type = packed_delta_info(p, &w_curs, curpos, |
1441 | type, obj_offset, sizep); | |
2b87c45b | 1442 | break; |
a733cb60 | 1443 | case OBJ_COMMIT: |
a733cb60 | 1444 | case OBJ_TREE: |
a733cb60 | 1445 | case OBJ_BLOB: |
a733cb60 | 1446 | case OBJ_TAG: |
2b87c45b NP |
1447 | if (sizep) |
1448 | *sizep = size; | |
a69d0943 | 1449 | break; |
1f688557 | 1450 | default: |
08a19d87 | 1451 | die("pack %s contains unknown object type %d", |
21666f1a | 1452 | p->pack_name, type); |
1f688557 | 1453 | } |
2b87c45b | 1454 | unuse_pack(&w_curs); |
21666f1a | 1455 | return type; |
1f688557 JH |
1456 | } |
1457 | ||
eb950c19 | 1458 | static void *unpack_compressed_entry(struct packed_git *p, |
03e79c88 | 1459 | struct pack_window **w_curs, |
c4001d92 | 1460 | off_t curpos, |
eb950c19 | 1461 | unsigned long size) |
de530aaa SP |
1462 | { |
1463 | int st; | |
1464 | z_stream stream; | |
079afb18 | 1465 | unsigned char *buffer, *in; |
de530aaa SP |
1466 | |
1467 | buffer = xmalloc(size + 1); | |
1468 | buffer[size] = 0; | |
1469 | memset(&stream, 0, sizeof(stream)); | |
de530aaa SP |
1470 | stream.next_out = buffer; |
1471 | stream.avail_out = size; | |
1472 | ||
1473 | inflateInit(&stream); | |
079afb18 | 1474 | do { |
2b87c45b | 1475 | in = use_pack(p, w_curs, curpos, &stream.avail_in); |
079afb18 SP |
1476 | stream.next_in = in; |
1477 | st = inflate(&stream, Z_FINISH); | |
2b87c45b | 1478 | curpos += stream.next_in - in; |
079afb18 | 1479 | } while (st == Z_OK || st == Z_BUF_ERROR); |
de530aaa SP |
1480 | inflateEnd(&stream); |
1481 | if ((st != Z_STREAM_END) || stream.total_out != size) { | |
1482 | free(buffer); | |
1483 | return NULL; | |
1484 | } | |
1485 | ||
1486 | return buffer; | |
1487 | } | |
1488 | ||
e5e01619 LT |
1489 | #define MAX_DELTA_CACHE (256) |
1490 | ||
18bdec11 | 1491 | static size_t delta_base_cached; |
5e08ecbf NP |
1492 | |
1493 | static struct delta_base_cache_lru_list { | |
1494 | struct delta_base_cache_lru_list *prev; | |
1495 | struct delta_base_cache_lru_list *next; | |
1496 | } delta_base_cache_lru = { &delta_base_cache_lru, &delta_base_cache_lru }; | |
1497 | ||
e5e01619 | 1498 | static struct delta_base_cache_entry { |
5e08ecbf NP |
1499 | struct delta_base_cache_lru_list lru; |
1500 | void *data; | |
e5e01619 LT |
1501 | struct packed_git *p; |
1502 | off_t base_offset; | |
1503 | unsigned long size; | |
e5e01619 LT |
1504 | enum object_type type; |
1505 | } delta_base_cache[MAX_DELTA_CACHE]; | |
1506 | ||
1507 | static unsigned long pack_entry_hash(struct packed_git *p, off_t base_offset) | |
1508 | { | |
1509 | unsigned long hash; | |
1510 | ||
1511 | hash = (unsigned long)p + (unsigned long)base_offset; | |
1512 | hash += (hash >> 8) + (hash >> 16); | |
3358004a | 1513 | return hash % MAX_DELTA_CACHE; |
e5e01619 LT |
1514 | } |
1515 | ||
62f255ad | 1516 | static void *cache_or_unpack_entry(struct packed_git *p, off_t base_offset, |
a0cba108 | 1517 | unsigned long *base_size, enum object_type *type, int keep_cache) |
62f255ad | 1518 | { |
e5e01619 LT |
1519 | void *ret; |
1520 | unsigned long hash = pack_entry_hash(p, base_offset); | |
1521 | struct delta_base_cache_entry *ent = delta_base_cache + hash; | |
1522 | ||
1523 | ret = ent->data; | |
1524 | if (ret && ent->p == p && ent->base_offset == base_offset) | |
1525 | goto found_cache_entry; | |
62f255ad | 1526 | return unpack_entry(p, base_offset, type, base_size); |
e5e01619 LT |
1527 | |
1528 | found_cache_entry: | |
18bdec11 | 1529 | if (!keep_cache) { |
a0cba108 | 1530 | ent->data = NULL; |
5e08ecbf NP |
1531 | ent->lru.next->prev = ent->lru.prev; |
1532 | ent->lru.prev->next = ent->lru.next; | |
18bdec11 | 1533 | delta_base_cached -= ent->size; |
182af834 PH |
1534 | } else { |
1535 | ret = xmemdupz(ent->data, ent->size); | |
a0cba108 | 1536 | } |
e5e01619 LT |
1537 | *type = ent->type; |
1538 | *base_size = ent->size; | |
1539 | return ret; | |
62f255ad LT |
1540 | } |
1541 | ||
18bdec11 SP |
1542 | static inline void release_delta_base_cache(struct delta_base_cache_entry *ent) |
1543 | { | |
1544 | if (ent->data) { | |
1545 | free(ent->data); | |
1546 | ent->data = NULL; | |
5e08ecbf NP |
1547 | ent->lru.next->prev = ent->lru.prev; |
1548 | ent->lru.prev->next = ent->lru.next; | |
18bdec11 SP |
1549 | delta_base_cached -= ent->size; |
1550 | } | |
1551 | } | |
1552 | ||
62f255ad LT |
1553 | static void add_delta_base_cache(struct packed_git *p, off_t base_offset, |
1554 | void *base, unsigned long base_size, enum object_type type) | |
1555 | { | |
5e08ecbf | 1556 | unsigned long hash = pack_entry_hash(p, base_offset); |
e5e01619 | 1557 | struct delta_base_cache_entry *ent = delta_base_cache + hash; |
5e08ecbf | 1558 | struct delta_base_cache_lru_list *lru; |
e5e01619 | 1559 | |
18bdec11 SP |
1560 | release_delta_base_cache(ent); |
1561 | delta_base_cached += base_size; | |
5e08ecbf NP |
1562 | |
1563 | for (lru = delta_base_cache_lru.next; | |
1564 | delta_base_cached > delta_base_cache_limit | |
1565 | && lru != &delta_base_cache_lru; | |
1566 | lru = lru->next) { | |
1567 | struct delta_base_cache_entry *f = (void *)lru; | |
18bdec11 SP |
1568 | if (f->type == OBJ_BLOB) |
1569 | release_delta_base_cache(f); | |
1570 | } | |
5e08ecbf NP |
1571 | for (lru = delta_base_cache_lru.next; |
1572 | delta_base_cached > delta_base_cache_limit | |
1573 | && lru != &delta_base_cache_lru; | |
1574 | lru = lru->next) { | |
1575 | struct delta_base_cache_entry *f = (void *)lru; | |
1576 | release_delta_base_cache(f); | |
1577 | } | |
18bdec11 | 1578 | |
e5e01619 LT |
1579 | ent->p = p; |
1580 | ent->base_offset = base_offset; | |
1581 | ent->type = type; | |
1582 | ent->data = base; | |
1583 | ent->size = base_size; | |
5e08ecbf NP |
1584 | ent->lru.next = &delta_base_cache_lru; |
1585 | ent->lru.prev = delta_base_cache_lru.prev; | |
1586 | delta_base_cache_lru.prev->next = &ent->lru; | |
1587 | delta_base_cache_lru.prev = &ent->lru; | |
62f255ad LT |
1588 | } |
1589 | ||
eb950c19 | 1590 | static void *unpack_delta_entry(struct packed_git *p, |
03e79c88 | 1591 | struct pack_window **w_curs, |
c4001d92 | 1592 | off_t curpos, |
1f688557 | 1593 | unsigned long delta_size, |
c4001d92 | 1594 | off_t obj_offset, |
21666f1a | 1595 | enum object_type *type, |
eb950c19 | 1596 | unsigned long *sizep) |
1f688557 | 1597 | { |
7c3e8be3 | 1598 | void *delta_data, *result, *base; |
c4001d92 SP |
1599 | unsigned long base_size; |
1600 | off_t base_offset; | |
43057304 | 1601 | |
21666f1a | 1602 | base_offset = get_delta_base(p, w_curs, &curpos, *type, obj_offset); |
a0cba108 | 1603 | base = cache_or_unpack_entry(p, base_offset, &base_size, type, 0); |
67686d95 | 1604 | if (!base) |
c4001d92 SP |
1605 | die("failed to read delta base object" |
1606 | " at %"PRIuMAX" from %s", | |
1607 | (uintmax_t)base_offset, p->pack_name); | |
67686d95 | 1608 | |
2b87c45b | 1609 | delta_data = unpack_compressed_entry(p, w_curs, curpos, delta_size); |
9064d87b SP |
1610 | if (!delta_data) |
1611 | die("failed to unpack compressed delta" | |
1612 | " at %"PRIuMAX" from %s", | |
1613 | (uintmax_t)curpos, p->pack_name); | |
1f688557 JH |
1614 | result = patch_delta(base, base_size, |
1615 | delta_data, delta_size, | |
21666f1a | 1616 | sizep); |
1f688557 JH |
1617 | if (!result) |
1618 | die("failed to apply delta"); | |
1619 | free(delta_data); | |
62f255ad | 1620 | add_delta_base_cache(p, base_offset, base, base_size, *type); |
1f688557 JH |
1621 | return result; |
1622 | } | |
1623 | ||
c4001d92 | 1624 | void *unpack_entry(struct packed_git *p, off_t obj_offset, |
21666f1a | 1625 | enum object_type *type, unsigned long *sizep) |
1f688557 | 1626 | { |
03e79c88 | 1627 | struct pack_window *w_curs = NULL; |
c4001d92 | 1628 | off_t curpos = obj_offset; |
21666f1a | 1629 | void *data; |
1f688557 | 1630 | |
21666f1a NP |
1631 | *type = unpack_object_header(p, &w_curs, &curpos, sizep); |
1632 | switch (*type) { | |
eb32d236 NP |
1633 | case OBJ_OFS_DELTA: |
1634 | case OBJ_REF_DELTA: | |
21666f1a NP |
1635 | data = unpack_delta_entry(p, &w_curs, curpos, *sizep, |
1636 | obj_offset, type, sizep); | |
4d703a1a | 1637 | break; |
a733cb60 | 1638 | case OBJ_COMMIT: |
a733cb60 | 1639 | case OBJ_TREE: |
a733cb60 | 1640 | case OBJ_BLOB: |
a733cb60 | 1641 | case OBJ_TAG: |
21666f1a | 1642 | data = unpack_compressed_entry(p, &w_curs, curpos, *sizep); |
4d703a1a | 1643 | break; |
1f688557 | 1644 | default: |
21666f1a | 1645 | die("unknown object type %i in %s", *type, p->pack_name); |
1f688557 | 1646 | } |
03e79c88 | 1647 | unuse_pack(&w_curs); |
21666f1a | 1648 | return data; |
1f688557 JH |
1649 | } |
1650 | ||
d079837e | 1651 | const unsigned char *nth_packed_object_sha1(struct packed_git *p, |
d72308e0 | 1652 | uint32_t n) |
9a217f2a | 1653 | { |
42873078 | 1654 | const unsigned char *index = p->index_data; |
d079837e SP |
1655 | if (!index) { |
1656 | if (open_pack_index(p)) | |
1657 | return NULL; | |
1658 | index = p->index_data; | |
1659 | } | |
57059091 | 1660 | if (n >= p->num_objects) |
d72308e0 | 1661 | return NULL; |
74e34e1f NP |
1662 | index += 4 * 256; |
1663 | if (p->index_version == 1) { | |
1664 | return index + 24 * n + 4; | |
1665 | } else { | |
1666 | index += 8; | |
1667 | return index + 20 * n; | |
1668 | } | |
1669 | } | |
1670 | ||
1671 | static off_t nth_packed_object_offset(const struct packed_git *p, uint32_t n) | |
1672 | { | |
1673 | const unsigned char *index = p->index_data; | |
1674 | index += 4 * 256; | |
1675 | if (p->index_version == 1) { | |
1676 | return ntohl(*((uint32_t *)(index + 24 * n))); | |
1677 | } else { | |
1678 | uint32_t off; | |
1679 | index += 8 + p->num_objects * (20 + 4); | |
1680 | off = ntohl(*((uint32_t *)(index + 4 * n))); | |
1681 | if (!(off & 0x80000000)) | |
1682 | return off; | |
1683 | index += p->num_objects * 4 + (off & 0x7fffffff) * 8; | |
1684 | return (((uint64_t)ntohl(*((uint32_t *)(index + 0)))) << 32) | | |
1685 | ntohl(*((uint32_t *)(index + 4))); | |
1686 | } | |
9a217f2a JH |
1687 | } |
1688 | ||
c4001d92 | 1689 | off_t find_pack_entry_one(const unsigned char *sha1, |
43057304 | 1690 | struct packed_git *p) |
1f688557 | 1691 | { |
42873078 | 1692 | const uint32_t *level1_ofs = p->index_data; |
42873078 | 1693 | const unsigned char *index = p->index_data; |
628522ec JH |
1694 | unsigned hi, lo, stride; |
1695 | static int use_lookup = -1; | |
1696 | static int debug_lookup = -1; | |
1697 | ||
1698 | if (debug_lookup < 0) | |
1699 | debug_lookup = !!getenv("GIT_DEBUG_LOOKUP"); | |
42873078 | 1700 | |
d079837e SP |
1701 | if (!index) { |
1702 | if (open_pack_index(p)) | |
1703 | return 0; | |
1704 | level1_ofs = p->index_data; | |
1705 | index = p->index_data; | |
1706 | } | |
74e34e1f NP |
1707 | if (p->index_version > 1) { |
1708 | level1_ofs += 2; | |
1709 | index += 8; | |
1710 | } | |
42873078 | 1711 | index += 4 * 256; |
74e34e1f NP |
1712 | hi = ntohl(level1_ofs[*sha1]); |
1713 | lo = ((*sha1 == 0x0) ? 0 : ntohl(level1_ofs[*sha1 - 1])); | |
628522ec JH |
1714 | if (p->index_version > 1) { |
1715 | stride = 20; | |
1716 | } else { | |
1717 | stride = 24; | |
1718 | index += 4; | |
1719 | } | |
1720 | ||
1721 | if (debug_lookup) | |
1722 | printf("%02x%02x%02x... lo %u hi %u nr %u\n", | |
1723 | sha1[0], sha1[1], sha1[2], lo, hi, p->num_objects); | |
1724 | ||
1725 | if (use_lookup < 0) | |
1726 | use_lookup = !!getenv("GIT_USE_LOOKUP"); | |
1727 | if (use_lookup) { | |
1728 | int pos = sha1_entry_pos(index, stride, 0, | |
1729 | lo, hi, p->num_objects, sha1); | |
1730 | if (pos < 0) | |
1731 | return 0; | |
1732 | return nth_packed_object_offset(p, pos); | |
1733 | } | |
1f688557 JH |
1734 | |
1735 | do { | |
74e34e1f | 1736 | unsigned mi = (lo + hi) / 2; |
628522ec JH |
1737 | int cmp = hashcmp(index + mi * stride, sha1); |
1738 | ||
1739 | if (debug_lookup) | |
1740 | printf("lo %u hi %u rg %u mi %u\n", | |
1741 | lo, hi, hi - lo, mi); | |
43057304 | 1742 | if (!cmp) |
74e34e1f | 1743 | return nth_packed_object_offset(p, mi); |
1f688557 JH |
1744 | if (cmp > 0) |
1745 | hi = mi; | |
1746 | else | |
1747 | lo = mi+1; | |
1748 | } while (lo < hi); | |
1749 | return 0; | |
1750 | } | |
1751 | ||
000dfd3f | 1752 | int matches_pack_name(struct packed_git *p, const char *name) |
d4ff6d92 SP |
1753 | { |
1754 | const char *last_c, *c; | |
1755 | ||
000dfd3f JH |
1756 | if (!strcmp(p->pack_name, name)) |
1757 | return 1; | |
d4ff6d92 SP |
1758 | |
1759 | for (c = p->pack_name, last_c = c; *c;) | |
1760 | if (*c == '/') | |
1761 | last_c = ++c; | |
1762 | else | |
1763 | ++c; | |
000dfd3f JH |
1764 | if (!strcmp(last_c, name)) |
1765 | return 1; | |
d4ff6d92 | 1766 | |
000dfd3f | 1767 | return 0; |
d4ff6d92 SP |
1768 | } |
1769 | ||
106d710b | 1770 | static int find_pack_entry(const unsigned char *sha1, struct pack_entry *e, const char **ignore_packed) |
1f688557 | 1771 | { |
f7c22cc6 | 1772 | static struct packed_git *last_found = (void *)1; |
1f688557 | 1773 | struct packed_git *p; |
c4001d92 | 1774 | off_t offset; |
43057304 | 1775 | |
1f688557 | 1776 | prepare_packed_git(); |
f7c22cc6 NP |
1777 | if (!packed_git) |
1778 | return 0; | |
1779 | p = (last_found == (void *)1) ? packed_git : last_found; | |
1f688557 | 1780 | |
f7c22cc6 | 1781 | do { |
106d710b JH |
1782 | if (ignore_packed) { |
1783 | const char **ig; | |
1784 | for (ig = ignore_packed; *ig; ig++) | |
000dfd3f | 1785 | if (matches_pack_name(p, *ig)) |
106d710b JH |
1786 | break; |
1787 | if (*ig) | |
f7c22cc6 | 1788 | goto next; |
106d710b | 1789 | } |
f7c22cc6 | 1790 | |
43057304 NP |
1791 | offset = find_pack_entry_one(sha1, p); |
1792 | if (offset) { | |
c715f783 SP |
1793 | /* |
1794 | * We are about to tell the caller where they can | |
1795 | * locate the requested object. We better make | |
1796 | * sure the packfile is still here and can be | |
1797 | * accessed before supplying that answer, as | |
1798 | * it may have been deleted since the index | |
1799 | * was loaded! | |
1800 | */ | |
1801 | if (p->pack_fd == -1 && open_packed_git(p)) { | |
1802 | error("packfile %s cannot be accessed", p->pack_name); | |
f7c22cc6 | 1803 | goto next; |
c715f783 | 1804 | } |
43057304 NP |
1805 | e->offset = offset; |
1806 | e->p = p; | |
1807 | hashcpy(e->sha1, sha1); | |
f7c22cc6 | 1808 | last_found = p; |
1f688557 | 1809 | return 1; |
43057304 | 1810 | } |
f7c22cc6 NP |
1811 | |
1812 | next: | |
1813 | if (p == last_found) | |
1814 | p = packed_git; | |
1815 | else | |
1816 | p = p->next; | |
1817 | if (p == last_found) | |
1818 | p = p->next; | |
1819 | } while (p); | |
1f688557 JH |
1820 | return 0; |
1821 | } | |
1822 | ||
a6080a0a | 1823 | struct packed_git *find_sha1_pack(const unsigned char *sha1, |
bf592c50 DB |
1824 | struct packed_git *packs) |
1825 | { | |
1826 | struct packed_git *p; | |
bf592c50 DB |
1827 | |
1828 | for (p = packs; p; p = p->next) { | |
43057304 | 1829 | if (find_pack_entry_one(sha1, p)) |
bf592c50 DB |
1830 | return p; |
1831 | } | |
1832 | return NULL; | |
21666f1a | 1833 | |
bf592c50 DB |
1834 | } |
1835 | ||
21666f1a | 1836 | static int sha1_loose_object_info(const unsigned char *sha1, unsigned long *sizep) |
65c2e0c3 | 1837 | { |
36e4d74a | 1838 | int status; |
65c2e0c3 JH |
1839 | unsigned long mapsize, size; |
1840 | void *map; | |
1841 | z_stream stream; | |
d65a16f6 | 1842 | char hdr[32]; |
65c2e0c3 | 1843 | |
bb6b8e4f | 1844 | map = map_sha1_file(sha1, &mapsize); |
f0df4ed5 JS |
1845 | if (!map) |
1846 | return error("unable to find %s", sha1_to_hex(sha1)); | |
36e4d74a JH |
1847 | if (unpack_sha1_header(&stream, map, mapsize, hdr, sizeof(hdr)) < 0) |
1848 | status = error("unable to unpack %s header", | |
1849 | sha1_to_hex(sha1)); | |
21666f1a | 1850 | else if ((status = parse_sha1_header(hdr, &size)) < 0) |
36e4d74a | 1851 | status = error("unable to parse %s header", sha1_to_hex(sha1)); |
21666f1a NP |
1852 | else if (sizep) |
1853 | *sizep = size; | |
65c2e0c3 JH |
1854 | inflateEnd(&stream); |
1855 | munmap(map, mapsize); | |
1856 | return status; | |
1857 | } | |
1858 | ||
21666f1a | 1859 | int sha1_object_info(const unsigned char *sha1, unsigned long *sizep) |
f0df4ed5 | 1860 | { |
f0df4ed5 JS |
1861 | struct pack_entry e; |
1862 | ||
1863 | if (!find_pack_entry(sha1, &e, NULL)) { | |
1864 | reprepare_packed_git(); | |
1865 | if (!find_pack_entry(sha1, &e, NULL)) | |
21666f1a | 1866 | return sha1_loose_object_info(sha1, sizep); |
f0df4ed5 | 1867 | } |
21666f1a | 1868 | return packed_object_info(e.p, e.offset, sizep); |
f0df4ed5 JS |
1869 | } |
1870 | ||
21666f1a NP |
1871 | static void *read_packed_sha1(const unsigned char *sha1, |
1872 | enum object_type *type, unsigned long *size) | |
1f688557 JH |
1873 | { |
1874 | struct pack_entry e; | |
1875 | ||
8276c007 | 1876 | if (!find_pack_entry(sha1, &e, NULL)) |
1f688557 | 1877 | return NULL; |
8276c007 | 1878 | else |
a0cba108 | 1879 | return cache_or_unpack_entry(e.p, e.offset, size, type, 1); |
1f688557 JH |
1880 | } |
1881 | ||
d66b37bb JH |
1882 | /* |
1883 | * This is meant to hold a *small* number of objects that you would | |
1884 | * want read_sha1_file() to be able to return, but yet you do not want | |
1885 | * to write them into the object store (e.g. a browse-only | |
1886 | * application). | |
1887 | */ | |
1888 | static struct cached_object { | |
1889 | unsigned char sha1[20]; | |
21666f1a | 1890 | enum object_type type; |
d66b37bb JH |
1891 | void *buf; |
1892 | unsigned long size; | |
1893 | } *cached_objects; | |
1894 | static int cached_object_nr, cached_object_alloc; | |
1895 | ||
346245a1 JK |
1896 | static struct cached_object empty_tree = { |
1897 | /* empty tree sha1: 4b825dc642cb6eb9a060e54bf8d69288fbee4904 */ | |
1898 | "\x4b\x82\x5d\xc6\x42\xcb\x6e\xb9\xa0\x60" | |
1899 | "\xe5\x4b\xf8\xd6\x92\x88\xfb\xee\x49\x04", | |
1900 | OBJ_TREE, | |
1901 | "", | |
1902 | 0 | |
1903 | }; | |
1904 | ||
d66b37bb JH |
1905 | static struct cached_object *find_cached_object(const unsigned char *sha1) |
1906 | { | |
1907 | int i; | |
1908 | struct cached_object *co = cached_objects; | |
1909 | ||
1910 | for (i = 0; i < cached_object_nr; i++, co++) { | |
1911 | if (!hashcmp(co->sha1, sha1)) | |
1912 | return co; | |
1913 | } | |
346245a1 JK |
1914 | if (!hashcmp(sha1, empty_tree.sha1)) |
1915 | return &empty_tree; | |
d66b37bb JH |
1916 | return NULL; |
1917 | } | |
1918 | ||
21666f1a NP |
1919 | int pretend_sha1_file(void *buf, unsigned long len, enum object_type type, |
1920 | unsigned char *sha1) | |
d66b37bb JH |
1921 | { |
1922 | struct cached_object *co; | |
1923 | ||
21666f1a | 1924 | hash_sha1_file(buf, len, typename(type), sha1); |
d66b37bb JH |
1925 | if (has_sha1_file(sha1) || find_cached_object(sha1)) |
1926 | return 0; | |
1927 | if (cached_object_alloc <= cached_object_nr) { | |
1928 | cached_object_alloc = alloc_nr(cached_object_alloc); | |
1929 | cached_objects = xrealloc(cached_objects, | |
1930 | sizeof(*cached_objects) * | |
1931 | cached_object_alloc); | |
1932 | } | |
1933 | co = &cached_objects[cached_object_nr++]; | |
1934 | co->size = len; | |
21666f1a | 1935 | co->type = type; |
efa13f7b JH |
1936 | co->buf = xmalloc(len); |
1937 | memcpy(co->buf, buf, len); | |
d66b37bb JH |
1938 | hashcpy(co->sha1, sha1); |
1939 | return 0; | |
1940 | } | |
1941 | ||
21666f1a NP |
1942 | void *read_sha1_file(const unsigned char *sha1, enum object_type *type, |
1943 | unsigned long *size) | |
0fcfd160 LT |
1944 | { |
1945 | unsigned long mapsize; | |
1946 | void *map, *buf; | |
d66b37bb JH |
1947 | struct cached_object *co; |
1948 | ||
1949 | co = find_cached_object(sha1); | |
1950 | if (co) { | |
21666f1a | 1951 | *type = co->type; |
d66b37bb | 1952 | *size = co->size; |
182af834 | 1953 | return xmemdupz(co->buf, co->size); |
d66b37bb | 1954 | } |
0fcfd160 | 1955 | |
8276c007 PE |
1956 | buf = read_packed_sha1(sha1, type, size); |
1957 | if (buf) | |
1958 | return buf; | |
bb6b8e4f | 1959 | map = map_sha1_file(sha1, &mapsize); |
0fcfd160 | 1960 | if (map) { |
7efbff75 | 1961 | buf = unpack_sha1_file(map, mapsize, type, size, sha1); |
0fcfd160 LT |
1962 | munmap(map, mapsize); |
1963 | return buf; | |
1964 | } | |
637cdd9d | 1965 | reprepare_packed_git(); |
8276c007 | 1966 | return read_packed_sha1(sha1, type, size); |
0fcfd160 LT |
1967 | } |
1968 | ||
40469ee9 | 1969 | void *read_object_with_reference(const unsigned char *sha1, |
21666f1a | 1970 | const char *required_type_name, |
40469ee9 JH |
1971 | unsigned long *size, |
1972 | unsigned char *actual_sha1_return) | |
f4913f91 | 1973 | { |
21666f1a | 1974 | enum object_type type, required_type; |
f4913f91 JH |
1975 | void *buffer; |
1976 | unsigned long isize; | |
40469ee9 | 1977 | unsigned char actual_sha1[20]; |
f4913f91 | 1978 | |
21666f1a | 1979 | required_type = type_from_string(required_type_name); |
e702496e | 1980 | hashcpy(actual_sha1, sha1); |
40469ee9 JH |
1981 | while (1) { |
1982 | int ref_length = -1; | |
1983 | const char *ref_type = NULL; | |
f4913f91 | 1984 | |
21666f1a | 1985 | buffer = read_sha1_file(actual_sha1, &type, &isize); |
40469ee9 JH |
1986 | if (!buffer) |
1987 | return NULL; | |
21666f1a | 1988 | if (type == required_type) { |
40469ee9 JH |
1989 | *size = isize; |
1990 | if (actual_sha1_return) | |
e702496e | 1991 | hashcpy(actual_sha1_return, actual_sha1); |
40469ee9 JH |
1992 | return buffer; |
1993 | } | |
1994 | /* Handle references */ | |
21666f1a | 1995 | else if (type == OBJ_COMMIT) |
40469ee9 | 1996 | ref_type = "tree "; |
21666f1a | 1997 | else if (type == OBJ_TAG) |
40469ee9 JH |
1998 | ref_type = "object "; |
1999 | else { | |
2000 | free(buffer); | |
2001 | return NULL; | |
2002 | } | |
2003 | ref_length = strlen(ref_type); | |
f4913f91 | 2004 | |
50974ec9 MK |
2005 | if (ref_length + 40 > isize || |
2006 | memcmp(buffer, ref_type, ref_length) || | |
1d7f171c | 2007 | get_sha1_hex((char *) buffer + ref_length, actual_sha1)) { |
40469ee9 JH |
2008 | free(buffer); |
2009 | return NULL; | |
2010 | } | |
1cf58e72 | 2011 | free(buffer); |
40469ee9 JH |
2012 | /* Now we have the ID of the referred-to object in |
2013 | * actual_sha1. Check again. */ | |
f4913f91 | 2014 | } |
f4913f91 JH |
2015 | } |
2016 | ||
ce9fbf16 | 2017 | static void write_sha1_file_prepare(const void *buf, unsigned long len, |
972a9155 | 2018 | const char *type, unsigned char *sha1, |
d65a16f6 | 2019 | char *hdr, int *hdrlen) |
d410c0f5 JH |
2020 | { |
2021 | SHA_CTX c; | |
2022 | ||
2023 | /* Generate the header */ | |
d65a16f6 | 2024 | *hdrlen = sprintf(hdr, "%s %lu", type, len)+1; |
d410c0f5 JH |
2025 | |
2026 | /* Sha1.. */ | |
2027 | SHA1_Init(&c); | |
2028 | SHA1_Update(&c, hdr, *hdrlen); | |
2029 | SHA1_Update(&c, buf, len); | |
2030 | SHA1_Final(sha1, &c); | |
d410c0f5 JH |
2031 | } |
2032 | ||
230f1322 LT |
2033 | /* |
2034 | * Move the just written object into its final resting place | |
2035 | */ | |
839837b9 | 2036 | int move_temp_to_file(const char *tmpfile, const char *filename) |
230f1322 | 2037 | { |
5723fe7e | 2038 | int ret = link(tmpfile, filename); |
7ebb6fca LT |
2039 | |
2040 | /* | |
2041 | * Coda hack - coda doesn't like cross-directory links, | |
2042 | * so we fall back to a rename, which will mean that it | |
2043 | * won't be able to check collisions, but that's not a | |
2044 | * big deal. | |
2045 | * | |
2046 | * The same holds for FAT formatted media. | |
2047 | * | |
2048 | * When this succeeds, we just return 0. We have nothing | |
2049 | * left to unlink. | |
2050 | */ | |
2051 | if (ret && ret != EEXIST) { | |
2052 | if (!rename(tmpfile, filename)) | |
230f1322 | 2053 | return 0; |
9e48b389 | 2054 | ret = errno; |
230f1322 LT |
2055 | } |
2056 | unlink(tmpfile); | |
2057 | if (ret) { | |
2058 | if (ret != EEXIST) { | |
916d081b | 2059 | return error("unable to write sha1 filename %s: %s\n", filename, strerror(ret)); |
230f1322 LT |
2060 | } |
2061 | /* FIXME!!! Collision check here ? */ | |
2062 | } | |
2063 | ||
2064 | return 0; | |
2065 | } | |
2066 | ||
4d548150 LT |
2067 | static int write_buffer(int fd, const void *buf, size_t len) |
2068 | { | |
d34cf19b | 2069 | if (write_in_full(fd, buf, len) < 0) |
93822c22 | 2070 | return error("file write error (%s)", strerror(errno)); |
4d548150 LT |
2071 | return 0; |
2072 | } | |
2073 | ||
ce9fbf16 | 2074 | int hash_sha1_file(const void *buf, unsigned long len, const char *type, |
abdc3fc8 RS |
2075 | unsigned char *sha1) |
2076 | { | |
d65a16f6 | 2077 | char hdr[32]; |
abdc3fc8 RS |
2078 | int hdrlen; |
2079 | write_sha1_file_prepare(buf, len, type, sha1, hdr, &hdrlen); | |
2080 | return 0; | |
2081 | } | |
2082 | ||
e9039dd3 LT |
2083 | /* Finalize a file on disk, and close it. */ |
2084 | static void close_sha1_file(int fd) | |
2085 | { | |
2086 | /* For safe-mode, we could fsync_or_die(fd, "sha1 file") here */ | |
2087 | fchmod(fd, 0444); | |
2088 | if (close(fd) != 0) | |
2089 | die("unable to write sha1 file"); | |
2090 | } | |
2091 | ||
5723fe7e LT |
2092 | /* Size of directory component, including the ending '/' */ |
2093 | static inline int directory_size(const char *filename) | |
2094 | { | |
2095 | const char *s = strrchr(filename, '/'); | |
2096 | if (!s) | |
2097 | return 0; | |
2098 | return s - filename + 1; | |
2099 | } | |
2100 | ||
2101 | /* | |
2102 | * This creates a temporary file in the same directory as the final | |
2103 | * 'filename' | |
2104 | * | |
2105 | * We want to avoid cross-directory filename renames, because those | |
2106 | * can have problems on various filesystems (FAT, NFS, Coda). | |
2107 | */ | |
2108 | static int create_tmpfile(char *buffer, size_t bufsiz, const char *filename) | |
2109 | { | |
2110 | int fd, dirlen = directory_size(filename); | |
2111 | ||
2112 | if (dirlen + 20 > bufsiz) { | |
2113 | errno = ENAMETOOLONG; | |
2114 | return -1; | |
2115 | } | |
2116 | memcpy(buffer, filename, dirlen); | |
2117 | strcpy(buffer + dirlen, "tmp_obj_XXXXXX"); | |
2118 | fd = mkstemp(buffer); | |
2119 | if (fd < 0 && dirlen) { | |
2120 | /* Make sure the directory exists */ | |
2121 | buffer[dirlen-1] = 0; | |
3bfaf018 | 2122 | if (mkdir(buffer, 0777) || adjust_shared_perm(buffer)) |
5723fe7e LT |
2123 | return -1; |
2124 | ||
2125 | /* Try again */ | |
2126 | strcpy(buffer + dirlen - 1, "/tmp_obj_XXXXXX"); | |
2127 | fd = mkstemp(buffer); | |
2128 | } | |
2129 | return fd; | |
2130 | } | |
2131 | ||
bbac7311 NP |
2132 | static int write_loose_object(const unsigned char *sha1, char *hdr, int hdrlen, |
2133 | void *buf, unsigned long len, time_t mtime) | |
0fcfd160 | 2134 | { |
bbac7311 | 2135 | int fd, size, ret; |
bf0f910d | 2136 | unsigned char *compressed; |
0fcfd160 | 2137 | z_stream stream; |
706bc531 | 2138 | char *filename; |
aac17941 | 2139 | static char tmpfile[PATH_MAX]; |
a44c9a5e | 2140 | |
972a9155 | 2141 | filename = sha1_file_name(sha1); |
5723fe7e | 2142 | fd = create_tmpfile(tmpfile, sizeof(tmpfile), filename); |
aac17941 | 2143 | if (fd < 0) { |
916d081b PB |
2144 | if (errno == EPERM) |
2145 | return error("insufficient permission for adding an object to repository database %s\n", get_object_directory()); | |
2146 | else | |
2147 | return error("unable to create temporary sha1 filename %s: %s\n", tmpfile, strerror(errno)); | |
aac17941 LT |
2148 | } |
2149 | ||
0fcfd160 LT |
2150 | /* Set it up */ |
2151 | memset(&stream, 0, sizeof(stream)); | |
12f6c308 | 2152 | deflateInit(&stream, zlib_compression_level); |
93821bd9 | 2153 | size = 8 + deflateBound(&stream, len+hdrlen); |
812666c8 | 2154 | compressed = xmalloc(size); |
0fcfd160 LT |
2155 | |
2156 | /* Compress it */ | |
0fcfd160 LT |
2157 | stream.next_out = compressed; |
2158 | stream.avail_out = size; | |
a44c9a5e LT |
2159 | |
2160 | /* First header.. */ | |
d65a16f6 | 2161 | stream.next_in = (unsigned char *)hdr; |
a44c9a5e | 2162 | stream.avail_in = hdrlen; |
726f852b NP |
2163 | while (deflate(&stream, 0) == Z_OK) |
2164 | /* nothing */; | |
a44c9a5e LT |
2165 | |
2166 | /* Then the data itself.. */ | |
2167 | stream.next_in = buf; | |
2168 | stream.avail_in = len; | |
ac54c277 LT |
2169 | ret = deflate(&stream, Z_FINISH); |
2170 | if (ret != Z_STREAM_END) | |
2171 | die("unable to deflate new object %s (%d)", sha1_to_hex(sha1), ret); | |
2172 | ||
2173 | ret = deflateEnd(&stream); | |
2174 | if (ret != Z_OK) | |
2175 | die("deflateEnd on object %s failed (%d)", sha1_to_hex(sha1), ret); | |
2176 | ||
0fcfd160 LT |
2177 | size = stream.total_out; |
2178 | ||
4d548150 LT |
2179 | if (write_buffer(fd, compressed, size) < 0) |
2180 | die("unable to write sha1 file"); | |
e9039dd3 | 2181 | close_sha1_file(fd); |
383f85b7 | 2182 | free(compressed); |
0fcfd160 | 2183 | |
bbac7311 NP |
2184 | if (mtime) { |
2185 | struct utimbuf utb; | |
2186 | utb.actime = mtime; | |
2187 | utb.modtime = mtime; | |
2188 | if (utime(tmpfile, &utb) < 0) | |
2189 | warning("failed utime() on %s: %s", | |
2190 | tmpfile, strerror(errno)); | |
2191 | } | |
2192 | ||
230f1322 | 2193 | return move_temp_to_file(tmpfile, filename); |
0fcfd160 | 2194 | } |
8237b185 | 2195 | |
bbac7311 NP |
2196 | int write_sha1_file(void *buf, unsigned long len, const char *type, unsigned char *returnsha1) |
2197 | { | |
2198 | unsigned char sha1[20]; | |
2199 | char hdr[32]; | |
2200 | int hdrlen; | |
2201 | ||
2202 | /* Normally if we have it in the pack then we do not bother writing | |
2203 | * it out into .git/objects/??/?{38} file. | |
2204 | */ | |
2205 | write_sha1_file_prepare(buf, len, type, sha1, hdr, &hdrlen); | |
2206 | if (returnsha1) | |
2207 | hashcpy(returnsha1, sha1); | |
2208 | if (has_sha1_file(sha1)) | |
2209 | return 0; | |
2210 | return write_loose_object(sha1, hdr, hdrlen, buf, len, 0); | |
2211 | } | |
2212 | ||
2213 | int force_object_loose(const unsigned char *sha1, time_t mtime) | |
2214 | { | |
bbac7311 NP |
2215 | void *buf; |
2216 | unsigned long len; | |
2217 | enum object_type type; | |
2218 | char hdr[32]; | |
2219 | int hdrlen; | |
2220 | ||
c529d75a | 2221 | if (has_loose_object(sha1)) |
bbac7311 NP |
2222 | return 0; |
2223 | buf = read_packed_sha1(sha1, &type, &len); | |
2224 | if (!buf) | |
2225 | return error("cannot read sha1_file for %s", sha1_to_hex(sha1)); | |
2226 | hdrlen = sprintf(hdr, "%s %lu", typename(type), len) + 1; | |
2227 | return write_loose_object(sha1, hdr, hdrlen, buf, len, mtime); | |
2228 | } | |
2229 | ||
bf592c50 DB |
2230 | int has_pack_index(const unsigned char *sha1) |
2231 | { | |
2232 | struct stat st; | |
2233 | if (stat(sha1_pack_index_name(sha1), &st)) | |
2234 | return 0; | |
2235 | return 1; | |
2236 | } | |
2237 | ||
2238 | int has_pack_file(const unsigned char *sha1) | |
2239 | { | |
2240 | struct stat st; | |
2241 | if (stat(sha1_pack_name(sha1), &st)) | |
2242 | return 0; | |
2243 | return 1; | |
2244 | } | |
2245 | ||
106d710b | 2246 | int has_sha1_pack(const unsigned char *sha1, const char **ignore_packed) |
dade09c2 LT |
2247 | { |
2248 | struct pack_entry e; | |
106d710b | 2249 | return find_pack_entry(sha1, &e, ignore_packed); |
dade09c2 LT |
2250 | } |
2251 | ||
8237b185 DB |
2252 | int has_sha1_file(const unsigned char *sha1) |
2253 | { | |
1f688557 JH |
2254 | struct pack_entry e; |
2255 | ||
106d710b | 2256 | if (find_pack_entry(sha1, &e, NULL)) |
1f688557 | 2257 | return 1; |
c529d75a | 2258 | return has_loose_object(sha1); |
8237b185 | 2259 | } |
74400e71 | 2260 | |
e7332f96 BE |
2261 | int index_pipe(unsigned char *sha1, int fd, const char *type, int write_object) |
2262 | { | |
fd17f5b5 | 2263 | struct strbuf buf; |
e7332f96 | 2264 | int ret; |
e7332f96 | 2265 | |
fd17f5b5 PH |
2266 | strbuf_init(&buf, 0); |
2267 | if (strbuf_read(&buf, fd, 4096) < 0) { | |
2268 | strbuf_release(&buf); | |
024510c8 DB |
2269 | return -1; |
2270 | } | |
e7332f96 | 2271 | |
024510c8 | 2272 | if (!type) |
8e440259 | 2273 | type = blob_type; |
024510c8 | 2274 | if (write_object) |
fd17f5b5 | 2275 | ret = write_sha1_file(buf.buf, buf.len, type, sha1); |
abdc3fc8 | 2276 | else |
fd17f5b5 PH |
2277 | ret = hash_sha1_file(buf.buf, buf.len, type, sha1); |
2278 | strbuf_release(&buf); | |
2279 | ||
024510c8 DB |
2280 | return ret; |
2281 | } | |
2282 | ||
edaec3fb | 2283 | int index_fd(unsigned char *sha1, int fd, struct stat *st, int write_object, |
53bca91a | 2284 | enum object_type type, const char *path) |
74400e71 | 2285 | { |
dc49cd76 | 2286 | size_t size = xsize_t(st->st_size); |
3a55602e | 2287 | void *buf = NULL; |
6c510bee | 2288 | int ret, re_allocated = 0; |
74400e71 | 2289 | |
74400e71 | 2290 | if (size) |
c4712e45 | 2291 | buf = xmmap(NULL, size, PROT_READ, MAP_PRIVATE, fd, 0); |
74400e71 | 2292 | close(fd); |
74400e71 | 2293 | |
7672db20 | 2294 | if (!type) |
edaec3fb | 2295 | type = OBJ_BLOB; |
6c510bee LT |
2296 | |
2297 | /* | |
2298 | * Convert blobs to git internal format | |
2299 | */ | |
d0d8e14d | 2300 | if ((type == OBJ_BLOB) && S_ISREG(st->st_mode)) { |
5ecd293d PH |
2301 | struct strbuf nbuf; |
2302 | strbuf_init(&nbuf, 0); | |
21e5ad50 SP |
2303 | if (convert_to_git(path, buf, size, &nbuf, |
2304 | write_object ? safe_crlf : 0)) { | |
ac78e548 | 2305 | munmap(buf, size); |
b315c5c0 | 2306 | buf = strbuf_detach(&nbuf, &size); |
6c510bee LT |
2307 | re_allocated = 1; |
2308 | } | |
2309 | } | |
2310 | ||
7672db20 | 2311 | if (write_object) |
edaec3fb | 2312 | ret = write_sha1_file(buf, size, typename(type), sha1); |
abdc3fc8 | 2313 | else |
edaec3fb | 2314 | ret = hash_sha1_file(buf, size, typename(type), sha1); |
6c510bee LT |
2315 | if (re_allocated) { |
2316 | free(buf); | |
2317 | return ret; | |
2318 | } | |
aac17941 LT |
2319 | if (size) |
2320 | munmap(buf, size); | |
2321 | return ret; | |
74400e71 | 2322 | } |
ec1fcc16 JH |
2323 | |
2324 | int index_path(unsigned char *sha1, const char *path, struct stat *st, int write_object) | |
2325 | { | |
2326 | int fd; | |
2327 | char *target; | |
dc49cd76 | 2328 | size_t len; |
ec1fcc16 JH |
2329 | |
2330 | switch (st->st_mode & S_IFMT) { | |
2331 | case S_IFREG: | |
2332 | fd = open(path, O_RDONLY); | |
2333 | if (fd < 0) | |
2334 | return error("open(\"%s\"): %s", path, | |
2335 | strerror(errno)); | |
53bca91a | 2336 | if (index_fd(sha1, fd, st, write_object, OBJ_BLOB, path) < 0) |
ec1fcc16 JH |
2337 | return error("%s: failed to insert into database", |
2338 | path); | |
2339 | break; | |
2340 | case S_IFLNK: | |
dc49cd76 SP |
2341 | len = xsize_t(st->st_size); |
2342 | target = xmalloc(len + 1); | |
2343 | if (readlink(path, target, len + 1) != st->st_size) { | |
ec1fcc16 JH |
2344 | char *errstr = strerror(errno); |
2345 | free(target); | |
2346 | return error("readlink(\"%s\"): %s", path, | |
2347 | errstr); | |
2348 | } | |
abdc3fc8 | 2349 | if (!write_object) |
dc49cd76 SP |
2350 | hash_sha1_file(target, len, blob_type, sha1); |
2351 | else if (write_sha1_file(target, len, blob_type, sha1)) | |
ec1fcc16 JH |
2352 | return error("%s: failed to insert into database", |
2353 | path); | |
2354 | free(target); | |
2355 | break; | |
f35a6d3b LT |
2356 | case S_IFDIR: |
2357 | return resolve_gitlink_ref(path, "HEAD", sha1); | |
ec1fcc16 JH |
2358 | default: |
2359 | return error("%s: unsupported file type", path); | |
2360 | } | |
2361 | return 0; | |
2362 | } | |
a69e5429 JH |
2363 | |
2364 | int read_pack_header(int fd, struct pack_header *header) | |
2365 | { | |
c697ad14 HO |
2366 | if (read_in_full(fd, header, sizeof(*header)) < sizeof(*header)) |
2367 | /* "eof before pack header was fully read" */ | |
2368 | return PH_ERROR_EOF; | |
2369 | ||
a69e5429 JH |
2370 | if (header->hdr_signature != htonl(PACK_SIGNATURE)) |
2371 | /* "protocol error (pack signature mismatch detected)" */ | |
2372 | return PH_ERROR_PACK_SIGNATURE; | |
2373 | if (!pack_version_ok(header->hdr_version)) | |
2374 | /* "protocol error (pack version unsupported)" */ | |
2375 | return PH_ERROR_PROTOCOL; | |
2376 | return 0; | |
2377 | } |