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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" |
6eac50d8 | 10 | #include "string-list.h" |
697cc8ef | 11 | #include "lockfile.h" |
1f688557 | 12 | #include "delta.h" |
a733cb60 | 13 | #include "pack.h" |
8e440259 PE |
14 | #include "blob.h" |
15 | #include "commit.h" | |
4dd1fbc7 | 16 | #include "run-command.h" |
8e440259 PE |
17 | #include "tag.h" |
18 | #include "tree.h" | |
c879daa2 | 19 | #include "tree-walk.h" |
f35a6d3b | 20 | #include "refs.h" |
70f5d5d3 | 21 | #include "pack-revindex.h" |
628522ec | 22 | #include "sha1-lookup.h" |
568508e7 | 23 | #include "bulk-checkin.h" |
090ea126 | 24 | #include "streaming.h" |
543c5caa | 25 | #include "dir.h" |
0fcfd160 | 26 | |
144bde78 LT |
27 | #ifndef O_NOATIME |
28 | #if defined(__linux__) && (defined(__i386__) || defined(__PPC__)) | |
29 | #define O_NOATIME 01000000 | |
30 | #else | |
31 | #define O_NOATIME 0 | |
32 | #endif | |
33 | #endif | |
34 | ||
28bd70d8 JN |
35 | #define SZ_FMT PRIuMAX |
36 | static inline uintmax_t sz_fmt(size_t s) { return s; } | |
e05db0fd | 37 | |
96f1e58f | 38 | const unsigned char null_sha1[20]; |
88cd621d | 39 | |
c597ba80 NTND |
40 | /* |
41 | * This is meant to hold a *small* number of objects that you would | |
42 | * want read_sha1_file() to be able to return, but yet you do not want | |
43 | * to write them into the object store (e.g. a browse-only | |
44 | * application). | |
45 | */ | |
46 | static struct cached_object { | |
47 | unsigned char sha1[20]; | |
48 | enum object_type type; | |
49 | void *buf; | |
50 | unsigned long size; | |
51 | } *cached_objects; | |
52 | static int cached_object_nr, cached_object_alloc; | |
53 | ||
54 | static struct cached_object empty_tree = { | |
dab0d410 | 55 | EMPTY_TREE_SHA1_BIN_LITERAL, |
c597ba80 NTND |
56 | OBJ_TREE, |
57 | "", | |
58 | 0 | |
59 | }; | |
60 | ||
1b1005d1 MH |
61 | /* |
62 | * A pointer to the last packed_git in which an object was found. | |
63 | * When an object is sought, we look in this packfile first, because | |
64 | * objects that are looked up at similar times are often in the same | |
65 | * packfile as one another. | |
66 | */ | |
c01f51cc NTND |
67 | static struct packed_git *last_found_pack; |
68 | ||
c597ba80 NTND |
69 | static struct cached_object *find_cached_object(const unsigned char *sha1) |
70 | { | |
71 | int i; | |
72 | struct cached_object *co = cached_objects; | |
73 | ||
74 | for (i = 0; i < cached_object_nr; i++, co++) { | |
75 | if (!hashcmp(co->sha1, sha1)) | |
76 | return co; | |
77 | } | |
78 | if (!hashcmp(sha1, empty_tree.sha1)) | |
79 | return &empty_tree; | |
80 | return NULL; | |
81 | } | |
82 | ||
90a6464b JH |
83 | int mkdir_in_gitdir(const char *path) |
84 | { | |
85 | if (mkdir(path, 0777)) { | |
86 | int saved_errno = errno; | |
87 | struct stat st; | |
88 | struct strbuf sb = STRBUF_INIT; | |
89 | ||
90 | if (errno != EEXIST) | |
91 | return -1; | |
92 | /* | |
93 | * Are we looking at a path in a symlinked worktree | |
94 | * whose original repository does not yet have it? | |
95 | * e.g. .git/rr-cache pointing at its original | |
96 | * repository in which the user hasn't performed any | |
97 | * conflict resolution yet? | |
98 | */ | |
99 | if (lstat(path, &st) || !S_ISLNK(st.st_mode) || | |
100 | strbuf_readlink(&sb, path, st.st_size) || | |
101 | !is_absolute_path(sb.buf) || | |
102 | mkdir(sb.buf, 0777)) { | |
103 | strbuf_release(&sb); | |
104 | errno = saved_errno; | |
105 | return -1; | |
106 | } | |
107 | strbuf_release(&sb); | |
108 | } | |
109 | return adjust_shared_perm(path); | |
110 | } | |
111 | ||
0be0521b | 112 | enum scld_error safe_create_leading_directories(char *path) |
b2cb9425 | 113 | { |
26c8ae2a | 114 | char *next_component = path + offset_1st_component(path); |
0be0521b | 115 | enum scld_error ret = SCLD_OK; |
67d42212 | 116 | |
0be0521b | 117 | while (ret == SCLD_OK && next_component) { |
f0502332 | 118 | struct stat st; |
0f527403 | 119 | char *slash = next_component, slash_character; |
f0502332 | 120 | |
0f527403 MH |
121 | while (*slash && !is_dir_sep(*slash)) |
122 | slash++; | |
123 | ||
124 | if (!*slash) | |
b2cb9425 | 125 | break; |
bf10cf70 | 126 | |
26c8ae2a | 127 | next_component = slash + 1; |
0f527403 | 128 | while (is_dir_sep(*next_component)) |
bf10cf70 | 129 | next_component++; |
26c8ae2a | 130 | if (!*next_component) |
5f0bdf50 | 131 | break; |
831651fd | 132 | |
0f527403 | 133 | slash_character = *slash; |
831651fd | 134 | *slash = '\0'; |
67d42212 JR |
135 | if (!stat(path, &st)) { |
136 | /* path exists */ | |
9e6f885d | 137 | if (!S_ISDIR(st.st_mode)) |
0be0521b | 138 | ret = SCLD_EXISTS; |
53a39721 | 139 | } else if (mkdir(path, 0777)) { |
928734d9 | 140 | if (errno == EEXIST && |
9e6f885d | 141 | !stat(path, &st) && S_ISDIR(st.st_mode)) |
928734d9 | 142 | ; /* somebody created it since we checked */ |
18d37e86 MH |
143 | else if (errno == ENOENT) |
144 | /* | |
145 | * Either mkdir() failed because | |
146 | * somebody just pruned the containing | |
147 | * directory, or stat() failed because | |
148 | * the file that was in our way was | |
149 | * just removed. Either way, inform | |
150 | * the caller that it might be worth | |
151 | * trying again: | |
152 | */ | |
153 | ret = SCLD_VANISHED; | |
9e6f885d | 154 | else |
0be0521b | 155 | ret = SCLD_FAILED; |
53a39721 | 156 | } else if (adjust_shared_perm(path)) { |
0be0521b | 157 | ret = SCLD_PERMS; |
457f06d6 | 158 | } |
0f527403 | 159 | *slash = slash_character; |
b2cb9425 | 160 | } |
9e6f885d | 161 | return ret; |
b2cb9425 | 162 | } |
723c31fe | 163 | |
0be0521b | 164 | enum scld_error safe_create_leading_directories_const(const char *path) |
8e21d63b JK |
165 | { |
166 | /* path points to cache entries, so xstrdup before messing with it */ | |
167 | char *buf = xstrdup(path); | |
0be0521b | 168 | enum scld_error result = safe_create_leading_directories(buf); |
8e21d63b JK |
169 | free(buf); |
170 | return result; | |
171 | } | |
172 | ||
ace1534d JH |
173 | static void fill_sha1_path(char *pathbuf, const unsigned char *sha1) |
174 | { | |
175 | int i; | |
176 | for (i = 0; i < 20; i++) { | |
177 | static char hex[] = "0123456789abcdef"; | |
178 | unsigned int val = sha1[i]; | |
179 | char *pos = pathbuf + i*2 + (i > 0); | |
180 | *pos++ = hex[val >> 4]; | |
181 | *pos = hex[val & 0xf]; | |
182 | } | |
183 | } | |
184 | ||
30d6c6ea | 185 | const char *sha1_file_name(const unsigned char *sha1) |
0fcfd160 | 186 | { |
560fb6a1 JK |
187 | static char buf[PATH_MAX]; |
188 | const char *objdir; | |
189 | int len; | |
0fcfd160 | 190 | |
560fb6a1 JK |
191 | objdir = get_object_directory(); |
192 | len = strlen(objdir); | |
193 | ||
194 | /* '/' + sha1(2) + '/' + sha1(38) + '\0' */ | |
195 | if (len + 43 > PATH_MAX) | |
196 | die("insanely long object directory %s", objdir); | |
197 | memcpy(buf, objdir, len); | |
198 | buf[len] = '/'; | |
199 | buf[len+3] = '/'; | |
200 | buf[len+42] = '\0'; | |
201 | fill_sha1_path(buf + len + 1, sha1); | |
202 | return buf; | |
0fcfd160 LT |
203 | } |
204 | ||
d40d535b MH |
205 | /* |
206 | * Return the name of the pack or index file with the specified sha1 | |
207 | * in its filename. *base and *name are scratch space that must be | |
208 | * provided by the caller. which should be "pack" or "idx". | |
209 | */ | |
633f43e1 | 210 | static char *sha1_get_pack_name(const unsigned char *sha1, |
6eec46bd | 211 | char **name, char **base, const char *which) |
bf592c50 DB |
212 | { |
213 | static const char hex[] = "0123456789abcdef"; | |
633f43e1 | 214 | char *buf; |
bf592c50 DB |
215 | int i; |
216 | ||
633f43e1 | 217 | if (!*base) { |
bf592c50 DB |
218 | const char *sha1_file_directory = get_object_directory(); |
219 | int len = strlen(sha1_file_directory); | |
633f43e1 | 220 | *base = xmalloc(len + 60); |
6eec46bd JH |
221 | sprintf(*base, "%s/pack/pack-1234567890123456789012345678901234567890.%s", |
222 | sha1_file_directory, which); | |
633f43e1 | 223 | *name = *base + len + 11; |
bf592c50 DB |
224 | } |
225 | ||
633f43e1 | 226 | buf = *name; |
bf592c50 DB |
227 | |
228 | for (i = 0; i < 20; i++) { | |
229 | unsigned int val = *sha1++; | |
230 | *buf++ = hex[val >> 4]; | |
231 | *buf++ = hex[val & 0xf]; | |
232 | } | |
a6080a0a | 233 | |
633f43e1 | 234 | return *base; |
bf592c50 DB |
235 | } |
236 | ||
633f43e1 | 237 | char *sha1_pack_name(const unsigned char *sha1) |
bf592c50 | 238 | { |
633f43e1 | 239 | static char *name, *base; |
bf592c50 | 240 | |
6eec46bd | 241 | return sha1_get_pack_name(sha1, &name, &base, "pack"); |
633f43e1 | 242 | } |
bf592c50 | 243 | |
633f43e1 HO |
244 | char *sha1_pack_index_name(const unsigned char *sha1) |
245 | { | |
246 | static char *name, *base; | |
a6080a0a | 247 | |
6eec46bd | 248 | return sha1_get_pack_name(sha1, &name, &base, "idx"); |
bf592c50 DB |
249 | } |
250 | ||
d5a63b99 JH |
251 | struct alternate_object_database *alt_odb_list; |
252 | static struct alternate_object_database **alt_odb_tail; | |
ace1534d | 253 | |
ddd5d056 JH |
254 | /* |
255 | * Prepare alternate object database registry. | |
d5a63b99 JH |
256 | * |
257 | * The variable alt_odb_list points at the list of struct | |
258 | * alternate_object_database. The elements on this list come from | |
259 | * non-empty elements from colon separated ALTERNATE_DB_ENVIRONMENT | |
260 | * environment variable, and $GIT_OBJECT_DIRECTORY/info/alternates, | |
1494e038 JH |
261 | * whose contents is similar to that environment variable but can be |
262 | * LF separated. Its base points at a statically allocated buffer that | |
d5a63b99 JH |
263 | * contains "/the/directory/corresponding/to/.git/objects/...", while |
264 | * its name points just after the slash at the end of ".git/objects/" | |
265 | * in the example above, and has enough space to hold 40-byte hex | |
266 | * SHA1, an extra slash for the first level indirection, and the | |
267 | * terminating NUL. | |
ddd5d056 | 268 | */ |
539e7506 EK |
269 | static int link_alt_odb_entry(const char *entry, const char *relative_base, |
270 | int depth, const char *normalized_objdir) | |
ace1534d | 271 | { |
c2f493a4 MW |
272 | struct alternate_object_database *ent; |
273 | struct alternate_object_database *alt; | |
5bdf0a84 HW |
274 | int pfxlen, entlen; |
275 | struct strbuf pathbuf = STRBUF_INIT; | |
d5a63b99 | 276 | |
85dadc38 | 277 | if (!is_absolute_path(entry) && relative_base) { |
5bdf0a84 HW |
278 | strbuf_addstr(&pathbuf, real_path(relative_base)); |
279 | strbuf_addch(&pathbuf, '/'); | |
c2f493a4 | 280 | } |
6eac50d8 | 281 | strbuf_addstr(&pathbuf, entry); |
c2f493a4 | 282 | |
5bdf0a84 HW |
283 | normalize_path_copy(pathbuf.buf, pathbuf.buf); |
284 | ||
285 | pfxlen = strlen(pathbuf.buf); | |
286 | ||
287 | /* | |
288 | * The trailing slash after the directory name is given by | |
289 | * this function at the end. Remove duplicates. | |
290 | */ | |
291 | while (pfxlen && pathbuf.buf[pfxlen-1] == '/') | |
292 | pfxlen -= 1; | |
293 | ||
294 | entlen = pfxlen + 43; /* '/' + 2 hex + '/' + 38 hex + NUL */ | |
295 | ent = xmalloc(sizeof(*ent) + entlen); | |
296 | memcpy(ent->base, pathbuf.buf, pfxlen); | |
297 | strbuf_release(&pathbuf); | |
c2f493a4 MW |
298 | |
299 | ent->name = ent->base + pfxlen + 1; | |
300 | ent->base[pfxlen + 3] = '/'; | |
301 | ent->base[pfxlen] = ent->base[entlen-1] = 0; | |
302 | ||
303 | /* Detect cases where alternate disappeared */ | |
90b4a71c | 304 | if (!is_directory(ent->base)) { |
c2f493a4 MW |
305 | error("object directory %s does not exist; " |
306 | "check .git/objects/info/alternates.", | |
307 | ent->base); | |
308 | free(ent); | |
309 | return -1; | |
310 | } | |
311 | ||
312 | /* Prevent the common mistake of listing the same | |
313 | * thing twice, or object directory itself. | |
314 | */ | |
315 | for (alt = alt_odb_list; alt; alt = alt->next) { | |
80b47854 RS |
316 | if (pfxlen == alt->name - alt->base - 1 && |
317 | !memcmp(ent->base, alt->base, pfxlen)) { | |
c2f493a4 MW |
318 | free(ent); |
319 | return -1; | |
320 | } | |
321 | } | |
539e7506 | 322 | if (!strcmp_icase(ent->base, normalized_objdir)) { |
c2f493a4 MW |
323 | free(ent); |
324 | return -1; | |
325 | } | |
326 | ||
327 | /* add the alternate entry */ | |
328 | *alt_odb_tail = ent; | |
329 | alt_odb_tail = &(ent->next); | |
330 | ent->next = NULL; | |
331 | ||
332 | /* recursively add alternates */ | |
333 | read_info_alternates(ent->base, depth + 1); | |
334 | ||
335 | ent->base[pfxlen] = '/'; | |
336 | ||
337 | return 0; | |
338 | } | |
339 | ||
c5950164 | 340 | static void link_alt_odb_entries(const char *alt, int len, int sep, |
c2f493a4 MW |
341 | const char *relative_base, int depth) |
342 | { | |
6eac50d8 MH |
343 | struct string_list entries = STRING_LIST_INIT_NODUP; |
344 | char *alt_copy; | |
345 | int i; | |
539e7506 | 346 | struct strbuf objdirbuf = STRBUF_INIT; |
c2f493a4 MW |
347 | |
348 | if (depth > 5) { | |
349 | error("%s: ignoring alternate object stores, nesting too deep.", | |
350 | relative_base); | |
351 | return; | |
352 | } | |
353 | ||
f655651e | 354 | strbuf_add_absolute_path(&objdirbuf, get_object_directory()); |
539e7506 EK |
355 | normalize_path_copy(objdirbuf.buf, objdirbuf.buf); |
356 | ||
c5950164 | 357 | alt_copy = xmemdupz(alt, len); |
6eac50d8 MH |
358 | string_list_split_in_place(&entries, alt_copy, sep, -1); |
359 | for (i = 0; i < entries.nr; i++) { | |
360 | const char *entry = entries.items[i].string; | |
361 | if (entry[0] == '\0' || entry[0] == '#') | |
9577e7e3 | 362 | continue; |
6eac50d8 MH |
363 | if (!is_absolute_path(entry) && depth) { |
364 | error("%s: ignoring relative alternate object store %s", | |
365 | relative_base, entry); | |
366 | } else { | |
539e7506 | 367 | link_alt_odb_entry(entry, relative_base, depth, objdirbuf.buf); |
9577e7e3 | 368 | } |
9577e7e3 | 369 | } |
6eac50d8 MH |
370 | string_list_clear(&entries, 0); |
371 | free(alt_copy); | |
539e7506 | 372 | strbuf_release(&objdirbuf); |
d5a63b99 JH |
373 | } |
374 | ||
5e73633d | 375 | void read_info_alternates(const char * relative_base, int depth) |
d5a63b99 | 376 | { |
9577e7e3 | 377 | char *map; |
dc49cd76 | 378 | size_t mapsz; |
d5a63b99 | 379 | struct stat st; |
9cb18f56 JM |
380 | const char alt_file_name[] = "info/alternates"; |
381 | /* Given that relative_base is no longer than PATH_MAX, | |
382 | ensure that "path" has enough space to append "/", the | |
383 | file name, "info/alternates", and a trailing NUL. */ | |
384 | char path[PATH_MAX + 1 + sizeof alt_file_name]; | |
c2f493a4 | 385 | int fd; |
d5a63b99 | 386 | |
9cb18f56 | 387 | sprintf(path, "%s/%s", relative_base, alt_file_name); |
f4e51683 | 388 | fd = git_open_noatime(path); |
d5a63b99 JH |
389 | if (fd < 0) |
390 | return; | |
391 | if (fstat(fd, &st) || (st.st_size == 0)) { | |
392 | close(fd); | |
9a217f2a | 393 | return; |
ace1534d | 394 | } |
dc49cd76 SP |
395 | mapsz = xsize_t(st.st_size); |
396 | map = xmmap(NULL, mapsz, PROT_READ, MAP_PRIVATE, fd, 0); | |
d5a63b99 | 397 | close(fd); |
d5a63b99 | 398 | |
c5950164 | 399 | link_alt_odb_entries(map, mapsz, '\n', relative_base, depth); |
c2f493a4 | 400 | |
dc49cd76 | 401 | munmap(map, mapsz); |
ace1534d JH |
402 | } |
403 | ||
bef70b22 DB |
404 | void add_to_alternates_file(const char *reference) |
405 | { | |
406 | struct lock_file *lock = xcalloc(1, sizeof(struct lock_file)); | |
acd3b9ec | 407 | int fd = hold_lock_file_for_append(lock, git_path("objects/info/alternates"), LOCK_DIE_ON_ERROR); |
e6baf4a1 | 408 | char *alt = mkpath("%s\n", reference); |
bef70b22 DB |
409 | write_or_die(fd, alt, strlen(alt)); |
410 | if (commit_lock_file(lock)) | |
411 | die("could not close alternates file"); | |
412 | if (alt_odb_tail) | |
c5950164 | 413 | link_alt_odb_entries(alt, strlen(alt), '\n', NULL, 0); |
bef70b22 DB |
414 | } |
415 | ||
fe1b2268 | 416 | int foreach_alt_odb(alt_odb_fn fn, void *cb) |
d79796bc JH |
417 | { |
418 | struct alternate_object_database *ent; | |
fe1b2268 | 419 | int r = 0; |
d79796bc JH |
420 | |
421 | prepare_alt_odb(); | |
fe1b2268 JK |
422 | for (ent = alt_odb_list; ent; ent = ent->next) { |
423 | r = fn(ent, cb); | |
424 | if (r) | |
425 | break; | |
426 | } | |
427 | return r; | |
d79796bc JH |
428 | } |
429 | ||
c2f493a4 MW |
430 | void prepare_alt_odb(void) |
431 | { | |
554fe20d | 432 | const char *alt; |
c2f493a4 | 433 | |
7dc24aa5 SP |
434 | if (alt_odb_tail) |
435 | return; | |
436 | ||
c2f493a4 MW |
437 | alt = getenv(ALTERNATE_DB_ENVIRONMENT); |
438 | if (!alt) alt = ""; | |
439 | ||
c2f493a4 | 440 | alt_odb_tail = &alt_odb_list; |
c5950164 | 441 | link_alt_odb_entries(alt, strlen(alt), PATH_SEP, NULL, 0); |
c2f493a4 MW |
442 | |
443 | read_info_alternates(get_object_directory(), 0); | |
444 | } | |
445 | ||
3096b2ec | 446 | /* Returns 1 if we have successfully freshened the file, 0 otherwise. */ |
33d4221c | 447 | static int freshen_file(const char *fn) |
ace1534d | 448 | { |
33d4221c JK |
449 | struct utimbuf t; |
450 | t.actime = t.modtime = time(NULL); | |
451 | return !utime(fn, &t); | |
0f4dc14a | 452 | } |
ace1534d | 453 | |
3096b2ec JK |
454 | /* |
455 | * All of the check_and_freshen functions return 1 if the file exists and was | |
456 | * freshened (if freshening was requested), 0 otherwise. If they return | |
457 | * 0, you should not assume that it is safe to skip a write of the object (it | |
458 | * either does not exist on disk, or has a stale mtime and may be subject to | |
459 | * pruning). | |
460 | */ | |
33d4221c JK |
461 | static int check_and_freshen_file(const char *fn, int freshen) |
462 | { | |
463 | if (access(fn, F_OK)) | |
464 | return 0; | |
3096b2ec | 465 | if (freshen && !freshen_file(fn)) |
33d4221c JK |
466 | return 0; |
467 | return 1; | |
468 | } | |
469 | ||
470 | static int check_and_freshen_local(const unsigned char *sha1, int freshen) | |
471 | { | |
472 | return check_and_freshen_file(sha1_file_name(sha1), freshen); | |
473 | } | |
474 | ||
475 | static int check_and_freshen_nonlocal(const unsigned char *sha1, int freshen) | |
0f4dc14a BC |
476 | { |
477 | struct alternate_object_database *alt; | |
9a217f2a | 478 | prepare_alt_odb(); |
d5a63b99 | 479 | for (alt = alt_odb_list; alt; alt = alt->next) { |
0f4dc14a | 480 | fill_sha1_path(alt->name, sha1); |
33d4221c | 481 | if (check_and_freshen_file(alt->base, freshen)) |
c529d75a | 482 | return 1; |
ace1534d | 483 | } |
c529d75a | 484 | return 0; |
ace1534d JH |
485 | } |
486 | ||
33d4221c JK |
487 | static int check_and_freshen(const unsigned char *sha1, int freshen) |
488 | { | |
489 | return check_and_freshen_local(sha1, freshen) || | |
490 | check_and_freshen_nonlocal(sha1, freshen); | |
491 | } | |
492 | ||
493 | int has_loose_object_nonlocal(const unsigned char *sha1) | |
494 | { | |
495 | return check_and_freshen_nonlocal(sha1, 0); | |
496 | } | |
497 | ||
0f4dc14a BC |
498 | static int has_loose_object(const unsigned char *sha1) |
499 | { | |
33d4221c | 500 | return check_and_freshen(sha1, 0); |
0f4dc14a BC |
501 | } |
502 | ||
60bb8b14 | 503 | static unsigned int pack_used_ctr; |
a53128b6 SP |
504 | static unsigned int pack_mmap_calls; |
505 | static unsigned int peak_pack_open_windows; | |
506 | static unsigned int pack_open_windows; | |
c7934306 SP |
507 | static unsigned int pack_open_fds; |
508 | static unsigned int pack_max_fds; | |
a53128b6 | 509 | static size_t peak_pack_mapped; |
60bb8b14 | 510 | static size_t pack_mapped; |
9a217f2a | 511 | struct packed_git *packed_git; |
1f688557 | 512 | |
b79d18c9 | 513 | void pack_report(void) |
a53128b6 SP |
514 | { |
515 | fprintf(stderr, | |
e05db0fd PR |
516 | "pack_report: getpagesize() = %10" SZ_FMT "\n" |
517 | "pack_report: core.packedGitWindowSize = %10" SZ_FMT "\n" | |
518 | "pack_report: core.packedGitLimit = %10" SZ_FMT "\n", | |
9e42d6a1 SP |
519 | sz_fmt(getpagesize()), |
520 | sz_fmt(packed_git_window_size), | |
521 | sz_fmt(packed_git_limit)); | |
a53128b6 SP |
522 | fprintf(stderr, |
523 | "pack_report: pack_used_ctr = %10u\n" | |
524 | "pack_report: pack_mmap_calls = %10u\n" | |
525 | "pack_report: pack_open_windows = %10u / %10u\n" | |
e05db0fd PR |
526 | "pack_report: pack_mapped = " |
527 | "%10" SZ_FMT " / %10" SZ_FMT "\n", | |
a53128b6 SP |
528 | pack_used_ctr, |
529 | pack_mmap_calls, | |
530 | pack_open_windows, peak_pack_open_windows, | |
9e42d6a1 | 531 | sz_fmt(pack_mapped), sz_fmt(peak_pack_mapped)); |
a53128b6 SP |
532 | } |
533 | ||
d40d535b MH |
534 | /* |
535 | * Open and mmap the index file at path, perform a couple of | |
536 | * consistency checks, then record its information to p. Return 0 on | |
537 | * success. | |
538 | */ | |
539 | static int check_packed_git_idx(const char *path, struct packed_git *p) | |
1f688557 JH |
540 | { |
541 | void *idx_map; | |
42873078 | 542 | struct pack_idx_header *hdr; |
dc49cd76 | 543 | size_t idx_size; |
74e34e1f | 544 | uint32_t version, nr, i, *index; |
f4e51683 | 545 | int fd = git_open_noatime(path); |
1f688557 | 546 | struct stat st; |
42873078 | 547 | |
1f688557 JH |
548 | if (fd < 0) |
549 | return -1; | |
550 | if (fstat(fd, &st)) { | |
551 | close(fd); | |
552 | return -1; | |
553 | } | |
dc49cd76 | 554 | idx_size = xsize_t(st.st_size); |
2d88451b SP |
555 | if (idx_size < 4 * 256 + 20 + 20) { |
556 | close(fd); | |
557 | return error("index file %s is too small", path); | |
558 | } | |
c4712e45 | 559 | idx_map = xmmap(NULL, idx_size, PROT_READ, MAP_PRIVATE, fd, 0); |
1f688557 | 560 | close(fd); |
1f688557 | 561 | |
42873078 NP |
562 | hdr = idx_map; |
563 | if (hdr->idx_signature == htonl(PACK_IDX_SIGNATURE)) { | |
74e34e1f NP |
564 | version = ntohl(hdr->idx_version); |
565 | if (version < 2 || version > 2) { | |
566 | munmap(idx_map, idx_size); | |
6e1c2344 | 567 | return error("index file %s is version %"PRIu32 |
74e34e1f NP |
568 | " and is not supported by this binary" |
569 | " (try upgrading GIT to a newer version)", | |
570 | path, version); | |
571 | } | |
572 | } else | |
573 | version = 1; | |
df1b059d | 574 | |
1f688557 | 575 | nr = 0; |
42873078 | 576 | index = idx_map; |
74e34e1f NP |
577 | if (version > 1) |
578 | index += 2; /* skip index header */ | |
1f688557 | 579 | for (i = 0; i < 256; i++) { |
326bf396 | 580 | uint32_t n = ntohl(index[i]); |
2d88451b SP |
581 | if (n < nr) { |
582 | munmap(idx_map, idx_size); | |
df1b059d | 583 | return error("non-monotonic index %s", path); |
2d88451b | 584 | } |
1f688557 JH |
585 | nr = n; |
586 | } | |
587 | ||
74e34e1f NP |
588 | if (version == 1) { |
589 | /* | |
590 | * Total size: | |
591 | * - 256 index entries 4 bytes each | |
592 | * - 24-byte entries * nr (20-byte sha1 + 4-byte offset) | |
593 | * - 20-byte SHA1 of the packfile | |
594 | * - 20-byte SHA1 file checksum | |
595 | */ | |
596 | if (idx_size != 4*256 + nr * 24 + 20 + 20) { | |
597 | munmap(idx_map, idx_size); | |
eef427a0 | 598 | return error("wrong index v1 file size in %s", path); |
74e34e1f NP |
599 | } |
600 | } else if (version == 2) { | |
601 | /* | |
602 | * Minimum size: | |
603 | * - 8 bytes of header | |
604 | * - 256 index entries 4 bytes each | |
605 | * - 20-byte sha1 entry * nr | |
606 | * - 4-byte crc entry * nr | |
607 | * - 4-byte offset entry * nr | |
608 | * - 20-byte SHA1 of the packfile | |
609 | * - 20-byte SHA1 file checksum | |
610 | * And after the 4-byte offset table might be a | |
611 | * variable sized table containing 8-byte entries | |
612 | * for offsets larger than 2^31. | |
613 | */ | |
614 | unsigned long min_size = 8 + 4*256 + nr*(20 + 4 + 4) + 20 + 20; | |
1164f1e4 LT |
615 | unsigned long max_size = min_size; |
616 | if (nr) | |
617 | max_size += (nr - 1)*8; | |
618 | if (idx_size < min_size || idx_size > max_size) { | |
74e34e1f | 619 | munmap(idx_map, idx_size); |
eef427a0 | 620 | return error("wrong index v2 file size in %s", path); |
74e34e1f | 621 | } |
7109c889 JH |
622 | if (idx_size != min_size && |
623 | /* | |
624 | * make sure we can deal with large pack offsets. | |
625 | * 31-bit signed offset won't be enough, neither | |
626 | * 32-bit unsigned one will be. | |
627 | */ | |
628 | (sizeof(off_t) <= 4)) { | |
629 | munmap(idx_map, idx_size); | |
630 | return error("pack too large for current definition of off_t in %s", path); | |
74e34e1f | 631 | } |
2d88451b | 632 | } |
1f688557 | 633 | |
74e34e1f | 634 | p->index_version = version; |
42873078 NP |
635 | p->index_data = idx_map; |
636 | p->index_size = idx_size; | |
57059091 | 637 | p->num_objects = nr; |
1f688557 JH |
638 | return 0; |
639 | } | |
640 | ||
bc8e478a | 641 | int open_pack_index(struct packed_git *p) |
d079837e SP |
642 | { |
643 | char *idx_name; | |
644 | int ret; | |
645 | ||
646 | if (p->index_data) | |
647 | return 0; | |
648 | ||
649 | idx_name = xstrdup(p->pack_name); | |
650 | strcpy(idx_name + strlen(idx_name) - strlen(".pack"), ".idx"); | |
651 | ret = check_packed_git_idx(idx_name, p); | |
652 | free(idx_name); | |
653 | return ret; | |
654 | } | |
655 | ||
11daf39b SP |
656 | static void scan_windows(struct packed_git *p, |
657 | struct packed_git **lru_p, | |
658 | struct pack_window **lru_w, | |
659 | struct pack_window **lru_l) | |
1f688557 | 660 | { |
11daf39b SP |
661 | struct pack_window *w, *w_l; |
662 | ||
663 | for (w_l = NULL, w = p->windows; w; w = w->next) { | |
664 | if (!w->inuse_cnt) { | |
665 | if (!*lru_w || w->last_used < (*lru_w)->last_used) { | |
666 | *lru_p = p; | |
667 | *lru_w = w; | |
668 | *lru_l = w_l; | |
54044bf8 | 669 | } |
54044bf8 | 670 | } |
11daf39b | 671 | w_l = w; |
f9253394 | 672 | } |
11daf39b SP |
673 | } |
674 | ||
7c3ecb32 | 675 | static int unuse_one_window(struct packed_git *current) |
11daf39b SP |
676 | { |
677 | struct packed_git *p, *lru_p = NULL; | |
678 | struct pack_window *lru_w = NULL, *lru_l = NULL; | |
679 | ||
680 | if (current) | |
681 | scan_windows(current, &lru_p, &lru_w, &lru_l); | |
682 | for (p = packed_git; p; p = p->next) | |
683 | scan_windows(p, &lru_p, &lru_w, &lru_l); | |
54044bf8 SP |
684 | if (lru_p) { |
685 | munmap(lru_w->base, lru_w->len); | |
686 | pack_mapped -= lru_w->len; | |
687 | if (lru_l) | |
688 | lru_l->next = lru_w->next; | |
7c3ecb32 | 689 | else |
54044bf8 | 690 | lru_p->windows = lru_w->next; |
54044bf8 | 691 | free(lru_w); |
a53128b6 | 692 | pack_open_windows--; |
54044bf8 SP |
693 | return 1; |
694 | } | |
695 | return 0; | |
f9253394 JH |
696 | } |
697 | ||
7c3ecb32 | 698 | void release_pack_memory(size_t need) |
97bfeb34 SP |
699 | { |
700 | size_t cur = pack_mapped; | |
7c3ecb32 | 701 | while (need >= (cur - pack_mapped) && unuse_one_window(NULL)) |
97bfeb34 SP |
702 | ; /* nothing */ |
703 | } | |
704 | ||
02710228 SP |
705 | static void mmap_limit_check(size_t length) |
706 | { | |
707 | static size_t limit = 0; | |
708 | if (!limit) { | |
709 | limit = git_env_ulong("GIT_MMAP_LIMIT", 0); | |
710 | if (!limit) | |
711 | limit = SIZE_MAX; | |
712 | } | |
713 | if (length > limit) | |
714 | die("attempting to mmap %"PRIuMAX" over limit %"PRIuMAX, | |
715 | (uintmax_t)length, (uintmax_t)limit); | |
716 | } | |
717 | ||
1570856b JK |
718 | void *xmmap_gently(void *start, size_t length, |
719 | int prot, int flags, int fd, off_t offset) | |
58ecbd5e | 720 | { |
02710228 SP |
721 | void *ret; |
722 | ||
723 | mmap_limit_check(length); | |
724 | ret = mmap(start, length, prot, flags, fd, offset); | |
58ecbd5e JN |
725 | if (ret == MAP_FAILED) { |
726 | if (!length) | |
727 | return NULL; | |
7c3ecb32 | 728 | release_pack_memory(length); |
58ecbd5e | 729 | ret = mmap(start, length, prot, flags, fd, offset); |
58ecbd5e JN |
730 | } |
731 | return ret; | |
732 | } | |
733 | ||
1570856b JK |
734 | void *xmmap(void *start, size_t length, |
735 | int prot, int flags, int fd, off_t offset) | |
736 | { | |
737 | void *ret = xmmap_gently(start, length, prot, flags, fd, offset); | |
738 | if (ret == MAP_FAILED) | |
9ca0aaf6 | 739 | die_errno("mmap failed"); |
1570856b JK |
740 | return ret; |
741 | } | |
742 | ||
c9ced051 SP |
743 | void close_pack_windows(struct packed_git *p) |
744 | { | |
745 | while (p->windows) { | |
746 | struct pack_window *w = p->windows; | |
747 | ||
748 | if (w->inuse_cnt) | |
749 | die("pack '%s' still has open windows to it", | |
750 | p->pack_name); | |
751 | munmap(w->base, w->len); | |
752 | pack_mapped -= w->len; | |
753 | pack_open_windows--; | |
754 | p->windows = w->next; | |
755 | free(w); | |
756 | } | |
757 | } | |
758 | ||
88d0db55 BC |
759 | /* |
760 | * The LRU pack is the one with the oldest MRU window, preferring packs | |
761 | * with no used windows, or the oldest mtime if it has no windows allocated. | |
762 | */ | |
763 | static void find_lru_pack(struct packed_git *p, struct packed_git **lru_p, struct pack_window **mru_w, int *accept_windows_inuse) | |
764 | { | |
765 | struct pack_window *w, *this_mru_w; | |
766 | int has_windows_inuse = 0; | |
767 | ||
768 | /* | |
769 | * Reject this pack if it has windows and the previously selected | |
770 | * one does not. If this pack does not have windows, reject | |
771 | * it if the pack file is newer than the previously selected one. | |
772 | */ | |
773 | if (*lru_p && !*mru_w && (p->windows || p->mtime > (*lru_p)->mtime)) | |
774 | return; | |
775 | ||
776 | for (w = this_mru_w = p->windows; w; w = w->next) { | |
777 | /* | |
778 | * Reject this pack if any of its windows are in use, | |
779 | * but the previously selected pack did not have any | |
780 | * inuse windows. Otherwise, record that this pack | |
781 | * has windows in use. | |
782 | */ | |
783 | if (w->inuse_cnt) { | |
784 | if (*accept_windows_inuse) | |
785 | has_windows_inuse = 1; | |
786 | else | |
787 | return; | |
788 | } | |
789 | ||
790 | if (w->last_used > this_mru_w->last_used) | |
791 | this_mru_w = w; | |
792 | ||
793 | /* | |
794 | * Reject this pack if it has windows that have been | |
795 | * used more recently than the previously selected pack. | |
796 | * If the previously selected pack had windows inuse and | |
797 | * we have not encountered a window in this pack that is | |
798 | * inuse, skip this check since we prefer a pack with no | |
799 | * inuse windows to one that has inuse windows. | |
800 | */ | |
801 | if (*mru_w && *accept_windows_inuse == has_windows_inuse && | |
802 | this_mru_w->last_used > (*mru_w)->last_used) | |
803 | return; | |
804 | } | |
805 | ||
806 | /* | |
807 | * Select this pack. | |
808 | */ | |
809 | *mru_w = this_mru_w; | |
810 | *lru_p = p; | |
811 | *accept_windows_inuse = has_windows_inuse; | |
812 | } | |
813 | ||
814 | static int close_one_pack(void) | |
815 | { | |
816 | struct packed_git *p, *lru_p = NULL; | |
817 | struct pack_window *mru_w = NULL; | |
818 | int accept_windows_inuse = 1; | |
819 | ||
820 | for (p = packed_git; p; p = p->next) { | |
821 | if (p->pack_fd == -1) | |
822 | continue; | |
823 | find_lru_pack(p, &lru_p, &mru_w, &accept_windows_inuse); | |
824 | } | |
825 | ||
826 | if (lru_p) { | |
827 | close(lru_p->pack_fd); | |
828 | pack_open_fds--; | |
829 | lru_p->pack_fd = -1; | |
830 | return 1; | |
831 | } | |
832 | ||
833 | return 0; | |
834 | } | |
835 | ||
03e79c88 | 836 | void unuse_pack(struct pack_window **w_cursor) |
f9253394 | 837 | { |
03e79c88 SP |
838 | struct pack_window *w = *w_cursor; |
839 | if (w) { | |
840 | w->inuse_cnt--; | |
841 | *w_cursor = NULL; | |
842 | } | |
1f688557 JH |
843 | } |
844 | ||
fa5fc15d SP |
845 | void close_pack_index(struct packed_git *p) |
846 | { | |
847 | if (p->index_data) { | |
848 | munmap((void *)p->index_data, p->index_size); | |
849 | p->index_data = NULL; | |
850 | } | |
851 | } | |
852 | ||
c74faea1 NP |
853 | /* |
854 | * This is used by git-repack in case a newly created pack happens to | |
855 | * contain the same set of objects as an existing one. In that case | |
856 | * the resulting file might be different even if its name would be the | |
857 | * same. It is best to close any reference to the old pack before it is | |
01689909 | 858 | * replaced on disk. Of course no index pointers or windows for given pack |
c74faea1 NP |
859 | * must subsist at this point. If ever objects from this pack are requested |
860 | * again, the new version of the pack will be reinitialized through | |
861 | * reprepare_packed_git(). | |
862 | */ | |
863 | void free_pack_by_name(const char *pack_name) | |
864 | { | |
865 | struct packed_git *p, **pp = &packed_git; | |
866 | ||
867 | while (*pp) { | |
868 | p = *pp; | |
869 | if (strcmp(pack_name, p->pack_name) == 0) { | |
fa3a0c94 | 870 | clear_delta_base_cache(); |
c74faea1 | 871 | close_pack_windows(p); |
c7934306 | 872 | if (p->pack_fd != -1) { |
c74faea1 | 873 | close(p->pack_fd); |
c7934306 SP |
874 | pack_open_fds--; |
875 | } | |
fa5fc15d | 876 | close_pack_index(p); |
c74faea1 NP |
877 | free(p->bad_object_sha1); |
878 | *pp = p->next; | |
c01f51cc NTND |
879 | if (last_found_pack == p) |
880 | last_found_pack = NULL; | |
c74faea1 NP |
881 | free(p); |
882 | return; | |
883 | } | |
884 | pp = &p->next; | |
885 | } | |
886 | } | |
887 | ||
a0788266 JS |
888 | static unsigned int get_max_fd_limit(void) |
889 | { | |
890 | #ifdef RLIMIT_NOFILE | |
491a8dec JH |
891 | { |
892 | struct rlimit lim; | |
a0788266 | 893 | |
491a8dec JH |
894 | if (!getrlimit(RLIMIT_NOFILE, &lim)) |
895 | return lim.rlim_cur; | |
896 | } | |
897 | #endif | |
898 | ||
899 | #ifdef _SC_OPEN_MAX | |
900 | { | |
901 | long open_max = sysconf(_SC_OPEN_MAX); | |
902 | if (0 < open_max) | |
903 | return open_max; | |
904 | /* | |
905 | * Otherwise, we got -1 for one of the two | |
906 | * reasons: | |
907 | * | |
908 | * (1) sysconf() did not understand _SC_OPEN_MAX | |
909 | * and signaled an error with -1; or | |
910 | * (2) sysconf() said there is no limit. | |
911 | * | |
912 | * We _could_ clear errno before calling sysconf() to | |
913 | * tell these two cases apart and return a huge number | |
914 | * in the latter case to let the caller cap it to a | |
915 | * value that is not so selfish, but letting the | |
916 | * fallback OPEN_MAX codepath take care of these cases | |
917 | * is a lot simpler. | |
918 | */ | |
919 | } | |
920 | #endif | |
a0788266 | 921 | |
491a8dec | 922 | #ifdef OPEN_MAX |
a0788266 JS |
923 | return OPEN_MAX; |
924 | #else | |
925 | return 1; /* see the caller ;-) */ | |
926 | #endif | |
927 | } | |
928 | ||
3cf8b462 SP |
929 | /* |
930 | * Do not call this directly as this leaks p->pack_fd on error return; | |
931 | * call open_packed_git() instead. | |
932 | */ | |
933 | static int open_packed_git_1(struct packed_git *p) | |
1f688557 | 934 | { |
9bc879c1 SP |
935 | struct stat st; |
936 | struct pack_header hdr; | |
937 | unsigned char sha1[20]; | |
938 | unsigned char *idx_sha1; | |
2c039da8 | 939 | long fd_flag; |
9bc879c1 | 940 | |
d079837e SP |
941 | if (!p->index_data && open_pack_index(p)) |
942 | return error("packfile %s index unavailable", p->pack_name); | |
943 | ||
c7934306 | 944 | if (!pack_max_fds) { |
a0788266 | 945 | unsigned int max_fds = get_max_fd_limit(); |
c7934306 SP |
946 | |
947 | /* Save 3 for stdin/stdout/stderr, 22 for work */ | |
948 | if (25 < max_fds) | |
949 | pack_max_fds = max_fds - 25; | |
950 | else | |
951 | pack_max_fds = 1; | |
952 | } | |
953 | ||
88d0db55 | 954 | while (pack_max_fds <= pack_open_fds && close_one_pack()) |
c7934306 SP |
955 | ; /* nothing */ |
956 | ||
f4e51683 | 957 | p->pack_fd = git_open_noatime(p->pack_name); |
9bc879c1 | 958 | if (p->pack_fd < 0 || fstat(p->pack_fd, &st)) |
072db278 | 959 | return -1; |
c7934306 | 960 | pack_open_fds++; |
9bc879c1 SP |
961 | |
962 | /* If we created the struct before we had the pack we lack size. */ | |
bf592c50 | 963 | if (!p->pack_size) { |
bf592c50 | 964 | if (!S_ISREG(st.st_mode)) |
072db278 | 965 | return error("packfile %s not a regular file", p->pack_name); |
bf592c50 | 966 | p->pack_size = st.st_size; |
9bc879c1 | 967 | } else if (p->pack_size != st.st_size) |
072db278 | 968 | return error("packfile %s size changed", p->pack_name); |
9bc879c1 | 969 | |
2c039da8 JH |
970 | /* We leave these file descriptors open with sliding mmap; |
971 | * there is no point keeping them open across exec(), though. | |
972 | */ | |
973 | fd_flag = fcntl(p->pack_fd, F_GETFD, 0); | |
974 | if (fd_flag < 0) | |
072db278 | 975 | return error("cannot determine file descriptor flags"); |
2c039da8 JH |
976 | fd_flag |= FD_CLOEXEC; |
977 | if (fcntl(p->pack_fd, F_SETFD, fd_flag) == -1) | |
072db278 | 978 | return error("cannot set FD_CLOEXEC"); |
2c039da8 | 979 | |
9bc879c1 | 980 | /* Verify we recognize this pack file format. */ |
e6e2bd62 | 981 | if (read_in_full(p->pack_fd, &hdr, sizeof(hdr)) != sizeof(hdr)) |
072db278 | 982 | return error("file %s is far too short to be a packfile", p->pack_name); |
9bc879c1 | 983 | if (hdr.hdr_signature != htonl(PACK_SIGNATURE)) |
072db278 | 984 | return error("file %s is not a GIT packfile", p->pack_name); |
9bc879c1 | 985 | if (!pack_version_ok(hdr.hdr_version)) |
6e1c2344 RJ |
986 | return error("packfile %s is version %"PRIu32" and not" |
987 | " supported (try upgrading GIT to a newer version)", | |
9bc879c1 SP |
988 | p->pack_name, ntohl(hdr.hdr_version)); |
989 | ||
990 | /* Verify the pack matches its index. */ | |
57059091 | 991 | if (p->num_objects != ntohl(hdr.hdr_entries)) |
6e1c2344 RJ |
992 | return error("packfile %s claims to have %"PRIu32" objects" |
993 | " while index indicates %"PRIu32" objects", | |
57059091 NP |
994 | p->pack_name, ntohl(hdr.hdr_entries), |
995 | p->num_objects); | |
9bc879c1 | 996 | if (lseek(p->pack_fd, p->pack_size - sizeof(sha1), SEEK_SET) == -1) |
072db278 | 997 | return error("end of packfile %s is unavailable", p->pack_name); |
e6e2bd62 | 998 | if (read_in_full(p->pack_fd, sha1, sizeof(sha1)) != sizeof(sha1)) |
072db278 | 999 | return error("packfile %s signature is unavailable", p->pack_name); |
42873078 | 1000 | idx_sha1 = ((unsigned char *)p->index_data) + p->index_size - 40; |
9bc879c1 | 1001 | if (hashcmp(sha1, idx_sha1)) |
072db278 SP |
1002 | return error("packfile %s does not match index", p->pack_name); |
1003 | return 0; | |
9bc879c1 SP |
1004 | } |
1005 | ||
3cf8b462 SP |
1006 | static int open_packed_git(struct packed_git *p) |
1007 | { | |
1008 | if (!open_packed_git_1(p)) | |
1009 | return 0; | |
1010 | if (p->pack_fd != -1) { | |
1011 | close(p->pack_fd); | |
c7934306 | 1012 | pack_open_fds--; |
3cf8b462 SP |
1013 | p->pack_fd = -1; |
1014 | } | |
1015 | return -1; | |
1016 | } | |
1017 | ||
c4001d92 | 1018 | static int in_window(struct pack_window *win, off_t offset) |
60bb8b14 SP |
1019 | { |
1020 | /* We must promise at least 20 bytes (one hash) after the | |
1021 | * offset is available from this window, otherwise the offset | |
1022 | * is not actually in this window and a different window (which | |
1023 | * has that one hash excess) must be used. This is to support | |
1024 | * the object header and delta base parsing routines below. | |
1025 | */ | |
1026 | off_t win_off = win->offset; | |
1027 | return win_off <= offset | |
1028 | && (offset + 20) <= (win_off + win->len); | |
1029 | } | |
1030 | ||
4b25d091 | 1031 | unsigned char *use_pack(struct packed_git *p, |
03e79c88 | 1032 | struct pack_window **w_cursor, |
c4001d92 | 1033 | off_t offset, |
ef49a7a0 | 1034 | unsigned long *left) |
9bc879c1 | 1035 | { |
60bb8b14 | 1036 | struct pack_window *win = *w_cursor; |
03e79c88 | 1037 | |
a9d98a14 | 1038 | /* Since packfiles end in a hash of their content and it's |
60bb8b14 SP |
1039 | * pointless to ask for an offset into the middle of that |
1040 | * hash, and the in_window function above wouldn't match | |
1041 | * don't allow an offset too close to the end of the file. | |
1042 | */ | |
d131b7af SP |
1043 | if (!p->pack_size && p->pack_fd == -1 && open_packed_git(p)) |
1044 | die("packfile %s cannot be accessed", p->pack_name); | |
60bb8b14 SP |
1045 | if (offset > (p->pack_size - 20)) |
1046 | die("offset beyond end of packfile (truncated pack?)"); | |
1047 | ||
1048 | if (!win || !in_window(win, offset)) { | |
1049 | if (win) | |
1050 | win->inuse_cnt--; | |
1051 | for (win = p->windows; win; win = win->next) { | |
1052 | if (in_window(win, offset)) | |
1053 | break; | |
1054 | } | |
1055 | if (!win) { | |
78a28df9 | 1056 | size_t window_align = packed_git_window_size / 2; |
dc49cd76 | 1057 | off_t len; |
d131b7af SP |
1058 | |
1059 | if (p->pack_fd == -1 && open_packed_git(p)) | |
1060 | die("packfile %s cannot be accessed", p->pack_name); | |
1061 | ||
60bb8b14 | 1062 | win = xcalloc(1, sizeof(*win)); |
78a28df9 | 1063 | win->offset = (offset / window_align) * window_align; |
dc49cd76 SP |
1064 | len = p->pack_size - win->offset; |
1065 | if (len > packed_git_window_size) | |
1066 | len = packed_git_window_size; | |
1067 | win->len = (size_t)len; | |
60bb8b14 | 1068 | pack_mapped += win->len; |
11daf39b | 1069 | while (packed_git_limit < pack_mapped |
7c3ecb32 | 1070 | && unuse_one_window(p)) |
60bb8b14 | 1071 | ; /* nothing */ |
c4712e45 | 1072 | win->base = xmmap(NULL, win->len, |
60bb8b14 SP |
1073 | PROT_READ, MAP_PRIVATE, |
1074 | p->pack_fd, win->offset); | |
1075 | if (win->base == MAP_FAILED) | |
73b4e4be SP |
1076 | die("packfile %s cannot be mapped: %s", |
1077 | p->pack_name, | |
1078 | strerror(errno)); | |
d131b7af SP |
1079 | if (!win->offset && win->len == p->pack_size |
1080 | && !p->do_not_close) { | |
1081 | close(p->pack_fd); | |
1082 | pack_open_fds--; | |
1083 | p->pack_fd = -1; | |
1084 | } | |
a53128b6 SP |
1085 | pack_mmap_calls++; |
1086 | pack_open_windows++; | |
1087 | if (pack_mapped > peak_pack_mapped) | |
1088 | peak_pack_mapped = pack_mapped; | |
1089 | if (pack_open_windows > peak_pack_open_windows) | |
1090 | peak_pack_open_windows = pack_open_windows; | |
60bb8b14 SP |
1091 | win->next = p->windows; |
1092 | p->windows = win; | |
1093 | } | |
1f688557 | 1094 | } |
03e79c88 SP |
1095 | if (win != *w_cursor) { |
1096 | win->last_used = pack_used_ctr++; | |
1097 | win->inuse_cnt++; | |
1098 | *w_cursor = win; | |
1099 | } | |
60bb8b14 | 1100 | offset -= win->offset; |
03e79c88 | 1101 | if (left) |
dc49cd76 | 1102 | *left = win->len - xsize_t(offset); |
03e79c88 | 1103 | return win->base + offset; |
1f688557 JH |
1104 | } |
1105 | ||
27d69a46 NP |
1106 | static struct packed_git *alloc_packed_git(int extra) |
1107 | { | |
1108 | struct packed_git *p = xmalloc(sizeof(*p) + extra); | |
1109 | memset(p, 0, sizeof(*p)); | |
1110 | p->pack_fd = -1; | |
1111 | return p; | |
1112 | } | |
1113 | ||
e0500293 JN |
1114 | static void try_to_free_pack_memory(size_t size) |
1115 | { | |
7c3ecb32 | 1116 | release_pack_memory(size); |
e0500293 JN |
1117 | } |
1118 | ||
42873078 | 1119 | struct packed_git *add_packed_git(const char *path, int path_len, int local) |
1f688557 | 1120 | { |
e0500293 | 1121 | static int have_set_try_to_free_routine; |
1f688557 | 1122 | struct stat st; |
27d69a46 | 1123 | struct packed_git *p = alloc_packed_git(path_len + 2); |
1f688557 | 1124 | |
e0500293 JN |
1125 | if (!have_set_try_to_free_routine) { |
1126 | have_set_try_to_free_routine = 1; | |
1127 | set_try_to_free_routine(try_to_free_pack_memory); | |
1128 | } | |
1129 | ||
42873078 NP |
1130 | /* |
1131 | * Make sure a corresponding .pack file exists and that | |
1132 | * the index looks sane. | |
1133 | */ | |
1134 | path_len -= strlen(".idx"); | |
27d69a46 NP |
1135 | if (path_len < 1) { |
1136 | free(p); | |
1f688557 | 1137 | return NULL; |
27d69a46 | 1138 | } |
42873078 | 1139 | memcpy(p->pack_name, path, path_len); |
8d25931d BC |
1140 | |
1141 | strcpy(p->pack_name + path_len, ".keep"); | |
1142 | if (!access(p->pack_name, F_OK)) | |
1143 | p->pack_keep = 1; | |
1144 | ||
42873078 | 1145 | strcpy(p->pack_name + path_len, ".pack"); |
d079837e | 1146 | if (stat(p->pack_name, &st) || !S_ISREG(st.st_mode)) { |
42873078 | 1147 | free(p); |
1f688557 JH |
1148 | return NULL; |
1149 | } | |
42873078 | 1150 | |
1f688557 JH |
1151 | /* ok, it looks sane as far as we can check without |
1152 | * actually mapping the pack file. | |
1153 | */ | |
1f688557 | 1154 | p->pack_size = st.st_size; |
9d835df2 | 1155 | p->pack_local = local; |
b867092f | 1156 | p->mtime = st.st_mtime; |
42873078 NP |
1157 | if (path_len < 40 || get_sha1_hex(path + path_len - 40, p->sha1)) |
1158 | hashclr(p->sha1); | |
1f688557 JH |
1159 | return p; |
1160 | } | |
1161 | ||
7b64469a | 1162 | struct packed_git *parse_pack_index(unsigned char *sha1, const char *idx_path) |
c508df5e | 1163 | { |
42873078 | 1164 | const char *path = sha1_pack_name(sha1); |
27d69a46 | 1165 | struct packed_git *p = alloc_packed_git(strlen(path) + 1); |
bf592c50 | 1166 | |
27d69a46 NP |
1167 | strcpy(p->pack_name, path); |
1168 | hashcpy(p->sha1, sha1); | |
42873078 NP |
1169 | if (check_packed_git_idx(idx_path, p)) { |
1170 | free(p); | |
bf592c50 | 1171 | return NULL; |
42873078 | 1172 | } |
bf592c50 | 1173 | |
bf592c50 DB |
1174 | return p; |
1175 | } | |
1176 | ||
1177 | void install_packed_git(struct packed_git *pack) | |
1178 | { | |
c7934306 SP |
1179 | if (pack->pack_fd != -1) |
1180 | pack_open_fds++; | |
1181 | ||
bf592c50 DB |
1182 | pack->next = packed_git; |
1183 | packed_git = pack; | |
1184 | } | |
1185 | ||
543c5caa NTND |
1186 | void (*report_garbage)(const char *desc, const char *path); |
1187 | ||
1188 | static void report_helper(const struct string_list *list, | |
1189 | int seen_bits, int first, int last) | |
1190 | { | |
1191 | const char *msg; | |
1192 | switch (seen_bits) { | |
1193 | case 0: | |
235e8d59 | 1194 | msg = "no corresponding .idx or .pack"; |
543c5caa NTND |
1195 | break; |
1196 | case 1: | |
1197 | msg = "no corresponding .idx"; | |
1198 | break; | |
1199 | case 2: | |
1200 | msg = "no corresponding .pack"; | |
1201 | break; | |
1202 | default: | |
1203 | return; | |
1204 | } | |
1205 | for (; first < last; first++) | |
1206 | report_garbage(msg, list->items[first].string); | |
1207 | } | |
1208 | ||
1209 | static void report_pack_garbage(struct string_list *list) | |
1210 | { | |
1211 | int i, baselen = -1, first = 0, seen_bits = 0; | |
1212 | ||
1213 | if (!report_garbage) | |
1214 | return; | |
1215 | ||
3383e199 | 1216 | string_list_sort(list); |
543c5caa NTND |
1217 | |
1218 | for (i = 0; i < list->nr; i++) { | |
1219 | const char *path = list->items[i].string; | |
1220 | if (baselen != -1 && | |
1221 | strncmp(path, list->items[first].string, baselen)) { | |
1222 | report_helper(list, seen_bits, first, i); | |
1223 | baselen = -1; | |
1224 | seen_bits = 0; | |
1225 | } | |
1226 | if (baselen == -1) { | |
1227 | const char *dot = strrchr(path, '.'); | |
1228 | if (!dot) { | |
1229 | report_garbage("garbage found", path); | |
1230 | continue; | |
1231 | } | |
1232 | baselen = dot - path + 1; | |
1233 | first = i; | |
1234 | } | |
1235 | if (!strcmp(path + baselen, "pack")) | |
1236 | seen_bits |= 1; | |
1237 | else if (!strcmp(path + baselen, "idx")) | |
1238 | seen_bits |= 2; | |
1239 | } | |
1240 | report_helper(list, seen_bits, first, list->nr); | |
1241 | } | |
1242 | ||
9d835df2 | 1243 | static void prepare_packed_git_one(char *objdir, int local) |
1f688557 | 1244 | { |
880fb8de RS |
1245 | struct strbuf path = STRBUF_INIT; |
1246 | size_t dirnamelen; | |
1f688557 JH |
1247 | DIR *dir; |
1248 | struct dirent *de; | |
543c5caa | 1249 | struct string_list garbage = STRING_LIST_INIT_DUP; |
1f688557 | 1250 | |
880fb8de RS |
1251 | strbuf_addstr(&path, objdir); |
1252 | strbuf_addstr(&path, "/pack"); | |
1253 | dir = opendir(path.buf); | |
b5b16990 | 1254 | if (!dir) { |
26125f6b | 1255 | if (errno != ENOENT) |
bd2afde8 | 1256 | error("unable to open object pack directory: %s: %s", |
880fb8de RS |
1257 | path.buf, strerror(errno)); |
1258 | strbuf_release(&path); | |
1f688557 | 1259 | return; |
b5b16990 | 1260 | } |
880fb8de RS |
1261 | strbuf_addch(&path, '/'); |
1262 | dirnamelen = path.len; | |
1f688557 | 1263 | while ((de = readdir(dir)) != NULL) { |
1f688557 | 1264 | struct packed_git *p; |
47bf4b0f | 1265 | size_t base_len; |
543c5caa NTND |
1266 | |
1267 | if (is_dot_or_dotdot(de->d_name)) | |
9cb18f56 JM |
1268 | continue; |
1269 | ||
880fb8de RS |
1270 | strbuf_setlen(&path, dirnamelen); |
1271 | strbuf_addstr(&path, de->d_name); | |
d90906a9 | 1272 | |
47bf4b0f JK |
1273 | base_len = path.len; |
1274 | if (strip_suffix_mem(path.buf, &base_len, ".idx")) { | |
d90906a9 NTND |
1275 | /* Don't reopen a pack we already have. */ |
1276 | for (p = packed_git; p; p = p->next) { | |
47bf4b0f JK |
1277 | size_t len; |
1278 | if (strip_suffix(p->pack_name, ".pack", &len) && | |
1279 | len == base_len && | |
1280 | !memcmp(p->pack_name, path.buf, len)) | |
d90906a9 NTND |
1281 | break; |
1282 | } | |
1283 | if (p == NULL && | |
1284 | /* | |
1285 | * See if it really is a valid .idx file with | |
1286 | * corresponding .pack file that we can map. | |
1287 | */ | |
880fb8de | 1288 | (p = add_packed_git(path.buf, path.len, local)) != NULL) |
d90906a9 | 1289 | install_packed_git(p); |
86f7780c | 1290 | } |
543c5caa NTND |
1291 | |
1292 | if (!report_garbage) | |
1293 | continue; | |
1294 | ||
2975c770 JK |
1295 | if (ends_with(de->d_name, ".idx") || |
1296 | ends_with(de->d_name, ".pack") || | |
1297 | ends_with(de->d_name, ".bitmap") || | |
1298 | ends_with(de->d_name, ".keep")) | |
880fb8de | 1299 | string_list_append(&garbage, path.buf); |
543c5caa | 1300 | else |
880fb8de | 1301 | report_garbage("garbage found", path.buf); |
1f688557 | 1302 | } |
5b35bcd5 | 1303 | closedir(dir); |
543c5caa NTND |
1304 | report_pack_garbage(&garbage); |
1305 | string_list_clear(&garbage, 0); | |
880fb8de | 1306 | strbuf_release(&path); |
1f688557 JH |
1307 | } |
1308 | ||
b867092f JH |
1309 | static int sort_pack(const void *a_, const void *b_) |
1310 | { | |
1311 | struct packed_git *a = *((struct packed_git **)a_); | |
1312 | struct packed_git *b = *((struct packed_git **)b_); | |
1313 | int st; | |
1314 | ||
1315 | /* | |
1316 | * Local packs tend to contain objects specific to our | |
1317 | * variant of the project than remote ones. In addition, | |
1318 | * remote ones could be on a network mounted filesystem. | |
1319 | * Favor local ones for these reasons. | |
1320 | */ | |
1321 | st = a->pack_local - b->pack_local; | |
1322 | if (st) | |
1323 | return -st; | |
1324 | ||
1325 | /* | |
1326 | * Younger packs tend to contain more recent objects, | |
1327 | * and more recent objects tend to get accessed more | |
1328 | * often. | |
1329 | */ | |
1330 | if (a->mtime < b->mtime) | |
1331 | return 1; | |
1332 | else if (a->mtime == b->mtime) | |
1333 | return 0; | |
1334 | return -1; | |
1335 | } | |
1336 | ||
1337 | static void rearrange_packed_git(void) | |
1338 | { | |
1339 | struct packed_git **ary, *p; | |
1340 | int i, n; | |
1341 | ||
1342 | for (n = 0, p = packed_git; p; p = p->next) | |
1343 | n++; | |
1344 | if (n < 2) | |
1345 | return; | |
1346 | ||
1347 | /* prepare an array of packed_git for easier sorting */ | |
1348 | ary = xcalloc(n, sizeof(struct packed_git *)); | |
1349 | for (n = 0, p = packed_git; p; p = p->next) | |
1350 | ary[n++] = p; | |
1351 | ||
1352 | qsort(ary, n, sizeof(struct packed_git *), sort_pack); | |
1353 | ||
1354 | /* link them back again */ | |
1355 | for (i = 0; i < n - 1; i++) | |
1356 | ary[i]->next = ary[i + 1]; | |
1357 | ary[n - 1]->next = NULL; | |
1358 | packed_git = ary[0]; | |
1359 | ||
1360 | free(ary); | |
1361 | } | |
1362 | ||
637cdd9d | 1363 | static int prepare_packed_git_run_once = 0; |
9a217f2a | 1364 | void prepare_packed_git(void) |
1f688557 | 1365 | { |
d5a63b99 | 1366 | struct alternate_object_database *alt; |
1f688557 | 1367 | |
637cdd9d | 1368 | if (prepare_packed_git_run_once) |
1f688557 | 1369 | return; |
9d835df2 | 1370 | prepare_packed_git_one(get_object_directory(), 1); |
9a217f2a | 1371 | prepare_alt_odb(); |
d5a63b99 | 1372 | for (alt = alt_odb_list; alt; alt = alt->next) { |
1494e038 | 1373 | alt->name[-1] = 0; |
9d835df2 | 1374 | prepare_packed_git_one(alt->base, 0); |
1494e038 | 1375 | alt->name[-1] = '/'; |
1f688557 | 1376 | } |
b867092f | 1377 | rearrange_packed_git(); |
637cdd9d JK |
1378 | prepare_packed_git_run_once = 1; |
1379 | } | |
1380 | ||
fc04c412 | 1381 | void reprepare_packed_git(void) |
637cdd9d JK |
1382 | { |
1383 | prepare_packed_git_run_once = 0; | |
1384 | prepare_packed_git(); | |
1f688557 JH |
1385 | } |
1386 | ||
8eca0b47 NP |
1387 | static void mark_bad_packed_object(struct packed_git *p, |
1388 | const unsigned char *sha1) | |
1389 | { | |
1390 | unsigned i; | |
1391 | for (i = 0; i < p->num_bad_objects; i++) | |
1392 | if (!hashcmp(sha1, p->bad_object_sha1 + 20 * i)) | |
1393 | return; | |
1394 | p->bad_object_sha1 = xrealloc(p->bad_object_sha1, 20 * (p->num_bad_objects + 1)); | |
1395 | hashcpy(p->bad_object_sha1 + 20 * p->num_bad_objects, sha1); | |
1396 | p->num_bad_objects++; | |
1397 | } | |
1398 | ||
b6c4cecc | 1399 | static const struct packed_git *has_packed_and_bad(const unsigned char *sha1) |
ac939109 NP |
1400 | { |
1401 | struct packed_git *p; | |
1402 | unsigned i; | |
1403 | ||
1404 | for (p = packed_git; p; p = p->next) | |
1405 | for (i = 0; i < p->num_bad_objects; i++) | |
1406 | if (!hashcmp(sha1, p->bad_object_sha1 + 20 * i)) | |
b6c4cecc JH |
1407 | return p; |
1408 | return NULL; | |
ac939109 NP |
1409 | } |
1410 | ||
090ea126 NTND |
1411 | /* |
1412 | * With an in-core object data in "map", rehash it to make sure the | |
1413 | * object name actually matches "sha1" to detect object corruption. | |
1414 | * With "map" == NULL, try reading the object named with "sha1" using | |
1415 | * the streaming interface and rehash it to do the same. | |
1416 | */ | |
1417 | int check_sha1_signature(const unsigned char *sha1, void *map, | |
1418 | unsigned long size, const char *type) | |
0fcfd160 LT |
1419 | { |
1420 | unsigned char real_sha1[20]; | |
090ea126 NTND |
1421 | enum object_type obj_type; |
1422 | struct git_istream *st; | |
1423 | git_SHA_CTX c; | |
1424 | char hdr[32]; | |
1425 | int hdrlen; | |
1426 | ||
1427 | if (map) { | |
1428 | hash_sha1_file(map, size, type, real_sha1); | |
1429 | return hashcmp(sha1, real_sha1) ? -1 : 0; | |
1430 | } | |
1431 | ||
1432 | st = open_istream(sha1, &obj_type, &size, NULL); | |
1433 | if (!st) | |
1434 | return -1; | |
1435 | ||
1436 | /* Generate the header */ | |
1437 | hdrlen = sprintf(hdr, "%s %lu", typename(obj_type), size) + 1; | |
1438 | ||
1439 | /* Sha1.. */ | |
1440 | git_SHA1_Init(&c); | |
1441 | git_SHA1_Update(&c, hdr, hdrlen); | |
1442 | for (;;) { | |
1443 | char buf[1024 * 16]; | |
1444 | ssize_t readlen = read_istream(st, buf, sizeof(buf)); | |
1445 | ||
f54fac53 JK |
1446 | if (readlen < 0) { |
1447 | close_istream(st); | |
1448 | return -1; | |
1449 | } | |
090ea126 NTND |
1450 | if (!readlen) |
1451 | break; | |
1452 | git_SHA1_Update(&c, buf, readlen); | |
1453 | } | |
1454 | git_SHA1_Final(real_sha1, &c); | |
1455 | close_istream(st); | |
a89fccd2 | 1456 | return hashcmp(sha1, real_sha1) ? -1 : 0; |
0fcfd160 LT |
1457 | } |
1458 | ||
ec73f580 | 1459 | int git_open_noatime(const char *name) |
44d1c19e LT |
1460 | { |
1461 | static int sha1_file_open_flag = O_NOATIME; | |
44d1c19e | 1462 | |
f2e872aa SP |
1463 | for (;;) { |
1464 | int fd = open(name, O_RDONLY | sha1_file_open_flag); | |
44d1c19e | 1465 | if (fd >= 0) |
f2e872aa SP |
1466 | return fd; |
1467 | ||
f2e872aa SP |
1468 | /* Might the failure be due to O_NOATIME? */ |
1469 | if (errno != ENOENT && sha1_file_open_flag) { | |
44d1c19e | 1470 | sha1_file_open_flag = 0; |
f2e872aa SP |
1471 | continue; |
1472 | } | |
1473 | ||
1474 | return -1; | |
44d1c19e | 1475 | } |
44d1c19e LT |
1476 | } |
1477 | ||
052fe5ea JK |
1478 | static int stat_sha1_file(const unsigned char *sha1, struct stat *st) |
1479 | { | |
052fe5ea JK |
1480 | struct alternate_object_database *alt; |
1481 | ||
30d6c6ea | 1482 | if (!lstat(sha1_file_name(sha1), st)) |
052fe5ea JK |
1483 | return 0; |
1484 | ||
1485 | prepare_alt_odb(); | |
1486 | errno = ENOENT; | |
1487 | for (alt = alt_odb_list; alt; alt = alt->next) { | |
30d6c6ea | 1488 | fill_sha1_path(alt->name, sha1); |
052fe5ea JK |
1489 | if (!lstat(alt->base, st)) |
1490 | return 0; | |
1491 | } | |
1492 | ||
1493 | return -1; | |
1494 | } | |
1495 | ||
44d1c19e LT |
1496 | static int open_sha1_file(const unsigned char *sha1) |
1497 | { | |
1498 | int fd; | |
44d1c19e | 1499 | struct alternate_object_database *alt; |
d6c8a05b | 1500 | int most_interesting_errno; |
44d1c19e | 1501 | |
30d6c6ea | 1502 | fd = git_open_noatime(sha1_file_name(sha1)); |
44d1c19e LT |
1503 | if (fd >= 0) |
1504 | return fd; | |
d6c8a05b | 1505 | most_interesting_errno = errno; |
44d1c19e LT |
1506 | |
1507 | prepare_alt_odb(); | |
44d1c19e | 1508 | for (alt = alt_odb_list; alt; alt = alt->next) { |
30d6c6ea | 1509 | fill_sha1_path(alt->name, sha1); |
f4e51683 | 1510 | fd = git_open_noatime(alt->base); |
44d1c19e LT |
1511 | if (fd >= 0) |
1512 | return fd; | |
d6c8a05b JK |
1513 | if (most_interesting_errno == ENOENT) |
1514 | most_interesting_errno = errno; | |
44d1c19e | 1515 | } |
d6c8a05b | 1516 | errno = most_interesting_errno; |
44d1c19e LT |
1517 | return -1; |
1518 | } | |
1519 | ||
f0270efd | 1520 | void *map_sha1_file(const unsigned char *sha1, unsigned long *size) |
0fcfd160 | 1521 | { |
0fcfd160 | 1522 | void *map; |
144bde78 | 1523 | int fd; |
ace1534d | 1524 | |
44d1c19e LT |
1525 | fd = open_sha1_file(sha1); |
1526 | map = NULL; | |
1527 | if (fd >= 0) { | |
1528 | struct stat st; | |
0fcfd160 | 1529 | |
44d1c19e LT |
1530 | if (!fstat(fd, &st)) { |
1531 | *size = xsize_t(st.st_size); | |
33e42de0 MM |
1532 | if (!*size) { |
1533 | /* mmap() is forbidden on empty files */ | |
1534 | error("object file %s is empty", sha1_file_name(sha1)); | |
1535 | return NULL; | |
1536 | } | |
44d1c19e | 1537 | map = xmmap(NULL, *size, PROT_READ, MAP_PRIVATE, fd, 0); |
144bde78 | 1538 | } |
44d1c19e | 1539 | close(fd); |
0fcfd160 | 1540 | } |
0fcfd160 LT |
1541 | return map; |
1542 | } | |
1543 | ||
09ded04b NP |
1544 | unsigned long unpack_object_header_buffer(const unsigned char *buf, |
1545 | unsigned long len, enum object_type *type, unsigned long *sizep) | |
c4483576 | 1546 | { |
ad1ed5ee | 1547 | unsigned shift; |
48fb7deb | 1548 | unsigned long size, c; |
ad1ed5ee JH |
1549 | unsigned long used = 0; |
1550 | ||
1551 | c = buf[used++]; | |
1552 | *type = (c >> 4) & 7; | |
1553 | size = c & 15; | |
1554 | shift = 4; | |
1555 | while (c & 0x80) { | |
f630cfda | 1556 | if (len <= used || bitsizeof(long) <= shift) { |
09ded04b | 1557 | error("bad object header"); |
ea4f9685 JH |
1558 | size = used = 0; |
1559 | break; | |
09ded04b | 1560 | } |
ad1ed5ee JH |
1561 | c = buf[used++]; |
1562 | size += (c & 0x7f) << shift; | |
1563 | shift += 7; | |
1564 | } | |
1565 | *sizep = size; | |
1566 | return used; | |
1567 | } | |
1568 | ||
eb4f4076 | 1569 | int unpack_sha1_header(git_zstream *stream, unsigned char *map, unsigned long mapsize, void *buffer, unsigned long bufsiz) |
ad1ed5ee | 1570 | { |
c4483576 LT |
1571 | /* Get the data stream */ |
1572 | memset(stream, 0, sizeof(*stream)); | |
1573 | stream->next_in = map; | |
1574 | stream->avail_in = mapsize; | |
1575 | stream->next_out = buffer; | |
93821bd9 LT |
1576 | stream->avail_out = bufsiz; |
1577 | ||
39c68542 | 1578 | git_inflate_init(stream); |
cc5c54e7 | 1579 | return git_inflate(stream, 0); |
c4483576 LT |
1580 | } |
1581 | ||
ef49a7a0 | 1582 | static void *unpack_sha1_rest(git_zstream *stream, void *buffer, unsigned long size, const unsigned char *sha1) |
5180cacc LT |
1583 | { |
1584 | int bytes = strlen(buffer) + 1; | |
3aee68aa | 1585 | unsigned char *buf = xmallocz(size); |
93821bd9 | 1586 | unsigned long n; |
7efbff75 | 1587 | int status = Z_OK; |
5180cacc | 1588 | |
93821bd9 LT |
1589 | n = stream->total_out - bytes; |
1590 | if (n > size) | |
1591 | n = size; | |
1592 | memcpy(buf, (char *) buffer + bytes, n); | |
1593 | bytes = n; | |
456cdf6e LT |
1594 | if (bytes <= size) { |
1595 | /* | |
1596 | * The above condition must be (bytes <= size), not | |
1597 | * (bytes < size). In other words, even though we | |
ccf5ace0 | 1598 | * expect no more output and set avail_out to zero, |
456cdf6e LT |
1599 | * the input zlib stream may have bytes that express |
1600 | * "this concludes the stream", and we *do* want to | |
1601 | * eat that input. | |
1602 | * | |
1603 | * Otherwise we would not be able to test that we | |
1604 | * consumed all the input to reach the expected size; | |
1605 | * we also want to check that zlib tells us that all | |
1606 | * went well with status == Z_STREAM_END at the end. | |
1607 | */ | |
5180cacc LT |
1608 | stream->next_out = buf + bytes; |
1609 | stream->avail_out = size - bytes; | |
7efbff75 | 1610 | while (status == Z_OK) |
39c68542 | 1611 | status = git_inflate(stream, Z_FINISH); |
5180cacc | 1612 | } |
456cdf6e | 1613 | if (status == Z_STREAM_END && !stream->avail_in) { |
39c68542 | 1614 | git_inflate_end(stream); |
7efbff75 JH |
1615 | return buf; |
1616 | } | |
1617 | ||
1618 | if (status < 0) | |
1619 | error("corrupt loose object '%s'", sha1_to_hex(sha1)); | |
1620 | else if (stream->avail_in) | |
1621 | error("garbage at end of loose object '%s'", | |
1622 | sha1_to_hex(sha1)); | |
1623 | free(buf); | |
1624 | return NULL; | |
5180cacc LT |
1625 | } |
1626 | ||
1627 | /* | |
1628 | * We used to just use "sscanf()", but that's actually way | |
1629 | * too permissive for what we want to check. So do an anal | |
1630 | * object header parse by hand. | |
1631 | */ | |
f0270efd | 1632 | int parse_sha1_header(const char *hdr, unsigned long *sizep) |
5180cacc | 1633 | { |
21666f1a | 1634 | char type[10]; |
5180cacc LT |
1635 | int i; |
1636 | unsigned long size; | |
1637 | ||
1638 | /* | |
a6080a0a | 1639 | * The type can be at most ten bytes (including the |
5180cacc | 1640 | * terminating '\0' that we add), and is followed by |
21666f1a | 1641 | * a space. |
5180cacc | 1642 | */ |
21666f1a | 1643 | i = 0; |
5180cacc LT |
1644 | for (;;) { |
1645 | char c = *hdr++; | |
1646 | if (c == ' ') | |
1647 | break; | |
21666f1a NP |
1648 | type[i++] = c; |
1649 | if (i >= sizeof(type)) | |
5180cacc | 1650 | return -1; |
5180cacc | 1651 | } |
21666f1a | 1652 | type[i] = 0; |
5180cacc LT |
1653 | |
1654 | /* | |
1655 | * The length must follow immediately, and be in canonical | |
1656 | * decimal format (ie "010" is not valid). | |
1657 | */ | |
1658 | size = *hdr++ - '0'; | |
1659 | if (size > 9) | |
1660 | return -1; | |
1661 | if (size) { | |
1662 | for (;;) { | |
1663 | unsigned long c = *hdr - '0'; | |
1664 | if (c > 9) | |
1665 | break; | |
1666 | hdr++; | |
1667 | size = size * 10 + c; | |
1668 | } | |
1669 | } | |
1670 | *sizep = size; | |
1671 | ||
1672 | /* | |
1673 | * The length must be followed by a zero byte | |
1674 | */ | |
21666f1a | 1675 | return *hdr ? -1 : type_from_string(type); |
5180cacc LT |
1676 | } |
1677 | ||
7efbff75 | 1678 | static void *unpack_sha1_file(void *map, unsigned long mapsize, enum object_type *type, unsigned long *size, const unsigned char *sha1) |
0fcfd160 | 1679 | { |
5180cacc | 1680 | int ret; |
ef49a7a0 | 1681 | git_zstream stream; |
5180cacc | 1682 | char hdr[8192]; |
0fcfd160 | 1683 | |
5180cacc | 1684 | ret = unpack_sha1_header(&stream, map, mapsize, hdr, sizeof(hdr)); |
21666f1a | 1685 | if (ret < Z_OK || (*type = parse_sha1_header(hdr, size)) < 0) |
0fcfd160 LT |
1686 | return NULL; |
1687 | ||
7efbff75 | 1688 | return unpack_sha1_rest(&stream, hdr, *size, sha1); |
0fcfd160 LT |
1689 | } |
1690 | ||
54dab52a NP |
1691 | unsigned long get_size_from_delta(struct packed_git *p, |
1692 | struct pack_window **w_curs, | |
1693 | off_t curpos) | |
1694 | { | |
1695 | const unsigned char *data; | |
1696 | unsigned char delta_head[20], *in; | |
ef49a7a0 | 1697 | git_zstream stream; |
54dab52a NP |
1698 | int st; |
1699 | ||
1700 | memset(&stream, 0, sizeof(stream)); | |
1701 | stream.next_out = delta_head; | |
1702 | stream.avail_out = sizeof(delta_head); | |
1703 | ||
39c68542 | 1704 | git_inflate_init(&stream); |
54dab52a NP |
1705 | do { |
1706 | in = use_pack(p, w_curs, curpos, &stream.avail_in); | |
1707 | stream.next_in = in; | |
39c68542 | 1708 | st = git_inflate(&stream, Z_FINISH); |
54dab52a NP |
1709 | curpos += stream.next_in - in; |
1710 | } while ((st == Z_OK || st == Z_BUF_ERROR) && | |
1711 | stream.total_out < sizeof(delta_head)); | |
39c68542 | 1712 | git_inflate_end(&stream); |
3d77d877 NP |
1713 | if ((st != Z_STREAM_END) && stream.total_out != sizeof(delta_head)) { |
1714 | error("delta data unpack-initial failed"); | |
1715 | return 0; | |
1716 | } | |
54dab52a NP |
1717 | |
1718 | /* Examine the initial part of the delta to figure out | |
1719 | * the result size. | |
1720 | */ | |
1721 | data = delta_head; | |
1722 | ||
1723 | /* ignore base size */ | |
1724 | get_delta_hdr_size(&data, delta_head+sizeof(delta_head)); | |
1725 | ||
1726 | /* Read the result size */ | |
1727 | return get_delta_hdr_size(&data, delta_head+sizeof(delta_head)); | |
1728 | } | |
1729 | ||
c4001d92 | 1730 | static off_t get_delta_base(struct packed_git *p, |
03e79c88 | 1731 | struct pack_window **w_curs, |
c4001d92 | 1732 | off_t *curpos, |
21666f1a | 1733 | enum object_type type, |
c4001d92 | 1734 | off_t delta_obj_offset) |
eb32d236 | 1735 | { |
2b87c45b | 1736 | unsigned char *base_info = use_pack(p, w_curs, *curpos, NULL); |
c4001d92 | 1737 | off_t base_offset; |
eb32d236 | 1738 | |
8d8a4ea5 SP |
1739 | /* use_pack() assured us we have [base_info, base_info + 20) |
1740 | * as a range that we can look at without walking off the | |
1741 | * end of the mapped window. Its actually the hash size | |
1742 | * that is assured. An OFS_DELTA longer than the hash size | |
1743 | * is stupid, as then a REF_DELTA would be smaller to store. | |
1744 | */ | |
21666f1a | 1745 | if (type == OBJ_OFS_DELTA) { |
eb32d236 NP |
1746 | unsigned used = 0; |
1747 | unsigned char c = base_info[used++]; | |
1748 | base_offset = c & 127; | |
1749 | while (c & 128) { | |
1750 | base_offset += 1; | |
8723f216 | 1751 | if (!base_offset || MSB(base_offset, 7)) |
8eca0b47 | 1752 | return 0; /* overflow */ |
eb32d236 NP |
1753 | c = base_info[used++]; |
1754 | base_offset = (base_offset << 7) + (c & 127); | |
1755 | } | |
1756 | base_offset = delta_obj_offset - base_offset; | |
d8f32556 | 1757 | if (base_offset <= 0 || base_offset >= delta_obj_offset) |
8eca0b47 | 1758 | return 0; /* out of bound */ |
2b87c45b | 1759 | *curpos += used; |
21666f1a | 1760 | } else if (type == OBJ_REF_DELTA) { |
eb32d236 NP |
1761 | /* The base entry _must_ be in the same pack */ |
1762 | base_offset = find_pack_entry_one(base_info, p); | |
2b87c45b | 1763 | *curpos += 20; |
eb32d236 NP |
1764 | } else |
1765 | die("I am totally screwed"); | |
2b87c45b | 1766 | return base_offset; |
eb32d236 NP |
1767 | } |
1768 | ||
5d642e75 JK |
1769 | /* |
1770 | * Like get_delta_base above, but we return the sha1 instead of the pack | |
1771 | * offset. This means it is cheaper for REF deltas (we do not have to do | |
1772 | * the final object lookup), but more expensive for OFS deltas (we | |
1773 | * have to load the revidx to convert the offset back into a sha1). | |
1774 | */ | |
1775 | static const unsigned char *get_delta_base_sha1(struct packed_git *p, | |
1776 | struct pack_window **w_curs, | |
1777 | off_t curpos, | |
1778 | enum object_type type, | |
1779 | off_t delta_obj_offset) | |
1780 | { | |
1781 | if (type == OBJ_REF_DELTA) { | |
1782 | unsigned char *base = use_pack(p, w_curs, curpos, NULL); | |
1783 | return base; | |
1784 | } else if (type == OBJ_OFS_DELTA) { | |
1785 | struct revindex_entry *revidx; | |
1786 | off_t base_offset = get_delta_base(p, w_curs, &curpos, | |
1787 | type, delta_obj_offset); | |
1788 | ||
1789 | if (!base_offset) | |
1790 | return NULL; | |
1791 | ||
1792 | revidx = find_pack_revindex(p, base_offset); | |
1793 | if (!revidx) | |
1794 | return NULL; | |
1795 | ||
1796 | return nth_packed_object_sha1(p, revidx->nr); | |
1797 | } else | |
1798 | return NULL; | |
1799 | } | |
1800 | ||
f8c8abc5 JH |
1801 | int unpack_object_header(struct packed_git *p, |
1802 | struct pack_window **w_curs, | |
1803 | off_t *curpos, | |
1804 | unsigned long *sizep) | |
a733cb60 | 1805 | { |
03e79c88 | 1806 | unsigned char *base; |
ef49a7a0 | 1807 | unsigned long left; |
ad1ed5ee | 1808 | unsigned long used; |
2b87c45b | 1809 | enum object_type type; |
a733cb60 | 1810 | |
8d8a4ea5 | 1811 | /* use_pack() assures us we have [base, base + 20) available |
0353a0c4 | 1812 | * as a range that we can look at. (Its actually the hash |
3dff5379 | 1813 | * size that is assured.) With our object header encoding |
8d8a4ea5 SP |
1814 | * the maximum deflated object size is 2^137, which is just |
1815 | * insane, so we know won't exceed what we have been given. | |
1816 | */ | |
2b87c45b | 1817 | base = use_pack(p, w_curs, *curpos, &left); |
09ded04b NP |
1818 | used = unpack_object_header_buffer(base, left, &type, sizep); |
1819 | if (!used) { | |
1820 | type = OBJ_BAD; | |
1821 | } else | |
1822 | *curpos += used; | |
ad1ed5ee | 1823 | |
2b87c45b | 1824 | return type; |
a733cb60 LT |
1825 | } |
1826 | ||
790d96c0 TR |
1827 | static int retry_bad_packed_offset(struct packed_git *p, off_t obj_offset) |
1828 | { | |
1829 | int type; | |
1830 | struct revindex_entry *revidx; | |
1831 | const unsigned char *sha1; | |
1832 | revidx = find_pack_revindex(p, obj_offset); | |
1833 | if (!revidx) | |
1834 | return OBJ_BAD; | |
1835 | sha1 = nth_packed_object_sha1(p, revidx->nr); | |
1836 | mark_bad_packed_object(p, sha1); | |
1837 | type = sha1_object_info(sha1, NULL); | |
1838 | if (type <= OBJ_NONE) | |
1839 | return OBJ_BAD; | |
1840 | return type; | |
1841 | } | |
1842 | ||
790d96c0 TR |
1843 | #define POI_STACK_PREALLOC 64 |
1844 | ||
90191d37 JK |
1845 | static enum object_type packed_to_object_type(struct packed_git *p, |
1846 | off_t obj_offset, | |
1847 | enum object_type type, | |
1848 | struct pack_window **w_curs, | |
1849 | off_t curpos) | |
1f688557 | 1850 | { |
790d96c0 TR |
1851 | off_t small_poi_stack[POI_STACK_PREALLOC]; |
1852 | off_t *poi_stack = small_poi_stack; | |
1853 | int poi_stack_nr = 0, poi_stack_alloc = POI_STACK_PREALLOC; | |
5db47c2b | 1854 | |
790d96c0 TR |
1855 | while (type == OBJ_OFS_DELTA || type == OBJ_REF_DELTA) { |
1856 | off_t base_offset; | |
90191d37 | 1857 | unsigned long size; |
790d96c0 TR |
1858 | /* Push the object we're going to leave behind */ |
1859 | if (poi_stack_nr >= poi_stack_alloc && poi_stack == small_poi_stack) { | |
1860 | poi_stack_alloc = alloc_nr(poi_stack_nr); | |
1861 | poi_stack = xmalloc(sizeof(off_t)*poi_stack_alloc); | |
1862 | memcpy(poi_stack, small_poi_stack, sizeof(off_t)*poi_stack_nr); | |
1863 | } else { | |
1864 | ALLOC_GROW(poi_stack, poi_stack_nr+1, poi_stack_alloc); | |
1865 | } | |
1866 | poi_stack[poi_stack_nr++] = obj_offset; | |
1867 | /* If parsing the base offset fails, just unwind */ | |
90191d37 | 1868 | base_offset = get_delta_base(p, w_curs, &curpos, type, obj_offset); |
790d96c0 TR |
1869 | if (!base_offset) |
1870 | goto unwind; | |
1871 | curpos = obj_offset = base_offset; | |
90191d37 | 1872 | type = unpack_object_header(p, w_curs, &curpos, &size); |
790d96c0 TR |
1873 | if (type <= OBJ_NONE) { |
1874 | /* If getting the base itself fails, we first | |
1875 | * retry the base, otherwise unwind */ | |
1876 | type = retry_bad_packed_offset(p, base_offset); | |
1877 | if (type > OBJ_NONE) | |
1878 | goto out; | |
1879 | goto unwind; | |
1880 | } | |
1881 | } | |
1882 | ||
21666f1a | 1883 | switch (type) { |
790d96c0 | 1884 | case OBJ_BAD: |
a733cb60 | 1885 | case OBJ_COMMIT: |
a733cb60 | 1886 | case OBJ_TREE: |
a733cb60 | 1887 | case OBJ_BLOB: |
a733cb60 | 1888 | case OBJ_TAG: |
a69d0943 | 1889 | break; |
1f688557 | 1890 | default: |
3d77d877 NP |
1891 | error("unknown object type %i at offset %"PRIuMAX" in %s", |
1892 | type, (uintmax_t)obj_offset, p->pack_name); | |
1893 | type = OBJ_BAD; | |
1f688557 | 1894 | } |
790d96c0 TR |
1895 | |
1896 | out: | |
1897 | if (poi_stack != small_poi_stack) | |
1898 | free(poi_stack); | |
21666f1a | 1899 | return type; |
790d96c0 TR |
1900 | |
1901 | unwind: | |
1902 | while (poi_stack_nr) { | |
1903 | obj_offset = poi_stack[--poi_stack_nr]; | |
1904 | type = retry_bad_packed_offset(p, obj_offset); | |
1905 | if (type > OBJ_NONE) | |
1906 | goto out; | |
1907 | } | |
1908 | type = OBJ_BAD; | |
1909 | goto out; | |
1f688557 JH |
1910 | } |
1911 | ||
90191d37 | 1912 | static int packed_object_info(struct packed_git *p, off_t obj_offset, |
23c339c0 | 1913 | struct object_info *oi) |
90191d37 JK |
1914 | { |
1915 | struct pack_window *w_curs = NULL; | |
1916 | unsigned long size; | |
1917 | off_t curpos = obj_offset; | |
1918 | enum object_type type; | |
1919 | ||
412916ee JK |
1920 | /* |
1921 | * We always get the representation type, but only convert it to | |
1922 | * a "real" type later if the caller is interested. | |
1923 | */ | |
90191d37 JK |
1924 | type = unpack_object_header(p, &w_curs, &curpos, &size); |
1925 | ||
23c339c0 | 1926 | if (oi->sizep) { |
90191d37 JK |
1927 | if (type == OBJ_OFS_DELTA || type == OBJ_REF_DELTA) { |
1928 | off_t tmp_pos = curpos; | |
1929 | off_t base_offset = get_delta_base(p, &w_curs, &tmp_pos, | |
1930 | type, obj_offset); | |
1931 | if (!base_offset) { | |
1932 | type = OBJ_BAD; | |
1933 | goto out; | |
1934 | } | |
23c339c0 JK |
1935 | *oi->sizep = get_size_from_delta(p, &w_curs, tmp_pos); |
1936 | if (*oi->sizep == 0) { | |
90191d37 JK |
1937 | type = OBJ_BAD; |
1938 | goto out; | |
1939 | } | |
1940 | } else { | |
23c339c0 | 1941 | *oi->sizep = size; |
90191d37 JK |
1942 | } |
1943 | } | |
1944 | ||
23c339c0 | 1945 | if (oi->disk_sizep) { |
90191d37 | 1946 | struct revindex_entry *revidx = find_pack_revindex(p, obj_offset); |
23c339c0 | 1947 | *oi->disk_sizep = revidx[1].offset - obj_offset; |
90191d37 JK |
1948 | } |
1949 | ||
23c339c0 JK |
1950 | if (oi->typep) { |
1951 | *oi->typep = packed_to_object_type(p, obj_offset, type, &w_curs, curpos); | |
1952 | if (*oi->typep < 0) { | |
412916ee JK |
1953 | type = OBJ_BAD; |
1954 | goto out; | |
1955 | } | |
1956 | } | |
90191d37 | 1957 | |
5d642e75 JK |
1958 | if (oi->delta_base_sha1) { |
1959 | if (type == OBJ_OFS_DELTA || type == OBJ_REF_DELTA) { | |
1960 | const unsigned char *base; | |
1961 | ||
1962 | base = get_delta_base_sha1(p, &w_curs, curpos, | |
1963 | type, obj_offset); | |
1964 | if (!base) { | |
1965 | type = OBJ_BAD; | |
1966 | goto out; | |
1967 | } | |
1968 | ||
1969 | hashcpy(oi->delta_base_sha1, base); | |
1970 | } else | |
1971 | hashclr(oi->delta_base_sha1); | |
1972 | } | |
1973 | ||
90191d37 JK |
1974 | out: |
1975 | unuse_pack(&w_curs); | |
1976 | return type; | |
1977 | } | |
1978 | ||
eb950c19 | 1979 | static void *unpack_compressed_entry(struct packed_git *p, |
03e79c88 | 1980 | struct pack_window **w_curs, |
c4001d92 | 1981 | off_t curpos, |
eb950c19 | 1982 | unsigned long size) |
de530aaa SP |
1983 | { |
1984 | int st; | |
ef49a7a0 | 1985 | git_zstream stream; |
079afb18 | 1986 | unsigned char *buffer, *in; |
de530aaa | 1987 | |
735efde8 NTND |
1988 | buffer = xmallocz_gently(size); |
1989 | if (!buffer) | |
1990 | return NULL; | |
de530aaa | 1991 | memset(&stream, 0, sizeof(stream)); |
de530aaa | 1992 | stream.next_out = buffer; |
39eea7bd | 1993 | stream.avail_out = size + 1; |
de530aaa | 1994 | |
39c68542 | 1995 | git_inflate_init(&stream); |
079afb18 | 1996 | do { |
2b87c45b | 1997 | in = use_pack(p, w_curs, curpos, &stream.avail_in); |
079afb18 | 1998 | stream.next_in = in; |
39c68542 | 1999 | st = git_inflate(&stream, Z_FINISH); |
39eea7bd JH |
2000 | if (!stream.avail_out) |
2001 | break; /* the payload is larger than it should be */ | |
2b87c45b | 2002 | curpos += stream.next_in - in; |
079afb18 | 2003 | } while (st == Z_OK || st == Z_BUF_ERROR); |
39c68542 | 2004 | git_inflate_end(&stream); |
de530aaa SP |
2005 | if ((st != Z_STREAM_END) || stream.total_out != size) { |
2006 | free(buffer); | |
2007 | return NULL; | |
2008 | } | |
2009 | ||
2010 | return buffer; | |
2011 | } | |
2012 | ||
e5e01619 LT |
2013 | #define MAX_DELTA_CACHE (256) |
2014 | ||
18bdec11 | 2015 | static size_t delta_base_cached; |
5e08ecbf NP |
2016 | |
2017 | static struct delta_base_cache_lru_list { | |
2018 | struct delta_base_cache_lru_list *prev; | |
2019 | struct delta_base_cache_lru_list *next; | |
2020 | } delta_base_cache_lru = { &delta_base_cache_lru, &delta_base_cache_lru }; | |
2021 | ||
e5e01619 | 2022 | static struct delta_base_cache_entry { |
5e08ecbf NP |
2023 | struct delta_base_cache_lru_list lru; |
2024 | void *data; | |
e5e01619 LT |
2025 | struct packed_git *p; |
2026 | off_t base_offset; | |
2027 | unsigned long size; | |
e5e01619 LT |
2028 | enum object_type type; |
2029 | } delta_base_cache[MAX_DELTA_CACHE]; | |
2030 | ||
2031 | static unsigned long pack_entry_hash(struct packed_git *p, off_t base_offset) | |
2032 | { | |
2033 | unsigned long hash; | |
2034 | ||
2035 | hash = (unsigned long)p + (unsigned long)base_offset; | |
2036 | hash += (hash >> 8) + (hash >> 16); | |
3358004a | 2037 | return hash % MAX_DELTA_CACHE; |
e5e01619 LT |
2038 | } |
2039 | ||
84dd81c1 TR |
2040 | static struct delta_base_cache_entry * |
2041 | get_delta_base_cache_entry(struct packed_git *p, off_t base_offset) | |
5266d369 JH |
2042 | { |
2043 | unsigned long hash = pack_entry_hash(p, base_offset); | |
84dd81c1 TR |
2044 | return delta_base_cache + hash; |
2045 | } | |
2046 | ||
2047 | static int eq_delta_base_cache_entry(struct delta_base_cache_entry *ent, | |
2048 | struct packed_git *p, off_t base_offset) | |
2049 | { | |
5266d369 JH |
2050 | return (ent->data && ent->p == p && ent->base_offset == base_offset); |
2051 | } | |
2052 | ||
84dd81c1 TR |
2053 | static int in_delta_base_cache(struct packed_git *p, off_t base_offset) |
2054 | { | |
2055 | struct delta_base_cache_entry *ent; | |
2056 | ent = get_delta_base_cache_entry(p, base_offset); | |
2057 | return eq_delta_base_cache_entry(ent, p, base_offset); | |
2058 | } | |
2059 | ||
2060 | static void clear_delta_base_cache_entry(struct delta_base_cache_entry *ent) | |
2061 | { | |
2062 | ent->data = NULL; | |
2063 | ent->lru.next->prev = ent->lru.prev; | |
2064 | ent->lru.prev->next = ent->lru.next; | |
2065 | delta_base_cached -= ent->size; | |
2066 | } | |
2067 | ||
62f255ad | 2068 | static void *cache_or_unpack_entry(struct packed_git *p, off_t base_offset, |
a0cba108 | 2069 | unsigned long *base_size, enum object_type *type, int keep_cache) |
62f255ad | 2070 | { |
84dd81c1 | 2071 | struct delta_base_cache_entry *ent; |
e5e01619 | 2072 | void *ret; |
e5e01619 | 2073 | |
84dd81c1 TR |
2074 | ent = get_delta_base_cache_entry(p, base_offset); |
2075 | ||
2076 | if (!eq_delta_base_cache_entry(ent, p, base_offset)) | |
749bc58c | 2077 | return unpack_entry(p, base_offset, type, base_size); |
e5e01619 | 2078 | |
84dd81c1 TR |
2079 | ret = ent->data; |
2080 | ||
2081 | if (!keep_cache) | |
2082 | clear_delta_base_cache_entry(ent); | |
2083 | else | |
182af834 | 2084 | ret = xmemdupz(ent->data, ent->size); |
e5e01619 LT |
2085 | *type = ent->type; |
2086 | *base_size = ent->size; | |
2087 | return ret; | |
62f255ad LT |
2088 | } |
2089 | ||
18bdec11 SP |
2090 | static inline void release_delta_base_cache(struct delta_base_cache_entry *ent) |
2091 | { | |
2092 | if (ent->data) { | |
2093 | free(ent->data); | |
2094 | ent->data = NULL; | |
5e08ecbf NP |
2095 | ent->lru.next->prev = ent->lru.prev; |
2096 | ent->lru.prev->next = ent->lru.next; | |
18bdec11 SP |
2097 | delta_base_cached -= ent->size; |
2098 | } | |
2099 | } | |
2100 | ||
3d20c636 SP |
2101 | void clear_delta_base_cache(void) |
2102 | { | |
2103 | unsigned long p; | |
2104 | for (p = 0; p < MAX_DELTA_CACHE; p++) | |
2105 | release_delta_base_cache(&delta_base_cache[p]); | |
2106 | } | |
2107 | ||
62f255ad LT |
2108 | static void add_delta_base_cache(struct packed_git *p, off_t base_offset, |
2109 | void *base, unsigned long base_size, enum object_type type) | |
2110 | { | |
5e08ecbf | 2111 | unsigned long hash = pack_entry_hash(p, base_offset); |
e5e01619 | 2112 | struct delta_base_cache_entry *ent = delta_base_cache + hash; |
5e08ecbf | 2113 | struct delta_base_cache_lru_list *lru; |
e5e01619 | 2114 | |
18bdec11 SP |
2115 | release_delta_base_cache(ent); |
2116 | delta_base_cached += base_size; | |
5e08ecbf NP |
2117 | |
2118 | for (lru = delta_base_cache_lru.next; | |
2119 | delta_base_cached > delta_base_cache_limit | |
2120 | && lru != &delta_base_cache_lru; | |
2121 | lru = lru->next) { | |
2122 | struct delta_base_cache_entry *f = (void *)lru; | |
18bdec11 SP |
2123 | if (f->type == OBJ_BLOB) |
2124 | release_delta_base_cache(f); | |
2125 | } | |
5e08ecbf NP |
2126 | for (lru = delta_base_cache_lru.next; |
2127 | delta_base_cached > delta_base_cache_limit | |
2128 | && lru != &delta_base_cache_lru; | |
2129 | lru = lru->next) { | |
2130 | struct delta_base_cache_entry *f = (void *)lru; | |
2131 | release_delta_base_cache(f); | |
2132 | } | |
18bdec11 | 2133 | |
e5e01619 LT |
2134 | ent->p = p; |
2135 | ent->base_offset = base_offset; | |
2136 | ent->type = type; | |
2137 | ent->data = base; | |
2138 | ent->size = base_size; | |
5e08ecbf NP |
2139 | ent->lru.next = &delta_base_cache_lru; |
2140 | ent->lru.prev = delta_base_cache_lru.prev; | |
2141 | delta_base_cache_lru.prev->next = &ent->lru; | |
2142 | delta_base_cache_lru.prev = &ent->lru; | |
62f255ad LT |
2143 | } |
2144 | ||
c2c5b270 CC |
2145 | static void *read_object(const unsigned char *sha1, enum object_type *type, |
2146 | unsigned long *size); | |
2147 | ||
5f44324d JH |
2148 | static void write_pack_access_log(struct packed_git *p, off_t obj_offset) |
2149 | { | |
67dc598e KB |
2150 | static struct trace_key pack_access = TRACE_KEY_INIT(PACK_ACCESS); |
2151 | trace_printf_key(&pack_access, "%s %"PRIuMAX"\n", | |
2152 | p->pack_name, (uintmax_t)obj_offset); | |
5f44324d JH |
2153 | } |
2154 | ||
0e8189e2 NP |
2155 | int do_check_packed_object_crc; |
2156 | ||
abe601bb TR |
2157 | #define UNPACK_ENTRY_STACK_PREALLOC 64 |
2158 | struct unpack_entry_stack_ent { | |
2159 | off_t obj_offset; | |
2160 | off_t curpos; | |
2161 | unsigned long size; | |
2162 | }; | |
2163 | ||
c4001d92 | 2164 | void *unpack_entry(struct packed_git *p, off_t obj_offset, |
abe601bb | 2165 | enum object_type *final_type, unsigned long *final_size) |
1f688557 | 2166 | { |
03e79c88 | 2167 | struct pack_window *w_curs = NULL; |
c4001d92 | 2168 | off_t curpos = obj_offset; |
abe601bb TR |
2169 | void *data = NULL; |
2170 | unsigned long size; | |
2171 | enum object_type type; | |
2172 | struct unpack_entry_stack_ent small_delta_stack[UNPACK_ENTRY_STACK_PREALLOC]; | |
2173 | struct unpack_entry_stack_ent *delta_stack = small_delta_stack; | |
2174 | int delta_stack_nr = 0, delta_stack_alloc = UNPACK_ENTRY_STACK_PREALLOC; | |
2175 | int base_from_cache = 0; | |
1f688557 | 2176 | |
67dc598e | 2177 | write_pack_access_log(p, obj_offset); |
5f44324d | 2178 | |
abe601bb TR |
2179 | /* PHASE 1: drill down to the innermost base object */ |
2180 | for (;;) { | |
2181 | off_t base_offset; | |
2182 | int i; | |
2183 | struct delta_base_cache_entry *ent; | |
2184 | ||
77965f8b NTND |
2185 | ent = get_delta_base_cache_entry(p, curpos); |
2186 | if (eq_delta_base_cache_entry(ent, p, curpos)) { | |
2187 | type = ent->type; | |
2188 | data = ent->data; | |
2189 | size = ent->size; | |
2190 | clear_delta_base_cache_entry(ent); | |
2191 | base_from_cache = 1; | |
2192 | break; | |
2193 | } | |
2194 | ||
abe601bb TR |
2195 | if (do_check_packed_object_crc && p->index_version > 1) { |
2196 | struct revindex_entry *revidx = find_pack_revindex(p, obj_offset); | |
2197 | unsigned long len = revidx[1].offset - obj_offset; | |
2198 | if (check_pack_crc(p, &w_curs, obj_offset, len, revidx->nr)) { | |
2199 | const unsigned char *sha1 = | |
2200 | nth_packed_object_sha1(p, revidx->nr); | |
2201 | error("bad packed object CRC for %s", | |
2202 | sha1_to_hex(sha1)); | |
2203 | mark_bad_packed_object(p, sha1); | |
2204 | unuse_pack(&w_curs); | |
2205 | return NULL; | |
2206 | } | |
2207 | } | |
2208 | ||
abe601bb TR |
2209 | type = unpack_object_header(p, &w_curs, &curpos, &size); |
2210 | if (type != OBJ_OFS_DELTA && type != OBJ_REF_DELTA) | |
2211 | break; | |
2212 | ||
2213 | base_offset = get_delta_base(p, &w_curs, &curpos, type, obj_offset); | |
2214 | if (!base_offset) { | |
2215 | error("failed to validate delta base reference " | |
2216 | "at offset %"PRIuMAX" from %s", | |
2217 | (uintmax_t)curpos, p->pack_name); | |
2218 | /* bail to phase 2, in hopes of recovery */ | |
2219 | data = NULL; | |
2220 | break; | |
2221 | } | |
2222 | ||
2223 | /* push object, proceed to base */ | |
2224 | if (delta_stack_nr >= delta_stack_alloc | |
2225 | && delta_stack == small_delta_stack) { | |
2226 | delta_stack_alloc = alloc_nr(delta_stack_nr); | |
2227 | delta_stack = xmalloc(sizeof(*delta_stack)*delta_stack_alloc); | |
2228 | memcpy(delta_stack, small_delta_stack, | |
2229 | sizeof(*delta_stack)*delta_stack_nr); | |
2230 | } else { | |
2231 | ALLOC_GROW(delta_stack, delta_stack_nr+1, delta_stack_alloc); | |
2232 | } | |
2233 | i = delta_stack_nr++; | |
2234 | delta_stack[i].obj_offset = obj_offset; | |
2235 | delta_stack[i].curpos = curpos; | |
2236 | delta_stack[i].size = size; | |
2237 | ||
2238 | curpos = obj_offset = base_offset; | |
0e8189e2 NP |
2239 | } |
2240 | ||
abe601bb TR |
2241 | /* PHASE 2: handle the base */ |
2242 | switch (type) { | |
eb32d236 NP |
2243 | case OBJ_OFS_DELTA: |
2244 | case OBJ_REF_DELTA: | |
abe601bb TR |
2245 | if (data) |
2246 | die("BUG in unpack_entry: left loop at a valid delta"); | |
4d703a1a | 2247 | break; |
a733cb60 | 2248 | case OBJ_COMMIT: |
a733cb60 | 2249 | case OBJ_TREE: |
a733cb60 | 2250 | case OBJ_BLOB: |
a733cb60 | 2251 | case OBJ_TAG: |
abe601bb TR |
2252 | if (!base_from_cache) |
2253 | data = unpack_compressed_entry(p, &w_curs, curpos, size); | |
4d703a1a | 2254 | break; |
1f688557 | 2255 | default: |
8eca0b47 NP |
2256 | data = NULL; |
2257 | error("unknown object type %i at offset %"PRIuMAX" in %s", | |
abe601bb TR |
2258 | type, (uintmax_t)obj_offset, p->pack_name); |
2259 | } | |
2260 | ||
2261 | /* PHASE 3: apply deltas in order */ | |
2262 | ||
2263 | /* invariants: | |
2264 | * 'data' holds the base data, or NULL if there was corruption | |
2265 | */ | |
2266 | while (delta_stack_nr) { | |
2267 | void *delta_data; | |
2268 | void *base = data; | |
2269 | unsigned long delta_size, base_size = size; | |
2270 | int i; | |
2271 | ||
2272 | data = NULL; | |
2273 | ||
2274 | if (base) | |
2275 | add_delta_base_cache(p, obj_offset, base, base_size, type); | |
2276 | ||
2277 | if (!base) { | |
2278 | /* | |
2279 | * We're probably in deep shit, but let's try to fetch | |
2280 | * the required base anyway from another pack or loose. | |
2281 | * This is costly but should happen only in the presence | |
2282 | * of a corrupted pack, and is better than failing outright. | |
2283 | */ | |
2284 | struct revindex_entry *revidx; | |
2285 | const unsigned char *base_sha1; | |
2286 | revidx = find_pack_revindex(p, obj_offset); | |
2287 | if (revidx) { | |
2288 | base_sha1 = nth_packed_object_sha1(p, revidx->nr); | |
2289 | error("failed to read delta base object %s" | |
2290 | " at offset %"PRIuMAX" from %s", | |
2291 | sha1_to_hex(base_sha1), (uintmax_t)obj_offset, | |
2292 | p->pack_name); | |
2293 | mark_bad_packed_object(p, base_sha1); | |
2294 | base = read_object(base_sha1, &type, &base_size); | |
2295 | } | |
2296 | } | |
2297 | ||
2298 | i = --delta_stack_nr; | |
2299 | obj_offset = delta_stack[i].obj_offset; | |
2300 | curpos = delta_stack[i].curpos; | |
2301 | delta_size = delta_stack[i].size; | |
2302 | ||
2303 | if (!base) | |
2304 | continue; | |
2305 | ||
2306 | delta_data = unpack_compressed_entry(p, &w_curs, curpos, delta_size); | |
2307 | ||
2308 | if (!delta_data) { | |
2309 | error("failed to unpack compressed delta " | |
2310 | "at offset %"PRIuMAX" from %s", | |
2311 | (uintmax_t)curpos, p->pack_name); | |
abe601bb TR |
2312 | data = NULL; |
2313 | continue; | |
2314 | } | |
2315 | ||
2316 | data = patch_delta(base, base_size, | |
2317 | delta_data, delta_size, | |
2318 | &size); | |
1ee886c1 JK |
2319 | |
2320 | /* | |
2321 | * We could not apply the delta; warn the user, but keep going. | |
2322 | * Our failure will be noticed either in the next iteration of | |
2323 | * the loop, or if this is the final delta, in the caller when | |
2324 | * we return NULL. Those code paths will take care of making | |
2325 | * a more explicit warning and retrying with another copy of | |
2326 | * the object. | |
2327 | */ | |
abe601bb | 2328 | if (!data) |
1ee886c1 | 2329 | error("failed to apply delta"); |
abe601bb | 2330 | |
4b8f772c | 2331 | free(delta_data); |
1f688557 | 2332 | } |
abe601bb TR |
2333 | |
2334 | *final_type = type; | |
2335 | *final_size = size; | |
2336 | ||
03e79c88 | 2337 | unuse_pack(&w_curs); |
019d1e65 NTND |
2338 | |
2339 | if (delta_stack != small_delta_stack) | |
2340 | free(delta_stack); | |
2341 | ||
21666f1a | 2342 | return data; |
1f688557 JH |
2343 | } |
2344 | ||
d079837e | 2345 | const unsigned char *nth_packed_object_sha1(struct packed_git *p, |
d72308e0 | 2346 | uint32_t n) |
9a217f2a | 2347 | { |
42873078 | 2348 | const unsigned char *index = p->index_data; |
d079837e SP |
2349 | if (!index) { |
2350 | if (open_pack_index(p)) | |
2351 | return NULL; | |
2352 | index = p->index_data; | |
2353 | } | |
57059091 | 2354 | if (n >= p->num_objects) |
d72308e0 | 2355 | return NULL; |
74e34e1f NP |
2356 | index += 4 * 256; |
2357 | if (p->index_version == 1) { | |
2358 | return index + 24 * n + 4; | |
2359 | } else { | |
2360 | index += 8; | |
2361 | return index + 20 * n; | |
2362 | } | |
2363 | } | |
2364 | ||
99093238 | 2365 | off_t nth_packed_object_offset(const struct packed_git *p, uint32_t n) |
74e34e1f NP |
2366 | { |
2367 | const unsigned char *index = p->index_data; | |
2368 | index += 4 * 256; | |
2369 | if (p->index_version == 1) { | |
2370 | return ntohl(*((uint32_t *)(index + 24 * n))); | |
2371 | } else { | |
2372 | uint32_t off; | |
2373 | index += 8 + p->num_objects * (20 + 4); | |
2374 | off = ntohl(*((uint32_t *)(index + 4 * n))); | |
2375 | if (!(off & 0x80000000)) | |
2376 | return off; | |
2377 | index += p->num_objects * 4 + (off & 0x7fffffff) * 8; | |
2378 | return (((uint64_t)ntohl(*((uint32_t *)(index + 0)))) << 32) | | |
2379 | ntohl(*((uint32_t *)(index + 4))); | |
2380 | } | |
9a217f2a JH |
2381 | } |
2382 | ||
c4001d92 | 2383 | off_t find_pack_entry_one(const unsigned char *sha1, |
43057304 | 2384 | struct packed_git *p) |
1f688557 | 2385 | { |
42873078 | 2386 | const uint32_t *level1_ofs = p->index_data; |
42873078 | 2387 | const unsigned char *index = p->index_data; |
628522ec JH |
2388 | unsigned hi, lo, stride; |
2389 | static int use_lookup = -1; | |
2390 | static int debug_lookup = -1; | |
2391 | ||
2392 | if (debug_lookup < 0) | |
2393 | debug_lookup = !!getenv("GIT_DEBUG_LOOKUP"); | |
42873078 | 2394 | |
d079837e SP |
2395 | if (!index) { |
2396 | if (open_pack_index(p)) | |
2397 | return 0; | |
2398 | level1_ofs = p->index_data; | |
2399 | index = p->index_data; | |
2400 | } | |
74e34e1f NP |
2401 | if (p->index_version > 1) { |
2402 | level1_ofs += 2; | |
2403 | index += 8; | |
2404 | } | |
42873078 | 2405 | index += 4 * 256; |
74e34e1f NP |
2406 | hi = ntohl(level1_ofs[*sha1]); |
2407 | lo = ((*sha1 == 0x0) ? 0 : ntohl(level1_ofs[*sha1 - 1])); | |
628522ec JH |
2408 | if (p->index_version > 1) { |
2409 | stride = 20; | |
2410 | } else { | |
2411 | stride = 24; | |
2412 | index += 4; | |
2413 | } | |
2414 | ||
2415 | if (debug_lookup) | |
6e1c2344 | 2416 | printf("%02x%02x%02x... lo %u hi %u nr %"PRIu32"\n", |
628522ec JH |
2417 | sha1[0], sha1[1], sha1[2], lo, hi, p->num_objects); |
2418 | ||
2419 | if (use_lookup < 0) | |
2420 | use_lookup = !!getenv("GIT_USE_LOOKUP"); | |
2421 | if (use_lookup) { | |
2422 | int pos = sha1_entry_pos(index, stride, 0, | |
2423 | lo, hi, p->num_objects, sha1); | |
2424 | if (pos < 0) | |
2425 | return 0; | |
2426 | return nth_packed_object_offset(p, pos); | |
2427 | } | |
1f688557 JH |
2428 | |
2429 | do { | |
74e34e1f | 2430 | unsigned mi = (lo + hi) / 2; |
628522ec JH |
2431 | int cmp = hashcmp(index + mi * stride, sha1); |
2432 | ||
2433 | if (debug_lookup) | |
2434 | printf("lo %u hi %u rg %u mi %u\n", | |
2435 | lo, hi, hi - lo, mi); | |
43057304 | 2436 | if (!cmp) |
74e34e1f | 2437 | return nth_packed_object_offset(p, mi); |
1f688557 JH |
2438 | if (cmp > 0) |
2439 | hi = mi; | |
2440 | else | |
2441 | lo = mi+1; | |
2442 | } while (lo < hi); | |
2443 | return 0; | |
2444 | } | |
2445 | ||
4c080182 | 2446 | int is_pack_valid(struct packed_git *p) |
d131b7af SP |
2447 | { |
2448 | /* An already open pack is known to be valid. */ | |
2449 | if (p->pack_fd != -1) | |
2450 | return 1; | |
2451 | ||
2452 | /* If the pack has one window completely covering the | |
2453 | * file size, the pack is known to be valid even if | |
2454 | * the descriptor is not currently open. | |
2455 | */ | |
2456 | if (p->windows) { | |
2457 | struct pack_window *w = p->windows; | |
2458 | ||
2459 | if (!w->offset && w->len == p->pack_size) | |
2460 | return 1; | |
2461 | } | |
2462 | ||
2463 | /* Force the pack to open to prove its valid. */ | |
2464 | return !open_packed_git(p); | |
2465 | } | |
2466 | ||
95099731 NTND |
2467 | static int fill_pack_entry(const unsigned char *sha1, |
2468 | struct pack_entry *e, | |
2469 | struct packed_git *p) | |
2470 | { | |
2471 | off_t offset; | |
2472 | ||
2473 | if (p->num_bad_objects) { | |
2474 | unsigned i; | |
2475 | for (i = 0; i < p->num_bad_objects; i++) | |
2476 | if (!hashcmp(sha1, p->bad_object_sha1 + 20 * i)) | |
2477 | return 0; | |
2478 | } | |
2479 | ||
2480 | offset = find_pack_entry_one(sha1, p); | |
2481 | if (!offset) | |
2482 | return 0; | |
2483 | ||
2484 | /* | |
2485 | * We are about to tell the caller where they can locate the | |
2486 | * requested object. We better make sure the packfile is | |
2487 | * still here and can be accessed before supplying that | |
2488 | * answer, as it may have been deleted since the index was | |
2489 | * loaded! | |
2490 | */ | |
319b678a | 2491 | if (!is_pack_valid(p)) |
95099731 | 2492 | return 0; |
95099731 NTND |
2493 | e->offset = offset; |
2494 | e->p = p; | |
2495 | hashcpy(e->sha1, sha1); | |
2496 | return 1; | |
2497 | } | |
2498 | ||
d40d535b MH |
2499 | /* |
2500 | * Iff a pack file contains the object named by sha1, return true and | |
2501 | * store its location to e. | |
2502 | */ | |
4d6acb70 | 2503 | static int find_pack_entry(const unsigned char *sha1, struct pack_entry *e) |
1f688557 JH |
2504 | { |
2505 | struct packed_git *p; | |
43057304 | 2506 | |
1f688557 | 2507 | prepare_packed_git(); |
f7c22cc6 NP |
2508 | if (!packed_git) |
2509 | return 0; | |
1f688557 | 2510 | |
c01f51cc NTND |
2511 | if (last_found_pack && fill_pack_entry(sha1, e, last_found_pack)) |
2512 | return 1; | |
8eca0b47 | 2513 | |
c01f51cc | 2514 | for (p = packed_git; p; p = p->next) { |
1b1005d1 MH |
2515 | if (p == last_found_pack) |
2516 | continue; /* we already checked this one */ | |
f7c22cc6 | 2517 | |
1b1005d1 MH |
2518 | if (fill_pack_entry(sha1, e, p)) { |
2519 | last_found_pack = p; | |
2520 | return 1; | |
2521 | } | |
c01f51cc | 2522 | } |
1f688557 JH |
2523 | return 0; |
2524 | } | |
2525 | ||
a6080a0a | 2526 | struct packed_git *find_sha1_pack(const unsigned char *sha1, |
bf592c50 DB |
2527 | struct packed_git *packs) |
2528 | { | |
2529 | struct packed_git *p; | |
bf592c50 DB |
2530 | |
2531 | for (p = packs; p; p = p->next) { | |
43057304 | 2532 | if (find_pack_entry_one(sha1, p)) |
bf592c50 DB |
2533 | return p; |
2534 | } | |
2535 | return NULL; | |
21666f1a | 2536 | |
bf592c50 DB |
2537 | } |
2538 | ||
052fe5ea | 2539 | static int sha1_loose_object_info(const unsigned char *sha1, |
23c339c0 | 2540 | struct object_info *oi) |
65c2e0c3 | 2541 | { |
36e4d74a | 2542 | int status; |
65c2e0c3 JH |
2543 | unsigned long mapsize, size; |
2544 | void *map; | |
ef49a7a0 | 2545 | git_zstream stream; |
d65a16f6 | 2546 | char hdr[32]; |
65c2e0c3 | 2547 | |
5d642e75 JK |
2548 | if (oi->delta_base_sha1) |
2549 | hashclr(oi->delta_base_sha1); | |
2550 | ||
052fe5ea JK |
2551 | /* |
2552 | * If we don't care about type or size, then we don't | |
4ef8d1dd JH |
2553 | * need to look inside the object at all. Note that we |
2554 | * do not optimize out the stat call, even if the | |
2555 | * caller doesn't care about the disk-size, since our | |
2556 | * return value implicitly indicates whether the | |
2557 | * object even exists. | |
052fe5ea | 2558 | */ |
23c339c0 | 2559 | if (!oi->typep && !oi->sizep) { |
4ef8d1dd JH |
2560 | struct stat st; |
2561 | if (stat_sha1_file(sha1, &st) < 0) | |
2562 | return -1; | |
2563 | if (oi->disk_sizep) | |
23c339c0 | 2564 | *oi->disk_sizep = st.st_size; |
052fe5ea JK |
2565 | return 0; |
2566 | } | |
2567 | ||
bb6b8e4f | 2568 | map = map_sha1_file(sha1, &mapsize); |
f0df4ed5 | 2569 | if (!map) |
dbea72a8 | 2570 | return -1; |
23c339c0 JK |
2571 | if (oi->disk_sizep) |
2572 | *oi->disk_sizep = mapsize; | |
36e4d74a JH |
2573 | if (unpack_sha1_header(&stream, map, mapsize, hdr, sizeof(hdr)) < 0) |
2574 | status = error("unable to unpack %s header", | |
2575 | sha1_to_hex(sha1)); | |
21666f1a | 2576 | else if ((status = parse_sha1_header(hdr, &size)) < 0) |
36e4d74a | 2577 | status = error("unable to parse %s header", sha1_to_hex(sha1)); |
23c339c0 JK |
2578 | else if (oi->sizep) |
2579 | *oi->sizep = size; | |
39c68542 | 2580 | git_inflate_end(&stream); |
65c2e0c3 | 2581 | munmap(map, mapsize); |
23c339c0 JK |
2582 | if (oi->typep) |
2583 | *oi->typep = status; | |
052fe5ea | 2584 | return 0; |
65c2e0c3 JH |
2585 | } |
2586 | ||
de7b5d62 | 2587 | int sha1_object_info_extended(const unsigned char *sha1, struct object_info *oi, unsigned flags) |
f0df4ed5 | 2588 | { |
c4d9986f | 2589 | struct cached_object *co; |
f0df4ed5 | 2590 | struct pack_entry e; |
5b086407 | 2591 | int rtype; |
1f7117ef | 2592 | const unsigned char *real = lookup_replace_object_extended(sha1, flags); |
f0df4ed5 | 2593 | |
1f7117ef | 2594 | co = find_cached_object(real); |
c4d9986f | 2595 | if (co) { |
5b086407 JK |
2596 | if (oi->typep) |
2597 | *(oi->typep) = co->type; | |
9a490590 JH |
2598 | if (oi->sizep) |
2599 | *(oi->sizep) = co->size; | |
161f00e7 JK |
2600 | if (oi->disk_sizep) |
2601 | *(oi->disk_sizep) = 0; | |
5d642e75 JK |
2602 | if (oi->delta_base_sha1) |
2603 | hashclr(oi->delta_base_sha1); | |
9a490590 | 2604 | oi->whence = OI_CACHED; |
5b086407 | 2605 | return 0; |
c4d9986f NTND |
2606 | } |
2607 | ||
1f7117ef | 2608 | if (!find_pack_entry(real, &e)) { |
ddd63e64 | 2609 | /* Most likely it's a loose object. */ |
1f7117ef | 2610 | if (!sha1_loose_object_info(real, oi)) { |
9a490590 | 2611 | oi->whence = OI_LOOSE; |
5b086407 | 2612 | return 0; |
9a490590 | 2613 | } |
ddd63e64 SG |
2614 | |
2615 | /* Not a loose object; someone else may have just packed it. */ | |
f0df4ed5 | 2616 | reprepare_packed_git(); |
1f7117ef | 2617 | if (!find_pack_entry(real, &e)) |
052fe5ea | 2618 | return -1; |
f0df4ed5 | 2619 | } |
3d77d877 | 2620 | |
23c339c0 | 2621 | rtype = packed_object_info(e.p, e.offset, oi); |
412916ee | 2622 | if (rtype < 0) { |
1f7117ef CC |
2623 | mark_bad_packed_object(e.p, real); |
2624 | return sha1_object_info_extended(real, oi, 0); | |
5266d369 JH |
2625 | } else if (in_delta_base_cache(e.p, e.offset)) { |
2626 | oi->whence = OI_DBCACHED; | |
9a490590 JH |
2627 | } else { |
2628 | oi->whence = OI_PACKED; | |
2629 | oi->u.packed.offset = e.offset; | |
2630 | oi->u.packed.pack = e.p; | |
2631 | oi->u.packed.is_delta = (rtype == OBJ_REF_DELTA || | |
2632 | rtype == OBJ_OFS_DELTA); | |
3d77d877 NP |
2633 | } |
2634 | ||
5b086407 | 2635 | return 0; |
f0df4ed5 JS |
2636 | } |
2637 | ||
3fc0dca9 | 2638 | /* returns enum object_type or negative */ |
9a490590 JH |
2639 | int sha1_object_info(const unsigned char *sha1, unsigned long *sizep) |
2640 | { | |
5b086407 | 2641 | enum object_type type; |
d099b717 | 2642 | struct object_info oi = {NULL}; |
9a490590 | 2643 | |
5b086407 | 2644 | oi.typep = &type; |
9a490590 | 2645 | oi.sizep = sizep; |
de7b5d62 | 2646 | if (sha1_object_info_extended(sha1, &oi, LOOKUP_REPLACE_OBJECT) < 0) |
5b086407 JK |
2647 | return -1; |
2648 | return type; | |
9a490590 JH |
2649 | } |
2650 | ||
21666f1a NP |
2651 | static void *read_packed_sha1(const unsigned char *sha1, |
2652 | enum object_type *type, unsigned long *size) | |
1f688557 JH |
2653 | { |
2654 | struct pack_entry e; | |
8eca0b47 | 2655 | void *data; |
1f688557 | 2656 | |
cd673c1f | 2657 | if (!find_pack_entry(sha1, &e)) |
1f688557 | 2658 | return NULL; |
8eca0b47 NP |
2659 | data = cache_or_unpack_entry(e.p, e.offset, size, type, 1); |
2660 | if (!data) { | |
2661 | /* | |
2662 | * We're probably in deep shit, but let's try to fetch | |
2663 | * the required object anyway from another pack or loose. | |
2664 | * This should happen only in the presence of a corrupted | |
2665 | * pack, and is better than failing outright. | |
2666 | */ | |
2667 | error("failed to read object %s at offset %"PRIuMAX" from %s", | |
2668 | sha1_to_hex(sha1), (uintmax_t)e.offset, e.p->pack_name); | |
2669 | mark_bad_packed_object(e.p, sha1); | |
ac939109 | 2670 | data = read_object(sha1, type, size); |
8eca0b47 NP |
2671 | } |
2672 | return data; | |
1f688557 JH |
2673 | } |
2674 | ||
21666f1a NP |
2675 | int pretend_sha1_file(void *buf, unsigned long len, enum object_type type, |
2676 | unsigned char *sha1) | |
d66b37bb JH |
2677 | { |
2678 | struct cached_object *co; | |
2679 | ||
21666f1a | 2680 | hash_sha1_file(buf, len, typename(type), sha1); |
d66b37bb JH |
2681 | if (has_sha1_file(sha1) || find_cached_object(sha1)) |
2682 | return 0; | |
c7353967 | 2683 | ALLOC_GROW(cached_objects, cached_object_nr + 1, cached_object_alloc); |
d66b37bb JH |
2684 | co = &cached_objects[cached_object_nr++]; |
2685 | co->size = len; | |
21666f1a | 2686 | co->type = type; |
efa13f7b JH |
2687 | co->buf = xmalloc(len); |
2688 | memcpy(co->buf, buf, len); | |
d66b37bb JH |
2689 | hashcpy(co->sha1, sha1); |
2690 | return 0; | |
2691 | } | |
2692 | ||
c2c5b270 CC |
2693 | static void *read_object(const unsigned char *sha1, enum object_type *type, |
2694 | unsigned long *size) | |
0fcfd160 LT |
2695 | { |
2696 | unsigned long mapsize; | |
2697 | void *map, *buf; | |
d66b37bb JH |
2698 | struct cached_object *co; |
2699 | ||
2700 | co = find_cached_object(sha1); | |
2701 | if (co) { | |
21666f1a | 2702 | *type = co->type; |
d66b37bb | 2703 | *size = co->size; |
182af834 | 2704 | return xmemdupz(co->buf, co->size); |
d66b37bb | 2705 | } |
0fcfd160 | 2706 | |
8276c007 PE |
2707 | buf = read_packed_sha1(sha1, type, size); |
2708 | if (buf) | |
2709 | return buf; | |
bb6b8e4f | 2710 | map = map_sha1_file(sha1, &mapsize); |
0fcfd160 | 2711 | if (map) { |
7efbff75 | 2712 | buf = unpack_sha1_file(map, mapsize, type, size, sha1); |
0fcfd160 LT |
2713 | munmap(map, mapsize); |
2714 | return buf; | |
2715 | } | |
637cdd9d | 2716 | reprepare_packed_git(); |
8276c007 | 2717 | return read_packed_sha1(sha1, type, size); |
0fcfd160 LT |
2718 | } |
2719 | ||
b6c4cecc JH |
2720 | /* |
2721 | * This function dies on corrupt objects; the callers who want to | |
2722 | * deal with them should arrange to call read_object() and give error | |
2723 | * messages themselves. | |
2724 | */ | |
5bf29b95 JH |
2725 | void *read_sha1_file_extended(const unsigned char *sha1, |
2726 | enum object_type *type, | |
2727 | unsigned long *size, | |
2728 | unsigned flag) | |
ac939109 | 2729 | { |
3ba7a065 | 2730 | void *data; |
b6c4cecc | 2731 | const struct packed_git *p; |
bf93eea0 | 2732 | const unsigned char *repl = lookup_replace_object_extended(sha1, flag); |
b6c4cecc | 2733 | |
3ba7a065 JH |
2734 | errno = 0; |
2735 | data = read_object(repl, type, size); | |
4bbf5a26 | 2736 | if (data) |
b6c4cecc | 2737 | return data; |
68095570 | 2738 | |
25f3af3f | 2739 | if (errno && errno != ENOENT) |
3ba7a065 JH |
2740 | die_errno("failed to read object %s", sha1_to_hex(sha1)); |
2741 | ||
68095570 | 2742 | /* die if we replaced an object with one that does not exist */ |
b6c4cecc | 2743 | if (repl != sha1) |
68095570 CC |
2744 | die("replacement %s not found for %s", |
2745 | sha1_to_hex(repl), sha1_to_hex(sha1)); | |
2746 | ||
b6c4cecc | 2747 | if (has_loose_object(repl)) { |
30d6c6ea MH |
2748 | const char *path = sha1_file_name(sha1); |
2749 | ||
b6c4cecc JH |
2750 | die("loose object %s (stored in %s) is corrupt", |
2751 | sha1_to_hex(repl), path); | |
e8b15e61 | 2752 | } |
68095570 | 2753 | |
b6c4cecc JH |
2754 | if ((p = has_packed_and_bad(repl)) != NULL) |
2755 | die("packed object %s (stored in %s) is corrupt", | |
2756 | sha1_to_hex(repl), p->pack_name); | |
f5552aee | 2757 | |
b6c4cecc | 2758 | return NULL; |
ac939109 NP |
2759 | } |
2760 | ||
40469ee9 | 2761 | void *read_object_with_reference(const unsigned char *sha1, |
21666f1a | 2762 | const char *required_type_name, |
40469ee9 JH |
2763 | unsigned long *size, |
2764 | unsigned char *actual_sha1_return) | |
f4913f91 | 2765 | { |
21666f1a | 2766 | enum object_type type, required_type; |
f4913f91 JH |
2767 | void *buffer; |
2768 | unsigned long isize; | |
40469ee9 | 2769 | unsigned char actual_sha1[20]; |
f4913f91 | 2770 | |
21666f1a | 2771 | required_type = type_from_string(required_type_name); |
e702496e | 2772 | hashcpy(actual_sha1, sha1); |
40469ee9 JH |
2773 | while (1) { |
2774 | int ref_length = -1; | |
2775 | const char *ref_type = NULL; | |
f4913f91 | 2776 | |
21666f1a | 2777 | buffer = read_sha1_file(actual_sha1, &type, &isize); |
40469ee9 JH |
2778 | if (!buffer) |
2779 | return NULL; | |
21666f1a | 2780 | if (type == required_type) { |
40469ee9 JH |
2781 | *size = isize; |
2782 | if (actual_sha1_return) | |
e702496e | 2783 | hashcpy(actual_sha1_return, actual_sha1); |
40469ee9 JH |
2784 | return buffer; |
2785 | } | |
2786 | /* Handle references */ | |
21666f1a | 2787 | else if (type == OBJ_COMMIT) |
40469ee9 | 2788 | ref_type = "tree "; |
21666f1a | 2789 | else if (type == OBJ_TAG) |
40469ee9 JH |
2790 | ref_type = "object "; |
2791 | else { | |
2792 | free(buffer); | |
2793 | return NULL; | |
2794 | } | |
2795 | ref_length = strlen(ref_type); | |
f4913f91 | 2796 | |
50974ec9 MK |
2797 | if (ref_length + 40 > isize || |
2798 | memcmp(buffer, ref_type, ref_length) || | |
1d7f171c | 2799 | get_sha1_hex((char *) buffer + ref_length, actual_sha1)) { |
40469ee9 JH |
2800 | free(buffer); |
2801 | return NULL; | |
2802 | } | |
1cf58e72 | 2803 | free(buffer); |
40469ee9 JH |
2804 | /* Now we have the ID of the referred-to object in |
2805 | * actual_sha1. Check again. */ | |
f4913f91 | 2806 | } |
f4913f91 JH |
2807 | } |
2808 | ||
ce9fbf16 | 2809 | static void write_sha1_file_prepare(const void *buf, unsigned long len, |
972a9155 | 2810 | const char *type, unsigned char *sha1, |
d65a16f6 | 2811 | char *hdr, int *hdrlen) |
d410c0f5 | 2812 | { |
9126f009 | 2813 | git_SHA_CTX c; |
d410c0f5 JH |
2814 | |
2815 | /* Generate the header */ | |
d65a16f6 | 2816 | *hdrlen = sprintf(hdr, "%s %lu", type, len)+1; |
d410c0f5 JH |
2817 | |
2818 | /* Sha1.. */ | |
9126f009 NP |
2819 | git_SHA1_Init(&c); |
2820 | git_SHA1_Update(&c, hdr, *hdrlen); | |
2821 | git_SHA1_Update(&c, buf, len); | |
2822 | git_SHA1_Final(sha1, &c); | |
d410c0f5 JH |
2823 | } |
2824 | ||
230f1322 | 2825 | /* |
5a688fe4 JH |
2826 | * Move the just written object into its final resting place. |
2827 | * NEEDSWORK: this should be renamed to finalize_temp_file() as | |
2828 | * "moving" is only a part of what it does, when no patch between | |
2829 | * master to pu changes the call sites of this function. | |
230f1322 | 2830 | */ |
839837b9 | 2831 | int move_temp_to_file(const char *tmpfile, const char *filename) |
230f1322 | 2832 | { |
e32c0a9c | 2833 | int ret = 0; |
5a688fe4 | 2834 | |
348df166 | 2835 | if (object_creation_mode == OBJECT_CREATION_USES_RENAMES) |
be66a6c4 JS |
2836 | goto try_rename; |
2837 | else if (link(tmpfile, filename)) | |
e32c0a9c | 2838 | ret = errno; |
7ebb6fca LT |
2839 | |
2840 | /* | |
2841 | * Coda hack - coda doesn't like cross-directory links, | |
2842 | * so we fall back to a rename, which will mean that it | |
2843 | * won't be able to check collisions, but that's not a | |
2844 | * big deal. | |
2845 | * | |
2846 | * The same holds for FAT formatted media. | |
2847 | * | |
3be1f18e | 2848 | * When this succeeds, we just return. We have nothing |
7ebb6fca LT |
2849 | * left to unlink. |
2850 | */ | |
2851 | if (ret && ret != EEXIST) { | |
be66a6c4 | 2852 | try_rename: |
7ebb6fca | 2853 | if (!rename(tmpfile, filename)) |
3be1f18e | 2854 | goto out; |
9e48b389 | 2855 | ret = errno; |
230f1322 | 2856 | } |
691f1a28 | 2857 | unlink_or_warn(tmpfile); |
230f1322 LT |
2858 | if (ret) { |
2859 | if (ret != EEXIST) { | |
82247e9b | 2860 | return error("unable to write sha1 filename %s: %s", filename, strerror(ret)); |
230f1322 LT |
2861 | } |
2862 | /* FIXME!!! Collision check here ? */ | |
2863 | } | |
2864 | ||
3be1f18e | 2865 | out: |
5256b006 | 2866 | if (adjust_shared_perm(filename)) |
5a688fe4 | 2867 | return error("unable to set permission to '%s'", filename); |
230f1322 LT |
2868 | return 0; |
2869 | } | |
2870 | ||
4d548150 LT |
2871 | static int write_buffer(int fd, const void *buf, size_t len) |
2872 | { | |
d34cf19b | 2873 | if (write_in_full(fd, buf, len) < 0) |
93822c22 | 2874 | return error("file write error (%s)", strerror(errno)); |
4d548150 LT |
2875 | return 0; |
2876 | } | |
2877 | ||
ce9fbf16 | 2878 | int hash_sha1_file(const void *buf, unsigned long len, const char *type, |
abdc3fc8 RS |
2879 | unsigned char *sha1) |
2880 | { | |
d65a16f6 | 2881 | char hdr[32]; |
abdc3fc8 RS |
2882 | int hdrlen; |
2883 | write_sha1_file_prepare(buf, len, type, sha1, hdr, &hdrlen); | |
2884 | return 0; | |
2885 | } | |
2886 | ||
e9039dd3 LT |
2887 | /* Finalize a file on disk, and close it. */ |
2888 | static void close_sha1_file(int fd) | |
2889 | { | |
aafe9fba LT |
2890 | if (fsync_object_files) |
2891 | fsync_or_die(fd, "sha1 file"); | |
e9039dd3 | 2892 | if (close(fd) != 0) |
d824cbba | 2893 | die_errno("error when closing sha1 file"); |
e9039dd3 LT |
2894 | } |
2895 | ||
5723fe7e LT |
2896 | /* Size of directory component, including the ending '/' */ |
2897 | static inline int directory_size(const char *filename) | |
2898 | { | |
2899 | const char *s = strrchr(filename, '/'); | |
2900 | if (!s) | |
2901 | return 0; | |
2902 | return s - filename + 1; | |
2903 | } | |
2904 | ||
2905 | /* | |
2906 | * This creates a temporary file in the same directory as the final | |
2907 | * 'filename' | |
2908 | * | |
2909 | * We want to avoid cross-directory filename renames, because those | |
2910 | * can have problems on various filesystems (FAT, NFS, Coda). | |
2911 | */ | |
2912 | static int create_tmpfile(char *buffer, size_t bufsiz, const char *filename) | |
2913 | { | |
2914 | int fd, dirlen = directory_size(filename); | |
2915 | ||
2916 | if (dirlen + 20 > bufsiz) { | |
2917 | errno = ENAMETOOLONG; | |
2918 | return -1; | |
2919 | } | |
2920 | memcpy(buffer, filename, dirlen); | |
2921 | strcpy(buffer + dirlen, "tmp_obj_XXXXXX"); | |
5256b006 | 2922 | fd = git_mkstemp_mode(buffer, 0444); |
cbacbf4e | 2923 | if (fd < 0 && dirlen && errno == ENOENT) { |
5723fe7e | 2924 | /* Make sure the directory exists */ |
6ff6af62 | 2925 | memcpy(buffer, filename, dirlen); |
5723fe7e | 2926 | buffer[dirlen-1] = 0; |
b2476a60 JH |
2927 | if (mkdir(buffer, 0777) && errno != EEXIST) |
2928 | return -1; | |
2929 | if (adjust_shared_perm(buffer)) | |
5723fe7e LT |
2930 | return -1; |
2931 | ||
2932 | /* Try again */ | |
2933 | strcpy(buffer + dirlen - 1, "/tmp_obj_XXXXXX"); | |
5256b006 | 2934 | fd = git_mkstemp_mode(buffer, 0444); |
5723fe7e LT |
2935 | } |
2936 | return fd; | |
2937 | } | |
2938 | ||
bbac7311 | 2939 | static int write_loose_object(const unsigned char *sha1, char *hdr, int hdrlen, |
c00e657d | 2940 | const void *buf, unsigned long len, time_t mtime) |
0fcfd160 | 2941 | { |
915308b1 | 2942 | int fd, ret; |
9892beba | 2943 | unsigned char compressed[4096]; |
ef49a7a0 | 2944 | git_zstream stream; |
748af44c NP |
2945 | git_SHA_CTX c; |
2946 | unsigned char parano_sha1[20]; | |
ab1900a3 | 2947 | static char tmp_file[PATH_MAX]; |
30d6c6ea | 2948 | const char *filename = sha1_file_name(sha1); |
a44c9a5e | 2949 | |
ab1900a3 | 2950 | fd = create_tmpfile(tmp_file, sizeof(tmp_file), filename); |
aac17941 | 2951 | if (fd < 0) { |
35243577 | 2952 | if (errno == EACCES) |
82247e9b | 2953 | return error("insufficient permission for adding an object to repository database %s", get_object_directory()); |
916d081b | 2954 | else |
5eaeda70 | 2955 | return error("unable to create temporary file: %s", strerror(errno)); |
aac17941 LT |
2956 | } |
2957 | ||
0fcfd160 | 2958 | /* Set it up */ |
55bb5c91 | 2959 | git_deflate_init(&stream, zlib_compression_level); |
0fcfd160 | 2960 | stream.next_out = compressed; |
9892beba | 2961 | stream.avail_out = sizeof(compressed); |
748af44c | 2962 | git_SHA1_Init(&c); |
a44c9a5e LT |
2963 | |
2964 | /* First header.. */ | |
d65a16f6 | 2965 | stream.next_in = (unsigned char *)hdr; |
a44c9a5e | 2966 | stream.avail_in = hdrlen; |
55bb5c91 JH |
2967 | while (git_deflate(&stream, 0) == Z_OK) |
2968 | ; /* nothing */ | |
748af44c | 2969 | git_SHA1_Update(&c, hdr, hdrlen); |
a44c9a5e LT |
2970 | |
2971 | /* Then the data itself.. */ | |
c00e657d | 2972 | stream.next_in = (void *)buf; |
a44c9a5e | 2973 | stream.avail_in = len; |
9892beba | 2974 | do { |
748af44c | 2975 | unsigned char *in0 = stream.next_in; |
55bb5c91 | 2976 | ret = git_deflate(&stream, Z_FINISH); |
748af44c | 2977 | git_SHA1_Update(&c, in0, stream.next_in - in0); |
9892beba NP |
2978 | if (write_buffer(fd, compressed, stream.next_out - compressed) < 0) |
2979 | die("unable to write sha1 file"); | |
2980 | stream.next_out = compressed; | |
2981 | stream.avail_out = sizeof(compressed); | |
2982 | } while (ret == Z_OK); | |
2983 | ||
ac54c277 LT |
2984 | if (ret != Z_STREAM_END) |
2985 | die("unable to deflate new object %s (%d)", sha1_to_hex(sha1), ret); | |
55bb5c91 | 2986 | ret = git_deflate_end_gently(&stream); |
ac54c277 LT |
2987 | if (ret != Z_OK) |
2988 | die("deflateEnd on object %s failed (%d)", sha1_to_hex(sha1), ret); | |
748af44c NP |
2989 | git_SHA1_Final(parano_sha1, &c); |
2990 | if (hashcmp(sha1, parano_sha1) != 0) | |
2991 | die("confused by unstable object source data for %s", sha1_to_hex(sha1)); | |
ac54c277 | 2992 | |
e9039dd3 | 2993 | close_sha1_file(fd); |
0fcfd160 | 2994 | |
bbac7311 NP |
2995 | if (mtime) { |
2996 | struct utimbuf utb; | |
2997 | utb.actime = mtime; | |
2998 | utb.modtime = mtime; | |
ab1900a3 | 2999 | if (utime(tmp_file, &utb) < 0) |
bbac7311 | 3000 | warning("failed utime() on %s: %s", |
ab1900a3 | 3001 | tmp_file, strerror(errno)); |
bbac7311 NP |
3002 | } |
3003 | ||
ab1900a3 | 3004 | return move_temp_to_file(tmp_file, filename); |
0fcfd160 | 3005 | } |
8237b185 | 3006 | |
33d4221c JK |
3007 | static int freshen_loose_object(const unsigned char *sha1) |
3008 | { | |
3009 | return check_and_freshen(sha1, 1); | |
3010 | } | |
3011 | ||
3012 | static int freshen_packed_object(const unsigned char *sha1) | |
3013 | { | |
3014 | struct pack_entry e; | |
ee1c6c34 JK |
3015 | if (!find_pack_entry(sha1, &e)) |
3016 | return 0; | |
3017 | if (e.p->freshened) | |
3018 | return 1; | |
3019 | if (!freshen_file(e.p->pack_name)) | |
3020 | return 0; | |
3021 | e.p->freshened = 1; | |
3022 | return 1; | |
33d4221c JK |
3023 | } |
3024 | ||
1427a7ff | 3025 | int write_sha1_file(const void *buf, unsigned long len, const char *type, unsigned char *sha1) |
bbac7311 | 3026 | { |
bbac7311 NP |
3027 | char hdr[32]; |
3028 | int hdrlen; | |
3029 | ||
3030 | /* Normally if we have it in the pack then we do not bother writing | |
3031 | * it out into .git/objects/??/?{38} file. | |
3032 | */ | |
3033 | write_sha1_file_prepare(buf, len, type, sha1, hdr, &hdrlen); | |
b5f52f37 | 3034 | if (freshen_packed_object(sha1) || freshen_loose_object(sha1)) |
bbac7311 NP |
3035 | return 0; |
3036 | return write_loose_object(sha1, hdr, hdrlen, buf, len, 0); | |
3037 | } | |
3038 | ||
0c3db67c ES |
3039 | int hash_sha1_file_literally(const void *buf, unsigned long len, const char *type, |
3040 | unsigned char *sha1, unsigned flags) | |
3041 | { | |
3042 | char *header; | |
3043 | int hdrlen, status = 0; | |
3044 | ||
3045 | /* type string, SP, %lu of the length plus NUL must fit this */ | |
3046 | header = xmalloc(strlen(type) + 32); | |
3047 | write_sha1_file_prepare(buf, len, type, sha1, header, &hdrlen); | |
3048 | ||
3049 | if (!(flags & HASH_WRITE_OBJECT)) | |
3050 | goto cleanup; | |
1e6c8bab | 3051 | if (freshen_packed_object(sha1) || freshen_loose_object(sha1)) |
0c3db67c ES |
3052 | goto cleanup; |
3053 | status = write_loose_object(sha1, header, hdrlen, buf, len, 0); | |
3054 | ||
3055 | cleanup: | |
3056 | free(header); | |
3057 | return status; | |
3058 | } | |
3059 | ||
bbac7311 NP |
3060 | int force_object_loose(const unsigned char *sha1, time_t mtime) |
3061 | { | |
bbac7311 NP |
3062 | void *buf; |
3063 | unsigned long len; | |
3064 | enum object_type type; | |
3065 | char hdr[32]; | |
3066 | int hdrlen; | |
1fb23e65 | 3067 | int ret; |
bbac7311 | 3068 | |
c529d75a | 3069 | if (has_loose_object(sha1)) |
bbac7311 NP |
3070 | return 0; |
3071 | buf = read_packed_sha1(sha1, &type, &len); | |
3072 | if (!buf) | |
3073 | return error("cannot read sha1_file for %s", sha1_to_hex(sha1)); | |
3074 | hdrlen = sprintf(hdr, "%s %lu", typename(type), len) + 1; | |
1fb23e65 BS |
3075 | ret = write_loose_object(sha1, hdr, hdrlen, buf, len, mtime); |
3076 | free(buf); | |
3077 | ||
3078 | return ret; | |
bbac7311 NP |
3079 | } |
3080 | ||
bf592c50 DB |
3081 | int has_pack_index(const unsigned char *sha1) |
3082 | { | |
3083 | struct stat st; | |
3084 | if (stat(sha1_pack_index_name(sha1), &st)) | |
3085 | return 0; | |
3086 | return 1; | |
bf592c50 DB |
3087 | } |
3088 | ||
cd673c1f JH |
3089 | int has_sha1_pack(const unsigned char *sha1) |
3090 | { | |
3091 | struct pack_entry e; | |
3092 | return find_pack_entry(sha1, &e); | |
3093 | } | |
3094 | ||
0eeb077b | 3095 | int has_sha1_file_with_flags(const unsigned char *sha1, int flags) |
8237b185 | 3096 | { |
1f688557 JH |
3097 | struct pack_entry e; |
3098 | ||
cd673c1f | 3099 | if (find_pack_entry(sha1, &e)) |
1f688557 | 3100 | return 1; |
45e8a748 JK |
3101 | if (has_loose_object(sha1)) |
3102 | return 1; | |
0eeb077b JK |
3103 | if (flags & HAS_SHA1_QUICK) |
3104 | return 0; | |
45e8a748 JK |
3105 | reprepare_packed_git(); |
3106 | return find_pack_entry(sha1, &e); | |
8237b185 | 3107 | } |
74400e71 | 3108 | |
c879daa2 NTND |
3109 | static void check_tree(const void *buf, size_t size) |
3110 | { | |
3111 | struct tree_desc desc; | |
3112 | struct name_entry entry; | |
3113 | ||
3114 | init_tree_desc(&desc, buf, size); | |
3115 | while (tree_entry(&desc, &entry)) | |
3116 | /* do nothing | |
3117 | * tree_entry() will die() on malformed entries */ | |
3118 | ; | |
3119 | } | |
3120 | ||
3121 | static void check_commit(const void *buf, size_t size) | |
3122 | { | |
3123 | struct commit c; | |
3124 | memset(&c, 0, sizeof(c)); | |
3125 | if (parse_commit_buffer(&c, buf, size)) | |
3126 | die("corrupt commit"); | |
3127 | } | |
3128 | ||
3129 | static void check_tag(const void *buf, size_t size) | |
3130 | { | |
3131 | struct tag t; | |
3132 | memset(&t, 0, sizeof(t)); | |
3133 | if (parse_tag_buffer(&t, buf, size)) | |
3134 | die("corrupt tag"); | |
3135 | } | |
3136 | ||
43df4f86 | 3137 | static int index_mem(unsigned char *sha1, void *buf, size_t size, |
c4ce46fc JH |
3138 | enum object_type type, |
3139 | const char *path, unsigned flags) | |
e7332f96 | 3140 | { |
6c510bee | 3141 | int ret, re_allocated = 0; |
c4ce46fc | 3142 | int write_object = flags & HASH_WRITE_OBJECT; |
74400e71 | 3143 | |
7672db20 | 3144 | if (!type) |
edaec3fb | 3145 | type = OBJ_BLOB; |
6c510bee LT |
3146 | |
3147 | /* | |
3148 | * Convert blobs to git internal format | |
3149 | */ | |
43df4f86 | 3150 | if ((type == OBJ_BLOB) && path) { |
f285a2d7 | 3151 | struct strbuf nbuf = STRBUF_INIT; |
21e5ad50 | 3152 | if (convert_to_git(path, buf, size, &nbuf, |
5e12e78e | 3153 | write_object ? safe_crlf : SAFE_CRLF_FALSE)) { |
b315c5c0 | 3154 | buf = strbuf_detach(&nbuf, &size); |
6c510bee LT |
3155 | re_allocated = 1; |
3156 | } | |
3157 | } | |
c4ce46fc | 3158 | if (flags & HASH_FORMAT_CHECK) { |
c879daa2 NTND |
3159 | if (type == OBJ_TREE) |
3160 | check_tree(buf, size); | |
3161 | if (type == OBJ_COMMIT) | |
3162 | check_commit(buf, size); | |
3163 | if (type == OBJ_TAG) | |
3164 | check_tag(buf, size); | |
3165 | } | |
6c510bee | 3166 | |
7672db20 | 3167 | if (write_object) |
edaec3fb | 3168 | ret = write_sha1_file(buf, size, typename(type), sha1); |
abdc3fc8 | 3169 | else |
edaec3fb | 3170 | ret = hash_sha1_file(buf, size, typename(type), sha1); |
43df4f86 | 3171 | if (re_allocated) |
6c510bee | 3172 | free(buf); |
43df4f86 DP |
3173 | return ret; |
3174 | } | |
3175 | ||
9035d75a SP |
3176 | static int index_stream_convert_blob(unsigned char *sha1, int fd, |
3177 | const char *path, unsigned flags) | |
3178 | { | |
3179 | int ret; | |
3180 | const int write_object = flags & HASH_WRITE_OBJECT; | |
3181 | struct strbuf sbuf = STRBUF_INIT; | |
3182 | ||
3183 | assert(path); | |
3184 | assert(would_convert_to_git_filter_fd(path)); | |
3185 | ||
3186 | convert_to_git_filter_fd(path, fd, &sbuf, | |
3187 | write_object ? safe_crlf : SAFE_CRLF_FALSE); | |
3188 | ||
3189 | if (write_object) | |
3190 | ret = write_sha1_file(sbuf.buf, sbuf.len, typename(OBJ_BLOB), | |
3191 | sha1); | |
3192 | else | |
3193 | ret = hash_sha1_file(sbuf.buf, sbuf.len, typename(OBJ_BLOB), | |
3194 | sha1); | |
3195 | strbuf_release(&sbuf); | |
3196 | return ret; | |
3197 | } | |
3198 | ||
7b41e1e1 JH |
3199 | static int index_pipe(unsigned char *sha1, int fd, enum object_type type, |
3200 | const char *path, unsigned flags) | |
3201 | { | |
3202 | struct strbuf sbuf = STRBUF_INIT; | |
3203 | int ret; | |
3204 | ||
3205 | if (strbuf_read(&sbuf, fd, 4096) >= 0) | |
3206 | ret = index_mem(sha1, sbuf.buf, sbuf.len, type, path, flags); | |
3207 | else | |
3208 | ret = -1; | |
3209 | strbuf_release(&sbuf); | |
3210 | return ret; | |
3211 | } | |
3212 | ||
ea68b0ce DP |
3213 | #define SMALL_FILE_SIZE (32*1024) |
3214 | ||
7b41e1e1 JH |
3215 | static int index_core(unsigned char *sha1, int fd, size_t size, |
3216 | enum object_type type, const char *path, | |
3217 | unsigned flags) | |
43df4f86 DP |
3218 | { |
3219 | int ret; | |
43df4f86 | 3220 | |
7b41e1e1 | 3221 | if (!size) { |
f6a1e1e2 | 3222 | ret = index_mem(sha1, "", size, type, path, flags); |
ea68b0ce DP |
3223 | } else if (size <= SMALL_FILE_SIZE) { |
3224 | char *buf = xmalloc(size); | |
3225 | if (size == read_in_full(fd, buf, size)) | |
c4ce46fc | 3226 | ret = index_mem(sha1, buf, size, type, path, flags); |
ea68b0ce DP |
3227 | else |
3228 | ret = error("short read %s", strerror(errno)); | |
3229 | free(buf); | |
08bda208 | 3230 | } else { |
43df4f86 | 3231 | void *buf = xmmap(NULL, size, PROT_READ, MAP_PRIVATE, fd, 0); |
c4ce46fc | 3232 | ret = index_mem(sha1, buf, size, type, path, flags); |
aac17941 | 3233 | munmap(buf, size); |
08bda208 | 3234 | } |
7b41e1e1 JH |
3235 | return ret; |
3236 | } | |
3237 | ||
4dd1fbc7 | 3238 | /* |
568508e7 JH |
3239 | * This creates one packfile per large blob unless bulk-checkin |
3240 | * machinery is "plugged". | |
4dd1fbc7 JH |
3241 | * |
3242 | * This also bypasses the usual "convert-to-git" dance, and that is on | |
3243 | * purpose. We could write a streaming version of the converting | |
3244 | * functions and insert that before feeding the data to fast-import | |
4f22b101 JK |
3245 | * (or equivalent in-core API described above). However, that is |
3246 | * somewhat complicated, as we do not know the size of the filter | |
3247 | * result, which we need to know beforehand when writing a git object. | |
3248 | * Since the primary motivation for trying to stream from the working | |
3249 | * tree file and to avoid mmaping it in core is to deal with large | |
3250 | * binary blobs, they generally do not want to get any conversion, and | |
3251 | * callers should avoid this code path when filters are requested. | |
4dd1fbc7 JH |
3252 | */ |
3253 | static int index_stream(unsigned char *sha1, int fd, size_t size, | |
3254 | enum object_type type, const char *path, | |
3255 | unsigned flags) | |
3256 | { | |
568508e7 | 3257 | return index_bulk_checkin(sha1, fd, size, type, path, flags); |
4dd1fbc7 JH |
3258 | } |
3259 | ||
7b41e1e1 JH |
3260 | int index_fd(unsigned char *sha1, int fd, struct stat *st, |
3261 | enum object_type type, const char *path, unsigned flags) | |
3262 | { | |
3263 | int ret; | |
7b41e1e1 | 3264 | |
9079ab7c SP |
3265 | /* |
3266 | * Call xsize_t() only when needed to avoid potentially unnecessary | |
3267 | * die() for large files. | |
3268 | */ | |
9035d75a SP |
3269 | if (type == OBJ_BLOB && path && would_convert_to_git_filter_fd(path)) |
3270 | ret = index_stream_convert_blob(sha1, fd, path, flags); | |
3271 | else if (!S_ISREG(st->st_mode)) | |
7b41e1e1 | 3272 | ret = index_pipe(sha1, fd, type, path, flags); |
9079ab7c | 3273 | else if (st->st_size <= big_file_threshold || type != OBJ_BLOB || |
7ce7c760 | 3274 | (path && would_convert_to_git(path))) |
9079ab7c SP |
3275 | ret = index_core(sha1, fd, xsize_t(st->st_size), type, path, |
3276 | flags); | |
4dd1fbc7 | 3277 | else |
9079ab7c SP |
3278 | ret = index_stream(sha1, fd, xsize_t(st->st_size), type, path, |
3279 | flags); | |
43df4f86 | 3280 | close(fd); |
aac17941 | 3281 | return ret; |
74400e71 | 3282 | } |
ec1fcc16 | 3283 | |
c4ce46fc | 3284 | int index_path(unsigned char *sha1, const char *path, struct stat *st, unsigned flags) |
ec1fcc16 JH |
3285 | { |
3286 | int fd; | |
b760d3aa | 3287 | struct strbuf sb = STRBUF_INIT; |
ec1fcc16 JH |
3288 | |
3289 | switch (st->st_mode & S_IFMT) { | |
3290 | case S_IFREG: | |
3291 | fd = open(path, O_RDONLY); | |
3292 | if (fd < 0) | |
3293 | return error("open(\"%s\"): %s", path, | |
3294 | strerror(errno)); | |
c4ce46fc | 3295 | if (index_fd(sha1, fd, st, OBJ_BLOB, path, flags) < 0) |
ec1fcc16 JH |
3296 | return error("%s: failed to insert into database", |
3297 | path); | |
3298 | break; | |
3299 | case S_IFLNK: | |
b760d3aa | 3300 | if (strbuf_readlink(&sb, path, st->st_size)) { |
ec1fcc16 | 3301 | char *errstr = strerror(errno); |
ec1fcc16 JH |
3302 | return error("readlink(\"%s\"): %s", path, |
3303 | errstr); | |
3304 | } | |
c4ce46fc | 3305 | if (!(flags & HASH_WRITE_OBJECT)) |
b760d3aa LT |
3306 | hash_sha1_file(sb.buf, sb.len, blob_type, sha1); |
3307 | else if (write_sha1_file(sb.buf, sb.len, blob_type, sha1)) | |
ec1fcc16 JH |
3308 | return error("%s: failed to insert into database", |
3309 | path); | |
b760d3aa | 3310 | strbuf_release(&sb); |
ec1fcc16 | 3311 | break; |
f35a6d3b LT |
3312 | case S_IFDIR: |
3313 | return resolve_gitlink_ref(path, "HEAD", sha1); | |
ec1fcc16 JH |
3314 | default: |
3315 | return error("%s: unsupported file type", path); | |
3316 | } | |
3317 | return 0; | |
3318 | } | |
a69e5429 JH |
3319 | |
3320 | int read_pack_header(int fd, struct pack_header *header) | |
3321 | { | |
c697ad14 HO |
3322 | if (read_in_full(fd, header, sizeof(*header)) < sizeof(*header)) |
3323 | /* "eof before pack header was fully read" */ | |
3324 | return PH_ERROR_EOF; | |
3325 | ||
a69e5429 JH |
3326 | if (header->hdr_signature != htonl(PACK_SIGNATURE)) |
3327 | /* "protocol error (pack signature mismatch detected)" */ | |
3328 | return PH_ERROR_PACK_SIGNATURE; | |
3329 | if (!pack_version_ok(header->hdr_version)) | |
3330 | /* "protocol error (pack version unsupported)" */ | |
3331 | return PH_ERROR_PROTOCOL; | |
3332 | return 0; | |
3333 | } | |
40d52ff7 JK |
3334 | |
3335 | void assert_sha1_type(const unsigned char *sha1, enum object_type expect) | |
3336 | { | |
3337 | enum object_type type = sha1_object_info(sha1, NULL); | |
3338 | if (type < 0) | |
3339 | die("%s is not a valid object", sha1_to_hex(sha1)); | |
3340 | if (type != expect) | |
3341 | die("%s is not a valid '%s' object", sha1_to_hex(sha1), | |
3342 | typename(expect)); | |
3343 | } | |
27e1e22d JK |
3344 | |
3345 | static int for_each_file_in_obj_subdir(int subdir_nr, | |
3346 | struct strbuf *path, | |
3347 | each_loose_object_fn obj_cb, | |
3348 | each_loose_cruft_fn cruft_cb, | |
3349 | each_loose_subdir_fn subdir_cb, | |
3350 | void *data) | |
3351 | { | |
3352 | size_t baselen = path->len; | |
3353 | DIR *dir = opendir(path->buf); | |
3354 | struct dirent *de; | |
3355 | int r = 0; | |
3356 | ||
3357 | if (!dir) { | |
3358 | if (errno == ENOENT) | |
3359 | return 0; | |
3360 | return error("unable to open %s: %s", path->buf, strerror(errno)); | |
3361 | } | |
3362 | ||
3363 | while ((de = readdir(dir))) { | |
3364 | if (is_dot_or_dotdot(de->d_name)) | |
3365 | continue; | |
3366 | ||
3367 | strbuf_setlen(path, baselen); | |
3368 | strbuf_addf(path, "/%s", de->d_name); | |
3369 | ||
3370 | if (strlen(de->d_name) == 38) { | |
3371 | char hex[41]; | |
3372 | unsigned char sha1[20]; | |
3373 | ||
3374 | snprintf(hex, sizeof(hex), "%02x%s", | |
3375 | subdir_nr, de->d_name); | |
3376 | if (!get_sha1_hex(hex, sha1)) { | |
3377 | if (obj_cb) { | |
3378 | r = obj_cb(sha1, path->buf, data); | |
3379 | if (r) | |
3380 | break; | |
3381 | } | |
3382 | continue; | |
3383 | } | |
3384 | } | |
3385 | ||
3386 | if (cruft_cb) { | |
3387 | r = cruft_cb(de->d_name, path->buf, data); | |
3388 | if (r) | |
3389 | break; | |
3390 | } | |
3391 | } | |
3392 | strbuf_setlen(path, baselen); | |
3393 | ||
3394 | if (!r && subdir_cb) | |
3395 | r = subdir_cb(subdir_nr, path->buf, data); | |
3396 | ||
3397 | closedir(dir); | |
3398 | return r; | |
3399 | } | |
3400 | ||
e6f875e0 | 3401 | int for_each_loose_file_in_objdir_buf(struct strbuf *path, |
27e1e22d JK |
3402 | each_loose_object_fn obj_cb, |
3403 | each_loose_cruft_fn cruft_cb, | |
3404 | each_loose_subdir_fn subdir_cb, | |
3405 | void *data) | |
3406 | { | |
e6f875e0 | 3407 | size_t baselen = path->len; |
27e1e22d JK |
3408 | int r = 0; |
3409 | int i; | |
3410 | ||
27e1e22d | 3411 | for (i = 0; i < 256; i++) { |
e6f875e0 JK |
3412 | strbuf_addf(path, "/%02x", i); |
3413 | r = for_each_file_in_obj_subdir(i, path, obj_cb, cruft_cb, | |
27e1e22d | 3414 | subdir_cb, data); |
e6f875e0 | 3415 | strbuf_setlen(path, baselen); |
27e1e22d JK |
3416 | if (r) |
3417 | break; | |
3418 | } | |
3419 | ||
e6f875e0 JK |
3420 | return r; |
3421 | } | |
3422 | ||
3423 | int for_each_loose_file_in_objdir(const char *path, | |
3424 | each_loose_object_fn obj_cb, | |
3425 | each_loose_cruft_fn cruft_cb, | |
3426 | each_loose_subdir_fn subdir_cb, | |
3427 | void *data) | |
3428 | { | |
3429 | struct strbuf buf = STRBUF_INIT; | |
3430 | int r; | |
3431 | ||
3432 | strbuf_addstr(&buf, path); | |
3433 | r = for_each_loose_file_in_objdir_buf(&buf, obj_cb, cruft_cb, | |
3434 | subdir_cb, data); | |
27e1e22d | 3435 | strbuf_release(&buf); |
e6f875e0 | 3436 | |
27e1e22d JK |
3437 | return r; |
3438 | } | |
660c889e JK |
3439 | |
3440 | struct loose_alt_odb_data { | |
3441 | each_loose_object_fn *cb; | |
3442 | void *data; | |
3443 | }; | |
3444 | ||
3445 | static int loose_from_alt_odb(struct alternate_object_database *alt, | |
3446 | void *vdata) | |
3447 | { | |
3448 | struct loose_alt_odb_data *data = vdata; | |
b0a42642 JM |
3449 | struct strbuf buf = STRBUF_INIT; |
3450 | int r; | |
3451 | ||
3452 | /* copy base not including trailing '/' */ | |
3453 | strbuf_add(&buf, alt->base, alt->name - alt->base - 1); | |
3454 | r = for_each_loose_file_in_objdir_buf(&buf, | |
3455 | data->cb, NULL, NULL, | |
3456 | data->data); | |
3457 | strbuf_release(&buf); | |
3458 | return r; | |
660c889e JK |
3459 | } |
3460 | ||
1385bb7b | 3461 | int for_each_loose_object(each_loose_object_fn cb, void *data, unsigned flags) |
660c889e JK |
3462 | { |
3463 | struct loose_alt_odb_data alt; | |
3464 | int r; | |
3465 | ||
3466 | r = for_each_loose_file_in_objdir(get_object_directory(), | |
3467 | cb, NULL, NULL, data); | |
3468 | if (r) | |
3469 | return r; | |
3470 | ||
1385bb7b JK |
3471 | if (flags & FOR_EACH_OBJECT_LOCAL_ONLY) |
3472 | return 0; | |
3473 | ||
660c889e JK |
3474 | alt.cb = cb; |
3475 | alt.data = data; | |
3476 | return foreach_alt_odb(loose_from_alt_odb, &alt); | |
3477 | } | |
3478 | ||
3479 | static int for_each_object_in_pack(struct packed_git *p, each_packed_object_fn cb, void *data) | |
3480 | { | |
3481 | uint32_t i; | |
3482 | int r = 0; | |
3483 | ||
3484 | for (i = 0; i < p->num_objects; i++) { | |
3485 | const unsigned char *sha1 = nth_packed_object_sha1(p, i); | |
3486 | ||
3487 | if (!sha1) | |
3488 | return error("unable to get sha1 of object %u in %s", | |
3489 | i, p->pack_name); | |
3490 | ||
3491 | r = cb(sha1, p, i, data); | |
3492 | if (r) | |
3493 | break; | |
3494 | } | |
3495 | return r; | |
3496 | } | |
3497 | ||
1385bb7b | 3498 | int for_each_packed_object(each_packed_object_fn cb, void *data, unsigned flags) |
660c889e JK |
3499 | { |
3500 | struct packed_git *p; | |
3501 | int r = 0; | |
3502 | ||
3503 | prepare_packed_git(); | |
3504 | for (p = packed_git; p; p = p->next) { | |
1385bb7b JK |
3505 | if ((flags & FOR_EACH_OBJECT_LOCAL_ONLY) && !p->pack_local) |
3506 | continue; | |
660c889e JK |
3507 | r = for_each_object_in_pack(p, cb, data); |
3508 | if (r) | |
3509 | break; | |
3510 | } | |
3511 | return r; | |
3512 | } |