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Commit | Line | Data |
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4f39cd82 | 1 | #include "cache.h" |
ec2dd32c | 2 | #include "list.h" |
0317f455 | 3 | #include "pack.h" |
031dc927 | 4 | #include "repository.h" |
0abe14f6 JT |
5 | #include "dir.h" |
6 | #include "mergesort.h" | |
7 | #include "packfile.h" | |
7b3aa75d | 8 | #include "delta.h" |
f1d8130b JT |
9 | #include "list.h" |
10 | #include "streaming.h" | |
a2551953 | 11 | #include "sha1-lookup.h" |
498f1f61 JT |
12 | #include "commit.h" |
13 | #include "object.h" | |
14 | #include "tag.h" | |
15 | #include "tree-walk.h" | |
16 | #include "tree.h" | |
0d4a1321 | 17 | #include "object-store.h" |
c4d25228 | 18 | #include "midx.h" |
5472c32c | 19 | #include "commit-graph.h" |
4f39cd82 JT |
20 | |
21 | char *odb_pack_name(struct strbuf *buf, | |
22 | const unsigned char *sha1, | |
23 | const char *ext) | |
24 | { | |
25 | strbuf_reset(buf); | |
26 | strbuf_addf(buf, "%s/pack/pack-%s.%s", get_object_directory(), | |
27 | sha1_to_hex(sha1), ext); | |
28 | return buf->buf; | |
29 | } | |
30 | ||
31 | char *sha1_pack_name(const unsigned char *sha1) | |
32 | { | |
33 | static struct strbuf buf = STRBUF_INIT; | |
34 | return odb_pack_name(&buf, sha1, "pack"); | |
35 | } | |
36 | ||
37 | char *sha1_pack_index_name(const unsigned char *sha1) | |
38 | { | |
39 | static struct strbuf buf = STRBUF_INIT; | |
40 | return odb_pack_name(&buf, sha1, "idx"); | |
41 | } | |
6d6a80e0 | 42 | |
84f80ad5 JT |
43 | static unsigned int pack_used_ctr; |
44 | static unsigned int pack_mmap_calls; | |
45 | static unsigned int peak_pack_open_windows; | |
46 | static unsigned int pack_open_windows; | |
e65f1862 | 47 | static unsigned int pack_open_fds; |
84f80ad5 JT |
48 | static unsigned int pack_max_fds; |
49 | static size_t peak_pack_mapped; | |
50 | static size_t pack_mapped; | |
8e21176c JT |
51 | |
52 | #define SZ_FMT PRIuMAX | |
53 | static inline uintmax_t sz_fmt(size_t s) { return s; } | |
54 | ||
55 | void pack_report(void) | |
56 | { | |
57 | fprintf(stderr, | |
58 | "pack_report: getpagesize() = %10" SZ_FMT "\n" | |
59 | "pack_report: core.packedGitWindowSize = %10" SZ_FMT "\n" | |
60 | "pack_report: core.packedGitLimit = %10" SZ_FMT "\n", | |
61 | sz_fmt(getpagesize()), | |
62 | sz_fmt(packed_git_window_size), | |
63 | sz_fmt(packed_git_limit)); | |
64 | fprintf(stderr, | |
65 | "pack_report: pack_used_ctr = %10u\n" | |
66 | "pack_report: pack_mmap_calls = %10u\n" | |
67 | "pack_report: pack_open_windows = %10u / %10u\n" | |
68 | "pack_report: pack_mapped = " | |
69 | "%10" SZ_FMT " / %10" SZ_FMT "\n", | |
70 | pack_used_ctr, | |
71 | pack_mmap_calls, | |
72 | pack_open_windows, peak_pack_open_windows, | |
73 | sz_fmt(pack_mapped), sz_fmt(peak_pack_mapped)); | |
74 | } | |
0317f455 JT |
75 | |
76 | /* | |
77 | * Open and mmap the index file at path, perform a couple of | |
78 | * consistency checks, then record its information to p. Return 0 on | |
79 | * success. | |
80 | */ | |
81 | static int check_packed_git_idx(const char *path, struct packed_git *p) | |
82 | { | |
83 | void *idx_map; | |
0317f455 | 84 | size_t idx_size; |
1127a98c | 85 | int fd = git_open(path), ret; |
0317f455 | 86 | struct stat st; |
37fec86a | 87 | const unsigned int hashsz = the_hash_algo->rawsz; |
0317f455 JT |
88 | |
89 | if (fd < 0) | |
90 | return -1; | |
91 | if (fstat(fd, &st)) { | |
92 | close(fd); | |
93 | return -1; | |
94 | } | |
95 | idx_size = xsize_t(st.st_size); | |
37fec86a | 96 | if (idx_size < 4 * 256 + hashsz + hashsz) { |
0317f455 JT |
97 | close(fd); |
98 | return error("index file %s is too small", path); | |
99 | } | |
100 | idx_map = xmmap(NULL, idx_size, PROT_READ, MAP_PRIVATE, fd, 0); | |
101 | close(fd); | |
102 | ||
1127a98c JS |
103 | ret = load_idx(path, hashsz, idx_map, idx_size, p); |
104 | ||
105 | if (ret) | |
106 | munmap(idx_map, idx_size); | |
107 | ||
108 | return ret; | |
109 | } | |
110 | ||
111 | int load_idx(const char *path, const unsigned int hashsz, void *idx_map, | |
112 | size_t idx_size, struct packed_git *p) | |
113 | { | |
114 | struct pack_idx_header *hdr = idx_map; | |
115 | uint32_t version, nr, i, *index; | |
116 | ||
117 | if (idx_size < 4 * 256 + hashsz + hashsz) | |
118 | return error("index file %s is too small", path); | |
119 | if (idx_map == NULL) | |
120 | return error("empty data"); | |
121 | ||
0317f455 JT |
122 | if (hdr->idx_signature == htonl(PACK_IDX_SIGNATURE)) { |
123 | version = ntohl(hdr->idx_version); | |
1127a98c | 124 | if (version < 2 || version > 2) |
0317f455 JT |
125 | return error("index file %s is version %"PRIu32 |
126 | " and is not supported by this binary" | |
127 | " (try upgrading GIT to a newer version)", | |
128 | path, version); | |
0317f455 JT |
129 | } else |
130 | version = 1; | |
131 | ||
132 | nr = 0; | |
133 | index = idx_map; | |
134 | if (version > 1) | |
135 | index += 2; /* skip index header */ | |
136 | for (i = 0; i < 256; i++) { | |
137 | uint32_t n = ntohl(index[i]); | |
1127a98c | 138 | if (n < nr) |
0317f455 | 139 | return error("non-monotonic index %s", path); |
0317f455 JT |
140 | nr = n; |
141 | } | |
142 | ||
143 | if (version == 1) { | |
144 | /* | |
145 | * Total size: | |
146 | * - 256 index entries 4 bytes each | |
37fec86a | 147 | * - 24-byte entries * nr (object ID + 4-byte offset) |
148 | * - hash of the packfile | |
149 | * - file checksum | |
0317f455 | 150 | */ |
1127a98c | 151 | if (idx_size != 4 * 256 + nr * (hashsz + 4) + hashsz + hashsz) |
0317f455 | 152 | return error("wrong index v1 file size in %s", path); |
0317f455 JT |
153 | } else if (version == 2) { |
154 | /* | |
155 | * Minimum size: | |
156 | * - 8 bytes of header | |
157 | * - 256 index entries 4 bytes each | |
37fec86a | 158 | * - object ID entry * nr |
0317f455 JT |
159 | * - 4-byte crc entry * nr |
160 | * - 4-byte offset entry * nr | |
37fec86a | 161 | * - hash of the packfile |
162 | * - file checksum | |
0317f455 JT |
163 | * And after the 4-byte offset table might be a |
164 | * variable sized table containing 8-byte entries | |
165 | * for offsets larger than 2^31. | |
166 | */ | |
37fec86a | 167 | unsigned long min_size = 8 + 4*256 + nr*(hashsz + 4 + 4) + hashsz + hashsz; |
0317f455 JT |
168 | unsigned long max_size = min_size; |
169 | if (nr) | |
170 | max_size += (nr - 1)*8; | |
1127a98c | 171 | if (idx_size < min_size || idx_size > max_size) |
0317f455 | 172 | return error("wrong index v2 file size in %s", path); |
0317f455 JT |
173 | if (idx_size != min_size && |
174 | /* | |
175 | * make sure we can deal with large pack offsets. | |
176 | * 31-bit signed offset won't be enough, neither | |
177 | * 32-bit unsigned one will be. | |
178 | */ | |
1127a98c | 179 | (sizeof(off_t) <= 4)) |
0317f455 | 180 | return error("pack too large for current definition of off_t in %s", path); |
0317f455 JT |
181 | } |
182 | ||
183 | p->index_version = version; | |
184 | p->index_data = idx_map; | |
185 | p->index_size = idx_size; | |
186 | p->num_objects = nr; | |
187 | return 0; | |
188 | } | |
189 | ||
190 | int open_pack_index(struct packed_git *p) | |
191 | { | |
192 | char *idx_name; | |
193 | size_t len; | |
194 | int ret; | |
195 | ||
196 | if (p->index_data) | |
197 | return 0; | |
198 | ||
199 | if (!strip_suffix(p->pack_name, ".pack", &len)) | |
033abf97 | 200 | BUG("pack_name does not end in .pack"); |
0317f455 JT |
201 | idx_name = xstrfmt("%.*s.idx", (int)len, p->pack_name); |
202 | ret = check_packed_git_idx(idx_name, p); | |
203 | free(idx_name); | |
204 | return ret; | |
205 | } | |
206 | ||
fe1ed56f DS |
207 | uint32_t get_pack_fanout(struct packed_git *p, uint32_t value) |
208 | { | |
209 | const uint32_t *level1_ofs = p->index_data; | |
210 | ||
211 | if (!level1_ofs) { | |
212 | if (open_pack_index(p)) | |
213 | return 0; | |
214 | level1_ofs = p->index_data; | |
215 | } | |
216 | ||
217 | if (p->index_version > 1) { | |
218 | level1_ofs += 2; | |
219 | } | |
220 | ||
221 | return ntohl(level1_ofs[value]); | |
222 | } | |
223 | ||
0317f455 JT |
224 | static struct packed_git *alloc_packed_git(int extra) |
225 | { | |
226 | struct packed_git *p = xmalloc(st_add(sizeof(*p), extra)); | |
227 | memset(p, 0, sizeof(*p)); | |
228 | p->pack_fd = -1; | |
229 | return p; | |
230 | } | |
231 | ||
232 | struct packed_git *parse_pack_index(unsigned char *sha1, const char *idx_path) | |
233 | { | |
234 | const char *path = sha1_pack_name(sha1); | |
235 | size_t alloc = st_add(strlen(path), 1); | |
236 | struct packed_git *p = alloc_packed_git(alloc); | |
237 | ||
238 | memcpy(p->pack_name, path, alloc); /* includes NUL */ | |
538b1523 | 239 | hashcpy(p->hash, sha1); |
0317f455 JT |
240 | if (check_packed_git_idx(idx_path, p)) { |
241 | free(p); | |
242 | return NULL; | |
243 | } | |
244 | ||
245 | return p; | |
246 | } | |
f0e17e86 JT |
247 | |
248 | static void scan_windows(struct packed_git *p, | |
249 | struct packed_git **lru_p, | |
250 | struct pack_window **lru_w, | |
251 | struct pack_window **lru_l) | |
252 | { | |
253 | struct pack_window *w, *w_l; | |
254 | ||
255 | for (w_l = NULL, w = p->windows; w; w = w->next) { | |
256 | if (!w->inuse_cnt) { | |
257 | if (!*lru_w || w->last_used < (*lru_w)->last_used) { | |
258 | *lru_p = p; | |
259 | *lru_w = w; | |
260 | *lru_l = w_l; | |
261 | } | |
262 | } | |
263 | w_l = w; | |
264 | } | |
265 | } | |
266 | ||
84f80ad5 | 267 | static int unuse_one_window(struct packed_git *current) |
f0e17e86 JT |
268 | { |
269 | struct packed_git *p, *lru_p = NULL; | |
270 | struct pack_window *lru_w = NULL, *lru_l = NULL; | |
271 | ||
272 | if (current) | |
273 | scan_windows(current, &lru_p, &lru_w, &lru_l); | |
a80d72db | 274 | for (p = the_repository->objects->packed_git; p; p = p->next) |
f0e17e86 JT |
275 | scan_windows(p, &lru_p, &lru_w, &lru_l); |
276 | if (lru_p) { | |
277 | munmap(lru_w->base, lru_w->len); | |
278 | pack_mapped -= lru_w->len; | |
279 | if (lru_l) | |
280 | lru_l->next = lru_w->next; | |
281 | else | |
282 | lru_p->windows = lru_w->next; | |
283 | free(lru_w); | |
284 | pack_open_windows--; | |
285 | return 1; | |
286 | } | |
287 | return 0; | |
288 | } | |
289 | ||
290 | void release_pack_memory(size_t need) | |
291 | { | |
292 | size_t cur = pack_mapped; | |
293 | while (need >= (cur - pack_mapped) && unuse_one_window(NULL)) | |
294 | ; /* nothing */ | |
295 | } | |
3836d88a JT |
296 | |
297 | void close_pack_windows(struct packed_git *p) | |
298 | { | |
299 | while (p->windows) { | |
300 | struct pack_window *w = p->windows; | |
301 | ||
302 | if (w->inuse_cnt) | |
303 | die("pack '%s' still has open windows to it", | |
304 | p->pack_name); | |
305 | munmap(w->base, w->len); | |
306 | pack_mapped -= w->len; | |
307 | pack_open_windows--; | |
308 | p->windows = w->next; | |
309 | free(w); | |
310 | } | |
311 | } | |
312 | ||
5ae18df9 | 313 | int close_pack_fd(struct packed_git *p) |
3836d88a JT |
314 | { |
315 | if (p->pack_fd < 0) | |
316 | return 0; | |
317 | ||
318 | close(p->pack_fd); | |
319 | pack_open_fds--; | |
320 | p->pack_fd = -1; | |
321 | ||
322 | return 1; | |
323 | } | |
324 | ||
325 | void close_pack_index(struct packed_git *p) | |
326 | { | |
327 | if (p->index_data) { | |
328 | munmap((void *)p->index_data, p->index_size); | |
329 | p->index_data = NULL; | |
330 | } | |
331 | } | |
332 | ||
049d51a2 | 333 | void close_pack(struct packed_git *p) |
3836d88a JT |
334 | { |
335 | close_pack_windows(p); | |
336 | close_pack_fd(p); | |
337 | close_pack_index(p); | |
338 | } | |
339 | ||
2d511cfc | 340 | void close_object_store(struct raw_object_store *o) |
3836d88a JT |
341 | { |
342 | struct packed_git *p; | |
343 | ||
d0b59866 | 344 | for (p = o->packed_git; p; p = p->next) |
3836d88a | 345 | if (p->do_not_close) |
033abf97 | 346 | BUG("want to close pack marked 'do-not-close'"); |
3836d88a JT |
347 | else |
348 | close_pack(p); | |
dc7d6643 DS |
349 | |
350 | if (o->multi_pack_index) { | |
351 | close_midx(o->multi_pack_index); | |
352 | o->multi_pack_index = NULL; | |
353 | } | |
5472c32c DS |
354 | |
355 | close_commit_graph(o); | |
3836d88a | 356 | } |
84f80ad5 JT |
357 | |
358 | /* | |
359 | * The LRU pack is the one with the oldest MRU window, preferring packs | |
360 | * with no used windows, or the oldest mtime if it has no windows allocated. | |
361 | */ | |
362 | static void find_lru_pack(struct packed_git *p, struct packed_git **lru_p, struct pack_window **mru_w, int *accept_windows_inuse) | |
363 | { | |
364 | struct pack_window *w, *this_mru_w; | |
365 | int has_windows_inuse = 0; | |
366 | ||
367 | /* | |
368 | * Reject this pack if it has windows and the previously selected | |
369 | * one does not. If this pack does not have windows, reject | |
370 | * it if the pack file is newer than the previously selected one. | |
371 | */ | |
372 | if (*lru_p && !*mru_w && (p->windows || p->mtime > (*lru_p)->mtime)) | |
373 | return; | |
374 | ||
375 | for (w = this_mru_w = p->windows; w; w = w->next) { | |
376 | /* | |
377 | * Reject this pack if any of its windows are in use, | |
378 | * but the previously selected pack did not have any | |
379 | * inuse windows. Otherwise, record that this pack | |
380 | * has windows in use. | |
381 | */ | |
382 | if (w->inuse_cnt) { | |
383 | if (*accept_windows_inuse) | |
384 | has_windows_inuse = 1; | |
385 | else | |
386 | return; | |
387 | } | |
388 | ||
389 | if (w->last_used > this_mru_w->last_used) | |
390 | this_mru_w = w; | |
391 | ||
392 | /* | |
393 | * Reject this pack if it has windows that have been | |
394 | * used more recently than the previously selected pack. | |
395 | * If the previously selected pack had windows inuse and | |
396 | * we have not encountered a window in this pack that is | |
397 | * inuse, skip this check since we prefer a pack with no | |
398 | * inuse windows to one that has inuse windows. | |
399 | */ | |
400 | if (*mru_w && *accept_windows_inuse == has_windows_inuse && | |
401 | this_mru_w->last_used > (*mru_w)->last_used) | |
402 | return; | |
403 | } | |
404 | ||
405 | /* | |
406 | * Select this pack. | |
407 | */ | |
408 | *mru_w = this_mru_w; | |
409 | *lru_p = p; | |
410 | *accept_windows_inuse = has_windows_inuse; | |
411 | } | |
412 | ||
413 | static int close_one_pack(void) | |
414 | { | |
415 | struct packed_git *p, *lru_p = NULL; | |
416 | struct pack_window *mru_w = NULL; | |
417 | int accept_windows_inuse = 1; | |
418 | ||
a80d72db | 419 | for (p = the_repository->objects->packed_git; p; p = p->next) { |
84f80ad5 JT |
420 | if (p->pack_fd == -1) |
421 | continue; | |
422 | find_lru_pack(p, &lru_p, &mru_w, &accept_windows_inuse); | |
423 | } | |
424 | ||
425 | if (lru_p) | |
426 | return close_pack_fd(lru_p); | |
427 | ||
428 | return 0; | |
429 | } | |
430 | ||
431 | static unsigned int get_max_fd_limit(void) | |
432 | { | |
433 | #ifdef RLIMIT_NOFILE | |
434 | { | |
435 | struct rlimit lim; | |
436 | ||
437 | if (!getrlimit(RLIMIT_NOFILE, &lim)) | |
438 | return lim.rlim_cur; | |
439 | } | |
440 | #endif | |
441 | ||
442 | #ifdef _SC_OPEN_MAX | |
443 | { | |
444 | long open_max = sysconf(_SC_OPEN_MAX); | |
445 | if (0 < open_max) | |
446 | return open_max; | |
447 | /* | |
448 | * Otherwise, we got -1 for one of the two | |
449 | * reasons: | |
450 | * | |
451 | * (1) sysconf() did not understand _SC_OPEN_MAX | |
452 | * and signaled an error with -1; or | |
453 | * (2) sysconf() said there is no limit. | |
454 | * | |
455 | * We _could_ clear errno before calling sysconf() to | |
456 | * tell these two cases apart and return a huge number | |
457 | * in the latter case to let the caller cap it to a | |
458 | * value that is not so selfish, but letting the | |
459 | * fallback OPEN_MAX codepath take care of these cases | |
460 | * is a lot simpler. | |
461 | */ | |
462 | } | |
463 | #endif | |
464 | ||
465 | #ifdef OPEN_MAX | |
466 | return OPEN_MAX; | |
467 | #else | |
468 | return 1; /* see the caller ;-) */ | |
469 | #endif | |
470 | } | |
471 | ||
fc789156 JK |
472 | const char *pack_basename(struct packed_git *p) |
473 | { | |
474 | const char *ret = strrchr(p->pack_name, '/'); | |
475 | if (ret) | |
476 | ret = ret + 1; /* skip past slash */ | |
477 | else | |
478 | ret = p->pack_name; /* we only have a base */ | |
479 | return ret; | |
480 | } | |
481 | ||
84f80ad5 JT |
482 | /* |
483 | * Do not call this directly as this leaks p->pack_fd on error return; | |
484 | * call open_packed_git() instead. | |
485 | */ | |
486 | static int open_packed_git_1(struct packed_git *p) | |
487 | { | |
488 | struct stat st; | |
489 | struct pack_header hdr; | |
37fec86a | 490 | unsigned char hash[GIT_MAX_RAWSZ]; |
491 | unsigned char *idx_hash; | |
84f80ad5 | 492 | long fd_flag; |
41dcc4dc | 493 | ssize_t read_result; |
37fec86a | 494 | const unsigned hashsz = the_hash_algo->rawsz; |
84f80ad5 | 495 | |
17c35c89 DS |
496 | if (!p->index_data) { |
497 | struct multi_pack_index *m; | |
fc789156 | 498 | const char *pack_name = pack_basename(p); |
17c35c89 DS |
499 | |
500 | for (m = the_repository->objects->multi_pack_index; | |
501 | m; m = m->next) { | |
502 | if (midx_contains_pack(m, pack_name)) | |
503 | break; | |
504 | } | |
505 | ||
506 | if (!m && open_pack_index(p)) | |
507 | return error("packfile %s index unavailable", p->pack_name); | |
508 | } | |
84f80ad5 JT |
509 | |
510 | if (!pack_max_fds) { | |
511 | unsigned int max_fds = get_max_fd_limit(); | |
512 | ||
513 | /* Save 3 for stdin/stdout/stderr, 22 for work */ | |
514 | if (25 < max_fds) | |
515 | pack_max_fds = max_fds - 25; | |
516 | else | |
517 | pack_max_fds = 1; | |
518 | } | |
519 | ||
520 | while (pack_max_fds <= pack_open_fds && close_one_pack()) | |
521 | ; /* nothing */ | |
522 | ||
523 | p->pack_fd = git_open(p->pack_name); | |
524 | if (p->pack_fd < 0 || fstat(p->pack_fd, &st)) | |
525 | return -1; | |
526 | pack_open_fds++; | |
527 | ||
528 | /* If we created the struct before we had the pack we lack size. */ | |
529 | if (!p->pack_size) { | |
530 | if (!S_ISREG(st.st_mode)) | |
531 | return error("packfile %s not a regular file", p->pack_name); | |
532 | p->pack_size = st.st_size; | |
533 | } else if (p->pack_size != st.st_size) | |
534 | return error("packfile %s size changed", p->pack_name); | |
535 | ||
536 | /* We leave these file descriptors open with sliding mmap; | |
537 | * there is no point keeping them open across exec(), though. | |
538 | */ | |
539 | fd_flag = fcntl(p->pack_fd, F_GETFD, 0); | |
540 | if (fd_flag < 0) | |
541 | return error("cannot determine file descriptor flags"); | |
542 | fd_flag |= FD_CLOEXEC; | |
543 | if (fcntl(p->pack_fd, F_SETFD, fd_flag) == -1) | |
544 | return error("cannot set FD_CLOEXEC"); | |
545 | ||
546 | /* Verify we recognize this pack file format. */ | |
41dcc4dc JK |
547 | read_result = read_in_full(p->pack_fd, &hdr, sizeof(hdr)); |
548 | if (read_result < 0) | |
549 | return error_errno("error reading from %s", p->pack_name); | |
550 | if (read_result != sizeof(hdr)) | |
84f80ad5 JT |
551 | return error("file %s is far too short to be a packfile", p->pack_name); |
552 | if (hdr.hdr_signature != htonl(PACK_SIGNATURE)) | |
553 | return error("file %s is not a GIT packfile", p->pack_name); | |
554 | if (!pack_version_ok(hdr.hdr_version)) | |
555 | return error("packfile %s is version %"PRIu32" and not" | |
556 | " supported (try upgrading GIT to a newer version)", | |
557 | p->pack_name, ntohl(hdr.hdr_version)); | |
558 | ||
17c35c89 DS |
559 | /* Skip index checking if in multi-pack-index */ |
560 | if (!p->index_data) | |
561 | return 0; | |
562 | ||
84f80ad5 JT |
563 | /* Verify the pack matches its index. */ |
564 | if (p->num_objects != ntohl(hdr.hdr_entries)) | |
565 | return error("packfile %s claims to have %"PRIu32" objects" | |
566 | " while index indicates %"PRIu32" objects", | |
567 | p->pack_name, ntohl(hdr.hdr_entries), | |
568 | p->num_objects); | |
37fec86a | 569 | if (lseek(p->pack_fd, p->pack_size - hashsz, SEEK_SET) == -1) |
84f80ad5 | 570 | return error("end of packfile %s is unavailable", p->pack_name); |
37fec86a | 571 | read_result = read_in_full(p->pack_fd, hash, hashsz); |
41dcc4dc JK |
572 | if (read_result < 0) |
573 | return error_errno("error reading from %s", p->pack_name); | |
37fec86a | 574 | if (read_result != hashsz) |
84f80ad5 | 575 | return error("packfile %s signature is unavailable", p->pack_name); |
37fec86a | 576 | idx_hash = ((unsigned char *)p->index_data) + p->index_size - hashsz * 2; |
67947c34 | 577 | if (!hasheq(hash, idx_hash)) |
84f80ad5 JT |
578 | return error("packfile %s does not match index", p->pack_name); |
579 | return 0; | |
580 | } | |
581 | ||
a2551953 | 582 | static int open_packed_git(struct packed_git *p) |
84f80ad5 JT |
583 | { |
584 | if (!open_packed_git_1(p)) | |
585 | return 0; | |
586 | close_pack_fd(p); | |
587 | return -1; | |
588 | } | |
589 | ||
590 | static int in_window(struct pack_window *win, off_t offset) | |
591 | { | |
37fec86a | 592 | /* We must promise at least one full hash after the |
84f80ad5 JT |
593 | * offset is available from this window, otherwise the offset |
594 | * is not actually in this window and a different window (which | |
595 | * has that one hash excess) must be used. This is to support | |
596 | * the object header and delta base parsing routines below. | |
597 | */ | |
598 | off_t win_off = win->offset; | |
599 | return win_off <= offset | |
37fec86a | 600 | && (offset + the_hash_algo->rawsz) <= (win_off + win->len); |
84f80ad5 JT |
601 | } |
602 | ||
603 | unsigned char *use_pack(struct packed_git *p, | |
604 | struct pack_window **w_cursor, | |
605 | off_t offset, | |
606 | unsigned long *left) | |
607 | { | |
608 | struct pack_window *win = *w_cursor; | |
609 | ||
610 | /* Since packfiles end in a hash of their content and it's | |
611 | * pointless to ask for an offset into the middle of that | |
612 | * hash, and the in_window function above wouldn't match | |
613 | * don't allow an offset too close to the end of the file. | |
614 | */ | |
615 | if (!p->pack_size && p->pack_fd == -1 && open_packed_git(p)) | |
616 | die("packfile %s cannot be accessed", p->pack_name); | |
37fec86a | 617 | if (offset > (p->pack_size - the_hash_algo->rawsz)) |
84f80ad5 JT |
618 | die("offset beyond end of packfile (truncated pack?)"); |
619 | if (offset < 0) | |
620 | die(_("offset before end of packfile (broken .idx?)")); | |
621 | ||
622 | if (!win || !in_window(win, offset)) { | |
623 | if (win) | |
624 | win->inuse_cnt--; | |
625 | for (win = p->windows; win; win = win->next) { | |
626 | if (in_window(win, offset)) | |
627 | break; | |
628 | } | |
629 | if (!win) { | |
630 | size_t window_align = packed_git_window_size / 2; | |
631 | off_t len; | |
632 | ||
633 | if (p->pack_fd == -1 && open_packed_git(p)) | |
634 | die("packfile %s cannot be accessed", p->pack_name); | |
635 | ||
636 | win = xcalloc(1, sizeof(*win)); | |
637 | win->offset = (offset / window_align) * window_align; | |
638 | len = p->pack_size - win->offset; | |
639 | if (len > packed_git_window_size) | |
640 | len = packed_git_window_size; | |
641 | win->len = (size_t)len; | |
642 | pack_mapped += win->len; | |
643 | while (packed_git_limit < pack_mapped | |
644 | && unuse_one_window(p)) | |
645 | ; /* nothing */ | |
3203566a | 646 | win->base = xmmap_gently(NULL, win->len, |
84f80ad5 JT |
647 | PROT_READ, MAP_PRIVATE, |
648 | p->pack_fd, win->offset); | |
649 | if (win->base == MAP_FAILED) | |
650 | die_errno("packfile %s cannot be mapped", | |
651 | p->pack_name); | |
652 | if (!win->offset && win->len == p->pack_size | |
653 | && !p->do_not_close) | |
654 | close_pack_fd(p); | |
655 | pack_mmap_calls++; | |
656 | pack_open_windows++; | |
657 | if (pack_mapped > peak_pack_mapped) | |
658 | peak_pack_mapped = pack_mapped; | |
659 | if (pack_open_windows > peak_pack_open_windows) | |
660 | peak_pack_open_windows = pack_open_windows; | |
661 | win->next = p->windows; | |
662 | p->windows = win; | |
663 | } | |
664 | } | |
665 | if (win != *w_cursor) { | |
666 | win->last_used = pack_used_ctr++; | |
667 | win->inuse_cnt++; | |
668 | *w_cursor = win; | |
669 | } | |
670 | offset -= win->offset; | |
671 | if (left) | |
672 | *left = win->len - xsize_t(offset); | |
673 | return win->base + offset; | |
674 | } | |
97de1803 JT |
675 | |
676 | void unuse_pack(struct pack_window **w_cursor) | |
677 | { | |
678 | struct pack_window *w = *w_cursor; | |
679 | if (w) { | |
680 | w->inuse_cnt--; | |
681 | *w_cursor = NULL; | |
682 | } | |
683 | } | |
9a428653 JT |
684 | |
685 | static void try_to_free_pack_memory(size_t size) | |
686 | { | |
687 | release_pack_memory(size); | |
688 | } | |
689 | ||
690 | struct packed_git *add_packed_git(const char *path, size_t path_len, int local) | |
691 | { | |
692 | static int have_set_try_to_free_routine; | |
693 | struct stat st; | |
694 | size_t alloc; | |
695 | struct packed_git *p; | |
696 | ||
697 | if (!have_set_try_to_free_routine) { | |
698 | have_set_try_to_free_routine = 1; | |
699 | set_try_to_free_routine(try_to_free_pack_memory); | |
700 | } | |
701 | ||
702 | /* | |
703 | * Make sure a corresponding .pack file exists and that | |
704 | * the index looks sane. | |
705 | */ | |
706 | if (!strip_suffix_mem(path, &path_len, ".idx")) | |
707 | return NULL; | |
708 | ||
709 | /* | |
498f1f61 | 710 | * ".promisor" is long enough to hold any suffix we're adding (and |
9a428653 JT |
711 | * the use xsnprintf double-checks that) |
712 | */ | |
498f1f61 | 713 | alloc = st_add3(path_len, strlen(".promisor"), 1); |
9a428653 JT |
714 | p = alloc_packed_git(alloc); |
715 | memcpy(p->pack_name, path, path_len); | |
716 | ||
717 | xsnprintf(p->pack_name + path_len, alloc - path_len, ".keep"); | |
718 | if (!access(p->pack_name, F_OK)) | |
719 | p->pack_keep = 1; | |
720 | ||
498f1f61 JT |
721 | xsnprintf(p->pack_name + path_len, alloc - path_len, ".promisor"); |
722 | if (!access(p->pack_name, F_OK)) | |
723 | p->pack_promisor = 1; | |
724 | ||
9a428653 JT |
725 | xsnprintf(p->pack_name + path_len, alloc - path_len, ".pack"); |
726 | if (stat(p->pack_name, &st) || !S_ISREG(st.st_mode)) { | |
727 | free(p); | |
728 | return NULL; | |
729 | } | |
730 | ||
731 | /* ok, it looks sane as far as we can check without | |
732 | * actually mapping the pack file. | |
733 | */ | |
734 | p->pack_size = st.st_size; | |
735 | p->pack_local = local; | |
736 | p->mtime = st.st_mtime; | |
37fec86a | 737 | if (path_len < the_hash_algo->hexsz || |
538b1523 | 738 | get_sha1_hex(path + path_len - the_hash_algo->hexsz, p->hash)) |
739 | hashclr(p->hash); | |
9a428653 JT |
740 | return p; |
741 | } | |
e65f1862 | 742 | |
5babff16 | 743 | void install_packed_git(struct repository *r, struct packed_git *pack) |
e65f1862 JT |
744 | { |
745 | if (pack->pack_fd != -1) | |
746 | pack_open_fds++; | |
747 | ||
5babff16 SB |
748 | pack->next = r->objects->packed_git; |
749 | r->objects->packed_git = pack; | |
e65f1862 | 750 | } |
0abe14f6 JT |
751 | |
752 | void (*report_garbage)(unsigned seen_bits, const char *path); | |
753 | ||
754 | static void report_helper(const struct string_list *list, | |
755 | int seen_bits, int first, int last) | |
756 | { | |
757 | if (seen_bits == (PACKDIR_FILE_PACK|PACKDIR_FILE_IDX)) | |
758 | return; | |
759 | ||
760 | for (; first < last; first++) | |
761 | report_garbage(seen_bits, list->items[first].string); | |
762 | } | |
763 | ||
764 | static void report_pack_garbage(struct string_list *list) | |
765 | { | |
766 | int i, baselen = -1, first = 0, seen_bits = 0; | |
767 | ||
768 | if (!report_garbage) | |
769 | return; | |
770 | ||
771 | string_list_sort(list); | |
772 | ||
773 | for (i = 0; i < list->nr; i++) { | |
774 | const char *path = list->items[i].string; | |
775 | if (baselen != -1 && | |
776 | strncmp(path, list->items[first].string, baselen)) { | |
777 | report_helper(list, seen_bits, first, i); | |
778 | baselen = -1; | |
779 | seen_bits = 0; | |
780 | } | |
781 | if (baselen == -1) { | |
782 | const char *dot = strrchr(path, '.'); | |
783 | if (!dot) { | |
784 | report_garbage(PACKDIR_FILE_GARBAGE, path); | |
785 | continue; | |
786 | } | |
787 | baselen = dot - path + 1; | |
788 | first = i; | |
789 | } | |
790 | if (!strcmp(path + baselen, "pack")) | |
791 | seen_bits |= 1; | |
792 | else if (!strcmp(path + baselen, "idx")) | |
793 | seen_bits |= 2; | |
794 | } | |
795 | report_helper(list, seen_bits, first, list->nr); | |
796 | } | |
797 | ||
9208e318 DS |
798 | void for_each_file_in_pack_dir(const char *objdir, |
799 | each_file_in_pack_dir_fn fn, | |
800 | void *data) | |
0abe14f6 JT |
801 | { |
802 | struct strbuf path = STRBUF_INIT; | |
803 | size_t dirnamelen; | |
804 | DIR *dir; | |
805 | struct dirent *de; | |
0abe14f6 JT |
806 | |
807 | strbuf_addstr(&path, objdir); | |
808 | strbuf_addstr(&path, "/pack"); | |
809 | dir = opendir(path.buf); | |
810 | if (!dir) { | |
811 | if (errno != ENOENT) | |
812 | error_errno("unable to open object pack directory: %s", | |
813 | path.buf); | |
814 | strbuf_release(&path); | |
815 | return; | |
816 | } | |
817 | strbuf_addch(&path, '/'); | |
818 | dirnamelen = path.len; | |
819 | while ((de = readdir(dir)) != NULL) { | |
0abe14f6 JT |
820 | if (is_dot_or_dotdot(de->d_name)) |
821 | continue; | |
822 | ||
823 | strbuf_setlen(&path, dirnamelen); | |
824 | strbuf_addstr(&path, de->d_name); | |
825 | ||
9208e318 | 826 | fn(path.buf, path.len, de->d_name, data); |
0abe14f6 | 827 | } |
9208e318 | 828 | |
0abe14f6 | 829 | closedir(dir); |
0abe14f6 JT |
830 | strbuf_release(&path); |
831 | } | |
832 | ||
9208e318 DS |
833 | struct prepare_pack_data { |
834 | struct repository *r; | |
835 | struct string_list *garbage; | |
836 | int local; | |
f3a002bd | 837 | struct multi_pack_index *m; |
9208e318 DS |
838 | }; |
839 | ||
840 | static void prepare_pack(const char *full_name, size_t full_name_len, | |
841 | const char *file_name, void *_data) | |
842 | { | |
843 | struct prepare_pack_data *data = (struct prepare_pack_data *)_data; | |
844 | struct packed_git *p; | |
845 | size_t base_len = full_name_len; | |
846 | ||
fe86c3be DS |
847 | if (strip_suffix_mem(full_name, &base_len, ".idx") && |
848 | !(data->m && midx_contains_pack(data->m, file_name))) { | |
9208e318 DS |
849 | /* Don't reopen a pack we already have. */ |
850 | for (p = data->r->objects->packed_git; p; p = p->next) { | |
851 | size_t len; | |
852 | if (strip_suffix(p->pack_name, ".pack", &len) && | |
853 | len == base_len && | |
854 | !memcmp(p->pack_name, full_name, len)) | |
855 | break; | |
856 | } | |
857 | ||
858 | if (!p) { | |
859 | p = add_packed_git(full_name, full_name_len, data->local); | |
860 | if (p) | |
861 | install_packed_git(data->r, p); | |
862 | } | |
863 | } | |
864 | ||
865 | if (!report_garbage) | |
866 | return; | |
867 | ||
fe86c3be DS |
868 | if (!strcmp(file_name, "multi-pack-index")) |
869 | return; | |
9208e318 DS |
870 | if (ends_with(file_name, ".idx") || |
871 | ends_with(file_name, ".pack") || | |
872 | ends_with(file_name, ".bitmap") || | |
873 | ends_with(file_name, ".keep") || | |
874 | ends_with(file_name, ".promisor")) | |
875 | string_list_append(data->garbage, full_name); | |
876 | else | |
877 | report_garbage(PACKDIR_FILE_GARBAGE, full_name); | |
878 | } | |
879 | ||
880 | static void prepare_packed_git_one(struct repository *r, char *objdir, int local) | |
881 | { | |
882 | struct prepare_pack_data data; | |
883 | struct string_list garbage = STRING_LIST_INIT_DUP; | |
884 | ||
f3a002bd DS |
885 | data.m = r->objects->multi_pack_index; |
886 | ||
887 | /* look for the multi-pack-index for this object directory */ | |
888 | while (data.m && strcmp(data.m->object_dir, objdir)) | |
889 | data.m = data.m->next; | |
890 | ||
9208e318 DS |
891 | data.r = r; |
892 | data.garbage = &garbage; | |
893 | data.local = local; | |
894 | ||
895 | for_each_file_in_pack_dir(objdir, prepare_pack, &data); | |
896 | ||
897 | report_pack_garbage(data.garbage); | |
898 | string_list_clear(data.garbage, 0); | |
899 | } | |
900 | ||
464416a2 | 901 | static void prepare_packed_git(struct repository *r); |
0abe14f6 JT |
902 | /* |
903 | * Give a fast, rough count of the number of objects in the repository. This | |
904 | * ignores loose objects completely. If you have a lot of them, then either | |
905 | * you should repack because your performance will be awful, or they are | |
906 | * all unreachable objects about to be pruned, in which case they're not really | |
907 | * interesting as a measure of repo size in the first place. | |
908 | */ | |
5038de19 | 909 | unsigned long repo_approximate_object_count(struct repository *r) |
0abe14f6 | 910 | { |
5038de19 | 911 | if (!r->objects->approximate_object_count_valid) { |
9a00580d | 912 | unsigned long count; |
b8990fbf | 913 | struct multi_pack_index *m; |
0abe14f6 JT |
914 | struct packed_git *p; |
915 | ||
5038de19 | 916 | prepare_packed_git(r); |
0abe14f6 | 917 | count = 0; |
5038de19 | 918 | for (m = get_multi_pack_index(r); m; m = m->next) |
b8990fbf | 919 | count += m->num_objects; |
5038de19 | 920 | for (p = r->objects->packed_git; p; p = p->next) { |
0abe14f6 JT |
921 | if (open_pack_index(p)) |
922 | continue; | |
923 | count += p->num_objects; | |
924 | } | |
5038de19 | 925 | r->objects->approximate_object_count = count; |
0abe14f6 | 926 | } |
5038de19 | 927 | return r->objects->approximate_object_count; |
0abe14f6 JT |
928 | } |
929 | ||
930 | static void *get_next_packed_git(const void *p) | |
931 | { | |
932 | return ((const struct packed_git *)p)->next; | |
933 | } | |
934 | ||
935 | static void set_next_packed_git(void *p, void *next) | |
936 | { | |
937 | ((struct packed_git *)p)->next = next; | |
938 | } | |
939 | ||
940 | static int sort_pack(const void *a_, const void *b_) | |
941 | { | |
942 | const struct packed_git *a = a_; | |
943 | const struct packed_git *b = b_; | |
944 | int st; | |
945 | ||
946 | /* | |
947 | * Local packs tend to contain objects specific to our | |
948 | * variant of the project than remote ones. In addition, | |
949 | * remote ones could be on a network mounted filesystem. | |
950 | * Favor local ones for these reasons. | |
951 | */ | |
952 | st = a->pack_local - b->pack_local; | |
953 | if (st) | |
954 | return -st; | |
955 | ||
956 | /* | |
957 | * Younger packs tend to contain more recent objects, | |
958 | * and more recent objects tend to get accessed more | |
959 | * often. | |
960 | */ | |
961 | if (a->mtime < b->mtime) | |
962 | return 1; | |
963 | else if (a->mtime == b->mtime) | |
964 | return 0; | |
965 | return -1; | |
966 | } | |
967 | ||
c235beac | 968 | static void rearrange_packed_git(struct repository *r) |
0abe14f6 | 969 | { |
c235beac SB |
970 | r->objects->packed_git = llist_mergesort( |
971 | r->objects->packed_git, get_next_packed_git, | |
a80d72db | 972 | set_next_packed_git, sort_pack); |
0abe14f6 JT |
973 | } |
974 | ||
804be796 | 975 | static void prepare_packed_git_mru(struct repository *r) |
0abe14f6 JT |
976 | { |
977 | struct packed_git *p; | |
978 | ||
804be796 | 979 | INIT_LIST_HEAD(&r->objects->packed_git_mru); |
ec2dd32c | 980 | |
804be796 SB |
981 | for (p = r->objects->packed_git; p; p = p->next) |
982 | list_add_tail(&p->mru, &r->objects->packed_git_mru); | |
0abe14f6 JT |
983 | } |
984 | ||
464416a2 | 985 | static void prepare_packed_git(struct repository *r) |
0abe14f6 | 986 | { |
263db403 | 987 | struct object_directory *odb; |
0abe14f6 | 988 | |
0f90a9f2 | 989 | if (r->objects->packed_git_initialized) |
0abe14f6 | 990 | return; |
f0eaf638 | 991 | |
0f90a9f2 | 992 | prepare_alt_odb(r); |
f0eaf638 JK |
993 | for (odb = r->objects->odb; odb; odb = odb->next) { |
994 | int local = (odb == r->objects->odb); | |
995 | prepare_multi_pack_index_one(r, odb->path, local); | |
996 | prepare_packed_git_one(r, odb->path, local); | |
c4d25228 | 997 | } |
0f90a9f2 | 998 | rearrange_packed_git(r); |
0bff5269 | 999 | |
0f90a9f2 SB |
1000 | prepare_packed_git_mru(r); |
1001 | r->objects->packed_git_initialized = 1; | |
0abe14f6 JT |
1002 | } |
1003 | ||
4c2a13b4 | 1004 | void reprepare_packed_git(struct repository *r) |
0abe14f6 | 1005 | { |
3a2e0824 JK |
1006 | struct object_directory *odb; |
1007 | ||
d4e19e51 RS |
1008 | for (odb = r->objects->odb; odb; odb = odb->next) |
1009 | odb_clear_loose_cache(odb); | |
3a2e0824 | 1010 | |
4c2a13b4 SB |
1011 | r->objects->approximate_object_count_valid = 0; |
1012 | r->objects->packed_git_initialized = 0; | |
1013 | prepare_packed_git(r); | |
0abe14f6 | 1014 | } |
32b42e15 | 1015 | |
a80d72db SB |
1016 | struct packed_git *get_packed_git(struct repository *r) |
1017 | { | |
464416a2 | 1018 | prepare_packed_git(r); |
a80d72db SB |
1019 | return r->objects->packed_git; |
1020 | } | |
1021 | ||
8aac67a1 DS |
1022 | struct multi_pack_index *get_multi_pack_index(struct repository *r) |
1023 | { | |
1024 | prepare_packed_git(r); | |
1025 | return r->objects->multi_pack_index; | |
1026 | } | |
1027 | ||
0bff5269 DS |
1028 | struct packed_git *get_all_packs(struct repository *r) |
1029 | { | |
af96fe33 | 1030 | struct multi_pack_index *m; |
0bff5269 | 1031 | |
af96fe33 DS |
1032 | prepare_packed_git(r); |
1033 | for (m = r->objects->multi_pack_index; m; m = m->next) { | |
1034 | uint32_t i; | |
1035 | for (i = 0; i < m->num_packs; i++) | |
1036 | prepare_midx_pack(r, m, i); | |
0bff5269 DS |
1037 | } |
1038 | ||
af96fe33 | 1039 | return r->objects->packed_git; |
0bff5269 DS |
1040 | } |
1041 | ||
a80d72db SB |
1042 | struct list_head *get_packed_git_mru(struct repository *r) |
1043 | { | |
464416a2 | 1044 | prepare_packed_git(r); |
a80d72db SB |
1045 | return &r->objects->packed_git_mru; |
1046 | } | |
1047 | ||
32b42e15 JT |
1048 | unsigned long unpack_object_header_buffer(const unsigned char *buf, |
1049 | unsigned long len, enum object_type *type, unsigned long *sizep) | |
1050 | { | |
1051 | unsigned shift; | |
1052 | unsigned long size, c; | |
1053 | unsigned long used = 0; | |
1054 | ||
1055 | c = buf[used++]; | |
1056 | *type = (c >> 4) & 7; | |
1057 | size = c & 15; | |
1058 | shift = 4; | |
1059 | while (c & 0x80) { | |
1060 | if (len <= used || bitsizeof(long) <= shift) { | |
1061 | error("bad object header"); | |
1062 | size = used = 0; | |
1063 | break; | |
1064 | } | |
1065 | c = buf[used++]; | |
1066 | size += (c & 0x7f) << shift; | |
1067 | shift += 7; | |
1068 | } | |
1069 | *sizep = size; | |
1070 | return used; | |
1071 | } | |
7b3aa75d JT |
1072 | |
1073 | unsigned long get_size_from_delta(struct packed_git *p, | |
1074 | struct pack_window **w_curs, | |
1075 | off_t curpos) | |
1076 | { | |
1077 | const unsigned char *data; | |
1078 | unsigned char delta_head[20], *in; | |
1079 | git_zstream stream; | |
1080 | int st; | |
1081 | ||
1082 | memset(&stream, 0, sizeof(stream)); | |
1083 | stream.next_out = delta_head; | |
1084 | stream.avail_out = sizeof(delta_head); | |
1085 | ||
1086 | git_inflate_init(&stream); | |
1087 | do { | |
1088 | in = use_pack(p, w_curs, curpos, &stream.avail_in); | |
1089 | stream.next_in = in; | |
1090 | st = git_inflate(&stream, Z_FINISH); | |
1091 | curpos += stream.next_in - in; | |
1092 | } while ((st == Z_OK || st == Z_BUF_ERROR) && | |
1093 | stream.total_out < sizeof(delta_head)); | |
1094 | git_inflate_end(&stream); | |
1095 | if ((st != Z_STREAM_END) && stream.total_out != sizeof(delta_head)) { | |
1096 | error("delta data unpack-initial failed"); | |
1097 | return 0; | |
1098 | } | |
1099 | ||
1100 | /* Examine the initial part of the delta to figure out | |
1101 | * the result size. | |
1102 | */ | |
1103 | data = delta_head; | |
1104 | ||
1105 | /* ignore base size */ | |
1106 | get_delta_hdr_size(&data, delta_head+sizeof(delta_head)); | |
1107 | ||
1108 | /* Read the result size */ | |
1109 | return get_delta_hdr_size(&data, delta_head+sizeof(delta_head)); | |
1110 | } | |
3588dd6e JT |
1111 | |
1112 | int unpack_object_header(struct packed_git *p, | |
1113 | struct pack_window **w_curs, | |
1114 | off_t *curpos, | |
1115 | unsigned long *sizep) | |
1116 | { | |
1117 | unsigned char *base; | |
1118 | unsigned long left; | |
1119 | unsigned long used; | |
1120 | enum object_type type; | |
1121 | ||
1122 | /* use_pack() assures us we have [base, base + 20) available | |
1123 | * as a range that we can look at. (Its actually the hash | |
1124 | * size that is assured.) With our object header encoding | |
1125 | * the maximum deflated object size is 2^137, which is just | |
1126 | * insane, so we know won't exceed what we have been given. | |
1127 | */ | |
1128 | base = use_pack(p, w_curs, *curpos, &left); | |
1129 | used = unpack_object_header_buffer(base, left, &type, sizep); | |
1130 | if (!used) { | |
1131 | type = OBJ_BAD; | |
1132 | } else | |
1133 | *curpos += used; | |
1134 | ||
1135 | return type; | |
1136 | } | |
f1d8130b JT |
1137 | |
1138 | void mark_bad_packed_object(struct packed_git *p, const unsigned char *sha1) | |
1139 | { | |
1140 | unsigned i; | |
268babd6 | 1141 | const unsigned hashsz = the_hash_algo->rawsz; |
f1d8130b | 1142 | for (i = 0; i < p->num_bad_objects; i++) |
268babd6 | 1143 | if (hasheq(sha1, p->bad_object_sha1 + hashsz * i)) |
f1d8130b JT |
1144 | return; |
1145 | p->bad_object_sha1 = xrealloc(p->bad_object_sha1, | |
1146 | st_mult(GIT_MAX_RAWSZ, | |
1147 | st_add(p->num_bad_objects, 1))); | |
268babd6 | 1148 | hashcpy(p->bad_object_sha1 + hashsz * p->num_bad_objects, sha1); |
f1d8130b JT |
1149 | p->num_bad_objects++; |
1150 | } | |
1151 | ||
33b94066 SB |
1152 | const struct packed_git *has_packed_and_bad(struct repository *r, |
1153 | const unsigned char *sha1) | |
f1d8130b JT |
1154 | { |
1155 | struct packed_git *p; | |
1156 | unsigned i; | |
1157 | ||
33b94066 | 1158 | for (p = r->objects->packed_git; p; p = p->next) |
f1d8130b | 1159 | for (i = 0; i < p->num_bad_objects; i++) |
e3ff0683 JK |
1160 | if (hasheq(sha1, |
1161 | p->bad_object_sha1 + the_hash_algo->rawsz * i)) | |
f1d8130b JT |
1162 | return p; |
1163 | return NULL; | |
1164 | } | |
1165 | ||
1166 | static off_t get_delta_base(struct packed_git *p, | |
1167 | struct pack_window **w_curs, | |
1168 | off_t *curpos, | |
1169 | enum object_type type, | |
1170 | off_t delta_obj_offset) | |
1171 | { | |
1172 | unsigned char *base_info = use_pack(p, w_curs, *curpos, NULL); | |
1173 | off_t base_offset; | |
1174 | ||
1175 | /* use_pack() assured us we have [base_info, base_info + 20) | |
1176 | * as a range that we can look at without walking off the | |
1177 | * end of the mapped window. Its actually the hash size | |
1178 | * that is assured. An OFS_DELTA longer than the hash size | |
1179 | * is stupid, as then a REF_DELTA would be smaller to store. | |
1180 | */ | |
1181 | if (type == OBJ_OFS_DELTA) { | |
1182 | unsigned used = 0; | |
1183 | unsigned char c = base_info[used++]; | |
1184 | base_offset = c & 127; | |
1185 | while (c & 128) { | |
1186 | base_offset += 1; | |
1187 | if (!base_offset || MSB(base_offset, 7)) | |
1188 | return 0; /* overflow */ | |
1189 | c = base_info[used++]; | |
1190 | base_offset = (base_offset << 7) + (c & 127); | |
1191 | } | |
1192 | base_offset = delta_obj_offset - base_offset; | |
1193 | if (base_offset <= 0 || base_offset >= delta_obj_offset) | |
1194 | return 0; /* out of bound */ | |
1195 | *curpos += used; | |
1196 | } else if (type == OBJ_REF_DELTA) { | |
1197 | /* The base entry _must_ be in the same pack */ | |
1198 | base_offset = find_pack_entry_one(base_info, p); | |
37fec86a | 1199 | *curpos += the_hash_algo->rawsz; |
f1d8130b JT |
1200 | } else |
1201 | die("I am totally screwed"); | |
1202 | return base_offset; | |
1203 | } | |
1204 | ||
1205 | /* | |
1206 | * Like get_delta_base above, but we return the sha1 instead of the pack | |
1207 | * offset. This means it is cheaper for REF deltas (we do not have to do | |
1208 | * the final object lookup), but more expensive for OFS deltas (we | |
1209 | * have to load the revidx to convert the offset back into a sha1). | |
1210 | */ | |
1211 | static const unsigned char *get_delta_base_sha1(struct packed_git *p, | |
1212 | struct pack_window **w_curs, | |
1213 | off_t curpos, | |
1214 | enum object_type type, | |
1215 | off_t delta_obj_offset) | |
1216 | { | |
1217 | if (type == OBJ_REF_DELTA) { | |
1218 | unsigned char *base = use_pack(p, w_curs, curpos, NULL); | |
1219 | return base; | |
1220 | } else if (type == OBJ_OFS_DELTA) { | |
1221 | struct revindex_entry *revidx; | |
1222 | off_t base_offset = get_delta_base(p, w_curs, &curpos, | |
1223 | type, delta_obj_offset); | |
1224 | ||
1225 | if (!base_offset) | |
1226 | return NULL; | |
1227 | ||
1228 | revidx = find_pack_revindex(p, base_offset); | |
1229 | if (!revidx) | |
1230 | return NULL; | |
1231 | ||
1232 | return nth_packed_object_sha1(p, revidx->nr); | |
1233 | } else | |
1234 | return NULL; | |
1235 | } | |
1236 | ||
9d98354f SB |
1237 | static int retry_bad_packed_offset(struct repository *r, |
1238 | struct packed_git *p, | |
1239 | off_t obj_offset) | |
f1d8130b JT |
1240 | { |
1241 | int type; | |
1242 | struct revindex_entry *revidx; | |
d169d664 | 1243 | struct object_id oid; |
f1d8130b JT |
1244 | revidx = find_pack_revindex(p, obj_offset); |
1245 | if (!revidx) | |
1246 | return OBJ_BAD; | |
d169d664 | 1247 | nth_packed_object_oid(&oid, p, revidx->nr); |
1248 | mark_bad_packed_object(p, oid.hash); | |
9d98354f | 1249 | type = oid_object_info(r, &oid, NULL); |
f1d8130b JT |
1250 | if (type <= OBJ_NONE) |
1251 | return OBJ_BAD; | |
1252 | return type; | |
1253 | } | |
1254 | ||
1255 | #define POI_STACK_PREALLOC 64 | |
1256 | ||
9d98354f SB |
1257 | static enum object_type packed_to_object_type(struct repository *r, |
1258 | struct packed_git *p, | |
f1d8130b JT |
1259 | off_t obj_offset, |
1260 | enum object_type type, | |
1261 | struct pack_window **w_curs, | |
1262 | off_t curpos) | |
1263 | { | |
1264 | off_t small_poi_stack[POI_STACK_PREALLOC]; | |
1265 | off_t *poi_stack = small_poi_stack; | |
1266 | int poi_stack_nr = 0, poi_stack_alloc = POI_STACK_PREALLOC; | |
1267 | ||
1268 | while (type == OBJ_OFS_DELTA || type == OBJ_REF_DELTA) { | |
1269 | off_t base_offset; | |
1270 | unsigned long size; | |
1271 | /* Push the object we're going to leave behind */ | |
1272 | if (poi_stack_nr >= poi_stack_alloc && poi_stack == small_poi_stack) { | |
1273 | poi_stack_alloc = alloc_nr(poi_stack_nr); | |
1274 | ALLOC_ARRAY(poi_stack, poi_stack_alloc); | |
921d49be | 1275 | COPY_ARRAY(poi_stack, small_poi_stack, poi_stack_nr); |
f1d8130b JT |
1276 | } else { |
1277 | ALLOC_GROW(poi_stack, poi_stack_nr+1, poi_stack_alloc); | |
1278 | } | |
1279 | poi_stack[poi_stack_nr++] = obj_offset; | |
1280 | /* If parsing the base offset fails, just unwind */ | |
1281 | base_offset = get_delta_base(p, w_curs, &curpos, type, obj_offset); | |
1282 | if (!base_offset) | |
1283 | goto unwind; | |
1284 | curpos = obj_offset = base_offset; | |
1285 | type = unpack_object_header(p, w_curs, &curpos, &size); | |
1286 | if (type <= OBJ_NONE) { | |
1287 | /* If getting the base itself fails, we first | |
1288 | * retry the base, otherwise unwind */ | |
9d98354f | 1289 | type = retry_bad_packed_offset(r, p, base_offset); |
f1d8130b JT |
1290 | if (type > OBJ_NONE) |
1291 | goto out; | |
1292 | goto unwind; | |
1293 | } | |
1294 | } | |
1295 | ||
1296 | switch (type) { | |
1297 | case OBJ_BAD: | |
1298 | case OBJ_COMMIT: | |
1299 | case OBJ_TREE: | |
1300 | case OBJ_BLOB: | |
1301 | case OBJ_TAG: | |
1302 | break; | |
1303 | default: | |
1304 | error("unknown object type %i at offset %"PRIuMAX" in %s", | |
1305 | type, (uintmax_t)obj_offset, p->pack_name); | |
1306 | type = OBJ_BAD; | |
1307 | } | |
1308 | ||
1309 | out: | |
1310 | if (poi_stack != small_poi_stack) | |
1311 | free(poi_stack); | |
1312 | return type; | |
1313 | ||
1314 | unwind: | |
1315 | while (poi_stack_nr) { | |
1316 | obj_offset = poi_stack[--poi_stack_nr]; | |
9d98354f | 1317 | type = retry_bad_packed_offset(r, p, obj_offset); |
f1d8130b JT |
1318 | if (type > OBJ_NONE) |
1319 | goto out; | |
1320 | } | |
1321 | type = OBJ_BAD; | |
1322 | goto out; | |
1323 | } | |
1324 | ||
1325 | static struct hashmap delta_base_cache; | |
1326 | static size_t delta_base_cached; | |
1327 | ||
1328 | static LIST_HEAD(delta_base_cache_lru); | |
1329 | ||
1330 | struct delta_base_cache_key { | |
1331 | struct packed_git *p; | |
1332 | off_t base_offset; | |
1333 | }; | |
1334 | ||
1335 | struct delta_base_cache_entry { | |
1336 | struct hashmap hash; | |
1337 | struct delta_base_cache_key key; | |
1338 | struct list_head lru; | |
1339 | void *data; | |
1340 | unsigned long size; | |
1341 | enum object_type type; | |
1342 | }; | |
1343 | ||
1344 | static unsigned int pack_entry_hash(struct packed_git *p, off_t base_offset) | |
1345 | { | |
1346 | unsigned int hash; | |
1347 | ||
1348 | hash = (unsigned int)(intptr_t)p + (unsigned int)base_offset; | |
1349 | hash += (hash >> 8) + (hash >> 16); | |
1350 | return hash; | |
1351 | } | |
1352 | ||
1353 | static struct delta_base_cache_entry * | |
1354 | get_delta_base_cache_entry(struct packed_git *p, off_t base_offset) | |
1355 | { | |
1356 | struct hashmap_entry entry; | |
1357 | struct delta_base_cache_key key; | |
1358 | ||
1359 | if (!delta_base_cache.cmpfn) | |
1360 | return NULL; | |
1361 | ||
1362 | hashmap_entry_init(&entry, pack_entry_hash(p, base_offset)); | |
1363 | key.p = p; | |
1364 | key.base_offset = base_offset; | |
1365 | return hashmap_get(&delta_base_cache, &entry, &key); | |
1366 | } | |
1367 | ||
1368 | static int delta_base_cache_key_eq(const struct delta_base_cache_key *a, | |
1369 | const struct delta_base_cache_key *b) | |
1370 | { | |
1371 | return a->p == b->p && a->base_offset == b->base_offset; | |
1372 | } | |
1373 | ||
1374 | static int delta_base_cache_hash_cmp(const void *unused_cmp_data, | |
1375 | const void *va, const void *vb, | |
1376 | const void *vkey) | |
1377 | { | |
1378 | const struct delta_base_cache_entry *a = va, *b = vb; | |
1379 | const struct delta_base_cache_key *key = vkey; | |
1380 | if (key) | |
1381 | return !delta_base_cache_key_eq(&a->key, key); | |
1382 | else | |
1383 | return !delta_base_cache_key_eq(&a->key, &b->key); | |
1384 | } | |
1385 | ||
1386 | static int in_delta_base_cache(struct packed_git *p, off_t base_offset) | |
1387 | { | |
1388 | return !!get_delta_base_cache_entry(p, base_offset); | |
1389 | } | |
1390 | ||
1391 | /* | |
1392 | * Remove the entry from the cache, but do _not_ free the associated | |
1393 | * entry data. The caller takes ownership of the "data" buffer, and | |
1394 | * should copy out any fields it wants before detaching. | |
1395 | */ | |
1396 | static void detach_delta_base_cache_entry(struct delta_base_cache_entry *ent) | |
1397 | { | |
1398 | hashmap_remove(&delta_base_cache, ent, &ent->key); | |
1399 | list_del(&ent->lru); | |
1400 | delta_base_cached -= ent->size; | |
1401 | free(ent); | |
1402 | } | |
1403 | ||
9d98354f SB |
1404 | static void *cache_or_unpack_entry(struct repository *r, struct packed_git *p, |
1405 | off_t base_offset, unsigned long *base_size, | |
1406 | enum object_type *type) | |
f1d8130b JT |
1407 | { |
1408 | struct delta_base_cache_entry *ent; | |
1409 | ||
1410 | ent = get_delta_base_cache_entry(p, base_offset); | |
1411 | if (!ent) | |
9d98354f | 1412 | return unpack_entry(r, p, base_offset, type, base_size); |
f1d8130b JT |
1413 | |
1414 | if (type) | |
1415 | *type = ent->type; | |
1416 | if (base_size) | |
1417 | *base_size = ent->size; | |
1418 | return xmemdupz(ent->data, ent->size); | |
1419 | } | |
1420 | ||
1421 | static inline void release_delta_base_cache(struct delta_base_cache_entry *ent) | |
1422 | { | |
1423 | free(ent->data); | |
1424 | detach_delta_base_cache_entry(ent); | |
1425 | } | |
1426 | ||
1427 | void clear_delta_base_cache(void) | |
1428 | { | |
1429 | struct list_head *lru, *tmp; | |
1430 | list_for_each_safe(lru, tmp, &delta_base_cache_lru) { | |
1431 | struct delta_base_cache_entry *entry = | |
1432 | list_entry(lru, struct delta_base_cache_entry, lru); | |
1433 | release_delta_base_cache(entry); | |
1434 | } | |
1435 | } | |
1436 | ||
1437 | static void add_delta_base_cache(struct packed_git *p, off_t base_offset, | |
1438 | void *base, unsigned long base_size, enum object_type type) | |
1439 | { | |
1440 | struct delta_base_cache_entry *ent = xmalloc(sizeof(*ent)); | |
1441 | struct list_head *lru, *tmp; | |
1442 | ||
1443 | delta_base_cached += base_size; | |
1444 | ||
1445 | list_for_each_safe(lru, tmp, &delta_base_cache_lru) { | |
1446 | struct delta_base_cache_entry *f = | |
1447 | list_entry(lru, struct delta_base_cache_entry, lru); | |
1448 | if (delta_base_cached <= delta_base_cache_limit) | |
1449 | break; | |
1450 | release_delta_base_cache(f); | |
1451 | } | |
1452 | ||
1453 | ent->key.p = p; | |
1454 | ent->key.base_offset = base_offset; | |
1455 | ent->type = type; | |
1456 | ent->data = base; | |
1457 | ent->size = base_size; | |
1458 | list_add_tail(&ent->lru, &delta_base_cache_lru); | |
1459 | ||
1460 | if (!delta_base_cache.cmpfn) | |
1461 | hashmap_init(&delta_base_cache, delta_base_cache_hash_cmp, NULL, 0); | |
1462 | hashmap_entry_init(ent, pack_entry_hash(p, base_offset)); | |
1463 | hashmap_add(&delta_base_cache, ent); | |
1464 | } | |
1465 | ||
9d98354f SB |
1466 | int packed_object_info(struct repository *r, struct packed_git *p, |
1467 | off_t obj_offset, struct object_info *oi) | |
f1d8130b JT |
1468 | { |
1469 | struct pack_window *w_curs = NULL; | |
1470 | unsigned long size; | |
1471 | off_t curpos = obj_offset; | |
1472 | enum object_type type; | |
1473 | ||
1474 | /* | |
1475 | * We always get the representation type, but only convert it to | |
1476 | * a "real" type later if the caller is interested. | |
1477 | */ | |
1478 | if (oi->contentp) { | |
9d98354f | 1479 | *oi->contentp = cache_or_unpack_entry(r, p, obj_offset, oi->sizep, |
f1d8130b JT |
1480 | &type); |
1481 | if (!*oi->contentp) | |
1482 | type = OBJ_BAD; | |
1483 | } else { | |
1484 | type = unpack_object_header(p, &w_curs, &curpos, &size); | |
1485 | } | |
1486 | ||
1487 | if (!oi->contentp && oi->sizep) { | |
1488 | if (type == OBJ_OFS_DELTA || type == OBJ_REF_DELTA) { | |
1489 | off_t tmp_pos = curpos; | |
1490 | off_t base_offset = get_delta_base(p, &w_curs, &tmp_pos, | |
1491 | type, obj_offset); | |
1492 | if (!base_offset) { | |
1493 | type = OBJ_BAD; | |
1494 | goto out; | |
1495 | } | |
1496 | *oi->sizep = get_size_from_delta(p, &w_curs, tmp_pos); | |
1497 | if (*oi->sizep == 0) { | |
1498 | type = OBJ_BAD; | |
1499 | goto out; | |
1500 | } | |
1501 | } else { | |
1502 | *oi->sizep = size; | |
1503 | } | |
1504 | } | |
1505 | ||
1506 | if (oi->disk_sizep) { | |
1507 | struct revindex_entry *revidx = find_pack_revindex(p, obj_offset); | |
1508 | *oi->disk_sizep = revidx[1].offset - obj_offset; | |
1509 | } | |
1510 | ||
6ca32f47 | 1511 | if (oi->typep || oi->type_name) { |
f1d8130b | 1512 | enum object_type ptot; |
9d98354f | 1513 | ptot = packed_to_object_type(r, p, obj_offset, |
144f4948 | 1514 | type, &w_curs, curpos); |
f1d8130b JT |
1515 | if (oi->typep) |
1516 | *oi->typep = ptot; | |
6ca32f47 | 1517 | if (oi->type_name) { |
debca9d2 | 1518 | const char *tn = type_name(ptot); |
f1d8130b | 1519 | if (tn) |
6ca32f47 | 1520 | strbuf_addstr(oi->type_name, tn); |
f1d8130b JT |
1521 | } |
1522 | if (ptot < 0) { | |
1523 | type = OBJ_BAD; | |
1524 | goto out; | |
1525 | } | |
1526 | } | |
1527 | ||
1528 | if (oi->delta_base_sha1) { | |
1529 | if (type == OBJ_OFS_DELTA || type == OBJ_REF_DELTA) { | |
1530 | const unsigned char *base; | |
1531 | ||
1532 | base = get_delta_base_sha1(p, &w_curs, curpos, | |
1533 | type, obj_offset); | |
1534 | if (!base) { | |
1535 | type = OBJ_BAD; | |
1536 | goto out; | |
1537 | } | |
1538 | ||
1539 | hashcpy(oi->delta_base_sha1, base); | |
1540 | } else | |
1541 | hashclr(oi->delta_base_sha1); | |
1542 | } | |
1543 | ||
1544 | oi->whence = in_delta_base_cache(p, obj_offset) ? OI_DBCACHED : | |
1545 | OI_PACKED; | |
1546 | ||
1547 | out: | |
1548 | unuse_pack(&w_curs); | |
1549 | return type; | |
1550 | } | |
1551 | ||
1552 | static void *unpack_compressed_entry(struct packed_git *p, | |
1553 | struct pack_window **w_curs, | |
1554 | off_t curpos, | |
1555 | unsigned long size) | |
1556 | { | |
1557 | int st; | |
1558 | git_zstream stream; | |
1559 | unsigned char *buffer, *in; | |
1560 | ||
1561 | buffer = xmallocz_gently(size); | |
1562 | if (!buffer) | |
1563 | return NULL; | |
1564 | memset(&stream, 0, sizeof(stream)); | |
1565 | stream.next_out = buffer; | |
1566 | stream.avail_out = size + 1; | |
1567 | ||
1568 | git_inflate_init(&stream); | |
1569 | do { | |
1570 | in = use_pack(p, w_curs, curpos, &stream.avail_in); | |
1571 | stream.next_in = in; | |
1572 | st = git_inflate(&stream, Z_FINISH); | |
1573 | if (!stream.avail_out) | |
1574 | break; /* the payload is larger than it should be */ | |
1575 | curpos += stream.next_in - in; | |
1576 | } while (st == Z_OK || st == Z_BUF_ERROR); | |
1577 | git_inflate_end(&stream); | |
1578 | if ((st != Z_STREAM_END) || stream.total_out != size) { | |
1579 | free(buffer); | |
1580 | return NULL; | |
1581 | } | |
1582 | ||
b611396e JL |
1583 | /* versions of zlib can clobber unconsumed portion of outbuf */ |
1584 | buffer[size] = '\0'; | |
1585 | ||
f1d8130b JT |
1586 | return buffer; |
1587 | } | |
1588 | ||
1589 | static void write_pack_access_log(struct packed_git *p, off_t obj_offset) | |
1590 | { | |
1591 | static struct trace_key pack_access = TRACE_KEY_INIT(PACK_ACCESS); | |
1592 | trace_printf_key(&pack_access, "%s %"PRIuMAX"\n", | |
1593 | p->pack_name, (uintmax_t)obj_offset); | |
1594 | } | |
1595 | ||
1596 | int do_check_packed_object_crc; | |
1597 | ||
1598 | #define UNPACK_ENTRY_STACK_PREALLOC 64 | |
1599 | struct unpack_entry_stack_ent { | |
1600 | off_t obj_offset; | |
1601 | off_t curpos; | |
1602 | unsigned long size; | |
1603 | }; | |
1604 | ||
9d98354f SB |
1605 | static void *read_object(struct repository *r, |
1606 | const struct object_id *oid, | |
1607 | enum object_type *type, | |
f1d8130b JT |
1608 | unsigned long *size) |
1609 | { | |
1610 | struct object_info oi = OBJECT_INFO_INIT; | |
1611 | void *content; | |
1612 | oi.typep = type; | |
1613 | oi.sizep = size; | |
1614 | oi.contentp = &content; | |
1615 | ||
9d98354f | 1616 | if (oid_object_info_extended(r, oid, &oi, 0) < 0) |
f1d8130b JT |
1617 | return NULL; |
1618 | return content; | |
1619 | } | |
1620 | ||
9d98354f | 1621 | void *unpack_entry(struct repository *r, struct packed_git *p, off_t obj_offset, |
f1d8130b JT |
1622 | enum object_type *final_type, unsigned long *final_size) |
1623 | { | |
1624 | struct pack_window *w_curs = NULL; | |
1625 | off_t curpos = obj_offset; | |
1626 | void *data = NULL; | |
1627 | unsigned long size; | |
1628 | enum object_type type; | |
1629 | struct unpack_entry_stack_ent small_delta_stack[UNPACK_ENTRY_STACK_PREALLOC]; | |
1630 | struct unpack_entry_stack_ent *delta_stack = small_delta_stack; | |
1631 | int delta_stack_nr = 0, delta_stack_alloc = UNPACK_ENTRY_STACK_PREALLOC; | |
1632 | int base_from_cache = 0; | |
1633 | ||
1634 | write_pack_access_log(p, obj_offset); | |
1635 | ||
1636 | /* PHASE 1: drill down to the innermost base object */ | |
1637 | for (;;) { | |
1638 | off_t base_offset; | |
1639 | int i; | |
1640 | struct delta_base_cache_entry *ent; | |
1641 | ||
1642 | ent = get_delta_base_cache_entry(p, curpos); | |
1643 | if (ent) { | |
1644 | type = ent->type; | |
1645 | data = ent->data; | |
1646 | size = ent->size; | |
1647 | detach_delta_base_cache_entry(ent); | |
1648 | base_from_cache = 1; | |
1649 | break; | |
1650 | } | |
1651 | ||
1652 | if (do_check_packed_object_crc && p->index_version > 1) { | |
1653 | struct revindex_entry *revidx = find_pack_revindex(p, obj_offset); | |
1654 | off_t len = revidx[1].offset - obj_offset; | |
1655 | if (check_pack_crc(p, &w_curs, obj_offset, len, revidx->nr)) { | |
4310b0c4 | 1656 | struct object_id oid; |
1657 | nth_packed_object_oid(&oid, p, revidx->nr); | |
f1d8130b | 1658 | error("bad packed object CRC for %s", |
4310b0c4 | 1659 | oid_to_hex(&oid)); |
1660 | mark_bad_packed_object(p, oid.hash); | |
f1d8130b JT |
1661 | data = NULL; |
1662 | goto out; | |
1663 | } | |
1664 | } | |
1665 | ||
1666 | type = unpack_object_header(p, &w_curs, &curpos, &size); | |
1667 | if (type != OBJ_OFS_DELTA && type != OBJ_REF_DELTA) | |
1668 | break; | |
1669 | ||
1670 | base_offset = get_delta_base(p, &w_curs, &curpos, type, obj_offset); | |
1671 | if (!base_offset) { | |
1672 | error("failed to validate delta base reference " | |
1673 | "at offset %"PRIuMAX" from %s", | |
1674 | (uintmax_t)curpos, p->pack_name); | |
1675 | /* bail to phase 2, in hopes of recovery */ | |
1676 | data = NULL; | |
1677 | break; | |
1678 | } | |
1679 | ||
1680 | /* push object, proceed to base */ | |
1681 | if (delta_stack_nr >= delta_stack_alloc | |
1682 | && delta_stack == small_delta_stack) { | |
1683 | delta_stack_alloc = alloc_nr(delta_stack_nr); | |
1684 | ALLOC_ARRAY(delta_stack, delta_stack_alloc); | |
921d49be RS |
1685 | COPY_ARRAY(delta_stack, small_delta_stack, |
1686 | delta_stack_nr); | |
f1d8130b JT |
1687 | } else { |
1688 | ALLOC_GROW(delta_stack, delta_stack_nr+1, delta_stack_alloc); | |
1689 | } | |
1690 | i = delta_stack_nr++; | |
1691 | delta_stack[i].obj_offset = obj_offset; | |
1692 | delta_stack[i].curpos = curpos; | |
1693 | delta_stack[i].size = size; | |
1694 | ||
1695 | curpos = obj_offset = base_offset; | |
1696 | } | |
1697 | ||
1698 | /* PHASE 2: handle the base */ | |
1699 | switch (type) { | |
1700 | case OBJ_OFS_DELTA: | |
1701 | case OBJ_REF_DELTA: | |
1702 | if (data) | |
033abf97 | 1703 | BUG("unpack_entry: left loop at a valid delta"); |
f1d8130b JT |
1704 | break; |
1705 | case OBJ_COMMIT: | |
1706 | case OBJ_TREE: | |
1707 | case OBJ_BLOB: | |
1708 | case OBJ_TAG: | |
1709 | if (!base_from_cache) | |
1710 | data = unpack_compressed_entry(p, &w_curs, curpos, size); | |
1711 | break; | |
1712 | default: | |
1713 | data = NULL; | |
1714 | error("unknown object type %i at offset %"PRIuMAX" in %s", | |
1715 | type, (uintmax_t)obj_offset, p->pack_name); | |
1716 | } | |
1717 | ||
1718 | /* PHASE 3: apply deltas in order */ | |
1719 | ||
1720 | /* invariants: | |
1721 | * 'data' holds the base data, or NULL if there was corruption | |
1722 | */ | |
1723 | while (delta_stack_nr) { | |
1724 | void *delta_data; | |
1725 | void *base = data; | |
1726 | void *external_base = NULL; | |
1727 | unsigned long delta_size, base_size = size; | |
1728 | int i; | |
1729 | ||
1730 | data = NULL; | |
1731 | ||
1732 | if (base) | |
1733 | add_delta_base_cache(p, obj_offset, base, base_size, type); | |
1734 | ||
1735 | if (!base) { | |
1736 | /* | |
1737 | * We're probably in deep shit, but let's try to fetch | |
1738 | * the required base anyway from another pack or loose. | |
1739 | * This is costly but should happen only in the presence | |
1740 | * of a corrupted pack, and is better than failing outright. | |
1741 | */ | |
1742 | struct revindex_entry *revidx; | |
4310b0c4 | 1743 | struct object_id base_oid; |
f1d8130b JT |
1744 | revidx = find_pack_revindex(p, obj_offset); |
1745 | if (revidx) { | |
4310b0c4 | 1746 | nth_packed_object_oid(&base_oid, p, revidx->nr); |
f1d8130b JT |
1747 | error("failed to read delta base object %s" |
1748 | " at offset %"PRIuMAX" from %s", | |
4310b0c4 | 1749 | oid_to_hex(&base_oid), (uintmax_t)obj_offset, |
f1d8130b | 1750 | p->pack_name); |
4310b0c4 | 1751 | mark_bad_packed_object(p, base_oid.hash); |
9d98354f | 1752 | base = read_object(r, &base_oid, &type, &base_size); |
f1d8130b JT |
1753 | external_base = base; |
1754 | } | |
1755 | } | |
1756 | ||
1757 | i = --delta_stack_nr; | |
1758 | obj_offset = delta_stack[i].obj_offset; | |
1759 | curpos = delta_stack[i].curpos; | |
1760 | delta_size = delta_stack[i].size; | |
1761 | ||
1762 | if (!base) | |
1763 | continue; | |
1764 | ||
1765 | delta_data = unpack_compressed_entry(p, &w_curs, curpos, delta_size); | |
1766 | ||
1767 | if (!delta_data) { | |
1768 | error("failed to unpack compressed delta " | |
1769 | "at offset %"PRIuMAX" from %s", | |
1770 | (uintmax_t)curpos, p->pack_name); | |
1771 | data = NULL; | |
1772 | free(external_base); | |
1773 | continue; | |
1774 | } | |
1775 | ||
1776 | data = patch_delta(base, base_size, | |
1777 | delta_data, delta_size, | |
1778 | &size); | |
1779 | ||
1780 | /* | |
1781 | * We could not apply the delta; warn the user, but keep going. | |
1782 | * Our failure will be noticed either in the next iteration of | |
1783 | * the loop, or if this is the final delta, in the caller when | |
1784 | * we return NULL. Those code paths will take care of making | |
1785 | * a more explicit warning and retrying with another copy of | |
1786 | * the object. | |
1787 | */ | |
1788 | if (!data) | |
1789 | error("failed to apply delta"); | |
1790 | ||
1791 | free(delta_data); | |
1792 | free(external_base); | |
1793 | } | |
1794 | ||
1795 | if (final_type) | |
1796 | *final_type = type; | |
1797 | if (final_size) | |
1798 | *final_size = size; | |
1799 | ||
1800 | out: | |
1801 | unuse_pack(&w_curs); | |
1802 | ||
1803 | if (delta_stack != small_delta_stack) | |
1804 | free(delta_stack); | |
1805 | ||
1806 | return data; | |
1807 | } | |
d5a16761 | 1808 | |
3d475f46 DS |
1809 | int bsearch_pack(const struct object_id *oid, const struct packed_git *p, uint32_t *result) |
1810 | { | |
1811 | const unsigned char *index_fanout = p->index_data; | |
1812 | const unsigned char *index_lookup; | |
37fec86a | 1813 | const unsigned int hashsz = the_hash_algo->rawsz; |
3d475f46 DS |
1814 | int index_lookup_width; |
1815 | ||
1816 | if (!index_fanout) | |
1817 | BUG("bsearch_pack called without a valid pack-index"); | |
1818 | ||
1819 | index_lookup = index_fanout + 4 * 256; | |
1820 | if (p->index_version == 1) { | |
37fec86a | 1821 | index_lookup_width = hashsz + 4; |
3d475f46 DS |
1822 | index_lookup += 4; |
1823 | } else { | |
37fec86a | 1824 | index_lookup_width = hashsz; |
3d475f46 DS |
1825 | index_fanout += 8; |
1826 | index_lookup += 8; | |
1827 | } | |
1828 | ||
1829 | return bsearch_hash(oid->hash, (const uint32_t*)index_fanout, | |
1830 | index_lookup, index_lookup_width, result); | |
1831 | } | |
1832 | ||
d5a16761 JT |
1833 | const unsigned char *nth_packed_object_sha1(struct packed_git *p, |
1834 | uint32_t n) | |
1835 | { | |
1836 | const unsigned char *index = p->index_data; | |
37fec86a | 1837 | const unsigned int hashsz = the_hash_algo->rawsz; |
d5a16761 JT |
1838 | if (!index) { |
1839 | if (open_pack_index(p)) | |
1840 | return NULL; | |
1841 | index = p->index_data; | |
1842 | } | |
1843 | if (n >= p->num_objects) | |
1844 | return NULL; | |
1845 | index += 4 * 256; | |
1846 | if (p->index_version == 1) { | |
37fec86a | 1847 | return index + (hashsz + 4) * n + 4; |
d5a16761 JT |
1848 | } else { |
1849 | index += 8; | |
37fec86a | 1850 | return index + hashsz * n; |
d5a16761 JT |
1851 | } |
1852 | } | |
1853 | ||
1854 | const struct object_id *nth_packed_object_oid(struct object_id *oid, | |
1855 | struct packed_git *p, | |
1856 | uint32_t n) | |
1857 | { | |
1858 | const unsigned char *hash = nth_packed_object_sha1(p, n); | |
1859 | if (!hash) | |
1860 | return NULL; | |
1861 | hashcpy(oid->hash, hash); | |
1862 | return oid; | |
1863 | } | |
9e0f45f5 JT |
1864 | |
1865 | void check_pack_index_ptr(const struct packed_git *p, const void *vptr) | |
1866 | { | |
1867 | const unsigned char *ptr = vptr; | |
1868 | const unsigned char *start = p->index_data; | |
1869 | const unsigned char *end = start + p->index_size; | |
1870 | if (ptr < start) | |
1871 | die(_("offset before start of pack index for %s (corrupt index?)"), | |
1872 | p->pack_name); | |
1873 | /* No need to check for underflow; .idx files must be at least 8 bytes */ | |
1874 | if (ptr >= end - 8) | |
1875 | die(_("offset beyond end of pack index for %s (truncated index?)"), | |
1876 | p->pack_name); | |
1877 | } | |
1878 | ||
1879 | off_t nth_packed_object_offset(const struct packed_git *p, uint32_t n) | |
1880 | { | |
1881 | const unsigned char *index = p->index_data; | |
37fec86a | 1882 | const unsigned int hashsz = the_hash_algo->rawsz; |
9e0f45f5 JT |
1883 | index += 4 * 256; |
1884 | if (p->index_version == 1) { | |
37fec86a | 1885 | return ntohl(*((uint32_t *)(index + (hashsz + 4) * n))); |
9e0f45f5 JT |
1886 | } else { |
1887 | uint32_t off; | |
37fec86a | 1888 | index += 8 + p->num_objects * (hashsz + 4); |
9e0f45f5 JT |
1889 | off = ntohl(*((uint32_t *)(index + 4 * n))); |
1890 | if (!(off & 0x80000000)) | |
1891 | return off; | |
1892 | index += p->num_objects * 4 + (off & 0x7fffffff) * 8; | |
1893 | check_pack_index_ptr(p, index); | |
ad622a25 | 1894 | return get_be64(index); |
9e0f45f5 JT |
1895 | } |
1896 | } | |
a2551953 JT |
1897 | |
1898 | off_t find_pack_entry_one(const unsigned char *sha1, | |
1899 | struct packed_git *p) | |
1900 | { | |
a2551953 | 1901 | const unsigned char *index = p->index_data; |
3d475f46 | 1902 | struct object_id oid; |
b4e00f73 | 1903 | uint32_t result; |
a2551953 JT |
1904 | |
1905 | if (!index) { | |
1906 | if (open_pack_index(p)) | |
1907 | return 0; | |
a2551953 JT |
1908 | } |
1909 | ||
3d475f46 DS |
1910 | hashcpy(oid.hash, sha1); |
1911 | if (bsearch_pack(&oid, p, &result)) | |
b4e00f73 | 1912 | return nth_packed_object_offset(p, result); |
a2551953 JT |
1913 | return 0; |
1914 | } | |
1915 | ||
1916 | int is_pack_valid(struct packed_git *p) | |
1917 | { | |
1918 | /* An already open pack is known to be valid. */ | |
1919 | if (p->pack_fd != -1) | |
1920 | return 1; | |
1921 | ||
1922 | /* If the pack has one window completely covering the | |
1923 | * file size, the pack is known to be valid even if | |
1924 | * the descriptor is not currently open. | |
1925 | */ | |
1926 | if (p->windows) { | |
1927 | struct pack_window *w = p->windows; | |
1928 | ||
1929 | if (!w->offset && w->len == p->pack_size) | |
1930 | return 1; | |
1931 | } | |
1932 | ||
1933 | /* Force the pack to open to prove its valid. */ | |
1934 | return !open_packed_git(p); | |
1935 | } | |
d6fe0036 JT |
1936 | |
1937 | struct packed_git *find_sha1_pack(const unsigned char *sha1, | |
1938 | struct packed_git *packs) | |
1939 | { | |
1940 | struct packed_git *p; | |
1941 | ||
1942 | for (p = packs; p; p = p->next) { | |
1943 | if (find_pack_entry_one(sha1, p)) | |
1944 | return p; | |
1945 | } | |
1946 | return NULL; | |
1947 | ||
1948 | } | |
1a1e5d4f | 1949 | |
544443cb | 1950 | static int fill_pack_entry(const struct object_id *oid, |
1a1e5d4f JT |
1951 | struct pack_entry *e, |
1952 | struct packed_git *p) | |
1953 | { | |
1954 | off_t offset; | |
1955 | ||
1956 | if (p->num_bad_objects) { | |
1957 | unsigned i; | |
1958 | for (i = 0; i < p->num_bad_objects; i++) | |
e3ff0683 JK |
1959 | if (hasheq(oid->hash, |
1960 | p->bad_object_sha1 + the_hash_algo->rawsz * i)) | |
1a1e5d4f JT |
1961 | return 0; |
1962 | } | |
1963 | ||
544443cb | 1964 | offset = find_pack_entry_one(oid->hash, p); |
1a1e5d4f JT |
1965 | if (!offset) |
1966 | return 0; | |
1967 | ||
1968 | /* | |
1969 | * We are about to tell the caller where they can locate the | |
1970 | * requested object. We better make sure the packfile is | |
1971 | * still here and can be accessed before supplying that | |
1972 | * answer, as it may have been deleted since the index was | |
1973 | * loaded! | |
1974 | */ | |
1975 | if (!is_pack_valid(p)) | |
1976 | return 0; | |
1977 | e->offset = offset; | |
1978 | e->p = p; | |
1a1e5d4f JT |
1979 | return 1; |
1980 | } | |
1981 | ||
544443cb | 1982 | int find_pack_entry(struct repository *r, const struct object_id *oid, struct pack_entry *e) |
1a1e5d4f | 1983 | { |
8865859d | 1984 | struct list_head *pos; |
3715a633 | 1985 | struct multi_pack_index *m; |
1a1e5d4f | 1986 | |
0a0dd632 | 1987 | prepare_packed_git(r); |
3715a633 | 1988 | if (!r->objects->packed_git && !r->objects->multi_pack_index) |
1a1e5d4f JT |
1989 | return 0; |
1990 | ||
3715a633 | 1991 | for (m = r->objects->multi_pack_index; m; m = m->next) { |
64404a24 | 1992 | if (fill_midx_entry(r, oid, e, m)) |
3715a633 DS |
1993 | return 1; |
1994 | } | |
1995 | ||
0a0dd632 | 1996 | list_for_each(pos, &r->objects->packed_git_mru) { |
ec2dd32c | 1997 | struct packed_git *p = list_entry(pos, struct packed_git, mru); |
af96fe33 | 1998 | if (!p->multi_pack_index && fill_pack_entry(oid, e, p)) { |
0a0dd632 | 1999 | list_move(&p->mru, &r->objects->packed_git_mru); |
1a1e5d4f JT |
2000 | return 1; |
2001 | } | |
2002 | } | |
2003 | return 0; | |
2004 | } | |
150e3001 | 2005 | |
14c3c80c | 2006 | int has_object_pack(const struct object_id *oid) |
150e3001 JT |
2007 | { |
2008 | struct pack_entry e; | |
544443cb | 2009 | return find_pack_entry(the_repository, oid, &e); |
150e3001 | 2010 | } |
f9a8672a JT |
2011 | |
2012 | int has_pack_index(const unsigned char *sha1) | |
2013 | { | |
2014 | struct stat st; | |
2015 | if (stat(sha1_pack_index_name(sha1), &st)) | |
2016 | return 0; | |
2017 | return 1; | |
2018 | } | |
7709f468 | 2019 | |
736eb88f JK |
2020 | int for_each_object_in_pack(struct packed_git *p, |
2021 | each_packed_object_fn cb, void *data, | |
2022 | enum for_each_object_flags flags) | |
7709f468 JT |
2023 | { |
2024 | uint32_t i; | |
2025 | int r = 0; | |
2026 | ||
4828ce98 JK |
2027 | if (flags & FOR_EACH_OBJECT_PACK_ORDER) { |
2028 | if (load_pack_revindex(p)) | |
2029 | return -1; | |
2030 | } | |
736eb88f | 2031 | |
7709f468 | 2032 | for (i = 0; i < p->num_objects; i++) { |
736eb88f | 2033 | uint32_t pos; |
7709f468 JT |
2034 | struct object_id oid; |
2035 | ||
736eb88f JK |
2036 | if (flags & FOR_EACH_OBJECT_PACK_ORDER) |
2037 | pos = p->revindex[i].nr; | |
2038 | else | |
2039 | pos = i; | |
2040 | ||
2041 | if (!nth_packed_object_oid(&oid, p, pos)) | |
7709f468 | 2042 | return error("unable to get sha1 of object %u in %s", |
736eb88f | 2043 | pos, p->pack_name); |
7709f468 | 2044 | |
736eb88f | 2045 | r = cb(&oid, p, pos, data); |
7709f468 JT |
2046 | if (r) |
2047 | break; | |
2048 | } | |
2049 | return r; | |
2050 | } | |
2051 | ||
a7ff6f5a JK |
2052 | int for_each_packed_object(each_packed_object_fn cb, void *data, |
2053 | enum for_each_object_flags flags) | |
7709f468 JT |
2054 | { |
2055 | struct packed_git *p; | |
2056 | int r = 0; | |
2057 | int pack_errors = 0; | |
2058 | ||
6fdb4e9f | 2059 | prepare_packed_git(the_repository); |
454ea2e4 | 2060 | for (p = get_all_packs(the_repository); p; p = p->next) { |
7709f468 JT |
2061 | if ((flags & FOR_EACH_OBJECT_LOCAL_ONLY) && !p->pack_local) |
2062 | continue; | |
498f1f61 JT |
2063 | if ((flags & FOR_EACH_OBJECT_PROMISOR_ONLY) && |
2064 | !p->pack_promisor) | |
2065 | continue; | |
7709f468 JT |
2066 | if (open_pack_index(p)) { |
2067 | pack_errors = 1; | |
2068 | continue; | |
2069 | } | |
736eb88f | 2070 | r = for_each_object_in_pack(p, cb, data, flags); |
7709f468 JT |
2071 | if (r) |
2072 | break; | |
2073 | } | |
2074 | return r ? r : pack_errors; | |
2075 | } | |
498f1f61 JT |
2076 | |
2077 | static int add_promisor_object(const struct object_id *oid, | |
2078 | struct packed_git *pack, | |
2079 | uint32_t pos, | |
2080 | void *set_) | |
2081 | { | |
2082 | struct oidset *set = set_; | |
109cd76d | 2083 | struct object *obj = parse_object(the_repository, oid); |
498f1f61 JT |
2084 | if (!obj) |
2085 | return 1; | |
2086 | ||
2087 | oidset_insert(set, oid); | |
2088 | ||
2089 | /* | |
2090 | * If this is a tree, commit, or tag, the objects it refers | |
a80d72db | 2091 | * to are also promisor objects. (Blobs refer to no objects->) |
498f1f61 JT |
2092 | */ |
2093 | if (obj->type == OBJ_TREE) { | |
2094 | struct tree *tree = (struct tree *)obj; | |
2095 | struct tree_desc desc; | |
2096 | struct name_entry entry; | |
2097 | if (init_tree_desc_gently(&desc, tree->buffer, tree->size)) | |
2098 | /* | |
2099 | * Error messages are given when packs are | |
2100 | * verified, so do not print any here. | |
2101 | */ | |
2102 | return 0; | |
2103 | while (tree_entry_gently(&desc, &entry)) | |
ea82b2a0 | 2104 | oidset_insert(set, &entry.oid); |
498f1f61 JT |
2105 | } else if (obj->type == OBJ_COMMIT) { |
2106 | struct commit *commit = (struct commit *) obj; | |
2107 | struct commit_list *parents = commit->parents; | |
2108 | ||
2e27bd77 | 2109 | oidset_insert(set, get_commit_tree_oid(commit)); |
498f1f61 JT |
2110 | for (; parents; parents = parents->next) |
2111 | oidset_insert(set, &parents->item->object.oid); | |
2112 | } else if (obj->type == OBJ_TAG) { | |
2113 | struct tag *tag = (struct tag *) obj; | |
2114 | oidset_insert(set, &tag->tagged->oid); | |
2115 | } | |
2116 | return 0; | |
2117 | } | |
2118 | ||
2119 | int is_promisor_object(const struct object_id *oid) | |
2120 | { | |
2121 | static struct oidset promisor_objects; | |
2122 | static int promisor_objects_prepared; | |
2123 | ||
2124 | if (!promisor_objects_prepared) { | |
2125 | if (repository_format_partial_clone) { | |
2126 | for_each_packed_object(add_promisor_object, | |
2127 | &promisor_objects, | |
2128 | FOR_EACH_OBJECT_PROMISOR_ONLY); | |
2129 | } | |
2130 | promisor_objects_prepared = 1; | |
2131 | } | |
2132 | return oidset_contains(&promisor_objects, oid); | |
2133 | } |