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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 | 9 | #include "streaming.h" |
bc626927 | 10 | #include "hash-lookup.h" |
498f1f61 JT |
11 | #include "commit.h" |
12 | #include "object.h" | |
13 | #include "tag.h" | |
14 | #include "tree-walk.h" | |
15 | #include "tree.h" | |
0d4a1321 | 16 | #include "object-store.h" |
c4d25228 | 17 | #include "midx.h" |
5472c32c | 18 | #include "commit-graph.h" |
b14ed5ad | 19 | #include "promisor-remote.h" |
4f39cd82 JT |
20 | |
21 | char *odb_pack_name(struct strbuf *buf, | |
3a4d7aa5 | 22 | const unsigned char *hash, |
4f39cd82 JT |
23 | const char *ext) |
24 | { | |
25 | strbuf_reset(buf); | |
26 | strbuf_addf(buf, "%s/pack/pack-%s.%s", get_object_directory(), | |
3a4d7aa5 | 27 | hash_to_hex(hash), ext); |
4f39cd82 JT |
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 | */ |
81c4c5cf | 151 | if (idx_size != st_add(4 * 256 + hashsz + hashsz, st_mult(nr, hashsz + 4))) |
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 | */ | |
81c4c5cf | 167 | size_t min_size = st_add(8 + 4*256 + hashsz + hashsz, st_mult(nr, hashsz + 4 + 4)); |
a9bc372e | 168 | size_t max_size = min_size; |
0317f455 | 169 | if (nr) |
81c4c5cf | 170 | max_size = st_add(max_size, st_mult(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); |
629dffc4 | 181 | p->crc_offset = 8 + 4 * 256 + nr * hashsz; |
0317f455 JT |
182 | } |
183 | ||
184 | p->index_version = version; | |
185 | p->index_data = idx_map; | |
186 | p->index_size = idx_size; | |
187 | p->num_objects = nr; | |
188 | return 0; | |
189 | } | |
190 | ||
191 | int open_pack_index(struct packed_git *p) | |
192 | { | |
193 | char *idx_name; | |
194 | size_t len; | |
195 | int ret; | |
196 | ||
197 | if (p->index_data) | |
198 | return 0; | |
199 | ||
200 | if (!strip_suffix(p->pack_name, ".pack", &len)) | |
033abf97 | 201 | BUG("pack_name does not end in .pack"); |
0317f455 JT |
202 | idx_name = xstrfmt("%.*s.idx", (int)len, p->pack_name); |
203 | ret = check_packed_git_idx(idx_name, p); | |
204 | free(idx_name); | |
205 | return ret; | |
206 | } | |
207 | ||
fe1ed56f DS |
208 | uint32_t get_pack_fanout(struct packed_git *p, uint32_t value) |
209 | { | |
210 | const uint32_t *level1_ofs = p->index_data; | |
211 | ||
212 | if (!level1_ofs) { | |
213 | if (open_pack_index(p)) | |
214 | return 0; | |
215 | level1_ofs = p->index_data; | |
216 | } | |
217 | ||
218 | if (p->index_version > 1) { | |
219 | level1_ofs += 2; | |
220 | } | |
221 | ||
222 | return ntohl(level1_ofs[value]); | |
223 | } | |
224 | ||
0317f455 JT |
225 | static struct packed_git *alloc_packed_git(int extra) |
226 | { | |
227 | struct packed_git *p = xmalloc(st_add(sizeof(*p), extra)); | |
228 | memset(p, 0, sizeof(*p)); | |
229 | p->pack_fd = -1; | |
230 | return p; | |
231 | } | |
232 | ||
233 | struct packed_git *parse_pack_index(unsigned char *sha1, const char *idx_path) | |
234 | { | |
235 | const char *path = sha1_pack_name(sha1); | |
236 | size_t alloc = st_add(strlen(path), 1); | |
237 | struct packed_git *p = alloc_packed_git(alloc); | |
238 | ||
239 | memcpy(p->pack_name, path, alloc); /* includes NUL */ | |
538b1523 | 240 | hashcpy(p->hash, sha1); |
0317f455 JT |
241 | if (check_packed_git_idx(idx_path, p)) { |
242 | free(p); | |
243 | return NULL; | |
244 | } | |
245 | ||
246 | return p; | |
247 | } | |
f0e17e86 JT |
248 | |
249 | static void scan_windows(struct packed_git *p, | |
250 | struct packed_git **lru_p, | |
251 | struct pack_window **lru_w, | |
252 | struct pack_window **lru_l) | |
253 | { | |
254 | struct pack_window *w, *w_l; | |
255 | ||
256 | for (w_l = NULL, w = p->windows; w; w = w->next) { | |
257 | if (!w->inuse_cnt) { | |
258 | if (!*lru_w || w->last_used < (*lru_w)->last_used) { | |
259 | *lru_p = p; | |
260 | *lru_w = w; | |
261 | *lru_l = w_l; | |
262 | } | |
263 | } | |
264 | w_l = w; | |
265 | } | |
266 | } | |
267 | ||
84f80ad5 | 268 | static int unuse_one_window(struct packed_git *current) |
f0e17e86 JT |
269 | { |
270 | struct packed_git *p, *lru_p = NULL; | |
271 | struct pack_window *lru_w = NULL, *lru_l = NULL; | |
272 | ||
273 | if (current) | |
274 | scan_windows(current, &lru_p, &lru_w, &lru_l); | |
a80d72db | 275 | for (p = the_repository->objects->packed_git; p; p = p->next) |
f0e17e86 JT |
276 | scan_windows(p, &lru_p, &lru_w, &lru_l); |
277 | if (lru_p) { | |
278 | munmap(lru_w->base, lru_w->len); | |
279 | pack_mapped -= lru_w->len; | |
280 | if (lru_l) | |
281 | lru_l->next = lru_w->next; | |
282 | else | |
283 | lru_p->windows = lru_w->next; | |
284 | free(lru_w); | |
285 | pack_open_windows--; | |
286 | return 1; | |
287 | } | |
288 | return 0; | |
289 | } | |
290 | ||
3836d88a JT |
291 | void close_pack_windows(struct packed_git *p) |
292 | { | |
293 | while (p->windows) { | |
294 | struct pack_window *w = p->windows; | |
295 | ||
296 | if (w->inuse_cnt) | |
297 | die("pack '%s' still has open windows to it", | |
298 | p->pack_name); | |
299 | munmap(w->base, w->len); | |
300 | pack_mapped -= w->len; | |
301 | pack_open_windows--; | |
302 | p->windows = w->next; | |
303 | free(w); | |
304 | } | |
305 | } | |
306 | ||
5ae18df9 | 307 | int close_pack_fd(struct packed_git *p) |
3836d88a JT |
308 | { |
309 | if (p->pack_fd < 0) | |
310 | return 0; | |
311 | ||
312 | close(p->pack_fd); | |
313 | pack_open_fds--; | |
314 | p->pack_fd = -1; | |
315 | ||
316 | return 1; | |
317 | } | |
318 | ||
319 | void close_pack_index(struct packed_git *p) | |
320 | { | |
321 | if (p->index_data) { | |
322 | munmap((void *)p->index_data, p->index_size); | |
323 | p->index_data = NULL; | |
324 | } | |
325 | } | |
326 | ||
0bf0de6c TB |
327 | static void close_pack_revindex(struct packed_git *p) |
328 | { | |
2f4ba2a8 TB |
329 | if (!p->revindex_map) |
330 | return; | |
331 | ||
332 | munmap((void *)p->revindex_map, p->revindex_size); | |
333 | p->revindex_map = NULL; | |
334 | p->revindex_data = NULL; | |
335 | } | |
336 | ||
049d51a2 | 337 | void close_pack(struct packed_git *p) |
3836d88a JT |
338 | { |
339 | close_pack_windows(p); | |
340 | close_pack_fd(p); | |
341 | close_pack_index(p); | |
2f4ba2a8 | 342 | close_pack_revindex(p); |
8c6b4332 | 343 | oidset_clear(&p->bad_objects); |
3836d88a JT |
344 | } |
345 | ||
2d511cfc | 346 | void close_object_store(struct raw_object_store *o) |
3836d88a JT |
347 | { |
348 | struct packed_git *p; | |
349 | ||
d0b59866 | 350 | for (p = o->packed_git; p; p = p->next) |
3836d88a | 351 | if (p->do_not_close) |
033abf97 | 352 | BUG("want to close pack marked 'do-not-close'"); |
3836d88a JT |
353 | else |
354 | close_pack(p); | |
dc7d6643 DS |
355 | |
356 | if (o->multi_pack_index) { | |
357 | close_midx(o->multi_pack_index); | |
358 | o->multi_pack_index = NULL; | |
359 | } | |
5472c32c DS |
360 | |
361 | close_commit_graph(o); | |
3836d88a | 362 | } |
84f80ad5 | 363 | |
8434e85d DS |
364 | void unlink_pack_path(const char *pack_name, int force_delete) |
365 | { | |
2f4ba2a8 | 366 | static const char *exts[] = {".pack", ".idx", ".rev", ".keep", ".bitmap", ".promisor"}; |
8434e85d DS |
367 | int i; |
368 | struct strbuf buf = STRBUF_INIT; | |
369 | size_t plen; | |
370 | ||
371 | strbuf_addstr(&buf, pack_name); | |
372 | strip_suffix_mem(buf.buf, &buf.len, ".pack"); | |
373 | plen = buf.len; | |
374 | ||
375 | if (!force_delete) { | |
376 | strbuf_addstr(&buf, ".keep"); | |
377 | if (!access(buf.buf, F_OK)) { | |
378 | strbuf_release(&buf); | |
379 | return; | |
380 | } | |
381 | } | |
382 | ||
383 | for (i = 0; i < ARRAY_SIZE(exts); i++) { | |
384 | strbuf_setlen(&buf, plen); | |
385 | strbuf_addstr(&buf, exts[i]); | |
386 | unlink(buf.buf); | |
387 | } | |
388 | ||
389 | strbuf_release(&buf); | |
390 | } | |
391 | ||
84f80ad5 JT |
392 | /* |
393 | * The LRU pack is the one with the oldest MRU window, preferring packs | |
394 | * with no used windows, or the oldest mtime if it has no windows allocated. | |
395 | */ | |
396 | static void find_lru_pack(struct packed_git *p, struct packed_git **lru_p, struct pack_window **mru_w, int *accept_windows_inuse) | |
397 | { | |
398 | struct pack_window *w, *this_mru_w; | |
399 | int has_windows_inuse = 0; | |
400 | ||
401 | /* | |
402 | * Reject this pack if it has windows and the previously selected | |
403 | * one does not. If this pack does not have windows, reject | |
404 | * it if the pack file is newer than the previously selected one. | |
405 | */ | |
406 | if (*lru_p && !*mru_w && (p->windows || p->mtime > (*lru_p)->mtime)) | |
407 | return; | |
408 | ||
409 | for (w = this_mru_w = p->windows; w; w = w->next) { | |
410 | /* | |
411 | * Reject this pack if any of its windows are in use, | |
412 | * but the previously selected pack did not have any | |
413 | * inuse windows. Otherwise, record that this pack | |
414 | * has windows in use. | |
415 | */ | |
416 | if (w->inuse_cnt) { | |
417 | if (*accept_windows_inuse) | |
418 | has_windows_inuse = 1; | |
419 | else | |
420 | return; | |
421 | } | |
422 | ||
423 | if (w->last_used > this_mru_w->last_used) | |
424 | this_mru_w = w; | |
425 | ||
426 | /* | |
427 | * Reject this pack if it has windows that have been | |
428 | * used more recently than the previously selected pack. | |
429 | * If the previously selected pack had windows inuse and | |
430 | * we have not encountered a window in this pack that is | |
431 | * inuse, skip this check since we prefer a pack with no | |
432 | * inuse windows to one that has inuse windows. | |
433 | */ | |
434 | if (*mru_w && *accept_windows_inuse == has_windows_inuse && | |
435 | this_mru_w->last_used > (*mru_w)->last_used) | |
436 | return; | |
437 | } | |
438 | ||
439 | /* | |
440 | * Select this pack. | |
441 | */ | |
442 | *mru_w = this_mru_w; | |
443 | *lru_p = p; | |
444 | *accept_windows_inuse = has_windows_inuse; | |
445 | } | |
446 | ||
447 | static int close_one_pack(void) | |
448 | { | |
449 | struct packed_git *p, *lru_p = NULL; | |
450 | struct pack_window *mru_w = NULL; | |
451 | int accept_windows_inuse = 1; | |
452 | ||
a80d72db | 453 | for (p = the_repository->objects->packed_git; p; p = p->next) { |
84f80ad5 JT |
454 | if (p->pack_fd == -1) |
455 | continue; | |
456 | find_lru_pack(p, &lru_p, &mru_w, &accept_windows_inuse); | |
457 | } | |
458 | ||
459 | if (lru_p) | |
460 | return close_pack_fd(lru_p); | |
461 | ||
462 | return 0; | |
463 | } | |
464 | ||
465 | static unsigned int get_max_fd_limit(void) | |
466 | { | |
467 | #ifdef RLIMIT_NOFILE | |
468 | { | |
469 | struct rlimit lim; | |
470 | ||
471 | if (!getrlimit(RLIMIT_NOFILE, &lim)) | |
472 | return lim.rlim_cur; | |
473 | } | |
474 | #endif | |
475 | ||
476 | #ifdef _SC_OPEN_MAX | |
477 | { | |
478 | long open_max = sysconf(_SC_OPEN_MAX); | |
479 | if (0 < open_max) | |
480 | return open_max; | |
481 | /* | |
482 | * Otherwise, we got -1 for one of the two | |
483 | * reasons: | |
484 | * | |
485 | * (1) sysconf() did not understand _SC_OPEN_MAX | |
486 | * and signaled an error with -1; or | |
487 | * (2) sysconf() said there is no limit. | |
488 | * | |
489 | * We _could_ clear errno before calling sysconf() to | |
490 | * tell these two cases apart and return a huge number | |
491 | * in the latter case to let the caller cap it to a | |
492 | * value that is not so selfish, but letting the | |
493 | * fallback OPEN_MAX codepath take care of these cases | |
494 | * is a lot simpler. | |
495 | */ | |
496 | } | |
497 | #endif | |
498 | ||
499 | #ifdef OPEN_MAX | |
500 | return OPEN_MAX; | |
501 | #else | |
502 | return 1; /* see the caller ;-) */ | |
503 | #endif | |
504 | } | |
505 | ||
fc789156 JK |
506 | const char *pack_basename(struct packed_git *p) |
507 | { | |
508 | const char *ret = strrchr(p->pack_name, '/'); | |
509 | if (ret) | |
510 | ret = ret + 1; /* skip past slash */ | |
511 | else | |
512 | ret = p->pack_name; /* we only have a base */ | |
513 | return ret; | |
514 | } | |
515 | ||
84f80ad5 JT |
516 | /* |
517 | * Do not call this directly as this leaks p->pack_fd on error return; | |
518 | * call open_packed_git() instead. | |
519 | */ | |
520 | static int open_packed_git_1(struct packed_git *p) | |
521 | { | |
522 | struct stat st; | |
523 | struct pack_header hdr; | |
37fec86a | 524 | unsigned char hash[GIT_MAX_RAWSZ]; |
525 | unsigned char *idx_hash; | |
41dcc4dc | 526 | ssize_t read_result; |
37fec86a | 527 | const unsigned hashsz = the_hash_algo->rawsz; |
84f80ad5 | 528 | |
c8a45eb6 TB |
529 | if (open_pack_index(p)) |
530 | return error("packfile %s index unavailable", p->pack_name); | |
84f80ad5 JT |
531 | |
532 | if (!pack_max_fds) { | |
533 | unsigned int max_fds = get_max_fd_limit(); | |
534 | ||
535 | /* Save 3 for stdin/stdout/stderr, 22 for work */ | |
536 | if (25 < max_fds) | |
537 | pack_max_fds = max_fds - 25; | |
538 | else | |
539 | pack_max_fds = 1; | |
540 | } | |
541 | ||
542 | while (pack_max_fds <= pack_open_fds && close_one_pack()) | |
543 | ; /* nothing */ | |
544 | ||
545 | p->pack_fd = git_open(p->pack_name); | |
546 | if (p->pack_fd < 0 || fstat(p->pack_fd, &st)) | |
547 | return -1; | |
548 | pack_open_fds++; | |
549 | ||
550 | /* If we created the struct before we had the pack we lack size. */ | |
551 | if (!p->pack_size) { | |
552 | if (!S_ISREG(st.st_mode)) | |
553 | return error("packfile %s not a regular file", p->pack_name); | |
554 | p->pack_size = st.st_size; | |
555 | } else if (p->pack_size != st.st_size) | |
556 | return error("packfile %s size changed", p->pack_name); | |
557 | ||
84f80ad5 | 558 | /* Verify we recognize this pack file format. */ |
41dcc4dc JK |
559 | read_result = read_in_full(p->pack_fd, &hdr, sizeof(hdr)); |
560 | if (read_result < 0) | |
561 | return error_errno("error reading from %s", p->pack_name); | |
562 | if (read_result != sizeof(hdr)) | |
84f80ad5 JT |
563 | return error("file %s is far too short to be a packfile", p->pack_name); |
564 | if (hdr.hdr_signature != htonl(PACK_SIGNATURE)) | |
565 | return error("file %s is not a GIT packfile", p->pack_name); | |
566 | if (!pack_version_ok(hdr.hdr_version)) | |
567 | return error("packfile %s is version %"PRIu32" and not" | |
568 | " supported (try upgrading GIT to a newer version)", | |
569 | p->pack_name, ntohl(hdr.hdr_version)); | |
570 | ||
571 | /* Verify the pack matches its index. */ | |
572 | if (p->num_objects != ntohl(hdr.hdr_entries)) | |
573 | return error("packfile %s claims to have %"PRIu32" objects" | |
574 | " while index indicates %"PRIu32" objects", | |
575 | p->pack_name, ntohl(hdr.hdr_entries), | |
576 | p->num_objects); | |
4e61b221 EW |
577 | read_result = pread_in_full(p->pack_fd, hash, hashsz, |
578 | p->pack_size - hashsz); | |
41dcc4dc JK |
579 | if (read_result < 0) |
580 | return error_errno("error reading from %s", p->pack_name); | |
37fec86a | 581 | if (read_result != hashsz) |
84f80ad5 | 582 | return error("packfile %s signature is unavailable", p->pack_name); |
37fec86a | 583 | idx_hash = ((unsigned char *)p->index_data) + p->index_size - hashsz * 2; |
67947c34 | 584 | if (!hasheq(hash, idx_hash)) |
84f80ad5 JT |
585 | return error("packfile %s does not match index", p->pack_name); |
586 | return 0; | |
587 | } | |
588 | ||
a2551953 | 589 | static int open_packed_git(struct packed_git *p) |
84f80ad5 JT |
590 | { |
591 | if (!open_packed_git_1(p)) | |
592 | return 0; | |
593 | close_pack_fd(p); | |
594 | return -1; | |
595 | } | |
596 | ||
597 | static int in_window(struct pack_window *win, off_t offset) | |
598 | { | |
37fec86a | 599 | /* We must promise at least one full hash after the |
84f80ad5 JT |
600 | * offset is available from this window, otherwise the offset |
601 | * is not actually in this window and a different window (which | |
602 | * has that one hash excess) must be used. This is to support | |
603 | * the object header and delta base parsing routines below. | |
604 | */ | |
605 | off_t win_off = win->offset; | |
606 | return win_off <= offset | |
37fec86a | 607 | && (offset + the_hash_algo->rawsz) <= (win_off + win->len); |
84f80ad5 JT |
608 | } |
609 | ||
610 | unsigned char *use_pack(struct packed_git *p, | |
611 | struct pack_window **w_cursor, | |
612 | off_t offset, | |
613 | unsigned long *left) | |
614 | { | |
615 | struct pack_window *win = *w_cursor; | |
616 | ||
617 | /* Since packfiles end in a hash of their content and it's | |
618 | * pointless to ask for an offset into the middle of that | |
619 | * hash, and the in_window function above wouldn't match | |
620 | * don't allow an offset too close to the end of the file. | |
621 | */ | |
622 | if (!p->pack_size && p->pack_fd == -1 && open_packed_git(p)) | |
623 | die("packfile %s cannot be accessed", p->pack_name); | |
37fec86a | 624 | if (offset > (p->pack_size - the_hash_algo->rawsz)) |
84f80ad5 JT |
625 | die("offset beyond end of packfile (truncated pack?)"); |
626 | if (offset < 0) | |
627 | die(_("offset before end of packfile (broken .idx?)")); | |
628 | ||
629 | if (!win || !in_window(win, offset)) { | |
630 | if (win) | |
631 | win->inuse_cnt--; | |
632 | for (win = p->windows; win; win = win->next) { | |
633 | if (in_window(win, offset)) | |
634 | break; | |
635 | } | |
636 | if (!win) { | |
637 | size_t window_align = packed_git_window_size / 2; | |
638 | off_t len; | |
639 | ||
640 | if (p->pack_fd == -1 && open_packed_git(p)) | |
641 | die("packfile %s cannot be accessed", p->pack_name); | |
642 | ||
ca56dadb | 643 | CALLOC_ARRAY(win, 1); |
84f80ad5 JT |
644 | win->offset = (offset / window_align) * window_align; |
645 | len = p->pack_size - win->offset; | |
646 | if (len > packed_git_window_size) | |
647 | len = packed_git_window_size; | |
648 | win->len = (size_t)len; | |
649 | pack_mapped += win->len; | |
650 | while (packed_git_limit < pack_mapped | |
651 | && unuse_one_window(p)) | |
652 | ; /* nothing */ | |
3203566a | 653 | win->base = xmmap_gently(NULL, win->len, |
84f80ad5 JT |
654 | PROT_READ, MAP_PRIVATE, |
655 | p->pack_fd, win->offset); | |
656 | if (win->base == MAP_FAILED) | |
dc059294 EW |
657 | die_errno(_("packfile %s cannot be mapped%s"), |
658 | p->pack_name, mmap_os_err()); | |
84f80ad5 JT |
659 | if (!win->offset && win->len == p->pack_size |
660 | && !p->do_not_close) | |
661 | close_pack_fd(p); | |
662 | pack_mmap_calls++; | |
663 | pack_open_windows++; | |
664 | if (pack_mapped > peak_pack_mapped) | |
665 | peak_pack_mapped = pack_mapped; | |
666 | if (pack_open_windows > peak_pack_open_windows) | |
667 | peak_pack_open_windows = pack_open_windows; | |
668 | win->next = p->windows; | |
669 | p->windows = win; | |
670 | } | |
671 | } | |
672 | if (win != *w_cursor) { | |
673 | win->last_used = pack_used_ctr++; | |
674 | win->inuse_cnt++; | |
675 | *w_cursor = win; | |
676 | } | |
677 | offset -= win->offset; | |
678 | if (left) | |
679 | *left = win->len - xsize_t(offset); | |
680 | return win->base + offset; | |
681 | } | |
97de1803 JT |
682 | |
683 | void unuse_pack(struct pack_window **w_cursor) | |
684 | { | |
685 | struct pack_window *w = *w_cursor; | |
686 | if (w) { | |
687 | w->inuse_cnt--; | |
688 | *w_cursor = NULL; | |
689 | } | |
690 | } | |
9a428653 | 691 | |
9a428653 JT |
692 | struct packed_git *add_packed_git(const char *path, size_t path_len, int local) |
693 | { | |
9a428653 JT |
694 | struct stat st; |
695 | size_t alloc; | |
696 | struct packed_git *p; | |
697 | ||
9a428653 JT |
698 | /* |
699 | * Make sure a corresponding .pack file exists and that | |
700 | * the index looks sane. | |
701 | */ | |
702 | if (!strip_suffix_mem(path, &path_len, ".idx")) | |
703 | return NULL; | |
704 | ||
705 | /* | |
498f1f61 | 706 | * ".promisor" is long enough to hold any suffix we're adding (and |
9a428653 JT |
707 | * the use xsnprintf double-checks that) |
708 | */ | |
498f1f61 | 709 | alloc = st_add3(path_len, strlen(".promisor"), 1); |
9a428653 JT |
710 | p = alloc_packed_git(alloc); |
711 | memcpy(p->pack_name, path, path_len); | |
712 | ||
713 | xsnprintf(p->pack_name + path_len, alloc - path_len, ".keep"); | |
714 | if (!access(p->pack_name, F_OK)) | |
715 | p->pack_keep = 1; | |
716 | ||
498f1f61 JT |
717 | xsnprintf(p->pack_name + path_len, alloc - path_len, ".promisor"); |
718 | if (!access(p->pack_name, F_OK)) | |
719 | p->pack_promisor = 1; | |
720 | ||
9a428653 JT |
721 | xsnprintf(p->pack_name + path_len, alloc - path_len, ".pack"); |
722 | if (stat(p->pack_name, &st) || !S_ISREG(st.st_mode)) { | |
723 | free(p); | |
724 | return NULL; | |
725 | } | |
726 | ||
727 | /* ok, it looks sane as far as we can check without | |
728 | * actually mapping the pack file. | |
729 | */ | |
730 | p->pack_size = st.st_size; | |
731 | p->pack_local = local; | |
732 | p->mtime = st.st_mtime; | |
37fec86a | 733 | if (path_len < the_hash_algo->hexsz || |
538b1523 | 734 | get_sha1_hex(path + path_len - the_hash_algo->hexsz, p->hash)) |
735 | hashclr(p->hash); | |
9a428653 JT |
736 | return p; |
737 | } | |
e65f1862 | 738 | |
5babff16 | 739 | void install_packed_git(struct repository *r, struct packed_git *pack) |
e65f1862 JT |
740 | { |
741 | if (pack->pack_fd != -1) | |
742 | pack_open_fds++; | |
743 | ||
5babff16 SB |
744 | pack->next = r->objects->packed_git; |
745 | r->objects->packed_git = pack; | |
ec48540f CS |
746 | |
747 | hashmap_entry_init(&pack->packmap_ent, strhash(pack->pack_name)); | |
748 | hashmap_add(&r->objects->pack_map, &pack->packmap_ent); | |
e65f1862 | 749 | } |
0abe14f6 JT |
750 | |
751 | void (*report_garbage)(unsigned seen_bits, const char *path); | |
752 | ||
753 | static void report_helper(const struct string_list *list, | |
754 | int seen_bits, int first, int last) | |
755 | { | |
756 | if (seen_bits == (PACKDIR_FILE_PACK|PACKDIR_FILE_IDX)) | |
757 | return; | |
758 | ||
759 | for (; first < last; first++) | |
760 | report_garbage(seen_bits, list->items[first].string); | |
761 | } | |
762 | ||
763 | static void report_pack_garbage(struct string_list *list) | |
764 | { | |
765 | int i, baselen = -1, first = 0, seen_bits = 0; | |
766 | ||
767 | if (!report_garbage) | |
768 | return; | |
769 | ||
770 | string_list_sort(list); | |
771 | ||
772 | for (i = 0; i < list->nr; i++) { | |
773 | const char *path = list->items[i].string; | |
774 | if (baselen != -1 && | |
775 | strncmp(path, list->items[first].string, baselen)) { | |
776 | report_helper(list, seen_bits, first, i); | |
777 | baselen = -1; | |
778 | seen_bits = 0; | |
779 | } | |
780 | if (baselen == -1) { | |
781 | const char *dot = strrchr(path, '.'); | |
782 | if (!dot) { | |
783 | report_garbage(PACKDIR_FILE_GARBAGE, path); | |
784 | continue; | |
785 | } | |
786 | baselen = dot - path + 1; | |
787 | first = i; | |
788 | } | |
789 | if (!strcmp(path + baselen, "pack")) | |
790 | seen_bits |= 1; | |
791 | else if (!strcmp(path + baselen, "idx")) | |
792 | seen_bits |= 2; | |
793 | } | |
794 | report_helper(list, seen_bits, first, list->nr); | |
795 | } | |
796 | ||
9208e318 DS |
797 | void for_each_file_in_pack_dir(const char *objdir, |
798 | each_file_in_pack_dir_fn fn, | |
799 | void *data) | |
0abe14f6 JT |
800 | { |
801 | struct strbuf path = STRBUF_INIT; | |
802 | size_t dirnamelen; | |
803 | DIR *dir; | |
804 | struct dirent *de; | |
0abe14f6 JT |
805 | |
806 | strbuf_addstr(&path, objdir); | |
807 | strbuf_addstr(&path, "/pack"); | |
808 | dir = opendir(path.buf); | |
809 | if (!dir) { | |
810 | if (errno != ENOENT) | |
811 | error_errno("unable to open object pack directory: %s", | |
812 | path.buf); | |
813 | strbuf_release(&path); | |
814 | return; | |
815 | } | |
816 | strbuf_addch(&path, '/'); | |
817 | dirnamelen = path.len; | |
b548f0f1 | 818 | while ((de = readdir_skip_dot_and_dotdot(dir)) != NULL) { |
0abe14f6 JT |
819 | strbuf_setlen(&path, dirnamelen); |
820 | strbuf_addstr(&path, de->d_name); | |
821 | ||
9208e318 | 822 | fn(path.buf, path.len, de->d_name, data); |
0abe14f6 | 823 | } |
9208e318 | 824 | |
0abe14f6 | 825 | closedir(dir); |
0abe14f6 JT |
826 | strbuf_release(&path); |
827 | } | |
828 | ||
9208e318 DS |
829 | struct prepare_pack_data { |
830 | struct repository *r; | |
831 | struct string_list *garbage; | |
832 | int local; | |
f3a002bd | 833 | struct multi_pack_index *m; |
9208e318 DS |
834 | }; |
835 | ||
836 | static void prepare_pack(const char *full_name, size_t full_name_len, | |
837 | const char *file_name, void *_data) | |
838 | { | |
839 | struct prepare_pack_data *data = (struct prepare_pack_data *)_data; | |
840 | struct packed_git *p; | |
841 | size_t base_len = full_name_len; | |
842 | ||
fe86c3be DS |
843 | if (strip_suffix_mem(full_name, &base_len, ".idx") && |
844 | !(data->m && midx_contains_pack(data->m, file_name))) { | |
ec48540f CS |
845 | struct hashmap_entry hent; |
846 | char *pack_name = xstrfmt("%.*s.pack", (int)base_len, full_name); | |
847 | unsigned int hash = strhash(pack_name); | |
848 | hashmap_entry_init(&hent, hash); | |
9208e318 | 849 | |
ec48540f CS |
850 | /* Don't reopen a pack we already have. */ |
851 | if (!hashmap_get(&data->r->objects->pack_map, &hent, pack_name)) { | |
9208e318 DS |
852 | p = add_packed_git(full_name, full_name_len, data->local); |
853 | if (p) | |
854 | install_packed_git(data->r, p); | |
855 | } | |
ec48540f | 856 | free(pack_name); |
9208e318 DS |
857 | } |
858 | ||
859 | if (!report_garbage) | |
860 | return; | |
861 | ||
fe86c3be DS |
862 | if (!strcmp(file_name, "multi-pack-index")) |
863 | return; | |
f894081d | 864 | if (starts_with(file_name, "multi-pack-index") && |
0f533c72 | 865 | (ends_with(file_name, ".bitmap") || ends_with(file_name, ".rev"))) |
f894081d | 866 | return; |
9208e318 | 867 | if (ends_with(file_name, ".idx") || |
2f4ba2a8 | 868 | ends_with(file_name, ".rev") || |
9208e318 DS |
869 | ends_with(file_name, ".pack") || |
870 | ends_with(file_name, ".bitmap") || | |
871 | ends_with(file_name, ".keep") || | |
872 | ends_with(file_name, ".promisor")) | |
873 | string_list_append(data->garbage, full_name); | |
874 | else | |
875 | report_garbage(PACKDIR_FILE_GARBAGE, full_name); | |
876 | } | |
877 | ||
878 | static void prepare_packed_git_one(struct repository *r, char *objdir, int local) | |
879 | { | |
880 | struct prepare_pack_data data; | |
881 | struct string_list garbage = STRING_LIST_INIT_DUP; | |
882 | ||
f3a002bd DS |
883 | data.m = r->objects->multi_pack_index; |
884 | ||
885 | /* look for the multi-pack-index for this object directory */ | |
886 | while (data.m && strcmp(data.m->object_dir, objdir)) | |
887 | data.m = data.m->next; | |
888 | ||
9208e318 DS |
889 | data.r = r; |
890 | data.garbage = &garbage; | |
891 | data.local = local; | |
892 | ||
893 | for_each_file_in_pack_dir(objdir, prepare_pack, &data); | |
894 | ||
895 | report_pack_garbage(data.garbage); | |
896 | string_list_clear(data.garbage, 0); | |
897 | } | |
898 | ||
464416a2 | 899 | static void prepare_packed_git(struct repository *r); |
0abe14f6 JT |
900 | /* |
901 | * Give a fast, rough count of the number of objects in the repository. This | |
902 | * ignores loose objects completely. If you have a lot of them, then either | |
903 | * you should repack because your performance will be awful, or they are | |
904 | * all unreachable objects about to be pruned, in which case they're not really | |
905 | * interesting as a measure of repo size in the first place. | |
906 | */ | |
5038de19 | 907 | unsigned long repo_approximate_object_count(struct repository *r) |
0abe14f6 | 908 | { |
5038de19 | 909 | if (!r->objects->approximate_object_count_valid) { |
9a00580d | 910 | unsigned long count; |
b8990fbf | 911 | struct multi_pack_index *m; |
0abe14f6 JT |
912 | struct packed_git *p; |
913 | ||
5038de19 | 914 | prepare_packed_git(r); |
0abe14f6 | 915 | count = 0; |
5038de19 | 916 | for (m = get_multi_pack_index(r); m; m = m->next) |
b8990fbf | 917 | count += m->num_objects; |
5038de19 | 918 | for (p = r->objects->packed_git; p; p = p->next) { |
0abe14f6 JT |
919 | if (open_pack_index(p)) |
920 | continue; | |
921 | count += p->num_objects; | |
922 | } | |
5038de19 | 923 | r->objects->approximate_object_count = count; |
67bb65de | 924 | r->objects->approximate_object_count_valid = 1; |
0abe14f6 | 925 | } |
5038de19 | 926 | return r->objects->approximate_object_count; |
0abe14f6 JT |
927 | } |
928 | ||
929 | static void *get_next_packed_git(const void *p) | |
930 | { | |
931 | return ((const struct packed_git *)p)->next; | |
932 | } | |
933 | ||
934 | static void set_next_packed_git(void *p, void *next) | |
935 | { | |
936 | ((struct packed_git *)p)->next = next; | |
937 | } | |
938 | ||
939 | static int sort_pack(const void *a_, const void *b_) | |
940 | { | |
941 | const struct packed_git *a = a_; | |
942 | const struct packed_git *b = b_; | |
943 | int st; | |
944 | ||
945 | /* | |
946 | * Local packs tend to contain objects specific to our | |
947 | * variant of the project than remote ones. In addition, | |
948 | * remote ones could be on a network mounted filesystem. | |
949 | * Favor local ones for these reasons. | |
950 | */ | |
951 | st = a->pack_local - b->pack_local; | |
952 | if (st) | |
953 | return -st; | |
954 | ||
955 | /* | |
956 | * Younger packs tend to contain more recent objects, | |
957 | * and more recent objects tend to get accessed more | |
958 | * often. | |
959 | */ | |
960 | if (a->mtime < b->mtime) | |
961 | return 1; | |
962 | else if (a->mtime == b->mtime) | |
963 | return 0; | |
964 | return -1; | |
965 | } | |
966 | ||
c235beac | 967 | static void rearrange_packed_git(struct repository *r) |
0abe14f6 | 968 | { |
c235beac SB |
969 | r->objects->packed_git = llist_mergesort( |
970 | r->objects->packed_git, get_next_packed_git, | |
a80d72db | 971 | set_next_packed_git, sort_pack); |
0abe14f6 JT |
972 | } |
973 | ||
804be796 | 974 | static void prepare_packed_git_mru(struct repository *r) |
0abe14f6 JT |
975 | { |
976 | struct packed_git *p; | |
977 | ||
804be796 | 978 | INIT_LIST_HEAD(&r->objects->packed_git_mru); |
ec2dd32c | 979 | |
804be796 SB |
980 | for (p = r->objects->packed_git; p; p = p->next) |
981 | list_add_tail(&p->mru, &r->objects->packed_git_mru); | |
0abe14f6 JT |
982 | } |
983 | ||
464416a2 | 984 | static void prepare_packed_git(struct repository *r) |
0abe14f6 | 985 | { |
263db403 | 986 | struct object_directory *odb; |
0abe14f6 | 987 | |
0f90a9f2 | 988 | if (r->objects->packed_git_initialized) |
0abe14f6 | 989 | return; |
f0eaf638 | 990 | |
0f90a9f2 | 991 | prepare_alt_odb(r); |
f0eaf638 JK |
992 | for (odb = r->objects->odb; odb; odb = odb->next) { |
993 | int local = (odb == r->objects->odb); | |
994 | prepare_multi_pack_index_one(r, odb->path, local); | |
995 | prepare_packed_git_one(r, odb->path, local); | |
c4d25228 | 996 | } |
0f90a9f2 | 997 | rearrange_packed_git(r); |
0bff5269 | 998 | |
0f90a9f2 SB |
999 | prepare_packed_git_mru(r); |
1000 | r->objects->packed_git_initialized = 1; | |
0abe14f6 JT |
1001 | } |
1002 | ||
4c2a13b4 | 1003 | void reprepare_packed_git(struct repository *r) |
0abe14f6 | 1004 | { |
3a2e0824 JK |
1005 | struct object_directory *odb; |
1006 | ||
6c307626 | 1007 | obj_read_lock(); |
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); | |
6c307626 | 1014 | obj_read_unlock(); |
0abe14f6 | 1015 | } |
32b42e15 | 1016 | |
a80d72db SB |
1017 | struct packed_git *get_packed_git(struct repository *r) |
1018 | { | |
464416a2 | 1019 | prepare_packed_git(r); |
a80d72db SB |
1020 | return r->objects->packed_git; |
1021 | } | |
1022 | ||
8aac67a1 DS |
1023 | struct multi_pack_index *get_multi_pack_index(struct repository *r) |
1024 | { | |
1025 | prepare_packed_git(r); | |
1026 | return r->objects->multi_pack_index; | |
1027 | } | |
1028 | ||
59552fb3 TB |
1029 | struct multi_pack_index *get_local_multi_pack_index(struct repository *r) |
1030 | { | |
1031 | struct multi_pack_index *m = get_multi_pack_index(r); | |
1032 | ||
1033 | /* no need to iterate; we always put the local one first (if any) */ | |
1034 | if (m && m->local) | |
1035 | return m; | |
1036 | ||
1037 | return NULL; | |
1038 | } | |
1039 | ||
0bff5269 DS |
1040 | struct packed_git *get_all_packs(struct repository *r) |
1041 | { | |
af96fe33 | 1042 | struct multi_pack_index *m; |
0bff5269 | 1043 | |
af96fe33 DS |
1044 | prepare_packed_git(r); |
1045 | for (m = r->objects->multi_pack_index; m; m = m->next) { | |
1046 | uint32_t i; | |
1047 | for (i = 0; i < m->num_packs; i++) | |
1048 | prepare_midx_pack(r, m, i); | |
0bff5269 DS |
1049 | } |
1050 | ||
af96fe33 | 1051 | return r->objects->packed_git; |
0bff5269 DS |
1052 | } |
1053 | ||
a80d72db SB |
1054 | struct list_head *get_packed_git_mru(struct repository *r) |
1055 | { | |
464416a2 | 1056 | prepare_packed_git(r); |
a80d72db SB |
1057 | return &r->objects->packed_git_mru; |
1058 | } | |
1059 | ||
32b42e15 JT |
1060 | unsigned long unpack_object_header_buffer(const unsigned char *buf, |
1061 | unsigned long len, enum object_type *type, unsigned long *sizep) | |
1062 | { | |
1063 | unsigned shift; | |
d6a09e79 | 1064 | size_t size, c; |
32b42e15 JT |
1065 | unsigned long used = 0; |
1066 | ||
1067 | c = buf[used++]; | |
1068 | *type = (c >> 4) & 7; | |
1069 | size = c & 15; | |
1070 | shift = 4; | |
1071 | while (c & 0x80) { | |
a5c97b01 | 1072 | if (len <= used || (bitsizeof(long) - 7) < shift) { |
32b42e15 JT |
1073 | error("bad object header"); |
1074 | size = used = 0; | |
1075 | break; | |
1076 | } | |
1077 | c = buf[used++]; | |
d6a09e79 | 1078 | size = st_add(size, st_left_shift(c & 0x7f, shift)); |
32b42e15 JT |
1079 | shift += 7; |
1080 | } | |
d6a09e79 | 1081 | *sizep = cast_size_t_to_ulong(size); |
32b42e15 JT |
1082 | return used; |
1083 | } | |
7b3aa75d JT |
1084 | |
1085 | unsigned long get_size_from_delta(struct packed_git *p, | |
1086 | struct pack_window **w_curs, | |
1087 | off_t curpos) | |
1088 | { | |
1089 | const unsigned char *data; | |
1090 | unsigned char delta_head[20], *in; | |
1091 | git_zstream stream; | |
1092 | int st; | |
1093 | ||
1094 | memset(&stream, 0, sizeof(stream)); | |
1095 | stream.next_out = delta_head; | |
1096 | stream.avail_out = sizeof(delta_head); | |
1097 | ||
1098 | git_inflate_init(&stream); | |
1099 | do { | |
1100 | in = use_pack(p, w_curs, curpos, &stream.avail_in); | |
1101 | stream.next_in = in; | |
31877c9a MT |
1102 | /* |
1103 | * Note: the window section returned by use_pack() must be | |
1104 | * available throughout git_inflate()'s unlocked execution. To | |
1105 | * ensure no other thread will modify the window in the | |
1106 | * meantime, we rely on the packed_window.inuse_cnt. This | |
1107 | * counter is incremented before window reading and checked | |
1108 | * before window disposal. | |
1109 | * | |
1110 | * Other worrying sections could be the call to close_pack_fd(), | |
1111 | * which can close packs even with in-use windows, and to | |
1112 | * reprepare_packed_git(). Regarding the former, mmap doc says: | |
1113 | * "closing the file descriptor does not unmap the region". And | |
1114 | * for the latter, it won't re-open already available packs. | |
1115 | */ | |
1116 | obj_read_unlock(); | |
7b3aa75d | 1117 | st = git_inflate(&stream, Z_FINISH); |
31877c9a | 1118 | obj_read_lock(); |
7b3aa75d JT |
1119 | curpos += stream.next_in - in; |
1120 | } while ((st == Z_OK || st == Z_BUF_ERROR) && | |
1121 | stream.total_out < sizeof(delta_head)); | |
1122 | git_inflate_end(&stream); | |
1123 | if ((st != Z_STREAM_END) && stream.total_out != sizeof(delta_head)) { | |
1124 | error("delta data unpack-initial failed"); | |
1125 | return 0; | |
1126 | } | |
1127 | ||
1128 | /* Examine the initial part of the delta to figure out | |
1129 | * the result size. | |
1130 | */ | |
1131 | data = delta_head; | |
1132 | ||
1133 | /* ignore base size */ | |
1134 | get_delta_hdr_size(&data, delta_head+sizeof(delta_head)); | |
1135 | ||
1136 | /* Read the result size */ | |
1137 | return get_delta_hdr_size(&data, delta_head+sizeof(delta_head)); | |
1138 | } | |
3588dd6e JT |
1139 | |
1140 | int unpack_object_header(struct packed_git *p, | |
1141 | struct pack_window **w_curs, | |
1142 | off_t *curpos, | |
1143 | unsigned long *sizep) | |
1144 | { | |
1145 | unsigned char *base; | |
1146 | unsigned long left; | |
1147 | unsigned long used; | |
1148 | enum object_type type; | |
1149 | ||
1150 | /* use_pack() assures us we have [base, base + 20) available | |
1151 | * as a range that we can look at. (Its actually the hash | |
1152 | * size that is assured.) With our object header encoding | |
1153 | * the maximum deflated object size is 2^137, which is just | |
1154 | * insane, so we know won't exceed what we have been given. | |
1155 | */ | |
1156 | base = use_pack(p, w_curs, *curpos, &left); | |
1157 | used = unpack_object_header_buffer(base, left, &type, sizep); | |
1158 | if (!used) { | |
1159 | type = OBJ_BAD; | |
1160 | } else | |
1161 | *curpos += used; | |
1162 | ||
1163 | return type; | |
1164 | } | |
f1d8130b | 1165 | |
751530de | 1166 | void mark_bad_packed_object(struct packed_git *p, const struct object_id *oid) |
f1d8130b | 1167 | { |
09ef6617 | 1168 | oidset_insert(&p->bad_objects, oid); |
f1d8130b JT |
1169 | } |
1170 | ||
33b94066 | 1171 | const struct packed_git *has_packed_and_bad(struct repository *r, |
7407d733 | 1172 | const struct object_id *oid) |
f1d8130b JT |
1173 | { |
1174 | struct packed_git *p; | |
f1d8130b | 1175 | |
33b94066 | 1176 | for (p = r->objects->packed_git; p; p = p->next) |
09ef6617 RS |
1177 | if (oidset_contains(&p->bad_objects, oid)) |
1178 | return p; | |
f1d8130b JT |
1179 | return NULL; |
1180 | } | |
1181 | ||
56d9cbe6 JK |
1182 | off_t get_delta_base(struct packed_git *p, |
1183 | struct pack_window **w_curs, | |
1184 | off_t *curpos, | |
1185 | enum object_type type, | |
1186 | off_t delta_obj_offset) | |
f1d8130b JT |
1187 | { |
1188 | unsigned char *base_info = use_pack(p, w_curs, *curpos, NULL); | |
1189 | off_t base_offset; | |
1190 | ||
1191 | /* use_pack() assured us we have [base_info, base_info + 20) | |
1192 | * as a range that we can look at without walking off the | |
1193 | * end of the mapped window. Its actually the hash size | |
1194 | * that is assured. An OFS_DELTA longer than the hash size | |
1195 | * is stupid, as then a REF_DELTA would be smaller to store. | |
1196 | */ | |
1197 | if (type == OBJ_OFS_DELTA) { | |
1198 | unsigned used = 0; | |
1199 | unsigned char c = base_info[used++]; | |
1200 | base_offset = c & 127; | |
1201 | while (c & 128) { | |
1202 | base_offset += 1; | |
1203 | if (!base_offset || MSB(base_offset, 7)) | |
1204 | return 0; /* overflow */ | |
1205 | c = base_info[used++]; | |
1206 | base_offset = (base_offset << 7) + (c & 127); | |
1207 | } | |
1208 | base_offset = delta_obj_offset - base_offset; | |
1209 | if (base_offset <= 0 || base_offset >= delta_obj_offset) | |
1210 | return 0; /* out of bound */ | |
1211 | *curpos += used; | |
1212 | } else if (type == OBJ_REF_DELTA) { | |
1213 | /* The base entry _must_ be in the same pack */ | |
1214 | base_offset = find_pack_entry_one(base_info, p); | |
37fec86a | 1215 | *curpos += the_hash_algo->rawsz; |
f1d8130b JT |
1216 | } else |
1217 | die("I am totally screwed"); | |
1218 | return base_offset; | |
1219 | } | |
1220 | ||
1221 | /* | |
1222 | * Like get_delta_base above, but we return the sha1 instead of the pack | |
1223 | * offset. This means it is cheaper for REF deltas (we do not have to do | |
1224 | * the final object lookup), but more expensive for OFS deltas (we | |
1225 | * have to load the revidx to convert the offset back into a sha1). | |
1226 | */ | |
6ac9760a JK |
1227 | static int get_delta_base_oid(struct packed_git *p, |
1228 | struct pack_window **w_curs, | |
1229 | off_t curpos, | |
1230 | struct object_id *oid, | |
1231 | enum object_type type, | |
1232 | off_t delta_obj_offset) | |
f1d8130b JT |
1233 | { |
1234 | if (type == OBJ_REF_DELTA) { | |
1235 | unsigned char *base = use_pack(p, w_curs, curpos, NULL); | |
6ac9760a JK |
1236 | oidread(oid, base); |
1237 | return 0; | |
f1d8130b | 1238 | } else if (type == OBJ_OFS_DELTA) { |
45bef5c0 | 1239 | uint32_t base_pos; |
f1d8130b JT |
1240 | off_t base_offset = get_delta_base(p, w_curs, &curpos, |
1241 | type, delta_obj_offset); | |
1242 | ||
1243 | if (!base_offset) | |
6ac9760a | 1244 | return -1; |
f1d8130b | 1245 | |
45bef5c0 | 1246 | if (offset_to_pack_pos(p, base_offset, &base_pos) < 0) |
6ac9760a | 1247 | return -1; |
f1d8130b | 1248 | |
45bef5c0 TB |
1249 | return nth_packed_object_id(oid, p, |
1250 | pack_pos_to_index(p, base_pos)); | |
f1d8130b | 1251 | } else |
6ac9760a | 1252 | return -1; |
f1d8130b JT |
1253 | } |
1254 | ||
9d98354f SB |
1255 | static int retry_bad_packed_offset(struct repository *r, |
1256 | struct packed_git *p, | |
1257 | off_t obj_offset) | |
f1d8130b JT |
1258 | { |
1259 | int type; | |
3a3f54dd | 1260 | uint32_t pos; |
d169d664 | 1261 | struct object_id oid; |
3a3f54dd | 1262 | if (offset_to_pack_pos(p, obj_offset, &pos) < 0) |
f1d8130b | 1263 | return OBJ_BAD; |
3a3f54dd | 1264 | nth_packed_object_id(&oid, p, pack_pos_to_index(p, pos)); |
751530de | 1265 | mark_bad_packed_object(p, &oid); |
9d98354f | 1266 | type = oid_object_info(r, &oid, NULL); |
f1d8130b JT |
1267 | if (type <= OBJ_NONE) |
1268 | return OBJ_BAD; | |
1269 | return type; | |
1270 | } | |
1271 | ||
1272 | #define POI_STACK_PREALLOC 64 | |
1273 | ||
9d98354f SB |
1274 | static enum object_type packed_to_object_type(struct repository *r, |
1275 | struct packed_git *p, | |
f1d8130b JT |
1276 | off_t obj_offset, |
1277 | enum object_type type, | |
1278 | struct pack_window **w_curs, | |
1279 | off_t curpos) | |
1280 | { | |
1281 | off_t small_poi_stack[POI_STACK_PREALLOC]; | |
1282 | off_t *poi_stack = small_poi_stack; | |
1283 | int poi_stack_nr = 0, poi_stack_alloc = POI_STACK_PREALLOC; | |
1284 | ||
1285 | while (type == OBJ_OFS_DELTA || type == OBJ_REF_DELTA) { | |
1286 | off_t base_offset; | |
1287 | unsigned long size; | |
1288 | /* Push the object we're going to leave behind */ | |
1289 | if (poi_stack_nr >= poi_stack_alloc && poi_stack == small_poi_stack) { | |
1290 | poi_stack_alloc = alloc_nr(poi_stack_nr); | |
1291 | ALLOC_ARRAY(poi_stack, poi_stack_alloc); | |
921d49be | 1292 | COPY_ARRAY(poi_stack, small_poi_stack, poi_stack_nr); |
f1d8130b JT |
1293 | } else { |
1294 | ALLOC_GROW(poi_stack, poi_stack_nr+1, poi_stack_alloc); | |
1295 | } | |
1296 | poi_stack[poi_stack_nr++] = obj_offset; | |
1297 | /* If parsing the base offset fails, just unwind */ | |
1298 | base_offset = get_delta_base(p, w_curs, &curpos, type, obj_offset); | |
1299 | if (!base_offset) | |
1300 | goto unwind; | |
1301 | curpos = obj_offset = base_offset; | |
1302 | type = unpack_object_header(p, w_curs, &curpos, &size); | |
1303 | if (type <= OBJ_NONE) { | |
1304 | /* If getting the base itself fails, we first | |
1305 | * retry the base, otherwise unwind */ | |
9d98354f | 1306 | type = retry_bad_packed_offset(r, p, base_offset); |
f1d8130b JT |
1307 | if (type > OBJ_NONE) |
1308 | goto out; | |
1309 | goto unwind; | |
1310 | } | |
1311 | } | |
1312 | ||
1313 | switch (type) { | |
1314 | case OBJ_BAD: | |
1315 | case OBJ_COMMIT: | |
1316 | case OBJ_TREE: | |
1317 | case OBJ_BLOB: | |
1318 | case OBJ_TAG: | |
1319 | break; | |
1320 | default: | |
1321 | error("unknown object type %i at offset %"PRIuMAX" in %s", | |
1322 | type, (uintmax_t)obj_offset, p->pack_name); | |
1323 | type = OBJ_BAD; | |
1324 | } | |
1325 | ||
1326 | out: | |
1327 | if (poi_stack != small_poi_stack) | |
1328 | free(poi_stack); | |
1329 | return type; | |
1330 | ||
1331 | unwind: | |
1332 | while (poi_stack_nr) { | |
1333 | obj_offset = poi_stack[--poi_stack_nr]; | |
9d98354f | 1334 | type = retry_bad_packed_offset(r, p, obj_offset); |
f1d8130b JT |
1335 | if (type > OBJ_NONE) |
1336 | goto out; | |
1337 | } | |
1338 | type = OBJ_BAD; | |
1339 | goto out; | |
1340 | } | |
1341 | ||
1342 | static struct hashmap delta_base_cache; | |
1343 | static size_t delta_base_cached; | |
1344 | ||
1345 | static LIST_HEAD(delta_base_cache_lru); | |
1346 | ||
1347 | struct delta_base_cache_key { | |
1348 | struct packed_git *p; | |
1349 | off_t base_offset; | |
1350 | }; | |
1351 | ||
1352 | struct delta_base_cache_entry { | |
d0a48a0a | 1353 | struct hashmap_entry ent; |
f1d8130b JT |
1354 | struct delta_base_cache_key key; |
1355 | struct list_head lru; | |
1356 | void *data; | |
1357 | unsigned long size; | |
1358 | enum object_type type; | |
1359 | }; | |
1360 | ||
1361 | static unsigned int pack_entry_hash(struct packed_git *p, off_t base_offset) | |
1362 | { | |
1363 | unsigned int hash; | |
1364 | ||
1365 | hash = (unsigned int)(intptr_t)p + (unsigned int)base_offset; | |
1366 | hash += (hash >> 8) + (hash >> 16); | |
1367 | return hash; | |
1368 | } | |
1369 | ||
1370 | static struct delta_base_cache_entry * | |
1371 | get_delta_base_cache_entry(struct packed_git *p, off_t base_offset) | |
1372 | { | |
f23a4651 | 1373 | struct hashmap_entry entry, *e; |
f1d8130b JT |
1374 | struct delta_base_cache_key key; |
1375 | ||
1376 | if (!delta_base_cache.cmpfn) | |
1377 | return NULL; | |
1378 | ||
1379 | hashmap_entry_init(&entry, pack_entry_hash(p, base_offset)); | |
1380 | key.p = p; | |
1381 | key.base_offset = base_offset; | |
f23a4651 EW |
1382 | e = hashmap_get(&delta_base_cache, &entry, &key); |
1383 | return e ? container_of(e, struct delta_base_cache_entry, ent) : NULL; | |
f1d8130b JT |
1384 | } |
1385 | ||
1386 | static int delta_base_cache_key_eq(const struct delta_base_cache_key *a, | |
1387 | const struct delta_base_cache_key *b) | |
1388 | { | |
1389 | return a->p == b->p && a->base_offset == b->base_offset; | |
1390 | } | |
1391 | ||
1392 | static int delta_base_cache_hash_cmp(const void *unused_cmp_data, | |
939af16e EW |
1393 | const struct hashmap_entry *va, |
1394 | const struct hashmap_entry *vb, | |
f1d8130b JT |
1395 | const void *vkey) |
1396 | { | |
939af16e | 1397 | const struct delta_base_cache_entry *a, *b; |
f1d8130b | 1398 | const struct delta_base_cache_key *key = vkey; |
939af16e EW |
1399 | |
1400 | a = container_of(va, const struct delta_base_cache_entry, ent); | |
1401 | b = container_of(vb, const struct delta_base_cache_entry, ent); | |
1402 | ||
f1d8130b JT |
1403 | if (key) |
1404 | return !delta_base_cache_key_eq(&a->key, key); | |
1405 | else | |
1406 | return !delta_base_cache_key_eq(&a->key, &b->key); | |
1407 | } | |
1408 | ||
1409 | static int in_delta_base_cache(struct packed_git *p, off_t base_offset) | |
1410 | { | |
1411 | return !!get_delta_base_cache_entry(p, base_offset); | |
1412 | } | |
1413 | ||
1414 | /* | |
1415 | * Remove the entry from the cache, but do _not_ free the associated | |
1416 | * entry data. The caller takes ownership of the "data" buffer, and | |
1417 | * should copy out any fields it wants before detaching. | |
1418 | */ | |
1419 | static void detach_delta_base_cache_entry(struct delta_base_cache_entry *ent) | |
1420 | { | |
28ee7941 | 1421 | hashmap_remove(&delta_base_cache, &ent->ent, &ent->key); |
f1d8130b JT |
1422 | list_del(&ent->lru); |
1423 | delta_base_cached -= ent->size; | |
1424 | free(ent); | |
1425 | } | |
1426 | ||
9d98354f SB |
1427 | static void *cache_or_unpack_entry(struct repository *r, struct packed_git *p, |
1428 | off_t base_offset, unsigned long *base_size, | |
1429 | enum object_type *type) | |
f1d8130b JT |
1430 | { |
1431 | struct delta_base_cache_entry *ent; | |
1432 | ||
1433 | ent = get_delta_base_cache_entry(p, base_offset); | |
1434 | if (!ent) | |
9d98354f | 1435 | return unpack_entry(r, p, base_offset, type, base_size); |
f1d8130b JT |
1436 | |
1437 | if (type) | |
1438 | *type = ent->type; | |
1439 | if (base_size) | |
1440 | *base_size = ent->size; | |
1441 | return xmemdupz(ent->data, ent->size); | |
1442 | } | |
1443 | ||
1444 | static inline void release_delta_base_cache(struct delta_base_cache_entry *ent) | |
1445 | { | |
1446 | free(ent->data); | |
1447 | detach_delta_base_cache_entry(ent); | |
1448 | } | |
1449 | ||
1450 | void clear_delta_base_cache(void) | |
1451 | { | |
1452 | struct list_head *lru, *tmp; | |
1453 | list_for_each_safe(lru, tmp, &delta_base_cache_lru) { | |
1454 | struct delta_base_cache_entry *entry = | |
1455 | list_entry(lru, struct delta_base_cache_entry, lru); | |
1456 | release_delta_base_cache(entry); | |
1457 | } | |
1458 | } | |
1459 | ||
1460 | static void add_delta_base_cache(struct packed_git *p, off_t base_offset, | |
1461 | void *base, unsigned long base_size, enum object_type type) | |
1462 | { | |
bda959c4 | 1463 | struct delta_base_cache_entry *ent; |
f1d8130b JT |
1464 | struct list_head *lru, *tmp; |
1465 | ||
31877c9a MT |
1466 | /* |
1467 | * Check required to avoid redundant entries when more than one thread | |
1468 | * is unpacking the same object, in unpack_entry() (since its phases I | |
1469 | * and III might run concurrently across multiple threads). | |
1470 | */ | |
bda959c4 MT |
1471 | if (in_delta_base_cache(p, base_offset)) { |
1472 | free(base); | |
31877c9a | 1473 | return; |
bda959c4 | 1474 | } |
31877c9a | 1475 | |
f1d8130b JT |
1476 | delta_base_cached += base_size; |
1477 | ||
1478 | list_for_each_safe(lru, tmp, &delta_base_cache_lru) { | |
1479 | struct delta_base_cache_entry *f = | |
1480 | list_entry(lru, struct delta_base_cache_entry, lru); | |
1481 | if (delta_base_cached <= delta_base_cache_limit) | |
1482 | break; | |
1483 | release_delta_base_cache(f); | |
1484 | } | |
1485 | ||
bda959c4 | 1486 | ent = xmalloc(sizeof(*ent)); |
f1d8130b JT |
1487 | ent->key.p = p; |
1488 | ent->key.base_offset = base_offset; | |
1489 | ent->type = type; | |
1490 | ent->data = base; | |
1491 | ent->size = base_size; | |
1492 | list_add_tail(&ent->lru, &delta_base_cache_lru); | |
1493 | ||
1494 | if (!delta_base_cache.cmpfn) | |
1495 | hashmap_init(&delta_base_cache, delta_base_cache_hash_cmp, NULL, 0); | |
d22245a2 | 1496 | hashmap_entry_init(&ent->ent, pack_entry_hash(p, base_offset)); |
b94e5c1d | 1497 | hashmap_add(&delta_base_cache, &ent->ent); |
f1d8130b JT |
1498 | } |
1499 | ||
9d98354f SB |
1500 | int packed_object_info(struct repository *r, struct packed_git *p, |
1501 | off_t obj_offset, struct object_info *oi) | |
f1d8130b JT |
1502 | { |
1503 | struct pack_window *w_curs = NULL; | |
1504 | unsigned long size; | |
1505 | off_t curpos = obj_offset; | |
1506 | enum object_type type; | |
1507 | ||
1508 | /* | |
1509 | * We always get the representation type, but only convert it to | |
1510 | * a "real" type later if the caller is interested. | |
1511 | */ | |
1512 | if (oi->contentp) { | |
9d98354f | 1513 | *oi->contentp = cache_or_unpack_entry(r, p, obj_offset, oi->sizep, |
f1d8130b JT |
1514 | &type); |
1515 | if (!*oi->contentp) | |
1516 | type = OBJ_BAD; | |
1517 | } else { | |
1518 | type = unpack_object_header(p, &w_curs, &curpos, &size); | |
1519 | } | |
1520 | ||
1521 | if (!oi->contentp && oi->sizep) { | |
1522 | if (type == OBJ_OFS_DELTA || type == OBJ_REF_DELTA) { | |
1523 | off_t tmp_pos = curpos; | |
1524 | off_t base_offset = get_delta_base(p, &w_curs, &tmp_pos, | |
1525 | type, obj_offset); | |
1526 | if (!base_offset) { | |
1527 | type = OBJ_BAD; | |
1528 | goto out; | |
1529 | } | |
1530 | *oi->sizep = get_size_from_delta(p, &w_curs, tmp_pos); | |
1531 | if (*oi->sizep == 0) { | |
1532 | type = OBJ_BAD; | |
1533 | goto out; | |
1534 | } | |
1535 | } else { | |
1536 | *oi->sizep = size; | |
1537 | } | |
1538 | } | |
1539 | ||
1540 | if (oi->disk_sizep) { | |
fc150caf TB |
1541 | uint32_t pos; |
1542 | if (offset_to_pack_pos(p, obj_offset, &pos) < 0) { | |
1543 | error("could not find object at offset %"PRIuMAX" " | |
1544 | "in pack %s", (uintmax_t)obj_offset, p->pack_name); | |
1545 | type = OBJ_BAD; | |
1546 | goto out; | |
1547 | } | |
1548 | ||
1549 | *oi->disk_sizep = pack_pos_to_offset(p, pos + 1) - obj_offset; | |
f1d8130b JT |
1550 | } |
1551 | ||
6ca32f47 | 1552 | if (oi->typep || oi->type_name) { |
f1d8130b | 1553 | enum object_type ptot; |
9d98354f | 1554 | ptot = packed_to_object_type(r, p, obj_offset, |
144f4948 | 1555 | type, &w_curs, curpos); |
f1d8130b JT |
1556 | if (oi->typep) |
1557 | *oi->typep = ptot; | |
6ca32f47 | 1558 | if (oi->type_name) { |
debca9d2 | 1559 | const char *tn = type_name(ptot); |
f1d8130b | 1560 | if (tn) |
6ca32f47 | 1561 | strbuf_addstr(oi->type_name, tn); |
f1d8130b JT |
1562 | } |
1563 | if (ptot < 0) { | |
1564 | type = OBJ_BAD; | |
1565 | goto out; | |
1566 | } | |
1567 | } | |
1568 | ||
b99b6bcc | 1569 | if (oi->delta_base_oid) { |
f1d8130b | 1570 | if (type == OBJ_OFS_DELTA || type == OBJ_REF_DELTA) { |
6ac9760a JK |
1571 | if (get_delta_base_oid(p, &w_curs, curpos, |
1572 | oi->delta_base_oid, | |
1573 | type, obj_offset) < 0) { | |
f1d8130b JT |
1574 | type = OBJ_BAD; |
1575 | goto out; | |
1576 | } | |
f1d8130b | 1577 | } else |
b99b6bcc | 1578 | oidclr(oi->delta_base_oid); |
f1d8130b JT |
1579 | } |
1580 | ||
1581 | oi->whence = in_delta_base_cache(p, obj_offset) ? OI_DBCACHED : | |
1582 | OI_PACKED; | |
1583 | ||
1584 | out: | |
1585 | unuse_pack(&w_curs); | |
1586 | return type; | |
1587 | } | |
1588 | ||
1589 | static void *unpack_compressed_entry(struct packed_git *p, | |
1590 | struct pack_window **w_curs, | |
1591 | off_t curpos, | |
1592 | unsigned long size) | |
1593 | { | |
1594 | int st; | |
1595 | git_zstream stream; | |
1596 | unsigned char *buffer, *in; | |
1597 | ||
1598 | buffer = xmallocz_gently(size); | |
1599 | if (!buffer) | |
1600 | return NULL; | |
1601 | memset(&stream, 0, sizeof(stream)); | |
1602 | stream.next_out = buffer; | |
1603 | stream.avail_out = size + 1; | |
1604 | ||
1605 | git_inflate_init(&stream); | |
1606 | do { | |
1607 | in = use_pack(p, w_curs, curpos, &stream.avail_in); | |
1608 | stream.next_in = in; | |
31877c9a MT |
1609 | /* |
1610 | * Note: we must ensure the window section returned by | |
1611 | * use_pack() will be available throughout git_inflate()'s | |
1612 | * unlocked execution. Please refer to the comment at | |
1613 | * get_size_from_delta() to see how this is done. | |
1614 | */ | |
1615 | obj_read_unlock(); | |
f1d8130b | 1616 | st = git_inflate(&stream, Z_FINISH); |
31877c9a | 1617 | obj_read_lock(); |
f1d8130b JT |
1618 | if (!stream.avail_out) |
1619 | break; /* the payload is larger than it should be */ | |
1620 | curpos += stream.next_in - in; | |
1621 | } while (st == Z_OK || st == Z_BUF_ERROR); | |
1622 | git_inflate_end(&stream); | |
1623 | if ((st != Z_STREAM_END) || stream.total_out != size) { | |
1624 | free(buffer); | |
1625 | return NULL; | |
1626 | } | |
1627 | ||
b611396e JL |
1628 | /* versions of zlib can clobber unconsumed portion of outbuf */ |
1629 | buffer[size] = '\0'; | |
1630 | ||
f1d8130b JT |
1631 | return buffer; |
1632 | } | |
1633 | ||
1634 | static void write_pack_access_log(struct packed_git *p, off_t obj_offset) | |
1635 | { | |
1636 | static struct trace_key pack_access = TRACE_KEY_INIT(PACK_ACCESS); | |
1637 | trace_printf_key(&pack_access, "%s %"PRIuMAX"\n", | |
1638 | p->pack_name, (uintmax_t)obj_offset); | |
1639 | } | |
1640 | ||
1641 | int do_check_packed_object_crc; | |
1642 | ||
1643 | #define UNPACK_ENTRY_STACK_PREALLOC 64 | |
1644 | struct unpack_entry_stack_ent { | |
1645 | off_t obj_offset; | |
1646 | off_t curpos; | |
1647 | unsigned long size; | |
1648 | }; | |
1649 | ||
9d98354f SB |
1650 | static void *read_object(struct repository *r, |
1651 | const struct object_id *oid, | |
1652 | enum object_type *type, | |
f1d8130b JT |
1653 | unsigned long *size) |
1654 | { | |
1655 | struct object_info oi = OBJECT_INFO_INIT; | |
1656 | void *content; | |
1657 | oi.typep = type; | |
1658 | oi.sizep = size; | |
1659 | oi.contentp = &content; | |
1660 | ||
9d98354f | 1661 | if (oid_object_info_extended(r, oid, &oi, 0) < 0) |
f1d8130b JT |
1662 | return NULL; |
1663 | return content; | |
1664 | } | |
1665 | ||
9d98354f | 1666 | void *unpack_entry(struct repository *r, struct packed_git *p, off_t obj_offset, |
f1d8130b JT |
1667 | enum object_type *final_type, unsigned long *final_size) |
1668 | { | |
1669 | struct pack_window *w_curs = NULL; | |
1670 | off_t curpos = obj_offset; | |
1671 | void *data = NULL; | |
1672 | unsigned long size; | |
1673 | enum object_type type; | |
1674 | struct unpack_entry_stack_ent small_delta_stack[UNPACK_ENTRY_STACK_PREALLOC]; | |
1675 | struct unpack_entry_stack_ent *delta_stack = small_delta_stack; | |
1676 | int delta_stack_nr = 0, delta_stack_alloc = UNPACK_ENTRY_STACK_PREALLOC; | |
1677 | int base_from_cache = 0; | |
1678 | ||
1679 | write_pack_access_log(p, obj_offset); | |
1680 | ||
1681 | /* PHASE 1: drill down to the innermost base object */ | |
1682 | for (;;) { | |
1683 | off_t base_offset; | |
1684 | int i; | |
1685 | struct delta_base_cache_entry *ent; | |
1686 | ||
1687 | ent = get_delta_base_cache_entry(p, curpos); | |
1688 | if (ent) { | |
1689 | type = ent->type; | |
1690 | data = ent->data; | |
1691 | size = ent->size; | |
1692 | detach_delta_base_cache_entry(ent); | |
1693 | base_from_cache = 1; | |
1694 | break; | |
1695 | } | |
1696 | ||
1697 | if (do_check_packed_object_crc && p->index_version > 1) { | |
0a7e3642 TB |
1698 | uint32_t pack_pos, index_pos; |
1699 | off_t len; | |
1700 | ||
1701 | if (offset_to_pack_pos(p, obj_offset, &pack_pos) < 0) { | |
1702 | error("could not find object at offset %"PRIuMAX" in pack %s", | |
1703 | (uintmax_t)obj_offset, p->pack_name); | |
1704 | data = NULL; | |
1705 | goto out; | |
1706 | } | |
1707 | ||
1708 | len = pack_pos_to_offset(p, pack_pos + 1) - obj_offset; | |
1709 | index_pos = pack_pos_to_index(p, pack_pos); | |
1710 | if (check_pack_crc(p, &w_curs, obj_offset, len, index_pos)) { | |
4310b0c4 | 1711 | struct object_id oid; |
0a7e3642 | 1712 | nth_packed_object_id(&oid, p, index_pos); |
f1d8130b | 1713 | error("bad packed object CRC for %s", |
4310b0c4 | 1714 | oid_to_hex(&oid)); |
751530de | 1715 | mark_bad_packed_object(p, &oid); |
f1d8130b JT |
1716 | data = NULL; |
1717 | goto out; | |
1718 | } | |
1719 | } | |
1720 | ||
1721 | type = unpack_object_header(p, &w_curs, &curpos, &size); | |
1722 | if (type != OBJ_OFS_DELTA && type != OBJ_REF_DELTA) | |
1723 | break; | |
1724 | ||
1725 | base_offset = get_delta_base(p, &w_curs, &curpos, type, obj_offset); | |
1726 | if (!base_offset) { | |
1727 | error("failed to validate delta base reference " | |
1728 | "at offset %"PRIuMAX" from %s", | |
1729 | (uintmax_t)curpos, p->pack_name); | |
1730 | /* bail to phase 2, in hopes of recovery */ | |
1731 | data = NULL; | |
1732 | break; | |
1733 | } | |
1734 | ||
1735 | /* push object, proceed to base */ | |
1736 | if (delta_stack_nr >= delta_stack_alloc | |
1737 | && delta_stack == small_delta_stack) { | |
1738 | delta_stack_alloc = alloc_nr(delta_stack_nr); | |
1739 | ALLOC_ARRAY(delta_stack, delta_stack_alloc); | |
921d49be RS |
1740 | COPY_ARRAY(delta_stack, small_delta_stack, |
1741 | delta_stack_nr); | |
f1d8130b JT |
1742 | } else { |
1743 | ALLOC_GROW(delta_stack, delta_stack_nr+1, delta_stack_alloc); | |
1744 | } | |
1745 | i = delta_stack_nr++; | |
1746 | delta_stack[i].obj_offset = obj_offset; | |
1747 | delta_stack[i].curpos = curpos; | |
1748 | delta_stack[i].size = size; | |
1749 | ||
1750 | curpos = obj_offset = base_offset; | |
1751 | } | |
1752 | ||
1753 | /* PHASE 2: handle the base */ | |
1754 | switch (type) { | |
1755 | case OBJ_OFS_DELTA: | |
1756 | case OBJ_REF_DELTA: | |
1757 | if (data) | |
033abf97 | 1758 | BUG("unpack_entry: left loop at a valid delta"); |
f1d8130b JT |
1759 | break; |
1760 | case OBJ_COMMIT: | |
1761 | case OBJ_TREE: | |
1762 | case OBJ_BLOB: | |
1763 | case OBJ_TAG: | |
1764 | if (!base_from_cache) | |
1765 | data = unpack_compressed_entry(p, &w_curs, curpos, size); | |
1766 | break; | |
1767 | default: | |
1768 | data = NULL; | |
1769 | error("unknown object type %i at offset %"PRIuMAX" in %s", | |
1770 | type, (uintmax_t)obj_offset, p->pack_name); | |
1771 | } | |
1772 | ||
1773 | /* PHASE 3: apply deltas in order */ | |
1774 | ||
1775 | /* invariants: | |
1776 | * 'data' holds the base data, or NULL if there was corruption | |
1777 | */ | |
1778 | while (delta_stack_nr) { | |
1779 | void *delta_data; | |
1780 | void *base = data; | |
1781 | void *external_base = NULL; | |
1782 | unsigned long delta_size, base_size = size; | |
1783 | int i; | |
74b052f8 | 1784 | off_t base_obj_offset = obj_offset; |
f1d8130b JT |
1785 | |
1786 | data = NULL; | |
1787 | ||
f1d8130b JT |
1788 | if (!base) { |
1789 | /* | |
1790 | * We're probably in deep shit, but let's try to fetch | |
1791 | * the required base anyway from another pack or loose. | |
1792 | * This is costly but should happen only in the presence | |
1793 | * of a corrupted pack, and is better than failing outright. | |
1794 | */ | |
0a7e3642 | 1795 | uint32_t pos; |
4310b0c4 | 1796 | struct object_id base_oid; |
0a7e3642 TB |
1797 | if (!(offset_to_pack_pos(p, obj_offset, &pos))) { |
1798 | nth_packed_object_id(&base_oid, p, | |
1799 | pack_pos_to_index(p, pos)); | |
f1d8130b JT |
1800 | error("failed to read delta base object %s" |
1801 | " at offset %"PRIuMAX" from %s", | |
4310b0c4 | 1802 | oid_to_hex(&base_oid), (uintmax_t)obj_offset, |
f1d8130b | 1803 | p->pack_name); |
751530de | 1804 | mark_bad_packed_object(p, &base_oid); |
9d98354f | 1805 | base = read_object(r, &base_oid, &type, &base_size); |
f1d8130b JT |
1806 | external_base = base; |
1807 | } | |
1808 | } | |
1809 | ||
1810 | i = --delta_stack_nr; | |
1811 | obj_offset = delta_stack[i].obj_offset; | |
1812 | curpos = delta_stack[i].curpos; | |
1813 | delta_size = delta_stack[i].size; | |
1814 | ||
1815 | if (!base) | |
1816 | continue; | |
1817 | ||
1818 | delta_data = unpack_compressed_entry(p, &w_curs, curpos, delta_size); | |
1819 | ||
1820 | if (!delta_data) { | |
1821 | error("failed to unpack compressed delta " | |
1822 | "at offset %"PRIuMAX" from %s", | |
1823 | (uintmax_t)curpos, p->pack_name); | |
1824 | data = NULL; | |
74b052f8 MT |
1825 | } else { |
1826 | data = patch_delta(base, base_size, delta_data, | |
1827 | delta_size, &size); | |
f1d8130b | 1828 | |
74b052f8 MT |
1829 | /* |
1830 | * We could not apply the delta; warn the user, but | |
1831 | * keep going. Our failure will be noticed either in | |
1832 | * the next iteration of the loop, or if this is the | |
1833 | * final delta, in the caller when we return NULL. | |
1834 | * Those code paths will take care of making a more | |
1835 | * explicit warning and retrying with another copy of | |
1836 | * the object. | |
1837 | */ | |
1838 | if (!data) | |
1839 | error("failed to apply delta"); | |
1840 | } | |
f1d8130b JT |
1841 | |
1842 | /* | |
74b052f8 MT |
1843 | * We delay adding `base` to the cache until the end of the loop |
1844 | * because unpack_compressed_entry() momentarily releases the | |
1845 | * obj_read_mutex, giving another thread the chance to access | |
1846 | * the cache. Therefore, if `base` was already there, this other | |
1847 | * thread could free() it (e.g. to make space for another entry) | |
1848 | * before we are done using it. | |
f1d8130b | 1849 | */ |
74b052f8 MT |
1850 | if (!external_base) |
1851 | add_delta_base_cache(p, base_obj_offset, base, base_size, type); | |
f1d8130b JT |
1852 | |
1853 | free(delta_data); | |
1854 | free(external_base); | |
1855 | } | |
1856 | ||
1857 | if (final_type) | |
1858 | *final_type = type; | |
1859 | if (final_size) | |
1860 | *final_size = size; | |
1861 | ||
1862 | out: | |
1863 | unuse_pack(&w_curs); | |
1864 | ||
1865 | if (delta_stack != small_delta_stack) | |
1866 | free(delta_stack); | |
1867 | ||
1868 | return data; | |
1869 | } | |
d5a16761 | 1870 | |
3d475f46 DS |
1871 | int bsearch_pack(const struct object_id *oid, const struct packed_git *p, uint32_t *result) |
1872 | { | |
1873 | const unsigned char *index_fanout = p->index_data; | |
1874 | const unsigned char *index_lookup; | |
37fec86a | 1875 | const unsigned int hashsz = the_hash_algo->rawsz; |
3d475f46 DS |
1876 | int index_lookup_width; |
1877 | ||
1878 | if (!index_fanout) | |
1879 | BUG("bsearch_pack called without a valid pack-index"); | |
1880 | ||
1881 | index_lookup = index_fanout + 4 * 256; | |
1882 | if (p->index_version == 1) { | |
37fec86a | 1883 | index_lookup_width = hashsz + 4; |
3d475f46 DS |
1884 | index_lookup += 4; |
1885 | } else { | |
37fec86a | 1886 | index_lookup_width = hashsz; |
3d475f46 DS |
1887 | index_fanout += 8; |
1888 | index_lookup += 8; | |
1889 | } | |
1890 | ||
1891 | return bsearch_hash(oid->hash, (const uint32_t*)index_fanout, | |
1892 | index_lookup, index_lookup_width, result); | |
1893 | } | |
1894 | ||
2fecc48c JK |
1895 | int nth_packed_object_id(struct object_id *oid, |
1896 | struct packed_git *p, | |
1897 | uint32_t n) | |
d5a16761 JT |
1898 | { |
1899 | const unsigned char *index = p->index_data; | |
37fec86a | 1900 | const unsigned int hashsz = the_hash_algo->rawsz; |
d5a16761 JT |
1901 | if (!index) { |
1902 | if (open_pack_index(p)) | |
2fecc48c | 1903 | return -1; |
d5a16761 JT |
1904 | index = p->index_data; |
1905 | } | |
1906 | if (n >= p->num_objects) | |
2fecc48c | 1907 | return -1; |
d5a16761 JT |
1908 | index += 4 * 256; |
1909 | if (p->index_version == 1) { | |
2fecc48c | 1910 | oidread(oid, index + (hashsz + 4) * n + 4); |
d5a16761 JT |
1911 | } else { |
1912 | index += 8; | |
2fecc48c | 1913 | oidread(oid, index + hashsz * n); |
d5a16761 | 1914 | } |
0763671b | 1915 | return 0; |
d5a16761 | 1916 | } |
9e0f45f5 JT |
1917 | |
1918 | void check_pack_index_ptr(const struct packed_git *p, const void *vptr) | |
1919 | { | |
1920 | const unsigned char *ptr = vptr; | |
1921 | const unsigned char *start = p->index_data; | |
1922 | const unsigned char *end = start + p->index_size; | |
1923 | if (ptr < start) | |
1924 | die(_("offset before start of pack index for %s (corrupt index?)"), | |
1925 | p->pack_name); | |
1926 | /* No need to check for underflow; .idx files must be at least 8 bytes */ | |
1927 | if (ptr >= end - 8) | |
1928 | die(_("offset beyond end of pack index for %s (truncated index?)"), | |
1929 | p->pack_name); | |
1930 | } | |
1931 | ||
1932 | off_t nth_packed_object_offset(const struct packed_git *p, uint32_t n) | |
1933 | { | |
1934 | const unsigned char *index = p->index_data; | |
37fec86a | 1935 | const unsigned int hashsz = the_hash_algo->rawsz; |
9e0f45f5 JT |
1936 | index += 4 * 256; |
1937 | if (p->index_version == 1) { | |
f86f7695 | 1938 | return ntohl(*((uint32_t *)(index + (hashsz + 4) * (size_t)n))); |
9e0f45f5 JT |
1939 | } else { |
1940 | uint32_t off; | |
f86f7695 | 1941 | index += 8 + (size_t)p->num_objects * (hashsz + 4); |
9e0f45f5 JT |
1942 | off = ntohl(*((uint32_t *)(index + 4 * n))); |
1943 | if (!(off & 0x80000000)) | |
1944 | return off; | |
f86f7695 | 1945 | index += (size_t)p->num_objects * 4 + (off & 0x7fffffff) * 8; |
9e0f45f5 | 1946 | check_pack_index_ptr(p, index); |
ad622a25 | 1947 | return get_be64(index); |
9e0f45f5 JT |
1948 | } |
1949 | } | |
a2551953 JT |
1950 | |
1951 | off_t find_pack_entry_one(const unsigned char *sha1, | |
1952 | struct packed_git *p) | |
1953 | { | |
a2551953 | 1954 | const unsigned char *index = p->index_data; |
3d475f46 | 1955 | struct object_id oid; |
b4e00f73 | 1956 | uint32_t result; |
a2551953 JT |
1957 | |
1958 | if (!index) { | |
1959 | if (open_pack_index(p)) | |
1960 | return 0; | |
a2551953 JT |
1961 | } |
1962 | ||
3d475f46 DS |
1963 | hashcpy(oid.hash, sha1); |
1964 | if (bsearch_pack(&oid, p, &result)) | |
b4e00f73 | 1965 | return nth_packed_object_offset(p, result); |
a2551953 JT |
1966 | return 0; |
1967 | } | |
1968 | ||
1969 | int is_pack_valid(struct packed_git *p) | |
1970 | { | |
1971 | /* An already open pack is known to be valid. */ | |
1972 | if (p->pack_fd != -1) | |
1973 | return 1; | |
1974 | ||
1975 | /* If the pack has one window completely covering the | |
1976 | * file size, the pack is known to be valid even if | |
1977 | * the descriptor is not currently open. | |
1978 | */ | |
1979 | if (p->windows) { | |
1980 | struct pack_window *w = p->windows; | |
1981 | ||
1982 | if (!w->offset && w->len == p->pack_size) | |
1983 | return 1; | |
1984 | } | |
1985 | ||
1986 | /* Force the pack to open to prove its valid. */ | |
1987 | return !open_packed_git(p); | |
1988 | } | |
d6fe0036 JT |
1989 | |
1990 | struct packed_git *find_sha1_pack(const unsigned char *sha1, | |
1991 | struct packed_git *packs) | |
1992 | { | |
1993 | struct packed_git *p; | |
1994 | ||
1995 | for (p = packs; p; p = p->next) { | |
1996 | if (find_pack_entry_one(sha1, p)) | |
1997 | return p; | |
1998 | } | |
1999 | return NULL; | |
2000 | ||
2001 | } | |
1a1e5d4f | 2002 | |
544443cb | 2003 | static int fill_pack_entry(const struct object_id *oid, |
1a1e5d4f JT |
2004 | struct pack_entry *e, |
2005 | struct packed_git *p) | |
2006 | { | |
2007 | off_t offset; | |
2008 | ||
09ef6617 RS |
2009 | if (oidset_size(&p->bad_objects) && |
2010 | oidset_contains(&p->bad_objects, oid)) | |
2011 | return 0; | |
1a1e5d4f | 2012 | |
544443cb | 2013 | offset = find_pack_entry_one(oid->hash, p); |
1a1e5d4f JT |
2014 | if (!offset) |
2015 | return 0; | |
2016 | ||
2017 | /* | |
2018 | * We are about to tell the caller where they can locate the | |
2019 | * requested object. We better make sure the packfile is | |
2020 | * still here and can be accessed before supplying that | |
2021 | * answer, as it may have been deleted since the index was | |
2022 | * loaded! | |
2023 | */ | |
2024 | if (!is_pack_valid(p)) | |
2025 | return 0; | |
2026 | e->offset = offset; | |
2027 | e->p = p; | |
1a1e5d4f JT |
2028 | return 1; |
2029 | } | |
2030 | ||
544443cb | 2031 | int find_pack_entry(struct repository *r, const struct object_id *oid, struct pack_entry *e) |
1a1e5d4f | 2032 | { |
8865859d | 2033 | struct list_head *pos; |
3715a633 | 2034 | struct multi_pack_index *m; |
1a1e5d4f | 2035 | |
0a0dd632 | 2036 | prepare_packed_git(r); |
3715a633 | 2037 | if (!r->objects->packed_git && !r->objects->multi_pack_index) |
1a1e5d4f JT |
2038 | return 0; |
2039 | ||
3715a633 | 2040 | for (m = r->objects->multi_pack_index; m; m = m->next) { |
64404a24 | 2041 | if (fill_midx_entry(r, oid, e, m)) |
3715a633 DS |
2042 | return 1; |
2043 | } | |
2044 | ||
0a0dd632 | 2045 | list_for_each(pos, &r->objects->packed_git_mru) { |
ec2dd32c | 2046 | struct packed_git *p = list_entry(pos, struct packed_git, mru); |
af96fe33 | 2047 | if (!p->multi_pack_index && fill_pack_entry(oid, e, p)) { |
0a0dd632 | 2048 | list_move(&p->mru, &r->objects->packed_git_mru); |
1a1e5d4f JT |
2049 | return 1; |
2050 | } | |
2051 | } | |
2052 | return 0; | |
2053 | } | |
150e3001 | 2054 | |
20b031fe JK |
2055 | static void maybe_invalidate_kept_pack_cache(struct repository *r, |
2056 | unsigned flags) | |
2057 | { | |
2058 | if (!r->objects->kept_pack_cache.packs) | |
2059 | return; | |
2060 | if (r->objects->kept_pack_cache.flags == flags) | |
2061 | return; | |
2062 | FREE_AND_NULL(r->objects->kept_pack_cache.packs); | |
2063 | r->objects->kept_pack_cache.flags = 0; | |
2064 | } | |
2065 | ||
2066 | static struct packed_git **kept_pack_cache(struct repository *r, unsigned flags) | |
f62312e0 | 2067 | { |
20b031fe JK |
2068 | maybe_invalidate_kept_pack_cache(r, flags); |
2069 | ||
2070 | if (!r->objects->kept_pack_cache.packs) { | |
2071 | struct packed_git **packs = NULL; | |
2072 | size_t nr = 0, alloc = 0; | |
2073 | struct packed_git *p; | |
2074 | ||
2075 | /* | |
2076 | * We want "all" packs here, because we need to cover ones that | |
2077 | * are used by a midx, as well. We need to look in every one of | |
2078 | * them (instead of the midx itself) to cover duplicates. It's | |
2079 | * possible that an object is found in two packs that the midx | |
2080 | * covers, one kept and one not kept, but the midx returns only | |
2081 | * the non-kept version. | |
2082 | */ | |
2083 | for (p = get_all_packs(r); p; p = p->next) { | |
2084 | if ((p->pack_keep && (flags & ON_DISK_KEEP_PACKS)) || | |
2085 | (p->pack_keep_in_core && (flags & IN_CORE_KEEP_PACKS))) { | |
2086 | ALLOC_GROW(packs, nr + 1, alloc); | |
2087 | packs[nr++] = p; | |
2088 | } | |
2089 | } | |
2090 | ALLOC_GROW(packs, nr + 1, alloc); | |
2091 | packs[nr] = NULL; | |
2092 | ||
2093 | r->objects->kept_pack_cache.packs = packs; | |
2094 | r->objects->kept_pack_cache.flags = flags; | |
2095 | } | |
2096 | ||
2097 | return r->objects->kept_pack_cache.packs; | |
f62312e0 TB |
2098 | } |
2099 | ||
2100 | int find_kept_pack_entry(struct repository *r, | |
2101 | const struct object_id *oid, | |
2102 | unsigned flags, | |
2103 | struct pack_entry *e) | |
2104 | { | |
20b031fe JK |
2105 | struct packed_git **cache; |
2106 | ||
2107 | for (cache = kept_pack_cache(r, flags); *cache; cache++) { | |
2108 | struct packed_git *p = *cache; | |
2109 | if (fill_pack_entry(oid, e, p)) | |
2110 | return 1; | |
2111 | } | |
2112 | ||
2113 | return 0; | |
f62312e0 TB |
2114 | } |
2115 | ||
14c3c80c | 2116 | int has_object_pack(const struct object_id *oid) |
150e3001 JT |
2117 | { |
2118 | struct pack_entry e; | |
544443cb | 2119 | return find_pack_entry(the_repository, oid, &e); |
150e3001 | 2120 | } |
f9a8672a | 2121 | |
f62312e0 TB |
2122 | int has_object_kept_pack(const struct object_id *oid, unsigned flags) |
2123 | { | |
2124 | struct pack_entry e; | |
2125 | return find_kept_pack_entry(the_repository, oid, flags, &e); | |
2126 | } | |
2127 | ||
f9a8672a JT |
2128 | int has_pack_index(const unsigned char *sha1) |
2129 | { | |
2130 | struct stat st; | |
2131 | if (stat(sha1_pack_index_name(sha1), &st)) | |
2132 | return 0; | |
2133 | return 1; | |
2134 | } | |
7709f468 | 2135 | |
736eb88f JK |
2136 | int for_each_object_in_pack(struct packed_git *p, |
2137 | each_packed_object_fn cb, void *data, | |
2138 | enum for_each_object_flags flags) | |
7709f468 JT |
2139 | { |
2140 | uint32_t i; | |
2141 | int r = 0; | |
2142 | ||
4828ce98 JK |
2143 | if (flags & FOR_EACH_OBJECT_PACK_ORDER) { |
2144 | if (load_pack_revindex(p)) | |
2145 | return -1; | |
2146 | } | |
736eb88f | 2147 | |
7709f468 | 2148 | for (i = 0; i < p->num_objects; i++) { |
779412b9 | 2149 | uint32_t index_pos; |
7709f468 JT |
2150 | struct object_id oid; |
2151 | ||
779412b9 JK |
2152 | /* |
2153 | * We are iterating "i" from 0 up to num_objects, but its | |
2154 | * meaning may be different, depending on the requested output | |
2155 | * order: | |
2156 | * | |
2157 | * - in object-name order, it is the same as the index order | |
2158 | * used by nth_packed_object_id(), so we can pass it | |
2159 | * directly | |
2160 | * | |
2161 | * - in pack-order, it is pack position, which we must | |
2162 | * convert to an index position in order to get the oid. | |
2163 | */ | |
736eb88f | 2164 | if (flags & FOR_EACH_OBJECT_PACK_ORDER) |
779412b9 | 2165 | index_pos = pack_pos_to_index(p, i); |
736eb88f | 2166 | else |
779412b9 | 2167 | index_pos = i; |
736eb88f | 2168 | |
779412b9 | 2169 | if (nth_packed_object_id(&oid, p, index_pos) < 0) |
7709f468 | 2170 | return error("unable to get sha1 of object %u in %s", |
779412b9 | 2171 | index_pos, p->pack_name); |
7709f468 | 2172 | |
779412b9 | 2173 | r = cb(&oid, p, index_pos, data); |
7709f468 JT |
2174 | if (r) |
2175 | break; | |
2176 | } | |
2177 | return r; | |
2178 | } | |
2179 | ||
a7ff6f5a JK |
2180 | int for_each_packed_object(each_packed_object_fn cb, void *data, |
2181 | enum for_each_object_flags flags) | |
7709f468 JT |
2182 | { |
2183 | struct packed_git *p; | |
2184 | int r = 0; | |
2185 | int pack_errors = 0; | |
2186 | ||
6fdb4e9f | 2187 | prepare_packed_git(the_repository); |
454ea2e4 | 2188 | for (p = get_all_packs(the_repository); p; p = p->next) { |
7709f468 JT |
2189 | if ((flags & FOR_EACH_OBJECT_LOCAL_ONLY) && !p->pack_local) |
2190 | continue; | |
498f1f61 JT |
2191 | if ((flags & FOR_EACH_OBJECT_PROMISOR_ONLY) && |
2192 | !p->pack_promisor) | |
2193 | continue; | |
a241878a TB |
2194 | if ((flags & FOR_EACH_OBJECT_SKIP_IN_CORE_KEPT_PACKS) && |
2195 | p->pack_keep_in_core) | |
2196 | continue; | |
2197 | if ((flags & FOR_EACH_OBJECT_SKIP_ON_DISK_KEPT_PACKS) && | |
2198 | p->pack_keep) | |
2199 | continue; | |
7709f468 JT |
2200 | if (open_pack_index(p)) { |
2201 | pack_errors = 1; | |
2202 | continue; | |
2203 | } | |
736eb88f | 2204 | r = for_each_object_in_pack(p, cb, data, flags); |
7709f468 JT |
2205 | if (r) |
2206 | break; | |
2207 | } | |
2208 | return r ? r : pack_errors; | |
2209 | } | |
498f1f61 JT |
2210 | |
2211 | static int add_promisor_object(const struct object_id *oid, | |
2212 | struct packed_git *pack, | |
2213 | uint32_t pos, | |
2214 | void *set_) | |
2215 | { | |
2216 | struct oidset *set = set_; | |
109cd76d | 2217 | struct object *obj = parse_object(the_repository, oid); |
498f1f61 JT |
2218 | if (!obj) |
2219 | return 1; | |
2220 | ||
2221 | oidset_insert(set, oid); | |
2222 | ||
2223 | /* | |
2224 | * If this is a tree, commit, or tag, the objects it refers | |
a80d72db | 2225 | * to are also promisor objects. (Blobs refer to no objects->) |
498f1f61 JT |
2226 | */ |
2227 | if (obj->type == OBJ_TREE) { | |
2228 | struct tree *tree = (struct tree *)obj; | |
2229 | struct tree_desc desc; | |
2230 | struct name_entry entry; | |
2231 | if (init_tree_desc_gently(&desc, tree->buffer, tree->size)) | |
2232 | /* | |
2233 | * Error messages are given when packs are | |
2234 | * verified, so do not print any here. | |
2235 | */ | |
2236 | return 0; | |
2237 | while (tree_entry_gently(&desc, &entry)) | |
ea82b2a0 | 2238 | oidset_insert(set, &entry.oid); |
fcc07e98 | 2239 | free_tree_buffer(tree); |
498f1f61 JT |
2240 | } else if (obj->type == OBJ_COMMIT) { |
2241 | struct commit *commit = (struct commit *) obj; | |
2242 | struct commit_list *parents = commit->parents; | |
2243 | ||
2e27bd77 | 2244 | oidset_insert(set, get_commit_tree_oid(commit)); |
498f1f61 JT |
2245 | for (; parents; parents = parents->next) |
2246 | oidset_insert(set, &parents->item->object.oid); | |
2247 | } else if (obj->type == OBJ_TAG) { | |
2248 | struct tag *tag = (struct tag *) obj; | |
c77722b3 | 2249 | oidset_insert(set, get_tagged_oid(tag)); |
498f1f61 JT |
2250 | } |
2251 | return 0; | |
2252 | } | |
2253 | ||
2254 | int is_promisor_object(const struct object_id *oid) | |
2255 | { | |
2256 | static struct oidset promisor_objects; | |
2257 | static int promisor_objects_prepared; | |
2258 | ||
2259 | if (!promisor_objects_prepared) { | |
b14ed5ad | 2260 | if (has_promisor_remote()) { |
498f1f61 JT |
2261 | for_each_packed_object(add_promisor_object, |
2262 | &promisor_objects, | |
2263 | FOR_EACH_OBJECT_PROMISOR_ONLY); | |
2264 | } | |
2265 | promisor_objects_prepared = 1; | |
2266 | } | |
2267 | return oidset_contains(&promisor_objects, oid); | |
2268 | } |