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08fd81c9 DS |
1 | #include "cache.h" |
2 | #include "config.h" | |
3 | #include "git-compat-util.h" | |
4 | #include "lockfile.h" | |
5 | #include "pack.h" | |
6 | #include "packfile.h" | |
7 | #include "commit.h" | |
8 | #include "object.h" | |
9 | #include "revision.h" | |
10 | #include "sha1-lookup.h" | |
11 | #include "commit-graph.h" | |
b10edb2d | 12 | #include "object-store.h" |
08fd81c9 DS |
13 | |
14 | #define GRAPH_SIGNATURE 0x43475048 /* "CGPH" */ | |
15 | #define GRAPH_CHUNKID_OIDFANOUT 0x4f494446 /* "OIDF" */ | |
16 | #define GRAPH_CHUNKID_OIDLOOKUP 0x4f49444c /* "OIDL" */ | |
17 | #define GRAPH_CHUNKID_DATA 0x43444154 /* "CDAT" */ | |
18 | #define GRAPH_CHUNKID_LARGEEDGES 0x45444745 /* "EDGE" */ | |
19 | ||
20 | #define GRAPH_DATA_WIDTH 36 | |
21 | ||
22 | #define GRAPH_VERSION_1 0x1 | |
23 | #define GRAPH_VERSION GRAPH_VERSION_1 | |
24 | ||
25 | #define GRAPH_OID_VERSION_SHA1 1 | |
26 | #define GRAPH_OID_LEN_SHA1 GIT_SHA1_RAWSZ | |
27 | #define GRAPH_OID_VERSION GRAPH_OID_VERSION_SHA1 | |
28 | #define GRAPH_OID_LEN GRAPH_OID_LEN_SHA1 | |
29 | ||
30 | #define GRAPH_OCTOPUS_EDGES_NEEDED 0x80000000 | |
31 | #define GRAPH_PARENT_MISSING 0x7fffffff | |
32 | #define GRAPH_EDGE_LAST_MASK 0x7fffffff | |
33 | #define GRAPH_PARENT_NONE 0x70000000 | |
34 | ||
35 | #define GRAPH_LAST_EDGE 0x80000000 | |
36 | ||
37 | #define GRAPH_FANOUT_SIZE (4 * 256) | |
38 | #define GRAPH_CHUNKLOOKUP_WIDTH 12 | |
39 | #define GRAPH_MIN_SIZE (5 * GRAPH_CHUNKLOOKUP_WIDTH + GRAPH_FANOUT_SIZE + \ | |
40 | GRAPH_OID_LEN + 8) | |
41 | ||
2a2e32bd | 42 | char *get_commit_graph_filename(const char *obj_dir) |
08fd81c9 DS |
43 | { |
44 | return xstrfmt("%s/info/commit-graph", obj_dir); | |
45 | } | |
46 | ||
2a2e32bd DS |
47 | static struct commit_graph *alloc_commit_graph(void) |
48 | { | |
49 | struct commit_graph *g = xcalloc(1, sizeof(*g)); | |
50 | g->graph_fd = -1; | |
51 | ||
52 | return g; | |
53 | } | |
54 | ||
55 | struct commit_graph *load_commit_graph_one(const char *graph_file) | |
56 | { | |
57 | void *graph_map; | |
58 | const unsigned char *data, *chunk_lookup; | |
59 | size_t graph_size; | |
60 | struct stat st; | |
61 | uint32_t i; | |
62 | struct commit_graph *graph; | |
63 | int fd = git_open(graph_file); | |
64 | uint64_t last_chunk_offset; | |
65 | uint32_t last_chunk_id; | |
66 | uint32_t graph_signature; | |
67 | unsigned char graph_version, hash_version; | |
68 | ||
69 | if (fd < 0) | |
70 | return NULL; | |
71 | if (fstat(fd, &st)) { | |
72 | close(fd); | |
73 | return NULL; | |
74 | } | |
75 | graph_size = xsize_t(st.st_size); | |
76 | ||
77 | if (graph_size < GRAPH_MIN_SIZE) { | |
78 | close(fd); | |
79 | die("graph file %s is too small", graph_file); | |
80 | } | |
81 | graph_map = xmmap(NULL, graph_size, PROT_READ, MAP_PRIVATE, fd, 0); | |
82 | data = (const unsigned char *)graph_map; | |
83 | ||
84 | graph_signature = get_be32(data); | |
85 | if (graph_signature != GRAPH_SIGNATURE) { | |
86 | error("graph signature %X does not match signature %X", | |
87 | graph_signature, GRAPH_SIGNATURE); | |
88 | goto cleanup_fail; | |
89 | } | |
90 | ||
91 | graph_version = *(unsigned char*)(data + 4); | |
92 | if (graph_version != GRAPH_VERSION) { | |
93 | error("graph version %X does not match version %X", | |
94 | graph_version, GRAPH_VERSION); | |
95 | goto cleanup_fail; | |
96 | } | |
97 | ||
98 | hash_version = *(unsigned char*)(data + 5); | |
99 | if (hash_version != GRAPH_OID_VERSION) { | |
100 | error("hash version %X does not match version %X", | |
101 | hash_version, GRAPH_OID_VERSION); | |
102 | goto cleanup_fail; | |
103 | } | |
104 | ||
105 | graph = alloc_commit_graph(); | |
106 | ||
107 | graph->hash_len = GRAPH_OID_LEN; | |
108 | graph->num_chunks = *(unsigned char*)(data + 6); | |
109 | graph->graph_fd = fd; | |
110 | graph->data = graph_map; | |
111 | graph->data_len = graph_size; | |
112 | ||
113 | last_chunk_id = 0; | |
114 | last_chunk_offset = 8; | |
115 | chunk_lookup = data + 8; | |
116 | for (i = 0; i < graph->num_chunks; i++) { | |
117 | uint32_t chunk_id = get_be32(chunk_lookup + 0); | |
118 | uint64_t chunk_offset = get_be64(chunk_lookup + 4); | |
119 | int chunk_repeated = 0; | |
120 | ||
121 | chunk_lookup += GRAPH_CHUNKLOOKUP_WIDTH; | |
122 | ||
123 | if (chunk_offset > graph_size - GIT_MAX_RAWSZ) { | |
124 | error("improper chunk offset %08x%08x", (uint32_t)(chunk_offset >> 32), | |
125 | (uint32_t)chunk_offset); | |
126 | goto cleanup_fail; | |
127 | } | |
128 | ||
129 | switch (chunk_id) { | |
130 | case GRAPH_CHUNKID_OIDFANOUT: | |
131 | if (graph->chunk_oid_fanout) | |
132 | chunk_repeated = 1; | |
133 | else | |
134 | graph->chunk_oid_fanout = (uint32_t*)(data + chunk_offset); | |
135 | break; | |
136 | ||
137 | case GRAPH_CHUNKID_OIDLOOKUP: | |
138 | if (graph->chunk_oid_lookup) | |
139 | chunk_repeated = 1; | |
140 | else | |
141 | graph->chunk_oid_lookup = data + chunk_offset; | |
142 | break; | |
143 | ||
144 | case GRAPH_CHUNKID_DATA: | |
145 | if (graph->chunk_commit_data) | |
146 | chunk_repeated = 1; | |
147 | else | |
148 | graph->chunk_commit_data = data + chunk_offset; | |
149 | break; | |
150 | ||
151 | case GRAPH_CHUNKID_LARGEEDGES: | |
152 | if (graph->chunk_large_edges) | |
153 | chunk_repeated = 1; | |
154 | else | |
155 | graph->chunk_large_edges = data + chunk_offset; | |
156 | break; | |
157 | } | |
158 | ||
159 | if (chunk_repeated) { | |
160 | error("chunk id %08x appears multiple times", chunk_id); | |
161 | goto cleanup_fail; | |
162 | } | |
163 | ||
164 | if (last_chunk_id == GRAPH_CHUNKID_OIDLOOKUP) | |
165 | { | |
166 | graph->num_commits = (chunk_offset - last_chunk_offset) | |
167 | / graph->hash_len; | |
168 | } | |
169 | ||
170 | last_chunk_id = chunk_id; | |
171 | last_chunk_offset = chunk_offset; | |
172 | } | |
173 | ||
174 | return graph; | |
175 | ||
176 | cleanup_fail: | |
177 | munmap(graph_map, graph_size); | |
178 | close(fd); | |
179 | exit(1); | |
180 | } | |
181 | ||
177722b3 DS |
182 | /* global storage */ |
183 | static struct commit_graph *commit_graph = NULL; | |
184 | ||
185 | static void prepare_commit_graph_one(const char *obj_dir) | |
186 | { | |
187 | char *graph_name; | |
188 | ||
189 | if (commit_graph) | |
190 | return; | |
191 | ||
192 | graph_name = get_commit_graph_filename(obj_dir); | |
193 | commit_graph = load_commit_graph_one(graph_name); | |
194 | ||
195 | FREE_AND_NULL(graph_name); | |
196 | } | |
197 | ||
198 | static int prepare_commit_graph_run_once = 0; | |
199 | static void prepare_commit_graph(void) | |
200 | { | |
201 | struct alternate_object_database *alt; | |
202 | char *obj_dir; | |
203 | ||
204 | if (prepare_commit_graph_run_once) | |
205 | return; | |
206 | prepare_commit_graph_run_once = 1; | |
207 | ||
208 | obj_dir = get_object_directory(); | |
209 | prepare_commit_graph_one(obj_dir); | |
b10edb2d JH |
210 | prepare_alt_odb(the_repository); |
211 | for (alt = the_repository->objects->alt_odb_list; | |
212 | !commit_graph && alt; | |
213 | alt = alt->next) | |
177722b3 DS |
214 | prepare_commit_graph_one(alt->path); |
215 | } | |
216 | ||
217 | static void close_commit_graph(void) | |
218 | { | |
219 | if (!commit_graph) | |
220 | return; | |
221 | ||
222 | if (commit_graph->graph_fd >= 0) { | |
223 | munmap((void *)commit_graph->data, commit_graph->data_len); | |
224 | commit_graph->data = NULL; | |
225 | close(commit_graph->graph_fd); | |
226 | } | |
227 | ||
228 | FREE_AND_NULL(commit_graph); | |
229 | } | |
230 | ||
231 | static int bsearch_graph(struct commit_graph *g, struct object_id *oid, uint32_t *pos) | |
232 | { | |
233 | return bsearch_hash(oid->hash, g->chunk_oid_fanout, | |
234 | g->chunk_oid_lookup, g->hash_len, pos); | |
235 | } | |
236 | ||
237 | static struct commit_list **insert_parent_or_die(struct commit_graph *g, | |
238 | uint64_t pos, | |
239 | struct commit_list **pptr) | |
240 | { | |
241 | struct commit *c; | |
242 | struct object_id oid; | |
243 | hashcpy(oid.hash, g->chunk_oid_lookup + g->hash_len * pos); | |
244 | c = lookup_commit(&oid); | |
245 | if (!c) | |
246 | die("could not find commit %s", oid_to_hex(&oid)); | |
247 | c->graph_pos = pos; | |
248 | return &commit_list_insert(c, pptr)->next; | |
249 | } | |
250 | ||
251 | static int fill_commit_in_graph(struct commit *item, struct commit_graph *g, uint32_t pos) | |
252 | { | |
177722b3 DS |
253 | uint32_t edge_value; |
254 | uint32_t *parent_data_ptr; | |
255 | uint64_t date_low, date_high; | |
256 | struct commit_list **pptr; | |
257 | const unsigned char *commit_data = g->chunk_commit_data + (g->hash_len + 16) * pos; | |
258 | ||
259 | item->object.parsed = 1; | |
260 | item->graph_pos = pos; | |
261 | ||
7b8a21db | 262 | item->maybe_tree = NULL; |
177722b3 DS |
263 | |
264 | date_high = get_be32(commit_data + g->hash_len + 8) & 0x3; | |
265 | date_low = get_be32(commit_data + g->hash_len + 12); | |
266 | item->date = (timestamp_t)((date_high << 32) | date_low); | |
267 | ||
268 | pptr = &item->parents; | |
269 | ||
270 | edge_value = get_be32(commit_data + g->hash_len); | |
271 | if (edge_value == GRAPH_PARENT_NONE) | |
272 | return 1; | |
273 | pptr = insert_parent_or_die(g, edge_value, pptr); | |
274 | ||
275 | edge_value = get_be32(commit_data + g->hash_len + 4); | |
276 | if (edge_value == GRAPH_PARENT_NONE) | |
277 | return 1; | |
278 | if (!(edge_value & GRAPH_OCTOPUS_EDGES_NEEDED)) { | |
279 | pptr = insert_parent_or_die(g, edge_value, pptr); | |
280 | return 1; | |
281 | } | |
282 | ||
283 | parent_data_ptr = (uint32_t*)(g->chunk_large_edges + | |
284 | 4 * (uint64_t)(edge_value & GRAPH_EDGE_LAST_MASK)); | |
285 | do { | |
286 | edge_value = get_be32(parent_data_ptr); | |
287 | pptr = insert_parent_or_die(g, | |
288 | edge_value & GRAPH_EDGE_LAST_MASK, | |
289 | pptr); | |
290 | parent_data_ptr++; | |
291 | } while (!(edge_value & GRAPH_LAST_EDGE)); | |
292 | ||
293 | return 1; | |
294 | } | |
295 | ||
296 | int parse_commit_in_graph(struct commit *item) | |
297 | { | |
298 | if (!core_commit_graph) | |
299 | return 0; | |
300 | if (item->object.parsed) | |
301 | return 1; | |
302 | ||
303 | prepare_commit_graph(); | |
304 | if (commit_graph) { | |
305 | uint32_t pos; | |
306 | int found; | |
307 | if (item->graph_pos != COMMIT_NOT_FROM_GRAPH) { | |
308 | pos = item->graph_pos; | |
309 | found = 1; | |
310 | } else { | |
311 | found = bsearch_graph(commit_graph, &(item->object.oid), &pos); | |
312 | } | |
313 | ||
314 | if (found) | |
315 | return fill_commit_in_graph(item, commit_graph, pos); | |
316 | } | |
317 | ||
318 | return 0; | |
319 | } | |
320 | ||
7b8a21db DS |
321 | static struct tree *load_tree_for_commit(struct commit_graph *g, struct commit *c) |
322 | { | |
323 | struct object_id oid; | |
324 | const unsigned char *commit_data = g->chunk_commit_data + | |
325 | GRAPH_DATA_WIDTH * (c->graph_pos); | |
326 | ||
327 | hashcpy(oid.hash, commit_data); | |
328 | c->maybe_tree = lookup_tree(&oid); | |
329 | ||
330 | return c->maybe_tree; | |
331 | } | |
332 | ||
333 | struct tree *get_commit_tree_in_graph(const struct commit *c) | |
334 | { | |
335 | if (c->maybe_tree) | |
336 | return c->maybe_tree; | |
337 | if (c->graph_pos == COMMIT_NOT_FROM_GRAPH) | |
338 | BUG("get_commit_tree_in_graph called from non-commit-graph commit"); | |
339 | ||
340 | return load_tree_for_commit(commit_graph, (struct commit *)c); | |
341 | } | |
342 | ||
08fd81c9 DS |
343 | static void write_graph_chunk_fanout(struct hashfile *f, |
344 | struct commit **commits, | |
345 | int nr_commits) | |
346 | { | |
347 | int i, count = 0; | |
348 | struct commit **list = commits; | |
349 | ||
350 | /* | |
351 | * Write the first-level table (the list is sorted, | |
352 | * but we use a 256-entry lookup to be able to avoid | |
353 | * having to do eight extra binary search iterations). | |
354 | */ | |
355 | for (i = 0; i < 256; i++) { | |
356 | while (count < nr_commits) { | |
357 | if ((*list)->object.oid.hash[0] != i) | |
358 | break; | |
359 | count++; | |
360 | list++; | |
361 | } | |
362 | ||
363 | hashwrite_be32(f, count); | |
364 | } | |
365 | } | |
366 | ||
367 | static void write_graph_chunk_oids(struct hashfile *f, int hash_len, | |
368 | struct commit **commits, int nr_commits) | |
369 | { | |
370 | struct commit **list = commits; | |
371 | int count; | |
372 | for (count = 0; count < nr_commits; count++, list++) | |
373 | hashwrite(f, (*list)->object.oid.hash, (int)hash_len); | |
374 | } | |
375 | ||
376 | static const unsigned char *commit_to_sha1(size_t index, void *table) | |
377 | { | |
378 | struct commit **commits = table; | |
379 | return commits[index]->object.oid.hash; | |
380 | } | |
381 | ||
382 | static void write_graph_chunk_data(struct hashfile *f, int hash_len, | |
383 | struct commit **commits, int nr_commits) | |
384 | { | |
385 | struct commit **list = commits; | |
386 | struct commit **last = commits + nr_commits; | |
387 | uint32_t num_extra_edges = 0; | |
388 | ||
389 | while (list < last) { | |
390 | struct commit_list *parent; | |
391 | int edge_value; | |
392 | uint32_t packedDate[2]; | |
393 | ||
394 | parse_commit(*list); | |
2e27bd77 | 395 | hashwrite(f, get_commit_tree_oid(*list)->hash, hash_len); |
08fd81c9 DS |
396 | |
397 | parent = (*list)->parents; | |
398 | ||
399 | if (!parent) | |
400 | edge_value = GRAPH_PARENT_NONE; | |
401 | else { | |
402 | edge_value = sha1_pos(parent->item->object.oid.hash, | |
403 | commits, | |
404 | nr_commits, | |
405 | commit_to_sha1); | |
406 | ||
407 | if (edge_value < 0) | |
408 | edge_value = GRAPH_PARENT_MISSING; | |
409 | } | |
410 | ||
411 | hashwrite_be32(f, edge_value); | |
412 | ||
413 | if (parent) | |
414 | parent = parent->next; | |
415 | ||
416 | if (!parent) | |
417 | edge_value = GRAPH_PARENT_NONE; | |
418 | else if (parent->next) | |
419 | edge_value = GRAPH_OCTOPUS_EDGES_NEEDED | num_extra_edges; | |
420 | else { | |
421 | edge_value = sha1_pos(parent->item->object.oid.hash, | |
422 | commits, | |
423 | nr_commits, | |
424 | commit_to_sha1); | |
425 | if (edge_value < 0) | |
426 | edge_value = GRAPH_PARENT_MISSING; | |
427 | } | |
428 | ||
429 | hashwrite_be32(f, edge_value); | |
430 | ||
431 | if (edge_value & GRAPH_OCTOPUS_EDGES_NEEDED) { | |
432 | do { | |
433 | num_extra_edges++; | |
434 | parent = parent->next; | |
435 | } while (parent); | |
436 | } | |
437 | ||
438 | if (sizeof((*list)->date) > 4) | |
439 | packedDate[0] = htonl(((*list)->date >> 32) & 0x3); | |
440 | else | |
441 | packedDate[0] = 0; | |
442 | ||
443 | packedDate[1] = htonl((*list)->date); | |
444 | hashwrite(f, packedDate, 8); | |
445 | ||
446 | list++; | |
447 | } | |
448 | } | |
449 | ||
450 | static void write_graph_chunk_large_edges(struct hashfile *f, | |
451 | struct commit **commits, | |
452 | int nr_commits) | |
453 | { | |
454 | struct commit **list = commits; | |
455 | struct commit **last = commits + nr_commits; | |
456 | struct commit_list *parent; | |
457 | ||
458 | while (list < last) { | |
459 | int num_parents = 0; | |
460 | for (parent = (*list)->parents; num_parents < 3 && parent; | |
461 | parent = parent->next) | |
462 | num_parents++; | |
463 | ||
464 | if (num_parents <= 2) { | |
465 | list++; | |
466 | continue; | |
467 | } | |
468 | ||
469 | /* Since num_parents > 2, this initializer is safe. */ | |
470 | for (parent = (*list)->parents->next; parent; parent = parent->next) { | |
471 | int edge_value = sha1_pos(parent->item->object.oid.hash, | |
472 | commits, | |
473 | nr_commits, | |
474 | commit_to_sha1); | |
475 | ||
476 | if (edge_value < 0) | |
477 | edge_value = GRAPH_PARENT_MISSING; | |
478 | else if (!parent->next) | |
479 | edge_value |= GRAPH_LAST_EDGE; | |
480 | ||
481 | hashwrite_be32(f, edge_value); | |
482 | } | |
483 | ||
484 | list++; | |
485 | } | |
486 | } | |
487 | ||
488 | static int commit_compare(const void *_a, const void *_b) | |
489 | { | |
490 | const struct object_id *a = (const struct object_id *)_a; | |
491 | const struct object_id *b = (const struct object_id *)_b; | |
492 | return oidcmp(a, b); | |
493 | } | |
494 | ||
495 | struct packed_commit_list { | |
496 | struct commit **list; | |
497 | int nr; | |
498 | int alloc; | |
499 | }; | |
500 | ||
501 | struct packed_oid_list { | |
502 | struct object_id *list; | |
503 | int nr; | |
504 | int alloc; | |
505 | }; | |
506 | ||
507 | static int add_packed_commits(const struct object_id *oid, | |
508 | struct packed_git *pack, | |
509 | uint32_t pos, | |
510 | void *data) | |
511 | { | |
512 | struct packed_oid_list *list = (struct packed_oid_list*)data; | |
513 | enum object_type type; | |
514 | off_t offset = nth_packed_object_offset(pack, pos); | |
515 | struct object_info oi = OBJECT_INFO_INIT; | |
516 | ||
517 | oi.typep = &type; | |
fcb6df32 | 518 | if (packed_object_info(the_repository, pack, offset, &oi) < 0) |
08fd81c9 DS |
519 | die("unable to get type of object %s", oid_to_hex(oid)); |
520 | ||
521 | if (type != OBJ_COMMIT) | |
522 | return 0; | |
523 | ||
524 | ALLOC_GROW(list->list, list->nr + 1, list->alloc); | |
525 | oidcpy(&(list->list[list->nr]), oid); | |
526 | list->nr++; | |
527 | ||
528 | return 0; | |
529 | } | |
530 | ||
4f2542b4 DS |
531 | static void add_missing_parents(struct packed_oid_list *oids, struct commit *commit) |
532 | { | |
533 | struct commit_list *parent; | |
534 | for (parent = commit->parents; parent; parent = parent->next) { | |
535 | if (!(parent->item->object.flags & UNINTERESTING)) { | |
536 | ALLOC_GROW(oids->list, oids->nr + 1, oids->alloc); | |
537 | oidcpy(&oids->list[oids->nr], &(parent->item->object.oid)); | |
538 | oids->nr++; | |
539 | parent->item->object.flags |= UNINTERESTING; | |
540 | } | |
541 | } | |
542 | } | |
543 | ||
544 | static void close_reachable(struct packed_oid_list *oids) | |
545 | { | |
546 | int i; | |
547 | struct commit *commit; | |
548 | ||
549 | for (i = 0; i < oids->nr; i++) { | |
550 | commit = lookup_commit(&oids->list[i]); | |
551 | if (commit) | |
552 | commit->object.flags |= UNINTERESTING; | |
553 | } | |
554 | ||
555 | /* | |
556 | * As this loop runs, oids->nr may grow, but not more | |
557 | * than the number of missing commits in the reachable | |
558 | * closure. | |
559 | */ | |
560 | for (i = 0; i < oids->nr; i++) { | |
561 | commit = lookup_commit(&oids->list[i]); | |
562 | ||
563 | if (commit && !parse_commit(commit)) | |
564 | add_missing_parents(oids, commit); | |
565 | } | |
566 | ||
567 | for (i = 0; i < oids->nr; i++) { | |
568 | commit = lookup_commit(&oids->list[i]); | |
569 | ||
570 | if (commit) | |
571 | commit->object.flags &= ~UNINTERESTING; | |
572 | } | |
573 | } | |
574 | ||
049d51a2 DS |
575 | void write_commit_graph(const char *obj_dir, |
576 | const char **pack_indexes, | |
3d5df01b DS |
577 | int nr_packs, |
578 | const char **commit_hex, | |
7547b95b DS |
579 | int nr_commits, |
580 | int append) | |
08fd81c9 DS |
581 | { |
582 | struct packed_oid_list oids; | |
583 | struct packed_commit_list commits; | |
584 | struct hashfile *f; | |
585 | uint32_t i, count_distinct = 0; | |
586 | char *graph_name; | |
587 | int fd; | |
588 | struct lock_file lk = LOCK_INIT; | |
589 | uint32_t chunk_ids[5]; | |
590 | uint64_t chunk_offsets[5]; | |
591 | int num_chunks; | |
592 | int num_extra_edges; | |
593 | struct commit_list *parent; | |
594 | ||
595 | oids.nr = 0; | |
596 | oids.alloc = approximate_object_count() / 4; | |
597 | ||
7547b95b DS |
598 | if (append) { |
599 | prepare_commit_graph_one(obj_dir); | |
600 | if (commit_graph) | |
601 | oids.alloc += commit_graph->num_commits; | |
602 | } | |
603 | ||
08fd81c9 DS |
604 | if (oids.alloc < 1024) |
605 | oids.alloc = 1024; | |
606 | ALLOC_ARRAY(oids.list, oids.alloc); | |
607 | ||
7547b95b DS |
608 | if (append && commit_graph) { |
609 | for (i = 0; i < commit_graph->num_commits; i++) { | |
610 | const unsigned char *hash = commit_graph->chunk_oid_lookup + | |
611 | commit_graph->hash_len * i; | |
612 | hashcpy(oids.list[oids.nr++].hash, hash); | |
613 | } | |
614 | } | |
615 | ||
049d51a2 DS |
616 | if (pack_indexes) { |
617 | struct strbuf packname = STRBUF_INIT; | |
618 | int dirlen; | |
619 | strbuf_addf(&packname, "%s/pack/", obj_dir); | |
620 | dirlen = packname.len; | |
621 | for (i = 0; i < nr_packs; i++) { | |
622 | struct packed_git *p; | |
623 | strbuf_setlen(&packname, dirlen); | |
624 | strbuf_addstr(&packname, pack_indexes[i]); | |
625 | p = add_packed_git(packname.buf, packname.len, 1); | |
626 | if (!p) | |
627 | die("error adding pack %s", packname.buf); | |
628 | if (open_pack_index(p)) | |
629 | die("error opening index for %s", packname.buf); | |
630 | for_each_object_in_pack(p, add_packed_commits, &oids); | |
631 | close_pack(p); | |
632 | } | |
633 | strbuf_release(&packname); | |
3d5df01b DS |
634 | } |
635 | ||
636 | if (commit_hex) { | |
637 | for (i = 0; i < nr_commits; i++) { | |
638 | const char *end; | |
639 | struct object_id oid; | |
640 | struct commit *result; | |
641 | ||
642 | if (commit_hex[i] && parse_oid_hex(commit_hex[i], &oid, &end)) | |
643 | continue; | |
644 | ||
645 | result = lookup_commit_reference_gently(&oid, 1); | |
646 | ||
647 | if (result) { | |
648 | ALLOC_GROW(oids.list, oids.nr + 1, oids.alloc); | |
649 | oidcpy(&oids.list[oids.nr], &(result->object.oid)); | |
650 | oids.nr++; | |
651 | } | |
652 | } | |
653 | } | |
654 | ||
655 | if (!pack_indexes && !commit_hex) | |
049d51a2 DS |
656 | for_each_packed_object(add_packed_commits, &oids, 0); |
657 | ||
4f2542b4 | 658 | close_reachable(&oids); |
08fd81c9 DS |
659 | |
660 | QSORT(oids.list, oids.nr, commit_compare); | |
661 | ||
662 | count_distinct = 1; | |
663 | for (i = 1; i < oids.nr; i++) { | |
664 | if (oidcmp(&oids.list[i-1], &oids.list[i])) | |
665 | count_distinct++; | |
666 | } | |
667 | ||
668 | if (count_distinct >= GRAPH_PARENT_MISSING) | |
669 | die(_("the commit graph format cannot write %d commits"), count_distinct); | |
670 | ||
671 | commits.nr = 0; | |
672 | commits.alloc = count_distinct; | |
673 | ALLOC_ARRAY(commits.list, commits.alloc); | |
674 | ||
675 | num_extra_edges = 0; | |
676 | for (i = 0; i < oids.nr; i++) { | |
677 | int num_parents = 0; | |
678 | if (i > 0 && !oidcmp(&oids.list[i-1], &oids.list[i])) | |
679 | continue; | |
680 | ||
681 | commits.list[commits.nr] = lookup_commit(&oids.list[i]); | |
682 | parse_commit(commits.list[commits.nr]); | |
683 | ||
684 | for (parent = commits.list[commits.nr]->parents; | |
685 | parent; parent = parent->next) | |
686 | num_parents++; | |
687 | ||
688 | if (num_parents > 2) | |
689 | num_extra_edges += num_parents - 1; | |
690 | ||
691 | commits.nr++; | |
692 | } | |
693 | num_chunks = num_extra_edges ? 4 : 3; | |
694 | ||
695 | if (commits.nr >= GRAPH_PARENT_MISSING) | |
696 | die(_("too many commits to write graph")); | |
697 | ||
698 | graph_name = get_commit_graph_filename(obj_dir); | |
699 | fd = hold_lock_file_for_update(&lk, graph_name, 0); | |
700 | ||
701 | if (fd < 0) { | |
702 | struct strbuf folder = STRBUF_INIT; | |
703 | strbuf_addstr(&folder, graph_name); | |
704 | strbuf_setlen(&folder, strrchr(folder.buf, '/') - folder.buf); | |
705 | ||
706 | if (mkdir(folder.buf, 0777) < 0) | |
707 | die_errno(_("cannot mkdir %s"), folder.buf); | |
708 | strbuf_release(&folder); | |
709 | ||
710 | fd = hold_lock_file_for_update(&lk, graph_name, LOCK_DIE_ON_ERROR); | |
711 | ||
712 | if (fd < 0) | |
713 | die_errno("unable to create '%s'", graph_name); | |
714 | } | |
715 | ||
716 | f = hashfd(lk.tempfile->fd, lk.tempfile->filename.buf); | |
717 | ||
718 | hashwrite_be32(f, GRAPH_SIGNATURE); | |
719 | ||
720 | hashwrite_u8(f, GRAPH_VERSION); | |
721 | hashwrite_u8(f, GRAPH_OID_VERSION); | |
722 | hashwrite_u8(f, num_chunks); | |
723 | hashwrite_u8(f, 0); /* unused padding byte */ | |
724 | ||
725 | chunk_ids[0] = GRAPH_CHUNKID_OIDFANOUT; | |
726 | chunk_ids[1] = GRAPH_CHUNKID_OIDLOOKUP; | |
727 | chunk_ids[2] = GRAPH_CHUNKID_DATA; | |
728 | if (num_extra_edges) | |
729 | chunk_ids[3] = GRAPH_CHUNKID_LARGEEDGES; | |
730 | else | |
731 | chunk_ids[3] = 0; | |
732 | chunk_ids[4] = 0; | |
733 | ||
734 | chunk_offsets[0] = 8 + (num_chunks + 1) * GRAPH_CHUNKLOOKUP_WIDTH; | |
735 | chunk_offsets[1] = chunk_offsets[0] + GRAPH_FANOUT_SIZE; | |
736 | chunk_offsets[2] = chunk_offsets[1] + GRAPH_OID_LEN * commits.nr; | |
737 | chunk_offsets[3] = chunk_offsets[2] + (GRAPH_OID_LEN + 16) * commits.nr; | |
738 | chunk_offsets[4] = chunk_offsets[3] + 4 * num_extra_edges; | |
739 | ||
740 | for (i = 0; i <= num_chunks; i++) { | |
741 | uint32_t chunk_write[3]; | |
742 | ||
743 | chunk_write[0] = htonl(chunk_ids[i]); | |
744 | chunk_write[1] = htonl(chunk_offsets[i] >> 32); | |
745 | chunk_write[2] = htonl(chunk_offsets[i] & 0xffffffff); | |
746 | hashwrite(f, chunk_write, 12); | |
747 | } | |
748 | ||
749 | write_graph_chunk_fanout(f, commits.list, commits.nr); | |
750 | write_graph_chunk_oids(f, GRAPH_OID_LEN, commits.list, commits.nr); | |
751 | write_graph_chunk_data(f, GRAPH_OID_LEN, commits.list, commits.nr); | |
752 | write_graph_chunk_large_edges(f, commits.list, commits.nr); | |
753 | ||
177722b3 | 754 | close_commit_graph(); |
08fd81c9 DS |
755 | finalize_hashfile(f, NULL, CSUM_HASH_IN_STREAM | CSUM_FSYNC); |
756 | commit_lock_file(&lk); | |
757 | ||
758 | free(oids.list); | |
759 | oids.alloc = 0; | |
760 | oids.nr = 0; | |
761 | } |