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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" | |
12 | ||
13 | #define GRAPH_SIGNATURE 0x43475048 /* "CGPH" */ | |
14 | #define GRAPH_CHUNKID_OIDFANOUT 0x4f494446 /* "OIDF" */ | |
15 | #define GRAPH_CHUNKID_OIDLOOKUP 0x4f49444c /* "OIDL" */ | |
16 | #define GRAPH_CHUNKID_DATA 0x43444154 /* "CDAT" */ | |
17 | #define GRAPH_CHUNKID_LARGEEDGES 0x45444745 /* "EDGE" */ | |
18 | ||
19 | #define GRAPH_DATA_WIDTH 36 | |
20 | ||
21 | #define GRAPH_VERSION_1 0x1 | |
22 | #define GRAPH_VERSION GRAPH_VERSION_1 | |
23 | ||
24 | #define GRAPH_OID_VERSION_SHA1 1 | |
25 | #define GRAPH_OID_LEN_SHA1 GIT_SHA1_RAWSZ | |
26 | #define GRAPH_OID_VERSION GRAPH_OID_VERSION_SHA1 | |
27 | #define GRAPH_OID_LEN GRAPH_OID_LEN_SHA1 | |
28 | ||
29 | #define GRAPH_OCTOPUS_EDGES_NEEDED 0x80000000 | |
30 | #define GRAPH_PARENT_MISSING 0x7fffffff | |
31 | #define GRAPH_EDGE_LAST_MASK 0x7fffffff | |
32 | #define GRAPH_PARENT_NONE 0x70000000 | |
33 | ||
34 | #define GRAPH_LAST_EDGE 0x80000000 | |
35 | ||
36 | #define GRAPH_FANOUT_SIZE (4 * 256) | |
37 | #define GRAPH_CHUNKLOOKUP_WIDTH 12 | |
38 | #define GRAPH_MIN_SIZE (5 * GRAPH_CHUNKLOOKUP_WIDTH + GRAPH_FANOUT_SIZE + \ | |
39 | GRAPH_OID_LEN + 8) | |
40 | ||
2a2e32bd | 41 | char *get_commit_graph_filename(const char *obj_dir) |
08fd81c9 DS |
42 | { |
43 | return xstrfmt("%s/info/commit-graph", obj_dir); | |
44 | } | |
45 | ||
2a2e32bd DS |
46 | static struct commit_graph *alloc_commit_graph(void) |
47 | { | |
48 | struct commit_graph *g = xcalloc(1, sizeof(*g)); | |
49 | g->graph_fd = -1; | |
50 | ||
51 | return g; | |
52 | } | |
53 | ||
54 | struct commit_graph *load_commit_graph_one(const char *graph_file) | |
55 | { | |
56 | void *graph_map; | |
57 | const unsigned char *data, *chunk_lookup; | |
58 | size_t graph_size; | |
59 | struct stat st; | |
60 | uint32_t i; | |
61 | struct commit_graph *graph; | |
62 | int fd = git_open(graph_file); | |
63 | uint64_t last_chunk_offset; | |
64 | uint32_t last_chunk_id; | |
65 | uint32_t graph_signature; | |
66 | unsigned char graph_version, hash_version; | |
67 | ||
68 | if (fd < 0) | |
69 | return NULL; | |
70 | if (fstat(fd, &st)) { | |
71 | close(fd); | |
72 | return NULL; | |
73 | } | |
74 | graph_size = xsize_t(st.st_size); | |
75 | ||
76 | if (graph_size < GRAPH_MIN_SIZE) { | |
77 | close(fd); | |
78 | die("graph file %s is too small", graph_file); | |
79 | } | |
80 | graph_map = xmmap(NULL, graph_size, PROT_READ, MAP_PRIVATE, fd, 0); | |
81 | data = (const unsigned char *)graph_map; | |
82 | ||
83 | graph_signature = get_be32(data); | |
84 | if (graph_signature != GRAPH_SIGNATURE) { | |
85 | error("graph signature %X does not match signature %X", | |
86 | graph_signature, GRAPH_SIGNATURE); | |
87 | goto cleanup_fail; | |
88 | } | |
89 | ||
90 | graph_version = *(unsigned char*)(data + 4); | |
91 | if (graph_version != GRAPH_VERSION) { | |
92 | error("graph version %X does not match version %X", | |
93 | graph_version, GRAPH_VERSION); | |
94 | goto cleanup_fail; | |
95 | } | |
96 | ||
97 | hash_version = *(unsigned char*)(data + 5); | |
98 | if (hash_version != GRAPH_OID_VERSION) { | |
99 | error("hash version %X does not match version %X", | |
100 | hash_version, GRAPH_OID_VERSION); | |
101 | goto cleanup_fail; | |
102 | } | |
103 | ||
104 | graph = alloc_commit_graph(); | |
105 | ||
106 | graph->hash_len = GRAPH_OID_LEN; | |
107 | graph->num_chunks = *(unsigned char*)(data + 6); | |
108 | graph->graph_fd = fd; | |
109 | graph->data = graph_map; | |
110 | graph->data_len = graph_size; | |
111 | ||
112 | last_chunk_id = 0; | |
113 | last_chunk_offset = 8; | |
114 | chunk_lookup = data + 8; | |
115 | for (i = 0; i < graph->num_chunks; i++) { | |
116 | uint32_t chunk_id = get_be32(chunk_lookup + 0); | |
117 | uint64_t chunk_offset = get_be64(chunk_lookup + 4); | |
118 | int chunk_repeated = 0; | |
119 | ||
120 | chunk_lookup += GRAPH_CHUNKLOOKUP_WIDTH; | |
121 | ||
122 | if (chunk_offset > graph_size - GIT_MAX_RAWSZ) { | |
123 | error("improper chunk offset %08x%08x", (uint32_t)(chunk_offset >> 32), | |
124 | (uint32_t)chunk_offset); | |
125 | goto cleanup_fail; | |
126 | } | |
127 | ||
128 | switch (chunk_id) { | |
129 | case GRAPH_CHUNKID_OIDFANOUT: | |
130 | if (graph->chunk_oid_fanout) | |
131 | chunk_repeated = 1; | |
132 | else | |
133 | graph->chunk_oid_fanout = (uint32_t*)(data + chunk_offset); | |
134 | break; | |
135 | ||
136 | case GRAPH_CHUNKID_OIDLOOKUP: | |
137 | if (graph->chunk_oid_lookup) | |
138 | chunk_repeated = 1; | |
139 | else | |
140 | graph->chunk_oid_lookup = data + chunk_offset; | |
141 | break; | |
142 | ||
143 | case GRAPH_CHUNKID_DATA: | |
144 | if (graph->chunk_commit_data) | |
145 | chunk_repeated = 1; | |
146 | else | |
147 | graph->chunk_commit_data = data + chunk_offset; | |
148 | break; | |
149 | ||
150 | case GRAPH_CHUNKID_LARGEEDGES: | |
151 | if (graph->chunk_large_edges) | |
152 | chunk_repeated = 1; | |
153 | else | |
154 | graph->chunk_large_edges = data + chunk_offset; | |
155 | break; | |
156 | } | |
157 | ||
158 | if (chunk_repeated) { | |
159 | error("chunk id %08x appears multiple times", chunk_id); | |
160 | goto cleanup_fail; | |
161 | } | |
162 | ||
163 | if (last_chunk_id == GRAPH_CHUNKID_OIDLOOKUP) | |
164 | { | |
165 | graph->num_commits = (chunk_offset - last_chunk_offset) | |
166 | / graph->hash_len; | |
167 | } | |
168 | ||
169 | last_chunk_id = chunk_id; | |
170 | last_chunk_offset = chunk_offset; | |
171 | } | |
172 | ||
173 | return graph; | |
174 | ||
175 | cleanup_fail: | |
176 | munmap(graph_map, graph_size); | |
177 | close(fd); | |
178 | exit(1); | |
179 | } | |
180 | ||
177722b3 DS |
181 | /* global storage */ |
182 | static struct commit_graph *commit_graph = NULL; | |
183 | ||
184 | static void prepare_commit_graph_one(const char *obj_dir) | |
185 | { | |
186 | char *graph_name; | |
187 | ||
188 | if (commit_graph) | |
189 | return; | |
190 | ||
191 | graph_name = get_commit_graph_filename(obj_dir); | |
192 | commit_graph = load_commit_graph_one(graph_name); | |
193 | ||
194 | FREE_AND_NULL(graph_name); | |
195 | } | |
196 | ||
197 | static int prepare_commit_graph_run_once = 0; | |
198 | static void prepare_commit_graph(void) | |
199 | { | |
200 | struct alternate_object_database *alt; | |
201 | char *obj_dir; | |
202 | ||
203 | if (prepare_commit_graph_run_once) | |
204 | return; | |
205 | prepare_commit_graph_run_once = 1; | |
206 | ||
207 | obj_dir = get_object_directory(); | |
208 | prepare_commit_graph_one(obj_dir); | |
209 | prepare_alt_odb(); | |
210 | for (alt = alt_odb_list; !commit_graph && alt; alt = alt->next) | |
211 | prepare_commit_graph_one(alt->path); | |
212 | } | |
213 | ||
214 | static void close_commit_graph(void) | |
215 | { | |
216 | if (!commit_graph) | |
217 | return; | |
218 | ||
219 | if (commit_graph->graph_fd >= 0) { | |
220 | munmap((void *)commit_graph->data, commit_graph->data_len); | |
221 | commit_graph->data = NULL; | |
222 | close(commit_graph->graph_fd); | |
223 | } | |
224 | ||
225 | FREE_AND_NULL(commit_graph); | |
226 | } | |
227 | ||
228 | static int bsearch_graph(struct commit_graph *g, struct object_id *oid, uint32_t *pos) | |
229 | { | |
230 | return bsearch_hash(oid->hash, g->chunk_oid_fanout, | |
231 | g->chunk_oid_lookup, g->hash_len, pos); | |
232 | } | |
233 | ||
234 | static struct commit_list **insert_parent_or_die(struct commit_graph *g, | |
235 | uint64_t pos, | |
236 | struct commit_list **pptr) | |
237 | { | |
238 | struct commit *c; | |
239 | struct object_id oid; | |
240 | hashcpy(oid.hash, g->chunk_oid_lookup + g->hash_len * pos); | |
241 | c = lookup_commit(&oid); | |
242 | if (!c) | |
243 | die("could not find commit %s", oid_to_hex(&oid)); | |
244 | c->graph_pos = pos; | |
245 | return &commit_list_insert(c, pptr)->next; | |
246 | } | |
247 | ||
e2838d85 DS |
248 | static void fill_commit_graph_info(struct commit *item, struct commit_graph *g, uint32_t pos) |
249 | { | |
250 | const unsigned char *commit_data = g->chunk_commit_data + GRAPH_DATA_WIDTH * pos; | |
251 | item->graph_pos = pos; | |
252 | item->generation = get_be32(commit_data + g->hash_len + 8) >> 2; | |
253 | } | |
254 | ||
177722b3 DS |
255 | static int fill_commit_in_graph(struct commit *item, struct commit_graph *g, uint32_t pos) |
256 | { | |
177722b3 DS |
257 | uint32_t edge_value; |
258 | uint32_t *parent_data_ptr; | |
259 | uint64_t date_low, date_high; | |
260 | struct commit_list **pptr; | |
261 | const unsigned char *commit_data = g->chunk_commit_data + (g->hash_len + 16) * pos; | |
262 | ||
263 | item->object.parsed = 1; | |
264 | item->graph_pos = pos; | |
265 | ||
7b8a21db | 266 | item->maybe_tree = NULL; |
177722b3 DS |
267 | |
268 | date_high = get_be32(commit_data + g->hash_len + 8) & 0x3; | |
269 | date_low = get_be32(commit_data + g->hash_len + 12); | |
270 | item->date = (timestamp_t)((date_high << 32) | date_low); | |
271 | ||
83073cc9 DS |
272 | item->generation = get_be32(commit_data + g->hash_len + 8) >> 2; |
273 | ||
177722b3 DS |
274 | pptr = &item->parents; |
275 | ||
276 | edge_value = get_be32(commit_data + g->hash_len); | |
277 | if (edge_value == GRAPH_PARENT_NONE) | |
278 | return 1; | |
279 | pptr = insert_parent_or_die(g, edge_value, pptr); | |
280 | ||
281 | edge_value = get_be32(commit_data + g->hash_len + 4); | |
282 | if (edge_value == GRAPH_PARENT_NONE) | |
283 | return 1; | |
284 | if (!(edge_value & GRAPH_OCTOPUS_EDGES_NEEDED)) { | |
285 | pptr = insert_parent_or_die(g, edge_value, pptr); | |
286 | return 1; | |
287 | } | |
288 | ||
289 | parent_data_ptr = (uint32_t*)(g->chunk_large_edges + | |
290 | 4 * (uint64_t)(edge_value & GRAPH_EDGE_LAST_MASK)); | |
291 | do { | |
292 | edge_value = get_be32(parent_data_ptr); | |
293 | pptr = insert_parent_or_die(g, | |
294 | edge_value & GRAPH_EDGE_LAST_MASK, | |
295 | pptr); | |
296 | parent_data_ptr++; | |
297 | } while (!(edge_value & GRAPH_LAST_EDGE)); | |
298 | ||
299 | return 1; | |
300 | } | |
301 | ||
e2838d85 DS |
302 | static int find_commit_in_graph(struct commit *item, struct commit_graph *g, uint32_t *pos) |
303 | { | |
304 | if (item->graph_pos != COMMIT_NOT_FROM_GRAPH) { | |
305 | *pos = item->graph_pos; | |
306 | return 1; | |
307 | } else { | |
308 | return bsearch_graph(g, &(item->object.oid), pos); | |
309 | } | |
310 | } | |
311 | ||
177722b3 DS |
312 | int parse_commit_in_graph(struct commit *item) |
313 | { | |
e2838d85 DS |
314 | uint32_t pos; |
315 | ||
177722b3 DS |
316 | if (!core_commit_graph) |
317 | return 0; | |
318 | if (item->object.parsed) | |
319 | return 1; | |
177722b3 | 320 | prepare_commit_graph(); |
e2838d85 DS |
321 | if (commit_graph && find_commit_in_graph(item, commit_graph, &pos)) |
322 | return fill_commit_in_graph(item, commit_graph, pos); | |
177722b3 DS |
323 | return 0; |
324 | } | |
325 | ||
e2838d85 DS |
326 | void load_commit_graph_info(struct commit *item) |
327 | { | |
328 | uint32_t pos; | |
329 | if (!core_commit_graph) | |
330 | return; | |
331 | prepare_commit_graph(); | |
332 | if (commit_graph && find_commit_in_graph(item, commit_graph, &pos)) | |
333 | fill_commit_graph_info(item, commit_graph, pos); | |
334 | } | |
335 | ||
7b8a21db DS |
336 | static struct tree *load_tree_for_commit(struct commit_graph *g, struct commit *c) |
337 | { | |
338 | struct object_id oid; | |
339 | const unsigned char *commit_data = g->chunk_commit_data + | |
340 | GRAPH_DATA_WIDTH * (c->graph_pos); | |
341 | ||
342 | hashcpy(oid.hash, commit_data); | |
343 | c->maybe_tree = lookup_tree(&oid); | |
344 | ||
345 | return c->maybe_tree; | |
346 | } | |
347 | ||
348 | struct tree *get_commit_tree_in_graph(const struct commit *c) | |
349 | { | |
350 | if (c->maybe_tree) | |
351 | return c->maybe_tree; | |
352 | if (c->graph_pos == COMMIT_NOT_FROM_GRAPH) | |
353 | BUG("get_commit_tree_in_graph called from non-commit-graph commit"); | |
354 | ||
355 | return load_tree_for_commit(commit_graph, (struct commit *)c); | |
356 | } | |
357 | ||
08fd81c9 DS |
358 | static void write_graph_chunk_fanout(struct hashfile *f, |
359 | struct commit **commits, | |
360 | int nr_commits) | |
361 | { | |
362 | int i, count = 0; | |
363 | struct commit **list = commits; | |
364 | ||
365 | /* | |
366 | * Write the first-level table (the list is sorted, | |
367 | * but we use a 256-entry lookup to be able to avoid | |
368 | * having to do eight extra binary search iterations). | |
369 | */ | |
370 | for (i = 0; i < 256; i++) { | |
371 | while (count < nr_commits) { | |
372 | if ((*list)->object.oid.hash[0] != i) | |
373 | break; | |
374 | count++; | |
375 | list++; | |
376 | } | |
377 | ||
378 | hashwrite_be32(f, count); | |
379 | } | |
380 | } | |
381 | ||
382 | static void write_graph_chunk_oids(struct hashfile *f, int hash_len, | |
383 | struct commit **commits, int nr_commits) | |
384 | { | |
385 | struct commit **list = commits; | |
386 | int count; | |
387 | for (count = 0; count < nr_commits; count++, list++) | |
388 | hashwrite(f, (*list)->object.oid.hash, (int)hash_len); | |
389 | } | |
390 | ||
391 | static const unsigned char *commit_to_sha1(size_t index, void *table) | |
392 | { | |
393 | struct commit **commits = table; | |
394 | return commits[index]->object.oid.hash; | |
395 | } | |
396 | ||
397 | static void write_graph_chunk_data(struct hashfile *f, int hash_len, | |
398 | struct commit **commits, int nr_commits) | |
399 | { | |
400 | struct commit **list = commits; | |
401 | struct commit **last = commits + nr_commits; | |
402 | uint32_t num_extra_edges = 0; | |
403 | ||
404 | while (list < last) { | |
405 | struct commit_list *parent; | |
406 | int edge_value; | |
407 | uint32_t packedDate[2]; | |
408 | ||
409 | parse_commit(*list); | |
2e27bd77 | 410 | hashwrite(f, get_commit_tree_oid(*list)->hash, hash_len); |
08fd81c9 DS |
411 | |
412 | parent = (*list)->parents; | |
413 | ||
414 | if (!parent) | |
415 | edge_value = GRAPH_PARENT_NONE; | |
416 | else { | |
417 | edge_value = sha1_pos(parent->item->object.oid.hash, | |
418 | commits, | |
419 | nr_commits, | |
420 | commit_to_sha1); | |
421 | ||
422 | if (edge_value < 0) | |
423 | edge_value = GRAPH_PARENT_MISSING; | |
424 | } | |
425 | ||
426 | hashwrite_be32(f, edge_value); | |
427 | ||
428 | if (parent) | |
429 | parent = parent->next; | |
430 | ||
431 | if (!parent) | |
432 | edge_value = GRAPH_PARENT_NONE; | |
433 | else if (parent->next) | |
434 | edge_value = GRAPH_OCTOPUS_EDGES_NEEDED | num_extra_edges; | |
435 | else { | |
436 | edge_value = sha1_pos(parent->item->object.oid.hash, | |
437 | commits, | |
438 | nr_commits, | |
439 | commit_to_sha1); | |
440 | if (edge_value < 0) | |
441 | edge_value = GRAPH_PARENT_MISSING; | |
442 | } | |
443 | ||
444 | hashwrite_be32(f, edge_value); | |
445 | ||
446 | if (edge_value & GRAPH_OCTOPUS_EDGES_NEEDED) { | |
447 | do { | |
448 | num_extra_edges++; | |
449 | parent = parent->next; | |
450 | } while (parent); | |
451 | } | |
452 | ||
453 | if (sizeof((*list)->date) > 4) | |
454 | packedDate[0] = htonl(((*list)->date >> 32) & 0x3); | |
455 | else | |
456 | packedDate[0] = 0; | |
457 | ||
3258c663 DS |
458 | packedDate[0] |= htonl((*list)->generation << 2); |
459 | ||
08fd81c9 DS |
460 | packedDate[1] = htonl((*list)->date); |
461 | hashwrite(f, packedDate, 8); | |
462 | ||
463 | list++; | |
464 | } | |
465 | } | |
466 | ||
467 | static void write_graph_chunk_large_edges(struct hashfile *f, | |
468 | struct commit **commits, | |
469 | int nr_commits) | |
470 | { | |
471 | struct commit **list = commits; | |
472 | struct commit **last = commits + nr_commits; | |
473 | struct commit_list *parent; | |
474 | ||
475 | while (list < last) { | |
476 | int num_parents = 0; | |
477 | for (parent = (*list)->parents; num_parents < 3 && parent; | |
478 | parent = parent->next) | |
479 | num_parents++; | |
480 | ||
481 | if (num_parents <= 2) { | |
482 | list++; | |
483 | continue; | |
484 | } | |
485 | ||
486 | /* Since num_parents > 2, this initializer is safe. */ | |
487 | for (parent = (*list)->parents->next; parent; parent = parent->next) { | |
488 | int edge_value = sha1_pos(parent->item->object.oid.hash, | |
489 | commits, | |
490 | nr_commits, | |
491 | commit_to_sha1); | |
492 | ||
493 | if (edge_value < 0) | |
494 | edge_value = GRAPH_PARENT_MISSING; | |
495 | else if (!parent->next) | |
496 | edge_value |= GRAPH_LAST_EDGE; | |
497 | ||
498 | hashwrite_be32(f, edge_value); | |
499 | } | |
500 | ||
501 | list++; | |
502 | } | |
503 | } | |
504 | ||
505 | static int commit_compare(const void *_a, const void *_b) | |
506 | { | |
507 | const struct object_id *a = (const struct object_id *)_a; | |
508 | const struct object_id *b = (const struct object_id *)_b; | |
509 | return oidcmp(a, b); | |
510 | } | |
511 | ||
512 | struct packed_commit_list { | |
513 | struct commit **list; | |
514 | int nr; | |
515 | int alloc; | |
516 | }; | |
517 | ||
518 | struct packed_oid_list { | |
519 | struct object_id *list; | |
520 | int nr; | |
521 | int alloc; | |
522 | }; | |
523 | ||
524 | static int add_packed_commits(const struct object_id *oid, | |
525 | struct packed_git *pack, | |
526 | uint32_t pos, | |
527 | void *data) | |
528 | { | |
529 | struct packed_oid_list *list = (struct packed_oid_list*)data; | |
530 | enum object_type type; | |
531 | off_t offset = nth_packed_object_offset(pack, pos); | |
532 | struct object_info oi = OBJECT_INFO_INIT; | |
533 | ||
534 | oi.typep = &type; | |
535 | if (packed_object_info(pack, offset, &oi) < 0) | |
536 | die("unable to get type of object %s", oid_to_hex(oid)); | |
537 | ||
538 | if (type != OBJ_COMMIT) | |
539 | return 0; | |
540 | ||
541 | ALLOC_GROW(list->list, list->nr + 1, list->alloc); | |
542 | oidcpy(&(list->list[list->nr]), oid); | |
543 | list->nr++; | |
544 | ||
545 | return 0; | |
546 | } | |
547 | ||
4f2542b4 DS |
548 | static void add_missing_parents(struct packed_oid_list *oids, struct commit *commit) |
549 | { | |
550 | struct commit_list *parent; | |
551 | for (parent = commit->parents; parent; parent = parent->next) { | |
552 | if (!(parent->item->object.flags & UNINTERESTING)) { | |
553 | ALLOC_GROW(oids->list, oids->nr + 1, oids->alloc); | |
554 | oidcpy(&oids->list[oids->nr], &(parent->item->object.oid)); | |
555 | oids->nr++; | |
556 | parent->item->object.flags |= UNINTERESTING; | |
557 | } | |
558 | } | |
559 | } | |
560 | ||
561 | static void close_reachable(struct packed_oid_list *oids) | |
562 | { | |
563 | int i; | |
564 | struct commit *commit; | |
565 | ||
566 | for (i = 0; i < oids->nr; i++) { | |
567 | commit = lookup_commit(&oids->list[i]); | |
568 | if (commit) | |
569 | commit->object.flags |= UNINTERESTING; | |
570 | } | |
571 | ||
572 | /* | |
573 | * As this loop runs, oids->nr may grow, but not more | |
574 | * than the number of missing commits in the reachable | |
575 | * closure. | |
576 | */ | |
577 | for (i = 0; i < oids->nr; i++) { | |
578 | commit = lookup_commit(&oids->list[i]); | |
579 | ||
580 | if (commit && !parse_commit(commit)) | |
581 | add_missing_parents(oids, commit); | |
582 | } | |
583 | ||
584 | for (i = 0; i < oids->nr; i++) { | |
585 | commit = lookup_commit(&oids->list[i]); | |
586 | ||
587 | if (commit) | |
588 | commit->object.flags &= ~UNINTERESTING; | |
589 | } | |
590 | } | |
591 | ||
3258c663 DS |
592 | static void compute_generation_numbers(struct packed_commit_list* commits) |
593 | { | |
594 | int i; | |
595 | struct commit_list *list = NULL; | |
596 | ||
597 | for (i = 0; i < commits->nr; i++) { | |
598 | if (commits->list[i]->generation != GENERATION_NUMBER_INFINITY && | |
599 | commits->list[i]->generation != GENERATION_NUMBER_ZERO) | |
600 | continue; | |
601 | ||
602 | commit_list_insert(commits->list[i], &list); | |
603 | while (list) { | |
604 | struct commit *current = list->item; | |
605 | struct commit_list *parent; | |
606 | int all_parents_computed = 1; | |
607 | uint32_t max_generation = 0; | |
608 | ||
609 | for (parent = current->parents; parent; parent = parent->next) { | |
610 | if (parent->item->generation == GENERATION_NUMBER_INFINITY || | |
611 | parent->item->generation == GENERATION_NUMBER_ZERO) { | |
612 | all_parents_computed = 0; | |
613 | commit_list_insert(parent->item, &list); | |
614 | break; | |
615 | } else if (parent->item->generation > max_generation) { | |
616 | max_generation = parent->item->generation; | |
617 | } | |
618 | } | |
619 | ||
620 | if (all_parents_computed) { | |
621 | current->generation = max_generation + 1; | |
622 | pop_commit(&list); | |
623 | ||
624 | if (current->generation > GENERATION_NUMBER_MAX) | |
625 | current->generation = GENERATION_NUMBER_MAX; | |
626 | } | |
627 | } | |
628 | } | |
629 | } | |
630 | ||
049d51a2 DS |
631 | void write_commit_graph(const char *obj_dir, |
632 | const char **pack_indexes, | |
3d5df01b DS |
633 | int nr_packs, |
634 | const char **commit_hex, | |
7547b95b DS |
635 | int nr_commits, |
636 | int append) | |
08fd81c9 DS |
637 | { |
638 | struct packed_oid_list oids; | |
639 | struct packed_commit_list commits; | |
640 | struct hashfile *f; | |
641 | uint32_t i, count_distinct = 0; | |
642 | char *graph_name; | |
643 | int fd; | |
644 | struct lock_file lk = LOCK_INIT; | |
645 | uint32_t chunk_ids[5]; | |
646 | uint64_t chunk_offsets[5]; | |
647 | int num_chunks; | |
648 | int num_extra_edges; | |
649 | struct commit_list *parent; | |
650 | ||
651 | oids.nr = 0; | |
652 | oids.alloc = approximate_object_count() / 4; | |
653 | ||
7547b95b DS |
654 | if (append) { |
655 | prepare_commit_graph_one(obj_dir); | |
656 | if (commit_graph) | |
657 | oids.alloc += commit_graph->num_commits; | |
658 | } | |
659 | ||
08fd81c9 DS |
660 | if (oids.alloc < 1024) |
661 | oids.alloc = 1024; | |
662 | ALLOC_ARRAY(oids.list, oids.alloc); | |
663 | ||
7547b95b DS |
664 | if (append && commit_graph) { |
665 | for (i = 0; i < commit_graph->num_commits; i++) { | |
666 | const unsigned char *hash = commit_graph->chunk_oid_lookup + | |
667 | commit_graph->hash_len * i; | |
668 | hashcpy(oids.list[oids.nr++].hash, hash); | |
669 | } | |
670 | } | |
671 | ||
049d51a2 DS |
672 | if (pack_indexes) { |
673 | struct strbuf packname = STRBUF_INIT; | |
674 | int dirlen; | |
675 | strbuf_addf(&packname, "%s/pack/", obj_dir); | |
676 | dirlen = packname.len; | |
677 | for (i = 0; i < nr_packs; i++) { | |
678 | struct packed_git *p; | |
679 | strbuf_setlen(&packname, dirlen); | |
680 | strbuf_addstr(&packname, pack_indexes[i]); | |
681 | p = add_packed_git(packname.buf, packname.len, 1); | |
682 | if (!p) | |
683 | die("error adding pack %s", packname.buf); | |
684 | if (open_pack_index(p)) | |
685 | die("error opening index for %s", packname.buf); | |
686 | for_each_object_in_pack(p, add_packed_commits, &oids); | |
687 | close_pack(p); | |
688 | } | |
689 | strbuf_release(&packname); | |
3d5df01b DS |
690 | } |
691 | ||
692 | if (commit_hex) { | |
693 | for (i = 0; i < nr_commits; i++) { | |
694 | const char *end; | |
695 | struct object_id oid; | |
696 | struct commit *result; | |
697 | ||
698 | if (commit_hex[i] && parse_oid_hex(commit_hex[i], &oid, &end)) | |
699 | continue; | |
700 | ||
701 | result = lookup_commit_reference_gently(&oid, 1); | |
702 | ||
703 | if (result) { | |
704 | ALLOC_GROW(oids.list, oids.nr + 1, oids.alloc); | |
705 | oidcpy(&oids.list[oids.nr], &(result->object.oid)); | |
706 | oids.nr++; | |
707 | } | |
708 | } | |
709 | } | |
710 | ||
711 | if (!pack_indexes && !commit_hex) | |
049d51a2 DS |
712 | for_each_packed_object(add_packed_commits, &oids, 0); |
713 | ||
4f2542b4 | 714 | close_reachable(&oids); |
08fd81c9 DS |
715 | |
716 | QSORT(oids.list, oids.nr, commit_compare); | |
717 | ||
718 | count_distinct = 1; | |
719 | for (i = 1; i < oids.nr; i++) { | |
720 | if (oidcmp(&oids.list[i-1], &oids.list[i])) | |
721 | count_distinct++; | |
722 | } | |
723 | ||
724 | if (count_distinct >= GRAPH_PARENT_MISSING) | |
725 | die(_("the commit graph format cannot write %d commits"), count_distinct); | |
726 | ||
727 | commits.nr = 0; | |
728 | commits.alloc = count_distinct; | |
729 | ALLOC_ARRAY(commits.list, commits.alloc); | |
730 | ||
731 | num_extra_edges = 0; | |
732 | for (i = 0; i < oids.nr; i++) { | |
733 | int num_parents = 0; | |
734 | if (i > 0 && !oidcmp(&oids.list[i-1], &oids.list[i])) | |
735 | continue; | |
736 | ||
737 | commits.list[commits.nr] = lookup_commit(&oids.list[i]); | |
738 | parse_commit(commits.list[commits.nr]); | |
739 | ||
740 | for (parent = commits.list[commits.nr]->parents; | |
741 | parent; parent = parent->next) | |
742 | num_parents++; | |
743 | ||
744 | if (num_parents > 2) | |
745 | num_extra_edges += num_parents - 1; | |
746 | ||
747 | commits.nr++; | |
748 | } | |
749 | num_chunks = num_extra_edges ? 4 : 3; | |
750 | ||
751 | if (commits.nr >= GRAPH_PARENT_MISSING) | |
752 | die(_("too many commits to write graph")); | |
753 | ||
3258c663 DS |
754 | compute_generation_numbers(&commits); |
755 | ||
08fd81c9 DS |
756 | graph_name = get_commit_graph_filename(obj_dir); |
757 | fd = hold_lock_file_for_update(&lk, graph_name, 0); | |
758 | ||
759 | if (fd < 0) { | |
760 | struct strbuf folder = STRBUF_INIT; | |
761 | strbuf_addstr(&folder, graph_name); | |
762 | strbuf_setlen(&folder, strrchr(folder.buf, '/') - folder.buf); | |
763 | ||
764 | if (mkdir(folder.buf, 0777) < 0) | |
765 | die_errno(_("cannot mkdir %s"), folder.buf); | |
766 | strbuf_release(&folder); | |
767 | ||
768 | fd = hold_lock_file_for_update(&lk, graph_name, LOCK_DIE_ON_ERROR); | |
769 | ||
770 | if (fd < 0) | |
771 | die_errno("unable to create '%s'", graph_name); | |
772 | } | |
773 | ||
774 | f = hashfd(lk.tempfile->fd, lk.tempfile->filename.buf); | |
775 | ||
776 | hashwrite_be32(f, GRAPH_SIGNATURE); | |
777 | ||
778 | hashwrite_u8(f, GRAPH_VERSION); | |
779 | hashwrite_u8(f, GRAPH_OID_VERSION); | |
780 | hashwrite_u8(f, num_chunks); | |
781 | hashwrite_u8(f, 0); /* unused padding byte */ | |
782 | ||
783 | chunk_ids[0] = GRAPH_CHUNKID_OIDFANOUT; | |
784 | chunk_ids[1] = GRAPH_CHUNKID_OIDLOOKUP; | |
785 | chunk_ids[2] = GRAPH_CHUNKID_DATA; | |
786 | if (num_extra_edges) | |
787 | chunk_ids[3] = GRAPH_CHUNKID_LARGEEDGES; | |
788 | else | |
789 | chunk_ids[3] = 0; | |
790 | chunk_ids[4] = 0; | |
791 | ||
792 | chunk_offsets[0] = 8 + (num_chunks + 1) * GRAPH_CHUNKLOOKUP_WIDTH; | |
793 | chunk_offsets[1] = chunk_offsets[0] + GRAPH_FANOUT_SIZE; | |
794 | chunk_offsets[2] = chunk_offsets[1] + GRAPH_OID_LEN * commits.nr; | |
795 | chunk_offsets[3] = chunk_offsets[2] + (GRAPH_OID_LEN + 16) * commits.nr; | |
796 | chunk_offsets[4] = chunk_offsets[3] + 4 * num_extra_edges; | |
797 | ||
798 | for (i = 0; i <= num_chunks; i++) { | |
799 | uint32_t chunk_write[3]; | |
800 | ||
801 | chunk_write[0] = htonl(chunk_ids[i]); | |
802 | chunk_write[1] = htonl(chunk_offsets[i] >> 32); | |
803 | chunk_write[2] = htonl(chunk_offsets[i] & 0xffffffff); | |
804 | hashwrite(f, chunk_write, 12); | |
805 | } | |
806 | ||
807 | write_graph_chunk_fanout(f, commits.list, commits.nr); | |
808 | write_graph_chunk_oids(f, GRAPH_OID_LEN, commits.list, commits.nr); | |
809 | write_graph_chunk_data(f, GRAPH_OID_LEN, commits.list, commits.nr); | |
810 | write_graph_chunk_large_edges(f, commits.list, commits.nr); | |
811 | ||
177722b3 | 812 | close_commit_graph(); |
08fd81c9 DS |
813 | finalize_hashfile(f, NULL, CSUM_HASH_IN_STREAM | CSUM_FSYNC); |
814 | commit_lock_file(&lk); | |
815 | ||
816 | free(oids.list); | |
817 | oids.alloc = 0; | |
818 | oids.nr = 0; | |
819 | } |