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Commit | Line | Data |
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08fd81c9 DS |
1 | #include "cache.h" |
2 | #include "config.h" | |
33286dcd | 3 | #include "dir.h" |
08fd81c9 DS |
4 | #include "git-compat-util.h" |
5 | #include "lockfile.h" | |
6 | #include "pack.h" | |
7 | #include "packfile.h" | |
8 | #include "commit.h" | |
9 | #include "object.h" | |
59fb8770 | 10 | #include "refs.h" |
08fd81c9 DS |
11 | #include "revision.h" |
12 | #include "sha1-lookup.h" | |
13 | #include "commit-graph.h" | |
b10edb2d | 14 | #include "object-store.h" |
96af91d4 | 15 | #include "alloc.h" |
d6538246 DS |
16 | #include "hashmap.h" |
17 | #include "replace-object.h" | |
7b0f2292 | 18 | #include "progress.h" |
08fd81c9 DS |
19 | |
20 | #define GRAPH_SIGNATURE 0x43475048 /* "CGPH" */ | |
21 | #define GRAPH_CHUNKID_OIDFANOUT 0x4f494446 /* "OIDF" */ | |
22 | #define GRAPH_CHUNKID_OIDLOOKUP 0x4f49444c /* "OIDL" */ | |
23 | #define GRAPH_CHUNKID_DATA 0x43444154 /* "CDAT" */ | |
5af7417b | 24 | #define GRAPH_CHUNKID_EXTRAEDGES 0x45444745 /* "EDGE" */ |
08fd81c9 | 25 | |
c1665998 | 26 | #define GRAPH_DATA_WIDTH (the_hash_algo->rawsz + 16) |
08fd81c9 DS |
27 | |
28 | #define GRAPH_VERSION_1 0x1 | |
29 | #define GRAPH_VERSION GRAPH_VERSION_1 | |
30 | ||
5af7417b | 31 | #define GRAPH_EXTRA_EDGES_NEEDED 0x80000000 |
08fd81c9 DS |
32 | #define GRAPH_EDGE_LAST_MASK 0x7fffffff |
33 | #define GRAPH_PARENT_NONE 0x70000000 | |
34 | ||
35 | #define GRAPH_LAST_EDGE 0x80000000 | |
36 | ||
0e3b97cc | 37 | #define GRAPH_HEADER_SIZE 8 |
08fd81c9 DS |
38 | #define GRAPH_FANOUT_SIZE (4 * 256) |
39 | #define GRAPH_CHUNKLOOKUP_WIDTH 12 | |
0e3b97cc | 40 | #define GRAPH_MIN_SIZE (GRAPH_HEADER_SIZE + 4 * GRAPH_CHUNKLOOKUP_WIDTH \ |
c1665998 | 41 | + GRAPH_FANOUT_SIZE + the_hash_algo->rawsz) |
08fd81c9 | 42 | |
2a2e32bd | 43 | char *get_commit_graph_filename(const char *obj_dir) |
08fd81c9 DS |
44 | { |
45 | return xstrfmt("%s/info/commit-graph", obj_dir); | |
46 | } | |
47 | ||
c1665998 | 48 | static uint8_t oid_version(void) |
49 | { | |
50 | return 1; | |
51 | } | |
52 | ||
2a2e32bd DS |
53 | static struct commit_graph *alloc_commit_graph(void) |
54 | { | |
55 | struct commit_graph *g = xcalloc(1, sizeof(*g)); | |
56 | g->graph_fd = -1; | |
57 | ||
58 | return g; | |
59 | } | |
60 | ||
d6538246 DS |
61 | extern int read_replace_refs; |
62 | ||
63 | static int commit_graph_compatible(struct repository *r) | |
64 | { | |
5cef295f DS |
65 | if (!r->gitdir) |
66 | return 0; | |
67 | ||
d6538246 DS |
68 | if (read_replace_refs) { |
69 | prepare_replace_object(r); | |
70 | if (hashmap_get_size(&r->objects->replace_map->map)) | |
71 | return 0; | |
72 | } | |
73 | ||
20fd6d57 DS |
74 | prepare_commit_graft(r); |
75 | if (r->parsed_objects && r->parsed_objects->grafts_nr) | |
76 | return 0; | |
77 | if (is_repository_shallow(r)) | |
78 | return 0; | |
79 | ||
d6538246 DS |
80 | return 1; |
81 | } | |
82 | ||
61df89c8 ÆAB |
83 | int open_commit_graph(const char *graph_file, int *fd, struct stat *st) |
84 | { | |
85 | *fd = git_open(graph_file); | |
86 | if (*fd < 0) | |
87 | return 0; | |
88 | if (fstat(*fd, st)) { | |
89 | close(*fd); | |
90 | return 0; | |
91 | } | |
92 | return 1; | |
93 | } | |
94 | ||
67a530fa | 95 | struct commit_graph *load_commit_graph_one_fd_st(int fd, struct stat *st) |
2a2e32bd DS |
96 | { |
97 | void *graph_map; | |
2a2e32bd | 98 | size_t graph_size; |
aa658574 | 99 | struct commit_graph *ret; |
2a2e32bd | 100 | |
61df89c8 | 101 | graph_size = xsize_t(st->st_size); |
2a2e32bd DS |
102 | |
103 | if (graph_size < GRAPH_MIN_SIZE) { | |
104 | close(fd); | |
67a530fa | 105 | error(_("commit-graph file is too small")); |
61df89c8 | 106 | return NULL; |
2a2e32bd DS |
107 | } |
108 | graph_map = xmmap(NULL, graph_size, PROT_READ, MAP_PRIVATE, fd, 0); | |
aa658574 JS |
109 | ret = parse_commit_graph(graph_map, fd, graph_size); |
110 | ||
111 | if (!ret) { | |
112 | munmap(graph_map, graph_size); | |
113 | close(fd); | |
aa658574 JS |
114 | } |
115 | ||
116 | return ret; | |
117 | } | |
118 | ||
2ac138d5 ÆAB |
119 | static int verify_commit_graph_lite(struct commit_graph *g) |
120 | { | |
121 | /* | |
122 | * Basic validation shared between parse_commit_graph() | |
123 | * which'll be called every time the graph is used, and the | |
124 | * much more expensive verify_commit_graph() used by | |
125 | * "commit-graph verify". | |
126 | * | |
127 | * There should only be very basic checks here to ensure that | |
128 | * we don't e.g. segfault in fill_commit_in_graph(), but | |
129 | * because this is a very hot codepath nothing that e.g. loops | |
130 | * over g->num_commits, or runs a checksum on the commit-graph | |
131 | * itself. | |
132 | */ | |
133 | if (!g->chunk_oid_fanout) { | |
134 | error("commit-graph is missing the OID Fanout chunk"); | |
135 | return 1; | |
136 | } | |
137 | if (!g->chunk_oid_lookup) { | |
138 | error("commit-graph is missing the OID Lookup chunk"); | |
139 | return 1; | |
140 | } | |
141 | if (!g->chunk_commit_data) { | |
142 | error("commit-graph is missing the Commit Data chunk"); | |
143 | return 1; | |
144 | } | |
145 | ||
146 | return 0; | |
147 | } | |
148 | ||
aa658574 JS |
149 | struct commit_graph *parse_commit_graph(void *graph_map, int fd, |
150 | size_t graph_size) | |
151 | { | |
152 | const unsigned char *data, *chunk_lookup; | |
153 | uint32_t i; | |
154 | struct commit_graph *graph; | |
155 | uint64_t last_chunk_offset; | |
156 | uint32_t last_chunk_id; | |
157 | uint32_t graph_signature; | |
158 | unsigned char graph_version, hash_version; | |
159 | ||
160 | if (!graph_map) | |
161 | return NULL; | |
162 | ||
163 | if (graph_size < GRAPH_MIN_SIZE) | |
164 | return NULL; | |
165 | ||
2a2e32bd DS |
166 | data = (const unsigned char *)graph_map; |
167 | ||
168 | graph_signature = get_be32(data); | |
169 | if (graph_signature != GRAPH_SIGNATURE) { | |
93b4405f | 170 | error(_("commit-graph signature %X does not match signature %X"), |
2a2e32bd | 171 | graph_signature, GRAPH_SIGNATURE); |
aa658574 | 172 | return NULL; |
2a2e32bd DS |
173 | } |
174 | ||
175 | graph_version = *(unsigned char*)(data + 4); | |
176 | if (graph_version != GRAPH_VERSION) { | |
93b4405f | 177 | error(_("commit-graph version %X does not match version %X"), |
2a2e32bd | 178 | graph_version, GRAPH_VERSION); |
aa658574 | 179 | return NULL; |
2a2e32bd DS |
180 | } |
181 | ||
182 | hash_version = *(unsigned char*)(data + 5); | |
c1665998 | 183 | if (hash_version != oid_version()) { |
93b4405f | 184 | error(_("commit-graph hash version %X does not match version %X"), |
c1665998 | 185 | hash_version, oid_version()); |
aa658574 | 186 | return NULL; |
2a2e32bd DS |
187 | } |
188 | ||
189 | graph = alloc_commit_graph(); | |
190 | ||
c1665998 | 191 | graph->hash_len = the_hash_algo->rawsz; |
2a2e32bd DS |
192 | graph->num_chunks = *(unsigned char*)(data + 6); |
193 | graph->graph_fd = fd; | |
194 | graph->data = graph_map; | |
195 | graph->data_len = graph_size; | |
196 | ||
197 | last_chunk_id = 0; | |
198 | last_chunk_offset = 8; | |
199 | chunk_lookup = data + 8; | |
200 | for (i = 0; i < graph->num_chunks; i++) { | |
d2b86fba JS |
201 | uint32_t chunk_id; |
202 | uint64_t chunk_offset; | |
2a2e32bd DS |
203 | int chunk_repeated = 0; |
204 | ||
d2b86fba JS |
205 | if (data + graph_size - chunk_lookup < |
206 | GRAPH_CHUNKLOOKUP_WIDTH) { | |
93b4405f | 207 | error(_("commit-graph chunk lookup table entry missing; file may be incomplete")); |
d2b86fba JS |
208 | free(graph); |
209 | return NULL; | |
210 | } | |
211 | ||
212 | chunk_id = get_be32(chunk_lookup + 0); | |
213 | chunk_offset = get_be64(chunk_lookup + 4); | |
214 | ||
2a2e32bd DS |
215 | chunk_lookup += GRAPH_CHUNKLOOKUP_WIDTH; |
216 | ||
c1665998 | 217 | if (chunk_offset > graph_size - the_hash_algo->rawsz) { |
93b4405f | 218 | error(_("commit-graph improper chunk offset %08x%08x"), (uint32_t)(chunk_offset >> 32), |
2a2e32bd | 219 | (uint32_t)chunk_offset); |
aa658574 JS |
220 | free(graph); |
221 | return NULL; | |
2a2e32bd DS |
222 | } |
223 | ||
224 | switch (chunk_id) { | |
225 | case GRAPH_CHUNKID_OIDFANOUT: | |
226 | if (graph->chunk_oid_fanout) | |
227 | chunk_repeated = 1; | |
228 | else | |
229 | graph->chunk_oid_fanout = (uint32_t*)(data + chunk_offset); | |
230 | break; | |
231 | ||
232 | case GRAPH_CHUNKID_OIDLOOKUP: | |
233 | if (graph->chunk_oid_lookup) | |
234 | chunk_repeated = 1; | |
235 | else | |
236 | graph->chunk_oid_lookup = data + chunk_offset; | |
237 | break; | |
238 | ||
239 | case GRAPH_CHUNKID_DATA: | |
240 | if (graph->chunk_commit_data) | |
241 | chunk_repeated = 1; | |
242 | else | |
243 | graph->chunk_commit_data = data + chunk_offset; | |
244 | break; | |
245 | ||
5af7417b SG |
246 | case GRAPH_CHUNKID_EXTRAEDGES: |
247 | if (graph->chunk_extra_edges) | |
2a2e32bd DS |
248 | chunk_repeated = 1; |
249 | else | |
5af7417b | 250 | graph->chunk_extra_edges = data + chunk_offset; |
2a2e32bd DS |
251 | break; |
252 | } | |
253 | ||
254 | if (chunk_repeated) { | |
93b4405f | 255 | error(_("commit-graph chunk id %08x appears multiple times"), chunk_id); |
aa658574 JS |
256 | free(graph); |
257 | return NULL; | |
2a2e32bd DS |
258 | } |
259 | ||
260 | if (last_chunk_id == GRAPH_CHUNKID_OIDLOOKUP) | |
261 | { | |
262 | graph->num_commits = (chunk_offset - last_chunk_offset) | |
263 | / graph->hash_len; | |
264 | } | |
265 | ||
266 | last_chunk_id = chunk_id; | |
267 | last_chunk_offset = chunk_offset; | |
268 | } | |
269 | ||
2ac138d5 ÆAB |
270 | if (verify_commit_graph_lite(graph)) |
271 | return NULL; | |
272 | ||
2a2e32bd | 273 | return graph; |
2a2e32bd DS |
274 | } |
275 | ||
61df89c8 ÆAB |
276 | static struct commit_graph *load_commit_graph_one(const char *graph_file) |
277 | { | |
278 | ||
279 | struct stat st; | |
280 | int fd; | |
281 | int open_ok = open_commit_graph(graph_file, &fd, &st); | |
282 | ||
283 | if (!open_ok) | |
284 | return NULL; | |
285 | ||
67a530fa | 286 | return load_commit_graph_one_fd_st(fd, &st); |
61df89c8 ÆAB |
287 | } |
288 | ||
dade47c0 | 289 | static void prepare_commit_graph_one(struct repository *r, const char *obj_dir) |
177722b3 DS |
290 | { |
291 | char *graph_name; | |
292 | ||
dade47c0 | 293 | if (r->objects->commit_graph) |
177722b3 DS |
294 | return; |
295 | ||
296 | graph_name = get_commit_graph_filename(obj_dir); | |
dade47c0 | 297 | r->objects->commit_graph = |
85277506 | 298 | load_commit_graph_one(graph_name); |
177722b3 DS |
299 | |
300 | FREE_AND_NULL(graph_name); | |
301 | } | |
302 | ||
5faf357b JT |
303 | /* |
304 | * Return 1 if commit_graph is non-NULL, and 0 otherwise. | |
305 | * | |
306 | * On the first invocation, this function attemps to load the commit | |
307 | * graph if the_repository is configured to have one. | |
308 | */ | |
dade47c0 | 309 | static int prepare_commit_graph(struct repository *r) |
177722b3 | 310 | { |
263db403 | 311 | struct object_directory *odb; |
dade47c0 JT |
312 | int config_value; |
313 | ||
43d35618 ÆAB |
314 | if (git_env_bool(GIT_TEST_COMMIT_GRAPH_DIE_ON_LOAD, 0)) |
315 | die("dying as requested by the '%s' variable on commit-graph load!", | |
316 | GIT_TEST_COMMIT_GRAPH_DIE_ON_LOAD); | |
317 | ||
dade47c0 JT |
318 | if (r->objects->commit_graph_attempted) |
319 | return !!r->objects->commit_graph; | |
320 | r->objects->commit_graph_attempted = 1; | |
321 | ||
859fdc0c DS |
322 | if (!git_env_bool(GIT_TEST_COMMIT_GRAPH, 0) && |
323 | (repo_config_get_bool(r, "core.commitgraph", &config_value) || | |
324 | !config_value)) | |
dade47c0 JT |
325 | /* |
326 | * This repository is not configured to use commit graphs, so | |
327 | * do not load one. (But report commit_graph_attempted anyway | |
328 | * so that commit graph loading is not attempted again for this | |
329 | * repository.) | |
330 | */ | |
5faf357b JT |
331 | return 0; |
332 | ||
d6538246 DS |
333 | if (!commit_graph_compatible(r)) |
334 | return 0; | |
335 | ||
dade47c0 | 336 | prepare_alt_odb(r); |
f0eaf638 | 337 | for (odb = r->objects->odb; |
263db403 JK |
338 | !r->objects->commit_graph && odb; |
339 | odb = odb->next) | |
340 | prepare_commit_graph_one(r, odb->path); | |
dade47c0 | 341 | return !!r->objects->commit_graph; |
177722b3 DS |
342 | } |
343 | ||
6cc01743 DS |
344 | int generation_numbers_enabled(struct repository *r) |
345 | { | |
346 | uint32_t first_generation; | |
347 | struct commit_graph *g; | |
348 | if (!prepare_commit_graph(r)) | |
349 | return 0; | |
350 | ||
351 | g = r->objects->commit_graph; | |
352 | ||
353 | if (!g->num_commits) | |
354 | return 0; | |
355 | ||
356 | first_generation = get_be32(g->chunk_commit_data + | |
357 | g->hash_len + 8) >> 2; | |
358 | ||
359 | return !!first_generation; | |
360 | } | |
361 | ||
829a3215 | 362 | void close_commit_graph(struct repository *r) |
177722b3 | 363 | { |
829a3215 DS |
364 | free_commit_graph(r->objects->commit_graph); |
365 | r->objects->commit_graph = NULL; | |
177722b3 DS |
366 | } |
367 | ||
368 | static int bsearch_graph(struct commit_graph *g, struct object_id *oid, uint32_t *pos) | |
369 | { | |
370 | return bsearch_hash(oid->hash, g->chunk_oid_fanout, | |
371 | g->chunk_oid_lookup, g->hash_len, pos); | |
372 | } | |
373 | ||
4f542b7a SB |
374 | static struct commit_list **insert_parent_or_die(struct repository *r, |
375 | struct commit_graph *g, | |
177722b3 DS |
376 | uint64_t pos, |
377 | struct commit_list **pptr) | |
378 | { | |
379 | struct commit *c; | |
380 | struct object_id oid; | |
96af91d4 | 381 | |
53614b13 DS |
382 | if (pos >= g->num_commits) |
383 | die("invalid parent position %"PRIu64, pos); | |
384 | ||
177722b3 | 385 | hashcpy(oid.hash, g->chunk_oid_lookup + g->hash_len * pos); |
4f542b7a | 386 | c = lookup_commit(r, &oid); |
177722b3 | 387 | if (!c) |
4f5b532d | 388 | die(_("could not find commit %s"), oid_to_hex(&oid)); |
177722b3 DS |
389 | c->graph_pos = pos; |
390 | return &commit_list_insert(c, pptr)->next; | |
391 | } | |
392 | ||
e2838d85 DS |
393 | static void fill_commit_graph_info(struct commit *item, struct commit_graph *g, uint32_t pos) |
394 | { | |
395 | const unsigned char *commit_data = g->chunk_commit_data + GRAPH_DATA_WIDTH * pos; | |
396 | item->graph_pos = pos; | |
397 | item->generation = get_be32(commit_data + g->hash_len + 8) >> 2; | |
398 | } | |
399 | ||
4f542b7a SB |
400 | static int fill_commit_in_graph(struct repository *r, |
401 | struct commit *item, | |
402 | struct commit_graph *g, uint32_t pos) | |
177722b3 | 403 | { |
177722b3 DS |
404 | uint32_t edge_value; |
405 | uint32_t *parent_data_ptr; | |
406 | uint64_t date_low, date_high; | |
407 | struct commit_list **pptr; | |
408 | const unsigned char *commit_data = g->chunk_commit_data + (g->hash_len + 16) * pos; | |
409 | ||
410 | item->object.parsed = 1; | |
411 | item->graph_pos = pos; | |
412 | ||
7b8a21db | 413 | item->maybe_tree = NULL; |
177722b3 DS |
414 | |
415 | date_high = get_be32(commit_data + g->hash_len + 8) & 0x3; | |
416 | date_low = get_be32(commit_data + g->hash_len + 12); | |
417 | item->date = (timestamp_t)((date_high << 32) | date_low); | |
418 | ||
83073cc9 DS |
419 | item->generation = get_be32(commit_data + g->hash_len + 8) >> 2; |
420 | ||
177722b3 DS |
421 | pptr = &item->parents; |
422 | ||
423 | edge_value = get_be32(commit_data + g->hash_len); | |
424 | if (edge_value == GRAPH_PARENT_NONE) | |
425 | return 1; | |
4f542b7a | 426 | pptr = insert_parent_or_die(r, g, edge_value, pptr); |
177722b3 DS |
427 | |
428 | edge_value = get_be32(commit_data + g->hash_len + 4); | |
429 | if (edge_value == GRAPH_PARENT_NONE) | |
430 | return 1; | |
5af7417b | 431 | if (!(edge_value & GRAPH_EXTRA_EDGES_NEEDED)) { |
4f542b7a | 432 | pptr = insert_parent_or_die(r, g, edge_value, pptr); |
177722b3 DS |
433 | return 1; |
434 | } | |
435 | ||
5af7417b | 436 | parent_data_ptr = (uint32_t*)(g->chunk_extra_edges + |
177722b3 DS |
437 | 4 * (uint64_t)(edge_value & GRAPH_EDGE_LAST_MASK)); |
438 | do { | |
439 | edge_value = get_be32(parent_data_ptr); | |
4f542b7a | 440 | pptr = insert_parent_or_die(r, g, |
177722b3 DS |
441 | edge_value & GRAPH_EDGE_LAST_MASK, |
442 | pptr); | |
443 | parent_data_ptr++; | |
444 | } while (!(edge_value & GRAPH_LAST_EDGE)); | |
445 | ||
446 | return 1; | |
447 | } | |
448 | ||
e2838d85 DS |
449 | static int find_commit_in_graph(struct commit *item, struct commit_graph *g, uint32_t *pos) |
450 | { | |
451 | if (item->graph_pos != COMMIT_NOT_FROM_GRAPH) { | |
452 | *pos = item->graph_pos; | |
453 | return 1; | |
454 | } else { | |
455 | return bsearch_graph(g, &(item->object.oid), pos); | |
456 | } | |
457 | } | |
458 | ||
4f542b7a SB |
459 | static int parse_commit_in_graph_one(struct repository *r, |
460 | struct commit_graph *g, | |
461 | struct commit *item) | |
177722b3 | 462 | { |
e2838d85 DS |
463 | uint32_t pos; |
464 | ||
177722b3 DS |
465 | if (item->object.parsed) |
466 | return 1; | |
ee797053 DS |
467 | |
468 | if (find_commit_in_graph(item, g, &pos)) | |
4f542b7a | 469 | return fill_commit_in_graph(r, item, g, pos); |
ee797053 DS |
470 | |
471 | return 0; | |
472 | } | |
473 | ||
dade47c0 | 474 | int parse_commit_in_graph(struct repository *r, struct commit *item) |
ee797053 | 475 | { |
dade47c0 | 476 | if (!prepare_commit_graph(r)) |
ee797053 | 477 | return 0; |
4f542b7a | 478 | return parse_commit_in_graph_one(r, r->objects->commit_graph, item); |
177722b3 DS |
479 | } |
480 | ||
dade47c0 | 481 | void load_commit_graph_info(struct repository *r, struct commit *item) |
e2838d85 DS |
482 | { |
483 | uint32_t pos; | |
dade47c0 | 484 | if (!prepare_commit_graph(r)) |
e2838d85 | 485 | return; |
dade47c0 JT |
486 | if (find_commit_in_graph(item, r->objects->commit_graph, &pos)) |
487 | fill_commit_graph_info(item, r->objects->commit_graph, pos); | |
e2838d85 DS |
488 | } |
489 | ||
4f542b7a SB |
490 | static struct tree *load_tree_for_commit(struct repository *r, |
491 | struct commit_graph *g, | |
492 | struct commit *c) | |
7b8a21db DS |
493 | { |
494 | struct object_id oid; | |
495 | const unsigned char *commit_data = g->chunk_commit_data + | |
496 | GRAPH_DATA_WIDTH * (c->graph_pos); | |
497 | ||
498 | hashcpy(oid.hash, commit_data); | |
4f542b7a | 499 | c->maybe_tree = lookup_tree(r, &oid); |
7b8a21db DS |
500 | |
501 | return c->maybe_tree; | |
502 | } | |
503 | ||
4f542b7a SB |
504 | static struct tree *get_commit_tree_in_graph_one(struct repository *r, |
505 | struct commit_graph *g, | |
0cbef8f8 | 506 | const struct commit *c) |
7b8a21db DS |
507 | { |
508 | if (c->maybe_tree) | |
509 | return c->maybe_tree; | |
510 | if (c->graph_pos == COMMIT_NOT_FROM_GRAPH) | |
0cbef8f8 DS |
511 | BUG("get_commit_tree_in_graph_one called from non-commit-graph commit"); |
512 | ||
4f542b7a | 513 | return load_tree_for_commit(r, g, (struct commit *)c); |
0cbef8f8 | 514 | } |
7b8a21db | 515 | |
dade47c0 | 516 | struct tree *get_commit_tree_in_graph(struct repository *r, const struct commit *c) |
0cbef8f8 | 517 | { |
4f542b7a | 518 | return get_commit_tree_in_graph_one(r, r->objects->commit_graph, c); |
7b8a21db DS |
519 | } |
520 | ||
c9905bea DS |
521 | struct packed_commit_list { |
522 | struct commit **list; | |
523 | int nr; | |
524 | int alloc; | |
525 | }; | |
526 | ||
527 | struct packed_oid_list { | |
528 | struct object_id *list; | |
529 | int nr; | |
530 | int alloc; | |
531 | }; | |
532 | ||
533 | struct write_commit_graph_context { | |
534 | struct repository *r; | |
535 | const char *obj_dir; | |
536 | char *graph_name; | |
537 | struct packed_oid_list oids; | |
538 | struct packed_commit_list commits; | |
539 | int num_extra_edges; | |
540 | unsigned long approx_nr_objects; | |
541 | struct progress *progress; | |
542 | int progress_done; | |
543 | uint64_t progress_cnt; | |
544 | unsigned append:1, | |
545 | report_progress:1; | |
546 | }; | |
547 | ||
08fd81c9 | 548 | static void write_graph_chunk_fanout(struct hashfile *f, |
c9905bea | 549 | struct write_commit_graph_context *ctx) |
08fd81c9 DS |
550 | { |
551 | int i, count = 0; | |
c9905bea | 552 | struct commit **list = ctx->commits.list; |
08fd81c9 DS |
553 | |
554 | /* | |
555 | * Write the first-level table (the list is sorted, | |
556 | * but we use a 256-entry lookup to be able to avoid | |
557 | * having to do eight extra binary search iterations). | |
558 | */ | |
559 | for (i = 0; i < 256; i++) { | |
c9905bea | 560 | while (count < ctx->commits.nr) { |
08fd81c9 DS |
561 | if ((*list)->object.oid.hash[0] != i) |
562 | break; | |
c9905bea | 563 | display_progress(ctx->progress, ++ctx->progress_cnt); |
08fd81c9 DS |
564 | count++; |
565 | list++; | |
566 | } | |
567 | ||
568 | hashwrite_be32(f, count); | |
569 | } | |
570 | } | |
571 | ||
572 | static void write_graph_chunk_oids(struct hashfile *f, int hash_len, | |
c9905bea | 573 | struct write_commit_graph_context *ctx) |
08fd81c9 | 574 | { |
c9905bea | 575 | struct commit **list = ctx->commits.list; |
08fd81c9 | 576 | int count; |
c9905bea DS |
577 | for (count = 0; count < ctx->commits.nr; count++, list++) { |
578 | display_progress(ctx->progress, ++ctx->progress_cnt); | |
08fd81c9 | 579 | hashwrite(f, (*list)->object.oid.hash, (int)hash_len); |
53035c4f | 580 | } |
08fd81c9 DS |
581 | } |
582 | ||
583 | static const unsigned char *commit_to_sha1(size_t index, void *table) | |
584 | { | |
585 | struct commit **commits = table; | |
586 | return commits[index]->object.oid.hash; | |
587 | } | |
588 | ||
589 | static void write_graph_chunk_data(struct hashfile *f, int hash_len, | |
c9905bea | 590 | struct write_commit_graph_context *ctx) |
08fd81c9 | 591 | { |
c9905bea DS |
592 | struct commit **list = ctx->commits.list; |
593 | struct commit **last = ctx->commits.list + ctx->commits.nr; | |
08fd81c9 DS |
594 | uint32_t num_extra_edges = 0; |
595 | ||
596 | while (list < last) { | |
597 | struct commit_list *parent; | |
598 | int edge_value; | |
599 | uint32_t packedDate[2]; | |
c9905bea | 600 | display_progress(ctx->progress, ++ctx->progress_cnt); |
08fd81c9 | 601 | |
43d35618 | 602 | parse_commit_no_graph(*list); |
2e27bd77 | 603 | hashwrite(f, get_commit_tree_oid(*list)->hash, hash_len); |
08fd81c9 DS |
604 | |
605 | parent = (*list)->parents; | |
606 | ||
607 | if (!parent) | |
608 | edge_value = GRAPH_PARENT_NONE; | |
609 | else { | |
610 | edge_value = sha1_pos(parent->item->object.oid.hash, | |
c9905bea DS |
611 | ctx->commits.list, |
612 | ctx->commits.nr, | |
08fd81c9 DS |
613 | commit_to_sha1); |
614 | ||
615 | if (edge_value < 0) | |
cce99cd8 DS |
616 | BUG("missing parent %s for commit %s", |
617 | oid_to_hex(&parent->item->object.oid), | |
618 | oid_to_hex(&(*list)->object.oid)); | |
08fd81c9 DS |
619 | } |
620 | ||
621 | hashwrite_be32(f, edge_value); | |
622 | ||
623 | if (parent) | |
624 | parent = parent->next; | |
625 | ||
626 | if (!parent) | |
627 | edge_value = GRAPH_PARENT_NONE; | |
628 | else if (parent->next) | |
5af7417b | 629 | edge_value = GRAPH_EXTRA_EDGES_NEEDED | num_extra_edges; |
08fd81c9 DS |
630 | else { |
631 | edge_value = sha1_pos(parent->item->object.oid.hash, | |
c9905bea DS |
632 | ctx->commits.list, |
633 | ctx->commits.nr, | |
08fd81c9 DS |
634 | commit_to_sha1); |
635 | if (edge_value < 0) | |
cce99cd8 DS |
636 | BUG("missing parent %s for commit %s", |
637 | oid_to_hex(&parent->item->object.oid), | |
638 | oid_to_hex(&(*list)->object.oid)); | |
08fd81c9 DS |
639 | } |
640 | ||
641 | hashwrite_be32(f, edge_value); | |
642 | ||
5af7417b | 643 | if (edge_value & GRAPH_EXTRA_EDGES_NEEDED) { |
08fd81c9 DS |
644 | do { |
645 | num_extra_edges++; | |
646 | parent = parent->next; | |
647 | } while (parent); | |
648 | } | |
649 | ||
650 | if (sizeof((*list)->date) > 4) | |
651 | packedDate[0] = htonl(((*list)->date >> 32) & 0x3); | |
652 | else | |
653 | packedDate[0] = 0; | |
654 | ||
3258c663 DS |
655 | packedDate[0] |= htonl((*list)->generation << 2); |
656 | ||
08fd81c9 DS |
657 | packedDate[1] = htonl((*list)->date); |
658 | hashwrite(f, packedDate, 8); | |
659 | ||
660 | list++; | |
661 | } | |
662 | } | |
663 | ||
5af7417b | 664 | static void write_graph_chunk_extra_edges(struct hashfile *f, |
c9905bea | 665 | struct write_commit_graph_context *ctx) |
08fd81c9 | 666 | { |
c9905bea DS |
667 | struct commit **list = ctx->commits.list; |
668 | struct commit **last = ctx->commits.list + ctx->commits.nr; | |
08fd81c9 DS |
669 | struct commit_list *parent; |
670 | ||
671 | while (list < last) { | |
672 | int num_parents = 0; | |
53035c4f | 673 | |
c9905bea | 674 | display_progress(ctx->progress, ++ctx->progress_cnt); |
53035c4f | 675 | |
08fd81c9 DS |
676 | for (parent = (*list)->parents; num_parents < 3 && parent; |
677 | parent = parent->next) | |
678 | num_parents++; | |
679 | ||
680 | if (num_parents <= 2) { | |
681 | list++; | |
682 | continue; | |
683 | } | |
684 | ||
685 | /* Since num_parents > 2, this initializer is safe. */ | |
686 | for (parent = (*list)->parents->next; parent; parent = parent->next) { | |
687 | int edge_value = sha1_pos(parent->item->object.oid.hash, | |
c9905bea DS |
688 | ctx->commits.list, |
689 | ctx->commits.nr, | |
08fd81c9 DS |
690 | commit_to_sha1); |
691 | ||
692 | if (edge_value < 0) | |
cce99cd8 DS |
693 | BUG("missing parent %s for commit %s", |
694 | oid_to_hex(&parent->item->object.oid), | |
695 | oid_to_hex(&(*list)->object.oid)); | |
08fd81c9 DS |
696 | else if (!parent->next) |
697 | edge_value |= GRAPH_LAST_EDGE; | |
698 | ||
699 | hashwrite_be32(f, edge_value); | |
700 | } | |
701 | ||
702 | list++; | |
703 | } | |
704 | } | |
705 | ||
706 | static int commit_compare(const void *_a, const void *_b) | |
707 | { | |
708 | const struct object_id *a = (const struct object_id *)_a; | |
709 | const struct object_id *b = (const struct object_id *)_b; | |
710 | return oidcmp(a, b); | |
711 | } | |
712 | ||
08fd81c9 DS |
713 | static int add_packed_commits(const struct object_id *oid, |
714 | struct packed_git *pack, | |
715 | uint32_t pos, | |
716 | void *data) | |
717 | { | |
c9905bea | 718 | struct write_commit_graph_context *ctx = (struct write_commit_graph_context*)data; |
08fd81c9 DS |
719 | enum object_type type; |
720 | off_t offset = nth_packed_object_offset(pack, pos); | |
721 | struct object_info oi = OBJECT_INFO_INIT; | |
722 | ||
c9905bea DS |
723 | if (ctx->progress) |
724 | display_progress(ctx->progress, ++ctx->progress_done); | |
7b0f2292 | 725 | |
08fd81c9 | 726 | oi.typep = &type; |
c9905bea | 727 | if (packed_object_info(ctx->r, pack, offset, &oi) < 0) |
4f5b532d | 728 | die(_("unable to get type of object %s"), oid_to_hex(oid)); |
08fd81c9 DS |
729 | |
730 | if (type != OBJ_COMMIT) | |
731 | return 0; | |
732 | ||
c9905bea DS |
733 | ALLOC_GROW(ctx->oids.list, ctx->oids.nr + 1, ctx->oids.alloc); |
734 | oidcpy(&(ctx->oids.list[ctx->oids.nr]), oid); | |
735 | ctx->oids.nr++; | |
08fd81c9 DS |
736 | |
737 | return 0; | |
738 | } | |
739 | ||
c9905bea | 740 | static void add_missing_parents(struct write_commit_graph_context *ctx, struct commit *commit) |
4f2542b4 DS |
741 | { |
742 | struct commit_list *parent; | |
743 | for (parent = commit->parents; parent; parent = parent->next) { | |
744 | if (!(parent->item->object.flags & UNINTERESTING)) { | |
c9905bea DS |
745 | ALLOC_GROW(ctx->oids.list, ctx->oids.nr + 1, ctx->oids.alloc); |
746 | oidcpy(&ctx->oids.list[ctx->oids.nr], &(parent->item->object.oid)); | |
747 | ctx->oids.nr++; | |
4f2542b4 DS |
748 | parent->item->object.flags |= UNINTERESTING; |
749 | } | |
750 | } | |
751 | } | |
752 | ||
c9905bea | 753 | static void close_reachable(struct write_commit_graph_context *ctx) |
4f2542b4 | 754 | { |
49bbc57a | 755 | int i; |
4f2542b4 DS |
756 | struct commit *commit; |
757 | ||
c9905bea DS |
758 | if (ctx->report_progress) |
759 | ctx->progress = start_delayed_progress( | |
760 | _("Loading known commits in commit graph"), | |
761 | ctx->oids.nr); | |
762 | for (i = 0; i < ctx->oids.nr; i++) { | |
763 | display_progress(ctx->progress, i + 1); | |
764 | commit = lookup_commit(ctx->r, &ctx->oids.list[i]); | |
4f2542b4 DS |
765 | if (commit) |
766 | commit->object.flags |= UNINTERESTING; | |
767 | } | |
c9905bea | 768 | stop_progress(&ctx->progress); |
4f2542b4 DS |
769 | |
770 | /* | |
c9905bea | 771 | * As this loop runs, ctx->oids.nr may grow, but not more |
4f2542b4 DS |
772 | * than the number of missing commits in the reachable |
773 | * closure. | |
774 | */ | |
c9905bea DS |
775 | if (ctx->report_progress) |
776 | ctx->progress = start_delayed_progress( | |
777 | _("Expanding reachable commits in commit graph"), | |
778 | ctx->oids.nr); | |
779 | for (i = 0; i < ctx->oids.nr; i++) { | |
780 | display_progress(ctx->progress, i + 1); | |
781 | commit = lookup_commit(ctx->r, &ctx->oids.list[i]); | |
4f2542b4 | 782 | |
43d35618 | 783 | if (commit && !parse_commit_no_graph(commit)) |
c9905bea | 784 | add_missing_parents(ctx, commit); |
4f2542b4 | 785 | } |
c9905bea | 786 | stop_progress(&ctx->progress); |
4f2542b4 | 787 | |
c9905bea DS |
788 | if (ctx->report_progress) |
789 | ctx->progress = start_delayed_progress( | |
790 | _("Clearing commit marks in commit graph"), | |
791 | ctx->oids.nr); | |
792 | for (i = 0; i < ctx->oids.nr; i++) { | |
793 | display_progress(ctx->progress, i + 1); | |
794 | commit = lookup_commit(ctx->r, &ctx->oids.list[i]); | |
4f2542b4 DS |
795 | |
796 | if (commit) | |
797 | commit->object.flags &= ~UNINTERESTING; | |
798 | } | |
c9905bea | 799 | stop_progress(&ctx->progress); |
4f2542b4 DS |
800 | } |
801 | ||
c9905bea | 802 | static void compute_generation_numbers(struct write_commit_graph_context *ctx) |
3258c663 DS |
803 | { |
804 | int i; | |
805 | struct commit_list *list = NULL; | |
806 | ||
c9905bea DS |
807 | if (ctx->report_progress) |
808 | ctx->progress = start_progress( | |
809 | _("Computing commit graph generation numbers"), | |
810 | ctx->commits.nr); | |
811 | for (i = 0; i < ctx->commits.nr; i++) { | |
812 | display_progress(ctx->progress, i + 1); | |
813 | if (ctx->commits.list[i]->generation != GENERATION_NUMBER_INFINITY && | |
814 | ctx->commits.list[i]->generation != GENERATION_NUMBER_ZERO) | |
3258c663 DS |
815 | continue; |
816 | ||
c9905bea | 817 | commit_list_insert(ctx->commits.list[i], &list); |
3258c663 DS |
818 | while (list) { |
819 | struct commit *current = list->item; | |
820 | struct commit_list *parent; | |
821 | int all_parents_computed = 1; | |
822 | uint32_t max_generation = 0; | |
823 | ||
824 | for (parent = current->parents; parent; parent = parent->next) { | |
825 | if (parent->item->generation == GENERATION_NUMBER_INFINITY || | |
826 | parent->item->generation == GENERATION_NUMBER_ZERO) { | |
827 | all_parents_computed = 0; | |
828 | commit_list_insert(parent->item, &list); | |
829 | break; | |
830 | } else if (parent->item->generation > max_generation) { | |
831 | max_generation = parent->item->generation; | |
832 | } | |
833 | } | |
834 | ||
835 | if (all_parents_computed) { | |
836 | current->generation = max_generation + 1; | |
837 | pop_commit(&list); | |
838 | ||
839 | if (current->generation > GENERATION_NUMBER_MAX) | |
840 | current->generation = GENERATION_NUMBER_MAX; | |
841 | } | |
842 | } | |
843 | } | |
c9905bea | 844 | stop_progress(&ctx->progress); |
3258c663 DS |
845 | } |
846 | ||
59fb8770 DS |
847 | static int add_ref_to_list(const char *refname, |
848 | const struct object_id *oid, | |
849 | int flags, void *cb_data) | |
850 | { | |
851 | struct string_list *list = (struct string_list *)cb_data; | |
852 | ||
853 | string_list_append(list, oid_to_hex(oid)); | |
854 | return 0; | |
855 | } | |
856 | ||
5af80394 | 857 | int write_commit_graph_reachable(const char *obj_dir, unsigned int flags) |
59fb8770 | 858 | { |
f4dbdfc4 | 859 | struct string_list list = STRING_LIST_INIT_DUP; |
e103f727 | 860 | int result; |
59fb8770 | 861 | |
59fb8770 | 862 | for_each_ref(add_ref_to_list, &list); |
e103f727 | 863 | result = write_commit_graph(obj_dir, NULL, &list, |
5af80394 | 864 | flags); |
f4dbdfc4 DS |
865 | |
866 | string_list_clear(&list, 0); | |
e103f727 | 867 | return result; |
59fb8770 DS |
868 | } |
869 | ||
ef5b83f2 DS |
870 | static int fill_oids_from_packs(struct write_commit_graph_context *ctx, |
871 | struct string_list *pack_indexes) | |
872 | { | |
873 | uint32_t i; | |
874 | struct strbuf progress_title = STRBUF_INIT; | |
875 | struct strbuf packname = STRBUF_INIT; | |
876 | int dirlen; | |
877 | ||
878 | strbuf_addf(&packname, "%s/pack/", ctx->obj_dir); | |
879 | dirlen = packname.len; | |
880 | if (ctx->report_progress) { | |
881 | strbuf_addf(&progress_title, | |
882 | Q_("Finding commits for commit graph in %d pack", | |
883 | "Finding commits for commit graph in %d packs", | |
884 | pack_indexes->nr), | |
885 | pack_indexes->nr); | |
886 | ctx->progress = start_delayed_progress(progress_title.buf, 0); | |
887 | ctx->progress_done = 0; | |
888 | } | |
889 | for (i = 0; i < pack_indexes->nr; i++) { | |
890 | struct packed_git *p; | |
891 | strbuf_setlen(&packname, dirlen); | |
892 | strbuf_addstr(&packname, pack_indexes->items[i].string); | |
893 | p = add_packed_git(packname.buf, packname.len, 1); | |
894 | if (!p) { | |
895 | error(_("error adding pack %s"), packname.buf); | |
896 | return -1; | |
897 | } | |
898 | if (open_pack_index(p)) { | |
899 | error(_("error opening index for %s"), packname.buf); | |
900 | return -1; | |
901 | } | |
902 | for_each_object_in_pack(p, add_packed_commits, ctx, | |
903 | FOR_EACH_OBJECT_PACK_ORDER); | |
904 | close_pack(p); | |
905 | free(p); | |
906 | } | |
907 | ||
908 | stop_progress(&ctx->progress); | |
909 | strbuf_reset(&progress_title); | |
910 | strbuf_release(&packname); | |
911 | ||
912 | return 0; | |
913 | } | |
914 | ||
4c9efe85 DS |
915 | static void fill_oids_from_commit_hex(struct write_commit_graph_context *ctx, |
916 | struct string_list *commit_hex) | |
917 | { | |
918 | uint32_t i; | |
919 | struct strbuf progress_title = STRBUF_INIT; | |
920 | ||
921 | if (ctx->report_progress) { | |
922 | strbuf_addf(&progress_title, | |
923 | Q_("Finding commits for commit graph from %d ref", | |
924 | "Finding commits for commit graph from %d refs", | |
925 | commit_hex->nr), | |
926 | commit_hex->nr); | |
927 | ctx->progress = start_delayed_progress( | |
928 | progress_title.buf, | |
929 | commit_hex->nr); | |
930 | } | |
931 | for (i = 0; i < commit_hex->nr; i++) { | |
932 | const char *end; | |
933 | struct object_id oid; | |
934 | struct commit *result; | |
935 | ||
936 | display_progress(ctx->progress, i + 1); | |
937 | if (commit_hex->items[i].string && | |
938 | parse_oid_hex(commit_hex->items[i].string, &oid, &end)) | |
939 | continue; | |
940 | ||
941 | result = lookup_commit_reference_gently(ctx->r, &oid, 1); | |
942 | ||
943 | if (result) { | |
944 | ALLOC_GROW(ctx->oids.list, ctx->oids.nr + 1, ctx->oids.alloc); | |
945 | oidcpy(&ctx->oids.list[ctx->oids.nr], &(result->object.oid)); | |
946 | ctx->oids.nr++; | |
947 | } | |
948 | } | |
949 | stop_progress(&ctx->progress); | |
950 | strbuf_release(&progress_title); | |
951 | } | |
952 | ||
b2c83060 DS |
953 | static void fill_oids_from_all_packs(struct write_commit_graph_context *ctx) |
954 | { | |
955 | if (ctx->report_progress) | |
956 | ctx->progress = start_delayed_progress( | |
957 | _("Finding commits for commit graph among packed objects"), | |
958 | ctx->approx_nr_objects); | |
959 | for_each_packed_object(add_packed_commits, ctx, | |
960 | FOR_EACH_OBJECT_PACK_ORDER); | |
961 | if (ctx->progress_done < ctx->approx_nr_objects) | |
962 | display_progress(ctx->progress, ctx->approx_nr_objects); | |
963 | stop_progress(&ctx->progress); | |
964 | } | |
965 | ||
014e3440 DS |
966 | static uint32_t count_distinct_commits(struct write_commit_graph_context *ctx) |
967 | { | |
968 | uint32_t i, count_distinct = 1; | |
969 | ||
970 | if (ctx->report_progress) | |
971 | ctx->progress = start_delayed_progress( | |
972 | _("Counting distinct commits in commit graph"), | |
973 | ctx->oids.nr); | |
974 | display_progress(ctx->progress, 0); /* TODO: Measure QSORT() progress */ | |
975 | QSORT(ctx->oids.list, ctx->oids.nr, commit_compare); | |
976 | ||
977 | for (i = 1; i < ctx->oids.nr; i++) { | |
978 | display_progress(ctx->progress, i + 1); | |
979 | if (!oideq(&ctx->oids.list[i - 1], &ctx->oids.list[i])) | |
980 | count_distinct++; | |
981 | } | |
982 | stop_progress(&ctx->progress); | |
983 | ||
984 | return count_distinct; | |
985 | } | |
986 | ||
f998d542 DS |
987 | static void copy_oids_to_commits(struct write_commit_graph_context *ctx) |
988 | { | |
989 | uint32_t i; | |
990 | struct commit_list *parent; | |
991 | ||
992 | ctx->num_extra_edges = 0; | |
993 | if (ctx->report_progress) | |
994 | ctx->progress = start_delayed_progress( | |
995 | _("Finding extra edges in commit graph"), | |
996 | ctx->oids.nr); | |
997 | for (i = 0; i < ctx->oids.nr; i++) { | |
998 | int num_parents = 0; | |
999 | display_progress(ctx->progress, i + 1); | |
1000 | if (i > 0 && oideq(&ctx->oids.list[i - 1], &ctx->oids.list[i])) | |
1001 | continue; | |
1002 | ||
1003 | ctx->commits.list[ctx->commits.nr] = lookup_commit(ctx->r, &ctx->oids.list[i]); | |
1004 | parse_commit_no_graph(ctx->commits.list[ctx->commits.nr]); | |
1005 | ||
1006 | for (parent = ctx->commits.list[ctx->commits.nr]->parents; | |
1007 | parent; parent = parent->next) | |
1008 | num_parents++; | |
1009 | ||
1010 | if (num_parents > 2) | |
1011 | ctx->num_extra_edges += num_parents - 1; | |
1012 | ||
1013 | ctx->commits.nr++; | |
1014 | } | |
1015 | stop_progress(&ctx->progress); | |
1016 | } | |
1017 | ||
238def57 | 1018 | static int write_commit_graph_file(struct write_commit_graph_context *ctx) |
08fd81c9 | 1019 | { |
238def57 | 1020 | uint32_t i; |
08fd81c9 | 1021 | struct hashfile *f; |
08fd81c9 DS |
1022 | struct lock_file lk = LOCK_INIT; |
1023 | uint32_t chunk_ids[5]; | |
1024 | uint64_t chunk_offsets[5]; | |
c1665998 | 1025 | const unsigned hashsz = the_hash_algo->rawsz; |
28944739 | 1026 | struct strbuf progress_title = STRBUF_INIT; |
238def57 DS |
1027 | int num_chunks = ctx->num_extra_edges ? 4 : 3; |
1028 | ||
1029 | ctx->graph_name = get_commit_graph_filename(ctx->obj_dir); | |
1030 | if (safe_create_leading_directories(ctx->graph_name)) { | |
1031 | UNLEAK(ctx->graph_name); | |
1032 | error(_("unable to create leading directories of %s"), | |
1033 | ctx->graph_name); | |
1034 | return -1; | |
1035 | } | |
1036 | ||
1037 | hold_lock_file_for_update(&lk, ctx->graph_name, LOCK_DIE_ON_ERROR); | |
1038 | f = hashfd(lk.tempfile->fd, lk.tempfile->filename.buf); | |
1039 | ||
1040 | hashwrite_be32(f, GRAPH_SIGNATURE); | |
1041 | ||
1042 | hashwrite_u8(f, GRAPH_VERSION); | |
1043 | hashwrite_u8(f, oid_version()); | |
1044 | hashwrite_u8(f, num_chunks); | |
1045 | hashwrite_u8(f, 0); /* unused padding byte */ | |
1046 | ||
1047 | chunk_ids[0] = GRAPH_CHUNKID_OIDFANOUT; | |
1048 | chunk_ids[1] = GRAPH_CHUNKID_OIDLOOKUP; | |
1049 | chunk_ids[2] = GRAPH_CHUNKID_DATA; | |
1050 | if (ctx->num_extra_edges) | |
1051 | chunk_ids[3] = GRAPH_CHUNKID_EXTRAEDGES; | |
1052 | else | |
1053 | chunk_ids[3] = 0; | |
1054 | chunk_ids[4] = 0; | |
1055 | ||
1056 | chunk_offsets[0] = 8 + (num_chunks + 1) * GRAPH_CHUNKLOOKUP_WIDTH; | |
1057 | chunk_offsets[1] = chunk_offsets[0] + GRAPH_FANOUT_SIZE; | |
1058 | chunk_offsets[2] = chunk_offsets[1] + hashsz * ctx->commits.nr; | |
1059 | chunk_offsets[3] = chunk_offsets[2] + (hashsz + 16) * ctx->commits.nr; | |
1060 | chunk_offsets[4] = chunk_offsets[3] + 4 * ctx->num_extra_edges; | |
1061 | ||
1062 | for (i = 0; i <= num_chunks; i++) { | |
1063 | uint32_t chunk_write[3]; | |
1064 | ||
1065 | chunk_write[0] = htonl(chunk_ids[i]); | |
1066 | chunk_write[1] = htonl(chunk_offsets[i] >> 32); | |
1067 | chunk_write[2] = htonl(chunk_offsets[i] & 0xffffffff); | |
1068 | hashwrite(f, chunk_write, 12); | |
1069 | } | |
1070 | ||
1071 | if (ctx->report_progress) { | |
1072 | strbuf_addf(&progress_title, | |
1073 | Q_("Writing out commit graph in %d pass", | |
1074 | "Writing out commit graph in %d passes", | |
1075 | num_chunks), | |
1076 | num_chunks); | |
1077 | ctx->progress = start_delayed_progress( | |
1078 | progress_title.buf, | |
1079 | num_chunks * ctx->commits.nr); | |
1080 | } | |
1081 | write_graph_chunk_fanout(f, ctx); | |
1082 | write_graph_chunk_oids(f, hashsz, ctx); | |
1083 | write_graph_chunk_data(f, hashsz, ctx); | |
1084 | if (ctx->num_extra_edges) | |
1085 | write_graph_chunk_extra_edges(f, ctx); | |
1086 | stop_progress(&ctx->progress); | |
1087 | strbuf_release(&progress_title); | |
1088 | ||
1089 | close_commit_graph(ctx->r); | |
1090 | finalize_hashfile(f, NULL, CSUM_HASH_IN_STREAM | CSUM_FSYNC); | |
1091 | commit_lock_file(&lk); | |
1092 | ||
1093 | return 0; | |
1094 | } | |
1095 | ||
1096 | int write_commit_graph(const char *obj_dir, | |
1097 | struct string_list *pack_indexes, | |
1098 | struct string_list *commit_hex, | |
1099 | unsigned int flags) | |
1100 | { | |
1101 | struct write_commit_graph_context *ctx; | |
1102 | uint32_t i, count_distinct = 0; | |
e103f727 | 1103 | int res = 0; |
08fd81c9 | 1104 | |
d6538246 | 1105 | if (!commit_graph_compatible(the_repository)) |
e103f727 | 1106 | return 0; |
d6538246 | 1107 | |
c9905bea DS |
1108 | ctx = xcalloc(1, sizeof(struct write_commit_graph_context)); |
1109 | ctx->r = the_repository; | |
1110 | ctx->obj_dir = obj_dir; | |
1111 | ctx->append = flags & COMMIT_GRAPH_APPEND ? 1 : 0; | |
1112 | ctx->report_progress = flags & COMMIT_GRAPH_PROGRESS ? 1 : 0; | |
1113 | ||
1114 | ctx->approx_nr_objects = approximate_object_count(); | |
1115 | ctx->oids.alloc = ctx->approx_nr_objects / 32; | |
1116 | ||
1117 | if (ctx->append) { | |
1118 | prepare_commit_graph_one(ctx->r, ctx->obj_dir); | |
1119 | if (ctx->r->objects->commit_graph) | |
1120 | ctx->oids.alloc += ctx->r->objects->commit_graph->num_commits; | |
7547b95b DS |
1121 | } |
1122 | ||
c9905bea DS |
1123 | if (ctx->oids.alloc < 1024) |
1124 | ctx->oids.alloc = 1024; | |
1125 | ALLOC_ARRAY(ctx->oids.list, ctx->oids.alloc); | |
1126 | ||
1127 | if (ctx->append && ctx->r->objects->commit_graph) { | |
1128 | struct commit_graph *g = ctx->r->objects->commit_graph; | |
1129 | for (i = 0; i < g->num_commits; i++) { | |
1130 | const unsigned char *hash = g->chunk_oid_lookup + g->hash_len * i; | |
1131 | hashcpy(ctx->oids.list[ctx->oids.nr++].hash, hash); | |
7547b95b DS |
1132 | } |
1133 | } | |
1134 | ||
049d51a2 | 1135 | if (pack_indexes) { |
ef5b83f2 DS |
1136 | if ((res = fill_oids_from_packs(ctx, pack_indexes))) |
1137 | goto cleanup; | |
3d5df01b DS |
1138 | } |
1139 | ||
4c9efe85 DS |
1140 | if (commit_hex) |
1141 | fill_oids_from_commit_hex(ctx, commit_hex); | |
3d5df01b | 1142 | |
b2c83060 DS |
1143 | if (!pack_indexes && !commit_hex) |
1144 | fill_oids_from_all_packs(ctx); | |
049d51a2 | 1145 | |
c9905bea | 1146 | close_reachable(ctx); |
08fd81c9 | 1147 | |
014e3440 | 1148 | count_distinct = count_distinct_commits(ctx); |
08fd81c9 | 1149 | |
e103f727 DS |
1150 | if (count_distinct >= GRAPH_EDGE_LAST_MASK) { |
1151 | error(_("the commit graph format cannot write %d commits"), count_distinct); | |
1152 | res = -1; | |
1153 | goto cleanup; | |
1154 | } | |
08fd81c9 | 1155 | |
c9905bea DS |
1156 | ctx->commits.alloc = count_distinct; |
1157 | ALLOC_ARRAY(ctx->commits.list, ctx->commits.alloc); | |
08fd81c9 | 1158 | |
f998d542 | 1159 | copy_oids_to_commits(ctx); |
08fd81c9 | 1160 | |
c9905bea | 1161 | if (ctx->commits.nr >= GRAPH_EDGE_LAST_MASK) { |
e103f727 DS |
1162 | error(_("too many commits to write graph")); |
1163 | res = -1; | |
1164 | goto cleanup; | |
1165 | } | |
08fd81c9 | 1166 | |
c9905bea | 1167 | compute_generation_numbers(ctx); |
08fd81c9 | 1168 | |
238def57 | 1169 | res = write_commit_graph_file(ctx); |
08fd81c9 | 1170 | |
e103f727 | 1171 | cleanup: |
238def57 | 1172 | free(ctx->graph_name); |
c9905bea DS |
1173 | free(ctx->commits.list); |
1174 | free(ctx->oids.list); | |
1175 | free(ctx); | |
e103f727 DS |
1176 | |
1177 | return res; | |
08fd81c9 | 1178 | } |
283e68c7 | 1179 | |
41df0e30 | 1180 | #define VERIFY_COMMIT_GRAPH_ERROR_HASH 2 |
283e68c7 DS |
1181 | static int verify_commit_graph_error; |
1182 | ||
1183 | static void graph_report(const char *fmt, ...) | |
1184 | { | |
1185 | va_list ap; | |
1186 | ||
1187 | verify_commit_graph_error = 1; | |
1188 | va_start(ap, fmt); | |
1189 | vfprintf(stderr, fmt, ap); | |
1190 | fprintf(stderr, "\n"); | |
1191 | va_end(ap); | |
1192 | } | |
1193 | ||
1373e547 DS |
1194 | #define GENERATION_ZERO_EXISTS 1 |
1195 | #define GENERATION_NUMBER_EXISTS 2 | |
1196 | ||
283e68c7 DS |
1197 | int verify_commit_graph(struct repository *r, struct commit_graph *g) |
1198 | { | |
9bda8467 | 1199 | uint32_t i, cur_fanout_pos = 0; |
41df0e30 | 1200 | struct object_id prev_oid, cur_oid, checksum; |
1373e547 | 1201 | int generation_zero = 0; |
41df0e30 DS |
1202 | struct hashfile *f; |
1203 | int devnull; | |
1f7f557f | 1204 | struct progress *progress = NULL; |
9bda8467 | 1205 | |
283e68c7 DS |
1206 | if (!g) { |
1207 | graph_report("no commit-graph file loaded"); | |
1208 | return 1; | |
1209 | } | |
1210 | ||
2ac138d5 | 1211 | verify_commit_graph_error = verify_commit_graph_lite(g); |
9bda8467 DS |
1212 | if (verify_commit_graph_error) |
1213 | return verify_commit_graph_error; | |
1214 | ||
41df0e30 DS |
1215 | devnull = open("/dev/null", O_WRONLY); |
1216 | f = hashfd(devnull, NULL); | |
1217 | hashwrite(f, g->data, g->data_len - g->hash_len); | |
1218 | finalize_hashfile(f, checksum.hash, CSUM_CLOSE); | |
67947c34 | 1219 | if (!hasheq(checksum.hash, g->data + g->data_len - g->hash_len)) { |
41df0e30 DS |
1220 | graph_report(_("the commit-graph file has incorrect checksum and is likely corrupt")); |
1221 | verify_commit_graph_error = VERIFY_COMMIT_GRAPH_ERROR_HASH; | |
1222 | } | |
1223 | ||
9bda8467 | 1224 | for (i = 0; i < g->num_commits; i++) { |
2e3c0737 DS |
1225 | struct commit *graph_commit; |
1226 | ||
9bda8467 DS |
1227 | hashcpy(cur_oid.hash, g->chunk_oid_lookup + g->hash_len * i); |
1228 | ||
1229 | if (i && oidcmp(&prev_oid, &cur_oid) >= 0) | |
93b4405f | 1230 | graph_report(_("commit-graph has incorrect OID order: %s then %s"), |
9bda8467 DS |
1231 | oid_to_hex(&prev_oid), |
1232 | oid_to_hex(&cur_oid)); | |
1233 | ||
1234 | oidcpy(&prev_oid, &cur_oid); | |
1235 | ||
1236 | while (cur_oid.hash[0] > cur_fanout_pos) { | |
1237 | uint32_t fanout_value = get_be32(g->chunk_oid_fanout + cur_fanout_pos); | |
1238 | ||
1239 | if (i != fanout_value) | |
93b4405f | 1240 | graph_report(_("commit-graph has incorrect fanout value: fanout[%d] = %u != %u"), |
9bda8467 DS |
1241 | cur_fanout_pos, fanout_value, i); |
1242 | cur_fanout_pos++; | |
1243 | } | |
2e3c0737 | 1244 | |
82952964 | 1245 | graph_commit = lookup_commit(r, &cur_oid); |
4f542b7a | 1246 | if (!parse_commit_in_graph_one(r, g, graph_commit)) |
93b4405f | 1247 | graph_report(_("failed to parse commit %s from commit-graph"), |
2e3c0737 | 1248 | oid_to_hex(&cur_oid)); |
9bda8467 DS |
1249 | } |
1250 | ||
1251 | while (cur_fanout_pos < 256) { | |
1252 | uint32_t fanout_value = get_be32(g->chunk_oid_fanout + cur_fanout_pos); | |
1253 | ||
1254 | if (g->num_commits != fanout_value) | |
93b4405f | 1255 | graph_report(_("commit-graph has incorrect fanout value: fanout[%d] = %u != %u"), |
9bda8467 DS |
1256 | cur_fanout_pos, fanout_value, i); |
1257 | ||
1258 | cur_fanout_pos++; | |
1259 | } | |
1260 | ||
41df0e30 | 1261 | if (verify_commit_graph_error & ~VERIFY_COMMIT_GRAPH_ERROR_HASH) |
96af91d4 DS |
1262 | return verify_commit_graph_error; |
1263 | ||
1f7f557f ÆAB |
1264 | progress = start_progress(_("Verifying commits in commit graph"), |
1265 | g->num_commits); | |
96af91d4 | 1266 | for (i = 0; i < g->num_commits; i++) { |
2e3c0737 | 1267 | struct commit *graph_commit, *odb_commit; |
53614b13 | 1268 | struct commit_list *graph_parents, *odb_parents; |
1373e547 | 1269 | uint32_t max_generation = 0; |
96af91d4 | 1270 | |
1f7f557f | 1271 | display_progress(progress, i + 1); |
96af91d4 DS |
1272 | hashcpy(cur_oid.hash, g->chunk_oid_lookup + g->hash_len * i); |
1273 | ||
82952964 | 1274 | graph_commit = lookup_commit(r, &cur_oid); |
96af91d4 DS |
1275 | odb_commit = (struct commit *)create_object(r, cur_oid.hash, alloc_commit_node(r)); |
1276 | if (parse_commit_internal(odb_commit, 0, 0)) { | |
93b4405f | 1277 | graph_report(_("failed to parse commit %s from object database for commit-graph"), |
96af91d4 DS |
1278 | oid_to_hex(&cur_oid)); |
1279 | continue; | |
1280 | } | |
2e3c0737 | 1281 | |
4f542b7a | 1282 | if (!oideq(&get_commit_tree_in_graph_one(r, g, graph_commit)->object.oid, |
2e3c0737 | 1283 | get_commit_tree_oid(odb_commit))) |
93b4405f | 1284 | graph_report(_("root tree OID for commit %s in commit-graph is %s != %s"), |
2e3c0737 DS |
1285 | oid_to_hex(&cur_oid), |
1286 | oid_to_hex(get_commit_tree_oid(graph_commit)), | |
1287 | oid_to_hex(get_commit_tree_oid(odb_commit))); | |
53614b13 DS |
1288 | |
1289 | graph_parents = graph_commit->parents; | |
1290 | odb_parents = odb_commit->parents; | |
1291 | ||
1292 | while (graph_parents) { | |
1293 | if (odb_parents == NULL) { | |
93b4405f | 1294 | graph_report(_("commit-graph parent list for commit %s is too long"), |
53614b13 DS |
1295 | oid_to_hex(&cur_oid)); |
1296 | break; | |
1297 | } | |
1298 | ||
9001dc2a | 1299 | if (!oideq(&graph_parents->item->object.oid, &odb_parents->item->object.oid)) |
93b4405f | 1300 | graph_report(_("commit-graph parent for %s is %s != %s"), |
53614b13 DS |
1301 | oid_to_hex(&cur_oid), |
1302 | oid_to_hex(&graph_parents->item->object.oid), | |
1303 | oid_to_hex(&odb_parents->item->object.oid)); | |
1304 | ||
1373e547 DS |
1305 | if (graph_parents->item->generation > max_generation) |
1306 | max_generation = graph_parents->item->generation; | |
1307 | ||
53614b13 DS |
1308 | graph_parents = graph_parents->next; |
1309 | odb_parents = odb_parents->next; | |
1310 | } | |
1311 | ||
1312 | if (odb_parents != NULL) | |
93b4405f | 1313 | graph_report(_("commit-graph parent list for commit %s terminates early"), |
53614b13 | 1314 | oid_to_hex(&cur_oid)); |
1373e547 DS |
1315 | |
1316 | if (!graph_commit->generation) { | |
1317 | if (generation_zero == GENERATION_NUMBER_EXISTS) | |
93b4405f | 1318 | graph_report(_("commit-graph has generation number zero for commit %s, but non-zero elsewhere"), |
1373e547 DS |
1319 | oid_to_hex(&cur_oid)); |
1320 | generation_zero = GENERATION_ZERO_EXISTS; | |
1321 | } else if (generation_zero == GENERATION_ZERO_EXISTS) | |
93b4405f | 1322 | graph_report(_("commit-graph has non-zero generation number for commit %s, but zero elsewhere"), |
1373e547 DS |
1323 | oid_to_hex(&cur_oid)); |
1324 | ||
1325 | if (generation_zero == GENERATION_ZERO_EXISTS) | |
1326 | continue; | |
1327 | ||
1328 | /* | |
1329 | * If one of our parents has generation GENERATION_NUMBER_MAX, then | |
1330 | * our generation is also GENERATION_NUMBER_MAX. Decrement to avoid | |
1331 | * extra logic in the following condition. | |
1332 | */ | |
1333 | if (max_generation == GENERATION_NUMBER_MAX) | |
1334 | max_generation--; | |
1335 | ||
1336 | if (graph_commit->generation != max_generation + 1) | |
93b4405f | 1337 | graph_report(_("commit-graph generation for commit %s is %u != %u"), |
1373e547 DS |
1338 | oid_to_hex(&cur_oid), |
1339 | graph_commit->generation, | |
1340 | max_generation + 1); | |
88968ebf DS |
1341 | |
1342 | if (graph_commit->date != odb_commit->date) | |
93b4405f | 1343 | graph_report(_("commit date for commit %s in commit-graph is %"PRItime" != %"PRItime), |
88968ebf DS |
1344 | oid_to_hex(&cur_oid), |
1345 | graph_commit->date, | |
1346 | odb_commit->date); | |
96af91d4 | 1347 | } |
1f7f557f | 1348 | stop_progress(&progress); |
96af91d4 | 1349 | |
283e68c7 DS |
1350 | return verify_commit_graph_error; |
1351 | } | |
c3756d5b JT |
1352 | |
1353 | void free_commit_graph(struct commit_graph *g) | |
1354 | { | |
1355 | if (!g) | |
1356 | return; | |
1357 | if (g->graph_fd >= 0) { | |
1358 | munmap((void *)g->data, g->data_len); | |
1359 | g->data = NULL; | |
1360 | close(g->graph_fd); | |
1361 | } | |
1362 | free(g); | |
1363 | } |