]>
Commit | Line | Data |
---|---|---|
1 | #include "cache.h" | |
2 | #include "lockfile.h" | |
3 | #include "bundle.h" | |
4 | #include "object-store.h" | |
5 | #include "repository.h" | |
6 | #include "object.h" | |
7 | #include "commit.h" | |
8 | #include "diff.h" | |
9 | #include "revision.h" | |
10 | #include "list-objects.h" | |
11 | #include "run-command.h" | |
12 | #include "refs.h" | |
13 | #include "strvec.h" | |
14 | ||
15 | ||
16 | static const char v2_bundle_signature[] = "# v2 git bundle\n"; | |
17 | static const char v3_bundle_signature[] = "# v3 git bundle\n"; | |
18 | static struct { | |
19 | int version; | |
20 | const char *signature; | |
21 | } bundle_sigs[] = { | |
22 | { 2, v2_bundle_signature }, | |
23 | { 3, v3_bundle_signature }, | |
24 | }; | |
25 | ||
26 | static void add_to_ref_list(const struct object_id *oid, const char *name, | |
27 | struct ref_list *list) | |
28 | { | |
29 | ALLOC_GROW(list->list, list->nr + 1, list->alloc); | |
30 | oidcpy(&list->list[list->nr].oid, oid); | |
31 | list->list[list->nr].name = xstrdup(name); | |
32 | list->nr++; | |
33 | } | |
34 | ||
35 | static int parse_capability(struct bundle_header *header, const char *capability) | |
36 | { | |
37 | const char *arg; | |
38 | if (skip_prefix(capability, "object-format=", &arg)) { | |
39 | int algo = hash_algo_by_name(arg); | |
40 | if (algo == GIT_HASH_UNKNOWN) | |
41 | return error(_("unrecognized bundle hash algorithm: %s"), arg); | |
42 | header->hash_algo = &hash_algos[algo]; | |
43 | return 0; | |
44 | } | |
45 | return error(_("unknown capability '%s'"), capability); | |
46 | } | |
47 | ||
48 | static int parse_bundle_signature(struct bundle_header *header, const char *line) | |
49 | { | |
50 | int i; | |
51 | ||
52 | for (i = 0; i < ARRAY_SIZE(bundle_sigs); i++) { | |
53 | if (!strcmp(line, bundle_sigs[i].signature)) { | |
54 | header->version = bundle_sigs[i].version; | |
55 | return 0; | |
56 | } | |
57 | } | |
58 | return -1; | |
59 | } | |
60 | ||
61 | static int parse_bundle_header(int fd, struct bundle_header *header, | |
62 | const char *report_path) | |
63 | { | |
64 | struct strbuf buf = STRBUF_INIT; | |
65 | int status = 0; | |
66 | ||
67 | /* The bundle header begins with the signature */ | |
68 | if (strbuf_getwholeline_fd(&buf, fd, '\n') || | |
69 | parse_bundle_signature(header, buf.buf)) { | |
70 | if (report_path) | |
71 | error(_("'%s' does not look like a v2 or v3 bundle file"), | |
72 | report_path); | |
73 | status = -1; | |
74 | goto abort; | |
75 | } | |
76 | ||
77 | header->hash_algo = the_hash_algo; | |
78 | ||
79 | /* The bundle header ends with an empty line */ | |
80 | while (!strbuf_getwholeline_fd(&buf, fd, '\n') && | |
81 | buf.len && buf.buf[0] != '\n') { | |
82 | struct object_id oid; | |
83 | int is_prereq = 0; | |
84 | const char *p; | |
85 | ||
86 | strbuf_rtrim(&buf); | |
87 | ||
88 | if (header->version == 3 && *buf.buf == '@') { | |
89 | if (parse_capability(header, buf.buf + 1)) { | |
90 | status = -1; | |
91 | break; | |
92 | } | |
93 | continue; | |
94 | } | |
95 | ||
96 | if (*buf.buf == '-') { | |
97 | is_prereq = 1; | |
98 | strbuf_remove(&buf, 0, 1); | |
99 | } | |
100 | ||
101 | /* | |
102 | * Tip lines have object name, SP, and refname. | |
103 | * Prerequisites have object name that is optionally | |
104 | * followed by SP and subject line. | |
105 | */ | |
106 | if (parse_oid_hex_algop(buf.buf, &oid, &p, header->hash_algo) || | |
107 | (*p && !isspace(*p)) || | |
108 | (!is_prereq && !*p)) { | |
109 | if (report_path) | |
110 | error(_("unrecognized header: %s%s (%d)"), | |
111 | (is_prereq ? "-" : ""), buf.buf, (int)buf.len); | |
112 | status = -1; | |
113 | break; | |
114 | } else { | |
115 | if (is_prereq) | |
116 | add_to_ref_list(&oid, "", &header->prerequisites); | |
117 | else | |
118 | add_to_ref_list(&oid, p + 1, &header->references); | |
119 | } | |
120 | } | |
121 | ||
122 | abort: | |
123 | if (status) { | |
124 | close(fd); | |
125 | fd = -1; | |
126 | } | |
127 | strbuf_release(&buf); | |
128 | return fd; | |
129 | } | |
130 | ||
131 | int read_bundle_header(const char *path, struct bundle_header *header) | |
132 | { | |
133 | int fd = open(path, O_RDONLY); | |
134 | ||
135 | if (fd < 0) | |
136 | return error(_("could not open '%s'"), path); | |
137 | return parse_bundle_header(fd, header, path); | |
138 | } | |
139 | ||
140 | int is_bundle(const char *path, int quiet) | |
141 | { | |
142 | struct bundle_header header; | |
143 | int fd = open(path, O_RDONLY); | |
144 | ||
145 | if (fd < 0) | |
146 | return 0; | |
147 | memset(&header, 0, sizeof(header)); | |
148 | fd = parse_bundle_header(fd, &header, quiet ? NULL : path); | |
149 | if (fd >= 0) | |
150 | close(fd); | |
151 | return (fd >= 0); | |
152 | } | |
153 | ||
154 | static int list_refs(struct ref_list *r, int argc, const char **argv) | |
155 | { | |
156 | int i; | |
157 | ||
158 | for (i = 0; i < r->nr; i++) { | |
159 | if (argc > 1) { | |
160 | int j; | |
161 | for (j = 1; j < argc; j++) | |
162 | if (!strcmp(r->list[i].name, argv[j])) | |
163 | break; | |
164 | if (j == argc) | |
165 | continue; | |
166 | } | |
167 | printf("%s %s\n", oid_to_hex(&r->list[i].oid), | |
168 | r->list[i].name); | |
169 | } | |
170 | return 0; | |
171 | } | |
172 | ||
173 | /* Remember to update object flag allocation in object.h */ | |
174 | #define PREREQ_MARK (1u<<16) | |
175 | ||
176 | int verify_bundle(struct repository *r, | |
177 | struct bundle_header *header, | |
178 | int verbose) | |
179 | { | |
180 | /* | |
181 | * Do fast check, then if any prereqs are missing then go line by line | |
182 | * to be verbose about the errors | |
183 | */ | |
184 | struct ref_list *p = &header->prerequisites; | |
185 | struct rev_info revs; | |
186 | const char *argv[] = {NULL, "--all", NULL}; | |
187 | struct commit *commit; | |
188 | int i, ret = 0, req_nr; | |
189 | const char *message = _("Repository lacks these prerequisite commits:"); | |
190 | ||
191 | if (!r || !r->objects || !r->objects->odb) | |
192 | return error(_("need a repository to verify a bundle")); | |
193 | ||
194 | repo_init_revisions(r, &revs, NULL); | |
195 | for (i = 0; i < p->nr; i++) { | |
196 | struct ref_list_entry *e = p->list + i; | |
197 | struct object *o = parse_object(r, &e->oid); | |
198 | if (o) { | |
199 | o->flags |= PREREQ_MARK; | |
200 | add_pending_object(&revs, o, e->name); | |
201 | continue; | |
202 | } | |
203 | if (++ret == 1) | |
204 | error("%s", message); | |
205 | error("%s %s", oid_to_hex(&e->oid), e->name); | |
206 | } | |
207 | if (revs.pending.nr != p->nr) | |
208 | return ret; | |
209 | req_nr = revs.pending.nr; | |
210 | setup_revisions(2, argv, &revs, NULL); | |
211 | ||
212 | if (prepare_revision_walk(&revs)) | |
213 | die(_("revision walk setup failed")); | |
214 | ||
215 | i = req_nr; | |
216 | while (i && (commit = get_revision(&revs))) | |
217 | if (commit->object.flags & PREREQ_MARK) | |
218 | i--; | |
219 | ||
220 | for (i = 0; i < p->nr; i++) { | |
221 | struct ref_list_entry *e = p->list + i; | |
222 | struct object *o = parse_object(r, &e->oid); | |
223 | assert(o); /* otherwise we'd have returned early */ | |
224 | if (o->flags & SHOWN) | |
225 | continue; | |
226 | if (++ret == 1) | |
227 | error("%s", message); | |
228 | error("%s %s", oid_to_hex(&e->oid), e->name); | |
229 | } | |
230 | ||
231 | /* Clean up objects used, as they will be reused. */ | |
232 | for (i = 0; i < p->nr; i++) { | |
233 | struct ref_list_entry *e = p->list + i; | |
234 | commit = lookup_commit_reference_gently(r, &e->oid, 1); | |
235 | if (commit) | |
236 | clear_commit_marks(commit, ALL_REV_FLAGS); | |
237 | } | |
238 | ||
239 | if (verbose) { | |
240 | struct ref_list *r; | |
241 | ||
242 | r = &header->references; | |
243 | printf_ln(Q_("The bundle contains this ref:", | |
244 | "The bundle contains these %d refs:", | |
245 | r->nr), | |
246 | r->nr); | |
247 | list_refs(r, 0, NULL); | |
248 | r = &header->prerequisites; | |
249 | if (!r->nr) { | |
250 | printf_ln(_("The bundle records a complete history.")); | |
251 | } else { | |
252 | printf_ln(Q_("The bundle requires this ref:", | |
253 | "The bundle requires these %d refs:", | |
254 | r->nr), | |
255 | r->nr); | |
256 | list_refs(r, 0, NULL); | |
257 | } | |
258 | } | |
259 | return ret; | |
260 | } | |
261 | ||
262 | int list_bundle_refs(struct bundle_header *header, int argc, const char **argv) | |
263 | { | |
264 | return list_refs(&header->references, argc, argv); | |
265 | } | |
266 | ||
267 | static int is_tag_in_date_range(struct object *tag, struct rev_info *revs) | |
268 | { | |
269 | unsigned long size; | |
270 | enum object_type type; | |
271 | char *buf = NULL, *line, *lineend; | |
272 | timestamp_t date; | |
273 | int result = 1; | |
274 | ||
275 | if (revs->max_age == -1 && revs->min_age == -1) | |
276 | goto out; | |
277 | ||
278 | buf = read_object_file(&tag->oid, &type, &size); | |
279 | if (!buf) | |
280 | goto out; | |
281 | line = memmem(buf, size, "\ntagger ", 8); | |
282 | if (!line++) | |
283 | goto out; | |
284 | lineend = memchr(line, '\n', buf + size - line); | |
285 | line = memchr(line, '>', lineend ? lineend - line : buf + size - line); | |
286 | if (!line++) | |
287 | goto out; | |
288 | date = parse_timestamp(line, NULL, 10); | |
289 | result = (revs->max_age == -1 || revs->max_age < date) && | |
290 | (revs->min_age == -1 || revs->min_age > date); | |
291 | out: | |
292 | free(buf); | |
293 | return result; | |
294 | } | |
295 | ||
296 | ||
297 | /* Write the pack data to bundle_fd */ | |
298 | static int write_pack_data(int bundle_fd, struct rev_info *revs, struct strvec *pack_options) | |
299 | { | |
300 | struct child_process pack_objects = CHILD_PROCESS_INIT; | |
301 | int i; | |
302 | ||
303 | strvec_pushl(&pack_objects.args, | |
304 | "pack-objects", | |
305 | "--stdout", "--thin", "--delta-base-offset", | |
306 | NULL); | |
307 | strvec_pushv(&pack_objects.args, pack_options->v); | |
308 | pack_objects.in = -1; | |
309 | pack_objects.out = bundle_fd; | |
310 | pack_objects.git_cmd = 1; | |
311 | ||
312 | /* | |
313 | * start_command() will close our descriptor if it's >1. Duplicate it | |
314 | * to avoid surprising the caller. | |
315 | */ | |
316 | if (pack_objects.out > 1) { | |
317 | pack_objects.out = dup(pack_objects.out); | |
318 | if (pack_objects.out < 0) { | |
319 | error_errno(_("unable to dup bundle descriptor")); | |
320 | child_process_clear(&pack_objects); | |
321 | return -1; | |
322 | } | |
323 | } | |
324 | ||
325 | if (start_command(&pack_objects)) | |
326 | return error(_("Could not spawn pack-objects")); | |
327 | ||
328 | for (i = 0; i < revs->pending.nr; i++) { | |
329 | struct object *object = revs->pending.objects[i].item; | |
330 | if (object->flags & UNINTERESTING) | |
331 | write_or_die(pack_objects.in, "^", 1); | |
332 | write_or_die(pack_objects.in, oid_to_hex(&object->oid), the_hash_algo->hexsz); | |
333 | write_or_die(pack_objects.in, "\n", 1); | |
334 | } | |
335 | close(pack_objects.in); | |
336 | if (finish_command(&pack_objects)) | |
337 | return error(_("pack-objects died")); | |
338 | return 0; | |
339 | } | |
340 | ||
341 | static int compute_and_write_prerequisites(int bundle_fd, | |
342 | struct rev_info *revs, | |
343 | int argc, const char **argv) | |
344 | { | |
345 | struct child_process rls = CHILD_PROCESS_INIT; | |
346 | struct strbuf buf = STRBUF_INIT; | |
347 | FILE *rls_fout; | |
348 | int i; | |
349 | ||
350 | strvec_pushl(&rls.args, | |
351 | "rev-list", "--boundary", "--pretty=oneline", | |
352 | NULL); | |
353 | for (i = 1; i < argc; i++) | |
354 | strvec_push(&rls.args, argv[i]); | |
355 | rls.out = -1; | |
356 | rls.git_cmd = 1; | |
357 | if (start_command(&rls)) | |
358 | return -1; | |
359 | rls_fout = xfdopen(rls.out, "r"); | |
360 | while (strbuf_getwholeline(&buf, rls_fout, '\n') != EOF) { | |
361 | struct object_id oid; | |
362 | if (buf.len > 0 && buf.buf[0] == '-') { | |
363 | write_or_die(bundle_fd, buf.buf, buf.len); | |
364 | if (!get_oid_hex(buf.buf + 1, &oid)) { | |
365 | struct object *object = parse_object_or_die(&oid, | |
366 | buf.buf); | |
367 | object->flags |= UNINTERESTING; | |
368 | add_pending_object(revs, object, buf.buf); | |
369 | } | |
370 | } else if (!get_oid_hex(buf.buf, &oid)) { | |
371 | struct object *object = parse_object_or_die(&oid, | |
372 | buf.buf); | |
373 | object->flags |= SHOWN; | |
374 | } | |
375 | } | |
376 | strbuf_release(&buf); | |
377 | fclose(rls_fout); | |
378 | if (finish_command(&rls)) | |
379 | return error(_("rev-list died")); | |
380 | return 0; | |
381 | } | |
382 | ||
383 | /* | |
384 | * Write out bundle refs based on the tips already | |
385 | * parsed into revs.pending. As a side effect, may | |
386 | * manipulate revs.pending to include additional | |
387 | * necessary objects (like tags). | |
388 | * | |
389 | * Returns the number of refs written, or negative | |
390 | * on error. | |
391 | */ | |
392 | static int write_bundle_refs(int bundle_fd, struct rev_info *revs) | |
393 | { | |
394 | int i; | |
395 | int ref_count = 0; | |
396 | ||
397 | for (i = 0; i < revs->pending.nr; i++) { | |
398 | struct object_array_entry *e = revs->pending.objects + i; | |
399 | struct object_id oid; | |
400 | char *ref; | |
401 | const char *display_ref; | |
402 | int flag; | |
403 | ||
404 | if (e->item->flags & UNINTERESTING) | |
405 | continue; | |
406 | if (dwim_ref(e->name, strlen(e->name), &oid, &ref, 0) != 1) | |
407 | goto skip_write_ref; | |
408 | if (read_ref_full(e->name, RESOLVE_REF_READING, &oid, &flag)) | |
409 | flag = 0; | |
410 | display_ref = (flag & REF_ISSYMREF) ? e->name : ref; | |
411 | ||
412 | if (e->item->type == OBJ_TAG && | |
413 | !is_tag_in_date_range(e->item, revs)) { | |
414 | e->item->flags |= UNINTERESTING; | |
415 | goto skip_write_ref; | |
416 | } | |
417 | ||
418 | /* | |
419 | * Make sure the refs we wrote out is correct; --max-count and | |
420 | * other limiting options could have prevented all the tips | |
421 | * from getting output. | |
422 | * | |
423 | * Non commit objects such as tags and blobs do not have | |
424 | * this issue as they are not affected by those extra | |
425 | * constraints. | |
426 | */ | |
427 | if (!(e->item->flags & SHOWN) && e->item->type == OBJ_COMMIT) { | |
428 | warning(_("ref '%s' is excluded by the rev-list options"), | |
429 | e->name); | |
430 | goto skip_write_ref; | |
431 | } | |
432 | /* | |
433 | * If you run "git bundle create bndl v1.0..v2.0", the | |
434 | * name of the positive ref is "v2.0" but that is the | |
435 | * commit that is referenced by the tag, and not the tag | |
436 | * itself. | |
437 | */ | |
438 | if (!oideq(&oid, &e->item->oid)) { | |
439 | /* | |
440 | * Is this the positive end of a range expressed | |
441 | * in terms of a tag (e.g. v2.0 from the range | |
442 | * "v1.0..v2.0")? | |
443 | */ | |
444 | struct commit *one = lookup_commit_reference(revs->repo, &oid); | |
445 | struct object *obj; | |
446 | ||
447 | if (e->item == &(one->object)) { | |
448 | /* | |
449 | * Need to include e->name as an | |
450 | * independent ref to the pack-objects | |
451 | * input, so that the tag is included | |
452 | * in the output; otherwise we would | |
453 | * end up triggering "empty bundle" | |
454 | * error. | |
455 | */ | |
456 | obj = parse_object_or_die(&oid, e->name); | |
457 | obj->flags |= SHOWN; | |
458 | add_pending_object(revs, obj, e->name); | |
459 | } | |
460 | goto skip_write_ref; | |
461 | } | |
462 | ||
463 | ref_count++; | |
464 | write_or_die(bundle_fd, oid_to_hex(&e->item->oid), the_hash_algo->hexsz); | |
465 | write_or_die(bundle_fd, " ", 1); | |
466 | write_or_die(bundle_fd, display_ref, strlen(display_ref)); | |
467 | write_or_die(bundle_fd, "\n", 1); | |
468 | skip_write_ref: | |
469 | free(ref); | |
470 | } | |
471 | ||
472 | /* end header */ | |
473 | write_or_die(bundle_fd, "\n", 1); | |
474 | return ref_count; | |
475 | } | |
476 | ||
477 | int create_bundle(struct repository *r, const char *path, | |
478 | int argc, const char **argv, struct strvec *pack_options, int version) | |
479 | { | |
480 | struct lock_file lock = LOCK_INIT; | |
481 | int bundle_fd = -1; | |
482 | int bundle_to_stdout; | |
483 | int ref_count = 0; | |
484 | struct rev_info revs; | |
485 | int min_version = the_hash_algo == &hash_algos[GIT_HASH_SHA1] ? 2 : 3; | |
486 | ||
487 | bundle_to_stdout = !strcmp(path, "-"); | |
488 | if (bundle_to_stdout) | |
489 | bundle_fd = 1; | |
490 | else | |
491 | bundle_fd = hold_lock_file_for_update(&lock, path, | |
492 | LOCK_DIE_ON_ERROR); | |
493 | ||
494 | if (version == -1) | |
495 | version = min_version; | |
496 | ||
497 | if (version < 2 || version > 3) { | |
498 | die(_("unsupported bundle version %d"), version); | |
499 | } else if (version < min_version) { | |
500 | die(_("cannot write bundle version %d with algorithm %s"), version, the_hash_algo->name); | |
501 | } else if (version == 2) { | |
502 | write_or_die(bundle_fd, v2_bundle_signature, strlen(v2_bundle_signature)); | |
503 | } else { | |
504 | const char *capability = "@object-format="; | |
505 | write_or_die(bundle_fd, v3_bundle_signature, strlen(v3_bundle_signature)); | |
506 | write_or_die(bundle_fd, capability, strlen(capability)); | |
507 | write_or_die(bundle_fd, the_hash_algo->name, strlen(the_hash_algo->name)); | |
508 | write_or_die(bundle_fd, "\n", 1); | |
509 | } | |
510 | ||
511 | /* init revs to list objects for pack-objects later */ | |
512 | save_commit_buffer = 0; | |
513 | repo_init_revisions(r, &revs, NULL); | |
514 | ||
515 | /* write prerequisites */ | |
516 | if (compute_and_write_prerequisites(bundle_fd, &revs, argc, argv)) | |
517 | goto err; | |
518 | ||
519 | argc = setup_revisions(argc, argv, &revs, NULL); | |
520 | ||
521 | if (argc > 1) { | |
522 | error(_("unrecognized argument: %s"), argv[1]); | |
523 | goto err; | |
524 | } | |
525 | ||
526 | object_array_remove_duplicates(&revs.pending); | |
527 | ||
528 | ref_count = write_bundle_refs(bundle_fd, &revs); | |
529 | if (!ref_count) | |
530 | die(_("Refusing to create empty bundle.")); | |
531 | else if (ref_count < 0) | |
532 | goto err; | |
533 | ||
534 | /* write pack */ | |
535 | if (write_pack_data(bundle_fd, &revs, pack_options)) | |
536 | goto err; | |
537 | ||
538 | if (!bundle_to_stdout) { | |
539 | if (commit_lock_file(&lock)) | |
540 | die_errno(_("cannot create '%s'"), path); | |
541 | } | |
542 | return 0; | |
543 | err: | |
544 | rollback_lock_file(&lock); | |
545 | return -1; | |
546 | } | |
547 | ||
548 | int unbundle(struct repository *r, struct bundle_header *header, | |
549 | int bundle_fd, int flags) | |
550 | { | |
551 | const char *argv_index_pack[] = {"index-pack", | |
552 | "--fix-thin", "--stdin", NULL, NULL}; | |
553 | struct child_process ip = CHILD_PROCESS_INIT; | |
554 | ||
555 | if (flags & BUNDLE_VERBOSE) | |
556 | argv_index_pack[3] = "-v"; | |
557 | ||
558 | if (verify_bundle(r, header, 0)) | |
559 | return -1; | |
560 | ip.argv = argv_index_pack; | |
561 | ip.in = bundle_fd; | |
562 | ip.no_stdout = 1; | |
563 | ip.git_cmd = 1; | |
564 | if (run_command(&ip)) | |
565 | return error(_("index-pack died")); | |
566 | return 0; | |
567 | } |