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