transport-helper: drop read/write errno checks
[git.git] / bundle.c
blob88c3e16d86162518ddde771703a3d2b0fc622f3b
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"
15 static const char bundle_signature[] = "# v2 git bundle\n";
17 static void add_to_ref_list(const struct object_id *oid, const char *name,
18 struct ref_list *list)
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++;
26 static int parse_bundle_header(int fd, struct bundle_header *header,
27 const char *report_path)
29 struct strbuf buf = STRBUF_INIT;
30 int status = 0;
32 /* The bundle header begins with the signature */
33 if (strbuf_getwholeline_fd(&buf, fd, '\n') ||
34 strcmp(buf.buf, bundle_signature)) {
35 if (report_path)
36 error(_("'%s' does not look like a v2 bundle file"),
37 report_path);
38 status = -1;
39 goto abort;
42 /* The bundle header ends with an empty line */
43 while (!strbuf_getwholeline_fd(&buf, fd, '\n') &&
44 buf.len && buf.buf[0] != '\n') {
45 struct object_id oid;
46 int is_prereq = 0;
47 const char *p;
49 if (*buf.buf == '-') {
50 is_prereq = 1;
51 strbuf_remove(&buf, 0, 1);
53 strbuf_rtrim(&buf);
56 * Tip lines have object name, SP, and refname.
57 * Prerequisites have object name that is optionally
58 * followed by SP and subject line.
60 if (parse_oid_hex(buf.buf, &oid, &p) ||
61 (*p && !isspace(*p)) ||
62 (!is_prereq && !*p)) {
63 if (report_path)
64 error(_("unrecognized header: %s%s (%d)"),
65 (is_prereq ? "-" : ""), buf.buf, (int)buf.len);
66 status = -1;
67 break;
68 } else {
69 if (is_prereq)
70 add_to_ref_list(&oid, "", &header->prerequisites);
71 else
72 add_to_ref_list(&oid, p + 1, &header->references);
76 abort:
77 if (status) {
78 close(fd);
79 fd = -1;
81 strbuf_release(&buf);
82 return fd;
85 int read_bundle_header(const char *path, struct bundle_header *header)
87 int fd = open(path, O_RDONLY);
89 if (fd < 0)
90 return error(_("could not open '%s'"), path);
91 return parse_bundle_header(fd, header, path);
94 int is_bundle(const char *path, int quiet)
96 struct bundle_header header;
97 int fd = open(path, O_RDONLY);
99 if (fd < 0)
100 return 0;
101 memset(&header, 0, sizeof(header));
102 fd = parse_bundle_header(fd, &header, quiet ? NULL : path);
103 if (fd >= 0)
104 close(fd);
105 return (fd >= 0);
108 static int list_refs(struct ref_list *r, int argc, const char **argv)
110 int i;
112 for (i = 0; i < r->nr; i++) {
113 if (argc > 1) {
114 int j;
115 for (j = 1; j < argc; j++)
116 if (!strcmp(r->list[i].name, argv[j]))
117 break;
118 if (j == argc)
119 continue;
121 printf("%s %s\n", oid_to_hex(&r->list[i].oid),
122 r->list[i].name);
124 return 0;
127 /* Remember to update object flag allocation in object.h */
128 #define PREREQ_MARK (1u<<16)
130 int verify_bundle(struct bundle_header *header, int verbose)
133 * Do fast check, then if any prereqs are missing then go line by line
134 * to be verbose about the errors
136 struct ref_list *p = &header->prerequisites;
137 struct rev_info revs;
138 const char *argv[] = {NULL, "--all", NULL};
139 struct commit *commit;
140 int i, ret = 0, req_nr;
141 const char *message = _("Repository lacks these prerequisite commits:");
143 repo_init_revisions(the_repository, &revs, NULL);
144 for (i = 0; i < p->nr; i++) {
145 struct ref_list_entry *e = p->list + i;
146 struct object *o = parse_object(the_repository, &e->oid);
147 if (o) {
148 o->flags |= PREREQ_MARK;
149 add_pending_object(&revs, o, e->name);
150 continue;
152 if (++ret == 1)
153 error("%s", message);
154 error("%s %s", oid_to_hex(&e->oid), e->name);
156 if (revs.pending.nr != p->nr)
157 return ret;
158 req_nr = revs.pending.nr;
159 setup_revisions(2, argv, &revs, NULL);
161 if (prepare_revision_walk(&revs))
162 die(_("revision walk setup failed"));
164 i = req_nr;
165 while (i && (commit = get_revision(&revs)))
166 if (commit->object.flags & PREREQ_MARK)
167 i--;
169 for (i = 0; i < p->nr; i++) {
170 struct ref_list_entry *e = p->list + i;
171 struct object *o = parse_object(the_repository, &e->oid);
172 assert(o); /* otherwise we'd have returned early */
173 if (o->flags & SHOWN)
174 continue;
175 if (++ret == 1)
176 error("%s", message);
177 error("%s %s", oid_to_hex(&e->oid), e->name);
180 /* Clean up objects used, as they will be reused. */
181 for (i = 0; i < p->nr; i++) {
182 struct ref_list_entry *e = p->list + i;
183 commit = lookup_commit_reference_gently(the_repository, &e->oid, 1);
184 if (commit)
185 clear_commit_marks(commit, ALL_REV_FLAGS);
188 if (verbose) {
189 struct ref_list *r;
191 r = &header->references;
192 printf_ln(Q_("The bundle contains this ref:",
193 "The bundle contains these %d refs:",
194 r->nr),
195 r->nr);
196 list_refs(r, 0, NULL);
197 r = &header->prerequisites;
198 if (!r->nr) {
199 printf_ln(_("The bundle records a complete history."));
200 } else {
201 printf_ln(Q_("The bundle requires this ref:",
202 "The bundle requires these %d refs:",
203 r->nr),
204 r->nr);
205 list_refs(r, 0, NULL);
208 return ret;
211 int list_bundle_refs(struct bundle_header *header, int argc, const char **argv)
213 return list_refs(&header->references, argc, argv);
216 static int is_tag_in_date_range(struct object *tag, struct rev_info *revs)
218 unsigned long size;
219 enum object_type type;
220 char *buf = NULL, *line, *lineend;
221 timestamp_t date;
222 int result = 1;
224 if (revs->max_age == -1 && revs->min_age == -1)
225 goto out;
227 buf = read_object_file(&tag->oid, &type, &size);
228 if (!buf)
229 goto out;
230 line = memmem(buf, size, "\ntagger ", 8);
231 if (!line++)
232 goto out;
233 lineend = memchr(line, '\n', buf + size - line);
234 line = memchr(line, '>', lineend ? lineend - line : buf + size - line);
235 if (!line++)
236 goto out;
237 date = parse_timestamp(line, NULL, 10);
238 result = (revs->max_age == -1 || revs->max_age < date) &&
239 (revs->min_age == -1 || revs->min_age > date);
240 out:
241 free(buf);
242 return result;
246 /* Write the pack data to bundle_fd */
247 static int write_pack_data(int bundle_fd, struct rev_info *revs)
249 struct child_process pack_objects = CHILD_PROCESS_INIT;
250 int i;
252 argv_array_pushl(&pack_objects.args,
253 "pack-objects", "--all-progress-implied",
254 "--stdout", "--thin", "--delta-base-offset",
255 NULL);
256 pack_objects.in = -1;
257 pack_objects.out = bundle_fd;
258 pack_objects.git_cmd = 1;
261 * start_command() will close our descriptor if it's >1. Duplicate it
262 * to avoid surprising the caller.
264 if (pack_objects.out > 1) {
265 pack_objects.out = dup(pack_objects.out);
266 if (pack_objects.out < 0) {
267 error_errno(_("unable to dup bundle descriptor"));
268 child_process_clear(&pack_objects);
269 return -1;
273 if (start_command(&pack_objects))
274 return error(_("Could not spawn pack-objects"));
276 for (i = 0; i < revs->pending.nr; i++) {
277 struct object *object = revs->pending.objects[i].item;
278 if (object->flags & UNINTERESTING)
279 write_or_die(pack_objects.in, "^", 1);
280 write_or_die(pack_objects.in, oid_to_hex(&object->oid), GIT_SHA1_HEXSZ);
281 write_or_die(pack_objects.in, "\n", 1);
283 close(pack_objects.in);
284 if (finish_command(&pack_objects))
285 return error(_("pack-objects died"));
286 return 0;
289 static int compute_and_write_prerequisites(int bundle_fd,
290 struct rev_info *revs,
291 int argc, const char **argv)
293 struct child_process rls = CHILD_PROCESS_INIT;
294 struct strbuf buf = STRBUF_INIT;
295 FILE *rls_fout;
296 int i;
298 argv_array_pushl(&rls.args,
299 "rev-list", "--boundary", "--pretty=oneline",
300 NULL);
301 for (i = 1; i < argc; i++)
302 argv_array_push(&rls.args, argv[i]);
303 rls.out = -1;
304 rls.git_cmd = 1;
305 if (start_command(&rls))
306 return -1;
307 rls_fout = xfdopen(rls.out, "r");
308 while (strbuf_getwholeline(&buf, rls_fout, '\n') != EOF) {
309 struct object_id oid;
310 if (buf.len > 0 && buf.buf[0] == '-') {
311 write_or_die(bundle_fd, buf.buf, buf.len);
312 if (!get_oid_hex(buf.buf + 1, &oid)) {
313 struct object *object = parse_object_or_die(&oid,
314 buf.buf);
315 object->flags |= UNINTERESTING;
316 add_pending_object(revs, object, buf.buf);
318 } else if (!get_oid_hex(buf.buf, &oid)) {
319 struct object *object = parse_object_or_die(&oid,
320 buf.buf);
321 object->flags |= SHOWN;
324 strbuf_release(&buf);
325 fclose(rls_fout);
326 if (finish_command(&rls))
327 return error(_("rev-list died"));
328 return 0;
332 * Write out bundle refs based on the tips already
333 * parsed into revs.pending. As a side effect, may
334 * manipulate revs.pending to include additional
335 * necessary objects (like tags).
337 * Returns the number of refs written, or negative
338 * on error.
340 static int write_bundle_refs(int bundle_fd, struct rev_info *revs)
342 int i;
343 int ref_count = 0;
345 for (i = 0; i < revs->pending.nr; i++) {
346 struct object_array_entry *e = revs->pending.objects + i;
347 struct object_id oid;
348 char *ref;
349 const char *display_ref;
350 int flag;
352 if (e->item->flags & UNINTERESTING)
353 continue;
354 if (dwim_ref(e->name, strlen(e->name), &oid, &ref) != 1)
355 goto skip_write_ref;
356 if (read_ref_full(e->name, RESOLVE_REF_READING, &oid, &flag))
357 flag = 0;
358 display_ref = (flag & REF_ISSYMREF) ? e->name : ref;
360 if (e->item->type == OBJ_TAG &&
361 !is_tag_in_date_range(e->item, revs)) {
362 e->item->flags |= UNINTERESTING;
363 goto skip_write_ref;
367 * Make sure the refs we wrote out is correct; --max-count and
368 * other limiting options could have prevented all the tips
369 * from getting output.
371 * Non commit objects such as tags and blobs do not have
372 * this issue as they are not affected by those extra
373 * constraints.
375 if (!(e->item->flags & SHOWN) && e->item->type == OBJ_COMMIT) {
376 warning(_("ref '%s' is excluded by the rev-list options"),
377 e->name);
378 goto skip_write_ref;
381 * If you run "git bundle create bndl v1.0..v2.0", the
382 * name of the positive ref is "v2.0" but that is the
383 * commit that is referenced by the tag, and not the tag
384 * itself.
386 if (!oideq(&oid, &e->item->oid)) {
388 * Is this the positive end of a range expressed
389 * in terms of a tag (e.g. v2.0 from the range
390 * "v1.0..v2.0")?
392 struct commit *one = lookup_commit_reference(the_repository,
393 &oid);
394 struct object *obj;
396 if (e->item == &(one->object)) {
398 * Need to include e->name as an
399 * independent ref to the pack-objects
400 * input, so that the tag is included
401 * in the output; otherwise we would
402 * end up triggering "empty bundle"
403 * error.
405 obj = parse_object_or_die(&oid, e->name);
406 obj->flags |= SHOWN;
407 add_pending_object(revs, obj, e->name);
409 goto skip_write_ref;
412 ref_count++;
413 write_or_die(bundle_fd, oid_to_hex(&e->item->oid), 40);
414 write_or_die(bundle_fd, " ", 1);
415 write_or_die(bundle_fd, display_ref, strlen(display_ref));
416 write_or_die(bundle_fd, "\n", 1);
417 skip_write_ref:
418 free(ref);
421 /* end header */
422 write_or_die(bundle_fd, "\n", 1);
423 return ref_count;
426 int create_bundle(struct bundle_header *header, const char *path,
427 int argc, const char **argv)
429 struct lock_file lock = LOCK_INIT;
430 int bundle_fd = -1;
431 int bundle_to_stdout;
432 int ref_count = 0;
433 struct rev_info revs;
435 bundle_to_stdout = !strcmp(path, "-");
436 if (bundle_to_stdout)
437 bundle_fd = 1;
438 else
439 bundle_fd = hold_lock_file_for_update(&lock, path,
440 LOCK_DIE_ON_ERROR);
442 /* write signature */
443 write_or_die(bundle_fd, bundle_signature, strlen(bundle_signature));
445 /* init revs to list objects for pack-objects later */
446 save_commit_buffer = 0;
447 repo_init_revisions(the_repository, &revs, NULL);
449 /* write prerequisites */
450 if (compute_and_write_prerequisites(bundle_fd, &revs, argc, argv))
451 goto err;
453 argc = setup_revisions(argc, argv, &revs, NULL);
455 if (argc > 1) {
456 error(_("unrecognized argument: %s"), argv[1]);
457 goto err;
460 object_array_remove_duplicates(&revs.pending);
462 ref_count = write_bundle_refs(bundle_fd, &revs);
463 if (!ref_count)
464 die(_("Refusing to create empty bundle."));
465 else if (ref_count < 0)
466 goto err;
468 /* write pack */
469 if (write_pack_data(bundle_fd, &revs))
470 goto err;
472 if (!bundle_to_stdout) {
473 if (commit_lock_file(&lock))
474 die_errno(_("cannot create '%s'"), path);
476 return 0;
477 err:
478 rollback_lock_file(&lock);
479 return -1;
482 int unbundle(struct bundle_header *header, int bundle_fd, int flags)
484 const char *argv_index_pack[] = {"index-pack",
485 "--fix-thin", "--stdin", NULL, NULL};
486 struct child_process ip = CHILD_PROCESS_INIT;
488 if (flags & BUNDLE_VERBOSE)
489 argv_index_pack[3] = "-v";
491 if (verify_bundle(header, 0))
492 return -1;
493 ip.argv = argv_index_pack;
494 ip.in = bundle_fd;
495 ip.no_stdout = 1;
496 ip.git_cmd = 1;
497 if (run_command(&ip))
498 return error(_("index-pack died"));
499 return 0;