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"
14static const char bundle_signature[] = "# v2 git bundle\n";
16static 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}
25static int parse_bundle_header(int fd, struct bundle_header *header,
27 const char *report_path)
28{
29 struct strbuf buf = STRBUF_INIT;
30 int status = 0;
31 /* 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;
40 }
41 /* 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;
48 if (*buf.buf == '-') {
50 is_prereq = 1;
51 strbuf_remove(&buf, 0, 1);
52 }
53 strbuf_rtrim(&buf);
54 /*
56 * Tip lines have object name, SP, and refname.
57 * Prerequisites have object name that is optionally
58 * followed by SP and subject line.
59 */
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);
73 }
74 }
75 abort:
77 if (status) {
78 close(fd);
79 fd = -1;
80 }
81 strbuf_release(&buf);
82 return fd;
83}
84int read_bundle_header(const char *path, struct bundle_header *header)
86{
87 int fd = open(path, O_RDONLY);
88 if (fd < 0)
90 return error(_("could not open '%s'"), path);
91 return parse_bundle_header(fd, header, path);
92}
93int is_bundle(const char *path, int quiet)
95{
96 struct bundle_header header;
97 int fd = open(path, O_RDONLY);
98 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);
106}
107static int list_refs(struct ref_list *r, int argc, const char **argv)
109{
110 int i;
111 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;
120 }
121 printf("%s %s\n", oid_to_hex(&r->list[i].oid),
122 r->list[i].name);
123 }
124 return 0;
125}
126/* Remember to update object flag allocation in object.h */
128#define PREREQ_MARK (1u<<16)
129int verify_bundle(struct bundle_header *header, int verbose)
131{
132 /*
133 * Do fast check, then if any prereqs are missing then go line by line
134 * to be verbose about the errors
135 */
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:");
142 init_revisions(&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;
151 }
152 if (++ret == 1)
153 error("%s", message);
154 error("%s %s", oid_to_hex(&e->oid), e->name);
155 }
156 if (revs.pending.nr != p->nr)
157 return ret;
158 req_nr = revs.pending.nr;
159 setup_revisions(2, argv, &revs, NULL);
160 if (prepare_revision_walk(&revs))
162 die(_("revision walk setup failed"));
163 i = req_nr;
165 while (i && (commit = get_revision(&revs)))
166 if (commit->object.flags & PREREQ_MARK)
167 i--;
168 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);
178 }
179 /* 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);
186 }
187 if (verbose) {
189 struct ref_list *r;
190 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);
206 }
207 }
208 return ret;
209}
210int list_bundle_refs(struct bundle_header *header, int argc, const char **argv)
212{
213 return list_refs(&header->references, argc, argv);
214}
215static int is_tag_in_date_range(struct object *tag, struct rev_info *revs)
217{
218 unsigned long size;
219 enum object_type type;
220 char *buf = NULL, *line, *lineend;
221 timestamp_t date;
222 int result = 1;
223 if (revs->max_age == -1 && revs->min_age == -1)
225 goto out;
226 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);
240out:
241 free(buf);
242 return result;
243}
244/* Write the pack data to bundle_fd, then close it if it is > 1. */
247static int write_pack_data(int bundle_fd, struct rev_info *revs)
248{
249 struct child_process pack_objects = CHILD_PROCESS_INIT;
250 int i;
251 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;
259 if (start_command(&pack_objects))
260 return error(_("Could not spawn pack-objects"));
261 for (i = 0; i < revs->pending.nr; i++) {
263 struct object *object = revs->pending.objects[i].item;
264 if (object->flags & UNINTERESTING)
265 write_or_die(pack_objects.in, "^", 1);
266 write_or_die(pack_objects.in, oid_to_hex(&object->oid), GIT_SHA1_HEXSZ);
267 write_or_die(pack_objects.in, "\n", 1);
268 }
269 close(pack_objects.in);
270 if (finish_command(&pack_objects))
271 return error(_("pack-objects died"));
272 return 0;
273}
274static int compute_and_write_prerequisites(int bundle_fd,
276 struct rev_info *revs,
277 int argc, const char **argv)
278{
279 struct child_process rls = CHILD_PROCESS_INIT;
280 struct strbuf buf = STRBUF_INIT;
281 FILE *rls_fout;
282 int i;
283 argv_array_pushl(&rls.args,
285 "rev-list", "--boundary", "--pretty=oneline",
286 NULL);
287 for (i = 1; i < argc; i++)
288 argv_array_push(&rls.args, argv[i]);
289 rls.out = -1;
290 rls.git_cmd = 1;
291 if (start_command(&rls))
292 return -1;
293 rls_fout = xfdopen(rls.out, "r");
294 while (strbuf_getwholeline(&buf, rls_fout, '\n') != EOF) {
295 struct object_id oid;
296 if (buf.len > 0 && buf.buf[0] == '-') {
297 write_or_die(bundle_fd, buf.buf, buf.len);
298 if (!get_oid_hex(buf.buf + 1, &oid)) {
299 struct object *object = parse_object_or_die(&oid,
300 buf.buf);
301 object->flags |= UNINTERESTING;
302 add_pending_object(revs, object, buf.buf);
303 }
304 } else if (!get_oid_hex(buf.buf, &oid)) {
305 struct object *object = parse_object_or_die(&oid,
306 buf.buf);
307 object->flags |= SHOWN;
308 }
309 }
310 strbuf_release(&buf);
311 fclose(rls_fout);
312 if (finish_command(&rls))
313 return error(_("rev-list died"));
314 return 0;
315}
316/*
318 * Write out bundle refs based on the tips already
319 * parsed into revs.pending. As a side effect, may
320 * manipulate revs.pending to include additional
321 * necessary objects (like tags).
322 *
323 * Returns the number of refs written, or negative
324 * on error.
325 */
326static int write_bundle_refs(int bundle_fd, struct rev_info *revs)
327{
328 int i;
329 int ref_count = 0;
330 for (i = 0; i < revs->pending.nr; i++) {
332 struct object_array_entry *e = revs->pending.objects + i;
333 struct object_id oid;
334 char *ref;
335 const char *display_ref;
336 int flag;
337 if (e->item->flags & UNINTERESTING)
339 continue;
340 if (dwim_ref(e->name, strlen(e->name), &oid, &ref) != 1)
341 goto skip_write_ref;
342 if (read_ref_full(e->name, RESOLVE_REF_READING, &oid, &flag))
343 flag = 0;
344 display_ref = (flag & REF_ISSYMREF) ? e->name : ref;
345 if (e->item->type == OBJ_TAG &&
347 !is_tag_in_date_range(e->item, revs)) {
348 e->item->flags |= UNINTERESTING;
349 goto skip_write_ref;
350 }
351 /*
353 * Make sure the refs we wrote out is correct; --max-count and
354 * other limiting options could have prevented all the tips
355 * from getting output.
356 *
357 * Non commit objects such as tags and blobs do not have
358 * this issue as they are not affected by those extra
359 * constraints.
360 */
361 if (!(e->item->flags & SHOWN) && e->item->type == OBJ_COMMIT) {
362 warning(_("ref '%s' is excluded by the rev-list options"),
363 e->name);
364 goto skip_write_ref;
365 }
366 /*
367 * If you run "git bundle create bndl v1.0..v2.0", the
368 * name of the positive ref is "v2.0" but that is the
369 * commit that is referenced by the tag, and not the tag
370 * itself.
371 */
372 if (!oideq(&oid, &e->item->oid)) {
373 /*
374 * Is this the positive end of a range expressed
375 * in terms of a tag (e.g. v2.0 from the range
376 * "v1.0..v2.0")?
377 */
378 struct commit *one = lookup_commit_reference(the_repository,
379 &oid);
380 struct object *obj;
381 if (e->item == &(one->object)) {
383 /*
384 * Need to include e->name as an
385 * independent ref to the pack-objects
386 * input, so that the tag is included
387 * in the output; otherwise we would
388 * end up triggering "empty bundle"
389 * error.
390 */
391 obj = parse_object_or_die(&oid, e->name);
392 obj->flags |= SHOWN;
393 add_pending_object(revs, obj, e->name);
394 }
395 goto skip_write_ref;
396 }
397 ref_count++;
399 write_or_die(bundle_fd, oid_to_hex(&e->item->oid), 40);
400 write_or_die(bundle_fd, " ", 1);
401 write_or_die(bundle_fd, display_ref, strlen(display_ref));
402 write_or_die(bundle_fd, "\n", 1);
403 skip_write_ref:
404 free(ref);
405 }
406 /* end header */
408 write_or_die(bundle_fd, "\n", 1);
409 return ref_count;
410}
411int create_bundle(struct bundle_header *header, const char *path,
413 int argc, const char **argv)
414{
415 struct lock_file lock = LOCK_INIT;
416 int bundle_fd = -1;
417 int bundle_to_stdout;
418 int ref_count = 0;
419 struct rev_info revs;
420 bundle_to_stdout = !strcmp(path, "-");
422 if (bundle_to_stdout)
423 bundle_fd = 1;
424 else {
425 bundle_fd = hold_lock_file_for_update(&lock, path,
426 LOCK_DIE_ON_ERROR);
427 /*
429 * write_pack_data() will close the fd passed to it,
430 * but commit_lock_file() will also try to close the
431 * lockfile's fd. So make a copy of the file
432 * descriptor to avoid trying to close it twice.
433 */
434 bundle_fd = dup(bundle_fd);
435 if (bundle_fd < 0)
436 die_errno("unable to dup file descriptor");
437 }
438 /* write signature */
440 write_or_die(bundle_fd, bundle_signature, strlen(bundle_signature));
441 /* init revs to list objects for pack-objects later */
443 save_commit_buffer = 0;
444 init_revisions(&revs, NULL);
445 /* write prerequisites */
447 if (compute_and_write_prerequisites(bundle_fd, &revs, argc, argv))
448 goto err;
449 argc = setup_revisions(argc, argv, &revs, NULL);
451 if (argc > 1) {
453 error(_("unrecognized argument: %s"), argv[1]);
454 goto err;
455 }
456 object_array_remove_duplicates(&revs.pending);
458 ref_count = write_bundle_refs(bundle_fd, &revs);
460 if (!ref_count)
461 die(_("Refusing to create empty bundle."));
462 else if (ref_count < 0)
463 goto err;
464 /* write pack */
466 if (write_pack_data(bundle_fd, &revs)) {
467 bundle_fd = -1; /* already closed by the above call */
468 goto err;
469 }
470 if (!bundle_to_stdout) {
472 if (commit_lock_file(&lock))
473 die_errno(_("cannot create '%s'"), path);
474 }
475 return 0;
476err:
477 if (!bundle_to_stdout) {
478 if (0 <= bundle_fd)
479 close(bundle_fd);
480 rollback_lock_file(&lock);
481 }
482 return -1;
483}
484int unbundle(struct bundle_header *header, int bundle_fd, int flags)
486{
487 const char *argv_index_pack[] = {"index-pack",
488 "--fix-thin", "--stdin", NULL, NULL};
489 struct child_process ip = CHILD_PROCESS_INIT;
490 if (flags & BUNDLE_VERBOSE)
492 argv_index_pack[3] = "-v";
493 if (verify_bundle(header, 0))
495 return -1;
496 ip.argv = argv_index_pack;
497 ip.in = bundle_fd;
498 ip.no_stdout = 1;
499 ip.git_cmd = 1;
500 if (run_command(&ip))
501 return error(_("index-pack died"));
502 return 0;
503}