1#include "cache.h"
2#include "lockfile.h"
3#include "bundle.h"
4#include "object.h"
5#include "commit.h"
6#include "diff.h"
7#include "revision.h"
8#include "list-objects.h"
9#include "run-command.h"
10#include "refs.h"
11#include "argv-array.h"
12static const char bundle_signature[] = "# v2 git bundle\n";
14static void add_to_ref_list(const struct object_id *oid, const char *name,
16 struct ref_list *list)
17{
18 ALLOC_GROW(list->list, list->nr + 1, list->alloc);
19 oidcpy(&list->list[list->nr].oid, oid);
20 list->list[list->nr].name = xstrdup(name);
21 list->nr++;
22}
23static int parse_bundle_header(int fd, struct bundle_header *header,
25 const char *report_path)
26{
27 struct strbuf buf = STRBUF_INIT;
28 int status = 0;
29 /* The bundle header begins with the signature */
31 if (strbuf_getwholeline_fd(&buf, fd, '\n') ||
32 strcmp(buf.buf, bundle_signature)) {
33 if (report_path)
34 error(_("'%s' does not look like a v2 bundle file"),
35 report_path);
36 status = -1;
37 goto abort;
38 }
39 /* The bundle header ends with an empty line */
41 while (!strbuf_getwholeline_fd(&buf, fd, '\n') &&
42 buf.len && buf.buf[0] != '\n') {
43 struct object_id oid;
44 int is_prereq = 0;
45 const char *p;
46 if (*buf.buf == '-') {
48 is_prereq = 1;
49 strbuf_remove(&buf, 0, 1);
50 }
51 strbuf_rtrim(&buf);
52 /*
54 * Tip lines have object name, SP, and refname.
55 * Prerequisites have object name that is optionally
56 * followed by SP and subject line.
57 */
58 if (parse_oid_hex(buf.buf, &oid, &p) ||
59 (*p && !isspace(*p)) ||
60 (!is_prereq && !*p)) {
61 if (report_path)
62 error(_("unrecognized header: %s%s (%d)"),
63 (is_prereq ? "-" : ""), buf.buf, (int)buf.len);
64 status = -1;
65 break;
66 } else {
67 if (is_prereq)
68 add_to_ref_list(&oid, "", &header->prerequisites);
69 else
70 add_to_ref_list(&oid, p + 1, &header->references);
71 }
72 }
73 abort:
75 if (status) {
76 close(fd);
77 fd = -1;
78 }
79 strbuf_release(&buf);
80 return fd;
81}
82int read_bundle_header(const char *path, struct bundle_header *header)
84{
85 int fd = open(path, O_RDONLY);
86 if (fd < 0)
88 return error(_("could not open '%s'"), path);
89 return parse_bundle_header(fd, header, path);
90}
91int is_bundle(const char *path, int quiet)
93{
94 struct bundle_header header;
95 int fd = open(path, O_RDONLY);
96 if (fd < 0)
98 return 0;
99 memset(&header, 0, sizeof(header));
100 fd = parse_bundle_header(fd, &header, quiet ? NULL : path);
101 if (fd >= 0)
102 close(fd);
103 return (fd >= 0);
104}
105static int list_refs(struct ref_list *r, int argc, const char **argv)
107{
108 int i;
109 for (i = 0; i < r->nr; i++) {
111 if (argc > 1) {
112 int j;
113 for (j = 1; j < argc; j++)
114 if (!strcmp(r->list[i].name, argv[j]))
115 break;
116 if (j == argc)
117 continue;
118 }
119 printf("%s %s\n", oid_to_hex(&r->list[i].oid),
120 r->list[i].name);
121 }
122 return 0;
123}
124/* Remember to update object flag allocation in object.h */
126#define PREREQ_MARK (1u<<16)
127int verify_bundle(struct bundle_header *header, int verbose)
129{
130 /*
131 * Do fast check, then if any prereqs are missing then go line by line
132 * to be verbose about the errors
133 */
134 struct ref_list *p = &header->prerequisites;
135 struct rev_info revs;
136 const char *argv[] = {NULL, "--all", NULL};
137 struct commit *commit;
138 int i, ret = 0, req_nr;
139 const char *message = _("Repository lacks these prerequisite commits:");
140 init_revisions(&revs, NULL);
142 for (i = 0; i < p->nr; i++) {
143 struct ref_list_entry *e = p->list + i;
144 struct object *o = parse_object(&e->oid);
145 if (o) {
146 o->flags |= PREREQ_MARK;
147 add_pending_object(&revs, o, e->name);
148 continue;
149 }
150 if (++ret == 1)
151 error("%s", message);
152 error("%s %s", oid_to_hex(&e->oid), e->name);
153 }
154 if (revs.pending.nr != p->nr)
155 return ret;
156 req_nr = revs.pending.nr;
157 setup_revisions(2, argv, &revs, NULL);
158 if (prepare_revision_walk(&revs))
160 die(_("revision walk setup failed"));
161 i = req_nr;
163 while (i && (commit = get_revision(&revs)))
164 if (commit->object.flags & PREREQ_MARK)
165 i--;
166 for (i = 0; i < p->nr; i++) {
168 struct ref_list_entry *e = p->list + i;
169 struct object *o = parse_object(&e->oid);
170 assert(o); /* otherwise we'd have returned early */
171 if (o->flags & SHOWN)
172 continue;
173 if (++ret == 1)
174 error("%s", message);
175 error("%s %s", oid_to_hex(&e->oid), e->name);
176 }
177 /* Clean up objects used, as they will be reused. */
179 for (i = 0; i < p->nr; i++) {
180 struct ref_list_entry *e = p->list + i;
181 commit = lookup_commit_reference_gently(&e->oid, 1);
182 if (commit)
183 clear_commit_marks(commit, ALL_REV_FLAGS);
184 }
185 if (verbose) {
187 struct ref_list *r;
188 r = &header->references;
190 printf_ln(Q_("The bundle contains this ref:",
191 "The bundle contains these %d refs:",
192 r->nr),
193 r->nr);
194 list_refs(r, 0, NULL);
195 r = &header->prerequisites;
196 if (!r->nr) {
197 printf_ln(_("The bundle records a complete history."));
198 } else {
199 printf_ln(Q_("The bundle requires this ref:",
200 "The bundle requires these %d refs:",
201 r->nr),
202 r->nr);
203 list_refs(r, 0, NULL);
204 }
205 }
206 return ret;
207}
208int list_bundle_refs(struct bundle_header *header, int argc, const char **argv)
210{
211 return list_refs(&header->references, argc, argv);
212}
213static int is_tag_in_date_range(struct object *tag, struct rev_info *revs)
215{
216 unsigned long size;
217 enum object_type type;
218 char *buf = NULL, *line, *lineend;
219 timestamp_t date;
220 int result = 1;
221 if (revs->max_age == -1 && revs->min_age == -1)
223 goto out;
224 buf = read_sha1_file(tag->oid.hash, &type, &size);
226 if (!buf)
227 goto out;
228 line = memmem(buf, size, "\ntagger ", 8);
229 if (!line++)
230 goto out;
231 lineend = memchr(line, '\n', buf + size - line);
232 line = memchr(line, '>', lineend ? lineend - line : buf + size - line);
233 if (!line++)
234 goto out;
235 date = parse_timestamp(line, NULL, 10);
236 result = (revs->max_age == -1 || revs->max_age < date) &&
237 (revs->min_age == -1 || revs->min_age > date);
238out:
239 free(buf);
240 return result;
241}
242/* Write the pack data to bundle_fd, then close it if it is > 1. */
245static int write_pack_data(int bundle_fd, struct rev_info *revs)
246{
247 struct child_process pack_objects = CHILD_PROCESS_INIT;
248 int i;
249 argv_array_pushl(&pack_objects.args,
251 "pack-objects", "--all-progress-implied",
252 "--stdout", "--thin", "--delta-base-offset",
253 NULL);
254 pack_objects.in = -1;
255 pack_objects.out = bundle_fd;
256 pack_objects.git_cmd = 1;
257 if (start_command(&pack_objects))
258 return error(_("Could not spawn pack-objects"));
259 for (i = 0; i < revs->pending.nr; i++) {
261 struct object *object = revs->pending.objects[i].item;
262 if (object->flags & UNINTERESTING)
263 write_or_die(pack_objects.in, "^", 1);
264 write_or_die(pack_objects.in, oid_to_hex(&object->oid), GIT_SHA1_HEXSZ);
265 write_or_die(pack_objects.in, "\n", 1);
266 }
267 close(pack_objects.in);
268 if (finish_command(&pack_objects))
269 return error(_("pack-objects died"));
270 return 0;
271}
272static int compute_and_write_prerequisites(int bundle_fd,
274 struct rev_info *revs,
275 int argc, const char **argv)
276{
277 struct child_process rls = CHILD_PROCESS_INIT;
278 struct strbuf buf = STRBUF_INIT;
279 FILE *rls_fout;
280 int i;
281 argv_array_pushl(&rls.args,
283 "rev-list", "--boundary", "--pretty=oneline",
284 NULL);
285 for (i = 1; i < argc; i++)
286 argv_array_push(&rls.args, argv[i]);
287 rls.out = -1;
288 rls.git_cmd = 1;
289 if (start_command(&rls))
290 return -1;
291 rls_fout = xfdopen(rls.out, "r");
292 while (strbuf_getwholeline(&buf, rls_fout, '\n') != EOF) {
293 struct object_id oid;
294 if (buf.len > 0 && buf.buf[0] == '-') {
295 write_or_die(bundle_fd, buf.buf, buf.len);
296 if (!get_oid_hex(buf.buf + 1, &oid)) {
297 struct object *object = parse_object_or_die(&oid,
298 buf.buf);
299 object->flags |= UNINTERESTING;
300 add_pending_object(revs, object, buf.buf);
301 }
302 } else if (!get_oid_hex(buf.buf, &oid)) {
303 struct object *object = parse_object_or_die(&oid,
304 buf.buf);
305 object->flags |= SHOWN;
306 }
307 }
308 strbuf_release(&buf);
309 fclose(rls_fout);
310 if (finish_command(&rls))
311 return error(_("rev-list died"));
312 return 0;
313}
314/*
316 * Write out bundle refs based on the tips already
317 * parsed into revs.pending. As a side effect, may
318 * manipulate revs.pending to include additional
319 * necessary objects (like tags).
320 *
321 * Returns the number of refs written, or negative
322 * on error.
323 */
324static int write_bundle_refs(int bundle_fd, struct rev_info *revs)
325{
326 int i;
327 int ref_count = 0;
328 for (i = 0; i < revs->pending.nr; i++) {
330 struct object_array_entry *e = revs->pending.objects + i;
331 struct object_id oid;
332 char *ref;
333 const char *display_ref;
334 int flag;
335 if (e->item->flags & UNINTERESTING)
337 continue;
338 if (dwim_ref(e->name, strlen(e->name), &oid, &ref) != 1)
339 goto skip_write_ref;
340 if (read_ref_full(e->name, RESOLVE_REF_READING, &oid, &flag))
341 flag = 0;
342 display_ref = (flag & REF_ISSYMREF) ? e->name : ref;
343 if (e->item->type == OBJ_TAG &&
345 !is_tag_in_date_range(e->item, revs)) {
346 e->item->flags |= UNINTERESTING;
347 goto skip_write_ref;
348 }
349 /*
351 * Make sure the refs we wrote out is correct; --max-count and
352 * other limiting options could have prevented all the tips
353 * from getting output.
354 *
355 * Non commit objects such as tags and blobs do not have
356 * this issue as they are not affected by those extra
357 * constraints.
358 */
359 if (!(e->item->flags & SHOWN) && e->item->type == OBJ_COMMIT) {
360 warning(_("ref '%s' is excluded by the rev-list options"),
361 e->name);
362 goto skip_write_ref;
363 }
364 /*
365 * If you run "git bundle create bndl v1.0..v2.0", the
366 * name of the positive ref is "v2.0" but that is the
367 * commit that is referenced by the tag, and not the tag
368 * itself.
369 */
370 if (oidcmp(&oid, &e->item->oid)) {
371 /*
372 * Is this the positive end of a range expressed
373 * in terms of a tag (e.g. v2.0 from the range
374 * "v1.0..v2.0")?
375 */
376 struct commit *one = lookup_commit_reference(&oid);
377 struct object *obj;
378 if (e->item == &(one->object)) {
380 /*
381 * Need to include e->name as an
382 * independent ref to the pack-objects
383 * input, so that the tag is included
384 * in the output; otherwise we would
385 * end up triggering "empty bundle"
386 * error.
387 */
388 obj = parse_object_or_die(&oid, e->name);
389 obj->flags |= SHOWN;
390 add_pending_object(revs, obj, e->name);
391 }
392 goto skip_write_ref;
393 }
394 ref_count++;
396 write_or_die(bundle_fd, oid_to_hex(&e->item->oid), 40);
397 write_or_die(bundle_fd, " ", 1);
398 write_or_die(bundle_fd, display_ref, strlen(display_ref));
399 write_or_die(bundle_fd, "\n", 1);
400 skip_write_ref:
401 free(ref);
402 }
403 /* end header */
405 write_or_die(bundle_fd, "\n", 1);
406 return ref_count;
407}
408int create_bundle(struct bundle_header *header, const char *path,
410 int argc, const char **argv)
411{
412 static struct lock_file lock;
413 int bundle_fd = -1;
414 int bundle_to_stdout;
415 int ref_count = 0;
416 struct rev_info revs;
417 bundle_to_stdout = !strcmp(path, "-");
419 if (bundle_to_stdout)
420 bundle_fd = 1;
421 else {
422 bundle_fd = hold_lock_file_for_update(&lock, path,
423 LOCK_DIE_ON_ERROR);
424 /*
426 * write_pack_data() will close the fd passed to it,
427 * but commit_lock_file() will also try to close the
428 * lockfile's fd. So make a copy of the file
429 * descriptor to avoid trying to close it twice.
430 */
431 bundle_fd = dup(bundle_fd);
432 if (bundle_fd < 0)
433 die_errno("unable to dup file descriptor");
434 }
435 /* write signature */
437 write_or_die(bundle_fd, bundle_signature, strlen(bundle_signature));
438 /* init revs to list objects for pack-objects later */
440 save_commit_buffer = 0;
441 init_revisions(&revs, NULL);
442 /* write prerequisites */
444 if (compute_and_write_prerequisites(bundle_fd, &revs, argc, argv))
445 goto err;
446 argc = setup_revisions(argc, argv, &revs, NULL);
448 if (argc > 1) {
450 error(_("unrecognized argument: %s"), argv[1]);
451 goto err;
452 }
453 object_array_remove_duplicates(&revs.pending);
455 ref_count = write_bundle_refs(bundle_fd, &revs);
457 if (!ref_count)
458 die(_("Refusing to create empty bundle."));
459 else if (ref_count < 0)
460 goto err;
461 /* write pack */
463 if (write_pack_data(bundle_fd, &revs)) {
464 bundle_fd = -1; /* already closed by the above call */
465 goto err;
466 }
467 if (!bundle_to_stdout) {
469 if (commit_lock_file(&lock))
470 die_errno(_("cannot create '%s'"), path);
471 }
472 return 0;
473err:
474 if (!bundle_to_stdout) {
475 if (0 <= bundle_fd)
476 close(bundle_fd);
477 rollback_lock_file(&lock);
478 }
479 return -1;
480}
481int unbundle(struct bundle_header *header, int bundle_fd, int flags)
483{
484 const char *argv_index_pack[] = {"index-pack",
485 "--fix-thin", "--stdin", NULL, NULL};
486 struct child_process ip = CHILD_PROCESS_INIT;
487 if (flags & BUNDLE_VERBOSE)
489 argv_index_pack[3] = "-v";
490 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;
500}