Merge branch 'jt/fetch-pack-wanted-refs-optim'
[git/git.git] / fetch-pack.c
1 #include "cache.h"
2 #include "repository.h"
3 #include "config.h"
4 #include "lockfile.h"
5 #include "refs.h"
6 #include "pkt-line.h"
7 #include "commit.h"
8 #include "tag.h"
9 #include "exec-cmd.h"
10 #include "pack.h"
11 #include "sideband.h"
12 #include "fetch-pack.h"
13 #include "remote.h"
14 #include "run-command.h"
15 #include "connect.h"
16 #include "transport.h"
17 #include "version.h"
18 #include "sha1-array.h"
19 #include "oidset.h"
20 #include "packfile.h"
21 #include "object-store.h"
22 #include "connected.h"
23 #include "fetch-negotiator.h"
24 #include "fsck.h"
25
26 static int transfer_unpack_limit = -1;
27 static int fetch_unpack_limit = -1;
28 static int unpack_limit = 100;
29 static int prefer_ofs_delta = 1;
30 static int no_done;
31 static int deepen_since_ok;
32 static int deepen_not_ok;
33 static int fetch_fsck_objects = -1;
34 static int transfer_fsck_objects = -1;
35 static int agent_supported;
36 static int server_supports_filtering;
37 static struct lock_file shallow_lock;
38 static const char *alternate_shallow_file;
39 static char *negotiation_algorithm;
40 static struct strbuf fsck_msg_types = STRBUF_INIT;
41
42 /* Remember to update object flag allocation in object.h */
43 #define COMPLETE (1U << 0)
44 #define ALTERNATE (1U << 1)
45
46 /*
47 * After sending this many "have"s if we do not get any new ACK , we
48 * give up traversing our history.
49 */
50 #define MAX_IN_VAIN 256
51
52 static int multi_ack, use_sideband;
53 /* Allow specifying sha1 if it is a ref tip. */
54 #define ALLOW_TIP_SHA1 01
55 /* Allow request of a sha1 if it is reachable from a ref (possibly hidden ref). */
56 #define ALLOW_REACHABLE_SHA1 02
57 static unsigned int allow_unadvertised_object_request;
58
59 __attribute__((format (printf, 2, 3)))
60 static inline void print_verbose(const struct fetch_pack_args *args,
61 const char *fmt, ...)
62 {
63 va_list params;
64
65 if (!args->verbose)
66 return;
67
68 va_start(params, fmt);
69 vfprintf(stderr, fmt, params);
70 va_end(params);
71 fputc('\n', stderr);
72 }
73
74 struct alternate_object_cache {
75 struct object **items;
76 size_t nr, alloc;
77 };
78
79 static void cache_one_alternate(const struct object_id *oid,
80 void *vcache)
81 {
82 struct alternate_object_cache *cache = vcache;
83 struct object *obj = parse_object(the_repository, oid);
84
85 if (!obj || (obj->flags & ALTERNATE))
86 return;
87
88 obj->flags |= ALTERNATE;
89 ALLOC_GROW(cache->items, cache->nr + 1, cache->alloc);
90 cache->items[cache->nr++] = obj;
91 }
92
93 static void for_each_cached_alternate(struct fetch_negotiator *negotiator,
94 void (*cb)(struct fetch_negotiator *,
95 struct object *))
96 {
97 static int initialized;
98 static struct alternate_object_cache cache;
99 size_t i;
100
101 if (!initialized) {
102 for_each_alternate_ref(cache_one_alternate, &cache);
103 initialized = 1;
104 }
105
106 for (i = 0; i < cache.nr; i++)
107 cb(negotiator, cache.items[i]);
108 }
109
110 static int rev_list_insert_ref(struct fetch_negotiator *negotiator,
111 const char *refname,
112 const struct object_id *oid)
113 {
114 struct object *o = deref_tag(the_repository,
115 parse_object(the_repository, oid),
116 refname, 0);
117
118 if (o && o->type == OBJ_COMMIT)
119 negotiator->add_tip(negotiator, (struct commit *)o);
120
121 return 0;
122 }
123
124 static int rev_list_insert_ref_oid(const char *refname, const struct object_id *oid,
125 int flag, void *cb_data)
126 {
127 return rev_list_insert_ref(cb_data, refname, oid);
128 }
129
130 enum ack_type {
131 NAK = 0,
132 ACK,
133 ACK_continue,
134 ACK_common,
135 ACK_ready
136 };
137
138 static void consume_shallow_list(struct fetch_pack_args *args,
139 struct packet_reader *reader)
140 {
141 if (args->stateless_rpc && args->deepen) {
142 /* If we sent a depth we will get back "duplicate"
143 * shallow and unshallow commands every time there
144 * is a block of have lines exchanged.
145 */
146 while (packet_reader_read(reader) == PACKET_READ_NORMAL) {
147 if (starts_with(reader->line, "shallow "))
148 continue;
149 if (starts_with(reader->line, "unshallow "))
150 continue;
151 die(_("git fetch-pack: expected shallow list"));
152 }
153 if (reader->status != PACKET_READ_FLUSH)
154 die(_("git fetch-pack: expected a flush packet after shallow list"));
155 }
156 }
157
158 static enum ack_type get_ack(struct packet_reader *reader,
159 struct object_id *result_oid)
160 {
161 int len;
162 const char *arg;
163
164 if (packet_reader_read(reader) != PACKET_READ_NORMAL)
165 die(_("git fetch-pack: expected ACK/NAK, got a flush packet"));
166 len = reader->pktlen;
167
168 if (!strcmp(reader->line, "NAK"))
169 return NAK;
170 if (skip_prefix(reader->line, "ACK ", &arg)) {
171 if (!get_oid_hex(arg, result_oid)) {
172 arg += 40;
173 len -= arg - reader->line;
174 if (len < 1)
175 return ACK;
176 if (strstr(arg, "continue"))
177 return ACK_continue;
178 if (strstr(arg, "common"))
179 return ACK_common;
180 if (strstr(arg, "ready"))
181 return ACK_ready;
182 return ACK;
183 }
184 }
185 die(_("git fetch-pack: expected ACK/NAK, got '%s'"), reader->line);
186 }
187
188 static void send_request(struct fetch_pack_args *args,
189 int fd, struct strbuf *buf)
190 {
191 if (args->stateless_rpc) {
192 send_sideband(fd, -1, buf->buf, buf->len, LARGE_PACKET_MAX);
193 packet_flush(fd);
194 } else {
195 if (write_in_full(fd, buf->buf, buf->len) < 0)
196 die_errno(_("unable to write to remote"));
197 }
198 }
199
200 static void insert_one_alternate_object(struct fetch_negotiator *negotiator,
201 struct object *obj)
202 {
203 rev_list_insert_ref(negotiator, NULL, &obj->oid);
204 }
205
206 #define INITIAL_FLUSH 16
207 #define PIPESAFE_FLUSH 32
208 #define LARGE_FLUSH 16384
209
210 static int next_flush(int stateless_rpc, int count)
211 {
212 if (stateless_rpc) {
213 if (count < LARGE_FLUSH)
214 count <<= 1;
215 else
216 count = count * 11 / 10;
217 } else {
218 if (count < PIPESAFE_FLUSH)
219 count <<= 1;
220 else
221 count += PIPESAFE_FLUSH;
222 }
223 return count;
224 }
225
226 static void mark_tips(struct fetch_negotiator *negotiator,
227 const struct oid_array *negotiation_tips)
228 {
229 int i;
230
231 if (!negotiation_tips) {
232 for_each_ref(rev_list_insert_ref_oid, negotiator);
233 return;
234 }
235
236 for (i = 0; i < negotiation_tips->nr; i++)
237 rev_list_insert_ref(negotiator, NULL,
238 &negotiation_tips->oid[i]);
239 return;
240 }
241
242 static int find_common(struct fetch_negotiator *negotiator,
243 struct fetch_pack_args *args,
244 int fd[2], struct object_id *result_oid,
245 struct ref *refs)
246 {
247 int fetching;
248 int count = 0, flushes = 0, flush_at = INITIAL_FLUSH, retval;
249 const struct object_id *oid;
250 unsigned in_vain = 0;
251 int got_continue = 0;
252 int got_ready = 0;
253 struct strbuf req_buf = STRBUF_INIT;
254 size_t state_len = 0;
255 struct packet_reader reader;
256
257 if (args->stateless_rpc && multi_ack == 1)
258 die(_("--stateless-rpc requires multi_ack_detailed"));
259
260 packet_reader_init(&reader, fd[0], NULL, 0,
261 PACKET_READ_CHOMP_NEWLINE |
262 PACKET_READ_DIE_ON_ERR_PACKET);
263
264 if (!args->no_dependents) {
265 mark_tips(negotiator, args->negotiation_tips);
266 for_each_cached_alternate(negotiator, insert_one_alternate_object);
267 }
268
269 fetching = 0;
270 for ( ; refs ; refs = refs->next) {
271 struct object_id *remote = &refs->old_oid;
272 const char *remote_hex;
273 struct object *o;
274
275 /*
276 * If that object is complete (i.e. it is an ancestor of a
277 * local ref), we tell them we have it but do not have to
278 * tell them about its ancestors, which they already know
279 * about.
280 *
281 * We use lookup_object here because we are only
282 * interested in the case we *know* the object is
283 * reachable and we have already scanned it.
284 *
285 * Do this only if args->no_dependents is false (if it is true,
286 * we cannot trust the object flags).
287 */
288 if (!args->no_dependents &&
289 ((o = lookup_object(the_repository, remote->hash)) != NULL) &&
290 (o->flags & COMPLETE)) {
291 continue;
292 }
293
294 remote_hex = oid_to_hex(remote);
295 if (!fetching) {
296 struct strbuf c = STRBUF_INIT;
297 if (multi_ack == 2) strbuf_addstr(&c, " multi_ack_detailed");
298 if (multi_ack == 1) strbuf_addstr(&c, " multi_ack");
299 if (no_done) strbuf_addstr(&c, " no-done");
300 if (use_sideband == 2) strbuf_addstr(&c, " side-band-64k");
301 if (use_sideband == 1) strbuf_addstr(&c, " side-band");
302 if (args->deepen_relative) strbuf_addstr(&c, " deepen-relative");
303 if (args->use_thin_pack) strbuf_addstr(&c, " thin-pack");
304 if (args->no_progress) strbuf_addstr(&c, " no-progress");
305 if (args->include_tag) strbuf_addstr(&c, " include-tag");
306 if (prefer_ofs_delta) strbuf_addstr(&c, " ofs-delta");
307 if (deepen_since_ok) strbuf_addstr(&c, " deepen-since");
308 if (deepen_not_ok) strbuf_addstr(&c, " deepen-not");
309 if (agent_supported) strbuf_addf(&c, " agent=%s",
310 git_user_agent_sanitized());
311 if (args->filter_options.choice)
312 strbuf_addstr(&c, " filter");
313 packet_buf_write(&req_buf, "want %s%s\n", remote_hex, c.buf);
314 strbuf_release(&c);
315 } else
316 packet_buf_write(&req_buf, "want %s\n", remote_hex);
317 fetching++;
318 }
319
320 if (!fetching) {
321 strbuf_release(&req_buf);
322 packet_flush(fd[1]);
323 return 1;
324 }
325
326 if (is_repository_shallow(the_repository))
327 write_shallow_commits(&req_buf, 1, NULL);
328 if (args->depth > 0)
329 packet_buf_write(&req_buf, "deepen %d", args->depth);
330 if (args->deepen_since) {
331 timestamp_t max_age = approxidate(args->deepen_since);
332 packet_buf_write(&req_buf, "deepen-since %"PRItime, max_age);
333 }
334 if (args->deepen_not) {
335 int i;
336 for (i = 0; i < args->deepen_not->nr; i++) {
337 struct string_list_item *s = args->deepen_not->items + i;
338 packet_buf_write(&req_buf, "deepen-not %s", s->string);
339 }
340 }
341 if (server_supports_filtering && args->filter_options.choice) {
342 struct strbuf expanded_filter_spec = STRBUF_INIT;
343 expand_list_objects_filter_spec(&args->filter_options,
344 &expanded_filter_spec);
345 packet_buf_write(&req_buf, "filter %s",
346 expanded_filter_spec.buf);
347 strbuf_release(&expanded_filter_spec);
348 }
349 packet_buf_flush(&req_buf);
350 state_len = req_buf.len;
351
352 if (args->deepen) {
353 const char *arg;
354 struct object_id oid;
355
356 send_request(args, fd[1], &req_buf);
357 while (packet_reader_read(&reader) == PACKET_READ_NORMAL) {
358 if (skip_prefix(reader.line, "shallow ", &arg)) {
359 if (get_oid_hex(arg, &oid))
360 die(_("invalid shallow line: %s"), reader.line);
361 register_shallow(the_repository, &oid);
362 continue;
363 }
364 if (skip_prefix(reader.line, "unshallow ", &arg)) {
365 if (get_oid_hex(arg, &oid))
366 die(_("invalid unshallow line: %s"), reader.line);
367 if (!lookup_object(the_repository, oid.hash))
368 die(_("object not found: %s"), reader.line);
369 /* make sure that it is parsed as shallow */
370 if (!parse_object(the_repository, &oid))
371 die(_("error in object: %s"), reader.line);
372 if (unregister_shallow(&oid))
373 die(_("no shallow found: %s"), reader.line);
374 continue;
375 }
376 die(_("expected shallow/unshallow, got %s"), reader.line);
377 }
378 } else if (!args->stateless_rpc)
379 send_request(args, fd[1], &req_buf);
380
381 if (!args->stateless_rpc) {
382 /* If we aren't using the stateless-rpc interface
383 * we don't need to retain the headers.
384 */
385 strbuf_setlen(&req_buf, 0);
386 state_len = 0;
387 }
388
389 flushes = 0;
390 retval = -1;
391 if (args->no_dependents)
392 goto done;
393 while ((oid = negotiator->next(negotiator))) {
394 packet_buf_write(&req_buf, "have %s\n", oid_to_hex(oid));
395 print_verbose(args, "have %s", oid_to_hex(oid));
396 in_vain++;
397 if (flush_at <= ++count) {
398 int ack;
399
400 packet_buf_flush(&req_buf);
401 send_request(args, fd[1], &req_buf);
402 strbuf_setlen(&req_buf, state_len);
403 flushes++;
404 flush_at = next_flush(args->stateless_rpc, count);
405
406 /*
407 * We keep one window "ahead" of the other side, and
408 * will wait for an ACK only on the next one
409 */
410 if (!args->stateless_rpc && count == INITIAL_FLUSH)
411 continue;
412
413 consume_shallow_list(args, &reader);
414 do {
415 ack = get_ack(&reader, result_oid);
416 if (ack)
417 print_verbose(args, _("got %s %d %s"), "ack",
418 ack, oid_to_hex(result_oid));
419 switch (ack) {
420 case ACK:
421 flushes = 0;
422 multi_ack = 0;
423 retval = 0;
424 goto done;
425 case ACK_common:
426 case ACK_ready:
427 case ACK_continue: {
428 struct commit *commit =
429 lookup_commit(the_repository,
430 result_oid);
431 int was_common;
432
433 if (!commit)
434 die(_("invalid commit %s"), oid_to_hex(result_oid));
435 was_common = negotiator->ack(negotiator, commit);
436 if (args->stateless_rpc
437 && ack == ACK_common
438 && !was_common) {
439 /* We need to replay the have for this object
440 * on the next RPC request so the peer knows
441 * it is in common with us.
442 */
443 const char *hex = oid_to_hex(result_oid);
444 packet_buf_write(&req_buf, "have %s\n", hex);
445 state_len = req_buf.len;
446 /*
447 * Reset in_vain because an ack
448 * for this commit has not been
449 * seen.
450 */
451 in_vain = 0;
452 } else if (!args->stateless_rpc
453 || ack != ACK_common)
454 in_vain = 0;
455 retval = 0;
456 got_continue = 1;
457 if (ack == ACK_ready)
458 got_ready = 1;
459 break;
460 }
461 }
462 } while (ack);
463 flushes--;
464 if (got_continue && MAX_IN_VAIN < in_vain) {
465 print_verbose(args, _("giving up"));
466 break; /* give up */
467 }
468 if (got_ready)
469 break;
470 }
471 }
472 done:
473 if (!got_ready || !no_done) {
474 packet_buf_write(&req_buf, "done\n");
475 send_request(args, fd[1], &req_buf);
476 }
477 print_verbose(args, _("done"));
478 if (retval != 0) {
479 multi_ack = 0;
480 flushes++;
481 }
482 strbuf_release(&req_buf);
483
484 if (!got_ready || !no_done)
485 consume_shallow_list(args, &reader);
486 while (flushes || multi_ack) {
487 int ack = get_ack(&reader, result_oid);
488 if (ack) {
489 print_verbose(args, _("got %s (%d) %s"), "ack",
490 ack, oid_to_hex(result_oid));
491 if (ack == ACK)
492 return 0;
493 multi_ack = 1;
494 continue;
495 }
496 flushes--;
497 }
498 /* it is no error to fetch into a completely empty repo */
499 return count ? retval : 0;
500 }
501
502 static struct commit_list *complete;
503
504 static int mark_complete(const struct object_id *oid)
505 {
506 struct object *o = parse_object(the_repository, oid);
507
508 while (o && o->type == OBJ_TAG) {
509 struct tag *t = (struct tag *) o;
510 if (!t->tagged)
511 break; /* broken repository */
512 o->flags |= COMPLETE;
513 o = parse_object(the_repository, &t->tagged->oid);
514 }
515 if (o && o->type == OBJ_COMMIT) {
516 struct commit *commit = (struct commit *)o;
517 if (!(commit->object.flags & COMPLETE)) {
518 commit->object.flags |= COMPLETE;
519 commit_list_insert(commit, &complete);
520 }
521 }
522 return 0;
523 }
524
525 static int mark_complete_oid(const char *refname, const struct object_id *oid,
526 int flag, void *cb_data)
527 {
528 return mark_complete(oid);
529 }
530
531 static void mark_recent_complete_commits(struct fetch_pack_args *args,
532 timestamp_t cutoff)
533 {
534 while (complete && cutoff <= complete->item->date) {
535 print_verbose(args, _("Marking %s as complete"),
536 oid_to_hex(&complete->item->object.oid));
537 pop_most_recent_commit(&complete, COMPLETE);
538 }
539 }
540
541 static void add_refs_to_oidset(struct oidset *oids, struct ref *refs)
542 {
543 for (; refs; refs = refs->next)
544 oidset_insert(oids, &refs->old_oid);
545 }
546
547 static int is_unmatched_ref(const struct ref *ref)
548 {
549 struct object_id oid;
550 const char *p;
551 return ref->match_status == REF_NOT_MATCHED &&
552 !parse_oid_hex(ref->name, &oid, &p) &&
553 *p == '\0' &&
554 oideq(&oid, &ref->old_oid);
555 }
556
557 static void filter_refs(struct fetch_pack_args *args,
558 struct ref **refs,
559 struct ref **sought, int nr_sought)
560 {
561 struct ref *newlist = NULL;
562 struct ref **newtail = &newlist;
563 struct ref *unmatched = NULL;
564 struct ref *ref, *next;
565 struct oidset tip_oids = OIDSET_INIT;
566 int i;
567 int strict = !(allow_unadvertised_object_request &
568 (ALLOW_TIP_SHA1 | ALLOW_REACHABLE_SHA1));
569
570 i = 0;
571 for (ref = *refs; ref; ref = next) {
572 int keep = 0;
573 next = ref->next;
574
575 if (starts_with(ref->name, "refs/") &&
576 check_refname_format(ref->name, 0))
577 ; /* trash */
578 else {
579 while (i < nr_sought) {
580 int cmp = strcmp(ref->name, sought[i]->name);
581 if (cmp < 0)
582 break; /* definitely do not have it */
583 else if (cmp == 0) {
584 keep = 1; /* definitely have it */
585 sought[i]->match_status = REF_MATCHED;
586 }
587 i++;
588 }
589
590 if (!keep && args->fetch_all &&
591 (!args->deepen || !starts_with(ref->name, "refs/tags/")))
592 keep = 1;
593 }
594
595 if (keep) {
596 *newtail = ref;
597 ref->next = NULL;
598 newtail = &ref->next;
599 } else {
600 ref->next = unmatched;
601 unmatched = ref;
602 }
603 }
604
605 if (strict) {
606 for (i = 0; i < nr_sought; i++) {
607 ref = sought[i];
608 if (!is_unmatched_ref(ref))
609 continue;
610
611 add_refs_to_oidset(&tip_oids, unmatched);
612 add_refs_to_oidset(&tip_oids, newlist);
613 break;
614 }
615 }
616
617 /* Append unmatched requests to the list */
618 for (i = 0; i < nr_sought; i++) {
619 ref = sought[i];
620 if (!is_unmatched_ref(ref))
621 continue;
622
623 if (!strict || oidset_contains(&tip_oids, &ref->old_oid)) {
624 ref->match_status = REF_MATCHED;
625 *newtail = copy_ref(ref);
626 newtail = &(*newtail)->next;
627 } else {
628 ref->match_status = REF_UNADVERTISED_NOT_ALLOWED;
629 }
630 }
631
632 oidset_clear(&tip_oids);
633 for (ref = unmatched; ref; ref = next) {
634 next = ref->next;
635 free(ref);
636 }
637
638 *refs = newlist;
639 }
640
641 static void mark_alternate_complete(struct fetch_negotiator *unused,
642 struct object *obj)
643 {
644 mark_complete(&obj->oid);
645 }
646
647 struct loose_object_iter {
648 struct oidset *loose_object_set;
649 struct ref *refs;
650 };
651
652 /*
653 * Mark recent commits available locally and reachable from a local ref as
654 * COMPLETE. If args->no_dependents is false, also mark COMPLETE remote refs as
655 * COMMON_REF (otherwise, we are not planning to participate in negotiation, and
656 * thus do not need COMMON_REF marks).
657 *
658 * The cutoff time for recency is determined by this heuristic: it is the
659 * earliest commit time of the objects in refs that are commits and that we know
660 * the commit time of.
661 */
662 static void mark_complete_and_common_ref(struct fetch_negotiator *negotiator,
663 struct fetch_pack_args *args,
664 struct ref **refs)
665 {
666 struct ref *ref;
667 int old_save_commit_buffer = save_commit_buffer;
668 timestamp_t cutoff = 0;
669
670 save_commit_buffer = 0;
671
672 for (ref = *refs; ref; ref = ref->next) {
673 struct object *o;
674
675 if (!has_object_file_with_flags(&ref->old_oid,
676 OBJECT_INFO_QUICK))
677 continue;
678 o = parse_object(the_repository, &ref->old_oid);
679 if (!o)
680 continue;
681
682 /* We already have it -- which may mean that we were
683 * in sync with the other side at some time after
684 * that (it is OK if we guess wrong here).
685 */
686 if (o->type == OBJ_COMMIT) {
687 struct commit *commit = (struct commit *)o;
688 if (!cutoff || cutoff < commit->date)
689 cutoff = commit->date;
690 }
691 }
692
693 if (!args->deepen) {
694 for_each_ref(mark_complete_oid, NULL);
695 for_each_cached_alternate(NULL, mark_alternate_complete);
696 commit_list_sort_by_date(&complete);
697 if (cutoff)
698 mark_recent_complete_commits(args, cutoff);
699 }
700
701 /*
702 * Mark all complete remote refs as common refs.
703 * Don't mark them common yet; the server has to be told so first.
704 */
705 for (ref = *refs; ref; ref = ref->next) {
706 struct object *o = deref_tag(the_repository,
707 lookup_object(the_repository,
708 ref->old_oid.hash),
709 NULL, 0);
710
711 if (!o || o->type != OBJ_COMMIT || !(o->flags & COMPLETE))
712 continue;
713
714 negotiator->known_common(negotiator,
715 (struct commit *)o);
716 }
717
718 save_commit_buffer = old_save_commit_buffer;
719 }
720
721 /*
722 * Returns 1 if every object pointed to by the given remote refs is available
723 * locally and reachable from a local ref, and 0 otherwise.
724 */
725 static int everything_local(struct fetch_pack_args *args,
726 struct ref **refs)
727 {
728 struct ref *ref;
729 int retval;
730
731 for (retval = 1, ref = *refs; ref ; ref = ref->next) {
732 const struct object_id *remote = &ref->old_oid;
733 struct object *o;
734
735 o = lookup_object(the_repository, remote->hash);
736 if (!o || !(o->flags & COMPLETE)) {
737 retval = 0;
738 print_verbose(args, "want %s (%s)", oid_to_hex(remote),
739 ref->name);
740 continue;
741 }
742 print_verbose(args, _("already have %s (%s)"), oid_to_hex(remote),
743 ref->name);
744 }
745
746 return retval;
747 }
748
749 static int sideband_demux(int in, int out, void *data)
750 {
751 int *xd = data;
752 int ret;
753
754 ret = recv_sideband("fetch-pack", xd[0], out);
755 close(out);
756 return ret;
757 }
758
759 static int get_pack(struct fetch_pack_args *args,
760 int xd[2], char **pack_lockfile)
761 {
762 struct async demux;
763 int do_keep = args->keep_pack;
764 const char *cmd_name;
765 struct pack_header header;
766 int pass_header = 0;
767 struct child_process cmd = CHILD_PROCESS_INIT;
768 int ret;
769
770 memset(&demux, 0, sizeof(demux));
771 if (use_sideband) {
772 /* xd[] is talking with upload-pack; subprocess reads from
773 * xd[0], spits out band#2 to stderr, and feeds us band#1
774 * through demux->out.
775 */
776 demux.proc = sideband_demux;
777 demux.data = xd;
778 demux.out = -1;
779 demux.isolate_sigpipe = 1;
780 if (start_async(&demux))
781 die(_("fetch-pack: unable to fork off sideband demultiplexer"));
782 }
783 else
784 demux.out = xd[0];
785
786 if (!args->keep_pack && unpack_limit) {
787
788 if (read_pack_header(demux.out, &header))
789 die(_("protocol error: bad pack header"));
790 pass_header = 1;
791 if (ntohl(header.hdr_entries) < unpack_limit)
792 do_keep = 0;
793 else
794 do_keep = 1;
795 }
796
797 if (alternate_shallow_file) {
798 argv_array_push(&cmd.args, "--shallow-file");
799 argv_array_push(&cmd.args, alternate_shallow_file);
800 }
801
802 if (do_keep || args->from_promisor) {
803 if (pack_lockfile)
804 cmd.out = -1;
805 cmd_name = "index-pack";
806 argv_array_push(&cmd.args, cmd_name);
807 argv_array_push(&cmd.args, "--stdin");
808 if (!args->quiet && !args->no_progress)
809 argv_array_push(&cmd.args, "-v");
810 if (args->use_thin_pack)
811 argv_array_push(&cmd.args, "--fix-thin");
812 if (do_keep && (args->lock_pack || unpack_limit)) {
813 char hostname[HOST_NAME_MAX + 1];
814 if (xgethostname(hostname, sizeof(hostname)))
815 xsnprintf(hostname, sizeof(hostname), "localhost");
816 argv_array_pushf(&cmd.args,
817 "--keep=fetch-pack %"PRIuMAX " on %s",
818 (uintmax_t)getpid(), hostname);
819 }
820 if (args->check_self_contained_and_connected)
821 argv_array_push(&cmd.args, "--check-self-contained-and-connected");
822 if (args->from_promisor)
823 argv_array_push(&cmd.args, "--promisor");
824 }
825 else {
826 cmd_name = "unpack-objects";
827 argv_array_push(&cmd.args, cmd_name);
828 if (args->quiet || args->no_progress)
829 argv_array_push(&cmd.args, "-q");
830 args->check_self_contained_and_connected = 0;
831 }
832
833 if (pass_header)
834 argv_array_pushf(&cmd.args, "--pack_header=%"PRIu32",%"PRIu32,
835 ntohl(header.hdr_version),
836 ntohl(header.hdr_entries));
837 if (fetch_fsck_objects >= 0
838 ? fetch_fsck_objects
839 : transfer_fsck_objects >= 0
840 ? transfer_fsck_objects
841 : 0) {
842 if (args->from_promisor)
843 /*
844 * We cannot use --strict in index-pack because it
845 * checks both broken objects and links, but we only
846 * want to check for broken objects.
847 */
848 argv_array_push(&cmd.args, "--fsck-objects");
849 else
850 argv_array_pushf(&cmd.args, "--strict%s",
851 fsck_msg_types.buf);
852 }
853
854 cmd.in = demux.out;
855 cmd.git_cmd = 1;
856 if (start_command(&cmd))
857 die(_("fetch-pack: unable to fork off %s"), cmd_name);
858 if (do_keep && pack_lockfile) {
859 *pack_lockfile = index_pack_lockfile(cmd.out);
860 close(cmd.out);
861 }
862
863 if (!use_sideband)
864 /* Closed by start_command() */
865 xd[0] = -1;
866
867 ret = finish_command(&cmd);
868 if (!ret || (args->check_self_contained_and_connected && ret == 1))
869 args->self_contained_and_connected =
870 args->check_self_contained_and_connected &&
871 ret == 0;
872 else
873 die(_("%s failed"), cmd_name);
874 if (use_sideband && finish_async(&demux))
875 die(_("error in sideband demultiplexer"));
876 return 0;
877 }
878
879 static int cmp_ref_by_name(const void *a_, const void *b_)
880 {
881 const struct ref *a = *((const struct ref **)a_);
882 const struct ref *b = *((const struct ref **)b_);
883 return strcmp(a->name, b->name);
884 }
885
886 static struct ref *do_fetch_pack(struct fetch_pack_args *args,
887 int fd[2],
888 const struct ref *orig_ref,
889 struct ref **sought, int nr_sought,
890 struct shallow_info *si,
891 char **pack_lockfile)
892 {
893 struct ref *ref = copy_ref_list(orig_ref);
894 struct object_id oid;
895 const char *agent_feature;
896 int agent_len;
897 struct fetch_negotiator negotiator;
898 fetch_negotiator_init(&negotiator, negotiation_algorithm);
899
900 sort_ref_list(&ref, ref_compare_name);
901 QSORT(sought, nr_sought, cmp_ref_by_name);
902
903 if ((args->depth > 0 || is_repository_shallow(the_repository)) && !server_supports("shallow"))
904 die(_("Server does not support shallow clients"));
905 if (args->depth > 0 || args->deepen_since || args->deepen_not)
906 args->deepen = 1;
907 if (server_supports("multi_ack_detailed")) {
908 print_verbose(args, _("Server supports multi_ack_detailed"));
909 multi_ack = 2;
910 if (server_supports("no-done")) {
911 print_verbose(args, _("Server supports no-done"));
912 if (args->stateless_rpc)
913 no_done = 1;
914 }
915 }
916 else if (server_supports("multi_ack")) {
917 print_verbose(args, _("Server supports multi_ack"));
918 multi_ack = 1;
919 }
920 if (server_supports("side-band-64k")) {
921 print_verbose(args, _("Server supports side-band-64k"));
922 use_sideband = 2;
923 }
924 else if (server_supports("side-band")) {
925 print_verbose(args, _("Server supports side-band"));
926 use_sideband = 1;
927 }
928 if (server_supports("allow-tip-sha1-in-want")) {
929 print_verbose(args, _("Server supports allow-tip-sha1-in-want"));
930 allow_unadvertised_object_request |= ALLOW_TIP_SHA1;
931 }
932 if (server_supports("allow-reachable-sha1-in-want")) {
933 print_verbose(args, _("Server supports allow-reachable-sha1-in-want"));
934 allow_unadvertised_object_request |= ALLOW_REACHABLE_SHA1;
935 }
936 if (!server_supports("thin-pack"))
937 args->use_thin_pack = 0;
938 if (!server_supports("no-progress"))
939 args->no_progress = 0;
940 if (!server_supports("include-tag"))
941 args->include_tag = 0;
942 if (server_supports("ofs-delta"))
943 print_verbose(args, _("Server supports ofs-delta"));
944 else
945 prefer_ofs_delta = 0;
946
947 if (server_supports("filter")) {
948 server_supports_filtering = 1;
949 print_verbose(args, _("Server supports filter"));
950 } else if (args->filter_options.choice) {
951 warning("filtering not recognized by server, ignoring");
952 }
953
954 if ((agent_feature = server_feature_value("agent", &agent_len))) {
955 agent_supported = 1;
956 if (agent_len)
957 print_verbose(args, _("Server version is %.*s"),
958 agent_len, agent_feature);
959 }
960 if (server_supports("deepen-since"))
961 deepen_since_ok = 1;
962 else if (args->deepen_since)
963 die(_("Server does not support --shallow-since"));
964 if (server_supports("deepen-not"))
965 deepen_not_ok = 1;
966 else if (args->deepen_not)
967 die(_("Server does not support --shallow-exclude"));
968 if (!server_supports("deepen-relative") && args->deepen_relative)
969 die(_("Server does not support --deepen"));
970
971 if (!args->no_dependents) {
972 mark_complete_and_common_ref(&negotiator, args, &ref);
973 filter_refs(args, &ref, sought, nr_sought);
974 if (everything_local(args, &ref)) {
975 packet_flush(fd[1]);
976 goto all_done;
977 }
978 } else {
979 filter_refs(args, &ref, sought, nr_sought);
980 }
981 if (find_common(&negotiator, args, fd, &oid, ref) < 0)
982 if (!args->keep_pack)
983 /* When cloning, it is not unusual to have
984 * no common commit.
985 */
986 warning(_("no common commits"));
987
988 if (args->stateless_rpc)
989 packet_flush(fd[1]);
990 if (args->deepen)
991 setup_alternate_shallow(&shallow_lock, &alternate_shallow_file,
992 NULL);
993 else if (si->nr_ours || si->nr_theirs)
994 alternate_shallow_file = setup_temporary_shallow(si->shallow);
995 else
996 alternate_shallow_file = NULL;
997 if (get_pack(args, fd, pack_lockfile))
998 die(_("git fetch-pack: fetch failed."));
999
1000 all_done:
1001 negotiator.release(&negotiator);
1002 return ref;
1003 }
1004
1005 static void add_shallow_requests(struct strbuf *req_buf,
1006 const struct fetch_pack_args *args)
1007 {
1008 if (is_repository_shallow(the_repository))
1009 write_shallow_commits(req_buf, 1, NULL);
1010 if (args->depth > 0)
1011 packet_buf_write(req_buf, "deepen %d", args->depth);
1012 if (args->deepen_since) {
1013 timestamp_t max_age = approxidate(args->deepen_since);
1014 packet_buf_write(req_buf, "deepen-since %"PRItime, max_age);
1015 }
1016 if (args->deepen_not) {
1017 int i;
1018 for (i = 0; i < args->deepen_not->nr; i++) {
1019 struct string_list_item *s = args->deepen_not->items + i;
1020 packet_buf_write(req_buf, "deepen-not %s", s->string);
1021 }
1022 }
1023 if (args->deepen_relative)
1024 packet_buf_write(req_buf, "deepen-relative\n");
1025 }
1026
1027 static void add_wants(int no_dependents, const struct ref *wants, struct strbuf *req_buf)
1028 {
1029 int use_ref_in_want = server_supports_feature("fetch", "ref-in-want", 0);
1030
1031 for ( ; wants ; wants = wants->next) {
1032 const struct object_id *remote = &wants->old_oid;
1033 struct object *o;
1034
1035 /*
1036 * If that object is complete (i.e. it is an ancestor of a
1037 * local ref), we tell them we have it but do not have to
1038 * tell them about its ancestors, which they already know
1039 * about.
1040 *
1041 * We use lookup_object here because we are only
1042 * interested in the case we *know* the object is
1043 * reachable and we have already scanned it.
1044 *
1045 * Do this only if args->no_dependents is false (if it is true,
1046 * we cannot trust the object flags).
1047 */
1048 if (!no_dependents &&
1049 ((o = lookup_object(the_repository, remote->hash)) != NULL) &&
1050 (o->flags & COMPLETE)) {
1051 continue;
1052 }
1053
1054 if (!use_ref_in_want || wants->exact_oid)
1055 packet_buf_write(req_buf, "want %s\n", oid_to_hex(remote));
1056 else
1057 packet_buf_write(req_buf, "want-ref %s\n", wants->name);
1058 }
1059 }
1060
1061 static void add_common(struct strbuf *req_buf, struct oidset *common)
1062 {
1063 struct oidset_iter iter;
1064 const struct object_id *oid;
1065 oidset_iter_init(common, &iter);
1066
1067 while ((oid = oidset_iter_next(&iter))) {
1068 packet_buf_write(req_buf, "have %s\n", oid_to_hex(oid));
1069 }
1070 }
1071
1072 static int add_haves(struct fetch_negotiator *negotiator,
1073 struct strbuf *req_buf,
1074 int *haves_to_send, int *in_vain)
1075 {
1076 int ret = 0;
1077 int haves_added = 0;
1078 const struct object_id *oid;
1079
1080 while ((oid = negotiator->next(negotiator))) {
1081 packet_buf_write(req_buf, "have %s\n", oid_to_hex(oid));
1082 if (++haves_added >= *haves_to_send)
1083 break;
1084 }
1085
1086 *in_vain += haves_added;
1087 if (!haves_added || *in_vain >= MAX_IN_VAIN) {
1088 /* Send Done */
1089 packet_buf_write(req_buf, "done\n");
1090 ret = 1;
1091 }
1092
1093 /* Increase haves to send on next round */
1094 *haves_to_send = next_flush(1, *haves_to_send);
1095
1096 return ret;
1097 }
1098
1099 static int send_fetch_request(struct fetch_negotiator *negotiator, int fd_out,
1100 const struct fetch_pack_args *args,
1101 const struct ref *wants, struct oidset *common,
1102 int *haves_to_send, int *in_vain,
1103 int sideband_all)
1104 {
1105 int ret = 0;
1106 struct strbuf req_buf = STRBUF_INIT;
1107
1108 if (server_supports_v2("fetch", 1))
1109 packet_buf_write(&req_buf, "command=fetch");
1110 if (server_supports_v2("agent", 0))
1111 packet_buf_write(&req_buf, "agent=%s", git_user_agent_sanitized());
1112 if (args->server_options && args->server_options->nr &&
1113 server_supports_v2("server-option", 1)) {
1114 int i;
1115 for (i = 0; i < args->server_options->nr; i++)
1116 packet_write_fmt(fd_out, "server-option=%s",
1117 args->server_options->items[i].string);
1118 }
1119
1120 packet_buf_delim(&req_buf);
1121 if (args->use_thin_pack)
1122 packet_buf_write(&req_buf, "thin-pack");
1123 if (args->no_progress)
1124 packet_buf_write(&req_buf, "no-progress");
1125 if (args->include_tag)
1126 packet_buf_write(&req_buf, "include-tag");
1127 if (prefer_ofs_delta)
1128 packet_buf_write(&req_buf, "ofs-delta");
1129 if (sideband_all)
1130 packet_buf_write(&req_buf, "sideband-all");
1131
1132 /* Add shallow-info and deepen request */
1133 if (server_supports_feature("fetch", "shallow", 0))
1134 add_shallow_requests(&req_buf, args);
1135 else if (is_repository_shallow(the_repository) || args->deepen)
1136 die(_("Server does not support shallow requests"));
1137
1138 /* Add filter */
1139 if (server_supports_feature("fetch", "filter", 0) &&
1140 args->filter_options.choice) {
1141 struct strbuf expanded_filter_spec = STRBUF_INIT;
1142 print_verbose(args, _("Server supports filter"));
1143 expand_list_objects_filter_spec(&args->filter_options,
1144 &expanded_filter_spec);
1145 packet_buf_write(&req_buf, "filter %s",
1146 expanded_filter_spec.buf);
1147 strbuf_release(&expanded_filter_spec);
1148 } else if (args->filter_options.choice) {
1149 warning("filtering not recognized by server, ignoring");
1150 }
1151
1152 /* add wants */
1153 add_wants(args->no_dependents, wants, &req_buf);
1154
1155 if (args->no_dependents) {
1156 packet_buf_write(&req_buf, "done");
1157 ret = 1;
1158 } else {
1159 /* Add all of the common commits we've found in previous rounds */
1160 add_common(&req_buf, common);
1161
1162 /* Add initial haves */
1163 ret = add_haves(negotiator, &req_buf, haves_to_send, in_vain);
1164 }
1165
1166 /* Send request */
1167 packet_buf_flush(&req_buf);
1168 if (write_in_full(fd_out, req_buf.buf, req_buf.len) < 0)
1169 die_errno(_("unable to write request to remote"));
1170
1171 strbuf_release(&req_buf);
1172 return ret;
1173 }
1174
1175 /*
1176 * Processes a section header in a server's response and checks if it matches
1177 * `section`. If the value of `peek` is 1, the header line will be peeked (and
1178 * not consumed); if 0, the line will be consumed and the function will die if
1179 * the section header doesn't match what was expected.
1180 */
1181 static int process_section_header(struct packet_reader *reader,
1182 const char *section, int peek)
1183 {
1184 int ret;
1185
1186 if (packet_reader_peek(reader) != PACKET_READ_NORMAL)
1187 die(_("error reading section header '%s'"), section);
1188
1189 ret = !strcmp(reader->line, section);
1190
1191 if (!peek) {
1192 if (!ret)
1193 die(_("expected '%s', received '%s'"),
1194 section, reader->line);
1195 packet_reader_read(reader);
1196 }
1197
1198 return ret;
1199 }
1200
1201 static int process_acks(struct fetch_negotiator *negotiator,
1202 struct packet_reader *reader,
1203 struct oidset *common)
1204 {
1205 /* received */
1206 int received_ready = 0;
1207 int received_ack = 0;
1208
1209 process_section_header(reader, "acknowledgments", 0);
1210 while (packet_reader_read(reader) == PACKET_READ_NORMAL) {
1211 const char *arg;
1212
1213 if (!strcmp(reader->line, "NAK"))
1214 continue;
1215
1216 if (skip_prefix(reader->line, "ACK ", &arg)) {
1217 struct object_id oid;
1218 if (!get_oid_hex(arg, &oid)) {
1219 struct commit *commit;
1220 oidset_insert(common, &oid);
1221 commit = lookup_commit(the_repository, &oid);
1222 negotiator->ack(negotiator, commit);
1223 }
1224 continue;
1225 }
1226
1227 if (!strcmp(reader->line, "ready")) {
1228 received_ready = 1;
1229 continue;
1230 }
1231
1232 die(_("unexpected acknowledgment line: '%s'"), reader->line);
1233 }
1234
1235 if (reader->status != PACKET_READ_FLUSH &&
1236 reader->status != PACKET_READ_DELIM)
1237 die(_("error processing acks: %d"), reader->status);
1238
1239 /*
1240 * If an "acknowledgments" section is sent, a packfile is sent if and
1241 * only if "ready" was sent in this section. The other sections
1242 * ("shallow-info" and "wanted-refs") are sent only if a packfile is
1243 * sent. Therefore, a DELIM is expected if "ready" is sent, and a FLUSH
1244 * otherwise.
1245 */
1246 if (received_ready && reader->status != PACKET_READ_DELIM)
1247 die(_("expected packfile to be sent after 'ready'"));
1248 if (!received_ready && reader->status != PACKET_READ_FLUSH)
1249 die(_("expected no other sections to be sent after no 'ready'"));
1250
1251 /* return 0 if no common, 1 if there are common, or 2 if ready */
1252 return received_ready ? 2 : (received_ack ? 1 : 0);
1253 }
1254
1255 static void receive_shallow_info(struct fetch_pack_args *args,
1256 struct packet_reader *reader)
1257 {
1258 int line_received = 0;
1259
1260 process_section_header(reader, "shallow-info", 0);
1261 while (packet_reader_read(reader) == PACKET_READ_NORMAL) {
1262 const char *arg;
1263 struct object_id oid;
1264
1265 if (skip_prefix(reader->line, "shallow ", &arg)) {
1266 if (get_oid_hex(arg, &oid))
1267 die(_("invalid shallow line: %s"), reader->line);
1268 register_shallow(the_repository, &oid);
1269 line_received = 1;
1270 continue;
1271 }
1272 if (skip_prefix(reader->line, "unshallow ", &arg)) {
1273 if (get_oid_hex(arg, &oid))
1274 die(_("invalid unshallow line: %s"), reader->line);
1275 if (!lookup_object(the_repository, oid.hash))
1276 die(_("object not found: %s"), reader->line);
1277 /* make sure that it is parsed as shallow */
1278 if (!parse_object(the_repository, &oid))
1279 die(_("error in object: %s"), reader->line);
1280 if (unregister_shallow(&oid))
1281 die(_("no shallow found: %s"), reader->line);
1282 line_received = 1;
1283 continue;
1284 }
1285 die(_("expected shallow/unshallow, got %s"), reader->line);
1286 }
1287
1288 if (reader->status != PACKET_READ_FLUSH &&
1289 reader->status != PACKET_READ_DELIM)
1290 die(_("error processing shallow info: %d"), reader->status);
1291
1292 if (line_received) {
1293 setup_alternate_shallow(&shallow_lock, &alternate_shallow_file,
1294 NULL);
1295 args->deepen = 1;
1296 } else {
1297 alternate_shallow_file = NULL;
1298 }
1299 }
1300
1301 static int cmp_name_ref(const void *name, const void *ref)
1302 {
1303 return strcmp(name, (*(struct ref **)ref)->name);
1304 }
1305
1306 static void receive_wanted_refs(struct packet_reader *reader,
1307 struct ref **sought, int nr_sought)
1308 {
1309 process_section_header(reader, "wanted-refs", 0);
1310 while (packet_reader_read(reader) == PACKET_READ_NORMAL) {
1311 struct object_id oid;
1312 const char *end;
1313 struct ref **found;
1314
1315 if (parse_oid_hex(reader->line, &oid, &end) || *end++ != ' ')
1316 die(_("expected wanted-ref, got '%s'"), reader->line);
1317
1318 found = bsearch(end, sought, nr_sought, sizeof(*sought),
1319 cmp_name_ref);
1320 if (!found)
1321 die(_("unexpected wanted-ref: '%s'"), reader->line);
1322 oidcpy(&(*found)->old_oid, &oid);
1323 }
1324
1325 if (reader->status != PACKET_READ_DELIM)
1326 die(_("error processing wanted refs: %d"), reader->status);
1327 }
1328
1329 enum fetch_state {
1330 FETCH_CHECK_LOCAL = 0,
1331 FETCH_SEND_REQUEST,
1332 FETCH_PROCESS_ACKS,
1333 FETCH_GET_PACK,
1334 FETCH_DONE,
1335 };
1336
1337 static struct ref *do_fetch_pack_v2(struct fetch_pack_args *args,
1338 int fd[2],
1339 const struct ref *orig_ref,
1340 struct ref **sought, int nr_sought,
1341 char **pack_lockfile)
1342 {
1343 struct ref *ref = copy_ref_list(orig_ref);
1344 enum fetch_state state = FETCH_CHECK_LOCAL;
1345 struct oidset common = OIDSET_INIT;
1346 struct packet_reader reader;
1347 int in_vain = 0;
1348 int haves_to_send = INITIAL_FLUSH;
1349 struct fetch_negotiator negotiator;
1350 fetch_negotiator_init(&negotiator, negotiation_algorithm);
1351 packet_reader_init(&reader, fd[0], NULL, 0,
1352 PACKET_READ_CHOMP_NEWLINE |
1353 PACKET_READ_DIE_ON_ERR_PACKET);
1354 if (git_env_bool("GIT_TEST_SIDEBAND_ALL", 1) &&
1355 server_supports_feature("fetch", "sideband-all", 0)) {
1356 reader.use_sideband = 1;
1357 reader.me = "fetch-pack";
1358 }
1359
1360 while (state != FETCH_DONE) {
1361 switch (state) {
1362 case FETCH_CHECK_LOCAL:
1363 sort_ref_list(&ref, ref_compare_name);
1364 QSORT(sought, nr_sought, cmp_ref_by_name);
1365
1366 /* v2 supports these by default */
1367 allow_unadvertised_object_request |= ALLOW_REACHABLE_SHA1;
1368 use_sideband = 2;
1369 if (args->depth > 0 || args->deepen_since || args->deepen_not)
1370 args->deepen = 1;
1371
1372 /* Filter 'ref' by 'sought' and those that aren't local */
1373 if (!args->no_dependents) {
1374 mark_complete_and_common_ref(&negotiator, args, &ref);
1375 filter_refs(args, &ref, sought, nr_sought);
1376 if (everything_local(args, &ref))
1377 state = FETCH_DONE;
1378 else
1379 state = FETCH_SEND_REQUEST;
1380
1381 mark_tips(&negotiator, args->negotiation_tips);
1382 for_each_cached_alternate(&negotiator,
1383 insert_one_alternate_object);
1384 } else {
1385 filter_refs(args, &ref, sought, nr_sought);
1386 state = FETCH_SEND_REQUEST;
1387 }
1388 break;
1389 case FETCH_SEND_REQUEST:
1390 if (send_fetch_request(&negotiator, fd[1], args, ref,
1391 &common,
1392 &haves_to_send, &in_vain,
1393 reader.use_sideband))
1394 state = FETCH_GET_PACK;
1395 else
1396 state = FETCH_PROCESS_ACKS;
1397 break;
1398 case FETCH_PROCESS_ACKS:
1399 /* Process ACKs/NAKs */
1400 switch (process_acks(&negotiator, &reader, &common)) {
1401 case 2:
1402 state = FETCH_GET_PACK;
1403 break;
1404 case 1:
1405 in_vain = 0;
1406 /* fallthrough */
1407 default:
1408 state = FETCH_SEND_REQUEST;
1409 break;
1410 }
1411 break;
1412 case FETCH_GET_PACK:
1413 /* Check for shallow-info section */
1414 if (process_section_header(&reader, "shallow-info", 1))
1415 receive_shallow_info(args, &reader);
1416
1417 if (process_section_header(&reader, "wanted-refs", 1))
1418 receive_wanted_refs(&reader, sought, nr_sought);
1419
1420 /* get the pack */
1421 process_section_header(&reader, "packfile", 0);
1422 if (get_pack(args, fd, pack_lockfile))
1423 die(_("git fetch-pack: fetch failed."));
1424
1425 state = FETCH_DONE;
1426 break;
1427 case FETCH_DONE:
1428 continue;
1429 }
1430 }
1431
1432 negotiator.release(&negotiator);
1433 oidset_clear(&common);
1434 return ref;
1435 }
1436
1437 static int fetch_pack_config_cb(const char *var, const char *value, void *cb)
1438 {
1439 if (strcmp(var, "fetch.fsck.skiplist") == 0) {
1440 const char *path;
1441
1442 if (git_config_pathname(&path, var, value))
1443 return 1;
1444 strbuf_addf(&fsck_msg_types, "%cskiplist=%s",
1445 fsck_msg_types.len ? ',' : '=', path);
1446 free((char *)path);
1447 return 0;
1448 }
1449
1450 if (skip_prefix(var, "fetch.fsck.", &var)) {
1451 if (is_valid_msg_type(var, value))
1452 strbuf_addf(&fsck_msg_types, "%c%s=%s",
1453 fsck_msg_types.len ? ',' : '=', var, value);
1454 else
1455 warning("Skipping unknown msg id '%s'", var);
1456 return 0;
1457 }
1458
1459 return git_default_config(var, value, cb);
1460 }
1461
1462 static void fetch_pack_config(void)
1463 {
1464 git_config_get_int("fetch.unpacklimit", &fetch_unpack_limit);
1465 git_config_get_int("transfer.unpacklimit", &transfer_unpack_limit);
1466 git_config_get_bool("repack.usedeltabaseoffset", &prefer_ofs_delta);
1467 git_config_get_bool("fetch.fsckobjects", &fetch_fsck_objects);
1468 git_config_get_bool("transfer.fsckobjects", &transfer_fsck_objects);
1469 git_config_get_string("fetch.negotiationalgorithm",
1470 &negotiation_algorithm);
1471
1472 git_config(fetch_pack_config_cb, NULL);
1473 }
1474
1475 static void fetch_pack_setup(void)
1476 {
1477 static int did_setup;
1478 if (did_setup)
1479 return;
1480 fetch_pack_config();
1481 if (0 <= transfer_unpack_limit)
1482 unpack_limit = transfer_unpack_limit;
1483 else if (0 <= fetch_unpack_limit)
1484 unpack_limit = fetch_unpack_limit;
1485 did_setup = 1;
1486 }
1487
1488 static int remove_duplicates_in_refs(struct ref **ref, int nr)
1489 {
1490 struct string_list names = STRING_LIST_INIT_NODUP;
1491 int src, dst;
1492
1493 for (src = dst = 0; src < nr; src++) {
1494 struct string_list_item *item;
1495 item = string_list_insert(&names, ref[src]->name);
1496 if (item->util)
1497 continue; /* already have it */
1498 item->util = ref[src];
1499 if (src != dst)
1500 ref[dst] = ref[src];
1501 dst++;
1502 }
1503 for (src = dst; src < nr; src++)
1504 ref[src] = NULL;
1505 string_list_clear(&names, 0);
1506 return dst;
1507 }
1508
1509 static void update_shallow(struct fetch_pack_args *args,
1510 struct ref **sought, int nr_sought,
1511 struct shallow_info *si)
1512 {
1513 struct oid_array ref = OID_ARRAY_INIT;
1514 int *status;
1515 int i;
1516
1517 if (args->deepen && alternate_shallow_file) {
1518 if (*alternate_shallow_file == '\0') { /* --unshallow */
1519 unlink_or_warn(git_path_shallow(the_repository));
1520 rollback_lock_file(&shallow_lock);
1521 } else
1522 commit_lock_file(&shallow_lock);
1523 alternate_shallow_file = NULL;
1524 return;
1525 }
1526
1527 if (!si->shallow || !si->shallow->nr)
1528 return;
1529
1530 if (args->cloning) {
1531 /*
1532 * remote is shallow, but this is a clone, there are
1533 * no objects in repo to worry about. Accept any
1534 * shallow points that exist in the pack (iow in repo
1535 * after get_pack() and reprepare_packed_git())
1536 */
1537 struct oid_array extra = OID_ARRAY_INIT;
1538 struct object_id *oid = si->shallow->oid;
1539 for (i = 0; i < si->shallow->nr; i++)
1540 if (has_object_file(&oid[i]))
1541 oid_array_append(&extra, &oid[i]);
1542 if (extra.nr) {
1543 setup_alternate_shallow(&shallow_lock,
1544 &alternate_shallow_file,
1545 &extra);
1546 commit_lock_file(&shallow_lock);
1547 alternate_shallow_file = NULL;
1548 }
1549 oid_array_clear(&extra);
1550 return;
1551 }
1552
1553 if (!si->nr_ours && !si->nr_theirs)
1554 return;
1555
1556 remove_nonexistent_theirs_shallow(si);
1557 if (!si->nr_ours && !si->nr_theirs)
1558 return;
1559 for (i = 0; i < nr_sought; i++)
1560 oid_array_append(&ref, &sought[i]->old_oid);
1561 si->ref = &ref;
1562
1563 if (args->update_shallow) {
1564 /*
1565 * remote is also shallow, .git/shallow may be updated
1566 * so all refs can be accepted. Make sure we only add
1567 * shallow roots that are actually reachable from new
1568 * refs.
1569 */
1570 struct oid_array extra = OID_ARRAY_INIT;
1571 struct object_id *oid = si->shallow->oid;
1572 assign_shallow_commits_to_refs(si, NULL, NULL);
1573 if (!si->nr_ours && !si->nr_theirs) {
1574 oid_array_clear(&ref);
1575 return;
1576 }
1577 for (i = 0; i < si->nr_ours; i++)
1578 oid_array_append(&extra, &oid[si->ours[i]]);
1579 for (i = 0; i < si->nr_theirs; i++)
1580 oid_array_append(&extra, &oid[si->theirs[i]]);
1581 setup_alternate_shallow(&shallow_lock,
1582 &alternate_shallow_file,
1583 &extra);
1584 commit_lock_file(&shallow_lock);
1585 oid_array_clear(&extra);
1586 oid_array_clear(&ref);
1587 alternate_shallow_file = NULL;
1588 return;
1589 }
1590
1591 /*
1592 * remote is also shallow, check what ref is safe to update
1593 * without updating .git/shallow
1594 */
1595 status = xcalloc(nr_sought, sizeof(*status));
1596 assign_shallow_commits_to_refs(si, NULL, status);
1597 if (si->nr_ours || si->nr_theirs) {
1598 for (i = 0; i < nr_sought; i++)
1599 if (status[i])
1600 sought[i]->status = REF_STATUS_REJECT_SHALLOW;
1601 }
1602 free(status);
1603 oid_array_clear(&ref);
1604 }
1605
1606 static int iterate_ref_map(void *cb_data, struct object_id *oid)
1607 {
1608 struct ref **rm = cb_data;
1609 struct ref *ref = *rm;
1610
1611 if (!ref)
1612 return -1; /* end of the list */
1613 *rm = ref->next;
1614 oidcpy(oid, &ref->old_oid);
1615 return 0;
1616 }
1617
1618 struct ref *fetch_pack(struct fetch_pack_args *args,
1619 int fd[],
1620 const struct ref *ref,
1621 struct ref **sought, int nr_sought,
1622 struct oid_array *shallow,
1623 char **pack_lockfile,
1624 enum protocol_version version)
1625 {
1626 struct ref *ref_cpy;
1627 struct shallow_info si;
1628
1629 fetch_pack_setup();
1630 if (nr_sought)
1631 nr_sought = remove_duplicates_in_refs(sought, nr_sought);
1632
1633 if (args->no_dependents && !args->filter_options.choice) {
1634 /*
1635 * The protocol does not support requesting that only the
1636 * wanted objects be sent, so approximate this by setting a
1637 * "blob:none" filter if no filter is already set. This works
1638 * for all object types: note that wanted blobs will still be
1639 * sent because they are directly specified as a "want".
1640 *
1641 * NEEDSWORK: Add an option in the protocol to request that
1642 * only the wanted objects be sent, and implement it.
1643 */
1644 parse_list_objects_filter(&args->filter_options, "blob:none");
1645 }
1646
1647 if (version != protocol_v2 && !ref) {
1648 packet_flush(fd[1]);
1649 die(_("no matching remote head"));
1650 }
1651 prepare_shallow_info(&si, shallow);
1652 if (version == protocol_v2)
1653 ref_cpy = do_fetch_pack_v2(args, fd, ref, sought, nr_sought,
1654 pack_lockfile);
1655 else
1656 ref_cpy = do_fetch_pack(args, fd, ref, sought, nr_sought,
1657 &si, pack_lockfile);
1658 reprepare_packed_git(the_repository);
1659
1660 if (!args->cloning && args->deepen) {
1661 struct check_connected_options opt = CHECK_CONNECTED_INIT;
1662 struct ref *iterator = ref_cpy;
1663 opt.shallow_file = alternate_shallow_file;
1664 if (args->deepen)
1665 opt.is_deepening_fetch = 1;
1666 if (check_connected(iterate_ref_map, &iterator, &opt)) {
1667 error(_("remote did not send all necessary objects"));
1668 free_refs(ref_cpy);
1669 ref_cpy = NULL;
1670 rollback_lock_file(&shallow_lock);
1671 goto cleanup;
1672 }
1673 args->connectivity_checked = 1;
1674 }
1675
1676 update_shallow(args, sought, nr_sought, &si);
1677 cleanup:
1678 clear_shallow_info(&si);
1679 return ref_cpy;
1680 }
1681
1682 int report_unmatched_refs(struct ref **sought, int nr_sought)
1683 {
1684 int i, ret = 0;
1685
1686 for (i = 0; i < nr_sought; i++) {
1687 if (!sought[i])
1688 continue;
1689 switch (sought[i]->match_status) {
1690 case REF_MATCHED:
1691 continue;
1692 case REF_NOT_MATCHED:
1693 error(_("no such remote ref %s"), sought[i]->name);
1694 break;
1695 case REF_UNADVERTISED_NOT_ALLOWED:
1696 error(_("Server does not allow request for unadvertised object %s"),
1697 sought[i]->name);
1698 break;
1699 }
1700 ret = 1;
1701 }
1702 return ret;
1703 }