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sideband: reverse its dependency on pkt-line
[git.git] / fetch-pack.c
blobee0847e6ae19b88d345b40600d9b3a9b87af892e
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 write_or_die(fd, buf->buf, buf->len);
196 }
197
198 static void insert_one_alternate_object(struct fetch_negotiator *negotiator,
199 struct object *obj)
200 {
201 rev_list_insert_ref(negotiator, NULL, &obj->oid);
202 }
203
204 #define INITIAL_FLUSH 16
205 #define PIPESAFE_FLUSH 32
206 #define LARGE_FLUSH 16384
207
208 static int next_flush(int stateless_rpc, int count)
209 {
210 if (stateless_rpc) {
211 if (count < LARGE_FLUSH)
212 count <<= 1;
213 else
214 count = count * 11 / 10;
215 } else {
216 if (count < PIPESAFE_FLUSH)
217 count <<= 1;
218 else
219 count += PIPESAFE_FLUSH;
220 }
221 return count;
222 }
223
224 static void mark_tips(struct fetch_negotiator *negotiator,
225 const struct oid_array *negotiation_tips)
226 {
227 int i;
228
229 if (!negotiation_tips) {
230 for_each_ref(rev_list_insert_ref_oid, negotiator);
231 return;
232 }
233
234 for (i = 0; i < negotiation_tips->nr; i++)
235 rev_list_insert_ref(negotiator, NULL,
236 &negotiation_tips->oid[i]);
237 return;
238 }
239
240 static int find_common(struct fetch_negotiator *negotiator,
241 struct fetch_pack_args *args,
242 int fd[2], struct object_id *result_oid,
243 struct ref *refs)
244 {
245 int fetching;
246 int count = 0, flushes = 0, flush_at = INITIAL_FLUSH, retval;
247 const struct object_id *oid;
248 unsigned in_vain = 0;
249 int got_continue = 0;
250 int got_ready = 0;
251 struct strbuf req_buf = STRBUF_INIT;
252 size_t state_len = 0;
253 struct packet_reader reader;
254
255 if (args->stateless_rpc && multi_ack == 1)
256 die(_("--stateless-rpc requires multi_ack_detailed"));
257
258 packet_reader_init(&reader, fd[0], NULL, 0,
259 PACKET_READ_CHOMP_NEWLINE |
260 PACKET_READ_DIE_ON_ERR_PACKET);
261
262 if (!args->no_dependents) {
263 mark_tips(negotiator, args->negotiation_tips);
264 for_each_cached_alternate(negotiator, insert_one_alternate_object);
265 }
266
267 fetching = 0;
268 for ( ; refs ; refs = refs->next) {
269 struct object_id *remote = &refs->old_oid;
270 const char *remote_hex;
271 struct object *o;
272
273 /*
274 * If that object is complete (i.e. it is an ancestor of a
275 * local ref), we tell them we have it but do not have to
276 * tell them about its ancestors, which they already know
277 * about.
278 *
279 * We use lookup_object here because we are only
280 * interested in the case we *know* the object is
281 * reachable and we have already scanned it.
282 *
283 * Do this only if args->no_dependents is false (if it is true,
284 * we cannot trust the object flags).
285 */
286 if (!args->no_dependents &&
287 ((o = lookup_object(the_repository, remote->hash)) != NULL) &&
288 (o->flags & COMPLETE)) {
289 continue;
290 }
291
292 remote_hex = oid_to_hex(remote);
293 if (!fetching) {
294 struct strbuf c = STRBUF_INIT;
295 if (multi_ack == 2) strbuf_addstr(&c, " multi_ack_detailed");
296 if (multi_ack == 1) strbuf_addstr(&c, " multi_ack");
297 if (no_done) strbuf_addstr(&c, " no-done");
298 if (use_sideband == 2) strbuf_addstr(&c, " side-band-64k");
299 if (use_sideband == 1) strbuf_addstr(&c, " side-band");
300 if (args->deepen_relative) strbuf_addstr(&c, " deepen-relative");
301 if (args->use_thin_pack) strbuf_addstr(&c, " thin-pack");
302 if (args->no_progress) strbuf_addstr(&c, " no-progress");
303 if (args->include_tag) strbuf_addstr(&c, " include-tag");
304 if (prefer_ofs_delta) strbuf_addstr(&c, " ofs-delta");
305 if (deepen_since_ok) strbuf_addstr(&c, " deepen-since");
306 if (deepen_not_ok) strbuf_addstr(&c, " deepen-not");
307 if (agent_supported) strbuf_addf(&c, " agent=%s",
308 git_user_agent_sanitized());
309 if (args->filter_options.choice)
310 strbuf_addstr(&c, " filter");
311 packet_buf_write(&req_buf, "want %s%s\n", remote_hex, c.buf);
312 strbuf_release(&c);
313 } else
314 packet_buf_write(&req_buf, "want %s\n", remote_hex);
315 fetching++;
316 }
317
318 if (!fetching) {
319 strbuf_release(&req_buf);
320 packet_flush(fd[1]);
321 return 1;
322 }
323
324 if (is_repository_shallow(the_repository))
325 write_shallow_commits(&req_buf, 1, NULL);
326 if (args->depth > 0)
327 packet_buf_write(&req_buf, "deepen %d", args->depth);
328 if (args->deepen_since) {
329 timestamp_t max_age = approxidate(args->deepen_since);
330 packet_buf_write(&req_buf, "deepen-since %"PRItime, max_age);
331 }
332 if (args->deepen_not) {
333 int i;
334 for (i = 0; i < args->deepen_not->nr; i++) {
335 struct string_list_item *s = args->deepen_not->items + i;
336 packet_buf_write(&req_buf, "deepen-not %s", s->string);
337 }
338 }
339 if (server_supports_filtering && args->filter_options.choice)
340 packet_buf_write(&req_buf, "filter %s",
341 args->filter_options.filter_spec);
342 packet_buf_flush(&req_buf);
343 state_len = req_buf.len;
344
345 if (args->deepen) {
346 const char *arg;
347 struct object_id oid;
348
349 send_request(args, fd[1], &req_buf);
350 while (packet_reader_read(&reader) == PACKET_READ_NORMAL) {
351 if (skip_prefix(reader.line, "shallow ", &arg)) {
352 if (get_oid_hex(arg, &oid))
353 die(_("invalid shallow line: %s"), reader.line);
354 register_shallow(the_repository, &oid);
355 continue;
356 }
357 if (skip_prefix(reader.line, "unshallow ", &arg)) {
358 if (get_oid_hex(arg, &oid))
359 die(_("invalid unshallow line: %s"), reader.line);
360 if (!lookup_object(the_repository, oid.hash))
361 die(_("object not found: %s"), reader.line);
362 /* make sure that it is parsed as shallow */
363 if (!parse_object(the_repository, &oid))
364 die(_("error in object: %s"), reader.line);
365 if (unregister_shallow(&oid))
366 die(_("no shallow found: %s"), reader.line);
367 continue;
368 }
369 die(_("expected shallow/unshallow, got %s"), reader.line);
370 }
371 } else if (!args->stateless_rpc)
372 send_request(args, fd[1], &req_buf);
373
374 if (!args->stateless_rpc) {
375 /* If we aren't using the stateless-rpc interface
376 * we don't need to retain the headers.
377 */
378 strbuf_setlen(&req_buf, 0);
379 state_len = 0;
380 }
381
382 flushes = 0;
383 retval = -1;
384 if (args->no_dependents)
385 goto done;
386 while ((oid = negotiator->next(negotiator))) {
387 packet_buf_write(&req_buf, "have %s\n", oid_to_hex(oid));
388 print_verbose(args, "have %s", oid_to_hex(oid));
389 in_vain++;
390 if (flush_at <= ++count) {
391 int ack;
392
393 packet_buf_flush(&req_buf);
394 send_request(args, fd[1], &req_buf);
395 strbuf_setlen(&req_buf, state_len);
396 flushes++;
397 flush_at = next_flush(args->stateless_rpc, count);
398
399 /*
400 * We keep one window "ahead" of the other side, and
401 * will wait for an ACK only on the next one
402 */
403 if (!args->stateless_rpc && count == INITIAL_FLUSH)
404 continue;
405
406 consume_shallow_list(args, &reader);
407 do {
408 ack = get_ack(&reader, result_oid);
409 if (ack)
410 print_verbose(args, _("got %s %d %s"), "ack",
411 ack, oid_to_hex(result_oid));
412 switch (ack) {
413 case ACK:
414 flushes = 0;
415 multi_ack = 0;
416 retval = 0;
417 goto done;
418 case ACK_common:
419 case ACK_ready:
420 case ACK_continue: {
421 struct commit *commit =
422 lookup_commit(the_repository,
423 result_oid);
424 int was_common;
425
426 if (!commit)
427 die(_("invalid commit %s"), oid_to_hex(result_oid));
428 was_common = negotiator->ack(negotiator, commit);
429 if (args->stateless_rpc
430 && ack == ACK_common
431 && !was_common) {
432 /* We need to replay the have for this object
433 * on the next RPC request so the peer knows
434 * it is in common with us.
435 */
436 const char *hex = oid_to_hex(result_oid);
437 packet_buf_write(&req_buf, "have %s\n", hex);
438 state_len = req_buf.len;
439 /*
440 * Reset in_vain because an ack
441 * for this commit has not been
442 * seen.
443 */
444 in_vain = 0;
445 } else if (!args->stateless_rpc
446 || ack != ACK_common)
447 in_vain = 0;
448 retval = 0;
449 got_continue = 1;
450 if (ack == ACK_ready)
451 got_ready = 1;
452 break;
453 }
454 }
455 } while (ack);
456 flushes--;
457 if (got_continue && MAX_IN_VAIN < in_vain) {
458 print_verbose(args, _("giving up"));
459 break; /* give up */
460 }
461 if (got_ready)
462 break;
463 }
464 }
465 done:
466 if (!got_ready || !no_done) {
467 packet_buf_write(&req_buf, "done\n");
468 send_request(args, fd[1], &req_buf);
469 }
470 print_verbose(args, _("done"));
471 if (retval != 0) {
472 multi_ack = 0;
473 flushes++;
474 }
475 strbuf_release(&req_buf);
476
477 if (!got_ready || !no_done)
478 consume_shallow_list(args, &reader);
479 while (flushes || multi_ack) {
480 int ack = get_ack(&reader, result_oid);
481 if (ack) {
482 print_verbose(args, _("got %s (%d) %s"), "ack",
483 ack, oid_to_hex(result_oid));
484 if (ack == ACK)
485 return 0;
486 multi_ack = 1;
487 continue;
488 }
489 flushes--;
490 }
491 /* it is no error to fetch into a completely empty repo */
492 return count ? retval : 0;
493 }
494
495 static struct commit_list *complete;
496
497 static int mark_complete(const struct object_id *oid)
498 {
499 struct object *o = parse_object(the_repository, oid);
500
501 while (o && o->type == OBJ_TAG) {
502 struct tag *t = (struct tag *) o;
503 if (!t->tagged)
504 break; /* broken repository */
505 o->flags |= COMPLETE;
506 o = parse_object(the_repository, &t->tagged->oid);
507 }
508 if (o && o->type == OBJ_COMMIT) {
509 struct commit *commit = (struct commit *)o;
510 if (!(commit->object.flags & COMPLETE)) {
511 commit->object.flags |= COMPLETE;
512 commit_list_insert(commit, &complete);
513 }
514 }
515 return 0;
516 }
517
518 static int mark_complete_oid(const char *refname, const struct object_id *oid,
519 int flag, void *cb_data)
520 {
521 return mark_complete(oid);
522 }
523
524 static void mark_recent_complete_commits(struct fetch_pack_args *args,
525 timestamp_t cutoff)
526 {
527 while (complete && cutoff <= complete->item->date) {
528 print_verbose(args, _("Marking %s as complete"),
529 oid_to_hex(&complete->item->object.oid));
530 pop_most_recent_commit(&complete, COMPLETE);
531 }
532 }
533
534 static void add_refs_to_oidset(struct oidset *oids, struct ref *refs)
535 {
536 for (; refs; refs = refs->next)
537 oidset_insert(oids, &refs->old_oid);
538 }
539
540 static int is_unmatched_ref(const struct ref *ref)
541 {
542 struct object_id oid;
543 const char *p;
544 return ref->match_status == REF_NOT_MATCHED &&
545 !parse_oid_hex(ref->name, &oid, &p) &&
546 *p == '\0' &&
547 oideq(&oid, &ref->old_oid);
548 }
549
550 static void filter_refs(struct fetch_pack_args *args,
551 struct ref **refs,
552 struct ref **sought, int nr_sought)
553 {
554 struct ref *newlist = NULL;
555 struct ref **newtail = &newlist;
556 struct ref *unmatched = NULL;
557 struct ref *ref, *next;
558 struct oidset tip_oids = OIDSET_INIT;
559 int i;
560 int strict = !(allow_unadvertised_object_request &
561 (ALLOW_TIP_SHA1 | ALLOW_REACHABLE_SHA1));
562
563 i = 0;
564 for (ref = *refs; ref; ref = next) {
565 int keep = 0;
566 next = ref->next;
567
568 if (starts_with(ref->name, "refs/") &&
569 check_refname_format(ref->name, 0))
570 ; /* trash */
571 else {
572 while (i < nr_sought) {
573 int cmp = strcmp(ref->name, sought[i]->name);
574 if (cmp < 0)
575 break; /* definitely do not have it */
576 else if (cmp == 0) {
577 keep = 1; /* definitely have it */
578 sought[i]->match_status = REF_MATCHED;
579 }
580 i++;
581 }
582
583 if (!keep && args->fetch_all &&
584 (!args->deepen || !starts_with(ref->name, "refs/tags/")))
585 keep = 1;
586 }
587
588 if (keep) {
589 *newtail = ref;
590 ref->next = NULL;
591 newtail = &ref->next;
592 } else {
593 ref->next = unmatched;
594 unmatched = ref;
595 }
596 }
597
598 if (strict) {
599 for (i = 0; i < nr_sought; i++) {
600 ref = sought[i];
601 if (!is_unmatched_ref(ref))
602 continue;
603
604 add_refs_to_oidset(&tip_oids, unmatched);
605 add_refs_to_oidset(&tip_oids, newlist);
606 break;
607 }
608 }
609
610 /* Append unmatched requests to the list */
611 for (i = 0; i < nr_sought; i++) {
612 ref = sought[i];
613 if (!is_unmatched_ref(ref))
614 continue;
615
616 if (!strict || oidset_contains(&tip_oids, &ref->old_oid)) {
617 ref->match_status = REF_MATCHED;
618 *newtail = copy_ref(ref);
619 newtail = &(*newtail)->next;
620 } else {
621 ref->match_status = REF_UNADVERTISED_NOT_ALLOWED;
622 }
623 }
624
625 oidset_clear(&tip_oids);
626 for (ref = unmatched; ref; ref = next) {
627 next = ref->next;
628 free(ref);
629 }
630
631 *refs = newlist;
632 }
633
634 static void mark_alternate_complete(struct fetch_negotiator *unused,
635 struct object *obj)
636 {
637 mark_complete(&obj->oid);
638 }
639
640 struct loose_object_iter {
641 struct oidset *loose_object_set;
642 struct ref *refs;
643 };
644
645 /*
646 * Mark recent commits available locally and reachable from a local ref as
647 * COMPLETE. If args->no_dependents is false, also mark COMPLETE remote refs as
648 * COMMON_REF (otherwise, we are not planning to participate in negotiation, and
649 * thus do not need COMMON_REF marks).
650 *
651 * The cutoff time for recency is determined by this heuristic: it is the
652 * earliest commit time of the objects in refs that are commits and that we know
653 * the commit time of.
654 */
655 static void mark_complete_and_common_ref(struct fetch_negotiator *negotiator,
656 struct fetch_pack_args *args,
657 struct ref **refs)
658 {
659 struct ref *ref;
660 int old_save_commit_buffer = save_commit_buffer;
661 timestamp_t cutoff = 0;
662
663 save_commit_buffer = 0;
664
665 for (ref = *refs; ref; ref = ref->next) {
666 struct object *o;
667
668 if (!has_object_file_with_flags(&ref->old_oid,
669 OBJECT_INFO_QUICK))
670 continue;
671 o = parse_object(the_repository, &ref->old_oid);
672 if (!o)
673 continue;
674
675 /* We already have it -- which may mean that we were
676 * in sync with the other side at some time after
677 * that (it is OK if we guess wrong here).
678 */
679 if (o->type == OBJ_COMMIT) {
680 struct commit *commit = (struct commit *)o;
681 if (!cutoff || cutoff < commit->date)
682 cutoff = commit->date;
683 }
684 }
685
686 if (!args->deepen) {
687 for_each_ref(mark_complete_oid, NULL);
688 for_each_cached_alternate(NULL, mark_alternate_complete);
689 commit_list_sort_by_date(&complete);
690 if (cutoff)
691 mark_recent_complete_commits(args, cutoff);
692 }
693
694 /*
695 * Mark all complete remote refs as common refs.
696 * Don't mark them common yet; the server has to be told so first.
697 */
698 for (ref = *refs; ref; ref = ref->next) {
699 struct object *o = deref_tag(the_repository,
700 lookup_object(the_repository,
701 ref->old_oid.hash),
702 NULL, 0);
703
704 if (!o || o->type != OBJ_COMMIT || !(o->flags & COMPLETE))
705 continue;
706
707 negotiator->known_common(negotiator,
708 (struct commit *)o);
709 }
710
711 save_commit_buffer = old_save_commit_buffer;
712 }
713
714 /*
715 * Returns 1 if every object pointed to by the given remote refs is available
716 * locally and reachable from a local ref, and 0 otherwise.
717 */
718 static int everything_local(struct fetch_pack_args *args,
719 struct ref **refs)
720 {
721 struct ref *ref;
722 int retval;
723
724 for (retval = 1, ref = *refs; ref ; ref = ref->next) {
725 const struct object_id *remote = &ref->old_oid;
726 struct object *o;
727
728 o = lookup_object(the_repository, remote->hash);
729 if (!o || !(o->flags & COMPLETE)) {
730 retval = 0;
731 print_verbose(args, "want %s (%s)", oid_to_hex(remote),
732 ref->name);
733 continue;
734 }
735 print_verbose(args, _("already have %s (%s)"), oid_to_hex(remote),
736 ref->name);
737 }
738
739 return retval;
740 }
741
742 static int sideband_demux(int in, int out, void *data)
743 {
744 int *xd = data;
745 int ret;
746
747 ret = recv_sideband("fetch-pack", xd[0], out);
748 close(out);
749 return ret;
750 }
751
752 static int get_pack(struct fetch_pack_args *args,
753 int xd[2], char **pack_lockfile)
754 {
755 struct async demux;
756 int do_keep = args->keep_pack;
757 const char *cmd_name;
758 struct pack_header header;
759 int pass_header = 0;
760 struct child_process cmd = CHILD_PROCESS_INIT;
761 int ret;
762
763 memset(&demux, 0, sizeof(demux));
764 if (use_sideband) {
765 /* xd[] is talking with upload-pack; subprocess reads from
766 * xd[0], spits out band#2 to stderr, and feeds us band#1
767 * through demux->out.
768 */
769 demux.proc = sideband_demux;
770 demux.data = xd;
771 demux.out = -1;
772 demux.isolate_sigpipe = 1;
773 if (start_async(&demux))
774 die(_("fetch-pack: unable to fork off sideband demultiplexer"));
775 }
776 else
777 demux.out = xd[0];
778
779 if (!args->keep_pack && unpack_limit) {
780
781 if (read_pack_header(demux.out, &header))
782 die(_("protocol error: bad pack header"));
783 pass_header = 1;
784 if (ntohl(header.hdr_entries) < unpack_limit)
785 do_keep = 0;
786 else
787 do_keep = 1;
788 }
789
790 if (alternate_shallow_file) {
791 argv_array_push(&cmd.args, "--shallow-file");
792 argv_array_push(&cmd.args, alternate_shallow_file);
793 }
794
795 if (do_keep || args->from_promisor) {
796 if (pack_lockfile)
797 cmd.out = -1;
798 cmd_name = "index-pack";
799 argv_array_push(&cmd.args, cmd_name);
800 argv_array_push(&cmd.args, "--stdin");
801 if (!args->quiet && !args->no_progress)
802 argv_array_push(&cmd.args, "-v");
803 if (args->use_thin_pack)
804 argv_array_push(&cmd.args, "--fix-thin");
805 if (do_keep && (args->lock_pack || unpack_limit)) {
806 char hostname[HOST_NAME_MAX + 1];
807 if (xgethostname(hostname, sizeof(hostname)))
808 xsnprintf(hostname, sizeof(hostname), "localhost");
809 argv_array_pushf(&cmd.args,
810 "--keep=fetch-pack %"PRIuMAX " on %s",
811 (uintmax_t)getpid(), hostname);
812 }
813 if (args->check_self_contained_and_connected)
814 argv_array_push(&cmd.args, "--check-self-contained-and-connected");
815 if (args->from_promisor)
816 argv_array_push(&cmd.args, "--promisor");
817 }
818 else {
819 cmd_name = "unpack-objects";
820 argv_array_push(&cmd.args, cmd_name);
821 if (args->quiet || args->no_progress)
822 argv_array_push(&cmd.args, "-q");
823 args->check_self_contained_and_connected = 0;
824 }
825
826 if (pass_header)
827 argv_array_pushf(&cmd.args, "--pack_header=%"PRIu32",%"PRIu32,
828 ntohl(header.hdr_version),
829 ntohl(header.hdr_entries));
830 if (fetch_fsck_objects >= 0
831 ? fetch_fsck_objects
832 : transfer_fsck_objects >= 0
833 ? transfer_fsck_objects
834 : 0) {
835 if (args->from_promisor)
836 /*
837 * We cannot use --strict in index-pack because it
838 * checks both broken objects and links, but we only
839 * want to check for broken objects.
840 */
841 argv_array_push(&cmd.args, "--fsck-objects");
842 else
843 argv_array_pushf(&cmd.args, "--strict%s",
844 fsck_msg_types.buf);
845 }
846
847 cmd.in = demux.out;
848 cmd.git_cmd = 1;
849 if (start_command(&cmd))
850 die(_("fetch-pack: unable to fork off %s"), cmd_name);
851 if (do_keep && pack_lockfile) {
852 *pack_lockfile = index_pack_lockfile(cmd.out);
853 close(cmd.out);
854 }
855
856 if (!use_sideband)
857 /* Closed by start_command() */
858 xd[0] = -1;
859
860 ret = finish_command(&cmd);
861 if (!ret || (args->check_self_contained_and_connected && ret == 1))
862 args->self_contained_and_connected =
863 args->check_self_contained_and_connected &&
864 ret == 0;
865 else
866 die(_("%s failed"), cmd_name);
867 if (use_sideband && finish_async(&demux))
868 die(_("error in sideband demultiplexer"));
869 return 0;
870 }
871
872 static int cmp_ref_by_name(const void *a_, const void *b_)
873 {
874 const struct ref *a = *((const struct ref **)a_);
875 const struct ref *b = *((const struct ref **)b_);
876 return strcmp(a->name, b->name);
877 }
878
879 static struct ref *do_fetch_pack(struct fetch_pack_args *args,
880 int fd[2],
881 const struct ref *orig_ref,
882 struct ref **sought, int nr_sought,
883 struct shallow_info *si,
884 char **pack_lockfile)
885 {
886 struct ref *ref = copy_ref_list(orig_ref);
887 struct object_id oid;
888 const char *agent_feature;
889 int agent_len;
890 struct fetch_negotiator negotiator;
891 fetch_negotiator_init(&negotiator, negotiation_algorithm);
892
893 sort_ref_list(&ref, ref_compare_name);
894 QSORT(sought, nr_sought, cmp_ref_by_name);
895
896 if ((args->depth > 0 || is_repository_shallow(the_repository)) && !server_supports("shallow"))
897 die(_("Server does not support shallow clients"));
898 if (args->depth > 0 || args->deepen_since || args->deepen_not)
899 args->deepen = 1;
900 if (server_supports("multi_ack_detailed")) {
901 print_verbose(args, _("Server supports multi_ack_detailed"));
902 multi_ack = 2;
903 if (server_supports("no-done")) {
904 print_verbose(args, _("Server supports no-done"));
905 if (args->stateless_rpc)
906 no_done = 1;
907 }
908 }
909 else if (server_supports("multi_ack")) {
910 print_verbose(args, _("Server supports multi_ack"));
911 multi_ack = 1;
912 }
913 if (server_supports("side-band-64k")) {
914 print_verbose(args, _("Server supports side-band-64k"));
915 use_sideband = 2;
916 }
917 else if (server_supports("side-band")) {
918 print_verbose(args, _("Server supports side-band"));
919 use_sideband = 1;
920 }
921 if (server_supports("allow-tip-sha1-in-want")) {
922 print_verbose(args, _("Server supports allow-tip-sha1-in-want"));
923 allow_unadvertised_object_request |= ALLOW_TIP_SHA1;
924 }
925 if (server_supports("allow-reachable-sha1-in-want")) {
926 print_verbose(args, _("Server supports allow-reachable-sha1-in-want"));
927 allow_unadvertised_object_request |= ALLOW_REACHABLE_SHA1;
928 }
929 if (!server_supports("thin-pack"))
930 args->use_thin_pack = 0;
931 if (!server_supports("no-progress"))
932 args->no_progress = 0;
933 if (!server_supports("include-tag"))
934 args->include_tag = 0;
935 if (server_supports("ofs-delta"))
936 print_verbose(args, _("Server supports ofs-delta"));
937 else
938 prefer_ofs_delta = 0;
939
940 if (server_supports("filter")) {
941 server_supports_filtering = 1;
942 print_verbose(args, _("Server supports filter"));
943 } else if (args->filter_options.choice) {
944 warning("filtering not recognized by server, ignoring");
945 }
946
947 if ((agent_feature = server_feature_value("agent", &agent_len))) {
948 agent_supported = 1;
949 if (agent_len)
950 print_verbose(args, _("Server version is %.*s"),
951 agent_len, agent_feature);
952 }
953 if (server_supports("deepen-since"))
954 deepen_since_ok = 1;
955 else if (args->deepen_since)
956 die(_("Server does not support --shallow-since"));
957 if (server_supports("deepen-not"))
958 deepen_not_ok = 1;
959 else if (args->deepen_not)
960 die(_("Server does not support --shallow-exclude"));
961 if (!server_supports("deepen-relative") && args->deepen_relative)
962 die(_("Server does not support --deepen"));
963
964 if (!args->no_dependents) {
965 mark_complete_and_common_ref(&negotiator, args, &ref);
966 filter_refs(args, &ref, sought, nr_sought);
967 if (everything_local(args, &ref)) {
968 packet_flush(fd[1]);
969 goto all_done;
970 }
971 } else {
972 filter_refs(args, &ref, sought, nr_sought);
973 }
974 if (find_common(&negotiator, args, fd, &oid, ref) < 0)
975 if (!args->keep_pack)
976 /* When cloning, it is not unusual to have
977 * no common commit.
978 */
979 warning(_("no common commits"));
980
981 if (args->stateless_rpc)
982 packet_flush(fd[1]);
983 if (args->deepen)
984 setup_alternate_shallow(&shallow_lock, &alternate_shallow_file,
985 NULL);
986 else if (si->nr_ours || si->nr_theirs)
987 alternate_shallow_file = setup_temporary_shallow(si->shallow);
988 else
989 alternate_shallow_file = NULL;
990 if (get_pack(args, fd, pack_lockfile))
991 die(_("git fetch-pack: fetch failed."));
992
993 all_done:
994 negotiator.release(&negotiator);
995 return ref;
996 }
997
998 static void add_shallow_requests(struct strbuf *req_buf,
999 const struct fetch_pack_args *args)
1000 {
1001 if (is_repository_shallow(the_repository))
1002 write_shallow_commits(req_buf, 1, NULL);
1003 if (args->depth > 0)
1004 packet_buf_write(req_buf, "deepen %d", args->depth);
1005 if (args->deepen_since) {
1006 timestamp_t max_age = approxidate(args->deepen_since);
1007 packet_buf_write(req_buf, "deepen-since %"PRItime, max_age);
1008 }
1009 if (args->deepen_not) {
1010 int i;
1011 for (i = 0; i < args->deepen_not->nr; i++) {
1012 struct string_list_item *s = args->deepen_not->items + i;
1013 packet_buf_write(req_buf, "deepen-not %s", s->string);
1014 }
1015 }
1016 }
1017
1018 static void add_wants(int no_dependents, const struct ref *wants, struct strbuf *req_buf)
1019 {
1020 int use_ref_in_want = server_supports_feature("fetch", "ref-in-want", 0);
1021
1022 for ( ; wants ; wants = wants->next) {
1023 const struct object_id *remote = &wants->old_oid;
1024 struct object *o;
1025
1026 /*
1027 * If that object is complete (i.e. it is an ancestor of a
1028 * local ref), we tell them we have it but do not have to
1029 * tell them about its ancestors, which they already know
1030 * about.
1031 *
1032 * We use lookup_object here because we are only
1033 * interested in the case we *know* the object is
1034 * reachable and we have already scanned it.
1035 *
1036 * Do this only if args->no_dependents is false (if it is true,
1037 * we cannot trust the object flags).
1038 */
1039 if (!no_dependents &&
1040 ((o = lookup_object(the_repository, remote->hash)) != NULL) &&
1041 (o->flags & COMPLETE)) {
1042 continue;
1043 }
1044
1045 if (!use_ref_in_want || wants->exact_oid)
1046 packet_buf_write(req_buf, "want %s\n", oid_to_hex(remote));
1047 else
1048 packet_buf_write(req_buf, "want-ref %s\n", wants->name);
1049 }
1050 }
1051
1052 static void add_common(struct strbuf *req_buf, struct oidset *common)
1053 {
1054 struct oidset_iter iter;
1055 const struct object_id *oid;
1056 oidset_iter_init(common, &iter);
1057
1058 while ((oid = oidset_iter_next(&iter))) {
1059 packet_buf_write(req_buf, "have %s\n", oid_to_hex(oid));
1060 }
1061 }
1062
1063 static int add_haves(struct fetch_negotiator *negotiator,
1064 struct strbuf *req_buf,
1065 int *haves_to_send, int *in_vain)
1066 {
1067 int ret = 0;
1068 int haves_added = 0;
1069 const struct object_id *oid;
1070
1071 while ((oid = negotiator->next(negotiator))) {
1072 packet_buf_write(req_buf, "have %s\n", oid_to_hex(oid));
1073 if (++haves_added >= *haves_to_send)
1074 break;
1075 }
1076
1077 *in_vain += haves_added;
1078 if (!haves_added || *in_vain >= MAX_IN_VAIN) {
1079 /* Send Done */
1080 packet_buf_write(req_buf, "done\n");
1081 ret = 1;
1082 }
1083
1084 /* Increase haves to send on next round */
1085 *haves_to_send = next_flush(1, *haves_to_send);
1086
1087 return ret;
1088 }
1089
1090 static int send_fetch_request(struct fetch_negotiator *negotiator, int fd_out,
1091 const struct fetch_pack_args *args,
1092 const struct ref *wants, struct oidset *common,
1093 int *haves_to_send, int *in_vain)
1094 {
1095 int ret = 0;
1096 struct strbuf req_buf = STRBUF_INIT;
1097
1098 if (server_supports_v2("fetch", 1))
1099 packet_buf_write(&req_buf, "command=fetch");
1100 if (server_supports_v2("agent", 0))
1101 packet_buf_write(&req_buf, "agent=%s", git_user_agent_sanitized());
1102 if (args->server_options && args->server_options->nr &&
1103 server_supports_v2("server-option", 1)) {
1104 int i;
1105 for (i = 0; i < args->server_options->nr; i++)
1106 packet_write_fmt(fd_out, "server-option=%s",
1107 args->server_options->items[i].string);
1108 }
1109
1110 packet_buf_delim(&req_buf);
1111 if (args->use_thin_pack)
1112 packet_buf_write(&req_buf, "thin-pack");
1113 if (args->no_progress)
1114 packet_buf_write(&req_buf, "no-progress");
1115 if (args->include_tag)
1116 packet_buf_write(&req_buf, "include-tag");
1117 if (prefer_ofs_delta)
1118 packet_buf_write(&req_buf, "ofs-delta");
1119
1120 /* Add shallow-info and deepen request */
1121 if (server_supports_feature("fetch", "shallow", 0))
1122 add_shallow_requests(&req_buf, args);
1123 else if (is_repository_shallow(the_repository) || args->deepen)
1124 die(_("Server does not support shallow requests"));
1125
1126 /* Add filter */
1127 if (server_supports_feature("fetch", "filter", 0) &&
1128 args->filter_options.choice) {
1129 print_verbose(args, _("Server supports filter"));
1130 packet_buf_write(&req_buf, "filter %s",
1131 args->filter_options.filter_spec);
1132 } else if (args->filter_options.choice) {
1133 warning("filtering not recognized by server, ignoring");
1134 }
1135
1136 /* add wants */
1137 add_wants(args->no_dependents, wants, &req_buf);
1138
1139 if (args->no_dependents) {
1140 packet_buf_write(&req_buf, "done");
1141 ret = 1;
1142 } else {
1143 /* Add all of the common commits we've found in previous rounds */
1144 add_common(&req_buf, common);
1145
1146 /* Add initial haves */
1147 ret = add_haves(negotiator, &req_buf, haves_to_send, in_vain);
1148 }
1149
1150 /* Send request */
1151 packet_buf_flush(&req_buf);
1152 write_or_die(fd_out, req_buf.buf, req_buf.len);
1153
1154 strbuf_release(&req_buf);
1155 return ret;
1156 }
1157
1158 /*
1159 * Processes a section header in a server's response and checks if it matches
1160 * `section`. If the value of `peek` is 1, the header line will be peeked (and
1161 * not consumed); if 0, the line will be consumed and the function will die if
1162 * the section header doesn't match what was expected.
1163 */
1164 static int process_section_header(struct packet_reader *reader,
1165 const char *section, int peek)
1166 {
1167 int ret;
1168
1169 if (packet_reader_peek(reader) != PACKET_READ_NORMAL)
1170 die(_("error reading section header '%s'"), section);
1171
1172 ret = !strcmp(reader->line, section);
1173
1174 if (!peek) {
1175 if (!ret)
1176 die(_("expected '%s', received '%s'"),
1177 section, reader->line);
1178 packet_reader_read(reader);
1179 }
1180
1181 return ret;
1182 }
1183
1184 static int process_acks(struct fetch_negotiator *negotiator,
1185 struct packet_reader *reader,
1186 struct oidset *common)
1187 {
1188 /* received */
1189 int received_ready = 0;
1190 int received_ack = 0;
1191
1192 process_section_header(reader, "acknowledgments", 0);
1193 while (packet_reader_read(reader) == PACKET_READ_NORMAL) {
1194 const char *arg;
1195
1196 if (!strcmp(reader->line, "NAK"))
1197 continue;
1198
1199 if (skip_prefix(reader->line, "ACK ", &arg)) {
1200 struct object_id oid;
1201 if (!get_oid_hex(arg, &oid)) {
1202 struct commit *commit;
1203 oidset_insert(common, &oid);
1204 commit = lookup_commit(the_repository, &oid);
1205 negotiator->ack(negotiator, commit);
1206 }
1207 continue;
1208 }
1209
1210 if (!strcmp(reader->line, "ready")) {
1211 received_ready = 1;
1212 continue;
1213 }
1214
1215 die(_("unexpected acknowledgment line: '%s'"), reader->line);
1216 }
1217
1218 if (reader->status != PACKET_READ_FLUSH &&
1219 reader->status != PACKET_READ_DELIM)
1220 die(_("error processing acks: %d"), reader->status);
1221
1222 /*
1223 * If an "acknowledgments" section is sent, a packfile is sent if and
1224 * only if "ready" was sent in this section. The other sections
1225 * ("shallow-info" and "wanted-refs") are sent only if a packfile is
1226 * sent. Therefore, a DELIM is expected if "ready" is sent, and a FLUSH
1227 * otherwise.
1228 */
1229 if (received_ready && reader->status != PACKET_READ_DELIM)
1230 die(_("expected packfile to be sent after 'ready'"));
1231 if (!received_ready && reader->status != PACKET_READ_FLUSH)
1232 die(_("expected no other sections to be sent after no 'ready'"));
1233
1234 /* return 0 if no common, 1 if there are common, or 2 if ready */
1235 return received_ready ? 2 : (received_ack ? 1 : 0);
1236 }
1237
1238 static void receive_shallow_info(struct fetch_pack_args *args,
1239 struct packet_reader *reader)
1240 {
1241 process_section_header(reader, "shallow-info", 0);
1242 while (packet_reader_read(reader) == PACKET_READ_NORMAL) {
1243 const char *arg;
1244 struct object_id oid;
1245
1246 if (skip_prefix(reader->line, "shallow ", &arg)) {
1247 if (get_oid_hex(arg, &oid))
1248 die(_("invalid shallow line: %s"), reader->line);
1249 register_shallow(the_repository, &oid);
1250 continue;
1251 }
1252 if (skip_prefix(reader->line, "unshallow ", &arg)) {
1253 if (get_oid_hex(arg, &oid))
1254 die(_("invalid unshallow line: %s"), reader->line);
1255 if (!lookup_object(the_repository, oid.hash))
1256 die(_("object not found: %s"), reader->line);
1257 /* make sure that it is parsed as shallow */
1258 if (!parse_object(the_repository, &oid))
1259 die(_("error in object: %s"), reader->line);
1260 if (unregister_shallow(&oid))
1261 die(_("no shallow found: %s"), reader->line);
1262 continue;
1263 }
1264 die(_("expected shallow/unshallow, got %s"), reader->line);
1265 }
1266
1267 if (reader->status != PACKET_READ_FLUSH &&
1268 reader->status != PACKET_READ_DELIM)
1269 die(_("error processing shallow info: %d"), reader->status);
1270
1271 setup_alternate_shallow(&shallow_lock, &alternate_shallow_file, NULL);
1272 args->deepen = 1;
1273 }
1274
1275 static void receive_wanted_refs(struct packet_reader *reader,
1276 struct ref **sought, int nr_sought)
1277 {
1278 process_section_header(reader, "wanted-refs", 0);
1279 while (packet_reader_read(reader) == PACKET_READ_NORMAL) {
1280 struct object_id oid;
1281 const char *end;
1282 int i;
1283
1284 if (parse_oid_hex(reader->line, &oid, &end) || *end++ != ' ')
1285 die(_("expected wanted-ref, got '%s'"), reader->line);
1286
1287 for (i = 0; i < nr_sought; i++) {
1288 if (!strcmp(end, sought[i]->name)) {
1289 oidcpy(&sought[i]->old_oid, &oid);
1290 break;
1291 }
1292 }
1293
1294 if (i == nr_sought)
1295 die(_("unexpected wanted-ref: '%s'"), reader->line);
1296 }
1297
1298 if (reader->status != PACKET_READ_DELIM)
1299 die(_("error processing wanted refs: %d"), reader->status);
1300 }
1301
1302 enum fetch_state {
1303 FETCH_CHECK_LOCAL = 0,
1304 FETCH_SEND_REQUEST,
1305 FETCH_PROCESS_ACKS,
1306 FETCH_GET_PACK,
1307 FETCH_DONE,
1308 };
1309
1310 static struct ref *do_fetch_pack_v2(struct fetch_pack_args *args,
1311 int fd[2],
1312 const struct ref *orig_ref,
1313 struct ref **sought, int nr_sought,
1314 char **pack_lockfile)
1315 {
1316 struct ref *ref = copy_ref_list(orig_ref);
1317 enum fetch_state state = FETCH_CHECK_LOCAL;
1318 struct oidset common = OIDSET_INIT;
1319 struct packet_reader reader;
1320 int in_vain = 0;
1321 int haves_to_send = INITIAL_FLUSH;
1322 struct fetch_negotiator negotiator;
1323 fetch_negotiator_init(&negotiator, negotiation_algorithm);
1324 packet_reader_init(&reader, fd[0], NULL, 0,
1325 PACKET_READ_CHOMP_NEWLINE |
1326 PACKET_READ_DIE_ON_ERR_PACKET);
1327
1328 while (state != FETCH_DONE) {
1329 switch (state) {
1330 case FETCH_CHECK_LOCAL:
1331 sort_ref_list(&ref, ref_compare_name);
1332 QSORT(sought, nr_sought, cmp_ref_by_name);
1333
1334 /* v2 supports these by default */
1335 allow_unadvertised_object_request |= ALLOW_REACHABLE_SHA1;
1336 use_sideband = 2;
1337 if (args->depth > 0 || args->deepen_since || args->deepen_not)
1338 args->deepen = 1;
1339
1340 /* Filter 'ref' by 'sought' and those that aren't local */
1341 if (!args->no_dependents) {
1342 mark_complete_and_common_ref(&negotiator, args, &ref);
1343 filter_refs(args, &ref, sought, nr_sought);
1344 if (everything_local(args, &ref))
1345 state = FETCH_DONE;
1346 else
1347 state = FETCH_SEND_REQUEST;
1348
1349 mark_tips(&negotiator, args->negotiation_tips);
1350 for_each_cached_alternate(&negotiator,
1351 insert_one_alternate_object);
1352 } else {
1353 filter_refs(args, &ref, sought, nr_sought);
1354 state = FETCH_SEND_REQUEST;
1355 }
1356 break;
1357 case FETCH_SEND_REQUEST:
1358 if (send_fetch_request(&negotiator, fd[1], args, ref,
1359 &common,
1360 &haves_to_send, &in_vain))
1361 state = FETCH_GET_PACK;
1362 else
1363 state = FETCH_PROCESS_ACKS;
1364 break;
1365 case FETCH_PROCESS_ACKS:
1366 /* Process ACKs/NAKs */
1367 switch (process_acks(&negotiator, &reader, &common)) {
1368 case 2:
1369 state = FETCH_GET_PACK;
1370 break;
1371 case 1:
1372 in_vain = 0;
1373 /* fallthrough */
1374 default:
1375 state = FETCH_SEND_REQUEST;
1376 break;
1377 }
1378 break;
1379 case FETCH_GET_PACK:
1380 /* Check for shallow-info section */
1381 if (process_section_header(&reader, "shallow-info", 1))
1382 receive_shallow_info(args, &reader);
1383
1384 if (process_section_header(&reader, "wanted-refs", 1))
1385 receive_wanted_refs(&reader, sought, nr_sought);
1386
1387 /* get the pack */
1388 process_section_header(&reader, "packfile", 0);
1389 if (get_pack(args, fd, pack_lockfile))
1390 die(_("git fetch-pack: fetch failed."));
1391
1392 state = FETCH_DONE;
1393 break;
1394 case FETCH_DONE:
1395 continue;
1396 }
1397 }
1398
1399 negotiator.release(&negotiator);
1400 oidset_clear(&common);
1401 return ref;
1402 }
1403
1404 static int fetch_pack_config_cb(const char *var, const char *value, void *cb)
1405 {
1406 if (strcmp(var, "fetch.fsck.skiplist") == 0) {
1407 const char *path;
1408
1409 if (git_config_pathname(&path, var, value))
1410 return 1;
1411 strbuf_addf(&fsck_msg_types, "%cskiplist=%s",
1412 fsck_msg_types.len ? ',' : '=', path);
1413 free((char *)path);
1414 return 0;
1415 }
1416
1417 if (skip_prefix(var, "fetch.fsck.", &var)) {
1418 if (is_valid_msg_type(var, value))
1419 strbuf_addf(&fsck_msg_types, "%c%s=%s",
1420 fsck_msg_types.len ? ',' : '=', var, value);
1421 else
1422 warning("Skipping unknown msg id '%s'", var);
1423 return 0;
1424 }
1425
1426 return git_default_config(var, value, cb);
1427 }
1428
1429 static void fetch_pack_config(void)
1430 {
1431 git_config_get_int("fetch.unpacklimit", &fetch_unpack_limit);
1432 git_config_get_int("transfer.unpacklimit", &transfer_unpack_limit);
1433 git_config_get_bool("repack.usedeltabaseoffset", &prefer_ofs_delta);
1434 git_config_get_bool("fetch.fsckobjects", &fetch_fsck_objects);
1435 git_config_get_bool("transfer.fsckobjects", &transfer_fsck_objects);
1436 git_config_get_string("fetch.negotiationalgorithm",
1437 &negotiation_algorithm);
1438
1439 git_config(fetch_pack_config_cb, NULL);
1440 }
1441
1442 static void fetch_pack_setup(void)
1443 {
1444 static int did_setup;
1445 if (did_setup)
1446 return;
1447 fetch_pack_config();
1448 if (0 <= transfer_unpack_limit)
1449 unpack_limit = transfer_unpack_limit;
1450 else if (0 <= fetch_unpack_limit)
1451 unpack_limit = fetch_unpack_limit;
1452 did_setup = 1;
1453 }
1454
1455 static int remove_duplicates_in_refs(struct ref **ref, int nr)
1456 {
1457 struct string_list names = STRING_LIST_INIT_NODUP;
1458 int src, dst;
1459
1460 for (src = dst = 0; src < nr; src++) {
1461 struct string_list_item *item;
1462 item = string_list_insert(&names, ref[src]->name);
1463 if (item->util)
1464 continue; /* already have it */
1465 item->util = ref[src];
1466 if (src != dst)
1467 ref[dst] = ref[src];
1468 dst++;
1469 }
1470 for (src = dst; src < nr; src++)
1471 ref[src] = NULL;
1472 string_list_clear(&names, 0);
1473 return dst;
1474 }
1475
1476 static void update_shallow(struct fetch_pack_args *args,
1477 struct ref **sought, int nr_sought,
1478 struct shallow_info *si)
1479 {
1480 struct oid_array ref = OID_ARRAY_INIT;
1481 int *status;
1482 int i;
1483
1484 if (args->deepen && alternate_shallow_file) {
1485 if (*alternate_shallow_file == '\0') { /* --unshallow */
1486 unlink_or_warn(git_path_shallow(the_repository));
1487 rollback_lock_file(&shallow_lock);
1488 } else
1489 commit_lock_file(&shallow_lock);
1490 return;
1491 }
1492
1493 if (!si->shallow || !si->shallow->nr)
1494 return;
1495
1496 if (args->cloning) {
1497 /*
1498 * remote is shallow, but this is a clone, there are
1499 * no objects in repo to worry about. Accept any
1500 * shallow points that exist in the pack (iow in repo
1501 * after get_pack() and reprepare_packed_git())
1502 */
1503 struct oid_array extra = OID_ARRAY_INIT;
1504 struct object_id *oid = si->shallow->oid;
1505 for (i = 0; i < si->shallow->nr; i++)
1506 if (has_object_file(&oid[i]))
1507 oid_array_append(&extra, &oid[i]);
1508 if (extra.nr) {
1509 setup_alternate_shallow(&shallow_lock,
1510 &alternate_shallow_file,
1511 &extra);
1512 commit_lock_file(&shallow_lock);
1513 }
1514 oid_array_clear(&extra);
1515 return;
1516 }
1517
1518 if (!si->nr_ours && !si->nr_theirs)
1519 return;
1520
1521 remove_nonexistent_theirs_shallow(si);
1522 if (!si->nr_ours && !si->nr_theirs)
1523 return;
1524 for (i = 0; i < nr_sought; i++)
1525 oid_array_append(&ref, &sought[i]->old_oid);
1526 si->ref = &ref;
1527
1528 if (args->update_shallow) {
1529 /*
1530 * remote is also shallow, .git/shallow may be updated
1531 * so all refs can be accepted. Make sure we only add
1532 * shallow roots that are actually reachable from new
1533 * refs.
1534 */
1535 struct oid_array extra = OID_ARRAY_INIT;
1536 struct object_id *oid = si->shallow->oid;
1537 assign_shallow_commits_to_refs(si, NULL, NULL);
1538 if (!si->nr_ours && !si->nr_theirs) {
1539 oid_array_clear(&ref);
1540 return;
1541 }
1542 for (i = 0; i < si->nr_ours; i++)
1543 oid_array_append(&extra, &oid[si->ours[i]]);
1544 for (i = 0; i < si->nr_theirs; i++)
1545 oid_array_append(&extra, &oid[si->theirs[i]]);
1546 setup_alternate_shallow(&shallow_lock,
1547 &alternate_shallow_file,
1548 &extra);
1549 commit_lock_file(&shallow_lock);
1550 oid_array_clear(&extra);
1551 oid_array_clear(&ref);
1552 return;
1553 }
1554
1555 /*
1556 * remote is also shallow, check what ref is safe to update
1557 * without updating .git/shallow
1558 */
1559 status = xcalloc(nr_sought, sizeof(*status));
1560 assign_shallow_commits_to_refs(si, NULL, status);
1561 if (si->nr_ours || si->nr_theirs) {
1562 for (i = 0; i < nr_sought; i++)
1563 if (status[i])
1564 sought[i]->status = REF_STATUS_REJECT_SHALLOW;
1565 }
1566 free(status);
1567 oid_array_clear(&ref);
1568 }
1569
1570 static int iterate_ref_map(void *cb_data, struct object_id *oid)
1571 {
1572 struct ref **rm = cb_data;
1573 struct ref *ref = *rm;
1574
1575 if (!ref)
1576 return -1; /* end of the list */
1577 *rm = ref->next;
1578 oidcpy(oid, &ref->old_oid);
1579 return 0;
1580 }
1581
1582 struct ref *fetch_pack(struct fetch_pack_args *args,
1583 int fd[], struct child_process *conn,
1584 const struct ref *ref,
1585 const char *dest,
1586 struct ref **sought, int nr_sought,
1587 struct oid_array *shallow,
1588 char **pack_lockfile,
1589 enum protocol_version version)
1590 {
1591 struct ref *ref_cpy;
1592 struct shallow_info si;
1593
1594 fetch_pack_setup();
1595 if (nr_sought)
1596 nr_sought = remove_duplicates_in_refs(sought, nr_sought);
1597
1598 if (args->no_dependents && !args->filter_options.choice) {
1599 /*
1600 * The protocol does not support requesting that only the
1601 * wanted objects be sent, so approximate this by setting a
1602 * "blob:none" filter if no filter is already set. This works
1603 * for all object types: note that wanted blobs will still be
1604 * sent because they are directly specified as a "want".
1605 *
1606 * NEEDSWORK: Add an option in the protocol to request that
1607 * only the wanted objects be sent, and implement it.
1608 */
1609 parse_list_objects_filter(&args->filter_options, "blob:none");
1610 }
1611
1612 if (version != protocol_v2 && !ref) {
1613 packet_flush(fd[1]);
1614 die(_("no matching remote head"));
1615 }
1616 prepare_shallow_info(&si, shallow);
1617 if (version == protocol_v2)
1618 ref_cpy = do_fetch_pack_v2(args, fd, ref, sought, nr_sought,
1619 pack_lockfile);
1620 else
1621 ref_cpy = do_fetch_pack(args, fd, ref, sought, nr_sought,
1622 &si, pack_lockfile);
1623 reprepare_packed_git(the_repository);
1624
1625 if (!args->cloning && args->deepen) {
1626 struct check_connected_options opt = CHECK_CONNECTED_INIT;
1627 struct ref *iterator = ref_cpy;
1628 opt.shallow_file = alternate_shallow_file;
1629 if (args->deepen)
1630 opt.is_deepening_fetch = 1;
1631 if (check_connected(iterate_ref_map, &iterator, &opt)) {
1632 error(_("remote did not send all necessary objects"));
1633 free_refs(ref_cpy);
1634 ref_cpy = NULL;
1635 rollback_lock_file(&shallow_lock);
1636 goto cleanup;
1637 }
1638 args->connectivity_checked = 1;
1639 }
1640
1641 update_shallow(args, sought, nr_sought, &si);
1642 cleanup:
1643 clear_shallow_info(&si);
1644 return ref_cpy;
1645 }
1646
1647 int report_unmatched_refs(struct ref **sought, int nr_sought)
1648 {
1649 int i, ret = 0;
1650
1651 for (i = 0; i < nr_sought; i++) {
1652 if (!sought[i])
1653 continue;
1654 switch (sought[i]->match_status) {
1655 case REF_MATCHED:
1656 continue;
1657 case REF_NOT_MATCHED:
1658 error(_("no such remote ref %s"), sought[i]->name);
1659 break;
1660 case REF_UNADVERTISED_NOT_ALLOWED:
1661 error(_("Server does not allow request for unadvertised object %s"),
1662 sought[i]->name);
1663 break;
1664 }
1665 ret = 1;
1666 }
1667 return ret;
1668 }
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