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fetch-pack: factor out is_unmatched_ref()
[git.git] / fetch-pack.c
blob3b317952f0367d1e3c70a96cb4079649645af8e5
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 char *refname,
80 const struct object_id *oid,
81 void *vcache)
82 {
83 struct alternate_object_cache *cache = vcache;
84 struct object *obj = parse_object(the_repository, oid);
85
86 if (!obj || (obj->flags & ALTERNATE))
87 return;
88
89 obj->flags |= ALTERNATE;
90 ALLOC_GROW(cache->items, cache->nr + 1, cache->alloc);
91 cache->items[cache->nr++] = obj;
92 }
93
94 static void for_each_cached_alternate(struct fetch_negotiator *negotiator,
95 void (*cb)(struct fetch_negotiator *,
96 struct object *))
97 {
98 static int initialized;
99 static struct alternate_object_cache cache;
100 size_t i;
101
102 if (!initialized) {
103 for_each_alternate_ref(cache_one_alternate, &cache);
104 initialized = 1;
105 }
106
107 for (i = 0; i < cache.nr; i++)
108 cb(negotiator, cache.items[i]);
109 }
110
111 static int rev_list_insert_ref(struct fetch_negotiator *negotiator,
112 const char *refname,
113 const struct object_id *oid)
114 {
115 struct object *o = deref_tag(the_repository,
116 parse_object(the_repository, oid),
117 refname, 0);
118
119 if (o && o->type == OBJ_COMMIT)
120 negotiator->add_tip(negotiator, (struct commit *)o);
121
122 return 0;
123 }
124
125 static int rev_list_insert_ref_oid(const char *refname, const struct object_id *oid,
126 int flag, void *cb_data)
127 {
128 return rev_list_insert_ref(cb_data, refname, oid);
129 }
130
131 enum ack_type {
132 NAK = 0,
133 ACK,
134 ACK_continue,
135 ACK_common,
136 ACK_ready
137 };
138
139 static void consume_shallow_list(struct fetch_pack_args *args, int fd)
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 char *line;
147 while ((line = packet_read_line(fd, NULL))) {
148 if (starts_with(line, "shallow "))
149 continue;
150 if (starts_with(line, "unshallow "))
151 continue;
152 die(_("git fetch-pack: expected shallow list"));
153 }
154 }
155 }
156
157 static enum ack_type get_ack(int fd, struct object_id *result_oid)
158 {
159 int len;
160 char *line = packet_read_line(fd, &len);
161 const char *arg;
162
163 if (!line)
164 die(_("git fetch-pack: expected ACK/NAK, got a flush packet"));
165 if (!strcmp(line, "NAK"))
166 return NAK;
167 if (skip_prefix(line, "ACK ", &arg)) {
168 if (!get_oid_hex(arg, result_oid)) {
169 arg += 40;
170 len -= arg - line;
171 if (len < 1)
172 return ACK;
173 if (strstr(arg, "continue"))
174 return ACK_continue;
175 if (strstr(arg, "common"))
176 return ACK_common;
177 if (strstr(arg, "ready"))
178 return ACK_ready;
179 return ACK;
180 }
181 }
182 if (skip_prefix(line, "ERR ", &arg))
183 die(_("remote error: %s"), arg);
184 die(_("git fetch-pack: expected ACK/NAK, got '%s'"), line);
185 }
186
187 static void send_request(struct fetch_pack_args *args,
188 int fd, struct strbuf *buf)
189 {
190 if (args->stateless_rpc) {
191 send_sideband(fd, -1, buf->buf, buf->len, LARGE_PACKET_MAX);
192 packet_flush(fd);
193 } else
194 write_or_die(fd, buf->buf, buf->len);
195 }
196
197 static void insert_one_alternate_object(struct fetch_negotiator *negotiator,
198 struct object *obj)
199 {
200 rev_list_insert_ref(negotiator, NULL, &obj->oid);
201 }
202
203 #define INITIAL_FLUSH 16
204 #define PIPESAFE_FLUSH 32
205 #define LARGE_FLUSH 16384
206
207 static int next_flush(int stateless_rpc, int count)
208 {
209 if (stateless_rpc) {
210 if (count < LARGE_FLUSH)
211 count <<= 1;
212 else
213 count = count * 11 / 10;
214 } else {
215 if (count < PIPESAFE_FLUSH)
216 count <<= 1;
217 else
218 count += PIPESAFE_FLUSH;
219 }
220 return count;
221 }
222
223 static void mark_tips(struct fetch_negotiator *negotiator,
224 const struct oid_array *negotiation_tips)
225 {
226 int i;
227
228 if (!negotiation_tips) {
229 for_each_ref(rev_list_insert_ref_oid, negotiator);
230 return;
231 }
232
233 for (i = 0; i < negotiation_tips->nr; i++)
234 rev_list_insert_ref(negotiator, NULL,
235 &negotiation_tips->oid[i]);
236 return;
237 }
238
239 static int find_common(struct fetch_negotiator *negotiator,
240 struct fetch_pack_args *args,
241 int fd[2], struct object_id *result_oid,
242 struct ref *refs)
243 {
244 int fetching;
245 int count = 0, flushes = 0, flush_at = INITIAL_FLUSH, retval;
246 const struct object_id *oid;
247 unsigned in_vain = 0;
248 int got_continue = 0;
249 int got_ready = 0;
250 struct strbuf req_buf = STRBUF_INIT;
251 size_t state_len = 0;
252
253 if (args->stateless_rpc && multi_ack == 1)
254 die(_("--stateless-rpc requires multi_ack_detailed"));
255
256 mark_tips(negotiator, args->negotiation_tips);
257 for_each_cached_alternate(negotiator, insert_one_alternate_object);
258
259 fetching = 0;
260 for ( ; refs ; refs = refs->next) {
261 struct object_id *remote = &refs->old_oid;
262 const char *remote_hex;
263 struct object *o;
264
265 /*
266 * If that object is complete (i.e. it is an ancestor of a
267 * local ref), we tell them we have it but do not have to
268 * tell them about its ancestors, which they already know
269 * about.
270 *
271 * We use lookup_object here because we are only
272 * interested in the case we *know* the object is
273 * reachable and we have already scanned it.
274 */
275 if (((o = lookup_object(the_repository, remote->hash)) != NULL) &&
276 (o->flags & COMPLETE)) {
277 continue;
278 }
279
280 remote_hex = oid_to_hex(remote);
281 if (!fetching) {
282 struct strbuf c = STRBUF_INIT;
283 if (multi_ack == 2) strbuf_addstr(&c, " multi_ack_detailed");
284 if (multi_ack == 1) strbuf_addstr(&c, " multi_ack");
285 if (no_done) strbuf_addstr(&c, " no-done");
286 if (use_sideband == 2) strbuf_addstr(&c, " side-band-64k");
287 if (use_sideband == 1) strbuf_addstr(&c, " side-band");
288 if (args->deepen_relative) strbuf_addstr(&c, " deepen-relative");
289 if (args->use_thin_pack) strbuf_addstr(&c, " thin-pack");
290 if (args->no_progress) strbuf_addstr(&c, " no-progress");
291 if (args->include_tag) strbuf_addstr(&c, " include-tag");
292 if (prefer_ofs_delta) strbuf_addstr(&c, " ofs-delta");
293 if (deepen_since_ok) strbuf_addstr(&c, " deepen-since");
294 if (deepen_not_ok) strbuf_addstr(&c, " deepen-not");
295 if (agent_supported) strbuf_addf(&c, " agent=%s",
296 git_user_agent_sanitized());
297 if (args->filter_options.choice)
298 strbuf_addstr(&c, " filter");
299 packet_buf_write(&req_buf, "want %s%s\n", remote_hex, c.buf);
300 strbuf_release(&c);
301 } else
302 packet_buf_write(&req_buf, "want %s\n", remote_hex);
303 fetching++;
304 }
305
306 if (!fetching) {
307 strbuf_release(&req_buf);
308 packet_flush(fd[1]);
309 return 1;
310 }
311
312 if (is_repository_shallow(the_repository))
313 write_shallow_commits(&req_buf, 1, NULL);
314 if (args->depth > 0)
315 packet_buf_write(&req_buf, "deepen %d", args->depth);
316 if (args->deepen_since) {
317 timestamp_t max_age = approxidate(args->deepen_since);
318 packet_buf_write(&req_buf, "deepen-since %"PRItime, max_age);
319 }
320 if (args->deepen_not) {
321 int i;
322 for (i = 0; i < args->deepen_not->nr; i++) {
323 struct string_list_item *s = args->deepen_not->items + i;
324 packet_buf_write(&req_buf, "deepen-not %s", s->string);
325 }
326 }
327 if (server_supports_filtering && args->filter_options.choice)
328 packet_buf_write(&req_buf, "filter %s",
329 args->filter_options.filter_spec);
330 packet_buf_flush(&req_buf);
331 state_len = req_buf.len;
332
333 if (args->deepen) {
334 char *line;
335 const char *arg;
336 struct object_id oid;
337
338 send_request(args, fd[1], &req_buf);
339 while ((line = packet_read_line(fd[0], NULL))) {
340 if (skip_prefix(line, "shallow ", &arg)) {
341 if (get_oid_hex(arg, &oid))
342 die(_("invalid shallow line: %s"), line);
343 register_shallow(the_repository, &oid);
344 continue;
345 }
346 if (skip_prefix(line, "unshallow ", &arg)) {
347 if (get_oid_hex(arg, &oid))
348 die(_("invalid unshallow line: %s"), line);
349 if (!lookup_object(the_repository, oid.hash))
350 die(_("object not found: %s"), line);
351 /* make sure that it is parsed as shallow */
352 if (!parse_object(the_repository, &oid))
353 die(_("error in object: %s"), line);
354 if (unregister_shallow(&oid))
355 die(_("no shallow found: %s"), line);
356 continue;
357 }
358 die(_("expected shallow/unshallow, got %s"), line);
359 }
360 } else if (!args->stateless_rpc)
361 send_request(args, fd[1], &req_buf);
362
363 if (!args->stateless_rpc) {
364 /* If we aren't using the stateless-rpc interface
365 * we don't need to retain the headers.
366 */
367 strbuf_setlen(&req_buf, 0);
368 state_len = 0;
369 }
370
371 flushes = 0;
372 retval = -1;
373 if (args->no_dependents)
374 goto done;
375 while ((oid = negotiator->next(negotiator))) {
376 packet_buf_write(&req_buf, "have %s\n", oid_to_hex(oid));
377 print_verbose(args, "have %s", oid_to_hex(oid));
378 in_vain++;
379 if (flush_at <= ++count) {
380 int ack;
381
382 packet_buf_flush(&req_buf);
383 send_request(args, fd[1], &req_buf);
384 strbuf_setlen(&req_buf, state_len);
385 flushes++;
386 flush_at = next_flush(args->stateless_rpc, count);
387
388 /*
389 * We keep one window "ahead" of the other side, and
390 * will wait for an ACK only on the next one
391 */
392 if (!args->stateless_rpc && count == INITIAL_FLUSH)
393 continue;
394
395 consume_shallow_list(args, fd[0]);
396 do {
397 ack = get_ack(fd[0], result_oid);
398 if (ack)
399 print_verbose(args, _("got %s %d %s"), "ack",
400 ack, oid_to_hex(result_oid));
401 switch (ack) {
402 case ACK:
403 flushes = 0;
404 multi_ack = 0;
405 retval = 0;
406 goto done;
407 case ACK_common:
408 case ACK_ready:
409 case ACK_continue: {
410 struct commit *commit =
411 lookup_commit(the_repository,
412 result_oid);
413 int was_common;
414
415 if (!commit)
416 die(_("invalid commit %s"), oid_to_hex(result_oid));
417 was_common = negotiator->ack(negotiator, commit);
418 if (args->stateless_rpc
419 && ack == ACK_common
420 && !was_common) {
421 /* We need to replay the have for this object
422 * on the next RPC request so the peer knows
423 * it is in common with us.
424 */
425 const char *hex = oid_to_hex(result_oid);
426 packet_buf_write(&req_buf, "have %s\n", hex);
427 state_len = req_buf.len;
428 /*
429 * Reset in_vain because an ack
430 * for this commit has not been
431 * seen.
432 */
433 in_vain = 0;
434 } else if (!args->stateless_rpc
435 || ack != ACK_common)
436 in_vain = 0;
437 retval = 0;
438 got_continue = 1;
439 if (ack == ACK_ready)
440 got_ready = 1;
441 break;
442 }
443 }
444 } while (ack);
445 flushes--;
446 if (got_continue && MAX_IN_VAIN < in_vain) {
447 print_verbose(args, _("giving up"));
448 break; /* give up */
449 }
450 if (got_ready)
451 break;
452 }
453 }
454 done:
455 if (!got_ready || !no_done) {
456 packet_buf_write(&req_buf, "done\n");
457 send_request(args, fd[1], &req_buf);
458 }
459 print_verbose(args, _("done"));
460 if (retval != 0) {
461 multi_ack = 0;
462 flushes++;
463 }
464 strbuf_release(&req_buf);
465
466 if (!got_ready || !no_done)
467 consume_shallow_list(args, fd[0]);
468 while (flushes || multi_ack) {
469 int ack = get_ack(fd[0], result_oid);
470 if (ack) {
471 print_verbose(args, _("got %s (%d) %s"), "ack",
472 ack, oid_to_hex(result_oid));
473 if (ack == ACK)
474 return 0;
475 multi_ack = 1;
476 continue;
477 }
478 flushes--;
479 }
480 /* it is no error to fetch into a completely empty repo */
481 return count ? retval : 0;
482 }
483
484 static struct commit_list *complete;
485
486 static int mark_complete(const struct object_id *oid)
487 {
488 struct object *o = parse_object(the_repository, oid);
489
490 while (o && o->type == OBJ_TAG) {
491 struct tag *t = (struct tag *) o;
492 if (!t->tagged)
493 break; /* broken repository */
494 o->flags |= COMPLETE;
495 o = parse_object(the_repository, &t->tagged->oid);
496 }
497 if (o && o->type == OBJ_COMMIT) {
498 struct commit *commit = (struct commit *)o;
499 if (!(commit->object.flags & COMPLETE)) {
500 commit->object.flags |= COMPLETE;
501 commit_list_insert(commit, &complete);
502 }
503 }
504 return 0;
505 }
506
507 static int mark_complete_oid(const char *refname, const struct object_id *oid,
508 int flag, void *cb_data)
509 {
510 return mark_complete(oid);
511 }
512
513 static void mark_recent_complete_commits(struct fetch_pack_args *args,
514 timestamp_t cutoff)
515 {
516 while (complete && cutoff <= complete->item->date) {
517 print_verbose(args, _("Marking %s as complete"),
518 oid_to_hex(&complete->item->object.oid));
519 pop_most_recent_commit(&complete, COMPLETE);
520 }
521 }
522
523 static void add_refs_to_oidset(struct oidset *oids, struct ref *refs)
524 {
525 for (; refs; refs = refs->next)
526 oidset_insert(oids, &refs->old_oid);
527 }
528
529 static int tip_oids_contain(struct oidset *tip_oids,
530 struct ref *unmatched, struct ref *newlist,
531 const struct object_id *id)
532 {
533 /*
534 * Note that this only looks at the ref lists the first time it's
535 * called. This works out in filter_refs() because even though it may
536 * add to "newlist" between calls, the additions will always be for
537 * oids that are already in the set.
538 */
539 if (!tip_oids->map.map.tablesize) {
540 add_refs_to_oidset(tip_oids, unmatched);
541 add_refs_to_oidset(tip_oids, newlist);
542 }
543 return oidset_contains(tip_oids, id);
544 }
545
546 static int is_unmatched_ref(const struct ref *ref)
547 {
548 struct object_id oid;
549 const char *p;
550 return ref->match_status == REF_NOT_MATCHED &&
551 !parse_oid_hex(ref->name, &oid, &p) &&
552 *p == '\0' &&
553 oideq(&oid, &ref->old_oid);
554 }
555
556 static void filter_refs(struct fetch_pack_args *args,
557 struct ref **refs,
558 struct ref **sought, int nr_sought)
559 {
560 struct ref *newlist = NULL;
561 struct ref **newtail = &newlist;
562 struct ref *unmatched = NULL;
563 struct ref *ref, *next;
564 struct oidset tip_oids = OIDSET_INIT;
565 int i;
566
567 i = 0;
568 for (ref = *refs; ref; ref = next) {
569 int keep = 0;
570 next = ref->next;
571
572 if (starts_with(ref->name, "refs/") &&
573 check_refname_format(ref->name, 0))
574 ; /* trash */
575 else {
576 while (i < nr_sought) {
577 int cmp = strcmp(ref->name, sought[i]->name);
578 if (cmp < 0)
579 break; /* definitely do not have it */
580 else if (cmp == 0) {
581 keep = 1; /* definitely have it */
582 sought[i]->match_status = REF_MATCHED;
583 }
584 i++;
585 }
586
587 if (!keep && args->fetch_all &&
588 (!args->deepen || !starts_with(ref->name, "refs/tags/")))
589 keep = 1;
590 }
591
592 if (keep) {
593 *newtail = ref;
594 ref->next = NULL;
595 newtail = &ref->next;
596 } else {
597 ref->next = unmatched;
598 unmatched = ref;
599 }
600 }
601
602 /* Append unmatched requests to the list */
603 for (i = 0; i < nr_sought; i++) {
604 ref = sought[i];
605 if (!is_unmatched_ref(ref))
606 continue;
607
608 if ((allow_unadvertised_object_request &
609 (ALLOW_TIP_SHA1 | ALLOW_REACHABLE_SHA1)) ||
610 tip_oids_contain(&tip_oids, unmatched, newlist,
611 &ref->old_oid)) {
612 ref->match_status = REF_MATCHED;
613 *newtail = copy_ref(ref);
614 newtail = &(*newtail)->next;
615 } else {
616 ref->match_status = REF_UNADVERTISED_NOT_ALLOWED;
617 }
618 }
619
620 oidset_clear(&tip_oids);
621 for (ref = unmatched; ref; ref = next) {
622 next = ref->next;
623 free(ref);
624 }
625
626 *refs = newlist;
627 }
628
629 static void mark_alternate_complete(struct fetch_negotiator *unused,
630 struct object *obj)
631 {
632 mark_complete(&obj->oid);
633 }
634
635 struct loose_object_iter {
636 struct oidset *loose_object_set;
637 struct ref *refs;
638 };
639
640 /*
641 * If the number of refs is not larger than the number of loose objects,
642 * this function stops inserting.
643 */
644 static int add_loose_objects_to_set(const struct object_id *oid,
645 const char *path,
646 void *data)
647 {
648 struct loose_object_iter *iter = data;
649 oidset_insert(iter->loose_object_set, oid);
650 if (iter->refs == NULL)
651 return 1;
652
653 iter->refs = iter->refs->next;
654 return 0;
655 }
656
657 /*
658 * Mark recent commits available locally and reachable from a local ref as
659 * COMPLETE. If args->no_dependents is false, also mark COMPLETE remote refs as
660 * COMMON_REF (otherwise, we are not planning to participate in negotiation, and
661 * thus do not need COMMON_REF marks).
662 *
663 * The cutoff time for recency is determined by this heuristic: it is the
664 * earliest commit time of the objects in refs that are commits and that we know
665 * the commit time of.
666 */
667 static void mark_complete_and_common_ref(struct fetch_negotiator *negotiator,
668 struct fetch_pack_args *args,
669 struct ref **refs)
670 {
671 struct ref *ref;
672 int old_save_commit_buffer = save_commit_buffer;
673 timestamp_t cutoff = 0;
674 struct oidset loose_oid_set = OIDSET_INIT;
675 int use_oidset = 0;
676 struct loose_object_iter iter = {&loose_oid_set, *refs};
677
678 /* Enumerate all loose objects or know refs are not so many. */
679 use_oidset = !for_each_loose_object(add_loose_objects_to_set,
680 &iter, 0);
681
682 save_commit_buffer = 0;
683
684 for (ref = *refs; ref; ref = ref->next) {
685 struct object *o;
686 unsigned int flags = OBJECT_INFO_QUICK;
687
688 if (use_oidset &&
689 !oidset_contains(&loose_oid_set, &ref->old_oid)) {
690 /*
691 * I know this does not exist in the loose form,
692 * so check if it exists in a non-loose form.
693 */
694 flags |= OBJECT_INFO_IGNORE_LOOSE;
695 }
696
697 if (!has_object_file_with_flags(&ref->old_oid, flags))
698 continue;
699 o = parse_object(the_repository, &ref->old_oid);
700 if (!o)
701 continue;
702
703 /* We already have it -- which may mean that we were
704 * in sync with the other side at some time after
705 * that (it is OK if we guess wrong here).
706 */
707 if (o->type == OBJ_COMMIT) {
708 struct commit *commit = (struct commit *)o;
709 if (!cutoff || cutoff < commit->date)
710 cutoff = commit->date;
711 }
712 }
713
714 oidset_clear(&loose_oid_set);
715
716 if (!args->no_dependents) {
717 if (!args->deepen) {
718 for_each_ref(mark_complete_oid, NULL);
719 for_each_cached_alternate(NULL, mark_alternate_complete);
720 commit_list_sort_by_date(&complete);
721 if (cutoff)
722 mark_recent_complete_commits(args, cutoff);
723 }
724
725 /*
726 * Mark all complete remote refs as common refs.
727 * Don't mark them common yet; the server has to be told so first.
728 */
729 for (ref = *refs; ref; ref = ref->next) {
730 struct object *o = deref_tag(the_repository,
731 lookup_object(the_repository,
732 ref->old_oid.hash),
733 NULL, 0);
734
735 if (!o || o->type != OBJ_COMMIT || !(o->flags & COMPLETE))
736 continue;
737
738 negotiator->known_common(negotiator,
739 (struct commit *)o);
740 }
741 }
742
743 save_commit_buffer = old_save_commit_buffer;
744 }
745
746 /*
747 * Returns 1 if every object pointed to by the given remote refs is available
748 * locally and reachable from a local ref, and 0 otherwise.
749 */
750 static int everything_local(struct fetch_pack_args *args,
751 struct ref **refs)
752 {
753 struct ref *ref;
754 int retval;
755
756 for (retval = 1, ref = *refs; ref ; ref = ref->next) {
757 const struct object_id *remote = &ref->old_oid;
758 struct object *o;
759
760 o = lookup_object(the_repository, remote->hash);
761 if (!o || !(o->flags & COMPLETE)) {
762 retval = 0;
763 print_verbose(args, "want %s (%s)", oid_to_hex(remote),
764 ref->name);
765 continue;
766 }
767 print_verbose(args, _("already have %s (%s)"), oid_to_hex(remote),
768 ref->name);
769 }
770
771 return retval;
772 }
773
774 static int sideband_demux(int in, int out, void *data)
775 {
776 int *xd = data;
777 int ret;
778
779 ret = recv_sideband("fetch-pack", xd[0], out);
780 close(out);
781 return ret;
782 }
783
784 static int get_pack(struct fetch_pack_args *args,
785 int xd[2], char **pack_lockfile)
786 {
787 struct async demux;
788 int do_keep = args->keep_pack;
789 const char *cmd_name;
790 struct pack_header header;
791 int pass_header = 0;
792 struct child_process cmd = CHILD_PROCESS_INIT;
793 int ret;
794
795 memset(&demux, 0, sizeof(demux));
796 if (use_sideband) {
797 /* xd[] is talking with upload-pack; subprocess reads from
798 * xd[0], spits out band#2 to stderr, and feeds us band#1
799 * through demux->out.
800 */
801 demux.proc = sideband_demux;
802 demux.data = xd;
803 demux.out = -1;
804 demux.isolate_sigpipe = 1;
805 if (start_async(&demux))
806 die(_("fetch-pack: unable to fork off sideband demultiplexer"));
807 }
808 else
809 demux.out = xd[0];
810
811 if (!args->keep_pack && unpack_limit) {
812
813 if (read_pack_header(demux.out, &header))
814 die(_("protocol error: bad pack header"));
815 pass_header = 1;
816 if (ntohl(header.hdr_entries) < unpack_limit)
817 do_keep = 0;
818 else
819 do_keep = 1;
820 }
821
822 if (alternate_shallow_file) {
823 argv_array_push(&cmd.args, "--shallow-file");
824 argv_array_push(&cmd.args, alternate_shallow_file);
825 }
826
827 if (do_keep || args->from_promisor) {
828 if (pack_lockfile)
829 cmd.out = -1;
830 cmd_name = "index-pack";
831 argv_array_push(&cmd.args, cmd_name);
832 argv_array_push(&cmd.args, "--stdin");
833 if (!args->quiet && !args->no_progress)
834 argv_array_push(&cmd.args, "-v");
835 if (args->use_thin_pack)
836 argv_array_push(&cmd.args, "--fix-thin");
837 if (do_keep && (args->lock_pack || unpack_limit)) {
838 char hostname[HOST_NAME_MAX + 1];
839 if (xgethostname(hostname, sizeof(hostname)))
840 xsnprintf(hostname, sizeof(hostname), "localhost");
841 argv_array_pushf(&cmd.args,
842 "--keep=fetch-pack %"PRIuMAX " on %s",
843 (uintmax_t)getpid(), hostname);
844 }
845 if (args->check_self_contained_and_connected)
846 argv_array_push(&cmd.args, "--check-self-contained-and-connected");
847 if (args->from_promisor)
848 argv_array_push(&cmd.args, "--promisor");
849 }
850 else {
851 cmd_name = "unpack-objects";
852 argv_array_push(&cmd.args, cmd_name);
853 if (args->quiet || args->no_progress)
854 argv_array_push(&cmd.args, "-q");
855 args->check_self_contained_and_connected = 0;
856 }
857
858 if (pass_header)
859 argv_array_pushf(&cmd.args, "--pack_header=%"PRIu32",%"PRIu32,
860 ntohl(header.hdr_version),
861 ntohl(header.hdr_entries));
862 if (fetch_fsck_objects >= 0
863 ? fetch_fsck_objects
864 : transfer_fsck_objects >= 0
865 ? transfer_fsck_objects
866 : 0) {
867 if (args->from_promisor)
868 /*
869 * We cannot use --strict in index-pack because it
870 * checks both broken objects and links, but we only
871 * want to check for broken objects.
872 */
873 argv_array_push(&cmd.args, "--fsck-objects");
874 else
875 argv_array_pushf(&cmd.args, "--strict%s",
876 fsck_msg_types.buf);
877 }
878
879 cmd.in = demux.out;
880 cmd.git_cmd = 1;
881 if (start_command(&cmd))
882 die(_("fetch-pack: unable to fork off %s"), cmd_name);
883 if (do_keep && pack_lockfile) {
884 *pack_lockfile = index_pack_lockfile(cmd.out);
885 close(cmd.out);
886 }
887
888 if (!use_sideband)
889 /* Closed by start_command() */
890 xd[0] = -1;
891
892 ret = finish_command(&cmd);
893 if (!ret || (args->check_self_contained_and_connected && ret == 1))
894 args->self_contained_and_connected =
895 args->check_self_contained_and_connected &&
896 ret == 0;
897 else
898 die(_("%s failed"), cmd_name);
899 if (use_sideband && finish_async(&demux))
900 die(_("error in sideband demultiplexer"));
901 return 0;
902 }
903
904 static int cmp_ref_by_name(const void *a_, const void *b_)
905 {
906 const struct ref *a = *((const struct ref **)a_);
907 const struct ref *b = *((const struct ref **)b_);
908 return strcmp(a->name, b->name);
909 }
910
911 static struct ref *do_fetch_pack(struct fetch_pack_args *args,
912 int fd[2],
913 const struct ref *orig_ref,
914 struct ref **sought, int nr_sought,
915 struct shallow_info *si,
916 char **pack_lockfile)
917 {
918 struct ref *ref = copy_ref_list(orig_ref);
919 struct object_id oid;
920 const char *agent_feature;
921 int agent_len;
922 struct fetch_negotiator negotiator;
923 fetch_negotiator_init(&negotiator, negotiation_algorithm);
924
925 sort_ref_list(&ref, ref_compare_name);
926 QSORT(sought, nr_sought, cmp_ref_by_name);
927
928 if ((args->depth > 0 || is_repository_shallow(the_repository)) && !server_supports("shallow"))
929 die(_("Server does not support shallow clients"));
930 if (args->depth > 0 || args->deepen_since || args->deepen_not)
931 args->deepen = 1;
932 if (server_supports("multi_ack_detailed")) {
933 print_verbose(args, _("Server supports multi_ack_detailed"));
934 multi_ack = 2;
935 if (server_supports("no-done")) {
936 print_verbose(args, _("Server supports no-done"));
937 if (args->stateless_rpc)
938 no_done = 1;
939 }
940 }
941 else if (server_supports("multi_ack")) {
942 print_verbose(args, _("Server supports multi_ack"));
943 multi_ack = 1;
944 }
945 if (server_supports("side-band-64k")) {
946 print_verbose(args, _("Server supports side-band-64k"));
947 use_sideband = 2;
948 }
949 else if (server_supports("side-band")) {
950 print_verbose(args, _("Server supports side-band"));
951 use_sideband = 1;
952 }
953 if (server_supports("allow-tip-sha1-in-want")) {
954 print_verbose(args, _("Server supports allow-tip-sha1-in-want"));
955 allow_unadvertised_object_request |= ALLOW_TIP_SHA1;
956 }
957 if (server_supports("allow-reachable-sha1-in-want")) {
958 print_verbose(args, _("Server supports allow-reachable-sha1-in-want"));
959 allow_unadvertised_object_request |= ALLOW_REACHABLE_SHA1;
960 }
961 if (!server_supports("thin-pack"))
962 args->use_thin_pack = 0;
963 if (!server_supports("no-progress"))
964 args->no_progress = 0;
965 if (!server_supports("include-tag"))
966 args->include_tag = 0;
967 if (server_supports("ofs-delta"))
968 print_verbose(args, _("Server supports ofs-delta"));
969 else
970 prefer_ofs_delta = 0;
971
972 if (server_supports("filter")) {
973 server_supports_filtering = 1;
974 print_verbose(args, _("Server supports filter"));
975 } else if (args->filter_options.choice) {
976 warning("filtering not recognized by server, ignoring");
977 }
978
979 if ((agent_feature = server_feature_value("agent", &agent_len))) {
980 agent_supported = 1;
981 if (agent_len)
982 print_verbose(args, _("Server version is %.*s"),
983 agent_len, agent_feature);
984 }
985 if (server_supports("deepen-since"))
986 deepen_since_ok = 1;
987 else if (args->deepen_since)
988 die(_("Server does not support --shallow-since"));
989 if (server_supports("deepen-not"))
990 deepen_not_ok = 1;
991 else if (args->deepen_not)
992 die(_("Server does not support --shallow-exclude"));
993 if (!server_supports("deepen-relative") && args->deepen_relative)
994 die(_("Server does not support --deepen"));
995
996 mark_complete_and_common_ref(&negotiator, args, &ref);
997 filter_refs(args, &ref, sought, nr_sought);
998 if (everything_local(args, &ref)) {
999 packet_flush(fd[1]);
1000 goto all_done;
1001 }
1002 if (find_common(&negotiator, args, fd, &oid, ref) < 0)
1003 if (!args->keep_pack)
1004 /* When cloning, it is not unusual to have
1005 * no common commit.
1006 */
1007 warning(_("no common commits"));
1008
1009 if (args->stateless_rpc)
1010 packet_flush(fd[1]);
1011 if (args->deepen)
1012 setup_alternate_shallow(&shallow_lock, &alternate_shallow_file,
1013 NULL);
1014 else if (si->nr_ours || si->nr_theirs)
1015 alternate_shallow_file = setup_temporary_shallow(si->shallow);
1016 else
1017 alternate_shallow_file = NULL;
1018 if (get_pack(args, fd, pack_lockfile))
1019 die(_("git fetch-pack: fetch failed."));
1020
1021 all_done:
1022 negotiator.release(&negotiator);
1023 return ref;
1024 }
1025
1026 static void add_shallow_requests(struct strbuf *req_buf,
1027 const struct fetch_pack_args *args)
1028 {
1029 if (is_repository_shallow(the_repository))
1030 write_shallow_commits(req_buf, 1, NULL);
1031 if (args->depth > 0)
1032 packet_buf_write(req_buf, "deepen %d", args->depth);
1033 if (args->deepen_since) {
1034 timestamp_t max_age = approxidate(args->deepen_since);
1035 packet_buf_write(req_buf, "deepen-since %"PRItime, max_age);
1036 }
1037 if (args->deepen_not) {
1038 int i;
1039 for (i = 0; i < args->deepen_not->nr; i++) {
1040 struct string_list_item *s = args->deepen_not->items + i;
1041 packet_buf_write(req_buf, "deepen-not %s", s->string);
1042 }
1043 }
1044 }
1045
1046 static void add_wants(const struct ref *wants, struct strbuf *req_buf)
1047 {
1048 int use_ref_in_want = server_supports_feature("fetch", "ref-in-want", 0);
1049
1050 for ( ; wants ; wants = wants->next) {
1051 const struct object_id *remote = &wants->old_oid;
1052 struct object *o;
1053
1054 /*
1055 * If that object is complete (i.e. it is an ancestor of a
1056 * local ref), we tell them we have it but do not have to
1057 * tell them about its ancestors, which they already know
1058 * about.
1059 *
1060 * We use lookup_object here because we are only
1061 * interested in the case we *know* the object is
1062 * reachable and we have already scanned it.
1063 */
1064 if (((o = lookup_object(the_repository, remote->hash)) != NULL) &&
1065 (o->flags & COMPLETE)) {
1066 continue;
1067 }
1068
1069 if (!use_ref_in_want || wants->exact_oid)
1070 packet_buf_write(req_buf, "want %s\n", oid_to_hex(remote));
1071 else
1072 packet_buf_write(req_buf, "want-ref %s\n", wants->name);
1073 }
1074 }
1075
1076 static void add_common(struct strbuf *req_buf, struct oidset *common)
1077 {
1078 struct oidset_iter iter;
1079 const struct object_id *oid;
1080 oidset_iter_init(common, &iter);
1081
1082 while ((oid = oidset_iter_next(&iter))) {
1083 packet_buf_write(req_buf, "have %s\n", oid_to_hex(oid));
1084 }
1085 }
1086
1087 static int add_haves(struct fetch_negotiator *negotiator,
1088 struct strbuf *req_buf,
1089 int *haves_to_send, int *in_vain)
1090 {
1091 int ret = 0;
1092 int haves_added = 0;
1093 const struct object_id *oid;
1094
1095 while ((oid = negotiator->next(negotiator))) {
1096 packet_buf_write(req_buf, "have %s\n", oid_to_hex(oid));
1097 if (++haves_added >= *haves_to_send)
1098 break;
1099 }
1100
1101 *in_vain += haves_added;
1102 if (!haves_added || *in_vain >= MAX_IN_VAIN) {
1103 /* Send Done */
1104 packet_buf_write(req_buf, "done\n");
1105 ret = 1;
1106 }
1107
1108 /* Increase haves to send on next round */
1109 *haves_to_send = next_flush(1, *haves_to_send);
1110
1111 return ret;
1112 }
1113
1114 static int send_fetch_request(struct fetch_negotiator *negotiator, int fd_out,
1115 const struct fetch_pack_args *args,
1116 const struct ref *wants, struct oidset *common,
1117 int *haves_to_send, int *in_vain)
1118 {
1119 int ret = 0;
1120 struct strbuf req_buf = STRBUF_INIT;
1121
1122 if (server_supports_v2("fetch", 1))
1123 packet_buf_write(&req_buf, "command=fetch");
1124 if (server_supports_v2("agent", 0))
1125 packet_buf_write(&req_buf, "agent=%s", git_user_agent_sanitized());
1126 if (args->server_options && args->server_options->nr &&
1127 server_supports_v2("server-option", 1)) {
1128 int i;
1129 for (i = 0; i < args->server_options->nr; i++)
1130 packet_write_fmt(fd_out, "server-option=%s",
1131 args->server_options->items[i].string);
1132 }
1133
1134 packet_buf_delim(&req_buf);
1135 if (args->use_thin_pack)
1136 packet_buf_write(&req_buf, "thin-pack");
1137 if (args->no_progress)
1138 packet_buf_write(&req_buf, "no-progress");
1139 if (args->include_tag)
1140 packet_buf_write(&req_buf, "include-tag");
1141 if (prefer_ofs_delta)
1142 packet_buf_write(&req_buf, "ofs-delta");
1143
1144 /* Add shallow-info and deepen request */
1145 if (server_supports_feature("fetch", "shallow", 0))
1146 add_shallow_requests(&req_buf, args);
1147 else if (is_repository_shallow(the_repository) || args->deepen)
1148 die(_("Server does not support shallow requests"));
1149
1150 /* Add filter */
1151 if (server_supports_feature("fetch", "filter", 0) &&
1152 args->filter_options.choice) {
1153 print_verbose(args, _("Server supports filter"));
1154 packet_buf_write(&req_buf, "filter %s",
1155 args->filter_options.filter_spec);
1156 } else if (args->filter_options.choice) {
1157 warning("filtering not recognized by server, ignoring");
1158 }
1159
1160 /* add wants */
1161 add_wants(wants, &req_buf);
1162
1163 if (args->no_dependents) {
1164 packet_buf_write(&req_buf, "done");
1165 ret = 1;
1166 } else {
1167 /* Add all of the common commits we've found in previous rounds */
1168 add_common(&req_buf, common);
1169
1170 /* Add initial haves */
1171 ret = add_haves(negotiator, &req_buf, haves_to_send, in_vain);
1172 }
1173
1174 /* Send request */
1175 packet_buf_flush(&req_buf);
1176 write_or_die(fd_out, req_buf.buf, req_buf.len);
1177
1178 strbuf_release(&req_buf);
1179 return ret;
1180 }
1181
1182 /*
1183 * Processes a section header in a server's response and checks if it matches
1184 * `section`. If the value of `peek` is 1, the header line will be peeked (and
1185 * not consumed); if 0, the line will be consumed and the function will die if
1186 * the section header doesn't match what was expected.
1187 */
1188 static int process_section_header(struct packet_reader *reader,
1189 const char *section, int peek)
1190 {
1191 int ret;
1192
1193 if (packet_reader_peek(reader) != PACKET_READ_NORMAL)
1194 die(_("error reading section header '%s'"), section);
1195
1196 ret = !strcmp(reader->line, section);
1197
1198 if (!peek) {
1199 if (!ret)
1200 die(_("expected '%s', received '%s'"),
1201 section, reader->line);
1202 packet_reader_read(reader);
1203 }
1204
1205 return ret;
1206 }
1207
1208 static int process_acks(struct fetch_negotiator *negotiator,
1209 struct packet_reader *reader,
1210 struct oidset *common)
1211 {
1212 /* received */
1213 int received_ready = 0;
1214 int received_ack = 0;
1215
1216 process_section_header(reader, "acknowledgments", 0);
1217 while (packet_reader_read(reader) == PACKET_READ_NORMAL) {
1218 const char *arg;
1219
1220 if (!strcmp(reader->line, "NAK"))
1221 continue;
1222
1223 if (skip_prefix(reader->line, "ACK ", &arg)) {
1224 struct object_id oid;
1225 if (!get_oid_hex(arg, &oid)) {
1226 struct commit *commit;
1227 oidset_insert(common, &oid);
1228 commit = lookup_commit(the_repository, &oid);
1229 negotiator->ack(negotiator, commit);
1230 }
1231 continue;
1232 }
1233
1234 if (!strcmp(reader->line, "ready")) {
1235 received_ready = 1;
1236 continue;
1237 }
1238
1239 die(_("unexpected acknowledgment line: '%s'"), reader->line);
1240 }
1241
1242 if (reader->status != PACKET_READ_FLUSH &&
1243 reader->status != PACKET_READ_DELIM)
1244 die(_("error processing acks: %d"), reader->status);
1245
1246 /* return 0 if no common, 1 if there are common, or 2 if ready */
1247 return received_ready ? 2 : (received_ack ? 1 : 0);
1248 }
1249
1250 static void receive_shallow_info(struct fetch_pack_args *args,
1251 struct packet_reader *reader)
1252 {
1253 process_section_header(reader, "shallow-info", 0);
1254 while (packet_reader_read(reader) == PACKET_READ_NORMAL) {
1255 const char *arg;
1256 struct object_id oid;
1257
1258 if (skip_prefix(reader->line, "shallow ", &arg)) {
1259 if (get_oid_hex(arg, &oid))
1260 die(_("invalid shallow line: %s"), reader->line);
1261 register_shallow(the_repository, &oid);
1262 continue;
1263 }
1264 if (skip_prefix(reader->line, "unshallow ", &arg)) {
1265 if (get_oid_hex(arg, &oid))
1266 die(_("invalid unshallow line: %s"), reader->line);
1267 if (!lookup_object(the_repository, oid.hash))
1268 die(_("object not found: %s"), reader->line);
1269 /* make sure that it is parsed as shallow */
1270 if (!parse_object(the_repository, &oid))
1271 die(_("error in object: %s"), reader->line);
1272 if (unregister_shallow(&oid))
1273 die(_("no shallow found: %s"), reader->line);
1274 continue;
1275 }
1276 die(_("expected shallow/unshallow, got %s"), reader->line);
1277 }
1278
1279 if (reader->status != PACKET_READ_FLUSH &&
1280 reader->status != PACKET_READ_DELIM)
1281 die(_("error processing shallow info: %d"), reader->status);
1282
1283 setup_alternate_shallow(&shallow_lock, &alternate_shallow_file, NULL);
1284 args->deepen = 1;
1285 }
1286
1287 static void receive_wanted_refs(struct packet_reader *reader,
1288 struct ref **sought, int nr_sought)
1289 {
1290 process_section_header(reader, "wanted-refs", 0);
1291 while (packet_reader_read(reader) == PACKET_READ_NORMAL) {
1292 struct object_id oid;
1293 const char *end;
1294 int i;
1295
1296 if (parse_oid_hex(reader->line, &oid, &end) || *end++ != ' ')
1297 die(_("expected wanted-ref, got '%s'"), reader->line);
1298
1299 for (i = 0; i < nr_sought; i++) {
1300 if (!strcmp(end, sought[i]->name)) {
1301 oidcpy(&sought[i]->old_oid, &oid);
1302 break;
1303 }
1304 }
1305
1306 if (i == nr_sought)
1307 die(_("unexpected wanted-ref: '%s'"), reader->line);
1308 }
1309
1310 if (reader->status != PACKET_READ_DELIM)
1311 die(_("error processing wanted refs: %d"), reader->status);
1312 }
1313
1314 enum fetch_state {
1315 FETCH_CHECK_LOCAL = 0,
1316 FETCH_SEND_REQUEST,
1317 FETCH_PROCESS_ACKS,
1318 FETCH_GET_PACK,
1319 FETCH_DONE,
1320 };
1321
1322 static struct ref *do_fetch_pack_v2(struct fetch_pack_args *args,
1323 int fd[2],
1324 const struct ref *orig_ref,
1325 struct ref **sought, int nr_sought,
1326 char **pack_lockfile)
1327 {
1328 struct ref *ref = copy_ref_list(orig_ref);
1329 enum fetch_state state = FETCH_CHECK_LOCAL;
1330 struct oidset common = OIDSET_INIT;
1331 struct packet_reader reader;
1332 int in_vain = 0;
1333 int haves_to_send = INITIAL_FLUSH;
1334 struct fetch_negotiator negotiator;
1335 fetch_negotiator_init(&negotiator, negotiation_algorithm);
1336 packet_reader_init(&reader, fd[0], NULL, 0,
1337 PACKET_READ_CHOMP_NEWLINE);
1338
1339 while (state != FETCH_DONE) {
1340 switch (state) {
1341 case FETCH_CHECK_LOCAL:
1342 sort_ref_list(&ref, ref_compare_name);
1343 QSORT(sought, nr_sought, cmp_ref_by_name);
1344
1345 /* v2 supports these by default */
1346 allow_unadvertised_object_request |= ALLOW_REACHABLE_SHA1;
1347 use_sideband = 2;
1348 if (args->depth > 0 || args->deepen_since || args->deepen_not)
1349 args->deepen = 1;
1350
1351 /* Filter 'ref' by 'sought' and those that aren't local */
1352 mark_complete_and_common_ref(&negotiator, args, &ref);
1353 filter_refs(args, &ref, sought, nr_sought);
1354 if (everything_local(args, &ref))
1355 state = FETCH_DONE;
1356 else
1357 state = FETCH_SEND_REQUEST;
1358
1359 mark_tips(&negotiator, args->negotiation_tips);
1360 for_each_cached_alternate(&negotiator,
1361 insert_one_alternate_object);
1362 break;
1363 case FETCH_SEND_REQUEST:
1364 if (send_fetch_request(&negotiator, fd[1], args, ref,
1365 &common,
1366 &haves_to_send, &in_vain))
1367 state = FETCH_GET_PACK;
1368 else
1369 state = FETCH_PROCESS_ACKS;
1370 break;
1371 case FETCH_PROCESS_ACKS:
1372 /* Process ACKs/NAKs */
1373 switch (process_acks(&negotiator, &reader, &common)) {
1374 case 2:
1375 state = FETCH_GET_PACK;
1376 break;
1377 case 1:
1378 in_vain = 0;
1379 /* fallthrough */
1380 default:
1381 state = FETCH_SEND_REQUEST;
1382 break;
1383 }
1384 break;
1385 case FETCH_GET_PACK:
1386 /* Check for shallow-info section */
1387 if (process_section_header(&reader, "shallow-info", 1))
1388 receive_shallow_info(args, &reader);
1389
1390 if (process_section_header(&reader, "wanted-refs", 1))
1391 receive_wanted_refs(&reader, sought, nr_sought);
1392
1393 /* get the pack */
1394 process_section_header(&reader, "packfile", 0);
1395 if (get_pack(args, fd, pack_lockfile))
1396 die(_("git fetch-pack: fetch failed."));
1397
1398 state = FETCH_DONE;
1399 break;
1400 case FETCH_DONE:
1401 continue;
1402 }
1403 }
1404
1405 negotiator.release(&negotiator);
1406 oidset_clear(&common);
1407 return ref;
1408 }
1409
1410 static int fetch_pack_config_cb(const char *var, const char *value, void *cb)
1411 {
1412 if (strcmp(var, "fetch.fsck.skiplist") == 0) {
1413 const char *path;
1414
1415 if (git_config_pathname(&path, var, value))
1416 return 1;
1417 strbuf_addf(&fsck_msg_types, "%cskiplist=%s",
1418 fsck_msg_types.len ? ',' : '=', path);
1419 free((char *)path);
1420 return 0;
1421 }
1422
1423 if (skip_prefix(var, "fetch.fsck.", &var)) {
1424 if (is_valid_msg_type(var, value))
1425 strbuf_addf(&fsck_msg_types, "%c%s=%s",
1426 fsck_msg_types.len ? ',' : '=', var, value);
1427 else
1428 warning("Skipping unknown msg id '%s'", var);
1429 return 0;
1430 }
1431
1432 return git_default_config(var, value, cb);
1433 }
1434
1435 static void fetch_pack_config(void)
1436 {
1437 git_config_get_int("fetch.unpacklimit", &fetch_unpack_limit);
1438 git_config_get_int("transfer.unpacklimit", &transfer_unpack_limit);
1439 git_config_get_bool("repack.usedeltabaseoffset", &prefer_ofs_delta);
1440 git_config_get_bool("fetch.fsckobjects", &fetch_fsck_objects);
1441 git_config_get_bool("transfer.fsckobjects", &transfer_fsck_objects);
1442 git_config_get_string("fetch.negotiationalgorithm",
1443 &negotiation_algorithm);
1444
1445 git_config(fetch_pack_config_cb, NULL);
1446 }
1447
1448 static void fetch_pack_setup(void)
1449 {
1450 static int did_setup;
1451 if (did_setup)
1452 return;
1453 fetch_pack_config();
1454 if (0 <= transfer_unpack_limit)
1455 unpack_limit = transfer_unpack_limit;
1456 else if (0 <= fetch_unpack_limit)
1457 unpack_limit = fetch_unpack_limit;
1458 did_setup = 1;
1459 }
1460
1461 static int remove_duplicates_in_refs(struct ref **ref, int nr)
1462 {
1463 struct string_list names = STRING_LIST_INIT_NODUP;
1464 int src, dst;
1465
1466 for (src = dst = 0; src < nr; src++) {
1467 struct string_list_item *item;
1468 item = string_list_insert(&names, ref[src]->name);
1469 if (item->util)
1470 continue; /* already have it */
1471 item->util = ref[src];
1472 if (src != dst)
1473 ref[dst] = ref[src];
1474 dst++;
1475 }
1476 for (src = dst; src < nr; src++)
1477 ref[src] = NULL;
1478 string_list_clear(&names, 0);
1479 return dst;
1480 }
1481
1482 static void update_shallow(struct fetch_pack_args *args,
1483 struct ref **sought, int nr_sought,
1484 struct shallow_info *si)
1485 {
1486 struct oid_array ref = OID_ARRAY_INIT;
1487 int *status;
1488 int i;
1489
1490 if (args->deepen && alternate_shallow_file) {
1491 if (*alternate_shallow_file == '\0') { /* --unshallow */
1492 unlink_or_warn(git_path_shallow(the_repository));
1493 rollback_lock_file(&shallow_lock);
1494 } else
1495 commit_lock_file(&shallow_lock);
1496 return;
1497 }
1498
1499 if (!si->shallow || !si->shallow->nr)
1500 return;
1501
1502 if (args->cloning) {
1503 /*
1504 * remote is shallow, but this is a clone, there are
1505 * no objects in repo to worry about. Accept any
1506 * shallow points that exist in the pack (iow in repo
1507 * after get_pack() and reprepare_packed_git())
1508 */
1509 struct oid_array extra = OID_ARRAY_INIT;
1510 struct object_id *oid = si->shallow->oid;
1511 for (i = 0; i < si->shallow->nr; i++)
1512 if (has_object_file(&oid[i]))
1513 oid_array_append(&extra, &oid[i]);
1514 if (extra.nr) {
1515 setup_alternate_shallow(&shallow_lock,
1516 &alternate_shallow_file,
1517 &extra);
1518 commit_lock_file(&shallow_lock);
1519 }
1520 oid_array_clear(&extra);
1521 return;
1522 }
1523
1524 if (!si->nr_ours && !si->nr_theirs)
1525 return;
1526
1527 remove_nonexistent_theirs_shallow(si);
1528 if (!si->nr_ours && !si->nr_theirs)
1529 return;
1530 for (i = 0; i < nr_sought; i++)
1531 oid_array_append(&ref, &sought[i]->old_oid);
1532 si->ref = &ref;
1533
1534 if (args->update_shallow) {
1535 /*
1536 * remote is also shallow, .git/shallow may be updated
1537 * so all refs can be accepted. Make sure we only add
1538 * shallow roots that are actually reachable from new
1539 * refs.
1540 */
1541 struct oid_array extra = OID_ARRAY_INIT;
1542 struct object_id *oid = si->shallow->oid;
1543 assign_shallow_commits_to_refs(si, NULL, NULL);
1544 if (!si->nr_ours && !si->nr_theirs) {
1545 oid_array_clear(&ref);
1546 return;
1547 }
1548 for (i = 0; i < si->nr_ours; i++)
1549 oid_array_append(&extra, &oid[si->ours[i]]);
1550 for (i = 0; i < si->nr_theirs; i++)
1551 oid_array_append(&extra, &oid[si->theirs[i]]);
1552 setup_alternate_shallow(&shallow_lock,
1553 &alternate_shallow_file,
1554 &extra);
1555 commit_lock_file(&shallow_lock);
1556 oid_array_clear(&extra);
1557 oid_array_clear(&ref);
1558 return;
1559 }
1560
1561 /*
1562 * remote is also shallow, check what ref is safe to update
1563 * without updating .git/shallow
1564 */
1565 status = xcalloc(nr_sought, sizeof(*status));
1566 assign_shallow_commits_to_refs(si, NULL, status);
1567 if (si->nr_ours || si->nr_theirs) {
1568 for (i = 0; i < nr_sought; i++)
1569 if (status[i])
1570 sought[i]->status = REF_STATUS_REJECT_SHALLOW;
1571 }
1572 free(status);
1573 oid_array_clear(&ref);
1574 }
1575
1576 static int iterate_ref_map(void *cb_data, struct object_id *oid)
1577 {
1578 struct ref **rm = cb_data;
1579 struct ref *ref = *rm;
1580
1581 if (!ref)
1582 return -1; /* end of the list */
1583 *rm = ref->next;
1584 oidcpy(oid, &ref->old_oid);
1585 return 0;
1586 }
1587
1588 struct ref *fetch_pack(struct fetch_pack_args *args,
1589 int fd[], struct child_process *conn,
1590 const struct ref *ref,
1591 const char *dest,
1592 struct ref **sought, int nr_sought,
1593 struct oid_array *shallow,
1594 char **pack_lockfile,
1595 enum protocol_version version)
1596 {
1597 struct ref *ref_cpy;
1598 struct shallow_info si;
1599
1600 fetch_pack_setup();
1601 if (nr_sought)
1602 nr_sought = remove_duplicates_in_refs(sought, nr_sought);
1603
1604 if (!ref) {
1605 packet_flush(fd[1]);
1606 die(_("no matching remote head"));
1607 }
1608 prepare_shallow_info(&si, shallow);
1609 if (version == protocol_v2)
1610 ref_cpy = do_fetch_pack_v2(args, fd, ref, sought, nr_sought,
1611 pack_lockfile);
1612 else
1613 ref_cpy = do_fetch_pack(args, fd, ref, sought, nr_sought,
1614 &si, pack_lockfile);
1615 reprepare_packed_git(the_repository);
1616
1617 if (!args->cloning && args->deepen) {
1618 struct check_connected_options opt = CHECK_CONNECTED_INIT;
1619 struct ref *iterator = ref_cpy;
1620 opt.shallow_file = alternate_shallow_file;
1621 if (args->deepen)
1622 opt.is_deepening_fetch = 1;
1623 if (check_connected(iterate_ref_map, &iterator, &opt)) {
1624 error(_("remote did not send all necessary objects"));
1625 free_refs(ref_cpy);
1626 ref_cpy = NULL;
1627 rollback_lock_file(&shallow_lock);
1628 goto cleanup;
1629 }
1630 args->connectivity_checked = 1;
1631 }
1632
1633 update_shallow(args, sought, nr_sought, &si);
1634 cleanup:
1635 clear_shallow_info(&si);
1636 return ref_cpy;
1637 }
1638
1639 int report_unmatched_refs(struct ref **sought, int nr_sought)
1640 {
1641 int i, ret = 0;
1642
1643 for (i = 0; i < nr_sought; i++) {
1644 if (!sought[i])
1645 continue;
1646 switch (sought[i]->match_status) {
1647 case REF_MATCHED:
1648 continue;
1649 case REF_NOT_MATCHED:
1650 error(_("no such remote ref %s"), sought[i]->name);
1651 break;
1652 case REF_UNADVERTISED_NOT_ALLOWED:
1653 error(_("Server does not allow request for unadvertised object %s"),
1654 sought[i]->name);
1655 break;
1656 }
1657 ret = 1;
1658 }
1659 return ret;
1660 }
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