86790b9bbad5a97c2dd4afaa42f9ccfca406b1b9
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"
25static int transfer_unpack_limit = -1;
27static int fetch_unpack_limit = -1;
28static int unpack_limit = 100;
29static int prefer_ofs_delta = 1;
30static int no_done;
31static int deepen_since_ok;
32static int deepen_not_ok;
33static int fetch_fsck_objects = -1;
34static int transfer_fsck_objects = -1;
35static int agent_supported;
36static int server_supports_filtering;
37static struct lock_file shallow_lock;
38static const char *alternate_shallow_file;
39static char *negotiation_algorithm;
40static struct strbuf fsck_msg_types = STRBUF_INIT;
41/* Remember to update object flag allocation in object.h */
43#define COMPLETE (1U << 0)
44#define ALTERNATE (1U << 1)
45/*
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
51static 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
57static unsigned int allow_unadvertised_object_request;
58__attribute__((format (printf, 2, 3)))
60static inline void print_verbose(const struct fetch_pack_args *args,
61 const char *fmt, ...)
62{
63 va_list params;
64 if (!args->verbose)
66 return;
67 va_start(params, fmt);
69 vfprintf(stderr, fmt, params);
70 va_end(params);
71 fputc('\n', stderr);
72}
73struct alternate_object_cache {
75 struct object **items;
76 size_t nr, alloc;
77};
78static 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 if (!obj || (obj->flags & ALTERNATE))
86 return;
87 obj->flags |= ALTERNATE;
89 ALLOC_GROW(cache->items, cache->nr + 1, cache->alloc);
90 cache->items[cache->nr++] = obj;
91}
92static 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 if (!initialized) {
102 for_each_alternate_ref(cache_one_alternate, &cache);
103 initialized = 1;
104 }
105 for (i = 0; i < cache.nr; i++)
107 cb(negotiator, cache.items[i]);
108}
109static 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 if (o && o->type == OBJ_COMMIT)
119 negotiator->add_tip(negotiator, (struct commit *)o);
120 return 0;
122}
123static 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}
129enum ack_type {
131 NAK = 0,
132 ACK,
133 ACK_continue,
134 ACK_common,
135 ACK_ready
136};
137static 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}
157static enum ack_type get_ack(struct packet_reader *reader,
159 struct object_id *result_oid)
160{
161 int len;
162 const char *arg;
163 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 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 if (skip_prefix(reader->line, "ERR ", &arg))
186 die(_("remote error: %s"), arg);
187 die(_("git fetch-pack: expected ACK/NAK, got '%s'"), reader->line);
188}
189static void send_request(struct fetch_pack_args *args,
191 int fd, struct strbuf *buf)
192{
193 if (args->stateless_rpc) {
194 send_sideband(fd, -1, buf->buf, buf->len, LARGE_PACKET_MAX);
195 packet_flush(fd);
196 } else
197 write_or_die(fd, buf->buf, buf->len);
198}
199static void insert_one_alternate_object(struct fetch_negotiator *negotiator,
201 struct object *obj)
202{
203 rev_list_insert_ref(negotiator, NULL, &obj->oid);
204}
205#define INITIAL_FLUSH 16
207#define PIPESAFE_FLUSH 32
208#define LARGE_FLUSH 16384
209static int next_flush(int stateless_rpc, int count)
211{
212 if (stateless_rpc) {
213 if (count < LARGE_FLUSH)
214 count <<= 1;
215 else
216 count = count * 11 / 10;
217 } else {
218 if (count < PIPESAFE_FLUSH)
219 count <<= 1;
220 else
221 count += PIPESAFE_FLUSH;
222 }
223 return count;
224}
225static void mark_tips(struct fetch_negotiator *negotiator,
227 const struct oid_array *negotiation_tips)
228{
229 int i;
230 if (!negotiation_tips) {
232 for_each_ref(rev_list_insert_ref_oid, negotiator);
233 return;
234 }
235 for (i = 0; i < negotiation_tips->nr; i++)
237 rev_list_insert_ref(negotiator, NULL,
238 &negotiation_tips->oid[i]);
239 return;
240}
241static int find_common(struct fetch_negotiator *negotiator,
243 struct fetch_pack_args *args,
244 int fd[2], struct object_id *result_oid,
245 struct ref *refs)
246{
247 int fetching;
248 int count = 0, flushes = 0, flush_at = INITIAL_FLUSH, retval;
249 const struct object_id *oid;
250 unsigned in_vain = 0;
251 int got_continue = 0;
252 int got_ready = 0;
253 struct strbuf req_buf = STRBUF_INIT;
254 size_t state_len = 0;
255 struct packet_reader reader;
256 if (args->stateless_rpc && multi_ack == 1)
258 die(_("--stateless-rpc requires multi_ack_detailed"));
259 packet_reader_init(&reader, fd[0], NULL, 0,
261 PACKET_READ_CHOMP_NEWLINE);
262 if (!args->no_dependents) {
264 mark_tips(negotiator, args->negotiation_tips);
265 for_each_cached_alternate(negotiator, insert_one_alternate_object);
266 }
267 fetching = 0;
269 for ( ; refs ; refs = refs->next) {
270 struct object_id *remote = &refs->old_oid;
271 const char *remote_hex;
272 struct object *o;
273 /*
275 * If that object is complete (i.e. it is an ancestor of a
276 * local ref), we tell them we have it but do not have to
277 * tell them about its ancestors, which they already know
278 * about.
279 *
280 * We use lookup_object here because we are only
281 * interested in the case we *know* the object is
282 * reachable and we have already scanned it.
283 *
284 * Do this only if args->no_dependents is false (if it is true,
285 * we cannot trust the object flags).
286 */
287 if (!args->no_dependents &&
288 ((o = lookup_object(the_repository, remote->hash)) != NULL) &&
289 (o->flags & COMPLETE)) {
290 continue;
291 }
292 remote_hex = oid_to_hex(remote);
294 if (!fetching) {
295 struct strbuf c = STRBUF_INIT;
296 if (multi_ack == 2) strbuf_addstr(&c, " multi_ack_detailed");
297 if (multi_ack == 1) strbuf_addstr(&c, " multi_ack");
298 if (no_done) strbuf_addstr(&c, " no-done");
299 if (use_sideband == 2) strbuf_addstr(&c, " side-band-64k");
300 if (use_sideband == 1) strbuf_addstr(&c, " side-band");
301 if (args->deepen_relative) strbuf_addstr(&c, " deepen-relative");
302 if (args->use_thin_pack) strbuf_addstr(&c, " thin-pack");
303 if (args->no_progress) strbuf_addstr(&c, " no-progress");
304 if (args->include_tag) strbuf_addstr(&c, " include-tag");
305 if (prefer_ofs_delta) strbuf_addstr(&c, " ofs-delta");
306 if (deepen_since_ok) strbuf_addstr(&c, " deepen-since");
307 if (deepen_not_ok) strbuf_addstr(&c, " deepen-not");
308 if (agent_supported) strbuf_addf(&c, " agent=%s",
309 git_user_agent_sanitized());
310 if (args->filter_options.choice)
311 strbuf_addstr(&c, " filter");
312 packet_buf_write(&req_buf, "want %s%s\n", remote_hex, c.buf);
313 strbuf_release(&c);
314 } else
315 packet_buf_write(&req_buf, "want %s\n", remote_hex);
316 fetching++;
317 }
318 if (!fetching) {
320 strbuf_release(&req_buf);
321 packet_flush(fd[1]);
322 return 1;
323 }
324 if (is_repository_shallow(the_repository))
326 write_shallow_commits(&req_buf, 1, NULL);
327 if (args->depth > 0)
328 packet_buf_write(&req_buf, "deepen %d", args->depth);
329 if (args->deepen_since) {
330 timestamp_t max_age = approxidate(args->deepen_since);
331 packet_buf_write(&req_buf, "deepen-since %"PRItime, max_age);
332 }
333 if (args->deepen_not) {
334 int i;
335 for (i = 0; i < args->deepen_not->nr; i++) {
336 struct string_list_item *s = args->deepen_not->items + i;
337 packet_buf_write(&req_buf, "deepen-not %s", s->string);
338 }
339 }
340 if (server_supports_filtering && args->filter_options.choice)
341 packet_buf_write(&req_buf, "filter %s",
342 args->filter_options.filter_spec);
343 packet_buf_flush(&req_buf);
344 state_len = req_buf.len;
345 if (args->deepen) {
347 const char *arg;
348 struct object_id oid;
349 send_request(args, fd[1], &req_buf);
351 while (packet_reader_read(&reader) == PACKET_READ_NORMAL) {
352 if (skip_prefix(reader.line, "shallow ", &arg)) {
353 if (get_oid_hex(arg, &oid))
354 die(_("invalid shallow line: %s"), reader.line);
355 register_shallow(the_repository, &oid);
356 continue;
357 }
358 if (skip_prefix(reader.line, "unshallow ", &arg)) {
359 if (get_oid_hex(arg, &oid))
360 die(_("invalid unshallow line: %s"), reader.line);
361 if (!lookup_object(the_repository, oid.hash))
362 die(_("object not found: %s"), reader.line);
363 /* make sure that it is parsed as shallow */
364 if (!parse_object(the_repository, &oid))
365 die(_("error in object: %s"), reader.line);
366 if (unregister_shallow(&oid))
367 die(_("no shallow found: %s"), reader.line);
368 continue;
369 }
370 die(_("expected shallow/unshallow, got %s"), reader.line);
371 }
372 } else if (!args->stateless_rpc)
373 send_request(args, fd[1], &req_buf);
374 if (!args->stateless_rpc) {
376 /* If we aren't using the stateless-rpc interface
377 * we don't need to retain the headers.
378 */
379 strbuf_setlen(&req_buf, 0);
380 state_len = 0;
381 }
382 flushes = 0;
384 retval = -1;
385 if (args->no_dependents)
386 goto done;
387 while ((oid = negotiator->next(negotiator))) {
388 packet_buf_write(&req_buf, "have %s\n", oid_to_hex(oid));
389 print_verbose(args, "have %s", oid_to_hex(oid));
390 in_vain++;
391 if (flush_at <= ++count) {
392 int ack;
393 packet_buf_flush(&req_buf);
395 send_request(args, fd[1], &req_buf);
396 strbuf_setlen(&req_buf, state_len);
397 flushes++;
398 flush_at = next_flush(args->stateless_rpc, count);
399 /*
401 * We keep one window "ahead" of the other side, and
402 * will wait for an ACK only on the next one
403 */
404 if (!args->stateless_rpc && count == INITIAL_FLUSH)
405 continue;
406 consume_shallow_list(args, &reader);
408 do {
409 ack = get_ack(&reader, result_oid);
410 if (ack)
411 print_verbose(args, _("got %s %d %s"), "ack",
412 ack, oid_to_hex(result_oid));
413 switch (ack) {
414 case ACK:
415 flushes = 0;
416 multi_ack = 0;
417 retval = 0;
418 goto done;
419 case ACK_common:
420 case ACK_ready:
421 case ACK_continue: {
422 struct commit *commit =
423 lookup_commit(the_repository,
424 result_oid);
425 int was_common;
426 if (!commit)
428 die(_("invalid commit %s"), oid_to_hex(result_oid));
429 was_common = negotiator->ack(negotiator, commit);
430 if (args->stateless_rpc
431 && ack == ACK_common
432 && !was_common) {
433 /* We need to replay the have for this object
434 * on the next RPC request so the peer knows
435 * it is in common with us.
436 */
437 const char *hex = oid_to_hex(result_oid);
438 packet_buf_write(&req_buf, "have %s\n", hex);
439 state_len = req_buf.len;
440 /*
441 * Reset in_vain because an ack
442 * for this commit has not been
443 * seen.
444 */
445 in_vain = 0;
446 } else if (!args->stateless_rpc
447 || ack != ACK_common)
448 in_vain = 0;
449 retval = 0;
450 got_continue = 1;
451 if (ack == ACK_ready)
452 got_ready = 1;
453 break;
454 }
455 }
456 } while (ack);
457 flushes--;
458 if (got_continue && MAX_IN_VAIN < in_vain) {
459 print_verbose(args, _("giving up"));
460 break; /* give up */
461 }
462 if (got_ready)
463 break;
464 }
465 }
466done:
467 if (!got_ready || !no_done) {
468 packet_buf_write(&req_buf, "done\n");
469 send_request(args, fd[1], &req_buf);
470 }
471 print_verbose(args, _("done"));
472 if (retval != 0) {
473 multi_ack = 0;
474 flushes++;
475 }
476 strbuf_release(&req_buf);
477 if (!got_ready || !no_done)
479 consume_shallow_list(args, &reader);
480 while (flushes || multi_ack) {
481 int ack = get_ack(&reader, result_oid);
482 if (ack) {
483 print_verbose(args, _("got %s (%d) %s"), "ack",
484 ack, oid_to_hex(result_oid));
485 if (ack == ACK)
486 return 0;
487 multi_ack = 1;
488 continue;
489 }
490 flushes--;
491 }
492 /* it is no error to fetch into a completely empty repo */
493 return count ? retval : 0;
494}
495static struct commit_list *complete;
497static int mark_complete(const struct object_id *oid)
499{
500 struct object *o = parse_object(the_repository, oid);
501 while (o && o->type == OBJ_TAG) {
503 struct tag *t = (struct tag *) o;
504 if (!t->tagged)
505 break; /* broken repository */
506 o->flags |= COMPLETE;
507 o = parse_object(the_repository, &t->tagged->oid);
508 }
509 if (o && o->type == OBJ_COMMIT) {
510 struct commit *commit = (struct commit *)o;
511 if (!(commit->object.flags & COMPLETE)) {
512 commit->object.flags |= COMPLETE;
513 commit_list_insert(commit, &complete);
514 }
515 }
516 return 0;
517}
518static int mark_complete_oid(const char *refname, const struct object_id *oid,
520 int flag, void *cb_data)
521{
522 return mark_complete(oid);
523}
524static void mark_recent_complete_commits(struct fetch_pack_args *args,
526 timestamp_t cutoff)
527{
528 while (complete && cutoff <= complete->item->date) {
529 print_verbose(args, _("Marking %s as complete"),
530 oid_to_hex(&complete->item->object.oid));
531 pop_most_recent_commit(&complete, COMPLETE);
532 }
533}
534static void add_refs_to_oidset(struct oidset *oids, struct ref *refs)
536{
537 for (; refs; refs = refs->next)
538 oidset_insert(oids, &refs->old_oid);
539}
540static int is_unmatched_ref(const struct ref *ref)
542{
543 struct object_id oid;
544 const char *p;
545 return ref->match_status == REF_NOT_MATCHED &&
546 !parse_oid_hex(ref->name, &oid, &p) &&
547 *p == '\0' &&
548 oideq(&oid, &ref->old_oid);
549}
550static void filter_refs(struct fetch_pack_args *args,
552 struct ref **refs,
553 struct ref **sought, int nr_sought)
554{
555 struct ref *newlist = NULL;
556 struct ref **newtail = &newlist;
557 struct ref *unmatched = NULL;
558 struct ref *ref, *next;
559 struct oidset tip_oids = OIDSET_INIT;
560 int i;
561 int strict = !(allow_unadvertised_object_request &
562 (ALLOW_TIP_SHA1 | ALLOW_REACHABLE_SHA1));
563 i = 0;
565 for (ref = *refs; ref; ref = next) {
566 int keep = 0;
567 next = ref->next;
568 if (starts_with(ref->name, "refs/") &&
570 check_refname_format(ref->name, 0))
571 ; /* trash */
572 else {
573 while (i < nr_sought) {
574 int cmp = strcmp(ref->name, sought[i]->name);
575 if (cmp < 0)
576 break; /* definitely do not have it */
577 else if (cmp == 0) {
578 keep = 1; /* definitely have it */
579 sought[i]->match_status = REF_MATCHED;
580 }
581 i++;
582 }
583 if (!keep && args->fetch_all &&
585 (!args->deepen || !starts_with(ref->name, "refs/tags/")))
586 keep = 1;
587 }
588 if (keep) {
590 *newtail = ref;
591 ref->next = NULL;
592 newtail = &ref->next;
593 } else {
594 ref->next = unmatched;
595 unmatched = ref;
596 }
597 }
598 if (strict) {
600 for (i = 0; i < nr_sought; i++) {
601 ref = sought[i];
602 if (!is_unmatched_ref(ref))
603 continue;
604 add_refs_to_oidset(&tip_oids, unmatched);
606 add_refs_to_oidset(&tip_oids, newlist);
607 break;
608 }
609 }
610 /* Append unmatched requests to the list */
612 for (i = 0; i < nr_sought; i++) {
613 ref = sought[i];
614 if (!is_unmatched_ref(ref))
615 continue;
616 if (!strict || oidset_contains(&tip_oids, &ref->old_oid)) {
618 ref->match_status = REF_MATCHED;
619 *newtail = copy_ref(ref);
620 newtail = &(*newtail)->next;
621 } else {
622 ref->match_status = REF_UNADVERTISED_NOT_ALLOWED;
623 }
624 }
625 oidset_clear(&tip_oids);
627 for (ref = unmatched; ref; ref = next) {
628 next = ref->next;
629 free(ref);
630 }
631 *refs = newlist;
633}
634static void mark_alternate_complete(struct fetch_negotiator *unused,
636 struct object *obj)
637{
638 mark_complete(&obj->oid);
639}
640struct loose_object_iter {
642 struct oidset *loose_object_set;
643 struct ref *refs;
644};
645/*
647 * If the number of refs is not larger than the number of loose objects,
648 * this function stops inserting.
649 */
650static int add_loose_objects_to_set(const struct object_id *oid,
651 const char *path,
652 void *data)
653{
654 struct loose_object_iter *iter = data;
655 oidset_insert(iter->loose_object_set, oid);
656 if (iter->refs == NULL)
657 return 1;
658 iter->refs = iter->refs->next;
660 return 0;
661}
662/*
664 * Mark recent commits available locally and reachable from a local ref as
665 * COMPLETE. If args->no_dependents is false, also mark COMPLETE remote refs as
666 * COMMON_REF (otherwise, we are not planning to participate in negotiation, and
667 * thus do not need COMMON_REF marks).
668 *
669 * The cutoff time for recency is determined by this heuristic: it is the
670 * earliest commit time of the objects in refs that are commits and that we know
671 * the commit time of.
672 */
673static void mark_complete_and_common_ref(struct fetch_negotiator *negotiator,
674 struct fetch_pack_args *args,
675 struct ref **refs)
676{
677 struct ref *ref;
678 int old_save_commit_buffer = save_commit_buffer;
679 timestamp_t cutoff = 0;
680 struct oidset loose_oid_set = OIDSET_INIT;
681 int use_oidset = 0;
682 struct loose_object_iter iter = {&loose_oid_set, *refs};
683 /* Enumerate all loose objects or know refs are not so many. */
685 use_oidset = !for_each_loose_object(add_loose_objects_to_set,
686 &iter, 0);
687 save_commit_buffer = 0;
689 for (ref = *refs; ref; ref = ref->next) {
691 struct object *o;
692 unsigned int flags = OBJECT_INFO_QUICK;
693 if (use_oidset &&
695 !oidset_contains(&loose_oid_set, &ref->old_oid)) {
696 /*
697 * I know this does not exist in the loose form,
698 * so check if it exists in a non-loose form.
699 */
700 flags |= OBJECT_INFO_IGNORE_LOOSE;
701 }
702 if (!has_object_file_with_flags(&ref->old_oid, flags))
704 continue;
705 o = parse_object(the_repository, &ref->old_oid);
706 if (!o)
707 continue;
708 /* We already have it -- which may mean that we were
710 * in sync with the other side at some time after
711 * that (it is OK if we guess wrong here).
712 */
713 if (o->type == OBJ_COMMIT) {
714 struct commit *commit = (struct commit *)o;
715 if (!cutoff || cutoff < commit->date)
716 cutoff = commit->date;
717 }
718 }
719 oidset_clear(&loose_oid_set);
721 if (!args->deepen) {
723 for_each_ref(mark_complete_oid, NULL);
724 for_each_cached_alternate(NULL, mark_alternate_complete);
725 commit_list_sort_by_date(&complete);
726 if (cutoff)
727 mark_recent_complete_commits(args, cutoff);
728 }
729 /*
731 * Mark all complete remote refs as common refs.
732 * Don't mark them common yet; the server has to be told so first.
733 */
734 for (ref = *refs; ref; ref = ref->next) {
735 struct object *o = deref_tag(the_repository,
736 lookup_object(the_repository,
737 ref->old_oid.hash),
738 NULL, 0);
739 if (!o || o->type != OBJ_COMMIT || !(o->flags & COMPLETE))
741 continue;
742 negotiator->known_common(negotiator,
744 (struct commit *)o);
745 }
746 save_commit_buffer = old_save_commit_buffer;
748}
749/*
751 * Returns 1 if every object pointed to by the given remote refs is available
752 * locally and reachable from a local ref, and 0 otherwise.
753 */
754static int everything_local(struct fetch_pack_args *args,
755 struct ref **refs)
756{
757 struct ref *ref;
758 int retval;
759 for (retval = 1, ref = *refs; ref ; ref = ref->next) {
761 const struct object_id *remote = &ref->old_oid;
762 struct object *o;
763 o = lookup_object(the_repository, remote->hash);
765 if (!o || !(o->flags & COMPLETE)) {
766 retval = 0;
767 print_verbose(args, "want %s (%s)", oid_to_hex(remote),
768 ref->name);
769 continue;
770 }
771 print_verbose(args, _("already have %s (%s)"), oid_to_hex(remote),
772 ref->name);
773 }
774 return retval;
776}
777static int sideband_demux(int in, int out, void *data)
779{
780 int *xd = data;
781 int ret;
782 ret = recv_sideband("fetch-pack", xd[0], out);
784 close(out);
785 return ret;
786}
787static int get_pack(struct fetch_pack_args *args,
789 int xd[2], char **pack_lockfile)
790{
791 struct async demux;
792 int do_keep = args->keep_pack;
793 const char *cmd_name;
794 struct pack_header header;
795 int pass_header = 0;
796 struct child_process cmd = CHILD_PROCESS_INIT;
797 int ret;
798 memset(&demux, 0, sizeof(demux));
800 if (use_sideband) {
801 /* xd[] is talking with upload-pack; subprocess reads from
802 * xd[0], spits out band#2 to stderr, and feeds us band#1
803 * through demux->out.
804 */
805 demux.proc = sideband_demux;
806 demux.data = xd;
807 demux.out = -1;
808 demux.isolate_sigpipe = 1;
809 if (start_async(&demux))
810 die(_("fetch-pack: unable to fork off sideband demultiplexer"));
811 }
812 else
813 demux.out = xd[0];
814 if (!args->keep_pack && unpack_limit) {
816 if (read_pack_header(demux.out, &header))
818 die(_("protocol error: bad pack header"));
819 pass_header = 1;
820 if (ntohl(header.hdr_entries) < unpack_limit)
821 do_keep = 0;
822 else
823 do_keep = 1;
824 }
825 if (alternate_shallow_file) {
827 argv_array_push(&cmd.args, "--shallow-file");
828 argv_array_push(&cmd.args, alternate_shallow_file);
829 }
830 if (do_keep || args->from_promisor) {
832 if (pack_lockfile)
833 cmd.out = -1;
834 cmd_name = "index-pack";
835 argv_array_push(&cmd.args, cmd_name);
836 argv_array_push(&cmd.args, "--stdin");
837 if (!args->quiet && !args->no_progress)
838 argv_array_push(&cmd.args, "-v");
839 if (args->use_thin_pack)
840 argv_array_push(&cmd.args, "--fix-thin");
841 if (do_keep && (args->lock_pack || unpack_limit)) {
842 char hostname[HOST_NAME_MAX + 1];
843 if (xgethostname(hostname, sizeof(hostname)))
844 xsnprintf(hostname, sizeof(hostname), "localhost");
845 argv_array_pushf(&cmd.args,
846 "--keep=fetch-pack %"PRIuMAX " on %s",
847 (uintmax_t)getpid(), hostname);
848 }
849 if (args->check_self_contained_and_connected)
850 argv_array_push(&cmd.args, "--check-self-contained-and-connected");
851 if (args->from_promisor)
852 argv_array_push(&cmd.args, "--promisor");
853 }
854 else {
855 cmd_name = "unpack-objects";
856 argv_array_push(&cmd.args, cmd_name);
857 if (args->quiet || args->no_progress)
858 argv_array_push(&cmd.args, "-q");
859 args->check_self_contained_and_connected = 0;
860 }
861 if (pass_header)
863 argv_array_pushf(&cmd.args, "--pack_header=%"PRIu32",%"PRIu32,
864 ntohl(header.hdr_version),
865 ntohl(header.hdr_entries));
866 if (fetch_fsck_objects >= 0
867 ? fetch_fsck_objects
868 : transfer_fsck_objects >= 0
869 ? transfer_fsck_objects
870 : 0) {
871 if (args->from_promisor)
872 /*
873 * We cannot use --strict in index-pack because it
874 * checks both broken objects and links, but we only
875 * want to check for broken objects.
876 */
877 argv_array_push(&cmd.args, "--fsck-objects");
878 else
879 argv_array_pushf(&cmd.args, "--strict%s",
880 fsck_msg_types.buf);
881 }
882 cmd.in = demux.out;
884 cmd.git_cmd = 1;
885 if (start_command(&cmd))
886 die(_("fetch-pack: unable to fork off %s"), cmd_name);
887 if (do_keep && pack_lockfile) {
888 *pack_lockfile = index_pack_lockfile(cmd.out);
889 close(cmd.out);
890 }
891 if (!use_sideband)
893 /* Closed by start_command() */
894 xd[0] = -1;
895 ret = finish_command(&cmd);
897 if (!ret || (args->check_self_contained_and_connected && ret == 1))
898 args->self_contained_and_connected =
899 args->check_self_contained_and_connected &&
900 ret == 0;
901 else
902 die(_("%s failed"), cmd_name);
903 if (use_sideband && finish_async(&demux))
904 die(_("error in sideband demultiplexer"));
905 return 0;
906}
907static int cmp_ref_by_name(const void *a_, const void *b_)
909{
910 const struct ref *a = *((const struct ref **)a_);
911 const struct ref *b = *((const struct ref **)b_);
912 return strcmp(a->name, b->name);
913}
914static struct ref *do_fetch_pack(struct fetch_pack_args *args,
916 int fd[2],
917 const struct ref *orig_ref,
918 struct ref **sought, int nr_sought,
919 struct shallow_info *si,
920 char **pack_lockfile)
921{
922 struct ref *ref = copy_ref_list(orig_ref);
923 struct object_id oid;
924 const char *agent_feature;
925 int agent_len;
926 struct fetch_negotiator negotiator;
927 fetch_negotiator_init(&negotiator, negotiation_algorithm);
928 sort_ref_list(&ref, ref_compare_name);
930 QSORT(sought, nr_sought, cmp_ref_by_name);
931 if ((args->depth > 0 || is_repository_shallow(the_repository)) && !server_supports("shallow"))
933 die(_("Server does not support shallow clients"));
934 if (args->depth > 0 || args->deepen_since || args->deepen_not)
935 args->deepen = 1;
936 if (server_supports("multi_ack_detailed")) {
937 print_verbose(args, _("Server supports multi_ack_detailed"));
938 multi_ack = 2;
939 if (server_supports("no-done")) {
940 print_verbose(args, _("Server supports no-done"));
941 if (args->stateless_rpc)
942 no_done = 1;
943 }
944 }
945 else if (server_supports("multi_ack")) {
946 print_verbose(args, _("Server supports multi_ack"));
947 multi_ack = 1;
948 }
949 if (server_supports("side-band-64k")) {
950 print_verbose(args, _("Server supports side-band-64k"));
951 use_sideband = 2;
952 }
953 else if (server_supports("side-band")) {
954 print_verbose(args, _("Server supports side-band"));
955 use_sideband = 1;
956 }
957 if (server_supports("allow-tip-sha1-in-want")) {
958 print_verbose(args, _("Server supports allow-tip-sha1-in-want"));
959 allow_unadvertised_object_request |= ALLOW_TIP_SHA1;
960 }
961 if (server_supports("allow-reachable-sha1-in-want")) {
962 print_verbose(args, _("Server supports allow-reachable-sha1-in-want"));
963 allow_unadvertised_object_request |= ALLOW_REACHABLE_SHA1;
964 }
965 if (!server_supports("thin-pack"))
966 args->use_thin_pack = 0;
967 if (!server_supports("no-progress"))
968 args->no_progress = 0;
969 if (!server_supports("include-tag"))
970 args->include_tag = 0;
971 if (server_supports("ofs-delta"))
972 print_verbose(args, _("Server supports ofs-delta"));
973 else
974 prefer_ofs_delta = 0;
975 if (server_supports("filter")) {
977 server_supports_filtering = 1;
978 print_verbose(args, _("Server supports filter"));
979 } else if (args->filter_options.choice) {
980 warning("filtering not recognized by server, ignoring");
981 }
982 if ((agent_feature = server_feature_value("agent", &agent_len))) {
984 agent_supported = 1;
985 if (agent_len)
986 print_verbose(args, _("Server version is %.*s"),
987 agent_len, agent_feature);
988 }
989 if (server_supports("deepen-since"))
990 deepen_since_ok = 1;
991 else if (args->deepen_since)
992 die(_("Server does not support --shallow-since"));
993 if (server_supports("deepen-not"))
994 deepen_not_ok = 1;
995 else if (args->deepen_not)
996 die(_("Server does not support --shallow-exclude"));
997 if (!server_supports("deepen-relative") && args->deepen_relative)
998 die(_("Server does not support --deepen"));
999 if (!args->no_dependents) {
1001 mark_complete_and_common_ref(&negotiator, args, &ref);
1002 filter_refs(args, &ref, sought, nr_sought);
1003 if (everything_local(args, &ref)) {
1004 packet_flush(fd[1]);
1005 goto all_done;
1006 }
1007 } else {
1008 filter_refs(args, &ref, sought, nr_sought);
1009 }
1010 if (find_common(&negotiator, args, fd, &oid, ref) < 0)
1011 if (!args->keep_pack)
1012 /* When cloning, it is not unusual to have
1013 * no common commit.
1014 */
1015 warning(_("no common commits"));
1016 if (args->stateless_rpc)
1018 packet_flush(fd[1]);
1019 if (args->deepen)
1020 setup_alternate_shallow(&shallow_lock, &alternate_shallow_file,
1021 NULL);
1022 else if (si->nr_ours || si->nr_theirs)
1023 alternate_shallow_file = setup_temporary_shallow(si->shallow);
1024 else
1025 alternate_shallow_file = NULL;
1026 if (get_pack(args, fd, pack_lockfile))
1027 die(_("git fetch-pack: fetch failed."));
1028 all_done:
1030 negotiator.release(&negotiator);
1031 return ref;
1032}
1033static void add_shallow_requests(struct strbuf *req_buf,
1035 const struct fetch_pack_args *args)
1036{
1037 if (is_repository_shallow(the_repository))
1038 write_shallow_commits(req_buf, 1, NULL);
1039 if (args->depth > 0)
1040 packet_buf_write(req_buf, "deepen %d", args->depth);
1041 if (args->deepen_since) {
1042 timestamp_t max_age = approxidate(args->deepen_since);
1043 packet_buf_write(req_buf, "deepen-since %"PRItime, max_age);
1044 }
1045 if (args->deepen_not) {
1046 int i;
1047 for (i = 0; i < args->deepen_not->nr; i++) {
1048 struct string_list_item *s = args->deepen_not->items + i;
1049 packet_buf_write(req_buf, "deepen-not %s", s->string);
1050 }
1051 }
1052}
1053static void add_wants(int no_dependents, const struct ref *wants, struct strbuf *req_buf)
1055{
1056 int use_ref_in_want = server_supports_feature("fetch", "ref-in-want", 0);
1057 for ( ; wants ; wants = wants->next) {
1059 const struct object_id *remote = &wants->old_oid;
1060 struct object *o;
1061 /*
1063 * If that object is complete (i.e. it is an ancestor of a
1064 * local ref), we tell them we have it but do not have to
1065 * tell them about its ancestors, which they already know
1066 * about.
1067 *
1068 * We use lookup_object here because we are only
1069 * interested in the case we *know* the object is
1070 * reachable and we have already scanned it.
1071 *
1072 * Do this only if args->no_dependents is false (if it is true,
1073 * we cannot trust the object flags).
1074 */
1075 if (!no_dependents &&
1076 ((o = lookup_object(the_repository, remote->hash)) != NULL) &&
1077 (o->flags & COMPLETE)) {
1078 continue;
1079 }
1080 if (!use_ref_in_want || wants->exact_oid)
1082 packet_buf_write(req_buf, "want %s\n", oid_to_hex(remote));
1083 else
1084 packet_buf_write(req_buf, "want-ref %s\n", wants->name);
1085 }
1086}
1087static void add_common(struct strbuf *req_buf, struct oidset *common)
1089{
1090 struct oidset_iter iter;
1091 const struct object_id *oid;
1092 oidset_iter_init(common, &iter);
1093 while ((oid = oidset_iter_next(&iter))) {
1095 packet_buf_write(req_buf, "have %s\n", oid_to_hex(oid));
1096 }
1097}
1098static int add_haves(struct fetch_negotiator *negotiator,
1100 struct strbuf *req_buf,
1101 int *haves_to_send, int *in_vain)
1102{
1103 int ret = 0;
1104 int haves_added = 0;
1105 const struct object_id *oid;
1106 while ((oid = negotiator->next(negotiator))) {
1108 packet_buf_write(req_buf, "have %s\n", oid_to_hex(oid));
1109 if (++haves_added >= *haves_to_send)
1110 break;
1111 }
1112 *in_vain += haves_added;
1114 if (!haves_added || *in_vain >= MAX_IN_VAIN) {
1115 /* Send Done */
1116 packet_buf_write(req_buf, "done\n");
1117 ret = 1;
1118 }
1119 /* Increase haves to send on next round */
1121 *haves_to_send = next_flush(1, *haves_to_send);
1122 return ret;
1124}
1125static int send_fetch_request(struct fetch_negotiator *negotiator, int fd_out,
1127 const struct fetch_pack_args *args,
1128 const struct ref *wants, struct oidset *common,
1129 int *haves_to_send, int *in_vain)
1130{
1131 int ret = 0;
1132 struct strbuf req_buf = STRBUF_INIT;
1133 if (server_supports_v2("fetch", 1))
1135 packet_buf_write(&req_buf, "command=fetch");
1136 if (server_supports_v2("agent", 0))
1137 packet_buf_write(&req_buf, "agent=%s", git_user_agent_sanitized());
1138 if (args->server_options && args->server_options->nr &&
1139 server_supports_v2("server-option", 1)) {
1140 int i;
1141 for (i = 0; i < args->server_options->nr; i++)
1142 packet_write_fmt(fd_out, "server-option=%s",
1143 args->server_options->items[i].string);
1144 }
1145 packet_buf_delim(&req_buf);
1147 if (args->use_thin_pack)
1148 packet_buf_write(&req_buf, "thin-pack");
1149 if (args->no_progress)
1150 packet_buf_write(&req_buf, "no-progress");
1151 if (args->include_tag)
1152 packet_buf_write(&req_buf, "include-tag");
1153 if (prefer_ofs_delta)
1154 packet_buf_write(&req_buf, "ofs-delta");
1155 /* Add shallow-info and deepen request */
1157 if (server_supports_feature("fetch", "shallow", 0))
1158 add_shallow_requests(&req_buf, args);
1159 else if (is_repository_shallow(the_repository) || args->deepen)
1160 die(_("Server does not support shallow requests"));
1161 /* Add filter */
1163 if (server_supports_feature("fetch", "filter", 0) &&
1164 args->filter_options.choice) {
1165 print_verbose(args, _("Server supports filter"));
1166 packet_buf_write(&req_buf, "filter %s",
1167 args->filter_options.filter_spec);
1168 } else if (args->filter_options.choice) {
1169 warning("filtering not recognized by server, ignoring");
1170 }
1171 /* add wants */
1173 add_wants(args->no_dependents, wants, &req_buf);
1174 if (args->no_dependents) {
1176 packet_buf_write(&req_buf, "done");
1177 ret = 1;
1178 } else {
1179 /* Add all of the common commits we've found in previous rounds */
1180 add_common(&req_buf, common);
1181 /* Add initial haves */
1183 ret = add_haves(negotiator, &req_buf, haves_to_send, in_vain);
1184 }
1185 /* Send request */
1187 packet_buf_flush(&req_buf);
1188 write_or_die(fd_out, req_buf.buf, req_buf.len);
1189 strbuf_release(&req_buf);
1191 return ret;
1192}
1193/*
1195 * Processes a section header in a server's response and checks if it matches
1196 * `section`. If the value of `peek` is 1, the header line will be peeked (and
1197 * not consumed); if 0, the line will be consumed and the function will die if
1198 * the section header doesn't match what was expected.
1199 */
1200static int process_section_header(struct packet_reader *reader,
1201 const char *section, int peek)
1202{
1203 int ret;
1204 if (packet_reader_peek(reader) != PACKET_READ_NORMAL)
1206 die(_("error reading section header '%s'"), section);
1207 ret = !strcmp(reader->line, section);
1209 if (!peek) {
1211 if (!ret)
1212 die(_("expected '%s', received '%s'"),
1213 section, reader->line);
1214 packet_reader_read(reader);
1215 }
1216 return ret;
1218}
1219static int process_acks(struct fetch_negotiator *negotiator,
1221 struct packet_reader *reader,
1222 struct oidset *common)
1223{
1224 /* received */
1225 int received_ready = 0;
1226 int received_ack = 0;
1227 process_section_header(reader, "acknowledgments", 0);
1229 while (packet_reader_read(reader) == PACKET_READ_NORMAL) {
1230 const char *arg;
1231 if (!strcmp(reader->line, "NAK"))
1233 continue;
1234 if (skip_prefix(reader->line, "ACK ", &arg)) {
1236 struct object_id oid;
1237 if (!get_oid_hex(arg, &oid)) {
1238 struct commit *commit;
1239 oidset_insert(common, &oid);
1240 commit = lookup_commit(the_repository, &oid);
1241 negotiator->ack(negotiator, commit);
1242 }
1243 continue;
1244 }
1245 if (!strcmp(reader->line, "ready")) {
1247 received_ready = 1;
1248 continue;
1249 }
1250 die(_("unexpected acknowledgment line: '%s'"), reader->line);
1252 }
1253 if (reader->status != PACKET_READ_FLUSH &&
1255 reader->status != PACKET_READ_DELIM)
1256 die(_("error processing acks: %d"), reader->status);
1257 /*
1259 * If an "acknowledgments" section is sent, a packfile is sent if and
1260 * only if "ready" was sent in this section. The other sections
1261 * ("shallow-info" and "wanted-refs") are sent only if a packfile is
1262 * sent. Therefore, a DELIM is expected if "ready" is sent, and a FLUSH
1263 * otherwise.
1264 */
1265 if (received_ready && reader->status != PACKET_READ_DELIM)
1266 die(_("expected packfile to be sent after 'ready'"));
1267 if (!received_ready && reader->status != PACKET_READ_FLUSH)
1268 die(_("expected no other sections to be sent after no 'ready'"));
1269 /* return 0 if no common, 1 if there are common, or 2 if ready */
1271 return received_ready ? 2 : (received_ack ? 1 : 0);
1272}
1273static void receive_shallow_info(struct fetch_pack_args *args,
1275 struct packet_reader *reader)
1276{
1277 process_section_header(reader, "shallow-info", 0);
1278 while (packet_reader_read(reader) == PACKET_READ_NORMAL) {
1279 const char *arg;
1280 struct object_id oid;
1281 if (skip_prefix(reader->line, "shallow ", &arg)) {
1283 if (get_oid_hex(arg, &oid))
1284 die(_("invalid shallow line: %s"), reader->line);
1285 register_shallow(the_repository, &oid);
1286 continue;
1287 }
1288 if (skip_prefix(reader->line, "unshallow ", &arg)) {
1289 if (get_oid_hex(arg, &oid))
1290 die(_("invalid unshallow line: %s"), reader->line);
1291 if (!lookup_object(the_repository, oid.hash))
1292 die(_("object not found: %s"), reader->line);
1293 /* make sure that it is parsed as shallow */
1294 if (!parse_object(the_repository, &oid))
1295 die(_("error in object: %s"), reader->line);
1296 if (unregister_shallow(&oid))
1297 die(_("no shallow found: %s"), reader->line);
1298 continue;
1299 }
1300 die(_("expected shallow/unshallow, got %s"), reader->line);
1301 }
1302 if (reader->status != PACKET_READ_FLUSH &&
1304 reader->status != PACKET_READ_DELIM)
1305 die(_("error processing shallow info: %d"), reader->status);
1306 setup_alternate_shallow(&shallow_lock, &alternate_shallow_file, NULL);
1308 args->deepen = 1;
1309}
1310static void receive_wanted_refs(struct packet_reader *reader,
1312 struct ref **sought, int nr_sought)
1313{
1314 process_section_header(reader, "wanted-refs", 0);
1315 while (packet_reader_read(reader) == PACKET_READ_NORMAL) {
1316 struct object_id oid;
1317 const char *end;
1318 int i;
1319 if (parse_oid_hex(reader->line, &oid, &end) || *end++ != ' ')
1321 die(_("expected wanted-ref, got '%s'"), reader->line);
1322 for (i = 0; i < nr_sought; i++) {
1324 if (!strcmp(end, sought[i]->name)) {
1325 oidcpy(&sought[i]->old_oid, &oid);
1326 break;
1327 }
1328 }
1329 if (i == nr_sought)
1331 die(_("unexpected wanted-ref: '%s'"), reader->line);
1332 }
1333 if (reader->status != PACKET_READ_DELIM)
1335 die(_("error processing wanted refs: %d"), reader->status);
1336}
1337enum fetch_state {
1339 FETCH_CHECK_LOCAL = 0,
1340 FETCH_SEND_REQUEST,
1341 FETCH_PROCESS_ACKS,
1342 FETCH_GET_PACK,
1343 FETCH_DONE,
1344};
1345static struct ref *do_fetch_pack_v2(struct fetch_pack_args *args,
1347 int fd[2],
1348 const struct ref *orig_ref,
1349 struct ref **sought, int nr_sought,
1350 char **pack_lockfile)
1351{
1352 struct ref *ref = copy_ref_list(orig_ref);
1353 enum fetch_state state = FETCH_CHECK_LOCAL;
1354 struct oidset common = OIDSET_INIT;
1355 struct packet_reader reader;
1356 int in_vain = 0;
1357 int haves_to_send = INITIAL_FLUSH;
1358 struct fetch_negotiator negotiator;
1359 fetch_negotiator_init(&negotiator, negotiation_algorithm);
1360 packet_reader_init(&reader, fd[0], NULL, 0,
1361 PACKET_READ_CHOMP_NEWLINE);
1362 while (state != FETCH_DONE) {
1364 switch (state) {
1365 case FETCH_CHECK_LOCAL:
1366 sort_ref_list(&ref, ref_compare_name);
1367 QSORT(sought, nr_sought, cmp_ref_by_name);
1368 /* v2 supports these by default */
1370 allow_unadvertised_object_request |= ALLOW_REACHABLE_SHA1;
1371 use_sideband = 2;
1372 if (args->depth > 0 || args->deepen_since || args->deepen_not)
1373 args->deepen = 1;
1374 /* Filter 'ref' by 'sought' and those that aren't local */
1376 if (!args->no_dependents) {
1377 mark_complete_and_common_ref(&negotiator, args, &ref);
1378 filter_refs(args, &ref, sought, nr_sought);
1379 if (everything_local(args, &ref))
1380 state = FETCH_DONE;
1381 else
1382 state = FETCH_SEND_REQUEST;
1383 mark_tips(&negotiator, args->negotiation_tips);
1385 for_each_cached_alternate(&negotiator,
1386 insert_one_alternate_object);
1387 } else {
1388 filter_refs(args, &ref, sought, nr_sought);
1389 state = FETCH_SEND_REQUEST;
1390 }
1391 break;
1392 case FETCH_SEND_REQUEST:
1393 if (send_fetch_request(&negotiator, fd[1], args, ref,
1394 &common,
1395 &haves_to_send, &in_vain))
1396 state = FETCH_GET_PACK;
1397 else
1398 state = FETCH_PROCESS_ACKS;
1399 break;
1400 case FETCH_PROCESS_ACKS:
1401 /* Process ACKs/NAKs */
1402 switch (process_acks(&negotiator, &reader, &common)) {
1403 case 2:
1404 state = FETCH_GET_PACK;
1405 break;
1406 case 1:
1407 in_vain = 0;
1408 /* fallthrough */
1409 default:
1410 state = FETCH_SEND_REQUEST;
1411 break;
1412 }
1413 break;
1414 case FETCH_GET_PACK:
1415 /* Check for shallow-info section */
1416 if (process_section_header(&reader, "shallow-info", 1))
1417 receive_shallow_info(args, &reader);
1418 if (process_section_header(&reader, "wanted-refs", 1))
1420 receive_wanted_refs(&reader, sought, nr_sought);
1421 /* get the pack */
1423 process_section_header(&reader, "packfile", 0);
1424 if (get_pack(args, fd, pack_lockfile))
1425 die(_("git fetch-pack: fetch failed."));
1426 state = FETCH_DONE;
1428 break;
1429 case FETCH_DONE:
1430 continue;
1431 }
1432 }
1433 negotiator.release(&negotiator);
1435 oidset_clear(&common);
1436 return ref;
1437}
1438static int fetch_pack_config_cb(const char *var, const char *value, void *cb)
1440{
1441 if (strcmp(var, "fetch.fsck.skiplist") == 0) {
1442 const char *path;
1443 if (git_config_pathname(&path, var, value))
1445 return 1;
1446 strbuf_addf(&fsck_msg_types, "%cskiplist=%s",
1447 fsck_msg_types.len ? ',' : '=', path);
1448 free((char *)path);
1449 return 0;
1450 }
1451 if (skip_prefix(var, "fetch.fsck.", &var)) {
1453 if (is_valid_msg_type(var, value))
1454 strbuf_addf(&fsck_msg_types, "%c%s=%s",
1455 fsck_msg_types.len ? ',' : '=', var, value);
1456 else
1457 warning("Skipping unknown msg id '%s'", var);
1458 return 0;
1459 }
1460 return git_default_config(var, value, cb);
1462}
1463static void fetch_pack_config(void)
1465{
1466 git_config_get_int("fetch.unpacklimit", &fetch_unpack_limit);
1467 git_config_get_int("transfer.unpacklimit", &transfer_unpack_limit);
1468 git_config_get_bool("repack.usedeltabaseoffset", &prefer_ofs_delta);
1469 git_config_get_bool("fetch.fsckobjects", &fetch_fsck_objects);
1470 git_config_get_bool("transfer.fsckobjects", &transfer_fsck_objects);
1471 git_config_get_string("fetch.negotiationalgorithm",
1472 &negotiation_algorithm);
1473 git_config(fetch_pack_config_cb, NULL);
1475}
1476static void fetch_pack_setup(void)
1478{
1479 static int did_setup;
1480 if (did_setup)
1481 return;
1482 fetch_pack_config();
1483 if (0 <= transfer_unpack_limit)
1484 unpack_limit = transfer_unpack_limit;
1485 else if (0 <= fetch_unpack_limit)
1486 unpack_limit = fetch_unpack_limit;
1487 did_setup = 1;
1488}
1489static int remove_duplicates_in_refs(struct ref **ref, int nr)
1491{
1492 struct string_list names = STRING_LIST_INIT_NODUP;
1493 int src, dst;
1494 for (src = dst = 0; src < nr; src++) {
1496 struct string_list_item *item;
1497 item = string_list_insert(&names, ref[src]->name);
1498 if (item->util)
1499 continue; /* already have it */
1500 item->util = ref[src];
1501 if (src != dst)
1502 ref[dst] = ref[src];
1503 dst++;
1504 }
1505 for (src = dst; src < nr; src++)
1506 ref[src] = NULL;
1507 string_list_clear(&names, 0);
1508 return dst;
1509}
1510static void update_shallow(struct fetch_pack_args *args,
1512 struct ref **sought, int nr_sought,
1513 struct shallow_info *si)
1514{
1515 struct oid_array ref = OID_ARRAY_INIT;
1516 int *status;
1517 int i;
1518 if (args->deepen && alternate_shallow_file) {
1520 if (*alternate_shallow_file == '\0') { /* --unshallow */
1521 unlink_or_warn(git_path_shallow(the_repository));
1522 rollback_lock_file(&shallow_lock);
1523 } else
1524 commit_lock_file(&shallow_lock);
1525 return;
1526 }
1527 if (!si->shallow || !si->shallow->nr)
1529 return;
1530 if (args->cloning) {
1532 /*
1533 * remote is shallow, but this is a clone, there are
1534 * no objects in repo to worry about. Accept any
1535 * shallow points that exist in the pack (iow in repo
1536 * after get_pack() and reprepare_packed_git())
1537 */
1538 struct oid_array extra = OID_ARRAY_INIT;
1539 struct object_id *oid = si->shallow->oid;
1540 for (i = 0; i < si->shallow->nr; i++)
1541 if (has_object_file(&oid[i]))
1542 oid_array_append(&extra, &oid[i]);
1543 if (extra.nr) {
1544 setup_alternate_shallow(&shallow_lock,
1545 &alternate_shallow_file,
1546 &extra);
1547 commit_lock_file(&shallow_lock);
1548 }
1549 oid_array_clear(&extra);
1550 return;
1551 }
1552 if (!si->nr_ours && !si->nr_theirs)
1554 return;
1555 remove_nonexistent_theirs_shallow(si);
1557 if (!si->nr_ours && !si->nr_theirs)
1558 return;
1559 for (i = 0; i < nr_sought; i++)
1560 oid_array_append(&ref, &sought[i]->old_oid);
1561 si->ref = &ref;
1562 if (args->update_shallow) {
1564 /*
1565 * remote is also shallow, .git/shallow may be updated
1566 * so all refs can be accepted. Make sure we only add
1567 * shallow roots that are actually reachable from new
1568 * refs.
1569 */
1570 struct oid_array extra = OID_ARRAY_INIT;
1571 struct object_id *oid = si->shallow->oid;
1572 assign_shallow_commits_to_refs(si, NULL, NULL);
1573 if (!si->nr_ours && !si->nr_theirs) {
1574 oid_array_clear(&ref);
1575 return;
1576 }
1577 for (i = 0; i < si->nr_ours; i++)
1578 oid_array_append(&extra, &oid[si->ours[i]]);
1579 for (i = 0; i < si->nr_theirs; i++)
1580 oid_array_append(&extra, &oid[si->theirs[i]]);
1581 setup_alternate_shallow(&shallow_lock,
1582 &alternate_shallow_file,
1583 &extra);
1584 commit_lock_file(&shallow_lock);
1585 oid_array_clear(&extra);
1586 oid_array_clear(&ref);
1587 return;
1588 }
1589 /*
1591 * remote is also shallow, check what ref is safe to update
1592 * without updating .git/shallow
1593 */
1594 status = xcalloc(nr_sought, sizeof(*status));
1595 assign_shallow_commits_to_refs(si, NULL, status);
1596 if (si->nr_ours || si->nr_theirs) {
1597 for (i = 0; i < nr_sought; i++)
1598 if (status[i])
1599 sought[i]->status = REF_STATUS_REJECT_SHALLOW;
1600 }
1601 free(status);
1602 oid_array_clear(&ref);
1603}
1604static int iterate_ref_map(void *cb_data, struct object_id *oid)
1606{
1607 struct ref **rm = cb_data;
1608 struct ref *ref = *rm;
1609 if (!ref)
1611 return -1; /* end of the list */
1612 *rm = ref->next;
1613 oidcpy(oid, &ref->old_oid);
1614 return 0;
1615}
1616struct ref *fetch_pack(struct fetch_pack_args *args,
1618 int fd[], struct child_process *conn,
1619 const struct ref *ref,
1620 const char *dest,
1621 struct ref **sought, int nr_sought,
1622 struct oid_array *shallow,
1623 char **pack_lockfile,
1624 enum protocol_version version)
1625{
1626 struct ref *ref_cpy;
1627 struct shallow_info si;
1628 fetch_pack_setup();
1630 if (nr_sought)
1631 nr_sought = remove_duplicates_in_refs(sought, nr_sought);
1632 if (args->no_dependents && !args->filter_options.choice) {
1634 /*
1635 * The protocol does not support requesting that only the
1636 * wanted objects be sent, so approximate this by setting a
1637 * "blob:none" filter if no filter is already set. This works
1638 * for all object types: note that wanted blobs will still be
1639 * sent because they are directly specified as a "want".
1640 *
1641 * NEEDSWORK: Add an option in the protocol to request that
1642 * only the wanted objects be sent, and implement it.
1643 */
1644 parse_list_objects_filter(&args->filter_options, "blob:none");
1645 }
1646 if (version != protocol_v2 && !ref) {
1648 packet_flush(fd[1]);
1649 die(_("no matching remote head"));
1650 }
1651 prepare_shallow_info(&si, shallow);
1652 if (version == protocol_v2)
1653 ref_cpy = do_fetch_pack_v2(args, fd, ref, sought, nr_sought,
1654 pack_lockfile);
1655 else
1656 ref_cpy = do_fetch_pack(args, fd, ref, sought, nr_sought,
1657 &si, pack_lockfile);
1658 reprepare_packed_git(the_repository);
1659 if (!args->cloning && args->deepen) {
1661 struct check_connected_options opt = CHECK_CONNECTED_INIT;
1662 struct ref *iterator = ref_cpy;
1663 opt.shallow_file = alternate_shallow_file;
1664 if (args->deepen)
1665 opt.is_deepening_fetch = 1;
1666 if (check_connected(iterate_ref_map, &iterator, &opt)) {
1667 error(_("remote did not send all necessary objects"));
1668 free_refs(ref_cpy);
1669 ref_cpy = NULL;
1670 rollback_lock_file(&shallow_lock);
1671 goto cleanup;
1672 }
1673 args->connectivity_checked = 1;
1674 }
1675 update_shallow(args, sought, nr_sought, &si);
1677cleanup:
1678 clear_shallow_info(&si);
1679 return ref_cpy;
1680}
1681int report_unmatched_refs(struct ref **sought, int nr_sought)
1683{
1684 int i, ret = 0;
1685 for (i = 0; i < nr_sought; i++) {
1687 if (!sought[i])
1688 continue;
1689 switch (sought[i]->match_status) {
1690 case REF_MATCHED:
1691 continue;
1692 case REF_NOT_MATCHED:
1693 error(_("no such remote ref %s"), sought[i]->name);
1694 break;
1695 case REF_UNADVERTISED_NOT_ALLOWED:
1696 error(_("Server does not allow request for unadvertised object %s"),
1697 sought[i]->name);
1698 break;
1699 }
1700 ret = 1;
1701 }
1702 return ret;
1703}