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