parse-options: fix clang opterror() -Wunused-value warning
[git/git.git] / fetch-pack.c
CommitLineData
745f7a8c
NTND
1#include "cache.h"
2#include "refs.h"
3#include "pkt-line.h"
4#include "commit.h"
5#include "tag.h"
6#include "exec_cmd.h"
7#include "pack.h"
8#include "sideband.h"
9#include "fetch-pack.h"
10#include "remote.h"
11#include "run-command.h"
12#include "transport.h"
13#include "version.h"
14
15static int transfer_unpack_limit = -1;
16static int fetch_unpack_limit = -1;
17static int unpack_limit = 100;
18static int prefer_ofs_delta = 1;
19static int no_done;
20static int fetch_fsck_objects = -1;
21static int transfer_fsck_objects = -1;
22static int agent_supported;
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NTND
23static struct lock_file shallow_lock;
24static const char *alternate_shallow_file;
745f7a8c
NTND
25
26#define COMPLETE (1U << 0)
27#define COMMON (1U << 1)
28#define COMMON_REF (1U << 2)
29#define SEEN (1U << 3)
30#define POPPED (1U << 4)
31
32static int marked;
33
34/*
35 * After sending this many "have"s if we do not get any new ACK , we
36 * give up traversing our history.
37 */
38#define MAX_IN_VAIN 256
39
40static struct commit_list *rev_list;
6e7b66ee 41static int non_common_revs, multi_ack, use_sideband, allow_tip_sha1_in_want;
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NTND
42
43static void rev_list_push(struct commit *commit, int mark)
44{
45 if (!(commit->object.flags & mark)) {
46 commit->object.flags |= mark;
47
48 if (!(commit->object.parsed))
49 if (parse_commit(commit))
50 return;
51
52 commit_list_insert_by_date(commit, &rev_list);
53
54 if (!(commit->object.flags & COMMON))
55 non_common_revs++;
56 }
57}
58
59static int rev_list_insert_ref(const char *refname, const unsigned char *sha1, int flag, void *cb_data)
60{
61 struct object *o = deref_tag(parse_object(sha1), refname, 0);
62
63 if (o && o->type == OBJ_COMMIT)
64 rev_list_push((struct commit *)o, SEEN);
65
66 return 0;
67}
68
69static int clear_marks(const char *refname, const unsigned char *sha1, int flag, void *cb_data)
70{
71 struct object *o = deref_tag(parse_object(sha1), refname, 0);
72
73 if (o && o->type == OBJ_COMMIT)
74 clear_commit_marks((struct commit *)o,
75 COMMON | COMMON_REF | SEEN | POPPED);
76 return 0;
77}
78
79/*
80 This function marks a rev and its ancestors as common.
81 In some cases, it is desirable to mark only the ancestors (for example
82 when only the server does not yet know that they are common).
83*/
84
85static void mark_common(struct commit *commit,
86 int ancestors_only, int dont_parse)
87{
88 if (commit != NULL && !(commit->object.flags & COMMON)) {
89 struct object *o = (struct object *)commit;
90
91 if (!ancestors_only)
92 o->flags |= COMMON;
93
94 if (!(o->flags & SEEN))
95 rev_list_push(commit, SEEN);
96 else {
97 struct commit_list *parents;
98
99 if (!ancestors_only && !(o->flags & POPPED))
100 non_common_revs--;
101 if (!o->parsed && !dont_parse)
102 if (parse_commit(commit))
103 return;
104
105 for (parents = commit->parents;
106 parents;
107 parents = parents->next)
108 mark_common(parents->item, 0, dont_parse);
109 }
110 }
111}
112
113/*
114 Get the next rev to send, ignoring the common.
115*/
116
117static const unsigned char *get_rev(void)
118{
119 struct commit *commit = NULL;
120
121 while (commit == NULL) {
122 unsigned int mark;
123 struct commit_list *parents;
124
125 if (rev_list == NULL || non_common_revs == 0)
126 return NULL;
127
128 commit = rev_list->item;
129 if (!commit->object.parsed)
130 parse_commit(commit);
131 parents = commit->parents;
132
133 commit->object.flags |= POPPED;
134 if (!(commit->object.flags & COMMON))
135 non_common_revs--;
136
137 if (commit->object.flags & COMMON) {
138 /* do not send "have", and ignore ancestors */
139 commit = NULL;
140 mark = COMMON | SEEN;
141 } else if (commit->object.flags & COMMON_REF)
142 /* send "have", and ignore ancestors */
143 mark = COMMON | SEEN;
144 else
145 /* send "have", also for its ancestors */
146 mark = SEEN;
147
148 while (parents) {
149 if (!(parents->item->object.flags & SEEN))
150 rev_list_push(parents->item, mark);
151 if (mark & COMMON)
152 mark_common(parents->item, 1, 0);
153 parents = parents->next;
154 }
155
156 rev_list = rev_list->next;
157 }
158
159 return commit->object.sha1;
160}
161
162enum ack_type {
163 NAK = 0,
164 ACK,
165 ACK_continue,
166 ACK_common,
167 ACK_ready
168};
169
170static void consume_shallow_list(struct fetch_pack_args *args, int fd)
171{
172 if (args->stateless_rpc && args->depth > 0) {
173 /* If we sent a depth we will get back "duplicate"
174 * shallow and unshallow commands every time there
175 * is a block of have lines exchanged.
176 */
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JK
177 char *line;
178 while ((line = packet_read_line(fd, NULL))) {
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NTND
179 if (!prefixcmp(line, "shallow "))
180 continue;
181 if (!prefixcmp(line, "unshallow "))
182 continue;
183 die("git fetch-pack: expected shallow list");
184 }
185 }
186}
187
188struct write_shallow_data {
189 struct strbuf *out;
190 int use_pack_protocol;
191 int count;
192};
193
194static int write_one_shallow(const struct commit_graft *graft, void *cb_data)
195{
196 struct write_shallow_data *data = cb_data;
197 const char *hex = sha1_to_hex(graft->sha1);
198 data->count++;
199 if (data->use_pack_protocol)
200 packet_buf_write(data->out, "shallow %s", hex);
201 else {
202 strbuf_addstr(data->out, hex);
203 strbuf_addch(data->out, '\n');
204 }
205 return 0;
206}
207
208static int write_shallow_commits(struct strbuf *out, int use_pack_protocol)
209{
210 struct write_shallow_data data;
211 data.out = out;
212 data.use_pack_protocol = use_pack_protocol;
213 data.count = 0;
214 for_each_commit_graft(write_one_shallow, &data);
215 return data.count;
216}
217
218static enum ack_type get_ack(int fd, unsigned char *result_sha1)
219{
74543a04
JK
220 int len;
221 char *line = packet_read_line(fd, &len);
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NTND
222
223 if (!len)
224 die("git fetch-pack: expected ACK/NAK, got EOF");
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NTND
225 if (!strcmp(line, "NAK"))
226 return NAK;
227 if (!prefixcmp(line, "ACK ")) {
228 if (!get_sha1_hex(line+4, result_sha1)) {
030e9dd6
JK
229 if (len < 45)
230 return ACK;
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231 if (strstr(line+45, "continue"))
232 return ACK_continue;
233 if (strstr(line+45, "common"))
234 return ACK_common;
235 if (strstr(line+45, "ready"))
236 return ACK_ready;
237 return ACK;
238 }
239 }
240 die("git fetch_pack: expected ACK/NAK, got '%s'", line);
241}
242
243static void send_request(struct fetch_pack_args *args,
244 int fd, struct strbuf *buf)
245{
246 if (args->stateless_rpc) {
247 send_sideband(fd, -1, buf->buf, buf->len, LARGE_PACKET_MAX);
248 packet_flush(fd);
249 } else
cdf4fb8e 250 write_or_die(fd, buf->buf, buf->len);
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NTND
251}
252
253static void insert_one_alternate_ref(const struct ref *ref, void *unused)
254{
255 rev_list_insert_ref(NULL, ref->old_sha1, 0, NULL);
256}
257
258#define INITIAL_FLUSH 16
259#define PIPESAFE_FLUSH 32
260#define LARGE_FLUSH 1024
261
262static int next_flush(struct fetch_pack_args *args, int count)
263{
264 int flush_limit = args->stateless_rpc ? LARGE_FLUSH : PIPESAFE_FLUSH;
265
266 if (count < flush_limit)
267 count <<= 1;
268 else
269 count += flush_limit;
270 return count;
271}
272
273static int find_common(struct fetch_pack_args *args,
274 int fd[2], unsigned char *result_sha1,
275 struct ref *refs)
276{
277 int fetching;
278 int count = 0, flushes = 0, flush_at = INITIAL_FLUSH, retval;
279 const unsigned char *sha1;
280 unsigned in_vain = 0;
281 int got_continue = 0;
282 int got_ready = 0;
283 struct strbuf req_buf = STRBUF_INIT;
284 size_t state_len = 0;
285
286 if (args->stateless_rpc && multi_ack == 1)
287 die("--stateless-rpc requires multi_ack_detailed");
288 if (marked)
289 for_each_ref(clear_marks, NULL);
290 marked = 1;
291
292 for_each_ref(rev_list_insert_ref, NULL);
293 for_each_alternate_ref(insert_one_alternate_ref, NULL);
294
295 fetching = 0;
296 for ( ; refs ; refs = refs->next) {
297 unsigned char *remote = refs->old_sha1;
298 const char *remote_hex;
299 struct object *o;
300
301 /*
302 * If that object is complete (i.e. it is an ancestor of a
303 * local ref), we tell them we have it but do not have to
304 * tell them about its ancestors, which they already know
305 * about.
306 *
307 * We use lookup_object here because we are only
308 * interested in the case we *know* the object is
309 * reachable and we have already scanned it.
310 */
311 if (((o = lookup_object(remote)) != NULL) &&
312 (o->flags & COMPLETE)) {
313 continue;
314 }
315
316 remote_hex = sha1_to_hex(remote);
317 if (!fetching) {
318 struct strbuf c = STRBUF_INIT;
319 if (multi_ack == 2) strbuf_addstr(&c, " multi_ack_detailed");
320 if (multi_ack == 1) strbuf_addstr(&c, " multi_ack");
321 if (no_done) strbuf_addstr(&c, " no-done");
322 if (use_sideband == 2) strbuf_addstr(&c, " side-band-64k");
323 if (use_sideband == 1) strbuf_addstr(&c, " side-band");
324 if (args->use_thin_pack) strbuf_addstr(&c, " thin-pack");
325 if (args->no_progress) strbuf_addstr(&c, " no-progress");
326 if (args->include_tag) strbuf_addstr(&c, " include-tag");
327 if (prefer_ofs_delta) strbuf_addstr(&c, " ofs-delta");
328 if (agent_supported) strbuf_addf(&c, " agent=%s",
329 git_user_agent_sanitized());
330 packet_buf_write(&req_buf, "want %s%s\n", remote_hex, c.buf);
331 strbuf_release(&c);
332 } else
333 packet_buf_write(&req_buf, "want %s\n", remote_hex);
334 fetching++;
335 }
336
337 if (!fetching) {
338 strbuf_release(&req_buf);
339 packet_flush(fd[1]);
340 return 1;
341 }
342
343 if (is_repository_shallow())
344 write_shallow_commits(&req_buf, 1);
345 if (args->depth > 0)
346 packet_buf_write(&req_buf, "deepen %d", args->depth);
347 packet_buf_flush(&req_buf);
348 state_len = req_buf.len;
349
350 if (args->depth > 0) {
74543a04 351 char *line;
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NTND
352 unsigned char sha1[20];
353
354 send_request(args, fd[1], &req_buf);
74543a04 355 while ((line = packet_read_line(fd[0], NULL))) {
745f7a8c
NTND
356 if (!prefixcmp(line, "shallow ")) {
357 if (get_sha1_hex(line + 8, sha1))
358 die("invalid shallow line: %s", line);
359 register_shallow(sha1);
360 continue;
361 }
362 if (!prefixcmp(line, "unshallow ")) {
363 if (get_sha1_hex(line + 10, sha1))
364 die("invalid unshallow line: %s", line);
365 if (!lookup_object(sha1))
366 die("object not found: %s", line);
367 /* make sure that it is parsed as shallow */
368 if (!parse_object(sha1))
369 die("error in object: %s", line);
370 if (unregister_shallow(sha1))
371 die("no shallow found: %s", line);
372 continue;
373 }
374 die("expected shallow/unshallow, got %s", line);
375 }
376 } else if (!args->stateless_rpc)
377 send_request(args, fd[1], &req_buf);
378
379 if (!args->stateless_rpc) {
380 /* If we aren't using the stateless-rpc interface
381 * we don't need to retain the headers.
382 */
383 strbuf_setlen(&req_buf, 0);
384 state_len = 0;
385 }
386
387 flushes = 0;
388 retval = -1;
389 while ((sha1 = get_rev())) {
390 packet_buf_write(&req_buf, "have %s\n", sha1_to_hex(sha1));
391 if (args->verbose)
392 fprintf(stderr, "have %s\n", sha1_to_hex(sha1));
393 in_vain++;
394 if (flush_at <= ++count) {
395 int ack;
396
397 packet_buf_flush(&req_buf);
398 send_request(args, fd[1], &req_buf);
399 strbuf_setlen(&req_buf, state_len);
400 flushes++;
401 flush_at = next_flush(args, count);
402
403 /*
404 * We keep one window "ahead" of the other side, and
405 * will wait for an ACK only on the next one
406 */
407 if (!args->stateless_rpc && count == INITIAL_FLUSH)
408 continue;
409
410 consume_shallow_list(args, fd[0]);
411 do {
412 ack = get_ack(fd[0], result_sha1);
413 if (args->verbose && ack)
414 fprintf(stderr, "got ack %d %s\n", ack,
415 sha1_to_hex(result_sha1));
416 switch (ack) {
417 case ACK:
418 flushes = 0;
419 multi_ack = 0;
420 retval = 0;
421 goto done;
422 case ACK_common:
423 case ACK_ready:
424 case ACK_continue: {
425 struct commit *commit =
426 lookup_commit(result_sha1);
427 if (!commit)
428 die("invalid commit %s", sha1_to_hex(result_sha1));
429 if (args->stateless_rpc
430 && ack == ACK_common
431 && !(commit->object.flags & COMMON)) {
432 /* We need to replay the have for this object
433 * on the next RPC request so the peer knows
434 * it is in common with us.
435 */
436 const char *hex = sha1_to_hex(result_sha1);
437 packet_buf_write(&req_buf, "have %s\n", hex);
438 state_len = req_buf.len;
439 }
440 mark_common(commit, 0, 1);
441 retval = 0;
442 in_vain = 0;
443 got_continue = 1;
444 if (ack == ACK_ready) {
445 rev_list = NULL;
446 got_ready = 1;
447 }
448 break;
449 }
450 }
451 } while (ack);
452 flushes--;
453 if (got_continue && MAX_IN_VAIN < in_vain) {
454 if (args->verbose)
455 fprintf(stderr, "giving up\n");
456 break; /* give up */
457 }
458 }
459 }
460done:
461 if (!got_ready || !no_done) {
462 packet_buf_write(&req_buf, "done\n");
463 send_request(args, fd[1], &req_buf);
464 }
465 if (args->verbose)
466 fprintf(stderr, "done\n");
467 if (retval != 0) {
468 multi_ack = 0;
469 flushes++;
470 }
471 strbuf_release(&req_buf);
472
473 consume_shallow_list(args, fd[0]);
474 while (flushes || multi_ack) {
475 int ack = get_ack(fd[0], result_sha1);
476 if (ack) {
477 if (args->verbose)
478 fprintf(stderr, "got ack (%d) %s\n", ack,
479 sha1_to_hex(result_sha1));
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}
490
491static struct commit_list *complete;
492
493static int mark_complete(const char *refname, const unsigned char *sha1, int flag, void *cb_data)
494{
495 struct object *o = parse_object(sha1);
496
497 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(t->tagged->sha1);
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_by_date(commit, &complete);
509 }
510 }
511 return 0;
512}
513
514static void mark_recent_complete_commits(struct fetch_pack_args *args,
515 unsigned long cutoff)
516{
517 while (complete && cutoff <= complete->item->date) {
518 if (args->verbose)
519 fprintf(stderr, "Marking %s as complete\n",
520 sha1_to_hex(complete->item->object.sha1));
521 pop_most_recent_commit(&complete, COMPLETE);
522 }
523}
524
745f7a8c 525static void filter_refs(struct fetch_pack_args *args,
f2db854d
JH
526 struct ref **refs,
527 struct ref **sought, int nr_sought)
745f7a8c
NTND
528{
529 struct ref *newlist = NULL;
530 struct ref **newtail = &newlist;
531 struct ref *ref, *next;
f2db854d 532 int i;
745f7a8c 533
f2db854d 534 i = 0;
745f7a8c
NTND
535 for (ref = *refs; ref; ref = next) {
536 int keep = 0;
537 next = ref->next;
f2db854d 538
745f7a8c
NTND
539 if (!memcmp(ref->name, "refs/", 5) &&
540 check_refname_format(ref->name + 5, 0))
541 ; /* trash */
542 else {
f2db854d
JH
543 while (i < nr_sought) {
544 int cmp = strcmp(ref->name, sought[i]->name);
745f7a8c
NTND
545 if (cmp < 0)
546 break; /* definitely do not have it */
547 else if (cmp == 0) {
548 keep = 1; /* definitely have it */
f2db854d 549 sought[i]->matched = 1;
745f7a8c 550 }
f2db854d 551 i++;
745f7a8c
NTND
552 }
553 }
554
f2db854d 555 if (!keep && args->fetch_all &&
745f7a8c
NTND
556 (!args->depth || prefixcmp(ref->name, "refs/tags/")))
557 keep = 1;
558
559 if (keep) {
560 *newtail = ref;
561 ref->next = NULL;
562 newtail = &ref->next;
563 } else {
564 free(ref);
565 }
566 }
567
6e7b66ee
JH
568 /* Append unmatched requests to the list */
569 if (allow_tip_sha1_in_want) {
570 for (i = 0; i < nr_sought; i++) {
571 ref = sought[i];
572 if (ref->matched)
573 continue;
574 if (get_sha1_hex(ref->name, ref->old_sha1))
575 continue;
576
577 ref->matched = 1;
578 *newtail = ref;
579 ref->next = NULL;
580 newtail = &ref->next;
581 }
582 }
745f7a8c
NTND
583 *refs = newlist;
584}
585
586static void mark_alternate_complete(const struct ref *ref, void *unused)
587{
588 mark_complete(NULL, ref->old_sha1, 0, NULL);
589}
590
591static int everything_local(struct fetch_pack_args *args,
f2db854d
JH
592 struct ref **refs,
593 struct ref **sought, int nr_sought)
745f7a8c
NTND
594{
595 struct ref *ref;
596 int retval;
597 unsigned long cutoff = 0;
598
599 save_commit_buffer = 0;
600
601 for (ref = *refs; ref; ref = ref->next) {
602 struct object *o;
603
012a1bb5
JH
604 if (!has_sha1_file(ref->old_sha1))
605 continue;
606
745f7a8c
NTND
607 o = parse_object(ref->old_sha1);
608 if (!o)
609 continue;
610
611 /* We already have it -- which may mean that we were
612 * in sync with the other side at some time after
613 * that (it is OK if we guess wrong here).
614 */
615 if (o->type == OBJ_COMMIT) {
616 struct commit *commit = (struct commit *)o;
617 if (!cutoff || cutoff < commit->date)
618 cutoff = commit->date;
619 }
620 }
621
622 if (!args->depth) {
623 for_each_ref(mark_complete, NULL);
624 for_each_alternate_ref(mark_alternate_complete, NULL);
625 if (cutoff)
626 mark_recent_complete_commits(args, cutoff);
627 }
628
629 /*
630 * Mark all complete remote refs as common refs.
631 * Don't mark them common yet; the server has to be told so first.
632 */
633 for (ref = *refs; ref; ref = ref->next) {
634 struct object *o = deref_tag(lookup_object(ref->old_sha1),
635 NULL, 0);
636
637 if (!o || o->type != OBJ_COMMIT || !(o->flags & COMPLETE))
638 continue;
639
640 if (!(o->flags & SEEN)) {
641 rev_list_push((struct commit *)o, COMMON_REF | SEEN);
642
643 mark_common((struct commit *)o, 1, 1);
644 }
645 }
646
f2db854d 647 filter_refs(args, refs, sought, nr_sought);
745f7a8c
NTND
648
649 for (retval = 1, ref = *refs; ref ; ref = ref->next) {
650 const unsigned char *remote = ref->old_sha1;
651 unsigned char local[20];
652 struct object *o;
653
654 o = lookup_object(remote);
655 if (!o || !(o->flags & COMPLETE)) {
656 retval = 0;
657 if (!args->verbose)
658 continue;
659 fprintf(stderr,
660 "want %s (%s)\n", sha1_to_hex(remote),
661 ref->name);
662 continue;
663 }
664
665 hashcpy(ref->new_sha1, local);
666 if (!args->verbose)
667 continue;
668 fprintf(stderr,
669 "already have %s (%s)\n", sha1_to_hex(remote),
670 ref->name);
671 }
672 return retval;
673}
674
675static int sideband_demux(int in, int out, void *data)
676{
677 int *xd = data;
678
679 int ret = recv_sideband("fetch-pack", xd[0], out);
680 close(out);
681 return ret;
682}
683
684static int get_pack(struct fetch_pack_args *args,
685 int xd[2], char **pack_lockfile)
686{
687 struct async demux;
6035d6aa 688 const char *argv[22];
745f7a8c
NTND
689 char keep_arg[256];
690 char hdr_arg[256];
691 const char **av;
692 int do_keep = args->keep_pack;
693 struct child_process cmd;
694
695 memset(&demux, 0, sizeof(demux));
696 if (use_sideband) {
697 /* xd[] is talking with upload-pack; subprocess reads from
698 * xd[0], spits out band#2 to stderr, and feeds us band#1
699 * through demux->out.
700 */
701 demux.proc = sideband_demux;
702 demux.data = xd;
703 demux.out = -1;
704 if (start_async(&demux))
705 die("fetch-pack: unable to fork off sideband"
706 " demultiplexer");
707 }
708 else
709 demux.out = xd[0];
710
711 memset(&cmd, 0, sizeof(cmd));
712 cmd.argv = argv;
713 av = argv;
714 *hdr_arg = 0;
715 if (!args->keep_pack && unpack_limit) {
716 struct pack_header header;
717
718 if (read_pack_header(demux.out, &header))
719 die("protocol error: bad pack header");
720 snprintf(hdr_arg, sizeof(hdr_arg),
721 "--pack_header=%"PRIu32",%"PRIu32,
722 ntohl(header.hdr_version), ntohl(header.hdr_entries));
723 if (ntohl(header.hdr_entries) < unpack_limit)
724 do_keep = 0;
725 else
726 do_keep = 1;
727 }
728
6035d6aa
NTND
729 if (alternate_shallow_file) {
730 *av++ = "--shallow-file";
731 *av++ = alternate_shallow_file;
732 }
733
745f7a8c
NTND
734 if (do_keep) {
735 if (pack_lockfile)
736 cmd.out = -1;
737 *av++ = "index-pack";
738 *av++ = "--stdin";
739 if (!args->quiet && !args->no_progress)
740 *av++ = "-v";
741 if (args->use_thin_pack)
742 *av++ = "--fix-thin";
743 if (args->lock_pack || unpack_limit) {
744 int s = sprintf(keep_arg,
745 "--keep=fetch-pack %"PRIuMAX " on ", (uintmax_t) getpid());
746 if (gethostname(keep_arg + s, sizeof(keep_arg) - s))
747 strcpy(keep_arg + s, "localhost");
748 *av++ = keep_arg;
749 }
750 }
751 else {
752 *av++ = "unpack-objects";
753 if (args->quiet || args->no_progress)
754 *av++ = "-q";
755 }
756 if (*hdr_arg)
757 *av++ = hdr_arg;
758 if (fetch_fsck_objects >= 0
759 ? fetch_fsck_objects
760 : transfer_fsck_objects >= 0
761 ? transfer_fsck_objects
762 : 0)
763 *av++ = "--strict";
764 *av++ = NULL;
765
766 cmd.in = demux.out;
767 cmd.git_cmd = 1;
768 if (start_command(&cmd))
769 die("fetch-pack: unable to fork off %s", argv[0]);
770 if (do_keep && pack_lockfile) {
771 *pack_lockfile = index_pack_lockfile(cmd.out);
772 close(cmd.out);
773 }
774
775 if (finish_command(&cmd))
776 die("%s failed", argv[0]);
777 if (use_sideband && finish_async(&demux))
778 die("error in sideband demultiplexer");
779 return 0;
780}
781
f2db854d
JH
782static int cmp_ref_by_name(const void *a_, const void *b_)
783{
784 const struct ref *a = *((const struct ref **)a_);
785 const struct ref *b = *((const struct ref **)b_);
786 return strcmp(a->name, b->name);
787}
788
6035d6aa
NTND
789static void setup_alternate_shallow(void)
790{
791 struct strbuf sb = STRBUF_INIT;
792 int fd;
793
794 check_shallow_file_for_update();
795 fd = hold_lock_file_for_update(&shallow_lock, git_path("shallow"),
796 LOCK_DIE_ON_ERROR);
797 if (write_shallow_commits(&sb, 0)) {
798 if (write_in_full(fd, sb.buf, sb.len) != sb.len)
799 die_errno("failed to write to %s", shallow_lock.filename);
800 alternate_shallow_file = shallow_lock.filename;
801 } else
802 /*
803 * is_repository_shallow() sees empty string as "no
804 * shallow file".
805 */
806 alternate_shallow_file = "";
807 strbuf_release(&sb);
808}
809
745f7a8c
NTND
810static struct ref *do_fetch_pack(struct fetch_pack_args *args,
811 int fd[2],
812 const struct ref *orig_ref,
f2db854d 813 struct ref **sought, int nr_sought,
745f7a8c
NTND
814 char **pack_lockfile)
815{
816 struct ref *ref = copy_ref_list(orig_ref);
817 unsigned char sha1[20];
818 const char *agent_feature;
819 int agent_len;
820
821 sort_ref_list(&ref, ref_compare_name);
f2db854d 822 qsort(sought, nr_sought, sizeof(*sought), cmp_ref_by_name);
745f7a8c
NTND
823
824 if (is_repository_shallow() && !server_supports("shallow"))
825 die("Server does not support shallow clients");
826 if (server_supports("multi_ack_detailed")) {
827 if (args->verbose)
828 fprintf(stderr, "Server supports multi_ack_detailed\n");
829 multi_ack = 2;
830 if (server_supports("no-done")) {
831 if (args->verbose)
832 fprintf(stderr, "Server supports no-done\n");
833 if (args->stateless_rpc)
834 no_done = 1;
835 }
836 }
837 else if (server_supports("multi_ack")) {
838 if (args->verbose)
839 fprintf(stderr, "Server supports multi_ack\n");
840 multi_ack = 1;
841 }
842 if (server_supports("side-band-64k")) {
843 if (args->verbose)
844 fprintf(stderr, "Server supports side-band-64k\n");
845 use_sideband = 2;
846 }
847 else if (server_supports("side-band")) {
848 if (args->verbose)
849 fprintf(stderr, "Server supports side-band\n");
850 use_sideband = 1;
851 }
6e7b66ee
JH
852 if (server_supports("allow-tip-sha1-in-want")) {
853 if (args->verbose)
854 fprintf(stderr, "Server supports allow-tip-sha1-in-want\n");
855 allow_tip_sha1_in_want = 1;
856 }
745f7a8c
NTND
857 if (!server_supports("thin-pack"))
858 args->use_thin_pack = 0;
859 if (!server_supports("no-progress"))
860 args->no_progress = 0;
861 if (!server_supports("include-tag"))
862 args->include_tag = 0;
863 if (server_supports("ofs-delta")) {
864 if (args->verbose)
865 fprintf(stderr, "Server supports ofs-delta\n");
866 } else
867 prefer_ofs_delta = 0;
868
869 if ((agent_feature = server_feature_value("agent", &agent_len))) {
870 agent_supported = 1;
871 if (args->verbose && agent_len)
872 fprintf(stderr, "Server version is %.*s\n",
873 agent_len, agent_feature);
874 }
875
f2db854d 876 if (everything_local(args, &ref, sought, nr_sought)) {
745f7a8c
NTND
877 packet_flush(fd[1]);
878 goto all_done;
879 }
880 if (find_common(args, fd, sha1, ref) < 0)
881 if (!args->keep_pack)
882 /* When cloning, it is not unusual to have
883 * no common commit.
884 */
885 warning("no common commits");
886
887 if (args->stateless_rpc)
888 packet_flush(fd[1]);
6035d6aa
NTND
889 if (args->depth > 0)
890 setup_alternate_shallow();
745f7a8c
NTND
891 if (get_pack(args, fd, pack_lockfile))
892 die("git fetch-pack: fetch failed.");
893
894 all_done:
895 return ref;
896}
897
898static int fetch_pack_config(const char *var, const char *value, void *cb)
899{
900 if (strcmp(var, "fetch.unpacklimit") == 0) {
901 fetch_unpack_limit = git_config_int(var, value);
902 return 0;
903 }
904
905 if (strcmp(var, "transfer.unpacklimit") == 0) {
906 transfer_unpack_limit = git_config_int(var, value);
907 return 0;
908 }
909
910 if (strcmp(var, "repack.usedeltabaseoffset") == 0) {
911 prefer_ofs_delta = git_config_bool(var, value);
912 return 0;
913 }
914
915 if (!strcmp(var, "fetch.fsckobjects")) {
916 fetch_fsck_objects = git_config_bool(var, value);
917 return 0;
918 }
919
920 if (!strcmp(var, "transfer.fsckobjects")) {
921 transfer_fsck_objects = git_config_bool(var, value);
922 return 0;
923 }
924
925 return git_default_config(var, value, cb);
926}
927
745f7a8c
NTND
928static void fetch_pack_setup(void)
929{
930 static int did_setup;
931 if (did_setup)
932 return;
933 git_config(fetch_pack_config, NULL);
934 if (0 <= transfer_unpack_limit)
935 unpack_limit = transfer_unpack_limit;
936 else if (0 <= fetch_unpack_limit)
937 unpack_limit = fetch_unpack_limit;
938 did_setup = 1;
939}
940
f2db854d
JH
941static int remove_duplicates_in_refs(struct ref **ref, int nr)
942{
943 struct string_list names = STRING_LIST_INIT_NODUP;
944 int src, dst;
945
946 for (src = dst = 0; src < nr; src++) {
947 struct string_list_item *item;
948 item = string_list_insert(&names, ref[src]->name);
949 if (item->util)
950 continue; /* already have it */
951 item->util = ref[src];
952 if (src != dst)
953 ref[dst] = ref[src];
954 dst++;
955 }
956 for (src = dst; src < nr; src++)
957 ref[src] = NULL;
958 string_list_clear(&names, 0);
959 return dst;
960}
961
745f7a8c
NTND
962struct ref *fetch_pack(struct fetch_pack_args *args,
963 int fd[], struct child_process *conn,
964 const struct ref *ref,
965 const char *dest,
f2db854d 966 struct ref **sought, int nr_sought,
745f7a8c
NTND
967 char **pack_lockfile)
968{
745f7a8c
NTND
969 struct ref *ref_cpy;
970
971 fetch_pack_setup();
f2db854d
JH
972 if (nr_sought)
973 nr_sought = remove_duplicates_in_refs(sought, nr_sought);
745f7a8c
NTND
974
975 if (!ref) {
976 packet_flush(fd[1]);
977 die("no matching remote head");
978 }
f2db854d 979 ref_cpy = do_fetch_pack(args, fd, ref, sought, nr_sought, pack_lockfile);
745f7a8c 980
6035d6aa
NTND
981 if (alternate_shallow_file) {
982 if (*alternate_shallow_file == '\0') { /* --unshallow */
983 unlink_or_warn(git_path("shallow"));
984 rollback_lock_file(&shallow_lock);
985 } else
986 commit_lock_file(&shallow_lock);
745f7a8c
NTND
987 }
988
989 reprepare_packed_git();
990 return ref_cpy;
991}