fetch-pack: avoid object flags if no_dependents
[git/git.git] / fetch-pack.c
CommitLineData
745f7a8c 1#include "cache.h"
a49d2834 2#include "repository.h"
b2141fc1 3#include "config.h"
697cc8ef 4#include "lockfile.h"
745f7a8c
NTND
5#include "refs.h"
6#include "pkt-line.h"
7#include "commit.h"
8#include "tag.h"
d807c4a0 9#include "exec-cmd.h"
745f7a8c
NTND
10#include "pack.h"
11#include "sideband.h"
12#include "fetch-pack.h"
13#include "remote.h"
14#include "run-command.h"
47a59185 15#include "connect.h"
745f7a8c
NTND
16#include "transport.h"
17#include "version.h"
beea4152 18#include "sha1-array.h"
fdb69d33 19#include "oidset.h"
0abe14f6 20#include "packfile.h"
cbd53a21 21#include "object-store.h"
cf1e7c07 22#include "connected.h"
ec062838 23#include "fetch-negotiator.h"
1362df0d 24#include "fsck.h"
745f7a8c
NTND
25
26static 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;
508ea882 31static int deepen_since_ok;
a45a2600 32static int deepen_not_ok;
745f7a8c
NTND
33static int fetch_fsck_objects = -1;
34static int transfer_fsck_objects = -1;
35static int agent_supported;
640d8b72 36static int server_supports_filtering;
6035d6aa
NTND
37static struct lock_file shallow_lock;
38static const char *alternate_shallow_file;
42cc7485 39static char *negotiation_algorithm;
1362df0d 40static struct strbuf fsck_msg_types = STRBUF_INIT;
745f7a8c 41
208acbfb 42/* Remember to update object flag allocation in object.h */
745f7a8c 43#define COMPLETE (1U << 0)
ec062838 44#define ALTERNATE (1U << 1)
745f7a8c
NTND
45
46/*
47 * After sending this many "have"s if we do not get any new ACK , we
48 * give up traversing our history.
49 */
50#define MAX_IN_VAIN 256
51
d30fe89c 52static int multi_ack, use_sideband;
7199c093
FM
53/* Allow specifying sha1 if it is a ref tip. */
54#define ALLOW_TIP_SHA1 01
68ee6289
FM
55/* Allow request of a sha1 if it is reachable from a ref (possibly hidden ref). */
56#define ALLOW_REACHABLE_SHA1 02
7199c093 57static unsigned int allow_unadvertised_object_request;
745f7a8c 58
0d789a5b
NTND
59__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
65 if (!args->verbose)
66 return;
67
68 va_start(params, fmt);
69 vfprintf(stderr, fmt, params);
70 va_end(params);
71 fputc('\n', stderr);
72}
73
41a078c6
JK
74struct alternate_object_cache {
75 struct object **items;
76 size_t nr, alloc;
77};
78
79static void cache_one_alternate(const char *refname,
80 const struct object_id *oid,
81 void *vcache)
82{
83 struct alternate_object_cache *cache = vcache;
109cd76d 84 struct object *obj = parse_object(the_repository, oid);
41a078c6
JK
85
86 if (!obj || (obj->flags & ALTERNATE))
87 return;
88
89 obj->flags |= ALTERNATE;
90 ALLOC_GROW(cache->items, cache->nr + 1, cache->alloc);
91 cache->items[cache->nr++] = obj;
92}
93
ec062838
JT
94static void for_each_cached_alternate(struct fetch_negotiator *negotiator,
95 void (*cb)(struct fetch_negotiator *,
d30fe89c 96 struct object *))
41a078c6
JK
97{
98 static int initialized;
99 static struct alternate_object_cache cache;
100 size_t i;
101
102 if (!initialized) {
103 for_each_alternate_ref(cache_one_alternate, &cache);
104 initialized = 1;
105 }
106
107 for (i = 0; i < cache.nr; i++)
ec062838 108 cb(negotiator, cache.items[i]);
745f7a8c
NTND
109}
110
ec062838 111static int rev_list_insert_ref(struct fetch_negotiator *negotiator,
d30fe89c
JT
112 const char *refname,
113 const struct object_id *oid)
745f7a8c 114{
a74093da
SB
115 struct object *o = deref_tag(the_repository,
116 parse_object(the_repository, oid),
109cd76d 117 refname, 0);
745f7a8c
NTND
118
119 if (o && o->type == OBJ_COMMIT)
ec062838 120 negotiator->add_tip(negotiator, (struct commit *)o);
745f7a8c
NTND
121
122 return 0;
123}
124
b1b49c6e
MH
125static int rev_list_insert_ref_oid(const char *refname, const struct object_id *oid,
126 int flag, void *cb_data)
745f7a8c 127{
d30fe89c 128 return rev_list_insert_ref(cb_data, refname, oid);
745f7a8c
NTND
129}
130
131enum ack_type {
132 NAK = 0,
133 ACK,
134 ACK_continue,
135 ACK_common,
136 ACK_ready
137};
138
139static void consume_shallow_list(struct fetch_pack_args *args, int fd)
140{
79891cb9 141 if (args->stateless_rpc && args->deepen) {
745f7a8c
NTND
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 */
74543a04
JK
146 char *line;
147 while ((line = packet_read_line(fd, NULL))) {
59556548 148 if (starts_with(line, "shallow "))
745f7a8c 149 continue;
59556548 150 if (starts_with(line, "unshallow "))
745f7a8c 151 continue;
1dd73e20 152 die(_("git fetch-pack: expected shallow list"));
745f7a8c
NTND
153 }
154 }
155}
156
1b283377 157static enum ack_type get_ack(int fd, struct object_id *result_oid)
745f7a8c 158{
74543a04
JK
159 int len;
160 char *line = packet_read_line(fd, &len);
82e56767 161 const char *arg;
745f7a8c 162
bc9d4dc5
JK
163 if (!line)
164 die(_("git fetch-pack: expected ACK/NAK, got a flush packet"));
745f7a8c
NTND
165 if (!strcmp(line, "NAK"))
166 return NAK;
82e56767 167 if (skip_prefix(line, "ACK ", &arg)) {
1b283377 168 if (!get_oid_hex(arg, result_oid)) {
82e56767
JK
169 arg += 40;
170 len -= arg - line;
171 if (len < 1)
030e9dd6 172 return ACK;
82e56767 173 if (strstr(arg, "continue"))
745f7a8c 174 return ACK_continue;
82e56767 175 if (strstr(arg, "common"))
745f7a8c 176 return ACK_common;
82e56767 177 if (strstr(arg, "ready"))
745f7a8c
NTND
178 return ACK_ready;
179 return ACK;
180 }
181 }
8e2c7bef
JT
182 if (skip_prefix(line, "ERR ", &arg))
183 die(_("remote error: %s"), arg);
dfbfb9f3 184 die(_("git fetch-pack: expected ACK/NAK, got '%s'"), line);
745f7a8c
NTND
185}
186
187static void send_request(struct fetch_pack_args *args,
188 int fd, struct strbuf *buf)
189{
190 if (args->stateless_rpc) {
191 send_sideband(fd, -1, buf->buf, buf->len, LARGE_PACKET_MAX);
192 packet_flush(fd);
193 } else
cdf4fb8e 194 write_or_die(fd, buf->buf, buf->len);
745f7a8c
NTND
195}
196
ec062838 197static void insert_one_alternate_object(struct fetch_negotiator *negotiator,
d30fe89c 198 struct object *obj)
745f7a8c 199{
ec062838 200 rev_list_insert_ref(negotiator, NULL, &obj->oid);
745f7a8c
NTND
201}
202
203#define INITIAL_FLUSH 16
204#define PIPESAFE_FLUSH 32
da470981 205#define LARGE_FLUSH 16384
745f7a8c 206
685fbd32 207static int next_flush(int stateless_rpc, int count)
745f7a8c 208{
685fbd32 209 if (stateless_rpc) {
da470981
JT
210 if (count < LARGE_FLUSH)
211 count <<= 1;
212 else
213 count = count * 11 / 10;
214 } else {
215 if (count < PIPESAFE_FLUSH)
216 count <<= 1;
217 else
218 count += PIPESAFE_FLUSH;
219 }
745f7a8c
NTND
220 return count;
221}
222
3390e42a
JT
223static void mark_tips(struct fetch_negotiator *negotiator,
224 const struct oid_array *negotiation_tips)
225{
226 int i;
227
228 if (!negotiation_tips) {
229 for_each_ref(rev_list_insert_ref_oid, negotiator);
230 return;
231 }
232
233 for (i = 0; i < negotiation_tips->nr; i++)
234 rev_list_insert_ref(negotiator, NULL,
235 &negotiation_tips->oid[i]);
236 return;
237}
238
ec062838 239static int find_common(struct fetch_negotiator *negotiator,
d30fe89c 240 struct fetch_pack_args *args,
1b283377 241 int fd[2], struct object_id *result_oid,
745f7a8c
NTND
242 struct ref *refs)
243{
244 int fetching;
245 int count = 0, flushes = 0, flush_at = INITIAL_FLUSH, retval;
1b283377 246 const struct object_id *oid;
745f7a8c
NTND
247 unsigned in_vain = 0;
248 int got_continue = 0;
249 int got_ready = 0;
250 struct strbuf req_buf = STRBUF_INIT;
251 size_t state_len = 0;
252
253 if (args->stateless_rpc && multi_ack == 1)
1dd73e20 254 die(_("--stateless-rpc requires multi_ack_detailed"));
745f7a8c 255
12f19a98
JT
256 if (!args->no_dependents) {
257 mark_tips(negotiator, args->negotiation_tips);
258 for_each_cached_alternate(negotiator, insert_one_alternate_object);
259 }
745f7a8c
NTND
260
261 fetching = 0;
262 for ( ; refs ; refs = refs->next) {
1b283377 263 struct object_id *remote = &refs->old_oid;
745f7a8c
NTND
264 const char *remote_hex;
265 struct object *o;
266
267 /*
268 * If that object is complete (i.e. it is an ancestor of a
269 * local ref), we tell them we have it but do not have to
270 * tell them about its ancestors, which they already know
271 * about.
272 *
273 * We use lookup_object here because we are only
274 * interested in the case we *know* the object is
275 * reachable and we have already scanned it.
12f19a98
JT
276 *
277 * Do this only if args->no_dependents is false (if it is true,
278 * we cannot trust the object flags).
745f7a8c 279 */
12f19a98
JT
280 if (!args->no_dependents &&
281 ((o = lookup_object(the_repository, remote->hash)) != NULL) &&
745f7a8c
NTND
282 (o->flags & COMPLETE)) {
283 continue;
284 }
285
1b283377 286 remote_hex = oid_to_hex(remote);
745f7a8c
NTND
287 if (!fetching) {
288 struct strbuf c = STRBUF_INIT;
289 if (multi_ack == 2) strbuf_addstr(&c, " multi_ack_detailed");
290 if (multi_ack == 1) strbuf_addstr(&c, " multi_ack");
291 if (no_done) strbuf_addstr(&c, " no-done");
292 if (use_sideband == 2) strbuf_addstr(&c, " side-band-64k");
293 if (use_sideband == 1) strbuf_addstr(&c, " side-band");
cccf74e2 294 if (args->deepen_relative) strbuf_addstr(&c, " deepen-relative");
745f7a8c
NTND
295 if (args->use_thin_pack) strbuf_addstr(&c, " thin-pack");
296 if (args->no_progress) strbuf_addstr(&c, " no-progress");
297 if (args->include_tag) strbuf_addstr(&c, " include-tag");
298 if (prefer_ofs_delta) strbuf_addstr(&c, " ofs-delta");
508ea882 299 if (deepen_since_ok) strbuf_addstr(&c, " deepen-since");
a45a2600 300 if (deepen_not_ok) strbuf_addstr(&c, " deepen-not");
745f7a8c
NTND
301 if (agent_supported) strbuf_addf(&c, " agent=%s",
302 git_user_agent_sanitized());
640d8b72
JH
303 if (args->filter_options.choice)
304 strbuf_addstr(&c, " filter");
745f7a8c
NTND
305 packet_buf_write(&req_buf, "want %s%s\n", remote_hex, c.buf);
306 strbuf_release(&c);
307 } else
308 packet_buf_write(&req_buf, "want %s\n", remote_hex);
309 fetching++;
310 }
311
312 if (!fetching) {
313 strbuf_release(&req_buf);
314 packet_flush(fd[1]);
315 return 1;
316 }
317
c8813487 318 if (is_repository_shallow(the_repository))
1a30f5a2 319 write_shallow_commits(&req_buf, 1, NULL);
745f7a8c
NTND
320 if (args->depth > 0)
321 packet_buf_write(&req_buf, "deepen %d", args->depth);
508ea882 322 if (args->deepen_since) {
dddbad72 323 timestamp_t max_age = approxidate(args->deepen_since);
cb71f8bd 324 packet_buf_write(&req_buf, "deepen-since %"PRItime, max_age);
508ea882 325 }
a45a2600
NTND
326 if (args->deepen_not) {
327 int i;
328 for (i = 0; i < args->deepen_not->nr; i++) {
329 struct string_list_item *s = args->deepen_not->items + i;
330 packet_buf_write(&req_buf, "deepen-not %s", s->string);
331 }
332 }
640d8b72
JH
333 if (server_supports_filtering && args->filter_options.choice)
334 packet_buf_write(&req_buf, "filter %s",
335 args->filter_options.filter_spec);
745f7a8c
NTND
336 packet_buf_flush(&req_buf);
337 state_len = req_buf.len;
338
79891cb9 339 if (args->deepen) {
74543a04 340 char *line;
ae021d87 341 const char *arg;
1b283377 342 struct object_id oid;
745f7a8c
NTND
343
344 send_request(args, fd[1], &req_buf);
74543a04 345 while ((line = packet_read_line(fd[0], NULL))) {
ae021d87 346 if (skip_prefix(line, "shallow ", &arg)) {
1b283377 347 if (get_oid_hex(arg, &oid))
1dd73e20 348 die(_("invalid shallow line: %s"), line);
19143f13 349 register_shallow(the_repository, &oid);
745f7a8c
NTND
350 continue;
351 }
ae021d87 352 if (skip_prefix(line, "unshallow ", &arg)) {
1b283377 353 if (get_oid_hex(arg, &oid))
1dd73e20 354 die(_("invalid unshallow line: %s"), line);
5abddd1e 355 if (!lookup_object(the_repository, oid.hash))
1dd73e20 356 die(_("object not found: %s"), line);
745f7a8c 357 /* make sure that it is parsed as shallow */
109cd76d 358 if (!parse_object(the_repository, &oid))
1dd73e20 359 die(_("error in object: %s"), line);
e92b848c 360 if (unregister_shallow(&oid))
1dd73e20 361 die(_("no shallow found: %s"), line);
745f7a8c
NTND
362 continue;
363 }
1dd73e20 364 die(_("expected shallow/unshallow, got %s"), line);
745f7a8c
NTND
365 }
366 } else if (!args->stateless_rpc)
367 send_request(args, fd[1], &req_buf);
368
369 if (!args->stateless_rpc) {
370 /* If we aren't using the stateless-rpc interface
371 * we don't need to retain the headers.
372 */
373 strbuf_setlen(&req_buf, 0);
374 state_len = 0;
375 }
376
377 flushes = 0;
378 retval = -1;
88e2f9ed
JT
379 if (args->no_dependents)
380 goto done;
ec062838 381 while ((oid = negotiator->next(negotiator))) {
1b283377 382 packet_buf_write(&req_buf, "have %s\n", oid_to_hex(oid));
383 print_verbose(args, "have %s", oid_to_hex(oid));
745f7a8c
NTND
384 in_vain++;
385 if (flush_at <= ++count) {
386 int ack;
387
388 packet_buf_flush(&req_buf);
389 send_request(args, fd[1], &req_buf);
390 strbuf_setlen(&req_buf, state_len);
391 flushes++;
685fbd32 392 flush_at = next_flush(args->stateless_rpc, count);
745f7a8c
NTND
393
394 /*
395 * We keep one window "ahead" of the other side, and
396 * will wait for an ACK only on the next one
397 */
398 if (!args->stateless_rpc && count == INITIAL_FLUSH)
399 continue;
400
401 consume_shallow_list(args, fd[0]);
402 do {
1b283377 403 ack = get_ack(fd[0], result_oid);
0d789a5b 404 if (ack)
1dd73e20 405 print_verbose(args, _("got %s %d %s"), "ack",
1b283377 406 ack, oid_to_hex(result_oid));
745f7a8c
NTND
407 switch (ack) {
408 case ACK:
409 flushes = 0;
410 multi_ack = 0;
411 retval = 0;
412 goto done;
413 case ACK_common:
414 case ACK_ready:
415 case ACK_continue: {
416 struct commit *commit =
c1f5eb49
SB
417 lookup_commit(the_repository,
418 result_oid);
d093bc75 419 int was_common;
3a2a1dc1 420
745f7a8c 421 if (!commit)
1b283377 422 die(_("invalid commit %s"), oid_to_hex(result_oid));
ec062838 423 was_common = negotiator->ack(negotiator, commit);
745f7a8c
NTND
424 if (args->stateless_rpc
425 && ack == ACK_common
d093bc75 426 && !was_common) {
745f7a8c
NTND
427 /* We need to replay the have for this object
428 * on the next RPC request so the peer knows
429 * it is in common with us.
430 */
1b283377 431 const char *hex = oid_to_hex(result_oid);
745f7a8c
NTND
432 packet_buf_write(&req_buf, "have %s\n", hex);
433 state_len = req_buf.len;
06b3d386
JT
434 /*
435 * Reset in_vain because an ack
436 * for this commit has not been
437 * seen.
438 */
439 in_vain = 0;
440 } else if (!args->stateless_rpc
441 || ack != ACK_common)
442 in_vain = 0;
745f7a8c 443 retval = 0;
745f7a8c 444 got_continue = 1;
21bcf6e4 445 if (ack == ACK_ready)
745f7a8c 446 got_ready = 1;
745f7a8c
NTND
447 break;
448 }
449 }
450 } while (ack);
451 flushes--;
452 if (got_continue && MAX_IN_VAIN < in_vain) {
1dd73e20 453 print_verbose(args, _("giving up"));
745f7a8c
NTND
454 break; /* give up */
455 }
21bcf6e4
JT
456 if (got_ready)
457 break;
745f7a8c
NTND
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 }
1dd73e20 465 print_verbose(args, _("done"));
745f7a8c
NTND
466 if (retval != 0) {
467 multi_ack = 0;
468 flushes++;
469 }
470 strbuf_release(&req_buf);
471
ff62eca7
NTND
472 if (!got_ready || !no_done)
473 consume_shallow_list(args, fd[0]);
745f7a8c 474 while (flushes || multi_ack) {
1b283377 475 int ack = get_ack(fd[0], result_oid);
745f7a8c 476 if (ack) {
1dd73e20 477 print_verbose(args, _("got %s (%d) %s"), "ack",
1b283377 478 ack, oid_to_hex(result_oid));
745f7a8c
NTND
479 if (ack == ACK)
480 return 0;
481 multi_ack = 1;
482 continue;
483 }
484 flushes--;
485 }
486 /* it is no error to fetch into a completely empty repo */
487 return count ? retval : 0;
488}
489
490static struct commit_list *complete;
491
1b283377 492static int mark_complete(const struct object_id *oid)
745f7a8c 493{
109cd76d 494 struct object *o = parse_object(the_repository, oid);
745f7a8c
NTND
495
496 while (o && o->type == OBJ_TAG) {
497 struct tag *t = (struct tag *) o;
498 if (!t->tagged)
499 break; /* broken repository */
500 o->flags |= COMPLETE;
109cd76d 501 o = parse_object(the_repository, &t->tagged->oid);
745f7a8c
NTND
502 }
503 if (o && o->type == OBJ_COMMIT) {
504 struct commit *commit = (struct commit *)o;
505 if (!(commit->object.flags & COMPLETE)) {
506 commit->object.flags |= COMPLETE;
16445242 507 commit_list_insert(commit, &complete);
745f7a8c
NTND
508 }
509 }
510 return 0;
511}
512
f8ee4d85
MH
513static int mark_complete_oid(const char *refname, const struct object_id *oid,
514 int flag, void *cb_data)
515{
1b283377 516 return mark_complete(oid);
f8ee4d85
MH
517}
518
745f7a8c 519static void mark_recent_complete_commits(struct fetch_pack_args *args,
dddbad72 520 timestamp_t cutoff)
745f7a8c
NTND
521{
522 while (complete && cutoff <= complete->item->date) {
1dd73e20 523 print_verbose(args, _("Marking %s as complete"),
0d789a5b 524 oid_to_hex(&complete->item->object.oid));
745f7a8c
NTND
525 pop_most_recent_commit(&complete, COMPLETE);
526 }
527}
528
fdb69d33
JT
529static void add_refs_to_oidset(struct oidset *oids, struct ref *refs)
530{
531 for (; refs; refs = refs->next)
532 oidset_insert(oids, &refs->old_oid);
533}
534
535static int tip_oids_contain(struct oidset *tip_oids,
536 struct ref *unmatched, struct ref *newlist,
537 const struct object_id *id)
538{
539 /*
540 * Note that this only looks at the ref lists the first time it's
541 * called. This works out in filter_refs() because even though it may
542 * add to "newlist" between calls, the additions will always be for
543 * oids that are already in the set.
544 */
9e6fabde 545 if (!tip_oids->map.map.tablesize) {
fdb69d33
JT
546 add_refs_to_oidset(tip_oids, unmatched);
547 add_refs_to_oidset(tip_oids, newlist);
548 }
549 return oidset_contains(tip_oids, id);
550}
551
745f7a8c 552static void filter_refs(struct fetch_pack_args *args,
f2db854d
JH
553 struct ref **refs,
554 struct ref **sought, int nr_sought)
745f7a8c
NTND
555{
556 struct ref *newlist = NULL;
557 struct ref **newtail = &newlist;
fdb69d33 558 struct ref *unmatched = NULL;
745f7a8c 559 struct ref *ref, *next;
fdb69d33 560 struct oidset tip_oids = OIDSET_INIT;
f2db854d 561 int i;
745f7a8c 562
f2db854d 563 i = 0;
745f7a8c
NTND
564 for (ref = *refs; ref; ref = next) {
565 int keep = 0;
566 next = ref->next;
f2db854d 567
50e19a83 568 if (starts_with(ref->name, "refs/") &&
4c224081 569 check_refname_format(ref->name, 0))
745f7a8c
NTND
570 ; /* trash */
571 else {
f2db854d
JH
572 while (i < nr_sought) {
573 int cmp = strcmp(ref->name, sought[i]->name);
745f7a8c
NTND
574 if (cmp < 0)
575 break; /* definitely do not have it */
576 else if (cmp == 0) {
577 keep = 1; /* definitely have it */
d56583de 578 sought[i]->match_status = REF_MATCHED;
745f7a8c 579 }
f2db854d 580 i++;
745f7a8c 581 }
745f7a8c 582
e9502c0a
JK
583 if (!keep && args->fetch_all &&
584 (!args->deepen || !starts_with(ref->name, "refs/tags/")))
585 keep = 1;
586 }
745f7a8c
NTND
587
588 if (keep) {
589 *newtail = ref;
590 ref->next = NULL;
591 newtail = &ref->next;
592 } else {
fdb69d33
JT
593 ref->next = unmatched;
594 unmatched = ref;
745f7a8c
NTND
595 }
596 }
597
6e7b66ee 598 /* Append unmatched requests to the list */
d56583de 599 for (i = 0; i < nr_sought; i++) {
1b283377 600 struct object_id oid;
601 const char *p;
b7916422 602
d56583de
MM
603 ref = sought[i];
604 if (ref->match_status != REF_NOT_MATCHED)
605 continue;
1b283377 606 if (parse_oid_hex(ref->name, &oid, &p) ||
607 *p != '\0' ||
608 oidcmp(&oid, &ref->old_oid))
d56583de 609 continue;
6e7b66ee 610
d56583de 611 if ((allow_unadvertised_object_request &
fdb69d33
JT
612 (ALLOW_TIP_SHA1 | ALLOW_REACHABLE_SHA1)) ||
613 tip_oids_contain(&tip_oids, unmatched, newlist,
614 &ref->old_oid)) {
d56583de 615 ref->match_status = REF_MATCHED;
c3c17bf1
JK
616 *newtail = copy_ref(ref);
617 newtail = &(*newtail)->next;
d56583de
MM
618 } else {
619 ref->match_status = REF_UNADVERTISED_NOT_ALLOWED;
6e7b66ee
JH
620 }
621 }
fdb69d33
JT
622
623 oidset_clear(&tip_oids);
624 for (ref = unmatched; ref; ref = next) {
625 next = ref->next;
626 free(ref);
627 }
628
745f7a8c
NTND
629 *refs = newlist;
630}
631
ec062838 632static void mark_alternate_complete(struct fetch_negotiator *unused,
d30fe89c 633 struct object *obj)
745f7a8c 634{
1b283377 635 mark_complete(&obj->oid);
745f7a8c
NTND
636}
637
024aa469
TI
638struct loose_object_iter {
639 struct oidset *loose_object_set;
640 struct ref *refs;
641};
642
643/*
644 * If the number of refs is not larger than the number of loose objects,
645 * this function stops inserting.
646 */
647static int add_loose_objects_to_set(const struct object_id *oid,
648 const char *path,
649 void *data)
650{
651 struct loose_object_iter *iter = data;
652 oidset_insert(iter->loose_object_set, oid);
653 if (iter->refs == NULL)
654 return 1;
655
656 iter->refs = iter->refs->next;
657 return 0;
658}
659
34c29034
JT
660/*
661 * Mark recent commits available locally and reachable from a local ref as
662 * COMPLETE. If args->no_dependents is false, also mark COMPLETE remote refs as
663 * COMMON_REF (otherwise, we are not planning to participate in negotiation, and
664 * thus do not need COMMON_REF marks).
665 *
666 * The cutoff time for recency is determined by this heuristic: it is the
667 * earliest commit time of the objects in refs that are commits and that we know
668 * the commit time of.
669 */
ec062838 670static void mark_complete_and_common_ref(struct fetch_negotiator *negotiator,
d30fe89c 671 struct fetch_pack_args *args,
34c29034 672 struct ref **refs)
745f7a8c
NTND
673{
674 struct ref *ref;
a1c6d7c1 675 int old_save_commit_buffer = save_commit_buffer;
dddbad72 676 timestamp_t cutoff = 0;
024aa469
TI
677 struct oidset loose_oid_set = OIDSET_INIT;
678 int use_oidset = 0;
679 struct loose_object_iter iter = {&loose_oid_set, *refs};
680
681 /* Enumerate all loose objects or know refs are not so many. */
682 use_oidset = !for_each_loose_object(add_loose_objects_to_set,
683 &iter, 0);
745f7a8c
NTND
684
685 save_commit_buffer = 0;
686
687 for (ref = *refs; ref; ref = ref->next) {
688 struct object *o;
024aa469 689 unsigned int flags = OBJECT_INFO_QUICK;
745f7a8c 690
024aa469
TI
691 if (use_oidset &&
692 !oidset_contains(&loose_oid_set, &ref->old_oid)) {
693 /*
694 * I know this does not exist in the loose form,
695 * so check if it exists in a non-loose form.
696 */
697 flags |= OBJECT_INFO_IGNORE_LOOSE;
698 }
012a1bb5 699
024aa469
TI
700 if (!has_object_file_with_flags(&ref->old_oid, flags))
701 continue;
109cd76d 702 o = parse_object(the_repository, &ref->old_oid);
745f7a8c
NTND
703 if (!o)
704 continue;
705
706 /* We already have it -- which may mean that we were
707 * in sync with the other side at some time after
708 * that (it is OK if we guess wrong here).
709 */
710 if (o->type == OBJ_COMMIT) {
711 struct commit *commit = (struct commit *)o;
712 if (!cutoff || cutoff < commit->date)
713 cutoff = commit->date;
714 }
715 }
716
024aa469
TI
717 oidset_clear(&loose_oid_set);
718
12f19a98
JT
719 if (!args->deepen) {
720 for_each_ref(mark_complete_oid, NULL);
721 for_each_cached_alternate(NULL, mark_alternate_complete);
722 commit_list_sort_by_date(&complete);
723 if (cutoff)
724 mark_recent_complete_commits(args, cutoff);
725 }
745f7a8c 726
12f19a98
JT
727 /*
728 * Mark all complete remote refs as common refs.
729 * Don't mark them common yet; the server has to be told so first.
730 */
731 for (ref = *refs; ref; ref = ref->next) {
732 struct object *o = deref_tag(the_repository,
733 lookup_object(the_repository,
734 ref->old_oid.hash),
735 NULL, 0);
745f7a8c 736
12f19a98
JT
737 if (!o || o->type != OBJ_COMMIT || !(o->flags & COMPLETE))
738 continue;
745f7a8c 739
12f19a98
JT
740 negotiator->known_common(negotiator,
741 (struct commit *)o);
745f7a8c
NTND
742 }
743
34c29034
JT
744 save_commit_buffer = old_save_commit_buffer;
745}
746
747/*
748 * Returns 1 if every object pointed to by the given remote refs is available
749 * locally and reachable from a local ref, and 0 otherwise.
750 */
751static int everything_local(struct fetch_pack_args *args,
752 struct ref **refs)
753{
754 struct ref *ref;
755 int retval;
745f7a8c
NTND
756
757 for (retval = 1, ref = *refs; ref ; ref = ref->next) {
1b283377 758 const struct object_id *remote = &ref->old_oid;
745f7a8c
NTND
759 struct object *o;
760
5abddd1e 761 o = lookup_object(the_repository, remote->hash);
745f7a8c
NTND
762 if (!o || !(o->flags & COMPLETE)) {
763 retval = 0;
1b283377 764 print_verbose(args, "want %s (%s)", oid_to_hex(remote),
0d789a5b 765 ref->name);
745f7a8c
NTND
766 continue;
767 }
1b283377 768 print_verbose(args, _("already have %s (%s)"), oid_to_hex(remote),
0d789a5b 769 ref->name);
745f7a8c 770 }
a1c6d7c1 771
745f7a8c
NTND
772 return retval;
773}
774
775static int sideband_demux(int in, int out, void *data)
776{
777 int *xd = data;
9ff18faf 778 int ret;
745f7a8c 779
9ff18faf 780 ret = recv_sideband("fetch-pack", xd[0], out);
745f7a8c
NTND
781 close(out);
782 return ret;
783}
784
785static int get_pack(struct fetch_pack_args *args,
786 int xd[2], char **pack_lockfile)
787{
788 struct async demux;
745f7a8c 789 int do_keep = args->keep_pack;
984a43b9
JK
790 const char *cmd_name;
791 struct pack_header header;
792 int pass_header = 0;
d3180279 793 struct child_process cmd = CHILD_PROCESS_INIT;
c6807a40 794 int ret;
745f7a8c
NTND
795
796 memset(&demux, 0, sizeof(demux));
797 if (use_sideband) {
798 /* xd[] is talking with upload-pack; subprocess reads from
799 * xd[0], spits out band#2 to stderr, and feeds us band#1
800 * through demux->out.
801 */
802 demux.proc = sideband_demux;
803 demux.data = xd;
804 demux.out = -1;
df857572 805 demux.isolate_sigpipe = 1;
745f7a8c 806 if (start_async(&demux))
1dd73e20 807 die(_("fetch-pack: unable to fork off sideband demultiplexer"));
745f7a8c
NTND
808 }
809 else
810 demux.out = xd[0];
811
745f7a8c 812 if (!args->keep_pack && unpack_limit) {
745f7a8c
NTND
813
814 if (read_pack_header(demux.out, &header))
1dd73e20 815 die(_("protocol error: bad pack header"));
984a43b9 816 pass_header = 1;
745f7a8c
NTND
817 if (ntohl(header.hdr_entries) < unpack_limit)
818 do_keep = 0;
819 else
820 do_keep = 1;
821 }
822
6035d6aa 823 if (alternate_shallow_file) {
984a43b9
JK
824 argv_array_push(&cmd.args, "--shallow-file");
825 argv_array_push(&cmd.args, alternate_shallow_file);
6035d6aa
NTND
826 }
827
88e2f9ed 828 if (do_keep || args->from_promisor) {
745f7a8c
NTND
829 if (pack_lockfile)
830 cmd.out = -1;
984a43b9
JK
831 cmd_name = "index-pack";
832 argv_array_push(&cmd.args, cmd_name);
833 argv_array_push(&cmd.args, "--stdin");
745f7a8c 834 if (!args->quiet && !args->no_progress)
984a43b9 835 argv_array_push(&cmd.args, "-v");
745f7a8c 836 if (args->use_thin_pack)
984a43b9 837 argv_array_push(&cmd.args, "--fix-thin");
88e2f9ed 838 if (do_keep && (args->lock_pack || unpack_limit)) {
da25bdb7 839 char hostname[HOST_NAME_MAX + 1];
5781a9a2 840 if (xgethostname(hostname, sizeof(hostname)))
984a43b9
JK
841 xsnprintf(hostname, sizeof(hostname), "localhost");
842 argv_array_pushf(&cmd.args,
843 "--keep=fetch-pack %"PRIuMAX " on %s",
844 (uintmax_t)getpid(), hostname);
745f7a8c 845 }
c6807a40 846 if (args->check_self_contained_and_connected)
984a43b9 847 argv_array_push(&cmd.args, "--check-self-contained-and-connected");
88e2f9ed
JT
848 if (args->from_promisor)
849 argv_array_push(&cmd.args, "--promisor");
745f7a8c
NTND
850 }
851 else {
984a43b9
JK
852 cmd_name = "unpack-objects";
853 argv_array_push(&cmd.args, cmd_name);
745f7a8c 854 if (args->quiet || args->no_progress)
984a43b9 855 argv_array_push(&cmd.args, "-q");
c6807a40 856 args->check_self_contained_and_connected = 0;
745f7a8c 857 }
984a43b9
JK
858
859 if (pass_header)
860 argv_array_pushf(&cmd.args, "--pack_header=%"PRIu32",%"PRIu32,
861 ntohl(header.hdr_version),
862 ntohl(header.hdr_entries));
745f7a8c
NTND
863 if (fetch_fsck_objects >= 0
864 ? fetch_fsck_objects
865 : transfer_fsck_objects >= 0
866 ? transfer_fsck_objects
98a2ea46
JT
867 : 0) {
868 if (args->from_promisor)
869 /*
870 * We cannot use --strict in index-pack because it
871 * checks both broken objects and links, but we only
872 * want to check for broken objects.
873 */
874 argv_array_push(&cmd.args, "--fsck-objects");
875 else
1362df0d
ÆAB
876 argv_array_pushf(&cmd.args, "--strict%s",
877 fsck_msg_types.buf);
98a2ea46 878 }
745f7a8c
NTND
879
880 cmd.in = demux.out;
881 cmd.git_cmd = 1;
882 if (start_command(&cmd))
1dd73e20 883 die(_("fetch-pack: unable to fork off %s"), cmd_name);
745f7a8c
NTND
884 if (do_keep && pack_lockfile) {
885 *pack_lockfile = index_pack_lockfile(cmd.out);
886 close(cmd.out);
887 }
888
37cb1dd6
JL
889 if (!use_sideband)
890 /* Closed by start_command() */
891 xd[0] = -1;
892
c6807a40
NTND
893 ret = finish_command(&cmd);
894 if (!ret || (args->check_self_contained_and_connected && ret == 1))
895 args->self_contained_and_connected =
896 args->check_self_contained_and_connected &&
897 ret == 0;
898 else
1dd73e20 899 die(_("%s failed"), cmd_name);
745f7a8c 900 if (use_sideband && finish_async(&demux))
1dd73e20 901 die(_("error in sideband demultiplexer"));
745f7a8c
NTND
902 return 0;
903}
904
f2db854d
JH
905static int cmp_ref_by_name(const void *a_, const void *b_)
906{
907 const struct ref *a = *((const struct ref **)a_);
908 const struct ref *b = *((const struct ref **)b_);
909 return strcmp(a->name, b->name);
910}
911
745f7a8c
NTND
912static struct ref *do_fetch_pack(struct fetch_pack_args *args,
913 int fd[2],
914 const struct ref *orig_ref,
f2db854d 915 struct ref **sought, int nr_sought,
beea4152 916 struct shallow_info *si,
745f7a8c
NTND
917 char **pack_lockfile)
918{
919 struct ref *ref = copy_ref_list(orig_ref);
1b283377 920 struct object_id oid;
745f7a8c
NTND
921 const char *agent_feature;
922 int agent_len;
ec062838 923 struct fetch_negotiator negotiator;
42cc7485 924 fetch_negotiator_init(&negotiator, negotiation_algorithm);
745f7a8c
NTND
925
926 sort_ref_list(&ref, ref_compare_name);
9ed0d8d6 927 QSORT(sought, nr_sought, cmp_ref_by_name);
745f7a8c 928
c8813487 929 if ((args->depth > 0 || is_repository_shallow(the_repository)) && !server_supports("shallow"))
1dd73e20 930 die(_("Server does not support shallow clients"));
a45a2600 931 if (args->depth > 0 || args->deepen_since || args->deepen_not)
79891cb9 932 args->deepen = 1;
745f7a8c 933 if (server_supports("multi_ack_detailed")) {
1dd73e20 934 print_verbose(args, _("Server supports multi_ack_detailed"));
745f7a8c
NTND
935 multi_ack = 2;
936 if (server_supports("no-done")) {
1dd73e20 937 print_verbose(args, _("Server supports no-done"));
745f7a8c
NTND
938 if (args->stateless_rpc)
939 no_done = 1;
940 }
941 }
942 else if (server_supports("multi_ack")) {
1dd73e20 943 print_verbose(args, _("Server supports multi_ack"));
745f7a8c
NTND
944 multi_ack = 1;
945 }
946 if (server_supports("side-band-64k")) {
1dd73e20 947 print_verbose(args, _("Server supports side-band-64k"));
745f7a8c
NTND
948 use_sideband = 2;
949 }
950 else if (server_supports("side-band")) {
1dd73e20 951 print_verbose(args, _("Server supports side-band"));
745f7a8c
NTND
952 use_sideband = 1;
953 }
6e7b66ee 954 if (server_supports("allow-tip-sha1-in-want")) {
1dd73e20 955 print_verbose(args, _("Server supports allow-tip-sha1-in-want"));
7199c093 956 allow_unadvertised_object_request |= ALLOW_TIP_SHA1;
6e7b66ee 957 }
68ee6289 958 if (server_supports("allow-reachable-sha1-in-want")) {
1dd73e20 959 print_verbose(args, _("Server supports allow-reachable-sha1-in-want"));
68ee6289
FM
960 allow_unadvertised_object_request |= ALLOW_REACHABLE_SHA1;
961 }
745f7a8c
NTND
962 if (!server_supports("thin-pack"))
963 args->use_thin_pack = 0;
964 if (!server_supports("no-progress"))
965 args->no_progress = 0;
966 if (!server_supports("include-tag"))
967 args->include_tag = 0;
0d789a5b 968 if (server_supports("ofs-delta"))
1dd73e20 969 print_verbose(args, _("Server supports ofs-delta"));
0d789a5b 970 else
745f7a8c
NTND
971 prefer_ofs_delta = 0;
972
640d8b72
JH
973 if (server_supports("filter")) {
974 server_supports_filtering = 1;
975 print_verbose(args, _("Server supports filter"));
976 } else if (args->filter_options.choice) {
977 warning("filtering not recognized by server, ignoring");
978 }
979
745f7a8c
NTND
980 if ((agent_feature = server_feature_value("agent", &agent_len))) {
981 agent_supported = 1;
0d789a5b 982 if (agent_len)
1dd73e20 983 print_verbose(args, _("Server version is %.*s"),
0d789a5b 984 agent_len, agent_feature);
745f7a8c 985 }
508ea882
NTND
986 if (server_supports("deepen-since"))
987 deepen_since_ok = 1;
988 else if (args->deepen_since)
989 die(_("Server does not support --shallow-since"));
a45a2600
NTND
990 if (server_supports("deepen-not"))
991 deepen_not_ok = 1;
992 else if (args->deepen_not)
993 die(_("Server does not support --shallow-exclude"));
cccf74e2
NTND
994 if (!server_supports("deepen-relative") && args->deepen_relative)
995 die(_("Server does not support --deepen"));
745f7a8c 996
12f19a98
JT
997 if (!args->no_dependents) {
998 mark_complete_and_common_ref(&negotiator, args, &ref);
999 filter_refs(args, &ref, sought, nr_sought);
1000 if (everything_local(args, &ref)) {
1001 packet_flush(fd[1]);
1002 goto all_done;
1003 }
1004 } else {
1005 filter_refs(args, &ref, sought, nr_sought);
745f7a8c 1006 }
ec062838 1007 if (find_common(&negotiator, args, fd, &oid, ref) < 0)
745f7a8c
NTND
1008 if (!args->keep_pack)
1009 /* When cloning, it is not unusual to have
1010 * no common commit.
1011 */
1dd73e20 1012 warning(_("no common commits"));
745f7a8c
NTND
1013
1014 if (args->stateless_rpc)
1015 packet_flush(fd[1]);
79891cb9 1016 if (args->deepen)
1a30f5a2
NTND
1017 setup_alternate_shallow(&shallow_lock, &alternate_shallow_file,
1018 NULL);
4820a33b 1019 else if (si->nr_ours || si->nr_theirs)
beea4152 1020 alternate_shallow_file = setup_temporary_shallow(si->shallow);
6da8bdcb
NTND
1021 else
1022 alternate_shallow_file = NULL;
745f7a8c 1023 if (get_pack(args, fd, pack_lockfile))
1dd73e20 1024 die(_("git fetch-pack: fetch failed."));
745f7a8c
NTND
1025
1026 all_done:
ec062838 1027 negotiator.release(&negotiator);
745f7a8c
NTND
1028 return ref;
1029}
1030
f7e20501
BW
1031static void add_shallow_requests(struct strbuf *req_buf,
1032 const struct fetch_pack_args *args)
1033{
00624d60 1034 if (is_repository_shallow(the_repository))
f7e20501
BW
1035 write_shallow_commits(req_buf, 1, NULL);
1036 if (args->depth > 0)
1037 packet_buf_write(req_buf, "deepen %d", args->depth);
1038 if (args->deepen_since) {
1039 timestamp_t max_age = approxidate(args->deepen_since);
1040 packet_buf_write(req_buf, "deepen-since %"PRItime, max_age);
1041 }
1042 if (args->deepen_not) {
1043 int i;
1044 for (i = 0; i < args->deepen_not->nr; i++) {
1045 struct string_list_item *s = args->deepen_not->items + i;
1046 packet_buf_write(req_buf, "deepen-not %s", s->string);
1047 }
1048 }
1049}
1050
12f19a98 1051static void add_wants(int no_dependents, const struct ref *wants, struct strbuf *req_buf)
685fbd32 1052{
73302051
BW
1053 int use_ref_in_want = server_supports_feature("fetch", "ref-in-want", 0);
1054
685fbd32
BW
1055 for ( ; wants ; wants = wants->next) {
1056 const struct object_id *remote = &wants->old_oid;
685fbd32
BW
1057 struct object *o;
1058
1059 /*
1060 * If that object is complete (i.e. it is an ancestor of a
1061 * local ref), we tell them we have it but do not have to
1062 * tell them about its ancestors, which they already know
1063 * about.
1064 *
1065 * We use lookup_object here because we are only
1066 * interested in the case we *know* the object is
1067 * reachable and we have already scanned it.
12f19a98
JT
1068 *
1069 * Do this only if args->no_dependents is false (if it is true,
1070 * we cannot trust the object flags).
685fbd32 1071 */
12f19a98
JT
1072 if (!no_dependents &&
1073 ((o = lookup_object(the_repository, remote->hash)) != NULL) &&
685fbd32
BW
1074 (o->flags & COMPLETE)) {
1075 continue;
1076 }
1077
73302051
BW
1078 if (!use_ref_in_want || wants->exact_oid)
1079 packet_buf_write(req_buf, "want %s\n", oid_to_hex(remote));
1080 else
1081 packet_buf_write(req_buf, "want-ref %s\n", wants->name);
685fbd32
BW
1082 }
1083}
1084
1085static void add_common(struct strbuf *req_buf, struct oidset *common)
1086{
1087 struct oidset_iter iter;
1088 const struct object_id *oid;
1089 oidset_iter_init(common, &iter);
1090
1091 while ((oid = oidset_iter_next(&iter))) {
1092 packet_buf_write(req_buf, "have %s\n", oid_to_hex(oid));
1093 }
1094}
1095
ec062838
JT
1096static int add_haves(struct fetch_negotiator *negotiator,
1097 struct strbuf *req_buf,
d30fe89c 1098 int *haves_to_send, int *in_vain)
685fbd32
BW
1099{
1100 int ret = 0;
1101 int haves_added = 0;
1102 const struct object_id *oid;
1103
ec062838 1104 while ((oid = negotiator->next(negotiator))) {
685fbd32
BW
1105 packet_buf_write(req_buf, "have %s\n", oid_to_hex(oid));
1106 if (++haves_added >= *haves_to_send)
1107 break;
1108 }
1109
1110 *in_vain += haves_added;
1111 if (!haves_added || *in_vain >= MAX_IN_VAIN) {
1112 /* Send Done */
1113 packet_buf_write(req_buf, "done\n");
1114 ret = 1;
1115 }
1116
1117 /* Increase haves to send on next round */
1118 *haves_to_send = next_flush(1, *haves_to_send);
1119
1120 return ret;
1121}
1122
ec062838 1123static int send_fetch_request(struct fetch_negotiator *negotiator, int fd_out,
d30fe89c 1124 const struct fetch_pack_args *args,
685fbd32
BW
1125 const struct ref *wants, struct oidset *common,
1126 int *haves_to_send, int *in_vain)
1127{
1128 int ret = 0;
1129 struct strbuf req_buf = STRBUF_INIT;
1130
1131 if (server_supports_v2("fetch", 1))
1132 packet_buf_write(&req_buf, "command=fetch");
1133 if (server_supports_v2("agent", 0))
1134 packet_buf_write(&req_buf, "agent=%s", git_user_agent_sanitized());
5e3548ef
BW
1135 if (args->server_options && args->server_options->nr &&
1136 server_supports_v2("server-option", 1)) {
1137 int i;
1138 for (i = 0; i < args->server_options->nr; i++)
1139 packet_write_fmt(fd_out, "server-option=%s",
1140 args->server_options->items[i].string);
1141 }
685fbd32
BW
1142
1143 packet_buf_delim(&req_buf);
1144 if (args->use_thin_pack)
1145 packet_buf_write(&req_buf, "thin-pack");
1146 if (args->no_progress)
1147 packet_buf_write(&req_buf, "no-progress");
1148 if (args->include_tag)
1149 packet_buf_write(&req_buf, "include-tag");
1150 if (prefer_ofs_delta)
1151 packet_buf_write(&req_buf, "ofs-delta");
1152
f7e20501
BW
1153 /* Add shallow-info and deepen request */
1154 if (server_supports_feature("fetch", "shallow", 0))
1155 add_shallow_requests(&req_buf, args);
00624d60 1156 else if (is_repository_shallow(the_repository) || args->deepen)
f7e20501
BW
1157 die(_("Server does not support shallow requests"));
1158
ba95710a
JT
1159 /* Add filter */
1160 if (server_supports_feature("fetch", "filter", 0) &&
1161 args->filter_options.choice) {
1162 print_verbose(args, _("Server supports filter"));
1163 packet_buf_write(&req_buf, "filter %s",
1164 args->filter_options.filter_spec);
1165 } else if (args->filter_options.choice) {
1166 warning("filtering not recognized by server, ignoring");
1167 }
1168
685fbd32 1169 /* add wants */
12f19a98 1170 add_wants(args->no_dependents, wants, &req_buf);
685fbd32 1171
ba95710a
JT
1172 if (args->no_dependents) {
1173 packet_buf_write(&req_buf, "done");
1174 ret = 1;
1175 } else {
1176 /* Add all of the common commits we've found in previous rounds */
1177 add_common(&req_buf, common);
685fbd32 1178
ba95710a 1179 /* Add initial haves */
ec062838 1180 ret = add_haves(negotiator, &req_buf, haves_to_send, in_vain);
ba95710a 1181 }
685fbd32
BW
1182
1183 /* Send request */
1184 packet_buf_flush(&req_buf);
1185 write_or_die(fd_out, req_buf.buf, req_buf.len);
1186
1187 strbuf_release(&req_buf);
1188 return ret;
1189}
1190
1191/*
1192 * Processes a section header in a server's response and checks if it matches
1193 * `section`. If the value of `peek` is 1, the header line will be peeked (and
1194 * not consumed); if 0, the line will be consumed and the function will die if
1195 * the section header doesn't match what was expected.
1196 */
1197static int process_section_header(struct packet_reader *reader,
1198 const char *section, int peek)
1199{
1200 int ret;
1201
1202 if (packet_reader_peek(reader) != PACKET_READ_NORMAL)
bbb19a8b 1203 die(_("error reading section header '%s'"), section);
685fbd32
BW
1204
1205 ret = !strcmp(reader->line, section);
1206
1207 if (!peek) {
1208 if (!ret)
bbb19a8b 1209 die(_("expected '%s', received '%s'"),
685fbd32
BW
1210 section, reader->line);
1211 packet_reader_read(reader);
1212 }
1213
1214 return ret;
1215}
1216
ec062838 1217static int process_acks(struct fetch_negotiator *negotiator,
d30fe89c
JT
1218 struct packet_reader *reader,
1219 struct oidset *common)
685fbd32
BW
1220{
1221 /* received */
1222 int received_ready = 0;
1223 int received_ack = 0;
1224
1225 process_section_header(reader, "acknowledgments", 0);
1226 while (packet_reader_read(reader) == PACKET_READ_NORMAL) {
1227 const char *arg;
1228
1229 if (!strcmp(reader->line, "NAK"))
1230 continue;
1231
1232 if (skip_prefix(reader->line, "ACK ", &arg)) {
1233 struct object_id oid;
1234 if (!get_oid_hex(arg, &oid)) {
1235 struct commit *commit;
1236 oidset_insert(common, &oid);
c1f5eb49 1237 commit = lookup_commit(the_repository, &oid);
ec062838 1238 negotiator->ack(negotiator, commit);
685fbd32
BW
1239 }
1240 continue;
1241 }
1242
1243 if (!strcmp(reader->line, "ready")) {
685fbd32
BW
1244 received_ready = 1;
1245 continue;
1246 }
1247
bbb19a8b 1248 die(_("unexpected acknowledgment line: '%s'"), reader->line);
685fbd32
BW
1249 }
1250
1251 if (reader->status != PACKET_READ_FLUSH &&
1252 reader->status != PACKET_READ_DELIM)
bbb19a8b 1253 die(_("error processing acks: %d"), reader->status);
685fbd32
BW
1254
1255 /* return 0 if no common, 1 if there are common, or 2 if ready */
1256 return received_ready ? 2 : (received_ack ? 1 : 0);
1257}
1258
f7e20501
BW
1259static void receive_shallow_info(struct fetch_pack_args *args,
1260 struct packet_reader *reader)
1261{
1262 process_section_header(reader, "shallow-info", 0);
1263 while (packet_reader_read(reader) == PACKET_READ_NORMAL) {
1264 const char *arg;
1265 struct object_id oid;
1266
1267 if (skip_prefix(reader->line, "shallow ", &arg)) {
1268 if (get_oid_hex(arg, &oid))
1269 die(_("invalid shallow line: %s"), reader->line);
00624d60 1270 register_shallow(the_repository, &oid);
f7e20501
BW
1271 continue;
1272 }
1273 if (skip_prefix(reader->line, "unshallow ", &arg)) {
1274 if (get_oid_hex(arg, &oid))
1275 die(_("invalid unshallow line: %s"), reader->line);
5abddd1e 1276 if (!lookup_object(the_repository, oid.hash))
f7e20501
BW
1277 die(_("object not found: %s"), reader->line);
1278 /* make sure that it is parsed as shallow */
109cd76d 1279 if (!parse_object(the_repository, &oid))
f7e20501
BW
1280 die(_("error in object: %s"), reader->line);
1281 if (unregister_shallow(&oid))
1282 die(_("no shallow found: %s"), reader->line);
1283 continue;
1284 }
1285 die(_("expected shallow/unshallow, got %s"), reader->line);
1286 }
1287
1288 if (reader->status != PACKET_READ_FLUSH &&
1289 reader->status != PACKET_READ_DELIM)
bbb19a8b 1290 die(_("error processing shallow info: %d"), reader->status);
f7e20501
BW
1291
1292 setup_alternate_shallow(&shallow_lock, &alternate_shallow_file, NULL);
1293 args->deepen = 1;
1294}
1295
e2842b39
JT
1296static void receive_wanted_refs(struct packet_reader *reader,
1297 struct ref **sought, int nr_sought)
73302051
BW
1298{
1299 process_section_header(reader, "wanted-refs", 0);
1300 while (packet_reader_read(reader) == PACKET_READ_NORMAL) {
1301 struct object_id oid;
1302 const char *end;
e2842b39 1303 int i;
73302051
BW
1304
1305 if (parse_oid_hex(reader->line, &oid, &end) || *end++ != ' ')
bbb19a8b 1306 die(_("expected wanted-ref, got '%s'"), reader->line);
73302051 1307
e2842b39
JT
1308 for (i = 0; i < nr_sought; i++) {
1309 if (!strcmp(end, sought[i]->name)) {
1310 oidcpy(&sought[i]->old_oid, &oid);
73302051
BW
1311 break;
1312 }
1313 }
1314
e2842b39 1315 if (i == nr_sought)
bbb19a8b 1316 die(_("unexpected wanted-ref: '%s'"), reader->line);
73302051
BW
1317 }
1318
1319 if (reader->status != PACKET_READ_DELIM)
bbb19a8b 1320 die(_("error processing wanted refs: %d"), reader->status);
73302051
BW
1321}
1322
685fbd32
BW
1323enum fetch_state {
1324 FETCH_CHECK_LOCAL = 0,
1325 FETCH_SEND_REQUEST,
1326 FETCH_PROCESS_ACKS,
1327 FETCH_GET_PACK,
1328 FETCH_DONE,
1329};
1330
1331static struct ref *do_fetch_pack_v2(struct fetch_pack_args *args,
1332 int fd[2],
1333 const struct ref *orig_ref,
1334 struct ref **sought, int nr_sought,
1335 char **pack_lockfile)
1336{
1337 struct ref *ref = copy_ref_list(orig_ref);
1338 enum fetch_state state = FETCH_CHECK_LOCAL;
1339 struct oidset common = OIDSET_INIT;
1340 struct packet_reader reader;
1341 int in_vain = 0;
1342 int haves_to_send = INITIAL_FLUSH;
ec062838 1343 struct fetch_negotiator negotiator;
42cc7485 1344 fetch_negotiator_init(&negotiator, negotiation_algorithm);
685fbd32
BW
1345 packet_reader_init(&reader, fd[0], NULL, 0,
1346 PACKET_READ_CHOMP_NEWLINE);
1347
1348 while (state != FETCH_DONE) {
1349 switch (state) {
1350 case FETCH_CHECK_LOCAL:
1351 sort_ref_list(&ref, ref_compare_name);
1352 QSORT(sought, nr_sought, cmp_ref_by_name);
1353
1354 /* v2 supports these by default */
1355 allow_unadvertised_object_request |= ALLOW_REACHABLE_SHA1;
1356 use_sideband = 2;
f7e20501
BW
1357 if (args->depth > 0 || args->deepen_since || args->deepen_not)
1358 args->deepen = 1;
685fbd32 1359
685fbd32 1360 /* Filter 'ref' by 'sought' and those that aren't local */
12f19a98
JT
1361 if (!args->no_dependents) {
1362 mark_complete_and_common_ref(&negotiator, args, &ref);
1363 filter_refs(args, &ref, sought, nr_sought);
1364 if (everything_local(args, &ref))
1365 state = FETCH_DONE;
1366 else
1367 state = FETCH_SEND_REQUEST;
1368
1369 mark_tips(&negotiator, args->negotiation_tips);
1370 for_each_cached_alternate(&negotiator,
1371 insert_one_alternate_object);
1372 } else {
1373 filter_refs(args, &ref, sought, nr_sought);
685fbd32 1374 state = FETCH_SEND_REQUEST;
12f19a98 1375 }
685fbd32
BW
1376 break;
1377 case FETCH_SEND_REQUEST:
ec062838
JT
1378 if (send_fetch_request(&negotiator, fd[1], args, ref,
1379 &common,
685fbd32
BW
1380 &haves_to_send, &in_vain))
1381 state = FETCH_GET_PACK;
1382 else
1383 state = FETCH_PROCESS_ACKS;
1384 break;
1385 case FETCH_PROCESS_ACKS:
1386 /* Process ACKs/NAKs */
ec062838 1387 switch (process_acks(&negotiator, &reader, &common)) {
685fbd32
BW
1388 case 2:
1389 state = FETCH_GET_PACK;
1390 break;
1391 case 1:
1392 in_vain = 0;
1393 /* fallthrough */
1394 default:
1395 state = FETCH_SEND_REQUEST;
1396 break;
1397 }
1398 break;
1399 case FETCH_GET_PACK:
f7e20501
BW
1400 /* Check for shallow-info section */
1401 if (process_section_header(&reader, "shallow-info", 1))
1402 receive_shallow_info(args, &reader);
1403
73302051 1404 if (process_section_header(&reader, "wanted-refs", 1))
e2842b39 1405 receive_wanted_refs(&reader, sought, nr_sought);
73302051 1406
685fbd32
BW
1407 /* get the pack */
1408 process_section_header(&reader, "packfile", 0);
1409 if (get_pack(args, fd, pack_lockfile))
1410 die(_("git fetch-pack: fetch failed."));
1411
1412 state = FETCH_DONE;
1413 break;
1414 case FETCH_DONE:
1415 continue;
1416 }
1417 }
1418
ec062838 1419 negotiator.release(&negotiator);
685fbd32
BW
1420 oidset_clear(&common);
1421 return ref;
1422}
1423
1362df0d
ÆAB
1424static int fetch_pack_config_cb(const char *var, const char *value, void *cb)
1425{
1426 if (strcmp(var, "fetch.fsck.skiplist") == 0) {
1427 const char *path;
1428
1429 if (git_config_pathname(&path, var, value))
1430 return 1;
1431 strbuf_addf(&fsck_msg_types, "%cskiplist=%s",
1432 fsck_msg_types.len ? ',' : '=', path);
1433 free((char *)path);
1434 return 0;
1435 }
1436
1437 if (skip_prefix(var, "fetch.fsck.", &var)) {
1438 if (is_valid_msg_type(var, value))
1439 strbuf_addf(&fsck_msg_types, "%c%s=%s",
1440 fsck_msg_types.len ? ',' : '=', var, value);
1441 else
1442 warning("Skipping unknown msg id '%s'", var);
1443 return 0;
1444 }
1445
1446 return git_default_config(var, value, cb);
1447}
1448
f44af51d 1449static void fetch_pack_config(void)
745f7a8c 1450{
f44af51d
TA
1451 git_config_get_int("fetch.unpacklimit", &fetch_unpack_limit);
1452 git_config_get_int("transfer.unpacklimit", &transfer_unpack_limit);
1453 git_config_get_bool("repack.usedeltabaseoffset", &prefer_ofs_delta);
1454 git_config_get_bool("fetch.fsckobjects", &fetch_fsck_objects);
1455 git_config_get_bool("transfer.fsckobjects", &transfer_fsck_objects);
42cc7485
JT
1456 git_config_get_string("fetch.negotiationalgorithm",
1457 &negotiation_algorithm);
745f7a8c 1458
1362df0d 1459 git_config(fetch_pack_config_cb, NULL);
745f7a8c
NTND
1460}
1461
745f7a8c
NTND
1462static void fetch_pack_setup(void)
1463{
1464 static int did_setup;
1465 if (did_setup)
1466 return;
f44af51d 1467 fetch_pack_config();
745f7a8c
NTND
1468 if (0 <= transfer_unpack_limit)
1469 unpack_limit = transfer_unpack_limit;
1470 else if (0 <= fetch_unpack_limit)
1471 unpack_limit = fetch_unpack_limit;
1472 did_setup = 1;
1473}
1474
f2db854d
JH
1475static int remove_duplicates_in_refs(struct ref **ref, int nr)
1476{
1477 struct string_list names = STRING_LIST_INIT_NODUP;
1478 int src, dst;
1479
1480 for (src = dst = 0; src < nr; src++) {
1481 struct string_list_item *item;
1482 item = string_list_insert(&names, ref[src]->name);
1483 if (item->util)
1484 continue; /* already have it */
1485 item->util = ref[src];
1486 if (src != dst)
1487 ref[dst] = ref[src];
1488 dst++;
1489 }
1490 for (src = dst; src < nr; src++)
1491 ref[src] = NULL;
1492 string_list_clear(&names, 0);
1493 return dst;
1494}
1495
beea4152 1496static void update_shallow(struct fetch_pack_args *args,
e2842b39 1497 struct ref **sought, int nr_sought,
beea4152 1498 struct shallow_info *si)
a796ccee 1499{
910650d2 1500 struct oid_array ref = OID_ARRAY_INIT;
4820a33b 1501 int *status;
beea4152
NTND
1502 int i;
1503
79891cb9 1504 if (args->deepen && alternate_shallow_file) {
a796ccee 1505 if (*alternate_shallow_file == '\0') { /* --unshallow */
102de880 1506 unlink_or_warn(git_path_shallow(the_repository));
a796ccee
NTND
1507 rollback_lock_file(&shallow_lock);
1508 } else
1509 commit_lock_file(&shallow_lock);
1510 return;
1511 }
beea4152
NTND
1512
1513 if (!si->shallow || !si->shallow->nr)
1514 return;
1515
beea4152
NTND
1516 if (args->cloning) {
1517 /*
1518 * remote is shallow, but this is a clone, there are
1519 * no objects in repo to worry about. Accept any
1520 * shallow points that exist in the pack (iow in repo
1521 * after get_pack() and reprepare_packed_git())
1522 */
910650d2 1523 struct oid_array extra = OID_ARRAY_INIT;
ee3051bd 1524 struct object_id *oid = si->shallow->oid;
beea4152 1525 for (i = 0; i < si->shallow->nr; i++)
ee3051bd 1526 if (has_object_file(&oid[i]))
910650d2 1527 oid_array_append(&extra, &oid[i]);
beea4152
NTND
1528 if (extra.nr) {
1529 setup_alternate_shallow(&shallow_lock,
1530 &alternate_shallow_file,
1531 &extra);
1532 commit_lock_file(&shallow_lock);
1533 }
910650d2 1534 oid_array_clear(&extra);
beea4152
NTND
1535 return;
1536 }
4820a33b
NTND
1537
1538 if (!si->nr_ours && !si->nr_theirs)
1539 return;
1540
1541 remove_nonexistent_theirs_shallow(si);
4820a33b
NTND
1542 if (!si->nr_ours && !si->nr_theirs)
1543 return;
e2842b39
JT
1544 for (i = 0; i < nr_sought; i++)
1545 oid_array_append(&ref, &sought[i]->old_oid);
4820a33b
NTND
1546 si->ref = &ref;
1547
48d25cae
NTND
1548 if (args->update_shallow) {
1549 /*
1550 * remote is also shallow, .git/shallow may be updated
1551 * so all refs can be accepted. Make sure we only add
1552 * shallow roots that are actually reachable from new
1553 * refs.
1554 */
910650d2 1555 struct oid_array extra = OID_ARRAY_INIT;
ee3051bd 1556 struct object_id *oid = si->shallow->oid;
48d25cae
NTND
1557 assign_shallow_commits_to_refs(si, NULL, NULL);
1558 if (!si->nr_ours && !si->nr_theirs) {
910650d2 1559 oid_array_clear(&ref);
48d25cae
NTND
1560 return;
1561 }
1562 for (i = 0; i < si->nr_ours; i++)
910650d2 1563 oid_array_append(&extra, &oid[si->ours[i]]);
48d25cae 1564 for (i = 0; i < si->nr_theirs; i++)
910650d2 1565 oid_array_append(&extra, &oid[si->theirs[i]]);
48d25cae
NTND
1566 setup_alternate_shallow(&shallow_lock,
1567 &alternate_shallow_file,
1568 &extra);
1569 commit_lock_file(&shallow_lock);
910650d2 1570 oid_array_clear(&extra);
1571 oid_array_clear(&ref);
48d25cae
NTND
1572 return;
1573 }
1574
4820a33b
NTND
1575 /*
1576 * remote is also shallow, check what ref is safe to update
1577 * without updating .git/shallow
1578 */
e2842b39 1579 status = xcalloc(nr_sought, sizeof(*status));
4820a33b
NTND
1580 assign_shallow_commits_to_refs(si, NULL, status);
1581 if (si->nr_ours || si->nr_theirs) {
e2842b39 1582 for (i = 0; i < nr_sought; i++)
4820a33b 1583 if (status[i])
e2842b39 1584 sought[i]->status = REF_STATUS_REJECT_SHALLOW;
4820a33b
NTND
1585 }
1586 free(status);
910650d2 1587 oid_array_clear(&ref);
a796ccee
NTND
1588}
1589
cf1e7c07
JT
1590static int iterate_ref_map(void *cb_data, struct object_id *oid)
1591{
1592 struct ref **rm = cb_data;
1593 struct ref *ref = *rm;
1594
1595 if (!ref)
1596 return -1; /* end of the list */
1597 *rm = ref->next;
1598 oidcpy(oid, &ref->old_oid);
1599 return 0;
1600}
1601
745f7a8c
NTND
1602struct ref *fetch_pack(struct fetch_pack_args *args,
1603 int fd[], struct child_process *conn,
1604 const struct ref *ref,
1605 const char *dest,
f2db854d 1606 struct ref **sought, int nr_sought,
910650d2 1607 struct oid_array *shallow,
685fbd32
BW
1608 char **pack_lockfile,
1609 enum protocol_version version)
745f7a8c 1610{
745f7a8c 1611 struct ref *ref_cpy;
beea4152 1612 struct shallow_info si;
745f7a8c
NTND
1613
1614 fetch_pack_setup();
f2db854d
JH
1615 if (nr_sought)
1616 nr_sought = remove_duplicates_in_refs(sought, nr_sought);
745f7a8c
NTND
1617
1618 if (!ref) {
1619 packet_flush(fd[1]);
1dd73e20 1620 die(_("no matching remote head"));
745f7a8c 1621 }
beea4152 1622 prepare_shallow_info(&si, shallow);
685fbd32
BW
1623 if (version == protocol_v2)
1624 ref_cpy = do_fetch_pack_v2(args, fd, ref, sought, nr_sought,
1625 pack_lockfile);
1626 else
1627 ref_cpy = do_fetch_pack(args, fd, ref, sought, nr_sought,
1628 &si, pack_lockfile);
a49d2834 1629 reprepare_packed_git(the_repository);
cf1e7c07
JT
1630
1631 if (!args->cloning && args->deepen) {
1632 struct check_connected_options opt = CHECK_CONNECTED_INIT;
1633 struct ref *iterator = ref_cpy;
1634 opt.shallow_file = alternate_shallow_file;
1635 if (args->deepen)
1636 opt.is_deepening_fetch = 1;
1637 if (check_connected(iterate_ref_map, &iterator, &opt)) {
1638 error(_("remote did not send all necessary objects"));
1639 free_refs(ref_cpy);
1640 ref_cpy = NULL;
1641 rollback_lock_file(&shallow_lock);
1642 goto cleanup;
1643 }
1644 args->connectivity_checked = 1;
1645 }
1646
e2842b39 1647 update_shallow(args, sought, nr_sought, &si);
cf1e7c07 1648cleanup:
beea4152 1649 clear_shallow_info(&si);
745f7a8c
NTND
1650 return ref_cpy;
1651}
e860d96b
MM
1652
1653int report_unmatched_refs(struct ref **sought, int nr_sought)
1654{
1655 int i, ret = 0;
1656
1657 for (i = 0; i < nr_sought; i++) {
d56583de 1658 if (!sought[i])
e860d96b 1659 continue;
d56583de
MM
1660 switch (sought[i]->match_status) {
1661 case REF_MATCHED:
1662 continue;
1663 case REF_NOT_MATCHED:
1664 error(_("no such remote ref %s"), sought[i]->name);
1665 break;
1666 case REF_UNADVERTISED_NOT_ALLOWED:
1667 error(_("Server does not allow request for unadvertised object %s"),
1668 sought[i]->name);
1669 break;
1670 }
e860d96b
MM
1671 ret = 1;
1672 }
1673 return ret;
1674}