summaryrefslogtreecommitdiff
path: root/fetch-pack.c
blob: b10c4323155b77f2ef271564cef862147a880596 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696
697
698
699
700
701
702
703
704
705
706
707
708
709
710
711
712
713
714
715
716
717
718
719
720
721
722
723
724
725
726
727
728
729
730
731
732
733
734
735
736
737
738
739
740
741
742
743
744
745
746
747
748
749
750
751
752
753
754
755
756
757
758
759
760
761
762
763
764
765
766
767
768
769
770
771
772
773
774
775
776
777
778
779
780
781
782
783
784
785
786
787
788
789
790
791
792
793
794
795
796
797
798
799
800
801
802
803
804
805
806
807
808
809
810
811
812
813
814
815
816
817
818
819
820
821
822
823
824
825
826
827
828
829
830
831
832
833
834
835
836
837
838
839
840
841
842
843
844
845
846
847
848
849
850
851
852
853
854
855
856
857
858
859
860
861
862
863
864
865
866
867
868
869
870
871
872
873
874
875
876
877
878
879
880
881
882
883
884
885
886
887
888
889
890
891
892
893
894
895
896
897
898
899
900
901
902
903
904
905
906
907
908
909
910
911
912
913
914
915
916
917
918
919
920
921
922
923
924
925
926
927
928
929
930
931
932
933
934
935
936
937
938
939
940
941
942
943
944
945
946
947
948
949
950
951
952
953
954
955
956
957
958
959
960
961
962
963
964
965
966
967
968
969
970
971
972
973
974
975
976
977
978
979
980
981
982
983
984
985
986
987
988
989
990
991
992
993
994
995
996
997
998
999
1000
1001
1002
1003
1004
1005
1006
1007
1008
1009
1010
1011
1012
1013
1014
1015
1016
1017
1018
1019
1020
1021
1022
1023
1024
1025
1026
1027
1028
1029
1030
1031
1032
1033
1034
1035
1036
1037
1038
1039
1040
1041
1042
1043
1044
1045
1046
1047
1048
1049
1050
1051
1052
1053
1054
1055
1056
1057
1058
1059
1060
1061
1062
1063
1064
1065
1066
1067
1068
1069
1070
1071
1072
1073
1074
1075
1076
1077
1078
1079
1080
1081
1082
1083
1084
1085
1086
1087
1088
1089
1090
1091
1092
1093
1094
1095
1096
1097
1098
1099
1100
1101
1102
1103
1104
1105
1106
1107
1108
1109
1110
1111
1112
1113
1114
1115
1116
1117
1118
1119
1120
1121
1122
1123
1124
1125
1126
1127
1128
1129
1130
1131
1132
1133
1134
1135
1136
1137
1138
1139
1140
1141
1142
1143
1144
1145
1146
1147
1148
1149
1150
1151
1152
1153
1154
1155
1156
1157
1158
1159
1160
1161
1162
1163
1164
1165
1166
1167
1168
1169
1170
1171
1172
1173
1174
1175
1176
1177
1178
1179
1180
1181
1182
1183
1184
1185
1186
1187
1188
1189
1190
1191
1192
1193
1194
1195
1196
1197
1198
1199
1200
1201
1202
1203
1204
1205
1206
1207
1208
1209
1210
1211
1212
1213
1214
1215
1216
1217
1218
1219
1220
1221
1222
1223
1224
1225
1226
1227
1228
1229
1230
1231
1232
1233
1234
1235
1236
1237
1238
1239
1240
1241
1242
1243
1244
1245
1246
1247
1248
1249
1250
1251
1252
1253
1254
1255
1256
1257
1258
1259
1260
1261
1262
1263
1264
1265
1266
1267
1268
1269
1270
1271
1272
1273
1274
1275
1276
1277
1278
1279
1280
1281
1282
1283
1284
1285
1286
1287
1288
1289
1290
1291
1292
1293
1294
1295
1296
1297
1298
1299
1300
1301
1302
1303
1304
1305
1306
1307
1308
1309
1310
1311
1312
1313
1314
1315
1316
1317
1318
1319
1320
1321
1322
1323
1324
1325
1326
1327
1328
1329
1330
1331
1332
1333
1334
1335
1336
1337
1338
1339
1340
1341
1342
1343
1344
1345
1346
1347
1348
1349
1350
1351
1352
1353
1354
1355
1356
1357
1358
1359
1360
1361
1362
1363
1364
1365
1366
1367
1368
1369
1370
1371
1372
1373
1374
1375
1376
1377
1378
1379
1380
1381
1382
1383
1384
1385
1386
1387
1388
1389
1390
1391
1392
1393
1394
1395
1396
1397
1398
1399
1400
1401
1402
1403
1404
1405
1406
1407
1408
1409
1410
1411
1412
1413
1414
1415
1416
1417
1418
1419
1420
1421
1422
1423
1424
1425
1426
1427
1428
1429
1430
1431
1432
1433
1434
1435
1436
1437
1438
1439
1440
1441
1442
1443
1444
1445
1446
1447
1448
1449
1450
1451
1452
1453
1454
1455
1456
1457
1458
1459
1460
1461
1462
1463
1464
1465
1466
1467
1468
1469
1470
1471
1472
1473
1474
1475
1476
1477
1478
1479
1480
1481
1482
1483
1484
1485
1486
1487
1488
1489
1490
1491
1492
1493
1494
1495
1496
1497
1498
1499
1500
1501
1502
1503
1504
1505
1506
1507
1508
1509
1510
1511
1512
1513
1514
1515
1516
1517
1518
1519
1520
1521
1522
1523
1524
1525
1526
1527
1528
1529
1530
1531
1532
1533
1534
1535
1536
1537
1538
1539
1540
1541
1542
1543
1544
1545
1546
1547
1548
1549
1550
1551
1552
1553
1554
1555
1556
1557
1558
1559
1560
1561
1562
1563
1564
1565
1566
1567
1568
1569
1570
1571
1572
1573
1574
1575
1576
1577
1578
1579
1580
1581
1582
1583
1584
1585
1586
1587
1588
1589
1590
1591
1592
1593
1594
1595
1596
1597
1598
1599
1600
1601
1602
1603
1604
1605
1606
1607
1608
1609
1610
1611
1612
1613
1614
1615
1616
1617
1618
1619
1620
1621
1622
1623
1624
1625
1626
1627
1628
1629
1630
1631
1632
1633
1634
1635
1636
1637
1638
1639
1640
1641
1642
1643
1644
1645
1646
1647
1648
1649
1650
1651
1652
1653
1654
1655
1656
1657
1658
1659
1660
1661
1662
1663
1664
1665
1666
1667
1668
1669
1670
1671
1672
1673
1674
1675
1676
1677
1678
1679
1680
1681
1682
1683
1684
1685
1686
1687
1688
1689
1690
1691
1692
1693
1694
1695
1696
1697
1698
1699
1700
1701
1702
1703
1704
1705
1706
1707
1708
1709
1710
1711
1712
1713
1714
1715
1716
1717
1718
1719
1720
1721
1722
1723
1724
1725
1726
1727
1728
1729
1730
1731
1732
1733
1734
1735
1736
1737
1738
1739
1740
1741
1742
1743
1744
1745
1746
1747
1748
1749
1750
1751
1752
1753
1754
1755
1756
1757
1758
1759
1760
1761
1762
1763
1764
1765
1766
1767
1768
1769
1770
1771
1772
1773
1774
1775
1776
1777
1778
1779
1780
1781
1782
1783
1784
1785
1786
1787
1788
1789
1790
1791
1792
1793
1794
1795
1796
1797
1798
1799
1800
1801
1802
1803
1804
1805
1806
1807
1808
1809
1810
1811
1812
1813
1814
1815
1816
1817
1818
1819
1820
1821
1822
1823
1824
1825
1826
1827
1828
1829
1830
1831
1832
1833
1834
1835
1836
1837
1838
1839
1840
1841
1842
1843
1844
1845
1846
1847
1848
1849
1850
1851
1852
1853
1854
1855
1856
1857
1858
1859
1860
1861
1862
1863
1864
1865
1866
1867
1868
1869
1870
1871
1872
1873
1874
1875
1876
1877
1878
1879
1880
1881
1882
1883
1884
1885
1886
1887
1888
1889
1890
1891
1892
1893
1894
1895
1896
1897
1898
1899
1900
1901
1902
1903
1904
1905
1906
1907
1908
1909
1910
1911
1912
1913
1914
1915
1916
1917
1918
1919
1920
1921
1922
1923
1924
1925
1926
1927
1928
1929
1930
1931
1932
1933
1934
1935
1936
1937
1938
1939
1940
1941
1942
1943
1944
1945
1946
1947
#include "cache.h"
#include "repository.h"
#include "config.h"
#include "lockfile.h"
#include "refs.h"
#include "pkt-line.h"
#include "commit.h"
#include "tag.h"
#include "exec-cmd.h"
#include "pack.h"
#include "sideband.h"
#include "fetch-pack.h"
#include "remote.h"
#include "run-command.h"
#include "connect.h"
#include "transport.h"
#include "version.h"
#include "oid-array.h"
#include "oidset.h"
#include "packfile.h"
#include "object-store.h"
#include "connected.h"
#include "fetch-negotiator.h"
#include "fsck.h"
#include "shallow.h"
 
static int transfer_unpack_limit = -1;
static int fetch_unpack_limit = -1;
static int unpack_limit = 100;
static int prefer_ofs_delta = 1;
static int no_done;
static int deepen_since_ok;
static int deepen_not_ok;
static int fetch_fsck_objects = -1;
static int transfer_fsck_objects = -1;
static int agent_supported;
static int server_supports_filtering;
static struct shallow_lock shallow_lock;
static const char *alternate_shallow_file;
static struct strbuf fsck_msg_types = STRBUF_INIT;
static struct string_list uri_protocols = STRING_LIST_INIT_DUP;
 
/* Remember to update object flag allocation in object.h */
#define COMPLETE	(1U << 0)
#define ALTERNATE	(1U << 1)
 
/*
 * After sending this many "have"s if we do not get any new ACK , we
 * give up traversing our history.
 */
#define MAX_IN_VAIN 256
 
static int multi_ack, use_sideband;
/* Allow specifying sha1 if it is a ref tip. */
#define ALLOW_TIP_SHA1	01
/* Allow request of a sha1 if it is reachable from a ref (possibly hidden ref). */
#define ALLOW_REACHABLE_SHA1	02
static unsigned int allow_unadvertised_object_request;
 
__attribute__((format (printf, 2, 3)))
static inline void print_verbose(const struct fetch_pack_args *args,
				 const char *fmt, ...)
{
	va_list params;
 
	if (!args->verbose)
		return;
 
	va_start(params, fmt);
	vfprintf(stderr, fmt, params);
	va_end(params);
	fputc('\n', stderr);
}
 
struct alternate_object_cache {
	struct object **items;
	size_t nr, alloc;
};
 
static void cache_one_alternate(const struct object_id *oid,
				void *vcache)
{
	struct alternate_object_cache *cache = vcache;
	struct object *obj = parse_object(the_repository, oid);
 
	if (!obj || (obj->flags & ALTERNATE))
		return;
 
	obj->flags |= ALTERNATE;
	ALLOC_GROW(cache->items, cache->nr + 1, cache->alloc);
	cache->items[cache->nr++] = obj;
}
 
static void for_each_cached_alternate(struct fetch_negotiator *negotiator,
				      void (*cb)(struct fetch_negotiator *,
						 struct object *))
{
	static int initialized;
	static struct alternate_object_cache cache;
	size_t i;
 
	if (!initialized) {
		for_each_alternate_ref(cache_one_alternate, &cache);
		initialized = 1;
	}
 
	for (i = 0; i < cache.nr; i++)
		cb(negotiator, cache.items[i]);
}
 
static struct commit *deref_without_lazy_fetch(const struct object_id *oid,
					       int mark_tags_complete)
{
	enum object_type type;
	struct object_info info = { .typep = &type };
 
	while (1) {
		if (oid_object_info_extended(the_repository, oid, &info,
					     OBJECT_INFO_SKIP_FETCH_OBJECT | OBJECT_INFO_QUICK))
			return NULL;
		if (type == OBJ_TAG) {
			struct tag *tag = (struct tag *)
				parse_object(the_repository, oid);
 
			if (!tag->tagged)
				return NULL;
			if (mark_tags_complete)
				tag->object.flags |= COMPLETE;
			oid = &tag->tagged->oid;
		} else {
			break;
		}
	}
	if (type == OBJ_COMMIT)
		return (struct commit *) parse_object(the_repository, oid);
	return NULL;
}
 
static int rev_list_insert_ref(struct fetch_negotiator *negotiator,
			       const struct object_id *oid)
{
	struct commit *c = deref_without_lazy_fetch(oid, 0);
 
	if (c)
		negotiator->add_tip(negotiator, c);
	return 0;
}
 
static int rev_list_insert_ref_oid(const char *refname, const struct object_id *oid,
				   int flag, void *cb_data)
{
	return rev_list_insert_ref(cb_data, oid);
}
 
enum ack_type {
	NAK = 0,
	ACK,
	ACK_continue,
	ACK_common,
	ACK_ready
};
 
static void consume_shallow_list(struct fetch_pack_args *args,
				 struct packet_reader *reader)
{
	if (args->stateless_rpc && args->deepen) {
		/* If we sent a depth we will get back "duplicate"
		 * shallow and unshallow commands every time there
		 * is a block of have lines exchanged.
		 */
		while (packet_reader_read(reader) == PACKET_READ_NORMAL) {
			if (starts_with(reader->line, "shallow "))
				continue;
			if (starts_with(reader->line, "unshallow "))
				continue;
			die(_("git fetch-pack: expected shallow list"));
		}
		if (reader->status != PACKET_READ_FLUSH)
			die(_("git fetch-pack: expected a flush packet after shallow list"));
	}
}
 
static enum ack_type get_ack(struct packet_reader *reader,
			     struct object_id *result_oid)
{
	int len;
	const char *arg;
 
	if (packet_reader_read(reader) != PACKET_READ_NORMAL)
		die(_("git fetch-pack: expected ACK/NAK, got a flush packet"));
	len = reader->pktlen;
 
	if (!strcmp(reader->line, "NAK"))
		return NAK;
	if (skip_prefix(reader->line, "ACK ", &arg)) {
		const char *p;
		if (!parse_oid_hex(arg, result_oid, &p)) {
			len -= p - reader->line;
			if (len < 1)
				return ACK;
			if (strstr(p, "continue"))
				return ACK_continue;
			if (strstr(p, "common"))
				return ACK_common;
			if (strstr(p, "ready"))
				return ACK_ready;
			return ACK;
		}
	}
	die(_("git fetch-pack: expected ACK/NAK, got '%s'"), reader->line);
}
 
static void send_request(struct fetch_pack_args *args,
			 int fd, struct strbuf *buf)
{
	if (args->stateless_rpc) {
		send_sideband(fd, -1, buf->buf, buf->len, LARGE_PACKET_MAX);
		packet_flush(fd);
	} else {
		if (write_in_full(fd, buf->buf, buf->len) < 0)
			die_errno(_("unable to write to remote"));
	}
}
 
static void insert_one_alternate_object(struct fetch_negotiator *negotiator,
					struct object *obj)
{
	rev_list_insert_ref(negotiator, &obj->oid);
}
 
#define INITIAL_FLUSH 16
#define PIPESAFE_FLUSH 32
#define LARGE_FLUSH 16384
 
static int next_flush(int stateless_rpc, int count)
{
	if (stateless_rpc) {
		if (count < LARGE_FLUSH)
			count <<= 1;
		else
			count = count * 11 / 10;
	} else {
		if (count < PIPESAFE_FLUSH)
			count <<= 1;
		else
			count += PIPESAFE_FLUSH;
	}
	return count;
}
 
static void mark_tips(struct fetch_negotiator *negotiator,
		      const struct oid_array *negotiation_tips)
{
	int i;
 
	if (!negotiation_tips) {
		for_each_rawref(rev_list_insert_ref_oid, negotiator);
		return;
	}
 
	for (i = 0; i < negotiation_tips->nr; i++)
		rev_list_insert_ref(negotiator, &negotiation_tips->oid[i]);
	return;
}
 
static int find_common(struct fetch_negotiator *negotiator,
		       struct fetch_pack_args *args,
		       int fd[2], struct object_id *result_oid,
		       struct ref *refs)
{
	int fetching;
	int count = 0, flushes = 0, flush_at = INITIAL_FLUSH, retval;
	const struct object_id *oid;
	unsigned in_vain = 0;
	int got_continue = 0;
	int got_ready = 0;
	struct strbuf req_buf = STRBUF_INIT;
	size_t state_len = 0;
	struct packet_reader reader;
 
	if (args->stateless_rpc && multi_ack == 1)
		die(_("--stateless-rpc requires multi_ack_detailed"));
 
	packet_reader_init(&reader, fd[0], NULL, 0,
			   PACKET_READ_CHOMP_NEWLINE |
			   PACKET_READ_DIE_ON_ERR_PACKET);
 
	mark_tips(negotiator, args->negotiation_tips);
	for_each_cached_alternate(negotiator, insert_one_alternate_object);
 
	fetching = 0;
	for ( ; refs ; refs = refs->next) {
		struct object_id *remote = &refs->old_oid;
		const char *remote_hex;
		struct object *o;
 
		/*
		 * If that object is complete (i.e. it is an ancestor of a
		 * local ref), we tell them we have it but do not have to
		 * tell them about its ancestors, which they already know
		 * about.
		 *
		 * We use lookup_object here because we are only
		 * interested in the case we *know* the object is
		 * reachable and we have already scanned it.
		 */
		if (((o = lookup_object(the_repository, remote)) != NULL) &&
				(o->flags & COMPLETE)) {
			continue;
		}
 
		remote_hex = oid_to_hex(remote);
		if (!fetching) {
			struct strbuf c = STRBUF_INIT;
			if (multi_ack == 2)     strbuf_addstr(&c, " multi_ack_detailed");
			if (multi_ack == 1)     strbuf_addstr(&c, " multi_ack");
			if (no_done)            strbuf_addstr(&c, " no-done");
			if (use_sideband == 2)  strbuf_addstr(&c, " side-band-64k");
			if (use_sideband == 1)  strbuf_addstr(&c, " side-band");
			if (args->deepen_relative) strbuf_addstr(&c, " deepen-relative");
			if (args->use_thin_pack) strbuf_addstr(&c, " thin-pack");
			if (args->no_progress)   strbuf_addstr(&c, " no-progress");
			if (args->include_tag)   strbuf_addstr(&c, " include-tag");
			if (prefer_ofs_delta)   strbuf_addstr(&c, " ofs-delta");
			if (deepen_since_ok)    strbuf_addstr(&c, " deepen-since");
			if (deepen_not_ok)      strbuf_addstr(&c, " deepen-not");
			if (agent_supported)    strbuf_addf(&c, " agent=%s",
							    git_user_agent_sanitized());
			if (args->filter_options.choice)
				strbuf_addstr(&c, " filter");
			packet_buf_write(&req_buf, "want %s%s\n", remote_hex, c.buf);
			strbuf_release(&c);
		} else
			packet_buf_write(&req_buf, "want %s\n", remote_hex);
		fetching++;
	}
 
	if (!fetching) {
		strbuf_release(&req_buf);
		packet_flush(fd[1]);
		return 1;
	}
 
	if (is_repository_shallow(the_repository))
		write_shallow_commits(&req_buf, 1, NULL);
	if (args->depth > 0)
		packet_buf_write(&req_buf, "deepen %d", args->depth);
	if (args->deepen_since) {
		timestamp_t max_age = approxidate(args->deepen_since);
		packet_buf_write(&req_buf, "deepen-since %"PRItime, max_age);
	}
	if (args->deepen_not) {
		int i;
		for (i = 0; i < args->deepen_not->nr; i++) {
			struct string_list_item *s = args->deepen_not->items + i;
			packet_buf_write(&req_buf, "deepen-not %s", s->string);
		}
	}
	if (server_supports_filtering && args->filter_options.choice) {
		const char *spec =
			expand_list_objects_filter_spec(&args->filter_options);
		packet_buf_write(&req_buf, "filter %s", spec);
	}
	packet_buf_flush(&req_buf);
	state_len = req_buf.len;
 
	if (args->deepen) {
		const char *arg;
		struct object_id oid;
 
		send_request(args, fd[1], &req_buf);
		while (packet_reader_read(&reader) == PACKET_READ_NORMAL) {
			if (skip_prefix(reader.line, "shallow ", &arg)) {
				if (get_oid_hex(arg, &oid))
					die(_("invalid shallow line: %s"), reader.line);
				register_shallow(the_repository, &oid);
				continue;
			}
			if (skip_prefix(reader.line, "unshallow ", &arg)) {
				if (get_oid_hex(arg, &oid))
					die(_("invalid unshallow line: %s"), reader.line);
				if (!lookup_object(the_repository, &oid))
					die(_("object not found: %s"), reader.line);
				/* make sure that it is parsed as shallow */
				if (!parse_object(the_repository, &oid))
					die(_("error in object: %s"), reader.line);
				if (unregister_shallow(&oid))
					die(_("no shallow found: %s"), reader.line);
				continue;
			}
			die(_("expected shallow/unshallow, got %s"), reader.line);
		}
	} else if (!args->stateless_rpc)
		send_request(args, fd[1], &req_buf);
 
	if (!args->stateless_rpc) {
		/* If we aren't using the stateless-rpc interface
		 * we don't need to retain the headers.
		 */
		strbuf_setlen(&req_buf, 0);
		state_len = 0;
	}
 
	trace2_region_enter("fetch-pack", "negotiation_v0_v1", the_repository);
	flushes = 0;
	retval = -1;
	while ((oid = negotiator->next(negotiator))) {
		packet_buf_write(&req_buf, "have %s\n", oid_to_hex(oid));
		print_verbose(args, "have %s", oid_to_hex(oid));
		in_vain++;
		if (flush_at <= ++count) {
			int ack;
 
			packet_buf_flush(&req_buf);
			send_request(args, fd[1], &req_buf);
			strbuf_setlen(&req_buf, state_len);
			flushes++;
			flush_at = next_flush(args->stateless_rpc, count);
 
			/*
			 * We keep one window "ahead" of the other side, and
			 * will wait for an ACK only on the next one
			 */
			if (!args->stateless_rpc && count == INITIAL_FLUSH)
				continue;
 
			consume_shallow_list(args, &reader);
			do {
				ack = get_ack(&reader, result_oid);
				if (ack)
					print_verbose(args, _("got %s %d %s"), "ack",
						      ack, oid_to_hex(result_oid));
				switch (ack) {
				case ACK:
					flushes = 0;
					multi_ack = 0;
					retval = 0;
					goto done;
				case ACK_common:
				case ACK_ready:
				case ACK_continue: {
					struct commit *commit =
						lookup_commit(the_repository,
							      result_oid);
					int was_common;
 
					if (!commit)
						die(_("invalid commit %s"), oid_to_hex(result_oid));
					was_common = negotiator->ack(negotiator, commit);
					if (args->stateless_rpc
					 && ack == ACK_common
					 && !was_common) {
						/* We need to replay the have for this object
						 * on the next RPC request so the peer knows
						 * it is in common with us.
						 */
						const char *hex = oid_to_hex(result_oid);
						packet_buf_write(&req_buf, "have %s\n", hex);
						state_len = req_buf.len;
						/*
						 * Reset in_vain because an ack
						 * for this commit has not been
						 * seen.
						 */
						in_vain = 0;
					} else if (!args->stateless_rpc
						   || ack != ACK_common)
						in_vain = 0;
					retval = 0;
					got_continue = 1;
					if (ack == ACK_ready)
						got_ready = 1;
					break;
					}
				}
			} while (ack);
			flushes--;
			if (got_continue && MAX_IN_VAIN < in_vain) {
				print_verbose(args, _("giving up"));
				break; /* give up */
			}
			if (got_ready)
				break;
		}
	}
done:
	trace2_region_leave("fetch-pack", "negotiation_v0_v1", the_repository);
	if (!got_ready || !no_done) {
		packet_buf_write(&req_buf, "done\n");
		send_request(args, fd[1], &req_buf);
	}
	print_verbose(args, _("done"));
	if (retval != 0) {
		multi_ack = 0;
		flushes++;
	}
	strbuf_release(&req_buf);
 
	if (!got_ready || !no_done)
		consume_shallow_list(args, &reader);
	while (flushes || multi_ack) {
		int ack = get_ack(&reader, result_oid);
		if (ack) {
			print_verbose(args, _("got %s (%d) %s"), "ack",
				      ack, oid_to_hex(result_oid));
			if (ack == ACK)
				return 0;
			multi_ack = 1;
			continue;
		}
		flushes--;
	}
	/* it is no error to fetch into a completely empty repo */
	return count ? retval : 0;
}
 
static struct commit_list *complete;
 
static int mark_complete(const struct object_id *oid)
{
	struct commit *commit = deref_without_lazy_fetch(oid, 1);
 
	if (commit && !(commit->object.flags & COMPLETE)) {
		commit->object.flags |= COMPLETE;
		commit_list_insert(commit, &complete);
	}
	return 0;
}
 
static int mark_complete_oid(const char *refname, const struct object_id *oid,
			     int flag, void *cb_data)
{
	return mark_complete(oid);
}
 
static void mark_recent_complete_commits(struct fetch_pack_args *args,
					 timestamp_t cutoff)
{
	while (complete && cutoff <= complete->item->date) {
		print_verbose(args, _("Marking %s as complete"),
			      oid_to_hex(&complete->item->object.oid));
		pop_most_recent_commit(&complete, COMPLETE);
	}
}
 
static void add_refs_to_oidset(struct oidset *oids, struct ref *refs)
{
	for (; refs; refs = refs->next)
		oidset_insert(oids, &refs->old_oid);
}
 
static int is_unmatched_ref(const struct ref *ref)
{
	struct object_id oid;
	const char *p;
	return	ref->match_status == REF_NOT_MATCHED &&
		!parse_oid_hex(ref->name, &oid, &p) &&
		*p == '\0' &&
		oideq(&oid, &ref->old_oid);
}
 
static void filter_refs(struct fetch_pack_args *args,
			struct ref **refs,
			struct ref **sought, int nr_sought)
{
	struct ref *newlist = NULL;
	struct ref **newtail = &newlist;
	struct ref *unmatched = NULL;
	struct ref *ref, *next;
	struct oidset tip_oids = OIDSET_INIT;
	int i;
	int strict = !(allow_unadvertised_object_request &
		       (ALLOW_TIP_SHA1 | ALLOW_REACHABLE_SHA1));
 
	i = 0;
	for (ref = *refs; ref; ref = next) {
		int keep = 0;
		next = ref->next;
 
		if (starts_with(ref->name, "refs/") &&
		    check_refname_format(ref->name, 0)) {
			/*
			 * trash or a peeled value; do not even add it to
			 * unmatched list
			 */
			free_one_ref(ref);
			continue;
		} else {
			while (i < nr_sought) {
				int cmp = strcmp(ref->name, sought[i]->name);
				if (cmp < 0)
					break; /* definitely do not have it */
				else if (cmp == 0) {
					keep = 1; /* definitely have it */
					sought[i]->match_status = REF_MATCHED;
				}
				i++;
			}
 
			if (!keep && args->fetch_all &&
			    (!args->deepen || !starts_with(ref->name, "refs/tags/")))
				keep = 1;
		}
 
		if (keep) {
			*newtail = ref;
			ref->next = NULL;
			newtail = &ref->next;
		} else {
			ref->next = unmatched;
			unmatched = ref;
		}
	}
 
	if (strict) {
		for (i = 0; i < nr_sought; i++) {
			ref = sought[i];
			if (!is_unmatched_ref(ref))
				continue;
 
			add_refs_to_oidset(&tip_oids, unmatched);
			add_refs_to_oidset(&tip_oids, newlist);
			break;
		}
	}
 
	/* Append unmatched requests to the list */
	for (i = 0; i < nr_sought; i++) {
		ref = sought[i];
		if (!is_unmatched_ref(ref))
			continue;
 
		if (!strict || oidset_contains(&tip_oids, &ref->old_oid)) {
			ref->match_status = REF_MATCHED;
			*newtail = copy_ref(ref);
			newtail = &(*newtail)->next;
		} else {
			ref->match_status = REF_UNADVERTISED_NOT_ALLOWED;
		}
	}
 
	oidset_clear(&tip_oids);
	free_refs(unmatched);
 
	*refs = newlist;
}
 
static void mark_alternate_complete(struct fetch_negotiator *unused,
				    struct object *obj)
{
	mark_complete(&obj->oid);
}
 
struct loose_object_iter {
	struct oidset *loose_object_set;
	struct ref *refs;
};
 
/*
 * Mark recent commits available locally and reachable from a local ref as
 * COMPLETE.
 *
 * The cutoff time for recency is determined by this heuristic: it is the
 * earliest commit time of the objects in refs that are commits and that we know
 * the commit time of.
 */
static void mark_complete_and_common_ref(struct fetch_negotiator *negotiator,
					 struct fetch_pack_args *args,
					 struct ref **refs)
{
	struct ref *ref;
	int old_save_commit_buffer = save_commit_buffer;
	timestamp_t cutoff = 0;
 
	save_commit_buffer = 0;
 
	trace2_region_enter("fetch-pack", "parse_remote_refs_and_find_cutoff", NULL);
	for (ref = *refs; ref; ref = ref->next) {
		struct object *o;
 
		if (!has_object_file_with_flags(&ref->old_oid,
						OBJECT_INFO_QUICK |
							OBJECT_INFO_SKIP_FETCH_OBJECT))
			continue;
		o = parse_object(the_repository, &ref->old_oid);
		if (!o)
			continue;
 
		/*
		 * We already have it -- which may mean that we were
		 * in sync with the other side at some time after
		 * that (it is OK if we guess wrong here).
		 */
		if (o->type == OBJ_COMMIT) {
			struct commit *commit = (struct commit *)o;
			if (!cutoff || cutoff < commit->date)
				cutoff = commit->date;
		}
	}
	trace2_region_leave("fetch-pack", "parse_remote_refs_and_find_cutoff", NULL);
 
	/*
	 * This block marks all local refs as COMPLETE, and then recursively marks all
	 * parents of those refs as COMPLETE.
	 */
	trace2_region_enter("fetch-pack", "mark_complete_local_refs", NULL);
	if (!args->deepen) {
		for_each_rawref(mark_complete_oid, NULL);
		for_each_cached_alternate(NULL, mark_alternate_complete);
		commit_list_sort_by_date(&complete);
		if (cutoff)
			mark_recent_complete_commits(args, cutoff);
	}
	trace2_region_leave("fetch-pack", "mark_complete_local_refs", NULL);
 
	/*
	 * Mark all complete remote refs as common refs.
	 * Don't mark them common yet; the server has to be told so first.
	 */
	trace2_region_enter("fetch-pack", "mark_common_remote_refs", NULL);
	for (ref = *refs; ref; ref = ref->next) {
		struct commit *c = deref_without_lazy_fetch(&ref->old_oid, 0);
 
		if (!c || !(c->object.flags & COMPLETE))
			continue;
 
		negotiator->known_common(negotiator, c);
	}
	trace2_region_leave("fetch-pack", "mark_common_remote_refs", NULL);
 
	save_commit_buffer = old_save_commit_buffer;
}
 
/*
 * Returns 1 if every object pointed to by the given remote refs is available
 * locally and reachable from a local ref, and 0 otherwise.
 */
static int everything_local(struct fetch_pack_args *args,
			    struct ref **refs)
{
	struct ref *ref;
	int retval;
 
	for (retval = 1, ref = *refs; ref ; ref = ref->next) {
		const struct object_id *remote = &ref->old_oid;
		struct object *o;
 
		o = lookup_object(the_repository, remote);
		if (!o || !(o->flags & COMPLETE)) {
			retval = 0;
			print_verbose(args, "want %s (%s)", oid_to_hex(remote),
				      ref->name);
			continue;
		}
		print_verbose(args, _("already have %s (%s)"), oid_to_hex(remote),
			      ref->name);
	}
 
	return retval;
}
 
static int sideband_demux(int in, int out, void *data)
{
	int *xd = data;
	int ret;
 
	ret = recv_sideband("fetch-pack", xd[0], out);
	close(out);
	return ret;
}
 
static void write_promisor_file(const char *keep_name,
				struct ref **sought, int nr_sought)
{
	struct strbuf promisor_name = STRBUF_INIT;
	int suffix_stripped;
	FILE *output;
	int i;
 
	strbuf_addstr(&promisor_name, keep_name);
	suffix_stripped = strbuf_strip_suffix(&promisor_name, ".keep");
	if (!suffix_stripped)
		BUG("name of pack lockfile should end with .keep (was '%s')",
		    keep_name);
	strbuf_addstr(&promisor_name, ".promisor");
 
	output = xfopen(promisor_name.buf, "w");
	for (i = 0; i < nr_sought; i++)
		fprintf(output, "%s %s\n", oid_to_hex(&sought[i]->old_oid),
			sought[i]->name);
	fclose(output);
 
	strbuf_release(&promisor_name);
}
 
/*
 * Pass 1 as "only_packfile" if the pack received is the only pack in this
 * fetch request (that is, if there were no packfile URIs provided).
 */
static int get_pack(struct fetch_pack_args *args,
		    int xd[2], struct string_list *pack_lockfiles,
		    int only_packfile,
		    struct ref **sought, int nr_sought)
{
	struct async demux;
	int do_keep = args->keep_pack;
	const char *cmd_name;
	struct pack_header header;
	int pass_header = 0;
	struct child_process cmd = CHILD_PROCESS_INIT;
	int ret;
 
	memset(&demux, 0, sizeof(demux));
	if (use_sideband) {
		/* xd[] is talking with upload-pack; subprocess reads from
		 * xd[0], spits out band#2 to stderr, and feeds us band#1
		 * through demux->out.
		 */
		demux.proc = sideband_demux;
		demux.data = xd;
		demux.out = -1;
		demux.isolate_sigpipe = 1;
		if (start_async(&demux))
			die(_("fetch-pack: unable to fork off sideband demultiplexer"));
	}
	else
		demux.out = xd[0];
 
	if (!args->keep_pack && unpack_limit) {
 
		if (read_pack_header(demux.out, &header))
			die(_("protocol error: bad pack header"));
		pass_header = 1;
		if (ntohl(header.hdr_entries) < unpack_limit)
			do_keep = 0;
		else
			do_keep = 1;
	}
 
	if (alternate_shallow_file) {
		strvec_push(&cmd.args, "--shallow-file");
		strvec_push(&cmd.args, alternate_shallow_file);
	}
 
	if (do_keep || args->from_promisor) {
		if (pack_lockfiles)
			cmd.out = -1;
		cmd_name = "index-pack";
		strvec_push(&cmd.args, cmd_name);
		strvec_push(&cmd.args, "--stdin");
		if (!args->quiet && !args->no_progress)
			strvec_push(&cmd.args, "-v");
		if (args->use_thin_pack)
			strvec_push(&cmd.args, "--fix-thin");
		if (do_keep && (args->lock_pack || unpack_limit)) {
			char hostname[HOST_NAME_MAX + 1];
			if (xgethostname(hostname, sizeof(hostname)))
				xsnprintf(hostname, sizeof(hostname), "localhost");
			strvec_pushf(&cmd.args,
				     "--keep=fetch-pack %"PRIuMAX " on %s",
				     (uintmax_t)getpid(), hostname);
		}
		if (only_packfile && args->check_self_contained_and_connected)
			strvec_push(&cmd.args, "--check-self-contained-and-connected");
		else
			/*
			 * We cannot perform any connectivity checks because
			 * not all packs have been downloaded; let the caller
			 * have this responsibility.
			 */
			args->check_self_contained_and_connected = 0;
 
		if (args->from_promisor)
			/*
			 * write_promisor_file() may be called afterwards but
			 * we still need index-pack to know that this is a
			 * promisor pack. For example, if transfer.fsckobjects
			 * is true, index-pack needs to know that .gitmodules
			 * is a promisor object (so that it won't complain if
			 * it is missing).
			 */
			strvec_push(&cmd.args, "--promisor");
	}
	else {
		cmd_name = "unpack-objects";
		strvec_push(&cmd.args, cmd_name);
		if (args->quiet || args->no_progress)
			strvec_push(&cmd.args, "-q");
		args->check_self_contained_and_connected = 0;
	}
 
	if (pass_header)
		strvec_pushf(&cmd.args, "--pack_header=%"PRIu32",%"PRIu32,
			     ntohl(header.hdr_version),
				 ntohl(header.hdr_entries));
	if (fetch_fsck_objects >= 0
	    ? fetch_fsck_objects
	    : transfer_fsck_objects >= 0
	    ? transfer_fsck_objects
	    : 0) {
		if (args->from_promisor || !only_packfile)
			/*
			 * We cannot use --strict in index-pack because it
			 * checks both broken objects and links, but we only
			 * want to check for broken objects.
			 */
			strvec_push(&cmd.args, "--fsck-objects");
		else
			strvec_pushf(&cmd.args, "--strict%s",
				     fsck_msg_types.buf);
	}
 
	cmd.in = demux.out;
	cmd.git_cmd = 1;
	if (start_command(&cmd))
		die(_("fetch-pack: unable to fork off %s"), cmd_name);
	if (do_keep && pack_lockfiles) {
		string_list_append_nodup(pack_lockfiles,
					 index_pack_lockfile(cmd.out));
		close(cmd.out);
	}
 
	if (!use_sideband)
		/* Closed by start_command() */
		xd[0] = -1;
 
	ret = finish_command(&cmd);
	if (!ret || (args->check_self_contained_and_connected && ret == 1))
		args->self_contained_and_connected =
			args->check_self_contained_and_connected &&
			ret == 0;
	else
		die(_("%s failed"), cmd_name);
	if (use_sideband && finish_async(&demux))
		die(_("error in sideband demultiplexer"));
 
	/*
	 * Now that index-pack has succeeded, write the promisor file using the
	 * obtained .keep filename if necessary
	 */
	if (do_keep && pack_lockfiles && pack_lockfiles->nr && args->from_promisor)
		write_promisor_file(pack_lockfiles->items[0].string, sought, nr_sought);
 
	return 0;
}
 
static int cmp_ref_by_name(const void *a_, const void *b_)
{
	const struct ref *a = *((const struct ref **)a_);
	const struct ref *b = *((const struct ref **)b_);
	return strcmp(a->name, b->name);
}
 
static struct ref *do_fetch_pack(struct fetch_pack_args *args,
				 int fd[2],
				 const struct ref *orig_ref,
				 struct ref **sought, int nr_sought,
				 struct shallow_info *si,
				 struct string_list *pack_lockfiles)
{
	struct repository *r = the_repository;
	struct ref *ref = copy_ref_list(orig_ref);
	struct object_id oid;
	const char *agent_feature;
	int agent_len;
	struct fetch_negotiator negotiator_alloc;
	struct fetch_negotiator *negotiator;
 
	negotiator = &negotiator_alloc;
	fetch_negotiator_init(r, negotiator);
 
	sort_ref_list(&ref, ref_compare_name);
	QSORT(sought, nr_sought, cmp_ref_by_name);
 
	if ((agent_feature = server_feature_value("agent", &agent_len))) {
		agent_supported = 1;
		if (agent_len)
			print_verbose(args, _("Server version is %.*s"),
				      agent_len, agent_feature);
	}
 
	if (server_supports("shallow"))
		print_verbose(args, _("Server supports %s"), "shallow");
	else if (args->depth > 0 || is_repository_shallow(r))
		die(_("Server does not support shallow clients"));
	if (args->depth > 0 || args->deepen_since || args->deepen_not)
		args->deepen = 1;
	if (server_supports("multi_ack_detailed")) {
		print_verbose(args, _("Server supports %s"), "multi_ack_detailed");
		multi_ack = 2;
		if (server_supports("no-done")) {
			print_verbose(args, _("Server supports %s"), "no-done");
			if (args->stateless_rpc)
				no_done = 1;
		}
	}
	else if (server_supports("multi_ack")) {
		print_verbose(args, _("Server supports %s"), "multi_ack");
		multi_ack = 1;
	}
	if (server_supports("side-band-64k")) {
		print_verbose(args, _("Server supports %s"), "side-band-64k");
		use_sideband = 2;
	}
	else if (server_supports("side-band")) {
		print_verbose(args, _("Server supports %s"), "side-band");
		use_sideband = 1;
	}
	if (server_supports("allow-tip-sha1-in-want")) {
		print_verbose(args, _("Server supports %s"), "allow-tip-sha1-in-want");
		allow_unadvertised_object_request |= ALLOW_TIP_SHA1;
	}
	if (server_supports("allow-reachable-sha1-in-want")) {
		print_verbose(args, _("Server supports %s"), "allow-reachable-sha1-in-want");
		allow_unadvertised_object_request |= ALLOW_REACHABLE_SHA1;
	}
	if (server_supports("thin-pack"))
		print_verbose(args, _("Server supports %s"), "thin-pack");
	else
		args->use_thin_pack = 0;
	if (server_supports("no-progress"))
		print_verbose(args, _("Server supports %s"), "no-progress");
	else
		args->no_progress = 0;
	if (server_supports("include-tag"))
		print_verbose(args, _("Server supports %s"), "include-tag");
	else
		args->include_tag = 0;
	if (server_supports("ofs-delta"))
		print_verbose(args, _("Server supports %s"), "ofs-delta");
	else
		prefer_ofs_delta = 0;
 
	if (server_supports("filter")) {
		server_supports_filtering = 1;
		print_verbose(args, _("Server supports %s"), "filter");
	} else if (args->filter_options.choice) {
		warning("filtering not recognized by server, ignoring");
	}
 
	if (server_supports("deepen-since")) {
		print_verbose(args, _("Server supports %s"), "deepen-since");
		deepen_since_ok = 1;
	} else if (args->deepen_since)
		die(_("Server does not support --shallow-since"));
	if (server_supports("deepen-not")) {
		print_verbose(args, _("Server supports %s"), "deepen-not");
		deepen_not_ok = 1;
	} else if (args->deepen_not)
		die(_("Server does not support --shallow-exclude"));
	if (server_supports("deepen-relative"))
		print_verbose(args, _("Server supports %s"), "deepen-relative");
	else if (args->deepen_relative)
		die(_("Server does not support --deepen"));
	if (!server_supports_hash(the_hash_algo->name, NULL))
		die(_("Server does not support this repository's object format"));
 
	mark_complete_and_common_ref(negotiator, args, &ref);
	filter_refs(args, &ref, sought, nr_sought);
	if (everything_local(args, &ref)) {
		packet_flush(fd[1]);
		goto all_done;
	}
	if (find_common(negotiator, args, fd, &oid, ref) < 0)
		if (!args->keep_pack)
			/* When cloning, it is not unusual to have
			 * no common commit.
			 */
			warning(_("no common commits"));
 
	if (args->stateless_rpc)
		packet_flush(fd[1]);
	if (args->deepen)
		setup_alternate_shallow(&shallow_lock, &alternate_shallow_file,
					NULL);
	else if (si->nr_ours || si->nr_theirs)
		alternate_shallow_file = setup_temporary_shallow(si->shallow);
	else
		alternate_shallow_file = NULL;
	if (get_pack(args, fd, pack_lockfiles, 1, sought, nr_sought))
		die(_("git fetch-pack: fetch failed."));
 
 all_done:
	if (negotiator)
		negotiator->release(negotiator);
	return ref;
}
 
static void add_shallow_requests(struct strbuf *req_buf,
				 const struct fetch_pack_args *args)
{
	if (is_repository_shallow(the_repository))
		write_shallow_commits(req_buf, 1, NULL);
	if (args->depth > 0)
		packet_buf_write(req_buf, "deepen %d", args->depth);
	if (args->deepen_since) {
		timestamp_t max_age = approxidate(args->deepen_since);
		packet_buf_write(req_buf, "deepen-since %"PRItime, max_age);
	}
	if (args->deepen_not) {
		int i;
		for (i = 0; i < args->deepen_not->nr; i++) {
			struct string_list_item *s = args->deepen_not->items + i;
			packet_buf_write(req_buf, "deepen-not %s", s->string);
		}
	}
	if (args->deepen_relative)
		packet_buf_write(req_buf, "deepen-relative\n");
}
 
static void add_wants(const struct ref *wants, struct strbuf *req_buf)
{
	int use_ref_in_want = server_supports_feature("fetch", "ref-in-want", 0);
 
	for ( ; wants ; wants = wants->next) {
		const struct object_id *remote = &wants->old_oid;
		struct object *o;
 
		/*
		 * If that object is complete (i.e. it is an ancestor of a
		 * local ref), we tell them we have it but do not have to
		 * tell them about its ancestors, which they already know
		 * about.
		 *
		 * We use lookup_object here because we are only
		 * interested in the case we *know* the object is
		 * reachable and we have already scanned it.
		 */
		if (((o = lookup_object(the_repository, remote)) != NULL) &&
		    (o->flags & COMPLETE)) {
			continue;
		}
 
		if (!use_ref_in_want || wants->exact_oid)
			packet_buf_write(req_buf, "want %s\n", oid_to_hex(remote));
		else
			packet_buf_write(req_buf, "want-ref %s\n", wants->name);
	}
}
 
static void add_common(struct strbuf *req_buf, struct oidset *common)
{
	struct oidset_iter iter;
	const struct object_id *oid;
	oidset_iter_init(common, &iter);
 
	while ((oid = oidset_iter_next(&iter))) {
		packet_buf_write(req_buf, "have %s\n", oid_to_hex(oid));
	}
}
 
static int add_haves(struct fetch_negotiator *negotiator,
		     int seen_ack,
		     struct strbuf *req_buf,
		     int *haves_to_send, int *in_vain)
{
	int ret = 0;
	int haves_added = 0;
	const struct object_id *oid;
 
	while ((oid = negotiator->next(negotiator))) {
		packet_buf_write(req_buf, "have %s\n", oid_to_hex(oid));
		if (++haves_added >= *haves_to_send)
			break;
	}
 
	*in_vain += haves_added;
	if (!haves_added || (seen_ack && *in_vain >= MAX_IN_VAIN)) {
		/* Send Done */
		packet_buf_write(req_buf, "done\n");
		ret = 1;
	}
 
	/* Increase haves to send on next round */
	*haves_to_send = next_flush(1, *haves_to_send);
 
	return ret;
}
 
static int send_fetch_request(struct fetch_negotiator *negotiator, int fd_out,
			      struct fetch_pack_args *args,
			      const struct ref *wants, struct oidset *common,
			      int *haves_to_send, int *in_vain,
			      int sideband_all, int seen_ack)
{
	int ret = 0;
	const char *hash_name;
	struct strbuf req_buf = STRBUF_INIT;
 
	if (server_supports_v2("fetch", 1))
		packet_buf_write(&req_buf, "command=fetch");
	if (server_supports_v2("agent", 0))
		packet_buf_write(&req_buf, "agent=%s", git_user_agent_sanitized());
	if (args->server_options && args->server_options->nr &&
	    server_supports_v2("server-option", 1)) {
		int i;
		for (i = 0; i < args->server_options->nr; i++)
			packet_buf_write(&req_buf, "server-option=%s",
					 args->server_options->items[i].string);
	}
 
	if (server_feature_v2("object-format", &hash_name)) {
		int hash_algo = hash_algo_by_name(hash_name);
		if (hash_algo_by_ptr(the_hash_algo) != hash_algo)
			die(_("mismatched algorithms: client %s; server %s"),
			    the_hash_algo->name, hash_name);
		packet_write_fmt(fd_out, "object-format=%s", the_hash_algo->name);
	} else if (hash_algo_by_ptr(the_hash_algo) != GIT_HASH_SHA1) {
		die(_("the server does not support algorithm '%s'"),
		    the_hash_algo->name);
	}
 
	packet_buf_delim(&req_buf);
	if (args->use_thin_pack)
		packet_buf_write(&req_buf, "thin-pack");
	if (args->no_progress)
		packet_buf_write(&req_buf, "no-progress");
	if (args->include_tag)
		packet_buf_write(&req_buf, "include-tag");
	if (prefer_ofs_delta)
		packet_buf_write(&req_buf, "ofs-delta");
	if (sideband_all)
		packet_buf_write(&req_buf, "sideband-all");
 
	/* Add shallow-info and deepen request */
	if (server_supports_feature("fetch", "shallow", 0))
		add_shallow_requests(&req_buf, args);
	else if (is_repository_shallow(the_repository) || args->deepen)
		die(_("Server does not support shallow requests"));
 
	/* Add filter */
	if (server_supports_feature("fetch", "filter", 0) &&
	    args->filter_options.choice) {
		const char *spec =
			expand_list_objects_filter_spec(&args->filter_options);
		print_verbose(args, _("Server supports filter"));
		packet_buf_write(&req_buf, "filter %s", spec);
	} else if (args->filter_options.choice) {
		warning("filtering not recognized by server, ignoring");
	}
 
	if (server_supports_feature("fetch", "packfile-uris", 0)) {
		int i;
		struct strbuf to_send = STRBUF_INIT;
 
		for (i = 0; i < uri_protocols.nr; i++) {
			const char *s = uri_protocols.items[i].string;
 
			if (!strcmp(s, "https") || !strcmp(s, "http")) {
				if (to_send.len)
					strbuf_addch(&to_send, ',');
				strbuf_addstr(&to_send, s);
			}
		}
		if (to_send.len) {
			packet_buf_write(&req_buf, "packfile-uris %s",
					 to_send.buf);
			strbuf_release(&to_send);
		}
	}
 
	/* add wants */
	add_wants(wants, &req_buf);
 
	/* Add all of the common commits we've found in previous rounds */
	add_common(&req_buf, common);
 
	/* Add initial haves */
	ret = add_haves(negotiator, seen_ack, &req_buf,
			haves_to_send, in_vain);
 
	/* Send request */
	packet_buf_flush(&req_buf);
	if (write_in_full(fd_out, req_buf.buf, req_buf.len) < 0)
		die_errno(_("unable to write request to remote"));
 
	strbuf_release(&req_buf);
	return ret;
}
 
/*
 * Processes a section header in a server's response and checks if it matches
 * `section`.  If the value of `peek` is 1, the header line will be peeked (and
 * not consumed); if 0, the line will be consumed and the function will die if
 * the section header doesn't match what was expected.
 */
static int process_section_header(struct packet_reader *reader,
				  const char *section, int peek)
{
	int ret;
 
	if (packet_reader_peek(reader) != PACKET_READ_NORMAL)
		die(_("error reading section header '%s'"), section);
 
	ret = !strcmp(reader->line, section);
 
	if (!peek) {
		if (!ret)
			die(_("expected '%s', received '%s'"),
			    section, reader->line);
		packet_reader_read(reader);
	}
 
	return ret;
}
 
enum common_found {
	/*
	 * No commit was found to be possessed by both the client and the
	 * server, and "ready" was not received.
	 */
	NO_COMMON_FOUND,
 
	/*
	 * At least one commit was found to be possessed by both the client and
	 * the server, and "ready" was not received.
	 */
	COMMON_FOUND,
 
	/*
	 * "ready" was received, indicating that the server is ready to send
	 * the packfile without any further negotiation.
	 */
	READY
};
 
static enum common_found process_acks(struct fetch_negotiator *negotiator,
				      struct packet_reader *reader,
				      struct oidset *common)
{
	/* received */
	int received_ready = 0;
	int received_ack = 0;
 
	process_section_header(reader, "acknowledgments", 0);
	while (packet_reader_read(reader) == PACKET_READ_NORMAL) {
		const char *arg;
 
		if (!strcmp(reader->line, "NAK"))
			continue;
 
		if (skip_prefix(reader->line, "ACK ", &arg)) {
			struct object_id oid;
			received_ack = 1;
			if (!get_oid_hex(arg, &oid)) {
				struct commit *commit;
				oidset_insert(common, &oid);
				commit = lookup_commit(the_repository, &oid);
				if (negotiator)
					negotiator->ack(negotiator, commit);
			}
			continue;
		}
 
		if (!strcmp(reader->line, "ready")) {
			received_ready = 1;
			continue;
		}
 
		die(_("unexpected acknowledgment line: '%s'"), reader->line);
	}
 
	if (reader->status != PACKET_READ_FLUSH &&
	    reader->status != PACKET_READ_DELIM)
		die(_("error processing acks: %d"), reader->status);
 
	/*
	 * If an "acknowledgments" section is sent, a packfile is sent if and
	 * only if "ready" was sent in this section. The other sections
	 * ("shallow-info" and "wanted-refs") are sent only if a packfile is
	 * sent. Therefore, a DELIM is expected if "ready" is sent, and a FLUSH
	 * otherwise.
	 */
	if (received_ready && reader->status != PACKET_READ_DELIM)
		die(_("expected packfile to be sent after 'ready'"));
	if (!received_ready && reader->status != PACKET_READ_FLUSH)
		die(_("expected no other sections to be sent after no 'ready'"));
 
	return received_ready ? READY :
		(received_ack ? COMMON_FOUND : NO_COMMON_FOUND);
}
 
static void receive_shallow_info(struct fetch_pack_args *args,
				 struct packet_reader *reader,
				 struct oid_array *shallows,
				 struct shallow_info *si)
{
	int unshallow_received = 0;
 
	process_section_header(reader, "shallow-info", 0);
	while (packet_reader_read(reader) == PACKET_READ_NORMAL) {
		const char *arg;
		struct object_id oid;
 
		if (skip_prefix(reader->line, "shallow ", &arg)) {
			if (get_oid_hex(arg, &oid))
				die(_("invalid shallow line: %s"), reader->line);
			oid_array_append(shallows, &oid);
			continue;
		}
		if (skip_prefix(reader->line, "unshallow ", &arg)) {
			if (get_oid_hex(arg, &oid))
				die(_("invalid unshallow line: %s"), reader->line);
			if (!lookup_object(the_repository, &oid))
				die(_("object not found: %s"), reader->line);
			/* make sure that it is parsed as shallow */
			if (!parse_object(the_repository, &oid))
				die(_("error in object: %s"), reader->line);
			if (unregister_shallow(&oid))
				die(_("no shallow found: %s"), reader->line);
			unshallow_received = 1;
			continue;
		}
		die(_("expected shallow/unshallow, got %s"), reader->line);
	}
 
	if (reader->status != PACKET_READ_FLUSH &&
	    reader->status != PACKET_READ_DELIM)
		die(_("error processing shallow info: %d"), reader->status);
 
	if (args->deepen || unshallow_received) {
		/*
		 * Treat these as shallow lines caused by our depth settings.
		 * In v0, these lines cannot cause refs to be rejected; do the
		 * same.
		 */
		int i;
 
		for (i = 0; i < shallows->nr; i++)
			register_shallow(the_repository, &shallows->oid[i]);
		setup_alternate_shallow(&shallow_lock, &alternate_shallow_file,
					NULL);
		args->deepen = 1;
	} else if (shallows->nr) {
		/*
		 * Treat these as shallow lines caused by the remote being
		 * shallow. In v0, remote refs that reach these objects are
		 * rejected (unless --update-shallow is set); do the same.
		 */
		prepare_shallow_info(si, shallows);
		if (si->nr_ours || si->nr_theirs)
			alternate_shallow_file =
				setup_temporary_shallow(si->shallow);
		else
			alternate_shallow_file = NULL;
	} else {
		alternate_shallow_file = NULL;
	}
}
 
static int cmp_name_ref(const void *name, const void *ref)
{
	return strcmp(name, (*(struct ref **)ref)->name);
}
 
static void receive_wanted_refs(struct packet_reader *reader,
				struct ref **sought, int nr_sought)
{
	process_section_header(reader, "wanted-refs", 0);
	while (packet_reader_read(reader) == PACKET_READ_NORMAL) {
		struct object_id oid;
		const char *end;
		struct ref **found;
 
		if (parse_oid_hex(reader->line, &oid, &end) || *end++ != ' ')
			die(_("expected wanted-ref, got '%s'"), reader->line);
 
		found = bsearch(end, sought, nr_sought, sizeof(*sought),
				cmp_name_ref);
		if (!found)
			die(_("unexpected wanted-ref: '%s'"), reader->line);
		oidcpy(&(*found)->old_oid, &oid);
	}
 
	if (reader->status != PACKET_READ_DELIM)
		die(_("error processing wanted refs: %d"), reader->status);
}
 
static void receive_packfile_uris(struct packet_reader *reader,
				  struct string_list *uris)
{
	process_section_header(reader, "packfile-uris", 0);
	while (packet_reader_read(reader) == PACKET_READ_NORMAL) {
		if (reader->pktlen < the_hash_algo->hexsz ||
		    reader->line[the_hash_algo->hexsz] != ' ')
			die("expected '<hash> <uri>', got: %s\n", reader->line);
 
		string_list_append(uris, reader->line);
	}
	if (reader->status != PACKET_READ_DELIM)
		die("expected DELIM");
}
 
enum fetch_state {
	FETCH_CHECK_LOCAL = 0,
	FETCH_SEND_REQUEST,
	FETCH_PROCESS_ACKS,
	FETCH_GET_PACK,
	FETCH_DONE,
};
 
static void do_check_stateless_delimiter(const struct fetch_pack_args *args,
					 struct packet_reader *reader)
{
	check_stateless_delimiter(args->stateless_rpc, reader,
				  _("git fetch-pack: expected response end packet"));
}
 
static struct ref *do_fetch_pack_v2(struct fetch_pack_args *args,
				    int fd[2],
				    const struct ref *orig_ref,
				    struct ref **sought, int nr_sought,
				    struct oid_array *shallows,
				    struct shallow_info *si,
				    struct string_list *pack_lockfiles)
{
	struct repository *r = the_repository;
	struct ref *ref = copy_ref_list(orig_ref);
	enum fetch_state state = FETCH_CHECK_LOCAL;
	struct oidset common = OIDSET_INIT;
	struct packet_reader reader;
	int in_vain = 0, negotiation_started = 0;
	int haves_to_send = INITIAL_FLUSH;
	struct fetch_negotiator negotiator_alloc;
	struct fetch_negotiator *negotiator;
	int seen_ack = 0;
	struct string_list packfile_uris = STRING_LIST_INIT_DUP;
	int i;
 
	negotiator = &negotiator_alloc;
	fetch_negotiator_init(r, negotiator);
 
	packet_reader_init(&reader, fd[0], NULL, 0,
			   PACKET_READ_CHOMP_NEWLINE |
			   PACKET_READ_DIE_ON_ERR_PACKET);
	if (git_env_bool("GIT_TEST_SIDEBAND_ALL", 1) &&
	    server_supports_feature("fetch", "sideband-all", 0)) {
		reader.use_sideband = 1;
		reader.me = "fetch-pack";
	}
 
	while (state != FETCH_DONE) {
		switch (state) {
		case FETCH_CHECK_LOCAL:
			sort_ref_list(&ref, ref_compare_name);
			QSORT(sought, nr_sought, cmp_ref_by_name);
 
			/* v2 supports these by default */
			allow_unadvertised_object_request |= ALLOW_REACHABLE_SHA1;
			use_sideband = 2;
			if (args->depth > 0 || args->deepen_since || args->deepen_not)
				args->deepen = 1;
 
			/* Filter 'ref' by 'sought' and those that aren't local */
			mark_complete_and_common_ref(negotiator, args, &ref);
			filter_refs(args, &ref, sought, nr_sought);
			if (everything_local(args, &ref))
				state = FETCH_DONE;
			else
				state = FETCH_SEND_REQUEST;
 
			mark_tips(negotiator, args->negotiation_tips);
			for_each_cached_alternate(negotiator,
						  insert_one_alternate_object);
			break;
		case FETCH_SEND_REQUEST:
			if (!negotiation_started) {
				negotiation_started = 1;
				trace2_region_enter("fetch-pack",
						    "negotiation_v2",
						    the_repository);
			}
			if (send_fetch_request(negotiator, fd[1], args, ref,
					       &common,
					       &haves_to_send, &in_vain,
					       reader.use_sideband,
					       seen_ack))
				state = FETCH_GET_PACK;
			else
				state = FETCH_PROCESS_ACKS;
			break;
		case FETCH_PROCESS_ACKS:
			/* Process ACKs/NAKs */
			switch (process_acks(negotiator, &reader, &common)) {
			case READY:
				/*
				 * Don't check for response delimiter; get_pack() will
				 * read the rest of this response.
				 */
				state = FETCH_GET_PACK;
				break;
			case COMMON_FOUND:
				in_vain = 0;
				seen_ack = 1;
				/* fallthrough */
			case NO_COMMON_FOUND:
				do_check_stateless_delimiter(args, &reader);
				state = FETCH_SEND_REQUEST;
				break;
			}
			break;
		case FETCH_GET_PACK:
			trace2_region_leave("fetch-pack",
					    "negotiation_v2",
					    the_repository);
			/* Check for shallow-info section */
			if (process_section_header(&reader, "shallow-info", 1))
				receive_shallow_info(args, &reader, shallows, si);
 
			if (process_section_header(&reader, "wanted-refs", 1))
				receive_wanted_refs(&reader, sought, nr_sought);
 
			/* get the pack(s) */
			if (process_section_header(&reader, "packfile-uris", 1))
				receive_packfile_uris(&reader, &packfile_uris);
			process_section_header(&reader, "packfile", 0);
			if (get_pack(args, fd, pack_lockfiles,
				     !packfile_uris.nr, sought, nr_sought))
				die(_("git fetch-pack: fetch failed."));
			do_check_stateless_delimiter(args, &reader);
 
			state = FETCH_DONE;
			break;
		case FETCH_DONE:
			continue;
		}
	}
 
	for (i = 0; i < packfile_uris.nr; i++) {
		struct child_process cmd = CHILD_PROCESS_INIT;
		char packname[GIT_MAX_HEXSZ + 1];
		const char *uri = packfile_uris.items[i].string +
			the_hash_algo->hexsz + 1;
 
		strvec_push(&cmd.args, "http-fetch");
		strvec_pushf(&cmd.args, "--packfile=%.*s",
			     (int) the_hash_algo->hexsz,
			     packfile_uris.items[i].string);
		strvec_push(&cmd.args, uri);
		cmd.git_cmd = 1;
		cmd.no_stdin = 1;
		cmd.out = -1;
		if (start_command(&cmd))
			die("fetch-pack: unable to spawn http-fetch");
 
		if (read_in_full(cmd.out, packname, 5) < 0 ||
		    memcmp(packname, "keep\t", 5))
			die("fetch-pack: expected keep then TAB at start of http-fetch output");
 
		if (read_in_full(cmd.out, packname,
				 the_hash_algo->hexsz + 1) < 0 ||
		    packname[the_hash_algo->hexsz] != '\n')
			die("fetch-pack: expected hash then LF at end of http-fetch output");
 
		packname[the_hash_algo->hexsz] = '\0';
 
		close(cmd.out);
 
		if (finish_command(&cmd))
			die("fetch-pack: unable to finish http-fetch");
 
		if (memcmp(packfile_uris.items[i].string, packname,
			   the_hash_algo->hexsz))
			die("fetch-pack: pack downloaded from %s does not match expected hash %.*s",
			    uri, (int) the_hash_algo->hexsz,
			    packfile_uris.items[i].string);
 
		string_list_append_nodup(pack_lockfiles,
					 xstrfmt("%s/pack/pack-%s.keep",
						 get_object_directory(),
						 packname));
	}
	string_list_clear(&packfile_uris, 0);
 
	if (negotiator)
		negotiator->release(negotiator);
 
	oidset_clear(&common);
	return ref;
}
 
static int fetch_pack_config_cb(const char *var, const char *value, void *cb)
{
	if (strcmp(var, "fetch.fsck.skiplist") == 0) {
		const char *path;
 
		if (git_config_pathname(&path, var, value))
			return 1;
		strbuf_addf(&fsck_msg_types, "%cskiplist=%s",
			fsck_msg_types.len ? ',' : '=', path);
		free((char *)path);
		return 0;
	}
 
	if (skip_prefix(var, "fetch.fsck.", &var)) {
		if (is_valid_msg_type(var, value))
			strbuf_addf(&fsck_msg_types, "%c%s=%s",
				fsck_msg_types.len ? ',' : '=', var, value);
		else
			warning("Skipping unknown msg id '%s'", var);
		return 0;
	}
 
	return git_default_config(var, value, cb);
}
 
static void fetch_pack_config(void)
{
	git_config_get_int("fetch.unpacklimit", &fetch_unpack_limit);
	git_config_get_int("transfer.unpacklimit", &transfer_unpack_limit);
	git_config_get_bool("repack.usedeltabaseoffset", &prefer_ofs_delta);
	git_config_get_bool("fetch.fsckobjects", &fetch_fsck_objects);
	git_config_get_bool("transfer.fsckobjects", &transfer_fsck_objects);
	if (!uri_protocols.nr) {
		char *str;
 
		if (!git_config_get_string("fetch.uriprotocols", &str) && str) {
			string_list_split(&uri_protocols, str, ',', -1);
			free(str);
		}
	}
 
	git_config(fetch_pack_config_cb, NULL);
}
 
static void fetch_pack_setup(void)
{
	static int did_setup;
	if (did_setup)
		return;
	fetch_pack_config();
	if (0 <= transfer_unpack_limit)
		unpack_limit = transfer_unpack_limit;
	else if (0 <= fetch_unpack_limit)
		unpack_limit = fetch_unpack_limit;
	did_setup = 1;
}
 
static int remove_duplicates_in_refs(struct ref **ref, int nr)
{
	struct string_list names = STRING_LIST_INIT_NODUP;
	int src, dst;
 
	for (src = dst = 0; src < nr; src++) {
		struct string_list_item *item;
		item = string_list_insert(&names, ref[src]->name);
		if (item->util)
			continue; /* already have it */
		item->util = ref[src];
		if (src != dst)
			ref[dst] = ref[src];
		dst++;
	}
	for (src = dst; src < nr; src++)
		ref[src] = NULL;
	string_list_clear(&names, 0);
	return dst;
}
 
static void update_shallow(struct fetch_pack_args *args,
			   struct ref **sought, int nr_sought,
			   struct shallow_info *si)
{
	struct oid_array ref = OID_ARRAY_INIT;
	int *status;
	int i;
 
	if (args->deepen && alternate_shallow_file) {
		if (*alternate_shallow_file == '\0') { /* --unshallow */
			unlink_or_warn(git_path_shallow(the_repository));
			rollback_shallow_file(the_repository, &shallow_lock);
		} else
			commit_shallow_file(the_repository, &shallow_lock);
		alternate_shallow_file = NULL;
		return;
	}
 
	if (!si->shallow || !si->shallow->nr)
		return;
 
	if (args->cloning) {
		/*
		 * remote is shallow, but this is a clone, there are
		 * no objects in repo to worry about. Accept any
		 * shallow points that exist in the pack (iow in repo
		 * after get_pack() and reprepare_packed_git())
		 */
		struct oid_array extra = OID_ARRAY_INIT;
		struct object_id *oid = si->shallow->oid;
		for (i = 0; i < si->shallow->nr; i++)
			if (has_object_file(&oid[i]))
				oid_array_append(&extra, &oid[i]);
		if (extra.nr) {
			setup_alternate_shallow(&shallow_lock,
						&alternate_shallow_file,
						&extra);
			commit_shallow_file(the_repository, &shallow_lock);
			alternate_shallow_file = NULL;
		}
		oid_array_clear(&extra);
		return;
	}
 
	if (!si->nr_ours && !si->nr_theirs)
		return;
 
	remove_nonexistent_theirs_shallow(si);
	if (!si->nr_ours && !si->nr_theirs)
		return;
	for (i = 0; i < nr_sought; i++)
		oid_array_append(&ref, &sought[i]->old_oid);
	si->ref = &ref;
 
	if (args->update_shallow) {
		/*
		 * remote is also shallow, .git/shallow may be updated
		 * so all refs can be accepted. Make sure we only add
		 * shallow roots that are actually reachable from new
		 * refs.
		 */
		struct oid_array extra = OID_ARRAY_INIT;
		struct object_id *oid = si->shallow->oid;
		assign_shallow_commits_to_refs(si, NULL, NULL);
		if (!si->nr_ours && !si->nr_theirs) {
			oid_array_clear(&ref);
			return;
		}
		for (i = 0; i < si->nr_ours; i++)
			oid_array_append(&extra, &oid[si->ours[i]]);
		for (i = 0; i < si->nr_theirs; i++)
			oid_array_append(&extra, &oid[si->theirs[i]]);
		setup_alternate_shallow(&shallow_lock,
					&alternate_shallow_file,
					&extra);
		commit_shallow_file(the_repository, &shallow_lock);
		oid_array_clear(&extra);
		oid_array_clear(&ref);
		alternate_shallow_file = NULL;
		return;
	}
 
	/*
	 * remote is also shallow, check what ref is safe to update
	 * without updating .git/shallow
	 */
	status = xcalloc(nr_sought, sizeof(*status));
	assign_shallow_commits_to_refs(si, NULL, status);
	if (si->nr_ours || si->nr_theirs) {
		for (i = 0; i < nr_sought; i++)
			if (status[i])
				sought[i]->status = REF_STATUS_REJECT_SHALLOW;
	}
	free(status);
	oid_array_clear(&ref);
}
 
static int iterate_ref_map(void *cb_data, struct object_id *oid)
{
	struct ref **rm = cb_data;
	struct ref *ref = *rm;
 
	if (!ref)
		return -1; /* end of the list */
	*rm = ref->next;
	oidcpy(oid, &ref->old_oid);
	return 0;
}
 
struct ref *fetch_pack(struct fetch_pack_args *args,
		       int fd[],
		       const struct ref *ref,
		       struct ref **sought, int nr_sought,
		       struct oid_array *shallow,
		       struct string_list *pack_lockfiles,
		       enum protocol_version version)
{
	struct ref *ref_cpy;
	struct shallow_info si;
	struct oid_array shallows_scratch = OID_ARRAY_INIT;
 
	fetch_pack_setup();
	if (nr_sought)
		nr_sought = remove_duplicates_in_refs(sought, nr_sought);
 
	if (version != protocol_v2 && !ref) {
		packet_flush(fd[1]);
		die(_("no matching remote head"));
	}
	if (version == protocol_v2) {
		if (shallow->nr)
			BUG("Protocol V2 does not provide shallows at this point in the fetch");
		memset(&si, 0, sizeof(si));
		ref_cpy = do_fetch_pack_v2(args, fd, ref, sought, nr_sought,
					   &shallows_scratch, &si,
					   pack_lockfiles);
	} else {
		prepare_shallow_info(&si, shallow);
		ref_cpy = do_fetch_pack(args, fd, ref, sought, nr_sought,
					&si, pack_lockfiles);
	}
	reprepare_packed_git(the_repository);
 
	if (!args->cloning && args->deepen) {
		struct check_connected_options opt = CHECK_CONNECTED_INIT;
		struct ref *iterator = ref_cpy;
		opt.shallow_file = alternate_shallow_file;
		if (args->deepen)
			opt.is_deepening_fetch = 1;
		if (check_connected(iterate_ref_map, &iterator, &opt)) {
			error(_("remote did not send all necessary objects"));
			free_refs(ref_cpy);
			ref_cpy = NULL;
			rollback_shallow_file(the_repository, &shallow_lock);
			goto cleanup;
		}
		args->connectivity_checked = 1;
	}
 
	update_shallow(args, sought, nr_sought, &si);
cleanup:
	clear_shallow_info(&si);
	oid_array_clear(&shallows_scratch);
	return ref_cpy;
}
 
int report_unmatched_refs(struct ref **sought, int nr_sought)
{
	int i, ret = 0;
 
	for (i = 0; i < nr_sought; i++) {
		if (!sought[i])
			continue;
		switch (sought[i]->match_status) {
		case REF_MATCHED:
			continue;
		case REF_NOT_MATCHED:
			error(_("no such remote ref %s"), sought[i]->name);
			break;
		case REF_UNADVERTISED_NOT_ALLOWED:
			error(_("Server does not allow request for unadvertised object %s"),
			      sought[i]->name);
			break;
		}
		ret = 1;
	}
	return ret;
}