git@vger.kernel.org list mirror (unofficial, one of many)
 help / color / Atom feed
d393e947e699bb1d5764f42e94919218496a138d blob 53722 bytes (raw)

   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
1948
1949
1950
1951
1952
1953
1954
1955
1956
1957
1958
1959
1960
1961
1962
1963
1964
1965
1966
1967
1968
1969
1970
1971
1972
1973
1974
1975
1976
1977
1978
1979
1980
1981
1982
1983
1984
 
#define NO_THE_INDEX_COMPATIBILITY_MACROS

#include "cache.h"
#include "repository.h"
#include "config.h"
#include "submodule-config.h"
#include "submodule.h"
#include "dir.h"
#include "diff.h"
#include "commit.h"
#include "revision.h"
#include "run-command.h"
#include "diffcore.h"
#include "refs.h"
#include "string-list.h"
#include "sha1-array.h"
#include "argv-array.h"
#include "blob.h"
#include "thread-utils.h"
#include "quote.h"
#include "remote.h"
#include "worktree.h"
#include "parse-options.h"
#include "object-store.h"
#include "commit-reach.h"

static int config_update_recurse_submodules = RECURSE_SUBMODULES_OFF;
static struct string_list changed_submodule_names = STRING_LIST_INIT_DUP;
static int initialized_fetch_ref_tips;
static struct oid_array ref_tips_before_fetch;
static struct oid_array ref_tips_after_fetch;

/*
 * Check if the .gitmodules file is unmerged. Parsing of the .gitmodules file
 * will be disabled because we can't guess what might be configured in
 * .gitmodules unless the user resolves the conflict.
 */
int is_gitmodules_unmerged(const struct index_state *istate)
{
	int pos = index_name_pos(istate, GITMODULES_FILE, strlen(GITMODULES_FILE));
	if (pos < 0) { /* .gitmodules not found or isn't merged */
		pos = -1 - pos;
		if (istate->cache_nr > pos) {  /* there is a .gitmodules */
			const struct cache_entry *ce = istate->cache[pos];
			if (ce_namelen(ce) == strlen(GITMODULES_FILE) &&
			    !strcmp(ce->name, GITMODULES_FILE))
				return 1;
		}
	}

	return 0;
}

/*
 * Check if the .gitmodules file is safe to write.
 *
 * Writing to the .gitmodules file requires that the file exists in the
 * working tree or, if it doesn't, that a brand new .gitmodules file is going
 * to be created (i.e. it's neither in the index nor in the current branch).
 *
 * It is not safe to write to .gitmodules if it's not in the working tree but
 * it is in the index or in the current branch, because writing new values
 * (and staging them) would blindly overwrite ALL the old content.
 */
int is_writing_gitmodules_ok(void)
{
	struct object_id oid;
	return file_exists(GITMODULES_FILE) ||
		(get_oid(GITMODULES_INDEX, &oid) < 0 && get_oid(GITMODULES_HEAD, &oid) < 0);
}

/*
 * Check if the .gitmodules file has unstaged modifications.  This must be
 * checked before allowing modifications to the .gitmodules file with the
 * intention to stage them later, because when continuing we would stage the
 * modifications the user didn't stage herself too. That might change in a
 * future version when we learn to stage the changes we do ourselves without
 * staging any previous modifications.
 */
int is_staging_gitmodules_ok(struct index_state *istate)
{
	int pos = index_name_pos(istate, GITMODULES_FILE, strlen(GITMODULES_FILE));

	if ((pos >= 0) && (pos < istate->cache_nr)) {
		struct stat st;
		if (lstat(GITMODULES_FILE, &st) == 0 &&
		    ie_match_stat(istate, istate->cache[pos], &st, 0) & DATA_CHANGED)
			return 0;
	}

	return 1;
}

static int for_each_remote_ref_submodule(const char *submodule,
					 each_ref_fn fn, void *cb_data)
{
	return refs_for_each_remote_ref(get_submodule_ref_store(submodule),
					fn, cb_data);
}

/*
 * Try to update the "path" entry in the "submodule.<name>" section of the
 * .gitmodules file. Return 0 only if a .gitmodules file was found, a section
 * with the correct path=<oldpath> setting was found and we could update it.
 */
int update_path_in_gitmodules(const char *oldpath, const char *newpath)
{
	struct strbuf entry = STRBUF_INIT;
	const struct submodule *submodule;
	int ret;

	if (!file_exists(GITMODULES_FILE)) /* Do nothing without .gitmodules */
		return -1;

	if (is_gitmodules_unmerged(the_repository->index))
		die(_("Cannot change unmerged .gitmodules, resolve merge conflicts first"));

	submodule = submodule_from_path(the_repository, &null_oid, oldpath);
	if (!submodule || !submodule->name) {
		warning(_("Could not find section in .gitmodules where path=%s"), oldpath);
		return -1;
	}
	strbuf_addstr(&entry, "submodule.");
	strbuf_addstr(&entry, submodule->name);
	strbuf_addstr(&entry, ".path");
	ret = config_set_in_gitmodules_file_gently(entry.buf, newpath);
	strbuf_release(&entry);
	return ret;
}

/*
 * Try to remove the "submodule.<name>" section from .gitmodules where the given
 * path is configured. Return 0 only if a .gitmodules file was found, a section
 * with the correct path=<path> setting was found and we could remove it.
 */
int remove_path_from_gitmodules(const char *path)
{
	struct strbuf sect = STRBUF_INIT;
	const struct submodule *submodule;

	if (!file_exists(GITMODULES_FILE)) /* Do nothing without .gitmodules */
		return -1;

	if (is_gitmodules_unmerged(the_repository->index))
		die(_("Cannot change unmerged .gitmodules, resolve merge conflicts first"));

	submodule = submodule_from_path(the_repository, &null_oid, path);
	if (!submodule || !submodule->name) {
		warning(_("Could not find section in .gitmodules where path=%s"), path);
		return -1;
	}
	strbuf_addstr(&sect, "submodule.");
	strbuf_addstr(&sect, submodule->name);
	if (git_config_rename_section_in_file(GITMODULES_FILE, sect.buf, NULL) < 0) {
		/* Maybe the user already did that, don't error out here */
		warning(_("Could not remove .gitmodules entry for %s"), path);
		strbuf_release(&sect);
		return -1;
	}
	strbuf_release(&sect);
	return 0;
}

void stage_updated_gitmodules(struct index_state *istate)
{
	if (add_file_to_index(istate, GITMODULES_FILE, 0))
		die(_("staging updated .gitmodules failed"));
}

/* TODO: remove this function, use repo_submodule_init instead. */
int add_submodule_odb(const char *path)
{
	struct strbuf objects_directory = STRBUF_INIT;
	int ret = 0;

	ret = strbuf_git_path_submodule(&objects_directory, path, "objects/");
	if (ret)
		goto done;
	if (!is_directory(objects_directory.buf)) {
		ret = -1;
		goto done;
	}
	add_to_alternates_memory(objects_directory.buf);
done:
	strbuf_release(&objects_directory);
	return ret;
}

void set_diffopt_flags_from_submodule_config(struct diff_options *diffopt,
					     const char *path)
{
	const struct submodule *submodule = submodule_from_path(the_repository,
								&null_oid, path);
	if (submodule) {
		const char *ignore;
		char *key;

		key = xstrfmt("submodule.%s.ignore", submodule->name);
		if (repo_config_get_string_const(the_repository, key, &ignore))
			ignore = submodule->ignore;
		free(key);

		if (ignore)
			handle_ignore_submodules_arg(diffopt, ignore);
		else if (is_gitmodules_unmerged(the_repository->index))
			diffopt->flags.ignore_submodules = 1;
	}
}

/* Cheap function that only determines if we're interested in submodules at all */
int git_default_submodule_config(const char *var, const char *value, void *cb)
{
	if (!strcmp(var, "submodule.recurse")) {
		int v = git_config_bool(var, value) ?
			RECURSE_SUBMODULES_ON : RECURSE_SUBMODULES_OFF;
		config_update_recurse_submodules = v;
	}
	return 0;
}

int option_parse_recurse_submodules_worktree_updater(const struct option *opt,
						     const char *arg, int unset)
{
	if (unset) {
		config_update_recurse_submodules = RECURSE_SUBMODULES_OFF;
		return 0;
	}
	if (arg)
		config_update_recurse_submodules =
			parse_update_recurse_submodules_arg(opt->long_name,
							    arg);
	else
		config_update_recurse_submodules = RECURSE_SUBMODULES_ON;

	return 0;
}

/*
 * Determine if a submodule has been initialized at a given 'path'
 */
int is_submodule_active(struct repository *repo, const char *path)
{
	int ret = 0;
	char *key = NULL;
	char *value = NULL;
	const struct string_list *sl;
	const struct submodule *module;

	module = submodule_from_path(repo, &null_oid, path);

	/* early return if there isn't a path->module mapping */
	if (!module)
		return 0;

	/* submodule.<name>.active is set */
	key = xstrfmt("submodule.%s.active", module->name);
	if (!repo_config_get_bool(repo, key, &ret)) {
		free(key);
		return ret;
	}
	free(key);

	/* submodule.active is set */
	sl = repo_config_get_value_multi(repo, "submodule.active");
	if (sl) {
		struct pathspec ps;
		struct argv_array args = ARGV_ARRAY_INIT;
		const struct string_list_item *item;

		for_each_string_list_item(item, sl) {
			argv_array_push(&args, item->string);
		}

		parse_pathspec(&ps, 0, 0, NULL, args.argv);
		ret = match_pathspec(repo->index, &ps, path, strlen(path), 0, NULL, 1);

		argv_array_clear(&args);
		clear_pathspec(&ps);
		return ret;
	}

	/* fallback to checking if the URL is set */
	key = xstrfmt("submodule.%s.url", module->name);
	ret = !repo_config_get_string(repo, key, &value);

	free(value);
	free(key);
	return ret;
}

int is_submodule_populated_gently(const char *path, int *return_error_code)
{
	int ret = 0;
	char *gitdir = xstrfmt("%s/.git", path);

	if (resolve_gitdir_gently(gitdir, return_error_code))
		ret = 1;

	free(gitdir);
	return ret;
}

/*
 * Dies if the provided 'prefix' corresponds to an unpopulated submodule
 */
void die_in_unpopulated_submodule(const struct index_state *istate,
				  const char *prefix)
{
	int i, prefixlen;

	if (!prefix)
		return;

	prefixlen = strlen(prefix);

	for (i = 0; i < istate->cache_nr; i++) {
		struct cache_entry *ce = istate->cache[i];
		int ce_len = ce_namelen(ce);

		if (!S_ISGITLINK(ce->ce_mode))
			continue;
		if (prefixlen <= ce_len)
			continue;
		if (strncmp(ce->name, prefix, ce_len))
			continue;
		if (prefix[ce_len] != '/')
			continue;

		die(_("in unpopulated submodule '%s'"), ce->name);
	}
}

/*
 * Dies if any paths in the provided pathspec descends into a submodule
 */
void die_path_inside_submodule(const struct index_state *istate,
			       const struct pathspec *ps)
{
	int i, j;

	for (i = 0; i < istate->cache_nr; i++) {
		struct cache_entry *ce = istate->cache[i];
		int ce_len = ce_namelen(ce);

		if (!S_ISGITLINK(ce->ce_mode))
			continue;

		for (j = 0; j < ps->nr ; j++) {
			const struct pathspec_item *item = &ps->items[j];

			if (item->len <= ce_len)
				continue;
			if (item->match[ce_len] != '/')
				continue;
			if (strncmp(ce->name, item->match, ce_len))
				continue;
			if (item->len == ce_len + 1)
				continue;

			die(_("Pathspec '%s' is in submodule '%.*s'"),
			    item->original, ce_len, ce->name);
		}
	}
}

enum submodule_update_type parse_submodule_update_type(const char *value)
{
	if (!strcmp(value, "none"))
		return SM_UPDATE_NONE;
	else if (!strcmp(value, "checkout"))
		return SM_UPDATE_CHECKOUT;
	else if (!strcmp(value, "rebase"))
		return SM_UPDATE_REBASE;
	else if (!strcmp(value, "merge"))
		return SM_UPDATE_MERGE;
	else if (*value == '!')
		return SM_UPDATE_COMMAND;
	else
		return SM_UPDATE_UNSPECIFIED;
}

int parse_submodule_update_strategy(const char *value,
		struct submodule_update_strategy *dst)
{
	enum submodule_update_type type;

	free((void*)dst->command);
	dst->command = NULL;

	type = parse_submodule_update_type(value);
	if (type == SM_UPDATE_UNSPECIFIED)
		return -1;

	dst->type = type;
	if (type == SM_UPDATE_COMMAND)
		dst->command = xstrdup(value + 1);

	return 0;
}

const char *submodule_strategy_to_string(const struct submodule_update_strategy *s)
{
	struct strbuf sb = STRBUF_INIT;
	switch (s->type) {
	case SM_UPDATE_CHECKOUT:
		return "checkout";
	case SM_UPDATE_MERGE:
		return "merge";
	case SM_UPDATE_REBASE:
		return "rebase";
	case SM_UPDATE_NONE:
		return "none";
	case SM_UPDATE_UNSPECIFIED:
		return NULL;
	case SM_UPDATE_COMMAND:
		strbuf_addf(&sb, "!%s", s->command);
		return strbuf_detach(&sb, NULL);
	}
	return NULL;
}

void handle_ignore_submodules_arg(struct diff_options *diffopt,
				  const char *arg)
{
	diffopt->flags.ignore_submodules = 0;
	diffopt->flags.ignore_untracked_in_submodules = 0;
	diffopt->flags.ignore_dirty_submodules = 0;

	if (!strcmp(arg, "all"))
		diffopt->flags.ignore_submodules = 1;
	else if (!strcmp(arg, "untracked"))
		diffopt->flags.ignore_untracked_in_submodules = 1;
	else if (!strcmp(arg, "dirty"))
		diffopt->flags.ignore_dirty_submodules = 1;
	else if (strcmp(arg, "none"))
		die("bad --ignore-submodules argument: %s", arg);
}

static int prepare_submodule_summary(struct rev_info *rev, const char *path,
		struct commit *left, struct commit *right,
		struct commit_list *merge_bases)
{
	struct commit_list *list;

	repo_init_revisions(the_repository, rev, NULL);
	setup_revisions(0, NULL, rev, NULL);
	rev->left_right = 1;
	rev->first_parent_only = 1;
	left->object.flags |= SYMMETRIC_LEFT;
	add_pending_object(rev, &left->object, path);
	add_pending_object(rev, &right->object, path);
	for (list = merge_bases; list; list = list->next) {
		list->item->object.flags |= UNINTERESTING;
		add_pending_object(rev, &list->item->object,
			oid_to_hex(&list->item->object.oid));
	}
	return prepare_revision_walk(rev);
}

static void print_submodule_summary(struct rev_info *rev, struct diff_options *o)
{
	static const char format[] = "  %m %s";
	struct strbuf sb = STRBUF_INIT;
	struct commit *commit;

	while ((commit = get_revision(rev))) {
		struct pretty_print_context ctx = {0};
		ctx.date_mode = rev->date_mode;
		ctx.output_encoding = get_log_output_encoding();
		strbuf_setlen(&sb, 0);
		format_commit_message(commit, format, &sb, &ctx);
		strbuf_addch(&sb, '\n');
		if (commit->object.flags & SYMMETRIC_LEFT)
			diff_emit_submodule_del(o, sb.buf);
		else
			diff_emit_submodule_add(o, sb.buf);
	}
	strbuf_release(&sb);
}

static void prepare_submodule_repo_env_no_git_dir(struct argv_array *out)
{
	const char * const *var;

	for (var = local_repo_env; *var; var++) {
		if (strcmp(*var, CONFIG_DATA_ENVIRONMENT))
			argv_array_push(out, *var);
	}
}

void prepare_submodule_repo_env(struct argv_array *out)
{
	prepare_submodule_repo_env_no_git_dir(out);
	argv_array_pushf(out, "%s=%s", GIT_DIR_ENVIRONMENT,
			 DEFAULT_GIT_DIR_ENVIRONMENT);
}

/* Helper function to display the submodule header line prior to the full
 * summary output. If it can locate the submodule objects directory it will
 * attempt to lookup both the left and right commits and put them into the
 * left and right pointers.
 */
static void show_submodule_header(struct diff_options *o, const char *path,
		struct object_id *one, struct object_id *two,
		unsigned dirty_submodule,
		struct commit **left, struct commit **right,
		struct commit_list **merge_bases)
{
	const char *message = NULL;
	struct strbuf sb = STRBUF_INIT;
	int fast_forward = 0, fast_backward = 0;

	if (dirty_submodule & DIRTY_SUBMODULE_UNTRACKED)
		diff_emit_submodule_untracked(o, path);

	if (dirty_submodule & DIRTY_SUBMODULE_MODIFIED)
		diff_emit_submodule_modified(o, path);

	if (is_null_oid(one))
		message = "(new submodule)";
	else if (is_null_oid(two))
		message = "(submodule deleted)";

	if (add_submodule_odb(path)) {
		if (!message)
			message = "(commits not present)";
		goto output_header;
	}

	/*
	 * Attempt to lookup the commit references, and determine if this is
	 * a fast forward or fast backwards update.
	 */
	*left = lookup_commit_reference(the_repository, one);
	*right = lookup_commit_reference(the_repository, two);

	/*
	 * Warn about missing commits in the submodule project, but only if
	 * they aren't null.
	 */
	if ((!is_null_oid(one) && !*left) ||
	     (!is_null_oid(two) && !*right))
		message = "(commits not present)";

	*merge_bases = get_merge_bases(*left, *right);
	if (*merge_bases) {
		if ((*merge_bases)->item == *left)
			fast_forward = 1;
		else if ((*merge_bases)->item == *right)
			fast_backward = 1;
	}

	if (oideq(one, two)) {
		strbuf_release(&sb);
		return;
	}

output_header:
	strbuf_addf(&sb, "Submodule %s ", path);
	strbuf_add_unique_abbrev(&sb, one, DEFAULT_ABBREV);
	strbuf_addstr(&sb, (fast_backward || fast_forward) ? ".." : "...");
	strbuf_add_unique_abbrev(&sb, two, DEFAULT_ABBREV);
	if (message)
		strbuf_addf(&sb, " %s\n", message);
	else
		strbuf_addf(&sb, "%s:\n", fast_backward ? " (rewind)" : "");
	diff_emit_submodule_header(o, sb.buf);

	strbuf_release(&sb);
}

void show_submodule_summary(struct diff_options *o, const char *path,
		struct object_id *one, struct object_id *two,
		unsigned dirty_submodule)
{
	struct rev_info rev;
	struct commit *left = NULL, *right = NULL;
	struct commit_list *merge_bases = NULL;

	show_submodule_header(o, path, one, two, dirty_submodule,
			      &left, &right, &merge_bases);

	/*
	 * If we don't have both a left and a right pointer, there is no
	 * reason to try and display a summary. The header line should contain
	 * all the information the user needs.
	 */
	if (!left || !right)
		goto out;

	/* Treat revision walker failure the same as missing commits */
	if (prepare_submodule_summary(&rev, path, left, right, merge_bases)) {
		diff_emit_submodule_error(o, "(revision walker failed)\n");
		goto out;
	}

	print_submodule_summary(&rev, o);

out:
	if (merge_bases)
		free_commit_list(merge_bases);
	clear_commit_marks(left, ~0);
	clear_commit_marks(right, ~0);
}

void show_submodule_inline_diff(struct diff_options *o, const char *path,
		struct object_id *one, struct object_id *two,
		unsigned dirty_submodule)
{
	const struct object_id *old_oid = the_hash_algo->empty_tree, *new_oid = the_hash_algo->empty_tree;
	struct commit *left = NULL, *right = NULL;
	struct commit_list *merge_bases = NULL;
	struct child_process cp = CHILD_PROCESS_INIT;
	struct strbuf sb = STRBUF_INIT;

	show_submodule_header(o, path, one, two, dirty_submodule,
			      &left, &right, &merge_bases);

	/* We need a valid left and right commit to display a difference */
	if (!(left || is_null_oid(one)) ||
	    !(right || is_null_oid(two)))
		goto done;

	if (left)
		old_oid = one;
	if (right)
		new_oid = two;

	cp.git_cmd = 1;
	cp.dir = path;
	cp.out = -1;
	cp.no_stdin = 1;

	/* TODO: other options may need to be passed here. */
	argv_array_pushl(&cp.args, "diff", "--submodule=diff", NULL);
	argv_array_pushf(&cp.args, "--color=%s", want_color(o->use_color) ?
			 "always" : "never");

	if (o->flags.reverse_diff) {
		argv_array_pushf(&cp.args, "--src-prefix=%s%s/",
				 o->b_prefix, path);
		argv_array_pushf(&cp.args, "--dst-prefix=%s%s/",
				 o->a_prefix, path);
	} else {
		argv_array_pushf(&cp.args, "--src-prefix=%s%s/",
				 o->a_prefix, path);
		argv_array_pushf(&cp.args, "--dst-prefix=%s%s/",
				 o->b_prefix, path);
	}
	argv_array_push(&cp.args, oid_to_hex(old_oid));
	/*
	 * If the submodule has modified content, we will diff against the
	 * work tree, under the assumption that the user has asked for the
	 * diff format and wishes to actually see all differences even if they
	 * haven't yet been committed to the submodule yet.
	 */
	if (!(dirty_submodule & DIRTY_SUBMODULE_MODIFIED))
		argv_array_push(&cp.args, oid_to_hex(new_oid));

	prepare_submodule_repo_env(&cp.env_array);
	if (start_command(&cp))
		diff_emit_submodule_error(o, "(diff failed)\n");

	while (strbuf_getwholeline_fd(&sb, cp.out, '\n') != EOF)
		diff_emit_submodule_pipethrough(o, sb.buf, sb.len);

	if (finish_command(&cp))
		diff_emit_submodule_error(o, "(diff failed)\n");

done:
	strbuf_release(&sb);
	if (merge_bases)
		free_commit_list(merge_bases);
	if (left)
		clear_commit_marks(left, ~0);
	if (right)
		clear_commit_marks(right, ~0);
}

int should_update_submodules(void)
{
	return config_update_recurse_submodules == RECURSE_SUBMODULES_ON;
}

const struct submodule *submodule_from_ce(const struct cache_entry *ce)
{
	if (!S_ISGITLINK(ce->ce_mode))
		return NULL;

	if (!should_update_submodules())
		return NULL;

	return submodule_from_path(the_repository, &null_oid, ce->name);
}

static struct oid_array *submodule_commits(struct string_list *submodules,
					   const char *name)
{
	struct string_list_item *item;

	item = string_list_insert(submodules, name);
	if (item->util)
		return (struct oid_array *) item->util;

	/* NEEDSWORK: should we have oid_array_init()? */
	item->util = xcalloc(1, sizeof(struct oid_array));
	return (struct oid_array *) item->util;
}

struct collect_changed_submodules_cb_data {
	struct repository *repo;
	struct string_list *changed;
	const struct object_id *commit_oid;
};

/*
 * this would normally be two functions: default_name_from_path() and
 * path_from_default_name(). Since the default name is the same as
 * the submodule path we can get away with just one function which only
 * checks whether there is a submodule in the working directory at that
 * location.
 */
static const char *default_name_or_path(const char *path_or_name)
{
	int error_code;

	if (!is_submodule_populated_gently(path_or_name, &error_code))
		return NULL;

	return path_or_name;
}

static void collect_changed_submodules_cb(struct diff_queue_struct *q,
					  struct diff_options *options,
					  void *data)
{
	struct collect_changed_submodules_cb_data *me = data;
	struct string_list *changed = me->changed;
	const struct object_id *commit_oid = me->commit_oid;
	int i;

	for (i = 0; i < q->nr; i++) {
		struct diff_filepair *p = q->queue[i];
		struct oid_array *commits;
		const struct submodule *submodule;
		const char *name;

		if (!S_ISGITLINK(p->two->mode))
			continue;

		submodule = submodule_from_path(me->repo,
						commit_oid, p->two->path);
		if (submodule)
			name = submodule->name;
		else {
			name = default_name_or_path(p->two->path);
			/* make sure name does not collide with existing one */
			if (name)
				submodule = submodule_from_name(me->repo,
								commit_oid, name);
			if (submodule) {
				warning("Submodule in commit %s at path: "
					"'%s' collides with a submodule named "
					"the same. Skipping it.",
					oid_to_hex(commit_oid), p->two->path);
				name = NULL;
			}
		}

		if (!name)
			continue;

		commits = submodule_commits(changed, name);
		oid_array_append(commits, &p->two->oid);
	}
}

/*
 * Collect the paths of submodules in 'changed' which have changed based on
 * the revisions as specified in 'argv'.  Each entry in 'changed' will also
 * have a corresponding 'struct oid_array' (in the 'util' field) which lists
 * what the submodule pointers were updated to during the change.
 */
static void collect_changed_submodules(struct repository *r,
				       struct string_list *changed,
				       struct argv_array *argv)
{
	struct rev_info rev;
	const struct commit *commit;

	repo_init_revisions(r, &rev, NULL);
	setup_revisions(argv->argc, argv->argv, &rev, NULL);
	if (prepare_revision_walk(&rev))
		die("revision walk setup failed");

	while ((commit = get_revision(&rev))) {
		struct rev_info diff_rev;
		struct collect_changed_submodules_cb_data data;
		data.repo = r;
		data.changed = changed;
		data.commit_oid = &commit->object.oid;

		repo_init_revisions(r, &diff_rev, NULL);
		diff_rev.diffopt.output_format |= DIFF_FORMAT_CALLBACK;
		diff_rev.diffopt.format_callback = collect_changed_submodules_cb;
		diff_rev.diffopt.format_callback_data = &data;
		diff_tree_combined_merge(commit, 1, &diff_rev);
	}

	reset_revision_walk();
}

static void free_submodules_oids(struct string_list *submodules)
{
	struct string_list_item *item;
	for_each_string_list_item(item, submodules)
		oid_array_clear((struct oid_array *) item->util);
	string_list_clear(submodules, 1);
}

static int has_remote(const char *refname, const struct object_id *oid,
		      int flags, void *cb_data)
{
	return 1;
}

static int append_oid_to_argv(const struct object_id *oid, void *data)
{
	struct argv_array *argv = data;
	argv_array_push(argv, oid_to_hex(oid));
	return 0;
}

struct has_commit_data {
	struct repository *repo;
	int result;
	const char *path;
};

static int check_has_commit(const struct object_id *oid, void *data)
{
	struct has_commit_data *cb = data;

	enum object_type type = oid_object_info(cb->repo, oid, NULL);

	switch (type) {
	case OBJ_COMMIT:
		return 0;
	case OBJ_BAD:
		/*
		 * Object is missing or invalid. If invalid, an error message
		 * has already been printed.
		 */
		cb->result = 0;
		return 0;
	default:
		die(_("submodule entry '%s' (%s) is a %s, not a commit"),
		    cb->path, oid_to_hex(oid), type_name(type));
	}
}

static int submodule_has_commits(struct repository *r,
				 const char *path,
				 struct oid_array *commits)
{
	struct has_commit_data has_commit = { r, 1, path };

	/*
	 * Perform a cheap, but incorrect check for the existence of 'commits'.
	 * This is done by adding the submodule's object store to the in-core
	 * object store, and then querying for each commit's existence.  If we
	 * do not have the commit object anywhere, there is no chance we have
	 * it in the object store of the correct submodule and have it
	 * reachable from a ref, so we can fail early without spawning rev-list
	 * which is expensive.
	 */
	if (add_submodule_odb(path))
		return 0;

	oid_array_for_each_unique(commits, check_has_commit, &has_commit);

	if (has_commit.result) {
		/*
		 * Even if the submodule is checked out and the commit is
		 * present, make sure it exists in the submodule's object store
		 * and that it is reachable from a ref.
		 */
		struct child_process cp = CHILD_PROCESS_INIT;
		struct strbuf out = STRBUF_INIT;

		argv_array_pushl(&cp.args, "rev-list", "-n", "1", NULL);
		oid_array_for_each_unique(commits, append_oid_to_argv, &cp.args);
		argv_array_pushl(&cp.args, "--not", "--all", NULL);

		prepare_submodule_repo_env(&cp.env_array);
		cp.git_cmd = 1;
		cp.no_stdin = 1;
		cp.dir = path;

		if (capture_command(&cp, &out, GIT_MAX_HEXSZ + 1) || out.len)
			has_commit.result = 0;

		strbuf_release(&out);
	}

	return has_commit.result;
}

static int submodule_needs_pushing(struct repository *r,
				   const char *path,
				   struct oid_array *commits)
{
	if (!submodule_has_commits(r, path, commits))
		/*
		 * NOTE: We do consider it safe to return "no" here. The
		 * correct answer would be "We do not know" instead of
		 * "No push needed", but it is quite hard to change
		 * the submodule pointer without having the submodule
		 * around. If a user did however change the submodules
		 * without having the submodule around, this indicates
		 * an expert who knows what they are doing or a
		 * maintainer integrating work from other people. In
		 * both cases it should be safe to skip this check.
		 */
		return 0;

	if (for_each_remote_ref_submodule(path, has_remote, NULL) > 0) {
		struct child_process cp = CHILD_PROCESS_INIT;
		struct strbuf buf = STRBUF_INIT;
		int needs_pushing = 0;

		argv_array_push(&cp.args, "rev-list");
		oid_array_for_each_unique(commits, append_oid_to_argv, &cp.args);
		argv_array_pushl(&cp.args, "--not", "--remotes", "-n", "1" , NULL);

		prepare_submodule_repo_env(&cp.env_array);
		cp.git_cmd = 1;
		cp.no_stdin = 1;
		cp.out = -1;
		cp.dir = path;
		if (start_command(&cp))
			die("Could not run 'git rev-list <commits> --not --remotes -n 1' command in submodule %s",
					path);
		if (strbuf_read(&buf, cp.out, 41))
			needs_pushing = 1;
		finish_command(&cp);
		close(cp.out);
		strbuf_release(&buf);
		return needs_pushing;
	}

	return 0;
}

int find_unpushed_submodules(struct repository *r,
			     struct oid_array *commits,
			     const char *remotes_name,
			     struct string_list *needs_pushing)
{
	struct string_list submodules = STRING_LIST_INIT_DUP;
	struct string_list_item *name;
	struct argv_array argv = ARGV_ARRAY_INIT;

	/* argv.argv[0] will be ignored by setup_revisions */
	argv_array_push(&argv, "find_unpushed_submodules");
	oid_array_for_each_unique(commits, append_oid_to_argv, &argv);
	argv_array_push(&argv, "--not");
	argv_array_pushf(&argv, "--remotes=%s", remotes_name);

	collect_changed_submodules(r, &submodules, &argv);

	for_each_string_list_item(name, &submodules) {
		struct oid_array *commits = name->util;
		const struct submodule *submodule;
		const char *path = NULL;

		submodule = submodule_from_name(r, &null_oid, name->string);
		if (submodule)
			path = submodule->path;
		else
			path = default_name_or_path(name->string);

		if (!path)
			continue;

		if (submodule_needs_pushing(r, path, commits))
			string_list_insert(needs_pushing, path);
	}

	free_submodules_oids(&submodules);
	argv_array_clear(&argv);

	return needs_pushing->nr;
}

static int push_submodule(const char *path,
			  const struct remote *remote,
			  const struct refspec *rs,
			  const struct string_list *push_options,
			  int dry_run)
{
	if (add_submodule_odb(path))
		return 1;

	if (for_each_remote_ref_submodule(path, has_remote, NULL) > 0) {
		struct child_process cp = CHILD_PROCESS_INIT;
		argv_array_push(&cp.args, "push");
		if (dry_run)
			argv_array_push(&cp.args, "--dry-run");

		if (push_options && push_options->nr) {
			const struct string_list_item *item;
			for_each_string_list_item(item, push_options)
				argv_array_pushf(&cp.args, "--push-option=%s",
						 item->string);
		}

		if (remote->origin != REMOTE_UNCONFIGURED) {
			int i;
			argv_array_push(&cp.args, remote->name);
			for (i = 0; i < rs->raw_nr; i++)
				argv_array_push(&cp.args, rs->raw[i]);
		}

		prepare_submodule_repo_env(&cp.env_array);
		cp.git_cmd = 1;
		cp.no_stdin = 1;
		cp.dir = path;
		if (run_command(&cp))
			return 0;
		close(cp.out);
	}

	return 1;
}

/*
 * Perform a check in the submodule to see if the remote and refspec work.
 * Die if the submodule can't be pushed.
 */
static void submodule_push_check(const char *path, const char *head,
				 const struct remote *remote,
				 const struct refspec *rs)
{
	struct child_process cp = CHILD_PROCESS_INIT;
	int i;

	argv_array_push(&cp.args, "submodule--helper");
	argv_array_push(&cp.args, "push-check");
	argv_array_push(&cp.args, head);
	argv_array_push(&cp.args, remote->name);

	for (i = 0; i < rs->raw_nr; i++)
		argv_array_push(&cp.args, rs->raw[i]);

	prepare_submodule_repo_env(&cp.env_array);
	cp.git_cmd = 1;
	cp.no_stdin = 1;
	cp.no_stdout = 1;
	cp.dir = path;

	/*
	 * Simply indicate if 'submodule--helper push-check' failed.
	 * More detailed error information will be provided by the
	 * child process.
	 */
	if (run_command(&cp))
		die("process for submodule '%s' failed", path);
}

int push_unpushed_submodules(struct repository *r,
			     struct oid_array *commits,
			     const struct remote *remote,
			     const struct refspec *rs,
			     const struct string_list *push_options,
			     int dry_run)
{
	int i, ret = 1;
	struct string_list needs_pushing = STRING_LIST_INIT_DUP;

	if (!find_unpushed_submodules(r, commits,
				      remote->name, &needs_pushing))
		return 1;

	/*
	 * Verify that the remote and refspec can be propagated to all
	 * submodules.  This check can be skipped if the remote and refspec
	 * won't be propagated due to the remote being unconfigured (e.g. a URL
	 * instead of a remote name).
	 */
	if (remote->origin != REMOTE_UNCONFIGURED) {
		char *head;
		struct object_id head_oid;

		head = resolve_refdup("HEAD", 0, &head_oid, NULL);
		if (!head)
			die(_("Failed to resolve HEAD as a valid ref."));

		for (i = 0; i < needs_pushing.nr; i++)
			submodule_push_check(needs_pushing.items[i].string,
					     head, remote, rs);
		free(head);
	}

	/* Actually push the submodules */
	for (i = 0; i < needs_pushing.nr; i++) {
		const char *path = needs_pushing.items[i].string;
		fprintf(stderr, "Pushing submodule '%s'\n", path);
		if (!push_submodule(path, remote, rs,
				    push_options, dry_run)) {
			fprintf(stderr, "Unable to push submodule '%s'\n", path);
			ret = 0;
		}
	}

	string_list_clear(&needs_pushing, 0);

	return ret;
}

static int append_oid_to_array(const char *ref, const struct object_id *oid,
			       int flags, void *data)
{
	struct oid_array *array = data;
	oid_array_append(array, oid);
	return 0;
}

void check_for_new_submodule_commits(struct object_id *oid)
{
	if (!initialized_fetch_ref_tips) {
		for_each_ref(append_oid_to_array, &ref_tips_before_fetch);
		initialized_fetch_ref_tips = 1;
	}

	oid_array_append(&ref_tips_after_fetch, oid);
}

static void calculate_changed_submodule_paths(struct repository *r)
{
	struct argv_array argv = ARGV_ARRAY_INIT;
	struct string_list changed_submodules = STRING_LIST_INIT_DUP;
	const struct string_list_item *name;

	/* No need to check if there are no submodules configured */
	if (!submodule_from_path(r, NULL, NULL))
		return;

	argv_array_push(&argv, "--"); /* argv[0] program name */
	oid_array_for_each_unique(&ref_tips_after_fetch,
				   append_oid_to_argv, &argv);
	argv_array_push(&argv, "--not");
	oid_array_for_each_unique(&ref_tips_before_fetch,
				   append_oid_to_argv, &argv);

	/*
	 * Collect all submodules (whether checked out or not) for which new
	 * commits have been recorded upstream in "changed_submodule_names".
	 */
	collect_changed_submodules(r, &changed_submodules, &argv);

	for_each_string_list_item(name, &changed_submodules) {
		struct oid_array *commits = name->util;
		const struct submodule *submodule;
		const char *path = NULL;

		submodule = submodule_from_name(r, &null_oid, name->string);
		if (submodule)
			path = submodule->path;
		else
			path = default_name_or_path(name->string);

		if (!path)
			continue;

		if (!submodule_has_commits(r, path, commits))
			string_list_append(&changed_submodule_names, name->string);
	}

	free_submodules_oids(&changed_submodules);
	argv_array_clear(&argv);
	oid_array_clear(&ref_tips_before_fetch);
	oid_array_clear(&ref_tips_after_fetch);
	initialized_fetch_ref_tips = 0;
}

int submodule_touches_in_range(struct repository *r,
			       struct object_id *excl_oid,
			       struct object_id *incl_oid)
{
	struct string_list subs = STRING_LIST_INIT_DUP;
	struct argv_array args = ARGV_ARRAY_INIT;
	int ret;

	/* No need to check if there are no submodules configured */
	if (!submodule_from_path(r, NULL, NULL))
		return 0;

	argv_array_push(&args, "--"); /* args[0] program name */
	argv_array_push(&args, oid_to_hex(incl_oid));
	if (!is_null_oid(excl_oid)) {
		argv_array_push(&args, "--not");
		argv_array_push(&args, oid_to_hex(excl_oid));
	}

	collect_changed_submodules(r, &subs, &args);
	ret = subs.nr;

	argv_array_clear(&args);

	free_submodules_oids(&subs);
	return ret;
}

struct submodule_parallel_fetch {
	int count;
	struct argv_array args;
	struct repository *r;
	const char *prefix;
	int command_line_option;
	int default_option;
	int quiet;
	int result;
};
#define SPF_INIT {0, ARGV_ARRAY_INIT, NULL, NULL, 0, 0, 0, 0}

static int get_fetch_recurse_config(const struct submodule *submodule,
				    struct submodule_parallel_fetch *spf)
{
	if (spf->command_line_option != RECURSE_SUBMODULES_DEFAULT)
		return spf->command_line_option;

	if (submodule) {
		char *key;
		const char *value;

		int fetch_recurse = submodule->fetch_recurse;
		key = xstrfmt("submodule.%s.fetchRecurseSubmodules", submodule->name);
		if (!repo_config_get_string_const(spf->r, key, &value)) {
			fetch_recurse = parse_fetch_recurse_submodules_arg(key, value);
		}
		free(key);

		if (fetch_recurse != RECURSE_SUBMODULES_NONE)
			/* local config overrules everything except commandline */
			return fetch_recurse;
	}

	return spf->default_option;
}

static int get_next_submodule(struct child_process *cp,
			      struct strbuf *err, void *data, void **task_cb)
{
	int ret = 0;
	struct submodule_parallel_fetch *spf = data;

	for (; spf->count < spf->r->index->cache_nr; spf->count++) {
		struct strbuf submodule_path = STRBUF_INIT;
		struct strbuf submodule_git_dir = STRBUF_INIT;
		struct strbuf submodule_prefix = STRBUF_INIT;
		const struct cache_entry *ce = spf->r->index->cache[spf->count];
		const char *git_dir, *default_argv;
		const struct submodule *submodule;
		struct submodule default_submodule = SUBMODULE_INIT;

		if (!S_ISGITLINK(ce->ce_mode))
			continue;

		submodule = submodule_from_path(spf->r, &null_oid, ce->name);
		if (!submodule) {
			const char *name = default_name_or_path(ce->name);
			if (name) {
				default_submodule.path = default_submodule.name = name;
				submodule = &default_submodule;
			}
		}

		switch (get_fetch_recurse_config(submodule, spf))
		{
		default:
		case RECURSE_SUBMODULES_DEFAULT:
		case RECURSE_SUBMODULES_ON_DEMAND:
			if (!submodule || !unsorted_string_list_lookup(&changed_submodule_names,
							 submodule->name))
				continue;
			default_argv = "on-demand";
			break;
		case RECURSE_SUBMODULES_ON:
			default_argv = "yes";
			break;
		case RECURSE_SUBMODULES_OFF:
			continue;
		}

		strbuf_repo_worktree_path(&submodule_path, spf->r, "%s", ce->name);
		strbuf_addf(&submodule_git_dir, "%s/.git", submodule_path.buf);
		strbuf_addf(&submodule_prefix, "%s%s/", spf->prefix, ce->name);
		git_dir = read_gitfile(submodule_git_dir.buf);
		if (!git_dir)
			git_dir = submodule_git_dir.buf;
		if (is_directory(git_dir)) {
			child_process_init(cp);
			cp->dir = strbuf_detach(&submodule_path, NULL);
			prepare_submodule_repo_env(&cp->env_array);
			cp->git_cmd = 1;
			if (!spf->quiet)
				strbuf_addf(err, "Fetching submodule %s%s\n",
					    spf->prefix, ce->name);
			argv_array_init(&cp->args);
			argv_array_pushv(&cp->args, spf->args.argv);
			argv_array_push(&cp->args, default_argv);
			argv_array_push(&cp->args, "--submodule-prefix");
			argv_array_push(&cp->args, submodule_prefix.buf);
			ret = 1;
		}
		strbuf_release(&submodule_path);
		strbuf_release(&submodule_git_dir);
		strbuf_release(&submodule_prefix);
		if (ret) {
			spf->count++;
			return 1;
		}
	}
	return 0;
}

static int fetch_start_failure(struct strbuf *err,
			       void *cb, void *task_cb)
{
	struct submodule_parallel_fetch *spf = cb;

	spf->result = 1;

	return 0;
}

static int fetch_finish(int retvalue, struct strbuf *err,
			void *cb, void *task_cb)
{
	struct submodule_parallel_fetch *spf = cb;

	if (retvalue)
		spf->result = 1;

	return 0;
}

int fetch_populated_submodules(struct repository *r,
			       const struct argv_array *options,
			       const char *prefix, int command_line_option,
			       int default_option,
			       int quiet, int max_parallel_jobs)
{
	int i;
	struct submodule_parallel_fetch spf = SPF_INIT;

	spf.r = r;
	spf.command_line_option = command_line_option;
	spf.default_option = default_option;
	spf.quiet = quiet;
	spf.prefix = prefix;

	if (!r->worktree)
		goto out;

	if (repo_read_index(r) < 0)
		die("index file corrupt");

	argv_array_push(&spf.args, "fetch");
	for (i = 0; i < options->argc; i++)
		argv_array_push(&spf.args, options->argv[i]);
	argv_array_push(&spf.args, "--recurse-submodules-default");
	/* default value, "--submodule-prefix" and its value are added later */

	calculate_changed_submodule_paths(r);
	run_processes_parallel(max_parallel_jobs,
			       get_next_submodule,
			       fetch_start_failure,
			       fetch_finish,
			       &spf);

	argv_array_clear(&spf.args);
out:
	string_list_clear(&changed_submodule_names, 1);
	return spf.result;
}

unsigned is_submodule_modified(const char *path, int ignore_untracked)
{
	struct child_process cp = CHILD_PROCESS_INIT;
	struct strbuf buf = STRBUF_INIT;
	FILE *fp;
	unsigned dirty_submodule = 0;
	const char *git_dir;
	int ignore_cp_exit_code = 0;

	strbuf_addf(&buf, "%s/.git", path);
	git_dir = read_gitfile(buf.buf);
	if (!git_dir)
		git_dir = buf.buf;
	if (!is_git_directory(git_dir)) {
		if (is_directory(git_dir))
			die(_("'%s' not recognized as a git repository"), git_dir);
		strbuf_release(&buf);
		/* The submodule is not checked out, so it is not modified */
		return 0;
	}
	strbuf_reset(&buf);

	argv_array_pushl(&cp.args, "status", "--porcelain=2", NULL);
	if (ignore_untracked)
		argv_array_push(&cp.args, "-uno");

	prepare_submodule_repo_env(&cp.env_array);
	cp.git_cmd = 1;
	cp.no_stdin = 1;
	cp.out = -1;
	cp.dir = path;
	if (start_command(&cp))
		die("Could not run 'git status --porcelain=2' in submodule %s", path);

	fp = xfdopen(cp.out, "r");
	while (strbuf_getwholeline(&buf, fp, '\n') != EOF) {
		/* regular untracked files */
		if (buf.buf[0] == '?')
			dirty_submodule |= DIRTY_SUBMODULE_UNTRACKED;

		if (buf.buf[0] == 'u' ||
		    buf.buf[0] == '1' ||
		    buf.buf[0] == '2') {
			/* T = line type, XY = status, SSSS = submodule state */
			if (buf.len < strlen("T XY SSSS"))
				BUG("invalid status --porcelain=2 line %s",
				    buf.buf);

			if (buf.buf[5] == 'S' && buf.buf[8] == 'U')
				/* nested untracked file */
				dirty_submodule |= DIRTY_SUBMODULE_UNTRACKED;

			if (buf.buf[0] == 'u' ||
			    buf.buf[0] == '2' ||
			    memcmp(buf.buf + 5, "S..U", 4))
				/* other change */
				dirty_submodule |= DIRTY_SUBMODULE_MODIFIED;
		}

		if ((dirty_submodule & DIRTY_SUBMODULE_MODIFIED) &&
		    ((dirty_submodule & DIRTY_SUBMODULE_UNTRACKED) ||
		     ignore_untracked)) {
			/*
			 * We're not interested in any further information from
			 * the child any more, neither output nor its exit code.
			 */
			ignore_cp_exit_code = 1;
			break;
		}
	}
	fclose(fp);

	if (finish_command(&cp) && !ignore_cp_exit_code)
		die("'git status --porcelain=2' failed in submodule %s", path);

	strbuf_release(&buf);
	return dirty_submodule;
}

int submodule_uses_gitfile(const char *path)
{
	struct child_process cp = CHILD_PROCESS_INIT;
	const char *argv[] = {
		"submodule",
		"foreach",
		"--quiet",
		"--recursive",
		"test -f .git",
		NULL,
	};
	struct strbuf buf = STRBUF_INIT;
	const char *git_dir;

	strbuf_addf(&buf, "%s/.git", path);
	git_dir = read_gitfile(buf.buf);
	if (!git_dir) {
		strbuf_release(&buf);
		return 0;
	}
	strbuf_release(&buf);

	/* Now test that all nested submodules use a gitfile too */
	cp.argv = argv;
	prepare_submodule_repo_env(&cp.env_array);
	cp.git_cmd = 1;
	cp.no_stdin = 1;
	cp.no_stderr = 1;
	cp.no_stdout = 1;
	cp.dir = path;
	if (run_command(&cp))
		return 0;

	return 1;
}

/*
 * Check if it is a bad idea to remove a submodule, i.e. if we'd lose data
 * when doing so.
 *
 * Return 1 if we'd lose data, return 0 if the removal is fine,
 * and negative values for errors.
 */
int bad_to_remove_submodule(const char *path, unsigned flags)
{
	ssize_t len;
	struct child_process cp = CHILD_PROCESS_INIT;
	struct strbuf buf = STRBUF_INIT;
	int ret = 0;

	if (!file_exists(path) || is_empty_dir(path))
		return 0;

	if (!submodule_uses_gitfile(path))
		return 1;

	argv_array_pushl(&cp.args, "status", "--porcelain",
				   "--ignore-submodules=none", NULL);

	if (flags & SUBMODULE_REMOVAL_IGNORE_UNTRACKED)
		argv_array_push(&cp.args, "-uno");
	else
		argv_array_push(&cp.args, "-uall");

	if (!(flags & SUBMODULE_REMOVAL_IGNORE_IGNORED_UNTRACKED))
		argv_array_push(&cp.args, "--ignored");

	prepare_submodule_repo_env(&cp.env_array);
	cp.git_cmd = 1;
	cp.no_stdin = 1;
	cp.out = -1;
	cp.dir = path;
	if (start_command(&cp)) {
		if (flags & SUBMODULE_REMOVAL_DIE_ON_ERROR)
			die(_("could not start 'git status' in submodule '%s'"),
				path);
		ret = -1;
		goto out;
	}

	len = strbuf_read(&buf, cp.out, 1024);
	if (len > 2)
		ret = 1;
	close(cp.out);

	if (finish_command(&cp)) {
		if (flags & SUBMODULE_REMOVAL_DIE_ON_ERROR)
			die(_("could not run 'git status' in submodule '%s'"),
				path);
		ret = -1;
	}
out:
	strbuf_release(&buf);
	return ret;
}

void submodule_unset_core_worktree(const struct submodule *sub)
{
	char *config_path = xstrfmt("%s/modules/%s/config",
				    get_git_common_dir(), sub->name);

	if (git_config_set_in_file_gently(config_path, "core.worktree", NULL))
		warning(_("Could not unset core.worktree setting in submodule '%s'"),
			  sub->path);

	free(config_path);
}

static const char *get_super_prefix_or_empty(void)
{
	const char *s = get_super_prefix();
	if (!s)
		s = "";
	return s;
}

static int submodule_has_dirty_index(const struct submodule *sub)
{
	struct child_process cp = CHILD_PROCESS_INIT;

	prepare_submodule_repo_env(&cp.env_array);

	cp.git_cmd = 1;
	argv_array_pushl(&cp.args, "diff-index", "--quiet",
				   "--cached", "HEAD", NULL);
	cp.no_stdin = 1;
	cp.no_stdout = 1;
	cp.dir = sub->path;
	if (start_command(&cp))
		die("could not recurse into submodule '%s'", sub->path);

	return finish_command(&cp);
}

static void submodule_reset_index(const char *path)
{
	struct child_process cp = CHILD_PROCESS_INIT;
	prepare_submodule_repo_env(&cp.env_array);

	cp.git_cmd = 1;
	cp.no_stdin = 1;
	cp.dir = path;

	argv_array_pushf(&cp.args, "--super-prefix=%s%s/",
				   get_super_prefix_or_empty(), path);
	argv_array_pushl(&cp.args, "read-tree", "-u", "--reset", NULL);

	argv_array_push(&cp.args, empty_tree_oid_hex());

	if (run_command(&cp))
		die("could not reset submodule index");
}

/**
 * Moves a submodule at a given path from a given head to another new head.
 * For edge cases (a submodule coming into existence or removing a submodule)
 * pass NULL for old or new respectively.
 */
int submodule_move_head(const char *path,
			 const char *old_head,
			 const char *new_head,
			 unsigned flags)
{
	int ret = 0;
	struct child_process cp = CHILD_PROCESS_INIT;
	const struct submodule *sub;
	int *error_code_ptr, error_code;

	if (!is_submodule_active(the_repository, path))
		return 0;

	if (flags & SUBMODULE_MOVE_HEAD_FORCE)
		/*
		 * Pass non NULL pointer to is_submodule_populated_gently
		 * to prevent die()-ing. We'll use connect_work_tree_and_git_dir
		 * to fixup the submodule in the force case later.
		 */
		error_code_ptr = &error_code;
	else
		error_code_ptr = NULL;

	if (old_head && !is_submodule_populated_gently(path, error_code_ptr))
		return 0;

	sub = submodule_from_path(the_repository, &null_oid, path);

	if (!sub)
		BUG("could not get submodule information for '%s'", path);

	if (old_head && !(flags & SUBMODULE_MOVE_HEAD_FORCE)) {
		/* Check if the submodule has a dirty index. */
		if (submodule_has_dirty_index(sub))
			return error(_("submodule '%s' has dirty index"), path);
	}

	if (!(flags & SUBMODULE_MOVE_HEAD_DRY_RUN)) {
		if (old_head) {
			if (!submodule_uses_gitfile(path))
				absorb_git_dir_into_superproject("", path,
					ABSORB_GITDIR_RECURSE_SUBMODULES);
		} else {
			char *gitdir = xstrfmt("%s/modules/%s",
				    get_git_common_dir(), sub->name);
			connect_work_tree_and_git_dir(path, gitdir, 0);
			free(gitdir);

			/* make sure the index is clean as well */
			submodule_reset_index(path);
		}

		if (old_head && (flags & SUBMODULE_MOVE_HEAD_FORCE)) {
			char *gitdir = xstrfmt("%s/modules/%s",
				    get_git_common_dir(), sub->name);
			connect_work_tree_and_git_dir(path, gitdir, 1);
			free(gitdir);
		}
	}

	prepare_submodule_repo_env(&cp.env_array);

	cp.git_cmd = 1;
	cp.no_stdin = 1;
	cp.dir = path;

	argv_array_pushf(&cp.args, "--super-prefix=%s%s/",
			get_super_prefix_or_empty(), path);
	argv_array_pushl(&cp.args, "read-tree", "--recurse-submodules", NULL);

	if (flags & SUBMODULE_MOVE_HEAD_DRY_RUN)
		argv_array_push(&cp.args, "-n");
	else
		argv_array_push(&cp.args, "-u");

	if (flags & SUBMODULE_MOVE_HEAD_FORCE)
		argv_array_push(&cp.args, "--reset");
	else
		argv_array_push(&cp.args, "-m");

	if (!(flags & SUBMODULE_MOVE_HEAD_FORCE))
		argv_array_push(&cp.args, old_head ? old_head : empty_tree_oid_hex());

	argv_array_push(&cp.args, new_head ? new_head : empty_tree_oid_hex());

	if (run_command(&cp)) {
		ret = error(_("Submodule '%s' could not be updated."), path);
		goto out;
	}

	if (!(flags & SUBMODULE_MOVE_HEAD_DRY_RUN)) {
		if (new_head) {
			child_process_init(&cp);
			/* also set the HEAD accordingly */
			cp.git_cmd = 1;
			cp.no_stdin = 1;
			cp.dir = path;

			prepare_submodule_repo_env(&cp.env_array);
			argv_array_pushl(&cp.args, "update-ref", "HEAD",
					 "--no-deref", new_head, NULL);

			if (run_command(&cp)) {
				ret = -1;
				goto out;
			}
		} else {
			struct strbuf sb = STRBUF_INIT;

			strbuf_addf(&sb, "%s/.git", path);
			unlink_or_warn(sb.buf);
			strbuf_release(&sb);

			if (is_empty_dir(path))
				rmdir_or_warn(path);

			submodule_unset_core_worktree(sub);
		}
	}
out:
	return ret;
}

/*
 * Embeds a single submodules git directory into the superprojects git dir,
 * non recursively.
 */
static void relocate_single_git_dir_into_superproject(const char *prefix,
						      const char *path)
{
	char *old_git_dir = NULL, *real_old_git_dir = NULL, *real_new_git_dir = NULL;
	const char *new_git_dir;
	const struct submodule *sub;

	if (submodule_uses_worktrees(path))
		die(_("relocate_gitdir for submodule '%s' with "
		      "more than one worktree not supported"), path);

	old_git_dir = xstrfmt("%s/.git", path);
	if (read_gitfile(old_git_dir))
		/* If it is an actual gitfile, it doesn't need migration. */
		return;

	real_old_git_dir = real_pathdup(old_git_dir, 1);

	sub = submodule_from_path(the_repository, &null_oid, path);
	if (!sub)
		die(_("could not lookup name for submodule '%s'"), path);

	new_git_dir = git_path("modules/%s", sub->name);
	if (safe_create_leading_directories_const(new_git_dir) < 0)
		die(_("could not create directory '%s'"), new_git_dir);
	real_new_git_dir = real_pathdup(new_git_dir, 1);

	fprintf(stderr, _("Migrating git directory of '%s%s' from\n'%s' to\n'%s'\n"),
		get_super_prefix_or_empty(), path,
		real_old_git_dir, real_new_git_dir);

	relocate_gitdir(path, real_old_git_dir, real_new_git_dir);

	free(old_git_dir);
	free(real_old_git_dir);
	free(real_new_git_dir);
}

/*
 * Migrate the git directory of the submodule given by path from
 * having its git directory within the working tree to the git dir nested
 * in its superprojects git dir under modules/.
 */
void absorb_git_dir_into_superproject(const char *prefix,
				      const char *path,
				      unsigned flags)
{
	int err_code;
	const char *sub_git_dir;
	struct strbuf gitdir = STRBUF_INIT;
	strbuf_addf(&gitdir, "%s/.git", path);
	sub_git_dir = resolve_gitdir_gently(gitdir.buf, &err_code);

	/* Not populated? */
	if (!sub_git_dir) {
		const struct submodule *sub;

		if (err_code == READ_GITFILE_ERR_STAT_FAILED) {
			/* unpopulated as expected */
			strbuf_release(&gitdir);
			return;
		}

		if (err_code != READ_GITFILE_ERR_NOT_A_REPO)
			/* We don't know what broke here. */
			read_gitfile_error_die(err_code, path, NULL);

		/*
		* Maybe populated, but no git directory was found?
		* This can happen if the superproject is a submodule
		* itself and was just absorbed. The absorption of the
		* superproject did not rewrite the git file links yet,
		* fix it now.
		*/
		sub = submodule_from_path(the_repository, &null_oid, path);
		if (!sub)
			die(_("could not lookup name for submodule '%s'"), path);
		connect_work_tree_and_git_dir(path,
			git_path("modules/%s", sub->name), 0);
	} else {
		/* Is it already absorbed into the superprojects git dir? */
		char *real_sub_git_dir = real_pathdup(sub_git_dir, 1);
		char *real_common_git_dir = real_pathdup(get_git_common_dir(), 1);

		if (!starts_with(real_sub_git_dir, real_common_git_dir))
			relocate_single_git_dir_into_superproject(prefix, path);

		free(real_sub_git_dir);
		free(real_common_git_dir);
	}
	strbuf_release(&gitdir);

	if (flags & ABSORB_GITDIR_RECURSE_SUBMODULES) {
		struct child_process cp = CHILD_PROCESS_INIT;
		struct strbuf sb = STRBUF_INIT;

		if (flags & ~ABSORB_GITDIR_RECURSE_SUBMODULES)
			BUG("we don't know how to pass the flags down?");

		strbuf_addstr(&sb, get_super_prefix_or_empty());
		strbuf_addstr(&sb, path);
		strbuf_addch(&sb, '/');

		cp.dir = path;
		cp.git_cmd = 1;
		cp.no_stdin = 1;
		argv_array_pushl(&cp.args, "--super-prefix", sb.buf,
					   "submodule--helper",
					   "absorb-git-dirs", NULL);
		prepare_submodule_repo_env(&cp.env_array);
		if (run_command(&cp))
			die(_("could not recurse into submodule '%s'"), path);

		strbuf_release(&sb);
	}
}

const char *get_superproject_working_tree(void)
{
	struct child_process cp = CHILD_PROCESS_INIT;
	struct strbuf sb = STRBUF_INIT;
	const char *one_up = real_path_if_valid("../");
	const char *cwd = xgetcwd();
	const char *ret = NULL;
	const char *subpath;
	int code;
	ssize_t len;

	if (!is_inside_work_tree())
		/*
		 * FIXME:
		 * We might have a superproject, but it is harder
		 * to determine.
		 */
		return NULL;

	if (!one_up)
		return NULL;

	subpath = relative_path(cwd, one_up, &sb);

	prepare_submodule_repo_env(&cp.env_array);
	argv_array_pop(&cp.env_array);

	argv_array_pushl(&cp.args, "--literal-pathspecs", "-C", "..",
			"ls-files", "-z", "--stage", "--full-name", "--",
			subpath, NULL);
	strbuf_reset(&sb);

	cp.no_stdin = 1;
	cp.no_stderr = 1;
	cp.out = -1;
	cp.git_cmd = 1;

	if (start_command(&cp))
		die(_("could not start ls-files in .."));

	len = strbuf_read(&sb, cp.out, PATH_MAX);
	close(cp.out);

	if (starts_with(sb.buf, "160000")) {
		int super_sub_len;
		int cwd_len = strlen(cwd);
		char *super_sub, *super_wt;

		/*
		 * There is a superproject having this repo as a submodule.
		 * The format is <mode> SP <hash> SP <stage> TAB <full name> \0,
		 * We're only interested in the name after the tab.
		 */
		super_sub = strchr(sb.buf, '\t') + 1;
		super_sub_len = strlen(super_sub);

		if (super_sub_len > cwd_len ||
		    strcmp(&cwd[cwd_len - super_sub_len], super_sub))
			BUG("returned path string doesn't match cwd?");

		super_wt = xstrdup(cwd);
		super_wt[cwd_len - super_sub_len] = '\0';

		ret = real_path(super_wt);
		free(super_wt);
	}
	strbuf_release(&sb);

	code = finish_command(&cp);

	if (code == 128)
		/* '../' is not a git repository */
		return NULL;
	if (code == 0 && len == 0)
		/* There is an unrelated git repository at '../' */
		return NULL;
	if (code)
		die(_("ls-tree returned unexpected return code %d"), code);

	return ret;
}

/*
 * Put the gitdir for a submodule (given relative to the main
 * repository worktree) into `buf`, or return -1 on error.
 */
int submodule_to_gitdir(struct strbuf *buf, const char *submodule)
{
	const struct submodule *sub;
	const char *git_dir;
	int ret = 0;

	strbuf_reset(buf);
	strbuf_addstr(buf, submodule);
	strbuf_complete(buf, '/');
	strbuf_addstr(buf, ".git");

	git_dir = read_gitfile(buf->buf);
	if (git_dir) {
		strbuf_reset(buf);
		strbuf_addstr(buf, git_dir);
	}
	if (!is_git_directory(buf->buf)) {
		sub = submodule_from_path(the_repository, &null_oid, submodule);
		if (!sub) {
			ret = -1;
			goto cleanup;
		}
		strbuf_reset(buf);
		strbuf_git_path(buf, "%s/%s", "modules", sub->name);
	}

cleanup:
	return ret;
}
debug log:

solving d393e947e6 ...
found d393e947e6 in https://80x24.org/mirrors/git.git

git@vger.kernel.org list mirror (unofficial, one of many)

Archives are clonable:
	git clone --mirror https://public-inbox.org/git
	git clone --mirror http://ou63pmih66umazou.onion/git
	git clone --mirror http://czquwvybam4bgbro.onion/git
	git clone --mirror http://hjrcffqmbrq6wope.onion/git

Newsgroups are available over NNTP:
	nntp://news.public-inbox.org/inbox.comp.version-control.git
	nntp://ou63pmih66umazou.onion/inbox.comp.version-control.git
	nntp://czquwvybam4bgbro.onion/inbox.comp.version-control.git
	nntp://hjrcffqmbrq6wope.onion/inbox.comp.version-control.git
	nntp://news.gmane.org/gmane.comp.version-control.git

 note: .onion URLs require Tor: https://www.torproject.org/

AGPL code for this site: git clone https://public-inbox.org/ public-inbox