summaryrefslogtreecommitdiff
path: root/git-submodule.sh
blob: 9245abfd4263881bdd6d0f21f648b46201b52a2d (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
#!/bin/sh
#
# git-submodule.sh: add, init, update or list git submodules
#
# Copyright (c) 2007 Lars Hjemli

dashless=$(basename "$0" | sed -e 's/-/ /')
USAGE="[--quiet] add [-b <branch>] [-f|--force] [--name <name>] [--reference <repository>] [--] <repository> [<path>]
   or: $dashless [--quiet] status [--cached] [--recursive] [--] [<path>...]
   or: $dashless [--quiet] init [--] [<path>...]
   or: $dashless [--quiet] deinit [-f|--force] [--] <path>...
   or: $dashless [--quiet] update [--init] [--remote] [-N|--no-fetch] [-f|--force] [--checkout|--merge|--rebase] [--reference <repository>] [--recursive] [--] [<path>...]
   or: $dashless [--quiet] summary [--cached|--files] [--summary-limit <n>] [commit] [--] [<path>...]
   or: $dashless [--quiet] foreach [--recursive] <command>
   or: $dashless [--quiet] sync [--recursive] [--] [<path>...]"
OPTIONS_SPEC=
SUBDIRECTORY_OK=Yes
. git-sh-setup
. git-sh-i18n
. git-parse-remote
require_work_tree
wt_prefix=$(git rev-parse --show-prefix)
cd_to_toplevel

command=
branch=
force=
reference=
cached=
recursive=
init=
files=
remote=
nofetch=
update=
prefix=
custom_name=
depth=

# The function takes at most 2 arguments. The first argument is the
# URL that navigates to the submodule origin repo. When relative, this URL
# is relative to the superproject origin URL repo. The second up_path
# argument, if specified, is the relative path that navigates
# from the submodule working tree to the superproject working tree.
#
# The output of the function is the origin URL of the submodule.
#
# The output will either be an absolute URL or filesystem path (if the
# superproject origin URL is an absolute URL or filesystem path,
# respectively) or a relative file system path (if the superproject
# origin URL is a relative file system path).
#
# When the output is a relative file system path, the path is either
# relative to the submodule working tree, if up_path is specified, or to
# the superproject working tree otherwise.
resolve_relative_url ()
{
	remote=$(get_default_remote)
	remoteurl=$(git config "remote.$remote.url") ||
		remoteurl=$(pwd) # the repository is its own authoritative upstream
	url="$1"
	remoteurl=${remoteurl%/}
	sep=/
	up_path="$2"

	case "$remoteurl" in
	*:*|/*)
		is_relative=
		;;
	./*|../*)
		is_relative=t
		;;
	*)
		is_relative=t
		remoteurl="./$remoteurl"
		;;
	esac

	while test -n "$url"
	do
		case "$url" in
		../*)
			url="${url#../}"
			case "$remoteurl" in
			*/*)
				remoteurl="${remoteurl%/*}"
				;;
			*:*)
				remoteurl="${remoteurl%:*}"
				sep=:
				;;
			*)
				if test -z "$is_relative" || test "." = "$remoteurl"
				then
					die "$(eval_gettext "cannot strip one component off url '\$remoteurl'")"
				else
					remoteurl=.
				fi
				;;
			esac
			;;
		./*)
			url="${url#./}"
			;;
		*)
			break;;
		esac
	done
	remoteurl="$remoteurl$sep${url%/}"
	echo "${is_relative:+${up_path}}${remoteurl#./}"
}

# Resolve a path to be relative to another path.  This is intended for
# converting submodule paths when git-submodule is run in a subdirectory
# and only handles paths where the directory separator is '/'.
#
# The output is the first argument as a path relative to the second argument,
# which defaults to $wt_prefix if it is omitted.
relative_path ()
{
	local target curdir result
	target=$1
	curdir=${2-$wt_prefix}
	curdir=${curdir%/}
	result=

	while test -n "$curdir"
	do
		case "$target" in
		"$curdir/"*)
			target=${target#"$curdir"/}
			break
			;;
		esac

		result="${result}../"
		if test "$curdir" = "${curdir%/*}"
		then
			curdir=
		else
			curdir="${curdir%/*}"
		fi
	done

	echo "$result$target"
}

#
# Get submodule info for registered submodules
# $@ = path to limit submodule list
#
module_list()
{
	eval "set $(git rev-parse --sq --prefix "$wt_prefix" -- "$@")"
	(
		git ls-files -z --error-unmatch --stage -- "$@" ||
		echo "unmatched pathspec exists"
	) |
	@@PERL@@ -e '
	my %unmerged = ();
	my ($null_sha1) = ("0" x 40);
	my @out = ();
	my $unmatched = 0;
	$/ = "\0";
	while (<STDIN>) {
		if (/^unmatched pathspec/) {
			$unmatched = 1;
			next;
		}
		chomp;
		my ($mode, $sha1, $stage, $path) =
			/^([0-7]+) ([0-9a-f]{40}) ([0-3])\t(.*)$/;
		next unless $mode eq "160000";
		if ($stage ne "0") {
			if (!$unmerged{$path}++) {
				push @out, "$mode $null_sha1 U\t$path\n";
			}
			next;
		}
		push @out, "$_\n";
	}
	if ($unmatched) {
		print "#unmatched\n";
	} else {
		print for (@out);
	}
	'
}

die_if_unmatched ()
{
	if test "$1" = "#unmatched"
	then
		exit 1
	fi
}

#
# Print a submodule configuration setting
#
# $1 = submodule name
# $2 = option name
# $3 = default value
#
# Checks in the usual git-config places first (for overrides),
# otherwise it falls back on .gitmodules.  This allows you to
# distribute project-wide defaults in .gitmodules, while still
# customizing individual repositories if necessary.  If the option is
# not in .gitmodules either, print a default value.
#
get_submodule_config () {
	name="$1"
	option="$2"
	default="$3"
	value=$(git config submodule."$name"."$option")
	if test -z "$value"
	then
		value=$(git config -f .gitmodules submodule."$name"."$option")
	fi
	printf '%s' "${value:-$default}"
}


#
# Map submodule path to submodule name
#
# $1 = path
#
module_name()
{
	# Do we have "submodule.<something>.path = $1" defined in .gitmodules file?
	sm_path="$1"
	re=$(printf '%s\n' "$1" | sed -e 's/[].[^$\\*]/\\&/g')
	name=$( git config -f .gitmodules --get-regexp '^submodule\..*\.path$' |
		sed -n -e 's|^submodule\.\(.*\)\.path '"$re"'$|\1|p' )
	test -z "$name" &&
	die "$(eval_gettext "No submodule mapping found in .gitmodules for path '\$sm_path'")"
	printf '%s\n' "$name"
}

#
# Clone a submodule
#
# $1 = submodule path
# $2 = submodule name
# $3 = URL to clone
# $4 = reference repository to reuse (empty for independent)
# $5 = depth argument for shallow clones (empty for deep)
#
# Prior to calling, cmd_update checks that a possibly existing
# path is not a git repository.
# Likewise, cmd_add checks that path does not exist at all,
# since it is the location of a new submodule.
#
module_clone()
{
	sm_path=$1
	name=$2
	url=$3
	reference="$4"
	depth="$5"
	quiet=
	if test -n "$GIT_QUIET"
	then
		quiet=-q
	fi

	gitdir=
	gitdir_base=
	base_name=$(dirname "$name")

	gitdir=$(git rev-parse --git-dir)
	gitdir_base="$gitdir/modules/$base_name"
	gitdir="$gitdir/modules/$name"

	if test -d "$gitdir"
	then
		mkdir -p "$sm_path"
		rm -f "$gitdir/index"
	else
		mkdir -p "$gitdir_base"
		(
			clear_local_git_env
			git clone $quiet ${depth:+"$depth"} -n ${reference:+"$reference"} \
				--separate-git-dir "$gitdir" "$url" "$sm_path"
		) ||
		die "$(eval_gettext "Clone of '\$url' into submodule path '\$sm_path' failed")"
	fi

	# We already are at the root of the work tree but cd_to_toplevel will
	# resolve any symlinks that might be present in $PWD
	a=$(cd_to_toplevel && cd "$gitdir" && pwd)/
	b=$(cd_to_toplevel && cd "$sm_path" && pwd)/
	# Remove all common leading directories after a sanity check
	if test "${a#$b}" != "$a" || test "${b#$a}" != "$b"; then
		die "$(eval_gettext "Gitdir '\$a' is part of the submodule path '\$b' or vice versa")"
	fi
	while test "${a%%/*}" = "${b%%/*}"
	do
		a=${a#*/}
		b=${b#*/}
	done
	# Now chop off the trailing '/'s that were added in the beginning
	a=${a%/}
	b=${b%/}

	# Turn each leading "*/" component into "../"
	rel=$(printf '%s\n' "$b" | sed -e 's|[^/][^/]*|..|g')
	printf '%s\n' "gitdir: $rel/$a" >"$sm_path/.git"

	rel=$(printf '%s\n' "$a" | sed -e 's|[^/][^/]*|..|g')
	(clear_local_git_env; cd "$sm_path" && GIT_WORK_TREE=. git config core.worktree "$rel/$b")
}

isnumber()
{
	n=$(($1 + 0)) 2>/dev/null && test "$n" = "$1"
}

#
# Add a new submodule to the working tree, .gitmodules and the index
#
# $@ = repo path
#
# optional branch is stored in global branch variable
#
cmd_add()
{
	# parse $args after "submodule ... add".
	reference_path=
	while test $# -ne 0
	do
		case "$1" in
		-b | --branch)
			case "$2" in '') usage ;; esac
			branch=$2
			shift
			;;
		-f | --force)
			force=$1
			;;
		-q|--quiet)
			GIT_QUIET=1
			;;
		--reference)
			case "$2" in '') usage ;; esac
			reference_path=$2
			shift
			;;
		--reference=*)
			reference_path="${1#--reference=}"
			;;
		--name)
			case "$2" in '') usage ;; esac
			custom_name=$2
			shift
			;;
		--depth)
			case "$2" in '') usage ;; esac
			depth="--depth=$2"
			shift
			;;
		--depth=*)
			depth=$1
			;;
		--)
			shift
			break
			;;
		-*)
			usage
			;;
		*)
			break
			;;
		esac
		shift
	done

	if test -n "$reference_path"
	then
		is_absolute_path "$reference_path" ||
		reference_path="$wt_prefix$reference_path"

		reference="--reference=$reference_path"
	fi

	repo=$1
	sm_path=$2

	if test -z "$sm_path"; then
		sm_path=$(printf '%s\n' "$repo" |
			sed -e 's|/$||' -e 's|:*/*\.git$||' -e 's|.*[/:]||g')
	fi

	if test -z "$repo" || test -z "$sm_path"; then
		usage
	fi

	is_absolute_path "$sm_path" || sm_path="$wt_prefix$sm_path"

	# assure repo is absolute or relative to parent
	case "$repo" in
	./*|../*)
		test -z "$wt_prefix" ||
		die "$(gettext "Relative path can only be used from the toplevel of the working tree")"

		# dereference source url relative to parent's url
		realrepo=$(resolve_relative_url "$repo") || exit
		;;
	*:*|/*)
		# absolute url
		realrepo=$repo
		;;
	*)
		die "$(eval_gettext "repo URL: '\$repo' must be absolute or begin with ./|../")"
	;;
	esac

	# normalize path:
	# multiple //; leading ./; /./; /../; trailing /
	sm_path=$(printf '%s/\n' "$sm_path" |
		sed -e '
			s|//*|/|g
			s|^\(\./\)*||
			s|/\./|/|g
			:start
			s|\([^/]*\)/\.\./||
			tstart
			s|/*$||
		')
	git ls-files --error-unmatch "$sm_path" > /dev/null 2>&1 &&
	die "$(eval_gettext "'\$sm_path' already exists in the index")"

	if test -z "$force" && ! git add --dry-run --ignore-missing "$sm_path" > /dev/null 2>&1
	then
		eval_gettextln "The following path is ignored by one of your .gitignore files:
\$sm_path
Use -f if you really want to add it." >&2
		exit 1
	fi

	if test -n "$custom_name"
	then
		sm_name="$custom_name"
	else
		sm_name="$sm_path"
	fi

	# perhaps the path exists and is already a git repo, else clone it
	if test -e "$sm_path"
	then
		if test -d "$sm_path"/.git || test -f "$sm_path"/.git
		then
			eval_gettextln "Adding existing repo at '\$sm_path' to the index"
		else
			die "$(eval_gettext "'\$sm_path' already exists and is not a valid git repo")"
		fi

	else
		if test -d ".git/modules/$sm_name"
		then
			if test -z "$force"
			then
				echo >&2 "$(eval_gettext "A git directory for '\$sm_name' is found locally with remote(s):")"
				GIT_DIR=".git/modules/$sm_name" GIT_WORK_TREE=. git remote -v | grep '(fetch)' | sed -e s,^,"  ", -e s,' (fetch)',, >&2
				echo >&2 "$(eval_gettext "If you want to reuse this local git directory instead of cloning again from")"
				echo >&2 "  $realrepo"
				echo >&2 "$(eval_gettext "use the '--force' option. If the local git directory is not the correct repo")"
				die "$(eval_gettext "or you are unsure what this means choose another name with the '--name' option.")"
			else
				echo "$(eval_gettext "Reactivating local git directory for submodule '\$sm_name'.")"
			fi
		fi
		module_clone "$sm_path" "$sm_name" "$realrepo" "$reference" "$depth" || exit
		(
			clear_local_git_env
			cd "$sm_path" &&
			# ash fails to wordsplit ${branch:+-b "$branch"...}
			case "$branch" in
			'') git checkout -f -q ;;
			?*) git checkout -f -q -B "$branch" "origin/$branch" ;;
			esac
		) || die "$(eval_gettext "Unable to checkout submodule '\$sm_path'")"
	fi
	git config submodule."$sm_name".url "$realrepo"

	git add $force "$sm_path" ||
	die "$(eval_gettext "Failed to add submodule '\$sm_path'")"

	git config -f .gitmodules submodule."$sm_name".path "$sm_path" &&
	git config -f .gitmodules submodule."$sm_name".url "$repo" &&
	if test -n "$branch"
	then
		git config -f .gitmodules submodule."$sm_name".branch "$branch"
	fi &&
	git add --force .gitmodules ||
	die "$(eval_gettext "Failed to register submodule '\$sm_path'")"
}

#
# Execute an arbitrary command sequence in each checked out
# submodule
#
# $@ = command to execute
#
cmd_foreach()
{
	# parse $args after "submodule ... foreach".
	while test $# -ne 0
	do
		case "$1" in
		-q|--quiet)
			GIT_QUIET=1
			;;
		--recursive)
			recursive=1
			;;
		-*)
			usage
			;;
		*)
			break
			;;
		esac
		shift
	done

	toplevel=$(pwd)

	# dup stdin so that it can be restored when running the external
	# command in the subshell (and a recursive call to this function)
	exec 3<&0

	module_list |
	while read mode sha1 stage sm_path
	do
		die_if_unmatched "$mode"
		if test -e "$sm_path"/.git
		then
			displaypath=$(relative_path "$sm_path")
			say "$(eval_gettext "Entering '\$prefix\$displaypath'")"
			name=$(module_name "$sm_path")
			(
				prefix="$prefix$sm_path/"
				clear_local_git_env
				cd "$sm_path" &&
				sm_path=$(relative_path "$sm_path") &&
				# we make $path available to scripts ...
				path=$sm_path &&
				if test $# -eq 1
				then
					eval "$1"
				else
					"$@"
				fi &&
				if test -n "$recursive"
				then
					cmd_foreach "--recursive" "$@"
				fi
			) <&3 3<&- ||
			die "$(eval_gettext "Stopping at '\$prefix\$displaypath'; script returned non-zero status.")"
		fi
	done
}

#
# Register submodules in .git/config
#
# $@ = requested paths (default to all)
#
cmd_init()
{
	# parse $args after "submodule ... init".
	while test $# -ne 0
	do
		case "$1" in
		-q|--quiet)
			GIT_QUIET=1
			;;
		--)
			shift
			break
			;;
		-*)
			usage
			;;
		*)
			break
			;;
		esac
		shift
	done

	module_list "$@" |
	while read mode sha1 stage sm_path
	do
		die_if_unmatched "$mode"
		name=$(module_name "$sm_path") || exit

		displaypath=$(relative_path "$sm_path")

		# Copy url setting when it is not set yet
		if test -z "$(git config "submodule.$name.url")"
		then
			url=$(git config -f .gitmodules submodule."$name".url)
			test -z "$url" &&
			die "$(eval_gettext "No url found for submodule path '\$displaypath' in .gitmodules")"

			# Possibly a url relative to parent
			case "$url" in
			./*|../*)
				url=$(resolve_relative_url "$url") || exit
				;;
			esac
			git config submodule."$name".url "$url" ||
			die "$(eval_gettext "Failed to register url for submodule path '\$displaypath'")"

			say "$(eval_gettext "Submodule '\$name' (\$url) registered for path '\$displaypath'")"
		fi

		# Copy "update" setting when it is not set yet
		if upd="$(git config -f .gitmodules submodule."$name".update)" &&
		   test -n "$upd" &&
		   test -z "$(git config submodule."$name".update)"
		then
			case "$upd" in
			checkout | rebase | merge | none)
				;; # known modes of updating
			*)
				echo >&2 "warning: unknown update mode '$upd' suggested for submodule '$name'"
				upd=none
				;;
			esac
			git config submodule."$name".update "$upd" ||
			die "$(eval_gettext "Failed to register update mode for submodule path '\$displaypath'")"
		fi
	done
}

#
# Unregister submodules from .git/config and remove their work tree
#
# $@ = requested paths (use '.' to deinit all submodules)
#
cmd_deinit()
{
	# parse $args after "submodule ... deinit".
	while test $# -ne 0
	do
		case "$1" in
		-f|--force)
			force=$1
			;;
		-q|--quiet)
			GIT_QUIET=1
			;;
		--)
			shift
			break
			;;
		-*)
			usage
			;;
		*)
			break
			;;
		esac
		shift
	done

	if test $# = 0
	then
		die "$(eval_gettext "Use '.' if you really want to deinitialize all submodules")"
	fi

	module_list "$@" |
	while read mode sha1 stage sm_path
	do
		die_if_unmatched "$mode"
		name=$(module_name "$sm_path") || exit

		displaypath=$(relative_path "$sm_path")

		# Remove the submodule work tree (unless the user already did it)
		if test -d "$sm_path"
		then
			# Protect submodules containing a .git directory
			if test -d "$sm_path/.git"
			then
				echo >&2 "$(eval_gettext "Submodule work tree '\$displaypath' contains a .git directory")"
				die "$(eval_gettext "(use 'rm -rf' if you really want to remove it including all of its history)")"
			fi

			if test -z "$force"
			then
				git rm -qn "$sm_path" ||
				die "$(eval_gettext "Submodule work tree '\$displaypath' contains local modifications; use '-f' to discard them")"
			fi
			rm -rf "$sm_path" &&
			say "$(eval_gettext "Cleared directory '\$displaypath'")" ||
			say "$(eval_gettext "Could not remove submodule work tree '\$displaypath'")"
		fi

		mkdir "$sm_path" || say "$(eval_gettext "Could not create empty submodule directory '\$displaypath'")"

		# Remove the .git/config entries (unless the user already did it)
		if test -n "$(git config --get-regexp submodule."$name\.")"
		then
			# Remove the whole section so we have a clean state when
			# the user later decides to init this submodule again
			url=$(git config submodule."$name".url)
			git config --remove-section submodule."$name" 2>/dev/null &&
			say "$(eval_gettext "Submodule '\$name' (\$url) unregistered for path '\$displaypath'")"
		fi
	done
}

#
# Update each submodule path to correct revision, using clone and checkout as needed
#
# $@ = requested paths (default to all)
#
cmd_update()
{
	# parse $args after "submodule ... update".
	while test $# -ne 0
	do
		case "$1" in
		-q|--quiet)
			GIT_QUIET=1
			;;
		-i|--init)
			init=1
			;;
		--remote)
			remote=1
			;;
		-N|--no-fetch)
			nofetch=1
			;;
		-f|--force)
			force=$1
			;;
		-r|--rebase)
			update="rebase"
			;;
		--reference)
			case "$2" in '') usage ;; esac
			reference="--reference=$2"
			shift
			;;
		--reference=*)
			reference="$1"
			;;
		-m|--merge)
			update="merge"
			;;
		--recursive)
			recursive=1
			;;
		--checkout)
			update="checkout"
			;;
		--depth)
			case "$2" in '') usage ;; esac
			depth="--depth=$2"
			shift
			;;
		--depth=*)
			depth=$1
			;;
		--)
			shift
			break
			;;
		-*)
			usage
			;;
		*)
			break
			;;
		esac
		shift
	done

	if test -n "$init"
	then
		cmd_init "--" "$@" || return
	fi

	cloned_modules=
	module_list "$@" | {
	err=
	while read mode sha1 stage sm_path
	do
		die_if_unmatched "$mode"
		if test "$stage" = U
		then
			echo >&2 "Skipping unmerged submodule $prefix$sm_path"
			continue
		fi
		name=$(module_name "$sm_path") || exit
		url=$(git config submodule."$name".url)
		branch=$(get_submodule_config "$name" branch master)
		if ! test -z "$update"
		then
			update_module=$update
		else
			update_module=$(git config submodule."$name".update)
			if test -z "$update_module"
			then
				update_module="checkout"
			fi
		fi

		displaypath=$(relative_path "$prefix$sm_path")

		if test "$update_module" = "none"
		then
			echo "Skipping submodule '$displaypath'"
			continue
		fi

		if test -z "$url"
		then
			# Only mention uninitialized submodules when its
			# path have been specified
			test "$#" != "0" &&
			say "$(eval_gettext "Submodule path '\$displaypath' not initialized
Maybe you want to use 'update --init'?")"
			continue
		fi

		if ! test -d "$sm_path"/.git && ! test -f "$sm_path"/.git
		then
			module_clone "$sm_path" "$name" "$url" "$reference" "$depth" || exit
			cloned_modules="$cloned_modules;$name"
			subsha1=
		else
			subsha1=$(clear_local_git_env; cd "$sm_path" &&
				git rev-parse --verify HEAD) ||
			die "$(eval_gettext "Unable to find current revision in submodule path '\$displaypath'")"
		fi

		if test -n "$remote"
		then
			if test -z "$nofetch"
			then
				# Fetch remote before determining tracking $sha1
				(clear_local_git_env; cd "$sm_path" && git-fetch) ||
				die "$(eval_gettext "Unable to fetch in submodule path '\$sm_path'")"
			fi
			remote_name=$(clear_local_git_env; cd "$sm_path" && get_default_remote)
			sha1=$(clear_local_git_env; cd "$sm_path" &&
				git rev-parse --verify "${remote_name}/${branch}") ||
			die "$(eval_gettext "Unable to find current ${remote_name}/${branch} revision in submodule path '\$sm_path'")"
		fi

		if test "$subsha1" != "$sha1" || test -n "$force"
		then
			subforce=$force
			# If we don't already have a -f flag and the submodule has never been checked out
			if test -z "$subsha1" && test -z "$force"
			then
				subforce="-f"
			fi

			if test -z "$nofetch"
			then
				# Run fetch only if $sha1 isn't present or it
				# is not reachable from a ref.
				(clear_local_git_env; cd "$sm_path" &&
					( (rev=$(git rev-list -n 1 $sha1 --not --all 2>/dev/null) &&
					 test -z "$rev") || git-fetch)) ||
				die "$(eval_gettext "Unable to fetch in submodule path '\$displaypath'")"
			fi

			# Is this something we just cloned?
			case ";$cloned_modules;" in
			*";$name;"*)
				# then there is no local change to integrate
				update_module=checkout ;;
			esac

			must_die_on_failure=
			case "$update_module" in
			checkout)
				command="git checkout $subforce -q"
				die_msg="$(eval_gettext "Unable to checkout '\$sha1' in submodule path '\$displaypath'")"
				say_msg="$(eval_gettext "Submodule path '\$displaypath': checked out '\$sha1'")"
				;;
			rebase)
				command="git rebase"
				die_msg="$(eval_gettext "Unable to rebase '\$sha1' in submodule path '\$displaypath'")"
				say_msg="$(eval_gettext "Submodule path '\$displaypath': rebased into '\$sha1'")"
				must_die_on_failure=yes
				;;
			merge)
				command="git merge"
				die_msg="$(eval_gettext "Unable to merge '\$sha1' in submodule path '\$displaypath'")"
				say_msg="$(eval_gettext "Submodule path '\$displaypath': merged in '\$sha1'")"
				must_die_on_failure=yes
				;;
			!*)
				command="${update_module#!}"
				die_msg="$(eval_gettext "Execution of '\$command \$sha1' failed in submodule  path '\$prefix\$sm_path'")"
				say_msg="$(eval_gettext "Submodule path '\$prefix\$sm_path': '\$command \$sha1'")"
				must_die_on_failure=yes
				;;
			*)
				die "$(eval_gettext "Invalid update mode '$update_module' for submodule '$name'")"
			esac

			if (clear_local_git_env; cd "$sm_path" && $command "$sha1")
			then
				say "$say_msg"
			elif test -n "$must_die_on_failure"
			then
				die_with_status 2 "$die_msg"
			else
				err="${err};$die_msg"
				continue
			fi
		fi

		if test -n "$recursive"
		then
			(
				prefix="$prefix$sm_path/"
				clear_local_git_env
				cd "$sm_path" &&
				eval cmd_update
			)
			res=$?
			if test $res -gt 0
			then
				die_msg="$(eval_gettext "Failed to recurse into submodule path '\$displaypath'")"
				if test $res -eq 1
				then
					err="${err};$die_msg"
					continue
				else
					die_with_status $res "$die_msg"
				fi
			fi
		fi
	done

	if test -n "$err"
	then
		OIFS=$IFS
		IFS=';'
		for e in $err
		do
			if test -n "$e"
			then
				echo >&2 "$e"
			fi
		done
		IFS=$OIFS
		exit 1
	fi
	}
}

set_name_rev () {
	revname=$( (
		clear_local_git_env
		cd "$1" && {
			git describe "$2" 2>/dev/null ||
			git describe --tags "$2" 2>/dev/null ||
			git describe --contains "$2" 2>/dev/null ||
			git describe --all --always "$2"
		}
	) )
	test -z "$revname" || revname=" ($revname)"
}
#
# Show commit summary for submodules in index or working tree
#
# If '--cached' is given, show summary between index and given commit,
# or between working tree and given commit
#
# $@ = [commit (default 'HEAD'),] requested paths (default all)
#
cmd_summary() {
	summary_limit=-1
	for_status=
	diff_cmd=diff-index

	# parse $args after "submodule ... summary".
	while test $# -ne 0
	do
		case "$1" in
		--cached)
			cached="$1"
			;;
		--files)
			files="$1"
			;;
		--for-status)
			for_status="$1"
			;;
		-n|--summary-limit)
			summary_limit="$2"
			isnumber "$summary_limit" || usage
			shift
			;;
		--summary-limit=*)
			summary_limit="${1#--summary-limit=}"
			isnumber "$summary_limit" || usage
			;;
		--)
			shift
			break
			;;
		-*)
			usage
			;;
		*)
			break
			;;
		esac
		shift
	done

	test $summary_limit = 0 && return

	if rev=$(git rev-parse -q --verify --default HEAD ${1+"$1"})
	then
		head=$rev
		test $# = 0 || shift
	elif test -z "$1" || test "$1" = "HEAD"
	then
		# before the first commit: compare with an empty tree
		head=$(git hash-object -w -t tree --stdin </dev/null)
		test -z "$1" || shift
	else
		head="HEAD"
	fi

	if [ -n "$files" ]
	then
		test -n "$cached" &&
		die "$(gettext "The --cached option cannot be used with the --files option")"
		diff_cmd=diff-files
		head=
	fi

	cd_to_toplevel
	eval "set $(git rev-parse --sq --prefix "$wt_prefix" -- "$@")"
	# Get modified modules cared by user
	modules=$(git $diff_cmd $cached --ignore-submodules=dirty --raw $head -- "$@" |
		sane_egrep '^:([0-7]* )?160000' |
		while read mod_src mod_dst sha1_src sha1_dst status sm_path
		do
			# Always show modules deleted or type-changed (blob<->module)
			if test "$status" = D || test "$status" = T
			then
				printf '%s\n' "$sm_path"
				continue
			fi
			# Respect the ignore setting for --for-status.
			if test -n "$for_status"
			then
				name=$(module_name "$sm_path")
				ignore_config=$(get_submodule_config "$name" ignore none)
				test $status != A && test $ignore_config = all && continue
			fi
			# Also show added or modified modules which are checked out
			GIT_DIR="$sm_path/.git" git-rev-parse --git-dir >/dev/null 2>&1 &&
			printf '%s\n' "$sm_path"
		done
	)

	test -z "$modules" && return

	git $diff_cmd $cached --ignore-submodules=dirty --raw $head -- $modules |
	sane_egrep '^:([0-7]* )?160000' |
	cut -c2- |
	while read mod_src mod_dst sha1_src sha1_dst status name
	do
		if test -z "$cached" &&
			test $sha1_dst = 0000000000000000000000000000000000000000
		then
			case "$mod_dst" in
			160000)
				sha1_dst=$(GIT_DIR="$name/.git" git rev-parse HEAD)
				;;
			100644 | 100755 | 120000)
				sha1_dst=$(git hash-object $name)
				;;
			000000)
				;; # removed
			*)
				# unexpected type
				eval_gettextln "unexpected mode \$mod_dst" >&2
				continue ;;
			esac
		fi
		missing_src=
		missing_dst=

		test $mod_src = 160000 &&
		! GIT_DIR="$name/.git" git-rev-parse -q --verify $sha1_src^0 >/dev/null &&
		missing_src=t

		test $mod_dst = 160000 &&
		! GIT_DIR="$name/.git" git-rev-parse -q --verify $sha1_dst^0 >/dev/null &&
		missing_dst=t

		display_name=$(relative_path "$name")

		total_commits=
		case "$missing_src,$missing_dst" in
		t,)
			errmsg="$(eval_gettext "  Warn: \$display_name doesn't contain commit \$sha1_src")"
			;;
		,t)
			errmsg="$(eval_gettext "  Warn: \$display_name doesn't contain commit \$sha1_dst")"
			;;
		t,t)
			errmsg="$(eval_gettext "  Warn: \$display_name doesn't contain commits \$sha1_src and \$sha1_dst")"
			;;
		*)
			errmsg=
			total_commits=$(
			if test $mod_src = 160000 && test $mod_dst = 160000
			then
				range="$sha1_src...$sha1_dst"
			elif test $mod_src = 160000
			then
				range=$sha1_src
			else
				range=$sha1_dst
			fi
			GIT_DIR="$name/.git" \
			git rev-list --first-parent $range -- | wc -l
			)
			total_commits=" ($(($total_commits + 0)))"
			;;
		esac

		sha1_abbr_src=$(echo $sha1_src | cut -c1-7)
		sha1_abbr_dst=$(echo $sha1_dst | cut -c1-7)
		if test $status = T
		then
			blob="$(gettext "blob")"
			submodule="$(gettext "submodule")"
			if test $mod_dst = 160000
			then
				echo "* $display_name $sha1_abbr_src($blob)->$sha1_abbr_dst($submodule)$total_commits:"
			else
				echo "* $display_name $sha1_abbr_src($submodule)->$sha1_abbr_dst($blob)$total_commits:"
			fi
		else
			echo "* $display_name $sha1_abbr_src...$sha1_abbr_dst$total_commits:"
		fi
		if test -n "$errmsg"
		then
			# Don't give error msg for modification whose dst is not submodule
			# i.e. deleted or changed to blob
			test $mod_dst = 160000 && echo "$errmsg"
		else
			if test $mod_src = 160000 && test $mod_dst = 160000
			then
				limit=
				test $summary_limit -gt 0 && limit="-$summary_limit"
				GIT_DIR="$name/.git" \
				git log $limit --pretty='format:  %m %s' \
				--first-parent $sha1_src...$sha1_dst
			elif test $mod_dst = 160000
			then
				GIT_DIR="$name/.git" \
				git log --pretty='format:  > %s' -1 $sha1_dst
			else
				GIT_DIR="$name/.git" \
				git log --pretty='format:  < %s' -1 $sha1_src
			fi
			echo
		fi
		echo
	done
}
#
# List all submodules, prefixed with:
#  - submodule not initialized
#  + different revision checked out
#
# If --cached was specified the revision in the index will be printed
# instead of the currently checked out revision.
#
# $@ = requested paths (default to all)
#
cmd_status()
{
	# parse $args after "submodule ... status".
	while test $# -ne 0
	do
		case "$1" in
		-q|--quiet)
			GIT_QUIET=1
			;;
		--cached)
			cached=1
			;;
		--recursive)
			recursive=1
			;;
		--)
			shift
			break
			;;
		-*)
			usage
			;;
		*)
			break
			;;
		esac
		shift
	done

	module_list "$@" |
	while read mode sha1 stage sm_path
	do
		die_if_unmatched "$mode"
		name=$(module_name "$sm_path") || exit
		url=$(git config submodule."$name".url)
		displaypath=$(relative_path "$prefix$sm_path")
		if test "$stage" = U
		then
			say "U$sha1 $displaypath"
			continue
		fi
		if test -z "$url" ||
		{
			! test -d "$sm_path"/.git &&
			! test -f "$sm_path"/.git
		}
		then
			say "-$sha1 $displaypath"
			continue;
		fi
		if git diff-files --ignore-submodules=dirty --quiet -- "$sm_path"
		then
			set_name_rev "$sm_path" "$sha1"
			say " $sha1 $displaypath$revname"
		else
			if test -z "$cached"
			then
				sha1=$(clear_local_git_env; cd "$sm_path" && git rev-parse --verify HEAD)
			fi
			set_name_rev "$sm_path" "$sha1"
			say "+$sha1 $displaypath$revname"
		fi

		if test -n "$recursive"
		then
			(
				prefix="$displaypath/"
				clear_local_git_env
				cd "$sm_path" &&
				eval cmd_status
			) ||
			die "$(eval_gettext "Failed to recurse into submodule path '\$sm_path'")"
		fi
	done
}
#
# Sync remote urls for submodules
# This makes the value for remote.$remote.url match the value
# specified in .gitmodules.
#
cmd_sync()
{
	while test $# -ne 0
	do
		case "$1" in
		-q|--quiet)
			GIT_QUIET=1
			shift
			;;
		--recursive)
			recursive=1
			shift
			;;
		--)
			shift
			break
			;;
		-*)
			usage
			;;
		*)
			break
			;;
		esac
	done
	cd_to_toplevel
	module_list "$@" |
	while read mode sha1 stage sm_path
	do
		die_if_unmatched "$mode"
		name=$(module_name "$sm_path")
		url=$(git config -f .gitmodules --get submodule."$name".url)

		# Possibly a url relative to parent
		case "$url" in
		./*|../*)
			# rewrite foo/bar as ../.. to find path from
			# submodule work tree to superproject work tree
			up_path="$(printf '%s\n' "$sm_path" | sed "s/[^/][^/]*/../g")" &&
			# guarantee a trailing /
			up_path=${up_path%/}/ &&
			# path from submodule work tree to submodule origin repo
			sub_origin_url=$(resolve_relative_url "$url" "$up_path") &&
			# path from superproject work tree to submodule origin repo
			super_config_url=$(resolve_relative_url "$url") || exit
			;;
		*)
			sub_origin_url="$url"
			super_config_url="$url"
			;;
		esac

		if git config "submodule.$name.url" >/dev/null 2>/dev/null
		then
			displaypath=$(relative_path "$prefix$sm_path")
			say "$(eval_gettext "Synchronizing submodule url for '\$displaypath'")"
			git config submodule."$name".url "$super_config_url"

			if test -e "$sm_path"/.git
			then
			(
				clear_local_git_env
				cd "$sm_path"
				remote=$(get_default_remote)
				git config remote."$remote".url "$sub_origin_url"

				if test -n "$recursive"
				then
					prefix="$prefix$sm_path/"
					eval cmd_sync
				fi
			)
			fi
		fi
	done
}

# This loop parses the command line arguments to find the
# subcommand name to dispatch.  Parsing of the subcommand specific
# options are primarily done by the subcommand implementations.
# Subcommand specific options such as --branch and --cached are
# parsed here as well, for backward compatibility.

while test $# != 0 && test -z "$command"
do
	case "$1" in
	add | foreach | init | deinit | update | status | summary | sync)
		command=$1
		;;
	-q|--quiet)
		GIT_QUIET=1
		;;
	-b|--branch)
		case "$2" in
		'')
			usage
			;;
		esac
		branch="$2"; shift
		;;
	--cached)
		cached="$1"
		;;
	--)
		break
		;;
	-*)
		usage
		;;
	*)
		break
		;;
	esac
	shift
done

# No command word defaults to "status"
if test -z "$command"
then
    if test $# = 0
    then
	command=status
    else
	usage
    fi
fi

# "-b branch" is accepted only by "add"
if test -n "$branch" && test "$command" != add
then
	usage
fi

# "--cached" is accepted only by "status" and "summary"
if test -n "$cached" && test "$command" != status && test "$command" != summary
then
	usage
fi

"cmd_$command" "$@"