submodule: fix handling of superproject origin URLs like foo, ./foo and ./foo/bar

Currently git submodule init and git submodule sync fail with an error
if the superproject origin URL is of the form foo but succeed if the
superproject origin URL is of the form ./foo or ./foo/bar or foo/bar.

This change makes handling of the foo case behave like the handling
of the ./foo case and also ensures that superfluous leading and
embedded ./'s are removed from the resulting derived URLs.

Signed-off-by: Jon Seymour <jon.seymour@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

git-submodule.sh

@@ -60,8 +60,12 @@ resolve_relative_url ()
 	*:*|/*)
 		is_relative=
 		;;
+	./*|../*)
+		is_relative=t
+		;;
 	*)
 		is_relative=t
+		remoteurl="./$remoteurl"
 		;;
 	esac
 
@@ -79,7 +83,12 @@ resolve_relative_url ()
 				sep=:
 				;;
 			*)
-				die "$(eval_gettext "cannot strip one component off url '\$remoteurl'")"
+				if test -z "$is_relative" || test "." = "$remoteurl"
+				then
+					die "$(eval_gettext "cannot strip one component off url '\$remoteurl'")"
+				else
+					remoteurl=.
+				fi
 				;;
 			esac
 			;;
@@ -90,7 +99,8 @@ resolve_relative_url ()
 			break;;
 		esac
 	done
-	echo "${is_relative:+${up_path}}$remoteurl$sep${url%/}"
+	remoteurl="$remoteurl$sep${url%/}"
+	echo "${is_relative:+${up_path}}${remoteurl#./}"
 }
 
 #

t/t7400-submodule-basic.sh

@@ -564,7 +564,7 @@ test_expect_success '../subrepo works with scp-style URL - user@host:path/to/rep
 	)
 '
 
-test_expect_failure '../subrepo works with relative local path - foo' '
+test_expect_success '../subrepo works with relative local path - foo' '
 	(
 		cd reltest &&
 		cp pristine-.git-config .git/config &&
@@ -587,7 +587,7 @@ test_expect_success '../subrepo works with relative local path - foo/bar' '
 	)
 '
 
-test_expect_failure '../subrepo works with relative local path - ./foo' '
+test_expect_success '../subrepo works with relative local path - ./foo' '
 	(
 		cd reltest &&
 		cp pristine-.git-config .git/config &&
@@ -598,7 +598,7 @@ test_expect_failure '../subrepo works with relative local path - ./foo' '
 	)
 '
 
-test_expect_failure '../subrepo works with relative local path - ./foo/bar' '
+test_expect_success '../subrepo works with relative local path - ./foo/bar' '
 	(
 		cd reltest &&
 		cp pristine-.git-config .git/config &&

t/t7403-submodule-sync.sh

@@ -88,7 +88,7 @@ test_expect_success '"git submodule sync" should not vivify uninteresting submod
 	)
 '
 
-test_expect_failure '"git submodule sync" handles origin URL of the form foo' '
+test_expect_success '"git submodule sync" handles origin URL of the form foo' '
 	(cd relative-clone &&
 	 git remote set-url origin foo &&
 	 git submodule sync &&
@@ -110,7 +110,7 @@ test_expect_success '"git submodule sync" handles origin URL of the form foo/bar
 	)
 '
 
-test_expect_failure '"git submodule sync" handles origin URL of the form ./foo' '
+test_expect_success '"git submodule sync" handles origin URL of the form ./foo' '
 	(cd relative-clone &&
 	 git remote set-url origin ./foo &&
 	 git submodule sync &&
@@ -121,7 +121,7 @@ test_expect_failure '"git submodule sync" handles origin URL of the form ./foo'
 	)
 '
 
-test_expect_failure '"git submodule sync" handles origin URL of the form ./foo/bar' '
+test_expect_success '"git submodule sync" handles origin URL of the form ./foo/bar' '
 	(cd relative-clone &&
 	 git remote set-url origin ./foo/bar &&
 	 git submodule sync &&