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>

3 files changed, 18 insertions, 8 deletions

diff --git a/git-submodule.sh b/git-submodule.sh
index 0a3e1465e3..b0b6ccbe72 100755
--- a/git-submodule.sh
+++ b/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#./}"
 }
 
 #
diff --git a/t/t7400-submodule-basic.sh b/t/t7400-submodule-basic.sh
index 09e2b9bf16..a899e6dbf5 100755
--- a/t/t7400-submodule-basic.sh
+++ b/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 &&
diff --git a/t/t7403-submodule-sync.sh b/t/t7403-submodule-sync.sh
index 98bc74a4e9..524d5c1b21 100755
--- a/t/t7403-submodule-sync.sh
+++ b/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 &&