[PATCH v3 4/4] submodule: support superproject origin URLs of the form foo/bar

[Jon Seymour <jon.seymour@gmail.com>]

When the origin URL of a superproject is of the form foo/bar, submodule
operations such as add, sync or init will configure the URL of any
submodule with an origin URL that points at the incorrect location.

Origin URLs of this form are not expected in most cases, since
the origin URL of a repo will usually point to a location that is not
nested within the current working tree.

However, the situation can arise when the physical location
of an upstream repo is managed with a symbolic link nested within
the working tree itself.

For example, suppose that a toolset is installed in ~/tools and
~/tools/mnt/usb is a occasionally used as the origin for a refresh of the
toolset. Different users with different USB devices may map ~/tools/mnt/usb
to a different subdirectory of /media, but the auto-update function of the
toolset may simply pull an update from mnt/usb, assuming that the user has
done what is required to initialise mnt/usb to refer to the correct subdirectory
of /media.

Signed-off-by: Jon Seymour <jon.seymour@gmail.com>
---
 git-submodule.sh           | 2 ++
 t/t7400-submodule-basic.sh | 2 +-
 2 files changed, 3 insertions(+), 1 deletion(-)

diff --git a/git-submodule.sh b/git-submodule.sh
index 230c219..b8a7403 100755
--- a/git-submodule.sh
+++ b/git-submodule.sh
@@ -37,6 +37,7 @@ resolve_relative_url ()
 	remoteurl=$(git config "remote.$remote.url") ||
 		remoteurl=$(pwd) # the repository is its own authoritative upstream
 	url="$1"
+	remoteurl=$(echo "$remoteurl" | sed "s|^[^/][^:]*\$|./&|")
 	remoteurl=${remoteurl%/}
 	sep=/
 	while test -n "$url"
@@ -47,6 +48,7 @@ resolve_relative_url ()
 			case "$remoteurl" in
 			.*/*)
 				up_path="$(echo "$2" | sed "s/[^/]*/../g")"
+				remoteurl=${remoteurl#./}
 				remoteurl="${up_path%/}/${remoteurl%/*}"
 				;;
 			*/*)
diff --git a/t/t7400-submodule-basic.sh b/t/t7400-submodule-basic.sh
index 71f30d8..a4a8363 100755
--- a/t/t7400-submodule-basic.sh
+++ b/t/t7400-submodule-basic.sh
@@ -533,7 +533,7 @@ test_expect_sucess 'test that submodule add creates the correct url when super o
 		test "$(git config submodule.sub.url)" = ../../relative/subrepo
 	)
 '
-test_expect_failure 'test that submodule add creates the correct url when super origin url is relative/repo' '
+test_expect_success 'test that submodule add creates the correct url when super origin url is relative/repo' '
 	mkdir reladd &&
 	(
 		cd reladd &&
-- 
1.7.10.2.594.g5c52315