[PATCH 02/15] lib-submodule-update.sh: do not use ./. as submodule remote

[Stefan Beller <sbeller@google.com>]

Adding the repository itself as a submodule does not make sense in the
real world. In our test suite we used to do that out of convenience in
some tests as the current repository has easiest access for setting up
'just a submodule'.

However this doesn't quite test the real world, so let's do not follow
this pattern any further and actually create an independent repository
that we can use as a submodule.

When using './.' as the remote the superproject and submodule share the
same objects, such that testing if a given sha1 is a valid commit works
in either repository.  As running commands in an unpopulated submodule
fall back to the superproject, this happens in `reset_work_tree_to`
to determine if we need to populate the submodule. Fix this bug by
checking in the actual remote now.

Signed-off-by: Stefan Beller <sbeller@google.com>
---
 t/lib-submodule-update.sh | 15 +++++++++++++--
 1 file changed, 13 insertions(+), 2 deletions(-)

diff --git a/t/lib-submodule-update.sh b/t/lib-submodule-update.sh
index 5df528ea81..c0d6325133 100755
--- a/t/lib-submodule-update.sh
+++ b/t/lib-submodule-update.sh
@@ -37,6 +37,17 @@
 #
 
 create_lib_submodule_repo () {
+	git init submodule_update_sub1 &&
+	(
+		cd submodule_update_sub1 &&
+		echo "expect" >>.gitignore &&
+		echo "actual" >>.gitignore &&
+		echo "x" >file1 &&
+		echo "y" >file2 &&
+		git add .gitignore file1 file2 &&
+		git commit -m "Base inside first submodule" &&
+		git branch "no_submodule"
+	) &&
 	git init submodule_update_repo &&
 	(
 		cd submodule_update_repo &&
@@ -49,7 +60,7 @@ create_lib_submodule_repo () {
 		git branch "no_submodule" &&
 
 		git checkout -b "add_sub1" &&
-		git submodule add ./. sub1 &&
+		git submodule add ../submodule_update_sub1 sub1 &&
 		git config -f .gitmodules submodule.sub1.ignore all &&
 		git config submodule.sub1.ignore all &&
 		git add .gitmodules &&
@@ -162,7 +173,7 @@ reset_work_tree_to () {
 		test_must_be_empty actual &&
 		sha1=$(git rev-parse --revs-only HEAD:sub1) &&
 		if test -n "$sha1" &&
-		   test $(cd "sub1" && git rev-parse --verify "$sha1^{commit}")
+		   test $(cd "../submodule_update_sub1" && git rev-parse --verify "$sha1^{commit}")
 		then
 			git submodule update --init --recursive "sub1"
 		fi
-- 
2.12.0.rc1.16.ge4278d41a0.dirty