[PATCH 2/4] submodule.c: uninitialized submodules are ignored in recursive commands

[Stefan Beller <sbeller@google.com>]

This was an oversight when working on the working tree modifying commands
recursing into submodules.

To test for uninitialized submodules, introduce another submodule, that is
uninitialized in the actual tests. By adding it to the branch "add_sub1",
which is the starting point of all other branches, we have wide coverage.

Signed-off-by: Stefan Beller <sbeller@google.com>
---
 submodule.c               | 3 +++
 t/lib-submodule-update.sh | 1 +
 2 files changed, 4 insertions(+)

diff --git a/submodule.c b/submodule.c
index c52d6634c5..2fa42519a4 100644
--- a/submodule.c
+++ b/submodule.c
@@ -1332,6 +1332,9 @@ int submodule_move_head(const char *path,
 	struct child_process cp = CHILD_PROCESS_INIT;
 	const struct submodule *sub;
 
+	if (!is_submodule_initialized(path))
+		return 0;
+
 	sub = submodule_from_path(null_sha1, path);
 
 	if (!sub)
diff --git a/t/lib-submodule-update.sh b/t/lib-submodule-update.sh
index fb4f7b014e..22dd9e060c 100755
--- a/t/lib-submodule-update.sh
+++ b/t/lib-submodule-update.sh
@@ -73,6 +73,7 @@ create_lib_submodule_repo () {
 
 		git checkout -b "add_sub1" &&
 		git submodule add ../submodule_update_sub1 sub1 &&
+		git submodule add ../submodule_update_sub1 uninitialized_sub &&
 		git config -f .gitmodules submodule.sub1.ignore all &&
 		git config submodule.sub1.ignore all &&
 		git add .gitmodules &&
-- 
2.12.2.603.g7b28dc31ba