[PATCH] mv: allow moving nested submodules

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When directories are moved using `git mv` all files in the directory
have been just moved, but no further action was taken on them. This
was done by assigning the mode = WORKING_DIRECTORY to the files
inside a moved directory.

submodules however need to update their link to the git directory as
well as updates to the .gitmodules file. By removing the condition of
`mode != INDEX` (the remaining modes are BOTH and WORKING_DIRECTORY) for
the required submodule actions, we perform these for submodules in a
moved directory.

Signed-off-by: Stefan Beller <sbeller@xxxxxxxxxx>
---
 builtin/mv.c  |  7 +++++--
 t/t7001-mv.sh | 16 ++++++++++++++++
 2 files changed, 21 insertions(+), 2 deletions(-)

diff --git a/builtin/mv.c b/builtin/mv.c
index aeae855..65fff11 100644
--- a/builtin/mv.c
+++ b/builtin/mv.c
@@ -252,9 +252,12 @@ int cmd_mv(int argc, const char **argv, const char *prefix)
 		int pos;
 		if (show_only || verbose)
 			printf(_("Renaming %s to %s\n"), src, dst);
-		if (!show_only && mode != INDEX) {
-			if (rename(src, dst) < 0 && !ignore_errors)
+		if (!show_only) {
+			if (mode != INDEX &&
+			    rename(src, dst) < 0 &&
+			    !ignore_errors)
 				die_errno(_("renaming '%s' failed"), src);
+
 			if (submodule_gitfile[i]) {
 				if (submodule_gitfile[i] != SUBMODULE_WITH_GITDIR)
 					connect_work_tree_and_git_dir(dst, submodule_gitfile[i]);
diff --git a/t/t7001-mv.sh b/t/t7001-mv.sh
index 4008fae..4a2570e 100755
--- a/t/t7001-mv.sh
+++ b/t/t7001-mv.sh
@@ -292,6 +292,9 @@ test_expect_success 'setup submodule' '
 	echo content >file &&
 	git add file &&
 	git commit -m "added sub and file" &&
+	mkdir -p deep/directory/hierachy &&
+	git submodule add ./. deep/directory/hierachy/sub &&
+	git commit -m "added another submodule" &&
 	git branch submodule
 '
 
@@ -475,4 +478,17 @@ test_expect_success 'mv -k does not accidentally destroy submodules' '
 	git checkout .
 '
 
+test_expect_success 'moving a submodule in nested directories' '
+	(
+		cd deep &&
+		git mv directory ../ &&
+		# git status would fail if the update of linking git dir to
+		# work dir of the submodule failed.
+		git status &&
+		git config -f ../.gitmodules submodule.deep/directory/hierachy/sub.path >../actual &&
+		echo "directory/hierachy/sub" >../expect
+	) &&
+	test_cmp actual expect
+'
+
 test_done
-- 
2.8.0.26.gba39a1b.dirty

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