[PATCH] Solve git-submodule issues with detached work trees

[Daniel Graña <dangra@xxxxxxxxx>]

A common way to track dotfiles with git is using GIT_DIR and
GIT_WORK_TREE to move repository out of ~/.git with something like:

    git init --bare ~/.dotfiles
    alias dotfiles="GIT_DIR=~/.dotfiles GIT_WORK_TREE=~ git"

    dotfiles add ~/.bashrc
    dotfiles commit -a -m "add my bashrc"
    ...

but git-submodule complains when trying to add submodules:

    dotfiles submodule add http://path.to/submodule
    fatal: working tree '/home/user' already exists.

    git --git-dir ~/.dotfiles submodule add http://path.to/submodule
    fatal: /usr/lib/git-core/git-submodule cannot be used without a
working tree.

Signed-off-by: Daniel Graña <dangra@xxxxxxxxx>
---
 git-submodule.sh                       |    7 +++-
 t/t7409-submodule-detached-worktree.sh |   61 ++++++++++++++++++++++++++++++++
 2 files changed, 66 insertions(+), 2 deletions(-)
 create mode 100755 t/t7409-submodule-detached-worktree.sh

diff --git a/git-submodule.sh b/git-submodule.sh
index 5629d87..88ee4ea 100755
--- a/git-submodule.sh
+++ b/git-submodule.sh
@@ -181,8 +181,11 @@ module_clone()
 		rm -f "$gitdir/index"
 	else
 		mkdir -p "$gitdir_base"
-		git clone $quiet -n ${reference:+"$reference"} \
-			--separate-git-dir "$gitdir" "$url" "$sm_path" ||
+		(
+			clear_local_git_env
+			git clone $quiet -n ${reference:+"$reference"} \
+				--separate-git-dir "$gitdir" "$url" "$sm_path"
+		) ||
 		die "$(eval_gettext "Clone of '\$url' into submodule path
'\$sm_path' failed")"
 	fi

diff --git a/t/t7409-submodule-detached-worktree.sh
b/t/t7409-submodule-detached-worktree.sh
new file mode 100755
index 0000000..db75642
--- /dev/null
+++ b/t/t7409-submodule-detached-worktree.sh
@@ -0,0 +1,61 @@
+#!/bin/sh
+#
+# Copyright (c) 2012 Daniel Graña
+#
+
+test_description='Test submodules on detached working tree
+
+This test verifies that "git submodule" initialization, update and
addition works
+on detahced working trees
+'
+
+TEST_NO_CREATE_REPO=1
+. ./test-lib.sh
+
+test_expect_success 'submodule on detached working tree' '
+	git init --bare remote &&
+	test_create_repo bundle1 &&
+	(cd bundle1 && test_commit "shoot") &&
+	mkdir home &&
+	(
+		cd home &&
+		export GIT_WORK_TREE="$(pwd)" GIT_DIR="$(pwd)/.dotfiles" &&
+		git clone --bare ../remote .dotfiles &&
+		git submodule add ../bundle1 .vim/bundle/sogood &&
+		test_commit "sogood" &&
+		git push origin master
+	) &&
+	mkdir home2 &&
+	(
+		cd home2 &&
+		export GIT_WORK_TREE="$(pwd)" GIT_DIR="$(pwd)/.dotfiles" &&
+		git clone --bare ../remote .dotfiles &&
+		git submodule update --init
+	)
+'
+
+test_expect_success 'submodule on detached working pointed by core.worktree' '
+	mkdir home3 &&
+	(
+		cd home3 &&
+		export GIT_DIR="$(pwd)/.dotfiles" &&
+		git clone --bare ../remote "$GIT_DIR" &&
+		git config core.bare false &&
+		git config core.worktree .. &&
+		git submodule add ../bundle1 .vim/bundle/dupe &&
+		test_commit "dupe" &&
+		git push origin master
+	) &&
+	(
+		cd home &&
+		export GIT_DIR="$(pwd)/.dotfiles" &&
+		git config core.bare false &&
+		git config core.worktree .. &&
+		git pull &&
+		git submodule update &&
+		git submodule status &&
+		test -d .vim/bundle/dupe
+	)
+'
+
+test_done
-- 
1.7.5.4
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