[PATCH v2 1/3] init: correct re-initialization from a linked worktree

["Nguyễn Thái Ngọc Duy" <pclouds@gmail.com>]

When 'git init' is called from a linked worktree, we treat '.git'
dir (which is $GIT_COMMON_DIR/worktrees/something) as the main
'.git' (i.e. $GIT_COMMON_DIR) and populate the whole repository skeleton
in there. It does not harm anything (*) but it is still wrong.

Since 'git init' calls set_git_dir() at preparation time, which
indirectly calls get_common_dir() and correctly detects multiple
worktree setup, all git_path_buf() calls in create_default_files() will
return correct paths in both single and multiple worktree setups. The
only thing left is copy_templates(), which targets $GIT_DIR, not
$GIT_COMMON_DIR.

Fix that with get_git_common_dir(). This function will return $GIT_DIR
in single-worktree setup, so we don't have to make a special case for
multiple-worktree here.

(*) It does in fact, thanks to another bug. More on that later.

Noticed-by: Max Nordlund <max.nordlund@sqore.com>
Helped-by: Michael J Gruber <git@drmicha.warpmail.net>
Signed-off-by: Nguyễn Thái Ngọc Duy <pclouds@gmail.com>
---
 builtin/init-db.c |  2 +-
 t/t0001-init.sh   | 15 +++++++++++++++
 2 files changed, 16 insertions(+), 1 deletion(-)

diff --git a/builtin/init-db.c b/builtin/init-db.c
index cc09fca..d5d7558 100644
--- a/builtin/init-db.c
+++ b/builtin/init-db.c
@@ -138,7 +138,7 @@ static void copy_templates(const char *template_dir)
 		goto close_free_return;
 	}
 
-	strbuf_addstr(&path, get_git_dir());
+	strbuf_addstr(&path, get_git_common_dir());
 	strbuf_complete(&path, '/');
 	copy_templates_1(&path, &template_path, dir);
 close_free_return:
diff --git a/t/t0001-init.sh b/t/t0001-init.sh
index 8ffbbea..488564b 100755
--- a/t/t0001-init.sh
+++ b/t/t0001-init.sh
@@ -393,4 +393,19 @@ test_expect_success 'remote init from does not use config from cwd' '
 	test_cmp expect actual
 '
 
+test_expect_success 're-init from a linked worktree' '
+	git init main-worktree &&
+	(
+		cd main-worktree &&
+		test_commit first &&
+		git worktree add ../linked-worktree &&
+		mv .git/info/exclude expected-exclude &&
+		find .git/worktrees -print | sort >expected &&
+		git -C ../linked-worktree init &&
+		test_cmp expected-exclude .git/info/exclude &&
+		find .git/worktrees -print | sort >actual &&
+		test_cmp expected actual
+	)
+'
+
 test_done
-- 
2.8.2.524.g6ff3d78