[PATCH 07/21] completion: ensure that the repository path given on the command line exists

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The __gitdir() helper function stays silent and returns with error
when it can't find a repository or when the repository given via
$GIT_DIR doesn't exist.

This is not the case, however, when the path in $__git_dir, i.e. the
path to the repository specified on the command line as 'git
--git-dir=<path>', doesn't exist: __gitdir() still outputs it and
returns with success, making completion functions believe that they
operate on an existing repository.

Check that the path in $__git_dir exists and return with error if it
doesn't.

Signed-off-by: SZEDER Gábor <szeder@xxxxxxxxxx>
---
 contrib/completion/git-completion.bash | 1 +
 t/t9902-completion.sh                  | 8 ++++++++
 2 files changed, 9 insertions(+)

diff --git a/contrib/completion/git-completion.bash b/contrib/completion/git-completion.bash
index 0e1fd778bfe8..0ec988c0ee26 100644
--- a/contrib/completion/git-completion.bash
+++ b/contrib/completion/git-completion.bash
@@ -40,6 +40,7 @@ __gitdir ()
 {
 	if [ -z "${1-}" ]; then
 		if [ -n "${__git_dir-}" ]; then
+			test -d "$__git_dir" || return 1
 			echo "$__git_dir"
 		elif [ -n "${GIT_DIR-}" ]; then
 			test -d "${GIT_DIR-}" || return 1
diff --git a/t/t9902-completion.sh b/t/t9902-completion.sh
index 7ab398568594..809856110235 100755
--- a/t/t9902-completion.sh
+++ b/t/t9902-completion.sh
@@ -211,6 +211,14 @@ test_expect_success '__gitdir - $GIT_DIR set while .git directory in parent' '
 	test_cmp expected "$actual"
 '
 
+test_expect_success '__gitdir - non-existing path in $__git_dir' '
+	(
+		__git_dir="non-existing" &&
+		test_must_fail __gitdir >"$actual"
+	) &&
+	test_must_be_empty "$actual"
+'
+
 test_expect_success '__gitdir - non-existing $GIT_DIR' '
 	(
 		GIT_DIR="$ROOT/non-existing" &&
-- 
2.7.2.410.g92cb358

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