[PATCH v2 4/4] t0302: test credential-store support for XDG_CONFIG_HOME

[Paul Tan <pyokagan@gmail.com>]

t0302 now tests git-credential-store's support for the XDG user-specific
configuration file $XDG_CONFIG_HOME/git/credentials. Specifically:

* Ensure that the XDG file is strictly opt-in. It should not be created
  by git at all times if it does not exist.

* On the flip side, if the XDG file exists, ~/.git-credentials should
  not be created at all times.

* If both the XDG file and ~/.git-credentials exists, then both files
  should be used for credential lookups. However, credentials should
  only be written to ~/.git-credentials.

* Credentials must be erased from both files.

* $XDG_CONFIG_HOME can be a custom directory set by the user as per the
  XDG base directory specification. Test that git-credential-store
  respects that, but defaults to "~/.config/git/credentials" if it does
  not exist or is empty.

Helped-by: Matthieu Moy <Matthieu.Moy@grenoble-inp.fr>
Helped-by: Junio C Hamano <gitster@pobox.com>
Signed-off-by: Paul Tan <pyokagan@gmail.com>
---
 t/t0302-credential-store.sh | 92 +++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 92 insertions(+)

diff --git a/t/t0302-credential-store.sh b/t/t0302-credential-store.sh
index f61b40c..7fe832d 100755
--- a/t/t0302-credential-store.sh
+++ b/t/t0302-credential-store.sh
@@ -5,5 +5,97 @@ test_description='credential-store tests'
 . "$TEST_DIRECTORY"/lib-credential.sh
 
 helper_test store
+test_expect_success '~/.git-credentials is written to when xdg credentials file does not exist' '
+	test -s "$HOME/.git-credentials"
+'
+test_expect_success 'xdg credentials file will not be created if it does not exist' '
+	test_path_is_missing "$HOME/.config/git/credentials"
+'
+test_expect_success 'create $XDG_CONFIG_HOME/git/credentials file' '
+	test_might_fail rm "$HOME/.git-credentials" &&
+	mkdir -p "$HOME/.config/git" &&
+	>"$HOME/.config/git/credentials"
+'
+helper_test store
+test_expect_success 'xdg credentials file will be written to if it exists' '
+	test -s "$HOME/.config/git/credentials"
+'
+test_expect_success '~/.git-credentials will not be created if xdg credentials file exists' '
+	test_path_is_missing "$HOME/.git-credentials"
+'
+test_expect_success 'set up custom XDG_CONFIG_HOME credential file' '
+	XDG_CONFIG_HOME="$HOME/xdg" && export XDG_CONFIG_HOME &&
+	mkdir -p "$HOME/xdg/git" &&
+	>"$HOME/xdg/git/credentials" &&
+	>"$HOME/.config/git/credentials"
+'
+helper_test store
+test_expect_success 'custom XDG_CONFIG_HOME credentials file will be written to if it exists' '
+	unset XDG_CONFIG_HOME &&
+	test -s "$HOME/xdg/git/credentials"
+'
+test_expect_success '~/.config/git/credentials file will not be written to if a custom XDG_CONFIG_HOME is set' '
+	test_must_be_empty "$HOME/.config/git/credentials"
+'
+test_expect_success '~/.git-credentials will not be created if xdg credentials file exists' '
+	test_path_is_missing "$HOME/.git-credentials"
+'
+test_expect_success 'get: return credentials from home file if matches are found in both home and xdg files' '
+	mkdir -p "$HOME/.config/git" &&
+	echo "https://xdg-user:xdg-pass@example.com" >"$HOME/.config/git/credentials" &&
+	echo "https://home-user:home-pass@example.com" >"$HOME/.git-credentials" &&
+	check fill store <<-\EOF
+	protocol=https
+	host=example.com
+	--
+	protocol=https
+	host=example.com
+	username=home-user
+	password=home-pass
+	--
+	EOF
+'
+test_expect_success 'get: return credentials from xdg file if the home files do not have them' '
+	mkdir -p "$HOME/.config/git" &&
+	>"$HOME/.git-credentials" &&
+	echo "https://home-user:home-pass@example.com" >"$HOME/.config/git/credentials" &&
+	check fill store <<-\EOF
+	protocol=https
+	host=example.com
+	--
+	protocol=https
+	host=example.com
+	username=home-user
+	password=home-pass
+	--
+	EOF
+'
+test_expect_success 'get: return credentials from home file if xdg files are unreadable' '
+	mkdir -p "$HOME/.config/git" &&
+	echo "https://xdg-user:xdg-pass@example.com" >"$HOME/.config/git/credentials" &&
+	echo "https://home-user:home-pass@example.com" >"$HOME/.git-credentials" &&
+	chmod -r "$HOME/.config/git/credentials" &&
+	check fill store <<-\EOF
+	protocol=https
+	host=example.com
+	--
+	protocol=https
+	host=example.com
+	username=home-user
+	password=home-pass
+	--
+	EOF
+'
+test_expect_success 'erase: erase matching credentials from both xdg and home files' '
+	mkdir -p "$HOME/.config/git" &&
+	echo "https://xdg-user:xdg-pass@example.com" >"$HOME/.config/git/credentials" &&
+	echo "https://home-user:home-pass@example.com" >"$HOME/.git-credentials" &&
+	check reject store <<-\EOF
+	protocol=https
+	host=example.com
+	EOF
+	test_must_be_empty "$HOME/.config/git/credentials" &&
+	test_must_be_empty "$HOME/.git-credentials"
+'
 
 test_done
-- 
2.1.4