[PATCHv7 4/4] Write to $XDG_CONFIG_HOME/git/config file

[Huynh Khoi Nguyen Nguyen <Huynh-Khoi-Nguyen.Nguyen@ensimag.imag.fr>]

Git will be able to write to $XDG_CONFIG_HOME/git/config, a new
configuration file following XDG specification, if:
- this file already exists, and
- $HOME/.gitconfig file doesn't, and
- global option is used.
Otherwise Git writes to $HOME/.gitconfig with global option, as usual.
If you don't create $XDG_CONFIG_HOME/git/config, there is absolutely
no change. Users can use this new file only if they want.
If $XDG_CONFIG_HOME is either not set or empty, $HOME/.config/git/config
will be used.
Advice for users who often come back to an old version of Git:
you shouldn't create this file.

Signed-off-by: Huynh Khoi Nguyen Nguyen <Huynh-Khoi-Nguyen.Nguyen@ensimag.imag.fr>
Signed-off-by: Valentin Duperray <Valentin.Duperray@ensimag.imag.fr>
Signed-off-by: Franck Jonas <Franck.Jonas@ensimag.imag.fr>
Signed-off-by: Lucien Kong <Lucien.Kong@ensimag.imag.fr>
Signed-off-by: Thomas Nguy <Thomas.Nguy@ensimag.imag.fr>
Signed-off-by: Matthieu Moy <Matthieu.Moy@grenoble-inp.fr>
---
 Documentation/git-config.txt |    3 ++-
 builtin/config.c             |    5 +----
 t/t1306-xdg-files.sh         |   30 ++++++++++++++++++++++++++++++
 3 files changed, 33 insertions(+), 5 deletions(-)

diff --git a/Documentation/git-config.txt b/Documentation/git-config.txt
index 7e344a2..a2b4786 100644
--- a/Documentation/git-config.txt
+++ b/Documentation/git-config.txt
@@ -97,7 +97,8 @@ OPTIONS
 
 --global::
 	For writing options: write to global ~/.gitconfig file rather than
-	the repository .git/config.
+	the repository .git/config, write to $XDG_CONFIG_HOME/git/config file
+	if this file exists and ~/.gitconfig file doesn't.
 +
 For reading options: read only from global ~/.gitconfig and from
 $XDG_CONFIG_HOME/git/config rather than from all available files.
diff --git a/builtin/config.c b/builtin/config.c
index da54fd1..e8e1c0a 100644
--- a/builtin/config.c
+++ b/builtin/config.c
@@ -387,10 +387,7 @@ int cmd_config(int argc, const char **argv, const char *prefix)
 
 		home_config_paths(&user_config, &xdg_config, "config");
 
-		if (access(user_config, R_OK) && !access(xdg_config, R_OK) &&
-		    (actions == ACTION_LIST ||
-		     actions == ACTION_GET_COLOR ||
-		     actions == ACTION_GET_COLORBOOL))
+		if (access(user_config, R_OK) && !access(xdg_config, R_OK))
 			given_config_file = xdg_config;
 		else if (user_config)
 			given_config_file = user_config;
diff --git a/t/t1306-xdg-files.sh b/t/t1306-xdg-files.sh
index e8cd78a..3c75c3f 100755
--- a/t/t1306-xdg-files.sh
+++ b/t/t1306-xdg-files.sh
@@ -125,4 +125,34 @@ test_expect_success 'Checking attributes in a non-XDG global attributes file' '
 '
 
 
+test_expect_success 'write: xdg file exists and ~/.gitconfig doesn'\''t' '
+	mkdir -p "$HOME"/.config/git &&
+	>"$HOME"/.config/git/config &&
+	test_might_fail rm "$HOME"/.gitconfig &&
+	git config --global user.name "write_config" &&
+	echo "[user]" >expected &&
+	echo "	name = write_config" >>expected &&
+	test_cmp expected "$HOME"/.config/git/config
+'
+
+
+test_expect_success 'write: xdg file exists and ~/.gitconfig exists' '
+	>"$HOME"/.gitconfig &&
+	git config --global user.name "write_gitconfig" &&
+	echo "[user]" >expected &&
+	echo "	name = write_gitconfig" >>expected &&
+	test_cmp expected "$HOME"/.gitconfig
+'
+
+
+test_expect_success 'write: ~/.config/git/ exists and config file doesn'\''t' '
+	test_might_fail rm "$HOME"/.gitconfig &&
+	test_might_fail rm "$HOME"/.config/git/config &&
+	git config --global user.name "write_gitconfig" &&
+	echo "[user]" >expected &&
+	echo "	name = write_gitconfig" >>expected &&
+	test_cmp expected "$HOME"/.gitconfig
+'
+
+
 test_done
-- 
1.7.8