Merge branch 'mm/config-xdg'

Finishing touches to the XDG support (new feature for 1.7.12) and
tests.

* mm/config-xdg:
  t1306: check that XDG_CONFIG_HOME works
  ignore: make sure we have an xdg path before using it
  attr: make sure we have an xdg path before using it
  test-lib.sh: unset XDG_CONFIG_HOME

attr.c

@@ -520,11 +520,13 @@ static void bootstrap_attr_stack(void)
 		home_config_paths(NULL, &xdg_attributes_file, "attributes");
 		git_attributes_file = xdg_attributes_file;
 	}
-	elem = read_attr_from_file(git_attributes_file, 1);
-	if (elem) {
-		elem->origin = NULL;
-		elem->prev = attr_stack;
-		attr_stack = elem;
+	if (git_attributes_file) {
+		elem = read_attr_from_file(git_attributes_file, 1);
+		if (elem) {
+			elem->origin = NULL;
+			elem->prev = attr_stack;
+			attr_stack = elem;
+		}
 	}
 
 	if (!is_bare_repository() || direction == GIT_ATTR_INDEX) {

dir.c

@@ -1313,7 +1313,7 @@ void setup_standard_excludes(struct dir_struct *dir)
 	}
 	if (!access(path, R_OK))
 		add_excludes_from_file(dir, path);
-	if (!access(excludes_file, R_OK))
+	if (excludes_file && !access(excludes_file, R_OK))
 		add_excludes_from_file(dir, excludes_file);
 }
 

t/t1306-xdg-files.sh

@@ -38,6 +38,13 @@ test_expect_success 'read with --get: xdg file exists and ~/.gitconfig doesn'\''
 	test_cmp expected actual
 '
 
+test_expect_success '"$XDG_CONFIG_HOME overrides $HOME/.config/git' '
+	mkdir -p "$HOME"/xdg/git &&
+	echo "[user]name = in_xdg" >"$HOME"/xdg/git/config &&
+	echo in_xdg >expected &&
+	XDG_CONFIG_HOME="$HOME"/xdg git config --get-all user.name >actual &&
+	test_cmp expected actual
+'
 
 test_expect_success 'read with --get: xdg file exists and ~/.gitconfig exists' '
 	>.gitconfig &&
@@ -80,6 +87,17 @@ test_expect_success 'Exclusion of a file in the XDG ignore file' '
 	test_must_fail git add to_be_excluded
 '
 
+test_expect_success '$XDG_CONFIG_HOME overrides $HOME/.config/git/ignore' '
+	mkdir -p "$HOME"/xdg/git &&
+	echo content >excluded_by_xdg_only &&
+	echo excluded_by_xdg_only >"$HOME"/xdg/git/ignore &&
+	test_when_finished "git read-tree --empty" &&
+	(XDG_CONFIG_HOME="$HOME/xdg" &&
+	 export XDG_CONFIG_HOME &&
+	 git add to_be_excluded &&
+	 test_must_fail git add excluded_by_xdg_only
+	)
+'
 
 test_expect_success 'Exclusion in both XDG and local ignore files' '
 	echo to_be_excluded >.gitignore &&
@@ -95,6 +113,13 @@ test_expect_success 'Exclusion in a non-XDG global ignore file' '
 	test_must_fail git add to_be_excluded
 '
 
+test_expect_success 'Checking XDG ignore file when HOME is unset' '
+	>expected &&
+	(sane_unset HOME &&
+	 git config --unset core.excludesfile &&
+	 git ls-files --exclude-standard --ignored >actual) &&
+	test_cmp expected actual
+'
 
 test_expect_success 'Checking attributes in the XDG attributes file' '
 	echo foo >f &&
@@ -106,6 +131,20 @@ test_expect_success 'Checking attributes in the XDG attributes file' '
 	test_cmp expected actual
 '
 
+test_expect_success 'Checking XDG attributes when HOME is unset' '
+	>expected &&
+	(sane_unset HOME &&
+	 git check-attr -a f >actual) &&
+	test_cmp expected actual
+'
+
+test_expect_success '$XDG_CONFIG_HOME overrides $HOME/.config/git/attributes' '
+	mkdir -p "$HOME"/xdg/git &&
+	echo "f attr_f=xdg" >"$HOME"/xdg/git/attributes &&
+	echo "f: attr_f: xdg" >expected &&
+	XDG_CONFIG_HOME="$HOME/xdg" git check-attr -a f >actual &&
+	test_cmp expected actual
+'
 
 test_expect_success 'Checking attributes in both XDG and local attributes files' '
 	echo "f -attr_f" >.gitattributes &&

t/test-lib.sh

@@ -61,6 +61,7 @@ unset VISUAL EMAIL LANGUAGE COLUMNS $(perl -e '
 	my @vars = grep(/^GIT_/ && !/^GIT_($ok)/o, @env);
 	print join("\n", @vars);
 ')
+unset XDG_CONFIG_HOME
 GIT_AUTHOR_EMAIL=author@example.com
 GIT_AUTHOR_NAME='A U Thor'
 GIT_COMMITTER_EMAIL=committer@example.com