[PATCH] ignore: info/exclude should trump core.excludesfile

[Junio C Hamano <gitster@pobox.com>]

$GIT_DIR/info/exclude and core.excludesfile (which falls back to
$XDG_HOME/git/ignore) are both ways to override the ignore pattern
lists given by the project in .gitignore files.  The former, which
is per-repository personal preference, should take precedence over
the latter, which is a personal preference default across different
repositories that are accessed from that machine.  The existing
documentation also agrees.

However, the precedence order was screwed up between these two from
the very beginning when 896bdfa2 (add: Support specifying an
excludes file with a configuration variable, 2007-02-27) introduced
core.excludesfile variable.

Noticed-by: Yohei Endo <yoheie@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
---

 * This is done on an old codebase and may not apply cleanly to more
   modern codebase easily.

 dir.c              | 10 +++++++---
 t/t0008-ignores.sh | 10 ++++++++++
 2 files changed, 17 insertions(+), 3 deletions(-)

diff --git a/dir.c b/dir.c
index 23b6de4..e67b6f9 100644
--- a/dir.c
+++ b/dir.c
@@ -1530,15 +1530,19 @@ void setup_standard_excludes(struct dir_struct *dir)
 	char *xdg_path;
 
 	dir->exclude_per_dir = ".gitignore";
-	path = git_path("info/exclude");
+
+	/* core.excludefile defaulting to $XDG_HOME/git/ignore */
 	if (!excludes_file) {
 		home_config_paths(NULL, &xdg_path, "ignore");
 		excludes_file = xdg_path;
 	}
-	if (!access_or_warn(path, R_OK, 0))
-		add_excludes_from_file(dir, path);
 	if (excludes_file && !access_or_warn(excludes_file, R_OK, 0))
 		add_excludes_from_file(dir, excludes_file);
+
+	/* per repository user preference */
+	path = git_path("info/exclude");
+	if (!access_or_warn(path, R_OK, 0))
+		add_excludes_from_file(dir, path);
 }
 
 int remove_path(const char *name)
diff --git a/t/t0008-ignores.sh b/t/t0008-ignores.sh
index b4d98e6..38405de 100755
--- a/t/t0008-ignores.sh
+++ b/t/t0008-ignores.sh
@@ -775,4 +775,14 @@ test_expect_success PIPE 'streaming support for --stdin' '
 	echo "$response" | grep "^::	two"
 '
 
+test_expect_success 'info/exclude trumps core.excludesfile' '
+	echo >>global-excludes usually-ignored &&
+	echo >>.git/info/exclude "!usually-ignored" &&
+	>usually-ignored &&
+	echo "?? usually-ignored" >expect &&
+
+	git status --porcelain usually-ignored >actual &&
+	test_cmp expect actual
+'
+
 test_done
-- 
2.4.0-rc3-227-gd45ce82