[PATCH 1/7] read info/{attributes,exclude} only when in repository

[Jeff King <peff@peff.net>]

The low-level attribute and gitignore code will try to look
in $GIT_DIR/info for any repo-level configuration files,
even if we have not actually determined that we are in a
repository (e.g., running "git grep --no-index"). In such a
case they end up looking for ".git/info/attributes", etc.

This is generally harmless, as such a file is unlikely to
exist outside of a repository, but it's still conceptually
the wrong thing to do.

Let's detect this situation explicitly and skip reading the
file (i.e., the same behavior we'd get if we were in a
repository and the file did not exist).

Signed-off-by: Jeff King <peff@peff.net>
---
 attr.c |  6 +++++-
 dir.c  | 12 ++++++------
 2 files changed, 11 insertions(+), 7 deletions(-)

diff --git a/attr.c b/attr.c
index eec5d7d..1fcf042 100644
--- a/attr.c
+++ b/attr.c
@@ -531,7 +531,11 @@ static void bootstrap_attr_stack(void)
 		debug_push(elem);
 	}
 
-	elem = read_attr_from_file(git_path_info_attributes(), 1);
+	if (startup_info->have_repository)
+		elem = read_attr_from_file(git_path_info_attributes(), 1);
+	else
+		elem = NULL;
+
 	if (!elem)
 		elem = xcalloc(1, sizeof(*elem));
 	elem->origin = NULL;
diff --git a/dir.c b/dir.c
index 3bad1ad..6cde773 100644
--- a/dir.c
+++ b/dir.c
@@ -2195,8 +2195,6 @@ static GIT_PATH_FUNC(git_path_info_exclude, "info/exclude")
 
 void setup_standard_excludes(struct dir_struct *dir)
 {
-	const char *path;
-
 	dir->exclude_per_dir = ".gitignore";
 
 	/* core.excludefile defaulting to $XDG_HOME/git/ignore */
@@ -2207,10 +2205,12 @@ void setup_standard_excludes(struct dir_struct *dir)
 					 dir->untracked ? &dir->ss_excludes_file : NULL);
 
 	/* per repository user preference */
-	path = git_path_info_exclude();
-	if (!access_or_warn(path, R_OK, 0))
-		add_excludes_from_file_1(dir, path,
-					 dir->untracked ? &dir->ss_info_exclude : NULL);
+	if (startup_info->have_repository) {
+		const char *path = git_path_info_exclude();
+		if (!access_or_warn(path, R_OK, 0))
+			add_excludes_from_file_1(dir, path,
+						 dir->untracked ? &dir->ss_info_exclude : NULL);
+	}
 }
 
 int remove_path(const char *name)
-- 
2.10.1.619.g16351a7