clean: make is_git_repository a public function

We have always had is_git_directory(), for looking at a
specific directory to see if it contains a git repo. In
0179ca7 (clean: improve performance when removing lots of
directories, 2015-06-15), we added is_git_repository() which
checks for a non-bare repository by looking at its ".git"
entry.

However, the fix in 0179ca7 needs to be applied other
places, too. Let's make this new helper globally available.
We need to give it a better name, though, to avoid confusion
with is_git_directory(). This patch does that, documents
both functions with a comment to reduce confusion, and
removes the clean-specific references in the comments.

Based-on-a-patch-by: Andreas Krey <a.krey@gmx.de>
Signed-off-by: Jeff King <peff@peff.net>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

1 files changed, 1 insertions, 25 deletions

diff --git a/builtin/clean.c b/builtin/clean.c
index d7acb94a9..919157bc2 100644
--- a/builtin/clean.c
+++ b/builtin/clean.c
@@ -147,30 +147,6 @@ static int exclude_cb(const struct option *opt, const char *arg, int unset)
 	return 0;
 }
 
-/*
- * Return 1 if the given path is the root of a git repository or
- * submodule else 0. Will not return 1 for bare repositories with the
- * exception of creating a bare repository in "foo/.git" and calling
- * is_git_repository("foo").
- */
-static int is_git_repository(struct strbuf *path)
-{
-	int ret = 0;
-	int gitfile_error;
-	size_t orig_path_len = path->len;
-	assert(orig_path_len != 0);
-	strbuf_complete(path, '/');
-	strbuf_addstr(path, ".git");
-	if (read_gitfile_gently(path->buf, &gitfile_error) || is_git_directory(path->buf))
-		ret = 1;
-	if (gitfile_error == READ_GITFILE_ERR_OPEN_FAILED ||
-	    gitfile_error == READ_GITFILE_ERR_READ_FAILED)
-		ret = 1;  /* This could be a real .git file, take the
-			   * safe option and avoid cleaning */
-	strbuf_setlen(path, orig_path_len);
-	return ret;
-}
-
 static int remove_dirs(struct strbuf *path, const char *prefix, int force_flag,
 		int dry_run, int quiet, int *dir_gone)
 {
@@ -182,7 +158,7 @@ static int remove_dirs(struct strbuf *path, const char *prefix, int force_flag,
 
 	*dir_gone = 1;
 
-	if ((force_flag & REMOVE_DIR_KEEP_NESTED_GIT) && is_git_repository(path)) {
+	if ((force_flag & REMOVE_DIR_KEEP_NESTED_GIT) && is_nonbare_repository_dir(path)) {
 		if (!quiet) {
 			quote_path_relative(path->buf, prefix, &quoted);
 			printf(dry_run ?  _(msg_would_skip_git_dir) : _(msg_skip_git_dir),