[PATCH 1/2] setup: detect to be in $GIT_DIR with a new helper

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

Earlier, 45bb9162 (setup: allow cwd=.git w/ bareRepository=explicit,
2024-01-20) loosened the "safe.bareRepository=explicit" to allow Git
operations inside ".git/" directory in the root level of a working
tree of a non-bare repository.  It used the fact that the $GIT_DIR
you discover has ".git" as the last path component, if you descended
into ".git" of a non-bare repository.

Let's move the logic into a separate helper function.  We can
enhance this to detect the case where we are inside $GIT_DIR of a
secondary worktree (where "ends with .git" trick does not work) in
the next commit.

Signed-off-by: Junio C Hamano <gitster@pobox.com>
---
 setup.c | 7 ++++++-
 1 file changed, 6 insertions(+), 1 deletion(-)

diff --git a/setup.c b/setup.c
index a09b7b87ec..3081be4970 100644
--- a/setup.c
+++ b/setup.c
@@ -1231,6 +1231,11 @@ static const char *allowed_bare_repo_to_string(
 	return NULL;
 }
 
+static int is_repo_with_working_tree(const char *path)
+{
+	return ends_with_path_components(path, ".git");
+}
+
 /*
  * We cannot decide in this function whether we are in the work tree or
  * not, since the config can only be read _after_ this function was called.
@@ -1360,7 +1365,7 @@ static enum discovery_result setup_git_directory_gently_1(struct strbuf *dir,
 		if (is_git_directory(dir->buf)) {
 			trace2_data_string("setup", NULL, "implicit-bare-repository", dir->buf);
 			if (get_allowed_bare_repo() == ALLOWED_BARE_REPO_EXPLICIT &&
-			    !ends_with_path_components(dir->buf, ".git"))
+			    !is_repo_with_working_tree(dir->buf))
 				return GIT_DIR_DISALLOWED_BARE;
 			if (!ensure_valid_ownership(NULL, NULL, dir->buf, report))
 				return GIT_DIR_INVALID_OWNERSHIP;
-- 
2.44.0-165-ge09f1254c5