Merge branch 'jk/no-looking-at-dotgit-outside-repo'

Clean up fallouts from recent tightening of the set-up sequence,
where Git barfs when repository information is accessed without
first ensuring that it was started in a repository.

* jk/no-looking-at-dotgit-outside-repo:
  test-read-cache: setup git dir
  has_sha1_file: don't bother if we are not in a repository

sha1_file.c

@@ -3481,6 +3481,8 @@ int has_sha1_file_with_flags(const unsigned char *sha1, int flags)
 {
 	struct pack_entry e;
 
+	if (!startup_info->have_repository)
+		return 0;
 	if (find_pack_entry(sha1, &e))
 		return 1;
 	if (has_loose_object(sha1))

t/helper/test-read-cache.c

@@ -5,6 +5,7 @@ int cmd_main(int argc, const char **argv)
 	int i, cnt = 1;
 	if (argc == 2)
 		cnt = strtol(argv[1], NULL, 0);
+	setup_git_directory();
 	for (i = 0; i < cnt; i++) {
 		read_cache();
 		discard_cache();