cache.h: expose the dying procedure for reading gitlinks

In a later patch we want to react to only a subset of errors, defaulting
the rest to die as usual. Separate the block that takes care of dying
into its own function so we have easy access to it.

Signed-off-by: Stefan Beller <sbeller@google.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

cache.h

@@ -507,6 +507,7 @@ extern int is_nonbare_repository_dir(struct strbuf *path);
 #define READ_GITFILE_ERR_NO_PATH 6
 #define READ_GITFILE_ERR_NOT_A_REPO 7
 #define READ_GITFILE_ERR_TOO_LARGE 8
+extern void read_gitfile_error_die(int error_code, const char *path, const char *dir);
 extern const char *read_gitfile_gently(const char *path, int *return_error_code);
 #define read_gitfile(path) read_gitfile_gently((path), NULL)
 extern const char *resolve_gitdir_gently(const char *suspect, int *return_error_code);

setup.c

@@ -486,6 +486,30 @@ int verify_repository_format(const struct repository_format *format,
 	return 0;
 }
 
+void read_gitfile_error_die(int error_code, const char *path, const char *dir)
+{
+	switch (error_code) {
+	case READ_GITFILE_ERR_STAT_FAILED:
+	case READ_GITFILE_ERR_NOT_A_FILE:
+		/* non-fatal; follow return path */
+		break;
+	case READ_GITFILE_ERR_OPEN_FAILED:
+		die_errno("Error opening '%s'", path);
+	case READ_GITFILE_ERR_TOO_LARGE:
+		die("Too large to be a .git file: '%s'", path);
+	case READ_GITFILE_ERR_READ_FAILED:
+		die("Error reading %s", path);
+	case READ_GITFILE_ERR_INVALID_FORMAT:
+		die("Invalid gitfile format: %s", path);
+	case READ_GITFILE_ERR_NO_PATH:
+		die("No path in gitfile: %s", path);
+	case READ_GITFILE_ERR_NOT_A_REPO:
+		die("Not a git repository: %s", dir);
+	default:
+		die("BUG: unknown error code");
+	}
+}
+
 /*
  * Try to read the location of the git directory from the .git file,
  * return path to git directory if found.
@@ -559,28 +583,8 @@ const char *read_gitfile_gently(const char *path, int *return_error_code)
 cleanup_return:
 	if (return_error_code)
 		*return_error_code = error_code;
-	else if (error_code) {
-		switch (error_code) {
-		case READ_GITFILE_ERR_STAT_FAILED:
-		case READ_GITFILE_ERR_NOT_A_FILE:
-			/* non-fatal; follow return path */
-			break;
-		case READ_GITFILE_ERR_OPEN_FAILED:
-			die_errno("Error opening '%s'", path);
-		case READ_GITFILE_ERR_TOO_LARGE:
-			die("Too large to be a .git file: '%s'", path);
-		case READ_GITFILE_ERR_READ_FAILED:
-			die("Error reading %s", path);
-		case READ_GITFILE_ERR_INVALID_FORMAT:
-			die("Invalid gitfile format: %s", path);
-		case READ_GITFILE_ERR_NO_PATH:
-			die("No path in gitfile: %s", path);
-		case READ_GITFILE_ERR_NOT_A_REPO:
-			die("Not a git repository: %s", dir);
-		default:
-			assert(0);
-		}
-	}
+	else if (error_code)
+		read_gitfile_error_die(error_code, path, dir);
 
 	free(buf);
 	return error_code ? NULL : path;