chore: initialize Gitea v1.27.2 fork

Includes direct password setup links in registration emails.

Assisted-by: Codex:GPT-5

modules/util/file_unix.go

@@ -0,0 +1,27 @@
+// Copyright 2022 The Gitea Authors. All rights reserved.
+// SPDX-License-Identifier: MIT
+
+//go:build !windows
+
+package util
+
+import (
+	"os"
+
+	"golang.org/x/sys/unix"
+)
+
+var defaultUmask int
+
+func init() {
+	// at the moment, the umask could only be gotten by calling unix.Umask(newUmask)
+	// use 0o077 as temp new umask to reduce the risks if this umask is used anywhere else before the correct umask is recovered
+	tempUmask := 0o077
+	defaultUmask = unix.Umask(tempUmask)
+	unix.Umask(defaultUmask)
+}
+
+func ApplyUmask(f string, newMode os.FileMode) error {
+	mod := newMode & ^os.FileMode(defaultUmask)
+	return os.Chmod(f, mod)
+}