Merge pull request #17 from sk91/file-permissions

feat: add an option to configure lock file permissions

filemutex_flock.go

@@ -2,14 +2,19 @@
 // Use of this source code is governed by a BSD-style
 // license that can be found in the LICENSE file.
 
+//go:build darwin || dragonfly || freebsd || linux || netbsd || openbsd || solaris
 // +build darwin dragonfly freebsd linux netbsd openbsd solaris
 
 package filemutex
 
-import "golang.org/x/sys/unix"
+import (
+	"os"
+
+	"golang.org/x/sys/unix"
+)
 
 const (
-	mkdirPerm = 0750
+	mkdirPerm os.FileMode = 0750
 )
 
 // FileMutex is similar to sync.RWMutex, but also synchronizes across processes.
@@ -19,7 +24,15 @@ type FileMutex struct {
 }
 
 func New(filename string) (*FileMutex, error) {
-	fd, err := unix.Open(filename, unix.O_CREAT|unix.O_RDONLY, mkdirPerm)
+	return new(filename, mkdirPerm)
+}
+
+func NewWithMode(filename string, perm os.FileMode) (*FileMutex, error) {
+	return new(filename, perm)
+}
+
+func new(filename string, perm os.FileMode) (*FileMutex, error) {
+	fd, err := unix.Open(filename, unix.O_CREAT|unix.O_RDONLY, uint32(perm))
 	if err != nil {
 		return nil, err
 	}