chore: replace os.(FileMode,PathError) by fs.(...) (#83)

flock.go

@@ -19,6 +19,7 @@ package flock
 
 import (
 	"context"
+	"io/fs"
 	"os"
 	"runtime"
 	"sync"
@@ -35,7 +36,7 @@ func SetFlag(flag int) Option {
 }
 
 // SetPermissions sets the OS permissions to set on the file.
-func SetPermissions(perm os.FileMode) Option {
+func SetPermissions(perm fs.FileMode) Option {
 	return func(f *Flock) {
 		f.perm = perm
 	}
@@ -53,7 +54,7 @@ type Flock struct {
 	// flag is the flag used to create/open the file.
 	flag int
 	// perm is the OS permissions to set on the file.
-	perm os.FileMode
+	perm fs.FileMode
 }
 
 // New returns a new instance of *Flock. The only parameter
@@ -72,7 +73,7 @@ func New(path string, opts ...Option) *Flock {
 	f := &Flock{
 		path: path,
 		flag: flags,
-		perm: os.FileMode(0o600),
+		perm: fs.FileMode(0o600),
 	}
 
 	for _, opt := range opts {

flock_unix_fcntl.go

@@ -22,7 +22,7 @@ package flock
 import (
 	"errors"
 	"io"
-	"os"
+	"io/fs"
 	"sync"
 	"syscall"
 
@@ -144,8 +144,7 @@ func (f *Flock) doLock(cmd cmdType, lt lockType, blocking bool) (bool, error) {
 
 	if i, dup := inodes[f]; dup && i != ino {
 		mu.Unlock()
-
-		return false, &os.PathError{
+		return false, &fs.PathError{
 			Op:   lt.String(),
 			Path: f.Path(),
 			Err:  errors.New("inode for file changed since last Lock or RLock"),