Move FilePerm function from cli to headscale

cmd/headscale/cli/utils.go

@@ -29,7 +29,6 @@ import (
 )
 
 const (
-	PermissionFallback      = 0o700
 	HeadscaleDateTimeFormat = "2006-01-02 15:04:05"
 )
 
@@ -570,17 +569,6 @@ func (tokenAuth) RequireTransportSecurity() bool {
 	return true
 }
 
-func GetFileMode(key string) fs.FileMode {
-	modeStr := viper.GetString(key)
-
-	mode, err := strconv.ParseUint(modeStr, headscale.Base8, headscale.BitSize64)
-	if err != nil {
-		return PermissionFallback
-	}
-
-	return fs.FileMode(mode)
-}
-
 func contains[T string](ts []T, t T) bool {
 	for _, v := range ts {
 		if reflect.DeepEqual(v, t) {

utils.go

@@ -11,10 +11,12 @@ import (
 	"encoding/base64"
 	"encoding/json"
 	"fmt"
+	"io/fs"
 	"net"
 	"os"
 	"path/filepath"
 	"reflect"
+	"strconv"
 	"strings"
 
 	"github.com/rs/zerolog/log"
@@ -55,6 +57,8 @@ const (
 
 	// privateKey prefix.
 	privateHexPrefix = "privkey:"
+
+	PermissionFallback = 0o700
 )
 
 func MachinePublicKeyStripPrefix(machineKey key.MachinePublic) string {
@@ -350,3 +354,14 @@ func AbsolutePathFromConfigPath(path string) string {
 
 	return path
 }
+
+func GetFileMode(key string) fs.FileMode {
+	modeStr := viper.GetString(key)
+
+	mode, err := strconv.ParseUint(modeStr, Base8, BitSize64)
+	if err != nil {
+		return PermissionFallback
+	}
+
+	return fs.FileMode(mode)
+}