cmd/restic: Add locks to commands

cmd/restic/cmd_key.go

@@ -4,6 +4,7 @@ import (
 	"errors"
 	"fmt"
 
+	"github.com/restic/restic"
 	"github.com/restic/restic/backend"
 	"github.com/restic/restic/repository"
 )
@@ -121,6 +122,12 @@ func (cmd CmdKey) Execute(args []string) error {
 		return err
 	}
 
+	lock, err := restic.NewExclusiveLock(repo)
+	defer lock.Unlock()
+	if err != nil {
+		return err
+	}
+
 	switch args[0] {
 	case "list":
 		return cmd.listKeys(repo)