// Copyright © 2019 Banzai Cloud
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
//     http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.

package linux

import (
	"io"

	"github.com/banzaicloud/pke/cmd/pke/app/util/runner"
)

const (
	swapoff = "/sbin/swapoff"
	sed     = "/bin/sed"
	fstab   = "/etc/fstab"
)

// SwapOff disables Linux swap.
func SwapOff(out io.Writer) error {
	// swapoff -a
	if err := runner.Cmd(out, swapoff, "-a").Run(); err != nil {
		return err
	}

	// sed -i '/swap/s/^/#/' /etc/fstab
	return runner.Cmd(out, sed, "-i", "/swap/s/^/#/", fstab).Run()
}
