Andreas Linz klingtnet

How to fix a bad swapfile

I recently saw a bunch of those warnings when booting Arch Linux:

$ systemctl status swapfile.swap | grep -i invalid
Jun 12 12:34:25 m604 swapon[22623]: swapon: /swapfile: swapon failed: Invalid argument

This was weird since the swapfile worked fine before and the file existed and had secure permissions:

The following commands assume that Arch Linux is installed, they should be applicable to any systemd based distro whatsoever.

# install ddccontrol or gddccontrol if you wish a GUI
$ pacman -S ddccontrol
# insert the required kernel module
$ modprobe i2c-dev
# make sure that the i2c-dev kernel module is inserted automatically on boot
$ cat <<HEREDOC> /etc/modules-load.d/i2c-dev.conf 
# Load i2c-dev module for ddccontrol

	package main

	import (
	"fmt"
	"log"
	"os"
	"strings"

	"gopkg.in/yaml.v2"
	)

	package main

	import (
	"errors"
	"fmt"
	"io"
	"io/ioutil"
	"os"
	"time"
	)

	#!/bin/bash

	set -euo pipefail

	_cmd=${1:-'help'}

	case $_cmd in
	"on")
	dconf write /org/gnome/settings-daemon/plugins/power/sleep-inactive-ac-type "'nothing'"
	;;

	package main

	import (
	"bytes"
	"io"
	"log"
	"net/http"

	"github.com/gabriel-vasile/mimetype"
	)

	package main

	import (
	"bufio"
	"context"
	"fmt"
	"io"
	"os"
	"os/exec"

	#!/bin/bash

	set -eu

	IFS=\n && parallel ffmpeg -i {} -c:a libopus -b:a 128k {.}.opus' ::: */.flac

	#!/bin/sh

	set -euo pipefail

	command -v reflex &>/dev/null \|\| { cat <<HEREDOC
	Please install reflex:
	go get -u github.com/cespare/reflex
	HEREDOC
	exit 1
	}

	package main

	import (
	"fmt"
	"regexp"
	)

	func capturingGroups(re *regexp.Regexp, input string) map[string]string {
	groups := make(map[string]string)
	matches := re.FindStringSubmatch(input)