Add DVD backup script

.gitignore

@@ -29,11 +29,13 @@ zsh-syntax-highlighting
 *.idx
 *.iso
 *.jar
+*.log
 *.mec
 *.mcd
 *.mcr
 *.nvm
 *.ps2
+*.sha256
 *.tar
 *.tar.gz
 *.tgz

backup/backup_dvd.sh

@@ -0,0 +1,28 @@
+#!/usr/bin/env bash
+set -e
+
+if [ "${EUID}" -eq 0 ]; then
+  echo "This script should not be run as root."
+  exit 1
+fi
+
+if [ $# -eq 1 ]; then
+  DEVICE="/dev/sr0"
+elif [ $# -eq 2 ]; then
+  DEVICE=$1
+else
+  echo "Invalid number of arguments."
+  exit 1
+fi
+FILENAME=$1
+
+if [ $(command -v ddrescue &> /dev/null) -or $(command -v 7zr &> /dev/null) ]; then :; else
+  echo "The necessary packages appear not to be installed. Installing."
+  sudo apt-get update
+  sudo apt-get install gddrescue p7zip
+fi
+
+ddrescue -b 2048 -n -v "${DEVICE}" "${FILENAME}.iso" rescue.log
+mv rescue.log "${FILENAME}-rescue.log"
+sha256sum "${FILENAME}.iso" > "${FILENAME}.iso.sha256"
+7zr a -mx=9 "${FILENAME}.7z" "${FILENAME}.iso" "${FILENAME}.iso.sha256"