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代码： 全选

#!/bin/sh
workingdir=`uuidgen`
resultdir=`uuidgen`
mypath=$0
myname=`basename "$mypath"`

packagecheck(){
	dpkg -s squashfs-tools > /dev/null 2>&1 || { echo "squashfs-tools is required to run this program."; exit 1; }
}

rebuildtree(){
	mkdir /$workingdir
	mount --bind / /$workingdir
	mount --bind /boot /$workingdir/boot
	mount --bind /home /$workingdir/home
	mount --bind /tmp /$workingdir/tmp
	mount --bind /usr /$workingdir/usr
	mount --bind /var /$workingdir/var
	mount --bind /srv /$workingdir/srv
	mount --bind /opt /$workingdir/opt
	mount --bind /usr/local /$workingdir/usr/local
}

destroytree(){
	umount /$workingdir/usr/local
	umount /$workingdir/opt
	umount /$workingdir/srv
	umount /$workingdir/var
	umount /$workingdir/usr
	umount /$workingdir/tmp
	umount /$workingdir/home
	umount /$workingdir/boot
	umount /$workingdir
	rmdir /$workingdir
}

checkdir(){
	[ "${1#/}" = "$1" ] && { echo "You must specify the absolute path"; exit 1; }
	[ -d "$*" ] || { echo "$* does not exist, or is not a directory"; exit 1; }
}

dobackup(){
	packagecheck
	echo "You are about to backup your system. It is recommended that you quit all open applications now. Continue?(y/n)"
	read yn
	[ "$yn" != "y" ] && exit 1
	echo "Specify a directory(absolute path) to save the backup. If you don't specify, /$resultdir will be used"
	read backupdir
# 脱引号
	[ "${backupdir#'}" != "$backupdir" ] && [ "${backupdir%'}" != "$backupdir" ] && { backupdir="${backupdir#'}"; backupdir="${backupdir%'}"; }

	[ "$backupdir" != "" ] && { checkdir $backupdir; resultdir="${backupdir#/}"; }
	ls "/$resultdir/backup.squashfs" > /dev/null 2>&1 && { echo "Error: /$resultdir/backup.squashfs already exists"; exit 1; }
	mkdir -p "/$resultdir"
	rebuildtree
	mksquashfs /$workingdir "/$resultdir/backup.squashfs" -e "$myname" "$resultdir" "$workingdir" boot/grub etc/fstab lost+found boot/lost+found home/lost+found tmp/lost+found usr/lost+found var/lost+found srv/lost+found opt/lost+found usr/local/lost+found
	destroytree
	mksquashfs "$mypath" "/$resultdir/backup.squashfs"
	cp /boot/initrd.img-`uname -r` "/$resultdir/initrd.img"
	cp /boot/vmlinuz-`uname -r` "/$resultdir/vmlinuz"
	echo "Your backup is ready in /$resultdir :)"
}

dorestore(){
echo under construction
}

[ "$(whoami)" != root ] && { echo "Admin rights are required to run this program."; exit 1; }
[ "$*" = -b ] && { dobackup; exit 0; }
[ "$*" = -r ] && { dorestore; exit 0; }
echo "usage"
exit 1