old-www/LDP/LG/issue72/misc/tips/backpack.bash.txt

#!/bin/bash

dev=floppy
dir=~/.backpack
name=`hostname -s`

# Anything outside of the standard syntax (i.e., two characters) resets the
# parameters to NULL, which will invoke "-h".
[ ${#1} -gt 2 ] && { set --; }

# Note that this is not a "while" loop: "getopts" only sees one option.
getopts "achu" opt

case $opt
in
	c)	[ ! -d $dir ] && { mkdir $dir; >$dir/permlist; >$dir/templist; }

	clear
	cat <<- !
	The format of these file lists is one file or directory per line,
	like this:

	/home/joe/netscape/bookmarks.html
	/var/mail
	/usr/share/dict/words

	The files in the permanent list will be archived every time; the
	temporary list will be cleared between runs.

	Would you like to edit the permanent file list? [yN]
	!

	read choice
	[ "$choice" == "y" ] && {
		cp $dir/permlist $dir/permlist.tmp
		$EDITOR $dir/permlist.tmp
		err=""
		for f in `cat $dir/permlist.tmp`
		do
			[ -e $f ] || err=$f
		done
		clear

		[ "$err" != "" ] && {
			rm $dir/permlist.tmp
			echo "ERROR: $err does not exist; the permanent list was NOT updated."
			echo
			exit
		} || {
			mv $dir/permlist.tmp $dir/permlist
			echo
			echo "The permanent file list has been updated."
			echo
		}
	}

	echo "Would you like to edit the temporary file list? [yN]"
	read choice
	[ "$choice" == "y" ] && {
		cp $dir/templist $dir/templist.tmp
		$EDITOR $dir/templist.tmp
		err=""
		for f in `cat $dir/templist.tmp`
		do
		[ -e $f ] || err=$f
		done
		clear

		[ "$err" != "" ] && {
			rm $dir/templist.tmp
			echo
			echo "ERROR: $err does not exist; the temporary list was NOT updated."
			echo
			exit
		} || {
			mv $dir/templist.tmp $dir/templist
			echo
			echo "The temporary file list has been updated."
			echo
		}
	}
	;;

	a)	[ -f "$dir/permlist" -a -f "$dir/templist" ] || {
		echo "You must first create the file lists."
		exit
	}

	# Read both file lists and create the archive
	tar -cvzf $dir/bp$name.tgz `cat $dir/permlist $dir/templist`
	[ $? -gt 0 ] && { echo 'Error in archive creation! Aborting.'; exit; }

	# Add up the file sizes
	size=$(ls -l $dir/permlist $dir/templist $dir/bp$name.tgz $0 |awk '{ t+=$5 } END { print t }')
	[ $size -gt "1474560" ] && {
	cat <<- !

	Warning: The archive you created is $size bytes long; that's bigger
	than the standard (1.44MB) floppy. Make sure it'll fit on your disk.

	Press 'Enter' to continue or 'Ctrl-C' to abort.

	!
	read
	}

	while [ $dev == ${dev%/*} ]
	do
		cat <<- !

		Please enter the complete path to the directory where
		the floppy will be mounted, like

		/mnt/floppy

		NOTE: Make sure your floppy has enough space for all the files;
		a formatted blank disk is best of all.

		!
		read dev
	done

	[ `mount|grep -c $dev` -eq 0 ] && mount $dev

	[ $? -eq 0 ] || { echo 'OOPS! Mount problem!'; exit; }

	rm -f $dev/bp*tgz
	cp $0 $dir/bp$name.tgz $dir/permlist $dir/templist $dev

	[ $? -eq 0 ] && {
	echo -e "\nYour BackPack floppy has been created in $dev.\n"
	> $dir/templist
	} || {
		cat <<- !

		ERROR: BackPack ran into a problem; something failed
		while copying the archive to $dev. Possible causes
		might be things like a full or a damaged floppy. Please
		correct whatever is wrong and try again.

		!
	}

	sync
	umount $dev
	;;

	u)  [ -d $dir ] || mkdir $dir

	while [ $dev == ${dev%/*} ]
	do
		cat <<- !

		Please enter the complete path to the directory where
		the BackPack floppy is mounted, i.e.

		/mnt/floppy

		!
		read dev
	done

	[ `mount|grep -c $dev` -eq 0 ] && mount $dev

	[ $? -eq 0 ] || { echo 'OOPS! Mount problem!'; exit; }

	echo "Creating a backup archive of the local files in $dir/bp$name.old.tgz..."
	tar cz --ignore-failed-read -f $dir/bp$name.old.tgz `cat $dev/permlist $dev/templist` > /dev/null 2>&1
	echo "Replacing local files with BackPack versions..."
	tar xz -C / -f $dev/bp*tgz

	sync
	umount $dev
	;;

	h|*)  cat <<- !

	*BackPack* by Ben Okopnik 6/2001

	backpack -[cauh]

		-c	Create or edit the file list[s]
		-a	Archive the files in the selection list[s]
		-u	Unpack the archive (interactive prompts)
		-h	Help - display this usage message

	!
	;;
esac