#!/bin/bash
#Copyright 2002 William Stearns
#Released under the GPL

CondMkdir () {
#Modified from the version in uml/functions
	while [ -n "$1" ]; do
		if [ -e "$1" ]; then
			if [ ! -d "$1" ]; then
				echo "$1" exists but is not a directory, not creating it.
				return 1
			else
				echo \("$1" exists\)
			fi
		else
			echo "Making $1" 
			$SUDO mkdir --parents "$1"
		fi
		shift
	done
}

renice +15 -p $$ >/dev/null 2>&1

SourceDir='/home/shared/uml/'

if [ -z "$1" ]; then
	echo Usage:
	echo $0 '[username] [distribution]'
	echo 'where distribution is rh73 (default), de30, or fc2'
	echo Exiting
	exit 1
fi

case "$1" in
.*|/*|*/|*/*|pub|shared)
	echo No username games, please, exiting.
	exit 1
	;;
esac

if [ ! -d "/home/$1" ]; then
	echo Please set up "$1" as a user first - \"adduser "$1"\", perhaps.  Exiting.
	exit 1
fi

#FIXME - check that a $1 user and $1 group entry exist.

if [ -n "$2" ]; then
	case "$2" in
	[Rr][Hh]73)
		Dist=rh73
		RootBase=root_fs.rh-7.3-full.pristine.20020905.zaphod
		;;
	[Dd][Ee]30)
		Dist=de30
		RootBase=Debian-3.0r0.ext3.zaphod
		;;
	[Ff][Cc]2)
		Dist=fc2
		RootBase=root_fs.fc-2-client.pristine.20040504
		;;
	*)
		echo Unknown distribution \""$2"\", exiting.
		exit 1
		;;
	esac

else
	Dist=rh73
	RootBase=root_fs.rh-7.3-full.pristine.20020905.zaphod
fi
echo Using distribution "$Dist", file "$RootBase"

#Because we're allowing people non-chrooted access to the host
#filesystem, but don't want people logging in to the actual host, we're
#locking down the host home directories so that they shouldn't be able
#to log in.
echo Locking down "/home/$1"
chmod 500 "/home/$1"
CondMkdir "/home/$1/.ssh" "/home/$1/.ssh2"
chmod 000 "/home/$1/.ssh" "/home/$1/.ssh2"

#Create /home/shared and /home/pub once
CondMkdir /home/pub /home/shared
chown root.root /home/pub /home/shared

#Give them a writeable directory in /home/pub and /home/shared, and make
#the top level directories for uml storage and uml backup
CondMkdir "/home/pub/$1" "/home/shared/$1" "/home/$1/.uml" "/home/$1/backup"
chown "$1.$1" "/home/pub/$1" "/home/shared/$1" "/home/$1/.uml" "/home/$1/backup"
chmod 755 "/home/pub/$1" "/home/shared/$1" "/home/$1/.uml" "/home/$1/backup"

if [ ! -e "/home/$1/.uml/$1" ]; then
	echo Creating linux binary
	ln -sf $SourceDir/linux "/home/$1/.uml/$1"
else
	echo \(linux binary already linked\)
fi

#The swap file is copied over fresh at every uml start - no need to copy it now.
#if [ ! -e "/home/$1/.uml/swap" ]; then
#	echo Copying swap
#	cp -p --sparse=always $SourceDir/swap.512.pristine "/home/$1/.uml/swap"
#	chown "$1.$1" "/home/$1/.uml/swap"
#	chmod 644 "/home/$1/.uml/swap"
#else
#	echo \(swap already exists\)
#fi


if [ ! -e "/home/$1/.uml/$RootBase" ]; then
	echo Linking $RootBase
	ln -f $SourceDir/$RootBase "/home/$1/.uml/$RootBase"
else
	echo \(pristine root filesystem already linked\)
fi

if [ ! -e "/home/$1/.uml/home" ]; then
	echo Copying home partition
	cp -p --sparse=always $SourceDir/home.8192.pristine "/home/$1/.uml/home"
	chown "$1.$1" "/home/$1/.uml/home"
	chmod 644 "/home/$1/.uml/home"
else
	echo \(home filesystem already exists\)
fi


if [ ! -e "/home/$1/.uml/params" ]; then
	echo Creating default params file
	echo "umid=$1-id mem=160M ubd0=/home/$1/.uml/root_fs.cow,/home/$1/.uml/$RootBase ubd1=/home/$1/.uml/swap ubd2=/home/$1/.uml/home eth0=daemon,FE:FD:42:3B:6F:BF con=pty con0=fd:0,fd:1" >"/home/$1/.uml/params"
else
	echo \(params already exists\)
fi