#!/bin/bash
# runuml <umlno> <username>
# Note that we use `"$@"' to let each command-line parameter expand to a 
# separate word. The quotes around `$@' are essential!
# We need TEMP as the `eval set --' would nuke the return value of getopt.
NOCOW=""
NOJAIL=""
LINUX="linux"

TEMP=`getopt -o mf --long maintainance,nocow,nojail,free,skas -- "$@"`

if [ $? != 0 ] ; then echo "Terminating..." >&2 ; exit 1 ; fi

# Note the quotes around `$TEMP': they are essential!
eval set -- "$TEMP"

while true ; do
	case "$1" in
		-m|--nocow|--maintainance) NOCOW="true"; shift ;;
		-f|--nojail|--free) NOJAIL="true"; shift ;;
		--skas) LINUX="linux-skas"; shift ;;
		--) shift ; break ;;
		*) echo "Internal error!" ; exit 1 ;;
	esac
done

UML_PORT=${1}
UML_USER=${2}
UML_RAM=${3}

UML_BIN=/opt/uml/bin
UML_DISK=/var/uml/${UML_PORT}

UML_LINUX=${UML_BIN}/${LINUX}

UBD0COW="${UML_DISK}/root_fs.cow,"
UBD1COW=""
UBD2COW="${UML_DISK}/home_fs.cow,"
UBD3COW=""
UBD4COW=""
UBD0FS="${UML_DISK}/root_fs"
UBD1FS="${UML_DISK}/var_fs"
UBD2FS="${UML_DISK}/home_fs"
UBD3FS="${UML_DISK}/tmp_fs"
UBD4FS="${UML_DISK}/swap"

let "TAP0=${UML_PORT}*2"
let "TAP1=${TAP0}+1"
ETH0="eth0=tuntap,tap${TAP0}"
ETH1="eth1=tuntap,tap${TAP1}"
MEM="mem=${UML_RAM}"
OPTS="jail fakehd fake_ide"

if [ "m$NOCOW" != "m" ]
then

	rm ${UML_DISK}/*.cow

	UBD0COW=""
	UBD1COW=""
	UBD2COW=""
	UBD3COW=""
	UBD4COW=""

	chown ${UML_USER}.${UML_USER} ${UBD0FS} ${UBD2FS}
	chmod 666   ${UBD0FS} ${UBD2FS}

	NOJAIL="true"
fi

if [ "m$NOJAIL" != "m" ]
then
        OPTS=""
fi

OPTS="${OPTS} con0=fd:0,fd:1 con=pts umid=${UML_USER} uml_dir=${UML_DISK}/tmp"
UBD0="ubd0=${UBD0COW}${UBD0FS}"
UBD1="ubd1=${UBD1COW}${UBD1FS}"
UBD2="ubd2=${UBD2COW}${UBD2FS}"
UBD3="ubd3=${UBD3COW}${UBD3FS}"
UBD4="ubd4=${UBD4COW}${UBD4FS}"

echo "cd ${UML_DISK}/tmp;${UML_LINUX} ${OPTS} ${MEM} ${UBD0} ${UBD1} ${UBD2} ${UBD3} ${UBD4} ${ETH0} ${ETH1}"

screen -S uml-${UML_USER} -d -m \
  su - ${UML_USER} -c \
  "cd ${UML_DISK}/tmp;${UML_LINUX} ${OPTS} ${MEM} ${UBD0} ${UBD1} ${UBD2} ${UBD3} ${UBD4} ${ETH0} ${ETH1};chmod 444 ${UBD0FS} ${UBD2FS};chown root.root ${UBD0FS} ${UBD2FS}"