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#!/bin/bash

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### Initialize 

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set -u

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set -e

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TESTING=

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DO_SHOWSPEC=y

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DO_VIRTINSTALL=

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scripts=$(dirname $0)/scripts

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. $scripts/lib.sh

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### Command-line input

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## Command-line options

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function _help () {

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    cat <<END

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Usage: $1 [options] <name> [param=value [...]]

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Options:

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    -h      Show this help text

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    -D      Debug

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    -v      Verbose

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    -q      Quiet

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    -N      Mock command execution

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    -P      Skip command prompts

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    -I      Do a virt-install

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    -T      Just testing..

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Parameters are given as:

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    NAME=value-{FOO}

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END

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}

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while getopts "hDvqNPTI" opt; do

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    case "$opt" in

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        h)

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            _help $0

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            exit 0

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            ;;

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        D)

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            LOG_DEBUG=y

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            LOG_CMD=y

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            ;;

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        v)

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            LOG_CMD=y

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            log_debug "log: Commands"

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            ;;

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        q)

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            LOG_CMD=

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            LOG_INFO=

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            DO_SHOWSPEC=

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            log_debug "log: Quiet"

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            ;;

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        N)

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            log_info "Mock-executing commands (this will break functionality..)"

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            CMD_MOCK=y

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            ;;

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        P)

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            log_info "Skipping command confirmations"

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            CMD_PROMPT=

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            ;;

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        T)

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            log_info "Just testing.."

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            TESTING=y

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            ;;

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        I)

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            log_info "Do virt-install"

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            DO_VIRTINSTALL=y

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            ;;

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        ?)

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            _help $0

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            exit 1

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            ;;

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    esac

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done

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# forget them

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[ $OPTIND -gt 1 ] && shift $(( $OPTIND - 1 ))

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## Command-line arguments

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# Name

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[ -z $1 ] && die "Machine name must be given as first argument"

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opt_name="$1"; shift

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# Defaults

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function define_opt () {

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    local name=$1

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    local value=${2:-}

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    log_debugf "%-20s = %s" $name "$value"

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    eval "opt_${name}=${value}"

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}

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function resolve_name () {

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    local name=$1

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    local out=$(dig +short $name)

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    [ -z "$out" ] && die "Hostname lookup failed: $name"

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    echo $out

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}

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define_opt  ram         1G

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define_opt  cpus        2

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define_opt  os          debiansqueeze

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define_opt  disk_size   10G

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define_opt  disk_vg     pvl

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define_opt  disk_lv     $opt_name

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define_opt  disk_bus    virtio

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define_opt  guest_disk  /dev/vda

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define_opt  hostname    $opt_name

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define_opt  bridge      br-lan

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define_opt  dns_domain  paivola.fi

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define_opt  ip          

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log_info "Processing ${#@} parameters:"

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for param in "$@"; do

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    name=${param%=*}

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    value=${param##*=}

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    # evaluate

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    value=$(expand_line "$value")

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    define_opt ${name} "${value}"

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done

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# resolve defaults

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if [ -z $opt_ip ]; then

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    define_opt  ip          $(resolve_name ${opt_name}.${opt_dns_domain})

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fi

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## Guest info

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GUEST_NAME=$opt_name

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# Basic params

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GUEST_RAM=$opt_ram

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GUEST_VCPUS=$opt_cpus

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# OS variant (for virt-install)

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GUEST_OS_VARIANT=$opt_os

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## Disk

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# Size of LV to create

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DISK_SIZE=$opt_disk_size

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# LVM vg to use

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DISK_VG=$opt_disk_vg

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# LVM lv to use

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DISK_NAME=$opt_disk_lv

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# Path to disk block device

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DISK_PATH=/dev/mapper/${DISK_VG}-${DISK_NAME}

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DISK_BUS=$opt_disk_bus

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GUEST_DISK=$opt_guest_disk

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## Network

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NET_HOSTNAME=$opt_hostname

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NET_BRIDGE=$opt_bridge

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NET_IPADDR=$opt_ip

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## Installation image

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# Original Debian Installer image (iso)

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INSTALLER_NAME="debian-6.0.3-amd64"

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INSTALLER_ISO="iso-in/${INSTALLER_NAME}-netinst.iso"

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INSTALLER_TREE="iso-in/$INSTALLER_NAME"

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INSTALLER_FLAG="${INSTALLER_TREE}.unpacked"

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# Customized preseed image name

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INSTALL_NAME="debian-6.0.3-amd64_${GUEST_NAME}"

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# Customized image content

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INSTALL_TREE="images/${INSTALL_NAME}"

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INSTALL_ISO="iso-out/${INSTALL_NAME}.iso"

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# Preseed output file in install tree

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# Preseed source template

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PRESEED_TEMPLATE="preseed/${PRESEED_NAME}"

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PRESEED_FILE="${INSTALL_TREE}/${PRESEED_NAME}"

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PRESEED_ISOLINUX="preseed/isolinux.cfg"

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PRESEED_INCLUDES=("preseed/passwords.cfg" "preseed/host.cfg")

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PRESEED_CHECKSUM= # set later

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# installer boot args

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INSTALL_BOOT_ARGS="auto=true priority=critical preseed/file=/cdrom/${PRESEED_NAME} preseed/file/checksum=${PRESEED_CHECKSUM} -- quiet console=ttyS0"

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GENISOIMAGE=/usr/bin/genisoimage

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GENISOIMAGE_OPTS="-r -J -no-emul-boot -boot-load-size 4 -boot-info-table -b isolinux/isolinux.bin -c isolinux/boot.cat"

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LVM=/sbin/lvm

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LIBVIRT=qemu:///system

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VIRSH=/usr/bin/virsh

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function virsh () {

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    $VIRSH --connect $LIBVIRT "$@"

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}

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# type of guest to create

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LIBVIRT_TYPE=kvm

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VIRT_INSTALL="/usr/bin/virt-install"

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## SELinux?

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#SEMANAGE=/usr/sbin/semanage

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#RESTORECON=/sbin/restorecon

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### Prepare

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if [ $DO_SHOWSPEC ]; then

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    cat <<END

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Guest:

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    Name:       $GUEST_NAME

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    CPUs:       $GUEST_VCPUS

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    RAM:        $GUEST_RAM

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    OS:         $GUEST_OS_VARIANT

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    Disk:       $GUEST_DISK

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Disk:

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    Method:     LVM

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    Size:       $DISK_SIZE

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    LVM:

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        VG:     $DISK_VG

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        LV:     $DISK_NAME

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    Path:       $DISK_PATH

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    Bus:        $DISK_BUS

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Net:

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    Hostname:   $NET_HOSTNAME

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    Method:     Bridge

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    IP:         $NET_IPADDR

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    Bridge:

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        Name:   $NET_BRIDGE

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Installer:

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    Name:       $INSTALLER_NAME

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    ISO:        $INSTALLER_ISO

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    Tree:       $INSTALLER_TREE

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Install:

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    Name:       $INSTALL_NAME

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    Tree:       $INSTALL_TREE

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    ISO:        $INSTALL_ISO

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Preseed:

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    Name:       $PRESEED_NAME

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    Template:   $PRESEED_TEMPLATE

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    Target:     $PRESEED_FILE

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    Isolinux:   $PRESEED_ISOLINUX

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    Includes:   $PRESEED_INCLUDES

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END

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fi

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[ $TESTING ] && exit 0

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### Check

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# Parameters given?

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[ -z $NET_IPADDR ] && die "net: No IP-address given: ip"

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# Installer exists?

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if cmd test ! -f ${INSTALLER_ISO}; then

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    die "Installer not found: ${INSTALLER_ISO}"

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fi

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### Prepare install

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## Extract .iso

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if [ -f ${INSTALLER_FLAG} ]; then

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    log_info "Installer already unpacked: ${INSTALLER_TREE}"

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else

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    log_info "Unpacking installer: ${INSTALLER_ISO}"

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    cmd extract_iso ${INSTALLER_ISO} ${INSTALLER_TREE}

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    cmd touch ${INSTALLER_FLAG}

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fi

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# Copy to customized tree

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[ -d ${INSTALL_TREE} ] && cmd rm -r ${INSTALL_TREE}

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cmd cp -rd ${INSTALLER_TREE} ${INSTALL_TREE}

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cmd chmod -R u=rwX,og=rX ${INSTALL_TREE}

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log_info "Installer extracted: $INSTALL_TREE"

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## Customize preseed

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cmd expand_template ${PRESEED_TEMPLATE} ${PRESEED_FILE}

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# md5sum

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PRESEED_CHECKSUM=$(my_md5sum $PRESEED_FILE)

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# Isolinux .cfg

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cmd expand_template ${PRESEED_ISOLINUX} ${INSTALL_TREE}/isolinux/isolinux.cfg

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# Others

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for file in ${PRESEED_INCLUDES[@]}; do

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    name=$(basename $file)

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    cmd expand_template $file ${INSTALL_TREE}/${name}

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done

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log_info "Preseed generated: $PRESEED_FILE"

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## Create .iso

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[ -f ${INSTALL_ISO} ] && cmd rm -f ${INSTALL_ISO}

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# generates a lot of output

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cmd ${GENISOIMAGE} -o ${INSTALL_ISO} -quiet ${GENISOIMAGE_OPTS} ${INSTALL_TREE} 

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log_info "Install ISO generated: $INSTALL_ISO"

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### Create virtual machine

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if [ $DO_VIRTINSTALL ]; then

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    ## Disk

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    # Create LV (unless it already exists)

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    [ -e $DISK_PATH ] || cmd_confirm sudo $LVM lvcreate -L $DISK_SIZE -n $DISK_NAME $DISK_VG

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    ## SELinux?

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    #$SEMANAGE fcontext -a -t virt_image_t $DISK

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    #$RESTORECON -v $DISK

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    ## virt-install

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    cmd_confirm $VIRT_INSTALL \

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            --connect $LIBVIRT \

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            --name $GUEST_NAME \

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            --ram $(expand_MB $GUEST_RAM) --vcpus $GUEST_VCPUS \

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            --cdrom "$INSTALL_ISO" \

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            --os-variant $GUEST_OS_VARIANT \

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            --disk path=$DISK_PATH,bus=$DISK_BUS \

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            --network bridge:$NET_BRIDGE \

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            --vnc \

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            --virt-type $LIBVIRT_TYPE \

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            --accelerate --hvm \

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            --serial pty

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fi

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