Arch AIF- Install with pre-determined partitions

#!/bin/bash

SOURCE=net
MIRROR=('http://mirrors.xmission.com/archlinux/${repo}/os/${arch}' 'http://locke.suu.edu/linux/dist/archlinux/${repo}/os/${arch}')
SYNC_URL=${MIRROR}
TARGET_REPOSITORIES=(core ${SYNC_URL} extra ${SYNC_URL} community ${SYNC_URL})

HARDWARECLOCK=UTC
TIMEZONE=MST
KEYMAP=dvorak
RUNTIME_REPOSITORIES=
RUNTIME_PACKAGES=

systemd='systemd systemd-arch-units systemd-sysvcompat'
xorg='xorg-server xorg-xinit xorg-server-utils'
python='python python2 pygtk'
sysv='initscripts sysvinit'
# add this in if you want to run in a vm
virtualbox='virtualbox-archlinux-additions'

# packages to install
TARGET_GROUPS='base gnome'
TARGET_PACKAGES_EXCLUDE="nano reiserfsprogs epiphany ${sysv}"
TARGET_PACKAGES="${systemd} ${xorg} ${python} gdm vim networkmanager iproute2 sudo"

grok_partitions () {
    local root_found=
    local partitions=
    for label in `ls /dev/disk/by-label | grep "Arch"`
    do
        if [ ${label} == "Arch" ]
        then
            mount_point="/"
            root_found=true
        else
            IFS="-" read base mount <<< "${label}"
            mount_point="/${mount}"
        fi

        local partition=$(readlink -f /dev/disk/by-label/${label})
        local fs=$(blkid -s TYPE -o value "${partition}")
        partitions+="${partition} raw ${label} ${fs};yes;${mount_point};target;no_opts;${label};no_params\n"
    done

    if [ ! ${root_found} ]
    then
        echo "No mount point specified for /. Refusing to continue."
        exit 1
    fi

    # do the swap
    if [ -e /dev/disk/by-label/swap ]
    then
        local partition=$(readlink -f /dev/disk/by-label/swap)
        partitions+="${partition} raw swap swap;yes;no_mountpoint;target;no_opts;swap;no_params"
    else
        # if there's no labeled swap, use the first one we find
        local partition=$(blkid -t TYPE="swap" -o device | head -1)
        if [ ! -e ${partition} ]
        then
            echo "No swap detected. Giving up."
            exit 1
        fi
        partitions+="${partition} raw no_label swap;yes;no_mountpoint;target;no_opts;no_label;no_params"
    fi

    echo -n ${partitions}
}

PART_ACCESS=

# These variables are mandatory

GRUB_DEVICE=/dev/sda

# empty partition table (we've already set them up)
# there has to be something here or aif will complain
PARTITIONS="invalid"

BLOCKDATA=$(grok_partitions)
# you can optionally also override some functions...
# This way you can change/extend/remove pretty much all functionality in AIF !

worker_intro () {
    inform "The following partition setup will be used:"
    echo -e ${BLOCKDATA}
    inform "This is your last chance to abort. Install starting in 3 seconds."
    sleep 3
}

# don't partition, we already have our disks set up
# this is basically the same as prepare_disks, but
# it does not create the partitions
worker_prepare_disks () {
    if ! process_filesystems
    then
        show_warning 'Disk processing' "Could not process_filesystems"
        txt='also failed to execute properly'
        rollback_filesystems && txt='ended successfully'
        die_error "Something failed while processing the filesystem. A rollback was executed, which $txt"
    fi
}

worker_configure_system () {
    preconfigure_target

    # store systemd-specific settings
    echo "archy" > "${var_TARGET_DIR}/etc/hostname"
    echo "KEYMAP=dvorak" > "${var_TARGET_DIR}/etc/vconsole.conf"
    echo "America/Boise" > "${var_TARGET_DIR}/etc/timezone"

    postconfigure_target
}