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get_os_type() {
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    target=$1
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    if [ -z "${target}" ] ; then
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        log_error "target is not set in get_os_type"
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        exit 1
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    fi
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    if [ -e ${target}/etc/redhat-release ] ; then
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        OS_TYPE="redhat"
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    elif [ -e ${target}/etc/debian_version ] ; then
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        OS_TYPE="debian"
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    elif [ -e ${target}/etc/gentoo-release ] ; then
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        OS_TYPE="gentoo"
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    elif [ -e ${target}/etc/SuSE-release ] ; then
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        OS_TYPE="suse"
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    fi
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}
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get_os() {
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    target=$1
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    if [ -z "${target}" ] ; then
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        log_error "target is not set in get_os"
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        exit 1
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    fi
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    lsb="/usr/bin/lsb_release"
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    if [ -e ${target}/$lsb ] ; then
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        OPERATING_SYSTEM="$(chroot ${target} ${lsb} -i -s | tr "[:upper:]" "[:lower:]")"
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    elif [ -e ${target}/etc/debian_version ] ; then
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        OPERATING_SYSTEM="debian"
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    elif [ -e ${target}/etc/gentoo-release ] ; then
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        OPERATING_SYSTEM="gentoo"
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    elif [ -e ${target}/etc/fedora-release ] ; then
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        OPERATING_SYSTEM="fedora"
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    elif [ -e ${target}/etc/redhat-release ] ; then
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        if [ -n "$(grep -i centos ${target}/etc/redhat-release)" ] ; then
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            OPERATING_SYSTEM="centos"
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        else
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            OPERATING_SYSTEM="redhat"
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        fi
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    fi
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}
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get_os_release() {
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    target=$1
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    if [ -z "${target}" ] ; then
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        log_error "target is not set in get_os_release"
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        exit 1
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    fi
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    lsb="/usr/bin/lsb_release"
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    if [ -e ${target}/$lsb ] ; then
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        OS_RELEASE="$(chroot ${target} ${lsb} -r -s | tr "[:upper:]" "[:lower:]")"
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    elif [ -e ${target}/etc/debian_version ] ; then
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        OS_RELEASE="$(cat ${target}/etc/debian_version)"
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    elif [ -e ${target}/etc/fedora-release ] ; then
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        OS_RELEASE="$(cat ${target}/etc/fedora-release | awk '{print $3}')"
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    elif [ -e ${$target}/etc/redhat-release ] ; then
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        OS_RELEASE="$(cat ${target}/etc/redhat-release | awk '{print $3}')"
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    fi
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}
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format_disk0() {
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    local sfdisk_cmd="$SFDISK -uM -H 255 -S 63 --quiet --Linux --DOS $1"
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    if [  "${SWAP}" = "yes" -a -z "${KERNEL_PATH}" ] ; then
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        # Create three partitions:
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        # 1 - 100MB /boot, bootable
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        # 2 - Size of Memory, swap
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        # 3 - Rest
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        $sfdisk_cmd > /dev/null <<EOF
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,100,L,*
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,${SWAP_SIZE},S
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,,L
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EOF
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    elif [  "${SWAP}" = "no" -a -z "${KERNEL_PATH}" ] ; then
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        # Create two partitions:
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        # 1 - 100MB /boot, bootable
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        # 2 - Rest
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        $sfdisk_cmd > /dev/null <<EOF
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,100,L,*
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,,L
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EOF
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    elif [  "${SWAP}" = "yes" -a -n "${KERNEL_PATH}" ] ; then
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        # Create two partitions:
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        # 1 - Size of Memory, swap
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        # 2 - Rest
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        $sfdisk_cmd > /dev/null <<EOF
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,$SWAP_SIZE,S
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,,L
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EOF
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    elif [  "${SWAP}" = "no" -a -n "${KERNEL_PATH}" ] ; then
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        # Create two partitions:
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        # 1 - Whole
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        $sfdisk_cmd > /dev/null <<EOF
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,,L
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EOF
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    fi
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}
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mkfs_disk0() {
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    local mkfs="mkfs.${FILESYSTEM}"
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    # Format /
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    $mkfs -Fq -L / $root_dev > /dev/null
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    # Format /boot
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    if [ -n "${boot_dev}" ] ; then
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        $mkfs -Fq -L /boot $boot_dev > /dev/null
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    fi
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    # Format swap
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    if [ -n "${swap_dev}" ] ; then
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        # Format swap
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        mkswap -f $swap_dev > /dev/null
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    fi
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    # During reinstalls, ext4 needs a little time after a mkfs so add it here
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    # and also run a sync to be sure.
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    sync
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    sleep 2
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}
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setup_fstab() {
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    local target=$1 fs=${FILESYSTEM}
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    get_os_type $target
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    cat > $target/etc/fstab <<EOF
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# /etc/fstab: static file system information.
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#
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# <file system>   <mount point>   <type>  <options>       <dump>  <pass>
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UUID=$root_uuid   /               $fs     defaults        0       1
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proc              /proc           proc    defaults        0       0
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EOF
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if [ -n "$boot_dev" -a -n "$boot_uuid" ] ; then
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    cat >> $target/etc/fstab <<EOF
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UUID=$boot_uuid   /boot           $fs     defaults        1       2
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EOF
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fi
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if [ -n "$swap_dev" -a -n "$swap_uuid" ] ; then
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    cat >> $target/etc/fstab <<EOF
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UUID=$swap_uuid   swap            swap    defaults        0       0
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EOF
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fi
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# OS Specific fstabs
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if [ "$OS_TYPE" = "redhat" ] ; then
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    cat >> $target/etc/fstab <<EOF
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tmpfs             /dev/shm        tmpfs   defaults        0       0
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devpts            /dev/pts        devpts  gid=5,mode=620  0       0
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sysfs             /sys            sysfs   defaults        0       0
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EOF
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fi
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if [ "$OS_TYPE" = "gentoo" ] ; then
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    cat >> $target/etc/fstab <<EOF
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shm               /dev/shm        tmpfs   nodev,nosuid,noexec 0   0
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EOF
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fi
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}
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setup_console() {
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    local target=$1
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    if [ -z "$target" ] ; then
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        log_error "target not set for setup_console"
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        exit 1
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    fi
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    # Upstart is on this system, so do this instead
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    if [ -e ${target}/etc/event.d/tty1 ] ; then
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        cat ${target}/etc/event.d/tty1 | sed -re 's/tty1/ttyS0/' \
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            > ${target}/etc/event.d/ttyS0
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        return
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    fi
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    # upstart in karmic and newer
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    if [ -e ${target}/etc/init/tty1.conf ] ; then
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        cat ${target}/etc/init/tty1.conf | \
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        sed -re 's/^exec.*/exec \/sbin\/getty -L 115200 ttyS0 vt102/' \
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            > ${target}/etc/init/ttyS0.conf
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        sed -ie 's/tty1/ttyS0/g' ${target}/etc/init/ttyS0.conf
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        return
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    fi
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    get_os $target
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    case $OPERATING_SYSTEM in
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        gentoo)
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            sed -i -e 's/.*ttyS0.*/s0:12345:respawn:\/sbin\/agetty 115200 ttyS0 vt100/' \
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                ${target}/etc/inittab
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            ;;
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        centos)
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            echo "s0:12345:respawn:/sbin/agetty 115200 ttyS0 vt100" >> \
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                ${target}/etc/inittab
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            ;;
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        debian|ubuntu)
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            sed -i -e 's/.*T0.*/T0:23:respawn:\/sbin\/getty -L ttyS0 115200 vt100/' \
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                ${target}/etc/inittab
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            ;;
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        *)
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            echo "No support for your OS in instance-image, skipping..."
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            ;;
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    esac
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}
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filesystem_check() {
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    local target=$1
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    if [ -z "$target" ] ; then
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        log_error "target not set for filesystem_check"
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        exit 1
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    fi
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    get_os $target
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    if [ "${OPERATING_SYSTEM}" = "fedora" ]; then
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        # we have to force a filesystem relabeling for SELinux after messing
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        # around with the filesystem in fedora
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        echo "Enforce an automatic relabeling in the initial boot process..."
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        touch $target/.autorelabel
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    fi
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}
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