ubuntu 14 preseed repack initrd

# Copies to the initrd, and also to the web dir but doesn't get used there.
installfiles() {
    seedfile="$1"
    seedfilename=$(basename "$seedfile")

    basedir=/srv/tftp/netboot/ubuntu14.04/
    webdir=/srv/www/netboot/ubuntu14.04

    if [ ! -e "$seedfile" ]; then
        echo "ERROR: could not find seed file: $seedfile"
        return 3
    fi

    echo "Copying \"$seedfile\" to \"$webdir\""
    cp "$seedfile" "$webdir"

    echo "Unpacking initrd.gz"
    mkdir -p "$basedir"/tmp
    rm -r "$basedir"/tmp/*
    if [ ! -e "$basedir"/tmp/ ]; then
        echo "ERROR: tmp dir could not be created"
        return 1
    fi
    if [ ! -e "$basedir"/ubuntu-installer/amd64/initrd.gz ]; then
        echo "ERROR: initrd.gz not found"
        return 2
    fi
    cd "$basedir"/tmp/
    gunzip -c "$basedir"/ubuntu-installer/amd64/initrd.gz | cpio -i

    echo "Packing \"$seedfilename\" into the initrd.gz (renamed to pressed.cfg)"
    cp "$webdir"/"$seedfilename" preseed.cfg
    find | cpio --create --format='newc' | gzip -c > "$basedir"/ubuntu-installer/amd64/initrd.gz

    echo "done"
}

installfiles ~/ubuntu14.seed