arm-kali/chromebook-arm-nyan.sh

#!/bin/bash
set -e

# Uncomment to activate debug
# debug=true

if [ "$debug" = true ]; then
  exec > >(tee -a -i "${0%.*}.log") 2>&1
  set -x
fi

# Architecture
architecture=${architecture:-"armhf"}
# Generate a random machine name to be used.
machine=$(tr -cd 'A-Za-z0-9' < /dev/urandom | head -c16 ; echo)
# Custom hostname variable
hostname=${2:-kali}
# Custom image file name variable - MUST NOT include .img at the end.
imagename=${3:-kali-linux-$1-nyan}
# Suite to use, valid options are:
# kali-rolling, kali-dev, kali-bleeding-edge, kali-dev-only, kali-experimental, kali-last-snapshot
suite=${suite:-"kali-rolling"}
# Free space rootfs in MiB
free_space="300"
# /boot partition in MiB
bootsize="128"
# Select compression, xz or none
compress="xz"
# Choose filesystem format to format ( ext3 or ext4 )
fstype="ext3"
# If you have your own preferred mirrors, set them here.
mirror=${4:-"http://http.kali.org/kali"}
# Gitlab url Kali repository
kaligit="https://gitlab.com/kalilinux"
# Github raw url
githubraw="https://raw.githubusercontent.com"

# Check EUID=0 you can run any binary as root.
if [[ $EUID -ne 0 ]]; then
  echo "This script must be run as root"
  exit 1
fi

# Pass version number
if [[ $# -eq 0 ]] ; then
  echo "Please pass version number, e.g. $0 2.0, and (if you want) a hostname, default is kali"
  exit 0
fi

# Check exist bsp directory.
if [ ! -e "bsp" ]; then
  echo "Error: missing bsp directory structure"
  echo "Please clone the full repository ${kaligit}/build-scripts/kali-arm"
  exit 255
fi

# Current directory
current_dir="$(pwd)"
# Base directory
basedir=${current_dir}/nyan-"$1"
# Working directory
work_dir="${basedir}/kali-${architecture}"

# Check directory build
if [ -e "${basedir}" ]; then
  echo "${basedir} directory exists, will not continue"
  exit 1
elif [[ ${current_dir} =~ [[:space:]] ]]; then
  echo "The directory "\"${current_dir}"\" contains whitespace. Not supported."
  exit 1
else
  echo "The basedir thinks it is: ${basedir}"
  mkdir -p ${basedir}
fi

components="main,contrib,non-free"
arm="kali-linux-arm ntpdate"
base="apt-transport-https apt-utils bash-completion console-setup dialog e2fsprogs ifupdown initramfs-tools inxi iw man-db mlocate netcat-traditional net-tools parted pciutils psmisc rfkill screen tmux unrar usbutils vim wget whiptail zerofree"
desktop="kali-desktop-xfce kali-root-login xserver-xorg-video-fbdev xserver-xorg-input-libinput xserver-xorg-input-synaptics xfonts-terminus xinput"
tools="kali-linux-default"
services="apache2 atftpd"
extras="alsa-utils bc bison bluez bluez-firmware kali-linux-core libnss-systemd libssl-dev triggerhappy"

packages="${arm} ${base} ${services}"

kernel_release="R71-11151.B-chromeos-3.10"

# Automatic configuration to use an http proxy, such as apt-cacher-ng.
# You can turn off automatic settings by uncommenting apt_cacher=off.
# apt_cacher=off
# By default the proxy settings are local, but you can define an external proxy.
# proxy_url="http://external.intranet.local"
apt_cacher=${apt_cacher:-"$(lsof -i :3142|cut -d ' ' -f3 | uniq | sed '/^\s*$/d')"}
if [ -n "$proxy_url" ]; then
  export http_proxy=$proxy_url
elif [ "$apt_cacher" = "apt-cacher-ng" ] ; then
  if [ -z "$proxy_url" ]; then
    proxy_url=${proxy_url:-"http://127.0.0.1:3142/"}
    export http_proxy=$proxy_url
  fi
fi

# create the rootfs - not much to modify here, except maybe throw in some more packages if you want.
debootstrap --foreign --keyring=/usr/share/keyrings/kali-archive-keyring.gpg --include=kali-archive-keyring \
  --components=${components} --arch ${architecture} ${suite} ${work_dir} http://http.kali.org/kali

# systemd-nspawn enviroment
systemd-nspawn_exec(){
  qemu_bin=/usr/bin/qemu-arm-static
  LANG=C systemd-nspawn -q --bind-ro ${qemu_bin} -M ${machine} -D ${work_dir} "$@"
}

# debootstrap second stage
systemd-nspawn_exec /debootstrap/debootstrap --second-stage

cat << EOF > ${work_dir}/etc/apt/sources.list
deb ${mirror} ${suite} ${components//,/ }
#deb-src ${mirror} ${suite} ${components//,/ }
EOF

# Set hostname
echo "${hostname}" > ${work_dir}/etc/hostname

# So X doesn't complain, we add kali to hosts
cat << EOF > ${work_dir}/etc/hosts
127.0.0.1       ${hostname}    localhost
::1             localhost ip6-localhost ip6-loopback
fe00::0         ip6-localnet
ff00::0         ip6-mcastprefix
ff02::1         ip6-allnodes
ff02::2         ip6-allrouters
EOF

# Disable IPv6
cat << EOF > ${work_dir}/etc/modprobe.d/ipv6.conf
# Don't load ipv6 by default
alias net-pf-10 off
EOF

cat << EOF > ${work_dir}/etc/network/interfaces
auto lo
iface lo inet loopback
EOF

# DNS server
echo "nameserver 8.8.8.8" > ${work_dir}/etc/resolv.conf

# Copy directory bsp into build dir.
cp -rp bsp ${work_dir}

export MALLOC_CHECK_=0 # workaround for LP: #520465

# Enable the use of http proxy in third-stage in case it is enabled.
if [ -n "$proxy_url" ]; then
  echo "Acquire::http { Proxy \"$proxy_url\" };" > ${work_dir}/etc/apt/apt.conf.d/66proxy
fi

# Third stage
cat << EOF > ${work_dir}/third-stage
#!/bin/bash -e
export DEBIAN_FRONTEND=noninteractive
export RUNLEVEL=1
ln -sf /bin/true /usr/sbin/invoke-rc.d
echo -e "#!/bin/sh\nexit 101" > /usr/sbin/policy-rc.d
chmod 755 /usr/sbin/policy-rc.d

apt-get update

apt-get -y install binutils ca-certificates console-common cryptsetup-bin git initramfs-tools less locales nano u-boot-tools

# Create kali user with kali password... but first, we need to manually make some groups because they don't yet exist...
# This mirrors what we have on a pre-installed VM, until the script works properly to allow end users to set up their own... user.
# However we leave off floppy, because who a) still uses them, and b) attaches them to an SBC!?
# And since a lot of these have serial devices of some sort, dialout is added as well.
# scanner, lpadmin and bluetooth have to be added manually because they don't
# yet exist in /etc/group at this point.
groupadd -r -g 118 bluetooth
groupadd -r -g 113 lpadmin
groupadd -r -g 122 scanner
groupadd -g 1000 kali

useradd -m -u 1000 -g 1000 -G sudo,audio,bluetooth,cdrom,dialout,dip,lpadmin,netdev,plugdev,scanner,video,kali -s /bin/bash kali
echo "kali:kali" | chpasswd

aptops="--allow-change-held-packages -o dpkg::options::=--force-confnew"

# This looks weird, but we do it twice because every so often, there's a failure to download from the mirror
# So to workaround it, we attempt to install them twice.
apt-get install -y \$aptops ${packages} || apt-get --yes --fix-broken install
apt-get install -y \$aptops ${packages} || apt-get --yes --fix-broken install
apt-get install -y \$aptops ${desktop} ${extras} ${tools} || apt-get --yes --fix-broken install
apt-get install -y \$aptops ${desktop} ${extras} ${tools} || apt-get --yes --fix-broken install
apt-get install -y \$aptops --autoremove systemd-timesyncd || apt-get --yes --fix-broken install
apt-get dist-upgrade -y \$aptops

apt-get -y --allow-change-held-packages --purge autoremove

# Linux console/Keyboard configuration
echo 'console-common console-data/keymap/policy select Select keymap from full list' | debconf-set-selections
echo 'console-common console-data/keymap/full select en-latin1-nodeadkeys' | debconf-set-selections

# Copy all services
cp -p /bsp/services/all/*.service /etc/systemd/system/

# Regenerated the shared-mime-info database on the first boot
# since it fails to do so properly in a chroot.
systemctl enable smi-hack

# Generate SSH host keys on first run
systemctl enable regenerate_ssh_host_keys
# Enable sshd
systemctl enable ssh

cd /root
apt download -o APT::Sandbox::User=root ca-certificates 2>/dev/null

# Copy over the default bashrc
cp /etc/skel/.bashrc /root/.bashrc

# Set a REGDOMAIN.  This needs to be done or wireless doesn't work correctly on the RPi 3B+
sed -i -e 's/REGDOM.*/REGDOMAIN=00/g' /etc/default/crda

# Enable login over serial
echo "T0:23:respawn:/sbin/agetty -L ttyAMA0 115200 vt100" >> /etc/inittab

# Try and make the console a bit nicer
# Set the terminus font for a bit nicer display.
sed -i -e 's/FONTFACE=.*/FONTFACE="Terminus"/' /etc/default/console-setup
sed -i -e 's/FONTSIZE=.*/FONTSIZE="6x12"/' /etc/default/console-setup

# Fix startup time from 5 minutes to 15 secs on raise interface wlan0
sed -i 's/^TimeoutStartSec=5min/TimeoutStartSec=15/g' "/usr/lib/systemd/system/networking.service"

rm -f /usr/sbin/policy-rc.d
unlink /usr/sbin/invoke-rc.d
EOF

# Run third stage
chmod 755 ${work_dir}/third-stage
systemd-nspawn_exec /third-stage

# Clean system
systemd-nspawn_exec << EOF
rm -f /0
rm -rf /bsp
fc-cache -frs
rm -rf /tmp/*
rm -rf /etc/*-
rm -rf /hs_err*
rm -rf /userland
rm -rf /opt/vc/src
rm -f /etc/ssh/ssh_host_*
rm -rf /var/lib/apt/lists/*
rm -rf /var/cache/apt/*.bin
rm -rf /var/cache/apt/archives/*
rm -rf /var/cache/debconf/*.data-old
history -c
EOF
#Clear all logs
for logs in `find $work_dir/var/log -type f`; do > $logs; done

# Disable the use of http proxy in case it is enabled.
if [ -n "$proxy_url" ]; then
  unset http_proxy
  rm -rf ${work_dir}/etc/apt/apt.conf.d/66proxy
fi

# Mirror replacement
if [ ! -z "${@:5}" ]; then
  mirror=${@:5}
fi

# Define sources.list
cat << EOF > ${work_dir}/etc/apt/sources.list
deb ${mirror} ${suite} ${components//,/ }
#deb-src ${mirror} ${suite} ${components//,/ }
EOF

# Pull in the gcc 5.3 cross compiler to build the kernel.
# Debian uses a newer compiler and the chromebook kernel doesn't support
# that.
cd "${basedir}"
git clone --depth 1 https://gitlab.com/kalilinux/packages/gcc-arm-linux-gnueabihf-4-7.git gcc-arm-linux-gnueabihf-4.7

# Kernel section.  If you want to use a custom kernel, or configuration, replace
# them in this section.
cd "${basedir}"
git clone --depth 1 https://chromium.googlesource.com/chromiumos/third_party/kernel -b release-${kernel_release} ${work_dir}/usr/src/kernel
cd ${work_dir}/usr/src/kernel
mkdir -p ${work_dir}/usr/src/kernel/firmware/nvidia/tegra124/
cp ${work_dir}/lib/firmware/nvidia/tegra124/xusb.bin firmware/nvidia/tegra124/
cp ${current_dir}/kernel-configs/chromebook-3.10.config .config
cp ${current_dir}/kernel-configs/chromebook-3.10.config ${work_dir}/usr/src/nyan.config
git rev-parse HEAD > ${work_dir}/usr/src/kernel-at-commit
export ARCH=arm
# Edit the CROSS_COMPILE variable as needed.
export CROSS_COMPILE="${basedir}"/gcc-arm-linux-gnueabihf-4.7/bin/arm-linux-gnueabihf-
patch -p1 --no-backup-if-mismatch < ${current_dir}/patches/mac80211-3.8.patch
patch -p1 --no-backup-if-mismatch < ${work_dir}/patches/0001-mwifiex-do-not-create-AP-and-P2P-interfaces-upon-dri-3.8.patch
patch -p1 --no-backup-if-mismatch < ${work_dir}/patches/0001-Comment-out-a-pr_debug-print.patch
make WIFIVERSION="-3.8" oldconfig || die "Kernel config options added"
make WIFIVERSION="-3.8" -j $(grep -c processor /proc/cpuinfo)
make WIFIVERSION="-3.8" dtbs
make WIFIVERSION="-3.8" modules_install INSTALL_MOD_PATH=${work_dir}
cat << __EOF__ > ${work_dir}/usr/src/kernel/arch/arm/boot/kernel-nyan.its
/dts-v1/;

/ {
    description = "Chrome OS kernel image with one or more FDT blobs";
    #address-cells = <1>;
    images {
        kernel@1{
   description = "kernel";
            data = /incbin/("zImage");
            type = "kernel_noload";
            arch = "arm";
            os = "linux";
            compression = "none";
            load = <0>;
            entry = <0>;
        };
        fdt@1{
            description = "tegra124-nyan-big-rev0_2.dtb";
            data = /incbin/("dts/tegra124-nyan-big-rev0_2.dtb");
            type = "flat_dt";
            arch = "arm";
            compression = "none";
            hash@1{
                algo = "sha1";
            };
        };
        fdt@2{
            description = "tegra124-nyan-big-rev3_7.dtb";
            data = /incbin/("dts/tegra124-nyan-big-rev3_7.dtb");
            type = "flat_dt";
            arch = "arm";
            compression = "none";
            hash@1{
                algo = "sha1";
            };
        };
        fdt@3{
            description = "tegra124-nyan-big-rev8_9.dtb";
            data = /incbin/("dts/tegra124-nyan-big-rev8_9.dtb");
            type = "flat_dt";
            arch = "arm";
            compression = "none";
            hash@1{
                algo = "sha1";
            };
        };
        fdt@4{
            description = "tegra124-nyan-blaze.dtb";
            data = /incbin/("dts/tegra124-nyan-blaze.dtb");
            type = "flat_dt";
            arch = "arm";
            compression = "none";
            hash@1{
                algo = "sha1";
            };
        };
        fdt@5{
            description = "tegra124-nyan-rev0.dtb";
            data = /incbin/("dts/tegra124-nyan-rev0.dtb");
            type = "flat_dt";
            arch = "arm";
            compression = "none";
            hash@1{
                algo = "sha1";
            };
        };
        fdt@6{
            description = "tegra124-nyan-rev1.dtb";
            data = /incbin/("dts/tegra124-nyan-rev1.dtb");
            type = "flat_dt";
            arch = "arm";
            compression = "none";
            hash@1{
                algo = "sha1";
            };
        };
        fdt@7{
            description = "tegra124-nyan-kitty-rev0_3.dtb";
            data = /incbin/("dts/tegra124-nyan-kitty-rev0_3.dtb");
            type = "flat_dt";
            arch = "arm";
            compression = "none";
            hash@1{
                algo = "sha1";
            };
        };
        fdt@8{
            description = "tegra124-nyan-kitty-rev8.dtb";
            data = /incbin/("dts/tegra124-nyan-kitty-rev8.dtb");
            type = "flat_dt";
            arch = "arm";
            compression = "none";
            hash@1{
                algo = "sha1";
            };
        };
    };
    configurations {
        default = "conf@1";
        conf@1{
            kernel = "kernel@1";
            fdt = "fdt@1";
        };
        conf@2{
            kernel = "kernel@1";
            fdt = "fdt@2";
        };
        conf@3{
            kernel = "kernel@1";
            fdt = "fdt@3";
        };
        conf@4{
            kernel = "kernel@1";
            fdt = "fdt@4";
        };
        conf@5{
            kernel = "kernel@1";
            fdt = "fdt@5";
        };
        conf@6{
            kernel = "kernel@1";
            fdt = "fdt@6";
        };
        conf@7{
            kernel = "kernel@1";
            fdt = "fdt@7";
        };
        conf@8{
            kernel = "kernel@1";
            fdt = "fdt@8";
        };
    };
};
__EOF__
cd ${work_dir}/usr/src/kernel/arch/arm/boot
mkimage -f kernel-nyan.its nyan-big-kernel

# BEHOLD THE POWER OF PARTUUID/PARTNROFF
echo "noinitrd console=tty1 quiet root=PARTUUID=%U/PARTNROFF=1 rootwait rw lsm.module_locking=0 net.ifnames=0 rootfstype=ext3" > cmdline

# Pulled from ChromeOS, this is exactly what they do because there's no
# # bootloader in the kernel partition on ARM.
dd if=/dev/zero of=bootloader.bin bs=512 count=1

vbutil_kernel --arch arm --pack "${basedir}"/kernel.bin --keyblock /usr/share/vboot/devkeys/kernel.keyblock --signprivate /usr/share/vboot/devkeys/kernel_data_key.vbprivk --version 1 --config cmdline --bootloader bootloader.bin --vmlinuz nyan-big-kernel

cd ${work_dir}/usr/src/kernel
# Clean up our build of the kernel, then copy the config and run make
# modules_prepare so that users can more easily build kernel modules...
make WIFIVERSION="-3.8"  mrproper
cp ../nyan.config .config
cd "${basedir}"

# Fix up the symlink for building external modules
# kernver is used so we don't need to keep track of what the current compiled
# version is
kernver=$(ls ${work_dir}/lib/modules/)
cd ${work_dir}/lib/modules/${kernver}
rm build
rm source
ln -s /usr/src/kernel build
ln -s /usr/src/kernel source
cd "${basedir}"

# Lid switch
cat << EOF > ${work_dir}/etc/udev/rules.d/99-tegra-lid-switch.rules
ACTION=="remove", GOTO="tegra_lid_switch_end"
SUBSYSTEM=="input", KERNEL=="event*", SUBSYSTEMS=="platform", KERNELS=="gpio-keys.4", TAG+="power-switch"
LABEL="tegra_lid_switch_end"
EOF

# Bit of a hack, this is so the eMMC doesn't show up on the desktop
cat << EOF > ${work_dir}/etc/udev/rules.d/99-hide-emmc-partitions.rules
KERNEL=="mmcblk0*", ENV{UDISKS_IGNORE}="1"
EOF

# Disable uap0 and p2p0 interfaces in NetworkManager
mkdir -p ${work_dir}/etc/NetworkManager/
printf '\n[keyfile]\nunmanaged-devices=interface-name:p2p0\n' >> ${work_dir}/etc/NetworkManager/NetworkManager.conf

#nvidia device nodes
cat << EOF > ${work_dir}/lib/udev/rules.d/51-nvrm.rules
KERNEL=="knvmap", GROUP="video", MODE="0660"
KERNEL=="nvhdcp1", GROUP="video", MODE="0660"
KERNEL=="nvhost-as-gpu", GROUP="video", MODE="0660"
KERNEL=="nvhost-ctrl", GROUP="video", MODE="0660"
KERNEL=="nvhost-ctrl-gpu", GROUP="video", MODE="0660"
KERNEL=="nvhost-dbg-gpu", GROUP="video", MODE="0660"
KERNEL=="nvhost-gpu", GROUP="video", MODE="0660"
KERNEL=="nvhost-msenc", GROUP="video", MODE="0660"
KERNEL=="nvhost-prof-gpu", GROUP="video", MODE="0660"
KERNEL=="nvhost-tsec", GROUP="video", MODE="0660"
KERNEL=="nvhost-vic", GROUP="video", MODE="0660"
KERNEL=="nvmap", GROUP="video", MODE="0660"
KERNEL=="tegra_dc_0", GROUP="video", MODE="0660"
KERNEL=="tegra_dc_1", GROUP="video", MODE="0660"
KERNEL=="tegra_dc_ctrl", GROUP="video", MODE="0660"
EOF

# Touchpad configuration
mkdir -p ${work_dir}/etc/X11/xorg.conf.d
cp ${current_dir}/bsp/xorg/10-synaptics-chromebook.conf ${work_dir}/etc/X11/xorg.conf.d/

# lp0 resume firmware...
# Check https://chromium.googlesource.com/chromiumos/overlays/chromiumos-overlay/+/master/sys-kernel/tegra_lp0_resume/
# to find the lastest commit to use (note: CROS_WORKON_COMMIT )
cd "${basedir}"
git clone https://chromium.googlesource.com/chromiumos/third_party/coreboot
cd "${basedir}"/coreboot
git checkout fb840ee4195f9c365375e8914e243ce2f5e4f7bf
make -C src/soc/nvidia/tegra124/lp0 GCC_PREFIX=arm-linux-gnueabihf-
mkdir -p ${work_dir}/lib/firmware/tegra12x/
cp src/soc/nvidia/tegra124/lp0/tegra_lp0_resume.fw ${work_dir}/lib/firmware/tegra12x/
cd "${basedir}"

# Calculate the space to create the image.
root_size=$(du -s -B1 ${work_dir} --exclude=${work_dir}/boot | cut -f1)
root_extra=$((${root_size}/1024/1000*5*1024/5))
raw_size=$(($((${free_space}*1024))+${root_extra}+$((${bootsize}*1024))+4096))

# Create the disk and partition it
echo "Creating image file ${imagename}.img"
fallocate -l $(echo ${raw_size}Ki | numfmt --from=iec-i --to=si) ${current_dir}/${imagename}.img
parted ${current_dir}/${imagename}.img --script -- mklabel gpt
cgpt create -z ${current_dir}/${imagename}.img
cgpt create ${current_dir}/${imagename}.img

cgpt add -i 1 -t kernel -b 8192 -s 32768 -l kernel -S 1 -T 5 -P 10 ${current_dir}/${imagename}.img
cgpt add -i 2 -t data -b 40960 -s `expr $(cgpt show ${current_dir}/${imagename}.img | grep 'Sec GPT table' | awk '{ print \$1 }')  - 40960` -l Root ${current_dir}/${imagename}.img

loopdevice=`losetup -f --show ${current_dir}/${imagename}.img`
device=`kpartx -va ${loopdevice} | sed 's/.*\(loop[0-9]\+\)p.*/\1/g' | head -1`
sleep 5
device="/dev/mapper/${device}"
bootp=${device}p1
rootp=${device}p2

if [[ $fstype == ext4 ]]; then
  features="-O ^64bit,^metadata_csum"
elif [[ $fstype == ext3 ]]; then
  features="-O ^64bit"
fi
mkfs $features -t $fstype -L ROOTFS ${rootp}

mkdir -p "${basedir}"/root
mount ${rootp} "${basedir}"/root

# We do this down here to get rid of the build system's resolv.conf after running through the build.
cat << EOF > ${work_dir}/etc/resolv.conf
nameserver 8.8.8.8
EOF

# Create an fstab so that we don't mount / read-only.
UUID=$(blkid -s UUID -o value ${rootp})
echo "UUID=$UUID /               ext3    errors=remount-ro 0       1" >> ${work_dir}/etc/fstab

echo "Rsyncing rootfs into image file"
rsync -HPavz -q ${work_dir}/ ${basedir}/root/

# Unmount partitions
sync
umount ${rootp}

dd if="${basedir}"/kernel.bin of=${bootp}

cgpt repair ${loopdevice}

kpartx -dv ${loopdevice}
losetup -d ${loopdevice}


# Limite use cpu function
limit_cpu (){
  rand=$(tr -cd 'A-Za-z0-9' < /dev/urandom | head -c4 ; echo) # Randowm name group
  cgcreate -g cpu:/cpulimit-${rand} # Name of group cpulimit
  cgset -r cpu.shares=800 cpulimit-${rand} # Max 1024
  cgset -r cpu.cfs_quota_us=80000 cpulimit-${rand} # Max 100000
  # Retry command
  local n=1; local max=5; local delay=2
  while true; do
    cgexec -g cpu:cpulimit-${rand} "$@" && break || {
      if [[ $n -lt $max ]]; then
        ((n++))
        echo -e "\e[31m Command failed. Attempt $n/$max \033[0m"
        sleep $delay;
      else
        echo "The command has failed after $n attempts."
        break
      fi
    }
  done
}

if [ $compress = xz ]; then
  if [ $(arch) == 'x86_64' ]; then
    echo "Compressing ${imagename}.img"
    limit_cpu pixz -p 2 ${current_dir}/${imagename}.img # -p Nº cpu cores use
    chmod 644 ${current_dir}/${imagename}.img.xz
  fi
else
  chmod 644 ${current_dir}/${imagename}.img
fi

# Clean up all the temporary build stuff and remove the directories.
# Comment this out to keep things around if you want to see what may have gone
# wrong.
echo "Removing temporary build files"
rm -rf "${basedir}"