root.sh

#!/bin/bash
#
# Copyright (C) 2017 Purism SPC
#
# SPDX-License-Identifier: GPL-3.0+
#


# distro and basedir set by calling script 
basedir=$1
image_name=$2
cwd=`pwd`
qemu="${basedir}/usr/bin/qemu-arm-static"
stamp=$basedir/var/log/gitrev.log


for env_var in distro pureos_board packages; do
    if [ -z "${!env_var}" ]; then
	echo "Must pass in \$${env_var} via the environment" 1>&2
	exit 1
    fi
done

set -e
set -u


mirror=deb.debian.org

echo "Configuring ${distro} in ${basedir} for board ${pureos_board}"

case ${pureos_board} in 
  imx6)
    fdt_file=imx6qp-nitrogen6_max_purism.dtb
    ;;
  imx8)
    echo "board type ${pureos_board} not configured yet"
    ;;
  qemu)
    echo "board type ${pureos_board} not configured yet"
    exit 1
    ;;
  *)
    echo "unrecognized board type ${pureos_board}"
    exit 1
    ;;
esac


# bindmount qemu into the rootfs so we can chroot into it if needed
function setup_qemu()
{
    [ -f ${qemu} ] || cp /usr/bin/qemu-arm-static "${qemu}"
}


function setup_kernel()
{
    local link="$(basename $basedir/boot/vmlinuz-*)"
    rm -f "${basedir}/boot/zImage"
    ln -s "${link}" "${basedir}/boot/zImage"

    mkdir -p "${basedir}/boot/dtbs"
    cp "${basedir}"/usr/lib/linux-image-*/${fdt_file} "${basedir}/boot/dtbs/"
}


function setup_uboot()
{
    sed -e "s/##DTBNAME##/${fdt_file}/" data/boot-${pureos_board}.txt.in > $basedir/boot/boot.txt
    mkimage -A arm -T script -O linux -d $basedir/boot/boot.txt $basedir/boot/boot.scr
    ln -fs boot.scr $basedir/boot/6x_bootscript

    [ ! -d files/uboot-${pureos_board} ] || cp -a files/uboot-${pureos_board}/* $basedir/boot/
}


function build_tarball()
{
   tarball="$(basename ${image_name} .img)".tar.xz
   pwd=$PWD

   echo -n "Taring up rootfs to $PWD/$tarball..."
   tar --acl \
       --exclude='./run/*' \
       --exclude='./dev/*' \
       --exclude='./sys/*' \
       --exclude='./proc/*' \
       -acf $PWD/$tarball -C $basedir .
   echo "Done."
}


function cleanup_chroot()
{
    chroot $basedir apt-get clean

    rm $basedir/etc/resolv.conf
    mv $basedir/etc/resolv.conf.bak $basedir/etc/resolv.conf
    rm $basedir/usr/sbin/policy-rc.d

    umount $basedir/dev/pts
    umount $basedir/dev
    umount $basedir/sys
    umount $basedir/proc

    # existence of stamp indicates success
    if [ -f $stamp ]; then
      build_tarball
    fi
}


function prepare_chroot()
{
    trap cleanup_chroot EXIT

    mount -t proc chproc $basedir/proc
    mount -t sysfs chsys $basedir/sys
    mount -t devtmpfs chdev $basedir/dev || mount --bind /dev $basedir/dev
    mount -t devpts chpts $basedir/dev/pts
    echo -e '#!/bin/sh\nexit 101' > $basedir/usr/sbin/policy-rc.d
    chmod 755 $basedir/usr/sbin/policy-rc.d
    mv $basedir/etc/resolv.conf $basedir/etc/resolv.conf.bak
    cp /etc/resolv.conf $basedir/etc
}


function create_stamp()
{
    git log --format=format:%H -1 > $stamp
}


function setup_gui()
{
    # Allow purism user to launch weston from the console, etc.
    for group in weston-launch video audio; do
        chroot $basedir adduser purism $group
    done
    # Will move into a debian package once we have build infra
    cp data/weston.service $basedir/etc/systemd/system/
    chroot $basedir systemctl enable weston.service
}


function setup_journal()
{
    # Enable systemd journal
    chroot $basedir mkdir -p /var/log/journal
    chroot $basedir systemd-tmpfiles --create --prefix /var/log/journal
    chroot $basedir apt-get -y remove rsyslog
    for l in daemon messages syslog kern mail user; do
        chroot $basedir rm -f /var/log/${l}.*
    done
}


function setup_sshd()
{
    [[ "$packages" =~ "openssh-server" ]] || return
    # Generate new host keys on first boot
    cp data/gen-sshd-host-keys "${basedir}/usr/local/bin/"
    cp data/sshd-host-keys.service "${basedir}/etc/systemd/system/"
    chroot $basedir systemctl enable sshd-host-keys.service
    chroot $basedir rm -f /etc/ssh/ssh_host_*
}


# We have to do this because task packages don't work with debootstrap
# (and won't).  See https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=841649
# other packages are better installed late to not confuse deboostrap about
# systemd and systemd-shim (e.g. libpam-systemd)
function install_pkgs()
{
    # Inspired by https://linux-sunxi.org/Mainline_Debian_HowTo
    (
        export DEBIAN_FRONTEND=noninteractive
        export DEBCONF_NONINTERACTIVE_SEEN=true
        export LC_ALL=C
        export LANGUAGE=C
        export LANG=C

        chroot $basedir apt-get -y update
        chroot $basedir apt-get -y install $packages
    )
}



# create the directories so that this script can be tested without the generated filesystem
mkdir -p $basedir/etc/apt/apt.conf.d/
mkdir -p $basedir/etc/network

cat << EOF > $basedir/etc/apt/sources.list
deb http://$mirror/debian $distro main contrib non-free
deb-src http://$mirror/debian $distro main contrib non-free
deb http://$mirror/debian $distro-updates main contrib non-free
deb-src http://$mirror/debian $distro-updates main contrib non-free
deb http://security.debian.org/debian-security $distro/updates main contrib non-free
deb-src http://security.debian.org/debian-security $distro/updates main contrib non-free
EOF

cat << EOT > $basedir/etc/apt/apt.conf.d/71-no-recommends
	APT::Install-Recommends "0";
	APT::Install-Suggests "0";
EOT

echo "pureos" > $basedir/etc/hostname


cat << EOF > $basedir/etc/hosts
127.0.0.1       pureos   localhost
::1             localhost ip6-localhost ip6-loopback
fe00::0         ip6-localnet
ff00::0         ip6-mcastprefix
ff02::1         ip6-allnodes
ff02::2         ip6-allrouters
EOF

cat << EOF > $basedir/etc/network/interfaces
auto lo
iface lo inet loopback

allow-hotplug eth0
iface eth0 inet dhcp
EOF


# Don't setup resolv.conf if it's a symlink
# DHCP will later handle this just fine
if [ -f $basedir/etc/resolv.conf ]; then
    cat <<EOF > $basedir/etc/resolv.conf
    nameserver 208.67.220.220
    nameserver 208.67.222.222
EOF
fi

export MALLOC_CHECK_=0 # workaround for LP: #520465
export LC_ALL=C
export DEBIAN_FRONTEND=noninteractive

cat << EOF > $basedir/debconf.set
console-common console-data/keymap/policy select Select keymap from full list
console-common console-data/keymap/full select en-latin1-nodeadkeys
EOF

prepare_chroot
setup_qemu
install_pkgs
setup_kernel
setup_uboot
setup_gui
setup_journal
setup_sshd
create_stamp

if [ -x files/local.sh ]; then
    echo "Warning: local.sh found, image is tainted"
    echo "tainted: true" >> files/meta.yml
    ./files/local.sh "$@"
fi