#!/bin/bash
#
# .---.                  .              .
# |                      |              |
# |--- .--. .-.  .-.  .-.|  .-. .--.--. |.-.  .-. .--.  .-.
# |    |   (.-' (.-' (   | (   )|  |  | |   )(   )|  | (.-'
# '    '     --'  --'  -' -  -' '  '   -' -'   -' '   -  --'
#
#                    Freedom in the Cloud
#
# Based on bin/freedombox-customize from freedom-maker
#
# License
# =======
#
# This program is free software: you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation, either version 3 of the License, or
# (at your option) any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program.  If not, see <http://www.gnu.org/licenses/>.

set -e
set -x

PROJECT_NAME='freedombone'

# username created by default within a debian image
GENERIC_IMAGE_USERNAME='fbone'

export TEXTDOMAIN=${PROJECT_NAME}-image-customise
export TEXTDOMAINDIR="/usr/share/locale"

# Whether to minimise the number of decisions during interactive install
MINIMAL_INSTALL="yes"

MY_USERNAME='debian'
MY_PASSWORD="${PROJECT_NAME}"

# IP address of the router (gateway)
ROUTER_IP_ADDRESS="192.168.1.254"

# The fixed IP address of the Beaglebone Black on your local network
BOX_IP_ADDRESS="192.168.1.55"

# DNS
NAMESERVER1='213.73.91.35'
NAMESERVER2='85.214.20.141'

# optional configuration file containing freedombone settings
CONFIG_FILENAME=

# Optional ssh public key to allow
SSH_PUBKEY="no"

# Whether this is a generic image for mass redistribution on the interwebs
GENERIC_IMAGE="no"

# default SSH port
SSH_PORT=2222

enable_eatmydata_override() {
    chroot $rootdir apt-get install --no-install-recommends -y eatmydata
    if [ -x $rootdir/usr/bin/eatmydata ] && \
        [ ! -f $rootdir/etc/apt/apt.conf.d/95debian-edu-install-dpkg-eatmydata ]; then
        echo $"info: Adding apt config to call dpkg via eatmydata"
        printf "#!/bin/sh\nexec eatmydata dpkg \"\$@\"\n" \
            > $rootdir/var/tmp/dpkg-eatmydata
        chmod 755 $rootdir/var/tmp/dpkg-eatmydata
        cat > $rootdir/etc/apt/apt.conf.d/95debian-edu-install-dpkg-eatmydata <<EOF
Dir::Bin::dpkg "/var/tmp/dpkg-eatmydata";
EOF
    else
        echo $"error: unable to find /usr/bin/eatmydata after installing the eatmydata package"
    fi
}

disable_eatmydata_override() {
    for override in \
        /etc/apt/apt.conf.d/95debian-edu-install-dpkg-eatmydata \
        /var/tmp/dpkg-eatmydata ; do
        echo $"info: Removing apt config to call dpkg via eatmydata"
        if [ -f $rootdir$override ] ; then
            rm -f $rootdir$override
        else
            echo $"warning: missing $rootdir$override"
        fi
    done
    sync # Flush file buffers before continuing
}

set_apt_sources() {
    NEW_MIRROR="$1"
    COMPONENTS="main"

    cat <<EOF > etc/apt/sources.list
deb $NEW_MIRROR $SUITE $COMPONENTS
deb-src $NEW_MIRROR $SUITE $COMPONENTS

#deb http://security.debian.org/ $SUITE/updates main
#deb-src http://security.debian.org/ $SUITE/updates main
EOF
}

configure_networking() {
    if [[ $GENERIC_IMAGE == "no" ]]; then
        echo "# This file describes the network interfaces available on your system
# and how to activate them. For more information, see interfaces(5).

# The loopback network interface
auto lo
iface lo inet loopback

# The primary network interface
auto eth0
iface eth0 inet static
    address $BOX_IP_ADDRESS
    netmask 255.255.255.0
    gateway $ROUTER_IP_ADDRESS
    dns-nameservers $NAMESERVER1 $NAMESERVER2
# Example to keep MAC address between reboots
#hwaddress ether B5:A2:BE:3F:1A:FE

# The secondary network interface
#auto eth1
#iface eth1 inet dhcp

# WiFi Example
#auto wlan0
#iface wlan0 inet dhcp
#    wpa-ssid \"essid\"
#    wpa-psk  \"password\"

# Ethernet/RNDIS gadget (g_ether)
# ... or on host side, usbnet and random hwaddr
# Note on some boards, usb0 is automaticly setup with an init script
#iface usb0 inet static
#    address 192.168.7.2
#    netmask 255.255.255.0
#    network 192.168.7.0
#    gateway 192.168.7.1" > $rootdir/etc/network/interfaces

        hexarray=( 1 2 3 4 5 6 7 8 9 0 a b c d e f )
        a=${hexarray[$RANDOM%16]}${hexarray[$RANDOM%16]}
        b=${hexarray[$RANDOM%16]}${hexarray[$RANDOM%16]}
        c=${hexarray[$RANDOM%16]}${hexarray[$RANDOM%16]}
        d=${hexarray[$RANDOM%16]}${hexarray[$RANDOM%16]}
        e=${hexarray[$RANDOM%16]}${hexarray[$RANDOM%16]}
        sed -i "s|#hwaddress ether.*|hwaddress ether de:$a:$b:$c:$d:$e|g" \
            $rootdir/etc/network/interfaces
    fi

    sed -i "s/nameserver.*/nameserver $NAMESERVER1/g" $rootdir/etc/resolv.conf
    sed -i "/nameserver $NAMESERVER1/a\nameserver $NAMESERVER2" $rootdir/etc/resolv.conf

    # change the motd to show further install instructions
    echo $"
 .---.                  .              .
 |                      |              |
 |--- .--. .-.  .-.  .-.|  .-. .--.--. |.-.  .-. .--.  .-.
 |    |   (.-' (.-' (   | (   )|  |  | |   )(   )|  | (.-'
 '    '     --'  --'  -' -  -' '  '   -' -'   -' '   -  --'

                    Initial base install

Your system is not yet installed. To complete the process run the
following commands, then enter your details.

    sudo su
    ${PROJECT_NAME} menuconfig

" > $rootdir/etc/motd
}

configure_ssh() {
    sed -i "s/Port .*/Port ${SSH_PORT}/g" $rootdir/etc/ssh/sshd_config

    if [[ "$SSH_PUBKEY" != "no" ]]; then
        if [ ! -d $rootdir/home/$MY_USERNAME/.ssh ]; then
            mkdir $rootdir/home/$MY_USERNAME/.ssh
        fi
        echo "$SSH_PUBKEY" > $rootdir/home/$MY_USERNAME/.ssh/authorized_keys
        chroot $rootdir chown -R $MY_USERNAME:$MY_USERNAME /home/$MY_USERNAME/.ssh
        sed -i 's|PasswordAuthentication.*|PasswordAuthentication no|g' $rootdir/etc/ssh/sshd_config
        echo $"Using ssh public key:"
        echo $SSH_PUBKEY
        echo $'Password ssh authentication turned off'
    fi
}

admin_user_sudo() {
    echo "$MY_USERNAME  ALL=(ALL) ALL" >> $rootdir/etc/sudoers
}

create_generic_image() {
    if [[ $GENERIC_IMAGE == "no" ]]; then
        return
    fi
    # Don't install any configuration. This will be a base system
    CONFIG_FILENAME=
    # The presence of this file indicates that the initial
    # setup has not yet been completed
    touch $rootdir/home/$MY_USERNAME/.initial_setup
    chroot $rootdir chown $MY_USERNAME:$MY_USERNAME /home/$MY_USERNAME/.initial_setup
    touch $rootdir/root/.initial_setup

    cat >> $rootdir/home/$MY_USERNAME/.bashrc <<EOF
# initial setup of the system
if [ -f ~/.initial_setup ]; then
    clear
    echo "
 .---.                  .              .
 |                      |              |
 |--- .--. .-.  .-.  .-.|  .-. .--.--. |.-.  .-. .--.  .-.
 |    |   (.-' (.-' (   | (   )|  |  | |   )(   )|  | (.-'
 '    '     --'  --'  -' -  -' '  '   -' -'   -' '   -  --'

                   Initial setup process

          Please enter your password a second time.
"
    sudo su
fi
EOF

    cat >> $rootdir/root/.bashrc <<EOF
# initial setup of the system
if [ -f ~/.initial_setup ]; then
EOF
    echo '    if [ -f ~/login.txt ]; then' >> $rootdir/root/.bashrc
    echo '        NEW_USER_PASSWORD=$(printf `cat ~/login.txt`)' >> $rootdir/root/.bashrc
    echo '    else' >> $rootdir/root/.bashrc
    echo '        ENTROPY=$(cat /proc/sys/kernel/random/entropy_avail)' >> $rootdir/root/.bashrc
    echo '        if [ $ENTROPY -lt 500 ]; then' >> $rootdir/root/.bashrc
    echo '            dialog --backtitle "Initial setup process" --title "Password Generation" --msgbox "WARNING: The entropy available on this system is too low to generate a password.\n\nThe installation process cannot continue." 8 50' >> $rootdir/root/.bashrc
    echo '            exit' >> $rootdir/root/.bashrc
    echo '        fi' >> $rootdir/root/.bashrc
    echo '        NEW_USER_PASSWORD="$(openssl rand -base64 12 | cut -c1-10)"' >> $rootdir/root/.bashrc
    echo '    fi' >> $rootdir/root/.bashrc
    echo '    echo "${NEW_USER_PASSWORD}" > ~/login.txt' >> $rootdir/root/.bashrc

    echo '    clear' >> $rootdir/root/.bashrc
    echo '    echo ""' >> $rootdir/root/.bashrc
    echo '    echo "Your new login password is:"' >> $rootdir/root/.bashrc
    echo '    echo ""' >> $rootdir/root/.bashrc
    echo '    toilet "${NEW_USER_PASSWORD}"' >> $rootdir/root/.bashrc
    echo '    echo ""' >> $rootdir/root/.bashrc
    echo '    echo "                          ${NEW_USER_PASSWORD}"' >> $rootdir/root/.bashrc
    echo '    echo ""' >> $rootdir/root/.bashrc
    echo '    echo "Use it whenever you wish to ssh into this system."' >> $rootdir/root/.bashrc
    echo '    echo ""' >> $rootdir/root/.bashrc
    echo '    echo "IMPORTANT: Please take a moment to enter the above password into a"' >> $rootdir/root/.bashrc
    echo '    echo "password manager or write it down somewhere."' >> $rootdir/root/.bashrc
    echo '    echo ""' >> $rootdir/root/.bashrc
    echo '    read -n1 -r -p "Press any key to continue..." key' >> $rootdir/root/.bashrc

    # change the password for the admin user
    echo -n "    echo \"${MY_USERNAME}:" >> $rootdir/root/.bashrc
    echo '$(printf `cat ~/login.txt`)"|chpasswd' >> $rootdir/root/.bashrc

    # update before continuing
    echo "    cd /root/${PROJECT_NAME}" >> $rootdir/root/.bashrc
    echo "    git stash" >> $rootdir/root/.bashrc
    echo "    git pull" >> $rootdir/root/.bashrc
    echo "    make install" >> $rootdir/root/.bashrc

    if [[ $MINIMAL_INSTALL == "no" ]]; then
        echo "    ${PROJECT_NAME} menuconfigfull" >> $rootdir/root/.bashrc
    else
        echo "    ${PROJECT_NAME} menuconfig" >> $rootdir/root/.bashrc
    fi
    echo '    if [ "$?" = "0" ]; then' >> $rootdir/root/.bashrc
    echo "        if [ -f ~/${PROJECT_NAME}-completed.txt ]; then" >> $rootdir/root/.bashrc
    # Remove the initial setup files
    echo '            rm /root/.initial_setup' >> $rootdir/root/.bashrc
    echo "            rm /home/${MY_USERNAME}/.initial_setup" >> $rootdir/root/.bashrc
    echo "            touch /root/.remove_${GENERIC_IMAGE_USERNAME}" >> $rootdir/root/.bashrc
    echo '            shred -zu ~/login.txt' >> $rootdir/root/.bashrc
    echo '            dialog --title "Congratulations!" --msgbox "\nYour Freedombone system has now installed\n\nPress any key to reboot and begin using it" 9 50' >> $rootdir/root/.bashrc

    echo '            reboot' >> $rootdir/root/.bashrc
    echo '        fi' >> $rootdir/root/.bashrc
    echo '    fi' >> $rootdir/root/.bashrc
    echo '    exit' >> $rootdir/root/.bashrc
    echo 'else' >> $rootdir/root/.bashrc
    echo '    # Remove default account after install' >> $rootdir/root/.bashrc
    echo "    if [ -f /root/.remove_${GENERIC_IMAGE_USERNAME} ]; then" >> $rootdir/root/.bashrc
    echo "        if [ -d /home/${GENERIC_IMAGE_USERNAME} ]; then" >> $rootdir/root/.bashrc
    echo "           userdel -r ${GENERIC_IMAGE_USERNAME}" >> $rootdir/root/.bashrc
    echo "           if [ -d /home/${GENERIC_IMAGE_USERNAME} ]; then" >> $rootdir/root/.bashrc
    echo "               rm -rf /home/${GENERIC_IMAGE_USERNAME}" >> $rootdir/root/.bashrc
    echo "               rm /root/.remove_${GENERIC_IMAGE_USERNAME}" >> $rootdir/root/.bashrc
    echo '           fi' >> $rootdir/root/.bashrc
    echo '        fi' >> $rootdir/root/.bashrc
    echo '    fi' >> $rootdir/root/.bashrc
    echo 'fi' >> $rootdir/root/.bashrc
}

continue_installation() {
    # If a configuration file exists then run with it
    # otherwise the interactive installer can be used
    # This is equivalent to installing freedombox-setup on freedombox
    if [ $CONFIG_FILENAME ]; then
        if [ ${#CONFIG_FILENAME} -gt 2 ]; then
            cp $CONFIG_FILENAME $rootdir/root/$PROJECT_NAME.cfg
            chroot $rootdir $PROJECT_NAME -c /root/$PROJECT_NAME.cfg
        fi
    fi
}

# Set to true/false to control if eatmydata is used during build
use_eatmydata=true

rootdir="$1"
fmdir="$(pwd)"
image="$fmdir"/"$2"
cd "$rootdir"

echo info: building $MACHINE for $ARCHITECTURE

export DEBIAN_FRONTEND=noninteractive DEBCONF_NONINTERACTIVE_SEEN=true
export LC_ALL=C LANGUAGE=C LANG=C

# Override libpam-tmpdir setting during build, as the directories
# are not created yet.
export TMP=/tmp/ TMPDIR=/tmp/

username=$MY_USERNAME
echo $"warning: creating initial user $username with well known password!"
password=$MY_PASSWORD
chroot "$rootdir" adduser --gecos $username --disabled-password $username
echo $username:$password | chroot $rootdir /usr/sbin/chpasswd
chroot "$rootdir" adduser $username sudo

case "$MACHINE" in
    virtualbox)
        # hide irrelevant console keyboard messages.
        echo "echo \"4 4 1 7\" > /proc/sys/kernel/printk" \
            >> /etc/init.d/rc.local
        ;;
    qemu)
        # hide irrelevant console keyboard messages.
        echo "echo \"4 4 1 7\" > /proc/sys/kernel/printk" \
            >> /etc/init.d/rc.local
        ;;
esac

set_apt_sources $BUILD_MIRROR
chroot "$rootdir" apt-get update

cat > $rootdir/usr/sbin/policy-rc.d <<EOF
#!/bin/sh
exit 101
EOF
chmod a+rx $rootdir/usr/sbin/policy-rc.d

if $use_eatmydata ; then
    enable_eatmydata_override
fi

if [ -n "$CUSTOM_SETUP" ]; then
    cp "$CUSTOM_SETUP" "$rootdir"/tmp
    chroot "$rootdir" apt-get install -y gdebi-core
    chroot "$rootdir" gdebi -n /tmp/"$(basename $CUSTOM_SETUP)"
fi

chroot "$rootdir" apt-get install -y sudo git dialog toilet build-essential openssh-server
chroot "$rootdir" apt-get install -y avahi-daemon avahi-utils avahi-discover avahi-autoipd
chroot "$rootdir" apt-get install -y iptables dnsutils net-tools network-manager iputils-ping
chroot "$rootdir" apt-get install -y libnss-mdns libnss-myhostname libnss-gw-name nano man ntp
chroot "$rootdir" apt-get install -y locales locales-all debconf

sed -i "s|#host-name=.*|host-name=${PROJECT_NAME}|g" $rootdir/etc/avahi/avahi-daemon.conf

chroot "$rootdir" /bin/bash -x <<EOF
git clone https://github.com/bashrc/freedombone /root/freedombone
cd /root/freedombone
make install
EOF

chroot "$rootdir" ${PROJECT_NAME}-image-hardware-setup 2>&1 | \
    tee $rootdir/var/log/${PROJECT_NAME}-image-hardware-setup.log

rm $rootdir/usr/sbin/policy-rc.d

# Set up HRNG for systems known to have one
# Otherwise install haveged
if [[ "$MACHINE" != "beaglebone" ]]; then
    chroot $rootdir apt-get -y install haveged
else
    chroot $rootdir apt-get -y install rng-tools
    sed -i 's|#HRNGDEVICE=/dev/hwrng|HRNGDEVICE=/dev/hwrng|g' $rootdir/etc/default/rng-tools
fi

# copy u-boot to beginning of image
case "$MACHINE" in
    beaglebone)
        dd if=$rootdir/usr/lib/u-boot/am335x_boneblack/MLO of="$image" \
           count=1 seek=1 conv=notrunc bs=128k
        dd if=$rootdir/usr/lib/u-boot/am335x_boneblack/u-boot.img of="$image" \
           count=2 seek=1 conv=notrunc bs=384k
        ;;
    cubieboard2)
        dd if=$rootdir/usr/lib/u-boot/Cubieboard2/u-boot-sunxi-with-spl.bin of="$image" \
           seek=8 conv=notrunc bs=1k
        ;;
esac

if $use_eatmydata ; then
    disable_eatmydata_override
fi

set_apt_sources $MIRROR
chroot "$rootdir" apt-get update

configure_ssh
configure_networking
admin_user_sudo
create_generic_image
continue_installation

cd /
echo $"info: killing leftover processes in chroot"
fuser -mvk $rootdir/. || true
