#!/bin/bash
if [ "$EUID" -ne 0 ]
  then echo "Please run as root"
  exit
fi
if [ -z "$1"  ]
  then echo "need arg $1 for chroot to make"
  exit
fi
chrootdir="$1"
echo "creating chroot '$chrootdir'"

# Create coriolis chroot dir in /opt
mkdir -p /opt/chroot/$chrootdir

# Install debootstrap and schroot
if [ -e /etc/debian_version ]; then
    # Debian detected: use apt
    apt install -y debootstrap schroot
elif [ -e /etc/arch-release ]; then
    # Arch Linux detected: use pacman
    pacman -S --needed debootstrap schroot
fi

# Install debian/buster chroot using debootstrap
/usr/sbin/debootstrap buster /opt/chroot/$chrootdir \
                      http://ftp.uk.debian.org/debian
echo "$chrootdir" > /opt/chroot/$chrootdir/etc/debian_chroot

# make chroot profile
mkdir -p /etc/schroot/$chrootdir
cp /etc/schroot/default/copyfiles /etc/schroot/$chrootdir
touch /etc/schroot/$chrootdir/nssdatabases

# create special fstab not bind-mounting /home
cat <<EOF >/etc/schroot/$chrootdir/fstab
# <file system> <mount point>   <type>  <options>       <dump>  <pass>
/proc           /proc           none    rw,bind         0       0
/sys            /sys            none    rw,bind         0       0
/dev            /dev            none    rw,bind         0       0
/dev/pts        /dev/pts        none    rw,bind         0       0
/tmp            /tmp            none    rw,bind         0       0
EOF

# Add chroot config to schroot.conf
cat <<EOF >>/etc/schroot/schroot.conf
[$chrootdir]
description=Debian Buster for $chrootdir
directory=/opt/chroot/$chrootdir
groups=sbuild-security,$SUDO_USER,users
type=directory
profile=$chrootdir
EOF

echo "Adding the following $chrootdir section to /etc/schroot/schroot.conf:

[$chrootdir]
description=Debian Buster for $chrootdir
directory=/opt/chroot/$chrootdir
groups=sbuild-security,$SUDO_USER,users
type=directory

This enables you to chroot into $chrootdir as an unprivileged user by running
'schroot -c $chrootdir /bin/bash'
"

# Install apt dependencies in the chroot
cd /tmp
schroot -c $chrootdir /bin/bash << EOF
echo Installing necessary apt dependencies in the chroot
apt-get update -y
apt-get upgrade -y
apt-get install -y automake binutils-dev build-essential \
ccache cmake gcc git \
libtool \
sysvinit-core \
sysvinit-utils \
sudo \
python2.7 \
python3 python3-pip \
python3-setuptools python3-dev

# yeah systemd in a chroot? not very funny joke.
apt-get remove -y systemd

# add sudo no password
echo '$SUDO_USER ALL=NOPASSWD: ALL' >> /etc/sudoers.d/$chrootdir

# Create user with same UID in the chroot
useradd -m -p `python3 -c 'import crypt; print (crypt.crypt("1234","Fx"))'` \
                -s /bin/bash $SUDO_USER -k /etc/skel
echo -e "
Added user ${SUDO_USER} with \e[1;91mpassword: 1234\e[0m"

# add deb-src to sources
echo deb-src http://ftp.debian.org/debian buster main > \
        /etc/apt/sources.list.d/bustersrc.list

echo -e "
\e[1;91mPlease use command 'passwd ${SUDO_USER}' to change this immediately after this script is run for security purposes.\e[0m
"

# Add convenience variable to chroot user .bash_profile
echo -e 'export PATH=/usr/lib/ccache:"\044PATH"\nexport DISPLAY=:0.0\n' > /home/$SUDO_USER/.bash_profile
chown $SUDO_USER /home/$SUDO_USER/.bash_profile
chgrp $SUDO_USER /home/$SUDO_USER/.bash_profile

echo -e "Added 'export PATH=/usr/lib/ccache:\"\044PATH\"\nexport DISPLAY=:0.0' to /home/$SUDO_USER/.bash_profile to speed up rebuilds"
EOF