Steam in Chroot

README.md

You may follow Gentoo Wiki (or other guides) to install steam in chroot first. But you may failed to launch games like Dota2, because steam is using something called soldier and bwrap.

The steam.sh below can make soldier and bwrap work by mount chroot_dir twice. this works fine for me.

Save steam.sh file to /usr/local/bin/steam, so you can run steam command in terminal to launch steam, or add steam deeplink like steam steam://install/xxx.

To start steam without ask sudo password, add this to your sudoers file:

%wheel ALL=(ALL) NOPASSWD: /usr/local/bin/steam

steam.sh

#!/bin/bash

# Enable log
# exec 1>/dev/shm/steam.log 2>&1

# Check Root permission
if [[ $EUID -ne 0 ]]; then
	sudo $0 $@
	exit $?
fi

# steam chroot bits
chroot_arch="linux64"

# steam chroot directory, you may change this
chroot_dir="/opt/steam"

# user home directory path outside chroot, you may need to change this
user_home="/home/liming"

if mountpoint -q "${chroot_dir}"; then
  # steam folder already mounted, maybe steam is already running
  "${chroot_arch}" chroot "${chroot_dir}" su -c "steam -no-cef-sandbox ${@}" steam
  exit 0
fi

# umount the chroot directories when steam exits
cleanup() {
  for mnt in /home/steam/.config/pulse /var/lib/dbus /tmp /run /dev /sys /proc; do
    umount -vl "${chroot_dir}${mnt}"
  done
  # umount twice
  umount -vl "${chroot_dir}"
  umount -vl "${chroot_dir}"
}
trap cleanup EXIT

# mount the chroot directories, first three lines are the magic to make `soldier` and `bwrap` work in chroot
mount -v --bind "${chroot_dir}" "${chroot_dir}"
mount -v --make-private "${chroot_dir}"
mount -v --bind "${chroot_dir}" "${chroot_dir}"
mount -v --types proc /proc "${chroot_dir}/proc"
for mnt in /sys /dev /run /tmp /var/lib/dbus; do
  mount -v --rbind "${mnt}" "${chroot_dir}${mnt}"
  mount -v --make-rslave "${chroot_dir}${mnt}"
done
mount -v --rbind "${user_home}/.config/pulse" "${chroot_dir}/home/steam/.config/pulse"
mount -v --make-rslave "${chroot_dir}/home/steam/.config/pulse"

# Use cookie for X auth
cp --preserve "${user_home}/.Xauthority" "${chroot_dir}/home/liming/.Xauthority"

# chroot, substitute user, and start steam
#"${chroot_arch}" chroot "${chroot_dir}" su -c '/bin/bash -l' steam
#"${chroot_arch}" chroot "${chroot_dir}" su -c '/bin/bash -l' root
"${chroot_arch}" chroot "${chroot_dir}" su -c "steam -no-cef-sandbox ${@}" steam