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|
#!/bin/sh
set -e
# parse flags
while getopts "ng" opt; do
case "$opt" in
n) NET=1 ;;
g) GRAPHICS=1 ;;
\?) exit 1 ;;
esac
done
shift $((OPTIND - 1))
if [ -z "$@" ]; then
echo "Please enter a command"
exit 1
fi
args=""
a() { args="$args $@"; }
runcmds=""
r() { runcmds="$runcmds $@;"; }
# root fs setup
a --symlink usr/bin /bin
a --symlink bin /sbin
a --symlink usr/lib /lib
a --symlink usr/lib64 /lib64
a --proc /proc
a --dev /dev
a --tmpfs /tmp
# binaries and libraries
a --ro-bind /usr/lib /usr/lib/
a --ro-bind /usr/lib64 /usr/lib64/
a --ro-bind /usr/bin /usr/bin/
a --ro-bind /usr/libexec /usr/libexec/
# linker config
a --ro-bind /etc/ld.so.conf /etc/ld.so.conf
a --ro-bind /etc/ld.so.cache /etc/ld.so.cache
a --ro-bind /etc/ld.so.conf.d/ /etc/ld.so.conf.d/
# terminfo
a --ro-bind /usr/share/terminfo /usr/share/terminfo/
# bwrap config
a --unshare-all
a --as-pid-1
a --die-with-parent
a --new-session
a --hostname "localhost"
# environment setup
a --clearenv
a --setenv TERM "xterm"
# create passwd and groups for user
uid=$(id -u)
r "echo 'user::$uid:$uid::/home/user' > /etc/passwd"
r "echo 'user::$uid:' > /etc/group"
a --uid $uid --gid $uid
# create user home directory (it's the current working directory)
a --setenv HOME "/home/user"
a --bind "$PWD" "/home/user"
# networking option
if [ "${NET:-0}" -eq "1" ]; then
a --share-net
a --ro-bind /etc/resolv.conf /etc/resolv.conf
a --ro-bind /etc/ssl /etc/ssl
# certificates
a --ro-bind /etc/ca-certificates.conf /etc/ca-certificates.conf
a --ro-bind /etc/ca-certificates /etc/ca-certificates/
a --ro-bind /usr/share/ca-certificates /usr/share/ca-certificates/
fi
# graphics option
if [ "${GRAPHICS:-0}" -eq "1" ]; then
# create xdg runtime dir
new_xdg_rundir="/run/user/$uid"
r "mkdir -p $new_xdg_rundir"
a --setenv XDG_RUNTIME_DIR "$new_xdg_rundir"
# add wayland-0 and dri
a --ro-bind "$XDG_RUNTIME_DIR/wayland-0" "$new_xdg_rundir/wayland-0"
a --dev-bind /dev/dri /dev/dri
a --dev-bind /sys/dev/char/ /sys/dev/char
a --ro-bind /sys/devices/pci0000:00 /sys/devices/pci0000:00/
# xwayland x server
a --ro-bind "/tmp/.X11-unix" "/tmp/.X11-unix/"
a --setenv DISPLAY ":0"
# add pulse audio
a --ro-bind "$XDG_RUNTIME_DIR/pulse" "$new_xdg_rundir/pulse/"
# add usr share resources needed for graphical apps
a --ro-bind /usr/share/X11/locale/ /usr/share/X11/locale/
a --ro-bind /usr/share/X11/xkb /usr/share/X11/xkb/
a --ro-bind /usr/share/libdrm /usr/share/libdrm/
a --ro-bind /usr/share/drirc.d /usr/share/drirc.d/
a --ro-bind /usr/share/glvnd /usr/share/glvnd/
a --ro-bind /usr/share/fonts/ /usr/share/fonts/
fi
# run bubblewrap
bwrap $args sh -c "$runcmds $@"
# todo
# - [x] custom user setup with userid and an /etc/passwd
# - [x] opt in to allow wayland access
# - [ ] support working directories with spaces
# - [ ] tini as PID 1 for reaping children. (or you could remove the --as-pid-1 but that would expose the bwrap arguments to sandbox)
# - [ ] find a way to make bash not complain about no job control, or remove --new-session (but address the TIOCSTI in the room)
# - [ ] user runs under a proper root user who owns things
# useful examples: https://wiki.archlinux.org/title/Bubblewrap/Examples#Firefox
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