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#!/bin/sh
# fake/schroot-proposed -- emulate proposed mount behaviour for schroot
#
# This version emulates the behaviour proposed on #856877. If it needs
# changing, please update the proposed patch on #856877 too.
#
# Copyright © 2017-2023 Simon McVittie
# SPDX-License-Identifier: MIT
# (see debian/copyright)
set -e
# Reference: /etc/schroot/default/fstab
# (in schroot source tree: etc/profile-templates/default/linux/fstab)
bind_dev=yes
while true; do
case "$1" in
(--sbuild)
shift
# Reference: /etc/schroot/sbuild/fstab
# (source: etc/profile-templates/sbuild/linux/fstab)
bind_dev=no
;;
(*)
break
esac
done
CHROOT_PATH="$1"
shift
if test -z "$CHROOT_PATH" || test -z "$1"; then
echo "Usage: $0 CHROOT COMMAND...">&2
exit 2
fi
[ "$bind_dev" = no ] || mount --bind /dev "$CHROOT_PATH/dev"
mount -t devpts -o rw,newinstance,ptmxmode=666,mode=620,gid=5 /dev/pts "$CHROOT_PATH/dev/pts"
ls -l "/dev/ptmx" | sed -e 's/^/# fake-schroot: outside chroot: /' >&2
ls -l "/dev/pts/ptmx" | sed -e 's/^/# fake-schroot: outside chroot: /' >&2
ls -l "$CHROOT_PATH/dev/ptmx" | sed -e 's/^/# fake-schroot: after first step: /' >&2
ls -l "$CHROOT_PATH/dev/pts/ptmx" | sed -e 's/^/# fake-schroot: after first step: /' >&2
mounted_ptmx=no
# Depending on how /dev was set up, /dev/ptmx might either be
# character device (5,2), or a symbolic link to pts/ptmx.
# Either way we want it to be equivalent to /dev/pts/ptmx, assuming
# both exist.
if [ -e "$CHROOT_PATH/dev/pts/ptmx" ] && \
[ -e "$CHROOT_PATH/dev/ptmx" ] && \
! [ "$CHROOT_PATH/dev/pts/ptmx" -ef "$CHROOT_PATH/dev/ptmx" ]; then
mount --bind "$CHROOT_PATH/dev/pts/ptmx" "$CHROOT_PATH/dev/ptmx"
mounted_ptmx=yes
fi
mounted_console=no
# If schroot was invoked from a terminal, we still want to be able to
# access that terminal. lxc and systemd-nspawn achieve this by
# binding it onto /dev/console; so can we.
if stdin_tty="$(tty)"; then
if [ ! -e "$CHROOT_PATH/dev/console" ]; then
# We need something to mount onto, and it might as well be
# the correctly-numbered device node.
mknod -m700 "$CHROOT_PATH/dev/console" c 5 1
fi
mount --bind "$stdin_tty" "$CHROOT_PATH/dev/console"
mounted_console=yes
fi
ls -l "$CHROOT_PATH/dev/console" | sed -e 's/^/# fake-schroot: after fixing mounts: /' >&2
ls -l "$CHROOT_PATH/dev/ptmx" | sed -e 's/^/# fake-schroot: after fixing mounts: /' >&2
ls -l "$CHROOT_PATH/dev/pts/ptmx" | sed -e 's/^/# fake-schroot: after fixing mounts: /' >&2
e=0
chroot "$CHROOT_PATH" "$@" || e=$?
[ "$mounted_console" = no ] || umount "$CHROOT_PATH/dev/console"
[ "$mounted_ptmx" = no ] || umount "$CHROOT_PATH/dev/ptmx"
umount "$CHROOT_PATH/dev/pts"
[ "$bind_dev" = no ] || umount "$CHROOT_PATH/dev"
exit "$e"
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