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xchroot
executable file
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xchroot
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#!/bin/sh -e
# xchroot DIR [CMD...] - chroot into a Void (or other Linux) installation
fail() {
printf '%s\n' "$1" >&2
exit 1
}
if [ "$(id -u)" -ne 0 ]; then
fail 'xchroot needs to run as root'
fi
CHROOT=$1; shift
[ -d "$CHROOT" ] || fail 'not a directory'
[ -d "$CHROOT/dev" ] || fail 'no /dev in chroot'
[ -d "$CHROOT/proc" ] || fail 'no /proc in chroot'
[ -d "$CHROOT/sys" ] || fail 'no /sys in chroot'
for _fs in dev proc sys; do
mount --rbind "/$_fs" "$CHROOT/$_fs"
mount --make-rslave "$CHROOT/$_fs"
done
touch "$CHROOT/etc/resolv.conf"
mount --bind /etc/resolv.conf "$CHROOT/etc/resolv.conf"
cleanup() {
umount -R "$CHROOT/dev" "$CHROOT/proc" "$CHROOT/sys" "$CHROOT/etc/resolv.conf"
}
trap cleanup EXIT INT
if [ -x "$CHROOT/$SHELL" ]; then
INNER_SHELL="$SHELL"
elif [ -x "$CHROOT/bin/bash" ]; then
INNER_SHELL="/bin/bash"
else
INNER_SHELL="/bin/sh"
fi
printf "\033[1m=> Entering chroot $CHROOT\033[m\n"
export PS1="[xchroot $CHROOT] $PS1"
chroot "$CHROOT" ${@:-$INNER_SHELL}
STATUS=$?
if [ $STATUS -ne 0 ]; then
printf "\033[1m=> Exited chroot $CHROOT\033[m\n"
else
printf "\033[1m=> Exited chroot $CHROOT with status $STATUS\033[m\n"
fi
exit $STATUS