#!/usr/bin/bash
#
# <umount>/usr/local/sbin/pam-umount.sh %(USER) %(USERUID) %(MNTPT)</umount>'

set -eu

usr="$1"
uid="$2"
mtp="$3"

shutdownVMs(){
    local VMs VM
    VMs="$(machinectl list --no-legend)"
    if [[ -n "$VMs" ]] ; then
	for VM in $VMs ; do
	    machinectl poweroff "$VM{VM%% *}" || true
	done
	sleep 3
    fi
    ## Check again:
    VMs="$(machinectl list --no-legend)"
    if [[ -n "$VMs" ]] ; then
	sleep 3
	for VM in $VMs ; do
	    machinectl terminate "${VM%% *}" || true
	done
    fi
    #killall -9 virtiofsd
}

unbindmnt(){
    local lmuh="/lmn/media/$usr/home"
    local lmus="/lmn/media/$usr/share"
    local N=0 mh=true ms=true

    mountpoint -q $lmuh || mh=false
    mountpoint -q $lmus || ms=false
    while [[ $N -lt 10 ]] && ([[ $mh = true ]] || [[ $ms = true ]]) ; do
	if [[ $mh = true ]] ; then
	    umount "$lmuh" && mh=false
	fi
	if [[ $ms = true ]] ; then
	    umount "$lmus" && ms=false
	fi
	N=$((N + 1))
	sleep 1
    done
    systemd-cat echo "Tried $N umount(s)."
}

######################

if [[ "$mtp" =~ "/srv/samba/schools" ]] ; then
    shutdownVMs
    unbindmnt
fi

## Just umount:
exec umount "$mtp"