#!/bin/bash
# Helpful to read output when debugging
set -x

long_delay=10
medium_delay=5
short_delay=1
echo "Beginning of startup!"

function stop_display_manager_if_running {
    # Stop dm using systemd
    if command -v systemctl; then
        if systemctl is-active --quiet "$1.service" ; then
            echo $1 >> /tmp/vfio-store-display-manager
            systemctl stop "$1.service"
        fi

        while systemctl is-active --quiet "$1.service" ; do
            sleep "${short_delay}"
        done

        return
    fi

    # Stop dm using runit
    if command -v sv; then
        if sv status $1 ; then
            echo $1 >> /tmp/vfio-store-display-manager
            sv stop $1
        fi
    fi
}


# Stop currently running display manager
if test -e "/tmp/vfio-store-display-manager" ; then
    rm -f /tmp/vfio-store-display-manager
fi

stop_display_manager_if_running sddm
stop_display_manager_if_running gdm
stop_display_manager_if_running lightdm
stop_display_manager_if_running lxdm
stop_display_manager_if_running xdm
stop_display_manager_if_running mdm
stop_display_manager_if_running display-manager

# Unbind VTconsoles if currently bound (adapted from https://www.kernel.org/doc/Documentation/fb/fbcon.txt)
if test -e "/tmp/vfio-bound-consoles" ; then
    rm -f /tmp/vfio-bound-consoles
fi
for (( i = 0; i < 16; i++))
do
  if test -x /sys/class/vtconsole/vtcon${i}; then
      if [ `cat /sys/class/vtconsole/vtcon${i}/name | grep -c "frame buffer"` \
           = 1 ]; then
	       echo 0 > /sys/class/vtconsole/vtcon${i}/bind
           echo "Unbinding console ${i}"
           echo $i >> /tmp/vfio-bound-consoles
      fi
  fi
done

# Unbind EFI-Framebuffer
if test -e "/tmp/vfio-is-nvidia" ; then
    rm -f /tmp/vfio-is-nvidia
fi

if lsmod | grep "nvidia" &> /dev/null || lsmod | grep "nouveau" &> /dev/null ; then
    echo "true" >> /tmp/vfio-is-nvidia
    echo efi-framebuffer.0 > /sys/bus/platform/drivers/efi-framebuffer/unbind
fi

echo "End of startup!"