gistfile1.txt

[root@amd-nixos:~]# cat /etc/systemd/system/display-manager.service
Environment="SLIM_CFGFILE=/nix/store/261pxy8zkfd3yqm50daqninsv32k0npm-slim.cfg"
ExecStart=/nix/store/bdrgyna6p8crcmz20ajnn05zx7iirv1c-unit-script-display-manager-start

# this tells systemd how to launch slim

[root@amd-nixos:~]# cat /nix/store/261pxy8zkfd3yqm50daqninsv32k0npm-slim.cfg
sessiondir /nix/store/lxrwmamv5701ksm1hdk5b68nrvy3lbhl-desktops/share/xsessions
login_cmd exec /nix/store/l6h4ya0wzb4b8mr0y58k2gh2nhfql4sn-bash-4.4-p23/bin/bash /nix/store/jqiab84xhiz0dpwagsbmnnf4y4wahm5v-xsession-wrapper "%session"

# this tells slim what to run after login, and where the list of available sessions is

[root@amd-nixos:~]# ls /nix/store/lxrwmamv5701ksm1hdk5b68nrvy3lbhl-desktops/share/xsessions -l
total 5
-r--r--r-- 1 root root 187 Dec 31  1969 xfce.desktop
[root@amd-nixos:~]# cat /nix/store/jqiab84xhiz0dpwagsbmnnf4y4wahm5v-xsession-wrapper
if test "$1"; then
    # Run the supplied session command. Remove any double quotes with eval.
    eval exec "$@"
else
    # Fall back to the default window/desktopManager
    exec /nix/store/ds7zlfkbs87q24paa64w1skmn4h2m31y-xsession
fi

# this then runs the default `xsession`

[root@amd-nixos:~]# cat  /nix/store/ds7zlfkbs87q24paa64w1skmn4h2m31y-xsession
# Start the desktop manager.
case "$desktopManager" in
  (none)
  if [ -e $HOME/.background-image ]; then
  /nix/store/nfc4b2sf2n9cwpx91cl5nby1jzgdjywq-feh-3.2.1/bin/feh --bg-scale  $HOME/.background-image
else
  # Use a solid black background as fallback
  /nix/store/xkz770lmfyqhrq9c1pqmddk8hkp87y54-xsetroot-1.1.2/bin/xsetroot -solid black
fi

  ;;
(xfce)
  

/nix/store/l6h4ya0wzb4b8mr0y58k2gh2nhfql4sn-bash-4.4-p23/bin/bash /nix/store/s6lf4k2x6jyvxv4yrsjwbdnlkcnadnfq-xfce4-session-4.12.1/etc/xdg/xfce4/xinitrc &
waitPID=$!

  ;;

  (*) echo "$0: Desktop manager '$desktopManager' not found.";;
esac

# which runs xfce