nixpkgs/upstart-jobs/maintenance-shell.nix

{bash}:

{
  name = "maintenance-shell";
  
  job = "
start on maintenance
start on stalled

script
    exec < /dev/tty1 > /dev/tty1 2>&1
    echo \"\"
    echo \"<<< MAINTENANCE SHELL >>>\"
    echo \"\"
    exec ${bash}/bin/sh
end script
  ";
  
}