{ stdenv
, pkgs
}:
{ name
, user
, binDir

, dependsOn ? {}
}:

{
  inherit name;
  pkg =
    { db
    , config
    }:
    stdenv.mkDerivation {
      name = "dbupgrade";

      src = pkgs.writeTextDir "wrapper" ''
      #!/bin/bash -e

      sudo -u ${user} bash <<HERE
      case "$1" in
        activate)
          ${pkgs.php}/bin/php ${binDir}/update.php --update-schema=force-yes
          ;;
        lock)
            if [ -f /tmp/wrapper.lock ]
            then
                exit 1
            else
                echo "1" > /tmp/wrapper.lock
            fi
            ;;
        unlock)
            rm -f /tmp/wrapper.lock
            ;;
      esac
      HERE
      '';

      installPhase = ''
      mkdir -p $out/bin
      cp $src/wrapper $out/bin
      chmod +x $out/bin/*
      '';
    };

  inherit dependsOn;
  type = "wrapper";
}