nixpkgs/pkgs/tools/system/fcron/default.nix

# restart using 'killall -TERM fcron; fcron -b
# use convert-fcrontab to update fcrontab files

{ stdenv, fetchurl, perl, busybox, vim }:

stdenv.mkDerivation rec {
  pname = "fcron";
  version = "3.3.0";

  src = fetchurl {
    url = "http://fcron.free.fr/archives/${pname}-${version}.src.tar.gz";
    sha256 = "0q5b1fdq1rpsd4lj7v717x47pmn62hhm13394g0yxqi614xd7sls";
  };

  buildInputs = [ perl ];

  patches = [ ./relative-fcronsighup.patch ];

  configureFlags =
    [ "--with-sendmail=${busybox}/sbin/sendmail"
      "--with-editor=${vim}/bin/vi"  # TODO customizable
      "--with-bootinstall=no"
      "--localstatedir=/var"
      "--sysconfdir=/etc"
      "--with-rootname=root"
      "--with-rootgroup=root"
      "--disable-checks"
    ];

  installTargets = [ "install-staged" ]; # install does also try to change permissions of /etc/* files

  # fcron tries to install pid into system directory on install
  installFlags = [
    "ETC=."
    "PIDDIR=."
    "PIDFILE=fcron.pid"
    "REBOOT_LOCK=fcron.reboot"
    "FIFODIR=."
    "FIFOFILE=fcron.fifo"
    "FCRONTABS=."
  ];

  preConfigure = ''
    sed -i 's@/usr/bin/env perl@${perl}/bin/perl@g' configure script/*
    # Don't let fcron create the group fcron, nix(os) should do this
    sed -i '2s@.*@exit 0@' script/user-group

    # --with-bootinstall=no shoud do this, didn't work. So just exit the script before doing anything
    sed -i '2s@.*@exit 0@' script/boot-install

    # also don't use chown or chgrp for documentation (or whatever) when installing
    find -type f | xargs sed -i -e 's@^\(\s\)*chown@\1:@' -e 's@^\(\s\)*chgrp@\1:@'
  '';

  meta = with stdenv.lib; {
    description="A command scheduler with extended capabilities over cron and anacron";
    homepage = http://fcron.free.fr;
    license = licenses.gpl2;
    platforms = stdenv.lib.platforms.all;
  };
}