#!/usr/bin/perl -w

use strict;

my $command = shift @ARGV;
my $perl = shift @ARGV;
my $syncfile = shift @ARGV;

if ($command eq 'start') {
  if ($syncfile) {
    # sleep until it disappears, or times out
    while (-f $syncfile && mtime_age_secs($syncfile) < 60*60) {
      print "$syncfile exists with age ".mtime_age_secs($syncfile).", sleeping\n";
      sleep 60*3 + rand(60*5);
    }

    open (TOUCH, ">$syncfile"); close TOUCH;
  }

  system ("$perl Makefile.PL < /dev/null");
  system ("make distclean");
  system ("rm -rf Mail-SpamAssassin*");
}
elsif ($command eq 'stop') {
  if ($syncfile) {
    unlink ($syncfile);
    print "$syncfile removed\n";
  }
}
exit;

sub mtime_age_secs {
  my $f = shift;
  my @s = stat($f);
  return (time - $s[9]);
}