Spread out sitescript pulls to avoid hgweb bug

modules/sitescripts/manifests/init.pp

 class sitescripts (
     $sitescriptsini_source = undef
   ){
 
   concat {'/etc/sitescripts.ini':
     mode => 644,
     owner => root,
     group => root,
   }
 
   define configfragment($source = $title)
   {
     concat::fragment {$source:
       target => '/etc/sitescripts.ini',
       source => $source
     }
   }
 
   configfragment {$sitescriptsini_source: }
 
   exec { "fetch_sitescripts":
     command => "hg clone https://hg.adblockplus.org/sitescripts /opt/sitescripts",
     path => ["/usr/bin/", "/bin/"],
     require => Package['mercurial'],
     onlyif => "test ! -d /opt/sitescripts"
   }
 
   cron {"update_sitescripts":
     ensure => present,
-    command => "hg pull -q -u -R /opt/sitescripts",
+    # We spread out the pulls a little to avoid the following bug in hgweb:
+    # http://bz.selenic.com/show_bug.cgi?id=3953
+    command => "bash -c 'sleep $((RANDOM \% 20))'; hg pull -q -u -R /opt/sitescripts",
     environment => ['MAILTO=admins@adblockplus.org,root'],
     user => root,
     require => Exec["fetch_sitescripts"],
   }
 }