Comment 16 for bug 643289

I don't see the point of checking whether NEED_IDMAPD=yes is in /etc/default/nfs-common. The "script" block is only going to run when the pre-script determines that idmapd should be started. (Even if you did need to check NEED_IDMAPD, you'd want to read it out of the environment rather than grepping the defaults file.)

It looks like your proposed solution boils down to copying what the rpc_pipefs upstart job does into the idmapd job. This seems like a possible workaround, but definitely not a fix.