nfs is left to an inconsistent state when /etc/default/nfs-* parameters have options without quotes

When a space+option is left without quotes in NEED_IDMAPD it leaves nfs to an inconsistent state upon start.

Steps to reproduce
1. in /etc/default/nfs-common change NEED_IDMAPD= to
NEED_IDMAPD= yes
2. stop idmapd, start idmapd

This is probably caused by /etc/init/idmapd that runs the following code.
env DEFAULTFILE=/etc/default/nfs-common
 if [ -f "$DEFAULTFILE" ]; then
  . "$DEFAULTFILE"
 fi

In this case NEED_IDMAPD is empty which causes issues when starting the service.

PS: in my tests since /etc/init/idmapd.conf tries to source the variable NEED_IDMAPD= yes ( without quotes ), it also starts the following linux util /usr/bin/yes :-P

I know having spaces in variable assignment must not happen without quotes though we should find a way of enforcing or sanitize variables.

Leonardo

ProblemType: Bug
DistroRelease: Ubuntu 11.04
Package: nfs-common 1:1.2.2-4ubuntu5.1
Uname: Linux 2.6.39-020639rc4-generic i686
Architecture: i386
Date: Fri Oct 28 15:33:08 2011
InstallationMedia: Ubuntu 11.04 "Natty Narwhal" - Release i386 (20110426)
ProcEnviron:
 LANGUAGE=en_CA:en
 LANG=en_CA.UTF-8
 SHELL=/bin/bash
SourcePackage: nfs-utils
UpgradeStatus: No upgrade log present (probably fresh install)