Code review comment for lp:~james-page/nova/fix-lxc-and-primary-group

A couple thoughts on this
 - I was initially confused about $(groups | awk '{print 3}) , as '3' seemed strange. groups does seem to output the primary group of a user as the first field, but I think that 'id -gn <user>' more explicitly requests that. I will admit to wishing the documentation for 'id' said "primary group" rather than just "effective group", but I looked at source and it does: 'rgid = egid = pwd->pw_gid;'.
    I know this is nitpick.

 - I'm concerned about the '-mount' argument to 'find'.
   If the user has done something like:
   mount --bind /some/large/filesystem /var/lib/nova/instances
   or even:
   mount /dev/sdb1 /var/lib/nova/instances

   I think that we'd avoid changing ownership of those files. I don't know how serious this is.
   One quick fix I had would be to do this:
   # change ownership of files under /var/lib/nova/ except rootfs (LP: #861260)
   find /var/lib/nova/ -name 'rootfs' -prune -o -exec chown nova:nova {} \;