zfs-fuse has a packaging bug, Fedora packaging guidelines explicitly
mention that services are not started in %post, exactly b/c
installation might be in chroot:
http://fedoraproject.org/wiki/Packaging:SysVInitScript#Why_don.27t_we....
http://fedoraproject.org/wiki/Packaging:Systemd#Why_don.27t_we....
Alan