Code review comment for lp:~semiosis/livecd-rootfs/fix-for-1565985

> One thought: could we restore u to the hashbang and then just wrap the
> offending line in `set +u; ...; set -u`?

The offending line in clean_loops is in the functions file. If we have to change that, wouldn't it be better to use ${var-} instead of ${var} like I mentioned earlier? That seems closer to the intention of the code, which wants to know if a variable contains a path or not.

http://bazaar.launchpad.net/~ubuntu-core-dev/livecd-rootfs/trunk/view/head:/live-build/ubuntu-cpc/functions#L15

I may not be catching your suggestion, since I'm not a bash expert. If the above isn't the offending line you have in mind then please help me understand better.