[Pkg-utopia-maintainers] Bug#555712: upower and encrypted swap

[Erich Schubert]

Hi,
I'm also affected by this. I can hibernate to my encrypted swap just
fine - but it took me quite some time to find out why Gnome doesn't give
me the option to do so.
After some digging I found out that apparently this is an extra check
done by upower; indeed there are encrypted-swap setups where it will not
work properly.

I don't think there is a completely reliable test on whether encrypted
swap will be working or not. HOWEVER, the common way of setting up an
hibernation-compatible encrypted swap is using the option
  keyscript=/lib/cryptsetup/scripts/decrypt_derived
in /etc/crypttab. So extending dkp_daemon_check_encrypted_swap to accept
swap devices that use decrypt_derived in /etc/crypttab sounds like a
good approach to me. I'd just check for "decrypt_derived", so the user
could also use /sbin/custom-decrypt-derived.
That should be fairly easy to add to dkp_daemon_check_encrypted_swap.

Regards,
Erich