Yes, the current scheme is probably good for easy buildbot cleanup.


> Maybe we can blacklist some filesystems to choose the temporary directory.

If that's easily possible, it would be a good solution at least
for ecryptfs.


I've removed ecryptfs from my setup, since speedwise it's not
production-ready for encrypting an entire home directory.


The Ubuntu setup is a bit of a trap, since the encryption is
completely transparent to the user (i.e. mounting ecryptfs
occurs automatically on login).

So if you install Ubuntu as the first system on new hardware
and choose the ecryptfs option, after a while you forget about
ecryptfs entirely and blame any slowness on the hardware or
the software.