install needs a --package-conf=FILE flag

[guest]

It's not possible to use a non-standard package configuration file while installing at the moment. It would be very convenient to have.

[duncan]

Have we broken the --package-db= flag? If so we should fix it.

[duncan]

The --package-db= flag does appear to work, closing.

Before the Cabal-1.6.0.2 release I did two independent builds of everything on Hackage (well, at least everything that can consistently be installed simultaneously) using isolated prefixes and package dbs. It even works doing both builds simultaneously (after fixing how temp dirs are selected and where log files go).