If a local repository path is given as a mirror URL lets bind it into the
chroot. The local repository will be unmounted while processing "remove" or
latest by the exit function.
It is important for derivatives that the bootstrap cache is setup completely,
it is re-used in several places and thus cannot consist of the parent
distribution only.
Until there's a supportable way to bootstrap from multiple archives at the same time
(and multistrap doesn't work for that as discussed in the past), we're going to run
a lot of duplicated code here to massage the apt sources for the time being.
Daniel Baumann
Jan Blunck
Kiel Christofferson