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Requirements -*- outline -*-
------------
* Allow a user to chroot() into a location specified in a configuration file.
This will require the program to be setuid-root.
* Allow the user to run a command or a login shell.
* Allow the user to preserve their environment inside the chroot.
This should not be the default.
* Restrict access to the chroot to certain users or groups.
Group restrictions are easiest to administer, and the default is to
create users with their own group anyway.
* Allow root access to non-root users.
root access is required in order to install and remove packages in
the root (i.e. general apt/dpkg stuff).
In order for tools like sbuild to run non-interactively, this should
be password-less if the user is authorised to have root access in
the chroot.
* Allow changing to other users, in addition to root, in the same manner as su(1).
This will require authentication.
* Allow querying of the available chroots.
Tools need to know the available chroots, and should not be required
to parse the configuration file by hand.
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