[buildd-tools-devel] Bug#858899: sbuild: add null resolver

[Johannes Schauer]

Source: sbuild
Severity: wishlist

Add a resolver that does nothing. Lets call it null resolver. It is used
like so:

    --build-dep-resolver=null

The utility would be for situations in which sbuild is used as a package
builder but the user wants complete control over how dependencies are
installed.

For example, it is currently only possible to add build dependencies but
not to remove or change them unless one installs dummy binary packages
where necessary which is prone to failure. Instead, lets offer a
resolver that is actually doing nothing but lets the user control
dependency installation in the various hooks.