Bug#892174: apt-get source -t fails if target release doesn't have deb sources.list entry

["Adam D. Barratt" <adam@adam-barratt.org.uk>]

Control: forcemerge 441178 -1

On 2018-03-06 12:24, Harald Sitter wrote:
> Package: apt
> Version: 1.2.25
>
> simple example in a docker container `docker run -it --rm ubuntu:bionic 
> bash`
>
> ```
> echo 'deb-src http://archive.ubuntu.com/ubuntu xenial main' >
> /etc/apt/sources.list.d/xenial.list
> apt update
> apt-get source -t xenial apt
> ```
>
> Will fail because the xenial release has no `deb ...` sources.list
> entry and the pkgPolicy code checking -t is valid only iterates the
> package cache it seems. Adding a suitable deb entry makes this work.

This sounds very much like #441178; merging.

Regards,

Adam