Closes#2092
On testing and unstable systems, /etc/os-release does not contain
VERSION_ID. In this case, lsb_release will report the release as
"n/a".
For unstable, this means that backports can be enabled in development
mode. When this happens, trixie-backports will be added as an apt
repository. The repository already exists, so it does not cause any
problem.
Tests:
- In stable container, backports can be enabled.
- In stable container, dist-upgrade can be disable and enabled.
- In stable container, in development mode, dist-upgrade can be
started.
- In testing container, backports cannot be enabled.
- In testing container, dist-upgrade cannot be enabled or started.
- In testing container, in development mode, backports can be enabled.
- In testing container, in development mode, dist-upgrade cannot be
started.
- In unstable container, in development mode, backports can be enabled
(as trixie-backports).
- In unstable container, in development mode, dist-upgrade cannot be
started.
Signed-off-by: James Valleroy <jvalleroy@mailbox.org>
[sunil: Merge the case of outdated unstable distributions that return 'unstable'
as release and newer unstable distributions that return 'n/a']
Signed-off-by: Sunil Mohan Adapa <sunil@medhas.org>
Reviewed-by: Sunil Mohan Adapa <sunil@medhas.org>
dceee56684