[20.03] firefox syncserver fails to build

[mweinelt]

Describe the bug
The firefox syncserver fails to build in 20.03 because the webtest python2 package has been disabled in 4ba99e2.

There are no upstream efforts for a python3 migration, but instead for a rust port. That does not seem to be ready for prime time yet, according to a pessimistic comment here: mozilla-services/syncserver#165 (comment).

❯ nix run nixpkgs.syncserver --show-trace | wl-copy -p
error: while evaluating the attribute 'drvPath' at /nix/store/wf594qcm5h1gyj3fdw971rw8r3ncphd4-nixos-20.09pre214664.d363be93b49/nixos/lib/customisation.nix:158:7:
while evaluating the attribute 'propagatedBuildInputs' of the derivation 'python2.7-syncserver-1.8.0' at /nix/store/wf594qcm5h1gyj3fdw971rw8r3ncphd4-nixos-20.09pre214664.d363be93b49/nixos/pkgs/development/interpreters/python/mk-python-derivation.nix:105:3:
while evaluating the attribute 'out.outPath' at /nix/store/wf594qcm5h1gyj3fdw971rw8r3ncphd4-nixos-20.09pre214664.d363be93b49/nixos/lib/customisation.nix:151:13:
while evaluating the attribute 'propagatedBuildInputs' of the derivation 'python2.7-cornice-0.17' at /nix/store/wf594qcm5h1gyj3fdw971rw8r3ncphd4-nixos-20.09pre214664.d363be93b49/nixos/pkgs/development/interpreters/python/mk-python-derivation.nix:105:3:
while evaluating the attribute 'out.outPath' at /nix/store/wf594qcm5h1gyj3fdw971rw8r3ncphd4-nixos-20.09pre214664.d363be93b49/nixos/lib/customisation.nix:151:13:
while evaluating the attribute 'nativeBuildInputs' of the derivation 'python2.7-pyramid-1.10.4' at /nix/store/wf594qcm5h1gyj3fdw971rw8r3ncphd4-nixos-20.09pre214664.d363be93b49/nixos/pkgs/development/interpreters/python/mk-python-derivation.nix:105:3:
while evaluating 'getOutput' at /nix/store/wf594qcm5h1gyj3fdw971rw8r3ncphd4-nixos-20.09pre214664.d363be93b49/nixos/lib/attrsets.nix:464:23, called from undefined position:
while evaluating 'callPackageWith' at /nix/store/wf594qcm5h1gyj3fdw971rw8r3ncphd4-nixos-20.09pre214664.d363be93b49/nixos/lib/customisation.nix:117:35, called from /nix/store/wf594qcm5h1gyj3fdw971rw8r3ncphd4-nixos-20.09pre214664.d363be93b49/nixos/pkgs/top-level/python-packages.nix:6181:13:
while evaluating 'makeOverridable' at /nix/store/wf594qcm5h1gyj3fdw971rw8r3ncphd4-nixos-20.09pre214664.d363be93b49/nixos/lib/customisation.nix:67:24, called from /nix/store/wf594qcm5h1gyj3fdw971rw8r3ncphd4-nixos-20.09pre214664.d363be93b49/nixos/lib/customisation.nix:121:8:
while evaluating anonymous function at /nix/store/wf594qcm5h1gyj3fdw971rw8r3ncphd4-nixos-20.09pre214664.d363be93b49/nixos/pkgs/development/python-modules/webtest/default.nix:1:1, called from /nix/store/wf594qcm5h1gyj3fdw971rw8r3ncphd4-nixos-20.09pre214664.d363be93b49/nixos/lib/customisation.nix:69:16:
while evaluating 'makeOverridablePythonPackage' at /nix/store/wf594qcm5h1gyj3fdw971rw8r3ncphd4-nixos-20.09pre214664.d363be93b49/nixos/pkgs/top-level/python-packages.nix:31:37, called from /nix/store/wf594qcm5h1gyj3fdw971rw8r3ncphd4-nixos-20.09pre214664.d363be93b49/nixos/pkgs/development/python-modules/webtest/default.nix:16:1:
while evaluating 'makeOverridable' at /nix/store/wf594qcm5h1gyj3fdw971rw8r3ncphd4-nixos-20.09pre214664.d363be93b49/nixos/lib/customisation.nix:67:24, called from /nix/store/wf594qcm5h1gyj3fdw971rw8r3ncphd4-nixos-20.09pre214664.d363be93b49/nixos/pkgs/top-level/python-packages.nix:33:12:
while evaluating anonymous function at /nix/store/wf594qcm5h1gyj3fdw971rw8r3ncphd4-nixos-20.09pre214664.d363be93b49/nixos/pkgs/development/interpreters/python/mk-python-derivation.nix:28:1, called from /nix/store/wf594qcm5h1gyj3fdw971rw8r3ncphd4-nixos-20.09pre214664.d363be93b49/nixos/lib/customisation.nix:69:16:
webtest-2.0.32 not supported for interpreter python2.7

To Reproduce
Steps to reproduce the behavior:

1. Configure services.firefox.syncserver on 20.03

Metadata

nixpkgs
  homepage: https://github.com/NixOS/nixpkgs
  url: https://github.com/NixOS/nixpkgs/archive/1f33b3d0188634e6c198e99b387107d53dcb36f9.tar.gz
  owner: NixOS
  branch: release-20.03
  url_template: https://github.com/<owner>/<repo>/archive/<rev>.tar.gz
  repo: nixpkgs
  type: tarball
  sha256: 0szwvmlil50g8yys0bcc1nh2q8zcfni0p25gabig2ppkjcwvkjq7
  description: A read-only mirror of NixOS/nixpkgs tracking the released channels. Send issues and PRs to

Maintainer information:

# a list of nixpkgs attributes affected by the problem
attribute: syncserver
# a list of nixos modules affected by the problem
module: firefox.syncserver

@Nadrieril @andir

[Nadrieril]

Yes we're about to discontinue the module and package for that exact reason sadly #74725

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