Nixpkgs: services.mopidy.enable = true; fails

[mt-caret]

Issue description

When I try to enable mopidy, I get exactly the same error as https://github.com/NixOS/nixpkgs/issues/33932:

collision between `/nix/store/3d8nq34016rjz5vfy7w36k77nnrvkchk-gst-python-1.10.4/lib/python2.7/site-packages/gi/overrides/__init__.pyo' and `/nix/store/xir2hwxj8870j311hx8jdi63vcspljs0-python2.7-pygobject-3.24.1/lib/python2.7/site-packages/gi/overrides/__init__.pyo'

Is this a known issue?

Full error message:

$ sudo nixos-rebuild boot
building Nix...
warning: in configuration file '/etc/nix/nix.conf': unknown setting 'signed-binary-caches'
warning: in configuration file '/etc/nix/nix.conf': unknown setting 'signed-binary-caches'
building the system configuration...
warning: in configuration file '/etc/nix/nix.conf': unknown setting 'signed-binary-caches'
these derivations will be built:
  /nix/store/87vchvqv4misz0qxhh7fmxbwp3dihln0-system-path.drv
  /nix/store/08wzmf5v9387449kks199ar2x1j6jl3g-unit-polkit.service.drv
  /nix/store/2h60dd3whbfrsqv1vaklsn71mg93s4lj-dbus-1.drv
  /nix/store/ddsfxdccab6mv1bvxk25k8pf3pp6i2k9-unit-dbus.service.drv
  /nix/store/9ac0dynaq8cm8n8280wmph204fl87hff-user-units.drv
  /nix/store/flrd0spl6qqkssbvfknlrq40g5gccsjw-unit-systemd-fsck-.service.drv
  /nix/store/z32xpl22v64vhw91pcd3d7iyjl2hp1vb-python-2.7.14-env.drv
  /nix/store/lxmzpva4spmz3l4ny79r3lqcwirjsk1x-unit-mopidy-scan.service.drv
  /nix/store/z583bmd414jflbd33d440zgpkzpg44d2-unit-mopidy.service.drv
  /nix/store/hbyfiv3x1hq4gm7jdcsd77fhjwjmzjjf-system-units.drv
  /nix/store/p3jf9jjf8ws884cs20jk2h6ki2yg6zks-etc.drv
  /nix/store/2x07d2aqs981hvkd148wmssylw6wpqxm-nixos-system-dn-17.09.3109.48a76ca6f57.drv
building '/nix/store/87vchvqv4misz0qxhh7fmxbwp3dihln0-system-path.drv'...
building '/nix/store/z32xpl22v64vhw91pcd3d7iyjl2hp1vb-python-2.7.14-env.drv'...
collision between `/nix/store/3d8nq34016rjz5vfy7w36k77nnrvkchk-gst-python-1.10.4/lib/python2.7/site-packages/gi/overrides/__init__.pyo' and `/nix/store/xir2hwxj8870j311hx8jdi63vcspljs0-python2.7-pygobject-3.24.1/lib/python2.7/site-packages/gi/overrides/__init__.pyo'
builder for '/nix/store/z32xpl22v64vhw91pcd3d7iyjl2hp1vb-python-2.7.14-env.drv' failed with exit code 25
cannot build derivation '/nix/store/lxmzpva4spmz3l4ny79r3lqcwirjsk1x-unit-mopidy-scan.service.drv': 1 dependencies couldn't be built
cannot build derivation '/nix/store/z583bmd414jflbd33d440zgpkzpg44d2-unit-mopidy.service.drv': 1 dependencies couldn't be built
cannot build derivation '/nix/store/hbyfiv3x1hq4gm7jdcsd77fhjwjmzjjf-system-units.drv': 1 dependencies couldn't be built
cannot build derivation '/nix/store/p3jf9jjf8ws884cs20jk2h6ki2yg6zks-etc.drv': 1 dependencies couldn't be built
cannot build derivation '/nix/store/2x07d2aqs981hvkd148wmssylw6wpqxm-nixos-system-dn-17.09.3109.48a76ca6f57.drv': 1 dependencies couldn't be built
error: build of '/nix/store/2x07d2aqs981hvkd148wmssylw6wpqxm-nixos-system-dn-17.09.3109.48a76ca6f57.drv' failed

Steps to reproduce

AFAIK this triggers it:

{
  services.mopidy.enable = true;
}

But I can't rule out the possibility that something else is interfering with mopidy's build (is that even possible?).

Technical details

Please run nix-shell -p nix-info --run "nix-info -m" and paste the
results.

• system: "x86_64-linux"
• host os: Linux 4.9.82, NixOS, 17.09.3047.8bce347f02f (Hummingbird)
• multi-user?: yes
• sandbox: yes
• version: nix-env (Nix) 1.12pre5873_b76e282d
• channels(root): "nixos-17.09.3109.48a76ca6f57"
• channels(delta): "nixpkgs-18.03pre129212.098c7f3d945"
• nixpkgs: /nix/var/nix/profiles/per-user/root/channels/nixos/nixpkgs

[rnhmjoj]

It happens whenever gst-python and pygobject3 are exposed together. I could try backport it but I have to find how it was fixed in master first.

[mattfredwill]

I've gotten this working locally by creating a local copy of the mopidy service module from master, still using 17.09 packages, tested local files and spotify.

So it seems all that's necessary is 85b84527f636c60bd8c0f0567bb471d491fb5a89

[yegortimoshenko]

Closed via 2070830ba845b69c7c597537786d9b9498fa4b28.