@mbbx6spp, thanks for your PR! By analyzing the history of the files in this pull request, we identified @offlinehacker, @rbvermaa, @edolstra and @FRidh to be potential reviewers.

Thanks. Could you put the docker_1_10.nix expression in pkgs/tools/networking/dd-agent/ and import it straight into the dd-agent expression? As long as there's no other applications that need that specific version I don't think we should make it public.

Thanks for the speedy review. @FRidh I kept the two commits format of the PR, both should still work as expected. I removed the older pythonPackages.docker_1_10 package from being public and embedded in the package lambda's let. Let me know if there are any other changes.

As a last sanity check I did the following:

1. I removed docker_1_10 from buildInputs list in the dd-agent package lambda.

$ dd-agent -h
Traceback (most recent call last):
  File "/nix/store/g4xqhraqc3q78yp2a639v6j9yrbjmpwh-dd-agent-5.11.2/bin/.dd-agent-wrapped", line 13, in <module>
    from config import get_version, initialize_logging  # noqa
  File "/nix/store/g4xqhraqc3q78yp2a639v6j9yrbjmpwh-dd-agent-5.11.2/agent/config.py", line 29, in <module>
    from utils.service_discovery.config import extract_agent_config
  File "/nix/store/g4xqhraqc3q78yp2a639v6j9yrbjmpwh-dd-agent-5.11.2/agent/utils/service_discovery/config.py", line 9, in <module>
    from utils.service_discovery.sd_backend import SD_BACKENDS
  File "/nix/store/g4xqhraqc3q78yp2a639v6j9yrbjmpwh-dd-agent-5.11.2/agent/utils/service_discovery/sd_backend.py", line 9, in <module>
    from utils.service_discovery.sd_docker_backend import SDDockerBackend
  File "/nix/store/g4xqhraqc3q78yp2a639v6j9yrbjmpwh-dd-agent-5.11.2/agent/utils/service_discovery/sd_docker_backend.py", line 10, in <module>
    from docker.errors import NullResource, NotFound
ImportError: No module named docker.errors
?=1 | Error

2. Added it back:

$ vim pkgs/tools/networking/dd-agent/default.nix
?=0 | OK

$ nix-env -f . -iA dd-agent
replacing old ‘dd-agent-5.11.2’
installing ‘dd-agent-5.11.2’
?=0 | OK

$ dd-agent -h
Please supply a configuration file at /etc/dd-agent/datadog.conf or in the directory where the Agent is currently deployed.
?=3 | Error

Thank you. I've pushed this to master. I made some minor changes in 35f9f63. While in Nixpkgs we typically pass in individual packages, in the case of Python we pass the whole package set in order to prevent any accidental mixing.

Any chance it can get backported to 17.03?

Done!