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nixpkgs/pkgs/build-support/docker
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Graham Christensen a32d7e0c74 dockerTools.buildImage: support impure dates 
Because dates are an impurity, by default buildImage will use a static
date of one second past the UNIX Epoch. This can be a bit frustrating
when listing docker images in the CLI:

    $ docker image list
    REPOSITORY   TAG      IMAGE ID       CREATED        SIZE
    hello        latest   08c791c7846e   48 years ago   25.2MB

If you want to trade the purity for a better user experience, you can
set created to now.

    pkgs.dockerTools.buildImage {
      name = "hello";
      tag = "latest";
      created = "now";
      contents = pkgs.hello;

      config.Cmd = [ "/bin/hello" ];
    }

and now the Docker CLI will display a reasonable date and sort the
images as expected:

    $ docker image list
    REPOSITORY   TAG      IMAGE ID       CREATED              SIZE
    hello        latest   de2bf4786de6   About a minute ago   25.2MB
2018-09-20 18:26:02 +02:00
..
default.nix dockerTools.buildImage: support impure dates 2018-09-20 18:26:02 +02:00
detjson.py dockerTools: private registry support 2016-01-27 21:13:07 +00:00
examples.nix dockerTools.examples: explicitly set image tag to fix docker-tools tests 2018-07-06 16:38:42 +02:00
tarsum.go dockerTools.tarsum: Fix upstream import 2018-03-26 18:47:31 +02:00