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nixos/tests/docker-tools: check layer sharing with buildLayeredImage

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Adapted from grahamc's blog post on layered Docker images in Nix:

https://grahamc.com/blog/nix-and-layered-docker-images
This commit is contained in:
Daniël de Kok 2019-06-06 10:39:50 +02:00
parent 7e6756af41
commit 3b0d5b5ed3
2 changed files with 14 additions and 0 deletions
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6
nixos/tests/docker-tools.nix
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@ -68,6 +68,12 @@ import ./make-test.nix ({ pkgs, ... }: {
$docker->succeed("docker load --input='${pkgs.dockerTools.examples.layered-on-top}'");
$docker->succeed("docker run --rm ${pkgs.dockerTools.examples.layered-on-top.imageName}");
# Ensure layers are shared between images
$docker->succeed("docker load --input='${pkgs.dockerTools.examples.another-layered-image}'");
$docker->succeed("docker inspect ${pkgs.dockerTools.examples.layered-image.imageName} | ${pkgs.jq}/bin/jq -r '.[] | .RootFS.Layers | .[]' | sort > layers1.sha256");
$docker->succeed("docker inspect ${pkgs.dockerTools.examples.another-layered-image.imageName} | ${pkgs.jq}/bin/jq -r '.[] | .RootFS.Layers | .[]' | sort > layers2.sha256");
$docker->succeed('[ $(comm -1 -2 layers1.sha256 layers2.sha256 | wc -l) -ne 0 ]');
# Ensure order of layers is correct
$docker->succeed("docker load --input='${pkgs.dockerTools.examples.layersOrder}'");
$docker->succeed("docker run --rm ${pkgs.dockerTools.examples.layersOrder.imageName} cat /tmp/layer1 | grep -q layer1");

8
pkgs/build-support/docker/examples.nix
View File

@ -226,4 +226,12 @@ rec {
'';
};
# 14. Create another layered image, for comparing layers with image 10.
another-layered-image = pkgs.dockerTools.buildLayeredImage {
name = "another-layered-image";
tag = "latest";
config.Cmd = [ "${pkgs.hello}/bin/hello" ];
contents = [ pkgs.hello ];
};
}