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nixos/tests/docker-tools: verify order of layers in stacked images

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This commit is contained in:
Antoine Eiche 2019-04-30 00:46:00 +02:00
parent a7eef11bb4
commit 5ef1223f30
2 changed files with 46 additions and 0 deletions
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7
nixos/tests/docker-tools.nix
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@ -67,5 +67,12 @@ import ./make-test.nix ({ pkgs, ... }: {
# Ensure building an image on top of a layered Docker images work # Ensure building an image on top of a layered Docker images work
$docker->succeed("docker load --input='${pkgs.dockerTools.examples.layered-on-top}'"); $docker->succeed("docker load --input='${pkgs.dockerTools.examples.layered-on-top}'");
$docker->succeed("docker run --rm ${pkgs.dockerTools.examples.layered-on-top.imageName}"); $docker->succeed("docker run --rm ${pkgs.dockerTools.examples.layered-on-top.imageName}");
# 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");
# This is to be sure the order of layers of the parent image is preserved
$docker->succeed("docker run --rm ${pkgs.dockerTools.examples.layersOrder.imageName} cat /tmp/layer2 | grep -q layer2");
$docker->succeed("docker run --rm ${pkgs.dockerTools.examples.layersOrder.imageName} cat /tmp/layer3 | grep -q layer3");
''; '';
}) })

39
pkgs/build-support/docker/examples.nix
View File

@ -187,4 +187,43 @@ rec {
runAsRoot = "touch /example-file"; runAsRoot = "touch /example-file";
fromImage = bash; fromImage = bash;
}; };
# 13. example of 3 layers images This image is used to verify the
# order of layers is correct.
# It allows to validate
# - the layer of parent are below
# - the order of parent layer is preserved at image build time
# (this is why there are 3 images)
layersOrder = let
l1 = pkgs.dockerTools.buildImage {
name = "l1";
tag = "latest";
extraCommands = ''
mkdir -p tmp
echo layer1 > tmp/layer1
echo layer1 > tmp/layer2
echo layer1 > tmp/layer3
'';
};
l2 = pkgs.dockerTools.buildImage {
name = "l2";
fromImage = l1;
tag = "latest";
extraCommands = ''
mkdir -p tmp
echo layer2 > tmp/layer2
echo layer2 > tmp/layer3
'';
};
in pkgs.dockerTools.buildImage {
name = "l3";
fromImage = l2;
tag = "latest";
contents = [ pkgs.coreutils ];
extraCommands = ''
mkdir -p tmp
echo layer3 > tmp/layer3
'';
};
} }