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dockerTools.buildLayeredImage: fix image with only 2 layers

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A test is also added to ensure an image with 2 layers can be built.
This commit is contained in:
Antoine Eiche 2020-01-30 10:42:13 +01:00
parent 8539d5f48f
commit 283bcc1003
3 changed files with 14 additions and 2 deletions
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3
nixos/tests/docker-tools.nix
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@ -80,5 +80,8 @@ import ./make-test.nix ({ pkgs, ... }: {
# 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");
# Ensure image with only 2 layers can be loaded
$docker->succeed("docker load --input='${pkgs.dockerTools.examples.two-layered-image}'");
'';
})

5
pkgs/build-support/docker/default.nix
View File

@ -315,7 +315,7 @@ rec {
runCommand "${name}-granular-docker-layers" {
inherit maxLayers;
paths = referencesByPopularity overallClosure;
nativeBuildInputs = [ jshon rsync tarsum ];
nativeBuildInputs = [ jshon rsync tarsum moreutils ];
enableParallelBuilding = true;
}
''
@ -335,7 +335,8 @@ rec {
cat $paths ${lib.concatMapStringsSep " " (path: "| grep -v ${path}") (closures ++ [ overallClosure ])}
}
paths | head -n $((maxLayers - 1)) | cat -n | xargs -P$NIX_BUILD_CORES -n2 ${storePathToLayer}
# We need to sponge to avoid grep broken pipe error when maxLayers == 1
paths | sponge | head -n $((maxLayers - 1)) | cat -n | xargs -r -P$NIX_BUILD_CORES -n2 ${storePathToLayer}
if [ $(paths | wc -l) -ge $maxLayers ]; then
paths | tail -n+$maxLayers | xargs ${storePathToLayer} $maxLayers
fi

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

@ -238,4 +238,12 @@ rec {
config.Cmd = [ "${pkgs.hello}/bin/hello" ];
};
# 15. Create a layered image with only 2 layers
two-layered-image = pkgs.dockerTools.buildLayeredImage {
name = "two-layered-image";
tag = "latest";
config.Cmd = [ "${pkgs.hello}/bin/hello" ];
contents = [ pkgs.bash pkgs.hello ];
maxLayers = 2;
};
}