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Docker images used to be, essentially, a linked list of layers. Each
layer would have a tarball and a json document pointing to its parent,
and the image pointed to the top layer:
imageA ----> layerA
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v
layerB
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v
layerC
The current image spec changed this format to where the Image defined
the order and set of layers:
imageA ---> layerA
|--> layerB
`--> layerC
For backwards compatibility, docker produces images which follow both
specs: layers point to parents, and images also point to the entire
list:
imageA ---> layerA
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| v
|--> layerB
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`--> layerC
This is nice for tooling which supported the older version and never
updated to support the newer format.
Our `buildImage` code only supported the old version, so in order for
`buildImage` to properly generate an image based on another image
with `fromImage`, the parent image's layers must fully support the old
mechanism.
This is not a problem in general, but is a problem with
`buildLayeredImage`.
`buildLayeredImage` creates images with newer image spec, because
individual store paths don't have a guaranteed parent layer. Including
a specific parent ID in the layer's json makes the output less likely
to cache hit when published or pulled.
This means until now, `buildLayeredImage` could not be the input to
`buildImage`.
The changes in this PR change `buildImage` to only use the layer's
manifest when locating parent IDs. This does break buildImage on
extremely old Docker images, though I do wonder how many of these
exist.
This work has been sponsored by Target.
71 lines
3.4 KiB
Nix
71 lines
3.4 KiB
Nix
# this test creates a simple GNU image with docker tools and sees if it executes
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import ./make-test.nix ({ pkgs, ... }: {
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name = "docker-tools";
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meta = with pkgs.stdenv.lib.maintainers; {
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maintainers = [ lnl7 ];
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};
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nodes = {
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docker =
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{ ... }: {
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virtualisation = {
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diskSize = 2048;
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docker.enable = true;
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};
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};
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};
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testScript =
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''
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$docker->waitForUnit("sockets.target");
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# Ensure Docker images use a stable date by default
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$docker->succeed("docker load --input='${pkgs.dockerTools.examples.bash}'");
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$docker->succeed("[ '1970-01-01T00:00:01Z' = \"\$(docker inspect ${pkgs.dockerTools.examples.bash.imageName} | ${pkgs.jq}/bin/jq -r .[].Created)\" ]");
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$docker->succeed("docker run --rm ${pkgs.dockerTools.examples.bash.imageName} bash --version");
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$docker->succeed("docker rmi ${pkgs.dockerTools.examples.bash.imageName}");
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# Check if the nix store is correctly initialized by listing dependencies of the installed Nix binary
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$docker->succeed("docker load --input='${pkgs.dockerTools.examples.nix}'");
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$docker->succeed("docker run --rm ${pkgs.dockerTools.examples.nix.imageName} nix-store -qR ${pkgs.nix}");
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$docker->succeed("docker rmi ${pkgs.dockerTools.examples.nix.imageName}");
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# To test the pullImage tool
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$docker->succeed("docker load --input='${pkgs.dockerTools.examples.nixFromDockerHub}'");
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$docker->succeed("docker run --rm nixos/nix:1.11 nix-store --version");
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$docker->succeed("docker rmi nixos/nix:1.11");
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# To test runAsRoot and entry point
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$docker->succeed("docker load --input='${pkgs.dockerTools.examples.nginx}'");
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$docker->succeed("docker run --name nginx -d -p 8000:80 ${pkgs.dockerTools.examples.nginx.imageName}");
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$docker->waitUntilSucceeds('curl http://localhost:8000/');
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$docker->succeed("docker rm --force nginx");
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$docker->succeed("docker rmi '${pkgs.dockerTools.examples.nginx.imageName}'");
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# An pulled image can be used as base image
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$docker->succeed("docker load --input='${pkgs.dockerTools.examples.onTopOfPulledImage}'");
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$docker->succeed("docker run --rm ontopofpulledimage hello");
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$docker->succeed("docker rmi ontopofpulledimage");
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# Regression test for issue #34779
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$docker->succeed("docker load --input='${pkgs.dockerTools.examples.runAsRootExtraCommands}'");
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$docker->succeed("docker run --rm runasrootextracommands cat extraCommands");
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$docker->succeed("docker run --rm runasrootextracommands cat runAsRoot");
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$docker->succeed("docker rmi '${pkgs.dockerTools.examples.runAsRootExtraCommands.imageName}'");
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# Ensure Docker images can use an unstable date
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$docker->succeed("docker load --input='${pkgs.dockerTools.examples.bash}'");
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$docker->succeed("[ '1970-01-01T00:00:01Z' != \"\$(docker inspect ${pkgs.dockerTools.examples.unstableDate.imageName} | ${pkgs.jq}/bin/jq -r .[].Created)\" ]");
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# Ensure Layered Docker images work
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$docker->succeed("docker load --input='${pkgs.dockerTools.examples.layered-image}'");
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$docker->succeed("docker run --rm ${pkgs.dockerTools.examples.layered-image.imageName}");
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# Ensure building an image on top of a layered Docker images work
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$docker->succeed("docker load --input='${pkgs.dockerTools.examples.layered-on-top}'");
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$docker->succeed("docker run --rm ${pkgs.dockerTools.examples.layered-on-top.imageName}");
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'';
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})
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