fetchdocker: Integration test exercising hocker and fetchdocker

This change adds a simple integration test exercising the fetchdocker
Nix code and hocker utilities for the simple `hello-world` docker
container. We exercise:

- Fetching the docker image configuration json
- Fetching the docker image layers
- Building a compositor script
- Loading the `hello-world` docker image into docker using the
  compositor script and `docker load`
- Running that loaded container

1 files changed, 19 insertions, 0 deletions

diff --git a/nixos/tests/hocker-fetchdocker/hello-world-container.nix b/nixos/tests/hocker-fetchdocker/hello-world-container.nix
new file mode 100644
index 00000000000..a127875264e
--- /dev/null
+++ b/nixos/tests/hocker-fetchdocker/hello-world-container.nix
@@ -0,0 +1,19 @@
+{ fetchDockerConfig, fetchDockerLayer, fetchdocker }:
+fetchdocker rec {
+    name = "hello-world";
+    registry = "https://registry-1.docker.io/v2/";
+    repository = "library";
+    imageName = "hello-world";
+    tag = "latest";
+    imageConfig = fetchDockerConfig {
+      inherit tag registry repository imageName;
+      sha256 = "1ivbd23hyindkahzfw4kahgzi6ibzz2ablmgsz6340vc6qr1gagj";
+    };
+    imageLayers = let
+      layer0 = fetchDockerLayer {
+        inherit registry repository imageName;
+        layerDigest = "ca4f61b1923c10e9eb81228bd46bee1dfba02b9c7dac1844527a734752688ede";
+        sha256 = "1plfd194fwvsa921ib3xkhms1yqxxrmx92r2h7myj41wjaqn2kya";
+      };
+      in [ layer0 ];
+  }