dockerTools: add an onTopOfPulledImage example

This allows to test if a pulled image can be updated by using our
Docker tools.

1 files changed, 8 insertions, 0 deletions

diff --git a/pkgs/build-support/docker/examples.nix b/pkgs/build-support/docker/examples.nix
index 691d4bb74db..315440349b6 100644
--- a/pkgs/build-support/docker/examples.nix
+++ b/pkgs/build-support/docker/examples.nix
@@ -116,4 +116,12 @@ rec {
       Env = [ "NIX_PAGER=cat" ];
     };
   };
+
+  # 7. example of adding something on top of an image pull by our
+  # dockerTools chain.
+  onTopOfPulledImage = buildImage {
+    name = "onTopOfPulledImage";
+    fromImage = nixFromDockerHub;
+    contents = [ pkgs.hello ];
+  };
 }