Create a set of Dart dockerfiles

runtime/Dockerfile

Index: runtime/Dockerfile
diff --git a/runtime/Dockerfile b/runtime/Dockerfile
new file mode 100644
index 0000000000000000000000000000000000000000..89b9175b5260ec3e0acc9dc10c99d117162c6aa7
--- /dev/null
+++ b/runtime/Dockerfile
@@ -0,0 +1,13 @@
+FROM google/dart
+
+WORKDIR /app
+ONBUILD ADD pubspec.yaml /app/
+ONBUILD ADD pubspec.lock /app/
+ONBUILD ENV PUB_CACHE /var/cache/pub

[proppy, 2014/07/02 20:55:55]

can we move that to the google/dart image?

[Søren Gjesse, 2014/07/03 10:36:41]

Yes - but maybe we don't need it after all.

+ONBUILD RUN /usr/lib/dart/bin/pub get
+ONBUILD ADD . /app
+ONBUILD RUN /usr/lib/dart/bin/pub get

[proppy, 2014/07/02 20:55:55]

maybe we can get rid of that if we suggest adding a .dockerignore file with
packages in the application directory.

[kustermann, 2014/07/03 09:40:05]

I think Soeren did this in order to cause less docker images, since only the
"ADD . /app" will usually create a different image ID (the previous steps should
always result in the same image ID). i.e. it might be a space saving technique.

[Søren Gjesse, 2014/07/03 10:36:41]

Yes the first invocation of 'RUN /usr/lib/dart/bin/pub get' creates a layer
where the pub cache is populated with the packages currently used. This is
assuming that this will not change that often. However when adding the rest of
the application the package dir will be wrong. Running 'RUN
/usr/lib/dart/bin/pub get' again or adding packages to .dockerignore fixes this.
I find that requiring .dockerignore will lead to issues, however if you have it
the secone invocation of 'RUN /usr/lib/dart/bin/pub get' should be a no-op.

[Søren Gjesse, 2014/07/03 10:36:41]

Yes.

+
+CMD []
+ENTRYPOINT ["/usr/bin/dart", "/app/bin/server.dart"]
+EXPOSE 8080