[GitHub] rabbah commented on a change in pull request #3496: Add multi-arch runtimes doc

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rabbah commented on a change in pull request #3496: Add multi-arch runtimes doc
URL: https://github.com/apache/incubator-openwhisk/pull/3496#discussion_r177722878
 
 

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 File path: docs/runtimes-building.md
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+
+# Working with Runtimes locally
+
+This document is designed to be applied to the various
+`incubator-openwhisk-runtimes-*` repositories as they are converted to
+multi-architecture build. The multi-architecture build supports building Docker
+multi-architecture manifest lists across (currently) amd64, Power 64
+(little-endian), and System Z (s390x) architectures.  The framework is designed
+to extend to other chips, including the Arm64 chipset.
+
+You can tell that a runtime has been converted to a multi-architecture build
+by referring to its root `README.md` file.
+
+## Reading this document
+
+For this document, we will assume an environment variable `ACTION_NAME` has
+been set to the directory name of an action in the runtime repository on which
+work is being done (i.e. set to `nodejs6Action` while working in
+`incubator-openwhisk-runtime-nodejs`).
+
+## Building a single-architecture Docker image locally
+
+To build a single-architecture image locally on a 64-bit x86 machine, execute
+
+```
+./gradlew core:$ACTION_NAME:dockerBuildImage -Pdocker_local_json='{"amd64":null}'
+```
+
+To check on what images will be produced, look in the `settings.json` file in
 
 Review comment:
   wdyt about a gralde task to print the various properties?

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