Install the Java version used by the Firebase Local Emulator in the Firebase builder image

[korneel]

Affected builder image

firebase (https://github.com/GoogleCloudPlatform/cloud-builders-community/tree/master/firebase)

Expected Behavior

Being able to run tests using the Firebase Local Emulator by running the command firebase emulators:exec --only=firestore ./test.sh.

Actual Behavior

The Firebase Local Emulator can't be started because Java is not available: Firestore Emulator has exited because java is not installed, you can install it from https://openjdk.java.net/install/

Steps to Reproduce the Problem

1. Build and push the Firebase community builder image to a Google Cloud project as described here.

2. Create a cloudbuild.yaml file:

steps:
  - name: 'gcr.io/$PROJECT_ID/firebase'
    args: ['emulators:exec', '--only=firestore', './test.sh']

3. Create a test.sh file:

#!/bin/sh
echo "Hello, world! The time is $(date)."

4. Start the build:

gcloud builds submit --config cloudbuild.yaml .

Additional Info

The Java version used by the Firebase Local Emulator should be installed in the Firebase builder image.

As a workaround, the Firebase Local Emulator can be used if you change FROM node to FROM timbru31/java-node in de Dockerfile of the Firebase community builder image before building and pushing it to your Google Cloud project's Container Registry.

[akauppi]

I found some packaging I'd done for this in Aug 2020 and turned it to support Cloud Registry. https://github.com/akauppi/firebase-custom-builder

[xSAVIKx]

There's also a super-charged version of the Firebase emulators suite available here: https://github.com/SpineEventEngine/gcp-emulators/tree/master/firebase-emulator