Google App Engine - app.yaml environment variable generator for CI / CD systems

Generates an app.yaml file from a template and environment variables, designed for use with GitLab's CI / CD system.

Usage

Set your environment variables in GitLab (or other system), prefix variables you'd like to persist in app.yaml with "APP_", for example:

Create an app.template.yaml file include everything sans environment variables

1runtime: nodejs10
2env: standard
3
4automatic_scaling:
5  min_instances: 0
6  max_instances: 2
7
8service: default
9
10env_variables:
11  NODE_ENV: 'production'

In your CI / CD process run gae-ayaml-env to emit a populated app.yaml file, make sure you do not commit an actual app.yaml file as it will be overwritten.

Example for GitLab

1deploy:
2  image: 'rlancer/gcloud-node:LTS-229'
3  script:
4    - npm i
5    - npm run build
6    - npx gae-ayaml-env
7    - echo $GCLOUD_SERVICE > /tmp/$CI_PIPELINE_ID.json
8    - gcloud auth activate-service-account --key-file /tmp/$CI_PIPELINE_ID.json
9    - gcloud --quiet --project $GCLOUD_PROJECT_ID app deploy app.yaml
10  only:
11    - prod

The system will write an app.yaml file fully populated with all the variables prefixed with "APP_".

1runtime: nodejs10
2env: standard
3
4env_variables:
5  APIMARKET_FROM: '******************'
6  DB_DATABASE: '******************'
7  DB_HOST: '******************'
8  DB_PASSWORD: '******************'
9  DB_USER: '******************'
10  NODE_ENV: production
11  SLACK_APP_ID: '******************'
12  SLACK_BOT_TOKEN: '******************'
13  SLACK_CLIENT_ID: '******************'
14  SLACK_CLIENT_SECRET: '******************'
15  SLACK_OAUTH_REDIR: '******************'
16  SLACK_SIGNING_SECRET: '******************'
17  SLACK_TOKEN: '******************'
18  SLACK_VERIFICATION_TOKEN: '******************'
19automatic_scaling:
20  max_instances: 2

Hide Output in Console

to hide the output of the generated file in the console you can use the flag: no-output

Example using npx:

npx gae-ayaml-env --no-output

Special thanks

to @dannyzen from Google for helping Collaborizm move to GCP.