Backstage - creating a template and replace values in your template

 


1. First, you need to create an input form. 

apiVersion: scaffolder.backstage.io/v1beta3

kind: Template
# some metadata about the template itself
metadata:
  name: v1beta3-demo
  title: Test
  description: TestandTest
spec:
  owner: testowner
  type: service

  # these are the steps which are rendered in the frontend with the form input
  parameters:
    - title: Fill in some steps
      required:
        - name
      properties:
        name:
          title: short application name
          type: string
          description: Please provide a name for your application
          ui:autofocus: true
          maxLength: 10
          ui:options:
            rows: 2
        appname:
          title: Application Name
          type: string
          description: Please provide a name for your application
          ui:autofocus: true
          maxLength: 40
          ui:options:
            rows: 2
        k8snamespace:
          title: kubernetes namespace name that the application targeted to run on 
          type: string
          description: Please provide a name for your namespace
          maxLength: 12
          ui:autofocus: true
          ui:options:
            rows: 2
        azureresourcegroupname:
          title: Azure resource group name
          type: string
          description:  Resource group that will be hosting your infrastructure resources in Azure
          ui:autofocus: true
          maxLength: 10
          ui:options:
            rows: 2
        steward:
          title: Squad or steward name
          type: string
          description: Please provide a name for your team (the steward for this application)
          ui:autofocus: true
          maxLength: 20
          ui:options:
            rows: 5
    - title: Choose a location
      required:
        - repoUrl
      properties:
        repoUrl:
          title: Repository Location
          type: string
          ui:field: RepoUrlPicker
          ui:options:
            allowedHosts:
              - dev.azure.com

  # here's the steps that are executed in series in the scaffolder backend
  steps:
    - id: fetch-base
      name: Fetch Base
      action: fetch:template
      input:
        url: ./
        values: 
          name: ${{ parameters.name }}
          appname: ${{ parameters.appname }}
          k8snamespace: ${{ parameters.k8snamespace }}
          azureresourcegroupname: ${{ parameters.azureresourcegroupname }}
          steward: ${{ parameters.steward }}

 
    - id: publish
      name: Publish
      action: publish:azure
      input:
        repoUrl: ${{ parameters.repoUrl }}
        description: This is ${{ parameters.name }}
        gitCommitMessage: 'automation-work'
        default: initialcode
       
  
    - id: register
      name: Register
      action: catalog:register
      input:
        repoContentsUrl: ${{ steps['publish'].output.repoContentsUrl }}
        catalogInfoPath: /backstage/catalog-info.yaml


2. Next, you have to update your template. Let's use a very simple example, say you need these value to be populated into application.config and it has the following content 

-------------------------------- application.config -------------------------------- 

name: ${{ values.name }}
appname: ${{ values.appname }}
k8snamespace: ${{ values.k8snamespace }}
azureresourcegroupname: ${{ values.azureresourcegroupname }}

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