Some hints for Azure pipeline

Below are some hints to use Azure pipeline

1. If a variable is dependent on another, then the latter should be a constant. If both are evaludated from a non-constant expression then the value may not be correct. E.g.

variables:
  a: 1
  b: a+1
  c: b+1

2. Quote the parameters otherwise the value may not be considered as string.
E.g. stage S1 is fine whereas S2 will throw an error.

parameters:
  - name: envName
    displayName: environment name
    type: string
    default: prod
    values:
      - prod

stages:
  - stage: S1
    condition: eq('${{parameters.envName}}', 'prod')
  - stage: S2
    condition: eq( ${{parameters.envName}} , 'prod')

3. Use | for convenience. E.g.

condition: |
  and (
    succeeded(),
    eq('$(version)', '1.2')
  )
script: |
  echo aa
  echo bb

4. Use single quotes to escape : in script.
E.g. Script S1 is fine whereas S2 throws errors

- script: 'echo "TODO: Add tests" here'
  displayName: S1
- script: echo '"TODO: Add tests" here'
  displayName: S2

5. Use dependsOn to ensure job dependency. succeeded() does not ensure that. E.g.

- job: j1
  displayName: Build app
- job: j2
  displayName: Deploy app
  dependsOn: j1

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