What should a YAML template optional step parameter null value be?

Question

When using a template parameter like this:

parameters:
- name: runStep
  type: step

It always requires passing a value. I would, however, like to make it optional:

parameters:
- name: runStep
  type: step
  default: ???

For stepList it can be done like so:

- name: runSteps
  type: stepList
  default: []

But how could it be done for type step? I could add a "dummy" default value:

default:
  script: echo 123

However, how could I compare that value in a condition? I'd like to do something like this:

- ${{ if parameters.runStep }}:
  - ${{ parameters.runStep }}

How about the issue? Does the answer below resolved your question, If not, would you please let me know the latest information about this issue? — Leo Liu, Jun 03 '21 at 02:09

score 1 · Answer 1 · answered Jun 01 '21 at 12:41

1

Would this work for you?

step:
- bash: |
    if [ ${{parameters.runstep}} ]; then
       ${{parameters.runstep}}
    fi

answered Jun 01 '21 at 12:41

Ked Mardemootoo

1,480
1
5
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This would only work for running shell commands and not Azure Pipelines tasks. – slikts Jun 01 '21 at 13:22
Ok my bad I misunderstood. So you want to compare the value against something or just return boolean? – Ked Mardemootoo Jun 01 '21 at 13:27

score 0 · Answer 2 · answered Jun 02 '21 at 08:00

0

What should a YAML template optional step parameter default value be?

According to the document Template types & usage:

So, the default value of YAML template optional step parameter should be a step, like:

parameters:
- name: myStep
  type: step
  default:
    script: echo my step

steps:
- ${{ if parameters.runStep }}:
  - ${{ parameters.runStep }}
  - script: echo HelloWorld!

answered Jun 02 '21 at 08:00

Leo Liu

71,098
10
114
135

1

This would always execute because the default value would always be a step, so the condition (`if parameters.runStep`) is pointless. – slikts Jun 03 '21 at 15:19

What should a YAML template optional step parameter null value be?

2 Answers2