change build variable with powershell not working

Question

I want to change the tfs variable BUILD_SOURCEBRANCHNAME while building, using this powershell script in my build step:

##vso[build.sourcebranch]master

This doesn't throw errors, but is not working either?

How can I achieve this?

Answer 1

The syntax to change any environment variable in Azure DevOps is:

Write-Host "##vso[task.setvariable variable=someVar]varValue"

So in your case, if you want to "fake" the source branch:

$fakeBranch = "shayki"
Write-Host "##vso[task.setvariable variable=build.sourcebranch]$fakeBranch"
Write-Host "##vso[task.setvariable variable=build.sourcebranchname]$fakeBranch"

The variables before:

The script:

The variables after: