TFS Build vNext: How to write to a custom build variable from Powershell

Question

I have a Powershell script that needs to set a custom build variable, such that it can be used in a later task. I have successfully added a variable, and verified it can be accessed and set from Powershell, but, for whatever reason, the change does not persist when referencing the variable in a later build step.

Write-Host $env:VERSIONNUMBER #prints the variable value set in TFS Build
$env:VERSIONNUMBER = 'This doesn't stick'
Write-Host $env:VERSIONNUMBER #prints 'This doesn't stick', but not available after this task

Hers is a example "Use a script to customize your build process", you can have a check: https://msdn.microsoft.com/Library/vs/alm/Build/scripts/index — Cece Dong - MSFT, Oct 28 '15 at 07:43
Thanks for this, unfortunately, this doesn't assign to a custom build variable for later use. It just reads from a predefined variable and adjusts a file. — pianomanjh, Oct 28 '15 at 15:41

score 2 · Answer 1 · edited Mar 18 '16 at 16:32

2

Try the following in your PowerShell script

Write-Host “##vso[task.setvariable variable=myvariable]newValue”

this worked for me in Release Management vNext, but I would assume it also works in the build system as well.

edited Mar 18 '16 at 16:32

Phiter

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answered Mar 18 '16 at 16:10

Kevin Kraus

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TFS Build vNext: How to write to a custom build variable from Powershell

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