How to modify Azure DevOps release definition variable from a release task? - azure-devops

Question

What is the easiest way to get key rotation to work for azure storage accounts from a AzureDevOps relase task? The current plan is to re-generate the old key after release to invalidate it, and have a fresh key that can be used on next deployment. But to get that to work it seems like I at least need to store the name of the key to use in a release variable.
I had a look at he logging tasks (https://github.com/Microsoft/azure-pipelines-tasks/blob/master/docs/authoring/commands.md), but that only changes the value in the current release and does not modify the release definition.

Answer 1

You can use the REST API (Definitions - Update) to update the value of the release definition variable from a release task.
Go to the Agent Phase and select Allow Scripts to Access OAuth Token. See Use the OAuth token to access the REST API
Grant Project Collection Build Service (xxx) account the edit
release pipeline permission. (Select the release pipeline --> ... --> Security --> Edit release definition set to Allow)
Add a PowerShell task in your release pipeline
Run inline script: (Update the value of variable v1030 in below sample)
$url = "$($env:SYSTEM_TEAMFOUNDATIONSERVERURI)$env:SYSTEM_TEAMPROJECTID/_apis/Release/definitions/$($env:RELEASE_DEFINITIONID)?api-version=5.0-preview.3"
Write-Host "URL: $url"
$pipeline = Invoke-RestMethod -Uri $url -Headers #{
Authorization = "Bearer $env:SYSTEM_ACCESSTOKEN"
}
Write-Host "Pipeline = $($pipeline | ConvertTo-Json -Depth 100)"
# Update an existing variable named v1030 to its new value 1035
$pipeline.variables.v1030.value = "1035"
####****************** update the modified object **************************
$json = #($pipeline) | ConvertTo-Json -Depth 99
$updatedef = Invoke-RestMethod -Uri $url -Method Put -Body $json -ContentType "application/json" -Headers #{Authorization = "Bearer $env:SYSTEM_ACCESSTOKEN"}
write-host "=========================================================="
Write-host "The value of Varialbe 'v1030' is updated to" $updatedef.variables.v1030.value
write-host "=========================================================="

Answer 2

Here is a much cleaner and better solution that also allows for multiple builds being triggered simultaneously.
https://tsuyoshiushio.medium.com/how-to-pass-variables-with-pipeline-trigger-in-azure-pipeline-5771c5f18f91
Essentially your triggering build produces artifacts that your triggered build reads and turns into variables.
Still not at all great, but better than nothing and better than REST calls setting static global variable groups.

Answer 3

The other answer above talks about how to update Release pipelines.
If you would like to update a Build Pipeline's variables, here is how you do that:
Edit build pipeline
Go to the Agent Phase and select Allow Scripts to Access OAuth Token. See Use the OAuth token to access the REST API
Go to Manage Security -> Users -> Select Project Collection Build Service (YOUR TEAM NAME HERE)
Change "Edit Build Definitions" to Allow
Now add a powershell stage - 2.x - inline script called Update variables.
Script inline contents:
$api_version='5.0-preview.6'
$url = "$($env:SYSTEM_TEAMFOUNDATIONSERVERURI)$env:SYSTEM_TEAMPROJECTID/_apis/build/definitions/$(System.DefinitionId)?api-version=${api_version}"
Write-Host "URL: $url"
$pipeline = Invoke-RestMethod -Uri $url -Headers #{
Authorization = "Bearer $env:SYSTEM_ACCESSTOKEN"
}
Write-Host "Pipeline = $($pipeline | ConvertTo-Json -Depth 100)"
# Update variables as desired here:
$pipeline.variables.mavenBuildVersionPatch.value = "2401"
####****************** update the modified object **************************
$json = #($pipeline) | ConvertTo-Json -Depth 99
$updatedef = Invoke-RestMethod -Uri $url -Method Put -Body $json -ContentType "application/json" -Headers #{Authorization = "Bearer $env:SYSTEM_ACCESSTOKEN"}
write-host "=========================================================="
Write-host "The value of Variable mavenBuildVersionPatch is updated to" $updatedef.variables.mavenBuildVersionPatch.value
write-host "=========================================================="
Take note of the API version in this script is 5.0-preview.6.
If your version of Azure Devops is newer, you may need to update this in the future.
Save build pipeline.
Now when you run job, after the job completes this powershell stage, this variable will be set.
Important: If you want to update a variable then make the updated variable for other pipeline stages, then you do it with a powershell stage with the following inline script:
$mavenBuildVersionPatch = [int]"$(mavenBuildVersionPatch)"
$mavenBuildVersionPatch = $mavenBuildVersionPatch + 1
Write-Host "##vso[task.setvariable variable=mavenBuildVersionPatch;]$mavenBuildVersionPatch"
This example would take our existing patch number and increment it by 1.
This does not save the variable at the end of the job, you still need to do that with another powershell script if desired.