the property 'value' cannot be found on this object azure release pipeline - azure

Question

I'm using below code to update the Release definition in Powershell,
PowerShell_1:
Write-Host ">>>>>>>>>Start in Task 1: "$(pos)
Write-Host "##vso[task.setvariable variable=pos;]Yes"
PowerShell_2
$url = "$($env:SYSTEM_TEAMFOUNDATIONSERVERURI)$env:SYSTEM_TEAMPROJECTID/_apis/Release/definitions/$($env:RELEASE_DEFINITIONID)?api-version=5.0-preview.3"
$pipeline = Invoke-RestMethod -Uri $url -Headers #{
Authorization = "Bearer $env:SYSTEM_ACCESSTOKEN"
}
Write-Host "Pipeline = $($pipeline | ConvertTo-Json -Depth 100)"
$pipeline.variables.pos.value = "$(pos)"
$json = #($pipeline) | ConvertTo-Json -Depth 99
$updatedef = Invoke-RestMethod -Uri $url -Method Put -Body $json -ContentType "application/json" -Headers #{Authorization = "Bearer $env:SYSTEM_ACCESSTOKEN"}
Write-Host "After in Task 2: "$(pos)
But issue is, i'm using the above code in two Tasks in a Release Pipeline,
The above code is passes in Task 1, but the same code throws below error on Task 2,
Release Variable:
Please Help me to get out of this.
Thanks in advance.

Answer 1

Something must have changed here 2021, reference to this developer community article.
I am trying to update my Azure DevOps Pipeline Variable via PowerShell task in YAML.
All authorizations are present. Here is my PowerShell task:
$url = "$($env:SYSTEM_TEAMFOUNDATIONSERVERURI)$env:SYSTEM_TEAMPROJECTID/_apis/Release/definitions/$($env:RELEASE_DEFINITIONID)?api-version=5.0"
Write-Host "URL: $url"
$pipeline = Invoke-RestMethod -Uri $url -Headers #{
Authorization = "Bearer $env:SYSTEM_ACCESSTOKEN"
}
Write-Host "Pipeline = $($pipeline | ConvertTo-Json -Depth 100)"
$pipeline.variables.test.value = "0"
####****************** 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 'test' is updated to" $updatedef.variables.test.value
write-host "=========================================================="
Unfortunately I get the following error: The property 'value' cannot be found on this object. Verify that the property exists and can be set.
Any ideas?
I have found a solution for myself.
#Azure DevOps Personal Access Token
$MyPat = '*****';
$B64Pat = [Convert]::ToBase64String([System.Text.Encoding]::UTF8.GetBytes(":$MyPat"));
#DevOps API
$url = 'https://dev.azure.com/<Organisation>/<Project>/_apis/distributedtask/variablegroups?api-version=6.0-preview.2';
$pipeline = Invoke-RestMethod -Uri $url -Headers #{
Authorization = "Basic $B64Pat"
}
#complete output as JSON
Write-Host "Pipeline = $($pipeline | ConvertTo-Json -Depth 100)";
#my value in JSON
$variable = $pipeline.value.variables.MyVariable.value;

Answer 2

Because your answer in the $pipeline variable contains the source code of the error page.
I think, you use the wrong URL:
$url = "$($env:SYSTEM_TEAMFOUNDATIONSERVERURI)$env:SYSTEM_TEAMPROJECTID/_apis/Release/definitions/$($env:RELEASE_DEFINITIONID)?api-version=5.0-preview.3"
You may try to use of the following for inline script:
$url = "$(System.TeamFoundationServerUri)/$(System.TeamProjectId)/_apis/Release/definitions/$(Release.DefinitionId)?api-version=5.0-preview.3"
or for PS file:
$serverUrl = $env:SYSTEM_TEAMFOUNDATIONSERVERURI
$teamProjectID = $env:SYSTEM_TEAMPROJECTID
$releaseID = $env:RELEASE_DEFINITIONID
$url = "$serverUrl/$teamProjectID/_apis/Release/definitions/$releaseID?api-version=5.0-preview.3"

Answer 3

I have tested it with the code you shared and the details steps as below.
Create a new release definition->add variable pos and set the value to No
Add task power shell to set variable as env variable.
Write-Host ">>>>>>>>>Start in Task 1: "$(pos)
Write-Host "##vso[task.setvariable variable=pos;]Yes"
Result:
Add task bash and enter the script printenv to print all env variable to check it.
Add task power shell and enter below script to update the release variable.
$url = "$($env:SYSTEM_TEAMFOUNDATIONSERVERURI)$env:SYSTEM_TEAMPROJECTID/_apis/Release/definitions/$($env:RELEASE_DEFINITIONID)?api-version=5.0-preview.3"
$pipeline = Invoke-RestMethod -Uri $url -Headers #{
Authorization = "Bearer $env:SYSTEM_ACCESSTOKEN"
}
Write-Host "Pipeline = $($pipeline | ConvertTo-Json -Depth 100)"
$pipeline.variables.pos.value = $($env:POS)
Write-Host "The variable pos value is" $pipeline.variables.pos.value
$json = #($pipeline) | ConvertTo-Json -Depth 99
$updatedef = Invoke-RestMethod -Uri $url -Method Put -Body $json -ContentType "application/json" -Headers #{Authorization = "Bearer $env:SYSTEM_ACCESSTOKEN"}
Write-Host "After in Task 2: "$(pos)
Result: