Error TF400898 when Increment DevOps variable group value from PS script-CodePudding

I have an issue with a Powershell script to get, increment and put new value to a variable in a DevOps variablegroup.

There seem to be an issue with adding a variable in to the $json object string. Not sure how I can add the incremented value into the string, please advise!

The script:

# Base64-encodes the Personal Access Token (PAT) appropriately
$base64AuthInfo = [Convert]::ToBase64String([Text.Encoding]::ASCII.GetBytes(("{0}:{1}" -f "","$env:SYSTEM_ACCESSTOKEN")))
$url = "$($env:SYSTEM_TEAMFOUNDATIONCOLLECTIONURI)$env:SYSTEM_TEAMPROJECTID/_apis/distributedtask/variablegroups/1?api-version=6.0-preview.1"

$pipeline = Invoke-RestMethod -Uri $url -Method Get -ContentType "application/json" -Headers @{Authorization=("Basic {0}" -f $base64AuthInfo)}
Write-Host "Get Variable Value:" $pipeline.variables.MinorVersion.value

$versionNumber = [int]$pipeline.variables.MinorVersion.value
$versionNumber  
Write-Host "$versionNumber Variable Value:" $versionNumber

$json = '{"id":2555,"type":"Vsts","name":"VersionNumberVG","variables":{"MinorVersion":{"value":$versionNumber}}}'
$pipeline = Invoke-RestMethod -Uri $url -Method Put -Body $json -ContentType "application/json" -Headers @{Authorization=("Basic {0}" -f $base64AuthInfo)}
Write-Host "PUT New Variable Value:" $pipeline.variables.MinorVersion.value

$pipeline = Invoke-RestMethod -Uri $url -Method Get -ContentType "application/json" -Headers @{Authorization=("Basic {0}" -f $base64AuthInfo)}
Write-Host "Get Variable Value:" $pipeline.variables.MinorVersion.value

The error I get:

Invoke-RestMethod : {"$id":"1","innerException":null,"message":"TF400898: An Internal Error Occurred. Activity Id: xxxxxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxx.","typeName":"Newtonsoft.Jso
n.JsonReaderException, Newtonsoft.Json","typeKey":"JsonReaderException","errorCode":0,"eventId":0}
At line:13 char:13
  $pipeline = Invoke-RestMethod -Uri $url -Method Put -Body $json -Cont ...
              ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
      CategoryInfo          : InvalidOperation: (System.Net.HttpWebRequest:HttpWebRequest) [Invoke-RestMethod], WebException
      FullyQualifiedErrorId : WebCmdletWebResponseException,Microsoft.PowerShell.Commands.InvokeRestMethodCommand

CodePudding user response：

The cause of the issue is that the body format has issues.

You can try the following PowerShell sample to define the body and run the Rest API:

$base64AuthInfo = [Convert]::ToBase64String([Text.Encoding]::ASCII.GetBytes(("{0}:{1}" -f "","$env:SYSTEM_ACCESSTOKEN")))
$url = "$($env:SYSTEM_TEAMFOUNDATIONCOLLECTIONURI)$env:SYSTEM_TEAMPROJECTID/_apis/distributedtask/variablegroups/1?api-version=6.0-preview.1"

$pipeline = Invoke-RestMethod -Uri $url -Method Get -ContentType "application/json" -Headers @{Authorization=("Basic {0}" -f $base64AuthInfo)}
Write-Host "Get Variable Value:" $pipeline.variables.MinorVersion.value

$versionNumber = [int]$pipeline.variables.MinorVersion.value
$versionNumber  
Write-Host "$versionNumber Variable Value:" $versionNumber


$json = 
"{
    `"name`":`"VersionNumberVG`",

    `"type`":`"Vsts`",
    `"variables`":{
        `"MinorVersion`":{
            `"isSecret`":false,
            `"value`": `"$versionNumber`"
            }
        }

}"
$pipeline = Invoke-RestMethod -Uri $url -Method Put -Body $json -ContentType "application/json" -Headers @{Authorization=("Basic {0}" -f $base64AuthInfo)}
Write-Host "PUT New Variable Value:" $pipeline.variables.MinorVersion.value

$pipeline = Invoke-RestMethod -Uri $url -Method Get -ContentType "application/json" -Headers @{Authorization=("Basic {0}" -f $base64AuthInfo)}
Write-Host "Get Variable Value:" $pipeline.variables.MinorVersion.value

Result: