MR_UpdateBuildSetting.xml

<?xml version="1.0" encoding="UTF-8"?>
<meta-runner name="Update Build Setting">
  <description>Updates the build setting of a build definition (not build instance)</description>
  <settings>
    <parameters>
      <param name="mr.username" value="" spec="text description='Username of a user who can update the build definition' display='normal' label='Username:' validationMode='not_empty'" />
      <param name="mr.password" value="" spec="password description='Password of the user who can update the build definition' display='normal' label='Password:'" />
      <param name="mr.Setting.Name" value="" spec="text display='prompt' label='Setting Name:'" />
      <param name="mr.Setting.Value" value="" spec="text display='prompt' label='Setting Value:'" />
      <param name="mr.Setting.Condition" value="$True" spec="text display='normal' label='Condition:' description='A (PowerShell) boolean expression if the setting should be updated'" />
    </parameters>
    <build-runners>
      <runner name="" type="jetbrains_powershell">
        <parameters>
          <param name="jetbrains_powershell_bitness" value="x86" />
          <param name="jetbrains_powershell_execution" value="PS1" />
          <param name="jetbrains_powershell_noprofile" value="true" />
          <param name="jetbrains_powershell_errorToError" value="error" />
          <param name="jetbrains_powershell_script_mode" value="CODE" />
          <param name="teamcity.step.mode" value="default" />
          <param name="jetbrains_powershell_script_code"><![CDATA[[CmdletBinding()]
        param (
            $Username = "%mr.username%",
            $Password = "%mr.password%",
            $Name = "%mr.Setting.Name%",
            $Value = "%mr.Setting.Value%"
        )
        try {
            if (!([string]::IsNullOrWhiteSpace("%mr.Setting.Condition%"))) {
              $shouldUpdate = %mr.Setting.Condition%
            } else {
              $shouldUpdate = $true
            }
            if ($shouldUpdate) {
              $teamcityApiCredentials = New-Object System.Management.Automation.PSCredential($Username, (ConvertTo-SecureString $Password -AsPlainText -Force))
              $result = Invoke-WebRequest -Uri "%teamcity.serverUrl%/httpAuth/app/rest/buildTypes/%system.teamcity.buildType.id%/settings/$Name"  -Body $Value -Method PUT -UseBasicParsing -Credential $teamcityApiCredentials -ContentType "text/plain"
              if ($result.StatusCode -eq 200) {
                Write-Host "Setting '$Name' has been updated to: $($result.Content)"
              }
            }
        }
        catch {
            Write-Host "##teamcity[buildStatus text='$_' status='FAILURE']"
            Write-Host "##teamcity[message text='$_' status='ERROR']"
            exit 1
        }
        ]]></param>
        </parameters>
      </runner>
    </build-runners>
  </settings>
</meta-runner>