Conditional Resource Instance Execution

[ThomasNieto]

Summary of the new feature / enhancement

As a user I want to be able to write a generic configuration document that has conditional logic to leverage configuration parameters and flex on those to conditionally execute resource instances.

Proposed technical implementation details (optional)

Use GitHub action conditional job execution and comparison operators.

    type: owner[.group][.area]/name
    name: instance_name
    if: "[parameters('softwareVersion')] >= 2.0"
    properties:
      propertyName: propertyValue

[SteveL-MSFT]

We could leverage ARM's condition property for this https://learn.microsoft.com/en-us/azure/azure-resource-manager/templates/syntax#resources

[Gijsreyn]

I'm not sure if Thomas is referring to a conditional resource. In Bicep to ARM, this should compile to what you mean:

targetScope = 'desiredStateConfiguration'

param InstallWinGetPackage bool = true

resource powerShellAdapter 'Microsoft.DSC/PowerShell@2025-01-07' = if (InstallWinGetPackage) {
  name: 'Run WinPS script'
  properties: {
      resources: [
          {
              name: 'Install WinGet package'
              type: 'Microsoft.WinGet.DSC/WinGetPackage'
              properties: {
                  Id: 'Microsoft.WindowsTerminal'
                  Ensure: 'Present'
                  Source: 'winget'
              }
          }
      ]
  }
}

I think what Thomas is hinting at is something like this:

targetScope = 'desiredStateConfiguration'

param WinGetPackageName string? // <-- Set as optional

resource powerShellAdapter 'Microsoft.DSC/PowerShell@2025-01-07' = {
  name: 'Run WinPS script'
  properties: {
      resources: [
          {
              name: 'Install WinGet package'
              type: 'Microsoft.WinGet.DSC/WinGetPackage'
              properties: {
                  Id: WinGetPackageName
              }
          }
      ]
  }
}

I'm only wondering how this gets compiled to ARM and gets digested by dsc.exe.