»labels Variable

The labels variable is a map of the full set of labels that are set for the current operation.

Example: Kubernetes Annotations

The example below shows how we can set annotations on a Kubernetes deployment to mirror the Waypoint labels we have set.

app "web" {
  deploy {
    use "kubernetes" {
      annotations = { for k, v in labels: "waypoint/${k}" => v }
    }
  }
}

This examples goes a bit further and uses HCL map expressions to prefix all our labels with "waypoint/" to note they come from Waypoint. If you wanted to just map the labels directly, you can do annotations = labels directly.

Example: Conditional on Labels

The example below shows how we can use the selectormatch function to perform conditional logic with labels. The selector-prefixed functions all use the common label selector syntax that is used throughout various features in Waypoint.

app "web" {
  deploy {
    use "kubernetes" {
      image_secret = selectormatch(labels, "env == production") ?
        "ProdSecret" : "DevSecret"
    }
  }
}

This could also be done with selectorlookup which allows mapping matching selector expressions to specific values:

app "web" {
  deploy {
    use "kubernetes" {
      image_secret = selectorlookup(labels, {
        "env == production" = "ProdSecret"
      }, "DevSecret")
    }
  }
}