namespace Add labels and annotation options to namespace_create and namespace_yaml (#252)

If provided, these will appear int the metadata

Author: duck1123

namespace/README.md

@@ -7,11 +7,11 @@ namespaces on Kubernetes objects.
 
 ## Functions
 
-### `namespace_yaml(name: str): Blob`
+### `namespace_yaml(name: str, annotations: List [str] = [], labels: List [str] = []): Blob`
 
 Returns YAML for a Kubernetes namespace.
 
-### `namespace_create(name: str, allow_duplicates: boolean = False)`
+### `namespace_create(name: str, allow_duplicates: boolean = False, annotations: List [str] = [], labels: List [str] = [])`
 
 Deploys a namespace to the cluster. Equivalent to
 
@@ -43,6 +43,18 @@ namespace_create(ns)
 k8s_yaml(namespace_inject(read_file('deployment.yaml'), ns))
 ```
 
+### Attach annotations and labels
+
+```
+load('ext://namespace', 'namespace_create', 'namespace_inject')
+namespace_create(
+    'my-namespace',
+    annotations=['kubernetes.io/metadata.name: my-namespace'],
+    labels=['kubernetes.io/metadata.name: my-namespace']
+)
+k8s_yaml(namespace_inject(read_file('deployment.yaml'), 'my-namespace'))
+```
+
 ## Caveats
 
 - `namespace_inject` assumes all resources are namespaced-scoped.

namespace/Tiltfile

@@ -1,31 +1,48 @@
 # -*- mode: Python -*-
 
-def namespace_yaml(name):
+def namespace_yaml(name, annotations=[], labels=[]):
   """Returns YAML for a namespace
 
   Args:
     name: The namespace name. Currently not validated.
+    annotations: Annotations applied to the namespace metadata
+    labels: Labels applied to the namespace metadata
 
   Returns:
     The namespace YAML as a blob
   """
+  annotations_str = ''
+  labels_str = ''
+  if (len(annotations) > 0):
+    annotations_str = """  annotations:
+%s
+""" % '\n'.join(["    %s" % s for s in annotations])
+  if (len(labels) > 0):
+    labels_str = """  labels:
+%s
+""" % '\n'.join(["    %s" % s for s in labels])
 
   return blob("""apiVersion: v1
 kind: Namespace
 metadata:
   name: %s
-""" % name)
+%s%s""" % (name, annotations_str, labels_str))
 
-def namespace_create(name, allow_duplicates=False):
+def namespace_create(name, allow_duplicates=False, annotations=[], labels=[]):
   """Creates a namespace in the current Kubernetes cluster.
 
   Args:
     name: The namespace name. Currently not validated.
     allow_duplicates: Whether or not k8s should be allowed to have two
       instances of the same resource. Useful if you have more than one
       Tiltfile trying to create the same namespace.
+    annotations: Annotations applied to the namespace metadata
+    labels: Labels applied to the namespace metadata
   """
-  k8s_yaml(namespace_yaml(name), allow_duplicates=allow_duplicates)
+  k8s_yaml(
+    namespace_yaml(name, annotations=annotations, labels=labels),
+    allow_duplicates=allow_duplicates
+  )
 
 def namespace_inject(x, ns):
   """Takes K8s yaml, sets its namespace to `ns`, and returns it as a blob.