[WIP] Predefined Dynamic namespaces

README.md

@@ -39,6 +39,9 @@ porter mixin install kubernetes --version $VERSION --url https://github.com/getp
 ```yaml
 - kubernetes:
     clientVersion: v1.15.5
+    namespaces:
+      - my-namespace-1
+      - my-namespace-2
 ```
 
 ### Mixin Actions Syntax
@@ -52,7 +55,6 @@ install:
       manifests:
         - /cnab/app/manifests/hello
       wait: true
-
 ```
 
 #### Upgrade Action
@@ -64,7 +66,6 @@ upgrade:
       manifests:
         - /cnab/app/manifests/hello
       wait: true
-
 ```
 
 #### Uninstall Action
@@ -76,7 +77,6 @@ uninstall:
       manifests:
         - /cnab/app/manifests/hello
       wait: true
-
 ```
 
 #### Outputs
@@ -85,9 +85,9 @@ The mixin supports extracting resource metadata from Kubernetes as outputs.
 
 ```yaml
 outputs:
-    - name: NAME
-      resourceType: RESOURCE_TYPE
-      resourceName: RESOURCE_TYPE_NAME
-      namespace: NAMESPACE
-      jsonPath: JSON_PATH_DEFINITION
+  - name: NAME
+    resourceType: RESOURCE_TYPE
+    resourceName: RESOURCE_TYPE_NAME
+    namespace: NAMESPACE
+    jsonPath: JSON_PATH_DEFINITION
 ```

pkg/kubernetes/build.go

@@ -3,6 +3,7 @@ package kubernetes
 import (
 	"bytes"
 	"fmt"
+	"strings"
 	"text/template"
 
 	"get.porter.sh/porter/pkg/exec/builder"
@@ -24,7 +25,8 @@ chmod a+x /usr/local/bin/kubectl
 )
 
 type MixinConfig struct {
-	ClientVersion string `yaml:"clientVersion,omitempty"`
+	ClientVersion string   `yaml:"clientVersion,omitempty"`
+	Namespaces    []string `yaml:"namespaces,omitempty"`
 }
 
 // BuildInput represents stdin passed to the mixin for the build command.
@@ -74,6 +76,16 @@ func (m *Mixin) Build() error {
 		return err
 	}
 
+	// Go through Namespaces if defined
+	if len(input.Config.Namespaces) > 0 {
+		namespacesCommand, err := getNamespacesCommand(input.Config.Namespaces)
+		if err != nil && m.Debug {
+			fmt.Fprintf(m.Err, "DEBUG: addition of namespace failed: %s\n", err.Error())
+		} else {
+			fmt.Fprintf(m.Out, strings.Join(namespacesCommand, " "))
+		}
+	}
+
 	return nil
 }
 
@@ -91,3 +103,15 @@ func validate(clientVersion, constraint string) (bool, error) {
 
 	return c.Check(v), nil
 }
+
+func getNamespacesCommand(namespaces []string) (namespaceCommand []string, err error) {
+
+	var commandBuilder []string
+	//
+	for _, namespace := range namespaces {
+		commandBuilder = append(commandBuilder, "kubectl", "create", "namespace", namespace, "||", "true;")
+	}
+	commandBuilder = append([]string{"\nRUN"}, commandBuilder...)
+
+	return commandBuilder, nil
+}

pkg/kubernetes/build_test.go

@@ -45,4 +45,21 @@ func TestMixin_Build(t *testing.T) {
 		gotOutput := m.TestContext.GetOutput()
 		assert.Equal(t, wantOutput, gotOutput)
 	})
+
+	t.Run("build with custom Kubernetes version", func(t *testing.T) {
+		b, err := ioutil.ReadFile("testdata/build-input-with-namespaces.yaml")
+		require.NoError(t, err)
+
+		m := NewTestMixin(t)
+		m.Debug = false
+		m.In = bytes.NewReader(b)
+		err = m.Build()
+		require.NoError(t, err)
+
+		wantOutput := fmt.Sprintf(buildOutputTemplate, "v1.15.5") +
+			"\nRUN kubectl create namespace my-namespace-1 || true; kubectl create namespace my-namespace-2 || true; " +
+			"kubectl create namespace my-namespace-3 || true; kubectl create namespace my-namespace-4 || true;"
+		gotOutput := m.TestContext.GetOutput()
+		assert.Equal(t, wantOutput, gotOutput)
+	})
 }

pkg/kubernetes/testdata/build-input-with-namespaces.yaml

@@ -0,0 +1,6 @@
+config:
+  namespaces:
+    - my-namespace-1
+    - my-namespace-2
+    - my-namespace-3
+    - my-namespace-4