pkg/types/installconfig: Add an (*InstallConfig).Tags() helper

AWS resources created by the cluster (e.g. some elastic
load-balancers) are currently missing the tectonicClusterID tag [1],
which makes cleanup difficult.  This helper makes it easy for those
external tools to set the appropriate tags without needing local logic
to generate them.

[1]: #458 (comment)

pkg/types/installconfig.go

@@ -48,6 +48,21 @@ func (c *InstallConfig) MasterCount() int {
  return 1
 }
 
+// Tags returns tags which should be added to resources created for
+// the cluster. This includes both installer- and user-specified tags.
+func (c *InstallConfig) Tags() (tags map[string]string) {
+ tags = make(map[string]string)
+ tags["tectonicClusterID"] = c.ClusterID
+
+ if c.Platform.AWS != nil {
+ for key, value := range c.Platform.AWS.UserTags {
+ tags[key] = value
+ }
+ }
+
+ return tags
+}
+
 // Admin is the configuration for the admin user.
 type Admin struct {
  // Email is the email address of the admin user.

pkg/types/installconfig_test.go

@@ -0,0 +1,27 @@
+package types
+
+import (
+ "testing"
+
+ "github.com/stretchr/testify/assert"
+)
+
+func TestTags(t *testing.T) {
+ config := &InstallConfig{
+ ClusterID: "123",
+ Platform: Platform{
+ AWS: &AWSPlatform{
+ UserTags: map[string]string{
+ "abc": "def",
+ },
+ },
+ },
+ }
+
+ expected := map[string]string{
+ "abc": "def",
+ "tectonicClusterID": "123",
+ }
+
+ assert.Equal(t, expected, config.Tags())
+}