Implement label selectors for 'tk env list'

cmd/tk/env.go

@@ -12,6 +12,7 @@ import (
 	"github.com/pkg/errors"
 	"github.com/posener/complete"
 	"github.com/spf13/pflag"
+	"k8s.io/apimachinery/pkg/labels"
 
 	"github.com/grafana/tanka/pkg/kubernetes/client"
 	"github.com/grafana/tanka/pkg/spec/v1alpha1"
@@ -205,18 +206,30 @@ func envListCmd() *cli.Command {
 	}
 
 	useJSON := cmd.Flags().Bool("json", false, "json output")
+	labelSelector := cmd.Flags().StringP("selector", "l", "", "label selector to narrow down environments")
 
 	cmd.Run = func(cmd *cli.Command, args []string) error {
 		envs := []v1alpha1.Config{}
 		dirs := findBaseDirs()
+		var selector labels.Selector
+		var err error
+
+		if *labelSelector != "" {
+			selector, err = labels.Parse(*labelSelector)
+			if err != nil {
+				return err
+			}
+		}
 
 		for _, dir := range dirs {
 			env := setupConfiguration(dir)
 			if env == nil {
 				log.Printf("Could not setup configuration from %q", dir)
 				continue
 			}
-			envs = append(envs, *env)
+			if selector == nil || selector.Empty() || selector.Matches(env.Metadata) {
+				envs = append(envs, *env)
+			}
 		}
 
 		if *useJSON {

go.mod

@@ -19,4 +19,5 @@ require (
 	golang.org/x/crypto v0.0.0-20190820162420-60c769a6c586
 	gopkg.in/yaml.v2 v2.2.8
 	gopkg.in/yaml.v3 v3.0.0-20191010095647-fc94e3f71652
+	k8s.io/apimachinery v0.18.3
 )

go.sum

@@ -1,34 +1,82 @@
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@@ -37,6 +85,7 @@ github.com/posener/complete v1.2.3 h1:NP0eAhjcjImqslEwo/1hq7gpajME0fTLTezBKDqfXq
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@@ -50,19 +99,51 @@ github.com/thoas/go-funk v0.4.0/go.mod h1:mlR+dHGb+4YgXkf13rkQTuzrneeHANxOm6+ZnE
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pkg/spec/v1alpha1/config.go

@@ -33,6 +33,17 @@ type Metadata struct {
 	Labels map[string]string `json:"labels,omitempty"`
 }
 
+// Has and Get make Metadata a simple wrapper for labels.Labels to use our map in their querier
+func (m Metadata) Has(label string) (exists bool) {
+	_, exists = m.Labels[label]
+	return exists
+}
+
+// Get implements Get for labels.Labels interface
+func (m Metadata) Get(label string) (value string) {
+	return m.Labels[label]
+}
+
 func (m Metadata) NameLabel() string {
 	return strings.Replace(m.Name, "/", ".", -1)
 }