PostgresCluster names and namespaces for support

Adds all reachable postgrescluster names and their
namespaces to support export.

Issue: PGO-272

docs/content/reference/pgo_support_export.md

@@ -71,6 +71,7 @@ kubectl pgo support export daisy --monitoring-namespace another-namespace --outp
 | Note: No data or k8s secrets are collected.
 └────────────────────────────────────────────────────────────────
 Collecting PGO CLI version...
+Collecting names and namespaces for PostgresClusters...
 Collecting current Kubernetes context...
 Collecting Kubernetes version...
 Collecting nodes...

internal/cmd/export.go

@@ -19,6 +19,7 @@ import (
 	"bytes"
 	"compress/gzip"
 	"context"
+	"encoding/json"
 	"fmt"
 	"io"
 	"os"
@@ -147,6 +148,17 @@ var otherNamespacedResources = []schema.GroupVersionResource{{
 	Resource: "limitranges",
 }}
 
+type PostgresClusterList struct {
+	Clusters []PostgresClusterItem `json:"items"`
+}
+type PostgresClusterItem struct {
+	Metadata PostgresClusterMetadata `json:"metadata"`
+}
+type PostgresClusterMetadata struct {
+	Name      string `json:"name"`
+	Namespace string `json:"namespace"`
+}
+
 // newSupportCommand returns the support subcommand of the PGO plugin.
 func newSupportExportCommand(config *internal.Config) *cobra.Command {
 	cmd := &cobra.Command{
@@ -234,6 +246,7 @@ kubectl pgo support export daisy --monitoring-namespace another-namespace --outp
 | Note: No data or k8s secrets are collected.
 └────────────────────────────────────────────────────────────────
 Collecting PGO CLI version...
+Collecting names and namespaces for PostgresClusters...
 Collecting current Kubernetes context...
 Collecting Kubernetes version...
 Collecting nodes...
@@ -355,6 +368,10 @@ Collecting PGO CLI logs...
 		// PGO CLI version
 		err = gatherPGOCLIVersion(ctx, clusterName, tw, cmd)
 
+		if err == nil {
+			err = gatherPostgresClusterNames(clusterName, ctx, cmd, tw, clientset)
+		}
+
 		// Current Kubernetes context
 		if err == nil {
 			err = gatherKubeContext(ctx, config, clusterName, tw, cmd)
@@ -484,6 +501,38 @@ func gatherPGOCLIVersion(_ context.Context,
 	return nil
 }
 
+func gatherPostgresClusterNames(clusterName string, ctx context.Context, cmd *cobra.Command, tw *tar.Writer, clientset *kubernetes.Clientset) error {
+	restclient := clientset.CoreV1().RESTClient()
+	result := restclient.Get().AbsPath("apis/postgres-operator.crunchydata.com/v1beta1/").Resource("postgresclusters").Do(ctx)
+
+	if err := result.Error(); err != nil {
+		return err
+	}
+
+	raw, err := result.Raw()
+	if err != nil {
+		return err
+	}
+
+	var list PostgresClusterList
+	err = json.Unmarshal(raw, &list)
+	if err != nil {
+		return err
+	}
+
+	data := []byte{}
+	for _, item := range list.Clusters {
+		data = append(data, []byte("Namespace: "+item.Metadata.Namespace+"\t"+"Cluster: "+item.Metadata.Name+"\n")...)
+	}
+
+	path := clusterName + "/cluster-names"
+	if err := writeTar(tw, data, path, cmd); err != nil {
+		return err
+	}
+
+	return nil
+}
+
 // gatherKubeContext collects the current Kubernetes context
 func gatherKubeContext(_ context.Context,
 	config *internal.Config,

testing/kuttl/e2e/support-export/01--support_export.yaml

@@ -18,6 +18,14 @@ commands:
       exit 1
     }
 
+    # check that the cluster-names file exist and is not empty
+    if [[ ! -s ./kuttl-support-cluster/cluster-names ]]
+    then
+      echo "Expected cluster-names file to not be empty"
+      eval "$CLEANUP"
+      exit 1
+    fi
+
     # check that the context file exist and is not empty
     if [[ ! -s ./kuttl-support-cluster/current-context ]]
     then
@@ -26,7 +34,6 @@ commands:
       exit 1
     fi
 
-
     # check for expected gzip compression level
     FILE_INFO=$(file ./crunchy_k8s_support_export_*.tar.gz)
     [[ "${FILE_INFO}" == *'gzip compressed data, max compression'* ]] || {