From fe1f3bcdbef8efaa5c4d6d6faebd576e1b84249d Mon Sep 17 00:00:00 2001
From: Drew Sessler <drew.sessler@crunchydata.com>
Date: Wed, 7 Dec 2022 23:55:44 +0000
Subject: [PATCH] Update to make CLI backwards compatible with Kube versions <
 1.25.

[sc-16942]
---
 internal/cmd/export.go                        | 29 +++++++++++++++++++
 .../kuttl/e2e/version/00--check-version.yaml  | 19 +++++++-----
 2 files changed, 41 insertions(+), 7 deletions(-)

diff --git a/internal/cmd/export.go b/internal/cmd/export.go
index a1273eba..591fd455 100644
--- a/internal/cmd/export.go
+++ b/internal/cmd/export.go
@@ -27,8 +27,10 @@ import (
 	"github.com/spf13/cobra"
 	appsv1 "k8s.io/api/apps/v1"
 	batchv1 "k8s.io/api/batch/v1"
+	batchv1beta1 "k8s.io/api/batch/v1beta1"
 	corev1 "k8s.io/api/core/v1"
 	policyv1 "k8s.io/api/policy/v1"
+	policyv1beta1 "k8s.io/api/policy/v1beta1"
 	apierrors "k8s.io/apimachinery/pkg/api/errors"
 	metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
 	"k8s.io/apimachinery/pkg/apis/meta/v1/unstructured"
@@ -90,6 +92,17 @@ var namespacedResources = []schema.GroupVersionResource{{
 	Resource: "serviceaccounts",
 }}
 
+// These "removed" GVRs are for making our CLI backwards compatible with older PGO versions.
+var removedNamespacedResources = []schema.GroupVersionResource{{
+	Group:    batchv1beta1.SchemeGroupVersion.Group,
+	Version:  batchv1beta1.SchemeGroupVersion.Version,
+	Resource: "cronjobs",
+}, {
+	Group:    policyv1beta1.SchemeGroupVersion.Group,
+	Version:  policyv1beta1.SchemeGroupVersion.Version,
+	Resource: "poddisruptionbudgets",
+}}
+
 // newSupportCommand returns the support subcommand of the PGO plugin.
 func newSupportExportCommand(config *internal.Config) *cobra.Command {
 	cmd := &cobra.Command{
@@ -388,6 +401,22 @@ func gatherNamespacedAPIResources(ctx context.Context,
 			List(ctx, metav1.ListOptions{
 				LabelSelector: "postgres-operator.crunchydata.com/cluster=" + clusterName,
 			})
+		// If the API returns an IsNotFound error, it is likely because the kube version in use
+		// doesn't support the version of the resource we are attempting to use and there is an
+		// earlier version we can use. This block will check the "removed" resources for a match
+		// and use it if it exists.
+		if apierrors.IsNotFound(err) {
+			for _, bgvr := range removedNamespacedResources {
+				if bgvr.Resource == gvr.Resource {
+					gvr = bgvr
+					list, err = client.Resource(gvr).Namespace(namespace).
+						List(ctx, metav1.ListOptions{
+							LabelSelector: "postgres-operator.crunchydata.com/cluster=" + clusterName,
+						})
+					break
+				}
+			}
+		}
 		if err != nil {
 			if apierrors.IsForbidden(err) {
 				cmd.Println(err.Error())
diff --git a/testing/kuttl/e2e/version/00--check-version.yaml b/testing/kuttl/e2e/version/00--check-version.yaml
index c061f5a3..5bdd803d 100644
--- a/testing/kuttl/e2e/version/00--check-version.yaml
+++ b/testing/kuttl/e2e/version/00--check-version.yaml
@@ -2,22 +2,27 @@ apiVersion: kuttl.dev/v1beta1
 kind: TestStep
 commands:
 - script: |
-    OPERATOR_VERSION=$(
-        kubectl get crd postgresclusters.postgres-operator.crunchydata.com \
-          -o yaml | \
-          grep app.kubernetes.io/version | \
-          awk '{print $2}'
-    )
-
     VERSION_OUTPUT=$(kubectl pgo version)
     CLI_VERSION=$(kubectl pgo version | awk '{print $3}')
 
     # the CLI version isn't empty and the CLI version output follows the expected format
     if [[ -z $CLI_VERSION || $VERSION_OUTPUT != *"Client Version: "* ]]; then
+      echo "Version output is: "
+      echo "'$VERSION_OUTPUT'"
       exit 1
     fi
+- script: |
+    OPERATOR_VERSION=$(
+        kubectl get crd postgresclusters.postgres-operator.crunchydata.com \
+          -o go-template='{{ index .metadata.labels "app.kubernetes.io/version" }}'
+    )
+
+    VERSION_OUTPUT=$(kubectl pgo version)
 
     # the operator version isn't empty and the version output matches the CRD value
     if [[ -z $OPERATOR_VERSION || $VERSION_OUTPUT != *"Operator Version: v$OPERATOR_VERSION"* ]]; then
+      echo "Version output is: "
+      echo "$VERSION_OUTPUT"
+      echo "Expected: v$OPERATOR_VERSION"
       exit 1
     fi