Add volsync self test

Testing volsync without ramen is the best way to understand how it works
and how we need to use it when using minikube (or vanilla k8s?).

For this test we have 2 directories:

- source: resources for source cluster. Applying creates the namespace,
  pvc and busybox deployment.

- destination: resources for destination cluster. Applying creates a
  namespace and volsync replication destination on destination cluster.

We use security context to run the busybox app as unprivileged user and
set the ownership of the pvc. Without this the busybox app runs as root
on minikube. It is possible to allow volsync privileged movers using an
annotation on the namespace but this is great pain to use and conflicts
with ocm, and there is no reason to run the busybox app as root.

To test replication I did this manually:
- apply source kustomization to cluster dr1
- apply destination kustomization to cluster dr2
- copy the volsync secret from cluster dr2 to cluster dr1
- export the volsync service using subctl on cluster dr2
- apply the replication source on cluster dr1

These steps should be done by the test scripts in the next version.

We also need to change the way the app writes data, logging every 10
seconds is not helpful for this test, it is better that the test will
write data to the pod write before creating the replication source.

Signed-off-by: Nir Soffer <nsoffer@redhat.com>

test/addons/volsync/destination/kustomization.yaml

@@ -0,0 +1,7 @@
+# SPDX-FileCopyrightText: The RamenDR authors
+# SPDX-License-Identifier: Apache-2.0
+
+---
+resources:
+- namespace.yaml
+- replication-dst.yaml

test/addons/volsync/destination/namespace.yaml

@@ -0,0 +1,8 @@
+# SPDX-FileCopyrightText: The RamenDR authors
+# SPDX-License-Identifier: Apache-2.0
+
+---
+apiVersion: v1
+kind: Namespace
+metadata:
+  name: busybox

test/addons/volsync/destination/replication-dst.yaml

@@ -0,0 +1,20 @@
+# SPDX-FileCopyrightText: The RamenDR authors
+# SPDX-License-Identifier: Apache-2.0
+
+---
+apiVersion: volsync.backube/v1alpha1
+kind: ReplicationDestination
+metadata:
+  name: busybox-dst
+  namespace: busybox
+spec:
+  rsyncTLS:
+    copyMethod: Snapshot
+    capacity: 1Gi
+    accessModes: [ReadWriteOnce]
+    storageClassName: csi-hostpath-sc
+    volumeSnapshotClassName: csi-hostpath-snapclass
+    moverSecurityContext:
+      runAsUser: 10000
+      runAsGroup: 10000
+      fsGroup: 10000

test/addons/volsync/source/deploy.yaml

@@ -0,0 +1,47 @@
+# SPDX-FileCopyrightText: The RamenDR authors
+# SPDX-License-Identifier: Apache-2.0
+
+---
+apiVersion: apps/v1
+kind: Deployment
+metadata:
+  labels:
+    appname: busybox
+  name: busybox
+  namespace: busybox
+spec:
+  replicas: 1
+  selector:
+    matchLabels:
+      appname: busybox
+  template:
+    metadata:
+      labels:
+        appname: busybox
+    spec:
+      containers:
+      - image: docker.io/library/busybox:latest
+        imagePullPolicy: IfNotPresent
+        name: busybox
+        command:
+        - sh
+        - -c
+        - |
+          trap exit TERM
+          while true; do
+              echo $(date) | tee -a /mnt/test/outfile
+              sync
+              sleep 10 &
+              wait
+          done
+        volumeMounts:
+        - name: volume
+          mountPath: /mnt/test
+      volumes:
+      - name: volume
+        persistentVolumeClaim:
+          claimName: busybox-pvc
+      securityContext:
+        runAsUser: 10000
+        runAsGroup: 10000
+        fsGroup: 10000

test/addons/volsync/source/kustomization.yaml

@@ -0,0 +1,8 @@
+# SPDX-FileCopyrightText: The RamenDR authors
+# SPDX-License-Identifier: Apache-2.0
+
+---
+resources:
+- namespace.yaml
+- pvc.yaml
+- deploy.yaml

test/addons/volsync/source/namespace.yaml

@@ -0,0 +1,8 @@
+# SPDX-FileCopyrightText: The RamenDR authors
+# SPDX-License-Identifier: Apache-2.0
+
+---
+apiVersion: v1
+kind: Namespace
+metadata:
+  name: busybox

test/addons/volsync/source/pvc.yaml

@@ -0,0 +1,17 @@
+# SPDX-FileCopyrightText: The RamenDR authors
+# SPDX-License-Identifier: Apache-2.0
+
+---
+apiVersion: v1
+kind: PersistentVolumeClaim
+metadata:
+  name: busybox-pvc
+  namespace: busybox
+  labels:
+    appname: busybox
+spec:
+  accessModes: [ReadWriteOnce]
+  storageClassName: csi-hostpath-sc
+  resources:
+    requests:
+      storage: 1Gi

test/addons/volsync/source/replication-src.yaml

@@ -0,0 +1,22 @@
+# SPDX-FileCopyrightText: The RamenDR authors
+# SPDX-License-Identifier: Apache-2.0
+
+---
+apiVersion: volsync.backube/v1alpha1
+kind: ReplicationSource
+metadata:
+  name: busybox-src
+  namespace: busybox
+spec:
+  sourcePVC: busybox-pvc
+  trigger:
+    manual: replication-1
+  rsyncTLS:
+    keySecret: volsync-rsync-tls-busybox-dst
+    address: volsync-rsync-tls-dst-busybox-dst.busybox.svc.clusterset.local
+    copyMethod: Snapshot
+    volumeSnapshotClassName: csi-hostpath-snapclass
+    moverSecurityContext:
+      runAsUser: 10000
+      runAsGroup: 10000
+      fsGroup: 10000