cinder-csi-plugin: Handle potentially unset volCtx arg

Signed-off-by: Stephen Finucane <[email protected]>

Author: stephenfin

pkg/csi/cinder/controllerserver.go

@@ -1060,10 +1060,10 @@ func getTopology(vol *volumes.Volume, topologyReq *csi.TopologyRequirement, igno
 
 func getCreateVolumeResponse(vol *volumes.Volume, volCtx map[string]string, accessibleTopology []*csi.Topology) *csi.CreateVolumeResponse {
 	var volSrc *csi.VolumeContentSource
+	var resizeRequired bool
 
 	if vol.SnapshotID != "" {
-		volCtx[ResizeRequired] = "true"
-
+		resizeRequired = true
 		volSrc = &csi.VolumeContentSource{
 			Type: &csi.VolumeContentSource_Snapshot{
 				Snapshot: &csi.VolumeContentSource_SnapshotSource{
@@ -1074,8 +1074,7 @@ func getCreateVolumeResponse(vol *volumes.Volume, volCtx map[string]string, acce
 	}
 
 	if vol.SourceVolID != "" {
-		volCtx[ResizeRequired] = "true"
-
+		resizeRequired = true
 		volSrc = &csi.VolumeContentSource{
 			Type: &csi.VolumeContentSource_Volume{
 				Volume: &csi.VolumeContentSource_VolumeSource{
@@ -1086,8 +1085,7 @@ func getCreateVolumeResponse(vol *volumes.Volume, volCtx map[string]string, acce
 	}
 
 	if vol.BackupID != nil && *vol.BackupID != "" {
-		volCtx[ResizeRequired] = "true"
-
+		resizeRequired = true
 		volSrc = &csi.VolumeContentSource{
 			Type: &csi.VolumeContentSource_Snapshot{
 				Snapshot: &csi.VolumeContentSource_SnapshotSource{
@@ -1097,6 +1095,11 @@ func getCreateVolumeResponse(vol *volumes.Volume, volCtx map[string]string, acce
 		}
 	}
 
+	if volCtx == nil {
+		volCtx = map[string]string{}
+	}
+	volCtx[ResizeRequired] = "true"
+
 	resp := &csi.CreateVolumeResponse{
 		Volume: &csi.Volume{
 			VolumeId:           vol.ID,