Handle missing backups

util/util.go

@@ -7,13 +7,14 @@ import (
 	"strings"
 
 	"github.com/coreos/go-semver/semver"
-	"github.com/rancher/types/apis/management.cattle.io/v3"
+	v3 "github.com/rancher/types/apis/management.cattle.io/v3"
 )
 
 const (
 	WorkerThreads = 50
-
-	SupportedSyncToolsVersion = "0.1.22"
+	// this should be kept at the latest version of rke released with
+	// rancher 2.2.0.
+	SupportedSyncToolsVersion = "0.1.25"
 )
 
 func StrToSemVer(version string) (*semver.Version, error) {
@@ -115,6 +116,11 @@ func GetDefaultRKETools() string {
 	return v3.AllK8sVersions[v3.DefaultK8s].Alpine
 }
 
+// with rancher 2.2.0 and rke 0.2.0, etcdbackup was completely refactored
+// and the interface for the rke-tools backup command changed significantly.
+// This function is used to check the the release rke-tools version to choose
+// between the new backup or the legacy backup code paths.
+// The released version of rke-tools should be set in the const SupportedSyncToolsVersion
 func IsRancherBackupSupported(image string) bool {
 	v := strings.Split(image, ":")
 	last := v[len(v)-1]