cluster: nightly version could not be compared (#1702)

pkg/cluster/task/builder.go

@@ -24,9 +24,11 @@ import (
 	operator "github.com/pingcap/tiup/pkg/cluster/operation"
 	"github.com/pingcap/tiup/pkg/cluster/spec"
 	"github.com/pingcap/tiup/pkg/crypto"
+	"github.com/pingcap/tiup/pkg/environment"
 	"github.com/pingcap/tiup/pkg/logger/log"
 	"github.com/pingcap/tiup/pkg/meta"
 	"github.com/pingcap/tiup/pkg/proxy"
+	"github.com/pingcap/tiup/pkg/utils"
 )
 
 // Builder is used to build TiUP task
@@ -230,10 +232,31 @@ func (b *Builder) BackupComponent(component, fromVer string, host, deployDir str
 
 // InitConfig appends a CopyComponent task to the current task collection
 func (b *Builder) InitConfig(clusterName, clusterVersion string, specManager *spec.SpecManager, inst spec.Instance, deployUser string, ignoreCheck bool, paths meta.DirPaths) *Builder {
+	// get nightly version
+	var componentVersion utils.Version
+	meta := specManager.NewMetadata()
+
+	//  full version
+	componentVersion = utils.Version(clusterVersion)
+	if err := specManager.Metadata(clusterName, meta); err == nil {
+		// get nightly version
+		if clusterVersion == utils.NightlyVersionAlias {
+			componentVersion, _, err = environment.GlobalEnv().V1Repository().LatestNightlyVersion(inst.ComponentName())
+			if err != nil {
+				componentVersion = utils.Version(clusterVersion)
+			}
+		}
+
+		// dm cluster does not require a full nightly version
+		if meta.GetTopology().Type() == spec.TopoTypeDM {
+			componentVersion = utils.Version(clusterVersion)
+		}
+	}
+
 	b.tasks = append(b.tasks, &InitConfig{
 		specManager:    specManager,
 		clusterName:    clusterName,
-		clusterVersion: clusterVersion,
+		clusterVersion: string(componentVersion),
 		instance:       inst,
 		deployUser:     deployUser,
 		ignoreCheck:    ignoreCheck,