Check profile, node name to prevent duplication

Check profile and node name before add to prevent conflict with
machine name on multinode cluster.

Author: daehyeok

Diff for: cmd/minikube/cmd/start.go

@@ -178,6 +178,7 @@ func runStart(cmd *cobra.Command, args []string) {
 		upgradeExistingConfig(existing)
 	}
 
+	validateProfileName(existing)
 	validateSpecifiedDriver(existing)
 	validateKubernetesVersion(existing)
 
@@ -638,6 +639,29 @@ func hostDriver(existing *config.ClusterConfig) string {
 	return h.Driver.DriverName()
 }
 
+// validateProfileName makes sure that new profile name not duplicated with any of machine names in existing multi-node clusters.
+func validateProfileName(existing *config.ClusterConfig) {
+	if existing != nil {
+		return
+	}
+
+	profiles, err := config.ListProfilesLight()
+	if err != nil {
+		exit.Message(reason.InternalListConfig, "Unable to list profiles: {{.error}}", out.V{"error": err})
+	}
+	for _, p := range profiles {
+		for _, n := range p.Config.Nodes {
+			machineName := config.MachineName(*p.Config, n)
+			if ClusterFlagValue() == machineName {
+				out.WarningT("Profile name '{{.name}}' is duplicated with machine name '{{.machine}}' in profile '{{.profile}}'", out.V{"name": ClusterFlagValue(),
+					"machine": machineName,
+					"profile": p.Name})
+				exit.Message(reason.Usage, "Profile name should be unique")
+			}
+		}
+	}
+}
+
 // validateSpecifiedDriver makes sure that if a user has passed in a driver
 // it matches the existing cluster if there is one
 func validateSpecifiedDriver(existing *config.ClusterConfig) {

Diff for: pkg/minikube/config/profile.go

@@ -223,7 +223,25 @@ func ListProfiles(miniHome ...string) (validPs []*Profile, inValidPs []*Profile,
 	return validPs, inValidPs, nil
 }
 
-// removeDupes removes duplicates
+// ListProfilesLight returns profiles in minikube home dir
+// Unlike `ListProfiles` this function doens't try to get profile from container
+func ListProfilesLight(miniHome ...string) (ps []*Profile, err error) {
+	// try to get profiles list based on left over evidences such as directory
+	pDirs, err := profileDirs(miniHome...)
+	if err != nil {
+		return nil, err
+	}
+
+	for _, n := range pDirs {
+		p, err := LoadProfile(n, miniHome...)
+		if err == nil && p.IsValid() {
+			ps = append(ps, p)
+		}
+	}
+	return ps, nil
+}
+
+// removeDupes removes duplipcates
 func removeDupes(profiles []string) []string {
 	// Use map to record duplicates as we find them.
 	seen := map[string]bool{}
@@ -291,7 +309,7 @@ func ProfileFolderPath(profile string, miniHome ...string) string {
 // MachineName returns the name of the machine, as seen by the hypervisor given the cluster and node names
 func MachineName(cc ClusterConfig, n Node) string {
 	// For single node cluster, default to back to old naming
-	if len(cc.Nodes) == 1 || n.ControlPlane {
+	if (len(cc.Nodes) == 1 && cc.Nodes[0].Name == n.Name) || n.ControlPlane {
 		return cc.Name
 	}
 	return fmt.Sprintf("%s-%s", cc.Name, n.Name)

Diff for: pkg/minikube/machine/cluster_test.go

@@ -146,10 +146,8 @@ func TestStartHostExists(t *testing.T) {
 	mc := defaultClusterConfig
 	mc.Name = ih.Name
 
-	n := config.Node{Name: ih.Name}
-
 	// This should pass without calling Create because the host exists already.
-	h, _, err := StartHost(api, &mc, &n)
+	h, _, err := StartHost(api, &mc, &(mc.Nodes[0]))
 	if err != nil {
 		t.Fatalf("Error starting host: %v", err)
 	}

Diff for: pkg/minikube/node/node.go

@@ -38,6 +38,20 @@ const (
 
 // Add adds a new node config to an existing cluster.
 func Add(cc *config.ClusterConfig, n config.Node, delOnFail bool) error {
+	profiles, err := config.ListProfilesLight()
+	if err != nil {
+		return err
+	}
+
+	machineName := config.MachineName(*cc, n)
+	for _, p := range profiles {
+		for _, existNode := range p.Config.Nodes {
+			if machineName == config.MachineName(*p.Config, existNode) {
+				return errors.Errorf("Node %s already exists in %s profile", machineName, p.Name)
+			}
+		}
+	}
+
 	if err := config.SaveNode(cc, &n); err != nil {
 		return errors.Wrap(err, "save node")
 	}

Diff for: test/integration/multinode_test.go

@@ -48,6 +48,7 @@ func TestMultiNode(t *testing.T) {
 			{"DeleteNode", validateDeleteNodeFromMultiNode},
 			{"StopMultiNode", validateStopMultiNodeCluster},
 			{"RestartMultiNode", validateRestartMultiNodeCluster},
+			{"ValidateNameConflict", validatNameConflict},
 		}
 		for _, tc := range tests {
 			tc := tc
@@ -308,3 +309,39 @@ func validateDeleteNodeFromMultiNode(ctx context.Context, t *testing.T, profile
 		t.Errorf("expected 2 nodes Ready status to be True, got %v", rr.Output())
 	}
 }
+
+func validatNameConflict(ctx context.Context, t *testing.T, profile string) {
+	rr, err := Run(t, exec.CommandContext(ctx, Target(), "node", "list", "-p", profile))
+	if err != nil {
+		t.Errorf("failed to run node list. args %q : %v", rr.Command(), err)
+	}
+	curNodeNum := strings.Count(rr.Stdout.String(), profile)
+
+	// Start new profile. It's expected failture
+	profileName := fmt.Sprintf("%s-m0%d", profile, curNodeNum)
+	startArgs := append([]string{"start", "-p", profileName}, StartArgs()...)
+	rr, err = Run(t, exec.CommandContext(ctx, Target(), startArgs...))
+	if err == nil {
+		t.Errorf("expected start profile command to fail. args %q", rr.Command())
+	}
+
+	// Start new profile temporary profile to conflict node name.
+	profileName = fmt.Sprintf("%s-m0%d", profile, curNodeNum+1)
+	startArgs = append([]string{"start", "-p", profileName}, StartArgs()...)
+	rr, err = Run(t, exec.CommandContext(ctx, Target(), startArgs...))
+	if err != nil {
+		t.Errorf("failed to start profile. args %q : %v", rr.Command(), err)
+	}
+
+	// Add a node to the current cluster. It's expected failture
+	addArgs := []string{"node", "add", "-p", profile}
+	rr, err = Run(t, exec.CommandContext(ctx, Target(), addArgs...))
+	if err == nil {
+		t.Errorf("expected add node command to fail fail. args %q : %v", rr.Command(), err)
+	}
+
+	rr, err = Run(t, exec.CommandContext(ctx, Target(), "delete", "-p", profileName))
+	if err != nil {
+		t.Logf("failed to clean temporary profile. args %q : %v", rr.Command(), err)
+	}
+}