initialize: only restart networkd once per config

Regression introduced by 9fcf338bf3.

Networkd was erroneously being restarted once per network unit. It
should only restart once for the entire config.

initialize/config.go

@@ -313,6 +313,7 @@ func processUnits(units []system.Unit, root string, um system.UnitManager) error
 	}
 	actions := make([]action, 0, len(units))
 	reload := false
+	restartNetworkd := false
 	for _, unit := range units {
 		dst := unit.Destination(root)
 		if unit.Content != "" {
@@ -349,7 +350,7 @@ func processUnits(units []system.Unit, root string, um system.UnitManager) error
 		}
 
 		if unit.Group() == "network" {
-			actions = append(actions, action{"systemd-networkd.service", "restart"})
+			restartNetworkd = true
 		} else if unit.Command != "" {
 			actions = append(actions, action{unit.Name, unit.Command})
 		}
@@ -361,6 +362,10 @@ func processUnits(units []system.Unit, root string, um system.UnitManager) error
 		}
 	}
 
+	if restartNetworkd {
+		actions = append(actions, action{"systemd-networkd.service", "restart"})
+	}
+
 	for _, action := range actions {
 		log.Printf("Calling unit command '%s %s'", action.command, action.unit)
 		res, err := um.RunUnitCommand(action.command, action.unit)

initialize/config_test.go

@@ -384,10 +384,15 @@ type TestUnitManager struct {
 	enabled  []string
 	masked   []string
 	unmasked []string
-	commands map[string]string
+	commands []UnitAction
 	reload   bool
 }
 
+type UnitAction struct {
+	unit    string
+	command string
+}
+
 func (tum *TestUnitManager) PlaceUnit(unit *system.Unit, dst string) error {
 	tum.placed = append(tum.placed, unit.Name)
 	return nil
@@ -397,8 +402,7 @@ func (tum *TestUnitManager) EnableUnitFile(unit string, runtime bool) error {
 	return nil
 }
 func (tum *TestUnitManager) RunUnitCommand(command, unit string) (string, error) {
-	tum.commands = make(map[string]string)
-	tum.commands[unit] = command
+	tum.commands = append(tum.commands, UnitAction{unit, command})
 	return "", nil
 }
 func (tum *TestUnitManager) DaemonReload() error {
@@ -438,7 +442,7 @@ func TestProcessUnits(t *testing.T) {
 	if err := processUnits(units, "", tum); err != nil {
 		t.Fatalf("unexpected error calling processUnits: %v", err)
 	}
-	if _, ok := tum.commands["systemd-networkd.service"]; !ok {
+	if len(tum.commands) != 1 || (tum.commands[0] != UnitAction{"systemd-networkd.service", "restart"}) {
 		t.Errorf("expected systemd-networkd.service to be reloaded!")
 	}