command/maint: display active maintenance when no args are passed

command/agent/agent.go

@@ -32,8 +32,8 @@ const (
 		"and try again."
 
 	// The ID of the faux health checks for maintenance mode
-	serviceMaintCheckPrefix = "_service_maintenance"
-	nodeMaintCheckID        = "_node_maintenance"
+	ServiceMaintCheckPrefix = "_service_maintenance"
+	NodeMaintCheckID        = "_node_maintenance"
 
 	// Default reasons for node/service maintenance mode
 	defaultNodeMaintReason = "Maintenance mode is enabled for this node, " +
@@ -1028,7 +1028,7 @@ func (a *Agent) unloadChecks() error {
 
 // serviceMaintCheckID returns the ID of a given service's maintenance check
 func serviceMaintCheckID(serviceID string) string {
-	return fmt.Sprintf("%s:%s", serviceMaintCheckPrefix, serviceID)
+	return fmt.Sprintf("%s:%s", ServiceMaintCheckPrefix, serviceID)
 }
 
 // EnableServiceMaintenance will register a false health check against the given
@@ -1089,7 +1089,7 @@ func (a *Agent) DisableServiceMaintenance(serviceID string) error {
 // EnableNodeMaintenance places a node into maintenance mode.
 func (a *Agent) EnableNodeMaintenance(reason string) {
 	// Ensure node maintenance is not already enabled
-	if _, ok := a.state.Checks()[nodeMaintCheckID]; ok {
+	if _, ok := a.state.Checks()[NodeMaintCheckID]; ok {
 		return
 	}
 
@@ -1101,7 +1101,7 @@ func (a *Agent) EnableNodeMaintenance(reason string) {
 	// Create and register the node maintenance check
 	check := &structs.HealthCheck{
 		Node:    a.config.NodeName,
-		CheckID: nodeMaintCheckID,
+		CheckID: NodeMaintCheckID,
 		Name:    "Node Maintenance Mode",
 		Notes:   reason,
 		Status:  structs.HealthCritical,
@@ -1112,9 +1112,9 @@ func (a *Agent) EnableNodeMaintenance(reason string) {
 
 // DisableNodeMaintenance removes a node from maintenance mode
 func (a *Agent) DisableNodeMaintenance() {
-	if _, ok := a.state.Checks()[nodeMaintCheckID]; !ok {
+	if _, ok := a.state.Checks()[NodeMaintCheckID]; !ok {
 		return
 	}
-	a.RemoveCheck(nodeMaintCheckID, true)
+	a.RemoveCheck(NodeMaintCheckID, true)
 	a.logger.Printf("[INFO] agent: node left maintenance mode")
 }

command/maint.go

@@ -6,6 +6,7 @@ import (
 	"strings"
 
 	"github.com/hashicorp/consul/api"
+	"github.com/hashicorp/consul/command/agent"
 	"github.com/mitchellh/cli"
 )
 
@@ -37,6 +38,9 @@ Usage: consul maint [options]
   "-service" argument, this behavior can be changed to enable or disable
   only a specific service.
 
+  If no arguments are given, the agent's maintenance status will be shown.
+  This will return blank if nothing is currently under maintenance.
+
 Options:
 
   -enable                    Enable maintenance mode.
@@ -70,17 +74,7 @@ func (c *MaintCommand) Run(args []string) int {
 		return 1
 	}
 
-	// Print help if no args given
-	if len(args) == 0 {
-		c.Ui.Error(c.Help())
-		return 1
-	}
-
 	// Ensure we don't have conflicting args
-	if !enable && !disable {
-		c.Ui.Error("One of -enable or -disable must be specified")
-		return 1
-	}
 	if enable && disable {
 		c.Ui.Error("Only one of -enable or -disable may be provided")
 		return 1
@@ -99,16 +93,42 @@ func (c *MaintCommand) Run(args []string) int {
 		c.Ui.Error(fmt.Sprintf("Error connecting to Consul agent: %s", err))
 		return 1
 	}
-	agent := client.Agent()
-	if _, err := agent.NodeName(); err != nil {
+	a := client.Agent()
+	nodeName, err := a.NodeName()
+	if err != nil {
 		c.Ui.Error(fmt.Sprintf("Error querying Consul agent: %s", err))
 		return 1
 	}
 
+	if !enable && !disable {
+		// List mode - list nodes/services in maintenance mode
+		checks, err := a.Checks()
+		if err != nil {
+			c.Ui.Output(fmt.Sprintf("Error getting checks: %s", err))
+			return 1
+		}
+
+		for _, check := range checks {
+			if check.CheckID == agent.NodeMaintCheckID {
+				c.Ui.Output("Node:")
+				c.Ui.Output("  Name:   " + nodeName)
+				c.Ui.Output("  Reason: " + check.Notes)
+				c.Ui.Output("")
+			} else if strings.HasPrefix(check.CheckID, agent.ServiceMaintCheckPrefix) {
+				c.Ui.Output("Service:")
+				c.Ui.Output("  ID:     " + check.ServiceID)
+				c.Ui.Output("  Reason: " + check.Notes)
+				c.Ui.Output("")
+			}
+		}
+
+		return 0
+	}
+
 	if enable {
 		// Enable node maintenance
 		if serviceID == "" {
-			if err := agent.EnableNodeMaintenance(reason); err != nil {
+			if err := a.EnableNodeMaintenance(reason); err != nil {
 				c.Ui.Error(fmt.Sprintf("Error enabling node maintenance: %s", err))
 				return 1
 			}
@@ -117,7 +137,7 @@ func (c *MaintCommand) Run(args []string) int {
 		}
 
 		// Enable service maintenance
-		if err := agent.EnableServiceMaintenance(serviceID, reason); err != nil {
+		if err := a.EnableServiceMaintenance(serviceID, reason); err != nil {
 			c.Ui.Error(fmt.Sprintf("Error enabling service maintenance: %s", err))
 			return 1
 		}
@@ -128,7 +148,7 @@ func (c *MaintCommand) Run(args []string) int {
 	if disable {
 		// Disable node maintenance
 		if serviceID == "" {
-			if err := agent.DisableNodeMaintenance(); err != nil {
+			if err := a.DisableNodeMaintenance(); err != nil {
 				c.Ui.Error(fmt.Sprintf("Error disabling node maintenance: %s", err))
 				return 1
 			}
@@ -137,7 +157,7 @@ func (c *MaintCommand) Run(args []string) int {
 		}
 
 		// Disable service maintenance
-		if err := agent.DisableServiceMaintenance(serviceID); err != nil {
+		if err := a.DisableServiceMaintenance(serviceID); err != nil {
 			c.Ui.Error(fmt.Sprintf("Error disabling service maintenance: %s", err))
 			return 1
 		}

command/maint_test.go

@@ -12,19 +12,6 @@ func TestMaintCommand_implements(t *testing.T) {
 	var _ cli.Command = &MaintCommand{}
 }
 
-func TestMaintCommandRun_NoArgs(t *testing.T) {
-	ui := new(cli.MockUi)
-	c := &MaintCommand{Ui: ui}
-
-	if code := c.Run([]string{}); code != 1 {
-		t.Fatalf("expected return code 1, got %d", code)
-	}
-
-	if strings.TrimSpace(ui.ErrorWriter.String()) != c.Help() {
-		t.Fatalf("bad:\n%s", ui.ErrorWriter.String())
-	}
-}
-
 func TestMaintCommandRun_ConflictingArgs(t *testing.T) {
 	ui := new(cli.MockUi)
 	c := &MaintCommand{Ui: ui}
@@ -38,6 +25,53 @@ func TestMaintCommandRun_ConflictingArgs(t *testing.T) {
 	}
 }
 
+func TestMaintCommandRun_NoArgs(t *testing.T) {
+	a1 := testAgent(t)
+	defer a1.Shutdown()
+
+	// Register the service and put it into maintenance mode
+	service := &structs.NodeService{
+		ID:      "test",
+		Service: "test",
+	}
+	if err := a1.agent.AddService(service, nil, false); err != nil {
+		t.Fatalf("err: %v", err)
+	}
+	if err := a1.agent.EnableServiceMaintenance("test", "broken 1"); err != nil {
+		t.Fatalf("err: %s", err)
+	}
+
+	// Enable node maintenance
+	a1.agent.EnableNodeMaintenance("broken 2")
+
+	// Run consul maint with no args (list mode)
+	ui := new(cli.MockUi)
+	c := &MaintCommand{Ui: ui}
+
+	args := []string{"-http-addr=" + a1.httpAddr}
+	code := c.Run(args)
+	if code != 0 {
+		t.Fatalf("bad: %d. %#v", code, ui.ErrorWriter.String())
+	}
+
+	// Ensure the service shows up in the list
+	out := ui.OutputWriter.String()
+	if !strings.Contains(out, "test") {
+		t.Fatalf("bad:\n%s", out)
+	}
+	if !strings.Contains(out, "broken 1") {
+		t.Fatalf("bad:\n%s", out)
+	}
+
+	// Ensure the node shows up in the list
+	if !strings.Contains(out, a1.config.NodeName) {
+		t.Fatalf("bad:\n%s", out)
+	}
+	if !strings.Contains(out, "broken 2") {
+		t.Fatalf("bad:\n%s", out)
+	}
+}
+
 func TestMaintCommandRun_EnableNodeMaintenance(t *testing.T) {
 	a1 := testAgent(t)
 	defer a1.Shutdown()