Use system calls to manage Windows services

cmd/kubeadm/app/preflight/checks.go

@@ -143,8 +143,8 @@ func (sc ServiceCheck) Check() (warnings, errorList []error) {
 
 	if !initSystem.ServiceIsEnabled(sc.Service) {
 		warnings = append(warnings,
-			errors.Errorf("%s service is not enabled, please run 'systemctl enable %s.service'",
+			errors.Errorf("%s service is not enabled, please run '%s'",
-				sc.Service, sc.Service))
+				sc.Service, initSystem.EnableCommand(sc.Service)))
 	}
 
 	if sc.CheckIfActive && !initSystem.ServiceIsActive(sc.Service) {

pkg/util/initsystem/BUILD

@@ -7,12 +7,19 @@ load(
 
 go_library(
     name = "go_default_library",
-    srcs = ["initsystem.go"],
+    srcs = [
+        "initsystem.go",
+        "initsystem_unix.go",
+        "initsystem_windows.go",
+    ],
     importpath = "k8s.io/kubernetes/pkg/util/initsystem",
-    deps = [
+    deps = select({
+        "@io_bazel_rules_go//go/platform:windows": [
             "//vendor/golang.org/x/sys/windows/svc:go_default_library",
             "//vendor/golang.org/x/sys/windows/svc/mgr:go_default_library",
         ],
+        "//conditions:default": [],
+    }),
 )
 
 filegroup(

pkg/util/initsystem/initsystem.go

@@ -16,12 +16,6 @@ limitations under the License.
 
 package initsystem
 
-import (
-	"fmt"
-	"os/exec"
-	"strings"
-)
-
 type InitSystem interface {
 	// return a string describing how to enable a service
 	EnableCommand(service string) string
@@ -44,202 +38,3 @@ type InitSystem interface {
 	// ServiceIsActive ensures the service is running, or attempting to run. (crash looping in the case of kubelet)
 	ServiceIsActive(service string) bool
 }
-
-type OpenRCInitSystem struct{}
-
-func (openrc OpenRCInitSystem) ServiceStart(service string) error {
-	args := []string{service, "start"}
-	return exec.Command("rc-service", args...).Run()
-}
-
-func (openrc OpenRCInitSystem) ServiceStop(service string) error {
-	args := []string{service, "stop"}
-	return exec.Command("rc-service", args...).Run()
-}
-
-func (openrc OpenRCInitSystem) ServiceRestart(service string) error {
-	args := []string{service, "restart"}
-	return exec.Command("rc-service", args...).Run()
-}
-
-// openrc writes to stderr if a service is not found or not enabled
-// this is in contrast to systemd which only writes to stdout.
-// Hence, we use the Combinedoutput, and ignore the error.
-func (openrc OpenRCInitSystem) ServiceExists(service string) bool {
-	args := []string{service, "status"}
-	outBytes, _ := exec.Command("rc-service", args...).CombinedOutput()
-	if strings.Contains(string(outBytes), "does not exist") {
-		return false
-	}
-	return true
-}
-
-func (openrc OpenRCInitSystem) ServiceIsEnabled(service string) bool {
-	args := []string{"show", "default"}
-	outBytes, _ := exec.Command("rc-update", args...).Output()
-	if strings.Contains(string(outBytes), service) {
-		return true
-	}
-	return false
-}
-
-func (openrc OpenRCInitSystem) ServiceIsActive(service string) bool {
-	args := []string{service, "status"}
-	outBytes, _ := exec.Command("rc-service", args...).Output()
-	if strings.Contains(string(outBytes), "stopped") {
-		return false
-	}
-	return true
-}
-
-func (openrc OpenRCInitSystem) EnableCommand(service string) string {
-	return fmt.Sprintf("rc-update add %s default", service)
-}
-
-type SystemdInitSystem struct{}
-
-func (sysd SystemdInitSystem) EnableCommand(service string) string {
-	return fmt.Sprintf("systemctl enable %s.service", service)
-}
-
-func (sysd SystemdInitSystem) reloadSystemd() error {
-	if err := exec.Command("systemctl", "daemon-reload").Run(); err != nil {
-		return fmt.Errorf("failed to reload systemd: %v", err)
-	}
-	return nil
-}
-
-func (sysd SystemdInitSystem) ServiceStart(service string) error {
-	// Before we try to start any service, make sure that systemd is ready
-	if err := sysd.reloadSystemd(); err != nil {
-		return err
-	}
-	args := []string{"start", service}
-	return exec.Command("systemctl", args...).Run()
-}
-
-func (sysd SystemdInitSystem) ServiceRestart(service string) error {
-	// Before we try to restart any service, make sure that systemd is ready
-	if err := sysd.reloadSystemd(); err != nil {
-		return err
-	}
-	args := []string{"restart", service}
-	return exec.Command("systemctl", args...).Run()
-}
-
-func (sysd SystemdInitSystem) ServiceStop(service string) error {
-	args := []string{"stop", service}
-	return exec.Command("systemctl", args...).Run()
-}
-
-func (sysd SystemdInitSystem) ServiceExists(service string) bool {
-	args := []string{"status", service}
-	outBytes, _ := exec.Command("systemctl", args...).Output()
-	output := string(outBytes)
-	if strings.Contains(output, "Loaded: not-found") {
-		return false
-	}
-	return true
-}
-
-func (sysd SystemdInitSystem) ServiceIsEnabled(service string) bool {
-	args := []string{"is-enabled", service}
-	err := exec.Command("systemctl", args...).Run()
-	if err != nil {
-		return false
-	}
-	return true
-}
-
-// ServiceIsActive will check is the service is "active". In the case of
-// crash looping services (kubelet in our case) status will return as
-// "activating", so we will consider this active as well.
-func (sysd SystemdInitSystem) ServiceIsActive(service string) bool {
-	args := []string{"is-active", service}
-	// Ignoring error here, command returns non-0 if in "activating" status:
-	outBytes, _ := exec.Command("systemctl", args...).Output()
-	output := strings.TrimSpace(string(outBytes))
-	if output == "active" || output == "activating" {
-		return true
-	}
-	return false
-}
-
-// WindowsInitSystem is the windows implementation of InitSystem
-type WindowsInitSystem struct{}
-
-func (sysd WindowsInitSystem) EnableCommand(service string) string {
-	return fmt.Sprintf("Set-Service '%s' -StartupType Automatic", service)
-}
-
-func (sysd WindowsInitSystem) ServiceStart(service string) error {
-	args := []string{"Start-Service", service}
-	err := exec.Command("powershell", args...).Run()
-	return err
-}
-
-func (sysd WindowsInitSystem) ServiceRestart(service string) error {
-	if err := sysd.ServiceStop(service); err != nil {
-		return fmt.Errorf("couldn't stop service: %v", err)
-	}
-	if err := sysd.ServiceStart(service); err != nil {
-		return fmt.Errorf("couldn't start service: %v", err)
-	}
-	return nil
-}
-
-func (sysd WindowsInitSystem) ServiceStop(service string) error {
-	args := []string{"Stop-Service", service}
-	err := exec.Command("powershell", args...).Run()
-	return err
-}
-
-func (sysd WindowsInitSystem) ServiceExists(service string) bool {
-	args := []string{"Get-Service", service}
-	err := exec.Command("powershell", args...).Run()
-	if err != nil {
-		return false
-	}
-	return true
-
-}
-
-func (sysd WindowsInitSystem) ServiceIsEnabled(service string) bool {
-	args := []string{"Get-Service", service + "| select -property starttype"}
-	outBytes, _ := exec.Command("powershell", args...).Output()
-	output := strings.TrimSpace(string(outBytes))
-	if strings.Contains(output, "Automatic") {
-		return true
-	}
-	return false
-}
-
-func (sysd WindowsInitSystem) ServiceIsActive(service string) bool {
-	args := []string{"Get-Service", service + "| select -property status"}
-	outBytes, _ := exec.Command("powershell", args...).Output()
-	output := strings.TrimSpace(string(outBytes))
-	if strings.Contains(output, "Running") {
-		return true
-	}
-	return false
-}
-
-// GetInitSystem returns an InitSystem for the current system, or nil
-// if we cannot detect a supported init system for pre-flight checks.
-// This indicates we will skip init system checks, not an error.
-func GetInitSystem() (InitSystem, error) {
-	// Assume existence of systemctl in path implies this is a systemd system:
-	_, err := exec.LookPath("systemctl")
-	if err == nil {
-		return &SystemdInitSystem{}, nil
-	}
-	_, err = exec.LookPath("openrc")
-	if err == nil {
-		return &OpenRCInitSystem{}, nil
-	}
-	_, err = exec.LookPath("wininit.exe")
-	if err == nil {
-		return &WindowsInitSystem{}, nil
-	}
-	return nil, fmt.Errorf("no supported init system detected, skipping checking for services")
-}

pkg/util/initsystem/initsystem_unix.go

@@ -0,0 +1,162 @@
+// +build !windows
+
+/*
+Copyright 2017 The Kubernetes Authors.
+
+Licensed under the Apache License, Version 2.0 (the "License");
+you may not use this file except in compliance with the License.
+You may obtain a copy of the License at
+
+    http://www.apache.org/licenses/LICENSE-2.0
+
+Unless required by applicable law or agreed to in writing, software
+distributed under the License is distributed on an "AS IS" BASIS,
+WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+See the License for the specific language governing permissions and
+limitations under the License.
+*/
+
+package initsystem
+
+import (
+	"fmt"
+	"os/exec"
+	"strings"
+)
+
+type OpenRCInitSystem struct{}
+
+func (openrc OpenRCInitSystem) ServiceStart(service string) error {
+	args := []string{service, "start"}
+	return exec.Command("rc-service", args...).Run()
+}
+
+func (openrc OpenRCInitSystem) ServiceStop(service string) error {
+	args := []string{service, "stop"}
+	return exec.Command("rc-service", args...).Run()
+}
+
+func (openrc OpenRCInitSystem) ServiceRestart(service string) error {
+	args := []string{service, "restart"}
+	return exec.Command("rc-service", args...).Run()
+}
+
+// openrc writes to stderr if a service is not found or not enabled
+// this is in contrast to systemd which only writes to stdout.
+// Hence, we use the Combinedoutput, and ignore the error.
+func (openrc OpenRCInitSystem) ServiceExists(service string) bool {
+	args := []string{service, "status"}
+	outBytes, _ := exec.Command("rc-service", args...).CombinedOutput()
+	if strings.Contains(string(outBytes), "does not exist") {
+		return false
+	}
+	return true
+}
+
+func (openrc OpenRCInitSystem) ServiceIsEnabled(service string) bool {
+	args := []string{"show", "default"}
+	outBytes, _ := exec.Command("rc-update", args...).Output()
+	if strings.Contains(string(outBytes), service) {
+		return true
+	}
+	return false
+}
+
+func (openrc OpenRCInitSystem) ServiceIsActive(service string) bool {
+	args := []string{service, "status"}
+	outBytes, _ := exec.Command("rc-service", args...).Output()
+	if strings.Contains(string(outBytes), "stopped") {
+		return false
+	}
+	return true
+}
+
+func (openrc OpenRCInitSystem) EnableCommand(service string) string {
+	return fmt.Sprintf("rc-update add %s default", service)
+}
+
+type SystemdInitSystem struct{}
+
+func (sysd SystemdInitSystem) EnableCommand(service string) string {
+	return fmt.Sprintf("systemctl enable %s.service", service)
+}
+
+func (sysd SystemdInitSystem) reloadSystemd() error {
+	if err := exec.Command("systemctl", "daemon-reload").Run(); err != nil {
+		return fmt.Errorf("failed to reload systemd: %v", err)
+	}
+	return nil
+}
+
+func (sysd SystemdInitSystem) ServiceStart(service string) error {
+	// Before we try to start any service, make sure that systemd is ready
+	if err := sysd.reloadSystemd(); err != nil {
+		return err
+	}
+	args := []string{"start", service}
+	return exec.Command("systemctl", args...).Run()
+}
+
+func (sysd SystemdInitSystem) ServiceRestart(service string) error {
+	// Before we try to restart any service, make sure that systemd is ready
+	if err := sysd.reloadSystemd(); err != nil {
+		return err
+	}
+	args := []string{"restart", service}
+	return exec.Command("systemctl", args...).Run()
+}
+
+func (sysd SystemdInitSystem) ServiceStop(service string) error {
+	args := []string{"stop", service}
+	return exec.Command("systemctl", args...).Run()
+}
+
+func (sysd SystemdInitSystem) ServiceExists(service string) bool {
+	args := []string{"status", service}
+	outBytes, _ := exec.Command("systemctl", args...).Output()
+	output := string(outBytes)
+	if strings.Contains(output, "Loaded: not-found") {
+		return false
+	}
+	return true
+}
+
+func (sysd SystemdInitSystem) ServiceIsEnabled(service string) bool {
+	args := []string{"is-enabled", service}
+	err := exec.Command("systemctl", args...).Run()
+	if err != nil {
+		return false
+	}
+	return true
+}
+
+// ServiceIsActive will check is the service is "active". In the case of
+// crash looping services (kubelet in our case) status will return as
+// "activating", so we will consider this active as well.
+func (sysd SystemdInitSystem) ServiceIsActive(service string) bool {
+	args := []string{"is-active", service}
+	// Ignoring error here, command returns non-0 if in "activating" status:
+	outBytes, _ := exec.Command("systemctl", args...).Output()
+	output := strings.TrimSpace(string(outBytes))
+	if output == "active" || output == "activating" {
+		return true
+	}
+	return false
+}
+
+// GetInitSystem returns an InitSystem for the current system, or nil
+// if we cannot detect a supported init system.
+// This indicates we will skip init system checks, not an error.
+func GetInitSystem() (InitSystem, error) {
+	// Assume existence of systemctl in path implies this is a systemd system:
+	_, err := exec.LookPath("systemctl")
+	if err == nil {
+		return &SystemdInitSystem{}, nil
+	}
+	_, err = exec.LookPath("openrc")
+	if err == nil {
+		return &OpenRCInitSystem{}, nil
+	}
+
+	return nil, fmt.Errorf("no supported init system detected, skipping checking for services")
+}

pkg/util/initsystem/initsystem_windows.go

@@ -0,0 +1,238 @@
+// +build windows
+
+/*
+Copyright 2017 The Kubernetes Authors.
+
+Licensed under the Apache License, Version 2.0 (the "License");
+you may not use this file except in compliance with the License.
+You may obtain a copy of the License at
+
+    http://www.apache.org/licenses/LICENSE-2.0
+
+Unless required by applicable law or agreed to in writing, software
+distributed under the License is distributed on an "AS IS" BASIS,
+WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+See the License for the specific language governing permissions and
+limitations under the License.
+*/
+
+package initsystem
+
+import (
+	"fmt"
+	"time"
+
+	"golang.org/x/sys/windows/svc"
+	"golang.org/x/sys/windows/svc/mgr"
+)
+
+// WindowsInitSystem is the windows implementation of InitSystem
+type WindowsInitSystem struct{}
+
+func (sysd WindowsInitSystem) EnableCommand(service string) string {
+	return fmt.Sprintf("Set-Service '%s' -StartupType Automatic", service)
+}
+
+// Following Windows documentation: https://docs.microsoft.com/en-us/windows/desktop/Services/starting-a-service
+func (sysd WindowsInitSystem) ServiceStart(service string) error {
+	m, err := mgr.Connect()
+	if err != nil {
+		return err
+	}
+	defer m.Disconnect()
+
+	s, err := m.OpenService(service)
+	if err != nil {
+		return fmt.Errorf("could not access service %s: %v", service, err)
+	}
+	defer s.Close()
+
+	// Check if service is already started
+	status, err := s.Query()
+	if err != nil {
+		return fmt.Errorf("could not query service %s: %v", service, err)
+	}
+
+	if status.State != svc.Stopped && status.State != svc.StopPending {
+		return nil
+	}
+
+	timeout := time.Now().Add(10 * time.Second)
+	for status.State != svc.Stopped {
+		if timeout.Before(time.Now()) {
+			return fmt.Errorf("timeout waiting for %s service to stop", service)
+		}
+		time.Sleep(300 * time.Millisecond)
+		status, err = s.Query()
+		if err != nil {
+			return fmt.Errorf("could not retrieve %s service status: %v", service, err)
+		}
+	}
+
+	// Start the service
+	err = s.Start("is", "manual-started")
+	if err != nil {
+		return fmt.Errorf("could not start service %s: %v", service, err)
+	}
+
+	// Check that the start was successful
+	status, err = s.Query()
+	if err != nil {
+		return fmt.Errorf("could not query service %s: %v", service, err)
+	}
+	timeout = time.Now().Add(10 * time.Second)
+	for status.State != svc.Running {
+		if timeout.Before(time.Now()) {
+			return fmt.Errorf("timeout waiting for %s service to start", service)
+		}
+		time.Sleep(300 * time.Millisecond)
+		status, err = s.Query()
+		if err != nil {
+			return fmt.Errorf("could not retrieve %s service status: %v", service, err)
+		}
+	}
+	return nil
+}
+
+func (sysd WindowsInitSystem) ServiceRestart(service string) error {
+	if err := sysd.ServiceStop(service); err != nil {
+		return fmt.Errorf("couldn't stop service %s: %v", service, err)
+	}
+	if err := sysd.ServiceStart(service); err != nil {
+		return fmt.Errorf("couldn't start service %s: %v", service, err)
+	}
+
+	return nil
+}
+
+// Following Windows documentation: https://docs.microsoft.com/en-us/windows/desktop/Services/stopping-a-service
+func (sysd WindowsInitSystem) ServiceStop(service string) error {
+	m, err := mgr.Connect()
+	if err != nil {
+		return err
+	}
+	defer m.Disconnect()
+
+	s, err := m.OpenService(service)
+	if err != nil {
+		return fmt.Errorf("could not access service %s: %v", service, err)
+	}
+	defer s.Close()
+
+	// Check if service is already stopped
+	status, err := s.Query()
+	if err != nil {
+		return fmt.Errorf("could not query service %s: %v", service, err)
+	}
+
+	if status.State == svc.Stopped {
+		return nil
+	}
+
+	// If StopPending, check that service eventually stops
+	if status.State == svc.StopPending {
+		timeout := time.Now().Add(10 * time.Second)
+		for status.State != svc.Stopped {
+			if timeout.Before(time.Now()) {
+				return fmt.Errorf("timeout waiting for %s service to stop", service)
+			}
+			time.Sleep(300 * time.Millisecond)
+			status, err = s.Query()
+			if err != nil {
+				return fmt.Errorf("could not retrieve %s service status: %v", service, err)
+			}
+		}
+		return nil
+	}
+
+	// Stop the service
+	status, err = s.Control(svc.Stop)
+	if err != nil {
+		return fmt.Errorf("could not stop service %s: %v", service, err)
+	}
+
+	// Check that the stop was successful
+	status, err = s.Query()
+	if err != nil {
+		return fmt.Errorf("could not query service %s: %v", service, err)
+	}
+	timeout := time.Now().Add(10 * time.Second)
+	for status.State != svc.Stopped {
+		if timeout.Before(time.Now()) {
+			return fmt.Errorf("timeout waiting for %s service to stop", service)
+		}
+		time.Sleep(300 * time.Millisecond)
+		status, err = s.Query()
+		if err != nil {
+			return fmt.Errorf("could not retrieve %s service status: %v", service, err)
+		}
+	}
+	return nil
+}
+
+func (sysd WindowsInitSystem) ServiceExists(service string) bool {
+	m, err := mgr.Connect()
+	if err != nil {
+		return false
+	}
+	defer m.Disconnect()
+	s, err := m.OpenService(service)
+	if err != nil {
+		return false
+	}
+	defer s.Close()
+
+	return true
+}
+
+func (sysd WindowsInitSystem) ServiceIsEnabled(service string) bool {
+	m, err := mgr.Connect()
+	if err != nil {
+		return false
+	}
+	defer m.Disconnect()
+
+	s, err := m.OpenService(service)
+	if err != nil {
+		return false
+	}
+	defer s.Close()
+
+	c, err := s.Config()
+	if err != nil {
+		return false
+	}
+
+	return c.StartType != mgr.StartDisabled
+}
+
+func (sysd WindowsInitSystem) ServiceIsActive(service string) bool {
+	m, err := mgr.Connect()
+	if err != nil {
+		return false
+	}
+	defer m.Disconnect()
+	s, err := m.OpenService(service)
+	if err != nil {
+		return false
+	}
+	defer s.Close()
+
+	status, err := s.Query()
+	if err != nil {
+		return false
+	}
+	return status.State == svc.Running
+}
+
+// GetInitSystem returns an InitSystem for the current system, or nil
+// if we cannot detect a supported init system.
+// This indicates we will skip init system checks, not an error.
+func GetInitSystem() (InitSystem, error) {
+	m, err := mgr.Connect()
+	if err != nil {
+		return nil, fmt.Errorf("no supported init system detected: %v", err)
+	}
+	defer m.Disconnect()
+	return &WindowsInitSystem{}, nil
+}