Add glide.yaml and vendor deps

vendor/k8s.io/kubernetes/pkg/util/initsystem/initsystem.go

@@ -0,0 +1,99 @@
+/*
+Copyright 2016 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 InitSystem interface {
+	// ServiceStart tries to start a specific service
+	ServiceStart(service string) error
+
+	// ServiceStop tries to stop a specific service
+	ServiceStop(service string) error
+
+	// ServiceExists ensures the service is defined for this init system.
+	ServiceExists(service string) bool
+
+	// ServiceIsEnabled ensures the service is enabled to start on each boot.
+	ServiceIsEnabled(service string) bool
+
+	// ServiceIsActive ensures the service is running, or attempting to run. (crash looping in the case of kubelet)
+	ServiceIsActive(service string) bool
+}
+
+type SystemdInitSystem struct{}
+
+func (sysd SystemdInitSystem) ServiceStart(service string) error {
+	args := []string{"start", service}
+	_, err := exec.Command("systemctl", args...).Output()
+	return err
+}
+
+func (sysd SystemdInitSystem) ServiceStop(service string) error {
+	args := []string{"stop", service}
+	_, err := exec.Command("systemctl", args...).Output()
+	return err
+}
+
+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...).Output()
+	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 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
+	}
+	return nil, fmt.Errorf("no supported init system detected, skipping checking for services")
+}