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100 lines
3.1 KiB
Go
100 lines
3.1 KiB
Go
/*
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Copyright 2016 The Kubernetes Authors.
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Licensed under the Apache License, Version 2.0 (the "License");
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you may not use this file except in compliance with the License.
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You may obtain a copy of the License at
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http://www.apache.org/licenses/LICENSE-2.0
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Unless required by applicable law or agreed to in writing, software
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distributed under the License is distributed on an "AS IS" BASIS,
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WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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See the License for the specific language governing permissions and
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limitations under the License.
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*/
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package initsystem
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import (
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"fmt"
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"os/exec"
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"strings"
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)
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type InitSystem interface {
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// ServiceStart tries to start a specific service
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ServiceStart(service string) error
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// ServiceStop tries to stop a specific service
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ServiceStop(service string) error
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// ServiceExists ensures the service is defined for this init system.
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ServiceExists(service string) bool
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// ServiceIsEnabled ensures the service is enabled to start on each boot.
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ServiceIsEnabled(service string) bool
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// ServiceIsActive ensures the service is running, or attempting to run. (crash looping in the case of kubelet)
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ServiceIsActive(service string) bool
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}
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type SystemdInitSystem struct{}
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func (sysd SystemdInitSystem) ServiceStart(service string) error {
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args := []string{"start", service}
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_, err := exec.Command("systemctl", args...).Output()
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return err
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}
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func (sysd SystemdInitSystem) ServiceStop(service string) error {
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args := []string{"stop", service}
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_, err := exec.Command("systemctl", args...).Output()
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return err
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}
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func (sysd SystemdInitSystem) ServiceExists(service string) bool {
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args := []string{"status", service}
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outBytes, _ := exec.Command("systemctl", args...).Output()
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output := string(outBytes)
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if strings.Contains(output, "Loaded: not-found") {
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return false
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}
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return true
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}
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func (sysd SystemdInitSystem) ServiceIsEnabled(service string) bool {
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args := []string{"is-enabled", service}
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_, err := exec.Command("systemctl", args...).Output()
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if err != nil {
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return false
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}
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return true
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}
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// ServiceIsActive will check is the service is "active". In the case of
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// crash looping services (kubelet in our case) status will return as
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// "activating", so we will consider this active as well.
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func (sysd SystemdInitSystem) ServiceIsActive(service string) bool {
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args := []string{"is-active", service}
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// Ignoring error here, command returns non-0 if in "activating" status:
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outBytes, _ := exec.Command("systemctl", args...).Output()
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output := strings.TrimSpace(string(outBytes))
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if output == "active" || output == "activating" {
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return true
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}
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return false
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}
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// getInitSystem returns an InitSystem for the current system, or nil
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// if we cannot detect a supported init system for pre-flight checks.
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// This indicates we will skip init system checks, not an error.
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func GetInitSystem() (InitSystem, error) {
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// Assume existence of systemctl in path implies this is a systemd system:
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_, err := exec.LookPath("systemctl")
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if err == nil {
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return &SystemdInitSystem{}, nil
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}
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return nil, fmt.Errorf("no supported init system detected, skipping checking for services")
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}
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