/
root.go
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/
root.go
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// Copyright (C) 2017-Present CloudFoundry.org Foundation, Inc. All rights reserved.
//
// This program and the accompanying materials are made available under
// the terms of the 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 commands
import (
"errors"
"fmt"
"os"
"os/user"
"path/filepath"
"code.cloudfoundry.org/clock"
"code.cloudfoundry.org/lager"
"github.com/spf13/cobra"
"bpm/bosh"
"bpm/cgroups"
"bpm/config"
"bpm/hostlock"
"bpm/runc/adapter"
"bpm/runc/client"
"bpm/runc/lifecycle"
"bpm/sharedvolume"
"bpm/sysfeat"
"bpm/usertools"
)
var (
bpmCfg *config.BPMConfig
logger lager.Logger
procName string
showVersion bool
userFinder = usertools.NewUserFinder()
boshEnv = bosh.NewEnv(os.Getenv("BPM_BOSH_ROOT"))
locks *hostlock.Handle
lifecycleLock hostlock.LockedLock
)
func init() {
RootCmd.PersistentFlags().BoolVar(&showVersion, "version", false, "print BPM version")
}
var RootCmd = &cobra.Command{
Long: "A bosh process manager for starting and stopping release jobs",
RunE: root,
Short: "A bosh process manager for starting and stopping release jobs",
SilenceErrors: true,
Use: "bpm",
PersistentPreRunE: rootPre,
}
func rootPre(cmd *cobra.Command, _ []string) error {
if showVersion {
version(cmd, []string{})
os.Exit(0)
}
usr, err := user.Current()
if err != nil {
return err
}
if usr.Uid != "0" && usr.Gid != "0" {
cmd.SilenceUsage = true
return errors.New("bpm must be run as root. Please run 'sudo -i' to become the root user.")
}
lockDir := config.LocksPath(boshEnv)
if err := os.MkdirAll(lockDir, 0700); err != nil {
return err
}
locks = hostlock.NewHandle(lockDir)
if !isRunningSystemd() {
return cgroups.Setup()
}
return nil
}
func root(cmd *cobra.Command, args []string) error {
return errors.New("Exit code 1")
}
func validateInput(args []string) error {
if len(args) < 1 {
return errors.New("must specify a job")
}
jobName := args[0]
if procName == "" {
procName = jobName
}
bpmCfg = config.NewBPMConfig(boshEnv, jobName, procName)
return nil
}
func setupBpmLogs(sessionName string) error {
err := os.MkdirAll(bpmCfg.LogDir().External(), 0750)
if err != nil {
return err
}
logFile, err := os.OpenFile(bpmCfg.BPMLog(), os.O_RDWR|os.O_CREATE|os.O_APPEND, 0600)
if err != nil {
return err
}
usr, err := userFinder.Lookup(usertools.VcapUser)
if err != nil {
return err
}
err = os.Chown(bpmCfg.BPMLog(), int(usr.UID), int(usr.GID))
if err != nil {
return err
}
logger = lager.NewLogger("bpm")
logger.RegisterSink(lager.NewPrettySink(logFile, lager.INFO))
logger = logger.Session(sessionName, lager.Data{
"job": bpmCfg.JobName(),
"process": bpmCfg.ProcName(),
})
return nil
}
func acquireLifecycleLock() error {
l := logger.Session("acquiring-lifecycle-lock")
l.Info("starting")
defer l.Info("complete")
var err error
lifecycleLock, err = locks.LockJob(bpmCfg.JobName(), bpmCfg.ProcName())
if err != nil {
l.Error("failed-to-acquire-lock", err)
return err
}
return nil
}
func releaseLifecycleLock() error {
l := logger.Session("releasing-lifecycle-lock")
l.Info("starting")
defer l.Info("complete")
if err := lifecycleLock.Unlock(); err != nil {
l.Error("failed-to-release-lock", err)
return err
}
return nil
}
func newRuncLifecycle() (*lifecycle.RuncLifecycle, error) {
runcClient := client.NewRuncClient(
config.RuncPath(boshEnv),
config.RuncRoot(boshEnv),
isRunningSystemd(),
)
features, err := sysfeat.Fetch()
if err != nil {
return nil, fmt.Errorf("failed to fetch system features: %q", err)
}
runcAdapter := adapter.NewRuncAdapter(*features, filepath.Glob, sharedvolume.MakeShared, locks)
clock := clock.NewClock()
return lifecycle.NewRuncLifecycle(
runcClient,
runcAdapter,
userFinder,
lifecycle.NewCommandRunner(),
clock,
os.RemoveAll,
), nil
}
func processByNameFromJobConfig(jobCfg *config.JobConfig, procName string) (*config.ProcessConfig, error) {
for _, processConfig := range jobCfg.Processes {
if processConfig.Name == procName {
return processConfig, nil
}
}
return nil, fmt.Errorf("invalid process: %s", procName)
}
func isRunningSystemd() bool {
systemdSystemDir, err := os.Lstat("/run/systemd/system")
if err != nil {
return false
}
return systemdSystemDir.IsDir()
}
// Occasionally RunC can get in an inconsistent state after a restart where
// it's internal state.json file is truncated. RunC is unable to get out of
// this state without some intervention. This is that intervention.
func forceCleanupBrokenRuncState(logger lager.Logger, runcLifecycle *lifecycle.RuncLifecycle) error {
// We compute this here rather than adding a new function to the
// configuration object to try and contain this hack to one place.
statePath := filepath.Join(config.RuncRoot(boshEnv), bpmCfg.ContainerID(), "state.json")
if err := os.RemoveAll(statePath); err != nil {
logger.Error("failed-to-remove-state-file", err)
return fmt.Errorf("failed to clean up stale state file: %s", err)
}
if err := runcLifecycle.RemoveProcess(logger, bpmCfg); err != nil {
logger.Error("failed-to-cleanup", err)
return fmt.Errorf("failed to clean up stale job-process: %s", err)
}
return nil
}