runc/init.go at psi · dqminh/runc

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package main

import (

"os"

"runtime"

"strconv"

"github.com/opencontainers/runc/libcontainer"

_ "github.com/opencontainers/runc/libcontainer/nsenter"

"github.com/sirupsen/logrus"

)

func init() {

if len(os.Args) > 1 && os.Args[1] == "init" {

// This is the golang entry point for runc init, executed

// before main() but after libcontainer/nsenter's nsexec().

runtime.GOMAXPROCS(1)

runtime.LockOSThread()

level, err := strconv.Atoi(os.Getenv("_LIBCONTAINER_LOGLEVEL"))

if err != nil {

panic(err)

}

logPipeFd, err := strconv.Atoi(os.Getenv("_LIBCONTAINER_LOGPIPE"))

if err != nil {

panic(err)

}

logrus.SetLevel(logrus.Level(level))

logrus.SetOutput(os.NewFile(uintptr(logPipeFd), "logpipe"))

logrus.SetFormatter(new(logrus.JSONFormatter))

logrus.Debug("child process in init()")

if err := libcontainer.StartInitialization(); err != nil {

// as the error is sent back to the parent there is no need to log

// or write it to stderr because the parent process will handle this

os.Exit(1)

}

panic("libcontainer: container init failed to exec")

}