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standard_init_linux.go
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/
standard_init_linux.go
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// +build linux
package libcontainer
import (
"os"
"syscall"
"github.com/docker/libcontainer/apparmor"
"github.com/docker/libcontainer/configs"
"github.com/docker/libcontainer/label"
"github.com/docker/libcontainer/system"
)
type linuxStandardInit struct {
parentPid int
config *initConfig
}
func (l *linuxStandardInit) Init() error {
// join any namespaces via a path to the namespace fd if provided
if err := joinExistingNamespaces(l.config.Config.Namespaces); err != nil {
return err
}
var console *linuxConsole
if l.config.Console != "" {
console = newConsoleFromPath(l.config.Console)
if err := console.dupStdio(); err != nil {
return err
}
}
if _, err := syscall.Setsid(); err != nil {
return err
}
if console != nil {
if err := system.Setctty(); err != nil {
return err
}
}
if err := setupNetwork(l.config); err != nil {
return err
}
if err := setupRoute(l.config.Config); err != nil {
return err
}
if err := setupRlimits(l.config.Config); err != nil {
return err
}
label.Init()
// InitializeMountNamespace() can be executed only for a new mount namespace
if l.config.Config.Namespaces.Contains(configs.NEWNS) {
if err := setupRootfs(l.config.Config, console); err != nil {
return err
}
}
if hostname := l.config.Config.Hostname; hostname != "" {
if err := syscall.Sethostname([]byte(hostname)); err != nil {
return err
}
}
if err := apparmor.ApplyProfile(l.config.Config.AppArmorProfile); err != nil {
return err
}
if err := label.SetProcessLabel(l.config.Config.ProcessLabel); err != nil {
return err
}
for key, value := range l.config.Config.SystemProperties {
if err := writeSystemProperty(key, value); err != nil {
return err
}
}
for _, path := range l.config.Config.ReadonlyPaths {
if err := remountReadonly(path); err != nil {
return err
}
}
for _, path := range l.config.Config.MaskPaths {
if err := maskFile(path); err != nil {
return err
}
}
pdeath, err := system.GetParentDeathSignal()
if err != nil {
return err
}
if err := finalizeNamespace(l.config); err != nil {
return err
}
// finalizeNamespace can change user/group which clears the parent death
// signal, so we restore it here.
if err := pdeath.Restore(); err != nil {
return err
}
// compare the parent from the inital start of the init process and make sure that it did not change.
// if the parent changes that means it died and we were reparened to something else so we should
// just kill ourself and not cause problems for someone else.
if syscall.Getppid() != l.parentPid {
return syscall.Kill(syscall.Getpid(), syscall.SIGKILL)
}
if err := finalizeSeccomp(l.config); err != nil {
return err
}
return system.Execv(l.config.Args[0], l.config.Args[0:], os.Environ())
}