func initUserNs(container *libcontainer.Config, uncleanRootfs, consolePath string, pipe *os.File, args []string) (err error) {
// clear the current processes env and replace it with the environment
// defined on the container
if err := LoadContainerEnvironment(container); err != nil {
return err
}
// We always read this as it is a way to sync with the parent as well
var networkState *network.NetworkState
if err := json.NewDecoder(pipe).Decode(&networkState); err != nil {
return err
}
// join any namespaces via a path to the namespace fd if provided
if err := joinExistingNamespaces(container.Namespaces); err != nil {
return err
}
if consolePath != "" {
if err := console.OpenAndDup("/dev/console"); err != nil {
return err
}
}
if _, err := syscall.Setsid(); err != nil {
return fmt.Errorf("setsid %s", err)
}
if consolePath != "" {
if err := system.Setctty(); err != nil {
return fmt.Errorf("setctty %s", err)
}
}
if container.WorkingDir == "" {
container.WorkingDir = "/"
}
if err := setupRlimits(container); err != nil {
return fmt.Errorf("setup rlimits %s", err)
}
cloneFlags := GetNamespaceFlags(container.Namespaces)
if container.Hostname != "" {
if (cloneFlags & syscall.CLONE_NEWUTS) == 0 {
return fmt.Errorf("unable to set the hostname without UTS namespace")
}
if err := syscall.Sethostname([]byte(container.Hostname)); err != nil {
return fmt.Errorf("unable to sethostname %q: %s", container.Hostname, err)
}
}
if err := apparmor.ApplyProfile(container.AppArmorProfile); err != nil {
return fmt.Errorf("set apparmor profile %s: %s", container.AppArmorProfile, err)
}
if err := label.SetProcessLabel(container.ProcessLabel); err != nil {
return fmt.Errorf("set process label %s", err)
}
if container.RestrictSys {
if (cloneFlags & syscall.CLONE_NEWNS) == 0 {
return fmt.Errorf("unable to restrict access to kernel files without mount namespace")
}
if err := restrict.Restrict("proc/sys", "proc/sysrq-trigger", "proc/irq", "proc/bus"); err != nil {
return err
}
}
pdeathSignal, err := system.GetParentDeathSignal()
if err != nil {
return fmt.Errorf("get parent death signal %s", err)
}
if err := FinalizeNamespace(container); err != nil {
return fmt.Errorf("finalize namespace %s", err)
}
// FinalizeNamespace can change user/group which clears the parent death
// signal, so we restore it here.
if err := RestoreParentDeathSignal(pdeathSignal); err != nil {
return fmt.Errorf("restore parent death signal %s", err)
}
return system.Execv(args[0], args[0:], os.Environ())
}
