// NsEnter is run after entering the namespace. func NsEnter(container *libcontainer.Container, processLabel string, nspid int, args []string) error { // clear the current processes env and replace it with the environment // defined on the container if err := LoadContainerEnvironment(container); err != nil { return err } if err := FinalizeNamespace(container); err != nil { return err } if err := label.SetProcessLabel(processLabel); err != nil { return err } if err := system.Execv(args[0], args[0:], container.Env); err != nil { return err } panic("unreachable") }
// Init is the init process that first runs inside a new namespace to setup mounts, users, networking, // and other options required for the new container. func Init(container *libcontainer.Container, uncleanRootfs, consolePath string, syncPipe *SyncPipe, args []string) error { rootfs, err := utils.ResolveRootfs(uncleanRootfs) if err != nil { return err } // 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 context, err := syncPipe.ReadFromParent() if err != nil { syncPipe.Close() return err } syncPipe.Close() if consolePath != "" { if err := console.OpenAndDup(consolePath); err != nil { return err } } if _, err := system.Setsid(); err != nil { return fmt.Errorf("setsid %s", err) } if consolePath != "" { if err := system.Setctty(); err != nil { return fmt.Errorf("setctty %s", err) } } if err := setupNetwork(container, context); err != nil { return fmt.Errorf("setup networking %s", err) } if err := setupRoute(container); err != nil { return fmt.Errorf("setup route %s", err) } label.Init() if err := mount.InitializeMountNamespace(rootfs, consolePath, container); err != nil { return fmt.Errorf("setup mount namespace %s", err) } if container.Hostname != "" { if err := system.Sethostname(container.Hostname); err != nil { return fmt.Errorf("sethostname %s", err) } } runtime.LockOSThread() if err := apparmor.ApplyProfile(container.Context["apparmor_profile"]); err != nil { return fmt.Errorf("set apparmor profile %s: %s", container.Context["apparmor_profile"], err) } if err := label.SetProcessLabel(container.Context["process_label"]); err != nil { return fmt.Errorf("set process label %s", err) } if container.Context["restrictions"] != "" { if err := restrict.Restrict("proc/sys", "proc/sysrq-trigger", "proc/irq", "proc/bus", "sys"); 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:], container.Env) }