update vendor

Signed-off-by: Jess Frazelle <acidburn@microsoft.com>

vendor/github.com/opencontainers/runc/libcontainer/nsenter/README.md

@@ -0,0 +1,44 @@
+## nsenter
+
+The `nsenter` package registers a special init constructor that is called before 
+the Go runtime has a chance to boot.  This provides us the ability to `setns` on 
+existing namespaces and avoid the issues that the Go runtime has with multiple 
+threads.  This constructor will be called if this package is registered, 
+imported, in your go application.
+
+The `nsenter` package will `import "C"` and it uses [cgo](https://golang.org/cmd/cgo/)
+package. In cgo, if the import of "C" is immediately preceded by a comment, that comment, 
+called the preamble, is used as a header when compiling the C parts of the package.
+So every time we  import package `nsenter`, the C code function `nsexec()` would be 
+called. And package `nsenter` is now only imported in `main_unix.go`, so every time
+before we call `cmd.Start` on linux, that C code would run.
+
+Because `nsexec()` must be run before the Go runtime in order to use the
+Linux kernel namespace, you must `import` this library into a package if
+you plan to use `libcontainer` directly. Otherwise Go will not execute
+the `nsexec()` constructor, which means that the re-exec will not cause
+the namespaces to be joined. You can import it like this:
+
+```go
+import _ "github.com/opencontainers/runc/libcontainer/nsenter"
+```
+
+`nsexec()` will first get the file descriptor number for the init pipe
+from the environment variable `_LIBCONTAINER_INITPIPE` (which was opened
+by the parent and kept open across the fork-exec of the `nsexec()` init
+process). The init pipe is used to read bootstrap data (namespace paths,
+clone flags, uid and gid mappings, and the console path) from the parent
+process. `nsexec()` will then call `setns(2)` to join the namespaces
+provided in the bootstrap data (if available), `clone(2)` a child process
+with the provided clone flags, update the user and group ID mappings, do
+some further miscellaneous setup steps, and then send the PID of the
+child process to the parent of the `nsexec()` "caller". Finally,
+the parent `nsexec()` will exit and the child `nsexec()` process will
+return to allow the Go runtime take over.
+
+NOTE: We do both `setns(2)` and `clone(2)` even if we don't have any
+CLONE_NEW* clone flags because we must fork a new process in order to
+enter the PID namespace.
+
+
+

vendor/github.com/opencontainers/runc/libcontainer/nsenter/namespace.h

@@ -0,0 +1,32 @@
+#ifndef NSENTER_NAMESPACE_H
+#define NSENTER_NAMESPACE_H
+
+#ifndef _GNU_SOURCE
+#	define _GNU_SOURCE
+#endif
+#include <sched.h>
+
+/* All of these are taken from include/uapi/linux/sched.h */
+#ifndef CLONE_NEWNS
+#	define CLONE_NEWNS 0x00020000 /* New mount namespace group */
+#endif
+#ifndef CLONE_NEWCGROUP
+#	define CLONE_NEWCGROUP 0x02000000 /* New cgroup namespace */
+#endif
+#ifndef CLONE_NEWUTS
+#	define CLONE_NEWUTS 0x04000000 /* New utsname namespace */
+#endif
+#ifndef CLONE_NEWIPC
+#	define CLONE_NEWIPC 0x08000000 /* New ipc namespace */
+#endif
+#ifndef CLONE_NEWUSER
+#	define CLONE_NEWUSER 0x10000000 /* New user namespace */
+#endif
+#ifndef CLONE_NEWPID
+#	define CLONE_NEWPID 0x20000000 /* New pid namespace */
+#endif
+#ifndef CLONE_NEWNET
+#	define CLONE_NEWNET 0x40000000 /* New network namespace */
+#endif
+
+#endif /* NSENTER_NAMESPACE_H */

vendor/github.com/opencontainers/runc/libcontainer/nsenter/nsenter_test.go

@@ -0,0 +1,175 @@
+package nsenter
+
+import (
+	"bytes"
+	"encoding/json"
+	"fmt"
+	"io"
+	"io/ioutil"
+	"os"
+	"os/exec"
+	"strings"
+	"testing"
+
+	"github.com/opencontainers/runc/libcontainer"
+	"github.com/vishvananda/netlink/nl"
+
+	"golang.org/x/sys/unix"
+)
+
+type pid struct {
+	Pid int `json:"Pid"`
+}
+
+func TestNsenterValidPaths(t *testing.T) {
+	args := []string{"nsenter-exec"}
+	parent, child, err := newPipe()
+	if err != nil {
+		t.Fatalf("failed to create pipe %v", err)
+	}
+
+	namespaces := []string{
+		// join pid ns of the current process
+		fmt.Sprintf("pid:/proc/%d/ns/pid", os.Getpid()),
+	}
+	cmd := &exec.Cmd{
+		Path:       os.Args[0],
+		Args:       args,
+		ExtraFiles: []*os.File{child},
+		Env:        []string{"_LIBCONTAINER_INITPIPE=3"},
+		Stdout:     os.Stdout,
+		Stderr:     os.Stderr,
+	}
+
+	if err := cmd.Start(); err != nil {
+		t.Fatalf("nsenter failed to start %v", err)
+	}
+	// write cloneFlags
+	r := nl.NewNetlinkRequest(int(libcontainer.InitMsg), 0)
+	r.AddData(&libcontainer.Int32msg{
+		Type:  libcontainer.CloneFlagsAttr,
+		Value: uint32(unix.CLONE_NEWNET),
+	})
+	r.AddData(&libcontainer.Bytemsg{
+		Type:  libcontainer.NsPathsAttr,
+		Value: []byte(strings.Join(namespaces, ",")),
+	})
+	if _, err := io.Copy(parent, bytes.NewReader(r.Serialize())); err != nil {
+		t.Fatal(err)
+	}
+
+	decoder := json.NewDecoder(parent)
+	var pid *pid
+
+	if err := cmd.Wait(); err != nil {
+		t.Fatalf("nsenter exits with a non-zero exit status")
+	}
+	if err := decoder.Decode(&pid); err != nil {
+		dir, _ := ioutil.ReadDir(fmt.Sprintf("/proc/%d/ns", os.Getpid()))
+		for _, d := range dir {
+			t.Log(d.Name())
+		}
+		t.Fatalf("%v", err)
+	}
+
+	p, err := os.FindProcess(pid.Pid)
+	if err != nil {
+		t.Fatalf("%v", err)
+	}
+	p.Wait()
+}
+
+func TestNsenterInvalidPaths(t *testing.T) {
+	args := []string{"nsenter-exec"}
+	parent, child, err := newPipe()
+	if err != nil {
+		t.Fatalf("failed to create pipe %v", err)
+	}
+
+	namespaces := []string{
+		// join pid ns of the current process
+		fmt.Sprintf("pid:/proc/%d/ns/pid", -1),
+	}
+	cmd := &exec.Cmd{
+		Path:       os.Args[0],
+		Args:       args,
+		ExtraFiles: []*os.File{child},
+		Env:        []string{"_LIBCONTAINER_INITPIPE=3"},
+	}
+
+	if err := cmd.Start(); err != nil {
+		t.Fatal(err)
+	}
+	// write cloneFlags
+	r := nl.NewNetlinkRequest(int(libcontainer.InitMsg), 0)
+	r.AddData(&libcontainer.Int32msg{
+		Type:  libcontainer.CloneFlagsAttr,
+		Value: uint32(unix.CLONE_NEWNET),
+	})
+	r.AddData(&libcontainer.Bytemsg{
+		Type:  libcontainer.NsPathsAttr,
+		Value: []byte(strings.Join(namespaces, ",")),
+	})
+	if _, err := io.Copy(parent, bytes.NewReader(r.Serialize())); err != nil {
+		t.Fatal(err)
+	}
+
+	if err := cmd.Wait(); err == nil {
+		t.Fatalf("nsenter exits with a zero exit status")
+	}
+}
+
+func TestNsenterIncorrectPathType(t *testing.T) {
+	args := []string{"nsenter-exec"}
+	parent, child, err := newPipe()
+	if err != nil {
+		t.Fatalf("failed to create pipe %v", err)
+	}
+
+	namespaces := []string{
+		// join pid ns of the current process
+		fmt.Sprintf("net:/proc/%d/ns/pid", os.Getpid()),
+	}
+	cmd := &exec.Cmd{
+		Path:       os.Args[0],
+		Args:       args,
+		ExtraFiles: []*os.File{child},
+		Env:        []string{"_LIBCONTAINER_INITPIPE=3"},
+	}
+
+	if err := cmd.Start(); err != nil {
+		t.Fatal(err)
+	}
+	// write cloneFlags
+	r := nl.NewNetlinkRequest(int(libcontainer.InitMsg), 0)
+	r.AddData(&libcontainer.Int32msg{
+		Type:  libcontainer.CloneFlagsAttr,
+		Value: uint32(unix.CLONE_NEWNET),
+	})
+	r.AddData(&libcontainer.Bytemsg{
+		Type:  libcontainer.NsPathsAttr,
+		Value: []byte(strings.Join(namespaces, ",")),
+	})
+	if _, err := io.Copy(parent, bytes.NewReader(r.Serialize())); err != nil {
+		t.Fatal(err)
+	}
+
+	if err := cmd.Wait(); err == nil {
+		t.Fatalf("nsenter exits with a zero exit status")
+	}
+}
+
+func init() {
+	if strings.HasPrefix(os.Args[0], "nsenter-") {
+		os.Exit(0)
+	}
+	return
+}
+
+func newPipe() (parent *os.File, child *os.File, err error) {
+	fds, err := unix.Socketpair(unix.AF_LOCAL, unix.SOCK_STREAM|unix.SOCK_CLOEXEC, 0)
+	if err != nil {
+		return nil, nil, err
+	}
+	return os.NewFile(uintptr(fds[1]), "parent"), os.NewFile(uintptr(fds[0]), "child"), nil
+}