Switch to new vendor directory layout

Fixes #113

Signed-off-by: Marcos Lilljedahl <marcosnils@gmail.com>

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

@@ -0,0 +1,134 @@
+package nsenter
+
+import (
+	"bytes"
+	"encoding/json"
+	"fmt"
+	"io"
+	"io/ioutil"
+	"os"
+	"os/exec"
+	"strings"
+	"syscall"
+	"testing"
+
+	"github.com/opencontainers/runc/libcontainer"
+	"github.com/vishvananda/netlink/nl"
+)
+
+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("/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(syscall.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 := 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)
+	}
+
+	if err := cmd.Wait(); err != nil {
+		t.Fatalf("nsenter exits with a non-zero exit status")
+	}
+	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("/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(syscall.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 := syscall.Socketpair(syscall.AF_LOCAL, syscall.SOCK_STREAM|syscall.SOCK_CLOEXEC, 0)
+	if err != nil {
+		return nil, nil, err
+	}
+	return os.NewFile(uintptr(fds[1]), "parent"), os.NewFile(uintptr(fds[0]), "child"), nil
+}