Update gomod and vendor

vendor/github.com/containerd/go-runc/io_unix.go

@@ -0,0 +1,76 @@
+// +build !windows
+
+/*
+   Copyright The containerd Authors.
+
+   Licensed under the Apache License, Version 2.0 (the "License");
+   you may not use this file except in compliance with the License.
+   You may obtain a copy of the License at
+
+       http://www.apache.org/licenses/LICENSE-2.0
+
+   Unless required by applicable law or agreed to in writing, software
+   distributed under the License is distributed on an "AS IS" BASIS,
+   WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+   See the License for the specific language governing permissions and
+   limitations under the License.
+*/
+
+package runc
+
+import (
+	"github.com/pkg/errors"
+	"golang.org/x/sys/unix"
+)
+
+// NewPipeIO creates pipe pairs to be used with runc
+func NewPipeIO(uid, gid int, opts ...IOOpt) (i IO, err error) {
+	option := defaultIOOption()
+	for _, o := range opts {
+		o(option)
+	}
+	var (
+		pipes                 []*pipe
+		stdin, stdout, stderr *pipe
+	)
+	// cleanup in case of an error
+	defer func() {
+		if err != nil {
+			for _, p := range pipes {
+				p.Close()
+			}
+		}
+	}()
+	if option.OpenStdin {
+		if stdin, err = newPipe(); err != nil {
+			return nil, err
+		}
+		pipes = append(pipes, stdin)
+		if err = unix.Fchown(int(stdin.r.Fd()), uid, gid); err != nil {
+			return nil, errors.Wrap(err, "failed to chown stdin")
+		}
+	}
+	if option.OpenStdout {
+		if stdout, err = newPipe(); err != nil {
+			return nil, err
+		}
+		pipes = append(pipes, stdout)
+		if err = unix.Fchown(int(stdout.w.Fd()), uid, gid); err != nil {
+			return nil, errors.Wrap(err, "failed to chown stdout")
+		}
+	}
+	if option.OpenStderr {
+		if stderr, err = newPipe(); err != nil {
+			return nil, err
+		}
+		pipes = append(pipes, stderr)
+		if err = unix.Fchown(int(stderr.w.Fd()), uid, gid); err != nil {
+			return nil, errors.Wrap(err, "failed to chown stderr")
+		}
+	}
+	return &pipeIO{
+		in:  stdin,
+		out: stdout,
+		err: stderr,
+	}, nil
+}