Move io.go into cio package

Signed-off-by: Daniel Nephin <dnephin@gmail.com>

cio/io_windows.go

@@ -0,0 +1,117 @@
+package cio
+
+import (
+	"fmt"
+	"io"
+	"net"
+	"sync"
+
+	winio "github.com/Microsoft/go-winio"
+	"github.com/containerd/containerd/log"
+	"github.com/pkg/errors"
+)
+
+const pipeRoot = `\\.\pipe`
+
+// NewFifos returns a new set of fifos for the task
+func NewFifos(id string) (*FIFOSet, error) {
+	return &FIFOSet{
+		In:  fmt.Sprintf(`%s\ctr-%s-stdin`, pipeRoot, id),
+		Out: fmt.Sprintf(`%s\ctr-%s-stdout`, pipeRoot, id),
+		Err: fmt.Sprintf(`%s\ctr-%s-stderr`, pipeRoot, id),
+	}, nil
+}
+
+func copyIO(fifos *FIFOSet, ioset *ioSet, tty bool) (_ *wgCloser, err error) {
+	var (
+		wg  sync.WaitGroup
+		set []io.Closer
+	)
+
+	if fifos.In != "" {
+		l, err := winio.ListenPipe(fifos.In, nil)
+		if err != nil {
+			return nil, errors.Wrapf(err, "failed to create stdin pipe %s", fifos.In)
+		}
+		defer func(l net.Listener) {
+			if err != nil {
+				l.Close()
+			}
+		}(l)
+		set = append(set, l)
+
+		go func() {
+			c, err := l.Accept()
+			if err != nil {
+				log.L.WithError(err).Errorf("failed to accept stdin connection on %s", fifos.In)
+				return
+			}
+			io.Copy(c, ioset.in)
+			c.Close()
+			l.Close()
+		}()
+	}
+
+	if fifos.Out != "" {
+		l, err := winio.ListenPipe(fifos.Out, nil)
+		if err != nil {
+			return nil, errors.Wrapf(err, "failed to create stdin pipe %s", fifos.Out)
+		}
+		defer func(l net.Listener) {
+			if err != nil {
+				l.Close()
+			}
+		}(l)
+		set = append(set, l)
+
+		wg.Add(1)
+		go func() {
+			defer wg.Done()
+			c, err := l.Accept()
+			if err != nil {
+				log.L.WithError(err).Errorf("failed to accept stdout connection on %s", fifos.Out)
+				return
+			}
+			io.Copy(ioset.out, c)
+			c.Close()
+			l.Close()
+		}()
+	}
+
+	if !tty && fifos.Err != "" {
+		l, err := winio.ListenPipe(fifos.Err, nil)
+		if err != nil {
+			return nil, errors.Wrapf(err, "failed to create stderr pipe %s", fifos.Err)
+		}
+		defer func(l net.Listener) {
+			if err != nil {
+				l.Close()
+			}
+		}(l)
+		set = append(set, l)
+
+		wg.Add(1)
+		go func() {
+			defer wg.Done()
+			c, err := l.Accept()
+			if err != nil {
+				log.L.WithError(err).Errorf("failed to accept stderr connection on %s", fifos.Err)
+				return
+			}
+			io.Copy(ioset.err, c)
+			c.Close()
+			l.Close()
+		}()
+	}
+
+	return &wgCloser{
+		wg:  &wg,
+		dir: fifos.Dir,
+		set: set,
+		cancel: func() {
+			for _, l := range set {
+				l.Close()
+			}
+		},
+	}, nil
+}