Move shim service into top lvl package

Signed-off-by: Michael Crosby <crosbymichael@gmail.com>

shim/io.go

@@ -0,0 +1,81 @@
+package shim
+
+import (
+	"context"
+	"fmt"
+	"io"
+	"sync"
+	"syscall"
+
+	runc "github.com/crosbymichael/go-runc"
+	"github.com/tonistiigi/fifo"
+)
+
+func copyConsole(ctx context.Context, console *runc.Console, stdin, stdout, stderr string, wg *sync.WaitGroup) error {
+	in, err := fifo.OpenFifo(ctx, stdin, syscall.O_RDONLY, 0)
+	if err != nil {
+		return err
+	}
+	go io.Copy(console, in)
+	outw, err := fifo.OpenFifo(ctx, stdout, syscall.O_WRONLY, 0)
+	if err != nil {
+		return err
+	}
+	outr, err := fifo.OpenFifo(ctx, stdout, syscall.O_RDONLY, 0)
+	if err != nil {
+		return err
+	}
+	wg.Add(1)
+	go func() {
+		io.Copy(outw, console)
+		console.Close()
+		outr.Close()
+		outw.Close()
+		wg.Done()
+	}()
+	return nil
+}
+
+func copyPipes(ctx context.Context, rio runc.IO, stdin, stdout, stderr string, wg *sync.WaitGroup) error {
+	for name, dest := range map[string]func(wc io.WriteCloser, rc io.Closer){
+		stdout: func(wc io.WriteCloser, rc io.Closer) {
+			wg.Add(1)
+			go func() {
+				io.Copy(wc, rio.Stdout())
+				wg.Done()
+				wc.Close()
+				rc.Close()
+			}()
+		},
+		stderr: func(wc io.WriteCloser, rc io.Closer) {
+			wg.Add(1)
+			go func() {
+				io.Copy(wc, rio.Stderr())
+				wg.Done()
+				wc.Close()
+				rc.Close()
+			}()
+		},
+	} {
+		fw, err := fifo.OpenFifo(ctx, name, syscall.O_WRONLY, 0)
+		if err != nil {
+			return fmt.Errorf("containerd-shim: opening %s failed: %s", name, err)
+		}
+		fr, err := fifo.OpenFifo(ctx, name, syscall.O_RDONLY, 0)
+		if err != nil {
+			return fmt.Errorf("containerd-shim: opening %s failed: %s", name, err)
+		}
+		dest(fw, fr)
+	}
+
+	f, err := fifo.OpenFifo(ctx, stdin, syscall.O_RDONLY, 0)
+	if err != nil {
+		return fmt.Errorf("containerd-shim: opening %s failed: %s", stdin, err)
+	}
+	go func() {
+		io.Copy(rio.Stdin(), f)
+		rio.Stdin().Close()
+		f.Close()
+	}()
+	return nil
+}