use c/common code for resize and CopyDetachable

Since conmon-rs also uses this code we moved it to c/common. Now podman
should has this also to prevent duplication.

[NO NEW TESTS NEEDED]

Signed-off-by: Paul Holzinger <pholzing@redhat.com>

utils/utils.go

@@ -13,7 +13,6 @@ import (
 	"sync"
 
 	"github.com/containers/common/pkg/cgroups"
-	"github.com/containers/podman/v4/libpod/define"
 	"github.com/containers/storage/pkg/archive"
 	"github.com/godbus/dbus/v5"
 	"github.com/sirupsen/logrus"
@@ -52,57 +51,6 @@ func ExecCmdWithStdStreams(stdin io.Reader, stdout, stderr io.Writer, env []stri
 	return nil
 }
 
-// ErrDetach is an error indicating that the user manually detached from the
-// container.
-var ErrDetach = define.ErrDetach
-
-// CopyDetachable is similar to io.Copy but support a detach key sequence to break out.
-func CopyDetachable(dst io.Writer, src io.Reader, keys []byte) (written int64, err error) {
-	buf := make([]byte, 32*1024)
-	for {
-		nr, er := src.Read(buf)
-		if nr > 0 {
-			preservBuf := []byte{}
-			for i, key := range keys {
-				preservBuf = append(preservBuf, buf[0:nr]...)
-				if nr != 1 || buf[0] != key {
-					break
-				}
-				if i == len(keys)-1 {
-					return 0, ErrDetach
-				}
-				nr, er = src.Read(buf)
-			}
-			var nw int
-			var ew error
-			if len(preservBuf) > 0 {
-				nw, ew = dst.Write(preservBuf)
-				nr = len(preservBuf)
-			} else {
-				nw, ew = dst.Write(buf[0:nr])
-			}
-			if nw > 0 {
-				written += int64(nw)
-			}
-			if ew != nil {
-				err = ew
-				break
-			}
-			if nr != nw {
-				err = io.ErrShortWrite
-				break
-			}
-		}
-		if er != nil {
-			if er != io.EOF {
-				err = er
-			}
-			break
-		}
-	}
-	return written, err
-}
-
 // UntarToFileSystem untars an os.file of a tarball to a destination in the filesystem
 func UntarToFileSystem(dest string, tarball *os.File, options *archive.TarOptions) error {
 	logrus.Debugf("untarring %s", tarball.Name())