container_exec: fix terminal true process json

Signed-off-by: Antonio Murdaca <runcom@redhat.com>

server/container_exec.go

@@ -1,10 +1,8 @@
 package server
 
 import (
-	"encoding/json"
 	"fmt"
 	"io"
-	"io/ioutil"
 	"os"
 	"os/exec"
 	"time"
@@ -55,28 +53,14 @@ func (ss streamService) Exec(containerID string, cmd []string, stdin io.Reader,
 		return fmt.Errorf("container is not created or running")
 	}
 
-	f, err := ioutil.TempFile("", "exec-process")
+	processFile, err := oci.PrepareProcessExec(c, cmd, tty)
 	if err != nil {
 		return err
 	}
-	defer os.RemoveAll(f.Name())
-
-	pspec := c.Spec().Process
-	pspec.Args = cmd
-	processJSON, err := json.Marshal(pspec)
-	if err != nil {
-		return err
-	}
-
-	if err := ioutil.WriteFile(f.Name(), processJSON, 0644); err != nil {
-		return err
-	}
+	defer os.RemoveAll(processFile.Name())
 
 	args := []string{"exec"}
-	if tty {
-		args = append(args, "-t")
-	}
-	args = append(args, "-p", f.Name())
+	args = append(args, "--process", processFile.Name())
 	args = append(args, c.ID())
 	execCmd := exec.Command(ss.runtimeServer.Runtime().Path(c), args...)
 	var cmdErr error