Fix issue with NewFIFOSetInDir with Terminal true

Signed-off-by: Justin Terry (VM) <juterry@microsoft.com>

cio/io_windows.go

@@ -31,11 +31,15 @@ const pipeRoot = `\\.\pipe`
 
 // NewFIFOSetInDir returns a new set of fifos for the task
 func NewFIFOSetInDir(_, id string, terminal bool) (*FIFOSet, error) {
+	stderrPipe := ""
+	if !terminal {
+		stderrPipe = fmt.Sprintf(`%s\ctr-%s-stderr`, pipeRoot, id)
+	}
 	return NewFIFOSet(Config{
 		Terminal: terminal,
 		Stdin:    fmt.Sprintf(`%s\ctr-%s-stdin`, pipeRoot, id),
 		Stdout:   fmt.Sprintf(`%s\ctr-%s-stdout`, pipeRoot, id),
-		Stderr:   fmt.Sprintf(`%s\ctr-%s-stderr`, pipeRoot, id),
+		Stderr:   stderrPipe,
 	}, nil), nil
 }
 

cio/io_windows_test.go

@@ -0,0 +1,49 @@
+// +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 cio
+
+import (
+	"testing"
+
+	"gotest.tools/assert"
+)
+
+func TestNewFifoSetInDir_NoTerminal(t *testing.T) {
+	set, err := NewFIFOSetInDir("", t.Name(), false)
+	if err != nil {
+		t.Fatalf("NewFifoSetInDir failed with: %v", err)
+	}
+
+	assert.Assert(t, !set.Terminal, "FIFOSet.Terminal should be false")
+	assert.Assert(t, set.Stdin != "", "FIFOSet.Stdin should be set")
+	assert.Assert(t, set.Stdout != "", "FIFOSet.Stdout should be set")
+	assert.Assert(t, set.Stderr != "", "FIFOSet.Stderr should be set")
+}
+
+func TestNewFifoSetInDir_Terminal(t *testing.T) {
+	set, err := NewFIFOSetInDir("", t.Name(), true)
+	if err != nil {
+		t.Fatalf("NewFifoSetInDir failed with: %v", err)
+	}
+
+	assert.Assert(t, set.Terminal, "FIFOSet.Terminal should be false")
+	assert.Assert(t, set.Stdin != "", "FIFOSet.Stdin should be set")
+	assert.Assert(t, set.Stdout != "", "FIFOSet.Stdout should be set")
+	assert.Assert(t, set.Stderr == "", "FIFOSet.Stderr should not be set")
+}