remove os-specific IsTerminal methods, and use x/crypto/ssh/terminal instead

terminal_notwindows.go

@@ -1,29 +0,0 @@
-// Based on ssh/terminal:
-// Copyright 2011 The Go Authors. All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
-
-// +build linux darwin freebsd openbsd netbsd dragonfly nacl
-// +build !appengine
-
-package logrus
-
-import (
-	"io"
-	"os"
-	"unsafe"
-
-	"golang.org/x/sys/unix"
-)
-
-// IsTerminal returns true if stderr's file descriptor is a terminal.
-func IsTerminal(f io.Writer) bool {
-	var termios Termios
-	switch v := f.(type) {
-	case *os.File:
-		_, _, err := unix.Syscall6(unix.SYS_IOCTL, uintptr(v.Fd()), ioctlReadTermios, uintptr(unsafe.Pointer(&termios)), 0, 0, 0)
-		return err == 0
-	default:
-		return false
-	}
-}