terminal: Add support for Darwin

Created a new `terminal_darwin.go` (and associated test).

Made changes to .travis.yml to support travis osx tests

Fixes #86

Signed-off-by: Ricardo Aravena <raravena@branch.io>

.travis.yml

@@ -4,8 +4,16 @@
 # SPDX-License-Identifier: Apache-2.0
 #
 
-sudo: required
-dist: trusty
+
+os:
+  - linux
+  - osx
+
+matrix:
+  include:
+    - os: linux
+      sudo: required
+      dist: trusty
 
 language: go
 go_import_path: github.com/kata-containers/shim
@@ -17,8 +25,10 @@ before_script:
   - ".ci/static-checks.sh"
 
 before_install:
-  - sudo apt-get update -qq
-  - sudo apt-get install -y -qq automake
+  - if [[ "$TRAVIS_OS_NAME" == "osx" ]]; then brew update                            ; fi
+  - if [[ "$TRAVIS_OS_NAME" == "osx" ]]; then brew install automake                  ; fi
+  - if [[ "$TRAVIS_OS_NAME" == "linux" ]]; then sudo apt-get update -qq              ; fi
+  - if [[ "$TRAVIS_OS_NAME" == "linux" ]]; then sudo apt-get install -y -qq automake ; fi
 
 install:
   - cd ${TRAVIS_BUILD_DIR} && make

terminal_darwin.go

@@ -0,0 +1,49 @@
+// Copyright (c) 2017 Intel Corporation
+//
+// SPDX-License-Identifier: Apache-2.0
+//
+
+package main
+
+import (
+	"golang.org/x/sys/unix"
+)
+
+const (
+	termiosIFlagRawTermInvMask = (unix.IGNBRK | unix.BRKINT | unix.PARMRK | unix.ISTRIP | unix.INLCR | unix.IGNCR | unix.ICRNL | unix.IXON)
+	termiosOFlagRawTermInvMask = unix.OPOST
+	termiosLFlagRawTermInvMask = (unix.ECHO | unix.ECHONL | unix.ICANON | unix.ISIG | unix.IEXTEN)
+	termiosCFlagRawTermInvMask = unix.PARENB
+	termiosCFlagRawTermMask    = unix.CS8
+	termiosCcVMinRawTermVal    = 1
+	termiosCcVTimeRawTermVal   = 0
+)
+
+func setupTerminal(fd int) (*unix.Termios, error) {
+	termios, err := unix.IoctlGetTermios(fd, unix.TIOCGETA)
+	if err != nil {
+		return nil, err
+	}
+
+	var savedTermios unix.Termios
+	savedTermios = *termios
+
+	// Set the terminal in raw mode
+	termios.Iflag &^= termiosIFlagRawTermInvMask
+	termios.Oflag &^= termiosOFlagRawTermInvMask
+	termios.Lflag &^= termiosLFlagRawTermInvMask
+	termios.Cflag &^= termiosCFlagRawTermInvMask
+	termios.Cflag |= termiosCFlagRawTermMask
+	termios.Cc[unix.VMIN] = termiosCcVMinRawTermVal
+	termios.Cc[unix.VTIME] = termiosCcVTimeRawTermVal
+
+	if err := unix.IoctlSetTermios(fd, unix.TIOCSETA, termios); err != nil {
+		return nil, err
+	}
+
+	return &savedTermios, nil
+}
+
+func restoreTerminal(fd int, termios *unix.Termios) error {
+	return unix.IoctlSetTermios(fd, unix.TIOCSETA, termios)
+}

terminal_darwin_test.go

@@ -0,0 +1,72 @@
+// Copyright (c) 2017 Intel Corporation
+//
+// SPDX-License-Identifier: Apache-2.0
+//
+
+package main
+
+import (
+	"io/ioutil"
+	"os"
+	"syscall"
+	"testing"
+
+	"github.com/stretchr/testify/assert"
+	"golang.org/x/sys/unix"
+)
+
+const (
+	RawModeErr      = "should be properly set in raw mode"
+	FlagRawModeErr  = "flag " + RawModeErr
+	ValueRawModeErr = "value " + RawModeErr
+)
+
+func newTestTerminal(t *testing.T) (*os.File, error) {
+	if os.Getuid() != 0 {
+		t.Skip("Skipping this test: Requires to be root")
+		return nil, nil
+	}
+
+	return os.OpenFile("/dev/tty", os.O_RDWR, os.ModeDevice)
+}
+
+func TestSetupTerminalOnNonTerminalFailure(t *testing.T) {
+	file, err := ioutil.TempFile("", "tmp")
+	assert.Nil(t, err, "Failed to create temporary file")
+	defer file.Close()
+
+	_, err = setupTerminal(int(file.Fd()))
+	assert.NotNil(t, err, "Should fail because the file is not a terminal")
+}
+
+func TestSetupTerminalSuccess(t *testing.T) {
+	file, err := newTestTerminal(t)
+
+	if perr, ok := err.(*os.PathError); ok {
+		switch perr.Err.(syscall.Errno) {
+		case syscall.ENXIO:
+			t.Skip("Skipping this test: Failed to open tty, make sure test is running in a tty")
+		default:
+			t.Fatalf("could not open tty %s", err)
+		}
+	}
+
+	assert.Nil(t, err, "Failed to create terminal")
+	defer file.Close()
+
+	savedTermios, err := setupTerminal(int(file.Fd()))
+	assert.Nil(t, err, "Should not fail because the file is a terminal")
+
+	termios, err := unix.IoctlGetTermios(int(file.Fd()), unix.TIOCGETA)
+	assert.Nil(t, err, "Failed to get terminal information")
+	assert.True(t, (termios.Iflag&termiosIFlagRawTermInvMask) == 0, "Termios I %s", FlagRawModeErr)
+	assert.True(t, (termios.Oflag&termiosOFlagRawTermInvMask) == 0, "Termios O %s", FlagRawModeErr)
+	assert.True(t, (termios.Lflag&termiosLFlagRawTermInvMask) == 0, "Termios L %s", FlagRawModeErr)
+	assert.True(t, (termios.Cflag&termiosCFlagRawTermInvMask) == 0, "Termios C %s", FlagRawModeErr)
+	assert.True(t, (termios.Cflag&termiosCFlagRawTermMask) == termiosCFlagRawTermMask, "Termios C %s", FlagRawModeErr)
+	assert.True(t, termios.Cc[unix.VMIN] == termiosCcVMinRawTermVal, "Termios CC VMIN %s", ValueRawModeErr)
+	assert.True(t, termios.Cc[unix.VTIME] == termiosCcVTimeRawTermVal, "Termios CC VTIME %s", ValueRawModeErr)
+
+	err = restoreTerminal(int(file.Fd()), savedTermios)
+	assert.Nil(t, err, "Terminal should be properly restored")
+}