virtcontainers: Initial import

This is a virtcontainers 1.0.8 import into Kata Containers runtime.

virtcontainers is a Go library designed to manage hardware virtualized
pods and containers. It is the core Clear Containers framework and will
become the core Kata Containers framework, as discussed at
https://github.com/kata-containers/runtime/issues/33

Some more more pointers:

virtcontainers README, including some design and architecure notes:
https://github.com/containers/virtcontainers/blob/master/README.md

virtcontainers 1.0 API:
https://github.com/containers/virtcontainers/blob/master/documentation/api/1.0/api.md

Fixes #40

Signed-off-by: Samuel Ortiz <sameo@linux.intel.com>

virtcontainers/syscall_test.go

@@ -0,0 +1,180 @@
+//
+// Copyright 2015 The rkt Authors
+// Copyright (c) 2016 Intel Corporation
+//
+// 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 virtcontainers
+
+import (
+	"os"
+	"path/filepath"
+	"syscall"
+	"testing"
+)
+
+func TestBindMountInvalidSourceSymlink(t *testing.T) {
+	source := filepath.Join(testDir, "fooFile")
+	os.Remove(source)
+
+	err := bindMount(source, "", false)
+	if err == nil {
+		t.Fatal()
+	}
+}
+
+func TestBindMountFailingMount(t *testing.T) {
+	source := filepath.Join(testDir, "fooLink")
+	fakeSource := filepath.Join(testDir, "fooFile")
+	os.Remove(source)
+	os.Remove(fakeSource)
+
+	_, err := os.OpenFile(fakeSource, os.O_CREATE, mountPerm)
+	if err != nil {
+		t.Fatal(err)
+	}
+
+	err = os.Symlink(fakeSource, source)
+	if err != nil {
+		t.Fatal(err)
+	}
+
+	err = bindMount(source, "", false)
+	if err == nil {
+		t.Fatal()
+	}
+}
+
+func TestBindMountSuccessful(t *testing.T) {
+	if os.Geteuid() != 0 {
+		t.Skip(testDisabledAsNonRoot)
+	}
+
+	source := filepath.Join(testDir, "fooDirSrc")
+	dest := filepath.Join(testDir, "fooDirDest")
+	syscall.Unmount(dest, 0)
+	os.Remove(source)
+	os.Remove(dest)
+
+	err := os.MkdirAll(source, mountPerm)
+	if err != nil {
+		t.Fatal(err)
+	}
+
+	err = os.MkdirAll(dest, mountPerm)
+	if err != nil {
+		t.Fatal(err)
+	}
+
+	err = bindMount(source, dest, false)
+	if err != nil {
+		t.Fatal(err)
+	}
+
+	syscall.Unmount(dest, 0)
+}
+
+func TestBindMountReadonlySuccessful(t *testing.T) {
+	if os.Geteuid() != 0 {
+		t.Skip(testDisabledAsNonRoot)
+	}
+
+	source := filepath.Join(testDir, "fooDirSrc")
+	dest := filepath.Join(testDir, "fooDirDest")
+	syscall.Unmount(dest, 0)
+	os.Remove(source)
+	os.Remove(dest)
+
+	err := os.MkdirAll(source, mountPerm)
+	if err != nil {
+		t.Fatal(err)
+	}
+
+	err = os.MkdirAll(dest, mountPerm)
+	if err != nil {
+		t.Fatal(err)
+	}
+
+	err = bindMount(source, dest, true)
+	if err != nil {
+		t.Fatal(err)
+	}
+
+	defer syscall.Unmount(dest, 0)
+
+	// should not be able to create file in read-only mount
+	destFile := filepath.Join(dest, "foo")
+	_, err = os.OpenFile(destFile, os.O_CREATE, mountPerm)
+	if err == nil {
+		t.Fatal(err)
+	}
+}
+
+func TestEnsureDestinationExistsNonExistingSource(t *testing.T) {
+	err := ensureDestinationExists("", "")
+	if err == nil {
+		t.Fatal()
+	}
+}
+
+func TestEnsureDestinationExistsWrongParentDir(t *testing.T) {
+	source := filepath.Join(testDir, "fooFile")
+	dest := filepath.Join(source, "fooDest")
+	os.Remove(source)
+	os.Remove(dest)
+
+	_, err := os.OpenFile(source, os.O_CREATE, mountPerm)
+	if err != nil {
+		t.Fatal(err)
+	}
+
+	err = ensureDestinationExists(source, dest)
+	if err == nil {
+		t.Fatal()
+	}
+}
+
+func TestEnsureDestinationExistsSuccessfulSrcDir(t *testing.T) {
+	source := filepath.Join(testDir, "fooDirSrc")
+	dest := filepath.Join(testDir, "fooDirDest")
+	os.Remove(source)
+	os.Remove(dest)
+
+	err := os.MkdirAll(source, mountPerm)
+	if err != nil {
+		t.Fatal(err)
+	}
+
+	err = ensureDestinationExists(source, dest)
+	if err != nil {
+		t.Fatal(err)
+	}
+}
+
+func TestEnsureDestinationExistsSuccessfulSrcFile(t *testing.T) {
+	source := filepath.Join(testDir, "fooDirSrc")
+	dest := filepath.Join(testDir, "fooDirDest")
+	os.Remove(source)
+	os.Remove(dest)
+
+	_, err := os.OpenFile(source, os.O_CREATE, mountPerm)
+	if err != nil {
+		t.Fatal(err)
+	}
+
+	err = ensureDestinationExists(source, dest)
+	if err != nil {
+		t.Fatal(err)
+	}
+}