Add a util/mount pkg

pkg/util/mount/linux_test.go

@@ -0,0 +1,93 @@
+// +build linux
+
+/*
+Copyright 2014 Google Inc. All rights reserved.
+
+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 mount
+
+import (
+	"strings"
+	"testing"
+)
+
+func TestReadProcMountsFrom(t *testing.T) {
+	successCase :=
+		`/dev/0 /path/to/0 type0 flags 0 0
+		/dev/1    /path/to/1   type1	flags 1 1
+		/dev/2 /path/to/2 type2 flags,1,2=3 2 2
+		`
+	hash, err := readProcMountsFrom(strings.NewReader(successCase), nil)
+	if err != nil {
+		t.Errorf("expected success")
+	}
+	if hash != 0xa3522051 {
+		t.Errorf("expected 0xa3522051, got %#x", hash)
+	}
+	mounts := []MountPoint{}
+	hash, err = readProcMountsFrom(strings.NewReader(successCase), &mounts)
+	if err != nil {
+		t.Errorf("expected success")
+	}
+	if hash != 0xa3522051 {
+		t.Errorf("expected 0xa3522051, got %#x", hash)
+	}
+	if len(mounts) != 3 {
+		t.Fatalf("expected 3 mounts, got %d", len(mounts))
+	}
+	mp := MountPoint{"/dev/0", "/path/to/0", "type0", []string{"flags"}, 0, 0}
+	if !mountPointsEqual(&mounts[0], &mp) {
+		t.Errorf("got unexpected MountPoint[0]: %#v", mounts[0])
+	}
+	mp = MountPoint{"/dev/1", "/path/to/1", "type1", []string{"flags"}, 1, 1}
+	if !mountPointsEqual(&mounts[1], &mp) {
+		t.Errorf("got unexpected MountPoint[1]: %#v", mounts[1])
+	}
+	mp = MountPoint{"/dev/2", "/path/to/2", "type2", []string{"flags", "1", "2=3"}, 2, 2}
+	if !mountPointsEqual(&mounts[2], &mp) {
+		t.Errorf("got unexpected MountPoint[2]: %#v", mounts[2])
+	}
+
+	errorCases := []string{
+		"/dev/0 /path/to/mount\n",
+		"/dev/1 /path/to/mount type flags a 0\n",
+		"/dev/2 /path/to/mount type flags 0 b\n",
+	}
+	for _, ec := range errorCases {
+		_, err := readProcMountsFrom(strings.NewReader(ec), &mounts)
+		if err == nil {
+			t.Errorf("expected error")
+		}
+	}
+}
+
+func mountPointsEqual(a, b *MountPoint) bool {
+	if a.Device != b.Device || a.Path != b.Path || a.Type != b.Type || !slicesEqual(a.Opts, b.Opts) || a.Pass != b.Pass || a.Freq != b.Freq {
+		return false
+	}
+	return true
+}
+
+func slicesEqual(a, b []string) bool {
+	if len(a) != len(b) {
+		return false
+	}
+	for i := range a {
+		if a[i] != b[i] {
+			return false
+		}
+	}
+	return true
+}