1 files changed, 90 insertions, 0 deletions
diff --git a/pkg/sentry/fsimpl/sys/sys_test.go b/pkg/sentry/fsimpl/sys/sys_test.go
new file mode 100644
index 000000000..8b1cf0bd0
--- /dev/null
+++ b/pkg/sentry/fsimpl/sys/sys_test.go
@@ -0,0 +1,90 @@
+// Copyright 2019 The gVisor 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 sys_test
+
+import (
+	"fmt"
+	"testing"
+
+	"github.com/google/go-cmp/cmp"
+	"gvisor.dev/gvisor/pkg/abi/linux"
+	"gvisor.dev/gvisor/pkg/sentry/fsimpl/sys"
+	"gvisor.dev/gvisor/pkg/sentry/fsimpl/testutil"
+	"gvisor.dev/gvisor/pkg/sentry/kernel"
+	"gvisor.dev/gvisor/pkg/sentry/kernel/auth"
+	"gvisor.dev/gvisor/pkg/sentry/vfs"
+)
+
+func newTestSystem(t *testing.T) *testutil.System {
+	k, err := testutil.Boot()
+	if err != nil {
+		t.Fatalf("Failed to create test kernel: %v", err)
+	}
+	ctx := k.SupervisorContext()
+	creds := auth.CredentialsFromContext(ctx)
+	v := vfs.New()
+	v.MustRegisterFilesystemType("sysfs", sys.FilesystemType{}, &vfs.RegisterFilesystemTypeOptions{
+		AllowUserMount: true,
+	})
+
+	mns, err := v.NewMountNamespace(ctx, creds, "", "sysfs", &vfs.GetFilesystemOptions{})
+	if err != nil {
+		t.Fatalf("Failed to create new mount namespace: %v", err)
+	}
+	return testutil.NewSystem(ctx, t, v, mns)
+}
+
+func TestReadCPUFile(t *testing.T) {
+	s := newTestSystem(t)
+	defer s.Destroy()
+	k := kernel.KernelFromContext(s.Ctx)
+	maxCPUCores := k.ApplicationCores()
+
+	expected := fmt.Sprintf("0-%d", maxCPUCores-1)
+
+	for _, fname := range []string{"online", "possible", "present"} {
+		pop := s.PathOpAtRoot(fmt.Sprintf("devices/system/cpu/%s", fname))
+		fd, err := s.VFS.OpenAt(s.Ctx, s.Creds, pop, &vfs.OpenOptions{})
+		if err != nil {
+			t.Fatalf("OpenAt(pop:%+v) = %+v failed: %v", pop, fd, err)
+		}
+		defer fd.DecRef()
+		content, err := s.ReadToEnd(fd)
+		if err != nil {
+			t.Fatalf("Read failed: %v", err)
+		}
+		if diff := cmp.Diff(expected, content); diff != "" {
+			t.Fatalf("Read returned unexpected data:\n--- want\n+++ got\n%v", diff)
+		}
+	}
+}
+
+func TestSysRootContainsExpectedEntries(t *testing.T) {
+	s := newTestSystem(t)
+	defer s.Destroy()
+	pop := s.PathOpAtRoot("/")
+	s.AssertAllDirentTypes(s.ListDirents(pop), map[string]testutil.DirentType{
+		"block":    linux.DT_DIR,
+		"bus":      linux.DT_DIR,
+		"class":    linux.DT_DIR,
+		"dev":      linux.DT_DIR,
+		"devices":  linux.DT_DIR,
+		"firmware": linux.DT_DIR,
+		"fs":       linux.DT_DIR,
+		"kernel":   linux.DT_DIR,
+		"module":   linux.DT_DIR,
+		"power":    linux.DT_DIR,
+	})
+}