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// 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)
k.VFS().MustRegisterFilesystemType(sys.Name, sys.FilesystemType{}, &vfs.RegisterFilesystemTypeOptions{
AllowUserMount: true,
})
mns, err := k.VFS().NewMountNamespace(ctx, creds, "", sys.Name, &vfs.MountOptions{})
if err != nil {
t.Fatalf("Failed to create new mount namespace: %v", err)
}
return testutil.NewSystem(ctx, t, k.VFS(), 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\n", 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(s.Ctx)
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,
})
}
func TestCgroupMountpointExists(t *testing.T) {
// Note: The mountpoint is only created if cgroups are available. This is
// the VFS2 implementation of sysfs and the test runs with VFS2 enabled, so
// we expect to see the mount point unconditionally.
s := newTestSystem(t)
defer s.Destroy()
pop := s.PathOpAtRoot("/fs")
s.AssertAllDirentTypes(s.ListDirents(pop), map[string]testutil.DirentType{
"cgroup": linux.DT_DIR,
})
pop = s.PathOpAtRoot("/fs/cgroup")
s.AssertAllDirentTypes(s.ListDirents(pop), map[string]testutil.DirentType{ /*empty*/ })
}
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