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// Copyright 2018 Google Inc.
//
// 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 root is used for tests that requires sysadmin privileges run. First,
// follow the setup instruction in runsc/test/README.md. To run these test:
//
// bazel build //runsc/test/root:root_test
// root_test=$(find -L ./bazel-bin/ -executable -type f -name root_test | grep __main__)
// sudo RUNSC_RUNTIME=runsc-test ${root_test}
package root
import (
"fmt"
"io/ioutil"
"os"
"path/filepath"
"reflect"
"sort"
"strconv"
"strings"
"testing"
"github.com/syndtr/gocapability/capability"
"gvisor.googlesource.com/gvisor/runsc/specutils"
"gvisor.googlesource.com/gvisor/runsc/test/testutil"
)
// TestChroot verifies that the sandbox is chroot'd and that mounts are cleaned
// up after the sandbox is destroyed.
func TestChroot(t *testing.T) {
d := testutil.MakeDocker("chroot-test")
if err := d.Run("alpine", "sleep", "10000"); err != nil {
t.Fatalf("docker run failed: %v", err)
}
defer d.CleanUp()
pid, err := d.SandboxPid()
if err != nil {
t.Fatalf("Docker.SandboxPid(): %v", err)
}
// Check that sandbox is chroot'ed.
chroot, err := filepath.EvalSymlinks(filepath.Join("/proc", strconv.Itoa(pid), "root"))
if err != nil {
t.Fatalf("error resolving /proc/<pid>/root symlink: %v", err)
}
if want := "/tmp/runsc-sandbox-chroot-"; !strings.HasPrefix(chroot, want) {
t.Errorf("sandbox is not chroot'd, it should be inside: %q, got: %q", want, chroot)
}
path, err := filepath.EvalSymlinks(filepath.Join("/proc", strconv.Itoa(pid), "cwd"))
if err != nil {
t.Fatalf("error resolving /proc/<pid>/cwd symlink: %v", err)
}
if chroot != path {
t.Errorf("sandbox current dir is wrong, want: %q, got: %q", chroot, path)
}
fi, err := ioutil.ReadDir(chroot)
if err != nil {
t.Fatalf("error listing %q: %v", chroot, err)
}
if want, got := 2, len(fi); want != got {
t.Fatalf("chroot dir got %d entries, want %d", want, got)
}
// chroot dir is prepared by runsc and should contains only the executable
// and /proc.
files := []string{fi[0].Name(), fi[1].Name()}
sort.Strings(files)
if want := []string{"proc", "runsc"}; !reflect.DeepEqual(files, want) {
t.Errorf("chroot got children %v, want %v", files, want)
}
d.CleanUp()
// Check that chroot directory was cleaned up.
if _, err := os.Stat(chroot); err == nil || !os.IsNotExist(err) {
t.Errorf("chroot directory %q was not deleted: %v", chroot, err)
}
}
func TestMain(m *testing.M) {
testutil.EnsureSupportedDockerVersion()
if !specutils.HasCapabilities(capability.CAP_SYS_ADMIN, capability.CAP_DAC_OVERRIDE) {
fmt.Println("Test requires sysadmin privileges to run. Try again with sudo.")
os.Exit(1)
}
os.Exit(m.Run())
}
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