github.com/lalkh/containerd@v1.4.3/mount/lookup_linux_test.go (about)

     1  // +build linux
     2  
     3  /*
     4     Copyright The containerd Authors.
     5  
     6     Licensed under the Apache License, Version 2.0 (the "License");
     7     you may not use this file except in compliance with the License.
     8     You may obtain a copy of the License at
     9  
    10         http://www.apache.org/licenses/LICENSE-2.0
    11  
    12     Unless required by applicable law or agreed to in writing, software
    13     distributed under the License is distributed on an "AS IS" BASIS,
    14     WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
    15     See the License for the specific language governing permissions and
    16     limitations under the License.
    17  */
    18  
    19  package mount
    20  
    21  import (
    22  	"fmt"
    23  	"io/ioutil"
    24  	"os"
    25  	"os/exec"
    26  	"path/filepath"
    27  	"strings"
    28  	"testing"
    29  
    30  	// containerd/pkg/testutil has circular dependency on this mount pkg.
    31  	// so we use continuity/testutil instead.
    32  	"github.com/containerd/continuity/testutil"
    33  	"github.com/containerd/continuity/testutil/loopback"
    34  	"gotest.tools/v3/assert"
    35  )
    36  
    37  func checkLookup(t *testing.T, fsType, mntPoint, dir string) {
    38  	t.Helper()
    39  	info, err := Lookup(dir)
    40  	assert.NilError(t, err)
    41  	assert.Equal(t, fsType, info.FSType)
    42  	assert.Equal(t, mntPoint, info.Mountpoint)
    43  }
    44  
    45  func testLookup(t *testing.T, fsType string) {
    46  	testutil.RequiresRoot(t)
    47  	mnt, err := ioutil.TempDir("", "containerd-mountinfo-test-lookup")
    48  	if err != nil {
    49  		t.Fatal(err)
    50  	}
    51  	defer os.RemoveAll(mnt)
    52  
    53  	loop, err := loopback.New(100 << 20) // 100 MB
    54  	if err != nil {
    55  		t.Fatal(err)
    56  	}
    57  	if out, err := exec.Command("mkfs", "-t", fsType, loop.Device).CombinedOutput(); err != nil {
    58  		// not fatal
    59  		loop.Close()
    60  		t.Skipf("could not mkfs (%s) %s: %v (out: %q)", fsType, loop.Device, err, string(out))
    61  	}
    62  	if out, err := exec.Command("mount", loop.Device, mnt).CombinedOutput(); err != nil {
    63  		// not fatal
    64  		loop.Close()
    65  		t.Skipf("could not mount %s: %v (out: %q)", loop.Device, err, string(out))
    66  	}
    67  	defer func() {
    68  		testutil.Unmount(t, mnt)
    69  		loop.Close()
    70  	}()
    71  	assert.Check(t, strings.HasPrefix(loop.Device, "/dev/loop"))
    72  	checkLookup(t, fsType, mnt, mnt)
    73  
    74  	newMnt, err := ioutil.TempDir("", "containerd-mountinfo-test-newMnt")
    75  	if err != nil {
    76  		t.Fatal(err)
    77  	}
    78  	defer os.RemoveAll(newMnt)
    79  
    80  	if out, err := exec.Command("mount", "--bind", mnt, newMnt).CombinedOutput(); err != nil {
    81  		t.Fatalf("could not mount %s to %s: %v (out: %q)", mnt, newMnt, err, string(out))
    82  	}
    83  	defer func() {
    84  		testutil.Unmount(t, newMnt)
    85  	}()
    86  	checkLookup(t, fsType, newMnt, newMnt)
    87  
    88  	subDir := filepath.Join(newMnt, "subDir")
    89  	err = os.MkdirAll(subDir, 0700)
    90  	if err != nil {
    91  		t.Fatal(err)
    92  	}
    93  	checkLookup(t, fsType, newMnt, subDir)
    94  }
    95  
    96  func TestLookupWithExt4(t *testing.T) {
    97  	testLookup(t, "ext4")
    98  }
    99  
   100  func TestLookupWithXFS(t *testing.T) {
   101  	testLookup(t, "xfs")
   102  }
   103  
   104  func TestLookupWithOverlay(t *testing.T) {
   105  	lower, err := ioutil.TempDir("", "containerd-mountinfo-test-lower")
   106  	assert.NilError(t, err)
   107  	defer os.RemoveAll(lower)
   108  
   109  	upper, err := ioutil.TempDir("", "containerd-mountinfo-test-upper")
   110  	assert.NilError(t, err)
   111  	defer os.RemoveAll(upper)
   112  
   113  	work, err := ioutil.TempDir("", "containerd-mountinfo-test-work")
   114  	assert.NilError(t, err)
   115  	defer os.RemoveAll(work)
   116  
   117  	overlay, err := ioutil.TempDir("", "containerd-mountinfo-test-overlay")
   118  	assert.NilError(t, err)
   119  	defer os.RemoveAll(overlay)
   120  
   121  	if out, err := exec.Command("mount", "-t", "overlay", "overlay", "-o", fmt.Sprintf("lowerdir=%s,upperdir=%s,workdir=%s",
   122  		lower, upper, work), overlay).CombinedOutput(); err != nil {
   123  		// not fatal
   124  		t.Skipf("could not mount overlay: %v (out: %q)", err, string(out))
   125  	}
   126  	defer testutil.Unmount(t, overlay)
   127  
   128  	testdir := filepath.Join(overlay, "testdir")
   129  	err = os.Mkdir(testdir, 0777)
   130  	assert.NilError(t, err)
   131  
   132  	testfile := filepath.Join(overlay, "testfile")
   133  	_, err = os.Create(testfile)
   134  	assert.NilError(t, err)
   135  
   136  	checkLookup(t, "overlay", overlay, testdir)
   137  	checkLookup(t, "overlay", overlay, testfile)
   138  }