github.com/containerd/Containerd@v1.4.13/mount/mount_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  	"reflect"
    28  	"testing"
    29  
    30  	"github.com/containerd/continuity/testutil"
    31  )
    32  
    33  func TestLongestCommonPrefix(t *testing.T) {
    34  	tcases := []struct {
    35  		in       []string
    36  		expected string
    37  	}{
    38  		{[]string{}, ""},
    39  		{[]string{"foo"}, "foo"},
    40  		{[]string{"foo", "bar"}, ""},
    41  		{[]string{"foo", "foo"}, "foo"},
    42  		{[]string{"foo", "foobar"}, "foo"},
    43  		{[]string{"foo", "", "foobar"}, ""},
    44  	}
    45  
    46  	for i, tc := range tcases {
    47  		if got := longestCommonPrefix(tc.in); got != tc.expected {
    48  			t.Fatalf("[%d case] expected (%s), but got (%s)", i+1, tc.expected, got)
    49  		}
    50  	}
    51  }
    52  
    53  func TestCompactLowerdirOption(t *testing.T) {
    54  	tcases := []struct {
    55  		opts      []string
    56  		commondir string
    57  		newopts   []string
    58  	}{
    59  		// no lowerdir or only one
    60  		{
    61  			[]string{"workdir=a"},
    62  			"",
    63  			[]string{"workdir=a"},
    64  		},
    65  		{
    66  			[]string{"workdir=a", "lowerdir=b"},
    67  			"",
    68  			[]string{"workdir=a", "lowerdir=b"},
    69  		},
    70  
    71  		// >= 2 lowerdir
    72  		{
    73  			[]string{"lowerdir=/snapshots/1/fs:/snapshots/10/fs"},
    74  			"/snapshots/",
    75  			[]string{"lowerdir=1/fs:10/fs"},
    76  		},
    77  		{
    78  			[]string{"lowerdir=/snapshots/1/fs:/snapshots/10/fs:/snapshots/2/fs"},
    79  			"/snapshots/",
    80  			[]string{"lowerdir=1/fs:10/fs:2/fs"},
    81  		},
    82  
    83  		// if common dir is /
    84  		{
    85  			[]string{"lowerdir=/snapshots/1/fs:/other_snapshots/1/fs"},
    86  			"",
    87  			[]string{"lowerdir=/snapshots/1/fs:/other_snapshots/1/fs"},
    88  		},
    89  	}
    90  
    91  	for i, tc := range tcases {
    92  		dir, opts := compactLowerdirOption(tc.opts)
    93  		if dir != tc.commondir {
    94  			t.Fatalf("[%d case] expected common dir (%s), but got (%s)", i+1, tc.commondir, dir)
    95  		}
    96  
    97  		if !reflect.DeepEqual(opts, tc.newopts) {
    98  			t.Fatalf("[%d case] expected options (%v), but got (%v)", i+1, tc.newopts, opts)
    99  		}
   100  	}
   101  }
   102  
   103  func TestFUSEHelper(t *testing.T) {
   104  	testutil.RequiresRoot(t)
   105  	const fuseoverlayfsBinary = "fuse-overlayfs"
   106  	_, err := exec.LookPath(fuseoverlayfsBinary)
   107  	if err != nil {
   108  		t.Skip("fuse-overlayfs not installed")
   109  	}
   110  	td, err := ioutil.TempDir("", "fuse")
   111  	if err != nil {
   112  		t.Fatal(err)
   113  	}
   114  	defer func() {
   115  		if err := os.RemoveAll(td); err != nil {
   116  			t.Fatal(err)
   117  		}
   118  	}()
   119  
   120  	for _, dir := range []string{"lower1", "lower2", "upper", "work", "merged"} {
   121  		if err := os.Mkdir(filepath.Join(td, dir), 0755); err != nil {
   122  			t.Fatal(err)
   123  		}
   124  	}
   125  
   126  	opts := fmt.Sprintf("lowerdir=%s:%s,upperdir=%s,workdir=%s", filepath.Join(td, "lower2"), filepath.Join(td, "lower1"), filepath.Join(td, "upper"), filepath.Join(td, "work"))
   127  	m := Mount{
   128  		Type:    "fuse3." + fuseoverlayfsBinary,
   129  		Source:  "overlay",
   130  		Options: []string{opts},
   131  	}
   132  	dest := filepath.Join(td, "merged")
   133  	if err := m.Mount(dest); err != nil {
   134  		t.Fatal(err)
   135  	}
   136  	if err := UnmountAll(dest, 0); err != nil {
   137  		t.Fatal(err)
   138  	}
   139  }