github.com/opencontainers/umoci@v0.4.8-0.20240508124516-656e4836fb0d/oci/layer/generate_linux_test.go (about)

     1  //go:build linux
     2  // +build linux
     3  
     4  package layer
     5  
     6  import (
     7  	"archive/tar"
     8  	"io"
     9  	"io/ioutil"
    10  	"os"
    11  	"path"
    12  	"testing"
    13  
    14  	"github.com/opencontainers/umoci/pkg/fseval"
    15  	"github.com/opencontainers/umoci/pkg/system"
    16  	"github.com/stretchr/testify/assert"
    17  	"github.com/vbatts/go-mtree"
    18  	"golang.org/x/sys/unix"
    19  )
    20  
    21  func TestInsertLayerTranslateOverlayWhiteouts(t *testing.T) {
    22  	assert := assert.New(t)
    23  	dir, err := ioutil.TempDir("", "umoci-TestTranslateOverlayWhiteouts")
    24  	assert.NoError(err)
    25  	defer os.RemoveAll(dir)
    26  
    27  	mknodOk, err := canMknod(dir)
    28  	if err != nil {
    29  		t.Fatalf("couldn't mknod in dir: %v", err)
    30  	}
    31  
    32  	if !mknodOk {
    33  		t.Skip("skipping overlayfs test on kernel < 5.8")
    34  	}
    35  
    36  	testNode := path.Join(dir, "test")
    37  	err = system.Mknod(testNode, unix.S_IFCHR|0666, unix.Mkdev(0, 0))
    38  	assert.NoError(err)
    39  
    40  	packOptions := RepackOptions{TranslateOverlayWhiteouts: true}
    41  	reader := GenerateInsertLayer(dir, "/", false, &packOptions)
    42  	defer reader.Close()
    43  
    44  	tr := tar.NewReader(reader)
    45  	hdr, err := tr.Next()
    46  	assert.NoError(err)
    47  	assert.Equal(hdr.Name, "/")
    48  
    49  	hdr, err = tr.Next()
    50  	assert.NoError(err)
    51  
    52  	assert.Equal(int32(hdr.Typeflag), int32(tar.TypeReg))
    53  	assert.Equal(hdr.Name, whPrefix+"test")
    54  	_, err = tr.Next()
    55  	assert.Equal(err, io.EOF)
    56  }
    57  
    58  func TestGenerateLayerTranslateOverlayWhiteouts(t *testing.T) {
    59  	assert := assert.New(t)
    60  	dir, err := ioutil.TempDir("", "umoci-TestTranslateOverlayWhiteouts")
    61  	assert.NoError(err)
    62  	defer os.RemoveAll(dir)
    63  
    64  	mknodOk, err := canMknod(dir)
    65  	if err != nil {
    66  		t.Fatalf("couldn't mknod in dir: %v", err)
    67  	}
    68  
    69  	if !mknodOk {
    70  		t.Skip("skipping overlayfs test on kernel < 5.8")
    71  	}
    72  
    73  	testNode := path.Join(dir, "test")
    74  	err = system.Mknod(testNode, unix.S_IFCHR|0666, unix.Mkdev(0, 0))
    75  	assert.NoError(err)
    76  
    77  	packOptions := RepackOptions{TranslateOverlayWhiteouts: true}
    78  	// something reasonable
    79  	mtreeKeywords := []mtree.Keyword{
    80  		"size",
    81  		"type",
    82  		"uid",
    83  		"gid",
    84  		"mode",
    85  	}
    86  	deltas, err := mtree.Check(dir, nil, mtreeKeywords, fseval.Default)
    87  	assert.NoError(err)
    88  
    89  	reader, err := GenerateLayer(dir, deltas, &packOptions)
    90  	assert.NoError(err)
    91  	defer reader.Close()
    92  
    93  	tr := tar.NewReader(reader)
    94  
    95  	hdr, err := tr.Next()
    96  	assert.NoError(err)
    97  
    98  	assert.Equal(int32(hdr.Typeflag), int32(tar.TypeReg))
    99  	assert.Equal(path.Base(hdr.Name), whPrefix+"test")
   100  	_, err = tr.Next()
   101  	assert.Equal(err, io.EOF)
   102  }