github.com/xdlianrong208/docker-ce-comments@v17.12.1-ce-rc2+incompatible/components/engine/layer/filestore_test.go (about)

     1  package layer
     2  
     3  import (
     4  	"fmt"
     5  	"io/ioutil"
     6  	"math/rand"
     7  	"os"
     8  	"path/filepath"
     9  	"strings"
    10  	"syscall"
    11  	"testing"
    12  
    13  	"github.com/opencontainers/go-digest"
    14  )
    15  
    16  func randomLayerID(seed int64) ChainID {
    17  	r := rand.New(rand.NewSource(seed))
    18  
    19  	return ChainID(digest.FromBytes([]byte(fmt.Sprintf("%d", r.Int63()))))
    20  }
    21  
    22  func newFileMetadataStore(t *testing.T) (*fileMetadataStore, string, func()) {
    23  	td, err := ioutil.TempDir("", "layers-")
    24  	if err != nil {
    25  		t.Fatal(err)
    26  	}
    27  	fms, err := NewFSMetadataStore(td)
    28  	if err != nil {
    29  		t.Fatal(err)
    30  	}
    31  
    32  	return fms.(*fileMetadataStore), td, func() {
    33  		if err := os.RemoveAll(td); err != nil {
    34  			t.Logf("Failed to cleanup %q: %s", td, err)
    35  		}
    36  	}
    37  }
    38  
    39  func assertNotDirectoryError(t *testing.T, err error) {
    40  	perr, ok := err.(*os.PathError)
    41  	if !ok {
    42  		t.Fatalf("Unexpected error %#v, expected path error", err)
    43  	}
    44  
    45  	if perr.Err != syscall.ENOTDIR {
    46  		t.Fatalf("Unexpected error %s, expected %s", perr.Err, syscall.ENOTDIR)
    47  	}
    48  }
    49  
    50  func TestCommitFailure(t *testing.T) {
    51  	fms, td, cleanup := newFileMetadataStore(t)
    52  	defer cleanup()
    53  
    54  	if err := ioutil.WriteFile(filepath.Join(td, "sha256"), []byte("was here first!"), 0644); err != nil {
    55  		t.Fatal(err)
    56  	}
    57  
    58  	tx, err := fms.StartTransaction()
    59  	if err != nil {
    60  		t.Fatal(err)
    61  	}
    62  
    63  	if err := tx.SetSize(0); err != nil {
    64  		t.Fatal(err)
    65  	}
    66  
    67  	err = tx.Commit(randomLayerID(5))
    68  	if err == nil {
    69  		t.Fatalf("Expected error committing with invalid layer parent directory")
    70  	}
    71  	assertNotDirectoryError(t, err)
    72  }
    73  
    74  func TestStartTransactionFailure(t *testing.T) {
    75  	fms, td, cleanup := newFileMetadataStore(t)
    76  	defer cleanup()
    77  
    78  	if err := ioutil.WriteFile(filepath.Join(td, "tmp"), []byte("was here first!"), 0644); err != nil {
    79  		t.Fatal(err)
    80  	}
    81  
    82  	_, err := fms.StartTransaction()
    83  	if err == nil {
    84  		t.Fatalf("Expected error starting transaction with invalid layer parent directory")
    85  	}
    86  	assertNotDirectoryError(t, err)
    87  
    88  	if err := os.Remove(filepath.Join(td, "tmp")); err != nil {
    89  		t.Fatal(err)
    90  	}
    91  
    92  	tx, err := fms.StartTransaction()
    93  	if err != nil {
    94  		t.Fatal(err)
    95  	}
    96  
    97  	if expected := filepath.Join(td, "tmp"); strings.HasPrefix(expected, tx.String()) {
    98  		t.Fatalf("Unexpected transaction string %q, expected prefix %q", tx.String(), expected)
    99  	}
   100  
   101  	if err := tx.Cancel(); err != nil {
   102  		t.Fatal(err)
   103  	}
   104  }