github.com/reds/docker@v1.11.2-rc1/layer/layer_unix_test.go (about)

     1  // +build !windows
     2  
     3  package layer
     4  
     5  import "testing"
     6  
     7  func graphDiffSize(ls Store, l Layer) (int64, error) {
     8  	cl := getCachedLayer(l)
     9  	var parent string
    10  	if cl.parent != nil {
    11  		parent = cl.parent.cacheID
    12  	}
    13  	return ls.(*layerStore).driver.DiffSize(cl.cacheID, parent)
    14  }
    15  
    16  // Unix as Windows graph driver does not support Changes which is indirectly
    17  // invoked by calling DiffSize on the driver
    18  func TestLayerSize(t *testing.T) {
    19  	ls, _, cleanup := newTestStore(t)
    20  	defer cleanup()
    21  
    22  	content1 := []byte("Base contents")
    23  	content2 := []byte("Added contents")
    24  
    25  	layer1, err := createLayer(ls, "", initWithFiles(newTestFile("file1", content1, 0644)))
    26  	if err != nil {
    27  		t.Fatal(err)
    28  	}
    29  
    30  	layer2, err := createLayer(ls, layer1.ChainID(), initWithFiles(newTestFile("file2", content2, 0644)))
    31  	if err != nil {
    32  		t.Fatal(err)
    33  	}
    34  
    35  	layer1DiffSize, err := graphDiffSize(ls, layer1)
    36  	if err != nil {
    37  		t.Fatal(err)
    38  	}
    39  
    40  	if int(layer1DiffSize) != len(content1) {
    41  		t.Fatalf("Unexpected diff size %d, expected %d", layer1DiffSize, len(content1))
    42  	}
    43  
    44  	layer1Size, err := layer1.Size()
    45  	if err != nil {
    46  		t.Fatal(err)
    47  	}
    48  
    49  	if expected := len(content1); int(layer1Size) != expected {
    50  		t.Fatalf("Unexpected size %d, expected %d", layer1Size, expected)
    51  	}
    52  
    53  	layer2DiffSize, err := graphDiffSize(ls, layer2)
    54  	if err != nil {
    55  		t.Fatal(err)
    56  	}
    57  
    58  	if int(layer2DiffSize) != len(content2) {
    59  		t.Fatalf("Unexpected diff size %d, expected %d", layer2DiffSize, len(content2))
    60  	}
    61  
    62  	layer2Size, err := layer2.Size()
    63  	if err != nil {
    64  		t.Fatal(err)
    65  	}
    66  
    67  	if expected := len(content1) + len(content2); int(layer2Size) != expected {
    68  		t.Fatalf("Unexpected size %d, expected %d", layer2Size, expected)
    69  	}
    70  
    71  }