Add glide.yaml and vendor deps

vendor/github.com/containers/image/copy/validate_gzip_test.go

@@ -0,0 +1,54 @@
+package copy
+
+import (
+	"bytes"
+	"compress/gzip"
+	"crypto/sha256"
+	"encoding/hex"
+	"fmt"
+	"io/ioutil"
+	"testing"
+
+	"github.com/stretchr/testify/assert"
+	"github.com/stretchr/testify/require"
+)
+
+// Verify that the GZIP writer results are consistent across golang versions
+//
+// * a large payload is used to ensure the compression code utilizes several blocks
+// * a small payload forces flushes in the compression code by using a partial block
+//
+// Verified against: go 1.7.3, go 1.6.3
+func TestGzipWriter(t *testing.T) {
+	cases := []struct {
+		name   string
+		digest string
+	}{
+		{"fixtures/random_512k.bin", "89ec079aa14317e6a96c53dc22081ec054c47533cea5858cc18644bfb148a363"},
+		{"fixtures/random_500b.bin", "0b3a69e34b8ea6d544b1686aaabdcb162a4e3ea597a320a32107b6eb74c125e1"},
+	}
+
+	for _, test := range cases {
+		payload, err := ioutil.ReadFile(test.name)
+		require.NoError(t, err, "failed to read payload from disk")
+
+		var buffer bytes.Buffer
+		zipper := gzip.NewWriter(&buffer)
+		_, err = zipper.Write(payload)
+		require.NoError(t, err, "failed to write payload to gzip.Writer")
+
+		// Flush and finialize all data being zipped
+		err = zipper.Close()
+		require.NoError(t, err, "failed to close gzip.Writer")
+
+		var actual bytes.Buffer
+		_, err = buffer.WriteTo(&actual)
+		require.NoError(t, err, "failed to retrieve payload")
+
+		sum := sha256.Sum256(actual.Bytes())
+		digest := hex.EncodeToString(sum[:])
+
+		// If checksum does not match then something has changed in the gzip library
+		assert.Equal(t, test.digest, digest, fmt.Sprintf("Invalid payload sha256: %v", test.name))
+	}
+}