Fix uses of "int" where "int64" should be used instead

Some structures use int for sizes and UNIX timestamps. On some
platforms, int is 32 bits, so this can lead to the year 2038 issues and
overflows when dealing with large containers or layers.

Consistently use int64 to store sizes and UNIX timestamps in
api/types/types.go. Update related to code accordingly (i.e.
strconv.FormatInt instead of strconv.Itoa).

Use int64 in progressreader package to avoid integer overflow when
dealing with large quantities. Update related code accordingly.

Signed-off-by: Aaron Lehmann <aaron.lehmann@docker.com>

pkg/progressreader/progressreader.go

@@ -14,9 +14,9 @@ type Config struct {
 	In         io.ReadCloser // Stream to read from
 	Out        io.Writer     // Where to send progress bar to
 	Formatter  *streamformatter.StreamFormatter
-	Size       int
-	Current    int
-	LastUpdate int
+	Size       int64
+	Current    int64
+	LastUpdate int64
 	NewLines   bool
 	ID         string
 	Action     string
@@ -29,11 +29,11 @@ func New(newReader Config) *Config {
 
 func (config *Config) Read(p []byte) (n int, err error) {
 	read, err := config.In.Read(p)
-	config.Current += read
-	updateEvery := 1024 * 512 //512kB
+	config.Current += int64(read)
+	updateEvery := int64(1024 * 512) //512kB
 	if config.Size > 0 {
 		// Update progress for every 1% read if 1% < 512kB
-		if increment := int(0.01 * float64(config.Size)); increment < updateEvery {
+		if increment := int64(0.01 * float64(config.Size)); increment < updateEvery {
 			updateEvery = increment
 		}
 	}

pkg/progressreader/progressreader_test.go

@@ -20,7 +20,7 @@ func TestOutputOnPrematureClose(t *testing.T) {
 		In:        reader,
 		Out:       writer,
 		Formatter: streamformatter.NewStreamFormatter(),
-		Size:      len(content),
+		Size:      int64(len(content)),
 		NewLines:  true,
 		ID:        "Test",
 		Action:    "Read",
@@ -60,7 +60,7 @@ func TestCompleteSilently(t *testing.T) {
 		In:        reader,
 		Out:       writer,
 		Formatter: streamformatter.NewStreamFormatter(),
-		Size:      len(content),
+		Size:      int64(len(content)),
 		NewLines:  true,
 		ID:        "Test",
 		Action:    "Read",