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>

api/client/build.go

@@ -462,7 +462,7 @@ func getContextFromURL(out io.Writer, remoteURL, dockerfileName string) (absCont
 		In:        response.Body,
 		Out:       out,
 		Formatter: streamformatter.NewStreamFormatter(),
-		Size:      int(response.ContentLength),
+		Size:      response.ContentLength,
 		NewLines:  true,
 		ID:        "",
 		Action:    fmt.Sprintf("Downloading build context from remote url: %s", remoteURL),

api/client/ps/custom_test.go

@@ -27,7 +27,7 @@ func TestContainerContextID(t *testing.T) {
 		{types.Container{Image: "ubuntu"}, true, "ubuntu", imageHeader, ctx.Image},
 		{types.Container{Image: ""}, true, "<no image>", imageHeader, ctx.Image},
 		{types.Container{Command: "sh -c 'ls -la'"}, true, `"sh -c 'ls -la'"`, commandHeader, ctx.Command},
-		{types.Container{Created: int(unix)}, true, time.Unix(unix, 0).String(), createdAtHeader, ctx.CreatedAt},
+		{types.Container{Created: unix}, true, time.Unix(unix, 0).String(), createdAtHeader, ctx.CreatedAt},
 		{types.Container{Ports: []types.Port{{PrivatePort: 8080, PublicPort: 8080, Type: "tcp"}}}, true, "8080/tcp", portsHeader, ctx.Ports},
 		{types.Container{Status: "RUNNING"}, true, "RUNNING", statusHeader, ctx.Status},
 		{types.Container{SizeRw: 10}, true, "10 B", sizeHeader, ctx.Size},

api/types/types.go

@@ -70,9 +70,9 @@ type Image struct {
 	ParentId    string
 	RepoTags    []string
 	RepoDigests []string
-	Created     int
-	Size        int
-	VirtualSize int
+	Created     int64
+	Size        int64
+	VirtualSize int64
 	Labels      map[string]string
 }
 
@@ -112,10 +112,10 @@ type Container struct {
 	Names      []string
 	Image      string
 	Command    string
-	Created    int
+	Created    int64
 	Ports      []Port
-	SizeRw     int `json:",omitempty"`
-	SizeRootFs int `json:",omitempty"`
+	SizeRw     int64 `json:",omitempty"`
+	SizeRootFs int64 `json:",omitempty"`
 	Labels     map[string]string
 	Status     string
 	HostConfig struct {