Add tar.Headers.Winheaders for Windows metadata

archive/tar/common.go

@@ -59,6 +59,7 @@ type Header struct {
 	AccessTime time.Time // access time
 	ChangeTime time.Time // status change time
 	Xattrs     map[string]string
+	Winheaders map[string]string
 }
 
 // File name constants from the tar spec.
@@ -192,6 +193,7 @@ const (
 	paxUid      = "uid"
 	paxUname    = "uname"
 	paxXattr    = "SCHILY.xattr."
+	paxWindows  = "MSWINDOWS."
 	paxNone     = ""
 )
 

archive/tar/reader.go

@@ -314,6 +314,11 @@ func mergePAX(hdr *Header, headers map[string]string) error {
 					hdr.Xattrs = make(map[string]string)
 				}
 				hdr.Xattrs[k[len(paxXattr):]] = v
+			} else if strings.HasPrefix(k, paxWindows) {
+				if hdr.Winheaders == nil {
+					hdr.Winheaders = make(map[string]string)
+				}
+				hdr.Winheaders[k[len(paxWindows):]] = v
 			}
 		}
 	}

archive/tar/writer.go

@@ -268,6 +268,9 @@ func (tw *Writer) writeHeader(hdr *Header, allowPax bool) error {
 		for k, v := range hdr.Xattrs {
 			paxHeaders[paxXattr+k] = v
 		}
+		for k, v := range hdr.Winheaders {
+			paxHeaders[paxWindows+k] = v
+		}
 	}
 
 	if len(paxHeaders) > 0 {