Add support for extracting xattrs on unix

extractor/tgz_extractor.go

@@ -105,5 +105,9 @@ func extractTarArchiveFile(header *tar.Header, dest string, input io.Reader) err
 	defer fileCopy.Close()
 
 	_, err = io.Copy(fileCopy, input)
-	return err
+	if err != nil {
+		return err
+	}
+
+	return setXattrsFromTar(filePath, header)
 }

extractor/xattr_unix.go

@@ -0,0 +1,29 @@
+//go:build unix
+
+package extractor
+
+import (
+	"archive/tar"
+	"errors"
+	"strings"
+	"syscall"
+
+	"golang.org/x/sys/unix"
+)
+
+func setXattrsFromTar(path string, hdr *tar.Header) (err error) {
+	const paxSchilyXattr = "SCHILY.xattr."
+
+	for key, value := range hdr.PAXRecords {
+		if !strings.HasPrefix(key, paxSchilyXattr) {
+			continue
+		}
+
+		err = unix.Lsetxattr(path, key[len(paxSchilyXattr):], []byte(value), 0)
+		if err != nil && !errors.Is(err, syscall.ENOTSUP) && !errors.Is(err, syscall.EPERM) {
+			return err
+		}
+	}
+
+	return nil
+}

extractor/xattr_windows.go

@@ -0,0 +1,9 @@
+//go:build windows
+
+package extractor
+
+import "archive/tar"
+
+func setXattrsFromTar(_ string, _ *tar.Header) error {
+	return nil
+}