repository: don't loose file mode on write_archive()

Reference: libgit2#616
Signed-off-by: Igor Gnatenko <ignatenko@redhat.com>

pygit2/repository.py

@@ -37,6 +37,7 @@
 else:
     from io import BytesIO as StringIO
 
+import os
 import six
 
 # Import from pygit2
@@ -795,13 +796,13 @@ def write_archive(self, treeish, archive, timestamp=None, prefix=''):
         for entry in index:
             content = self[entry.id].read_raw()
             info = tarfile.TarInfo(prefix + entry.path)
+            info.mode = oct(os.stat(self[entry.id], follow_symlinks=False).st_mode & 0o777)
             info.size = len(content)
             info.mtime = timestamp
             info.uname = info.gname = 'root' # just because git does this
             if entry.mode == GIT_FILEMODE_LINK:
                 info.type = archive.SYMTYPE
                 info.linkname = content
-                info.mode = 0o777 # symlinks get placeholder
                 info.size = 0
                 archive.addfile(info)
             else: