archival: fixed archival generation at subpaths

vcsserver/remote/hg.py

@@ -1143,7 +1143,7 b' class HgRemote(RemoteBase):'
             if is_root:
                 matcher = alwaysmatcher(badfn=None)
             else:
-                matcher = patternmatcher('', [(b'glob', path+'/**', b'')], badfn=None)
+                matcher = patternmatcher('', [(b'glob', safe_bytes(path)+b'/**', b'')], badfn=None)
             file_iter = ctx.manifest().walk(matcher)
 
             for fn in file_iter: