diff -r 08630dd719f9 -r 607e9322fc89 mercurial/hg.py
--- a/mercurial/hg.py	Fri Oct 15 02:36:54 2021 +0200
+++ b/mercurial/hg.py	Fri Oct 15 02:44:14 2021 +0200
@@ -1261,13 +1261,14 @@
         (remoterepo, incomingchangesetlist, displayer) parameters,
     and is supposed to contain only code that can't be unified.
     """
-    srcs = urlutil.get_pull_paths(repo, ui, [source], opts.get(b'branch'))
+    srcs = urlutil.get_pull_paths(repo, ui, [source])
     srcs = list(srcs)
     if len(srcs) != 1:
         msg = _(b'for now, incoming supports only a single source, %d provided')
         msg %= len(srcs)
         raise error.Abort(msg)
-    source, branches = srcs[0]
+    path = srcs[0]
+    source, branches = urlutil.parseurl(path.rawloc, opts.get(b'branch'))
     if subpath is not None:
         subpath = urlutil.url(subpath)
         if subpath.isabs():