# HG changeset patch
# User Gregory Szorc <gregory.szorc@gmail.com>
# Date 2018-10-02 19:43:54
# Node ID 51f10e6d66c726267b27100bb27022d4aaeadfe9
# Parent  83146d176c0346d88ed80cb66294e2029351a1a7

streamclone: don't support stream clone unless repo feature present

This change means custom repository types must opt in to enabling
stream clone. This seems reasonable, as stream clones are a very
low-level feature that has historically assumed the use of revlogs
and the layout of .hg/ that they entail.

Differential Revision: https://phab.mercurial-scm.org/D4853

diff --git a/mercurial/streamclone.py b/mercurial/streamclone.py
--- a/mercurial/streamclone.py
+++ b/mercurial/streamclone.py
@@ -18,6 +18,7 @@ from . import (
     error,
     phases,
     pycompat,
+    repository,
     store,
     util,
 )
@@ -178,6 +179,9 @@ def maybeperformlegacystreamclone(pullop
 
 def allowservergeneration(repo):
     """Whether streaming clones are allowed from the server."""
+    if repository.REPO_FEATURE_STREAM_CLONE not in repo.features:
+        return False
+
     if not repo.ui.configbool('server', 'uncompressed', untrusted=True):
         return False