stream: double check that self.vfs is *not* in the vfsmap...
stream: double check that self.vfs is *not* in the vfsmap
The stream clone logic allows for writing any content to any file under various
vfs. This is *not* suitable for *vfs*, since writing in `.hg/` directly allow to
modify the configuration and is a great and simple gateway for remote code
execution.
Differential Revision:
https://phab.mercurial-scm.org/D10905