From patchwork Sat Mar 19 01:34:20 2016 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit Subject: chgserver: use old ui.system if fout is not stdout or needs to be captured From: Jun Wu X-Patchwork-Id: 13945 Message-Id: To: Date: Fri, 18 Mar 2016 18:34:20 -0700 # HG changeset patch # User Jun Wu # Date 1458239268 0 # Thu Mar 17 18:27:48 2016 +0000 # Node ID c185fae7a1ef85f64d98478a7e5efecb5ca33c8f # Parent 1435a8e9b5fe38cfe900e0a75fefab046af73dd6 chgserver: use old ui.system if fout is not stdout or needs to be captured Before this patch, chgui will override the system method, forwarding every process execution to the client so sessions and process groups can work as expected. But the chg client will just use stdout, if ui.fout is not stdout or if the output is set to be captured to safe._buffers, the client will not behave correctly. This can happen especially with code prepending "remote:". For example, bundle2 uses ui.pushbuffer, and sshpeer sets fout to ferr. We may have trouble with interactive commands in the fout set to ferr case but if it really bites us, we can always send file descriptors to the client. This patch adds a check to detect the above situations and fallback to the old ui.system if so. It will make chg happy with test-bundle2-exchange.t, test-phases-exchange.t, test-ssh-bundle1.t and test-ssh.t. diff --git a/hgext/chgserver.py b/hgext/chgserver.py --- a/hgext/chgserver.py +++ b/hgext/chgserver.py @@ -235,6 +235,14 @@ def system(self, cmd, environ=None, cwd=None, onerr=None, errprefix=None): + # fallback to the original system method if the output needs to be + # captured (to self._buffers), or the output stream is not stdout + # (e.g. stderr, cStringIO), because the chg client is not aware of + # these situations and will behave differently (write to stdout). + if any(s[1] for s in self._bufferstates) or \ + self.fout.getattr('fileno', -1) != sys.stdout.fileno(): + return super(chgui, self).system(cmd, environ, cwd, onerr, + errprefix) # copied from mercurial/util.py:system() self.flush() def py2shell(val):