# HG changeset patch
# User Jun Wu <quark@fb.com>
# Date 1458239268 0
# Node ID 82cee85d5274f5ce63a74c9cb157ab2592bab332
# Parent  a3f3fdac84332e743f9fb930e4bc9ef3bb24e9f8
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 -r a3f3fdac8433 -r 82cee85d5274 hgext/chgserver.py
--- a/hgext/chgserver.py	Sat Mar 12 14:04:57 2016 -0800
+++ b/hgext/chgserver.py	Thu Mar 17 18:27:48 2016 +0000
@@ -235,6 +235,15 @@
 
         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 not util.safehasattr(self.fout, 'fileno')
+                or self.fout.fileno() != sys.stdout.fileno()):
+                return super(chgui, self).system(cmd, environ, cwd, onerr,
+                                                 errprefix)
             # copied from mercurial/util.py:system()
             self.flush()
             def py2shell(val):