# HG changeset patch
# User Augie Fackler <augie@google.com>
# Date 2019-12-05 21:19:16
# Node ID a89381e04c583f993f80814154a0834e6b1b6908
# Parent  f2de8dc9c52f5c9ea557efaabd6b8ed2a3b997ad

procutil: try and avoid angering CoreFoundation on macOS

We've seen failures like this:

    objc[57662]: +[__NSCFConstantString initialize] may have been in progress in another thread when fork() was called.
    objc[57662]: +[__NSCFConstantString initialize] may have been in progress in another thread when fork() was called. We cannot safely call it or ignore it in the fork() child process. Crashing instead. Set a breakpoint on objc_initializeAfterForkError to debug.

I think this is due to forking off some background processes during
`hg update` or similar. I don't have any conclusive proof this is the
fork() call that's to blame, but it's the most likely one since the
regular `hg update` codepath uses the other fork() invocation (via
workers) and we don't get this report from non-Google macOS users.

Ugh.

Differential Revision: https://phab.mercurial-scm.org/D7615

diff --git a/mercurial/utils/procutil.py b/mercurial/utils/procutil.py
--- a/mercurial/utils/procutil.py
+++ b/mercurial/utils/procutil.py
@@ -423,7 +423,10 @@ def system(cmd, environ=None, cwd=None, 
     return rc
 
 
-def gui():
+_is_gui = None
+
+
+def _gui():
     '''Are we running in a GUI?'''
     if pycompat.isdarwin:
         if b'SSH_CONNECTION' in encoding.environ:
@@ -439,6 +442,13 @@ def gui():
         return pycompat.iswindows or encoding.environ.get(b"DISPLAY")
 
 
+def gui():
+    global _is_gui
+    if _is_gui is None:
+        _is_gui = _gui()
+    return _is_gui
+
+
 def hgcmd():
     """Return the command used to execute current hg
 
@@ -583,6 +593,11 @@ else:
         `Subprocess.wait` function for the spawned process.  This is mostly
         useful for developers that need to make sure the spawned process
         finished before a certain point. (eg: writing test)'''
+        if pycompat.isdarwin:
+            # avoid crash in CoreFoundation in case another thread
+            # calls gui() while we're calling fork().
+            gui()
+
         # double-fork to completely detach from the parent process
         # based on http://code.activestate.com/recipes/278731
         if record_wait is None: