util: simplify pipefilter and avoid subprocess race
The subprocess module is not thread safe. Spawning a thread to read
the output leads to exceptions like this when Mercurial exits:
Exception exceptions.TypeError: TypeError("'NoneType' object is not
callable",) in <bound method Popen.__del__ of <subprocess.Popen
object at 0x9ed0dcc>> ignored
The bug is already reported in the Python bug tracker:
http://bugs.python.org/issue1731717
#!/usr/bin/env python
#
# mercurial - scalable distributed SCM
#
# Copyright 2005-2007 Matt Mackall <mpm@selenic.com>
#
# This software may be used and distributed according to the terms of the
# GNU General Public License version 2, incorporated herein by reference.
# enable importing on demand to reduce startup time
try:
from mercurial import demandimport; demandimport.enable()
except ImportError:
import sys
sys.stderr.write("abort: couldn't find mercurial libraries in [%s]\n" %
' '.join(sys.path))
sys.stderr.write("(check your install and PYTHONPATH)\n")
sys.exit(-1)
import sys
import mercurial.util
import mercurial.dispatch
for fp in (sys.stdin, sys.stdout, sys.stderr):
mercurial.util.set_binary(fp)
mercurial.dispatch.run()