cmdutil: replace unix pipe handshake with file lock
The pipe handshake cannot be implemented with Windows detached process, which
disables handle inheritance.
Fix 2/3 for issue421
#!/usr/bin/env python
#
# Copyright 2009 Matt Mackall <mpm@selenic.com> and others
#
# This software may be used and distributed according to the terms of the
# GNU General Public License version 2, incorporated herein by reference.
"""prints repr(sys.stdin) but preserves newlines in input"""
import sys
print repr(sys.stdin.read())[1:-1].replace('\\n', '\n'),