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redirect.py
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redirect.py
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#
# Copyright (c) 2010 Liraz Siri <liraz@turnkeylinux.org>
#
# This file is part of TKLBAM (TurnKey Linux BAckup and Migration).
#
# TKLBAM is open source software; you can redistribute it and/or
# modify it under the terms of the GNU General Public License as
# published by the Free Software Foundation; either version 3 of
# the License, or (at your option) any later version.
#
import os
import sys
class Redirect:
def __init__(self, origin, sink):
sink.flush()
origin.flush()
if sink.fileno() != origin.fileno():
self.dupfd = os.dup(origin.fileno())
os.dup2(sink.fileno(), origin.fileno())
self.sink = sink
self.origin = origin
def close(self):
if self.sink.fileno() != self.origin.fileno():
self.sink.flush()
self.origin.flush()
os.dup2(self.dupfd, self.origin.fileno())
os.close(self.dupfd)
class RedirectOutput:
def __init__(self, sink):
self.rstdout = Redirect(sys.stdout, sink)
self.rstderr = Redirect(sys.stderr, sink)
def close(self):
self.rstdout.close()
self.rstderr.close()
def test():
print "redirecting to /tmp/output"
fh = file("/tmp/output", "w")
print "BEFORE"
redirector = Redirect(sys.stdout, fh)
try:
os.system("ls -la")
finally:
redirector.close()
print "AFTER"
if __name__ == "__main__":
test()