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patch.py

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import sys

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from subprocess import Popen, PIPE

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def patch(branch, filename, strip):

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    """Apply a patch to a branch, using patch(1)."""

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    if filename is None:

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        my_file = sys.stdin

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    else:

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        my_file = file(filename, 'rb')

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    cmd = ['patch', '--directory', branch.base, '--strip', str(strip)]

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    child_proc = Popen(cmd, stdin=PIPE)

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    for line in my_file:

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        child_proc.stdin.write(line)

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    child_proc.stdin.close()

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    return child_proc.wait()

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