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Use osutils.pumpfile so we don't have to buffer everything in ram

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bzrlib/diff.py
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from bzrlib.delta import compare_trees
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from bzrlib.errors import BzrError
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import bzrlib.errors as errors
 
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import bzrlib.osutils
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from bzrlib.patiencediff import unified_diff
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import bzrlib.patiencediff
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from bzrlib.symbol_versioning import *
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        pipe.stdin.close()
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        if not have_fileno:
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            to_file.write(pipe.stdout.read())
 
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            bzrlib.osutils.pumpfile(pipe.stdout, to_file)
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        rc = pipe.wait()
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        if rc != 0 and rc != 1: