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@ -4,7 +4,6 @@ import contextlib
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import functools
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import io
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import logging
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import shutil
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import struct
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log = logging.getLogger(__name__)
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@ -219,7 +218,13 @@ def memoize(func):
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@memoize
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def which(cmd):
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"""Return full path to specified command, or raise OSError if missing."""
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full_path = shutil.which(cmd)
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try:
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# For Python 3
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from shutil import which as _which
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except ImportError:
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# For Python 2
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from backports.shutil_which import which as _which # pylint: disable=relative-import
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full_path = _which(cmd)
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if full_path is None:
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raise OSError('Cannot find {!r} in $PATH'.format(cmd))
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log.debug('which %r => %r', cmd, full_path)
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