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(gz) Propogate site.USER_BASE in selftest run_bzr_subprocess to keep the
 same sys.path (Martin Packman)

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bzrlib/tests/__init__.py
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import random
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import re
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import shlex
 
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import site
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import stat
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import subprocess
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import sys
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        if env_changes is None:
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            env_changes = {}
 
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        # Because $HOME is set to a tempdir for the context of a test, modules
 
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        # installed in the user dir will not be found unless $PYTHONUSERBASE
 
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        # gets set to the computed directory of this parent process.
 
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        if site.USER_BASE is not None:
 
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            env_changes["PYTHONUSERBASE"] = site.USER_BASE
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        old_env = {}
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        def cleanup_environment():