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53 lines
2.0 KiB
53 lines
2.0 KiB
# This file must use Python 1.5 syntax.
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import glob
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import os
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import sys
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class check_python_version:
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def __init__(self):
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# In order to ease the migration to Python3, disable the restart logic
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# when AUTOTEST_NO_RESTART is set. This makes it possible to run
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# autotest locally as Python3 before any other environment is switched
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# to Python3.
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if os.getenv("AUTOTEST_NO_RESTART"):
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return
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# The change to prefer 2.4 really messes up any systems which have both
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# the new and old version of Python, but where the newer is default.
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# This is because packages, libraries, etc are all installed into the
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# new one by default. Some things (like running under mod_python) just
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# plain don't handle python restarting properly. I know that I do some
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# development under ipython and whenever I run (or do anything that
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# runs) 'import common' it restarts my shell. Overall, the change was
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# fairly annoying for me (and I can't get around having 2.4 and 2.5
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# installed with 2.5 being default).
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if sys.version_info.major >= 3:
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try:
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# We can't restart when running under mod_python.
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from mod_python import apache
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except ImportError:
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self.restart()
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PYTHON_BIN_GLOB_STRINGS = ['/usr/bin/python2*', '/usr/local/bin/python2*']
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def find_desired_python(self):
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"""Returns the path of the desired python interpreter."""
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# CrOS only ever has Python 2.7 available, so pick whatever matches.
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pythons = []
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for glob_str in self.PYTHON_BIN_GLOB_STRINGS:
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pythons.extend(glob.glob(glob_str))
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return pythons[0]
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def restart(self):
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python = self.find_desired_python()
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sys.stderr.write('NOTE: %s switching to %s\n' %
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(os.path.basename(sys.argv[0]), python))
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sys.argv.insert(0, '-u')
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sys.argv.insert(0, python)
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os.execv(sys.argv[0], sys.argv)
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