74 lines
2.6 KiB
Python
74 lines
2.6 KiB
Python
# 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 re
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import string
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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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version = None
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try:
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version = sys.version_info[0:2]
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except AttributeError:
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pass # pre 2.0, no neat way to get the exact number
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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 not version or version < (2, 4) or version >= (3, 0):
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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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def extract_version(self, path):
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match = re.search(r'/python(\d+)\.(\d+)$', path)
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if match:
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return (int(match.group(1)), int(match.group(2)))
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else:
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return None
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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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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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possible_versions = []
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best_python = (0, 0), ''
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for python in pythons:
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version = self.extract_version(python)
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if version >= (2, 4):
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possible_versions.append((version, python))
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possible_versions.sort()
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if not possible_versions:
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raise ValueError('Python 2.x version 2.4 or better is required')
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# Return the lowest possible version so that we use 2.4 if available
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# rather than more recent versions.
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return possible_versions[0][1]
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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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