blob: 6ff91dd41ef1bc635d196c80762a4c062185c3e2 [file] [log] [blame]
# This file must use Python 1.5 syntax.
import glob
import os
import re
import string
import sys
class check_python_version:
def __init__(self):
version = None
version = sys.version_info[0:2]
except AttributeError:
pass # pre 2.0, no neat way to get the exact number
# The change to prefer 2.4 really messes up any systems which have both
# the new and old version of Python, but where the newer is default.
# This is because packages, libraries, etc are all installed into the
# new one by default. Some things (like running under mod_python) just
# plain don't handle python restarting properly. I know that I do some
# development under ipython and whenever I run (or do anything that
# runs) 'import common' it restarts my shell. Overall, the change was
# fairly annoying for me (and I can't get around having 2.4 and 2.5
# installed with 2.5 being default).
if not version or version < (2, 4) or version >= (3, 0):
# We can't restart when running under mod_python.
from mod_python import apache
except ImportError:
def extract_version(self, path):
match ='/python(\d+)\.(\d+)$', path)
if match:
return (int(, int(
return None
PYTHON_BIN_GLOB_STRINGS = ['/usr/bin/python2*', '/usr/local/bin/python2*']
def find_desired_python(self):
"""Returns the path of the desired python interpreter."""
pythons = []
for glob_str in self.PYTHON_BIN_GLOB_STRINGS:
possible_versions = []
best_python = (0, 0), ''
for python in pythons:
version = self.extract_version(python)
if version >= (2, 4):
possible_versions.append((version, python))
if not possible_versions:
raise ValueError('Python 2.x version 2.4 or better is required')
# Return the lowest possible version so that we use 2.4 if available
# rather than more recent versions.
return possible_versions[0][1]
def restart(self):
python = self.find_desired_python()
sys.stderr.write('NOTE: %s switching to %s\n' %
(os.path.basename(sys.argv[0]), python))
sys.argv.insert(0, '-u')
sys.argv.insert(0, python)
os.execv(sys.argv[0], sys.argv)