143 lines
4.2 KiB
Python
143 lines
4.2 KiB
Python
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# Copyright 2018 Red Hat
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#
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# Licensed under the Apache License, Version 2.0 (the "License"); you may
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# not use this file except in compliance with the License. You may obtain
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# a copy of the License at
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#
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# http://www.apache.org/licenses/LICENSE-2.0
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#
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# Unless required by applicable law or agreed to in writing, software
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# distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
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# WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
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# License for the specific language governing permissions and limitations
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# under the License.
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from __future__ import absolute_import
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import argparse
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import json
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import logging
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import os
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import subprocess
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import sys
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LOG = logging.getLogger(__name__)
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GET_PYTHON_VERSION_SCRIPT = """
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import sys
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version = '.'.join(str(i) for i in sys.version_info[:3])
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print(version)
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"""
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def main():
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parser = argparse.ArgumentParser()
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parser.add_argument('--quiet', '-q',
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action="store_true",
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help="mute logging messages from STDERR")
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parser.add_argument('--base', '-b',
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action="store_true",
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help="print Python base prefix")
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args = parser.parse_args()
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setup_logging(quiet=args.quiet)
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version = get_python_version()
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executables = [
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info['executable']
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for info in iter_python_executables_info(match_version=version,
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base=args.base)]
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info = {'version': version, 'executables': executables}
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output = json.dumps(info, indent=4, sort_keys=True)
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print(output)
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def setup_logging(quiet=False):
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if quiet:
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level = logging.ERROR
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else:
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level = logging.DEBUG
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logging.basicConfig(
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level=level,
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stream=sys.stderr,
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format='%(name)-s: %(levelname)-7s %(asctime)-15s | %(message)s')
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def get_python_version():
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return '.'.join(str(i) for i in sys.version_info[:3])
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def iter_python_executables_info(match_version=None, base=None):
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last_error = None
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for executable in iter_python_executables(base=base):
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command = subprocess.list2cmdline(
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[executable, '-c', GET_PYTHON_VERSION_SCRIPT])
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try:
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version = execute(command).splitlines()[0]
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except subprocess.CalledProcessError:
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LOG.exception('Unable to get version from script')
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else:
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if not match_version or match_version == version:
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yield {'executable': executable, 'version': version}
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else:
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if last_error:
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raise last_error
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def iter_python_executables(base=None):
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iterated = set()
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for executable in _iter_python_executables(base=base):
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# Iterate every executable only once
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if executable not in iterated:
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iterated.add(executable)
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yield executable
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def _iter_python_executables(base):
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if base:
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base_prefix = getattr(sys, 'base_prefix', None)
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if base_prefix:
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for executable in iter_prefix_executables(base_prefix):
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yield executable
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for executable in iter_prefix_executables(sys.prefix):
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yield executable
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yield sys.executable
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def iter_prefix_executables(prefix):
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if os.path.isdir(prefix):
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for python_name in iter_versioned_names():
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executable = os.path.join(prefix, 'bin', python_name)
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if os.path.isfile(executable):
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yield executable
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def iter_versioned_names(unversioned=None):
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unversioned = unversioned or 'python'
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short_versioned = unversioned + str(sys.version_info[0])
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long_versioned = '.'.join([short_versioned, str(sys.version_info[1])])
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yield long_versioned
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yield short_versioned
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yield unversioned
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def execute(command, *args, **kwargs):
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if args or kwargs:
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command = command.format(*args, **kwargs)
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LOG.debug('%s', command)
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env = kwargs.get('env', None)
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return subprocess.check_output(command, shell=True,
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universal_newlines=True,
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env=env)
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def name_from_path(path):
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return os.path.splitext(os.path.basename(path))[0]
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if __name__ == '__main__':
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LOG = logging.getLogger(name_from_path(__file__))
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main()
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