Current File : //proc/thread-self/root/lib/python2.7/site-packages/salt/utils/pkg/__init__.py
# -*- coding: utf-8 -*-
'''
Common functions for managing package refreshes during states
'''
# Import python libs
from __future__ import absolute_import, print_function, unicode_literals
import errno
import logging
import os
import re
# Import Salt libs
import salt.utils.data
import salt.utils.files
import salt.utils.versions
log = logging.getLogger(__name__)
def rtag(opts):
'''
Return the rtag file location. This file is used to ensure that we don't
refresh more than once (unless explicitly configured to do so).
'''
return os.path.join(opts['cachedir'], 'pkg_refresh')
def clear_rtag(opts):
'''
Remove the rtag file
'''
try:
os.remove(rtag(opts))
except OSError as exc:
if exc.errno != errno.ENOENT:
# Using __str__() here to get the fully-formatted error message
# (error number, error message, path)
log.warning('Encountered error removing rtag: %s', exc.__str__())
def write_rtag(opts):
'''
Write the rtag file
'''
rtag_file = rtag(opts)
if not os.path.exists(rtag_file):
try:
with salt.utils.files.fopen(rtag_file, 'w+'):
pass
except OSError as exc:
log.warning('Encountered error writing rtag: %s', exc.__str__())
def check_refresh(opts, refresh=None):
'''
Check whether or not a refresh is necessary
Returns:
- True if refresh evaluates as True
- False if refresh is False
- A boolean if refresh is not False and the rtag file exists
'''
return bool(
salt.utils.data.is_true(refresh) or
(os.path.isfile(rtag(opts)) and refresh is not False)
)
def split_comparison(version):
match = re.match(r'^(<=>|!=|>=|<=|>>|<<|<>|>|<|=)?\s?([^<>=]+)$', version)
if match:
comparison = match.group(1) or ''
version = match.group(2)
else:
comparison = ''
return comparison, version
def match_version(desired, available, cmp_func=None, ignore_epoch=False):
'''
Returns the first version of the list of available versions which matches
the desired version comparison expression, or None if no match is found.
'''
oper, version = split_comparison(desired)
if not oper:
oper = '=='
for candidate in available:
if salt.utils.versions.compare(ver1=candidate,
oper=oper,
ver2=version,
cmp_func=cmp_func,
ignore_epoch=ignore_epoch):
return candidate
return None
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