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| -rw-r--r-- | src/leap/util/requirement_checker.py | 101 |
1 files changed, 101 insertions, 0 deletions
diff --git a/src/leap/util/requirement_checker.py b/src/leap/util/requirement_checker.py new file mode 100644 index 00000000..3538f122 --- /dev/null +++ b/src/leap/util/requirement_checker.py @@ -0,0 +1,101 @@ +# -*- coding: utf-8 -*- +# requirement_checker.py +# Copyright (C) 2013 LEAP +# +# This program is free software: you can redistribute it and/or modify +# it under the terms of the GNU General Public License as published by +# the Free Software Foundation, either version 3 of the License, or +# (at your option) any later version. +# +# This program is distributed in the hope that it will be useful, +# but WITHOUT ANY WARRANTY; without even the implied warranty of +# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the +# GNU General Public License for more details. +# +# You should have received a copy of the GNU General Public License +# along with this program. If not, see <http://www.gnu.org/licenses/>. + +""" +Utility to check the needed requirements. +""" + +import os +import logging + +from pkg_resources import (DistributionNotFound, + get_distribution, + Requirement, + resource_stream, + VersionConflict) + +logger = logging.getLogger(__name__) + + +def get_requirements(): + """ + This function returns a list with requirements. + It checks either if its running from the source or if its installed. + + :returns: a list with packages names, required for the app. + :return type: list of str. + """ + develop = True + requirements = [] + + try: + # if we are running from the source + from pkg import util + requirements = util.parse_requirements() + except ImportError: + develop = False + + # if we are running from the package + if not develop: + requires_file_name = os.path.join('leap', 'util', 'reqs.txt') + dist_name = Requirement.parse('leap-client') + + try: + with resource_stream(dist_name, requires_file_name) as stream: + requirements = [line.strip() for line in stream] + except Exception, e: + logger.error("Requirements file not found. %e", (e, )) + + return requirements + + +def check_requirements(): + """ + This function check the dependencies declared in the + requirement(s) file(s) and logs the results. + """ + logger.debug("Checking requirements...") + requirements = get_requirements() + + for package in requirements: + try: + get_distribution(package) + except VersionConflict: + required_package = Requirement.parse(package) + required_version = required_package.specs[0] + required_name = required_package.key + + installed_package = get_distribution(required_name) + installed_version = installed_package.version + installed_location = installed_package.location + + msg = "Error: version not satisfied. " + msg += "Expected %s, installed %s (path: %s)." % ( + required_version, installed_version, installed_location) + + result = "%s ... %s" % (package, msg) + logger.error(result) + except DistributionNotFound: + msg = "Error: package not found!" + result = "%s ... %s" % (package, msg) + logger.error(result) + else: + msg = "OK" + result = "%s ... %s" % (package, msg) + logger.debug(result) + + logger.debug('Done') |