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#!/usr/bin/env python
# -*- coding: utf-8 -*-
#
# smoke_zephyr/requirements.py
#
# Redistribution and use in source and binary forms, with or without
# modification, are permitted provided that the following conditions are
# met:
#
# * Redistributions of source code must retain the above copyright
# notice, this list of conditions and the following disclaimer.
# * Redistributions in binary form must reproduce the above
# copyright notice, this list of conditions and the following disclaimer
# in the documentation and/or other materials provided with the
# distribution.
# * Neither the name of the project nor the names of its
# contributors may be used to endorse or promote products derived from
# this software without specific prior written permission.
#
# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
# "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
# LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
# A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
# OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
# SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
# LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
# DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
# THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
# (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
# OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
#
import distutils.version # pylint: disable=E0611
import re
import pkg_resources
def check_requirements(requirements, ignore=None):
"""
Parse requirements for package information to determine if all requirements
are met. The *requirements* argument can be a string to a requirements file,
a file like object to be read, or a list of strings representing the package
requirements.
:param requirements: The file to parse.
:type requirements: file obj, list, str, tuple
:param ignore: A sequence of packages to ignore.
:type ignore: list, tuple
:return: A list of missing or incompatible packages.
:rtype: list
"""
ignore = (ignore or [])
not_satisfied = []
working_set = pkg_resources.working_set
installed_packages = dict((p.project_name, p) for p in working_set) # pylint: disable=E1133
if isinstance(requirements, str):
with open(requirements, 'r') as file_h:
requirements = file_h.readlines()
elif hasattr(requirements, 'readlines'):
requirements = requirements.readlines()
elif not isinstance(requirements, (list, tuple)):
raise TypeError('invalid type for argument requirements')
for req_line in requirements:
req_line = req_line.strip()
parts = re.match(r'^([\w\-]+)(([<>=]=)(\d+(\.\d+)*))?$', req_line)
if not parts:
raise ValueError("requirement '{0}' is in an invalid format".format(req_line))
req_pkg = parts.group(1)
if req_pkg in ignore:
continue
if req_pkg not in installed_packages:
try:
find_result = working_set.find(pkg_resources.Requirement.parse(req_line))
except pkg_resources.ResolutionError:
find_result = False
if not find_result:
not_satisfied.append(req_pkg)
continue
if not parts.group(2):
continue
req_version = distutils.version.StrictVersion(parts.group(4))
installed_pkg = installed_packages[req_pkg]
installed_version = re.match(r'^((\d+\.)*\d+)', installed_pkg.version)
if not installed_version:
not_satisfied.append(req_pkg)
continue
installed_version = distutils.version.StrictVersion(installed_version.group(0))
if parts.group(3) == '==' and installed_version != req_version:
not_satisfied.append(req_pkg)
elif parts.group(3) == '>=' and installed_version < req_version:
not_satisfied.append(req_pkg)
elif parts.group(3) == '<=' and installed_version > req_version:
not_satisfied.append(req_pkg)
return not_satisfied
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