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+# -*- coding: utf-8 -*-
+# GNU Guix --- Functional package management for GNU
+# Copyright © 2021 Lars-Dominik Braun <lars@6xq.net>
+#
+# This file is part of GNU Guix.
+#
+# GNU Guix 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.
+#
+# GNU Guix 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 GNU Guix. If not, see <http://www.gnu.org/licenses/>.
+
+from __future__ import print_function # Python 2 support.
+import importlib
+import pkg_resources
+import sys
+import traceback
+
+try:
+ from importlib.machinery import PathFinder
+except ImportError:
+ PathFinder = None
+
+ret = 0
+
+# Only check site-packages installed by this package, but not dependencies
+# (which pkg_resources.working_set would include). Path supplied via argv.
+ws = pkg_resources.find_distributions(sys.argv[1])
+
+for dist in ws:
+ print('validating', repr(dist.project_name), dist.location)
+ try:
+ print('...checking requirements: ', end='')
+ req = str(dist.as_requirement())
+ # dist.activate() is not enough to actually check requirements, we
+ # have to .require() it.
+ pkg_resources.require(req)
+ print('OK')
+ except Exception as e:
+ print('ERROR:', req, e)
+ ret = 1
+ continue
+
+ # Try to load top level modules. This should not have any side-effects.
+ try:
+ metalines = dist.get_metadata_lines('top_level.txt')
+ except (KeyError, EnvironmentError):
+ # distutils (i.e. #:use-setuptools? #f) will not install any metadata.
+ # This file is also missing for packages built using a PEP 517 builder
+ # such as poetry.
+ print('WARNING: cannot determine top-level modules')
+ continue
+ for name in metalines:
+ # Only available on Python 3.
+ if PathFinder and PathFinder.find_spec(name) is None:
+ # Ignore unavailable modules, often C modules, which were not
+ # installed at the top-level. Cannot use ModuleNotFoundError,
+ # because it is raised by failed imports too.
+ continue
+ try:
+ print('...trying to load module', name, end=': ')
+ importlib.import_module(name)
+ print('OK')
+ except Exception:
+ print('ERROR:')
+ traceback.print_exc(file=sys.stdout)
+ ret = 1
+
+ # Try to load entry points of console scripts too, making sure they
+ # work. They should be removed if they don't. Other groups may not be
+ # safe, as they can depend on optional packages.
+ for group, v in dist.get_entry_map().items():
+ if group not in {'console_scripts', 'gui_scripts'}:
+ continue
+ for name, ep in v.items():
+ try:
+ print('...trying to load endpoint', group, name, end=': ')
+ ep.load()
+ print('OK')
+ except Exception:
+ print('ERROR:')
+ traceback.print_exc(file=sys.stdout)
+ ret = 1
+
+sys.exit(ret)