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#!/usr/bin/env python

# Copyright (c) 2013 Intel Corporation
#
# This program is free software; you can redistribute it and/or modify
# it under the terms of the GNU General Public License version 2 as
# published by the Free Software Foundation.
#
# 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, write to the Free Software Foundation, Inc.,
# 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.

# DESCRIPTION
# This script runs tests defined in meta/lib/selftest/
# It's purpose is to automate the testing of different bitbake tools.
# To use it you just need to source your build environment setup script and
# add the meta-selftest layer to your BBLAYERS.
# Call the script as: "oe-selftest" to run all the tests in in meta/lib/selftest/
# Call the script as: "oe-selftest <module>.<Class>.<method>" to run just a single test
# E.g: "oe-selftest bboutput.BitbakeLayers" will run just the BitbakeLayers class from meta/lib/selftest/bboutput.py


import os
import sys
import unittest
import logging
import argparse

sys.path.insert(0, os.path.abspath(os.path.join(os.path.dirname(__file__), '..', 'meta/lib')))

import oeqa.selftest
import oeqa.utils.ftools as ftools
from oeqa.utils.commands import runCmd, get_bb_var, get_test_layer
from oeqa.selftest.base import oeSelfTest

def logger_create():
    log = logging.getLogger("selftest")
    log.setLevel(logging.DEBUG)

    fh = logging.FileHandler(filename='oe-selftest.log', mode='w')
    fh.setLevel(logging.DEBUG)

    ch = logging.StreamHandler(sys.stdout)
    ch.setLevel(logging.INFO)

    formatter = logging.Formatter('%(asctime)s - %(name)s - %(levelname)s - %(message)s')
    fh.setFormatter(formatter)
    ch.setFormatter(formatter)

    log.addHandler(fh)
    log.addHandler(ch)

    return log

log = logger_create()

def get_args_parser():
    description = "Script that runs unit tests agains bitbake and other Yocto related tools. The goal is to validate tools functionality and metadata integrity. Refer to https://wiki.yoctoproject.org/wiki/Oe-selftest for more information."
    parser = argparse.ArgumentParser(description=description)
    group = parser.add_mutually_exclusive_group(required=True)
    group.add_argument('--run-tests', required=False, action='store', nargs='*', dest="run_tests", default=None, help='Select what tests to run (modules, classes or test methods). Format should be: <module>.<class>.<test_method>')
    group.add_argument('--run-all-tests', required=False, action="store_true", dest="run_all_tests", default=False, help='Run all (unhidden) tests')
    group.add_argument('--list-modules', required=False, action="store_true", dest="list_modules", default=False, help='List all available test modules.')
    group.add_argument('--list-classes', required=False, action="store_true", dest="list_allclasses", default=False, help='List all available test classes.')
    return parser


def preflight_check():

    log.info("Checking that everything is in order before running the tests")

    if not os.environ.get("BUILDDIR"):
        log.error("BUILDDIR isn't set. Did you forget to source your build environment setup script?")
        return False

    builddir = os.environ.get("BUILDDIR")
    if os.getcwd() != builddir:
        log.info("Changing cwd to %s" % builddir)
        os.chdir(builddir)

    if not "meta-selftest" in get_bb_var("BBLAYERS"):
        log.error("You don't seem to have the meta-selftest layer in BBLAYERS")
        return False

    log.info("Running bitbake -p")
    runCmd("bitbake -p")

    return True

def add_include():
    builddir = os.environ.get("BUILDDIR")
    if "#include added by oe-selftest.py" \
        not in ftools.read_file(os.path.join(builddir, "conf/local.conf")):
            log.info("Adding: \"include selftest.inc\" in local.conf")
            ftools.append_file(os.path.join(builddir, "conf/local.conf"), \
                    "\n#include added by oe-selftest.py\ninclude selftest.inc")


def remove_include():
    builddir = os.environ.get("BUILDDIR")
    if builddir is None:
        return
    if "#include added by oe-selftest.py" \
        in ftools.read_file(os.path.join(builddir, "conf/local.conf")):
            log.info("Removing the include from local.conf")
            ftools.remove_from_file(os.path.join(builddir, "conf/local.conf"), \
                    "#include added by oe-selftest.py\ninclude selftest.inc")


def remove_inc_files():
    try:
        os.remove(os.path.join(os.environ.get("BUILDDIR"), "conf/selftest.inc"))
        for root, _, files in os.walk(get_test_layer()):
            for f in files:
                if f == 'test_recipe.inc':
                    os.remove(os.path.join(root, f))
    except (AttributeError, OSError,) as e:    # AttributeError may happen if BUILDDIR is not set
        pass

def get_tests(exclusive_modules=[], include_hidden=False):
    testslist = []
    for x in exclusive_modules:
        testslist.append('oeqa.selftest.' + x)
    if not testslist:
        testpath = os.path.abspath(os.path.dirname(oeqa.selftest.__file__))
        files = sorted([f for f in os.listdir(testpath) if f.endswith('.py') and not (f.startswith('_') and not include_hidden) and not f.startswith('__') and f != 'base.py'])
        for f in files:
            module = 'oeqa.selftest.' + f[:-3]
            testslist.append(module)

    return testslist

def main():
    parser = get_args_parser()
    args = parser.parse_args()

    if args.list_allclasses:
        args.list_modules = True

    if args.list_modules:
        log.info('Listing all available test modules:')
        testslist = get_tests(include_hidden=True)
        for test in testslist:
            module = test.split('.')[-1]
            info = ''
            if module.startswith('_'):
                info = ' (hidden)'
            print module + info
            if args.list_allclasses:
                try:
                    import importlib
                    modlib = importlib.import_module(test)
                    for v in vars(modlib):
                        t = vars(modlib)[v]
                        if isinstance(t, type(oeSelfTest)) and issubclass(t, oeSelfTest) and t!=oeSelfTest:
                            print " --", v
                            for method in dir(t):
                                if method.startswith("test_"):
                                    print " --  --", method

                except (AttributeError, ImportError) as e:
                    print e
                    pass


    if args.run_tests or args.run_all_tests:
        if not preflight_check():
            return 1

        testslist = get_tests(exclusive_modules=(args.run_tests or []), include_hidden=False)
        suite = unittest.TestSuite()
        loader = unittest.TestLoader()
        loader.sortTestMethodsUsing = None
        runner = unittest.TextTestRunner(verbosity=2, resultclass=StampedResult)
        # we need to do this here, otherwise just loading the tests
        # will take 2 minutes (bitbake -e calls)
        oeSelfTest.testlayer_path = get_test_layer()
        for test in testslist:
            log.info("Loading tests from: %s" % test)
            try:
                suite.addTests(loader.loadTestsFromName(test))
            except AttributeError as e:
                log.error("Failed to import %s" % test)
                log.error(e)
                return 1
        add_include()
        result = runner.run(suite)
        log.info("Finished")
        if result.wasSuccessful():
            return 0
        else:
            return 1

class StampedResult(unittest.TextTestResult):
    """
    Custom TestResult that prints the time when a test starts.  As oe-selftest
    can take a long time (ie a few hours) to run, timestamps help us understand
    what tests are taking a long time to execute.
    """
    def startTest(self, test):
        import time
        self.stream.write(time.strftime("%Y-%m-%d %H:%M:%S", time.localtime()) + " - ")
        super(StampedResult, self).startTest(test)

if __name__ == "__main__":
    try:
        ret = main()
    except Exception:
        ret = 1
        import traceback
        traceback.print_exc(5)
    finally:
        remove_include()
        remove_inc_files()
    sys.exit(ret)