# Licensed under the Apache License, Version 2.0 (the "License"); you may
# not use this file except in compliance with the License. You may obtain
# a copy of the License at
#
#      http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
# WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
# License for the specific language governing permissions and limitations
# under the License.

import fixtures
import logging
import subprocess
import sys
import tempfile
import testtools
import time
import os

from zuul.driver import bubblewrap
from zuul.executor.server import SshAgent
from tests.base import iterate_timeout
from unittest import skipIf


class TestBubblewrap(testtools.TestCase):
    def setUp(self):
        super(TestBubblewrap, self).setUp()
        self.log_fixture = self.useFixture(
            fixtures.FakeLogger(level=logging.DEBUG))
        self.useFixture(fixtures.NestedTempfile())

    def test_bubblewrap_wraps(self):
        bwrap = bubblewrap.BubblewrapDriver()
        context = bwrap.getExecutionContext()
        work_dir = tempfile.mkdtemp()
        ssh_agent = SshAgent()
        self.addCleanup(ssh_agent.stop)
        ssh_agent.start()
        po = context.getPopen(work_dir=work_dir,
                              ssh_auth_sock=ssh_agent.env['SSH_AUTH_SOCK'])
        self.assertTrue(po.fds[0] > 2)
        self.assertTrue(po.fds[1] > 2)
        self.assertTrue(work_dir in po.command)
        # Now run /usr/bin/id to verify passwd/group entries made it in
        true_proc = po(['/usr/bin/id'], stdout=subprocess.PIPE,
                       stderr=subprocess.PIPE)
        (output, errs) = true_proc.communicate()
        # Make sure it printed things on stdout
        self.assertTrue(len(output.strip()))
        # And that it did not print things on stderr
        self.assertEqual(0, len(errs.strip()))
        # Make sure the _r's are closed
        self.assertEqual([], po.fds)

    @skipIf(sys.platform == 'darwin', 'Not supported on MacOS')
    def test_bubblewrap_leak(self):
        bwrap = bubblewrap.BubblewrapDriver()
        context = bwrap.getExecutionContext()
        work_dir = tempfile.mkdtemp()
        ansible_dir = tempfile.mkdtemp()
        ssh_agent = SshAgent()
        self.addCleanup(ssh_agent.stop)
        ssh_agent.start()
        po = context.getPopen(work_dir=work_dir,
                              ansible_dir=ansible_dir,
                              ssh_auth_sock=ssh_agent.env['SSH_AUTH_SOCK'])
        leak_time = 60
        # Use hexadecimal notation to avoid false-positive
        true_proc = po(['bash', '-c', 'sleep 0x%X & disown' % leak_time])
        self.assertEqual(0, true_proc.wait())
        cmdline = "sleep\x000x%X\x00" % leak_time
        for x in iterate_timeout(30, "process to exit"):
            try:
                sleep_proc = []
                for pid in os.listdir("/proc"):
                    if os.path.isfile("/proc/%s/cmdline" % pid):
                        with open("/proc/%s/cmdline" % pid) as f:
                            if f.read() == cmdline:
                                sleep_proc.append(pid)

                if not sleep_proc:
                    break
            except FileNotFoundError:
                pass
            except ProcessLookupError:
                pass
            time.sleep(1)