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#!/usr/bin/env python3
# SPDX-License-Identifier: LGPL-2.1-or-later
# pylint: disable=line-too-long,too-many-lines,too-many-branches,too-many-statements,too-many-arguments
# pylint: disable=too-many-public-methods,too-many-boolean-expressions,invalid-name,no-self-use
# pylint: disable=missing-function-docstring,missing-class-docstring,missing-module-docstring
#
# Copyright © 2017 Michal Sekletar <msekleta@redhat.com>
# ATTENTION: This uses the *installed* systemd, not the one from the built
# source tree.
import os
import subprocess
import sys
import time
import unittest
import uuid
from enum import Enum
class InstallChange(Enum):
NO_CHANGE = 0
LINES_SWAPPED = 1
COMMAND_ADDED_BEFORE = 2
COMMAND_ADDED_AFTER = 3
COMMAND_INTERLEAVED = 4
REMOVAL = 5
class ExecutionResumeTest(unittest.TestCase):
def setUp(self):
self.unit = 'test-issue-518.service'
self.unitfile_path = f'/run/systemd/system/{self.unit}'
self.output_file = f"/tmp/test-issue-518-{uuid.uuid4()}"
self.unit_files = {}
unit_file_content = f'''
[Service]
Type=oneshot
ExecStart=/bin/sleep 3
ExecStart=/bin/bash -c "echo foo >>{self.output_file}"
'''
self.unit_files[InstallChange.NO_CHANGE] = unit_file_content
unit_file_content = f'''
[Service]
Type=oneshot
ExecStart=/bin/bash -c "echo foo >>{self.output_file}"
ExecStart=/bin/sleep 3
'''
self.unit_files[InstallChange.LINES_SWAPPED] = unit_file_content
unit_file_content = f'''
[Service]
Type=oneshot
ExecStart=/bin/bash -c "echo bar >>{self.output_file}"
ExecStart=/bin/sleep 3
ExecStart=/bin/bash -c "echo foo >>{self.output_file}"
'''
self.unit_files[InstallChange.COMMAND_ADDED_BEFORE] = unit_file_content
unit_file_content = f'''
[Service]
Type=oneshot
ExecStart=/bin/sleep 3
ExecStart=/bin/bash -c "echo foo >>{self.output_file}"
ExecStart=/bin/bash -c "echo bar >>{self.output_file}"
'''
self.unit_files[InstallChange.COMMAND_ADDED_AFTER] = unit_file_content
unit_file_content = f'''
[Service]
Type=oneshot
ExecStart=/bin/bash -c "echo baz >>{self.output_file}"
ExecStart=/bin/sleep 3
ExecStart=/bin/bash -c "echo foo >>{self.output_file}"
ExecStart=/bin/bash -c "echo bar >>{self.output_file}"
'''
self.unit_files[InstallChange.COMMAND_INTERLEAVED] = unit_file_content
unit_file_content = f'''
[Service]
Type=oneshot
ExecStart=/bin/bash -c "echo bar >>{self.output_file}"
ExecStart=/bin/bash -c "echo baz >>{self.output_file}"
'''
self.unit_files[InstallChange.REMOVAL] = unit_file_content
def reload(self):
subprocess.check_call(['systemctl', 'daemon-reload'])
def write_unit_file(self, unit_file_change):
if not isinstance(unit_file_change, InstallChange):
raise ValueError('Unknown unit file change')
content = self.unit_files[unit_file_change]
with open(self.unitfile_path, 'w', encoding='utf-8') as f:
f.write(content)
self.reload()
def check_output(self, expected_output):
for _ in range(15):
# Wait until the unit finishes so we don't check an incomplete log
if subprocess.call(['systemctl', '-q', 'is-active', self.unit]) == 0:
continue
os.sync()
try:
with open(self.output_file, 'r', encoding='utf-8') as log:
output = log.read()
self.assertEqual(output, expected_output)
return
except IOError:
pass
time.sleep(1)
self.fail(f'Timed out while waiting for the output file {self.output_file} to appear')
def setup_unit(self):
self.write_unit_file(InstallChange.NO_CHANGE)
subprocess.check_call(['systemctl', '--job-mode=replace', '--no-block', 'start', self.unit])
time.sleep(1)
def test_no_change(self):
expected_output = 'foo\n'
self.setup_unit()
self.reload()
self.check_output(expected_output)
def test_swapped(self):
self.setup_unit()
self.write_unit_file(InstallChange.LINES_SWAPPED)
self.reload()
self.assertTrue(not os.path.exists(self.output_file))
def test_added_before(self):
expected_output = 'foo\n'
self.setup_unit()
self.write_unit_file(InstallChange.COMMAND_ADDED_BEFORE)
self.reload()
self.check_output(expected_output)
def test_added_after(self):
expected_output = 'foo\nbar\n'
self.setup_unit()
self.write_unit_file(InstallChange.COMMAND_ADDED_AFTER)
self.reload()
self.check_output(expected_output)
def test_interleaved(self):
expected_output = 'foo\nbar\n'
self.setup_unit()
self.write_unit_file(InstallChange.COMMAND_INTERLEAVED)
self.reload()
self.check_output(expected_output)
def test_removal(self):
self.setup_unit()
self.write_unit_file(InstallChange.REMOVAL)
self.reload()
self.assertTrue(not os.path.exists(self.output_file))
def test_issue_6533(self):
unit = "test-issue-6533.service"
unitfile_path = f"/run/systemd/system/{unit}"
content = '''
[Service]
ExecStart=/bin/sleep 5
'''
with open(unitfile_path, 'w', encoding='utf-8') as f:
f.write(content)
self.reload()
subprocess.check_call(['systemctl', '--job-mode=replace', '--no-block', 'start', unit])
time.sleep(2)
content = '''
[Service]
ExecStart=/bin/sleep 5
ExecStart=/bin/true
'''
with open(unitfile_path, 'w', encoding='utf-8') as f:
f.write(content)
self.reload()
time.sleep(5)
self.assertNotEqual(subprocess.call("journalctl -b _PID=1 | grep -q 'Freezing execution'", shell=True), 0)
def tearDown(self):
for f in [self.output_file, self.unitfile_path]:
try:
os.remove(f)
except OSError:
# ignore error if log file doesn't exist
pass
self.reload()
if __name__ == '__main__':
unittest.main(testRunner=unittest.TextTestRunner(stream=sys.stdout, verbosity=3))
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