Add script for logrotate test

Add test for logrotate test
PR #9504 [rsyslog]Setting log file size to 16Mb

Author: echuawu

tests/syslog/test_logrotate.py

@@ -0,0 +1,215 @@
+import logging
+import pytest
+import allure
+
+from tests.common.plugins.loganalyzer.loganalyzer import DisableLogrotateCronContext
+from tests.common import config_reload
+
+logger = logging.getLogger(__name__)
+
+pytestmark = [
+    pytest.mark.topology("any"),
+    pytest.mark.disable_loganalyzer
+]
+
+LOG_FOLDER = '/var/log'
+ROTATE_THRESHOLD_LARGE = '16M'
+ROTATE_THRESHOLD_SMALL = '1024K'
+SMALL_VAR_LOG_PARTITION_SIZE = '100M'
+
+
+@pytest.fixture(scope='module', autouse=True)
+def disable_logrotate_cron_job(rand_selected_dut):
+    with DisableLogrotateCronContext(rand_selected_dut):
+        yield
+
+
+@pytest.fixture(scope='module', autouse=True)
+def backup_syslog(rand_selected_dut):
+    """
+    Back up current syslog file
+    :param rand_selected_dut: The fixture returns a randomly selected DUT
+    """
+    duthost = rand_selected_dut
+    logger.info('Backup syslog file to syslog_bk')
+    duthost.shell('sudo cp -f /var/log/syslog /var/log/syslog_bk')
+
+    yield
+
+    logger.info('Recover syslog file to syslog')
+    duthost.shell('sudo mv /var/log/syslog_bk /var/log/syslog')
+
+    logger.info('Remove temp file /var/log/syslog.1')
+    duthost.shell('sudo rm -f /var/log/syslog.1')
+
+    logger.info('Restart rsyslog service')
+    duthost.shell('sudo service rsyslog restart')
+
+
+@pytest.fixture(scope='function')
+def simulate_small_var_log_partition(rand_selected_dut, localhost):
+    """
+    Simulate a small var log partition
+    :param rand_selected_dut: The fixture returns a randomly selected DUT
+    """
+    duthost = rand_selected_dut
+    with allure.step('Create a small var log partition with size of {}'.format(SMALL_VAR_LOG_PARTITION_SIZE)):
+        logger.info('Create a small var log partition with size of {}'.format(SMALL_VAR_LOG_PARTITION_SIZE))
+        duthost.shell('sudo fallocate -l {} log-new-partition'.format(SMALL_VAR_LOG_PARTITION_SIZE))
+        duthost.shell('sudo losetup -P  /dev/loop2 log-new-partition')
+        duthost.shell('sudo mkfs.ext4 /dev/loop2')
+        duthost.shell('sudo mount /dev/loop2 /var/log')
+
+        config_reload(duthost, safe_reload=True)
+
+        logger.info('Start logrotate-config service')
+        duthost.shell('sudo service logrotate-config start')
+
+    yield
+
+    with allure.step('Recovery var log'):
+        logger.info('Umount and unload the small var log partition')
+        duthost.shell('sudo umount -l /dev/loop2')
+        duthost.shell('sudo losetup -d /dev/loop2')
+
+        logger.info('Remove the small var log partition')
+        duthost.shell('sudo rm -f log-new-partition')
+
+        config_reload(duthost, safe_reload=True)
+
+        logger.info('Restart logrotate-config service')
+        duthost.shell('sudo service logrotate-config restart')
+
+
+def get_var_log_size(duthost):
+    """
+    Check the size of /var/log folder
+    :param duthost: DUT host object
+    :return: size value
+    """
+    size = duthost.shell("sudo df -k /var/log | sed -n 2p | awk '{ print $2 }'")['stdout']
+    return int(size)
+
+
+def get_syslog_file_count(duthost):
+    """
+    Check the rotated syslog file number
+    :param duthost: DUT host object
+    :return: file number value
+    """
+    logger.info('Check rotated syslog file number')
+    num = duthost.shell('sudo ls -l /var/log | grep -Ec "syslog\\.[0-9]{1,4}[\\.gz]{0,1}"')['stdout']
+    logger.debug('There are {} rotated syslog files'.format(num))
+    return int(num)
+
+
+def create_temp_syslog_file(duthost, size):
+    """
+    Create a temp syslog file with specific size and
+    :param duthost: DUT host object
+    :param size: file size with unit, such as 16M or 1024K, the unit could be M or K
+    """
+    logger.info('Create a temp syslog file as {}'.format(size))
+    duthost.shell('sudo fallocate -l {} /var/log/syslog'.format(size))
+
+
+def run_logrotate(duthost, force=False):
+    """
+    Run logrotate command
+    :param duthost: DUT host object
+    :param force: force logrotate run immediately even the syslog size is very small, value is True or False
+    """
+    if force:
+        logger.debug('Make sure there is no big /var/log/syslog exist by forcing execute logrotate')
+        cmd = 'sudo /usr/sbin/logrotate -f /etc/logrotate.conf > /dev/null 2>&1'
+    else:
+        cmd = 'sudo /usr/sbin/logrotate /etc/logrotate.conf > /dev/null 2>&1'
+    logger.info('Run logrotate command: {}'.format(cmd))
+    duthost.shell(cmd)
+
+
+def multiply_with_unit(logrotate_threshold, num):
+    """
+    Multiply logrotate_threshold with number, and return the value
+    Such as '1024K' * 0.5, return '512K'
+    :param logrotate_threshold: string type threshold value with unit, such as '1024K'
+    :param num: the number need to multiply with
+    :return: value with unit, such as '512K'
+    """
+    return str(int(logrotate_threshold[:-1]) * num) + logrotate_threshold[-1]
+
+
+def validate_logrotate_function(duthost, logrotate_threshold):
+    """
+    Validate logrotate function
+    :param duthost: DUT host object
+    :param logrotate_threshold: logrotate threshold, such as 16M or 1024K
+    """
+    with allure.step('Run logrotate with force option to prepare clean syslog environment'):
+        run_logrotate(duthost, force=True)
+
+    with allure.step('There should be no logrotate process when rsyslog size is smaller than threshold {}'.format(
+            logrotate_threshold)):
+        syslog_number_origin = get_syslog_file_count(duthost)
+        logger.info('There are {} syslog gz files'.format(syslog_number_origin))
+        create_temp_syslog_file(duthost, multiply_with_unit(logrotate_threshold, 0.9))
+        run_logrotate(duthost)
+        syslog_number_no_rotate = get_syslog_file_count(duthost)
+        logger.info('There are {} syslog gz files after running logrotate'.format(syslog_number_no_rotate))
+        assert syslog_number_origin == syslog_number_no_rotate, \
+            'Unexpected logrotate happens, there should be no logrotate executed'
+
+    with allure.step('There will be logrotate process when rsyslog size is larger than threshold {}'.format(
+            logrotate_threshold)):
+        create_temp_syslog_file(duthost, multiply_with_unit(logrotate_threshold, 1.1))
+        run_logrotate(duthost)
+        syslog_number_with_rotate = get_syslog_file_count(duthost)
+        logger.info('There are {} syslog gz files after running logrotate'.format(syslog_number_with_rotate))
+        assert syslog_number_origin + 1 == syslog_number_with_rotate, \
+            'No logrotate happens, there should be one time logrotate executed'
+
+
+@pytest.mark.disable_loganalyzer
+def test_logrotate_normal_size(rand_selected_dut):
+    """
+    Test case of logrotate under normal size /var/log, test steps are listed
+
+    Stop logrotate cron job, make sure no logrotate executes during this test
+    Back up current syslog file, name the backup file as 'syslog_bk'
+    Check current /var/log is lower than 200MB, else skip this test
+    Check current syslog.x file number and save it
+    Create a temp file with size of rotate_size * 90% , and rename it as 'syslog', run logrotate command
+    There would be no logrotate happens - by checking the 'syslog.x' file number not increased
+    Create a temp file with size of rotate_size * 110%, and rename it as 'syslog', run logrotate command
+    There would be logrotate happens - by checking the 'syslog.x' file number increased by 1
+    Remove the temp 'syslog' file and recover the 'syslog_bk' to 'syslog'
+
+    :param rand_selected_dut: The fixture returns a randomly selected DUT
+    """
+    duthost = rand_selected_dut
+    with allure.step('Check whether the DUT is a small flash DUT'):
+        if get_var_log_size(duthost) < 200 * 1024:
+            pytest.skip('{} size is lower than 200MB, skip this test'.format(LOG_FOLDER))
+    validate_logrotate_function(duthost, ROTATE_THRESHOLD_LARGE)
+
+
+@pytest.mark.disable_loganalyzer
+def test_logrotate_small_size(rand_selected_dut, simulate_small_var_log_partition):
+    """
+    Test case of logrotate under a simulated small size /var/log, test steps are listed
+
+    Create a temp device which is around 100MB large, then mount it to /var/log
+    Execute config reload to active the mount
+    Stop logrotate cron job, make sure no logrotate executes during this test
+    Check current syslog.x file number and save it
+    Create a temp file with size of rotate_size * 90%, and rename it as 'syslog', run logrotate command
+    There would be no logrotate happens - by checking the 'syslog.x' file number not increased
+    Create a temp file with size of rotate_size * 110%, and rename it as 'syslog', run logrotate command
+    There would be logrotate happens - by checking the 'syslog.x' file number increased by 1
+    Reboot the dut to recover original /var/log mount
+
+    :param rand_selected_dut: The fixture returns a randomly selected DUT
+    :param simulate_small_var_log_partition: The fixture simulates a small var log partition
+    """
+    duthost = rand_selected_dut
+    validate_logrotate_function(duthost, ROTATE_THRESHOLD_SMALL)