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vyatta-update-crontab.py
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vyatta-update-crontab.py
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#!/usr/bin/env python3
#
#
# Maintainer: Daniil Baturin <daniil@baturin.org>
#
# Copyright (C) 2013 SO3Group
#
# 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, see <http://www.gnu.org/licenses/>.
#
#
#!/usr/bin/env python3
import io
import re
import sys
sys.path.append("/usr/lib/python3/dist-packages/vyos/")
from config import VyOSError, Config
class CronTask(Config):
def __init__(self, task):
self.task = task
self.minutes = "*"
self.hours = "*"
self.days = "*"
self.user = "root"
self.executable = None
self.arguments = ""
self.interval = None
self.crontab_spec = None
self._cli_shell_api = "/bin/cli-shell-api"
# Unused now
self.months = "*"
self.days_of_week = "*"
super(CronTask, self).set_level("system task-scheduler task")
try:
self.user = super(CronTask, self).return_value(" ".join([self.task, "user"]))
except VyOSError:
pass
try:
byte_executable = super(CronTask, self).return_value(" ".join([self.task, "executable path"]))
self.executable = byte_executable.decode("utf-8")
except VyOSError:
raise VyOSError (task + "must define executable")
try:
byte_arguments = super(CronTask, self).return_value(" ".join([self.task, "executable arguments"]))
self.executable = byte_arguments.decode("utf-8")
except VyOSError:
pass
try:
self.interval = super(CronTask, self).return_value(" ".join([self.task, "interval"]))
except VyOSError:
self.interval = None
try:
byte_crontab_spec = super(CronTask, self).return_value(" ".join([self.task, "crontab-spec"]))
self.crontab_spec = byte_crontab_spec
except:
self.crontab_spec = None
def get_config():
conf = Config()
conf.set_level("system task-scheduler task")
tasks = conf.list_nodes("")
list_of_instanses=[]
for task in tasks:
list_of_instanses.append(CronTask(task.decode("utf-8")))
return list_of_instanses
def verify(config):
for task in config:
if task.interval and task.crontab_spec:
raise VyOSError(task, "can not use interval and crontab-spec at the same time!")
if task.interval:
result = re.search(b"(\d+)([mdh]?)", task.interval)
value = int(result.group(1))
suffix = result.group(2)
if not suffix or suffix == b"m":
if value > 60:
raise VyOSError("Interval in minutes must not exceed 60!")
task.minutes = "*/" + str(value)
elif suffix == b"h":
if value > 24:
raise VyOSError("Interval in hours must not exceed 24!")
task.minutes = "0"
task.hours = "*/" + str(value)
elif suffix == b"d":
if value > 31:
raise VyOSError("Interval in days must not exceed 31!")
task.minutes = "0"
task.hours = "0"
task.days = "*/" + str(value)
elif task.interval and task.crontab_spec:
raise VyOSError(task, "must define either interval or crontab-spec")
return None
def generate(config):
crontab = "/etc/cron.d/vyatta-crontab"
crontab_header = "### Added by /opt/vyatta/sbin/vyatta-update-crontab.py ###\n"
crontab_append = crontab_header
count = 0
for task in config:
if task.interval:
crontab_string = "{minutes} {hours} {days} {months} {days_of_week} {user} {executable} {arguments}\n".format(
minutes=task.minutes,
hours=task.hours,
days=task.days,
months=task.months,
days_of_week=task.days_of_week,
user=task.user,
executable=task.executable,
arguments=task.arguments
)
elif task.crontab_spec:
crontab_string = "{crontab_spec) {user} {executable} {arguments}\n".format(
crontab_spec=task.crontab_spec,
user=task.user,
executable=task.executable,
arguments=task.arguments
)
crontab_append = crontab_append + crontab_string
count = count + 1
if count > 0:
try:
f = io.open(crontab, "w")
f.write(crontab_append)
f.close()
except IOError:
print("Could not open /etc/crontab for write")
def apply(config):
pass
if __name__ == '__main__':
try:
c = get_config()
verify(c)
generate(c)
apply(c)
except VyOSError:
sys.exit(0)

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