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-rwxr-xr-xsrc/conf_mode/vyos_update_crontab.py148
1 files changed, 148 insertions, 0 deletions
diff --git a/src/conf_mode/vyos_update_crontab.py b/src/conf_mode/vyos_update_crontab.py
new file mode 100755
index 000000000..c19b88007
--- /dev/null
+++ b/src/conf_mode/vyos_update_crontab.py
@@ -0,0 +1,148 @@
+#!/usr/bin/env python3
+#
+# Copyright (C) 2017 VyOS maintainers and contributors
+#
+# This program is free software; you can redistribute it and/or modify
+# it under the terms of the GNU General Public License version 2 or later 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/>.
+#
+#
+
+import os
+import re
+import sys
+
+from vyos.config import Config
+from vyos import ConfigError
+
+
+crontab_file = "/etc/cron.d/vyos-crontab"
+
+
+def format_task(minute="*", hour="*", day="*", dayofweek="*", month="*", user="root", rawspec=None, command=""):
+ fmt_full = "{minute} {hour} {day} {month} {dayofweek} {user} {command}\n"
+ fmt_raw = "{spec} {user} {command}\n"
+
+ if rawspec is None:
+ s = fmt_full.format(minute=minute, hour=hour, day=day,
+ dayofweek=dayofweek, month=month, command=command, user=user)
+ else:
+ s = fmt_raw.format(spec=rawspec, user=user, command=command)
+
+ return s
+
+def split_interval(s):
+ result = re.search(r"(\d+)([mdh]?)", s)
+ value = int(result.group(1))
+ suffix = result.group(2)
+ return( (value, suffix) )
+
+def make_command(executable, arguments):
+ if arguments:
+ return("{0} {1}".format(executable, arguments))
+ else:
+ return(executable)
+
+def get_config():
+ conf = Config()
+ conf.set_level("system task-scheduler task")
+ task_names = conf.list_nodes("")
+ tasks = []
+
+ for name in task_names:
+ interval = conf.return_value("{0} interval".format(name))
+ spec = conf.return_value("{0} crontab-spec".format(name))
+ executable = conf.return_value("{0} executable path".format(name))
+ args = conf.return_value("{0} executable arguments".format(name))
+ task = {
+ "name": name,
+ "interval": interval,
+ "spec": spec,
+ "executable": executable,
+ "args": args
+ }
+ tasks.append(task)
+
+ return tasks
+
+def verify(tasks):
+ for task in tasks:
+ if not task["interval"] and not task["spec"]:
+ raise ConfigError("Invalid task {0}: must define either interval or crontab-spec".format(task["name"]))
+
+ if task["interval"]:
+ if task["spec"]:
+ raise ConfigError("Invalid task {0}: cannot use interval and crontab-spec at the same time".format(task["name"]))
+
+ if not re.match(r"^\d+[mdh]?$", task["interval"]):
+ raise(ConfigError("Invalid interval {0} in task {1}: interval should be a number optionally followed by m, h, or d".format(task["name"], task["interval"])))
+ else:
+ # Check if values are within allowed range
+ value, suffix = split_interval(task["interval"])
+
+ if not suffix or suffix == "m":
+ if value > 60:
+ raise ConfigError("Invalid task {0}: interval in minutes must not exceed 60".format(task["name"]))
+ elif suffix == "h":
+ if value > 24:
+ raise ConfigError("Invalid task {0}: interval in hours must not exceed 24".format(task["name"]))
+ elif suffix == "d":
+ if value > 31:
+ raise ConfigError("Invalid task {0}: interval in days must not exceed 31".format(task["name"]))
+
+ if not task["executable"]:
+ raise ConfigError("Invalid task {0}: executable is not defined".format(task["name"]))
+ else:
+ # Check if executable exists and is executable
+ if not (os.path.isfile(task["executable"]) and os.access(task["executable"], os.X_OK)):
+ raise ConfigError("Invalid task {0}: file {1} does not exist or is not executable".format(task["name"], task["executable"]))
+
+def generate(tasks):
+ crontab_header = "### Generated by vyos-update-crontab.py ###\n"
+ if len(tasks) == 0:
+ if os.path.exists(crontab_file):
+ os.remove(crontab_file)
+ else:
+ pass
+ else:
+ crontab_lines = []
+ for task in tasks:
+ command = make_command(task["executable"], task["args"])
+ if task["spec"]:
+ line = format_task(command=command, rawspec=task["spec"])
+ else:
+ value, suffix = split_interval(task["interval"])
+ if not suffix or suffix == "m":
+ line = format_task(command=command, minute="*/{0}".format(value))
+ elif suffix == "h":
+ line = format_task(command=command, minute="0", hour="*/{0}".format(value))
+ elif suffix == "d":
+ line = format_task(command=command, minute="0", hour="0", day="*/{0}".format(value))
+ crontab_lines.append(line)
+
+ with open(crontab_file, 'w') as f:
+ f.write(crontab_header)
+ f.writelines(crontab_lines)
+
+def apply(config):
+ # No daemon restarts etc. needed for cron
+ pass
+
+
+if __name__ == '__main__':
+ try:
+ c = get_config()
+ verify(c)
+ generate(c)
+ apply(c)
+ except ConfigError as e:
+ print(e)
+ sys.exit(1)