gistfile1.py

@@ -0,0 +1,115 @@
+#!/usr/bin/python2
+import sys
+import os
+
+def files(dirname):
+    return filter(os.path.isfile, map(lambda f: os.path.join(dirname, f), os.listdir(dirname)))
+
+CRONTAB_FILES = ['/etc/crontab'] + files('/etc/cron.d')
+ANACRONTAB_FILES = ['/etc/anacrontab']
+USERCRONTAB_FILES = files('/var/spool/cron')
+
+TARGER_DIR = sys.argv[1]
+
+def parse_crontab(filename, withuser=True, monotonic=False):
+    basename = os.path.basename(filename)
+    with open(filename, 'r') as f:
+        for line in f.readlines():
+            if line.startswith('#'):
+                continue
+
+            line = line.strip()
+            if not line or '=' in line:
+                continue
+
+            parts = line.split()
+
+            if monotonic:
+                period, delay, jobid = parts[0:3]
+                command = parts[3:]
+
+                yield {
+                        'p': period.lstrip('@'),
+                        'd': delay,
+                        'j': jobid,
+                        'c': ' '.join(command)
+                        }
+
+            else:
+                if line.startswith('@'):
+                    yield {
+                            'p': parts[0].lstrip('@'),
+                            'c': ' '.join(parts[1:])
+                            }
+                else:
+                    minutes, hours, days = parts[0:3]
+                    dows, months = parts[3:5]
+                    user, command = (parts[5], parts[6:]) if withuser else (basename, parts[5:])
+
+                    yield {
+                            'm': parse_time_unit(minutes, range(0, 60)),
+                            'h': parse_time_unit(hours, range(0, 24)),
+                            'd': parse_time_unit(days, range(1, 32)),
+                            'w': parse_time_unit(dows, ['Sun', 'Mon', 'Tue', 'Wed', 'Thu', 'Fri', 'Sat'], dow_map),
+                            'M': parse_time_unit(months, range(1, 13), month_map),
+                            'u': user,
+                            'c': ' '.join(command)
+                            }
+
+def parse_time_unit(value, values, mapping=int):
+    if value == '*':
+        return ['*']
+    return list(reduce(lambda a, i: a + set(i), map(values.__getitem__,
+            map(parse_period(mapping), value.split(',')))))
+
+def month_map(month):
+    month = month.lower()
+    try:
+        return ['jan', 'feb', 'mar', 'apr', 'may', 'jun', 'jul', 'aug', 'sep', 'nov', 'dec'].index(month.lower()[0:3]) + 1
+    except ValueError:
+        return int(month)
+
+def dow_map(dow):
+    try:
+        return ['sun', 'mon', 'tue', 'wed', 'thu', 'fri', 'sat'][int(dow) % 7]
+    except ValueError as e:
+        return dow[0:3].lower()
+
+def parse_period(mapping=int):
+    def parser(value):
+        try:
+            range, step = value.split('/')
+        except ValueError:
+            return mapping(value)
+
+        if range == '*':
+            return slice(None, None, int(step))
+
+        try:
+            start, end = range.split('-')
+        except ValueError:
+            return slice(mapping(range), None, int(step))
+
+        return slice(mapping(start), mapping(end), int(step))
+
+    return parser
+
+#for filename in CRONTAB_FILES:
+    #for job in parse_crontab(filename, withuser=True):
+        #pass
+
+#for filename in ANACRONTAB_FILES:
+    #for job in parse_crontab(filename, monotonic=True):
+        #pass
+
+for filename in USERCRONTAB_FILES:
+    for job in parse_crontab(filename, withuser=False):
+        if 'p' in job:
+            if job['p'] == 'reboot':
+                print 'OnBootSec=5'
+            else:
+                print 'OnCalendar=%s' % job['p']
+
+        else:
+            print 'OnCalendar=%s %s-%s %s:%s' % (','.join(job['w']), ','.join(map(str, job['M'])),
+                ','.join(map(str, job['d'])), ','.join(map(str, job['h'])), ','.join(map(str, job['m'])))