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1 #!/usr/bin/env python |
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2 |
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3 import os.path |
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4 import sys |
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5 import shlex |
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6 import traceback |
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7 import time |
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8 |
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9 from optparse import OptionParser |
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10 |
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11 CONFIG_FILE = os.environ.get("JOBDAEMON_CFG", "jobdaemon.cfg") |
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12 |
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13 SLEEP = int(os.environ.get("JOBDAEMON_SLEEP", "60")) |
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14 |
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15 def fork(job): |
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16 pid = os.fork() |
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17 if pid: return pid |
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18 os.execv(job[0], job) |
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19 return -1 # never reached |
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20 |
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21 class Jobs(object): |
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22 |
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23 def __init__(self, filename): |
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24 self.load_config(filename) |
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25 |
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26 def load_config(self, filename): |
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27 print >> sys.stderr, "loading config file '%s'" % filename |
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28 plan, jobs = [], [] |
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29 f = open(filename, "r") |
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30 try: |
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31 while True: |
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32 line = f.readline() |
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33 if not line: break |
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34 line = line.strip() |
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35 if not line or line.startswith("#"): |
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36 continue |
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37 if line.startswith("BLOCKER:"): |
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38 line = line[len("BLOCKER:"):].strip() |
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39 plan.append((jobs, line)) |
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40 jobs = [] |
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41 continue |
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42 jobs.append(shlex.split(line)) |
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43 finally: |
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44 f.close() |
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45 |
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46 if jobs: plan.append((jobs, None)) |
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47 |
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48 self.plan = plan |
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49 |
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50 def run_jobs(self, jobs): |
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51 pids = [] |
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52 for job in jobs: |
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53 try: |
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54 pids.append(fork(job)) |
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55 except: |
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56 traceback.print_exc() |
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57 |
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58 for pid in pids: |
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59 try: |
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60 os.waitpid(pid, 0) |
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61 except: |
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62 traceback.print_exc() |
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63 |
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64 def run(self): |
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65 for jobs, blocker in self.plan: |
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66 self.run_jobs(jobs) |
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67 if blocker: |
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68 try: |
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69 os.system(blocker) |
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70 except: |
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71 traceback.print_exc() |
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72 |
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73 def main(): |
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74 |
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75 global config_changed |
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76 |
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77 parser = OptionParser() |
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78 |
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79 parser.add_option( |
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80 "-c", "--config", dest="config", |
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81 help="load configuration from file", |
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82 metavar="FILE", default=CONFIG_FILE) |
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83 |
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84 parser.add_option( |
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85 "-s", "--sleep", dest="sleep_time", |
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86 help="sleep time between runs", |
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87 type="int", |
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88 metavar="TIME", default=SLEEP) |
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89 |
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90 (options, _) = parser.parse_args() |
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91 |
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92 if not os.path.isfile(options.config): |
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93 print >> sys.stderr, "config file '%s' does not exists." |
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94 sys.exit(1) |
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95 |
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96 modtime = os.stat(options.config).st_mtime |
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97 |
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98 jobs = Jobs(options.config) |
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99 |
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100 while True: |
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101 if os.path.isfile(options.config): |
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102 nmodtime = os.stat(options.config).st_mtime |
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103 if nmodtime > modtime: |
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104 modtime = nmodtime |
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105 jobs = Jobs(options.config) |
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106 jobs.run() |
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107 time.sleep(options.sleep_time) |
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108 |
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109 if __name__ == '__main__': |
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110 main() |
