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#!/usr/bin/python
#
# do-until - run a command until it succeeds
# Copyright (C) 2008, 2011 Lars Wirzenius
#
# This program is free software: you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation, either version 3 of the License, or
# (at your option) any later version.
#
# 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/>.
'''Run a command until it succeeds.'''
import cliapp
import subprocess
import sys
import time
class DoUntil(cliapp.Application):
def add_settings(self):
self.settings.boolean(['no-act', 'n'],
'Do not run command, just pretend to do it, '
'and pretend that it succeeds.')
self.settings.boolean(['verbose', 'v'],
'Print command before executing it.')
self.settings.integer(['sleep'],
'Wait SECS seconds before re-trying a command. '
'(Default is %default.)',
default=1)
self.settings.integer(['max-tries'],
'Try at most COUNT times, with 0 meaning forever. '
'(Default is %default.)',
default=0)
def process_args(self, argv):
tries = 0
max_tries = self.settings['max-tries']
while max_tries == 0 or tries < max_tries:
tries += 1
if self.settings['verbose']:
sys.stderr.write('do-until: attempt #%d: %s\n' %
(tries, ' '.join(argv)))
if self.settings['no-act']:
sys.stderr.write('do-until: not running command, '
'pretending it works anyway\n')
break
else:
p = subprocess.Popen(argv)
p.communicate()
if p.returncode == 0:
break
sys.stderr.write('do-until: attempt %d failed, '
'trying again in %d second(s)\n' %
(tries, self.settings['sleep']))
time.sleep(self.settings['sleep'])
if __name__ == '__main__':
DoUntil().run()
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