1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
|
#!/usr/bin/python3
#
# 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()
|
