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#!/usr/bin/env python3
import argparse
import subprocess
import time
import sys
def get_args() -> argparse.ArgumentParser:
parser = argparse.ArgumentParser()
parser.add_argument("--delay", type=float, default=3,
help="Initial delay before retry, in seconds")
parser.add_argument("--count", type=int, default=5, help="Total number of tries")
parser.add_argument("--factor", type=float, default=2,
help="Exponential backoff factor")
parser.add_argument("cmd", nargs=argparse.REMAINDER)
return parser
def log(value: str) -> None:
print(value)
sys.stdout.flush()
def main() -> None:
args = get_args().parse_args()
if not args.cmd:
log("No command supplied")
sys.exit(1)
retcode = None
for n in range(args.count):
try:
log("Running %s [try %d/%d]" % (" ".join(args.cmd), (n+1), args.count))
subprocess.check_call(args.cmd)
except subprocess.CalledProcessError as e:
retcode = e.returncode
else:
log("Command succeeded")
retcode = 0
break
if args.factor == 0:
wait_time = (n+1) * args.delay
else:
wait_time = args.factor**n * args.delay
if n < args.count - 1:
log("Command failed, waiting %s seconds to retry" % wait_time)
time.sleep(wait_time)
else:
log("Command failed, out of retries")
sys.exit(retcode)
if __name__ == "__main__":
main()
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