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#!/bin/sh
#
# retry_cmd.sh [-n NLOOPS] [-s SLEEP] CMD
#
# Retry command until success or pre-specified number of failures
#
# 2018 Chris Markiewicz
# Released into public domain
NLOOPS=3
TOSLEEP=5
while true; do
case "$1" in
-n ) NLOOPS="$2"; shift 2 ;;
-s ) TOSLEEP="$2"; shift 2 ;;
-- ) shift; break ;;
* ) break ;;
esac
done
# Normalize whitespace in command, preserving quotes
CMD=""
for ARG; do
CMD="$CMD \"$ARG\"";
done
RET=0
for i in `seq $NLOOPS`; do
sh -c "$CMD"
RET="$?"
if [ "$RET" -eq 0 ]; then break; fi
if [ "$i" -ne "$NLOOPS" ]; then sleep $TOSLEEP; fi
done
exit $RET
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