bash function that progresive retries a command with support of "ok exit codes"

simple_retry.sh

# $1 exit code
# $2 ok exit codes (comma separeted)
#
verify_exitcode(){
 local j
 for j in ${2//,/ };do
   if [ $j -eq $1 ]; then
        echo "[info] assume exit code $j as ok"
        return 0
   fi
 done
 return $1
}

# accepts:
#  $1: retries count
#  $2: seconds to wait between retries
#  $3(optional): ok exit codes in the form of list separeted by commas. Ex: "0,1,2,3"
#  $4: command
#  $5,...: command arguments
#
# Control Variables
#  RETRY_INCREMENT_SECS (default is 30) : increment each subsequent retry timeout by this number of seconds
#
retry(){
        local retries retry_wait_secs ok_exitcodes cmd j
        RETRY_INCREMENT_SECS="${RETRY_INCREMENT_SECS:-30}"

        [ $# -lt 3 ] && {
                echo "func retry() accepts at least 3 args: retries, sleep time, cmd"
                exit 2
        }
        retries=$1 && shift
        retry_wait_secs=$1 && shift
        if [[ $1 =~ ^[0-9] ]];then
                ok_exitcodes=$1 && shift
        else
                ok_exitcodes=0
        fi
        cmd="$1" && shift

        printf "\n[info] going to try $retries times pausing for $retry_wait_secs seconds in between..."
        for j in $(seq $retries); do
                printf "\n[info] try $j...\n"

                $cmd -- "$@"
                verify_exitcode $? $ok_exitcodes

                if [ $? -eq 0 ]; then
                        exit 0
                elif [ $j -ne $retries ]; then
                        printf "\n[info] sleeping for ${retry_wait_secs} seconds before retry...\n\n"
                        sleep $retry_wait_secs
                else
                        exit $?
                fi
                : $(( retry_wait_secs += RETRY_INCREMENT_SECS ))
        done
}



retry 3 2 ls "not existing file"