ssh_tools.sh

#!/bin/sh

connection_retries=30
connection_retrysleep=60

function retry_ssh {
    n=0
    while [[ 1 ]]; do
        $sshcmd "$1" \
            && break || \
            {
                code="$?"
                if [[ "$code" -eq 255 ]]; then
                    >&2 echo "Retrying ssh ..."
                    sleep $connection_retrysleep
                else
                    >&2 echo "\"$1\" returned exit code $code."
                    return "$code"
                fi
            }
        n=$[$n+1]
        if [[ $n -ge $connection_retries ]]; then
            >&2 echo "Cannot connect to server"
            return 255
        fi
    done
    return 0
}

function retry_rsync {
    n=0
    while [[ 1 ]]; do
        rsync -e "$sshcmd" $@ \
            && break || \
            {
                code="$?"
                code="$?"
                if [[ "$code" -eq 255 ]]; then
                    >&2 echo "Retrying rsync ..."
                    sleep $connection_retrysleep
                else
                    >&2 echo "\"$1\" returned exit code $code."
                    return "$code"
                fi
            }
        n=$[$n+1]
        if [[ "$n" -ge $connection_retries ]]; then
            echo "Cannot connect to server"
            exit 255
        fi
    done
    return 0
}