port_is_used

#!/bin/bash
#
# return next free port for key
#
# usage: $OMD_ROOT/lib/port_is_used APACHE_TCP_PORT 5000


port_is_used () {
    local KEY=$1
    local PORT=$2
    for S in $(ls /omd/sites); do
        if [ ! -d /omd/sites/$S ]; then
            continue
        fi
        conf=/omd/sites/$S/etc/omd/site.conf
        if [ "${S}" = "${OMD_SITE}" ]; then
            if [ $(env | grep ^CONFIG_  | grep "=${PORT}$" | grep -v CONFIG_${KEY} | wc -l) -gt 0 ]; then
                return 0
            fi
        else
            if ! ls $conf >/dev/null 2>&1; then
                echo "ERROR: Failed to read config of site ${S}. ${KEY} port will possibly be allocated twice" >&2
                continue
            fi
            if [ $(grep -v ^#  < $conf | grep "='${PORT}'" | wc -l) -gt 0 ]; then
                return 0
            fi
        fi
    done
    return 1
}

KEY=$1
PORT=$2
while port_is_used "$KEY" "$PORT"; do
    PORT=$((PORT + 1))
done
echo "$PORT"