#!/bin/sh

# PROVIDE: gnbd
# REQUIRE: NETWORKING
#
# Configuration settings for gnbd in /etc/rc.conf:
#
# gnbd_enable (bool):                    Enable gnbd. (default=NO)
# gnbd_devices (list):                   List of devices.
# gnbd_<device>_host (str):              Required. Host to connect to.
# gnbd_<device>_conns (int):             Use this many parallel connections.
# gnbd_<device>_port (int):              Port to connect to.
# gnbd_<device>_exportname (str):        Connect to the named export.
# gnbd_<device>_cacert (str):            Verify TLS connections against the PEM-formatted
#                                        CA certificate at the given path.
# gnbd_<device>_cert (str):              Make a TLS connection using the PEM-formatted
#                                        client certificate at the given path.
# gnbd_<device>_key (str):               Make a TLS connection using the PEM-formatted
#                                        client key at the given path.
# gnbd_<device>_waitsec (int):           Retry until connections are re-established, waiting
#                                        this many seconds between successive retries.
#
# Commands for gnbd:
#
# start:          Connect to <device>.
# stop:           Disconnect from <device>.
# restart:        Reconnect to <device>.
#                 Tip: Use the devd.conf(5) file included with this port.
# status:         Get status of each <device>.
#
# Examples:
#
#   service gnbd start - Connect to all devices.
#   service gnbd stop - Disconnect from all devices.
#   service gnbd start <device> - Connect to a specific device.

. /etc/rc.subr

name="gnbd"
desc="NBD client for FreeBSD GEOM framework"
rcvar="${name}_enable"
start_precmd="gnbd_prestart"
start_cmd="gnbd_start"
stop_cmd="gnbd_stop"
restart_cmd="gnbd_restart"
status_cmd="gnbd_status"
gnbd_bin="%%PREFIX%%/sbin/${name}"

load_rc_config $name

: ${gnbd_enable:="NO"}

gnbd_prestart()
{
	${gnbd_bin} load
}

gnbd_start()
{
    local device="$1"

    local host conns port exportname cacert cert key
    local var

    for var in host conns port exportname cacert cert key; do
        eval ${var}="\${gnbd_${device}_${var}}"

        local value

        eval value="\$${var}"

        if [ -n "${value}" ]; then
            debug "${var}=${value}"
        fi
    done

    if [ -z "${host}" ]; then
        echo "gnbd_${device}_host: host is not configured, ignoring this device..."
        return 1
    fi

    local gnbd_args=

    if [ -n "${conns}" ]; then
        gnbd_args="-c ${conns}"
    fi

    if [ -n "${port}" ]; then
        gnbd_args="${gnbd_args} -p ${port}"
    fi

    if [ -n "${exportname}" ]; then
        gnbd_args="${gnbd_args} -n \"${exportname}\""
    fi

    if [ -n "${cacert}" ]; then
        gnbd_args="${gnbd_args} -A \"${cacert}\""
    fi

    if [ -n "${cert}" ]; then
        gnbd_args="${gnbd_args} -C \"${cert}\""
    fi

    if [ -n "${key}" ]; then
        gnbd_args="${gnbd_args} -K \"${key}\""
    fi

    if [ -n "${gnbd_args}" ]; then
        debug "gnbd args: ${gnbd_args}"
    fi

    if [ ! -c "/dev/${device}" ]; then
        eval ${gnbd_bin} connect ${gnbd_args} ${host}
    fi
}

gnbd_stop()
{
    local device="$1"

    if [ -c "/dev/${device}" ]; then
        ${gnbd_bin} disconnect ${device}
    fi
}

gnbd_restart()
{
    local device="$1"

    local waitsec

    eval waitsec="\${gnbd_${device}_waitsec}"

    local gnbd_args=

    if [ -n "${waitsec}" ]; then
        gnbd_args="-r ${waitsec}"

        debug "waitsec=${waitsec}"
    fi

    if [ -n "${gnbd_args}" ]; then
        debug "gnbd args: ${gnbd_args}"
    fi

    eval ${gnbd_bin} reconnect ${gnbd_args} ${device}
}

gnbd_status()
{
    local device="$1"

    if [ -c "/dev/${device}" ]; then
        ${gnbd_bin} status -s "${device}"
    fi
}

cmd="$1"

if [ $# -gt 0 ]; then
    shift
fi

if [ -n "$1" ]; then
    gnbd_devices="$1"
fi

if [ -z "${gnbd_devices}" ]; then
    warn "No devices are configured, configure one to make this rc script useful!"
fi

for device in ${gnbd_devices}; do
    run_rc_command "${cmd}" "${device}"
done