# Modifies NetworkManager-wait-online.service to replaces the call of
# nm-online by waiting for all the wanted routes to be up and that a
# gateway is reachable.

# Uses ip and fping.

# To install for example as:
#
#  /etc/systemd/system/NetworkManager-wait-online.service.d/routes-gw.conf
#
# Then adjust the ROUTES GW MAXWAIT variables below.

[Service]
ExecStart=
ExecStart=/bin/bash -c "LF=$'\n'; "' \
ROUTES=" \
  default \
  1.2.3.0/24 \
  4.5.6.0/24 \
"; \
GW=1.2.3.254; \
 \
MAXWAIT=60; \
 \
routes_defined () { \
    local routes=$(ip route); \
    echo "$routes"; \
    for i in $ROUTES; do \
        [[ "$LF$routes" == *$LF$i* ]] || return 1; \
    done; \
    return 0; \
}; \
 \
while (( SECONDS <= MAXWAIT)); do \
    if routes_defined; then \
        echo Network Manager Wait Online routes took $SECONDS seconds; \
        seconds=$SECONDS; \
        if fping -q -a -r $MAXWAIT -t 1000 -B 1 $GW >& /dev/null; then \
            s=$((SECONDS-seconds)); \
            echo Network Manager Wait Online gateway took $s seconds; \
            exit 0; \
        else \
            s=$((SECONDS-seconds)); \
            echo Network Manager Wait Online gateway failed after $s seconds; \
            exit 1; \
        fi; \
    fi; \
    sleep 1; \
done; \
echo Network Manager Wait Online routes failed after $SECONDS seconds; \
exit 1; \
 \
'