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#!/bin/sh -e

# syntax: update-motd [port [hostname [ipaddr [protocol]]]]
# each argument can be given as the empty string to use the default

# port number from cmdline, then systemctl file, then 9090
# take the last Listen line; this will be the user-specified one
port=${1:-$(systemctl show --property Listen cockpit.socket |
              sed -E '$!d;$s/.*[^0-9]([0-9]+).*/\1/;')}
port=${port:-9090}

# hostname from cmdline, then `hostname -f`
hostname=${2:-$(hostname -f || hostname)}

# ip addr from cmdline, then default route source addr
ip=${3:-$(ip -o route get 255.0 2>/dev/null | sed -e 's/.*src \([^ ]*\) .*/\1/')}

# protocol from cmdline, then https
protocol=${4:-https}

hostname_url="${protocol}://${hostname}:${port}/"
ip_url="${ip:+ or ${protocol}://${ip}:${port}/}"

printf 'Web console: %s%s\n\n' "${hostname_url}" "${ip_url}"  > /run/cockpit/active.motd