Initial commit

LICENSE

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+MIT License
+
+Copyright (c) 2020 Baptiste DE RENZO
+
+Permission is hereby granted, free of charge, to any person obtaining a copy
+of this software and associated documentation files (the "Software"), to deal
+in the Software without restriction, including without limitation the rights
+to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+copies of the Software, and to permit persons to whom the Software is furnished
+to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice (including the next
+paragraph) shall be included in all copies or substantial portions of the
+Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS
+FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS
+OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
+WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF
+OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.

README.md

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+# Dynamic MOTD
+
+## Setup
+
+To install this, with root rights:
+
+* Clone the repo
+* Install: `sudo ./install -u <user>`
+* Add, configure or remove widgets: `ls ./widgets`
+* Run interactively: `sudo ./generate`
+
+## Profit
+
+```
+              .  o ..
+              o . o o..o.                __ __
+                .  ..o..  .             |  |  |_ _ ___ ___ ___
+                      o    o            |     | | | . | -_|  _|
+                   __|=|__|=|__         |__|__|_  |  _|___|_|
+               ___|____________|____          |___|_|
+              | o o o o o o o o o  /
+     ~  ~ ~~~~'~~~~~~~~~~~~~~~~~~~'~~~~ ~  ~
+
+  system info:                            network:
+    system load:   0.00  process:  99       public ip:   10.20.30.40
+    cpu usage:     0%    uptime:   10d      private ip:  192.168.0.10
+    memory usage:  10%   users:    1
+                                          certificates:
+  services:                                 google.fr        valid  01/01/2020
+    apparmor:    active    cron:  active    debian.org       valid  01/01/2020
+    logrotate:   inactive  lxc:   active    wikipedia.org    valid  01/01/2020
+    networking:  active    sshd:  active    domain.org       valid  01/01/2020
+
+  containers:                             disk usage:
+    git:   stopped  mailer:  stopped                   Size  Used  Free  Use%
+    dlna:  running  plex:    stopped        /         10.0G  1.0G  9.0G   10%
+```

generate

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+#!/usr/bin/env bash
+
+# system info:                            network:
+#   system load:   0.00  process:  99       public ip:   10.20.30.40
+#   cpu usage:     0%    uptime:   10d      private ip:  192.168.1.2
+#   memory usage:  10%   users:    1
+#                                         certificates:
+# services:                                 google.fr        valid  01/01/2020
+#   apparmor:    active    cron:  active    debian.org       valid  01/01/2020
+#   logrotate:   inactive  lxc:   active    wikipedia.org    valid  01/01/2020
+#   networking:  active    sshd:  active
+#                                         disk usage:
+# lxc status:                                        Size  Used  Free  Use%
+#   git:   stopped  mailer:  stopped        /       10.0G  1.0G  9.0G   10%
+#   dlna:  running  plex:    stopped
+
+# go to script dir
+cd "$(dirname "$(readlink -f "$0")")"
+
+# remove old values
+if [[ $1 == '-f' ]]; then
+    rm -f /tmp/.motd.*
+fi
+
+# print header
+cat headers/*
+
+# get widgets
+cd widgets
+for m in L*.sh; do
+    LEFT+="$(./$m)\n"
+done
+for m in R*.sh; do
+    RIGHT+="$(./$m)\n"
+done
+
+# print widgets
+paste <(echo -e "$LEFT") <(echo -e "$RIGHT") -d '@' | sed -e 's,@, @ ,' | column -ts '@'
+

headers/header.txt

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+
+              .  o ..
+              o . o o..o.                __ __         
+                .  ..o..  .             |  |  |_ _ ___ ___ ___
+                      o    o            |     | | | . | -_|  _|
+                   __|=|__|=|__         |__|__|_  |  _|___|_|
+               ___|____________|____          |___|_|
+              | o o o o o o o o o  /
+     ~  ~ ~~~~'~~~~~~~~~~~~~~~~~~~'~~~~ ~  ~

install

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+#!/usr/bin/env bash
+
+# go to script dir
+cd "$(dirname "$(readlink -f "$0")")"
+
+# parse args
+while [[ "$1" =~ ^- && ! "$1" == "--" ]]; do
+    case "$1" in
+        -u|--user)      shift; user="$1";;
+    esac
+    shift
+done
+
+# get homedir
+home="$(getent passwd "${user}" | cut -d: -f6)"
+
+# motd file
+motd='/tmp/.motd'
+
+# add cron rule
+cron='/etc/cron.hourly/motd'
+cat <<EOF > "${cron}"
+#!/usr/bin/env bash
+$(pwd)/generate > "${motd}"
+EOF
+chmod +x "${cron}"
+
+# add print 
+bashrc="${home}/.bashrc"
+cat <<EOF >> "${bashrc}"
+# motd supervision
+if [[ -f "${motd}" ]]; then
+    clear && cat "${motd}"
+fi
+EOF
+

preview

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+#!/usr/bin/env bash
+
+# go to local dir
+cd "$(dirname "$(readlink -f "$0")")"
+
+# view widgets
+echo
+cd widgets
+paste <(ls L[0-9]*) <(ls R[0-9]*) | column -t | sed 's,^,  ,'
+echo

tools/colors.sh

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+#!!/bin/bash
+
+# Reset
+reset="\e[0m"           # Text Reset
+
+# regular colors
+black="\e[0;30m"        # black
+red="\e[0;31m"          # Red
+green="\e[0;32m"        # Green
+yellow="\e[0;33m"       # Yellow
+blue="\e[0;34m"         # blue
+purple="\e[0;35m"       # Purple
+cyan="\e[0;36m"         # Cyan
+white="\e[0;37m"        # White
+
+# bold
+bblack="\e[1;30m"       # Black
+bred="\e[1;31m"         # Red
+bgreen="\e[1;32m"       # Green
+byellow="\e[1;33m"      # Yellow
+bblue="\e[1;34m"        # Blue
+bpurple="\e[1;35m"      # Purple
+bcyan="\e[1;36m"        # Cyan
+bwhite="\e[1;37m"       # White
+
+# c_if '2' '<' '5' '%'
+c_if(){
+    if (( ${1%%.*} $2 ${3%%.*} )); then
+        echo "${bgreen}$1${@:4}${reset}"
+    else
+        echo "${bred}$1${@:4}${reset}"
+    fi
+}
+# c_if '2' '<' '5' 'r1' 'r2'
+c_if_r(){
+    if (( ${1%%.*} $2 ${3%%.*} )); then
+        echo "${bgreen}${4}${reset}"
+    else
+        echo "${bred}${5}${reset}"
+    fi
+}
+# c_match 'abc' 'def' 'pkgs'
+c_match(){
+    if [[ ${1%%.*} = ${2%%.*} ]]; then
+        echo "${bgreen}$1${@:3}${reset}"
+    else
+        echo "${bred}$1${@:3}${reset}"
+    fi
+}
+
+# c_match_r 'abc' 'def' 'r1' 'r2'
+c_match_r(){
+    if [[ ${1%%.*} = ${2%%.*} ]]; then
+        echo "${bgreen}${3}${reset}"
+    else
+        echo "${bred}${4}${reset}"
+    fi
+}

tools/cpu.sh

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+#!/bin/bash
+renice -n 20 -p "$$" &>/dev/null
+
+iter=2
+delay=0.5
+
+# 0     1       2    3       4          5      6   7       8     9     10
+#       user    nice system  idle       iowait irq softirq steal guest guest_nice
+# cpu   180288  509  316177  443927540  53229  0   5395    0     0     0
+
+# init
+previous_idle=0
+previous_total=0
+for i in $(seq "${iter}"); do
+        cpu=( $(grep '^cpu ' /proc/stat) )
+        unset cpu[0]
+        # compute idle cpu time
+        idle=$(( ${cpu[4]} + ${cpu[5]} ))
+        # compute total cpu time
+        total=$(( ${cpu[@]/%/+}0 ))
+        # compute cpu usage since last check
+        idle_d=$(( idle - previous_idle ))
+        total_d=$(( total - previous_total ))
+        cpu_usage=$(( 100*(total_d-idle_d)/total_d ))
+        # remember cpu total and idle for next check
+        previous_total="${total}"
+        previous_idle="${idle}"
+        # wait before next check
+        sleep "${delay}"
+done
+echo "${cpu_usage}" # %
+

widgets/L01-sysinfo.sh

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+#!/usr/bin/env bash
+
+#  system info:
+#    system load:   0.01  process:  120
+#    cpu usage:     0%    uptime:   30d
+#    memory usage:  5%    users:    1
+#    temperature:   45°c
+
+mem_warn=50  # %
+cpu_warn=20  # %
+temp_warn=60 # °c
+
+ps="$(ps -haux | wc -l)"
+load="$(cat /proc/loadavg | cut -d' ' -f3)"
+users="$(w -h | wc -l)"
+up="$(( $(cat /proc/uptime | cut -d'.' -f1) / 3600 / 24 ))"
+mem="$(free -b | awk 'FNR == 2 {p=100*$3/$2} END{printf("%0.f",p)}')"
+cpunb="$(grep -i '^processor' /proc/cpuinfo | wc -l)"
+cpu="$(../tools/cpu.sh)"
+
+source ../tools/colors.sh
+#ps=$(c_if $ps '<' '150')
+mem=$(c_if  "${mem}"  '<' "${mem_warn}" '%')
+load=$(c_if "${load}" '<' "$cpunb")
+cpu=$(c_if  "${cpu}"  '<' "${cpu_warn}" '%')
+
+out+="system load:|${load}|process:|${ps}\n"
+out+="cpu usage:|${cpu}|uptime:|${up}d\n"
+out+="memory usage:|${mem}|users:|${users}\n"
+
+if [[ -f '/sys/class/thermal/thermal_zone0/temp' ]]; then
+    temp="$(( $(cat /sys/class/thermal/thermal_zone0/temp) / 1000 ))"
+    temp=$(c_if "${temp}" '<' "${temp_warn}" '°c')
+    out+="|temperature:|${temp}"
+fi
+
+echo
+echo 'system info:'
+echo -e "${out}" | column -ts'|' | sed 's,^,  ,'
+

widgets/L02-services.sh

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+#!/usr/bin/env bash
+
+#  services:
+#    apparmor:   active    cron:  active
+#    logrotate:  inactive  lxc:   active
+#    network:    active    sshd:  active
+
+columns=2
+services=( 'apparmor' 'cron' 'logrotate.timer' 'sshd' 'networking' 'lxc' 'netfilter-persistent' 'lxcfs')
+svc_names=('apparmor' 'cron' 'logrotate'       'sshd' 'network'    'lxc' 'iptables'             'lxcfs')
+
+out=''
+source ../tools/colors.sh
+for i in "${!services[@]}"; do
+    svc_status=$(systemctl is-active "${services[${i}]}")
+    svc_status=$(c_match "${svc_status}" 'active')
+    out+="${svc_names[$i]}:|${svc_status}|"
+    (( $(( (i+1) % columns )) == 0 )) && out+='\n'
+done
+out+='\n'
+
+echo
+echo 'services:'
+echo -e "${out}" | column -ts '|' | sed -e 's/^/  /'
+

widgets/L03-lxc.sh

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+#!/usr/bin/env bash
+
+#  lxc status:
+#    git:   stopped  mailer:  stopped
+#    dlna:  running  plex:    stopped
+
+columns=2
+
+# Get containers
+mapfile -t containers < <(lxc-ls -f | awk '{ print $1,$2 }' | sed '/^\s*$/d' | tail -n +2)
+
+out=''
+source ../tools/colors.sh
+for i in "${!containers[@]}"; do
+    IFS=" " read name status <<< "${containers[$i]}"
+    status=$(c_match "${status}" 'RUNNING')
+    out+="${name}:|${status,,}|"
+    (( $(( (i+1) % columns )) == 0 )) && out+='\n'
+done
+out+='\n'
+
+echo
+echo 'containers:'
+echo -e "${out}" | column -ts '|' | sed -e 's/^/  /'
+

widgets/L04-pkgs.sh

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+#!/usr/bin/env bash
+
+#  packages:
+#    3 new packages avalaible...
+
+date=$(date +%Y%m%d)
+tmp=/tmp/.motd.pkgs
+
+[[ -r "${tmp}" ]] && source "${tmp}"
+if [[ "${lastupdate}" != "${date}" ]]; then
+    source ../tools/colors.sh
+    apt-get -qq update
+    pkgs=$(apt -qq list --upgradable 2>/dev/null | wc -l)
+    pkgs=$(c_if_r "${pkgs}" '<' '1' 'no new package' "${pkgs} new packages")
+    echo "lastupdate=${date}" >  "${tmp}"
+    echo "pkgs='${pkgs}'"     >> "${tmp}"
+fi
+
+echo
+echo 'packages:'
+echo -e "  ${pkgs} avalaible..."
+

widgets/R01-network.sh

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+#!/usr/bin/env bash
+
+#  network:
+#    public ip;    215.105.10.10
+#    private ip:   192.168.1.10
+
+date=$(date +%Y%m%d)
+tmp=/tmp/.motd.network
+domain=bdr.ddns.net
+
+[[ -r "${tmp}" ]] && source "${tmp}"
+if [[ "${lastupdate}" != "${date}" ]]; then
+    privateip=$(hostname -I | cut -d' ' -f1)
+    publicip=$(dig +short "${domain}")
+    echo "lastupdate=${date}"     >  "${tmp}"
+    echo "publicip=${publicip}"   >> "${tmp}"
+    echo "privateip=${privateip}" >> "${tmp}"
+fi
+
+out=''
+out+="public ip:|${publicip}\n"
+out+="private ip:|${privateip}\n"
+
+echo
+echo 'network:'
+echo -e "${out}" | column -ts'|' | sed 's,^,  ,'
+