server-scripts/motd.sh

#!/usr/bin/env bash
dir=$(dirname "$0")

### Time and date ###
echo -e "$(date)"
echo -e

### Hostname ###
seed=$(echo $((0x$(hostname | md5sum | cut -c 1-10))) | cut -c 2-5)
echo -e "$(/usr/bin/env figlet -w $(tput cols) "$(hostname)" | /usr/bin/env lolcat -f -F 0.05 -S $seed)"
echo -e

### System info ###
echo -e "$(cat /etc/*release | grep PRETTY_NAME | cut -d = -f 2- | sed 's/\"//g') | Kernel: $(uname -r)"
uptime=$(uptime | awk -F'( |,|:)+' '{d=h=m=0; if ($7=="min") m=$6; else {if ($7~/^day/) {d=$6;h=$8;m=$9} else {h=$6;m=$7}}} {print d+0,"days,",h+0,"hours,",m+0,"minutes."}')
echo -e "Uptime: ${uptime}"
echo -e

### Colors ###
white="\e[39m"
green="\e[1;32m"
red="\e[1;31m"
magenta="\e[1;35m"
lightgreen="\e[1;92m"
lightred="\e[1;91m"
yellow="\e[1;33m"
lightyellow="\e[1;93m"
dim="\e[2m"
bold="\e[1m"
undim="\e[0m"

graybg="\e[40m"
redbg="\e[41m"
greenbg="\e[42m"

### Services ###
services=($(cat "$dir/.motd.services"))
# sort services
#IFS=$'\n' services=($(sort <<<"${services[*]}"))
#unset IFS

service_status=()
# get status of all services
for service in "${services[@]}"; do
    service_status+=($(systemctl is-active "$service"))
done
out="        SERVICE,STATUS\n"
out+="${bold}[SYSTEMD]${undim}\n"
for i in "${!services[@]}"; do
    # color green if service is active, else red
    if [[ "${service_status[$i]}" == "active" ]]; then
        out+="      - ${services[$i]},${green}${service_status[$i]}${undim}\n"
    elif [[ "${service_status[$i]}" != "inactive" ]] || [[ "$(systemctl is-enabled ${services[$i]})" == "enabled" ]]; then
        out+=" ${redbg}/!\\\\${undim}  - ${services[$i]},${red}${service_status[$i]}${undim}\n"
    else
        out+="      - ${services[$i]},${dim}${service_status[$i]} (disabled)${undim}\n"
    fi
done


### Docker ###
if command -v docker &> /dev/null; then
	out+="${bold}[DOCKER]${undim}\n"
	containers=($(docker ps --format "{{.Image}}/{{.Names}}"))
	container_statuses=($(docker ps --format "{{.State}}"))
	docker_out="     [root]\n"
	for i in ${!containers[@]}; do
		if [[ "${container_statuses[$i]}" == "running" ]]; then
			docker_out+="      - ${containers[$i]},${green}${container_statuses[$i]}${undim}\n"
		else
			docker_out+=" ${redbg}/!\\\\${undim}  - ${containers[$i]},${red}${container_statuses[$i]}${undim}\n"
		fi
	done

	docker_out+="     [rootless]\n"
	rootless_users=($(cat "$dir/.motd.users"))
	for user in ${rootless_users[@]}; do

		if sudo test ! -e /run/user/$(id -u $user)/docker.sock; then
			docker_out+=" ${redbg}/!\\\\${undim}  - $user,${red}! Docker not running !${undim}\n"
			continue
		fi

		containers=($(sudo -n DOCKER_HOST=unix:///run/user/$(id -u $user)/docker.sock docker ps --format "{{.Image}}/{{.Names}}"))
		container_statuses=($(sudo -n DOCKER_HOST=unix:///run/user/$(id -u $user)/docker.sock docker ps --format "{{.State}}"))
		if [ ${#containers[@]} -eq 0 ]; then
			docker_out+=" ${redbg}/!\\\\${undim}  - $user,${red}! No container !${undim}\n"
			continue
		fi

		docker_out+="      - $user\n"
		for i in ${!containers[@]}; do
			if [[ "${container_statuses[$i]}" == "running" ]]; then
				docker_out+="         - ${containers[$i]},${green}${container_statuses[$i]}${undim}\n"
			else
				docker_out+=" ${redbg}/!\\\\${undim}     - ${containers[$i]},${red}${container_statuses[$i]}${undim}\n"
			fi
		done
	done
	out+=$docker_out
fi

printf "$out" | column -ts $',' -o " "
echo -e

### Disk space ###
# config
max_usage=80
bar_width=50

# disk usage: ignore zfs, squashfs & tmpfs
DISKS=$(df -H -x squashfs -x tmpfs -x devtmpfs -x zfs -x overlay --output=target,pcent,size,used | tail -n+2)" 0 0 0 -"

if test $(command -v zfs); then
	DISKS+="\n"
	#DISKS+=$(zpool list -o name,capacity,size | tail -n+2)
	while read name available used usedsnap usedds usedchild compressratio; do
		ttlsize=$((($available+$used)))
		pcent=$(echo "($used/$ttlsize)*100" | bc -l | numfmt --format="%3.0f")
		gfxsize=$(numfmt --to=iec --format="%9f" $ttlsize)
		gfxused=$(numfmt --to=iec --format="%9f" $used)
		usedsnaprecursive=$(zfs get usedbysnapshots -r "$name" -H -p -t filesystem -o value | tail -n+2 | awk '{s+=$1} END {printf "%.0f", s}')
		usedsnappercent=$(echo "(($usedsnap + $usedsnaprecursive)/$ttlsize)*100" | bc -l | numfmt --format="%3.0f")
		useddspercent=$(echo "($usedds/$ttlsize)*100" | bc -l | numfmt --format="%3.0f")
		usedchildpercent=$(echo "(($usedchild - $usedsnaprecursive)/$ttlsize)*100" | bc -l | numfmt --format="%3.0f")
		DISKS+="$name $pcent% $gfxsize $gfxused $usedsnappercent $useddspercent $usedchildpercent x$compressratio\n"
	done <<< $(zfs list -H -p -d 0 -o name,available,used,usedsnap,usedds,usedchild,compressratio)
fi
printf "${bold}[DISK USAGE]${undim}\n"

while read line; do
	if [ -z "$line" ]; then
		continue
	fi
    # get disk usage
    dds=$(echo "$line" | awk '{print $6}' | sed 's/%//')
    if [ -z "$dds" ]; then
        dds_width=0
        child_width=0
        snap_width=0
        usage=$(echo "$line" | sed -E "s/.+([0-9]{2,3})%.+/\1/")
    else
        dds_width=$((($dds*$bar_width)/100))

        child=$(echo "$line" | awk '{print $7}' | sed 's/%//')
        child_width=$((($child*$bar_width)/100))

        snap=$(echo "$line" | awk '{print $5}' | sed 's/%//')
        snap_width=$((($snap*$bar_width)/100))

        usage=$(echo "$line" | awk '{print $2}' | sed 's/%//')
    fi

    used_width=$((($usage*$bar_width)/100))
    #echo "$line"
    #echo "$dds,$dds_width|$child,$child_width|$snap,$snap_width|$usage,$used_width"

	i=0
	# [
    bar="["

	# DDS
    if [ "${usage}" -ge "${max_usage}" ]; then
        bar+=$red
    else
        bar+=$green
    fi
    for ((; i<$dds_width; i++)); do
        bar+="="
    done

    # CHILDREN
    if [ "${usage}" -ge "${max_usage}" ]; then
        bar+=$lightred
    else
        bar+=$lightgreen
    fi
    for ((; i<(($dds_width + $child_width)); i++)); do
        bar+="="
    done

	# SNAP
    bar+=$lightyellow
    for ((; i<(($dds_width + $child_width + $snap_width)); i++)); do
        bar+="="
    done

	# TOTAL USAGE
    if [ "${usage}" -ge "${max_usage}" ]; then
        bar+=$red
    else
        bar+=$green
    fi
    for ((; i<$used_width; i++)); do
        bar+="="
    done

    # FREE SPACE
    bar+="${white}${dim}"
    for ((; i<$bar_width; i++)); do
        bar+="="
    done

    # ]
    bar+="${undim}]"

    # print usage line & bar
    echo -e "${line}" | awk '{ printf("     %-19scompratio %+5s  %+4s/%+4s  [%+3s]\n", $1, $8, $4, $3, $2); }'
    if [ "${usage}" -ge "${max_usage}" ]; then
      echo -en " ${redbg}/!\\\\${undim} "
   	else
   	  echo -en "     "
   	fi
    echo -e "${bar}"
done <<< $(echo -e "$DISKS")
echo -e

### ZFS available space warning ###
if test $(command -v zfs); then
	POOLS=$(zfs list -o name,used,available -p | tail -n+2)
	while read line; do
		name=$(echo "$line" | awk '{print $1}')
		used=$(echo "$line" | awk '{print $2}')
		avail=$(echo "$line" | awk '{print $3}')

		percentage=$(echo "scale=2;$avail/($used+$avail)*100" | bc)

		if (( $(echo "$percentage < 20" | bc -l) )); then
			echo -e " ${redbg}/!\\\\${undim} ${bold}$name ${undim}only has ${percentage}% capacity left"
		fi
	done <<< $(echo -e "$POOLS")
fi
echo -e

### Welcome message ###
LAST_LOGIN=$(last -w --time-format full | grep $(whoami) | head -2 | tail -1)
echo -e "     Welcome to $(hostname | /usr/bin/env lolcat -f -F 0.05 -S $seed), ${green}$(whoami)${undim}!"
echo -e "     Last login: ${bold}$(echo "$LAST_LOGIN" | awk '{print $3}')${undim} | [$(echo "$LAST_LOGIN" | awk '{for(i=4;i<=NF;i++) print $i}' | paste -sd ' ')]"