From bfbbf4e6530d56e18054ecf0537fdcd3ccba1b17 Mon Sep 17 00:00:00 2001
From: Quentin Manfroi <quentin.manfroi@fr.clara.net>
Date: Mon, 19 Apr 2021 13:09:21 +0200
Subject: [PATCH] add install script and instructions

---
 install.sh       | 10 +++++++
 scripts/00-basic | 72 ++++++++++++++++++++++++++++++++++++++++++++++++
 2 files changed, 82 insertions(+)
 create mode 100644 install.sh
 create mode 100755 scripts/00-basic

diff --git a/install.sh b/install.sh
new file mode 100644
index 0000000..0541519
--- /dev/null
+++ b/install.sh
@@ -0,0 +1,10 @@
+#!/bin/bash
+
+truncate -s0 /etc/motd           # empty native static motd
+mkdir -p /etc/update-motd.d/     # create dedicated directory following ubuntu
+cp motd /etc/update-motd.d/      # copy the static motd banner into it
+chmod -x /etc/update-motd.d/*    # disable any existing script
+cp scripts/* /etc/update-motd.d/ # enable claranet motd
+
+echo "For distributions which does not use update-motd (e.g. ubuntu/debian), do not forget to add the following to /etc/pam.d/sshd:"
+echo "session    optional   pam_exec.so          stdout /etc/update-motd.d/00-basic"
diff --git a/scripts/00-basic b/scripts/00-basic
new file mode 100755
index 0000000..e46a742
--- /dev/null
+++ b/scripts/00-basic
@@ -0,0 +1,72 @@
+#!/bin/bash
+
+# display banner
+cat $(dirname $0)/motd
+
+# get load averages
+IFS=" " read LOAD1 LOAD5 LOAD15 <<<$(cat /proc/loadavg | awk '{ print $1,$2,$3 }')
+# get free memory
+IFS=" " read USED AVAIL TOTAL <<<$(free -htm | grep "Mem" | awk {'print $3,$7,$2'})
+# get processes
+PROCESS=`ps -eo user=|sort|uniq -c | awk '{ print $2 " " $1 }'`
+PROCESS_ALL=`echo "$PROCESS"| awk {'print $2'} | awk '{ SUM += $1} END { print SUM }'`
+PROCESS_ROOT=`echo "$PROCESS"| grep root | awk {'print $2'}`
+PROCESS_USER=`echo "$PROCESS"| grep -v root | awk {'print $2'} | awk '{ SUM += $1} END { print SUM }'`
+# get processors
+PROCESSOR_NAME=`grep "model name" /proc/cpuinfo | cut -d ' ' -f3- | awk {'print $0'} | head -1`
+PROCESSOR_COUNT=`grep -ioP 'processor\t:' /proc/cpuinfo | wc -l`
+
+W="\e[0;39m"
+G="\e[1;32m"
+
+echo -e "${W}system info:
+$W  Hostname....: $W${HOSTNAME}
+$W  Distro......: $W$(cat /etc/*release | grep "PRETTY_NAME" | cut -d "=" -f 2- | sed 's/"//g')
+$W  Kernel......: $W$(uname -sr)
+$W  Uptime......: $W$(uptime -p)
+$W  Load........: $G$LOAD1$W (1m), $G$LOAD5$W (5m), $G$LOAD15$W (15m)
+$W  Processes...:$W $G$PROCESS_ROOT$W (root), $G$PROCESS_USER$W (user), $G$PROCESS_ALL$W (total)
+$W  CPU.........: $W$PROCESSOR_NAME ($G$PROCESSOR_COUNT$W vCPU)
+$W  Memory......: $G$USED$W used, $G$AVAIL$W avail, $G$TOTAL$W total$W"
+
+# config
+max_usage=90
+bar_width=50
+# colors
+white="\e[39m"
+green="\e[1;32m"
+red="\e[1;31m"
+dim="\e[2m"
+undim="\e[0m"
+
+# disk usage: ignore zfs, squashfs & tmpfs
+mapfile -t dfs < <(df -H -x zfs -x squashfs -x tmpfs -x devtmpfs -x overlay --output=target,pcent,size | tail -n+2)
+printf "\ndisk usage:\n"
+
+for line in "${dfs[@]}"; do
+    # get disk usage
+    usage=$(echo "$line" | awk '{print $2}' | sed 's/%//')
+    used_width=$((($usage*$bar_width)/100))
+    # color is green if usage < max_usage, else red
+    if [ "${usage}" -ge "${max_usage}" ]; then
+        color=$red
+    else
+        color=$green
+    fi
+    # print green/red bar until used_width
+    bar="[${color}"
+    for ((i=0; i<$used_width; i++)); do
+        bar+="="
+    done
+    # print dimmmed bar until end
+    bar+="${white}${dim}"
+    for ((i=$used_width; i<$bar_width; i++)); do
+        bar+="="
+    done
+    bar+="${undim}]"
+    # print usage line & bar
+    echo "${line}" | awk '{ printf("%-31s%+3s used out of %+4s\n", $1, $2, $3); }' | sed -e 's/^/  /'
+    echo -e "${bar}" | sed -e 's/^/  /'
+done
+
+printf "\n"