From 64527ae96ac402080cf5154377a7e84486a2f219 Mon Sep 17 00:00:00 2001
From: trotFunky <teo.couprie_diaz@telecom-sudparis.eu>
Date: Sat, 7 Dec 2019 22:13:13 +0100
Subject: [PATCH] Wrote an apt watcher script

---
 Perso/AptUpdateWatcher.sh | 61 +++++++++++++++++++++++++++++++++++++++
 1 file changed, 61 insertions(+)
 create mode 100755 Perso/AptUpdateWatcher.sh

diff --git a/Perso/AptUpdateWatcher.sh b/Perso/AptUpdateWatcher.sh
new file mode 100755
index 0000000..ee0afbe
--- /dev/null
+++ b/Perso/AptUpdateWatcher.sh
@@ -0,0 +1,61 @@
+#! /bin/bash
+
+# This script updates the apt database if running as root and retrieves the number of upgradable packages.
+# If the count is high enough or if some important packages can be upgraded, inform the administrator.
+
+
+while getopts ":c:p:h" option; do
+	case ${option} in
+		c )
+			trigger_count=$OPTARG
+			;;
+		p )
+			# Add each matching option to the array
+			key_packages+=("$OPTARG")
+			;;
+		h | \? | : )
+			echo "Usage : AptUpdateWatcher [-c count] [-p package matching regex] [-h] [-?]"
+			echo "	-c : Change the minimum count of upgradable packages before sending a warning"
+			echo "	-p : Add an expression to watch for important packages. If a package matching this option is found, send a warning"
+			echo "	-h/-? : Prints this message"
+			exit 1
+			;;
+	esac
+done
+
+# Use default options if nothing provided
+
+if [ -z "$trigger_count" ]; then
+	trigger_count=20
+fi
+
+if [ -z "$key_packages" ]; then
+	key_packages=( "ssh" "ssl" "apache" "kernel" )
+fi
+
+
+if [ "$EUID" -eq 0 ]; then
+	apt-get update
+fi
+
+upgradable_packages="$(apt-get -s -V upgrade | grep -e'=>')"
+upgradable_count=$(echo "$upgradable_packages" | wc -l)
+
+if [ $upgradable_count -gt $trigger_count ]; then
+	output="There are more than $trigger_count packages ready to upgrade ($upgradable_count packages):\n"
+	output+="$upgradable_packages\n\n"
+fi
+
+for expression in "${key_packages[@]}"; do
+	matching_packages=$(echo "$upgradable_packages" | grep -e"$expression")
+	if [ -n "$matching_packages" ]; then
+		output+="Packages matching the expression '""$expression""' can be upgraded: \n"
+		output+="$matching_packages\n\n"
+	fi
+done
+
+if [ -n "$output" ]; then
+	output="The Apt Update Watcher has been triggered.\n\n""$output"
+
+    echo -e "$output" # Can be replaced by anything or piped into sendmail
+fi