Update Readme

add requirements.yml for additional modules

roles/zabbix/files/check_updates.sh

@@ -0,0 +1,96 @@
+#!/usr/bin/env bash
+# From https://github.com/kvz/bash3boilerplate
+# Require at least bash 3.x
+if [[ "${BASH_VERSINFO[0]}" -lt "3" ]]; then echo "bash version < 3"; exit 1; fi
+
+# Exit on error. Append || true if you expect an error.
+set -o errexit
+set -o nounset
+
+# Bash will remember and return the highest exit code in a chain of pipes.
+set -o pipefail
+
+PATH=/bin:/sbin:/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/root/bin
+
+timestamp_file="/run/zabbix/caendra_check_update"
+update_interval="86400" # 1 day
+timestamp_file_mtime="0"
+os=""
+epoch=$(date "+%s")
+tmpfile=$( mktemp --tmpdir=/run/zabbix )    
+outfile="/run/zabbix/zabbix.count.updates"
+
+function _detectOS {
+    if [[ -e /etc/centos-release ]]; then
+        export os="centos"
+    fi
+    if [[ -e /etc/debian_version ]]; then
+        export os="debian"
+    fi
+}
+
+function _check_last_update {
+    if [[ ! -e $timestamp_file ]]; then 
+        export update_needed=y
+        touch $timestamp_file
+    else
+        timestamp_file_mtime=$(stat -c %Y $timestamp_file )
+    fi
+
+    if [[ "$((epoch-timestamp_file_mtime))" -gt "$update_interval" ]]; then 
+        export update_needed=y
+    else
+        export update_needed=n
+    fi
+}
+
+
+function _check_OS_upgrades {
+    if [[ "$os" == "debian" ]]; then 
+        if [[ "$update_needed" == "y" ]]; then
+            apt update &>/dev/null
+            touch $timestamp_file
+        fi
+
+        pkg_to_update=$((apt-get upgrade --simulate 2>&1 | wc -l) || true)
+	pkg_to_update=$((pkg_to_update-5))
+    fi
+
+if [[ "$os" == "centos" ]]; then
+        if [[ ! -e /var/cache/yum/x86_64/7/base/repomd.xml ]]; then
+            # if the repomd.xml file does not exists,
+            # we assume that this is a new machine 
+            # or "yum clean all" was run
+            export update_needed="y"
+        fi
+
+        if [[ "$update_needed" == "y" ]]; then
+            # forced true as the --assumeno option 
+            # always returns exit code 1
+            yum upgrade --assumeno &> /dev/null || true
+            touch $timestamp_file
+        fi
+
+        yum_output=$(yum check-update --cacheonly && rc=$? || rc=$?; echo "rc=$rc" > $tmpfile)
+        source $tmpfile
+        rm $tmpfile
+
+        if [[ "$rc" == "0" ]]; then
+            pkg_to_update="0"
+        fi
+
+         if [[ "$rc" == "100" ]]; then
+            pkg_to_update=$(echo "$yum_output" | egrep -v '^(Load| \*|$)' | wc -l)
+        fi
+    fi
+}
+
+
+_detectOS
+_check_last_update
+
+pkg_to_update=""
+
+_check_OS_upgrades
+
+echo "$pkg_to_update" > $outfile