From 40ed5b0437aaba3f5150cb9e524a101558de8e18 Mon Sep 17 00:00:00 2001
From: Jeremy Dubois <jdubois@evolix.fr>
Date: Thu, 31 Mar 2022 10:07:40 +0200
Subject: [PATCH] nagios-nrpe : handle the case where cached_mem is in GB to
 convert it in MB in check_free_mem.sh

---
 CHANGELOG                                                | 1 +
 .../templates/plugins_bsd/check_free_mem.sh.j2           | 9 ++++++++-
 2 files changed, 9 insertions(+), 1 deletion(-)

diff --git a/CHANGELOG b/CHANGELOG
index d31e01f..d494b0a 100644
--- a/CHANGELOG
+++ b/CHANGELOG
@@ -21,6 +21,7 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 ### Fixed
 
 - base: fix shell configuration, increase $HISTSIZE, and change history alias so it displays full history
+- nagios-nrpe : handle the case where cached_mem is in GB to convert it in MB in check_free_mem.sh
 
 ### Removed
 
diff --git a/roles/nagios-nrpe/templates/plugins_bsd/check_free_mem.sh.j2 b/roles/nagios-nrpe/templates/plugins_bsd/check_free_mem.sh.j2
index fff81b5..8215374 100755
--- a/roles/nagios-nrpe/templates/plugins_bsd/check_free_mem.sh.j2
+++ b/roles/nagios-nrpe/templates/plugins_bsd/check_free_mem.sh.j2
@@ -67,7 +67,14 @@ tot_mem=$(( `/sbin/sysctl -n hw.physmem` / BYTES_IN_MB))
 {% if ansible_distribution_version is version_compare("6.2",'<') %}
 free_mem=$(( `/usr/bin/vmstat | /usr/bin/tail -1 | /usr/bin/awk '{ print $5 }'` / KB_IN_MB ))
 {% else %}
-free_mem=$(($(/usr/bin/vmstat | /usr/bin/tail -1 | /usr/bin/awk '{ print $4 }' | tr -d 'M') + $(top -n | grep Memory | awk '{print $8}' | tr -d 'M')))
+if [ "$(top -n | grep Memory | awk '{print $8}' | tr -d 'M')" == "$(top -n | grep Memory | awk '{print $8}' | tr -d 'G')G" ]; then
+    # If cached_mem = XG then cached_mem = X*1024M
+    cached_mem=$(($(top -n | grep Memory | awk '{print $8}' | tr -d 'G') * 1024))
+else
+    # Else, cached_mem = XM
+    cached_mem=$(top -n | grep Memory | awk '{print $8}' | tr -d 'M')
+fi
+free_mem=$(($(/usr/bin/vmstat | /usr/bin/tail -1 | /usr/bin/awk '{ print $4 }' | tr -d 'M') + $cached_mem))
 {% endif %}
 # Free memory size (in percentage)
 free_mem_perc=$(( free_mem * 100 / tot_mem ))