rewritten disk usage script part

disks_checks.sh

@@ -1,38 +1,50 @@
 #!/bin/bash
 
-### I lost the link where I copied the first part of this script from, sorry, i'll update as soon as I find it back! The btrfs raid1 check part (second) and the btrfs device errors part (third) are written by tech_at_hangar.org
+### the used parts of this scrits have been written by tech_at_hangar.org
 
-## The first part of this script checks for given minimum space on a mounted volume, and alerts ntfy in case the limit is surpassed.
+## This unused part of this script checks for given minimum space on a mounted volume, and alerts ntfy in case the limit is surpassed. it stays here as a reference only. I copied the script from internet but I lost the reference, sorry!
+
+## root volume 
+#mingigs=10
+#avail=$(df | awk '$6 == "/" && $4 < '$mingigs' * 1024*1024 { print $4/1024/1024 }')
+
+#if [ -n "$avail" ]; then
+#  curl -k --retry 3 \
+#    -d "Only $avail GB available on the root disk. Better clean that up." \
+#    -H "Title: Low disk space alert on $(hostname)" \
+#    -H "Priority: default" \
+#    -H "Tags: warning,cd" \
+#    $topicurl
+#fi
+
+## The first part of this script checks for disk usage and alerts if it exceeds 94%
 ## The second part of this script checks for missing disks on btrfs raid1 devices and alerts ntfy in case of missing devices
 ## The third part of this script checks for read/write errors on disks in mounted partitions and alerts ntfy in case of errors
 
-# root volume 
-mingigs=10
-avail=$(df | awk '$6 == "/" && $4 < '$mingigs' * 1024*1024 { print $4/1024/1024 }')
+# the ntfy instance where you are senfing alerts to:
 topicurl=https://NTFY_SERVER_IP/disk_alerts
 
-if [ -n "$avail" ]; then
-  curl -k --retry 3 \
-    -d "Only $avail GB available on the root disk. Better clean that up." \
-    -H "Title: Low disk space alert on $(hostname)" \
-    -H "Priority: default" \
-    -H "Tags: warning,cd" \
-    $topicurl
-fi
 
-# OTHER VOLUME NAME
-mingigs=500
-avail=$(df | awk '$6 == "/mnt/OTHER_VOLUME" && $4 < '$mingigs' * 1024*1024 { print $4/1024/1024 }')
-topicurl=https://NTFY_SERVER_IP/disk_alerts
+### check disk usage status and notify if more then 95% is in use
+
+# print every /dev/ disk mounted, write all results in a single line, separated by commas and remove last comma
+mounted_partitions="$(df | awk '{print $1}' | grep '/dev/' | tr '\n' ',' | awk '{sub(/,$/,""); print}')"
+
+for i in ${mounted_partitions//,/ }
+do
+        # df on every mounted disk detected, take the 5th column, remove the % symbol, and output only the second line
+        disk_occupation=$(df $i | awk '{print $5}' | tail -n+2 | sed 's/.$//')
+
+        if [ ${disk_occupation} -gt 95 ] ; then
+		curl -k --retry 3 \
+		-d "Less then 5% space available on the $i partition. Better clean that up." \
+    		-H "Title: Low disk space alert on $(hostname)" \
+    		-H "Priority: default" \
+    		-H "Tags: warning,cd" \
+    		$topicurl
+        fi
+done
 
-if [ -n "$avail" ]; then
-  curl -k --retry 3 \
-    -d "Only $avail GB available on the /mnt/OTHER_VOLUME disk. Better clean that up." \
-    -H "Title: Low disk space alert on $(hostname)" \
-    -H "Priority: default" \
-    -H "Tags: warning,cd" \
-    $topicurl
-fi
 
 ### check btrfs raid status on btrfs devices
 
@@ -49,11 +61,10 @@ fi
 
 ### check errors on btrfs devices
 
-topicurl=https://NTFY_SERVER_IP/disk_alerts
 # get list of btrfs mounted partition, put all results in a single line separated by a comma and remove the last comma
-mounted_partitions="$(mount | grep btrfs | awk '{print $3}' |  tr '\n' ',' | awk '{sub(/,$/,""); print}')"
+mounted_btrfs_partitions="$(mount | grep btrfs | awk '{print $3}' |  tr '\n' ',' | awk '{sub(/,$/,""); print}')"
 
-for i in ${mounted_partitions//,/ }
+for i in ${mounted_btrfs_partitions//,/ }
 do
 	# check btrfs errors on mounted device, if all output is 0 then return a single "1"
 	check_disk_errors=$(btrfs device stats $i | awk '{print $2}' | grep -c 0 -v)