#!/bin/bash

### I lost the link where I copied this script from, sorry, i'll update as soon as I find it back! The btrfs raid1 check part is written by tech_at_hangar.org

## The first part of this script checks for given minimum space on a mounted volume, and contacts ntfy in case the limit is surpassed.
## The second part of this script checks for missing disks on btrfs raid1 devices and contacs ntfy in case of missing devices

# root volume 
mingigs=10
avail=$(df | awk '$6 == "/" && $4 < '$mingigs' * 1024*1024 { print $4/1024/1024 }')
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

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 1 status on /mnt/OTHER_VOLUME NAME

if (btrfs fi show | grep -wic "Some devices missing"); then
    echo Bad: - Btrfs is missing devices, some disk is broken
    echo Sending alert...
    curl -k --retry 3 \
    -d "Bad - Some devices are missing in btrfs: maybe a broken disk?" \
    -H "Title: Missing disks in btrfs on $(hostname)" \
    -H "Priority: high" \
    -H "Tags: warning,boar" \
    $topicurl
fi