Nuke inodes on: /dev/md0 partition (Synology) if capacity >= 90%.

inode_eraser.sh

#!/usr/bin/env bash
#
# inode_eraser
#
# Nuke inodes on: /dev/md0 partition (Synology) if capacity >= 90%.
# Place file in: /usr/local/bin. 
# Set permisisons: chmod 644.
# Set cronjob by editing: /etc/crontab, & restart service: systemctl restart crond
#
# Author: M. Krinitz <mjk235 [at] nyu [dot] edu>
# Date: 02-Jul-2023
# License: MIT

timestamp=$(date "+%b %d %X")
inode_percentage=$(df -i | awk 'NR==2 {sub(/%/, "", $5); print $5}')
threshold=90
inode_scrub_command="/var/packages/SecureSignIn/target/tool/updater -v 240"
end='exit 1'

root_check() {

	if [ "$EUID" -ne "0" ] ; then
		printf "%s\n" "ERROR: Root privileges are required to continue. Exiting."
        $end
	fi
}

inode_comparison_check() {

    if [ "$inode_percentage" -ge $threshold ]; then
        printf "%s\n" "Inode usage: HIGH ($inode_percentage%). Continuing..."

    else
        printf "%s\n" "Inode usage: LOW ($inode_percentage%). Exiting."
        $end
	fi
}

inode_scrub() {

    printf "%s\n" "Running inode scrub command. Please hold..."

	if ! output=$($inode_scrub_command 2>&1); then
		printf "%s\n" "Error: Inode scrub command failed. Details.: $output"
		$end
	fi
}

exit_status() {

  print $retVal

  if [[ $retVal -ne 0 ]]; then
    printf "%s\n" "ACHTUNG!!! Something went wrong, homie."

  else
    printf "%s\n" "Done. Exiting @ $timestamp."

	fi
}

main() {

    root_check
    inode_comparison_check
    inode_scrub
}

main "$@"

retVal=$?
exit_status