I am working on a lab for my linux class and the teacher is teaching us about Systemd.

How do I create a service that starts a script when a specific device is mounted using this command: mount /dev/xvdc1 /mnt/backup

What I have tried

1. Using a Timer I checked if /mnt/backup was a mount point. (teacher would not accept it. It must be strictly event driven)
2. Creating a .mount unit and making the .service unit require the .mount unit. This approach did not start the script when executing the command: mount /dev/xvdc1 /mnt/backup

I think I may be approaching this problem the wrong way. This is the lab problem.

"Create a unit file that copies all the files from /mnt/backup using rsync as soon as /dev/xvdc1 is mounted."

What I know:

1. The device that will be mounted will always be /dev/xvdc1
2. The mount point of the device will always be /mnt/backup
3. The Service must be started based on /dev/xvdc1 being mounted

Here is my .service unit file

[Unit]
Description=Starts a backup for /dev/xvdc1 when mounted using the mount command.

[Service]
Type=simple
ExecStart=/root/backupscript.sh
ExecStop=/bin/kill -HUP $MAINPID

[Install]
WantedBy=multi-user.target