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I want to use a systemd --user .service to map an image file to a loop device at user login. The the service resides in /etc/systemd/user. The image in question resides in /home/$USER/my.img

[Unit]
Description=Setup loop device

[Service]

ExecStart=/usr/sbin/losetup /dev/loop0 /home/john/my.img

[Install]
WantedBy=default.target

The unit fails with

losetup: /dev/loop1: failed to set up loop device: Permission denied

I understand losetup can not be called by a user. Placing the unit in /etc/systemd/system works, but accessing the file prompts the sudo password, witch i want to avoid.

How should i proceed?

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