I was able to set up a unionfs path but realized I wanted to change it. I can't seem to overwrite, unmount, or move the unionfs target directory. Is there a command that a non-root user (who set up the union) to change it?
myuser@maven ~ $ unionfs \
-o cow \
-o statfs_omit_ro \
/home/myuser/files/pre-upload:/home/myuser/gd-media=RO \
/home/myuser/union-media
fuse: mountpoint is not empty fuse: if you are sure this is safe, use the 'nonempty' mount option
myuser@maven ~ $ umount /home/myuser/union-media
umount: /home/myuser/union-media: Permission denied
myuser@maven ~ $ mv union-media OLD-union-media
mv: cannot move 'union-media' to 'OLD-union-media': Device or resource busy