Fakeroot like behavior for mounts inside a fuse2fs mounted filesystem

[ruanformigoni]

Hello there,

I'm currently experiencing an issue, I can use this command:

$ fuse2fs -ofakeroot focal.img mnt

To mount a filesystem in the mnt folder, I can also do chown root:root mnt/some-folder without root privileges, however, I cannot mount subsystems in the mnt mountpoint without the allow_other fuse option, which is not enabled by default.

Example:

# When inside `mnt/test` which has `alpine.img` and the `mnt2` empty folder
$ fuse2fs -ofakeroot alpine.img mnt2
fusermount: bad mount point /home/.../mnt/test/mnt2: Permission denied

Would it be possible to circumvent this issue by expanding upon the current implementation of fakeroot?