Hello everybody,
I can't speak for Thunar or any other graphical file manager, but I
think many file managers do in some way or another support File System
in Userspace (FUSE).
I use Udisks to mount storage media without "sudo".
In my operating system definition, I add my user to the fuse group:
(users
(cons* (user-account (name "nschmidt")
(group "users")
(supplementary-groups '("fuse" "wheel")))
%base-user-accounts))
(groups
(cons* (user-group (name "fuse"))
%base-groups))
(packages
(append
(list fuse gvfs udisks)
%base-packages))
For this I had to add:
(use-service-modules desktop)
(use-package-modules freedesktop ; udisks
gnome ; gvfs
linux) ; fuse
Mounting and unmounting goes like so:
$ udisksctl mount -b /dev/sdb
Mounted /dev/sdb at /media/nschmidt/3437-6CE7.
$ udisksctl unmount -b /dev/sdb
(Use lsblk to find out the block device node path /dev/sdX.)
I am not sure if this is of any help with Thunar. Currently, I do not
have a storage medium at hand to test either.
Best regards
Niklas
