bug#47716: gio mount broken, again.

[Maxim Cournoyer <maxim.cournoyer@gmail.com>]

Hi,

raingloom <raingloom@riseup.net> writes:

> ```
> $ gio mount sftp://whatever
> $ ls /run/user/$UID/gvfs/
> ```
> prints nothing.

Note that it seem to work if you are using the GNOME desktop.

> Same thing happens if I mount it from the Nautilus file manager.
>
> This bug has appeared before and I still have no idea how it was fixed,
> which is not great. I'll do a bisect soon. Should probably add a system
> test for it so it doesn't break again.
>
> In the meantime, if whoever fixed it the last time could look into it
> again, I'd be very thankful. Using sshfs manually works but isn't great.

gvfs is now using fusermount3, but we were only adding 'fusermount' as a
setuid-program by default.

After adding fusermount3 from fuse@3 to /run/setuid-programs, it appears
to work:

$ guix shell glib:bin gvfs dbus fuse gnome-keyring
[env] PATH=/run/setuid-programs:$PATH dbus-run-session bash
[env] gio mount sftp://some-host:2345
( prompts for credentials )
ls /run/user/1000/gvfs/sftp:host=some-host,port=2345/
bin/   dev/  gnu/   [...]

I've pushed this as commit cbdfa54c77.

Closing.

Maxim