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Re: Some methods of getting a "login shell" do not create /run/user/<uid
From: |
Skyler Ferris |
Subject: |
Re: Some methods of getting a "login shell" do not create /run/user/<uid> or add a session to loginctl |
Date: |
Fri, 05 Jan 2024 19:39:28 +0000 |
On 12/30/23 04:45, Ben Weinstein-Raun wrote:
> Does anyone know why this would happen, or how to fix it? I'm using the
> elogind service on top of %base-services.
>
I was hoping that someone else more knowledgeable might have a better
solution, but since nobody has replied I'll share the less-than-ideal
solution I've been using. I use a system without elogind, so I'm not
sure if there would be a conflict with this setup and that service.
Also, this solution does not properly destroy the directory when a user
fully logs out, only when the system is rebooted.
Basically, I just use some code to mount tmpfs onto the directories by
adding extra values to the file-systems declaration of my
operating-system declaration. The main disadvantage not already
mentioned is that UIDs and GIDs have to be explicitly defined for each
non-system user. Maybe the logic for the GIDs could be removed because
the group has no permissions on the directory anyway, but I haven't
thought it through.. There are some helper functions:
(let*
((get-gid-by-name (lambda (name groups)
(let ((matches (filter (lambda (group) (string=?
(guix.user-group-name group)) name)
groups)))
(if (>= (length matches) 1)
(guix.user-group-id (car matches))
(error (string-append "The group " name " must have an
explicitly defined GID!"
" Add a (gid <number>) form to
the group definition."))))))
(get-user-gid (lambda (user groups)
(unless (guix.user-account-group user)
(error (string-append "The user " (guix.user-account-name
user)
" must have an explicitly defined
group! Add"
" (group <name|number>) to the user
definition.")))
(let ((gid (if (number? (guix.user-account-group user))
(guix.user-account-group user)
(get-gid-by-name (guix.user-account-group user)
groups))))
(number->string gid))))
(get-user-uid (lambda (user)
(unless (guix.user-account-uid user)
(error (string-append "The user " (guix.user-account-name
user)
" must have an explicitly defined
UID! Add (uid <number>) to"
" the user definition.")))
(number->string (guix.user-account-uid user)))))
Which can then be used to create the filesystems:
(map (lambda (user)
(let ((uid (get-user-uid user))
(gid (get-user-gid user groups)))
(guix.file-system
; I don't know if this is normally a tmpfs,
but the XDG basedir standard
; says that it MUST not survive a reboot,
so being tmpfs shouldn't cause any
; problems. This is technically not
compliant because it also says that the
; contents MUST be removed if the user
fully logs out (implicitly, even if
; the system remains powered on) and I'm
not doing that. It looks like guix
; has a predefined greetd configuration to
handle this correctly.
(device "tmpfs")
(mount-point (string-append
"/run/user/" uid))
(type "tmpfs")
(check? #f)
(options (format #f
"mode=0700,uid=~a,gid=~a" uid gid))
(create-mount-point? #t))))
(filter (negate guix.user-account-system?) users)))))
Regards,
Skyler
- Re: Some methods of getting a "login shell" do not create /run/user/<uid> or add a session to loginctl,
Skyler Ferris <=