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;; This is an operating system configuration file for a fairly minimal
;; "desktop" setup with i3 where the /home partition partition is
;; encrypted with LUKS.
;;
;; https://guix.gnu.org/manual/en/html_node/operating_002dsystem-Reference.html
(define-module (tw system lap)
#:use-module (gnu)
#:use-module (gnu bootloader grub)
#:use-module (gnu packages linux)
#:use-module (gnu packages shells)
#:use-module (gnu services admin)
#:use-module (gnu services desktop)
#:use-module (gnu services pm)
#:use-module (gnu services shepherd)
#:use-module (gnu services syncthing)
#:use-module (gnu system locale)
#:use-module (gnu system nss)
#:use-module (guix gexp)
#:use-module (guix packages)
#:use-module ((guix utils)
#:select (substitute-keyword-arguments))
#:use-module ((nongnu packages linux)
#:prefix nongnu:) ; don't interfere with (gnu packages linux)
#:use-module ((nongnu packages nvidia)
#:prefix nongnu:)
#:use-module ((nongnu services nvidia)
#:prefix nongnu:)
#:use-module ((nongnu system linux-initrd)
#:prefix nongnu:)
#:use-module (nonguix licenses)
#:use-module (tw channels)
#:use-module (tw services secrets)
#:use-module (tw system))
(define efi-system-partition ; /dev/nvme0n1p1
(uuid "E04A-DF05" 'fat))
(define tilearch-root-partition ; /dev/nvme0n1p2
(uuid "197c7f98-c780-4017-9bf7-212175967fd0" 'btrfs))
(define guixsd-root-partition ; /dev/nvme0n1p3
(uuid "2169a07b-b7b6-4e3d-8e59-bf00d0baffc4" 'btrfs))
(define swap-partition ; /dev/nvme0n1p4
(uuid "2c78d507-5cd1-48da-ba8d-d1b01d6ff8f9"))
(define data-partition-outside-luks ; /dev/sda1
(uuid "43108ff6-b25a-4a53-b3f7-6d03ff3e0022"))
(define data-partition-inside-luks ; /dev/mapper/data
(uuid "826bb1a7-1069-46a5-897a-afa19272fbb0" 'btrfs))
(define-public %lap-system
(operating-system
(host-name "lap.twilken.net")
(timezone "Europe/Paris")
(locale "en_GB.utf8")
(locale-definitions
(list (locale-definition (name "en_GB.utf8") (source "en_GB"))
(locale-definition (name "en_US.utf8") (source "en_US"))
(locale-definition (name "fr_FR.utf8") (source "fr_FR"))))
;; Allow resolution of '.local' host names with mDNS.
(name-service-switch %mdns-host-lookup-nss)
;; Choose UK English X11 keyboard layout.
(keyboard-layout %british-keyboard)
;; Use the UEFI variant of GRUB with the EFI System
;; Partition mounted on /boot/efi.
(bootloader
(bootloader-configuration
(bootloader grub-efi-bootloader)
(targets '("/boot/efi"))
;; Note: keyboard-layout is ignored by non-grub bootloaders.
(keyboard-layout keyboard-layout)
(menu-entries
(list
(menu-entry
(label "systemd-boot")
(device efi-system-partition)
(chain-loader "/EFI/systemd/systemd-bootx64.efi"))))))
;; Use non-free kernel to load non-free firmware (e.g. for wifi).
(kernel nongnu:linux-lts)
(kernel-arguments
(cons* ;;"nosplash"
;;"vt.global_cursor_default=0"
;;"video.use_native_backlight=1"
;; Needed for PRIME synchronization:
;; https://wiki.archlinux.org/title/PRIME#PRIME_synchronization
;; https://wiki.archlinux.org/title/NVIDIA#DRM_kernel_mode_setting
"nvidia-drm.modeset=1"
;;"acpi_osi=\"!Windows 2015\""
;;"acpi_enforce_resources=lax"
"modprobe.blacklist=nouveau" ; prevent interference with nvidia
%default-kernel-arguments))
(kernel-loadable-modules (list ddcci-driver-linux))
(initrd nongnu:microcode-initrd)
(firmware (cons* nongnu:atheros-firmware ; for atk10k/QCA6174/hw3.0 (wifi card)
nongnu:i915-firmware ; for Intel GPU runtime power management etc
%base-firmware))
;; Specify a mapped device for the encrypted home partition.
;; The UUID is that returned by 'cryptsetup luksUUID'.
(mapped-devices
(list (mapped-device
(source data-partition-outside-luks)
(target "data")
(type luks-device-mapping))))
(swap-devices
(list (swap-space
(target swap-partition)
(discard? #t))))
(file-systems
(cons* (file-system
(device guixsd-root-partition)
(mount-point "/")
(flags '(no-atime))
(options (alist->file-system-options
'("ssd" ("compress" . "zstd"))))
(type "btrfs"))
(file-system
(device efi-system-partition)
(mount-point "/boot/efi")
(flags '(no-atime))
(type "vfat"))
(file-system
(device data-partition-inside-luks)
(mount-point "/home")
(flags '(no-atime))
(options (alist->file-system-options
'("ssd" ("compress" . "zstd")
("subvol" . "home/guixsd"))))
(type "btrfs")
(dependencies mapped-devices))
%base-file-systems))
;; Members of the wheel group are allowed to use sudo.
(users (cons* (user-account
(name "timo")
(comment "Timo Wilken")
(group "users")
(supplementary-groups
'("wheel" "audio" "video" "docker" "adbusers"))
(shell (file-append zsh "/bin/zsh")))
%base-user-accounts))
(sudoers-file
(plain-file "sudoers"
(string-append
;; We need to preserve $TERMINFO so that programs under sudo can
;; find kitty's terminfo files. This is possibly unsafe; sudo
;; explicitly deletes this variable by default.
"Defaults env_keep += \"TERMINFO\"\n"
(plain-file-content %sudoers-specification)
;; In addition to the default rules, allow admins to power off
;; the computer. They'll have to use the system binaries, not
;; those from their user profile, as /etc/sudoers requires
;; absolute paths to commands.
"%wheel ALL=(ALL) NOPASSWD: "
"/run/current-system/profile/sbin/halt, "
"/run/current-system/profile/sbin/reboot, "
"/run/current-system/profile/sbin/shutdown\n")))
;; This is where we specify system-wide packages.
(packages
;; Proprietary NVIDIA driver. See its description for more required setup steps.
(cons* nongnu:nvidia-driver %enduser-system-packages))
;; Use the "desktop" services, which include the X11
;; log-in service, networking with NetworkManager, and more.
;; See info '(guix)Services' for useful services.
(services
(cons*
(service syncthing-service-type
(syncthing-configuration
(user "timo")))
(service bluetooth-service-type)
(service tlp-service-type) ; TODO: configure properly
;; Disabled as it doesn't work with my hardware.
;; It always says "logging in with fingerprint failed" and blocks password login in gdm.
;; (service fprintd-service-type)
(service nongnu:nvidia-service-type) ; proprietary nvidia driver
;; For some reason, none of the NVIDIA things create this device file
;; automatically, even though the NVIDIA Xorg driver requires it (Xorg
;; fails to start otherwise).
(simple-service 'create-nvidiactl shepherd-root-service-type
(list
(shepherd-service
(documentation "Create /dev/nvidiactl.")
(provision '(nvidiactl))
(requirement '(nvidia))
(one-shot? #t)
(start #~(make-forkexec-constructor
(list #$(file-append coreutils "/bin/mknod")
"-m" "666" "/dev/nvidiactl" "c" "195" "255")))
(stop #~(make-forkexec-constructor
(list #$(file-append coreutils "/bin/rm")
"-f" "/dev/nvidiactl"))))))
(service unattended-upgrade-service-type
(unattended-upgrade-configuration
(schedule "0 21 * * *") ; every night at 21:00, when the laptop is turned on
(maximum-duration (* 40 60)) ; 40 minutes to allow for slow downloads
(channels %system-channels)
(operating-system-expression
#~(@ (tw system lap) %lap-system))
(services-to-restart
;; Anything that won't cause disruption when restarting.
'(syncthing-timo earlyoom thermald tlp wireguard-wg0 mcron))))
;; Set up a secrets config for WireGuard to extend.
(service secrets-service-type
(secrets-configuration
;; TODO: reencrypt for SSH key.
(host-key "/etc/secrets.key"))) ; we have no SSH host keys, so use a custom key
(enduser-system-services
#:host-name host-name
#:cores 8
#:wireless-interface "wlp3s0"
#:backlight-device "intel_backlight"
#:xorg-extra-modules (list nongnu:nvidia-driver)
;; TODO: run acpid so nvidia driver can connect?
;; See `guix show nvidia-driver'
#:xorg-drivers '("nvidia" "modesetting"))))))
%lap-system
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