Add initial work system and home declarations

These are based on the ones for my laptop, so especially the PIM services
contain some reference to personal accounts, but no passwords at least.

1 files changed, 243 insertions, 0 deletions

diff --git a/tw/system/cern.scm b/tw/system/cern.scm
new file mode 100644
index 00000000..76cae0bf
--- /dev/null
+++ b/tw/system/cern.scm
@@ -0,0 +1,243 @@
+;; 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 cern)
+  #:use-module (gnu)
+  #:use-module (gnu bootloader grub)
+  #:use-module (gnu system locale)
+  #:use-module (gnu system nss)
+  #:use-module (guix gexp)
+  #:use-module (guix packages)
+  #:use-module (tw system))
+
+(use-package-modules certs cups disk docker file-systems gnome kerberos linux
+                     mtools pulseaudio search shells wm xorg)
+
+(use-service-modules admin authentication avahi base cups dbus desktop docker
+                     kerberos linux mcron networking pm ssh syncthing vpn xorg)
+
+(define efi-system-partition          ; /dev/nvme0n1p1
+  (uuid "806A-2762" 'fat))
+(define arch-root-partition           ; /dev/nvme0n1p2
+  (uuid "2c21b2c0-090e-4127-92fc-e83c589120f4" 'btrfs))
+(define guixsd-root-partition         ; /dev/nvme0n1p4 -> 3
+  (uuid "2c21b2c0-090e-4127-92fc-e83c589120f4" 'btrfs))
+(define swap-partition                ; /dev/nvme0n1p3 -> 4
+  (uuid "53559d6c-bf62-4cf6-991a-6dce6dd1dc64"))
+
+(define custom-xorg-config
+  (xorg-configuration
+   (keyboard-layout %british-keyboard)))
+
+(define-public %cern-system
+  (operating-system
+    (host-name "twilkendesktop.cern.ch")
+    (timezone "Europe/Zurich")
+    (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"))))))
+
+    (kernel linux-libre)
+
+    (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"))
+            %base-file-systems))
+
+    ;; Members of the wheel group are allowed to use sudo.
+    (users (cons* (user-account
+                   (name "twilken")
+                   (comment "Timo Wilken")
+                   (group "users")
+                   (supplementary-groups
+                    '("wheel" "audio" "video" "docker"))
+                   (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
+     (cons*
+      ;; System stuff
+      cups docker mit-krb5
+      ;; Desktop and drivers
+      ;; FIXME: lightdm depends on python-2, but the build throws an
+      ;; error that python2 is not supported.
+      ;; TODO: Does lightdm have a service I need to enable?
+      ;;lightdm lightdm-gtk-greeter
+      pulseaudio xf86-video-intel
+      ;; Adds /sys/class/backlight entries for external monitors.
+      ;; Not needed for laptop display.
+      ;; ddcci-driver-linux
+      i3-gaps  ; install i3 here so gdm can see its xsession file
+      i3lock   ; we need a system service to make i3lock setuid root
+      ;; We need to install gnome-keyring here so its PAM module is
+      ;; enabled properly (by its service; see below).
+      ;; nheko needs gnome-keyring to store secrets (kwallet doesn't do dbus).
+      gnome-keyring
+      ;; It's probably easiest to install geoclue system-wide, so it
+      ;; gets added to `%desktop-services' and redshift can access the
+      ;; location.
+      geoclue
+      ;; Base packages
+      %base-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 cups-service-type
+        (cups-configuration
+         (web-interface? #t)
+         (default-shared? #f)
+         ;; See info '(guix)Printing Services' for more extensions.
+         (extensions
+          (list cups-filters foomatic-filters))))
+
+      (bluetooth-service)
+
+      (service docker-service-type
+        (docker-configuration))
+
+      (service krb5-service-type
+        (krb5-configuration
+         (default-realm "CERN.CH")
+         (rdns? #f)
+         (realms (list (krb5-realm
+                        (name "CERN.CH")
+                        (default-domain "cern.ch")
+                        (kdc "cerndc.cern.ch"))))))
+
+      (service thermald-service-type
+        (thermald-configuration
+         (adaptive? #t)))
+
+      (service earlyoom-service-type
+        (earlyoom-configuration))  ; TODO: configure at least `avoid-regexp'
+
+      ;; Install i3lock as a setuid binary, so it can talk to PAM.
+      (screen-locker-service i3lock "i3lock")
+
+      ;; gnome-keyring is not in `%desktop-services' by default,
+      ;; but needs to be there to add itself to /etc/pam.d/.
+      ;; If using a DM other than GDM, add it to `pam-services' in
+      ;; `gnome-keyring-configuration' (see its docs).
+      (service gnome-keyring-service-type
+        (gnome-keyring-configuration))
+
+      (set-xorg-configuration custom-xorg-config)
+
+      (service unattended-upgrade-service-type
+        (unattended-upgrade-configuration
+         (schedule "0 21 * * *")   ; every night at 22:00
+         (maximum-duration (* 40 60))   ; 40 minutes
+         (operating-system-expression
+          #~(begin
+              (set! %load-path (cons "/home/timo/src/guix-decls" %load-path))
+              (@ (tw system lap) %lap-system)))
+         (services-to-restart
+          ;; Anything that won't cause disruption when restarting.
+          '(syncthing-timo earlyoom thermald tlp wireguard-wg0 mcron))))
+
+      (simple-service 'disk-maintenance mcron-service-type
+        ;; I don't think jobs run on boot if they would have run when the
+        ;; computer was turned off, so choose a time when the computer is
+        ;; probably turned on.
+        (list #~(job "45 22 * * *" "guix gc -d 2w -F 25G")  ; after unattended-upgrade
+              #~(job "0 23 * * *"  ; after guix gc
+                     (string-append #$(file-append util-linux "/sbin/fstrim")
+                                    " --fstab --verbose"))))
+
+      (service openssh-service-type
+        (openssh-configuration
+         (port-number 22022)
+         (x11-forwarding? #t)
+         (permit-root-login #f)
+         (password-authentication? #f)
+         (authorized-keys
+          `(("twilken" ,(local-file "files/timo-cern.pub"))))))
+
+      (modify-services %desktop-services
+        (gdm-service-type
+         config =>
+         (gdm-configuration
+          (inherit config)
+          (auto-login? #f)
+          (default-user "twilken")
+          (xorg-configuration custom-xorg-config)))
+
+        (geoclue-service-type
+         config =>
+         (geoclue-configuration
+          (inherit config)
+          (applications
+           (cons* (geoclue-application "redshift" #:system? #f)
+                  %standard-geoclue-applications))))
+
+        (login-service-type
+         config =>
+         (login-configuration
+          (inherit config)
+          (motd (plain-file "no-motd" ""))
+          (allow-empty-passwords? #f))))))))
+
+%cern-system