#+TITLE: GUIX System Configuration
#+AUTHOR: Daniel Ziltener
#+PROPERTY: header-args:scheme :comments both

#+begin_src emacs-lisp :results none
  (org-babel-lob-ingest "./library.org")
#+end_src

* Modules

#+NAME: module-list
- gnu
- gnu services base
- gnu services dbus
- gnu services desktop
- gnu services linux
- gnu services networking
- gnu services pm
- gnu services virtualization
- gnu services xorg
- gnu system nss

#+begin_src scheme :noweb yes :exports none :results code :tangle config.scm
  <<list-to-use(use-call="use-modules",entries=module-list)>>
#+end_src

** Service Modules

#+NAME: service-module-list
- desktop
- xorg

#+begin_src scheme :noweb yes :exports none :results code :tangle config.scm
  <<list-to-use(use-call="use-service-modules",entries=service-module-list)>>
#+end_src

**  Package Modules

#+NAME: package-module-list
- bootloaders
- certs
- emacs
- emacs-xyz
- fonts
- readline
- terminals
- version-control
- wm
- xorg

#+begin_src scheme :noweb yes :exports none :results code :tangle config.scm
  <<list-to-use(use-call="use-package-modules",entries=package-module-list)>>
#+end_src

* Configuration Definitions

** File System

The variable ~%local-filesystem~ extracts the file system definitions from the installer-provided
=config.scm= file.

#+begin_src scheme :tangle config.scm
  (define %local-filesystem
    (call-with-input-file "/etc/config.scm"
      (lambda (port)
        (read port)
        (read port)
        (eval (cadar (last-pair (read port)))
              (interaction-environment)))))
#+end_src

As a sibling to the former, the variable ~%local-swap~ does the same with the swap partition.

#+begin_src scheme :tangle config.scm
  (define %local-swap
    (call-with-input-file "/etc/config.scm"
      (lambda (port)
        (read port)
        (read port)
        (let* ((os-list (read port))
               (os-list-length (length os-list)))
          (eval
           (cdr
            (list-ref os-list
                      (- os-list-length 2)))
           (interaction-environment))))))
#+end_src

** Packages

#+NAME: root-packages
- emacs
- emacs-desktop-environment
- font-terminus
- git
- nss-certs
- readline
- swayfx

#+NAME: root-package-block
#+begin_src scheme :noweb no-export
  (packages
   (append
    <<org-to-scheme-sym-list(input=root-packages)>>
    %base-packages))
#+end_src

** Services

#+NAME: root-services-block
#+begin_src scheme :noweb yes :exports none :results code
  (services
   (append
    (modify-services
     %desktop-services
     (delete login-service-type)
     (delete mingetty-service-type)
     (delete console-font-service-type))
    <<root-simple-service-block>>
    <<greeter-service>>
    <<screen-lock-service>>
    ))
#+end_src

*** Simple Services

These services are unmodified, or have just few settings.

#+NAME: root-simple-services
| Service     | Options                                              |
|-------------+------------------------------------------------------|
| tlp         | ()                                                   |
| thermald    | ((adaptive? t))                                      |
| bluetooth   | ()                                                   |
| earlyoom    | ((minimum-available-memory 5) (minimum-free-swap 5)) |
| inputattach | ()                                                   |
| libvirt     | ((unix-sock-group "libvirt"))                        |
| fstrim      | ()                                                   |
| fprintd     | ()                                                   |

#+NAME: root-simple-service-block
#+begin_src scheme :noweb yes :exports none :results code
  <<service-converter(input=root-simple-services)>>
#+end_src

*** Greeter Service

=greetd= is a broken mess, yet here we are.

#+NAME: greeter-service
#+begin_src scheme
  (service greetd-service-type
           (greetd-configuration
            (greeter-supplementary-groups
             (list "video" "input"))
            (terminals
             (list
              (greetd-terminal-configuration
               (terminal-vt "7")
               (terminal-switch #t)
               (default-session-command
                 (greetd-wlgreet-session
                  (command
                   (file-append swayfx "/bin/sway")))))
              (greetd-terminal-configuration
               (terminal-vt "8"))))))
#+end_src

*** Screen Locker Service

For some reason, this service runs on root level for Guix.

#+NAME: screen-lock-service
#+begin_src scheme
  (service screen-locker-service-type
           (screen-locker-configuration
            (name "swaylock")
            (program
             (file-append swaylock-effects "/bin/swaylock"))
            (using-setuid? #f)))
#+end_src

* Operating System

This is the full operating system specification.

#+begin_src scheme :noweb no-export :results code :tangle config.scm
  (operating-system
   (host-name "ziltis-machine")
   (timezone "Europe/Berlin")
   (locale "de_DE.utf8")
   (keyboard-layout
    (keyboard-layout "de" #:options '("caps:swapescape")))
   (bootloader
    (bootloader-configuration
     (bootloader grup-efi-bootloader)
     (targets
      '("/boot/efi"))
     (keyboard-layout keyboard-layout)))
   (file-systems %local-filesystem)
   (swap-devices %local-swap)
   (users
    (cons*
     (user-account
      (name "zilti")
      (group "users")
      (supplementary-groups
       '("wheel" "netdev" "audio" "video" "libvirt")))
     %base-user-accounts))
    <<root-package-block>>
    <<root-services-block>>
   (name-service-switch %mdns-host-lookup-nss))
#+end_src