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;;; GNU Guix --- Functional package management for GNU
;;; Copyright © 2014, 2015, 2016, 2017, 2018, 2019 Ludovic Courtès <ludo@gnu.org>
;;; Copyright © 2015 Mark H Weaver <mhw@netris.org>
;;; Copyright © 2016 Andreas Enge <andreas@enge.fr>
;;; Copyright © 2017 Marius Bakke <mbakke@fastmail.com>
;;; Copyright © 2017 Tobias Geerinckx-Rice <me@tobias.gr>
;;;
;;; This file is part of GNU Guix.
;;;
;;; GNU Guix is free software; you can redistribute it and/or modify it
;;; under the terms of the GNU General Public License as published by
;;; the Free Software Foundation; either version 3 of the License, or (at
;;; your option) any later version.
;;;
;;; GNU Guix is distributed in the hope that it will be useful, but
;;; WITHOUT ANY WARRANTY; without even the implied warranty of
;;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
;;; GNU General Public License for more details.
;;;
;;; You should have received a copy of the GNU General Public License
;;; along with GNU Guix.  If not, see <http://www.gnu.org/licenses/>.

(define-module (gnu system install)
  #:use-module (gnu)
  #:use-module (gnu system)
  #:use-module (gnu bootloader u-boot)
  #:use-module (guix gexp)
  #:use-module (guix store)
  #:use-module (guix monads)
  #:use-module ((guix packages) #:select (package-version))
  #:use-module ((guix store) #:select (%store-prefix))
  #:use-module (gnu installer)
  #:use-module (gnu services dbus)
  #:use-module (gnu services networking)
  #:use-module (gnu services shepherd)
  #:use-module (gnu services ssh)
  #:use-module (gnu packages admin)
  #:use-module (gnu packages bash)
  #:use-module (gnu packages bootloaders)
  #:use-module (gnu packages certs)
  #:use-module (gnu packages fonts)
  #:use-module (gnu packages fontutils)
  #:use-module (gnu packages guile)
  #:use-module (gnu packages linux)
  #:use-module (gnu packages ssh)
  #:use-module (gnu packages cryptsetup)
  #:use-module (gnu packages package-management)
  #:use-module (gnu packages disk)
  #:use-module (gnu packages texinfo)
  #:use-module (gnu packages compression)
  #:use-module (gnu packages nvi)
  #:use-module (ice-9 match)
  #:use-module (srfi srfi-26)
  #:export (installation-os
            a20-olinuxino-lime-installation-os
            a20-olinuxino-lime2-emmc-installation-os
            a20-olinuxino-micro-installation-os
            bananapi-m2-ultra-installation-os
            beaglebone-black-installation-os
            mx6cuboxi-installation-os
            nintendo-nes-classic-edition-installation-os
            novena-installation-os
            pine64-plus-installation-os
            pinebook-installation-os
            rk3399-puma-installation-os
            wandboard-installation-os
            os-with-u-boot))

;;; Commentary:
;;;
;;; This module provides an 'operating-system' definition for use on images
;;; for USB sticks etc., for the installation of the GNU system.
;;;
;;; Code:

\f
;;;
;;; Documentation service.
;;;

(define %installation-node-names
  ;; Translated name of the "System Installation" node of the manual.  Ideally
  ;; we'd extract it from the 'guix-manual' gettext domain, but that one is
  ;; usually not available at run time, hence this hack.
  '(("de" . "Systeminstallation")
    ("en" . "System Installation")
    ("es" . "Instalación del sistema")
    ("fr" . "Installation du système")
    ("ru" . "Установка системы")))

(define (log-to-info tty user)
  "Return a script that spawns the Info reader on the right section of the
manual."
  (program-file "log-to-info"
                #~(let* ((tty      (open-file #$(string-append "/dev/" tty)
                                              "r0+"))
                         (locale   (cadr (command-line)))
                         (language (string-take locale
                                                (string-index locale #\_)))
                         (infodir  "/run/current-system/profile/share/info")
                         (per-lang (string-append infodir "/guix." language
                                                  ".info.gz"))
                         (file     (if (file-exists? per-lang)
                                       per-lang
                                       (string-append infodir "/guix.info")))
                         (node     (or (assoc-ref '#$%installation-node-names
                                                  language)
                                       "System Installation")))
                    (redirect-port tty (current-output-port))
                    (redirect-port tty (current-error-port))
                    (redirect-port tty (current-input-port))

                    (let ((pw (getpwnam #$user)))
                      (setgid (passwd:gid pw))
                      (setuid (passwd:uid pw)))

                    ;; 'gunzip' is needed to decompress the doc.
                    (setenv "PATH" (string-append #$gzip "/bin"))

                    ;; Change this process' locale so that command-line
                    ;; arguments to 'info' are properly encoded.
                    (catch #t
                      (lambda ()
                        (setlocale LC_ALL locale)
                        (setenv "LC_ALL" locale))
                      (lambda _
                        ;; Sometimes LOCALE itself is not available.  In that
                        ;; case pick the one UTF-8 locale that's known to work
                        ;; instead of failing.
                        (setlocale LC_ALL "en_US.utf8")
                        (setenv "LC_ALL" "en_US.utf8")))

                    (execl #$(file-append info-reader "/bin/info")
                           "info" "-d" infodir "-f" file "-n" node))))

(define (documentation-shepherd-service tty)
  (list (shepherd-service
         (provision (list (symbol-append 'term- (string->symbol tty))))
         (requirement '(user-processes host-name udev virtual-terminal))
         (start #~(lambda* (#:optional (locale "en_US.utf8"))
                    (fork+exec-command
                     (list #$(log-to-info tty "documentation") locale)
                     #:environment-variables
                     `("GUIX_LOCPATH=/run/current-system/locale"
                       "TERM=linux"))))
         (stop #~(make-kill-destructor)))))

(define %documentation-users
  ;; User account for the Info viewer.
  (list (user-account (name "documentation")
                      (system? #t)
                      (group "nogroup")
                      (home-directory "/var/empty"))))

(define documentation-service-type
  ;; Documentation viewer service.
  (service-type (name 'documentation)
                (extensions
                 (list (service-extension shepherd-root-service-type
                                          documentation-shepherd-service)
                       (service-extension account-service-type
                                          (const %documentation-users))))
                (description "Run the Info reader on a tty.")))

\f
(define %backing-directory
  ;; Sub-directory used as the backing store for copy-on-write.
  "/tmp/guix-inst")

(define (make-cow-store target)
  "Return a gexp that makes the store copy-on-write, using TARGET as the
backing store.  This is useful when TARGET is on a hard disk, whereas the
current store is on a RAM disk."

  (define (set-store-permissions directory)
    ;; Set the right perms on DIRECTORY to use it as the store.
    #~(begin
        (chown #$directory 0 30000)             ;use the fixed 'guixbuild' GID
        (chmod #$directory #o1775)))

  #~(begin
      ;; Bind-mount TARGET's /tmp in case we need space to build things.
      (let ((tmpdir (string-append #$target "/tmp")))
        (mkdir-p tmpdir)
        (mount tmpdir "/tmp" "none" MS_BIND))

      (let* ((rw-dir (string-append target #$%backing-directory))
             (work-dir (string-append rw-dir "/../.overlayfs-workdir")))
        (mkdir-p rw-dir)
        (mkdir-p work-dir)
        (mkdir-p "/.rw-store")
        #$(set-store-permissions #~rw-dir)
        #$(set-store-permissions "/.rw-store")

        ;; Mount the overlay, then atomically make it the store.
        (mount "none" "/.rw-store" "overlay" 0
               (string-append "lowerdir=" #$(%store-prefix) ","
                              "upperdir=" rw-dir ","
                              "workdir=" work-dir))
        (mount "/.rw-store" #$(%store-prefix) "" MS_MOVE)
        (rmdir "/.rw-store"))))

(define cow-store-service-type
  (shepherd-service-type
   'cow-store
   (lambda _
     (shepherd-service
      (requirement '(root-file-system user-processes))
      (provision '(cow-store))
      (documentation
       "Make the store copy-on-write, with writes going to \
the given target.")

      ;; This is meant to be explicitly started by the user.
      (auto-start? #f)

      (start #~(case-lambda
                 ((target)
                  #$(make-cow-store #~target)
                  target)
                 (else
                  ;; Do nothing, and mark the service as stopped.
                  #f)))
      (stop #~(lambda (target)
                ;; Delete the temporary directory, but leave everything
                ;; mounted as there may still be processes using it since
                ;; 'user-processes' doesn't depend on us.  The 'user-file-systems'
                ;; service will unmount TARGET eventually.
                (delete-file-recursively
                 (string-append target #$%backing-directory))))))))

(define (cow-store-service)
  "Return a service that makes the store copy-on-write, such that writes go to
the user's target storage device rather than on the RAM disk."
  ;; See <http://bugs.gnu.org/18061> for the initial report.
  (service cow-store-service-type 'mooooh!))


(define (/etc/configuration-files _)
  "Return a list of tuples representing configuration templates to add to
/etc."
  (define (file f)
    (local-file (string-append "examples/" f)))

  (define directory
    (computed-file "configuration-templates"
                   (with-imported-modules '((guix build utils))
                     #~(begin
                         (mkdir #$output)
                         (for-each (lambda (file target)
                                     (copy-file file
                                                (string-append #$output "/"
                                                               target)))
                                   '(#$(file "bare-bones.tmpl")
                                     #$(file "beaglebone-black.tmpl")
                                     #$(file "desktop.tmpl")
                                     #$(file "lightweight-desktop.tmpl"))
                                   '("bare-bones.scm"
                                     "beaglebone-black.scm"
                                     "desktop.scm"
                                     "lightweight-desktop.scm"))
                         #t))))

  `(("configuration" ,directory)))

(define configuration-template-service-type
  (service-type (name 'configuration-template)
                (extensions
                 (list (service-extension etc-service-type
                                          /etc/configuration-files)))))

(define %configuration-template-service
  (service configuration-template-service-type #t))


(define %nscd-minimal-caches
  ;; Minimal in-memory caching policy for nscd.
  (list (nscd-cache (database 'hosts)
                    (positive-time-to-live (* 3600 12))

                    ;; Do not cache lookup failures at all since they are
                    ;; quite likely (for instance when someone tries to ping a
                    ;; host before networking is functional.)
                    (negative-time-to-live 0)

                    (persistent? #f)
                    (max-database-size (* 5 (expt 2 20)))))) ;5 MiB

(define %installation-services
  ;; List of services of the installation system.
  (let ((motd (plain-file "motd" "
\x1b[1;37mWelcome to the installation of GNU Guix!\x1b[0m

\x1b[2m\
Using this shell, you can carry out the installation process \"manually.\"
Access documentation at any time by pressing Alt-F2.\x1b[0m
")))
    (define (normal-tty tty)
      (mingetty-service (mingetty-configuration (tty tty)
                                                (auto-login "root")
                                                (login-pause? #t))))

    (define bare-bones-os
      (load "examples/bare-bones.tmpl"))

    (list (service virtual-terminal-service-type)

          (service kmscon-service-type
                   (kmscon-configuration
                    (virtual-terminal "tty1")
                    (login-program (installer-program))))

          (login-service (login-configuration
                          (motd motd)))

          ;; Documentation.  The manual is in UTF-8, but
          ;; 'console-font-service' sets up Unicode support and loads a font
          ;; with all the useful glyphs like em dash and quotation marks.
          (service documentation-service-type "tty2")

          ;; Documentation add-on.
          %configuration-template-service

          ;; A bunch of 'root' ttys.
          (normal-tty "tty3")
          (normal-tty "tty4")
          (normal-tty "tty5")
          (normal-tty "tty6")

          ;; The usual services.
          (syslog-service)

          ;; The build daemon.  Register the default substitute server key(s)
          ;; as trusted to allow the installation process to use substitutes by
          ;; default.
          (service guix-service-type
                   (guix-configuration (authorize-key? #t)))

          ;; Start udev so that useful device nodes are available.
          ;; Use device-mapper rules for cryptsetup & co; enable the CRDA for
          ;; regulations-compliant WiFi access.
          (udev-service #:rules (list lvm2 crda))

          ;; Add the 'cow-store' service, which users have to start manually
          ;; since it takes the installation directory as an argument.
          (cow-store-service)

          ;; Install Unicode support and a suitable font.
          (service console-font-service-type
                   (map (match-lambda
                          ("tty2"
                           ;; Use a font that contains characters such as
                           ;; curly quotes as found in the manual.
                           '("tty2" . "LatGrkCyr-8x16"))
                          (tty
                           ;; Use a font that doesn't have more than 256
                           ;; glyphs so that we can use colors with varying
                           ;; brightness levels (see note in setfont(8)).
                           `(,tty . "lat9u-16")))
                        '("tty1" "tty2" "tty3" "tty4" "tty5" "tty6")))

          ;; To facilitate copy/paste.
          (service gpm-service-type)

          ;; Add an SSH server to facilitate remote installs.
          (service openssh-service-type
                   (openssh-configuration
                    (port-number 22)
                    (permit-root-login #t)
                    ;; The root account is passwordless, so make sure
                    ;; a password is set before allowing logins.
                    (allow-empty-passwords? #f)
                    (password-authentication? #t)

                    ;; Don't start it upfront.
                    (%auto-start? #f)))

          ;; Since this is running on a USB stick with a overlayfs as the root
          ;; file system, use an appropriate cache configuration.
          (nscd-service (nscd-configuration
                         (caches %nscd-minimal-caches)))

          ;; Having /bin/sh is a good idea.  In particular it allows Tramp
          ;; connections to this system to work.
          (service special-files-service-type
                   `(("/bin/sh" ,(file-append (canonical-package bash)
                                              "/bin/sh"))))

          ;; Loopback device, needed by OpenSSH notably.
          (service static-networking-service-type
                   (list (static-networking (interface "lo")
                                            (ip "127.0.0.1")
                                            (requirement '())
                                            (provision '(loopback)))))

          (service wpa-supplicant-service-type)
          (dbus-service)
          (service connman-service-type
                   (connman-configuration
                    (disable-vpn? #t)))

          ;; Keep a reference to BARE-BONES-OS to make sure it can be
          ;; installed without downloading/building anything.  Also keep the
          ;; things needed by 'profile-derivation' to minimize the amount of
          ;; download.
          (service gc-root-service-type
                   (list bare-bones-os
                         glibc-utf8-locales
                         texinfo
                         (canonical-package guile-2.2))))))

(define %issue
  ;; Greeting.
  "
\x1b[1;37mThis is an installation image of the GNU system.  Welcome.\x1b[0m

\x1b[1;33mUse Alt-F2 for documentation.\x1b[0m
")

(define installation-os
  ;; The operating system used on installation images for USB sticks etc.
  (operating-system
    (host-name "gnu")
    (timezone "Europe/Paris")
    (locale "en_US.utf8")
    (bootloader (bootloader-configuration
                 (bootloader grub-bootloader)
                 (target "/dev/sda")))
    (label (string-append "GNU Guix installation "
                          (package-version guix)))
    (initrd-modules (append (list "cirrus" "cirrusfb")
                          %base-initrd-modules))

    ;; XXX: The AMD Radeon driver is reportedly broken, which makes kmscon
    ;; non-functional:
    ;; <https://lists.gnu.org/archive/html/guix-devel/2019-03/msg00441.html>.
    ;; Thus, blacklist it.
    (kernel-arguments '("quiet" "modprobe.blacklist=radeon"))

    (file-systems
     ;; Note: the disk image build code overrides this root file system with
     ;; the appropriate one.
     (cons* (file-system
              (mount-point "/")
              (device (file-system-label "Guix_image"))
              (type "ext4"))

            ;; Make /tmp a tmpfs instead of keeping the overlayfs.  This
            ;; originally was used for unionfs because FUSE creates
            ;; '.fuse_hiddenXYZ' files for each open file, and this confuses
            ;; Guix's test suite, for instance (see
            ;; <http://bugs.gnu.org/23056>).  We keep this for overlayfs to be
            ;; on the safe side.
            (file-system
              (mount-point "/tmp")
              (device "none")
              (type "tmpfs")
              (check? #f))

            ;; XXX: This should be %BASE-FILE-SYSTEMS but we don't need
            ;; elogind's cgroup file systems.
            (list %pseudo-terminal-file-system
                  %shared-memory-file-system
                  %immutable-store)))

    (users (list (user-account
                  (name "guest")
                  (group "users")
                  (supplementary-groups '("wheel")) ; allow use of sudo
                  (password "")
                  (comment "Guest of GNU"))))

    (issue %issue)
    (services %installation-services)

    ;; We don't need setuid programs, except for 'passwd', which can be handy
    ;; if one is to allow remote SSH login to the machine being installed.
    (setuid-programs (list (file-append shadow "/bin/passwd")))

    (pam-services
     ;; Explicitly allow for empty passwords.
     (base-pam-services #:allow-empty-passwords? #t))

    (packages (cons* (canonical-package glibc) ;for 'tzselect' & co.
                     parted gptfdisk ddrescue
                     fontconfig
                     font-dejavu font-gnu-unifont
                     grub                  ;mostly so xrefs to its manual work
                     cryptsetup
                     mdadm
                     dosfstools         ;mkfs.fat, for the UEFI boot partition
                     btrfs-progs
                     openssh    ;we already have sshd, having ssh/scp can help
                     wireless-tools iw wpa-supplicant-minimal iproute
                     ;; XXX: We used to have GNU fdisk here, but as of version
                     ;; 2.0.0a, that pulls Guile 1.8, which takes unreasonable
                     ;; space; furthermore util-linux's fdisk is already
                     ;; available here, so we keep that.
                     bash-completion
                     nvi                          ;:wq!
                     nss-certs ; To access HTTPS, use git, etc.
                     %base-packages))))

(define* (os-with-u-boot os board #:key (bootloader-target "/dev/mmcblk0")
                         (triplet "arm-linux-gnueabihf"))
  "Given OS, amend it with the u-boot bootloader for BOARD,
installed to BOOTLOADER-TARGET (a drive), compiled for TRIPLET.

If you want a serial console, make sure to specify one in your
operating-system's kernel-arguments (\"console=ttyS0\" or similar)."
  (operating-system (inherit os)
    (bootloader (bootloader-configuration
                 (bootloader (bootloader (inherit u-boot-bootloader)
                              (package (make-u-boot-package board triplet))))
                 (target bootloader-target)))))

(define* (embedded-installation-os bootloader bootloader-target tty
                                   #:key (extra-modules '()))
  "Return an installation os for embedded systems.
The initrd gets the extra modules EXTRA-MODULES.
A getty is provided on TTY.
The bootloader BOOTLOADER is installed to BOOTLOADER-TARGET."
  (operating-system
    (inherit installation-os)
    (bootloader (bootloader-configuration
                 (bootloader bootloader)
                 (target bootloader-target)))
    (kernel linux-libre)
    (kernel-arguments
     (cons (string-append "console=" tty)
           (operating-system-user-kernel-arguments installation-os)))
    (initrd-modules (append extra-modules %base-initrd-modules))))

(define beaglebone-black-installation-os
  (embedded-installation-os u-boot-beaglebone-black-bootloader
                            "/dev/sda"
                            "ttyO0"
                            #:extra-modules
                            ;; This module is required to mount the sd card.
                            '("omap_hsmmc")))


(define a20-olinuxino-lime-installation-os
  (embedded-installation-os u-boot-a20-olinuxino-lime-bootloader
                            "/dev/mmcblk0" ; SD card storage
                            "ttyS0"))

(define a20-olinuxino-lime2-emmc-installation-os
  (embedded-installation-os u-boot-a20-olinuxino-lime2-bootloader
                            "/dev/mmcblk1" ; eMMC storage
                            "ttyS0"))

(define a20-olinuxino-micro-installation-os
  (embedded-installation-os u-boot-a20-olinuxino-micro-bootloader
                            "/dev/mmcblk0" ; SD card storage
                            "ttyS0"))

(define bananapi-m2-ultra-installation-os
  (embedded-installation-os u-boot-bananapi-m2-ultra-bootloader
                            "/dev/mmcblk1" ; eMMC storage
                            "ttyS0"))

(define mx6cuboxi-installation-os
  (embedded-installation-os u-boot-mx6cuboxi-bootloader
                            "/dev/mmcblk0" ; SD card storage
                            "ttymxc0"))

(define novena-installation-os
  (embedded-installation-os u-boot-novena-bootloader
                            "/dev/mmcblk1" ; SD card storage
                            "ttymxc1"))

(define nintendo-nes-classic-edition-installation-os
  (embedded-installation-os u-boot-nintendo-nes-classic-edition-bootloader
                            "/dev/mmcblk0" ; SD card (solder it yourself)
                            "ttyS0"))

(define pine64-plus-installation-os
  (embedded-installation-os u-boot-pine64-plus-bootloader
                            "/dev/mmcblk0" ; SD card storage
                            "ttyS0"))

(define pinebook-installation-os
  (embedded-installation-os u-boot-pinebook-bootloader
                            "/dev/mmcblk0" ; SD card storage
                            "ttyS0"))

(define rk3399-puma-installation-os
  (embedded-installation-os u-boot-puma-rk3399-bootloader
                            "/dev/mmcblk0" ; SD card storage
                            "ttyS0"))

(define wandboard-installation-os
  (embedded-installation-os u-boot-wandboard-bootloader
                            "/dev/mmcblk0" ; SD card storage
                            "ttymxc0"))

;; Return the default os here so 'guix system' can consume it directly.
installation-os

;;; install.scm ends here

debug log:

solving 3e692a5bdc ...
found 3e692a5bdc in https://yhetil.org/guix/20190722112518.46e817d0@alma-ubu/
found 912096027f in https://git.savannah.gnu.org/cgit/guix.git
preparing index
index prepared:
100644 912096027f53e6354db47abfd3510a72c78faf3f	gnu/system/install.scm

applying [1/1] https://yhetil.org/guix/20190722112518.46e817d0@alma-ubu/
diff --git a/gnu/system/install.scm b/gnu/system/install.scm
index 912096027f..3e692a5bdc 100644

Checking patch gnu/system/install.scm...
Applied patch gnu/system/install.scm cleanly.

index at:
100644 3e692a5bdcbc239befe413388af0220ee64f795b	gnu/system/install.scm

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    Blobs themselves have no identifier aside from the hash of its contents.^

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