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;;; GNU Guix --- Functional package management for GNU
;;; Copyright © 2014-2022, 2024 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, 2019 Tobias Geerinckx-Rice <me@tobias.gr>
;;; Copyright © 2020 Florian Pelz <pelzflorian@pelzflorian.de>
;;; Copyright © 2020 Efraim Flashner <efraim@flashner.co.il>
;;; Copyright © 2022 Josselin Poiret <dev@jpoiret.xyz>
;;; Copyright © 2023 Herman Rimm <herman@rimm.ee>
;;;
;;; 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 system privilege)
  #:use-module (gnu bootloader u-boot)
  #:use-module (guix gexp)
  #:use-module (guix store)
  #:use-module (guix monads)
  #:use-module (guix modules)
  #:use-module ((guix packages) #:select (package-version supported-package?))
  #:use-module (guix platform)
  #:use-module ((guix store) #:select (%store-prefix))
  #:use-module (guix utils)
  #:use-module (gnu installer)
  #:use-module (gnu system locale)
  #:use-module (gnu services avahi)
  #: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 compression)
  #:use-module (gnu packages cryptsetup)
  #:use-module (gnu packages disk)
  #:use-module (gnu packages file-systems)
  #:use-module (gnu packages fonts)
  #:use-module (gnu packages fontutils)
  #:use-module (gnu packages guile)
  #:use-module (gnu packages linux)
  #:use-module (gnu packages package-management)
  #:use-module (gnu packages texinfo)
  #:use-module (gnu packages xorg)
  #: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
            orangepi-r1-plus-lts-rk3328-installation-os
            firefly-rk3399-installation-os
            pine64-plus-installation-os
            pinebook-installation-os
            rock64-installation-os
            rockpro64-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:


;;;
;;; 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.")))

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

(define cow-store-service-type
  (shepherd-service-type
   'cow-store
   (lambda _
     (define (import-module? module)
       ;; Since we don't use deduplication support in 'populate-store', don't
       ;; import (guix store deduplication) and its dependencies, which
       ;; includes Guile-Gcrypt.
       (and (guix-module-name? module)
            (not (equal? module '(guix store deduplication)))))

     (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)

      (modules `((gnu build install)
                 ,@%default-modules))
      (start
       (with-imported-modules (source-module-closure
                               '((gnu build install))
                               #:select? import-module?)
         #~(case-lambda
             ((target)
              (mount-cow-store target #$%backing-directory)
              target)
             (else
              ;; Do nothing, and mark the service as stopped.
              #f))))
      (stop #~(lambda (target)
                ;; Delete the temporary directory, but leave everything
                ;; mounted as there may still be processes using it since
                ;; 'user-processes' doesn't depend on us.  The 'user-file-systems'
                ;; service will unmount TARGET eventually.
                (delete-file-recursively
                 (string-append target #$%backing-directory))))))
   (description "Make the store copy-on-write, with writes going to \
the given target.")))

(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 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)))
                                   '(#$(local-file "examples/bare-bones.tmpl")
                                     #$(local-file "examples/beaglebone-black.tmpl")
                                     #$(local-file "examples/desktop.tmpl")
                                     #$(local-file "examples/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)))
                (description "Install the operating system configuration file
templates under @file{/etc/configuration}.")))

(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


;; These define a service to load the uvesafb kernel module with the
;; appropriate options.  The GUI installer needs it when the machine does not
;; support Kernel Mode Setting.  Otherwise kmscon is missing /dev/fb0.
(define (uvesafb-shepherd-service _)
  (define modprobe
    (program-file "modprobe-wrapper"
                  #~(begin
                      ;; Use a wrapper because shepherd 0.9.3 won't let us
                      ;; pass environment variables to the child process:
                      ;; <https://issues.guix.gnu.org/60106>.
                      (setenv "LINUX_MODULE_DIRECTORY"
                              "/run/booted-system/kernel/lib/modules")
                      (apply execl #$(file-append kmod "/bin/modprobe")
                             "modprobe" (cdr (command-line))))))

  (list (shepherd-service
         (documentation "Load the uvesafb kernel module if needed.")
         (provision '(maybe-uvesafb))
         (requirement '(file-systems))
         (start #~(lambda ()
                    (or (file-exists? "/dev/fb0")
                        (invoke #+modprobe
                                "uvesafb"
                                (string-append "v86d=" #$v86d "/sbin/v86d")
                                "mode_option=1024x768"))))
         (respawn? #f)
         (one-shot? #t))))

(define uvesafb-service-type
  (service-type
   (name 'uvesafb)
   (extensions
    (list (service-extension shepherd-root-service-type
                             uvesafb-shepherd-service)))
   (description
    "Load the @code{uvesafb} kernel module with the right options.")
   (default-value #t)))

(define* (%installation-services #:key (system (or (and=>
                                                    (%current-target-system)
                                                    platform-target->system)
                                                   (%current-system))))
  ;; 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)
      (service mingetty-service-type
               (mingetty-configuration (tty tty)
                                       (auto-login "root")
                                       (login-pause? #t))))

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

    (append
     ;; Generic services
     (list (service virtual-terminal-service-type)

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

           (service login-service-type
                    (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.
           (service syslog-service-type)

           ;; Use the Avahi daemon to discover substitute servers on the local
           ;; network.  It can be faster than fetching from remote servers.
           (service avahi-service-type)

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

                     ;; Install and run the current Guix rather than an older
                     ;; snapshot.
                     (guix (current-guix))))

           ;; Start udev so that useful device nodes are available.
           ;; Use device-mapper rules for cryptsetup & co; enable the CRDA for
           ;; regulations-compliant WiFi access.
           (service udev-service-type
                    (udev-configuration
                     (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.
           (service nscd-service-type
                    (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 bash "/bin/sh"))))

           ;; Loopback device, needed by OpenSSH notably.
           (service static-networking-service-type
                    (list %loopback-static-networking))

           (service wpa-supplicant-service-type)
           (service dbus-root-service-type)
           (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
                    (append
                     (list bare-bones-os
                           (libc-utf8-locales-for-target system)
                           texinfo
                           guile-3.0)
                     %default-locale-libcs)))

     ;; Specific system services

     ;; Machines without Kernel Mode Setting (those with many old and
     ;; current AMD GPUs, SiS GPUs, ...) need uvesafb to show the GUI
     ;; installer.  Some may also need a kernel parameter like nomodeset
     ;; or vga=793, but we leave that for the user to specify in GRUB.
     `(,@(if (supported-package? v86d system)
             (list (service uvesafb-service-type))
             '())))))

(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 %installer-disk-utilities
  ;; A well-rounded set of packages for interacting with disks, partitions and
  ;; file systems, included with the Guix installation image.
  (list parted gptfdisk ddrescue
        ;; Use the static LVM2 because it's already pulled in by the installer.
        lvm2-static
        ;; We used to provide fdisk from GNU fdisk, but as of version 2.0.0a
        ;; it pulls Guile 1.8, which takes unreasonable space; furthermore
        ;; util-linux's fdisk is already available, in %base-packages-linux.
        cryptsetup mdadm
        dosfstools
        btrfs-progs
        e2fsprogs
        f2fs-tools
        jfsutils
        xfsprogs))

(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")
    (name-service-switch %mdns-host-lookup-nss)
    (bootloader (bootloader-configuration
                 (bootloader grub-bootloader)
                 (targets '("/dev/sda"))))
    (label (string-append "GNU Guix installation "
                          (or (getenv "GUIX_DISPLAYED_VERSION")
                              (package-version guix))))

    ;; 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,amdgpu"))

    (file-systems
     ;; Note: the disk image build code overrides this root file system with
     ;; the appropriate one.
     (append %base-live-file-systems

            ;; 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
                  %efivars-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.
    (privileged-programs (list (privileged-program
                                (program (file-append shadow "/bin/passwd"))
                                (setuid? #t))))

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

    (packages (append
                (list glibc             ; for 'tzselect' & co.
                      fontconfig
                      font-dejavu font-gnu-unifont
                      grub)             ; mostly so xrefs to its manual work
                %installer-disk-utilities
                %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))))
                 (targets (list 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)
                 (targets (list 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 firefly-rk3399-installation-os
  (embedded-installation-os u-boot-firefly-rk3399-bootloader
                            "/dev/mmcblk0" ; SD card/eMMC (SD priority) storage
                            "ttyS2")) ; UART2 connected on the Pi2 bus

(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 orangepi-r1-plus-lts-rk3328-installation-os
  (embedded-installation-os u-boot-orangepi-r1-plus-lts-rk3328-bootloader
                            "/dev/mmcblk0" ; SD card storage
                            "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 rock64-installation-os
  (embedded-installation-os u-boot-rock64-rk3328-bootloader
                            "/dev/mmcblk0" ; SD card/eMMC (SD priority) storage
                            "ttyS2")) ; UART2 connected on the Pi2 bus

(define rockpro64-installation-os
  (embedded-installation-os u-boot-rockpro64-rk3399-bootloader
                            "/dev/mmcblk0" ; SD card/eMMC (SD priority) storage
                            "ttyS2")) ; UART2 connected on the Pi2 bus

(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
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If conditions are imposed on you (whether by court order, agreement or otherwise) that contradict the conditions of this License, they do not excuse you from the conditions of this License. If you cannot convey a covered work so as to satisfy simultaneously your obligations under this License and any other pertinent obligations, then as a consequence you may not convey it at all. For example, if you agree to terms that obligate you to collect a royalty for further conveying from those to whom you convey the Program, the only way you could satisfy both those terms and this License would be to refrain entirely from conveying the Program. 13. Use with the GNU Affero General Public License. Notwithstanding any other provision of this License, you have permission to link or combine any covered work with a work licensed under version 3 of the GNU Affero General Public License into a single combined work, and to convey the resulting work. The terms of this License will continue to apply to the part which is the covered work, but the special requirements of the GNU Affero General Public License, section 13, concerning interaction through a network will apply to the combination as such. 14. Revised Versions of this License. The Free Software Foundation may publish revised and/or new versions of the GNU General Public License from time to time. Such new versions will be similar in spirit to the present version, but may differ in detail to address new problems or concerns. Each version is given a distinguishing version number. If the Program specifies that a certain numbered version of the GNU General Public License "or any later version" applies to it, you have the option of following the terms and conditions either of that numbered version or of any later version published by the Free Software Foundation. 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IN NO EVENT UNLESS REQUIRED BY APPLICABLE LAW OR AGREED TO IN WRITING WILL ANY COPYRIGHT HOLDER, OR ANY OTHER PARTY WHO MODIFIES AND/OR CONVEYS THE PROGRAM AS PERMITTED ABOVE, BE LIABLE TO YOU FOR DAMAGES, INCLUDING ANY GENERAL, SPECIAL, INCIDENTAL OR CONSEQUENTIAL DAMAGES ARISING OUT OF THE USE OR INABILITY TO USE THE PROGRAM (INCLUDING BUT NOT LIMITED TO LOSS OF DATA OR DATA BEING RENDERED INACCURATE OR LOSSES SUSTAINED BY YOU OR THIRD PARTIES OR A FAILURE OF THE PROGRAM TO OPERATE WITH ANY OTHER PROGRAMS), EVEN IF SUCH HOLDER OR OTHER PARTY HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH DAMAGES. 17. Interpretation of Sections 15 and 16. If the disclaimer of warranty and limitation of liability provided above cannot be given local legal effect according to their terms, reviewing courts shall apply local law that most closely approximates an absolute waiver of all civil liability in connection with the Program, unless a warranty or assumption of liability accompanies a copy of the Program in return for a fee. END OF TERMS AND CONDITIONS How to Apply These Terms to Your New Programs If you develop a new program, and you want it to be of the greatest possible use to the public, the best way to achieve this is to make it free software which everyone can redistribute and change under these terms. To do so, attach the following notices to the program. It is safest to attach them to the start of each source file to most effectively state the exclusion of warranty; and each file should have at least the "copyright" line and a pointer to where the full notice is found. <one line to give the program's name and a brief idea of what it does.> Copyright (C) <year> <name of author> This program 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. This program 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 this program. If not, see <http://www.gnu.org/licenses/>. Also add information on how to contact you by electronic and paper mail. If the program does terminal interaction, make it output a short notice like this when it starts in an interactive mode: <program> Copyright (C) <year> <name of author> This program comes with ABSOLUTELY NO WARRANTY; for details type `show w'. This is free software, and you are welcome to redistribute it under certain conditions; type `show c' for details. The hypothetical commands `show w' and `show c' should show the appropriate parts of the General Public License. Of course, your program's commands might be different; for a GUI interface, you would use an "about box". You should also get your employer (if you work as a programmer) or school, if any, to sign a "copyright disclaimer" for the program, if necessary. For more information on this, and how to apply and follow the GNU GPL, see <http://www.gnu.org/licenses/>. The GNU General Public License does not permit incorporating your program into proprietary programs. If your program is a subroutine library, you may consider it more useful to permit linking proprietary applications with the library. If this is what you want to do, use the GNU Lesser General Public License instead of this License. But first, please read <http://www.gnu.org/philosophy/why-not-lgpl.html>.
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