;;; GNU Guix --- Functional package management for GNU ;;; Copyright © 2013, 2014, 2015 Ludovic Courtès <ludo@gnu.org> ;;; ;;; 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) #:use-module (guix store) #:use-module (guix monads) #:use-module (guix gexp) #:use-module (guix records) #:use-module (guix packages) #:use-module (guix derivations) #:use-module (guix profiles) #:use-module (gnu packages base) #:use-module (gnu packages bash) #:use-module (gnu packages guile) #:use-module (gnu packages admin) #:use-module (gnu packages linux) #:use-module (gnu packages pciutils) #:use-module (gnu packages package-management) #:use-module (gnu packages less) #:use-module (gnu packages zile) #:use-module (gnu packages nano) #:use-module (gnu packages lsof) #:use-module (gnu packages gawk) #:use-module (gnu packages man) #:use-module (gnu packages compression) #:use-module (gnu packages firmware) #:autoload (gnu packages cryptsetup) (cryptsetup) #:use-module (gnu services) #:use-module (gnu services dmd) #:use-module (gnu services base) #:use-module (gnu system grub) #:use-module (gnu system shadow) #:use-module (gnu system nss) #:use-module (gnu system locale) #:use-module (gnu system linux) #:use-module (gnu system linux-initrd) #:use-module (gnu system file-systems) #:use-module (ice-9 match) #:use-module (srfi srfi-1) #:use-module (srfi srfi-26) #:use-module (srfi srfi-34) #:use-module (srfi srfi-35) #:export (operating-system operating-system? operating-system-bootloader operating-system-services operating-system-user-services operating-system-packages operating-system-host-name operating-system-hosts-file operating-system-kernel operating-system-initrd operating-system-users operating-system-groups operating-system-issue operating-system-timezone operating-system-locale operating-system-locale-definitions operating-system-mapped-devices operating-system-file-systems operating-system-activation-script operating-system-derivation operating-system-profile operating-system-grub.cfg local-host-aliases %setuid-programs %base-packages %base-firmware luks-device-mapping)) ;;; Commentary: ;;; ;;; This module supports whole-system configuration. ;;; ;;; Code: ;; System-wide configuration. ;; TODO: Add per-field docstrings/stexi. (define-record-type* <operating-system> operating-system make-operating-system operating-system? (kernel operating-system-kernel ; package (default linux-libre)) (bootloader operating-system-bootloader) ; <grub-configuration> (initrd operating-system-initrd ; (list fs) -> M derivation (default base-initrd)) (firmware operating-system-firmware ; list of packages (default %base-firmware)) (host-name operating-system-host-name) ; string (hosts-file operating-system-hosts-file ; M item | #f (default #f)) (mapped-devices operating-system-mapped-devices ; list of <mapped-device> (default '())) (file-systems operating-system-file-systems) ; list of fs (swap-devices operating-system-swap-devices ; list of strings (default '())) (users operating-system-users ; list of user accounts (default '())) (groups operating-system-groups ; list of user groups (default %base-groups)) (skeletons operating-system-skeletons ; list of name/monadic value (default (default-skeletons))) (issue operating-system-issue ; string (default %default-issue)) (packages operating-system-packages ; list of (PACKAGE OUTPUT...) (default %base-packages)) ; or just PACKAGE (timezone operating-system-timezone) ; string (locale operating-system-locale ; string (default "en_US.utf8")) (locale-definitions operating-system-locale-definitions ; list of <locale-definition> (default %default-locale-definitions)) (name-service-switch operating-system-name-service-switch ; <name-service-switch> (default %default-nss)) (services operating-system-user-services ; list of monadic services (default %base-services)) (pam-services operating-system-pam-services ; list of PAM services (default (base-pam-services))) (setuid-programs operating-system-setuid-programs (default %setuid-programs)) ; list of string-valued gexps (sudoers operating-system-sudoers ; /etc/sudoers contents (default %sudoers-specification))) ;;; ;;; Derivation. ;;; (define* (file-union name files) "Return a derivation that builds a directory containing all of FILES. Each item in FILES must be a list where the first element is the file name to use in the new directory, and the second element is a gexp denoting the target file." (define builder #~(begin (mkdir #$output) (chdir #$output) #$@(map (match-lambda ((target source) #~(symlink #$source #$target))) files))) (gexp->derivation name builder)) (define (directory-union name things) "Return a directory that is the union of THINGS." (match things ((one) ;; Only one thing; return it. (with-monad %store-monad (return one))) (_ (gexp->derivation name #~(begin (use-modules (guix build union)) (union-build #$output '#$things)) #:modules '((guix build union)) #:local-build? #t)))) ;;; ;;; Services. ;;; (define (open-luks-device source target) "Return a gexp that maps SOURCE to TARGET as a LUKS device, using 'cryptsetup'." #~(zero? (system* (string-append #$cryptsetup "/sbin/cryptsetup") "open" "--type" "luks" #$source #$target))) (define (close-luks-device source target) "Return a gexp that closes TARGET, a LUKS device." #~(zero? (system* (string-append #$cryptsetup "/sbin/cryptsetup") "close" #$target))) (define luks-device-mapping ;; The type of LUKS mapped devices. (mapped-device-kind (open open-luks-device) (close close-luks-device))) (define (other-file-system-services os) "Return file system services for the file systems of OS that are not marked as 'needed-for-boot'." (define file-systems (remove file-system-needed-for-boot? (operating-system-file-systems os))) (define (device-mappings fs) (filter (lambda (md) (string=? (string-append "/dev/mapper/" (mapped-device-target md)) (file-system-device fs))) (operating-system-mapped-devices os))) (define (requirements fs) (map (lambda (md) (symbol-append 'device-mapping- (string->symbol (mapped-device-target md)))) (device-mappings fs))) (sequence %store-monad (map (lambda (fs) (match fs (($ <file-system> device title target type flags opts #f check? create?) (file-system-service device target type #:title title #:requirements (requirements fs) #:check? check? #:create-mount-point? create? #:options opts #:flags flags)))) file-systems))) (define (mapped-device-user device file-systems) "Return a file system among FILE-SYSTEMS that uses DEVICE, or #f." (let ((target (string-append "/dev/mapper/" (mapped-device-target device)))) (find (lambda (fs) (string=? (file-system-device fs) target)) file-systems))) (define (operating-system-user-mapped-devices os) "Return the subset of mapped devices that can be installed in user-land--i.e., those not needed during boot." (let ((devices (operating-system-mapped-devices os)) (file-systems (operating-system-file-systems os))) (filter (lambda (md) (let ((user (mapped-device-user md file-systems))) (or (not user) (not (file-system-needed-for-boot? user))))) devices))) (define (operating-system-boot-mapped-devices os) "Return the subset of mapped devices that must be installed during boot, from the initrd." (let ((devices (operating-system-mapped-devices os)) (file-systems (operating-system-file-systems os))) (filter (lambda (md) (let ((user (mapped-device-user md file-systems))) (and user (file-system-needed-for-boot? user)))) devices))) (define (device-mapping-services os) "Return the list of device-mapping services for OS as a monadic list." (sequence %store-monad (map (lambda (md) (let* ((source (mapped-device-source md)) (target (mapped-device-target md)) (type (mapped-device-type md)) (open (mapped-device-kind-open type)) (close (mapped-device-kind-close type))) (device-mapping-service target (open source target) (close source target)))) (operating-system-user-mapped-devices os)))) (define (swap-services os) "Return the list of swap services for OS as a monadic list." (sequence %store-monad (map swap-service (operating-system-swap-devices os)))) (define (essential-services os) "Return the list of essential services for OS. These are special services that implement part of what's declared in OS are responsible for low-level bookkeeping." (define known-fs (map file-system-mount-point (operating-system-file-systems os))) (mlet* %store-monad ((mappings (device-mapping-services os)) (root-fs (root-file-system-service)) (other-fs (other-file-system-services os)) (unmount (user-unmount-service known-fs)) (swaps (swap-services os)) (procs (user-processes-service (map (compose first service-provision) other-fs))) (host-name (host-name-service (operating-system-host-name os)))) (return (cons* host-name procs root-fs unmount (append other-fs mappings swaps))))) (define (operating-system-services os) "Return all the services of OS, including \"internal\" services that do not explicitly appear in OS." (mlet %store-monad ((user (sequence %store-monad (operating-system-user-services os))) (essential (essential-services os))) (return (append essential user)))) ;;; ;;; /etc. ;;; (define %base-firmware ;; Firmware usable by default. (list ath9k-htc-firmware)) (define %base-packages ;; Default set of packages globally visible. It should include anything ;; required for basic administrator tasks. (cons* procps psmisc which less zile nano (@ (gnu packages admin) dmd) guix lsof ;for Guix's 'list-runtime-roots' pciutils usbutils util-linux inetutils isc-dhcp ;; wireless-tools is deprecated in favor of iw, but it's still what ;; many people are familiar with, so keep it around. iw wireless-tools net-tools ; XXX: remove when Inetutils suffices man-db ;; The 'sudo' command is already in %SETUID-PROGRAMS, but we also ;; want the other commands and the man pages (notably because ;; auto-completion in Emacs shell relies on man pages.) sudo ;; Get 'insmod' & co. from kmod, not module-init-tools, since udev ;; already depends on it anyway. kmod eudev e2fsprogs kbd bash-completion ;; The packages below are also in %FINAL-INPUTS, so take them from ;; there to avoid duplication. (map canonical-package (list guile-2.0 bash coreutils findutils grep sed diffutils patch gawk tar gzip bzip2 xz lzip)))) (define %default-issue ;; Default contents for /etc/issue. " This is the GNU system. Welcome.\n") (define (local-host-aliases host-name) "Return aliases for HOST-NAME, to be used in /etc/hosts." (string-append "127.0.0.1 localhost " host-name "\n" "::1 localhost " host-name "\n")) (define (default-/etc/hosts host-name) "Return the default /etc/hosts file." (text-file "hosts" (local-host-aliases host-name))) (define (emacs-site-file) "Return the Emacs 'site-start.el' file. That file contains the necessary settings for 'guix.el' to work out-of-the-box." (gexp->file "site-start.el" #~(progn ;; Add the "normal" elisp directory to the search path; ;; guix.el may be there. (add-to-list 'load-path "/run/current-system/profile/share/emacs/site-lisp") ;; Attempt to load guix.el. (require 'guix-init nil t) (when (require 'geiser-guile nil t) ;; Make sure Geiser's Scheme modules are in Guile's search ;; path. (add-to-list 'geiser-guile-load-path "/run/current-system/profile/share/geiser/guile"))))) (define (emacs-site-directory) "Return the Emacs site directory, aka. /etc/emacs." (mlet %store-monad ((file (emacs-site-file))) (gexp->derivation "emacs" #~(begin (mkdir #$output) (chdir #$output) (symlink #$file "site-start.el"))))) (define* (etc-directory #:key (locale "C") (timezone "Europe/Paris") (issue "Hello!\n") (skeletons '()) (pam-services '()) (profile "/run/current-system/profile") hosts-file nss (sudoers "")) "Return a derivation that builds the static part of the /etc directory." (mlet* %store-monad ((pam.d (pam-services->directory pam-services)) (sudoers (text-file "sudoers" sudoers)) (login.defs (text-file "login.defs" "# Empty for now.\n")) ;; /etc/shells is used by xterm and other programs. We don't check ;; whether these shells are installed, should be OK. (shells (text-file "shells" "\ /bin/sh /run/current-system/profile/bin/sh /run/current-system/profile/bin/bash /run/current-system/profile/bin/fish /run/current-system/profile/bin/tcsh /run/current-system/profile/bin/zsh\n")) (emacs (emacs-site-directory)) (issue (text-file "issue" issue)) (nsswitch (text-file "nsswitch.conf" (name-service-switch->string nss))) ;; Startup file for POSIX-compliant login shells, which set system-wide ;; environment variables. (profile (text-file* "profile" "\ export LANG=\"" locale "\" export TZ=\"" timezone "\" export TZDIR=\"" tzdata "/share/zoneinfo\" # Tell 'modprobe' & co. where to look for modules. export LINUX_MODULE_DIRECTORY=/run/booted-system/kernel/lib/modules export PATH=$HOME/.guix-profile/bin:/run/current-system/profile/bin export PATH=/run/setuid-programs:/run/current-system/profile/sbin:$PATH export MANPATH=$HOME/.guix-profile/share/man:/run/current-system/profile/share/man export INFOPATH=$HOME/.guix-profile/share/info:/run/current-system/profile/share/info export XDG_DATA_DIRS=$HOME/.guix-profile/share:/run/current-system/profile/share export XDG_CONFIG_DIRS=$HOME/.guix-profile/etc/xdg:/run/current-system/profile/etc/xdg # Append the directory of 'site-start.el' to the search path. export EMACSLOADPATH=:/etc/emacs # By default, applications that use D-Bus, such as Emacs, abort at startup # when /etc/machine-id is missing. Make sure these warnings are non-fatal. export DBUS_FATAL_WARNINGS=0 # These variables are honored by OpenSSL (libssl) and Git. export SSL_CERT_DIR=/etc/ssl/certs export SSL_CERT_FILE=\"$SSL_CERT_DIR/ca-certificates.crt\" export GIT_SSL_CAINFO=\"$SSL_CERT_FILE\" # Allow Aspell to find dictionaries installed in the user profile. export ASPELL_CONF=\"dict-dir $HOME/.guix-profile/lib/aspell\" if [ -n \"$BASH_VERSION\" -a -f /etc/bashrc ] then # Load Bash-specific initialization code. source /etc/bashrc fi ")) (bashrc (text-file "bashrc" "\ # Bash-specific initialization. # The 'bash-completion' package. if [ -f /run/current-system/profile/etc/profile.d/bash_completion.sh ] then # Bash-completion sources ~/.bash_completion. It installs a dynamic # completion loader that searches its own completion files as well # as those in ~/.guix-profile and /run/current-system/profile. source /run/current-system/profile/etc/profile.d/bash_completion.sh fi\n")) (skel (skeleton-directory skeletons))) (file-union "etc" `(("services" ,#~(string-append #$net-base "/etc/services")) ("protocols" ,#~(string-append #$net-base "/etc/protocols")) ("rpc" ,#~(string-append #$net-base "/etc/rpc")) ("emacs" ,#~#$emacs) ("pam.d" ,#~#$pam.d) ("login.defs" ,#~#$login.defs) ("issue" ,#~#$issue) ("nsswitch.conf" ,#~#$nsswitch) ("skel" ,#~#$skel) ("shells" ,#~#$shells) ("profile" ,#~#$profile) ("bashrc" ,#~#$bashrc) ("hosts" ,#~#$hosts-file) ("localtime" ,#~(string-append #$tzdata "/share/zoneinfo/" #$timezone)) ("sudoers" ,#~#$sudoers))))) (define (operating-system-profile os) "Return a derivation that builds the system profile of OS." (profile-derivation (manifest (map package->manifest-entry (operating-system-packages os))))) (define %root-account ;; Default root account. (user-account (name "root") (password "") (uid 0) (group "root") (comment "System administrator") (home-directory "/root"))) (define (operating-system-accounts os) "Return the user accounts for OS, including an obligatory 'root' account." (define users ;; Make sure there's a root account. (if (find (lambda (user) (and=> (user-account-uid user) zero?)) (operating-system-users os)) (operating-system-users os) (cons %root-account (operating-system-users os)))) (mlet %store-monad ((services (operating-system-services os))) (return (append users (append-map service-user-accounts services))))) (define (operating-system-etc-directory os) "Return that static part of the /etc directory of OS." (mlet* %store-monad ((services (operating-system-services os)) (pam-services -> ;; Services known to PAM. (append (operating-system-pam-services os) (append-map service-pam-services services))) (profile-drv (operating-system-profile os)) (skeletons (operating-system-skeletons os)) (/etc/hosts (or (operating-system-hosts-file os) (default-/etc/hosts (operating-system-host-name os))))) (etc-directory #:pam-services pam-services #:skeletons skeletons #:issue (operating-system-issue os) #:locale (operating-system-locale os) #:nss (operating-system-name-service-switch os) #:timezone (operating-system-timezone os) #:hosts-file /etc/hosts #:sudoers (operating-system-sudoers os) #:profile profile-drv))) (define %setuid-programs ;; Default set of setuid-root programs. (let ((shadow (@ (gnu packages admin) shadow))) (list #~(string-append #$shadow "/bin/passwd") #~(string-append #$shadow "/bin/su") #~(string-append #$inetutils "/bin/ping") #~(string-append #$sudo "/bin/sudo") #~(string-append #$fuse "/bin/fusermount")))) (define %sudoers-specification ;; Default /etc/sudoers contents: 'root' and all members of the 'wheel' ;; group can do anything. See ;; <http://www.sudo.ws/sudo/man/1.8.10/sudoers.man.html>. ;; TODO: Add a declarative API. "root ALL=(ALL) ALL %wheel ALL=(ALL) ALL\n") (define (user-group->gexp group) "Turn GROUP, a <user-group> object, into a list-valued gexp suitable for 'active-groups'." #~(list #$(user-group-name group) #$(user-group-password group) #$(user-group-id group) #$(user-group-system? group))) (define (user-account->gexp account) "Turn ACCOUNT, a <user-account> object, into a list-valued gexp suitable for 'activate-users'." #~`(#$(user-account-name account) #$(user-account-uid account) #$(user-account-group account) #$(user-account-supplementary-groups account) #$(user-account-comment account) #$(user-account-home-directory account) ,#$(user-account-shell account) ; this one is a gexp #$(user-account-password account) #$(user-account-system? account))) (define (modprobe-wrapper) "Return a wrapper for the 'modprobe' command that knows where modules live. This wrapper is typically invoked by the Linux kernel ('call_modprobe', in kernel/kmod.c), a situation where the 'LINUX_MODULE_DIRECTORY' environment variable is not set---hence the need for this wrapper." (let ((modprobe "/run/current-system/profile/bin/modprobe")) (gexp->script "modprobe" #~(begin (setenv "LINUX_MODULE_DIRECTORY" "/run/booted-system/kernel/lib/modules") (apply execl #$modprobe (cons #$modprobe (cdr (command-line)))))))) (define (operating-system-activation-script os) "Return the activation script for OS---i.e., the code that \"activates\" the stateful part of OS, including user accounts and groups, special directories, etc." (define %modules '((gnu build activation) (gnu build linux-boot) (gnu build linux-modules) (gnu build file-systems) (guix build utils) (guix elf))) (define (service-activations services) ;; Return the activation scripts for SERVICES. (let ((gexps (filter-map service-activate services))) (sequence %store-monad (map (cut gexp->file "activate-service.scm" <>) gexps)))) (mlet* %store-monad ((services (operating-system-services os)) (actions (service-activations services)) (etc (operating-system-etc-directory os)) (modules (imported-modules %modules)) (compiled (compiled-modules %modules)) (modprobe (modprobe-wrapper)) (firmware (directory-union "firmware" (operating-system-firmware os))) (accounts (operating-system-accounts os))) (define setuid-progs (operating-system-setuid-programs os)) (define user-specs (map user-account->gexp accounts)) (define groups (append (operating-system-groups os) (append-map service-user-groups services))) (define group-specs (map user-group->gexp groups)) (gexp->file "activate" #~(begin (eval-when (expand load eval) ;; Make sure 'use-modules' below succeeds. (set! %load-path (cons #$modules %load-path)) (set! %load-compiled-path (cons #$compiled %load-compiled-path))) (use-modules (gnu build activation)) ;; Make sure /bin/sh is valid and current. (activate-/bin/sh (string-append #$(canonical-package bash) "/bin/sh")) ;; Populate /etc. (activate-etc #$etc) ;; Add users and user groups. (setenv "PATH" (string-append #$(@ (gnu packages admin) shadow) "/sbin")) (activate-users+groups (list #$@user-specs) (list #$@group-specs)) ;; Activate setuid programs. (activate-setuid-programs (list #$@setuid-progs)) ;; Tell the kernel to use our 'modprobe' command. (activate-modprobe #$modprobe) ;; Tell the kernel where firmware is. (activate-firmware (string-append #$firmware "/lib/firmware")) ;; Run the services' activation snippets. ;; TODO: Use 'load-compiled'. (for-each primitive-load '#$actions) ;; Set up /run/current-system. (activate-current-system))))) (define (operating-system-boot-script os) "Return the boot script for OS---i.e., the code started by the initrd once we're running in the final root." (mlet* %store-monad ((services (operating-system-services os)) (activate (operating-system-activation-script os)) (dmd-conf (dmd-configuration-file services))) (gexp->file "boot" #~(begin ;; Activate the system. ;; TODO: Use 'load-compiled'. (primitive-load #$activate) ;; Keep track of the booted system. (false-if-exception (delete-file "/run/booted-system")) (symlink (readlink "/run/current-system") "/run/booted-system") ;; Close any remaining open file descriptors to be on the ;; safe side. This must be the very last thing we do, ;; because Guile has internal FDs such as 'sleep_pipe' ;; that need to be alive. (let loop ((fd 3)) (when (< fd 1024) (false-if-exception (close-fdes fd)) (loop (+ 1 fd)))) ;; Start dmd. (execl (string-append #$dmd "/bin/dmd") "dmd" "--config" #$dmd-conf))))) (define (operating-system-root-file-system os) "Return the root file system of OS." (find (match-lambda (($ <file-system> _ _ "/") #t) (_ #f)) (operating-system-file-systems os))) (define (operating-system-initrd-file os) "Return a gexp denoting the initrd file of OS." (define boot-file-systems (filter file-system-needed-for-boot? (operating-system-file-systems os))) (define mapped-devices (operating-system-boot-mapped-devices os)) (define make-initrd (operating-system-initrd os)) (mlet %store-monad ((initrd (make-initrd boot-file-systems #:mapped-devices mapped-devices))) (return #~(string-append #$initrd "/initrd")))) (define (operating-system-locale-directory os) "Return the directory containing the locales compiled for the definitions listed in OS. The C library expects to find it under /run/current-system/locale." ;; While we're at it, check whether the locale of OS is defined. (unless (member (operating-system-locale os) (map locale-definition-name (operating-system-locale-definitions os))) (raise (condition (&message (message "system locale lacks a definition"))))) (locale-directory (operating-system-locale-definitions os))) (define (kernel->grub-label kernel) "Return a label for the GRUB menu entry that boots KERNEL." (string-append "GNU with " (string-titlecase (package-name kernel)) " " (package-version kernel) " (alpha)")) (define* (operating-system-grub.cfg os #:optional (old-entries '())) "Return the GRUB configuration file for OS. Use OLD-ENTRIES to populate the \"old entries\" menu." (mlet* %store-monad ((system (operating-system-derivation os)) (root-fs -> (operating-system-root-file-system os)) (kernel -> (operating-system-kernel os)) (entries -> (list (menu-entry (label (kernel->grub-label kernel)) (linux kernel) (linux-arguments (list (string-append "--root=" (file-system-device root-fs)) #~(string-append "--system=" #$system) #~(string-append "--load=" #$system "/boot"))) (initrd #~(string-append #$system "/initrd")))))) (grub-configuration-file (operating-system-bootloader os) entries #:old-entries old-entries))) (define (operating-system-parameters-file os) "Return a file that describes the boot parameters of OS. The primary use of this file is the reconstruction of GRUB menu entries for old configurations." (mlet %store-monad ((initrd (operating-system-initrd-file os)) (root -> (operating-system-root-file-system os)) (label -> (kernel->grub-label (operating-system-kernel os)))) (gexp->file "parameters" #~(boot-parameters (version 0) (label #$label) (root-device #$(file-system-device root)) (kernel #$(operating-system-kernel os)) (initrd #$initrd))))) (define (operating-system-derivation os) "Return a derivation that builds OS." (mlet* %store-monad ((profile (operating-system-profile os)) (etc (operating-system-etc-directory os)) (boot (operating-system-boot-script os)) (kernel -> (operating-system-kernel os)) (initrd (operating-system-initrd-file os)) (locale (operating-system-locale-directory os)) (params (operating-system-parameters-file os))) (file-union "system" `(("boot" ,#~#$boot) ("kernel" ,#~#$kernel) ("parameters" ,#~#$params) ("initrd" ,initrd) ("profile" ,#~#$profile) ("locale" ,#~#$locale) ;used by libc ("etc" ,#~#$etc))))) ;;; system.scm ends here