Mirror of GNU Guix
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;;; GNU Guix --- Functional package management for GNU
;;; Copyright © 2013, 2014, 2015, 2016 Ludovic Courtès <ludo@gnu.org>
;;; Copyright © 2016 Alex Griffin <a@ajgrf.com>
;;;
;;; 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 shadow)
#:use-module (guix records)
#:use-module (guix gexp)
#:use-module (guix store)
#:use-module (guix sets)
#:use-module (guix ui)
#:use-module (gnu services)
#:use-module ((gnu system file-systems)
#:select (%tty-gid))
#:use-module ((gnu packages admin)
#:select (shadow))
#:use-module (gnu packages bash)
#:use-module (gnu packages guile-wm)
#:use-module (srfi srfi-1)
#:use-module (srfi srfi-26)
#:use-module (srfi srfi-34)
#:use-module (srfi srfi-35)
#:export (user-account
user-account?
user-account-name
user-account-password
user-account-uid
user-account-group
user-account-supplementary-groups
user-account-comment
user-account-home-directory
user-account-shell
user-account-system?
user-group
user-group?
user-group-name
user-group-password
user-group-id
user-group-system?
default-skeletons
skeleton-directory
%base-groups
%base-user-accounts
account-service-type
account-service))
;;; Commentary:
;;;
;;; Utilities for configuring the Shadow tool suite ('login', 'passwd', etc.)
;;;
;;; Code:
(define-record-type* <user-account>
user-account make-user-account
user-account?
(name user-account-name)
(password user-account-password (default #f))
(uid user-account-uid (default #f))
(group user-account-group) ; number | string
(supplementary-groups user-account-supplementary-groups
(default '())) ; list of strings
(comment user-account-comment (default ""))
(home-directory user-account-home-directory)
(shell user-account-shell ; gexp
(default #~(string-append #$bash "/bin/bash")))
(system? user-account-system? ; Boolean
(default #f)))
(define-record-type* <user-group>
user-group make-user-group
user-group?
(name user-group-name)
(password user-group-password (default #f))
(id user-group-id (default #f))
(system? user-group-system? ; Boolean
(default #f)))
(define %base-groups
;; Default set of groups.
(let-syntax ((system-group (syntax-rules ()
((_ args ...)
(user-group (system? #t) args ...)))))
(list (system-group (name "root") (id 0))
(system-group (name "wheel")) ; root-like users
(system-group (name "users")) ; normal users
(system-group (name "nogroup")) ; for daemons etc.
;; The following groups are conventionally used by things like udev to
;; control access to hardware devices.
(system-group (name "tty") (id %tty-gid))
(system-group (name "dialout"))
(system-group (name "kmem"))
(system-group (name "input")) ; input devices, from udev
(system-group (name "video"))
(system-group (name "audio"))
(system-group (name "netdev")) ; used in avahi-dbus.conf
(system-group (name "lp"))
(system-group (name "disk"))
(system-group (name "floppy"))
(system-group (name "cdrom"))
(system-group (name "tape"))
(system-group (name "kvm"))))) ; for /dev/kvm
(define %base-user-accounts
;; List of standard user accounts. Note that "root" is a special case, so
;; it's not listed here.
(list (user-account
(name "nobody")
(uid 65534)
(group "nogroup")
(home-directory "/var/empty")
(system? #t))))
(define (default-skeletons)
"Return the default skeleton files for /etc/skel. These files are copied by
'useradd' in the home directory of newly created user accounts."
(define fonts.conf-content
;; SXML for ~/.config/fontconfig/fonts.conf. This works around the fact
;; that Fontconfig currently does not such this directory by default,
;; thereby ignoring fonts installed system-wide (FIXME).
`(fontconfig (dir "/run/current-system/profile/share/fonts")))
(define copy-guile-wm
#~(begin
(use-modules (guix build utils))
(copy-file (car (find-files #$guile-wm "wm-init-sample.scm"))
#$output)))
(let ((profile (plain-file "bash_profile" "\
# Honor per-interactive-shell startup file
if [ -f ~/.bashrc ]; then . ~/.bashrc; fi\n"))
(bashrc (plain-file "bashrc" "\
# Bash initialization for interactive non-login shells and
# for remote shells (info \"(bash) Bash Startup Files\").
# Export 'SHELL' to child processes. Programs such as 'screen'
# honor it and otherwise use /bin/sh.
export SHELL
if [ -n \"$SSH_CLIENT\" -a -z \"`type -P cat`\" ]
then
# We are being invoked from a non-interactive SSH session
# (as in \"ssh host command\") but 'cat' cannot be found
# in $PATH. Source /etc/profile so we get $PATH and other
# essential variables.
source /etc/profile
fi
# Adjust the prompt depending on whether we're in 'guix environment'.
if [ -n \"$GUIX_ENVIRONMENT\" ]
then
PS1='\\u@\\h \\w [env]\\$ '
else
PS1='\\u@\\h \\w\\$ '
fi
alias ls='ls -p --color'
alias ll='ls -l'\n"))
(zlogin (plain-file "zlogin" "\
# Honor system-wide environment variables
source /etc/profile\n"))
(guile-wm (computed-file "guile-wm" copy-guile-wm
#:modules '((guix build utils))))
(xdefaults (plain-file "Xdefaults" "\
XTerm*utf8: always
XTerm*metaSendsEscape: true\n"))
(fonts.conf (computed-file
"fonts.conf"
#~(begin
(use-modules (guix build utils)
(sxml simple))
(define dir
(string-append #$output
"/fontconfig"))
(mkdir-p dir)
(call-with-output-file (string-append dir
"/fonts.conf")
(lambda (port)
(sxml->xml '#$fonts.conf-content port))))
#:modules '((guix build utils))))
(gdbinit (plain-file "gdbinit" "\
# Tell GDB where to look for separate debugging files.
set debug-file-directory ~/.guix-profile/lib/debug\n")))
`((".bash_profile" ,profile)
(".bashrc" ,bashrc)
(".zlogin" ,zlogin)
(".Xdefaults" ,xdefaults)
(".guile-wm" ,guile-wm)
(".config" ,fonts.conf)
(".gdbinit" ,gdbinit))))
(define (skeleton-directory skeletons)
"Return a directory containing SKELETONS, a list of name/derivation tuples."
(computed-file "skel"
#~(begin
(use-modules (ice-9 match)
(guix build utils))
(mkdir #$output)
(chdir #$output)
;; Note: copy the skeletons instead of symlinking
;; them like 'file-union' does, because 'useradd'
;; would just copy the symlinks as is.
(for-each (match-lambda
((target source)
(copy-recursively source target)))
'#$skeletons)
#t)
#:modules '((guix build utils))))
(define (assert-valid-users/groups users groups)
"Raise an error if USERS refer to groups not listed in GROUPS."
(let ((groups (list->set (map user-group-name groups))))
(define (validate-supplementary-group user group)
(unless (set-contains? groups group)
(raise (condition
(&message
(message
(format #f (_ "supplementary group '~a' \
of user '~a' is undeclared")
group
(user-account-name user))))))))
(for-each (lambda (user)
(unless (set-contains? groups (user-account-group user))
(raise (condition
(&message
(message
(format #f (_ "primary group '~a' \
of user '~a' is undeclared")
(user-account-group user)
(user-account-name user)))))))
(for-each (cut validate-supplementary-group user <>)
(user-account-supplementary-groups user)))
users)))
;;;
;;; Service.
;;;
(define (user-group->gexp group)
"Turn GROUP, a <user-group> object, into a list-valued gexp suitable for
'active-groups'."
#~(list #$(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 (account-activation accounts+groups)
"Return a gexp that activates ACCOUNTS+GROUPS, a list of <user-account> and
<user-group> objects. Raise an error if a user account refers to a undefined
group."
(define accounts
(filter user-account? accounts+groups))
(define user-specs
(map user-account->gexp accounts))
(define groups
(filter user-group? accounts+groups))
(define group-specs
(map user-group->gexp groups))
(assert-valid-users/groups accounts groups)
;; Add users and user groups.
#~(begin
(setenv "PATH"
(string-append #$(@ (gnu packages admin) shadow) "/sbin"))
(activate-users+groups (list #$@user-specs)
(list #$@group-specs))))
(define (shells-file shells)
"Return a file-like object that builds a shell list for use as /etc/shells
based on SHELLS. /etc/shells is used by xterm, polkit, and other programs."
(computed-file "shells"
#~(begin
(use-modules (srfi srfi-1))
(define shells
(delete-duplicates (list #$@shells)))
(call-with-output-file #$output
(lambda (port)
(display "\
/bin/sh
/run/current-system/profile/bin/sh
/run/current-system/profile/bin/bash\n" port)
(for-each (lambda (shell)
(display shell port)
(newline port))
shells))))))
(define (etc-files arguments)
"Filter out among ARGUMENTS things corresponding to skeletons, and return
the /etc/skel directory for those."
(let ((skels (filter pair? arguments))
(users (filter user-account? arguments)))
`(("skel" ,(skeleton-directory skels))
("shells" ,(shells-file (map user-account-shell users))))))
(define account-service-type
(service-type (name 'account)
;; Concatenate <user-account>, <user-group>, and skeleton
;; lists.
(compose concatenate)
(extend append)
(extensions
(list (service-extension activation-service-type
account-activation)
(service-extension etc-service-type
etc-files)))))
(define (account-service accounts+groups skeletons)
"Return a <service> that takes care of user accounts and user groups, with
ACCOUNTS+GROUPS as its initial list of accounts and groups."
(service account-service-type
(append skeletons accounts+groups)))
;;; shadow.scm ends here