mirror of
https://git.in.rschanz.org/ryan77627/guix.git
synced 2024-11-08 16:06:16 -05:00
8ce6f4dc28
When the store overlay is mounted, other processes such as kmscon, udev and guix-daemon may open files from the store, preventing the underlying install support from being umounted. See: https://lists.gnu.org/archive/html/guix-devel/2018-12/msg00161.html. To avoid this situation, mount the store overlay inside a container, and run the installation from within that container. * gnu/build/shepherd.scm (fork+exec-command/container): New procedure. * gnu/services/base.scm (guix-shepherd-service): Support an optional PID argument passed to the "start" method. If that argument is passed, ensure that guix-daemon enters the given PID MNT namespace by using fork+exec-command/container procedure. * gnu/installer/final.scm (umount-cow-store): Remove it, (install-system): run the installation from within a container. * gnu/installer/newt/final.scm (run-install-shell): Remove the display hack.
222 lines
9.3 KiB
Scheme
222 lines
9.3 KiB
Scheme
;;; GNU Guix --- Functional package management for GNU
|
|
;;; Copyright © 2018, 2020 Mathieu Othacehe <m.othacehe@gmail.com>
|
|
;;; Copyright © 2019, 2020 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 installer final)
|
|
#:use-module (gnu installer newt page)
|
|
#:use-module (gnu installer steps)
|
|
#:use-module (gnu installer utils)
|
|
#:use-module (gnu installer user)
|
|
#:use-module (gnu services herd)
|
|
#:use-module (guix build syscalls)
|
|
#:use-module (guix build utils)
|
|
#:use-module (gnu build accounts)
|
|
#:use-module (gnu build install)
|
|
#:use-module (gnu build linux-container)
|
|
#:use-module ((gnu system shadow) #:prefix sys:)
|
|
#:use-module (rnrs io ports)
|
|
#:use-module (srfi srfi-1)
|
|
#:use-module (ice-9 ftw)
|
|
#:use-module (ice-9 popen)
|
|
#:use-module (ice-9 match)
|
|
#:use-module (ice-9 format)
|
|
#:use-module (ice-9 rdelim)
|
|
#:export (install-system))
|
|
|
|
(define %seed
|
|
(seed->random-state
|
|
(logxor (getpid) (car (gettimeofday)))))
|
|
|
|
(define (integer->alphanumeric-char n)
|
|
"Map N, an integer in the [0..62] range, to an alphanumeric character."
|
|
(cond ((< n 10)
|
|
(integer->char (+ (char->integer #\0) n)))
|
|
((< n 36)
|
|
(integer->char (+ (char->integer #\A) (- n 10))))
|
|
((< n 62)
|
|
(integer->char (+ (char->integer #\a) (- n 36))))
|
|
(else
|
|
(error "integer out of bounds" n))))
|
|
|
|
(define (random-string len)
|
|
"Compute a random string of size LEN where each character is alphanumeric."
|
|
(let loop ((chars '())
|
|
(len len))
|
|
(if (zero? len)
|
|
(list->string chars)
|
|
(let ((n (random 62 %seed)))
|
|
(loop (cons (integer->alphanumeric-char n) chars)
|
|
(- len 1))))))
|
|
|
|
(define (create-user-database users root)
|
|
"Create /etc/passwd, /etc/shadow, and /etc/group under ROOT for the given
|
|
USERS."
|
|
(define etc
|
|
(string-append root "/etc"))
|
|
|
|
(define (salt)
|
|
;; "$6" gives us a SHA512 password hash; the random string must be taken
|
|
;; from the './0-9A-Za-z' alphabet (info "(libc) Passphrase Storage").
|
|
(string-append "$6$" (random-string 10)))
|
|
|
|
(define users*
|
|
(map (lambda (user)
|
|
(define root?
|
|
(string=? "root" (user-name user)))
|
|
|
|
(sys:user-account (name (user-name user))
|
|
(comment (user-real-name user))
|
|
(group "users")
|
|
(uid (if root? 0 #f))
|
|
(home-directory
|
|
(user-home-directory user))
|
|
(password (crypt (user-password user)
|
|
(salt)))
|
|
|
|
;; We need a string here, not a file-like, hence
|
|
;; this choice.
|
|
(shell
|
|
"/run/current-system/profile/bin/bash")))
|
|
users))
|
|
|
|
(define-values (group password shadow)
|
|
(user+group-databases users* sys:%base-groups
|
|
#:current-passwd '()
|
|
#:current-groups '()
|
|
#:current-shadow '()))
|
|
|
|
(mkdir-p etc)
|
|
(write-group group (string-append etc "/group"))
|
|
(write-passwd password (string-append etc "/passwd"))
|
|
(write-shadow shadow (string-append etc "/shadow")))
|
|
|
|
(define* (kill-cow-users cow-path #:key (spare '("udevd")))
|
|
"Kill all processes that have references to the given COW-PATH in their
|
|
'maps' file. The process whose names are in SPARE list are spared."
|
|
(define %not-nul
|
|
(char-set-complement (char-set #\nul)))
|
|
|
|
(let ((pids
|
|
(filter-map (lambda (pid)
|
|
(false-if-exception
|
|
(call-with-input-file
|
|
(string-append "/proc/" pid "/maps")
|
|
(lambda (port)
|
|
(and (string-contains (get-string-all port)
|
|
cow-path)
|
|
(string->number pid))))))
|
|
(scandir "/proc" string->number))))
|
|
(for-each (lambda (pid)
|
|
;; cmdline does not always exist.
|
|
(false-if-exception
|
|
(call-with-input-file
|
|
(string-append "/proc/" (number->string pid) "/cmdline")
|
|
(lambda (port)
|
|
(match (string-tokenize (read-string port) %not-nul)
|
|
((argv0 _ ...)
|
|
(unless (member (basename argv0) spare)
|
|
(syslog "Killing process ~a (~a)~%" pid argv0)
|
|
(kill pid SIGKILL)))
|
|
(_ #f))))))
|
|
pids)))
|
|
|
|
(define* (install-system locale #:key (users '()))
|
|
"Create /etc/shadow and /etc/passwd on the installation target for USERS.
|
|
Start COW-STORE service on target directory and launch guix install command in
|
|
a subshell. LOCALE must be the locale name under which that command will run,
|
|
or #f. Return #t on success and #f on failure."
|
|
(define backing-directory
|
|
;; Sub-directory used as the backing store for copy-on-write.
|
|
"/tmp/guix-inst")
|
|
|
|
(define (assert-exit x)
|
|
(primitive-exit (if x 0 1)))
|
|
|
|
(let* ((options (catch 'system-error
|
|
(lambda ()
|
|
;; If this file exists, it can provide
|
|
;; additional command-line options.
|
|
(call-with-input-file
|
|
"/tmp/installer-system-init-options"
|
|
read))
|
|
(const '())))
|
|
(install-command (append (list "guix" "system" "init"
|
|
"--fallback")
|
|
options
|
|
(list (%installer-configuration-file)
|
|
(%installer-target-dir))))
|
|
(database-dir "/var/guix/db")
|
|
(database-file (string-append database-dir "/db.sqlite"))
|
|
(saved-database (string-append database-dir "/db.save"))
|
|
(ret #f))
|
|
(mkdir-p (%installer-target-dir))
|
|
|
|
;; We want to initialize user passwords but we don't want to store them in
|
|
;; the config file since the password hashes would end up world-readable
|
|
;; in the store. Thus, create /etc/shadow & co. here such that, on the
|
|
;; first boot, the activation snippet that creates accounts will reuse the
|
|
;; passwords that we've put in there.
|
|
(create-user-database users (%installer-target-dir))
|
|
|
|
;; When the store overlay is mounted, other processes such as kmscon, udev
|
|
;; and guix-daemon may open files from the store, preventing the
|
|
;; underlying install support from being umounted. See:
|
|
;; https://lists.gnu.org/archive/html/guix-devel/2018-12/msg00161.html.
|
|
;;
|
|
;; To avoid this situation, mount the store overlay inside a container,
|
|
;; and run the installation from within that container.
|
|
(zero?
|
|
(call-with-container '()
|
|
(lambda ()
|
|
(dynamic-wind
|
|
(lambda ()
|
|
;; Save the database, so that it can be restored once the
|
|
;; cow-store is umounted.
|
|
(copy-file database-file saved-database)
|
|
(mount-cow-store (%installer-target-dir) backing-directory))
|
|
(lambda ()
|
|
;; We need to drag the guix-daemon to the container MNT
|
|
;; namespace, so that it can operate on the cow-store.
|
|
(stop-service 'guix-daemon)
|
|
(start-service 'guix-daemon (list (number->string (getpid))))
|
|
|
|
(setvbuf (current-output-port) 'none)
|
|
(setvbuf (current-error-port) 'none)
|
|
|
|
;; If there are any connected clients, assume that we are running
|
|
;; installation tests. In that case, dump the standard and error
|
|
;; outputs to syslog.
|
|
(set! ret
|
|
(if (not (null? (current-clients)))
|
|
(with-output-to-file "/dev/console"
|
|
(lambda ()
|
|
(with-error-to-file "/dev/console"
|
|
(lambda ()
|
|
(run-command install-command
|
|
#:locale locale)))))
|
|
(run-command install-command #:locale locale))))
|
|
(lambda ()
|
|
;; Restart guix-daemon so that it does no keep the MNT namespace
|
|
;; alive.
|
|
(restart-service 'guix-daemon)
|
|
(copy-file saved-database database-file)
|
|
|
|
;; Finally umount the cow-store and exit the container.
|
|
(unmount-cow-store (%installer-target-dir) backing-directory)
|
|
(assert-exit ret))))
|
|
#:namespaces '(mnt)))))
|