0adabad72d
Reported by Matthew Jordan <matthewjordandevops@yandex.com> at <https://lists.gnu.org/archive/html/guix-devel/2016-05/msg00967.html>. * gnu/system/install.scm (make-cow-store): Bind-mount TARGET's /tmp on /tmp.
407 lines
16 KiB
Scheme
407 lines
16 KiB
Scheme
;;; GNU Guix --- Functional package management for GNU
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;;; Copyright © 2014, 2015, 2016 Ludovic Courtès <ludo@gnu.org>
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;;; Copyright © 2015 Mark H Weaver <mhw@netris.org>
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;;;
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;;; This file is part of GNU Guix.
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;;;
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;;; GNU Guix is free software; you can redistribute it and/or modify it
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;;; under the terms of the GNU General Public License as published by
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;;; the Free Software Foundation; either version 3 of the License, or (at
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;;; your option) any later version.
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;;;
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;;; GNU Guix is distributed in the hope that it will be useful, but
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;;; WITHOUT ANY WARRANTY; without even the implied warranty of
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;;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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;;; GNU General Public License for more details.
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;;;
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;;; You should have received a copy of the GNU General Public License
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;;; along with GNU Guix. If not, see <http://www.gnu.org/licenses/>.
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(define-module (gnu system install)
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#:use-module (gnu)
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#:use-module (guix gexp)
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#:use-module (guix store)
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#:use-module (guix monads)
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#:use-module ((guix store) #:select (%store-prefix))
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#:use-module (guix profiles)
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#:use-module (gnu services shepherd)
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#:use-module (gnu packages admin)
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#:use-module (gnu packages bash)
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#:use-module (gnu packages linux)
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#:use-module (gnu packages cryptsetup)
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#:use-module (gnu packages package-management)
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#:use-module (gnu packages disk)
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#:use-module (gnu packages grub)
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#:use-module (gnu packages texinfo)
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#:use-module (gnu packages compression)
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#:use-module (ice-9 match)
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#:use-module (srfi srfi-26)
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#:export (self-contained-tarball
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installation-os))
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;;; Commentary:
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;;;
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;;; This module provides an 'operating-system' definition for use on images
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;;; for USB sticks etc., for the installation of the GNU system.
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;;;
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;;; Code:
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(define* (self-contained-tarball #:key (guix guix))
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"Return a self-contained tarball containing a store initialized with the
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closure of GUIX. The tarball contains /gnu/store, /var/guix, and a profile
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under /root/.guix-profile where GUIX is installed."
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(mlet %store-monad ((profile (profile-derivation
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(manifest
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(list (package->manifest-entry guix))))))
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(define build
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#~(begin
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(use-modules (guix build utils)
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(gnu build install))
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(define %root "root")
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(setenv "PATH"
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(string-append #$guix "/sbin:" #$tar "/bin:" #$xz "/bin"))
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;; Note: there is not much to gain here with deduplication and there
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;; is the overhead of the '.links' directory, so turn it off.
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(populate-single-profile-directory %root
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#:profile #$profile
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#:closure "profile"
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#:deduplicate? #f)
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;; Create the tarball. Use GNU format so there's no file name
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;; length limitation.
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(with-directory-excursion %root
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(zero? (system* "tar" "--xz" "--format=gnu"
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;; Avoid non-determinism in the archive. Use
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;; mtime = 1, not zero, because that is what the
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;; daemon does for files in the store (see the
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;; 'mtimeStore' constant in local-store.cc.)
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"--sort=name"
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"--mtime=@1" ;for files in /var/guix
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"--owner=root:0"
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"--group=root:0"
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"--check-links"
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"-cvf" #$output
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;; Avoid adding / and /var to the tarball,
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;; so that the ownership and permissions of those
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;; directories will not be overwritten when
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;; extracting the archive. Do not include /root
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;; because the root account might have a different
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;; home directory.
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"./var/guix"
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(string-append "." (%store-directory)))))))
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(gexp->derivation "guix-tarball.tar.xz" build
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#:references-graphs `(("profile" ,profile))
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#:modules '((guix build utils)
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(guix build store-copy)
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(gnu build install)))))
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(define (log-to-info)
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"Return a script that spawns the Info reader on the right section of the
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manual."
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(program-file "log-to-info"
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#~(begin
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;; 'gunzip' is needed to decompress the doc.
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(setenv "PATH" (string-append #$gzip "/bin"))
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(execl (string-append #$info-reader "/bin/info") "info"
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"-d" "/run/current-system/profile/share/info"
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"-f" (string-append #$guix "/share/info/guix.info")
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"-n" "System Installation"))))
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(define %backing-directory
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;; Sub-directory used as the backing store for copy-on-write.
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"/tmp/guix-inst")
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(define (make-cow-store target)
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"Return a gexp that makes the store copy-on-write, using TARGET as the
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backing store. This is useful when TARGET is on a hard disk, whereas the
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current store is on a RAM disk."
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(define (unionfs read-only read-write mount-point)
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;; Make MOUNT-POINT the union of READ-ONLY and READ-WRITE.
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;; Note: in the command below, READ-WRITE appears before READ-ONLY so that
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;; it is considered a "higher-level branch", as per unionfs-fuse(8),
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;; thereby allowing files existing on READ-ONLY to be copied over to
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;; READ-WRITE.
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#~(fork+exec-command
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(list (string-append #$unionfs-fuse "/bin/unionfs")
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"-o"
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"cow,allow_other,use_ino,max_files=65536,nonempty"
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(string-append #$read-write "=RW:" #$read-only "=RO")
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#$mount-point)))
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(define (set-store-permissions directory)
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;; Set the right perms on DIRECTORY to use it as the store.
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#~(begin
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(chown #$directory 0 30000) ;use the fixed 'guixbuild' GID
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(chmod #$directory #o1775)))
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#~(begin
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;; Bind-mount TARGET's /tmp in case we need space to build things.
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(let ((tmpdir (string-append #$target "/tmp")))
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(mkdir-p tmpdir)
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(mount tmpdir "/tmp" "none" MS_BIND))
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(unless (file-exists? "/.ro-store")
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(mkdir "/.ro-store")
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(mount #$(%store-prefix) "/.ro-store" "none"
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(logior MS_BIND MS_RDONLY)))
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(let ((rw-dir (string-append target #$%backing-directory)))
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(mkdir-p rw-dir)
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(mkdir-p "/.rw-store")
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#$(set-store-permissions #~rw-dir)
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#$(set-store-permissions "/.rw-store")
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;; Mount the union, then atomically make it the store.
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(and #$(unionfs "/.ro-store" #~rw-dir "/.rw-store")
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(begin
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(sleep 1) ;XXX: wait for unionfs to be ready
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(mount "/.rw-store" #$(%store-prefix) "" MS_MOVE)
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(rmdir "/.rw-store"))))))
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(define cow-store-service-type
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(shepherd-service-type
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'cow-store
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(lambda _
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(shepherd-service
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(requirement '(root-file-system user-processes))
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(provision '(cow-store))
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(documentation
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"Make the store copy-on-write, with writes going to \
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the given target.")
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;; This is meant to be explicitly started by the user.
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(auto-start? #f)
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(start #~(case-lambda
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((target)
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#$(make-cow-store #~target)
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target)
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(else
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;; Do nothing, and mark the service as stopped.
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#f)))
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(stop #~(lambda (target)
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;; Delete the temporary directory, but leave everything
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;; mounted as there may still be processes using it since
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;; 'user-processes' doesn't depend on us. The 'user-unmount'
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;; service will unmount TARGET eventually.
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(delete-file-recursively
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(string-append target #$%backing-directory))))))))
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(define (cow-store-service)
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"Return a service that makes the store copy-on-write, such that writes go to
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the user's target storage device rather than on the RAM disk."
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;; See <http://bugs.gnu.org/18061> for the initial report.
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(service cow-store-service-type 'mooooh!))
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(define (/etc/configuration-files _)
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"Return a list of tuples representing configuration templates to add to
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/etc."
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(define (file f)
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(local-file (search-path %load-path
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(string-append "gnu/system/examples/" f))))
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(define directory
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(computed-file "configuration-templates"
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#~(begin
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(mkdir #$output)
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(for-each (lambda (file target)
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(copy-file file
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(string-append #$output "/"
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target)))
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'(#$(file "bare-bones.tmpl")
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#$(file "desktop.tmpl")
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#$(file "lightweight-desktop.tmpl"))
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'("bare-bones.scm"
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"desktop.scm"
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"lightweight-desktop.scm"))
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#t)
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#:modules '((guix build utils))))
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`(("configuration" ,directory)))
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(define configuration-template-service-type
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(service-type (name 'configuration-template)
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(extensions
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(list (service-extension etc-service-type
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/etc/configuration-files)))))
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(define %configuration-template-service
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(service configuration-template-service-type #t))
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(define %nscd-minimal-caches
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;; Minimal in-memory caching policy for nscd.
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(list (nscd-cache (database 'hosts)
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(positive-time-to-live (* 3600 12))
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;; Do not cache lookup failures at all since they are
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;; quite likely (for instance when someone tries to ping a
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;; host before networking is functional.)
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(negative-time-to-live 0)
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(persistent? #f)
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(max-database-size (* 5 (expt 2 20)))))) ;5 MiB
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(define (installation-services)
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"Return the list services for the installation image."
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(let ((motd (plain-file "motd" "
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Welcome to the installation of the Guix System Distribution!
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There is NO WARRANTY, to the extent permitted by law. In particular, you may
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LOSE ALL YOUR DATA as a side effect of the installation process. Furthermore,
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it is 'beta' software, so it may contain bugs.
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You have been warned. Thanks for being so brave.
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")))
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(define (normal-tty tty)
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(mingetty-service (mingetty-configuration (tty tty)
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(motd motd)
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(auto-login "root")
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(login-pause? #t))))
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(list (mingetty-service (mingetty-configuration
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(tty "tty1")
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(motd motd)
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(auto-login "root")))
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;; Documentation. The manual is in UTF-8, but
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;; 'console-font-service' sets up Unicode support and loads a font
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;; with all the useful glyphs like em dash and quotation marks.
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(mingetty-service (mingetty-configuration
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(tty "tty2")
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(motd motd)
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(auto-login "guest")
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(login-program (log-to-info))))
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;; Documentation add-on.
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%configuration-template-service
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;; A bunch of 'root' ttys.
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(normal-tty "tty3")
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(normal-tty "tty4")
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(normal-tty "tty5")
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(normal-tty "tty6")
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;; The usual services.
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(syslog-service)
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;; The build daemon. Register the hydra.gnu.org key as trusted.
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;; This allows the installation process to use substitutes by
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;; default.
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(guix-service (guix-configuration (authorize-key? #t)))
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;; Start udev so that useful device nodes are available.
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;; Use device-mapper rules for cryptsetup & co; enable the CRDA for
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;; regulations-compliant WiFi access.
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(udev-service #:rules (list lvm2 crda))
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;; Add the 'cow-store' service, which users have to start manually
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;; since it takes the installation directory as an argument.
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(cow-store-service)
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;; Install Unicode support and a suitable font.
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(console-font-service "tty1")
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(console-font-service "tty2")
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(console-font-service "tty3")
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(console-font-service "tty4")
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(console-font-service "tty5")
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(console-font-service "tty6")
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;; To facilitate copy/paste.
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(gpm-service)
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;; Since this is running on a USB stick with a unionfs as the root
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;; file system, use an appropriate cache configuration.
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(nscd-service (nscd-configuration
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(caches %nscd-minimal-caches))))))
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(define %issue
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;; Greeting.
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"
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This is an installation image of the GNU system. Welcome.
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Use Alt-F2 for documentation.
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")
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(define installation-os
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;; The operating system used on installation images for USB sticks etc.
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(operating-system
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(host-name "gnu")
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(timezone "Europe/Paris")
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(locale "en_US.utf8")
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(bootloader (grub-configuration
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(device "/dev/sda")))
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(file-systems
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;; Note: the disk image build code overrides this root file system with
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;; the appropriate one.
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(cons* (file-system
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(mount-point "/")
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(device "gnu-disk-image")
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(title 'label)
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(type "ext4"))
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;; Make /tmp a tmpfs instead of keeping the unionfs. This is
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;; because FUSE creates '.fuse_hiddenXYZ' files for each open file,
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;; and this confuses Guix's test suite, for instance. See
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;; <http://bugs.gnu.org/23056>.
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(file-system
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(mount-point "/tmp")
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(device "none")
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(title 'device)
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(type "tmpfs")
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(check? #f))
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;; XXX: This should be %BASE-FILE-SYSTEMS but we don't need
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;; elogind's cgroup file systems.
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(list %pseudo-terminal-file-system
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%shared-memory-file-system
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%immutable-store)))
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(users (list (user-account
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(name "guest")
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(group "users")
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(supplementary-groups '("wheel")) ; allow use of sudo
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(password "")
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(comment "Guest of GNU")
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(home-directory "/home/guest"))))
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(issue %issue)
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(services (installation-services))
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;; We don't need setuid programs so pass the empty list so we don't pull
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;; additional programs here.
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(setuid-programs '())
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(pam-services
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;; Explicitly allow for empty passwords.
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(base-pam-services #:allow-empty-passwords? #t))
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(packages (cons* (canonical-package glibc) ;for 'tzselect' & co.
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parted ddrescue
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grub ;mostly so xrefs to its manual work
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cryptsetup
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btrfs-progs
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wireless-tools iw wpa-supplicant-minimal iproute
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;; XXX: We used to have GNU fdisk here, but as of version
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;; 2.0.0a, that pulls Guile 1.8, which takes unreasonable
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;; space; furthermore util-linux's fdisk is already
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;; available here, so we keep that.
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bash-completion
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%base-packages))))
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;; Return it here so 'guix system' can consume it directly.
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installation-os
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;;; install.scm ends here
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