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+;;; GNU Guix --- Functional package management for GNU
+;;; Copyright © 2013, 2014 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 build install)
+ #:use-module (guix build utils)
+ #:use-module (srfi srfi-26)
+ #:use-module (ice-9 match)
+ #:export (install-grub
+ populate-root-file-system
+ reset-timestamps
+ register-closure))
+
+;;; Commentary:
+;;;
+;;; This module supports the installation of the GNU system on a hard disk.
+;;; It is meant to be used both in a build environment (in derivations that
+;;; build VM images), and on the bare metal (when really installing the
+;;; system.)
+;;;
+;;; Code:
+
+(define* (install-grub grub.cfg device mount-point)
+ "Install GRUB with GRUB.CFG on DEVICE, which is assumed to be mounted on
+MOUNT-POINT."
+ (let* ((target (string-append mount-point "/boot/grub/grub.cfg"))
+ (pivot (string-append target ".new")))
+ (mkdir-p (dirname target))
+
+ ;; Copy GRUB.CFG instead of just symlinking it since it's not a GC root.
+ ;; Do that atomically.
+ (copy-file grub.cfg pivot)
+ (rename-file pivot target)
+
+ (unless (zero? (system* "grub-install" "--no-floppy"
+ "--boot-directory"
+ (string-append mount-point "/boot")
+ device))
+ (error "failed to install GRUB"))))
+
+(define (evaluate-populate-directive directive target)
+ "Evaluate DIRECTIVE, an sexp describing a file or directory to create under
+directory TARGET."
+ (let loop ((directive directive))
+ (match directive
+ (('directory name)
+ (mkdir-p (string-append target name)))
+ (('directory name uid gid)
+ (let ((dir (string-append target name)))
+ (mkdir-p dir)
+ (chown dir uid gid)))
+ (('directory name uid gid mode)
+ (loop `(directory ,name ,uid ,gid))
+ (chmod (string-append target name) mode))
+ ((new '-> old)
+ (symlink old (string-append target new))))))
+
+(define (directives store)
+ "Return a list of directives to populate the root file system that will host
+STORE."
+ `(;; Note: the store's GID is fixed precisely so we can set it here rather
+ ;; than at activation time.
+ (directory ,store 0 30000 #o1775)
+
+ (directory "/etc")
+ (directory "/var/log") ; for dmd
+ (directory "/var/guix/gcroots")
+ (directory "/var/empty") ; for no-login accounts
+ (directory "/var/db") ; for dhclient, etc.
+ (directory "/var/run")
+ (directory "/run")
+ (directory "/mnt")
+ (directory "/var/guix/profiles/per-user/root" 0 0)
+
+ ;; Link to the initial system generation.
+ ("/var/guix/profiles/system" -> "system-1-link")
+
+ ("/var/guix/gcroots/booted-system" -> "/run/booted-system")
+ ("/var/guix/gcroots/current-system" -> "/run/current-system")
+
+ (directory "/bin")
+ ("/bin/sh" -> "/run/current-system/profile/bin/bash")
+ (directory "/tmp" 0 0 #o1777) ; sticky bit
+
+ (directory "/root" 0 0) ; an exception
+ (directory "/home" 0 0)))
+
+(define (populate-root-file-system system target)
+ "Make the essential non-store files and directories on TARGET. This
+includes /etc, /var, /run, /bin/sh, etc., and all the symlinks to SYSTEM."
+ (for-each (cut evaluate-populate-directive <> target)
+ (directives (%store-directory)))
+
+ ;; Add system generation 1.
+ (symlink system
+ (string-append target "/var/guix/profiles/system-1-link")))
+
+(define (reset-timestamps directory)
+ "Reset the timestamps of all the files under DIRECTORY, so that they appear
+as created and modified at the Epoch."
+ (display "clearing file timestamps...\n")
+ (for-each (lambda (file)
+ (let ((s (lstat file)))
+ ;; XXX: Guile uses libc's 'utime' function (not 'futime'), so
+ ;; the timestamp of symlinks cannot be changed, and there are
+ ;; symlinks here pointing to /gnu/store, which is the host,
+ ;; read-only store.
+ (unless (eq? (stat:type s) 'symlink)
+ (utime file 0 0 0 0))))
+ (find-files directory "")))
+
+(define (register-closure store closure)
+ "Register CLOSURE in STORE, where STORE is the directory name of the target
+store and CLOSURE is the name of a file containing a reference graph as used
+by 'guix-register'. As a side effect, this resets timestamps on store files."
+ (let ((status (system* "guix-register" "--prefix" store
+ closure)))
+ (unless (zero? status)
+ (error "failed to register store items" closure))))
+
+;;; install.scm ends here