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