210 lines
8.2 KiB
Scheme
210 lines
8.2 KiB
Scheme
;;; GNU Guix --- Functional package management for GNU
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;;; Copyright © 2013, 2014, 2015, 2016, 2017, 2018 Ludovic Courtès <ludo@gnu.org>
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;;; Copyright © 2016 Chris Marusich <cmmarusich@gmail.com>
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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 store database)
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#:use-module (guix build utils)
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#:use-module (guix build store-copy)
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#:use-module (srfi srfi-26)
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#:use-module (ice-9 match)
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#:export (install-boot-config
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evaluate-populate-directive
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populate-root-file-system
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register-closure
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populate-single-profile-directory))
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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-boot-config bootcfg bootcfg-location mount-point)
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"Atomically copy BOOTCFG into BOOTCFG-LOCATION on the MOUNT-POINT. Note
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that the caller must make sure that BOOTCFG is registered as a GC root so
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that the fonts, background images, etc. referred to by BOOTCFG are not GC'd."
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(let* ((target (string-append mount-point bootcfg-location))
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(pivot (string-append target ".new")))
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(mkdir-p (dirname target))
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;; Copy BOOTCFG 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 bootcfg pivot)
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(rename-file pivot target)))
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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 shepherd
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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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("/var/guix/gcroots/profiles" -> "/var/guix/profiles")
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(directory "/bin")
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(directory "/tmp" 0 0 #o1777) ; sticky bit
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(directory "/var/tmp" 0 0 #o1777)
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(directory "/var/lock" 0 0 #o1777)
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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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(let ((generation-1 (string-append target
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"/var/guix/profiles/system-1-link")))
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(let try ()
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(catch 'system-error
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(lambda ()
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(symlink system generation-1))
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(lambda args
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;; If GENERATION-1 already exists, overwrite it.
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(if (= EEXIST (system-error-errno args))
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(begin
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(delete-file generation-1)
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(try))
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(apply throw args)))))))
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(define* (register-closure prefix closure
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#:key
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(deduplicate? #t) (reset-timestamps? #t)
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(schema (sql-schema)))
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"Register CLOSURE in PREFIX, where PREFIX is the directory name of the
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target store and CLOSURE is the name of a file containing a reference graph as
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produced by #:references-graphs.. As a side effect, if RESET-TIMESTAMPS? is
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true, reset timestamps on store files and, if DEDUPLICATE? is true,
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deduplicates files common to CLOSURE and the rest of PREFIX."
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(let ((items (call-with-input-file closure read-reference-graph)))
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(register-items items
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#:prefix prefix
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#:deduplicate? deduplicate?
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#:reset-timestamps? reset-timestamps?
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#:registration-time %epoch
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#:schema schema)))
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(define* (populate-single-profile-directory directory
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#:key profile closure
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deduplicate?
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register? schema)
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"Populate DIRECTORY with a store containing PROFILE, whose closure is given
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in the file called CLOSURE (as generated by #:references-graphs.) DIRECTORY
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is initialized to contain a single profile under /root pointing to PROFILE.
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When REGISTER? is true, initialize DIRECTORY/var/guix/db to reflect the
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contents of the store; DEDUPLICATE? determines whether to deduplicate files in
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the store.
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This is used to create the self-contained tarballs with 'guix pack'."
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(define (scope file)
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(string-append directory "/" file))
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(define %root-profile
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"/var/guix/profiles/per-user/root")
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(define (mkdir-p* dir)
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(mkdir-p (scope dir)))
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(define (symlink* old new)
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(symlink old (scope new)))
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;; Populate the store.
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(populate-store (list closure) directory)
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(when register?
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(register-closure (canonicalize-path directory) closure
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#:deduplicate? deduplicate?
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#:schema schema)
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(mkdir-p* "/var/guix/profiles")
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(mkdir-p* "/var/guix/gcroots")
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(symlink* "/var/guix/profiles"
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"/var/guix/gcroots/profiles"))
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;; Make root's profile, which makes it a GC root.
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(mkdir-p* %root-profile)
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(symlink* profile
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(string-append %root-profile "/guix-profile-1-link"))
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(symlink* (string-append %root-profile "/guix-profile-1-link")
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(string-append %root-profile "/guix-profile"))
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(mkdir-p* "/root")
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(symlink* (string-append %root-profile "/guix-profile")
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"/root/.guix-profile"))
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;;; install.scm ends here
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