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;;; GNU Guix --- Functional package management for GNU
;;; Copyright © 2014, 2016, 2017 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 (build-self)
#:use-module (gnu)
#:use-module (guix)
#:use-module (guix config)
#:use-module (srfi srfi-1)
#:use-module (srfi srfi-19)
#:use-module (ice-9 match)
#:export (build))
;;; Commentary:
;;;
;;; When loaded, this module returns a monadic procedure of at least one
;;; argument: the source tree to build. It returns a derivation that
;;; builds it.
;;;
;;; This file uses modules provided by the already-installed Guix. Those
;;; modules may be arbitrarily old compared to the version we want to
;;; build. Because of that, it must rely on the smallest set of features
;;; that are likely to be provided by the (guix) and (gnu) modules, and by
;;; Guile itself, forever and ever.
;;;
;;; Code:
;; The dependencies. Don't refer explicitly to the variables because they
;; could be renamed or shuffled around in modules over time. Conversely,
;; 'find-best-packages-by-name' is expected to always have the same semantics.
(define libgcrypt
(first (find-best-packages-by-name "libgcrypt" #f)))
(define zlib
(first (find-best-packages-by-name "zlib" #f)))
(define gzip
(first (find-best-packages-by-name "gzip" #f)))
(define bzip2
(first (find-best-packages-by-name "bzip2" #f)))
(define xz
(first (find-best-packages-by-name "xz" #f)))
(define (false-if-wrong-guile package)
"Return #f if PACKAGE depends on the \"wrong\" major version of Guile (e.g.,
2.0 instead of 2.2), otherwise return PACKAGE."
(let ((guile (any (match-lambda
((label (? package? dep) _ ...)
(and (string=? (package-name dep) "guile")
dep)))
(package-direct-inputs package))))
(and (or (not guile)
(string-prefix? (effective-version)
(package-version guile)))
package)))
(define (package-for-current-guile . names)
"Return the package with one of the given NAMES that depends on the current
Guile major version (2.0 or 2.2), or #f if none of the packages matches."
(let loop ((names names))
(match names
(()
#f)
((name rest ...)
(match (find-best-packages-by-name name #f)
(()
(loop rest))
((first _ ...)
(or (false-if-wrong-guile first)
(loop rest))))))))
(define guile-json
(package-for-current-guile "guile-json"
"guile2.2-json"
"guile2.0-json"))
(define guile-ssh
(package-for-current-guile "guile-ssh"
"guile2.2-ssh"
"guile2.0-ssh"))
(define guile-git
(package-for-current-guile "guile-git"
"guile2.0-git"))
(define guile-bytestructures
(package-for-current-guile "guile-bytestructures"
"guile2.0-bytestructures"))
;; The actual build procedure.
(define (top-source-directory)
"Return the name of the top-level directory of this source tree."
(and=> (assoc-ref (current-source-location) 'filename)
(lambda (file)
(string-append (dirname file) "/.."))))
(define (date-version-string)
"Return the current date and hour in UTC timezone, for use as a poor
person's version identifier."
;; XXX: Replace with a Git commit id.
(date->string (current-date 0) "~Y~m~d.~H"))
(define (guile-for-build)
"Return a derivation for Guile 2.0 or 2.2, whichever matches the currently
running Guile."
(package->derivation (cond-expand
(guile-2.2
(canonical-package
(specification->package "guile@2.2")))
(else
(canonical-package
(specification->package "guile@2.0"))))))
;; The procedure below is our return value.
(define* (build source
#:key verbose? (version (date-version-string))
#:allow-other-keys
#:rest rest)
"Return a derivation that unpacks SOURCE into STORE and compiles Scheme
files."
;; The '%xxxdir' variables were added to (guix config) in July 2016 so we
;; cannot assume that they are defined. Try to guess their value when
;; they're undefined (XXX: we get an incorrect guess when environment
;; variables such as 'NIX_STATE_DIR' are defined!).
(define storedir
(if (defined? '%storedir) %storedir %store-directory))
(define localstatedir
(if (defined? '%localstatedir) %localstatedir (dirname %state-directory)))
(define sysconfdir
(if (defined? '%sysconfdir) %sysconfdir (dirname %config-directory)))
(define sbindir
(if (defined? '%sbindir) %sbindir (dirname %guix-register-program)))
(define builder
#~(begin
(use-modules (guix build pull))
(letrec-syntax ((maybe-load-path
(syntax-rules ()
((_ item rest ...)
(let ((tail (maybe-load-path rest ...)))
(if (string? item)
(cons (string-append item
"/share/guile/site/"
#$(effective-version))
tail)
tail)))
((_)
'()))))
(set! %load-path
(append
(maybe-load-path #$guile-json #$guile-ssh
#$guile-git #$guile-bytestructures)
%load-path)))
(letrec-syntax ((maybe-load-compiled-path
(syntax-rules ()
((_ item rest ...)
(let ((tail (maybe-load-compiled-path rest ...)))
(if (string? item)
(cons (string-append item
"/lib/guile/"
#$(effective-version)
"/site-ccache")
tail)
tail)))
((_)
'()))))
(set! %load-compiled-path
(append
(maybe-load-compiled-path #$guile-json #$guile-ssh
#$guile-git #$guile-bytestructures)
%load-compiled-path)))
;; XXX: The 'guile-ssh' package prior to Guix commit 92b7258 was
;; broken: libguile-ssh could not be found. Work around that.
;; FIXME: We want Guile-SSH 0.10.2 or later anyway.
#$(if (string-prefix? "0.9." (package-version guile-ssh))
#~(setenv "LTDL_LIBRARY_PATH" (string-append #$guile-ssh "/lib"))
#t)
(build-guix #$output #$source
#:system #$%system
#:storedir #$storedir
#:localstatedir #$localstatedir
#:sysconfdir #$sysconfdir
#:sbindir #$sbindir
#:package-name #$%guix-package-name
#:package-version #$version
#:bug-report-address #$%guix-bug-report-address
#:home-page-url #$%guix-home-page-url
#:libgcrypt #$libgcrypt
#:zlib #$zlib
#:gzip #$gzip
#:bzip2 #$bzip2
#:xz #$xz
;; XXX: This is not perfect, enabling VERBOSE? means
;; building a different derivation.
#:debug-port (if #$verbose?
(current-error-port)
(%make-void-port "w")))))
(unless guile-git
;; XXX: Guix before February 2017 lacks a 'guile-git' package altogether.
;; If we try to upgrade anyway, the logic in (guix scripts pull) will not
;; build (guix git), which will leave us with an unusable 'guix pull'. To
;; avoid that, fail early.
(format (current-error-port)
"\
Your installation is too old and lacks a '~a' package.
Please upgrade to an intermediate version first, for instance with:
guix pull --url=https://git.savannah.gnu.org/cgit/guix.git/snapshot/v0.13.0.tar.gz
\n"
(match (effective-version)
("2.0" "guile2.0-git")
(_ "guile-git")))
(exit 1))
(mlet %store-monad ((guile (guile-for-build)))
(gexp->derivation "guix-latest" builder
#:modules '((guix build pull)
(guix build utils)
;; Closure of (guix modules).
(guix modules)
(guix memoization)
(guix sets))
;; Arrange so that our own (guix build …) modules are
;; used.
#:module-path (list (top-source-directory))
#:guile-for-build guile)))
;; This file is loaded by 'guix pull'; return it the build procedure.
build
;; Local Variables:
;; eval: (put 'with-load-path 'scheme-indent-function 1)
;; End:
;;; build-self.scm ends here