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+;;; GNU Guix --- Functional package management for GNU
+;;; Copyright © 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 (build-self)
+ #:use-module (gnu)
+ #:use-module (guix)
+ #:use-module (srfi srfi-1)
+ #: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 guile-json
+ (first (find-best-packages-by-name "guile-json" #f)))
+
+
+
+;; 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) "/.."))))
+
+;; The procedure below is our return value.
+(define* (build source #:key verbose?
+ #:allow-other-keys
+ #:rest rest)
+ "Return a derivation that unpacks SOURCE into STORE and compiles Scheme
+files."
+ (define builder
+ #~(begin
+ (use-modules (guix build pull))
+
+ (let ((json (string-append #$guile-json "/share/guile/site/2.0")))
+ (set! %load-path (cons json %load-path))
+ (set! %load-compiled-path (cons json %load-compiled-path)))
+
+ (build-guix #$output #$source
+
+ ;; XXX: This is not perfect, enabling VERBOSE? means
+ ;; building a different derivation.
+ #:debug-port (if #$verbose?
+ (current-error-port)
+ (%make-void-port "w"))
+ #:gcrypt #$libgcrypt)))
+
+ (gexp->derivation "guix-latest" builder
+ #:modules '((guix build pull)
+ (guix build utils))
+
+ ;; Arrange so that our own (guix build …) modules are
+ ;; used.
+ #:module-path (list (top-source-directory))))
+
+;; 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