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+;;; GNU Guix --- Functional package management for GNU
+;;; Copyright © 2018 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/>.
+
+;; Build Guix using Guix.
+
+(use-modules (srfi srfi-26))
+
+;; Add ~/.config/guix/latest to the search path.
+(add-to-load-path
+ (and=> (or (getenv "XDG_CONFIG_HOME")
+ (and=> (getenv "HOME")
+ (cut string-append <> "/.config")))
+ (cut string-append <> "/guix/latest")))
+
+(use-modules (guix) (guix ui)
+ (guix git-download)
+ (ice-9 match))
+
+(match (command-line)
+ ((program source)
+ (with-error-handling
+ (with-store store
+ (let* ((script (string-append source "/build-aux/build-self.scm"))
+ (build (primitive-load script))
+ (git? (git-predicate source)))
+ (run-with-store store
+ ;; TODO: Extract #:version and #:commit using Guile-Git.
+ (mlet* %store-monad ((source (interned-file source "guix-source"
+ #:select? git?
+ #:recursive? #t))
+ (drv (build source)))
+ (mbegin %store-monad
+ (show-what-to-build* (list drv))
+ (built-derivations (list drv))
+ (with-monad %store-monad
+ (display (derivation->output-path drv))
+ (newline)
+ (return drv))))))))))