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+;;; GNU Guix --- Functional package management for GNU
+;;; Copyright © 2016 Petter <petter@mykolab.ch>
+;;; Copyright © 2017 Leo Famulari <leo@famulari.name>
+;;;
+;;; 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 (guix build-system go)
+  #:use-module (guix utils)
+  #:use-module (guix derivations)
+  #:use-module (guix search-paths)
+  #:use-module (guix build-system)
+  #:use-module (guix build-system gnu)
+  #:use-module (guix packages)
+  #:use-module (ice-9 match)
+  #:export (%go-build-system-modules
+            go-build
+            go-build-system))
+
+;; Commentary:
+;;
+;; Standard build procedure for packages using the Go build system.  It is
+;; implemented as an extension of 'gnu-build-system'.
+;;
+;; Code:
+
+(define %go-build-system-modules
+  ;; Build-side modules imported and used by default.
+  `((guix build go-build-system)
+    ,@%gnu-build-system-modules))
+
+(define (default-go)
+  ;; Lazily resolve the binding to avoid a circular dependency.
+  (let ((go (resolve-interface '(gnu packages golang))))
+    (module-ref go 'go)))
+
+(define* (lower name
+                #:key source inputs native-inputs outputs system target
+                (go (default-go))
+                #:allow-other-keys
+                #:rest arguments)
+  "Return a bag for NAME."
+  (define private-keywords
+    '(#:source #:target #:go #:inputs #:native-inputs))
+
+  (and (not target)                               ;XXX: no cross-compilation
+       (bag
+         (name name)
+         (system system)
+         (host-inputs `(,@(if source
+                              `(("source" ,source))
+                              '())
+                        ,@inputs
+
+                        ;; Keep the standard inputs of 'gnu-build-system'.
+                        ,@(standard-packages)))
+         (build-inputs `(("go" ,go)
+                         ,@native-inputs))
+         (outputs outputs)
+         (build go-build)
+         (arguments (strip-keyword-arguments private-keywords arguments)))))
+
+(define* (go-build store name inputs
+                   #:key
+                   (phases '(@ (guix build go-build-system)
+                               %standard-phases))
+                   (outputs '("out"))
+                   (search-paths '())
+                   (import-path "")
+                   (unpack-path "")
+                   (tests? #t)
+                   (system (%current-system))
+                   (guile #f)
+                   (imported-modules %go-build-system-modules)
+                   (modules '((guix build go-build-system)
+                              (guix build utils))))
+  (define builder
+   `(begin
+      (use-modules ,@modules)
+      (go-build #:name ,name
+                #:source ,(match (assoc-ref inputs "source")
+                                 (((? derivation? source))
+                                  (derivation->output-path source))
+                                 ((source)
+                                  source)
+                                 (source
+                                  source))
+                #:system ,system
+                #:phases ,phases
+                #:outputs %outputs
+                #:search-paths ',(map search-path-specification->sexp
+                                      search-paths)
+                #:import-path ,import-path
+                #:unpack-path ,unpack-path
+                #:tests? ,tests?
+                #:inputs %build-inputs)))
+
+  (define guile-for-build
+    (match guile
+      ((? package?)
+       (package-derivation store guile system #:graft? #f))
+      (#f                                         ; the default
+       (let* ((distro (resolve-interface '(gnu packages commencement)))
+              (guile  (module-ref distro 'guile-final)))
+         (package-derivation store guile system
+                             #:graft? #f)))))
+
+  (build-expression->derivation store name builder
+                                #:inputs inputs
+                                #:system system
+                                #:modules imported-modules
+                                #:outputs outputs
+                                #:guile-for-build guile-for-build))
+
+(define go-build-system
+  (build-system
+    (name 'go)
+    (description
+     "Build system for Go programs")
+    (lower lower)))