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+;;; GNU Guix --- Functional package management for GNU
+;;; Copyright © 2019 Julien Lepiller <julien@lepiller.eu>
+;;; Copyright © 2020 Pierre Neidhardt <mail@ambrevar.xyz>
+;;;
+;;; 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 copy)
+  #:use-module (guix store)
+  #: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)
+  #:use-module (srfi srfi-1)
+  #:export (%copy-build-system-modules
+            default-glibc
+            lower
+            copy-build
+            copy-build-system))
+
+;; Commentary:
+;;
+;; Standard build procedure for simple packages that don't require much
+;; compilation, mostly just copying files around.  This is implemented as an
+;; extension of `gnu-build-system'.
+;;
+;; Code:
+
+(define %copy-build-system-modules
+  ;; Build-side modules imported by default.
+  `((guix build copy-build-system)
+    ,@%gnu-build-system-modules))
+
+(define (default-glibc)
+  "Return the default glibc package."
+  ;; Do not use `@' to avoid introducing circular dependencies.
+  (let ((module (resolve-interface '(gnu packages base))))
+    (module-ref module 'glibc)))
+
+(define* (lower name
+                #:key source inputs native-inputs outputs system target
+                (glibc (default-glibc))
+                #:allow-other-keys
+                #:rest arguments)
+  "Return a bag for NAME from the given arguments."
+  (define private-keywords
+    '(#:source #:target #:inputs #:native-inputs))
+
+  (bag
+    (name name)
+    (system system)
+    (host-inputs `(,@(if source
+                         `(("source" ,source))
+                         '())
+                   ,@inputs
+                   ;; Keep the standard inputs of 'gnu-build-system'.
+                   ,@(standard-packages)))
+    (build-inputs native-inputs)
+    (outputs outputs)
+    (build copy-build)
+    (arguments (strip-keyword-arguments private-keywords arguments))))
+
+(define* (copy-build store name inputs
+                     #:key (guile #f)
+                     (outputs '("out"))
+                     (install-plan ''(("." (".") "./")))
+                     (search-paths '())
+                     (out-of-source? #t)
+                     (validate-runpath? #t)
+                     (patch-shebangs? #t)
+                     (strip-binaries? #t)
+                     (strip-flags ''("--strip-debug"))
+                     (strip-directories ''("lib" "lib64" "libexec"
+                                           "bin" "sbin"))
+                     (phases '(@ (guix build copy-build-system)
+                                 %standard-phases))
+                     (system (%current-system))
+                     (imported-modules %copy-build-system-modules)
+                     (modules '((guix build copy-build-system)
+                                (guix build utils))))
+  "Build SOURCE using INSTALL-PLAN, and with INPUTS."
+  (define builder
+    `(begin
+       (use-modules ,@modules)
+       (copy-build #:source ,(match (assoc-ref inputs "source")
+                               (((?  derivation? source))
+                                (derivation->output-path source))
+                               ((source)
+                                source)
+                               (source
+                                source))
+                   #:system ,system
+                   #:outputs %outputs
+                   #:inputs %build-inputs
+                   #:install-plan ,install-plan
+                   #:search-paths ',(map search-path-specification->sexp
+                                         search-paths)
+                   #:phases ,phases
+                   #:out-of-source? ,out-of-source?
+                   #:validate-runpath? ,validate-runpath?
+                   #:patch-shebangs? ,patch-shebangs?
+                   #:strip-binaries? ,strip-binaries?
+                   #:strip-flags ,strip-flags
+                   #:strip-directories ,strip-directories)))
+
+  (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
+                                #:system system
+                                #:inputs inputs
+                                #:modules imported-modules
+                                #:outputs outputs
+                                #:guile-for-build guile-for-build))
+
+(define copy-build-system
+  (build-system
+    (name 'copy)
+    (description "The standard copy build system")
+    (lower lower)))
+
+;;; copy.scm ends here