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+;;; GNU Guix --- Functional package management for GNU
+;;; Copyright © 2019 Julien Lepiller <julien@lepiller.eu>
+;;;
+;;; This file is not 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 (nonguix build binary-build-system)
+  #:use-module ((guix build gnu-build-system) #:prefix gnu:)
+  #:use-module (nonguix build utils)
+  #:use-module (guix build utils)
+  #:use-module (ice-9 match)
+  #:export (%standard-phases
+            binary-build))
+
+;; Commentary:
+;;
+;; Builder-side code of the standard binary build procedure.
+;;
+;; Code:
+
+(define* (install #:key install-plan outputs #:allow-other-keys)
+  "Copy files from the \"source\" build input to the \"out\" output according to INSTALL-PLAN.
+
+An INSTALL-PLAN is made of three elements:
+
+- A source path which is a file or directory from the \"source\" build input.
+- Patterns of the files to copy (only useful if the source path is a directory).
+- The target destination.
+
+If the target ends with a slash, it represents the target directory.  If not, it
+represent the target full path, which only makes sense for single files."
+  (define (install-file file target)
+    (let ((target (string-append (assoc-ref outputs "out")
+                                 "/" target
+                                 (if (string-suffix? "/" target)
+                                     (string-append "/" file)
+                                     ""))))
+      (mkdir-p (dirname target))
+      (copy-file file target)))
+
+  (define (install-file-pattern pattern target)
+    (for-each
+      (lambda (file)
+        (install-file file target))
+      (find-files "." pattern)))
+
+  (define (install plan)
+    (match plan
+      ((file-or-directory files target)
+       (if (file-is-directory? file-or-directory)
+           (with-directory-excursion file-or-directory
+             (for-each
+              (lambda (pattern)
+                (install-file-pattern pattern target))
+              files))
+           (install-file file-or-directory target)))))
+
+  (for-each install install-plan)
+  #t)
+
+(define* (patchelf #:key inputs outputs patchelf-plan #:allow-other-keys)
+  "Set the interpreter and the RPATH of files as per the PATCHELF-PLAN.
+
+The PATCHELF-PLAN elements are lists of:
+
+- The file to patch.
+- The inputs (as strings) to include in the rpath, e.g. \"mesa\".
+
+Both executables and dynamic libraries are accepted.
+The inputs are optional when the file is an executable."
+  (define (binary-patch binary interpreter runpath)
+    (unless (string-contains binary ".so")
+      (invoke "patchelf" "--set-interpreter" interpreter binary))
+    (when runpath
+      (let ((rpath (string-join
+                    (map
+                     (lambda (input-or-output)
+                       (cond
+                        ((assoc-ref outputs input-or-output)
+                         (string-append (assoc-ref outputs input-or-output) "/lib"))
+                        ((assoc-ref inputs input-or-output)
+                         (string-append (assoc-ref inputs input-or-output) "/lib"))
+                        (else (error (format #f "`~a' not found among the inputs nor the outputs." input-or-output)))))
+                     runpath)
+                    ":")))
+        (invoke "patchelf" "--set-rpath" rpath binary)))
+    #t)
+  (let ((interpreter (car (find-files (assoc-ref inputs "libc") "ld-linux.*\\.so")))
+        (interpreter32 (car (find-files (assoc-ref inputs "libc32") "ld-linux.*\\.so"))))
+    (for-each
+      (lambda (plan)
+        (match plan
+          ((binary runpath)
+           (binary-patch binary (if (64-bit? binary)
+                                    interpreter
+                                    interpreter32)
+                         runpath))
+          ((binary)
+           (binary-patch binary (if (64-bit? binary)
+                                    interpreter
+                                    interpreter32)
+                         #f))))
+      patchelf-plan))
+  #t)
+
+(define %standard-phases
+  ;; Everything is as with the GNU Build System except for the `configure'
+  ;; , `build', `check' and `install' phases.
+  (modify-phases gnu:%standard-phases
+    (delete 'bootstrap)
+    (delete 'configure)
+    (delete 'build)
+    (delete 'check)
+    (add-before 'install 'patchelf patchelf)
+    (replace 'install install)))
+
+(define* (binary-build #:key inputs (phases %standard-phases)
+                      #:allow-other-keys #:rest args)
+  "Build the given package, applying all of PHASES in order."
+  (apply gnu:gnu-build #:inputs inputs #:phases phases args))
+
+;;; binary-build-system.scm ends here