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+;;; GNU Guix --- Functional package management for GNU
+;;; Copyright © 2019 Pierre Neidhardt <mail@ambrevar.xyz>
+;;; Copyright © 2020 Alex Griffin <a@ajgrf.com>
+;;;
+;;; 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 utils)
+  #:use-module (ice-9 match)
+  #:use-module (ice-9 binary-ports)
+  #:use-module (guix build utils)
+  #:use-module (srfi srfi-26)
+  #:export (64-bit?
+            make-wrapper
+            concatenate-files))
+
+(define (64-bit? file)
+  "Return true if ELF file is in 64-bit format, false otherwise.
+See https://en.wikipedia.org/wiki/Executable_and_Linkable_Format#File_header."
+  (with-input-from-file file
+    (lambda ()
+      (= 2
+         (array-ref (get-bytevector-n (current-input-port) 5) 4)))
+    #:binary #t))
+
+(define* (make-wrapper wrapper real-file #:key (skip-argument-0? #f) #:rest vars)
+  "Like `wrap-program' but create WRAPPER around REAL-FILE.
+The wrapper automatically changes directory to that of REAL-FILE.
+
+Example:
+
+  (make-wrapper \"bin/foo\" \"sub-dir/original-foo\"
+                '(\"PATH\" \":\" = (\"/gnu/.../bar/bin\"))
+                '(\"CERT_PATH\" suffix (\"/gnu/.../baz/certs\"
+                                        \"/qux/certs\")))
+
+will create 'bin/foo' with the following
+contents:
+
+  #!location/of/bin/bash
+  export PATH=\"/gnu/.../bar/bin\"
+  export CERT_PATH=\"$CERT_PATH${CERT_PATH:+:}/gnu/.../baz/certs:/qux/certs\"
+  cd sub-dir
+  exec -a $0 sub-dir/original-foo \"$@\"."
+  (define (export-variable lst)
+    ;; Return a string that exports an environment variable.
+    (match lst
+      ((var sep '= rest)
+       (format #f "export ~a=\"~a\""
+               var (string-join rest sep)))
+      ((var sep 'prefix rest)
+       (format #f "export ~a=\"~a${~a:+~a}$~a\""
+               var (string-join rest sep) var sep var))
+      ((var sep 'suffix rest)
+       (format #f "export ~a=\"$~a${~a+~a}~a\""
+               var var var sep (string-join rest sep)))
+      ((var '= rest)
+       (format #f "export ~a=\"~a\""
+               var (string-join rest ":")))
+      ((var 'prefix rest)
+       (format #f "export ~a=\"~a${~a:+:}$~a\""
+               var (string-join rest ":") var var))
+      ((var 'suffix rest)
+       (format #f "export ~a=\"$~a${~a:+:}~a\""
+               var var var (string-join rest ":")))))
+
+  (define (remove-keyword-arguments lst)
+    (match lst
+      (() '())
+      (((? keyword? _) _ lst ...)
+       (remove-keyword-arguments lst))
+      (_ lst)))
+
+  (mkdir-p (dirname wrapper))
+  (call-with-output-file wrapper
+    (lambda (port)
+      (format port
+              (if skip-argument-0?
+                  "#!~a~%~a~%cd \"~a\"~%exec \"~a\" \"$@\"~%"
+                  "#!~a~%~a~%cd \"~a\"~%exec -a \"$0\" \"~a\" \"$@\"~%")
+              (which "bash")
+              (string-join
+                (map export-variable (remove-keyword-arguments vars))
+                "\n")
+              (dirname real-file)
+              (canonicalize-path real-file))))
+  (chmod wrapper #o755))
+
+(define (concatenate-files files result)
+  "Make RESULT the concatenation of all of FILES."
+  (define (dump file port)
+    (put-bytevector
+     port
+     (call-with-input-file file
+       get-bytevector-all)))
+
+  (call-with-output-file result
+    (lambda (port)
+      (for-each (cut dump <> port) files))))