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-rw-r--r--guix/build/graft.scm21
1 files changed, 19 insertions, 2 deletions
diff --git a/guix/build/graft.scm b/guix/build/graft.scm
index e567bff4f4..8d79e8a50e 100644
--- a/guix/build/graft.scm
+++ b/guix/build/graft.scm
@@ -1,5 +1,5 @@
;;; GNU Guix --- Functional package management for GNU
-;;; Copyright © 2014, 2015, 2016 Ludovic Courtès <ludo@gnu.org>
+;;; Copyright © 2014, 2015, 2016, 2018 Ludovic Courtès <ludo@gnu.org>
;;; Copyright © 2016 Mark H Weaver <mhw@netris.org>
;;;
;;; This file is part of GNU Guix.
@@ -27,7 +27,8 @@
#:use-module (srfi srfi-1) ; list library
#:use-module (srfi srfi-26) ; cut and cute
#:export (replace-store-references
- rewrite-directory))
+ rewrite-directory
+ graft))
;;; Commentary:
;;;
@@ -321,4 +322,20 @@ file name pairs."
#:directories? #t))
(rename-matching-files output mapping))
+(define* (graft old-outputs new-outputs mapping
+ #:key (log-port (current-output-port)))
+ "Apply the grafts described by MAPPING on OLD-OUTPUTS, leading to
+NEW-OUTPUTS. MAPPING must be a list of file name pairs; OLD-OUTPUTS and
+NEW-OUTPUTS are lists of output name/file name pairs."
+ (for-each (lambda (input output)
+ (format log-port "grafting '~a' -> '~a'...~%" input output)
+ (force-output)
+ (rewrite-directory input output mapping))
+ (match old-outputs
+ (((names . files) ...)
+ files))
+ (match new-outputs
+ (((names . files) ...)
+ files))))
+
;;; graft.scm ends here