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+;;; GNU Guix --- Functional package management for GNU
+;;; Copyright © 2020 Andrew Whatson <whatson@gmail.com>
+;;;
+;;; This file is NOT part of GNU Guix.
+;;;
+;;; This program 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.
+;;;
+;;; This program 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 this program. If not, see <http://www.gnu.org/licenses/>.
+
+(define-module (crn packages)
+ #:use-module ((gnu packages) #:prefix gnu:)
+ #:use-module (guix diagnostics)
+ #:use-module (guix i18n)
+ #:use-module (srfi srfi-1)
+ #:export (search-patch
+ search-patches
+ %patch-path))
+
+(define (search-patch file-name)
+ "Search the patch FILE-NAME. Raise an error if not found."
+ (or (search-path (%patch-path) file-name)
+ (raise (formatted-message (G_ "~a: patch not found")
+ file-name))))
+
+(define-syntax-rule (search-patches file-name ...)
+ "Return the list of absolute file names corresponding to each
+FILE-NAME found in %PATCH-PATH."
+ (list (search-patch file-name) ...))
+
+(define %channel-root
+ (find (lambda (path)
+ (file-exists? (string-append path "/crn/packages.scm")))
+ %load-path))
+
+(define %patch-path
+ (make-parameter
+ (cons
+ (string-append %channel-root "/crn/packages/patches")
+ (gnu:%patch-path))))