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-rw-r--r--gnu/packages/bootloaders.scm13
1 files changed, 7 insertions, 6 deletions
diff --git a/gnu/packages/bootloaders.scm b/gnu/packages/bootloaders.scm
index 7034085d67..e3e49288ad 100644
--- a/gnu/packages/bootloaders.scm
+++ b/gnu/packages/bootloaders.scm
@@ -6,7 +6,7 @@
;;; Copyright © 2016, 2017, 2018 Marius Bakke <mbakke@fastmail.com>
;;; Copyright © 2016, 2017 Danny Milosavljevic <dannym@scratchpost.org>
;;; Copyright © 2016, 2017 David Craven <david@craven.ch>
-;;; Copyright © 2017, 2018 Efraim Flashner <efraim@flashner.co.il>
+;;; Copyright © 2017, 2018, 2020 Efraim Flashner <efraim@flashner.co.il>
;;; Copyright © 2018, 2019, 2020 Tobias Geerinckx-Rice <me@tobias.gr>
;;; Copyright © 2019 nee <nee@cock.li>
;;; Copyright © 2019 Mathieu Othacehe <m.othacehe@gmail.com>
@@ -115,11 +115,12 @@
;; determine the root file system when it's a RAID
;; device. Failing to do that, 'grub-probe' silently
;; fails if 'mdadm' is not in $PATH.
- (substitute* "grub-core/osdep/linux/getroot.c"
- (("argv\\[0\\] = \"mdadm\"")
- (string-append "argv[0] = \""
- (assoc-ref inputs "mdadm")
- "/sbin/mdadm\"")))
+ (when (assoc-ref inputs "mdadm")
+ (substitute* "grub-core/osdep/linux/getroot.c"
+ (("argv\\[0\\] = \"mdadm\"")
+ (string-append "argv[0] = \""
+ (assoc-ref inputs "mdadm")
+ "/sbin/mdadm\""))))
;; Make the font visible.
(copy-file (assoc-ref (or native-inputs inputs)