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-rw-r--r--gnu/build/linux-boot.scm5
1 files changed, 3 insertions, 2 deletions
diff --git a/gnu/build/linux-boot.scm b/gnu/build/linux-boot.scm
index ea1971ff9c..fa6f417907 100644
--- a/gnu/build/linux-boot.scm
+++ b/gnu/build/linux-boot.scm
@@ -400,8 +400,9 @@ to it are lost."
(when (procedure? pre-mount)
;; Do whatever actions are needed before mounting--e.g., installing
- ;; device mappings.
- (pre-mount))
+ ;; device mappings. Error out when the return value is false.
+ (unless (pre-mount)
+ (error "pre-mount actions failed")))
;; Mount the specified file systems.
(for-each mount-file-system