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-rw-r--r--gnu/build/activation.scm7
1 files changed, 6 insertions, 1 deletions
diff --git a/gnu/build/activation.scm b/gnu/build/activation.scm
index 04dd19f3e1..16805b9bc6 100644
--- a/gnu/build/activation.scm
+++ b/gnu/build/activation.scm
@@ -236,8 +236,13 @@ copy SOURCE to TARGET."
"Return the '--system' argument passed on the kernel command line."
(find-long-option "--system" (linux-command-line)))
-(define* (activate-current-system #:optional (system (boot-time-system)))
+(define* (activate-current-system
+ #:optional (system (or (getenv "GUIX_NEW_SYSTEM")
+ (boot-time-system))))
"Atomically make SYSTEM the current system."
+ ;; The 'GUIX_NEW_SYSTEM' environment variable is used as a way for 'guix
+ ;; system reconfigure' to pass the file name of the new system.
+
(format #t "making '~a' the current system...~%" system)
;; Atomically make SYSTEM current.