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-rw-r--r--gnu/build/marionette.scm24
1 files changed, 14 insertions, 10 deletions
diff --git a/gnu/build/marionette.scm b/gnu/build/marionette.scm
index 424f2b6713..789dab3ca0 100644
--- a/gnu/build/marionette.scm
+++ b/gnu/build/marionette.scm
@@ -168,16 +168,20 @@ QEMU monitor and to the guest's backdoor REPL."
(define* (wait-for-file file marionette #:key (timeout 10))
"Wait until FILE exists in MARIONETTE; 'read' its content and return it. If
FILE has not shown up after TIMEOUT seconds, raise an error."
- (marionette-eval
- `(let loop ((i ,timeout))
- (cond ((file-exists? ,file)
- (call-with-input-file ,file read))
- ((> i 0)
- (sleep 1)
- (loop (- i 1)))
- (else
- (error "file didn't show up" ,file))))
- marionette))
+ (match (marionette-eval
+ `(let loop ((i ,timeout))
+ (cond ((file-exists? ,file)
+ (cons 'success (call-with-input-file ,file read)))
+ ((> i 0)
+ (sleep 1)
+ (loop (- i 1)))
+ (else
+ 'failure)))
+ marionette)
+ (('success . result)
+ result)
+ ('failure
+ (error "file didn't show up" file))))
(define (marionette-control command marionette)
"Run COMMAND in the QEMU monitor of MARIONETTE. COMMAND is a string such as