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-rw-r--r--gnu/build/marionette.scm17
1 files changed, 17 insertions, 0 deletions
diff --git a/gnu/build/marionette.scm b/gnu/build/marionette.scm
index 941461a72c..08de7940e3 100644
--- a/gnu/build/marionette.scm
+++ b/gnu/build/marionette.scm
@@ -375,6 +375,23 @@ to actual keystrokes."
(lambda (runner)
(let ((success? (= (test-runner-fail-count runner) 0)))
(test-on-final-simple runner)
+
+ (when (not success?)
+ (let* ((log-port (test-runner-aux-value runner))
+ (log-file (port-filename log-port)))
+ (format (current-error-port)
+ "\nTests failed, dumping log file '~a'.\n\n"
+ log-file)
+
+ ;; At this point LOG-PORT is not closed yet; flush it.
+ (force-output log-port)
+
+ ;; Brute force to avoid dependency on (guix build utils) for
+ ;; 'dump-port'.
+ (let ((content (call-with-input-file log-file
+ get-bytevector-all)))
+ (put-bytevector (current-error-port) content))))
+
(exit success?))))
runner))