11/16: ui: 'build-notifier' invokes continuation when there's nothing to do.

[guix-commits]

civodul pushed a commit to branch master
in repository guix.

commit 9b771305df5dfc31c06b81fbdeaae753ba5d4afe
Author: Ludovic Courtès <address@hidden>
AuthorDate: Sun Mar 22 11:53:21 2020 +0100

    ui: 'build-notifier' invokes continuation when there's nothing to do.
    
    * guix/ui.scm (build-notifier): Call CONTINUE when there's nothing to
    build or download, even when DRY-RUN? is true.
---
 guix/ui.scm | 15 +++++++++------
 1 file changed, 9 insertions(+), 6 deletions(-)

diff --git a/guix/ui.scm b/guix/ui.scm
index 1c0dd11..b9ba8c0 100644
--- a/guix/ui.scm
+++ b/guix/ui.scm
@@ -1078,12 +1078,15 @@ any build happening."
                      #f))
                   things))
 
-    (show-what-to-build store inputs
-                        #:dry-run? dry-run?
-                        #:use-substitutes? use-substitutes?
-                        #:mode mode)
-    (unless dry-run?
-      (continue #t))))
+    (let-values (((build? download?)
+                  (show-what-to-build store inputs
+                                      #:dry-run? dry-run?
+                                      #:use-substitutes? use-substitutes?
+                                      #:mode mode)))
+
+      (unless (and (or build? download?)
+                   dry-run?)
+        (continue #t)))))
 
 (define (right-arrow port)
   "Return either a string containing the 'RIGHT ARROW' character, or an ASCII