diff options
Diffstat (limited to 'guix/ui.scm')
| -rw-r--r-- | guix/ui.scm | 6 |
1 files changed, 4 insertions, 2 deletions
diff --git a/guix/ui.scm b/guix/ui.scm index 7d1ea2bcbd..7e0c61b4f8 100644 --- a/guix/ui.scm +++ b/guix/ui.scm @@ -118,7 +118,8 @@ General help using GNU software: <http://www.gnu.org/gethelp/>")) (define* (show-what-to-build store drv #:optional dry-run?) "Show what will or would (depending on DRY-RUN?) be built in realizing the -derivations listed in DRV." +derivations listed in DRV. Return #t if there's something to build, #f +otherwise." (let* ((req (append-map (lambda (drv-path) (let ((d (call-with-input-file drv-path read-derivation))) @@ -140,7 +141,8 @@ derivations listed in DRV." (N_ "~:[the following derivation will be built:~%~{ ~a~%~}~;~]" "~:[the following derivations will be built:~%~{ ~a~%~}~;~]" (length req*)) - (null? req*) req*)))) + (null? req*) req*)) + (pair? req*))) (define-syntax with-error-handling (syntax-rules () |