02/10: pack: Warn when building an empty pack.

[guix-commits]

civodul pushed a commit to branch master
in repository guix.

commit 3f8326237df780404c172ef4127195cc20becd66
Author: Ludovic Courtès <address@hidden>
Date:   Tue May 21 14:49:58 2019 +0200

    pack: Warn when building an empty pack.
    
    * guix/scripts/pack.scm (guix-pack): Warn when MANIFEST has zero
    entries.
---
 guix/scripts/pack.scm | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/guix/scripts/pack.scm b/guix/scripts/pack.scm
index 58c6ac6..c17b374 100644
--- a/guix/scripts/pack.scm
+++ b/guix/scripts/pack.scm
@@ -891,6 +891,9 @@ Create a bundle of PACKAGE.\n"))
                  (localstatedir? (assoc-ref opts 'localstatedir?))
                  (profile-name   (assoc-ref opts 'profile-name))
                  (gc-root        (assoc-ref opts 'gc-root)))
+            (when (null? (manifest-entries manifest))
+              (warning (G_ "no packages specified; building an empty pack~%")))
+
             (run-with-store store
               (mlet* %store-monad ((profile (profile-derivation
                                              manifest