gnu: %find-package: Allow supressing supersession info.

The use case is to implement package aliasing on top of the existing
superseding mechanism.

* gnu/packages.scm (%find-package): Supress supersession info when package has
‘supress-supersession-info’ property.

Change-Id: Ia1077118dad0133f91575a5a70238618f2475300
Merges: #7407

1 files changed, 3 insertions, 2 deletions

diff --git a/gnu/packages.scm b/gnu/packages.scm
index ee99dea2cab..d859feadf62 100644
--- a/gnu/packages.scm
+++ b/gnu/packages.scm
@@ -518,8 +518,9 @@ return its return value."
                 (location->string (package-location pkg))))
      (match (package-superseded pkg)
        ((? package? new)
-        (info (G_ "package '~a' has been superseded by '~a'~%")
-              (package-name pkg) (package-name new))
+        (unless (assoc-ref (package-properties pkg) 'supress-supersession-info?)
+          (info (G_ "package '~a' has been superseded by '~a'~%")
+                (package-name pkg) (package-name new)))
         new)
        (#f
         pkg)))