publish: Make the cache eviction policy less aggressive.

Suggested by Mark H Weaver <mhw@netris.org>.

* guix/scripts/publish.scm (nar-expiration-time): New procedure.
(render-narinfo/cached): Use it as the #:entry-expiration passed to
'maybe-remove-expired-cache-entries'.

1 files changed, 2 insertions, 1 deletions

diff --git a/doc/guix.texi b/doc/guix.texi
index dbdd9b5ff5..875c1ffa26 100644
--- a/doc/guix.texi
+++ b/doc/guix.texi
@@ -6960,7 +6960,8 @@ guarantee that the store items it provides will indeed remain available
 for as long as @var{ttl}.
 
 Additionally, when @option{--cache} is used, cached entries that have
-not been accessed for @var{ttl} may be deleted.
+not been accessed for @var{ttl} and that no longer have a corresponding
+item in the store, may be deleted.
 
 @item --nar-path=@var{path}
 Use @var{path} as the prefix for the URLs of ``nar'' files