[bug#48826] [PATCH] scripts: substitute: Cache connection when looking for narinfos.

[Mathieu Othacehe]

The process-substitution procedure is opening two distinct connections. The
first one when looking for narinfo by calling lookup-narinfo and the other one
when fetching nar files.

Cache the connection when looking for narinfos so that process-substitution
only opens one connection.

* guix/scripts/substitute.scm (lookup-narinfo): Cache connection by using
open-connection-for-uri/cached.
---
 guix/scripts/substitute.scm | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/guix/scripts/substitute.scm b/guix/scripts/substitute.scm
index 54311c3e08..44448ff3e9 100755
--- a/guix/scripts/substitute.scm
+++ b/guix/scripts/substitute.scm
@@ -163,7 +163,9 @@ if file doesn't exist, and the narinfo otherwise."
 (define (lookup-narinfo caches path authorized?)
   "Return the narinfo for PATH in CACHES, or #f when no substitute for PATH
 was found."
-  (match (lookup-narinfos/diverse caches (list path) authorized?)
+  (match (lookup-narinfos/diverse
+          caches (list path) authorized?
+          #:open-connection open-connection-for-uri/cached)
     ((answer) answer)
     (_        #f)))
 
-- 
2.31.1