[bug#48560] [PATCH 4/4] scripts: substitute: Add keep-alive support when reading NAR.

[Mathieu Othacehe <othacehe@gnu.org>]

* guix/scripts/substitute.scm (process-substitution): Pass the download size
to the progress-report-port procedure so that it doesn't block reading from
the input port when keep-alive is supported.
---
 guix/scripts/substitute.scm | 7 +++++--
 1 file changed, 5 insertions(+), 2 deletions(-)

diff --git a/guix/scripts/substitute.scm b/guix/scripts/substitute.scm
index 8e4eae00b3..54311c3e08 100755
--- a/guix/scripts/substitute.scm
+++ b/guix/scripts/substitute.scm
@@ -518,8 +518,11 @@ PORT."
                                          (current-error-port)
                                          #:abbreviation nar-uri-abbreviation))))
                      ;; Keep RAW open upon completion so we can later reuse
-                     ;; the underlying connection.
-                     (progress-report-port reporter raw #:close? #f)))
+                     ;; the underlying connection.  Pass the download size so
+                     ;; that this procedure won't block reading from RAW.
+                     (progress-report-port reporter raw
+                                           #:close? #f
+                                           #:download-size dl-size)))
                   ((input pids)
                    ;; NOTE: This 'progress' port of current process will be
                    ;; closed here, while the child process doing the
-- 
2.31.1