[bug#69328] [PATCH v2 07/12] hg-download: Use ‘swh-download-directory-by-nar-hash’.

[Ludovic Courtès]

This allows content-addressed access to the checkout, which is
preferable.

* guix/hg-download.scm (hg-fetch): Add call to
‘swh-download-directory-by-nar-hash’ before ‘swh-download’ call.

Change-Id: I2afc8badc1f8bb2c8bdd3a47abbb72d455d93e64
---
 guix/hg-download.scm | 10 ++++++----
 1 file changed, 6 insertions(+), 4 deletions(-)

diff --git a/guix/hg-download.scm b/guix/hg-download.scm
index 6d02de47e4..dd28d9c244 100644
--- a/guix/hg-download.scm
+++ b/guix/hg-download.scm
@@ -1,5 +1,5 @@
 ;;; GNU Guix --- Functional package management for GNU
-;;; Copyright © 2014, 2015, 2016, 2017, 2019 Ludovic Courtès <ludo@gnu.org>
+;;; Copyright © 2014-2017, 2019, 2024 Ludovic Courtès <ludo@gnu.org>
 ;;; Copyright © 2016 Ricardo Wurmus <rekado@elephly.net>
 ;;; Copyright © 2021 Xinglu Chen <public@yoctocell.xyz>
 ;;;
@@ -117,9 +117,11 @@ (define* (hg-fetch ref hash-algo hash
                 (parameterize ((%verify-swh-certificate? #f))
                   (format (current-error-port)
                           "Trying to download from Software Heritage...~%")
-                  (swh-download #$(hg-reference-url ref)
-                                #$(hg-reference-changeset ref)
-                                #$output)))))))
+                  (or (swh-download-directory-by-nar-hash #$hash '#$hash-algo
+                                                          #$output)
+                      (swh-download #$(hg-reference-url ref)
+                                    #$(hg-reference-changeset ref)
+                                    #$output))))))))
 
   (mlet %store-monad ((guile (package->derivation guile system)))
     (gexp->derivation (or name "hg-checkout") build
-- 
2.41.0