GNU bug report logs - #68741
[PATCH 0/6] Content-addressed downloads from Software Heritage

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From: Ludovic Courtès <ludo <at> gnu.org>
To: 68741 <at> debbugs.gnu.org
Cc: Ludovic Courtès <ludo <at> gnu.org>, Christopher Baines <guix <at> cbaines.net>, Josselin Poiret <dev <at> jpoiret.xyz>, Ludovic Courtès <ludo <at> gnu.org>, Mathieu Othacehe <othacehe <at> gnu.org>, Ricardo Wurmus <rekado <at> elephly.net>, Simon Tournier <zimon.toutoune <at> gmail.com>, Tobias Geerinckx-Rice <me <at> tobias.gr>
Subject: [bug#68741] [PATCH 3/6] swh: Add ‘swh-download-directory-by-nar-hash’.
Date: Fri, 26 Jan 2024 18:25:03 +0100

This allows us to take advantage of content addressing by giving SWH the
expected nar hash.

* guix/swh.scm (swh-download-directory-by-nar-hash): New procedure.

Change-Id: I0494ee15a3cde390a22552de7c2246e0314ba7b5
---
 guix/swh.scm | 24 ++++++++++++++++++++++++
 1 file changed, 24 insertions(+)

diff --git a/guix/swh.scm b/guix/swh.scm
index 60e97c6d38..be1eb7d151 100644
--- a/guix/swh.scm
+++ b/guix/swh.scm
@@ -123,6 +123,7 @@ (define-module (guix swh)
             commit-id?
 
             swh-download-directory
+            swh-download-directory-by-nar-hash
             swh-download))
 
 ;;; Commentary:
@@ -805,3 +806,26 @@ (define* (swh-download url reference output
              "SWH: revision ~s originating from ~a could not be found~%"
              reference url)
      #f)))
+
+(define* (swh-download-directory-by-nar-hash hash algorithm output
+                                             #:key
+                                             (log-port (current-error-port)))
+  "Download from Software Heritage the directory with the given nar HASH for
+ALGORITHM (a symbol such as 'sha256), and unpack it in OUTPUT.  Return #t on
+success and #f on failure.
+
+This procedure uses the \"vault\", which contains \"cooked\" directories in
+the form of tarballs.  If the requested directory is not cooked yet, it will
+wait until it becomes available, which could take several minutes."
+  (match (lookup-directory-by-nar-hash hash algorithm)
+    (#f
+     (format log-port
+             "SWH: directory with nar-~a hash ~a not found~%"
+             algorithm (bytevector->base16-string hash))
+     #f)
+    (swhid
+     (format log-port "SWH: found directory with nar-~a hash ~a at '~a'~%"
+             algorithm (bytevector->base16-string hash) swhid)
+     (swh-download-archive swhid output
+                           #:archive-type 'flat   ;SWHID denotes a directory
+                           #:log-port log-port))))
-- 
2.41.0

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