GNU bug report logs - #64708
[PATCH 0/8] Fix cross build and native build for the Hurd.

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From: Janneke Nieuwenhuizen <janneke <at> gnu.org>
To: 64708 <at> debbugs.gnu.org
Cc: Ludovic Courtès <ludo <at> gnu.org>
Subject: [bug#64708] [PATCH 3/8] gnu: commencement: Add git-fetch-from-tarball utility.
Date: Tue, 18 Jul 2023 15:14:59 +0200

From: Ludovic Courtès <ludo <at> gnu.org>

* gnu/packages/commencement.scm (git-fetch-from-tarball): New procedure.
---
 gnu/packages/commencement.scm | 31 +++++++++++++++++++++++++++++++
 1 file changed, 31 insertions(+)

diff --git a/gnu/packages/commencement.scm b/gnu/packages/commencement.scm
index d0603e62c8..1d69c2a80f 100644
--- a/gnu/packages/commencement.scm
+++ b/gnu/packages/commencement.scm
@@ -57,7 +57,10 @@ (define-module (gnu packages commencement)
   #:use-module (gnu packages xml)
   #:use-module (guix gexp)
   #:use-module (guix packages)
+  #:use-module ((guix store) #:select (%store-monad))
+  #:use-module (guix monads)
   #:use-module (guix download)
+  #:use-module ((guix git-download) #:select (git-reference git-file-name))
   #:use-module (guix build-system gnu)
   #:use-module (guix build-system trivial)
   #:use-module ((guix licenses) #:prefix license:)
@@ -90,6 +93,34 @@ (define-module (gnu packages commencement)
 ;;;
 ;;; Code:
 
+(define* (git-fetch-from-tarball tarball)
+  (lambda* (url hash-algo hash
+                #:optional name
+                #:key (system (%current-system))
+                (guile %bootstrap-guile))
+    (mlet %store-monad ((guile (package->derivation guile system)))
+      (gexp->derivation
+       (or name "git-checkout")
+       (with-imported-modules '((guix build utils))
+         #~(begin
+             (use-modules (guix build utils)
+                          (ice-9 ftw)
+                          (ice-9 match))
+             (setenv "PATH"
+                     #+(file-append %bootstrap-coreutils&co "/bin"))
+             (invoke (string-append #+tar "/bin/tar")
+                     "xf" #$tarball)
+             (match (scandir ".")
+               (("." ".." directory)
+                (copy-recursively directory #$output)))))
+       #:recursive? #t
+       #:hash-algo hash-algo
+       #:hash hash
+       #:system system
+       #:guile-for-build guile
+       #:graft? #f
+       #:local-build? #t))))
+
 (define bootar
   (package
     (name "bootar")
-- 
2.40.1

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