[bug#74654] [PATCH 5/5] maint: Add ungrafting manifest.

["Ludovic Courtès" <ludo@gnu.org>]

* etc/manifests/ungraft.scm: New file.
* Makefile.am (EXTRA_DIST): Add it.

Change-Id: If4aa7649721b93d3297ecd967d5db4a6b71ec6eb
---
 Makefile.am               |  1 +
 etc/manifests/ungraft.scm | 49 +++++++++++++++++++++++++++++++++++++++
 2 files changed, 50 insertions(+)
 create mode 100644 etc/manifests/ungraft.scm

diff --git a/Makefile.am b/Makefile.am
index 8c763c68aa..d0d195636b 100644
--- a/Makefile.am
+++ b/Makefile.am
@@ -743,6 +743,7 @@ EXTRA_DIST +=						\
   etc/manifests/source.scm				\
   etc/manifests/system-tests.scm			\
   etc/manifests/time-travel.scm				\
+  etc/manifests/ungraft.scm				\
   etc/manifests/upgrade.scm				\
   scripts/guix.in					\
   tests/cve-sample.json					\
diff --git a/etc/manifests/ungraft.scm b/etc/manifests/ungraft.scm
new file mode 100644
index 0000000000..3e42b98ece
--- /dev/null
+++ b/etc/manifests/ungraft.scm
@@ -0,0 +1,49 @@
+;;; GNU Guix --- Functional package management for GNU
+;;; Copyright © 2024 Ludovic Courtès <ludo@gnu.org>
+;;;
+;;; This file is part of GNU Guix.
+;;;
+;;; GNU Guix is free software; you can redistribute it and/or modify it
+;;; under the terms of the GNU General Public License as published by
+;;; the Free Software Foundation; either version 3 of the License, or (at
+;;; your option) any later version.
+;;;
+;;; GNU Guix is distributed in the hope that it will be useful, but
+;;; WITHOUT ANY WARRANTY; without even the implied warranty of
+;;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+;;; GNU General Public License for more details.
+;;;
+;;; You should have received a copy of the GNU General Public License
+;;; along with GNU Guix.  If not, see <http://www.gnu.org/licenses/>.
+
+;; This manifest "ungrafts" all the currently grafted packages and returns
+;; said packages and all their dependents.
+
+(use-modules (guix diagnostics)
+             (guix i18n)
+             (guix packages)
+             (guix profiles)
+             (guix store)
+             ((guix scripts build) #:select (dependents))
+             ((gnu packages) #:select (all-packages))
+             (srfi srfi-1))
+
+(define (grafted-packages)
+  (info (G_ "enumerating grafted packages...~%"))
+  (let ((result (filter package-replacement (all-packages))))
+    (info (G_ "found ~d grafted packages:~{ ~a~}~%")
+          (length result) (map package-full-name result))
+    result))
+
+(manifest
+ (with-store store
+   (let* ((grafted (grafted-packages))
+          (ungraft-all (package-input-rewriting
+                        (map (lambda (package)
+                               `(,package . ,(package-replacement package)))
+                             grafted))))
+     (map (lambda (package)
+            (manifest-entry
+              (inherit (package->manifest-entry (ungraft-all package)))
+              (name (string-append (package-name package) "-ungrafted"))))
+          (dependents store grafted)))))
-- 
2.46.0