03/11: Revert "guix system: Remove unused 'read-operating-system' procedure."

[guix-commits]

civodul pushed a commit to branch master
in repository guix.

commit 22b9734b67b8f5946e09ed28843a9af26f345945
Author: Ludovic Courtès <ludo@gnu.org>
AuthorDate: Tue Oct 11 13:56:02 2022 +0200

    Revert "guix system: Remove unused 'read-operating-system' procedure."
    
    This reverts commit d11a432adffe9308eafec6b77cddd3145029109e.
    
    The 'read-operating-system' is used in Emacs-Guix.
---
 gnu/ci.scm              | 1 +
 guix/scripts/system.scm | 6 ++++++
 2 files changed, 7 insertions(+)

diff --git a/gnu/ci.scm b/gnu/ci.scm
index 19a48bdbf1..884dd84469 100644
--- a/gnu/ci.scm
+++ b/gnu/ci.scm
@@ -38,6 +38,7 @@
   #:use-module ((guix licenses)
                 #:select (gpl3+ license? license-name))
   #:use-module ((guix utils) #:select (%current-system))
+  #:use-module ((guix scripts system) #:select (read-operating-system))
   #:use-module ((guix scripts pack)
                 #:select (self-contained-tarball))
   #:use-module (gnu bootloader)
diff --git a/guix/scripts/system.scm b/guix/scripts/system.scm
index 4bcf789703..560f56408c 100644
--- a/guix/scripts/system.scm
+++ b/guix/scripts/system.scm
@@ -92,6 +92,7 @@
   #:use-module (ice-9 match)
   #:use-module (rnrs bytevectors)
   #:export (guix-system
+            read-operating-system
 
             service-node-type
             shepherd-service-node-type))
@@ -107,6 +108,11 @@
                       (gnu services)
                       (gnu system shadow))))
 
+;; Note: The procedure below is used in external projects such as Emacs-Guix.
+(define (read-operating-system file)
+  "Read the operating-system declaration from FILE and return it."
+  (load* file %user-module))
+
 
 ;;;
 ;;; Installation.