From d2fc76462e72268ee5b04fe53805efc05c35e139 Mon Sep 17 00:00:00 2001
From: "Jan (janneke) Nieuwenhuizen" <janneke@gnu.org>
Date: Sat, 25 Apr 2020 15:20:04 +0200
Subject: services: shepherd: Cross-compilation fix.

Fixes <https://bugs.gnu.org/40839>.
Reported by Jan (janneke) Nieuwenhuizen <janneke@gnu.org>
Fix suggested by Mathieu Othacehe <m.othacehe@gmail.com>

However, <https://bugs.gnu.org/29296> still applies; %current-target-system
may not be bound.

* gnu/services/shepherd.scm (scm->go): Use `with-target' when cross-compiling.
---
 gnu/services/shepherd.scm | 39 +++++++++++++++++++++++----------------
 1 file changed, 23 insertions(+), 16 deletions(-)

diff --git a/gnu/services/shepherd.scm b/gnu/services/shepherd.scm
index 2f30c6c907..655a45a936 100644
--- a/gnu/services/shepherd.scm
+++ b/gnu/services/shepherd.scm
@@ -2,6 +2,7 @@
 ;;; Copyright © 2013, 2014, 2015, 2016, 2018, 2019, 2020 Ludovic Courtès <ludo@gnu.org>
 ;;; Copyright © 2017 Clément Lassieur <clement@lassieur.org>
 ;;; Copyright © 2018 Carlo Zancanaro <carlo@zancanaro.id.au>
+;;; Copyright © 2020 Jan (janneke) Nieuwenhuizen <janneke@gnu.org>
 ;;;
 ;;; This file is part of GNU Guix.
 ;;;
@@ -25,6 +26,7 @@
   #:use-module (guix store)
   #:use-module (guix records)
   #:use-module (guix derivations)                 ;imported-modules, etc.
+  #:use-module (guix utils)
   #:use-module (gnu services)
   #:use-module (gnu services herd)
   #:use-module (gnu packages admin)
@@ -260,22 +262,27 @@ stored."
 (define (scm->go file)
   "Compile FILE, which contains code to be loaded by shepherd's config file,
 and return the resulting '.go' file."
-  (with-extensions (list shepherd)
-    (computed-file (string-append (basename (scheme-file-name file) ".scm")
-                                  ".go")
-                   #~(begin
-                       (use-modules (system base compile))
-
-                       ;; Do the same as the Shepherd's 'load-in-user-module'.
-                       (let ((env (make-fresh-user-module)))
-                         (module-use! env (resolve-interface '(oop goops)))
-                         (module-use! env (resolve-interface '(shepherd service)))
-                         (compile-file #$file #:output-file #$output
-                                       #:env env)))
-
-                   ;; It's faster to build locally than to download.
-                   #:options '(#:local-build? #t
-                               #:substitutable? #f))))
+  ;; FIXME: %current-target-system may not be bound <https://bugs.gnu.org/29296>
+  (let ((target (%current-target-system)))
+    (with-extensions (list shepherd)
+      (computed-file (string-append (basename (scheme-file-name file) ".scm")
+                                    ".go")
+                     #~(begin
+                         (use-modules (system base compile)
+                                      (system base target))
+
+                         ;; Do the same as the Shepherd's 'load-in-user-module'.
+                         (let ((env (make-fresh-user-module)))
+                           (module-use! env (resolve-interface '(oop goops)))
+                           (module-use! env (resolve-interface '(shepherd service)))
+                           (with-target #$(or target #~%host-type)
+                             (lambda _
+                               (compile-file #$file #:output-file #$output
+                                             #:env env)))))
+
+                     ;; It's faster to build locally than to download.
+                     #:options '(#:local-build? #t
+                                 #:substitutable? #f)))))
 
 (define (shepherd-configuration-file services)
   "Return the shepherd configuration file for SERVICES."
-- 
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