[bug#64119] [PATCH] services: shepherd: Sanitize 'provision' field.

[Bruno Victal]

Fixes <https://issues.guix.gnu.org/63979>.

* gnu/services/shepherd.scm (<shepherd-service>)[provision]: Set field
sanitizer.
(sanitize-shepherd-service-provision): New procedure.
---
 gnu/services/shepherd.scm | 13 ++++++++++++-
 1 file changed, 12 insertions(+), 1 deletion(-)

diff --git a/gnu/services/shepherd.scm b/gnu/services/shepherd.scm
index de40454f7d..1333067817 100644
--- a/gnu/services/shepherd.scm
+++ b/gnu/services/shepherd.scm
@@ -4,6 +4,7 @@
 ;;; Copyright © 2018 Carlo Zancanaro <carlo@zancanaro.id.au>
 ;;; Copyright © 2020 Jan (janneke) Nieuwenhuizen <janneke@gnu.org>
 ;;; Copyright © 2021 Maxime Devos <maximedevos@telenet.be>
+;;; Copyright © 2023 Bruno Victal <mirai@makinata.eu>
 ;;;
 ;;; This file is part of GNU Guix.
 ;;;
@@ -21,6 +22,7 @@
 ;;; along with GNU Guix.  If not, see <http://www.gnu.org/licenses/>.
 
 (define-module (gnu services shepherd)
+  #:use-module (guix diagnostics)
   #:use-module (guix ui)
   #:use-module (guix sets)
   #:use-module (guix gexp)
@@ -186,12 +188,21 @@ (define %default-modules
     ((guix build utils) #:hide (delete))
     (guix build syscalls)))
 
+(define (sanitize-shepherd-service-provision expr)
+  (match expr
+    (((? symbol?) ..1) expr)
+    (_
+     (raise
+      (formatted-message
+       (G_ "'provision' must be a non-empty list of symbols"))))))
+
 (define-record-type* <shepherd-service>
   shepherd-service make-shepherd-service
   shepherd-service?
   (documentation shepherd-service-documentation        ;string
                  (default "[No documentation.]"))
-  (provision     shepherd-service-provision)           ;list of symbols
+  (provision     shepherd-service-provision            ;list of symbols
+                 (sanitize sanitize-shepherd-service-provision))
   (requirement   shepherd-service-requirement          ;list of symbols
                  (default '()))
   (one-shot?     shepherd-service-one-shot?            ;Boolean

base-commit: 31336e9f5d68512a9c1c6826bce9f17c892a2125
-- 
2.39.2