Le 2017-10-08 22:03, john herrlin a écrit :
Hey,

I am facing a problem with (openvpn-client-service) when trying to
reconfigure the system.
Its GuixSD on a x86-64, the system config is attached.

Backtrace:
In srfi/srfi-1.scm:
   592:29 19 (map1 (#<<service> type: #<service-type nscd 22f74b0…> …))
   592:29 18 (map1 (#<<service> type: #<service-type guix 22f73c0…> …))
   592:29 17 (map1 (#<<service> type: #<service-type urandom-seed…> …))
   592:29 16 (map1 (#<<service> type: #<service-type syslog 22f74…> …))
   592:29 15 (map1 (#<<service> type: #<service-type static-netwo…> …))
   592:29 14 (map1 (#<<service> type: #<service-type mingetty 22f…> …))
   592:29 13 (map1 (#<<service> type: #<service-type mingetty 22f…> …))
   592:29 12 (map1 (#<<service> type: #<service-type mingetty 22f…> …))
   592:29 11 (map1 (#<<service> type: #<service-type mingetty 22f…> …))
   592:29 10 (map1 (#<<service> type: #<service-type mingetty 22f…> …))
   592:29  9 (map1 (#<<service> type: #<service-type mingetty 22f…> …))
   592:29  8 (map1 (#<<service> type: #<service-type console-font…> …))
   592:17  7 (map1 (#<<service> type: #<service-type openvpn-clie…> …))
In gnu/services/vpn.scm:
   409:24  6 (_ #<<openvpn-client-configuration> openvpn: #<package …>)
    379:9  5 (openvpn-config-file client #<<openvpn-client-configura…>)
In ice-9/ports.scm:
    549:4  4 (call-with-output-string _)
    473:4  3 (with-output-to-port _ _)
In ice-9/boot-9.scm:
268:13 2 (for-each #<procedure 2636d40 at gnu/services/configur…> …)
In gnu/services/vpn.scm:
   112:19  1 (serialize-tls-auth client #f)
In unknown file:
           0 (string-append #f " " "1")

ERROR: In procedure string-append:
ERROR: In procedure string-append: Wrong type (expecting string): #f

Although I won't be able to check it before tomorrow evening, here is a patch that should solve your issue. Are you able to test it and tell me whether it works?

Thank you for reporting this!
From 179727553c91987a1154860f952d4d83383a48d5 Mon Sep 17 00:00:00 2001
From: Julien Lepiller <[email protected]>
Date: Mon, 9 Oct 2017 12:09:11 +0200
Subject: [PATCH] services: vpn: Fix bug with default tls-auth configuration.

* gnu/services/vpn.scm (serialize-tls-auth): Fix serialization error when
tls-auth is disabled.
---
 gnu/services/vpn.scm | 10 ++++++----
 1 file changed, 6 insertions(+), 4 deletions(-)

diff --git a/gnu/services/vpn.scm b/gnu/services/vpn.scm
index 868a227fc..cbb4a79a7 100644
--- a/gnu/services/vpn.scm
+++ b/gnu/services/vpn.scm
@@ -108,10 +108,12 @@
       #f))
 
 (define (serialize-tls-auth role location)
-  (serialize-field 'tls-auth
-                   (string-append location " " (match role
-                                                 ('server "0")
-                                                 ('client "1")))))
+  (if location
+      (serialize-field 'tls-auth
+                       (string-append location " " (match role
+                                                     ('server "0")
+                                                     ('client "1"))))
+      #f))
 (define (tls-auth? val)
   (or (eq? val #f)
       (string? val)))
-- 
2.14.2

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