GNU bug report logs - #42899
[PATCH 00/10] Dovecot improvements. Add support for pigeonhole.

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From: Alexey Abramov <levenson <at> mmer.org>
To: 42899 <at> debbugs.gnu.org
Subject: [bug#42899] [PATCH v4 4/8] services: dovecot: Only serialize settings with non-empty values.
Date: Tue,  8 Sep 2020 15:53:44 +0200

* gnu/services/mail.scm (serialize-space-separated-string-list): Protocols
might have custom settings, which are not supported by other protocols. To
prevent dovecot/services from crashing, serialize settings that hold non-empty
values only.
---
 gnu/services/mail.scm | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/gnu/services/mail.scm b/gnu/services/mail.scm
index a3c48bdb99..6e166af2be 100644
--- a/gnu/services/mail.scm
+++ b/gnu/services/mail.scm
@@ -99,7 +99,9 @@
                   (and (string? x) (not (string-index x #\space))))
                 val)))
 (define (serialize-space-separated-string-list field-name val)
-  (serialize-field field-name (string-join val " ")))
+  (match val
+    (() #f)
+    (_ (serialize-field field-name (string-join val " ")))))
 
 (define (comma-separated-string-list? val)
   (and (list? val)
-- 
2.28.0

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