[bug#68621] [PATCH v2 3/4] services: knot-resolver: Use default DNSSEC trust anchors.

[Dale Mellor]

From: Leo Nikkilä <hello@lnikki.la>

* gnu/services/dns.scm (%kresd.conf): Use default anchors.
(knot-resolver-activation): Install default anchors when missing.
---
 gnu/services/dns.scm | 17 +++++++++++++----
 1 file changed, 13 insertions(+), 4 deletions(-)

diff --git a/gnu/services/dns.scm b/gnu/services/dns.scm
index 6608046909..f83c5b6594 100644
--- a/gnu/services/dns.scm
+++ b/gnu/services/dns.scm
@@ -655,7 +655,6 @@ (define-record-type* <knot-resolver-configuration>
 
 (define %kresd.conf
   (plain-file "kresd.conf" "-- -*- mode: lua -*-
-trust_anchors.add_file('/var/cache/knot-resolver/root.keys')
 net = { '127.0.0.1', '::1' }
 user('knot-resolver', 'knot-resolver')
 modules = { 'hints > iterate', 'stats', 'predict' }
@@ -676,10 +675,20 @@ (define %knot-resolver-accounts
 (define (knot-resolver-activation config)
   #~(begin
       (use-modules (guix build utils))
-      (let ((rundir "/var/cache/knot-resolver")
-            (owner (getpwnam "knot-resolver")))
+      (let* ((rundir "/var/cache/knot-resolver")
+             (keyfile (string-append rundir "/root.keys"))
+             (owner (getpwnam "knot-resolver")))
         (mkdir-p rundir)
-        (chown rundir (passwd:uid owner) (passwd:gid owner)))))
+        (chown rundir (passwd:uid owner) (passwd:gid owner))
+
+        ;; Install initial trust anchors when missing.
+        (unless (file-exists? keyfile)
+          (copy-file #$(file-append (knot-resolver-configuration-package
+                                     config)
+                                    "/etc/knot-resolver/root.keys")
+                     keyfile)
+          (chown keyfile (passwd:uid owner) (passwd:gid owner))
+          (chmod keyfile #o755)))))
 
 (define knot-resolver-shepherd-services
   (match-lambda
-- 
2.41.0