tmpfiles: create /etc/resolv.conf symlink only on boot

We will create the symlink on boot as a fallback to provide name
resolution. But if the symlink was removed afterwards, it most likely
should not be recreated. Creating it only on boot also solves the
issue where it would be created prematurely during installation,
before the system was actually booted.

https://bugzilla.redhat.com/show_bug.cgi?id=1197204

diff --git a/tmpfiles.d/etc.conf.m4 b/tmpfiles.d/etc.conf.m4
index ab5cd16f24ae8d72455e120576b6404621cc9822..e74b02687ff59d318e37f724d6698a6b7b3c0613 100644 (file)
--- a/tmpfiles.d/etc.conf.m4
+++ b/tmpfiles.d/etc.conf.m4
@@ -11,7 +11,7 @@ L /etc/os-release - - - - ../usr/lib/os-release
 L /etc/localtime - - - - ../usr/share/zoneinfo/UTC
 L+ /etc/mtab - - - - ../proc/self/mounts
 m4_ifdef(`ENABLE_RESOLVED',
-L /etc/resolv.conf - - - - ../run/systemd/resolve/resolv.conf
+L! /etc/resolv.conf - - - - ../run/systemd/resolve/resolv.conf
 )m4_dnl
 C /etc/nsswitch.conf - - - -
 m4_ifdef(`HAVE_PAM',