resolved: create /etc/resolv.conf symlink at runtime

If the symlink doesn't exists, and we are being started, let's
create it to provie name resolution.

If it exists, do nothing. In particular, if it is a broken symlink,
we cannot really know if the administator configured it to point to
a location used by some service that hasn't started yet, so we
don't touch it in that case either.

https://bugzilla.redhat.com/show_bug.cgi?id=1313085

diff --git a/src/resolve/resolved.c b/src/resolve/resolved.c
index c01e53e9daf717c2a1624634dd08644eee862d41..f3d96df4589d5c8db34bad37d5e5befaeb856c28 100644 (file)
--- a/src/resolve/resolved.c
+++ b/src/resolve/resolved.c
@@ -53,6 +53,10 @@ int main(int argc, char *argv[]) {
         /* Drop privileges, but only if we have been started as root. If we are not running as root we assume all
          * privileges are already dropped. */
         if (getuid() == 0) {
+                r = symlink("../run/systemd/resolve/resolv.conf", "/etc/resolv.conf");
+                if (r < 0 && errno != EEXIST)
+                        log_warning_errno(errno,
+                                          "Could not create /etc/resolv.conf symlink: %m");
 
                 /* Drop privileges, but keep three caps. Note that we drop those too, later on (see below) */
                 r = drop_privileges(uid, gid,

diff --git a/tmpfiles.d/etc.conf.m4 b/tmpfiles.d/etc.conf.m4
index df8d42101ca51a419be8b9556daa6b9384d98011..928105ea8dc5484e9a0d9ef436c7eaa6ca8d7816 100644 (file)
--- a/tmpfiles.d/etc.conf.m4
+++ b/tmpfiles.d/etc.conf.m4
@@ -13,9 +13,6 @@ L+ /etc/mtab - - - - ../proc/self/mounts
 m4_ifdef(`HAVE_SMACK_RUN_LABEL',
 t /etc/mtab - - - - security.SMACK64=_
 )m4_dnl
-m4_ifdef(`ENABLE_RESOLVE',
-L! /etc/resolv.conf - - - - ../run/systemd/resolve/stub-resolv.conf
-)m4_dnl
 C /etc/nsswitch.conf - - - -
 m4_ifdef(`HAVE_PAM',
 C /etc/pam.d - - - -