nfs: run a dedicated dbus daemon for nfs-ganesha

This runs a dedicated dbus daemon for nfs-ganesha in order to avoid
using the host dbus socket so we don't have to launch nfs-ganesha with
--privileged option.

Related ceph-ansible PR: ceph/ceph-ansible#4760

Closes: https://bugzilla.redhat.com/show_bug.cgi?id=1725254

Signed-off-by: Guillaume Abrioux <gabrioux@redhat.com>
(cherry picked from commit 9d78f73)

src/daemon/start_nfs.sh

@@ -8,12 +8,19 @@ function start_rpc {
 
 }
 
+function start_dbus {
+  mkdir -p /run/dbus
+  dbus-daemon --system
+}
+
 function start_nfs {
   get_config
   check_config
 
   # Init RPC
   start_rpc
+  # Start dbus daemon
+  start_dbus
 
   if [ ! -e "$RGW_KEYRING" ]; then
 
@@ -33,6 +40,7 @@ function start_nfs {
   # create ganesha log directory since the package does not create it
   mkdir -p /var/log/ganesha/
 
+
   log "SUCCESS"
   # start ganesha, logging both to STDOUT and to the configured location
   exec /usr/bin/ganesha.nfsd "${GANESHA_OPTIONS[@]}" -F -L STDOUT "${GANESHA_EPOCH}"