systemd: Do not disable the journald on the IDU

The IDU is powerful enough to run the journald. This gives us
some convenienance to have additional output from our services
and we can query them at a later point in time.

This will only be useful for systems that are re-installed
from scratch.

Fixes: SYS#892

recipes-fixes/systemd/systemd_sysmocom.inc

@@ -11,7 +11,10 @@ SRC_URI += "file://journald.conf \
 SRC_URI_append_sysmobts-v1 = " file://system.conf"
 SRC_URI_append_sysmobts-v2 = " file://system.conf"
 SRC_URI_append_sysmocom-odu = " file://system.conf"
+
+# We want the journal on the ODU...
 SRC_URI_append_sysmocom-idu = " file://system.conf"
+SRC_URI_remove_sysmocom-idu = " file://0001-Feature-switch-ListenDatagram-from-run-systemd-journ.patch "
 
 # Disable depedency on dbus
 RDEPENDS_${PN}_remove = "dbus"
@@ -22,6 +25,15 @@ SYSTEMD_DISABLED_NATIVE_SERVICES = " \
   systemd-logind \
 "
 
+# disable journald as it isn't efficient
+SYSMOCOM_DISABLED_JOURNALD_SERVICES = " \
+    systemd-journald.socket \
+    systemd-journald.service \
+    systemd-journal-flush.service \
+"
+
+SYSMOCOM_DISABLED_JOURNALD_SERVICES_sysmocom-idu = ""
+
 pkg_postinst_${PN}_append () {
         cd $D${sysconfdir}/init.d
 
@@ -40,9 +52,10 @@ pkg_postinst_${PN}_append () {
         done ; echo
 
         # disable journald because its using to much cpu under stress logging
-        systemctl ${OPTS} mask systemd-journald.socket
-        systemctl ${OPTS} mask systemd-journald.service
-        systemctl ${OPTS} mask systemd-journal-flush.service
+        for i in ${SYSMOCOM_DISABLED_JOURNALD_SERVICES} ; do
+            systemctl ${OPTS} mask $i.service
+        done
+
 }
 
 do_install_append() {