fix(network-manager): show output on console only with rd.debug enabled

The module should show the output on console only when initrd debugging is
enabled.

modules.d/35network-manager/nm-config.sh

@@ -16,6 +16,15 @@ if getargbool 0 rd.debug -d -y rdinitdebug -d -y rdnetdebug; then
         echo '[logging]'
         echo 'level=TRACE'
     ) > /run/NetworkManager/conf.d/initrd-logging.conf
+
+    if [ -n "$DRACUT_SYSTEMD" ]; then
+        mkdir -p /run/systemd/system/nm-initrd.service.d
+        cat << EOF > /run/systemd/system/nm-initrd.service.d/tty-output.conf
+[Service]
+StandardOutput=tty
+EOF
+        systemctl --no-block daemon-reload
+    fi
 fi
 
 nm_generate_connections

modules.d/35network-manager/nm-initrd.service

@@ -17,7 +17,9 @@ BusName=org.freedesktop.NetworkManager
 ExecReload=/usr/bin/busctl call org.freedesktop.NetworkManager /org/freedesktop/NetworkManager org.freedesktop.NetworkManager Reload u 0
 ExecStart=/usr/sbin/NetworkManager --debug
 KillMode=process
-StandardOutput=tty
+# The following gets changed to StandardOutput=tty by nm-config.sh
+# when debug is enabled.
+StandardOutput=null
 Environment=NM_CONFIG_ENABLE_TAG=initrd
 Restart=on-failure
 ProtectSystem=true