Adding /etc/modprobe.d folder for module configuration (#397)

* Add a /etc/modprobe.d folder

populated using a config USB stick with folder modprobe

* Add the documentation for the modprobe folder

Documentation/configuration.md

@@ -8,18 +8,20 @@ Format a USB stick with FAT32/EXT4/NTFS and name it `CONFIG`. Alternative you ca
 ```text
 network/
 modules/
+modprobe/
 udev/
 authorized_keys
 timesyncd.conf
 hassos-xy.raucb
 ```
 
-- The `network` folder can contain any kind of NetworkManager connection files. For more information see [Network][network.md]. 
+- The `network` folder can contain any kind of NetworkManager connection files. For more information see [Network][network.md].
 - The `modules` folder is for modules-load configuration files.
+- The `modprobe` folder is for modules configuration files (/etc/modprobe.d)
 - The `udev` folder is for udev rules files.
 - The `authorized_keys` file activates debug SSH access on port `22222`. See [Debugging Hassio][debug-hassio].
 - The `timesyncd.conf` file allow you to set different NTP servers. HassOS won't boot without correct working time servers!
-- The `hassos-*.raucb` file is a firmware OTA update which will be installed. These can be found on on the [release][hassos-release] page. 
+- The `hassos-*.raucb` file is a firmware OTA update which will be installed. These can be found on on the [release][hassos-release] page.
 
 You can put this USB stick into the device and it will be read on startup. You can also trigger this process later over the
 API/UI or by calling `systemctl restart hassos-config` on the host.
@@ -32,7 +34,7 @@ You can edit or create a `cmdline.txt` in your boot partition. That will be read
 
 ### Kernel-Module
 
-The kernel module folder `/etc/modules-load.d` is persistent and you can add your configuration files there. See [Systemd modules load][systemd-modules].
+The kernel module folder `/etc/modules-load.d` is persistent and you can add your configuration files there. See [Systemd modules load][systemd-modules]. You can add the modules configuration files in `/etc/modprobe.d` that is also persistent.
 
 ### Udev rules
 

buildroot-external/rootfs-overlay/etc/systemd/system/systemd-modules-load.service.d/hassos.conf

@@ -1,2 +1,2 @@
 [Unit]
-RequiresMountsFor=/etc/modules-load.d
+RequiresMountsFor=/etc/modules-load.d /etc/modprobe.d

buildroot-external/rootfs-overlay/usr/lib/systemd/system/etc-modprobe.d.mount

@@ -0,0 +1,14 @@
+[Unit]
+Description=Kernel persistent modprobe.d
+Requires=mnt-overlay.mount
+After=mnt-overlay.mount
+Before=systemd-modules-load.service hassos-config.service
+
+[Mount]
+What=/mnt/overlay/etc/modprobe.d
+Where=/etc/modprobe.d
+Type=None
+Options=bind
+
+[Install]
+WantedBy=hassos-bind.target

buildroot-external/rootfs-overlay/usr/sbin/hassos-config

@@ -44,12 +44,21 @@ fi
 ##
 # Modules
 if [ -d "${CONFIG_DIR}/modules" ]; then
-    echo "[Info] Update Modules configuration!"
+    echo "[Info] Update Modules autoload!"
 
     rm -rf /etc/modules-load.d/*
     cp -f ${CONFIG_DIR}/modules/* /etc/modules-load.d/
 fi
 
+##
+# Modules configuration
+if [ -d "${CONFIG_DIR}/modprobe" ]; then
+    echo "[Info] Update Modules configuration!"
+
+    rm -rf /etc/modprobe.d/*
+    cp -f ${CONFIG_DIR}/modprobe/* /etc/modprobe.d/
+fi
+
 ##
 # Udev
 if [ -d "${CONFIG_DIR}/udev" ]; then