[Buildroot] [PATCH v4 5/5] package/initscripts: add service to load kernel modules at boot

[Angelo Compagnucci]

In cases where no hotplug is available (by choice or by the lack of a
proper hotplug method for a device), this service can be used to load
kernel module drivers by reading the /etc/modules-load.d/*.conf files.
The modules files matches the one used by systemd, which in turn has
a builtin mechanism to load a module at boot, therefore making systemv
init on par with systemd features.

Signed-off-by: Angelo Compagnucci <angelo at amarulasolutions.com>
---
v2:
* Moved script to initscripts (Arnout)
* Moved script to S11modules, after S10[mu]dev (Andreas)
* Use /etc/modules-load.d/ to share the same setup with systemd (me)
v4:
* Select only .conf file (Peter)
* Better ouput: printing module name only when loaded successfully,
  print a FAIL when at least one module fails (Peter) 

 package/initscripts/init.d/S11modules | 59 +++++++++++++++++++++++++++
 1 file changed, 59 insertions(+)
 create mode 100644 package/initscripts/init.d/S11modules

diff --git a/package/initscripts/init.d/S11modules b/package/initscripts/init.d/S11modules
new file mode 100644
index 0000000000..dcc2e79135
--- /dev/null
+++ b/package/initscripts/init.d/S11modules
@@ -0,0 +1,59 @@
+#!/bin/sh
+
+MODULES_DIR="/etc/modules-load.d/"
+
+[ -z "$(ls -A ${MODULES_DIR} 2> /dev/null)" ] && exit 0
+
+load_unload() {
+	for module_file in $(ls -1 ${MODULES_DIR}/*.conf); do
+		while read module args; do
+
+			case "$module" in
+				""|"#"*) continue ;;
+			esac
+
+			if [ "$1" = "load" ]; then
+				modprobe -q ${module} ${args} >/dev/null && \
+					printf '%s ' "$module" || RET='FAIL'
+			else
+				rmmod ${module} >/dev/null
+			fi
+
+		done < ${module_file}
+	done
+
+	RET='OK'
+}
+
+start() {
+	printf 'Starting modules: '
+
+	load_unload load
+
+	echo $RET
+}
+
+stop() {
+	printf 'Stopping modules: '
+
+	load_unload unload
+
+	echo $RET
+}
+
+restart() {
+	stop
+	sleep 1
+	start
+}
+
+case "$1" in
+	start|stop|restart)
+		"$1";;
+	reload)
+		# Restart, since there is no true "reload" feature.
+		restart;;
+	*)
+		echo "Usage: $0 {start|stop|restart|reload}"
+		exit 1
+esac
-- 
2.25.1