mdadm: extend uci config support

Extend the mdadm package to allow to explicitely configure arrays as
well as device list entries.

Signed-off-by: Jo-Philipp Wich <jo@mein.io>

package/utils/mdadm/Makefile

@@ -9,7 +9,7 @@ include $(TOPDIR)/rules.mk
 
 PKG_NAME:=mdadm
 PKG_VERSION:=3.2.5
-PKG_RELEASE:=1
+PKG_RELEASE:=2
 
 PKG_SOURCE_URL:=@KERNEL/linux/utils/raid/mdadm
 PKG_SOURCE:=$(PKG_NAME)-$(PKG_VERSION).tar.xz

package/utils/mdadm/files/mdadm.config

@@ -1,3 +1,18 @@
 config mdadm
 	option email root
+	# list devices /dev/hd*
+	# list devices /dev/sd*
+	# list devices partitions
 
+config array
+	option uuid 52c5c44a:d2162820:f75d3464:799750f8
+	option device /dev/md0
+	# option name raid:0
+	# option super_minor 0
+	# list devices /dev/sda1
+	# list devices /dev/sdb1
+	# option spares 0
+	# option spare_group spares
+	# option bitmap /bitmap.md
+	# option container 00000000:00000000:00000000:00000000
+	# option member 1

package/utils/mdadm/files/mdadm.init

@@ -7,24 +7,84 @@ USE_PROCD=1
 PROG=/sbin/mdadm
 NAME=mdadm
 
-mdadm_email() {
+CONF="/var/etc/mdadm.conf"
+
+append_list_item() {
+	append "$2" "$1" "$3"
+}
+
+append_option() {
+	local var="$1"
+	local cfg="$2"
+	local opt="$3"
+	local name="$4"
+	local sep="$5"
+	local str
+
+	if [ -n "$sep" ]; then
+		config_list_foreach "$cfg" "$opt" append_list_item str "$sep"
+	else
+		config_get str "$cfg" "$opt"
+	fi
+
+	[ -n "$str" ] && append "$var" $(printf "%s=%s" "${name:-${opt//_/-}}" "$str")
+}
+
+mdadm_common() {
+	local cfg="$1"
+	local email devices
+
+	if [ -x /sbin/sendmail ]; then
+		append_option email "$cfg" email "MAILADDR"
+
+	fi
+
+	append_option devices "$cfg" devices DEVICE " "
+
+	printf "%s\n%s\n" "$email" "$devices" >> $CONF
+}
+
+mdadm_array() {
 	local cfg="$1"
-	if [ ! -x /sbin/sendmail ]; then
+	local uuid device devices name array
+
+	config_get uuid "$cfg" uuid
+	config_get name "$cfg" name
+	config_get device "$cfg" device
+
+	if [ -z "$device" ] || [ -z "$uuid$name" ]; then
+		echo "Skipping array without device, uuid or name" >&2
 		return
 	fi
-	config_get email "$cfg" email
+
+	[ -n "$uuid" ] && append array "uuid=$uuid"
+	[ -n "$name" ] && append array "name=$name"
+
+	append_option array "$cfg" super_minor
+	append_option array "$cfg" spares
+	append_option array "$cfg" spare_group
+	append_option array "$cfg" bitmap
+	append_option array "$cfg" container
+	append_option array "$cfg" member
+	append_option array "$cfg" devices devices ","
+
+	printf "ARRAY %s %s\n" "$device" "$array" >> $CONF
 }
 
 start_service() {
 	local email
 
+	mkdir -p "${CONF%/*}"
+	printf "# Autogenerated from /etc/config/mdadm, do not edit!\n" > $CONF
+
 	config_load mdadm
-	config_foreach mdadm_email mdadm
+	config_foreach mdadm_common mdadm
+	config_foreach mdadm_array array
 
-	$PROG --assemble --scan
+	$PROG --assemble --scan --config="$CONF"
 
 	procd_open_instance
-	procd_set_param command "$PROG" --monitor ${email:+--mail=$email} --syslog --scan
+	procd_set_param command "$PROG" --monitor --syslog --scan --config="$CONF"
 	procd_close_instance
 }