use mdadm instead of bundled stripped down mdassemble (v2)

mdassemble can't handle newer metadata formats and fails for partitioned
arrays, among other things.

This...

- replaces the bundled mdassemble with proper support for mdadm
- fixes raid autodetection/assemble when no mdadm.conf is available
- fixes a compilation failure for newer mdadm versions

Tested w/ genkernel 3.4.10.907 and mdadm 3.1.3.

defaults/initrd.scripts

@@ -615,9 +615,10 @@ startVolumes() {
 	then
 		if [ ! -e '/etc/mdadm.conf' ]
 		then
-			/sbin/mdadm --examine > /etc/mdadm.conf
+			echo "DEVICE /dev/sd[a-z]* /dev/hd[a-z]*" >/etc/mdadm.conf
+			/sbin/mdadm --examine --scan >>/etc/mdadm.conf
 		fi
-		/sbin/mdadm --assemble
+		/sbin/mdadm -A --scan
 	fi
 
 	if [ "${USE_DMRAID_NORMAL}" = '1' ]

gen_compile.sh

@@ -457,6 +457,41 @@ compile_lvm() {
 	fi
 }
 
+compile_mdadm() {
+	if [ ! -f "${MDADM_BINCACHE}" ]
+	then
+		[ -f "${MDADM_SRCTAR}" ] ||
+			gen_die "Could not find MDADM source tarball: ${MDADM_SRCTAR}! Please place it there, or place another version, changing /etc/genkernel.conf as necessary!"
+		cd "${TEMP}"
+		rm -rf "${MDADM_DIR}" > /dev/null
+		/bin/tar -jxpf "${MDADM_SRCTAR}" ||
+			gen_die 'Could not extract MDADM source tarball!'
+		[ -d "${MDADM_DIR}" ] ||
+			gen_die 'MDADM directory ${MDADM_DIR} is invalid!'
+		
+		cd "${MDADM_DIR}"
+		sed -i "/^CFLAGS = /s:^CFLAGS = \(.*\)$:CFLAGS = -Os:" Makefile
+		sed -i "/^CXFLAGS = /s:^CXFLAGS = \(.*\)$:CXFLAGS = -Os:" Makefile
+		sed -i "/^CWFLAGS = /s:^CWFLAGS = \(.*\)$:CWFLAGS = -Wall:" Makefile
+		sed -i "s/^# LDFLAGS = -static/LDFLAGS = -static/" Makefile
+
+		print_info 1 'mdadm: >> Compiling...'
+			compile_generic 'mdadm' utils
+
+		mkdir -p "${TEMP}/mdadm/sbin"
+		install -m 0755 -s mdadm "${TEMP}/mdadm/sbin/mdadm"
+		print_info 1 '      >> Copying to bincache...'
+		cd "${TEMP}/mdadm"
+		strip "sbin/mdadm" ||
+			gen_die 'Could not strip mdadm!'
+		/bin/tar -cjf "${MDADM_BINCACHE}" sbin/mdadm ||
+			gen_die 'Could not create binary cache'
+
+		cd "${TEMP}"
+		rm -rf "${MDADM_DIR}" mdadm
+	fi
+}
+
 compile_dmraid() {
 	compile_device_mapper
 	if [ ! -f "${DMRAID_BINCACHE}" ]

gen_determineargs.sh

@@ -135,6 +135,7 @@ determine_real_args() {
 	BUSYBOX_BINCACHE=`cache_replace "${BUSYBOX_BINCACHE}"`
 	DEVICE_MAPPER_BINCACHE=`cache_replace "${DEVICE_MAPPER_BINCACHE}"`
 	LVM_BINCACHE=`cache_replace "${LVM_BINCACHE}"`
+	MDADM_BINCACHE=`cache_replace "${MDADM_BINCACHE}"`
 	DMRAID_BINCACHE=`cache_replace "${DMRAID_BINCACHE}"`
 	ISCSI_BINCACHE=`cache_replace "${ISCSI_BINCACHE}"`
 	BLKID_BINCACHE=`cache_replace "${BLKID_BINCACHE}"`
@@ -147,6 +148,7 @@ determine_real_args() {
 	BUSYBOX_BINCACHE=`arch_replace "${BUSYBOX_BINCACHE}"`
 	DEVICE_MAPPER_BINCACHE=`arch_replace "${DEVICE_MAPPER_BINCACHE}"`
 	LVM_BINCACHE=`arch_replace "${LVM_BINCACHE}"`
+	MDADM_BINCACHE=`arch_replace "${MDADM_BINCACHE}"`
 	DMRAID_BINCACHE=`arch_replace "${DMRAID_BINCACHE}"`
 	ISCSI_BINCACHE=`arch_replace "${ISCSI_BINCACHE}"`
 	BLKID_BINCACHE=`arch_replace "${BLKID_BINCACHE}"`

gen_initramfs.sh

@@ -339,10 +339,22 @@ append_mdadm(){
 	fi
 	cd ${TEMP}
 	mkdir -p "${TEMP}/initramfs-mdadm-temp/etc/"
+	mkdir -p "${TEMP}/initramfs-mdadm-temp/sbin/"
 	if [ "${MDADM}" = '1' ]
 	then
 		cp -a /etc/mdadm.conf "${TEMP}/initramfs-mdadm-temp/etc" \
 			|| gen_die "Could not copy mdadm.conf!"
+		if [ -e '/sbin/mdadm' ] && LC_ALL="C" ldd /sbin/mdadm|grep -q 'not a dynamic executable'
+		then
+			print_info 1 '		MDADM: Adding support (using local static binaries)...'
+			cp /sbin/mdadm "${TEMP}/initramfs-mdadm-temp/sbin/mdadm" ||
+				gen_die 'Could not copy over mdadm!'
+		else
+			print_info 1 '		MDADM: Adding support (compiling binaries)...'
+			compile_mdadm
+			/bin/tar -jxpf "${MDADM_BINCACHE}" -C "${TEMP}/initramfs-mdadm-temp" ||
+				gen_die "Could not extract mdadm binary cache!";
+		fi
 	fi
 	cd "${TEMP}/initramfs-mdadm-temp/"
 	find . -print | cpio ${CPIO_ARGS} --append -F "${CPIO}" \

genkernel.conf

@@ -169,6 +169,11 @@ LVM_DIR="LVM2.${LVM_VER}"
 LVM_SRCTAR="${DISTDIR}/LVM2.${LVM_VER}.tgz"
 LVM_BINCACHE="%%CACHE%%/LVM2.${LVM_VER}-%%ARCH%%.tar.bz2"
 
+MDADM_VER="VERSION_MDADM"
+MDADM_DIR="mdadm-${MDADM_VER}"
+MDADM_SRCTAR="${DISTDIR}/mdadm-${MDADM_VER}.tar.bz2"
+MDADM_BINCACHE="%%CACHE%%/mdadm-${MDADM_VER}-%%ARCH%%.tar.bz2"
+
 DMRAID_VER="VERSION_DMRAID"
 DMRAID_DIR="dmraid/${DMRAID_VER}"
 DMRAID_SRCTAR="${DISTDIR}/dmraid-${DMRAID_VER}.tar.bz2"