--- trunk/mkinitrd-magellan/livecd/linuxrc.sh	2008/04/10 20:16:43	706
+++ trunk/mkinitrd-magellan/livecd/linuxrc.sh	2012/04/02 11:40:49	1793
@@ -1,5 +1,5 @@
 #!/bin/sh
-# $Header: /home/cvsd/magellan-cvs/magellan-src/mkinitrd-magellan/livecd/linuxrc.sh,v 1.6 2008-04-10 20:16:43 niro Exp $
+# $Id$
 
 # loads given kernel modules
 load_kernel_modules()
@@ -55,16 +55,34 @@
 ## some defaults ##
 DOSCSI=no
 DOUSB=no
-DOSATA=no
+DOSATA=yes
 DOFB=no
-DOPATA=no
+DOPATA=yes
 FORCED_ROOTFS=""
+INITEXEC="/sbin/init"
+BREAK_ENABLED=no
+UNIONFS=no
+UNIONFS_FILE=""
+CLOOPMOUNTDIR="/sysroot/mnt/cloop"
 
 ## starts here ##
 
 # mount essential filesystems
 mount -t proc proc /proc
 mount -t sysfs sysfs /sys
+if [[ -z $(grep '[[:space:]]/dev[[:space:]]' /proc/mounts | cut -d ' ' -f2) ]]
+then
+	# many video drivers needed exec access
+	fstype=ramfs
+	# tmpfs was suggested by Greg Kroah-Hartman
+	[[ $(grep '[[:space:]]tmpfs' /proc/filesystems | cut -d $'\t' -f2) = tmpfs ]] && fstype=tmpfs
+	# mount devtmpfs if supported
+	[[ $(grep '[[:space:]]devtmpfs' /proc/filesystems | cut -d $'\t' -f2) = devtmpfs ]] && fstype=devtmpfs
+	mount -t ${fstype} dev /dev -o exec,nosuid,mode=0755,size=10M
+fi
+
+# install all busybox applets
+busybox --install -s
 
 # silencio
 echo 0 > /proc/sys/kernel/printk
@@ -73,24 +91,22 @@
 for i in $(cat /proc/cmdline)
 do
 	case "${i}" in
-		doscsi)
-			DOSCSI=yes
-			;;
-		dousb)
-			DOUSB=yes
-			;;
-		dosata)
-			DOSATA=yes
-			;;
-		dofb)
-			DOFB=yes
-			;;
-		dopata)
-			DOPATA=yes
-			;;
-		rootfs=*)
-			FORCED_ROOTFS="${i#*=}"
-			;;
+		doscsi) DOSCSI=yes;;
+		noscsi) DOSCSI=no;;
+		dousb) DOUSB=yes;;
+		nousb) DOUSB=no;;
+		dosata) DOSATA=yes ;;
+		nosata) DOSATA=no ;;
+		dofb) DOFB=yes;;
+		nofb) DOFB=no;;
+		dopata) DOPATA=yes;;
+		nopata) DOPATA=no;;
+		rootfs=*) FORCED_ROOTFS="${i#*=}";;
+		init=*) INITEXEC="${i#*=}";;
+		break) BREAK_ENABLED=yes ;;
+		unionfs) UNIONFS=yes;;
+		unionfs_file=*) UNIONFS_FILE="${i#*=}";;
+		rootdelay=*) ROOTDELAY="${i#*=}";;
 	esac
 done
 
@@ -102,6 +118,11 @@
 [ "${DOUSB}" = "yes" ] && load_kernel_modules "usb"
 [ "${DOSATA}" = "yes" ] && load_kernel_modules "sata"
 
+# populate dev
+mdev -s
+# handle hotplug events properly
+echo /sbin/mdev > /proc/sys/kernel/hotplug
+
 # create newroot mount point
 mkdir -p /sysroot
 # fake a new filesystem (also needed with an initramfs!!)
@@ -118,6 +139,12 @@
 	sleep 8
 fi
 
+# respect rootdelay kernel param
+if [ ! -z "${ROOTDELAY}" ]; then
+	echo "-- Requested a rootdelay of ${ROOTDELAY} seconds ..."
+	sleep ${ROOTDELAY}
+fi
+
 # searching cdrom with cdid
 BOOT_DEVICE=""
 FSTYPE=""
@@ -165,22 +192,48 @@
 	echo -e "Mounting squashfs system image ..."
 	echo
 	[ ! -e /dev/loop0 ] && mknod /dev/loop0 b 7 0
-	mount -o loop,ro -t squashfs /sysroot/mnt/cdrom/livecdrootfs.sqsh /sysroot/mnt/cloop
+	mount -o loop,ro -t squashfs /sysroot/mnt/cdrom/livecdrootfs.sqsh "${CLOOPMOUNTDIR}"
+
+	# mount unionfs if enabled
+	if [[ ${UNIONFS} = yes ]]
+	then
+		echo -e "Mounting writeable cdbuffer (unionfs) ..."
+	
+		# default setting
+		CLOOPMOUNTDIR="/sysroot/mnt/unionfs"
+		[[ -z ${UNIONFS_FILE} ]] && UNIONFS_FILE="/sysroot/mnt/cdrom/unionfs"
+
+		[[ ! -d /sysroot/mnt/unionfs ]] && install -d /sysroot/mnt/unionfs
+		mount -t unionfs dirs=${UNIONFS_FILE}=rw:/sysroot/mnt/cloop=ro ${CLOOPMOUNTDIR}
+	fi
 
 	# symlinking cloop rootfs to /mnt as newroot
 	cd /sysroot
 
 	for x in bin sbin lib lib64 boot usr opt
 	do
-		[ -d mnt/cloop/${x} ] && ln -s mnt/cloop/${x} ${x}
+		[ -d ${CLOOPMOUNTDIR/\/sysroot\//}/${x} ] && ln -s ${CLOOPMOUNTDIR/\/sysroot\//}/${x} ${x}
 	done
 	mkdir -p initrd proc tmp sys var/tmp dev media
 
-	# make /sysroot/dev/console & /mnt/dev/null
-	[ ! -e /sysroot/dev/console ] && mknod -m 600 /sysroot/dev/console c 5 1
-	[ ! -e /sysroot/dev/null ] && mknod -m 666 /sysroot/dev/null c 1 3
+	# use devtmpfs if supported
+	if [ "$(grep devtmpfs /proc/filesystems | cut -d$'\t' -f2)" = "devtmpfs" ]
+	then
+		mount -t devtmpfs dev /sysroot/dev
+	else
+		# make /sysroot/dev/console & /mnt/dev/null
+		[ ! -e /sysroot/dev/console ] && mknod -m 600 /sysroot/dev/console c 5 1
+		[ ! -e /sysroot/dev/null ] && mknod -m 666 /sysroot/dev/null c 1 3
+		# only to be safe and to have a log channel
+		[ ! -e /sysroot/dev/tty ] && mknod /sysroot/dev/tty c 5 0
+		# busybox needs this one
+		[ ! -e /sysroot/dev/tty5 ] && mknod /sysroot/dev/tty5 c 4 5
+	fi
+
+	(cd ${CLOOPMOUNTDIR}; cp -a etc root home var /sysroot)
 
-	(cd /sysroot/mnt/cloop; cp -a etc root home var /sysroot)
+	# ensure that /sysroot/linurc exists
+	[ ! -e /sysroot/linuxrc ] && ln -snf ${INITEXEC} /sysroot/linuxrc
 
 	# ensure the right permissions
 	chmod 1777 /sysroot/tmp
@@ -189,11 +242,21 @@
 
 cd /
 
+# unset hotplug event-manager
+echo > /proc/sys/kernel/hotplug
+
 # de-silencio
 echo 3 > /proc/sys/kernel/printk
 
+if [[ ${BREAK_ENABLED} = yes ]]
+then
+	echo "-- Break requested, type 'exit' to resume operation ..."
+	ash
+fi
+
 echo "-- Switching to real sysroot ..."
-umount /sys
-umount /proc
+mount --move /dev /sysroot/dev
+mount --move /sys /sysroot/sys
+mount --move /proc /sysroot/proc
 
-exec run-init /sysroot /sbin/init $@ </sysroot/dev/console >/sysroot/dev/console
+exec run-init /sysroot ${INITEXEC} $@ </sysroot/dev/console >/sysroot/dev/console