rc: start to simplify cdrom handling; zap varmfs/etcmfs

etcmfs has been known to break when /etc gets too big, so
just remove it with a general /tmp partition that is set via
the tools.git through rc.conf and slap unionfs mounts on top.

src/etc/rc

@@ -24,12 +24,6 @@ PLATFORM=`/bin/cat /usr/local/etc/platform`
 # Set our current version
 version=`/bin/cat /usr/local/etc/version`
 
-# Setup dumpdev/ddb/savecore"
-echo "Configuring crash dumps..."
-if [ "$PLATFORM" = "pfSense" ]; then
-	/usr/local/etc/rc.dumpon
-fi
-
 if [ -e /root/force_fsck ]; then
 	echo "Forcing filesystem check..."
 	/sbin/fsck -y -t ufs /
@@ -66,7 +60,16 @@ if [ "$PLATFORM" = "pfSense" ]; then
 fi
 
 if [ "${PLATFORM}" = "cdrom" ]; then
-	/usr/local/etc/rc.cdrom
+	/etc/rc.d/tmp start
+
+	# fake a writeable environment in some subdirs
+	for i in cf etc home root usr var; do
+		/bin/mkdir -p /tmp/.cdrom/${i}
+		/sbin/mount_unionfs /tmp/.cdrom/${i} /${i}
+	done
+
+	# special handling for link
+	/sbin/mount_nullfs /cf/conf /conf
 else
 	# Mount /. If it fails run a fsck.
 	if [ "$PLATFORM" = "nanobsd" ]; then
@@ -132,6 +135,21 @@ else
 	fi
 fi
 
+# set keyboard map if needed
+/etc/rc.d/syscons onestart
+
+# probe for a persistent core dump device
+/usr/local/etc/rc.dumpon
+
+# Bootstrap config.xml if necessary
+if [ ! -f /conf/config.xml ]; then
+	echo -n "Bootstrapping config.xml..."
+	/bin/mkdir -p /conf/backup
+	/bin/mkdir -p /conf/sshd
+	/bin/cp /usr/local/etc/config.xml /conf/config.xml
+	echo " done."
+fi
+
 /bin/rm -f /root/force_fsck
 /bin/rm -f /root/TRIM_set
 /bin/rm -f /root/TRIM_unset
@@ -210,22 +228,6 @@ if ls /usr/local/share/pbi-keys/*.ssl >/dev/null 2>&1; then
 	cp -f /usr/local/share/pbi-keys/*.ssl /var/db/pbi/keys
 fi
 
-if [ "$PLATFORM" = "cdrom" ] ; then
-	echo -n "Mounting unionfs directories..."
-	/bin/mkdir /tmp/unionfs
-	/bin/mkdir /tmp/unionfs/usr
-	/bin/mkdir /tmp/unionfs/root
-	/bin/mkdir /tmp/unionfs/sbin
-	/bin/mkdir /tmp/unionfs/bin
-	/bin/mkdir /tmp/unionfs/boot
-	/sbin/mount_unionfs /tmp/unionfs/usr /usr/
-	/sbin/mount_unionfs /tmp/unionfs/root /root/
-	/sbin/mount_unionfs /tmp/unionfs/bin /bin/		
-	/sbin/mount_unionfs /tmp/unionfs/sbin /sbin/	
-	/sbin/mount_unionfs /tmp/unionfs/boot /boot/
-	echo "done."
-fi
-
 # make some directories in /var
 /bin/mkdir -p $varrunpath /var/log /var/etc /var/db/entropy /var/at/jobs/ /var/empty 2>/dev/null
 /bin/rm -rf $varrunpath/*

src/etc/rc.cdrom

-#!/bin/sh
-#
-# rc.cdrom - livedisc specific routines
-# For pfSense
-
-# Size of memory file system /conf /home partitions
-partsize="6m"
-
-export VARMFS_COPYDBPKG=yes
-
-for i in tmp varmfs etcmfs; do
-       if [ -f /etc/rc.d/$i ]; then
-			sh /etc/rc.d/$i start
-       fi
-done
-
-# Add /conf and populate with stock configuration.
-if [ ! -f /conf/config.xml ]; then
-       echo -n "Generating a MFS /conf partition... "
-       device=$(mdconfig -a -t malloc -s ${partsize})
-       newfs /dev/${device} > /dev/null 2>&1
-       mount /dev/${device} /conf
-       cp /usr/local/etc/config.xml /conf
-       mount_nullfs /conf /cf/conf
-       echo "done."
-fi
-
-echo -n "Generating a MFS /home partition... "
-device=$(mdconfig -a -t malloc -s ${partsize})
-newfs /dev/${device} > /dev/null 2>&1
-mount /dev/${device} /home
-echo "done."
-
-# Create some needed directories
-/bin/mkdir -p /var/db/pkg/
-/bin/mkdir -p /var/tmp/vi.recover/