Add support for dumpon/savecore to run on full installs.

etc/rc

@@ -110,6 +110,7 @@ elif [ "$PLATFORM" = "nanobsd" ] ; then
 	/bin/rm -rf /var/db/pkg
 	/bin/ln -s /root/var/db/pkg/ /var/db/pkg
 else
+	/etc/rc.dumpon
 	SWAPDEVICE=`/bin/cat /etc/fstab | /usr/bin/grep swap | /usr/bin/cut -f1`
 	/sbin/swapon -a 2>/dev/null >/dev/null
 fi

etc/rc.dumpon

@@ -0,0 +1,48 @@
+#!/bin/sh
+# Based on:
+# FreeBSD: src/etc/rc.d/dumpon,v 1.12.2.1.4.1 2010/06/14 02:09:06 kensmith Exp
+# FreeBSD: src/etc/rc.d/savecore,v 1.16.2.2.4.1 2010/06/14 02:09:06 kensmith Exp
+
+dumpon_try()
+{
+	if /sbin/dumpon "${1}" ; then
+		# Make a symlink in devfs for savecore
+		echo "Using ${1} for dump device."
+		ln -fs "${1}" /dev/dumpdev
+		return 0
+	fi
+	echo "Unable to specify $1 as a dump device."
+	return 1
+}
+
+# Enable dumpdev so that savecore can see it. Enable it
+# early so a crash early in the boot process can be caught.
+#
+while read dev mp type more ; do
+	[ "${type}" = "swap" ] || continue
+	[ -c "${dev}" ] || continue
+	dumpon_try "${dev}" && works=true
+done </etc/fstab
+if [ "${works}" != "true" ]; then
+	echo "No suitable dump device was found." 1>&2
+	exit
+fi
+
+dumpdev=`/bin/realpath /dev/dumpdev`
+dumpdir='/var/crash'
+
+if [ ! -c "${dumpdev}" ]; then
+	echo "Dump device does not exist.  Savecore not run."
+	exit
+fi
+
+if [ ! -d "${dumpdir}" ]; then
+	echo "Dump directory does not exist.  Savecore not run."
+	exit
+fi
+
+if savecore -C "${dumpdir}" "${dumpdev}" >/dev/null; then
+	savecore ${dumpdir} ${dumpdev}
+else
+	echo 'No core dumps found.'
+fi