Add a scripting frontend. Documentation and release(7) support coming later.

Scripts take the form:

------------------------------------
PARTITIONS=ada0
DISTRIBUTIONS="kernel.txz base.txz ports.txz"

#!/bin/sh
echo "sshd_enable=YES" >> /etc/rc.conf
pkg add puppet
echo "System setup complete"
------------------------------------

The second part of the script (beginning with #!) is run in the newly
installed system after the installation onto ada0 (with default partitioning,
see scriptedpart for more complicated scenarios) is complete.

usr.sbin/bsdinstall/scripts/Makefile

@@ -2,7 +2,7 @@
 
 SCRIPTS= auto adduser checksum config docsinstall hostname jail keymap \
 	 mirrorselect mount netconfig netconfig_ipv4 netconfig_ipv6 rootpass \
-	 services time umount wlanconfig
+	 script services time umount wlanconfig
 BINDIR= /usr/libexec/bsdinstall
 
 NO_MAN=	true

usr.sbin/bsdinstall/scripts/script

@@ -0,0 +1,87 @@
+#!/bin/sh
+#-
+# Copyright (c) 2013 Nathan Whitehorn
+# All rights reserved.
+#
+# Redistribution and use in source and binary forms, with or without
+# modification, are permitted provided that the following conditions
+# are met:
+# 1. Redistributions of source code must retain the above copyright
+#    notice, this list of conditions and the following disclaimer.
+# 2. Redistributions in binary form must reproduce the above copyright
+#    notice, this list of conditions and the following disclaimer in the
+#    documentation and/or other materials provided with the distribution.
+#
+# THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
+# ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+# IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+# ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
+# FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+# DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+# OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+# HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+# LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+# OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+# SUCH DAMAGE.
+#
+# $FreeBSD$
+
+# VARIABLES:
+# PARTITIONS
+# DISTRIBUTIONS
+# BSDINSTALL_DISTDIR
+
+error() {
+	test -f $PATH_FSTAB && bsdinstall umount
+	echo "Installation Error!"
+	cat $BSDINSTALL_LOG
+	echo "Installation Error!"
+	exit 1
+}
+
+set -e
+trap error EXIT
+
+SCRIPT="$1"
+shift
+
+echo "Begun Installation at $(date)" > $BSDINSTALL_LOG
+rm -rf $BSDINSTALL_TMPETC
+mkdir $BSDINSTALL_TMPETC
+
+split -a 2 -p '^#!.*' "$SCRIPT" /tmp/bsdinstall-installscript-
+cd /tmp
+echo BORK
+
+. bsdinstall-installscript-aa
+: ${DISTRIBUTIONS="kernel.txz base.txz"}; export DISTRIBUTIONS
+export BSDINSTALL_DISTDIR
+
+# Make partitions
+rm -f $PATH_FSTAB
+touch $PATH_FSTAB
+bsdinstall scriptedpart "$PARTITIONS"
+bsdinstall mount
+
+# Unpack distributions
+bsdinstall checksum
+bsdinstall distextract
+
+# Finalize install
+bsdinstall config
+
+# Run post-install script
+if [ -f /tmp/bsdinstall-installscript-ab ]; then
+	cp /tmp/bsdinstall-installscript-ab $BSDINSTALL_CHROOT/tmp/installscript
+	chmod a+x $BSDINSTALL_CHROOT/tmp/installscript
+	mount -t devfs devfs "$BSDINSTALL_CHROOT/dev"
+	chroot $BSDINSTALL_CHROOT /tmp/installscript $@ 2>&1
+	umount "$BSDINSTALL_CHROOT/dev"
+	rm $BSDINSTALL_CHROOT/tmp/installscript
+fi
+
+bsdinstall umount
+
+echo "Installation Completed at $(date)" >> $BSDINSTALL_LOG
+
+trap true EXIT