#!/bin/sh
#
# Create a bootable LiveCD
#
# Copyright 2003 bzerk.org
#
# This script will create a bootable cdrom image. Requirements:
# - FreeBSD 5.0 or later (we want to use devfs)
# - Around 500 MB diskspace in DESTDIR and ISODIR (together)
# - mkisofs (port or package)
#
# First we define some variables

DESTDIR=/usr/build/LiveCD
ISODIR=/usr/build/iso
SRCDIR=/usr/src
PATH=/bin:/usr/bin:/usr/local/bin

# Check the requirements

if [ "`grep 'define __FreeBSD_version' /usr/include/sys/param.h |\
     awk '{print $3}'`" -lt "500000" ]; then
	echo "FreeBSD version must be >= 5.0"
	exit
fi

export DESTDIR PATH
mkdir -p ${DESTDIR} ${ISODIR}

# Now we build and install the base system in DESTDIR

cd ${SRCDIR}
/usr/bin/make world && \
/usr/bin/make kernel
if [ $? -ne 0 ]; then
	echo "Problem building world/kernel"
	exit
fi

# Then we install all config files etc.

cd ${SRCDIR}/etc
/usr/bin/make distribution

# We now have a complete FreeBSD installation in DESTDIR. Since this
# will be booted from cdrom (read-only) we have to tweak things a 
# little or the LiveCD will not be very usable.
# Here, I have chosen to replace /var and /etc by writable (memory)
# filesystems. To accomplish this, we tweak the /etc/rc boot script
# a little:

cd ${DESTDIR}
patch <<EOF
--- /etc/rc     Sat Sep 13 05:19:12 2003
+++ etc/rc      Tue Sep 16 15:39:09 2003
@@ -50,6 +50,17 @@
 PATH=/sbin:/bin:/usr/sbin:/usr/bin
 export HOME PATH

+# Hack for mounting /var and /etc read-write (LiveCD)
+if [ -f /boot/var.tgz -a -d /var ]; then
+       /sbin/mdmfs -M -S -o async -s 16m md1 /var
+       /usr/bin/tar xpf /etc/var.tgz -C /var
+fi
+if [ -f /boot/etc.tgz -a -d /etc ]; then
+       /sbin/mdmfs -M -S -o async -s 4m md2 /etc
+       /usr/bin/tar xpf /etc/etc.tgz -C /etc
+fi
+# End hack (LiveCD)
+
 . /etc/rc.subr

 # Note: the system configuration files are loaded as part of
EOF

# Replace tmp by a symlink to var/tmp

/bin/rm -rf ${DESTDIR}/tmp && /bin/ln -s /var/tmp ${DESTDIR}tmp

# To accomplish autoconfiguration of network interfaces and some other
# stuff like a nice screensaver we create an rc.conf file like so:

cat >${DESTDIR}/etc/rc.conf <<EOF
#!/bin/sh
#
hostname="LiveCD"
inetd_enable="YES"
check_quotas="NO"
update_motd="NO"
entropy_file="NO"
entropy_dir="NO"
local_startup="/usr/local/etc/rc.d /etc/local/rc.d"
saver="daemon"
ifconfig_an0="DHCP"			
ifconfig_ar0="DHCP"			
ifconfig_awi0="DHCP"		
ifconfig_bge0="DHCP"		
ifconfig_cm0="DHCP"			
ifconfig_dc0="DHCP"			
ifconfig_de0="DHCP"			
ifconfig_ed0="DHCP"			
ifconfig_el0="DHCP"			
ifconfig_em0="DHCP"			
ifconfig_en0="DHCP"			
ifconfig_ep0="DHCP"			
ifconfig_ex0="DHCP"			
ifconfig_fe0="DHCP"			
ifconfig_fxp0="DHCP"		
ifconfig_gx0="DHCP"			
ifconfig_ie0="DHCP"			
ifconfig_lge0="DHCP"		
ifconfig_lnc0="DHCP"		
ifconfig_my0="DHCP"			
ifconfig_nge0="DHCP"		
ifconfig_oltr0="DHCP"		
ifconfig_pcn0="DHCP"		
ifconfig_ray0="DHCP"		
ifconfig_rl0="DHCP"			
ifconfig_sbni0="DHCP"		
ifconfig_sf0="DHCP"			
ifconfig_sis0="DHCP"		
ifconfig_sk0="DHCP"			
ifconfig_sn0="DHCP"			
ifconfig_sr0="DHCP"			
ifconfig_ste0="DHCP"		
ifconfig_ti0="DHCP"			
ifconfig_tl0="DHCP"			
ifconfig_tx0="DHCP"			
ifconfig_txp0="DHCP"		
ifconfig_vr0="DHCP"			
ifconfig_vx0="DHCP"			
ifconfig_wb0="DHCP"			
ifconfig_wi0="DHCP"			
ifconfig_wx0="DHCP"			
ifconfig_xe0="DHCP"			
ifconfig_xl0="DHCP"			
EOF

# For domain name resolution the file /etc/resolv.conf is needed. You
# can just copy your real /etc/resolv.conf to DESTDIR, it will be
# overwritten by dhclient each time the cd boots (thats why it needs
# to be writable)

cp /etc/resolv.conf ${DESTDIR}/etc/resolv.conf

# Assuming the live cd will be booted from the first (ide) cdrom drive,
# this is the /etc/fstab file:

cat >${DESTDIR}/etc/fstab <<EOF
/dev/acd0a      /       cd9660  ro      0       0
EOF

# OK, it's time for customization. Basically, you can put whatever
# software you like on the CD, as long as there's enough space and it
# does not want to write to files outside /etc and /var (and /tmp)
# One example: we use pkg_add to install perl

/usr/sbin/chroot ${DESTDIR} "/usr/sbin/pkg_add -r perl"

# Now we create tarfiles of the existing /var and /etc to later 
# populate the memory filesystems.

/usr/bin/tar czf ${DESTDIR}/boot/var.tgz -C ${DESTDIR}/var
/usr/bin/tar czf ${DESTDIR}/boot/etc.tgz -C ${DESTDIR}/etc

# And finally we invoke mkisofs to create a bootable image of the
# filesystem tree rooted in DESTDIR

mkisofs -V LiveCD -b boot/cdboot -no-emul-boot -P "livecd@bzerk.org" -r -o ${ISODIR}/livecd.iso ${DESTDIR}