$FreeBSD$
About sysbuild.sh
=================
I have been running -current on my laptop since before FreeBSD 2.0 was
released and along the way developed this little trick to making the
task easier.
sysbuild.sh is a way to build a new FreeBSD system on a computer from
a specification, while leaving the current installation intact.
sysbuild.sh assume you have two partitions that can hold your rootfs
and can be booted, and roughly speaking, all it does is build a new
system into the one you don't use, from the one you do use.
A partition named /freebsd is assumed to be part of your layout, and
that is where the sources and ports will be found.
If you know how nanobsd works, you will find a lot of similarity.
HOWTO
=====
In all likelihood, it is easier if we imagine you start with a blank
computer.
Grab a FreeBSD install ISO and boot it.
Create four disk slices:
ad0s1 = 5GB
ad0s2 = 5GB
ad0s3 = 5GB
ad0s4 = the rest
Create a root filesystem in s1a filling the entire ad0s1 slice.
Create a swap partition, if you want one, in ad0s4b.
Install the boot0 bootmanager.
Install the "Minimal" FreeBSD system into ad0s1a.
Reboot from the newly installed system.
Run these commands to set up the other partitions sysbuild.sh cares about:
# /freebsd filesystem
newfs -b 4096 -f 512 -O2 -U /dev/ad0s3
echo "/dev/ad0s3 /freebsd ufs rw 2 2" >> /etc/fstab
mkdir /freebsd
mount /freebsd
# deputy rootfilesystem
bsdlabel -B -w /dev/ad0s2
newfs -O2 -U /dev/ad0s2a
Next, install ports and sources:
cd /usr
rm -rf ports src
ln -s /freebsd/src
ln -s /freebsd/ports
cd /freebsd
mkdir ports src packages
svn co https://svn0.us-east.FreeBSD.org/base/stable/10 src
svn co https://svn0.us-east.FreeBSD.org/ports/head ports
And we should be ready to try a shot:
cd /root
cp /usr/src/tools/tools/sysbuild/sysbuild.sh .
sh sysbuild.sh |& tee _.sb
If it succeeds, you should be able to:
boot0cfg -s 2 -v /dev/ad0
reboot
And come up with your newly built system.
Next time you want a new system, you just run sysbuild.sh again
and boot slice 1 when it's done.
TWEAKS
======
The sysbuild.sh script takes various parameters:
-c specfile # configure stuff, see below.
-w # skip buildworld, assume it was done earlier.
-k # skip buildkernel, ---//---
-b # skip both buildworld & buildkernel
-p # install cached packacges if found.
The specfile is a shellscript where you can override or set a number of
shell variables and functions.
A partial example:
# use a kernel different from GENERIC
KERNCONF=SMP
# Cache built packages, so we can use -p
PKG_DIR=/freebsd/packages
# Mount ports distfiles from another machine
REMOTEDISTFILES=fs:/rdonly/distfiles
# Fetch distfiles through a proxy
FTP_PROXY=http://127.0.0.1:3128/
HTTP_PROXY=http://127.0.0.1:3128/
export FTP_PROXY HTTP_PROXY
# We want these ports
PORTS_WE_WANT='
/usr/ports/archivers/unzip
/usr/ports/archivers/zip
/usr/ports/cad/linux-eagle
/usr/ports/comms/lrzsz
/usr/ports/databases/rrdtool
/usr/ports/devel/subversion-freebsd
'
# Files to move over
CONFIGFILES='
/root/.ssh
/etc/X11/xorg.conf
/etc/ssh/ssh_host*
/etc/rc.conf
/etc/rc.local
'
# Shell functions to tweak things
# (This makes commits to /etc mostly painless)
final_chroot() (
chpass -p "\$1\$IgMjWs2L\$Nu12OCsjfiwHHj0I7TmUN1" root
pw useradd phk -u 488 -d /home/phk -c "Poul-Henning Kamp" \
-G "wheel,operator,dialer" -s /bin/csh -w none
chpass -p "\$1\$VcM.9Ow8\$IcXHs0h9jsk27b8N64lOm/" phk
sed -i "" -e 's/^DS/DSorigo.freebsd.dk/' /etc/mail/sendmail.cf
sed -i "" -e '/console/s/^/#/' /etc/syslog.conf
echo "beastie_disable=YES" >> /boot/loader.conf
touch /root/.hushlogin
)
