Build a FreeBSD jail skeleton

build.sh

#
# Build jail template script
# Feb 1, 2019 Roy Chan
#

dir="$(pwd)"

# First, delete current
chflags -R noschg $dir/base $dir/skel
rm -R $dir/base $dir/skel

# Create base and skel
mkdir $dir/base $dir/skel

# Install base system
bsdinstall jail $dir/base

# Update ports tree
mkdir $dir/base/usr/ports
portsnap -p $dir/base/usr/ports fetch  

# Create a skeleton
mkdir $dir/skel/home $dir/skel/distfiles
mv $dir/base/etc $dir/skel/
mv $dir/base/usr/local/ $dir/skel/usr-local
mv $dir/base/tmp/ $dir/skel/
mv $dir/base/var/ $dir/skel/
mv $dir/base/root/ $dir/skel/

# Skip: mergemaster
# https://www.freebsd.org/doc/handbook/jails-application.html

# Create symlinks
cd $dir/base
mkdir skel
ln -s skel/etc etc
ln -s skel/home home
ln -s skel/root root
ln -s ../skel/usr-local usr/local
ln -s ../../skel/distfiles usr/ports/distfiles
ln -s skel/tmp tmp
ln -s skel/var var
cd $dir

# Change port build dir
echo "WRKDIRPREFIX?=  /skel/portbuild" | tee $dir/skel/etc/make.conf