freebsd-dev/release/scripts/src-install.sh

#!/bin/sh
#
if [ "`id -u`" != "0" ]; then
	echo "Sorry, this must be done as root."
	exit 1
fi
if [ $# -lt 1 ]; then
	echo "You must specify which components of src to extract"
	echo "possible subcomponents are:"
	echo
	echo "base bin contrib etc games gnu include lib libexec"
	echo "release sbin share sys ubin usbin"
	echo
	echo "You may also specify all to extract all subcomponents."
	exit 1
fi

if [ "$1" = "all" ]; then
	dists="base bin contrib etc games gnu include lib libexec release sbin share sys ubin usbin"
else
	dists="$*"
fi

echo "Extracting sources into ${DESTDIR}/usr/src..."
for i in $dists; do
	echo "  Extracting source component: $i"
	cat s${i}.?? | tar --unlink -xpzf - -C ${DESTDIR}/usr/src
done
echo "Done extracting sources."
exit 0