$PKSCRIPT throughout this text refers to the scripting language we will use
for building replacement infrastructure for /usr/ports.

pi refers to portinstall, the port engine command line interface.

2.3.4 is a hypotetical version number for the scripting language
1.2.3 is a hypotetical version number for the port engine.

Assume $PKGSCRIPT bootstrap is located in /usr/ports/Bootstrap

Example is made based on writing to /usr/ports/Bootstrap; replace with writing
to appropriate location during implementation.

1. Download $PKGSCRIPT tarball into /usr/ports/distfiles/
2. Check checksum of $PKGSCRIPT
3. Create directory /usr/ports/Bootstrap/work
4. Extract source of $PKGSCRIPT into /usr/ports/Bootstrap/work/$PKGSRC-2.3.4
5. Do any necessary patches
6. Create /usr/ports/Bootstrap/work/$PKGSCRIPT-tempinstall
7. Configure $PKGSCRIPT for install into
	/usr/ports/Bootstrap/work/$PKGSCRIPT-tempinstall
8. Build $PKGSCRIPT
9. Install $PKGSCRIPT into /usr/ports/Bootstrap/work/$PKGSCRIPT-tempinstall
10. Start up a $PKGSCRIPT interpreter that load up the port infrastructure
    modules, and any dependent modules, and then core dump (intentionally).
    Call the core dump pi-initial-2.3.4.core
11. Run "undump" on pi-initial-2.3.4.core, generating pi-initial-1.2.3
12. Run regression tests on pi-initial-2.3.4
13. Install pi-initial-2.3.4 as $PREFIX/bin/pi-initial-1.2.3, with a symlink
    from $PREFIX/bin/pi.
    Use pi to register this installation as an installation of pi.
14. Remove /usr/ports/Bootstrap/work

We now have infrastructure in place!

I recommend that we do not normally delete all old versions of pi as a part of
upgrading it; too risky.