DFly full source history until the epoch of FreeBSD

[Aaron LI]

Hi all,

The current DragonFly BSD Git repository only has the code history since 
the fork in 2003, but no FreeBSD history before the fork.  To get the 
full code history, I employed the 'git-replace' method to graft the 
source history from FreeBSD before the fork to the first commit of 
DragonFly BSD.

I actually did this work last year, but today I finally created a wiki 
page to describe how to make use of the grafted history and to elaborate 
the method I used.  So here is the page:

https://www.dragonflybsd.org/docs/developer/dfly_source_full_history/

This extends the DragonFly BSD source code history by ~50k commits from 
FreeBSD until the epoch of the FreeBSD source.

It's awesome that our gitweb interface recognizes the 'replace' 
information and can show the grafted history in the 'blame' view. For
example:

https://gitweb.dragonflybsd.org/~aly/dragonfly.git/blame/HEAD:/README

However, Github doesn't have this feature in the 'blame' view.


Cheers,
Aaron