Git from the Bottom Up (2008)
jwiegley.github.io
jwiegley.github.io
Git from the Bottom Up (2009) [pdf] - https://news.ycombinator.com/item?id=10199391 - Sept 2015 (25 comments)
Git from the Bottom-Up by John Wiegley [pdf] - https://news.ycombinator.com/item?id=2059614 - Jan 2011 (8 comments)
Git from the bottom up [pdf] - https://news.ycombinator.com/item?id=1099229 - Feb 2010 (18 comments)
Git==Blobs+Trees+Commits+nothingelse Learn Git from the bottom up - https://news.ycombinator.com/item?id=1064231 - Jan 2010 (2 comments)
Not sure how to date this, but the latest commit for the source of the book is from 2017.
https://github.com/jwiegley/git-from-the-bottom-up/commit/76...
It looks like Bitbinder [2] was the static site builder which in turn used Franklin [3] to generate the online book.
[1]: https://github.com/bitbooks/bitbooks.cc