GIT FETCH SPECIFIC COMMIT

README.md

make a new blank repository in the current directory

git init

add a remote

git remote add origin url://to/source/repository

fetch a commit (or branch or tag) of interest

Note: the full history of this commit will be retrieved

git fetch origin # SHA #

reset this repository's master branch to the commit of interest

git reset --hard FETCH_HEAD

Note that GitHub doesn't support fetching arbitrary commits by SHA: it returns this:
error: Server does not allow request for unadvertised object #SHA #

Man, you saved me, thanks

GitHub supports fetching arbitrary SHAs if e.g. a branch was force-pushed and you want to fetch the state before the forced push. Maybe this case counts as "advertised object SHA".

The commit hash must not be abbreviated.