Find when a GitHub project forked from it's GitHub fork parent

Question

I want to know what commit a specific project was forked from its parent so I can fork from the same commit number.

How can I achieve this?

More specifically, I want to know the commit number of when

https://github.com/superbitcoin/SuperBitcoin

was forked from

https://github.com/bitcoin/bitcoin

Answer 1

First clone one of the repositories:

git clone https://github.com/superbitcoin/SuperBitcoin.git

The superbitcoin/SuperBitcoin repository is your origin . Now add the other repository as a second remote and fetch its commits:

cd SuperBitcoin
git remote add upstream https://github.com/bitcoin/bitcoin.git
git fetch upstream

Now you can use merge-base , as suggested by max630 in the comments:

git merge-base origin/master upstream/master

Note that you must compare specific branches.

This gives c2704ec98a1b7b35b6a7c1b6b26a3f16d44e8880 , which is the last common commit between the two branches. You can see this commit in each repository .