Merging two Github repositories + history.

If you want to merge two Github repos and do not lose a commit history, let’s do it right now :)

After these steps, your repo second will be in repo first directory with all history of repo first and repo second.

Important!!! First, try it with test repositories, so if you will do mistakes that's fine. When you got it right then do it with original repos.

Let’s clone repo ‘first’ into your machine:

git clone https://github.com/Gulnoz/first
Go to the cloned repo in your terminal:
cd first
Next check remote repos within it:
git remote -v
Checking existed branches within this:
git branch -a -vv
Now we need to add second repo as remote to the first repo:
git remote add second https://github.com/Gulnoz/second
Fetching everithing from second repo:
git fetch second
We will need to create new branch for moving everithing around, lets create branch with name second:
git checkout -b second second/master
Do not make a mess with all files during merching two repos, lets create new folder and move everything from second repo to that folder:
mkdir second
git mv !(second) second
Commiting moving files into subdirectory:
git commit -m "Moved second into subdirectory"
Changing branch from second to master:
git checkout master
Finaly merging second with first repos including history:
git merge second --allow-unrelated-histories
Commit our merging repos and pushing into remote first:
git commit -m "merging"
git push
Now let's clean up :)
Removing second repo remote from first repo:
git remote rm second
Deleting branch second, we do not need it any more:
git branch -d second
Let's check our branches:
git branch -a -v

That’s it! I hope you found this helpful. Good luck!

Addition resources:

How to import existing Git repository into another?