How to merge changes from one repository to another one?

merge-from-one-git-to-another.md

How to merge changes from one Git repository to another one?

For example, we need to migrate the Github (old) repository to Bitbucket (new) repository and we need to keep both of them for a while.

To do it we need to make the next steps

1. Git clone Bitbucket (new) repository

 git clone git@bitbucket.org/example.git

2. Add origin2 to Github (old) for the repository cloned from Bitbucket (new)

git remote add origin2 git@github.com/example.git

3. Push develop-new Bitbucket (new) branch to Github (old)

git push origin2 develop-new:develop-new

4. Clone Github (old) repository

git clone git@github.com/example.git

5. Identify changes in Github (old), applied later than captured date

git log develop
git log develop-new

6. Cherry-pick appropriate change-sets from develop into develop-new in GitHub

git switch develop-new
git cherry-pick ...

7. Push appropriate changes in develop-saferent in GitHub

git push

8. Fully clone and rewrite Bitbucket (new) repository by GitHub (old) repo, sample

git clone --bare git@github.com/example.git
git push --mirror git@bitbucket.org/example.git

9. Remove the directory with the bare repository.

rm -rf example.git