How to combine two separate unrelated Git repositories into one with single history timeline

I think you do it like this:

git remote add [repo b]
git fetch//get the repo b into repo a
due to you want to keep the history like this: A0-A1-B1-B0-D1-C0-D0-E0-F0-G0-E1-H(from repo B)-HEAD (new repo A) you can first select the A0 as a start point, after that, use git cherry-pick one by one.

Hope this is useful for you.

Br, Tim

I did something similar (merge history from B into A) like this:

go to your repo A
git fetch <ref to your repo B> master:new-branch-on-A (so, you have copied master branch of B into a new branch 'new-branch-on-A' into your repo A.
git checkout new-branch-on-A
git rebase master (you rebase the new-branch-on-A with the master branch)
resolve conflicts if there are any
git checkout master
git merge new-branch-on-A
git branch -d new-branch-on-A
Done :), your histories are merged. I think all commits from A are before commit from B in the new history (git rebase -i is your friend if needed).

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