Merge git repo into branch of another repo

Question

Given repo Foo and repo Bar. I want to merge Bar with Foo, but only into a separate branch, called baz.

git switch -c baz <= put the Bar repo here.

Answer 1

You can't merge a repository into a branch. You can merge a branch from another repository into a branch in your local repository. Assuming that you have two repositories, foo and bar both located in your current directory:

$ ls
foo bar

Change into the foo repository:

$ cd foo

Add the bar repository as a remote and fetch it:

$ git remote add bar ../bar
$ git remote update

Create a new branch baz in the foo repository based on whatever your current branch is:

$ git switch -c baz

Merge branch somebranch from the bar repository into the current branch:

$ git merge --allow-unrelated-histories bar/somebranch

(--allow-unrelated-histories is not required prior to git version 2.9)