如何将多个存储库克隆到现有存储库中？

Question

Assuming there are three repos containing the files below:

1. git@github.com:me/project.git

    code/file1 code/file2 code/file3

2. git@github.com:me/extras1.git

    code/file4 code/file5 code/file6

3. git@github.com:me/extras2.git

    code/file7 code/file8 code/file9

So far I have cloned project.git , so I have the following directory structure:

project/code/file1
project/code/file2
project/code/file3

How would you clone (or merge?) extras1.git and extras2.git so that you end up with the directory structure below AND still be able to do a git pull for each repo:

project/code/file1
project/code/file2
project/code/file3
project/code/file4
project/code/file5
project/code/file6
project/code/file7
project/code/file8
project/code/file9

Answer 1

I believe the following will do it (assuming each repo has a single branch called "master")

git remote add extras1 git@github.com:me/extras1.git
git fetch extras1
git merge --allow-unrelated-histories extras1/master
git remote add extras2 git@github.com:me/extras2.git
git fetch extras2
git merge --allow-unrelated-histories extras2/master