migrate several github repos to one repo and still preserve the commit history

Question

I have wrote some projects for crawl merchandise data from some e-commerce website. I organized
them into several github repos, which means the project that crawl the walmart stored in a github repo named walmart. So i have several repos like walmart, bestbuy now. I want to migrate these repos into another one repo and still preserve the commit history. After google, i can't find a useful method to try. Is there a method to do that?

Answer 1

Assuming you want a repo which looks like

/rootOfTheRepo
  .git
  /walmart
  /bestbuy

what you could do is:

• Prepare the subrepos by moving the files where they should be in the final repo
• Go in one of the repo and fetch the commit from the other
• Merge the two master branch

In bash it would look like, from you local clones:

cd /path/to/walmartRepo
mkdir walmart
git mv file1 file2 dir1 dir2 walmart
git commit -am "Moved files"

cd /path/to/bestbuyRepo
mkdir bestbuy
git mv file1 file2 dir1 dir2 bestbuy
git commit -am "Moved files"

git remote add walmart /path/to/walmartRepo
git fetch --all
git merge walmart/master

Once you do this, your besbuy repo has been turned into a new global repo. You just need to create a corresponding repo on github, and push this new commit there.