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Git: creating a new repo from existing repo's subfolder and keeping them in sync

I currently have the following repository structure

Repository A
  - Folder 1
  - Folder 2

I need to take out the Folder 1 and create another repository like the following

Repository B
 - Folder 1

But there will be active development on both A and B's folder 1 for the time being until such a time where we do a cutoff. So the need is to be able to keep them in sync such that whenever a PR is merged into the develop branch of Repository A, the same changes can be merged to Repository B if they belong to Folder 1.

My git knowledge is limited so my first question is this a feasible task and if so how to go about setting up Repository B and the corresponding merge mechanism. I have seen an example of splitting a subdirectory into a repo here - https://docs.github.com/en/github/using-git/splitting-a-subfolder-out-into-a-new-repository

But how do I keep them both in sync once they are created. Thanks for all your help.

Solution

  • An easy way to handle this is to continue to work in the current repo with Folder 1 & 2. When you are ready, simply delete Folder 2 from the main repo.

    Otherwise:

    Step 1: Create new repo from another repo's subfolder

    • The link you provided appears to have enough info to assist you in creating your new repo.

    Step 2: Keep new repo in sync with old repo.

    • It appears that the syncing of two repos can be accomplished with GitHub Actions.

    • If you have GitHub actions available to you, check out the github-sync repository which demos how to sync branches between repos.

    • It's unclear if GitHub actions will be able to differentiate changes to Folder 1 specifically. You may need to keep Folder 2 in the second/new repo until you are done with it.