In one of my projects I have a repository that contains a reference to another repository. The first one is the main page; the second is the page where the client can book a session. Because it is only a reference (a Git sub-module), after changing the sub-module I need to update the main repo to point at the new commit. How do I do that?

I use those two commands in my root repo. First downloads the latest remote commits. And the second merge latest remote master into each submodule’s current branch

git submodule foreach --recursive git fetch
git submodule foreach git merge origin master

After running them I need to add and commit changes and then push changes to remote.

git add .
git commit -m 'Update sub-module'
git push