Git hook to update superproject on submodule change?

Question

I have three git repositories: A, B, and C. C is a superproject including submodules A and B, tracking each submodule's respective master branch.

When the master branch of A or B is changed, I must do the following in C:

git submodule update --remote
git add A
git add B
git commit -m "Update submodule A or B"
git push

At this point an automated build and deploy from C is executed.

I'm looking for ways to streamline this process. Ideally, any commit to the master branch of A or B would trigger a hook to update, commit, and push to C. Any ideas how to achieve this?

Edit: In case there's a vendor-specific feature I should be aware of, I'm using Azure DevOps for the git hosting and Azure Pipelines for the build and deploy process.

score 0 · Answer 1 · answered Feb 27 '19 at 08:54

You can use a git post-commit hook, when you do a commit in the submodules the hook will be executed and will do the commands.

Go to each sub module repo.

Create file .git/hooks/post-commit with following content:

#!/bin/sh

branch="$(git rev-parse --abbrev-ref HEAD)"

if [ "$branch" = "master" ]; then
  cd {super repo location}
  git submodule update --remote
  git add A
  git add B
  git commit -m "Update submodule A or B"
  git push
fi

Make it executable (not required on Windows):
```
$ chmod +x .git/hooks/pre-commit
```

Git hook to update superproject on submodule change?

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