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+date = "2020-03-09"
+title = "The git submodule cheat sheet"
+tags = ["git"]
+description = "git submodules are very handy, but how do you get rid of one?"
++++
+
+A git submodule, in its essence, is a reference to another git repository. It's a great
+way to include vendor code (like plugins or themes) into your own code base. This post
+contains some examples on how to use git submodules effectively. 
+
+## Add a submodule
+
+You need to know the remote git repository url and where you want to place that it in your repository. 
+
+```bash
+git submodule add https://example.com/submodule-repo.git path/to/submodule
+git add . 
+git commit -m "adds submodule path/to/submodule"
+```
+
+## Cloning a project with submodules
+
+When you clone a repository that contains submodules there are a few extra steps to be taken.
+
+```bash
+git clone http://example.com/repo.git repo
+cd repo
+git submodule init
+git submodule update
+```
+
+If you're sure you want to fetch all submodules (and their submodules), you can also use this
+fancy one-liner:
+
+```bash
+git clone --recurse-submodules http://example.com/repo.git
+```
+
+## Update your submodule
+
+If you're simply tracking the `master` branch for the submodule, you can suffice with
+a simple `fetch` and `merge`.
+
+```bash
+cd path/to/submodule
+git fetch
+git merge origin/master
+```
+
+If you're in a hurry, you can streamline this for all submodules in your repo with: 
+
+```bash
+git submodule update --remote --recursive
+```
+
+Don't forget to commit this change to your own repo, so others are locked to this new version of the
+submodule as well.
+
+## Track a specific branch of version
+
+The repo for your submodule may have a specific branch (e.g. `stable`) or tag you want to track, instead
+of `master`.
+
+```bash
+git config -f .gitmodules submodule.path/to/submodule.branch stable
+git submodule update --remote
+```
+
+Again, don't forget to commit your changes to `.gitmodules` to send this change to other contributors
+to you repository.
+
+## Remove a submodule
+
+Removing a git submodule consists of two steps: removing the reference and removing the locally cached 
+version.
+
+```bash
+git submodule deinit path/to/submodule
+git rm path/to/submodule
+git commit -m "removes submodule path/to/submodule"
+
+rm -rf .git/modules/path/to/submodule
+```
+
+## Bonus: see submodule status in `git status`
+
+You can configure git to show a submodule summary when you do a `git status`. There is a small
+performance trade-off here, but it might be useful to you.
+
+```bash
+git config status.submodulesummary 1
+```
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