There is an extension setting in VS Code that will clone submodules.

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Thank you for answering!
I didn’t even noticed there’s a Codespace configuration in VSCode Settings.

By the way, I turned on Codespaces: Enable Submodule Cloning option and tried
creating new Codespace but while the option was synced to the new Codespace properly
, submodules weren’t cloned as well.

I have a problem with this repository: note-sarisia-cc/source
.gitmodules:

[submodule "themes/zozo"]
	path = themes/zozo
	url = https://github.com/note-sarisia-cc/hugo-theme-zozo.git

Thank you for providing details!

As a workaround, I added:

"postCreateCommand": "git submodule update --init",

to devcontainer.json and it worked well.

For private repos you can do the following:

If you follow the instructions here for adding permissions for repos: https://docs.github.com/en/codespaces/managing-your-codespaces/managing-repository-access-for-your-codespaces be sure to add content: read for the specific submodule you repos

Then you can add the following to your devcontainer.json to checkout submodules and rewrite git paths:

"updateContentCommand": "git config --global url.https://x-access-token:${GITHUB_TOKEN}@github.com/.insteadOf ssh://git@github.com/ && git config --global url.https://x-access-token:${GITHUB_TOKEN}@github.com/.insteadOf git@github.com/ && git config --global url.https://x-access-token:${GITHUB_TOKEN}@github.com/.insteadOf git@github.com: && git submodule update --init --recursive",