Support hooks on git events triggered by submodules

[jclaveau]

Summary
I see two use cases for submodules with Husky

• I want my root repo to configure hooks of its submodules
• A submodule repo uses husky

Here I focus only on the first case

Context

• Terminal or GUI client (PowerShell, Git Bash, GitHub Desktop, ...)
• git / zsh

Steps

mkdir husky_submodule_hooks_from_root; cd husky_submodule_hooks_from_root; git init; pnpm init
pnpm install husky; pnpm husky
git config --get core.hooksPath
=> .husky/_

git submodule add [email protected]:typicode/husky.git husky_submodule
cd husky_submodule
git rev-parse --git-path hooks
=> .../husky_submodule_hooks_from_root/.git/modules/husky_submodule/hooks
git config --get core.hooksPath
=> nothing

• As you can see the hooks path of the submodule is outside the hooksPath of the root repo so Husky can't handle submodules hooks.

As a workaround I created the script .husky/link-submodules-hooks.sh

#!/bin/bash
# Create the symlinks .git/modules/<submodule_path>/hooks to .husky/<submodule_paths>
git submodule foreach --quiet '\
    cd $(git rev-parse --git-path hooks)/.. ;\
    mv hooks hooks.bak || true ;\
    mkdir -p ../../../../.husky/$path ;\
    ln -s ../../../../.husky/$path hooks ;\
' || true # No blocking if the .git folder is missing (like during deploy)

And run it from my package.json:

{
    "prepare": "husky; ./.husky/link-submodules-hooks.sh"
}

Glad to it, I have folders in my .husky directory where i can store my hooks like

.husky
-- submodules-path/
---- submodule1
------ pre-commit
------ pre-push
------ ...
---- submodule2
------ ...

This feature should belong, IMHO, to Husky. Meanwhile, this script may help other Husky users to achieve it!

This use case also answers your message, here #1308 (comment)

Thanks a lot for sharing your work!