Forbid access to /gitweb but authorize the sub projets

Hello,

I have several projects under https://myserver/gitweb and I would like to forbid the access to the root, so that the users can't list the differents projects.

However, I need to let the access to the sub projects (ex: https://myserver/gitweb/?p=project1;a=summary

How can I do please ?

Thank you in advance :)

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