Forbid access to /gitweb but authorize the sub projets

[Alexandre Duplaix <alexandre.duplaix-ext@sagemcom.com>]

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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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