'git status' is not read-only fs friendly

In a repository under a mounted Windows directory (ntfs) I get this error:

$ git status
fatal: unable to create '.git/index.lock': Read-only file system
$

Is this correct? there exist a workaround? I just need to know if
current working directory is clean and report back to qgit user, so
read-only access would be ok for me.

All other commands commonly used to browse a repository seems to work
well, without pretending to write stuff.

Thanks
Marco
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