Invoke git without loading user gitconfig

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http://unix.stackexchange.com – A git-interfaced tool written in Python breaks because of some settings in my local ~/.gitconfig, namely diff.noprefix=True. I know that I can use something like git -c diff.noprefix=False diff in the call but I fear other things will break in other parts of the tool or on other setups. I have been looking for a --norc or -c /dev/null parameter but didn't find my way in the documentation. (HowTos)