Re: Bug: `git init` with hook `reference-transaction` running `git rev-parse --git-dir` fails

> 
> > We have another solution that is even simpler: just do nothing. I do not  
> > think that the behaviour we exhibit is wrong. Unwieldy? Maybe. But it is  
> > merely stating facts: we are executing a transaction in a repository  
> > that is not yet fully set up. If you don't want that, either don't set  
> > up a global reference-transaction hook, or alternatively handle that  
> > edge case in your script.
> 
> But then Git should at least give the hooks maintainers a chance to know what it is doing.
> Could we have a new env. variable or mechanism stating that the repository is not yet setup or so?
> The issue here comes from the fact that Githooks is a hooks manager which basically calls `reference-transaction` for you, but before
> it does it calls `git rev-parse --git-dir` to get the correct Git directory, basically not doing env. lookup on GIT_DIR which this command actually does, but that apparently only works on a "initialized" repo, so currently I do a workaround and looking directly at GIT_DIR.
> I would be really happy also if I could somehow know when Git is creating a new repository (clone, or init), that would also improve other scenarios I came across. Basically you cannot react on hook `post-checkout` only when a new repo is created...