Improve error message when track repository is not present on remote machine

[danielmitterdorfer]

Source: https://discuss.elastic.co/t/must-be-a-git-repository/143773

When --load-driver-hosts is used, the track repository must be checked out on every host. If this is not possible (no remote configured), Rally raises the error /path/to/repo must be a git repository but provides no further guidance to the user. It would be good if we could detect this specific situation and provide a more helpful error message.

[bartier]

I'd like to work on this if possible. =)

Can you provide more information about the methods/classes responsible to get the track repository and possible exception that needs to be improved?

[danielmitterdorfer]

In my opinion this one is little bit involved to implement and to be honest I am not so certain any more that we should look into this as this is a pretty special scenario.

However, we have quite a few issues flagged that would be good issues to dive into Rally development and we're happy to answer questions on the respective issues. :)

[bartier]

@danielmitterdorfer I'll try to deep into the good first issues to get used to the Rally code base. Thanks for the suggestion!