Collection of useful information about git

ToDo for everyone (working on analysis code)

1. create an account on GitHub https://github.com
2. map your GitHub account with your CERN account https://cmsgit.web.cern.ch/cmsgit/cmsgit
3. tell your analysis group about your account
4. read the FAQs (see below)

Central FAQ

• CMSSW http://cms-sw.github.io/cmssw/faq.html
• UserCode http://cms-sw.github.io/cmssw/usercode-faq

References

Quick Overview

• http://ndpsoftware.com/git-cheatsheet.html a very nice interactive overview of the most important (and also quite advanced) commands
• http://byte.kde.org/~zrusin/git/git-cheat-sheet-medium.png a good print-out cheatsheet

Presentations

• https://indico.cern.ch/conferenceDisplay.py?confId=257196 ETH technical git meeting

Books/Documentation

• http://git-scm.com/documentation very extensive reference with many examples
• http://marklodato.github.io/visual-git-guide/index-en.html for people who like looking at pictures

Issues

Cloning the CMSSW git repository to T3 is very slow

This is because cloning does a lot of very small IO operations (almost worst case for the NFS); try to clone onto /scratch and then copy the entire directory to your home.

Technical Points

What is the space limit for repositories on GitHub?

Roughly 1 GB; see https://help.github.com/articles/what-is-my-disk-quota. If you have that much code it's maybe advantageous to split up into multiple repositories.

Do we need a central place to have a backuped copy of the our analysis code repositories?

-- DanielMeister - 2013-06-11