Here is a list of what we are loosing when moving to !GitHub:

  - no private branches (where we'll put our repository for papers?)

  - no private wiki pages (where we'll put our todo list and referee comments?)

  - command line unfriendly behavior of the !GitHub download links for .zip and .tar.gz files
    - here is how it works currently:
{{{
wget http://cp3.irmp.ucl.ac.be/downloads/Delphes-3.1.2.tar.gz
}}}
    - here is how it works with !GitHub (command is almost twice longer and with additional parameters):
{{{
wget --no-check-certificate https://github.com/delphes/delphes/archive/master.tar.gz -O delphes-master.tar.gz
}}}

  - no search in wiki pages (!GitHub proposes to do it from command line using grep)

  - limited code browser:
   - no way to see file history for files moved to a new directory (Trac does it, !GitLab does it and it's now needed because all configuration files moved from examples to cards)
   - no way to compare old and new versions of the same file (and yes, I regularly use this functionality)

  - no way to adapt to our needs the interface of the code browser, wiki pages and issue tracker (for example, currently it's difficult to switch from code browser back to documentation)

  - some information (formatting, dates, users) will be lost after migration of the tickets from trac to github.

  - backup of !GitHub code repositories is more difficult (needs manual intervention for any new repository)

  - backup of issues/tickets is even more difficult

  - restore from backup is not clear at all


Possible alternatives:

  - local Trac with local Subversion repository and mirrors on !GitHub, !LaunchPad and !BitBucket as for example it's done by the Trac, and Redmine developers:
    - http://trac.edgewall.org/ticket/9235
    - ​http://github.com/edgewall/trac
    - http://github.com/redmine/redmine 

  - local Trac with local Git repository and mirrors

  - local Redmine with local Git repository and mirrors

  - local !GitLab with local Git repository and mirrors

I've just quickly checked a couple of alternatives from the above list:

  - while !GitLab is good for local projects, the initial page of the project is not customizable and the developers refuse to add this functionality: http://feedback.gitlab.com/forums/176466-general/suggestions/3907476-add-readme-to-project-home-view

  - !LaunchPad does not have wiki pages or any other way to store documentation


So far, the following solution look the most promising:

  - main Git repository goes to GitHub

  - wiki pages, tickets and mirror Git repository go to local Trac

  - trac-github (https://github.com/aaugustin/trac-github) plugin should be installed to automatically synchronize both repositories

  - Trac should be updated to version 1.0