Why there are more sources repos on my raspbian wheezy?
They are /etc/apt/sources.list.d/raspi.list
and /etc/apt/sources.list.d/collabora.list
.
For what are they needed?
Collabora has improved software for the foundation under contract. They implemented Hardware acceleration inside Webkit (for Ephiphany) and did work on a Wayland desktop called Maynard.
It makes sense that they run an extra repository with the improved versions.
Sources :
As the directory would suggest, those are the list of "sources" from which apt-get
will pull applications from. etc/apt/sources.list.d/raspi.list
lists the official repos, and /etc/apt/sources.list.d/collabora.list
appears to be an official mirror.
In addition to the individual files in the /etc/apt/sources.list.d/*.list
files that Jacobm001 refers to, the "master" file in /etc/apt/sources.list
is also used - it pre-dates the "individual repository file in a sub-directory" format that Debian (and thus Raspbian) now uses, and will probably have at least a reference to a mirrordirector.raspbian.org
source which actually redirects requests to a local mirror for you.