How to use GitScm

[talg1978]

Hi all,

I'm developing a bitbucket hook and I would like to execute some free style git commands in it.
After some research I understood GitScm is the thing I was looking for:

"Provides functionality for interacting with Git repositories, exposing factories which can be used to retrieve ready-built commands for performing well-known operations as well as a builder factory which can be used to assemble custom commands.

Can anyone please share an example of how to do it?

How exactly does GitScm "exposing factories"? 

This might be a trivial Java question but GitScm is an interface (abstract) and I cannot instantiate it like the below snippet, so what is the alternative way?:

GitCommandFactory cmdFctry = new GitScm().getCommandFactory();

Any help would be highly appreciated, Tal