How to use git lfs with hosted agents

I use git lfs to store the large files of my repo. I then try to build this repo with hosted agents. My build is pretty simple. It has a single task: Execute PowerShell. In the invoked script, the first thing that I want to do is to fetch my lfs dependencies. I therefore have the following in my script:

& git lfs fetch

Unfortunately, my build fails with the following error:

2016-03-04T19:49:05.7021988Z ##[error]git: 'lfs' is not a git command. See 'git --help'.
2016-03-04T19:49:05.7031986Z ##[error]Did you mean this?
2016-03-04T19:49:05.7041987Z ##[error]  flow

Since I can’t install anything on hosted agents, how am I supposed to have git lfs available?

Then, once it will be available, I expect to have another problem… how to use the oauth token from the SYSTEM_ACCESSTOKEN environment variable. Issue #962 talks about the oauth token problem but the solution is not clear.

[mabead]

See here and here to see how I was able to make git lfs work with VSTS hosted agents.

[pascalberger]

@mabead Your url looks wrong. Should be https://xyz.visualstudio.com/DefaultCollection/xyz/_git/GitSandbox