Pulling from github as a vendorized dependency in poudriere

[Derek (freebsd lists)]

Hi,

I'm attempting to port a project over, and it is dependent on a 
"vendorizing" program, which then pulls in the source of the 
dependencies to build.  (The final artifact is statically linked, 
so there shouldn't be a problem as far as installing unversioned 
libraries outside of the package/ports framework, for example.)

My port works fine in my local ports tree, and also I can build 
the project by hand without the port no problem.

When I try to use poudriere testport, and it's time to pull in 
the dependencies (as part of a build step), I get:

fatal: unable to access 'https://github.com/foo/bar': Couldn't 
connect to server

Is there something in poudriere that makes the network special? 
i.e. do build scripts not have network access in that context?

I can provide more specifics on my project:

- The vendorizing program is "gb vendor"
- I have PATCH_DEPENDS on gb, and git
- The pre-patch step runs `make deps`, a target which ultimately 
runs `gb vendor restore`, the step that gives the error message, 
and the build fails

I can provide more detail, but would like to know if I'm doing 
something horribly wrong first (i.e. trying to access the network 
with gb as a make target, versus some other way to do this).

Thanks!
Derek