Issues creating an image from a git repository

[sumdog]

From the docker command line, I can run the following to build a container from a git repository:

docker build -t dyject_web git://github.com/sumdog/dyject_web.git

If I try the following:

Docker::Image.create('fromSrc' => 'git://github.com/sumdog/dyject_web.git')

I see the following:

/usr/lib64/ruby/2.2.0/uri/rfc2396_parser.rb:304:in `escape': undefined method `gsub' for nil:NilClass (NoMethodError)
	from /usr/lib64/ruby/2.2.0/uri/common.rb:99:in `escape'
	from /home/cassius/.gem/ruby/2.2.0/gems/docker-api-1.33.6/lib/docker/image.rb:129:in `get'
	from /home/cassius/.gem/ruby/2.2.0/gems/docker-api-1.33.6/lib/docker/image.rb:124:in `create'
	from /home/cassius/workspace/b2/lib/docker.rb:144:in `block in launch_containers'
	from /home/cassius/workspace/b2/lib/docker.rb:136:in `each'
	from /home/cassius/workspace/b2/lib/docker.rb:136:in `map'
	from /home/cassius/workspace/b2/lib/docker.rb:136:in `launch_containers'
	from /home/cassius/workspace/b2/lib/docker.rb:27:in `initialize'
	from ./bee2:102:in `new'
	from ./bee2:102:in `<main>'

So I started digging through the Docker API and found the Image/Build takes an argument 'remote'. So I tried the following:

          Docker::Image.build('remote' => src)

But then get the following stack trace:

  /usr/lib64/ruby/site_ruby/2.2.0/rubygems/package/tar_header.rb:131:in `initialize': :name, :size, :prefix and :mode required (ArgumentError)
from /usr/lib64/ruby/site_ruby/2.2.0/rubygems/package/tar_writer.rb:126:in `new'
from /usr/lib64/ruby/site_ruby/2.2.0/rubygems/package/tar_writer.rb:126:in `add_file'
from /home/cassius/.gem/ruby/2.2.0/gems/docker-api-1.33.6/lib/docker/util.rb:127:in `block (2 levels) in create_tar'
from /home/cassius/.gem/ruby/2.2.0/gems/docker-api-1.33.6/lib/docker/util.rb:125:in `each'
from /home/cassius/.gem/ruby/2.2.0/gems/docker-api-1.33.6/lib/docker/util.rb:125:in `block in create_tar'
from /usr/lib64/ruby/site_ruby/2.2.0/rubygems/package/tar_writer.rb:86:in `new'
from /home/cassius/.gem/ruby/2.2.0/gems/docker-api-1.33.6/lib/docker/util.rb:124:in `create_tar'
from /home/cassius/.gem/ruby/2.2.0/gems/docker-api-1.33.6/lib/docker/image.rb:249:in `build'
from /home/cassius/workspace/b2/lib/docker.rb:144:in `block in launch_containers'
from /home/cassius/workspace/b2/lib/docker.rb:136:in `each'
from /home/cassius/workspace/b2/lib/docker.rb:136:in `map'
from /home/cassius/workspace/b2/lib/docker.rb:136:in `launch_containers'
from /home/cassius/workspace/b2/lib/docker.rb:27:in `initialize'
from ./bee2:102:in `new'
from ./bee2:102:in `<main>'

So it looks like the ruby code is treating this as a build from a tar file call. What's the correct way to build a docker image from a git repository?