docker build/run doesnt work yet

$ docker build --tag="dat-docker-example" .
Sending build context to Docker daemon 52.22 kB
Sending build context to Docker daemon 
Step 0 : from chilijung/docker-r
 ---> 6752078c59b8
Step 1 : workdir /root
 ---> Running in 1484c3ed26fd
 ---> 8b2326a7ae94
Removing intermediate container 1484c3ed26fd
Step 2 : onbuild add . /root/
 ---> Running in 3ad35336d963
 ---> ce27f14a7778
Removing intermediate container 3ad35336d963
Step 3 : entrypoint ["./transform.r"]
 ---> Running in d3a89a2a7b70
 ---> 1d8f32084337
Removing intermediate container d3a89a2a7b70
Successfully built 1d8f32084337
$ docker run dat-docker-example
exec: "./transform.r": stat ./transform.r: no such file or directory2014/08/31 20:57:19 Error response from daemon: Cannot start container 14b12a721e37d387bebb850013a0a5c7f6c2869c14152e44edeea780e9045b46: exec: "./transform.r": stat ./transform.r: no such file or directory

cc @mafintosh

this was all executed from inside the dat-docker-example directory

Start by inspecting the Docker build instructions shown in the report, especially the ONBUILD ADD and ENTRYPOINT steps, and check whether transform.r is present at the expected path inside the image. Reproduce the commands from the docker-r-transform directory; done means docker build completes and docker run starts without the missing-file error.