Go build helper script (#163)

Create a docker container and a script to call it, to help people build go plugins for use with fission.

environments/go/README.md

@@ -2,7 +2,7 @@
 
 This is the Go environment for Fission.
 
-It's a Docker image containing a Go 1.8rc3 runtime, along with a dynamic loader.
+It's a Docker image containing a Go 1.8 runtime, along with a dynamic loader.
 
 ## Build this image
 
@@ -27,3 +27,8 @@ fission env update --name go-runtime --image USER/go-runtime
 
 After this, fission functions that have the env parameter set to the
 same environment name as this command will use this environment.
+
+
+## Creating functions to use this image
+
+See the [examples README](examples/go/README.md).

environments/go/builder/Dockerfile

@@ -0,0 +1,5 @@
+FROM golang:1.8
+
+ENV GOPATH /usr
+RUN go get github.com/fission/fission
+

environments/go/builder/go-function-build

@@ -0,0 +1,11 @@
+#!/bin/sh
+
+if [ $# -eq 0 ]
+then
+    echo "No arguments, building current dir"
+    filename='.'
+else
+    filename=$1
+fi
+
+docker run --rm -v $(pwd):/build -w /build fission/go-builder go build -buildmode=plugin -o function.so $filename && echo "Compiled plugin: function.so. Use 'fission function create' to upload to fission."