Add a mix task to download the docker image.

Author: pgr0ss

README.md

@@ -21,8 +21,9 @@ On OS X, `brew install postgresql`
 To start your new Phoenix application:
 
 1. Install dependencies with `mix deps.get`
-2. Create and migration the database with `mix db.reset`
-3. Start Phoenix with `mix phoenix.server`
+2. Download docker image with `mix docker.pull`
+3. Create and migrate the database with `mix db.reset`
+4. Start Phoenix with `mix phoenix.server`
 
 Now you can visit `localhost:4000` from your browser.
 

lib/mix/tasks/docker.ex

@@ -0,0 +1,12 @@
+defmodule Mix.Tasks.Docker do
+  defmodule Pull do
+    use Mix.Task
+
+    @shortdoc "Pulls the docker image"
+    @moduledoc "Pulls the docker image"
+
+    def run(_args) do
+      ElixirExperience.Docker.pull_image
+    end
+  end
+end

web/models/docker.ex

@@ -1,7 +1,7 @@
 defmodule ElixirExperience.Docker do
   require Logger
 
-  @image_name "trenpixster/elixir"
+  @image_name "trenpixster/elixir:1.0.4"
   @test_template "code_templates/test.txt.eex"
   @test_name "ElixirExperienceTest"
 
@@ -16,7 +16,9 @@ defmodule ElixirExperience.Docker do
 
   defp image_exists? do
     {output, 0} = System.cmd("docker", ["images"], stderr_to_stdout: true)
-    String.contains?(output, @image_name)
+    output
+    |> String.replace(~r" +", ":")
+    |> String.contains?(@image_name)
   end
 
   def run(code, timeout \\ 5000) do