Runs deps on prod by default (since we don't want to carry dev deps o…

…ver)

lib/mix/lib/mix/project.ex

@@ -69,10 +69,12 @@ defmodule Mix.Project do
   # tasks stack are properly manipulated, no side-effects
   # should remain.
   @doc false
-  def in_subproject(config, function) do
+  def in_subproject(env, config, function) do
+    old_env = Mix.env
     current = Mix.Project.current
     tasks   = Mix.Task.clear
 
+    Mix.env(env)
     Mix.Server.cast({ :post_config, config })
 
     if File.regular?("mix.exs") do
@@ -86,6 +88,7 @@ defmodule Mix.Project do
     try do
       function.()
     after
+      Mix.env(old_env)
       Mix.Project.pop
       Mix.Task.set_tasks(tasks)
     end

lib/mix/lib/mix/tasks/deps.compile.ex

@@ -63,10 +63,12 @@ defmodule Mix.Tasks.Deps.Compile do
         lockfile: File.expand_path(Mix.project[:lockfile])
       ]
 
+      child_env = opts[:env] || :prod
+
       File.cd! compile_path, fn ->
         cond do
           opts[:compile] -> do_command(opts[:compile], app)
-          mix?           -> Mix.Project.in_subproject child_config, fn -> Mix.Task.run "compile" end
+          mix?           -> Mix.Project.in_subproject child_env, child_config, fn -> Mix.Task.run "compile" end
           rebar?         -> shell.info System.cmd("rebar compile deps_dir=#{inspect root_path}")
           make?          -> shell.info System.cmd("make")
           true           -> shell.error "Could not compile #{app}, no mix.exs, rebar.config or Makefile " <>

lib/mix/test/fixtures/deps_status/custom/raw_repo/mix.exs

@@ -2,6 +2,7 @@ defmodule RawRepo.Mix do
   use Mix.Project
 
   def project do
+    Process.put(:raw_repo_env, Mix.env)
     [app: :raw_repo, version: "0.1.0"]
   end
 end

lib/mix/test/mix/tasks/deps_test.exs

@@ -153,6 +153,56 @@ defmodule Mix.Tasks.DepsTest do
     end
   end
 
+  ## Deps environment
+
+  defmodule DepsEnvApp do
+    def project do
+      [
+        app: :raw_sample,
+        version: "0.1.0",
+        deps: [
+          { :raw_repo, "0.1.0", raw: "custom/raw_repo" }
+        ]
+      ]
+    end
+  end
+
+  defmodule CustomDepsEnvApp do
+    def project do
+      [
+        app: :raw_sample,
+        version: "0.1.0",
+        deps: [
+          { :raw_repo, "0.1.0", raw: "custom/raw_repo", env: :dev }
+        ]
+      ]
+    end
+  end
+
+  test "by default sets deps env to prod" do
+    Mix.Project.push DepsEnvApp
+
+    in_fixture "deps_status", fn ->
+      Mix.Tasks.Deps.Update.run []
+      assert Process.get(:raw_repo_env) == :prod
+    end
+  after
+    purge [RawRepo, RawRepo.Mix]
+    Mix.Project.pop
+  end
+
+  test "can customize environment" do
+    Mix.Project.push CustomDepsEnvApp
+
+    in_fixture "deps_status", fn ->
+      Mix.Tasks.Deps.Update.run []
+      assert Process.get(:raw_repo_env) == :dev
+    end
+  after
+    purge [RawRepo, RawRepo.Mix]
+    Mix.Project.pop
+  end
+
   ## Nested dependencies
 
   defmodule UnmetNestedDepsApp do