don't delete containers in Circle CI

Circle CI does not allow deletion of containers:

Cannot destroy container
6f30ab3de4f445d4fe47059d68d9798d40f5f66b9a1120dcfd130c0cab378cb5: Driver
btrfs failed to remove root filesystem
6f30ab3de4f445d4fe47059d68d9798d40f5f66b9a1120dcfd130c0cab378cb5: Failed
to destroy btrfs snapshot: operation not permitted

spec/simple_spec.rb

@@ -21,7 +21,7 @@ RSpec.describe "Simple" do
   end
 
   let(:proxy) { nil }
-  let(:app)   { AppRunner.new(name, proxy, env, @debug, ENV['CIRCLECI']) }
+  let(:app)   { AppRunner.new(name, proxy, env, @debug, !ENV['CIRCLECI']) }
 
   let(:name)  { "hello_world" }
   let(:env)   { Hash.new }

spec/support/app_runner.rb

@@ -14,15 +14,15 @@ class AppRunner
 
   attr_reader :proxy
 
-  def initialize(fixture, proxy = nil, env = {}, debug = false)
-    @run       = false
-    @debug     = debug
-    @tmpdir    = nil
-    @proxy     = nil
+  def initialize(fixture, proxy = nil, env = {}, debug = false, delete = true)
+    @run    = false
+    @debug  = debug
+    @tmpdir = nil
+    @proxy  = nil
+    @delete = delete
     env.merge!("STATIC_DEBUG" => "true") if @debug
 
     app_options = {
-      "name"       => "app",
       "Image"      => BuildpackBuilder::TAG,
       # Env format is [KEY1=VAL1 KEY2=VAL2]
       "Env"        => env.to_a.map {|i| i.join("=") },
@@ -32,7 +32,6 @@ class AppRunner
     }
 
     if proxy
-      app_options["Links"] = ["proxy:proxy"]
       if proxy.is_a?(String)
         @tmpdir = Dir.mktmpdir
         File.open("#{@tmpdir}/config.ru", "w") do |file|
@@ -42,7 +41,8 @@ class AppRunner
         end
       end
 
-      @proxy = ProxyRunner.new(@tmpdir)
+      @proxy = ProxyRunner.new(@tmpdir, @delete)
+      app_options["Links"] = ["#{@proxy.id}:proxy"]
       @proxy.start
 
       # need to interpolate the PROXY_IP_ADDRESS since env is a parameter to this constructor and
@@ -55,7 +55,7 @@ class AppRunner
     end
 
     @app    = Docker::Container.create(app_options)
-    @router = RouterRunner.new
+    @router = RouterRunner.new(@app.id, @delete)
   end
 
   def run(capture_io = false)
@@ -106,7 +106,7 @@ class AppRunner
       @proxy.destroy
     end
     @router.destroy
-    @app.delete(force: true)
+    @app.delete(force: true) if @delete
   ensure
     FileUtils.rm_rf(@tmpdir) if @tmpdir
   end

spec/support/container_runner.rb

@@ -2,12 +2,16 @@ require "fiber"
 require "docker"
 
 class ContainerRunner
+  extend Forwardable
+
   attr_reader :ip_address
+  def_delegators :@container, :id
 
-  def initialize(options)
+  def initialize(options, delete = true)
     @container  = Docker::Container.create(options)
     @ip_address = nil
     @thread     = nil
+    @delete     = delete
   end
 
   def start
@@ -24,6 +28,6 @@ class ContainerRunner
   end
 
   def destroy
-    @container.delete(force: true)
+    @container.delete(force: true) if @delete
   end
 end

spec/support/proxy_runner.rb

@@ -2,13 +2,12 @@ require_relative "proxy_builder"
 require_relative "container_runner"
 
 class ProxyRunner < ContainerRunner
-  def initialize(config_ru = nil)
+  def initialize(config_ru = nil, delete = true)
     options = {
-      "name" => "proxy",
       "Image" => ProxyBuilder::TAG
     }
     options["HostConfig"] = { "Binds" => ["#{config_ru}:/app/config/"] } if config_ru
 
-    super(options)
+    super(options, delete)
   end
 end

spec/support/router_runner.rb

@@ -11,12 +11,11 @@ class RouterRunner < ContainerRunner
   HTTPS_PORT = "443"
   HOST_IP    = boot2docker_ip || "127.0.0.1"
 
-  def initialize
+  def initialize(app_id, delete = true)
     super({
-      "name"       => "router",
       "Image"      => RouterBuilder::TAG,
       "HostConfig" => {
-        "Links" => ["app:app"],
+        "Links" => ["#{app_id}:app"],
         "PortBindings" => {
           "#{HTTP_PORT}/tcp" => [{
             "HostIp"   => HOST_IP,
@@ -28,6 +27,6 @@ class RouterRunner < ContainerRunner
           }]
         }
       }
-    })
+    }, delete)
   end
 end