Configurable log levels

Allow ssh log_level to be set - this will help to debug connection
issues.

README.md

@@ -258,6 +258,14 @@ ssh:
   proxy_command: aws ssm start-session --target %h --document-name AWS-StartSSHSession --parameters 'portNumber=%p' --region=us-east-1 ## ssh via aws ssm
 ```
 
+### Configuring the SSH log level
+
+```yaml
+ssh:
+  log_level: debug
+```
+
+Valid levels are `debug`, `info`, `warn`, `error` and `fatal` (default).
 ### Using env variables
 
 You can inject env variables into the app containers using `env`:

lib/mrsk/configuration.rb

@@ -172,7 +172,7 @@ class Mrsk::Configuration
       service_with_version: service_with_version,
       env_args: env_args,
       volume_args: volume_args,
-      ssh_options: ssh.options,
+      ssh_options: ssh.to_h,
       sshkit: sshkit.to_h,
       builder: builder.to_h,
       accessories: raw_config.accessories,

lib/mrsk/configuration/ssh.rb

@@ -1,4 +1,6 @@
 class Mrsk::Configuration::Ssh
+  LOGGER = ::Logger.new(STDERR)
+
   def initialize(config:)
     @config = config.raw_config.ssh || {}
   end
@@ -16,9 +18,21 @@ class Mrsk::Configuration::Ssh
   end
 
   def options
-    { user: user, proxy: proxy, auth_methods: [ "publickey" ], keepalive: true, keepalive_interval: 30 }.compact
+    { user: user, proxy: proxy, auth_methods: [ "publickey" ], logger: logger, keepalive: true, keepalive_interval: 30 }.compact
+  end
+
+  def to_h
+    options.except(:logger).merge(log_level: log_level)
   end
 
   private
     attr_accessor :config
+
+    def logger
+      LOGGER.tap { |logger| logger.level = log_level }
+    end
+
+    def log_level
+      config.fetch("log_level", :fatal)
+    end
 end

test/configuration/ssh_test.rb

@@ -17,16 +17,20 @@ class ConfigurationSshTest < ActiveSupport::TestCase
     assert_equal "root", @config.ssh.options[:user]
 
     config = Mrsk::Configuration.new(@deploy.tap { |c| c.merge!(ssh: { "user" => "app" }) })
-    assert_equal "app", @config.ssh.options[:user]
+    assert_equal "app", config.ssh.options[:user]
+    assert_equal 4, config.ssh.options[:logger].level
+
+    config = Mrsk::Configuration.new(@deploy.tap { |c| c.merge!(ssh: { "log_level" => "debug" }) })
+    assert_equal 0, config.ssh.options[:logger].level
   end
 
   test "ssh options with proxy host" do
     config = Mrsk::Configuration.new(@deploy.tap { |c| c.merge!(ssh: { "proxy" => "1.2.3.4" }) })
-    assert_equal "root@1.2.3.4", @config.ssh.options[:proxy].jump_proxies
+    assert_equal "root@1.2.3.4", config.ssh.options[:proxy].jump_proxies
   end
 
   test "ssh options with proxy host and user" do
     config = Mrsk::Configuration.new(@deploy.tap { |c| c.merge!(ssh: { "proxy" => "app@1.2.3.4" }) })
-    assert_equal "app@1.2.3.4", @config.ssh.options[:proxy].jump_proxies
+    assert_equal "app@1.2.3.4", config.ssh.options[:proxy].jump_proxies
   end
 end

test/configuration_test.rb

@@ -258,7 +258,7 @@ class ConfigurationTest < ActiveSupport::TestCase
         :absolute_image=>"dhh/app:missing",
         :service_with_version=>"app-missing",
         :env_args=>["-e", "REDIS_URL=\"redis://x/y\""],
-        :ssh_options=>{ :user=>"root", :auth_methods=>["publickey"], keepalive: true, keepalive_interval: 30 },
+        :ssh_options=>{ :user=>"root", :auth_methods=>["publickey"], log_level: :fatal, keepalive: true, keepalive_interval: 30 },
         :sshkit=>{},
         :volume_args=>["--volume", "/local/path:/container/path"],
         :builder=>{},

test/integration/main_test.rb

@@ -51,7 +51,7 @@ class MainTest < IntegrationTest
     assert_equal "app-#{version}", config[:service_with_version]
     assert_equal [], config[:env_args]
     assert_equal [], config[:volume_args]
-    assert_equal({ user: "root", auth_methods: [ "publickey" ], keepalive: true, keepalive_interval: 30 }, config[:ssh_options])
+    assert_equal({ user: "root", auth_methods: [ "publickey" ], keepalive: true, keepalive_interval: 30, log_level: :fatal }, config[:ssh_options])
     assert_equal({ "multiarch" => false, "args" => { "COMMIT_SHA" => version } }, config[:builder])
     assert_equal [ "--log-opt", "max-size=\"10m\"" ], config[:logging]
     assert_equal({ "path" => "/up", "port" => 3000, "max_attempts" => 7, "cmd" => "wget -qO- http://localhost > /dev/null" }, config[:healthcheck])