Move group_limit & group_wait under boot

Also make formatting the group strategy the responsibility of the
commander.

README.md

@@ -835,13 +835,14 @@ mrsk lock release
 
 When deploying to large numbers of hosts, you might prefer not to restart your services on every host at the same time.
 
-MRSK's default is to boot new containers on all hosts in parallel. But you can control this by configuring `group_limit` and `group_wait`.
+MRSK's default is to boot new containers on all hosts in parallel. But you can control this by configuring `group_limit` and `group_wait` as boot options:
 
 ```yaml
 service: myservice
 
-group_limit: 10
-group_wait: 30
+boot:
+  group_limit: 10
+  group_wait: 2
 ```
 
 When `group_limit` is specified, containers will be booted on, at most, `group_limit` hosts at once. MRSK will pause for `group_wait` seconds between batches.

lib/mrsk/cli/app.rb

@@ -13,7 +13,7 @@ class Mrsk::Cli::App < Mrsk::Cli::Base
           execute *MRSK.app.tag_current_as_latest
         end
 
-        on(MRSK.hosts, **MRSK.config.group_strategy) do |host|
+        on(MRSK.hosts, **MRSK.group_strategy) do |host|
           roles = MRSK.roles_on(host)
 
           roles.each do |role|

lib/mrsk/commander.rb

@@ -51,6 +51,14 @@ class Mrsk::Commander
     end
   end
 
+  def group_strategy
+    if config.boot.group_limit.present?
+      { in: :groups, limit: config.boot.group_limit, wait: config.boot.group_wait }
+    else
+      {}
+    end
+  end
+
   def roles_on(host)
     roles.select { |role| role.hosts.include?(host.to_s) }.map(&:name)
   end

lib/mrsk/configuration.rb

@@ -87,6 +87,10 @@ class Mrsk::Configuration
     roles.select(&:running_traefik?).flat_map(&:hosts).uniq
   end
 
+  def boot
+    Mrsk::Configuration::Boot.new(section: raw_config.boot)
+  end
+
 
   def repository
     [ raw_config.registry["server"], image ].compact.join("/")
@@ -153,15 +157,6 @@ class Mrsk::Configuration
   end
 
 
-  def group_strategy
-    if group_limit.present?
-      { in: :groups, limit: group_limit, wait: group_wait }
-    else
-      {}
-    end
-  end
-
-
   def audit_broadcast_cmd
     raw_config.audit_broadcast_cmd
   end
@@ -246,12 +241,4 @@ class Mrsk::Configuration
           raise "Can't use commit hash as version, no git repository found in #{Dir.pwd}"
         end
     end
-
-    def group_limit
-      raw_config.group_limit&.to_i
-    end
-
-    def group_wait
-      raw_config.group_wait&.to_i
-    end
 end

lib/mrsk/configuration/boot.rb

@@ -0,0 +1,9 @@
+class Mrsk::Configuration::Boot
+  attr_reader :group_wait, :group_limit
+
+  def initialize(section:)
+    section = section || {}
+    @group_limit = section["group_limit"]
+    @group_wait = section["group_wait"]
+  end
+end

test/fixtures/deploy_with_group_strategy.yml

@@ -12,5 +12,6 @@ registry:
   username: user
   password: pw
 
-group_limit: 3
-group_wait: 30
+boot:
+  group_limit: 3
+  group_wait: 30