Put locks in a locks directory. Ensure that locks directory exits on a primary host.

lib/kamal/cli/base.rb

@@ -86,6 +86,8 @@ module Kamal::Cli
 
         ensure_run_directory
 
+        ensure_locks_directory
+
         acquire_lock
 
         begin
@@ -191,5 +193,11 @@ module Kamal::Cli
           execute(*KAMAL.server.ensure_run_directory)
         end
       end
+
+      def ensure_locks_directory
+        on(KAMAL.primary_host) do
+          execute(*KAMAL.lock.ensure_locks_directory)
+        end
+      end
   end
 end

lib/kamal/commands/lock.rb

@@ -21,6 +21,10 @@ class Kamal::Commands::Lock < Kamal::Commands::Base
       read_lock_details
   end
 
+  def ensure_locks_directory
+    [ :mkdir, "-p", locks_dir ]
+  end
+
   private
     def write_lock_details(message, version)
       write \
@@ -40,14 +44,18 @@ class Kamal::Commands::Lock < Kamal::Commands::Base
         "/dev/null"
     end
 
+    def locks_dir
+      File.join(config.run_directory, "locks")
+    end
+
     def lock_dir
       dir_name = [ config.service, config.destination ].compact.join("-")
 
-      "#{config.run_directory}/lock-#{dir_name}"
+      File.join(locks_dir, dir_name)
     end
 
     def lock_details_file
-      [ lock_dir, :details ].join("/")
+      File.join(lock_dir, "details")
     end
 
     def lock_details(message, version)