From f1297887993435ff07f606fd23f0d3f5afe4b0ca Mon Sep 17 00:00:00 2001
From: Matthew Kent <matthew@37signals.com>
Date: Fri, 27 Oct 2023 08:53:02 -0700
Subject: [PATCH 1/3] Enable aliases for more DRY with roles.

---
 lib/kamal/configuration.rb | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/lib/kamal/configuration.rb b/lib/kamal/configuration.rb
index fc881c069..7cbe177c8 100644
--- a/lib/kamal/configuration.rb
+++ b/lib/kamal/configuration.rb
@@ -25,7 +25,7 @@ def load_config_files(*files)
 
       def load_config_file(file)
         if file.exist?
-          YAML.load(ERB.new(IO.read(file)).result).symbolize_keys
+          YAML.load(ERB.new(IO.read(file)).result, aliases: true).symbolize_keys
         else
           raise "Configuration file not found in #{file}"
         end

From 6a3aea63010d0e100d27d179a1f362875080120e Mon Sep 17 00:00:00 2001
From: Matthew Kent <matthew@37signals.com>
Date: Fri, 27 Oct 2023 09:31:55 -0700
Subject: [PATCH 2/3] Support running without a :web role.

Just pick the first one running traefik.
---
 lib/kamal/commands/healthcheck.rb | 2 +-
 lib/kamal/configuration.rb        | 2 +-
 2 files changed, 2 insertions(+), 2 deletions(-)

diff --git a/lib/kamal/commands/healthcheck.rb b/lib/kamal/commands/healthcheck.rb
index 5adc02445..f7bc867d2 100644
--- a/lib/kamal/commands/healthcheck.rb
+++ b/lib/kamal/commands/healthcheck.rb
@@ -1,7 +1,7 @@
 class Kamal::Commands::Healthcheck < Kamal::Commands::Base
 
   def run
-    web = config.role(:web)
+    web = config.role(:web) || config.roles.select(&:running_traefik?).first
 
     docker :run,
       "--detach",
diff --git a/lib/kamal/configuration.rb b/lib/kamal/configuration.rb
index 7cbe177c8..a8e1ae749 100644
--- a/lib/kamal/configuration.rb
+++ b/lib/kamal/configuration.rb
@@ -90,7 +90,7 @@ def all_hosts
   end
 
   def primary_web_host
-    role(:web).primary_host
+    (role(:web) || roles.select(&:running_traefik?).first).primary_host
   end
 
   def traefik_hosts

From 7b781d2e2c95717349e55d41c2c32f05902a474d Mon Sep 17 00:00:00 2001
From: Matthew Kent <matthew@37signals.com>
Date: Fri, 27 Oct 2023 10:24:24 -0700
Subject: [PATCH 3/3] Don't block on empty roles, they're harmless.

---
 lib/kamal/configuration.rb | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/lib/kamal/configuration.rb b/lib/kamal/configuration.rb
index a8e1ae749..2ba442601 100644
--- a/lib/kamal/configuration.rb
+++ b/lib/kamal/configuration.rb
@@ -249,7 +249,7 @@ def ensure_required_keys_present
 
       roles.each do |role|
         if role.hosts.empty?
-          raise ArgumentError, "No servers specified for the #{role.name} role"
+          puts "Warning: No servers specified for the #{role.name} role"
         end
       end