Use version 0.1.0 of kamal-proxy and add minimum version check

lib/kamal/cli/proxy.rb

@@ -10,6 +10,12 @@ class Kamal::Cli::Proxy < Kamal::Cli::Base
 
       on(KAMAL.proxy_hosts) do |host|
         execute *KAMAL.registry.login
+
+        version = capture_with_info(*KAMAL.proxy.version).strip.presence
+
+        if version && Kamal::Utils.older_version?(version, Kamal::Configuration::Proxy::MINIMUM_VERSION)
+          raise "kamal-proxy version #{version} is too old, please reboot to update to at least #{Kamal::Configuration::Proxy::MINIMUM_VERSION}"
+        end
         execute *KAMAL.proxy.start_or_run
       end
     end

lib/kamal/commands/proxy.rb

@@ -46,6 +46,12 @@ class Kamal::Commands::Proxy < Kamal::Commands::Base
     docker :ps, "--filter", "name=^#{container_name}$"
   end
 
+  def version
+    pipe \
+      docker(:inspect, container_name, "--format '{{.Config.Image}}'"),
+      [ :cut, "-d:", "-f2" ]
+  end
+
   def logs(since: nil, lines: nil, grep: nil, grep_options: nil)
     pipe \
       docker(:logs, container_name, (" --since #{since}" if since), (" --tail #{lines}" if lines), "--timestamps", "2>&1"),

lib/kamal/configuration/proxy.rb

@@ -1,9 +1,10 @@
 class Kamal::Configuration::Proxy
   include Kamal::Configuration::Validation
 
+  MINIMUM_VERSION = "v0.1.0"
   DEFAULT_HTTP_PORT = 80
   DEFAULT_HTTPS_PORT = 443
-  DEFAULT_IMAGE = "basecamp/kamal-proxy:latest"
+  DEFAULT_IMAGE = "basecamp/kamal-proxy:#{MINIMUM_VERSION}"
   DEFAULT_LOG_REQUEST_HEADERS = [ "Cache-Control", "Last-Modified", "User-Agent" ]
 
   delegate :argumentize, :optionize, to: Kamal::Utils
@@ -62,7 +63,7 @@ class Kamal::Configuration::Proxy
   def config_volume
     Kamal::Configuration::Volume.new \
       host_path: File.join(config.proxy_directory, "config"),
-      container_path: "/root/.config/kamal-proxy"
+      container_path: "/home/kamal-proxy/.config/kamal-proxy"
   end
 
   private

lib/kamal/utils.rb

@@ -101,4 +101,8 @@ module Kamal::Utils
       arch
     end
   end
+
+  def older_version?(version, other_version)
+    Gem::Version.new(version.delete_prefix("v")) < Gem::Version.new(other_version.delete_prefix("v"))
+  end
 end