fix linter

dock0.gemspec

@@ -5,17 +5,17 @@ require 'dock0/version'
 Gem::Specification.new do |s|
   s.name        = 'dock0'
   s.version     = Dock0::VERSION
-  s.date        = Time.now.strftime('%Y-%m-%d')
+
+  s.required_ruby_version = '>= 3.0'
 
   s.summary     = 'Builds a read-only Arch host for Docker'
-  s.description = 'Generates a read-only Arch host for running Docker containers' # rubocop:disable Metrics/LineLength
+  s.description = 'Generates a read-only Arch host for running Docker containers'
   s.authors     = ['Les Aker']
   s.email       = 'me@lesaker.org'
   s.homepage    = 'https://github.com/aker/dock0'
   s.license     = 'MIT'
 
   s.files       = `git ls-files`.split
-  s.test_files  = `git ls-files spec/*`.split
   s.executables = ['dock0']
 
   s.add_dependency 'cymbal', '~> 2.0.0'
@@ -24,4 +24,5 @@ Gem::Specification.new do |s|
   s.add_dependency 'mercenary', '~> 0.4.0'
 
   s.add_development_dependency 'goodcop', '~> 0.9.7'
+  s.metadata['rubygems_mfa_required'] = 'true'
 end

lib/dock0.rb

@@ -30,7 +30,7 @@ class Base
 
     def initialize(*configs)
       @config = configs.each_with_object(default_config) do |path, obj|
-        new = YAML.safe_load(File.read(path))
+        new = YAML.safe_load_file(path)
         next unless new
         obj.deep_merge! Cymbal.symbolize(new)
       end
@@ -57,11 +57,11 @@ def render_templates(prefix)
       templates.each do |path|
         puts "Templating #{path}"
         template = File.read "#{@paths[:templates]}/#{path}"
-        parsed = ERB.new(template, nil, '<>').result(binding)
+        parsed = ERB.new(template, trim_mode: '<>').result(binding)
 
         target_path = "#{@paths[:build]}/#{prefix}/#{path}"
         FileUtils.mkdir_p File.dirname(target_path)
-        File.open(target_path, 'w') { |fh| fh.write parsed }
+        File.write(target_path, parsed)
       end
     end
 
@@ -70,7 +70,7 @@ def run_script(script)
     end
 
     def run_scripts
-      Dir.glob(@paths[:scripts] + '/*.rb').sort.each do |script|
+      Dir.glob("#{@paths[:scripts]}/*.rb").each do |script|
         puts "Running #{script}"
         run_script script
       end

lib/dock0/image.rb

@@ -47,7 +47,7 @@ def install_packages
 
     def apply_overlay
       puts "Applying overlay from #{@paths[:overlay]}"
-      overlay_path = @paths[:overlay] + '/.'
+      overlay_path = "#{@paths[:overlay]}/."
       FileUtils.cp_r overlay_path, @paths[:build]
     end