Merge pull request #149 from eagletmt/gem_binary-array

Allow array gem_binary

lib/itamae/resource/gem_package.rb

@@ -5,7 +5,7 @@ module Resource
     class GemPackage < Base
       define_attribute :action, default: :install
       define_attribute :package_name, type: String, default_name: true
-      define_attribute :gem_binary, type: String, default: 'gem'
+      define_attribute :gem_binary, type: [String, Array], default: 'gem'
       define_attribute :version, type: String
       define_attribute :source, type: String
 
@@ -51,7 +51,7 @@ def action_upgrade(action_options)
 
       def installed_gems
         gems = []
-        run_command([attributes.gem_binary, 'list', '-l']).stdout.each_line do |line|
+        run_command([*Array(attributes.gem_binary), 'list', '-l']).stdout.each_line do |line|
           if /\A([^ ]+) \(([^\)]+)\)\z/ =~ line.strip
             name = $1
             versions = $2.split(', ')
@@ -64,7 +64,7 @@ def installed_gems
       end
 
       def install!
-        cmd = [attributes.gem_binary, 'install']
+        cmd = [*Array(attributes.gem_binary), 'install']
         if attributes.version
           cmd << '-v' << attributes.version
         end