1 files changed, 47 insertions, 0 deletions
diff --git a/chef-helpers/lib/chef-helpers/which.rb b/chef-helpers/lib/chef-helpers/which.rb
new file mode 100644
index 0000000000..e0a48f564c
--- /dev/null
+++ b/chef-helpers/lib/chef-helpers/which.rb
@@ -0,0 +1,47 @@
+#
+# Copyright:: Copyright 2018-2018, Chef Software Inc.
+# License:: Apache License, Version 2.0
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#     http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+#
+
+require 'chef-helpers/internal'
+require 'chef-helpers/which'
+
+module ChefHelpers
+  module Which
+    extend self
+
+    def which(*cmds, extra_path: nil, &block)
+      where(*cmds, extra_path: extra_path, &block).first || false
+    end
+
+    def where(*cmds, extra_path: nil, &block)
+      extra_path ||= PathSanity.sanitized_path
+      paths = Internal.env_path.split(::File::PATH_SEPARATOR) + Array(extra_path)
+      cmds.map do |cmd|
+        paths.map do |path|
+          filename = ::File.join(path, cmd)
+          filename if Which.valid_executable?(filename, &block)
+        end.compact
+      end.flatten
+    end
+
+    class << self
+      def valid_executable?(filename, &block)
+        return false unless ::File.executable?(filename) && !::File.directory?(filename)
+        block ? yield(filename) : true
+      end
+    end
+  end
+end