class Vagrant::Util::Which
Public Class Methods
which(cmd, **opts)
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Cross-platform way of finding an executable in the PATH.
which('ruby') #=> /usr/bin/ruby
This code is adapted from the following post by mislav:
http://stackoverflow.com/questions/2108727/which-in-ruby-checking-if-program-exists-in-path-from-ruby
@param [String] cmd The command to search for in the PATH. @param [Hash] opts Optional flags
@option [Boolean] :original_path Search within original path if available
@return [String] The full path to the executable or ‘nil` if not found.
# File lib/vagrant/util/which.rb, line 17 def self.which(cmd, **opts) exts = nil if !Platform.windows? || ENV['PATHEXT'].nil? # If the PATHEXT variable is empty, we're on *nix and need to find # the exact filename exts = [''] elsif File.extname(cmd).length != 0 # On Windows: if filename contains an extension, we must match that # exact filename exts = [''] else # On Windows: otherwise try to match all possible executable file # extensions (.EXE .COM .BAT etc.) exts = ENV['PATHEXT'].split(';') end if opts[:original_path] search_path = ENV.fetch('VAGRANT_OLD_ENV_PATH', ENV['PATH']) else search_path = ENV['PATH'] end SilenceWarnings.silence! do search_path.encode('UTF-8', 'binary', invalid: :replace, undef: :replace, replace: '').split(File::PATH_SEPARATOR).each do |path| exts.each do |ext| exe = "#{path}#{File::SEPARATOR}#{cmd}#{ext}" return exe if File.executable? exe end end end return nil end