Module: CemAcpt::Utils::Shell

Defined in:
lib/cem_acpt/utils/shell.rb

Overview

Generic utilities for running local shell commands

Defined Under Namespace

Classes: Output, OutputData

Class Method Summary collapse

Class Method Details

.run_cmd(cmd, env = {}, output: $stdout, raise_on_fail: true, combine_out_err: true) ⇒ String

Runs a command in a subshell and returns the the string output of the command.



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# File 'lib/cem_acpt/utils/shell.rb', line 160

def self.run_cmd(cmd, env = {}, output: $stdout, raise_on_fail: true, combine_out_err: true)
  env.transform_keys!(&:to_s)
  output = Output.new(output: output, raise_on_fail: raise_on_fail, combine_out_err: combine_out_err)
  output.log_title = 'CemAcpt::Utils::Shell'
  output.debug("Running command:\n\t#{cmd}\nWith environment:\n\t#{env}")
  begin
    val = Open3.popen3(env, cmd) do |i, o, e, t|
      i.close
      o.sync = true
      e.sync = true
      files = [o, e]
      until files.all?(&:eof?)
        ready = IO.select(files)
        if ready
          ready[0].each do |f|
            data = f.read_nonblock(4096)
            if f == o
              output.write(data, :stdout)
            elsif f == e
              output.write(data, :stderr)
            end
          rescue IO::WaitReadable, EOFError
            next
          end
        end
      end
      t.value
    end
  ensure
    output.close unless output.closed?
  end
  if raise_on_fail && !val.success?
    raise CemAcpt::ShellCommandError, "Error running command: #{cmd}\n#{output.stdout.string}\n#{output.stderr.string}"
  end
  output.stdout.string
end

.which(cmd, include_ruby_bin: false, raise_if_not_found: false) ⇒ String?

Mimics the behavior of the which command.

Raises:



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# File 'lib/cem_acpt/utils/shell.rb', line 205

def self.which(cmd, include_ruby_bin: false, raise_if_not_found: false)
  return cmd if File.executable?(cmd) && !File.directory?(cmd)

  exts = ENV['PATHEXT'] ? ENV['PATHEXT'].split(';') : ['']
  ENV['PATH'].split(File::PATH_SEPARATOR).each do |path|
    next if path.include?('/ruby') && !include_ruby_bin

    exts.each do |ext|
      exe = File.join(path, "#{cmd}#{ext}")
      return exe if File.executable?(exe) && !File.directory?(exe)
    end
  end
  raise CemAcpt::ShellCommandNotFoundError, "Command #{cmd} not found in PATH" if raise_if_not_found

  nil
end