require "timeout" require "benchmark" module MiniMagick ## # Sends commands to the shell (more precisely, it sends commands directly to # the operating system). # # @private # class Shell def run(command, options = {}) stdout, stderr, status = execute(command, stdin: options[:stdin]) if status != 0 && options.fetch(:whiny, MiniMagick.whiny) fail MiniMagick::Error, "`#{command.join(" ")}` failed with status: #{status.inspect} and error:\n#{stderr}" end $stderr.print(stderr) unless options[:stderr] == false || stderr.strip == %(WARNING: The convert command is deprecated in IMv7, use "magick") [stdout, stderr, status] end def execute(command, options = {}) stdout, stderr, status = log(command.join(" ")) do send("execute_#{MiniMagick.shell_api.tr("-", "_")}", command, options) end [stdout, stderr, status&.exitstatus] rescue Errno::ENOENT, IOError ["", "executable not found: \"#{command.first}\"", 127] end private def execute_open3(command, options = {}) require "open3" # We would ideally use Open3.capture3, but it wouldn't allow us to # terminate the command after timing out. Open3.popen3(*command) do |in_w, out_r, err_r, thread| [in_w, out_r, err_r].each(&:binmode) stdout_reader = Thread.new { out_r.read } stderr_reader = Thread.new { err_r.read } begin in_w.write options[:stdin].to_s rescue Errno::EPIPE end in_w.close unless thread.join(MiniMagick.timeout) Process.kill("TERM", thread.pid) rescue nil Process.waitpid(thread.pid) rescue nil raise Timeout::Error, "MiniMagick command timed out: #{command}" end [stdout_reader.value, stderr_reader.value, thread.value] end end def execute_posix_spawn(command, options = {}) require "posix-spawn" child = POSIX::Spawn::Child.new(*command, input: options[:stdin].to_s, timeout: MiniMagick.timeout) [child.out, child.err, child.status] rescue POSIX::Spawn::TimeoutExceeded raise Timeout::Error, "MiniMagick command timed out: #{command}" end def log(command, &block) value = nil duration = Benchmark.realtime { value = block.call } MiniMagick.logger.debug "[%.2fs] %s" % [duration, command] value end end end