exec

type Cmd interface {
	// CombinedOutput runs the command and returns its combined standard output
	// and standard error.  This follows the pattern of package os/exec.
	CombinedOutput() ([]byte, error)
	// Output runs the command and returns standard output, but not standard err
	Output() ([]byte, error)
	SetDir(dir string)
	SetStdin(in io.Reader)
	SetStdout(out io.Writer)
	// Stops the command by sending SIGTERM. It is not guaranteed the
	// process will stop before this function returns. If the process is not
	// responding, an internal timer function will send a SIGKILL to force
	// terminate after 10 seconds.
	Stop()
}

type CodeExitError struct {
	Err  error
	Code int
}

type ExitError interface {
	String() string
	Error() string
	Exited() bool
	ExitStatus() int
}

type ExitErrorWrapper struct {
	*osexec.ExitError
}

type FakeCmd struct {
	Argv                 []string
	CombinedOutputScript []FakeCombinedOutputAction
	CombinedOutputCalls  int
	CombinedOutputLog    [][]string
	Dirs                 []string
	Stdin                io.Reader
	Stdout               io.Writer
}

type FakeCombinedOutputAction func() ([]byte, error)

type FakeCommandAction func(cmd string, args ...string) Cmd

type FakeExec struct {
	CommandScript []FakeCommandAction
	CommandCalls  int
	LookPathFunc  func(string) (string, error)
}

type FakeExitError struct {
	Status int
}

type Interface interface {
	// Command returns a Cmd instance which can be used to run a single command.
	// This follows the pattern of package os/exec.
	Command(cmd string, args ...string) Cmd

	// LookPath wraps os/exec.LookPath
	LookPath(file string) (string, error)
}