Dump the quoted version of the command to the screen.

This lets you copy-paste the output which is convenient when debugging
these sorts of programs.

sh.py

@@ -58,6 +58,7 @@
     from io import StringIO
     from io import BytesIO as cStringIO
     from queue import Queue, Empty
+    from shlex import quote as shlex_quote
 
     # for some reason, python 3.1 removed the builtin "callable", wtf
     if not hasattr(__builtins__, "callable"):
@@ -67,6 +68,7 @@ def callable(ob):
     from StringIO import StringIO
     from cStringIO import OutputType as cStringIO
     from Queue import Queue, Empty
+    from pipes import quote as shlex_quote
 
 IS_OSX = platform.system() == "Darwin"
 THIS_DIR = os.path.dirname(os.path.realpath(__file__))
@@ -1332,7 +1334,7 @@ def __init__(self, parent_log, cmd, stdin, stdout, stderr, call_args, pipe):
                 if stderr is not OProc.STDOUT:
                     os.close(self._slave_stderr_fd)
 
-            self.log.debug('started "%r"', cmd)
+            self.log.info('started %s', ' '.join([shlex_quote(arg) for arg in cmd]))
 
             if self.call_args["tty_in"]:
                 attr = termios.tcgetattr(self._stdin_fd)