Clean up debug logging around _low_level_execute_command

We were logging the command to be executed many times, which made debug
logs very hard to read. Now we do it only once.

Also makes the logged ssh command line cut-and-paste-able (the lack of
which has confused a number of people by now; the problem being that we
pass the command as a single argument to execve(), so it doesn't need an
extra level of quoting as it does when you try to run it by hand).

lib/ansible/plugins/action/__init__.py

@@ -207,9 +207,7 @@ class ActionBase(with_metaclass(ABCMeta, object)):
             tmp_mode = 0o755
 
         cmd = self._connection._shell.mkdtemp(basefile, use_system_tmp, tmp_mode)
-        display.debug("executing _low_level_execute_command to create the tmp path")
         result = self._low_level_execute_command(cmd, sudoable=False)
-        display.debug("done with creation of tmp path")
 
         # error handling on this seems a little aggressive?
         if result['rc'] != 0:
@@ -254,9 +252,7 @@ class ActionBase(with_metaclass(ABCMeta, object)):
             cmd = self._connection._shell.remove(tmp_path, recurse=True)
             # If we have gotten here we have a working ssh configuration.
             # If ssh breaks we could leave tmp directories out on the remote system.
-            display.debug("calling _low_level_execute_command to remove the tmp path")
             self._low_level_execute_command(cmd, sudoable=False)
-            display.debug("done removing the tmp path")
 
     def _transfer_data(self, remote_path, data):
         '''
@@ -291,9 +287,7 @@ class ActionBase(with_metaclass(ABCMeta, object)):
         '''
 
         cmd = self._connection._shell.chmod(mode, path)
-        display.debug("calling _low_level_execute_command to chmod the remote path")
         res = self._low_level_execute_command(cmd, sudoable=sudoable)
-        display.debug("done with chmod call")
         return res
 
     def _remote_checksum(self, path, all_vars):
@@ -304,9 +298,7 @@ class ActionBase(with_metaclass(ABCMeta, object)):
         python_interp = all_vars.get('ansible_python_interpreter', 'python')
 
         cmd = self._connection._shell.checksum(path, python_interp)
-        display.debug("calling _low_level_execute_command to get the remote checksum")
         data = self._low_level_execute_command(cmd, sudoable=True)
-        display.debug("done getting the remote checksum")
         try:
             data2 = data['stdout'].strip().splitlines()[-1]
             if data2 == u'':
@@ -334,9 +326,7 @@ class ActionBase(with_metaclass(ABCMeta, object)):
                 expand_path = '~%s' % self._play_context.become_user
 
         cmd = self._connection._shell.expand_user(expand_path)
-        display.debug("calling _low_level_execute_command to expand the remote user path")
         data = self._low_level_execute_command(cmd, sudoable=False)
-        display.debug("done expanding the remote user path")
         #initial_fragment = utils.last_non_blank_line(data['stdout'])
         initial_fragment = data['stdout'].strip().splitlines()[-1]
 
@@ -453,9 +443,7 @@ class ActionBase(with_metaclass(ABCMeta, object)):
             # specified in the play, not the sudo_user
             sudoable = False
 
-        display.debug("calling _low_level_execute_command() for command %s" % cmd)
         res = self._low_level_execute_command(cmd, sudoable=sudoable, in_data=in_data)
-        display.debug("_low_level_execute_command returned ok")
 
         if tmp and "tmp" in tmp and not C.DEFAULT_KEEP_REMOTE_FILES and not persist_files and delete_remote_tmp:
             if self._play_context.become and self._play_context.become_user != 'root':
@@ -504,21 +492,20 @@ class ActionBase(with_metaclass(ABCMeta, object)):
         if executable is not None:
             cmd = executable + ' -c ' + cmd
 
-        display.debug("in _low_level_execute_command() (%s)" % (cmd,))
+        display.debug("_low_level_execute_command(): starting")
         if not cmd:
             # this can happen with powershell modules when there is no analog to a Windows command (like chmod)
-            display.debug("no command, exiting _low_level_execute_command()")
+            display.debug("_low_level_execute_command(): no command, exiting")
             return dict(stdout='', stderr='')
 
         allow_same_user = C.BECOME_ALLOW_SAME_USER
         same_user = self._play_context.become_user == self._play_context.remote_user
         if sudoable and self._play_context.become and (allow_same_user or not same_user):
-            display.debug("using become for this command")
+            display.debug("_low_level_execute_command(): using become for this command")
             cmd = self._play_context.make_become_cmd(cmd, executable=executable)
 
-        display.debug("executing the command %s through the connection" % cmd)
+        display.debug("_low_level_execute_command(): executing: %s" % (cmd,))
         rc, stdout, stderr = self._connection.exec_command(cmd, in_data=in_data, sudoable=sudoable)
-        display.debug("command execution done: rc=%s" % (rc))
 
         # stdout and stderr may be either a file-like or a bytes object.
         # Convert either one to a text type
@@ -536,11 +523,11 @@ class ActionBase(with_metaclass(ABCMeta, object)):
         else:
             err = stderr
 
-        display.debug("stdout=%s, stderr=%s" % (stdout, stderr))
-        display.debug("done with _low_level_execute_command() (%s)" % (cmd,))
         if rc is None:
             rc = 0
 
+        display.debug("_low_level_execute_command() done: rc=%d, stdout=%s, stderr=%s" % (rc, stdout, stderr))
+
         return dict(rc=rc, stdout=out, stdout_lines=out.splitlines(), stderr=err)
 
     def _get_first_available_file(self, faf, of=None, searchdir='files'):

lib/ansible/plugins/connection/ssh.py

@@ -319,7 +319,7 @@ class Connection(ConnectionBase):
         Starts the command and communicates with it until it ends.
         '''
 
-        display_cmd = map(pipes.quote, cmd[:-1]) + [cmd[-1]]
+        display_cmd = map(pipes.quote, cmd)
         display.vvv('SSH: EXEC {0}'.format(' '.join(display_cmd)), host=self.host)
 
         # Start the given command. If we don't need to pipeline data, we can try