use configured ansible_shell_executable

refine args/shell/executable hanlding

lib/ansible/module_utils/basic.py

@@ -800,6 +800,7 @@ def __init__(self, argument_spec, bypass_checks=False, no_log=False,
         self._debug = False
         self._diff = False
         self._socket_path = None
+        self._shell = None
         self._verbosity = 0
         # May be used to set modifications to the environment for any
         # run_command invocation
@@ -810,7 +811,7 @@ def __init__(self, argument_spec, bypass_checks=False, no_log=False,
         self.aliases = {}
         self._legal_inputs = ['_ansible_check_mode', '_ansible_no_log', '_ansible_debug', '_ansible_diff', '_ansible_verbosity',
                               '_ansible_selinux_special_fs', '_ansible_module_name', '_ansible_version', '_ansible_syslog_facility',
-                              '_ansible_socket']
+                              '_ansible_socket', '_ansible_shell_executable']
         self._options_context = list()
 
         if add_file_common_args:
@@ -1612,6 +1613,9 @@ def _check_arguments(self, check_invalid_arguments, spec=None, param=None, legal
             elif k == '_ansible_socket':
                 self._socket_path = v
 
+            elif k == '_ansible_shell_executable' and v:
+                self._shell = v
+
             elif check_invalid_arguments and k not in legal_inputs:
                 unsupported_parameters.add(k)
 
@@ -2602,33 +2606,37 @@ def run_command(self, args, check_rc=False, close_fds=True, executable=None, dat
             strings on python3, use encoding=None to turn decoding to text off.
         '''
 
-        if isinstance(args, list):
-            if use_unsafe_shell:
+        if not isinstance(args, (list, binary_type, text_type)):
+            msg = "Argument 'args' to run_command must be list or string"
+            self.fail_json(rc=257, cmd=args, msg=msg)
+
+        shell = False
+        if use_unsafe_shell:
+
+            # stringify args for unsafe/direct shell usage
+            if isinstance(args, list):
                 args = " ".join([shlex_quote(x) for x in args])
-                shell = True
-        elif isinstance(args, (binary_type, text_type)):
-            if use_unsafe_shell:
-                shell = True
+
+            # not set explicitly, check if set by controller
+            if executable:
+                args = [executable, '-c', args]
+            elif self._shell not in (None, '/bin/sh'):
+                args = [self._shell, '-c', args]
             else:
+                shell = True
+        else:
+            # ensure args are a list
+            if isinstance(args, (binary_type, text_type)):
                 # On python2.6 and below, shlex has problems with text type
                 # On python3, shlex needs a text type.
                 if PY2:
                     args = to_bytes(args, errors='surrogate_or_strict')
                 elif PY3:
                     args = to_text(args, errors='surrogateescape')
                 args = shlex.split(args)
-        else:
-            msg = "Argument 'args' to run_command must be list or string"
-            self.fail_json(rc=257, cmd=args, msg=msg)
 
-        shell = False
-        if use_unsafe_shell:
-            if executable is None:
-                executable = os.environ.get('SHELL')
-            if executable:
-                args = [executable, '-c', args]
-            else:
-                shell = True
+            # expand shellisms
+            args = [os.path.expanduser(os.path.expandvars(x)) for x in args if x is not None]
 
         prompt_re = None
         if prompt_regex:
@@ -2642,10 +2650,6 @@ def run_command(self, args, check_rc=False, close_fds=True, executable=None, dat
             except re.error:
                 self.fail_json(msg="invalid prompt regular expression given to run_command")
 
-        # expand things like $HOME and ~
-        if not shell:
-            args = [os.path.expanduser(os.path.expandvars(x)) for x in args if x is not None]
-
         rc = 0
         msg = None
         st_in = None

lib/ansible/plugins/action/__init__.py

@@ -607,6 +607,9 @@ def _update_module_args(self, module_name, module_args, task_vars):
         # give the module the socket for persistent connections
         module_args['_ansible_socket'] = task_vars.get('ansible_socket')
 
+        # make sure all commands use the designated shell executable
+        module_args['_ansible_shell_executable'] = self._play_context.executable
+
     def _execute_module(self, module_name=None, module_args=None, tmp=None, task_vars=None, persist_files=False, delete_remote_tmp=True, wrap_async=False):
         '''
         Transfer and run a module along with its arguments.