# Buggy code
def call(
    name,
    func,
    args=(),
    kws=None,
    onlyif=None,
    unless=None,
    creates=None,
    output_loglevel="debug",
    hide_output=False,
    use_vt=False,
    **kwargs,
):
    """
    Invoke a pre-defined Python function with arguments specified in the state
    declaration. This function is mainly used by the
    :mod:`salt.renderers.pydsl` renderer.

    The interpretation of ``onlyif`` and ``unless`` arguments are identical to
    those of :mod:`cmd.run <salt.states.cmd.run>`, and all other
    arguments(``cwd``, ``runas``, ...) allowed by :mod:`cmd.run
    <salt.states.cmd.run>` are allowed here, except that their effects apply
    only to the commands specified in `onlyif` and `unless` rather than to the
    function to be invoked.

    In addition, the ``stateful`` argument has no effects here.

    The return value of the invoked function will be interpreted as follows.

    If it's a dictionary then it will be passed through to the state system,
    which expects it to have the usual structure returned by any salt state
    function.

    Otherwise, the return value (denoted as ``result`` in the code below) is
    expected to be a JSON serializable object, and this dictionary is returned:

    .. code-block:: python

        {
            'name': name
            'changes': {'retval': result},
            'result': True if result is None else bool(result),
            'comment': result if isinstance(result, six.string_types) else ''
        }
    """
    ret = {"name": name, "changes": {}, "result": False, "comment": ""}

    cmd_kwargs = {
        "cwd": kwargs.get("cwd"),
        "runas": kwargs.get("user"),
        "shell": kwargs.get("shell") or __grains__["shell"],
        "env": kwargs.get("env"),
        "use_vt": use_vt,
        "output_loglevel": output_loglevel,
        "hide_output": hide_output,
        "umask": kwargs.get("umask"),
    }

    cret = mod_run_check(cmd_kwargs, onlyif, unless, creates)
    if isinstance(cret, dict):
        ret.update(cret)
        return ret

    if not kws:
        kws = {}
    result = func(*args, **kws)
    if isinstance(result, dict):
        ret.update(result)
        return ret
    else:
        # result must be JSON serializable else we get an error
        ret["changes"] = {"retval": result}
        ret["result"] = True if result is None else bool(result)
        if isinstance(result, six.string_types):
            ret["comment"] = result
        return ret


# Traceback (KeyError)
----------
ID: zsh_fail_1
Function: cmd.run
Name: echo hey
Result: False
Comment: An exception occurred in this state: Traceback (most recent call last):
File "/usr/lib/python3/dist-packages/salt/modules/cmdmod.py", line 442, in _run
pwd.getpwnam(runas)
KeyError: "getpwnam(): name not found: 'cristi'"

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
File "/usr/lib/python3/dist-packages/salt/state.py", line 1981, in call
**cdata['kwargs'])
File "/usr/lib/python3/dist-packages/salt/loader.py", line 1977, in wrapper
return f(*args, **kwargs)
File "/usr/lib/python3/dist-packages/salt/states/cmd.py", line 892, in run
cret = mod_run_check(cmd_kwargs, onlyif, unless, creates)
File "/usr/lib/python3/dist-packages/salt/states/cmd.py", line 366, in mod_run_check
cmd = __salt__['cmd.retcode'](unless, ignore_retcode=True, python_shell=True, **cmd_kwargs)
File "/usr/lib/python3/dist-packages/salt/modules/cmdmod.py", line 2277, in retcode
**kwargs)
File "/usr/lib/python3/dist-packages/salt/modules/cmdmod.py", line 445, in _run
'User \'{0}\' is not available'.format(runas)
salt.exceptions.CommandExecutionError: User 'cristi' is not available
Started: 11:52:32.097022
Duration: 9.035 ms
Changes:
----------
ID: zsh_test_1
Function: cmd.run
Name: echo "t1"
Result: True
Comment: Command "echo "t1"" run
Started: 11:52:32.106490
Duration: 37.838 ms
Changes:
----------
pid:
30057
retcode:
0
stderr:
stdout:
t1

# Fixed code
def call(
    name,
    func,
    args=(),
    kws=None,
    output_loglevel="debug",
    hide_output=False,
    use_vt=False,
    **kwargs,
):
    """
    Invoke a pre-defined Python function with arguments specified in the state
    declaration. This function is mainly used by the
    :mod:`salt.renderers.pydsl` renderer.

    In addition, the ``stateful`` argument has no effects here.

    The return value of the invoked function will be interpreted as follows.

    If it's a dictionary then it will be passed through to the state system,
    which expects it to have the usual structure returned by any salt state
    function.

    Otherwise, the return value (denoted as ``result`` in the code below) is
    expected to be a JSON serializable object, and this dictionary is returned:

    .. code-block:: python

        {
            'name': name
            'changes': {'retval': result},
            'result': True if result is None else bool(result),
            'comment': result if isinstance(result, six.string_types) else ''
        }
    """
    ret = {"name": name, "changes": {}, "result": False, "comment": ""}

    cmd_kwargs = {
        "cwd": kwargs.get("cwd"),
        "runas": kwargs.get("user"),
        "shell": kwargs.get("shell") or __grains__["shell"],
        "env": kwargs.get("env"),
        "use_vt": use_vt,
        "output_loglevel": output_loglevel,
        "hide_output": hide_output,
        "umask": kwargs.get("umask"),
    }

    if not kws:
        kws = {}
    result = func(*args, **kws)
    if isinstance(result, dict):
        ret.update(result)
        return ret
    else:
        # result must be JSON serializable else we get an error
        ret["changes"] = {"retval": result}
        ret["result"] = True if result is None else bool(result)
        if isinstance(result, six.string_types):
            ret["comment"] = result
        return ret