| #!/usr/bin/env python3 |
| |
| r""" |
| This module provides command execution functions such as cmd_fnc and cmd_fnc_u. |
| """ |
| |
| import os |
| import sys |
| import subprocess |
| import collections |
| import signal |
| import time |
| import re |
| import inspect |
| |
| import gen_print as gp |
| import gen_valid as gv |
| import gen_misc as gm |
| import func_args as fa |
| |
| robot_env = gp.robot_env |
| |
| if robot_env: |
| from robot.libraries.BuiltIn import BuiltIn |
| |
| |
| # cmd_fnc and cmd_fnc_u should now be considered deprecated. shell_cmd and t_shell_cmd should be used |
| # instead. |
| def cmd_fnc(cmd_buf, |
| quiet=None, |
| test_mode=None, |
| debug=0, |
| print_output=1, |
| show_err=1, |
| return_stderr=0, |
| ignore_err=1): |
| r""" |
| Run the given command in a shell and return the shell return code and the output. |
| |
| Description of arguments: |
| cmd_buf The command string to be run in a shell. |
| quiet Indicates whether this function should run the print_issuing() function |
| which prints "Issuing: <cmd string>" to stdout. |
| test_mode If test_mode is set, this function will not actually run the command. If |
| print_output is set, it will print "(test_mode) Issuing: <cmd string>" to |
| stdout. |
| debug If debug is set, this function will print extra debug info. |
| print_output If this is set, this function will print the stdout/stderr generated by |
| the shell command. |
| show_err If show_err is set, this function will print a standardized error report |
| if the shell command returns non-zero. |
| return_stderr If return_stderr is set, this function will process the stdout and stderr |
| streams from the shell command separately. It will also return stderr in |
| addition to the return code and the stdout. |
| """ |
| |
| # Determine default values. |
| quiet = int(gm.global_default(quiet, 0)) |
| test_mode = int(gm.global_default(test_mode, 0)) |
| |
| if debug: |
| gp.print_vars(cmd_buf, quiet, test_mode, debug) |
| |
| err_msg = gv.valid_value(cmd_buf) |
| if err_msg != "": |
| raise ValueError(err_msg) |
| |
| if not quiet: |
| gp.pissuing(cmd_buf, test_mode) |
| |
| if test_mode: |
| if return_stderr: |
| return 0, "", "" |
| else: |
| return 0, "" |
| |
| if return_stderr: |
| err_buf = "" |
| stderr = subprocess.PIPE |
| else: |
| stderr = subprocess.STDOUT |
| |
| sub_proc = subprocess.Popen(cmd_buf, |
| bufsize=1, |
| shell=True, |
| universal_newlines=True, |
| executable='/bin/bash', |
| stdout=subprocess.PIPE, |
| stderr=stderr) |
| out_buf = "" |
| if return_stderr: |
| for line in sub_proc.stderr: |
| try: |
| err_buf += line |
| except TypeError: |
| line = line.decode("utf-8") |
| err_buf += line |
| if not print_output: |
| continue |
| gp.gp_print(line) |
| for line in sub_proc.stdout: |
| try: |
| out_buf += line |
| except TypeError: |
| line = line.decode("utf-8") |
| out_buf += line |
| if not print_output: |
| continue |
| gp.gp_print(line) |
| if print_output and not robot_env: |
| sys.stdout.flush() |
| sub_proc.communicate() |
| shell_rc = sub_proc.returncode |
| if shell_rc != 0: |
| err_msg = "The prior shell command failed.\n" |
| err_msg += gp.sprint_var(shell_rc, gp.hexa()) |
| if not print_output: |
| err_msg += "out_buf:\n" + out_buf |
| |
| if show_err: |
| gp.print_error_report(err_msg) |
| if not ignore_err: |
| if robot_env: |
| BuiltIn().fail(err_msg) |
| else: |
| raise ValueError(err_msg) |
| |
| if return_stderr: |
| return shell_rc, out_buf, err_buf |
| else: |
| return shell_rc, out_buf |
| |
| |
| def cmd_fnc_u(cmd_buf, |
| quiet=None, |
| debug=None, |
| print_output=1, |
| show_err=1, |
| return_stderr=0, |
| ignore_err=1): |
| r""" |
| Call cmd_fnc with test_mode=0. See cmd_fnc (above) for details. |
| |
| Note the "u" in "cmd_fnc_u" stands for "unconditional". |
| """ |
| |
| return cmd_fnc(cmd_buf, test_mode=0, quiet=quiet, debug=debug, |
| print_output=print_output, show_err=show_err, |
| return_stderr=return_stderr, ignore_err=ignore_err) |
| |
| |
| def parse_command_string(command_string): |
| r""" |
| Parse a bash command-line command string and return the result as a dictionary of parms. |
| |
| This can be useful for answering questions like "What did the user specify as the value for parm x in the |
| command string?". |
| |
| This function expects the command string to follow the following posix conventions: |
| - Short parameters: |
| -<parm name><space><arg value> |
| - Long parameters: |
| --<parm name>=<arg value> |
| |
| The first item in the string will be considered to be the command. All values not conforming to the |
| specifications above will be considered positional parms. If there are multiple parms with the same |
| name, they will be put into a list (see illustration below where "-v" is specified multiple times). |
| |
| Description of argument(s): |
| command_string The complete command string including all parameters and arguments. |
| |
| Sample input: |
| |
| robot_cmd_buf: robot -v OPENBMC_HOST:dummy1 -v keyword_string:'Set |
| Auto Reboot no' -v lib_file_path:/home/user1/git/openbmc-test-automation/lib/utils.robot -v quiet:0 -v |
| test_mode:0 -v debug:0 --outputdir='/home/user1/status/children/' |
| --output=dummy1.Auto_reboot.170802.124544.output.xml --log=dummy1.Auto_reboot.170802.124544.log.html |
| --report=dummy1.Auto_reboot.170802.124544.report.html |
| /home/user1/git/openbmc-test-automation/extended/run_keyword.robot |
| |
| Sample output: |
| |
| robot_cmd_buf_dict: |
| robot_cmd_buf_dict[command]: robot |
| robot_cmd_buf_dict[v]: |
| robot_cmd_buf_dict[v][0]: OPENBMC_HOST:dummy1 |
| robot_cmd_buf_dict[v][1]: keyword_string:Set Auto Reboot no |
| robot_cmd_buf_dict[v][2]: |
| lib_file_path:/home/user1/git/openbmc-test-automation/lib/utils.robot |
| robot_cmd_buf_dict[v][3]: quiet:0 |
| robot_cmd_buf_dict[v][4]: test_mode:0 |
| robot_cmd_buf_dict[v][5]: debug:0 |
| robot_cmd_buf_dict[outputdir]: /home/user1/status/children/ |
| robot_cmd_buf_dict[output]: dummy1.Auto_reboot.170802.124544.output.xml |
| robot_cmd_buf_dict[log]: dummy1.Auto_reboot.170802.124544.log.html |
| robot_cmd_buf_dict[report]: dummy1.Auto_reboot.170802.124544.report.html |
| robot_cmd_buf_dict[positional]: |
| /home/user1/git/openbmc-test-automation/extended/run_keyword.robot |
| """ |
| |
| # We want the parms in the string broken down the way bash would do it, so we'll call upon bash to do |
| # that by creating a simple inline bash function. |
| bash_func_def = "function parse { for parm in \"${@}\" ; do" +\ |
| " echo $parm ; done ; }" |
| |
| rc, outbuf = cmd_fnc_u(bash_func_def + " ; parse " + command_string, |
| quiet=1, print_output=0) |
| command_string_list = outbuf.rstrip("\n").split("\n") |
| |
| command_string_dict = collections.OrderedDict() |
| ix = 1 |
| command_string_dict['command'] = command_string_list[0] |
| while ix < len(command_string_list): |
| if command_string_list[ix].startswith("--"): |
| key, value = command_string_list[ix].split("=") |
| key = key.lstrip("-") |
| elif command_string_list[ix].startswith("-"): |
| key = command_string_list[ix].lstrip("-") |
| ix += 1 |
| try: |
| value = command_string_list[ix] |
| except IndexError: |
| value = "" |
| else: |
| key = 'positional' |
| value = command_string_list[ix] |
| if key in command_string_dict: |
| if isinstance(command_string_dict[key], str): |
| command_string_dict[key] = [command_string_dict[key]] |
| command_string_dict[key].append(value) |
| else: |
| command_string_dict[key] = value |
| ix += 1 |
| |
| return command_string_dict |
| |
| |
| # Save the original SIGALRM handler for later restoration by shell_cmd. |
| original_sigalrm_handler = signal.getsignal(signal.SIGALRM) |
| |
| |
| def shell_cmd_timed_out(signal_number, |
| frame): |
| r""" |
| Handle an alarm signal generated during the shell_cmd function. |
| """ |
| |
| gp.dprint_executing() |
| global command_timed_out |
| command_timed_out = True |
| # Get subprocess pid from shell_cmd's call stack. |
| sub_proc = gp.get_stack_var('sub_proc', 0) |
| pid = sub_proc.pid |
| gp.dprint_var(pid) |
| # Terminate the child process group. |
| os.killpg(pid, signal.SIGKILL) |
| # Restore the original SIGALRM handler. |
| signal.signal(signal.SIGALRM, original_sigalrm_handler) |
| |
| return |
| |
| |
| def shell_cmd(command_string, |
| quiet=None, |
| print_output=None, |
| show_err=1, |
| test_mode=0, |
| time_out=None, |
| max_attempts=1, |
| retry_sleep_time=5, |
| valid_rcs=[0], |
| ignore_err=None, |
| return_stderr=0, |
| fork=0, |
| error_regexes=None): |
| r""" |
| Run the given command string in a shell and return a tuple consisting of the shell return code and the |
| output. |
| |
| Description of argument(s): |
| command_string The command string to be run in a shell (e.g. "ls /tmp"). |
| quiet If set to 0, this function will print "Issuing: <cmd string>" to stdout. |
| When the quiet argument is set to None, this function will assign a |
| default value by searching upward in the stack for the quiet variable |
| value. If no such value is found, quiet is set to 0. |
| print_output If this is set, this function will print the stdout/stderr generated by |
| the shell command to stdout. |
| show_err If show_err is set, this function will print a standardized error report |
| if the shell command fails (i.e. if the shell command returns a shell_rc |
| that is not in valid_rcs). Note: Error text is only printed if ALL |
| attempts to run the command_string fail. In other words, if the command |
| execution is ultimately successful, initial failures are hidden. |
| test_mode If test_mode is set, this function will not actually run the command. If |
| print_output is also set, this function will print "(test_mode) Issuing: |
| <cmd string>" to stdout. A caller should call shell_cmd directly if they |
| wish to have the command string run unconditionally. They should call |
| the t_shell_cmd wrapper (defined below) if they wish to run the command |
| string only if the prevailing test_mode variable is set to 0. |
| time_out A time-out value expressed in seconds. If the command string has not |
| finished executing within <time_out> seconds, it will be halted and |
| counted as an error. |
| max_attempts The max number of attempts that should be made to run the command string. |
| retry_sleep_time The number of seconds to sleep between attempts. |
| valid_rcs A list of integers indicating which shell_rc values are not to be |
| considered errors. |
| ignore_err Ignore error means that a failure encountered by running the command |
| string will not be raised as a python exception. When the ignore_err |
| argument is set to None, this function will assign a default value by |
| searching upward in the stack for the ignore_err variable value. If no |
| such value is found, ignore_err is set to 1. |
| return_stderr If return_stderr is set, this function will process the stdout and stderr |
| streams from the shell command separately. In such a case, the tuple |
| returned by this function will consist of three values rather than just |
| two: rc, stdout, stderr. |
| fork Run the command string asynchronously (i.e. don't wait for status of the |
| child process and don't try to get stdout/stderr) and return the Popen |
| object created by the subprocess.popen() function. See the kill_cmd |
| function for details on how to process the popen object. |
| error_regexes A list of regular expressions to be used to identify errors in the |
| command output. If there is a match for any of these regular |
| expressions, the command will be considered a failure and the shell_rc |
| will be set to -1. For example, if error_regexes = ['ERROR:'] and the |
| command output contains 'ERROR: Unrecognized option', it will be counted |
| as an error even if the command returned 0. This is useful when running |
| commands that do not always return non-zero on error. |
| """ |
| |
| err_msg = gv.valid_value(command_string) |
| if err_msg: |
| raise ValueError(err_msg) |
| |
| # Assign default values to some of the arguments to this function. |
| quiet = int(gm.dft(quiet, gp.get_stack_var('quiet', 0))) |
| print_output = int(gm.dft(print_output, not quiet)) |
| show_err = int(show_err) |
| ignore_err = int(gm.dft(ignore_err, gp.get_stack_var('ignore_err', 1))) |
| |
| gp.qprint_issuing(command_string, test_mode) |
| if test_mode: |
| return (0, "", "") if return_stderr else (0, "") |
| |
| # Convert a string python dictionary definition to a dictionary. |
| valid_rcs = fa.source_to_object(valid_rcs) |
| # Convert each list entry to a signed value. |
| valid_rcs = [gm.to_signed(x) for x in valid_rcs] |
| |
| stderr = subprocess.PIPE if return_stderr else subprocess.STDOUT |
| |
| # Write all output to func_out_history_buf rather than directly to stdout. This allows us to decide |
| # what to print after all attempts to run the command string have been made. func_out_history_buf will |
| # contain the complete history from the current invocation of this function. |
| global command_timed_out |
| command_timed_out = False |
| func_out_history_buf = "" |
| for attempt_num in range(1, max_attempts + 1): |
| sub_proc = subprocess.Popen(command_string, |
| bufsize=1, |
| shell=True, |
| universal_newlines=True, |
| executable='/bin/bash', |
| stdin=subprocess.PIPE, |
| stdout=subprocess.PIPE, |
| stderr=stderr) |
| if fork: |
| return sub_proc |
| |
| if time_out: |
| command_timed_out = False |
| # Designate a SIGALRM handling function and set alarm. |
| signal.signal(signal.SIGALRM, shell_cmd_timed_out) |
| signal.alarm(time_out) |
| try: |
| stdout_buf, stderr_buf = sub_proc.communicate() |
| except IOError: |
| command_timed_out = True |
| # Restore the original SIGALRM handler and clear the alarm. |
| signal.signal(signal.SIGALRM, original_sigalrm_handler) |
| signal.alarm(0) |
| |
| # Output from this loop iteration is written to func_out_buf for later processing. This can include |
| # stdout, stderr and our own error messages. |
| func_out_buf = "" |
| if print_output: |
| if return_stderr: |
| func_out_buf += stderr_buf |
| func_out_buf += stdout_buf |
| shell_rc = sub_proc.returncode |
| if shell_rc in valid_rcs: |
| # Check output for text indicating there is an error. |
| if error_regexes and re.match('|'.join(error_regexes), stdout_buf): |
| shell_rc = -1 |
| else: |
| break |
| err_msg = "The prior shell command failed.\n" |
| err_msg += gp.sprint_var(attempt_num) |
| err_msg += gp.sprint_vars(command_string, command_timed_out, time_out) |
| err_msg += gp.sprint_varx("child_pid", sub_proc.pid) |
| err_msg += gp.sprint_vars(shell_rc, valid_rcs, fmt=gp.hexa()) |
| if error_regexes: |
| err_msg += gp.sprint_vars(error_regexes) |
| if not print_output: |
| if return_stderr: |
| err_msg += "stderr_buf:\n" + stderr_buf |
| err_msg += "stdout_buf:\n" + stdout_buf |
| if show_err: |
| func_out_buf += gp.sprint_error_report(err_msg) |
| if attempt_num < max_attempts: |
| cmd_buf = "time.sleep(" + str(retry_sleep_time) + ")" |
| if show_err: |
| func_out_buf += gp.sprint_issuing(cmd_buf) |
| exec(cmd_buf) |
| func_out_history_buf += func_out_buf |
| |
| if shell_rc in valid_rcs: |
| gp.gp_print(func_out_buf) |
| else: |
| if show_err: |
| gp.gp_print(func_out_history_buf, stream='stderr') |
| else: |
| # There is no error information to show so just print output from last loop iteration. |
| gp.gp_print(func_out_buf) |
| if not ignore_err: |
| # If the caller has already asked to show error info, avoid repeating that in the failure message. |
| err_msg = "The prior shell command failed.\n" if show_err \ |
| else err_msg |
| if robot_env: |
| BuiltIn().fail(err_msg) |
| else: |
| raise ValueError(err_msg) |
| |
| return (shell_rc, stdout_buf, stderr_buf) if return_stderr \ |
| else (shell_rc, stdout_buf) |
| |
| |
| def t_shell_cmd(command_string, **kwargs): |
| r""" |
| Search upward in the the call stack to obtain the test_mode argument, add it to kwargs and then call |
| shell_cmd and return the result. |
| |
| See shell_cmd prolog for details on all arguments. |
| """ |
| |
| if 'test_mode' in kwargs: |
| error_message = "Programmer error - test_mode is not a valid" +\ |
| " argument to this function." |
| gp.print_error_report(error_message) |
| exit(1) |
| |
| test_mode = int(gp.get_stack_var('test_mode', 0)) |
| kwargs['test_mode'] = test_mode |
| |
| return shell_cmd(command_string, **kwargs) |
| |
| |
| def kill_cmd(popen, sig=signal.SIGTERM): |
| r""" |
| Kill the subprocess represented by the Popen object and return a tuple consisting of the shell return |
| code and the output. |
| |
| This function is meant to be used as the follow-up for a call to shell_cmd(..., fork=1). |
| |
| Example: |
| popen = shell_cmd("some_pgm.py", fork=1) |
| ... |
| shell_rc, output = kill_cmd(popen) |
| |
| Description of argument(s): |
| popen A Popen object returned by the subprocess.Popen() command. |
| sig The signal to be sent to the child process. |
| """ |
| |
| gp.dprint_var(popen.pid) |
| os.killpg(popen.pid, sig) |
| stdout, stderr = popen.communicate() |
| shell_rc = popen.returncode |
| return (shell_rc, stdout, stderr) if stderr else (shell_rc, stdout) |
| |
| |
| def re_order_kwargs(stack_frame_ix, **kwargs): |
| r""" |
| Re-order the kwargs to match the order in which they were specified on a function invocation and return |
| as an ordered dictionary. |
| |
| Note that this re_order_kwargs function should not be necessary in python versions 3.6 and beyond. |
| |
| Example: |
| |
| The caller calls func1 like this: |
| |
| func1('mike', arg1='one', arg2='two', arg3='three') |
| |
| And func1 is defined as follows: |
| |
| def func1(first_arg, **kwargs): |
| |
| kwargs = re_order_kwargs(first_arg_num=2, stack_frame_ix=3, **kwargs) |
| |
| The kwargs dictionary before calling re_order_kwargs (where order is not guaranteed): |
| |
| kwargs: |
| kwargs[arg3]: three |
| kwargs[arg2]: two |
| kwargs[arg1]: one |
| |
| The kwargs dictionary after calling re_order_kwargs: |
| |
| kwargs: |
| kwargs[arg1]: one |
| kwargs[arg2]: two |
| kwargs[arg3]: three |
| |
| Note that the re-ordered kwargs match the order specified on the call to func1. |
| |
| Description of argument(s): |
| stack_frame_ix The stack frame of the function whose kwargs values must be re-ordered. |
| 0 is the stack frame of re_order_kwargs, 1 is the stack from of its |
| caller and so on. |
| kwargs The keyword argument dictionary which is to be re-ordered. |
| """ |
| |
| new_kwargs = collections.OrderedDict() |
| |
| # Get position number of first keyword on the calling line of code. |
| (args, varargs, keywords, locals) =\ |
| inspect.getargvalues(inspect.stack()[stack_frame_ix][0]) |
| first_kwarg_pos = 1 + len(args) |
| if varargs is not None: |
| first_kwarg_pos += len(locals[varargs]) |
| for arg_num in range(first_kwarg_pos, first_kwarg_pos + len(kwargs)): |
| # This will result in an arg_name value such as "arg1='one'". |
| arg_name = gp.get_arg_name(None, arg_num, stack_frame_ix + 2) |
| # Continuing with the prior example, the following line will result |
| # in key being set to 'arg1'. |
| key = arg_name.split('=')[0] |
| new_kwargs[key] = kwargs[key] |
| |
| return new_kwargs |
| |
| |
| def default_arg_delim(arg_dashes): |
| r""" |
| Return the default argument delimiter value for the given arg_dashes value. |
| |
| Note: this function is useful for functions that manipulate bash command line arguments (e.g. --parm=1 or |
| -parm 1). |
| |
| Description of argument(s): |
| arg_dashes The argument dashes specifier (usually, "-" or "--"). |
| """ |
| |
| if arg_dashes == "--": |
| return "=" |
| |
| return " " |
| |
| |
| def create_command_string(command, *pos_parms, **options): |
| r""" |
| Create and return a bash command string consisting of the given arguments formatted as text. |
| |
| The default formatting of options is as follows: |
| |
| <single dash><option name><space delim><option value> |
| |
| Example: |
| |
| -parm value |
| |
| The caller can change the kind of dashes/delimiters used by specifying "arg_dashes" and/or "arg_delims" |
| as options. These options are processed specially by the create_command_string function and do NOT get |
| inserted into the resulting command string. All options following the arg_dashes/arg_delims options will |
| then use the specified values for dashes/delims. In the special case of arg_dashes equal to "--", the |
| arg_delim will automatically be changed to "=". See examples below. |
| |
| Quoting rules: |
| |
| The create_command_string function will single quote option values as needed to prevent bash expansion. |
| If the caller wishes to defeat this action, they may single or double quote the option value themselves. |
| See examples below. |
| |
| pos_parms are NOT automatically quoted. The caller is advised to either explicitly add quotes or to use |
| the quote_bash_parm functions to quote any pos_parms. |
| |
| Examples: |
| |
| command_string = create_command_string('cd', '~') |
| |
| Result: |
| cd ~ |
| |
| Note that the pos_parm ("~") does NOT get quoted, as per the aforementioned rules. If quotes are |
| desired, they may be added explicitly by the caller: |
| |
| command_string = create_command_string('cd', '\'~\'') |
| |
| Result: |
| cd '~' |
| |
| command_string = create_command_string('grep', '\'^[^ ]*=\'', |
| '/tmp/myfile', i=None, m='1', arg_dashes='--', color='always') |
| |
| Result: |
| grep -i -m 1 --color=always '^[^ ]*=' /tmp/myfile |
| |
| In the preceding example, note the use of None to cause the "i" parm to be treated as a flag (i.e. no |
| argument value is generated). Also, note the use of arg_dashes to change the type of dashes used on all |
| subsequent options. The following example is equivalent to the prior. Note that quote_bash_parm is used |
| instead of including the quotes explicitly. |
| |
| command_string = create_command_string('grep', quote_bash_parm('^[^ ]*='), |
| '/tmp/myfile', i=None, m='1', arg_dashes='--', color='always') |
| |
| Result: |
| grep -i -m 1 --color=always '^[^ ]*=' /tmp/myfile |
| |
| In the following example, note the automatic quoting of the password option, as per the aforementioned |
| rules. |
| |
| command_string = create_command_string('my_pgm', '/tmp/myfile', i=None, |
| m='1', arg_dashes='--', password='${my_pw}') |
| |
| However, let's say that the caller wishes to have bash expand the password value. To achieve this, the |
| caller can use double quotes: |
| |
| command_string = create_command_string('my_pgm', '/tmp/myfile', i=None, |
| m='1', arg_dashes='--', password='"${my_pw}"') |
| |
| Result: |
| my_pgm -i -m 1 --password="${my_pw}" /tmp/myfile |
| |
| command_string = create_command_string('ipmitool', 'power status', |
| I='lanplus', C='3', 'p=623', U='root', P='0penBmc', H='xx.xx.xx.xx') |
| |
| Result: |
| ipmitool -I lanplus -C 3 -p 623 -U root -P 0penBmc -H xx.xx.xx.xx power status |
| |
| By default create_command_string will take measures to preserve the order of the callers options. In |
| some cases, this effort may fail (as when calling directly from a robot program). In this case, the |
| caller can accept the responsibility of keeping an ordered list of options by calling this function with |
| the last positional parm as some kind of dictionary (preferably an OrderedDict) and avoiding the use of |
| any actual option args. |
| |
| Example: |
| kwargs = collections.OrderedDict([('pass', 0), ('fail', 0)]) |
| command_string = create_command_string('my program', 'pos_parm1', kwargs) |
| |
| Result: |
| |
| my program -pass 0 -fail 0 pos_parm1 |
| |
| Note to programmers who wish to write a wrapper to this function: If the python version is less than |
| 3.6, to get the options to be processed correctly, the wrapper function must include a _stack_frame_ix_ |
| keyword argument to allow this function to properly re-order options: |
| |
| def create_ipmi_ext_command_string(command, **kwargs): |
| |
| return create_command_string('ipmitool', command, _stack_frame_ix_=2, |
| **kwargs) |
| |
| Example call of wrapper function: |
| |
| command_string = create_ipmi_ext_command_string('power status', I='lanplus') |
| |
| Description of argument(s): |
| command The command (e.g. "cat", "sort", "ipmitool", etc.). |
| pos_parms The positional parms for the command (e.g. PATTERN, FILENAME, etc.). |
| These will be placed at the end of the resulting command string. |
| options The command options (e.g. "-m 1", "--max-count=NUM", etc.). Note that if |
| the value of any option is None, then it will be understood to be a flag |
| (for which no value is required). |
| """ |
| |
| arg_dashes = "-" |
| delim = default_arg_delim(arg_dashes) |
| |
| command_string = command |
| |
| if len(pos_parms) > 0 and gp.is_dict(pos_parms[-1]): |
| # Convert pos_parms from tuple to list. |
| pos_parms = list(pos_parms) |
| # Re-assign options to be the last pos_parm value (which is a dictionary). |
| options = pos_parms[-1] |
| # Now delete the last pos_parm. |
| del pos_parms[-1] |
| else: |
| # Either get stack_frame_ix from the caller via options or set it to the default value. |
| stack_frame_ix = options.pop('_stack_frame_ix_', 1) |
| if gm.python_version < gm.ordered_dict_version: |
| # Re-establish the original options order as specified on the original line of code. This |
| # function depends on correct order. |
| options = re_order_kwargs(stack_frame_ix, **options) |
| for key, value in options.items(): |
| # Check for special values in options and process them. |
| if key == "arg_dashes": |
| arg_dashes = str(value) |
| delim = default_arg_delim(arg_dashes) |
| continue |
| if key == "arg_delim": |
| delim = str(value) |
| continue |
| # Format the options elements into the command string. |
| command_string += " " + arg_dashes + key |
| if value is not None: |
| command_string += delim |
| if re.match(r'^(["].*["]|[\'].*[\'])$', str(value)): |
| # Already quoted. |
| command_string += str(value) |
| else: |
| command_string += gm.quote_bash_parm(str(value)) |
| # Finally, append the pos_parms to the end of the command_string. Use filter to eliminate blank pos |
| # parms. |
| command_string = ' '.join([command_string] + list(filter(None, pos_parms))) |
| |
| return command_string |