| #!/usr/bin/env python |
| |
| 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 gen_print as gp |
| import gen_valid as gv |
| import gen_misc as gm |
| |
| robot_env = gp.robot_env |
| |
| if robot_env: |
| import gen_robot_print as grp |
| 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.svalid_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, |
| 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, 1) |
| if not print_output: |
| err_msg += "out_buf:\n" + out_buf |
| |
| if show_err: |
| if robot_env: |
| grp.rprint_error_report(err_msg) |
| else: |
| 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() |
| # Get subprocess pid from shell_cmd's call stack. |
| sub_proc = gp.get_stack_var('sub_proc', 0) |
| pid = sub_proc.pid |
| # Terminate the child process. |
| os.kill(pid, signal.SIGTERM) |
| # 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, |
| allowed_shell_rcs=[0], |
| ignore_err=None, |
| return_stderr=0, |
| fork=0): |
| 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 |
| allowed_shell_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. |
| allowed_shell_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). |
| """ |
| |
| # 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', |
| gp.get_var_value(ignore_err, 1)))) |
| |
| err_msg = gv.svalid_value(command_string) |
| if err_msg != "": |
| raise ValueError(err_msg) |
| |
| if not quiet: |
| gp.print_issuing(command_string, test_mode) |
| |
| if test_mode: |
| if return_stderr: |
| return 0, "", "" |
| else: |
| return 0, "" |
| |
| # Convert each list entry to a signed value. |
| allowed_shell_rcs = [gm.to_signed(x) for x in allowed_shell_rcs] |
| |
| if return_stderr: |
| stderr = subprocess.PIPE |
| else: |
| stderr = subprocess.STDOUT |
| |
| shell_rc = 0 |
| out_buf = "" |
| err_buf = "" |
| # Write all output to func_history_stdout 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_history_stdout will contain the |
| # complete stdout history from the current invocation of this function. |
| func_history_stdout = "" |
| for attempt_num in range(1, max_attempts + 1): |
| sub_proc = subprocess.Popen(command_string, |
| bufsize=1, |
| shell=True, |
| executable='/bin/bash', |
| stdout=subprocess.PIPE, |
| stderr=stderr) |
| out_buf = "" |
| err_buf = "" |
| # Output from this loop iteration is written to func_stdout for later |
| # processing. |
| func_stdout = "" |
| if fork: |
| break |
| command_timed_out = False |
| if time_out is not None: |
| # Designate a SIGALRM handling function and set alarm. |
| signal.signal(signal.SIGALRM, shell_cmd_timed_out) |
| signal.alarm(time_out) |
| try: |
| 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 |
| func_stdout += 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 |
| func_stdout += line |
| except IOError: |
| command_timed_out = True |
| sub_proc.communicate() |
| shell_rc = sub_proc.returncode |
| # Restore the original SIGALRM handler and clear the alarm. |
| signal.signal(signal.SIGALRM, original_sigalrm_handler) |
| signal.alarm(0) |
| if shell_rc in allowed_shell_rcs: |
| break |
| err_msg = "The prior shell command failed.\n" |
| if quiet: |
| err_msg += gp.sprint_var(command_string) |
| if command_timed_out: |
| err_msg += gp.sprint_var(command_timed_out) |
| err_msg += gp.sprint_var(time_out) |
| err_msg += gp.sprint_varx("child_pid", sub_proc.pid) |
| err_msg += gp.sprint_var(attempt_num) |
| err_msg += gp.sprint_var(shell_rc, 1) |
| err_msg += gp.sprint_var(allowed_shell_rcs, 1) |
| if not print_output: |
| if return_stderr: |
| err_msg += "err_buf:\n" + err_buf |
| err_msg += "out_buf:\n" + out_buf |
| if show_err: |
| if robot_env: |
| func_stdout += grp.sprint_error_report(err_msg) |
| else: |
| func_stdout += gp.sprint_error_report(err_msg) |
| func_history_stdout += func_stdout |
| if attempt_num < max_attempts: |
| func_history_stdout += gp.sprint_issuing("time.sleep(" |
| + str(retry_sleep_time) |
| + ")") |
| time.sleep(retry_sleep_time) |
| |
| if shell_rc not in allowed_shell_rcs: |
| func_stdout = func_history_stdout |
| |
| if robot_env: |
| grp.rprint(func_stdout) |
| else: |
| sys.stdout.write(func_stdout) |
| sys.stdout.flush() |
| |
| if shell_rc not in allowed_shell_rcs: |
| if not ignore_err: |
| if robot_env: |
| BuiltIn().fail(err_msg) |
| else: |
| raise ValueError("The prior shell command failed.\n") |
| |
| if return_stderr: |
| return shell_rc, out_buf, err_buf |
| else: |
| return shell_rc, out_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 = gp.get_stack_var('test_mode', |
| int(gp.get_var_value(None, 0, "test_mode"))) |
| kwargs['test_mode'] = test_mode |
| |
| return shell_cmd(command_string, **kwargs) |