| # Copyright (c) 2009, Google Inc. All rights reserved. |
| # Copyright (c) 2009 Apple Inc. All rights reserved. |
| # |
| # Redistribution and use in source and binary forms, with or without |
| # modification, are permitted provided that the following conditions are |
| # met: |
| # |
| # * Redistributions of source code must retain the above copyright |
| # notice, this list of conditions and the following disclaimer. |
| # * Redistributions in binary form must reproduce the above |
| # copyright notice, this list of conditions and the following disclaimer |
| # in the documentation and/or other materials provided with the |
| # distribution. |
| # * Neither the name of Google Inc. nor the names of its |
| # contributors may be used to endorse or promote products derived from |
| # this software without specific prior written permission. |
| # |
| # THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS |
| # "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT |
| # LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR |
| # A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT |
| # OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, |
| # SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT |
| # LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, |
| # DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY |
| # THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT |
| # (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE |
| # OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
| |
| try: |
| # This API exists only in Python 2.6 and higher. :( |
| import multiprocessing |
| except ImportError: |
| multiprocessing = None |
| |
| import ctypes |
| import errno |
| import logging |
| import os |
| import platform |
| import StringIO |
| import signal |
| import subprocess |
| import sys |
| import time |
| |
| from webkitpy.common.system.deprecated_logging import tee |
| from webkitpy.common.system.filesystem import FileSystem |
| from webkitpy.python24 import versioning |
| |
| |
| _log = logging.getLogger("webkitpy.common.system") |
| |
| |
| class ScriptError(Exception): |
| |
| # This is a custom List.__str__ implementation to allow size limiting. |
| def _string_from_args(self, args, limit=100): |
| args_string = unicode(args) |
| # We could make this much fancier, but for now this is OK. |
| if len(args_string) > limit: |
| return args_string[:limit - 3] + "..." |
| return args_string |
| |
| def __init__(self, |
| message=None, |
| script_args=None, |
| exit_code=None, |
| output=None, |
| cwd=None): |
| if not message: |
| message = 'Failed to run "%s"' % self._string_from_args(script_args) |
| if exit_code: |
| message += " exit_code: %d" % exit_code |
| if cwd: |
| message += " cwd: %s" % cwd |
| |
| Exception.__init__(self, message) |
| self.script_args = script_args # 'args' is already used by Exception |
| self.exit_code = exit_code |
| self.output = output |
| self.cwd = cwd |
| |
| def message_with_output(self, output_limit=500): |
| if self.output: |
| if output_limit and len(self.output) > output_limit: |
| return u"%s\n\nLast %s characters of output:\n%s" % \ |
| (self, output_limit, self.output[-output_limit:]) |
| return u"%s\n\n%s" % (self, self.output) |
| return unicode(self) |
| |
| def command_name(self): |
| command_path = self.script_args |
| if type(command_path) is list: |
| command_path = command_path[0] |
| return os.path.basename(command_path) |
| |
| |
| def run_command(*args, **kwargs): |
| # FIXME: This should not be a global static. |
| # New code should use Executive.run_command directly instead |
| return Executive().run_command(*args, **kwargs) |
| |
| |
| class Executive(object): |
| |
| def _should_close_fds(self): |
| # We need to pass close_fds=True to work around Python bug #2320 |
| # (otherwise we can hang when we kill DumpRenderTree when we are running |
| # multiple threads). See http://bugs.python.org/issue2320 . |
| # Note that close_fds isn't supported on Windows, but this bug only |
| # shows up on Mac and Linux. |
| return sys.platform not in ('win32', 'cygwin') |
| |
| def _run_command_with_teed_output(self, args, teed_output): |
| args = map(unicode, args) # Popen will throw an exception if args are non-strings (like int()) |
| args = map(self._encode_argument_if_needed, args) |
| |
| child_process = subprocess.Popen(args, |
| stdout=subprocess.PIPE, |
| stderr=subprocess.STDOUT, |
| close_fds=self._should_close_fds()) |
| |
| # Use our own custom wait loop because Popen ignores a tee'd |
| # stderr/stdout. |
| # FIXME: This could be improved not to flatten output to stdout. |
| while True: |
| output_line = child_process.stdout.readline() |
| if output_line == "" and child_process.poll() != None: |
| # poll() is not threadsafe and can throw OSError due to: |
| # http://bugs.python.org/issue1731717 |
| return child_process.poll() |
| # We assume that the child process wrote to us in utf-8, |
| # so no re-encoding is necessary before writing here. |
| teed_output.write(output_line) |
| |
| # FIXME: Remove this deprecated method and move callers to run_command. |
| # FIXME: This method is a hack to allow running command which both |
| # capture their output and print out to stdin. Useful for things |
| # like "build-webkit" where we want to display to the user that we're building |
| # but still have the output to stuff into a log file. |
| def run_and_throw_if_fail(self, args, quiet=False, decode_output=True): |
| # Cache the child's output locally so it can be used for error reports. |
| child_out_file = StringIO.StringIO() |
| tee_stdout = sys.stdout |
| if quiet: |
| dev_null = open(os.devnull, "w") # FIXME: Does this need an encoding? |
| tee_stdout = dev_null |
| child_stdout = tee(child_out_file, tee_stdout) |
| exit_code = self._run_command_with_teed_output(args, child_stdout) |
| if quiet: |
| dev_null.close() |
| |
| child_output = child_out_file.getvalue() |
| child_out_file.close() |
| |
| if decode_output: |
| child_output = child_output.decode(self._child_process_encoding()) |
| |
| if exit_code: |
| raise ScriptError(script_args=args, |
| exit_code=exit_code, |
| output=child_output) |
| return child_output |
| |
| def cpu_count(self): |
| if multiprocessing: |
| return multiprocessing.cpu_count() |
| # Darn. We don't have the multiprocessing package. |
| system_name = platform.system() |
| if system_name == "Darwin": |
| return int(self.run_command(["sysctl", "-n", "hw.ncpu"])) |
| elif system_name == "Windows": |
| return int(os.environ.get('NUMBER_OF_PROCESSORS', 1)) |
| elif system_name == "Linux": |
| num_cores = os.sysconf("SC_NPROCESSORS_ONLN") |
| if isinstance(num_cores, int) and num_cores > 0: |
| return num_cores |
| # This quantity is a lie but probably a reasonable guess for modern |
| # machines. |
| return 2 |
| |
| @staticmethod |
| def interpreter_for_script(script_path, fs=FileSystem()): |
| lines = fs.read_text_file(script_path).splitlines() |
| if not len(lines): |
| return None |
| first_line = lines[0] |
| if not first_line.startswith('#!'): |
| return None |
| if first_line.find('python') > -1: |
| return sys.executable |
| if first_line.find('perl') > -1: |
| return 'perl' |
| if first_line.find('ruby') > -1: |
| return 'ruby' |
| return None |
| |
| def kill_process(self, pid): |
| """Attempts to kill the given pid. |
| Will fail silently if pid does not exist or insufficient permisssions.""" |
| if sys.platform == "win32": |
| # We only use taskkill.exe on windows (not cygwin) because subprocess.pid |
| # is a CYGWIN pid and taskkill.exe expects a windows pid. |
| # Thankfully os.kill on CYGWIN handles either pid type. |
| command = ["taskkill.exe", "/f", "/pid", pid] |
| # taskkill will exit 128 if the process is not found. We should log. |
| self.run_command(command, error_handler=self.ignore_error) |
| return |
| |
| # According to http://docs.python.org/library/os.html |
| # os.kill isn't available on Windows. python 2.5.5 os.kill appears |
| # to work in cygwin, however it occasionally raises EAGAIN. |
| retries_left = 10 if sys.platform == "cygwin" else 1 |
| while retries_left > 0: |
| try: |
| retries_left -= 1 |
| os.kill(pid, signal.SIGKILL) |
| except OSError, e: |
| if e.errno == errno.EAGAIN: |
| if retries_left <= 0: |
| _log.warn("Failed to kill pid %s. Too many EAGAIN errors." % pid) |
| continue |
| if e.errno == errno.ESRCH: # The process does not exist. |
| _log.warn("Called kill_process with a non-existant pid %s" % pid) |
| return |
| raise |
| |
| def _win32_check_running_pid(self, pid): |
| |
| class PROCESSENTRY32(ctypes.Structure): |
| _fields_ = [("dwSize", ctypes.c_ulong), |
| ("cntUsage", ctypes.c_ulong), |
| ("th32ProcessID", ctypes.c_ulong), |
| ("th32DefaultHeapID", ctypes.c_ulong), |
| ("th32ModuleID", ctypes.c_ulong), |
| ("cntThreads", ctypes.c_ulong), |
| ("th32ParentProcessID", ctypes.c_ulong), |
| ("pcPriClassBase", ctypes.c_ulong), |
| ("dwFlags", ctypes.c_ulong), |
| ("szExeFile", ctypes.c_char * 260)] |
| |
| CreateToolhelp32Snapshot = ctypes.windll.kernel32.CreateToolhelp32Snapshot |
| Process32First = ctypes.windll.kernel32.Process32First |
| Process32Next = ctypes.windll.kernel32.Process32Next |
| CloseHandle = ctypes.windll.kernel32.CloseHandle |
| TH32CS_SNAPPROCESS = 0x00000002 # win32 magic number |
| hProcessSnap = CreateToolhelp32Snapshot(TH32CS_SNAPPROCESS, 0) |
| pe32 = PROCESSENTRY32() |
| pe32.dwSize = ctypes.sizeof(PROCESSENTRY32) |
| result = False |
| if not Process32First(hProcessSnap, ctypes.byref(pe32)): |
| _log.debug("Failed getting first process.") |
| CloseHandle(hProcessSnap) |
| return result |
| while True: |
| if pe32.th32ProcessID == pid: |
| result = True |
| break |
| if not Process32Next(hProcessSnap, ctypes.byref(pe32)): |
| break |
| CloseHandle(hProcessSnap) |
| return result |
| |
| def check_running_pid(self, pid): |
| """Return True if pid is alive, otherwise return False.""" |
| if sys.platform in ('darwin', 'linux2', 'cygwin'): |
| try: |
| os.kill(pid, 0) |
| return True |
| except OSError: |
| return False |
| elif sys.platform == 'win32': |
| return self._win32_check_running_pid(pid) |
| |
| assert(False) |
| |
| def _windows_image_name(self, process_name): |
| name, extension = os.path.splitext(process_name) |
| if not extension: |
| # taskkill expects processes to end in .exe |
| # If necessary we could add a flag to disable appending .exe. |
| process_name = "%s.exe" % name |
| return process_name |
| |
| def kill_all(self, process_name): |
| """Attempts to kill processes matching process_name. |
| Will fail silently if no process are found.""" |
| if sys.platform in ("win32", "cygwin"): |
| image_name = self._windows_image_name(process_name) |
| command = ["taskkill.exe", "/f", "/im", image_name] |
| # taskkill will exit 128 if the process is not found. We should log. |
| self.run_command(command, error_handler=self.ignore_error) |
| return |
| |
| # FIXME: This is inconsistent that kill_all uses TERM and kill_process |
| # uses KILL. Windows is always using /f (which seems like -KILL). |
| # We should pick one mode, or add support for switching between them. |
| # Note: Mac OS X 10.6 requires -SIGNALNAME before -u USER |
| command = ["killall", "-TERM", "-u", os.getenv("USER"), process_name] |
| # killall returns 1 if no process can be found and 2 on command error. |
| # FIXME: We should pass a custom error_handler to allow only exit_code 1. |
| # We should log in exit_code == 1 |
| self.run_command(command, error_handler=self.ignore_error) |
| |
| # Error handlers do not need to be static methods once all callers are |
| # updated to use an Executive object. |
| |
| @staticmethod |
| def default_error_handler(error): |
| raise error |
| |
| @staticmethod |
| def ignore_error(error): |
| pass |
| |
| def _compute_stdin(self, input): |
| """Returns (stdin, string_to_communicate)""" |
| # FIXME: We should be returning /dev/null for stdin |
| # or closing stdin after process creation to prevent |
| # child processes from getting input from the user. |
| if not input: |
| return (None, None) |
| if hasattr(input, "read"): # Check if the input is a file. |
| return (input, None) # Assume the file is in the right encoding. |
| |
| # Popen in Python 2.5 and before does not automatically encode unicode objects. |
| # http://bugs.python.org/issue5290 |
| # See https://bugs.webkit.org/show_bug.cgi?id=37528 |
| # for an example of a regresion caused by passing a unicode string directly. |
| # FIXME: We may need to encode differently on different platforms. |
| if isinstance(input, unicode): |
| input = input.encode(self._child_process_encoding()) |
| return (subprocess.PIPE, input) |
| |
| def _command_for_printing(self, args): |
| """Returns a print-ready string representing command args. |
| The string should be copy/paste ready for execution in a shell.""" |
| escaped_args = [] |
| for arg in args: |
| if isinstance(arg, unicode): |
| # Escape any non-ascii characters for easy copy/paste |
| arg = arg.encode("unicode_escape") |
| # FIXME: Do we need to fix quotes here? |
| escaped_args.append(arg) |
| return " ".join(escaped_args) |
| |
| # FIXME: run_and_throw_if_fail should be merged into this method. |
| def run_command(self, |
| args, |
| cwd=None, |
| input=None, |
| error_handler=None, |
| return_exit_code=False, |
| return_stderr=True, |
| decode_output=True): |
| """Popen wrapper for convenience and to work around python bugs.""" |
| assert(isinstance(args, list) or isinstance(args, tuple)) |
| start_time = time.time() |
| args = map(unicode, args) # Popen will throw an exception if args are non-strings (like int()) |
| args = map(self._encode_argument_if_needed, args) |
| |
| stdin, string_to_communicate = self._compute_stdin(input) |
| stderr = subprocess.STDOUT if return_stderr else None |
| |
| process = subprocess.Popen(args, |
| stdin=stdin, |
| stdout=subprocess.PIPE, |
| stderr=stderr, |
| cwd=cwd, |
| close_fds=self._should_close_fds()) |
| output = process.communicate(string_to_communicate)[0] |
| |
| # run_command automatically decodes to unicode() unless explicitly told not to. |
| if decode_output: |
| output = output.decode(self._child_process_encoding()) |
| |
| # wait() is not threadsafe and can throw OSError due to: |
| # http://bugs.python.org/issue1731717 |
| exit_code = process.wait() |
| |
| _log.debug('"%s" took %.2fs' % (self._command_for_printing(args), time.time() - start_time)) |
| |
| if return_exit_code: |
| return exit_code |
| |
| if exit_code: |
| script_error = ScriptError(script_args=args, |
| exit_code=exit_code, |
| output=output, |
| cwd=cwd) |
| (error_handler or self.default_error_handler)(script_error) |
| return output |
| |
| def _child_process_encoding(self): |
| # Win32 Python 2.x uses CreateProcessA rather than CreateProcessW |
| # to launch subprocesses, so we have to encode arguments using the |
| # current code page. |
| if sys.platform == 'win32' and versioning.compare_version(sys, '3.0')[0] < 0: |
| return 'mbcs' |
| # All other platforms use UTF-8. |
| # FIXME: Using UTF-8 on Cygwin will confuse Windows-native commands |
| # which will expect arguments to be encoded using the current code |
| # page. |
| return 'utf-8' |
| |
| def _should_encode_child_process_arguments(self): |
| # Cygwin's Python's os.execv doesn't support unicode command |
| # arguments, and neither does Cygwin's execv itself. |
| if sys.platform == 'cygwin': |
| return True |
| |
| # Win32 Python 2.x uses CreateProcessA rather than CreateProcessW |
| # to launch subprocesses, so we have to encode arguments using the |
| # current code page. |
| if sys.platform == 'win32' and versioning.compare_version(sys, '3.0')[0] < 0: |
| return True |
| |
| return False |
| |
| def _encode_argument_if_needed(self, argument): |
| if not self._should_encode_child_process_arguments(): |
| return argument |
| return argument.encode(self._child_process_encoding()) |
