Add small util for killing hanging processes.

tools/task_kill.py

+#!/usr/bin/env python
+#
+# Copyright (c) 2013, the Dart project authors.  Please see the AUTHORS file
+# for details. All rights reserved. Use of this source code is governed by a
+# BSD-style license that can be found in the LICENSE file.
+#
+
+# A script to kill hanging processs. The tool will return non-zero if any
+# process was actually found.
+#
+
+import optparse
+import os
+import signal
+import shutil
+import string
+import subprocess
+import sys
+import utils
+
+os_name = utils.GuessOS()
+
+POSIX_INFO = 'ps -p %s -o args'
+
+EXECUTABLE_NAMES = {
+  'win32': { 'chrome': 'chrome.exe', 'dart': 'dart.exe',
+             'iexplore': 'iexplore.exe', 'firefox': 'firefox.exe'},
+  'linux': { 'chrome': 'chrome', 'dart': 'dart',
+             'firefox': 'firefox.exe'},
+  'macos': { 'chrome': 'Chrome', 'dart': 'dart',
+             'firefox': 'firefox', 'safari': 'Safari' }
+}
+
+INFO_COMMAND = {
+  'win32': 'wmic process where Processid=%s get CommandLine',

[kustermann, 2013/08/27 12:33:14]

Don't you need to quote this 'where Processid='?

+  'macos': POSIX_INFO,
+  'linux': POSIX_INFO,
+}
+
+def GetOptions():
+  parser = optparse.OptionParser("usage: %prog [options]")
+  parser.add_option("--kill_dart", default=True,
+                    help="Kill all dart processes")
+  parser.add_option("--kill_browsers", default=False,
+                     help="Kill all browser processes")
+  (options, args) = parser.parse_args()
+  return options
+
+
+def GetPidsPosix(process_name):
+  # This is to have only one posix command, on linux we could just do:
+  # pidof process_name
+  cmd = 'ps -e -o pid=,comm='
+  # Sample output:
+  # 1 /sbin/launchd
+  # 80943 /Applications/Safari.app/Contents/MacOS/Safari
+  p = subprocess.Popen(cmd,
+                       stdout=subprocess.PIPE,
+                       stderr=subprocess.PIPE,
+                       shell=True)
+  output, stderr = p.communicate()
+  results = []
+  lines = output.splitlines()
+  for line in lines:
+    split = line.split()
+    # On mac this ps commands actually gives us the full path to non
+    # system binaries.
+    if len(split) >= 2 and " ".join(split[1:]).endswith(process_name):
+      results.append(split[0])
+  return results
+
+
+def GetPidsWindows(process_name):
+  cmd = 'tasklist /FI "IMAGENAME eq %s" /NH' % process_name
+  # Sample output:
+  # dart.exe    4356 Console            1      6,800 K
+  p = subprocess.Popen(cmd,
+                       stdout=subprocess.PIPE,
+                       stderr=subprocess.PIPE,
+                       shell=True)
+  output, stderr = p.communicate()
+  results = []
+  lines = output.splitlines()
+
+  for line in lines:
+    split = line.split()
+    if len(split) > 2 and split[0] == process_name:
+      results.append(split[1])
+  return results
+
+def GetPids(process_name):
+  if (os_name == "win32"):
+    return GetPidsWindows(process_name)
+  else:
+    return GetPidsPosix(process_name)
+
+def PrintPidInfo(pid):
+  # We asume that the list command will return lines in the format:
+  # EXECUTABLE_PATH ARGS
+  # There may be blank strings in the output
+  p = subprocess.Popen(INFO_COMMAND[os_name] % pid,
+                       stdout=subprocess.PIPE,
+                       stderr=subprocess.PIPE,
+                       shell=True)
+  output, stderr = p.communicate()
+  lines = output.splitlines()
+
+  # Pop the header
+  lines.pop(0)
+  for line in lines:
+    # wmic will output a bunch of empty strings, we ignore these
+    if len(line) >= 1:
+      print("Hanging process info:")
+      print("  PID: %s" % pid)
+      print("  Command line: %s" % line)
+
+
+def KillPosix(pid):
+  try:
+    os.kill(int(pid), signal.SIGKILL);
+  except:
+    # Ignore this, the process is already dead from killing another process.
+    pass
+
+def KillWindows(pid):
+  # os.kill is not available until python 2.7
+  cmd = "taskkill /F /PID %s" % pid
+  p = subprocess.Popen(cmd,
+                       stdout=subprocess.PIPE,
+                       stderr=subprocess.PIPE,
+                       shell=True)

[kustermann, 2013/08/27 12:33:14]

if you do this, you have to do
p.communicate()

+
+def Kill(name):
+  if (name not in EXECUTABLE_NAMES[os_name]):
+    return 0
+  print("***************** Killing %s *****************" % name)
+  platform_name = EXECUTABLE_NAMES[os_name][name]
+  pids = GetPids(platform_name)
+  for pid in pids:
+    PrintPidInfo(pid);
+    if (os_name == "win32"):
+      KillWindows(pid)
+    else:
+      KillPosix(pid)
+    print("Killed pid: %s" % pid)
+  if (len(pids) == 0):
+    print("  Nothing to kill")

[kustermann, 2013/08/27 12:33:14]

"Nothing to kill" -> "No %s processes found." % name

+  return len(pids)
+
+def KillBrowsers():
+  status = Kill('firefox')
+  status += Kill('chrome')
+  status += Kill('iexplore')
+  status += Kill('safari')
+  return status
+
+def KillDart():
+  status = Kill("dart")
+  return status
+
+def Main():
+  options = GetOptions()
+  status = 0
+  if (options.kill_dart):
+    status += KillDart();
+  if (options.kill_browsers):
+    status = status + KillBrowsers()

[kustermann, 2013/08/27 12:33:14]

+= instead

+  return status
+
+if __name__ == '__main__':
+  sys.exit(Main())