third_party/android_testrunner/run_command.py

   1 #!/usr/bin/python2.4
   2 #
   3 #
   4 # Copyright 2007, The Android Open Source Project
   5 #
   6 # Licensed under the Apache License, Version 2.0 (the "License");
   7 # you may not use this file except in compliance with the License.
   8 # You may obtain a copy of the License at
   9 #
  10 #     http://www.apache.org/licenses/LICENSE-2.0
  11 #
  12 # Unless required by applicable law or agreed to in writing, software
  13 # distributed under the License is distributed on an "AS IS" BASIS,
  14 # WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  15 # See the License for the specific language governing permissions and
  16 # limitations under the License.
  17
  18 # System imports
  19 import os
  20 import signal
  21 import subprocess
  22 import tempfile
  23 import threading
  24 import time
  25
  26 # local imports
  27 import errors
  28 import logger
  29
  30 _abort_on_error = False
  31
  32 def SetAbortOnError(abort=True):
  33   """Sets behavior of RunCommand to throw AbortError if command process returns
  34   a negative error code"""
  35   global _abort_on_error
  36   _abort_on_error = abort
  37
  38 def RunCommand(cmd, timeout_time=None, retry_count=3, return_output=True,
  39                stdin_input=None):
  40   """Spawn and retry a subprocess to run the given shell command.
  41
  42   Args:
  43     cmd: shell command to run
  44     timeout_time: time in seconds to wait for command to run before aborting.
  45     retry_count: number of times to retry command
  46     return_output: if True return output of command as string. Otherwise,
  47       direct output of command to stdout.
  48     stdin_input: data to feed to stdin
  49   Returns:
  50     output of command
  51   """
  52   result = None
  53   while True:
  54     try:
  55       result = RunOnce(cmd, timeout_time=timeout_time,
  56                        return_output=return_output, stdin_input=stdin_input)
  57     except errors.WaitForResponseTimedOutError:
  58       if retry_count == 0:
  59         raise
  60       retry_count -= 1
  61       logger.Log("No response for %s, retrying" % cmd)
  62     else:
  63       # Success
  64       return result
  65
  66 def RunOnce(cmd, timeout_time=None, return_output=True, stdin_input=None):
  67   """Spawns a subprocess to run the given shell command.
  68
  69   Args:
  70     cmd: shell command to run
  71     timeout_time: time in seconds to wait for command to run before aborting.
  72     return_output: if True return output of command as string. Otherwise,
  73       direct output of command to stdout.
  74     stdin_input: data to feed to stdin
  75   Returns:
  76     output of command
  77   Raises:
  78     errors.WaitForResponseTimedOutError if command did not complete within
  79       timeout_time seconds.
  80     errors.AbortError is command returned error code and SetAbortOnError is on.
  81   """
  82   start_time = time.time()
  83   so = []
  84   global _abort_on_error, error_occurred
  85   error_occurred = False
  86
  87   if return_output:
  88     output_dest = tempfile.TemporaryFile(bufsize=0)
  89   else:
  90     # None means direct to stdout
  91     output_dest = None
  92   if stdin_input:
  93     stdin_dest = subprocess.PIPE
  94   else:
  95     stdin_dest = None
  96   pipe = subprocess.Popen(
  97       cmd,
  98       executable='/bin/bash',
  99       stdin=stdin_dest,
 100       stdout=output_dest,
 101       stderr=subprocess.STDOUT,
 102       shell=True, close_fds=True,
 103       preexec_fn=lambda: signal.signal(signal.SIGPIPE, signal.SIG_DFL))
 104
 105   def Run():
 106     global error_occurred
 107     try:
 108       pipe.communicate(input=stdin_input)
 109       output = None
 110       if return_output:
 111         output_dest.seek(0)
 112         output = output_dest.read()
 113         output_dest.close()
 114       if output is not None and len(output) > 0:
 115         so.append(output)
 116     except OSError, e:
 117       logger.SilentLog("failed to retrieve stdout from: %s" % cmd)
 118       logger.Log(e)
 119       so.append("ERROR")
 120       error_occurred = True
 121     if pipe.returncode:
 122       logger.SilentLog("Error: %s returned %d error code" %(cmd,
 123           pipe.returncode))
 124       error_occurred = True
 125
 126   t = threading.Thread(target=Run)
 127   t.start()
 128   t.join(timeout_time)
 129   if t.isAlive():
 130     try:
 131       pipe.kill()
 132     except OSError:
 133       # Can't kill a dead process.
 134       pass
 135     finally:
 136       logger.SilentLog("about to raise a timeout for: %s" % cmd)
 137       raise errors.WaitForResponseTimedOutError
 138
 139   output = "".join(so)
 140   if _abort_on_error and error_occurred:
 141     raise errors.AbortError(msg=output)
 142
 143   return "".join(so)
 144
 145
 146 def RunHostCommand(binary, valgrind=False):
 147   """Run a command on the host (opt using valgrind).
 148
 149   Runs the host binary and returns the exit code.
 150   If successfull, the output (stdout and stderr) are discarded,
 151   but printed in case of error.
 152   The command can be run under valgrind in which case all the
 153   output are always discarded.
 154
 155   Args:
 156     binary: full path of the file to be run.
 157     valgrind: If True the command will be run under valgrind.
 158
 159   Returns:
 160     The command exit code (int)
 161   """
 162   if not valgrind:
 163     subproc = subprocess.Popen(binary, stdout=subprocess.PIPE,
 164                                stderr=subprocess.STDOUT)
 165     subproc.wait()
 166     if subproc.returncode != 0:         # In case of error print the output
 167       print subproc.communicate()[0]
 168     return subproc.returncode
 169   else:
 170     # Need the full path to valgrind to avoid other versions on the system.
 171     subproc = subprocess.Popen(["/usr/bin/valgrind", "--tool=memcheck",
 172                                 "--leak-check=yes", "-q", binary],
 173                                stdout=subprocess.PIPE, stderr=subprocess.STDOUT)
 174     # Cannot rely on the retcode of valgrind. Instead look for an empty output.
 175     valgrind_out = subproc.communicate()[0].strip()
 176     if valgrind_out:
 177       print valgrind_out
 178       return 1
 179     else:
 180       return 0
 181
 182
 183 def HasValgrind():
 184   """Check that /usr/bin/valgrind exists.
 185
 186   We look for the fullpath to avoid picking up 'alternative' valgrind
 187   on the system.
 188
 189   Returns:
 190     True if a system valgrind was found.
 191   """
 192   return os.path.exists("/usr/bin/valgrind")