blob: 46c09bf666934e83fa44d5aff7064af7812a59e6 [file] [log] [blame]
# Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
# See for license information.
# SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
from contextlib import contextmanager
import errno
import os
import platform
import signal
import subprocess
import sys
import tempfile
import threading
# FIXME: Most of these functions are cribbed from LIT
def to_bytes(str):
# Encode to UTF-8 to get binary data.
if isinstance(str, bytes):
return str
return str.encode('utf-8')
def to_string(bytes):
if isinstance(bytes, str):
return bytes
return to_bytes(bytes)
def convert_string(bytes):
return to_string(bytes.decode('utf-8'))
except AttributeError: # 'str' object has no attribute 'decode'.
return str(bytes)
except UnicodeError:
return str(bytes)
def cleanFile(filename):
except OSError:
def guardedTempFilename(suffix='', prefix='', dir=None):
# Creates and yeilds a temporary filename within a with statement. The file
# is removed upon scope exit.
handle, name = tempfile.mkstemp(suffix=suffix, prefix=prefix, dir=dir)
yield name
def guardedFilename(name):
# yeilds a filename within a with statement. The file is removed upon scope
# exit.
yield name
def nullContext(value):
# yeilds a variable within a with statement. No action is taken upon scope
# exit.
yield value
def makeReport(cmd, out, err, rc):
report = "Command: %s\n" % cmd
report += "Exit Code: %d\n" % rc
if out:
report += "Standard Output:\n--\n%s--\n" % out
if err:
report += "Standard Error:\n--\n%s--\n" % err
report += '\n'
return report
def capture(args, env=None):
"""capture(command) - Run the given command (or argv list) in a shell and
return the standard output. Raises a CalledProcessError if the command
exits with a non-zero status."""
p = subprocess.Popen(args, stdout=subprocess.PIPE, stderr=subprocess.PIPE,
out, err = p.communicate()
out = convert_string(out)
err = convert_string(err)
if p.returncode != 0:
raise subprocess.CalledProcessError(cmd=args,
output="{}\n{}".format(out, err))
return out
def which(command, paths = None):
"""which(command, [paths]) - Look up the given command in the paths string
(or the PATH environment variable, if unspecified)."""
if paths is None:
paths = os.environ.get('PATH','')
# Check for absolute match first.
if os.path.isfile(command):
return command
# Would be nice if Python had a lib function for this.
if not paths:
paths = os.defpath
# Get suffixes to search.
# On Cygwin, 'PATHEXT' may exist but it should not be used.
if os.pathsep == ';':
pathext = os.environ.get('PATHEXT', '').split(';')
pathext = ['']
# Search the paths...
for path in paths.split(os.pathsep):
for ext in pathext:
p = os.path.join(path, command + ext)
if os.path.exists(p) and not os.path.isdir(p):
return p
return None
def checkToolsPath(dir, tools):
for tool in tools:
if not os.path.exists(os.path.join(dir, tool)):
return False
return True
def whichTools(tools, paths):
for path in paths.split(os.pathsep):
if checkToolsPath(path, tools):
return path
return None
def mkdir_p(path):
"""mkdir_p(path) - Make the "path" directory, if it does not exist; this
will also make directories for any missing parent directories."""
if not path or os.path.exists(path):
parent = os.path.dirname(path)
if parent != path:
except OSError:
e = sys.exc_info()[1]
# Ignore EEXIST, which may occur during a race condition.
if e.errno != errno.EEXIST:
class ExecuteCommandTimeoutException(Exception):
def __init__(self, msg, out, err, exitCode):
assert isinstance(msg, str)
assert isinstance(out, str)
assert isinstance(err, str)
assert isinstance(exitCode, int)
self.msg = msg
self.out = out
self.err = err
self.exitCode = exitCode
# Close extra file handles on UNIX (on Windows this cannot be done while
# also redirecting input).
kUseCloseFDs = not (platform.system() == 'Windows')
def executeCommand(command, cwd=None, env=None, input=None, timeout=0):
Execute command ``command`` (list of arguments or string)
* working directory ``cwd`` (str), use None to use the current
working directory
* environment ``env`` (dict), use None for none
* Input to the command ``input`` (str), use string to pass
no input.
* Max execution time ``timeout`` (int) seconds. Use 0 for no timeout.
Returns a tuple (out, err, exitCode) where
* ``out`` (str) is the standard output of running the command
* ``err`` (str) is the standard error of running the command
* ``exitCode`` (int) is the exitCode of running the command
If the timeout is hit an ``ExecuteCommandTimeoutException``
is raised.
if input is not None:
input = to_bytes(input)
p = subprocess.Popen(command, cwd=cwd,
env=env, close_fds=kUseCloseFDs)
timerObject = None
# FIXME: Because of the way nested function scopes work in Python 2.x we
# need to use a reference to a mutable object rather than a plain
# bool. In Python 3 we could use the "nonlocal" keyword but we need
# to support Python 2 as well.
hitTimeOut = [False]
if timeout > 0:
def killProcess():
# We may be invoking a shell so we need to kill the
# process and all its children.
hitTimeOut[0] = True
timerObject = threading.Timer(timeout, killProcess)
out,err = p.communicate(input=input)
exitCode = p.wait()
if timerObject != None:
# Ensure the resulting output is always of string type.
out = convert_string(out)
err = convert_string(err)
if hitTimeOut[0]:
raise ExecuteCommandTimeoutException(
msg='Reached timeout of {} seconds'.format(timeout),
# Detect Ctrl-C in subprocess.
if exitCode == -signal.SIGINT:
raise KeyboardInterrupt
return out, err, exitCode
def killProcessAndChildren(pid):
This function kills a process with ``pid`` and all its
running children (recursively). It is currently implemented
using the psutil module which provides a simple platform
neutral implementation.
TODO: Reimplement this without using psutil so we can
remove our dependency on it.
import psutil
psutilProc = psutil.Process(pid)
# Handle the different psutil API versions
# psutil >= 2.x
children_iterator = psutilProc.children(recursive=True)
except AttributeError:
# psutil 1.x
children_iterator = psutilProc.get_children(recursive=True)
for child in children_iterator:
except psutil.NoSuchProcess:
except psutil.NoSuchProcess:
def executeCommandVerbose(cmd, *args, **kwargs):
Execute a command and print its output on failure.
out, err, exitCode = executeCommand(cmd, *args, **kwargs)
if exitCode != 0:
report = makeReport(cmd, out, err, exitCode)
report += "\n\nFailed!"
sys.stderr.write('%s\n' % report)
return out, err, exitCode