gem5/tests/testing/helpers.py
Andreas Sandberg c20b6c56f6 tests: Add regex-based ignore rules for ref files
There are cases where we need to ignore files with specific extensions
(e.g., when Mercurial litters the file system with patch
rejects). Implement this functionality using a helper class
(FileIgnoreList) that supports both regular expressions and basic
string comparisons.

Change-Id: I34549754bd2e10ed230ffb2dc057403349f8fa78
Signed-off-by: Andreas Sandberg <andreas.sandberg@arm.com>
2016-07-22 15:24:20 +01:00

190 lines
6.3 KiB
Python
Executable file

#!/usr/bin/env python
#
# Copyright (c) 2016 ARM Limited
# All rights reserved
#
# The license below extends only to copyright in the software and shall
# not be construed as granting a license to any other intellectual
# property including but not limited to intellectual property relating
# to a hardware implementation of the functionality of the software
# licensed hereunder. You may use the software subject to the license
# terms below provided that you ensure that this notice is replicated
# unmodified and in its entirety in all distributions of the software,
# modified or unmodified, in source code or in binary form.
#
# 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 the copyright holders 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.
#
# Authors: Andreas Sandberg
import subprocess
from threading import Timer
import time
import re
class CallTimeoutException(Exception):
"""Exception that indicates that a process call timed out"""
def __init__(self, status, stdout, stderr):
self.status = status
self.stdout = stdout
self.stderr = stderr
class ProcessHelper(subprocess.Popen):
"""Helper class to run child processes.
This class wraps a subprocess.Popen class and adds support for
using it in a with block. When the process goes out of scope, it's
automatically terminated.
with ProcessHelper(["/bin/ls"], stdout=subprocess.PIPE) as p:
return p.call()
"""
def __init__(self, *args, **kwargs):
super(ProcessHelper, self).__init__(*args, **kwargs)
def _terminate_nicely(self, timeout=5):
def on_timeout():
self.kill()
if self.returncode is not None:
return self.returncode
timer = Timer(timeout, on_timeout)
self.terminate()
status = self.wait()
timer.cancel()
return status
def __enter__(self):
return self
def __exit__(self, exc_type, exc_value, traceback):
if self.returncode is None:
self._terminate_nicely()
def call(self, timeout=0):
self._timeout = False
def on_timeout():
self._timeout = True
self._terminate_nicely()
status, stdout, stderr = None, None, None
timer = Timer(timeout, on_timeout)
if timeout:
timer.start()
stdout, stderr = self.communicate()
status = self.wait()
timer.cancel()
if self._timeout:
self._terminate_nicely()
raise CallTimeoutException(self.returncode, stdout, stderr)
else:
return status, stdout, stderr
class FileIgnoreList(object):
"""Helper class to implement file ignore lists.
This class implements ignore lists using plain string matching and
regular expressions. In the simplest use case, rules are created
statically upon initialization:
ignore_list = FileIgnoreList(name=("ignore_me.txt", ), rex=(r".*~", )
Ignores can be queried using in the same ways as normal Python
containers:
if file_name in ignore_list:
print "Ignoring %s" % file_name
New rules can be added at runtime by extending the list in the
rules attribute:
ignore_list.rules.append(FileIgnoreList.simple("bar.txt"))
"""
@staticmethod
def simple(r):
return lambda f: f == r
@staticmethod
def rex(r):
re_obj = r if hasattr(r, "search") else re.compile(r)
return lambda name: re_obj.search(name)
def __init__(self, names=(), rex=()):
self.rules = [ FileIgnoreList.simple(n) for n in names ] + \
[ FileIgnoreList.rex(r) for r in rex ]
def __contains__(self, name):
for rule in self.rules:
if rule(name):
return True
return False
if __name__ == "__main__":
# Run internal self tests to ensure that the helpers are working
# properly. The expected output when running this script is
# "SUCCESS!".
cmd_foo = [ "/bin/echo", "-n", "foo" ]
cmd_sleep = [ "/bin/sleep", "10" ]
# Test that things don't break if the process hasn't been started
with ProcessHelper(cmd_foo) as p:
pass
with ProcessHelper(cmd_foo, stdout=subprocess.PIPE) as p:
status, stdout, stderr = p.call()
assert stdout == "foo"
assert status == 0
try:
with ProcessHelper(cmd_sleep) as p:
status, stdout, stderr = p.call(timeout=1)
assert False, "Timeout not triggered"
except CallTimeoutException:
pass
ignore_list = FileIgnoreList(
names=("ignore.txt", "foo/test.txt"),
rex=(r"~$", re.compile("^#")))
assert "ignore.txt" in ignore_list
assert "bar.txt" not in ignore_list
assert "foo/test.txt" in ignore_list
assert "test.txt" not in ignore_list
assert "file1.c~" in ignore_list
assert "file1.c" not in ignore_list
assert "#foo" in ignore_list
assert "foo#" not in ignore_list
ignore_list.rules.append(FileIgnoreList.simple("bar.txt"))
assert "bar.txt" in ignore_list
print "SUCCESS!"