Move out of the oslo namespace package

Move the public API out of oslo.concurrency to oslo_concurrency. Retain
the ability to import from the old namespace package for backwards
compatibility for this release cycle.

bp/drop-namespace-packages

Change-Id: I20d1647b1c3ef8cab3b69eccfe168eeb01703b72

.gitignore

@@ -41,6 +41,7 @@ output/*/index.html
 
 # Sphinx
 doc/build
+doc/source/api
 
 # pbr generates these
 AUTHORS

.testr.conf

@@ -2,6 +2,6 @@
 test_command=OS_STDOUT_CAPTURE=${OS_STDOUT_CAPTURE:-1} \
              OS_STDERR_CAPTURE=${OS_STDERR_CAPTURE:-1} \
              OS_TEST_TIMEOUT=${OS_TEST_TIMEOUT:-60} \
-             ${PYTHON:-python} -m subunit.run discover -t ./ ./tests $LISTOPT $IDOPTION
+             ${PYTHON:-python} -m subunit.run discover -t ./ . $LISTOPT $IDOPTION
 test_id_option=--load-list $IDFILE
 test_list_option=--list

doc/source/conf.py

@@ -36,8 +36,9 @@ extensions = [
 # files.
 exclude_patterns = [
     'api/tests.*',  # avoid of docs generation from tests
-    'api/oslo.concurrency.openstack.common.*',  # skip common modules
-    'api/oslo.concurrency._*',  # skip private modules
+    'api/oslo.concurrency.*',  # skip deprecated import from namespace package
+    'api/oslo_concurrency.openstack.common.*',  # skip common modules
+    'api/oslo_concurrency._*',  # skip private modules
 ]
 
 # Prune the excluded patterns from the autoindex

oslo/concurrency/__init__.py

@@ -0,0 +1,29 @@
+#    Licensed under the Apache License, Version 2.0 (the "License"); you may
+#    not use this file except in compliance with the License. You may obtain
+#    a copy of the License at
+#
+#         http://www.apache.org/licenses/LICENSE-2.0
+#
+#    Unless required by applicable law or agreed to in writing, software
+#    distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
+#    WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
+#    License for the specific language governing permissions and limitations
+#    under the License.
+
+import warnings
+
+from oslo_concurrency import lockutils  # noqa
+from oslo_concurrency import processutils  # noqa
+
+
+def deprecated():
+    new_name = __name__.replace('.', '_')
+    warnings.warn(
+        ('The oslo namespace package is deprecated. Please use %s instead.' %
+         new_name),
+        DeprecationWarning,
+        stacklevel=1,
+    )
+
+
+deprecated()

oslo/concurrency/fixture/__init__.py

@@ -0,0 +1,13 @@
+#    Licensed under the Apache License, Version 2.0 (the "License"); you may
+#    not use this file except in compliance with the License. You may obtain
+#    a copy of the License at
+#
+#         http://www.apache.org/licenses/LICENSE-2.0
+#
+#    Unless required by applicable law or agreed to in writing, software
+#    distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
+#    WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
+#    License for the specific language governing permissions and limitations
+#    under the License.
+
+from oslo_concurrency.fixture import lockutils  # noqa

oslo_concurrency/_i18n.py

@@ -16,7 +16,7 @@
 
 from oslo import i18n
 
-_translators = i18n.TranslatorFactory(domain='oslo.concurrency')
+_translators = i18n.TranslatorFactory(domain='oslo_concurrency')
 
 # The primary translation function using the well-known name "_"
 _ = _translators.primary

oslo_concurrency/fixture/lockutils.py

@@ -15,7 +15,7 @@
 
 import fixtures
 
-from oslo.concurrency import lockutils
+from oslo_concurrency import lockutils
 
 
 class LockFixture(fixtures.Fixture):

oslo_concurrency/lockutils.py

@@ -30,8 +30,8 @@ from oslo.config import cfg
 from oslo.config import cfgfilter
 import six
 
-from oslo.concurrency._i18n import _, _LE, _LI
-from oslo.concurrency.openstack.common import fileutils
+from oslo_concurrency._i18n import _, _LE, _LI
+from oslo_concurrency.openstack.common import fileutils
 
 
 LOG = logging.getLogger(__name__)

oslo_concurrency/opts.py

@@ -20,7 +20,7 @@ __all__ = [
 
 import copy
 
-from oslo.concurrency import lockutils
+from oslo_concurrency import lockutils
 
 
 def list_opts():
@@ -34,7 +34,7 @@ def list_opts():
     registered. A group name of None corresponds to the [DEFAULT] group in
     config files.
 
-    This function is also discoverable via the 'oslo.concurrency' entry point
+    This function is also discoverable via the 'oslo_concurrency' entry point
     under the 'oslo.config.opts' namespace.
 
     The purpose of this is to allow tools like the Oslo sample config file

oslo_concurrency/processutils.py

@@ -29,7 +29,7 @@ from oslo.utils import importutils
 from oslo.utils import strutils
 import six
 
-from oslo.concurrency._i18n import _
+from oslo_concurrency._i18n import _
 
 
 # NOTE(bnemec): eventlet doesn't monkey patch subprocess, so we need to

oslo_concurrency/tests/unit/test_lockutils.py

@@ -28,9 +28,9 @@ from oslo.config import cfg
 from oslotest import base as test_base
 import six
 
-from oslo.concurrency.fixture import lockutils as fixtures
-from oslo.concurrency import lockutils
 from oslo.config import fixture as config
+from oslo_concurrency.fixture import lockutils as fixtures
+from oslo_concurrency import lockutils
 
 
 class LockTestCase(test_base.BaseTestCase):
@@ -522,7 +522,7 @@ class LockutilsModuleTestCase(test_base.BaseTestCase):
         self.assertEqual(retval, 1)
 
     def test_direct_call_explodes(self):
-        cmd = [sys.executable, '-m', 'oslo.concurrency.lockutils']
+        cmd = [sys.executable, '-m', 'oslo_concurrency.lockutils']
         with open(os.devnull, 'w') as devnull:
             retval = subprocess.call(cmd, stderr=devnull)
             # 1 for Python 2.7 and 3.x, 255 for 2.6

oslo_concurrency/tests/unit/test_lockutils_eventlet.py

@@ -20,7 +20,7 @@ import eventlet
 from eventlet import greenpool
 from oslotest import base as test_base
 
-from oslo.concurrency import lockutils
+from oslo_concurrency import lockutils
 
 
 class TestFileLocks(test_base.BaseTestCase):

oslo_concurrency/tests/unit/test_processutils.py

@@ -27,7 +27,7 @@ import mock
 from oslotest import base as test_base
 import six
 
-from oslo.concurrency import processutils
+from oslo_concurrency import processutils
 from oslotest import mockpatch
 PROCESS_EXECUTION_ERROR_LOGGING_TEST = """#!/bin/bash
 exit 41"""
@@ -396,14 +396,14 @@ def fake_execute_raises(*cmd, **kwargs):
 class TryCmdTestCase(test_base.BaseTestCase):
     def test_keep_warnings(self):
         self.useFixture(fixtures.MonkeyPatch(
-            'oslo.concurrency.processutils.execute', fake_execute))
+            'oslo_concurrency.processutils.execute', fake_execute))
         o, e = processutils.trycmd('this is a command'.split(' '))
         self.assertNotEqual('', o)
         self.assertNotEqual('', e)
 
     def test_keep_warnings_from_raise(self):
         self.useFixture(fixtures.MonkeyPatch(
-            'oslo.concurrency.processutils.execute', fake_execute_raises))
+            'oslo_concurrency.processutils.execute', fake_execute_raises))
         o, e = processutils.trycmd('this is a command'.split(' '),
                                    discard_warnings=True)
         self.assertIsNotNone(o)
@@ -411,7 +411,7 @@ class TryCmdTestCase(test_base.BaseTestCase):
 
     def test_discard_warnings(self):
         self.useFixture(fixtures.MonkeyPatch(
-            'oslo.concurrency.processutils.execute', fake_execute))
+            'oslo_concurrency.processutils.execute', fake_execute))
         o, e = processutils.trycmd('this is a command'.split(' '),
                                    discard_warnings=True)
         self.assertIsNotNone(o)

setup.cfg

@@ -22,15 +22,18 @@ classifier =
 [files]
 packages =
     oslo
-    oslo.concurrency
+	oslo.concurrency
+	oslo.concurrency.fixture
+    oslo_concurrency
+    oslo_concurrency.fixture
 namespace_packages =
     oslo
 
 [entry_points]
 oslo.config.opts =
-    oslo.concurrency = oslo.concurrency.opts:list_opts
+    oslo.concurrency = oslo_concurrency.opts:list_opts
 console_scripts =
-    lockutils-wrapper = oslo.concurrency.lockutils:main
+    lockutils-wrapper = oslo_concurrency.lockutils:main
 
 [build_sphinx]
 source-dir = doc/source

tests/test_lockutils.py

@@ -0,0 +1,551 @@
+#    Copyright 2011 Justin Santa Barbara
+#
+#    Licensed under the Apache License, Version 2.0 (the "License"); you may
+#    not use this file except in compliance with the License. You may obtain
+#    a copy of the License at
+#
+#         http://www.apache.org/licenses/LICENSE-2.0
+#
+#    Unless required by applicable law or agreed to in writing, software
+#    distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
+#    WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
+#    License for the specific language governing permissions and limitations
+#    under the License.
+
+import errno
+import fcntl
+import multiprocessing
+import os
+import shutil
+import signal
+import subprocess
+import sys
+import tempfile
+import threading
+import time
+
+from oslo.config import cfg
+from oslotest import base as test_base
+import six
+
+from oslo.concurrency.fixture import lockutils as fixtures  # noqa
+from oslo.concurrency import lockutils  # noqa
+from oslo.config import fixture as config
+
+
+class LockTestCase(test_base.BaseTestCase):
+
+    def setUp(self):
+        super(LockTestCase, self).setUp()
+        self.config = self.useFixture(config.Config(lockutils.CONF)).config
+
+    def test_synchronized_wrapped_function_metadata(self):
+        @lockutils.synchronized('whatever', 'test-')
+        def foo():
+            """Bar."""
+            pass
+
+        self.assertEqual(foo.__doc__, 'Bar.', "Wrapped function's docstring "
+                                              "got lost")
+        self.assertEqual(foo.__name__, 'foo', "Wrapped function's name "
+                                              "got mangled")
+
+    def test_lock_acquire_release_file_lock(self):
+        lock_dir = tempfile.mkdtemp()
+        lock_file = os.path.join(lock_dir, 'lock')
+        lock = lockutils._FcntlLock(lock_file)
+
+        def try_lock():
+            try:
+                my_lock = lockutils._FcntlLock(lock_file)
+                my_lock.lockfile = open(lock_file, 'w')
+                my_lock.trylock()
+                my_lock.unlock()
+                os._exit(1)
+            except IOError:
+                os._exit(0)
+
+        def attempt_acquire(count):
+            children = []
+            for i in range(count):
+                child = multiprocessing.Process(target=try_lock)
+                child.start()
+                children.append(child)
+            exit_codes = []
+            for child in children:
+                child.join()
+                exit_codes.append(child.exitcode)
+            return sum(exit_codes)
+
+        self.assertTrue(lock.acquire())
+        try:
+            acquired_children = attempt_acquire(10)
+            self.assertEqual(0, acquired_children)
+        finally:
+            lock.release()
+
+        try:
+            acquired_children = attempt_acquire(5)
+            self.assertNotEqual(0, acquired_children)
+        finally:
+            try:
+                shutil.rmtree(lock_dir)
+            except IOError:
+                pass
+
+    def test_lock_internally(self):
+        """We can lock across multiple threads."""
+        saved_sem_num = len(lockutils._semaphores)
+        seen_threads = list()
+
+        def f(_id):
+            with lockutils.lock('testlock2', 'test-', external=False):
+                for x in range(10):
+                    seen_threads.append(_id)
+
+        threads = []
+        for i in range(10):
+            thread = threading.Thread(target=f, args=(i,))
+            threads.append(thread)
+            thread.start()
+
+        for thread in threads:
+            thread.join()
+
+        self.assertEqual(len(seen_threads), 100)
+        # Looking at the seen threads, split it into chunks of 10, and verify
+        # that the last 9 match the first in each chunk.
+        for i in range(10):
+            for j in range(9):
+                self.assertEqual(seen_threads[i * 10],
+                                 seen_threads[i * 10 + 1 + j])
+
+        self.assertEqual(saved_sem_num, len(lockutils._semaphores),
+                         "Semaphore leak detected")
+
+    def test_nested_synchronized_external_works(self):
+        """We can nest external syncs."""
+        tempdir = tempfile.mkdtemp()
+        try:
+            self.config(lock_path=tempdir, group='oslo_concurrency')
+            sentinel = object()
+
+            @lockutils.synchronized('testlock1', 'test-', external=True)
+            def outer_lock():
+
+                @lockutils.synchronized('testlock2', 'test-', external=True)
+                def inner_lock():
+                    return sentinel
+                return inner_lock()
+
+            self.assertEqual(sentinel, outer_lock())
+
+        finally:
+            if os.path.exists(tempdir):
+                shutil.rmtree(tempdir)
+
+    def _do_test_lock_externally(self):
+        """We can lock across multiple processes."""
+
+        def lock_files(handles_dir):
+
+            with lockutils.lock('external', 'test-', external=True):
+                # Open some files we can use for locking
+                handles = []
+                for n in range(50):
+                    path = os.path.join(handles_dir, ('file-%s' % n))
+                    handles.append(open(path, 'w'))
+
+                # Loop over all the handles and try locking the file
+                # without blocking, keep a count of how many files we
+                # were able to lock and then unlock. If the lock fails
+                # we get an IOError and bail out with bad exit code
+                count = 0
+                for handle in handles:
+                    try:
+                        fcntl.flock(handle, fcntl.LOCK_EX | fcntl.LOCK_NB)
+                        count += 1
+                        fcntl.flock(handle, fcntl.LOCK_UN)
+                    except IOError:
+                        os._exit(2)
+                    finally:
+                        handle.close()
+
+                # Check if we were able to open all files
+                self.assertEqual(50, count)
+
+        handles_dir = tempfile.mkdtemp()
+        try:
+            children = []
+            for n in range(50):
+                pid = os.fork()
+                if pid:
+                    children.append(pid)
+                else:
+                    try:
+                        lock_files(handles_dir)
+                    finally:
+                        os._exit(0)
+
+            for child in children:
+                (pid, status) = os.waitpid(child, 0)
+                if pid:
+                    self.assertEqual(0, status)
+        finally:
+            if os.path.exists(handles_dir):
+                shutil.rmtree(handles_dir, ignore_errors=True)
+
+    def test_lock_externally(self):
+        lock_dir = tempfile.mkdtemp()
+        self.config(lock_path=lock_dir, group='oslo_concurrency')
+
+        try:
+            self._do_test_lock_externally()
+        finally:
+            if os.path.exists(lock_dir):
+                shutil.rmtree(lock_dir, ignore_errors=True)
+
+    def test_lock_externally_lock_dir_not_exist(self):
+        lock_dir = tempfile.mkdtemp()
+        os.rmdir(lock_dir)
+        self.config(lock_path=lock_dir, group='oslo_concurrency')
+
+        try:
+            self._do_test_lock_externally()
+        finally:
+            if os.path.exists(lock_dir):
+                shutil.rmtree(lock_dir, ignore_errors=True)
+
+    def test_synchronized_with_prefix(self):
+        lock_name = 'mylock'
+        lock_pfix = 'mypfix-'
+
+        foo = lockutils.synchronized_with_prefix(lock_pfix)
+
+        @foo(lock_name, external=True)
+        def bar(dirpath, pfix, name):
+            return True
+
+        lock_dir = tempfile.mkdtemp()
+        self.config(lock_path=lock_dir, group='oslo_concurrency')
+
+        self.assertTrue(bar(lock_dir, lock_pfix, lock_name))
+
+    def test_synchronized_without_prefix(self):
+        lock_dir = tempfile.mkdtemp()
+        self.config(lock_path=lock_dir, group='oslo_concurrency')
+
+        @lockutils.synchronized('lock', external=True)
+        def test_without_prefix():
+            # We can't check much
+            pass
+
+        try:
+            test_without_prefix()
+        finally:
+            if os.path.exists(lock_dir):
+                shutil.rmtree(lock_dir, ignore_errors=True)
+
+    def test_synchronized_prefix_without_hypen(self):
+        lock_dir = tempfile.mkdtemp()
+        self.config(lock_path=lock_dir, group='oslo_concurrency')
+
+        @lockutils.synchronized('lock', 'hypen', True)
+        def test_without_hypen():
+            # We can't check much
+            pass
+
+        try:
+            test_without_hypen()
+        finally:
+            if os.path.exists(lock_dir):
+                shutil.rmtree(lock_dir, ignore_errors=True)
+
+    def test_contextlock(self):
+        lock_dir = tempfile.mkdtemp()
+        self.config(lock_path=lock_dir, group='oslo_concurrency')
+
+        try:
+            # Note(flaper87): Lock is not external, which means
+            # a semaphore will be yielded
+            with lockutils.lock("test") as sem:
+                if six.PY2:
+                    self.assertTrue(isinstance(sem, threading._Semaphore))
+                else:
+                    self.assertTrue(isinstance(sem, threading.Semaphore))
+
+                # NOTE(flaper87): Lock is external so an InterProcessLock
+                # will be yielded.
+                with lockutils.lock("test2", external=True) as lock:
+                    self.assertTrue(lock.exists())
+
+                with lockutils.lock("test1",
+                                    external=True) as lock1:
+                    self.assertTrue(isinstance(lock1,
+                                               lockutils.InterProcessLock))
+        finally:
+            if os.path.exists(lock_dir):
+                shutil.rmtree(lock_dir, ignore_errors=True)
+
+    def test_contextlock_unlocks(self):
+        lock_dir = tempfile.mkdtemp()
+        self.config(lock_path=lock_dir, group='oslo_concurrency')
+
+        sem = None
+
+        try:
+            with lockutils.lock("test") as sem:
+                if six.PY2:
+                    self.assertTrue(isinstance(sem, threading._Semaphore))
+                else:
+                    self.assertTrue(isinstance(sem, threading.Semaphore))
+
+                with lockutils.lock("test2", external=True) as lock:
+                    self.assertTrue(lock.exists())
+
+                # NOTE(flaper87): Lock should be free
+                with lockutils.lock("test2", external=True) as lock:
+                    self.assertTrue(lock.exists())
+
+            # NOTE(flaper87): Lock should be free
+            # but semaphore should already exist.
+            with lockutils.lock("test") as sem2:
+                self.assertEqual(sem, sem2)
+        finally:
+            if os.path.exists(lock_dir):
+                shutil.rmtree(lock_dir, ignore_errors=True)
+
+    def _test_remove_lock_external_file(self, lock_dir, use_external=False):
+        lock_name = 'mylock'
+        lock_pfix = 'mypfix-remove-lock-test-'
+
+        if use_external:
+            lock_path = lock_dir
+        else:
+            lock_path = None
+
+        lockutils.remove_external_lock_file(lock_name, lock_pfix, lock_path)
+
+        for ent in os.listdir(lock_dir):
+            self.assertRaises(OSError, ent.startswith, lock_pfix)
+
+        if os.path.exists(lock_dir):
+            shutil.rmtree(lock_dir, ignore_errors=True)
+
+    def test_remove_lock_external_file(self):
+        lock_dir = tempfile.mkdtemp()
+        self.config(lock_path=lock_dir, group='oslo_concurrency')
+        self._test_remove_lock_external_file(lock_dir)
+
+    def test_remove_lock_external_file_lock_path(self):
+        lock_dir = tempfile.mkdtemp()
+        self._test_remove_lock_external_file(lock_dir,
+                                             use_external=True)
+
+    def test_no_slash_in_b64(self):
+        # base64(sha1(foobar)) has a slash in it
+        with lockutils.lock("foobar"):
+            pass
+
+    def test_deprecated_names(self):
+        paths = self.create_tempfiles([['fake.conf', '\n'.join([
+            '[DEFAULT]',
+            'lock_path=foo',
+            'disable_process_locking=True'])
+        ]])
+        conf = cfg.ConfigOpts()
+        conf(['--config-file', paths[0]])
+        conf.register_opts(lockutils._opts, 'oslo_concurrency')
+        self.assertEqual(conf.oslo_concurrency.lock_path, 'foo')
+        self.assertTrue(conf.oslo_concurrency.disable_process_locking)
+
+
+class BrokenLock(lockutils._FileLock):
+    def __init__(self, name, errno_code):
+        super(BrokenLock, self).__init__(name)
+        self.errno_code = errno_code
+
+    def unlock(self):
+        pass
+
+    def trylock(self):
+        err = IOError()
+        err.errno = self.errno_code
+        raise err
+
+
+class FileBasedLockingTestCase(test_base.BaseTestCase):
+    def setUp(self):
+        super(FileBasedLockingTestCase, self).setUp()
+        self.lock_dir = tempfile.mkdtemp()
+
+    def test_lock_file_exists(self):
+        lock_file = os.path.join(self.lock_dir, 'lock-file')
+
+        @lockutils.synchronized('lock-file', external=True,
+                                lock_path=self.lock_dir)
+        def foo():
+            self.assertTrue(os.path.exists(lock_file))
+
+        foo()
+
+    def test_bad_acquire(self):
+        lock_file = os.path.join(self.lock_dir, 'lock')
+        lock = BrokenLock(lock_file, errno.EBUSY)
+
+        self.assertRaises(threading.ThreadError, lock.acquire)
+
+    def test_interprocess_lock(self):
+        lock_file = os.path.join(self.lock_dir, 'processlock')
+
+        pid = os.fork()
+        if pid:
+            # Make sure the child grabs the lock first
+            start = time.time()
+            while not os.path.exists(lock_file):
+                if time.time() - start > 5:
+                    self.fail('Timed out waiting for child to grab lock')
+                time.sleep(0)
+            lock1 = lockutils.InterProcessLock('foo')
+            lock1.lockfile = open(lock_file, 'w')
+            # NOTE(bnemec): There is a brief window between when the lock file
+            # is created and when it actually becomes locked.  If we happen to
+            # context switch in that window we may succeed in locking the
+            # file.  Keep retrying until we either get the expected exception
+            # or timeout waiting.
+            while time.time() - start < 5:
+                try:
+                    lock1.trylock()
+                    lock1.unlock()
+                    time.sleep(0)
+                except IOError:
+                    # This is what we expect to happen
+                    break
+            else:
+                self.fail('Never caught expected lock exception')
+            # We don't need to wait for the full sleep in the child here
+            os.kill(pid, signal.SIGKILL)
+        else:
+            try:
+                lock2 = lockutils.InterProcessLock('foo')
+                lock2.lockfile = open(lock_file, 'w')
+                have_lock = False
+                while not have_lock:
+                    try:
+                        lock2.trylock()
+                        have_lock = True
+                    except IOError:
+                        pass
+            finally:
+                # NOTE(bnemec): This is racy, but I don't want to add any
+                # synchronization primitives that might mask a problem
+                # with the one we're trying to test here.
+                time.sleep(.5)
+                os._exit(0)
+
+    def test_interthread_external_lock(self):
+        call_list = []
+
+        @lockutils.synchronized('foo', external=True, lock_path=self.lock_dir)
+        def foo(param):
+            """Simulate a long-running threaded operation."""
+            call_list.append(param)
+            # NOTE(bnemec): This is racy, but I don't want to add any
+            # synchronization primitives that might mask a problem
+            # with the one we're trying to test here.
+            time.sleep(.5)
+            call_list.append(param)
+
+        def other(param):
+            foo(param)
+
+        thread = threading.Thread(target=other, args=('other',))
+        thread.start()
+        # Make sure the other thread grabs the lock
+        # NOTE(bnemec): File locks do not actually work between threads, so
+        # this test is verifying that the local semaphore is still enforcing
+        # external locks in that case.  This means this test does not have
+        # the same race problem as the process test above because when the
+        # file is created the semaphore has already been grabbed.
+        start = time.time()
+        while not os.path.exists(os.path.join(self.lock_dir, 'foo')):
+            if time.time() - start > 5:
+                self.fail('Timed out waiting for thread to grab lock')
+            time.sleep(0)
+        thread1 = threading.Thread(target=other, args=('main',))
+        thread1.start()
+        thread1.join()
+        thread.join()
+        self.assertEqual(call_list, ['other', 'other', 'main', 'main'])
+
+    def test_non_destructive(self):
+        lock_file = os.path.join(self.lock_dir, 'not-destroyed')
+        with open(lock_file, 'w') as f:
+            f.write('test')
+        with lockutils.lock('not-destroyed', external=True,
+                            lock_path=self.lock_dir):
+            with open(lock_file) as f:
+                self.assertEqual(f.read(), 'test')
+
+
+class LockutilsModuleTestCase(test_base.BaseTestCase):
+
+    def setUp(self):
+        super(LockutilsModuleTestCase, self).setUp()
+        self.old_env = os.environ.get('OSLO_LOCK_PATH')
+        if self.old_env is not None:
+            del os.environ['OSLO_LOCK_PATH']
+
+    def tearDown(self):
+        if self.old_env is not None:
+            os.environ['OSLO_LOCK_PATH'] = self.old_env
+        super(LockutilsModuleTestCase, self).tearDown()
+
+    def test_main(self):
+        script = '\n'.join([
+            'import os',
+            'lock_path = os.environ.get("OSLO_LOCK_PATH")',
+            'assert lock_path is not None',
+            'assert os.path.isdir(lock_path)',
+        ])
+        argv = ['', sys.executable, '-c', script]
+        retval = lockutils._lock_wrapper(argv)
+        self.assertEqual(retval, 0, "Bad OSLO_LOCK_PATH has been set")
+
+    def test_return_value_maintained(self):
+        script = '\n'.join([
+            'import sys',
+            'sys.exit(1)',
+        ])
+        argv = ['', sys.executable, '-c', script]
+        retval = lockutils._lock_wrapper(argv)
+        self.assertEqual(retval, 1)
+
+    def test_direct_call_explodes(self):
+        cmd = [sys.executable, '-m', 'oslo_concurrency.lockutils']
+        with open(os.devnull, 'w') as devnull:
+            retval = subprocess.call(cmd, stderr=devnull)
+            # 1 for Python 2.7 and 3.x, 255 for 2.6
+            self.assertIn(retval, [1, 255])
+
+
+class TestLockFixture(test_base.BaseTestCase):
+
+    def setUp(self):
+        super(TestLockFixture, self).setUp()
+        self.config = self.useFixture(config.Config(lockutils.CONF)).config
+        self.tempdir = tempfile.mkdtemp()
+
+    def _check_in_lock(self):
+        self.assertTrue(self.lock.exists())
+
+    def tearDown(self):
+        self._check_in_lock()
+        super(TestLockFixture, self).tearDown()
+
+    def test_lock_fixture(self):
+        # Setup lock fixture to test that teardown is inside the lock
+        self.config(lock_path=self.tempdir, group='oslo_concurrency')
+        fixture = fixtures.LockFixture('test-lock')
+        self.useFixture(fixture)
+        self.lock = fixture.lock

tests/test_processutils.py

@@ -0,0 +1,519 @@
+# Copyright 2011 OpenStack Foundation.
+# All Rights Reserved.
+#
+#    Licensed under the Apache License, Version 2.0 (the "License"); you may
+#    not use this file except in compliance with the License. You may obtain
+#    a copy of the License at
+#
+#         http://www.apache.org/licenses/LICENSE-2.0
+#
+#    Unless required by applicable law or agreed to in writing, software
+#    distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
+#    WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
+#    License for the specific language governing permissions and limitations
+#    under the License.
+
+from __future__ import print_function
+
+import errno
+import logging
+import multiprocessing
+import os
+import stat
+import tempfile
+
+import fixtures
+import mock
+from oslotest import base as test_base
+from oslotest import mockpatch
+import six
+
+from oslo.concurrency import processutils  # noqa
+
+PROCESS_EXECUTION_ERROR_LOGGING_TEST = """#!/bin/bash
+exit 41"""
+
+TEST_EXCEPTION_AND_MASKING_SCRIPT = """#!/bin/bash
+# This is to test stdout and stderr
+# and the command returned in an exception
+# when a non-zero exit code is returned
+echo onstdout --password='"secret"'
+echo onstderr --password='"secret"' 1>&2
+exit 38"""
+
+
+class UtilsTest(test_base.BaseTestCase):
+    # NOTE(jkoelker) Moar tests from nova need to be ported. But they
+    #                need to be mock'd out. Currently they require actually
+    #                running code.
+    def test_execute_unknown_kwargs(self):
+        self.assertRaises(processutils.UnknownArgumentError,
+                          processutils.execute,
+                          hozer=True)
+
+    @mock.patch.object(multiprocessing, 'cpu_count', return_value=8)
+    def test_get_worker_count(self, mock_cpu_count):
+        self.assertEqual(8, processutils.get_worker_count())
+
+    @mock.patch.object(multiprocessing, 'cpu_count',
+                       side_effect=NotImplementedError())
+    def test_get_worker_count_cpu_count_not_implemented(self,
+                                                        mock_cpu_count):
+        self.assertEqual(1, processutils.get_worker_count())
+
+
+class ProcessExecutionErrorTest(test_base.BaseTestCase):
+
+    def test_defaults(self):
+        err = processutils.ProcessExecutionError()
+        self.assertTrue('None\n' in six.text_type(err))
+        self.assertTrue('code: -\n' in six.text_type(err))
+
+    def test_with_description(self):
+        description = 'The Narwhal Bacons at Midnight'
+        err = processutils.ProcessExecutionError(description=description)
+        self.assertTrue(description in six.text_type(err))
+
+    def test_with_exit_code(self):
+        exit_code = 0
+        err = processutils.ProcessExecutionError(exit_code=exit_code)
+        self.assertTrue(str(exit_code) in six.text_type(err))
+
+    def test_with_cmd(self):
+        cmd = 'telinit'
+        err = processutils.ProcessExecutionError(cmd=cmd)
+        self.assertTrue(cmd in six.text_type(err))
+
+    def test_with_stdout(self):
+        stdout = """
+        Lo, praise of the prowess of people-kings
+        of spear-armed Danes, in days long sped,
+        we have heard, and what honot the athelings won!
+        Oft Scyld the Scefing from squadroned foes,
+        from many a tribe, the mead-bench tore,
+        awing the earls. Since erse he lay
+        friendless, a foundling, fate repaid him:
+        for he waxed under welkin, in wealth he trove,
+        till before him the folk, both far and near,
+        who house by the whale-path, heard his mandate,
+        gabe him gits: a good king he!
+        To him an heir was afterward born,
+        a son in his halls, whom heaven sent
+        to favor the fol, feeling their woe
+        that erst they had lacked an earl for leader
+        so long a while; the Lord endowed him,
+        the Wielder of Wonder, with world's renown.
+        """.strip()
+        err = processutils.ProcessExecutionError(stdout=stdout)
+        print(six.text_type(err))
+        self.assertTrue('people-kings' in six.text_type(err))
+
+    def test_with_stderr(self):
+        stderr = 'Cottonian library'
+        err = processutils.ProcessExecutionError(stderr=stderr)
+        self.assertTrue(stderr in six.text_type(err))
+
+    def test_retry_on_failure(self):
+        fd, tmpfilename = tempfile.mkstemp()
+        _, tmpfilename2 = tempfile.mkstemp()
+        try:
+            fp = os.fdopen(fd, 'w+')
+            fp.write('''#!/bin/sh
+# If stdin fails to get passed during one of the runs, make a note.
+if ! grep -q foo
+then
+    echo 'failure' > "$1"
+fi
+# If stdin has failed to get passed during this or a previous run, exit early.
+if grep failure "$1"
+then
+    exit 1
+fi
+runs="$(cat $1)"
+if [ -z "$runs" ]
+then
+    runs=0
+fi
+runs=$(($runs + 1))
+echo $runs > "$1"
+exit 1
+''')
+            fp.close()
+            os.chmod(tmpfilename, 0o755)
+            self.assertRaises(processutils.ProcessExecutionError,
+                              processutils.execute,
+                              tmpfilename, tmpfilename2, attempts=10,
+                              process_input=b'foo',
+                              delay_on_retry=False)
+            fp = open(tmpfilename2, 'r')
+            runs = fp.read()
+            fp.close()
+            self.assertNotEqual(runs.strip(), 'failure', 'stdin did not '
+                                                         'always get passed '
+                                                         'correctly')
+            runs = int(runs.strip())
+            self.assertEqual(runs, 10, 'Ran %d times instead of 10.' % (runs,))
+        finally:
+            os.unlink(tmpfilename)
+            os.unlink(tmpfilename2)
+
+    def test_unknown_kwargs_raises_error(self):
+        self.assertRaises(processutils.UnknownArgumentError,
+                          processutils.execute,
+                          '/usr/bin/env', 'true',
+                          this_is_not_a_valid_kwarg=True)
+
+    def test_check_exit_code_boolean(self):
+        processutils.execute('/usr/bin/env', 'false', check_exit_code=False)
+        self.assertRaises(processutils.ProcessExecutionError,
+                          processutils.execute,
+                          '/usr/bin/env', 'false', check_exit_code=True)
+
+    def test_check_exit_code_list(self):
+        processutils.execute('/usr/bin/env', 'sh', '-c', 'exit 101',
+                             check_exit_code=(101, 102))
+        processutils.execute('/usr/bin/env', 'sh', '-c', 'exit 102',
+                             check_exit_code=(101, 102))
+        self.assertRaises(processutils.ProcessExecutionError,
+                          processutils.execute,
+                          '/usr/bin/env', 'sh', '-c', 'exit 103',
+                          check_exit_code=(101, 102))
+        self.assertRaises(processutils.ProcessExecutionError,
+                          processutils.execute,
+                          '/usr/bin/env', 'sh', '-c', 'exit 0',
+                          check_exit_code=(101, 102))
+
+    def test_no_retry_on_success(self):
+        fd, tmpfilename = tempfile.mkstemp()
+        _, tmpfilename2 = tempfile.mkstemp()
+        try:
+            fp = os.fdopen(fd, 'w+')
+            fp.write("""#!/bin/sh
+# If we've already run, bail out.
+grep -q foo "$1" && exit 1
+# Mark that we've run before.
+echo foo > "$1"
+# Check that stdin gets passed correctly.
+grep foo
+""")
+            fp.close()
+            os.chmod(tmpfilename, 0o755)
+            processutils.execute(tmpfilename,
+                                 tmpfilename2,
+                                 process_input=b'foo',
+                                 attempts=2)
+        finally:
+            os.unlink(tmpfilename)
+            os.unlink(tmpfilename2)
+
+    # This test and the one below ensures that when communicate raises
+    # an OSError, we do the right thing(s)
+    def test_exception_on_communicate_error(self):
+        mock = self.useFixture(mockpatch.Patch(
+            'subprocess.Popen.communicate',
+            side_effect=OSError(errno.EAGAIN, 'fake-test')))
+
+        self.assertRaises(OSError,
+                          processutils.execute,
+                          '/usr/bin/env',
+                          'false',
+                          check_exit_code=False)
+
+        self.assertEqual(1, mock.mock.call_count)
+
+    def test_retry_on_communicate_error(self):
+        mock = self.useFixture(mockpatch.Patch(
+            'subprocess.Popen.communicate',
+            side_effect=OSError(errno.EAGAIN, 'fake-test')))
+
+        self.assertRaises(OSError,
+                          processutils.execute,
+                          '/usr/bin/env',
+                          'false',
+                          check_exit_code=False,
+                          attempts=5)
+
+        self.assertEqual(5, mock.mock.call_count)
+
+    def _test_and_check_logging_communicate_errors(self, log_errors=None,
+                                                   attempts=None):
+        mock = self.useFixture(mockpatch.Patch(
+            'subprocess.Popen.communicate',
+            side_effect=OSError(errno.EAGAIN, 'fake-test')))
+
+        fixture = self.useFixture(fixtures.FakeLogger(level=logging.DEBUG))
+        kwargs = {}
+
+        if log_errors:
+            kwargs.update({"log_errors": log_errors})
+
+        if attempts:
+            kwargs.update({"attempts": attempts})
+
+        self.assertRaises(OSError,
+                          processutils.execute,
+                          '/usr/bin/env',
+                          'false',
+                          **kwargs)
+
+        self.assertEqual(attempts if attempts else 1, mock.mock.call_count)
+        self.assertIn('Got an OSError', fixture.output)
+        self.assertIn('errno: 11', fixture.output)
+        self.assertIn("'/usr/bin/env false'", fixture.output)
+
+    def test_logging_on_communicate_error_1(self):
+        self._test_and_check_logging_communicate_errors(
+            log_errors=processutils.LOG_FINAL_ERROR,
+            attempts=None)
+
+    def test_logging_on_communicate_error_2(self):
+        self._test_and_check_logging_communicate_errors(
+            log_errors=processutils.LOG_FINAL_ERROR,
+            attempts=1)
+
+    def test_logging_on_communicate_error_3(self):
+        self._test_and_check_logging_communicate_errors(
+            log_errors=processutils.LOG_FINAL_ERROR,
+            attempts=5)
+
+    def test_logging_on_communicate_error_4(self):
+        self._test_and_check_logging_communicate_errors(
+            log_errors=processutils.LOG_ALL_ERRORS,
+            attempts=None)
+
+    def test_logging_on_communicate_error_5(self):
+        self._test_and_check_logging_communicate_errors(
+            log_errors=processutils.LOG_ALL_ERRORS,
+            attempts=1)
+
+    def test_logging_on_communicate_error_6(self):
+        self._test_and_check_logging_communicate_errors(
+            log_errors=processutils.LOG_ALL_ERRORS,
+            attempts=5)
+
+    def test_with_env_variables(self):
+        env_vars = {'SUPER_UNIQUE_VAR': 'The answer is 42'}
+
+        out, err = processutils.execute('/usr/bin/env', env_variables=env_vars)
+
+        self.assertIn(b'SUPER_UNIQUE_VAR=The answer is 42', out)
+
+    def test_exception_and_masking(self):
+        tmpfilename = self.create_tempfiles(
+            [["test_exceptions_and_masking",
+              TEST_EXCEPTION_AND_MASKING_SCRIPT]], ext='bash')[0]
+
+        os.chmod(tmpfilename, (stat.S_IRWXU |
+                               stat.S_IRGRP |
+                               stat.S_IXGRP |
+                               stat.S_IROTH |
+                               stat.S_IXOTH))
+
+        err = self.assertRaises(processutils.ProcessExecutionError,
+                                processutils.execute,
+                                tmpfilename, 'password="secret"',
+                                'something')
+
+        self.assertEqual(38, err.exit_code)
+        self.assertIn('onstdout --password="***"', err.stdout)
+        self.assertIn('onstderr --password="***"', err.stderr)
+        self.assertEqual(err.cmd, ' '.join([tmpfilename,
+                                            'password="***"',
+                                            'something']))
+        self.assertNotIn('secret', str(err))
+
+
+class ProcessExecutionErrorLoggingTest(test_base.BaseTestCase):
+    def setUp(self):
+        super(ProcessExecutionErrorLoggingTest, self).setUp()
+        self.tmpfilename = self.create_tempfiles(
+            [["process_execution_error_logging_test",
+              PROCESS_EXECUTION_ERROR_LOGGING_TEST]],
+            ext='bash')[0]
+
+        os.chmod(self.tmpfilename, (stat.S_IRWXU | stat.S_IRGRP |
+                                    stat.S_IXGRP | stat.S_IROTH |
+                                    stat.S_IXOTH))
+
+    def _test_and_check(self, log_errors=None, attempts=None):
+        fixture = self.useFixture(fixtures.FakeLogger(level=logging.DEBUG))
+        kwargs = {}
+
+        if log_errors:
+            kwargs.update({"log_errors": log_errors})
+
+        if attempts:
+            kwargs.update({"attempts": attempts})
+
+        err = self.assertRaises(processutils.ProcessExecutionError,
+                                processutils.execute,
+                                self.tmpfilename,
+                                **kwargs)
+
+        self.assertEqual(41, err.exit_code)
+        self.assertIn(self.tmpfilename, fixture.output)
+
+    def test_with_invalid_log_errors(self):
+        self.assertRaises(processutils.InvalidArgumentError,
+                          processutils.execute,
+                          self.tmpfilename,
+                          log_errors='invalid')
+
+    def test_with_log_errors_NONE(self):
+        self._test_and_check(log_errors=None, attempts=None)
+
+    def test_with_log_errors_final(self):
+        self._test_and_check(log_errors=processutils.LOG_FINAL_ERROR,
+                             attempts=None)
+
+    def test_with_log_errors_all(self):
+        self._test_and_check(log_errors=processutils.LOG_ALL_ERRORS,
+                             attempts=None)
+
+    def test_multiattempt_with_log_errors_NONE(self):
+        self._test_and_check(log_errors=None, attempts=3)
+
+    def test_multiattempt_with_log_errors_final(self):
+        self._test_and_check(log_errors=processutils.LOG_FINAL_ERROR,
+                             attempts=3)
+
+    def test_multiattempt_with_log_errors_all(self):
+        self._test_and_check(log_errors=processutils.LOG_ALL_ERRORS,
+                             attempts=3)
+
+
+def fake_execute(*cmd, **kwargs):
+    return 'stdout', 'stderr'
+
+
+def fake_execute_raises(*cmd, **kwargs):
+    raise processutils.ProcessExecutionError(exit_code=42,
+                                             stdout='stdout',
+                                             stderr='stderr',
+                                             cmd=['this', 'is', 'a',
+                                                  'command'])
+
+
+class TryCmdTestCase(test_base.BaseTestCase):
+    def test_keep_warnings(self):
+        self.useFixture(fixtures.MonkeyPatch(
+            'oslo_concurrency.processutils.execute', fake_execute))
+        o, e = processutils.trycmd('this is a command'.split(' '))
+        self.assertNotEqual('', o)
+        self.assertNotEqual('', e)
+
+    def test_keep_warnings_from_raise(self):
+        self.useFixture(fixtures.MonkeyPatch(
+            'oslo_concurrency.processutils.execute', fake_execute_raises))
+        o, e = processutils.trycmd('this is a command'.split(' '),
+                                   discard_warnings=True)
+        self.assertIsNotNone(o)
+        self.assertNotEqual('', e)
+
+    def test_discard_warnings(self):
+        self.useFixture(fixtures.MonkeyPatch(
+            'oslo_concurrency.processutils.execute', fake_execute))
+        o, e = processutils.trycmd('this is a command'.split(' '),
+                                   discard_warnings=True)
+        self.assertIsNotNone(o)
+        self.assertEqual('', e)
+
+
+class FakeSshChannel(object):
+    def __init__(self, rc):
+        self.rc = rc
+
+    def recv_exit_status(self):
+        return self.rc
+
+
+class FakeSshStream(six.StringIO):
+    def setup_channel(self, rc):
+        self.channel = FakeSshChannel(rc)
+
+
+class FakeSshConnection(object):
+    def __init__(self, rc):
+        self.rc = rc
+
+    def exec_command(self, cmd):
+        stdout = FakeSshStream('stdout')
+        stdout.setup_channel(self.rc)
+        return (six.StringIO(),
+                stdout,
+                six.StringIO('stderr'))
+
+
+class SshExecuteTestCase(test_base.BaseTestCase):
+    def test_invalid_addl_env(self):
+        self.assertRaises(processutils.InvalidArgumentError,
+                          processutils.ssh_execute,
+                          None, 'ls', addl_env='important')
+
+    def test_invalid_process_input(self):
+        self.assertRaises(processutils.InvalidArgumentError,
+                          processutils.ssh_execute,
+                          None, 'ls', process_input='important')
+
+    def test_works(self):
+        o, e = processutils.ssh_execute(FakeSshConnection(0), 'ls')
+        self.assertEqual('stdout', o)
+        self.assertEqual('stderr', e)
+
+    def test_fails(self):
+        self.assertRaises(processutils.ProcessExecutionError,
+                          processutils.ssh_execute, FakeSshConnection(1), 'ls')
+
+    def _test_compromising_ssh(self, rc, check):
+        fixture = self.useFixture(fixtures.FakeLogger(level=logging.DEBUG))
+        fake_stdin = six.StringIO()
+
+        fake_stdout = mock.Mock()
+        fake_stdout.channel.recv_exit_status.return_value = rc
+        fake_stdout.read.return_value = 'password="secret"'
+
+        fake_stderr = six.StringIO('password="foobar"')
+
+        command = 'ls --password="bar"'
+
+        connection = mock.Mock()
+        connection.exec_command.return_value = (fake_stdin, fake_stdout,
+                                                fake_stderr)
+
+        if check and rc != -1 and rc != 0:
+            err = self.assertRaises(processutils.ProcessExecutionError,
+                                    processutils.ssh_execute,
+                                    connection, command,
+                                    check_exit_code=check)
+
+            self.assertEqual(rc, err.exit_code)
+            self.assertEqual(err.stdout, 'password="***"')
+            self.assertEqual(err.stderr, 'password="***"')
+            self.assertEqual(err.cmd, 'ls --password="***"')
+            self.assertNotIn('secret', str(err))
+            self.assertNotIn('foobar', str(err))
+        else:
+            o, e = processutils.ssh_execute(connection, command,
+                                            check_exit_code=check)
+            self.assertEqual('password="***"', o)
+            self.assertEqual('password="***"', e)
+            self.assertIn('password="***"', fixture.output)
+            self.assertNotIn('bar', fixture.output)
+
+    def test_compromising_ssh1(self):
+        self._test_compromising_ssh(rc=-1, check=True)
+
+    def test_compromising_ssh2(self):
+        self._test_compromising_ssh(rc=0, check=True)
+
+    def test_compromising_ssh3(self):
+        self._test_compromising_ssh(rc=1, check=True)
+
+    def test_compromising_ssh4(self):
+        self._test_compromising_ssh(rc=1, check=False)
+
+    def test_compromising_ssh5(self):
+        self._test_compromising_ssh(rc=0, check=False)
+
+    def test_compromising_ssh6(self):
+        self._test_compromising_ssh(rc=-1, check=False)

tests/test_warning.py

@@ -0,0 +1,29 @@
+#    Licensed under the Apache License, Version 2.0 (the "License"); you may
+#    not use this file except in compliance with the License. You may obtain
+#    a copy of the License at
+#
+#         http://www.apache.org/licenses/LICENSE-2.0
+#
+#    Unless required by applicable law or agreed to in writing, software
+#    distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
+#    WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
+#    License for the specific language governing permissions and limitations
+#    under the License.
+
+import imp
+
+import mock
+from oslotest import base as test_base
+
+
+class DeprecationWarningTest(test_base.BaseTestCase):
+
+    @mock.patch('warnings.warn')
+    def test_warning(self, mock_warn):
+        import oslo.concurrency
+        imp.reload(oslo.concurrency)
+        self.assertTrue(mock_warn.called)
+        args = mock_warn.call_args
+        self.assertIn('oslo_concurrency', args[0][0])
+        self.assertIn('deprecated', args[0][0])
+        self.assertTrue(issubclass(args[0][1], DeprecationWarning))

tox.ini

@@ -1,6 +1,6 @@
 [tox]
 minversion = 1.6
-envlist = py26,py27,py33,py34,pypy,pep8
+envlist = py33,py34,py26,py27,pep8
 # NOTE(dhellmann): We cannot set skipdist=True
 # for oslo libraries because of the namespace package.
 #skipsdist = True
@@ -54,4 +54,4 @@ exclude=.venv,.git,.tox,dist,doc,*openstack/common*,*lib/python*,*egg,build
 
 [hacking]
 import_exceptions =
-  oslo.concurrency._i18n
+  oslo_concurrency._i18n