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import sys
import tempfile
import os
import zipfile
import datetime
import time
import subprocess
import pkg_resources
try:
unicode
except NameError:
unicode = str
def timestamp(dt):
"""
Return a timestamp for a local, naive datetime instance.
"""
try:
return dt.timestamp()
except AttributeError:
# Python 3.2 and earlier
return time.mktime(dt.timetuple())
class EggRemover(unicode):
def __call__(self):
if self in sys.path:
sys.path.remove(self)
if os.path.exists(self):
os.remove(self)
class TestZipProvider(object):
finalizers = []
ref_time = datetime.datetime(2013, 5, 12, 13, 25, 0)
"A reference time for a file modification"
@classmethod
def setup_class(cls):
"create a zip egg and add it to sys.path"
egg = tempfile.NamedTemporaryFile(suffix='.egg', delete=False)
zip_egg = zipfile.ZipFile(egg, 'w')
zip_info = zipfile.ZipInfo()
zip_info.filename = 'mod.py'
zip_info.date_time = cls.ref_time.timetuple()
zip_egg.writestr(zip_info, 'x = 3\n')
zip_info = zipfile.ZipInfo()
zip_info.filename = 'data.dat'
zip_info.date_time = cls.ref_time.timetuple()
zip_egg.writestr(zip_info, 'hello, world!')
zip_egg.close()
egg.close()
sys.path.append(egg.name)
cls.finalizers.append(EggRemover(egg.name))
@classmethod
def teardown_class(cls):
for finalizer in cls.finalizers:
finalizer()
def test_resource_filename_rewrites_on_change(self):
"""
If a previous call to get_resource_filename has saved the file, but
the file has been subsequently mutated with different file of the
same size and modification time, it should not be overwritten on a
subsequent call to get_resource_filename.
"""
import mod
manager = pkg_resources.ResourceManager()
zp = pkg_resources.ZipProvider(mod)
filename = zp.get_resource_filename(manager, 'data.dat')
actual = datetime.datetime.fromtimestamp(os.stat(filename).st_mtime)
assert actual == self.ref_time
f = open(filename, 'w')
f.write('hello, world?')
f.close()
ts = timestamp(self.ref_time)
os.utime(filename, (ts, ts))
filename = zp.get_resource_filename(manager, 'data.dat')
f = open(filename)
assert f.read() == 'hello, world!'
manager.cleanup_resources()
class TestResourceManager(object):
def test_get_cache_path(self):
mgr = pkg_resources.ResourceManager()
path = mgr.get_cache_path('foo')
type_ = str(type(path))
message = "Unexpected type from get_cache_path: " + type_
assert isinstance(path, (unicode, str)), message
class TestIndependence:
"""
Tests to ensure that pkg_resources runs independently from setuptools.
"""
def test_setuptools_not_imported(self):
"""
In a separate Python environment, import pkg_resources and assert
that action doesn't cause setuptools to be imported.
"""
lines = (
'import pkg_resources',
'import sys',
'assert "setuptools" not in sys.modules, '
'"setuptools was imported"',
)
cmd = [sys.executable, '-c', '; '.join(lines)]
subprocess.check_call(cmd)
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