[Python-checkins] r71875 - in python/trunk: Lib/test/test_support.py Misc/NEWS
walter.doerwald
python-checkins at python.org
Sat Apr 25 14:15:07 CEST 2009
Author: walter.doerwald
Date: Sat Apr 25 14:15:07 2009
New Revision: 71875
Log:
Issue #5837: Certain sequences of calls to set() and unset() for
support.EnvironmentVarGuard objects restored the environment variables
incorrectly on __exit__.
Fix this by recording the initial value of each environment variable on the
first access in set() or unset().
Modified:
python/trunk/Lib/test/test_support.py
python/trunk/Misc/NEWS
Modified: python/trunk/Lib/test/test_support.py
==============================================================================
--- python/trunk/Lib/test/test_support.py (original)
+++ python/trunk/Lib/test/test_support.py Sat Apr 25 14:15:07 2009
@@ -532,30 +532,32 @@
a context manager."""
def __init__(self):
- self._environ = os.environ
- self._unset = set()
- self._reset = dict()
+ self._changed = {}
def set(self, envvar, value):
- if envvar not in self._environ:
- self._unset.add(envvar)
- else:
- self._reset[envvar] = self._environ[envvar]
- self._environ[envvar] = value
+ # Remember the initial value on the first access
+ if envvar not in self._changed:
+ self._changed[envvar] = os.environ.get(envvar)
+ os.environ[envvar] = value
def unset(self, envvar):
- if envvar in self._environ:
- self._reset[envvar] = self._environ[envvar]
- del self._environ[envvar]
+ # Remember the initial value on the first access
+ if envvar not in self._changed:
+ self._changed[envvar] = os.environ.get(envvar)
+ if envvar in os.environ:
+ del os.environ[envvar]
def __enter__(self):
return self
def __exit__(self, *ignore_exc):
- for envvar, value in self._reset.iteritems():
- self._environ[envvar] = value
- for unset in self._unset:
- del self._environ[unset]
+ for (k, v) in self._changed.items():
+ if v is None:
+ if k in os.environ:
+ del os.environ[k]
+ else:
+ os.environ[k] = v
+
class TransientResource(object):
Modified: python/trunk/Misc/NEWS
==============================================================================
--- python/trunk/Misc/NEWS (original)
+++ python/trunk/Misc/NEWS Sat Apr 25 14:15:07 2009
@@ -875,6 +875,10 @@
- Issue #5083: New 'gui' resource for regrtest.
+- Issue #5837: Certain sequences of calls to set() and unset() for
+ support.EnvironmentVarGuard objects restored the environment variables
+ incorrectly on __exit__.
+
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