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[2.7] bpo-34791: xml package obeys ignore env flags (GH-9544) by miss-islington · Pull Request #9547 · python/cpython · GitHub

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[2.7] bpo-34791: xml package obeys ignore env flags (GH-9544) #9547

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Merged
vstinner merged 1 commit into from
Oct 19, 2018
Conversation 2 Commits 1 Checks 0 Files changed
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[2.7] bpo-34791: xml package obeys ignore env flags (GH-9544) #9547

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4 changes: 3 additions & 1 deletion Lib/xml/dom/domreg.py
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Original file line number Diff line number Diff line change
Expand Up @@ -8,6 +8,8 @@
# should be published by posting to xml-sig@python.org, and are
# subsequently recorded in this file.

import sys

well_known_implementations = {
'minidom':'xml.dom.minidom',
'4DOM': 'xml.dom.DOMImplementation',
Expand Down Expand Up @@ -57,7 +59,7 @@ def getDOMImplementation(name = None, features = ()):
return mod.getDOMImplementation()
elif name:
return registered[name]()
elif "PYTHON_DOM" in os.environ:
elif not sys.flags.ignore_environment and "PYTHON_DOM" in os.environ:
return getDOMImplementation(name = os.environ["PYTHON_DOM"])

# User did not specify a name, try implementations in arbitrary
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2 changes: 1 addition & 1 deletion Lib/xml/sax/__init__.py
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Expand Up @@ -59,7 +59,7 @@ def parseString(string, handler, errorHandler=ErrorHandler()):
import xml.sax.expatreader

import os, sys
if "PY_SAX_PARSER" in os.environ:
if not sys.flags.ignore_environment and "PY_SAX_PARSER" in os.environ:
default_parser_list = os.environ["PY_SAX_PARSER"].split(",")
del os

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3 changes: 3 additions & 0 deletions Misc/NEWS.d/next/Security/2018-09-24-18-49-25.bpo-34791.78GmIG.rst
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Original file line number Diff line number Diff line change
@@ -0,0 +1,3 @@
The xml.sax and xml.dom.domreg no longer use environment variables to
override parser implementations when sys.flags.ignore_environment is set by
-E or -I arguments.
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