[Bug 1834236] Re: sphinx autopkgtest failures with Python 3.7.4 RC1

[Iain Lane]

laney at raleigh> python3.7 --version
Python 3.7.3
laney at raleigh> python3.7 -c "import codecs; codecs.open('/home/laney/temp/sphinx/tests/roots/test-root/wrongenc.inc', encoding='utf-8-sig', errors='strict').read()"
Traceback (most recent call last):
  File "<string>", line 1, in <module>
  File "/usr/lib/python3.7/codecs.py", line 701, in read
    return self.reader.read(size)
  File "/usr/lib/python3.7/codecs.py", line 504, in read
    newchars, decodedbytes = self.decode(data, self.errors)
  File "/usr/lib/python3.7/encodings/utf_8_sig.py", line 117, in decode
    return codecs.utf_8_decode(input, errors)
UnicodeDecodeError: 'utf-8' codec can't decode byte 0xdf in position 70: invalid continuation byte
laney at raleigh> lxc exec e-amd64 -- python3.7 --version
Python 3.7.4rc1
laney at raleigh> lxc exec e-amd64 -- python3.7 -c "import codecs; codecs.open('/home/laney/temp/sphinx/tests/roots/test-root/wrongenc.inc', encoding='utf-8-sig', errors='strict').read()"

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https://bugs.launchpad.net/bugs/1834236

Title:
  codecs.open(errors='strict') doesn't fail on invalid encoding with
  python3.7.4 RC1

Status in python3.7 package in Ubuntu:
  New

Bug description:
  The autopkgtests for package sphinx passed with Python 3.7.3, and
  regressed with 3.7.4 RC1.

  See http://autopkgtest.ubuntu.com/packages/s/sphinx/eoan/amd64 (first
  failure on 2019-06-25 03:04:04 UTC).

  This upstream commit appears to fix the problem: https://github.com
  /sphinx-doc/sphinx/commit/02fea02

  This might be an indication that there's a bug in codecs.open in
  Python 3.7.4 RC1 ?

  ProblemType: Bug
  DistroRelease: Ubuntu 19.10
  Package: python3.7 3.7.4~rc1-1
  ProcVersionSignature: Ubuntu 5.0.0-17.18-generic 5.0.8
  Uname: Linux 5.0.0-17-generic x86_64
  ApportVersion: 2.20.11-0ubuntu3
  Architecture: amd64
  CurrentDesktop: ubuntu:GNOME
  Date: Tue Jun 25 20:09:54 2019
  InstallationDate: Installed on 2018-08-21 (308 days ago)
  InstallationMedia: Ubuntu 18.10 "Cosmic Cuttlefish" - Alpha amd64 (20180821)
  SourcePackage: python3.7
  UpgradeStatus: Upgraded to eoan on 2019-06-05 (20 days ago)

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