[issue19884] Importing readline produces erroneous output

[Martin Panter]

Martin Panter added the comment:

I committed my patch in full, so hopefully the Gnu Readline situation on OS X 
is also improved. Original fixes went into 3.4, but my patch only went into 
3.5+.

--
resolution:  -> fixed
stage: patch review -> resolved
status: open -> closed
versions: +Python 3.4

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[issue19884] Importing readline produces erroneous output

[Roundup Robot]

Roundup Robot added the comment:

New changeset 55ec5fdc3099 by Martin Panter in branch '2.7':
Issue #19884: Avoid spurious output on OS X with Gnu Readline
https://hg.python.org/cpython/rev/55ec5fdc3099

New changeset 782d9b5d2e90 by Martin Panter in branch '3.5':
Issue #19884: Avoid spurious output on OS X with Gnu Readline
https://hg.python.org/cpython/rev/782d9b5d2e90

New changeset 72e034afeb55 by Martin Panter in branch 'default':
Issue #19884: Merge Readline updates from 3.5
https://hg.python.org/cpython/rev/72e034afeb55

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[issue19884] Importing readline produces erroneous output

[Martin Panter]

Martin Panter added the comment:

Thanks, I can try to commit the version fix part of the patch when I get a 
chance. What is EL6.8, is that a Red Hat (Enterprise Linux) thing?

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[issue19884] Importing readline produces erroneous output

[Orion Poplawski]

Orion Poplawski added the comment:

Updating the version check to 6.1 as in the patch from Martin certainly avoids 
the failing test.

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[issue19884] Importing readline produces erroneous output

[Orion Poplawski]

Orion Poplawski added the comment:

I'm still seeing this test failure on EL6.8 with python 3.4.5:

[268/391] test_readline
testHistoryUpdates (test.test_readline.TestHistoryManipulation) ... ok
test_init (test.test_readline.TestReadline) ... test test_readline failed
FAIL
==
FAIL: test_init (test.test_readline.TestReadline)
--
Traceback (most recent call last):
  File "/builddir/build/BUILD/Python-3.4.5/Lib/test/test_readline.py", line 57, 
in test_init
self.assertEqual(stdout, b'')
AssertionError: b'\x1b[?1034h' != b''
--
Ran 2 tests in 0.111s
FAILED (failures=1)

With readline-devel-6.0-4.el6.x86_64.

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[issue19884] Importing readline produces erroneous output

[Martin Panter]

Martin Panter added the comment:

Here is a patch to enable the workaround on OS X, and to adjust the test 
condition to 6.1. It would be nice if someone with OS X and Gnu Readline can 
confirm that this fixes the problem.

--
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Added file: http://bugs.python.org/file43448/meta-osx.patch

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[issue19884] Importing readline produces erroneous output

[Martin Panter]

Martin Panter added the comment:

Yogesh: Victor’s patch has already been applied. What is left to do is another 
patch that enables Victor’s code on OS X when Gnu Readline is being used, as 
opposed to the usual Apple Editline.

Also, I think it is valid to update the version check to 6.1. According to 
, enable-meta-key is in 
6.1, but not 6.0. On 6.0 the code probably has no effect.

--
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[issue19884] Importing readline produces erroneous output

[Yogesh Joshi]

Yogesh Joshi added the comment:

I tried applying this patch and its failing and throwing the following error:

patching file Lib/test/test_readline.py
Hunk #1 FAILED at 1.
Hunk #2 FAILED at 43.
2 out of 2 hunks FAILED -- saving rejects to file Lib/test/test_readline.py.rej
patching file Modules/readline.c
Hunk #1 FAILED at 1019.
1 out of 1 hunk FAILED -- saving rejects to file Modules/readline.c.rej

I'm using Mac Os El Captain

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[issue19884] Importing readline produces erroneous output

[Berker Peksag]

Berker Peksag added the comment:

The version check doesn't work because 0ed1801bf4bd added #ifndef __APPLE__ to 
guard the code, so if you're using readline on OS X, that rl_variable_bind 
workaround won't work.

There are two alternatives:

1) convert ifndef to ifdef and add a check for the ``using_libedit_emulation`` 
variable.

#ifdef __APPLE__
if (using_libedit_emulation) {
...
...

looks like a common idiom in readline.c.


2) just skip the test if _READLINE_VERSION < 0x0603

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[issue19884] Importing readline produces erroneous output

[Isaac Schwabacher]

Isaac Schwabacher added the comment:

From the OP:

 This was reported at [1] and originally at [2]. The readline maintainer 
 suggests [3] using:
 
 rl_variable_bind (enable-meta-key, off);
 
 which was introduced in readline 6.1. Do you think it'd be safe to add the 
 above line?

From 3.4.3 final:

 @unittest.skipIf(readline._READLINE_VERSION  0x0600
  and libedit not in readline.__doc__,
  not supported in this library version)


The test currently fails on readline version 6.0.  The version to test on needs 
a bump to 0x0610.

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[issue19884] Importing readline produces erroneous output

[Isaac Schwabacher]

Isaac Schwabacher added the comment:

Whoops, that's 0x0601.  Though Maxime gives evidence that the version should in 
fact be 0x0603.  (Note that while OS X ships with libedit over libreadline, 
anyone who wants to can install the real thing instead of that pale imitation; 
the test would have been skipped if Maxime were using libedit.)

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[issue19884] Importing readline produces erroneous output

[STINNER Victor]

STINNER Victor added the comment:

Mac OS X uses libedit, not libreadline.

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[issue19884] Importing readline produces erroneous output

[Maxime Belanger]

Maxime Belanger added the comment:

I think the version check (`readline._READLINE_VERSION  0x0600`) is incorrect, 
as the test still fails for me on Mac OS X 10.9 with readline version 6.2 
(0x602). Upgrading to 6.3 (0x603) fixes it, though.

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[issue19884] Importing readline produces erroneous output

[Vinson Lee]

Changes by Vinson Lee v...@freedesktop.org:


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[issue19884] Importing readline produces erroneous output

[STINNER Victor]

STINNER Victor added the comment:

Arfever, Antoine: If buildbots are happy (green), you can close the issue. (I'm 
answering to your question on IRC ;-))

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[issue19884] Importing readline produces erroneous output

[Roundup Robot]

Roundup Robot added the comment:

New changeset c4b5a5d44254 by Antoine Pitrou in branch '3.4':
Issue #22773: fix failing test with old readline versions due to issue #19884.
https://hg.python.org/cpython/rev/c4b5a5d44254

New changeset be374b8c40c8 by Antoine Pitrou in branch 'default':
Issue #22773: fix failing test with old readline versions due to issue #19884.
https://hg.python.org/cpython/rev/be374b8c40c8

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[issue19884] Importing readline produces erroneous output

[Roundup Robot]

Roundup Robot added the comment:

New changeset eba6e68e818c by Antoine Pitrou in branch '2.7':
Issue #22773: fix failing test with old readline versions due to issue #19884.
https://hg.python.org/cpython/rev/eba6e68e818c

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[issue19884] Importing readline produces erroneous output

[David Edelsohn]

David Edelsohn added the comment:

Issue22773 provides a patch to export Readline version and skip the test for 
earlier releases of libreadline where turning off enable-meta-key does not work.

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[issue19884] Importing readline produces erroneous output

[Arfrever Frehtes Taifersar Arahesis]

Changes by Arfrever Frehtes Taifersar Arahesis arfrever@gmail.com:


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[issue19884] Importing readline produces erroneous output

[Stefan Krah]

Changes by Stefan Krah stefan-use...@bytereef.org:


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[issue19884] Importing readline produces erroneous output

[Jesús Cea Avión]

Changes by Jesús Cea Avión j...@jcea.es:


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[issue19884] Importing readline produces erroneous output

[Ned Deily]

Ned Deily added the comment:

Should this be a release blocker for 3.4.2?

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[issue19884] Importing readline produces erroneous output

[STINNER Victor]

STINNER Victor added the comment:

The test fails on some platforms but it's not a regression.

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[issue19884] Importing readline produces erroneous output

[Benjamin Peterson]

Benjamin Peterson added the comment:

It seems this bug was fixed properly by readline in version 6.3; rl_initialize 
won't put meta codes on the screen. Frankly, I'm surprised distros like Fedora 
haven't upgraded or patched readline themselves to fix this. Aren't other 
programs affected?

Turning off enable-meta-key isn't great, since it doesn't work on older 
readline or libedit, and is probably technically a backwards compatibility 
problem.

I think the best solution would be not call rl_initialize during the 
initialization of the readline module, but I'm not sure if that could create 
compatibility problems.

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[issue19884] Importing readline produces erroneous output

[Geoffrey Spear]

Changes by Geoffrey Spear geoffsp...@gmail.com:


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[issue19884] Importing readline produces erroneous output

[Edd Barrett]

Edd Barrett added the comment:

This problem shows up on OpenBSD too. It breaks 'hg view' also.

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[issue19884] Importing readline produces erroneous output

[Remi Pointel]

Changes by Remi Pointel pyt...@xiri.fr:


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[issue19884] Importing readline produces erroneous output

[STINNER Victor]

STINNER Victor added the comment:

Oh, the test also fails on the new Red Hat 6 buildbot:

http://buildbot.python.org/all/builders/x86%20RHEL%206%203.x/builds/4358/steps/test/logs/stdio

==
FAIL: test_init (test.test_readline.TestReadline)
--
Traceback (most recent call last):
  File 
/home/buildbot/buildarea/3.x.coghlan-redhat/build/Lib/test/test_readline.py, 
line 53, in test_init
self.assertEqual(stdout, b'')
AssertionError: b'\x1b[?1034h' != b''

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[issue19884] Importing readline produces erroneous output

[STINNER Victor]

STINNER Victor added the comment:

The test fails also on OpenBSD:

http://buildbot.python.org/all/builders/x86%20OpenBSD%205.5%203.x/builds/671/steps/test/logs/stdio

==
FAIL: test_init (test.test_readline.TestReadline)
--
Traceback (most recent call last):
  File 
/home/python-builds/3.x.borja-openbsd-x86/build/Lib/test/test_readline.py, 
line 53, in test_init
self.assertEqual(stdout, b'')
AssertionError: b'\x1b[?1034h' != b''

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[issue19884] Importing readline produces erroneous output

[Roundup Robot]

Roundup Robot added the comment:

New changeset 0177d8a4e82a by Victor Stinner in branch '2.7':
Issue #19884: readline: Disable the meta modifier key if stdout is not a
http://hg.python.org/cpython/rev/0177d8a4e82a

New changeset 6303266beb80 by Victor Stinner in branch '3.4':
Issue #19884: readline: Disable the meta modifier key if stdout is not a
http://hg.python.org/cpython/rev/6303266beb80

New changeset f85a968f9e01 by Victor Stinner in branch 'default':
(Merge 3.4) Issue #19884: readline: Disable the meta modifier key if stdout is
http://hg.python.org/cpython/rev/f85a968f9e01

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[issue19884] Importing readline produces erroneous output

[STINNER Victor]

STINNER Victor added the comment:

I commited my patch.

--
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status: open - closed

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[issue19884] Importing readline produces erroneous output

[STINNER Victor]

STINNER Victor added the comment:

The test fails on AMD64 OpenIndiana 2.7:

http://buildbot.python.org/all/builders/AMD64%20OpenIndiana%202.7/builds/2354/steps/test/logs/stdio

test test_readline failed -- Traceback (most recent call last):
  File 
/export/home/buildbot/64bits/2.7.cea-indiana-amd64/build/Lib/test/test_readline.py,
 line 52, in test_init
self.assertEqual(stdout, b'')
AssertionError: '\x1b[?1034h' != ''

--
resolution: fixed - 
status: closed - open

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[issue19884] Importing readline produces erroneous output

[Ned Deily]

Ned Deily added the comment:

The changes are also causing segfaults when readline is linked with BSD libedit 
(the default on OS X) rather than GNU readline:

==
FAIL: test_init (test.test_readline.TestReadline)
--
Traceback (most recent call last):
  File /py/dev/3x/source/Lib/test/test_readline.py, line 52, in test_init
TERM='xterm-256color')
  File /py/dev/3x/source/Lib/test/script_helper.py, line 69, in 
assert_python_ok
return _assert_python(True, *args, **env_vars)
  File /py/dev/3x/source/Lib/test/script_helper.py, line 55, in _assert_python
stderr follows:\n%s % (rc, err.decode('ascii', 'ignore')))
AssertionError: Process return code is -11, stderr follows:
Fatal Python error: Segmentation fault

Current thread 0x7fff75489310 (most recent call first):
  File frozen importlib._bootstrap, line 321 in _call_with_frames_removed
  File frozen importlib._bootstrap, line 1664 in load_module
  File frozen importlib._bootstrap, line 540 in _check_name_wrapper
  File frozen importlib._bootstrap, line 1110 in _load_backward_compatible
  File frozen importlib._bootstrap, line 1140 in _load_unlocked
  File frozen importlib._bootstrap, line 2175 in _find_and_load_unlocked
  File frozen importlib._bootstrap, line 2186 in _find_and_load
  File string, line 1 in module

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[issue19884] Importing readline produces erroneous output

[STINNER Victor]

STINNER Victor added the comment:

 The changes are also causing segfaults when readline is linked with BSD 
 libedit (the default on OS X) rather than GNU readline:

Oh wow. Do you have an idea of to fix the issue with libedit? Or make
the code condition, only use it with native readline?

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[issue19884] Importing readline produces erroneous output

[Ned Deily]

Ned Deily added the comment:

Currently, readline.c uses #ifdef __APPLE__ to guard libedit-specific code 
(there is another open issue to generalize libedit support to other platforms).

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[issue19884] Importing readline produces erroneous output

[Roundup Robot]

Roundup Robot added the comment:

New changeset f0ab6f9f0603 by Victor Stinner in branch '2.7':
Issue #19884, readline: calling rl_variable_bind (enable-meta-key, off)
http://hg.python.org/cpython/rev/f0ab6f9f0603

New changeset 3f08c1156050 by Victor Stinner in branch '3.4':
Issue #19884, readline: calling rl_variable_bind (enable-meta-key, off)
http://hg.python.org/cpython/rev/3f08c1156050

New changeset 0ed1801bf4bd by Victor Stinner in branch 'default':
(Merge 3.4) Issue #19884, readline: calling rl_variable_bind
http://hg.python.org/cpython/rev/0ed1801bf4bd

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[issue19884] Importing readline produces erroneous output

[STINNER Victor]

STINNER Victor added the comment:

Attached readline_disable_meta_key.patch: Implement the workaround suggested in 
(*), but only use the workaround if stdout is not a TTY (ex: output 
redirected), to limit the risk of regression.

(*) http://lists.gnu.org/archive/html/bug-readline/2011-04/msg9.html

Extract of the patch:

+if (!isatty(STDOUT_FILENO)) {
+/* Issue #19884: Don't try to enable any meta modifier key the terminal
+   claims to support when it is called. On many terminals (ex:
+   xterm-256color), the meta key is used to send eight-bit characters
+   (ANSI sequence \033[1034h). */
+rl_variable_bind (enable-meta-key, off);
+}

This issue becomes very annoying on my Fedora 20. The output of any Mercurial 
command now starts with \033.[?1034h (Mercurial uses Python 2.7). Example:

haypo@smithers$ hg root|hexdump -C
  1b 5b 3f 31 30 33 34 68  2f 68 6f 6d 65 2f 68 61  |.[?1034h/home/ha|
0010  79 70 6f 2f 70 72 6f 67  2f 70 79 74 68 6f 6e 2f  |ypo/prog/python/|
0020  64 65 66 61 75 6c 74 0a   |default.|
0028

Fedora 18 changed the default TERM environment variable to xterm-256color:
http://fedoraproject.org/wiki/Features/256_Color_Terminals

Workaround in your application (to run on unpatched Python): set the TERM 
environment variable to dummy, or unset this variable.

--
keywords: +patch
nosy: +haypo
Added file: http://bugs.python.org/file35589/readline_disable_meta_key.patch

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[issue19884] Importing readline produces erroneous output

[Antoine Pitrou]

Antoine Pitrou added the comment:

We seem to have gotten bit by this in issue21425.

Dave, is it possible for you to validate the proposed fix? I can't test this 
under Ubuntu.

Setting priority to high as it seems to actually annoy many people:

http://stackoverflow.com/questions/15760712/python-readline-module-prints-escape-character-during-import
http://reinout.vanrees.org/weblog/2009/08/14/readline-invisible-character-hack.html
http://lists.gnu.org/archive/html/bug-readline/2007-08/msg4.html

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nosy: +skrah
priority: normal - high
versions: +Python 3.5 -Python 3.3

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[issue19884] Importing readline produces erroneous output

[Bohuslav Slavek Kabrda]

Bohuslav Slavek Kabrda added the comment:

I can also reproduce it on Arch Linux. It seems that the bad characters are 
only output if env variable TERM starts with xterm.

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[issue19884] Importing readline produces erroneous output

[Bohuslav Slavek Kabrda]

New submission from Bohuslav Slavek Kabrda:

A simple reproducer:

python -c 'import readline' | xxd
000: 1b5b 3f31 3033 3468  .[?1034h

This was reported at [1] and originally at [2]. The readline maintainer 
suggests [3] using:

rl_variable_bind (enable-meta-key, off);

which was introduced in readline 6.1. Do you think it'd be safe to add the 
above line?

Thanks.

[1] https://bugzilla.redhat.com/show_bug.cgi?id=880393
[2] https://bugzilla.redhat.com/show_bug.cgi?id=593799
[3] http://lists.gnu.org/archive/html/bug-readline/2011-04/msg9.html

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components: Extension Modules
messages: 205217
nosy: bkabrda
priority: normal
severity: normal
status: open
title: Importing readline produces erroneous output
versions: Python 2.7, Python 3.3

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[issue19884] Importing readline produces erroneous output

[Antoine Pitrou]

Antoine Pitrou added the comment:

I can't reproduce under Ubuntu 13.10. Is this Red Hat-specific?

(according to Dave, This is a readline bug; it looks like it should not emit 
those characters when stdout is not a tty)

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nosy: +dmalcolm, pitrou
versions: +Python 3.4

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[issue19884] Importing readline produces erroneous output

[Vajrasky Kok]

Vajrasky Kok added the comment:

Reproducible under Fedora 18.

$ ./python -c import readline | hexdump -C
  1b 5b 3f 31 30 33 34 68   |.[?1034h|
0008

$ TERM=dumb ./python -c import readline | hexdump -C

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