inspect.getouterframes() tracebacks when $CWD does not exists

[msuchyredhatcom]

BPO	45406
Nosy	@ambv, @raulcd, @miss-islington, @iritkatriel
PRs	bpo-45406: make inspect.getmodule() return None when getabsfile() rai… #28824 [3.10] bpo-45406: make inspect.getmodule() return None when getabsfile() raises FileNotFoundError (GH-28824) #29377 [3.9] bpo-45406: make inspect.getmodule() return None when getabsfile() raises FileNotFoundError (GH-28824) #29378

^{Note: these values reflect the state of the issue at the time it was migrated and might not reflect the current state.}

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GitHub fields:

assignee = None
closed_at = <Date 2021-11-02.23:15:32.429>
created_at = <Date 2021-10-07.13:57:49.324>
labels = ['type-bug', 'library', '3.9', '3.10', '3.11']
title = 'inspect.getouterframes() tracebacks when $CWD does not exists'
updated_at = <Date 2021-11-02.23:15:32.428>
user = 'https://bugs.python.org/msuchyredhatcom'

bugs.python.org fields:

activity = <Date 2021-11-02.23:15:32.428>
actor = 'iritkatriel'
assignee = 'none'
closed = True
closed_date = <Date 2021-11-02.23:15:32.429>
closer = 'iritkatriel'
components = ['Library (Lib)']
creation = <Date 2021-10-07.13:57:49.324>
creator = 'msuchy@redhat.com'
dependencies = []
files = []
hgrepos = []
issue_num = 45406
keywords = ['patch']
message_count = 7.0
messages = ['403410', '403461', '403491', '405560', '405563', '405565', '405567']
nosy_count = 5.0
nosy_names = ['lukasz.langa', 'msuchy@redhat.com', 'raulcd', 'miss-islington', 'iritkatriel']
pr_nums = ['28824', '29377', '29378']
priority = 'normal'
resolution = 'fixed'
stage = 'resolved'
status = 'closed'
superseder = None
type = 'behavior'
url = 'https://bugs.python.org/issue45406'
versions = ['Python 3.9', 'Python 3.10', 'Python 3.11']

[msuchyredhatcom]

When you exec inspect.getouterframes() in directory, which no longer exists, then you get traceback, because the code traverse to os.getcwd() which fails.

Reproducer:

$ mkdir /tmp/bar
$ cd /tmp/bar
$ rmdir /tmp/bar
$ python3
Python 3.10.0rc2 (default, Sep  8 2021, 00:00:00) [GCC 11.2.1 20210728 (Red Hat 11.2.1-1)] on linux
Type "help", "copyright", "credits" or "license" for more information.
>>> import inspect
>>> inspect.getouterframes(inspect.currentframe())
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
  File "/usr/lib64/python3.10/inspect.py", line 1653, in getouterframes
    frameinfo = (frame,) + getframeinfo(frame, context)
  File "/usr/lib64/python3.10/inspect.py", line 1623, in getframeinfo
    filename = getsourcefile(frame) or getfile(frame)
  File "/usr/lib64/python3.10/inspect.py", line 829, in getsourcefile
    module = getmodule(object, filename)
  File "/usr/lib64/python3.10/inspect.py", line 861, in getmodule
    file = getabsfile(object, _filename)
  File "/usr/lib64/python3.10/inspect.py", line 845, in getabsfile
    return os.path.normcase(os.path.abspath(_filename))
  File "/usr/lib64/python3.10/posixpath.py", line 383, in abspath
    cwd = os.getcwd()
FileNotFoundError: [Errno 2] No such file or directory

[raulcd]

I have reproduced on python3.10 and validated this is also happening for other python versions:

# PYTHON 3.9
$ mkdir /tmp/bar
$ cd /tmp/bar
$ rmdir /tmp/bar
$ python3.9
Python 3.9.5 (default, May 19 2021, 11:32:47) 
[GCC 9.3.0] on linux
Type "help", "copyright", "credits" or "license" for more information.
>>> import inspect
>>> inspect.getouterframes(inspect.currentframe())
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
  File "/usr/lib/python3.9/inspect.py", line 1529, in getouterframes
    frameinfo = (frame,) + getframeinfo(frame, context)
  File "/usr/lib/python3.9/inspect.py", line 1499, in getframeinfo
    filename = getsourcefile(frame) or getfile(frame)
  File "/usr/lib/python3.9/inspect.py", line 709, in getsourcefile
    if getattr(getmodule(object, filename), '__loader__', None) is not None:
  File "/usr/lib/python3.9/inspect.py", line 738, in getmodule
    file = getabsfile(object, _filename)
  File "/usr/lib/python3.9/inspect.py", line 722, in getabsfile
    return os.path.normcase(os.path.abspath(_filename))
  File "/usr/lib/python3.9/posixpath.py", line 379, in abspath
    cwd = os.getcwd()
FileNotFoundError: [Errno 2] No such file or directory

# PYTHON 3.8
$ mkdir /tmp/bar
$ cd /tmp/bar
$ rmdir /tmp/bar
$ python3.8
Python 3.8.10 (default, Sep 28 2021, 16:10:42) 
[GCC 9.3.0] on linux
Type "help", "copyright", "credits" or "license" for more information.
>>> import inspect
>>> inspect.getouterframes(inspect.currentframe())
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
  File "/usr/lib/python3.8/inspect.py", line 1503, in getouterframes
    frameinfo = (frame,) + getframeinfo(frame, context)
  File "/usr/lib/python3.8/inspect.py", line 1473, in getframeinfo
    filename = getsourcefile(frame) or getfile(frame)
  File "/usr/lib/python3.8/inspect.py", line 708, in getsourcefile
    if getattr(getmodule(object, filename), '__loader__', None) is not None:
  File "/usr/lib/python3.8/inspect.py", line 737, in getmodule
    file = getabsfile(object, _filename)
  File "/usr/lib/python3.8/inspect.py", line 721, in getabsfile
    return os.path.normcase(os.path.abspath(_filename))
  File "/usr/lib/python3.8/posixpath.py", line 379, in abspath
    cwd = os.getcwd()
FileNotFoundError: [Errno 2] No such file or directory
Error in sys.excepthook:
Traceback (most recent call last):
  File "/usr/lib/python3/dist-packages/apport_python_hook.py", line 76, in apport_excepthook
    binary = os.path.realpath(os.path.join(os.getcwd(), sys.argv[0]))
FileNotFoundError: [Errno 2] No such file or directory

Original exception was:
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
  File "/usr/lib/python3.8/inspect.py", line 1503, in getouterframes
    frameinfo = (frame,) + getframeinfo(frame, context)
  File "/usr/lib/python3.8/inspect.py", line 1473, in getframeinfo
    filename = getsourcefile(frame) or getfile(frame)
  File "/usr/lib/python3.8/inspect.py", line 708, in getsourcefile
    if getattr(getmodule(object, filename), '__loader__', None) is not None:
  File "/usr/lib/python3.8/inspect.py", line 737, in getmodule
    file = getabsfile(object, _filename)
  File "/usr/lib/python3.8/inspect.py", line 721, in getabsfile
    return os.path.normcase(os.path.abspath(_filename))
  File "/usr/lib/python3.8/posixpath.py", line 379, in abspath
    cwd = os.getcwd()
FileNotFoundError: [Errno 2] No such file or directory
>>>

[iritkatriel]

Thanks for the report, crash typically refers to segfaults rather than exceptions being raised. Updated versions.

[ambv]

New changeset a459a81 by Irit Katriel in branch 'main':
bpo-45406: make inspect.getmodule() return None when getabsfile() raises FileNotFoundError (GH-28824)
a459a81

[miss-islington]

New changeset cfdd7d2 by Miss Islington (bot) in branch '3.10':
bpo-45406: make inspect.getmodule() return None when getabsfile() raises FileNotFoundError (GH-28824)
cfdd7d2

[miss-islington]

New changeset 5f527ca by Miss Islington (bot) in branch '3.9':
bpo-45406: make inspect.getmodule() return None when getabsfile() raises FileNotFoundError (GH-28824)
5f527ca

[iritkatriel]

Thanks Lukasz.