Fix crash when sys.stdin is None (#7118)

news/7118.bugfix

@@ -0,0 +1 @@
+Fix a crash when ``sys.stdin`` is set to ``None``, such as on AWS Lambda.

news/7119.bugfix

@@ -0,0 +1 @@
+Fix a crash when ``sys.stdin`` is set to ``None``, such as on AWS Lambda.

src/pip/_internal/utils/misc.py

@@ -864,3 +864,10 @@ def protect_pip_from_modification_on_windows(modifying_pip):
  'To modify pip, please run the following command:\n{}'
  .format(" ".join(new_command))
  )
+
+
+def is_console_interactive():
+ # type: () -> bool
+ """Is this console interactive?
+ """
+ return sys.stdin is not None and sys.stdin.isatty()

src/pip/_internal/vcs/subversion.py

@@ -6,11 +6,11 @@
 import logging
 import os
 import re
-import sys
 
 from pip._internal.utils.logging import indent_log
 from pip._internal.utils.misc import (
  display_path,
+ is_console_interactive,
  rmtree,
  split_auth_from_netloc,
 )
@@ -188,7 +188,7 @@ def is_commit_id_equal(cls, dest, name):
  def __init__(self, use_interactive=None):
  # type: (bool) -> None
  if use_interactive is None:
- use_interactive = sys.stdin.isatty()
+ use_interactive = is_console_interactive()
  self.use_interactive = use_interactive
 
  # This member is used to cache the fetched version of the current

tests/unit/test_utils.py

@@ -39,6 +39,7 @@
  get_prog,
  hide_url,
  hide_value,
+ is_console_interactive,
  normalize_path,
  normalize_version_info,
  parse_netloc,
@@ -971,3 +972,18 @@ def test_make_setuptools_shim_args__unbuffered_output(unbuffered_output):
  unbuffered_output=unbuffered_output
  )
  assert ('-u' in args) == unbuffered_output
+
+
+@pytest.mark.parametrize('isatty,no_stdin,expected', [
+ (True, False, True),
+ (False, False, False),
+ (True, True, False),
+ (False, True, False),
+])
+def test_is_console_interactive(monkeypatch, isatty, no_stdin, expected):
+ monkeypatch.setattr(sys.stdin, 'isatty', Mock(return_value=isatty))
+
+ if no_stdin:
+ monkeypatch.setattr(sys, 'stdin', None)
+
+ assert is_console_interactive() is expected