Fix crash when sys.stdin is None

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

@@ -6,13 +6,13 @@
 import logging
 import os
 import re
-import sys
 
 from pip._internal.utils.logging import indent_log
 from pip._internal.utils.misc import (
     display_path,
     rmtree,
     split_auth_from_netloc,
+    is_console_interactive
 )
 from pip._internal.utils.subprocess import make_command
 from pip._internal.utils.typing import MYPY_CHECK_RUNNING
@@ -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

@@ -50,7 +50,7 @@
     rmtree_errorhandler,
     split_auth_from_netloc,
     split_auth_netloc_from_url,
-)
+    is_console_interactive)
 from pip._internal.utils.setuptools_build import make_setuptools_shim_args
 
 
@@ -971,3 +971,29 @@ def test_make_setuptools_shim_args__unbuffered_output(unbuffered_output):
         unbuffered_output=unbuffered_output
     )
     assert ('-u' in args) == unbuffered_output
+
+
+def mock_stdin_isatty(monkeypatch, return_value):
+    monkeypatch.setattr(sys.stdin, 'isatty', Mock(return_value=return_value))
+
+
+def test_is_console_interactive_when_stdin_is_none_and_isatty_true(monkeypatch):
+    mock_stdin_isatty(monkeypatch, True)
+    monkeypatch.setattr(sys, 'stdin', None)
+    assert is_console_interactive() is False
+
+
+def test_is_console_interactive_when_stdin_is_none_and_isatty_false(monkeypatch):
+    mock_stdin_isatty(monkeypatch, False)
+    monkeypatch.setattr(sys, 'stdin', None)
+    assert is_console_interactive() is False
+
+
+def test_is_console_interactive_when_stdin_is_not_none_and_isatty_true(monkeypatch):
+    mock_stdin_isatty(monkeypatch, True)
+    assert is_console_interactive() is True
+
+
+def test_is_console_interactive_when_stdin_is_not_none_and_isatty_false(monkeypatch):
+    mock_stdin_isatty(monkeypatch, False)
+    assert is_console_interactive() is False