ValueError raised when parsing malformed requirements files

[ret2libc]

Description

A requirements file with malformed texts, such as one having just one " double-quote but not the ending one, would result in pip terminating with a ValueError exception.

Expected behavior

The malformed requirements line should be treated as a regular parsing error.

pip version

22.3.dev0

Python version

3.10

OS

MacOS / any

How to Reproduce

1. Write a requirements.txt file with --"hello
2. Run pip install -r ./requirements.txt

Output

ERROR: Exception:
Traceback (most recent call last):
  File "pip/src/pip/_internal/cli/base_command.py", line 167, in exc_logging_wrapper
    status = run_func(*args)
  File "pip/src/pip/_internal/cli/req_command.py", line 247, in wrapper
    return func(self, options, args)
  File "pip/src/pip/_internal/commands/install.py", line 341, in run
    reqs = self.get_requirements(args, options, finder, session)
  File "pip/src/pip/_internal/cli/req_command.py", line 433, in get_requirements
    for parsed_req in parse_requirements(
  File "pip/src/pip/_internal/req/req_file.py", line 145, in parse_requirements
    for parsed_line in parser.parse(filename, constraint):
  File "pip/src/pip/_internal/req/req_file.py", line 331, in parse
    yield from self._parse_and_recurse(filename, constraint)
  File "pip/src/pip/_internal/req/req_file.py", line 336, in _parse_and_recurse
    for line in self._parse_file(filename, constraint):
  File "pip/src/pip/_internal/req/req_file.py", line 373, in _parse_file
    args_str, opts = self._line_parser(line)
  File "pip/src/pip/_internal/req/req_file.py", line 400, in parse_line
    options = shlex.split(options_str)
  File "/opt/homebrew/Cellar/python@3.10/3.10.7/Frameworks/Python.framework/Versions/3.10/lib/python3.10/shlex.py", line 315, in split
    return list(lex)
  File "/opt/homebrew/Cellar/python@3.10/3.10.7/Frameworks/Python.framework/Versions/3.10/lib/python3.10/shlex.py", line 300, in __next__
    token = self.get_token()
  File "/opt/homebrew/Cellar/python@3.10/3.10.7/Frameworks/Python.framework/Versions/3.10/lib/python3.10/shlex.py", line 109, in get_token
    raw = self.read_token()
  File "/opt/homebrew/Cellar/python@3.10/3.10.7/Frameworks/Python.framework/Versions/3.10/lib/python3.10/shlex.py", line 191, in read_token
    raise ValueError("No closing quotation")
ValueError: No closing quotation

Code of Conduct

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[pfmoore]

Good catch - and thanks for following up with a PR 🙂