prompt: We are currently solving the following issue within our repository. Here is the issue text:
  --- BEGIN ISSUE ---
  The python_requirements macro retains no handle to the requirements file.
  This means changes in the requirements file do not result in changes in a live target graph (pantsd).
  
  --- END ISSUE ---
  
  Below are some code segments, each from a relevant file. One or more of these files may contain bugs.
  --- BEGIN FILES ---
  Path: `src/python/pants/backend/python/python_requirements.py`
  Content:
  ```
  1 # coding=utf-8
  2 # Copyright 2014 Pants project contributors (see CONTRIBUTORS.md).
  3 # Licensed under the Apache License, Version 2.0 (see LICENSE).
  4 
  5 from __future__ import absolute_import, division, print_function, unicode_literals
  6 
  7 import os
  8 from builtins import object, open
  9 
  10 
  11 class PythonRequirements(object):
  12   """Translates a pip requirements file into an equivalent set of python_requirements
  13 
  14   If the ``requirements.txt`` file has lines ``foo>=3.14`` and ``bar>=2.7``,
  15   then this is roughly like::
  16 
  17     python_requirement_library(name="foo", requirements=[
  18       python_requirement("foo>=3.14"),
  19     ])
  20     python_requirement_library(name="bar", requirements=[
  21       python_requirement("bar>=2.7"),
  22     ])
  23 
  24   NB some requirements files can't be unambiguously translated; ie: multiple
  25   find links.  For these files a ValueError will be raised that points out the issue.
  26 
  27   See the requirements file spec here:
  28   https://pip.pypa.io/en/latest/reference/pip_install.html#requirements-file-format
  29   """
  30 
  31   def __init__(self, parse_context):
  32     self._parse_context = parse_context
  33 
  34   def __call__(self, requirements_relpath='requirements.txt'):
  35     """
  36     :param string requirements_relpath: The relpath from this BUILD file to the requirements file.
  37     Defaults to a `requirements.txt` file sibling to the BUILD file.
  38     """
  39 
  40     requirements = []
  41     repository = None
  42 
  43     requirements_path = os.path.join(self._parse_context.rel_path, requirements_relpath)
  44     with open(requirements_path, 'r') as fp:
  45       for line in fp:
  46         line = line.strip()
  47         if line and not line.startswith('#'):
  48           if not line.startswith('-'):
  49             requirements.append(line)
  50           else:
  51             # handle flags we know about
  52             flag_value = line.split(' ', 1)
  53             if len(flag_value) == 2:
  54               flag = flag_value[0].strip()
  55               value = flag_value[1].strip()
  56               if flag in ('-f', '--find-links'):
  57                 if repository is not None:
  58                   raise ValueError('Only 1 --find-links url is supported per requirements file')
  59                 repository = value
  60 
  61     for requirement in requirements:
  62       req = self._parse_context.create_object('python_requirement', requirement,
  63                                               repository=repository)
  64       self._parse_context.create_object('python_requirement_library',
  65                                         name=req.project_name,
  66                                         requirements=[req])
  67
  ```
  --- END FILES ---
  
  Please first localize the bug based on the issue statement, and then generate a patch according to the `git diff` format fenced by three backticks.
  
  Here is an example:
  
  ```diff
  diff --git a/examples/server_async.py b/examples/server_async.py
  --- a/examples/server_async.py
  +++ b/examples/server_async.py
  @@ -313,4 +313,4 @@
   
   
   if __name__ == "__main__":
  -    asyncio.run(run_async_server("."), debug=True)
  +    asyncio.run(run_async_server(), debug=True)
  diff --git a/examples/server_sync.py b/examples/server_sync.py
  --- a/examples/server_sync.py
  +++ b/examples/server_sync.py
  @@ -313,5 +313,5 @@
   
   
   if __name__ == "__main__":
  -    server = run_sync_server(".")
  +    server = run_sync_server()
       server.shutdown()
  
  ```
  
golden_diff: diff --git a/src/python/pants/backend/python/python_requirements.py b/src/python/pants/backend/python/python_requirements.py
  --- a/src/python/pants/backend/python/python_requirements.py
  +++ b/src/python/pants/backend/python/python_requirements.py
  @@ -58,9 +58,16 @@
                     raise ValueError('Only 1 --find-links url is supported per requirements file')
                   repository = value
   
  +    requirements_file_target_name = requirements_relpath
  +    self._parse_context.create_object('files',
  +                                      name=requirements_file_target_name,
  +                                      sources=[requirements_relpath])
  +    requirements_dep = ':{}'.format(requirements_file_target_name)
  +
       for requirement in requirements:
         req = self._parse_context.create_object('python_requirement', requirement,
                                                 repository=repository)
         self._parse_context.create_object('python_requirement_library',
                                           name=req.project_name,
  -                                        requirements=[req])
  +                                        requirements=[req],
  +                                        dependencies=[requirements_dep])
  
verification_info: {"golden_diff": "diff --git a/src/python/pants/backend/python/python_requirements.py b/src/python/pants/backend/python/python_requirements.py\n--- a/src/python/pants/backend/python/python_requirements.py\n+++ b/src/python/pants/backend/python/python_requirements.py\n@@ -58,9 +58,16 @@\n                   raise ValueError('Only 1 --find-links url is supported per requirements file')\n                 repository = value\n \n+    requirements_file_target_name = requirements_relpath\n+    self._parse_context.create_object('files',\n+                                      name=requirements_file_target_name,\n+                                      sources=[requirements_relpath])\n+    requirements_dep = ':{}'.format(requirements_file_target_name)\n+\n     for requirement in requirements:\n       req = self._parse_context.create_object('python_requirement', requirement,\n                                               repository=repository)\n       self._parse_context.create_object('python_requirement_library',\n                                         name=req.project_name,\n-                                        requirements=[req])\n+                                        requirements=[req],\n+                                        dependencies=[requirements_dep])\n", "issue": "The python_requirements macro retains no handle to the requirements file.\nThis means changes in the requirements file do not result in changes in a live target graph (pantsd).\n", "before_files": [{"content": "# coding=utf-8\n# Copyright 2014 Pants project contributors (see CONTRIBUTORS.md).\n# Licensed under the Apache License, Version 2.0 (see LICENSE).\n\nfrom __future__ import absolute_import, division, print_function, unicode_literals\n\nimport os\nfrom builtins import object, open\n\n\nclass PythonRequirements(object):\n  \"\"\"Translates a pip requirements file into an equivalent set of python_requirements\n\n  If the ``requirements.txt`` file has lines ``foo>=3.14`` and ``bar>=2.7``,\n  then this is roughly like::\n\n    python_requirement_library(name=\"foo\", requirements=[\n      python_requirement(\"foo>=3.14\"),\n    ])\n    python_requirement_library(name=\"bar\", requirements=[\n      python_requirement(\"bar>=2.7\"),\n    ])\n\n  NB some requirements files can't be unambiguously translated; ie: multiple\n  find links.  For these files a ValueError will be raised that points out the issue.\n\n  See the requirements file spec here:\n  https://pip.pypa.io/en/latest/reference/pip_install.html#requirements-file-format\n  \"\"\"\n\n  def __init__(self, parse_context):\n    self._parse_context = parse_context\n\n  def __call__(self, requirements_relpath='requirements.txt'):\n    \"\"\"\n    :param string requirements_relpath: The relpath from this BUILD file to the requirements file.\n    Defaults to a `requirements.txt` file sibling to the BUILD file.\n    \"\"\"\n\n    requirements = []\n    repository = None\n\n    requirements_path = os.path.join(self._parse_context.rel_path, requirements_relpath)\n    with open(requirements_path, 'r') as fp:\n      for line in fp:\n        line = line.strip()\n        if line and not line.startswith('#'):\n          if not line.startswith('-'):\n            requirements.append(line)\n          else:\n            # handle flags we know about\n            flag_value = line.split(' ', 1)\n            if len(flag_value) == 2:\n              flag = flag_value[0].strip()\n              value = flag_value[1].strip()\n              if flag in ('-f', '--find-links'):\n                if repository is not None:\n                  raise ValueError('Only 1 --find-links url is supported per requirements file')\n                repository = value\n\n    for requirement in requirements:\n      req = self._parse_context.create_object('python_requirement', requirement,\n                                              repository=repository)\n      self._parse_context.create_object('python_requirement_library',\n                                        name=req.project_name,\n                                        requirements=[req])\n", "path": "src/python/pants/backend/python/python_requirements.py"}], "after_files": [{"content": "# coding=utf-8\n# Copyright 2014 Pants project contributors (see CONTRIBUTORS.md).\n# Licensed under the Apache License, Version 2.0 (see LICENSE).\n\nfrom __future__ import absolute_import, division, print_function, unicode_literals\n\nimport os\nfrom builtins import object, open\n\n\nclass PythonRequirements(object):\n  \"\"\"Translates a pip requirements file into an equivalent set of python_requirements\n\n  If the ``requirements.txt`` file has lines ``foo>=3.14`` and ``bar>=2.7``,\n  then this is roughly like::\n\n    python_requirement_library(name=\"foo\", requirements=[\n      python_requirement(\"foo>=3.14\"),\n    ])\n    python_requirement_library(name=\"bar\", requirements=[\n      python_requirement(\"bar>=2.7\"),\n    ])\n\n  NB some requirements files can't be unambiguously translated; ie: multiple\n  find links.  For these files a ValueError will be raised that points out the issue.\n\n  See the requirements file spec here:\n  https://pip.pypa.io/en/latest/reference/pip_install.html#requirements-file-format\n  \"\"\"\n\n  def __init__(self, parse_context):\n    self._parse_context = parse_context\n\n  def __call__(self, requirements_relpath='requirements.txt'):\n    \"\"\"\n    :param string requirements_relpath: The relpath from this BUILD file to the requirements file.\n    Defaults to a `requirements.txt` file sibling to the BUILD file.\n    \"\"\"\n\n    requirements = []\n    repository = None\n\n    requirements_path = os.path.join(self._parse_context.rel_path, requirements_relpath)\n    with open(requirements_path, 'r') as fp:\n      for line in fp:\n        line = line.strip()\n        if line and not line.startswith('#'):\n          if not line.startswith('-'):\n            requirements.append(line)\n          else:\n            # handle flags we know about\n            flag_value = line.split(' ', 1)\n            if len(flag_value) == 2:\n              flag = flag_value[0].strip()\n              value = flag_value[1].strip()\n              if flag in ('-f', '--find-links'):\n                if repository is not None:\n                  raise ValueError('Only 1 --find-links url is supported per requirements file')\n                repository = value\n\n    requirements_file_target_name = requirements_relpath\n    self._parse_context.create_object('files',\n                                      name=requirements_file_target_name,\n                                      sources=[requirements_relpath])\n    requirements_dep = ':{}'.format(requirements_file_target_name)\n\n    for requirement in requirements:\n      req = self._parse_context.create_object('python_requirement', requirement,\n                                              repository=repository)\n      self._parse_context.create_object('python_requirement_library',\n                                        name=req.project_name,\n                                        requirements=[req],\n                                        dependencies=[requirements_dep])\n", "path": "src/python/pants/backend/python/python_requirements.py"}]}