trying to keep up pip-accel and py2deb with the latest version of pip

[artynet]

Hello @xolox ,

I am embarking myself in updating the underlying pip engine in pip-accel and py2deb. So far, I have whipped up this patch :

diff --git a/pip_accel/__init__.py b/pip_accel/__init__.py
index 5dc39f2..33d7f2d 100644
--- a/pip_accel/__init__.py
+++ b/pip_accel/__init__.py
@@ -70,13 +70,13 @@ from pip_accel.utils import (
 
 # External dependencies.
 from humanfriendly import concatenate, Timer, pluralize
-from pip import basecommand as pip_basecommand_module
-from pip import index as pip_index_module
-from pip import wheel as pip_wheel_module
-from pip.commands.download import DownloadCommand
-from pip.commands.install import InstallCommand
-from pip.exceptions import DistributionNotFound
-from pip.req import InstallRequirement
+from pip._internal.cli import base_command as pip_basecommand_module
+from pip._internal.index import package_finder as pip_index_module
+from pip._internal.models import wheel as pip_wheel_module
+from pip._internal.commands.download import DownloadCommand
+from pip._internal.commands.install import InstallCommand
+from pip._internal.exceptions import DistributionNotFound
+from pip._internal.req import InstallRequirement
 
 # Semi-standard module versioning.
 __version__ = '0.43'
@@ -391,7 +391,7 @@ class PipAccelerator(object):
         """
         unpack_timer = Timer()
         logger.info("Unpacking distribution(s) ..")
-        with PatchedAttribute(pip_basecommand_module, 'PackageFinder', CustomPackageFinder):
+        with PatchedAttribute(pip_index_module, 'PackageFinder', CustomPackageFinder):
             requirements = self.get_pip_requirement_set(arguments, use_remote_index=False, use_wheels=use_wheels)
             logger.info("Finished unpacking %s in %s.", pluralize(len(requirements), "distribution"), unpack_timer)
             return requirements
@@ -722,7 +722,7 @@ class SetupRequiresPatch(object):
         """Enable caching of setup requirements (by patching the ``run_egg_info()`` method)."""
         if self.patch is None:
             created_links = self.created_links
-            original_method = InstallRequirement.run_egg_info
+            original_method = InstallRequirement.metadata
             shared_directory = self.config.eggs_cache
 
             def run_egg_info_wrapper(self, *args, **kw):
@@ -743,7 +743,7 @@ class SetupRequiresPatch(object):
                 return original_method(self, *args, **kw)
 
             # Install the wrapper method for the duration of the context manager.
-            self.patch = PatchedAttribute(InstallRequirement, 'run_egg_info', run_egg_info_wrapper)
+            self.patch = PatchedAttribute(InstallRequirement, 'metadata', run_egg_info_wrapper)
             self.patch.__enter__()
 
     def __exit__(self, exc_type=None, exc_value=None, traceback=None):
diff --git a/pip_accel/req.py b/pip_accel/req.py
index ad2f61b..ae8a1a9 100644
--- a/pip_accel/req.py
+++ b/pip_accel/req.py
@@ -38,7 +38,7 @@ from pip_accel.utils import hash_files
 
 # External dependencies.
 from cached_property import cached_property
-from pip.req import InstallRequirement
+from pip._internal.req import InstallRequirement
 
 # The following package(s) are usually bundled with pip but may be unbundled
 # by redistributors and pip-accel should handle this gracefully.
diff --git a/pip_accel/utils.py b/pip_accel/utils.py
index 4b168c9..f14b53a 100644
--- a/pip_accel/utils.py
+++ b/pip_accel/utils.py
@@ -25,7 +25,7 @@ from pip_accel.compat import pathname2url, urljoin, WINDOWS
 
 # External dependencies.
 from humanfriendly import parse_path
-from pip.commands.uninstall import UninstallCommand
+from pip._internal.commands.uninstall import UninstallCommand
 
 # The following package(s) are usually bundled with pip but may be unbundled
 # by redistributors and pip-accel should handle this gracefully.
diff --git a/requirements.txt b/requirements.txt
index c344326..a579c41 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -1,5 +1,5 @@
 cached-property >= 0.1.5
 coloredlogs >= 3.0
 humanfriendly >= 1.44.7
-pip >= 8.1, < 8.2
+pip
 setuptools >= 7.0

but then, py2deb returns this error :

Traceback (most recent call last):
  File "/home/artynet/.local/lib/python3.7/site-packages/py2deb/cli.py", line 200, in main
    archives, relationships = converter.convert(arguments)
  File "/home/artynet/.local/lib/python3.7/site-packages/py2deb/converter.py", line 735, in convert
    self.packages_to_convert = list(self.get_source_distributions(pip_install_arguments))
  File "/home/artynet/.local/lib/python3.7/site-packages/py2deb/converter.py", line 792, in get_source_distributions
    for requirement in self.pip_accel.get_requirements(arguments):
  File "/home/artynet/.local/lib/python3.7/site-packages/pip_accel/__init__.py", line 299, in get_requirements
    return self.unpack_source_dists(arguments, use_wheels=use_wheels)
  File "/home/artynet/.local/lib/python3.7/site-packages/pip_accel/__init__.py", line 395, in unpack_source_dists
    requirements = self.get_pip_requirement_set(arguments, use_remote_index=False, use_wheels=use_wheels)
  File "/home/artynet/.local/lib/python3.7/site-packages/pip_accel/__init__.py", line 503, in get_pip_requirement_set
    command = DownloadCommand()
  File "/home/artynet/.local/lib/python3.7/site-packages/pip/_internal/commands/download.py", line 41, in __init__
    super(DownloadCommand, self).__init__(*args, **kw)
TypeError: __init__() missing 2 required positional arguments: 'name' and 'summary'

basically I can't figure out the right function the get the egg info. Any help would be appreciated...thanks in advance..

Arturo