Including the venv

lib/python3.8/site-packages/pip/_internal/distributions/__init__.py

@@ -0,0 +1,23 @@
+from pip._internal.distributions.source import SourceDistribution
+from pip._internal.distributions.wheel import WheelDistribution
+
+from pip._internal.utils.typing import MYPY_CHECK_RUNNING
+
+if MYPY_CHECK_RUNNING:
+    from pip._internal.distributions.base import AbstractDistribution
+    from pip._internal.req.req_install import InstallRequirement
+
+
+def make_distribution_for_install_requirement(install_req):
+    # type: (InstallRequirement) -> AbstractDistribution
+    """Returns a Distribution for the given InstallRequirement
+    """
+    # If it's not an editable, is a wheel, it's a WheelDistribution
+    if install_req.editable:
+        return SourceDistribution(install_req)
+
+    if install_req.link and install_req.is_wheel:
+        return WheelDistribution(install_req)
+
+    # Otherwise, a SourceDistribution
+    return SourceDistribution(install_req)

lib/python3.8/site-packages/pip/_internal/distributions/base.py

@@ -0,0 +1,33 @@
+import abc
+
+from pip._vendor.six import add_metaclass
+
+
+@add_metaclass(abc.ABCMeta)
+class AbstractDistribution(object):
+    """A base class for handling installable artifacts.
+
+    The requirements for anything installable are as follows:
+
+     - we must be able to determine the requirement name
+       (or we can't correctly handle the non-upgrade case).
+
+     - for packages with setup requirements, we must also be able
+       to determine their requirements without installing additional
+       packages (for the same reason as run-time dependencies)
+
+     - we must be able to create a Distribution object exposing the
+       above metadata.
+    """
+
+    def __init__(self, req):
+        super(AbstractDistribution, self).__init__()
+        self.req = req
+
+    @abc.abstractmethod
+    def get_pkg_resources_distribution(self):
+        raise NotImplementedError()
+
+    @abc.abstractmethod
+    def prepare_distribution_metadata(self, finder, build_isolation):
+        raise NotImplementedError()

lib/python3.8/site-packages/pip/_internal/distributions/installed.py

@@ -0,0 +1,15 @@
+from pip._internal.distributions.base import AbstractDistribution
+
+
+class InstalledDistribution(AbstractDistribution):
+    """Represents an installed package.
+
+    This does not need any preparation as the required information has already
+    been computed.
+    """
+
+    def get_pkg_resources_distribution(self):
+        return self.req.satisfied_by
+
+    def prepare_distribution_metadata(self, finder, build_isolation):
+        pass

lib/python3.8/site-packages/pip/_internal/distributions/source.py

@@ -0,0 +1,80 @@
+import logging
+
+from pip._internal.build_env import BuildEnvironment
+from pip._internal.distributions.base import AbstractDistribution
+from pip._internal.exceptions import InstallationError
+
+logger = logging.getLogger(__name__)
+
+
+class SourceDistribution(AbstractDistribution):
+    """Represents a source distribution.
+
+    The preparation step for these needs metadata for the packages to be
+    generated, either using PEP 517 or using the legacy `setup.py egg_info`.
+
+    NOTE from @pradyunsg (14 June 2019)
+    I expect SourceDistribution class will need to be split into
+    `legacy_source` (setup.py based) and `source` (PEP 517 based) when we start
+    bringing logic for preparation out of InstallRequirement into this class.
+    """
+
+    def get_pkg_resources_distribution(self):
+        return self.req.get_dist()
+
+    def prepare_distribution_metadata(self, finder, build_isolation):
+        # Prepare for building. We need to:
+        #   1. Load pyproject.toml (if it exists)
+        #   2. Set up the build environment
+
+        self.req.load_pyproject_toml()
+        should_isolate = self.req.use_pep517 and build_isolation
+
+        def _raise_conflicts(conflicting_with, conflicting_reqs):
+            raise InstallationError(
+                "Some build dependencies for %s conflict with %s: %s." % (
+                    self.req, conflicting_with, ', '.join(
+                        '%s is incompatible with %s' % (installed, wanted)
+                        for installed, wanted in sorted(conflicting))))
+
+        if should_isolate:
+            # Isolate in a BuildEnvironment and install the build-time
+            # requirements.
+            self.req.build_env = BuildEnvironment()
+            self.req.build_env.install_requirements(
+                finder, self.req.pyproject_requires, 'overlay',
+                "Installing build dependencies"
+            )
+            conflicting, missing = self.req.build_env.check_requirements(
+                self.req.requirements_to_check
+            )
+            if conflicting:
+                _raise_conflicts("PEP 517/518 supported requirements",
+                                 conflicting)
+            if missing:
+                logger.warning(
+                    "Missing build requirements in pyproject.toml for %s.",
+                    self.req,
+                )
+                logger.warning(
+                    "The project does not specify a build backend, and "
+                    "pip cannot fall back to setuptools without %s.",
+                    " and ".join(map(repr, sorted(missing)))
+                )
+            # Install any extra build dependencies that the backend requests.
+            # This must be done in a second pass, as the pyproject.toml
+            # dependencies must be installed before we can call the backend.
+            with self.req.build_env:
+                # We need to have the env active when calling the hook.
+                self.req.spin_message = "Getting requirements to build wheel"
+                reqs = self.req.pep517_backend.get_requires_for_build_wheel()
+            conflicting, missing = self.req.build_env.check_requirements(reqs)
+            if conflicting:
+                _raise_conflicts("the backend dependencies", conflicting)
+            self.req.build_env.install_requirements(
+                finder, missing, 'normal',
+                "Installing backend dependencies"
+            )
+
+        self.req.prepare_metadata()
+        self.req.assert_source_matches_version()

lib/python3.8/site-packages/pip/_internal/distributions/wheel.py

@@ -0,0 +1,17 @@
+from pip._vendor import pkg_resources
+
+from pip._internal.distributions.base import AbstractDistribution
+
+
+class WheelDistribution(AbstractDistribution):
+    """Represents a wheel distribution.
+
+    This does not need any preparation as wheels can be directly unpacked.
+    """
+
+    def get_pkg_resources_distribution(self):
+        return list(pkg_resources.find_distributions(
+                    self.req.source_dir))[0]
+
+    def prepare_distribution_metadata(self, finder, build_isolation):
+        pass