Switch to a dedicated tool for vendoring pip's dependencies

news/4785.process

@@ -0,0 +1 @@
+Switch to a dedicated CLI tool for vendoring dependencies.

pyproject.toml

@@ -18,3 +18,42 @@ type = [
   { name = "Improved Documentation",    directory = "doc",     showcontent = true },
   { name = "Trivial Changes",           directory = "trivial", showcontent = false },
 ]
+
+[tool.vendoring]
+destination = "src/pip/_vendor/"
+requirements = "src/pip/_vendor/vendor.txt"
+namespace = "pip._vendor"
+
+protected-files = ["__init__.py", "README.rst", "vendor.txt"]
+patches-dir = "tools/automation/vendoring/patches"
+
+[tool.vendoring.transformations]
+substitute = [
+  # pkg_resource's vendored packages are directly vendored in pip.
+  { match='pkg_resources\.extern', replace='pip._vendor' },
+  { match='from \.extern', replace='from pip._vendor' },
+]
+drop = [
+  # contains unnecessary scripts
+  "bin/",
+  # interpreter and OS specific msgpack libs
+  "msgpack/*.so",
+  # unneeded parts of setuptools
+  "easy_install.py",
+  "setuptools",
+  "pkg_resources/_vendor/",
+  "pkg_resources/extern/",
+]
+
+[tool.vendoring.typing-stubs]
+six = ["six.__init__", "six.moves.__init__", "six.moves.configparser"]
+appdirs = []
+contextlib2 = []
+
+[tool.vendoring.license.directories]
+setuptools = "pkg_resources"
+msgpack-python = "msgpack"
+
+[tool.vendoring.license.fallback-urls]
+pytoml = "https://github.com/avakar/pytoml/raw/master/LICENSE"
+webencodings = "https://github.com/SimonSapin/python-webencodings/raw/master/LICENSE"