python3: Split pip into separate source package

Packaging pip from a separate source package allows it to stay updated
with upstream.

Host pip will remain installed as part of python3. Host pip is used in a
much more controlled way and so is less critical for it to track
upstream.

This also removes the python-pip-conf package and installs the pip.conf
file as part of python3-pip.

The patch 003-disable-pip-version-check.patch is originally from Debian:
bb079efb8c/debian/patches/disable-pip-version-check.patch

pip was in a separate source package that was removed in
a53d0c5a403d1669e2cf6c59c2be6a9d3ed633a0; this work is not based on that
earlier package.

Signed-off-by: Jeffery To <jeffery.to@gmail.com>
(cherry picked from commit eee273507b)

lang/python/python-pip/Makefile

@@ -0,0 +1,56 @@
+#
+# Copyright (C) 2023 Jeffery To
+#
+# This is free software, licensed under the GNU General Public License v2.
+# See /LICENSE for more information.
+#
+
+include $(TOPDIR)/rules.mk
+
+PKG_NAME:=python-pip
+PKG_VERSION:=23.1.2
+PKG_RELEASE:=1
+
+PYPI_NAME:=pip
+PKG_HASH:=0e7c86f486935893c708287b30bd050a36ac827ec7fe5e43fe7cb198dd835fba
+
+PKG_LICENSE:=MIT
+PKG_LICENSE_FILES:=LICENSE.txt
+PKG_MAINTAINER:=Jeffery To <jeffery.to@gmail.com>
+CPE_ID:=cpe:/a:python:pip
+
+include ../pypi.mk
+include $(INCLUDE_DIR)/package.mk
+include ../python3-package.mk
+
+define Package/python3-pip
+  SECTION:=lang
+  CATEGORY:=Languages
+  SUBMENU:=Python
+  TITLE:=PyPA recommended tool for installing Python packages
+  URL:=https://pip.pypa.io/
+  DEPENDS:=+python3
+endef
+
+define Package/python3-pip/description
+pip is the package installer for Python. You can use pip to install
+packages from the Python Package Index and other indexes.
+endef
+
+define Package/python3-pip/conffiles
+/etc/pip.conf
+endef
+
+define Py3Package/python3-pip/install
+	$(INSTALL_DIR) $(1)/usr/bin
+	$(INSTALL_BIN) $(PKG_INSTALL_DIR)/usr/bin/pip$(PYTHON3_VERSION) $(1)/usr/bin/
+	$(LN) pip$(PYTHON3_VERSION) $(1)/usr/bin/pip3
+	$(LN) pip$(PYTHON3_VERSION) $(1)/usr/bin/pip
+
+	$(INSTALL_DIR) $(1)/etc
+	$(INSTALL_DATA) ./files/pip.conf $(1)/etc/
+endef
+
+$(eval $(call Py3Package,python3-pip))
+$(eval $(call BuildPackage,python3-pip))
+$(eval $(call BuildPackage,python3-pip-src))

lang/python/python-pip/files/pip.conf

@@ -0,0 +1,2 @@
+[global]
+cache-dir = /var/cache/pip

lang/python/python-pip/patches/001-pyproject-hooks-pyc-fix.patch

@@ -0,0 +1,13 @@
+--- a/src/pip/_vendor/pyproject_hooks/_in_process/__init__.py
++++ b/src/pip/_vendor/pyproject_hooks/_in_process/__init__.py
+@@ -11,8 +11,8 @@ try:
+ except AttributeError:
+     # Python 3.8 compatibility
+     def _in_proc_script_path():
+-        return resources.path(__package__, '_in_process.py')
++        return resources.path(__package__, '_in_process.pyc')
+ else:
+     def _in_proc_script_path():
+         return resources.as_file(
+-            resources.files(__package__).joinpath('_in_process.py'))
++            resources.files(__package__).joinpath('_in_process.pyc'))

lang/python/python-pip/patches/002-pip-runner-pyc-fix.patch

@@ -0,0 +1,11 @@
+--- a/src/pip/_internal/build_env.py
++++ b/src/pip/_internal/build_env.py
+@@ -54,7 +54,7 @@ def get_runnable_pip() -> str:
+         # case, we can use that directly.
+         return str(source)
+ 
+-    return os.fsdecode(source / "__pip-runner__.py")
++    return os.fsdecode(source / "__pip-runner__.pyc")
+ 
+ 
+ def _get_system_sitepackages() -> Set[str]:

lang/python/python-pip/patches/003-disable-pip-version-check.patch

@@ -0,0 +1,20 @@
+From: Barry Warsaw <barry@python.org>
+Date: Fri, 18 Nov 2016 17:07:47 -0500
+Subject: Set --disable-pip-version-check=True by default.
+
+Patch-Name: disable-pip-version-check.patch
+---
+ src/pip/_internal/cli/cmdoptions.py | 2 +-
+ 1 file changed, 1 insertion(+), 1 deletion(-)
+
+--- a/src/pip/_internal/cli/cmdoptions.py
++++ b/src/pip/_internal/cli/cmdoptions.py
+@@ -892,7 +892,7 @@ disable_pip_version_check: Callable[...,
+     "--disable-pip-version-check",
+     dest="disable_pip_version_check",
+     action="store_true",
+-    default=False,
++    default=True,
+     help="Don't periodically check PyPI to determine whether a new version "
+     "of pip is available for download. Implied with --no-index.",
+ )