python_packages.bzl

_py2_from_source_build_file_content = """
exports_files(["python_bin"])
filegroup(
    name = "files",
    srcs = glob(["bazel_install_py2/**"], exclude = ["**/* *"]),
    visibility = ["//visibility:public"],
)
"""

_py2_configure = """
./configure --prefix=$(pwd)/bazel_install_py2
"""

_py2_configure_darwin = """
./configure --prefix=$(pwd)/bazel_install_py2 --with-openssl=$(brew --prefix openssl)
"""

def _py2_patch_cmds(configure):
    return [
        "mkdir $(pwd)/bazel_install_py2",
        configure,
        "make -j",
        "make install",
        "ln -s bazel_install_py2/bin/python python_bin",
    ]

_py3_from_source_build_file_content = """
exports_files(["python3_bin"])
filegroup(
    name = "files",
    srcs = glob(["bazel_install_py3/**"], exclude = ["**/* *"]),
    visibility = ["//visibility:public"],
)
"""

_py3_configure = """
./configure --prefix=$(pwd)/bazel_install_py3
"""

_py3_configure_darwin = """
./configure --prefix=$(pwd)/bazel_install_py3 --with-openssl=$(brew --prefix openssl)
"""

def _py3_patch_cmds(configure):
    return [
        "mkdir $(pwd)/bazel_install_py3",
        configure,
        "make -j",
        "make install",
        "ln -s bazel_install_py3/bin/python3 python3_bin",
    ]

PYTHON_PACKAGES = dict({
    "darwin_amd64": struct(
        python2 = struct(
            sha256 = "da3080e3b488f648a3d7a4560ddee895284c3380b11d6de75edb986526b9a814",
            urls = [
                "https://www.python.org/ftp/python/2.7.18/Python-2.7.18.tgz",
            ],
            build_file_content = _py2_from_source_build_file_content,
            patch_cmds = _py2_patch_cmds(_py2_configure_darwin),
            strip_prefix = "Python-2.7.18",
            python_interpreter = "python_bin",
        ),
        python3 = struct(
            sha256 = "fb1a1114ebfe9e97199603c6083e20b236a0e007a2c51f29283ffb50c1420fb2",
            urls = [
                "https://www.python.org/ftp/python/3.8.11/Python-3.8.11.tar.xz",
            ],
            build_file_content = _py3_from_source_build_file_content,
            patch_cmds = _py3_patch_cmds(_py3_configure_darwin),
            strip_prefix = "Python-3.8.11",
            python_interpreter = "python3_bin",
        ),
        exec_compatible_with = [
            "@platforms//os:macos",
            "@platforms//cpu:x86_64",
        ],
    ),
    "linux_amd64": struct(
        python2 = struct(
            sha256 = "da3080e3b488f648a3d7a4560ddee895284c3380b11d6de75edb986526b9a814",
            urls = [
                "https://www.python.org/ftp/python/2.7.18/Python-2.7.18.tgz",
            ],
            build_file_content = _py2_from_source_build_file_content,
            patch_cmds = _py2_patch_cmds(_py2_configure),
            strip_prefix = "Python-2.7.18",
            python_interpreter = "python_bin",
        ),
        python3 = struct(
            sha256 = "fb1a1114ebfe9e97199603c6083e20b236a0e007a2c51f29283ffb50c1420fb2",
            urls = [
                "https://www.python.org/ftp/python/3.8.11/Python-3.8.11.tar.xz",
            ],
            build_file_content = _py3_from_source_build_file_content,
            patch_cmds = _py3_patch_cmds(_py3_configure),
            strip_prefix = "Python-3.8.11",
            python_interpreter = "python3_bin",
        ),
        exec_compatible_with = [
            "@platforms//os:linux",
            "@platforms//cpu:x86_64",
        ],
    ),
    "windows_amd64": struct(
        # There is no easy install candidate for python2. There is an installer
        # that would install python somewhere on the system, but that is not
        # hermetic. There is also source code, but that requires a cc toolchain.
        python3 = struct(
            sha256 = "abbe314e9b41603dde0a823b76f5bbbe17b3de3e5ac4ef06b759da5466711271",
            urls = [
                "https://www.python.org/ftp/python/3.8.10/python-3.8.10-embed-amd64.zip",
            ],
            build_file_content = """
exports_files(["python.exe"])
filegroup(
    name = "files",
    srcs = glob(["**/*"]),
    visibility = ["//visibility:public"],
)
""",
            # Remove python38._pth to make sys.path behave normally. Otherwise,
            # packages from rules_python do not appear in sys.path.
            # https://stackoverflow.com/questions/44443254/python-embeddable-zip-file-doesnt-include-lib-site-packages-in-sys-path
            patch_cmds = [
                "rm python38._pth",
            ],
            strip_prefix = "",
            # This can not be a symlink or a Bazel alias. It must point to the
            # actual interpreter binary.
            python_interpreter = "python.exe",
        ),
        exec_compatible_with = [
            "@platforms//os:windows",
            "@platforms//cpu:x86_64",
        ],
    ),
})