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# Copyright 2023 The Bazel Authors. All rights reserved.
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
# http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.
"""Public entry point for current_py_toolchain rule."""
def _current_py_toolchain_impl(ctx):
toolchain = ctx.toolchains[ctx.attr._toolchain]
direct = []
transitive = []
vars = {}
if toolchain.py3_runtime and toolchain.py3_runtime.interpreter:
direct.append(toolchain.py3_runtime.interpreter)
transitive.append(toolchain.py3_runtime.files)
vars["PYTHON3"] = toolchain.py3_runtime.interpreter.path
if toolchain.py2_runtime and toolchain.py2_runtime.interpreter:
direct.append(toolchain.py2_runtime.interpreter)
transitive.append(toolchain.py2_runtime.files)
vars["PYTHON2"] = toolchain.py2_runtime.interpreter.path
files = depset(direct, transitive = transitive)
return [
toolchain,
platform_common.TemplateVariableInfo(vars),
DefaultInfo(
runfiles = ctx.runfiles(transitive_files = files),
files = files,
),
]
current_py_toolchain = rule(
doc = """
This rule exists so that the current python toolchain can be used in the `toolchains` attribute of
other rules, such as genrule. It allows exposing a python toolchain after toolchain resolution has
happened, to a rule which expects a concrete implementation of a toolchain, rather than a
toolchain_type which could be resolved to that toolchain.
""",
implementation = _current_py_toolchain_impl,
attrs = {
"_toolchain": attr.string(default = str(Label("@bazel_tools//tools/python:toolchain_type"))),
},
toolchains = [
str(Label("@bazel_tools//tools/python:toolchain_type")),
],
)
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