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1# Copyright 2021 The Pigweed Authors
2#
3# Licensed under the Apache License, Version 2.0 (the "License"); you may not
4# use this file except in compliance with the License. You may obtain a copy of
5# the License at
6#
7#     https://www.apache.org/licenses/LICENSE-2.0
8#
9# Unless required by applicable law or agreed to in writing, software
10# distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
11# WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
12# License for the specific language governing permissions and limitations under
13# the License.
14"""Configure Pigweed's backend implementations."""
15
16def _pigweed_config_impl(repository_ctx):
17    if repository_ctx.attr.build_file_content and \
18       repository_ctx.attr.build_file:
19        fail("Attributes 'build_file_content' and 'build_file' cannot both be \
20        defined at the same time.")
21    if not repository_ctx.attr.build_file_content and \
22       not repository_ctx.attr.build_file:
23        fail("Either 'build_file_content' or 'build_file' must be defined.")
24
25    if repository_ctx.name != "pigweed_config":
26        fail("This repository should be name 'pigweed_config'")
27
28    if repository_ctx.attr.build_file_content:
29        repository_ctx.file("BUILD", repository_ctx.attr.build_file_content)
30
31    if repository_ctx.attr.build_file:
32        repository_ctx.template("BUILD", repository_ctx.attr.build_file, {})
33
34pigweed_config = repository_rule(
35    _pigweed_config_impl,
36    attrs = {
37        "build_file_content": attr.string(
38            doc = "The build file content to configure Pigweed.",
39            mandatory = False,
40            default = "",
41        ),
42        "build_file": attr.label(
43            doc = "The label for the Pigweed config build file to use.",
44            mandatory = False,
45            default = "@pigweed//targets/host:host_config.BUILD",
46        ),
47    },
48    doc = """
49Configure Pigweeds backend implementations.
50
51Example:
52    # WORKSPACE
53    pigweed_config(
54        # This must use the exact name specified here otherwise this
55        # remote repository will not function as expected.
56        name = "pigweed_config",
57        build_file = "//path/to/config.BUILD",
58    )
59""",
60)
61