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# Copyright 2017 The Bazel Go Rules 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.
def _impl(ctx):
exe = ctx.outputs.out
ctx.actions.write(
output = exe,
# The file must not be empty because running an empty .bat file as a
# subprocess fails on Windows, so we write one space to it.
content = " ",
is_executable = True,
)
return [DefaultInfo(files = depset([exe]), executable = exe)]
_single_output_test = rule(
implementation = _impl,
attrs = {
"dep": attr.label(allow_single_file = True),
"out": attr.output(),
},
test = True,
)
def single_output_test(name, dep, **kwargs):
"""Checks that a dependency produces a single output file.
This test works by setting `allow_single_file = True` on the `dep` attribute.
If `dep` provides zero or multiple files in its `files` provider, Bazel will
fail to build this rule during analysis. The actual test does nothing.
Args:
name: The name of the test rule.
dep: a label for the rule to check.
**kwargs: The <a href="https://docs.bazel.build/versions/master/be/common-definitions.html#common-attributes-tests">common attributes for tests</a>.
"""
_single_output_test(
name = name,
dep = dep,
# On Windows we need the ".bat" extension.
# On other platforms the extension doesn't matter.
# Therefore we can use ".bat" on every platform.
out = name + ".bat",
**kwargs
)
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