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# Copyright 2020 The gRPC authors.
#
# 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 _generate_copied_files_impl(ctx):
srcs = ctx.attr.srcs[0]
strip_prefix = ctx.attr.strip_prefix
dest = ctx.attr.dest
outs = []
for f in srcs.files.to_list():
destination_path = f.path
if f.path.startswith("external"):
external_separator = f.path.find("/")
repository_separator = f.path.find("/", external_separator + 1)
destination_path = f.path[repository_separator + 1:]
if not destination_path.startswith(strip_prefix):
fail("File '{}' did not start with '{}'.".format(
destination_path,
strip_prefix,
))
destination_path = dest + destination_path[len(strip_prefix):]
destination_dir = destination_path.rfind("/")
out_file = ctx.actions.declare_file(destination_path)
outs.append(out_file)
ctx.actions.run_shell(
inputs = [f],
outputs = [out_file],
command = "mkdir -p {0} && cp {1} {2}".format(
out_file.dirname,
f.path,
out_file.path,
),
)
return [DefaultInfo(files = depset(direct = outs))]
_generate_copied_files = rule(
attrs = {
"srcs": attr.label_list(
mandatory = True,
allow_empty = False,
),
"strip_prefix": attr.string(
default = "",
),
"dest": attr.string(
mandatory = True,
),
},
implementation = _generate_copied_files_impl,
)
def internal_copied_filegroup(name, srcs, strip_prefix, dest):
"""Copies a file group to the current package.
Useful for using an existing filegroup as a data dependency.
Args:
name: The name of the rule.
srcs: A single filegroup.
strip_prefix: An optional string to strip from the beginning
of the path of each file in the filegroup. Must end in a slash.
dest: The directory in which to put the files, relative to the
current package. Must end in a slash.
"""
if len(srcs) != 1:
fail("srcs must be a single filegroup.")
if not dest.endswith("/"):
fail("dest must end with a '/' character.")
_symlink_target = name + "_symlink"
_generate_copied_files(
name = _symlink_target,
srcs = srcs,
strip_prefix = strip_prefix,
dest = dest,
)
native.filegroup(
name = name,
srcs = [":" + _symlink_target],
)
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