| # Copyright 2019 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. |
| |
| """A platform-independent build rule that merges license files.""" |
| |
| def _windows_action(ctx, files): |
| cmd = "(FOR %F IN (%SRCS%) DO ((SET X=%F)&ECHO ===== !X:\\=/! =====&TYPE %F&ECHO.&ECHO.)) > %OUT%" |
| ctx.actions.run( |
| inputs = depset(direct = files), |
| outputs = [ctx.outputs.out], |
| executable = "cmd.exe", |
| arguments = ["/V:ON", "/E:ON", "/Q", "/C", cmd], |
| env = { |
| "OUT": ctx.outputs.out.path.replace("/", "\\"), |
| "SRCS": " ".join([f.path.replace("/", "\\") for f in files]), |
| }, |
| ) |
| |
| def _bash_action(ctx, files): |
| cmd = "for f in $SRCS; do echo ===== $f ===== && cat $f && echo && echo ; done > $OUT" |
| ctx.actions.run_shell( |
| inputs = depset(direct = files), |
| outputs = [ctx.outputs.out], |
| command = cmd, |
| env = { |
| "OUT": ctx.outputs.out.path, |
| "SRCS": " ".join([f.path for f in files]), |
| }, |
| ) |
| |
| def _impl(ctx): |
| files = [] |
| for src in ctx.files.srcs: |
| for substr in ["ASSEMBLY_EXCEPTION", "DISCLAIMER", "LICENSE", "license", "THIRD_PARTY_README"]: |
| if substr in src.path: |
| files.append(src) |
| break |
| if not files: |
| fail("expected some sources") |
| if ctx.attr.is_windows: |
| _windows_action(ctx, files) |
| else: |
| _bash_action(ctx, files) |
| |
| return [DefaultInfo(files = depset(direct = [ctx.outputs.out]))] |
| |
| _merge_licenses = rule( |
| implementation = _impl, |
| attrs = { |
| "srcs": attr.label_list(allow_files = True, mandatory = True), |
| "out": attr.output(mandatory = True), |
| "is_windows": attr.bool(mandatory = True), |
| }, |
| ) |
| |
| def merge_licenses(name, srcs, out, **kwargs): |
| _merge_licenses( |
| name = name, |
| srcs = srcs, |
| out = out, |
| is_windows = select({ |
| "@bazel_tools//src/conditions:windows": True, |
| "//conditions:default": False, |
| }), |
| **kwargs |
| ) |