gn/gen_perfetto_version_header.gni

# Copyright (C) 2020 The Android Open Source Project
#
# 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.

# This action generates a perfetto_version.gen.h which exposes some
# PERFETTO_VERSION_xxx() macros that contains the git revision and release
# number from the CHANGELOG.
# This template is used only in two places: in //base (for C++ code) and in
# //ui. This teamplate exists only to keep the logic consistent and avoid that
# base's and ui's logic diverge.

import("perfetto.gni")

_ver_script = "${perfetto_root_path}tools/write_version_header.py"
_has_git = false
if (perfetto_enable_git_rev_version_header) {
  _has_git = "1" == exec_script(_ver_script, [ "--check_git" ], "trim string")
}

template("gen_perfetto_version_header") {
  action(target_name) {
    script = _ver_script
    changelog = "${perfetto_root_path}CHANGELOG"
    inputs = [ changelog ]
    outputs = []
    args = []
    if (_has_git) {
      inputs += [ "${perfetto_root_path}.git/HEAD" ]
    }

    if (defined(invoker.cpp_out)) {
      args += [
        "--changelog",
        rebase_path(changelog, root_build_dir),
        "--cpp_out",
        rebase_path(invoker.cpp_out, root_build_dir),
      ]
      outputs += [ invoker.cpp_out ]
    }
    if (defined(invoker.ts_out)) {
      args += [
        "--ts_out",
        rebase_path(invoker.ts_out, root_build_dir),
      ]
      outputs += [ invoker.ts_out ]
    }
    if (!_has_git) {
      args += [ "--no_git" ]
    }
  }
}