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// Copyright 2015 Google Inc. 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.
package android
import (
"android/soong/env"
"github.com/google/blueprint"
)
// This file supports dependencies on environment variables. During build manifest generation,
// any dependency on an environment variable is added to a list. During the singleton phase
// a JSON file is written containing the current value of all used environment variables.
// The next time the top-level build script is run, it uses the soong_env executable to
// compare the contents of the environment variables, rewriting the file if necessary to cause
// a manifest regeneration.
func EnvSingleton() blueprint.Singleton {
return &envSingleton{}
}
type envSingleton struct{}
func (c *envSingleton) GenerateBuildActions(ctx blueprint.SingletonContext) {
envDeps := ctx.Config().(Config).EnvDeps()
envFile := PathForOutput(ctx, ".soong.environment")
if ctx.Failed() {
return
}
err := env.WriteEnvFile(envFile.String(), envDeps)
if err != nil {
ctx.Errorf(err.Error())
}
ctx.AddNinjaFileDeps(envFile.String())
}
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