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      1 // Copyright (C) 2019 The Android Open Source Project
      2 //
      3 // Licensed under the Apache License, Version 2.0 (the "License");
      4 // you may not use this file except in compliance with the License.
      5 // You may obtain a copy of the License at
      6 //
      7 //      http://www.apache.org/licenses/LICENSE-2.0
      8 //
      9 // Unless required by applicable law or agreed to in writing, software
     10 // distributed under the License is distributed on an "AS IS" BASIS,
     11 // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
     12 // See the License for the specific language governing permissions and
     13 // limitations under the License.
     14 
     15 package fs_config
     16 
     17 import (
     18 	"android/soong/android"
     19 )
     20 
     21 var pctx = android.NewPackageContext("android/soong/fs_config")
     22 
     23 func init() {
     24 	android.RegisterModuleType("target_fs_config_gen_filegroup", targetFSConfigGenFactory)
     25 }
     26 
     27 // target_fs_config_gen_filegroup is used to expose the files pointed to by TARGET_FS_CONFIG_GEN to
     28 // genrules in Soong. If TARGET_FS_CONFIG_GEN is empty, it will export an empty file instead.
     29 func targetFSConfigGenFactory() android.Module {
     30 	module := &targetFSConfigGen{}
     31 	android.InitAndroidModule(module)
     32 	return module
     33 }
     34 
     35 var _ android.SourceFileProducer = (*targetFSConfigGen)(nil)
     36 
     37 type targetFSConfigGen struct {
     38 	android.ModuleBase
     39 	paths android.Paths
     40 }
     41 
     42 func (targetFSConfigGen) DepsMutator(ctx android.BottomUpMutatorContext) {}
     43 
     44 func (t *targetFSConfigGen) GenerateAndroidBuildActions(ctx android.ModuleContext) {
     45 	if ret := ctx.DeviceConfig().TargetFSConfigGen(); len(ret) != 0 {
     46 		t.paths = android.PathsForSource(ctx, ret)
     47 	} else {
     48 		path := android.PathForModuleGen(ctx, "empty")
     49 		t.paths = android.Paths{path}
     50 
     51 		rule := android.NewRuleBuilder()
     52 		rule.Command().Text("rm -rf").Output(path)
     53 		rule.Command().Text("touch").Output(path)
     54 		rule.Build(pctx, ctx, "fs_config_empty", "create empty file")
     55 	}
     56 }
     57 
     58 func (t *targetFSConfigGen) Srcs() android.Paths {
     59 	return t.paths
     60 }
     61