1// Copyright (C) 2021 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
15package filesystem
16
17import (
18	"android/soong/android"
19	"android/soong/linkerconfig"
20)
21
22type systemImage struct {
23	filesystem
24
25	properties systemImageProperties
26}
27
28type systemImageProperties struct {
29	// Path to the input linker config json file.
30	Linker_config_src *string
31}
32
33// android_system_image is a specialization of android_filesystem for the 'system' partition.
34// Currently, the only difference is the inclusion of linker.config.pb file which specifies
35// the provided and the required libraries to and from APEXes.
36func systemImageFactory() android.Module {
37	module := &systemImage{}
38	module.AddProperties(&module.properties)
39	module.filesystem.buildExtraFiles = module.buildExtraFiles
40	initFilesystemModule(&module.filesystem)
41	return module
42}
43
44func (s *systemImage) buildExtraFiles(ctx android.ModuleContext, root android.OutputPath) android.OutputPaths {
45	lc := s.buildLinkerConfigFile(ctx, root)
46	// Add more files if needed
47	return []android.OutputPath{lc}
48}
49
50func (s *systemImage) buildLinkerConfigFile(ctx android.ModuleContext, root android.OutputPath) android.OutputPath {
51	input := android.PathForModuleSrc(ctx, android.String(s.properties.Linker_config_src))
52	output := root.Join(ctx, "system", "etc", "linker.config.pb")
53
54	// we need "Module"s for packaging items
55	var otherModules []android.Module
56	deps := s.GatherPackagingSpecs(ctx)
57	ctx.WalkDeps(func(child, parent android.Module) bool {
58		for _, ps := range child.PackagingSpecs() {
59			if _, ok := deps[ps.RelPathInPackage()]; ok {
60				otherModules = append(otherModules, child)
61			}
62		}
63		return true
64	})
65
66	builder := android.NewRuleBuilder(pctx, ctx)
67	linkerconfig.BuildLinkerConfig(ctx, builder, input, otherModules, output)
68	builder.Build("conv_linker_config", "Generate linker config protobuf "+output.String())
69	return output
70}
71