[avb_footer] Add avb_gen_vbmeta_image to generate vbmeta image
This is the reland of the change aosp/2375848. The build of initrd on
linux-x86 that has incorrect format (b/264940248) is disabled in this
cl.
Bug: 260821553
Test: m microdroid_kernel_signed and inspect the output using `avbtool
info_image --image <output>`
Change-Id: I3ad2419b7132cde4b2fc34ddfa09ec5ba2166819
diff --git a/filesystem/avb_gen_vbmeta_image.go b/filesystem/avb_gen_vbmeta_image.go
new file mode 100644
index 0000000..0f331f9
--- /dev/null
+++ b/filesystem/avb_gen_vbmeta_image.go
@@ -0,0 +1,108 @@
+// Copyright (C) 2022 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.
+
+package filesystem
+
+import (
+ "fmt"
+
+ "github.com/google/blueprint/proptools"
+
+ "android/soong/android"
+)
+
+type avbGenVbmetaImage struct {
+ android.ModuleBase
+
+ properties avbGenVbmetaImageProperties
+
+ output android.OutputPath
+ installDir android.InstallPath
+}
+
+type avbGenVbmetaImageProperties struct {
+ // Source file of this image. Can reference a genrule type module with the ":module" syntax.
+ Src *string `android:"path,arch_variant"`
+
+ // Name of the image partition. Defaults to the name of this module.
+ Partition_name *string
+
+ // The salt in hex. Required for reproducible builds.
+ Salt *string
+}
+
+// The avbGenVbmetaImage generates an unsigned VBMeta image output for the given image.
+func avbGenVbmetaImageFactory() android.Module {
+ module := &avbGenVbmetaImage{}
+ module.AddProperties(&module.properties)
+ android.InitAndroidArchModule(module, android.DeviceSupported, android.MultilibFirst)
+ return module
+}
+
+func (a *avbGenVbmetaImage) installFileName() string {
+ return a.Name() + ".img"
+}
+
+func (a *avbGenVbmetaImage) GenerateAndroidBuildActions(ctx android.ModuleContext) {
+ builder := android.NewRuleBuilder(pctx, ctx)
+ cmd := builder.Command().BuiltTool("avbtool").Text("add_hash_footer")
+ cmd.Flag("--dynamic_partition_size")
+ cmd.Flag("--do_not_append_vbmeta_image")
+
+ partition_name := proptools.StringDefault(a.properties.Partition_name, a.Name())
+ cmd.FlagWithArg("--partition_name ", partition_name)
+
+ if a.properties.Src == nil {
+ ctx.PropertyErrorf("src", "missing source file")
+ return
+ }
+ input := android.PathForModuleSrc(ctx, proptools.String(a.properties.Src))
+ cmd.FlagWithInput("--image ", input)
+
+ if a.properties.Salt == nil {
+ ctx.PropertyErrorf("salt", "missing salt value")
+ return
+ }
+ cmd.FlagWithArg("--salt ", proptools.String(a.properties.Salt))
+
+ a.output = android.PathForModuleOut(ctx, a.installFileName()).OutputPath
+ cmd.FlagWithOutput("--output_vbmeta_image ", a.output)
+ builder.Build("avbGenVbmetaImage", fmt.Sprintf("avbGenVbmetaImage %s", ctx.ModuleName()))
+}
+
+var _ android.AndroidMkEntriesProvider = (*avbGenVbmetaImage)(nil)
+
+// Implements android.AndroidMkEntriesProvider
+func (a *avbGenVbmetaImage) AndroidMkEntries() []android.AndroidMkEntries {
+ return []android.AndroidMkEntries{android.AndroidMkEntries{
+ Class: "ETC",
+ OutputFile: android.OptionalPathForPath(a.output),
+ ExtraEntries: []android.AndroidMkExtraEntriesFunc{
+ func(ctx android.AndroidMkExtraEntriesContext, entries *android.AndroidMkEntries) {
+ entries.SetString("LOCAL_MODULE_PATH", a.installDir.String())
+ entries.SetString("LOCAL_INSTALLED_MODULE_STEM", a.installFileName())
+ },
+ },
+ }}
+}
+
+var _ android.OutputFileProducer = (*avbGenVbmetaImage)(nil)
+
+// Implements android.OutputFileProducer
+func (a *avbGenVbmetaImage) OutputFiles(tag string) (android.Paths, error) {
+ if tag == "" {
+ return []android.Path{a.output}, nil
+ }
+ return nil, fmt.Errorf("unsupported module reference tag %q", tag)
+}