Add vbmeta module type

The module type is to create vbmeta image out of other partitions.

Bug: 180676957
Test: m microdroid_vbmeta microdroid_vbmeta_system
Inspect the built image using `avbtool info_image --image <image>`

Change-Id: Iac92e9ab1640dcd488af69842e09850a91262bf1

1 files changed, 11 insertions, 0 deletions

diff --git a/filesystem/filesystem.go b/filesystem/filesystem.go
index 7f36308df..8974eba4f 100644
--- a/filesystem/filesystem.go
+++ b/filesystem/filesystem.go
@@ -385,6 +385,10 @@ func (f *filesystem) OutputFiles(tag string) (android.Paths, error) {
 type Filesystem interface {
 	android.Module
 	OutputPath() android.Path
+
+	// Returns the output file that is signed by avbtool. If this module is not signed, returns
+	// nil.
+	SignedOutputPath() android.Path
 }
 
 var _ Filesystem = (*filesystem)(nil)
@@ -392,3 +396,10 @@ var _ Filesystem = (*filesystem)(nil)
 func (f *filesystem) OutputPath() android.Path {
 	return f.output
 }
+
+func (f *filesystem) SignedOutputPath() android.Path {
+	if proptools.Bool(f.properties.Use_avb) {
+		return f.OutputPath()
+	}
+	return nil
+}