Specify dev nodes list file for ramdisk partition generation

Ramdisk partition requires "-n" argument to be passed when generating
the image file. Given that the value is agnostic to the target product
and is set to a constant value, this is implicitly set internally in
filesystem module.

Test: inspect ramdisk.img build command
Bug: 379190521
Change-Id: I01d0c1bf06e087ab49c71bdb0cfe48a08b9c7fc9

1 files changed, 21 insertions, 0 deletions

diff --git a/filesystem/filesystem.go b/filesystem/filesystem.go
index c34677060..ba5319fb6 100644
--- a/filesystem/filesystem.go
+++ b/filesystem/filesystem.go
@@ -162,6 +162,10 @@ type FilesystemProperties struct {
 	// Determines if the module is auto-generated from Soong or not. If the module is
 	// auto-generated, its deps are exempted from visibility enforcement.
 	Is_auto_generated *bool
+
+	// Path to the dev nodes description file. This is only needed for building the ramdisk
+	// partition and should not be explicitly specified.
+	Dev_nodes_description_file *string `android:"path" blueprint:"mutated"`
 }
 
 // Additional properties required to generate erofs FS partitions.
@@ -210,6 +214,10 @@ func initFilesystemModule(module android.DefaultableModule, filesystemModule *fi
 	filesystemModule.PackagingBase.AllowHighPriorityDeps = true
 	android.InitAndroidMultiTargetsArchModule(module, android.DeviceSupported, android.MultilibCommon)
 	android.InitDefaultableModule(module)
+
+	android.AddLoadHook(module, func(ctx android.LoadHookContext) {
+		filesystemModule.setDevNodesDescriptionProp()
+	})
 }
 
 type depTag struct {
@@ -229,6 +237,16 @@ func (t depTagWithVisibilityEnforcementBypass) ExcludeFromVisibilityEnforcement(
 
 var dependencyTagWithVisibilityEnforcementBypass = depTagWithVisibilityEnforcementBypass{}
 
+// ramdiskDevNodesDescription is the name of the filegroup module that provides the file that
+// contains the description of dev nodes added to the CPIO archive for the ramdisk partition.
+const ramdiskDevNodesDescription = "ramdisk_node_list"
+
+func (f *filesystem) setDevNodesDescriptionProp() {
+	if proptools.String(f.properties.Partition_name) == "ramdisk" {
+		f.properties.Dev_nodes_description_file = proptools.StringPtr(":" + ramdiskDevNodesDescription)
+	}
+}
+
 func (f *filesystem) DepsMutator(ctx android.BottomUpMutatorContext) {
 	if proptools.Bool(f.properties.Is_auto_generated) {
 		f.AddDeps(ctx, dependencyTagWithVisibilityEnforcementBypass)
@@ -659,6 +677,9 @@ func (f *filesystem) buildCpioImage(ctx android.ModuleContext, compressed bool)
 	cmd := builder.Command().
 		BuiltTool("mkbootfs").
 		Text(rootDir.String()) // input directory
+	if nodeList := f.properties.Dev_nodes_description_file; nodeList != nil {
+		cmd.FlagWithInput("-n ", android.PathForModuleSrc(ctx, proptools.String(nodeList)))
+	}
 	if compressed {
 		cmd.Text("|").
 			BuiltTool("lz4").