add android_filesystem
android_filesystem is a module type that can be used to create filesystem
images out of binaries built for Android. Its initial use will be for
creating an Android-like OS image to run on virtual machines, but the
use is not limited to it.
The module type currently lacks a lot of features like the support for
other filesystem types, and the ability to do something like signing the
image using avbtool, etc. Those will be added in follow-up CLs as we
have actual demands.
Bug: 172414391
Test: m
Change-Id: I4b779d4586e04d9a960688e73b711166708558ab
diff --git a/filesystem/filesystem.go b/filesystem/filesystem.go
new file mode 100644
index 0000000..a1605b4
--- /dev/null
+++ b/filesystem/filesystem.go
@@ -0,0 +1,76 @@
+// Copyright (C) 2020 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"
+
+ "android/soong/android"
+)
+
+func init() {
+ android.RegisterModuleType("android_filesystem", filesystemFactory)
+}
+
+type filesystem struct {
+ android.ModuleBase
+ android.PackagingBase
+}
+
+func filesystemFactory() android.Module {
+ module := &filesystem{}
+ android.InitPackageModule(module)
+ android.InitAndroidMultiTargetsArchModule(module, android.DeviceSupported, android.MultilibCommon)
+ return module
+}
+
+func (f *filesystem) DepsMutator(ctx android.BottomUpMutatorContext) {
+ f.AddDeps(ctx)
+}
+
+var pctx = android.NewPackageContext("android/soong/filesystem")
+
+func (f *filesystem) GenerateAndroidBuildActions(ctx android.ModuleContext) {
+ zipFile := android.PathForModuleOut(ctx, "temp.zip").OutputPath
+ f.CopyDepsToZip(ctx, zipFile)
+
+ rootDir := android.PathForModuleOut(ctx, "root").OutputPath
+ builder := android.NewRuleBuilder()
+ builder.Command().
+ BuiltTool(ctx, "zipsync").
+ FlagWithArg("-d ", rootDir.String()). // zipsync wipes this. No need to clear.
+ Input(zipFile)
+
+ mkuserimg := ctx.Config().HostToolPath(ctx, "mkuserimg_mke2fs")
+ propFile := android.PathForModuleOut(ctx, "prop").OutputPath
+ // TODO(jiyong): support more filesystem types other than ext4
+ propsText := fmt.Sprintf(`mount_point=system\n`+
+ `fs_type=ext4\n`+
+ `use_dynamic_partition_size=true\n`+
+ `ext_mkuserimg=%s\n`, mkuserimg.String())
+ builder.Command().Text("echo").Flag("-e").Flag(`"` + propsText + `"`).
+ Text(">").Output(propFile).
+ Implicit(mkuserimg)
+
+ image := android.PathForModuleOut(ctx, "filesystem.img").OutputPath
+ builder.Command().BuiltTool(ctx, "build_image").
+ Text(rootDir.String()). // input directory
+ Input(propFile).
+ Output(image).
+ Text(rootDir.String()) // directory where to find fs_config_files|dirs
+
+ // rootDir is not deleted. Might be useful for quick inspection.
+ builder.Build(pctx, ctx, "build_filesystem_image", fmt.Sprintf("Creating filesystem %s", f.BaseModuleName()))
+}