Add build_prop soong module
build_prop is a soong module generating {partition}/build.prop. It's
ported from build/make/core/sysprop.mk and will replace sysprop.mk in
the future. Currently used only by Android.bp cuttlefish system image.
Bug: 322090587
Bug: 346214958
Test: compare system/build.prop and aosp_cf_x86_64_system-build.prop for
eng / user / userdebug
Change-Id: Iad76139fe86ec4f582218c185aa15baeacaa38dc
diff --git a/android/build_prop.go b/android/build_prop.go
new file mode 100644
index 0000000..45c17c3
--- /dev/null
+++ b/android/build_prop.go
@@ -0,0 +1,125 @@
+// Copyright 2024 Google Inc. All rights reserved.
+//
+// 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 android
+
+import (
+ "github.com/google/blueprint/proptools"
+)
+
+func init() {
+ ctx := InitRegistrationContext
+ ctx.RegisterModuleType("build_prop", buildPropFactory)
+}
+
+type buildPropProperties struct {
+ // Output file name. Defaults to "build.prop"
+ Stem *string
+
+ // List of prop names to exclude. This affects not only common build properties but also
+ // properties in prop_files.
+ Block_list []string
+
+ // Path to the input prop files. The contents of the files are directly
+ // emitted to the output
+ Prop_files []string `android:"path"`
+
+ // Files to be appended at the end of build.prop. These files are appended after
+ // post_process_props without any further checking.
+ Footer_files []string `android:"path"`
+
+ // Path to a JSON file containing product configs.
+ Product_config *string `android:"path"`
+}
+
+type buildPropModule struct {
+ ModuleBase
+
+ properties buildPropProperties
+
+ outputFilePath OutputPath
+ installPath InstallPath
+}
+
+func (p *buildPropModule) stem() string {
+ return proptools.StringDefault(p.properties.Stem, "build.prop")
+}
+
+func (p *buildPropModule) GenerateAndroidBuildActions(ctx ModuleContext) {
+ p.outputFilePath = PathForModuleOut(ctx, "build.prop").OutputPath
+ if !ctx.Config().KatiEnabled() {
+ WriteFileRule(ctx, p.outputFilePath, "# no build.prop if kati is disabled")
+ return
+ }
+
+ partition := p.PartitionTag(ctx.DeviceConfig())
+ if partition != "system" {
+ ctx.PropertyErrorf("partition", "unsupported partition %q: only \"system\" is supported", partition)
+ return
+ }
+
+ rule := NewRuleBuilder(pctx, ctx)
+
+ config := ctx.Config()
+
+ cmd := rule.Command().BuiltTool("gen_build_prop")
+
+ cmd.FlagWithInput("--build-hostname-file=", config.BuildHostnameFile(ctx))
+ cmd.FlagWithInput("--build-number-file=", config.BuildNumberFile(ctx))
+ // shouldn't depend on BuildFingerprintFile and BuildThumbprintFile to prevent from rebuilding
+ // on every incremental build.
+ cmd.FlagWithArg("--build-fingerprint-file=", config.BuildFingerprintFile(ctx).String())
+ // Export build thumbprint only if the product has specified at least one oem fingerprint property
+ // b/17888863
+ if shouldAddBuildThumbprint(config) {
+ // In the previous make implementation, a dependency was not added on the thumbprint file
+ cmd.FlagWithArg("--build-thumbprint-file=", config.BuildThumbprintFile(ctx).String())
+ }
+ cmd.FlagWithArg("--build-username=", config.Getenv("BUILD_USERNAME"))
+ // shouldn't depend on BUILD_DATETIME_FILE to prevent from rebuilding on every incremental
+ // build.
+ cmd.FlagWithArg("--date-file=", ctx.Config().Getenv("BUILD_DATETIME_FILE"))
+ cmd.FlagWithInput("--platform-preview-sdk-fingerprint-file=", ApiFingerprintPath(ctx))
+ cmd.FlagWithInput("--product-config=", PathForModuleSrc(ctx, proptools.String(p.properties.Product_config)))
+ cmd.FlagWithArg("--partition=", partition)
+ cmd.FlagWithOutput("--out=", p.outputFilePath)
+
+ postProcessCmd := rule.Command().BuiltTool("post_process_props")
+ if ctx.DeviceConfig().BuildBrokenDupSysprop() {
+ postProcessCmd.Flag("--allow-dup")
+ }
+ postProcessCmd.FlagWithArg("--sdk-version ", config.PlatformSdkVersion().String())
+ postProcessCmd.FlagWithInput("--kernel-version-file-for-uffd-gc ", PathForOutput(ctx, "dexpreopt/kernel_version_for_uffd_gc.txt"))
+ postProcessCmd.Text(p.outputFilePath.String())
+ postProcessCmd.Flags(p.properties.Block_list)
+
+ rule.Command().Text("echo").Text(proptools.NinjaAndShellEscape("# end of file")).FlagWithArg(">> ", p.outputFilePath.String())
+
+ rule.Build(ctx.ModuleName(), "generating build.prop")
+
+ p.installPath = PathForModuleInstall(ctx)
+ ctx.InstallFile(p.installPath, p.stem(), p.outputFilePath)
+
+ ctx.SetOutputFiles(Paths{p.outputFilePath}, "")
+}
+
+// build_prop module generates {partition}/build.prop file. At first common build properties are
+// printed based on Soong config variables. And then prop_files are printed as-is. Finally,
+// post_process_props tool is run to check if the result build.prop is valid or not.
+func buildPropFactory() Module {
+ module := &buildPropModule{}
+ module.AddProperties(&module.properties)
+ InitAndroidArchModule(module, DeviceSupported, MultilibCommon)
+ return module
+}