Add kernel_config build rule.
Test: builds
Change-Id: If35ff7292dbe1e28ec6b879bb4fe0b80f82f5232
diff --git a/build/Android.bp b/build/Android.bp
new file mode 100644
index 0000000..f7efbf6
--- /dev/null
+++ b/build/Android.bp
@@ -0,0 +1,28 @@
+// Copyright (C) 2018 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.
+
+bootstrap_go_package {
+ name: "kernel-config-soong-rules",
+ pkgPath: "android/soong/kernel/configs",
+ deps: [
+ "blueprint",
+ "blueprint-proptools",
+ "soong",
+ "soong-android",
+ ],
+ srcs: [
+ "kernel_config.go",
+ ],
+ pluginFor: ["soong_build"],
+}
diff --git a/build/kernel_config.go b/build/kernel_config.go
new file mode 100644
index 0000000..989cc31
--- /dev/null
+++ b/build/kernel_config.go
@@ -0,0 +1,120 @@
+// Copyright (C) 2018 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 configs
+
+import (
+ "strings"
+
+ "github.com/google/blueprint"
+ "github.com/google/blueprint/proptools"
+
+ "android/soong/android"
+)
+
+var (
+ pctx = android.NewPackageContext("android/soong/kernel/configs")
+
+ kconfigXmlFixupRule = pctx.AndroidStaticRule("kconfig_xml_fixup", blueprint.RuleParams{
+ Command: `${kconfigXmlFixupCmd} --input ${in} --output-version ${outputVersion} --output-matrix ${out}`,
+ CommandDeps: []string{"${kconfigXmlFixupCmd}"},
+ Description: "kconfig_xml_fixup ${in}",
+ }, "outputVersion")
+
+ assembleVintfRule = pctx.AndroidStaticRule("assemble_vintf", blueprint.RuleParams{
+ Command: `${assembleVintfCmd} ${flags} -i ${in} -o ${out}`,
+ CommandDeps: []string{"${assembleVintfCmd}"},
+ Description: "assemble_vintf -i ${in}",
+ }, "flags")
+)
+
+type KernelConfigProperties struct {
+ // list of source files that should be named "android-base.config" for common requirements
+ // and "android-base-foo.config" for requirements on condition CONFIG_FOO=y.
+ Srcs []string
+
+ // metadata XML file that contains minlts and complex conditional requirements.
+ Meta *string
+}
+
+type KernelConfigRule struct {
+ android.ModuleBase
+ properties KernelConfigProperties
+
+ outputPath android.WritablePath
+}
+
+func init() {
+ pctx.HostBinToolVariable("assembleVintfCmd", "assemble_vintf")
+ pctx.HostBinToolVariable("kconfigXmlFixupCmd", "kconfig_xml_fixup")
+ android.RegisterModuleType("kernel_config", kernelConfigFactory)
+}
+
+func kernelConfigFactory() android.Module {
+ g := &KernelConfigRule{}
+ g.AddProperties(&g.properties)
+ android.InitAndroidModule(g)
+ return g
+}
+
+func (g *KernelConfigRule) OutputPath() android.Path {
+ return g.outputPath
+}
+
+func (g *KernelConfigRule) DepsMutator(ctx android.BottomUpMutatorContext) {
+ android.ExtractSourcesDeps(ctx, g.properties.Srcs)
+ android.ExtractSourceDeps(ctx, g.properties.Meta)
+}
+
+func (g *KernelConfigRule) GenerateAndroidBuildActions(ctx android.ModuleContext) {
+ g.outputPath = android.PathForModuleOut(ctx, "matrix.xml")
+ genVersion := android.PathForModuleGen(ctx, "version.txt")
+ genConditionals := android.PathForModuleGen(ctx, "conditional.xml")
+ inputMeta := android.PathForModuleSrc(ctx, proptools.String(g.properties.Meta))
+
+ if proptools.String(g.properties.Meta) == "" {
+ ctx.PropertyErrorf("kernel_config", "Missing meta field")
+ }
+
+ ctx.Build(pctx, android.BuildParams{
+ Rule: kconfigXmlFixupRule,
+ Description: "Fixup kernel config meta",
+ Input: inputMeta,
+ Output: genConditionals,
+ ImplicitOutput: genVersion,
+ Args: map[string]string{
+ "outputVersion": genVersion.String(),
+ },
+ })
+
+ var kernelArg string
+ inputConfigs := android.PathsForModuleSrc(ctx, g.properties.Srcs)
+ implicitInputs := append(inputConfigs, genVersion)
+ if len(inputConfigs) > 0 {
+ kernelArg = "--kernel=$$(cat " + genVersion.String() + "):" +
+ strings.Join(inputConfigs.Strings(), ":")
+ }
+
+ ctx.Build(pctx, android.BuildParams{
+ Rule: assembleVintfRule,
+ Description: "Framework Compatibility Matrix kernel fragment",
+ Input: genConditionals,
+ Implicits: implicitInputs,
+ Output: g.outputPath,
+ Args: map[string]string{
+ "flags": kernelArg,
+ },
+ })
+
+}
