Merge changes from topic "metalava_sandbox" into rvc-dev

* changes:
  Turn on metalava sandbox warning in all droiddoc metalava invocations.
  Add support for Metalava implicit dependencies for remote execution.
  Add sourcepath to inputs of remoteable metalava action.
  Add support for the remote execution of metalava actions.
diff --git a/java/droiddoc.go b/java/droiddoc.go
index cf4c892..6e98650 100644
--- a/java/droiddoc.go
+++ b/java/droiddoc.go
@@ -24,6 +24,7 @@
 
 	"android/soong/android"
 	"android/soong/java/config"
+	"android/soong/remoteexec"
 )
 
 func init() {
@@ -375,6 +376,7 @@
 	srcFiles    android.Paths
 	sourcepaths android.Paths
 	argFiles    android.Paths
+	implicits   android.Paths
 
 	args string
 
@@ -574,6 +576,7 @@
 	// do not pass exclude_srcs directly when expanding srcFiles since exclude_srcs
 	// may contain filegroup or genrule.
 	srcFiles := android.PathsForModuleSrcExcludes(ctx, j.properties.Srcs, j.properties.Exclude_srcs)
+	j.implicits = append(j.implicits, srcFiles...)
 
 	filterByPackage := func(srcs []android.Path, filterPackages []string) []android.Path {
 		if filterPackages == nil {
@@ -599,6 +602,24 @@
 	}
 	srcFiles = filterByPackage(srcFiles, j.properties.Filter_packages)
 
+	// While metalava needs package html files, it does not need them to be explicit on the command
+	// line. More importantly, the metalava rsp file is also used by the subsequent jdiff action if
+	// jdiff_enabled=true. javadoc complains if it receives html files on the command line. The filter
+	// below excludes html files from the rsp file for both metalava and jdiff. Note that the html
+	// files are still included as implicit inputs for successful remote execution and correct
+	// incremental builds.
+	filterHtml := func(srcs []android.Path) []android.Path {
+		filtered := []android.Path{}
+		for _, src := range srcs {
+			if src.Ext() == ".html" {
+				continue
+			}
+			filtered = append(filtered, src)
+		}
+		return filtered
+	}
+	srcFiles = filterHtml(srcFiles)
+
 	flags := j.collectAidlFlags(ctx, deps)
 	srcFiles = j.genSources(ctx, srcFiles, flags)
 
@@ -1398,15 +1419,61 @@
 }
 
 func metalavaCmd(ctx android.ModuleContext, rule *android.RuleBuilder, javaVersion javaVersion, srcs android.Paths,
-	srcJarList android.Path, bootclasspath, classpath classpath, sourcepaths android.Paths) *android.RuleBuilderCommand {
+	srcJarList android.Path, bootclasspath, classpath classpath, sourcepaths android.Paths, implicits android.Paths) *android.RuleBuilderCommand {
 	// Metalava uses lots of memory, restrict the number of metalava jobs that can run in parallel.
 	rule.HighMem()
-	cmd := rule.Command().BuiltTool(ctx, "metalava").
+	cmd := rule.Command()
+
+	var implicitsRsp android.WritablePath
+	if len(implicits) > 0 {
+		implicitsRsp = android.PathForModuleOut(ctx, ctx.ModuleName()+"-"+"implicits.rsp")
+		impRule := android.NewRuleBuilder()
+		impCmd := impRule.Command()
+		// A dummy action that copies the ninja generated rsp file to a new location. This allows us to
+		// add a large number of inputs to a file without exceeding bash command length limits (which
+		// would happen if we use the WriteFile rule). The cp is needed because RuleBuilder sets the
+		// rsp file to be ${output}.rsp.
+		impCmd.Text("cp").FlagWithRspFileInputList("", implicits).Output(implicitsRsp)
+		impRule.Build(pctx, ctx, "implicitsGen", "implicits generation")
+		cmd.Implicits(implicits)
+		cmd.Implicit(implicitsRsp)
+	}
+	if ctx.Config().IsEnvTrue("RBE_METALAVA") {
+		rule.Remoteable(android.RemoteRuleSupports{RBE: true})
+		execStrategy := remoteexec.LocalExecStrategy
+		if v := ctx.Config().Getenv("RBE_METALAVA_EXEC_STRATEGY"); v != "" {
+			execStrategy = v
+		}
+		pool := "metalava"
+		if v := ctx.Config().Getenv("RBE_METALAVA_POOL"); v != "" {
+			pool = v
+		}
+		inputs := []string{android.PathForOutput(ctx, "host", ctx.Config().PrebuiltOS(), "framework", "metalava.jar").String()}
+		inputs = append(inputs, sourcepaths.Strings()...)
+		if v := ctx.Config().Getenv("RBE_METALAVA_INPUTS"); v != "" {
+			inputs = append(inputs, strings.Split(v, ",")...)
+		}
+		cmd.Text((&remoteexec.REParams{
+			Labels:          map[string]string{"type": "compile", "lang": "java", "compiler": "metalava", "shallow": "true"},
+			ExecStrategy:    execStrategy,
+			Inputs:          inputs,
+			RSPFile:         implicitsRsp.String(),
+			ToolchainInputs: []string{config.JavaCmd(ctx).String()},
+			Platform:        map[string]string{remoteexec.PoolKey: pool},
+		}).NoVarTemplate(ctx.Config()))
+	}
+
+	cmd.BuiltTool(ctx, "metalava").
 		Flag(config.JavacVmFlags).
 		FlagWithArg("-encoding ", "UTF-8").
 		FlagWithArg("-source ", javaVersion.String()).
 		FlagWithRspFileInputList("@", srcs).
-		FlagWithInput("@", srcJarList)
+		FlagWithInput("@", srcJarList).
+		FlagWithOutput("--strict-input-files:warn ", android.PathForModuleOut(ctx, ctx.ModuleName()+"-"+"violations.txt"))
+
+	if implicitsRsp.String() != "" {
+		cmd.FlagWithArg("--strict-input-files-exempt ", "@"+implicitsRsp.String())
+	}
 
 	if len(bootclasspath) > 0 {
 		cmd.FlagWithInputList("-bootclasspath ", bootclasspath.Paths(), ":")
@@ -1453,7 +1520,7 @@
 	srcJarList := zipSyncCmd(ctx, rule, srcJarDir, d.Javadoc.srcJars)
 
 	cmd := metalavaCmd(ctx, rule, javaVersion, d.Javadoc.srcFiles, srcJarList,
-		deps.bootClasspath, deps.classpath, d.Javadoc.sourcepaths)
+		deps.bootClasspath, deps.classpath, d.Javadoc.sourcepaths, d.Javadoc.implicits)
 
 	d.stubsFlags(ctx, cmd, stubsDir)
 
diff --git a/java/java_test.go b/java/java_test.go
index bb3ecb6..99f67ae 100644
--- a/java/java_test.go
+++ b/java/java_test.go
@@ -1038,7 +1038,7 @@
 	for _, i := range metalavaRule.Implicits {
 		systemJars = append(systemJars, i.Base())
 	}
-	if len(systemJars) != 1 || systemJars[0] != systemJar {
+	if len(systemJars) < 1 || systemJars[0] != systemJar {
 		t.Errorf("inputs of %q must be []string{%q}, but was %#v.", moduleName, systemJar, systemJars)
 	}
 }
diff --git a/remoteexec/remoteexec.go b/remoteexec/remoteexec.go
index c7d518e..d6e2c0a 100644
--- a/remoteexec/remoteexec.go
+++ b/remoteexec/remoteexec.go
@@ -75,8 +75,8 @@
 	// OutputFiles is a list of output file paths or ninja variables as placeholders for rule
 	// outputs.
 	OutputFiles []string
-	// OutputDirectories is a list of output directory paths or ninja variables as placeholders
-	// for rule outputs.
+	// OutputDirectories is a list of output directories or ninja variables as placeholders for
+	// rule output directories.
 	OutputDirectories []string
 	// ToolchainInputs is a list of paths or ninja variables pointing to the location of
 	// toolchain binaries used by the rule.
@@ -85,17 +85,31 @@
 
 func init() {
 	pctx.VariableFunc("Wrapper", func(ctx android.PackageVarContext) string {
-		if override := ctx.Config().Getenv("RBE_WRAPPER"); override != "" {
-			return override
-		}
-		return DefaultWrapperPath
+		return wrapper(ctx.Config())
 	})
 }
 
-// Generate the remote execution wrapper template to be added as a prefix to the rule's command.
-func (r *REParams) Template() string {
-	template := "${remoteexec.Wrapper}"
+func wrapper(cfg android.Config) string {
+	if override := cfg.Getenv("RBE_WRAPPER"); override != "" {
+		return override
+	}
+	return DefaultWrapperPath
+}
 
+// Template generates the remote execution wrapper template to be added as a prefix to the rule's
+// command.
+func (r *REParams) Template() string {
+	return "${remoteexec.Wrapper}" + r.wrapperArgs()
+}
+
+// NoVarTemplate generates the remote execution wrapper template without variables, to be used in
+// RuleBuilder.
+func (r *REParams) NoVarTemplate(cfg android.Config) string {
+	return wrapper(cfg) + r.wrapperArgs()
+}
+
+func (r *REParams) wrapperArgs() string {
+	args := ""
 	var kvs []string
 	labels := r.Labels
 	if len(labels) == 0 {
@@ -105,7 +119,7 @@
 		kvs = append(kvs, k+"="+v)
 	}
 	sort.Strings(kvs)
-	template += " --labels=" + strings.Join(kvs, ",")
+	args += " --labels=" + strings.Join(kvs, ",")
 
 	var platform []string
 	for k, v := range r.Platform {
@@ -119,36 +133,36 @@
 	}
 	if platform != nil {
 		sort.Strings(platform)
-		template += " --platform=\"" + strings.Join(platform, ",") + "\""
+		args += " --platform=\"" + strings.Join(platform, ",") + "\""
 	}
 
 	strategy := r.ExecStrategy
 	if strategy == "" {
 		strategy = defaultExecStrategy
 	}
-	template += " --exec_strategy=" + strategy
+	args += " --exec_strategy=" + strategy
 
 	if len(r.Inputs) > 0 {
-		template += " --inputs=" + strings.Join(r.Inputs, ",")
+		args += " --inputs=" + strings.Join(r.Inputs, ",")
 	}
 
 	if r.RSPFile != "" {
-		template += " --input_list_paths=" + r.RSPFile
+		args += " --input_list_paths=" + r.RSPFile
 	}
 
 	if len(r.OutputFiles) > 0 {
-		template += " --output_files=" + strings.Join(r.OutputFiles, ",")
+		args += " --output_files=" + strings.Join(r.OutputFiles, ",")
 	}
 
 	if len(r.OutputDirectories) > 0 {
-		template += " --output_directories=" + strings.Join(r.OutputDirectories, ",")
+		args += " --output_directories=" + strings.Join(r.OutputDirectories, ",")
 	}
 
 	if len(r.ToolchainInputs) > 0 {
-		template += " --toolchain_inputs=" + strings.Join(r.ToolchainInputs, ",")
+		args += " --toolchain_inputs=" + strings.Join(r.ToolchainInputs, ",")
 	}
 
-	return template + " -- "
+	return args + " -- "
 }
 
 // StaticRules returns a pair of rules based on the given RuleParams, where the first rule is a
diff --git a/remoteexec/remoteexec_test.go b/remoteexec/remoteexec_test.go
index 30e891c..56985d3 100644
--- a/remoteexec/remoteexec_test.go
+++ b/remoteexec/remoteexec_test.go
@@ -17,6 +17,8 @@
 import (
 	"fmt"
 	"testing"
+
+	"android/soong/android"
 )
 
 func TestTemplate(t *testing.T) {
@@ -64,6 +66,22 @@
 	}
 }
 
+func TestNoVarTemplate(t *testing.T) {
+	params := &REParams{
+		Labels:      map[string]string{"type": "compile", "lang": "cpp", "compiler": "clang"},
+		Inputs:      []string{"$in"},
+		OutputFiles: []string{"$out"},
+		Platform: map[string]string{
+			ContainerImageKey: DefaultImage,
+			PoolKey:           "default",
+		},
+	}
+	want := fmt.Sprintf("prebuilts/remoteexecution-client/live/rewrapper --labels=compiler=clang,lang=cpp,type=compile --platform=\"Pool=default,container-image=%s\" --exec_strategy=local --inputs=$in --output_files=$out -- ", DefaultImage)
+	if got := params.NoVarTemplate(android.NullConfig("")); got != want {
+		t.Errorf("NoVarTemplate() returned\n%s\nwant\n%s", got, want)
+	}
+}
+
 func TestTemplateDeterminism(t *testing.T) {
 	r := &REParams{
 		Labels:      map[string]string{"type": "compile", "lang": "cpp", "compiler": "clang"},