apex/builder.go

// Copyright (C) 2019 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 apex

import (
	"encoding/json"
	"fmt"
	"path/filepath"
	"runtime"
	"sort"
	"strconv"
	"strings"

	"android/soong/android"
	"android/soong/java"

	"github.com/google/blueprint"
	"github.com/google/blueprint/proptools"
)

var (
	pctx = android.NewPackageContext("android/apex")
)

func init() {
	pctx.Import("android/soong/android")
	pctx.Import("android/soong/cc/config")
	pctx.Import("android/soong/java")
	pctx.HostBinToolVariable("apexer", "apexer")
	pctx.HostBinToolVariable("apexer_with_DCLA_preprocessing", "apexer_with_DCLA_preprocessing")
	pctx.HostBinToolVariable("apexer_with_trim_preprocessing", "apexer_with_trim_preprocessing")

	// ART minimal builds (using the master-art manifest) do not have the "frameworks/base"
	// projects, and hence cannot build 'aapt2'. Use the SDK prebuilt instead.
	hostBinToolVariableWithPrebuilt := func(name, prebuiltDir, tool string) {
		pctx.VariableFunc(name, func(ctx android.PackageVarContext) string {
			if !ctx.Config().FrameworksBaseDirExists(ctx) {
				return filepath.Join(prebuiltDir, runtime.GOOS, "bin", tool)
			} else {
				return ctx.Config().HostToolPath(ctx, tool).String()
			}
		})
	}
	hostBinToolVariableWithPrebuilt("aapt2", "prebuilts/sdk/tools", "aapt2")
	pctx.HostBinToolVariable("avbtool", "avbtool")
	pctx.HostBinToolVariable("e2fsdroid", "e2fsdroid")
	pctx.HostBinToolVariable("merge_zips", "merge_zips")
	pctx.HostBinToolVariable("mke2fs", "mke2fs")
	pctx.HostBinToolVariable("resize2fs", "resize2fs")
	pctx.HostBinToolVariable("sefcontext_compile", "sefcontext_compile")
	pctx.HostBinToolVariable("soong_zip", "soong_zip")
	pctx.HostBinToolVariable("zip2zip", "zip2zip")
	pctx.HostBinToolVariable("zipalign", "zipalign")
	pctx.HostBinToolVariable("jsonmodify", "jsonmodify")
	pctx.HostBinToolVariable("conv_apex_manifest", "conv_apex_manifest")
	pctx.HostBinToolVariable("extract_apks", "extract_apks")
	pctx.HostBinToolVariable("make_f2fs", "make_f2fs")
	pctx.HostBinToolVariable("sload_f2fs", "sload_f2fs")
	pctx.HostBinToolVariable("make_erofs", "make_erofs")
	pctx.HostBinToolVariable("apex_compression_tool", "apex_compression_tool")
	pctx.HostBinToolVariable("dexdeps", "dexdeps")
	pctx.HostBinToolVariable("apex_sepolicy_tests", "apex_sepolicy_tests")
	pctx.HostBinToolVariable("deapexer", "deapexer")
	pctx.HostBinToolVariable("debugfs_static", "debugfs_static")
	pctx.SourcePathVariable("genNdkUsedbyApexPath", "build/soong/scripts/gen_ndk_usedby_apex.sh")
}

var (
	apexManifestRule = pctx.StaticRule("apexManifestRule", blueprint.RuleParams{
		Command: `rm -f $out && ${jsonmodify} $in ` +
			`-a provideNativeLibs ${provideNativeLibs} ` +
			`-a requireNativeLibs ${requireNativeLibs} ` +
			`-se version 0 ${default_version} ` +
			`${opt} ` +
			`-o $out`,
		CommandDeps: []string{"${jsonmodify}"},
		Description: "prepare ${out}",
	}, "provideNativeLibs", "requireNativeLibs", "default_version", "opt")

	stripApexManifestRule = pctx.StaticRule("stripApexManifestRule", blueprint.RuleParams{
		Command:     `rm -f $out && ${conv_apex_manifest} strip $in -o $out`,
		CommandDeps: []string{"${conv_apex_manifest}"},
		Description: "strip ${in}=>${out}",
	})

	pbApexManifestRule = pctx.StaticRule("pbApexManifestRule", blueprint.RuleParams{
		Command:     `rm -f $out && ${conv_apex_manifest} proto $in -o $out`,
		CommandDeps: []string{"${conv_apex_manifest}"},
		Description: "convert ${in}=>${out}",
	})

	// TODO(b/113233103): make sure that file_contexts is as expected, i.e., validate
	// against the binary policy using sefcontext_compiler -p <policy>.

	// TODO(b/114327326): automate the generation of file_contexts
	apexRule = pctx.StaticRule("apexRule", blueprint.RuleParams{
		Command: `rm -rf ${image_dir} && mkdir -p ${image_dir} && ` +
			`(. ${out}.copy_commands) && ` +
			`APEXER_TOOL_PATH=${tool_path} ` +
			`${apexer} --force --manifest ${manifest} ` +
			`--file_contexts ${file_contexts} ` +
			`--canned_fs_config ${canned_fs_config} ` +
			`--include_build_info ` +
			`--payload_type image ` +
			`--key ${key} ${opt_flags} ${image_dir} ${out} `,
		CommandDeps: []string{"${apexer}", "${avbtool}", "${e2fsdroid}", "${merge_zips}",
			"${mke2fs}", "${resize2fs}", "${sefcontext_compile}", "${make_f2fs}", "${sload_f2fs}", "${make_erofs}",
			"${soong_zip}", "${zipalign}", "${aapt2}", "prebuilts/sdk/current/public/android.jar"},
		Rspfile:        "${out}.copy_commands",
		RspfileContent: "${copy_commands}",
		Description:    "APEX ${image_dir} => ${out}",
	}, "tool_path", "image_dir", "copy_commands", "file_contexts", "canned_fs_config", "key",
		"opt_flags", "manifest")

	DCLAApexRule = pctx.StaticRule("DCLAApexRule", blueprint.RuleParams{
		Command: `rm -rf ${image_dir} && mkdir -p ${image_dir} && ` +
			`(. ${out}.copy_commands) && ` +
			`APEXER_TOOL_PATH=${tool_path} ` +
			`${apexer_with_DCLA_preprocessing} ` +
			`--apexer ${apexer} ` +
			`--canned_fs_config ${canned_fs_config} ` +
			`${image_dir} ` +
			`${out} ` +
			`-- ` +
			`--include_build_info ` +
			`--force ` +
			`--payload_type image ` +
			`--key ${key} ` +
			`--file_contexts ${file_contexts} ` +
			`--manifest ${manifest} ` +
			`${opt_flags} `,
		CommandDeps: []string{"${apexer_with_DCLA_preprocessing}", "${apexer}", "${avbtool}", "${e2fsdroid}",
			"${merge_zips}", "${mke2fs}", "${resize2fs}", "${sefcontext_compile}", "${make_f2fs}",
			"${sload_f2fs}", "${make_erofs}", "${soong_zip}", "${zipalign}", "${aapt2}",
			"prebuilts/sdk/current/public/android.jar"},
		Rspfile:        "${out}.copy_commands",
		RspfileContent: "${copy_commands}",
		Description:    "APEX ${image_dir} => ${out}",
	}, "tool_path", "image_dir", "copy_commands", "file_contexts", "canned_fs_config", "key",
		"opt_flags", "manifest", "is_DCLA")

	TrimmedApexRule = pctx.StaticRule("TrimmedApexRule", blueprint.RuleParams{
		Command: `rm -rf ${image_dir} && mkdir -p ${image_dir} && ` +
			`(. ${out}.copy_commands) && ` +
			`APEXER_TOOL_PATH=${tool_path} ` +
			`${apexer_with_trim_preprocessing} ` +
			`--apexer ${apexer} ` +
			`--canned_fs_config ${canned_fs_config} ` +
			`--manifest ${manifest} ` +
			`--libs_to_trim ${libs_to_trim} ` +
			`${image_dir} ` +
			`${out} ` +
			`-- ` +
			`--include_build_info ` +
			`--force ` +
			`--payload_type image ` +
			`--key ${key} ` +
			`--file_contexts ${file_contexts} ` +
			`${opt_flags} `,
		CommandDeps: []string{"${apexer_with_trim_preprocessing}", "${apexer}", "${avbtool}", "${e2fsdroid}",
			"${merge_zips}", "${mke2fs}", "${resize2fs}", "${sefcontext_compile}", "${make_f2fs}",
			"${sload_f2fs}", "${make_erofs}", "${soong_zip}", "${zipalign}", "${aapt2}",
			"prebuilts/sdk/current/public/android.jar"},
		Rspfile:        "${out}.copy_commands",
		RspfileContent: "${copy_commands}",
		Description:    "APEX ${image_dir} => ${out}",
	}, "tool_path", "image_dir", "copy_commands", "file_contexts", "canned_fs_config", "key",
		"opt_flags", "manifest", "libs_to_trim")

	apexProtoConvertRule = pctx.AndroidStaticRule("apexProtoConvertRule",
		blueprint.RuleParams{
			Command:     `${aapt2} convert --output-format proto $in -o $out`,
			CommandDeps: []string{"${aapt2}"},
		})

	apexBundleRule = pctx.StaticRule("apexBundleRule", blueprint.RuleParams{
		Command: `${zip2zip} -i $in -o $out.base ` +
			`apex_payload.img:apex/${abi}.img ` +
			`apex_build_info.pb:apex/${abi}.build_info.pb ` +
			`apex_manifest.json:root/apex_manifest.json ` +
			`apex_manifest.pb:root/apex_manifest.pb ` +
			`AndroidManifest.xml:manifest/AndroidManifest.xml ` +
			`assets/NOTICE.html.gz:assets/NOTICE.html.gz &&` +
			`${soong_zip} -o $out.config -C $$(dirname ${config}) -f ${config} && ` +
			`${merge_zips} $out $out.base $out.config`,
		CommandDeps: []string{"${zip2zip}", "${soong_zip}", "${merge_zips}"},
		Description: "app bundle",
	}, "abi", "config")

	diffApexContentRule = pctx.StaticRule("diffApexContentRule", blueprint.RuleParams{
		Command: `diff --unchanged-group-format='' \` +
			`--changed-group-format='%<' \` +
			`${image_content_file} ${allowed_files_file} || (` +
			`echo -e "New unexpected files were added to ${apex_module_name}." ` +
			` "To fix the build run following command:" && ` +
			`echo "system/apex/tools/update_allowed_list.sh ${allowed_files_file} ${image_content_file}" && ` +
			`exit 1); touch ${out}`,
		Description: "Diff ${image_content_file} and ${allowed_files_file}",
	}, "image_content_file", "allowed_files_file", "apex_module_name")

	generateAPIsUsedbyApexRule = pctx.StaticRule("generateAPIsUsedbyApexRule", blueprint.RuleParams{
		Command:     "$genNdkUsedbyApexPath ${image_dir} ${readelf} ${out}",
		CommandDeps: []string{"${genNdkUsedbyApexPath}"},
		Description: "Generate symbol list used by Apex",
	}, "image_dir", "readelf")

	apexSepolicyTestsRule = pctx.StaticRule("apexSepolicyTestsRule", blueprint.RuleParams{
		Command: `${deapexer} --debugfs_path ${debugfs_static} list -Z ${in} > ${out}.fc` +
			` && ${apex_sepolicy_tests} -f ${out}.fc && touch ${out}`,
		CommandDeps: []string{"${apex_sepolicy_tests}", "${deapexer}", "${debugfs_static}"},
		Description: "run apex_sepolicy_tests",
	})
)

// buildManifest creates buile rules to modify the input apex_manifest.json to add information
// gathered by the build system such as provided/required native libraries. Two output files having
// different formats are generated. a.manifestJsonOut is JSON format for Q devices, and
// a.manifest.PbOut is protobuf format for R+ devices.
// TODO(jiyong): make this to return paths instead of directly storing the paths to apexBundle
func (a *apexBundle) buildManifest(ctx android.ModuleContext, provideNativeLibs, requireNativeLibs []string) {
	src := android.PathForModuleSrc(ctx, proptools.StringDefault(a.properties.Manifest, "apex_manifest.json"))

	// Put dependency({provide|require}NativeLibs) in apex_manifest.json
	provideNativeLibs = android.SortedUniqueStrings(provideNativeLibs)
	requireNativeLibs = android.SortedUniqueStrings(android.RemoveListFromList(requireNativeLibs, provideNativeLibs))

	// VNDK APEX name is determined at runtime, so update "name" in apex_manifest
	optCommands := []string{}
	if a.vndkApex {
		apexName := vndkApexNamePrefix + a.vndkVersion(ctx.DeviceConfig())
		optCommands = append(optCommands, "-v name "+apexName)
	}

	// Collect jniLibs. Notice that a.filesInfo is already sorted
	var jniLibs []string
	for _, fi := range a.filesInfo {
		if fi.isJniLib && !android.InList(fi.stem(), jniLibs) {
			jniLibs = append(jniLibs, fi.stem())
		}
	}
	if len(jniLibs) > 0 {
		optCommands = append(optCommands, "-a jniLibs "+strings.Join(jniLibs, " "))
	}

	if android.InList(":vndk", requireNativeLibs) {
		if _, vndkVersion := a.getImageVariationPair(ctx.DeviceConfig()); vndkVersion != "" {
			optCommands = append(optCommands, "-v vndkVersion "+vndkVersion)
		}
	}

	manifestJsonFullOut := android.PathForModuleOut(ctx, "apex_manifest_full.json")
	defaultVersion := android.DefaultUpdatableModuleVersion
	if a.properties.Variant_version != nil {
		defaultVersionInt, err := strconv.Atoi(defaultVersion)
		if err != nil {
			ctx.ModuleErrorf("expected DefaultUpdatableModuleVersion to be an int, but got %s", defaultVersion)
		}
		if defaultVersionInt%10 != 0 {
			ctx.ModuleErrorf("expected DefaultUpdatableModuleVersion to end in a zero, but got %s", defaultVersion)
		}
		variantVersion := []rune(*a.properties.Variant_version)
		if len(variantVersion) != 1 || variantVersion[0] < '0' || variantVersion[0] > '9' {
			ctx.PropertyErrorf("variant_version", "expected an integer between 0-9; got %s", *a.properties.Variant_version)
		}
		defaultVersionRunes := []rune(defaultVersion)
		defaultVersionRunes[len(defaultVersion)-1] = []rune(variantVersion)[0]
		defaultVersion = string(defaultVersionRunes)
	}
	if override := ctx.Config().Getenv("OVERRIDE_APEX_MANIFEST_DEFAULT_VERSION"); override != "" {
		defaultVersion = override
	}
	ctx.Build(pctx, android.BuildParams{
		Rule:   apexManifestRule,
		Input:  src,
		Output: manifestJsonFullOut,
		Args: map[string]string{
			"provideNativeLibs": strings.Join(provideNativeLibs, " "),
			"requireNativeLibs": strings.Join(requireNativeLibs, " "),
			"default_version":   defaultVersion,
			"opt":               strings.Join(optCommands, " "),
		},
	})

	// b/143654022 Q apexd can't understand newly added keys in apex_manifest.json prepare
	// stripped-down version so that APEX modules built from R+ can be installed to Q
	minSdkVersion := a.minSdkVersion(ctx)
	if minSdkVersion.EqualTo(android.SdkVersion_Android10) {
		a.manifestJsonOut = android.PathForModuleOut(ctx, "apex_manifest.json")
		ctx.Build(pctx, android.BuildParams{
			Rule:   stripApexManifestRule,
			Input:  manifestJsonFullOut,
			Output: a.manifestJsonOut,
		})
	}

	// From R+, protobuf binary format (.pb) is the standard format for apex_manifest
	a.manifestPbOut = android.PathForModuleOut(ctx, "apex_manifest.pb")
	ctx.Build(pctx, android.BuildParams{
		Rule:   pbApexManifestRule,
		Input:  manifestJsonFullOut,
		Output: a.manifestPbOut,
	})
}

// buildFileContexts create build rules to append an entry for apex_manifest.pb to the file_contexts
// file for this APEX which is either from /systme/sepolicy/apex/<apexname>-file_contexts or from
// the file_contexts property of this APEX. This is to make sure that the manifest file is correctly
// labeled as system_file or vendor_apex_metadata_file.
func (a *apexBundle) buildFileContexts(ctx android.ModuleContext) android.OutputPath {
	var fileContexts android.Path
	var fileContextsDir string
	if a.properties.File_contexts == nil {
		fileContexts = android.PathForSource(ctx, "system/sepolicy/apex", ctx.ModuleName()+"-file_contexts")
	} else {
		if m, t := android.SrcIsModuleWithTag(*a.properties.File_contexts); m != "" {
			otherModule := android.GetModuleFromPathDep(ctx, m, t)
			fileContextsDir = ctx.OtherModuleDir(otherModule)
		}
		fileContexts = android.PathForModuleSrc(ctx, *a.properties.File_contexts)
	}
	if fileContextsDir == "" {
		fileContextsDir = filepath.Dir(fileContexts.String())
	}
	fileContextsDir += string(filepath.Separator)

	if a.Platform() {
		if !strings.HasPrefix(fileContextsDir, "system/sepolicy/") {
			ctx.PropertyErrorf("file_contexts", "should be under system/sepolicy, but found in  %q", fileContextsDir)
		}
	}
	if !android.ExistentPathForSource(ctx, fileContexts.String()).Valid() {
		ctx.PropertyErrorf("file_contexts", "cannot find file_contexts file: %q", fileContexts.String())
	}

	useFileContextsAsIs := proptools.Bool(a.properties.Use_file_contexts_as_is)

	output := android.PathForModuleOut(ctx, "file_contexts")
	rule := android.NewRuleBuilder(pctx, ctx)

	forceLabel := "u:object_r:system_file:s0"
	if a.SocSpecific() && !a.vndkApex {
		// APEX on /vendor should label ./ and ./apex_manifest.pb as vendor_apex_metadata_file.
		// The reason why we skip VNDK APEX is that aosp_{pixel device} targets install VNDK APEX on /vendor
		// even though VNDK APEX is supposed to be installed on /system. (See com.android.vndk.current.on_vendor)
		forceLabel = "u:object_r:vendor_apex_metadata_file:s0"
	}
	// remove old file
	rule.Command().Text("rm").FlagWithOutput("-f ", output)
	// copy file_contexts
	rule.Command().Text("cat").Input(fileContexts).Text(">>").Output(output)
	// new line
	rule.Command().Text("echo").Text(">>").Output(output)
	if !useFileContextsAsIs {
		// force-label /apex_manifest.pb and /
		rule.Command().Text("echo").Text("/apex_manifest\\\\.pb").Text(forceLabel).Text(">>").Output(output)
		rule.Command().Text("echo").Text("/").Text(forceLabel).Text(">>").Output(output)
	}

	rule.Build("file_contexts."+a.Name(), "Generate file_contexts")
	return output.OutputPath
}

// buildInstalledFilesFile creates a build rule for the installed-files.txt file where the list of
// files included in this APEX is shown. The text file is dist'ed so that people can see what's
// included in the APEX without actually downloading and extracting it.
func (a *apexBundle) buildInstalledFilesFile(ctx android.ModuleContext, builtApex android.Path, imageDir android.Path) android.OutputPath {
	output := android.PathForModuleOut(ctx, "installed-files.txt")
	rule := android.NewRuleBuilder(pctx, ctx)
	rule.Command().
		Implicit(builtApex).
		Text("(cd " + imageDir.String() + " ; ").
		Text("find . \\( -type f -o -type l \\) -printf \"%s %p\\n\") ").
		Text(" | sort -nr > ").
		Output(output)
	rule.Build("installed-files."+a.Name(), "Installed files")
	return output.OutputPath
}

// buildBundleConfig creates a build rule for the bundle config file that will control the bundle
// creation process.
func (a *apexBundle) buildBundleConfig(ctx android.ModuleContext) android.OutputPath {
	output := android.PathForModuleOut(ctx, "bundle_config.json")

	type ApkConfig struct {
		Package_name string `json:"package_name"`
		Apk_path     string `json:"path"`
	}
	config := struct {
		Compression struct {
			Uncompressed_glob []string `json:"uncompressed_glob"`
		} `json:"compression"`
		Apex_config struct {
			Apex_embedded_apk_config []ApkConfig `json:"apex_embedded_apk_config,omitempty"`
		} `json:"apex_config,omitempty"`
	}{}

	config.Compression.Uncompressed_glob = []string{
		"apex_payload.img",
		"apex_manifest.*",
	}

	// Collect the manifest names and paths of android apps if their manifest names are
	// overridden.
	for _, fi := range a.filesInfo {
		if fi.class != app && fi.class != appSet {
			continue
		}
		packageName := fi.overriddenPackageName
		if packageName != "" {
			config.Apex_config.Apex_embedded_apk_config = append(
				config.Apex_config.Apex_embedded_apk_config,
				ApkConfig{
					Package_name: packageName,
					Apk_path:     fi.path(),
				})
		}
	}

	j, err := json.Marshal(config)
	if err != nil {
		panic(fmt.Errorf("error while marshalling to %q: %#v", output, err))
	}

	android.WriteFileRule(ctx, output, string(j))

	return output.OutputPath
}

func markManifestTestOnly(ctx android.ModuleContext, androidManifestFile android.Path) android.Path {
	return java.ManifestFixer(ctx, androidManifestFile, java.ManifestFixerParams{
		TestOnly: true,
	})
}

// buildApex creates build rules to build an APEX using apexer.
func (a *apexBundle) buildApex(ctx android.ModuleContext) {
	suffix := imageApexSuffix
	apexName := a.BaseModuleName()

	////////////////////////////////////////////////////////////////////////////////////////////
	// Step 1: copy built files to appropriate directories under the image directory

	imageDir := android.PathForModuleOut(ctx, "image"+suffix)

	installSymbolFiles := (!ctx.Config().KatiEnabled() || a.ExportedToMake()) && a.installable()

	// set of dependency module:location mappings
	installMapSet := make(map[string]bool)

	// TODO(jiyong): use the RuleBuilder
	var copyCommands []string
	var implicitInputs []android.Path
	apexDir := android.PathForModuleInPartitionInstall(ctx, "apex", apexName)
	for _, fi := range a.filesInfo {
		destPath := imageDir.Join(ctx, fi.path()).String()
		// Prepare the destination path
		destPathDir := filepath.Dir(destPath)
		if fi.class == appSet {
			copyCommands = append(copyCommands, "rm -rf "+destPathDir)
		}
		copyCommands = append(copyCommands, "mkdir -p "+destPathDir)

		installMapPath := fi.builtFile

		// Copy the built file to the directory. But if the symlink optimization is turned
		// on, place a symlink to the corresponding file in /system partition instead.
		if a.linkToSystemLib && fi.transitiveDep && fi.availableToPlatform() {
			pathOnDevice := filepath.Join("/", fi.partition, fi.path())
			copyCommands = append(copyCommands, "ln -sfn "+pathOnDevice+" "+destPath)
		} else {
			// Copy the file into APEX
			copyCommands = append(copyCommands, "cp -f "+fi.builtFile.String()+" "+destPath)

			var installedPath android.InstallPath
			if fi.class == appSet {
				// In case of AppSet, we need to copy additional APKs as well. They
				// are zipped. So we need to unzip them.
				copyCommands = append(copyCommands,
					fmt.Sprintf("unzip -qDD -d %s %s", destPathDir,
						fi.module.(*java.AndroidAppSet).PackedAdditionalOutputs().String()))
				if installSymbolFiles {
					installedPath = ctx.InstallFileWithExtraFilesZip(apexDir.Join(ctx, fi.installDir),
						fi.stem(), fi.builtFile, fi.module.(*java.AndroidAppSet).PackedAdditionalOutputs())
				}
			} else {
				if installSymbolFiles {
					installedPath = ctx.InstallFile(apexDir.Join(ctx, fi.installDir), fi.stem(), fi.builtFile)
				}
			}
			implicitInputs = append(implicitInputs, fi.builtFile)

			// Create additional symlinks pointing the file inside the APEX (if any). Note that
			// this is independent from the symlink optimization.
			for _, symlinkPath := range fi.symlinkPaths() {
				symlinkDest := imageDir.Join(ctx, symlinkPath).String()
				copyCommands = append(copyCommands, "ln -sfn "+filepath.Base(destPath)+" "+symlinkDest)
				if installSymbolFiles {
					ctx.InstallSymlink(apexDir.Join(ctx, filepath.Dir(symlinkPath)), filepath.Base(symlinkPath), installedPath)
				}
			}

			installMapPath = installedPath
		}

		// Copy the test files (if any)
		for _, d := range fi.dataPaths {
			// TODO(eakammer): This is now the third repetition of ~this logic for test paths, refactoring should be possible
			relPath := d.SrcPath.Rel()
			dataPath := d.SrcPath.String()
			if !strings.HasSuffix(dataPath, relPath) {
				panic(fmt.Errorf("path %q does not end with %q", dataPath, relPath))
			}

			dataDest := imageDir.Join(ctx, fi.apexRelativePath(relPath), d.RelativeInstallPath).String()

			copyCommands = append(copyCommands, "cp -f "+d.SrcPath.String()+" "+dataDest)
			implicitInputs = append(implicitInputs, d.SrcPath)
		}

		installMapSet[installMapPath.String()+":"+fi.installDir+"/"+fi.builtFile.Base()] = true
	}
	implicitInputs = append(implicitInputs, a.manifestPbOut)

	if len(installMapSet) > 0 {
		var installs []string
		installs = append(installs, android.SortedKeys(installMapSet)...)
		a.SetLicenseInstallMap(installs)
	}

	////////////////////////////////////////////////////////////////////////////////////////////
	// Step 1.a: Write the list of files in this APEX to a txt file and compare it against
	// the allowed list given via the allowed_files property. Build fails when the two lists
	// differ.
	//
	// TODO(jiyong): consider removing this. Nobody other than com.android.apex.cts.shim.* seems
	// to be using this at this moment. Furthermore, this looks very similar to what
	// buildInstalledFilesFile does. At least, move this to somewhere else so that this doesn't
	// hurt readability.
	if a.overridableProperties.Allowed_files != nil {
		// Build content.txt
		var contentLines []string
		imageContentFile := android.PathForModuleOut(ctx, "content.txt")
		contentLines = append(contentLines, "./apex_manifest.pb")
		minSdkVersion := a.minSdkVersion(ctx)
		if minSdkVersion.EqualTo(android.SdkVersion_Android10) {
			contentLines = append(contentLines, "./apex_manifest.json")
		}
		for _, fi := range a.filesInfo {
			contentLines = append(contentLines, "./"+fi.path())
		}
		sort.Strings(contentLines)
		android.WriteFileRule(ctx, imageContentFile, strings.Join(contentLines, "\n"))
		implicitInputs = append(implicitInputs, imageContentFile)

		// Compare content.txt against allowed_files.
		allowedFilesFile := android.PathForModuleSrc(ctx, proptools.String(a.overridableProperties.Allowed_files))
		phonyOutput := android.PathForModuleOut(ctx, a.Name()+"-diff-phony-output")
		ctx.Build(pctx, android.BuildParams{
			Rule:        diffApexContentRule,
			Implicits:   implicitInputs,
			Output:      phonyOutput,
			Description: "diff apex image content",
			Args: map[string]string{
				"allowed_files_file": allowedFilesFile.String(),
				"image_content_file": imageContentFile.String(),
				"apex_module_name":   a.Name(),
			},
		})
		implicitInputs = append(implicitInputs, phonyOutput)
	}

	unsignedOutputFile := android.PathForModuleOut(ctx, a.Name()+suffix+".unsigned")
	outHostBinDir := ctx.Config().HostToolPath(ctx, "").String()
	prebuiltSdkToolsBinDir := filepath.Join("prebuilts", "sdk", "tools", runtime.GOOS, "bin")

	////////////////////////////////////////////////////////////////////////////////////
	// Step 2: create canned_fs_config which encodes filemode,uid,gid of each files
	// in this APEX. The file will be used by apexer in later steps.
	cannedFsConfig := a.buildCannedFsConfig(ctx)
	implicitInputs = append(implicitInputs, cannedFsConfig)

	////////////////////////////////////////////////////////////////////////////////////
	// Step 3: Prepare option flags for apexer and invoke it to create an unsigned APEX.
	// TODO(jiyong): use the RuleBuilder
	optFlags := []string{}

	fileContexts := a.buildFileContexts(ctx)
	implicitInputs = append(implicitInputs, fileContexts)

	implicitInputs = append(implicitInputs, a.privateKeyFile, a.publicKeyFile)
	optFlags = append(optFlags, "--pubkey "+a.publicKeyFile.String())

	manifestPackageName := a.getOverrideManifestPackageName(ctx)
	if manifestPackageName != "" {
		optFlags = append(optFlags, "--override_apk_package_name "+manifestPackageName)
	}

	if a.properties.AndroidManifest != nil {
		androidManifestFile := android.PathForModuleSrc(ctx, proptools.String(a.properties.AndroidManifest))

		if a.testApex {
			androidManifestFile = markManifestTestOnly(ctx, androidManifestFile)
		}

		implicitInputs = append(implicitInputs, androidManifestFile)
		optFlags = append(optFlags, "--android_manifest "+androidManifestFile.String())
	} else if a.testApex {
		optFlags = append(optFlags, "--test_only")
	}

	// Determine target/min sdk version from the context
	// TODO(jiyong): make this as a function
	moduleMinSdkVersion := a.minSdkVersion(ctx)
	minSdkVersion := moduleMinSdkVersion.String()

	// bundletool doesn't understand what "current" is. We need to transform it to
	// codename
	if moduleMinSdkVersion.IsCurrent() || moduleMinSdkVersion.IsNone() {
		minSdkVersion = ctx.Config().DefaultAppTargetSdk(ctx).String()

		if java.UseApiFingerprint(ctx) {
			minSdkVersion = ctx.Config().PlatformSdkCodename() + fmt.Sprintf(".$$(cat %s)", java.ApiFingerprintPath(ctx).String())
			implicitInputs = append(implicitInputs, java.ApiFingerprintPath(ctx))
		}
	}
	// apex module doesn't have a concept of target_sdk_version, hence for the time
	// being targetSdkVersion == default targetSdkVersion of the branch.
	targetSdkVersion := strconv.Itoa(ctx.Config().DefaultAppTargetSdk(ctx).FinalOrFutureInt())

	if java.UseApiFingerprint(ctx) {
		targetSdkVersion = ctx.Config().PlatformSdkCodename() + fmt.Sprintf(".$$(cat %s)", java.ApiFingerprintPath(ctx).String())
		implicitInputs = append(implicitInputs, java.ApiFingerprintPath(ctx))
	}
	optFlags = append(optFlags, "--target_sdk_version "+targetSdkVersion)
	optFlags = append(optFlags, "--min_sdk_version "+minSdkVersion)

	if a.overridableProperties.Logging_parent != "" {
		optFlags = append(optFlags, "--logging_parent ", a.overridableProperties.Logging_parent)
	}

	// Create a NOTICE file, and embed it as an asset file in the APEX.
	htmlGzNotice := android.PathForModuleOut(ctx, "NOTICE.html.gz")
	android.BuildNoticeHtmlOutputFromLicenseMetadata(
		ctx, htmlGzNotice, "", "",
		[]string{
			android.PathForModuleInstall(ctx).String() + "/",
			android.PathForModuleInPartitionInstall(ctx, "apex").String() + "/",
		})
	noticeAssetPath := android.PathForModuleOut(ctx, "NOTICE", "NOTICE.html.gz")
	builder := android.NewRuleBuilder(pctx, ctx)
	builder.Command().Text("cp").
		Input(htmlGzNotice).
		Output(noticeAssetPath)
	builder.Build("notice_dir", "Building notice dir")
	implicitInputs = append(implicitInputs, noticeAssetPath)
	optFlags = append(optFlags, "--assets_dir "+filepath.Dir(noticeAssetPath.String()))

	// Apexes which are supposed to be installed in builtin dirs(/system, etc)
	// don't need hashtree for activation. Therefore, by removing hashtree from
	// apex bundle (filesystem image in it, to be specific), we can save storage.
	needHashTree := moduleMinSdkVersion.LessThanOrEqualTo(android.SdkVersion_Android10) ||
		a.shouldGenerateHashtree()
	if ctx.Config().ApexCompressionEnabled() && a.isCompressable() {
		needHashTree = true
	}
	if !needHashTree {
		optFlags = append(optFlags, "--no_hashtree")
	}

	if a.testOnlyShouldSkipPayloadSign() {
		optFlags = append(optFlags, "--unsigned_payload")
	}

	if moduleMinSdkVersion == android.SdkVersion_Android10 {
		implicitInputs = append(implicitInputs, a.manifestJsonOut)
		optFlags = append(optFlags, "--manifest_json "+a.manifestJsonOut.String())
	}

	optFlags = append(optFlags, "--payload_fs_type "+a.payloadFsType.string())

	if a.dynamic_common_lib_apex() {
		ctx.Build(pctx, android.BuildParams{
			Rule:        DCLAApexRule,
			Implicits:   implicitInputs,
			Output:      unsignedOutputFile,
			Description: "apex",
			Args: map[string]string{
				"tool_path":        outHostBinDir + ":" + prebuiltSdkToolsBinDir,
				"image_dir":        imageDir.String(),
				"copy_commands":    strings.Join(copyCommands, " && "),
				"manifest":         a.manifestPbOut.String(),
				"file_contexts":    fileContexts.String(),
				"canned_fs_config": cannedFsConfig.String(),
				"key":              a.privateKeyFile.String(),
				"opt_flags":        strings.Join(optFlags, " "),
			},
		})
	} else if ctx.Config().ApexTrimEnabled() && len(a.libs_to_trim(ctx)) > 0 {
		ctx.Build(pctx, android.BuildParams{
			Rule:        TrimmedApexRule,
			Implicits:   implicitInputs,
			Output:      unsignedOutputFile,
			Description: "apex",
			Args: map[string]string{
				"tool_path":        outHostBinDir + ":" + prebuiltSdkToolsBinDir,
				"image_dir":        imageDir.String(),
				"copy_commands":    strings.Join(copyCommands, " && "),
				"manifest":         a.manifestPbOut.String(),
				"file_contexts":    fileContexts.String(),
				"canned_fs_config": cannedFsConfig.String(),
				"key":              a.privateKeyFile.String(),
				"opt_flags":        strings.Join(optFlags, " "),
				"libs_to_trim":     strings.Join(a.libs_to_trim(ctx), ","),
			},
		})
	} else {
		ctx.Build(pctx, android.BuildParams{
			Rule:        apexRule,
			Implicits:   implicitInputs,
			Output:      unsignedOutputFile,
			Description: "apex",
			Args: map[string]string{
				"tool_path":        outHostBinDir + ":" + prebuiltSdkToolsBinDir,
				"image_dir":        imageDir.String(),
				"copy_commands":    strings.Join(copyCommands, " && "),
				"manifest":         a.manifestPbOut.String(),
				"file_contexts":    fileContexts.String(),
				"canned_fs_config": cannedFsConfig.String(),
				"key":              a.privateKeyFile.String(),
				"opt_flags":        strings.Join(optFlags, " "),
			},
		})
	}

	// TODO(jiyong): make the two rules below as separate functions
	apexProtoFile := android.PathForModuleOut(ctx, a.Name()+".pb"+suffix)
	bundleModuleFile := android.PathForModuleOut(ctx, a.Name()+suffix+"-base.zip")
	a.bundleModuleFile = bundleModuleFile

	ctx.Build(pctx, android.BuildParams{
		Rule:        apexProtoConvertRule,
		Input:       unsignedOutputFile,
		Output:      apexProtoFile,
		Description: "apex proto convert",
	})

	implicitInputs = append(implicitInputs, unsignedOutputFile)

	// Run coverage analysis
	apisUsedbyOutputFile := android.PathForModuleOut(ctx, a.Name()+"_using.txt")
	ctx.Build(pctx, android.BuildParams{
		Rule:        generateAPIsUsedbyApexRule,
		Implicits:   implicitInputs,
		Description: "coverage",
		Output:      apisUsedbyOutputFile,
		Args: map[string]string{
			"image_dir": imageDir.String(),
			"readelf":   "${config.ClangBin}/llvm-readelf",
		},
	})
	a.nativeApisUsedByModuleFile = apisUsedbyOutputFile

	var nativeLibNames []string
	for _, f := range a.filesInfo {
		if f.class == nativeSharedLib {
			nativeLibNames = append(nativeLibNames, f.stem())
		}
	}
	apisBackedbyOutputFile := android.PathForModuleOut(ctx, a.Name()+"_backing.txt")
	rb := android.NewRuleBuilder(pctx, ctx)
	rb.Command().
		Tool(android.PathForSource(ctx, "build/soong/scripts/gen_ndk_backedby_apex.sh")).
		Output(apisBackedbyOutputFile).
		Flags(nativeLibNames)
	rb.Build("ndk_backedby_list", "Generate API libraries backed by Apex")
	a.nativeApisBackedByModuleFile = apisBackedbyOutputFile

	var javaLibOrApkPath []android.Path
	for _, f := range a.filesInfo {
		if f.class == javaSharedLib || f.class == app {
			javaLibOrApkPath = append(javaLibOrApkPath, f.builtFile)
		}
	}
	javaApiUsedbyOutputFile := android.PathForModuleOut(ctx, a.Name()+"_using.xml")
	javaUsedByRule := android.NewRuleBuilder(pctx, ctx)
	javaUsedByRule.Command().
		Tool(android.PathForSource(ctx, "build/soong/scripts/gen_java_usedby_apex.sh")).
		BuiltTool("dexdeps").
		Output(javaApiUsedbyOutputFile).
		Inputs(javaLibOrApkPath)
	javaUsedByRule.Build("java_usedby_list", "Generate Java APIs used by Apex")
	a.javaApisUsedByModuleFile = javaApiUsedbyOutputFile

	bundleConfig := a.buildBundleConfig(ctx)

	var abis []string
	for _, target := range ctx.MultiTargets() {
		if len(target.Arch.Abi) > 0 {
			abis = append(abis, target.Arch.Abi[0])
		}
	}

	abis = android.FirstUniqueStrings(abis)

	ctx.Build(pctx, android.BuildParams{
		Rule:        apexBundleRule,
		Input:       apexProtoFile,
		Implicit:    bundleConfig,
		Output:      a.bundleModuleFile,
		Description: "apex bundle module",
		Args: map[string]string{
			"abi":    strings.Join(abis, "."),
			"config": bundleConfig.String(),
		},
	})

	////////////////////////////////////////////////////////////////////////////////////
	// Step 4: Sign the APEX using signapk
	signedOutputFile := android.PathForModuleOut(ctx, a.Name()+suffix)

	pem, key := a.getCertificateAndPrivateKey(ctx)
	rule := java.Signapk
	args := map[string]string{
		"certificates": pem.String() + " " + key.String(),
		"flags":        "-a 4096 --align-file-size", //alignment
	}
	implicits := android.Paths{pem, key}
	if ctx.Config().UseRBE() && ctx.Config().IsEnvTrue("RBE_SIGNAPK") {
		rule = java.SignapkRE
		args["implicits"] = strings.Join(implicits.Strings(), ",")
		args["outCommaList"] = signedOutputFile.String()
	}
	var validations android.Paths
	// TODO(b/279688635) deapexer supports [ext4]
	if suffix == imageApexSuffix && ext4 == a.payloadFsType {
		validations = append(validations, runApexSepolicyTests(ctx, unsignedOutputFile.OutputPath))
	}
	ctx.Build(pctx, android.BuildParams{
		Rule:        rule,
		Description: "signapk",
		Output:      signedOutputFile,
		Input:       unsignedOutputFile,
		Implicits:   implicits,
		Args:        args,
		Validations: validations,
	})
	if suffix == imageApexSuffix {
		a.outputApexFile = signedOutputFile
	}
	a.outputFile = signedOutputFile

	if ctx.ModuleDir() != "system/apex/apexd/apexd_testdata" && a.testOnlyShouldForceCompression() {
		ctx.PropertyErrorf("test_only_force_compression", "not available")
		return
	}

	installSuffix := suffix
	a.setCompression(ctx)
	if a.isCompressed {
		unsignedCompressedOutputFile := android.PathForModuleOut(ctx, a.Name()+imageCapexSuffix+".unsigned")

		compressRule := android.NewRuleBuilder(pctx, ctx)
		compressRule.Command().
			Text("rm").
			FlagWithOutput("-f ", unsignedCompressedOutputFile)
		compressRule.Command().
			BuiltTool("apex_compression_tool").
			Flag("compress").
			FlagWithArg("--apex_compression_tool ", outHostBinDir+":"+prebuiltSdkToolsBinDir).
			FlagWithInput("--input ", signedOutputFile).
			FlagWithOutput("--output ", unsignedCompressedOutputFile)
		compressRule.Build("compressRule", "Generate unsigned compressed APEX file")

		signedCompressedOutputFile := android.PathForModuleOut(ctx, a.Name()+imageCapexSuffix)
		if ctx.Config().UseRBE() && ctx.Config().IsEnvTrue("RBE_SIGNAPK") {
			args["outCommaList"] = signedCompressedOutputFile.String()
		}
		ctx.Build(pctx, android.BuildParams{
			Rule:        rule,
			Description: "sign compressedApex",
			Output:      signedCompressedOutputFile,
			Input:       unsignedCompressedOutputFile,
			Implicits:   implicits,
			Args:        args,
		})
		a.outputFile = signedCompressedOutputFile
		installSuffix = imageCapexSuffix
	}

	if !a.installable() {
		a.SkipInstall()
	}

	// Install to $OUT/soong/{target,host}/.../apex.
	a.installedFile = ctx.InstallFile(a.installDir, a.Name()+installSuffix, a.outputFile,
		a.compatSymlinks.Paths()...)

	// installed-files.txt is dist'ed
	a.installedFilesFile = a.buildInstalledFilesFile(ctx, a.outputFile, imageDir)
}

// getCertificateAndPrivateKey retrieves the cert and the private key that will be used to sign
// the zip container of this APEX. See the description of the 'certificate' property for how
// the cert and the private key are found.
func (a *apexBundle) getCertificateAndPrivateKey(ctx android.PathContext) (pem, key android.Path) {
	if a.containerCertificateFile != nil {
		return a.containerCertificateFile, a.containerPrivateKeyFile
	}

	cert := String(a.overridableProperties.Certificate)
	if cert == "" {
		return ctx.Config().DefaultAppCertificate(ctx)
	}

	defaultDir := ctx.Config().DefaultAppCertificateDir(ctx)
	pem = defaultDir.Join(ctx, cert+".x509.pem")
	key = defaultDir.Join(ctx, cert+".pk8")
	return pem, key
}

func (a *apexBundle) getOverrideManifestPackageName(ctx android.ModuleContext) string {
	// For VNDK APEXes, check "com.android.vndk" in PRODUCT_MANIFEST_PACKAGE_NAME_OVERRIDES
	// to see if it should be overridden because their <apex name> is dynamically generated
	// according to its VNDK version.
	if a.vndkApex {
		overrideName, overridden := ctx.DeviceConfig().OverrideManifestPackageNameFor(vndkApexName)
		if overridden {
			return overrideName + ".v" + a.vndkVersion(ctx.DeviceConfig())
		}
		return ""
	}
	if a.overridableProperties.Package_name != "" {
		return a.overridableProperties.Package_name
	}
	manifestPackageName, overridden := ctx.DeviceConfig().OverrideManifestPackageNameFor(ctx.ModuleName())
	if overridden {
		return manifestPackageName
	}
	return ""
}

func (a *apexBundle) buildApexDependencyInfo(ctx android.ModuleContext) {
	if a.properties.IsCoverageVariant {
		// Otherwise, we will have duplicated rules for coverage and
		// non-coverage variants of the same APEX
		return
	}

	depInfos := android.DepNameToDepInfoMap{}
	a.WalkPayloadDeps(ctx, func(ctx android.ModuleContext, from blueprint.Module, to android.ApexModule, externalDep bool) bool {
		if from.Name() == to.Name() {
			// This can happen for cc.reuseObjTag. We are not interested in tracking this.
			// As soon as the dependency graph crosses the APEX boundary, don't go further.
			return !externalDep
		}

		// Skip dependencies that are only available to APEXes; they are developed with updatability
		// in mind and don't need manual approval.
		if to.(android.ApexModule).NotAvailableForPlatform() {
			return !externalDep
		}

		depTag := ctx.OtherModuleDependencyTag(to)
		// Check to see if dependency been marked to skip the dependency check
		if skipDepCheck, ok := depTag.(android.SkipApexAllowedDependenciesCheck); ok && skipDepCheck.SkipApexAllowedDependenciesCheck() {
			return !externalDep
		}

		if info, exists := depInfos[to.Name()]; exists {
			if !android.InList(from.Name(), info.From) {
				info.From = append(info.From, from.Name())
			}
			info.IsExternal = info.IsExternal && externalDep
			depInfos[to.Name()] = info
		} else {
			toMinSdkVersion := "(no version)"
			if m, ok := to.(interface {
				MinSdkVersion(ctx android.EarlyModuleContext) android.ApiLevel
			}); ok {
				if v := m.MinSdkVersion(ctx); !v.IsNone() {
					toMinSdkVersion = v.String()
				}
			} else if m, ok := to.(interface{ MinSdkVersion() string }); ok {
				// TODO(b/175678607) eliminate the use of MinSdkVersion returning
				// string
				if v := m.MinSdkVersion(); v != "" {
					toMinSdkVersion = v
				}
			}
			depInfos[to.Name()] = android.ApexModuleDepInfo{
				To:            to.Name(),
				From:          []string{from.Name()},
				IsExternal:    externalDep,
				MinSdkVersion: toMinSdkVersion,
			}
		}

		// As soon as the dependency graph crosses the APEX boundary, don't go further.
		return !externalDep
	})

	a.ApexBundleDepsInfo.BuildDepsInfoLists(ctx, a.MinSdkVersion(ctx).String(), depInfos)

	ctx.Build(pctx, android.BuildParams{
		Rule:   android.Phony,
		Output: android.PathForPhony(ctx, a.Name()+"-deps-info"),
		Inputs: []android.Path{
			a.ApexBundleDepsInfo.FullListPath(),
			a.ApexBundleDepsInfo.FlatListPath(),
		},
	})
}

func (a *apexBundle) buildLintReports(ctx android.ModuleContext) {
	depSetsBuilder := java.NewLintDepSetBuilder()
	for _, fi := range a.filesInfo {
		depSetsBuilder.Transitive(fi.lintDepSets)
	}

	a.lintReports = java.BuildModuleLintReportZips(ctx, depSetsBuilder.Build())
}

func (a *apexBundle) buildCannedFsConfig(ctx android.ModuleContext) android.OutputPath {
	var readOnlyPaths = []string{"apex_manifest.json", "apex_manifest.pb"}
	var executablePaths []string // this also includes dirs
	var appSetDirs []string
	appSetFiles := make(map[string]android.Path)
	for _, f := range a.filesInfo {
		pathInApex := f.path()
		if f.installDir == "bin" || strings.HasPrefix(f.installDir, "bin/") {
			executablePaths = append(executablePaths, pathInApex)
			for _, d := range f.dataPaths {
				readOnlyPaths = append(readOnlyPaths, filepath.Join(f.installDir, d.RelativeInstallPath, d.SrcPath.Rel()))
			}
			for _, s := range f.symlinks {
				executablePaths = append(executablePaths, filepath.Join(f.installDir, s))
			}
		} else if f.class == appSet {
			// base APK
			readOnlyPaths = append(readOnlyPaths, pathInApex)
			// Additional APKs
			appSetDirs = append(appSetDirs, f.installDir)
			appSetFiles[f.installDir] = f.module.(*java.AndroidAppSet).PackedAdditionalOutputs()
		} else {
			readOnlyPaths = append(readOnlyPaths, pathInApex)
		}
		dir := f.installDir
		for !android.InList(dir, executablePaths) && dir != "" {
			executablePaths = append(executablePaths, dir)
			dir, _ = filepath.Split(dir) // move up to the parent
			if len(dir) > 0 {
				// remove trailing slash
				dir = dir[:len(dir)-1]
			}
		}
	}
	sort.Strings(readOnlyPaths)
	sort.Strings(executablePaths)
	sort.Strings(appSetDirs)

	cannedFsConfig := android.PathForModuleOut(ctx, "canned_fs_config")
	builder := android.NewRuleBuilder(pctx, ctx)
	cmd := builder.Command()
	cmd.Text("(")
	cmd.Text("echo '/ 1000 1000 0755';")
	for _, p := range readOnlyPaths {
		cmd.Textf("echo '/%s 1000 1000 0644';", p)
	}
	for _, p := range executablePaths {
		cmd.Textf("echo '/%s 0 2000 0755';", p)
	}
	for _, dir := range appSetDirs {
		cmd.Textf("echo '/%s 0 2000 0755';", dir)
		file := appSetFiles[dir]
		cmd.Text("zipinfo -1").Input(file).Textf(`| sed "s:\(.*\):/%s/\1 1000 1000 0644:";`, dir)
	}
	// Custom fs_config is "appended" to the last so that entries from the file are preferred
	// over default ones set above.
	if a.properties.Canned_fs_config != nil {
		cmd.Text("cat").Input(android.PathForModuleSrc(ctx, *a.properties.Canned_fs_config))
	}
	cmd.Text(")").FlagWithOutput("> ", cannedFsConfig)
	builder.Build("generateFsConfig", fmt.Sprintf("Generating canned fs config for %s", a.BaseModuleName()))

	return cannedFsConfig.OutputPath
}

// Runs apex_sepolicy_tests
//
// $ deapexer list -Z {apex_file} > {file_contexts}
// $ apex_sepolicy_tests -f {file_contexts}
func runApexSepolicyTests(ctx android.ModuleContext, apexFile android.OutputPath) android.Path {
	timestamp := android.PathForModuleOut(ctx, "sepolicy_tests.timestamp")
	ctx.Build(pctx, android.BuildParams{
		Rule:   apexSepolicyTestsRule,
		Input:  apexFile,
		Output: timestamp,
	})
	return timestamp
}