Remove host_snapshot module

Remove host_snapshot implementation which is no longer in use.

Bug: 332986564
Test: soong build succeeded
Change-Id: I96ee4eb319f380d9f85de7f9716e63513838624c
diff --git a/snapshot/Android.bp b/snapshot/Android.bp
index c384f8a..ae1869a 100644
--- a/snapshot/Android.bp
+++ b/snapshot/Android.bp
@@ -14,12 +14,8 @@
     // Source file name convention is to include _snapshot as a
     // file suffix for files that are generating snapshots.
     srcs: [
-        "host_snapshot.go",
         "snapshot_base.go",
         "util.go",
     ],
-    testSrcs: [
-        "host_test.go",
-    ],
     pluginFor: ["soong_build"],
 }
diff --git a/snapshot/host_snapshot.go b/snapshot/host_snapshot.go
deleted file mode 100644
index 1ecab7d..0000000
--- a/snapshot/host_snapshot.go
+++ /dev/null
@@ -1,238 +0,0 @@
-// Copyright 2021 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 snapshot
-
-import (
-	"encoding/json"
-	"fmt"
-	"path/filepath"
-	"sort"
-	"strings"
-
-	"github.com/google/blueprint"
-	"github.com/google/blueprint/proptools"
-
-	"android/soong/android"
-)
-
-//
-// The host_snapshot module creates a snapshot of the modules defined in
-// the deps property.  The modules within the deps property (host tools)
-// are ones that return a valid path via HostToolPath() of the
-// HostToolProvider.  The created snapshot contains the binaries and any
-// transitive PackagingSpecs of the included host tools, along with a JSON
-// meta file.
-//
-// The snapshot is installed into a source tree via
-// development/vendor_snapshot/update.py, the included modules are
-// provided as preferred prebuilts.
-//
-// To determine which tools to include in the host snapshot see
-// host_fake_snapshot.go.
-
-func init() {
-	registerHostBuildComponents(android.InitRegistrationContext)
-}
-
-func registerHostBuildComponents(ctx android.RegistrationContext) {
-	ctx.RegisterModuleType("host_snapshot", hostSnapshotFactory)
-}
-
-// Relative installation path
-type RelativeInstallPath interface {
-	RelativeInstallPath() string
-}
-
-type hostSnapshot struct {
-	android.ModuleBase
-	android.PackagingBase
-
-	outputFile android.OutputPath
-	installDir android.InstallPath
-}
-
-type ProcMacro interface {
-	ProcMacro() bool
-	CrateName() string
-}
-
-func hostSnapshotFactory() android.Module {
-	module := &hostSnapshot{}
-	initHostToolsModule(module)
-	return module
-}
-func initHostToolsModule(module *hostSnapshot) {
-	android.InitPackageModule(module)
-	android.InitAndroidMultiTargetsArchModule(module, android.HostSupported, android.MultilibCommon)
-}
-
-var dependencyTag = struct {
-	blueprint.BaseDependencyTag
-	android.InstallAlwaysNeededDependencyTag
-	android.PackagingItemAlwaysDepTag
-}{}
-
-func (f *hostSnapshot) DepsMutator(ctx android.BottomUpMutatorContext) {
-	f.AddDeps(ctx, dependencyTag)
-}
-func (f *hostSnapshot) installFileName() string {
-	return f.Name() + ".zip"
-}
-
-// Create zipfile with JSON description, notice files... for dependent modules
-func (f *hostSnapshot) CreateMetaData(ctx android.ModuleContext, fileName string) android.OutputPath {
-	var jsonData []SnapshotJsonFlags
-	var metaPaths android.Paths
-
-	installedNotices := make(map[string]bool)
-	metaZipFile := android.PathForModuleOut(ctx, fileName).OutputPath
-
-	// Create JSON file based on the direct dependencies
-	ctx.VisitDirectDeps(func(dep android.Module) {
-		desc := hostJsonDesc(ctx, dep)
-		if desc != nil {
-			jsonData = append(jsonData, *desc)
-		}
-		for _, notice := range dep.EffectiveLicenseFiles() {
-			if _, ok := installedNotices[notice.String()]; !ok {
-				installedNotices[notice.String()] = true
-				noticeOut := android.PathForModuleOut(ctx, "NOTICE_FILES", notice.String()).OutputPath
-				CopyFileToOutputPathRule(pctx, ctx, notice, noticeOut)
-				metaPaths = append(metaPaths, noticeOut)
-			}
-		}
-	})
-	// Sort notice paths and json data for repeatble build
-	sort.Slice(jsonData, func(i, j int) bool {
-		return (jsonData[i].ModuleName < jsonData[j].ModuleName)
-	})
-	sort.Slice(metaPaths, func(i, j int) bool {
-		return (metaPaths[i].String() < metaPaths[j].String())
-	})
-
-	marsh, err := json.Marshal(jsonData)
-	if err != nil {
-		ctx.ModuleErrorf("host snapshot json marshal failure: %#v", err)
-		return android.OutputPath{}
-	}
-
-	jsonZipFile := android.PathForModuleOut(ctx, "host_snapshot.json").OutputPath
-	metaPaths = append(metaPaths, jsonZipFile)
-	rspFile := android.PathForModuleOut(ctx, "host_snapshot.rsp").OutputPath
-	android.WriteFileRule(ctx, jsonZipFile, string(marsh))
-
-	builder := android.NewRuleBuilder(pctx, ctx)
-
-	builder.Command().
-		BuiltTool("soong_zip").
-		FlagWithArg("-C ", android.PathForModuleOut(ctx).OutputPath.String()).
-		FlagWithOutput("-o ", metaZipFile).
-		FlagWithRspFileInputList("-r ", rspFile, metaPaths)
-	builder.Build("zip_meta", fmt.Sprintf("zipping meta data for %s", ctx.ModuleName()))
-
-	return metaZipFile
-}
-
-// Create the host tool zip file
-func (f *hostSnapshot) GenerateAndroidBuildActions(ctx android.ModuleContext) {
-	// Create a zip file for the binaries, and a zip of the meta data, then merge zips
-	depsZipFile := android.PathForModuleOut(ctx, f.Name()+"_deps.zip").OutputPath
-	modsZipFile := android.PathForModuleOut(ctx, f.Name()+"_mods.zip").OutputPath
-	f.outputFile = android.PathForModuleOut(ctx, f.installFileName()).OutputPath
-
-	f.installDir = android.PathForModuleInstall(ctx)
-
-	f.CopyDepsToZip(ctx, f.GatherPackagingSpecs(ctx), depsZipFile)
-
-	builder := android.NewRuleBuilder(pctx, ctx)
-	builder.Command().
-		BuiltTool("zip2zip").
-		FlagWithInput("-i ", depsZipFile).
-		FlagWithOutput("-o ", modsZipFile).
-		Text("**/*:" + proptools.ShellEscape(f.installDir.String()))
-
-	metaZipFile := f.CreateMetaData(ctx, f.Name()+"_meta.zip")
-
-	builder.Command().
-		BuiltTool("merge_zips").
-		Output(f.outputFile).
-		Input(metaZipFile).
-		Input(modsZipFile)
-
-	builder.Build("manifest", fmt.Sprintf("Adding manifest %s", f.installFileName()))
-	ctx.InstallFile(f.installDir, f.installFileName(), f.outputFile)
-
-}
-
-// Implements android.AndroidMkEntriesProvider
-func (f *hostSnapshot) AndroidMkEntries() []android.AndroidMkEntries {
-	return []android.AndroidMkEntries{android.AndroidMkEntries{
-		Class:      "ETC",
-		OutputFile: android.OptionalPathForPath(f.outputFile),
-		DistFiles:  android.MakeDefaultDistFiles(f.outputFile),
-		ExtraEntries: []android.AndroidMkExtraEntriesFunc{
-			func(ctx android.AndroidMkExtraEntriesContext, entries *android.AndroidMkEntries) {
-				entries.SetString("LOCAL_MODULE_PATH", f.installDir.String())
-				entries.SetString("LOCAL_INSTALLED_MODULE_STEM", f.installFileName())
-			},
-		},
-	}}
-}
-
-// Get host tools path and relative install string helpers
-func hostToolPath(m android.Module) android.OptionalPath {
-	if provider, ok := m.(android.HostToolProvider); ok {
-		return provider.HostToolPath()
-	}
-	return android.OptionalPath{}
-
-}
-func hostRelativePathString(m android.Module) string {
-	var outString string
-	if rel, ok := m.(RelativeInstallPath); ok {
-		outString = rel.RelativeInstallPath()
-	}
-	return outString
-}
-
-// Create JSON description for given module, only create descriptions for binary modules
-// and rust_proc_macro modules which provide a valid HostToolPath
-func hostJsonDesc(ctx android.ConfigAndErrorContext, m android.Module) *SnapshotJsonFlags {
-	path := hostToolPath(m)
-	relPath := hostRelativePathString(m)
-	procMacro := false
-	moduleStem := filepath.Base(path.String())
-	crateName := ""
-
-	if pm, ok := m.(ProcMacro); ok && pm.ProcMacro() {
-		procMacro = pm.ProcMacro()
-		moduleStem = strings.TrimSuffix(moduleStem, filepath.Ext(moduleStem))
-		crateName = pm.CrateName()
-	}
-
-	if path.Valid() && path.String() != "" {
-		props := &SnapshotJsonFlags{
-			ModuleStemName:      moduleStem,
-			Filename:            path.String(),
-			Required:            append(m.HostRequiredModuleNames(), m.RequiredModuleNames(ctx)...),
-			RelativeInstallPath: relPath,
-			RustProcMacro:       procMacro,
-			CrateName:           crateName,
-		}
-		props.InitBaseSnapshotProps(m)
-		return props
-	}
-	return nil
-}
diff --git a/snapshot/host_test.go b/snapshot/host_test.go
deleted file mode 100644
index c68fdaf..0000000
--- a/snapshot/host_test.go
+++ /dev/null
@@ -1,131 +0,0 @@
-// Copyright 2021 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 snapshot
-
-import (
-	"path/filepath"
-	"testing"
-
-	"android/soong/android"
-)
-
-// host_snapshot and host-fake-snapshot test functions
-
-type hostTestModule struct {
-	android.ModuleBase
-	props struct {
-		Deps []string
-	}
-}
-
-func hostTestBinOut(bin string) string {
-	return filepath.Join("out", "bin", bin)
-}
-
-func (c *hostTestModule) HostToolPath() android.OptionalPath {
-	return (android.OptionalPathForPath(android.PathForTesting(hostTestBinOut(c.Name()))))
-}
-
-func hostTestModuleFactory() android.Module {
-	m := &hostTestModule{}
-	m.AddProperties(&m.props)
-	android.InitAndroidArchModule(m, android.HostSupported, android.MultilibFirst)
-	return m
-}
-func (m *hostTestModule) GenerateAndroidBuildActions(ctx android.ModuleContext) {
-	builtFile := android.PathForModuleOut(ctx, m.Name())
-	dir := ctx.Target().Arch.ArchType.Multilib
-	installDir := android.PathForModuleInstall(ctx, dir)
-	ctx.InstallFile(installDir, m.Name(), builtFile)
-}
-
-// Common blueprint used for testing
-var hostTestBp = `
-		license_kind {
-			name: "test_notice",
-			conditions: ["notice"],
-		}
-		license {
-			name: "host_test_license",
-			visibility: ["//visibility:public"],
-			license_kinds: [
-				"test_notice"
-			],
-			license_text: [
-				"NOTICE",
-			],
-		}
-		component {
-			name: "foo",
-			deps: ["bar"],
-		}
-		component {
-			name: "bar",
-			licenses: ["host_test_license"],
-		}
-		`
-
-var hostTestModBp = `
-		host_snapshot {
-			name: "test-host-snapshot",
-			deps: [
-				"foo",
-			],
-		}
-		`
-
-var prepareForHostTest = android.GroupFixturePreparers(
-	android.PrepareForTestWithAndroidBuildComponents,
-	android.PrepareForTestWithLicenses,
-	android.FixtureRegisterWithContext(func(ctx android.RegistrationContext) {
-		ctx.RegisterModuleType("component", hostTestModuleFactory)
-	}),
-)
-
-// Prepare for host_snapshot test
-var prepareForHostModTest = android.GroupFixturePreparers(
-	prepareForHostTest,
-	android.FixtureWithRootAndroidBp(hostTestBp+hostTestModBp),
-	android.FixtureRegisterWithContext(func(ctx android.RegistrationContext) {
-		registerHostBuildComponents(ctx)
-	}),
-)
-
-// Prepare for fake host snapshot test disabled
-var prepareForFakeHostTest = android.GroupFixturePreparers(
-	prepareForHostTest,
-	android.FixtureWithRootAndroidBp(hostTestBp),
-)
-
-// Validate that a hostSnapshot object is created containing zip files and JSON file
-// content of zip file is not validated as this is done by PackagingSpecs
-func TestHostSnapshot(t *testing.T) {
-	result := prepareForHostModTest.RunTest(t)
-	t.Helper()
-	ctx := result.TestContext.ModuleForTests("test-host-snapshot", result.Config.BuildOS.String()+"_common")
-	mod := ctx.Module().(*hostSnapshot)
-	if ctx.MaybeOutput("host_snapshot.json").Rule == nil {
-		t.Error("Manifest file not found")
-	}
-	zips := []string{"_deps.zip", "_mods.zip", ".zip"}
-
-	for _, zip := range zips {
-		zFile := mod.Name() + zip
-		if ctx.MaybeOutput(zFile).Rule == nil {
-			t.Error("Zip file ", zFile, "not found")
-		}
-
-	}
-}