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// 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"
"sort"
"android/soong/android"
)
// This file contains singletons to capture snapshots. This singleton will generate snapshot of each target
// image, and capturing snapshot module will be delegated to each module which implements GenerateSnapshotAction
// function and register with RegisterSnapshotAction.
var pctx = android.NewPackageContext("android/soong/snapshot")
func init() {
pctx.Import("android/soong/android")
}
type SnapshotSingleton struct {
// Name, e.g., "vendor", "recovery", "ramdisk".
name string
// Make variable that points to the snapshot file, e.g.,
// "SOONG_RECOVERY_SNAPSHOT_ZIP".
makeVar string
// Path to the snapshot zip file.
snapshotZipFile android.OptionalPath
// Implementation of the image interface specific to the image
// associated with this snapshot (e.g., specific to the vendor image,
// recovery image, etc.).
Image SnapshotImage
// Whether this singleton is for fake snapshot or not.
// Fake snapshot is a snapshot whose prebuilt binaries and headers are empty.
// It is much faster to generate, and can be used to inspect dependencies.
Fake bool
}
// The output files to be included in the snapshot.
type SnapshotPaths struct {
// All files to be included in the snapshot
OutputFiles android.Paths
// Notice files of the snapshot output files
NoticeFiles android.Paths
}
// Interface of function to capture snapshot from each module
// Returns snapshot ouputs and notice files.
type GenerateSnapshotAction func(snapshot SnapshotSingleton, ctx android.SingletonContext, snapshotArchDir string) SnapshotPaths
var snapshotActionList []GenerateSnapshotAction
// Register GenerateSnapshotAction function so it can be called while generating snapshot
func RegisterSnapshotAction(x GenerateSnapshotAction) {
snapshotActionList = append(snapshotActionList, x)
}
func (c *SnapshotSingleton) GenerateBuildActions(ctx android.SingletonContext) {
if !c.Image.shouldGenerateSnapshot(ctx) {
return
}
var snapshotOutputs android.Paths
// Snapshot zipped artifacts will be captured under {SNAPSHOT_ARCH} directory
snapshotDir := c.name + "-snapshot"
if c.Fake {
// If this is a fake snapshot singleton, place all files under fake/ subdirectory to avoid
// collision with real snapshot files
snapshotDir = filepath.Join("fake", snapshotDir)
}
snapshotArchDir := filepath.Join(snapshotDir, ctx.DeviceConfig().DeviceArch())
noticeDir := filepath.Join(snapshotArchDir, "NOTICE_FILES")
installedNotices := make(map[string]bool)
for _, f := range snapshotActionList {
snapshotPaths := f(*c, ctx, snapshotArchDir)
snapshotOutputs = append(snapshotOutputs, snapshotPaths.OutputFiles...)
for _, notice := range snapshotPaths.NoticeFiles {
if _, ok := installedNotices[notice.String()]; !ok {
installedNotices[notice.String()] = true
snapshotOutputs = append(snapshotOutputs, CopyFileRule(
pctx, ctx, notice, filepath.Join(noticeDir, notice.String())))
}
}
}
// All artifacts are ready. Sort them to normalize ninja and then zip.
sort.Slice(snapshotOutputs, func(i, j int) bool {
return snapshotOutputs[i].String() < snapshotOutputs[j].String()
})
zipPath := android.PathForOutput(
ctx,
snapshotDir,
c.name+"-"+ctx.Config().DeviceName()+".zip")
zipRule := android.NewRuleBuilder(pctx, ctx)
// filenames in rspfile from FlagWithRspFileInputList might be single-quoted. Remove it with tr
snapshotOutputList := android.PathForOutput(
ctx,
snapshotDir,
c.name+"-"+ctx.Config().DeviceName()+"_list")
rspFile := snapshotOutputList.ReplaceExtension(ctx, "rsp")
zipRule.Command().
Text("tr").
FlagWithArg("-d ", "\\'").
FlagWithRspFileInputList("< ", rspFile, snapshotOutputs).
FlagWithOutput("> ", snapshotOutputList)
zipRule.Temporary(snapshotOutputList)
zipRule.Command().
BuiltTool("soong_zip").
FlagWithOutput("-o ", zipPath).
FlagWithArg("-C ", android.PathForOutput(ctx, snapshotDir).String()).
FlagWithInput("-l ", snapshotOutputList)
zipRule.Build(zipPath.String(), c.name+" snapshot "+zipPath.String())
zipRule.DeleteTemporaryFiles()
c.snapshotZipFile = android.OptionalPathForPath(zipPath)
}
func (c *SnapshotSingleton) MakeVars(ctx android.MakeVarsContext) {
ctx.Strict(
c.makeVar,
c.snapshotZipFile.String())
}
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