Add backup/reserved files in new permission subsystem (fa6d439a) · Commits · e / os / android_frameworks_base

services/permission/java/com/android/server/permission/access/AccessPersistence.kt

+4 −4

Original line number	Diff line number	Diff line
		@@ -30,9 +30,9 @@ import com.android.modules.utils.BinaryXmlSerializer
		import com.android.server.permission.access.collection.* // ktlint-disable no-wildcard-imports
		import com.android.server.permission.access.util.PermissionApex
		import com.android.server.permission.access.util.parseBinaryXml
		import com.android.server.permission.access.util.read
		import com.android.server.permission.access.util.readWithReserveCopy
		import com.android.server.permission.access.util.serializeBinaryXml
		import com.android.server.permission.access.util.writeInlined
		import com.android.server.permission.access.util.writeWithReserveCopy
		import java.io.File
		import java.io.FileNotFoundException

		@@ -100,7 +100,7 @@ class AccessPersistence(
		*/
		private inline fun File.parse(block: BinaryXmlPullParser.() -> Unit): Boolean =
		try {
		AtomicFile(this).read { it.parseBinaryXml(block) }
		AtomicFile(this).readWithReserveCopy { it.parseBinaryXml(block) }
		true
		} catch (e: FileNotFoundException) {
		Log.i(LOG_TAG, "$this not found")
		@@ -179,7 +179,7 @@ class AccessPersistence(

		private inline fun File.serialize(block: BinaryXmlSerializer.() -> Unit) {
		try {
		AtomicFile(this).writeInlined { it.serializeBinaryXml(block) }
		AtomicFile(this).writeWithReserveCopy { it.serializeBinaryXml(block) }
		} catch (e: Exception) {
		Log.e(LOG_TAG, "Failed to serialize $this", e)
		}

services/permission/java/com/android/server/permission/access/util/AtomicFileExtensions.kt

+40 −3

Original line number	Diff line number	Diff line
		@@ -16,17 +16,54 @@

		package com.android.server.permission.access.util

		import android.os.FileUtils
		import android.util.AtomicFile
		import android.util.Log
		import java.io.File
		import java.io.FileInputStream
		import java.io.FileNotFoundException
		import java.io.FileOutputStream
		import java.io.IOException

		/**
		* Read from an [AtomicFile] and close everything safely when done.
		* Read from an [AtomicFile], fallback to reserve file to read the data.
		*/
		@Throws(IOException::class)
		inline fun AtomicFile.read(block: (FileInputStream) -> Unit) {
		@Throws(Exception::class)
		inline fun AtomicFile.readWithReserveCopy(block: (FileInputStream) -> Unit) {
		try {
		openRead().use(block)
		} catch (e: FileNotFoundException) {
		throw e
		} catch (e: Exception) {
		Log.wtf("AccessPersistence", "Failed to read $this", e)
		val reserveFile = File(baseFile.parentFile, baseFile.name + ".reservecopy")
		try {
		AtomicFile(reserveFile).openRead().use(block)
		} catch (e2: Exception) {
		Log.e("AccessPersistence", "Failed to read $reserveFile", e2)
		throw e
		}
		}
		}

		/**
		* Write to actual file and reserve file.
		*/
		@Throws(IOException::class)
		inline fun AtomicFile.writeWithReserveCopy(block: (FileOutputStream) -> Unit) {
		val reserveFile = File(baseFile.parentFile, baseFile.name + ".reservecopy")
		reserveFile.delete()
		writeInlined(block)
		try {
		FileInputStream(baseFile).use { inputStream ->
		FileOutputStream(reserveFile).use { outputStream ->
		FileUtils.copy(inputStream, outputStream)
		outputStream.fd.sync()
		}
		}
		} catch (e: Exception) {
		Log.e("AccessPersistence", "Failed to write $reserveFile", e)
		}
		}

		/**