| /* |
| * Copyright (C) 2016 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 com.android.server.om; |
| |
| import static com.android.server.om.OverlayManagerService.DEBUG; |
| import static com.android.server.om.OverlayManagerService.TAG; |
| |
| import android.annotation.NonNull; |
| import android.content.om.OverlayInfo; |
| import android.content.pm.PackageInfo; |
| import android.os.UserHandle; |
| import android.util.Slog; |
| |
| import com.android.server.pm.Installer.InstallerException; |
| import com.android.server.pm.Installer; |
| |
| import java.io.DataInputStream; |
| import java.io.File; |
| import java.io.FileInputStream; |
| import java.io.IOException; |
| |
| /** |
| * Handle the creation and deletion of idmap files. |
| * |
| * The actual work is performed by the idmap binary, launched through Installer |
| * and installd. |
| * |
| * Note: this class is subclassed in the OMS unit tests, and hence not marked as final. |
| */ |
| class IdmapManager { |
| private final Installer mInstaller; |
| |
| IdmapManager(final Installer installer) { |
| mInstaller = installer; |
| } |
| |
| boolean createIdmap(@NonNull final PackageInfo targetPackage, |
| @NonNull final PackageInfo overlayPackage, int userId) { |
| // unused userId: see comment in OverlayManagerServiceImpl.removeIdmapIfPossible |
| if (DEBUG) { |
| Slog.d(TAG, "create idmap for " + targetPackage.packageName + " and " |
| + overlayPackage.packageName); |
| } |
| final int sharedGid = UserHandle.getSharedAppGid(targetPackage.applicationInfo.uid); |
| final String targetPath = targetPackage.applicationInfo.getBaseCodePath(); |
| final String overlayPath = overlayPackage.applicationInfo.getBaseCodePath(); |
| try { |
| mInstaller.idmap(targetPath, overlayPath, sharedGid); |
| } catch (InstallerException e) { |
| Slog.w(TAG, "failed to generate idmap for " + targetPath + " and " |
| + overlayPath + ": " + e.getMessage()); |
| return false; |
| } |
| return true; |
| } |
| |
| boolean removeIdmap(@NonNull final OverlayInfo oi, final int userId) { |
| // unused userId: see comment in OverlayManagerServiceImpl.removeIdmapIfPossible |
| if (DEBUG) { |
| Slog.d(TAG, "remove idmap for " + oi.baseCodePath); |
| } |
| try { |
| mInstaller.removeIdmap(oi.baseCodePath); |
| } catch (InstallerException e) { |
| Slog.w(TAG, "failed to remove idmap for " + oi.baseCodePath + ": " + e.getMessage()); |
| return false; |
| } |
| return true; |
| } |
| |
| boolean idmapExists(@NonNull final OverlayInfo oi) { |
| // unused OverlayInfo.userId: see comment in OverlayManagerServiceImpl.removeIdmapIfPossible |
| return new File(getIdmapPath(oi.baseCodePath)).isFile(); |
| } |
| |
| boolean idmapExists(@NonNull final PackageInfo overlayPackage, final int userId) { |
| // unused userId: see comment in OverlayManagerServiceImpl.removeIdmapIfPossible |
| return new File(getIdmapPath(overlayPackage.applicationInfo.getBaseCodePath())).isFile(); |
| } |
| |
| private String getIdmapPath(@NonNull final String baseCodePath) { |
| final StringBuilder sb = new StringBuilder("/data/resource-cache/"); |
| sb.append(baseCodePath.substring(1).replace('/', '@')); |
| sb.append("@idmap"); |
| return sb.toString(); |
| } |
| } |