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      1 /*
      2  * Copyright 2014, The Android Open Source Project
      3  *
      4  * Licensed under the Apache License, Version 2.0 (the "License");
      5  * you may not use this file except in compliance with the License.
      6  * You may obtain a copy of the License at
      7  *
      8  *     http://www.apache.org/licenses/LICENSE-2.0
      9  *
     10  * Unless required by applicable law or agreed to in writing, software
     11  * distributed under the License is distributed on an "AS IS" BASIS,
     12  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
     13  * See the License for the specific language governing permissions and
     14  * limitations under the License.
     15  */
     16 
     17 package com.android.managedprovisioning.task;
     18 
     19 import static com.android.internal.util.Preconditions.checkNotNull;
     20 
     21 import android.content.Context;
     22 import android.content.pm.IPackageDeleteObserver;
     23 import android.content.pm.PackageInfo;
     24 import android.content.pm.PackageManager;
     25 
     26 import com.android.internal.annotations.VisibleForTesting;
     27 import com.android.managedprovisioning.R;
     28 import com.android.managedprovisioning.common.ProvisionLogger;
     29 import com.android.managedprovisioning.model.ProvisioningParams;
     30 import com.android.managedprovisioning.task.nonrequiredapps.NonRequiredAppsLogic;
     31 
     32 import java.util.HashSet;
     33 import java.util.Set;
     34 import java.util.concurrent.atomic.AtomicInteger;
     35 
     36 /**
     37  * Deletes all non-required apps.
     38  *
     39  * This task may be run when a profile (both for managed device and managed profile) is created.
     40  * In that case the firstTimeCreation flag should be true.
     41  *
     42  * It should also be run after a system update with firstTimeCreation false. Note that only
     43  * newly installed system apps will be deleted.
     44  */
     45 public class DeleteNonRequiredAppsTask extends AbstractProvisioningTask {
     46     private final PackageManager mPm;
     47     private final NonRequiredAppsLogic mLogic;
     48 
     49     public DeleteNonRequiredAppsTask(
     50             boolean firstTimeCreation,
     51             Context context,
     52             ProvisioningParams params,
     53             Callback callback) {
     54         this(
     55                 context,
     56                 params,
     57                 callback,
     58                 new NonRequiredAppsLogic(context, firstTimeCreation, params));
     59     }
     60 
     61     @VisibleForTesting
     62     DeleteNonRequiredAppsTask(
     63             Context context,
     64             ProvisioningParams params,
     65             Callback callback,
     66             NonRequiredAppsLogic logic) {
     67         super(context, params, callback);
     68 
     69         mPm = checkNotNull(context.getPackageManager());
     70         mLogic = checkNotNull(logic);
     71     }
     72 
     73     @Override
     74     public void run(int userId) {
     75         Set<String> packagesToDelete = mLogic.getSystemAppsToRemove(userId);
     76         mLogic.maybeTakeSystemAppsSnapshot(userId);
     77 
     78         // Remove all packages that are not currently installed
     79         removeNonInstalledPackages(packagesToDelete, userId);
     80 
     81         if (packagesToDelete.isEmpty()) {
     82             success();
     83             return;
     84         }
     85 
     86         PackageDeleteObserver packageDeleteObserver =
     87                 new PackageDeleteObserver(packagesToDelete.size());
     88         for (String packageName : packagesToDelete) {
     89             ProvisionLogger.logd("Deleting package [" + packageName + "] as user " + userId);
     90             mPm.deletePackageAsUser(packageName, packageDeleteObserver,
     91                     PackageManager.DELETE_SYSTEM_APP, userId);
     92         }
     93     }
     94 
     95     private void removeNonInstalledPackages(Set<String> packages, int userId) {
     96         Set<String> toBeRemoved = new HashSet<>();
     97         for (String packageName : packages) {
     98             try {
     99                 PackageInfo info = mPm.getPackageInfoAsUser(
    100                     packageName, 0 /* default flags */,
    101                     userId);
    102                 if (info == null) {
    103                     toBeRemoved.add(packageName);
    104                 }
    105             } catch (PackageManager.NameNotFoundException e) {
    106                 toBeRemoved.add(packageName);
    107             }
    108         }
    109         packages.removeAll(toBeRemoved);
    110     }
    111 
    112     @Override
    113     public int getStatusMsgId() {
    114         return R.string.progress_delete_non_required_apps;
    115     }
    116 
    117     /**
    118      * Runs the next task when all packages have been deleted or shuts down the activity if package
    119      * deletion fails.
    120      */
    121     class PackageDeleteObserver extends IPackageDeleteObserver.Stub {
    122         private final AtomicInteger mPackageCount = new AtomicInteger(0);
    123 
    124         public PackageDeleteObserver(int packageCount) {
    125             this.mPackageCount.set(packageCount);
    126         }
    127 
    128         @Override
    129         public void packageDeleted(String packageName, int returnCode) {
    130             if (returnCode != PackageManager.DELETE_SUCCEEDED) {
    131                 ProvisionLogger.logw(
    132                         "Could not finish the provisioning: package deletion failed");
    133                 error(0);
    134                 return;
    135             }
    136             int currentPackageCount = mPackageCount.decrementAndGet();
    137             if (currentPackageCount == 0) {
    138                 ProvisionLogger.logi("All non-required system apps with launcher icon, "
    139                         + "and all disallowed apps have been uninstalled.");
    140                 success();
    141             }
    142         }
    143     }
    144 }
    145