PackageManagerServiceUtils.java revision c6494490939768ab86d88abd2e562e0e591d7a8e 
1/*
2 * Copyright (C) 2016 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
17package com.android.server.pm;
18
19import static com.android.server.pm.PackageManagerService.DEBUG_DEXOPT;
20import static com.android.server.pm.PackageManagerService.TAG;
21
22import android.annotation.NonNull;
23import android.app.AppGlobals;
24import android.content.Intent;
25import android.content.pm.PackageParser;
26import android.content.pm.ResolveInfo;
27import android.os.Build;
28import android.os.RemoteException;
29import android.os.UserHandle;
30import android.system.ErrnoException;
31import android.util.ArraySet;
32import android.util.Log;
33import dalvik.system.VMRuntime;
34import libcore.io.Libcore;
35
36import java.io.File;
37import java.io.IOException;
38import java.util.ArrayList;
39import java.util.Collection;
40import java.util.Collections;
41import java.util.LinkedList;
42import java.util.List;
43import java.util.function.Predicate;
44
45/**
46 * Class containing helper methods for the PackageManagerService.
47 *
48 * {@hide}
49 */
50public class PackageManagerServiceUtils {
51    private final static long SEVEN_DAYS_IN_MILLISECONDS = 7 * 24 * 60 * 60 * 1000;
52
53    private static ArraySet<String> getPackageNamesForIntent(Intent intent, int userId) {
54        List<ResolveInfo> ris = null;
55        try {
56            ris = AppGlobals.getPackageManager().queryIntentReceivers(intent, null, 0, userId)
57                    .getList();
58        } catch (RemoteException e) {
59        }
60        ArraySet<String> pkgNames = new ArraySet<String>();
61        if (ris != null) {
62            for (ResolveInfo ri : ris) {
63                pkgNames.add(ri.activityInfo.packageName);
64            }
65        }
66        return pkgNames;
67    }
68
69    // Sort a list of apps by their last usage, most recently used apps first. The order of
70    // packages without usage data is undefined (but they will be sorted after the packages
71    // that do have usage data).
72    public static void sortPackagesByUsageDate(List<PackageParser.Package> pkgs,
73            PackageManagerService packageManagerService) {
74        if (!packageManagerService.isHistoricalPackageUsageAvailable()) {
75            return;
76        }
77
78        Collections.sort(pkgs, (pkg1, pkg2) ->
79                Long.compare(pkg2.getLatestForegroundPackageUseTimeInMills(),
80                        pkg1.getLatestForegroundPackageUseTimeInMills()));
81    }
82
83    // Apply the given {@code filter} to all packages in {@code packages}. If tested positive, the
84    // package will be removed from {@code packages} and added to {@code result} with its
85    // dependencies. If usage data is available, the positive packages will be sorted by usage
86    // data (with {@code sortTemp} as temporary storage).
87    private static void applyPackageFilter(Predicate<PackageParser.Package> filter,
88            Collection<PackageParser.Package> result,
89            Collection<PackageParser.Package> packages,
90            @NonNull List<PackageParser.Package> sortTemp,
91            PackageManagerService packageManagerService) {
92        for (PackageParser.Package pkg : packages) {
93            if (filter.test(pkg)) {
94                sortTemp.add(pkg);
95            }
96        }
97
98        sortPackagesByUsageDate(sortTemp, packageManagerService);
99        packages.removeAll(sortTemp);
100
101        for (PackageParser.Package pkg : sortTemp) {
102            result.add(pkg);
103
104            Collection<PackageParser.Package> deps =
105                    packageManagerService.findSharedNonSystemLibraries(pkg);
106            if (!deps.isEmpty()) {
107                deps.removeAll(result);
108                result.addAll(deps);
109                packages.removeAll(deps);
110            }
111        }
112
113        sortTemp.clear();
114    }
115
116    // Sort apps by importance for dexopt ordering. Important apps are given
117    // more priority in case the device runs out of space.
118    public static List<PackageParser.Package> getPackagesForDexopt(
119            Collection<PackageParser.Package> packages,
120            PackageManagerService packageManagerService) {
121        ArrayList<PackageParser.Package> remainingPkgs = new ArrayList<>(packages);
122        LinkedList<PackageParser.Package> result = new LinkedList<>();
123        ArrayList<PackageParser.Package> sortTemp = new ArrayList<>(remainingPkgs.size());
124
125        // Give priority to core apps.
126        applyPackageFilter((pkg) -> pkg.coreApp, result, remainingPkgs, sortTemp,
127                packageManagerService);
128
129        // Give priority to system apps that listen for pre boot complete.
130        Intent intent = new Intent(Intent.ACTION_PRE_BOOT_COMPLETED);
131        final ArraySet<String> pkgNames = getPackageNamesForIntent(intent, UserHandle.USER_SYSTEM);
132        applyPackageFilter((pkg) -> pkgNames.contains(pkg.packageName), result, remainingPkgs,
133                sortTemp, packageManagerService);
134
135        // Give priority to apps used by other apps.
136        applyPackageFilter((pkg) ->
137                packageManagerService.getDexManager().isUsedByOtherApps(pkg.packageName), result,
138                remainingPkgs, sortTemp, packageManagerService);
139
140        // Filter out packages that aren't recently used, add all remaining apps.
141        // TODO: add a property to control this?
142        Predicate<PackageParser.Package> remainingPredicate;
143        if (!remainingPkgs.isEmpty() && packageManagerService.isHistoricalPackageUsageAvailable()) {
144            if (DEBUG_DEXOPT) {
145                Log.i(TAG, "Looking at historical package use");
146            }
147            // Get the package that was used last.
148            PackageParser.Package lastUsed = Collections.max(remainingPkgs, (pkg1, pkg2) ->
149                    Long.compare(pkg1.getLatestForegroundPackageUseTimeInMills(),
150                            pkg2.getLatestForegroundPackageUseTimeInMills()));
151            if (DEBUG_DEXOPT) {
152                Log.i(TAG, "Taking package " + lastUsed.packageName + " as reference in time use");
153            }
154            long estimatedPreviousSystemUseTime =
155                    lastUsed.getLatestForegroundPackageUseTimeInMills();
156            // Be defensive if for some reason package usage has bogus data.
157            if (estimatedPreviousSystemUseTime != 0) {
158                final long cutoffTime = estimatedPreviousSystemUseTime - SEVEN_DAYS_IN_MILLISECONDS;
159                remainingPredicate =
160                        (pkg) -> pkg.getLatestForegroundPackageUseTimeInMills() >= cutoffTime;
161            } else {
162                // No meaningful historical info. Take all.
163                remainingPredicate = (pkg) -> true;
164            }
165            sortPackagesByUsageDate(remainingPkgs, packageManagerService);
166        } else {
167            // No historical info. Take all.
168            remainingPredicate = (pkg) -> true;
169        }
170        applyPackageFilter(remainingPredicate, result, remainingPkgs, sortTemp,
171                packageManagerService);
172
173        if (DEBUG_DEXOPT) {
174            Log.i(TAG, "Packages to be dexopted: " + packagesToString(result));
175            Log.i(TAG, "Packages skipped from dexopt: " + packagesToString(remainingPkgs));
176        }
177
178        return result;
179    }
180
181    /**
182     * Returns the canonicalized path of {@code path} as per {@code realpath(3)}
183     * semantics.
184     */
185    public static String realpath(File path) throws IOException {
186        try {
187            return Libcore.os.realpath(path.getAbsolutePath());
188        } catch (ErrnoException ee) {
189            throw ee.rethrowAsIOException();
190        }
191    }
192
193    public static String packagesToString(Collection<PackageParser.Package> c) {
194        StringBuilder sb = new StringBuilder();
195        for (PackageParser.Package pkg : c) {
196            if (sb.length() > 0) {
197                sb.append(", ");
198            }
199            sb.append(pkg.packageName);
200        }
201        return sb.toString();
202    }
203
204    /**
205     * Verifies that the given string {@code isa} is a valid supported isa on
206     * the running device.
207     */
208    public static boolean checkISA(String isa) {
209        for (String abi : Build.SUPPORTED_ABIS) {
210            if (VMRuntime.getInstructionSet(abi).equals(isa)) {
211                return true;
212            }
213        }
214        return false;
215    }
216}
217