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      1 /*
      2  * Copyright (C) 2009 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.internal.content;
     18 
     19 import static android.net.TrafficStats.MB_IN_BYTES;
     20 import static android.os.storage.VolumeInfo.ID_PRIVATE_INTERNAL;
     21 
     22 import android.content.Context;
     23 import android.content.pm.ApplicationInfo;
     24 import android.content.pm.PackageInfo;
     25 import android.content.pm.PackageInstaller.SessionParams;
     26 import android.content.pm.PackageManager;
     27 import android.content.pm.PackageManager.NameNotFoundException;
     28 import android.content.pm.PackageParser.PackageLite;
     29 import android.os.Environment;
     30 import android.os.FileUtils;
     31 import android.os.IBinder;
     32 import android.os.RemoteException;
     33 import android.os.ServiceManager;
     34 import android.os.storage.IStorageManager;
     35 import android.os.storage.StorageManager;
     36 import android.os.storage.StorageResultCode;
     37 import android.os.storage.StorageVolume;
     38 import android.os.storage.VolumeInfo;
     39 import android.provider.Settings;
     40 import android.util.ArraySet;
     41 import android.util.Log;
     42 
     43 import com.android.internal.annotations.VisibleForTesting;
     44 
     45 import libcore.io.IoUtils;
     46 
     47 import java.io.File;
     48 import java.io.FileOutputStream;
     49 import java.io.IOException;
     50 import java.io.InputStream;
     51 import java.util.Collections;
     52 import java.util.Objects;
     53 import java.util.UUID;
     54 import java.util.zip.ZipEntry;
     55 import java.util.zip.ZipFile;
     56 import java.util.zip.ZipOutputStream;
     57 
     58 /**
     59  * Constants used internally between the PackageManager
     60  * and media container service transports.
     61  * Some utility methods to invoke StorageManagerService api.
     62  */
     63 public class PackageHelper {
     64     public static final int RECOMMEND_INSTALL_INTERNAL = 1;
     65     public static final int RECOMMEND_INSTALL_EXTERNAL = 2;
     66     public static final int RECOMMEND_INSTALL_EPHEMERAL = 3;
     67     public static final int RECOMMEND_FAILED_INSUFFICIENT_STORAGE = -1;
     68     public static final int RECOMMEND_FAILED_INVALID_APK = -2;
     69     public static final int RECOMMEND_FAILED_INVALID_LOCATION = -3;
     70     public static final int RECOMMEND_FAILED_ALREADY_EXISTS = -4;
     71     public static final int RECOMMEND_MEDIA_UNAVAILABLE = -5;
     72     public static final int RECOMMEND_FAILED_INVALID_URI = -6;
     73     public static final int RECOMMEND_FAILED_VERSION_DOWNGRADE = -7;
     74 
     75     private static final boolean localLOGV = false;
     76     private static final String TAG = "PackageHelper";
     77     // App installation location settings values
     78     public static final int APP_INSTALL_AUTO = 0;
     79     public static final int APP_INSTALL_INTERNAL = 1;
     80     public static final int APP_INSTALL_EXTERNAL = 2;
     81 
     82     private static TestableInterface sDefaultTestableInterface = null;
     83 
     84     public static IStorageManager getStorageManager() throws RemoteException {
     85         IBinder service = ServiceManager.getService("mount");
     86         if (service != null) {
     87             return IStorageManager.Stub.asInterface(service);
     88         } else {
     89             Log.e(TAG, "Can't get storagemanager service");
     90             throw new RemoteException("Could not contact storagemanager service");
     91         }
     92     }
     93 
     94     public static String createSdDir(long sizeBytes, String cid, String sdEncKey, int uid,
     95             boolean isExternal) {
     96         // Round up to nearest MB, plus another MB for filesystem overhead
     97         final int sizeMb = (int) ((sizeBytes + MB_IN_BYTES) / MB_IN_BYTES) + 1;
     98         try {
     99             IStorageManager storageManager = getStorageManager();
    100 
    101             if (localLOGV)
    102                 Log.i(TAG, "Size of container " + sizeMb + " MB");
    103 
    104             int rc = storageManager.createSecureContainer(cid, sizeMb, "ext4", sdEncKey, uid,
    105                     isExternal);
    106             if (rc != StorageResultCode.OperationSucceeded) {
    107                 Log.e(TAG, "Failed to create secure container " + cid);
    108                 return null;
    109             }
    110             String cachePath = storageManager.getSecureContainerPath(cid);
    111             if (localLOGV) Log.i(TAG, "Created secure container " + cid +
    112                     " at " + cachePath);
    113                 return cachePath;
    114         } catch (RemoteException e) {
    115             Log.e(TAG, "StorageManagerService running?");
    116         }
    117         return null;
    118     }
    119 
    120     public static boolean resizeSdDir(long sizeBytes, String cid, String sdEncKey) {
    121         // Round up to nearest MB, plus another MB for filesystem overhead
    122         final int sizeMb = (int) ((sizeBytes + MB_IN_BYTES) / MB_IN_BYTES) + 1;
    123         try {
    124             IStorageManager storageManager = getStorageManager();
    125             int rc = storageManager.resizeSecureContainer(cid, sizeMb, sdEncKey);
    126             if (rc == StorageResultCode.OperationSucceeded) {
    127                 return true;
    128             }
    129         } catch (RemoteException e) {
    130             Log.e(TAG, "StorageManagerService running?");
    131         }
    132         Log.e(TAG, "Failed to create secure container " + cid);
    133         return false;
    134     }
    135 
    136     public static String mountSdDir(String cid, String key, int ownerUid) {
    137         return mountSdDir(cid, key, ownerUid, true);
    138     }
    139 
    140     public static String mountSdDir(String cid, String key, int ownerUid, boolean readOnly) {
    141         try {
    142             int rc = getStorageManager().mountSecureContainer(cid, key, ownerUid, readOnly);
    143             if (rc != StorageResultCode.OperationSucceeded) {
    144                 Log.i(TAG, "Failed to mount container " + cid + " rc : " + rc);
    145                 return null;
    146             }
    147             return getStorageManager().getSecureContainerPath(cid);
    148         } catch (RemoteException e) {
    149             Log.e(TAG, "StorageManagerService running?");
    150         }
    151         return null;
    152     }
    153 
    154    public static boolean unMountSdDir(String cid) {
    155     try {
    156         int rc = getStorageManager().unmountSecureContainer(cid, true);
    157         if (rc != StorageResultCode.OperationSucceeded) {
    158             Log.e(TAG, "Failed to unmount " + cid + " with rc " + rc);
    159             return false;
    160         }
    161         return true;
    162     } catch (RemoteException e) {
    163         Log.e(TAG, "StorageManagerService running?");
    164     }
    165         return false;
    166    }
    167 
    168    public static boolean renameSdDir(String oldId, String newId) {
    169        try {
    170            int rc = getStorageManager().renameSecureContainer(oldId, newId);
    171            if (rc != StorageResultCode.OperationSucceeded) {
    172                Log.e(TAG, "Failed to rename " + oldId + " to " +
    173                        newId + "with rc " + rc);
    174                return false;
    175            }
    176            return true;
    177        } catch (RemoteException e) {
    178            Log.i(TAG, "Failed ot rename  " + oldId + " to " + newId +
    179                    " with exception : " + e);
    180        }
    181        return false;
    182    }
    183 
    184    public static String getSdDir(String cid) {
    185        try {
    186             return getStorageManager().getSecureContainerPath(cid);
    187         } catch (RemoteException e) {
    188             Log.e(TAG, "Failed to get container path for " + cid +
    189                 " with exception " + e);
    190         }
    191         return null;
    192    }
    193 
    194    public static String getSdFilesystem(String cid) {
    195        try {
    196             return getStorageManager().getSecureContainerFilesystemPath(cid);
    197         } catch (RemoteException e) {
    198             Log.e(TAG, "Failed to get container path for " + cid +
    199                 " with exception " + e);
    200         }
    201         return null;
    202    }
    203 
    204     public static boolean finalizeSdDir(String cid) {
    205         try {
    206             int rc = getStorageManager().finalizeSecureContainer(cid);
    207             if (rc != StorageResultCode.OperationSucceeded) {
    208                 Log.i(TAG, "Failed to finalize container " + cid);
    209                 return false;
    210             }
    211             return true;
    212         } catch (RemoteException e) {
    213             Log.e(TAG, "Failed to finalize container " + cid +
    214                     " with exception " + e);
    215         }
    216         return false;
    217     }
    218 
    219     public static boolean destroySdDir(String cid) {
    220         try {
    221             if (localLOGV) Log.i(TAG, "Forcibly destroying container " + cid);
    222             int rc = getStorageManager().destroySecureContainer(cid, true);
    223             if (rc != StorageResultCode.OperationSucceeded) {
    224                 Log.i(TAG, "Failed to destroy container " + cid);
    225                 return false;
    226             }
    227             return true;
    228         } catch (RemoteException e) {
    229             Log.e(TAG, "Failed to destroy container " + cid +
    230                     " with exception " + e);
    231         }
    232         return false;
    233     }
    234 
    235     public static String[] getSecureContainerList() {
    236         try {
    237             return getStorageManager().getSecureContainerList();
    238         } catch (RemoteException e) {
    239             Log.e(TAG, "Failed to get secure container list with exception" +
    240                     e);
    241         }
    242         return null;
    243     }
    244 
    245    public static boolean isContainerMounted(String cid) {
    246        try {
    247            return getStorageManager().isSecureContainerMounted(cid);
    248        } catch (RemoteException e) {
    249            Log.e(TAG, "Failed to find out if container " + cid + " mounted");
    250        }
    251        return false;
    252    }
    253 
    254     /**
    255      * Extract public files for the single given APK.
    256      */
    257     public static long extractPublicFiles(File apkFile, File publicZipFile)
    258             throws IOException {
    259         final FileOutputStream fstr;
    260         final ZipOutputStream publicZipOutStream;
    261 
    262         if (publicZipFile == null) {
    263             fstr = null;
    264             publicZipOutStream = null;
    265         } else {
    266             fstr = new FileOutputStream(publicZipFile);
    267             publicZipOutStream = new ZipOutputStream(fstr);
    268             Log.d(TAG, "Extracting " + apkFile + " to " + publicZipFile);
    269         }
    270 
    271         long size = 0L;
    272 
    273         try {
    274             final ZipFile privateZip = new ZipFile(apkFile.getAbsolutePath());
    275             try {
    276                 // Copy manifest, resources.arsc and res directory to public zip
    277                 for (final ZipEntry zipEntry : Collections.list(privateZip.entries())) {
    278                     final String zipEntryName = zipEntry.getName();
    279                     if ("AndroidManifest.xml".equals(zipEntryName)
    280                             || "resources.arsc".equals(zipEntryName)
    281                             || zipEntryName.startsWith("res/")) {
    282                         size += zipEntry.getSize();
    283                         if (publicZipFile != null) {
    284                             copyZipEntry(zipEntry, privateZip, publicZipOutStream);
    285                         }
    286                     }
    287                 }
    288             } finally {
    289                 try { privateZip.close(); } catch (IOException e) {}
    290             }
    291 
    292             if (publicZipFile != null) {
    293                 publicZipOutStream.finish();
    294                 publicZipOutStream.flush();
    295                 FileUtils.sync(fstr);
    296                 publicZipOutStream.close();
    297                 FileUtils.setPermissions(publicZipFile.getAbsolutePath(), FileUtils.S_IRUSR
    298                         | FileUtils.S_IWUSR | FileUtils.S_IRGRP | FileUtils.S_IROTH, -1, -1);
    299             }
    300         } finally {
    301             IoUtils.closeQuietly(publicZipOutStream);
    302         }
    303 
    304         return size;
    305     }
    306 
    307     private static void copyZipEntry(ZipEntry zipEntry, ZipFile inZipFile,
    308             ZipOutputStream outZipStream) throws IOException {
    309         byte[] buffer = new byte[4096];
    310         int num;
    311 
    312         ZipEntry newEntry;
    313         if (zipEntry.getMethod() == ZipEntry.STORED) {
    314             // Preserve the STORED method of the input entry.
    315             newEntry = new ZipEntry(zipEntry);
    316         } else {
    317             // Create a new entry so that the compressed len is recomputed.
    318             newEntry = new ZipEntry(zipEntry.getName());
    319         }
    320         outZipStream.putNextEntry(newEntry);
    321 
    322         final InputStream data = inZipFile.getInputStream(zipEntry);
    323         try {
    324             while ((num = data.read(buffer)) > 0) {
    325                 outZipStream.write(buffer, 0, num);
    326             }
    327             outZipStream.flush();
    328         } finally {
    329             IoUtils.closeQuietly(data);
    330         }
    331     }
    332 
    333     public static boolean fixSdPermissions(String cid, int gid, String filename) {
    334         try {
    335             int rc = getStorageManager().fixPermissionsSecureContainer(cid, gid, filename);
    336             if (rc != StorageResultCode.OperationSucceeded) {
    337                 Log.i(TAG, "Failed to fixperms container " + cid);
    338                 return false;
    339             }
    340             return true;
    341         } catch (RemoteException e) {
    342             Log.e(TAG, "Failed to fixperms container " + cid + " with exception " + e);
    343         }
    344         return false;
    345     }
    346 
    347     /**
    348      * A group of external dependencies used in
    349      * {@link #resolveInstallVolume(Context, String, int, long)}. It can be backed by real values
    350      * from the system or mocked ones for testing purposes.
    351      */
    352     public static abstract class TestableInterface {
    353         abstract public StorageManager getStorageManager(Context context);
    354         abstract public boolean getForceAllowOnExternalSetting(Context context);
    355         abstract public boolean getAllow3rdPartyOnInternalConfig(Context context);
    356         abstract public ApplicationInfo getExistingAppInfo(Context context, String packageName);
    357         abstract public File getDataDirectory();
    358 
    359         public boolean fitsOnInternalStorage(Context context, SessionParams params)
    360                 throws IOException {
    361             StorageManager storage = getStorageManager(context);
    362             final UUID target = storage.getUuidForPath(getDataDirectory());
    363             return (params.sizeBytes <= storage.getAllocatableBytes(target,
    364                     translateAllocateFlags(params.installFlags)));
    365         }
    366     }
    367 
    368     private synchronized static TestableInterface getDefaultTestableInterface() {
    369         if (sDefaultTestableInterface == null) {
    370             sDefaultTestableInterface = new TestableInterface() {
    371                 @Override
    372                 public StorageManager getStorageManager(Context context) {
    373                     return context.getSystemService(StorageManager.class);
    374                 }
    375 
    376                 @Override
    377                 public boolean getForceAllowOnExternalSetting(Context context) {
    378                     return Settings.Global.getInt(context.getContentResolver(),
    379                             Settings.Global.FORCE_ALLOW_ON_EXTERNAL, 0) != 0;
    380                 }
    381 
    382                 @Override
    383                 public boolean getAllow3rdPartyOnInternalConfig(Context context) {
    384                     return context.getResources().getBoolean(
    385                             com.android.internal.R.bool.config_allow3rdPartyAppOnInternal);
    386                 }
    387 
    388                 @Override
    389                 public ApplicationInfo getExistingAppInfo(Context context, String packageName) {
    390                     ApplicationInfo existingInfo = null;
    391                     try {
    392                         existingInfo = context.getPackageManager().getApplicationInfo(packageName,
    393                                 PackageManager.MATCH_ANY_USER);
    394                     } catch (NameNotFoundException ignored) {
    395                     }
    396                     return existingInfo;
    397                 }
    398 
    399                 @Override
    400                 public File getDataDirectory() {
    401                     return Environment.getDataDirectory();
    402                 }
    403             };
    404         }
    405         return sDefaultTestableInterface;
    406     }
    407 
    408     @VisibleForTesting
    409     @Deprecated
    410     public static String resolveInstallVolume(Context context, String packageName,
    411             int installLocation, long sizeBytes, TestableInterface testInterface)
    412             throws IOException {
    413         final SessionParams params = new SessionParams(SessionParams.MODE_INVALID);
    414         params.appPackageName = packageName;
    415         params.installLocation = installLocation;
    416         params.sizeBytes = sizeBytes;
    417         return resolveInstallVolume(context, params, testInterface);
    418     }
    419 
    420     /**
    421      * Given a requested {@link PackageInfo#installLocation} and calculated
    422      * install size, pick the actual volume to install the app. Only considers
    423      * internal and private volumes, and prefers to keep an existing package on
    424      * its current volume.
    425      *
    426      * @return the {@link VolumeInfo#fsUuid} to install onto, or {@code null}
    427      *         for internal storage.
    428      */
    429     public static String resolveInstallVolume(Context context, SessionParams params)
    430             throws IOException {
    431         TestableInterface testableInterface = getDefaultTestableInterface();
    432         return resolveInstallVolume(context, params.appPackageName, params.installLocation,
    433                 params.sizeBytes, testableInterface);
    434     }
    435 
    436     @VisibleForTesting
    437     public static String resolveInstallVolume(Context context, SessionParams params,
    438             TestableInterface testInterface) throws IOException {
    439         final boolean forceAllowOnExternal = testInterface.getForceAllowOnExternalSetting(context);
    440         final boolean allow3rdPartyOnInternal =
    441                 testInterface.getAllow3rdPartyOnInternalConfig(context);
    442         // TODO: handle existing apps installed in ASEC; currently assumes
    443         // they'll end up back on internal storage
    444         ApplicationInfo existingInfo = testInterface.getExistingAppInfo(context,
    445                 params.appPackageName);
    446 
    447         final boolean fitsOnInternal = testInterface.fitsOnInternalStorage(context, params);
    448         final StorageManager storageManager =
    449                 testInterface.getStorageManager(context);
    450 
    451         // System apps always forced to internal storage
    452         if (existingInfo != null && existingInfo.isSystemApp()) {
    453             if (fitsOnInternal) {
    454                 return StorageManager.UUID_PRIVATE_INTERNAL;
    455             } else {
    456                 throw new IOException("Not enough space on existing volume "
    457                         + existingInfo.volumeUuid + " for system app " + params.appPackageName
    458                         + " upgrade");
    459             }
    460         }
    461 
    462         // Now deal with non-system apps.
    463         final ArraySet<String> allCandidates = new ArraySet<>();
    464         VolumeInfo bestCandidate = null;
    465         long bestCandidateAvailBytes = Long.MIN_VALUE;
    466         for (VolumeInfo vol : storageManager.getVolumes()) {
    467             boolean isInternalStorage = ID_PRIVATE_INTERNAL.equals(vol.id);
    468             if (vol.type == VolumeInfo.TYPE_PRIVATE && vol.isMountedWritable()
    469                     && (!isInternalStorage || allow3rdPartyOnInternal)) {
    470                 final UUID target = storageManager.getUuidForPath(new File(vol.path));
    471                 final long availBytes = storageManager.getAllocatableBytes(target,
    472                         translateAllocateFlags(params.installFlags));
    473                 if (availBytes >= params.sizeBytes) {
    474                     allCandidates.add(vol.fsUuid);
    475                 }
    476                 if (availBytes >= bestCandidateAvailBytes) {
    477                     bestCandidate = vol;
    478                     bestCandidateAvailBytes = availBytes;
    479                 }
    480             }
    481         }
    482 
    483         // If app expresses strong desire for internal storage, honor it
    484         if (!forceAllowOnExternal
    485                 && params.installLocation == PackageInfo.INSTALL_LOCATION_INTERNAL_ONLY) {
    486             if (existingInfo != null && !Objects.equals(existingInfo.volumeUuid,
    487                     StorageManager.UUID_PRIVATE_INTERNAL)) {
    488                 throw new IOException("Cannot automatically move " + params.appPackageName
    489                         + " from " + existingInfo.volumeUuid + " to internal storage");
    490             }
    491 
    492             if (!allow3rdPartyOnInternal) {
    493                 throw new IOException("Not allowed to install non-system apps on internal storage");
    494             }
    495 
    496             if (fitsOnInternal) {
    497                 return StorageManager.UUID_PRIVATE_INTERNAL;
    498             } else {
    499                 throw new IOException("Requested internal only, but not enough space");
    500             }
    501         }
    502 
    503         // If app already exists somewhere, we must stay on that volume
    504         if (existingInfo != null) {
    505             if (Objects.equals(existingInfo.volumeUuid, StorageManager.UUID_PRIVATE_INTERNAL)
    506                     && fitsOnInternal) {
    507                 return StorageManager.UUID_PRIVATE_INTERNAL;
    508             } else if (allCandidates.contains(existingInfo.volumeUuid)) {
    509                 return existingInfo.volumeUuid;
    510             } else {
    511                 throw new IOException("Not enough space on existing volume "
    512                         + existingInfo.volumeUuid + " for " + params.appPackageName + " upgrade");
    513             }
    514         }
    515 
    516         // We're left with new installations with either preferring external or auto, so just pick
    517         // volume with most space
    518         if (bestCandidate != null) {
    519             return bestCandidate.fsUuid;
    520         } else {
    521             throw new IOException("No special requests, but no room on allowed volumes. "
    522                 + " allow3rdPartyOnInternal? " + allow3rdPartyOnInternal);
    523         }
    524     }
    525 
    526     public static boolean fitsOnInternal(Context context, SessionParams params) throws IOException {
    527         final StorageManager storage = context.getSystemService(StorageManager.class);
    528         final UUID target = storage.getUuidForPath(Environment.getDataDirectory());
    529         return (params.sizeBytes <= storage.getAllocatableBytes(target,
    530                 translateAllocateFlags(params.installFlags)));
    531     }
    532 
    533     public static boolean fitsOnExternal(Context context, SessionParams params) {
    534         final StorageManager storage = context.getSystemService(StorageManager.class);
    535         final StorageVolume primary = storage.getPrimaryVolume();
    536         return (params.sizeBytes > 0) && !primary.isEmulated()
    537                 && Environment.MEDIA_MOUNTED.equals(primary.getState())
    538                 && params.sizeBytes <= storage.getStorageBytesUntilLow(primary.getPathFile());
    539     }
    540 
    541     @Deprecated
    542     public static int resolveInstallLocation(Context context, String packageName,
    543             int installLocation, long sizeBytes, int installFlags) {
    544         final SessionParams params = new SessionParams(SessionParams.MODE_INVALID);
    545         params.appPackageName = packageName;
    546         params.installLocation = installLocation;
    547         params.sizeBytes = sizeBytes;
    548         params.installFlags = installFlags;
    549         try {
    550             return resolveInstallLocation(context, params);
    551         } catch (IOException e) {
    552             throw new IllegalStateException(e);
    553         }
    554     }
    555 
    556     /**
    557      * Given a requested {@link PackageInfo#installLocation} and calculated
    558      * install size, pick the actual location to install the app.
    559      */
    560     public static int resolveInstallLocation(Context context, SessionParams params)
    561             throws IOException {
    562         ApplicationInfo existingInfo = null;
    563         try {
    564             existingInfo = context.getPackageManager().getApplicationInfo(params.appPackageName,
    565                     PackageManager.MATCH_ANY_USER);
    566         } catch (NameNotFoundException ignored) {
    567         }
    568 
    569         final int prefer;
    570         final boolean checkBoth;
    571         boolean ephemeral = false;
    572         if ((params.installFlags & PackageManager.INSTALL_INSTANT_APP) != 0) {
    573             prefer = RECOMMEND_INSTALL_INTERNAL;
    574             ephemeral = true;
    575             checkBoth = false;
    576         } else if ((params.installFlags & PackageManager.INSTALL_INTERNAL) != 0) {
    577             prefer = RECOMMEND_INSTALL_INTERNAL;
    578             checkBoth = false;
    579         } else if ((params.installFlags & PackageManager.INSTALL_EXTERNAL) != 0) {
    580             prefer = RECOMMEND_INSTALL_EXTERNAL;
    581             checkBoth = false;
    582         } else if (params.installLocation == PackageInfo.INSTALL_LOCATION_INTERNAL_ONLY) {
    583             prefer = RECOMMEND_INSTALL_INTERNAL;
    584             checkBoth = false;
    585         } else if (params.installLocation == PackageInfo.INSTALL_LOCATION_PREFER_EXTERNAL) {
    586             prefer = RECOMMEND_INSTALL_EXTERNAL;
    587             checkBoth = true;
    588         } else if (params.installLocation == PackageInfo.INSTALL_LOCATION_AUTO) {
    589             // When app is already installed, prefer same medium
    590             if (existingInfo != null) {
    591                 // TODO: distinguish if this is external ASEC
    592                 if ((existingInfo.flags & ApplicationInfo.FLAG_EXTERNAL_STORAGE) != 0) {
    593                     prefer = RECOMMEND_INSTALL_EXTERNAL;
    594                 } else {
    595                     prefer = RECOMMEND_INSTALL_INTERNAL;
    596                 }
    597             } else {
    598                 prefer = RECOMMEND_INSTALL_INTERNAL;
    599             }
    600             checkBoth = true;
    601         } else {
    602             prefer = RECOMMEND_INSTALL_INTERNAL;
    603             checkBoth = false;
    604         }
    605 
    606         boolean fitsOnInternal = false;
    607         if (checkBoth || prefer == RECOMMEND_INSTALL_INTERNAL) {
    608             fitsOnInternal = fitsOnInternal(context, params);
    609         }
    610 
    611         boolean fitsOnExternal = false;
    612         if (checkBoth || prefer == RECOMMEND_INSTALL_EXTERNAL) {
    613             fitsOnExternal = fitsOnExternal(context, params);
    614         }
    615 
    616         if (prefer == RECOMMEND_INSTALL_INTERNAL) {
    617             // The ephemeral case will either fit and return EPHEMERAL, or will not fit
    618             // and will fall through to return INSUFFICIENT_STORAGE
    619             if (fitsOnInternal) {
    620                 return (ephemeral)
    621                         ? PackageHelper.RECOMMEND_INSTALL_EPHEMERAL
    622                         : PackageHelper.RECOMMEND_INSTALL_INTERNAL;
    623             }
    624         } else if (prefer == RECOMMEND_INSTALL_EXTERNAL) {
    625             if (fitsOnExternal) {
    626                 return PackageHelper.RECOMMEND_INSTALL_EXTERNAL;
    627             }
    628         }
    629 
    630         if (checkBoth) {
    631             if (fitsOnInternal) {
    632                 return PackageHelper.RECOMMEND_INSTALL_INTERNAL;
    633             } else if (fitsOnExternal) {
    634                 return PackageHelper.RECOMMEND_INSTALL_EXTERNAL;
    635             }
    636         }
    637 
    638         return PackageHelper.RECOMMEND_FAILED_INSUFFICIENT_STORAGE;
    639     }
    640 
    641     public static long calculateInstalledSize(PackageLite pkg, boolean isForwardLocked,
    642             String abiOverride) throws IOException {
    643         NativeLibraryHelper.Handle handle = null;
    644         try {
    645             handle = NativeLibraryHelper.Handle.create(pkg);
    646             return calculateInstalledSize(pkg, handle, isForwardLocked, abiOverride);
    647         } finally {
    648             IoUtils.closeQuietly(handle);
    649         }
    650     }
    651 
    652     public static long calculateInstalledSize(PackageLite pkg, NativeLibraryHelper.Handle handle,
    653             boolean isForwardLocked, String abiOverride) throws IOException {
    654         long sizeBytes = 0;
    655 
    656         // Include raw APKs, and possibly unpacked resources
    657         for (String codePath : pkg.getAllCodePaths()) {
    658             final File codeFile = new File(codePath);
    659             sizeBytes += codeFile.length();
    660 
    661             if (isForwardLocked) {
    662                 sizeBytes += PackageHelper.extractPublicFiles(codeFile, null);
    663             }
    664         }
    665 
    666         // Include all relevant native code
    667         sizeBytes += NativeLibraryHelper.sumNativeBinariesWithOverride(handle, abiOverride);
    668 
    669         return sizeBytes;
    670     }
    671 
    672     public static String replaceEnd(String str, String before, String after) {
    673         if (!str.endsWith(before)) {
    674             throw new IllegalArgumentException(
    675                     "Expected " + str + " to end with " + before);
    676         }
    677         return str.substring(0, str.length() - before.length()) + after;
    678     }
    679 
    680     public static int translateAllocateFlags(int installFlags) {
    681         if ((installFlags & PackageManager.INSTALL_ALLOCATE_AGGRESSIVE) != 0) {
    682             return StorageManager.FLAG_ALLOCATE_AGGRESSIVE;
    683         } else {
    684             return 0;
    685         }
    686     }
    687 }
    688