Add PackageInstaller#uninstallExistingPackage

This new API allows an app to be uninstalled silently by any app holding
the DELETE_PACKAGES permission, as long as the app is installed in
another user so won't be fully removed from the device.

Bug: 149601842
Test: atest UninstallExistingPackageTest
Change-Id: I69fe4d1dd4e9da83574b431257f7be6d1ac8b2bb

api/current.txt

@@ -11801,6 +11801,7 @@ package android.content.pm {
     method public void registerSessionCallback(@NonNull android.content.pm.PackageInstaller.SessionCallback, @NonNull android.os.Handler);
     method @RequiresPermission(anyOf={android.Manifest.permission.DELETE_PACKAGES, android.Manifest.permission.REQUEST_DELETE_PACKAGES}) public void uninstall(@NonNull String, @NonNull android.content.IntentSender);
     method @RequiresPermission(anyOf={android.Manifest.permission.DELETE_PACKAGES, android.Manifest.permission.REQUEST_DELETE_PACKAGES}) public void uninstall(@NonNull android.content.pm.VersionedPackage, @NonNull android.content.IntentSender);
+    method @RequiresPermission(android.Manifest.permission.DELETE_PACKAGES) public void uninstallExistingPackage(@NonNull String, @Nullable android.content.IntentSender);
     method public void unregisterSessionCallback(@NonNull android.content.pm.PackageInstaller.SessionCallback);
     method public void updateSessionAppIcon(int, @Nullable android.graphics.Bitmap);
     method public void updateSessionAppLabel(int, @Nullable CharSequence);

core/java/android/content/pm/IPackageInstaller.aidl

@@ -52,6 +52,9 @@ interface IPackageInstaller {
     void uninstall(in VersionedPackage versionedPackage, String callerPackageName, int flags,
             in IntentSender statusReceiver, int userId);
 
+    void uninstallExistingPackage(in VersionedPackage versionedPackage, String callerPackageName,
+            in IntentSender statusReceiver, int userId);
+
     void installExistingPackage(String packageName, int installFlags, int installReason,
             in IntentSender statusReceiver, int userId, in List<String> whiteListedPermissions);
 

core/java/android/content/pm/IPackageManager.aidl

@@ -235,6 +235,16 @@ interface IPackageManager {
     void deletePackageVersioned(in VersionedPackage versionedPackage,
             IPackageDeleteObserver2 observer, int userId, int flags);
 
+    /**
+     * Delete a package for a specific user.
+     *
+     * @param versionedPackage The package to delete.
+     * @param observer a callback to use to notify when the package deletion in finished.
+     * @param userId the id of the user for whom to delete the package
+     */
+    void deleteExistingPackageAsUser(in VersionedPackage versionedPackage,
+            IPackageDeleteObserver2 observer, int userId);
+
     @UnsupportedAppUsage
     String getInstallerPackageName(in String packageName);
 

core/java/android/content/pm/PackageInstaller.java

@@ -723,6 +723,25 @@ public class PackageInstaller {
         }
     }
 
+    /**
+     * Uninstall the given package for the user for which this installer was created if the package
+     * will still exist for other users on the device.
+     *
+     * @param packageName The package to install.
+     * @param statusReceiver Where to deliver the result.
+     */
+    @RequiresPermission(Manifest.permission.DELETE_PACKAGES)
+    public void uninstallExistingPackage(@NonNull String packageName,
+            @Nullable IntentSender statusReceiver) {
+        Objects.requireNonNull(packageName, "packageName cannot be null");
+        try {
+            mInstaller.uninstallExistingPackage(
+                    new VersionedPackage(packageName, PackageManager.VERSION_CODE_HIGHEST),
+                    mInstallerPackageName, statusReceiver, mUserId);
+        } catch (RemoteException e) {
+            throw e.rethrowFromSystemServer();
+        }
+    }
 
     /** {@hide} */
     @SystemApi

services/core/java/com/android/server/pm/PackageInstallerService.java

@@ -936,6 +936,21 @@ public class PackageInstallerService extends IPackageInstaller.Stub implements
         }
     }
 
+    @Override
+    public void uninstallExistingPackage(VersionedPackage versionedPackage,
+            String callerPackageName, IntentSender statusReceiver, int userId) {
+        final int callingUid = Binder.getCallingUid();
+        mContext.enforceCallingOrSelfPermission(Manifest.permission.DELETE_PACKAGES, null);
+        mPermissionManager.enforceCrossUserPermission(callingUid, userId, true, true, "uninstall");
+        if ((callingUid != Process.SHELL_UID) && (callingUid != Process.ROOT_UID)) {
+            mAppOps.checkPackage(callingUid, callerPackageName);
+        }
+
+        final PackageDeleteObserverAdapter adapter = new PackageDeleteObserverAdapter(mContext,
+                statusReceiver, versionedPackage.getPackageName(), false, userId);
+        mPm.deleteExistingPackageAsUser(versionedPackage, adapter.getBinder(), userId);
+    }
+
     @Override
     public void installExistingPackage(String packageName, int installFlags, int installReason,
             IntentSender statusReceiver, int userId, List<String> whiteListedPermissions) {

services/core/java/com/android/server/pm/PackageManagerService.java

@@ -17698,9 +17698,47 @@ public class PackageManagerService extends IPackageManager.Stub
                 new LegacyPackageDeleteObserver(observer).getBinder(), userId, flags);
     }
 
+    @Override
+    public void deleteExistingPackageAsUser(VersionedPackage versionedPackage,
+            final IPackageDeleteObserver2 observer, final int userId) {
+        mContext.enforceCallingOrSelfPermission(
+                android.Manifest.permission.DELETE_PACKAGES, null);
+        Preconditions.checkNotNull(versionedPackage);
+        Preconditions.checkNotNull(observer);
+        final String packageName = versionedPackage.getPackageName();
+        final long versionCode = versionedPackage.getLongVersionCode();
+
+        int installedForUsersCount = 0;
+        synchronized (mLock) {
+            // Normalize package name to handle renamed packages and static libs
+            final String internalPkgName = resolveInternalPackageNameLPr(packageName, versionCode);
+            final PackageSetting ps = mSettings.getPackageLPr(internalPkgName);
+            if (ps != null) {
+                int[] installedUsers = ps.queryInstalledUsers(mUserManager.getUserIds(), true);
+                installedForUsersCount = installedUsers.length;
+            }
+        }
+
+        if (installedForUsersCount > 1) {
+            deletePackageVersionedInternal(versionedPackage, observer, userId, 0, true);
+        } else {
+            try {
+                observer.onPackageDeleted(packageName, PackageManager.DELETE_FAILED_INTERNAL_ERROR,
+                        null);
+            } catch (RemoteException re) {
+            }
+        }
+    }
+
     @Override
     public void deletePackageVersioned(VersionedPackage versionedPackage,
             final IPackageDeleteObserver2 observer, final int userId, final int deleteFlags) {
+        deletePackageVersionedInternal(versionedPackage, observer, userId, deleteFlags, false);
+    }
+
+    private void deletePackageVersionedInternal(VersionedPackage versionedPackage,
+            final IPackageDeleteObserver2 observer, final int userId, final int deleteFlags,
+            final boolean allowSilentUninstall) {
         final int callingUid = Binder.getCallingUid();
         mContext.enforceCallingOrSelfPermission(
                 android.Manifest.permission.DELETE_PACKAGES, null);
@@ -17721,6 +17759,7 @@ public class PackageManagerService extends IPackageManager.Stub
 
         final int uid = Binder.getCallingUid();
         if (!isOrphaned(internalPackageName)
+                && !allowSilentUninstall
                 && !isCallerAllowedToSilentlyUninstall(uid, internalPackageName)) {
             mHandler.post(() -> {
                 try {