Fix crash loop due to broken packages.xml around updated-package

Symptom:
Device cannot boot up due to NPE during package scan.

Root Cause:
/data/system/packages.xml is broken with an unexpected <updated-package>
element even though there's no corresponding <package> element.
When a system apk is installed, the system apk is registered
as a <package> element in the packages.xml.
When updated with a newer apk in /data, the data apk is registered as
a <package> and the system apk is moved to <updated-package>.
If a user triggers "Uninstall updates" but the device cannot complete
uninstallation processing due to any critical problem like system
freeze, the package.xml can be broken because the <package> for the
data apk is removed once but the <updated-package> for the system apk
remains wrongly.

Solution:
In this case, this change ignores the inconsistent <updated-package> and
installs the system apk as non-updated system app.

Test: forcibly stop "Uninstall updates" processing with JDB
      as described in b/143251299 and check system restart behavior
Bug: 143251299
Change-Id: I48b6957d19f5d60d08d2e5ba48fa1d7bf42fdcfe

1 files changed, 10 insertions, 0 deletions

diff --git a/services/core/java/com/android/server/pm/PackageManagerService.java b/services/core/java/com/android/server/pm/PackageManagerService.java
index 0460a80b1dc0..461743e9ba53 100644
--- a/services/core/java/com/android/server/pm/PackageManagerService.java
+++ b/services/core/java/com/android/server/pm/PackageManagerService.java
@@ -9334,6 +9334,16 @@ public class PackageManagerService extends IPackageManager.Stub
             pkgSetting = originalPkgSetting == null ? installedPkgSetting : originalPkgSetting;
             pkgAlreadyExists = pkgSetting != null;
             final String disabledPkgName = pkgAlreadyExists ? pkgSetting.name : pkg.packageName;
+            if (scanSystemPartition && !pkgAlreadyExists
+                    && mSettings.getDisabledSystemPkgLPr(disabledPkgName) != null) {
+                // The updated-package data for /system apk remains inconsistently
+                // after the package data for /data apk is lost accidentally.
+                // To recover it, enable /system apk and install it as non-updated system app.
+                Slog.w(TAG, "Inconsistent package setting of updated system app for "
+                        + disabledPkgName + ". To recover it, enable the system app"
+                        + "and install it as non-updated system app.");
+                mSettings.removeDisabledSystemPackageLPw(disabledPkgName);
+            }
             disabledPkgSetting = mSettings.getDisabledSystemPkgLPr(disabledPkgName);
             isSystemPkgUpdated = disabledPkgSetting != null;