Merge "Let shared user checking to be backward-compatible"

import static android.content.pm.PackageManager.INSTALL_FAILED_UPDATE_INCOMPATIBLE;

import static android.content.pm.PackageManager.INSTALL_FAILED_VERSION_DOWNGRADE;

import static android.content.pm.PackageManager.INSTALL_INTERNAL;

import static android.content.pm.PackageManager.INSTALL_PARSE_FAILED_INCONSISTENT_CERTIFICATES;

import static android.content.pm.PackageManager.INSTALL_SUCCEEDED;

import static android.content.pm.PackageManager.INTENT_FILTER_DOMAIN_VERIFICATION_STATUS_ALWAYS;

import static android.content.pm.PackageManager.INTENT_FILTER_DOMAIN_VERIFICATION_STATUS_ALWAYS_ASK;

                        compareSignatures(

                            signatureCheckPs.sharedUser.signatures.mSigningDetails.signatures,

                            pkg.mSigningDetails.signatures) != PackageManager.SIGNATURE_MATCH) {

                        if (SystemProperties.getInt("ro.product.first_api_level", 0) <= 28) {

                            // Mismatched signatures is an error and silently skipping system

                            // packages will likely break the device in unforeseen ways. However,

                            // we allow the device to boot anyway because, prior to P, vendors were

                            // not expecting the platform to crash in this situation.

                            throw new PackageManagerException(

                                    INSTALL_PARSE_FAILED_INCONSISTENT_CERTIFICATES,

                                    "Signature mismatch for shared user: " + pkgSetting.sharedUser);

                        } else {

                            // Treat mismatched signatures on system packages using a shared UID as

                            // fatal for the system overall, rather than just failing to install

                            // whichever package happened to be scanned later.

                        throw new IllegalStateException(

                                "Signature mismatch on system package " + pkg.packageName

                                + " for shared user " + pkgSetting.sharedUser);

                            throw new IllegalStateException("Signature mismatch on system package "

                                + pkg.packageName + " for shared user " + pkgSetting.sharedUser);

                        }

                    }

                    signatureCheckPs.sharedUser.signatures.mSigningDetails = pkg.mSigningDetails;