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Expand apps' control over the settings restore process

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Applications can now specify two more aspects of the restore process:  whether
they need to run with their own custom Application subclass rather than being
launched in the usual restricted mode during restore, and whether it's okay for
the backup manager to kill the app process once restore has completed.  The new
manifest attributes for these are, respectively, android:restoreNeedsApplication
and android:killAfterRestore.

If unspecified in the manifest, restoreNeedsApplication is false, and
killAfterRestore is true.

In order to support kill-after-restore cleanly, this change also adds a new
system-process-only interface to the Activity Manager, which will schedule a
"commit suicide" event on the target app's main thread looper.

The framework backup agents have been given the appropriate new backup
attributes as well.
This commit is contained in:
Christopher Tate
2009-09-01 20:32:49 -07:00
parent c937b5ce4f
commit 5e1ab335e6
14 changed files with 192 additions and 12 deletions
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37
services/java/com/android/server/BackupManagerService.java
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@@ -557,7 +557,12 @@ class BackupManagerService extends IBackupManager.Stub {
Log.v(TAG, "Adding " + targetPkgs.size() + " backup participants:");
for (PackageInfo p : targetPkgs) {
Log.v(TAG, " " + p + " agent=" + p.applicationInfo.backupAgentName
+ " uid=" + p.applicationInfo.uid);
+ " uid=" + p.applicationInfo.uid
+ " killAfterRestore="
+ (((p.applicationInfo.flags & ApplicationInfo.FLAG_KILL_AFTER_RESTORE) != 0) ? "true" : "false")
+ " restoreNeedsApplication="
+ (((p.applicationInfo.flags & ApplicationInfo.FLAG_RESTORE_NEEDS_APPLICATION) != 0) ? "true" : "false")
);
}
}
@@ -1244,11 +1249,21 @@ class BackupManagerService extends IBackupManager.Stub {
+ "] is compatible with installed version ["
+ packageInfo.versionCode + "]");
// Now perform the actual restore
// Now perform the actual restore: first clear the app's data
// if appropriate
clearApplicationDataSynchronous(packageName);
// Then set up and bind the agent (with a restricted Application object
// unless the application says otherwise)
boolean useRealApp = (packageInfo.applicationInfo.flags
& ApplicationInfo.FLAG_RESTORE_NEEDS_APPLICATION) != 0;
if (DEBUG && useRealApp) {
Log.v(TAG, "agent requires real Application subclass for restore");
}
IBackupAgent agent = bindToAgentSynchronous(
packageInfo.applicationInfo,
IApplicationThread.BACKUP_MODE_RESTORE);
(useRealApp ? IApplicationThread.BACKUP_MODE_INCREMENTAL
: IApplicationThread.BACKUP_MODE_RESTORE));
if (agent == null) {
Log.w(TAG, "Can't find backup agent for " + packageName);
EventLog.writeEvent(RESTORE_AGENT_FAILURE_EVENT, packageName,
@@ -1256,12 +1271,26 @@ class BackupManagerService extends IBackupManager.Stub {
continue;
}
// And then finally run the restore on this agent
try {
processOneRestore(packageInfo, metaInfo.versionCode, agent);
++count;
} finally {
// unbind even on timeout or failure, just in case
// unbind and tidy up even on timeout or failure, just in case
mActivityManager.unbindBackupAgent(packageInfo.applicationInfo);
// The agent was probably running with a stub Application object,
// which isn't a valid run mode for the main app logic. Shut
// down the app so that next time it's launched, it gets the
// usual full initialization.
if ((packageInfo.applicationInfo.flags
& ApplicationInfo.FLAG_KILL_AFTER_RESTORE) != 0) {
if (DEBUG) Log.d(TAG, "Restore complete, killing host process of "
+ packageInfo.applicationInfo.processName);
mActivityManager.killApplicationProcess(
packageInfo.applicationInfo.processName,
packageInfo.applicationInfo.uid);
}
}
}