Flush logs before exiting the app.

Signal/src/AppDelegate.m

@@ -52,6 +52,8 @@ @implementation AppDelegate
 
 - (void)applicationDidEnterBackground:(UIApplication *)application {
     DDLogWarn(@"%@ applicationDidEnterBackground.", self.tag);
+
+    [DDLog flushLog];
 }
 
 - (void)applicationWillEnterForeground:(UIApplication *)application {
@@ -68,6 +70,8 @@ - (void)applicationDidReceiveMemoryWarning:(UIApplication *)application
 - (void)applicationWillTerminate:(UIApplication *)application
 {
     DDLogWarn(@"%@ applicationWillTerminate.", self.tag);
+
+    [DDLog flushLog];
 }
 
 - (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions {
@@ -312,6 +316,8 @@ - (void)applicationWillResignActive:(UIApplication *)application {
       [application endBackgroundTask:bgTask];
       bgTask = UIBackgroundTaskInvalid;
     });
+
+    [DDLog flushLog];
 }
 
 - (void)application:(UIApplication *)application
@@ -543,6 +549,7 @@ - (void)verifyDBKeysAvailableBeforeBackgroundLaunch
 
     if (![TSStorageManager isDatabasePasswordAccessible]) {
         DDLogInfo(@"%@ exiting because we are in the background and the database password is not accessible.", self.tag);
+        [DDLog flushLog];
         exit(0);
     }
 }

Signal/src/contact/OWSContactsManager.m

@@ -159,7 +159,8 @@ + (void)blockingContactDialog {
                 addAction:[UIAlertAction actionWithTitle:NSLocalizedString(@"ADDRESSBOOK_RESTRICTED_ALERT_BUTTON", nil)
                                                    style:UIAlertActionStyleDefault
                                                  handler:^(UIAlertAction *action) {
-                                                   exit(0);
+                                                     [DDLog flushLog];
+                                                     exit(0);
                                                  }]];
 
             [[UIApplication sharedApplication]

Signal/src/environment/Environment.m

@@ -312,10 +312,26 @@ + (void)messageGroup:(TSGroupThread *)groupThread {
 }
 
 + (void)resetAppData {
+    // This _should_ be wiped out below.
+    DDLogError(@"%@ %s", self.tag, __PRETTY_FUNCTION__);
+    [DDLog flushLog];
+
     [[TSStorageManager sharedManager] resetSignalStorage];
     [Environment.preferences clear];
     [DebugLogger.sharedLogger wipeLogs];
     exit(0);
 }
 
+#pragma mark - Logging
+
++ (NSString *)tag
+{
+    return [NSString stringWithFormat:@"[%@]", self.class];
+}
+
+- (NSString *)tag
+{
+    return self.class.tag;
+}
+
 @end

Signal/src/environment/VersionMigrations.m

@@ -59,6 +59,7 @@ + (void)performUpdateCheck
         UIAlertAction *quitAction = [UIAlertAction actionWithTitle:@"Quit"
                                                              style:UIAlertActionStyleDefault
                                                            handler:^(UIAlertAction *_Nonnull action) {
+                                                               [DDLog flushLog];
                                                                exit(0);
                                                            }];
         [alertController addAction:quitAction];