From efc609577ffbbc65464e1c739ab63d26abc54a5d Mon Sep 17 00:00:00 2001
From: James Turner <zakalawe@mac.com>
Date: Fri, 5 Oct 2018 10:40:35 +0100
Subject: [PATCH] Packages: check for existing update when scheduling

This is fixing an issue identified in the launcher in a secondary way,
to ensure if another user of the API tries to schedule an already
scheduled package, we ignore the second request.
---
 simgear/package/Root.cxx | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/simgear/package/Root.cxx b/simgear/package/Root.cxx
index d7e06b4f..b207af2c 100644
--- a/simgear/package/Root.cxx
+++ b/simgear/package/Root.cxx
@@ -594,6 +594,12 @@ void Root::scheduleToUpdate(InstallRef aInstall)
     if (!aInstall) {
         throw sg_exception("missing argument to scheduleToUpdate");
     }
+    
+    auto it = std::find(d->updateDeque.begin(), d->updateDeque.end(), aInstall);
+    if (it != d->updateDeque.end()) {
+        // already scheduled to update
+        return;
+    }
 
     PackageList deps = aInstall->package()->dependencies();
     for (Package* dep : deps) {