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When linking two groups, and then deleting the combined group: delete *all* of the combined group's prims, including those that came from the second subgroup

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This fixes http://opensimulator.org/mantis/view.php?id=6175
This commit is contained in:
Oren Hurvitz
2013-10-24 11:18:15 +03:00
parent b0cb0ec02f
commit 62b3bdf0fc
3 changed files with 41 additions and 17 deletions
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38
OpenSim/Region/Framework/Scenes/SceneObjectGroup.cs
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@@ -150,12 +150,27 @@ namespace OpenSim.Region.Framework.Scenes
get { return m_hasGroupChanged; }
}
private bool m_groupContainsForeignPrims = false;
/// <summary>
/// Has the group changed due to an unlink operation? We record this in order to optimize deletion, since
/// an unlinked group currently has to be persisted to the database before we can perform an unlink operation.
/// Whether the group contains prims that came from a different group. This happens when
/// linking or delinking groups. The implication is that until the group is persisted,
/// the prims in the database still use the old SceneGroupID. That's a problem if the group
/// is deleted, because we delete groups by searching for prims by their SceneGroupID.
/// </summary>
public bool HasGroupChangedDueToDelink { get; private set; }
public bool GroupContainsForeignPrims
{
private set
{
m_groupContainsForeignPrims = value;
if (m_groupContainsForeignPrims)
HasGroupChanged = true;
}
get { return m_groupContainsForeignPrims; }
}
private bool isTimeToPersist()
{
@@ -1624,7 +1639,7 @@ namespace OpenSim.Region.Framework.Scenes
backup_group.RootPart.AngularVelocity = RootPart.AngularVelocity;
backup_group.RootPart.ParticleSystem = RootPart.ParticleSystem;
HasGroupChanged = false;
HasGroupChangedDueToDelink = false;
GroupContainsForeignPrims = false;
m_scene.EventManager.TriggerOnSceneObjectPreSave(backup_group, this);
datastore.StoreObject(backup_group, m_scene.RegionInfo.RegionID);
@@ -2388,6 +2403,8 @@ namespace OpenSim.Region.Framework.Scenes
// If linking prims with different permissions, fix them
AdjustChildPrimPermissions();
GroupContainsForeignPrims = true;
AttachToBackup();
// Here's the deal, this is ABSOLUTELY CRITICAL so the physics scene gets the update about the
@@ -2531,9 +2548,16 @@ namespace OpenSim.Region.Framework.Scenes
linkPart.Rezzed = RootPart.Rezzed;
// When we delete a group, we currently have to force persist to the database if the object id has changed
// (since delete works by deleting all rows which have a given object id)
objectGroup.HasGroupChangedDueToDelink = true;
// We must persist the delinked group to the database immediately, for safety. The problem
// is that although in memory the new group has a new SceneGroupID, in the database it
// still has the parent group's SceneGroupID (until the next backup). This means that if the
// parent group is deleted then the delinked group will also be deleted from the database.
// This problem will disappear if the region remains alive long enough for another backup,
// since at that time the delinked group's new SceneGroupID will be written to the database.
// But if the region crashes before that then the prims will be permanently gone, and this must
// not happen. (We can't use a just-in-time trick like GroupContainsForeignPrims in this case
// because the delinked group doesn't know when the source group is deleted.)
m_scene.ForceSceneObjectBackup(objectGroup);
return objectGroup;
}