Method resolveDependencies

launcher/minecraft/ComponentUpdateTask.cpp:501–635

FIXME, TODO: decouple dependency resolution from loading FIXME: This works directly with the PackProfile internals. It shouldn't! It needs richer data types than PackProfile uses. FIXME: throw all this away and use a graph

// FIXME: This works directly with the PackProfile internals. It shouldn't! It needs richer data types than PackProfile uses.
// FIXME: throw all this away and use a graph
void ComponentUpdateTask::resolveDependencies(bool checkOnly)
{
    qDebug() << "Resolving dependencies";
    /*
     * this is a naive dependency resolving algorithm. all it does is check for following conditions and react in simple ways:
     * 1. There are conflicting dependencies on the same uid with different exact version numbers
     *    -> hard error
     * 2. A dependency has non-matching exact version number
     *    -> hard error
     * 3. A dependency is entirely missing and needs to be injected before the dependee(s)
     *    -> requirements are injected
     *
     * NOTE: this is a placeholder and should eventually be replaced with something 'serious'
     */
    auto & components = d->m_list->d->components;
    auto & componentIndex = d->m_list->d->componentIndex;

    RequireExSet allRequires;
    QStringList toRemove;
    do
    {
        allRequires.clear();
        toRemove.clear();
        if(!gatherRequirementsFromComponents(components, allRequires))
        {
            emitFailed(tr("Conflicting requirements detected during dependency checking!"));
            return;
        }
        getTrivialRemovals(components, allRequires, toRemove);
        if(!toRemove.isEmpty())
        {
            qDebug() << "Removing obsolete components...";
            for(auto & remove : toRemove)
            {
                qDebug() << "Removing" << remove;
                d->m_list->remove(remove);
            }
        }
    } while (!toRemove.isEmpty());
    RequireExSet toAdd;
    RequireExSet toChange;
    bool succeeded = getTrivialComponentChanges(componentIndex, allRequires, toAdd, toChange);
    if(!succeeded)
    {
        emitFailed(tr("Instance has conflicting dependencies."));
        return;
    }
    if(checkOnly)
    {
        if(toAdd.size() || toChange.size())
        {
            emitFailed(tr("Instance has unresolved dependencies while loading/checking for launch."));
        }
        else
        {
            emitSucceeded();
        }
        return;