Re: [zypp-devel] How to get a packages' depends and requires from libzypp

7 Dec 2007


      On Dec 7, 2007 8:48 AM, Boyd Timothy  wrote:
...
On Dec 7, 2007 1:30 AM, Stefan Schubert  wrote:
...
Boyd Timothy schrieb:
...
On Dec 6, 2007 3:54 AM, Stefan Schubert  wrote:
...
Duncan Mac-Vicar Prett schrieb:
    const solver::detail::ItemCapKindList isInstalledBy (const
PoolItem_Ref item);
const solver::detail::ItemCapKindList installs (const PoolItem_Ref
item);
Been trying to figure out how to call this.  Right now in my code, I
iterate through the pool looking for the main package, mark it to be
installed, run the solver, and now I'm to the point where I'd call
installs().  Where do I get a PoolItem_Ref?
Sample code here: http://pastebin.com/f78dc52da
Line 98 is where I'm stumped.  installs() takes a PoolItem_Ref, but
where do I get one of those?  Line #65 doesn't compile either, for
what it's worth.
-Boyd
It is defined in the return value:
/**
     * Gives information about WHICH additional items will be installed
due the installation of an item.
     *
     * \param item     Evaluate additional information for this resolvable.
     * \return A list of structures which contains:
     *        item     Item which will be installed due to the
installation of the given param item too.
     *        cap      Capability which causes the installation
     *        capKind  Kind of that capability (e.g.
Dep::REQUIRES,Dep::RECOMMENDS,... )
     *
     * Note: In order to have a result start a solver run before. Not
matter if it is valid or invalid.
     *
     */
    const solver::detail::ItemCapKindList installs (const PoolItem_Ref
item);
The class ItemCapKindList is defined solver/details/Resolver.h:
///////////////////////////////////////////////////////////////////
    //
    //    CLASS NAME : ItemCapKind
    //
    /** */
    struct ItemCapKind
    {
    public:
    Capability cap; //Capability which has triggerd this selection
    Dep capKind; //Kind of that capability
    PoolItem_Ref item; //Item which has triggered this selection
    bool initialInstallation; //This item has triggered the installation
                              //Not already fullfilled requierement only.
ItemCapKind() : capKind("FRESHENS") {}
        ItemCapKind( PoolItem i, Capability c, Dep k, bool initial)
        : cap( c )
        , capKind( k )
        , item( i )
        , initialInstallation( initial )
        { }
    };
    typedef std::multimap ItemCapKindMap;
    typedef std::list<ItemCapKind> ItemCapKindList;
Here is a little example:
zypp::solver::detail::ItemCapKindList installList =
resolver->installs (item);
    zypp::solver::detail::ItemCapKindList installedList =
resolver->isInstalledBy (item);
    installListView->clear();
    installedListView->clear();
for (zypp::solver::detail::ItemCapKindList::const_iterator iter =
installedList.begin();
         iter != installedList.end(); ++iter) {
        QListViewItem *element = new QListViewItem( installedListView,
                            iter->item->name(),
iter->item->edition().asString()+"."+iter->item->arch().asString(),
                            iter->cap.asString(),
                            iter->capKind.asString());
    }
    for (zypp::solver::detail::ItemCapKindList::const_iterator iter =
installList.begin();
         iter != installList.end(); ++iter) {
        QListViewItem *element = new QListViewItem( installListView,
                            iter->item->name(),
iter->item->edition().asString()+"."+iter->item->arch().asString(),
                            iter->cap.asString(),
                            iter->capKind.asString());
}
Okay, well, once you have the PoolItem_Ref, the code makes sense, but
I'm still unsure where I get the PoolItem_Ref originally.  What call
can I make to get that?
Ah, thanks to mvidner in #zypp, we learned that you can get it from
Selectable::candidatePoolItem ().

Cheers,

Boyd
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