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authorChantry Xavier <shiningxc@gmail.com>2008-02-16 10:47:22 -0600
committerDan McGee <dan@archlinux.org>2008-04-26 11:36:01 -0500
commit701a03dcdb113e92b4f8de52a7a427dfdfc3dd27 (patch)
tree670bae62f1dce6ea8c22a7afa9f5ba79aa4f1573 /submitting-patches
parent30bdf94c2b444ff475a32e7b0c569e8c3cf05797 (diff)
Completely rework delta algorithm
Using the graph structures that Nagy set up for dependency sorting, we now do a similar process for deltas. Load up all of the deltas into a graph object on which we can then apply Dijkstra's algorithm, using the new weight field of graph struct. We initialize the nodes weight using the base files that we can use in our filecache (both filename and md5sum must match). The algorithm then picks the best path among those that can be resolved. Note that this algorithm has a few advantages over the old one: 1. It is completely file agnostic. These delta chains do not have to consist of package files- this could be adopted to do delta-fied DBs. 2. It does not use the local_db anymore, or even care if a package or file is currently installed. Instead, it only looks in the filecache for files and packages that match delta chain entries. Original-work-by: Dan McGee <dan@archlinux.org> Signed-off-by: Chantry Xavier <shiningxc@gmail.com>
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