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7051d5b0e9
The new Installability Tester (IT) module replaces the remaining C-parts. Unlike C-implementation, it does not give up and emit an "AIEEE" half-way through. In order to determine installability, it uses two sets "musts" and "never". As the names suggest, the sets represents the packages that must be (co-)installable with the package being tested and those that can never be co-installable. For a package to be installable, "musts" and "never" have remain disjoint. These sets are also used to reduce the number of alternatives that are available to satisfy a given dependency. When these sets are unable to remove the choice completely, the new IT defers the choice to later. This occasionally reduces backtracking as a later package may conflict or unconditionally depend on one of the remaining alternatives. Signed-off-by: Niels Thykier <niels@thykier.net>
README for britney v2.0 ======================= Please write here some useful stuff.