Provided by: apt-cudf_5.0.1-14build2_amd64 bug


       apt-cudf - CUDF solver integration for APT




       apt-cudf translates back and forth among a CUDF-based dependency solver and the protocol
       used by APT to talk with external dependency solvers. apt-cudf therefore allows one to use
       any CUDF solver as an external solver for APT.

       apt-cudf relies on its "argv[0]" name to find the CUDF solver to invoke.  In common
       setups, you should have a CUDF solver specification file under /usr/share/cudf/solvers/
       for each installed CUDF solver. To use one such solver with APT, you should create a
       symbolic link pointing to /usr/bin/apt-cudf under /usr/lib/apt/solvers/ and call it with
       the name of the CUDF solver you want to use.


           Print debugging information during operation. Can be repeated.

           Show usage information and exit.

           Show program's version and exit.

           Dump the cudf universe and solution

           Dump the cudf universe and solution and exit. This is useful to generate a cudf
           universe from a edsp file

           Use a configuration file. Default in /etc/apt-cudf.conf

       -s <solver>
       --solver <solver>
           Specify the external solver to use.

       -c <criteria>
       --criteria <criteria>
           Specify the optimization criteria in extended MISC 2012 syntax. This value will be
           converted into the optimization criteria language understood by the respective solver.

           As an extension to the MISC 2012 syntax, a variation of the count() measurement is
           supported by apt-cudf. The extension allows to minimize or maximize the number of
           packages in a set that have an EDSP field matching a regular expression. Two formats
           exist. The first searches for a plain string within the EDSP field value:


           While the second one understands the regular expression syntax of the OCaml Re.Pcre


           The regex or plain string are delimitered by any character (the slash was chosen in
           both above examples) but that character must not be part of the regex or plain string
           itself (there is no escaping mechanism).

           This option cannot be used together with the --criteria-plain option.

       --criteria-plain <criteria>
           This optimization criteria is passed directly to the solver without any prior parsing.

           This option cannot be used together with the --criteria option.

           Print a human-readable summary of the solution.

           Speficy the native architecture to be used in the edsp -> cudf translation. By default
           apt-cudf uses apt-config to deduce the native architecture. This option is useful if
           the edsp was generated on a machine with a different architecture.

           A comma-separated list of foreign architectures to be used in the edsp -> cudf


       Find a solution for installing the package ghc which minimizes the packages from

               apt-get --simulate install --solver dump -o APT::Solver::Strict-Pinning=false ghc
               apt-cudf -v --solver=aspcud -c "-count(solution,APT-Release:=/a=experimental/),-removed,-changed,-new" /tmp/dump.edsp

       Usually apt-cudf is not called directly by the user but indirectly by apt-get.  So the
       above would become:

               apt-get --simulate install --solver aspcud -o APT::Solver::Strict-Pinning=false -o APT::Solver::aspcud::Preferences="-count(solution,APT-Release:=/a=experimental/),-removed,-changed,-new" ghc/experimental


       apt-get(8), update-cudf-solvers(8), README.cudf-solvers <file:///usr/share/doc/apt-
       cudf/README.cudf-solvers>, README.Debian <file:///usr/share/doc/apt-cudf/README.Debian>


       Copyright: (C) 2011 Pietro Abate <> Copyright: (C) 2011 Stefano
       Zacchiroli <>

       License: GNU Lesser General Public License (GPL), version 3 or above

                                            2020-02-21                                APT-CUDF(1)