Re: DNF vs YUM, $pkg, $pkg-mpi, $pkg-openmpi having same provides

[Sandro Mani]

On 12.06.2015 10:28, Radek Holy wrote:


------------------------------------------------------------------------

    *From: *"Sandro Mani" <manisan...@gmail.com>
    *To: *"Development discussions related to Fedora"
    <devel@lists.fedoraproject.org>
    *Sent: *Thursday, June 11, 2015 6:01:12 PM
    *Subject: *DNF vs YUM, $pkg, $pkg-mpi, $pkg-openmpi having same
    provides

    Hello,

    Investigating bug #1230838, I noticed that when installing
    mmg3d-libs, dnf installs Konsole output ptscotch-mpich, whereas
    yum-deprecated installs scotch. Both scotch and  ptscotch-mpich
    provide the required libscotch.so.0()(64bit), albeit one in
    /usr/lib64/ and the other one in /usr/lib64/mpich/lib/:

    $ dnf repoquery --requires mmg3d-libs
    [...]
    libscotch.so.0()(64bit)
    libscotcherr.so.0()(64bit)
    [...]


    $ dnf provides 'libscotch.so.0()(64bit)'
    ptscotch-mpich-6.0.4-2.fc23.x86_64 : PT-Scotch libraries compiled
    against mpich
    Repo        : rawhide

    ptscotch-openmpi-6.0.4-2.fc23.x86_64 : PT-Scotch libraries
    compiled against openmpi
    Repo        : rawhide

    scotch-6.0.4-2.fc23.x86_64 : Graph, mesh and hypergraph
    partitioning library
    Repo        : rawhide


    Konsole output $ dnf repoquery -l scotch.x86_64 | grep libscotch.so.0
    /usr/lib64/libscotch.so.0
    /usr/lib64/libscotch.so.0.2


    Konsole output $ dnf repoquery -l ptscotch-mpich.x86_64 | grep
    libscotch.so.0
    /usr/lib64/mpich/lib/libscotch.so.0
    /usr/lib64/mpich/lib/libscotch.so.0.2


    $ dnf install mmg3d-libs
    [...]
    Installing:
     environment-modules x86_64                   3.2.10-14.fc23
    rawhide                   117 k
     hwloc-libs x86_64                   1.10.1-2.fc23
    rawhide                   1.3 M
     lzma-libs x86_64                   4.32.7-13.fc22
    rawhide                    38 k
     mmg3d-libs x86_64                   4.0.2-1.fc23
    rawhide                   211 k
     mpich x86_64                   3.1.4-3.fc23
    rawhide                   1.1 M
     ptscotch-mpich

    $ yum-deprecated install mmg3d-libs
    [...]
    Installing:
     mmg3d-libs                     x86_64 4.0.2-1.fc23
    rawhide                     211 k
    Installing for dependencies:
     lzma-libs                      x86_64 4.32.7-13.fc22
    rawhide                      38 k
     scotch


    So, whose fault is this? Packaging of dnf? Nothing relevant for
    this caught my eye skimming through the packaging guidelines.

    And related: trying to install some $pkg-openmpi package, I don't
    generally see packages enforcing that the -openmpi version of some
    dependency library is installed as opposed to just the regular
    libs package. Should such requires need to be stated explicitly?

    Thanks,
    Sandro

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If a package "Requires: foo" and both "bar" and "barbaz" "Provides: 
foo", they are handled as being equally suitable. DNF/libsolv is not 
going to prefer packages with shorter names.
So what is the solution in this situation? This seems to be a change in 
behaviour compared to yum, and it potentially affects a number of 
packages (in particular $pkg vs $pkg-openmpi, $pkg-mpich). I suppose (as 
an immediate solution at least), all such Requires need to be stated 
explicitly in the package?

Thanks,
Sandro

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