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

[Radek Holy <rholy@xxxxxxxxxx>]

Title: Konsole output

---

From: "Sandro Mani" <manisandro@xxxxxxxxx>
To: "Development discussions related to Fedora" <devel@xxxxxxxxxxxxxxxxxxxxxxx>
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 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


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


$ 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.

--

Radek Holý
Associate Software Engineer
Software Management Team
Red Hat Czech

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