Re: Dependency generator hooks and extending default requires/provides

Sandro Mani <manisandro@xxxxxxxxx> · Sun, 5 Jul 2015 01:04:06 +0200

Title: Konsole output

    On 02.07.2015 09:00, Thierry Vignaud
      wrote:

      Just tell in mpo.attr what files are of interest for you and write a
script that compute the additional deps that are missing by rpmdeps
with default attr files
You've to write a script that will actually output the
"libfoo.so()(64bit)(mpich-x86_64)" requires/provides you want.
You must _NOT_ call rpmdeps.
Rpmdeps is just the high level program that collects the deps computed
by the various *.prov/*.req scripts according to *.attr rules.

So according to your links,
mpi.prov should do sg like

"if the path of the library starts with $MPI_LIB, append the
(openmpi) resp (mpich) to the provides string"

mpi.req should do sg like:
"if the path of the scanned object starts with $MPI_LIB and the
required library exists in $MPI_LIB, add (openmpi) resp (mpich) to the
requires string"

    Ok, by simply calling elfdeps (whose existence I hadn't noticed
    previously) I solved the endless loop issue and the scripts [1] now
    behave as desired.

You'll still got the generic "libfoo.so()(64bit)" provides but as
you'll provides & requires additional tags.

    This is the last hurdle I'm facing: an elf binary in an $MPI_HOME
    subfolder will now trigger both the elf as well as the mpi
    dependency generator, resulting in i.e. both

    libfoo.so()(64bit)
libfoo.so()(64bit)(openmpi-x86_64)

being generated for /usr/lib64/openmpi/lib/libfoo.so. For the problem I'm trying to solve [*], my goal is to only have libfoo.so()(64bit)(openmpi-x86_64). The only solution which comes to mind is adding

%__elf_exclude_path     ^%{_prefix}/lib(64)/(openmpi|mpich)/.*$

to elf.attr. This is somewhat hacky, but is there a cleaner approach?

Thanks,
Sandro  Konsole output

[1] https://smani.fedorapeople.org/rpm-mpi-hooks/
[*] Namely that if both libfoo and libfoo-openmpi provide libfoo.so, DNF can end up installing libfoo-openmpi for a non-mpi package bar which has a requires on libfoo (whereas YUM used to pick the providing package with the shorter name - the change in behavior in DNF is the reason this is suddenly a "problem").

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