[Fedora-packaging] The role of %{_libexecdir} for using environment-modules

[Jussi Lehtola]

On Fri, 2008-10-10 at 12:48 +0200, Ralf Corsepius wrote:
> Internal applications => libexec
> > > 
> > > User-callable applications => bindir
> > > 
> > > User-callable add-on applications => /usr/lib/<somewhere> (!) or %
> > > libdir/<somewhere>
> > > 
> > > Multi-arched applications => %libdir/<somewhere>
> > 
> > So... for a program (gromacs) using environment-modules
> No idea what you mean by "environment-modules".

See http://modules.sourceforge.net/ . As a reminder, here's Ed's mail
from a couple of days ago.

On Tue, 2008-10-07 at 21:15 -0400, Ed Hill wrote:

Hi folks,
> 
> *Please* stop suggesting alternatives.
> 
> Alternatives is a total failure for user-space applications that are
> not *completely* generic and 100% interchangeable.  Lets illustrate
> this point with three use cases:
> 
>   Use case 1 : Two users (Alice and Bob) are using the same system
>     (machine) at the same time.  Alice must use MPI implementation
>     "A" since it is the only one that works properly with her 
>     application.  And Bob wants to use the "B" implementation since 
>     it is the one that works best for his application.  Since
>     alternatives is a *system-wide* setting, it can only satisfy one
>     user a time -- never both.  Thus, it is a total failure for this
>     use case.
> 
>   Use case 2 : A single user (Carl), wants to run two programs 
>     (Foo and Bar) simultaneously.  The Foo program feeds its results
>     to the Bar program.  And the Foo program requires the "A" MPI 
>     implementation while Bar requires the "B" implementation.  Since 
>     alternatives is a system-wide configuration setting, Carl cannot
>     run the two programs at the same time.  Again, alternatives is
>     not up to the task.
> 
>   Use case 3 : Dan and Evan both want to use the Baz program but Dan
>     requires certain features only available with Baz v1.0 while 
>     Evan must have features only present in Baz v2.0.  As in use case
>     #1, both Dan abd Evan are trying to use the same machine.
> 
> 
> Please notice that modules (aka "environment modules") is a perfectly
> workable solution for all the above scenarios and it does not require
> any help from an admin (or root/sudo perms).
> 
> Ed
-- 
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Jussi Lehtola, FM, Tohtorikoulutettava
Fysiikan laitos, Helsingin Yliopisto
jussi.lehtola at helsinki.fi, p. 191 50632
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Mr. Jussi Lehtola, M. Sc., Doctoral Student
Department of Physics, University of Helsinki, Finland
jussi.lehtola at helsinki.fi
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