softwarecollections January 2013

softwarecollections@lists.fedorahosted.org

5 participants
2 discussions

The scl command is confusing
by Andrew Ford 21 Jan '13

21 Jan '13

I am giving a talk about Software Collections to my colleagues at work on Monday and I remembered the confusion I first had with the scl command. I was expecting the "scl enable" command to set up symbolic links or something - i.e. make some long-lasting change to the envionment in the way that perlbrew does, i.e. set up or enable a particular version of software. The word "enable" here is actually a misnomer, and scl is more akin to the coreutils "modified command invocation" commands (chroot, env, nice, nohup, etc.) - or even ssh. The other thing I trip over is that all arguments up to the last are collection names. I know that the scl command is pretty much established now, but a nicer syntax would be: scl-env --with perl-5.18 perl script argument ... i.e. provide the collection name as an option and let the rest of the command line be passed to the command to be invoked with the modified environment. If you want to run a command with multiple collections enabled then give the --with option multiple times, or provide the names in a single argument separated with spaces or commas, e.g. scl-env --with perl-5.18 --with mysql-5.1 perl script argument ... or scl-env --with perl-5.18,mysql-5.1 perl script argument ... Just my two cents' worth. Andrew -- Andrew Ford South Wing Compton House, Compton Green, Redmarley, Gloucestershire, GL19 3JB, UK Tel: +44 1531 829900 Mobile: +44 7785 258278 Email: A.Ford(a)ford-mason.co.uk

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spec2scl issues
by Andrew Ford 16 Jan '13

16 Jan '13

I am trying to SCL-ize a set of spec files generated by cpanspec and spec2scl consistently modifies the line Requires: perl(:MODULE_COMPAT_%(eval "`%{__perl} -V:version`"; echo $version)) to be %{?scl:scl enable %{scl} '} Requires: %{?scl_prefix}perl(:MODULE_COMPAT_%(eval "`%{__perl} -V:version`"; echo $version)) %{?scl:'} But the preamble isn't a script so this should probably be changed to: Requires: %{?scl_prefix}perl(:MODULE_COMPAT_%(eval "`%{?scl:scl enable %{scl} '}%{__perl} -V:version%{?scl:'}`"; echo $version)) but actually in a Perl SCL environment %{__perl} is defined as "%_scl_root/usr/bin/perl" so the wrapping in "scl enable %{scl}" is not necessary, so the wrapper lines could just be dropped in the preamble. Andrew

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softwarecollections January 2013