pmacct package proposal

[Paul Howarth]

On 08/03/2011 11:42 AM, Chris Wilson wrote:
>>>>>> %if 0%{?fedora} || 0%{?rhel_version} || 0%{?centos_version}
>>>>>> Requires: mysql postgresql-libs
>>>>>> %else
>>>>>> Requires: mysql-shared postgresql-libs
>>>>>> %endif
>>
>> did you define and pass to rpmbuild one of the variables which triggers
>> the first branch of the test ? By default these variables are not
>> defined and therefore the whole branch is skipped. in koji the needed
>> variables are defined by the build environment but for local builds you
>> must define them yourself, as appropriate for your use case.
>
> Ah, I didn't know that. Is there a sensible way to detect the distro
> automatically so that users can run rpmbuild without worrying about
> unusual/non-standard command-line options and it will just work?

For the example above you could probably use something like:

%if %([ -e /etc/redhat-release ] && echo 1 || echo 0)
Requires: mysql postgresql-libs
%else
Requires: mysql-shared postgresql-libs
%endif

since /etc/redhat-release exists on Fedora/RHEL/CentOS but not on SuSE.

Normally though you would use conditionals like this for BuildRequires 
and let rpm work out the library dependencies (runtime Requires) for itself.

Paul.