rpm-list-bounces@xxxxxxxxxxxxx wrote on 05/13/2011 03:12:46 PM:
> On Fri, May 13, 2011 at 2:40 PM, Tim Mooney <Tim.Mooney@xxxxxxxx> wrote:
> In regard to: how to prevent rpmbuild from incorrectly discovering a
Perl...:
>
> What I have in one of my Perl programs something like:
>
> print <<EOF;
> use Net::SNMP::AgentX qw(:types :pdus :errors :options);
> EOF
>
> So my code 'emits' a line of text that contains a 'use' statement,
> but it does not actually ever execute that 'use' statement,
> therefore _my_ package is NOT dependent on that module.
>
> Perl is incredibly challenging to parse correctly, which is why the
> dependency generator sometimes gets it wrong.
>
> The easiest thing to try would be to break your very small here-doc into
> pieces that the dependency detector won't notice. Something like
>
> print 'use ';
> print 'Net::SNMP::AgentX ';
> print 'qw(:types :pdus :errors :options);';
> print "\n";
>
> or
>
> print join(' ', 'use', 'Net::SNMP::AgentX',
> 'qw(:types :pdus :errors :options);'), "\n";
>
> Thanks, I didn't think of that... I'll try it.
>
> In the mean time, I added the following statement to my spec file:
>
> Provides: perl(Net::SNMP::AgentX)
>
> I know I'm lying, but it got around my issue.
>
> As long as we're talking about the 'challenging to parse correctly issue:
>
> I also have a case like:
>
> return "" unless (eval "use GraphViz; 1");
>
> And it _doesn't_ detect the 'use' inside of 'evals' so I have manually
> added Requires: directives for those cases.
So... instead of making your RPM lie, or editing you code, you could do
this:
%define __find_requires %{_tmppath}/%{name}-requires.sh
%install
# Run the requirement generator, but strip out the requirements we are
ignoring.
# This is the script referenced in the __find_requires macro above.
echo "#!/bin/sh" > %{_tmppath}/%{name}-requires.sh
echo '/usr/lib/rpm/rpmdeps --requires | egrep -v "^(perl\(Net::SNMP::AgentX
\))$"' >> %{_tmppath}/%{name}-requires.sh
chmod 0700 %{_tmppath}/%{name}-requires.sh
%clean
rm -fr %{_tmppath}/%{name}-requires.sh
The egrep is there because what we used this got was actually a long list
separated by pipe characters. Since ours was checking for libraries not
perl modules, you might have to play with the actual expression.
-greg
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