How to detect the version of a installed perl module during portbuild

[Chris Rees]

On 4 Jan 2012 08:59, "Matthew Seaman" <m.seaman at infracaninophile.co.uk>
wrote:
>
> On 03/01/2012 23:41, Paul Schmehl wrote:
> > This returns the installed package:
> >
> > pkg_info -qa | grep "p5-JSON-RPC" | sort | uniq
>
> Woah!  Try it like this:
>
> pkg_info -Ex p5-JSON-RPC
>
> > so maybe you could do something like?
> >
> > JSON_VER=`pkg_info -qa | grep "p5-JSON-RPC" | sort | uniq | cut -d'-'
-f4`
>
> JSON_VER=$( pkg_info -Ex p5-JSON-RPC | sed -e 's/^.*-//' )

$$(

It's a Makefile, don't forget ;)

>
> > .if ${JSON_VER} >= 1
> >  do this
> > .else
> >  do this
> > .endif
>
> case ${JSON_VER) in
>        1.*)
>            do_stuff
>            ;;
>        0.*)
>            do_something_else
>            ;;
> esac
>
> case does a string comparison using standard shell globbing rules --
> it's a lot more flexible than trying to do maths on version numbers.
>
> Using perl to generate the version number is also viable as suggested by
> Jason:
>
> perl -MJSON::RPC -le 'print $JSON::RPC::VERSION'
>
> but it strikes me as slightly wasteful to fire up an entire perl
> interpreter just to print out the value of one variable.
>
> However, if the object is to create a port that has a BUILD_DEPENDS on
> devel/p5-JSON-RPC then you only need to support what is already in the
> ports -- and that's version 1.01.  The BUILD_DEPENDS line can enforce
that:
>
> BUILD_DEPENDS = p5-JSON-RPC>=1.01:${PORTSDIR}/devel/p5-JSON-RPC
>
> Should you have some program that requires JSON::RPC <= 0.96, then
> create a p5-JSON-RPC-096 port to provide exactly that.
>
>        Cheers,
>
>        Matthew
>
> --
> Dr Matthew J Seaman MA, D.Phil.                   7 Priory Courtyard
>                                                  Flat 3
> PGP: http://www.infracaninophile.co.uk/pgpkey     Ramsgate
> JID: matthew at infracaninophile.co.uk               Kent, CT11 9PW
>