Re: Computing d/control "Provides:" line

[Gergely Nagy <algernon@balabit.hu>]

Mathieu Malaterre <mathieu.malaterre@gmail.com> writes:

> On Wed, Nov 23, 2011 at 4:34 PM, Gergely Nagy <algernon@balabit.hu> wrote:
>> What exactly would you want to put in the Provides field in this case?
>
> Right now it would be something like:
>
> Package: libactiviz.net-cil
> Provides: libactiviz.net${`apt-cache policy libvtk5-dev | grep
> Installed | cut -d: -f2 | cut -d- -f1`}-cil
>
> Of course I am not looking for "Installed version" per say, but the
> idea is there: I need to compute the soversion of a package from
> another package version. This would allow me to request binNMU instead
> of doing source upload modifying one number in d/control.

The -V option of dpkg-gencontrol is what you seek, in this case. You can
do something like the following (assuming short-form dh7+):

override_dh_gencontrol:
	dh_gencontrol -- -VVTK_VERSION=$(shell ...)

Then in debian/control, you can use
Provides: libactiviz.net${VTK_VERSION}-cil

Just figure out a better way to get the version than the apt-cache
policy parsing.

If not using short-form dh7+, have a look at the dpkg-gencontrol manpage
(and dh_gencontrol, if using debhelper long form).

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