Bug#717923: transition: tiff 4.x (libtiff5)

[Jay Berkenbilt <qjb@debian.org>]

Julien Cristau <jcristau@debian.org> wrote:

> On Tue, Dec  3, 2013 at 16:02:17 -0500, Jay Berkenbilt wrote:
>
>> If you're good with this plan, give me the word, and I will do the
>> upload.  I can probably take care of the mass bug filing...I can script
>> it locally unless you have a quick way to do it.
>> 
> Sounds good to me, I think we can go ahead with this.

I've got it ready to go but with two changes, so I wanted to get
confirmation.

1. Why is it necessary for the transition packages to depend on the
binary libraries and not just the dev package?  If libtiff4-dev and
libtiff5-alt-dev depend on libtiff5-dev (>> 4.0.3-6~), isn't this
sufficient?  Is there some special reason that the dependency on
libtiff5 (and presumably also libtiffxx5) has to be explicit?

2. I think I'm going punt on libtiff4-alt-dev.  Fedora switched over
to tiff 4.x a while ago and never provided any way for people to build
against 3.x libraries.  There were only something like 3 packages that
had any issues, and by now, fixes are available in all cases.  Also,
unlike libtiff5-alt-dev, which was totally transparent because of
pkg-config, tiff 3.x doesn't use pkg-config, so having people use it
would require changes to their builds anyway.

The new package will 4.0.3-6.  For libtiff4-dev and libtiff5-alt-dev,
both provided by the "tiff" source package, I have

Depends: ${misc:Depends}, libtiff5-dev (>> 4.0.3-6~)

and for libtiff5-dev, I have

Replaces: libtiff5-alt-dev (<< 4.0.3-6~), libtiff4-dev (<< 4.0.3-6~)
Conflicts: libtiff5-alt-dev (<< 4.0.3-6~), libtiff4-dev (<< 4.0.3-6~)
Provides: libtiff-dev

For the tiff3 package, I just dropped the libtiff4-dev package and the
provides of libtiff-dev along with it.  There will be no -dev package
for tiff 3.x.

I won't upload today because I want to compose a message to debian-devel
first, but if this sounds okay, I will do the upload tomorrow.  I did
various tests including installing libtiff4-dev and libtiff5-alt-dev and
upgrading.  The upgrade pulled in libtiff5-dev and libtiff5xx (libtiff5
was already on my system) and autoremoved libtiffxx0c2, and then it was
safe for me to remove the two transitional packages as expected.  I also
tested building vips in a chroot with the updated packages.  vips has
tons of dependencies including both tiff4 and tiff5 indirectly.
Everything looks good there as well.

-- 
Jay Berkenbilt <qjb@debian.org>