On 25.02.2012 21:22, Cyril Brulebois wrote:
> Adam D. Barratt <a...@adam-barratt.org.uk> (05/12/2011):
>> On Mon, 2011-12-05 at 16:34 +0900, Nobuhiro Iwamatsu wrote:
>>> First, we had better upload libpng15, after changing libpng12-dev
>>> into libpng-dev.  Surely, I think that this method is easy for
>>> shift.
>>
>> We appear to have different definitions of "easy".  Anything that
>> involves changes to and uploads of over 300 packages is not what the
>> release team classifies as easy.
> 
> I set up a tracker in the meanwhile:
>   http://release.debian.org/transitions/html/libpng1.5.html
> 
> and it doesn't qualify as “easy” by my standards either.


Seems there has been a MBF regarding changing the build-depedency from
libpng12-dev to libpng-dev.
Reading through #650601 and seeing the amount of packages affected, I
think the proposed plan is not good for several reasons.
a/ virtual provides can't safisfy versioned dependencies
b/ switching blindly from libpng12-dev to libpng-dev doesn't mean the
package will actually build against libpng15
c/ testing migration will be a night mare.

What about the following:
- Make libpng12 and libpng15 co-installable, by using different source
package names, e.g. src:libpng and src:libpng15
- src:libpng12 builds libpng12-dev, src:libpng15 builds libpng15-dev
- upload *both* packages to unstable
- src:libpng12 builds a real package libpng-dev, which depends on
libpng12-dev (with a strict dep), this way versioned build-depends can
be satisfied.
- let both packages migrate to testing
- tell maintainers to test their packages against libpng15, and do the
following:
   1/ if it builds against both libpng12 and libpng15, change the b-dep
to libpng-dev
   2/ if it needs updates for libpng15 and the change is not backwards
compatible, b-depend on libpng15-dev
- when all packages have been updated to depend on either libpng-dev or
libpng15-dev, make src:libpng15 build libpng-dev and make it depend on
libpng15-dev and binNMU the remaining lot.

This way, we don't need to start a huge transition, which has the
potential to block other transitions due to testing migration.


How does that sound?

Michael
-- 
Why is it that all of the instruments seeking intelligent life in the
universe are pointed away from Earth?

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