On 25.02.2012 21:22, Cyril Brulebois wrote: > Adam D. Barratt <adam@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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