On Thu, Nov 26, 2009 at 07:31:08PM +0100, Luk Claes wrote: > Stefano Zacchiroli wrote: > > On Thu, Nov 26, 2009 at 01:34:29PM +0100, Philipp Kern wrote: > >> IIRC if you say, for instance, "apt-get install foo", then apt only > >> considers > >> the newest version (well, subjected to pinning, but let's consider that > >> pinning is not present) and then tries to satisfy its dependencies. It > >> does > >> not notice that it's not installable *and then* retry with older versions. > > > > You're absolutely right: having played with more powerful dependency > > solvers in the last months made me forget for a minute one of the most > > annoying limitations of apt :-) > > > > So yes, given the specificities of the issue here, I thing we should add > > a flag to edos-builddebcheck that made it ignore, directly during > > parsing, the non-most-recent version of any package. I believe it should > > not be the default, since edos-builddebcheck really answers the question > > "are build-dep satisfiable?" and not "are build-dep satisfiable by > > apt?". Of course wanna-build will pass that flag to edos-builddebcheck. > > Ignoring older packages is also not correct. If an Arch: any package > with an older version has a strict dependency on an Arch: all package > which is still available, apt will happily install them if you try to > install the Arch:any package and will refuse to install the newer > Arch:all package if you would try that AFAIK.
Indeed, edos-(build)debcheck would happily propose to install an older version of a package to make an installation succeed. Anyway, we will have to live with the fact that an analysis using edos-builddebcheck will be an approximation of apt's behaviour since apt has a build-in strategy that is, from a logical point of view, incomplete. We can accept false positives (indicating buildability), but must attempt to avoid false negatives. After Luk's argument that means that edos-builddebbcheck should see the full list of packages. -Ralf. -- To UNSUBSCRIBE, email to debian-bugs-dist-requ...@lists.debian.org with a subject of "unsubscribe". Trouble? Contact listmas...@lists.debian.org
