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Re: Do we want to Require or Recommend DH

On Tue, May 14, 2019 at 10:27:45AM +0200, Johannes Schauer wrote:
> Quoting Adrian Bunk (2019-05-14 10:11:46)
> > 
> > How well are you testing such conversions?
> > Based on work I've seen from you I'd guess your NMU would be better than 
> > average. Unfortunately this is not generally true.
> > 
> > Based on what enters the archive, "debdiff between old and new package" 
> > already seems to be something that many people are not doing - then
> > cleaning up after mass-NMUs would be much work.
> > 
> > I have even seen maintainers blindly replacing a complex old
> > debian/rules with the dh 3-liner, and all the bugfixes and
> > workarounds in the old one were bugs again.
> > 
> > To show the quantitative side of my argument:
> > 
> > The default change to parallel building in dh compat 10 alone has caused 
> > a three digit number of RC bugs, popping up at a pace of 1-2 RC bugs
> > per week for several years.
> > 
> > The problem is that anything that works for only 99% of all packages
> > results in such a high number of new bugs.
> > 
> > Parallel build bugs slipping through an upload can happen,
> > but maintainers not going through the upgrading checklist
> > and running debdiff between old and new packages as well
> > as testing them when doing dh compat bumps is harder to
> > excuse - and in practice this does happen.
> > 
> > There is no perfect solution here
> What makes reproducible-builds not the perfect fit for this?
> Whenever I converted a package to dh or bumped debhelper compat level, I always
> checked whether the produced binaries were bit-by-bit identical to the ones
> before.

Don't assume everyone follows the same high standards as you do.

> Are there many errors that I would be missing by relying on reproducibility
> results?

The parallel build issues I mentioned might be missed,
but this is more exceptional.

dh compat 12 defaulting to dh_dwz might make the -dbgsym packages 
different, and other intentional differences might exist.

> Thanks!
> cheers, josch



       "Is there not promise of rain?" Ling Tan asked suddenly out
        of the darkness. There had been need of rain for many days.
       "Only a promise," Lao Er said.
                                       Pearl S. Buck - Dragon Seed