Hi,

I maintain package opm-models [1] that got merged into opm-simulators [2] (by 
upstream)
for the new release 2024.10. The opm-models package has autopkgtests.

I have added transitional packages for opm-models in debian/control of 
opm-simulators version >=2024.10~,
e.g.:

Package: libopm-models-dev
Architecture: all
Section: oldlibs
Depends: libopm-simulators-dev (>= 2024.10~),
         ${misc:Depends}
Description: transitional package
 This is a transitional package. It can safely be removed.

Package: libopm-simulators-dev
Section: libdevel
Architecture: amd64 arm64 armel ia64 m68k mips64el mipsel ppc64el riscv64 
loong64
Multi-Arch: same
Depends: ${opm:shared-library}, ${misc:Depends}, libopm-grid-dev (>= 2024.10),
         libboost-date-time-dev
Replaces: libopm-simulators1-dev,
          libopm-models-dev (<< 2024.10~)
Suggests: libopm-simulators-doc
Breaks: libopm-models-dev (<< 2024.10~)
Description: Parallel porous media / reservoir simulators -- development files
 The Open Porous Media (OPM) software suite provides libraries and
 ...

This seems to work fine for the packages in local tests.

Unfortunately, britney still wants to execute the autopackgetest of source 
package
opm-models to find out whether migration to testing is safe. This fails in a 
strange
way. On the tracker [2] it reads:

autopkgtest for opm-models/n/a: amd64: Regression or new test

In the log [3] the test ends with

 28s Reading state information...
 29s Starting pkgProblemResolver with broken count: 0
 29s Starting 2 pkgProblemResolver with broken count: 0
 29s Done
 29s 0 upgraded, 0 newly installed, 0 to remove and 0 not upgraded.
 29s autopkgtest [12:05:44]: rebooting testbed after setup commands that 
affected boot
 45s autopkgtest [12:06:00]: testbed running kernel: Linux 6.1.0-27-amd64 #1 
SMP PREEMPT_DYNAMIC Debian 6.1.115-1 (2024-11-01)
 46s autopkgtest [12:06:01]: @@@@@@@@@@@@@@@@@@@@ apt-source opm-models
 48s blame: opm-models
 48s badpkg: rules extract failed with exit code 1
 48s autopkgtest [12:06:03]: ERROR: erroneous package: rules extract failed 
with exit code 1

I tried to replicate this in a chroot of unstable. I somehow fail to do this.
I get different problems: Getting the source and unpacking works, but 
compilation of the tests
fails as the version of opm-models merged into the new opm-simulators package 
(2024.10) is not
100% compatible with the sources in the old version (opm-models 2024.04) that 
are used for the autopkgtests

I wonder how I would be able to resolve this.

One idea would be posting a release critical bug to opm-models in testing and 
wait until the autoremoval takes place.

Is there another way?

How do other developers usually prevent this situation when merging packages 
with autopkgtests?
Would you first upload a version of the package to be merged without 
autopkgtests and once that
has migrated to testing start the merge?

Thanks a lot.

Best,

Markus

[1] https://tracker.debian.org/pkg/opm-models
[2] https://tracker.debian.org/pkg/opm-simulators
[3] 
https://ci.debian.net/data/autopkgtest/testing/amd64/o/opm-models/54496650/log.gz

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