Bug#915573: libhdf5-mpich-103:amd64 should conflict with libhdf5-mpich-101:amd64

[Gilles Filippini]

On 2018-12-05 10:53, Adrian Bunk wrote:
> On Wed, Dec 05, 2018 at 10:35:17AM +0100, Gilles Filippini wrote:
>> Control: severity -1 wishlist
>> Control: tags -1 + wontfix
>> 
>> Hi,
>> 
>> On 2018-12-05 00:34, Witold Baryluk wrote:
>> > Package: libhdf5-mpich-103
>> > Severity: important
>> >
>> >
>> > The following additional packages will be installed:
>> >   libhdf5-mpich-103
>> > The following NEW packages will be installed:
>> >   libhdf5-mpich-103
>> > 0 upgraded, 1 newly installed, 0 to remove and 141 not upgraded.
>> > 2 not fully installed or removed.
>> > Need to get 0 B/1365 kB of archives.
>> > After this operation, 4688 kB of additional disk space will be used.
>> > Do you want to continue? [Y/n]
>> > (Reading database ... 551515 files and directories currently installed.)
>> > Preparing to unpack .../libhdf5-mpich-103_1.10.4+repack-1_amd64.deb ...
>> > Unpacking libhdf5-mpich-103:amd64 (1.10.4+repack-1) ...
>> > dpkg: error processing archive
>> > /var/cache/apt/archives/libhdf5-mpich-103_1.10.4+repack-1_amd64.deb
>> > (--unpack):
>> >  trying to overwrite
>> > '/usr/lib/x86_64-linux-gnu/libhdf5_mpich_fortran.so.100', which is
>> > also in package libhdf5-mpich-101:amd64 1.10.2+repack-1~exp1
>> > Errors were encountered while processing:
>> >  /var/cache/apt/archives/libhdf5-mpich-103_1.10.4+repack-1_amd64.deb
>> > E: Sub-process /usr/bin/dpkg returned an error code (1)
>> 
>> I do not agree: HDF5 1.10.2 was uploaded to experimental only. While 
>> this
>> conflict do exist, there is no unhandled conflict with previous 
>> releases
>> from testing or unstable.
> 
> What is the problem with adding Replaces+Conflicts
> also for libhdf5-mpich-101?
> 
> I agree that the severity looks less clear if this was 
> experimental-only,
> but it is also pretty easy to do.

Sure, this is an unfortunate oversight from me. But (1) hdf5 1.10.4 is 
currently
transitioning and I don't want to delay that anymore, and (2) I expect 
that
anybody installing packages from experimental is able to deal with this 
kind
of conflict.

> In theory (likely not applicable here) it is even possible that some
> downstream distribution like Ubuntu shipped the experimental version
> in a stable release.

No, ubuntu didn't ship any HDF5 release from experimental. And packages 
from
experimental must not be used in any stable release. Quoting the FAQ:
> Experimental is used for packages which are still being developed, and 
> with
> a high risk of breaking your system. It's used by developers who'd like 
> to
> study and test bleeding edge software. Users shouldn't be using 
> packages
> from there, because they can be dangerous and harmful even for the most
> experienced people.

Thanks,

_g.