[Bug 1762445] package perl-HTTP-Tiny-0.076-1.module_2073+eebc5b71.noarch requires perl(:MODULE_COMPAT_5.26.2), but none of the providers can be installed

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https://bugzilla.redhat.com/show_bug.cgi?id=1762445



--- Comment #5 from Petr Pisar <ppisar@xxxxxxxxxx> ---
(In reply to John Florian from comment #4)
> I'm not sure I follow the whole [d] or [e] thing.  Yours has a mix of [d]
> and no [d].  Mine looks the same from what I can tell:
> 
> $ dnf module list | grep '^perl\s'
> perl                5.24           minimal, default                         
> Practical Extraction and Report Language         
> perl                5.26           minimal, default [d]                     
> Practical Extraction and Report Language         
> perl                5.26           minimal, default [d]                     
> Practical Extraction and Report Language         
> perl                5.28           minimal, default [d]                     
> Practical Extraction and Report Language         
> perl                5.30           common, minimal, default [d]             
> Practical Extraction and Report Language 
> 
That's fine. The [d] you can see is for a profile. E.g. perl:5.24 has two
profiles "minimal" and "default". And none of the profiles is default.
perl:5.26 has the same profiles, but "default" profile is default.

What I was interested was [d] or [e] at a stream, compare with a "skim" module:

# dnf --quiet module list skim
Fedora Modular 29 - x86_64 - Updates
Name            Stream                Profiles              Summary             
skim            rolling [d]           default [d]           Fuzzy Finder in
Rust          

Fedora Modular 29 - x86_64 - Test Updates
Name            Stream                Profiles              Summary             
skim            rolling [d]           default [d]           Fuzzy Finder in
Rust          

Hint: [d]efault, [e]nabled, [x]disabled, [i]nstalled

> And per your 2nd comment, I guess this is relevant:
> 
> $ dnf module list | grep '^perl-bootstrap\s'
> perl-bootstrap      5.24                                                    
> Perl bootstrap module for bootrapping Perl module
> perl-bootstrap      5.26                                                    
> Perl bootstrap module for bootrapping Perl module
> 
> Here I have no [d], so is that the problem?
> 
That's as it should look like. No problem.

> > I suspect that you either enabled 5.26 stream by an accident, or set
> > module_hotfixes YUM repository configuration variable
> 
> Those seem quite unlikely -- I manage everything with puppet and only this
> one host is affected.  
>
So do you have more hosts with the same configuration and only one of them
manifests this bug?

> > You can locate a repository the offending packages comes from with "dnf info
> > perl-HTTP-Tiny" commnd and then check the appropriate modular metadata in
> > /var/cache/dnf/*/repodata/*modules.yaml.gz whether the package is listed
> > under data/artifacts/rpms YAML node.
> 
> Hmmm... the query reports "From repo    : local-fedora" which is my config
> to a local mirror.  But I can't chase that further because I see no such
> *modules.yaml.gz for this repo.

Do you I understand correctly, that local-fedora repository contains the
perl-HTTP-Tiny-0.076-1.module_2073+eebc5b71.noarch.rpm package, but does not
have any modular metadata? 

That could be the cause. By default DNF considers all packages as a non-modular
and only those listed in modular metadata as belonging to a module are handled
as modular. If a module is active (i.e. enabled or default and not disabled),
all packages from that module mask all other same-named packages (even
non-modular one). If a module is not active, the packages of that module are
not visible and only non-modular packages are considered.

I assume that "dnf info perl-HTTP-Tiny" shows two packages for you:
perl-HTTP-Tiny-0.076-1.fc29 and perl-HTTP-Tiny-0.076-1.module_2073+eebc5b71.
And because "module_2073+eebc5b71" is lexicographically higher than "fc29", DNF
wants to upgrade perl-HTTP-Tiny to perl-HTTP-Tiny-0.076-1.module_2073+eebc5b71.

> Here's all of them:
> 
> $ sudo find /var/cache/dnf -name '*modules.yaml.gz'
> /var/cache/dnf/fedora-modular-454f0a18da8ca968/repodata/
> 9264d8d10ad5a5def81c888fb16bd7ce6b063a259a03af6eac2953f263078527-modules.
> yaml.gz
> /var/cache/dnf/updates-modular-fb00c2f37a3d46d7/tmpdir.vUVR7v/repodata/
> 31aee6cab351765d685156ff1f8a3d1b09caaa525bbf5e78c0942289d1964a05-modules.
> yaml.gz
> /var/cache/dnf/updates-modular-fb00c2f37a3d46d7/repodata/
> f472f4b1daad95a6583d847e8454567f586b32b12f6c38d69d8873ec9018b02b-modules.
> yaml.gz
> 
Technically DNF somehow merges modular metadata from all repositories, thus DNF
should know that the problematic package is modular by getting the metadata
from fedora-modular repository. But it's possible there is some bug about the
merging in DNF of some of the underlying libraries. I tested my hypothesis by
adding the package into a new repository without modular medata and DNF
recognized the package as a modular.

> So maybe my mirror is bad, but then that seems easily disproved by ignoring
> my mirror (and private repo) to use stock Fedora repos:
> 
> $ sudo dnf upgrade --disablerepo 'local-*' --disablerepo doubledog
> No read/execute access in current directory, moving to /
> Last metadata expiration check: 0:00:46 ago on Fri 01 Nov 2019 09:48:43 AM
> EDT.
> Dependencies resolved.
> 
>  Problem: package perl-HTTP-Tiny-0.076-1.module_2073+eebc5b71.noarch
> requires perl(:MODULE_COMPAT_5.26.2), but none of the providers can be
> installed

How's it possible? If you disable local-fedora repository, the
perl-HTTP-Tiny-0.076-1.module_2073+eebc5b71.noarch should not be available
because you said it comes from local-fedora repository. Where does "dnf
--disablerepo 'local-*' info perl-HTTP-Tiny" find the package?

Provided you do not use any modules, you could disable all modular repositories
(fedora-modular, updates-modular, updates-testing-modular) and try it again if
it helps?
Also try deleting all files in /var/cashe/dnf. Maybe the cache is broken. At
least I saw a spurious tmpdir.vUVR7v subdirectory there.

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