Last week there were several reports about various systems having problems with EPEL-8 repositories. The problems started shortly after various systems in Fedora had been updated from Fedora Linux 38 to Fedora 40, but the problems were not happening to all EL-8 systems. The problems were root-caused to the following:
- Fedora 40 had createrepo-1.0 installed which defaults to using zstd compression for various repositories.
- The EL8 systems which were working had some version of libsolv-0.7.20 installed which links against libzstd and so works.
- The EL8 systems which did not work either had versions of libsolv before 0.7.20 (and were any EL before 8.4) OR they had versions of libsolv-0.7.22.
The newer version of libsolv was traced down to coming from repositories of either Red Hat Satellite or a related tool pulp, and was a rebuild of the EL9 package. However it wasn't a complete rebuild as the EL9 version has libzstd support, but the EL8 rebuild did not.
A band-aid fix was made by Fedora Release Engineering to have EPEL repositories use the xz compression method for various files in /repodata/ versus libzstd. This is a slower compression method, but is possible to be used with all of the versions of libsolv reported in the various bugs and issue trackers.
This is a band-aid fix because users will run into this with any other repositories using the newer createrepo. A fuller fix will require affected systems to do one of the following:
- If the system is either Red Hat Enterprise Linux, Rocky Linux, Alma Linux, or Oracle Enterprise Linux and not running EL-8.9 or later, they need to upgrade to that OR point to an older version of a repository in https://dl.fedoraproject.org/pub/archive/epel/
- If the system has versions of libsolv-0.7.22 without libzstd support, they should contact the repository to see if a rebuild with libzstd support can be made.
- If the system is CentOS Stream 8, then you should be making plans to upgrade to a different operating system as that version will be EOL on May 31st 2024.
External References
- https://issues.redhat.com/browse/RHEL-36078
- https://pagure.io/releng/issue/12097
- https://pagure.io/fedora-infrastructure/issue/11917
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