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# EPEL-8 Packaging Procedures
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## Introduction
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When a new Red Hat Enterprise Linux occurs, one of the steps to get
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EPEL going for it is branching of various packages into new
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namespace. The EPEL Steering Committee does not mass branch all
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existing packages into the namespace because it has caused multiple
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problems:
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1. The package maintainers did not want to support the package in the
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newer version of EPEL. Package maintainers may only want to support
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certain versions of Enterprise Linux or may want to wait until their
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favourite derivative appears.
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2. The package does not work in the latest version of RHEL. With
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multiple years between releases, software which worked on Fedora 18
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which would branch to EPEL-7 may not exist anymore with Fedora 28 and
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EPEL-8 would need a completely different version.
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## Consumer request for packages
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People who are interested in getting packages into EPEL should contact
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the package maintainer through
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[bugzilla](https://bugzilla.redhat.com/). This allows for the requests
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to be tracked and if the primary maintainer is not interested in
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branching to EPEL, other ones can step in and do so.
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## EPEL Next
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EPEL packages are built against RHEL. EPEL Next is an additional repository
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that allows package maintainers to alternatively build against CentOS Stream.
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This is sometimes necessary when CentOS Stream contains an upcoming RHEL
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library rebase, or if an EPEL package has a minimum version build requirement
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that is already in CentOS Stream but not yet in RHEL. EPEL Next has its own
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distgit branches, koji build targets, and bodhi releases.
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EPEL Next packages have `.next` appended to the disttag (e.g. a disttag of
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`.el8.next` for epel8-next) to provide an upgrade path from an EPEL package
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that was built from the same distgit commit. A package maintainer can rebuild
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the same commit for both EPEL and EPEL Next and get two different NVRs in koji.
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Within six months, the build requirement necessitating building in EPEL Next
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should be in RHEL, and at that time the package maintainer can do a normal
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release bump commit in the EPEL branch and get a newer NVR than both the
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previous EPEL and EPEL Next packages.
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To get started with EPEL Next, request the corresponding branch for the EPEL
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release you are targeting, e.g. request an epel8-next branch to rebuild an
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epel8 package against CentOS Stream 8. Once the branch is created you can
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merge commits from other branches and submit a build just like you would for
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other EPEL or Fedora branches.
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## EPEL Playground
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We have added an additional set of channels for EPEL-8 called
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playground. It is meant to be sort of like Fedora Rawhide so that
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packagers can work on versions of software which are too fast moving
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or will have large API changes from what they are putting in the
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regular channel.
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To try and make this transparent, we have made it so when a package is
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built in epel8 it will normally also be built in
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epel8-playground. This is done via a packages.cfg file which lists the
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targets for fedpkg to build against. A successful package build will
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then go through 2 different paths:
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* epel8 package will go into bodhi to be put into epel8-testing
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* epel8-playground will bypass bodhi and go directly into
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epel8-playground the next compose.
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If a packager needs to focus only on epel8 or epel8-playground they
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can edit packages.cfg to change the ```target= epel8
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epel8-playground``` to ```target= epel8 ```.
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Packages in epel8-playground are primarily to be used in the following
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manner:
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* To test out some new version of the package that might not be stable
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yet.
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* To test out some new packaging of the package
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* To test a major version change of the package that they want to land
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at the next epel8 minor release.
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* To build a package that will never be stable enough for epel8, but
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still could be useful to some.
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* At minor RHEL releases (ie, 8.1, 8.2) people can pull in big changes
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from playground to the main epel8 packages. Since people will be
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upgrading and paying more attention than usual anyhow at those
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points, it’s a great chance to do that change, but also you want to
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make sure it’s panned out, so you can test before hand in
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playground.
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Consumers should be aware that packages in EPEL8-playground are there
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without any Service Level Expectations. You may want to only cherry
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pick packages from there as needed.
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## Developer request for branching multiple packages
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Branching is handled the same way as requesting a branch using `fedpkg
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request-branch`. A maintainer can request an epel8 branch using
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`fedpkg request-branch epel8` which will create a ticket in
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https://pagure.io/releng/fedora-scm-requests/issues and Release
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Engineering will process these requests.
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To branch multiple packages please use this or a variant of this
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script:
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```
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#!/usr/bin/sh
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# Reminder to get an updated pagure token for releng tickets
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# Usage: epel-8.sh foo bar goo blah blech
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if [ $# -lt 1 ]
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then
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echo "At least one package name should be provided"
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else
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TMPDIR=`mktemp -d /tmp/epel8.XXXXXX`
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pushd "$TMPDIR"
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for pkg in "$@"
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do
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fedpkg clone "$pkg"
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pushd "$pkg"
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fedpkg request-branch epel8
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fedpkg request-branch epel8-playground
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popd
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done
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rm -rfv "$TMPDIR"
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fi
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```
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Releng will then work through the tickets in the system which is
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adding branches to the PDC and src.fedoraproject.org.
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## Known Issues
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1. /usr/bin/python does not exist. Choose ``/usr/bin/python3`` or
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``/usr/bin/python2`` and patch appropriately.
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2. ``python2-sphinx`` is not shipped. Most packages should work with
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python3-sphinx, and if it doesn't please open a bug. The python team
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has been good about making fixes for this.
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3. When branching python packages, be aware that python in EL-8 is
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python36 and not the version currently in rawhide. This has come up
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with a couple of test packages where they assumed python37 or later.
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4. ``systemd-rpm-macros`` is not a separate packages. If needed, used
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``BuildRequires: systemd``
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5. While EL-8 comes with platform-python, it should NOT be used in
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``Requires:`` unless absolutely neccessary. python3 should be used
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instead. (Exceptions can be made but will be rare and need
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justification.)
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**Accepted Exceptions:**
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* Use python3.6dist(coverage) instead of python3-coverage. This
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package is not shipped but is needed in %check code.
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6. Sometimes RHEL8 only has a python3 package for a dependency you
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need for your build. (Example: python-bleach requires
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python2-html5lib, but RHEL8 provides only python3-html5lib). For
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EPEL-8.0 we only suggest one choice:
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* Choose not to have the python2 part of your package and patch
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whatever to use python3.
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7. Python2 packages are discouraged. RHEL-8 will contain python2.7
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until probably the end of life of RHEL-7. However support upstream
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will only be minimal. When modularity occurs, we suggest that you make
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whatever python2 packages modules which can be pulled out when
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RHEL-8.N no longer has python2.
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8. While a RHEL src.rpm might produce a -devel package, it may not
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currently be in the build repository. When running into this please
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open a ticket with https://pagure.io/epel/new_issue for us to put in a
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request for it to be added to Red Hat's Code Ready Builder. After
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modularity is enabled, changes to what is done will be needed.
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9. EPEL-8.0 may not work with the RHEL-8.1 beta. There seem to be
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changes in dnf and zchunk which we have not worked out. This line will
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be updated.
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## Definitions
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1. Package maintainer. Person who has accepted responsibility to
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package and maintain software in the Fedora Project ecosystem. The
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main packager is usually someone focused on Fedora Linux, and
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secondary packagers may be focused on particular use cases like EPEL.
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2. Consumer. A person who has subscribed to EPEL for packages but is
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not a maintainer.
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3. PDC. Product Definition Center. A tool to help list the lifetime
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and permissions that a product has so that branching and updates can
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be better managed.
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Troy Dawson
Neal Gompa
Carl George