Phases

Each invocation of pungi-koji consists of a set of phases.

Most of the phases run sequentially (left-to-right in the diagram), but there are use cases where multiple phases run in parallel. This happens for phases whose main point is to wait for a Koji task to finish.

Init

The first phase to ever run. Can not be skipped. It prepares the comps files for variants (by filtering out groups and packages that should not be there). See Processing comps files for details about how this is done.

Pkgset

This phase loads a set of packages that should be composed. It has two separate results: it prepares repos with packages in work/ directory (one per arch) for further processing, and it returns a data structure with mapping of packages to architectures.

Buildinstall

Spawns a bunch of threads, each of which runs the lorax command. The commands create boot.iso and other boot configuration files. The image is finally linked into the compose/ directory as netinstall media.

The created images are also needed for creating live media or other images in later phases.

With lorax this phase runs one task per variant.arch combination.

Gather

This phase uses data collected by pkgset phase and figures out what packages should be in each variant. The basic mapping can come from comps file, a JSON mapping or additional_packages config option. This inputs can then be enriched by adding all dependencies. See Gathering packages for details.

Once the mapping is finalized, the packages are linked to appropriate places and the rpms.json manifest is created.

ExtraFiles

This phase collects extra files from the configuration and copies them to the compose directory. The files are described by a JSON file in the compose subtree where the files are copied. This metadata is meant to be distributed with the data (on ISO images).

Createrepo

This phase creates RPM repositories for each variant.arch tree. It is actually reading the rpms.json manifest to figure out which packages should be included.

OSTree

Updates an ostree repository with a new commit with packages from the compose. The repository lives outside of the compose and is updated immediately. If the compose fails in a later stage, the commit will not be reverted.

Implementation wise, this phase runs rpm-ostree command in Koji runroot (to allow running on different arches).

Createiso

Generates ISO files and accumulates enough metadata to be able to create image.json manifest. The file is however not created in this phase, instead it is dumped in the pungi-koji script itself.

The files include a repository with all RPMs from the variant. There will be multiple images if the packages do not fit on a single image.

The image will be bootable if buildinstall phase is enabled and the packages fit on a single image.

There can also be images with source repositories. These are never bootable.

ExtraIsos

This phase is very similar to createiso, except it combines content from multiple variants onto a single image. Packages, repodata and extra files from each configured variant are put into a subdirectory. Additional extra files can be put into top level of the image. The image will be bootable if the main variant is bootable.

LiveImages, LiveMedia

Creates media in Koji with koji spin-livecd, koji spin-appliance or koji spin-livemedia command. When the media are finished, the images are copied into the compose/ directory and metadata for images is updated.

ImageBuild

This phase wraps up koji image-build. It also updates the metadata ultimately responsible for images.json manifest.

KiwiBuild

Similarly to image build, this phases creates a koji kiwiBuild task. In the background it uses Kiwi to create images.

OSBuild

Similarly to image build, this phases creates a koji osbuild task. In the background it uses OSBuild Composer to create images.

OSBS

This phase builds container base images in OSBS.

The finished images are available in registry provided by OSBS, but not downloaded directly into the compose. The is metadata about the created image in compose/metadata/osbs.json.

ImageContainer

This phase builds a container image in OSBS, and stores the metadata in the same file as OSBS phase. The container produced here wraps a different image, created it ImageBuild or OSBuild phase. It can be useful to deliver a VM image to containerized environments.

OSTreeInstaller

Creates bootable media that carry an ostree repository as a payload. These images are created by running lorax with special templates. Again it runs in Koji runroot.

Repoclosure

Run repoclosure on each repository. By default errors are only reported in the log, the compose will still be considered a success. The actual error has to be looked up in the compose logs directory. Configuration allows customizing this.

ImageChecksum

Responsible for generating checksums for the images. The checksums are stored in image manifest as well as files on disk. The list of images to be processed is obtained from the image manifest. This way all images will get the same checksums irrespective of the phase that created them.

Test

This phase is supposed to run some sanity checks on the finished compose.

The only test is to check all images listed the metadata and verify that they look sane. For ISO files headers are checked to verify the format is correct, and for bootable media a check is run to verify they have properties that allow booting.