Continuous integration branches and jobs


OME uses semantic versioning as defined in Each version number is identified as MAJOR.MINOR.PATCH where MAJOR is the major version number, MINOR the minor version number and PATCH the patch version number. Additional pre-release labels are added as extensions of this version number, e.g. 4.4.0-rc1 or 5.0.0-beta1.

Major release

An increment of the MAJOR version or the MINOR version is typically considered as a major release in OME, e.g. 5.0.0 or 5.1.0.

Point release (patch release)

An increment of the PATCH version is called a point (or patch) release in OME, e.g. 4.4.9.

Development branches

Most of the OME code is split between four repositories: openmicroscopy.git, bioformats.git, scripts.git, ome-documentation.git. Each repository contains several development branches associated with development series:

  • The “dev_5_y” branch(es) containing work on the current 5.y.x series.

  • The “develop” branch containing work on the next major release series.

Note that only two branches are usually maintained simultaneously. With this workflow, it is possible to have a point release immediately, while still working on more major releases by ensuring that (nearly) all commits that are applied to dev_5_y are applied to develop in order to prevent regressions.


Labels are applied to PRs on GitHub under the “Issues” tab of each repository.

Each release series consists of PRs labeled according to the release version, which also matches the name of the branch they will be merged into e.g. 5.1.x series PRs will be labeled as “dev_5_1” and be merged into the dev_5_1 branch.

Multiple labels are used in the PR reviewing process:

  • the “include” label allows you to include a PR opened by a non-member of the OME organization in the merge builds for review.

  • the “exclude” label allows you to exclude a PR opened by any user from the merge builds.

  • the “on hold” label allows you to signal that a PR should not be reviewed or merged, even though it is not excluded.

Job names

All core OME job names take the form COMPONENT-VERSION-TYPE-DESCRIPTION, where:

  • COMPONENT refers to the core OME component, e.g. OMERO for OMERO or BIOFORMATS for Bio-Formats.

  • VERSION is the MAJOR.MINOR version, e.g. 5.0 or 5.1.

  • TYPE represents the source of the job and can take the following values:

    • latest: build from the tip of the development branch, e.g. origin/dev_5_0;

    • merge: build from the tip of the development branch with all PRs merged using scc merge with the org default filter set;

    • release: build from and optionally create a tag at the tip of a development branch, e.g. v5.0.1-rc4.

  • DESCRIPTION describes the job via a set of dash-separated keywords, e.g. docs-autogen.