What is Merged Where and When?

Commits are merged into branches according to criteria that change during the lifecycle of a Ceph release. This chapter is the inventory of what can be merged in which branch at a given point in time.

Development releases (i.e. x.0.z)

What ?

  • features

  • bug fixes

Where ?

Features are merged to the master branch. Bug fixes should be merged to the corresponding named branch (e.g. “jewel” for 10.0.z, “kraken” for 11.0.z, etc.). However, this is not mandatory - bug fixes can be merged to the master branch as well, since the master branch is periodically merged to the named branch during the development releases phase. In either case, if the bugfix is important it can also be flagged for backport to one or more previous stable releases.

When ?

After the stable release candidates of the previous release enters phase 2 (see below). For example: the “jewel” named branch was created when the infernalis release candidates entered phase 2. From this point on, master was no longer associated with infernalis. As soon as the named branch of the next stable release is created, master starts getting periodically merged into it.

Branch merges

  • The branch of the stable release is merged periodically into master.

  • The master branch is merged periodically into the branch of the stable release.

  • The master is merged into the branch of the stable release immediately after each development x.0.z release.

Stable release candidates (i.e. x.1.z) phase 1

What ?

  • bug fixes only

Where ?

The branch of the stable release (e.g. “jewel” for 10.0.z, “kraken” for 11.0.z, etc.) or master. Bug fixes should be merged to the named branch corresponding to the stable release candidate (e.g. “jewel” for 10.1.z) or to master. During this phase, all commits to master will be merged to the named branch, and vice versa. In other words, it makes no difference whether a commit is merged to the named branch or to master - it will make it into the next release candidate either way.

When ?

After the first stable release candidate is published, i.e. after the x.1.0 tag is set in the release branch.

Branch merges

  • The branch of the stable release is merged periodically into master.

  • The master branch is merged periodically into the branch of the stable release.

  • The master is merged into the branch of the stable release immediately after each x.1.z release candidate.

Stable release candidates (i.e. x.1.z) phase 2

What ?

  • bug fixes only

Where ?

The branch of the stable release (e.g. “jewel” for 10.0.z, “kraken” for 11.0.z, etc.). During this phase, all commits to the named branch will be merged into master. Cherry-picking to the named branch during release candidate phase 2 is done manually since the official backporting process only begins when the release is pronounced “stable”.

When ?

After Sage Weil decides it is time for phase 2 to happen.

Branch merges

  • The branch of the stable release is merged periodically into master.

Stable releases (i.e. x.2.z)

What ?

  • bug fixes

  • features are sometime accepted

  • commits should be cherry-picked from master when possible

  • commits that are not cherry-picked from master must be about a bug unique to the stable release

  • see also the backport HOWTO

Where ?

The branch of the stable release (hammer for 0.94.x, infernalis for 9.2.x, etc.)

When ?

After the stable release is published, i.e. after the “vx.2.0” tag is set in the release branch.

Branch merges

Never