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Semantic Versioning

Details: http://semver.org/, http://apr.apache.org/versioning.html

Versions are denoted using a standard triplet of integers: MAJOR.MINOR.PATCH. The basic intent is that MAJOR versions are incompatible, large-scale upgrades of the API. MINOR versions retain source and binary compatibility with older minor versions, and changes in the PATCH level are perfectly compatible, forwards and backwards.

Patch level changes could also be for correcting incorrect APIs. In this case, the previous patch release may be incompatible, but because of bugs.

Minor versions may introduce new features, but do not alter any of the previous API.

Major versions may introduce new features and change the old API in incompatible ways.

Git workflow

Details: http://nvie.com/archives/323/ Helpful scripts: http://github.com/zaach/gitflow

The different types of branches we may use are:

  • master

    • production releases
  • develop

    • AKA integration branch
  • Release branches (release-*)

    • for finalizing a major/minor release, branched from develop
  • Hotfix branches (hotfix-*)

    • for applying patches, branched from master (or support-* for older releases)
  • Support branches (support-*)

    • for applying patches to old release versions, branched from master
  • Feature branches (named anything else)

    • for developing features, branched from develop

Feature branches

Created for long running feature development. May make occasional merges from develop to keep it up to date.

May branch off from: develop

$ git checkout -b myfeature develop

Must merge back into: develop

$ git checkout develop
$ git merge --no-ff myfeature
$ git branch -d myfeature
$ git push origin develop

Release branches

Release branches are created when the develop branch is at a stable point and release specific changes need to be made, such as bumping version numbers, etc. At that point, develop should be branched and the changes made before ultimately merging it into master and tagging the release. There should only be one active release branch at a time. Until the current release is wrapped up, merged into master and deleted, development of the next release should take place on develop. When develop reaches another state of stability for release, another release branch is be created.

May branch off from: develop

$ git checkout -b release-1.2 develop
$ ./bump-version.sh 1.2
$ git commit -a -m "Bumped version number to 1.2"

Bug fixes made on a release branch may be merged back into develop continuously if needed, though ultimately they will be merged in when the release is finalized.

Must merge back into: develop and master

$ git checkout master
$ git merge --no-ff release-1.2
$ git tag 1.2

$ git checkout develop
$ git merge --no-ff release-1.2

$ git branch -d release-1.2

Hotfix branches

Patches that need to be made to a production release are applied to a hotfix branch off master. The exception is for old major releases, which have their own "master" branch (support branch, explained later.)

May branch off from: master

$ git checkout -b hotfix-1.2.1 master
$ ./bump-version.sh 1.2.1
$ git commit -a -m "Bumped version number to 1.2.1"

$ git commit -m "Fixed severe production problem"

Must merge back into: develop and master

$ git checkout master
$ git merge --no-ff hotfix-1.2.1
$ git tag 1.2.1

Merge into develop only if there is no current release branch, otherwise, merge into release branch instead.

$ git checkout develop
$ git merge --no-ff hotfix-1.2.1

Finally, delete. $ git branch -d hotfix-1.2.1

Support branches

If master has moved on a point release (1.0, 1.1, 2.0, etc) and a hotfix must be applied to a older version ( e.g 1.x):

* create a support-1.x branch (if none exists) based on the newest 1.x tag in master
* create a branch (e.g. hotfix-1.1.1), based on support-1.x
* fix the bug and merge hotfix-1.1.1 back into support-1.x
* Do this for other older major releases as well

The support branch effectively becomes a master branch for a past version.

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