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Editing: DEVELOPERS.md
# Distributed Source Control Management Unlike SVN, git does not used a central repository. This is why git is "distributed" and SVN is "centralized". Although this makes git an extremely powerful system for collaborators, tracking changes between various collaborators can quickly become difficult as multiple forks are created. Please read the following before working with this code: 1. [Dealing with newlines](http://github.com/guides/dealing-with-newlines-in-git) 2. [Submitting changes from your fork](http://github.com/guides/fork-a-project-and-submit-your-modifications) 3. [Using SSH keys with github](http://github.com/guides/how-to-not-have-to-type-your-password-for-every-push) ## Managing Remote Repositories First, you will need to tell git about the remote repository: > git remote add kohana git://github.com/kohana/kohana.git This tells git about the kohana repository and gives it a name which we can use to refer to it when fetching changes from the repository. ## Developing locally There are 3 branches in the kohana/kohana repository: * **master** This branch always points to the latest release tag. In essence it points to the last stable edition of the codebase * **3.0.x** This is a release branch for development of the 3.0.x series, i.e. 3.0, 3.0.3, 3.0.8 etc. * **3.1.x** This is a release branch for development of the 3.1.x series, i.e. 3.1, 3.1.4, 3.1.14 etc. To work on a specific release branch you need to check it out then check out the appropriate system branch. Release branch names follow the same convention in both kohana/kohana and kohana/core. To work on 3.0.x you'd do the following: > git clone git://github.com/kohana/kohana.git # .... > cd kohana > git submodule update --init # .... > git checkout 3.0.x # Switched to branch '3.0.x' > cd system > git checkout 3.0.x # Switched to branch 3.0.x It's important that you follow the last step, because unlike svn, git submodules point at a specific commit rather than the tip of a branch. If you cd into the system folder after a `git submodule update` and run `git status` you'll be told: # Not currently on any branch. nothing to commit (working directory clean) **IMPORTANT:** It is highly recommended that you run the unit tests whilst developing to ensure that any changes you make do not break the api. *See TESTING.md for more info* ### Creating new features New features or API breaking modifications should be developed in separate branches so as to isolate them until they're stable and **tests have been written for the feature**. The naming convention for feature branches is: feature/{issue number}-{short hyphenated description} // i.e. feature/4045-rewriting-config-system When a new feature is complete and tested it can be merged into its respective release branch using `git pull --no-ff`. The `--no-ff` switch is important as it tells git to always create a commit detailing what branch you're merging from. This makes it a lot easier to analyse a feature's history. Here's a quick example: > git status # On branch feature/4045-rewriting-everything > git checkout 3.1.x # Switched to branch '3.1.x' > git merge --no-ff feature/4045-rewriting-everything **If a change you make intentionally breaks the api then please correct the relevant tests before pushing!** ### Bug fixing If you're making a bugfix then before you start create a unit test which reproduces the bug, using the `@ticket` notation in the test to reference the bug's issue number (i.e. `@ticket 4045` for issue #4045). If you run the test then the one you've just made should fail. Once you've written the bugfix, run the tests again before you commit to make sure that the fix actually works,then commiti both the fix and the test. There is no need to create separate branches for bugfixes, creating them in the main release branch is perfectly acceptable. ## Merging Changes from Remote Repositories Now that you have a remote repository, you can pull changes in the remote "kohana" repository into your local repository: > git pull kohana master **Note:** Before you pull changes you should make sure that any modifications you've made locally have been committed. Sometimes a commit you've made locally will conflict with one made in the "kohana" one. There are a couple of scenarios where this might happen: ### The conflict is to do with a few unrelated commits and you want to keep changes made in both commits You'll need to manually modify the files to resolve the conflict, see the "Resolving a merge" section [in the git-scm book](http://book.git-scm.com/3_basic_branching_and_merging.html) for more info ### You've fixed something locally which someone else has already done in the remote repo The simplest way to fix this is to remove all the changes that you've made locally. You can do this using > git reset --hard kohana ### You've fixed something locally which someone else has already fixed but you also have separate commits you'd like to keep If this is the case then you'll want to use a tool called rebase. First of all we need to get rid of the conflicts created due to the merge: > git reset --hard HEAD Then find the hash of the offending local commit and run: > git rebase -i {offending commit hash} i.e. > git rebase -i 57d0b28 A text editor will open with a list of commits, delete the line containing the offending commit before saving the file & closing your editor. Git will remove the commit and you can then pull/merge the remote changes.
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