Thanks for considering to help out, your contributions are appreciated!
As you might imagine, only committers are permitted to push changes to the central git repo. As a contributor, we recommend that you fork the apache/isis repo in github, and then use your fork as a way of publishing your patches for the Isis committers to apply.
The diagram below illustrates the process:
upstreamrepo (the Apache github repo) is not the same as the
originrepo (your fork).
The diagram also indicates the JIRA ticket; all work in Isis should tracked in JIRA. Before you decide to start hacking with Isis, it's always worth creating a ticket in JIRA and then have a discussion about it on the mailing lists.
Assuming you have a JIRA ticket, generally speaking all you need to do once you have your patch is to add a comment with the URL to your patch on your github fork; the Isis committer can then download your patch from the JIRA ticket, review it, and apply your patch.
As a slight simplification to the above, you may decide to clone directly from github.com/apache/isis rather than create your own fork:
In this case your
upstream repo is the same as your
origin repo, which might seem more straightforward. On the other hand, if you go this route then you'll need create patches locally and attach them to the JIRA ticket.
For the Isis committers it really doesn't matter which route you take, so go with whatever's most comfortable.
If you choose to create your own fork then you'll need an account on github.com. You then fork simply by pressing the "Fork" button:
An account isn't needed if you just clone straight from the github.com/apache/isis.
Whether you've forked or not, you then need to clone the repo onto your computer. Github makes this very easy to do:
Again, the info is easily found in the github page:
If you've created your own fork, then you need to add the
upstream remote to the github.com/apache/isis. This remote is traditionally called
upstream. You should then arrange for your
master branch to track the
upstream/master remote branch:
git remote add upstream https://github.com/apache/isis.git git pull upstream git branch --set-upstream master upstream/master
If you didn't create your own fork, you can omit the above step. Either way around, you can now fetch new commits using simply:
Although with git your commits are always performed on your local repo, those commit messages become public when the patch is applied by an Isis committer. You should take time to write a meaningful commit message that helps explain what the patch refers to; if you don't then there's a chance that your patch may be rejected and not applied. No-one likes hard work to go to waste!
We therefore recommend that your commit messages are as follows :
ISIS-999: Make the example in CONTRIBUTING imperative and concrete Without this patch applied the example commit message in the CONTRIBUTING document is not a concrete example. This is a problem because the contributor is left to imagine what the commit message should look like based on a description rather than an example. This patch fixes the problem by making the example concrete and imperative. The first line is a real life imperative statement with a ticket number from our issue tracker. The body describes the behavior without the patch, why this is a problem, and how the patch fixes the problem when applied.
Once your git repo is setup, the next thing you'll most likely want to do is to setup your development environment. See here for more details.
If you are working off your own github fork, then you can use github to generate your patch files. Attach them to the relevant JIRA.
If you are working without a github fork, then you can create the patches from your own local git repository.
As per this stackoverflow question, create the patch using
git format-patch -10 HEAD --stdout > 0001-last-10-commits.patch
-10 is the last 10 commits you have done. You need to change that integer according to the commits you need to apply into the patch.
Assuming you're development environment is all setup, let's walk through how you might make contribute a patch. In this example, suppose that you've decided to work on JIRA ticket #123, an enhancement to support Blob/Clob datatypes.
The first thing to do is to make sure your local clone is up-to-date. We do this by retrieving new commits from upstream repo and then merging them as a fast-forward into your local branch.
Irrespective of whether you are using a github fork, the upstream for your local
master branch will be tracking the appropriate remote's
master branch. So n either case, the same commands work:
git checkout master git fetch git merge --ff-only
Alternatively, you can combine the
git fetch and
git merge and just use
git checkout master git pull --ff-only
pull fails, it means that you must have made commits and there have been changes meanwhile on the remote
master's branch. You can use
gitk --all to confirm. If this fails, see our git cookbook page for a procedure to retrospectively sort out this situation.
We recommend you name topic branches by the JIRA ticket, ie ISIS-nnn-description. So let's create a new branch based off
master and call it "ISIS-123-blobs"
git checkout master git checkout -b ISIS-123-blobs
You can confirm the branch is there and is your new
HEAD using either
gitk --all. Alternatively, use the command line:
$ git branch master * ISIS-123-blobs
The command line prompt should also indicate you are on a branch, isolated from any changes that might happen on the
Next, make changes to your files using the usual commands (see also our git cookbook page):
and so on.
Continue this way until happy with the change. Remember to run all your tests on the topic branch (including a full
mvn clean install).
Before you can share your change, you should reintegrate your changes with the
The first thing to do is to pull down any changes made in upstream remote's
master since you started your topic branch:
git checkout master git pull --ff-only
These are the same commands that you would have run before you created your topic branch. If you use
gitk --all, there's a good chance that new commits have come in.
Next, we reintegrate our topic branch by rebasing onto
git checkout ISIS-123-blobs git rebase master
This takes all of the commits in your branch, and applies them on top of the new
master branch. When your change is eventually integrated back in, it will result in a nice clear linear history on the public repo.
If the rebase fails because of a conflict, then you'll be dumped into REBASE mode. Edit the file that has the conflict, and make the appropriate edits. Once done:
git add filename git rebase --continue
Once the rebase has completed, re-run your tests to confirm that everything is still good.
If you have your own fork, you can now simply push the changes you've made locally to your fork:
git checkout ISIS-123-blobs git push -u origin ISIS-123-blobs
This will create a corresponding branch in the remote github repo. If you use
gitk --all, you'll also see a
Then, update your JIRA and add a comment with a URL to this branch.
You can aso use github to raise a pull request. Pull requests sent to the Apache GitHub repositories will forward a pull request e-mail to the dev mailing list; sign up to the dev mailing list first before issuing your pull request.
The process to raise the pull request:
If you decided against having your own github fork, then you'll need to create a patch and then attach to the JIRA. Use
github diff and redirect to a file.
To double check that your pull request is accepted, update your
master branch from the
git checkout master git pull
You can then use
gitk --all (or
git log if you prefer the command line) to check your contribution has been added.
You can now delete your topic branch and remove the branch in your github:
git branch -D ISIS-123-blobs git push origin --delete ISIS-123-blobs
Finally, you might want to push the latest changes in master back up to your github fork. If so, use:
git checkout master git push origin master
If your pull request is rejected, then you'll need to update your branch from the main repository and then address the rejection reason.
git checkout master git pull git checkout ISIS-123-blogs git rebase master
You'll probably also want to remove the remote branch on github:
git push origin --delete ISIS-123-blobs
... and continue as before until you are ready to resubmit your change.
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