Contributing to an opensource project might take some time at the beginning, the good thing with OpenStack is that there are lot of guides on how to start and collaborate.
What I did is to look for a bug in the project tagged as low-hanging-fruit, this allows to browse a large list of bugs that are classified as
easy, so they are the best place for new starters to get familiar with the workflow.
I did found an issue with
weight which is supposed to be an integer, that was doing a conversion from float to integer (0.1 -> 0) which was considered invalid, and instead an error should be returned.
When I checked the
Neutron-LBaaS I found out where the problem was, as the value provided, was being converted to integer instead of validating it.
Before contributing you need to:
- create a Launchpad account,
- join the OpenStack Foundation account as ‘Foundation Member’ and
- setup a https://review.openstack.org/ account as described on Account Setup section in the Developer’s manual.
- Don’t bypass the
gitconfiguration steps at above guide as we’ll need them for next steps.
Submitting a change is quite easy:
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# Select the project, 'neutron-lbaas' for me each='neutron-lbaas' git clone firstname.lastname@example.org:openstack/$each.git cd $each # This setups git-review, getting required hooks, etc git-review -s # create a new branch so we can keep our changes separate git branch new-branch # Edit files with changes git add $files git commit -m "Descriptive message" # send to upstream for review: git-review
git-review will output an url you can use to preview your change, and the hooks will automatically add a ‘Change-ID’ so subsequent changes are linked to it.
NOTE: full reference is available at the Developer’s Guide
issue started here:
- In order to not require a new function to validate integers, I’ve used the one for
non-negativewhich already does this tests, but one of the reviewers suggested to write a function
- Functions were imported from
neutron-libso I submitted a second change to
- As the change in neutron-lib couldn’t be marked as dependent as
neutron-lbaasuses the build the version already published, I had to define another interim version of the function so that
neutron-lbaascan use it in the meantime and raise another bug, to later remove this interim function once than
neutron-libincludes the validate_integer function
- As part of the comments on
neutron-libreview, it was found that it would be nice to validate values, so after some discussion, I moved to use the internal
- Of course,
validate_valuesis just doing
data in valid_values, so it fails if
valid_valuesare not comparable and doesn’t do conversion of depending on the values itselves, so this spin-off another review for improving the ´validate_values´ function.
At the moment, I’m trying to close the one to neutron-lib to use the function already defined, and have it merged, and then continue with the other steps, like removing the interim function in
neutron-lbaas and work on enhancing
validate_values and close all the dependant launchpad bugs I’ve created for tracking.
My experience so far, is that sometimes it might be a bit difficult, as git-review is a collaborative environment so different opinions are being shared with different approachs and some of them are ‘easier’ and some others ‘pickier’ like having an ‘extra space’, etc.
Of course, all the code is checked by some automation engines when submitted, which validates that the code still builds, no formatting errors, etc but many of them can be executed locally by using
tox, which allows to perform part of the tests like:
tox -e pep8
tox -e py27
tox -e coverage
To respectively, validate pep8 formatting (line length, spaces around operators, docsstrings formatting, etc) and to run another set of tests like the ones you define.
After each set of changes performed to apply the feedback received, ensure to:
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# Add the modified files to a commit git add $files_modified # Create the commit with the changes git commit -m "whatever" # This will show you the last two commits, so you can leave the first one and # on the beginning of the second one, # replace 'pick' for 'f' so the changes are merged with first one without # keeping the commit message git rebase -i HEAD~2 # Fix the commit message if needed (like fixing formatting, # set dependant commits, or bugs it closes, etc) git commit --amend # Submit changes again for review git-review
Also, keep in mind that apart from submitting the code change is important to submit automated validation tests, which can be executed with
tox -e py27 to view that the functions return the values we expect even if the input data is out of what it should be, or like coverage, to validate that the code is covered (check on
tox.ini what is defined).
And last but not least, expect to have lot of comments on more serius changes like changes to stable libs, as lot of reviewers will come to ensure that everything looks good and might even discuss it on the regular meetings to ensure, that a change is a good fit for the product in the proposed approach.