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How to Submit Patches to the libseccomp Project
===============================================================================
https://github.com/seccomp/libseccomp

This document is intended to act as a guide to help you contribute to the
libseccomp project.  It is not perfect, and there will always be exceptions
to the rules described here, but by following the instructions below you
should have a much easier time getting your work merged with the upstream
project.

## Test Your Code Using Existing Tests

There are three possible tests you can run to verify your code.  The first
test is used to check the formatting and coding style of your changes, you
can run the test with the following command:

	# make check-syntax

... if there are any problems with your changes a diff/patch will be shown
which indicates the problems and how to fix them.

The second possible test is used to ensure that the different internal syscall
tables are consistent and to test your changes against the automated test
suite.  You can run the test with the following command:

	# make check

... if there are any faults or errors they will be displayed; beware that the
tests can run for some time and produce a lot of output.

The third possible test is used to validate libseccomp against a live, running
system using some simple regression tests.  After ensuring that your system
supports seccomp filters you can run the live tests with the following
command:

	# make check-build
	# (cd tests; ./regression -T live)

... if there are any faults or errors they will be displayed.

## Add New Tests for New Functionality

The libseccomp code includes a fairly extensive test suite and any submissions
which add functionality, or significantly change the existing code, should
include additional tests to verify the proper operation of the proposed
changes.

Code coverage analysis tools have been integrated into the libseccomp code
base, and can be enabled via the "--enable-code-coverage" configure flag and
the "check-code-coverage" make target.  Additional details on generating code
coverage information can be found in the .travis.yml file.

## Explain Your Work

At the top of every patch you should include a description of the problem you
are trying to solve, how you solved it, and why you chose the solution you
implemented.  If you are submitting a bug fix, it is also incredibly helpful
if you can describe/include a reproducer for the problem in the description as
well as instructions on how to test for the bug and verify that it has been
fixed.

## Sign Your Work

The sign-off is a simple line at the end of the patch description, which
certifies that you wrote it or otherwise have the right to pass it on as an
open-source patch.  The "Developer's Certificate of Origin" pledge is taken
from the Linux Kernel and the rules are pretty simple:

	Developer's Certificate of Origin 1.1

	By making a contribution to this project, I certify that:

	(a) The contribution was created in whole or in part by me and I
	    have the right to submit it under the open source license
	    indicated in the file; or

	(b) The contribution is based upon previous work that, to the best
	    of my knowledge, is covered under an appropriate open source
	    license and I have the right under that license to submit that
	    work with modifications, whether created in whole or in part
	    by me, under the same open source license (unless I am
	    permitted to submit under a different license), as indicated
	    in the file; or

	(c) The contribution was provided directly to me by some other
	    person who certified (a), (b) or (c) and I have not modified
	    it.

	(d) I understand and agree that this project and the contribution
	    are public and that a record of the contribution (including all
	    personal information I submit with it, including my sign-off) is
	    maintained indefinitely and may be redistributed consistent with
	    this project or the open source license(s) involved.

... then you just add a line to the bottom of your patch description, with
your real name, saying:

	Signed-off-by: Random J Developer <random@developer.example.org>

You can add this to your commit description in `git` with `git commit -s`

## Post Your Patches Upstream

The libseccomp project accepts both GitHub pull requests and patches sent via
the mailing list.  GitHub pull requests are preferred.  This sections below
explain how to contribute via either method. Please read each step and perform
all steps that apply to your chosen contribution method.

### Submitting via Email

Depending on how you decided to work with the libseccomp code base and what
tools you are using there are different ways to generate your patch(es).
However, regardless of what tools you use, you should always generate your
patches using the "unified" diff/patch format and the patches should always
apply to the libseccomp source tree using the following command from the top
directory of the libseccomp sources:

	# patch -p1 < changes.patch

If you are not using git, stacked git (stgit), or some other tool which can
generate patch files for you automatically, you may find the following command
helpful in generating patches, where "libseccomp.orig/" is the unmodified
source code directory and "libseccomp/" is the source code directory with your
changes:

	# diff -purN libseccomp.orig/ libseccomp/

When in doubt please generate your patch and try applying it to an unmodified
copy of the libseccomp sources; if it fails for you, it will fail for the rest
of us.

Finally, you will need to email your patches to the mailing list so they can
be reviewed and potentially merged into the main libseccomp repository.  When
sending patches to the mailing list it is important to send your email in text
form, no HTML mail please, and ensure that your email client does not mangle
your patches.  It should be possible to save your raw email to disk and apply
it directly to the libseccomp source code; if that fails then you likely have
a problem with your email client.  When in doubt try a test first by sending
yourself an email with your patch and attempting to apply the emailed patch to
the libseccomp repository; if it fails for you, it will fail for the rest of
us trying to test your patch and include it in the main libseccomp repository.

### Submitting via GitHub

See [this guide](https://help.github.com/en/github/collaborating-with-issues-and-pull-requests/creating-a-pull-request) if you've never done this before.