File: SubmittingPatches

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How to contribute a patch to libssh
====================================

Please checkout the libssh source code using git. Change the code and then
use  "git format-patch" to create a patch. The patch should be signed (see
below) and send it to libssh@libssh.org, or attach it to a bug report at
https://red.libssh.org/

For larger code changes, breaking the changes up into a set of simple
patches, each of which does a single thing, are much easier to review.
Patch sets like that will most likely have an easier time being merged
into the libssh code than large single patches that make lots of
changes in one large diff.

Ownership of the contributed code
==================================

libssh is a project with distributed copyright ownership, which means
we prefer the copyright on parts of libssh to be held by individuals
rather than corporations if possible. There are historical legal
reasons for this, but one of the best ways to explain it is that it's
much easier to work with individuals who have ownership than corporate
legal departments if we ever need to make reasonable compromises with
people using and working with libssh.

We track the ownership of every part of libssh via https://git.libssh.org,
our source code control system, so we know the provenance of every piece
of code that is committed to libssh.

So if possible, if you're doing libssh changes on behalf of a company
who normally owns all the work you do please get them to assign
personal copyright ownership of your changes to you as an individual,
that makes things very easy for us to work with and avoids bringing
corporate legal departments into the picture.

If you can't do this we can still accept patches from you owned by
your employer under a standard employment contract with corporate
copyright ownership. It just requires a simple set-up process first.

We use a process very similar to the way things are done in the Linux
Kernel community, so it should be very easy to get a sign off from
your corporate legal department. The only changes we've made are to
accommodate the license we use, which is LGPLv2 (or later) whereas the
Linux kernel uses GPLv2.

The process is called signing.

How to sign your work
----------------------

Once you have permission to contribute to libssh from your employer, simply
email a copy of the following text from your corporate email address to:

contributing@libssh.org



libssh Developer's Certificate of Origin. Version 1.0


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 appropriate
    version of the GNU General Public License; 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 GNU General Public License, in the appropriate version; or

(c) The contribution was provided directly to me by some other
    person who certified (a) or (b) 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
    metadata and personal information I submit with it, including my
    sign-off) is maintained indefinitely and may be redistributed
    consistent with the libssh Team's policies and the requirements of
    the GNU GPL where they are relevant.

(e) I am granting this work to this project under the terms of the
    GNU Lesser General Public License as published by the
    Free Software Foundation; either version 2.1 of
    the License, or (at the option of the project) any later version.

    https://www.gnu.org/licenses/lgpl-2.1.html


We will maintain a copy of that email as a record that you have the
rights to contribute code to libssh under the required licenses whilst
working for the company where the email came from.

Then when sending in a patch via the normal mechanisms described
above, add a line that states:

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

using your real name and the email address you sent the original email
you used to send the libssh Developer's Certificate of Origin to us
(sorry, no pseudonyms or anonymous contributions.)

That's it! Such code can then quite happily contain changes that have
copyright messages such as:

   (c) Example Corporation.

and can be merged into the libssh codebase in the same way as patches
from any other individual. You don't need to send in a copy of the
libssh Developer's Certificate of Origin for each patch, or inside each
patch. Just the sign-off message is all that is required once we've
received the initial email.

Have fun and happy libssh hacking !

The libssh Team